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 #include "monitor/monitor.h"
  21 #include "qapi/error.h"
  22 #include "qemu/sockets.h"
  23 #include "qemu/main-loop.h"
  24 #include "qapi/qmp-input-visitor.h"
  25 #include "qapi/qmp-output-visitor.h"
  26 #include "qapi-visit.h"
  27 #include "qemu/cutils.h"
  28
  29 #ifndef AI_ADDRCONFIG
  30 # define AI_ADDRCONFIG 0
  31 #endif
  32
  33 #ifndef AI_V4MAPPED
  34 # define AI_V4MAPPED 0
  35 #endif
  36
  37
  38 static int inet_getport(struct addrinfo *e)
  39 {
  40     struct sockaddr_in *i4;
  41     struct sockaddr_in6 *i6;
  42
  43     switch (e->ai_family) {
  44     case PF_INET6:
  45         i6 = (void*)e->ai_addr;
  46         return ntohs(i6->sin6_port);
  47     case PF_INET:
  48         i4 = (void*)e->ai_addr;
  49         return ntohs(i4->sin_port);
  50     default:
  51         return 0;
  52     }
  53 }
  54
  55 static void inet_setport(struct addrinfo *e, int port)
  56 {
  57     struct sockaddr_in *i4;
  58     struct sockaddr_in6 *i6;
  59
  60     switch (e->ai_family) {
  61     case PF_INET6:
  62         i6 = (void*)e->ai_addr;
  63         i6->sin6_port = htons(port);
  64         break;
  65     case PF_INET:
  66         i4 = (void*)e->ai_addr;
  67         i4->sin_port = htons(port);
  68         break;
  69     }
  70 }
  71
  72 NetworkAddressFamily inet_netfamily(int family)
  73 {
  74     switch (family) {
  75     case PF_INET6: return NETWORK_ADDRESS_FAMILY_IPV6;
  76     case PF_INET:  return NETWORK_ADDRESS_FAMILY_IPV4;
  77     case PF_UNIX:  return NETWORK_ADDRESS_FAMILY_UNIX;
  78     }
  79     return NETWORK_ADDRESS_FAMILY_UNKNOWN;
  80 }
  81
  82 /*
  83  * Matrix we're trying to apply
  84  *
  85  *  ipv4  ipv6   family
  86  *   -     -       PF_UNSPEC
  87  *   -     f       PF_INET
  88  *   -     t       PF_INET6
  89  *   f     -       PF_INET6
  90  *   f     f       <error>
  91  *   f     t       PF_INET6
  92  *   t     -       PF_INET
  93  *   t     f       PF_INET
  94  *   t     t       PF_INET6
  95  *
  96  * NB, this matrix is only about getting the necessary results
  97  * from getaddrinfo(). Some of the cases require further work
  98  * after reading results from getaddrinfo in order to fully
  99  * apply the logic the end user wants. eg with the last case
 100  * ipv4=t + ipv6=t + PF_INET6, getaddrinfo alone can only
 101  * guarantee the ipv6=t part of the request - we need more
 102  * checks to provide ipv4=t part of the guarantee. This is
 103  * outside scope of this method and not currently handled by
 104  * callers at all.
 105  */
 106 static int inet_ai_family_from_address(InetSocketAddress *addr,
 107                                        Error **errp)
 108 {
 109     if (addr->has_ipv6 && addr->has_ipv4 &&
 110         !addr->ipv6 && !addr->ipv4) {
 111         error_setg(errp, "Cannot disable IPv4 and IPv6 at same time");
 112         return PF_UNSPEC;
 113     }
 114     if ((addr->has_ipv6 && addr->ipv6) || (addr->has_ipv4 && !addr->ipv4)) {
 115         return PF_INET6;
 116     }
 117     if ((addr->has_ipv4 && addr->ipv4) || (addr->has_ipv6 && !addr->ipv6)) {
 118         return PF_INET;
 119     }
 120     return PF_UNSPEC;
 121 }
 122
 123 static int inet_listen_saddr(InetSocketAddress *saddr,
 124                              int port_offset,
 125                              bool update_addr,
 126                              Error **errp)
 127 {
 128     struct addrinfo ai,*res,*e;
 129     char port[33];
 130     char uaddr[INET6_ADDRSTRLEN+1];
 131     char uport[33];
 132     int slisten, rc, port_min, port_max, p;
 133     Error *err = NULL;
 134
 135     memset(&ai,0, sizeof(ai));
 136     ai.ai_flags = AI_PASSIVE;
 137     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 138     ai.ai_socktype = SOCK_STREAM;
 139
 140     if (err) {
 141         error_propagate(errp, err);
 142         return -1;
 143     }
 144
 145     if (saddr->host == NULL) {
 146         error_setg(errp, "host not specified");
 147         return -1;
 148     }
 149     if (saddr->port != NULL) {
 150         pstrcpy(port, sizeof(port), saddr->port);
 151     } else {
 152         port[0] = '\0';
 153     }
 154
 155     /* lookup */
 156     if (port_offset) {
 157         unsigned long long baseport;
 158         if (strlen(port) == 0) {
 159             error_setg(errp, "port not specified");
