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 #include "trace.h"
  35
  36 #ifndef AI_ADDRCONFIG
  37 # define AI_ADDRCONFIG 0
  38 #endif
  39
  40 #ifndef AI_V4MAPPED
  41 # define AI_V4MAPPED 0
  42 #endif
  43
  44 #ifndef AI_NUMERICSERV
  45 # define AI_NUMERICSERV 0
  46 #endif
  47
  48
  49 static int inet_getport(struct addrinfo *e)
  50 {
  51     struct sockaddr_in *i4;
  52     struct sockaddr_in6 *i6;
  53
  54     switch (e->ai_family) {
  55     case PF_INET6:
  56         i6 = (void*)e->ai_addr;
  57         return ntohs(i6->sin6_port);
  58     case PF_INET:
  59         i4 = (void*)e->ai_addr;
  60         return ntohs(i4->sin_port);
  61     default:
  62         return 0;
  63     }
  64 }
  65
  66 static void inet_setport(struct addrinfo *e, int port)
  67 {
  68     struct sockaddr_in *i4;
  69     struct sockaddr_in6 *i6;
  70
  71     switch (e->ai_family) {
  72     case PF_INET6:
  73         i6 = (void*)e->ai_addr;
  74         i6->sin6_port = htons(port);
  75         break;
  76     case PF_INET:
  77         i4 = (void*)e->ai_addr;
  78         i4->sin_port = htons(port);
  79         break;
  80     }
  81 }
  82
  83 NetworkAddressFamily inet_netfamily(int family)
  84 {
  85     switch (family) {
  86     case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
  87     case PF_INET:  return NETWORK_ADDRESS_FAMILY_IPV4;
  88     case PF_UNIX:  return NETWORK_ADDRESS_FAMILY_UNIX;
  89 #ifdef CONFIG_AF_VSOCK
  90     case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK;
  91 #endif /* CONFIG_AF_VSOCK */
  92     }
  93     return NETWORK_ADDRESS_FAMILY_UNKNOWN;
  94 }
  95
  96 bool fd_is_socket(int fd)
  97 {
  98     int optval;
  99     socklen_t optlen = sizeof(optval);
 100     return !qemu_getsockopt(fd, SOL_SOCKET, SO_TYPE, &optval, &optlen);
 101 }
 102
 103
 104 /*
 105  * Matrix we're trying to apply
 106  *
 107  *  ipv4  ipv6   family
 108  *   -     -       PF_UNSPEC
 109  *   -     f       PF_INET
 110  *   -     t       PF_INET6
 111  *   f     -       PF_INET6
 112  *   f     f       <error>
 113  *   f     t       PF_INET6
 114  *   t     -       PF_INET
 115  *   t     f       PF_INET
 116  *   t     t       PF_INET6/PF_UNSPEC
 117  *
 118  * NB, this matrix is only about getting the necessary results
 119  * from getaddrinfo(). Some of the cases require further work
 120  * after reading results from getaddrinfo in order to fully
 121  * apply the logic the end user wants.
 122  *
 123  * In the first and last cases, we must set IPV6_V6ONLY=0
 124  * when binding, to allow a single listener to potentially
 125  * accept both IPv4+6 addresses.
 126  */
 127 int inet_ai_family_from_address(InetSocketAddress *addr,
 128                                 Error **errp)
 129 {
 130     if (addr->has_ipv6 && addr->has_ipv4 &&
 131         !addr->ipv6 && !addr->ipv4) {
 132         error_setg(errp, "Cannot disable IPv4 and IPv6 at same time");
 133         return PF_UNSPEC;
 134     }
 135     if ((addr->has_ipv6 && addr->ipv6) && (addr->has_ipv4 && addr->ipv4)) {
 136         /*
 137          * Some backends can only do a single listener. In that case
 138          * we want empty hostname to resolve to "::" and then use the
 139          * flag IPV6_V6ONLY==0 to get both protocols on 1 socket. This
 140          * doesn't work for addresses other than "", so they're just
 141          * inevitably broken until multiple listeners can be used,
 142          * and thus we honour getaddrinfo automatic protocol detection
 143          * Once all backends do multi-listener, remove the PF_INET6
 144          * branch entirely.
 145          */
 146         if (!addr->host || g_str_equal(addr->host, "")) {
 147             return PF_INET6;
 148         } else {
 149             return PF_UNSPEC;
 150         }
 151     }
 152     if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) {
 153         return PF_INET6;
 154     }
 155     if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) {
 156         return PF_INET;
 157     }
 158     return PF_UNSPEC;
 159 }
 160
 161 static int create_fast_reuse_socket(struct addrinfo *e)
 162 {
 163     int slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 164     if (slisten < 0) {
 165         return -1;
 166     }
 167     socket_set_fast_reuse(slisten);
 168     return slisten;
 169 }
 170
 171 static int try_bind(int socket, InetSocketAddress *saddr, struct addrinfo *e)
 172 {
 173 #ifndef IPV6_V6ONLY
 174     return bind(socket, e->ai_addr, e->ai_addrlen);
 175 #else
 176     /*
 177      * Deals with first & last cases in matrix in comment
 178      * for inet_ai_family_from_address().
