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 <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <ctype.h>
  22 #include <errno.h>
  23 #include <unistd.h>
  24
  25 #include "monitor/monitor.h"
  26 #include "qemu/sockets.h"
  27 #include "qemu/main-loop.h"
  28
  29 #ifndef AI_ADDRCONFIG
  30 # define AI_ADDRCONFIG 0
  31 #endif
  32
  33 static const int on=1, off=0;
  34
  35 /* used temporarily until all users are converted to QemuOpts */
  36 QemuOptsList socket_optslist = {
  37     .name = "socket",
  38     .head = QTAILQ_HEAD_INITIALIZER(socket_optslist.head),
  39     .desc = {
  40         {
  41             .name = "path",
  42             .type = QEMU_OPT_STRING,
  43         },{
  44             .name = "host",
  45             .type = QEMU_OPT_STRING,
  46         },{
  47             .name = "port",
  48             .type = QEMU_OPT_STRING,
  49         },{
  50             .name = "to",
  51             .type = QEMU_OPT_NUMBER,
  52         },{
  53             .name = "ipv4",
  54             .type = QEMU_OPT_BOOL,
  55         },{
  56             .name = "ipv6",
  57             .type = QEMU_OPT_BOOL,
  58         },
  59         { /* end if list */ }
  60     },
  61 };
  62
  63 static int inet_getport(struct addrinfo *e)
  64 {
  65     struct sockaddr_in *i4;
  66     struct sockaddr_in6 *i6;
  67
  68     switch (e->ai_family) {
  69     case PF_INET6:
  70         i6 = (void*)e->ai_addr;
  71         return ntohs(i6->sin6_port);
  72     case PF_INET:
  73         i4 = (void*)e->ai_addr;
  74         return ntohs(i4->sin_port);
  75     default:
  76         return 0;
  77     }
  78 }
  79
  80 static void inet_setport(struct addrinfo *e, int port)
  81 {
  82     struct sockaddr_in *i4;
  83     struct sockaddr_in6 *i6;
  84
  85     switch (e->ai_family) {
  86     case PF_INET6:
  87         i6 = (void*)e->ai_addr;
  88         i6->sin6_port = htons(port);
  89         break;
  90     case PF_INET:
  91         i4 = (void*)e->ai_addr;
  92         i4->sin_port = htons(port);
  93         break;
  94     }
  95 }
  96
  97 const char *inet_strfamily(int family)
  98 {
  99     switch (family) {
 100     case PF_INET6: return "ipv6";
 101     case PF_INET:  return "ipv4";
 102     case PF_UNIX:  return "unix";
 103     }
 104     return "unknown";
 105 }
 106
 107 int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
 108 {
 109     struct addrinfo ai,*res,*e;
 110     const char *addr;
 111     char port[33];
 112     char uaddr[INET6_ADDRSTRLEN+1];
 113     char uport[33];
 114     int slisten, rc, to, port_min, port_max, p;
 115
 116     memset(&ai,0, sizeof(ai));
 117     ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
 118     ai.ai_family = PF_UNSPEC;
 119     ai.ai_socktype = SOCK_STREAM;
 120
 121     if ((qemu_opt_get(opts, "host") == NULL) ||
 122         (qemu_opt_get(opts, "port") == NULL)) {
 123         error_setg(errp, "host and/or port not specified");
 124         return -1;
 125     }
 126     pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
 127     addr = qemu_opt_get(opts, "host");
 128
 129     to = qemu_opt_get_number(opts, "to", 0);
 130     if (qemu_opt_get_bool(opts, "ipv4", 0))
 131         ai.ai_family = PF_INET;
 132     if (qemu_opt_get_bool(opts, "ipv6", 0))
 133         ai.ai_family = PF_INET6;
 134
 135     /* lookup */
 136     if (port_offset)
 137         snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
 138     rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
 139     if (rc != 0) {
 140         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 141                    gai_strerror(rc));
 142         return -1;
 143     }
 144
 145     /* create socket + bind */
 146     for (e = res; e != NULL; e = e->ai_next) {
 147         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 148                         uaddr,INET6_ADDRSTRLEN,uport,32,
 149                         NI_NUMERICHOST | NI_NUMERICSERV);
 150         slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 151         if (slisten < 0) {
 152             if (!e->ai_next) {
 153                 error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 154             }
 155             continue;
 156         }
 157
 158         socket_set_fast_reuse(slisten);
 159 #ifdef IPV6_V6ONLY
 160         if (e->ai_family == PF_INET6) {
 161             /* listen on both ipv4 and ipv6 */
 162             qemu_setsockopt(slisten, IPPROTO_IPV6, IPV6_V6ONLY, &off,
 163                             sizeof(off));
 164         }
 165 #endif
 166
 167         port_min = inet_getport(e);
 168         port_max = to ? to + port_offset : port_min;
 169         for (p = port_min; p <= port_max; p++) {
 170             inet_setport(e, p);
 171             if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
 172                 goto listen;
 173             }
 174             if (p == port_max) {
 175                 if (!e->ai_next) {
 176                     error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
 177                 }
