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             closesocket(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 static bool saddr_is_abstract(UnixSocketAddress *saddr)
 884 {
 885 #ifdef CONFIG_LINUX
 886     return saddr->abstract;
 887 #else
 888     return false;
 889 #endif
 890 }
 891
 892 static bool saddr_is_tight(UnixSocketAddress *saddr)
 893 {
 894 #ifdef CONFIG_LINUX
 895     return !saddr->has_tight || saddr->tight;
 896 #else
 897     return false;
 898 #endif
 899 }
 900
 901 static int unix_listen_saddr(UnixSocketAddress *saddr,
 902                              int num,
 903                              Error **errp)
 904 {
 905     bool abstract = saddr_is_abstract(saddr);
 906     struct sockaddr_un un;
 907     int sock, fd;
 908     char *pathbuf = NULL;
 909     const char *path;
 910     size_t pathlen;
 911     size_t addrlen;
 912
 913     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 914     if (sock < 0) {
 915         error_setg_errno(errp, errno, "Failed to create Unix socket");
 916         return -1;
 917     }
 918
 919     if (saddr->path[0] || abstract) {
 920         path = saddr->path;
 921     } else {
 922         const char *tmpdir = getenv("TMPDIR");
 923         tmpdir = tmpdir ? tmpdir : "/tmp";
 924         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 925     }
 926
 927     pathlen = strlen(path);
 928     if (pathlen > sizeof(un.sun_path) ||
 929         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
 930         error_setg(errp, "UNIX socket path '%s' is too long", path);
 931         error_append_hint(errp, "Path must be less than %zu bytes\n",
 932                           abstract ? sizeof(un.sun_path) - 1 :
 933                           sizeof(un.sun_path));
 934         goto err;
 935     }
 936
 937     if (pathbuf != NULL) {
 938         /*
 939          * This dummy fd usage silences the mktemp() unsecure warning.
 940          * Using mkstemp() doesn't make things more secure here
 941          * though.  bind() complains about existing files, so we have
 942          * to unlink first and thus re-open the race window.  The
 943          * worst case possible is bind() failing, i.e. a DoS attack.
 944          */
 945         fd = mkstemp(pathbuf);
 946         if (fd < 0) {
 947             error_setg_errno(errp, errno,
 948                              "Failed to make a temporary socket %s", pathbuf);
 949             goto err;
 950         }
 951         close(fd);
 952     }
 953
 954     if (!abstract && unlink(path) < 0 && errno != ENOENT) {
 955         error_setg_errno(errp, errno,
 956                          "Failed to unlink socket %s", path);
 957         goto err;
 958     }
 959
 960     memset(&un, 0, sizeof(un));
 961     un.sun_family = AF_UNIX;
 962     addrlen = sizeof(un);
 963
 964     if (abstract) {
 965         un.sun_path[0] = '\0';
 966         memcpy(&un.sun_path[1], path, pathlen);
 967         if (saddr_is_tight(saddr)) {
 968             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
 969         }
 970     } else {
 971         memcpy(un.sun_path, path, pathlen);
 972     }
 973
 974     if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) {
 975         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 976         goto err;
 977     }
 978     if (listen(sock, num) < 0) {
 979         error_setg_errno(errp, errno, "Failed to listen on socket");
 980         goto err;
 981     }
 982
 983     g_free(pathbuf);
 984     return sock;
 985
 986 err:
 987     g_free(pathbuf);
 988     closesocket(sock);
 989     return -1;
 990 }
 991
 992 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 993 {
 994     bool abstract = saddr_is_abstract(saddr);
 995     struct sockaddr_un un;
 996     int sock, rc;
 997     size_t pathlen;
 998     size_t addrlen;
 999
1000     if (saddr->path == NULL) {
1001         error_setg(errp, "unix connect: no path specified");
1002         return -1;
1003     }
1004
1005     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
1006     if (sock < 0) {
1007         error_setg_errno(errp, errno, "Failed to create socket");
1008         return -1;
1009     }
1010
1011     pathlen = strlen(saddr->path);
1012     if (pathlen > sizeof(un.sun_path) ||
1013         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
1014         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
1015         error_append_hint(errp, "Path must be less than %zu bytes\n",
1016                           abstract ? sizeof(un.sun_path) - 1 :
1017                           sizeof(un.sun_path));
1018         goto err;
1019     }
1020
1021     memset(&un, 0, sizeof(un));
1022     un.sun_family = AF_UNIX;
