lib/tsocket/tsocket_bsd.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Stefan Metzmacher 2009
   5
   6      ** NOTE! The following LGPL license applies to the tsocket
   7      ** library. This does NOT imply that all of Samba is released
   8      ** under the LGPL
   9
  10    This library is free software; you can redistribute it and/or
  11    modify it under the terms of the GNU Lesser General Public
  12    License as published by the Free Software Foundation; either
  13    version 3 of the License, or (at your option) any later version.
  14
  15    This library is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18    Lesser General Public License for more details.
  19
  20    You should have received a copy of the GNU Lesser General Public
  21    License along with this library; if not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "replace.h"
  25 #include "system/filesys.h"
  26 #include "system/network.h"
  27 #include "tsocket.h"
  28 #include "tsocket_internal.h"
  29
  30 static int tsocket_bsd_error_from_errno(int ret,
  31                                         int sys_errno,
  32                                         bool *retry)
  33 {
  34         *retry = false;
  35
  36         if (ret >= 0) {
  37                 return 0;
  38         }
  39
  40         if (ret != -1) {
  41                 return EIO;
  42         }
  43
  44         if (sys_errno == 0) {
  45                 return EIO;
  46         }
  47
  48         if (sys_errno == EINTR) {
  49                 *retry = true;
  50                 return sys_errno;
  51         }
  52
  53         if (sys_errno == EINPROGRESS) {
  54                 *retry = true;
  55                 return sys_errno;
  56         }
  57
  58         if (sys_errno == EAGAIN) {
  59                 *retry = true;
  60                 return sys_errno;
  61         }
  62
  63 #ifdef EWOULDBLOCK
  64         if (sys_errno == EWOULDBLOCK) {
  65                 *retry = true;
  66                 return sys_errno;
  67         }
  68 #endif
  69
  70         return sys_errno;
  71 }
  72
  73 static int tsocket_bsd_common_prepare_fd(int fd, bool high_fd)
  74 {
  75         int i;
  76         int sys_errno = 0;
  77         int fds[3];
  78         int num_fds = 0;
  79
  80         int result, flags;
  81
  82         if (fd == -1) {
  83                 return -1;
  84         }
  85
  86         /* first make a fd >= 3 */
  87         if (high_fd) {
  88                 while (fd < 3) {
  89                         fds[num_fds++] = fd;
  90                         fd = dup(fd);
  91                         if (fd == -1) {
  92                                 sys_errno = errno;
  93                                 break;
  94                         }
  95                 }
  96                 for (i=0; i<num_fds; i++) {
  97                         close(fds[i]);
  98                 }
  99                 if (fd == -1) {
 100                         errno = sys_errno;
 101                         return fd;
 102                 }
 103         }
 104
 105         /* fd should be nonblocking. */
 106
 107 #ifdef O_NONBLOCK
 108 #define FLAG_TO_SET O_NONBLOCK
 109 #else
 110 #ifdef SYSV
 111 #define FLAG_TO_SET O_NDELAY
 112 #else /* BSD */
 113 #define FLAG_TO_SET FNDELAY
 114 #endif
 115 #endif
 116
 117         if ((flags = fcntl(fd, F_GETFL)) == -1) {
 118                 goto fail;
 119         }
 120
 121         flags |= FLAG_TO_SET;
 122         if (fcntl(fd, F_SETFL, flags) == -1) {
 123                 goto fail;
 124         }
 125
 126 #undef FLAG_TO_SET
 127
 128         /* fd should be closed on exec() */
 129 #ifdef FD_CLOEXEC
 130         result = flags = fcntl(fd, F_GETFD, 0);
 131         if (flags >= 0) {
 132                 flags |= FD_CLOEXEC;
 133                 result = fcntl(fd, F_SETFD, flags);
 134         }
 135         if (result < 0) {
 136                 goto fail;
 137         }
 138 #endif
 139         return fd;
 140
 141  fail:
 142         if (fd != -1) {
 143                 sys_errno = errno;
 144                 close(fd);
 145                 errno = sys_errno;
 146         }
 147         return -1;
 148 }
 149
 150 static ssize_t tsocket_bsd_pending(int fd)
 151 {
 152         int ret, error;
 153         int value = 0;
 154         socklen_t len;
 155
 156         ret = ioctl(fd, FIONREAD, &value);
 157         if (ret == -1) {
 158                 return ret;
 159         }
 160
 161         if (ret != 0) {
 162                 /* this should not be reached */
 163                 errno = EIO;
 164                 return -1;
 165         }
 166
 167         if (value != 0) {
 168                 return value;
 169         }
 170
 171         error = 0;
 172         len = sizeof(error);
 173
 174         /*
 175          * if no data is available check if the socket is in error state. For
 176          * dgram sockets it's the way to return ICMP error messages of
 177          * connected sockets to the caller.
 178          */
 179         ret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &error, &len);
 180         if (ret == -1) {
 181                 return ret;
 182         }
 183         if (error != 0) {
 184                 errno = error;
 185                 return -1;
 186         }
 187         return 0;
 188 }
 189
 190 static const struct tsocket_address_ops tsocket_address_bsd_ops;
 191
 192 struct tsocket_address_bsd {
 193         union {
 194                 struct sockaddr sa;
 195                 struct sockaddr_in in;
 196 #ifdef HAVE_IPV6
 197                 struct sockaddr_in6 in6;
 198 #endif
 199                 struct sockaddr_un un;
 200                 struct sockaddr_storage ss;
 201         } u;
 202 };
 203
 204 int _tsocket_address_bsd_from_sockaddr(TALLOC_CTX *mem_ctx,
 205                                        struct sockaddr *sa,
 206                                        size_t sa_socklen,
 207                                        struct tsocket_address **_addr,
 208                                        const char *location)
 209 {
 210         struct tsocket_address *addr;
 211         struct tsocket_address_bsd *bsda;
 212
 213         if (sa_socklen < sizeof(sa->sa_family)) {
 214                 errno = EINVAL;
 215                 return -1;
 216         }
 217
 218         switch (sa->sa_family) {
 219         case AF_UNIX:
 220                 if (sa_socklen > sizeof(struct sockaddr_un)) {
 221                         sa_socklen = sizeof(struct sockaddr_un);
 222                 }
 223                 break;
 224         case AF_INET:
 225                 if (sa_socklen < sizeof(struct sockaddr_in)) {
 226                         errno = EINVAL;
 227                         return -1;
 228                 }
 229                 sa_socklen = sizeof(struct sockaddr_in);
 230                 break;
 231 #ifdef HAVE_IPV6
 232         case AF_INET6:
 233                 if (sa_socklen < sizeof(struct sockaddr_in6)) {
 234                         errno = EINVAL;
 235                         return -1;
 236                 }
 237                 sa_socklen = sizeof(struct sockaddr_in6);
 238                 break;
 239 #endif
 240         default:
 241                 errno = EAFNOSUPPORT;
 242                 return -1;
 243         }
 244
 245         if (sa_socklen > sizeof(struct sockaddr_storage)) {
 246                 errno = EINVAL;
 247                 return -1;
 248         }
 249
 250         addr = tsocket_address_create(mem_ctx,
 251                                       &tsocket_address_bsd_ops,
 252                                       &bsda,
 253                                       struct tsocket_address_bsd,
 254                                       location);
 255         if (!addr) {
 256                 errno = ENOMEM;
 257                 return -1;
 258         }
 259
 260         ZERO_STRUCTP(bsda);
 261
 262         memcpy(&bsda->u.ss, sa, sa_socklen);
 263
 264         *_addr = addr;
 265         return 0;
 266 }
 267
 268 ssize_t tsocket_address_bsd_sockaddr(const struct tsocket_address *addr,
 269                                      struct sockaddr *sa,
 270                                      size_t sa_socklen)
 271 {
 272         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 273                                            struct tsocket_address_bsd);
 274         ssize_t rlen = 0;
 275
 276         if (!bsda) {
 277                 errno = EINVAL;
 278                 return -1;
 279         }
 280
 281         switch (bsda->u.sa.sa_family) {
 282         case AF_UNIX:
 283                 rlen = sizeof(struct sockaddr_un);
 284                 break;
 285         case AF_INET:
 286                 rlen = sizeof(struct sockaddr_in);
 287                 break;
 288 #ifdef HAVE_IPV6
 289         case AF_INET6:
 290                 rlen = sizeof(struct sockaddr_in6);
 291                 break;
 292 #endif
 293         default:
 294                 errno = EAFNOSUPPORT;
 295                 return -1;
 296         }
 297
 298         if (sa_socklen < rlen) {
 299                 errno = EINVAL;
 300                 return -1;
 301         }
 302
 303         if (sa_socklen > sizeof(struct sockaddr_storage)) {
 304                 memset(sa, 0, sa_socklen);
 305                 sa_socklen = sizeof(struct sockaddr_storage);
 306         }
 307
 308         memcpy(sa, &bsda->u.ss, sa_socklen);
 309         return rlen;
 310 }
 311
 312 int _tsocket_address_inet_from_strings(TALLOC_CTX *mem_ctx,
 313                                        const char *fam,
 314                                        const char *addr,
 315                                        uint16_t port,
 316                                        struct tsocket_address **_addr,
 317                                        const char *location)
 318 {
 319         struct addrinfo hints;
 320         struct addrinfo *result = NULL;
 321         char port_str[6];
 322         int ret;
 323
 324         ZERO_STRUCT(hints);
 325         /*
 326          * we use SOCKET_STREAM here to get just one result
 327          * back from getaddrinfo().
