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 = recv(s->fd, (void *)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 = recv(s->fd, (void *)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)
 153 {
 154     struct ip_mreq imr;
 155     int fd;
 156     int val, ret;
 157     if (!IN_MULTICAST(ntohl(mcastaddr->sin_addr.s_addr))) {
 158         fprintf(stderr, "qemu: error: specified mcastaddr \"%s\" (0x%08x) does not contain a multicast address\n",
 159                 inet_ntoa(mcastaddr->sin_addr),
 160                 (int)ntohl(mcastaddr->sin_addr.s_addr));
 161         return -1;
 162
 163     }
 164     fd = qemu_socket(PF_INET, SOCK_DGRAM, 0);
 165     if (fd < 0) {
 166         perror("socket(PF_INET, SOCK_DGRAM)");
 167         return -1;
 168     }
 169
 170     val = 1;
 171     ret=setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
 172                    (const char *)&val, sizeof(val));
 173     if (ret < 0) {
 174         perror("setsockopt(SOL_SOCKET, SO_REUSEADDR)");
 175         goto fail;
 176     }
 177
 178     ret = bind(fd, (struct sockaddr *)mcastaddr, sizeof(*mcastaddr));
 179     if (ret < 0) {
 180         perror("bind");
 181         goto fail;
 182     }
 183
 184     /* Add host to multicast group */
 185     imr.imr_multiaddr = mcastaddr->sin_addr;
 186     imr.imr_interface.s_addr = htonl(INADDR_ANY);
 187
 188     ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 189                      (const char *)&imr, sizeof(struct ip_mreq));
 190     if (ret < 0) {
 191         perror("setsockopt(IP_ADD_MEMBERSHIP)");
 192         goto fail;
 193     }
 194
 195     /* Force mcast msgs to loopback (eg. several QEMUs in same host */
 196     val = 1;
 197     ret=setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 198                    (const char *)&val, sizeof(val));
 199     if (ret < 0) {
 200         perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
 201         goto fail;
 202     }
 203
 204     socket_set_nonblock(fd);
 205     return fd;
 206 fail:
 207     if (fd >= 0)
 208         closesocket(fd);
 209     return -1;
 210 }
 211
 212 static void net_socket_cleanup(VLANClientState *nc)
 213 {
 214     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 215     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 216     close(s->fd);
 217 }
 218
 219 static NetClientInfo net_dgram_socket_info = {
 220     .type = NET_CLIENT_TYPE_SOCKET,
 221     .size = sizeof(NetSocketState),
 222     .receive = net_socket_receive_dgram,
 223     .cleanup = net_socket_cleanup,
 224 };
 225
 226 static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan,
 227                                                 const char *model,
 228                                                 const char *name,
 229                                                 int fd, int is_connected)
 230 {
 231     struct sockaddr_in saddr;
 232     int newfd;
 233     socklen_t saddr_len;
 234     VLANClientState *nc;
 235     NetSocketState *s;
 236
 237     /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
 238      * Because this may be "shared" socket from a "master" process, datagrams would be recv()
 239      * by ONLY ONE process: we must "clone" this dgram socket --jjo
 240      */
 241
 242     if (is_connected) {
 243         if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
 244             /* must be bound */
 245             if (saddr.sin_addr.s_addr==0) {
 246                 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, cannot setup multicast dst addr\n",
 247                         fd);
 248                 return NULL;
 249             }
 250             /* clone dgram socket */
 251             newfd = net_socket_mcast_create(&saddr);
 252             if (newfd < 0) {
 253                 /* error already reported by net_socket_mcast_create() */
 254                 close(fd);
 255                 return NULL;
 256             }
 257             /* clone newfd to fd, close newfd */
 258             dup2(newfd, fd);
 259             close(newfd);
 260
 261         } else {
 262             fprintf(stderr, "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
 263                     fd, strerror(errno));
 264             return NULL;
 265         }
 266     }
 267
 268     nc = qemu_new_net_client(&net_dgram_socket_info, vlan, NULL, model, name);
 269
 270     snprintf(nc->info_str, sizeof(nc->info_str),
 271             "socket: fd=%d (%s mcast=%s:%d)",
 272             fd, is_connected ? "cloned" : "",
 273             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 274
 275     s = DO_UPCAST(NetSocketState, nc, nc);
 276
 277     s->fd = fd;
 278
 279     qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
