net/socket.c

   1 /*
   2  * QEMU System Emulator
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "config-host.h"
  25
  26 #include "net/net.h"
  27 #include "clients.h"
  28 #include "monitor/monitor.h"
  29 #include "qemu-common.h"
  30 #include "qemu/error-report.h"
  31 #include "qemu/option.h"
  32 #include "qemu/sockets.h"
  33 #include "qemu/iov.h"
  34
  35 typedef struct NetSocketState {
  36     NetClientState nc;
  37     int listen_fd;
  38     int fd;
  39     int state; /* 0 = getting length, 1 = getting data */
  40     unsigned int index;
  41     unsigned int packet_len;
  42     unsigned int send_index;      /* number of bytes sent (only SOCK_STREAM) */
  43     uint8_t buf[4096];
  44     struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
  45     IOHandler *send_fn;           /* differs between SOCK_STREAM/SOCK_DGRAM */
  46     bool read_poll;               /* waiting to receive data? */
  47     bool write_poll;              /* waiting to transmit data? */
  48 } NetSocketState;
  49
  50 static void net_socket_accept(void *opaque);
  51 static void net_socket_writable(void *opaque);
  52
  53 /* Only read packets from socket when peer can receive them */
  54 static int net_socket_can_send(void *opaque)
  55 {
  56     NetSocketState *s = opaque;
  57
  58     return qemu_can_send_packet(&s->nc);
  59 }
  60
  61 static void net_socket_update_fd_handler(NetSocketState *s)
  62 {
  63     qemu_set_fd_handler2(s->fd,
  64                          s->read_poll  ? net_socket_can_send : NULL,
  65                          s->read_poll  ? s->send_fn : NULL,
  66                          s->write_poll ? net_socket_writable : NULL,
  67                          s);
  68 }
  69
  70 static void net_socket_read_poll(NetSocketState *s, bool enable)
  71 {
  72     s->read_poll = enable;
  73     net_socket_update_fd_handler(s);
  74 }
  75
  76 static void net_socket_write_poll(NetSocketState *s, bool enable)
  77 {
  78     s->write_poll = enable;
  79     net_socket_update_fd_handler(s);
  80 }
  81
  82 static void net_socket_writable(void *opaque)
  83 {
  84     NetSocketState *s = opaque;
  85
  86     net_socket_write_poll(s, false);
  87
  88     qemu_flush_queued_packets(&s->nc);
  89 }
  90
  91 static ssize_t net_socket_receive(NetClientState *nc, const uint8_t *buf, size_t size)
  92 {
  93     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
  94     uint32_t len = htonl(size);
  95     struct iovec iov[] = {
  96         {
  97             .iov_base = &len,
  98             .iov_len  = sizeof(len),
  99         }, {
 100             .iov_base = (void *)buf,
 101             .iov_len  = size,
 102         },
 103     };
 104     size_t remaining;
 105     ssize_t ret;
 106
 107     remaining = iov_size(iov, 2) - s->send_index;
 108     ret = iov_send(s->fd, iov, 2, s->send_index, remaining);
 109
 110     if (ret == -1 && errno == EAGAIN) {
 111         ret = 0; /* handled further down */
 112     }
 113     if (ret == -1) {
 114         s->send_index = 0;
 115         return -errno;
 116     }
 117     if (ret < (ssize_t)remaining) {
 118         s->send_index += ret;
 119         net_socket_write_poll(s, true);
 120         return 0;
 121     }
 122     s->send_index = 0;
 123     return size;
 124 }
 125
 126 static ssize_t net_socket_receive_dgram(NetClientState *nc, const uint8_t *buf, size_t size)
 127 {
 128     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 129     ssize_t ret;
 130
 131     do {
 132         ret = qemu_sendto(s->fd, buf, size, 0,
 133                           (struct sockaddr *)&s->dgram_dst,
 134                           sizeof(s->dgram_dst));
 135     } while (ret == -1 && errno == EINTR);
 136
 137     if (ret == -1 && errno == EAGAIN) {
 138         net_socket_write_poll(s, true);
 139         return 0;
 140     }
 141     return ret;
 142 }
 143
 144 static void net_socket_send(void *opaque)
 145 {
 146     NetSocketState *s = opaque;
 147     int size, err;
 148     unsigned l;
 149     uint8_t buf1[4096];
 150     const uint8_t *buf;
 151
 152     size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
 153     if (size < 0) {
 154         err = socket_error();
 155         if (err != EWOULDBLOCK)
 156             goto eoc;
 157     } else if (size == 0) {
 158         /* end of connection */
 159     eoc:
 160         net_socket_read_poll(s, false);
 161         net_socket_write_poll(s, false);
 162         if (s->listen_fd != -1) {
 163             qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
 164         }
 165         closesocket(s->fd);
 166
 167         s->fd = -1;
 168         s->state = 0;
 169         s->index = 0;
 170         s->packet_len = 0;
 171         s->nc.link_down = true;
