lib/socket_wrapper/socket_wrapper.c

   1 /*
   2  * Copyright (c) 2005-2008 Jelmer Vernooij <jelmer@samba.org>
   3  * Copyright (C) 2006-2014 Stefan Metzmacher <metze@samba.org>
   4  * Copyright (C) 2013-2014 Andreas Schneider <asn@samba.org>
   5  *
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the author nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  *
  35  */
  36
  37 /*
  38    Socket wrapper library. Passes all socket communication over
  39    unix domain sockets if the environment variable SOCKET_WRAPPER_DIR
  40    is set.
  41 */
  42
  43 #include "config.h"
  44
  45 #include <sys/types.h>
  46 #include <sys/time.h>
  47 #include <sys/stat.h>
  48 #include <sys/socket.h>
  49 #include <sys/ioctl.h>
  50 #ifdef HAVE_SYS_FILIO_H
  51 #include <sys/filio.h>
  52 #endif
  53 #ifdef HAVE_SYS_SIGNALFD_H
  54 #include <sys/signalfd.h>
  55 #endif
  56 #ifdef HAVE_SYS_EVENTFD_H
  57 #include <sys/eventfd.h>
  58 #endif
  59 #ifdef HAVE_SYS_TIMERFD_H
  60 #include <sys/timerfd.h>
  61 #endif
  62 #include <sys/uio.h>
  63 #include <errno.h>
  64 #include <sys/un.h>
  65 #include <netinet/in.h>
  66 #include <netinet/tcp.h>
  67 #include <arpa/inet.h>
  68 #include <fcntl.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <stdio.h>
  72 #include <stdint.h>
  73 #include <stdarg.h>
  74 #include <stdbool.h>
  75 #include <unistd.h>
  76 #ifdef HAVE_GNU_LIB_NAMES_H
  77 #include <gnu/lib-names.h>
  78 #endif
  79 #ifdef HAVE_RPC_RPC_H
  80 #include <rpc/rpc.h>
  81 #endif
  82
  83 enum swrap_dbglvl_e {
  84         SWRAP_LOG_ERROR = 0,
  85         SWRAP_LOG_WARN,
  86         SWRAP_LOG_DEBUG,
  87         SWRAP_LOG_TRACE
  88 };
  89
  90 /* GCC have printf type attribute check. */
  91 #ifdef HAVE_FUNCTION_ATTRIBUTE_FORMAT
  92 #define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
  93 #else
  94 #define PRINTF_ATTRIBUTE(a,b)
  95 #endif /* HAVE_FUNCTION_ATTRIBUTE_FORMAT */
  96
  97 #ifdef HAVE_DESTRUCTOR_ATTRIBUTE
  98 #define DESTRUCTOR_ATTRIBUTE __attribute__ ((destructor))
  99 #else
 100 #define DESTRUCTOR_ATTRIBUTE
 101 #endif
 102
 103 #ifdef HAVE_ADDRESS_SANITIZER_ATTRIBUTE
 104 #define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE __attribute__((no_sanitize_address))
 105 #else
 106 #define DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
 107 #endif
 108
 109 #ifdef HAVE_GCC_THREAD_LOCAL_STORAGE
 110 # define SWRAP_THREAD __thread
 111 #else
 112 # define SWRAP_THREAD
 113 #endif
 114
 115 #ifndef MIN
 116 #define MIN(a,b) ((a)<(b)?(a):(b))
 117 #endif
 118
 119 #ifndef ZERO_STRUCT
 120 #define ZERO_STRUCT(x) memset((char *)&(x), 0, sizeof(x))
 121 #endif
 122
 123 #ifndef ZERO_STRUCTP
 124 #define ZERO_STRUCTP(x) do { \
 125                 if ((x) != NULL) \
 126                         memset((char *)(x), 0, sizeof(*(x))); \
 127         } while(0)
 128 #endif
 129
 130 #ifndef discard_const
 131 #define discard_const(ptr) ((void *)((uintptr_t)(ptr)))
 132 #endif
 133
 134 #ifndef discard_const_p
 135 #define discard_const_p(type, ptr) ((type *)discard_const(ptr))
 136 #endif
 137
 138 #ifdef IPV6_PKTINFO
 139 # ifndef IPV6_RECVPKTINFO
 140 #  define IPV6_RECVPKTINFO IPV6_PKTINFO
 141 # endif /* IPV6_RECVPKTINFO */
 142 #endif /* IPV6_PKTINFO */
 143
 144 /*
 145  * On BSD IP_PKTINFO has a different name because during
 146  * the time when they implemented it, there was no RFC.
 147  * The name for IPv6 is the same as on Linux.
 148  */
 149 #ifndef IP_PKTINFO
 150 # ifdef IP_RECVDSTADDR
 151 #  define IP_PKTINFO IP_RECVDSTADDR
 152 # endif
 153 #endif
 154
 155
 156 #define SWRAP_DLIST_ADD(list,item) do { \
 157         if (!(list)) { \
 158                 (item)->prev    = NULL; \
 159                 (item)->next    = NULL; \
 160                 (list)          = (item); \
 161         } else { \
 162                 (item)->prev    = NULL; \
 163                 (item)->next    = (list); \
 164                 (list)->prev    = (item); \
 165                 (list)          = (item); \
 166         } \
 167 } while (0)
 168
 169 #define SWRAP_DLIST_REMOVE(list,item) do { \
 170         if ((list) == (item)) { \
 171                 (list)          = (item)->next; \
 172                 if (list) { \
 173                         (list)->prev    = NULL; \
 174                 } \
 175         } else { \
 176                 if ((item)->prev) { \
 177                         (item)->prev->next      = (item)->next; \
 178                 } \
 179                 if ((item)->next) { \
 180                         (item)->next->prev      = (item)->prev; \
 181                 } \
 182         } \
 183         (item)->prev    = NULL; \
 184         (item)->next    = NULL; \
 185 } while (0)
 186
 187 #if defined(HAVE_GETTIMEOFDAY_TZ) || defined(HAVE_GETTIMEOFDAY_TZ_VOID)
 188 #define swrapGetTimeOfDay(tval) gettimeofday(tval,NULL)
 189 #else
 190 #define swrapGetTimeOfDay(tval) gettimeofday(tval)
 191 #endif
 192
 193 /* we need to use a very terse format here as IRIX 6.4 silently
 194    truncates names to 16 chars, so if we use a longer name then we
 195    can't tell which port a packet came from with recvfrom()
 196
 197    with this format we have 8 chars left for the directory name
 198 */
 199 #define SOCKET_FORMAT "%c%02X%04X"
 200 #define SOCKET_TYPE_CHAR_TCP            'T'
 201 #define SOCKET_TYPE_CHAR_UDP            'U'
 202 #define SOCKET_TYPE_CHAR_TCP_V6         'X'
 203 #define SOCKET_TYPE_CHAR_UDP_V6         'Y'
 204
 205 /*
 206  * Cut down to 1500 byte packets for stream sockets,
 207  * which makes it easier to format PCAP capture files
 208  * (as the caller will simply continue from here)
 209  */
 210 #define SOCKET_MAX_PACKET 1500
 211
 212 #define SOCKET_MAX_SOCKETS 1024
 213
 214 /* This limit is to avoid broadcast sendto() needing to stat too many
 215  * files.  It may be raised (with a performance cost) to up to 254
 216  * without changing the format above */
 217 #define MAX_WRAPPED_INTERFACES 40
 218
 219 struct swrap_address {
 220         socklen_t sa_socklen;
 221         union {
 222                 struct sockaddr s;
 223                 struct sockaddr_in in;
 224 #ifdef HAVE_IPV6
 225                 struct sockaddr_in6 in6;
 226 #endif
 227                 struct sockaddr_un un;
 228                 struct sockaddr_storage ss;
 229         } sa;
 230 };
 231
 232 struct socket_info_fd {
 233         struct socket_info_fd *prev, *next;
 234         int fd;
 235 };
 236
 237 struct socket_info
 238 {
 239         struct socket_info_fd *fds;
 240
 241         int family;
 242         int type;
 243         int protocol;
 244         int bound;
 245         int bcast;
 246         int is_server;
 247         int connected;
 248         int defer_connect;
 249         int pktinfo;
 250
 251         /* The unix path so we can unlink it on close() */
 252         struct sockaddr_un un_addr;
 253
 254         struct swrap_address bindname;
 255         struct swrap_address myname;
 256         struct swrap_address peername;
 257
 258         struct {
 259                 unsigned long pck_snd;
 260                 unsigned long pck_rcv;
 261         } io;
 262
 263         struct socket_info *prev, *next;
 264 };
 265
 266 /*
 267  * File descriptors are shared between threads so we should share socket
 268  * information too.
 269  */
 270 struct socket_info *sockets;
 271
 272 /* Function prototypes */
 273
 274 bool socket_wrapper_enabled(void);
 275 void swrap_destructor(void) DESTRUCTOR_ATTRIBUTE;
 276
 277 #ifdef NDEBUG
 278 # define SWRAP_LOG(...)
 279 #else
 280
 281 static void swrap_log(enum swrap_dbglvl_e dbglvl, const char *func, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
 282 # define SWRAP_LOG(dbglvl, ...) swrap_log((dbglvl), __func__, __VA_ARGS__)
 283
 284 static void swrap_log(enum swrap_dbglvl_e dbglvl,
 285                       const char *func,
 286                       const char *format, ...)
 287 {
 288         char buffer[1024];
 289         va_list va;
 290         const char *d;
 291         unsigned int lvl = 0;
 292
 293         d = getenv("SOCKET_WRAPPER_DEBUGLEVEL");
 294         if (d != NULL) {
 295                 lvl = atoi(d);
 296         }
 297
 298         va_start(va, format);
 299         vsnprintf(buffer, sizeof(buffer), format, va);
 300         va_end(va);
 301
 302         if (lvl >= dbglvl) {
 303                 switch (dbglvl) {
 304                         case SWRAP_LOG_ERROR:
 305                                 fprintf(stderr,
 306                                         "SWRAP_ERROR(%d) - %s: %s\n",
 307                                         (int)getpid(), func, buffer);
 308                                 break;
 309                         case SWRAP_LOG_WARN:
 310                                 fprintf(stderr,
 311                                         "SWRAP_WARN(%d) - %s: %s\n",
 312                                         (int)getpid(), func, buffer);
 313                                 break;
 314                         case SWRAP_LOG_DEBUG:
 315                                 fprintf(stderr,
 316                                         "SWRAP_DEBUG(%d) - %s: %s\n",
 317                                         (int)getpid(), func, buffer);
 318                                 break;
 319                         case SWRAP_LOG_TRACE:
 320                                 fprintf(stderr,
 321                                         "SWRAP_TRACE(%d) - %s: %s\n",
 322                                         (int)getpid(), func, buffer);
 323                                 break;
 324                 }
 325         }
 326 }
 327 #endif
 328
 329 /*********************************************************
 330  * SWRAP LOADING LIBC FUNCTIONS
 331  *********************************************************/
 332
 333 #include <dlfcn.h>
 334
 335 struct swrap_libc_fns {
 336         int (*libc_accept)(int sockfd,
 337                            struct sockaddr *addr,
 338                            socklen_t *addrlen);
 339         int (*libc_bind)(int sockfd,
 340                          const struct sockaddr *addr,
 341                          socklen_t addrlen);
 342         int (*libc_close)(int fd);
 343         int (*libc_connect)(int sockfd,
 344                             const struct sockaddr *addr,
 345                             socklen_t addrlen);
 346         int (*libc_dup)(int fd);
 347         int (*libc_dup2)(int oldfd, int newfd);
 348         int (*libc_fcntl)(int fd, int cmd, ...);
 349         FILE *(*libc_fopen)(const char *name, const char *mode);
 350 #ifdef HAVE_EVENTFD
 351         int (*libc_eventfd)(int count, int flags);
 352 #endif
 353         int (*libc_getpeername)(int sockfd,
 354                                 struct sockaddr *addr,
 355                                 socklen_t *addrlen);
 356         int (*libc_getsockname)(int sockfd,
 357                                 struct sockaddr *addr,
 358                                 socklen_t *addrlen);
 359         int (*libc_getsockopt)(int sockfd,
 360                                int level,
 361                                int optname,
 362                                void *optval,
 363                                socklen_t *optlen);
 364         int (*libc_ioctl)(int d, unsigned long int request, ...);
 365         int (*libc_listen)(int sockfd, int backlog);
 366         int (*libc_open)(const char *pathname, int flags, mode_t mode);
 367         int (*libc_pipe)(int pipefd[2]);
 368         int (*libc_read)(int fd, void *buf, size_t count);
 369         ssize_t (*libc_readv)(int fd, const struct iovec *iov, int iovcnt);
 370         int (*libc_recv)(int sockfd, void *buf, size_t len, int flags);
 371         int (*libc_recvfrom)(int sockfd,
 372                              void *buf,
 373                              size_t len,
 374                              int flags,
 375                              struct sockaddr *src_addr,
 376                              socklen_t *addrlen);
 377         int (*libc_recvmsg)(int sockfd, const struct msghdr *msg, int flags);
 378         int (*libc_send)(int sockfd, const void *buf, size_t len, int flags);
 379         int (*libc_sendmsg)(int sockfd, const struct msghdr *msg, int flags);
 380         int (*libc_sendto)(int sockfd,
 381                            const void *buf,
 382                            size_t len,
 383                            int flags,
 384                            const  struct sockaddr *dst_addr,
 385                            socklen_t addrlen);
 386         int (*libc_setsockopt)(int sockfd,
 387                                int level,
 388                                int optname,
 389                                const void *optval,
 390                                socklen_t optlen);
 391 #ifdef HAVE_SIGNALFD
 392         int (*libc_signalfd)(int fd, const sigset_t *mask, int flags);
 393 #endif
 394         int (*libc_socket)(int domain, int type, int protocol);
 395         int (*libc_socketpair)(int domain, int type, int protocol, int sv[2]);
 396 #ifdef HAVE_TIMERFD_CREATE
 397         int (*libc_timerfd_create)(int clockid, int flags);
 398 #endif
 399         ssize_t (*libc_writev)(int fd, const struct iovec *iov, int iovcnt);
 400 };
 401
 402 struct swrap {
 403         void *libc_handle;
 404         void *libsocket_handle;
 405
 406         bool initialised;
 407         bool enabled;
 408
 409         char *socket_dir;
 410
 411         struct swrap_libc_fns fns;
 412 };
 413
 414 static struct swrap swrap;
 415
 416 /* prototypes */
 417 static const char *socket_wrapper_dir(void);
 418
 419 #define LIBC_NAME "libc.so"
 420
 421 enum swrap_lib {
 422     SWRAP_LIBC,
 423     SWRAP_LIBNSL,
 424     SWRAP_LIBSOCKET,
 425 };
 426
 427 #ifndef NDEBUG
 428 static const char *swrap_str_lib(enum swrap_lib lib)
 429 {
 430         switch (lib) {
 431         case SWRAP_LIBC:
 432                 return "libc";
 433         case SWRAP_LIBNSL:
 434                 return "libnsl";
 435         case SWRAP_LIBSOCKET:
 436                 return "libsocket";
 437         }
 438
 439         /* Compiler would warn us about unhandled enum value if we get here */
 440         return "unknown";
 441 }
 442 #endif
 443
 444 static void *swrap_load_lib_handle(enum swrap_lib lib)
 445 {
 446         int flags = RTLD_LAZY;
 447         void *handle = NULL;
 448         int i;
 449
 450 #ifdef RTLD_DEEPBIND
 451         flags |= RTLD_DEEPBIND;
 452 #endif
 453
 454         switch (lib) {
 455         case SWRAP_LIBNSL:
 456                 /* FALL TROUGH */
 457         case SWRAP_LIBSOCKET:
 458 #ifdef HAVE_LIBSOCKET
 459                 handle = swrap.libsocket_handle;
 460                 if (handle == NULL) {
 461                         for (i = 10; i >= 0; i--) {
 462                                 char soname[256] = {0};
 463
 464                                 snprintf(soname, sizeof(soname), "libsocket.so.%d", i);
 465                                 handle = dlopen(soname, flags);
 466                                 if (handle != NULL) {
 467                                         break;
 468                                 }
 469                         }
 470
 471                         swrap.libsocket_handle = handle;
 472                 }
 473                 break;
 474 #endif
 475                 /* FALL TROUGH */
 476         case SWRAP_LIBC:
 477                 handle = swrap.libc_handle;
 478 #ifdef LIBC_SO
 479                 if (handle == NULL) {
 480                         handle = dlopen(LIBC_SO, flags);
 481
 482                         swrap.libc_handle = handle;
 483                 }
 484 #endif
 485                 if (handle == NULL) {
 486                         for (i = 10; i >= 0; i--) {
 487                                 char soname[256] = {0};
 488
 489                                 snprintf(soname, sizeof(soname), "libc.so.%d", i);
 490                                 handle = dlopen(soname, flags);
 491                                 if (handle != NULL) {
 492                                         break;
 493                                 }
 494                         }
 495
 496                         swrap.libc_handle = handle;
 497                 }
 498                 break;
 499         }
 500
 501         if (handle == NULL) {
 502 #ifdef RTLD_NEXT
 503                 handle = swrap.libc_handle = swrap.libsocket_handle = RTLD_NEXT;
 504 #else
 505                 SWRAP_LOG(SWRAP_LOG_ERROR,
 506                           "Failed to dlopen library: %s\n",
 507                           dlerror());
 508                 exit(-1);
 509 #endif
 510         }
 511
 512         return handle;
 513 }
 514
 515 static void *_swrap_load_lib_function(enum swrap_lib lib, const char *fn_name)
 516 {
 517         void *handle;
 518         void *func;
 519
 520         handle = swrap_load_lib_handle(lib);
 521
 522         func = dlsym(handle, fn_name);
 523         if (func == NULL) {
 524                 SWRAP_LOG(SWRAP_LOG_ERROR,
 525                                 "Failed to find %s: %s\n",
 526                                 fn_name, dlerror());
 527                 exit(-1);
 528         }
 529
 530         SWRAP_LOG(SWRAP_LOG_TRACE,
 531                         "Loaded %s from %s",
 532                         fn_name, swrap_str_lib(lib));
 533         return func;
 534 }
 535
 536 #define swrap_load_lib_function(lib, fn_name) \
 537         if (swrap.fns.libc_##fn_name == NULL) { \
 538                 void *swrap_cast_ptr = _swrap_load_lib_function(lib, #fn_name); \
 539                 *(void **) (&swrap.fns.libc_##fn_name) = \
 540                         swrap_cast_ptr; \
 541         }
 542
 543
 544 /*
 545  * IMPORTANT
 546  *
 547  * Functions especially from libc need to be loaded individually, you can't load
 548  * all at once or gdb will segfault at startup. The same applies to valgrind and
 549  * has probably something todo with with the linker.
 550  * So we need load each function at the point it is called the first time.
