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
  34 #ifndef AI_ADDRCONFIG
  35 # define AI_ADDRCONFIG 0
  36 #endif
  37
  38 #ifndef AI_V4MAPPED
  39 # define AI_V4MAPPED 0
  40 #endif
  41
  42 #ifndef AI_NUMERICSERV
  43 # define AI_NUMERICSERV 0
  44 #endif
  45
  46
  47 static int inet_getport(struct addrinfo *e)
  48 {
  49     struct sockaddr_in *i4;
  50     struct sockaddr_in6 *i6;
  51
  52     switch (e->ai_family) {
  53     case PF_INET6:
  54         i6 = (void*)e->ai_addr;
  55         return ntohs(i6->sin6_port);
  56     case PF_INET:
  57         i4 = (void*)e->ai_addr;
  58         return ntohs(i4->sin_port);
  59     default:
  60         return 0;
  61     }
  62 }
  63
  64 static void inet_setport(struct addrinfo *e, int port)
  65 {
  66     struct sockaddr_in *i4;
  67     struct sockaddr_in6 *i6;
  68
  69     switch (e->ai_family) {
  70     case PF_INET6:
  71         i6 = (void*)e->ai_addr;
  72         i6->sin6_port = htons(port);
  73         break;
  74     case PF_INET:
  75         i4 = (void*)e->ai_addr;
  76         i4->sin_port = htons(port);
  77         break;
  78     }
  79 }
  80
  81 NetworkAddressFamily inet_netfamily(int family)
  82 {
  83     switch (family) {
  84     case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
  85     case PF_INET:  return NETWORK_ADDRESS_FAMILY_IPV4;
  86     case PF_UNIX:  return NETWORK_ADDRESS_FAMILY_UNIX;
  87 #ifdef CONFIG_AF_VSOCK
  88     case PF_VSOCK: return NETWORK_ADDRESS_FAMILY_VSOCK;
  89 #endif /* CONFIG_AF_VSOCK */
  90     }
  91     return NETWORK_ADDRESS_FAMILY_UNKNOWN;
  92 }
  93
  94 bool fd_is_socket(int fd)
  95 {
  96     int optval;
  97     socklen_t optlen = sizeof(optval);
  98     return !qemu_getsockopt(fd, SOL_SOCKET, SO_TYPE, &optval, &optlen);
  99 }
 100
 101
 102 /*
 103  * Matrix we're trying to apply
 104  *
 105  *  ipv4  ipv6   family
 106  *   -     -       PF_UNSPEC
 107  *   -     f       PF_INET
 108  *   -     t       PF_INET6
 109  *   f     -       PF_INET6
 110  *   f     f       <error>
 111  *   f     t       PF_INET6
 112  *   t     -       PF_INET
 113  *   t     f       PF_INET
 114  *   t     t       PF_INET6/PF_UNSPEC
 115  *
 116  * NB, this matrix is only about getting the necessary results
 117  * from getaddrinfo(). Some of the cases require further work
 118  * after reading results from getaddrinfo in order to fully
 119  * apply the logic the end user wants.
 120  *
 121  * In the first and last cases, we must set IPV6_V6ONLY=0
 122  * when binding, to allow a single listener to potentially
 123  * accept both IPv4+6 addresses.
 124  */
 125 int inet_ai_family_from_address(InetSocketAddress *addr,
 126                                 Error **errp)
 127 {
 128     if (addr->has_ipv6 && addr->has_ipv4 &&
 129         !addr->ipv6 && !addr->ipv4) {
 130         error_setg(errp, "Cannot disable IPv4 and IPv6 at same time");
 131         return PF_UNSPEC;
 132     }
 133     if ((addr->has_ipv6 && addr->ipv6) && (addr->has_ipv4 && addr->ipv4)) {
 134         /*
 135          * Some backends can only do a single listener. In that case
 136          * we want empty hostname to resolve to "::" and then use the
 137          * flag IPV6_V6ONLY==0 to get both protocols on 1 socket. This
 138          * doesn't work for addresses other than "", so they're just
 139          * inevitably broken until multiple listeners can be used,
 140          * and thus we honour getaddrinfo automatic protocol detection
 141          * Once all backends do multi-listener, remove the PF_INET6
 142          * branch entirely.
