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 "net/socket.h"
  25
  26 #include "config-host.h"
  27
  28 #include "net.h"
  29 #include "qemu-char.h"
  30 #include "qemu-common.h"
  31 #include "qemu-error.h"
  32 #include "qemu-option.h"
  33 #include "qemu_socket.h"
  34
  35 typedef struct NetSocketState {
  36     VLANClientState nc;
  37     int fd;
  38     int state; /* 0 = getting length, 1 = getting data */
  39     unsigned int index;
  40     unsigned int packet_len;
  41     uint8_t buf[4096];
  42     struct sockaddr_in dgram_dst; /* contains inet host and port destination iff connectionless (SOCK_DGRAM) */
  43 } NetSocketState;
  44
  45 typedef struct NetSocketListenState {
  46     VLANState *vlan;
  47     char *model;
  48     char *name;
  49     int fd;
  50 } NetSocketListenState;
  51
  52 /* XXX: we consider we can send the whole packet without blocking */
  53 static ssize_t net_socket_receive(VLANClientState *nc, const uint8_t *buf, size_t size)
  54 {
  55     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
  56     uint32_t len;
  57     len = htonl(size);
  58
  59     send_all(s->fd, (const uint8_t *)&len, sizeof(len));
  60     return send_all(s->fd, buf, size);
  61 }
  62
  63 static ssize_t net_socket_receive_dgram(VLANClientState *nc, const uint8_t *buf, size_t size)
  64 {
  65     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
  66
  67     return sendto(s->fd, (const void *)buf, size, 0,
  68                   (struct sockaddr *)&s->dgram_dst, sizeof(s->dgram_dst));
  69 }
  70
  71 static void net_socket_send(void *opaque)
  72 {
  73     NetSocketState *s = opaque;
  74     int size, err;
  75     unsigned l;
  76     uint8_t buf1[4096];
  77     const uint8_t *buf;
  78
  79     size = qemu_recv(s->fd, buf1, sizeof(buf1), 0);
  80     if (size < 0) {
  81         err = socket_error();
  82         if (err != EWOULDBLOCK)
  83             goto eoc;
  84     } else if (size == 0) {
  85         /* end of connection */
  86     eoc:
  87         qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
  88         closesocket(s->fd);
  89         return;
  90     }
  91     buf = buf1;
  92     while (size > 0) {
  93         /* reassemble a packet from the network */
  94         switch(s->state) {
  95         case 0:
  96             l = 4 - s->index;
  97             if (l > size)
  98                 l = size;
  99             memcpy(s->buf + s->index, buf, l);
 100             buf += l;
 101             size -= l;
 102             s->index += l;
 103             if (s->index == 4) {
 104                 /* got length */
 105                 s->packet_len = ntohl(*(uint32_t *)s->buf);
 106                 s->index = 0;
 107                 s->state = 1;
 108             }
 109             break;
 110         case 1:
 111             l = s->packet_len - s->index;
 112             if (l > size)
 113                 l = size;
 114             if (s->index + l <= sizeof(s->buf)) {
 115                 memcpy(s->buf + s->index, buf, l);
 116             } else {
 117                 fprintf(stderr, "serious error: oversized packet received,"
 118                     "connection terminated.\n");
 119                 s->state = 0;
 120                 goto eoc;
 121             }
 122
 123             s->index += l;
 124             buf += l;
 125             size -= l;
 126             if (s->index >= s->packet_len) {
 127                 qemu_send_packet(&s->nc, s->buf, s->packet_len);
 128                 s->index = 0;
 129                 s->state = 0;
 130             }
 131             break;
 132         }
 133     }
 134 }
 135
 136 static void net_socket_send_dgram(void *opaque)
 137 {
 138     NetSocketState *s = opaque;
 139     int size;
 140
 141     size = qemu_recv(s->fd, s->buf, sizeof(s->buf), 0);
 142     if (size < 0)
 143         return;
 144     if (size == 0) {
 145         /* end of connection */
 146         qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 147         return;
 148     }
 149     qemu_send_packet(&s->nc, s->buf, size);
 150 }
 151
 152 static int net_socket_mcast_create(struct sockaddr_in *mcastaddr, struct in_addr *localaddr)
 153 {
 154     struct ip_mreq imr;
 155     int fd;
 156     int val, ret;
 157 #ifdef __OpenBSD__
 158     unsigned char loop;
 159 #else
 160     int loop;
 161 #endif
 162
 163     if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
 164         fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) does not contain a multicast address\n",
 165                 inet_ntoa(mcastaddr->sin_addr),
 166                 (int)ntohl(mcastaddr->sin_addr.s_addr));
 167         return -1;
 168
 169     }
 170     fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 171     if (fd < 0) {
 172         perror("socket(PF_INET, SOCK_DGRAM)");
 173         return -1;
 174     }
 175
