util/qemu-sockets.c

   1 /*
   2  *  inet and unix socket functions for qemu
   3  *
   4  *  (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; under version 2 of the License.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  * Contributions after 2012-01-13 are licensed under the terms of the
  16  * GNU GPL, version 2 or (at your option) any later version.
  17  */
  18 #include "qemu/osdep.h"
  19
  20 #ifdef CONFIG_AF_VSOCK
  21 #include <linux/vm_sockets.h>
  22 #endif /* CONFIG_AF_VSOCK */
  23
  24 #include "qemu-common.h"
  25 #include "monitor/monitor.h"
  26 #include "qapi/clone-visitor.h"
  27 #include "qapi/error.h"
  28 #include "qapi/qapi-visit-sockets.h"
  29 #include "qemu/sockets.h"
  30 #include "qemu/main-loop.h"
  31 #include "qapi/qobject-input-visitor.h"
  32 #include "qapi/qobject-output-visitor.h"
  33 #include "qemu/cutils.h"
  34 #include "trace.h"
  35
  36 #ifndef AI_ADDRCONFIG
  37 # define AI_ADDRCONFIG 0
  38 #endif
  39
  40 #ifndef AI_V4MAPPED
  41 # define AI_V4MAPPED 0
  42 #endif
  43
  44 #ifndef AI_NUMERICSERV
  45 # define AI_NUMERICSERV 0
  46 #endif
  47
  48
  49 static int inet_getport(struct addrinfo *e)
  50 {
  51     struct sockaddr_in *i4;
  52     struct sockaddr_in6 *i6;
  53
  54     switch (e->ai_family) {
  55     case PF_INET6:
  56         i6 = (void*)e->ai_addr;
  57         return ntohs(i6->sin6_port);
  58     case PF_INET:
  59         i4 = (void*)e->ai_addr;
  60         return ntohs(i4->sin_port);
  61     default:
  62         return 0;
  63     }
  64 }
  65
  66 static void inet_setport(struct addrinfo *e, int port)
  67 {
  68     struct sockaddr_in *i4;
  69     struct sockaddr_in6 *i6;
  70
  71     switch (e->ai_family) {
  72     case PF_INET6:
  73         i6 = (void*)e->ai_addr;
  74         i6->sin6_port = htons(port);
  75         break;
  76     case PF_INET:
  77         i4 = (void*)e->ai_addr;
  78         i4->sin_port = htons(port);
  79         break;
  80     }
  81 }
  82
  83 NetworkAddressFamily inet_netfamily(int family)
  84 {
  85     switch (family) {
  86     case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
  87     case PF_INET:  return NETWORK_ADDRESS_FAMILY_IPV4;
  88     case PF_UNIX:  return NETWORK_ADDRESS_FAMILY_UNIX;
  89 #ifdef CONFIG_AF_VSOCK
  90     case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK;
  91 #endif /* CONFIG_AF_VSOCK */
  92     }
  93     return NETWORK_ADDRESS_FAMILY_UNKNOWN;
  94 }
  95
  96 bool fd_is_socket(int fd)
  97 {
  98     int optval;
  99     socklen_t optlen = sizeof(optval);
 100     return !qemu_getsockopt(fd, SOL_SOCKET, SO_TYPE, &optval, &optlen);
 101 }
 102
 103
 104 /*
 105  * Matrix we're trying to apply
 106  *
 107  *  ipv4  ipv6   family
 108  *   -     -       PF_UNSPEC
 109  *   -     f       PF_INET
 110  *   -     t       PF_INET6
 111  *   f     -       PF_INET6
 112  *   f     f       <error>
 113  *   f     t       PF_INET6
 114  *   t     -       PF_INET
 115  *   t     f       PF_INET
 116  *   t     t       PF_INET6/PF_UNSPEC
 117  *
 118  * NB, this matrix is only about getting the necessary results
 119  * from getaddrinfo(). Some of the cases require further work
 120  * after reading results from getaddrinfo in order to fully
 121  * apply the logic the end user wants.
 122  *
 123  * In the first and last cases, we must set IPV6_V6ONLY=0
 124  * when binding, to allow a single listener to potentially
 125  * accept both IPv4+6 addresses.
 126  */
 127 int inet_ai_family_from_address(InetSocketAddress *addr,
 128                                 Error **errp)
 129 {
 130     if (addr->has_ipv6 && addr->has_ipv4 &&
 131         !addr->ipv6 && !addr->ipv4) {
 132         error_setg(errp, "Cannot disable IPv4 and IPv6 at same time");
 133         return PF_UNSPEC;
 134     }
 135     if ((addr->has_ipv6 && addr->ipv6) && (addr->has_ipv4 && addr->ipv4)) {
 136         /*
 137          * Some backends can only do a single listener. In that case
 138          * we want empty hostname to resolve to "::" and then use the
 139          * flag IPV6_V6ONLY==0 to get both protocols on 1 socket. This
 140          * doesn't work for addresses other than "", so they're just
 141          * inevitably broken until multiple listeners can be used,
 142          * and thus we honour getaddrinfo automatic protocol detection
 143          * Once all backends do multi-listener, remove the PF_INET6
 144          * branch entirely.
