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         qemu_setsockopt(slisten, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 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     qemu_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 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     struct addrinfo *res, *e;
 358     int sock = -1;
 359     bool in_progress;
 360     ConnectState *connect_state = NULL;
 361
 362     res = inet_parse_connect_opts(opts, errp);
 363     if (!res) {
 364         return -1;
 365     }
 366
 367     if (callback != NULL) {
 368         connect_state = g_malloc0(sizeof(*connect_state));
 369         connect_state->addr_list = res;
 370         connect_state->callback = callback;
 371         connect_state->opaque = opaque;
 372     }
 373
 374     for (e = res; e != NULL; e = e->ai_next) {
 375         if (error_is_set(errp)) {
 376             error_free(*errp);
 377             *errp = NULL;
 378         }
 379         if (connect_state != NULL) {
 380             connect_state->current_addr = e;
 381         }
 382         sock = inet_connect_addr(e, &in_progress, connect_state, errp);
 383         if (in_progress) {
 384             return sock;
 385         } else if (sock >= 0) {
 386             /* non blocking socket immediate success, call callback */
 387             if (callback != NULL) {
 388                 callback(sock, opaque);
 389             }
 390             break;
 391         }
 392     }
 393     g_free(connect_state);
 394     freeaddrinfo(res);
 395     return sock;
 396 }
 397
 398 int inet_dgram_opts(QemuOpts *opts, Error **errp)
 399 {
 400     struct addrinfo ai, *peer = NULL, *local = NULL;
 401     const char *addr;
 402     const char *port;
 403     int sock = -1, rc;
 404
 405     /* lookup peer addr */
 406     memset(&ai,0, sizeof(ai));
 407     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 408     ai.ai_family = PF_UNSPEC;
 409     ai.ai_socktype = SOCK_DGRAM;
 410
 411     addr = qemu_opt_get(opts, "host");
 412     port = qemu_opt_get(opts, "port");
 413     if (addr == NULL || strlen(addr) == 0) {
 414         addr = "localhost";
 415     }
 416     if (port == NULL || strlen(port) == 0) {
 417         error_setg(errp, "remote port not specified");
 418         return -1;
 419     }
 420
 421     if (qemu_opt_get_bool(opts, "ipv4", 0))
 422         ai.ai_family = PF_INET;
 423     if (qemu_opt_get_bool(opts, "ipv6", 0))
 424         ai.ai_family = PF_INET6;
 425
 426     if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
 427         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 428                    gai_strerror(rc));
 429         return -1;
 430     }
 431
 432     /* lookup local addr */
 433     memset(&ai,0, sizeof(ai));
 434     ai.ai_flags = AI_PASSIVE;
 435     ai.ai_family = peer->ai_family;
 436     ai.ai_socktype = SOCK_DGRAM;
 437
 438     addr = qemu_opt_get(opts, "localaddr");
 439     port = qemu_opt_get(opts, "localport");
 440     if (addr == NULL || strlen(addr) == 0) {
 441         addr = NULL;
 442     }
 443     if (!port || strlen(port) == 0)
 444         port = "0";
 445
 446     if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
 447         error_setg(errp, "address resolution failed for %s:%s: %s", addr, port,
 448                    gai_strerror(rc));
 449         goto err;
 450     }
 451
 452     /* create socket */
 453     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 454     if (sock < 0) {
 455         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 456         goto err;
 457     }
 458     qemu_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
 459
 460     /* bind socket */
 461     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 462         error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
 463         goto err;
 464     }
 465
 466     /* connect to peer */
 467     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 468         error_set_errno(errp, errno, QERR_SOCKET_CONNECT_FAILED);
 469         goto err;
 470     }
 471
 472     freeaddrinfo(local);
 473     freeaddrinfo(peer);
 474     return sock;
 475
 476 err:
 477     if (-1 != sock)
 478         closesocket(sock);
