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 #ifndef _WIN32
 678
 679 static int unix_listen_saddr(UnixSocketAddress *saddr,
 680                              bool update_addr,
 681                              Error **errp)
 682 {
 683     struct sockaddr_un un;
 684     int sock, fd;
 685
 686     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 687     if (sock < 0) {
 688         error_setg_errno(errp, errno, "Failed to create Unix socket");
 689         return -1;
 690     }
 691
 692     memset(&un, 0, sizeof(un));
 693     un.sun_family = AF_UNIX;
 694     if (saddr->path && strlen(saddr->path)) {
 695         snprintf(un.sun_path, sizeof(un.sun_path), "%s", saddr->path);
 696     } else {
 697         const char *tmpdir = getenv("TMPDIR");
 698         tmpdir = tmpdir ? tmpdir : "/tmp";
 699         if (snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
 700                      tmpdir) >= sizeof(un.sun_path)) {
 701             error_setg_errno(errp, errno,
 702                              "TMPDIR environment variable (%s) too large", tmpdir);
 703             goto err;
 704         }
 705
 706         /*
 707          * This dummy fd usage silences the mktemp() unsecure warning.
 708          * Using mkstemp() doesn't make things more secure here
 709          * though.  bind() complains about existing files, so we have
 710          * to unlink first and thus re-open the race window.  The
 711          * worst case possible is bind() failing, i.e. a DoS attack.
 712          */
 713         fd = mkstemp(un.sun_path);
 714         if (fd < 0) {
 715             error_setg_errno(errp, errno,
 716                              "Failed to make a temporary socket name in %s", tmpdir);
 717             goto err;
 718         }
 719         close(fd);
 720         if (update_addr) {
 721             g_free(saddr->path);
 722             saddr->path = g_strdup(un.sun_path);
 723         }
 724     }
 725
 726     if (unlink(un.sun_path) < 0 && errno != ENOENT) {
 727         error_setg_errno(errp, errno,
 728                          "Failed to unlink socket %s", un.sun_path);
 729         goto err;
 730     }
 731     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 732         error_setg_errno(errp, errno, "Failed to bind socket to %s", un.sun_path);
 733         goto err;
 734     }
 735     if (listen(sock, 1) < 0) {
 736         error_setg_errno(errp, errno, "Failed to listen on socket");
 737         goto err;
 738     }
 739
 740     return sock;
 741
 742 err:
 743     closesocket(sock);
 744     return -1;
 745 }
 746
 747 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp,
 748                               NonBlockingConnectHandler *callback, void *opaque)
 749 {
 750     struct sockaddr_un un;
 751     ConnectState *connect_state = NULL;
 752     int sock, rc;
 753
 754     if (saddr->path == NULL) {
 755         error_setg(errp, "unix connect: no path specified");
 756         return -1;
 757     }
 758
 759     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 760     if (sock < 0) {
 761         error_setg_errno(errp, errno, "Failed to create socket");
 762         return -1;
 763     }
 764     if (callback != NULL) {
 765         connect_state = g_malloc0(sizeof(*connect_state));
 766         connect_state->callback = callback;
 767         connect_state->opaque = opaque;
 768         qemu_set_nonblock(sock);
 769     }
 770
 771     memset(&un, 0, sizeof(un));
 772     un.sun_family = AF_UNIX;
 773     snprintf(un.sun_path, sizeof(un.sun_path), "%s", saddr->path);
 774
 775     /* connect to peer */
 776     do {
 777         rc = 0;
 778         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 779             rc = -errno;
 780         }
 781     } while (rc == -EINTR);
 782
 783     if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
 784         connect_state->fd = sock;
 785         qemu_set_fd_handler(sock, NULL, wait_for_connect, connect_state);
 786         return sock;
 787     } else if (rc >= 0) {
 788         /* non blocking socket immediate success, call callback */
 789         if (callback != NULL) {
 790             callback(sock, NULL, opaque);
 791         }
 792     }
 793
 794     if (rc < 0) {
 795         error_setg_errno(errp, -rc, "Failed to connect socket");
 796         close(sock);
 797         sock = -1;
 798     }
 799
 800     g_free(connect_state);
 801     return sock;
 802 }
 803
 804 #else
 805
 806 static int unix_listen_saddr(UnixSocketAddress *saddr,
 807                              bool update_addr,
 808                              Error **errp)
 809 {
 810     error_setg(errp, "unix sockets are not available on windows");
 811     errno = ENOTSUP;
 812     return -1;
 813 }
 814
 815 static int unix_connect_saddr(UnixSocketAddress *saddr, Error **errp,
 816                               NonBlockingConnectHandler *callback, void *opaque)