 145          */
 146         if (!addr->host || g_str_equal(addr->host, "")) {
 147             return PF_INET6;
 148         } else {
 149             return PF_UNSPEC;
 150         }
 151     }
 152     if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) {
 153         return PF_INET6;
 154     }
 155     if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) {
 156         return PF_INET;
 157     }
 158     return PF_UNSPEC;
 159 }
 160
 161 static int create_fast_reuse_socket(struct addrinfo *e)
 162 {
 163     int slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 164     if (slisten < 0) {
 165         return -1;
 166     }
 167     socket_set_fast_reuse(slisten);
 168     return slisten;
 169 }
 170
 171 static int try_bind(int socket, InetSocketAddress *saddr, struct addrinfo *e)
 172 {
 173 #ifndef IPV6_V6ONLY
 174     return bind(socket, e->ai_addr, e->ai_addrlen);
 175 #else
 176     /*
 177      * Deals with first & last cases in matrix in comment
 178      * for inet_ai_family_from_address().
 179      */
 180     int v6only =
 181         ((!saddr->has_ipv4 && !saddr->has_ipv6) ||
 182          (saddr->has_ipv4 && saddr->ipv4 &&
 183           saddr->has_ipv6 && saddr->ipv6)) ? 0 : 1;
 184     int stat;
 185
 186  rebind:
 187     if (e->ai_family == PF_INET6) {
 188         qemu_setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, &v6only,
 189                         sizeof(v6only));
 190     }
 191
 192     stat = bind(socket, e->ai_addr, e->ai_addrlen);
 193     if (!stat) {
 194         return 0;
 195     }
 196
 197     /* If we got EADDRINUSE from an IPv6 bind & v6only is unset,
 198      * it could be that the IPv4 port is already claimed, so retry
 199      * with v6only set
 200      */
 201     if (e->ai_family == PF_INET6 && errno == EADDRINUSE && !v6only) {
 202         v6only = 1;
 203         goto rebind;
 204     }
 205     return stat;
 206 #endif
 207 }
 208
 209 static int inet_listen_saddr(InetSocketAddress *saddr,
 210                              int port_offset,
 211                              int num,
 212                              Error **errp)
 213 {
 214     struct addrinfo ai,*res,*e;
 215     char port[33];
 216     char uaddr[INET6_ADDRSTRLEN+1];
 217     char uport[33];
 218     int rc, port_min, port_max, p;
 219     int slisten = -1;
 220     int saved_errno = 0;
 221     bool socket_created = false;
 222     Error *err = NULL;
 223
 224     if (saddr->keep_alive) {
 225         error_setg(errp, "keep-alive option is not supported for passive "
 226                    "sockets");
 227         return -1;
 228     }
 229
 230     memset(&ai,0, sizeof(ai));
 231     ai.ai_flags = AI_PASSIVE;
 232     if (saddr->has_numeric && saddr->numeric) {
 233         ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
 234     }
 235     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 236     ai.ai_socktype = SOCK_STREAM;
 237
 238     if (err) {
 239         error_propagate(errp, err);
 240         return -1;
 241     }
 242
 243     if (saddr->host == NULL) {
 244         error_setg(errp, "host not specified");
 245         return -1;
 246     }
 247     if (saddr->port != NULL) {
 248         pstrcpy(port, sizeof(port), saddr->port);
 249     } else {
 250         port[0] = '\0';
 251     }
 252
 253     /* lookup */
 254     if (port_offset) {
 255         unsigned long long baseport;
 256         if (strlen(port) == 0) {
 257             error_setg(errp, "port not specified");
 258             return -1;
 259         }
 260         if (parse_uint_full(port, &baseport, 10) < 0) {
 261             error_setg(errp, "can't convert to a number: %s", port);
 262             return -1;
 263         }
 264         if (baseport > 65535 ||
 265             baseport + port_offset > 65535) {
 266             error_setg(errp, "port %s out of range", port);
 267             return -1;
 268         }
 269         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 270     }
 271     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 272                      strlen(port) ? port : NULL, &ai, &res);
 273     if (rc != 0) {
 274         error_setg(errp, "address resolution failed for %s:%s: %s",
 275                    saddr->host, port, gai_strerror(rc));
 276         return -1;
 277     }
 278
 279     /* create socket + bind/listen */
 280     for (e = res; e != NULL; e = e->ai_next) {
 281         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 282                         uaddr,INET6_ADDRSTRLEN,uport,32,
 283                         NI_NUMERICHOST | NI_NUMERICSERV);
 284
 285         port_min = inet_getport(e);
 286         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 287         for (p = port_min; p <= port_max; p++) {
 288             inet_setport(e, p);
 289
 290             slisten = create_fast_reuse_socket(e);
 291             if (slisten < 0) {
 292                 /* First time we expect we might fail to create the socket
 293                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 294                  * Later iterations should always succeed if first iteration
 295                  * worked though, so treat that as fatal.