 179      */
 180     int v6only =
 181         ((!saddr->has_ipv4 && !saddr->has_ipv6) ||
 182          (saddr->has_ipv4 && saddr->ipv4 &&
 183           saddr->has_ipv6 && saddr->ipv6)) ? 0 : 1;
 184     int stat;
 185
 186  rebind:
 187     if (e->ai_family == PF_INET6) {
 188         qemu_setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, &v6only,
 189                         sizeof(v6only));
 190     }
 191
 192     stat = bind(socket, e->ai_addr, e->ai_addrlen);
 193     if (!stat) {
 194         return 0;
 195     }
 196
 197     /* If we got EADDRINUSE from an IPv6 bind & v6only is unset,
 198      * it could be that the IPv4 port is already claimed, so retry
 199      * with v6only set
 200      */
 201     if (e->ai_family == PF_INET6 && errno == EADDRINUSE && !v6only) {
 202         v6only = 1;
 203         goto rebind;
 204     }
 205     return stat;
 206 #endif
 207 }
 208
 209 static int inet_listen_saddr(InetSocketAddress *saddr,
 210                              int port_offset,
 211                              int num,
 212                              Error **errp)
 213 {
 214     struct addrinfo ai,*res,*e;
 215     char port[33];
 216     char uaddr[INET6_ADDRSTRLEN+1];
 217     char uport[33];
 218     int rc, port_min, port_max, p;
 219     int slisten = -1;
 220     int saved_errno = 0;
 221     bool socket_created = false;
 222     Error *err = NULL;
 223
 224     if (saddr->keep_alive) {
 225         error_setg(errp, "keep-alive option is not supported for passive "
 226                    "sockets");
 227         return -1;
 228     }
 229
 230     memset(&ai,0, sizeof(ai));
 231     ai.ai_flags = AI_PASSIVE;
 232     if (saddr->has_numeric && saddr->numeric) {
 233         ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
 234     }
 235     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 236     ai.ai_socktype = SOCK_STREAM;
 237
 238     if (err) {
 239         error_propagate(errp, err);
 240         return -1;
 241     }
 242
 243     if (saddr->host == NULL) {
 244         error_setg(errp, "host not specified");
 245         return -1;
 246     }
 247     if (saddr->port != NULL) {
 248         pstrcpy(port, sizeof(port), saddr->port);
 249     } else {
 250         port[0] = '\0';
 251     }
 252
 253     /* lookup */
 254     if (port_offset) {
 255         unsigned long long baseport;
 256         if (strlen(port) == 0) {
 257             error_setg(errp, "port not specified");
 258             return -1;
 259         }
 260         if (parse_uint_full(port, &baseport, 10) < 0) {
 261             error_setg(errp, "can't convert to a number: %s", port);
 262             return -1;
 263         }
 264         if (baseport > 65535 ||
 265             baseport + port_offset > 65535) {
 266             error_setg(errp, "port %s out of range", port);
 267             return -1;
 268         }
 269         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 270     }
 271     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 272                      strlen(port) ? port : NULL, &ai, &res);
 273     if (rc != 0) {
 274         error_setg(errp, "address resolution failed for %s:%s: %s",
 275                    saddr->host, port, gai_strerror(rc));
 276         return -1;
 277     }
 278
 279     /* create socket + bind/listen */
 280     for (e = res; e != NULL; e = e->ai_next) {
 281         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 282                         uaddr,INET6_ADDRSTRLEN,uport,32,
 283                         NI_NUMERICHOST | NI_NUMERICSERV);
 284
 285         port_min = inet_getport(e);
 286         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 287         for (p = port_min; p <= port_max; p++) {
 288             inet_setport(e, p);
 289
 290             slisten = create_fast_reuse_socket(e);
 291             if (slisten < 0) {
 292                 /* First time we expect we might fail to create the socket
 293                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 294                  * Later iterations should always succeed if first iteration
 295                  * worked though, so treat that as fatal.