 551  */
 552 static int libc_accept(int sockfd, struct sockaddr *addr, socklen_t *addrlen)
 553 {
 554         swrap_load_lib_function(SWRAP_LIBSOCKET, accept);
 555
 556         return swrap.fns.libc_accept(sockfd, addr, addrlen);
 557 }
 558
 559 static int libc_bind(int sockfd,
 560                      const struct sockaddr *addr,
 561                      socklen_t addrlen)
 562 {
 563         swrap_load_lib_function(SWRAP_LIBSOCKET, bind);
 564
 565         return swrap.fns.libc_bind(sockfd, addr, addrlen);
 566 }
 567
 568 static int libc_close(int fd)
 569 {
 570         swrap_load_lib_function(SWRAP_LIBC, close);
 571
 572         return swrap.fns.libc_close(fd);
 573 }
 574
 575 static int libc_connect(int sockfd,
 576                         const struct sockaddr *addr,
 577                         socklen_t addrlen)
 578 {
 579         swrap_load_lib_function(SWRAP_LIBSOCKET, connect);
 580
 581         return swrap.fns.libc_connect(sockfd, addr, addrlen);
 582 }
 583
 584 static int libc_dup(int fd)
 585 {
 586         swrap_load_lib_function(SWRAP_LIBC, dup);
 587
 588         return swrap.fns.libc_dup(fd);
 589 }
 590
 591 static int libc_dup2(int oldfd, int newfd)
 592 {
 593         swrap_load_lib_function(SWRAP_LIBC, dup2);
 594
 595         return swrap.fns.libc_dup2(oldfd, newfd);
 596 }
 597
 598 #ifdef HAVE_EVENTFD
 599 static int libc_eventfd(int count, int flags)
 600 {
 601         swrap_load_lib_function(SWRAP_LIBC, eventfd);
 602
 603         return swrap.fns.libc_eventfd(count, flags);
 604 }
 605 #endif
 606
 607 DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
 608 static int libc_vfcntl(int fd, int cmd, va_list ap)
 609 {
 610         long int args[4];
 611         int rc;
 612         int i;
 613
 614         swrap_load_lib_function(SWRAP_LIBC, fcntl);
 615
 616         for (i = 0; i < 4; i++) {
 617                 args[i] = va_arg(ap, long int);
 618         }
 619
 620         rc = swrap.fns.libc_fcntl(fd,
 621                                   cmd,
 622                                   args[0],
 623                                   args[1],
 624                                   args[2],
 625                                   args[3]);
 626
 627         return rc;
 628 }
 629
 630 static int libc_getpeername(int sockfd,
 631                             struct sockaddr *addr,
 632                             socklen_t *addrlen)
 633 {
 634         swrap_load_lib_function(SWRAP_LIBSOCKET, getpeername);
 635
 636         return swrap.fns.libc_getpeername(sockfd, addr, addrlen);
 637 }
 638
 639 static int libc_getsockname(int sockfd,
 640                             struct sockaddr *addr,
 641                             socklen_t *addrlen)
 642 {
 643         swrap_load_lib_function(SWRAP_LIBSOCKET, getsockname);
 644
 645         return swrap.fns.libc_getsockname(sockfd, addr, addrlen);
 646 }
 647
 648 static int libc_getsockopt(int sockfd,
 649                            int level,
 650                            int optname,
 651                            void *optval,
 652                            socklen_t *optlen)
 653 {
 654         swrap_load_lib_function(SWRAP_LIBSOCKET, getsockopt);
 655
 656         return swrap.fns.libc_getsockopt(sockfd, level, optname, optval, optlen);
 657 }
 658
 659 DO_NOT_SANITIZE_ADDRESS_ATTRIBUTE
 660 static int libc_vioctl(int d, unsigned long int request, va_list ap)
 661 {
 662         long int args[4];
 663         int rc;
 664         int i;
 665
 666         swrap_load_lib_function(SWRAP_LIBC, ioctl);
 667
 668         for (i = 0; i < 4; i++) {
 669                 args[i] = va_arg(ap, long int);
 670         }
 671
 672         rc = swrap.fns.libc_ioctl(d,
 673                                   request,
 674                                   args[0],
 675                                   args[1],
 676                                   args[2],
 677                                   args[3]);
 678
 679         return rc;
 680 }
 681
 682 static int libc_listen(int sockfd, int backlog)
 683 {
 684         swrap_load_lib_function(SWRAP_LIBSOCKET, listen);
 685
 686         return swrap.fns.libc_listen(sockfd, backlog);
 687 }
 688
 689 static FILE *libc_fopen(const char *name, const char *mode)
 690 {
 691         swrap_load_lib_function(SWRAP_LIBC, fopen);
 692
 693         return swrap.fns.libc_fopen(name, mode);
 694 }
 695
 696 static int libc_vopen(const char *pathname, int flags, va_list ap)
 697 {
 698         long int mode = 0;
 699         int fd;
 700
 701         swrap_load_lib_function(SWRAP_LIBC, open);
 702
 703         mode = va_arg(ap, long int);
 704
 705         fd = swrap.fns.libc_open(pathname, flags, (mode_t)mode);
 706
 707         return fd;
 708 }
 709
 710 static int libc_open(const char *pathname, int flags, ...)
 711 {
 712         va_list ap;
 713         int fd;
 714
 715         va_start(ap, flags);
 716         fd = libc_vopen(pathname, flags, ap);
 717         va_end(ap);
 718
 719         return fd;
 720 }
 721
 722 static int libc_pipe(int pipefd[2])
 723 {
 724         swrap_load_lib_function(SWRAP_LIBSOCKET, pipe);
 725
 726         return swrap.fns.libc_pipe(pipefd);
 727 }
 728
 729 static int libc_read(int fd, void *buf, size_t count)
 730 {
 731         swrap_load_lib_function(SWRAP_LIBC, read);
 732
 733         return swrap.fns.libc_read(fd, buf, count);
 734 }
 735
 736 static ssize_t libc_readv(int fd, const struct iovec *iov, int iovcnt)
 737 {
 738         swrap_load_lib_function(SWRAP_LIBSOCKET, readv);
 739
 740         return swrap.fns.libc_readv(fd, iov, iovcnt);
 741 }
 742
 743 static int libc_recv(int sockfd, void *buf, size_t len, int flags)
 744 {
 745         swrap_load_lib_function(SWRAP_LIBSOCKET, recv);
 746
 747         return swrap.fns.libc_recv(sockfd, buf, len, flags);
 748 }
 749
 750 static int libc_recvfrom(int sockfd,
 751                          void *buf,
 752                          size_t len,
 753                          int flags,
 754                          struct sockaddr *src_addr,
 755                          socklen_t *addrlen)
 756 {
 757         swrap_load_lib_function(SWRAP_LIBSOCKET, recvfrom);
 758
 759         return swrap.fns.libc_recvfrom(sockfd, buf, len, flags, src_addr, addrlen);
 760 }
 761
 762 static int libc_recvmsg(int sockfd, struct msghdr *msg, int flags)
 763 {
 764         swrap_load_lib_function(SWRAP_LIBSOCKET, recvmsg);
 765
 766         return swrap.fns.libc_recvmsg(sockfd, msg, flags);
 767 }
 768
 769 static int libc_send(int sockfd, const void *buf, size_t len, int flags)
 770 {
 771         swrap_load_lib_function(SWRAP_LIBSOCKET, send);
 772
 773         return swrap.fns.libc_send(sockfd, buf, len, flags);
 774 }
 775
 776 static int libc_sendmsg(int sockfd, const struct msghdr *msg, int flags)
 777 {
 778         swrap_load_lib_function(SWRAP_LIBSOCKET, sendmsg);
 779
 780         return swrap.fns.libc_sendmsg(sockfd, msg, flags);
 781 }
 782
 783 static int libc_sendto(int sockfd,
 784                        const void *buf,
 785                        size_t len,
 786                        int flags,
 787                        const  struct sockaddr *dst_addr,
 788                        socklen_t addrlen)
 789 {
 790         swrap_load_lib_function(SWRAP_LIBSOCKET, sendto);
 791
 792         return swrap.fns.libc_sendto(sockfd, buf, len, flags, dst_addr, addrlen);
 793 }
 794
 795 static int libc_setsockopt(int sockfd,
 796                            int level,
 797                            int optname,
 798                            const void *optval,
 799                            socklen_t optlen)
 800 {
 801         swrap_load_lib_function(SWRAP_LIBSOCKET, setsockopt);
 802
 803         return swrap.fns.libc_setsockopt(sockfd, level, optname, optval, optlen);
 804 }
 805
 806 #ifdef HAVE_SIGNALFD
 807 static int libc_signalfd(int fd, const sigset_t *mask, int flags)
 808 {
 809         swrap_load_lib_function(SWRAP_LIBSOCKET, signalfd);
 810
 811         return swrap.fns.libc_signalfd(fd, mask, flags);
 812 }
 813 #endif
 814
 815 static int libc_socket(int domain, int type, int protocol)
 816 {
 817         swrap_load_lib_function(SWRAP_LIBSOCKET, socket);
 818
 819         return swrap.fns.libc_socket(domain, type, protocol);
 820 }
 821
 822 static int libc_socketpair(int domain, int type, int protocol, int sv[2])
 823 {
 824         swrap_load_lib_function(SWRAP_LIBSOCKET, socketpair);
 825
 826         return swrap.fns.libc_socketpair(domain, type, protocol, sv);
 827 }
 828
 829 #ifdef HAVE_TIMERFD_CREATE
 830 static int libc_timerfd_create(int clockid, int flags)
 831 {
 832         swrap_load_lib_function(SWRAP_LIBC, timerfd_create);
 833
 834         return swrap.fns.libc_timerfd_create(clockid, flags);
 835 }
 836 #endif
 837
 838 static ssize_t libc_writev(int fd, const struct iovec *iov, int iovcnt)
 839 {
 840         swrap_load_lib_function(SWRAP_LIBSOCKET, writev);
 841
 842         return swrap.fns.libc_writev(fd, iov, iovcnt);
 843 }
 844
 845 /*********************************************************
 846  * SWRAP HELPER FUNCTIONS
 847  *********************************************************/
 848
 849 #ifdef HAVE_IPV6
 850 /*
 851  * FD00::5357:5FXX
 852  */
 853 static const struct in6_addr *swrap_ipv6(void)
 854 {
 855         static struct in6_addr v;
 856         static int initialized;
 857         int ret;
 858
 859         if (initialized) {
 860                 return &v;
 861         }
 862         initialized = 1;
 863
 864         ret = inet_pton(AF_INET6, "FD00::5357:5F00", &v);
 865         if (ret <= 0) {
 866                 abort();
 867         }
 868
 869         return &v;
 870 }
 871 #endif
 872
 873 static void set_port(int family, int prt, struct swrap_address *addr)
 874 {
 875         switch (family) {
 876         case AF_INET:
 877                 addr->sa.in.sin_port = htons(prt);
 878                 break;
 879 #ifdef HAVE_IPV6
 880         case AF_INET6:
 881                 addr->sa.in6.sin6_port = htons(prt);
 882                 break;
 883 #endif
 884         }
 885 }
 886
 887 static size_t socket_length(int family)
 888 {
 889         switch (family) {
 890         case AF_INET:
 891                 return sizeof(struct sockaddr_in);
 892 #ifdef HAVE_IPV6
 893         case AF_INET6:
 894                 return sizeof(struct sockaddr_in6);
 895 #endif
 896         }
 897         return 0;
 898 }
 899
 900 static const char *socket_wrapper_dir(void)
 901 {
 902         const char *s = getenv("SOCKET_WRAPPER_DIR");
 903         if (s == NULL) {
 904                 return NULL;
 905         }
 906         /* TODO use realpath(3) here, when we add support for threads */
 907         if (strncmp(s, "./", 2) == 0) {
 908                 s += 2;
 909         }
 910
 911         SWRAP_LOG(SWRAP_LOG_TRACE, "socket_wrapper_dir: %s", s);
 912         return s;
 913 }
 914
 915 bool socket_wrapper_enabled(void)
 916 {
 917         const char *s = socket_wrapper_dir();
 918
 919         return s != NULL ? true : false;
 920 }
 921
 922 static unsigned int socket_wrapper_default_iface(void)
 923 {
 924         const char *s = getenv("SOCKET_WRAPPER_DEFAULT_IFACE");
 925         if (s) {
 926                 unsigned int iface;
 927                 if (sscanf(s, "%u", &iface) == 1) {
 928                         if (iface >= 1 && iface <= MAX_WRAPPED_INTERFACES) {
 929                                 return iface;
 930                         }
 931                 }
 932         }
 933
 934         return 1;/* 127.0.0.1 */
 935 }
 936
 937 static int convert_un_in(const struct sockaddr_un *un, struct sockaddr *in, socklen_t *len)
 938 {
 939         unsigned int iface;
 940         unsigned int prt;
 941         const char *p;
 942         char type;
 943
 944         p = strrchr(un->sun_path, '/');
 945         if (p) p++; else p = un->sun_path;
 946
 947         if (sscanf(p, SOCKET_FORMAT, &type, &iface, &prt) != 3) {
 948                 errno = EINVAL;
 949                 return -1;
 950         }
 951
 952         SWRAP_LOG(SWRAP_LOG_TRACE, "type %c iface %u port %u",
 953                         type, iface, prt);
 954
 955         if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
 956                 errno = EINVAL;
 957                 return -1;
 958         }
 959
 960         if (prt > 0xFFFF) {
 961                 errno = EINVAL;
 962                 return -1;
 963         }
 964
 965         switch(type) {
 966         case SOCKET_TYPE_CHAR_TCP:
 967         case SOCKET_TYPE_CHAR_UDP: {
 968                 struct sockaddr_in *in2 = (struct sockaddr_in *)(void *)in;
 969
 970                 if ((*len) < sizeof(*in2)) {
 971                     errno = EINVAL;
 972                     return -1;
 973                 }
 974
 975                 memset(in2, 0, sizeof(*in2));
 976                 in2->sin_family = AF_INET;
 977                 in2->sin_addr.s_addr = htonl((127<<24) | iface);
 978                 in2->sin_port = htons(prt);
 979
 980                 *len = sizeof(*in2);
 981                 break;
 982         }
 983 #ifdef HAVE_IPV6
 984         case SOCKET_TYPE_CHAR_TCP_V6:
 985         case SOCKET_TYPE_CHAR_UDP_V6: {
 986                 struct sockaddr_in6 *in2 = (struct sockaddr_in6 *)(void *)in;
 987
 988                 if ((*len) < sizeof(*in2)) {
 989                         errno = EINVAL;
 990                         return -1;
 991                 }
 992
 993                 memset(in2, 0, sizeof(*in2));
 994                 in2->sin6_family = AF_INET6;
 995                 in2->sin6_addr = *swrap_ipv6();
 996                 in2->sin6_addr.s6_addr[15] = iface;
 997                 in2->sin6_port = htons(prt);
 998
 999                 *len = sizeof(*in2);
1000                 break;
1001         }
1002 #endif
1003         default:
1004                 errno = EINVAL;
1005                 return -1;
1006         }
1007
1008         return 0;
1009 }
1010
1011 static int convert_in_un_remote(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
1012                                 int *bcast)
1013 {
1014         char type = '\0';
1015         unsigned int prt;
1016         unsigned int iface;
1017         int is_bcast = 0;
1018
1019         if (bcast) *bcast = 0;
1020
1021         switch (inaddr->sa_family) {
1022         case AF_INET: {
1023                 const struct sockaddr_in *in =
1024                     (const struct sockaddr_in *)(const void *)inaddr;
1025                 unsigned int addr = ntohl(in->sin_addr.s_addr);
1026                 char u_type = '\0';
1027                 char b_type = '\0';
1028                 char a_type = '\0';
1029
1030                 switch (si->type) {
1031                 case SOCK_STREAM:
1032                         u_type = SOCKET_TYPE_CHAR_TCP;
1033                         break;
1034                 case SOCK_DGRAM:
1035                         u_type = SOCKET_TYPE_CHAR_UDP;
1036                         a_type = SOCKET_TYPE_CHAR_UDP;
1037                         b_type = SOCKET_TYPE_CHAR_UDP;
1038                         break;
1039                 default:
1040                         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
1041                         errno = ESOCKTNOSUPPORT;
1042                         return -1;
1043                 }
1044
1045                 prt = ntohs(in->sin_port);
1046                 if (a_type && addr == 0xFFFFFFFF) {
1047                         /* 255.255.255.255 only udp */
1048                         is_bcast = 2;
1049                         type = a_type;
1050                         iface = socket_wrapper_default_iface();
1051                 } else if (b_type && addr == 0x7FFFFFFF) {
1052                         /* 127.255.255.255 only udp */
1053                         is_bcast = 1;
1054                         type = b_type;
1055                         iface = socket_wrapper_default_iface();
1056                 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
1057                         /* 127.0.0.X */
1058                         is_bcast = 0;
1059                         type = u_type;
1060                         iface = (addr & 0x000000FF);
1061                 } else {
1062                         errno = ENETUNREACH;
1063                         return -1;
1064                 }
1065                 if (bcast) *bcast = is_bcast;
1066                 break;
1067         }
1068 #ifdef HAVE_IPV6
1069         case AF_INET6: {
1070                 const struct sockaddr_in6 *in =
1071                     (const struct sockaddr_in6 *)(const void *)inaddr;
1072                 struct in6_addr cmp1, cmp2;
1073
1074                 switch (si->type) {
1075                 case SOCK_STREAM:
1076                         type = SOCKET_TYPE_CHAR_TCP_V6;
1077                         break;
1078                 case SOCK_DGRAM:
1079                         type = SOCKET_TYPE_CHAR_UDP_V6;
1080                         break;
1081                 default:
1082                         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
1083                         errno = ESOCKTNOSUPPORT;
1084                         return -1;
1085                 }
1086
1087                 /* XXX no multicast/broadcast */
1088
1089                 prt = ntohs(in->sin6_port);
1090
1091                 cmp1 = *swrap_ipv6();
1092                 cmp2 = in->sin6_addr;
1093                 cmp2.s6_addr[15] = 0;
1094                 if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
1095                         iface = in->sin6_addr.s6_addr[15];
1096                 } else {
1097                         errno = ENETUNREACH;
1098                         return -1;
1099                 }
1100
1101                 break;
1102         }
1103 #endif
1104         default:
1105                 SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family!\n");
1106                 errno = ENETUNREACH;
1107                 return -1;
1108         }
1109
1110         if (prt == 0) {
1111                 SWRAP_LOG(SWRAP_LOG_WARN, "Port not set\n");
1112                 errno = EINVAL;
1113                 return -1;
1114         }
1115
1116         if (is_bcast) {
1117                 snprintf(un->sun_path, sizeof(un->sun_path), "%s/EINVAL",
1118                          socket_wrapper_dir());
1119                 SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path);
1120                 /* the caller need to do more processing */
1121                 return 0;
1122         }
1123
1124         snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
1125                  socket_wrapper_dir(), type, iface, prt);
1126         SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path);
1127
1128         return 0;
1129 }
1130
1131 static int convert_in_un_alloc(struct socket_info *si, const struct sockaddr *inaddr, struct sockaddr_un *un,
1132                                int *bcast)
1133 {
1134         char type = '\0';
1135         unsigned int prt;
1136         unsigned int iface;
1137         struct stat st;
1138         int is_bcast = 0;
1139
1140         if (bcast) *bcast = 0;
1141
1142         switch (si->family) {
1143         case AF_INET: {
1144                 const struct sockaddr_in *in =
1145                     (const struct sockaddr_in *)(const void *)inaddr;
1146                 unsigned int addr = ntohl(in->sin_addr.s_addr);
1147                 char u_type = '\0';
1148                 char d_type = '\0';
1149                 char b_type = '\0';
1150                 char a_type = '\0';
1151
1152                 prt = ntohs(in->sin_port);
1153
1154                 switch (si->type) {
1155                 case SOCK_STREAM:
1156                         u_type = SOCKET_TYPE_CHAR_TCP;
1157                         d_type = SOCKET_TYPE_CHAR_TCP;
1158                         break;
1159                 case SOCK_DGRAM:
1160                         u_type = SOCKET_TYPE_CHAR_UDP;
1161                         d_type = SOCKET_TYPE_CHAR_UDP;
1162                         a_type = SOCKET_TYPE_CHAR_UDP;
1163                         b_type = SOCKET_TYPE_CHAR_UDP;
1164                         break;
1165                 default:
1166                         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
1167                         errno = ESOCKTNOSUPPORT;
1168                         return -1;
1169                 }
1170
1171                 if (addr == 0) {
1172                         /* 0.0.0.0 */
1173                         is_bcast = 0;
1174                         type = d_type;
1175                         iface = socket_wrapper_default_iface();
1176                 } else if (a_type && addr == 0xFFFFFFFF) {
1177                         /* 255.255.255.255 only udp */
1178                         is_bcast = 2;
1179                         type = a_type;
1180                         iface = socket_wrapper_default_iface();
1181                 } else if (b_type && addr == 0x7FFFFFFF) {
1182                         /* 127.255.255.255 only udp */
1183                         is_bcast = 1;
1184                         type = b_type;
1185                         iface = socket_wrapper_default_iface();
1186                 } else if ((addr & 0xFFFFFF00) == 0x7F000000) {
1187                         /* 127.0.0.X */
1188                         is_bcast = 0;
1189                         type = u_type;
1190                         iface = (addr & 0x000000FF);
1191                 } else {
1192                         errno = EADDRNOTAVAIL;
1193                         return -1;
1194                 }
1195
1196                 /* Store the bind address for connect() */
1197                 if (si->bindname.sa_socklen == 0) {
1198                         struct sockaddr_in bind_in;
1199                         socklen_t blen = sizeof(struct sockaddr_in);
1200
1201                         ZERO_STRUCT(bind_in);
1202                         bind_in.sin_family = in->sin_family;
1203                         bind_in.sin_port = in->sin_port;
1204                         bind_in.sin_addr.s_addr = htonl(0x7F000000 | iface);
1205
1206                         si->bindname.sa_socklen = blen;
1207                         memcpy(&si->bindname.sa.in, &bind_in, blen);