 176     val = 1;
 177     ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
 178                    (const char *)&val, sizeof(val));
 179     if (ret < 0) {
 180         perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
 181         goto fail;
 182     }
 183
 184     ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
 185     if (ret < 0) {
 186         perror("bind");
 187         goto fail;
 188     }
 189
 190     /* Add host to multicast group */
 191     imr.imr_multiaddr = mcastaddr->sin_addr;
 192     if (localaddr) {
 193         imr.imr_interface = *localaddr;
 194     } else {
 195         imr.imr_interface.s_addr = htonl(INADDR_ANY);
 196     }
 197
 198     ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 199                      (const char *)&imr, sizeof(struct ip_mreq));
 200     if (ret < 0) {
 201         perror("setsockopt(IP_ADD_MEMBERSHIP)");
 202         goto fail;
 203     }
 204
 205     /* Force mcast msgs to loopback (eg. several QEMUs in same host */
 206     loop = 1;
 207     ret=setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 208                    (const char *)&loop, sizeof(loop));
 209     if (ret < 0) {
 210         perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
 211         goto fail;
 212     }
 213
 214     /* If a bind address is given, only send packets from that address */
 215     if (localaddr != NULL) {
 216         ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
 217                          (const char *)localaddr, sizeof(*localaddr));
 218         if (ret < 0) {
 219             perror("setsockopt(IP_MULTICAST_IF)");
 220             goto fail;
 221         }
 222     }
 223
 224     socket_set_nonblock(fd);
 225     return fd;
 226 fail:
 227     if (fd >= 0)
 228         closesocket(fd);
 229     return -1;
 230 }
 231
 232 static void net_socket_cleanup(VLANClientState *nc)
 233 {
 234     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 235     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 236     close(s->fd);
 237 }
 238
 239 static NetClientInfo net_dgram_socket_info = {
 240     .type = NET_CLIENT_TYPE_SOCKET,
 241     .size = sizeof(NetSocketState),
 242     .receive = net_socket_receive_dgram,
 243     .cleanup = net_socket_cleanup,
 244 };
 245
 246 static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan,
 247                                                 const char *model,
 248                                                 const char *name,
 249                                                 int fd, int is_connected)
 250 {
 251     struct sockaddr_in saddr;
 252     int newfd;
 253     socklen_t saddr_len;
 254     VLANClientState *nc;
 255     NetSocketState *s;
 256
 257     /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
 258      * Because this may be "shared" socket from a "master" process, datagrams would be recv()
 259      * by ONLY ONE process: we must "clone" this dgram socket --jjo
 260      */
 261
 262     if (is_connected) {
 263         if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
 264             /* must be bound */
 265             if (saddr.sin_addr.s_addr==0) {
 266                 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, cannot setup multicast dst addr\n",
 267                         fd);
 268                 return NULL;
 269             }
 270             /* clone dgram socket */
 271             newfd = net_socket_mcast_create(&saddr, NULL);
 272             if (newfd < 0) {
 273                 /* error already reported by net_socket_mcast_create() */
 274                 close(fd);
 275                 return NULL;
 276             }
 277             /* clone newfd to fd, close newfd */
 278             dup2(newfd, fd);
 279             close(newfd);
 280
 281         } else {
 282             fprintf(stderr, "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
 283                     fd, strerror(errno));
 284             return NULL;
 285         }
 286     }
 287
 288     nc = qemu_new_net_client(&net_dgram_socket_info, vlan, NULL, model, name);
 289
 290     snprintf(nc->info_str, sizeof(nc->info_str),
 291             "socket: fd=%d (%s mcast=%s:%d)",
 292             fd, is_connected ? "cloned" : "",
 293             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 294
 295     s = DO_UPCAST(NetSocketState, nc, nc);
 296
 297     s->fd = fd;
 298
 299     qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
 300
 301     /* mcast: save bound address as dst */
 302     if (is_connected) s->dgram_dst=saddr;
 303
 304     return s;
 305 }
 306
 307 static void net_socket_connect(void *opaque)
 308 {
 309     NetSocketState *s = opaque;
 310     qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
 311 }
 312
 313 static NetClientInfo net_socket_info = {
 314     .type = NET_CLIENT_TYPE_SOCKET,
