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 #ifdef IPPROTO_MPTCP
 282         if (saddr->has_mptcp && saddr->mptcp) {
 283             e->ai_protocol = IPPROTO_MPTCP;
 284         }
 285 #endif
 286         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 287                         uaddr,INET6_ADDRSTRLEN,uport,32,
 288                         NI_NUMERICHOST | NI_NUMERICSERV);
 289
 290         port_min = inet_getport(e);
 291         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 292         for (p = port_min; p <= port_max; p++) {
 293             inet_setport(e, p);
 294
 295             slisten = create_fast_reuse_socket(e);
 296             if (slisten < 0) {
 297                 /* First time we expect we might fail to create the socket
 298                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 299                  * Later iterations should always succeed if first iteration
 300                  * worked though, so treat that as fatal.
 301                  */
 302                 if (p == port_min) {
 303                     continue;
 304                 } else {
 305                     error_setg_errno(errp, errno,
 306                                      "Failed to recreate failed listening socket");
 307                     goto listen_failed;
 308                 }
 309             }
 310             socket_created = true;
 311
 312             rc = try_bind(slisten, saddr, e);
 313             if (rc < 0) {
 314                 if (errno != EADDRINUSE) {
 315                     error_setg_errno(errp, errno, "Failed to bind socket");
 316                     goto listen_failed;
 317                 }
 318             } else {
 319                 if (!listen(slisten, num)) {
 320                     goto listen_ok;
 321                 }
 322                 if (errno != EADDRINUSE) {
 323                     error_setg_errno(errp, errno, "Failed to listen on socket");
 324                     goto listen_failed;
 325                 }
 326             }
 327             /* Someone else managed to bind to the same port and beat us
 328              * to listen on it! Socket semantics does not allow us to
 329              * recover from this situation, so we need to recreate the
 330              * socket to allow bind attempts for subsequent ports:
 331              */
 332             closesocket(slisten);
 333             slisten = -1;
 334         }
 335     }
 336     error_setg_errno(errp, errno,
 337                      socket_created ?
 338                      "Failed to find an available port" :
 339                      "Failed to create a socket");
 340 listen_failed:
 341     saved_errno = errno;
 342     if (slisten >= 0) {
 343         closesocket(slisten);
 344     }
 345     freeaddrinfo(res);
 346     errno = saved_errno;
 347     return -1;
 348
 349 listen_ok:
 350     freeaddrinfo(res);
 351     return slisten;
 352 }
 353
 354 #ifdef _WIN32
 355 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 356     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 357 #else
 358 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 359     ((rc) == -EINPROGRESS)
 360 #endif
 361
 362 static int inet_connect_addr(const InetSocketAddress *saddr,
 363                              struct addrinfo *addr, Error **errp)
 364 {
 365     int sock, rc;
 366
 367     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 368     if (sock < 0) {
 369         error_setg_errno(errp, errno, "Failed to create socket family %d",
 370                          addr->ai_family);
 371         return -1;
 372     }
 373     socket_set_fast_reuse(sock);
 374
 375     /* connect to peer */
 376     do {
 377         rc = 0;
 378         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 379             rc = -errno;
 380         }
 381     } while (rc == -EINTR);
 382
 383     if (rc < 0) {
 384         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 385                          saddr->host, saddr->port);
 386         closesocket(sock);
 387         return -1;
 388     }
 389
 390     return sock;
 391 }
 392
 393 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 394                                                  Error **errp)
 395 {
 396     struct addrinfo ai, *res;
 397     int rc;
 398     Error *err = NULL;
 399     static int useV4Mapped = 1;
 400
 401     memset(&ai, 0, sizeof(ai));
 402
 403     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 404     if (qatomic_read(&useV4Mapped)) {
 405         ai.ai_flags |= AI_V4MAPPED;
 406     }
 407     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 408     ai.ai_socktype = SOCK_STREAM;
 409
 410     if (err) {
 411         error_propagate(errp, err);
 412         return NULL;
 413     }
 414
 415     if (saddr->host == NULL || saddr->port == NULL) {
 416         error_setg(errp, "host and/or port not specified");
 417         return NULL;
 418     }
 419
 420     /* lookup */
 421     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 422
 423     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 424      * then don't implement it in their getaddrinfo(). Detect
 425      * this and retry without the flag since that's preferable
 426      * to a fatal error
 427      */
 428     if (rc == EAI_BADFLAGS &&
 429         (ai.ai_flags & AI_V4MAPPED)) {
 430         qatomic_set(&useV4Mapped, 0);
 431         ai.ai_flags &= ~AI_V4MAPPED;
 432         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 433     }
 434     if (rc != 0) {
 435         error_setg(errp, "address resolution failed for %s:%s: %s",
 436                    saddr->host, saddr->port, gai_strerror(rc));
 437         return NULL;
 438     }
 439     return res;
 440 }
 441
 442 /**
 443  * Create a socket and connect it to an address.
