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 = 0;
 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         slisten = create_fast_reuse_socket(e);
 271         if (slisten < 0) {
 272             continue;
 273         }
 274
 275         socket_created = true;
 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             rc = try_bind(slisten, saddr, e);
 281             if (rc) {
 282                 if (errno == EADDRINUSE) {
 283                     continue;
 284                 } else {
 285                     error_setg_errno(errp, errno, "Failed to bind socket");
 286                     goto listen_failed;
 287                 }
 288             }
 289             if (!listen(slisten, 1)) {
 290                 goto listen_ok;
 291             }
 292             if (errno != EADDRINUSE) {
 293                 error_setg_errno(errp, errno, "Failed to listen on socket");
 294                 goto listen_failed;
 295             }
 296             /* Someone else managed to bind to the same port and beat us
 297              * to listen on it! Socket semantics does not allow us to
 298              * recover from this situation, so we need to recreate the
 299              * socket to allow bind attempts for subsequent ports:
 300              */
 301             closesocket(slisten);
 302             slisten = create_fast_reuse_socket(e);
 303             if (slisten < 0) {
 304                 error_setg_errno(errp, errno,
 305                                  "Failed to recreate failed listening socket");
 306                 goto listen_failed;
 307             }
 308         }
 309     }
 310     error_setg_errno(errp, errno,
 311                      socket_created ?
 312                      "Failed to find an available port" :
 313                      "Failed to create a socket");
 314 listen_failed:
 315     saved_errno = errno;
 316     if (slisten >= 0) {
 317         closesocket(slisten);
 318     }
 319     freeaddrinfo(res);
 320     errno = saved_errno;
 321     return -1;
 322
 323 listen_ok:
 324     if (update_addr) {
 325         g_free(saddr->host);
 326         saddr->host = g_strdup(uaddr);
 327         g_free(saddr->port);
 328         saddr->port = g_strdup_printf("%d",
 329                                       inet_getport(e) - port_offset);
 330         saddr->has_ipv6 = saddr->ipv6 = e->ai_family == PF_INET6;
 331         saddr->has_ipv4 = saddr->ipv4 = e->ai_family != PF_INET6;
 332     }
 333     freeaddrinfo(res);
 334     return slisten;
 335 }
 336
 337 #ifdef _WIN32
 338 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 339     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 340 #else
 341 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 342     ((rc) == -EINPROGRESS)
 343 #endif
 344
 345 static int inet_connect_addr(struct addrinfo *addr, Error **errp);
 346
 347 static int inet_connect_addr(struct addrinfo *addr, Error **errp)
 348 {
 349     int sock, rc;
 350
 351     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 352     if (sock < 0) {
 353         error_setg_errno(errp, errno, "Failed to create socket");
 354         return -1;
 355     }
 356     socket_set_fast_reuse(sock);
 357
 358     /* connect to peer */
 359     do {
 360         rc = 0;
 361         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 362             rc = -errno;
 363         }
 364     } while (rc == -EINTR);
 365
 366     if (rc < 0) {
 367         error_setg_errno(errp, errno, "Failed to connect socket");
 368         closesocket(sock);
 369         return -1;
 370     }
 371
 372     return sock;
 373 }
 374
 375 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 376                                                  Error **errp)
 377 {
 378     struct addrinfo ai, *res;
 379     int rc;
 380     Error *err = NULL;
 381     static int useV4Mapped = 1;
 382
 383     memset(&ai, 0, sizeof(ai));
 384
 385     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 386     if (atomic_read(&useV4Mapped)) {
 387         ai.ai_flags |= AI_V4MAPPED;
 388     }
 389     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 390     ai.ai_socktype = SOCK_STREAM;
 391
 392     if (err) {
 393         error_propagate(errp, err);
 394         return NULL;
 395     }
 396
 397     if (saddr->host == NULL || saddr->port == NULL) {
 398         error_setg(errp, "host and/or port not specified");
 399         return NULL;
 400     }
 401
 402     /* lookup */
 403     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 404
 405     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 406      * then don't implement it in their getaddrinfo(). Detect
 407      * this and retry without the flag since that's preferrable
 408      * to a fatal error
 409      */
 410     if (rc == EAI_BADFLAGS &&
 411         (ai.ai_flags & AI_V4MAPPED)) {
 412         atomic_set(&useV4Mapped, 0);
 413         ai.ai_flags &= ~AI_V4MAPPED;
 414         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 415     }
 416     if (rc != 0) {
 417         error_setg(errp, "address resolution failed for %s:%s: %s",
 418                    saddr->host, saddr->port, gai_strerror(rc));
 419         return NULL;
 420     }
 421     return res;
 422 }
 423
 424 /**
 425  * Create a socket and connect it to an address.