1208                 }
1209
1210                 break;
1211         }
1212 #ifdef HAVE_IPV6
1213         case AF_INET6: {
1214                 const struct sockaddr_in6 *in =
1215                     (const struct sockaddr_in6 *)(const void *)inaddr;
1216                 struct in6_addr cmp1, cmp2;
1217
1218                 switch (si->type) {
1219                 case SOCK_STREAM:
1220                         type = SOCKET_TYPE_CHAR_TCP_V6;
1221                         break;
1222                 case SOCK_DGRAM:
1223                         type = SOCKET_TYPE_CHAR_UDP_V6;
1224                         break;
1225                 default:
1226                         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
1227                         errno = ESOCKTNOSUPPORT;
1228                         return -1;
1229                 }
1230
1231                 /* XXX no multicast/broadcast */
1232
1233                 prt = ntohs(in->sin6_port);
1234
1235                 cmp1 = *swrap_ipv6();
1236                 cmp2 = in->sin6_addr;
1237                 cmp2.s6_addr[15] = 0;
1238                 if (IN6_IS_ADDR_UNSPECIFIED(&in->sin6_addr)) {
1239                         iface = socket_wrapper_default_iface();
1240                 } else if (IN6_ARE_ADDR_EQUAL(&cmp1, &cmp2)) {
1241                         iface = in->sin6_addr.s6_addr[15];
1242                 } else {
1243                         errno = EADDRNOTAVAIL;
1244                         return -1;
1245                 }
1246
1247                 /* Store the bind address for connect() */
1248                 if (si->bindname.sa_socklen == 0) {
1249                         struct sockaddr_in6 bind_in;
1250                         socklen_t blen = sizeof(struct sockaddr_in6);
1251
1252                         ZERO_STRUCT(bind_in);
1253                         bind_in.sin6_family = in->sin6_family;
1254                         bind_in.sin6_port = in->sin6_port;
1255
1256                         bind_in.sin6_addr = *swrap_ipv6();
1257                         bind_in.sin6_addr.s6_addr[15] = iface;
1258
1259                         memcpy(&si->bindname.sa.in6, &bind_in, blen);
1260                         si->bindname.sa_socklen = blen;
1261                 }
1262
1263                 break;
1264         }
1265 #endif
1266         default:
1267                 SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family\n");
1268                 errno = EADDRNOTAVAIL;
1269                 return -1;
1270         }
1271
1272
1273         if (bcast) *bcast = is_bcast;
1274
1275         if (iface == 0 || iface > MAX_WRAPPED_INTERFACES) {
1276                 errno = EINVAL;
1277                 return -1;
1278         }
1279
1280         if (prt == 0) {
1281                 /* handle auto-allocation of ephemeral ports */
1282                 for (prt = 5001; prt < 10000; prt++) {
1283                         snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
1284                                  socket_wrapper_dir(), type, iface, prt);
1285                         if (stat(un->sun_path, &st) == 0) continue;
1286
1287                         set_port(si->family, prt, &si->myname);
1288                         set_port(si->family, prt, &si->bindname);
1289
1290                         break;
1291                 }
1292                 if (prt == 10000) {
1293                         errno = ENFILE;
1294                         return -1;
1295                 }
1296         }
1297
1298         snprintf(un->sun_path, sizeof(un->sun_path), "%s/"SOCKET_FORMAT,
1299                  socket_wrapper_dir(), type, iface, prt);
1300         SWRAP_LOG(SWRAP_LOG_DEBUG, "un path [%s]", un->sun_path);
1301         return 0;
1302 }
1303
1304 static struct socket_info *find_socket_info(int fd)
1305 {
1306         struct socket_info *i;
1307
1308         for (i = sockets; i; i = i->next) {
1309                 struct socket_info_fd *f;
1310                 for (f = i->fds; f; f = f->next) {
1311                         if (f->fd == fd) {
1312                                 return i;
1313                         }
1314                 }
1315         }
1316
1317         return NULL;
1318 }
1319
1320 #if 0 /* FIXME */
1321 static bool check_addr_port_in_use(const struct sockaddr *sa, socklen_t len)
1322 {
1323         struct socket_info *s;
1324
1325         /* first catch invalid input */
1326         switch (sa->sa_family) {
1327         case AF_INET:
1328                 if (len < sizeof(struct sockaddr_in)) {
1329                         return false;
1330                 }
1331                 break;
1332 #if HAVE_IPV6
1333         case AF_INET6:
1334                 if (len < sizeof(struct sockaddr_in6)) {
1335                         return false;
1336                 }
1337                 break;
1338 #endif
1339         default:
1340                 return false;
1341                 break;
1342         }
1343
1344         for (s = sockets; s != NULL; s = s->next) {
1345                 if (s->myname == NULL) {
1346                         continue;
1347                 }
1348                 if (s->myname->sa_family != sa->sa_family) {
1349                         continue;
1350                 }
1351                 switch (s->myname->sa_family) {
1352                 case AF_INET: {
1353                         struct sockaddr_in *sin1, *sin2;
1354
1355                         sin1 = (struct sockaddr_in *)s->myname;
1356                         sin2 = (struct sockaddr_in *)sa;
1357
1358                         if (sin1->sin_addr.s_addr == htonl(INADDR_ANY)) {
1359                                 continue;
1360                         }
1361                         if (sin1->sin_port != sin2->sin_port) {
1362                                 continue;
1363                         }
1364                         if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) {
1365                                 continue;
1366                         }
1367
1368                         /* found */
1369                         return true;
1370                         break;
1371                 }
1372 #if HAVE_IPV6
1373                 case AF_INET6: {
1374                         struct sockaddr_in6 *sin1, *sin2;
1375
1376                         sin1 = (struct sockaddr_in6 *)s->myname;
1377                         sin2 = (struct sockaddr_in6 *)sa;
1378
1379                         if (sin1->sin6_port != sin2->sin6_port) {
1380                                 continue;
1381                         }
1382                         if (!IN6_ARE_ADDR_EQUAL(&sin1->sin6_addr,
1383                                                 &sin2->sin6_addr))
1384                         {
1385                                 continue;
1386                         }
1387
1388                         /* found */
1389                         return true;
1390                         break;
1391                 }
1392 #endif
1393                 default:
1394                         continue;
1395                         break;
1396
1397                 }
1398         }
1399
1400         return false;
1401 }
1402 #endif
1403
1404 static void swrap_remove_stale(int fd)
1405 {
1406         struct socket_info *si = find_socket_info(fd);
1407         struct socket_info_fd *fi;
1408
1409         if (si != NULL) {
1410                 for (fi = si->fds; fi; fi = fi->next) {
1411                         if (fi->fd == fd) {
1412                                 SWRAP_LOG(SWRAP_LOG_TRACE, "remove stale wrapper for %d", fd);
1413                                 SWRAP_DLIST_REMOVE(si->fds, fi);
1414                                 free(fi);
1415                                 break;
1416                         }
1417                 }
1418
1419                 if (si->fds == NULL) {
1420                         SWRAP_DLIST_REMOVE(sockets, si);
1421                         if (si->un_addr.sun_path[0] != '\0') {
1422                                 unlink(si->un_addr.sun_path);
1423                         }
1424                         free(si);
1425                 }
1426         }
1427 }
1428
1429 static int sockaddr_convert_to_un(struct socket_info *si,
1430                                   const struct sockaddr *in_addr,
1431                                   socklen_t in_len,
1432                                   struct sockaddr_un *out_addr,
1433                                   int alloc_sock,
1434                                   int *bcast)
1435 {
1436         struct sockaddr *out = (struct sockaddr *)(void *)out_addr;
1437
1438         (void) in_len; /* unused */
1439
1440         if (out_addr == NULL) {
1441                 return 0;
1442         }
1443
1444         out->sa_family = AF_UNIX;
1445 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1446         out->sa_len = sizeof(*out_addr);
1447 #endif
1448
1449         switch (in_addr->sa_family) {
1450         case AF_UNSPEC: {
1451                 const struct sockaddr_in *sin;
1452                 if (si->family != AF_INET) {
1453                         break;
1454                 }
1455                 if (in_len < sizeof(struct sockaddr_in)) {
1456                         break;
1457                 }
1458                 sin = (const struct sockaddr_in *)(const void *)in_addr;
1459                 if(sin->sin_addr.s_addr != htonl(INADDR_ANY)) {
1460                         break;
1461                 }
1462
1463                 /*
1464                  * Note: in the special case of AF_UNSPEC and INADDR_ANY,
1465                  * AF_UNSPEC is mapped to AF_INET and must be treated here.
1466                  */
1467
1468                 /* FALL THROUGH */
1469         }
1470         case AF_INET:
1471 #ifdef HAVE_IPV6
1472         case AF_INET6:
1473 #endif
1474                 switch (si->type) {
1475                 case SOCK_STREAM:
1476                 case SOCK_DGRAM:
1477                         break;
1478                 default:
1479                         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
1480                         errno = ESOCKTNOSUPPORT;
1481                         return -1;
1482                 }
1483                 if (alloc_sock) {
1484                         return convert_in_un_alloc(si, in_addr, out_addr, bcast);
1485                 } else {
1486                         return convert_in_un_remote(si, in_addr, out_addr, bcast);
1487                 }
1488         default:
1489                 break;
1490         }
1491
1492         errno = EAFNOSUPPORT;
1493         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family\n");
1494         return -1;
1495 }
1496
1497 static int sockaddr_convert_from_un(const struct socket_info *si,
1498                                     const struct sockaddr_un *in_addr,
1499                                     socklen_t un_addrlen,
1500                                     int family,
1501                                     struct sockaddr *out_addr,
1502                                     socklen_t *out_addrlen)
1503 {
1504         int ret;
1505
1506         if (out_addr == NULL || out_addrlen == NULL)
1507                 return 0;
1508
1509         if (un_addrlen == 0) {
1510                 *out_addrlen = 0;
1511                 return 0;
1512         }
1513
1514         switch (family) {
1515         case AF_INET:
1516 #ifdef HAVE_IPV6
1517         case AF_INET6:
1518 #endif
1519                 switch (si->type) {
1520                 case SOCK_STREAM:
1521                 case SOCK_DGRAM:
1522                         break;
1523                 default:
1524                         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown socket type!\n");
1525                         errno = ESOCKTNOSUPPORT;
1526                         return -1;
1527                 }
1528                 ret = convert_un_in(in_addr, out_addr, out_addrlen);
1529 #ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
1530                 out_addr->sa_len = *out_addrlen;
1531 #endif
1532                 return ret;
1533         default:
1534                 break;
1535         }
1536
1537         SWRAP_LOG(SWRAP_LOG_ERROR, "Unknown address family\n");
1538         errno = EAFNOSUPPORT;
1539         return -1;
1540 }
1541
1542 enum swrap_packet_type {
1543         SWRAP_CONNECT_SEND,
1544         SWRAP_CONNECT_UNREACH,
1545         SWRAP_CONNECT_RECV,
1546         SWRAP_CONNECT_ACK,
1547         SWRAP_ACCEPT_SEND,
1548         SWRAP_ACCEPT_RECV,
1549         SWRAP_ACCEPT_ACK,
1550         SWRAP_RECVFROM,
1551         SWRAP_SENDTO,
1552         SWRAP_SENDTO_UNREACH,
1553         SWRAP_PENDING_RST,
1554         SWRAP_RECV,
1555         SWRAP_RECV_RST,
1556         SWRAP_SEND,
1557         SWRAP_SEND_RST,
1558         SWRAP_CLOSE_SEND,
1559         SWRAP_CLOSE_RECV,
1560         SWRAP_CLOSE_ACK,
1561 };
1562
1563 struct swrap_file_hdr {
1564         uint32_t        magic;
1565         uint16_t        version_major;
1566         uint16_t        version_minor;
1567         int32_t         timezone;
1568         uint32_t        sigfigs;
1569         uint32_t        frame_max_len;
1570 #define SWRAP_FRAME_LENGTH_MAX 0xFFFF
1571         uint32_t        link_type;
1572 };
1573 #define SWRAP_FILE_HDR_SIZE 24
1574
1575 struct swrap_packet_frame {
1576         uint32_t seconds;
1577         uint32_t micro_seconds;
1578         uint32_t recorded_length;
1579         uint32_t full_length;
1580 };
1581 #define SWRAP_PACKET_FRAME_SIZE 16
1582
1583 union swrap_packet_ip {
1584         struct {
1585                 uint8_t         ver_hdrlen;
1586                 uint8_t         tos;
1587                 uint16_t        packet_length;
1588                 uint16_t        identification;
1589                 uint8_t         flags;
1590                 uint8_t         fragment;
1591                 uint8_t         ttl;
1592                 uint8_t         protocol;
1593                 uint16_t        hdr_checksum;
1594                 uint32_t        src_addr;
1595                 uint32_t        dest_addr;
1596         } v4;
1597 #define SWRAP_PACKET_IP_V4_SIZE 20
1598         struct {
1599                 uint8_t         ver_prio;
1600                 uint8_t         flow_label_high;
1601                 uint16_t        flow_label_low;
1602                 uint16_t        payload_length;
1603                 uint8_t         next_header;
1604                 uint8_t         hop_limit;
1605                 uint8_t         src_addr[16];
1606                 uint8_t         dest_addr[16];
1607         } v6;
1608 #define SWRAP_PACKET_IP_V6_SIZE 40
1609 };
1610 #define SWRAP_PACKET_IP_SIZE 40
1611
1612 union swrap_packet_payload {
1613         struct {
1614                 uint16_t        source_port;
1615                 uint16_t        dest_port;
1616                 uint32_t        seq_num;
1617                 uint32_t        ack_num;
1618                 uint8_t         hdr_length;
1619                 uint8_t         control;
1620                 uint16_t        window;
1621                 uint16_t        checksum;
1622                 uint16_t        urg;
1623         } tcp;
1624 #define SWRAP_PACKET_PAYLOAD_TCP_SIZE 20
1625         struct {
1626                 uint16_t        source_port;
1627                 uint16_t        dest_port;
1628                 uint16_t        length;
1629                 uint16_t        checksum;
1630         } udp;
1631 #define SWRAP_PACKET_PAYLOAD_UDP_SIZE 8
1632         struct {
1633                 uint8_t         type;
1634                 uint8_t         code;
1635                 uint16_t        checksum;
1636                 uint32_t        unused;
1637         } icmp4;
1638 #define SWRAP_PACKET_PAYLOAD_ICMP4_SIZE 8
1639         struct {
1640                 uint8_t         type;
1641                 uint8_t         code;
1642                 uint16_t        checksum;
1643                 uint32_t        unused;
1644         } icmp6;
1645 #define SWRAP_PACKET_PAYLOAD_ICMP6_SIZE 8
1646 };
1647 #define SWRAP_PACKET_PAYLOAD_SIZE 20
1648
1649 #define SWRAP_PACKET_MIN_ALLOC \
1650         (SWRAP_PACKET_FRAME_SIZE + \
1651          SWRAP_PACKET_IP_SIZE + \
1652          SWRAP_PACKET_PAYLOAD_SIZE)
1653
1654 static const char *swrap_pcap_init_file(void)
1655 {
1656         static int initialized = 0;
1657         static const char *s = NULL;
1658         static const struct swrap_file_hdr h;
1659         static const struct swrap_packet_frame f;
1660         static const union swrap_packet_ip i;
1661         static const union swrap_packet_payload p;
1662
1663         if (initialized == 1) {
1664                 return s;
1665         }
1666         initialized = 1;
1667
1668         /*
1669          * TODO: don't use the structs use plain buffer offsets
1670          *       and PUSH_U8(), PUSH_U16() and PUSH_U32()
1671          *
1672          * for now make sure we disable PCAP support
1673          * if the struct has alignment!
1674          */
1675         if (sizeof(h) != SWRAP_FILE_HDR_SIZE) {
1676                 return NULL;
1677         }
1678         if (sizeof(f) != SWRAP_PACKET_FRAME_SIZE) {
1679                 return NULL;
1680         }
1681         if (sizeof(i) != SWRAP_PACKET_IP_SIZE) {
1682                 return NULL;
1683         }
1684         if (sizeof(i.v4) != SWRAP_PACKET_IP_V4_SIZE) {
1685                 return NULL;
1686         }
1687         if (sizeof(i.v6) != SWRAP_PACKET_IP_V6_SIZE) {
1688                 return NULL;
1689         }
1690         if (sizeof(p) != SWRAP_PACKET_PAYLOAD_SIZE) {
1691                 return NULL;
1692         }
1693         if (sizeof(p.tcp) != SWRAP_PACKET_PAYLOAD_TCP_SIZE) {
1694                 return NULL;
1695         }
1696         if (sizeof(p.udp) != SWRAP_PACKET_PAYLOAD_UDP_SIZE) {
1697                 return NULL;
1698         }
1699         if (sizeof(p.icmp4) != SWRAP_PACKET_PAYLOAD_ICMP4_SIZE) {
1700                 return NULL;
1701         }
1702         if (sizeof(p.icmp6) != SWRAP_PACKET_PAYLOAD_ICMP6_SIZE) {
1703                 return NULL;
1704         }
1705
1706         s = getenv("SOCKET_WRAPPER_PCAP_FILE");
1707         if (s == NULL) {
1708                 return NULL;
1709         }
1710         if (strncmp(s, "./", 2) == 0) {
1711                 s += 2;
1712         }
1713         return s;
1714 }
1715
1716 static uint8_t *swrap_pcap_packet_init(struct timeval *tval,
1717                                        const struct sockaddr *src,
1718                                        const struct sockaddr *dest,
1719                                        int socket_type,
1720                                        const uint8_t *payload,
1721                                        size_t payload_len,
1722                                        unsigned long tcp_seqno,
1723                                        unsigned long tcp_ack,
1724                                        unsigned char tcp_ctl,
1725                                        int unreachable,
1726                                        size_t *_packet_len)
1727 {
1728         uint8_t *base;
1729         uint8_t *buf;
1730         struct swrap_packet_frame *frame;
1731         union swrap_packet_ip *ip;
1732         union swrap_packet_payload *pay;
1733         size_t packet_len;
1734         size_t alloc_len;
1735         size_t nonwire_len = sizeof(*frame);
1736         size_t wire_hdr_len = 0;
1737         size_t wire_len = 0;
1738         size_t ip_hdr_len = 0;
1739         size_t icmp_hdr_len = 0;
1740         size_t icmp_truncate_len = 0;
1741         uint8_t protocol = 0, icmp_protocol = 0;
1742         const struct sockaddr_in *src_in = NULL;
1743         const struct sockaddr_in *dest_in = NULL;
1744 #ifdef HAVE_IPV6
1745         const struct sockaddr_in6 *src_in6 = NULL;
1746         const struct sockaddr_in6 *dest_in6 = NULL;
1747 #endif
1748         uint16_t src_port;
1749         uint16_t dest_port;
1750
1751         switch (src->sa_family) {
1752         case AF_INET:
1753                 src_in = (const struct sockaddr_in *)(const void *)src;
1754                 dest_in = (const struct sockaddr_in *)(const void *)dest;
1755                 src_port = src_in->sin_port;
1756                 dest_port = dest_in->sin_port;
1757                 ip_hdr_len = sizeof(ip->v4);
1758                 break;
1759 #ifdef HAVE_IPV6
1760         case AF_INET6:
1761                 src_in6 = (const struct sockaddr_in6 *)(const void *)src;
1762                 dest_in6 = (const struct sockaddr_in6 *)(const void *)dest;
1763                 src_port = src_in6->sin6_port;
1764                 dest_port = dest_in6->sin6_port;
1765                 ip_hdr_len = sizeof(ip->v6);
1766                 break;
1767 #endif
1768         default:
1769                 return NULL;
1770         }
1771
1772         switch (socket_type) {
1773         case SOCK_STREAM:
1774                 protocol = 0x06; /* TCP */
1775                 wire_hdr_len = ip_hdr_len + sizeof(pay->tcp);
1776                 wire_len = wire_hdr_len + payload_len;
1777                 break;
1778
1779         case SOCK_DGRAM:
1780                 protocol = 0x11; /* UDP */
1781                 wire_hdr_len = ip_hdr_len + sizeof(pay->udp);
1782                 wire_len = wire_hdr_len + payload_len;
1783                 break;
1784
1785         default:
1786                 return NULL;
1787         }
1788
1789         if (unreachable) {
1790                 icmp_protocol = protocol;
1791                 switch (src->sa_family) {
1792                 case AF_INET:
1793                         protocol = 0x01; /* ICMPv4 */
1794                         icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp4);
1795                         break;
1796 #ifdef HAVE_IPV6
1797                 case AF_INET6:
1798                         protocol = 0x3A; /* ICMPv6 */
1799                         icmp_hdr_len = ip_hdr_len + sizeof(pay->icmp6);
1800                         break;
1801 #endif
1802                 }
1803                 if (wire_len > 64 ) {
1804                         icmp_truncate_len = wire_len - 64;
1805                 }
1806                 wire_hdr_len += icmp_hdr_len;
