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     ERRP_GUARD();
 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
 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_socktype = SOCK_STREAM;
 235     ai.ai_family = inet_ai_family_from_address(saddr, errp);
 236     if (*errp) {
 237         return -1;
 238     }
 239
 240     if (saddr->host == NULL) {
 241         error_setg(errp, "host not specified");
 242         return -1;
 243     }
 244     if (saddr->port != NULL) {
 245         pstrcpy(port, sizeof(port), saddr->port);
 246     } else {
 247         port[0] = '\0';
 248     }
 249
 250     /* lookup */
 251     if (port_offset) {
 252         uint64_t baseport;
 253         if (strlen(port) == 0) {
 254             error_setg(errp, "port not specified");
 255             return -1;
 256         }
 257         if (parse_uint_full(port, 10, &baseport) < 0) {
 258             error_setg(errp, "can't convert to a number: %s", port);
 259             return -1;
 260         }
 261         if (baseport > 65535 ||
 262             baseport + port_offset > 65535) {
 263             error_setg(errp, "port %s out of range", port);
 264             return -1;
 265         }
 266         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 267     }
 268     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 269                      strlen(port) ? port : NULL, &ai, &res);
 270     if (rc != 0) {
 271         error_setg(errp, "address resolution failed for %s:%s: %s",
 272                    saddr->host, port, gai_strerror(rc));
 273         return -1;
 274     }
 275
 276     /* create socket + bind/listen */
 277     for (e = res; e != NULL; e = e->ai_next) {
 278 #ifdef HAVE_IPPROTO_MPTCP
 279         if (saddr->has_mptcp && saddr->mptcp) {
 280             e->ai_protocol = IPPROTO_MPTCP;
 281         }
 282 #endif
 283         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 284                         uaddr,INET6_ADDRSTRLEN,uport,32,
 285                         NI_NUMERICHOST | NI_NUMERICSERV);
 286
 287         port_min = inet_getport(e);
 288         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 289         for (p = port_min; p <= port_max; p++) {
 290             inet_setport(e, p);
 291
 292             slisten = create_fast_reuse_socket(e);
 293             if (slisten < 0) {
 294                 /* First time we expect we might fail to create the socket
 295                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 296                  * Later iterations should always succeed if first iteration
 297                  * worked though, so treat that as fatal.
 298                  */
 299                 if (p == port_min) {
 300                     continue;
 301                 } else {
 302                     error_setg_errno(errp, errno,
 303                                      "Failed to recreate failed listening socket");
 304                     goto listen_failed;
 305                 }
 306             }
 307             socket_created = true;
 308
 309             rc = try_bind(slisten, saddr, e);
 310             if (rc < 0) {
 311                 if (errno != EADDRINUSE) {
 312                     error_setg_errno(errp, errno, "Failed to bind socket");
 313                     goto listen_failed;
 314                 }
 315             } else {
 316                 if (!listen(slisten, num)) {
 317                     goto listen_ok;
 318                 }
 319                 if (errno != EADDRINUSE) {
 320                     error_setg_errno(errp, errno, "Failed to listen on socket");
 321                     goto listen_failed;
 322                 }
 323             }
 324             /* Someone else managed to bind to the same port and beat us
 325              * to listen on it! Socket semantics does not allow us to
 326              * recover from this situation, so we need to recreate the
 327              * socket to allow bind attempts for subsequent ports:
 328              */
 329             close(slisten);
 330             slisten = -1;
 331         }
 332     }
 333     error_setg_errno(errp, errno,
 334                      socket_created ?