 143          */
 144         if (!addr->host || g_str_equal(addr->host, "")) {
 145             return PF_INET6;
 146         } else {
 147             return PF_UNSPEC;
 148         }
 149     }
 150     if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) {
 151         return PF_INET6;
 152     }
 153     if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) {
 154         return PF_INET;
 155     }
 156     return PF_UNSPEC;
 157 }
 158
 159 static int create_fast_reuse_socket(struct addrinfo *e)
 160 {
 161     int slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 162     if (slisten < 0) {
 163         return -1;
 164     }
 165     socket_set_fast_reuse(slisten);
 166     return slisten;
 167 }
 168
 169 static int try_bind(int socket, InetSocketAddress *saddr, struct addrinfo *e)
 170 {
 171 #ifndef IPV6_V6ONLY
 172     return bind(socket, e->ai_addr, e->ai_addrlen);
 173 #else
 174     /*
 175      * Deals with first & last cases in matrix in comment
 176      * for inet_ai_family_from_address().
 177      */
 178     int v6only =
 179         ((!saddr->has_ipv4 && !saddr->has_ipv6) ||
 180          (saddr->has_ipv4 && saddr->ipv4 &&
 181           saddr->has_ipv6 && saddr->ipv6)) ? 0 : 1;
 182     int stat;
 183
 184  rebind:
 185     if (e->ai_family == PF_INET6) {
 186         qemu_setsockopt(socket, IPPROTO_IPV6, IPV6_V6ONLY, &v6only,
 187                         sizeof(v6only));
 188     }
 189
 190     stat = bind(socket, e->ai_addr, e->ai_addrlen);
 191     if (!stat) {
 192         return 0;
 193     }
 194
 195     /* If we got EADDRINUSE from an IPv6 bind & v6only is unset,
 196      * it could be that the IPv4 port is already claimed, so retry
 197      * with v6only set
 198      */
 199     if (e->ai_family == PF_INET6 && errno == EADDRINUSE && !v6only) {
 200         v6only = 1;
 201         goto rebind;
 202     }
 203     return stat;
 204 #endif
 205 }
 206
 207 static int inet_listen_saddr(InetSocketAddress *saddr,
 208                              int port_offset,
 209                              Error **errp)
 210 {
 211     struct addrinfo ai,*res,*e;
 212     char port[33];
 213     char uaddr[INET6_ADDRSTRLEN+1];
 214     char uport[33];
 215     int rc, port_min, port_max, p;
 216     int slisten = -1;
 217     int saved_errno = 0;
 218     bool socket_created = false;
 219     Error *err = NULL;
 220
 221     memset(&ai,0, sizeof(ai));
 222     ai.ai_flags = AI_PASSIVE;
 223     if (saddr->has_numeric && saddr->numeric) {
 224         ai.ai_flags |= AI_NUMERICHOST | AI_NUMERICSERV;
 225     }
 226     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 227     ai.ai_socktype = SOCK_STREAM;
 228
 229     if (err) {
 230         error_propagate(errp, err);
 231         return -1;
 232     }
 233
 234     if (saddr->host == NULL) {
 235         error_setg(errp, "host not specified");
 236         return -1;
 237     }
 238     if (saddr->port != NULL) {
 239         pstrcpy(port, sizeof(port), saddr->port);
 240     } else {
 241         port[0] = '\0';
 242     }
 243
 244     /* lookup */
 245     if (port_offset) {
 246         unsigned long long baseport;
 247         if (strlen(port) == 0) {
 248             error_setg(errp, "port not specified");
 249             return -1;
 250         }
 251         if (parse_uint_full(port, &baseport, 10) < 0) {
 252             error_setg(errp, "can't convert to a number: %s", port);
 253             return -1;
 254         }
 255         if (baseport > 65535 ||
 256             baseport + port_offset > 65535) {
 257             error_setg(errp, "port %s out of range", port);
 258             return -1;
 259         }
 260         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 261     }
 262     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 263                      strlen(port) ? port : NULL, &ai, &res);
 264     if (rc != 0) {
 265         error_setg(errp, "address resolution failed for %s:%s: %s",
 266                    saddr->host, port, gai_strerror(rc));
 267         return -1;
 268     }
 269
 270     /* create socket + bind/listen */
 271     for (e = res; e != NULL; e = e->ai_next) {
 272         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 273                         uaddr,INET6_ADDRSTRLEN,uport,32,
 274                         NI_NUMERICHOST | NI_NUMERICSERV);
 275
 276         port_min = inet_getport(e);
 277         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 278         for (p = port_min; p <= port_max; p++) {
 279             inet_setport(e, p);
 280
 281             slisten = create_fast_reuse_socket(e);
 282             if (slisten < 0) {
 283                 /* First time we expect we might fail to create the socket
 284                  * eg if 'e' has AF_INET6 but ipv6 kmod is not loaded.
 285                  * Later iterations should always succeed if first iteration
 286                  * worked though, so treat that as fatal.
