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(struct addrinfo *addr, Error **errp);
 358
 359 static int inet_connect_addr(struct addrinfo *addr, Error **errp)
 360 {
 361     int sock, rc;
 362
 363     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 364     if (sock < 0) {
 365         error_setg_errno(errp, errno, "Failed to create socket");
 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 socket");
 380         closesocket(sock);
 381         return -1;
 382     }
 383
 384     return sock;
 385 }
 386
 387 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 388                                                  Error **errp)
 389 {
 390     struct addrinfo ai, *res;
 391     int rc;
 392     Error *err = NULL;
 393     static int useV4Mapped = 1;
 394
 395     memset(&ai, 0, sizeof(ai));
 396
 397     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 398     if (atomic_read(&useV4Mapped)) {
 399         ai.ai_flags |= AI_V4MAPPED;
 400     }
 401     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 402     ai.ai_socktype = SOCK_STREAM;
 403
 404     if (err) {
 405         error_propagate(errp, err);
 406         return NULL;
 407     }
 408
 409     if (saddr->host == NULL || saddr->port == NULL) {
 410         error_setg(errp, "host and/or port not specified");
 411         return NULL;
 412     }
 413
 414     /* lookup */
 415     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 416
 417     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 418      * then don't implement it in their getaddrinfo(). Detect
 419      * this and retry without the flag since that's preferrable
 420      * to a fatal error
 421      */
 422     if (rc == EAI_BADFLAGS &&
 423         (ai.ai_flags & AI_V4MAPPED)) {
 424         atomic_set(&useV4Mapped, 0);
 425         ai.ai_flags &= ~AI_V4MAPPED;
 426         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 427     }
 428     if (rc != 0) {
 429         error_setg(errp, "address resolution failed for %s:%s: %s",
 430                    saddr->host, saddr->port, gai_strerror(rc));
 431         return NULL;
 432     }
 433     return res;
 434 }
 435
 436 /**
 437  * Create a socket and connect it to an address.
 438  *
 439  * @saddr: Inet socket address specification
 440  * @errp: set on error
 441  *
 442  * Returns: -1 on error, file descriptor on success.
 443  */
 444 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 445 {
 446     Error *local_err = NULL;
 447     struct addrinfo *res, *e;
 448     int sock = -1;
 449
 450     res = inet_parse_connect_saddr(saddr, errp);
 451     if (!res) {
 452         return -1;
 453     }
 454
 455     for (e = res; e != NULL; e = e->ai_next) {
 456         error_free(local_err);
 457         local_err = NULL;
 458         sock = inet_connect_addr(e, &local_err);
 459         if (sock >= 0) {
 460             break;
 461         }
 462     }
 463
 464     freeaddrinfo(res);
 465
 466     if (sock < 0) {
 467         error_propagate(errp, local_err);
 468         return sock;
 469     }
 470
 471     if (saddr->keep_alive) {
 472         int val = 1;
 473         int ret = qemu_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE,
 474                                   &val, sizeof(val));
 475
 476         if (ret < 0) {
 477             error_setg_errno(errp, errno, "Unable to set KEEPALIVE");
 478             close(sock);
 479             return -1;
 480         }
 481     }
 482
 483     return sock;
 484 }
 485
 486 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 487                             InetSocketAddress *sladdr,
 488                             Error **errp)
 489 {
 490     struct addrinfo ai, *peer = NULL, *local = NULL;
 491     const char *addr;
 492     const char *port;
 493     int sock = -1, rc;
 494     Error *err = NULL;
 495
 496     /* lookup peer addr */
 497     memset(&ai,0, sizeof(ai));
 498     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 499     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 500     ai.ai_socktype = SOCK_DGRAM;
 501
 502     if (err) {
 503         error_propagate(errp, err);
 504         goto err;
 505     }
 506
 507     addr = sraddr->host;
 508     port = sraddr->port;
 509     if (addr == NULL || strlen(addr) == 0) {
 510         addr = "localhost";
 511     }
 512     if (port == NULL || strlen(port) == 0) {
 513         error_setg(errp, "remote port not specified");
 514         goto err;
 515     }
 516
 517     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 518         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 519                    gai_strerror(rc));
 520         goto err;
 521     }
 522
 523     /* lookup local addr */
 524     memset(&ai,0, sizeof(ai));
 525     ai.ai_flags = AI_PASSIVE;
 526     ai.ai_family = peer->ai_family;
 527     ai.ai_socktype = SOCK_DGRAM;
 528
 529     if (sladdr) {