 335                      "Failed to find an available port" :
 336                      "Failed to create a socket");
 337 listen_failed:
 338     saved_errno = errno;
 339     if (slisten >= 0) {
 340         close(slisten);
 341     }
 342     freeaddrinfo(res);
 343     errno = saved_errno;
 344     return -1;
 345
 346 listen_ok:
 347     freeaddrinfo(res);
 348     return slisten;
 349 }
 350
 351 #ifdef _WIN32
 352 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 353     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 354 #else
 355 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 356     ((rc) == -EINPROGRESS)
 357 #endif
 358
 359 static int inet_connect_addr(const InetSocketAddress *saddr,
 360                              struct addrinfo *addr, Error **errp)
 361 {
 362     int sock, rc;
 363
 364     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 365     if (sock < 0) {
 366         error_setg_errno(errp, errno, "Failed to create socket family %d",
 367                          addr->ai_family);
 368         return -1;
 369     }
 370     socket_set_fast_reuse(sock);
 371
 372     /* connect to peer */
 373     do {
 374         rc = 0;
 375         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 376             rc = -errno;
 377         }
 378     } while (rc == -EINTR);
 379
 380     if (rc < 0) {
 381         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 382                          saddr->host, saddr->port);
 383         close(sock);
 384         return -1;
 385     }
 386
 387     return sock;
 388 }
 389
 390 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 391                                                  Error **errp)
 392 {
 393     ERRP_GUARD();
 394     struct addrinfo ai, *res;
 395     int rc;
 396     static int useV4Mapped = 1;
 397
 398     memset(&ai, 0, sizeof(ai));
 399
 400     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 401     if (qatomic_read(&useV4Mapped)) {
 402         ai.ai_flags |= AI_V4MAPPED;
 403     }
 404     ai.ai_socktype = SOCK_STREAM;
 405     ai.ai_family = inet_ai_family_from_address(saddr, errp);
 406     if (*errp) {
 407         return NULL;
 408     }
 409
 410     if (saddr->host == NULL || saddr->port == NULL) {
 411         error_setg(errp, "host and/or port not specified");
 412         return NULL;
 413     }
 414
 415     /* lookup */
 416     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 417
 418     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 419      * then don't implement it in their getaddrinfo(). Detect
 420      * this and retry without the flag since that's preferable
 421      * to a fatal error
 422      */
 423     if (rc == EAI_BADFLAGS &&
 424         (ai.ai_flags & AI_V4MAPPED)) {
 425         qatomic_set(&useV4Mapped, 0);
 426         ai.ai_flags &= ~AI_V4MAPPED;
 427         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 428     }
 429     if (rc != 0) {
 430         error_setg(errp, "address resolution failed for %s:%s: %s",
 431                    saddr->host, saddr->port, gai_strerror(rc));
 432         return NULL;
 433     }
 434     return res;
 435 }
 436
 437 /**
 438  * Create a socket and connect it to an address.
 439  *
 440  * @saddr: Inet socket address specification
 441  * @errp: set on error
 442  *
 443  * Returns: -1 on error, file descriptor on success.
 444  */
 445 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 446 {
 447     Error *local_err = NULL;
 448     struct addrinfo *res, *e;
 449     int sock = -1;
 450
 451     res = inet_parse_connect_saddr(saddr, errp);
 452     if (!res) {
 453         return -1;
 454     }
 455
 456     for (e = res; e != NULL; e = e->ai_next) {
 457         error_free(local_err);
 458         local_err = NULL;
 459
 460 #ifdef HAVE_IPPROTO_MPTCP
 461         if (saddr->has_mptcp && saddr->mptcp) {
 462             e->ai_protocol = IPPROTO_MPTCP;
 463         }
 464 #endif
 465
 466         sock = inet_connect_addr(saddr, e, &local_err);
 467         if (sock >= 0) {
 468             break;
 469         }
 470     }
 471
 472     freeaddrinfo(res);
 473
 474     if (sock < 0) {
 475         error_propagate(errp, local_err);
 476         return sock;
 477     }
 478
 479     if (saddr->keep_alive) {
 480         int val = 1;
 481         int ret = setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 482                              &val, sizeof(val));
 483
 484         if (ret < 0) {
 485             error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
 486             close(sock);
 487             return -1;
 488         }
 489     }
 490
 491     return sock;
 492 }
 493
 494 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 495                             InetSocketAddress *sladdr,
 496                             Error **errp)
 497 {
 498     ERRP_GUARD();
 499     struct addrinfo ai, *peer = NULL, *local = NULL;
 500     const char *addr;
 501     const char *port;
 502     int sock = -1, rc;
 503
 504     /* lookup peer addr */
 505     memset(&ai,0, sizeof(ai));
 506     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 507     ai.ai_socktype = SOCK_DGRAM;
 508     ai.ai_family = inet_ai_family_from_address(sraddr, errp);
 509     if (*errp) {
 510         goto err;
 511     }
 512
 513     addr = sraddr->host;
 514     port = sraddr->port;
 515     if (addr == NULL || strlen(addr) == 0) {
 516         addr = "localhost";
 517     }
 518     if (port == NULL || strlen(port) == 0) {
 519         error_setg(errp, "remote port not specified");
 520         goto err;
 521     }
 522