 160             return -1;
 161         }
 162         if (parse_uint_full(port, &baseport, 10) < 0) {
 163             error_setg(errp, "can't convert to a number: %s", port);
 164             return -1;
 165         }
 166         if (baseport > 65535 ||
 167             baseport + port_offset > 65535) {
 168             error_setg(errp, "port %s out of range", port);
 169             return -1;
 170         }
 171         snprintf(port, sizeof(port), "%d", (int)baseport + port_offset);
 172     }
 173     rc = getaddrinfo(strlen(saddr->host) ? saddr->host : NULL,
 174                      strlen(port) ? port : NULL, &ai, &res);
 175     if (rc != 0) {
 176         error_setg(errp, "address resolution failed for %s:%s: %s",
 177                    saddr->host, port, gai_strerror(rc));
 178         return -1;
 179     }
 180
 181     /* create socket + bind */
 182     for (e = res; e != NULL; e = e->ai_next) {
 183         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 184                         uaddr,INET6_ADDRSTRLEN,uport,32,
 185                         NI_NUMERICHOST | NI_NUMERICSERV);
 186         slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 187         if (slisten < 0) {
 188             if (!e->ai_next) {
 189                 error_setg_errno(errp, errno, "Failed to create socket");
 190             }
 191             continue;
 192         }
 193
 194         socket_set_fast_reuse(slisten);
 195 #ifdef IPV6_V6ONLY
 196         if (e->ai_family == PF_INET6) {
 197             /* listen on both ipv4 and ipv6 */
 198             const int off = 0;
 199             qemu_setsockopt(slisten, IPPROTO_IPV6, IPV6_V6ONLY, &off,
 200                             sizeof(off));
 201         }
 202 #endif
 203
 204         port_min = inet_getport(e);
 205         port_max = saddr->has_to ? saddr->to + port_offset : port_min;
 206         for (p = port_min; p <= port_max; p++) {
 207             inet_setport(e, p);
 208             if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
 209                 goto listen;
 210             }
 211             if (p == port_max) {
 212                 if (!e->ai_next) {
 213                     error_setg_errno(errp, errno, "Failed to bind socket");
 214                 }
 215             }
 216         }
 217         closesocket(slisten);
 218     }
 219     freeaddrinfo(res);
 220     return -1;
 221
 222 listen:
 223     if (listen(slisten,1) != 0) {
 224         error_setg_errno(errp, errno, "Failed to listen on socket");
 225         closesocket(slisten);
 226         freeaddrinfo(res);
 227         return -1;
 228     }
 229     if (update_addr) {
 230         g_free(saddr->host);
 231         saddr->host = g_strdup(uaddr);
 232         g_free(saddr->port);
 233         saddr->port = g_strdup_printf("%d",
 234                                       inet_getport(e) - port_offset);
 235         saddr->has_ipv6 = saddr->ipv6 = e->ai_family == PF_INET6;
 236         saddr->has_ipv4 = saddr->ipv4 = e->ai_family != PF_INET6;
 237     }
 238     freeaddrinfo(res);
 239     return slisten;
 240 }
 241
 242 #ifdef _WIN32
 243 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 244     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 245 #else
 246 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 247     ((rc) == -EINPROGRESS)
 248 #endif
 249
 250 /* Struct to store connect state for non blocking connect */
 251 typedef struct ConnectState {
 252     int fd;
 253     struct addrinfo *addr_list;
 254     struct addrinfo *current_addr;
 255     NonBlockingConnectHandler *callback;
 256     void *opaque;
 257 } ConnectState;
 258
 259 static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
 260                              ConnectState *connect_state, Error **errp);
 261
 262 static void wait_for_connect(void *opaque)
 263 {
 264     ConnectState *s = opaque;
 265     int val = 0, rc = 0;
 266     socklen_t valsize = sizeof(val);
 267     bool in_progress;
 268     Error *err = NULL;
 269
 270     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 271
 272     do {
 273         rc = qemu_getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
 274     } while (rc == -1 && errno == EINTR);
 275
 276     /* update rc to contain error */
 277     if (!rc && val) {
 278         rc = -1;
 279         errno = val;
 280     }
 281
 282     /* connect error */
