lib/socket.c

   1 /*
   2    Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as published by
   6    the Free Software Foundation; either version 2.1 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.
  16 */
  17 #ifdef HAVE_CONFIG_H
  18 #include "config.h"
  19 #endif
  20
  21 #ifdef AROS
  22 #include "aros_compat.h"
  23 #endif
  24
  25 #ifdef WIN32
  26 #include "win32_compat.h"
  27 #endif
  28
  29 #ifdef HAVE_ARPA_INET_H
  30 #include <arpa/inet.h>
  31 #endif
  32
  33 #ifdef HAVE_POLL_H
  34 #include <poll.h>
  35 #endif
  36
  37 #ifdef HAVE_UNISTD_H
  38 #include <unistd.h>
  39 #endif
  40
  41 #ifdef HAVE_SYS_IOCTL_H
  42 #include <sys/ioctl.h>
  43 #endif
  44
  45 #ifdef HAVE_SYS_SOCKET_H
  46 #include <sys/socket.h>
  47 #endif
  48
  49 #ifdef HAVE_NETINET_TCP_H
  50 #include <netinet/tcp.h>
  51 #endif
  52
  53 #ifdef HAVE_NETDB_H
  54 #include <netdb.h>
  55 #endif
  56
  57 #ifdef HAVE_SYS_FILIO_H
  58 #include <sys/filio.h>
  59 #endif
  60
  61 #ifdef HAVE_SYS_SOCKIO_H
  62 #include <sys/sockio.h>
  63 #endif
  64
  65 #include <stdio.h>
  66 #include <stdlib.h>
  67 #include <assert.h>
  68 #include <fcntl.h>
  69 #include <string.h>
  70 #include <errno.h>
  71 #include <sys/types.h>
  72 #include "libnfs-zdr.h"
  73 #include "libnfs.h"
  74 #include "libnfs-raw.h"
  75 #include "libnfs-private.h"
  76 #include "slist.h"
  77
  78 #ifdef WIN32
  79 //has to be included after stdlib!!
  80 #include "win32_errnowrapper.h"
  81 #endif
  82
  83
  84 static int rpc_reconnect_requeue(struct rpc_context *rpc);
  85 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s);
  86
  87 static void set_nonblocking(int fd)
  88 {
  89         int v = 0;
  90 #if defined(WIN32)
  91         long nonblocking=1;
  92         v = ioctl(fd, FIONBIO, &nonblocking);
  93 #else
  94         v = fcntl(fd, F_GETFL, 0);
  95         fcntl(fd, F_SETFL, v | O_NONBLOCK);
  96 #endif //FIXME
  97 }
  98
  99 #ifdef HAVE_NETINET_TCP_H
 100 int set_tcp_sockopt(int sockfd, int optname, int value)
 101 {
 102         int level;
 103
 104         #if defined(__FreeBSD__) || defined(__sun) || (defined(__APPLE__) && defined(__MACH__))
 105         struct protoent *buf;
 106
 107         if ((buf = getprotobyname("tcp")) != NULL)
 108                 level = buf->p_proto;
 109         else
 110                 return -1;
 111         #else
 112                 level = SOL_TCP;
 113         #endif
 114
 115         return setsockopt(sockfd, level, optname, (char *)&value, sizeof(value));
 116 }
 117 #endif
 118
 119 int rpc_get_fd(struct rpc_context *rpc)
 120 {
 121         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 122
 123         return rpc->fd;
 124 }
 125
 126 int rpc_which_events(struct rpc_context *rpc)
 127 {
 128         int events;
 129
 130         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 131
 132         events = rpc->is_connected ? POLLIN : POLLOUT;
 133
 134         if (rpc->is_udp != 0) {
 135                 /* for udp sockets we only wait for pollin */
 136                 return POLLIN;
 137         }
 138
 139         if (rpc->outqueue) {
 140                 events |= POLLOUT;
 141         }
 142         return events;
 143 }
 144
 145 static int rpc_write_to_socket(struct rpc_context *rpc)
 146 {
 147         int32_t count;
 148
 149         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 150
 151         if (rpc->fd == -1) {
 152                 rpc_set_error(rpc, "trying to write but not connected");
 153                 return -1;
 154         }
 155
 156         while (rpc->outqueue != NULL) {
 157                 int64_t total;
 158
 159                 total = rpc->outqueue->outdata.size;
 160
 161                 count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
 162                 if (count == -1) {
 163                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 164                                 return 0;
 165                         }
 166                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 167                         return -1;
 168                 }
 169
 170                 rpc->outqueue->written += count;
 171                 if (rpc->outqueue->written == total) {
 172                         struct rpc_pdu *pdu = rpc->outqueue;
 173
 174                         SLIST_REMOVE(&rpc->outqueue, pdu);
 175                         SLIST_ADD_END(&rpc->waitpdu, pdu);
 176                 }
 177         }
 178         return 0;
 179 }
 180
 181 static int rpc_read_from_socket(struct rpc_context *rpc)
 182 {
 183         int available;
 184         int size;
 185         int pdu_size;
 186         int32_t count;
 187
 188         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 189
 190         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 191                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 192                 return -1;
 193         }
 194
 195         if (available == 0) {
 196                 rpc_set_error(rpc, "Socket has been closed");
 197                 return -1;
 198         }
 199
 200         if (rpc->is_udp) {
 201                 char *buf;
 202                 socklen_t socklen = sizeof(rpc->udp_src);
 203
 204                 buf = malloc(available);
 205                 if (buf == NULL) {
 206                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 207                         return -1;
 208                 }
 209                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 210                 if (count < 0) {
 211                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 212                         free(buf);
 213                 }