 296                  */
 297                 if (p == port_min) {
 298                     continue;
 299                 } else {
 300                     error_setg_errno(errp, errno,
 301                                      "Failed to recreate failed listening socket");
 302                     goto listen_failed;
 303                 }
 304             }
 305             socket_created = true;
 306
 307             rc = try_bind(slisten, saddr, e);
 308             if (rc < 0) {
 309                 if (errno != EADDRINUSE) {
 310                     error_setg_errno(errp, errno, "Failed to bind socket");
 311                     goto listen_failed;
 312                 }
 313             } else {
 314                 if (!listen(slisten, num)) {
 315                     goto listen_ok;
 316                 }
 317                 if (errno != EADDRINUSE) {
 318                     error_setg_errno(errp, errno, "Failed to listen on socket");
 319                     goto listen_failed;
 320                 }
 321             }
 322             /* Someone else managed to bind to the same port and beat us
 323              * to listen on it! Socket semantics does not allow us to
 324              * recover from this situation, so we need to recreate the
 325              * socket to allow bind attempts for subsequent ports:
 326              */
 327             closesocket(slisten);
 328             slisten = -1;
 329         }
 330     }
 331     error_setg_errno(errp, errno,
 332                      socket_created ?
 333                      "Failed to find an available port" :
 334                      "Failed to create a socket");
 335 listen_failed:
 336     saved_errno = errno;
 337     if (slisten >= 0) {
 338         closesocket(slisten);
 339     }
 340     freeaddrinfo(res);
 341     errno = saved_errno;
 342     return -1;
 343
 344 listen_ok:
 345     freeaddrinfo(res);
 346     return slisten;
 347 }
 348
 349 #ifdef _WIN32
 350 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 351     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 352 #else
 353 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 354     ((rc) == -EINPROGRESS)
 355 #endif
 356
 357 static int inet_connect_addr(struct addrinfo *addr, Error **errp);
 358
 359 static int inet_connect_addr(struct addrinfo *addr, Error **errp)
 360 {
 361     int sock, rc;
 362
 363     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 364     if (sock < 0) {
 365         error_setg_errno(errp, errno, "Failed to create socket");
 366         return -1;
 367     }
 368     socket_set_fast_reuse(sock);
 369
 370     /* connect to peer */
 371     do {
 372         rc = 0;
 373         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 374             rc = -errno;
 375         }
 376     } while (rc == -EINTR);
 377
 378     if (rc < 0) {
 379         error_setg_errno(errp, errno, "Failed to connect socket");
 380         closesocket(sock);
 381         return -1;
 382     }
 383
 384     return sock;
 385 }
 386
 387 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 388                                                  Error **errp)
 389 {
 390     struct addrinfo ai, *res;
 391     int rc;
 392     Error *err = NULL;
 393     static int useV4Mapped = 1;
 394
 395     memset(&ai, 0, sizeof(ai));
 396
 397     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 398     if (atomic_read(&useV4Mapped)) {
 399         ai.ai_flags |= AI_V4MAPPED;
 400     }
 401     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 402     ai.ai_socktype = SOCK_STREAM;
 403
 404     if (err) {
 405         error_propagate(errp, err);
 406         return NULL;
 407     }
 408
 409     if (saddr->host == NULL || saddr->port == NULL) {
 410         error_setg(errp, "host and/or port not specified");
 411         return NULL;
 412     }
 413
 414     /* lookup */
 415     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 416
 417     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 418      * then don't implement it in their getaddrinfo(). Detect
 419      * this and retry without the flag since that's preferrable
 420      * to a fatal error
 421      */
 422     if (rc == EAI_BADFLAGS &&
 423         (ai.ai_flags & AI_V4MAPPED)) {
 424         atomic_set(&useV4Mapped, 0);
 425         ai.ai_flags &= ~AI_V4MAPPED;
 426         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 427     }
 428     if (rc != 0) {
 429         error_setg(errp, "address resolution failed for %s:%s: %s",
 430                    saddr->host, saddr->port, gai_strerror(rc));
 431         return NULL;
 432     }
 433     return res;
 434 }
 435
 436 /**
 437  * Create a socket and connect it to an address.
 438  *
 439  * @saddr: Inet socket address specification
 440  * @errp: set on error
 441  *
 442  * Returns: -1 on error, file descriptor on success.