 178             }
 179         }
 180         closesocket(slisten);
 181     }
 182     freeaddrinfo(res);
 183     return -1;
 184
 185 listen:
 186     if (listen(slisten,1) != 0) {
 187         error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
 188         closesocket(slisten);
 189         freeaddrinfo(res);
 190         return -1;
 191     }
 192     snprintf(uport, sizeof(uport), "%d", inet_getport(e) - port_offset);
 193     qemu_opt_set(opts, "host", uaddr);
 194     qemu_opt_set(opts, "port", uport);
 195     qemu_opt_set(opts, "ipv6", (e->ai_family == PF_INET6) ? "on" : "off");
 196     qemu_opt_set(opts, "ipv4", (e->ai_family != PF_INET6) ? "on" : "off");
 197     freeaddrinfo(res);
 198     return slisten;
 199 }
 200
 201 #ifdef _WIN32
 202 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 203     ((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
 204 #else
 205 #define QEMU_SOCKET_RC_INPROGRESS(rc) \
 206     ((rc) == -EINPROGRESS)
 207 #endif
 208
 209 /* Struct to store connect state for non blocking connect */
 210 typedef struct ConnectState {
 211     int fd;
 212     struct addrinfo *addr_list;
 213     struct addrinfo *current_addr;
 214     NonBlockingConnectHandler *callback;
 215     void *opaque;
 216 } ConnectState;
 217
 218 static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
 219                              ConnectState *connect_state, Error **errp);
 220
 221 static void wait_for_connect(void *opaque)
 222 {
 223     ConnectState *s = opaque;
 224     int val = 0, rc = 0;
 225     socklen_t valsize = sizeof(val);
 226     bool in_progress;
 227
 228     qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
 229
 230     do {
 231         rc = qemu_getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
 232     } while (rc == -1 && socket_error() == EINTR);
 233
 234     /* update rc to contain error */
 235     if (!rc && val) {
 236         rc = -1;
 237     }
 238
 239     /* connect error */
 240     if (rc < 0) {
 241         closesocket(s->fd);
 242         s->fd = rc;
 243     }
 244
 245     /* try to connect to the next address on the list */
 246     if (s->current_addr) {
 247         while (s->current_addr->ai_next != NULL && s->fd < 0) {
 248             s->current_addr = s->current_addr->ai_next;
 249             s->fd = inet_connect_addr(s->current_addr, &in_progress, s, NULL);
 250             /* connect in progress */
 251             if (in_progress) {
 252                 return;
 253             }
 254         }
 255
 256         freeaddrinfo(s->addr_list);
 257     }
 258
 259     if (s->callback) {
 260         s->callback(s->fd, s->opaque);
 261     }
 262     g_free(s);
 263 }
 264
 265 static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
 266                              ConnectState *connect_state, Error **errp)
 267 {
 268     int sock, rc;
 269
 270     *in_progress = false;
 271
 272     sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
 273     if (sock < 0) {
 274         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 275         return -1;
 276     }
 277     socket_set_fast_reuse(sock);
 278     if (connect_state != NULL) {
 279         qemu_set_nonblock(sock);
 280     }
 281     /* connect to peer */
 282     do {
 283         rc = 0;
 284         if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
 285             rc = -socket_error();
 286         }
 287     } while (rc == -EINTR);
 288
 289     if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
 290         connect_state->fd = sock;
 291         qemu_set_fd_handler2(sock, NULL, NULL, wait_for_connect,
 292                              connect_state);
 293         *in_progress = true;
 294     } else if (rc < 0) {
 295         error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
 296         closesocket(sock);
 297         return -1;
 298     }
 299     return sock;
 300 }
 301
 302 static struct addrinfo *inet_parse_connect_opts(QemuOpts *opts, Error **errp)
 303 {
 304     struct addrinfo ai, *res;
 305     int rc;
 306     const char *addr;
 307     const char *port;
 308
 309     memset(&ai, 0, sizeof(ai));
 310
 311     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 312     ai.ai_family = PF_UNSPEC;
 313     ai.ai_socktype = SOCK_STREAM;
 314
 315     addr = qemu_opt_get(opts, "host");
 316     port = qemu_opt_get(opts, "port");
 317     if (addr == NULL || port == NULL) {
 318         error_setg(errp, "host and/or port not specified");
 319         return NULL;
 320     }
 321
 322     if (qemu_opt_get_bool(opts, "ipv4", 0)) {
 323         ai.ai_family = PF_INET;
 324     }
 325     if (qemu_opt_get_bool(opts, "ipv6", 0)) {
 326         ai.ai_family = PF_INET6;
 327     }
 328
 329     /* lookup */
 330     rc = getaddrinfo(addr, port, &ai, &res);
 331     if (rc != 0) {
 332         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 333                    gai_strerror(rc));
 334         return NULL;
 335     }
 336     return res;
 337 }
 338
 339 /**
 340  * Create a socket and connect it to an address.