 214                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 215                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 216                         free(buf);
 217                         return -1;
 218                 }
 219                 free(buf);
 220                 return 0;
 221         }
 222
 223         /* read record marker, 4 bytes at the beginning of every pdu */
 224         if (rpc->inbuf == NULL) {
 225                 rpc->insize = 4;
 226                 rpc->inbuf = malloc(rpc->insize);
 227                 if (rpc->inbuf == NULL) {
 228                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 229                         return -1;
 230                 }
 231         }
 232         if (rpc->inpos < 4) {
 233                 size = 4 - rpc->inpos;
 234
 235                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 236                 if (count == -1) {
 237                         if (errno == EINTR) {
 238                                 return 0;
 239                         }
 240                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 241                         return -1;
 242                 }
 243                 available  -= count;
 244                 rpc->inpos += count;
 245         }
 246
 247         if (available == 0) {
 248                 return 0;
 249         }
 250
 251         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 252         if (rpc->insize < pdu_size) {
 253                 unsigned char *buf;
 254
 255                 buf = malloc(pdu_size);
 256                 if (buf == NULL) {
 257                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 258                         return -1;
 259                 }
 260                 memcpy(buf, rpc->inbuf, rpc->insize);
 261                 free(rpc->inbuf);
 262                 rpc->inbuf  = buf;
 263                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 264         }
 265
 266         size = available;
 267         if (size > rpc->insize - rpc->inpos) {
 268                 size = rpc->insize - rpc->inpos;
 269         }
 270
 271         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 272         if (count == -1) {
 273                 if (errno == EINTR) {
 274                         return 0;
 275                 }
 276                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 277                 return -1;
 278         }
 279         available  -= count;
 280         rpc->inpos += count;
 281
 282         if (rpc->inpos == rpc->insize) {
 283                 char *buf = rpc->inbuf;
 284
 285                 rpc->inbuf  = NULL;
 286                 rpc->insize = 0;
 287                 rpc->inpos  = 0;
 288
 289                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 290                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 291                         return -1;
 292                 }
 293                 free(buf);
 294         }
 295
 296         return 0;
 297 }
 298
 299
 300
 301 int rpc_service(struct rpc_context *rpc, int revents)
 302 {
 303         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 304
 305         if (revents & POLLERR) {
 306 #ifdef WIN32
 307                 char err = 0;
 308 #else
 309                 int err = 0;
 310 #endif
 311                 socklen_t err_size = sizeof(err);
 312
 313                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 314                                 (char *)&err, &err_size) != 0 || err != 0) {
 315                         if (err == 0) {
 316                                 err = errno;
 317                         }
 318                         rpc_set_error(rpc, "rpc_service: socket error "
 319                                                "%s(%d).",
 320                                                strerror(err), err);
 321                 } else {
 322                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 323                                                 "Unknown socket error.");
 324                 }
 325                 if (rpc->connect_cb != NULL) {
 326                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 327                 }
 328                 return -1;
 329         }
 330         if (revents & POLLHUP) {
 331                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 332                 if (rpc->connect_cb != NULL) {
 333                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 334                 }
 335                 return -1;
 336         }
 337
 338         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 339                 int err = 0;
 340                 socklen_t err_size = sizeof(err);
 341
 342                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 343                                 (char *)&err, &err_size) != 0 || err != 0) {
 344                         if (err == 0) {
 345                                 err = errno;
 346                         }
 347                         rpc_set_error(rpc, "rpc_service: socket error "
 348                                         "%s(%d) while connecting.",
 349                                         strerror(err), err);
 350                         if (rpc->connect_cb != NULL) {
 351                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 352                                         NULL, rpc->connect_data);
 353                         }
 354                         return -1;
 355                 }
 356
 357                 rpc->is_connected = 1;
 358                 if (rpc->connect_cb != NULL) {
 359                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 360                 }
 361                 return 0;
 362         }
 363
 364         if (revents & POLLIN) {
 365                 if (rpc_read_from_socket(rpc) != 0) {