 426  *
 427  * @saddr: Inet socket address specification
 428  * @errp: set on error
 429  *
 430  * Returns: -1 on error, file descriptor on success.
 431  */
 432 int inet_connect_saddr(InetSocketAddress *saddr, Error **errp)
 433 {
 434     Error *local_err = NULL;
 435     struct addrinfo *res, *e;
 436     int sock = -1;
 437
 438     res = inet_parse_connect_saddr(saddr, errp);
 439     if (!res) {
 440         return -1;
 441     }
 442
 443     for (e = res; e != NULL; e = e->ai_next) {
 444         error_free(local_err);
 445         local_err = NULL;
 446         sock = inet_connect_addr(e, &local_err);
 447         if (sock >= 0) {
 448             break;
 449         }
 450     }
 451
 452     if (sock < 0) {
 453         error_propagate(errp, local_err);
 454     }
 455
 456     freeaddrinfo(res);
 457     return sock;
 458 }
 459
 460 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 461                             InetSocketAddress *sladdr,
 462                             Error **errp)
 463 {
 464     struct addrinfo ai, *peer = NULL, *local = NULL;
 465     const char *addr;
 466     const char *port;
 467     int sock = -1, rc;
 468     Error *err = NULL;
 469
 470     /* lookup peer addr */
 471     memset(&ai,0, sizeof(ai));
 472     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 473     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 474     ai.ai_socktype = SOCK_DGRAM;
 475
 476     if (err) {
 477         error_propagate(errp, err);
 478         goto err;
 479     }
 480
 481     addr = sraddr->host;
 482     port = sraddr->port;
 483     if (addr == NULL || strlen(addr) == 0) {
 484         addr = "localhost";
 485     }
 486     if (port == NULL || strlen(port) == 0) {
 487         error_setg(errp, "remote port not specified");
 488         goto err;
 489     }
 490
 491     if ((rc = getaddrinfo(addr, port, &ai, &peer)) != 0) {
 492         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 493                    gai_strerror(rc));
 494         goto err;
 495     }
 496
 497     /* lookup local addr */
 498     memset(&ai,0, sizeof(ai));
 499     ai.ai_flags = AI_PASSIVE;
 500     ai.ai_family = peer->ai_family;
 501     ai.ai_socktype = SOCK_DGRAM;
 502
 503     if (sladdr) {
 504         addr = sladdr->host;
 505         port = sladdr->port;
 506         if (addr == NULL || strlen(addr) == 0) {
 507             addr = NULL;
 508         }
 509         if (!port || strlen(port) == 0) {
 510             port = "0";
 511         }
 512     } else {
 513         addr = NULL;
 514         port = "0";
 515     }
 516
 517     if ((rc = getaddrinfo(addr, port, &ai, &local)) != 0) {
 518         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 519                    gai_strerror(rc));
 520         goto err;
 521     }
 522
 523     /* create socket */
 524     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 525     if (sock < 0) {
 526         error_setg_errno(errp, errno, "Failed to create socket");
 527         goto err;
 528     }
 529     socket_set_fast_reuse(sock);
 530
 531     /* bind socket */
 532     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 533         error_setg_errno(errp, errno, "Failed to bind socket");
 534         goto err;
 535     }
 536
 537     /* connect to peer */
 538     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 539         error_setg_errno(errp, errno, "Failed to connect socket");
 540         goto err;
 541     }
 542
 543     freeaddrinfo(local);
 544     freeaddrinfo(peer);
 545     return sock;
 546
 547 err:
 548     if (sock != -1) {
 549         closesocket(sock);
 550     }
 551     if (local) {
 552         freeaddrinfo(local);
 553     }
 554     if (peer) {
 555         freeaddrinfo(peer);
 556     }
 557
 558     return -1;
 559 }
 560
 561 /* compatibility wrapper */
