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 static int rpc_reconnect_requeue(struct rpc_context *rpc);
  84 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s);
  85
  86 static void set_nonblocking(int fd)
  87 {
  88         int v = 0;
  89 #if defined(WIN32)
  90         long nonblocking=1;
  91         v = ioctl(fd, FIONBIO, &nonblocking);
  92 #else
  93         v = fcntl(fd, F_GETFL, 0);
  94         fcntl(fd, F_SETFL, v | O_NONBLOCK);
  95 #endif //FIXME
  96 }
  97
  98 static void set_nolinger(int fd)
  99 {
 100         struct linger lng;
 101         lng.l_onoff = 1;
 102         lng.l_linger = 0;
 103         setsockopt(fd, SOL_SOCKET, SO_LINGER, &lng, sizeof(lng));
 104 }
 105
 106 #ifdef HAVE_NETINET_TCP_H
 107 int set_tcp_sockopt(int sockfd, int optname, int value)
 108 {
 109         int level;
 110
 111         #if defined(__FreeBSD__) || defined(__sun) || (defined(__APPLE__) && defined(__MACH__))
 112         struct protoent *buf;
 113
 114         if ((buf = getprotobyname("tcp")) != NULL)
 115                 level = buf->p_proto;
 116         else
 117                 return -1;
 118         #else
 119                 level = SOL_TCP;
 120         #endif
 121
 122         return setsockopt(sockfd, level, optname, (char *)&value, sizeof(value));
 123 }
 124 #endif
 125
 126 int rpc_get_fd(struct rpc_context *rpc)
 127 {
 128         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 129
 130         return rpc->fd;
 131 }
 132
 133 int rpc_which_events(struct rpc_context *rpc)
 134 {
 135         int events;
 136
 137         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 138
 139         events = rpc->is_connected ? POLLIN : POLLOUT;
 140
 141         if (rpc->is_udp != 0) {
 142                 /* for udp sockets we only wait for pollin */
 143                 return POLLIN;
 144         }
 145
 146         if (rpc->outqueue) {
 147                 events |= POLLOUT;
 148         }
 149         return events;
 150 }
 151
 152 static int rpc_write_to_socket(struct rpc_context *rpc)
 153 {
 154         int32_t count;
 155
 156         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 157
 158         if (rpc->fd == -1) {
 159                 rpc_set_error(rpc, "trying to write but not connected");
 160                 return -1;
 161         }
 162
 163         while (rpc->outqueue != NULL) {
 164                 int64_t total;
 165
 166                 total = rpc->outqueue->outdata.size;
 167
 168                 count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
 169                 if (count == -1) {
 170                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 171                                 return 0;
 172                         }
 173                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 174                         return -1;
 175                 }
 176
 177                 rpc->outqueue->written += count;
 178                 if (rpc->outqueue->written == total) {
 179                         struct rpc_pdu *pdu = rpc->outqueue;
 180
 181                         SLIST_REMOVE(&rpc->outqueue, pdu);
 182                         SLIST_ADD_END(&rpc->waitpdu, pdu);
 183                 }
 184         }
 185         return 0;
 186 }
 187
 188 static int rpc_read_from_socket(struct rpc_context *rpc)
 189 {
 190         int available;
 191         int size;
 192         int pdu_size;
 193         int32_t count;
 194
 195         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 196
 197         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 198                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 199                 return -1;
 200         }
 201
 202         if (available == 0) {
 203                 rpc_set_error(rpc, "Socket has been closed");
 204                 return -1;
 205         }
 206
 207         if (rpc->is_udp) {
 208                 char *buf;
 209                 socklen_t socklen = sizeof(rpc->udp_src);
 210
 211                 buf = malloc(available);
 212                 if (buf == NULL) {
 213                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 214                         return -1;
 215                 }
 216                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 217                 if (count < 0) {
 218                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 219                         free(buf);
 220                         return -1;
 221                 }
 222                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 223                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 224                         free(buf);
 225                         return -1;
 226                 }
 227                 free(buf);
 228                 return 0;
 229         }
 230
 231         /* read record marker, 4 bytes at the beginning of every pdu */
 232         if (rpc->inbuf == NULL) {
 233                 rpc->insize = 4;
 234                 rpc->inbuf = malloc(rpc->insize);
 235                 if (rpc->inbuf == NULL) {
 236                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 237                         return -1;
 238                 }
 239         }
 240         if (rpc->inpos < 4) {
 241                 size = 4 - rpc->inpos;
 242
 243                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 244                 if (count == -1) {
 245                         if (errno == EINTR) {
 246                                 return 0;
 247                         }
 248                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 249                         return -1;
 250                 }
 251                 available  -= count;
 252                 rpc->inpos += count;
 253         }
 254
 255         if (available == 0) {
 256                 return 0;
 257         }
 258
 259         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 260         if (rpc->insize < pdu_size) {
 261                 unsigned char *buf;
 262
 263                 buf = malloc(pdu_size);
 264                 if (buf == NULL) {
 265                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 266                         return -1;
 267                 }
 268                 memcpy(buf, rpc->inbuf, rpc->insize);
 269                 free(rpc->inbuf);
 270                 rpc->inbuf  = buf;
 271                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 272         }
 273