 530         addr = sladdr->host;
 531         port = sladdr->port;
 532         if (addr == NULL || strlen(addr) == 0) {
 533             addr = NULL;
 534         }
 535         if (!port || strlen(port) == 0) {
 536             port = "0";
 537         }
 538     } else {
 539         addr = NULL;
 540         port = "0";
 541     }
 542
 543     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 544         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 545                    gai_strerror(rc));
 546         goto err;
 547     }
 548
 549     /* create socket */
 550     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 551     if (sock < 0) {
 552         error_setg_errno(errp, errno, "Failed to create socket");
 553         goto err;
 554     }
 555     socket_set_fast_reuse(sock);
 556
 557     /* bind socket */
 558     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 559         error_setg_errno(errp, errno, "Failed to bind socket");
 560         goto err;
 561     }
 562
 563     /* connect to peer */
 564     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 565         error_setg_errno(errp, errno, "Failed to connect socket");
 566         goto err;
 567     }
 568
 569     freeaddrinfo(local);
 570     freeaddrinfo(peer);
 571     return sock;
 572
 573 err:
 574     if (sock != -1) {
 575         closesocket(sock);
 576     }
 577     if (local) {
 578         freeaddrinfo(local);
 579     }
 580     if (peer) {
 581         freeaddrinfo(peer);
 582     }
 583
 584     return -1;
 585 }
 586
 587 /* compatibility wrapper */
 588 static int inet_parse_flag(const char *flagname, const char *optstr, bool *val,
 589                            Error **errp)
 590 {
 591     char *end;
 592     size_t len;
 593
 594     end = strstr(optstr, ",");
 595     if (end) {
 596         if (end[1] == ',') { /* Reject 'ipv6=on,,foo' */
 597             error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 598             return -1;
 599         }
 600         len = end - optstr;
 601     } else {
 602         len = strlen(optstr);
 603     }
 604     if (len == 0 || (len == 3 && strncmp(optstr, "=on", len) == 0)) {
 605         *val = true;
 606     } else if (len == 4 && strncmp(optstr, "=off", len) == 0) {
 607         *val = false;
 608     } else {
 609         error_setg(errp, "error parsing '%s' flag '%s'", flagname, optstr);
 610         return -1;
 611     }
 612     return 0;
 613 }
 614
 615 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 616 {
 617     const char *optstr, *h;
 618     char host[65];
 619     char port[33];
 620     int to;
 621     int pos;
 622     char *begin;
 623
 624     memset(addr, 0, sizeof(*addr));
 625
 626     /* parse address */
 627     if (str[0] == ':') {
 628         /* no host given */
 629         host[0] = '\0';
 630         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 631             error_setg(errp, "error parsing port in address '%s'", str);
 632             return -1;
 633         }
 634     } else if (str[0] == '[') {
 635         /* IPv6 addr */
 636         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 637             error_setg(errp, "error parsing IPv6 address '%s'", str);
 638             return -1;
 639         }
 640     } else {
 641         /* hostname or IPv4 addr */
 642         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 643             error_setg(errp, "error parsing address '%s'", str);
 644             return -1;
 645         }
 646     }
 647
 648     addr->host = g_strdup(host);
 649     addr->port = g_strdup(port);
 650
 651     /* parse options */
 652     optstr = str + pos;
 653     h = strstr(optstr, ",to=");
 654     if (h) {
 655         h += 4;
 656         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 657             (h[pos] != '\0' && h[pos] != ',')) {
 658             error_setg(errp, "error parsing to= argument");
 659             return -1;
 660         }
 661         addr->has_to = true;
 662         addr->to = to;
 663     }
 664     begin = strstr(optstr, ",ipv4");
 665     if (begin) {
 666         if (inet_parse_flag("ipv4", begin + 5, &addr->ipv4, errp) < 0) {
 667             return -1;
 668         }
 669         addr->has_ipv4 = true;
 670     }
 671     begin = strstr(optstr, ",ipv6");
 672     if (begin) {
 673         if (inet_parse_flag("ipv6", begin + 5, &addr->ipv6, errp) < 0) {
 674             return -1;
 675         }
 676         addr->has_ipv6 = true;
 677     }
 678     begin = strstr(optstr, ",keep-alive");
 679     if (begin) {
 680         if (inet_parse_flag("keep-alive", begin + strlen(",keep-alive"),
 681                             &addr->keep_alive, errp) < 0)
 682         {
 683             return -1;
 684         }
 685         addr->has_keep_alive = true;
 686     }
 687     return 0;
 688 }
 689
 690
 691 /**
 692  * Create a blocking socket and connect it to an address.
