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, 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     addr = qemu_opt_get(opts, "host");
 228     port = qemu_opt_get(opts, "port");
 229     block = qemu_opt_get_bool(opts, "block", 0);
 230     if (addr == NULL || port == NULL) {
 231         fprintf(stderr, "inet_connect: host and/or port not specified\n");
 232         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 233         return -1;
 234     }
 235
 236     if (qemu_opt_get_bool(opts, "ipv4", 0))
 237         ai.ai_family = PF_INET;
 238     if (qemu_opt_get_bool(opts, "ipv6", 0))
 239         ai.ai_family = PF_INET6;
 240
 241     /* lookup */
 242     if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) {
 243         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 244                 gai_strerror(rc));
 245         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 246         return -1;
 247     }
 248
 249     for (e = res; e != NULL; e = e->ai_next) {
 250         if (getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
 251                             uaddr,INET6_ADDRSTRLEN,uport,32,
 252                             NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 253             fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
 254             continue;
 255         }
 256         sock = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
 257         if (sock < 0) {
 258             fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
 259             inet_strfamily(e->ai_family), strerror(errno));
 260             continue;
 261         }
 262         setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
 263         if (!block) {
 264             socket_set_nonblock(sock);
 265         }
 266         /* connect to peer */
 267         do {
 268             rc = 0;
 269             if (connect(sock, e->ai_addr, e->ai_addrlen) < 0) {
 270                 rc = -socket_error();
 271             }
 272         } while (rc == -EINTR);
 273
 274   #ifdef _WIN32
 275         if (!block && (rc == -EINPROGRESS || rc == -EWOULDBLOCK
 276                        || rc == -WSAEALREADY)) {
 277   #else
 278         if (!block && (rc == -EINPROGRESS)) {
 279   #endif
 280             error_set(errp, QERR_SOCKET_CONNECT_IN_PROGRESS);
 281         } else if (rc < 0) {
 282             if (NULL == e->ai_next)
 283                 fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
 284                         inet_strfamily(e->ai_family),
 285                         e->ai_canonname, uaddr, uport, strerror(errno));
 286             closesocket(sock);
 287             continue;
 288         }
 289         freeaddrinfo(res);
 290         return sock;
 291     }
 292     error_set(errp, QERR_SOCKET_CONNECT_FAILED);
 293     freeaddrinfo(res);
 294     return -1;
 295 }
 296
 297 int inet_dgram_opts(QemuOpts *opts)
 298 {
 299     struct addrinfo ai, *peer = NULL, *local = NULL;
 300     const char *addr;
 301     const char *port;
 302     char uaddr[INET6_ADDRSTRLEN+1];
 303     char uport[33];
 304     int sock = -1, rc;
 305
 306     /* lookup peer addr */
 307     memset(&ai,0, sizeof(ai));
 308     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
 309     ai.ai_family = PF_UNSPEC;
 310     ai.ai_socktype = SOCK_DGRAM;
 311
 312     addr = qemu_opt_get(opts, "host");
 313     port = qemu_opt_get(opts, "port");
 314     if (addr == NULL || strlen(addr) == 0) {
 315         addr = "localhost";
 316     }
 317     if (port == NULL || strlen(port) == 0) {
 318         fprintf(stderr, "inet_dgram: port not specified\n");
 319         return -1;
 320     }
 321
 322     if (qemu_opt_get_bool(opts, "ipv4", 0))
 323         ai.ai_family = PF_INET;
 324     if (qemu_opt_get_bool(opts, "ipv6", 0))
 325         ai.ai_family = PF_INET6;
 326
 327     if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) {
 328         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 329                 gai_strerror(rc));
 330         return -1;
 331     }
 332
 333     /* lookup local addr */
 334     memset(&ai,0, sizeof(ai));
 335     ai.ai_flags = AI_PASSIVE;
 336     ai.ai_family = peer->ai_family;
 337     ai.ai_socktype = SOCK_DGRAM;
 338
 339     addr = qemu_opt_get(opts, "localaddr");
 340     port = qemu_opt_get(opts, "localport");
 341     if (addr == NULL || strlen(addr) == 0) {
 342         addr = NULL;
 343     }
 344     if (!port || strlen(port) == 0)
 345         port = "0";
 346
 347     if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) {
 348         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
 349                 gai_strerror(rc));
 350         return -1;
 351     }
 352
 353     /* create socket */
 354     sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol);
 355     if (sock < 0) {
 356         fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
 357                 inet_strfamily(peer->ai_family), strerror(errno));
 358         goto err;
 359     }
 360     setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
 361
 362     /* bind socket */
 363     if (getnameinfo((struct sockaddr*)local->ai_addr,local->ai_addrlen,
 364                     uaddr,INET6_ADDRSTRLEN,uport,32,
 365                     NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 366         fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
 367         goto err;
 368     }
 369     if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) {
 370         fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__,
