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 "qemu_socket.h"
  26 #include "qemu-common.h" /* for qemu_isdigit */
  27
  28 #ifndef AI_ADDRCONFIG
  29 # define AI_ADDRCONFIG 0
  30 #endif
  31
  32 static const int on=1, off=0;
  33
  34 /* used temporarely until all users are converted to QemuOpts */
  35 static QemuOptsList dummy_opts = {
  36     .name = "dummy",
  37     .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head),
  38     .desc = {
  39         {
  40             .name = "path",
  41             .type = QEMU_OPT_STRING,
  42         },{
  43             .name = "host",
  44             .type = QEMU_OPT_STRING,
  45         },{
  46             .name = "port",
  47             .type = QEMU_OPT_STRING,
  48         },{
  49             .name = "to",
  50             .type = QEMU_OPT_NUMBER,
  51         },{
  52             .name = "ipv4",
  53             .type = QEMU_OPT_BOOL,
  54         },{
  55             .name = "ipv6",
  56             .type = QEMU_OPT_BOOL,
  57         },{
  58             .name = "block",
  59             .type = QEMU_OPT_BOOL,
  60         },
  61         { /* end if list */ }
  62     },
  63 };
  64
  65 static int inet_getport(struct addrinfo *e)
  66 {
  67     struct sockaddr_in *i4;
  68     struct sockaddr_in6 *i6;
  69
  70     switch (e->ai_family) {
  71     case PF_INET6:
  72         i6 = (void*)e->ai_addr;
  73         return ntohs(i6->sin6_port);
  74     case PF_INET:
  75         i4 = (void*)e->ai_addr;
  76         return ntohs(i4->sin_port);
  77     default:
  78         return 0;
  79     }
  80 }
  81
  82 static void inet_setport(struct addrinfo *e, int port)
  83 {
  84     struct sockaddr_in *i4;
  85     struct sockaddr_in6 *i6;
  86
  87     switch (e->ai_family) {
  88     case PF_INET6:
  89         i6 = (void*)e->ai_addr;
  90         i6->sin6_port = htons(port);
  91         break;
  92     case PF_INET:
  93         i4 = (void*)e->ai_addr;
  94         i4->sin_port = htons(port);
  95         break;
  96     }
  97 }
  98
  99 const char *inet_strfamily(int family)
 100 {
 101     switch (family) {
 102     case PF_INET6: return "ipv6";
 103     case PF_INET:  return "ipv4";
 104     case PF_UNIX:  return "unix";
 105     }
 106     return "unknown";
 107 }
 108
 109 int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp)
 110 {
 111     struct addrinfo ai,*res,*e;
 112     const char *addr;
 113     char port[33];
 114     char uaddr[INET6_ADDRSTRLEN+1];
 115     char uport[33];
 116     int slisten, rc, to, port_min, port_max, p;
 117
 118     memset(&ai,0, sizeof(ai));
 119     ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
 120     ai.ai_family = PF_UNSPEC;
 121     ai.ai_socktype = SOCK_STREAM;
 122
 123     if ((qemu_opt_get(opts, "host") == NULL) ||
 124         (qemu_opt_get(opts, "port") == NULL)) {
 125         fprintf(stderr, "%s: host and/or port not specified\n", __FUNCTION__);
 126         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 127         return -1;
 128     }
 129     pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
 130     addr = qemu_opt_get(opts, "host");
 131
 132     to = qemu_opt_get_number(opts, "to", 0);
 133     if (qemu_opt_get_bool(opts, "ipv4", 0))
 134         ai.ai_family = PF_INET;
 135     if (qemu_opt_get_bool(opts, "ipv6", 0))
 136         ai.ai_family = PF_INET6;
 137
 138     /* lookup */
 139     if (port_offset)
 140         snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
 141     rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
 142     if (rc != 0) {
 143         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 144                 gai_strerror(rc));
 145         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 146         return -1;
 147     }
 148
 149     /* create socket + bind */
 150     for (e = res; e != NULL; e = e->ai_next) {
 151         getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 152                         uaddr,INET6_ADDRSTRLEN,uport,32,
 153                         NI_NUMERICHOST | NI_NUMERICSERV);
 154         slisten = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 155         if (slisten < 0) {
 156             fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
 157                     inet_strfamily(e->ai_family), strerror(errno));
 158             if (!e->ai_next) {
 159                 error_set(errp, QERR_SOCKET_CREATE_FAILED);
 160             }
 161             continue;
 162         }
 163
