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 "monitor/monitor.h"
  25 #include "qapi/clone-visitor.h"
  26 #include "qapi/error.h"
  27 #include "qapi/qapi-visit-sockets.h"
  28 #include "qemu/sockets.h"
  29 #include "qemu/main-loop.h"
  30 #include "qapi/qobject-input-visitor.h"
  31 #include "qapi/qobject-output-visitor.h"
  32 #include "qemu/cutils.h"
  33 #include "trace.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 !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         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                              int num,
 211                              Error **errp)
 212 {
 213     struct addrinfo ai,*res,*e;
 214     char port[33];
 215     char uaddr[INET6_ADDRSTRLEN+1];
 216     char uport[33];
 217     int rc, port_min, port_max, p;
 218     int slisten = -1;
 219     int saved_errno = 0;
 220     bool socket_created = false;
 221     Error *err = NULL;
 222
 223     if (saddr->keep_alive) {
 224         error_setg(errp, "keep-alive option is not supported for passive "
 225                    "sockets");
 226         return -1;
 227     }
 228
 229     memset(&ai,0, sizeof(ai));
 230     ai.ai_flags = AI_PASSIVE;
 231     if (saddr->has_numeric && saddr->numeric) {
 232         ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
 233     }
 234     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 235     ai.ai_socktype = SOCK_STREAM;
 236
 237     if (err) {
 238         error_propagate(errp, err);
 239         return -1;
 240     }
 241
 242     if (saddr->host == NULL) {
 243         error_setg(errp, "host not specified");
 244         return -1;
 245     }
 246     if (saddr->port != NULL) {
 247         pstrcpy(port, sizeof(port), saddr->port);
 248     } else {
 249         port[0] = '\0';
 250     }
 251
 252     /* lookup */
 253     if (port_offset) {
 254         unsigned long long baseport;
 255         if (strlen(port) == 0) {
 256             error_setg(errp, "port not specified");
 257             return -1;
 258         }
 259         if (parse_uint_full(port, &baseport, 10) < 0) {
 260             error_setg(errp, "can't convert to a number: %s", port);
 261             return -1;
 262         }
 263         if (baseport > 65535 ||
 264             baseport + port_offset > 65535) {
 265             error_setg(errp, "port %s out of range", port);
 266             return -1;
 267         }
 268         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 269     }
 270     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 271                      strlen(port) ? port : NULL, &ai, &res);
 272     if (rc != 0) {
 273         error_setg(errp, "address resolution failed for %s:%s: %s",
 274                    saddr->host, port, gai_strerror(rc));
 275         return -1;
 276     }
 277
 278     /* create socket + bind/listen */
 279     for (e = res; e != NULL; e = e->ai_next) {
 280 #ifdef HAVE_IPPROTO_MPTCP
 281         if (saddr->has_mptcp && saddr->mptcp) {
 282             e->ai_protocol = IPPROTO_MPTCP;
 283         }
 284 #endif
 285         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 286                         uaddr,INET6_ADDRSTRLEN,uport,32,
 287                         NI_NUMERICHOST | NI_NUMERICSERV);
 288
 289         port_min = inet_getport(e);
 290         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 291         for (p = port_min; p <= port_max; p++) {
 292             inet_setport(e, p);
 293
 294             slisten = create_fast_reuse_socket(e);
 295             if (slisten < 0) {
 296                 /* First time we expect we might fail to create the socket
 297                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 298                  * Later iterations should always succeed if first iteration
 299                  * worked though, so treat that as fatal.
 300                  */
 301                 if (p == port_min) {
 302                     continue;
 303                 } else {
 304                     error_setg_errno(errp, errno,
 305                                      "Failed to recreate failed listening socket");
 306                     goto listen_failed;
 307                 }
 308             }
 309             socket_created = true;
 310
 311             rc = try_bind(slisten, saddr, e);
 312             if (rc < 0) {
 313                 if (errno != EADDRINUSE) {
 314                     error_setg_errno(errp, errno, "Failed to bind socket");
 315                     goto listen_failed;
 316                 }
 317             } else {
 318                 if (!listen(slisten, num)) {
 319                     goto listen_ok;
 320                 }
 321                 if (errno != EADDRINUSE) {
 322                     error_setg_errno(errp, errno, "Failed to listen on socket");
 323                     goto listen_failed;
 324                 }
 325             }
 326             /* Someone else managed to bind to the same port and beat us
 327              * to listen on it! Socket semantics does not allow us to
 328              * recover from this situation, so we need to recreate the
 329              * socket to allow bind attempts for subsequent ports:
 330              */
 331             closesocket(slisten);
 332             slisten = -1;
 333         }
 334     }
 335     error_setg_errno(errp, errno,
 336                      socket_created ?