 283     if (rc < 0) {
 284         error_setg_errno(&err, errno, "Error connecting to socket");
 285         closesocket(s->fd);
 286         s->fd = rc;
 287     }
 288
 289     /* try to connect to the next address on the list */
 290     if (s->current_addr) {
 291         while (s->current_addr->ai_next != NULL && s->fd < 0) {
 292             s->current_addr = s->current_addr->ai_next;
 293             s->fd = inet_connect_addr(s->current_addr, &in_progress, s, NULL);
 294             if (s->fd < 0) {
 295                 error_free(err);
 296                 err = NULL;
 297                 error_setg_errno(&err, errno, "Unable to start socket connect");
 298             }
 299             /* connect in progress */
 300             if (in_progress) {
 301                 goto out;
 302             }
 303         }
 304
 305         freeaddrinfo(s->addr_list);
 306     }
 307
 308     if (s->callback) {
 309         s->callback(s->fd, err, s->opaque);
 310     }
 311     g_free(s);
 312 out:
 313     error_free(err);
 314 }
 315
 316 static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
 317                              ConnectState *connect_state, Error **errp)
 318 {
 319     int sock, rc;
 320
 321     *in_progress = false;
 322
 323     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 324     if (sock < 0) {
 325         error_setg_errno(errp, errno, "Failed to create socket");
 326         return -1;
 327     }
 328     socket_set_fast_reuse(sock);
 329     if (connect_state != NULL) {
 330         qemu_set_nonblock(sock);
 331     }
 332     /* connect to peer */
 333     do {
 334         rc = 0;
 335         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 336             rc = -errno;
 337         }
 338     } while (rc == -EINTR);
 339
 340     if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
 341         connect_state->fd = sock;
 342         qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
 343         *in_progress = true;
 344     } else if (rc < 0) {
 345         error_setg_errno(errp, errno, "Failed to connect socket");
 346         closesocket(sock);
 347         return -1;
 348     }
 349     return sock;
 350 }
 351
 352 static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
 353                                                  Error **errp)
 354 {
 355     struct addrinfo ai, *res;
 356     int rc;
 357     Error *err = NULL;
 358     static int useV4Mapped = 1;
 359
 360     memset(&ai, 0, sizeof(ai));
 361
 362     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 363     if (atomic_read(&useV4Mapped)) {
 364         ai.ai_flags |= AI_V4MAPPED;
 365     }
 366     ai.ai_family = inet_ai_family_from_address(saddr, &err);
 367     ai.ai_socktype = SOCK_STREAM;
 368
 369     if (err) {
 370         error_propagate(errp, err);
 371         return NULL;
 372     }
 373
 374     if (saddr->host == NULL || saddr->port == NULL) {
 375         error_setg(errp, "host and/or port not specified");
 376         return NULL;
 377     }
 378
 379     /* lookup */
 380     rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 381
 382     /* At least FreeBSD and OS-X 10.6 declare AI_V4MAPPED but
 383      * then don't implement it in their getaddrinfo(). Detect
 384      * this and retry without the flag since that's preferrable
 385      * to a fatal error
 386      */
 387     if (rc == EAI_BADFLAGS &&
 388         (ai.ai_flags & AI_V4MAPPED)) {
 389         atomic_set(&useV4Mapped, 0);
 390         ai.ai_flags &= ~AI_V4MAPPED;
 391         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
 392     }
 393     if (rc != 0) {
 394         error_setg(errp, "address resolution failed for %s:%s: %s",
 395                    saddr->host, saddr->port, gai_strerror(rc));
 396         return NULL;
 397     }
 398     return res;
 399 }
 400
 401 /**
 402  * Create a socket and connect it to an address.
 403  *
 404  * @saddr: Inet socket address specification
 405  * @errp: set on error
 406  * @callback: callback function for non-blocking connect
 407  * @opaque: opaque for callback function
 408  *
 409  * Returns: -1 on error, file descriptor on success.
 410  *
 411  * If @callback is non-null, the connect is non-blocking.  If this
 412  * function succeeds, callback will be called when the connection
 413  * completes, with the file descriptor on success, or -1 on error.