 693  *
 694  * @str: address string
 695  * @errp: set in case of an error
 696  *
 697  * Returns -1 in case of error, file descriptor on success
 698  **/
 699 int inet_connect(const char *str, Error **errp)
 700 {
 701     int sock = -1;
 702     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 703
 704     if (!inet_parse(addr, str, errp)) {
 705         sock = inet_connect_saddr(addr, errp);
 706     }
 707     qapi_free_InetSocketAddress(addr);
 708     return sock;
 709 }
 710
 711 #ifdef CONFIG_AF_VSOCK
 712 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 713                                           struct sockaddr_vm *svm,
 714                                           Error **errp)
 715 {
 716     unsigned long long val;
 717
 718     memset(svm, 0, sizeof(*svm));
 719     svm->svm_family = AF_VSOCK;
 720
 721     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 722         val > UINT32_MAX) {
 723         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 724         return false;
 725     }
 726     svm->svm_cid = val;
 727
 728     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 729         val > UINT32_MAX) {
 730         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 731         return false;
 732     }
 733     svm->svm_port = val;
 734
 735     return true;
 736 }
 737
 738 static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp)
 739 {
 740     int sock, rc;
 741
 742     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 743     if (sock < 0) {
 744         error_setg_errno(errp, errno, "Failed to create socket");
 745         return -1;
 746     }
 747
 748     /* connect to peer */
 749     do {
 750         rc = 0;
 751         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 752             rc = -errno;
 753         }
 754     } while (rc == -EINTR);
 755
 756     if (rc < 0) {
 757         error_setg_errno(errp, errno, "Failed to connect socket");
 758         closesocket(sock);
 759         return -1;
 760     }
 761
 762     return sock;
 763 }
 764
 765 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 766 {
 767     struct sockaddr_vm svm;
 768     int sock = -1;
 769
 770     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 771         return -1;
 772     }
 773
 774     sock = vsock_connect_addr(&svm, errp);
 775
 776     return sock;
 777 }
 778
 779 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 780                               int num,
 781                               Error **errp)
 782 {
 783     struct sockaddr_vm svm;
 784     int slisten;
 785
 786     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 787         return -1;
 788     }
 789
 790     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 791     if (slisten < 0) {
 792         error_setg_errno(errp, errno, "Failed to create socket");
 793         return -1;
 794     }
 795
 796     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 797         error_setg_errno(errp, errno, "Failed to bind socket");
 798         closesocket(slisten);
 799         return -1;
 800     }
 801
 802     if (listen(slisten, num) != 0) {
 803         error_setg_errno(errp, errno, "Failed to listen on socket");
 804         closesocket(slisten);
 805         return -1;
 806     }
 807     return slisten;
 808 }
 809
 810 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 811                        Error **errp)
 812 {
 813     char cid[33];
 814     char port[33];
 815     int n;
 816
 817     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 818         error_setg(errp, "error parsing address '%s'", str);
 819         return -1;
 820     }
 821     if (str[n] != '\0') {
 822         error_setg(errp, "trailing characters in address '%s'", str);
 823         return -1;
 824     }
 825
 826     addr->cid = g_strdup(cid);
 827     addr->port = g_strdup(port);
 828     return 0;
 829 }
 830 #else
 831 static void vsock_unsupported(Error **errp)
 832 {
 833     error_setg(errp, "socket family AF_VSOCK unsupported");
 834 }
 835