 562 int inet_parse(InetSocketAddress *addr, const char *str, Error **errp)
 563 {
 564     const char *optstr, *h;
 565     char host[65];
 566     char port[33];
 567     int to;
 568     int pos;
 569
 570     memset(addr, 0, sizeof(*addr));
 571
 572     /* parse address */
 573     if (str[0] == ':') {
 574         /* no host given */
 575         host[0] = '\0';
 576         if (sscanf(str, ":%32[^,]%n", port, &pos) != 1) {
 577             error_setg(errp, "error parsing port in address '%s'", str);
 578             return -1;
 579         }
 580     } else if (str[0] == '[') {
 581         /* IPv6 addr */
 582         if (sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos) != 2) {
 583             error_setg(errp, "error parsing IPv6 address '%s'", str);
 584             return -1;
 585         }
 586     } else {
 587         /* hostname or IPv4 addr */
 588         if (sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos) != 2) {
 589             error_setg(errp, "error parsing address '%s'", str);
 590             return -1;
 591         }
 592     }
 593
 594     addr->host = g_strdup(host);
 595     addr->port = g_strdup(port);
 596
 597     /* parse options */
 598     optstr = str + pos;
 599     h = strstr(optstr, ",to=");
 600     if (h) {
 601         h += 4;
 602         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 603             (h[pos] != '\0' && h[pos] != ',')) {
 604             error_setg(errp, "error parsing to= argument");
 605             return -1;
 606         }
 607         addr->has_to = true;
 608         addr->to = to;
 609     }
 610     if (strstr(optstr, ",ipv4")) {
 611         addr->ipv4 = addr->has_ipv4 = true;
 612     }
 613     if (strstr(optstr, ",ipv6")) {
 614         addr->ipv6 = addr->has_ipv6 = true;
 615     }
 616     return 0;
 617 }
 618
 619
 620 /**
 621  * Create a blocking socket and connect it to an address.
 622  *
 623  * @str: address string
 624  * @errp: set in case of an error
 625  *
 626  * Returns -1 in case of error, file descriptor on success
 627  **/
 628 int inet_connect(const char *str, Error **errp)
 629 {
 630     int sock = -1;
 631     InetSocketAddress *addr = g_new(InetSocketAddress, 1);
 632
 633     if (!inet_parse(addr, str, errp)) {
 634         sock = inet_connect_saddr(addr, errp);
 635     }
 636     qapi_free_InetSocketAddress(addr);
 637     return sock;
 638 }
 639
 640 #ifdef CONFIG_AF_VSOCK
 641 static bool vsock_parse_vaddr_to_sockaddr(const VsockSocketAddress *vaddr,
 642                                           struct sockaddr_vm *svm,
 643                                           Error **errp)
 644 {
 645     unsigned long long val;
 646
 647     memset(svm, 0, sizeof(*svm));
 648     svm->svm_family = AF_VSOCK;
 649
 650     if (parse_uint_full(vaddr->cid, &val, 10) < 0 ||
 651         val > UINT32_MAX) {
 652         error_setg(errp, "Failed to parse cid '%s'", vaddr->cid);
 653         return false;
 654     }
 655     svm->svm_cid = val;
 656
 657     if (parse_uint_full(vaddr->port, &val, 10) < 0 ||
 658         val > UINT32_MAX) {
 659         error_setg(errp, "Failed to parse port '%s'", vaddr->port);
 660         return false;
 661     }
 662     svm->svm_port = val;
 663
 664     return true;
 665 }
 666
 667 static int vsock_connect_addr(const struct sockaddr_vm *svm, Error **errp)
 668 {
 669     int sock, rc;
 670
 671     sock = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 672     if (sock < 0) {
 673         error_setg_errno(errp, errno, "Failed to create socket");
 674         return -1;
 675     }
 676
 677     /* connect to peer */
 678     do {
 679         rc = 0;
 680         if (connect(sock, (const struct sockaddr *)svm, sizeof(*svm)) < 0) {
 681             rc = -errno;
 682         }
 683     } while (rc == -EINTR);
 684
 685     if (rc < 0) {
 686         error_setg_errno(errp, errno, "Failed to connect socket");