 443  */
 444 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 445 {
 446     Error *local_err = NULL;
 447     struct addrinfo *res, *e;
 448     int sock = -1;
 449
 450     res = inet_parse_connect_saddr(saddr, errp);
 451     if (!res) {
 452         return -1;
 453     }
 454
 455     for (e = res; e != NULL; e = e->ai_next) {
 456         error_free(local_err);
 457         local_err = NULL;
 458         sock = inet_connect_addr(e, &local_err);
 459         if (sock >= 0) {
 460             break;
 461         }
 462     }
 463
 464     if (sock < 0) {
 465         error_propagate(errp, local_err);
 466     }
 467
 468     freeaddrinfo(res);
 469
 470     if (saddr->keep_alive) {
 471         int val = 1;
 472         int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 473                                   &val, sizeof(val));
 474
 475         if (ret < 0) {
 476             error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
 477             close(sock);
 478             return -1;
 479         }
 480     }
 481
 482     return sock;
 483 }
 484
 485 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 486                             InetSocketAddress *sladdr,
 487                             Error **errp)
 488 {
 489     struct addrinfo ai, *peer = NULL, *local = NULL;
 490     const char *addr;
 491     const char *port;
 492     int sock = -1, rc;
 493     Error *err = NULL;
 494
 495     /* lookup peer addr */
 496     memset(&ai,0, sizeof(ai));
 497     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 498     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 499     ai.ai_socktype = SOCK_DGRAM;
 500
 501     if (err) {
 502         error_propagate(errp, err);
 503         goto err;
 504     }
 505
 506     addr = sraddr->host;
 507     port = sraddr->port;
 508     if (addr == NULL || strlen(addr) == 0) {
 509         addr = "localhost";
 510     }
 511     if (port == NULL || strlen(port) == 0) {
 512         error_setg(errp, "remote port not specified");
 513         goto err;
 514     }
 515
 516     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 517         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 518                    gai_strerror(rc));
 519         goto err;
 520     }
 521
 522     /* lookup local addr */
 523     memset(&ai,0, sizeof(ai));
 524     ai.ai_flags = AI_PASSIVE;
 525     ai.ai_family = peer->ai_family;
 526     ai.ai_socktype = SOCK_DGRAM;
 527
 528     if (sladdr) {
 529         addr = sladdr->host;
 530         port = sladdr->port;
 531         if (addr == NULL || strlen(addr) == 0) {
 532             addr = NULL;
 533         }
 534         if (!port || strlen(port) == 0) {
 535             port = "0";
 536         }
 537     } else {
 538         addr = NULL;
 539         port = "0";
 540     }
 541
 542     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 543         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 544                    gai_strerror(rc));
 545         goto err;
 546     }
 547
 548     /* create socket */
 549     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 550     if (sock < 0) {
 551         error_setg_errno(errp, errno, "Failed to create socket");
 552         goto err;
 553     }
 554     socket_set_fast_reuse(sock);
 555
 556     /* bind socket */
 557     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 558         error_setg_errno(errp, errno, "Failed to bind socket");
 559         goto err;
 560     }
 561
 562     /* connect to peer */
 563     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 564         error_setg_errno(errp, errno, "Failed to connect socket");
 565         goto err;
 566     }
 567
 568     freeaddrinfo(local);
 569     freeaddrinfo(peer);
 570     return sock;
 571
 572 err:
 573     if (sock != -1) {
 574         closesocket(sock);
 575     }
 576     if (local) {
 577         freeaddrinfo(local);
 578     }
 579     if (peer) {
 580         freeaddrinfo(peer);
 581     }
 582
 583     return -1;
 584 }
 585
 586 /* compatibility wrapper */
 587 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 588                            Error **errp)
 589 {
 590     char *end;
 591     size_t len;
 592
 593     end = strstr(optstr, ",");
 594     if (end) {
 595         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 596             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 597             return -1;
 598         }
 599         len = end - optstr;
 600     } else {
 601         len = strlen(optstr);
 602     }
 603     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 604         *val = true;
 605     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 606         *val = false;
 607     } else {
 608         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 609         return -1;
 610     }
 611     return 0;
 612 }
 613
 614 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 615 {
 616     const char *optstr, *h;
 617     char host[65];
 618     char port[33];
 619     int to;
 620     int pos;
 621     char *begin;
 622
 623     memset(addr, 0, sizeof(*addr));
 624
 625     /* parse address */
 626     if (str[0] == ':') {
 627         /* no host given */
 628         host[0] = '\0';
 629         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 630             error_setg(errp, "error parsing port in address '%s'", str);
 631             return -1;
 632         }
 633     } else if (str[0] == '[') {
 634         /* IPv6 addr */
 635         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 636             error_setg(errp, "error parsing IPv6 address '%s'", str);
 637             return -1;
 638         }
 639     } else {
 640         /* hostname or IPv4 addr */
 641         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 642             error_setg(errp, "error parsing address '%s'", str);
 643             return -1;
 644         }
 645     }
 646
 647     addr->host = g_strdup(host);
 648     addr->port = g_strdup(port);
 649
 650     /* parse options */
 651     optstr = str + pos;
 652     h = strstr(optstr, ",to=");
 653     if (h) {
 654         h += 4;
 655         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 656             (h[pos] != '\0' && h[pos] != ',')) {
 657             error_setg(errp, "error parsing to= argument");
 658             return -1;
 659         }
 660         addr->has_to = true;
 661         addr->to = to;
 662     }
 663     begin = strstr(optstr, ",ipv4");
 664     if (begin) {
 665         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 666             return -1;
 667         }
 668         addr->has_ipv4 = true;
 669     }
 670     begin = strstr(optstr, ",ipv6");
 671     if (begin) {
 672         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 673             return -1;
 674         }
 675         addr->has_ipv6 = true;
 676     }
 677     begin = strstr(optstr, ",keep-alive");
 678     if (begin) {
 679         if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"),
 680                             &addr->keep_alive, errp) < 0)
 681         {
 682             return -1;
 683         }
 684         addr->has_keep_alive = true;
 685     }
 686     return 0;
 687 }
 688
 689
 690 /**
 691  * Create a blocking socket and connect it to an address.