 479     if (local)
 480         freeaddrinfo(local);
 481     if (peer)
 482         freeaddrinfo(peer);
 483     return -1;
 484 }
 485
 486 /* compatibility wrapper */
 487 InetSocketAddress *inet_parse(const char *str, Error **errp)
 488 {
 489     InetSocketAddress *addr;
 490     const char *optstr, *h;
 491     char host[64];
 492     char port[33];
 493     int to;
 494     int pos;
 495
 496     addr = g_new0(InetSocketAddress, 1);
 497
 498     /* parse address */
 499     if (str[0] == ':') {
 500         /* no host given */
 501         host[0] = '\0';
 502         if (1 != sscanf(str, ":%32[^,]%n", port, &pos)) {
 503             error_setg(errp, "error parsing port in address '%s'", str);
 504             goto fail;
 505         }
 506     } else if (str[0] == '[') {
 507         /* IPv6 addr */
 508         if (2 != sscanf(str, "[%64[^]]]:%32[^,]%n", host, port, &pos)) {
 509             error_setg(errp, "error parsing IPv6 address '%s'", str);
 510             goto fail;
 511         }
 512         addr->ipv6 = addr->has_ipv6 = true;
 513     } else {
 514         /* hostname or IPv4 addr */
 515         if (2 != sscanf(str, "%64[^:]:%32[^,]%n", host, port, &pos)) {
 516             error_setg(errp, "error parsing address '%s'", str);
 517             goto fail;
 518         }
 519         if (host[strspn(host, "0123456789.")] == '\0') {
 520             addr->ipv4 = addr->has_ipv4 = true;
 521         }
 522     }
 523
 524     addr->host = g_strdup(host);
 525     addr->port = g_strdup(port);
 526
 527     /* parse options */
 528     optstr = str + pos;
 529     h = strstr(optstr, ",to=");
 530     if (h) {
 531         h += 4;
 532         if (sscanf(h, "%d%n", &to, &pos) != 1 ||
 533             (h[pos] != '\0' && h[pos] != ',')) {
 534             error_setg(errp, "error parsing to= argument");
 535             goto fail;
 536         }
 537         addr->has_to = true;
 538         addr->to = to;
 539     }
 540     if (strstr(optstr, ",ipv4")) {
 541         addr->ipv4 = addr->has_ipv4 = true;
 542     }
 543     if (strstr(optstr, ",ipv6")) {
 544         addr->ipv6 = addr->has_ipv6 = true;
 545     }
 546     return addr;
 547
 548 fail:
 549     qapi_free_InetSocketAddress(addr);
 550     return NULL;
 551 }
 552
 553 static void inet_addr_to_opts(QemuOpts *opts, const InetSocketAddress *addr)
 554 {
 555     bool ipv4 = addr->ipv4 || !addr->has_ipv4;
 556     bool ipv6 = addr->ipv6 || !addr->has_ipv6;
 557
 558     if (!ipv4 || !ipv6) {
 559         qemu_opt_set_bool(opts, "ipv4", ipv4);
 560         qemu_opt_set_bool(opts, "ipv6", ipv6);
 561     }
 562     if (addr->has_to) {
 563         char to[20];
 564         snprintf(to, sizeof(to), "%d", addr->to);
 565         qemu_opt_set(opts, "to", to);
 566     }
 567     qemu_opt_set(opts, "host", addr->host);
 568     qemu_opt_set(opts, "port", addr->port);
 569 }
 570
 571 int inet_listen(const char *str, char *ostr, int olen,
 572                 int socktype, int port_offset, Error **errp)
 573 {
 574     QemuOpts *opts;
 575     char *optstr;
 576     int sock = -1;
 577     InetSocketAddress *addr;
 578
 579     addr = inet_parse(str, errp);
 580     if (addr != NULL) {
 581         opts = qemu_opts_create_nofail(&socket_optslist);
 582         inet_addr_to_opts(opts, addr);
 583         qapi_free_InetSocketAddress(addr);
 584         sock = inet_listen_opts(opts, port_offset, errp);
 585         if (sock != -1 && ostr) {
 586             optstr = strchr(str, ',');
 587             if (qemu_opt_get_bool(opts, "ipv6", 0)) {
 588                 snprintf(ostr, olen, "[%s]:%s%s",
 589                          qemu_opt_get(opts, "host"),
 590                          qemu_opt_get(opts, "port"),
 591                          optstr ? optstr : "");
 592             } else {
 593                 snprintf(ostr, olen, "%s:%s%s",
 594                          qemu_opt_get(opts, "host"),
 595                          qemu_opt_get(opts, "port"),
 596                          optstr ? optstr : "");
 597             }
 598         }
 599         qemu_opts_del(opts);
 600     }
 601     return sock;
 602 }
 603
 604 /**
 605  * Create a blocking socket and connect it to an address.