 315     .size = sizeof(NetSocketState),
 316     .receive = net_socket_receive,
 317     .cleanup = net_socket_cleanup,
 318 };
 319
 320 static NetSocketState *net_socket_fd_init_stream(VLANState *vlan,
 321                                                  const char *model,
 322                                                  const char *name,
 323                                                  int fd, int is_connected)
 324 {
 325     VLANClientState *nc;
 326     NetSocketState *s;
 327
 328     nc = qemu_new_net_client(&net_socket_info, vlan, NULL, model, name);
 329
 330     snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
 331
 332     s = DO_UPCAST(NetSocketState, nc, nc);
 333
 334     s->fd = fd;
 335
 336     if (is_connected) {
 337         net_socket_connect(s);
 338     } else {
 339         qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
 340     }
 341     return s;
 342 }
 343
 344 static NetSocketState *net_socket_fd_init(VLANState *vlan,
 345                                           const char *model, const char *name,
 346                                           int fd, int is_connected)
 347 {
 348     int so_type = -1, optlen=sizeof(so_type);
 349
 350     if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
 351         (socklen_t *)&optlen)< 0) {
 352         fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n", fd);
 353         return NULL;
 354     }
 355     switch(so_type) {
 356     case SOCK_DGRAM:
 357         return net_socket_fd_init_dgram(vlan, model, name, fd, is_connected);
 358     case SOCK_STREAM:
 359         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
 360     default:
 361         /* who knows ... this could be a eg. a pty, do warn and continue as stream */
 362         fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
 363         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
 364     }
 365     return NULL;
 366 }
 367
 368 static void net_socket_accept(void *opaque)
 369 {
 370     NetSocketListenState *s = opaque;
 371     NetSocketState *s1;
 372     struct sockaddr_in saddr;
 373     socklen_t len;
 374     int fd;
 375
 376     for(;;) {
 377         len = sizeof(saddr);
 378         fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
 379         if (fd < 0 && errno != EINTR) {
 380             return;
 381         } else if (fd >= 0) {
 382             break;
 383         }
 384     }
 385     s1 = net_socket_fd_init(s->vlan, s->model, s->name, fd, 1);
 386     if (!s1) {
 387         closesocket(fd);
 388     } else {
 389         snprintf(s1->nc.info_str, sizeof(s1->nc.info_str),
 390                  "socket: connection from %s:%d",
 391                  inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 392     }
 393 }
 394
 395 static int net_socket_listen_init(VLANState *vlan,
 396                                   const char *model,
 397                                   const char *name,
 398                                   const char *host_str)
 399 {
 400     NetSocketListenState *s;
 401     int fd, val, ret;
 402     struct sockaddr_in saddr;
 403
 404     if (parse_host_port(&saddr, host_str) < 0)
 405         return -1;
 406
 407     s = qemu_mallocz(sizeof(NetSocketListenState));
 408
 409     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 410     if (fd < 0) {
 411         perror("socket");
 412         return -1;
 413     }
 414     socket_set_nonblock(fd);
 415
 416     /* allow fast reuse */
 417     val = 1;
 418     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
 419
 420     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 421     if (ret < 0) {
 422         perror("bind");
 423         return -1;
 424     }
 425     ret = listen(fd, 0);
 426     if (ret < 0) {
 427         perror("listen");
 428         return -1;
 429     }
 430     s->vlan = vlan;
 431     s->model = qemu_strdup(model);
 432     s->name = name ? qemu_strdup(name) : NULL;
 433     s->fd = fd;
 434     qemu_set_fd_handler(fd, net_socket_accept, NULL, s);
 435     return 0;
 436 }
 437
 438 static int net_socket_connect_init(VLANState *vlan,
 439                                    const char *model,
 440                                    const char *name,
 441                                    const char *host_str)
 442 {
 443     NetSocketState *s;
 444     int fd, connected, ret, err;
 445     struct sockaddr_in saddr;
 446
 447     if (parse_host_port(&saddr, host_str) < 0)
 448         return -1;
 449
 450     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 451     if (fd < 0) {
 452         perror("socket");
 453         return -1;
 454     }
 455     socket_set_nonblock(fd);
 456
 457     connected = 0;
 458     for(;;) {
 459         ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 460         if (ret < 0) {
 461             err = socket_error();
 462             if (err == EINTR || err == EWOULDBLOCK) {