 692  *
 693  * @str: address string
 694  * @errp: set in case of an error
 695  *
 696  * Returns -1 in case of error, file descriptor on success
 697  **/
 698 int inet_connect(const char *str, Error **errp)
 699 {
 700     int sock = -1;
 701     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 702
 703     if (!inet_parse(addr, str, errp)) {
 704         sock = inet_connect_saddr(addr, errp);
 705     }
 706     qapi_free_InetSocketAddress(addr);
 707     return sock;
 708 }
 709
 710 #ifdef CONFIG_AF_VSOCK
 711 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 712                                           struct sockaddr_vm *svm,
 713                                           Error **errp)
 714 {
 715     unsigned long long val;
 716
 717     memset(svm, 0, sizeof(*svm));
 718     svm->svm_family = AF_VSOCK;
 719
 720     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 721         val > UINT32_MAX) {
 722         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 723         return false;
 724     }
 725     svm->svm_cid = val;
 726
 727     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 728         val > UINT32_MAX) {
 729         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 730         return false;
 731     }
 732     svm->svm_port = val;
 733
 734     return true;
 735 }
 736
 737 static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp)
 738 {
 739     int sock, rc;
 740
 741     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 742     if (sock < 0) {
 743         error_setg_errno(errp, errno, "Failed to create socket");
 744         return -1;
 745     }
 746
 747     /* connect to peer */
 748     do {
 749         rc = 0;
 750         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 751             rc = -errno;
 752         }
 753     } while (rc == -EINTR);
 754
 755     if (rc < 0) {
 756         error_setg_errno(errp, errno, "Failed to connect socket");
 757         closesocket(sock);
 758         return -1;
 759     }
 760
 761     return sock;
 762 }
 763
 764 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 765 {
 766     struct sockaddr_vm svm;
 767     int sock = -1;
 768
 769     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 770         return -1;
 771     }
 772
 773     sock = vsock_connect_addr(&svm, errp);
 774
 775     return sock;
 776 }
 777
 778 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 779                               int num,
 780                               Error **errp)
 781 {
 782     struct sockaddr_vm svm;
 783     int slisten;
 784
 785     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 786         return -1;
 787     }
 788
 789     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 790     if (slisten < 0) {
 791         error_setg_errno(errp, errno, "Failed to create socket");
 792         return -1;
 793     }
 794
 795     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 796         error_setg_errno(errp, errno, "Failed to bind socket");
 797         closesocket(slisten);
 798         return -1;
 799     }
 800
 801     if (listen(slisten, num) != 0) {
 802         error_setg_errno(errp, errno, "Failed to listen on socket");
 803         closesocket(slisten);
 804         return -1;
 805     }
 806     return slisten;
 807 }
 808
 809 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 810                        Error **errp)
 811 {
 812     char cid[33];
 813     char port[33];
 814     int n;
 815
 816     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 817         error_setg(errp, "error parsing address '%s'", str);
 818         return -1;
 819     }
 820     if (str[n] != '\0') {
 821         error_setg(errp, "trailing characters in address '%s'", str);
 822         return -1;
 823     }
 824
 825     addr->cid = g_strdup(cid);
 826     addr->port = g_strdup(port);
 827     return 0;
 828 }
 829 #else
 830 static void vsock_unsupported(Error **errp)
 831 {
 832     error_setg(errp, "socket family AF_VSOCK unsupported");
 833 }
 834
 835 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 836 {
 837     vsock_unsupported(errp);
 838     return -1;
 839 }
 840
 841 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 842                               int num,
 843                               Error **errp)
 844 {
 845     vsock_unsupported(errp);
 846     return -1;
 847 }
 848
 849 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 850                         Error **errp)
 851 {
 852     vsock_unsupported(errp);
 853     return -1;
 854 }
 855 #endif /* CONFIG_AF_VSOCK */
 856
 857 #ifndef _WIN32
 858
 859 static int unix_listen_saddr(UnixSocketAddress *saddr,
 860                              int num,
 861                              Error **errp)
 862 {
 863     struct sockaddr_un un;
 864     int sock, fd;
 865     char *pathbuf = NULL;
 866     const char *path;
 867     size_t pathlen;
 868
 869     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 870     if (sock < 0) {
 871         error_setg_errno(errp, errno, "Failed to create Unix socket");
 872         return -1;
 873     }
 874
 875     if (saddr->path && saddr->path[0]) {
 876         path = saddr->path;
 877     } else {
 878         const char *tmpdir = getenv("TMPDIR");
 879         tmpdir = tmpdir ? tmpdir : "/tmp";
 880         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 881     }
 882
 883     pathlen = strlen(path);
 884     if (pathlen > sizeof(un.sun_path)) {
 885         error_setg(errp, "UNIX socket path '%s' is too long", path);
 886         error_append_hint(errp, "Path must be less than %zu bytes\n",
 887                           sizeof(un.sun_path));
 888         goto err;
 889     }
 890
 891     if (pathbuf != NULL) {
 892         /*
 893          * This dummy fd usage silences the mktemp() unsecure warning.