 444  *
 445  * @saddr: Inet socket address specification
 446  * @errp: set on error
 447  *
 448  * Returns: -1 on error, file descriptor on success.
 449  */
 450 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 451 {
 452     Error *local_err = NULL;
 453     struct addrinfo *res, *e;
 454     int sock = -1;
 455
 456     res = inet_parse_connect_saddr(saddr, errp);
 457     if (!res) {
 458         return -1;
 459     }
 460
 461     for (e = res; e != NULL; e = e->ai_next) {
 462         error_free(local_err);
 463         local_err = NULL;
 464
 465 #ifdef IPPROTO_MPTCP
 466         if (saddr->has_mptcp && saddr->mptcp) {
 467             e->ai_protocol = IPPROTO_MPTCP;
 468         }
 469 #endif
 470
 471         sock = inet_connect_addr(saddr, e, &local_err);
 472         if (sock >= 0) {
 473             break;
 474         }
 475     }
 476
 477     freeaddrinfo(res);
 478
 479     if (sock < 0) {
 480         error_propagate(errp, local_err);
 481         return sock;
 482     }
 483
 484     if (saddr->keep_alive) {
 485         int val = 1;
 486         int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 487                                   &val, sizeof(val));
 488
 489         if (ret < 0) {
 490             error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
 491             close(sock);
 492             return -1;
 493         }
 494     }
 495
 496     return sock;
 497 }
 498
 499 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 500                             InetSocketAddress *sladdr,
 501                             Error **errp)
 502 {
 503     struct addrinfo ai, *peer = NULL, *local = NULL;
 504     const char *addr;
 505     const char *port;
 506     int sock = -1, rc;
 507     Error *err = NULL;
 508
 509     /* lookup peer addr */
 510     memset(&ai,0, sizeof(ai));
 511     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 512     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 513     ai.ai_socktype = SOCK_DGRAM;
 514
 515     if (err) {
 516         error_propagate(errp, err);
 517         goto err;
 518     }
 519
 520     addr = sraddr->host;
 521     port = sraddr->port;
 522     if (addr == NULL || strlen(addr) == 0) {
 523         addr = "localhost";
 524     }
 525     if (port == NULL || strlen(port) == 0) {
 526         error_setg(errp, "remote port not specified");
 527         goto err;
 528     }
 529
 530     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 531         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 532                    gai_strerror(rc));
 533         goto err;
 534     }
 535
 536     /* lookup local addr */
 537     memset(&ai,0, sizeof(ai));
 538     ai.ai_flags = AI_PASSIVE;
 539     ai.ai_family = peer->ai_family;
 540     ai.ai_socktype = SOCK_DGRAM;
 541
 542     if (sladdr) {
 543         addr = sladdr->host;
 544         port = sladdr->port;
 545         if (addr == NULL || strlen(addr) == 0) {
 546             addr = NULL;
 547         }
 548         if (!port || strlen(port) == 0) {
 549             port = "0";
 550         }
 551     } else {
 552         addr = NULL;
 553         port = "0";
 554     }
 555
 556     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 557         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 558                    gai_strerror(rc));
 559         goto err;
 560     }
 561
 562     /* create socket */
 563     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 564     if (sock < 0) {
 565         error_setg_errno(errp, errno, "Failed to create socket family %d",
 566                          peer->ai_family);
 567         goto err;
 568     }
 569     socket_set_fast_reuse(sock);
 570
 571     /* bind socket */
 572     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 573         error_setg_errno(errp, errno, "Failed to bind socket");
 574         goto err;
 575     }
 576
 577     /* connect to peer */
 578     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 579         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 580                          addr, port);