 341  *
 342  * @opts: QEMU options, recognized parameters strings "host" and "port",
 343  *        bools "ipv4" and "ipv6".
 344  * @errp: set on error
 345  * @callback: callback function for non-blocking connect
 346  * @opaque: opaque for callback function
 347  *
 348  * Returns: -1 on error, file descriptor on success.
 349  *
 350  * If @callback is non-null, the connect is non-blocking.  If this
 351  * function succeeds, callback will be called when the connection
 352  * completes, with the file descriptor on success, or -1 on error.
 353  */
 354 int inet_connect_opts(QemuOpts *opts, Error **errp,
 355                       NonBlockingConnectHandler *callback, void *opaque)
 356 {
 357     Error *local_err = NULL;
 358     struct addrinfo *res, *e;
 359     int sock = -1;
 360     bool in_progress;
 361     ConnectState *connect_state = NULL;
 362
 363     res = inet_parse_connect_opts(opts, errp);
 364     if (!res) {
 365         return -1;
 366     }
 367
 368     if (callback != NULL) {
 369         connect_state = g_malloc0(sizeof(*connect_state));
 370         connect_state->addr_list = res;
 371         connect_state->callback = callback;
 372         connect_state->opaque = opaque;
 373     }
 374
 375     for (e = res; e != NULL; e = e->ai_next) {
 376         error_free(local_err);
 377         local_err = NULL;
 378         if (connect_state != NULL) {
 379             connect_state->current_addr = e;
 380         }
 381         sock = inet_connect_addr(e, &in_progress, connect_state, &local_err);
 382         if (sock >= 0) {
 383             break;
 384         }
 385     }
 386
 387     if (sock < 0) {
 388         error_propagate(errp, local_err);
 389     } else if (in_progress) {
 390         /* wait_for_connect() will do the rest */
 391         return sock;
 392     } else {
 393         if (callback) {
 394             callback(sock, opaque);
 395         }
 396     }
 397     g_free(connect_state);
 398     freeaddrinfo(res);
 399     return sock;
 400 }
 401
 402 int inet_dgram_opts(QemuOpts *opts, Error **errp)
 403 {
 404     struct addrinfo ai, *peer = NULL, *local = NULL;
 405     const char *addr;
 406     const char *port;
 407     int sock = -1, rc;
 408
 409     /* lookup peer addr */
 410     memset(&ai,0, sizeof(ai));
 411     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 412     ai.ai_family = PF_UNSPEC;
 413     ai.ai_socktype = SOCK_DGRAM;
 414
 415     addr = qemu_opt_get(opts, "host");
 416     port = qemu_opt_get(opts, "port");
 417     if (addr == NULL || strlen(addr) == 0) {
 418         addr = "localhost";
 419     }
 420     if (port == NULL || strlen(port) == 0) {
 421         error_setg(errp, "remote port not specified");
 422         return -1;
 423     }
 424
 425     if (qemu_opt_get_bool(opts, "ipv4", 0))
 426         ai.ai_family = PF_INET;
 427     if (qemu_opt_get_bool(opts, "ipv6", 0))
 428         ai.ai_family = PF_INET6;
 429
 430     if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
 431         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 432                    gai_strerror(rc));
 433         return -1;
 434     }
 435
 436     /* lookup local addr */
 437     memset(&ai,0, sizeof(ai));
 438     ai.ai_flags = AI_PASSIVE;
 439     ai.ai_family = peer->ai_family;
 440     ai.ai_socktype = SOCK_DGRAM;
 441
 442     addr = qemu_opt_get(opts, "localaddr");
 443     port = qemu_opt_get(opts, "localport");
 444     if (addr == NULL || strlen(addr) == 0) {
 445         addr = NULL;
 446     }
 447     if (!port || strlen(port) == 0)
 448         port = "0";
 449
 450     if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
 451         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 452                    gai_strerror(rc));
 453         goto err;
 454     }
 455
 456     /* create socket */
 457     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 458     if (sock < 0) {