 687         closesocket(sock);
 688         return -1;
 689     }
 690
 691     return sock;
 692 }
 693
 694 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 695 {
 696     struct sockaddr_vm svm;
 697     int sock = -1;
 698
 699     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 700         return -1;
 701     }
 702
 703     sock = vsock_connect_addr(&svm, errp);
 704
 705     return sock;
 706 }
 707
 708 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 709                               Error **errp)
 710 {
 711     struct sockaddr_vm svm;
 712     int slisten;
 713
 714     if (!vsock_parse_vaddr_to_sockaddr(vaddr, &svm, errp)) {
 715         return -1;
 716     }
 717
 718     slisten = qemu_socket(AF_VSOCK, SOCK_STREAM, 0);
 719     if (slisten < 0) {
 720         error_setg_errno(errp, errno, "Failed to create socket");
 721         return -1;
 722     }
 723
 724     if (bind(slisten, (const struct sockaddr *)&svm, sizeof(svm)) != 0) {
 725         error_setg_errno(errp, errno, "Failed to bind socket");
 726         closesocket(slisten);
 727         return -1;
 728     }
 729
 730     if (listen(slisten, 1) != 0) {
 731         error_setg_errno(errp, errno, "Failed to listen on socket");
 732         closesocket(slisten);
 733         return -1;
 734     }
 735     return slisten;
 736 }
 737
 738 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 739                        Error **errp)
 740 {
 741     char cid[33];
 742     char port[33];
 743     int n;
 744
 745     if (sscanf(str, "%32[^:]:%32[^,]%n", cid, port, &n) != 2) {
 746         error_setg(errp, "error parsing address '%s'", str);
 747         return -1;
 748     }
 749     if (str[n] != '\0') {
 750         error_setg(errp, "trailing characters in address '%s'", str);
 751         return -1;
 752     }
 753
 754     addr->cid = g_strdup(cid);
 755     addr->port = g_strdup(port);
 756     return 0;
 757 }
 758 #else
 759 static void vsock_unsupported(Error **errp)
 760 {
 761     error_setg(errp, "socket family AF_VSOCK unsupported");
 762 }
 763
 764 static int vsock_connect_saddr(VsockSocketAddress *vaddr, Error **errp)
 765 {
 766     vsock_unsupported(errp);
 767     return -1;
 768 }
 769
 770 static int vsock_listen_saddr(VsockSocketAddress *vaddr,
 771                               Error **errp)
 772 {
 773     vsock_unsupported(errp);
 774     return -1;
 775 }
 776
 777 static int vsock_parse(VsockSocketAddress *addr, const char *str,
 778                         Error **errp)
 779 {
 780     vsock_unsupported(errp);
 781     return -1;
 782 }
 783 #endif /* CONFIG_AF_VSOCK */
 784
 785 #ifndef _WIN32
 786
 787 static int unix_listen_saddr(UnixSocketAddress *saddr,
 788                              bool update_addr,
 789                              Error **errp)
 790 {
 791     struct sockaddr_un un;
 792     int sock, fd;
 793     char *pathbuf = NULL;
 794     const char *path;
 795
 796     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 797     if (sock < 0) {
 798         error_setg_errno(errp, errno, "Failed to create Unix socket");
 799         return -1;
 800     }
 801
 802     if (saddr->path && saddr->path[0]) {
 803         path = saddr->path;
 804     } else {
 805         const char *tmpdir = getenv("TMPDIR");
 806         tmpdir = tmpdir ? tmpdir : "/tmp";
 807         path = pathbuf = g_strdup_printf("%s/qemu-socket-XXXXXX", tmpdir);
 808     }
 809
 810     if (strlen(path) > sizeof(un.sun_path)) {
 811         error_setg(errp, "UNIX socket path '%s' is too long", path);
 812         error_append_hint(errp, "Path must be less than %zu bytes\n",
 813                           sizeof(un.sun_path));
 814         goto err;
 815     }
 816
 817     if (pathbuf != NULL) {
 818         /*
 819          * This dummy fd usage silences the mktemp() unsecure warning.