 328          */
 329         hints.ai_socktype = SOCK_STREAM;
 330         hints.ai_flags = AI_NUMERICHOST | AI_NUMERICSERV;
 331
 332         if (strcasecmp(fam, "ip") == 0) {
 333                 hints.ai_family = AF_UNSPEC;
 334                 if (!addr) {
 335 #ifdef HAVE_IPV6
 336                         addr = "::";
 337 #else
 338                         addr = "0.0.0.0";
 339 #endif
 340                 }
 341         } else if (strcasecmp(fam, "ipv4") == 0) {
 342                 hints.ai_family = AF_INET;
 343                 if (!addr) {
 344                         addr = "0.0.0.0";
 345                 }
 346 #ifdef HAVE_IPV6
 347         } else if (strcasecmp(fam, "ipv6") == 0) {
 348                 hints.ai_family = AF_INET6;
 349                 if (!addr) {
 350                         addr = "::";
 351                 }
 352 #endif
 353         } else {
 354                 errno = EAFNOSUPPORT;
 355                 return -1;
 356         }
 357
 358         snprintf(port_str, sizeof(port_str) - 1, "%u", port);
 359
 360         ret = getaddrinfo(addr, port_str, &hints, &result);
 361         if (ret != 0) {
 362                 switch (ret) {
 363                 case EAI_FAIL:
 364                         errno = EINVAL;
 365                         break;
 366                 }
 367                 ret = -1;
 368                 goto done;
 369         }
 370
 371         if (result->ai_socktype != SOCK_STREAM) {
 372                 errno = EINVAL;
 373                 ret = -1;
 374                 goto done;
 375         }
 376
 377         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 378                                                   result->ai_addr,
 379                                                   result->ai_addrlen,
 380                                                   _addr,
 381                                                   location);
 382
 383 done:
 384         if (result) {
 385                 freeaddrinfo(result);
 386         }
 387         return ret;
 388 }
 389
 390 char *tsocket_address_inet_addr_string(const struct tsocket_address *addr,
 391                                        TALLOC_CTX *mem_ctx)
 392 {
 393         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 394                                            struct tsocket_address_bsd);
 395         char addr_str[INET6_ADDRSTRLEN+1];
 396         const char *str;
 397
 398         if (!bsda) {
 399                 errno = EINVAL;
 400                 return NULL;
 401         }
 402
 403         switch (bsda->u.sa.sa_family) {
 404         case AF_INET:
 405                 str = inet_ntop(bsda->u.in.sin_family,
 406                                 &bsda->u.in.sin_addr,
 407                                 addr_str, sizeof(addr_str));
 408                 break;
 409 #ifdef HAVE_IPV6
 410         case AF_INET6:
 411                 str = inet_ntop(bsda->u.in6.sin6_family,
 412                                 &bsda->u.in6.sin6_addr,
 413                                 addr_str, sizeof(addr_str));
 414                 break;
 415 #endif
 416         default:
 417                 errno = EINVAL;
 418                 return NULL;
 419         }
 420
 421         if (!str) {
 422                 return NULL;
 423         }
 424
 425         return talloc_strdup(mem_ctx, str);
 426 }
 427
 428 uint16_t tsocket_address_inet_port(const struct tsocket_address *addr)
 429 {
 430         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 431                                            struct tsocket_address_bsd);
 432         uint16_t port = 0;
 433
 434         if (!bsda) {
 435                 errno = EINVAL;
 436                 return 0;
 437         }
 438
 439         switch (bsda->u.sa.sa_family) {
 440         case AF_INET:
 441                 port = ntohs(bsda->u.in.sin_port);
 442                 break;
 443 #ifdef HAVE_IPV6
 444         case AF_INET6:
 445                 port = ntohs(bsda->u.in6.sin6_port);
 446                 break;
 447 #endif
 448         default:
 449                 errno = EINVAL;
 450                 return 0;
 451         }
 452
 453         return port;
 454 }
 455
 456 int tsocket_address_inet_set_port(struct tsocket_address *addr,
 457                                   uint16_t port)
 458 {
 459         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 460                                            struct tsocket_address_bsd);
 461
 462         if (!bsda) {
 463                 errno = EINVAL;
 464                 return -1;
 465         }
 466
 467         switch (bsda->u.sa.sa_family) {
 468         case AF_INET:
 469                 bsda->u.in.sin_port = htons(port);
 470                 break;
 471 #ifdef HAVE_IPV6
 472         case AF_INET6:
 473                 bsda->u.in6.sin6_port = htons(port);
 474                 break;
 475 #endif
 476         default:
 477                 errno = EINVAL;
 478                 return -1;
 479         }
 480
 481         return 0;
 482 }
 483
 484 int _tsocket_address_unix_from_path(TALLOC_CTX *mem_ctx,
 485                                     const char *path,
 486                                     struct tsocket_address **_addr,
 487                                     const char *location)
 488 {
 489         struct sockaddr_un un;
 490         void *p = &un;
 491         int ret;
 492
 493         if (!path) {
 494                 path = "";
 495         }
 496
 497         if (strlen(path) > sizeof(un.sun_path)-1) {
 498                 errno = ENAMETOOLONG;
 499                 return -1;
 500         }
 501
 502         ZERO_STRUCT(un);
 503         un.sun_family = AF_UNIX;
 504         strncpy(un.sun_path, path, sizeof(un.sun_path)-1);
 505
 506         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 507                                                  (struct sockaddr *)p,
 508                                                  sizeof(un),
 509                                                  _addr,
 510                                                  location);
 511
 512         return ret;
 513 }
 514
 515 char *tsocket_address_unix_path(const struct tsocket_address *addr,
 516                                 TALLOC_CTX *mem_ctx)
 517 {
 518         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 519                                            struct tsocket_address_bsd);
 520         const char *str;
 521
 522         if (!bsda) {
 523                 errno = EINVAL;
 524                 return NULL;
 525         }
 526
 527         switch (bsda->u.sa.sa_family) {
 528         case AF_UNIX:
 529                 str = bsda->u.un.sun_path;
 530                 break;
 531         default:
 532                 errno = EINVAL;
 533                 return NULL;
 534         }
 535
 536         return talloc_strdup(mem_ctx, str);
 537 }
 538
 539 static char *tsocket_address_bsd_string(const struct tsocket_address *addr,
 540                                         TALLOC_CTX *mem_ctx)
 541 {
 542         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 543                                            struct tsocket_address_bsd);
 544         char *str;
 545         char *addr_str;
 546         const char *prefix = NULL;
 547         uint16_t port;
 548
 549         switch (bsda->u.sa.sa_family) {
 550         case AF_UNIX:
 551                 return talloc_asprintf(mem_ctx, "unix:%s",
 552                                        bsda->u.un.sun_path);
 553         case AF_INET:
 554                 prefix = "ipv4";
 555                 break;
 556 #ifdef HAVE_IPV6
 557         case AF_INET6:
 558                 prefix = "ipv6";
 559                 break;
 560 #endif
 561         default:
 562                 errno = EINVAL;
 563                 return NULL;
 564         }
 565
 566         addr_str = tsocket_address_inet_addr_string(addr, mem_ctx);
 567         if (!addr_str) {
 568                 return NULL;
 569         }
 570
 571         port = tsocket_address_inet_port(addr);
 572
 573         str = talloc_asprintf(mem_ctx, "%s:%s:%u",
 574                               prefix, addr_str, port);
 575         talloc_free(addr_str);
 576
 577         return str;
 578 }
 579
 580 static struct tsocket_address *tsocket_address_bsd_copy(const struct tsocket_address *addr,