 287                  */
 288                 if (p == port_min) {
 289                     continue;
 290                 } else {
 291                     error_setg_errno(errp, errno,
 292                                      "Failed to recreate failed listening socket");
 293                     goto listen_failed;
 294                 }
 295             }
 296             socket_created = true;
 297
 298             rc = try_bind(slisten, saddr, e);
 299             if (rc < 0) {
 300                 if (errno != EADDRINUSE) {
 301                     error_setg_errno(errp, errno, "Failed to bind socket");
 302                     goto listen_failed;
 303                 }
 304             } else {
 305                 if (!listen(slisten, 1)) {
 306                     goto listen_ok;
 307                 }
 308                 if (errno != EADDRINUSE) {
 309                     error_setg_errno(errp, errno, "Failed to listen on socket");
 310                     goto listen_failed;
 311                 }
 312             }
 313             /* Someone else managed to bind to the same port and beat us
 314              * to listen on it! Socket semantics does not allow us to
 315              * recover from this situation, so we need to recreate the
 316              * socket to allow bind attempts for subsequent ports:
 317              */
 318             closesocket(slisten);
 319             slisten = -1;
 320         }
 321     }
 322     error_setg_errno(errp, errno,
 323                      socket_created ?
 324                      "Failed to find an available port" :
 325                      "Failed to create a socket");
 326 listen_failed:
 327     saved_errno = errno;
 328     if (slisten >= 0) {
 329         closesocket(slisten);
 330     }
 331     freeaddrinfo(res);
 332     errno = saved_errno;
 333     return -1;
 334
 335 listen_ok:
 336     freeaddrinfo(res);
 337     return slisten;
 338 }
 339
 340 #ifdef _WIN32
 341 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 342     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 343 #else
 344 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 345     ((rc) == -EINPROGRESS)
 346 #endif
 347
 348 static int inet_connect_addr(struct addrinfo *addr, Error **errp);
 349
 350 static int inet_connect_addr(struct addrinfo *addr, Error **errp)
 351 {
 352     int sock, rc;
 353
 354     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 355     if (sock < 0) {
 356         error_setg_errno(errp, errno, "Failed to create socket");
 357         return -1;
 358     }
 359     socket_set_fast_reuse(sock);
 360
 361     /* connect to peer */
 362     do {
 363         rc = 0;
 364         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 365             rc = -errno;
 366         }
 367     } while (rc == -EINTR);
 368
 369     if (rc < 0) {
 370         error_setg_errno(errp, errno, "Failed to connect socket");
 371         closesocket(sock);
 372         return -1;
 373     }
 374
 375     return sock;
 376 }
 377
 378 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 379                                                  Error **errp)
 380 {
 381     struct addrinfo ai, *res;
 382     int rc;
 383     Error *err = NULL;
 384     static int useV4Mapped = 1;
 385
 386     memset(&ai, 0, sizeof(ai));
 387
 388     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 389     if (atomic_read(&useV4Mapped)) {
 390         ai.ai_flags |= AI_V4MAPPED;
 391     }
 392     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 393     ai.ai_socktype = SOCK_STREAM;
 394
 395     if (err) {
 396         error_propagate(errp, err);
 397         return NULL;
 398     }
 399
 400     if (saddr->host == NULL || saddr->port == NULL) {
 401         error_setg(errp, "host and/or port not specified");
 402         return NULL;
 403     }
 404
 405     /* lookup */
 406     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 407
 408     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 409      * then don't implement it in their getaddrinfo(). Detect
 410      * this and retry without the flag since that's preferrable
 411      * to a fatal error
 412      */
 413     if (rc == EAI_BADFLAGS &&
 414         (ai.ai_flags & AI_V4MAPPED)) {
 415         atomic_set(&useV4Mapped, 0);
 416         ai.ai_flags &= ~AI_V4MAPPED;
 417         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 418     }
 419     if (rc != 0) {
 420         error_setg(errp, "address resolution failed for %s:%s: %s",
 421                    saddr->host, saddr->port, gai_strerror(rc));
 422         return NULL;
 423     }
 424     return res;
 425 }
 426
 427 /**
 428  * Create a socket and connect it to an address.
 429  *
 430  * @saddr: Inet socket address specification
 431  * @errp: set on error
 432  *
 433  * Returns: -1 on error, file descriptor on success.