 523     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 524         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 525                    gai_strerror(rc));
 526         goto err;
 527     }
 528
 529     /* lookup local addr */
 530     memset(&ai,0, sizeof(ai));
 531     ai.ai_flags = AI_PASSIVE;
 532     ai.ai_family = peer->ai_family;
 533     ai.ai_socktype = SOCK_DGRAM;
 534
 535     if (sladdr) {
 536         addr = sladdr->host;
 537         port = sladdr->port;
 538         if (addr == NULL || strlen(addr) == 0) {
 539             addr = NULL;
 540         }
 541         if (!port || strlen(port) == 0) {
 542             port = "0";
 543         }
 544     } else {
 545         addr = NULL;
 546         port = "0";
 547     }
 548
 549     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 550         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 551                    gai_strerror(rc));
 552         goto err;
 553     }
 554
 555     /* create socket */
 556     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 557     if (sock < 0) {
 558         error_setg_errno(errp, errno, "Failed to create socket family %d",
 559                          peer->ai_family);
 560         goto err;
 561     }
 562     socket_set_fast_reuse(sock);
 563
 564     /* bind socket */
 565     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 566         error_setg_errno(errp, errno, "Failed to bind socket");
 567         goto err;
 568     }
 569
 570     /* connect to peer */
 571     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 572         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 573                          addr, port);
 574         goto err;
 575     }
 576
 577     freeaddrinfo(local);
 578     freeaddrinfo(peer);
 579     return sock;
 580
 581 err:
 582     if (sock != -1) {
 583         close(sock);
 584     }
 585     if (local) {
 586         freeaddrinfo(local);
 587     }
 588     if (peer) {
 589         freeaddrinfo(peer);
 590     }
 591
 592     return -1;
 593 }
 594
 595 /* compatibility wrapper */
 596 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 597                            Error **errp)
 598 {
 599     char *end;
 600     size_t len;
 601
 602     end = strstr(optstr, ",");
 603     if (end) {
 604         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 605             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 606             return -1;
 607         }
 608         len = end - optstr;
 609     } else {
 610         len = strlen(optstr);
 611     }
 612     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 613         *val = true;
 614     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 615         *val = false;
 616     } else {
 617         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 618         return -1;
 619     }
 620     return 0;
 621 }
 622
 623 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 624 {
 625     const char *optstr, *h;
 626     char host[65];
 627     char port[33];
 628     int to;
 629     int pos;
 630     char *begin;
 631
 632     memset(addr, 0, sizeof(*addr));
 633
 634     /* parse address */
 635     if (str[0] == ':') {
 636         /* no host given */
 637         host[0] = '\0';
 638         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 639             error_setg(errp, "error parsing port in address '%s'", str);
 640             return -1;
 641         }
 642     } else if (str[0] == '[') {
 643         /* IPv6 addr */
 644         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 645             error_setg(errp, "error parsing IPv6 address '%s'", str);
 646             return -1;
 647         }
 648     } else {
 649         /* hostname or IPv4 addr */
 650         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 651             error_setg(errp, "error parsing address '%s'", str);
 652             return -1;
 653         }
 654     }
 655
 656     addr->host = g_strdup(host);
 657     addr->port = g_strdup(port);
 658
 659     /* parse options */
 660     optstr = str + pos;
 661     h = strstr(optstr, ",to=");
 662     if (h) {
 663         h += 4;
 664         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 665             (h[pos] != '\0' && h[pos] != ',')) {
 666             error_setg(errp, "error parsing to= argument");
 667             return -1;
 668         }
 669         addr->has_to = true;
 670         addr->to = to;
 671     }
 672     begin = strstr(optstr, ",ipv4");
 673     if (begin) {
 674         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 675             return -1;
 676         }
 677         addr->has_ipv4 = true;
 678     }
 679     begin = strstr(optstr, ",ipv6");
 680     if (begin) {
 681         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 682             return -1;
 683         }
 684         addr->has_ipv6 = true;
 685     }
 686     begin = strstr(optstr, ",keep-alive");
 687     if (begin) {
 688         if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"),
 689                             &addr->keep_alive, errp) < 0)
 690         {
 691             return -1;
 692         }
 693         addr->has_keep_alive = true;
 694     }
 695 #ifdef HAVE_IPPROTO_MPTCP
 696     begin = strstr(optstr, ",mptcp");
 697     if (begin) {
 698         if (inet_parse_flag("mptcp", begin + strlen(",mptcp"),
 699                             &addr->mptcp, errp) < 0)
 700         {
 701             return -1;
 702         }
 703         addr->has_mptcp = true;
 704     }
 705 #endif
 706     return 0;
 707 }
 708
 709
 710 /**
 711  * Create a blocking socket and connect it to an address.