 581         goto err;
 582     }
 583
 584     freeaddrinfo(local);
 585     freeaddrinfo(peer);
 586     return sock;
 587
 588 err:
 589     if (sock != -1) {
 590         closesocket(sock);
 591     }
 592     if (local) {
 593         freeaddrinfo(local);
 594     }
 595     if (peer) {
 596         freeaddrinfo(peer);
 597     }
 598
 599     return -1;
 600 }
 601
 602 /* compatibility wrapper */
 603 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 604                            Error **errp)
 605 {
 606     char *end;
 607     size_t len;
 608
 609     end = strstr(optstr, ",");
 610     if (end) {
 611         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 612             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 613             return -1;
 614         }
 615         len = end - optstr;
 616     } else {
 617         len = strlen(optstr);
 618     }
 619     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 620         *val = true;
 621     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 622         *val = false;
 623     } else {
 624         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 625         return -1;
 626     }
 627     return 0;
 628 }
 629
 630 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 631 {
 632     const char *optstr, *h;
 633     char host[65];
 634     char port[33];
 635     int to;
 636     int pos;
 637     char *begin;
 638
 639     memset(addr, 0, sizeof(*addr));
 640
 641     /* parse address */
 642     if (str[0] == ':') {
 643         /* no host given */
 644         host[0] = '\0';
 645         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 646             error_setg(errp, "error parsing port in address '%s'", str);
 647             return -1;
 648         }
 649     } else if (str[0] == '[') {
 650         /* IPv6 addr */
 651         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 652             error_setg(errp, "error parsing IPv6 address '%s'", str);
 653             return -1;
 654         }
 655     } else {
 656         /* hostname or IPv4 addr */
 657         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 658             error_setg(errp, "error parsing address '%s'", str);
 659             return -1;
 660         }
 661     }
 662
 663     addr->host = g_strdup(host);
 664     addr->port = g_strdup(port);
 665
 666     /* parse options */
 667     optstr = str + pos;
 668     h = strstr(optstr, ",to=");
 669     if (h) {
 670         h += 4;
 671         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 672             (h[pos] != '\0' && h[pos] != ',')) {
 673             error_setg(errp, "error parsing to= argument");
 674             return -1;
 675         }
 676         addr->has_to = true;
 677         addr->to = to;
 678     }
 679     begin = strstr(optstr, ",ipv4");
 680     if (begin) {
 681         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 682             return -1;
 683         }
 684         addr->has_ipv4 = true;
 685     }
 686     begin = strstr(optstr, ",ipv6");
 687     if (begin) {
 688         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 689             return -1;
 690         }
 691         addr->has_ipv6 = true;
 692     }
 693     begin = strstr(optstr, ",keep-alive");
 694     if (begin) {
 695         if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"),
 696                             &addr->keep_alive, errp) < 0)
 697         {
 698             return -1;
 699         }
 700         addr->has_keep_alive = true;
 701     }
 702 #ifdef IPPROTO_MPTCP
 703     begin = strstr(optstr, ",mptcp");
 704     if (begin) {
 705         if (inet_parse_flag("mptcp", begin + strlen(",mptcp"),
 706                             &addr->mptcp, errp) < 0)
 707         {
 708             return -1;
 709         }
 710         addr->has_mptcp = true;
 711     }
 712 #endif
 713     return 0;
 714 }
 715
 716
 717 /**
 718  * Create a blocking socket and connect it to an address.