 836 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 837 {
 838     vsock_unsupported(errp);
 839     return -1;
 840 }
 841
 842 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 843                               int num,
 844                               Error **errp)
 845 {
 846     vsock_unsupported(errp);
 847     return -1;
 848 }
 849
 850 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 851                         Error **errp)
 852 {
 853     vsock_unsupported(errp);
 854     return -1;
 855 }
 856 #endif /* CONFIG_AF_VSOCK */
 857
 858 #ifndef _WIN32
 859
 860 static int unix_listen_saddr(UnixSocketAddress *saddr,
 861                              int num,
 862                              Error **errp)
 863 {
 864     struct sockaddr_un un;
 865     int sock, fd;
 866     char *pathbuf = NULL;
 867     const char *path;
 868     size_t pathlen;
 869
 870     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 871     if (sock < 0) {
 872         error_setg_errno(errp, errno, "Failed to create Unix socket");
 873         return -1;
 874     }
 875
 876     if (saddr->path && saddr->path[0]) {
 877         path = saddr->path;
 878     } else {
 879         const char *tmpdir = getenv("TMPDIR");
 880         tmpdir = tmpdir ? tmpdir : "/tmp";
 881         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 882     }
 883
 884     pathlen = strlen(path);
 885     if (pathlen > sizeof(un.sun_path)) {
 886         error_setg(errp, "UNIX socket path '%s' is too long", path);
 887         error_append_hint(errp, "Path must be less than %zu bytes\n",
 888                           sizeof(un.sun_path));
 889         goto err;
 890     }
 891
 892     if (pathbuf != NULL) {
 893         /*
 894          * This dummy fd usage silences the mktemp() unsecure warning.
 895          * Using mkstemp() doesn't make things more secure here
 896          * though.  bind() complains about existing files, so we have
 897          * to unlink first and thus re-open the race window.  The
 898          * worst case possible is bind() failing, i.e. a DoS attack.
 899          */
 900         fd = mkstemp(pathbuf);
 901         if (fd < 0) {
 902             error_setg_errno(errp, errno,
 903                              "Failed to make a temporary socket %s", pathbuf);
 904             goto err;
 905         }
 906         close(fd);
 907     }
 908
 909     if (unlink(path) < 0 && errno != ENOENT) {
 910         error_setg_errno(errp, errno,
 911                          "Failed to unlink socket %s", path);
 912         goto err;
 913     }
 914
 915     memset(&un, 0, sizeof(un));
 916     un.sun_family = AF_UNIX;
 917     memcpy(un.sun_path, path, pathlen);
 918
 919     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 920         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 921         goto err;
 922     }
 923     if (listen(sock, num) < 0) {
 924         error_setg_errno(errp, errno, "Failed to listen on socket");
 925         goto err;
 926     }
 927
 928     g_free(pathbuf);
 929     return sock;
 930
 931 err:
 932     g_free(pathbuf);
 933     closesocket(sock);
 934     return -1;
 935 }
 936
 937 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 938 {
 939     struct sockaddr_un un;
 940     int sock, rc;
 941     size_t pathlen;
 942
 943     if (saddr->path == NULL) {
 944         error_setg(errp, "unix connect: no path specified");
 945         return -1;
 946     }
 947
 948     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 949     if (sock < 0) {
 950         error_setg_errno(errp, errno, "Failed to create socket");
 951         return -1;
 952     }
 953
 954     pathlen = strlen(saddr->path);
 955     if (pathlen > sizeof(un.sun_path)) {
 956         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
 957         error_append_hint(errp, "Path must be less than %zu bytes\n",
 958                           sizeof(un.sun_path));
 959         goto err;
 960     }
 961
 962     memset(&un, 0, sizeof(un));
 963     un.sun_family = AF_UNIX;