 820          * Using mkstemp() doesn't make things more secure here
 821          * though.  bind() complains about existing files, so we have
 822          * to unlink first and thus re-open the race window.  The
 823          * worst case possible is bind() failing, i.e. a DoS attack.
 824          */
 825         fd = mkstemp(pathbuf);
 826         if (fd < 0) {
 827             error_setg_errno(errp, errno,
 828                              "Failed to make a temporary socket %s", pathbuf);
 829             goto err;
 830         }
 831         close(fd);
 832     }
 833
 834     if (unlink(path) < 0 && errno != ENOENT) {
 835         error_setg_errno(errp, errno,
 836                          "Failed to unlink socket %s", path);
 837         goto err;
 838     }
 839
 840     memset(&un, 0, sizeof(un));
 841     un.sun_family = AF_UNIX;
 842     strncpy(un.sun_path, path, sizeof(un.sun_path));
 843
 844     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 845         error_setg_errno(errp, errno, "Failed to bind socket to %s", path);
 846         goto err;
 847     }
 848     if (listen(sock, 1) < 0) {
 849         error_setg_errno(errp, errno, "Failed to listen on socket");
 850         goto err;
 851     }
 852
 853     if (update_addr && pathbuf) {
 854         g_free(saddr->path);
 855         saddr->path = pathbuf;
 856     } else {
 857         g_free(pathbuf);
 858     }
 859     return sock;
 860
 861 err:
 862     g_free(pathbuf);
 863     closesocket(sock);
 864     return -1;
 865 }
 866
 867 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 868 {
 869     struct sockaddr_un un;
 870     int sock, rc;
 871
 872     if (saddr->path == NULL) {
 873         error_setg(errp, "unix connect: no path specified");
 874         return -1;
 875     }
 876
 877     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 878     if (sock < 0) {
 879         error_setg_errno(errp, errno, "Failed to create socket");
 880         return -1;
 881     }
 882
 883     if (strlen(saddr->path) > sizeof(un.sun_path)) {
 884         error_setg(errp, "UNIX socket path '%s' is too long", saddr->path);
 885         error_append_hint(errp, "Path must be less than %zu bytes\n",
 886                           sizeof(un.sun_path));
 887         goto err;
 888     }
 889
 890     memset(&un, 0, sizeof(un));
 891     un.sun_family = AF_UNIX;
 892     strncpy(un.sun_path, saddr->path, sizeof(un.sun_path));
 893
 894     /* connect to peer */
 895     do {
 896         rc = 0;
 897         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 898             rc = -errno;
 899         }
 900     } while (rc == -EINTR);
 901
 902     if (rc < 0) {
 903         error_setg_errno(errp, -rc, "Failed to connect socket %s",
 904                          saddr->path);
 905         goto err;
 906     }
 907
 908     return sock;
 909
 910  err:
 911     close(sock);
 912     return -1;
 913 }
 914
 915 #else
 916
 917 static int unix_listen_saddr(UnixSocketAddress *saddr,
 918                              bool update_addr,
 919                              Error **errp)
 920 {
 921     error_setg(errp, "unix sockets are not available on windows");
 922     errno = ENOTSUP;
 923     return -1;
 924 }
 925
 926 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp)
 927 {
 928     error_setg(errp, "unix sockets are not available on windows");
 929     errno = ENOTSUP;
 930     return -1;
 931 }
 932 #endif
 933
 934 /* compatibility wrapper */
 935 int unix_listen(const char *str, char *ostr, int olen, Error **errp)