 414  */
 415 static int inet_connect_saddr(InetSocketAddress *saddr, Error **errp,
 416                               NonBlockingConnectHandler *callback, void *opaque)
 417 {
 418     Error *local_err = NULL;
 419     struct addrinfo *res, *e;
 420     int sock = -1;
 421     bool in_progress;
 422     ConnectState *connect_state = NULL;
 423
 424     res = inet_parse_connect_saddr(saddr, errp);
 425     if (!res) {
 426         return -1;
 427     }
 428
 429     if (callback != NULL) {
 430         connect_state = g_malloc0(sizeof(*connect_state));
 431         connect_state->addr_list = res;
 432         connect_state->callback = callback;
 433         connect_state->opaque = opaque;
 434     }
 435
 436     for (e = res; e != NULL; e = e->ai_next) {
 437         error_free(local_err);
 438         local_err = NULL;
 439         if (connect_state != NULL) {
 440             connect_state->current_addr = e;
 441         }
 442         sock = inet_connect_addr(e, &in_progress, connect_state, &local_err);
 443         if (sock >= 0) {
 444             break;
 445         }
 446     }
 447
 448     if (sock < 0) {
 449         error_propagate(errp, local_err);
 450     } else if (in_progress) {
 451         /* wait_for_connect() will do the rest */
 452         return sock;
 453     } else {
 454         if (callback) {
 455             callback(sock, NULL, opaque);
 456         }
 457     }
 458     g_free(connect_state);
 459     freeaddrinfo(res);
 460     return sock;
 461 }
 462
 463 static int inet_dgram_saddr(InetSocketAddress *sraddr,
 464                             InetSocketAddress *sladdr,
 465                             Error **errp)
 466 {
 467     struct addrinfo ai, *peer = NULL, *local = NULL;
 468     const char *addr;
 469     const char *port;
 470     int sock = -1, rc;
 471     Error *err = NULL;
 472
 473     /* lookup peer addr */
 474     memset(&ai,0, sizeof(ai));
 475     ai.ai_flags = AI_CANONNAME | AI_V4MAPPED | AI_ADDRCONFIG;
 476     ai.ai_family = inet_ai_family_from_address(sraddr, &err);
 477     ai.ai_socktype = SOCK_DGRAM;
 478
 479     if (err) {
 480         error_propagate(errp, err);
 481         goto err;
 482     }
 483
 484     addr = sraddr->host;
 485     port = sraddr->port;
 486     if (addr == NULL || strlen(addr) == 0) {
 487         addr = "localhost";
 488     }
 489     if (port == NULL || strlen(port) == 0) {
 490         error_setg(errp, "remote port not specified");
 491         goto err;
 492     }
 493
 494     if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
 495         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 496                    gai_strerror(rc));
 497         goto err;
 498     }
 499
 500     /* lookup local addr */
 501     memset(&ai,0, sizeof(ai));
 502     ai.ai_flags = AI_PASSIVE;
 503     ai.ai_family = peer->ai_family;
 504     ai.ai_socktype = SOCK_DGRAM;
 505
 506     if (sladdr) {
 507         addr = sladdr->host;
 508         port = sladdr->port;
 509         if (addr == NULL || strlen(addr) == 0) {
 510             addr = NULL;
 511         }
 512         if (!port || strlen(port) == 0) {
 513             port = "0";
 514         }
 515     } else {
 516         addr = NULL;
 517         port = "0";
 518     }
 519
 520     if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
 521         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 522                    gai_strerror(rc));
 523         goto err;
 524     }
 525
 526     /* create socket */
 527     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 528     if (sock < 0) {
 529         error_setg_errno(errp, errno, "Failed to create socket");
 530         goto err;
 531     }
 532     socket_set_fast_reuse(sock);
 533
 534     /* bind socket */
 535     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 536         error_setg_errno(errp, errno, "Failed to bind socket");
 537         goto err;
 538     }
 539
 540     /* connect to peer */
 541     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 542         error_setg_errno(errp, errno, "Failed to connect socket");
 543         goto err;
 544     }
 545
 546     freeaddrinfo(local);
 547     freeaddrinfo(peer);
 548     return sock;
 549
 550 err:
 551     if (-1 != sock)
 552         closesocket(sock);
 553     if (local)
 554         freeaddrinfo(local);
 555     if (peer)
 556         freeaddrinfo(peer);
 557     return -1;
 558 }
 559
 560 /* compatibility wrapper */
 561 InetSocketAddress *inet_parse(const char *str, Error **errp)
 562 {
 563     InetSocketAddress *addr;
 564     const char *optstr, *h;
 565     char host[65];
 566     char port[33];
 567     int to;
 568     int pos;
 569
 570     addr = g_new0(InetSocketAddress, 1);
 571
 572     /* parse address */
 573     if (str[0] == ':') {
 574         /* no host given */
 575         host[0] = '\0';
 576         if (1 != sscanf(str, ":%32[^,]%n", port, &pos)) {
 577             error_setg(errp, "error parsing port in address '%s'", str);
 578             goto fail;
 579         }
 580     } else if (str[0] == '[') {
 581         /* IPv6 addr */
 582         if (2 != sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos)) {