 296                  */
 297                 if (p == port_min) {
 298                     continue;
 299                 } else {
 300                     error_setg_errno(errp, errno,
 301                                      "Failed to recreate failed listening socket");
 302                     goto listen_failed;
 303                 }
 304             }
 305             socket_created = true;
 306
 307             rc = try_bind(slisten, saddr, e);
 308             if (rc < 0) {
 309                 if (errno != EADDRINUSE) {
 310                     error_setg_errno(errp, errno, "Failed to bind socket");
 311                     goto listen_failed;
 312                 }
 313             } else {
 314                 if (!listen(slisten, num)) {
 315                     goto listen_ok;
 316                 }
 317                 if (errno != EADDRINUSE) {
 318                     error_setg_errno(errp, errno, "Failed to listen on socket");
 319                     goto listen_failed;
 320                 }
 321             }
 322             /* Someone else managed to bind to the same port and beat us
 323              * to listen on it! Socket semantics does not allow us to
 324              * recover from this situation, so we need to recreate the
 325              * socket to allow bind attempts for subsequent ports:
 326              */
 327             closesocket(slisten);
 328             slisten = -1;
 329         }
 330     }
 331     error_setg_errno(errp, errno,
 332                      socket_created ?
 333                      "Failed to find an available port" :
 334                      "Failed to create a socket");
 335 listen_failed:
 336     saved_errno = errno;
 337     if (slisten >= 0) {
 338         closesocket(slisten);
 339     }
 340     freeaddrinfo(res);
 341     errno = saved_errno;
 342     return -1;
 343
 344 listen_ok:
 345     freeaddrinfo(res);
 346     return slisten;
 347 }
 348
 349 #ifdef _WIN32
 350 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 351     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 352 #else
 353 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 354     ((rc) == -EINPROGRESS)
 355 #endif
 356
 357 static int inet_connect_addr(const InetSocketAddress *saddr,
 358                              struct addrinfo *addr, Error **errp)
 359 {
 360     int sock, rc;
 361
 362     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 363     if (sock < 0) {
 364         error_setg_errno(errp, errno, "Failed to create socket family %d",
 365                          addr->ai_family);
 366         return -1;
 367     }
 368     socket_set_fast_reuse(sock);
 369
 370     /* connect to peer */
 371     do {
 372         rc = 0;
 373         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 374             rc = -errno;
 375         }
 376     } while (rc == -EINTR);
 377
 378     if (rc < 0) {
 379         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 380                          saddr->host, saddr->port);
 381         closesocket(sock);
 382         return -1;
 383     }
 384
 385     return sock;
 386 }
 387
 388 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 389                                                  Error **errp)
 390 {
 391     struct addrinfo ai, *res;
 392     int rc;
 393     Error *err = NULL;
 394     static int useV4Mapped = 1;
 395
 396     memset(&ai, 0, sizeof(ai));
 397
 398     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 399     if (qatomic_read(&useV4Mapped)) {
 400         ai.ai_flags |= AI_V4MAPPED;
 401     }
 402     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 403     ai.ai_socktype = SOCK_STREAM;
 404
 405     if (err) {
 406         error_propagate(errp, err);
 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         sock = inet_connect_addr(saddr, e, &local_err);
 460         if (sock >= 0) {
 461             break;
 462         }
 463     }
 464
 465     freeaddrinfo(res);
 466
 467     if (sock < 0) {
 468         error_propagate(errp, local_err);
 469         return sock;
 470     }
 471
 472     if (saddr->keep_alive) {
 473         int val = 1;
 474         int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 475                                   &val, sizeof(val));
 476
 477         if (ret < 0) {
 478             error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
 479             close(sock);
 480             return -1;
 481         }
 482     }
 483
 484     return sock;
 485 }
 486
 487 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 488                             InetSocketAddress *sladdr,
 489                             Error **errp)
 490 {
 491     struct addrinfo ai, *peer = NULL, *local = NULL;
 492     const char *addr;
 493     const char *port;
 494     int sock = -1, rc;
 495     Error *err = NULL;
 496
 497     /* lookup peer addr */
 498     memset(&ai,0, sizeof(ai));
 499     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 500     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 501     ai.ai_socktype = SOCK_DGRAM;
 502
 503     if (err) {
 504         error_propagate(errp, err);
 505         goto err;
 506     }
 507
 508     addr = sraddr->host;
 509     port = sraddr->port;
 510     if (addr == NULL || strlen(addr) == 0) {
 511         addr = "localhost";
 512     }
 513     if (port == NULL || strlen(port) == 0) {