 936 {
 937     char *path, *optstr;
 938     int sock, len;
 939     UnixSocketAddress *saddr;
 940
 941     saddr = g_new0(UnixSocketAddress, 1);
 942
 943     optstr = strchr(str, ',');
 944     if (optstr) {
 945         len = optstr - str;
 946         if (len) {
 947             path = g_malloc(len+1);
 948             snprintf(path, len+1, "%.*s", len, str);
 949             saddr->path = path;
 950         }
 951     } else {
 952         saddr->path = g_strdup(str);
 953     }
 954
 955     sock = unix_listen_saddr(saddr, true, errp);
 956
 957     if (sock != -1 && ostr) {
 958         snprintf(ostr, olen, "%s%s", saddr->path, optstr ? optstr : "");
 959     }
 960
 961     qapi_free_UnixSocketAddress(saddr);
 962     return sock;
 963 }
 964
 965 int unix_connect(const char *path, Error **errp)
 966 {
 967     UnixSocketAddress *saddr;
 968     int sock;
 969
 970     saddr = g_new0(UnixSocketAddress, 1);
 971     saddr->path = g_strdup(path);
 972     sock = unix_connect_saddr(saddr, errp);
 973     qapi_free_UnixSocketAddress(saddr);
 974     return sock;
 975 }
 976
 977
 978 SocketAddress *socket_parse(const char *str, Error **errp)
 979 {
 980     SocketAddress *addr;
 981
 982     addr = g_new0(SocketAddress, 1);
 983     if (strstart(str, "unix:", NULL)) {
 984         if (str[5] == '\0') {
 985             error_setg(errp, "invalid Unix socket address");
 986             goto fail;
 987         } else {
 988             addr->type = SOCKET_ADDRESS_TYPE_UNIX;
 989             addr->u.q_unix.path = g_strdup(str + 5);
 990         }
 991     } else if (strstart(str, "fd:", NULL)) {
 992         if (str[3] == '\0') {
 993             error_setg(errp, "invalid file descriptor address");
 994             goto fail;
 995         } else {
 996             addr->type = SOCKET_ADDRESS_TYPE_FD;
 997             addr->u.fd.str = g_strdup(str + 3);
 998         }
 999     } else if (strstart(str, "vsock:", NULL)) {
1000         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1001         if (vsock_parse(&addr->u.vsock, str + strlen("vsock:"), errp)) {
1002             goto fail;
1003         }
1004     } else {
1005         addr->type = SOCKET_ADDRESS_TYPE_INET;
1006         if (inet_parse(&addr->u.inet, str, errp)) {
1007             goto fail;
1008         }
1009     }
1010     return addr;
1011
1012 fail:
1013     qapi_free_SocketAddress(addr);
1014     return NULL;
1015 }
1016
1017 int socket_connect(SocketAddress *addr, Error **errp)
1018 {
1019     int fd;
1020
1021     switch (addr->type) {
1022     case SOCKET_ADDRESS_TYPE_INET:
1023         fd = inet_connect_saddr(&addr->u.inet, errp);
1024         break;
1025
1026     case SOCKET_ADDRESS_TYPE_UNIX:
1027         fd = unix_connect_saddr(&addr->u.q_unix, errp);
1028         break;
1029
1030     case SOCKET_ADDRESS_TYPE_FD:
1031         fd = monitor_get_fd(cur_mon, addr->u.fd.str, errp);
1032         break;
1033
1034     case SOCKET_ADDRESS_TYPE_VSOCK:
1035         fd = vsock_connect_saddr(&addr->u.vsock, errp);
1036         break;
1037
1038     default:
1039         abort();
1040     }
1041     return fd;
1042 }
1043
1044 int socket_listen(SocketAddress *addr, Error **errp)
1045 {
1046     int fd;
1047
1048     switch (addr->type) {
1049     case SOCKET_ADDRESS_TYPE_INET:
1050         fd = inet_listen_saddr(&addr->u.inet, 0, false, errp);
1051         break;
1052
1053     case SOCKET_ADDRESS_TYPE_UNIX:
1054         fd = unix_listen_saddr(&addr->u.q_unix, false, errp);
