util/qemu-sockets.c

   1 /*
   2  *  inet and unix socket functions for qemu
   3  *
   4  *  (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; under version 2 of the License.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  * Contributions after 2012-01-13 are licensed under the terms of the
  16  * GNU GPL, version 2 or (at your option) any later version.
  17  */
  18 #include "qemu/osdep.h"
  19
  20 #ifdef CONFIG_AF_VSOCK
  21 #include <linux/vm_sockets.h>
  22 #endif /* CONFIG_AF_VSOCK */
  23
  24 #include "qemu-common.h"
  25 #include "monitor/monitor.h"
  26 #include "qapi/clone-visitor.h"
  27 #include "qapi/error.h"
  28 #include "qapi/qapi-visit-sockets.h"
  29 #include "qemu/sockets.h"
  30 #include "qemu/main-loop.h"
  31 #include "qapi/qobject-input-visitor.h"
  32 #include "qapi/qobject-output-visitor.h"
  33 #include "qemu/cutils.h"
  34
  35 #ifndef AI_ADDRCONFIG
  36 # define AI_ADDRCONFIG 0
  37 #endif
  38
  39 #ifndef AI_V4MAPPED
  40 # define AI_V4MAPPED 0
  41 #endif
  42
  43 #ifndef AI_NUMERICSERV
  44 # define AI_NUMERICSERV 0
  45 #endif
  46
  47
  48 static int inet_getport(struct addrinfo *e)
  49 {
  50     struct sockaddr_in *i4;
  51     struct sockaddr_in6 *i6;
  52
  53     switch (e->ai_family) {
  54     case PF_INET6:
  55         i6 = (void*)e->ai_addr;
  56         return ntohs(i6->sin6_port);
  57     case PF_INET:
  58         i4 = (void*)e->ai_addr;
  59         return ntohs(i4->sin_port);
  60     default:
  61         return 0;
  62     }
  63 }
  64
  65 static void inet_setport(struct addrinfo *e, int port)
  66 {
  67     struct sockaddr_in *i4;
  68     struct sockaddr_in6 *i6;
  69
  70     switch (e->ai_family) {
  71     case PF_INET6:
  72         i6 = (void*)e->ai_addr;
  73         i6->sin6_port = htons(port);
  74         break;
  75     case PF_INET:
  76         i4 = (void*)e->ai_addr;
  77         i4->sin_port = htons(port);
  78         break;
  79     }
  80 }
  81
  82 NetworkAddressFamily inet_netfamily(int family)
  83 {
  84     switch (family) {
  85     case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
  86     case PF_INET:  return NETWORK_ADDRESS_FAMILY_IPV4;
  87     case PF_UNIX:  return NETWORK_ADDRESS_FAMILY_UNIX;
  88 #ifdef CONFIG_AF_VSOCK
  89     case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK;
  90 #endif /* CONFIG_AF_VSOCK */
  91     }
  92     return NETWORK_ADDRESS_FAMILY_UNKNOWN;
  93 }
  94
  95 bool fd_is_socket(int fd)
  96 {
  97     int optval;
  98     socklen_t optlen = sizeof(optval);
  99     return !qemu_getsockopt(fd, SOL_SOCKET, SO_TYPE, &optval, &optlen);
 100 }
 101
 102
 103 /*
 104  * Matrix we're trying to apply
 105  *
 106  *  ipv4  ipv6   family
 107  *   -     -       PF_UNSPEC
 108  *   -     f       PF_INET
 109  *   -     t       PF_INET6
 110  *   f     -       PF_INET6
 111  *   f     f       <error>
 112  *   f     t       PF_INET6
 113  *   t     -       PF_INET
 114  *   t     f       PF_INET
 115  *   t     t       PF_INET6/PF_UNSPEC
 116  *
 117  * NB, this matrix is only about getting the necessary results
 118  * from getaddrinfo(). Some of the cases require further work
 119  * after reading results from getaddrinfo in order to fully
 120  * apply the logic the end user wants.
 121  *
 122  * In the first and last cases, we must set IPV6_V6ONLY=0
 123  * when binding, to allow a single listener to potentially
 124  * accept both IPv4+6 addresses.
 125  */
 126 int inet_ai_family_from_address(InetSocketAddress *addr,
 127                                 Error **errp)
 128 {
 129     if (addr->has_ipv6 && addr->has_ipv4 &&
 130         !addr->ipv6 && !addr->ipv4) {
 131         error_setg(errp, "Cannot disable IPv4 and IPv6 at same time");
 132         return PF_UNSPEC;
 133     }
 134     if ((addr->has_ipv6 && addr->ipv6) && (addr->has_ipv4 && addr->ipv4)) {
 135         /*
 136          * Some backends can only do a single listener. In that case
 137          * we want empty hostname to resolve to "::" and then use the
 138          * flag IPV6_V6ONLY==0 to get both protocols on 1 socket. This
 139          * doesn't work for addresses other than "", so they're just
 140          * inevitably broken until multiple listeners can be used,
 141          * and thus we honour getaddrinfo automatic protocol detection
 142          * Once all backends do multi-listener, remove the PF_INET6
 143          * branch entirely.