 712  *
 713  * @str: address string
 714  * @errp: set in case of an error
 715  *
 716  * Returns -1 in case of error, file descriptor on success
 717  **/
 718 int inet_connect(const char *str, Error **errp)
 719 {
 720     int sock = -1;
 721     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 722
 723     if (!inet_parse(addr, str, errp)) {
 724         sock = inet_connect_saddr(addr, errp);
 725     }
 726     qapi_free_InetSocketAddress(addr);
 727     return sock;
 728 }
 729
 730 #ifdef CONFIG_AF_VSOCK
 731 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 732                                           struct sockaddr_vm *svm,
 733                                           Error **errp)
 734 {
 735     uint64_t val;
 736
 737     memset(svm, 0, sizeof(*svm));
 738     svm->svm_family = AF_VSOCK;
 739
 740     if (parse_uint_full(vaddr->cid, 10, &val) < 0 ||
 741         val > UINT32_MAX) {
 742         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 743         return false;
 744     }
 745     svm->svm_cid = val;
 746
 747     if (parse_uint_full(vaddr->port, 10, &val) < 0 ||
 748         val > UINT32_MAX) {
 749         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 750         return false;
 751     }
 752     svm->svm_port = val;
 753
 754     return true;
 755 }
 756
 757 static int vsock_connect_addr(const VsockSocketAddress *vaddr,
 758                               const struct sockaddr_vm *svm, Error **errp)
 759 {
 760     int sock, rc;
 761
 762     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 763     if (sock < 0) {
 764         error_setg_errno(errp, errno, "Failed to create socket family %d",
 765                          AF_VSOCK);
 766         return -1;
 767     }
 768
 769     /* connect to peer */
 770     do {
 771         rc = 0;
 772         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 773             rc = -errno;
 774         }
 775     } while (rc == -EINTR);
 776
 777     if (rc < 0) {
 778         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 779                          vaddr->cid, vaddr->port);
 780         close(sock);
 781         return -1;
 782     }
 783
 784     return sock;
 785 }
 786
 787 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 788 {
 789     struct sockaddr_vm svm;
 790
 791     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 792         return -1;
 793     }
 794
 795     return vsock_connect_addr(vaddr, &svm, errp);
 796 }
 797
 798 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 799                               int num,
 800                               Error **errp)
 801 {
 802     struct sockaddr_vm svm;
 803     int slisten;
 804
 805     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 806         return -1;
 807     }
 808
 809     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 810     if (slisten < 0) {
 811         error_setg_errno(errp, errno, "Failed to create socket");
 812         return -1;
 813     }
 814
 815     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 816         error_setg_errno(errp, errno, "Failed to bind socket");
 817         close(slisten);
 818         return -1;
 819     }
 820
 821     if (listen(slisten, num) != 0) {
 822         error_setg_errno(errp, errno, "Failed to listen on socket");
 823         close(slisten);
 824         return -1;
 825     }
 826     return slisten;
 827 }
 828
 829 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 830                        Error **errp)
 831 {
 832     char cid[33];
 833     char port[33];
 834     int n;
 835
 836     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 837         error_setg(errp, "error parsing address '%s'", str);
 838         return -1;
 839     }
 840     if (str[n] != '\0') {
 841         error_setg(errp, "trailing characters in address '%s'", str);
 842         return -1;
 843     }
 844
 845     addr->cid = g_strdup(cid);
 846     addr->port = g_strdup(port);
 847     return 0;
 848 }
 849 #else
 850 static void vsock_unsupported(Error **errp)
 851 {
 852     error_setg(errp, "socket family AF_VSOCK unsupported");
 853 }
 854
 855 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 856 {
 857     vsock_unsupported(errp);
 858     return -1;
 859 }
 860
 861 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 862                               int num,
 863                               Error **errp)
 864 {
 865     vsock_unsupported(errp);
 866     return -1;
 867 }
 868
 869 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 870                         Error **errp)
 871 {
 872     vsock_unsupported(errp);
 873     return -1;
 874 }
 875 #endif /* CONFIG_AF_VSOCK */
 876