 337                      "Failed to find an available port" :
 338                      "Failed to create a socket");
 339 listen_failed:
 340     saved_errno = errno;
 341     if (slisten >= 0) {
 342         closesocket(slisten);
 343     }
 344     freeaddrinfo(res);
 345     errno = saved_errno;
 346     return -1;
 347
 348 listen_ok:
 349     freeaddrinfo(res);
 350     return slisten;
 351 }
 352
 353 #ifdef _WIN32
 354 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 355     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 356 #else
 357 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 358     ((rc) == -EINPROGRESS)
 359 #endif
 360
 361 static int inet_connect_addr(const InetSocketAddress *saddr,
 362                              struct addrinfo *addr, Error **errp)
 363 {
 364     int sock, rc;
 365
 366     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 367     if (sock < 0) {
 368         error_setg_errno(errp, errno, "Failed to create socket family %d",
 369                          addr->ai_family);
 370         return -1;
 371     }
 372     socket_set_fast_reuse(sock);
 373
 374     /* connect to peer */
 375     do {
 376         rc = 0;
 377         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 378             rc = -errno;
 379         }
 380     } while (rc == -EINTR);
 381
 382     if (rc < 0) {
 383         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 384                          saddr->host, saddr->port);
 385         closesocket(sock);
 386         return -1;
 387     }
 388
 389     return sock;
 390 }
 391
 392 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 393                                                  Error **errp)
 394 {
 395     struct addrinfo ai, *res;
 396     int rc;
 397     Error *err = NULL;
 398     static int useV4Mapped = 1;
 399
 400     memset(&ai, 0, sizeof(ai));
 401
 402     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 403     if (qatomic_read(&useV4Mapped)) {
 404         ai.ai_flags |= AI_V4MAPPED;
 405     }
 406     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 407     ai.ai_socktype = SOCK_STREAM;
 408
 409     if (err) {
 410         error_propagate(errp, err);
 411         return NULL;
 412     }
 413
 414     if (saddr->host == NULL || saddr->port == NULL) {
 415         error_setg(errp, "host and/or port not specified");
 416         return NULL;
 417     }
 418
 419     /* lookup */
 420     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 421
 422     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 423      * then don't implement it in their getaddrinfo(). Detect
 424      * this and retry without the flag since that's preferable
 425      * to a fatal error
 426      */
 427     if (rc == EAI_BADFLAGS &&
 428         (ai.ai_flags & AI_V4MAPPED)) {
 429         qatomic_set(&useV4Mapped, 0);
 430         ai.ai_flags &= ~AI_V4MAPPED;
 431         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 432     }
 433     if (rc != 0) {
 434         error_setg(errp, "address resolution failed for %s:%s: %s",
 435                    saddr->host, saddr->port, gai_strerror(rc));
 436         return NULL;
 437     }
 438     return res;
 439 }
 440
 441 /**
 442  * Create a socket and connect it to an address.
 443  *
 444  * @saddr: Inet socket address specification
 445  * @errp: set on error
 446  *
 447  * Returns: -1 on error, file descriptor on success.