 434  */
 435 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 436 {
 437     Error *local_err = NULL;
 438     struct addrinfo *res, *e;
 439     int sock = -1;
 440
 441     res = inet_parse_connect_saddr(saddr, errp);
 442     if (!res) {
 443         return -1;
 444     }
 445
 446     for (e = res; e != NULL; e = e->ai_next) {
 447         error_free(local_err);
 448         local_err = NULL;
 449         sock = inet_connect_addr(e, &local_err);
 450         if (sock >= 0) {
 451             break;
 452         }
 453     }
 454
 455     if (sock < 0) {
 456         error_propagate(errp, local_err);
 457     }
 458
 459     freeaddrinfo(res);
 460     return sock;
 461 }
 462
 463 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 464                             InetSocketAddress *sladdr,
 465                             Error **errp)
 466 {
 467     struct addrinfo ai, *peer = NULL, *local = NULL;
 468     const char *addr;
 469     const char *port;
 470     int sock = -1, rc;
 471     Error *err = NULL;
 472
 473     /* lookup peer addr */
 474     memset(&ai,0, sizeof(ai));
 475     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 476     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 477     ai.ai_socktype = SOCK_DGRAM;
 478
 479     if (err) {
 480         error_propagate(errp, err);
 481         goto err;
 482     }
 483
 484     addr = sraddr->host;
 485     port = sraddr->port;
 486     if (addr == NULL || strlen(addr) == 0) {
 487         addr = "localhost";
 488     }
 489     if (port == NULL || strlen(port) == 0) {
 490         error_setg(errp, "remote port not specified");
 491         goto err;
 492     }
 493
 494     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 495         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 496                    gai_strerror(rc));
 497         goto err;
 498     }
 499
 500     /* lookup local addr */
 501     memset(&ai,0, sizeof(ai));
 502     ai.ai_flags = AI_PASSIVE;
 503     ai.ai_family = peer->ai_family;
 504     ai.ai_socktype = SOCK_DGRAM;
 505
 506     if (sladdr) {
 507         addr = sladdr->host;
 508         port = sladdr->port;
 509         if (addr == NULL || strlen(addr) == 0) {
 510             addr = NULL;
 511         }
 512         if (!port || strlen(port) == 0) {
 513             port = "0";
 514         }
 515     } else {
 516         addr = NULL;
 517         port = "0";
 518     }
 519
 520     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 521         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 522                    gai_strerror(rc));
 523         goto err;
 524     }
 525
 526     /* create socket */
 527     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 528     if (sock < 0) {
 529         error_setg_errno(errp, errno, "Failed to create socket");
 530         goto err;
 531     }
 532     socket_set_fast_reuse(sock);
 533
 534     /* bind socket */
 535     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 536         error_setg_errno(errp, errno, "Failed to bind socket");
 537         goto err;
 538     }
 539
 540     /* connect to peer */
 541     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 542         error_setg_errno(errp, errno, "Failed to connect socket");
 543         goto err;
 544     }
 545
 546     freeaddrinfo(local);
 547     freeaddrinfo(peer);
 548     return sock;
 549
 550 err:
 551     if (sock != -1) {
 552         closesocket(sock);
 553     }
 554     if (local) {
 555         freeaddrinfo(local);
 556     }
 557     if (peer) {
 558         freeaddrinfo(peer);
 559     }
 560
 561     return -1;
 562 }
 563
 564 /* compatibility wrapper */
 565 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 566                            Error **errp)
 567 {
 568     char *end;
 569     size_t len;
 570
 571     end = strstr(optstr, ",");
 572     if (end) {
 573         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 574             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 575             return -1;
 576         }
 577         len = end - optstr;
 578     } else {
 579         len = strlen(optstr);
 580     }
 581     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 582         *val = true;
 583     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 584         *val = false;
 585     } else {
 586         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 587         return -1;
 588     }
 589     return 0;
 590 }
 591
 592 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 593 {
 594     const char *optstr, *h;
 595     char host[65];
 596     char port[33];
 597     int to;
 598     int pos;
 599     char *begin;
 600
 601     memset(addr, 0, sizeof(*addr));
 602
 603     /* parse address */
 604     if (str[0] == ':') {
 605         /* no host given */
 606         host[0] = '\0';
 607         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 608             error_setg(errp, "error parsing port in address '%s'", str);
 609             return -1;
 610         }
 611     } else if (str[0] == '[') {
 612         /* IPv6 addr */
 613         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 614             error_setg(errp, "error parsing IPv6 address '%s'", str);
 615             return -1;
 616         }
 617     } else {
 618         /* hostname or IPv4 addr */
 619         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 620             error_setg(errp, "error parsing address '%s'", str);
 621             return -1;
 622         }
 623     }
 624
 625     addr->host = g_strdup(host);
 626     addr->port = g_strdup(port);
 627
 628     /* parse options */
 629     optstr = str + pos;
 630     h = strstr(optstr, ",to=");
 631     if (h) {
 632         h += 4;
 633         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 634             (h[pos] != '\0' && h[pos] != ',')) {
 635             error_setg(errp, "error parsing to= argument");
 636             return -1;
 637         }
 638         addr->has_to = true;
 639         addr->to = to;
 640     }
 641     begin = strstr(optstr, ",ipv4");
 642     if (begin) {
 643         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 644             return -1;
 645         }
 646         addr->has_ipv4 = true;
 647     }
 648     begin = strstr(optstr, ",ipv6");
 649     if (begin) {
 650         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 651             return -1;
 652         }
 653         addr->has_ipv6 = true;
 654     }
 655     return 0;
 656 }
 657
 658
 659 /**
 660  * Create a blocking socket and connect it to an address.