 280
 281     /* mcast: save bound address as dst */
 282     if (is_connected) s->dgram_dst=saddr;
 283
 284     return s;
 285 }
 286
 287 static void net_socket_connect(void *opaque)
 288 {
 289     NetSocketState *s = opaque;
 290     qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
 291 }
 292
 293 static NetClientInfo net_socket_info = {
 294     .type = NET_CLIENT_TYPE_SOCKET,
 295     .size = sizeof(NetSocketState),
 296     .receive = net_socket_receive,
 297     .cleanup = net_socket_cleanup,
 298 };
 299
 300 static NetSocketState *net_socket_fd_init_stream(VLANState *vlan,
 301                                                  const char *model,
 302                                                  const char *name,
 303                                                  int fd, int is_connected)
 304 {
 305     VLANClientState *nc;
 306     NetSocketState *s;
 307
 308     nc = qemu_new_net_client(&net_socket_info, vlan, NULL, model, name);
 309
 310     snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
 311
 312     s = DO_UPCAST(NetSocketState, nc, nc);
 313
 314     s->fd = fd;
 315
 316     if (is_connected) {
 317         net_socket_connect(s);
 318     } else {
 319         qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
 320     }
 321     return s;
 322 }
 323
 324 static NetSocketState *net_socket_fd_init(VLANState *vlan,
 325                                           const char *model, const char *name,
 326                                           int fd, int is_connected)
 327 {
 328     int so_type = -1, optlen=sizeof(so_type);
 329
 330     if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
 331         (socklen_t *)&optlen)< 0) {
 332         fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n", fd);
 333         return NULL;
 334     }
 335     switch(so_type) {
 336     case SOCK_DGRAM:
 337         return net_socket_fd_init_dgram(vlan, model, name, fd, is_connected);
 338     case SOCK_STREAM:
 339         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
 340     default:
 341         /* who knows ... this could be a eg. a pty, do warn and continue as stream */
 342         fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
 343         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
 344     }
 345     return NULL;
 346 }
 347
 348 static void net_socket_accept(void *opaque)
 349 {
 350     NetSocketListenState *s = opaque;
 351     NetSocketState *s1;
 352     struct sockaddr_in saddr;
 353     socklen_t len;
 354     int fd;
 355
 356     for(;;) {
 357         len = sizeof(saddr);
 358         fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
 359         if (fd < 0 && errno != EINTR) {
 360             return;
 361         } else if (fd >= 0) {
 362             break;
 363         }
 364     }
 365     s1 = net_socket_fd_init(s->vlan, s->model, s->name, fd, 1);
 366     if (!s1) {
 367         closesocket(fd);
 368     } else {
 369         snprintf(s1->nc.info_str, sizeof(s1->nc.info_str),
 370                  "socket: connection from %s:%d",
 371                  inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 372     }
 373 }
 374
 375 static int net_socket_listen_init(VLANState *vlan,
 376                                   const char *model,
 377                                   const char *name,
 378                                   const char *host_str)
 379 {
 380     NetSocketListenState *s;
 381     int fd, val, ret;
 382     struct sockaddr_in saddr;
 383
 384     if (parse_host_port(&saddr, host_str) < 0)
 385         return -1;
 386
 387     s = qemu_mallocz(sizeof(NetSocketListenState));
 388
 389     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 390     if (fd < 0) {
 391         perror("socket");
 392         return -1;
 393     }
 394     socket_set_nonblock(fd);
 395
 396     /* allow fast reuse */
 397     val = 1;
 398     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
 399
 400     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 401     if (ret < 0) {
 402         perror("bind");
 403         return -1;
 404     }
 405     ret = listen(fd, 0);
 406     if (ret < 0) {
 407         perror("listen");
 408         return -1;
 409     }
 410     s->vlan = vlan;
 411     s->model = qemu_strdup(model);
 412     s->name = name ? qemu_strdup(name) : NULL;
 413     s->fd = fd;
 414     qemu_set_fd_handler(fd, net_socket_accept, NULL, s);
 415     return 0;
 416 }
 417
 418 static int net_socket_connect_init(VLANState *vlan,
 419                                    const char *model,
 420                                    const char *name,
 421                                    const char *host_str)
 422 {
 423     NetSocketState *s;
 424     int fd, connected, ret, err;