 817 {
 818     error_setg(errp, "unix sockets are not available on windows");
 819     errno = ENOTSUP;
 820     return -1;
 821 }
 822 #endif
 823
 824 /* compatibility wrapper */
 825 int unix_listen(const char *str, char *ostr, int olen, Error **errp)
 826 {
 827     char *path, *optstr;
 828     int sock, len;
 829     UnixSocketAddress *saddr;
 830
 831     saddr = g_new0(UnixSocketAddress, 1);
 832
 833     optstr = strchr(str, ',');
 834     if (optstr) {
 835         len = optstr - str;
 836         if (len) {
 837             path = g_malloc(len+1);
 838             snprintf(path, len+1, "%.*s", len, str);
 839             saddr->path = path;
 840         }
 841     } else {
 842         saddr->path = g_strdup(str);
 843     }
 844
 845     sock = unix_listen_saddr(saddr, true, errp);
 846
 847     if (sock != -1 && ostr)
 848         snprintf(ostr, olen, "%s%s", saddr->path, optstr ? optstr : "");
 849     qapi_free_UnixSocketAddress(saddr);
 850     return sock;
 851 }
 852
 853 int unix_connect(const char *path, Error **errp)
 854 {
 855     UnixSocketAddress *saddr;
 856     int sock;
 857
 858     saddr = g_new0(UnixSocketAddress, 1);
 859     saddr->path = g_strdup(path);
 860     sock = unix_connect_saddr(saddr, errp, NULL, NULL);
 861     qapi_free_UnixSocketAddress(saddr);
 862     return sock;
 863 }
 864
 865
 866 SocketAddress *socket_parse(const char *str, Error **errp)
 867 {
 868     SocketAddress *addr;
 869
 870     addr = g_new0(SocketAddress, 1);
 871     if (strstart(str, "unix:", NULL)) {
 872         if (str[5] == '\0') {
 873             error_setg(errp, "invalid Unix socket address");
 874             goto fail;
 875         } else {
 876             addr->type = SOCKET_ADDRESS_KIND_UNIX;
 877             addr->u.q_unix.data = g_new(UnixSocketAddress, 1);
 878             addr->u.q_unix.data->path = g_strdup(str + 5);
 879         }
 880     } else if (strstart(str, "fd:", NULL)) {
 881         if (str[3] == '\0') {
 882             error_setg(errp, "invalid file descriptor address");
 883             goto fail;
 884         } else {
 885             addr->type = SOCKET_ADDRESS_KIND_FD;
 886             addr->u.fd.data = g_new(String, 1);
 887             addr->u.fd.data->str = g_strdup(str + 3);
 888         }
 889     } else {
 890         addr->type = SOCKET_ADDRESS_KIND_INET;
 891         addr->u.inet.data = inet_parse(str, errp);
 892         if (addr->u.inet.data == NULL) {
 893             goto fail;
 894         }
 895     }
 896     return addr;
 897
 898 fail:
 899     qapi_free_SocketAddress(addr);
 900     return NULL;
 901 }
 902
 903 int socket_connect(SocketAddress *addr, Error **errp,
 904                    NonBlockingConnectHandler *callback, void *opaque)
 905 {
 906     int fd;
 907
 908     switch (addr->type) {
 909     case SOCKET_ADDRESS_KIND_INET:
 910         fd = inet_connect_saddr(addr->u.inet.data, errp, callback, opaque);
 911         break;
 912
 913     case SOCKET_ADDRESS_KIND_UNIX:
 914         fd = unix_connect_saddr(addr->u.q_unix.data, errp, callback, opaque);
 915         break;
 916
 917     case SOCKET_ADDRESS_KIND_FD:
 918         fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
 919         if (fd >= 0 && callback) {
 920             qemu_set_nonblock(fd);
 921             callback(fd, NULL, opaque);
 922         }
 923         break;
 924
 925     default:
 926         abort();
 927     }
 928     return fd;
 929 }
 930
 931 int socket_listen(SocketAddress *addr, Error **errp)
 932 {
 933     int fd;
 934
 935     switch (addr->type) {
 936     case SOCKET_ADDRESS_KIND_INET:
 937         fd = inet_listen_saddr(addr->u.inet.data, 0, false, errp);
 938         break;
 939
 940     case SOCKET_ADDRESS_KIND_UNIX:
 941         fd = unix_listen_saddr(addr->u.q_unix.data, false, errp);
 942         break;
 943
 944     case SOCKET_ADDRESS_KIND_FD:
 945         fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
 946         break;
 947
 948     default:
 949         abort();
 950     }
 951     return fd;
 952 }
 953
 954 void socket_listen_cleanup(int fd, Error **errp)
 955 {
 956     SocketAddress *addr;
 957
 958     addr = socket_local_address(fd, errp);
 959
 960     if (addr->type == SOCKET_ADDRESS_KIND_UNIX
 961         && addr->u.q_unix.data->path) {
 962         if (unlink(addr->u.q_unix.data->path) < 0 && errno != ENOENT) {
 963             error_setg_errno(errp, errno,
 964                              "Failed to unlink socket %s",
 965                              addr->u.q_unix.data->path);
 966         }
 967     }
 968
 969     qapi_free_SocketAddress(addr);
 970 }
 971
 972 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
 973 {
 974     int fd;
 975
 976     switch (remote->type) {
 977     case SOCKET_ADDRESS_KIND_INET:
 978         fd = inet_dgram_saddr(remote->u.inet.data,
