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