 877 static bool saddr_is_abstract(UnixSocketAddress *saddr)
 878 {
 879 #ifdef CONFIG_LINUX
 880     return saddr->abstract;
 881 #else
 882     return false;
 883 #endif
 884 }
 885
 886 static bool saddr_is_tight(UnixSocketAddress *saddr)
 887 {
 888 #ifdef CONFIG_LINUX
 889     return !saddr->has_tight || saddr->tight;
 890 #else
 891     return false;
 892 #endif
 893 }
 894
 895 static int unix_listen_saddr(UnixSocketAddress *saddr,
 896                              int num,
 897                              Error **errp)
 898 {
 899     bool abstract = saddr_is_abstract(saddr);
 900     struct sockaddr_un un;
 901     int sock, fd;
 902     char *pathbuf = NULL;
 903     const char *path;
 904     size_t pathlen;
 905     size_t addrlen;
 906
 907     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 908     if (sock < 0) {
 909         error_setg_errno(errp, errno, "Failed to create Unix socket");
 910         return -1;
 911     }
 912
 913     if (saddr->path[0] || abstract) {
 914         path = saddr->path;
 915     } else {
 916         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX",
 917                                          g_get_tmp_dir());
 918     }
 919
 920     pathlen = strlen(path);
 921     if (pathlen > sizeof(un.sun_path) ||
 922         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
 923         error_setg(errp, "UNIX socket path '%s' is too long", path);
 924         error_append_hint(errp, "Path must be less than %zu bytes\n",
 925                           abstract ? sizeof(un.sun_path) - 1 :
 926                           sizeof(un.sun_path));
 927         goto err;
 928     }
 929
 930     if (pathbuf != NULL) {
 931         /*
 932          * This dummy fd usage silences the mktemp() unsecure warning.
 933          * Using mkstemp() doesn't make things more secure here
 934          * though.  bind() complains about existing files, so we have
 935          * to unlink first and thus re-open the race window.  The
 936          * worst case possible is bind() failing, i.e. a DoS attack.
 937          */
 938         fd = mkstemp(pathbuf);
 939         if (fd < 0) {
 940             error_setg_errno(errp, errno,
 941                              "Failed to make a temporary socket %s", pathbuf);
 942             goto err;
 943         }
 944         close(fd);
 945     }
 946
 947     if (!abstract && unlink(path) < 0 && errno != ENOENT) {
 948         error_setg_errno(errp, errno,
 949                          "Failed to unlink socket %s", path);
 950         goto err;
 951     }
 952
 953     memset(&un, 0, sizeof(un));
 954     un.sun_family = AF_UNIX;
 955     addrlen = sizeof(un);
 956
 957     if (abstract) {
 958         un.sun_path[0] = '\0';
 959         memcpy(&un.sun_path[1], path, pathlen);
 960         if (saddr_is_tight(saddr)) {
 961             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
 962         }
 963     } else {
 964         memcpy(un.sun_path, path, pathlen);
 965     }
 966
 967     if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) {
 968         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 969         goto err;
 970     }
 971     if (listen(sock, num) < 0) {
 972         error_setg_errno(errp, errno, "Failed to listen on socket");
 973         goto err;
 974     }
 975
 976     g_free(pathbuf);
 977     return sock;
 978
 979 err:
 980     g_free(pathbuf);
 981     close(sock);
 982     return -1;
 983 }
 984
 985 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 986 {
 987     bool abstract = saddr_is_abstract(saddr);
 988     struct sockaddr_un un;
 989     int sock, rc;
 990     size_t pathlen;
 991     size_t addrlen;
 992
 993     if (saddr->path == NULL) {
 994         error_setg(errp, "unix connect: no path specified");
 995         return -1;
 996     }
 997
 998     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 999     if (sock < 0) {
1000         error_setg_errno(errp, errno, "Failed to create socket");
1001         return -1;
1002     }
1003
1004     pathlen = strlen(saddr->path);
1005     if (pathlen > sizeof(un.sun_path) ||
1006         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
1007         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
1008         error_append_hint(errp, "Path must be less than %zu bytes\n",
1009                           abstract ? sizeof(un.sun_path) - 1 :
1010                           sizeof(un.sun_path));
1011         goto err;
1012     }
1013
1014     memset(&un, 0, sizeof(un));
1015     un.sun_family = AF_UNIX;
1016     addrlen = sizeof(un);
1017
1018     if (abstract) {
1019         un.sun_path[0] = '\0';
1020         memcpy(&un.sun_path[1], saddr->path, pathlen);