 661  *
 662  * @str: address string
 663  * @errp: set in case of an error
 664  *
 665  * Returns -1 in case of error, file descriptor on success
 666  **/
 667 int inet_connect(const char *str, Error **errp)
 668 {
 669     int sock = -1;
 670     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 671
 672     if (!inet_parse(addr, str, errp)) {
 673         sock = inet_connect_saddr(addr, errp);
 674     }
 675     qapi_free_InetSocketAddress(addr);
 676     return sock;
 677 }
 678
 679 #ifdef CONFIG_AF_VSOCK
 680 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 681                                           struct sockaddr_vm *svm,
 682                                           Error **errp)
 683 {
 684     unsigned long long val;
 685
 686     memset(svm, 0, sizeof(*svm));
 687     svm->svm_family = AF_VSOCK;
 688
 689     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 690         val > UINT32_MAX) {
 691         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 692         return false;
 693     }
 694     svm->svm_cid = val;
 695
 696     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 697         val > UINT32_MAX) {
 698         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 699         return false;
 700     }
 701     svm->svm_port = val;
 702
 703     return true;
 704 }
 705
 706 static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp)
 707 {
 708     int sock, rc;
 709
 710     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 711     if (sock < 0) {
 712         error_setg_errno(errp, errno, "Failed to create socket");
 713         return -1;
 714     }
 715
 716     /* connect to peer */
 717     do {
 718         rc = 0;
 719         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 720             rc = -errno;
 721         }
 722     } while (rc == -EINTR);
 723
 724     if (rc < 0) {
 725         error_setg_errno(errp, errno, "Failed to connect socket");
 726         closesocket(sock);
 727         return -1;
 728     }
 729
 730     return sock;
 731 }
 732
 733 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 734 {
 735     struct sockaddr_vm svm;
 736     int sock = -1;
 737
 738     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 739         return -1;
 740     }
 741
 742     sock = vsock_connect_addr(&svm, errp);
 743
 744     return sock;
 745 }
 746
 747 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 748                               Error **errp)
 749 {
 750     struct sockaddr_vm svm;
 751     int slisten;
 752
 753     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 754         return -1;
 755     }
 756
 757     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 758     if (slisten < 0) {
 759         error_setg_errno(errp, errno, "Failed to create socket");
 760         return -1;
 761     }
 762
 763     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 764         error_setg_errno(errp, errno, "Failed to bind socket");
 765         closesocket(slisten);
 766         return -1;
 767     }
 768
 769     if (listen(slisten, 1) != 0) {
 770         error_setg_errno(errp, errno, "Failed to listen on socket");
 771         closesocket(slisten);
 772         return -1;
 773     }
 774     return slisten;
 775 }
 776
 777 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 778                        Error **errp)
 779 {
 780     char cid[33];
 781     char port[33];
 782     int n;
 783
 784     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 785         error_setg(errp, "error parsing address '%s'", str);
 786         return -1;
 787     }
 788     if (str[n] != '\0') {
 789         error_setg(errp, "trailing characters in address '%s'", str);
 790         return -1;
 791     }
 792
 793     addr->cid = g_strdup(cid);
 794     addr->port = g_strdup(port);
 795     return 0;
 796 }
 797 #else
 798 static void vsock_unsupported(Error **errp)
 799 {
 800     error_setg(errp, "socket family AF_VSOCK unsupported");
 801 }
 802
 803 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 804 {
 805     vsock_unsupported(errp);
 806     return -1;
 807 }
 808
 809 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 810                               Error **errp)
 811 {
 812     vsock_unsupported(errp);
 813     return -1;
 814 }
 815
 816 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 817                         Error **errp)
 818 {
 819     vsock_unsupported(errp);
 820     return -1;
 821 }
 822 #endif /* CONFIG_AF_VSOCK */
 823
 824 #ifndef _WIN32
 825
 826 static int unix_listen_saddr(UnixSocketAddress *saddr,
 827                              Error **errp)
 828 {
 829     struct sockaddr_un un;
 830     int sock, fd;
 831     char *pathbuf = NULL;
 832     const char *path;
 833     size_t pathlen;
 834
 835     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 836     if (sock < 0) {
 837         error_setg_errno(errp, errno, "Failed to create Unix socket");
 838         return -1;
 839     }
 840
 841     if (saddr->path && saddr->path[0]) {
 842         path = saddr->path;
 843     } else {
 844         const char *tmpdir = getenv("TMPDIR");
 845         tmpdir = tmpdir ? tmpdir : "/tmp";
 846         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 847     }
 848
 849     pathlen = strlen(path);
 850     if (pathlen > sizeof(un.sun_path)) {
 851         error_setg(errp, "UNIX socket path '%s' is too long", path);
 852         error_append_hint(errp, "Path must be less than %zu bytes\n",
 853                           sizeof(un.sun_path));
 854         goto err;
 855     }
 856
 857     if (pathbuf != NULL) {
 858         /*
 859          * This dummy fd usage silences the mktemp() unsecure warning.