 459         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 460         goto err;
 461     }
 462     socket_set_fast_reuse(sock);
 463
 464     /* bind socket */
 465     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 466         error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
 467         goto err;
 468     }
 469
 470     /* connect to peer */
 471     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 472         error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
 473         goto err;
 474     }
 475
 476     freeaddrinfo(local);
 477     freeaddrinfo(peer);
 478     return sock;
 479
 480 err:
 481     if (-1 != sock)
 482         closesocket(sock);
 483     if (local)
 484         freeaddrinfo(local);
 485     if (peer)
 486         freeaddrinfo(peer);
 487     return -1;
 488 }
 489
 490 /* compatibility wrapper */
 491 InetSocketAddress *inet_parse(const char *str, Error **errp)
 492 {
 493     InetSocketAddress *addr;
 494     const char *optstr, *h;
 495     char host[64];
 496     char port[33];
 497     int to;
 498     int pos;
 499
 500     addr = g_new0(InetSocketAddress, 1);
 501
 502     /* parse address */
 503     if (str[0] == ':') {
 504         /* no host given */
 505         host[0] = '\0';
 506         if (1 != sscanf(str, ":%32[^,]%n", port, &pos)) {
 507             error_setg(errp, "error parsing port in address '%s'", str);
 508             goto fail;
 509         }
 510     } else if (str[0] == '[') {
 511         /* IPv6 addr */
 512         if (2 != sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos)) {
 513             error_setg(errp, "error parsing IPv6 address '%s'", str);
 514             goto fail;
 515         }
 516         addr->ipv6 = addr->has_ipv6 = true;
 517     } else {
 518         /* hostname or IPv4 addr */
 519         if (2 != sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos)) {
 520             error_setg(errp, "error parsing address '%s'", str);
 521             goto fail;
 522         }
 523         if (host[strspn(host, "0123456789.")] == '\0') {
 524             addr->ipv4 = addr->has_ipv4 = true;
 525         }
 526     }
 527
 528     addr->host = g_strdup(host);
 529     addr->port = g_strdup(port);
 530
 531     /* parse options */
 532     optstr = str + pos;
 533     h = strstr(optstr, ",to=");
 534     if (h) {
 535         h += 4;
 536         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 537             (h[pos] != '\0' && h[pos] != ',')) {
 538             error_setg(errp, "error parsing to= argument");
 539             goto fail;
 540         }
 541         addr->has_to = true;
 542         addr->to = to;
 543     }
 544     if (strstr(optstr, ",ipv4")) {
 545         addr->ipv4 = addr->has_ipv4 = true;
 546     }
 547     if (strstr(optstr, ",ipv6")) {
 548         addr->ipv6 = addr->has_ipv6 = true;
 549     }
 550     return addr;
 551
 552 fail:
 553     qapi_free_InetSocketAddress(addr);
 554     return NULL;
 555 }
 556
 557 static void inet_addr_to_opts(QemuOpts *opts, const InetSocketAddress *addr)
 558 {
 559     bool ipv4 = addr->ipv4 || !addr->has_ipv4;
 560     bool ipv6 = addr->ipv6 || !addr->has_ipv6;
 561
 562     if (!ipv4 || !ipv6) {
 563         qemu_opt_set_bool(opts, "ipv4", ipv4);
 564         qemu_opt_set_bool(opts, "ipv6", ipv6);
 565     }
 566     if (addr->has_to) {
 567         char to[20];
 568         snprintf(to, sizeof(to), "%d", addr->to);
 569         qemu_opt_set(opts, "to", to);
 570     }
 571     qemu_opt_set(opts, "host", addr->host);
 572     qemu_opt_set(opts, "port", addr->port);
 573 }
 574
 575 int inet_listen(const char *str, char *ostr, int olen,
 576                 int socktype, int port_offset, Error **errp)
 577 {
 578     QemuOpts *opts;
 579     char *optstr;
 580     int sock = -1;
 581     InetSocketAddress *addr;
 582
 583     addr = inet_parse(str, errp);
 584     if (addr != NULL) {
 585         opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 586         inet_addr_to_opts(opts, addr);