 144          */
 145         if (!addr->host || g_str_equal(addr->host, "")) {
 146             return PF_INET6;
 147         } else {
 148             return PF_UNSPEC;
 149         }
 150     }
 151     if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) {
 152         return PF_INET6;
 153     }
 154     if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) {
 155         return PF_INET;
 156     }
 157     return PF_UNSPEC;
 158 }
 159
 160 static int create_fast_reuse_socket(struct addrinfo *e)
 161 {
 162     int slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 163     if (slisten < 0) {
 164         return -1;
 165     }
 166     socket_set_fast_reuse(slisten);
 167     return slisten;
 168 }
 169
 170 static int try_bind(int socket, InetSocketAddress *saddr, struct addrinfo *e)
 171 {
 172 #ifndef IPV6_V6ONLY
 173     return bind(socket, e->ai_addr, e->ai_addrlen);
 174 #else
 175     /*
 176      * Deals with first & last cases in matrix in comment
 177      * for inet_ai_family_from_address().
 178      */
 179     int v6only =
 180         ((!saddr->has_ipv4 && !saddr->has_ipv6) ||
 181          (saddr->has_ipv4 && saddr->ipv4 &&
 182           saddr->has_ipv6 && saddr->ipv6)) ? 0 : 1;
 183     int stat;
 184
 185  rebind:
 186     if (e->ai_family == PF_INET6) {
 187         qemu_setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, &v6only,
 188                         sizeof(v6only));
 189     }
 190
 191     stat = bind(socket, e->ai_addr, e->ai_addrlen);
 192     if (!stat) {
 193         return 0;
 194     }
 195
 196     /* If we got EADDRINUSE from an IPv6 bind & v6only is unset,
 197      * it could be that the IPv4 port is already claimed, so retry
 198      * with v6only set
 199      */
 200     if (e->ai_family == PF_INET6 && errno == EADDRINUSE && !v6only) {
 201         v6only = 1;
 202         goto rebind;
 203     }
 204     return stat;
 205 #endif
 206 }
 207
 208 static int inet_listen_saddr(InetSocketAddress *saddr,
 209                              int port_offset,
 210                              Error **errp)
 211 {
 212     struct addrinfo ai,*res,*e;
 213     char port[33];
 214     char uaddr[INET6_ADDRSTRLEN+1];
 215     char uport[33];
 216     int rc, port_min, port_max, p;
 217     int slisten = -1;
 218     int saved_errno = 0;
 219     bool socket_created = false;
 220     Error *err = NULL;
 221
 222     memset(&ai,0, sizeof(ai));
 223     ai.ai_flags = AI_PASSIVE;
 224     if (saddr->has_numeric && saddr->numeric) {
 225         ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
 226     }
 227     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 228     ai.ai_socktype = SOCK_STREAM;
 229
 230     if (err) {
 231         error_propagate(errp, err);
 232         return -1;
 233     }
 234
 235     if (saddr->host == NULL) {
 236         error_setg(errp, "host not specified");
 237         return -1;
 238     }
 239     if (saddr->port != NULL) {
 240         pstrcpy(port, sizeof(port), saddr->port);
 241     } else {
 242         port[0] = '\0';
 243     }
 244
 245     /* lookup */
 246     if (port_offset) {
 247         unsigned long long baseport;
 248         if (strlen(port) == 0) {
 249             error_setg(errp, "port not specified");
 250             return -1;
 251         }
 252         if (parse_uint_full(port, &baseport, 10) < 0) {
 253             error_setg(errp, "can't convert to a number: %s", port);
 254             return -1;
 255         }
 256         if (baseport > 65535 ||
 257             baseport + port_offset > 65535) {
 258             error_setg(errp, "port %s out of range", port);
 259             return -1;
 260         }
 261         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 262     }
 263     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 264                      strlen(port) ? port : NULL, &ai, &res);
 265     if (rc != 0) {
 266         error_setg(errp, "address resolution failed for %s:%s: %s",
 267                    saddr->host, port, gai_strerror(rc));
 268         return -1;
 269     }
 270
 271     /* create socket + bind/listen */
 272     for (e = res; e != NULL; e = e->ai_next) {
 273         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 274                         uaddr,INET6_ADDRSTRLEN,uport,32,
 275                         NI_NUMERICHOST | NI_NUMERICSERV);
 276
 277         port_min = inet_getport(e);
 278         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 279         for (p = port_min; p <= port_max; p++) {
 280             inet_setport(e, p);
 281
 282             slisten = create_fast_reuse_socket(e);
 283             if (slisten < 0) {
 284                 /* First time we expect we might fail to create the socket
 285                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 286                  * Later iterations should always succeed if first iteration
 287                  * worked though, so treat that as fatal.