 860          * Using mkstemp() doesn't make things more secure here
 861          * though.  bind() complains about existing files, so we have
 862          * to unlink first and thus re-open the race window.  The
 863          * worst case possible is bind() failing, i.e. a DoS attack.
 864          */
 865         fd = mkstemp(pathbuf);
 866         if (fd < 0) {
 867             error_setg_errno(errp, errno,
 868                              "Failed to make a temporary socket %s", pathbuf);
 869             goto err;
 870         }
 871         close(fd);
 872     }
 873
 874     if (unlink(path) < 0 && errno != ENOENT) {
 875         error_setg_errno(errp, errno,
 876                          "Failed to unlink socket %s", path);
 877         goto err;
 878     }
 879
 880     memset(&un, 0, sizeof(un));
 881     un.sun_family = AF_UNIX;
 882     memcpy(un.sun_path, path, pathlen);
 883
 884     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 885         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 886         goto err;
 887     }
 888     if (listen(sock, 1) < 0) {
 889         error_setg_errno(errp, errno, "Failed to listen on socket");
 890         goto err;
 891     }
 892
 893     g_free(pathbuf);
 894     return sock;
 895
 896 err:
 897     g_free(pathbuf);
 898     closesocket(sock);
 899     return -1;
 900 }
 901
 902 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 903 {
 904     struct sockaddr_un un;
 905     int sock, rc;
 906     size_t pathlen;
 907
 908     if (saddr->path == NULL) {
 909         error_setg(errp, "unix connect: no path specified");
 910         return -1;
 911     }
 912
 913     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 914     if (sock < 0) {
 915         error_setg_errno(errp, errno, "Failed to create socket");
 916         return -1;
 917     }
 918
 919     pathlen = strlen(saddr->path);
 920     if (pathlen > sizeof(un.sun_path)) {
 921         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
 922         error_append_hint(errp, "Path must be less than %zu bytes\n",
 923                           sizeof(un.sun_path));
 924         goto err;
 925     }
 926
 927     memset(&un, 0, sizeof(un));
 928     un.sun_family = AF_UNIX;
 929     memcpy(un.sun_path, saddr->path, pathlen);
 930
 931     /* connect to peer */
 932     do {
 933         rc = 0;
 934         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 935             rc = -errno;
 936         }
 937     } while (rc == -EINTR);
 938
 939     if (rc < 0) {
 940         error_setg_errno(errp, -rc, "Failed to connect socket %s",
 941                          saddr->path);
 942         goto err;
 943     }
 944
 945     return sock;
 946
 947  err:
 948     close(sock);
 949     return -1;
 950 }
 951
 952 #else
 953
 954 static int unix_listen_saddr(UnixSocketAddress *saddr,
 955                              Error **errp)
 956 {
 957     error_setg(errp, "unix sockets are not available on windows");
 958     errno = ENOTSUP;
 959     return -1;
 960 }
 961
 962 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 963 {
 964     error_setg(errp, "unix sockets are not available on windows");
 965     errno = ENOTSUP;
 966     return -1;
 967 }
 968 #endif
 969
 970 /* compatibility wrapper */
 971 int unix_listen(const char *str, Error **errp)
 972 {
 973     UnixSocketAddress *saddr;
 974     int sock;
 975
 976     saddr = g_new0(UnixSocketAddress, 1);
 977     saddr->path = g_strdup(str);
 978     sock = unix_listen_saddr(saddr, errp);
 979     qapi_free_UnixSocketAddress(saddr);
 980     return sock;
 981 }
 982
 983 int unix_connect(const char *path, Error **errp)
 984 {
 985     UnixSocketAddress *saddr;
 986     int sock;
 987
 988     saddr = g_new0(UnixSocketAddress, 1);
 989     saddr->path = g_strdup(path);
 990     sock = unix_connect_saddr(saddr, errp);
 991     qapi_free_UnixSocketAddress(saddr);
 992     return sock;
 993 }
 994
 995
 996 SocketAddress *socket_parse(const char *str, Error **errp)
 997 {
 998     SocketAddress *addr;
 999
1000     addr = g_new0(SocketAddress, 1);
1001     if (strstart(str, "unix:", NULL)) {
1002         if (str[5] == '\0') {
1003             error_setg(errp, "invalid Unix socket address");
1004             goto fail;
1005         } else {
1006             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1007             addr->u.q_unix.path = g_strdup(str + 5);
1008         }
1009     } else if (strstart(str, "fd:", NULL)) {
1010         if (str[3] == '\0') {
1011             error_setg(errp, "invalid file descriptor address");
1012             goto fail;
1013         } else {
1014             addr->type = SOCKET_ADDRESS_TYPE_FD;