 587         qapi_free_InetSocketAddress(addr);
 588         sock = inet_listen_opts(opts, port_offset, errp);
 589         if (sock != -1 && ostr) {
 590             optstr = strchr(str, ',');
 591             if (qemu_opt_get_bool(opts, "ipv6", 0)) {
 592                 snprintf(ostr, olen, "[%s]:%s%s",
 593                          qemu_opt_get(opts, "host"),
 594                          qemu_opt_get(opts, "port"),
 595                          optstr ? optstr : "");
 596             } else {
 597                 snprintf(ostr, olen, "%s:%s%s",
 598                          qemu_opt_get(opts, "host"),
 599                          qemu_opt_get(opts, "port"),
 600                          optstr ? optstr : "");
 601             }
 602         }
 603         qemu_opts_del(opts);
 604     }
 605     return sock;
 606 }
 607
 608 /**
 609  * Create a blocking socket and connect it to an address.
 610  *
 611  * @str: address string
 612  * @errp: set in case of an error
 613  *
 614  * Returns -1 in case of error, file descriptor on success
 615  **/
 616 int inet_connect(const char *str, Error **errp)
 617 {
 618     QemuOpts *opts;
 619     int sock = -1;
 620     InetSocketAddress *addr;
 621
 622     addr = inet_parse(str, errp);
 623     if (addr != NULL) {
 624         opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 625         inet_addr_to_opts(opts, addr);
 626         qapi_free_InetSocketAddress(addr);
 627         sock = inet_connect_opts(opts, errp, NULL, NULL);
 628         qemu_opts_del(opts);
 629     }
 630     return sock;
 631 }
 632
 633 /**
 634  * Create a non-blocking socket and connect it to an address.
 635  * Calls the callback function with fd in case of success or -1 in case of
 636  * error.
 637  *
 638  * @str: address string
 639  * @callback: callback function that is called when connect completes,
 640  *            cannot be NULL.
 641  * @opaque: opaque for callback function
 642  * @errp: set in case of an error
 643  *
 644  * Returns: -1 on immediate error, file descriptor on success.
 645  **/
 646 int inet_nonblocking_connect(const char *str,
 647                              NonBlockingConnectHandler *callback,
 648                              void *opaque, Error **errp)
 649 {
 650     QemuOpts *opts;
 651     int sock = -1;
 652     InetSocketAddress *addr;
 653
 654     g_assert(callback != NULL);
 655
 656     addr = inet_parse(str, errp);
 657     if (addr != NULL) {
 658         opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 659         inet_addr_to_opts(opts, addr);
 660         qapi_free_InetSocketAddress(addr);
 661         sock = inet_connect_opts(opts, errp, callback, opaque);
 662         qemu_opts_del(opts);
 663     }
 664     return sock;
 665 }
 666
 667 #ifndef _WIN32
 668
 669 int unix_listen_opts(QemuOpts *opts, Error **errp)
 670 {
 671     struct sockaddr_un un;
 672     const char *path = qemu_opt_get(opts, "path");
 673     int sock, fd;
 674
 675     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 676     if (sock < 0) {
 677         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 678         return -1;
 679     }
 680
 681     memset(&un, 0, sizeof(un));
 682     un.sun_family = AF_UNIX;
 683     if (path && strlen(path)) {
 684         snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 685     } else {
 686         char *tmpdir = getenv("TMPDIR");
 687         snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
 688                  tmpdir ? tmpdir : "/tmp");
 689         /*
 690          * This dummy fd usage silences the mktemp() unsecure warning.
 691          * Using mkstemp() doesn't make things more secure here
 692          * though.  bind() complains about existing files, so we have
 693          * to unlink first and thus re-open the race window.  The
 694          * worst case possible is bind() failing, i.e. a DoS attack.