 274         size = available;
 275         if (size > rpc->insize - rpc->inpos) {
 276                 size = rpc->insize - rpc->inpos;
 277         }
 278
 279         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 280         if (count == -1) {
 281                 if (errno == EINTR) {
 282                         return 0;
 283                 }
 284                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 285                 return -1;
 286         }
 287         available  -= count;
 288         rpc->inpos += count;
 289
 290         if (rpc->inpos == rpc->insize) {
 291                 char *buf = rpc->inbuf;
 292
 293                 rpc->inbuf  = NULL;
 294                 rpc->insize = 0;
 295                 rpc->inpos  = 0;
 296
 297                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 298                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 299                         return -1;
 300                 }
 301                 free(buf);
 302         }
 303
 304         return 0;
 305 }
 306
 307
 308
 309 int rpc_service(struct rpc_context *rpc, int revents)
 310 {
 311         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 312
 313         if (revents & POLLERR) {
 314 #ifdef WIN32
 315                 char err = 0;
 316 #else
 317                 int err = 0;
 318 #endif
 319                 socklen_t err_size = sizeof(err);
 320
 321                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 322                                 (char *)&err, &err_size) != 0 || err != 0) {
 323                         if (err == 0) {
 324                                 err = errno;
 325                         }
 326                         rpc_set_error(rpc, "rpc_service: socket error "
 327                                                "%s(%d).",
 328                                                strerror(err), err);
 329                 } else {
 330                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 331                                                 "Unknown socket error.");
 332                 }
 333                 if (rpc->connect_cb != NULL) {
 334                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 335                 }
 336                 return -1;
 337         }
 338         if (revents & POLLHUP) {
 339                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 340                 if (rpc->connect_cb != NULL) {
 341                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 342                 }
 343                 return -1;
 344         }
 345
 346         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 347                 int err = 0;
 348                 socklen_t err_size = sizeof(err);
 349
 350                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 351                                 (char *)&err, &err_size) != 0 || err != 0) {
 352                         if (err == 0) {
 353                                 err = errno;
 354                         }
 355                         rpc_set_error(rpc, "rpc_service: socket error "
 356                                         "%s(%d) while connecting.",
 357                                         strerror(err), err);
 358                         if (rpc->connect_cb != NULL) {
 359                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 360                                         NULL, rpc->connect_data);
 361                         }
 362                         return -1;
 363                 }
 364
 365                 rpc->is_connected = 1;
 366                 if (rpc->connect_cb != NULL) {
 367                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 368                 }
 369                 return 0;
 370         }
 371
 372         if (revents & POLLIN) {
 373                 if (rpc_read_from_socket(rpc) != 0) {
 374                         rpc_reconnect_requeue(rpc);
 375                         return 0;
 376                 }
 377         }
 378
 379         if (revents & POLLOUT && rpc->outqueue != NULL) {
 380                 if (rpc_write_to_socket(rpc) != 0) {
 381                         rpc_set_error(rpc, "write to socket failed");
 382                         return -1;
 383                 }
 384         }
 385
 386         return 0;
 387 }
 388
 389 void rpc_set_autoreconnect(struct rpc_context *rpc)
 390 {
 391         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 392
 393         rpc->auto_reconnect = 1;
 394 }
 395
 396 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 397 {
 398         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 399
 400         rpc->auto_reconnect = 0;
 401 }
 402
 403 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 404 {
 405         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 406
 407         rpc->tcp_syncnt = v;
 408 }
 409
 410 #ifndef TCP_SYNCNT
 411 #define TCP_SYNCNT        7
 412 #endif
 413
 414 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 415 {
 416         int socksize;
 417
 418         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 419
 420         switch (s->ss_family) {
 421         case AF_INET:
 422                 socksize = sizeof(struct sockaddr_in);
 423                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 424 #ifdef HAVE_NETINET_TCP_H
 425                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 426                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 427                 }
 428 #endif
 429                 break;
 430         case AF_INET6:
 431                 socksize = sizeof(struct sockaddr_in6);
 432                 rpc->fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 433 #ifdef HAVE_NETINET_TCP_H
 434                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 435                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 436                 }
 437 #endif
 438                 break;
 439         default:
 440                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 441                 return -1;
 442         }
 443
 444         if (rpc->fd == -1) {
 445                 rpc_set_error(rpc, "Failed to open socket");
 446                 return -1;
 447         }
 448
 449         /* Some systems allow you to set capabilities on an executable
 450          * to allow the file to be executed with privilege to bind to
 451          * privileged system ports, even if the user is not root.