 288                  */
 289                 if (p == port_min) {
 290                     continue;
 291                 } else {
 292                     error_setg_errno(errp, errno,
 293                                      "Failed to recreate failed listening socket");
 294                     goto listen_failed;
 295                 }
 296             }
 297             socket_created = true;
 298
 299             rc = try_bind(slisten, saddr, e);
 300             if (rc < 0) {
 301                 if (errno != EADDRINUSE) {
 302                     error_setg_errno(errp, errno, "Failed to bind socket");
 303                     goto listen_failed;
 304                 }
 305             } else {
 306                 if (!listen(slisten, 1)) {
 307                     goto listen_ok;
 308                 }
 309                 if (errno != EADDRINUSE) {
 310                     error_setg_errno(errp, errno, "Failed to listen on socket");
 311                     goto listen_failed;
 312                 }
 313             }
 314             /* Someone else managed to bind to the same port and beat us
 315              * to listen on it! Socket semantics does not allow us to
 316              * recover from this situation, so we need to recreate the
 317              * socket to allow bind attempts for subsequent ports:
 318              */
 319             closesocket(slisten);
 320             slisten = -1;
 321         }
 322     }
 323     error_setg_errno(errp, errno,
 324                      socket_created ?
 325                      "Failed to find an available port" :
 326                      "Failed to create a socket");
 327 listen_failed:
 328     saved_errno = errno;
 329     if (slisten >= 0) {
 330         closesocket(slisten);
 331     }
 332     freeaddrinfo(res);
 333     errno = saved_errno;
 334     return -1;
 335
 336 listen_ok:
 337     freeaddrinfo(res);
 338     return slisten;
 339 }
 340
 341 #ifdef _WIN32
 342 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 343     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 344 #else
 345 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 346     ((rc) == -EINPROGRESS)
 347 #endif
 348
 349 static int inet_connect_addr(struct addrinfo *addr, Error **errp);
 350
 351 static int inet_connect_addr(struct addrinfo *addr, Error **errp)
 352 {
 353     int sock, rc;
 354
 355     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 356     if (sock < 0) {
 357         error_setg_errno(errp, errno, "Failed to create socket");
 358         return -1;
 359     }
 360     socket_set_fast_reuse(sock);
 361
 362     /* connect to peer */
 363     do {
 364         rc = 0;
 365         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 366             rc = -errno;
 367         }
 368     } while (rc == -EINTR);
 369
 370     if (rc < 0) {
 371         error_setg_errno(errp, errno, "Failed to connect socket");
 372         closesocket(sock);
 373         return -1;
 374     }
 375
 376     return sock;
 377 }
 378
 379 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 380                                                  Error **errp)
 381 {
 382     struct addrinfo ai, *res;
 383     int rc;
 384     Error *err = NULL;
 385     static int useV4Mapped = 1;
 386
 387     memset(&ai, 0, sizeof(ai));
 388
 389     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 390     if (atomic_read(&useV4Mapped)) {
 391         ai.ai_flags |= AI_V4MAPPED;
 392     }
 393     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 394     ai.ai_socktype = SOCK_STREAM;
 395
 396     if (err) {
 397         error_propagate(errp, err);
 398         return NULL;
 399     }
 400
 401     if (saddr->host == NULL || saddr->port == NULL) {
 402         error_setg(errp, "host and/or port not specified");
 403         return NULL;
 404     }
 405
 406     /* lookup */
 407     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 408
 409     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 410      * then don't implement it in their getaddrinfo(). Detect
 411      * this and retry without the flag since that's preferrable
 412      * to a fatal error
 413      */
 414     if (rc == EAI_BADFLAGS &&
 415         (ai.ai_flags & AI_V4MAPPED)) {
 416         atomic_set(&useV4Mapped, 0);
 417         ai.ai_flags &= ~AI_V4MAPPED;
 418         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 419     }
 420     if (rc != 0) {
 421         error_setg(errp, "address resolution failed for %s:%s: %s",
 422                    saddr->host, saddr->port, gai_strerror(rc));
 423         return NULL;
 424     }
 425     return res;
 426 }
 427
 428 /**
 429  * Create a socket and connect it to an address.
 430  *
 431  * @saddr: Inet socket address specification
 432  * @errp: set on error
 433  *
 434  * Returns: -1 on error, file descriptor on success.