 719  *
 720  * @str: address string
 721  * @errp: set in case of an error
 722  *
 723  * Returns -1 in case of error, file descriptor on success
 724  **/
 725 int inet_connect(const char *str, Error **errp)
 726 {
 727     int sock = -1;
 728     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 729
 730     if (!inet_parse(addr, str, errp)) {
 731         sock = inet_connect_saddr(addr, errp);
 732     }
 733     qapi_free_InetSocketAddress(addr);
 734     return sock;
 735 }
 736
 737 #ifdef CONFIG_AF_VSOCK
 738 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 739                                           struct sockaddr_vm *svm,
 740                                           Error **errp)
 741 {
 742     unsigned long long val;
 743
 744     memset(svm, 0, sizeof(*svm));
 745     svm->svm_family = AF_VSOCK;
 746
 747     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 748         val > UINT32_MAX) {
 749         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 750         return false;
 751     }
 752     svm->svm_cid = val;
 753
 754     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 755         val > UINT32_MAX) {
 756         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 757         return false;
 758     }
 759     svm->svm_port = val;
 760
 761     return true;
 762 }
 763
 764 static int vsock_connect_addr(const VsockSocketAddress *vaddr,
 765                               const struct sockaddr_vm *svm, Error **errp)
 766 {
 767     int sock, rc;
 768
 769     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 770     if (sock < 0) {
 771         error_setg_errno(errp, errno, "Failed to create socket family %d",
 772                          AF_VSOCK);
 773         return -1;
 774     }
 775
 776     /* connect to peer */
 777     do {
 778         rc = 0;
 779         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 780             rc = -errno;
 781         }
 782     } while (rc == -EINTR);
 783
 784     if (rc < 0) {
 785         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 786                          vaddr->cid, vaddr->port);
 787         closesocket(sock);
 788         return -1;
 789     }
 790
 791     return sock;
 792 }
 793
 794 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 795 {
 796     struct sockaddr_vm svm;
 797
 798     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 799         return -1;
 800     }
 801
 802     return vsock_connect_addr(vaddr, &svm, errp);
 803 }
 804
 805 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 806                               int num,
 807                               Error **errp)
 808 {
 809     struct sockaddr_vm svm;
 810     int slisten;
 811
 812     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 813         return -1;
 814     }
 815
 816     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 817     if (slisten < 0) {
 818         error_setg_errno(errp, errno, "Failed to create socket");
 819         return -1;
 820     }
 821
 822     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 823         error_setg_errno(errp, errno, "Failed to bind socket");
 824         closesocket(slisten);
 825         return -1;
 826     }
 827
 828     if (listen(slisten, num) != 0) {
 829         error_setg_errno(errp, errno, "Failed to listen on socket");
 830         closesocket(slisten);
 831         return -1;
 832     }
 833     return slisten;
 834 }
 835
 836 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 837                        Error **errp)
 838 {
 839     char cid[33];
 840     char port[33];
 841     int n;
 842
 843     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 844         error_setg(errp, "error parsing address '%s'", str);
 845         return -1;
 846     }
 847     if (str[n] != '\0') {
 848         error_setg(errp, "trailing characters in address '%s'", str);
 849         return -1;
 850     }
 851
 852     addr->cid = g_strdup(cid);
 853     addr->port = g_strdup(port);
 854     return 0;
 855 }
 856 #else
 857 static void vsock_unsupported(Error **errp)
 858 {
 859     error_setg(errp, "socket family AF_VSOCK unsupported");
 860 }
 861
 862 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 863 {
 864     vsock_unsupported(errp);
 865     return -1;
 866 }
 867
 868 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 869                               int num,
 870                               Error **errp)
 871 {
 872     vsock_unsupported(errp);
 873     return -1;
 874 }
 875
 876 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 877                         Error **errp)
 878 {
 879     vsock_unsupported(errp);
 880     return -1;
 881 }
 882 #endif /* CONFIG_AF_VSOCK */
 883
 884 #ifndef _WIN32
 885
 886 static bool saddr_is_abstract(UnixSocketAddress *saddr)
 887 {
 888 #ifdef CONFIG_LINUX
 889     return saddr->abstract;
 890 #else
 891     return false;
 892 #endif
 893 }
 894
 895 static bool saddr_is_tight(UnixSocketAddress *saddr)
 896 {
 897 #ifdef CONFIG_LINUX
 898     return !saddr->has_tight || saddr->tight;
 899 #else
 900     return false;
 901 #endif
 902 }
 903
 904 static int unix_listen_saddr(UnixSocketAddress *saddr,
 905                              int num,
 906                              Error **errp)
 907 {
 908     bool abstract = saddr_is_abstract(saddr);
 909     struct sockaddr_un un;
 910     int sock, fd;
 911     char *pathbuf = NULL;
 912     const char *path;
 913     size_t pathlen;
 914     size_t addrlen;
 915
 916     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 917     if (sock < 0) {
 918         error_setg_errno(errp, errno, "Failed to create Unix socket");
 919         return -1;
 920     }
 921
 922     if (saddr->path[0] || abstract) {
 923         path = saddr->path;
 924     } else {
 925         const char *tmpdir = getenv("TMPDIR");
 926         tmpdir = tmpdir ? tmpdir : "/tmp";
 927         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 928     }
 929
 930     pathlen = strlen(path);
 931     if (pathlen > sizeof(un.sun_path) ||
 932         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
 933         error_setg(errp, "UNIX socket path '%s' is too long", path);
 934         error_append_hint(errp, "Path must be less than %zu bytes\n",
 935                           abstract ? sizeof(un.sun_path) - 1 :
 936                           sizeof(un.sun_path));
 937         goto err;
 938     }
 939
 940     if (pathbuf != NULL) {
 941         /*
 942          * This dummy fd usage silences the mktemp() unsecure warning.