 606  *
 607  * @str: address string
 608  * @errp: set in case of an error
 609  *
 610  * Returns -1 in case of error, file descriptor on success
 611  **/
 612 int inet_connect(const char *str, Error **errp)
 613 {
 614     QemuOpts *opts;
 615     int sock = -1;
 616     InetSocketAddress *addr;
 617
 618     addr = inet_parse(str, errp);
 619     if (addr != NULL) {
 620         opts = qemu_opts_create_nofail(&socket_optslist);
 621         inet_addr_to_opts(opts, addr);
 622         qapi_free_InetSocketAddress(addr);
 623         sock = inet_connect_opts(opts, errp, NULL, NULL);
 624         qemu_opts_del(opts);
 625     }
 626     return sock;
 627 }
 628
 629 /**
 630  * Create a non-blocking socket and connect it to an address.
 631  * Calls the callback function with fd in case of success or -1 in case of
 632  * error.
 633  *
 634  * @str: address string
 635  * @callback: callback function that is called when connect completes,
 636  *            cannot be NULL.
 637  * @opaque: opaque for callback function
 638  * @errp: set in case of an error
 639  *
 640  * Returns: -1 on immediate error, file descriptor on success.
 641  **/
 642 int inet_nonblocking_connect(const char *str,
 643                              NonBlockingConnectHandler *callback,
 644                              void *opaque, Error **errp)
 645 {
 646     QemuOpts *opts;
 647     int sock = -1;
 648     InetSocketAddress *addr;
 649
 650     g_assert(callback != NULL);
 651
 652     addr = inet_parse(str, errp);
 653     if (addr != NULL) {
 654         opts = qemu_opts_create_nofail(&socket_optslist);
 655         inet_addr_to_opts(opts, addr);
 656         qapi_free_InetSocketAddress(addr);
 657         sock = inet_connect_opts(opts, errp, callback, opaque);
 658         qemu_opts_del(opts);
 659     }
 660     return sock;
 661 }
 662
 663 #ifndef _WIN32
 664
 665 int unix_listen_opts(QemuOpts *opts, Error **errp)
 666 {
 667     struct sockaddr_un un;
 668     const char *path = qemu_opt_get(opts, "path");
 669     int sock, fd;
 670
 671     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 672     if (sock < 0) {
 673         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 674         return -1;
 675     }
 676
 677     memset(&un, 0, sizeof(un));
 678     un.sun_family = AF_UNIX;
 679     if (path && strlen(path)) {
 680         snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 681     } else {
 682         char *tmpdir = getenv("TMPDIR");
 683         snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
 684                  tmpdir ? tmpdir : "/tmp");
 685         /*
 686          * This dummy fd usage silences the mktemp() unsecure warning.
 687          * Using mkstemp() doesn't make things more secure here
 688          * though.  bind() complains about existing files, so we have
 689          * to unlink first and thus re-open the race window.  The
 690          * worst case possible is bind() failing, i.e. a DoS attack.