 583             error_setg(errp, "error parsing IPv6 address '%s'", str);
 584             goto fail;
 585         }
 586         addr->ipv6 = addr->has_ipv6 = true;
 587     } else {
 588         /* hostname or IPv4 addr */
 589         if (2 != sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos)) {
 590             error_setg(errp, "error parsing address '%s'", str);
 591             goto fail;
 592         }
 593         if (host[strspn(host, "0123456789.")] == '\0') {
 594             addr->ipv4 = addr->has_ipv4 = true;
 595         }
 596     }
 597
 598     addr->host = g_strdup(host);
 599     addr->port = g_strdup(port);
 600
 601     /* parse options */
 602     optstr = str + pos;
 603     h = strstr(optstr, ",to=");
 604     if (h) {
 605         h += 4;
 606         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 607             (h[pos] != '\0' && h[pos] != ',')) {
 608             error_setg(errp, "error parsing to= argument");
 609             goto fail;
 610         }
 611         addr->has_to = true;
 612         addr->to = to;
 613     }
 614     if (strstr(optstr, ",ipv4")) {
 615         addr->ipv4 = addr->has_ipv4 = true;
 616     }
 617     if (strstr(optstr, ",ipv6")) {
 618         addr->ipv6 = addr->has_ipv6 = true;
 619     }
 620     return addr;
 621
 622 fail:
 623     qapi_free_InetSocketAddress(addr);
 624     return NULL;
 625 }
 626
 627 int inet_listen(const char *str, char *ostr, int olen,
 628                 int socktype, int port_offset, Error **errp)
 629 {
 630     char *optstr;
 631     int sock = -1;
 632     InetSocketAddress *addr;
 633
 634     addr = inet_parse(str, errp);
 635     if (addr != NULL) {
 636         sock = inet_listen_saddr(addr, port_offset, true, errp);
 637         if (sock != -1 && ostr) {
 638             optstr = strchr(str, ',');
 639             if (addr->ipv6) {
 640                 snprintf(ostr, olen, "[%s]:%s%s",
 641                          addr->host,
 642                          addr->port,
 643                          optstr ? optstr : "");
 644             } else {
 645                 snprintf(ostr, olen, "%s:%s%s",
 646                          addr->host,
 647                          addr->port,
 648                          optstr ? optstr : "");
 649             }
 650         }
 651         qapi_free_InetSocketAddress(addr);
 652     }
 653     return sock;
 654 }
 655
 656 /**
 657  * Create a blocking socket and connect it to an address.
 658  *
 659  * @str: address string
 660  * @errp: set in case of an error
 661  *
 662  * Returns -1 in case of error, file descriptor on success
 663  **/
 664 int inet_connect(const char *str, Error **errp)
 665 {
 666     int sock = -1;
 667     InetSocketAddress *addr;
 668
 669     addr = inet_parse(str, errp);
 670     if (addr != NULL) {
 671         sock = inet_connect_saddr(addr, errp, NULL, NULL);
 672         qapi_free_InetSocketAddress(addr);
 673     }
 674     return sock;
 675 }
 676
 677 /**
 678  * Create a non-blocking socket and connect it to an address.
 679  * Calls the callback function with fd in case of success or -1 in case of
 680  * error.
 681  *
 682  * @str: address string
 683  * @callback: callback function that is called when connect completes,
 684  *            cannot be NULL.
 685  * @opaque: opaque for callback function
 686  * @errp: set in case of an error
 687  *
 688  * Returns: -1 on immediate error, file descriptor on success.
 689  **/
 690 int inet_nonblocking_connect(const char *str,
 691                              NonBlockingConnectHandler *callback,
 692                              void *opaque, Error **errp)
 693 {
 694     int sock = -1;
 695     InetSocketAddress *addr;
 696
 697     g_assert(callback != NULL);
 698
 699     addr = inet_parse(str, errp);
 700     if (addr != NULL) {
 701         sock = inet_connect_saddr(addr, errp, callback, opaque);
 702         qapi_free_InetSocketAddress(addr);
 703     }
 704     return sock;
 705 }
 706
 707 #ifndef _WIN32
 708
 709 static int unix_listen_saddr(UnixSocketAddress *saddr,
 710                              bool update_addr,
 711                              Error **errp)
 712 {
 713     struct sockaddr_un un;
 714     int sock, fd;
 715
 716     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 717     if (sock < 0) {
 718         error_setg_errno(errp, errno, "Failed to create Unix socket");
 719         return -1;
 720     }
 721
 722     memset(&un, 0, sizeof(un));
 723     un.sun_family = AF_UNIX;
 724     if (saddr->path && strlen(saddr->path)) {
 725         snprintf(un.sun_path, sizeof(un.sun_path), "%s", saddr->path);
 726     } else {
 727         const char *tmpdir = getenv("TMPDIR");
 728         tmpdir = tmpdir ? tmpdir : "/tmp";
 729         if (snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
 730                      tmpdir) >= sizeof(un.sun_path)) {
 731             error_setg_errno(errp, errno,
 732                              "TMPDIR environment variable (%s) too large", tmpdir);
 733             goto err;
 734         }
 735
 736         /*
 737          * This dummy fd usage silences the mktemp() unsecure warning.