 514         error_setg(errp, "remote port not specified");
 515         goto err;
 516     }
 517
 518     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 519         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 520                    gai_strerror(rc));
 521         goto err;
 522     }
 523
 524     /* lookup local addr */
 525     memset(&ai,0, sizeof(ai));
 526     ai.ai_flags = AI_PASSIVE;
 527     ai.ai_family = peer->ai_family;
 528     ai.ai_socktype = SOCK_DGRAM;
 529
 530     if (sladdr) {
 531         addr = sladdr->host;
 532         port = sladdr->port;
 533         if (addr == NULL || strlen(addr) == 0) {
 534             addr = NULL;
 535         }
 536         if (!port || strlen(port) == 0) {
 537             port = "0";
 538         }
 539     } else {
 540         addr = NULL;
 541         port = "0";
 542     }
 543
 544     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 545         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 546                    gai_strerror(rc));
 547         goto err;
 548     }
 549
 550     /* create socket */
 551     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 552     if (sock < 0) {
 553         error_setg_errno(errp, errno, "Failed to create socket family %d",
 554                          peer->ai_family);
 555         goto err;
 556     }
 557     socket_set_fast_reuse(sock);
 558
 559     /* bind socket */
 560     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 561         error_setg_errno(errp, errno, "Failed to bind socket");
 562         goto err;
 563     }
 564
 565     /* connect to peer */
 566     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 567         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 568                          addr, port);
 569         goto err;
 570     }
 571
 572     freeaddrinfo(local);
 573     freeaddrinfo(peer);
 574     return sock;
 575
 576 err:
 577     if (sock != -1) {
 578         closesocket(sock);
 579     }
 580     if (local) {
 581         freeaddrinfo(local);
 582     }
 583     if (peer) {
 584         freeaddrinfo(peer);
 585     }
 586
 587     return -1;
 588 }
 589
 590 /* compatibility wrapper */
 591 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 592                            Error **errp)
 593 {
 594     char *end;
 595     size_t len;
 596
 597     end = strstr(optstr, ",");
 598     if (end) {
 599         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 600             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 601             return -1;
 602         }
 603         len = end - optstr;
 604     } else {
 605         len = strlen(optstr);
 606     }
 607     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 608         *val = true;
 609     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 610         *val = false;
 611     } else {
 612         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 613         return -1;
 614     }
 615     return 0;
 616 }
 617
 618 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 619 {
 620     const char *optstr, *h;
 621     char host[65];
 622     char port[33];
 623     int to;
 624     int pos;
 625     char *begin;
 626
 627     memset(addr, 0, sizeof(*addr));
 628
 629     /* parse address */
 630     if (str[0] == ':') {
 631         /* no host given */
 632         host[0] = '\0';
 633         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 634             error_setg(errp, "error parsing port in address '%s'", str);
 635             return -1;
 636         }
 637     } else if (str[0] == '[') {
 638         /* IPv6 addr */
 639         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 640             error_setg(errp, "error parsing IPv6 address '%s'", str);
 641             return -1;
 642         }
 643     } else {
 644         /* hostname or IPv4 addr */
 645         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 646             error_setg(errp, "error parsing address '%s'", str);
 647             return -1;
 648         }
 649     }
 650
 651     addr->host = g_strdup(host);
 652     addr->port = g_strdup(port);
 653
 654     /* parse options */
 655     optstr = str + pos;
 656     h = strstr(optstr, ",to=");
 657     if (h) {
 658         h += 4;
 659         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 660             (h[pos] != '\0' && h[pos] != ',')) {
 661             error_setg(errp, "error parsing to= argument");
 662             return -1;
 663         }
 664         addr->has_to = true;
 665         addr->to = to;
 666     }
 667     begin = strstr(optstr, ",ipv4");
 668     if (begin) {
 669         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 670             return -1;
 671         }
 672         addr->has_ipv4 = true;
 673     }
 674     begin = strstr(optstr, ",ipv6");
 675     if (begin) {
 676         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 677             return -1;
 678         }
 679         addr->has_ipv6 = true;
 680     }
 681     begin = strstr(optstr, ",keep-alive");
 682     if (begin) {
 683         if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"),
 684                             &addr->keep_alive, errp) < 0)
 685         {
 686             return -1;
 687         }
 688         addr->has_keep_alive = true;
 689     }
 690     return 0;
 691 }
 692
 693
 694 /**
 695  * Create a blocking socket and connect it to an address.