 371                 inet_strfamily(local->ai_family), uaddr, inet_getport(local));
 372         goto err;
 373     }
 374
 375     /* connect to peer */
 376     if (getnameinfo((struct sockaddr*)peer->ai_addr, peer->ai_addrlen,
 377                     uaddr, INET6_ADDRSTRLEN, uport, 32,
 378                     NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 379         fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__);
 380         goto err;
 381     }
 382     if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) {
 383         fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
 384                 inet_strfamily(peer->ai_family),
 385                 peer->ai_canonname, uaddr, uport, strerror(errno));
 386         goto err;
 387     }
 388
 389     freeaddrinfo(local);
 390     freeaddrinfo(peer);
 391     return sock;
 392
 393 err:
 394     if (-1 != sock)
 395         closesocket(sock);
 396     if (local)
 397         freeaddrinfo(local);
 398     if (peer)
 399         freeaddrinfo(peer);
 400     return -1;
 401 }
 402
 403 /* compatibility wrapper */
 404 static int inet_parse(QemuOpts *opts, const char *str)
 405 {
 406     const char *optstr, *h;
 407     char addr[64];
 408     char port[33];
 409     int pos;
 410
 411     /* parse address */
 412     if (str[0] == ':') {
 413         /* no host given */
 414         addr[0] = '\0';
 415         if (1 != sscanf(str,":%32[^,]%n",port,&pos)) {
 416             fprintf(stderr, "%s: portonly parse error (%s)\n",
 417                     __FUNCTION__, str);
 418             return -1;
 419         }
 420     } else if (str[0] == '[') {
 421         /* IPv6 addr */
 422         if (2 != sscanf(str,"[%64[^]]]:%32[^,]%n",addr,port,&pos)) {
 423             fprintf(stderr, "%s: ipv6 parse error (%s)\n",
 424                     __FUNCTION__, str);
 425             return -1;
 426         }
 427         qemu_opt_set(opts, "ipv6", "on");
 428     } else if (qemu_isdigit(str[0])) {
 429         /* IPv4 addr */
 430         if (2 != sscanf(str,"%64[0-9.]:%32[^,]%n",addr,port,&pos)) {
 431             fprintf(stderr, "%s: ipv4 parse error (%s)\n",
 432                     __FUNCTION__, str);
 433             return -1;
 434         }
 435         qemu_opt_set(opts, "ipv4", "on");
 436     } else {
 437         /* hostname */
 438         if (2 != sscanf(str,"%64[^:]:%32[^,]%n",addr,port,&pos)) {
 439             fprintf(stderr, "%s: hostname parse error (%s)\n",
 440                     __FUNCTION__, str);
 441             return -1;
 442         }
 443     }
 444     qemu_opt_set(opts, "host", addr);
 445     qemu_opt_set(opts, "port", port);
 446
 447     /* parse options */
 448     optstr = str + pos;
 449     h = strstr(optstr, ",to=");
 450     if (h)
 451         qemu_opt_set(opts, "to", h+4);
 452     if (strstr(optstr, ",ipv4"))
 453         qemu_opt_set(opts, "ipv4", "on");
 454     if (strstr(optstr, ",ipv6"))
 455         qemu_opt_set(opts, "ipv6", "on");
 456     return 0;
 457 }
 458
 459 int inet_listen(const char *str, char *ostr, int olen,
 460                 int socktype, int port_offset, Error **errp)
 461 {
 462     QemuOpts *opts;
 463     char *optstr;
 464     int sock = -1;
 465
 466     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 467     if (inet_parse(opts, str) == 0) {
 468         sock = inet_listen_opts(opts, port_offset, errp);
 469         if (sock != -1 && ostr) {
 470             optstr = strchr(str, ',');
 471             if (qemu_opt_get_bool(opts, "ipv6", 0)) {
 472                 snprintf(ostr, olen, "[%s]:%s%s",
 473                          qemu_opt_get(opts, "host"),
 474                          qemu_opt_get(opts, "port"),
 475                          optstr ? optstr : "");
 476             } else {
 477                 snprintf(ostr, olen, "%s:%s%s",
 478                          qemu_opt_get(opts, "host"),
 479                          qemu_opt_get(opts, "port"),
 480                          optstr ? optstr : "");
 481             }
 482         }
 483     } else {
 484         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 485     }
 486     qemu_opts_del(opts);
 487     return sock;
 488 }
 489
 490 int inet_connect(const char *str, bool block, Error **errp)
 491 {
 492     QemuOpts *opts;
 493     int sock = -1;
 494
 495     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 496     if (inet_parse(opts, str) == 0) {
 497         if (block) {
 498             qemu_opt_set(opts, "block", "on");
 499         }
 500         sock = inet_connect_opts(opts, errp);
 501     } else {
 502         error_set(errp, QERR_SOCKET_CREATE_FAILED);
 503     }
 504     qemu_opts_del(opts);
 505     return sock;
 506 }
 507
 508 #ifndef _WIN32
 509
 510 int unix_listen_opts(QemuOpts *opts)
 511 {
 512     struct sockaddr_un un;
 513     const char *path = qemu_opt_get(opts, "path");
 514     int sock, fd;
 515
 516     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 517     if (sock < 0) {
 518         perror("socket(unix)");
 519         return -1;
 520     }
 521
 522     memset(&un, 0, sizeof(un));
 523     un.sun_family = AF_UNIX;
 524     if (path && strlen(path)) {
 525         snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 526     } else {
 527         char *tmpdir = getenv("TMPDIR");
 528         snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
 529                  tmpdir ? tmpdir : "/tmp");
 530         /*
 531          * This dummy fd usage silences the mktemp() unsecure warning.