1807                 wire_len += icmp_hdr_len;
1808         }
1809
1810         packet_len = nonwire_len + wire_len;
1811         alloc_len = packet_len;
1812         if (alloc_len < SWRAP_PACKET_MIN_ALLOC) {
1813                 alloc_len = SWRAP_PACKET_MIN_ALLOC;
1814         }
1815
1816         base = (uint8_t *)malloc(alloc_len);
1817         if (base == NULL) {
1818                 return NULL;
1819         }
1820         memset(base, 0x0, alloc_len);
1821
1822         buf = base;
1823
1824         frame = (struct swrap_packet_frame *)(void *)buf;
1825         frame->seconds          = tval->tv_sec;
1826         frame->micro_seconds    = tval->tv_usec;
1827         frame->recorded_length  = wire_len - icmp_truncate_len;
1828         frame->full_length      = wire_len - icmp_truncate_len;
1829         buf += SWRAP_PACKET_FRAME_SIZE;
1830
1831         ip = (union swrap_packet_ip *)(void *)buf;
1832         switch (src->sa_family) {
1833         case AF_INET:
1834                 ip->v4.ver_hdrlen       = 0x45; /* version 4 and 5 * 32 bit words */
1835                 ip->v4.tos              = 0x00;
1836                 ip->v4.packet_length    = htons(wire_len - icmp_truncate_len);
1837                 ip->v4.identification   = htons(0xFFFF);
1838                 ip->v4.flags            = 0x40; /* BIT 1 set - means don't fragment */
1839                 ip->v4.fragment         = htons(0x0000);
1840                 ip->v4.ttl              = 0xFF;
1841                 ip->v4.protocol         = protocol;
1842                 ip->v4.hdr_checksum     = htons(0x0000);
1843                 ip->v4.src_addr         = src_in->sin_addr.s_addr;
1844                 ip->v4.dest_addr        = dest_in->sin_addr.s_addr;
1845                 buf += SWRAP_PACKET_IP_V4_SIZE;
1846                 break;
1847 #ifdef HAVE_IPV6
1848         case AF_INET6:
1849                 ip->v6.ver_prio         = 0x60; /* version 4 and 5 * 32 bit words */
1850                 ip->v6.flow_label_high  = 0x00;
1851                 ip->v6.flow_label_low   = 0x0000;
1852                 ip->v6.payload_length   = htons(wire_len - icmp_truncate_len); /* TODO */
1853                 ip->v6.next_header      = protocol;
1854                 memcpy(ip->v6.src_addr, src_in6->sin6_addr.s6_addr, 16);
1855                 memcpy(ip->v6.dest_addr, dest_in6->sin6_addr.s6_addr, 16);
1856                 buf += SWRAP_PACKET_IP_V6_SIZE;
1857                 break;
1858 #endif
1859         }
1860
1861         if (unreachable) {
1862                 pay = (union swrap_packet_payload *)(void *)buf;
1863                 switch (src->sa_family) {
1864                 case AF_INET:
1865                         pay->icmp4.type         = 0x03; /* destination unreachable */
1866                         pay->icmp4.code         = 0x01; /* host unreachable */
1867                         pay->icmp4.checksum     = htons(0x0000);
1868                         pay->icmp4.unused       = htonl(0x00000000);
1869                         buf += SWRAP_PACKET_PAYLOAD_ICMP4_SIZE;
1870
1871                         /* set the ip header in the ICMP payload */
1872                         ip = (union swrap_packet_ip *)(void *)buf;
1873                         ip->v4.ver_hdrlen       = 0x45; /* version 4 and 5 * 32 bit words */
1874                         ip->v4.tos              = 0x00;
1875                         ip->v4.packet_length    = htons(wire_len - icmp_hdr_len);
1876                         ip->v4.identification   = htons(0xFFFF);
1877                         ip->v4.flags            = 0x40; /* BIT 1 set - means don't fragment */
1878                         ip->v4.fragment         = htons(0x0000);
1879                         ip->v4.ttl              = 0xFF;
1880                         ip->v4.protocol         = icmp_protocol;
1881                         ip->v4.hdr_checksum     = htons(0x0000);
1882                         ip->v4.src_addr         = dest_in->sin_addr.s_addr;
1883                         ip->v4.dest_addr        = src_in->sin_addr.s_addr;
1884                         buf += SWRAP_PACKET_IP_V4_SIZE;
1885
1886                         src_port = dest_in->sin_port;
1887                         dest_port = src_in->sin_port;
1888                         break;
1889 #ifdef HAVE_IPV6
1890                 case AF_INET6:
1891                         pay->icmp6.type         = 0x01; /* destination unreachable */
1892                         pay->icmp6.code         = 0x03; /* address unreachable */
1893                         pay->icmp6.checksum     = htons(0x0000);
1894                         pay->icmp6.unused       = htonl(0x00000000);
1895                         buf += SWRAP_PACKET_PAYLOAD_ICMP6_SIZE;
1896
1897                         /* set the ip header in the ICMP payload */
1898                         ip = (union swrap_packet_ip *)(void *)buf;
1899                         ip->v6.ver_prio         = 0x60; /* version 4 and 5 * 32 bit words */
1900                         ip->v6.flow_label_high  = 0x00;
1901                         ip->v6.flow_label_low   = 0x0000;
1902                         ip->v6.payload_length   = htons(wire_len - icmp_truncate_len); /* TODO */
1903                         ip->v6.next_header      = protocol;
1904                         memcpy(ip->v6.src_addr, dest_in6->sin6_addr.s6_addr, 16);
1905                         memcpy(ip->v6.dest_addr, src_in6->sin6_addr.s6_addr, 16);
1906                         buf += SWRAP_PACKET_IP_V6_SIZE;
1907
1908                         src_port = dest_in6->sin6_port;
1909                         dest_port = src_in6->sin6_port;
1910                         break;
1911 #endif
1912                 }
1913         }
1914
1915         pay = (union swrap_packet_payload *)(void *)buf;
1916
1917         switch (socket_type) {
1918         case SOCK_STREAM:
1919                 pay->tcp.source_port    = src_port;
1920                 pay->tcp.dest_port      = dest_port;
1921                 pay->tcp.seq_num        = htonl(tcp_seqno);
1922                 pay->tcp.ack_num        = htonl(tcp_ack);
1923                 pay->tcp.hdr_length     = 0x50; /* 5 * 32 bit words */
1924                 pay->tcp.control        = tcp_ctl;
1925                 pay->tcp.window         = htons(0x7FFF);
1926                 pay->tcp.checksum       = htons(0x0000);
1927                 pay->tcp.urg            = htons(0x0000);
1928                 buf += SWRAP_PACKET_PAYLOAD_TCP_SIZE;
1929
1930                 break;
1931
1932         case SOCK_DGRAM:
1933                 pay->udp.source_port    = src_port;
1934                 pay->udp.dest_port      = dest_port;
1935                 pay->udp.length         = htons(8 + payload_len);
1936                 pay->udp.checksum       = htons(0x0000);
1937                 buf += SWRAP_PACKET_PAYLOAD_UDP_SIZE;
1938
1939                 break;
1940         }
1941
1942         if (payload && payload_len > 0) {
1943                 memcpy(buf, payload, payload_len);
1944         }
1945
1946         *_packet_len = packet_len - icmp_truncate_len;
1947         return base;
1948 }
1949
1950 static int swrap_pcap_get_fd(const char *fname)
1951 {
1952         static int fd = -1;
1953
1954         if (fd != -1) return fd;
1955
1956         fd = libc_open(fname, O_WRONLY|O_CREAT|O_EXCL|O_APPEND, 0644);
1957         if (fd != -1) {
1958                 struct swrap_file_hdr file_hdr;
1959                 file_hdr.magic          = 0xA1B2C3D4;
1960                 file_hdr.version_major  = 0x0002;
1961                 file_hdr.version_minor  = 0x0004;
1962                 file_hdr.timezone       = 0x00000000;
1963                 file_hdr.sigfigs        = 0x00000000;
1964                 file_hdr.frame_max_len  = SWRAP_FRAME_LENGTH_MAX;
1965                 file_hdr.link_type      = 0x0065; /* 101 RAW IP */
1966
1967                 if (write(fd, &file_hdr, sizeof(file_hdr)) != sizeof(file_hdr)) {
1968                         close(fd);
1969                         fd = -1;
1970                 }
1971                 return fd;
1972         }
1973
1974         fd = libc_open(fname, O_WRONLY|O_APPEND, 0644);
1975
1976         return fd;
1977 }
1978
1979 static uint8_t *swrap_pcap_marshall_packet(struct socket_info *si,
1980                                            const struct sockaddr *addr,
1981                                            enum swrap_packet_type type,
1982                                            const void *buf, size_t len,
1983                                            size_t *packet_len)
1984 {
1985         const struct sockaddr *src_addr;
1986         const struct sockaddr *dest_addr;
1987         unsigned long tcp_seqno = 0;
1988         unsigned long tcp_ack = 0;
1989         unsigned char tcp_ctl = 0;
1990         int unreachable = 0;
1991
1992         struct timeval tv;
1993
1994         switch (si->family) {
1995         case AF_INET:
1996                 break;
1997 #ifdef HAVE_IPV6
1998         case AF_INET6:
1999                 break;
2000 #endif
2001         default:
2002                 return NULL;
2003         }
2004
2005         switch (type) {
2006         case SWRAP_CONNECT_SEND:
2007                 if (si->type != SOCK_STREAM) return NULL;
2008
2009                 src_addr  = &si->myname.sa.s;
2010                 dest_addr = addr;
2011
2012                 tcp_seqno = si->io.pck_snd;
2013                 tcp_ack = si->io.pck_rcv;
2014                 tcp_ctl = 0x02; /* SYN */
2015
2016                 si->io.pck_snd += 1;
2017
2018                 break;
2019
2020         case SWRAP_CONNECT_RECV:
2021                 if (si->type != SOCK_STREAM) return NULL;
2022
2023                 dest_addr = &si->myname.sa.s;
2024                 src_addr = addr;
2025
2026                 tcp_seqno = si->io.pck_rcv;
2027                 tcp_ack = si->io.pck_snd;
2028                 tcp_ctl = 0x12; /** SYN,ACK */
2029
2030                 si->io.pck_rcv += 1;
2031
2032                 break;
2033
2034         case SWRAP_CONNECT_UNREACH:
2035                 if (si->type != SOCK_STREAM) return NULL;
2036
2037                 dest_addr = &si->myname.sa.s;
2038                 src_addr  = addr;
2039
2040                 /* Unreachable: resend the data of SWRAP_CONNECT_SEND */
2041                 tcp_seqno = si->io.pck_snd - 1;
2042                 tcp_ack = si->io.pck_rcv;
2043                 tcp_ctl = 0x02; /* SYN */
2044                 unreachable = 1;
2045
2046                 break;
2047
2048         case SWRAP_CONNECT_ACK:
2049                 if (si->type != SOCK_STREAM) return NULL;
2050
2051                 src_addr  = &si->myname.sa.s;
2052                 dest_addr = addr;
2053
2054                 tcp_seqno = si->io.pck_snd;
2055                 tcp_ack = si->io.pck_rcv;
2056                 tcp_ctl = 0x10; /* ACK */
2057
2058                 break;
2059
2060         case SWRAP_ACCEPT_SEND:
2061                 if (si->type != SOCK_STREAM) return NULL;
2062
2063                 dest_addr = &si->myname.sa.s;
2064                 src_addr = addr;
2065
2066                 tcp_seqno = si->io.pck_rcv;
2067                 tcp_ack = si->io.pck_snd;
2068                 tcp_ctl = 0x02; /* SYN */
2069
2070                 si->io.pck_rcv += 1;
2071
2072                 break;
2073
2074         case SWRAP_ACCEPT_RECV:
2075                 if (si->type != SOCK_STREAM) return NULL;
2076
2077                 src_addr = &si->myname.sa.s;
2078                 dest_addr = addr;
2079
2080                 tcp_seqno = si->io.pck_snd;
2081                 tcp_ack = si->io.pck_rcv;
2082                 tcp_ctl = 0x12; /* SYN,ACK */
2083
2084                 si->io.pck_snd += 1;
2085
2086                 break;
2087
2088         case SWRAP_ACCEPT_ACK:
2089                 if (si->type != SOCK_STREAM) return NULL;
2090
2091                 dest_addr = &si->myname.sa.s;
2092                 src_addr = addr;
2093
2094                 tcp_seqno = si->io.pck_rcv;
2095                 tcp_ack = si->io.pck_snd;
2096                 tcp_ctl = 0x10; /* ACK */
2097
2098                 break;
2099
2100         case SWRAP_SEND:
2101                 src_addr  = &si->myname.sa.s;
2102                 dest_addr = &si->peername.sa.s;
2103
2104                 tcp_seqno = si->io.pck_snd;
2105                 tcp_ack = si->io.pck_rcv;
2106                 tcp_ctl = 0x18; /* PSH,ACK */
2107
2108                 si->io.pck_snd += len;
2109
2110                 break;
2111
2112         case SWRAP_SEND_RST:
2113                 dest_addr = &si->myname.sa.s;
2114                 src_addr  = &si->peername.sa.s;
2115
2116                 if (si->type == SOCK_DGRAM) {
2117                         return swrap_pcap_marshall_packet(si,
2118                                                           &si->peername.sa.s,
2119                                                           SWRAP_SENDTO_UNREACH,
2120                                                           buf,
2121                                                           len,
2122                                                           packet_len);
2123                 }
2124
2125                 tcp_seqno = si->io.pck_rcv;
2126                 tcp_ack = si->io.pck_snd;
2127                 tcp_ctl = 0x14; /** RST,ACK */
2128
2129                 break;
2130
2131         case SWRAP_PENDING_RST:
2132                 dest_addr = &si->myname.sa.s;
2133                 src_addr  = &si->peername.sa.s;
2134
2135                 if (si->type == SOCK_DGRAM) {
2136                         return NULL;
2137                 }
2138
2139                 tcp_seqno = si->io.pck_rcv;
2140                 tcp_ack = si->io.pck_snd;
2141                 tcp_ctl = 0x14; /* RST,ACK */
2142
2143                 break;
2144
2145         case SWRAP_RECV:
2146                 dest_addr = &si->myname.sa.s;
2147                 src_addr  = &si->peername.sa.s;
2148
2149                 tcp_seqno = si->io.pck_rcv;
2150                 tcp_ack = si->io.pck_snd;
2151                 tcp_ctl = 0x18; /* PSH,ACK */
2152
2153                 si->io.pck_rcv += len;
2154
2155                 break;
2156
2157         case SWRAP_RECV_RST:
2158                 dest_addr = &si->myname.sa.s;
2159                 src_addr  = &si->peername.sa.s;
2160
2161                 if (si->type == SOCK_DGRAM) {
2162                         return NULL;
2163                 }
2164
2165                 tcp_seqno = si->io.pck_rcv;
2166                 tcp_ack = si->io.pck_snd;
2167                 tcp_ctl = 0x14; /* RST,ACK */
2168
2169                 break;
2170
2171         case SWRAP_SENDTO:
2172                 src_addr = &si->myname.sa.s;
2173                 dest_addr = addr;
2174
2175                 si->io.pck_snd += len;
2176
2177                 break;
2178
2179         case SWRAP_SENDTO_UNREACH:
2180                 dest_addr = &si->myname.sa.s;
2181                 src_addr = addr;
2182
2183                 unreachable = 1;
2184
2185                 break;
2186
2187         case SWRAP_RECVFROM:
2188                 dest_addr = &si->myname.sa.s;
2189                 src_addr = addr;
2190
2191                 si->io.pck_rcv += len;
2192
2193                 break;
2194
2195         case SWRAP_CLOSE_SEND:
2196                 if (si->type != SOCK_STREAM) return NULL;
2197
2198                 src_addr  = &si->myname.sa.s;
2199                 dest_addr = &si->peername.sa.s;
2200
2201                 tcp_seqno = si->io.pck_snd;
2202                 tcp_ack = si->io.pck_rcv;
2203                 tcp_ctl = 0x11; /* FIN, ACK */
2204
2205                 si->io.pck_snd += 1;
2206
2207                 break;
2208
2209         case SWRAP_CLOSE_RECV:
2210                 if (si->type != SOCK_STREAM) return NULL;
2211
2212                 dest_addr = &si->myname.sa.s;
2213                 src_addr  = &si->peername.sa.s;
2214
2215                 tcp_seqno = si->io.pck_rcv;
2216                 tcp_ack = si->io.pck_snd;
2217                 tcp_ctl = 0x11; /* FIN,ACK */
2218
2219                 si->io.pck_rcv += 1;
2220
2221                 break;
2222
2223         case SWRAP_CLOSE_ACK:
2224                 if (si->type != SOCK_STREAM) return NULL;
2225
2226                 src_addr  = &si->myname.sa.s;
2227                 dest_addr = &si->peername.sa.s;
2228
2229                 tcp_seqno = si->io.pck_snd;
2230                 tcp_ack = si->io.pck_rcv;
2231                 tcp_ctl = 0x10; /* ACK */
2232
2233                 break;
2234         default:
2235                 return NULL;
2236         }
2237
2238         swrapGetTimeOfDay(&tv);
2239
2240         return swrap_pcap_packet_init(&tv,
2241                                       src_addr,
2242                                       dest_addr,
2243                                       si->type,
2244                                       (const uint8_t *)buf,
2245                                       len,
2246                                       tcp_seqno,
2247                                       tcp_ack,
2248                                       tcp_ctl,
2249                                       unreachable,
2250                                       packet_len);
2251 }
2252
2253 static void swrap_pcap_dump_packet(struct socket_info *si,
2254                                    const struct sockaddr *addr,
2255                                    enum swrap_packet_type type,
2256                                    const void *buf, size_t len)
2257 {
2258         const char *file_name;
2259         uint8_t *packet;
2260         size_t packet_len = 0;
2261         int fd;
2262
2263         file_name = swrap_pcap_init_file();
2264         if (!file_name) {
2265                 return;
2266         }
2267
2268         packet = swrap_pcap_marshall_packet(si,
2269                                             addr,
2270                                             type,
2271                                             buf,
2272                                             len,
2273                                             &packet_len);
2274         if (packet == NULL) {
2275                 return;
2276         }
2277
2278         fd = swrap_pcap_get_fd(file_name);
2279         if (fd != -1) {
2280                 if (write(fd, packet, packet_len) != (ssize_t)packet_len) {
2281                         free(packet);
2282                         return;
2283                 }
2284         }
2285
2286         free(packet);
2287 }
2288
2289 /****************************************************************************
2290  *   SIGNALFD
2291  ***************************************************************************/
2292
2293 #ifdef HAVE_SIGNALFD
2294 static int swrap_signalfd(int fd, const sigset_t *mask, int flags)
2295 {
2296         int rc;
2297
2298         rc = libc_signalfd(fd, mask, flags);
2299         if (rc != -1) {
2300                 swrap_remove_stale(fd);
2301         }
2302
2303         return rc;
2304 }
2305
2306 int signalfd(int fd, const sigset_t *mask, int flags)
2307 {
2308         return swrap_signalfd(fd, mask, flags);
2309 }
2310 #endif
2311
2312 /****************************************************************************
2313  *   SOCKET
2314  ***************************************************************************/
2315
2316 static int swrap_socket(int family, int type, int protocol)
2317 {
2318         struct socket_info *si;
2319         struct socket_info_fd *fi;
2320         int fd;
2321         int real_type = type;
2322
2323         /*
2324          * Remove possible addition flags passed to socket() so
2325          * do not fail checking the type.
2326          * See https://lwn.net/Articles/281965/
2327          */
2328 #ifdef SOCK_CLOEXEC
2329         real_type &= ~SOCK_CLOEXEC;
2330 #endif
2331 #ifdef SOCK_NONBLOCK
2332         real_type &= ~SOCK_NONBLOCK;
2333 #endif
2334
2335         if (!socket_wrapper_enabled()) {
2336                 return libc_socket(family, type, protocol);
2337         }
2338
2339         switch (family) {
2340         case AF_INET:
2341 #ifdef HAVE_IPV6
2342         case AF_INET6:
2343 #endif
2344                 break;
2345         case AF_UNIX:
2346                 return libc_socket(family, type, protocol);
2347         default:
2348                 errno = EAFNOSUPPORT;
2349                 return -1;
2350         }
2351
2352         switch (real_type) {
2353         case SOCK_STREAM:
2354                 break;
2355         case SOCK_DGRAM:
2356                 break;
2357         default:
2358                 errno = EPROTONOSUPPORT;
2359                 return -1;
2360         }
2361
2362         switch (protocol) {
2363         case 0:
2364                 break;
2365         case 6:
2366                 if (real_type == SOCK_STREAM) {
2367                         break;
2368                 }
2369                 /*fall through*/
2370         case 17:
2371                 if (real_type == SOCK_DGRAM) {
2372                         break;
2373                 }
2374                 /*fall through*/
2375         default:
2376                 errno = EPROTONOSUPPORT;
2377                 return -1;
2378         }
2379
2380         /*
2381          * We must call libc_socket with type, from the caller, not the version
2382          * we removed SOCK_CLOEXEC and SOCK_NONBLOCK from
2383          */
2384         fd = libc_socket(AF_UNIX, type, 0);
2385
2386         if (fd == -1) {
2387                 return -1;
2388         }
2389
2390         /* Check if we have a stale fd and remove it */
2391         si = find_socket_info(fd);
2392         if (si != NULL) {
2393                 swrap_remove_stale(fd);
2394         }
2395
2396         si = (struct socket_info *)malloc(sizeof(struct socket_info));
2397         memset(si, 0, sizeof(struct socket_info));
2398         if (si == NULL) {
2399                 errno = ENOMEM;
2400                 return -1;
2401         }
2402
2403         si->family = family;
2404
2405         /* however, the rest of the socket_wrapper code expects just
2406          * the type, not the flags */
2407         si->type = real_type;
2408         si->protocol = protocol;
2409
2410         /*
2411          * Setup myname so getsockname() can succeed to find out the socket
2412          * type.