 435  */
 436 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 437 {
 438     Error *local_err = NULL;
 439     struct addrinfo *res, *e;
 440     int sock = -1;
 441
 442     res = inet_parse_connect_saddr(saddr, errp);
 443     if (!res) {
 444         return -1;
 445     }
 446
 447     for (e = res; e != NULL; e = e->ai_next) {
 448         error_free(local_err);
 449         local_err = NULL;
 450         sock = inet_connect_addr(e, &local_err);
 451         if (sock >= 0) {
 452             break;
 453         }
 454     }
 455
 456     if (sock < 0) {
 457         error_propagate(errp, local_err);
 458     }
 459
 460     freeaddrinfo(res);
 461     return sock;
 462 }
 463
 464 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 465                             InetSocketAddress *sladdr,
 466                             Error **errp)
 467 {
 468     struct addrinfo ai, *peer = NULL, *local = NULL;
 469     const char *addr;
 470     const char *port;
 471     int sock = -1, rc;
 472     Error *err = NULL;
 473
 474     /* lookup peer addr */
 475     memset(&ai,0, sizeof(ai));
 476     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 477     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 478     ai.ai_socktype = SOCK_DGRAM;
 479
 480     if (err) {
 481         error_propagate(errp, err);
 482         goto err;
 483     }
 484
 485     addr = sraddr->host;
 486     port = sraddr->port;
 487     if (addr == NULL || strlen(addr) == 0) {
 488         addr = "localhost";
 489     }
 490     if (port == NULL || strlen(port) == 0) {
 491         error_setg(errp, "remote port not specified");
 492         goto err;
 493     }
 494
 495     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 496         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 497                    gai_strerror(rc));
 498         goto err;
 499     }
 500
 501     /* lookup local addr */
 502     memset(&ai,0, sizeof(ai));
 503     ai.ai_flags = AI_PASSIVE;
 504     ai.ai_family = peer->ai_family;
 505     ai.ai_socktype = SOCK_DGRAM;
 506
 507     if (sladdr) {
 508         addr = sladdr->host;
 509         port = sladdr->port;
 510         if (addr == NULL || strlen(addr) == 0) {
 511             addr = NULL;
 512         }
 513         if (!port || strlen(port) == 0) {
 514             port = "0";
 515         }
 516     } else {
 517         addr = NULL;
 518         port = "0";
 519     }
 520
 521     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 522         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 523                    gai_strerror(rc));
 524         goto err;
 525     }
 526
 527     /* create socket */
 528     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 529     if (sock < 0) {
 530         error_setg_errno(errp, errno, "Failed to create socket");
 531         goto err;
 532     }
 533     socket_set_fast_reuse(sock);
 534
 535     /* bind socket */
 536     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 537         error_setg_errno(errp, errno, "Failed to bind socket");
 538         goto err;
 539     }
 540
 541     /* connect to peer */
 542     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 543         error_setg_errno(errp, errno, "Failed to connect socket");
 544         goto err;
 545     }
 546
 547     freeaddrinfo(local);
 548     freeaddrinfo(peer);
 549     return sock;
 550
 551 err:
 552     if (sock != -1) {
 553         closesocket(sock);
 554     }
 555     if (local) {
 556         freeaddrinfo(local);
 557     }
 558     if (peer) {
 559         freeaddrinfo(peer);
 560     }
 561
 562     return -1;
 563 }
 564
 565 /* compatibility wrapper */
 566 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 567                            Error **errp)
 568 {
 569     char *end;
 570     size_t len;
 571
 572     end = strstr(optstr, ",");
 573     if (end) {
 574         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 575             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 576             return -1;
 577         }
 578         len = end - optstr;
 579     } else {
 580         len = strlen(optstr);
 581     }
 582     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 583         *val = true;
 584     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 585         *val = false;
 586     } else {
 587         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 588         return -1;
 589     }
 590     return 0;
 591 }
 592
 593 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 594 {
 595     const char *optstr, *h;
 596     char host[65];
 597     char port[33];
 598     int to;
 599     int pos;
 600     char *begin;
 601
 602     memset(addr, 0, sizeof(*addr));
 603
 604     /* parse address */
 605     if (str[0] == ':') {
 606         /* no host given */
 607         host[0] = '\0';
 608         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 609             error_setg(errp, "error parsing port in address '%s'", str);
 610             return -1;
 611         }
 612     } else if (str[0] == '[') {
 613         /* IPv6 addr */
 614         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 615             error_setg(errp, "error parsing IPv6 address '%s'", str);
 616             return -1;
 617         }
 618     } else {
 619         /* hostname or IPv4 addr */
 620         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 621             error_setg(errp, "error parsing address '%s'", str);
 622             return -1;
 623         }
 624     }
 625
 626     addr->host = g_strdup(host);
 627     addr->port = g_strdup(port);
 628
 629     /* parse options */
 630     optstr = str + pos;
 631     h = strstr(optstr, ",to=");
 632     if (h) {
 633         h += 4;
 634         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 635             (h[pos] != '\0' && h[pos] != ',')) {
 636             error_setg(errp, "error parsing to= argument");
 637             return -1;
 638         }
 639         addr->has_to = true;
 640         addr->to = to;
 641     }
 642     begin = strstr(optstr, ",ipv4");
 643     if (begin) {
 644         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 645             return -1;
 646         }
 647         addr->has_ipv4 = true;
 648     }
 649     begin = strstr(optstr, ",ipv6");
 650     if (begin) {
 651         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 652             return -1;
 653         }
 654         addr->has_ipv6 = true;
 655     }
 656     return 0;
 657 }
 658
 659
 660 /**
 661  * Create a blocking socket and connect it to an address.