 943          * Using mkstemp() doesn't make things more secure here
 944          * though.  bind() complains about existing files, so we have
 945          * to unlink first and thus re-open the race window.  The
 946          * worst case possible is bind() failing, i.e. a DoS attack.
 947          */
 948         fd = mkstemp(pathbuf);
 949         if (fd < 0) {
 950             error_setg_errno(errp, errno,
 951                              "Failed to make a temporary socket %s", pathbuf);
 952             goto err;
 953         }
 954         close(fd);
 955     }
 956
 957     if (!abstract && unlink(path) < 0 && errno != ENOENT) {
 958         error_setg_errno(errp, errno,
 959                          "Failed to unlink socket %s", path);
 960         goto err;
 961     }
 962
 963     memset(&un, 0, sizeof(un));
 964     un.sun_family = AF_UNIX;
 965     addrlen = sizeof(un);
 966
 967     if (abstract) {
 968         un.sun_path[0] = '\0';
 969         memcpy(&un.sun_path[1], path, pathlen);
 970         if (saddr_is_tight(saddr)) {
 971             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
 972         }
 973     } else {
 974         memcpy(un.sun_path, path, pathlen);
 975     }
 976
 977     if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) {
 978         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 979         goto err;
 980     }
 981     if (listen(sock, num) < 0) {
 982         error_setg_errno(errp, errno, "Failed to listen on socket");
 983         goto err;
 984     }
 985
 986     g_free(pathbuf);
 987     return sock;
 988
 989 err:
 990     g_free(pathbuf);
 991     closesocket(sock);
 992     return -1;
 993 }
 994
 995 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 996 {
 997     bool abstract = saddr_is_abstract(saddr);
 998     struct sockaddr_un un;
 999     int sock, rc;
1000     size_t pathlen;
1001     size_t addrlen;
1002
1003     if (saddr->path == NULL) {
1004         error_setg(errp, "unix connect: no path specified");
1005         return -1;
1006     }
1007
1008     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
1009     if (sock < 0) {
1010         error_setg_errno(errp, errno, "Failed to create socket");
1011         return -1;
1012     }
1013
1014     pathlen = strlen(saddr->path);
1015     if (pathlen > sizeof(un.sun_path) ||
1016         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
1017         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
1018         error_append_hint(errp, "Path must be less than %zu bytes\n",
1019                           abstract ? sizeof(un.sun_path) - 1 :
1020                           sizeof(un.sun_path));
1021         goto err;
1022     }
1023
1024     memset(&un, 0, sizeof(un));
1025     un.sun_family = AF_UNIX;
1026     addrlen = sizeof(un);
1027
1028     if (abstract) {
1029         un.sun_path[0] = '\0';
1030         memcpy(&un.sun_path[1], saddr->path, pathlen);
1031         if (saddr_is_tight(saddr)) {
1032             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
1033         }
1034     } else {
1035         memcpy(un.sun_path, saddr->path, pathlen);
1036     }
1037     /* connect to peer */
1038     do {
1039         rc = 0;
1040         if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) {
1041             rc = -errno;
1042         }
1043     } while (rc == -EINTR);
1044
1045     if (rc < 0) {
1046         error_setg_errno(errp, -rc, "Failed to connect to '%s'",
1047                          saddr->path);
1048         goto err;
1049     }
1050
1051     return sock;
1052
1053  err:
1054     close(sock);
1055     return -1;
1056 }
1057
1058 #else
1059
1060 static int unix_listen_saddr(UnixSocketAddress *saddr,
1061                              int num,
1062                              Error **errp)
1063 {
1064     error_setg(errp, "unix sockets are not available on windows");
1065     errno = ENOTSUP;
1066     return -1;
1067 }
1068
1069 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
1070 {
1071     error_setg(errp, "unix sockets are not available on windows");
1072     errno = ENOTSUP;
1073     return -1;
1074 }
1075 #endif
1076
1077 /* compatibility wrapper */