 172         memset(s->buf, 0, sizeof(s->buf));
 173         memset(s->nc.info_str, 0, sizeof(s->nc.info_str));
 174
 175         return;
 176     }
 177     buf = buf1;
 178     while (size > 0) {
 179         /* reassemble a packet from the network */
 180         switch(s->state) {
 181         case 0:
 182             l = 4 - s->index;
 183             if (l > size)
 184                 l = size;
 185             memcpy(s->buf + s->index, buf, l);
 186             buf += l;
 187             size -= l;
 188             s->index += l;
 189             if (s->index == 4) {
 190                 /* got length */
 191                 s->packet_len = ntohl(*(uint32_t *)s->buf);
 192                 s->index = 0;
 193                 s->state = 1;
 194             }
 195             break;
 196         case 1:
 197             l = s->packet_len - s->index;
 198             if (l > size)
 199                 l = size;
 200             if (s->index + l <= sizeof(s->buf)) {
 201                 memcpy(s->buf + s->index, buf, l);
 202             } else {
 203                 fprintf(stderr, "serious error: oversized packet received,"
 204                     "connection terminated.\n");
 205                 s->state = 0;
 206                 goto eoc;
 207             }
 208
 209             s->index += l;
 210             buf += l;
 211             size -= l;
 212             if (s->index >= s->packet_len) {
 213                 qemu_send_packet(&s->nc, s->buf, s->packet_len);
 214                 s->index = 0;
 215                 s->state = 0;
 216             }
 217             break;
 218         }
 219     }
 220 }
 221
 222 static void net_socket_send_dgram(void *opaque)
 223 {
 224     NetSocketState *s = opaque;
 225     int size;
 226
 227     size = qemu_recv(s->fd, s->buf, sizeof(s->buf), 0);
 228     if (size < 0)
 229         return;
 230     if (size == 0) {
 231         /* end of connection */
 232         net_socket_read_poll(s, false);
 233         net_socket_write_poll(s, false);
 234         return;
 235     }
 236     qemu_send_packet(&s->nc, s->buf, size);
 237 }
 238
 239 static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr)
 240 {
 241     struct ip_mreq imr;
 242     int fd;
 243     int val, ret;
 244 #ifdef __OpenBSD__
 245     unsigned char loop;
 246 #else
 247     int loop;
 248 #endif
 249
 250     if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
 251         fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) "
 252                 "does not contain a multicast address\n",
 253                 inet_ntoa(mcastaddr->sin_addr),
 254                 (int)ntohl(mcastaddr->sin_addr.s_addr));
 255         return -1;
 256
 257     }
 258     fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 259     if (fd < 0) {
 260         perror("socket(PF_INET, SOCK_DGRAM)");
 261         return -1;
 262     }
 263
 264     val = 1;
 265     ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
 266                    (const char *)&val, sizeof(val));
 267     if (ret < 0) {
 268         perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
 269         goto fail;
 270     }
 271
 272     ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
 273     if (ret < 0) {
 274         perror("bind");
 275         goto fail;
 276     }
 277
 278     /* Add host to multicast group */
 279     imr.imr_multiaddr = mcastaddr->sin_addr;
 280     if (localaddr) {
 281         imr.imr_interface = *localaddr;
 282     } else {
 283         imr.imr_interface.s_addr = htonl(INADDR_ANY);
 284     }
 285
 286     ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 287                      (const char *)&imr, sizeof(struct ip_mreq));
 288     if (ret < 0) {
 289         perror("setsockopt(IP_ADD_MEMBERSHIP)");
 290         goto fail;
 291     }
 292
 293     /* Force mcast msgs to loopback (eg. several QEMUs in same host */
 294     loop = 1;
 295     ret=setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 296                    (const char *)&loop, sizeof(loop));
 297     if (ret < 0) {
 298         perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
 299         goto fail;
 300     }
 301
 302     /* If a bind address is given, only send packets from that address */
 303     if (localaddr != NULL) {
 304         ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
 305                          (const char *)localaddr, sizeof(*localaddr));
 306         if (ret < 0) {
 307             perror("setsockopt(IP_MULTICAST_IF)");
 308             goto fail;
 309         }
 310     }
 311
 312     socket_set_nonblock(fd);
 313     return fd;
 314 fail:
 315     if (fd >= 0)
 316         closesocket(fd);
 317     return -1;
 318 }
 319