 366                         rpc_reconnect_requeue(rpc);
 367                         return 0;
 368                 }
 369         }
 370
 371         if (revents & POLLOUT && rpc->outqueue != NULL) {
 372                 if (rpc_write_to_socket(rpc) != 0) {
 373                         rpc_set_error(rpc, "write to socket failed");
 374                         return -1;
 375                 }
 376         }
 377
 378         return 0;
 379 }
 380
 381 void rpc_set_autoreconnect(struct rpc_context *rpc)
 382 {
 383         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 384
 385         rpc->auto_reconnect = 1;
 386 }
 387
 388 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 389 {
 390         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 391
 392         rpc->auto_reconnect = 0;
 393 }
 394
 395 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 396 {
 397         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 398
 399         rpc->tcp_syncnt = v;
 400 }
 401
 402 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 403 {
 404         int socksize;
 405
 406         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 407
 408         switch (s->ss_family) {
 409         case AF_INET:
 410                 socksize = sizeof(struct sockaddr_in);
 411                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 412 #ifdef HAVE_NETINET_TCP_H
 413                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 414                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 415                 }
 416 #endif
 417                 break;
 418         default:
 419                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 420                 return -1;
 421         }
 422
 423         if (rpc->fd == -1) {
 424                 rpc_set_error(rpc, "Failed to open socket");
 425                 return -1;
 426         }
 427
 428         /* Some systems allow you to set capabilities on an executable
 429          * to allow the file to be executed with privilege to bind to
 430          * privileged system ports, even if the user is not root.
 431          *
 432          * Opportunistically try to bind the socket to a low numbered
 433          * system port in the hope that the user is either root or the
 434          * executable has the CAP_NET_BIND_SERVICE.
 435          *
 436          * As soon as we fail the bind() with EACCES we know we will never
 437          * be able to bind to a system port so we terminate the loop.
 438          *
 439          * On linux, use
 440          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 441          * to make the executable able to bind to a system port.
 442          *
 443          * On Windows, there is no concept of privileged ports. Thus
 444          * binding will usually succeed.
 445          */
 446         {
 447                 struct sockaddr_in sin;
 448                 static int portOfs = 0;
 449                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 450                 const int portCount = IPPORT_RESERVED - firstPort;
 451                 int startOfs, port, rc;
 452
 453                 if (portOfs == 0) {
 454                         portOfs = time(NULL) % 400;
 455                 }
 456                 startOfs = portOfs;
 457                 do {
 458                         rc = -1;
 459                         port = htons(firstPort + portOfs);
 460                         portOfs = (portOfs + 1) % portCount;
 461
 462                         /* skip well-known ports */
 463                         if (!getservbyport(port, "tcp")) {
 464                                 memset(&sin, 0, sizeof(sin));
 465                                 sin.sin_port        = port;
 466                                 sin.sin_family      = AF_INET;
 467                                 sin.sin_addr.s_addr = 0;
 468
 469                                 rc = bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in));
 470 #if !defined(WIN32)
 471                                 /* we got EACCES, so don't try again */
 472                                 if (rc != 0 && errno == EACCES)
 473                                         break;
 474 #endif
 475                         }
 476                 } while (rc != 0 && portOfs != startOfs);
 477         }
 478
 479         set_nonblocking(rpc->fd);
 480
 481         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 482                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 483                 return -1;
 484         }
 485
 486         return 0;
 487 }
 488
 489 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 490 {
 491         struct sockaddr_in *sin = (struct sockaddr_in *)&rpc->s;
 492
 493         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 494
 495         if (rpc->fd != -1) {
 496                 rpc_set_error(rpc, "Trying to connect while already connected");
 497                 return -1;
 498         }
 499
 500         if (rpc->is_udp != 0) {
 501                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 502                 return -1;
 503         }
 504
 505         rpc->auto_reconnect = 0;
 506
 507         sin->sin_family = AF_INET;
 508         sin->sin_port   = htons(port);
 509         if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
 510                 rpc_set_error(rpc, "Not a valid server ip address");
 511                 return -1;
 512         }
 513
 514
 515         switch (rpc->s.ss_family) {
 516         case AF_INET:
 517 #ifdef HAVE_SOCKADDR_LEN
 518                 sin->sin_len = sizeof(struct sockaddr_in);
 519 #endif
 520                 break;
 521         }
 522
 523         rpc->connect_cb  = cb;