1023     addrlen = sizeof(un);
1024
1025     if (abstract) {
1026         un.sun_path[0] = '\0';
1027         memcpy(&un.sun_path[1], saddr->path, pathlen);
1028         if (saddr_is_tight(saddr)) {
1029             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
1030         }
1031     } else {
1032         memcpy(un.sun_path, saddr->path, pathlen);
1033     }
1034     /* connect to peer */
1035     do {
1036         rc = 0;
1037         if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) {
1038             rc = -errno;
1039         }
1040     } while (rc == -EINTR);
1041
1042     if (rc < 0) {
1043         error_setg_errno(errp, -rc, "Failed to connect to '%s'",
1044                          saddr->path);
1045         goto err;
1046     }
1047
1048     return sock;
1049
1050  err:
1051     closesocket(sock);
1052     return -1;
1053 }
1054
1055 /* compatibility wrapper */
1056 int unix_listen(const char *str, Error **errp)
1057 {
1058     UnixSocketAddress *saddr;
1059     int sock;
1060
1061     saddr = g_new0(UnixSocketAddress, 1);
1062     saddr->path = g_strdup(str);
1063     sock = unix_listen_saddr(saddr, 1, errp);
1064     qapi_free_UnixSocketAddress(saddr);
1065     return sock;
1066 }
1067
1068 int unix_connect(const char *path, Error **errp)
1069 {
1070     UnixSocketAddress *saddr;
1071     int sock;
1072
1073     saddr = g_new0(UnixSocketAddress, 1);
1074     saddr->path = g_strdup(path);
1075     sock = unix_connect_saddr(saddr, errp);
1076     qapi_free_UnixSocketAddress(saddr);
1077     return sock;
1078 }
1079
1080 char *socket_uri(SocketAddress *addr)
1081 {
1082     switch (addr->type) {
1083     case SOCKET_ADDRESS_TYPE_INET:
1084         return g_strdup_printf("tcp:%s:%s",
1085                                addr->u.inet.host,
1086                                addr->u.inet.port);
1087     case SOCKET_ADDRESS_TYPE_UNIX:
1088         return g_strdup_printf("unix:%s",
1089                                addr->u.q_unix.path);
1090     case SOCKET_ADDRESS_TYPE_FD:
1091         return g_strdup_printf("fd:%s", addr->u.fd.str);
1092     case SOCKET_ADDRESS_TYPE_VSOCK:
1093         return g_strdup_printf("tcp:%s:%s",
1094                                addr->u.vsock.cid,
1095                                addr->u.vsock.port);
1096     default:
1097         return g_strdup("unknown address type");
1098     }
1099 }
1100
1101 SocketAddress *socket_parse(const char *str, Error **errp)
1102 {
1103     SocketAddress *addr;
1104
1105     addr = g_new0(SocketAddress, 1);
1106     if (strstart(str, "unix:", NULL)) {
1107         if (str[5] == '\0') {
1108             error_setg(errp, "invalid Unix socket address");
1109             goto fail;
1110         } else {
1111             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1112             addr->u.q_unix.path = g_strdup(str + 5);
1113         }
1114     } else if (strstart(str, "fd:", NULL)) {
1115         if (str[3] == '\0') {
1116             error_setg(errp, "invalid file descriptor address");
1117             goto fail;
1118         } else {
1119             addr->type = SOCKET_ADDRESS_TYPE_FD;
1120             addr->u.fd.str = g_strdup(str + 3);
1121         }
1122     } else if (strstart(str, "vsock:", NULL)) {
1123         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1124         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1125             goto fail;
1126         }
1127     } else {
1128         addr->type = SOCKET_ADDRESS_TYPE_INET;
1129         if (inet_parse(&addr->u.inet, str, errp)) {
1130             goto fail;
1131         }
1132     }
1133     return addr;
1134
1135 fail:
1136     qapi_free_SocketAddress(addr);
1137     return NULL;
1138 }
1139
1140 static int socket_get_fd(const char *fdstr, Error **errp)
1141 {
1142     Monitor *cur_mon = monitor_cur();
1143     int fd;
1144     if (cur_mon) {
1145         fd = monitor_get_fd(cur_mon, fdstr, errp);
1146         if (fd < 0) {
1147             return -1;
1148         }
1149     } else {
1150         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1151             error_setg_errno(errp, errno,
1152                              "Unable to parse FD number %s",
1153                              fdstr);
1154             return -1;
1155         }
1156     }
1157     if (!fd_is_socket(fd)) {
1158         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1159         close(fd);
1160         return -1;
1161     }
1162     return fd;
1163 }
1164
1165 int socket_address_parse_named_fd(SocketAddress *addr, Error **errp)
1166 {
1167     int fd;
1168
1169     if (addr->type != SOCKET_ADDRESS_TYPE_FD) {
1170         return 0;
1171     }
1172