 448  */
 449 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 450 {
 451     Error *local_err = NULL;
 452     struct addrinfo *res, *e;
 453     int sock = -1;
 454
 455     res = inet_parse_connect_saddr(saddr, errp);
 456     if (!res) {
 457         return -1;
 458     }
 459
 460     for (e = res; e != NULL; e = e->ai_next) {
 461         error_free(local_err);
 462         local_err = NULL;
 463
 464 #ifdef HAVE_IPPROTO_MPTCP
 465         if (saddr->has_mptcp && saddr->mptcp) {
 466             e->ai_protocol = IPPROTO_MPTCP;
 467         }
 468 #endif
 469
 470         sock = inet_connect_addr(saddr, e, &local_err);
 471         if (sock >= 0) {
 472             break;
 473         }
 474     }
 475
 476     freeaddrinfo(res);
 477
 478     if (sock < 0) {
 479         error_propagate(errp, local_err);
 480         return sock;
 481     }
 482
 483     if (saddr->keep_alive) {
 484         int val = 1;
 485         int ret = setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 486                              &val, sizeof(val));
 487
 488         if (ret < 0) {
 489             error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
 490             close(sock);
 491             return -1;
 492         }
 493     }
 494
 495     return sock;
 496 }
 497
 498 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 499                             InetSocketAddress *sladdr,
 500                             Error **errp)
 501 {
 502     struct addrinfo ai, *peer = NULL, *local = NULL;
 503     const char *addr;
 504     const char *port;
 505     int sock = -1, rc;
 506     Error *err = NULL;
 507
 508     /* lookup peer addr */
 509     memset(&ai,0, sizeof(ai));
 510     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 511     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 512     ai.ai_socktype = SOCK_DGRAM;
 513
 514     if (err) {
 515         error_propagate(errp, err);
 516         goto err;
 517     }
 518
 519     addr = sraddr->host;
 520     port = sraddr->port;
 521     if (addr == NULL || strlen(addr) == 0) {
 522         addr = "localhost";
 523     }
 524     if (port == NULL || strlen(port) == 0) {
 525         error_setg(errp, "remote port not specified");
 526         goto err;
 527     }
 528
 529     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 530         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 531                    gai_strerror(rc));
 532         goto err;
 533     }
 534
 535     /* lookup local addr */
 536     memset(&ai,0, sizeof(ai));
 537     ai.ai_flags = AI_PASSIVE;
 538     ai.ai_family = peer->ai_family;
 539     ai.ai_socktype = SOCK_DGRAM;
 540
 541     if (sladdr) {
 542         addr = sladdr->host;
 543         port = sladdr->port;
 544         if (addr == NULL || strlen(addr) == 0) {
 545             addr = NULL;
 546         }
 547         if (!port || strlen(port) == 0) {
 548             port = "0";
 549         }
 550     } else {
 551         addr = NULL;
 552         port = "0";
 553     }
 554
 555     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 556         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 557                    gai_strerror(rc));
 558         goto err;
 559     }
 560
 561     /* create socket */
 562     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 563     if (sock < 0) {
 564         error_setg_errno(errp, errno, "Failed to create socket family %d",
 565                          peer->ai_family);
 566         goto err;
 567     }
 568     socket_set_fast_reuse(sock);
 569
 570     /* bind socket */
 571     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 572         error_setg_errno(errp, errno, "Failed to bind socket");
 573         goto err;
 574     }
 575
 576     /* connect to peer */
 577     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 578         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 579                          addr, port);
 580         goto err;
 581     }
 582
 583     freeaddrinfo(local);
 584     freeaddrinfo(peer);
 585     return sock;
 586
 587 err:
 588     if (sock != -1) {
 589         closesocket(sock);
 590     }
 591     if (local) {
 592         freeaddrinfo(local);
 593     }
 594     if (peer) {
 595         freeaddrinfo(peer);
 596     }
 597
 598     return -1;
 599 }
 600
 601 /* compatibility wrapper */
 602 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 603                            Error **errp)
 604 {
 605     char *end;
 606     size_t len;
 607
 608     end = strstr(optstr, ",");
 609     if (end) {
 610         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 611             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 612             return -1;
 613         }
 614         len = end - optstr;
 615     } else {
 616         len = strlen(optstr);
 617     }
 618     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 619         *val = true;
 620     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 621         *val = false;
 622     } else {
 623         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 624         return -1;
 625     }
 626     return 0;
 627 }
 628
 629 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 630 {
 631     const char *optstr, *h;
 632     char host[65];
 633     char port[33];
 634     int to;
 635     int pos;
 636     char *begin;
 637
 638     memset(addr, 0, sizeof(*addr));
 639
 640     /* parse address */
 641     if (str[0] == ':') {
 642         /* no host given */
 643         host[0] = '\0';
 644         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 645             error_setg(errp, "error parsing port in address '%s'", str);
 646             return -1;
 647         }
 648     } else if (str[0] == '[') {
 649         /* IPv6 addr */
 650         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 651             error_setg(errp, "error parsing IPv6 address '%s'", str);
 652             return -1;
 653         }
 654     } else {
 655         /* hostname or IPv4 addr */
 656         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 657             error_setg(errp, "error parsing address '%s'", str);
 658             return -1;
 659         }
 660     }
 661
 662     addr->host = g_strdup(host);
 663     addr->port = g_strdup(port);
 664
 665     /* parse options */
 666     optstr = str + pos;
 667     h = strstr(optstr, ",to=");
 668     if (h) {
 669         h += 4;
 670         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 671             (h[pos] != '\0' && h[pos] != ',')) {
 672             error_setg(errp, "error parsing to= argument");
 673             return -1;
 674         }
 675         addr->has_to = true;
 676         addr->to = to;
 677     }
 678     begin = strstr(optstr, ",ipv4");
 679     if (begin) {
 680         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 681             return -1;
 682         }
 683         addr->has_ipv4 = true;
 684     }
 685     begin = strstr(optstr, ",ipv6");
 686     if (begin) {
 687         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 688             return -1;
 689         }
 690         addr->has_ipv6 = true;
 691     }
 692     begin = strstr(optstr, ",keep-alive");
 693     if (begin) {
 694         if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"),
 695                             &addr->keep_alive, errp) < 0)
 696         {
 697             return -1;
 698         }
 699         addr->has_keep_alive = true;
 700     }
 701 #ifdef HAVE_IPPROTO_MPTCP
 702     begin = strstr(optstr, ",mptcp");
 703     if (begin) {
 704         if (inet_parse_flag("mptcp", begin + strlen(",mptcp"),
 705                             &addr->mptcp, errp) < 0)
 706         {
 707             return -1;
 708         }
 709         addr->has_mptcp = true;
 710     }
 711 #endif
 712     return 0;
 713 }
 714
 715
 716 /**
 717  * Create a blocking socket and connect it to an address.