1078 int unix_listen(const char *str, Error **errp)
1079 {
1080     UnixSocketAddress *saddr;
1081     int sock;
1082
1083     saddr = g_new0(UnixSocketAddress, 1);
1084     saddr->path = g_strdup(str);
1085     sock = unix_listen_saddr(saddr, 1, errp);
1086     qapi_free_UnixSocketAddress(saddr);
1087     return sock;
1088 }
1089
1090 int unix_connect(const char *path, Error **errp)
1091 {
1092     UnixSocketAddress *saddr;
1093     int sock;
1094
1095     saddr = g_new0(UnixSocketAddress, 1);
1096     saddr->path = g_strdup(path);
1097     sock = unix_connect_saddr(saddr, errp);
1098     qapi_free_UnixSocketAddress(saddr);
1099     return sock;
1100 }
1101
1102
1103 SocketAddress *socket_parse(const char *str, Error **errp)
1104 {
1105     SocketAddress *addr;
1106
1107     addr = g_new0(SocketAddress, 1);
1108     if (strstart(str, "unix:", NULL)) {
1109         if (str[5] == '\0') {
1110             error_setg(errp, "invalid Unix socket address");
1111             goto fail;
1112         } else {
1113             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1114             addr->u.q_unix.path = g_strdup(str + 5);
1115         }
1116     } else if (strstart(str, "fd:", NULL)) {
1117         if (str[3] == '\0') {
1118             error_setg(errp, "invalid file descriptor address");
1119             goto fail;
1120         } else {
1121             addr->type = SOCKET_ADDRESS_TYPE_FD;
1122             addr->u.fd.str = g_strdup(str + 3);
1123         }
1124     } else if (strstart(str, "vsock:", NULL)) {
1125         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1126         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1127             goto fail;
1128         }
1129     } else {
1130         addr->type = SOCKET_ADDRESS_TYPE_INET;
1131         if (inet_parse(&addr->u.inet, str, errp)) {
1132             goto fail;
1133         }
1134     }
1135     return addr;
1136
1137 fail:
1138     qapi_free_SocketAddress(addr);
1139     return NULL;
1140 }
1141
1142 static int socket_get_fd(const char *fdstr, Error **errp)
1143 {
1144     Monitor *cur_mon = monitor_cur();
1145     int fd;
1146     if (cur_mon) {
1147         fd = monitor_get_fd(cur_mon, fdstr, errp);
1148         if (fd < 0) {
1149             return -1;
1150         }
1151     } else {
1152         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1153             error_setg_errno(errp, errno,
1154                              "Unable to parse FD number %s",
1155                              fdstr);
1156             return -1;
1157         }
1158     }
1159     if (!fd_is_socket(fd)) {
1160         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1161         close(fd);
1162         return -1;
1163     }
1164     return fd;
1165 }
1166
1167 int socket_address_parse_named_fd(SocketAddress *addr, Error **errp)
1168 {
1169     int fd;
1170
1171     if (addr->type != SOCKET_ADDRESS_TYPE_FD) {
1172         return 0;
1173     }
1174
1175     fd = socket_get_fd(addr->u.fd.str, errp);
1176     if (fd < 0) {
1177         return fd;
1178     }
1179
1180     g_free(addr->u.fd.str);
1181     addr->u.fd.str = g_strdup_printf("%d", fd);
1182
1183     return 0;
1184 }
1185
1186 int socket_connect(SocketAddress *addr, Error **errp)
1187 {
1188     int fd;
1189
1190     switch (addr->type) {
1191     case SOCKET_ADDRESS_TYPE_INET:
1192         fd = inet_connect_saddr(&addr->u.inet, errp);
1193         break;
1194
1195     case SOCKET_ADDRESS_TYPE_UNIX:
1196         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1197         break;
1198
1199     case SOCKET_ADDRESS_TYPE_FD:
1200         fd = socket_get_fd(addr->u.fd.str, errp);
1201         break;
1202
1203     case SOCKET_ADDRESS_TYPE_VSOCK:
1204         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1205         break;
1206
1207     default:
1208         abort();
1209     }
1210     return fd;
1211 }
1212
1213 int socket_listen(SocketAddress *addr, int num, Error **errp)
1214 {
1215     int fd;
1216
1217     trace_socket_listen(num);
1218     switch (addr->type) {
1219     case SOCKET_ADDRESS_TYPE_INET:
1220         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1221         break;