2413          */
2414         switch(si->family) {
2415         case AF_INET: {
2416                 struct sockaddr_in sin = {
2417                         .sin_family = AF_INET,
2418                 };
2419
2420                 si->myname.sa_socklen = sizeof(struct sockaddr_in);
2421                 memcpy(&si->myname.sa.in, &sin, si->myname.sa_socklen);
2422                 break;
2423         }
2424         case AF_INET6: {
2425                 struct sockaddr_in6 sin6 = {
2426                         .sin6_family = AF_INET6,
2427                 };
2428
2429                 si->myname.sa_socklen = sizeof(struct sockaddr_in6);
2430                 memcpy(&si->myname.sa.in6, &sin6, si->myname.sa_socklen);
2431                 break;
2432         }
2433         default:
2434                 free(si);
2435                 errno = EINVAL;
2436                 return -1;
2437         }
2438
2439         fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
2440         if (fi == NULL) {
2441                 free(si);
2442                 errno = ENOMEM;
2443                 return -1;
2444         }
2445
2446         fi->fd = fd;
2447
2448         SWRAP_DLIST_ADD(si->fds, fi);
2449         SWRAP_DLIST_ADD(sockets, si);
2450
2451         SWRAP_LOG(SWRAP_LOG_TRACE,
2452                   "Created %s socket for protocol %s",
2453                   si->family == AF_INET ? "IPv4" : "IPv6",
2454                   si->type == SOCK_DGRAM ? "UDP" : "TCP");
2455
2456         return fd;
2457 }
2458
2459 int socket(int family, int type, int protocol)
2460 {
2461         return swrap_socket(family, type, protocol);
2462 }
2463
2464 /****************************************************************************
2465  *   SOCKETPAIR
2466  ***************************************************************************/
2467
2468 static int swrap_socketpair(int family, int type, int protocol, int sv[2])
2469 {
2470         int rc;
2471
2472         rc = libc_socketpair(family, type, protocol, sv);
2473         if (rc != -1) {
2474                 swrap_remove_stale(sv[0]);
2475                 swrap_remove_stale(sv[1]);
2476         }
2477
2478         return rc;
2479 }
2480
2481 int socketpair(int family, int type, int protocol, int sv[2])
2482 {
2483         return swrap_socketpair(family, type, protocol, sv);
2484 }
2485
2486 /****************************************************************************
2487  *   SOCKETPAIR
2488  ***************************************************************************/
2489
2490 #ifdef HAVE_TIMERFD_CREATE
2491 static int swrap_timerfd_create(int clockid, int flags)
2492 {
2493         int fd;
2494
2495         fd = libc_timerfd_create(clockid, flags);
2496         if (fd != -1) {
2497                 swrap_remove_stale(fd);
2498         }
2499
2500         return fd;
2501 }
2502
2503 int timerfd_create(int clockid, int flags)
2504 {
2505         return swrap_timerfd_create(clockid, flags);
2506 }
2507 #endif
2508
2509 /****************************************************************************
2510  *   PIPE
2511  ***************************************************************************/
2512
2513 static int swrap_pipe(int pipefd[2])
2514 {
2515         int rc;
2516
2517         rc = libc_pipe(pipefd);
2518         if (rc != -1) {
2519                 swrap_remove_stale(pipefd[0]);
2520                 swrap_remove_stale(pipefd[1]);
2521         }
2522
2523         return rc;
2524 }
2525
2526 int pipe(int pipefd[2])
2527 {
2528         return swrap_pipe(pipefd);
2529 }
2530
2531 /****************************************************************************
2532  *   ACCEPT
2533  ***************************************************************************/
2534
2535 static int swrap_accept(int s, struct sockaddr *addr, socklen_t *addrlen)
2536 {
2537         struct socket_info *parent_si, *child_si;
2538         struct socket_info_fd *child_fi;
2539         int fd;
2540         struct swrap_address un_addr = {
2541                 .sa_socklen = sizeof(struct sockaddr_un),
2542         };
2543         struct swrap_address un_my_addr = {
2544                 .sa_socklen = sizeof(struct sockaddr_un),
2545         };
2546         struct swrap_address in_addr = {
2547                 .sa_socklen = sizeof(struct sockaddr_storage),
2548         };
2549         struct swrap_address in_my_addr = {
2550                 .sa_socklen = sizeof(struct sockaddr_storage),
2551         };
2552         int ret;
2553
2554         parent_si = find_socket_info(s);
2555         if (!parent_si) {
2556                 return libc_accept(s, addr, addrlen);
2557         }
2558
2559         /*
2560          * assume out sockaddr have the same size as the in parent
2561          * socket family
2562          */
2563         in_addr.sa_socklen = socket_length(parent_si->family);
2564         if (in_addr.sa_socklen <= 0) {
2565                 errno = EINVAL;
2566                 return -1;
2567         }
2568
2569         ret = libc_accept(s, &un_addr.sa.s, &un_addr.sa_socklen);
2570         if (ret == -1) {
2571                 if (errno == ENOTSOCK) {
2572                         /* Remove stale fds */
2573                         swrap_remove_stale(s);
2574                 }
2575                 return ret;
2576         }
2577
2578         fd = ret;
2579
2580         ret = sockaddr_convert_from_un(parent_si,
2581                                        &un_addr.sa.un,
2582                                        un_addr.sa_socklen,
2583                                        parent_si->family,
2584                                        &in_addr.sa.s,
2585                                        &in_addr.sa_socklen);
2586         if (ret == -1) {
2587                 close(fd);
2588                 return ret;
2589         }
2590
2591         child_si = (struct socket_info *)malloc(sizeof(struct socket_info));
2592         memset(child_si, 0, sizeof(struct socket_info));
2593
2594         child_fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
2595         if (child_fi == NULL) {
2596                 free(child_si);
2597                 close(fd);
2598                 errno = ENOMEM;
2599                 return -1;
2600         }
2601
2602         child_fi->fd = fd;
2603
2604         SWRAP_DLIST_ADD(child_si->fds, child_fi);
2605
2606         child_si->family = parent_si->family;
2607         child_si->type = parent_si->type;
2608         child_si->protocol = parent_si->protocol;
2609         child_si->bound = 1;
2610         child_si->is_server = 1;
2611         child_si->connected = 1;
2612
2613         child_si->peername = (struct swrap_address) {
2614                 .sa_socklen = in_addr.sa_socklen,
2615         };
2616         memcpy(&child_si->peername.sa.ss, &in_addr.sa.ss, in_addr.sa_socklen);
2617
2618         if (addr != NULL && addrlen != NULL) {
2619                 size_t copy_len = MIN(*addrlen, in_addr.sa_socklen);
2620                 if (copy_len > 0) {
2621                         memcpy(addr, &in_addr.sa.ss, copy_len);
2622                 }
2623                 *addrlen = in_addr.sa_socklen;
2624         }
2625
2626         ret = libc_getsockname(fd,
2627                                &un_my_addr.sa.s,
2628                                &un_my_addr.sa_socklen);
2629         if (ret == -1) {
2630                 free(child_fi);
2631                 free(child_si);
2632                 close(fd);
2633                 return ret;
2634         }
2635
2636         ret = sockaddr_convert_from_un(child_si,
2637                                        &un_my_addr.sa.un,
2638                                        un_my_addr.sa_socklen,
2639                                        child_si->family,
2640                                        &in_my_addr.sa.s,
2641                                        &in_my_addr.sa_socklen);
2642         if (ret == -1) {
2643                 free(child_fi);
2644                 free(child_si);
2645                 close(fd);
2646                 return ret;
2647         }
2648
2649         SWRAP_LOG(SWRAP_LOG_TRACE,
2650                   "accept() path=%s, fd=%d",
2651                   un_my_addr.sa.un.sun_path, s);
2652
2653         child_si->myname = (struct swrap_address) {
2654                 .sa_socklen = in_my_addr.sa_socklen,
2655         };
2656         memcpy(&child_si->myname.sa.ss, &in_my_addr.sa.ss, in_my_addr.sa_socklen);
2657
2658         SWRAP_DLIST_ADD(sockets, child_si);
2659
2660         if (addr != NULL) {
2661                 swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_SEND, NULL, 0);
2662                 swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_RECV, NULL, 0);
2663                 swrap_pcap_dump_packet(child_si, addr, SWRAP_ACCEPT_ACK, NULL, 0);
2664         }
2665
2666         return fd;
2667 }
2668
2669 #ifdef HAVE_ACCEPT_PSOCKLEN_T
2670 int accept(int s, struct sockaddr *addr, Psocklen_t addrlen)
2671 #else
2672 int accept(int s, struct sockaddr *addr, socklen_t *addrlen)
2673 #endif
2674 {
2675         return swrap_accept(s, addr, (socklen_t *)addrlen);
2676 }
2677
2678 static int autobind_start_init;
2679 static int autobind_start;
2680
2681 /* using sendto() or connect() on an unbound socket would give the
2682    recipient no way to reply, as unlike UDP and TCP, a unix domain
2683    socket can't auto-assign ephemeral port numbers, so we need to
2684    assign it here.
2685    Note: this might change the family from ipv6 to ipv4
2686 */
2687 static int swrap_auto_bind(int fd, struct socket_info *si, int family)
2688 {
2689         struct swrap_address un_addr = {
2690                 .sa_socklen = sizeof(struct sockaddr_un),
2691         };
2692         int i;
2693         char type;
2694         int ret;
2695         int port;
2696         struct stat st;
2697
2698         if (autobind_start_init != 1) {
2699                 autobind_start_init = 1;
2700                 autobind_start = getpid();
2701                 autobind_start %= 50000;
2702                 autobind_start += 10000;
2703         }
2704
2705         un_addr.sa.un.sun_family = AF_UNIX;
2706
2707         switch (family) {
2708         case AF_INET: {
2709                 struct sockaddr_in in;
2710
2711                 switch (si->type) {
2712                 case SOCK_STREAM:
2713                         type = SOCKET_TYPE_CHAR_TCP;
2714                         break;
2715                 case SOCK_DGRAM:
2716                         type = SOCKET_TYPE_CHAR_UDP;
2717                         break;
2718                 default:
2719                     errno = ESOCKTNOSUPPORT;
2720                     return -1;
2721                 }
2722
2723                 memset(&in, 0, sizeof(in));
2724                 in.sin_family = AF_INET;
2725                 in.sin_addr.s_addr = htonl(127<<24 |
2726                                            socket_wrapper_default_iface());
2727
2728                 si->myname = (struct swrap_address) {
2729                         .sa_socklen = sizeof(in),
2730                 };
2731                 memcpy(&si->myname.sa.in, &in, si->myname.sa_socklen);
2732                 break;
2733         }
2734 #ifdef HAVE_IPV6
2735         case AF_INET6: {
2736                 struct sockaddr_in6 in6;
2737
2738                 if (si->family != family) {
2739                         errno = ENETUNREACH;
2740                         return -1;
2741                 }
2742
2743                 switch (si->type) {
2744                 case SOCK_STREAM:
2745                         type = SOCKET_TYPE_CHAR_TCP_V6;
2746                         break;
2747                 case SOCK_DGRAM:
2748                         type = SOCKET_TYPE_CHAR_UDP_V6;
2749                         break;
2750                 default:
2751                         errno = ESOCKTNOSUPPORT;
2752                         return -1;
2753                 }
2754
2755                 memset(&in6, 0, sizeof(in6));
2756                 in6.sin6_family = AF_INET6;
2757                 in6.sin6_addr = *swrap_ipv6();
2758                 in6.sin6_addr.s6_addr[15] = socket_wrapper_default_iface();
2759
2760                 si->myname = (struct swrap_address) {
2761                         .sa_socklen = sizeof(in6),
2762                 };
2763                 memcpy(&si->myname.sa.in6, &in6, si->myname.sa_socklen);
2764                 break;
2765         }
2766 #endif
2767         default:
2768                 errno = ESOCKTNOSUPPORT;
2769                 return -1;
2770         }
2771
2772         if (autobind_start > 60000) {
2773                 autobind_start = 10000;
2774         }
2775
2776         for (i = 0; i < SOCKET_MAX_SOCKETS; i++) {
2777                 port = autobind_start + i;
2778                 snprintf(un_addr.sa.un.sun_path, sizeof(un_addr.sa.un.sun_path),
2779                          "%s/"SOCKET_FORMAT, socket_wrapper_dir(),
2780                          type, socket_wrapper_default_iface(), port);
2781                 if (stat(un_addr.sa.un.sun_path, &st) == 0) continue;
2782
2783                 ret = libc_bind(fd, &un_addr.sa.s, un_addr.sa_socklen);
2784                 if (ret == -1) return ret;
2785
2786                 si->un_addr = un_addr.sa.un;
2787
2788                 si->bound = 1;
2789                 autobind_start = port + 1;
2790                 break;
2791         }
2792         if (i == SOCKET_MAX_SOCKETS) {
2793                 SWRAP_LOG(SWRAP_LOG_ERROR, "Too many open unix sockets (%u) for "
2794                                            "interface "SOCKET_FORMAT,
2795                                            SOCKET_MAX_SOCKETS,
2796                                            type,
2797                                            socket_wrapper_default_iface(),
2798                                            0);
2799                 errno = ENFILE;
2800                 return -1;
2801         }
2802
2803         si->family = family;
2804         set_port(si->family, port, &si->myname);
2805
2806         return 0;
2807 }
2808
2809 /****************************************************************************
2810  *   CONNECT
2811  ***************************************************************************/
2812
2813 static int swrap_connect(int s, const struct sockaddr *serv_addr,
2814                          socklen_t addrlen)
2815 {
2816         int ret;
2817         struct swrap_address un_addr = {
2818                 .sa_socklen = sizeof(struct sockaddr_un),
2819         };
2820         struct socket_info *si = find_socket_info(s);
2821         int bcast = 0;
2822
2823         if (!si) {
2824                 return libc_connect(s, serv_addr, addrlen);
2825         }
2826
2827         if (si->bound == 0) {
2828                 ret = swrap_auto_bind(s, si, serv_addr->sa_family);
2829                 if (ret == -1) return -1;
2830         }
2831
2832         if (si->family != serv_addr->sa_family) {
2833                 errno = EINVAL;
2834                 return -1;
2835         }
2836
2837         ret = sockaddr_convert_to_un(si, serv_addr,
2838                                      addrlen, &un_addr.sa.un, 0, &bcast);
2839         if (ret == -1) return -1;
2840
2841         if (bcast) {
2842                 errno = ENETUNREACH;
2843                 return -1;
2844         }
2845
2846         if (si->type == SOCK_DGRAM) {
2847                 si->defer_connect = 1;
2848                 ret = 0;
2849         } else {
2850                 swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_SEND, NULL, 0);
2851
2852                 ret = libc_connect(s,
2853                                    &un_addr.sa.s,
2854                                    un_addr.sa_socklen);
2855         }
2856
2857         SWRAP_LOG(SWRAP_LOG_TRACE,
2858                   "connect() path=%s, fd=%d",
2859                   un_addr.sa.un.sun_path, s);
2860
2861
2862         /* to give better errors */
2863         if (ret == -1 && errno == ENOENT) {
2864                 errno = EHOSTUNREACH;
2865         }
2866
2867         if (ret == 0) {
2868                 si->peername = (struct swrap_address) {
2869                         .sa_socklen = addrlen,
2870                 };
2871
2872                 memcpy(&si->peername.sa.ss, serv_addr, addrlen);
2873                 si->connected = 1;
2874
2875                 /*
2876                  * When we connect() on a socket than we have to bind the
2877                  * outgoing connection on the interface we use for the
2878                  * transport. We already bound it on the right interface
2879                  * but here we have to update the name so getsockname()
2880                  * returns correct information.
2881                  */
2882                 if (si->bindname.sa_socklen > 0) {
2883                         si->myname = (struct swrap_address) {
2884                                 .sa_socklen = si->bindname.sa_socklen,
2885                         };
2886
2887                         memcpy(&si->myname.sa.ss,
2888                                &si->bindname.sa.ss,
2889                                si->bindname.sa_socklen);
2890
2891                         /* Cleanup bindname */
2892                         si->bindname = (struct swrap_address) {
2893                                 .sa_socklen = 0,
2894                         };
2895                 }
2896
2897                 swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_RECV, NULL, 0);
2898                 swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_ACK, NULL, 0);
2899         } else {
2900                 swrap_pcap_dump_packet(si, serv_addr, SWRAP_CONNECT_UNREACH, NULL, 0);
2901         }
2902
2903         return ret;
2904 }
2905
2906 int connect(int s, const struct sockaddr *serv_addr, socklen_t addrlen)
2907 {
2908         return swrap_connect(s, serv_addr, addrlen);
2909 }
2910
2911 /****************************************************************************
2912  *   BIND
2913  ***************************************************************************/
2914
2915 static int swrap_bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
2916 {
2917         int ret;
2918         struct swrap_address un_addr = {
2919                 .sa_socklen = sizeof(struct sockaddr_un),
2920         };
2921         struct socket_info *si = find_socket_info(s);
2922         int bind_error = 0;
2923 #if 0 /* FIXME */
2924         bool in_use;
2925 #endif
2926
2927         if (!si) {
2928                 return libc_bind(s, myaddr, addrlen);
2929         }
2930
2931         switch (si->family) {
2932         case AF_INET: {
2933                 const struct sockaddr_in *sin;
2934                 if (addrlen < sizeof(struct sockaddr_in)) {
2935                         bind_error = EINVAL;
2936                         break;
2937                 }
2938
2939                 sin = (const struct sockaddr_in *)(const void *)myaddr;
2940
2941                 if (sin->sin_family != AF_INET) {
2942                         bind_error = EAFNOSUPPORT;
2943                 }
2944
2945                 /* special case for AF_UNSPEC */
2946                 if (sin->sin_family == AF_UNSPEC &&
2947                     (sin->sin_addr.s_addr == htonl(INADDR_ANY)))
2948                 {
2949                         bind_error = 0;
2950                 }
2951
2952                 break;
2953         }
2954 #ifdef HAVE_IPV6
2955         case AF_INET6: {
2956                 const struct sockaddr_in6 *sin6;
2957                 if (addrlen < sizeof(struct sockaddr_in6)) {
2958                         bind_error = EINVAL;
2959                         break;
2960                 }
2961
2962                 sin6 = (const struct sockaddr_in6 *)(const void *)myaddr;
2963
2964                 if (sin6->sin6_family != AF_INET6) {
2965                         bind_error = EAFNOSUPPORT;
2966                 }
2967
2968                 break;
2969         }
2970 #endif
2971         default:
2972                 bind_error = EINVAL;
2973                 break;
2974         }
2975
2976         if (bind_error != 0) {
2977                 errno = bind_error;
2978                 return -1;
2979         }
2980
2981 #if 0 /* FIXME */
2982         in_use = check_addr_port_in_use(myaddr, addrlen);
2983         if (in_use) {
2984                 errno = EADDRINUSE;
2985                 return -1;
2986         }
2987 #endif
2988
2989         si->myname.sa_socklen = addrlen;
2990         memcpy(&si->myname.sa.ss, myaddr, addrlen);
2991
2992         ret = sockaddr_convert_to_un(si,
2993                                      myaddr,
2994                                      addrlen,
2995                                      &un_addr.sa.un,
2996                                      1,
2997                                      &si->bcast);
2998         if (ret == -1) return -1;
2999
3000         unlink(un_addr.sa.un.sun_path);
3001
3002         ret = libc_bind(s, &un_addr.sa.s, un_addr.sa_socklen);
3003
3004         SWRAP_LOG(SWRAP_LOG_TRACE,
3005                   "bind() path=%s, fd=%d",
3006                   un_addr.sa.un.sun_path, s);
3007
3008         if (ret == 0) {
3009                 si->bound = 1;
3010         }
3011
3012         return ret;
3013 }
3014
3015 int bind(int s, const struct sockaddr *myaddr, socklen_t addrlen)
3016 {
3017         return swrap_bind(s, myaddr, addrlen);
3018 }
3019
3020 /****************************************************************************
3021  *   BINDRESVPORT
3022  ***************************************************************************/
3023
3024 #ifdef HAVE_BINDRESVPORT
3025 static int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen);
3026
3027 static int swrap_bindresvport_sa(int sd, struct sockaddr *sa)
3028 {
3029         struct swrap_address myaddr = {
3030                 .sa_socklen = sizeof(struct sockaddr_storage),
3031         };
3032         socklen_t salen;
3033         static uint16_t port;
3034         uint16_t i;
3035         int rc = -1;
3036         int af;
3037
3038 #define SWRAP_STARTPORT 600
3039 #define SWRAP_ENDPORT (IPPORT_RESERVED - 1)
3040 #define SWRAP_NPORTS (SWRAP_ENDPORT - SWRAP_STARTPORT + 1)
3041
3042         if (port == 0) {
3043                 port = (getpid() % SWRAP_NPORTS) + SWRAP_STARTPORT;
3044         }
3045
3046         if (sa == NULL) {
3047                 salen = myaddr.sa_socklen;
3048                 sa = &myaddr.sa.s;
3049
3050                 rc = swrap_getsockname(sd, &myaddr.sa.s, &salen);
3051                 if (rc < 0) {
3052                         return -1;
3053                 }
3054
3055                 af = sa->sa_family;
3056                 memset(&myaddr.sa.ss, 0, salen);
3057         } else {
3058                 af = sa->sa_family;
3059         }
3060
3061         for (i = 0; i < SWRAP_NPORTS; i++, port++) {
3062                 switch(af) {
3063                 case AF_INET: {
3064                         struct sockaddr_in *sinp = (struct sockaddr_in *)(void *)sa;
3065
3066                         salen = sizeof(struct sockaddr_in);
3067                         sinp->sin_port = htons(port);
3068                         break;
3069                 }
3070                 case AF_INET6: {
3071                         struct sockaddr_in6 *sin6p = (struct sockaddr_in6 *)(void *)sa;
3072
3073                         salen = sizeof(struct sockaddr_in6);
3074                         sin6p->sin6_port = htons(port);
3075                         break;
3076                 }
3077                 default:
3078                         errno = EAFNOSUPPORT;
3079                         return -1;
3080                 }
3081                 sa->sa_family = af;
3082
3083                 if (port > SWRAP_ENDPORT) {
3084                         port = SWRAP_STARTPORT;
3085                 }
3086
3087                 rc = swrap_bind(sd, (struct sockaddr *)sa, salen);
3088                 if (rc == 0 || errno != EADDRINUSE) {
3089                         break;
3090                 }
3091         }
3092
3093         return rc;
3094 }
3095
3096 int bindresvport(int sockfd, struct sockaddr_in *sinp)
3097 {
3098         return swrap_bindresvport_sa(sockfd, (struct sockaddr *)sinp);
3099 }
3100 #endif
3101
3102 /****************************************************************************
3103  *   LISTEN
3104  ***************************************************************************/
3105
3106 static int swrap_listen(int s, int backlog)
3107 {
3108         int ret;
3109         struct socket_info *si = find_socket_info(s);
3110
3111         if (!si) {
3112                 return libc_listen(s, backlog);
3113         }
3114
3115         ret = libc_listen(s, backlog);
3116
3117         return ret;
3118 }
3119
3120 int listen(int s, int backlog)
3121 {
3122         return swrap_listen(s, backlog);
3123 }
3124
3125 /****************************************************************************
3126  *   FOPEN
3127  ***************************************************************************/
3128
3129 static FILE *swrap_fopen(const char *name, const char *mode)
3130 {
3131         FILE *fp;
3132
3133         fp = libc_fopen(name, mode);
3134         if (fp != NULL) {
3135                 int fd = fileno(fp);
3136
3137                 swrap_remove_stale(fd);
3138         }
3139
3140         return fp;
3141 }
3142
3143 FILE *fopen(const char *name, const char *mode)
3144 {
3145         return swrap_fopen(name, mode);
3146 }
3147
3148 /****************************************************************************
3149  *   OPEN
3150  ***************************************************************************/
3151
3152 static int swrap_vopen(const char *pathname, int flags, va_list ap)
3153 {
3154         int ret;
3155
3156         ret = libc_vopen(pathname, flags, ap);
3157         if (ret != -1) {
3158                 /*
3159                  * There are methods for closing descriptors (libc-internal code
3160                  * paths, direct syscalls) which close descriptors in ways that
3161                  * we can't intercept, so try to recover when we notice that
3162                  * that's happened
3163                  */
3164                 swrap_remove_stale(ret);
3165         }
3166         return ret;
3167 }
3168
3169 int open(const char *pathname, int flags, ...)