 532          * Using mkstemp() doesn't make things more secure here
 533          * though.  bind() complains about existing files, so we have
 534          * to unlink first and thus re-open the race window.  The
 535          * worst case possible is bind() failing, i.e. a DoS attack.
 536          */
 537         fd = mkstemp(un.sun_path); close(fd);
 538         qemu_opt_set(opts, "path", un.sun_path);
 539     }
 540
 541     unlink(un.sun_path);
 542     if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 543         fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
 544         goto err;
 545     }
 546     if (listen(sock, 1) < 0) {
 547         fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
 548         goto err;
 549     }
 550
 551     return sock;
 552
 553 err:
 554     closesocket(sock);
 555     return -1;
 556 }
 557
 558 int unix_connect_opts(QemuOpts *opts)
 559 {
 560     struct sockaddr_un un;
 561     const char *path = qemu_opt_get(opts, "path");
 562     int sock;
 563
 564     if (NULL == path) {
 565         fprintf(stderr, "unix connect: no path specified\n");
 566         return -1;
 567     }
 568
 569     sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0);
 570     if (sock < 0) {
 571         perror("socket(unix)");
 572         return -1;
 573     }
 574
 575     memset(&un, 0, sizeof(un));
 576     un.sun_family = AF_UNIX;
 577     snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
 578     if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
 579         fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
 580         close(sock);
 581         return -1;
 582     }
 583
 584     return sock;
 585 }
 586
 587 /* compatibility wrapper */
 588 int unix_listen(const char *str, char *ostr, int olen)
 589 {
 590     QemuOpts *opts;
 591     char *path, *optstr;
 592     int sock, len;
 593
 594     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 595
 596     optstr = strchr(str, ',');
 597     if (optstr) {
 598         len = optstr - str;
 599         if (len) {
 600             path = g_malloc(len+1);
 601             snprintf(path, len+1, "%.*s", len, str);
 602             qemu_opt_set(opts, "path", path);
 603             g_free(path);
 604         }
 605     } else {
 606         qemu_opt_set(opts, "path", str);
 607     }
 608
 609     sock = unix_listen_opts(opts);
 610
 611     if (sock != -1 && ostr)
 612         snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : "");
 613     qemu_opts_del(opts);
 614     return sock;
 615 }
 616
 617 int unix_connect(const char *path)
 618 {
 619     QemuOpts *opts;
 620     int sock;
 621
 622     opts = qemu_opts_create(&dummy_opts, NULL, 0, NULL);
 623     qemu_opt_set(opts, "path", path);
 624     sock = unix_connect_opts(opts);
 625     qemu_opts_del(opts);
 626     return sock;
 627 }
 628
 629 #else
 630
 631 int unix_listen_opts(QemuOpts *opts)
 632 {
 633     fprintf(stderr, "unix sockets are not available on windows\n");
 634     errno = ENOTSUP;
 635     return -1;
 636 }
 637
 638 int unix_connect_opts(QemuOpts *opts)
 639 {
 640     fprintf(stderr, "unix sockets are not available on windows\n");
 641     errno = ENOTSUP;
 642     return -1;
 643 }
 644
 645 int unix_listen(const char *path, char *ostr, int olen)
 646 {
 647     fprintf(stderr, "unix sockets are not available on windows\n");
 648     errno = ENOTSUP;
 649     return -1;
 650 }
 651
 652 int unix_connect(const char *path)
 653 {
 654     fprintf(stderr, "unix sockets are not available on windows\n");
 655     errno = ENOTSUP;
 656     return -1;
 657 }
 658
 659 #endif
 660
 661 #ifdef _WIN32
 662 static void socket_cleanup(void)
 663 {
 664     WSACleanup();
 665 }
 666 #endif
 667
 668 int socket_init(void)
 669 {
 670 #ifdef _WIN32
 671     WSADATA Data;
 672     int ret, err;
 673
 674     ret = WSAStartup(MAKEWORD(2,2), &Data);
 675     if (ret != 0) {
 676         err = WSAGetLastError();
 677         fprintf(stderr, "WSAStartup: %d\n", err);
 678         return -1;
 679     }
 680     atexit(socket_cleanup);
 681 #endif
 682     return 0;
 683 }