 662  *
 663  * @str: address string
 664  * @errp: set in case of an error
 665  *
 666  * Returns -1 in case of error, file descriptor on success
 667  **/
 668 int inet_connect(const char *str, Error **errp)
 669 {
 670     int sock = -1;
 671     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 672
 673     if (!inet_parse(addr, str, errp)) {
 674         sock = inet_connect_saddr(addr, errp);
 675     }
 676     qapi_free_InetSocketAddress(addr);
 677     return sock;
 678 }
 679
 680 #ifdef CONFIG_AF_VSOCK
 681 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 682                                           struct sockaddr_vm *svm,
 683                                           Error **errp)
 684 {
 685     unsigned long long val;
 686
 687     memset(svm, 0, sizeof(*svm));
 688     svm->svm_family = AF_VSOCK;
 689
 690     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 691         val > UINT32_MAX) {
 692         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 693         return false;
 694     }
 695     svm->svm_cid = val;
 696
 697     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 698         val > UINT32_MAX) {
 699         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 700         return false;
 701     }
 702     svm->svm_port = val;
 703
 704     return true;
 705 }
 706
 707 static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp)
 708 {
 709     int sock, rc;
 710
 711     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 712     if (sock < 0) {
 713         error_setg_errno(errp, errno, "Failed to create socket");
 714         return -1;
 715     }
 716
 717     /* connect to peer */
 718     do {
 719         rc = 0;
 720         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 721             rc = -errno;
 722         }
 723     } while (rc == -EINTR);
 724
 725     if (rc < 0) {
 726         error_setg_errno(errp, errno, "Failed to connect socket");
 727         closesocket(sock);
 728         return -1;
 729     }
 730
 731     return sock;
 732 }
 733
 734 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 735 {
 736     struct sockaddr_vm svm;
 737     int sock = -1;
 738
 739     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 740         return -1;
 741     }
 742
 743     sock = vsock_connect_addr(&svm, errp);
 744
 745     return sock;
 746 }
 747
 748 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 749                               Error **errp)
 750 {
 751     struct sockaddr_vm svm;
 752     int slisten;
 753
 754     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 755         return -1;
 756     }
 757
 758     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 759     if (slisten < 0) {
 760         error_setg_errno(errp, errno, "Failed to create socket");
 761         return -1;
 762     }
 763
 764     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 765         error_setg_errno(errp, errno, "Failed to bind socket");
 766         closesocket(slisten);
 767         return -1;
 768     }
 769
 770     if (listen(slisten, 1) != 0) {
 771         error_setg_errno(errp, errno, "Failed to listen on socket");
 772         closesocket(slisten);
 773         return -1;
 774     }
 775     return slisten;
 776 }
 777
 778 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 779                        Error **errp)
 780 {
 781     char cid[33];
 782     char port[33];
 783     int n;
 784
 785     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 786         error_setg(errp, "error parsing address '%s'", str);
 787         return -1;
 788     }
 789     if (str[n] != '\0') {
 790         error_setg(errp, "trailing characters in address '%s'", str);
 791         return -1;
 792     }
 793
 794     addr->cid = g_strdup(cid);
 795     addr->port = g_strdup(port);
 796     return 0;
 797 }
 798 #else
 799 static void vsock_unsupported(Error **errp)
 800 {
 801     error_setg(errp, "socket family AF_VSOCK unsupported");
 802 }
 803
 804 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 805 {
 806     vsock_unsupported(errp);
 807     return -1;
 808 }
 809
 810 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 811                               Error **errp)
 812 {
 813     vsock_unsupported(errp);
 814     return -1;
 815 }
 816
 817 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 818                         Error **errp)
 819 {
 820     vsock_unsupported(errp);
 821     return -1;
 822 }
 823 #endif /* CONFIG_AF_VSOCK */
 824
 825 #ifndef _WIN32
 826
 827 static int unix_listen_saddr(UnixSocketAddress *saddr,
 828                              Error **errp)
 829 {
 830     struct sockaddr_un un;
 831     int sock, fd;
 832     char *pathbuf = NULL;
 833     const char *path;
 834     size_t pathlen;
 835
 836     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 837     if (sock < 0) {
 838         error_setg_errno(errp, errno, "Failed to create Unix socket");
 839         return -1;
 840     }
 841
 842     if (saddr->path && saddr->path[0]) {
 843         path = saddr->path;
 844     } else {
 845         const char *tmpdir = getenv("TMPDIR");
 846         tmpdir = tmpdir ? tmpdir : "/tmp";
 847         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 848     }
 849
 850     pathlen = strlen(path);
 851     if (pathlen > sizeof(un.sun_path)) {
 852         error_setg(errp, "UNIX socket path '%s' is too long", path);
 853         error_append_hint(errp, "Path must be less than %zu bytes\n",
 854                           sizeof(un.sun_path));
 855         goto err;
 856     }
 857
 858     if (pathbuf != NULL) {
 859         /*
 860          * This dummy fd usage silences the mktemp() unsecure warning.