1173     fd = socket_get_fd(addr->u.fd.str, errp);
1174     if (fd < 0) {
1175         return fd;
1176     }
1177
1178     g_free(addr->u.fd.str);
1179     addr->u.fd.str = g_strdup_printf("%d", fd);
1180
1181     return 0;
1182 }
1183
1184 int socket_connect(SocketAddress *addr, Error **errp)
1185 {
1186     int fd;
1187
1188     switch (addr->type) {
1189     case SOCKET_ADDRESS_TYPE_INET:
1190         fd = inet_connect_saddr(&addr->u.inet, errp);
1191         break;
1192
1193     case SOCKET_ADDRESS_TYPE_UNIX:
1194         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1195         break;
1196
1197     case SOCKET_ADDRESS_TYPE_FD:
1198         fd = socket_get_fd(addr->u.fd.str, errp);
1199         break;
1200
1201     case SOCKET_ADDRESS_TYPE_VSOCK:
1202         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1203         break;
1204
1205     default:
1206         abort();
1207     }
1208     return fd;
1209 }
1210
1211 int socket_listen(SocketAddress *addr, int num, Error **errp)
1212 {
1213     int fd;
1214
1215     trace_socket_listen(num);
1216     switch (addr->type) {
1217     case SOCKET_ADDRESS_TYPE_INET:
1218         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1219         break;
1220
1221     case SOCKET_ADDRESS_TYPE_UNIX:
1222         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1223         break;
1224
1225     case SOCKET_ADDRESS_TYPE_FD:
1226         fd = socket_get_fd(addr->u.fd.str, errp);
1227         if (fd < 0) {
1228             return -1;
1229         }
1230
1231         /*
1232          * If the socket is not yet in the listen state, then transition it to
1233          * the listen state now.
1234          *
1235          * If it's already listening then this updates the backlog value as
1236          * requested.
1237          *
1238          * If this socket cannot listen because it's already in another state
1239          * (e.g. unbound or connected) then we'll catch the error here.
1240          */
1241         if (listen(fd, num) != 0) {
1242             error_setg_errno(errp, errno, "Failed to listen on fd socket");
1243             closesocket(fd);
1244             return -1;
1245         }
1246         break;
1247
1248     case SOCKET_ADDRESS_TYPE_VSOCK:
1249         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1250         break;
1251
1252     default:
1253         abort();
1254     }
1255     return fd;
1256 }
1257
1258 void socket_listen_cleanup(int fd, Error **errp)
1259 {
1260     SocketAddress *addr;
1261
1262     addr = socket_local_address(fd, errp);
1263     if (!addr) {
1264         return;
1265     }
1266
1267     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1268         && addr->u.q_unix.path) {
1269         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1270             error_setg_errno(errp, errno,
1271                              "Failed to unlink socket %s",
1272                              addr->u.q_unix.path);
1273         }
1274     }
1275
1276     qapi_free_SocketAddress(addr);
1277 }
1278
1279 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1280 {
1281     int fd;
1282
1283     /*
1284      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1285      * (although other address families can do SOCK_DGRAM, too)
1286      */
1287     switch (remote->type) {
1288     case SOCKET_ADDRESS_TYPE_INET:
1289         fd = inet_dgram_saddr(&remote->u.inet,
1290                               local ? &local->u.inet : NULL, errp);
1291         break;
1292
1293     default:
1294         error_setg(errp, "socket type unsupported for datagram");
1295         fd = -1;
1296     }
1297     return fd;
1298 }
1299
1300
1301 static SocketAddress *
1302 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1303                                 socklen_t salen,
1304                                 Error **errp)
1305 {
1306     char host[NI_MAXHOST];
1307     char serv[NI_MAXSERV];
1308     SocketAddress *addr;
1309     InetSocketAddress *inet;
1310     int ret;
1311
1312     ret = getnameinfo((struct sockaddr *)sa, salen,
1313                       host, sizeof(host),
1314                       serv, sizeof(serv),
1315                       NI_NUMERICHOST | NI_NUMERICSERV);
1316     if (ret != 0) {
1317         error_setg(errp, "Cannot format numeric socket address: %s",
1318                    gai_strerror(ret));
1319         return NULL;
1320     }
1321
1322     addr = g_new0(SocketAddress, 1);
1323     addr->type = SOCKET_ADDRESS_TYPE_INET;
1324     inet = &addr->u.inet;
1325     inet->host = g_strdup(host);
1326     inet->port = g_strdup(serv);
1327     if (sa->ss_family == AF_INET) {
1328         inet->has_ipv4 = inet->ipv4 = true;
1329     } else {