 979                               local ? local->u.inet.data : NULL, errp);
 980         break;
 981
 982     default:
 983         error_setg(errp, "socket type unsupported for datagram");
 984         fd = -1;
 985     }
 986     return fd;
 987 }
 988
 989
 990 static SocketAddress *
 991 socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,
 992                                 socklen_t salen,
 993                                 Error **errp)
 994 {
 995     char host[NI_MAXHOST];
 996     char serv[NI_MAXSERV];
 997     SocketAddress *addr;
 998     InetSocketAddress *inet;
 999     int ret;
1000
1001     ret = getnameinfo((struct sockaddr *)sa, salen,
1002                       host, sizeof(host),
1003                       serv, sizeof(serv),
1004                       NI_NUMERICHOST | NI_NUMERICSERV);
1005     if (ret != 0) {
1006         error_setg(errp, "Cannot format numeric socket address: %s",
1007                    gai_strerror(ret));
1008         return NULL;
1009     }
1010
1011     addr = g_new0(SocketAddress, 1);
1012     addr->type = SOCKET_ADDRESS_KIND_INET;
1013     inet = addr->u.inet.data = g_new0(InetSocketAddress, 1);
1014     inet->host = g_strdup(host);
1015     inet->port = g_strdup(serv);
1016     if (sa->ss_family == AF_INET) {
1017         inet->has_ipv4 = inet->ipv4 = true;
1018     } else {
1019         inet->has_ipv6 = inet->ipv6 = true;
1020     }
1021
1022     return addr;
1023 }
1024
1025
1026 #ifndef WIN32
1027 static SocketAddress *
1028 socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,
1029                                 socklen_t salen,
1030                                 Error **errp)
1031 {
1032     SocketAddress *addr;
1033     struct sockaddr_un *su = (struct sockaddr_un *)sa;
1034
1035     addr = g_new0(SocketAddress, 1);
1036     addr->type = SOCKET_ADDRESS_KIND_UNIX;
1037     addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
1038     if (su->sun_path[0]) {
1039         addr->u.q_unix.data->path = g_strndup(su->sun_path,
1040                                               sizeof(su->sun_path));
1041     }
1042
1043     return addr;
1044 }
1045 #endif /* WIN32 */
1046
1047 SocketAddress *
1048 socket_sockaddr_to_address(struct sockaddr_storage *sa,
1049                            socklen_t salen,
1050                            Error **errp)
1051 {
1052     switch (sa->ss_family) {
1053     case AF_INET:
1054     case AF_INET6:
1055         return socket_sockaddr_to_address_inet(sa, salen, errp);
1056
1057 #ifndef WIN32
1058     case AF_UNIX:
1059         return socket_sockaddr_to_address_unix(sa, salen, errp);
1060 #endif /* WIN32 */
1061
1062     default:
1063         error_setg(errp, "socket family %d unsupported",
1064                    sa->ss_family);
1065         return NULL;
1066     }
1067     return 0;
1068 }
1069
1070
1071 SocketAddress *socket_local_address(int fd, Error **errp)
1072 {
1073     struct sockaddr_storage ss;
1074     socklen_t sslen = sizeof(ss);
1075
1076     if (getsockname(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1077         error_setg_errno(errp, errno, "%s",
1078                          "Unable to query local socket address");
1079         return NULL;
1080     }
1081
1082     return socket_sockaddr_to_address(&ss, sslen, errp);
1083 }
1084
1085
1086 SocketAddress *socket_remote_address(int fd, Error **errp)
1087 {
1088     struct sockaddr_storage ss;
1089     socklen_t sslen = sizeof(ss);
1090
1091     if (getpeername(fd, (struct sockaddr *)&ss, &sslen) < 0) {
1092         error_setg_errno(errp, errno, "%s",
1093                          "Unable to query remote socket address");
1094         return NULL;
1095     }
1096
1097     return socket_sockaddr_to_address(&ss, sslen, errp);
1098 }
1099
1100 char *socket_address_to_string(struct SocketAddress *addr, Error **errp)
1101 {
1102     char *buf;
1103     InetSocketAddress *inet;
1104     char host_port[INET6_ADDRSTRLEN + 5 + 4];
1105
1106     switch (addr->type) {
1107     case SOCKET_ADDRESS_KIND_INET:
1108         inet = addr->u.inet.data;
1109         if (strchr(inet->host, ':') == NULL) {
1110             snprintf(host_port, sizeof(host_port), "%s:%s", inet->host,
1111                     inet->port);
1112             buf = g_strdup(host_port);
1113         } else {
1114             snprintf(host_port, sizeof(host_port), "[%s]:%s", inet->host,
1115                     inet->port);
1116             buf = g_strdup(host_port);
1117         }
1118         break;
1119
1120     case SOCKET_ADDRESS_KIND_UNIX:
1121         buf = g_strdup(addr->u.q_unix.data->path);
1122         break;
1123
1124     case SOCKET_ADDRESS_KIND_FD:
1125         buf = g_strdup(addr->u.fd.data->str);
1126         break;
1127
1128     default:
1129         error_setg(errp, "socket family %d unsupported",
1130                    addr->type);
1131         return NULL;
1132     }
1133     return buf;
1134 }