3170 {
3171         va_list ap;
3172         int fd;
3173
3174         va_start(ap, flags);
3175         fd = swrap_vopen(pathname, flags, ap);
3176         va_end(ap);
3177
3178         return fd;
3179 }
3180
3181 /****************************************************************************
3182  *   GETPEERNAME
3183  ***************************************************************************/
3184
3185 static int swrap_getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
3186 {
3187         struct socket_info *si = find_socket_info(s);
3188         socklen_t len;
3189
3190         if (!si) {
3191                 return libc_getpeername(s, name, addrlen);
3192         }
3193
3194         if (si->peername.sa_socklen == 0)
3195         {
3196                 errno = ENOTCONN;
3197                 return -1;
3198         }
3199
3200         len = MIN(*addrlen, si->peername.sa_socklen);
3201         if (len == 0) {
3202                 return 0;
3203         }
3204
3205         memcpy(name, &si->peername.sa.ss, len);
3206         *addrlen = si->peername.sa_socklen;
3207
3208         return 0;
3209 }
3210
3211 #ifdef HAVE_ACCEPT_PSOCKLEN_T
3212 int getpeername(int s, struct sockaddr *name, Psocklen_t addrlen)
3213 #else
3214 int getpeername(int s, struct sockaddr *name, socklen_t *addrlen)
3215 #endif
3216 {
3217         return swrap_getpeername(s, name, (socklen_t *)addrlen);
3218 }
3219
3220 /****************************************************************************
3221  *   GETSOCKNAME
3222  ***************************************************************************/
3223
3224 static int swrap_getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
3225 {
3226         struct socket_info *si = find_socket_info(s);
3227         socklen_t len;
3228
3229         if (!si) {
3230                 return libc_getsockname(s, name, addrlen);
3231         }
3232
3233         len = MIN(*addrlen, si->myname.sa_socklen);
3234         if (len == 0) {
3235                 return 0;
3236         }
3237
3238         memcpy(name, &si->myname.sa.ss, len);
3239         *addrlen = si->myname.sa_socklen;
3240
3241         return 0;
3242 }
3243
3244 #ifdef HAVE_ACCEPT_PSOCKLEN_T
3245 int getsockname(int s, struct sockaddr *name, Psocklen_t addrlen)
3246 #else
3247 int getsockname(int s, struct sockaddr *name, socklen_t *addrlen)
3248 #endif
3249 {
3250         return swrap_getsockname(s, name, (socklen_t *)addrlen);
3251 }
3252
3253 /****************************************************************************
3254  *   GETSOCKOPT
3255  ***************************************************************************/
3256
3257 #ifndef SO_PROTOCOL
3258 # ifdef SO_PROTOTYPE /* The Solaris name */
3259 #  define SO_PROTOCOL SO_PROTOTYPE
3260 # endif /* SO_PROTOTYPE */
3261 #endif /* SO_PROTOCOL */
3262
3263 static int swrap_getsockopt(int s, int level, int optname,
3264                             void *optval, socklen_t *optlen)
3265 {
3266         struct socket_info *si = find_socket_info(s);
3267
3268         if (!si) {
3269                 return libc_getsockopt(s,
3270                                        level,
3271                                        optname,
3272                                        optval,
3273                                        optlen);
3274         }
3275
3276         if (level == SOL_SOCKET) {
3277                 switch (optname) {
3278 #ifdef SO_DOMAIN
3279                 case SO_DOMAIN:
3280                         if (optval == NULL || optlen == NULL ||
3281                             *optlen < (socklen_t)sizeof(int)) {
3282                                 errno = EINVAL;
3283                                 return -1;
3284                         }
3285
3286                         *optlen = sizeof(int);
3287                         *(int *)optval = si->family;
3288                         return 0;
3289 #endif /* SO_DOMAIN */
3290
3291 #ifdef SO_PROTOCOL
3292                 case SO_PROTOCOL:
3293                         if (optval == NULL || optlen == NULL ||
3294                             *optlen < (socklen_t)sizeof(int)) {
3295                                 errno = EINVAL;
3296                                 return -1;
3297                         }
3298
3299                         *optlen = sizeof(int);
3300                         *(int *)optval = si->protocol;
3301                         return 0;
3302 #endif /* SO_PROTOCOL */
3303                 case SO_TYPE:
3304                         if (optval == NULL || optlen == NULL ||
3305                             *optlen < (socklen_t)sizeof(int)) {
3306                                 errno = EINVAL;
3307                                 return -1;
3308                         }
3309
3310                         *optlen = sizeof(int);
3311                         *(int *)optval = si->type;
3312                         return 0;
3313                 default:
3314                         return libc_getsockopt(s,
3315                                                level,
3316                                                optname,
3317                                                optval,
3318                                                optlen);
3319                 }
3320         }
3321
3322         errno = ENOPROTOOPT;
3323         return -1;
3324 }
3325
3326 #ifdef HAVE_ACCEPT_PSOCKLEN_T
3327 int getsockopt(int s, int level, int optname, void *optval, Psocklen_t optlen)
3328 #else
3329 int getsockopt(int s, int level, int optname, void *optval, socklen_t *optlen)
3330 #endif
3331 {
3332         return swrap_getsockopt(s, level, optname, optval, (socklen_t *)optlen);
3333 }
3334
3335 /****************************************************************************
3336  *   SETSOCKOPT
3337  ***************************************************************************/
3338
3339 static int swrap_setsockopt(int s, int level, int optname,
3340                             const void *optval, socklen_t optlen)
3341 {
3342         struct socket_info *si = find_socket_info(s);
3343
3344         if (!si) {
3345                 return libc_setsockopt(s,
3346                                        level,
3347                                        optname,
3348                                        optval,
3349                                        optlen);
3350         }
3351
3352         if (level == SOL_SOCKET) {
3353                 return libc_setsockopt(s,
3354                                        level,
3355                                        optname,
3356                                        optval,
3357                                        optlen);
3358         }
3359
3360         switch (si->family) {
3361         case AF_INET:
3362                 if (level == IPPROTO_IP) {
3363 #ifdef IP_PKTINFO
3364                         if (optname == IP_PKTINFO) {
3365                                 si->pktinfo = AF_INET;
3366                         }
3367 #endif /* IP_PKTINFO */
3368                 }
3369                 return 0;
3370 #ifdef HAVE_IPV6
3371         case AF_INET6:
3372                 if (level == IPPROTO_IPV6) {
3373 #ifdef IPV6_RECVPKTINFO
3374                         if (optname == IPV6_RECVPKTINFO) {
3375                                 si->pktinfo = AF_INET6;
3376                         }
3377 #endif /* IPV6_PKTINFO */
3378                 }
3379                 return 0;
3380 #endif
3381         default:
3382                 errno = ENOPROTOOPT;
3383                 return -1;
3384         }
3385 }
3386
3387 int setsockopt(int s, int level, int optname,
3388                const void *optval, socklen_t optlen)
3389 {
3390         return swrap_setsockopt(s, level, optname, optval, optlen);
3391 }
3392
3393 /****************************************************************************
3394  *   IOCTL
3395  ***************************************************************************/
3396
3397 static int swrap_vioctl(int s, unsigned long int r, va_list va)
3398 {
3399         struct socket_info *si = find_socket_info(s);
3400         va_list ap;
3401         int value;
3402         int rc;
3403
3404         if (!si) {
3405                 return libc_vioctl(s, r, va);
3406         }
3407
3408         va_copy(ap, va);
3409
3410         rc = libc_vioctl(s, r, va);
3411
3412         switch (r) {
3413         case FIONREAD:
3414                 value = *((int *)va_arg(ap, int *));
3415
3416                 if (rc == -1 && errno != EAGAIN && errno != ENOBUFS) {
3417                         swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
3418                 } else if (value == 0) { /* END OF FILE */
3419                         swrap_pcap_dump_packet(si, NULL, SWRAP_PENDING_RST, NULL, 0);
3420                 }
3421                 break;
3422         }
3423
3424         va_end(ap);
3425
3426         return rc;
3427 }
3428
3429 #ifdef HAVE_IOCTL_INT
3430 int ioctl(int s, int r, ...)
3431 #else
3432 int ioctl(int s, unsigned long int r, ...)
3433 #endif
3434 {
3435         va_list va;
3436         int rc;
3437
3438         va_start(va, r);
3439
3440         rc = swrap_vioctl(s, (unsigned long int) r, va);
3441
3442         va_end(va);
3443
3444         return rc;
3445 }
3446
3447 /*****************
3448  * CMSG
3449  *****************/
3450
3451 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
3452
3453 #ifndef CMSG_ALIGN
3454 # ifdef _ALIGN /* BSD */
3455 #define CMSG_ALIGN _ALIGN
3456 # else
3457 #define CMSG_ALIGN(len) (((len) + sizeof(size_t) - 1) & ~(sizeof(size_t) - 1))
3458 # endif /* _ALIGN */
3459 #endif /* CMSG_ALIGN */
3460
3461 /**
3462  * @brief Add a cmsghdr to a msghdr.
3463  *
3464  * This is an function to add any type of cmsghdr. It will operate on the
3465  * msg->msg_control and msg->msg_controllen you pass in by adapting them to
3466  * the buffer position after the added cmsg element. Hence, this function is
3467  * intended to be used with an intermediate msghdr and not on the original
3468  * one handed in by the client.
3469  *
3470  * @param[in]  msg      The msghdr to which to add the cmsg.
3471  *
3472  * @param[in]  level    The cmsg level to set.
3473  *
3474  * @param[in]  type     The cmsg type to set.
3475  *
3476  * @param[in]  data     The cmsg data to set.
3477  *
3478  * @param[in]  len      the length of the data to set.
3479  */
3480 static void swrap_msghdr_add_cmsghdr(struct msghdr *msg,
3481                                      int level,
3482                                      int type,
3483                                      const void *data,
3484                                      size_t len)
3485 {
3486         size_t cmlen = CMSG_LEN(len);
3487         size_t cmspace = CMSG_SPACE(len);
3488         uint8_t cmbuf[cmspace];
3489         void *cast_ptr = (void *)cmbuf;
3490         struct cmsghdr *cm = (struct cmsghdr *)cast_ptr;
3491         uint8_t *p;
3492
3493         memset(cmbuf, 0, cmspace);
3494
3495         if (msg->msg_controllen < cmlen) {
3496                 cmlen = msg->msg_controllen;
3497                 msg->msg_flags |= MSG_CTRUNC;
3498         }
3499
3500         if (msg->msg_controllen < cmspace) {
3501                 cmspace = msg->msg_controllen;
3502         }
3503
3504         /*
3505          * We copy the full input data into an intermediate cmsghdr first
3506          * in order to more easily cope with truncation.
3507          */
3508         cm->cmsg_len = cmlen;
3509         cm->cmsg_level = level;
3510         cm->cmsg_type = type;
3511         memcpy(CMSG_DATA(cm), data, len);
3512
3513         /*
3514          * We now copy the possibly truncated buffer.
3515          * We copy cmlen bytes, but consume cmspace bytes,
3516          * leaving the possible padding uninitialiazed.
3517          */
3518         p = (uint8_t *)msg->msg_control;
3519         memcpy(p, cm, cmlen);
3520         p += cmspace;
3521         msg->msg_control = p;
3522         msg->msg_controllen -= cmspace;
3523
3524         return;
3525 }
3526
3527 static int swrap_msghdr_add_pktinfo(struct socket_info *si,
3528                                     struct msghdr *msg)
3529 {
3530         /* Add packet info */
3531         switch (si->pktinfo) {
3532 #if defined(IP_PKTINFO) && (defined(HAVE_STRUCT_IN_PKTINFO) || defined(IP_RECVDSTADDR))
3533         case AF_INET: {
3534                 struct sockaddr_in *sin;
3535 #if defined(HAVE_STRUCT_IN_PKTINFO)
3536                 struct in_pktinfo pkt;
3537 #elif defined(IP_RECVDSTADDR)
3538                 struct in_addr pkt;
3539 #endif
3540
3541                 if (si->bindname.sa_socklen == sizeof(struct sockaddr_in)) {
3542                         sin = &si->bindname.sa.in;
3543                 } else {
3544                         if (si->myname.sa_socklen != sizeof(struct sockaddr_in)) {
3545                                 return 0;
3546                         }
3547                         sin = &si->myname.sa.in;
3548                 }
3549
3550                 ZERO_STRUCT(pkt);
3551
3552 #if defined(HAVE_STRUCT_IN_PKTINFO)
3553                 pkt.ipi_ifindex = socket_wrapper_default_iface();
3554                 pkt.ipi_addr.s_addr = sin->sin_addr.s_addr;
3555 #elif defined(IP_RECVDSTADDR)
3556                 pkt = sin->sin_addr;
3557 #endif
3558
3559                 swrap_msghdr_add_cmsghdr(msg, IPPROTO_IP, IP_PKTINFO,
3560                                          &pkt, sizeof(pkt));
3561
3562                 break;
3563         }
3564 #endif /* IP_PKTINFO */
3565 #if defined(HAVE_IPV6)
3566         case AF_INET6: {
3567 #if defined(IPV6_PKTINFO) && defined(HAVE_STRUCT_IN6_PKTINFO)
3568                 struct sockaddr_in6 *sin6;
3569                 struct in6_pktinfo pkt6;
3570
3571                 if (si->bindname.sa_socklen == sizeof(struct sockaddr_in6)) {
3572                         sin6 = &si->bindname.sa.in6;
3573                 } else {
3574                         if (si->myname.sa_socklen != sizeof(struct sockaddr_in6)) {
3575                                 return 0;
3576                         }
3577                         sin6 = &si->myname.sa.in6;
3578                 }
3579
3580                 ZERO_STRUCT(pkt6);
3581
3582                 pkt6.ipi6_ifindex = socket_wrapper_default_iface();
3583                 pkt6.ipi6_addr = sin6->sin6_addr;
3584
3585                 swrap_msghdr_add_cmsghdr(msg, IPPROTO_IPV6, IPV6_PKTINFO,
3586                                         &pkt6, sizeof(pkt6));
3587 #endif /* HAVE_STRUCT_IN6_PKTINFO */
3588
3589                 break;
3590         }
3591 #endif /* IPV6_PKTINFO */
3592         default:
3593                 return -1;
3594         }
3595
3596         return 0;
3597 }
3598
3599 static int swrap_msghdr_add_socket_info(struct socket_info *si,
3600                                         struct msghdr *omsg)
3601 {
3602         int rc = 0;
3603
3604         if (si->pktinfo > 0) {
3605                 rc = swrap_msghdr_add_pktinfo(si, omsg);
3606         }
3607
3608         return rc;
3609 }
3610
3611 static int swrap_sendmsg_copy_cmsg(struct cmsghdr *cmsg,
3612                                    uint8_t **cm_data,
3613                                    size_t *cm_data_space);
3614 static int swrap_sendmsg_filter_cmsg_socket(struct cmsghdr *cmsg,
3615                                             uint8_t **cm_data,
3616                                             size_t *cm_data_space);
3617
3618 static int swrap_sendmsg_filter_cmsghdr(struct msghdr *msg,
3619                                         uint8_t **cm_data,
3620                                         size_t *cm_data_space) {
3621         struct cmsghdr *cmsg;
3622         int rc = -1;
3623
3624         /* Nothing to do */
3625         if (msg->msg_controllen == 0 || msg->msg_control == NULL) {
3626                 return 0;
3627         }
3628
3629         for (cmsg = CMSG_FIRSTHDR(msg);
3630              cmsg != NULL;
3631              cmsg = CMSG_NXTHDR(msg, cmsg)) {
3632                 switch (cmsg->cmsg_level) {
3633                 case IPPROTO_IP:
3634                         rc = swrap_sendmsg_filter_cmsg_socket(cmsg,
3635                                                               cm_data,
3636                                                               cm_data_space);
3637                         break;
3638                 default:
3639                         rc = swrap_sendmsg_copy_cmsg(cmsg,
3640                                                      cm_data,
3641                                                      cm_data_space);
3642                         break;
3643                 }
3644         }
3645
3646         return rc;
3647 }
3648
3649 static int swrap_sendmsg_copy_cmsg(struct cmsghdr *cmsg,
3650                                    uint8_t **cm_data,
3651                                    size_t *cm_data_space)
3652 {
3653         size_t cmspace;
3654         uint8_t *p;
3655
3656         cmspace =
3657                 (*cm_data_space) +
3658                 CMSG_SPACE(cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr)));
3659
3660         p = realloc((*cm_data), cmspace);
3661         if (p == NULL) {
3662                 return -1;
3663         }
3664         (*cm_data) = p;
3665
3666         p = (*cm_data) + (*cm_data_space);
3667         *cm_data_space = cmspace;
3668
3669         memcpy(p, cmsg, cmsg->cmsg_len);
3670
3671         return 0;
3672 }
3673
3674 static int swrap_sendmsg_filter_cmsg_pktinfo(struct cmsghdr *cmsg,
3675                                             uint8_t **cm_data,
3676                                             size_t *cm_data_space);
3677
3678
3679 static int swrap_sendmsg_filter_cmsg_socket(struct cmsghdr *cmsg,
3680                                             uint8_t **cm_data,
3681                                             size_t *cm_data_space)
3682 {
3683         int rc = -1;
3684
3685         switch(cmsg->cmsg_type) {
3686 #ifdef IP_PKTINFO
3687         case IP_PKTINFO:
3688                 rc = swrap_sendmsg_filter_cmsg_pktinfo(cmsg,
3689                                                        cm_data,
3690                                                        cm_data_space);
3691                 break;
3692 #endif
3693 #ifdef IPV6_PKTINFO
3694         case IPV6_PKTINFO:
3695                 rc = swrap_sendmsg_filter_cmsg_pktinfo(cmsg,
3696                                                        cm_data,
3697                                                        cm_data_space);
3698                 break;
3699 #endif
3700         default:
3701                 break;
3702         }
3703
3704         return rc;
3705 }
3706
3707 static int swrap_sendmsg_filter_cmsg_pktinfo(struct cmsghdr *cmsg,
3708                                              uint8_t **cm_data,
3709                                              size_t *cm_data_space)
3710 {
3711         (void)cmsg; /* unused */
3712         (void)cm_data; /* unused */
3713         (void)cm_data_space; /* unused */
3714
3715         /*
3716          * Passing a IP pktinfo to a unix socket might be rejected by the
3717          * Kernel, at least on FreeBSD. So skip this cmsg.