 463             } else if (err == EINPROGRESS) {
 464                 break;
 465 #ifdef _WIN32
 466             } else if (err == WSAEALREADY || err == WSAEINVAL) {
 467                 break;
 468 #endif
 469             } else {
 470                 perror("connect");
 471                 closesocket(fd);
 472                 return -1;
 473             }
 474         } else {
 475             connected = 1;
 476             break;
 477         }
 478     }
 479     s = net_socket_fd_init(vlan, model, name, fd, connected);
 480     if (!s)
 481         return -1;
 482     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 483              "socket: connect to %s:%d",
 484              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 485     return 0;
 486 }
 487
 488 static int net_socket_mcast_init(VLANState *vlan,
 489                                  const char *model,
 490                                  const char *name,
 491                                  const char *host_str,
 492                                  const char *localaddr_str)
 493 {
 494     NetSocketState *s;
 495     int fd;
 496     struct sockaddr_in saddr;
 497     struct in_addr localaddr, *param_localaddr;
 498
 499     if (parse_host_port(&saddr, host_str) < 0)
 500         return -1;
 501
 502     if (localaddr_str != NULL) {
 503         if (inet_aton(localaddr_str, &localaddr) == 0)
 504             return -1;
 505         param_localaddr = &localaddr;
 506     } else {
 507         param_localaddr = NULL;
 508     }
 509
 510     fd = net_socket_mcast_create(&saddr, param_localaddr);
 511     if (fd < 0)
 512         return -1;
 513
 514     s = net_socket_fd_init(vlan, model, name, fd, 0);
 515     if (!s)
 516         return -1;
 517
 518     s->dgram_dst = saddr;
 519
 520     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 521              "socket: mcast=%s:%d",
 522              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 523     return 0;
 524
 525 }
 526
 527 int net_init_socket(QemuOpts *opts,
 528                     Monitor *mon,
 529                     const char *name,
 530                     VLANState *vlan)
 531 {
 532     if (qemu_opt_get(opts, "fd")) {
 533         int fd;
 534
 535         if (qemu_opt_get(opts, "listen") ||
 536             qemu_opt_get(opts, "connect") ||
 537             qemu_opt_get(opts, "mcast") ||
 538             qemu_opt_get(opts, "localaddr")) {
 539             error_report("listen=, connect=, mcast= and localaddr= is invalid with fd=");
 540             return -1;
 541         }
 542
 543         fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
 544         if (fd == -1) {
 545             return -1;
 546         }
 547
 548         if (!net_socket_fd_init(vlan, "socket", name, fd, 1)) {
 549             close(fd);
 550             return -1;
 551         }
 552     } else if (qemu_opt_get(opts, "listen")) {
 553         const char *listen;
 554
 555         if (qemu_opt_get(opts, "fd") ||
 556             qemu_opt_get(opts, "connect") ||
 557             qemu_opt_get(opts, "mcast") ||
 558             qemu_opt_get(opts, "localaddr")) {
 559             error_report("fd=, connect=, mcast= and localaddr= is invalid with listen=");
 560             return -1;
 561         }
 562
 563         listen = qemu_opt_get(opts, "listen");
 564
 565         if (net_socket_listen_init(vlan, "socket", name, listen) == -1) {
 566             return -1;
 567         }
 568     } else if (qemu_opt_get(opts, "connect")) {
 569         const char *connect;
 570
 571         if (qemu_opt_get(opts, "fd") ||
 572             qemu_opt_get(opts, "listen") ||
 573             qemu_opt_get(opts, "mcast") ||
 574             qemu_opt_get(opts, "localaddr")) {
 575             error_report("fd=, listen=, mcast= and localaddr= is invalid with connect=");
 576             return -1;
 577         }
 578
 579         connect = qemu_opt_get(opts, "connect");
 580
 581         if (net_socket_connect_init(vlan, "socket", name, connect) == -1) {
 582             return -1;
 583         }
 584     } else if (qemu_opt_get(opts, "mcast")) {
 585         const char *mcast, *localaddr;
 586
 587         if (qemu_opt_get(opts, "fd") ||
 588             qemu_opt_get(opts, "connect") ||
 589             qemu_opt_get(opts, "listen")) {
 590             error_report("fd=, connect= and listen= is invalid with mcast=");
 591             return -1;
 592         }
 593
 594         mcast = qemu_opt_get(opts, "mcast");
 595         localaddr = qemu_opt_get(opts, "localaddr");
 596
 597         if (net_socket_mcast_init(vlan, "socket", name, mcast, localaddr) == -1) {
 598             return -1;
 599         }
 600     } else {
 601         error_report("-socket requires fd=, listen=, connect= or mcast=");
 602         return -1;
 603     }
 604
 605     return 0;
 606 }