 452          *
 453          * Opportunistically try to bind the socket to a low numbered
 454          * system port in the hope that the user is either root or the
 455          * executable has the CAP_NET_BIND_SERVICE.
 456          *
 457          * As soon as we fail the bind() with EACCES we know we will never
 458          * be able to bind to a system port so we terminate the loop.
 459          *
 460          * On linux, use
 461          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 462          * to make the executable able to bind to a system port.
 463          *
 464          * On Windows, there is no concept of privileged ports. Thus
 465          * binding will usually succeed.
 466          */
 467         {
 468                 struct sockaddr_storage ss;
 469                 static int portOfs = 0;
 470                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 471                 const int portCount = IPPORT_RESERVED - firstPort;
 472                 int startOfs, port, rc;
 473
 474                 if (portOfs == 0) {
 475                         portOfs = time(NULL) % 400;
 476                 }
 477                 startOfs = portOfs;
 478                 do {
 479                         rc = -1;
 480                         port = htons(firstPort + portOfs);
 481                         portOfs = (portOfs + 1) % portCount;
 482
 483                         /* skip well-known ports */
 484                         if (!getservbyport(port, "tcp")) {
 485                                 memset(&ss, 0, sizeof(ss));
 486
 487                                 switch (s->ss_family) {
 488                                 case AF_INET:
 489                                         ((struct sockaddr_in *)&ss)->sin_port = port;
 490                                         ((struct sockaddr_in *)&ss)->sin_family      = AF_INET;
 491 #ifdef HAVE_SOCKADDR_LEN
 492                                         ((struct sockaddr_in *)&ss)->sin_len = sizeof(struct sockaddr_in);
 493 #endif
 494                                         break;
 495                                 case AF_INET6:
 496                                         ((struct sockaddr_in6 *)&ss)->sin6_port = port;
 497                                         ((struct sockaddr_in6 *)&ss)->sin6_family      = AF_INET6;
 498 #ifdef HAVE_SOCKADDR_LEN
 499                                         ((struct sockaddr_in6 *)&ss)->sin6_len = sizeof(struct sockaddr_in);
 500 #endif
 501                                         break;
 502                                 }
 503
 504                                 rc = bind(rpc->fd, (struct sockaddr *)&ss, socksize);
 505 #if !defined(WIN32)
 506                                 /* we got EACCES, so don't try again */
 507                                 if (rc != 0 && errno == EACCES)
 508                                         break;
 509 #endif
 510                         }
 511                 } while (rc != 0 && portOfs != startOfs);
 512         }
 513
 514         set_nonblocking(rpc->fd);
 515         set_nolinger(rpc->fd);
 516
 517         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 518                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 519                 return -1;
 520         }
 521
 522         return 0;
 523 }
 524
 525 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 526 {
 527         struct addrinfo *ai = NULL;
 528
 529         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 530
 531         if (rpc->fd != -1) {
 532                 rpc_set_error(rpc, "Trying to connect while already connected");
 533                 return -1;
 534         }
 535
 536         if (rpc->is_udp != 0) {
 537                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 538                 return -1;
 539         }
 540
 541         rpc->auto_reconnect = 0;
 542
 543         if (getaddrinfo(server, NULL, NULL, &ai) != 0) {
 544                 rpc_set_error(rpc, "Invalid address:%s. "
 545                               "Can not resolv into IPv4/v6 structure.", server);
 546                 return -1;
 547         }
 548
 549         switch (ai->ai_family) {
 550         case AF_INET:
 551                 ((struct sockaddr_in *)&rpc->s)->sin_family = ai->ai_family;
 552                 ((struct sockaddr_in *)&rpc->s)->sin_port   = htons(port);
 553 #ifdef HAVE_SOCKADDR_LEN
 554                 ((struct sockaddr_in *)&rpc->s)->sin_len = sizeof(struct sockaddr_in);
 555 #endif
 556                 break;
 557         case AF_INET6:
 558                 ((struct sockaddr_in6 *)&rpc->s)->sin6_family = ai->ai_family;
 559                 ((struct sockaddr_in6 *)&rpc->s)->sin6_port   = htons(port);
 560 #ifdef HAVE_SOCKADDR_LEN
 561                 ((struct sockaddr_in6 *)&rpc->s)->sin6_len = sizeof(struct sockaddr_in6);
 562 #endif
 563                 break;
 564         }
 565
 566         rpc->connect_cb  = cb;
 567         rpc->connect_data = private_data;
 568
 569         freeaddrinfo(ai);
 570
 571         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 572                 return -1;
 573         }
 574
 575         return 0;
 576 }
 577
 578 int rpc_disconnect(struct rpc_context *rpc, char *error)
 579 {