1055         break;
1056
1057     case SOCKET_ADDRESS_TYPE_FD:
1058         fd = monitor_get_fd(cur_mon, addr->u.fd.str, errp);
1059         break;
1060
1061     case SOCKET_ADDRESS_TYPE_VSOCK:
1062         fd = vsock_listen_saddr(&addr->u.vsock, errp);
1063         break;
1064
1065     default:
1066         abort();
1067     }
1068     return fd;
1069 }
1070
1071 void socket_listen_cleanup(int fd, Error **errp)
1072 {
1073     SocketAddress *addr;
1074
1075     addr = socket_local_address(fd, errp);
1076
1077     if (addr->type == SOCKET_ADDRESS_TYPE_UNIX
1078         && addr->u.q_unix.path) {
1079         if (unlink(addr->u.q_unix.path) < 0 && errno != ENOENT) {
1080             error_setg_errno(errp, errno,
1081                              "Failed to unlink socket %s",
1082                              addr->u.q_unix.path);
1083         }
1084     }
1085
1086     qapi_free_SocketAddress(addr);
1087 }
1088
1089 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1090 {
1091     int fd;
1092
1093     /*
1094      * TODO SOCKET_ADDRESS_TYPE_FD when fd is AF_INET or AF_INET6
1095      * (although other address families can do SOCK_DGRAM, too)
1096      */
1097     switch (remote->type) {
1098     case SOCKET_ADDRESS_TYPE_INET:
1099         fd = inet_dgram_saddr(&remote->u.inet,
1100                               local ? &local->u.inet : NULL, errp);
1101         break;
1102
1103     default:
1104         error_setg(errp, "socket type unsupported for datagram");
1105         fd = -1;
1106     }
1107     return fd;
1108 }
1109
1110
1111 static SocketAddress *
1112 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1113                                 socklen_t salen,
1114                                 Error **errp)
1115 {
1116     char host[NI_MAXHOST];
1117     char serv[NI_MAXSERV];
1118     SocketAddress *addr;
1119     InetSocketAddress *inet;
1120     int ret;
1121
1122     ret = getnameinfo((struct sockaddr *)sa, salen,
1123                       host, sizeof(host),
1124                       serv, sizeof(serv),
1125                       NI_NUMERICHOST | NI_NUMERICSERV);
1126     if (ret != 0) {
1127         error_setg(errp, "Cannot format numeric socket address: %s",
1128                    gai_strerror(ret));
1129         return NULL;
1130     }
1131
1132     addr = g_new0(SocketAddress, 1);
1133     addr->type = SOCKET_ADDRESS_TYPE_INET;
1134     inet = &addr->u.inet;
1135     inet->host = g_strdup(host);
1136     inet->port = g_strdup(serv);
1137     if (sa->ss_family == AF_INET) {
1138         inet->has_ipv4 = inet->ipv4 = true;
1139     } else {
1140         inet->has_ipv6 = inet->ipv6 = true;
1141     }
1142
1143     return addr;
1144 }
1145
1146
1147 #ifndef WIN32
1148 static SocketAddress *
1149 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1150                                 socklen_t salen,
1151                                 Error **errp)
1152 {
1153     SocketAddress *addr;
1154     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1155
1156     addr = g_new0(SocketAddress, 1);
1157     addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1158     if (su->sun_path[0]) {
1159         addr->u.q_unix.path = g_strndup(su->sun_path, sizeof(su->sun_path));
1160     }
1161
1162     return addr;
1163 }
1164 #endif /* WIN32 */
1165
1166 #ifdef CONFIG_AF_VSOCK
1167 static SocketAddress *
1168 socket_sockaddr_to_address_vsock(struct sockaddr_storage *sa,
1169                                  socklen_t salen,