 581                                                          TALLOC_CTX *mem_ctx,
 582                                                          const char *location)
 583 {
 584         struct tsocket_address_bsd *bsda = talloc_get_type(addr->private_data,
 585                                            struct tsocket_address_bsd);
 586         struct tsocket_address *copy;
 587         int ret;
 588
 589         ret = _tsocket_address_bsd_from_sockaddr(mem_ctx,
 590                                                  &bsda->u.sa,
 591                                                  sizeof(bsda->u.ss),
 592                                                  &copy,
 593                                                  location);
 594         if (ret != 0) {
 595                 return NULL;
 596         }
 597
 598         return copy;
 599 }
 600
 601 static const struct tsocket_address_ops tsocket_address_bsd_ops = {
 602         .name           = "bsd",
 603         .string         = tsocket_address_bsd_string,
 604         .copy           = tsocket_address_bsd_copy,
 605 };
 606
 607 struct tdgram_bsd {
 608         int fd;
 609
 610         void *event_ptr;
 611         struct tevent_fd *fde;
 612
 613         void *readable_private;
 614         void (*readable_handler)(void *private_data);
 615         void *writeable_private;
 616         void (*writeable_handler)(void *private_data);
 617 };
 618
 619 static void tdgram_bsd_fde_handler(struct tevent_context *ev,
 620                                    struct tevent_fd *fde,
 621                                    uint16_t flags,
 622                                    void *private_data)
 623 {
 624         struct tdgram_bsd *bsds = talloc_get_type_abort(private_data,
 625                                   struct tdgram_bsd);
 626
 627         if (flags & TEVENT_FD_WRITE) {
 628                 bsds->writeable_handler(bsds->writeable_private);
 629                 return;
 630         }
 631         if (flags & TEVENT_FD_READ) {
 632                 if (!bsds->readable_handler) {
 633                         TEVENT_FD_NOT_READABLE(bsds->fde);
 634                         return;
 635                 }
 636                 bsds->readable_handler(bsds->readable_private);
 637                 return;
 638         }
 639 }
 640
 641 static int tdgram_bsd_set_readable_handler(struct tdgram_bsd *bsds,
 642                                            struct tevent_context *ev,
 643                                            void (*handler)(void *private_data),
 644                                            void *private_data)
 645 {
 646         if (ev == NULL) {
 647                 if (handler) {
 648                         errno = EINVAL;
 649                         return -1;
 650                 }
 651                 if (!bsds->readable_handler) {
 652                         return 0;
 653                 }
 654                 bsds->readable_handler = NULL;
 655                 bsds->readable_private = NULL;
 656
 657                 return 0;
 658         }
 659
 660         /* read and write must use the same tevent_context */
 661         if (bsds->event_ptr != ev) {
 662                 if (bsds->readable_handler || bsds->writeable_handler) {
 663                         errno = EINVAL;
 664                         return -1;
 665                 }
 666                 bsds->event_ptr = NULL;
 667                 TALLOC_FREE(bsds->fde);
 668         }
 669
 670         if (tevent_fd_get_flags(bsds->fde) == 0) {
 671                 TALLOC_FREE(bsds->fde);
 672
 673                 bsds->fde = tevent_add_fd(ev, bsds,
 674                                           bsds->fd, TEVENT_FD_READ,
 675                                           tdgram_bsd_fde_handler,
 676                                           bsds);
 677                 if (!bsds->fde) {
 678                         errno = ENOMEM;
 679                         return -1;
 680                 }
 681
 682                 /* cache the event context we're running on */
 683                 bsds->event_ptr = ev;
 684         } else if (!bsds->readable_handler) {
 685                 TEVENT_FD_READABLE(bsds->fde);
 686         }
 687
 688         bsds->readable_handler = handler;
 689         bsds->readable_private = private_data;
 690
 691         return 0;
 692 }
 693
 694 static int tdgram_bsd_set_writeable_handler(struct tdgram_bsd *bsds,
 695                                             struct tevent_context *ev,
 696                                             void (*handler)(void *private_data),
 697                                             void *private_data)
 698 {
 699         if (ev == NULL) {
 700                 if (handler) {
 701                         errno = EINVAL;
 702                         return -1;
 703                 }
 704                 if (!bsds->writeable_handler) {
 705                         return 0;
 706                 }
 707                 bsds->writeable_handler = NULL;
 708                 bsds->writeable_private = NULL;
 709                 TEVENT_FD_NOT_WRITEABLE(bsds->fde);
 710
 711                 return 0;
 712         }
 713
 714         /* read and write must use the same tevent_context */
 715         if (bsds->event_ptr != ev) {
 716                 if (bsds->readable_handler || bsds->writeable_handler) {
 717                         errno = EINVAL;
 718                         return -1;
 719                 }
 720                 bsds->event_ptr = NULL;
 721                 TALLOC_FREE(bsds->fde);
 722         }
 723
 724         if (tevent_fd_get_flags(bsds->fde) == 0) {
 725                 TALLOC_FREE(bsds->fde);
 726
 727                 bsds->fde = tevent_add_fd(ev, bsds,
 728                                           bsds->fd, TEVENT_FD_WRITE,
 729                                           tdgram_bsd_fde_handler,
 730                                           bsds);
 731                 if (!bsds->fde) {
 732                         errno = ENOMEM;
 733                         return -1;
 734                 }
 735
 736                 /* cache the event context we're running on */
 737                 bsds->event_ptr = ev;
 738         } else if (!bsds->writeable_handler) {
 739                 TEVENT_FD_WRITEABLE(bsds->fde);
 740         }
 741
 742         bsds->writeable_handler = handler;
 743         bsds->writeable_private = private_data;
 744
 745         return 0;
 746 }
 747
 748 struct tdgram_bsd_recvfrom_state {
 749         struct tdgram_context *dgram;
 750
 751         uint8_t *buf;
 752         size_t len;
 753         struct tsocket_address *src;
 754 };
 755
 756 static int tdgram_bsd_recvfrom_destructor(struct tdgram_bsd_recvfrom_state *state)
 757 {
 758         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 759                                   struct tdgram_bsd);
 760
 761         tdgram_bsd_set_readable_handler(bsds, NULL, NULL, NULL);
 762
 763         return 0;
 764 }
 765
 766 static void tdgram_bsd_recvfrom_handler(void *private_data);
 767
 768 static struct tevent_req *tdgram_bsd_recvfrom_send(TALLOC_CTX *mem_ctx,
 769                                         struct tevent_context *ev,
 770                                         struct tdgram_context *dgram)
 771 {
 772         struct tevent_req *req;
 773         struct tdgram_bsd_recvfrom_state *state;
 774         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 775         int ret;
 776
 777         req = tevent_req_create(mem_ctx, &state,
 778                                 struct tdgram_bsd_recvfrom_state);
 779         if (!req) {
 780                 return NULL;
 781         }
 782
 783         state->dgram    = dgram;
 784         state->buf      = NULL;
 785         state->len      = 0;
 786         state->src      = NULL;
 787
 788         talloc_set_destructor(state, tdgram_bsd_recvfrom_destructor);
 789
 790         if (bsds->fd == -1) {
 791                 tevent_req_error(req, ENOTCONN);
 792                 goto post;
 793         }
 794
 795         /*
 796          * this is a fast path, not waiting for the
 797          * socket to become explicit readable gains
 798          * about 10%-20% performance in benchmark tests.