 164         setsockopt(slisten,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
 165 #ifdef IPV6_V6ONLY
 166         if (e->ai_family == PF_INET6) {
 167             /* listen on both ipv4 and ipv6 */
 168             setsockopt(slisten,IPPROTO_IPV6,IPV6_V6ONLY,(void*)&off,
 169                 sizeof(off));
 170         }
 171 #endif
 172
 173         port_min = inet_getport(e);
 174         port_max = to ? to + port_offset : port_min;
 175         for (p = port_min; p <= port_max; p++) {
 176             inet_setport(e, p);
 177             if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
 178                 goto listen;
 179             }
 180             if (p == port_max) {
 181                 fprintf(stderr,"%s: bind(%s,%s,%d): %s\n", __FUNCTION__,
 182                         inet_strfamily(e->ai_family), uaddr, inet_getport(e),
 183                         strerror(errno));
 184                 if (!e->ai_next) {
 185                     error_set(errp, QERR_SOCKET_BIND_FAILED);
 186                 }
 187             }
 188         }
 189         closesocket(slisten);
 190     }
 191     fprintf(stderr, "%s: FAILED\n", __FUNCTION__);
 192     freeaddrinfo(res);
 193     return -1;
 194
 195 listen:
 196     if (listen(slisten,1) != 0) {
 197         error_set(errp, QERR_SOCKET_LISTEN_FAILED);
 198         perror("listen");
 199         closesocket(slisten);
 200         freeaddrinfo(res);
 201         return -1;
 202     }
 203     snprintf(uport, sizeof(uport), "%d", inet_getport(e) - port_offset);
 204     qemu_opt_set(opts, "host", uaddr);
 205     qemu_opt_set(opts, "port", uport);
 206     qemu_opt_set(opts, "ipv6", (e->ai_family == PF_INET6) ? "on" : "off");
 207     qemu_opt_set(opts, "ipv4", (e->ai_family != PF_INET6) ? "on" : "off");
 208     freeaddrinfo(res);
 209     return slisten;
 210 }
 211
 212 int inet_connect_opts(QemuOpts *opts, bool *in_progress, Error **errp)
 213 {
 214     struct addrinfo ai,*res,*e;
 215     const char *addr;
 216     const char *port;
 217     char uaddr[INET6_ADDRSTRLEN+1];
 218     char uport[33];
 219     int sock,rc;
 220     bool block;
 221
 222     memset(&ai,0, sizeof(ai));
 223     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 224     ai.ai_family = PF_UNSPEC;
 225     ai.ai_socktype = SOCK_STREAM;
 226
 227     if (in_progress) {
 228         *in_progress = false;
 229     }
 230
 231     addr = qemu_opt_get(opts, "host");
 232     port = qemu_opt_get(opts, "port");
 233     block = qemu_opt_get_bool(opts, "block", 0);
 234     if (addr == NULL || port == NULL) {
 235         fprintf(stderr, "inet_connect: host and/or port not specified\n");
 236         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 237         return -1;
 238     }
 239
 240     if (qemu_opt_get_bool(opts, "ipv4", 0))
 241         ai.ai_family = PF_INET;
 242     if (qemu_opt_get_bool(opts, "ipv6", 0))
 243         ai.ai_family = PF_INET6;
 244
 245     /* lookup */
 246     if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) {
 247         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 248                 gai_strerror(rc));
 249         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 250         return -1;
 251     }
 252
 253     for (e = res; e != NULL; e = e->ai_next) {
 254         if (getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 255                             uaddr,INET6_ADDRSTRLEN,uport,32,
 256                             NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 257             fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
 258             continue;
 259         }
 260         sock = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 261         if (sock < 0) {
 262             fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
 263             inet_strfamily(e->ai_family), strerror(errno));
 264             continue;
 265         }
 266         setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
 267         if (!block) {
 268             socket_set_nonblock(sock);
 269         }
 270         /* connect to peer */
 271         do {
 272             rc = 0;
 273             if (connect(sock, e->ai_addr, e->ai_addrlen) < 0) {
 274                 rc = -socket_error();
 275             }
 276         } while (rc == -EINTR);
 277
 278   #ifdef _WIN32
 279         if (!block && (rc == -EINPROGRESS || rc == -EWOULDBLOCK
 280                        || rc == -WSAEALREADY)) {
 281   #else
