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, struct in_addr *localaddr)
 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     if (localaddr) {
 187         imr.imr_interface = *localaddr;
 188     } else {
 189         imr.imr_interface.s_addr = htonl(INADDR_ANY);
 190     }
 191
 192     ret = setsockopt(fd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
 193                      (const char *)&imr, sizeof(struct ip_mreq));
 194     if (ret < 0) {
 195         perror("setsockopt(IP_ADD_MEMBERSHIP)");
 196         goto fail;
 197     }
 198
 199     /* Force mcast msgs to loopback (eg. several QEMUs in same host */
 200     val = 1;
 201     ret=setsockopt(fd, IPPROTO_IP, IP_MULTICAST_LOOP,
 202                    (const char *)&val, sizeof(val));
 203     if (ret < 0) {
 204         perror("setsockopt(SOL_IP, IP_MULTICAST_LOOP)");
 205         goto fail;
 206     }
 207
 208     /* If a bind address is given, only send packets from that address */
 209     if (localaddr != NULL) {
 210         ret = setsockopt(fd, IPPROTO_IP, IP_MULTICAST_IF,
 211                          (const char *)localaddr, sizeof(*localaddr));
 212         if (ret < 0) {
 213             perror("setsockopt(IP_MULTICAST_IF)");
 214             goto fail;
 215         }
 216     }
 217
 218     socket_set_nonblock(fd);
 219     return fd;
 220 fail:
 221     if (fd >= 0)
 222         closesocket(fd);
 223     return -1;
 224 }
 225
 226 static void net_socket_cleanup(VLANClientState *nc)
 227 {
 228     NetSocketState *s = DO_UPCAST(NetSocketState, nc, nc);
 229     qemu_set_fd_handler(s->fd, NULL, NULL, NULL);
 230     close(s->fd);
 231 }
 232
 233 static NetClientInfo net_dgram_socket_info = {
 234     .type = NET_CLIENT_TYPE_SOCKET,
 235     .size = sizeof(NetSocketState),
 236     .receive = net_socket_receive_dgram,
 237     .cleanup = net_socket_cleanup,
 238 };
 239
 240 static NetSocketState *net_socket_fd_init_dgram(VLANState *vlan,
 241                                                 const char *model,
 242                                                 const char *name,
 243                                                 int fd, int is_connected)
 244 {
 245     struct sockaddr_in saddr;
 246     int newfd;
 247     socklen_t saddr_len;
 248     VLANClientState *nc;
 249     NetSocketState *s;
 250
 251     /* fd passed: multicast: "learn" dgram_dst address from bound address and save it
 252      * Because this may be "shared" socket from a "master" process, datagrams would be recv()
 253      * by ONLY ONE process: we must "clone" this dgram socket --jjo
 254      */
 255
 256     if (is_connected) {
 257         if (getsockname(fd, (struct sockaddr *) &saddr, &saddr_len) == 0) {
 258             /* must be bound */
 259             if (saddr.sin_addr.s_addr==0) {
 260                 fprintf(stderr, "qemu: error: init_dgram: fd=%d unbound, cannot setup multicast dst addr\n",
 261                         fd);
 262                 return NULL;
 263             }
 264             /* clone dgram socket */
 265             newfd = net_socket_mcast_create(&saddr, NULL);
 266             if (newfd < 0) {
 267                 /* error already reported by net_socket_mcast_create() */
 268                 close(fd);
 269                 return NULL;
 270             }
 271             /* clone newfd to fd, close newfd */
 272             dup2(newfd, fd);
 273             close(newfd);
 274
 275         } else {
 276             fprintf(stderr, "qemu: error: init_dgram: fd=%d failed getsockname(): %s\n",
 277                     fd, strerror(errno));
 278             return NULL;
 279         }
 280     }
 281
 282     nc = qemu_new_net_client(&net_dgram_socket_info, vlan, NULL, model, name);
 283
 284     snprintf(nc->info_str, sizeof(nc->info_str),
 285             "socket: fd=%d (%s mcast=%s:%d)",
 286             fd, is_connected ? "cloned" : "",
 287             inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 288
 289     s = DO_UPCAST(NetSocketState, nc, nc);
 290
 291     s->fd = fd;
 292
 293     qemu_set_fd_handler(s->fd, net_socket_send_dgram, NULL, s);
 294
 295     /* mcast: save bound address as dst */
 296     if (is_connected) s->dgram_dst=saddr;
 297
 298     return s;
 299 }
 300
 301 static void net_socket_connect(void *opaque)
 302 {
 303     NetSocketState *s = opaque;
 304     qemu_set_fd_handler(s->fd, net_socket_send, NULL, s);
 305 }
 306
 307 static NetClientInfo net_socket_info = {
 308     .type = NET_CLIENT_TYPE_SOCKET,
 309     .size = sizeof(NetSocketState),
 310     .receive = net_socket_receive,
 311     .cleanup = net_socket_cleanup,
 312 };
 313
 314 static NetSocketState *net_socket_fd_init_stream(VLANState *vlan,
 315                                                  const char *model,