 718  *
 719  * @str: address string
 720  * @errp: set in case of an error
 721  *
 722  * Returns -1 in case of error, file descriptor on success
 723  **/
 724 int inet_connect(const char *str, Error **errp)
 725 {
 726     int sock = -1;
 727     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 728
 729     if (!inet_parse(addr, str, errp)) {
 730         sock = inet_connect_saddr(addr, errp);
 731     }
 732     qapi_free_InetSocketAddress(addr);
 733     return sock;
 734 }
 735
 736 #ifdef CONFIG_AF_VSOCK
 737 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 738                                           struct sockaddr_vm *svm,
 739                                           Error **errp)
 740 {
 741     unsigned long long val;
 742
 743     memset(svm, 0, sizeof(*svm));
 744     svm->svm_family = AF_VSOCK;
 745
 746     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 747         val > UINT32_MAX) {
 748         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 749         return false;
 750     }
 751     svm->svm_cid = val;
 752
 753     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 754         val > UINT32_MAX) {
 755         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 756         return false;
 757     }
 758     svm->svm_port = val;
 759
 760     return true;
 761 }
 762
 763 static int vsock_connect_addr(const VsockSocketAddress *vaddr,
 764                               const struct sockaddr_vm *svm, Error **errp)
 765 {
 766     int sock, rc;
 767
 768     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 769     if (sock < 0) {
 770         error_setg_errno(errp, errno, "Failed to create socket family %d",
 771                          AF_VSOCK);
 772         return -1;
 773     }
 774
 775     /* connect to peer */
 776     do {
 777         rc = 0;
 778         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 779             rc = -errno;
 780         }
 781     } while (rc == -EINTR);
 782
 783     if (rc < 0) {
 784         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 785                          vaddr->cid, vaddr->port);
 786         closesocket(sock);
 787         return -1;
 788     }
 789
 790     return sock;
 791 }
 792
 793 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 794 {
 795     struct sockaddr_vm svm;
 796
 797     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 798         return -1;
 799     }
 800
 801     return vsock_connect_addr(vaddr, &svm, errp);
 802 }
 803
 804 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 805                               int num,
 806                               Error **errp)
 807 {
 808     struct sockaddr_vm svm;
 809     int slisten;
 810
 811     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 812         return -1;
 813     }
 814
 815     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 816     if (slisten < 0) {
 817         error_setg_errno(errp, errno, "Failed to create socket");
 818         return -1;
 819     }
 820
 821     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 822         error_setg_errno(errp, errno, "Failed to bind socket");
 823         closesocket(slisten);
 824         return -1;
 825     }
 826
 827     if (listen(slisten, num) != 0) {
 828         error_setg_errno(errp, errno, "Failed to listen on socket");
 829         closesocket(slisten);
 830         return -1;
 831     }
 832     return slisten;
 833 }
 834
 835 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 836                        Error **errp)
 837 {
 838     char cid[33];
 839     char port[33];
 840     int n;
 841
 842     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 843         error_setg(errp, "error parsing address '%s'", str);
 844         return -1;
 845     }
 846     if (str[n] != '\0') {
 847         error_setg(errp, "trailing characters in address '%s'", str);
 848         return -1;
 849     }
 850
 851     addr->cid = g_strdup(cid);
 852     addr->port = g_strdup(port);
 853     return 0;
 854 }
 855 #else
 856 static void vsock_unsupported(Error **errp)
 857 {
 858     error_setg(errp, "socket family AF_VSOCK unsupported");
 859 }
 860
 861 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 862 {
 863     vsock_unsupported(errp);
 864     return -1;
 865 }
 866
 867 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 868                               int num,
 869                               Error **errp)
 870 {
 871     vsock_unsupported(errp);
 872     return -1;
 873 }
 874
 875 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 876                         Error **errp)
 877 {