 282         if (!block && (rc == -EINPROGRESS)) {
 283   #endif
 284             if (in_progress) {
 285                 *in_progress = true;
 286             }
 287
 288             error_set(errp, QERR_SOCKET_CONNECT_IN_PROGRESS);
 289         } else if (rc < 0) {
 290             if (NULL == e->ai_next)
 291                 fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
 292                         inet_strfamily(e->ai_family),
 293                         e->ai_canonname, uaddr, uport, strerror(errno));
 294             closesocket(sock);
 295             continue;
 296         }
 297         freeaddrinfo(res);
 298         return sock;
 299     }
 300     error_set(errp, QERR_SOCKET_CONNECT_FAILED);
 301     freeaddrinfo(res);
 302     return -1;
 303 }
 304
 305 int inet_dgram_opts(QemuOpts *opts)
 306 {
 307     struct addrinfo ai, *peer = NULL, *local = NULL;
 308     const char *addr;
 309     const char *port;
 310     char uaddr[INET6_ADDRSTRLEN+1];
 311     char uport[33];
 312     int sock = -1, rc;
 313
 314     /* lookup peer addr */
 315     memset(&ai,0, sizeof(ai));
 316     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 317     ai.ai_family = PF_UNSPEC;
 318     ai.ai_socktype = SOCK_DGRAM;
 319
 320     addr = qemu_opt_get(opts, "host");
 321     port = qemu_opt_get(opts, "port");
 322     if (addr == NULL || strlen(addr) == 0) {
 323         addr = "localhost";
 324     }
 325     if (port == NULL || strlen(port) == 0) {
 326         fprintf(stderr, "inet_dgram: port not specified\n");
 327         return -1;
 328     }
 329
 330     if (qemu_opt_get_bool(opts, "ipv4", 0))
 331         ai.ai_family = PF_INET;
 332     if (qemu_opt_get_bool(opts, "ipv6", 0))
 333         ai.ai_family = PF_INET6;
 334
 335     if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
 336         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 337                 gai_strerror(rc));
 338         return -1;
 339     }
 340
 341     /* lookup local addr */
 342     memset(&ai,0, sizeof(ai));
 343     ai.ai_flags = AI_PASSIVE;
 344     ai.ai_family = peer->ai_family;
 345     ai.ai_socktype = SOCK_DGRAM;
 346
 347     addr = qemu_opt_get(opts, "localaddr");
 348     port = qemu_opt_get(opts, "localport");
 349     if (addr == NULL || strlen(addr) == 0) {
 350         addr = NULL;
 351     }
 352     if (!port || strlen(port) == 0)
 353         port = "0";
 354
 355     if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
 356         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 357                 gai_strerror(rc));
 358         return -1;
 359     }
 360
 361     /* create socket */
 362     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 363     if (sock < 0) {
 364         fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
 365                 inet_strfamily(peer->ai_family), strerror(errno));
 366         goto err;
 367     }
 368     setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
 369
 370     /* bind socket */
 371     if (getnameinfo((struct sockaddr*)local->ai_addr,local->ai_addrlen,
 372                     uaddr,INET6_ADDRSTRLEN,uport,32,
 373                     NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 374         fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
 375         goto err;
 376     }
 377     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 378         fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__,
 379                 inet_strfamily(local->ai_family), uaddr, inet_getport(local));
 380         goto err;
 381     }
 382
 383     /* connect to peer */
 384     if (getnameinfo((struct sockaddr*)peer->ai_addr, peer->ai_addrlen,
 385                     uaddr, INET6_ADDRSTRLEN, uport, 32,
 386                     NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 387         fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
 388         goto err;
 389     }
 390     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 391         fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
 392                 inet_strfamily(peer->ai_family),
 393                 peer->ai_canonname, uaddr, uport, strerror(errno));
 394         goto err;
 395     }
 396
 397     freeaddrinfo(local);
 398     freeaddrinfo(peer);
 399     return sock;
 400
 401 err:
 402     if (-1 != sock)
 403         closesocket(sock);
 404     if (local)
 405         freeaddrinfo(local);
 406     if (peer)
 407         freeaddrinfo(peer);
 408     return -1;
 409 }
 410