 320 static void net_socket_cleanup(NetClientState *nc)
 321 {
 322     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 323     if (s->fd != -1) {
 324         net_socket_read_poll(s, false);
 325         net_socket_write_poll(s, false);
 326         close(s->fd);
 327         s->fd = -1;
 328     }
 329     if (s->listen_fd != -1) {
 330         qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
 331         closesocket(s->listen_fd);
 332         s->listen_fd = -1;
 333     }
 334 }
 335
 336 static NetClientInfo net_dgram_socket_info = {
 337     .type = NET_CLIENT_OPTIONS_KIND_SOCKET,
 338     .size = sizeof(NetSocketState),
 339     .receive = net_socket_receive_dgram,
 340     .cleanup = net_socket_cleanup,
 341 };
 342
 343 static NetSocketState *net_socket_fd_init_dgram(NetClientState *peer,
 344                                                 const char *model,
 345                                                 const char *name,
 346                                                 int fd, int is_connected)
 347 {
 348     struct sockaddr_in saddr;
 349     int newfd;
 350     socklen_t saddr_len;
 351     NetClientState *nc;
 352     NetSocketState *s;
 353
 354     /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
 355      * Because this may be "shared" socket from a "master" process, datagrams would be recv()
 356      * by ONLY ONE process: we must "clone" this dgram socket --jjo
 357      */
 358
 359     if (is_connected) {
 360         if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
 361             /* must be bound */
 362             if (saddr.sin_addr.s_addr == 0) {
 363                 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, "
 364                         "cannot setup multicast dst addr\n", fd);
 365                 goto err;
 366             }
 367             /* clone dgram socket */
 368             newfd = net_socket_mcast_create(&saddr, NULL);
 369             if (newfd < 0) {
 370                 /* error already reported by net_socket_mcast_create() */
 371                 goto err;
 372             }
 373             /* clone newfd to fd, close newfd */
 374             dup2(newfd, fd);
 375             close(newfd);
 376
 377         } else {
 378             fprintf(stderr,
 379                     "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
 380                     fd, strerror(errno));
 381             goto err;
 382         }
 383     }
 384
 385     nc = qemu_new_net_client(&net_dgram_socket_info, peer, model, name);
 386
 387     snprintf(nc->info_str, sizeof(nc->info_str),
 388             "socket: fd=%d (%s mcast=%s:%d)",
 389             fd, is_connected ? "cloned" : "",
 390             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 391
 392     s = DO_UPCAST(NetSocketState, nc, nc);
 393
 394     s->fd = fd;
 395     s->listen_fd = -1;
 396     s->send_fn = net_socket_send_dgram;
 397     net_socket_read_poll(s, true);
 398
 399     /* mcast: save bound address as dst */
 400     if (is_connected) {
 401         s->dgram_dst = saddr;
 402     }
 403
 404     return s;
 405
 406 err:
 407     closesocket(fd);
 408     return NULL;
 409 }
 410
 411 static void net_socket_connect(void *opaque)
 412 {
 413     NetSocketState *s = opaque;
 414     s->send_fn = net_socket_send;
 415     net_socket_read_poll(s, true);
 416 }
 417
 418 static NetClientInfo net_socket_info = {
 419     .type = NET_CLIENT_OPTIONS_KIND_SOCKET,
 420     .size = sizeof(NetSocketState),
 421     .receive = net_socket_receive,
 422     .cleanup = net_socket_cleanup,
 423 };
 424
 425 static NetSocketState *net_socket_fd_init_stream(NetClientState *peer,
 426                                                  const char *model,
 427                                                  const char *name,
 428                                                  int fd, int is_connected)
 429 {
 430     NetClientState *nc;
 431     NetSocketState *s;
 432
 433     nc = qemu_new_net_client(&net_socket_info, peer, model, name);
 434
 435     snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
 436
 437     s = DO_UPCAST(NetSocketState, nc, nc);
 438
 439     s->fd = fd;
 440     s->listen_fd = -1;
 441
 442     if (is_connected) {
 443         net_socket_connect(s);
 444     } else {
 445         qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
 446     }
 447     return s;
 448 }
 449
 450 static NetSocketState *net_socket_fd_init(NetClientState *peer,
 451                                           const char *model, const char *name,
 452                                           int fd, int is_connected)
 453 {
 454     int so_type = -1, optlen=sizeof(so_type);
 455
 456     if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