 878     vsock_unsupported(errp);
 879     return -1;
 880 }
 881 #endif /* CONFIG_AF_VSOCK */
 882
 883 #ifndef _WIN32
 884
 885 static bool saddr_is_abstract(UnixSocketAddress *saddr)
 886 {
 887 #ifdef CONFIG_LINUX
 888     return saddr->abstract;
 889 #else
 890     return false;
 891 #endif
 892 }
 893
 894 static bool saddr_is_tight(UnixSocketAddress *saddr)
 895 {
 896 #ifdef CONFIG_LINUX
 897     return !saddr->has_tight || saddr->tight;
 898 #else
 899     return false;
 900 #endif
 901 }
 902
 903 static int unix_listen_saddr(UnixSocketAddress *saddr,
 904                              int num,
 905                              Error **errp)
 906 {
 907     bool abstract = saddr_is_abstract(saddr);
 908     struct sockaddr_un un;
 909     int sock, fd;
 910     char *pathbuf = NULL;
 911     const char *path;
 912     size_t pathlen;
 913     size_t addrlen;
 914
 915     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 916     if (sock < 0) {
 917         error_setg_errno(errp, errno, "Failed to create Unix socket");
 918         return -1;
 919     }
 920
 921     if (saddr->path[0] || abstract) {
 922         path = saddr->path;
 923     } else {
 924         const char *tmpdir = getenv("TMPDIR");
 925         tmpdir = tmpdir ? tmpdir : "/tmp";
 926         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 927     }
 928
 929     pathlen = strlen(path);
 930     if (pathlen > sizeof(un.sun_path) ||
 931         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
 932         error_setg(errp, "UNIX socket path '%s' is too long", path);
 933         error_append_hint(errp, "Path must be less than %zu bytes\n",
 934                           abstract ? sizeof(un.sun_path) - 1 :
 935                           sizeof(un.sun_path));
 936         goto err;
 937     }
 938
 939     if (pathbuf != NULL) {
 940         /*
 941          * This dummy fd usage silences the mktemp() unsecure warning.
 942          * Using mkstemp() doesn't make things more secure here
 943          * though.  bind() complains about existing files, so we have
 944          * to unlink first and thus re-open the race window.  The
 945          * worst case possible is bind() failing, i.e. a DoS attack.
 946          */
 947         fd = mkstemp(pathbuf);
 948         if (fd < 0) {
 949             error_setg_errno(errp, errno,
 950                              "Failed to make a temporary socket %s", pathbuf);
 951             goto err;
 952         }
 953         close(fd);
 954     }
 955
 956     if (!abstract && unlink(path) < 0 && errno != ENOENT) {
 957         error_setg_errno(errp, errno,
 958                          "Failed to unlink socket %s", path);
 959         goto err;
 960     }
 961
 962     memset(&un, 0, sizeof(un));
 963     un.sun_family = AF_UNIX;
 964     addrlen = sizeof(un);
 965
 966     if (abstract) {
 967         un.sun_path[0] = '\0';
 968         memcpy(&un.sun_path[1], path, pathlen);
 969         if (saddr_is_tight(saddr)) {
 970             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
 971         }
 972     } else {
 973         memcpy(un.sun_path, path, pathlen);
 974     }
 975
 976     if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) {
 977         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 978         goto err;
 979     }
 980     if (listen(sock, num) < 0) {
 981         error_setg_errno(errp, errno, "Failed to listen on socket");
 982         goto err;
 983     }
 984
 985     g_free(pathbuf);
 986     return sock;
 987
 988 err:
 989     g_free(pathbuf);
 990     closesocket(sock);
 991     return -1;
 992 }
 993
 994 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 995 {
 996     bool abstract = saddr_is_abstract(saddr);
 997     struct sockaddr_un un;
 998     int sock, rc;
 999     size_t pathlen;
1000     size_t addrlen;
1001
1002     if (saddr->path == NULL) {
1003         error_setg(errp, "unix connect: no path specified");
1004         return -1;
1005     }
1006
1007     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
1008     if (sock < 0) {
1009         error_setg_errno(errp, errno, "Failed to create socket");
1010         return -1;
1011     }
1012
1013     pathlen = strlen(saddr->path);
1014     if (pathlen > sizeof(un.sun_path) ||
1015         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
1016         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
1017         error_append_hint(errp, "Path must be less than %zu bytes\n",
1018                           abstract ? sizeof(un.sun_path) - 1 :
1019                           sizeof(un.sun_path));
1020         goto err;
1021     }
1022