 425     struct sockaddr_in saddr;
 426
 427     if (parse_host_port(&saddr, host_str) < 0)
 428         return -1;
 429
 430     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 431     if (fd < 0) {
 432         perror("socket");
 433         return -1;
 434     }
 435     socket_set_nonblock(fd);
 436
 437     connected = 0;
 438     for(;;) {
 439         ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 440         if (ret < 0) {
 441             err = socket_error();
 442             if (err == EINTR || err == EWOULDBLOCK) {
 443             } else if (err == EINPROGRESS) {
 444                 break;
 445 #ifdef _WIN32
 446             } else if (err == WSAEALREADY) {
 447                 break;
 448 #endif
 449             } else {
 450                 perror("connect");
 451                 closesocket(fd);
 452                 return -1;
 453             }
 454         } else {
 455             connected = 1;
 456             break;
 457         }
 458     }
 459     s = net_socket_fd_init(vlan, model, name, fd, connected);
 460     if (!s)
 461         return -1;
 462     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 463              "socket: connect to %s:%d",
 464              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 465     return 0;
 466 }
 467
 468 static int net_socket_mcast_init(VLANState *vlan,
 469                                  const char *model,
 470                                  const char *name,
 471                                  const char *host_str)
 472 {
 473     NetSocketState *s;
 474     int fd;
 475     struct sockaddr_in saddr;
 476
 477     if (parse_host_port(&saddr, host_str) < 0)
 478         return -1;
 479
 480
 481     fd = net_socket_mcast_create(&saddr);
 482     if (fd < 0)
 483         return -1;
 484
 485     s = net_socket_fd_init(vlan, model, name, fd, 0);
 486     if (!s)
 487         return -1;
 488
 489     s->dgram_dst = saddr;
 490
 491     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 492              "socket: mcast=%s:%d",
 493              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 494     return 0;
 495
 496 }
 497
 498 int net_init_socket(QemuOpts *opts,
 499                     Monitor *mon,
 500                     const char *name,
 501                     VLANState *vlan)
 502 {
 503     if (qemu_opt_get(opts, "fd")) {
 504         int fd;
 505
 506         if (qemu_opt_get(opts, "listen") ||
 507             qemu_opt_get(opts, "connect") ||
 508             qemu_opt_get(opts, "mcast")) {
 509             error_report("listen=, connect= and mcast= is invalid with fd=");
 510             return -1;
 511         }
 512
 513         fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
 514         if (fd == -1) {
 515             return -1;
 516         }
 517
 518         if (!net_socket_fd_init(vlan, "socket", name, fd, 1)) {
 519             close(fd);
 520             return -1;
 521         }
 522     } else if (qemu_opt_get(opts, "listen")) {
 523         const char *listen;
 524
 525         if (qemu_opt_get(opts, "fd") ||
 526             qemu_opt_get(opts, "connect") ||
 527             qemu_opt_get(opts, "mcast")) {
 528             error_report("fd=, connect= and mcast= is invalid with listen=");
 529             return -1;
 530         }
 531
 532         listen = qemu_opt_get(opts, "listen");
 533
 534         if (net_socket_listen_init(vlan, "socket", name, listen) == -1) {
 535             return -1;
 536         }
 537     } else if (qemu_opt_get(opts, "connect")) {
 538         const char *connect;
 539
 540         if (qemu_opt_get(opts, "fd") ||
 541             qemu_opt_get(opts, "listen") ||
 542             qemu_opt_get(opts, "mcast")) {
 543             error_report("fd=, listen= and mcast= is invalid with connect=");
 544             return -1;
 545         }
 546
 547         connect = qemu_opt_get(opts, "connect");
 548
 549         if (net_socket_connect_init(vlan, "socket", name, connect) == -1) {
 550             return -1;
 551         }
 552     } else if (qemu_opt_get(opts, "mcast")) {
 553         const char *mcast;
 554
 555         if (qemu_opt_get(opts, "fd") ||
 556             qemu_opt_get(opts, "connect") ||
 557             qemu_opt_get(opts, "listen")) {
 558             error_report("fd=, connect= and listen= is invalid with mcast=");
 559             return -1;
 560         }
 561
 562         mcast = qemu_opt_get(opts, "mcast");
 563
 564         if (net_socket_mcast_init(vlan, "socket", name, mcast) == -1) {
 565             return -1;
 566         }
 567     } else {
 568         error_report("-socket requires fd=, listen=, connect= or mcast=");
 569         return -1;
 570     }
 571
 572     return 0;
 573 }