 695          */
 696         fd = mkstemp(un.sun_path); close(fd);
 697         qemu_opt_set(opts, "path", un.sun_path);
 698     }
 699
 700     unlink(un.sun_path);
 701     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 702         error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
 703         goto err;
 704     }
 705     if (listen(sock, 1) < 0) {
 706         error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
 707         goto err;
 708     }
 709
 710     return sock;
 711
 712 err:
 713     closesocket(sock);
 714     return -1;
 715 }
 716
 717 int unix_connect_opts(QemuOpts *opts, Error **errp,
 718                       NonBlockingConnectHandler *callback, void *opaque)
 719 {
 720     struct sockaddr_un un;
 721     const char *path = qemu_opt_get(opts, "path");
 722     ConnectState *connect_state = NULL;
 723     int sock, rc;
 724
 725     if (NULL == path) {
 726         error_setg(errp, "unix connect: no path specified");
 727         return -1;
 728     }
 729
 730     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 731     if (sock < 0) {
 732         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 733         return -1;
 734     }
 735     if (callback != NULL) {
 736         connect_state = g_malloc0(sizeof(*connect_state));
 737         connect_state->callback = callback;
 738         connect_state->opaque = opaque;
 739         qemu_set_nonblock(sock);
 740     }
 741
 742     memset(&un, 0, sizeof(un));
 743     un.sun_family = AF_UNIX;
 744     snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 745
 746     /* connect to peer */
 747     do {
 748         rc = 0;
 749         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 750             rc = -socket_error();
 751         }
 752     } while (rc == -EINTR);
 753
 754     if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
 755         connect_state->fd = sock;
 756         qemu_set_fd_handler2(sock, NULL, NULL, wait_for_connect,
 757                              connect_state);
 758         return sock;
 759     } else if (rc >= 0) {
 760         /* non blocking socket immediate success, call callback */
 761         if (callback != NULL) {
 762             callback(sock, opaque);
 763         }
 764     }
 765
 766     if (rc < 0) {
 767         error_set_errno(errp, -rc, QERR_SOCKET_CONNECT_FAILED);
 768         close(sock);
 769         sock = -1;
 770     }
 771
 772     g_free(connect_state);
 773     return sock;
 774 }
 775
 776 #else
 777
 778 int unix_listen_opts(QemuOpts *opts, Error **errp)
 779 {
 780     error_setg(errp, "unix sockets are not available on windows");
 781     errno = ENOTSUP;
 782     return -1;
 783 }
 784
 785 int unix_connect_opts(QemuOpts *opts, Error **errp,
 786                       NonBlockingConnectHandler *callback, void *opaque)
 787 {
 788     error_setg(errp, "unix sockets are not available on windows");
 789     errno = ENOTSUP;
 790     return -1;
 791 }
 792 #endif
 793
 794 /* compatibility wrapper */
 795 int unix_listen(const char *str, char *ostr, int olen, Error **errp)
 796 {
 797     QemuOpts *opts;
 798     char *path, *optstr;
 799     int sock, len;
 800
 801     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 802
 803     optstr = strchr(str, ',');
 804     if (optstr) {
 805         len = optstr - str;
 806         if (len) {
 807             path = g_malloc(len+1);
 808             snprintf(path, len+1, "%.*s", len, str);
 809             qemu_opt_set(opts, "path", path);
 810             g_free(path);
 811         }
 812     } else {
 813         qemu_opt_set(opts, "path", str);
 814     }
 815
 816     sock = unix_listen_opts(opts, errp);
 817
 818     if (sock != -1 && ostr)
 819         snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
 820     qemu_opts_del(opts);
 821     return sock;
 822 }
 823
 824 int unix_connect(const char *path, Error **errp)
 825 {
 826     QemuOpts *opts;
 827     int sock;
 828
 829     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 830     qemu_opt_set(opts, "path", path);
 831     sock = unix_connect_opts(opts, errp, NULL, NULL);
 832     qemu_opts_del(opts);
 833     return sock;
 834 }
 835
 836
 837 int unix_nonblocking_connect(const char *path,