1023     memset(&un, 0, sizeof(un));
1024     un.sun_family = AF_UNIX;
1025     addrlen = sizeof(un);
1026
1027     if (abstract) {
1028         un.sun_path[0] = '\0';
1029         memcpy(&un.sun_path[1], saddr->path, pathlen);
1030         if (saddr_is_tight(saddr)) {
1031             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
1032         }
1033     } else {
1034         memcpy(un.sun_path, saddr->path, pathlen);
1035     }
1036     /* connect to peer */
1037     do {
1038         rc = 0;
1039         if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) {
1040             rc = -errno;
1041         }
1042     } while (rc == -EINTR);
1043
1044     if (rc < 0) {
1045         error_setg_errno(errp, -rc, "Failed to connect to '%s'",
1046                          saddr->path);
1047         goto err;
1048     }
1049
1050     return sock;
1051
1052  err:
1053     close(sock);
1054     return -1;
1055 }
1056
1057 #else
1058
1059 static int unix_listen_saddr(UnixSocketAddress *saddr,
1060                              int num,
1061                              Error **errp)
1062 {
1063     error_setg(errp, "unix sockets are not available on windows");
1064     errno = ENOTSUP;
1065     return -1;
1066 }
1067
1068 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
1069 {
1070     error_setg(errp, "unix sockets are not available on windows");
1071     errno = ENOTSUP;
1072     return -1;
1073 }
1074 #endif
1075
1076 /* compatibility wrapper */
1077 int unix_listen(const char *str, Error **errp)
1078 {
1079     UnixSocketAddress *saddr;
1080     int sock;
1081
1082     saddr = g_new0(UnixSocketAddress, 1);
1083     saddr->path = g_strdup(str);
1084     sock = unix_listen_saddr(saddr, 1, errp);
1085     qapi_free_UnixSocketAddress(saddr);
1086     return sock;
1087 }
1088
1089 int unix_connect(const char *path, Error **errp)
1090 {
1091     UnixSocketAddress *saddr;
1092     int sock;
1093
1094     saddr = g_new0(UnixSocketAddress, 1);
1095     saddr->path = g_strdup(path);
1096     sock = unix_connect_saddr(saddr, errp);
1097     qapi_free_UnixSocketAddress(saddr);
1098     return sock;
1099 }
1100
1101
1102 SocketAddress *socket_parse(const char *str, Error **errp)
1103 {
1104     SocketAddress *addr;
1105
1106     addr = g_new0(SocketAddress, 1);
1107     if (strstart(str, "unix:", NULL)) {
1108         if (str[5] == '\0') {
1109             error_setg(errp, "invalid Unix socket address");
1110             goto fail;
1111         } else {
1112             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1113             addr->u.q_unix.path = g_strdup(str + 5);
1114         }
1115     } else if (strstart(str, "fd:", NULL)) {
1116         if (str[3] == '\0') {
1117             error_setg(errp, "invalid file descriptor address");
1118             goto fail;
1119         } else {
1120             addr->type = SOCKET_ADDRESS_TYPE_FD;
1121             addr->u.fd.str = g_strdup(str + 3);
1122         }
1123     } else if (strstart(str, "vsock:", NULL)) {
1124         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1125         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1126             goto fail;
1127         }
1128     } else {
1129         addr->type = SOCKET_ADDRESS_TYPE_INET;
1130         if (inet_parse(&addr->u.inet, str, errp)) {
1131             goto fail;
1132         }
1133     }
1134     return addr;
1135
1136 fail:
1137     qapi_free_SocketAddress(addr);
1138     return NULL;
1139 }
1140
1141 static int socket_get_fd(const char *fdstr, Error **errp)
1142 {
1143     Monitor *cur_mon = monitor_cur();
1144     int fd;
1145     if (cur_mon) {
1146         fd = monitor_get_fd(cur_mon, fdstr, errp);
1147         if (fd < 0) {
1148             return -1;
1149         }
1150     } else {
1151         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1152             error_setg_errno(errp, errno,
1153                              "Unable to parse FD number %s",
1154                              fdstr);
1155             return -1;
1156         }
1157     }
1158     if (!fd_is_socket(fd)) {
1159         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1160         close(fd);
1161         return -1;
1162     }
1163     return fd;
1164 }
1165
1166 int socket_address_parse_named_fd(SocketAddress *addr, Error **errp)
1167 {
1168     int fd;
1169
1170     if (addr->type != SOCKET_ADDRESS_TYPE_FD) {
1171         return 0;
1172     }
1173
1174     fd = socket_get_fd(addr->u.fd.str, errp);
1175     if (fd < 0) {
1176         return fd;
1177     }
1178
1179     g_free(addr->u.fd.str);
1180     addr->u.fd.str = g_strdup_printf("%d", fd);
1181
1182     return 0;