 411 /* compatibility wrapper */
 412 static int inet_parse(QemuOpts *opts, const char *str)
 413 {
 414     const char *optstr, *h;
 415     char addr[64];
 416     char port[33];
 417     int pos;
 418
 419     /* parse address */
 420     if (str[0] == ':') {
 421         /* no host given */
 422         addr[0] = '\0';
 423         if (1 != sscanf(str,":%32[^,]%n",port,&pos)) {
 424             fprintf(stderr, "%s: portonly parse error (%s)\n",
 425                     __FUNCTION__, str);
 426             return -1;
 427         }
 428     } else if (str[0] == '[') {
 429         /* IPv6 addr */
 430         if (2 != sscanf(str,"[%64[^]]]:%32[^,]%n",addr,port,&pos)) {
 431             fprintf(stderr, "%s: ipv6 parse error (%s)\n",
 432                     __FUNCTION__, str);
 433             return -1;
 434         }
 435         qemu_opt_set(opts, "ipv6", "on");
 436     } else if (qemu_isdigit(str[0])) {
 437         /* IPv4 addr */
 438         if (2 != sscanf(str,"%64[0-9.]:%32[^,]%n",addr,port,&pos)) {
 439             fprintf(stderr, "%s: ipv4 parse error (%s)\n",
 440                     __FUNCTION__, str);
 441             return -1;
 442         }
 443         qemu_opt_set(opts, "ipv4", "on");
 444     } else {
 445         /* hostname */
 446         if (2 != sscanf(str,"%64[^:]:%32[^,]%n",addr,port,&pos)) {
 447             fprintf(stderr, "%s: hostname parse error (%s)\n",
 448                     __FUNCTION__, str);
 449             return -1;
 450         }
 451     }
 452     qemu_opt_set(opts, "host", addr);
 453     qemu_opt_set(opts, "port", port);
 454
 455     /* parse options */
 456     optstr = str + pos;
 457     h = strstr(optstr, ",to=");
 458     if (h)
 459         qemu_opt_set(opts, "to", h+4);
 460     if (strstr(optstr, ",ipv4"))
 461         qemu_opt_set(opts, "ipv4", "on");
 462     if (strstr(optstr, ",ipv6"))
 463         qemu_opt_set(opts, "ipv6", "on");
 464     return 0;
 465 }
 466
 467 int inet_listen(const char *str, char *ostr, int olen,
 468                 int socktype, int port_offset, Error **errp)
 469 {
 470     QemuOpts *opts;
 471     char *optstr;
 472     int sock = -1;
 473
 474     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 475     if (inet_parse(opts, str) == 0) {
 476         sock = inet_listen_opts(opts, port_offset, errp);
 477         if (sock != -1 && ostr) {
 478             optstr = strchr(str, ',');
 479             if (qemu_opt_get_bool(opts, "ipv6", 0)) {
 480                 snprintf(ostr, olen, "[%s]:%s%s",
 481                          qemu_opt_get(opts, "host"),
 482                          qemu_opt_get(opts, "port"),
 483                          optstr ? optstr : "");
 484             } else {
 485                 snprintf(ostr, olen, "%s:%s%s",
 486                          qemu_opt_get(opts, "host"),
 487                          qemu_opt_get(opts, "port"),
 488                          optstr ? optstr : "");
 489             }
 490         }
 491     } else {
 492         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 493     }
 494     qemu_opts_del(opts);
 495     return sock;
 496 }
 497
 498 int inet_connect(const char *str, bool block, bool *in_progress, Error **errp)
 499 {
 500     QemuOpts *opts;
 501     int sock = -1;
 502
 503     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 504     if (inet_parse(opts, str) == 0) {
 505         if (block) {
 506             qemu_opt_set(opts, "block", "on");
 507         }
 508         sock = inet_connect_opts(opts, in_progress, errp);
 509     } else {
 510         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 511     }
 512     qemu_opts_del(opts);
 513     return sock;
 514 }
 515
 516 #ifndef _WIN32
 517
 518 int unix_listen_opts(QemuOpts *opts)
 519 {
 520     struct sockaddr_un un;
 521     const char *path = qemu_opt_get(opts, "path");
 522     int sock, fd;
 523
 524     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 525     if (sock < 0) {
 526         perror("socket(unix)");
 527         return -1;
 528     }
 529
 530     memset(&un, 0, sizeof(un));
 531     un.sun_family = AF_UNIX;
 532     if (path && strlen(path)) {
 533         snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 534     } else {
 535         char *tmpdir = getenv("TMPDIR");
 536         snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
 537                  tmpdir ? tmpdir : "/tmp");
 538         /*
 539          * This dummy fd usage silences the mktemp() unsecure warning.