 524         rpc->connect_data = private_data;
 525
 526         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 527                 return -1;
 528         }
 529
 530         return 0;
 531 }
 532
 533 int rpc_disconnect(struct rpc_context *rpc, char *error)
 534 {
 535         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 536
 537         rpc_unset_autoreconnect(rpc);
 538
 539         if (rpc->fd != -1) {
 540                 close(rpc->fd);
 541         }
 542         rpc->fd  = -1;
 543
 544         rpc->is_connected = 0;
 545
 546         rpc_error_all_pdus(rpc, error);
 547
 548         return 0;
 549 }
 550
 551 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 552 {
 553         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 554
 555         if (status != RPC_STATUS_SUCCESS) {
 556                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 557                 return;
 558         }
 559
 560         rpc->is_connected = 1;
 561         rpc->connect_cb   = NULL;
 562 }
 563
 564 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 565 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 566 {
 567         struct rpc_pdu *pdu;
 568
 569         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 570
 571         if (rpc->fd != -1) {
 572                 close(rpc->fd);
 573         }
 574         rpc->fd  = -1;
 575
 576         rpc->is_connected = 0;
 577
 578         /* socket is closed so we will not get any replies to any commands
 579          * in flight. Move them all over from the waitpdu queue back to the out queue
 580          */
 581         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 582                 SLIST_REMOVE(&rpc->waitpdu, pdu);
 583                 SLIST_ADD(&rpc->outqueue, pdu);
 584                 /* we have to re-send the whole pdu again */
 585                 pdu->written = 0;
 586         }
 587
 588         if (rpc->auto_reconnect != 0) {
 589                 rpc->connect_cb  = reconnect_cb;
 590
 591                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 592                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 593                         return -1;
 594                 }
 595         }
 596
 597         return 0;
 598 }
 599
 600
 601 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 602 {
 603         struct addrinfo *ai = NULL;
 604         char service[6];
 605
 606         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 607
 608         if (rpc->is_udp == 0) {
 609                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 610                 return -1;
 611         }
 612
 613         sprintf(service, "%d", port);
 614         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 615                 rpc_set_error(rpc, "Invalid address:%s. "
 616                         "Can not resolv into IPv4/v6 structure.");
 617                 return -1;
 618         }
 619
 620         switch(ai->ai_family) {
 621         case AF_INET:
 622                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 623                 if (rpc->fd == -1) {
 624                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 625                         freeaddrinfo(ai);
 626                         return -1;
 627                 }
 628
 629                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 630                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 631                         freeaddrinfo(ai);
 632                         return -1;
 633                 }
 634                 break;
 635         default:
 636                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 637                 freeaddrinfo(ai);
 638                 return -1;
 639         }
 640
 641         freeaddrinfo(ai);
 642
 643         return 0;
 644 }
 645
 646 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 647 {
 648         struct addrinfo *ai = NULL;
 649         char service[6];
 650
 651         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 652
 653         if (rpc->is_udp == 0) {
 654                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 655                 return -1;
 656         }
 657
 658         sprintf(service, "%d", port);
 659         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 660                 rpc_set_error(rpc, "Invalid address:%s. "
 661                         "Can not resolv into IPv4/v6 structure.");
 662                 return -1;
 663         }
 664
 665         if (rpc->udp_dest) {
 666                 free(rpc->udp_dest);
 667                 rpc->udp_dest = NULL;
 668         }
 669         rpc->udp_dest = malloc(ai->ai_addrlen);
 670         if (rpc->udp_dest == NULL) {
 671                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 672                 freeaddrinfo(ai);
 673                 return -1;
 674         }
 675         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 676         freeaddrinfo(ai);
 677
 678         rpc->is_broadcast = is_broadcast;
 679         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 680
 681         return 0;
 682 }
 683
 684 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 685 {
 686         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 687
 688         return (struct sockaddr *)&rpc->udp_src;
 689 }
 690
 691 int rpc_queue_length(struct rpc_context *rpc)
 692 {
 693         int i=0;
 694         struct rpc_pdu *pdu;
 695
 696         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 697
 698         for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
 699                 i++;
 700         }
 701         for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
 702                 i++;
 703         }
 704         return i;
 705 }