1183 }
1184
1185 int socket_connect(SocketAddress *addr, Error **errp)
1186 {
1187     int fd;
1188
1189     switch (addr->type) {
1190     case SOCKET_ADDRESS_TYPE_INET:
1191         fd = inet_connect_saddr(&addr->u.inet, errp);
1192         break;
1193
1194     case SOCKET_ADDRESS_TYPE_UNIX:
1195         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1196         break;
1197
1198     case SOCKET_ADDRESS_TYPE_FD:
1199         fd = socket_get_fd(addr->u.fd.str, errp);
1200         break;
1201
1202     case SOCKET_ADDRESS_TYPE_VSOCK:
1203         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1204         break;
1205
1206     default:
1207         abort();
1208     }
1209     return fd;
1210 }
1211
1212 int socket_listen(SocketAddress *addr, int num, Error **errp)
1213 {
1214     int fd;
1215
1216     trace_socket_listen(num);
1217     switch (addr->type) {
1218     case SOCKET_ADDRESS_TYPE_INET:
1219         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1220         break;
1221
1222     case SOCKET_ADDRESS_TYPE_UNIX:
1223         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1224         break;
1225
1226     case SOCKET_ADDRESS_TYPE_FD:
1227         fd = socket_get_fd(addr->u.fd.str, errp);
1228         if (fd < 0) {
1229             return -1;
1230         }
1231
1232         /*
1233          * If the socket is not yet in the listen state, then transition it to
1234          * the listen state now.
1235          *
1236          * If it's already listening then this updates the backlog value as
1237          * requested.
1238          *
1239          * If this socket cannot listen because it's already in another state
1240          * (e.g. unbound or connected) then we'll catch the error here.
1241          */
1242         if (listen(fd, num) != 0) {
1243             error_setg_errno(errp, errno, "Failed to listen on fd socket");
1244             closesocket(fd);
1245             return -1;
1246         }
1247         break;
1248
1249     case SOCKET_ADDRESS_TYPE_VSOCK:
1250         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1251         break;
1252
1253     default:
1254         abort();
1255     }
1256     return fd;
1257 }
1258
1259 void socket_listen_cleanup(int fd, Error **errp)
1260 {
1261     SocketAddress *addr;
1262
1263     addr = socket_local_address(fd, errp);
1264     if (!addr) {
1265         return;
1266     }
1267
1268     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1269         && addr->u.q_unix.path) {
1270         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1271             error_setg_errno(errp, errno,
1272                              "Failed to unlink socket %s",
1273                              addr->u.q_unix.path);
1274         }
1275     }
1276
1277     qapi_free_SocketAddress(addr);
1278 }
1279
1280 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1281 {
1282     int fd;
1283
1284     /*
1285      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1286      * (although other address families can do SOCK_DGRAM, too)
1287      */
1288     switch (remote->type) {
1289     case SOCKET_ADDRESS_TYPE_INET:
1290         fd = inet_dgram_saddr(&remote->u.inet,
1291                               local ? &local->u.inet : NULL, errp);
1292         break;
1293
1294     default:
1295         error_setg(errp, "socket type unsupported for datagram");
1296         fd = -1;
1297     }
1298     return fd;
1299 }
1300
1301
1302 static SocketAddress *
1303 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1304                                 socklen_t salen,
1305                                 Error **errp)
1306 {
1307     char host[NI_MAXHOST];
1308     char serv[NI_MAXSERV];
1309     SocketAddress *addr;
1310     InetSocketAddress *inet;
1311     int ret;
1312
1313     ret = getnameinfo((struct sockaddr *)sa, salen,
1314                       host, sizeof(host),
1315                       serv, sizeof(serv),
1316                       NI_NUMERICHOST | NI_NUMERICSERV);
1317     if (ret != 0) {
1318         error_setg(errp, "Cannot format numeric socket address: %s",
1319                    gai_strerror(ret));
1320         return NULL;
1321     }
1322
1323     addr = g_new0(SocketAddress, 1);
1324     addr->type = SOCKET_ADDRESS_TYPE_INET;
1325     inet = &addr->u.inet;
1326     inet->host = g_strdup(host);
1327     inet->port = g_strdup(serv);
1328     if (sa->ss_family == AF_INET) {
1329         inet->has_ipv4 = inet->ipv4 = true;
1330     } else {
1331         inet->has_ipv6 = inet->ipv6 = true;
1332     }
1333
1334     return addr;
1335 }
1336
1337
1338 #ifndef WIN32
1339 static SocketAddress *