 799          */
 800         tdgram_bsd_recvfrom_handler(req);
 801         if (!tevent_req_is_in_progress(req)) {
 802                 goto post;
 803         }
 804
 805         ret = tdgram_bsd_set_readable_handler(bsds, ev,
 806                                               tdgram_bsd_recvfrom_handler,
 807                                               req);
 808         if (ret == -1) {
 809                 tevent_req_error(req, errno);
 810                 goto post;
 811         }
 812
 813         return req;
 814
 815  post:
 816         tevent_req_post(req, ev);
 817         return req;
 818 }
 819
 820 static void tdgram_bsd_recvfrom_handler(void *private_data)
 821 {
 822         struct tevent_req *req = talloc_get_type_abort(private_data,
 823                                  struct tevent_req);
 824         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 825                                         struct tdgram_bsd_recvfrom_state);
 826         struct tdgram_context *dgram = state->dgram;
 827         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 828         struct tsocket_address_bsd *bsda;
 829         ssize_t ret;
 830         struct sockaddr *sa = NULL;
 831         socklen_t sa_socklen = 0;
 832         int err;
 833         bool retry;
 834
 835         ret = tsocket_bsd_pending(bsds->fd);
 836         if (ret == 0) {
 837                 /* retry later */
 838                 return;
 839         }
 840         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 841         if (retry) {
 842                 /* retry later */
 843                 return;
 844         }
 845         if (tevent_req_error(req, err)) {
 846                 return;
 847         }
 848
 849         state->buf = talloc_array(state, uint8_t, ret);
 850         if (tevent_req_nomem(state->buf, req)) {
 851                 return;
 852         }
 853         state->len = ret;
 854
 855         state->src = tsocket_address_create(state,
 856                                             &tsocket_address_bsd_ops,
 857                                             &bsda,
 858                                             struct tsocket_address_bsd,
 859                                             __location__ "bsd_recvfrom");
 860         if (tevent_req_nomem(state->src, req)) {
 861                 return;
 862         }
 863
 864         ZERO_STRUCTP(bsda);
 865
 866         sa = &bsda->u.sa;
 867         sa_socklen = sizeof(bsda->u.ss);
 868         /*
 869          * for unix sockets we can't use the size of sockaddr_storage
 870          * we would get EINVAL
 871          */
 872         if (bsda->u.sa.sa_family == AF_UNIX) {
 873                 sa_socklen = sizeof(bsda->u.un);
 874         }
 875
 876         ret = recvfrom(bsds->fd, state->buf, state->len, 0, sa, &sa_socklen);
 877         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
 878         if (retry) {
 879                 /* retry later */
 880                 return;
 881         }
 882         if (tevent_req_error(req, err)) {
 883                 return;
 884         }
 885
 886         if (ret != state->len) {
 887                 tevent_req_error(req, EIO);
 888                 return;
 889         }
 890
 891         tevent_req_done(req);
 892 }
 893
 894 static ssize_t tdgram_bsd_recvfrom_recv(struct tevent_req *req,
 895                                         int *perrno,
 896                                         TALLOC_CTX *mem_ctx,
 897                                         uint8_t **buf,
 898                                         struct tsocket_address **src)
 899 {
 900         struct tdgram_bsd_recvfrom_state *state = tevent_req_data(req,
 901                                         struct tdgram_bsd_recvfrom_state);
 902         ssize_t ret;
 903
 904         ret = tsocket_simple_int_recv(req, perrno);
 905         if (ret == 0) {
 906                 *buf = talloc_move(mem_ctx, &state->buf);
 907                 ret = state->len;
 908                 if (src) {
 909                         *src = talloc_move(mem_ctx, &state->src);
 910                 }
 911         }
 912
 913         tevent_req_received(req);
 914         return ret;
 915 }
 916
 917 struct tdgram_bsd_sendto_state {
 918         struct tdgram_context *dgram;
 919
 920         const uint8_t *buf;
 921         size_t len;
 922         const struct tsocket_address *dst;
 923
 924         ssize_t ret;
 925 };
 926
 927 static int tdgram_bsd_sendto_destructor(struct tdgram_bsd_sendto_state *state)
 928 {
 929         struct tdgram_bsd *bsds = tdgram_context_data(state->dgram,
 930                                   struct tdgram_bsd);
 931
 932         tdgram_bsd_set_writeable_handler(bsds, NULL, NULL, NULL);
 933
 934         return 0;
 935 }
 936
 937 static void tdgram_bsd_sendto_handler(void *private_data);
 938
 939 static struct tevent_req *tdgram_bsd_sendto_send(TALLOC_CTX *mem_ctx,
 940                                                  struct tevent_context *ev,
 941                                                  struct tdgram_context *dgram,
 942                                                  const uint8_t *buf,
 943                                                  size_t len,
 944                                                  const struct tsocket_address *dst)
 945 {
 946         struct tevent_req *req;
 947         struct tdgram_bsd_sendto_state *state;
 948         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
 949         int ret;
 950
 951         req = tevent_req_create(mem_ctx, &state,
 952                                 struct tdgram_bsd_sendto_state);
 953         if (!req) {
 954                 return NULL;
 955         }
 956
 957         state->dgram    = dgram;
 958         state->buf      = buf;
 959         state->len      = len;
 960         state->dst      = dst;
 961         state->ret      = -1;
 962
 963         talloc_set_destructor(state, tdgram_bsd_sendto_destructor);
 964
 965         if (bsds->fd == -1) {
 966                 tevent_req_error(req, ENOTCONN);
 967                 goto post;
 968         }
 969
 970         /*
 971          * this is a fast path, not waiting for the
 972          * socket to become explicit writeable gains
 973          * about 10%-20% performance in benchmark tests.
 974          */
 975         tdgram_bsd_sendto_handler(req);
 976         if (!tevent_req_is_in_progress(req)) {
 977                 goto post;
 978         }
 979
 980         ret = tdgram_bsd_set_writeable_handler(bsds, ev,
 981                                                tdgram_bsd_sendto_handler,
 982                                                req);
 983         if (ret == -1) {
 984                 tevent_req_error(req, errno);
 985                 goto post;
 986         }
 987
 988         return req;
 989
 990  post:
 991         tevent_req_post(req, ev);
 992         return req;
 993 }
 994
 995 static void tdgram_bsd_sendto_handler(void *private_data)
 996 {
 997         struct tevent_req *req = talloc_get_type_abort(private_data,
 998                                  struct tevent_req);
 999         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
1000                                         struct tdgram_bsd_sendto_state);
1001         struct tdgram_context *dgram = state->dgram;
1002         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
1003         struct sockaddr *sa = NULL;
1004         socklen_t sa_socklen = 0;
1005         ssize_t ret;
1006         int err;
1007         bool retry;
1008
1009         if (state->dst) {
1010                 struct tsocket_address_bsd *bsda =
1011                         talloc_get_type(state->dst->private_data,
1012                         struct tsocket_address_bsd);
1013
1014                 sa = &bsda->u.sa;
1015                 sa_socklen = sizeof(bsda->u.ss);
1016                 /*
1017                  * for unix sockets we can't use the size of sockaddr_storage
1018                  * we would get EINVAL
1019                  */
1020                 if (bsda->u.sa.sa_family == AF_UNIX) {
1021                         sa_socklen = sizeof(bsda->u.un);
1022                 }
1023         }
1024
1025         ret = sendto(bsds->fd, state->buf, state->len, 0, sa, sa_socklen);
1026         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
1027         if (retry) {
1028                 /* retry later */
1029                 return;
1030         }
1031         if (tevent_req_error(req, err)) {
1032                 return;
1033         }
1034
1035         state->ret = ret;
1036
1037         tevent_req_done(req);
1038 }
1039
1040 static ssize_t tdgram_bsd_sendto_recv(struct tevent_req *req, int *perrno)
1041 {
1042         struct tdgram_bsd_sendto_state *state = tevent_req_data(req,
1043                                         struct tdgram_bsd_sendto_state);
1044         ssize_t ret;
1045
1046         ret = tsocket_simple_int_recv(req, perrno);
1047         if (ret == 0) {
1048                 ret = state->ret;
1049         }
1050
1051         tevent_req_received(req);
1052         return ret;
1053 }
1054
1055 struct tdgram_bsd_disconnect_state {
1056         uint8_t __dummy;
1057 };
1058
1059 static struct tevent_req *tdgram_bsd_disconnect_send(TALLOC_CTX *mem_ctx,
1060                                                      struct tevent_context *ev,
1061                                                      struct tdgram_context *dgram)
1062 {
1063         struct tdgram_bsd *bsds = tdgram_context_data(dgram, struct tdgram_bsd);
1064         struct tevent_req *req;
1065         struct tdgram_bsd_disconnect_state *state;
1066         int ret;
1067         int err;
1068         bool dummy;
1069
1070         req = tevent_req_create(mem_ctx, &state,
1071                                 struct tdgram_bsd_disconnect_state);
1072         if (req == NULL) {
1073                 return NULL;
1074         }
1075
1076         if (bsds->fd == -1) {
1077                 tevent_req_error(req, ENOTCONN);
1078                 goto post;
1079         }
1080
1081         ret = close(bsds->fd);
1082         bsds->fd = -1;
1083         err = tsocket_bsd_error_from_errno(ret, errno, &dummy);
1084         if (tevent_req_error(req, err)) {
1085                 goto post;
1086         }
1087
1088         tevent_req_done(req);
1089 post:
1090         tevent_req_post(req, ev);
1091         return req;
1092 }
1093
1094 static int tdgram_bsd_disconnect_recv(struct tevent_req *req,
1095                                       int *perrno)
1096 {
1097         int ret;
1098
1099         ret = tsocket_simple_int_recv(req, perrno);
1100
1101         tevent_req_received(req);
1102         return ret;
1103 }
1104
1105 static const struct tdgram_context_ops tdgram_bsd_ops = {
1106         .name                   = "bsd",
1107
1108         .recvfrom_send          = tdgram_bsd_recvfrom_send,
1109         .recvfrom_recv          = tdgram_bsd_recvfrom_recv,