 964     memcpy(un.sun_path, saddr->path, pathlen);
 965
 966     /* connect to peer */
 967     do {
 968         rc = 0;
 969         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 970             rc = -errno;
 971         }
 972     } while (rc == -EINTR);
 973
 974     if (rc < 0) {
 975         error_setg_errno(errp, -rc, "Failed to connect socket %s",
 976                          saddr->path);
 977         goto err;
 978     }
 979
 980     return sock;
 981
 982  err:
 983     close(sock);
 984     return -1;
 985 }
 986
 987 #else
 988
 989 static int unix_listen_saddr(UnixSocketAddress *saddr,
 990                              int num,
 991                              Error **errp)
 992 {
 993     error_setg(errp, "unix sockets are not available on windows");
 994     errno = ENOTSUP;
 995     return -1;
 996 }
 997
 998 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 999 {
1000     error_setg(errp, "unix sockets are not available on windows");
1001     errno = ENOTSUP;
1002     return -1;
1003 }
1004 #endif
1005
1006 /* compatibility wrapper */
1007 int unix_listen(const char *str, Error **errp)
1008 {
1009     UnixSocketAddress *saddr;
1010     int sock;
1011
1012     saddr = g_new0(UnixSocketAddress, 1);
1013     saddr->path = g_strdup(str);
1014     sock = unix_listen_saddr(saddr, 1, errp);
1015     qapi_free_UnixSocketAddress(saddr);
1016     return sock;
1017 }
1018
1019 int unix_connect(const char *path, Error **errp)
1020 {
1021     UnixSocketAddress *saddr;
1022     int sock;
1023
1024     saddr = g_new0(UnixSocketAddress, 1);
1025     saddr->path = g_strdup(path);
1026     sock = unix_connect_saddr(saddr, errp);
1027     qapi_free_UnixSocketAddress(saddr);
1028     return sock;
1029 }
1030
1031
1032 SocketAddress *socket_parse(const char *str, Error **errp)
1033 {
1034     SocketAddress *addr;
1035
1036     addr = g_new0(SocketAddress, 1);
1037     if (strstart(str, "unix:", NULL)) {
1038         if (str[5] == '\0') {
1039             error_setg(errp, "invalid Unix socket address");
1040             goto fail;
1041         } else {
1042             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1043             addr->u.q_unix.path = g_strdup(str + 5);
1044         }
1045     } else if (strstart(str, "fd:", NULL)) {
1046         if (str[3] == '\0') {
1047             error_setg(errp, "invalid file descriptor address");
1048             goto fail;
1049         } else {
1050             addr->type = SOCKET_ADDRESS_TYPE_FD;
1051             addr->u.fd.str = g_strdup(str + 3);
1052         }
1053     } else if (strstart(str, "vsock:", NULL)) {
1054         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1055         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1056             goto fail;
1057         }
1058     } else {
1059         addr->type = SOCKET_ADDRESS_TYPE_INET;
1060         if (inet_parse(&addr->u.inet, str, errp)) {
1061             goto fail;
1062         }
1063     }
1064     return addr;
1065
1066 fail:
1067     qapi_free_SocketAddress(addr);
1068     return NULL;
1069 }
1070
1071 static int socket_get_fd(const char *fdstr, int num, Error **errp)
1072 {
1073     int fd;
1074     if (num != 1) {
1075         error_setg_errno(errp, EINVAL, "socket_get_fd: too many connections");
1076         return -1;
1077     }
1078     if (cur_mon) {
1079         fd = monitor_get_fd(cur_mon, fdstr, errp);
1080         if (fd < 0) {
1081             return -1;
1082         }
1083     } else {
1084         if (qemu_strtoi(fdstr, NULL, 10, &fd) < 0) {
1085             error_setg_errno(errp, errno,
1086                              "Unable to parse FD number %s",
1087                              fdstr);
1088             return -1;
1089         }
1090     }
1091     if (!fd_is_socket(fd)) {
1092         error_setg(errp, "File descriptor '%s' is not a socket", fdstr);
1093         close(fd);
1094         return -1;
1095     }
1096     return fd;
1097 }
1098
1099 int socket_connect(SocketAddress *addr, Error **errp)
1100 {
1101     int fd;
1102