1222
1223     case SOCKET_ADDRESS_TYPE_UNIX:
1224         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1225         break;
1226
1227     case SOCKET_ADDRESS_TYPE_FD:
1228         fd = socket_get_fd(addr->u.fd.str, errp);
1229         if (fd < 0) {
1230             return -1;
1231         }
1232
1233         /*
1234          * If the socket is not yet in the listen state, then transition it to
1235          * the listen state now.
1236          *
1237          * If it's already listening then this updates the backlog value as
1238          * requested.
1239          *
1240          * If this socket cannot listen because it's already in another state
1241          * (e.g. unbound or connected) then we'll catch the error here.
1242          */
1243         if (listen(fd, num) != 0) {
1244             error_setg_errno(errp, errno, "Failed to listen on fd socket");
1245             closesocket(fd);
1246             return -1;
1247         }
1248         break;
1249
1250     case SOCKET_ADDRESS_TYPE_VSOCK:
1251         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1252         break;
1253
1254     default:
1255         abort();
1256     }
1257     return fd;
1258 }
1259
1260 void socket_listen_cleanup(int fd, Error **errp)
1261 {
1262     SocketAddress *addr;
1263
1264     addr = socket_local_address(fd, errp);
1265     if (!addr) {
1266         return;
1267     }
1268
1269     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1270         && addr->u.q_unix.path) {
1271         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1272             error_setg_errno(errp, errno,
1273                              "Failed to unlink socket %s",
1274                              addr->u.q_unix.path);
1275         }
1276     }
1277
1278     qapi_free_SocketAddress(addr);
1279 }
1280
1281 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1282 {
1283     int fd;
1284
1285     /*
1286      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1287      * (although other address families can do SOCK_DGRAM, too)
1288      */
1289     switch (remote->type) {
1290     case SOCKET_ADDRESS_TYPE_INET:
1291         fd = inet_dgram_saddr(&remote->u.inet,
1292                               local ? &local->u.inet : NULL, errp);
1293         break;
1294
1295     default:
1296         error_setg(errp, "socket type unsupported for datagram");
1297         fd = -1;
1298     }
1299     return fd;
1300 }
1301
1302
1303 static SocketAddress *
1304 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1305                                 socklen_t salen,
1306                                 Error **errp)
1307 {
1308     char host[NI_MAXHOST];
1309     char serv[NI_MAXSERV];
1310     SocketAddress *addr;
1311     InetSocketAddress *inet;
1312     int ret;
1313
1314     ret = getnameinfo((struct sockaddr *)sa, salen,
1315                       host, sizeof(host),
1316                       serv, sizeof(serv),
1317                       NI_NUMERICHOST | NI_NUMERICSERV);
1318     if (ret != 0) {
1319         error_setg(errp, "Cannot format numeric socket address: %s",
1320                    gai_strerror(ret));
1321         return NULL;
1322     }
1323
1324     addr = g_new0(SocketAddress, 1);
1325     addr->type = SOCKET_ADDRESS_TYPE_INET;
1326     inet = &addr->u.inet;
1327     inet->host = g_strdup(host);
1328     inet->port = g_strdup(serv);
1329     if (sa->ss_family == AF_INET) {
1330         inet->has_ipv4 = inet->ipv4 = true;
1331     } else {
1332         inet->has_ipv6 = inet->ipv6 = true;
1333     }
1334
1335     return addr;
1336 }
1337
1338
1339 #ifndef WIN32
1340 static SocketAddress *
1341 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1342                                 socklen_t salen,
1343                                 Error **errp)
1344 {
1345     SocketAddress *addr;
1346     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1347
1348     addr = g_new0(SocketAddress, 1);
1349     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1350 #ifdef CONFIG_LINUX
1351     if (!su->sun_path[0]) {
1352         /* Linux abstract socket */
1353         addr->u.q_unix.path = g_strndup(su->sun_path + 1,