3718          */
3719         return 0;
3720 }
3721 #endif /* HAVE_STRUCT_MSGHDR_MSG_CONTROL */
3722
3723 static ssize_t swrap_sendmsg_before(int fd,
3724                                     struct socket_info *si,
3725                                     struct msghdr *msg,
3726                                     struct iovec *tmp_iov,
3727                                     struct sockaddr_un *tmp_un,
3728                                     const struct sockaddr_un **to_un,
3729                                     const struct sockaddr **to,
3730                                     int *bcast)
3731 {
3732         size_t i, len = 0;
3733         ssize_t ret;
3734
3735         if (to_un) {
3736                 *to_un = NULL;
3737         }
3738         if (to) {
3739                 *to = NULL;
3740         }
3741         if (bcast) {
3742                 *bcast = 0;
3743         }
3744
3745         switch (si->type) {
3746         case SOCK_STREAM:
3747                 if (!si->connected) {
3748                         errno = ENOTCONN;
3749                         return -1;
3750                 }
3751
3752                 if (msg->msg_iovlen == 0) {
3753                         break;
3754                 }
3755
3756                 for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
3757                         size_t nlen;
3758                         nlen = len + msg->msg_iov[i].iov_len;
3759                         if (nlen > SOCKET_MAX_PACKET) {
3760                                 break;
3761                         }
3762                 }
3763                 msg->msg_iovlen = i;
3764                 if (msg->msg_iovlen == 0) {
3765                         *tmp_iov = msg->msg_iov[0];
3766                         tmp_iov->iov_len = MIN(tmp_iov->iov_len, SOCKET_MAX_PACKET);
3767                         msg->msg_iov = tmp_iov;
3768                         msg->msg_iovlen = 1;
3769                 }
3770                 break;
3771
3772         case SOCK_DGRAM:
3773                 if (si->connected) {
3774                         if (msg->msg_name) {
3775                                 errno = EISCONN;
3776                                 return -1;
3777                         }
3778                 } else {
3779                         const struct sockaddr *msg_name;
3780                         msg_name = (const struct sockaddr *)msg->msg_name;
3781
3782                         if (msg_name == NULL) {
3783                                 errno = ENOTCONN;
3784                                 return -1;
3785                         }
3786
3787
3788                         ret = sockaddr_convert_to_un(si, msg_name, msg->msg_namelen,
3789                                                      tmp_un, 0, bcast);
3790                         if (ret == -1) return -1;
3791
3792                         if (to_un) {
3793                                 *to_un = tmp_un;
3794                         }
3795                         if (to) {
3796                                 *to = msg_name;
3797                         }
3798                         msg->msg_name = tmp_un;
3799                         msg->msg_namelen = sizeof(*tmp_un);
3800                 }
3801
3802                 if (si->bound == 0) {
3803                         ret = swrap_auto_bind(fd, si, si->family);
3804                         if (ret == -1) {
3805                                 if (errno == ENOTSOCK) {
3806                                         swrap_remove_stale(fd);
3807                                         return -ENOTSOCK;
3808                                 } else {
3809                                         SWRAP_LOG(SWRAP_LOG_ERROR, "swrap_sendmsg_before failed");
3810                                         return -1;
3811                                 }
3812                         }
3813                 }
3814
3815                 if (!si->defer_connect) {
3816                         break;
3817                 }
3818
3819                 ret = sockaddr_convert_to_un(si,
3820                                              &si->peername.sa.s,
3821                                              si->peername.sa_socklen,
3822                                              tmp_un,
3823                                              0,
3824                                              NULL);
3825                 if (ret == -1) return -1;
3826
3827                 ret = libc_connect(fd,
3828                                    (struct sockaddr *)(void *)tmp_un,
3829                                    sizeof(*tmp_un));
3830
3831                 /* to give better errors */
3832                 if (ret == -1 && errno == ENOENT) {
3833                         errno = EHOSTUNREACH;
3834                 }
3835
3836                 if (ret == -1) {
3837                         return ret;
3838                 }
3839
3840                 si->defer_connect = 0;
3841                 break;
3842         default:
3843                 errno = EHOSTUNREACH;
3844                 return -1;
3845         }
3846
3847 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
3848         if (msg->msg_controllen > 0 && msg->msg_control != NULL) {
3849                 uint8_t *cmbuf = NULL;
3850                 size_t cmlen = 0;
3851
3852                 ret = swrap_sendmsg_filter_cmsghdr(msg, &cmbuf, &cmlen);
3853                 if (ret < 0) {
3854                         free(cmbuf);
3855                         return -1;
3856                 }
3857
3858                 if (cmlen == 0) {
3859                         msg->msg_controllen = 0;
3860                         msg->msg_control = NULL;
3861                 } else if (cmlen < msg->msg_controllen && cmbuf != NULL) {
3862                         memcpy(msg->msg_control, cmbuf, cmlen);
3863                         msg->msg_controllen = cmlen;
3864                 }
3865                 free(cmbuf);
3866         }
3867 #endif
3868
3869         return 0;
3870 }
3871
3872 static void swrap_sendmsg_after(int fd,
3873                                 struct socket_info *si,
3874                                 struct msghdr *msg,
3875                                 const struct sockaddr *to,
3876                                 ssize_t ret)
3877 {
3878         int saved_errno = errno;
3879         size_t i, len = 0;
3880         uint8_t *buf;
3881         off_t ofs = 0;
3882         size_t avail = 0;
3883         size_t remain;
3884
3885         /* to give better errors */
3886         if (ret == -1) {
3887                 if (saved_errno == ENOENT) {
3888                         saved_errno = EHOSTUNREACH;
3889                 } else if (saved_errno == ENOTSOCK) {
3890                         /* If the fd is not a socket, remove it */
3891                         swrap_remove_stale(fd);
3892                 }
3893         }
3894
3895         for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
3896                 avail += msg->msg_iov[i].iov_len;
3897         }
3898
3899         if (ret == -1) {
3900                 remain = MIN(80, avail);
3901         } else {
3902                 remain = ret;
3903         }
3904
3905         /* we capture it as one single packet */
3906         buf = (uint8_t *)malloc(remain);
3907         if (!buf) {
3908                 /* we just not capture the packet */
3909                 errno = saved_errno;
3910                 return;
3911         }
3912
3913         for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
3914                 size_t this_time = MIN(remain, (size_t)msg->msg_iov[i].iov_len);
3915                 memcpy(buf + ofs,
3916                        msg->msg_iov[i].iov_base,
3917                        this_time);
3918                 ofs += this_time;
3919                 remain -= this_time;
3920         }
3921         len = ofs;
3922
3923         switch (si->type) {
3924         case SOCK_STREAM:
3925                 if (ret == -1) {
3926                         swrap_pcap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
3927                         swrap_pcap_dump_packet(si, NULL, SWRAP_SEND_RST, NULL, 0);
3928                 } else {
3929                         swrap_pcap_dump_packet(si, NULL, SWRAP_SEND, buf, len);
3930                 }
3931                 break;
3932
3933         case SOCK_DGRAM:
3934                 if (si->connected) {
3935                         to = &si->peername.sa.s;
3936                 }
3937                 if (ret == -1) {
3938                         swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
3939                         swrap_pcap_dump_packet(si, to, SWRAP_SENDTO_UNREACH, buf, len);
3940                 } else {
3941                         swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
3942                 }
3943                 break;
3944         }
3945
3946         free(buf);
3947         errno = saved_errno;
3948 }
3949
3950 static int swrap_recvmsg_before(int fd,
3951                                 struct socket_info *si,
3952                                 struct msghdr *msg,
3953                                 struct iovec *tmp_iov)
3954 {
3955         size_t i, len = 0;
3956         ssize_t ret;
3957
3958         (void)fd; /* unused */
3959
3960         switch (si->type) {
3961         case SOCK_STREAM:
3962                 if (!si->connected) {
3963                         errno = ENOTCONN;
3964                         return -1;
3965                 }
3966
3967                 if (msg->msg_iovlen == 0) {
3968                         break;
3969                 }
3970
3971                 for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
3972                         size_t nlen;
3973                         nlen = len + msg->msg_iov[i].iov_len;
3974                         if (nlen > SOCKET_MAX_PACKET) {
3975                                 break;
3976                         }
3977                 }
3978                 msg->msg_iovlen = i;
3979                 if (msg->msg_iovlen == 0) {
3980                         *tmp_iov = msg->msg_iov[0];
3981                         tmp_iov->iov_len = MIN(tmp_iov->iov_len, SOCKET_MAX_PACKET);
3982                         msg->msg_iov = tmp_iov;
3983                         msg->msg_iovlen = 1;
3984                 }
3985                 break;
3986
3987         case SOCK_DGRAM:
3988                 if (msg->msg_name == NULL) {
3989                         errno = EINVAL;
3990                         return -1;
3991                 }
3992
3993                 if (msg->msg_iovlen == 0) {
3994                         break;
3995                 }
3996
3997                 if (si->bound == 0) {
3998                         ret = swrap_auto_bind(fd, si, si->family);
3999                         if (ret == -1) {
4000                                 /*
4001                                  * When attempting to read or write to a
4002                                  * descriptor, if an underlying autobind fails
4003                                  * because it's not a socket, stop intercepting
4004                                  * uses of that descriptor.
4005                                  */
4006                                 if (errno == ENOTSOCK) {
4007                                         swrap_remove_stale(fd);
4008                                         return -ENOTSOCK;
4009                                 } else {
4010                                         SWRAP_LOG(SWRAP_LOG_ERROR,
4011                                                   "swrap_recvmsg_before failed");
4012                                         return -1;
4013                                 }
4014                         }
4015                 }
4016                 break;
4017         default:
4018                 errno = EHOSTUNREACH;
4019                 return -1;
4020         }
4021
4022         return 0;
4023 }
4024
4025 static int swrap_recvmsg_after(int fd,
4026                                struct socket_info *si,
4027                                struct msghdr *msg,
4028                                const struct sockaddr_un *un_addr,
4029                                socklen_t un_addrlen,
4030                                ssize_t ret)
4031 {
4032         int saved_errno = errno;
4033         size_t i;
4034         uint8_t *buf = NULL;
4035         off_t ofs = 0;
4036         size_t avail = 0;
4037         size_t remain;
4038         int rc;
4039
4040         /* to give better errors */
4041         if (ret == -1) {
4042                 if (saved_errno == ENOENT) {
4043                         saved_errno = EHOSTUNREACH;
4044                 } else if (saved_errno == ENOTSOCK) {
4045                         /* If the fd is not a socket, remove it */
4046                         swrap_remove_stale(fd);
4047                 }
4048         }
4049
4050         for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
4051                 avail += msg->msg_iov[i].iov_len;
4052         }
4053
4054         if (avail == 0) {
4055                 rc = 0;
4056                 goto done;
4057         }
4058
4059         if (ret == -1) {
4060                 remain = MIN(80, avail);
4061         } else {
4062                 remain = ret;
4063         }
4064
4065         /* we capture it as one single packet */
4066         buf = (uint8_t *)malloc(remain);
4067         if (buf == NULL) {
4068                 /* we just not capture the packet */
4069                 errno = saved_errno;
4070                 return -1;
4071         }
4072
4073         for (i = 0; i < (size_t)msg->msg_iovlen; i++) {
4074                 size_t this_time = MIN(remain, (size_t)msg->msg_iov[i].iov_len);
4075                 memcpy(buf + ofs,
4076                        msg->msg_iov[i].iov_base,
4077                        this_time);
4078                 ofs += this_time;
4079                 remain -= this_time;
4080         }
4081
4082         switch (si->type) {
4083         case SOCK_STREAM:
4084                 if (ret == -1 && saved_errno != EAGAIN && saved_errno != ENOBUFS) {
4085                         swrap_pcap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
4086                 } else if (ret == 0) { /* END OF FILE */
4087                         swrap_pcap_dump_packet(si, NULL, SWRAP_RECV_RST, NULL, 0);
4088                 } else if (ret > 0) {
4089                         swrap_pcap_dump_packet(si, NULL, SWRAP_RECV, buf, ret);
4090                 }
4091                 break;
4092
4093         case SOCK_DGRAM:
4094                 if (ret == -1) {
4095                         break;
4096                 }
4097
4098                 if (un_addr != NULL) {
4099                         rc = sockaddr_convert_from_un(si,
4100                                                       un_addr,
4101                                                       un_addrlen,
4102                                                       si->family,
4103                                                       msg->msg_name,
4104                                                       &msg->msg_namelen);
4105                         if (rc == -1) {
4106                                 goto done;
4107                         }
4108
4109                         swrap_pcap_dump_packet(si,
4110                                           msg->msg_name,
4111                                           SWRAP_RECVFROM,
4112                                           buf,
4113                                           ret);
4114                 } else {
4115                         swrap_pcap_dump_packet(si,
4116                                           msg->msg_name,
4117                                           SWRAP_RECV,
4118                                           buf,
4119                                           ret);
4120                 }
4121
4122                 break;
4123         }
4124
4125         rc = 0;
4126 done:
4127         free(buf);
4128         errno = saved_errno;
4129
4130 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4131         if (rc == 0 &&
4132             msg->msg_controllen > 0 &&
4133             msg->msg_control != NULL) {
4134                 rc = swrap_msghdr_add_socket_info(si, msg);
4135                 if (rc < 0) {
4136                         return -1;
4137                 }
4138         }
4139 #endif
4140
4141         return rc;
4142 }
4143
4144 /****************************************************************************
4145  *   RECVFROM
4146  ***************************************************************************/
4147
4148 static ssize_t swrap_recvfrom(int s, void *buf, size_t len, int flags,
4149                               struct sockaddr *from, socklen_t *fromlen)
4150 {
4151         struct swrap_address from_addr = {
4152                 .sa_socklen = sizeof(struct sockaddr_un),
4153         };
4154         ssize_t ret;
4155         struct socket_info *si = find_socket_info(s);
4156         struct swrap_address saddr = {
4157                 .sa_socklen = sizeof(struct sockaddr_storage),
4158         };
4159         struct msghdr msg;
4160         struct iovec tmp;
4161         int tret;
4162
4163         if (!si) {
4164                 return libc_recvfrom(s,
4165                                      buf,
4166                                      len,
4167                                      flags,
4168                                      from,
4169                                      fromlen);
4170         }
4171
4172         tmp.iov_base = buf;
4173         tmp.iov_len = len;
4174
4175         ZERO_STRUCT(msg);
4176         if (from != NULL && fromlen != NULL) {
4177                 msg.msg_name = from;   /* optional address */
4178                 msg.msg_namelen = *fromlen; /* size of address */
4179         } else {
4180                 msg.msg_name = &saddr.sa.s; /* optional address */
4181                 msg.msg_namelen = saddr.sa_socklen; /* size of address */
4182         }
4183         msg.msg_iov = &tmp;            /* scatter/gather array */
4184         msg.msg_iovlen = 1;            /* # elements in msg_iov */
4185 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4186         msg.msg_control = NULL;        /* ancillary data, see below */
4187         msg.msg_controllen = 0;        /* ancillary data buffer len */
4188         msg.msg_flags = 0;             /* flags on received message */
4189 #endif
4190
4191         tret = swrap_recvmsg_before(s, si, &msg, &tmp);
4192         if (tret < 0) {
4193                 return -1;
4194         }
4195
4196         buf = msg.msg_iov[0].iov_base;
4197         len = msg.msg_iov[0].iov_len;
4198
4199         ret = libc_recvfrom(s,
4200                             buf,
4201                             len,
4202                             flags,
4203                             &from_addr.sa.s,
4204                             &from_addr.sa_socklen);
4205         if (ret == -1) {
4206                 return ret;
4207         }
4208
4209         tret = swrap_recvmsg_after(s,
4210                                    si,
4211                                    &msg,
4212                                    &from_addr.sa.un,
4213                                    from_addr.sa_socklen,
4214                                    ret);
4215         if (tret != 0) {
4216                 return tret;
4217         }
4218
4219         if (from != NULL && fromlen != NULL) {
4220                 *fromlen = msg.msg_namelen;
4221         }
4222
4223         return ret;
4224 }
4225
4226 #ifdef HAVE_ACCEPT_PSOCKLEN_T
4227 ssize_t recvfrom(int s, void *buf, size_t len, int flags,
4228                  struct sockaddr *from, Psocklen_t fromlen)
4229 #else
4230 ssize_t recvfrom(int s, void *buf, size_t len, int flags,
4231                  struct sockaddr *from, socklen_t *fromlen)
4232 #endif
4233 {
4234         return swrap_recvfrom(s, buf, len, flags, from, (socklen_t *)fromlen);
4235 }
4236
4237 /****************************************************************************
4238  *   SENDTO
4239  ***************************************************************************/
4240
4241 static ssize_t swrap_sendto(int s, const void *buf, size_t len, int flags,
4242                             const struct sockaddr *to, socklen_t tolen)
4243 {
4244         struct msghdr msg;
4245         struct iovec tmp;
4246         struct swrap_address un_addr = {
4247                 .sa_socklen = sizeof(struct sockaddr_un),
4248         };
4249         const struct sockaddr_un *to_un = NULL;
4250         ssize_t ret;
4251         int rc;
4252         struct socket_info *si = find_socket_info(s);
4253         int bcast = 0;
4254
4255         if (!si) {
4256                 return libc_sendto(s, buf, len, flags, to, tolen);
4257         }
4258
4259         tmp.iov_base = discard_const_p(char, buf);
4260         tmp.iov_len = len;
4261
4262         ZERO_STRUCT(msg);
4263         msg.msg_name = discard_const_p(struct sockaddr, to); /* optional address */
4264         msg.msg_namelen = tolen;       /* size of address */
4265         msg.msg_iov = &tmp;            /* scatter/gather array */
4266         msg.msg_iovlen = 1;            /* # elements in msg_iov */
4267 #if HAVE_STRUCT_MSGHDR_MSG_CONTROL
4268         msg.msg_control = NULL;        /* ancillary data, see below */
4269         msg.msg_controllen = 0;        /* ancillary data buffer len */
4270         msg.msg_flags = 0;             /* flags on received message */
4271 #endif
4272
4273         rc = swrap_sendmsg_before(s,
4274                                   si,
4275                                   &msg,
4276                                   &tmp,
4277                                   &un_addr.sa.un,
4278                                   &to_un,
4279                                   &to,
4280                                   &bcast);
4281         if (rc < 0) {
4282                 return -1;
4283         }
4284
4285         buf = msg.msg_iov[0].iov_base;
4286         len = msg.msg_iov[0].iov_len;
4287
4288         if (bcast) {
4289                 struct stat st;
4290                 unsigned int iface;
4291                 unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port);
4292                 char type;
4293
4294                 type = SOCKET_TYPE_CHAR_UDP;
4295
4296                 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
4297                         snprintf(un_addr.sa.un.sun_path,
4298                                  sizeof(un_addr.sa.un.sun_path),
4299                                  "%s/"SOCKET_FORMAT,
4300                                  socket_wrapper_dir(), type, iface, prt);
4301                         if (stat(un_addr.sa.un.sun_path, &st) != 0) continue;
4302
4303                         /* ignore the any errors in broadcast sends */
4304                         libc_sendto(s,
4305                                     buf,
4306                                     len,
4307                                     flags,
4308                                     &un_addr.sa.s,
4309                                     un_addr.sa_socklen);
4310                 }
4311
4312                 swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
4313
4314                 return len;
4315         }
4316
4317         ret = libc_sendto(s,
4318                           buf,
4319                           len,
4320                           flags,
4321                           (struct sockaddr *)msg.msg_name,
4322                           msg.msg_namelen);
4323
4324         swrap_sendmsg_after(s, si, &msg, to, ret);
4325
4326         return ret;
4327 }
4328
4329 ssize_t sendto(int s, const void *buf, size_t len, int flags,
4330                const struct sockaddr *to, socklen_t tolen)
4331 {
4332         return swrap_sendto(s, buf, len, flags, to, tolen);
4333 }
4334
4335 /****************************************************************************
4336  *   READV
4337  ***************************************************************************/
4338
4339 static ssize_t swrap_recv(int s, void *buf, size_t len, int flags)
4340 {
4341         struct socket_info *si;
4342         struct msghdr msg;
4343         struct swrap_address saddr = {
4344                 .sa_socklen = sizeof(struct sockaddr_storage),