1015             addr->u.fd.str = g_strdup(str + 3);
1016         }
1017     } else if (strstart(str, "vsock:", NULL)) {
1018         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1019         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1020             goto fail;
1021         }
1022     } else {
1023         addr->type = SOCKET_ADDRESS_TYPE_INET;
1024         if (inet_parse(&addr->u.inet, str, errp)) {
1025             goto fail;
1026         }
1027     }
1028     return addr;
1029
1030 fail:
1031     qapi_free_SocketAddress(addr);
1032     return NULL;
1033 }
1034
1035 static int socket_get_fd(const char *fdstr, Error **errp)
1036 {
1037     int fd;
1038     if (cur_mon) {
1039         fd = monitor_get_fd(cur_mon, fdstr, errp);
1040         if (fd < 0) {
1041             return -1;
1042         }
1043     } else {
1044         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1045             error_setg_errno(errp, errno,
1046                              "Unable to parse FD number %s",
1047                              fdstr);
1048             return -1;
1049         }
1050     }
1051     if (!fd_is_socket(fd)) {
1052         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1053         close(fd);
1054         return -1;
1055     }
1056     return fd;
1057 }
1058
1059 int socket_connect(SocketAddress *addr, Error **errp)
1060 {
1061     int fd;
1062
1063     switch (addr->type) {
1064     case SOCKET_ADDRESS_TYPE_INET:
1065         fd = inet_connect_saddr(&addr->u.inet, errp);
1066         break;
1067
1068     case SOCKET_ADDRESS_TYPE_UNIX:
1069         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1070         break;
1071
1072     case SOCKET_ADDRESS_TYPE_FD:
1073         fd = socket_get_fd(addr->u.fd.str, errp);
1074         break;
1075
1076     case SOCKET_ADDRESS_TYPE_VSOCK:
1077         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1078         break;
1079
1080     default:
1081         abort();
1082     }
1083     return fd;
1084 }
1085
1086 int socket_listen(SocketAddress *addr, Error **errp)
1087 {
1088     int fd;
1089
1090     switch (addr->type) {
1091     case SOCKET_ADDRESS_TYPE_INET:
1092         fd = inet_listen_saddr(&addr->u.inet, 0, errp);
1093         break;
1094
1095     case SOCKET_ADDRESS_TYPE_UNIX:
1096         fd = unix_listen_saddr(&addr->u.q_unix, errp);
1097         break;
1098
1099     case SOCKET_ADDRESS_TYPE_FD:
1100         fd = socket_get_fd(addr->u.fd.str, errp);
1101         break;
1102
1103     case SOCKET_ADDRESS_TYPE_VSOCK:
1104         fd = vsock_listen_saddr(&addr->u.vsock, errp);
1105         break;
1106
1107     default:
1108         abort();
1109     }
1110     return fd;
1111 }
1112
1113 void socket_listen_cleanup(int fd, Error **errp)
1114 {
1115     SocketAddress *addr;
1116
1117     addr = socket_local_address(fd, errp);
1118     if (!addr) {
1119         return;
1120     }
1121
1122     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1123         && addr->u.q_unix.path) {
1124         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1125             error_setg_errno(errp, errno,
1126                              "Failed to unlink socket %s",
1127                              addr->u.q_unix.path);
1128         }
1129     }
1130
1131     qapi_free_SocketAddress(addr);
1132 }
1133
1134 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1135 {
1136     int fd;
1137
1138     /*
1139      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1140      * (although other address families can do SOCK_DGRAM, too)
1141      */
1142     switch (remote->type) {
1143     case SOCKET_ADDRESS_TYPE_INET:
1144         fd = inet_dgram_saddr(&remote->u.inet,
1145                               local ? &local->u.inet : NULL, errp);
1146         break;
1147
1148     default:
1149         error_setg(errp, "socket type unsupported for datagram");
1150         fd = -1;
1151     }
1152     return fd;
1153 }
1154
1155
1156 static SocketAddress *
1157 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1158                                 socklen_t salen,
1159                                 Error **errp)
1160 {
1161     char host[NI_MAXHOST];
1162     char serv[NI_MAXSERV];
1163     SocketAddress *addr;
1164     InetSocketAddress *inet;
1165     int ret;
1166
1167     ret = getnameinfo((struct sockaddr *)sa, salen,
1168                       host, sizeof(host),
1169                       serv, sizeof(serv),
1170                       NI_NUMERICHOST | NI_NUMERICSERV);
1171     if (ret != 0) {
1172         error_setg(errp, "Cannot format numeric socket address: %s",
1173                    gai_strerror(ret));
1174         return NULL;
1175     }
1176
1177     addr = g_new0(SocketAddress, 1);