1103     switch (addr->type) {
1104     case SOCKET_ADDRESS_TYPE_INET:
1105         fd = inet_connect_saddr(&addr->u.inet, errp);
1106         break;
1107
1108     case SOCKET_ADDRESS_TYPE_UNIX:
1109         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1110         break;
1111
1112     case SOCKET_ADDRESS_TYPE_FD:
1113         fd = socket_get_fd(addr->u.fd.str, 1, errp);
1114         break;
1115
1116     case SOCKET_ADDRESS_TYPE_VSOCK:
1117         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1118         break;
1119
1120     default:
1121         abort();
1122     }
1123     return fd;
1124 }
1125
1126 int socket_listen(SocketAddress *addr, int num, Error **errp)
1127 {
1128     int fd;
1129
1130     trace_socket_listen(num);
1131     switch (addr->type) {
1132     case SOCKET_ADDRESS_TYPE_INET:
1133         fd = inet_listen_saddr(&addr->u.inet, 0, num, errp);
1134         break;
1135
1136     case SOCKET_ADDRESS_TYPE_UNIX:
1137         fd = unix_listen_saddr(&addr->u.q_unix, num, errp);
1138         break;
1139
1140     case SOCKET_ADDRESS_TYPE_FD:
1141         fd = socket_get_fd(addr->u.fd.str, num, errp);
1142         break;
1143
1144     case SOCKET_ADDRESS_TYPE_VSOCK:
1145         fd = vsock_listen_saddr(&addr->u.vsock, num, errp);
1146         break;
1147
1148     default:
1149         abort();
1150     }
1151     return fd;
1152 }
1153
1154 void socket_listen_cleanup(int fd, Error **errp)
1155 {
1156     SocketAddress *addr;
1157
1158     addr = socket_local_address(fd, errp);
1159     if (!addr) {
1160         return;
1161     }
1162
1163     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1164         && addr->u.q_unix.path) {
1165         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1166             error_setg_errno(errp, errno,
1167                              "Failed to unlink socket %s",
1168                              addr->u.q_unix.path);
1169         }
1170     }
1171
1172     qapi_free_SocketAddress(addr);
1173 }
1174
1175 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1176 {
1177     int fd;
1178
1179     /*
1180      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1181      * (although other address families can do SOCK_DGRAM, too)
1182      */
1183     switch (remote->type) {
1184     case SOCKET_ADDRESS_TYPE_INET:
1185         fd = inet_dgram_saddr(&remote->u.inet,
1186                               local ? &local->u.inet : NULL, errp);
1187         break;
1188
1189     default:
1190         error_setg(errp, "socket type unsupported for datagram");
1191         fd = -1;
1192     }
1193     return fd;
1194 }
1195
1196
1197 static SocketAddress *
1198 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1199                                 socklen_t salen,
1200                                 Error **errp)
1201 {
1202     char host[NI_MAXHOST];
1203     char serv[NI_MAXSERV];
1204     SocketAddress *addr;
1205     InetSocketAddress *inet;
1206     int ret;
1207
1208     ret = getnameinfo((struct sockaddr *)sa, salen,
1209                       host, sizeof(host),
1210                       serv, sizeof(serv),
1211                       NI_NUMERICHOST | NI_NUMERICSERV);
1212     if (ret != 0) {
1213         error_setg(errp, "Cannot format numeric socket address: %s",
1214                    gai_strerror(ret));
1215         return NULL;
1216     }
1217
1218     addr = g_new0(SocketAddress, 1);
1219     addr->type = SOCKET_ADDRESS_TYPE_INET;
1220     inet = &addr->u.inet;
1221     inet->host = g_strdup(host);
1222     inet->port = g_strdup(serv);
1223     if (sa->ss_family == AF_INET) {
1224         inet->has_ipv4 = inet->ipv4 = true;
1225     } else {
1226         inet->has_ipv6 = inet->ipv6 = true;
1227     }
1228
1229     return addr;
1230 }
1231
1232
1233 #ifndef WIN32
1234 static SocketAddress *
1235 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1236                                 socklen_t salen,
1237                                 Error **errp)
1238 {
1239     SocketAddress *addr;
1240     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1241