 738          * Using mkstemp() doesn't make things more secure here
 739          * though.  bind() complains about existing files, so we have
 740          * to unlink first and thus re-open the race window.  The
 741          * worst case possible is bind() failing, i.e. a DoS attack.
 742          */
 743         fd = mkstemp(un.sun_path);
 744         if (fd < 0) {
 745             error_setg_errno(errp, errno,
 746                              "Failed to make a temporary socket name in %s", tmpdir);
 747             goto err;
 748         }
 749         close(fd);
 750         if (update_addr) {
 751             g_free(saddr->path);
 752             saddr->path = g_strdup(un.sun_path);
 753         }
 754     }
 755
 756     if (unlink(un.sun_path) < 0 && errno != ENOENT) {
 757         error_setg_errno(errp, errno,
 758                          "Failed to unlink socket %s", un.sun_path);
 759         goto err;
 760     }
 761     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 762         error_setg_errno(errp, errno, "Failed to bind socket to %s", un.sun_path);
 763         goto err;
 764     }
 765     if (listen(sock, 1) < 0) {
 766         error_setg_errno(errp, errno, "Failed to listen on socket");
 767         goto err;
 768     }
 769
 770     return sock;
 771
 772 err:
 773     closesocket(sock);
 774     return -1;
 775 }
 776
 777 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp,
 778                               NonBlockingConnectHandler *callback, void *opaque)
 779 {
 780     struct sockaddr_un un;
 781     ConnectState *connect_state = NULL;
 782     int sock, rc;
 783
 784     if (saddr->path == NULL) {
 785         error_setg(errp, "unix connect: no path specified");
 786         return -1;
 787     }
 788
 789     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 790     if (sock < 0) {
 791         error_setg_errno(errp, errno, "Failed to create socket");
 792         return -1;
 793     }
 794     if (callback != NULL) {
 795         connect_state = g_malloc0(sizeof(*connect_state));
 796         connect_state->callback = callback;
 797         connect_state->opaque = opaque;
 798         qemu_set_nonblock(sock);
 799     }
 800
 801     memset(&un, 0, sizeof(un));
 802     un.sun_family = AF_UNIX;
 803     snprintf(un.sun_path, sizeof(un.sun_path), "%s", saddr->path);
 804
 805     /* connect to peer */
 806     do {
 807         rc = 0;
 808         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 809             rc = -errno;
 810         }
 811     } while (rc == -EINTR);
 812
 813     if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
 814         connect_state->fd = sock;
 815         qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
 816         return sock;
 817     } else if (rc >= 0) {
 818         /* non blocking socket immediate success, call callback */
 819         if (callback != NULL) {
 820             callback(sock, NULL, opaque);
 821         }
 822     }
 823
 824     if (rc < 0) {
 825         error_setg_errno(errp, -rc, "Failed to connect socket");
 826         close(sock);
 827         sock = -1;
 828     }
 829
 830     g_free(connect_state);
 831     return sock;
 832 }
 833
 834 #else
 835
 836 static int unix_listen_saddr(UnixSocketAddress *saddr,
 837                              bool update_addr,
 838                              Error **errp)
 839 {
 840     error_setg(errp, "unix sockets are not available on windows");
 841     errno = ENOTSUP;
 842     return -1;
 843 }
 844
 845 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp,
 846                               NonBlockingConnectHandler *callback, void *opaque)
 847 {
 848     error_setg(errp, "unix sockets are not available on windows");
 849     errno = ENOTSUP;
 850     return -1;
 851 }
 852 #endif
 853
 854 /* compatibility wrapper */
 855 int unix_listen(const char *str, char *ostr, int olen, Error **errp)
 856 {
 857     char *path, *optstr;
 858     int sock, len;
 859     UnixSocketAddress *saddr;
 860
 861     saddr = g_new0(UnixSocketAddress, 1);
 862
 863     optstr = strchr(str, ',');
 864     if (optstr) {
 865         len = optstr - str;
 866         if (len) {
 867             path = g_malloc(len+1);
 868             snprintf(path, len+1, "%.*s", len, str);
 869             saddr->path = path;
 870         }
 871     } else {
 872         saddr->path = g_strdup(str);
 873     }
 874
 875     sock = unix_listen_saddr(saddr, true, errp);
 876
 877     if (sock != -1 && ostr)
 878         snprintf(ostr, olen, "%s%s", saddr->path, optstr ? optstr : "");
 879     qapi_free_UnixSocketAddress(saddr);
 880     return sock;