 894          * Using mkstemp() doesn't make things more secure here
 895          * though.  bind() complains about existing files, so we have
 896          * to unlink first and thus re-open the race window.  The
 897          * worst case possible is bind() failing, i.e. a DoS attack.
 898          */
 899         fd = mkstemp(pathbuf);
 900         if (fd < 0) {
 901             error_setg_errno(errp, errno,
 902                              "Failed to make a temporary socket %s", pathbuf);
 903             goto err;
 904         }
 905         close(fd);
 906     }
 907
 908     if (unlink(path) < 0 && errno != ENOENT) {
 909         error_setg_errno(errp, errno,
 910                          "Failed to unlink socket %s", path);
 911         goto err;
 912     }
 913
 914     memset(&un, 0, sizeof(un));
 915     un.sun_family = AF_UNIX;
 916     memcpy(un.sun_path, path, pathlen);
 917
 918     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 919         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 920         goto err;
 921     }
 922     if (listen(sock, num) < 0) {
 923         error_setg_errno(errp, errno, "Failed to listen on socket");
 924         goto err;
 925     }
 926
 927     g_free(pathbuf);
 928     return sock;
 929
 930 err:
 931     g_free(pathbuf);
 932     closesocket(sock);
 933     return -1;
 934 }
 935
 936 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 937 {
 938     struct sockaddr_un un;
 939     int sock, rc;
 940     size_t pathlen;
 941
 942     if (saddr->path == NULL) {
 943         error_setg(errp, "unix connect: no path specified");
 944         return -1;
 945     }
 946
 947     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 948     if (sock < 0) {
 949         error_setg_errno(errp, errno, "Failed to create socket");
 950         return -1;
 951     }
 952
 953     pathlen = strlen(saddr->path);
 954     if (pathlen > sizeof(un.sun_path)) {
 955         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
 956         error_append_hint(errp, "Path must be less than %zu bytes\n",
 957                           sizeof(un.sun_path));
 958         goto err;
 959     }
 960
 961     memset(&un, 0, sizeof(un));
 962     un.sun_family = AF_UNIX;
 963     memcpy(un.sun_path, saddr->path, pathlen);
 964
 965     /* connect to peer */
 966     do {
 967         rc = 0;
 968         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 969             rc = -errno;
 970         }
 971     } while (rc == -EINTR);
 972
 973     if (rc < 0) {
 974         error_setg_errno(errp, -rc, "Failed to connect socket %s",
 975                          saddr->path);
 976         goto err;
 977     }
 978
 979     return sock;
 980
 981  err:
 982     close(sock);
 983     return -1;
 984 }
 985
 986 #else
 987
 988 static int unix_listen_saddr(UnixSocketAddress *saddr,
 989                              int num,
 990                              Error **errp)
 991 {
 992     error_setg(errp, "unix sockets are not available on windows");
 993     errno = ENOTSUP;
 994     return -1;
 995 }
 996
 997 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 998 {
 999     error_setg(errp, "unix sockets are not available on windows");
1000     errno = ENOTSUP;
1001     return -1;
1002 }
1003 #endif
1004
1005 /* compatibility wrapper */
1006 int unix_listen(const char *str, Error **errp)
1007 {
1008     UnixSocketAddress *saddr;
1009     int sock;
1010
1011     saddr = g_new0(UnixSocketAddress, 1);
1012     saddr->path = g_strdup(str);
1013     sock = unix_listen_saddr(saddr, 1, errp);
1014     qapi_free_UnixSocketAddress(saddr);
1015     return sock;
1016 }
1017
1018 int unix_connect(const char *path, Error **errp)
1019 {
1020     UnixSocketAddress *saddr;
1021     int sock;
1022
1023     saddr = g_new0(UnixSocketAddress, 1);
1024     saddr->path = g_strdup(path);
1025     sock = unix_connect_saddr(saddr, errp);
1026     qapi_free_UnixSocketAddress(saddr);
1027     return sock;
1028 }
1029
1030
1031 SocketAddress *socket_parse(const char *str, Error **errp)
1032 {
1033     SocketAddress *addr;
1034
1035     addr = g_new0(SocketAddress, 1);
1036     if (strstart(str, "unix:", NULL)) {
1037         if (str[5] == '\0') {
1038             error_setg(errp, "invalid Unix socket address");
1039             goto fail;
1040         } else {
1041             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1042             addr->u.q_unix.path = g_strdup(str + 5);
1043         }
1044     } else if (strstart(str, "fd:", NULL)) {
1045         if (str[3] == '\0') {
1046             error_setg(errp, "invalid file descriptor address");
1047             goto fail;
1048         } else {
1049             addr->type = SOCKET_ADDRESS_TYPE_FD;
1050             addr->u.fd.str = g_strdup(str + 3);
1051         }