 696  *
 697  * @str: address string
 698  * @errp: set in case of an error
 699  *
 700  * Returns -1 in case of error, file descriptor on success
 701  **/
 702 int inet_connect(const char *str, Error **errp)
 703 {
 704     int sock = -1;
 705     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 706
 707     if (!inet_parse(addr, str, errp)) {
 708         sock = inet_connect_saddr(addr, errp);
 709     }
 710     qapi_free_InetSocketAddress(addr);
 711     return sock;
 712 }
 713
 714 #ifdef CONFIG_AF_VSOCK
 715 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 716                                           struct sockaddr_vm *svm,
 717                                           Error **errp)
 718 {
 719     unsigned long long val;
 720
 721     memset(svm, 0, sizeof(*svm));
 722     svm->svm_family = AF_VSOCK;
 723
 724     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 725         val > UINT32_MAX) {
 726         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 727         return false;
 728     }
 729     svm->svm_cid = val;
 730
 731     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 732         val > UINT32_MAX) {
 733         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 734         return false;
 735     }
 736     svm->svm_port = val;
 737
 738     return true;
 739 }
 740
 741 static int vsock_connect_addr(const VsockSocketAddress *vaddr,
 742                               const struct sockaddr_vm *svm, Error **errp)
 743 {
 744     int sock, rc;
 745
 746     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 747     if (sock < 0) {
 748         error_setg_errno(errp, errno, "Failed to create socket family %d",
 749                          AF_VSOCK);
 750         return -1;
 751     }
 752
 753     /* connect to peer */
 754     do {
 755         rc = 0;
 756         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 757             rc = -errno;
 758         }
 759     } while (rc == -EINTR);
 760
 761     if (rc < 0) {
 762         error_setg_errno(errp, errno, "Failed to connect to '%s:%s'",
 763                          vaddr->cid, vaddr->port);
 764         closesocket(sock);
 765         return -1;
 766     }
 767
 768     return sock;
 769 }
 770
 771 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 772 {
 773     struct sockaddr_vm svm;
 774
 775     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 776         return -1;
 777     }
 778
 779     return vsock_connect_addr(vaddr, &svm, errp);
 780 }
 781
 782 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 783                               int num,
 784                               Error **errp)
 785 {
 786     struct sockaddr_vm svm;
 787     int slisten;
 788
 789     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 790         return -1;
 791     }
 792
 793     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 794     if (slisten < 0) {
 795         error_setg_errno(errp, errno, "Failed to create socket");
 796         return -1;
 797     }
 798
 799     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 800         error_setg_errno(errp, errno, "Failed to bind socket");
 801         closesocket(slisten);
 802         return -1;
 803     }
 804
 805     if (listen(slisten, num) != 0) {
 806         error_setg_errno(errp, errno, "Failed to listen on socket");
 807         closesocket(slisten);
 808         return -1;
 809     }
 810     return slisten;
 811 }
 812
 813 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 814                        Error **errp)
 815 {
 816     char cid[33];
 817     char port[33];
 818     int n;
 819
 820     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 821         error_setg(errp, "error parsing address '%s'", str);
 822         return -1;
 823     }
 824     if (str[n] != '\0') {
 825         error_setg(errp, "trailing characters in address '%s'", str);
 826         return -1;
 827     }
 828
 829     addr->cid = g_strdup(cid);
 830     addr->port = g_strdup(port);
 831     return 0;
 832 }
 833 #else
 834 static void vsock_unsupported(Error **errp)
 835 {
 836     error_setg(errp, "socket family AF_VSOCK unsupported");
 837 }
 838
 839 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 840 {
 841     vsock_unsupported(errp);
 842     return -1;
 843 }
 844
 845 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 846                               int num,
 847                               Error **errp)
 848 {
 849     vsock_unsupported(errp);
 850     return -1;
 851 }
 852
 853 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 854                         Error **errp)
 855 {
 856     vsock_unsupported(errp);
 857     return -1;
 858 }
 859 #endif /* CONFIG_AF_VSOCK */
 860
 861 #ifndef _WIN32
 862
 863 static bool saddr_is_abstract(UnixSocketAddress *saddr)
 864 {
 865 #ifdef CONFIG_LINUX
 866     return saddr->abstract;
 867 #else
 868     return false;
 869 #endif
 870 }
 871
 872 static bool saddr_is_tight(UnixSocketAddress *saddr)
 873 {
 874 #ifdef CONFIG_LINUX
 875     return !saddr->has_tight || saddr->tight;
 876 #else
 877     return false;
 878 #endif
 879 }
 880
 881 static int unix_listen_saddr(UnixSocketAddress *saddr,
 882                              int num,
 883                              Error **errp)
 884 {
 885     bool abstract = saddr_is_abstract(saddr);
 886     struct sockaddr_un un;
 887     int sock, fd;
 888     char *pathbuf = NULL;
 889     const char *path;
 890     size_t pathlen;
 891     size_t addrlen;
 892
 893     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 894     if (sock < 0) {
 895         error_setg_errno(errp, errno, "Failed to create Unix socket");
 896         return -1;
 897     }
 898
 899     if (saddr->path[0] || abstract) {
 900         path = saddr->path;
 901     } else {
 902         const char *tmpdir = getenv("TMPDIR");
 903         tmpdir = tmpdir ? tmpdir : "/tmp";
 904         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 905     }
 906
 907     pathlen = strlen(path);
 908     if (pathlen > sizeof(un.sun_path) ||
 909         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
 910         error_setg(errp, "UNIX socket path '%s' is too long", path);
 911         error_append_hint(errp, "Path must be less than %zu bytes\n",
 912                           abstract ? sizeof(un.sun_path) - 1 :
 913                           sizeof(un.sun_path));
 914         goto err;
 915     }
 916
 917     if (pathbuf != NULL) {
 918         /*
 919          * This dummy fd usage silences the mktemp() unsecure warning.