 457         (socklen_t *)&optlen)< 0) {
 458         fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n",
 459                 fd);
 460         closesocket(fd);
 461         return NULL;
 462     }
 463     switch(so_type) {
 464     case SOCK_DGRAM:
 465         return net_socket_fd_init_dgram(peer, model, name, fd, is_connected);
 466     case SOCK_STREAM:
 467         return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
 468     default:
 469         /* who knows ... this could be a eg. a pty, do warn and continue as stream */
 470         fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
 471         return net_socket_fd_init_stream(peer, model, name, fd, is_connected);
 472     }
 473     return NULL;
 474 }
 475
 476 static void net_socket_accept(void *opaque)
 477 {
 478     NetSocketState *s = opaque;
 479     struct sockaddr_in saddr;
 480     socklen_t len;
 481     int fd;
 482
 483     for(;;) {
 484         len = sizeof(saddr);
 485         fd = qemu_accept(s->listen_fd, (struct sockaddr *)&saddr, &len);
 486         if (fd < 0 && errno != EINTR) {
 487             return;
 488         } else if (fd >= 0) {
 489             qemu_set_fd_handler(s->listen_fd, NULL, NULL, NULL);
 490             break;
 491         }
 492     }
 493
 494     s->fd = fd;
 495     s->nc.link_down = false;
 496     net_socket_connect(s);
 497     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 498              "socket: connection from %s:%d",
 499              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 500 }
 501
 502 static int net_socket_listen_init(NetClientState *peer,
 503                                   const char *model,
 504                                   const char *name,
 505                                   const char *host_str)
 506 {
 507     NetClientState *nc;
 508     NetSocketState *s;
 509     struct sockaddr_in saddr;
 510     int fd, val, ret;
 511
 512     if (parse_host_port(&saddr, host_str) < 0)
 513         return -1;
 514
 515     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 516     if (fd < 0) {
 517         perror("socket");
 518         return -1;
 519     }
 520     socket_set_nonblock(fd);
 521
 522     /* allow fast reuse */
 523     val = 1;
 524     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
 525
 526     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 527     if (ret < 0) {
 528         perror("bind");
 529         closesocket(fd);
 530         return -1;
 531     }
 532     ret = listen(fd, 0);
 533     if (ret < 0) {
 534         perror("listen");
 535         closesocket(fd);
 536         return -1;
 537     }
 538
 539     nc = qemu_new_net_client(&net_socket_info, peer, model, name);
 540     s = DO_UPCAST(NetSocketState, nc, nc);
 541     s->fd = -1;
 542     s->listen_fd = fd;
 543     s->nc.link_down = true;
 544
 545     qemu_set_fd_handler(s->listen_fd, net_socket_accept, NULL, s);
 546     return 0;
 547 }
 548
 549 static int net_socket_connect_init(NetClientState *peer,
 550                                    const char *model,
 551                                    const char *name,
 552                                    const char *host_str)
 553 {
 554     NetSocketState *s;
 555     int fd, connected, ret, err;
 556     struct sockaddr_in saddr;
 557
 558     if (parse_host_port(&saddr, host_str) < 0)
 559         return -1;
 560
 561     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 562     if (fd < 0) {
 563         perror("socket");
 564         return -1;
 565     }
 566     socket_set_nonblock(fd);
 567
 568     connected = 0;
 569     for(;;) {
 570         ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 571         if (ret < 0) {
 572             err = socket_error();
 573             if (err == EINTR || err == EWOULDBLOCK) {
 574             } else if (err == EINPROGRESS) {
 575                 break;
 576 #ifdef _WIN32
 577             } else if (err == WSAEALREADY || err == WSAEINVAL) {
 578                 break;
 579 #endif
 580             } else {
 581                 perror("connect");
 582                 closesocket(fd);
 583                 return -1;
 584             }
 585         } else {
 586             connected = 1;
 587             break;
 588         }
 589     }
 590     s = net_socket_fd_init(peer, model, name, fd, connected);
 591     if (!s)
 592         return -1;
 593     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 594              "socket: connect to %s:%d",
 595              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 596     return 0;
 597 }
 598
 599 static int net_socket_mcast_init(NetClientState *peer,
 600                                  const char *model,
 601                                  const char *name,