1242     addr = g_new0(SocketAddress, 1);
1243     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1244     if (su->sun_path[0]) {
1245         addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1246     }
1247
1248     return addr;
1249 }
1250 #endif /* WIN32 */
1251
1252 #ifdef CONFIG_AF_VSOCK
1253 static SocketAddress *
1254 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1255                                  socklen_t salen,
1256                                  Error **errp)
1257 {
1258     SocketAddress *addr;
1259     VsockSocketAddress *vaddr;
1260     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1261
1262     addr = g_new0(SocketAddress, 1);
1263     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1264     vaddr = &addr->u.vsock;
1265     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1266     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1267
1268     return addr;
1269 }
1270 #endif /* CONFIG_AF_VSOCK */
1271
1272 SocketAddress *
1273 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1274                            socklen_t salen,
1275                            Error **errp)
1276 {
1277     switch (sa->ss_family) {
1278     case AF_INET:
1279     case AF_INET6:
1280         return socket_sockaddr_to_address_inet(sa, salen, errp);
1281
1282 #ifndef WIN32
1283     case AF_UNIX:
1284         return socket_sockaddr_to_address_unix(sa, salen, errp);
1285 #endif /* WIN32 */
1286
1287 #ifdef CONFIG_AF_VSOCK
1288     case AF_VSOCK:
1289         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1290 #endif
1291
1292     default:
1293         error_setg(errp, "socket family %d unsupported",
1294                    sa->ss_family);
1295         return NULL;
1296     }
1297     return 0;
1298 }
1299
1300
1301 SocketAddress *socket_local_address(int fd, Error **errp)
1302 {
1303     struct sockaddr_storage ss;
1304     socklen_t sslen = sizeof(ss);
1305
1306     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1307         error_setg_errno(errp, errno, "%s",
1308                          "Unable to query local socket address");
1309         return NULL;
1310     }
1311
1312     return socket_sockaddr_to_address(&ss, sslen, errp);
1313 }
1314
1315
1316 SocketAddress *socket_remote_address(int fd, Error **errp)
1317 {
1318     struct sockaddr_storage ss;
1319     socklen_t sslen = sizeof(ss);
1320
1321     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1322         error_setg_errno(errp, errno, "%s",
1323                          "Unable to query remote socket address");
1324         return NULL;
1325     }
1326
1327     return socket_sockaddr_to_address(&ss, sslen, errp);
1328 }
1329
1330
1331 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1332 {
1333     SocketAddress *addr;
1334
1335     if (!addr_legacy) {
1336         return NULL;
1337     }
1338
1339     addr = g_new(SocketAddress, 1);
1340
1341     switch (addr_legacy->type) {
1342     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1343         addr->type = SOCKET_ADDRESS_TYPE_INET;
1344         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1345                            addr_legacy->u.inet.data);
1346         break;
1347     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1348         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1349         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1350                            addr_legacy->u.q_unix.data);
1351         break;
1352     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1353         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1354         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1355                            addr_legacy->u.vsock.data);
1356         break;
1357     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1358         addr->type = SOCKET_ADDRESS_TYPE_FD;
1359         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1360         break;
1361     default:
1362         abort();
1363     }
1364
1365     return addr;
1366 }