1021         if (saddr_is_tight(saddr)) {
1022             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
1023         }
1024     } else {
1025         memcpy(un.sun_path, saddr->path, pathlen);
1026     }
1027     /* connect to peer */
1028     do {
1029         rc = 0;
1030         if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) {
1031             rc = -errno;
1032         }
1033     } while (rc == -EINTR);
1034
1035     if (rc < 0) {
1036         error_setg_errno(errp, -rc, "Failed to connect to '%s'",
1037                          saddr->path);
1038         goto err;
1039     }
1040
1041     return sock;
1042
1043  err:
1044     close(sock);
1045     return -1;
1046 }
1047
1048 /* compatibility wrapper */
1049 int unix_listen(const char *str, Error **errp)
1050 {
1051     UnixSocketAddress *saddr;
1052     int sock;
1053
1054     saddr = g_new0(UnixSocketAddress, 1);
1055     saddr->path = g_strdup(str);
1056     sock = unix_listen_saddr(saddr, 1, errp);
1057     qapi_free_UnixSocketAddress(saddr);
1058     return sock;
1059 }
1060
1061 int unix_connect(const char *path, Error **errp)
1062 {
1063     UnixSocketAddress *saddr;
1064     int sock;
1065
1066     saddr = g_new0(UnixSocketAddress, 1);
1067     saddr->path = g_strdup(path);
1068     sock = unix_connect_saddr(saddr, errp);
1069     qapi_free_UnixSocketAddress(saddr);
1070     return sock;
1071 }
1072
1073 char *socket_uri(SocketAddress *addr)
1074 {
1075     switch (addr->type) {
1076     case SOCKET_ADDRESS_TYPE_INET:
1077         return g_strdup_printf("tcp:%s:%s",
1078                                addr->u.inet.host,
1079                                addr->u.inet.port);
1080     case SOCKET_ADDRESS_TYPE_UNIX:
1081         return g_strdup_printf("unix:%s",
1082                                addr->u.q_unix.path);
1083     case SOCKET_ADDRESS_TYPE_FD:
1084         return g_strdup_printf("fd:%s", addr->u.fd.str);
1085     case SOCKET_ADDRESS_TYPE_VSOCK:
1086         return g_strdup_printf("vsock:%s:%s",
1087                                addr->u.vsock.cid,
1088                                addr->u.vsock.port);
1089     default:
1090         return g_strdup("unknown address type");
1091     }
1092 }
1093
1094 SocketAddress *socket_parse(const char *str, Error **errp)
1095 {
1096     SocketAddress *addr;
1097
1098     addr = g_new0(SocketAddress, 1);
1099     if (strstart(str, "unix:", NULL)) {
1100         if (str[5] == '\0') {
1101             error_setg(errp, "invalid Unix socket address");
1102             goto fail;
1103         } else {
1104             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1105             addr->u.q_unix.path = g_strdup(str + 5);
1106         }
1107     } else if (strstart(str, "fd:", NULL)) {
1108         if (str[3] == '\0') {
1109             error_setg(errp, "invalid file descriptor address");
1110             goto fail;
1111         } else {
1112             addr->type = SOCKET_ADDRESS_TYPE_FD;
1113             addr->u.fd.str = g_strdup(str + 3);
1114         }
1115     } else if (strstart(str, "vsock:", NULL)) {
1116         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1117         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1118             goto fail;
1119         }
1120     } else if (strstart(str, "tcp:", NULL)) {
1121         addr->type = SOCKET_ADDRESS_TYPE_INET;
1122         if (inet_parse(&addr->u.inet, str + strlen("tcp:"), errp)) {
1123             goto fail;
1124         }
1125     } else {
1126         addr->type = SOCKET_ADDRESS_TYPE_INET;
1127         if (inet_parse(&addr->u.inet, str, errp)) {
1128             goto fail;
1129         }
1130     }
1131     return addr;
1132
1133 fail:
1134     qapi_free_SocketAddress(addr);
1135     return NULL;
1136 }
1137
1138 static int socket_get_fd(const char *fdstr, Error **errp)
1139 {
1140     Monitor *cur_mon = monitor_cur();
1141     int fd;
1142     if (cur_mon) {
1143         fd = monitor_get_fd(cur_mon, fdstr, errp);
1144         if (fd < 0) {
1145             return -1;
1146         }
1147     } else {
1148         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1149             error_setg_errno(errp, errno,
1150                              "Unable to parse FD number %s",
1151                              fdstr);
1152             return -1;
1153         }
1154     }
1155     if (!fd_is_socket(fd)) {
1156         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1157         close(fd);
1158         return -1;
1159     }
1160     return fd;
1161 }
1162
1163 int socket_address_parse_named_fd(SocketAddress *addr, Error **errp)
1164 {
1165     int fd;
1166
1167     if (addr->type != SOCKET_ADDRESS_TYPE_FD) {
1168         return 0;
1169     }