 316                                                  const char *name,
 317                                                  int fd, int is_connected)
 318 {
 319     VLANClientState *nc;
 320     NetSocketState *s;
 321
 322     nc = qemu_new_net_client(&net_socket_info, vlan, NULL, model, name);
 323
 324     snprintf(nc->info_str, sizeof(nc->info_str), "socket: fd=%d", fd);
 325
 326     s = DO_UPCAST(NetSocketState, nc, nc);
 327
 328     s->fd = fd;
 329
 330     if (is_connected) {
 331         net_socket_connect(s);
 332     } else {
 333         qemu_set_fd_handler(s->fd, NULL, net_socket_connect, s);
 334     }
 335     return s;
 336 }
 337
 338 static NetSocketState *net_socket_fd_init(VLANState *vlan,
 339                                           const char *model, const char *name,
 340                                           int fd, int is_connected)
 341 {
 342     int so_type = -1, optlen=sizeof(so_type);
 343
 344     if(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&so_type,
 345         (socklen_t *)&optlen)< 0) {
 346         fprintf(stderr, "qemu: error: getsockopt(SO_TYPE) for fd=%d failed\n", fd);
 347         return NULL;
 348     }
 349     switch(so_type) {
 350     case SOCK_DGRAM:
 351         return net_socket_fd_init_dgram(vlan, model, name, fd, is_connected);
 352     case SOCK_STREAM:
 353         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
 354     default:
 355         /* who knows ... this could be a eg. a pty, do warn and continue as stream */
 356         fprintf(stderr, "qemu: warning: socket type=%d for fd=%d is not SOCK_DGRAM or SOCK_STREAM\n", so_type, fd);
 357         return net_socket_fd_init_stream(vlan, model, name, fd, is_connected);
 358     }
 359     return NULL;
 360 }
 361
 362 static void net_socket_accept(void *opaque)
 363 {
 364     NetSocketListenState *s = opaque;
 365     NetSocketState *s1;
 366     struct sockaddr_in saddr;
 367     socklen_t len;
 368     int fd;
 369
 370     for(;;) {
 371         len = sizeof(saddr);
 372         fd = qemu_accept(s->fd, (struct sockaddr *)&saddr, &len);
 373         if (fd < 0 && errno != EINTR) {
 374             return;
 375         } else if (fd >= 0) {
 376             break;
 377         }
 378     }
 379     s1 = net_socket_fd_init(s->vlan, s->model, s->name, fd, 1);
 380     if (!s1) {
 381         closesocket(fd);
 382     } else {
 383         snprintf(s1->nc.info_str, sizeof(s1->nc.info_str),
 384                  "socket: connection from %s:%d",
 385                  inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 386     }
 387 }
 388
 389 static int net_socket_listen_init(VLANState *vlan,
 390                                   const char *model,
 391                                   const char *name,
 392                                   const char *host_str)
 393 {
 394     NetSocketListenState *s;
 395     int fd, val, ret;
 396     struct sockaddr_in saddr;
 397
 398     if (parse_host_port(&saddr, host_str) < 0)
 399         return -1;
 400
 401     s = qemu_mallocz(sizeof(NetSocketListenState));
 402
 403     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 404     if (fd < 0) {
 405         perror("socket");
 406         return -1;
 407     }
 408     socket_set_nonblock(fd);
 409
 410     /* allow fast reuse */
 411     val = 1;
 412     setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
 413
 414     ret = bind(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 415     if (ret < 0) {
 416         perror("bind");
 417         return -1;
 418     }
 419     ret = listen(fd, 0);
 420     if (ret < 0) {
 421         perror("listen");
 422         return -1;
 423     }
 424     s->vlan = vlan;
 425     s->model = qemu_strdup(model);
 426     s->name = name ? qemu_strdup(name) : NULL;
 427     s->fd = fd;
 428     qemu_set_fd_handler(fd, net_socket_accept, NULL, s);
 429     return 0;
 430 }
 431
 432 static int net_socket_connect_init(VLANState *vlan,
 433                                    const char *model,
 434                                    const char *name,
 435                                    const char *host_str)
 436 {
 437     NetSocketState *s;
 438     int fd, connected, ret, err;
 439     struct sockaddr_in saddr;
 440
 441     if (parse_host_port(&saddr, host_str) < 0)
 442         return -1;
 443
 444     fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
 445     if (fd < 0) {
 446         perror("socket");
 447         return -1;
 448     }
 449     socket_set_nonblock(fd);
 450
 451     connected = 0;
 452     for(;;) {
 453         ret = connect(fd, (struct sockaddr *)&saddr, sizeof(saddr));
 454         if (ret < 0) {
 455             err = socket_error();
 456             if (err == EINTR || err == EWOULDBLOCK) {
 457             } else if (err == EINPROGRESS) {