 691          */
 692         fd = mkstemp(un.sun_path); close(fd);
 693         qemu_opt_set(opts, "path", un.sun_path);
 694     }
 695
 696     unlink(un.sun_path);
 697     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 698         error_set_errno(errp, errno, QERR_SOCKET_BIND_FAILED);
 699         goto err;
 700     }
 701     if (listen(sock, 1) < 0) {
 702         error_set_errno(errp, errno, QERR_SOCKET_LISTEN_FAILED);
 703         goto err;
 704     }
 705
 706     return sock;
 707
 708 err:
 709     closesocket(sock);
 710     return -1;
 711 }
 712
 713 int unix_connect_opts(QemuOpts *opts, Error **errp,
 714                       NonBlockingConnectHandler *callback, void *opaque)
 715 {
 716     struct sockaddr_un un;
 717     const char *path = qemu_opt_get(opts, "path");
 718     ConnectState *connect_state = NULL;
 719     int sock, rc;
 720
 721     if (NULL == path) {
 722         error_setg(errp, "unix connect: no path specified");
 723         return -1;
 724     }
 725
 726     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 727     if (sock < 0) {
 728         error_set_errno(errp, errno, QERR_SOCKET_CREATE_FAILED);
 729         return -1;
 730     }
 731     if (callback != NULL) {
 732         connect_state = g_malloc0(sizeof(*connect_state));
 733         connect_state->callback = callback;
 734         connect_state->opaque = opaque;
 735         qemu_set_nonblock(sock);
 736     }
 737
 738     memset(&un, 0, sizeof(un));
 739     un.sun_family = AF_UNIX;
 740     snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 741
 742     /* connect to peer */
 743     do {
 744         rc = 0;
 745         if (connect(sock, (struct sockaddr *) &un, sizeof(un)) < 0) {
 746             rc = -socket_error();
 747         }
 748     } while (rc == -EINTR);
 749
 750     if (connect_state != NULL && QEMU_SOCKET_RC_INPROGRESS(rc)) {
 751         connect_state->fd = sock;
 752         qemu_set_fd_handler2(sock, NULL, NULL, wait_for_connect,
 753                              connect_state);
 754         return sock;
 755     } else if (rc >= 0) {
 756         /* non blocking socket immediate success, call callback */
 757         if (callback != NULL) {
 758             callback(sock, opaque);
 759         }
 760     }
 761
 762     if (rc < 0) {
 763         error_set_errno(errp, -rc, QERR_SOCKET_CONNECT_FAILED);
 764         close(sock);
 765         sock = -1;
 766     }
 767
 768     g_free(connect_state);
 769     return sock;
 770 }
 771
 772 #else
 773
 774 int unix_listen_opts(QemuOpts *opts, Error **errp)
 775 {
 776     error_setg(errp, "unix sockets are not available on windows");
 777     errno = ENOTSUP;
 778     return -1;
 779 }
 780
 781 int unix_connect_opts(QemuOpts *opts, Error **errp,
 782                       NonBlockingConnectHandler *callback, void *opaque)
 783 {
 784     error_setg(errp, "unix sockets are not available on windows");
 785     errno = ENOTSUP;
 786     return -1;
 787 }
 788 #endif
 789
 790 /* compatibility wrapper */
 791 int unix_listen(const char *str, char *ostr, int olen, Error **errp)
 792 {
 793     QemuOpts *opts;
 794     char *path, *optstr;
 795     int sock, len;
 796
 797     opts = qemu_opts_create_nofail(&socket_optslist);
 798
 799     optstr = strchr(str, ',');
 800     if (optstr) {
 801         len = optstr - str;
 802         if (len) {
 803             path = g_malloc(len+1);
 804             snprintf(path, len+1, "%.*s", len, str);
 805             qemu_opt_set(opts, "path", path);
 806             g_free(path);
 807         }
 808     } else {
 809         qemu_opt_set(opts, "path", str);
 810     }
 811
 812     sock = unix_listen_opts(opts, errp);
 813
 814     if (sock != -1 && ostr)
 815         snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
 816     qemu_opts_del(opts);
 817     return sock;
 818 }
 819
 820 int unix_connect(const char *path, Error **errp)
 821 {
 822     QemuOpts *opts;
 823     int sock;
 824
 825     opts = qemu_opts_create_nofail(&socket_optslist);
 826     qemu_opt_set(opts, "path", path);
 827     sock = unix_connect_opts(opts, errp, NULL, NULL);
 828     qemu_opts_del(opts);
 829     return sock;
 830 }
 831
 832
 833 int unix_nonblocking_connect(const char *path,