 920          * Using mkstemp() doesn't make things more secure here
 921          * though.  bind() complains about existing files, so we have
 922          * to unlink first and thus re-open the race window.  The
 923          * worst case possible is bind() failing, i.e. a DoS attack.
 924          */
 925         fd = mkstemp(pathbuf);
 926         if (fd < 0) {
 927             error_setg_errno(errp, errno,
 928                              "Failed to make a temporary socket %s", pathbuf);
 929             goto err;
 930         }
 931         close(fd);
 932     }
 933
 934     if (!abstract && unlink(path) < 0 && errno != ENOENT) {
 935         error_setg_errno(errp, errno,
 936                          "Failed to unlink socket %s", path);
 937         goto err;
 938     }
 939
 940     memset(&un, 0, sizeof(un));
 941     un.sun_family = AF_UNIX;
 942     addrlen = sizeof(un);
 943
 944     if (abstract) {
 945         un.sun_path[0] = '\0';
 946         memcpy(&un.sun_path[1], path, pathlen);
 947         if (saddr_is_tight(saddr)) {
 948             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
 949         }
 950     } else {
 951         memcpy(un.sun_path, path, pathlen);
 952     }
 953
 954     if (bind(sock, (struct sockaddr *) &un, addrlen) < 0) {
 955         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 956         goto err;
 957     }
 958     if (listen(sock, num) < 0) {
 959         error_setg_errno(errp, errno, "Failed to listen on socket");
 960         goto err;
 961     }
 962
 963     g_free(pathbuf);
 964     return sock;
 965
 966 err:
 967     g_free(pathbuf);
 968     closesocket(sock);
 969     return -1;
 970 }
 971
 972 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 973 {
 974     bool abstract = saddr_is_abstract(saddr);
 975     struct sockaddr_un un;
 976     int sock, rc;
 977     size_t pathlen;
 978     size_t addrlen;
 979
 980     if (saddr->path == NULL) {
 981         error_setg(errp, "unix connect: no path specified");
 982         return -1;
 983     }
 984
 985     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 986     if (sock < 0) {
 987         error_setg_errno(errp, errno, "Failed to create socket");
 988         return -1;
 989     }
 990
 991     pathlen = strlen(saddr->path);
 992     if (pathlen > sizeof(un.sun_path) ||
 993         (abstract && pathlen > (sizeof(un.sun_path) - 1))) {
 994         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
 995         error_append_hint(errp, "Path must be less than %zu bytes\n",
 996                           abstract ? sizeof(un.sun_path) - 1 :
 997                           sizeof(un.sun_path));
 998         goto err;
 999     }
1000
1001     memset(&un, 0, sizeof(un));
1002     un.sun_family = AF_UNIX;
1003     addrlen = sizeof(un);
1004
1005     if (abstract) {
1006         un.sun_path[0] = '\0';
1007         memcpy(&un.sun_path[1], saddr->path, pathlen);
1008         if (saddr_is_tight(saddr)) {
1009             addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + pathlen;
1010         }
1011     } else {
1012         memcpy(un.sun_path, saddr->path, pathlen);
1013     }
1014     /* connect to peer */
1015     do {
1016         rc = 0;
1017         if (connect(sock, (struct sockaddr *) &un, addrlen) < 0) {
1018             rc = -errno;
1019         }
1020     } while (rc == -EINTR);
1021
1022     if (rc < 0) {
1023         error_setg_errno(errp, -rc, "Failed to connect to '%s'",
1024                          saddr->path);
1025         goto err;
1026     }
1027
1028     return sock;
1029
1030  err:
1031     close(sock);
1032     return -1;
1033 }
1034
1035 #else
1036
1037 static int unix_listen_saddr(UnixSocketAddress *saddr,
1038                              int num,
1039                              Error **errp)
1040 {
1041     error_setg(errp, "unix sockets are not available on windows");
1042     errno = ENOTSUP;
1043     return -1;
1044 }
1045
1046 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
1047 {
1048     error_setg(errp, "unix sockets are not available on windows");
1049     errno = ENOTSUP;
1050     return -1;
1051 }
1052 #endif
1053
1054 /* compatibility wrapper */
1055 int unix_listen(const char *str, Error **errp)
1056 {
1057     UnixSocketAddress *saddr;
1058     int sock;
1059
1060     saddr = g_new0(UnixSocketAddress, 1);
1061     saddr->path = g_strdup(str);
1062     sock = unix_listen_saddr(saddr, 1, errp);
1063     qapi_free_UnixSocketAddress(saddr);
1064     return sock;
1065 }
1066
1067 int unix_connect(const char *path, Error **errp)
1068 {
1069     UnixSocketAddress *saddr;
1070     int sock;
1071
1072     saddr = g_new0(UnixSocketAddress, 1);
1073     saddr->path = g_strdup(path);
1074     sock = unix_connect_saddr(saddr, errp);
1075     qapi_free_UnixSocketAddress(saddr);
1076     return sock;
1077 }
1078
1079
1080 SocketAddress *socket_parse(const char *str, Error **errp)
1081 {
1082     SocketAddress *addr;
1083
1084     addr = g_new0(SocketAddress, 1);
1085     if (strstart(str, "unix:", NULL)) {
1086         if (str[5] == '\0') {
1087             error_setg(errp, "invalid Unix socket address");
1088             goto fail;
1089         } else {