1170
1171     fd = socket_get_fd(addr->u.fd.str, errp);
1172     if (fd < 0) {
1173         return fd;
1174     }
1175
1176     g_free(addr->u.fd.str);
1177     addr->u.fd.str = g_strdup_printf("%d", fd);
1178
1179     return 0;
1180 }
1181
1182 int socket_connect(SocketAddress *addr, Error **errp)
1183 {
1184     int fd;
1185
1186     switch (addr->type) {
1187     case SOCKET_ADDRESS_TYPE_INET:
1188         fd = inet_connect_saddr(&addr->u.inet, errp);
1189         break;
1190
1191     case SOCKET_ADDRESS_TYPE_UNIX:
1192         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1193         break;
1194
1195     case SOCKET_ADDRESS_TYPE_FD:
1196         fd = socket_get_fd(addr->u.fd.str, errp);
1197         break;
1198
1199     case SOCKET_ADDRESS_TYPE_VSOCK:
1200         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1201         break;
1202
1203     default:
1204         abort();
1205     }
1206     return fd;
1207 }
1208
1209 int socket_listen(SocketAddress *addr, int num, Error **errp)
1210 {
1211     int fd;
1212
1213     trace_socket_listen(num);
1214     switch (addr->type) {
1215     case SOCKET_ADDRESS_TYPE_INET:
1216         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1217         break;
1218
1219     case SOCKET_ADDRESS_TYPE_UNIX:
1220         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1221         break;
1222
1223     case SOCKET_ADDRESS_TYPE_FD:
1224         fd = socket_get_fd(addr->u.fd.str, errp);
1225         if (fd < 0) {
1226             return -1;
1227         }
1228
1229         /*
1230          * If the socket is not yet in the listen state, then transition it to
1231          * the listen state now.
1232          *
1233          * If it's already listening then this updates the backlog value as
1234          * requested.
1235          *
1236          * If this socket cannot listen because it's already in another state
1237          * (e.g. unbound or connected) then we'll catch the error here.
1238          */
1239         if (listen(fd, num) != 0) {
1240             error_setg_errno(errp, errno, "Failed to listen on fd socket");
1241             close(fd);
1242             return -1;
1243         }
1244         break;
1245
1246     case SOCKET_ADDRESS_TYPE_VSOCK:
1247         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1248         break;
1249
1250     default:
1251         abort();
1252     }
1253     return fd;
1254 }
1255
1256 void socket_listen_cleanup(int fd, Error **errp)
1257 {
1258     SocketAddress *addr;
1259
1260     addr = socket_local_address(fd, errp);
1261     if (!addr) {
1262         return;
1263     }
1264
1265     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1266         && addr->u.q_unix.path) {
1267         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1268             error_setg_errno(errp, errno,
1269                              "Failed to unlink socket %s",
1270                              addr->u.q_unix.path);
1271         }
1272     }
1273
1274     qapi_free_SocketAddress(addr);
1275 }
1276
1277 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1278 {
1279     int fd;
1280
1281     /*
1282      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1283      * (although other address families can do SOCK_DGRAM, too)
1284      */
1285     switch (remote->type) {
1286     case SOCKET_ADDRESS_TYPE_INET:
1287         fd = inet_dgram_saddr(&remote->u.inet,
1288                               local ? &local->u.inet : NULL, errp);
1289         break;
1290
1291     default:
1292         error_setg(errp, "socket type unsupported for datagram");
1293         fd = -1;
1294     }
1295     return fd;
1296 }
1297
1298
1299 static SocketAddress *
1300 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1301                                 socklen_t salen,
1302                                 Error **errp)
1303 {
1304     char host[NI_MAXHOST];
1305     char serv[NI_MAXSERV];
1306     SocketAddress *addr;
1307     InetSocketAddress *inet;
1308     int ret;
1309
1310     ret = getnameinfo((struct sockaddr *)sa, salen,
1311                       host, sizeof(host),
1312                       serv, sizeof(serv),
1313                       NI_NUMERICHOST | NI_NUMERICSERV);
1314     if (ret != 0) {
1315         error_setg(errp, "Cannot format numeric socket address: %s",
1316                    gai_strerror(ret));
1317         return NULL;
1318     }
1319
1320     addr = g_new0(SocketAddress, 1);
1321     addr->type = SOCKET_ADDRESS_TYPE_INET;
1322     inet = &addr->u.inet;
1323     inet->host = g_strdup(host);
1324     inet->port = g_strdup(serv);
1325     if (sa->ss_family == AF_INET) {
1326         inet->has_ipv4 = inet->ipv4 = true;
1327     } else {