 861          * Using mkstemp() doesn't make things more secure here
 862          * though.  bind() complains about existing files, so we have
 863          * to unlink first and thus re-open the race window.  The
 864          * worst case possible is bind() failing, i.e. a DoS attack.
 865          */
 866         fd = mkstemp(pathbuf);
 867         if (fd < 0) {
 868             error_setg_errno(errp, errno,
 869                              "Failed to make a temporary socket %s", pathbuf);
 870             goto err;
 871         }
 872         close(fd);
 873     }
 874
 875     if (unlink(path) < 0 && errno != ENOENT) {
 876         error_setg_errno(errp, errno,
 877                          "Failed to unlink socket %s", path);
 878         goto err;
 879     }
 880
 881     memset(&un, 0, sizeof(un));
 882     un.sun_family = AF_UNIX;
 883     memcpy(un.sun_path, path, pathlen);
 884
 885     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 886         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 887         goto err;
 888     }
 889     if (listen(sock, 1) < 0) {
 890         error_setg_errno(errp, errno, "Failed to listen on socket");
 891         goto err;
 892     }
 893
 894     g_free(pathbuf);
 895     return sock;
 896
 897 err:
 898     g_free(pathbuf);
 899     closesocket(sock);
 900     return -1;
 901 }
 902
 903 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 904 {
 905     struct sockaddr_un un;
 906     int sock, rc;
 907     size_t pathlen;
 908
 909     if (saddr->path == NULL) {
 910         error_setg(errp, "unix connect: no path specified");
 911         return -1;
 912     }
 913
 914     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 915     if (sock < 0) {
 916         error_setg_errno(errp, errno, "Failed to create socket");
 917         return -1;
 918     }
 919
 920     pathlen = strlen(saddr->path);
 921     if (pathlen > sizeof(un.sun_path)) {
 922         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
 923         error_append_hint(errp, "Path must be less than %zu bytes\n",
 924                           sizeof(un.sun_path));
 925         goto err;
 926     }
 927
 928     memset(&un, 0, sizeof(un));
 929     un.sun_family = AF_UNIX;
 930     memcpy(un.sun_path, saddr->path, pathlen);
 931
 932     /* connect to peer */
 933     do {
 934         rc = 0;
 935         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 936             rc = -errno;
 937         }
 938     } while (rc == -EINTR);
 939
 940     if (rc < 0) {
 941         error_setg_errno(errp, -rc, "Failed to connect socket %s",
 942                          saddr->path);
 943         goto err;
 944     }
 945
 946     return sock;
 947
 948  err:
 949     close(sock);
 950     return -1;
 951 }
 952
 953 #else
 954
 955 static int unix_listen_saddr(UnixSocketAddress *saddr,
 956                              Error **errp)
 957 {
 958     error_setg(errp, "unix sockets are not available on windows");
 959     errno = ENOTSUP;
 960     return -1;
 961 }
 962
 963 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 964 {
 965     error_setg(errp, "unix sockets are not available on windows");
 966     errno = ENOTSUP;
 967     return -1;
 968 }
 969 #endif
 970
 971 /* compatibility wrapper */
 972 int unix_listen(const char *str, Error **errp)
 973 {
 974     UnixSocketAddress *saddr;
 975     int sock;
 976
 977     saddr = g_new0(UnixSocketAddress, 1);
 978     saddr->path = g_strdup(str);
 979     sock = unix_listen_saddr(saddr, errp);
 980     qapi_free_UnixSocketAddress(saddr);
 981     return sock;
 982 }
 983
 984 int unix_connect(const char *path, Error **errp)
 985 {
 986     UnixSocketAddress *saddr;
 987     int sock;
 988
 989     saddr = g_new0(UnixSocketAddress, 1);
 990     saddr->path = g_strdup(path);
 991     sock = unix_connect_saddr(saddr, errp);
 992     qapi_free_UnixSocketAddress(saddr);
 993     return sock;
 994 }
 995
 996
 997 SocketAddress *socket_parse(const char *str, Error **errp)
 998 {
 999     SocketAddress *addr;
1000
1001     addr = g_new0(SocketAddress, 1);
1002     if (strstart(str, "unix:", NULL)) {
1003         if (str[5] == '\0') {
1004             error_setg(errp, "invalid Unix socket address");
1005             goto fail;
1006         } else {
1007             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1008             addr->u.q_unix.path = g_strdup(str + 5);
1009         }
1010     } else if (strstart(str, "fd:", NULL)) {
1011         if (str[3] == '\0') {
1012             error_setg(errp, "invalid file descriptor address");
1013             goto fail;
1014         } else {
1015             addr->type = SOCKET_ADDRESS_TYPE_FD;