1110
1111         .sendto_send            = tdgram_bsd_sendto_send,
1112         .sendto_recv            = tdgram_bsd_sendto_recv,
1113
1114         .disconnect_send        = tdgram_bsd_disconnect_send,
1115         .disconnect_recv        = tdgram_bsd_disconnect_recv,
1116 };
1117
1118 static int tdgram_bsd_destructor(struct tdgram_bsd *bsds)
1119 {
1120         TALLOC_FREE(bsds->fde);
1121         if (bsds->fd != -1) {
1122                 close(bsds->fd);
1123                 bsds->fd = -1;
1124         }
1125         return 0;
1126 }
1127
1128 static int tdgram_bsd_dgram_socket(const struct tsocket_address *local,
1129                                    const struct tsocket_address *remote,
1130                                    bool broadcast,
1131                                    TALLOC_CTX *mem_ctx,
1132                                    struct tdgram_context **_dgram,
1133                                    const char *location)
1134 {
1135         struct tsocket_address_bsd *lbsda =
1136                 talloc_get_type_abort(local->private_data,
1137                 struct tsocket_address_bsd);
1138         struct tsocket_address_bsd *rbsda = NULL;
1139         struct tdgram_context *dgram;
1140         struct tdgram_bsd *bsds;
1141         int fd;
1142         int ret;
1143         bool do_bind = false;
1144         bool do_reuseaddr = false;
1145         socklen_t sa_socklen = sizeof(lbsda->u.ss);
1146
1147         if (remote) {
1148                 rbsda = talloc_get_type_abort(remote->private_data,
1149                         struct tsocket_address_bsd);
1150         }
1151
1152         switch (lbsda->u.sa.sa_family) {
1153         case AF_UNIX:
1154                 if (broadcast) {
1155                         errno = EINVAL;
1156                         return -1;
1157                 }
1158                 if (lbsda->u.un.sun_path[0] != 0) {
1159                         do_reuseaddr = true;
1160                         do_bind = true;
1161                 }
1162                 /*
1163                  * for unix sockets we can't use the size of sockaddr_storage
1164                  * we would get EINVAL
1165                  */
1166                 sa_socklen = sizeof(lbsda->u.un);
1167                 break;
1168         case AF_INET:
1169                 if (lbsda->u.in.sin_port != 0) {
1170                         do_reuseaddr = true;
1171                         do_bind = true;
1172                 }
1173                 if (lbsda->u.in.sin_addr.s_addr != INADDR_ANY) {
1174                         do_bind = true;
1175                 }
1176                 break;
1177 #ifdef HAVE_IPV6
1178         case AF_INET6:
1179                 if (lbsda->u.in6.sin6_port != 0) {
1180                         do_reuseaddr = true;
1181                         do_bind = true;
1182                 }
1183                 if (memcmp(&in6addr_any,
1184                            &lbsda->u.in6.sin6_addr,
1185                            sizeof(in6addr_any)) != 0) {
1186                         do_bind = true;
1187                 }
1188                 break;
1189 #endif
1190         default:
1191                 errno = EINVAL;
1192                 return -1;
1193         }
1194
1195         fd = socket(lbsda->u.sa.sa_family, SOCK_DGRAM, 0);
1196         if (fd < 0) {
1197                 return fd;
1198         }
1199
1200         fd = tsocket_bsd_common_prepare_fd(fd, true);
1201         if (fd < 0) {
1202                 return fd;
1203         }
1204
1205         dgram = tdgram_context_create(mem_ctx,
1206                                       &tdgram_bsd_ops,
1207                                       &bsds,
1208                                       struct tdgram_bsd,
1209                                       location);
1210         if (!dgram) {
1211                 int saved_errno = errno;
1212                 close(fd);
1213                 errno = saved_errno;
1214                 return -1;
1215         }
1216         ZERO_STRUCTP(bsds);
1217         bsds->fd = fd;
1218         talloc_set_destructor(bsds, tdgram_bsd_destructor);
1219
1220         if (broadcast) {
1221                 int val = 1;
1222
1223                 ret = setsockopt(fd, SOL_SOCKET, SO_BROADCAST,
1224                                  (const void *)&val, sizeof(val));
1225                 if (ret == -1) {
1226                         int saved_errno = errno;
1227                         talloc_free(dgram);
1228                         errno = saved_errno;
1229                         return ret;
1230                 }
1231         }
1232
1233         if (do_reuseaddr) {
1234                 int val = 1;
1235
1236                 ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
1237                                  (const void *)&val, sizeof(val));
1238                 if (ret == -1) {
1239                         int saved_errno = errno;
1240                         talloc_free(dgram);
1241                         errno = saved_errno;
1242                         return ret;
1243                 }
1244         }
1245
1246         if (do_bind) {
1247                 ret = bind(fd, &lbsda->u.sa, sa_socklen);
1248                 if (ret == -1) {
1249                         int saved_errno = errno;
1250                         talloc_free(dgram);
1251                         errno = saved_errno;
1252                         return ret;
1253                 }
1254         }
1255
1256         if (rbsda) {
1257                 ret = connect(fd, &rbsda->u.sa, sa_socklen);
1258                 if (ret == -1) {
1259                         int saved_errno = errno;
1260                         talloc_free(dgram);
1261                         errno = saved_errno;
1262                         return ret;
1263                 }
1264         }
1265
1266         *_dgram = dgram;
1267         return 0;
1268 }
1269
1270 int _tdgram_inet_udp_socket(const struct tsocket_address *local,
1271                             const struct tsocket_address *remote,
1272                             TALLOC_CTX *mem_ctx,
1273                             struct tdgram_context **dgram,
1274                             const char *location)
1275 {
1276         struct tsocket_address_bsd *lbsda =
1277                 talloc_get_type_abort(local->private_data,
1278                 struct tsocket_address_bsd);
1279         int ret;
1280
1281         switch (lbsda->u.sa.sa_family) {
1282         case AF_INET:
1283                 break;
1284 #ifdef HAVE_IPV6
1285         case AF_INET6:
1286                 break;
1287 #endif
1288         default:
1289                 errno = EINVAL;
1290                 return -1;
1291         }
1292
1293         ret = tdgram_bsd_dgram_socket(local, remote, false,
1294                                       mem_ctx, dgram, location);
1295
1296         return ret;
1297 }
1298
1299 int _tdgram_unix_socket(const struct tsocket_address *local,
1300                         const struct tsocket_address *remote,
1301                         TALLOC_CTX *mem_ctx,
1302                         struct tdgram_context **dgram,
1303                         const char *location)
1304 {
1305         struct tsocket_address_bsd *lbsda =
1306                 talloc_get_type_abort(local->private_data,
1307                 struct tsocket_address_bsd);
1308         int ret;
1309
1310         switch (lbsda->u.sa.sa_family) {
1311         case AF_UNIX:
1312                 break;
1313         default:
1314                 errno = EINVAL;
1315                 return -1;
1316         }
1317
1318         ret = tdgram_bsd_dgram_socket(local, remote, false,
1319                                       mem_ctx, dgram, location);
1320
1321         return ret;
1322 }
1323
1324 struct tstream_bsd {
1325         int fd;
1326
1327         void *event_ptr;
1328         struct tevent_fd *fde;
1329
1330         void *readable_private;
1331         void (*readable_handler)(void *private_data);
1332         void *writeable_private;
1333         void (*writeable_handler)(void *private_data);
1334 };
1335
1336 static void tstream_bsd_fde_handler(struct tevent_context *ev,
1337                                     struct tevent_fd *fde,
1338                                     uint16_t flags,
1339                                     void *private_data)
1340 {
1341         struct tstream_bsd *bsds = talloc_get_type_abort(private_data,
1342                                    struct tstream_bsd);
1343
1344         if (flags & TEVENT_FD_WRITE) {
1345                 bsds->writeable_handler(bsds->writeable_private);
1346                 return;
1347         }
1348         if (flags & TEVENT_FD_READ) {
1349                 if (!bsds->readable_handler) {
1350                         if (bsds->writeable_handler) {
1351                                 bsds->writeable_handler(bsds->writeable_private);
1352                                 return;
1353                         }
1354                         TEVENT_FD_NOT_READABLE(bsds->fde);
1355                         return;
1356                 }
1357                 bsds->readable_handler(bsds->readable_private);
1358                 return;
1359         }
1360 }
1361
1362 static int tstream_bsd_set_readable_handler(struct tstream_bsd *bsds,
1363                                             struct tevent_context *ev,
1364                                             void (*handler)(void *private_data),
1365                                             void *private_data)
1366 {
1367         if (ev == NULL) {
1368                 if (handler) {
1369                         errno = EINVAL;
1370                         return -1;
1371                 }
1372                 if (!bsds->readable_handler) {
1373                         return 0;
1374                 }
1375                 bsds->readable_handler = NULL;
1376                 bsds->readable_private = NULL;
1377
1378                 return 0;
1379         }
1380
1381         /* read and write must use the same tevent_context */
1382         if (bsds->event_ptr != ev) {
1383                 if (bsds->readable_handler || bsds->writeable_handler) {
1384                         errno = EINVAL;
1385                         return -1;
1386                 }
1387                 bsds->event_ptr = NULL;
1388                 TALLOC_FREE(bsds->fde);
1389         }
1390
1391         if (tevent_fd_get_flags(bsds->fde) == 0) {
1392                 TALLOC_FREE(bsds->fde);
1393
1394                 bsds->fde = tevent_add_fd(ev, bsds,
1395                                           bsds->fd, TEVENT_FD_READ,
1396                                           tstream_bsd_fde_handler,
1397                                           bsds);
1398                 if (!bsds->fde) {
1399                         errno = ENOMEM;
1400                         return -1;
1401                 }
1402
1403                 /* cache the event context we're running on */