 881 }
 882
 883 int unix_connect(const char *path, Error **errp)
 884 {
 885     UnixSocketAddress *saddr;
 886     int sock;
 887
 888     saddr = g_new0(UnixSocketAddress, 1);
 889     saddr->path = g_strdup(path);
 890     sock = unix_connect_saddr(saddr, errp, NULL, NULL);
 891     qapi_free_UnixSocketAddress(saddr);
 892     return sock;
 893 }
 894
 895
 896 int unix_nonblocking_connect(const char *path,
 897                              NonBlockingConnectHandler *callback,
 898                              void *opaque, Error **errp)
 899 {
 900     UnixSocketAddress *saddr;
 901     int sock = -1;
 902
 903     g_assert(callback != NULL);
 904
 905     saddr = g_new0(UnixSocketAddress, 1);
 906     saddr->path = g_strdup(path);
 907     sock = unix_connect_saddr(saddr, errp, callback, opaque);
 908     qapi_free_UnixSocketAddress(saddr);
 909     return sock;
 910 }
 911
 912 SocketAddress *socket_parse(const char *str, Error **errp)
 913 {
 914     SocketAddress *addr;
 915
 916     addr = g_new0(SocketAddress, 1);
 917     if (strstart(str, "unix:", NULL)) {
 918         if (str[5] == '\0') {
 919             error_setg(errp, "invalid Unix socket address");
 920             goto fail;
 921         } else {
 922             addr->type = SOCKET_ADDRESS_KIND_UNIX;
 923             addr->u.q_unix.data = g_new(UnixSocketAddress, 1);
 924             addr->u.q_unix.data->path = g_strdup(str + 5);
 925         }
 926     } else if (strstart(str, "fd:", NULL)) {
 927         if (str[3] == '\0') {
 928             error_setg(errp, "invalid file descriptor address");
 929             goto fail;
 930         } else {
 931             addr->type = SOCKET_ADDRESS_KIND_FD;
 932             addr->u.fd.data = g_new(String, 1);
 933             addr->u.fd.data->str = g_strdup(str + 3);
 934         }
 935     } else {
 936         addr->type = SOCKET_ADDRESS_KIND_INET;
 937         addr->u.inet.data = inet_parse(str, errp);
 938         if (addr->u.inet.data == NULL) {
 939             goto fail;
 940         }
 941     }
 942     return addr;
 943
 944 fail:
 945     qapi_free_SocketAddress(addr);
 946     return NULL;
 947 }
 948
 949 int socket_connect(SocketAddress *addr, Error **errp,
 950                    NonBlockingConnectHandler *callback, void *opaque)
 951 {
 952     int fd;
 953
 954     switch (addr->type) {
 955     case SOCKET_ADDRESS_KIND_INET:
 956         fd = inet_connect_saddr(addr->u.inet.data, errp, callback, opaque);
 957         break;
 958
 959     case SOCKET_ADDRESS_KIND_UNIX:
 960         fd = unix_connect_saddr(addr->u.q_unix.data, errp, callback, opaque);
 961         break;
 962
 963     case SOCKET_ADDRESS_KIND_FD:
 964         fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
 965         if (fd >= 0 && callback) {
 966             qemu_set_nonblock(fd);
 967             callback(fd, NULL, opaque);
 968         }
 969         break;
 970
 971     default:
 972         abort();
 973     }
 974     return fd;
 975 }
 976
 977 int socket_listen(SocketAddress *addr, Error **errp)
 978 {
 979     int fd;
 980
 981     switch (addr->type) {
 982     case SOCKET_ADDRESS_KIND_INET:
 983         fd = inet_listen_saddr(addr->u.inet.data, 0, false, errp);
 984         break;
 985
 986     case SOCKET_ADDRESS_KIND_UNIX:
 987         fd = unix_listen_saddr(addr->u.q_unix.data, false, errp);
 988         break;
 989
 990     case SOCKET_ADDRESS_KIND_FD:
 991         fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
 992         break;
 993
 994     default:
 995         abort();
 996     }
 997     return fd;
 998 }
 999
1000 void socket_listen_cleanup(int fd, Error **errp)
1001 {
1002     SocketAddress *addr;
1003
1004     addr = socket_local_address(fd, errp);
1005
1006     if (addr->type == SOCKET_ADDRESS_KIND_UNIX
1007         && addr->u.q_unix.data->path) {
1008         if (unlink(addr->u.q_unix.data->path) < 0 && errno != ENOENT) {
1009             error_setg_errno(errp, errno,
1010                              "Failed to unlink socket %s",
1011                              addr->u.q_unix.data->path);
1012         }
1013     }
1014
1015     qapi_free_SocketAddress(addr);
1016 }
1017
1018 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
1019 {
1020     int fd;
1021
1022     switch (remote->type) {
1023     case SOCKET_ADDRESS_KIND_INET:
1024         fd = inet_dgram_saddr(remote->u.inet.data,
1025                               local ? local->u.inet.data : NULL, errp);
1026         break;
1027
1028     default:
1029         error_setg(errp, "socket type unsupported for datagram");
1030         fd = -1;
1031     }
1032     return fd;