1016             addr->u.fd.str = g_strdup(str + 3);
1017         }
1018     } else if (strstart(str, "vsock:", NULL)) {
1019         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1020         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1021             goto fail;
1022         }
1023     } else {
1024         addr->type = SOCKET_ADDRESS_TYPE_INET;
1025         if (inet_parse(&addr->u.inet, str, errp)) {
1026             goto fail;
1027         }
1028     }
1029     return addr;
1030
1031 fail:
1032     qapi_free_SocketAddress(addr);
1033     return NULL;
1034 }
1035
1036 static int socket_get_fd(const char *fdstr, Error **errp)
1037 {
1038     int fd;
1039     if (cur_mon) {
1040         fd = monitor_get_fd(cur_mon, fdstr, errp);
1041         if (fd < 0) {
1042             return -1;
1043         }
1044     } else {
1045         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1046             error_setg_errno(errp, errno,
1047                              "Unable to parse FD number %s",
1048                              fdstr);
1049             return -1;
1050         }
1051     }
1052     if (!fd_is_socket(fd)) {
1053         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1054         close(fd);
1055         return -1;
1056     }
1057     return fd;
1058 }
1059
1060 int socket_connect(SocketAddress *addr, Error **errp)
1061 {
1062     int fd;
1063
1064     switch (addr->type) {
1065     case SOCKET_ADDRESS_TYPE_INET:
1066         fd = inet_connect_saddr(&addr->u.inet, errp);
1067         break;
1068
1069     case SOCKET_ADDRESS_TYPE_UNIX:
1070         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1071         break;
1072
1073     case SOCKET_ADDRESS_TYPE_FD:
1074         fd = socket_get_fd(addr->u.fd.str, errp);
1075         break;
1076
1077     case SOCKET_ADDRESS_TYPE_VSOCK:
1078         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1079         break;
1080
1081     default:
1082         abort();
1083     }
1084     return fd;
1085 }
1086
1087 int socket_listen(SocketAddress *addr, Error **errp)
1088 {
1089     int fd;
1090
1091     switch (addr->type) {
1092     case SOCKET_ADDRESS_TYPE_INET:
1093         fd = inet_listen_saddr(&addr->u.inet, 0, errp);
1094         break;
1095
1096     case SOCKET_ADDRESS_TYPE_UNIX:
1097         fd = unix_listen_saddr(&addr->u.q_unix, errp);
1098         break;
1099
1100     case SOCKET_ADDRESS_TYPE_FD:
1101         fd = socket_get_fd(addr->u.fd.str, errp);
1102         break;
1103
1104     case SOCKET_ADDRESS_TYPE_VSOCK:
1105         fd = vsock_listen_saddr(&addr->u.vsock, errp);
1106         break;
1107
1108     default:
1109         abort();
1110     }
1111     return fd;
1112 }
1113
1114 void socket_listen_cleanup(int fd, Error **errp)
1115 {
1116     SocketAddress *addr;
1117
1118     addr = socket_local_address(fd, errp);
1119     if (!addr) {
1120         return;
1121     }
1122
1123     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1124         && addr->u.q_unix.path) {
1125         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1126             error_setg_errno(errp, errno,
1127                              "Failed to unlink socket %s",
1128                              addr->u.q_unix.path);
1129         }
1130     }
1131
1132     qapi_free_SocketAddress(addr);
1133 }
1134
1135 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1136 {
1137     int fd;
1138
1139     /*
1140      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1141      * (although other address families can do SOCK_DGRAM, too)
1142      */
1143     switch (remote->type) {
1144     case SOCKET_ADDRESS_TYPE_INET:
1145         fd = inet_dgram_saddr(&remote->u.inet,
1146                               local ? &local->u.inet : NULL, errp);
1147         break;
1148
1149     default:
1150         error_setg(errp, "socket type unsupported for datagram");
1151         fd = -1;
1152     }
1153     return fd;
1154 }
1155
1156
1157 static SocketAddress *
1158 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1159                                 socklen_t salen,
1160                                 Error **errp)
1161 {
1162     char host[NI_MAXHOST];
1163     char serv[NI_MAXSERV];
1164     SocketAddress *addr;
1165     InetSocketAddress *inet;
1166     int ret;
1167
1168     ret = getnameinfo((struct sockaddr *)sa, salen,
1169                       host, sizeof(host),
1170                       serv, sizeof(serv),
1171                       NI_NUMERICHOST | NI_NUMERICSERV);
1172     if (ret != 0) {
1173         error_setg(errp, "Cannot format numeric socket address: %s",
1174                    gai_strerror(ret));
1175         return NULL;
1176     }
1177
1178     addr = g_new0(SocketAddress, 1);