1404                 bsds->event_ptr = ev;
1405         } else if (!bsds->readable_handler) {
1406                 TEVENT_FD_READABLE(bsds->fde);
1407         }
1408
1409         bsds->readable_handler = handler;
1410         bsds->readable_private = private_data;
1411
1412         return 0;
1413 }
1414
1415 static int tstream_bsd_set_writeable_handler(struct tstream_bsd *bsds,
1416                                              struct tevent_context *ev,
1417                                              void (*handler)(void *private_data),
1418                                              void *private_data)
1419 {
1420         if (ev == NULL) {
1421                 if (handler) {
1422                         errno = EINVAL;
1423                         return -1;
1424                 }
1425                 if (!bsds->writeable_handler) {
1426                         return 0;
1427                 }
1428                 bsds->writeable_handler = NULL;
1429                 bsds->writeable_private = NULL;
1430                 TEVENT_FD_NOT_WRITEABLE(bsds->fde);
1431
1432                 return 0;
1433         }
1434
1435         /* read and write must use the same tevent_context */
1436         if (bsds->event_ptr != ev) {
1437                 if (bsds->readable_handler || bsds->writeable_handler) {
1438                         errno = EINVAL;
1439                         return -1;
1440                 }
1441                 bsds->event_ptr = NULL;
1442                 TALLOC_FREE(bsds->fde);
1443         }
1444
1445         if (tevent_fd_get_flags(bsds->fde) == 0) {
1446                 TALLOC_FREE(bsds->fde);
1447
1448                 bsds->fde = tevent_add_fd(ev, bsds,
1449                                           bsds->fd,
1450                                           TEVENT_FD_READ | TEVENT_FD_WRITE,
1451                                           tstream_bsd_fde_handler,
1452                                           bsds);
1453                 if (!bsds->fde) {
1454                         errno = ENOMEM;
1455                         return -1;
1456                 }
1457
1458                 /* cache the event context we're running on */
1459                 bsds->event_ptr = ev;
1460         } else if (!bsds->writeable_handler) {
1461                 uint16_t flags = tevent_fd_get_flags(bsds->fde);
1462                 flags |= TEVENT_FD_READ | TEVENT_FD_WRITE;
1463                 tevent_fd_set_flags(bsds->fde, flags);
1464         }
1465
1466         bsds->writeable_handler = handler;
1467         bsds->writeable_private = private_data;
1468
1469         return 0;
1470 }
1471
1472 static ssize_t tstream_bsd_pending_bytes(struct tstream_context *stream)
1473 {
1474         struct tstream_bsd *bsds = tstream_context_data(stream,
1475                                    struct tstream_bsd);
1476         ssize_t ret;
1477
1478         if (bsds->fd == -1) {
1479                 errno = ENOTCONN;
1480                 return -1;
1481         }
1482
1483         ret = tsocket_bsd_pending(bsds->fd);
1484
1485         return ret;
1486 }
1487
1488 struct tstream_bsd_readv_state {
1489         struct tstream_context *stream;
1490
1491         struct iovec *vector;
1492         size_t count;
1493
1494         int ret;
1495 };
1496
1497 static int tstream_bsd_readv_destructor(struct tstream_bsd_readv_state *state)
1498 {
1499         struct tstream_bsd *bsds = tstream_context_data(state->stream,
1500                                    struct tstream_bsd);
1501
1502         tstream_bsd_set_readable_handler(bsds, NULL, NULL, NULL);
1503
1504         return 0;
1505 }
1506
1507 static void tstream_bsd_readv_handler(void *private_data);
1508
1509 static struct tevent_req *tstream_bsd_readv_send(TALLOC_CTX *mem_ctx,
1510                                         struct tevent_context *ev,
1511                                         struct tstream_context *stream,
1512                                         struct iovec *vector,
1513                                         size_t count)
1514 {
1515         struct tevent_req *req;
1516         struct tstream_bsd_readv_state *state;
1517         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1518         int ret;
1519
1520         req = tevent_req_create(mem_ctx, &state,
1521                                 struct tstream_bsd_readv_state);
1522         if (!req) {
1523                 return NULL;
1524         }
1525
1526         state->stream   = stream;
1527         /* we make a copy of the vector so that we can modify it */
1528         state->vector   = talloc_array(state, struct iovec, count);
1529         if (tevent_req_nomem(state->vector, req)) {
1530                 goto post;
1531         }
1532         memcpy(state->vector, vector, sizeof(struct iovec)*count);
1533         state->count    = count;
1534         state->ret      = 0;
1535
1536         talloc_set_destructor(state, tstream_bsd_readv_destructor);
1537
1538         if (bsds->fd == -1) {
1539                 tevent_req_error(req, ENOTCONN);
1540                 goto post;
1541         }
1542
1543         /*
1544          * this is a fast path, not waiting for the
1545          * socket to become explicit readable gains
1546          * about 10%-20% performance in benchmark tests.
1547          */
1548         tstream_bsd_readv_handler(req);
1549         if (!tevent_req_is_in_progress(req)) {
1550                 goto post;
1551         }
1552
1553         ret = tstream_bsd_set_readable_handler(bsds, ev,
1554                                               tstream_bsd_readv_handler,
1555                                               req);
1556         if (ret == -1) {
1557                 tevent_req_error(req, errno);
1558                 goto post;
1559         }
1560
1561         return req;
1562
1563  post:
1564         tevent_req_post(req, ev);
1565         return req;
1566 }
1567
1568 static void tstream_bsd_readv_handler(void *private_data)
1569 {
1570         struct tevent_req *req = talloc_get_type_abort(private_data,
1571                                  struct tevent_req);
1572         struct tstream_bsd_readv_state *state = tevent_req_data(req,
1573                                         struct tstream_bsd_readv_state);
1574         struct tstream_context *stream = state->stream;
1575         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1576         int ret;
1577         int err;
1578         bool retry;
1579
1580         ret = readv(bsds->fd, state->vector, state->count);
1581         if (ret == 0) {
1582                 /* propagate end of file */
1583                 tevent_req_error(req, EPIPE);
1584                 return;
1585         }
1586         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
1587         if (retry) {
1588                 /* retry later */
1589                 return;
1590         }
1591         if (tevent_req_error(req, err)) {
1592                 return;
1593         }
1594
1595         state->ret += ret;
1596
1597         while (ret > 0) {
1598                 if (ret < state->vector[0].iov_len) {
1599                         uint8_t *base;
1600                         base = (uint8_t *)state->vector[0].iov_base;
1601                         base += ret;
1602                         state->vector[0].iov_base = base;
1603                         state->vector[0].iov_len -= ret;
1604                         break;
1605                 }
1606                 ret -= state->vector[0].iov_len;
1607                 state->vector += 1;
1608                 state->count -= 1;
1609         }
1610
1611         /*
1612          * there're maybe some empty vectors at the end
1613          * which we need to skip, otherwise we would get
1614          * ret == 0 from the readv() call and return EPIPE
1615          */
1616         while (state->count > 0) {
1617                 if (state->vector[0].iov_len > 0) {
1618                         break;
1619                 }
1620                 state->vector += 1;
1621                 state->count -= 1;
1622         }
1623
1624         if (state->count > 0) {
1625                 /* we have more to read */
1626                 return;
1627         }
1628
1629         tevent_req_done(req);
1630 }
1631
1632 static int tstream_bsd_readv_recv(struct tevent_req *req,
1633                                   int *perrno)
1634 {
1635         struct tstream_bsd_readv_state *state = tevent_req_data(req,
1636                                         struct tstream_bsd_readv_state);
1637         int ret;
1638
1639         ret = tsocket_simple_int_recv(req, perrno);
1640         if (ret == 0) {
1641                 ret = state->ret;
1642         }
1643
1644         tevent_req_received(req);
1645         return ret;
1646 }
1647
1648 struct tstream_bsd_writev_state {
1649         struct tstream_context *stream;
1650
1651         struct iovec *vector;
1652         size_t count;
1653
1654         int ret;
1655 };
1656
1657 static int tstream_bsd_writev_destructor(struct tstream_bsd_writev_state *state)
1658 {
1659         struct tstream_bsd *bsds = tstream_context_data(state->stream,
1660                                   struct tstream_bsd);
1661
1662         tstream_bsd_set_writeable_handler(bsds, NULL, NULL, NULL);
1663
1664         return 0;
1665 }
1666
1667 static void tstream_bsd_writev_handler(void *private_data);
1668
1669 static struct tevent_req *tstream_bsd_writev_send(TALLOC_CTX *mem_ctx,
1670                                                  struct tevent_context *ev,
1671                                                  struct tstream_context *stream,
1672                                                  const struct iovec *vector,
1673                                                  size_t count)
1674 {
1675         struct tevent_req *req;
1676         struct tstream_bsd_writev_state *state;
1677         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1678         int ret;
1679
1680         req = tevent_req_create(mem_ctx, &state,
1681                                 struct tstream_bsd_writev_state);
1682         if (!req) {
1683                 return NULL;
1684         }
1685
1686         state->stream   = stream;
1687         /* we make a copy of the vector so that we can modify it */
1688         state->vector   = talloc_array(state, struct iovec, count);
1689         if (tevent_req_nomem(state->vector, req)) {
1690                 goto post;
1691         }
1692         memcpy(state->vector, vector, sizeof(struct iovec)*count);
1693         state->count    = count;
1694         state->ret      = 0;
1695
1696         talloc_set_destructor(state, tstream_bsd_writev_destructor);
1697
1698         if (bsds->fd == -1) {
1699                 tevent_req_error(req, ENOTCONN);
1700                 goto post;
1701         }
1702
1703         /*
1704          * this is a fast path, not waiting for the
1705          * socket to become explicit writeable gains
1706          * about 10%-20% performance in benchmark tests.