1033 }
1034
1035
1036 static SocketAddress *
1037 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
1038                                 socklen_t salen,
1039                                 Error **errp)
1040 {
1041     char host[NI_MAXHOST];
1042     char serv[NI_MAXSERV];
1043     SocketAddress *addr;
1044     InetSocketAddress *inet;
1045     int ret;
1046
1047     ret = getnameinfo((struct sockaddr *)sa, salen,
1048                       host, sizeof(host),
1049                       serv, sizeof(serv),
1050                       NI_NUMERICHOST | NI_NUMERICSERV);
1051     if (ret != 0) {
1052         error_setg(errp, "Cannot format numeric socket address: %s",
1053                    gai_strerror(ret));
1054         return NULL;
1055     }
1056
1057     addr = g_new0(SocketAddress, 1);
1058     addr->type = SOCKET_ADDRESS_KIND_INET;
1059     inet = addr->u.inet.data = g_new0(InetSocketAddress, 1);
1060     inet->host = g_strdup(host);
1061     inet->port = g_strdup(serv);
1062     if (sa->ss_family == AF_INET) {
1063         inet->has_ipv4 = inet->ipv4 = true;
1064     } else {
1065         inet->has_ipv6 = inet->ipv6 = true;
1066     }
1067
1068     return addr;
1069 }
1070
1071
1072 #ifndef WIN32
1073 static SocketAddress *
1074 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1075                                 socklen_t salen,
1076                                 Error **errp)
1077 {
1078     SocketAddress *addr;
1079     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1080
1081     addr = g_new0(SocketAddress, 1);
1082     addr->type = SOCKET_ADDRESS_KIND_UNIX;
1083     addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
1084     if (su->sun_path[0]) {
1085         addr->u.q_unix.data->path = g_strndup(su->sun_path,
1086                                               sizeof(su->sun_path));
1087     }
1088
1089     return addr;
1090 }
1091 #endif /* WIN32 */
1092
1093 SocketAddress *
1094 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1095                            socklen_t salen,
1096                            Error **errp)
1097 {
1098     switch (sa->ss_family) {
1099     case AF_INET:
1100     case AF_INET6:
1101         return socket_sockaddr_to_address_inet(sa, salen, errp);
1102
1103 #ifndef WIN32
1104     case AF_UNIX:
1105         return socket_sockaddr_to_address_unix(sa, salen, errp);
1106 #endif /* WIN32 */
1107
1108     default:
1109         error_setg(errp, "socket family %d unsupported",
1110                    sa->ss_family);
1111         return NULL;
1112     }
1113     return 0;
1114 }
1115
1116
1117 SocketAddress *socket_local_address(int fd, Error **errp)
1118 {
1119     struct sockaddr_storage ss;
1120     socklen_t sslen = sizeof(ss);
1121
1122     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1123         error_setg_errno(errp, errno, "%s",
1124                          "Unable to query local socket address");
1125         return NULL;
1126     }
1127
1128     return socket_sockaddr_to_address(&ss, sslen, errp);
1129 }
1130
1131
1132 SocketAddress *socket_remote_address(int fd, Error **errp)
1133 {
1134     struct sockaddr_storage ss;
1135     socklen_t sslen = sizeof(ss);
1136
1137     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1138         error_setg_errno(errp, errno, "%s",
1139                          "Unable to query remote socket address");
1140         return NULL;
1141     }
1142
1143     return socket_sockaddr_to_address(&ss, sslen, errp);
1144 }
1145
1146 char *socket_address_to_string(struct SocketAddress *addr, Error **errp)
1147 {
1148     char *buf;
1149     InetSocketAddress *inet;
1150     char host_port[INET6_ADDRSTRLEN + 5 + 4];
1151
1152     switch (addr->type) {
1153     case SOCKET_ADDRESS_KIND_INET:
1154         inet = addr->u.inet.data;
1155         if (strchr(inet->host, ':') == NULL) {
1156             snprintf(host_port, sizeof(host_port), "%s:%s", inet->host,
1157                     inet->port);
1158             buf = g_strdup(host_port);
1159         } else {
1160             snprintf(host_port, sizeof(host_port), "[%s]:%s", inet->host,
1161                     inet->port);
1162             buf = g_strdup(host_port);
1163         }
1164         break;
1165
1166     case SOCKET_ADDRESS_KIND_UNIX:
1167         buf = g_strdup(addr->u.q_unix.data->path);
1168         break;
1169
1170     case SOCKET_ADDRESS_KIND_FD:
1171         buf = g_strdup(addr->u.fd.data->str);
1172         break;
1173
1174     default:
1175         error_setg(errp, "socket family %d unsupported",
1176                    addr->type);
1177         return NULL;
1178     }
1179     return buf;
1180 }