1052     } else if (strstart(str, "vsock:", NULL)) {
1053         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1054         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1055             goto fail;
1056         }
1057     } else {
1058         addr->type = SOCKET_ADDRESS_TYPE_INET;
1059         if (inet_parse(&addr->u.inet, str, errp)) {
1060             goto fail;
1061         }
1062     }
1063     return addr;
1064
1065 fail:
1066     qapi_free_SocketAddress(addr);
1067     return NULL;
1068 }
1069
1070 static int socket_get_fd(const char *fdstr, int num, Error **errp)
1071 {
1072     int fd;
1073     if (num != 1) {
1074         error_setg_errno(errp, EINVAL, "socket_get_fd: too many connections");
1075         return -1;
1076     }
1077     if (cur_mon) {
1078         fd = monitor_get_fd(cur_mon, fdstr, errp);
1079         if (fd < 0) {
1080             return -1;
1081         }
1082     } else {
1083         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1084             error_setg_errno(errp, errno,
1085                              "Unable to parse FD number %s",
1086                              fdstr);
1087             return -1;
1088         }
1089     }
1090     if (!fd_is_socket(fd)) {
1091         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1092         close(fd);
1093         return -1;
1094     }
1095     return fd;
1096 }
1097
1098 int socket_connect(SocketAddress *addr, Error **errp)
1099 {
1100     int fd;
1101
1102     switch (addr->type) {
1103     case SOCKET_ADDRESS_TYPE_INET:
1104         fd = inet_connect_saddr(&addr->u.inet, errp);
1105         break;
1106
1107     case SOCKET_ADDRESS_TYPE_UNIX:
1108         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1109         break;
1110
1111     case SOCKET_ADDRESS_TYPE_FD:
1112         fd = socket_get_fd(addr->u.fd.str, 1, errp);
1113         break;
1114
1115     case SOCKET_ADDRESS_TYPE_VSOCK:
1116         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1117         break;
1118
1119     default:
1120         abort();
1121     }
1122     return fd;
1123 }
1124
1125 int socket_listen(SocketAddress *addr, int num, Error **errp)
1126 {
1127     int fd;
1128
1129     trace_socket_listen(num);
1130     switch (addr->type) {
1131     case SOCKET_ADDRESS_TYPE_INET:
1132         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1133         break;
1134
1135     case SOCKET_ADDRESS_TYPE_UNIX:
1136         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1137         break;
1138
1139     case SOCKET_ADDRESS_TYPE_FD:
1140         fd = socket_get_fd(addr->u.fd.str, num, errp);
1141         break;
1142
1143     case SOCKET_ADDRESS_TYPE_VSOCK:
1144         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1145         break;
1146
1147     default:
1148         abort();
1149     }
1150     return fd;
1151 }
1152
1153 void socket_listen_cleanup(int fd, Error **errp)
1154 {
1155     SocketAddress *addr;
1156
1157     addr = socket_local_address(fd, errp);
1158     if (!addr) {
1159         return;
1160     }
1161
1162     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1163         && addr->u.q_unix.path) {
1164         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1165             error_setg_errno(errp, errno,
1166                              "Failed to unlink socket %s",
1167                              addr->u.q_unix.path);
1168         }
1169     }
1170
1171     qapi_free_SocketAddress(addr);
1172 }
1173
1174 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1175 {
1176     int fd;
1177
1178     /*
1179      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1180      * (although other address families can do SOCK_DGRAM, too)
1181      */
1182     switch (remote->type) {
1183     case SOCKET_ADDRESS_TYPE_INET:
1184         fd = inet_dgram_saddr(&remote->u.inet,
1185                               local ? &local->u.inet : NULL, errp);
1186         break;
1187
1188     default:
1189         error_setg(errp, "socket type unsupported for datagram");
1190         fd = -1;
1191     }
1192     return fd;
1193 }
1194
1195
1196 static SocketAddress *
1197 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1198                                 socklen_t salen,
1199                                 Error **errp)
1200 {
1201     char host[NI_MAXHOST];
1202     char serv[NI_MAXSERV];
1203     SocketAddress *addr;
1204     InetSocketAddress *inet;
1205     int ret;
1206
1207     ret = getnameinfo((struct sockaddr *)sa, salen,
1208                       host, sizeof(host),
1209                       serv, sizeof(serv),
1210                       NI_NUMERICHOST | NI_NUMERICSERV);
1211     if (ret != 0) {
1212         error_setg(errp, "Cannot format numeric socket address: %s",
1213                    gai_strerror(ret));