1179     addr->type = SOCKET_ADDRESS_TYPE_INET;
1180     inet = &addr->u.inet;
1181     inet->host = g_strdup(host);
1182     inet->port = g_strdup(serv);
1183     if (sa->ss_family == AF_INET) {
1184         inet->has_ipv4 = inet->ipv4 = true;
1185     } else {
1186         inet->has_ipv6 = inet->ipv6 = true;
1187     }
1188
1189     return addr;
1190 }
1191
1192
1193 #ifndef WIN32
1194 static SocketAddress *
1195 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1196                                 socklen_t salen,
1197                                 Error **errp)
1198 {
1199     SocketAddress *addr;
1200     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1201
1202     addr = g_new0(SocketAddress, 1);
1203     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1204     if (su->sun_path[0]) {
1205         addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1206     }
1207
1208     return addr;
1209 }
1210 #endif /* WIN32 */
1211
1212 #ifdef CONFIG_AF_VSOCK
1213 static SocketAddress *
1214 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1215                                  socklen_t salen,
1216                                  Error **errp)
1217 {
1218     SocketAddress *addr;
1219     VsockSocketAddress *vaddr;
1220     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1221
1222     addr = g_new0(SocketAddress, 1);
1223     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1224     vaddr = &addr->u.vsock;
1225     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1226     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1227
1228     return addr;
1229 }
1230 #endif /* CONFIG_AF_VSOCK */
1231
1232 SocketAddress *
1233 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1234                            socklen_t salen,
1235                            Error **errp)
1236 {
1237     switch (sa->ss_family) {
1238     case AF_INET:
1239     case AF_INET6:
1240         return socket_sockaddr_to_address_inet(sa, salen, errp);
1241
1242 #ifndef WIN32
1243     case AF_UNIX:
1244         return socket_sockaddr_to_address_unix(sa, salen, errp);
1245 #endif /* WIN32 */
1246
1247 #ifdef CONFIG_AF_VSOCK
1248     case AF_VSOCK:
1249         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1250 #endif
1251
1252     default:
1253         error_setg(errp, "socket family %d unsupported",
1254                    sa->ss_family);
1255         return NULL;
1256     }
1257     return 0;
1258 }
1259
1260
1261 SocketAddress *socket_local_address(int fd, Error **errp)
1262 {
1263     struct sockaddr_storage ss;
1264     socklen_t sslen = sizeof(ss);
1265
1266     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1267         error_setg_errno(errp, errno, "%s",
1268                          "Unable to query local socket address");
1269         return NULL;
1270     }
1271
1272     return socket_sockaddr_to_address(&ss, sslen, errp);
1273 }
1274
1275
1276 SocketAddress *socket_remote_address(int fd, Error **errp)
1277 {
1278     struct sockaddr_storage ss;
1279     socklen_t sslen = sizeof(ss);
1280
1281     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1282         error_setg_errno(errp, errno, "%s",
1283                          "Unable to query remote socket address");
1284         return NULL;
1285     }
1286
1287     return socket_sockaddr_to_address(&ss, sslen, errp);
1288 }
1289
1290
1291 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1292 {
1293     SocketAddress *addr;
1294
1295     if (!addr_legacy) {
1296         return NULL;
1297     }
1298
1299     addr = g_new(SocketAddress, 1);
1300
1301     switch (addr_legacy->type) {
1302     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1303         addr->type = SOCKET_ADDRESS_TYPE_INET;
1304         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1305                            addr_legacy->u.inet.data);
1306         break;
1307     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1308         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1309         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1310                            addr_legacy->u.q_unix.data);
1311         break;
1312     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1313         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1314         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1315                            addr_legacy->u.vsock.data);
1316         break;
1317     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1318         addr->type = SOCKET_ADDRESS_TYPE_FD;
1319         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1320         break;
1321     default:
1322         abort();
1323     }
1324
1325     return addr;
1326 }