 838                              NonBlockingConnectHandler *callback,
 839                              void *opaque, Error **errp)
 840 {
 841     QemuOpts *opts;
 842     int sock = -1;
 843
 844     g_assert(callback != NULL);
 845
 846     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 847     qemu_opt_set(opts, "path", path);
 848     sock = unix_connect_opts(opts, errp, callback, opaque);
 849     qemu_opts_del(opts);
 850     return sock;
 851 }
 852
 853 SocketAddress *socket_parse(const char *str, Error **errp)
 854 {
 855     SocketAddress *addr;
 856
 857     addr = g_new0(SocketAddress, 1);
 858     if (strstart(str, "unix:", NULL)) {
 859         if (str[5] == '\0') {
 860             error_setg(errp, "invalid Unix socket address");
 861             goto fail;
 862         } else {
 863             addr->kind = SOCKET_ADDRESS_KIND_UNIX;
 864             addr->q_unix = g_new(UnixSocketAddress, 1);
 865             addr->q_unix->path = g_strdup(str + 5);
 866         }
 867     } else if (strstart(str, "fd:", NULL)) {
 868         if (str[3] == '\0') {
 869             error_setg(errp, "invalid file descriptor address");
 870             goto fail;
 871         } else {
 872             addr->kind = SOCKET_ADDRESS_KIND_FD;
 873             addr->fd = g_new(String, 1);
 874             addr->fd->str = g_strdup(str + 3);
 875         }
 876     } else {
 877         addr->kind = SOCKET_ADDRESS_KIND_INET;
 878         addr->inet = inet_parse(str, errp);
 879         if (addr->inet == NULL) {
 880             goto fail;
 881         }
 882     }
 883     return addr;
 884
 885 fail:
 886     qapi_free_SocketAddress(addr);
 887     return NULL;
 888 }
 889
 890 int socket_connect(SocketAddress *addr, Error **errp,
 891                    NonBlockingConnectHandler *callback, void *opaque)
 892 {
 893     QemuOpts *opts;
 894     int fd;
 895
 896     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 897     switch (addr->kind) {
 898     case SOCKET_ADDRESS_KIND_INET:
 899         inet_addr_to_opts(opts, addr->inet);
 900         fd = inet_connect_opts(opts, errp, callback, opaque);
 901         break;
 902
 903     case SOCKET_ADDRESS_KIND_UNIX:
 904         qemu_opt_set(opts, "path", addr->q_unix->path);
 905         fd = unix_connect_opts(opts, errp, callback, opaque);
 906         break;
 907
 908     case SOCKET_ADDRESS_KIND_FD:
 909         fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
 910         if (fd >= 0 && callback) {
 911             qemu_set_nonblock(fd);
 912             callback(fd, opaque);
 913         }
 914         break;
 915
 916     default:
 917         abort();
 918     }
 919     qemu_opts_del(opts);
 920     return fd;
 921 }
 922
 923 int socket_listen(SocketAddress *addr, Error **errp)
 924 {
 925     QemuOpts *opts;
 926     int fd;
 927
 928     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 929     switch (addr->kind) {
 930     case SOCKET_ADDRESS_KIND_INET:
 931         inet_addr_to_opts(opts, addr->inet);
 932         fd = inet_listen_opts(opts, 0, errp);
 933         break;
 934
 935     case SOCKET_ADDRESS_KIND_UNIX:
 936         qemu_opt_set(opts, "path", addr->q_unix->path);
 937         fd = unix_listen_opts(opts, errp);
 938         break;
 939
 940     case SOCKET_ADDRESS_KIND_FD:
 941         fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
 942         break;
 943
 944     default:
 945         abort();
 946     }
 947     qemu_opts_del(opts);
 948     return fd;
 949 }
 950
 951 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
 952 {
 953     QemuOpts *opts;
 954     int fd;
 955
 956     opts = qemu_opts_create(&socket_optslist, NULL, 0, &error_abort);
 957     switch (remote->kind) {
 958     case SOCKET_ADDRESS_KIND_INET:
 959         qemu_opt_set(opts, "host", remote->inet->host);
 960         qemu_opt_set(opts, "port", remote->inet->port);
 961         if (local) {
 962             qemu_opt_set(opts, "localaddr", local->inet->host);
 963             qemu_opt_set(opts, "localport", local->inet->port);
 964         }
 965         fd = inet_dgram_opts(opts, errp);
 966         break;
 967
 968     default:
 969         error_setg(errp, "socket type unsupported for datagram");
 970         fd = -1;
 971     }
 972     qemu_opts_del(opts);
 973     return fd;
 974 }