1340 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1341                                 socklen_t salen,
1342                                 Error **errp)
1343 {
1344     SocketAddress *addr;
1345     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1346
1347     addr = g_new0(SocketAddress, 1);
1348     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1349     salen -= offsetof(struct sockaddr_un, sun_path);
1350 #ifdef CONFIG_LINUX
1351     if (salen > 0 && !su->sun_path[0]) {
1352         /* Linux abstract socket */
1353         addr->u.q_unix.path = g_strndup(su->sun_path + 1, salen - 1);
1354         addr->u.q_unix.has_abstract = true;
1355         addr->u.q_unix.abstract = true;
1356         addr->u.q_unix.has_tight = true;
1357         addr->u.q_unix.tight = salen < sizeof(su->sun_path);
1358         return addr;
1359     }
1360 #endif
1361
1362     addr->u.q_unix.path = g_strndup(su->sun_path, salen);
1363     return addr;
1364 }
1365 #endif /* WIN32 */
1366
1367 #ifdef CONFIG_AF_VSOCK
1368 static SocketAddress *
1369 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1370                                  socklen_t salen,
1371                                  Error **errp)
1372 {
1373     SocketAddress *addr;
1374     VsockSocketAddress *vaddr;
1375     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1376
1377     addr = g_new0(SocketAddress, 1);
1378     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1379     vaddr = &addr->u.vsock;
1380     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1381     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1382
1383     return addr;
1384 }
1385 #endif /* CONFIG_AF_VSOCK */
1386
1387 SocketAddress *
1388 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1389                            socklen_t salen,
1390                            Error **errp)
1391 {
1392     switch (sa->ss_family) {
1393     case AF_INET:
1394     case AF_INET6:
1395         return socket_sockaddr_to_address_inet(sa, salen, errp);
1396
1397 #ifndef WIN32
1398     case AF_UNIX:
1399         return socket_sockaddr_to_address_unix(sa, salen, errp);
1400 #endif /* WIN32 */
1401
1402 #ifdef CONFIG_AF_VSOCK
1403     case AF_VSOCK:
1404         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1405 #endif
1406
1407     default:
1408         error_setg(errp, "socket family %d unsupported",
1409                    sa->ss_family);
1410         return NULL;
1411     }
1412     return 0;
1413 }
1414
1415
1416 SocketAddress *socket_local_address(int fd, Error **errp)
1417 {
1418     struct sockaddr_storage ss;
1419     socklen_t sslen = sizeof(ss);
1420
1421     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1422         error_setg_errno(errp, errno, "%s",
1423                          "Unable to query local socket address");
1424         return NULL;
1425     }
1426
1427     return socket_sockaddr_to_address(&ss, sslen, errp);
1428 }
1429
1430
1431 SocketAddress *socket_remote_address(int fd, Error **errp)
1432 {
1433     struct sockaddr_storage ss;
1434     socklen_t sslen = sizeof(ss);
1435
1436     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1437         error_setg_errno(errp, errno, "%s",
1438                          "Unable to query remote socket address");
1439         return NULL;
1440     }
1441
1442     return socket_sockaddr_to_address(&ss, sslen, errp);
1443 }
1444
1445
1446 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1447 {
1448     SocketAddress *addr;
1449
1450     if (!addr_legacy) {
1451         return NULL;
1452     }
1453
1454     addr = g_new(SocketAddress, 1);
1455
1456     switch (addr_legacy->type) {
1457     case SOCKET_ADDRESS_TYPE_INET:
1458         addr->type = SOCKET_ADDRESS_TYPE_INET;
1459         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1460                            addr_legacy->u.inet.data);
1461         break;
1462     case SOCKET_ADDRESS_TYPE_UNIX:
1463         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1464         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1465                            addr_legacy->u.q_unix.data);
1466         break;
1467     case SOCKET_ADDRESS_TYPE_VSOCK:
1468         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1469         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1470                            addr_legacy->u.vsock.data);
1471         break;
1472     case SOCKET_ADDRESS_TYPE_FD:
1473         addr->type = SOCKET_ADDRESS_TYPE_FD;
1474         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1475         break;
1476     default:
1477         abort();
1478     }
1479
1480     return addr;
1481 }