1354                                         sizeof(su->sun_path) - 1);
1355         addr->u.q_unix.has_abstract = true;
1356         addr->u.q_unix.abstract = true;
1357         addr->u.q_unix.has_tight = true;
1358         addr->u.q_unix.tight = salen < sizeof(*su);
1359         return addr;
1360     }
1361 #endif
1362
1363     addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1364     return addr;
1365 }
1366 #endif /* WIN32 */
1367
1368 #ifdef CONFIG_AF_VSOCK
1369 static SocketAddress *
1370 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1371                                  socklen_t salen,
1372                                  Error **errp)
1373 {
1374     SocketAddress *addr;
1375     VsockSocketAddress *vaddr;
1376     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1377
1378     addr = g_new0(SocketAddress, 1);
1379     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1380     vaddr = &addr->u.vsock;
1381     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1382     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1383
1384     return addr;
1385 }
1386 #endif /* CONFIG_AF_VSOCK */
1387
1388 SocketAddress *
1389 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1390                            socklen_t salen,
1391                            Error **errp)
1392 {
1393     switch (sa->ss_family) {
1394     case AF_INET:
1395     case AF_INET6:
1396         return socket_sockaddr_to_address_inet(sa, salen, errp);
1397
1398 #ifndef WIN32
1399     case AF_UNIX:
1400         return socket_sockaddr_to_address_unix(sa, salen, errp);
1401 #endif /* WIN32 */
1402
1403 #ifdef CONFIG_AF_VSOCK
1404     case AF_VSOCK:
1405         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1406 #endif
1407
1408     default:
1409         error_setg(errp, "socket family %d unsupported",
1410                    sa->ss_family);
1411         return NULL;
1412     }
1413     return 0;
1414 }
1415
1416
1417 SocketAddress *socket_local_address(int fd, Error **errp)
1418 {
1419     struct sockaddr_storage ss;
1420     socklen_t sslen = sizeof(ss);
1421
1422     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1423         error_setg_errno(errp, errno, "%s",
1424                          "Unable to query local socket address");
1425         return NULL;
1426     }
1427
1428     return socket_sockaddr_to_address(&ss, sslen, errp);
1429 }
1430
1431
1432 SocketAddress *socket_remote_address(int fd, Error **errp)
1433 {
1434     struct sockaddr_storage ss;
1435     socklen_t sslen = sizeof(ss);
1436
1437     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1438         error_setg_errno(errp, errno, "%s",
1439                          "Unable to query remote socket address");
1440         return NULL;
1441     }
1442
1443     return socket_sockaddr_to_address(&ss, sslen, errp);
1444 }
1445
1446
1447 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1448 {
1449     SocketAddress *addr;
1450
1451     if (!addr_legacy) {
1452         return NULL;
1453     }
1454
1455     addr = g_new(SocketAddress, 1);
1456
1457     switch (addr_legacy->type) {
1458     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1459         addr->type = SOCKET_ADDRESS_TYPE_INET;
1460         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1461                            addr_legacy->u.inet.data);
1462         break;
1463     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1464         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1465         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1466                            addr_legacy->u.q_unix.data);
1467         break;
1468     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1469         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1470         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1471                            addr_legacy->u.vsock.data);
1472         break;
1473     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1474         addr->type = SOCKET_ADDRESS_TYPE_FD;
1475         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1476         break;
1477     default:
1478         abort();
1479     }
1480
1481     return addr;
1482 }