 540          * Using mkstemp() doesn't make things more secure here
 541          * though.  bind() complains about existing files, so we have
 542          * to unlink first and thus re-open the race window.  The
 543          * worst case possible is bind() failing, i.e. a DoS attack.
 544          */
 545         fd = mkstemp(un.sun_path); close(fd);
 546         qemu_opt_set(opts, "path", un.sun_path);
 547     }
 548
 549     unlink(un.sun_path);
 550     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 551         fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
 552         goto err;
 553     }
 554     if (listen(sock, 1) < 0) {
 555         fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
 556         goto err;
 557     }
 558
 559     return sock;
 560
 561 err:
 562     closesocket(sock);
 563     return -1;
 564 }
 565
 566 int unix_connect_opts(QemuOpts *opts)
 567 {
 568     struct sockaddr_un un;
 569     const char *path = qemu_opt_get(opts, "path");
 570     int sock;
 571
 572     if (NULL == path) {
 573         fprintf(stderr, "unix connect: no path specified\n");
 574         return -1;
 575     }
 576
 577     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 578     if (sock < 0) {
 579         perror("socket(unix)");
 580         return -1;
 581     }
 582
 583     memset(&un, 0, sizeof(un));
 584     un.sun_family = AF_UNIX;
 585     snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 586     if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 587         fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
 588         close(sock);
 589         return -1;
 590     }
 591
 592     return sock;
 593 }
 594
 595 /* compatibility wrapper */
 596 int unix_listen(const char *str, char *ostr, int olen)
 597 {
 598     QemuOpts *opts;
 599     char *path, *optstr;
 600     int sock, len;
 601
 602     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 603
 604     optstr = strchr(str, ',');
 605     if (optstr) {
 606         len = optstr - str;
 607         if (len) {
 608             path = g_malloc(len+1);
 609             snprintf(path, len+1, "%.*s", len, str);
 610             qemu_opt_set(opts, "path", path);
 611             g_free(path);
 612         }
 613     } else {
 614         qemu_opt_set(opts, "path", str);
 615     }
 616
 617     sock = unix_listen_opts(opts);
 618
 619     if (sock != -1 && ostr)
 620         snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
 621     qemu_opts_del(opts);
 622     return sock;
 623 }
 624
 625 int unix_connect(const char *path)
 626 {
 627     QemuOpts *opts;
 628     int sock;
 629
 630     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 631     qemu_opt_set(opts, "path", path);
 632     sock = unix_connect_opts(opts);
 633     qemu_opts_del(opts);
 634     return sock;
 635 }
 636
 637 #else
 638
 639 int unix_listen_opts(QemuOpts *opts)
 640 {
 641     fprintf(stderr, "unix sockets are not available on windows\n");
 642     errno = ENOTSUP;
 643     return -1;
 644 }
 645
 646 int unix_connect_opts(QemuOpts *opts)
 647 {
 648     fprintf(stderr, "unix sockets are not available on windows\n");
 649     errno = ENOTSUP;
 650     return -1;
 651 }
 652
 653 int unix_listen(const char *path, char *ostr, int olen)
 654 {
 655     fprintf(stderr, "unix sockets are not available on windows\n");
 656     errno = ENOTSUP;
 657     return -1;
 658 }
 659
 660 int unix_connect(const char *path)
 661 {
 662     fprintf(stderr, "unix sockets are not available on windows\n");
 663     errno = ENOTSUP;
 664     return -1;
 665 }
 666
 667 #endif
 668
 669 #ifdef _WIN32
 670 static void socket_cleanup(void)
 671 {
 672     WSACleanup();
 673 }
 674 #endif
 675
 676 int socket_init(void)
 677 {
 678 #ifdef _WIN32
 679     WSADATA Data;
 680     int ret, err;
 681
 682     ret = WSAStartup(MAKEWORD(2,2), &Data);
 683     if (ret != 0) {
 684         err = WSAGetLastError();
 685         fprintf(stderr, "WSAStartup: %d\n", err);
 686         return -1;
 687     }
 688     atexit(socket_cleanup);
 689 #endif
 690     return 0;
 691 }