1090             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1091             addr->u.q_unix.path = g_strdup(str + 5);
1092         }
1093     } else if (strstart(str, "fd:", NULL)) {
1094         if (str[3] == '\0') {
1095             error_setg(errp, "invalid file descriptor address");
1096             goto fail;
1097         } else {
1098             addr->type = SOCKET_ADDRESS_TYPE_FD;
1099             addr->u.fd.str = g_strdup(str + 3);
1100         }
1101     } else if (strstart(str, "vsock:", NULL)) {
1102         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1103         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1104             goto fail;
1105         }
1106     } else {
1107         addr->type = SOCKET_ADDRESS_TYPE_INET;
1108         if (inet_parse(&addr->u.inet, str, errp)) {
1109             goto fail;
1110         }
1111     }
1112     return addr;
1113
1114 fail:
1115     qapi_free_SocketAddress(addr);
1116     return NULL;
1117 }
1118
1119 static int socket_get_fd(const char *fdstr, int num, Error **errp)
1120 {
1121     Monitor *cur_mon = monitor_cur();
1122     int fd;
1123     if (num != 1) {
1124         error_setg_errno(errp, EINVAL, "socket_get_fd: too many connections");
1125         return -1;
1126     }
1127     if (cur_mon) {
1128         fd = monitor_get_fd(cur_mon, fdstr, errp);
1129         if (fd < 0) {
1130             return -1;
1131         }
1132     } else {
1133         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1134             error_setg_errno(errp, errno,
1135                              "Unable to parse FD number %s",
1136                              fdstr);
1137             return -1;
1138         }
1139     }
1140     if (!fd_is_socket(fd)) {
1141         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1142         close(fd);
1143         return -1;
1144     }
1145     return fd;
1146 }
1147
1148 int socket_connect(SocketAddress *addr, Error **errp)
1149 {
1150     int fd;
1151
1152     switch (addr->type) {
1153     case SOCKET_ADDRESS_TYPE_INET:
1154         fd = inet_connect_saddr(&addr->u.inet, errp);
1155         break;
1156
1157     case SOCKET_ADDRESS_TYPE_UNIX:
1158         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1159         break;
1160
1161     case SOCKET_ADDRESS_TYPE_FD:
1162         fd = socket_get_fd(addr->u.fd.str, 1, errp);
1163         break;
1164
1165     case SOCKET_ADDRESS_TYPE_VSOCK:
1166         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1167         break;
1168
1169     default:
1170         abort();
1171     }
1172     return fd;
1173 }
1174
1175 int socket_listen(SocketAddress *addr, int num, Error **errp)
1176 {
1177     int fd;
1178
1179     trace_socket_listen(num);
1180     switch (addr->type) {
1181     case SOCKET_ADDRESS_TYPE_INET:
1182         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1183         break;
1184
1185     case SOCKET_ADDRESS_TYPE_UNIX:
1186         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1187         break;
1188
1189     case SOCKET_ADDRESS_TYPE_FD:
1190         fd = socket_get_fd(addr->u.fd.str, num, errp);
1191         break;
1192
1193     case SOCKET_ADDRESS_TYPE_VSOCK:
1194         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1195         break;
1196
1197     default:
1198         abort();
1199     }
1200     return fd;
1201 }
1202
1203 void socket_listen_cleanup(int fd, Error **errp)
1204 {
1205     SocketAddress *addr;
1206
1207     addr = socket_local_address(fd, errp);
1208     if (!addr) {
1209         return;
1210     }
1211
1212     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1213         && addr->u.q_unix.path) {
1214         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1215             error_setg_errno(errp, errno,
1216                              "Failed to unlink socket %s",
1217                              addr->u.q_unix.path);
1218         }
1219     }
1220
1221     qapi_free_SocketAddress(addr);
1222 }
1223
1224 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1225 {
1226     int fd;
1227
1228     /*
1229      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1230      * (although other address families can do SOCK_DGRAM, too)
1231      */
1232     switch (remote->type) {
1233     case SOCKET_ADDRESS_TYPE_INET:
1234         fd = inet_dgram_saddr(&remote->u.inet,
1235                               local ? &local->u.inet : NULL, errp);
1236         break;
1237
1238     default:
1239         error_setg(errp, "socket type unsupported for datagram");
1240         fd = -1;
1241     }
1242     return fd;
1243 }
1244
1245
1246 static SocketAddress *
1247 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1248                                 socklen_t salen,
1249                                 Error **errp)
1250 {
1251     char host[NI_MAXHOST];
1252     char serv[NI_MAXSERV];
1253     SocketAddress *addr;
1254     InetSocketAddress *inet;
1255     int ret;
1256
1257     ret = getnameinfo((struct sockaddr *)sa, salen,
1258                       host, sizeof(host),
1259                       serv, sizeof(serv),
1260                       NI_NUMERICHOST | NI_NUMERICSERV);
1261     if (ret != 0) {
1262         error_setg(errp, "Cannot format numeric socket address: %s",