1178     addr->type = SOCKET_ADDRESS_TYPE_INET;
1179     inet = &addr->u.inet;
1180     inet->host = g_strdup(host);
1181     inet->port = g_strdup(serv);
1182     if (sa->ss_family == AF_INET) {
1183         inet->has_ipv4 = inet->ipv4 = true;
1184     } else {
1185         inet->has_ipv6 = inet->ipv6 = true;
1186     }
1187
1188     return addr;
1189 }
1190
1191
1192 #ifndef WIN32
1193 static SocketAddress *
1194 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1195                                 socklen_t salen,
1196                                 Error **errp)
1197 {
1198     SocketAddress *addr;
1199     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1200
1201     addr = g_new0(SocketAddress, 1);
1202     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1203     if (su->sun_path[0]) {
1204         addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1205     }
1206
1207     return addr;
1208 }
1209 #endif /* WIN32 */
1210
1211 #ifdef CONFIG_AF_VSOCK
1212 static SocketAddress *
1213 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1214                                  socklen_t salen,
1215                                  Error **errp)
1216 {
1217     SocketAddress *addr;
1218     VsockSocketAddress *vaddr;
1219     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1220
1221     addr = g_new0(SocketAddress, 1);
1222     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1223     vaddr = &addr->u.vsock;
1224     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1225     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1226
1227     return addr;
1228 }
1229 #endif /* CONFIG_AF_VSOCK */
1230
1231 SocketAddress *
1232 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1233                            socklen_t salen,
1234                            Error **errp)
1235 {
1236     switch (sa->ss_family) {
1237     case AF_INET:
1238     case AF_INET6:
1239         return socket_sockaddr_to_address_inet(sa, salen, errp);
1240
1241 #ifndef WIN32
1242     case AF_UNIX:
1243         return socket_sockaddr_to_address_unix(sa, salen, errp);
1244 #endif /* WIN32 */
1245
1246 #ifdef CONFIG_AF_VSOCK
1247     case AF_VSOCK:
1248         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1249 #endif
1250
1251     default:
1252         error_setg(errp, "socket family %d unsupported",
1253                    sa->ss_family);
1254         return NULL;
1255     }
1256     return 0;
1257 }
1258
1259
1260 SocketAddress *socket_local_address(int fd, Error **errp)
1261 {
1262     struct sockaddr_storage ss;
1263     socklen_t sslen = sizeof(ss);
1264
1265     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1266         error_setg_errno(errp, errno, "%s",
1267                          "Unable to query local socket address");
1268         return NULL;
1269     }
1270
1271     return socket_sockaddr_to_address(&ss, sslen, errp);
1272 }
1273
1274
1275 SocketAddress *socket_remote_address(int fd, Error **errp)
1276 {
1277     struct sockaddr_storage ss;
1278     socklen_t sslen = sizeof(ss);
1279
1280     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1281         error_setg_errno(errp, errno, "%s",
1282                          "Unable to query remote socket address");
1283         return NULL;
1284     }
1285
1286     return socket_sockaddr_to_address(&ss, sslen, errp);
1287 }
1288
1289
1290 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1291 {
1292     SocketAddress *addr;
1293
1294     if (!addr_legacy) {
1295         return NULL;
1296     }
1297
1298     addr = g_new(SocketAddress, 1);
1299
1300     switch (addr_legacy->type) {
1301     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1302         addr->type = SOCKET_ADDRESS_TYPE_INET;
1303         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1304                            addr_legacy->u.inet.data);
1305         break;
1306     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1307         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1308         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1309                            addr_legacy->u.q_unix.data);
1310         break;
1311     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1312         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1313         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1314                            addr_legacy->u.vsock.data);
1315         break;
1316     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1317         addr->type = SOCKET_ADDRESS_TYPE_FD;
1318         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1319         break;
1320     default:
1321         abort();
1322     }
1323
1324     return addr;
1325 }