1707          */
1708         tstream_bsd_writev_handler(req);
1709         if (!tevent_req_is_in_progress(req)) {
1710                 goto post;
1711         }
1712
1713         ret = tstream_bsd_set_writeable_handler(bsds, ev,
1714                                                tstream_bsd_writev_handler,
1715                                                req);
1716         if (ret == -1) {
1717                 tevent_req_error(req, errno);
1718                 goto post;
1719         }
1720
1721         return req;
1722
1723  post:
1724         tevent_req_post(req, ev);
1725         return req;
1726 }
1727
1728 static void tstream_bsd_writev_handler(void *private_data)
1729 {
1730         struct tevent_req *req = talloc_get_type_abort(private_data,
1731                                  struct tevent_req);
1732         struct tstream_bsd_writev_state *state = tevent_req_data(req,
1733                                         struct tstream_bsd_writev_state);
1734         struct tstream_context *stream = state->stream;
1735         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1736         ssize_t ret;
1737         int err;
1738         bool retry;
1739
1740         ret = writev(bsds->fd, state->vector, state->count);
1741         if (ret == 0) {
1742                 /* propagate end of file */
1743                 tevent_req_error(req, EPIPE);
1744                 return;
1745         }
1746         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
1747         if (retry) {
1748                 /* retry later */
1749                 return;
1750         }
1751         if (tevent_req_error(req, err)) {
1752                 return;
1753         }
1754
1755         state->ret += ret;
1756
1757         while (ret > 0) {
1758                 if (ret < state->vector[0].iov_len) {
1759                         uint8_t *base;
1760                         base = (uint8_t *)state->vector[0].iov_base;
1761                         base += ret;
1762                         state->vector[0].iov_base = base;
1763                         state->vector[0].iov_len -= ret;
1764                         break;
1765                 }
1766                 ret -= state->vector[0].iov_len;
1767                 state->vector += 1;
1768                 state->count -= 1;
1769         }
1770
1771         /*
1772          * there're maybe some empty vectors at the end
1773          * which we need to skip, otherwise we would get
1774          * ret == 0 from the writev() call and return EPIPE
1775          */
1776         while (state->count > 0) {
1777                 if (state->vector[0].iov_len > 0) {
1778                         break;
1779                 }
1780                 state->vector += 1;
1781                 state->count -= 1;
1782         }
1783
1784         if (state->count > 0) {
1785                 /* we have more to read */
1786                 return;
1787         }
1788
1789         tevent_req_done(req);
1790 }
1791
1792 static int tstream_bsd_writev_recv(struct tevent_req *req, int *perrno)
1793 {
1794         struct tstream_bsd_writev_state *state = tevent_req_data(req,
1795                                         struct tstream_bsd_writev_state);
1796         int ret;
1797
1798         ret = tsocket_simple_int_recv(req, perrno);
1799         if (ret == 0) {
1800                 ret = state->ret;
1801         }
1802
1803         tevent_req_received(req);
1804         return ret;
1805 }
1806
1807 struct tstream_bsd_disconnect_state {
1808         void *__dummy;
1809 };
1810
1811 static struct tevent_req *tstream_bsd_disconnect_send(TALLOC_CTX *mem_ctx,
1812                                                      struct tevent_context *ev,
1813                                                      struct tstream_context *stream)
1814 {
1815         struct tstream_bsd *bsds = tstream_context_data(stream, struct tstream_bsd);
1816         struct tevent_req *req;
1817         struct tstream_bsd_disconnect_state *state;
1818         int ret;
1819         int err;
1820         bool dummy;
1821
1822         req = tevent_req_create(mem_ctx, &state,
1823                                 struct tstream_bsd_disconnect_state);
1824         if (req == NULL) {
1825                 return NULL;
1826         }
1827
1828         if (bsds->fd == -1) {
1829                 tevent_req_error(req, ENOTCONN);
1830                 goto post;
1831         }
1832
1833         ret = close(bsds->fd);
1834         bsds->fd = -1;
1835         err = tsocket_bsd_error_from_errno(ret, errno, &dummy);
1836         if (tevent_req_error(req, err)) {
1837                 goto post;
1838         }
1839
1840         tevent_req_done(req);
1841 post:
1842         tevent_req_post(req, ev);
1843         return req;
1844 }
1845
1846 static int tstream_bsd_disconnect_recv(struct tevent_req *req,
1847                                       int *perrno)
1848 {
1849         int ret;
1850
1851         ret = tsocket_simple_int_recv(req, perrno);
1852
1853         tevent_req_received(req);
1854         return ret;
1855 }
1856
1857 static const struct tstream_context_ops tstream_bsd_ops = {
1858         .name                   = "bsd",
1859
1860         .pending_bytes          = tstream_bsd_pending_bytes,
1861
1862         .readv_send             = tstream_bsd_readv_send,
1863         .readv_recv             = tstream_bsd_readv_recv,
1864
1865         .writev_send            = tstream_bsd_writev_send,
1866         .writev_recv            = tstream_bsd_writev_recv,
1867
1868         .disconnect_send        = tstream_bsd_disconnect_send,
1869         .disconnect_recv        = tstream_bsd_disconnect_recv,
1870 };
1871
1872 static int tstream_bsd_destructor(struct tstream_bsd *bsds)
1873 {
1874         TALLOC_FREE(bsds->fde);
1875         if (bsds->fd != -1) {
1876                 close(bsds->fd);
1877                 bsds->fd = -1;
1878         }
1879         return 0;
1880 }
1881
1882 int _tstream_bsd_existing_socket(TALLOC_CTX *mem_ctx,
1883                                  int fd,
1884                                  struct tstream_context **_stream,
1885                                  const char *location)
1886 {
1887         struct tstream_context *stream;
1888         struct tstream_bsd *bsds;
1889
1890         stream = tstream_context_create(mem_ctx,
1891                                         &tstream_bsd_ops,
1892                                         &bsds,
1893                                         struct tstream_bsd,
1894                                         location);
1895         if (!stream) {
1896                 return -1;
1897         }
1898         ZERO_STRUCTP(bsds);
1899         bsds->fd = fd;
1900         talloc_set_destructor(bsds, tstream_bsd_destructor);
1901
1902         *_stream = stream;
1903         return 0;
1904 }
1905
1906 struct tstream_bsd_connect_state {
1907         int fd;
1908         struct tevent_fd *fde;
1909         struct tstream_conext *stream;
1910 };
1911
1912 static int tstream_bsd_connect_destructor(struct tstream_bsd_connect_state *state)
1913 {
1914         TALLOC_FREE(state->fde);
1915         if (state->fd != -1) {
1916                 close(state->fd);
1917                 state->fd = -1;
1918         }
1919
1920         return 0;
1921 }
1922
1923 static void tstream_bsd_connect_fde_handler(struct tevent_context *ev,
1924                                             struct tevent_fd *fde,
1925                                             uint16_t flags,
1926                                             void *private_data);
1927
1928 static struct tevent_req * tstream_bsd_connect_send(TALLOC_CTX *mem_ctx,
1929                                         struct tevent_context *ev,
1930                                         int sys_errno,
1931                                         const struct tsocket_address *local,
1932                                         const struct tsocket_address *remote)
1933 {
1934         struct tevent_req *req;
1935         struct tstream_bsd_connect_state *state;
1936         struct tsocket_address_bsd *lbsda =
1937                 talloc_get_type_abort(local->private_data,
1938                 struct tsocket_address_bsd);
1939         struct tsocket_address_bsd *rbsda =
1940                 talloc_get_type_abort(remote->private_data,
1941                 struct tsocket_address_bsd);
1942         int ret;
1943         int err;
1944         bool retry;
1945         bool do_bind = false;
1946         bool do_reuseaddr = false;
1947         socklen_t sa_socklen = sizeof(rbsda->u.ss);
1948
1949         req = tevent_req_create(mem_ctx, &state,
1950                                 struct tstream_bsd_connect_state);
1951         if (!req) {
1952                 return NULL;
1953         }
1954         state->fd = -1;
1955         state->fde = NULL;
1956
1957         talloc_set_destructor(state, tstream_bsd_connect_destructor);
1958
1959         /* give the wrappers a chance to report an error */
1960         if (sys_errno != 0) {
1961                 tevent_req_error(req, sys_errno);
1962                 goto post;
1963         }
1964
1965         switch (lbsda->u.sa.sa_family) {
1966         case AF_UNIX:
1967                 if (lbsda->u.un.sun_path[0] != 0) {
1968                         do_reuseaddr = true;
1969                         do_bind = true;
1970                 }
1971                 /*
1972                  * for unix sockets we can't use the size of sockaddr_storage
1973                  * we would get EINVAL
1974                  */
1975                 sa_socklen = sizeof(rbsda->u.un);
1976                 break;
1977         case AF_INET:
1978                 if (lbsda->u.in.sin_port != 0) {
1979                         do_reuseaddr = true;
1980                         do_bind = true;
1981                 }
1982                 if (lbsda->u.in.sin_addr.s_addr != INADDR_ANY) {
1983                         do_bind = true;
1984                 }
1985                 break;
1986 #ifdef HAVE_IPV6
1987         case AF_INET6:
1988                 if (lbsda->u.in6.sin6_port != 0) {
1989                         do_reuseaddr = true;
1990                         do_bind = true;
1991                 }
1992                 if (memcmp(&in6addr_any,
1993                            &lbsda->u.in6.sin6_addr,
1994                            sizeof(in6addr_any)) != 0) {
1995                         do_bind = true;
1996                 }
1997                 break;
1998 #endif
1999         default:
2000                 tevent_req_error(req, EINVAL);
2001                 goto post;
2002         }
2003
2004         state->fd = socket(lbsda->u.sa.sa_family, SOCK_STREAM, 0);
2005         if (state->fd == -1) {
2006                 tevent_req_error(req, errno);
2007                 goto post;
2008         }
2009
2010         state->fd = tsocket_bsd_common_prepare_fd(state->fd, true);
2011         if (state->fd == -1) {
2012                 tevent_req_error(req, errno);
2013                 goto post;
2014         }
2015
2016         if (do_reuseaddr) {
2017                 int val = 1;
2018
2019                 ret = setsockopt(state->fd, SOL_SOCKET, SO_REUSEADDR,
2020                                  (const void *)&val, sizeof(val));
2021                 if (ret == -1) {
2022                         tevent_req_error(req, errno);
2023                         goto post;
2024                 }
2025         }
2026
2027         if (do_bind) {
2028                 ret = bind(state->fd, &lbsda->u.sa, sizeof(lbsda->u.ss));
2029                 if (ret == -1) {
2030                         tevent_req_error(req, errno);
2031                         goto post;
2032                 }
2033         }
2034
2035         ret = connect(state->fd, &rbsda->u.sa, sa_socklen);
2036         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
2037         if (retry) {
2038                 /* retry later */
2039                 goto async;
2040         }
2041         if (tevent_req_error(req, err)) {
2042                 goto post;
2043         }
2044
2045         tevent_req_done(req);
2046         goto post;
2047
2048  async:
2049         state->fde = tevent_add_fd(ev, state,
2050                                    state->fd,
2051                                    TEVENT_FD_READ | TEVENT_FD_WRITE,
2052                                    tstream_bsd_connect_fde_handler,
2053                                    req);
2054         if (tevent_req_nomem(state->fde, req)) {
2055                 goto post;
2056         }
2057
2058         return req;
2059
2060  post:
2061         tevent_req_post(req, ev);
2062         return req;
2063 }
2064
2065 static void tstream_bsd_connect_fde_handler(struct tevent_context *ev,
2066                                             struct tevent_fd *fde,
2067                                             uint16_t flags,
2068                                             void *private_data)
2069 {
2070         struct tevent_req *req = talloc_get_type_abort(private_data,
2071                                  struct tevent_req);
2072         struct tstream_bsd_connect_state *state = tevent_req_data(req,
2073                                         struct tstream_bsd_connect_state);
2074         int ret;
2075         int error=0;
2076         socklen_t len = sizeof(error);
2077         int err;
2078         bool retry;
2079
2080         ret = getsockopt(state->fd, SOL_SOCKET, SO_ERROR, &error, &len);
2081         if (ret == 0) {
2082                 if (error != 0) {
2083                         errno = error;
2084                         ret = -1;
2085                 }
2086         }
2087         err = tsocket_bsd_error_from_errno(ret, errno, &retry);
2088         if (retry) {
2089                 /* retry later */
2090                 return;
2091         }
2092         if (tevent_req_error(req, err)) {
2093                 return;
2094         }
2095
2096         tevent_req_done(req);
2097 }
2098
2099 static int tstream_bsd_connect_recv(struct tevent_req *req,
2100                                     int *perrno,
2101                                     TALLOC_CTX *mem_ctx,
2102                                     struct tstream_context **stream,
2103                                     const char *location)
2104 {
2105         struct tstream_bsd_connect_state *state = tevent_req_data(req,
2106                                         struct tstream_bsd_connect_state);
2107         int ret;
2108
2109         ret = tsocket_simple_int_recv(req, perrno);
2110         if (ret == 0) {
2111                 ret = _tstream_bsd_existing_socket(mem_ctx,
2112                                                    state->fd,
2113                                                    stream,
2114                                                    location);
2115                 if (ret == -1) {
2116                         *perrno = errno;
2117                         goto done;
2118                 }
2119                 TALLOC_FREE(state->fde);
2120                 state->fd = -1;
2121         }
2122
2123 done:
2124         tevent_req_received(req);
2125         return ret;
2126 }
2127
2128 struct tevent_req * tstream_inet_tcp_connect_send(TALLOC_CTX *mem_ctx,
2129                                         struct tevent_context *ev,
2130                                         const struct tsocket_address *local,
2131                                         const struct tsocket_address *remote)
2132 {
2133         struct tsocket_address_bsd *lbsda =
2134                 talloc_get_type_abort(local->private_data,
2135                 struct tsocket_address_bsd);
2136         struct tevent_req *req;
2137         int sys_errno = 0;
2138
2139         switch (lbsda->u.sa.sa_family) {
2140         case AF_INET:
2141                 break;
2142 #ifdef HAVE_IPV6
2143         case AF_INET6:
2144                 break;
2145 #endif
2146         default:
2147                 sys_errno = EINVAL;
2148                 break;
2149         }
2150
2151         req = tstream_bsd_connect_send(mem_ctx, ev, sys_errno, local, remote);
2152
2153         return req;
2154 }
2155
2156 int _tstream_inet_tcp_connect_recv(struct tevent_req *req,
2157                                    int *perrno,
2158                                    TALLOC_CTX *mem_ctx,
2159                                    struct tstream_context **stream,
2160                                    const char *location)
2161 {
2162         return tstream_bsd_connect_recv(req, perrno, mem_ctx, stream, location);
2163 }
2164
2165 struct tevent_req * tstream_unix_connect_send(TALLOC_CTX *mem_ctx,
2166                                         struct tevent_context *ev,
2167                                         const struct tsocket_address *local,
2168                                         const struct tsocket_address *remote)
2169 {
2170         struct tsocket_address_bsd *lbsda =
2171                 talloc_get_type_abort(local->private_data,
2172                 struct tsocket_address_bsd);
2173         struct tevent_req *req;
2174         int sys_errno = 0;
2175
2176         switch (lbsda->u.sa.sa_family) {
2177         case AF_UNIX:
2178                 break;
2179         default:
2180                 sys_errno = EINVAL;
2181                 break;
2182         }
2183
2184         req = tstream_bsd_connect_send(mem_ctx, ev, sys_errno, local, remote);
2185
2186         return req;
2187 }
2188
2189 int _tstream_unix_connect_recv(struct tevent_req *req,
2190                                       int *perrno,
2191                                       TALLOC_CTX *mem_ctx,
2192                                       struct tstream_context **stream,
2193                                       const char *location)
2194 {
2195         return tstream_bsd_connect_recv(req, perrno, mem_ctx, stream, location);
2196 }
2197
2198 int _tstream_unix_socketpair(TALLOC_CTX *mem_ctx1,
2199                              struct tstream_context **_stream1,
2200                              TALLOC_CTX *mem_ctx2,
2201                              struct tstream_context **_stream2,
2202                              const char *location)
2203 {
2204         int ret;
2205         int fds[2];
2206         int fd1;
2207         int fd2;
2208         struct tstream_context *stream1 = NULL;
2209         struct tstream_context *stream2 = NULL;
2210
2211         ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
2212         if (ret == -1) {
2213                 return -1;
2214         }
2215         fd1 = fds[0];
2216         fd2 = fds[1];
2217
2218         fd1 = tsocket_bsd_common_prepare_fd(fd1, true);
2219         if (fd1 == -1) {
2220                 int sys_errno = errno;
2221                 close(fd2);
2222                 errno = sys_errno;
2223                 return -1;
2224         }
2225
2226         fd2 = tsocket_bsd_common_prepare_fd(fd2, true);
2227         if (fd2 == -1) {
2228                 int sys_errno = errno;
2229                 close(fd1);
2230                 errno = sys_errno;
2231                 return -1;
2232         }
2233
2234         ret = _tstream_bsd_existing_socket(mem_ctx1,
2235                                            fd1,
2236                                            &stream1,
2237                                            location);
2238         if (ret == -1) {
2239                 int sys_errno = errno;
2240                 close(fd1);
2241                 close(fd2);
2242                 errno = sys_errno;
2243                 return -1;
2244         }
2245
2246         ret = _tstream_bsd_existing_socket(mem_ctx2,
2247                                            fd2,
2248                                            &stream2,
2249                                            location);
2250         if (ret == -1) {
2251                 int sys_errno = errno;
2252                 talloc_free(stream1);
2253                 close(fd2);
2254                 errno = sys_errno;
2255                 return -1;
2256         }
2257
2258         *_stream1 = stream1;
2259         *_stream2 = stream2;
2260         return 0;
2261 }
2262