1263                    gai_strerror(ret));
1264         return NULL;
1265     }
1266
1267     addr = g_new0(SocketAddress, 1);
1268     addr->type = SOCKET_ADDRESS_TYPE_INET;
1269     inet = &addr->u.inet;
1270     inet->host = g_strdup(host);
1271     inet->port = g_strdup(serv);
1272     if (sa->ss_family == AF_INET) {
1273         inet->has_ipv4 = inet->ipv4 = true;
1274     } else {
1275         inet->has_ipv6 = inet->ipv6 = true;
1276     }
1277
1278     return addr;
1279 }
1280
1281
1282 #ifndef WIN32
1283 static SocketAddress *
1284 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1285                                 socklen_t salen,
1286                                 Error **errp)
1287 {
1288     SocketAddress *addr;
1289     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1290
1291     addr = g_new0(SocketAddress, 1);
1292     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1293 #ifdef CONFIG_LINUX
1294     if (!su->sun_path[0]) {
1295         /* Linux abstract socket */
1296         addr->u.q_unix.path = g_strndup(su->sun_path + 1,
1297                                         sizeof(su->sun_path) - 1);
1298         addr->u.q_unix.has_abstract = true;
1299         addr->u.q_unix.abstract = true;
1300         addr->u.q_unix.has_tight = true;
1301         addr->u.q_unix.tight = salen < sizeof(*su);
1302         return addr;
1303     }
1304 #endif
1305
1306     addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1307     return addr;
1308 }
1309 #endif /* WIN32 */
1310
1311 #ifdef CONFIG_AF_VSOCK
1312 static SocketAddress *
1313 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1314                                  socklen_t salen,
1315                                  Error **errp)
1316 {
1317     SocketAddress *addr;
1318     VsockSocketAddress *vaddr;
1319     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1320
1321     addr = g_new0(SocketAddress, 1);
1322     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1323     vaddr = &addr->u.vsock;
1324     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1325     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1326
1327     return addr;
1328 }
1329 #endif /* CONFIG_AF_VSOCK */
1330
1331 SocketAddress *
1332 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1333                            socklen_t salen,
1334                            Error **errp)
1335 {
1336     switch (sa->ss_family) {
1337     case AF_INET:
1338     case AF_INET6:
1339         return socket_sockaddr_to_address_inet(sa, salen, errp);
1340
1341 #ifndef WIN32
1342     case AF_UNIX:
1343         return socket_sockaddr_to_address_unix(sa, salen, errp);
1344 #endif /* WIN32 */
1345
1346 #ifdef CONFIG_AF_VSOCK
1347     case AF_VSOCK:
1348         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1349 #endif
1350
1351     default:
1352         error_setg(errp, "socket family %d unsupported",
1353                    sa->ss_family);
1354         return NULL;
1355     }
1356     return 0;
1357 }
1358
1359
1360 SocketAddress *socket_local_address(int fd, Error **errp)
1361 {
1362     struct sockaddr_storage ss;
1363     socklen_t sslen = sizeof(ss);
1364
1365     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1366         error_setg_errno(errp, errno, "%s",
1367                          "Unable to query local socket address");
1368         return NULL;
1369     }
1370
1371     return socket_sockaddr_to_address(&ss, sslen, errp);
1372 }
1373
1374
1375 SocketAddress *socket_remote_address(int fd, Error **errp)
1376 {
1377     struct sockaddr_storage ss;
1378     socklen_t sslen = sizeof(ss);
1379
1380     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1381         error_setg_errno(errp, errno, "%s",
1382                          "Unable to query remote socket address");
1383         return NULL;
1384     }
1385
1386     return socket_sockaddr_to_address(&ss, sslen, errp);
1387 }
1388
1389
1390 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1391 {
1392     SocketAddress *addr;
1393
1394     if (!addr_legacy) {
1395         return NULL;
1396     }
1397
1398     addr = g_new(SocketAddress, 1);
1399
1400     switch (addr_legacy->type) {
1401     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1402         addr->type = SOCKET_ADDRESS_TYPE_INET;
1403         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1404                            addr_legacy->u.inet.data);
1405         break;
1406     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1407         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1408         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1409                            addr_legacy->u.q_unix.data);
1410         break;
1411     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1412         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1413         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1414                            addr_legacy->u.vsock.data);
1415         break;
1416     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1417         addr->type = SOCKET_ADDRESS_TYPE_FD;
1418         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1419         break;
1420     default:
1421         abort();
1422     }
1423
1424     return addr;
1425 }