1214         return NULL;
1215     }
1216
1217     addr = g_new0(SocketAddress, 1);
1218     addr->type = SOCKET_ADDRESS_TYPE_INET;
1219     inet = &addr->u.inet;
1220     inet->host = g_strdup(host);
1221     inet->port = g_strdup(serv);
1222     if (sa->ss_family == AF_INET) {
1223         inet->has_ipv4 = inet->ipv4 = true;
1224     } else {
1225         inet->has_ipv6 = inet->ipv6 = true;
1226     }
1227
1228     return addr;
1229 }
1230
1231
1232 #ifndef WIN32
1233 static SocketAddress *
1234 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1235                                 socklen_t salen,
1236                                 Error **errp)
1237 {
1238     SocketAddress *addr;
1239     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1240
1241     addr = g_new0(SocketAddress, 1);
1242     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1243     if (su->sun_path[0]) {
1244         addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1245     }
1246
1247     return addr;
1248 }
1249 #endif /* WIN32 */
1250
1251 #ifdef CONFIG_AF_VSOCK
1252 static SocketAddress *
1253 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1254                                  socklen_t salen,
1255                                  Error **errp)
1256 {
1257     SocketAddress *addr;
1258     VsockSocketAddress *vaddr;
1259     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1260
1261     addr = g_new0(SocketAddress, 1);
1262     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1263     vaddr = &addr->u.vsock;
1264     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1265     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1266
1267     return addr;
1268 }
1269 #endif /* CONFIG_AF_VSOCK */
1270
1271 SocketAddress *
1272 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1273                            socklen_t salen,
1274                            Error **errp)
1275 {
1276     switch (sa->ss_family) {
1277     case AF_INET:
1278     case AF_INET6:
1279         return socket_sockaddr_to_address_inet(sa, salen, errp);
1280
1281 #ifndef WIN32
1282     case AF_UNIX:
1283         return socket_sockaddr_to_address_unix(sa, salen, errp);
1284 #endif /* WIN32 */
1285
1286 #ifdef CONFIG_AF_VSOCK
1287     case AF_VSOCK:
1288         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1289 #endif
1290
1291     default:
1292         error_setg(errp, "socket family %d unsupported",
1293                    sa->ss_family);
1294         return NULL;
1295     }
1296     return 0;
1297 }
1298
1299
1300 SocketAddress *socket_local_address(int fd, Error **errp)
1301 {
1302     struct sockaddr_storage ss;
1303     socklen_t sslen = sizeof(ss);
1304
1305     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1306         error_setg_errno(errp, errno, "%s",
1307                          "Unable to query local socket address");
1308         return NULL;
1309     }
1310
1311     return socket_sockaddr_to_address(&ss, sslen, errp);
1312 }
1313
1314
1315 SocketAddress *socket_remote_address(int fd, Error **errp)
1316 {
1317     struct sockaddr_storage ss;
1318     socklen_t sslen = sizeof(ss);
1319
1320     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1321         error_setg_errno(errp, errno, "%s",
1322                          "Unable to query remote socket address");
1323         return NULL;
1324     }
1325
1326     return socket_sockaddr_to_address(&ss, sslen, errp);
1327 }
1328
1329
1330 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1331 {
1332     SocketAddress *addr;
1333
1334     if (!addr_legacy) {
1335         return NULL;
1336     }
1337
1338     addr = g_new(SocketAddress, 1);
1339
1340     switch (addr_legacy->type) {
1341     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1342         addr->type = SOCKET_ADDRESS_TYPE_INET;
1343         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1344                            addr_legacy->u.inet.data);
1345         break;
1346     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1347         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1348         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1349                            addr_legacy->u.q_unix.data);
1350         break;
1351     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1352         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1353         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1354                            addr_legacy->u.vsock.data);
1355         break;
1356     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1357         addr->type = SOCKET_ADDRESS_TYPE_FD;
1358         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1359         break;
1360     default:
1361         abort();
1362     }
1363
1364     return addr;
1365 }