1330         inet->has_ipv6 = inet->ipv6 = true;
1331     }
1332
1333     return addr;
1334 }
1335
1336
1337 static SocketAddress *
1338 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1339                                 socklen_t salen,
1340                                 Error **errp)
1341 {
1342     SocketAddress *addr;
1343     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1344
1345     addr = g_new0(SocketAddress, 1);
1346     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1347     salen -= offsetof(struct sockaddr_un, sun_path);
1348 #ifdef CONFIG_LINUX
1349     if (salen > 0 && !su->sun_path[0]) {
1350         /* Linux abstract socket */
1351         addr->u.q_unix.path = g_strndup(su->sun_path + 1, salen - 1);
1352         addr->u.q_unix.has_abstract = true;
1353         addr->u.q_unix.abstract = true;
1354         addr->u.q_unix.has_tight = true;
1355         addr->u.q_unix.tight = salen < sizeof(su->sun_path);
1356         return addr;
1357     }
1358 #endif
1359
1360     addr->u.q_unix.path = g_strndup(su->sun_path, salen);
1361     return addr;
1362 }
1363
1364 #ifdef CONFIG_AF_VSOCK
1365 static SocketAddress *
1366 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1367                                  socklen_t salen,
1368                                  Error **errp)
1369 {
1370     SocketAddress *addr;
1371     VsockSocketAddress *vaddr;
1372     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1373
1374     addr = g_new0(SocketAddress, 1);
1375     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1376     vaddr = &addr->u.vsock;
1377     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1378     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1379
1380     return addr;
1381 }
1382 #endif /* CONFIG_AF_VSOCK */
1383
1384 SocketAddress *
1385 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1386                            socklen_t salen,
1387                            Error **errp)
1388 {
1389     switch (sa->ss_family) {
1390     case AF_INET:
1391     case AF_INET6:
1392         return socket_sockaddr_to_address_inet(sa, salen, errp);
1393
1394     case AF_UNIX:
1395         return socket_sockaddr_to_address_unix(sa, salen, errp);
1396
1397 #ifdef CONFIG_AF_VSOCK
1398     case AF_VSOCK:
1399         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1400 #endif
1401
1402     default:
1403         error_setg(errp, "socket family %d unsupported",
1404                    sa->ss_family);
1405         return NULL;
1406     }
1407     return 0;
1408 }
1409
1410
1411 SocketAddress *socket_local_address(int fd, Error **errp)
1412 {
1413     struct sockaddr_storage ss;
1414     socklen_t sslen = sizeof(ss);
1415
1416     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1417         error_setg_errno(errp, errno, "%s",
1418                          "Unable to query local socket address");
1419         return NULL;
1420     }
1421
1422     return socket_sockaddr_to_address(&ss, sslen, errp);
1423 }
1424
1425
1426 SocketAddress *socket_remote_address(int fd, Error **errp)
1427 {
1428     struct sockaddr_storage ss;
1429     socklen_t sslen = sizeof(ss);
1430
1431     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1432         error_setg_errno(errp, errno, "%s",
1433                          "Unable to query remote socket address");
1434         return NULL;
1435     }
1436
1437     return socket_sockaddr_to_address(&ss, sslen, errp);
1438 }
1439
1440
1441 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1442 {
1443     SocketAddress *addr;
1444
1445     if (!addr_legacy) {
1446         return NULL;
1447     }
1448
1449     addr = g_new(SocketAddress, 1);
1450
1451     switch (addr_legacy->type) {
1452     case SOCKET_ADDRESS_TYPE_INET:
1453         addr->type = SOCKET_ADDRESS_TYPE_INET;
1454         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1455                            addr_legacy->u.inet.data);
1456         break;
1457     case SOCKET_ADDRESS_TYPE_UNIX:
1458         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1459         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1460                            addr_legacy->u.q_unix.data);
1461         break;
1462     case SOCKET_ADDRESS_TYPE_VSOCK:
1463         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1464         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1465                            addr_legacy->u.vsock.data);
1466         break;
1467     case SOCKET_ADDRESS_TYPE_FD:
1468         addr->type = SOCKET_ADDRESS_TYPE_FD;
1469         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1470         break;
1471     default:
1472         abort();
1473     }
1474
1475     return addr;
1476 }