 602                                  const char *host_str,
 603                                  const char *localaddr_str)
 604 {
 605     NetSocketState *s;
 606     int fd;
 607     struct sockaddr_in saddr;
 608     struct in_addr localaddr, *param_localaddr;
 609
 610     if (parse_host_port(&saddr, host_str) < 0)
 611         return -1;
 612
 613     if (localaddr_str != NULL) {
 614         if (inet_aton(localaddr_str, &localaddr) == 0)
 615             return -1;
 616         param_localaddr = &localaddr;
 617     } else {
 618         param_localaddr = NULL;
 619     }
 620
 621     fd = net_socket_mcast_create(&saddr, param_localaddr);
 622     if (fd < 0)
 623         return -1;
 624
 625     s = net_socket_fd_init(peer, model, name, fd, 0);
 626     if (!s)
 627         return -1;
 628
 629     s->dgram_dst = saddr;
 630
 631     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 632              "socket: mcast=%s:%d",
 633              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 634     return 0;
 635
 636 }
 637
 638 static int net_socket_udp_init(NetClientState *peer,
 639                                  const char *model,
 640                                  const char *name,
 641                                  const char *rhost,
 642                                  const char *lhost)
 643 {
 644     NetSocketState *s;
 645     int fd, val, ret;
 646     struct sockaddr_in laddr, raddr;
 647
 648     if (parse_host_port(&laddr, lhost) < 0) {
 649         return -1;
 650     }
 651
 652     if (parse_host_port(&raddr, rhost) < 0) {
 653         return -1;
 654     }
 655
 656     fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 657     if (fd < 0) {
 658         perror("socket(PF_INET, SOCK_DGRAM)");
 659         return -1;
 660     }
 661     val = 1;
 662     ret = setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
 663                    (const char *)&val, sizeof(val));
 664     if (ret < 0) {
 665         perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
 666         closesocket(fd);
 667         return -1;
 668     }
 669     ret = bind(fd, (struct sockaddr *)&laddr, sizeof(laddr));
 670     if (ret < 0) {
 671         perror("bind");
 672         closesocket(fd);
 673         return -1;
 674     }
 675
 676     s = net_socket_fd_init(peer, model, name, fd, 0);
 677     if (!s) {
 678         return -1;
 679     }
 680
 681     s->dgram_dst = raddr;
 682
 683     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 684              "socket: udp=%s:%d",
 685              inet_ntoa(raddr.sin_addr), ntohs(raddr.sin_port));
 686     return 0;
 687 }
 688
 689 int net_init_socket(const NetClientOptions *opts, const char *name,
 690                     NetClientState *peer)
 691 {
 692     const NetdevSocketOptions *sock;
 693
 694     assert(opts->kind == NET_CLIENT_OPTIONS_KIND_SOCKET);
 695     sock = opts->socket;
 696
 697     if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
 698         sock->has_udp != 1) {
 699         error_report("exactly one of fd=, listen=, connect=, mcast= or udp="
 700                      " is required");
 701         return -1;
 702     }
 703
 704     if (sock->has_localaddr && !sock->has_mcast && !sock->has_udp) {
 705         error_report("localaddr= is only valid with mcast= or udp=");
 706         return -1;
 707     }
 708
 709     if (sock->has_fd) {
 710         int fd;
 711
 712         fd = monitor_handle_fd_param(cur_mon, sock->fd);
 713         if (fd == -1 || !net_socket_fd_init(peer, "socket", name, fd, 1)) {
 714             return -1;
 715         }
 716         return 0;
 717     }
 718
 719     if (sock->has_listen) {
 720         if (net_socket_listen_init(peer, "socket", name, sock->listen) == -1) {
 721             return -1;
 722         }
 723         return 0;
 724     }
 725
 726     if (sock->has_connect) {
 727         if (net_socket_connect_init(peer, "socket", name, sock->connect) ==
 728             -1) {
 729             return -1;
 730         }
 731         return 0;
 732     }
 733
 734     if (sock->has_mcast) {
 735         /* if sock->localaddr is missing, it has been initialized to "all bits
 736          * zero" */
 737         if (net_socket_mcast_init(peer, "socket", name, sock->mcast,
 738             sock->localaddr) == -1) {
 739             return -1;
 740         }
 741         return 0;
 742     }
 743
 744     assert(sock->has_udp);
 745     if (!sock->has_localaddr) {
 746         error_report("localaddr= is mandatory with udp=");
 747         return -1;
 748     }
 749     if (net_socket_udp_init(peer, "socket", name, sock->udp, sock->localaddr) ==
 750         -1) {
 751         return -1;
 752     }
 753     return 0;
 754 }