1170                                  Error **errp)
1171 {
1172     SocketAddress *addr;
1173     VsockSocketAddress *vaddr;
1174     struct sockaddr_vm *svm = (struct sockaddr_vm *)sa;
1175
1176     addr = g_new0(SocketAddress, 1);
1177     addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1178     vaddr = &addr->u.vsock;
1179     vaddr->cid = g_strdup_printf("%u", svm->svm_cid);
1180     vaddr->port = g_strdup_printf("%u", svm->svm_port);
1181
1182     return addr;
1183 }
1184 #endif /* CONFIG_AF_VSOCK */
1185
1186 SocketAddress *
1187 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1188                            socklen_t salen,
1189                            Error **errp)
1190 {
1191     switch (sa->ss_family) {
1192     case AF_INET:
1193     case AF_INET6:
1194         return socket_sockaddr_to_address_inet(sa, salen, errp);
1195
1196 #ifndef WIN32
1197     case AF_UNIX:
1198         return socket_sockaddr_to_address_unix(sa, salen, errp);
1199 #endif /* WIN32 */
1200
1201 #ifdef CONFIG_AF_VSOCK
1202     case AF_VSOCK:
1203         return socket_sockaddr_to_address_vsock(sa, salen, errp);
1204 #endif
1205
1206     default:
1207         error_setg(errp, "socket family %d unsupported",
1208                    sa->ss_family);
1209         return NULL;
1210     }
1211     return 0;
1212 }
1213
1214
1215 SocketAddress *socket_local_address(int fd, Error **errp)
1216 {
1217     struct sockaddr_storage ss;
1218     socklen_t sslen = sizeof(ss);
1219
1220     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1221         error_setg_errno(errp, errno, "%s",
1222                          "Unable to query local socket address");
1223         return NULL;
1224     }
1225
1226     return socket_sockaddr_to_address(&ss, sslen, errp);
1227 }
1228
1229
1230 SocketAddress *socket_remote_address(int fd, Error **errp)
1231 {
1232     struct sockaddr_storage ss;
1233     socklen_t sslen = sizeof(ss);
1234
1235     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1236         error_setg_errno(errp, errno, "%s",
1237                          "Unable to query remote socket address");
1238         return NULL;
1239     }
1240
1241     return socket_sockaddr_to_address(&ss, sslen, errp);
1242 }
1243
1244
1245 SocketAddress *socket_address_flatten(SocketAddressLegacy *addr_legacy)
1246 {
1247     SocketAddress *addr;
1248
1249     if (!addr_legacy) {
1250         return NULL;
1251     }
1252
1253     addr = g_new(SocketAddress, 1);
1254
1255     switch (addr_legacy->type) {
1256     case SOCKET_ADDRESS_LEGACY_KIND_INET:
1257         addr->type = SOCKET_ADDRESS_TYPE_INET;
1258         QAPI_CLONE_MEMBERS(InetSocketAddress, &addr->u.inet,
1259                            addr_legacy->u.inet.data);
1260         break;
1261     case SOCKET_ADDRESS_LEGACY_KIND_UNIX:
1262         addr->type = SOCKET_ADDRESS_TYPE_UNIX;
1263         QAPI_CLONE_MEMBERS(UnixSocketAddress, &addr->u.q_unix,
1264                            addr_legacy->u.q_unix.data);
1265         break;
1266     case SOCKET_ADDRESS_LEGACY_KIND_VSOCK:
1267         addr->type = SOCKET_ADDRESS_TYPE_VSOCK;
1268         QAPI_CLONE_MEMBERS(VsockSocketAddress, &addr->u.vsock,
1269                            addr_legacy->u.vsock.data);
1270         break;
1271     case SOCKET_ADDRESS_LEGACY_KIND_FD:
1272         addr->type = SOCKET_ADDRESS_TYPE_FD;
1273         QAPI_CLONE_MEMBERS(String, &addr->u.fd, addr_legacy->u.fd.data);
1274         break;
1275     default:
1276         abort();
1277     }
1278
1279     return addr;
1280 }