 458                 break;
 459 #ifdef _WIN32
 460             } else if (err == WSAEALREADY) {
 461                 break;
 462 #endif
 463             } else {
 464                 perror("connect");
 465                 closesocket(fd);
 466                 return -1;
 467             }
 468         } else {
 469             connected = 1;
 470             break;
 471         }
 472     }
 473     s = net_socket_fd_init(vlan, model, name, fd, connected);
 474     if (!s)
 475         return -1;
 476     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 477              "socket: connect to %s:%d",
 478              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 479     return 0;
 480 }
 481
 482 static int net_socket_mcast_init(VLANState *vlan,
 483                                  const char *model,
 484                                  const char *name,
 485                                  const char *host_str,
 486                                  const char *localaddr_str)
 487 {
 488     NetSocketState *s;
 489     int fd;
 490     struct sockaddr_in saddr;
 491     struct in_addr localaddr, *param_localaddr;
 492
 493     if (parse_host_port(&saddr, host_str) < 0)
 494         return -1;
 495
 496     if (localaddr_str != NULL) {
 497         if (inet_aton(localaddr_str, &localaddr) == 0)
 498             return -1;
 499         param_localaddr = &localaddr;
 500     } else {
 501         param_localaddr = NULL;
 502     }
 503
 504     fd = net_socket_mcast_create(&saddr, param_localaddr);
 505     if (fd < 0)
 506         return -1;
 507
 508     s = net_socket_fd_init(vlan, model, name, fd, 0);
 509     if (!s)
 510         return -1;
 511
 512     s->dgram_dst = saddr;
 513
 514     snprintf(s->nc.info_str, sizeof(s->nc.info_str),
 515              "socket: mcast=%s:%d",
 516              inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
 517     return 0;
 518
 519 }
 520
 521 int net_init_socket(QemuOpts *opts,
 522                     Monitor *mon,
 523                     const char *name,
 524                     VLANState *vlan)
 525 {
 526     if (qemu_opt_get(opts, "fd")) {
 527         int fd;
 528
 529         if (qemu_opt_get(opts, "listen") ||
 530             qemu_opt_get(opts, "connect") ||
 531             qemu_opt_get(opts, "mcast") ||
 532             qemu_opt_get(opts, "localaddr")) {
 533             error_report("listen=, connect=, mcast= and localaddr= is invalid with fd=\n");
 534             return -1;
 535         }
 536
 537         fd = net_handle_fd_param(mon, qemu_opt_get(opts, "fd"));
 538         if (fd == -1) {
 539             return -1;
 540         }
 541
 542         if (!net_socket_fd_init(vlan, "socket", name, fd, 1)) {
 543             close(fd);
 544             return -1;
 545         }
 546     } else if (qemu_opt_get(opts, "listen")) {
 547         const char *listen;
 548
 549         if (qemu_opt_get(opts, "fd") ||
 550             qemu_opt_get(opts, "connect") ||
 551             qemu_opt_get(opts, "mcast") ||
 552             qemu_opt_get(opts, "localaddr")) {
 553             error_report("fd=, connect=, mcast= and localaddr= is invalid with listen=\n");
 554             return -1;
 555         }
 556
 557         listen = qemu_opt_get(opts, "listen");
 558
 559         if (net_socket_listen_init(vlan, "socket", name, listen) == -1) {
 560             return -1;
 561         }
 562     } else if (qemu_opt_get(opts, "connect")) {
 563         const char *connect;
 564
 565         if (qemu_opt_get(opts, "fd") ||
 566             qemu_opt_get(opts, "listen") ||
 567             qemu_opt_get(opts, "mcast") ||
 568             qemu_opt_get(opts, "localaddr")) {
 569             error_report("fd=, listen=, mcast= and localaddr= is invalid with connect=\n");
 570             return -1;
 571         }
 572
 573         connect = qemu_opt_get(opts, "connect");
 574
 575         if (net_socket_connect_init(vlan, "socket", name, connect) == -1) {
 576             return -1;
 577         }
 578     } else if (qemu_opt_get(opts, "mcast")) {
 579         const char *mcast, *localaddr;
 580
 581         if (qemu_opt_get(opts, "fd") ||
 582             qemu_opt_get(opts, "connect") ||
 583             qemu_opt_get(opts, "listen")) {
 584             error_report("fd=, connect= and listen= is invalid with mcast=");
 585             return -1;
 586         }
 587
 588         mcast = qemu_opt_get(opts, "mcast");
 589         localaddr = qemu_opt_get(opts, "localaddr");
 590
 591         if (net_socket_mcast_init(vlan, "socket", name, mcast, localaddr) == -1) {
 592             return -1;
 593         }
 594     } else {
 595         error_report("-socket requires fd=, listen=, connect= or mcast=");
 596         return -1;
 597     }
 598
 599     return 0;
 600 }