 580         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 581
 582         rpc_unset_autoreconnect(rpc);
 583
 584         if (rpc->fd != -1) {
 585                 close(rpc->fd);
 586         }
 587         rpc->fd  = -1;
 588
 589         rpc->is_connected = 0;
 590
 591         rpc_error_all_pdus(rpc, error);
 592
 593         return 0;
 594 }
 595
 596 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 597 {
 598         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 599
 600         if (status != RPC_STATUS_SUCCESS) {
 601                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 602                 return;
 603         }
 604
 605         rpc->is_connected = 1;
 606         rpc->connect_cb   = NULL;
 607 }
 608
 609 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 610 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 611 {
 612         struct rpc_pdu *pdu;
 613
 614         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 615
 616         if (rpc->fd != -1) {
 617                 close(rpc->fd);
 618         }
 619         rpc->fd  = -1;
 620
 621         rpc->is_connected = 0;
 622
 623         /* socket is closed so we will not get any replies to any commands
 624          * in flight. Move them all over from the waitpdu queue back to the out queue
 625          */
 626         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 627                 SLIST_REMOVE(&rpc->waitpdu, pdu);
 628                 SLIST_ADD(&rpc->outqueue, pdu);
 629                 /* we have to re-send the whole pdu again */
 630                 pdu->written = 0;
 631         }
 632
 633         if (rpc->auto_reconnect != 0) {
 634                 rpc->connect_cb  = reconnect_cb;
 635
 636                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 637                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 638                         return -1;
 639                 }
 640         }
 641
 642         return 0;
 643 }
 644
 645
 646 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 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, "Cant not bind UDP. 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.", addr);
 662                 return -1;
 663         }
 664
 665         switch(ai->ai_family) {
 666         case AF_INET:
 667                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 668                 if (rpc->fd == -1) {
 669                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 670                         freeaddrinfo(ai);
 671                         return -1;
 672                 }
 673
 674                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 675                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 676                         freeaddrinfo(ai);
 677                         return -1;
 678                 }
 679                 break;
 680         default:
 681                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 682                 freeaddrinfo(ai);
 683                 return -1;
 684         }
 685
 686         freeaddrinfo(ai);
 687
 688         return 0;
 689 }
 690
 691 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 692 {
 693         struct addrinfo *ai = NULL;
 694         char service[6];
 695
 696         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 697
 698         if (rpc->is_udp == 0) {
 699                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 700                 return -1;
 701         }
 702
 703         sprintf(service, "%d", port);
 704         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 705                 rpc_set_error(rpc, "Invalid address:%s. "
 706                               "Can not resolv into IPv4/v6 structure.", addr);
 707                 return -1;
 708         }
 709
 710         if (rpc->udp_dest) {
 711                 free(rpc->udp_dest);
 712                 rpc->udp_dest = NULL;
 713         }
 714         rpc->udp_dest = malloc(ai->ai_addrlen);
 715         if (rpc->udp_dest == NULL) {
 716                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 717                 freeaddrinfo(ai);
 718                 return -1;
 719         }
 720         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 721         freeaddrinfo(ai);
 722
 723         rpc->is_broadcast = is_broadcast;
 724         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 725
 726         return 0;
 727 }
 728
 729 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 730 {
 731         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 732
 733         return (struct sockaddr *)&rpc->udp_src;
 734 }
 735
 736 int rpc_queue_length(struct rpc_context *rpc)
 737 {
 738         int i=0;
 739         struct rpc_pdu *pdu;
 740
 741         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 742
 743         for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
 744                 i++;
 745         }
 746         for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
 747                 i++;
 748         }
 749         return i;
 750 }
 751
 752 void rpc_set_fd(struct rpc_context *rpc, int fd)
 753 {
 754         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 755
 756         rpc->fd = fd;
 757 }