1328         inet->has_ipv6 = inet->ipv6 = true;
1329     }
1330
1331     return addr;
1332 }
1333
1334
1335 static SocketAddress *
1336 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1337                                 socklen_t salen,
1338                                 Error **errp)
1339 {
1340     SocketAddress *addr;
1341     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1342
1343     addr = g_new0(SocketAddress, 1);
1344     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1345     salen -= offsetof(struct sockaddr_un, sun_path);
1346 #ifdef CONFIG_LINUX
1347     if (salen > 0 && !su->sun_path[0]) {
1348         /* Linux abstract socket */
1349         addr->u.q_unix.path = g_strndup(su->sun_path + 1, salen - 1);
1350         addr->u.q_unix.has_abstract = true;
1351         addr->u.q_unix.abstract = true;
1352         addr->u.q_unix.has_tight = true;
1353         addr->u.q_unix.tight = salen < sizeof(su->sun_path);
1354         return addr;
1355     }
1356 #endif
1357
1358     addr->u.q_unix.path = g_strndup(su->sun_path, salen);
1359     return addr;
1360 }
1361
1362 #ifdef CONFIG_AF_VSOCK
1363 static SocketAddress *
1364 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1365                                  socklen_t salen,
1366                                  Error **errp)
1367 {
1368     SocketAddress *addr;
1369     VsockSocketAddress *vaddr;
1370     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1371
1372     addr = g_new0(SocketAddress, 1);
1373     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1374     vaddr = &addr->u.vsock;
1375     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1376     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1377
1378     return addr;
1379 }
1380 #endif /* CONFIG_AF_VSOCK */
1381
1382 SocketAddress *
1383 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1384                            socklen_t salen,
1385                            Error **errp)
1386 {
1387     switch (sa->ss_family) {
1388     case AF_INET:
1389     case AF_INET6:
1390         return socket_sockaddr_to_address_inet(sa, salen, errp);
1391
1392     case AF_UNIX:
1393         return socket_sockaddr_to_address_unix(sa, salen, errp);
1394
1395 #ifdef CONFIG_AF_VSOCK
1396     case AF_VSOCK:
1397         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1398 #endif
1399
1400     default:
1401         error_setg(errp, "socket family %d unsupported",
1402                    sa->ss_family);
1403         return NULL;
1404     }
1405     return 0;
1406 }
1407
1408
1409 SocketAddress *socket_local_address(int fd, Error **errp)
1410 {
1411     struct sockaddr_storage ss;
1412     socklen_t sslen = sizeof(ss);
1413
1414     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1415         error_setg_errno(errp, errno, "%s",
1416                          "Unable to query local socket address");
1417         return NULL;
1418     }
1419
1420     return socket_sockaddr_to_address(&ss, sslen, errp);
1421 }
1422
1423
1424 SocketAddress *socket_remote_address(int fd, Error **errp)
1425 {
1426     struct sockaddr_storage ss;
1427     socklen_t sslen = sizeof(ss);
1428
1429     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1430         error_setg_errno(errp, errno, "%s",
1431                          "Unable to query remote socket address");
1432         return NULL;
1433     }
1434
1435     return socket_sockaddr_to_address(&ss, sslen, errp);
1436 }
1437
1438
1439 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1440 {
1441     SocketAddress *addr;
1442
1443     if (!addr_legacy) {
1444         return NULL;
1445     }
1446
1447     addr = g_new(SocketAddress, 1);
1448
1449     switch (addr_legacy->type) {
1450     case SOCKET_ADDRESS_TYPE_INET:
1451         addr->type = SOCKET_ADDRESS_TYPE_INET;
1452         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1453                            addr_legacy->u.inet.data);
1454         break;
1455     case SOCKET_ADDRESS_TYPE_UNIX:
1456         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1457         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1458                            addr_legacy->u.q_unix.data);
1459         break;
1460     case SOCKET_ADDRESS_TYPE_VSOCK:
1461         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1462         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1463                            addr_legacy->u.vsock.data);
1464         break;
1465     case SOCKET_ADDRESS_TYPE_FD:
1466         addr->type = SOCKET_ADDRESS_TYPE_FD;
1467         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1468         break;
1469     default:
1470         abort();
1471     }
1472
1473     return addr;
1474 }