 834                              NonBlockingConnectHandler *callback,
 835                              void *opaque, Error **errp)
 836 {
 837     QemuOpts *opts;
 838     int sock = -1;
 839
 840     g_assert(callback != NULL);
 841
 842     opts = qemu_opts_create_nofail(&socket_optslist);
 843     qemu_opt_set(opts, "path", path);
 844     sock = unix_connect_opts(opts, errp, callback, opaque);
 845     qemu_opts_del(opts);
 846     return sock;
 847 }
 848
 849 SocketAddress *socket_parse(const char *str, Error **errp)
 850 {
 851     SocketAddress *addr;
 852
 853     addr = g_new0(SocketAddress, 1);
 854     if (strstart(str, "unix:", NULL)) {
 855         if (str[5] == '\0') {
 856             error_setg(errp, "invalid Unix socket address");
 857             goto fail;
 858         } else {
 859             addr->kind = SOCKET_ADDRESS_KIND_UNIX;
 860             addr->q_unix = g_new(UnixSocketAddress, 1);
 861             addr->q_unix->path = g_strdup(str + 5);
 862         }
 863     } else if (strstart(str, "fd:", NULL)) {
 864         if (str[3] == '\0') {
 865             error_setg(errp, "invalid file descriptor address");
 866             goto fail;
 867         } else {
 868             addr->kind = SOCKET_ADDRESS_KIND_FD;
 869             addr->fd = g_new(String, 1);
 870             addr->fd->str = g_strdup(str + 3);
 871         }
 872     } else {
 873         addr->kind = SOCKET_ADDRESS_KIND_INET;
 874         addr->inet = inet_parse(str, errp);
 875         if (addr->inet == NULL) {
 876             goto fail;
 877         }
 878     }
 879     return addr;
 880
 881 fail:
 882     qapi_free_SocketAddress(addr);
 883     return NULL;
 884 }
 885
 886 int socket_connect(SocketAddress *addr, Error **errp,
 887                    NonBlockingConnectHandler *callback, void *opaque)
 888 {
 889     QemuOpts *opts;
 890     int fd;
 891
 892     opts = qemu_opts_create_nofail(&socket_optslist);
 893     switch (addr->kind) {
 894     case SOCKET_ADDRESS_KIND_INET:
 895         inet_addr_to_opts(opts, addr->inet);
 896         fd = inet_connect_opts(opts, errp, callback, opaque);
 897         break;
 898
 899     case SOCKET_ADDRESS_KIND_UNIX:
 900         qemu_opt_set(opts, "path", addr->q_unix->path);
 901         fd = unix_connect_opts(opts, errp, callback, opaque);
 902         break;
 903
 904     case SOCKET_ADDRESS_KIND_FD:
 905         fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
 906         if (fd >= 0 && callback) {
 907             qemu_set_nonblock(fd);
 908             callback(fd, opaque);
 909         }
 910         break;
 911
 912     default:
 913         abort();
 914     }
 915     qemu_opts_del(opts);
 916     return fd;
 917 }
 918
 919 int socket_listen(SocketAddress *addr, Error **errp)
 920 {
 921     QemuOpts *opts;
 922     int fd;
 923
 924     opts = qemu_opts_create_nofail(&socket_optslist);
 925     switch (addr->kind) {
 926     case SOCKET_ADDRESS_KIND_INET:
 927         inet_addr_to_opts(opts, addr->inet);
 928         fd = inet_listen_opts(opts, 0, errp);
 929         break;
 930
 931     case SOCKET_ADDRESS_KIND_UNIX:
 932         qemu_opt_set(opts, "path", addr->q_unix->path);
 933         fd = unix_listen_opts(opts, errp);
 934         break;
 935
 936     case SOCKET_ADDRESS_KIND_FD:
 937         fd = monitor_get_fd(cur_mon, addr->fd->str, errp);
 938         break;
 939
 940     default:
 941         abort();
 942     }
 943     qemu_opts_del(opts);
 944     return fd;
 945 }
 946
 947 int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)
 948 {
 949     QemuOpts *opts;
 950     int fd;
 951
 952     opts = qemu_opts_create_nofail(&socket_optslist);
 953     switch (remote->kind) {
 954     case SOCKET_ADDRESS_KIND_INET:
 955         qemu_opt_set(opts, "host", remote->inet->host);
 956         qemu_opt_set(opts, "port", remote->inet->port);
 957         if (local) {
 958             qemu_opt_set(opts, "localaddr", local->inet->host);
 959             qemu_opt_set(opts, "localport", local->inet->port);
 960         }
 961         fd = inet_dgram_opts(opts, errp);
 962         break;
 963
 964     default:
 965         error_setg(errp, "socket type unsupported for datagram");
 966         fd = -1;
 967     }
 968     qemu_opts_del(opts);
 969     return fd;
 970 }