4345         };
4346         struct iovec tmp;
4347         ssize_t ret;
4348         int tret;
4349
4350         si = find_socket_info(s);
4351         if (si == NULL) {
4352                 return libc_recv(s, buf, len, flags);
4353         }
4354
4355         tmp.iov_base = buf;
4356         tmp.iov_len = len;
4357
4358         ZERO_STRUCT(msg);
4359         msg.msg_name = &saddr.sa.s;    /* optional address */
4360         msg.msg_namelen = saddr.sa_socklen; /* size of address */
4361         msg.msg_iov = &tmp;            /* scatter/gather array */
4362         msg.msg_iovlen = 1;            /* # elements in msg_iov */
4363 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4364         msg.msg_control = NULL;        /* ancillary data, see below */
4365         msg.msg_controllen = 0;        /* ancillary data buffer len */
4366         msg.msg_flags = 0;             /* flags on received message */
4367 #endif
4368
4369         tret = swrap_recvmsg_before(s, si, &msg, &tmp);
4370         if (tret < 0) {
4371                 return -1;
4372         }
4373
4374         buf = msg.msg_iov[0].iov_base;
4375         len = msg.msg_iov[0].iov_len;
4376
4377         ret = libc_recv(s, buf, len, flags);
4378
4379         tret = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret);
4380         if (tret != 0) {
4381                 return tret;
4382         }
4383
4384         return ret;
4385 }
4386
4387 ssize_t recv(int s, void *buf, size_t len, int flags)
4388 {
4389         return swrap_recv(s, buf, len, flags);
4390 }
4391
4392 /****************************************************************************
4393  *   READ
4394  ***************************************************************************/
4395
4396 static ssize_t swrap_read(int s, void *buf, size_t len)
4397 {
4398         struct socket_info *si;
4399         struct msghdr msg;
4400         struct iovec tmp;
4401         struct swrap_address saddr = {
4402                 .sa_socklen = sizeof(struct sockaddr_storage),
4403         };
4404         ssize_t ret;
4405         int tret;
4406
4407         si = find_socket_info(s);
4408         if (si == NULL) {
4409                 return libc_read(s, buf, len);
4410         }
4411
4412         tmp.iov_base = buf;
4413         tmp.iov_len = len;
4414
4415         ZERO_STRUCT(msg);
4416         msg.msg_name = &saddr.sa.ss;   /* optional address */
4417         msg.msg_namelen = saddr.sa_socklen; /* size of address */
4418         msg.msg_iov = &tmp;            /* scatter/gather array */
4419         msg.msg_iovlen = 1;            /* # elements in msg_iov */
4420 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4421         msg.msg_control = NULL;        /* ancillary data, see below */
4422         msg.msg_controllen = 0;        /* ancillary data buffer len */
4423         msg.msg_flags = 0;             /* flags on received message */
4424 #endif
4425
4426         tret = swrap_recvmsg_before(s, si, &msg, &tmp);
4427         if (tret < 0) {
4428                 if (tret == -ENOTSOCK) {
4429                         return libc_read(s, buf, len);
4430                 }
4431                 return -1;
4432         }
4433
4434         buf = msg.msg_iov[0].iov_base;
4435         len = msg.msg_iov[0].iov_len;
4436
4437         ret = libc_read(s, buf, len);
4438
4439         tret = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret);
4440         if (tret != 0) {
4441                 return tret;
4442         }
4443
4444         return ret;
4445 }
4446
4447 ssize_t read(int s, void *buf, size_t len)
4448 {
4449         return swrap_read(s, buf, len);
4450 }
4451
4452 /****************************************************************************
4453  *   SEND
4454  ***************************************************************************/
4455
4456 static ssize_t swrap_send(int s, const void *buf, size_t len, int flags)
4457 {
4458         struct msghdr msg;
4459         struct iovec tmp;
4460         struct sockaddr_un un_addr;
4461         ssize_t ret;
4462         int rc;
4463         struct socket_info *si = find_socket_info(s);
4464
4465         if (!si) {
4466                 return libc_send(s, buf, len, flags);
4467         }
4468
4469         tmp.iov_base = discard_const_p(char, buf);
4470         tmp.iov_len = len;
4471
4472         ZERO_STRUCT(msg);
4473         msg.msg_name = NULL;           /* optional address */
4474         msg.msg_namelen = 0;           /* size of address */
4475         msg.msg_iov = &tmp;            /* scatter/gather array */
4476         msg.msg_iovlen = 1;            /* # elements in msg_iov */
4477 #if HAVE_STRUCT_MSGHDR_MSG_CONTROL
4478         msg.msg_control = NULL;        /* ancillary data, see below */
4479         msg.msg_controllen = 0;        /* ancillary data buffer len */
4480         msg.msg_flags = 0;             /* flags on received message */
4481 #endif
4482
4483         rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
4484         if (rc < 0) {
4485                 return -1;
4486         }
4487
4488         buf = msg.msg_iov[0].iov_base;
4489         len = msg.msg_iov[0].iov_len;
4490
4491         ret = libc_send(s, buf, len, flags);
4492
4493         swrap_sendmsg_after(s, si, &msg, NULL, ret);
4494
4495         return ret;
4496 }
4497
4498 ssize_t send(int s, const void *buf, size_t len, int flags)
4499 {
4500         return swrap_send(s, buf, len, flags);
4501 }
4502
4503 /****************************************************************************
4504  *   RECVMSG
4505  ***************************************************************************/
4506
4507 static ssize_t swrap_recvmsg(int s, struct msghdr *omsg, int flags)
4508 {
4509         struct swrap_address from_addr = {
4510                 .sa_socklen = sizeof(struct sockaddr_un),
4511         };
4512         struct socket_info *si;
4513         struct msghdr msg;
4514         struct iovec tmp;
4515 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4516         size_t msg_ctrllen_filled;
4517         size_t msg_ctrllen_left;
4518 #endif
4519
4520         ssize_t ret;
4521         int rc;
4522
4523         si = find_socket_info(s);
4524         if (si == NULL) {
4525                 return libc_recvmsg(s, omsg, flags);
4526         }
4527
4528         tmp.iov_base = NULL;
4529         tmp.iov_len = 0;
4530
4531         ZERO_STRUCT(msg);
4532         msg.msg_name = &from_addr.sa;              /* optional address */
4533         msg.msg_namelen = from_addr.sa_socklen;    /* size of address */
4534         msg.msg_iov = omsg->msg_iov;               /* scatter/gather array */
4535         msg.msg_iovlen = omsg->msg_iovlen;         /* # elements in msg_iov */
4536 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4537         msg_ctrllen_filled = 0;
4538         msg_ctrllen_left = omsg->msg_controllen;
4539
4540         msg.msg_control = omsg->msg_control;       /* ancillary data, see below */
4541         msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
4542         msg.msg_flags = omsg->msg_flags;           /* flags on received message */
4543 #endif
4544
4545         rc = swrap_recvmsg_before(s, si, &msg, &tmp);
4546         if (rc < 0) {
4547                 return -1;
4548         }
4549
4550         ret = libc_recvmsg(s, &msg, flags);
4551
4552         msg.msg_name = omsg->msg_name;
4553         msg.msg_namelen = omsg->msg_namelen;
4554
4555 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4556         msg_ctrllen_filled += msg.msg_controllen;
4557         msg_ctrllen_left -= msg.msg_controllen;
4558
4559         if (omsg->msg_control != NULL) {
4560                 uint8_t *p;
4561
4562                 p = omsg->msg_control;
4563                 p += msg_ctrllen_filled;
4564
4565                 msg.msg_control = p;
4566                 msg.msg_controllen = msg_ctrllen_left;
4567         } else {
4568                 msg.msg_control = NULL;
4569                 msg.msg_controllen = 0;
4570         }
4571 #endif
4572
4573         rc = swrap_recvmsg_after(s,
4574                                  si,
4575                                  &msg,
4576                                  &from_addr.sa.un,
4577                                  from_addr.sa_socklen,
4578                                  ret);
4579         if (rc != 0) {
4580                 return rc;
4581         }
4582
4583 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4584         if (omsg->msg_control != NULL) {
4585                 /* msg.msg_controllen = space left */
4586                 msg_ctrllen_left = msg.msg_controllen;
4587                 msg_ctrllen_filled = omsg->msg_controllen - msg_ctrllen_left;
4588         }
4589
4590         /* Update the original message length */
4591         omsg->msg_controllen = msg_ctrllen_filled;
4592         omsg->msg_flags = msg.msg_flags;
4593 #endif
4594         omsg->msg_iovlen = msg.msg_iovlen;
4595
4596         return ret;
4597 }
4598
4599 ssize_t recvmsg(int sockfd, struct msghdr *msg, int flags)
4600 {
4601         return swrap_recvmsg(sockfd, msg, flags);
4602 }
4603
4604 /****************************************************************************
4605  *   SENDMSG
4606  ***************************************************************************/
4607
4608 static ssize_t swrap_sendmsg(int s, const struct msghdr *omsg, int flags)
4609 {
4610         struct msghdr msg;
4611         struct iovec tmp;
4612         struct sockaddr_un un_addr;
4613         const struct sockaddr_un *to_un = NULL;
4614         const struct sockaddr *to = NULL;
4615         ssize_t ret;
4616         int rc;
4617         struct socket_info *si = find_socket_info(s);
4618         int bcast = 0;
4619
4620         if (!si) {
4621                 return libc_sendmsg(s, omsg, flags);
4622         }
4623
4624         ZERO_STRUCT(un_addr);
4625
4626         tmp.iov_base = NULL;
4627         tmp.iov_len = 0;
4628
4629         ZERO_STRUCT(msg);
4630         msg.msg_name = omsg->msg_name;             /* optional address */
4631         msg.msg_namelen = omsg->msg_namelen;       /* size of address */
4632         msg.msg_iov = omsg->msg_iov;               /* scatter/gather array */
4633         msg.msg_iovlen = omsg->msg_iovlen;         /* # elements in msg_iov */
4634 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4635         if (msg.msg_controllen > 0 && msg.msg_control != NULL) {
4636                 /* omsg is a const so use a local buffer for modifications */
4637                 uint8_t cmbuf[omsg->msg_controllen];
4638
4639                 memcpy(cmbuf, omsg->msg_control, omsg->msg_controllen);
4640
4641                 msg.msg_control = cmbuf;       /* ancillary data, see below */
4642                 msg.msg_controllen = omsg->msg_controllen; /* ancillary data buffer len */
4643         }
4644         msg.msg_flags = omsg->msg_flags;           /* flags on received message */
4645 #endif
4646
4647         rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, &to_un, &to, &bcast);
4648         if (rc < 0) {
4649                 return -1;
4650         }
4651
4652         if (bcast) {
4653                 struct stat st;
4654                 unsigned int iface;
4655                 unsigned int prt = ntohs(((const struct sockaddr_in *)(const void *)to)->sin_port);
4656                 char type;
4657                 size_t i, len = 0;
4658                 uint8_t *buf;
4659                 off_t ofs = 0;
4660                 size_t avail = 0;
4661                 size_t remain;
4662
4663                 for (i = 0; i < (size_t)msg.msg_iovlen; i++) {
4664                         avail += msg.msg_iov[i].iov_len;
4665                 }
4666
4667                 len = avail;
4668                 remain = avail;
4669
4670                 /* we capture it as one single packet */
4671                 buf = (uint8_t *)malloc(remain);
4672                 if (!buf) {
4673                         return -1;
4674                 }
4675
4676                 for (i = 0; i < (size_t)msg.msg_iovlen; i++) {
4677                         size_t this_time = MIN(remain, (size_t)msg.msg_iov[i].iov_len);
4678                         memcpy(buf + ofs,
4679                                msg.msg_iov[i].iov_base,
4680                                this_time);
4681                         ofs += this_time;
4682                         remain -= this_time;
4683                 }
4684
4685                 type = SOCKET_TYPE_CHAR_UDP;
4686
4687                 for(iface=0; iface <= MAX_WRAPPED_INTERFACES; iface++) {
4688                         snprintf(un_addr.sun_path, sizeof(un_addr.sun_path), "%s/"SOCKET_FORMAT,
4689                                  socket_wrapper_dir(), type, iface, prt);
4690                         if (stat(un_addr.sun_path, &st) != 0) continue;
4691
4692                         msg.msg_name = &un_addr;           /* optional address */
4693                         msg.msg_namelen = sizeof(un_addr); /* size of address */
4694
4695                         /* ignore the any errors in broadcast sends */
4696                         libc_sendmsg(s, &msg, flags);
4697                 }
4698
4699                 swrap_pcap_dump_packet(si, to, SWRAP_SENDTO, buf, len);
4700                 free(buf);
4701
4702                 return len;
4703         }
4704
4705         ret = libc_sendmsg(s, &msg, flags);
4706
4707         swrap_sendmsg_after(s, si, &msg, to, ret);
4708
4709         return ret;
4710 }
4711
4712 ssize_t sendmsg(int s, const struct msghdr *omsg, int flags)
4713 {
4714         return swrap_sendmsg(s, omsg, flags);
4715 }
4716
4717 /****************************************************************************
4718  *   READV
4719  ***************************************************************************/
4720
4721 static ssize_t swrap_readv(int s, const struct iovec *vector, int count)
4722 {
4723         struct socket_info *si;
4724         struct msghdr msg;
4725         struct iovec tmp;
4726         struct swrap_address saddr = {
4727                 .sa_socklen = sizeof(struct sockaddr_storage)
4728         };
4729         ssize_t ret;
4730         int rc;
4731
4732         si = find_socket_info(s);
4733         if (si == NULL) {
4734                 return libc_readv(s, vector, count);
4735         }
4736
4737         tmp.iov_base = NULL;
4738         tmp.iov_len = 0;
4739
4740         ZERO_STRUCT(msg);
4741         msg.msg_name = &saddr.sa.s; /* optional address */
4742         msg.msg_namelen = saddr.sa_socklen;      /* size of address */
4743         msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
4744         msg.msg_iovlen = count;        /* # elements in msg_iov */
4745 #ifdef HAVE_STRUCT_MSGHDR_MSG_CONTROL
4746         msg.msg_control = NULL;        /* ancillary data, see below */
4747         msg.msg_controllen = 0;        /* ancillary data buffer len */
4748         msg.msg_flags = 0;             /* flags on received message */
4749 #endif
4750
4751         rc = swrap_recvmsg_before(s, si, &msg, &tmp);
4752         if (rc < 0) {
4753                 if (rc == -ENOTSOCK) {
4754                         return libc_readv(s, vector, count);
4755                 }
4756                 return -1;
4757         }
4758
4759         ret = libc_readv(s, msg.msg_iov, msg.msg_iovlen);
4760
4761         rc = swrap_recvmsg_after(s, si, &msg, NULL, 0, ret);
4762         if (rc != 0) {
4763                 return rc;
4764         }
4765
4766         return ret;
4767 }
4768
4769 ssize_t readv(int s, const struct iovec *vector, int count)
4770 {
4771         return swrap_readv(s, vector, count);
4772 }
4773
4774 /****************************************************************************
4775  *   WRITEV
4776  ***************************************************************************/
4777
4778 static ssize_t swrap_writev(int s, const struct iovec *vector, int count)
4779 {
4780         struct msghdr msg;
4781         struct iovec tmp;
4782         struct sockaddr_un un_addr;
4783         ssize_t ret;
4784         int rc;
4785         struct socket_info *si = find_socket_info(s);
4786
4787         if (!si) {
4788                 return libc_writev(s, vector, count);
4789         }
4790
4791         tmp.iov_base = NULL;
4792         tmp.iov_len = 0;
4793
4794         ZERO_STRUCT(msg);
4795         msg.msg_name = NULL;           /* optional address */
4796         msg.msg_namelen = 0;           /* size of address */
4797         msg.msg_iov = discard_const_p(struct iovec, vector); /* scatter/gather array */
4798         msg.msg_iovlen = count;        /* # elements in msg_iov */
4799 #if HAVE_STRUCT_MSGHDR_MSG_CONTROL
4800         msg.msg_control = NULL;        /* ancillary data, see below */
4801         msg.msg_controllen = 0;        /* ancillary data buffer len */
4802         msg.msg_flags = 0;             /* flags on received message */
4803 #endif
4804
4805         rc = swrap_sendmsg_before(s, si, &msg, &tmp, &un_addr, NULL, NULL, NULL);
4806         if (rc < 0) {
4807                 if (rc == -ENOTSOCK) {
4808                         return libc_readv(s, vector, count);
4809                 }
4810                 return -1;
4811         }
4812
4813         ret = libc_writev(s, msg.msg_iov, msg.msg_iovlen);
4814
4815         swrap_sendmsg_after(s, si, &msg, NULL, ret);
4816
4817         return ret;
4818 }
4819
4820 ssize_t writev(int s, const struct iovec *vector, int count)
4821 {
4822         return swrap_writev(s, vector, count);
4823 }
4824
4825 /****************************
4826  * CLOSE
4827  ***************************/
4828
4829 static int swrap_close(int fd)
4830 {
4831         struct socket_info *si = find_socket_info(fd);
4832         struct socket_info_fd *fi;
4833         int ret;
4834
4835         if (!si) {
4836                 return libc_close(fd);
4837         }
4838
4839         for (fi = si->fds; fi; fi = fi->next) {
4840                 if (fi->fd == fd) {
4841                         SWRAP_DLIST_REMOVE(si->fds, fi);
4842                         free(fi);
4843                         break;
4844                 }
4845         }
4846
4847         if (si->fds) {
4848                 /* there are still references left */
4849                 return libc_close(fd);
4850         }
4851
4852         SWRAP_DLIST_REMOVE(sockets, si);
4853
4854         if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) {
4855                 swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_SEND, NULL, 0);
4856         }
4857
4858         ret = libc_close(fd);
4859
4860         if (si->myname.sa_socklen > 0 && si->peername.sa_socklen > 0) {
4861                 swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_RECV, NULL, 0);
4862                 swrap_pcap_dump_packet(si, NULL, SWRAP_CLOSE_ACK, NULL, 0);
4863         }
4864
4865         if (si->un_addr.sun_path[0] != '\0') {
4866                 unlink(si->un_addr.sun_path);
4867         }
4868         free(si);
4869
4870         return ret;
4871 }
4872
4873 int close(int fd)
4874 {
4875         return swrap_close(fd);
4876 }
4877
4878 /****************************
4879  * DUP
4880  ***************************/
4881
4882 static int swrap_dup(int fd)
4883 {
4884         struct socket_info *si;
4885         struct socket_info_fd *fi;
4886
4887         si = find_socket_info(fd);
4888
4889         if (!si) {
4890                 return libc_dup(fd);
4891         }
4892
4893         fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
4894         if (fi == NULL) {
4895                 errno = ENOMEM;
4896                 return -1;
4897         }
4898
4899         fi->fd = libc_dup(fd);
4900         if (fi->fd == -1) {
4901                 int saved_errno = errno;
4902                 free(fi);
4903                 errno = saved_errno;
4904                 return -1;
4905         }
4906
4907         /* Make sure we don't have an entry for the fd */
4908         swrap_remove_stale(fi->fd);
4909
4910         SWRAP_DLIST_ADD(si->fds, fi);
4911         return fi->fd;
4912 }
4913
4914 int dup(int fd)
4915 {
4916         return swrap_dup(fd);
4917 }
4918
4919 /****************************
4920  * DUP2
4921  ***************************/
4922
4923 static int swrap_dup2(int fd, int newfd)
4924 {
4925         struct socket_info *si;
4926         struct socket_info_fd *fi;
4927
4928         si = find_socket_info(fd);
4929
4930         if (!si) {
4931                 return libc_dup2(fd, newfd);
4932         }
4933
4934         if (find_socket_info(newfd)) {
4935                 /* dup2() does an implicit close of newfd, which we
4936                  * need to emulate */
4937                 swrap_close(newfd);
4938         }
4939
4940         fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
4941         if (fi == NULL) {
4942                 errno = ENOMEM;
4943                 return -1;
4944         }
4945
4946         fi->fd = libc_dup2(fd, newfd);
4947         if (fi->fd == -1) {
4948                 int saved_errno = errno;
4949                 free(fi);
4950                 errno = saved_errno;
4951                 return -1;
4952         }
4953
4954         /* Make sure we don't have an entry for the fd */
4955         swrap_remove_stale(fi->fd);
4956
4957         SWRAP_DLIST_ADD(si->fds, fi);
4958         return fi->fd;
4959 }
4960
4961 int dup2(int fd, int newfd)
4962 {
4963         return swrap_dup2(fd, newfd);
4964 }
4965
4966 /****************************
4967  * FCNTL
4968  ***************************/
4969
4970 static int swrap_vfcntl(int fd, int cmd, va_list va)
4971 {
4972         struct socket_info_fd *fi;
4973         struct socket_info *si;
4974         int rc;
4975
4976         si = find_socket_info(fd);
4977         if (si == NULL) {
4978                 rc = libc_vfcntl(fd, cmd, va);
4979
4980                 return rc;
4981         }
4982
4983         switch (cmd) {
4984         case F_DUPFD:
4985                 fi = (struct socket_info_fd *)calloc(1, sizeof(struct socket_info_fd));
4986                 if (fi == NULL) {
4987                         errno = ENOMEM;
4988                         return -1;
4989                 }
4990
4991                 fi->fd = libc_vfcntl(fd, cmd, va);
4992                 if (fi->fd == -1) {
4993                         int saved_errno = errno;
4994                         free(fi);
4995                         errno = saved_errno;
4996                         return -1;
4997                 }
4998
4999                 /* Make sure we don't have an entry for the fd */
5000                 swrap_remove_stale(fi->fd);
5001
5002                 SWRAP_DLIST_ADD(si->fds, fi);
5003
5004                 rc = fi->fd;
5005                 break;
5006         default:
5007                 rc = libc_vfcntl(fd, cmd, va);
5008                 break;
5009         }
5010
5011         return rc;
5012 }
5013
5014 int fcntl(int fd, int cmd, ...)
5015 {
5016         va_list va;
5017         int rc;
5018
5019         va_start(va, cmd);
5020
5021         rc = swrap_vfcntl(fd, cmd, va);
5022
5023         va_end(va);
5024
5025         return rc;
5026 }
5027
5028 /****************************
5029  * EVENTFD
5030  ***************************/
5031
5032 #ifdef HAVE_EVENTFD
5033 static int swrap_eventfd(int count, int flags)
5034 {
5035         int fd;
5036
5037         fd = libc_eventfd(count, flags);
5038         if (fd != -1) {
5039                 swrap_remove_stale(fd);
5040         }
5041
5042         return fd;
5043 }
5044
5045 #ifdef HAVE_EVENTFD_UNSIGNED_INT
5046 int eventfd(unsigned int count, int flags)
5047 #else
5048 int eventfd(int count, int flags)
5049 #endif
5050 {
5051         return swrap_eventfd(count, flags);
5052 }
5053 #endif
5054
5055 /****************************
5056  * DESTRUCTOR
5057  ***************************/
5058
5059 /*
5060  * This function is called when the library is unloaded and makes sure that
5061  * sockets get closed and the unix file for the socket are unlinked.
5062  */
5063 void swrap_destructor(void)
5064 {
5065         struct socket_info *s = sockets;
5066
5067         while (s != NULL) {
5068                 struct socket_info_fd *f = s->fds;
5069                 if (f != NULL) {
5070                         swrap_close(f->fd);
5071                 }
5072                 s = sockets;
5073         }
5074 }