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 #ifdef HAVE_NETINET_TCP_H
  99 int set_tcp_sockopt(int sockfd, int optname, int value)
 100 {
 101         int level;
 102
 103         #if defined(__FreeBSD__) || defined(__sun) || (defined(__APPLE__) && defined(__MACH__))
 104         struct protoent *buf;
 105
 106         if ((buf = getprotobyname("tcp")) != NULL)
 107                 level = buf->p_proto;
 108         else
 109                 return -1;
 110         #else
 111                 level = SOL_TCP;
 112         #endif
 113
 114         return setsockopt(sockfd, level, optname, (char *)&value, sizeof(value));
 115 }
 116 #endif
 117
 118 int rpc_get_fd(struct rpc_context *rpc)
 119 {
 120         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 121
 122         return rpc->fd;
 123 }
 124
 125 static int rpc_has_queue(struct rpc_queue *q)
 126 {
 127         return q->head != NULL;
 128 }
 129
 130 int rpc_which_events(struct rpc_context *rpc)
 131 {
 132         int events;
 133
 134         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 135
 136         events = rpc->is_connected ? POLLIN : POLLOUT;
 137
 138         if (rpc->is_udp != 0) {
 139                 /* for udp sockets we only wait for pollin */
 140                 return POLLIN;
 141         }
 142
 143         if (rpc_has_queue(&rpc->outqueue)) {
 144                 events |= POLLOUT;
 145         }
 146         return events;
 147 }
 148
 149 static int rpc_write_to_socket(struct rpc_context *rpc)
 150 {
 151         int32_t count;
 152         struct rpc_pdu *pdu;
 153
 154         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 155
 156         if (rpc->fd == -1) {
 157                 rpc_set_error(rpc, "trying to write but not connected");
 158                 return -1;
 159         }
 160
 161         while ((pdu = rpc->outqueue.head) != NULL) {
 162                 int64_t total;
 163
 164                 total = pdu->outdata.size;
 165
 166                 count = send(rpc->fd, pdu->outdata.data + pdu->written, total - pdu->written, 0);
 167                 if (count == -1) {
 168                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 169                                 return 0;
 170                         }
 171                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 172                         return -1;
 173                 }
 174
 175                 pdu->written += count;
 176                 if (pdu->written == total) {
 177                         rpc->outqueue.head = pdu->next;
 178                         if (pdu->next == NULL)
 179                                 rpc->outqueue.tail = NULL;
 180                         rpc_enqueue(&rpc->waitpdu, pdu);
 181                 }
 182         }
 183         return 0;
 184 }
 185
 186 static int rpc_read_from_socket(struct rpc_context *rpc)
 187 {
 188         int available;
 189         int size;
 190         int pdu_size;
 191         int32_t count;
 192
 193         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 194
 195         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 196                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 197                 return -1;
 198         }
 199
 200         if (available == 0) {
 201                 rpc_set_error(rpc, "Socket has been closed");
 202                 return -1;
 203         }
 204
 205         if (rpc->is_udp) {
 206                 char *buf;
 207                 socklen_t socklen = sizeof(rpc->udp_src);
 208
 209                 buf = malloc(available);
 210                 if (buf == NULL) {
 211                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 212                         return -1;
 213                 }
 214                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 215                 if (count < 0) {
 216                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 217                         free(buf);
 218                         return -1;
 219                 }
 220                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 221                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 222                         free(buf);
 223                         return -1;
 224                 }
 225                 free(buf);
 226                 return 0;
 227         }
 228
 229         /* read record marker, 4 bytes at the beginning of every pdu */
 230         if (rpc->inbuf == NULL) {
 231                 rpc->insize = 4;
 232                 rpc->inbuf = malloc(rpc->insize);
 233                 if (rpc->inbuf == NULL) {
 234                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 235                         return -1;
 236                 }
 237         }
 238         if (rpc->inpos < 4) {
 239                 size = 4 - rpc->inpos;
 240
 241                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 242                 if (count == -1) {
 243                         if (errno == EINTR) {
 244                                 return 0;
 245                         }
 246                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 247                         return -1;
 248                 }
 249                 available  -= count;
 250                 rpc->inpos += count;
 251         }
 252
 253         if (available == 0) {
 254                 return 0;
 255         }
 256
 257         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 258         if (rpc->insize < pdu_size) {
 259                 unsigned char *buf;
 260
 261                 buf = malloc(pdu_size);
 262                 if (buf == NULL) {
 263                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 264                         return -1;
 265                 }
 266                 memcpy(buf, rpc->inbuf, rpc->insize);
 267                 free(rpc->inbuf);
 268                 rpc->inbuf  = buf;
 269                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 270         }
 271
 272         size = available;
 273         if (size > rpc->insize - rpc->inpos) {
 274                 size = rpc->insize - rpc->inpos;
 275         }
 276
 277         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 278         if (count == -1) {
 279                 if (errno == EINTR) {
 280                         return 0;
 281                 }
 282                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 283                 return -1;
 284         }
 285         available  -= count;
 286         rpc->inpos += count;
 287
 288         if (rpc->inpos == rpc->insize) {
 289                 char *buf = rpc->inbuf;
 290
 291                 rpc->inbuf  = NULL;
 292                 rpc->insize = 0;
 293                 rpc->inpos  = 0;
 294
 295                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 296                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 297                         return -1;
 298                 }
 299                 free(buf);
 300         }
 301
 302         return 0;
 303 }
 304
 305
 306
 307 int rpc_service(struct rpc_context *rpc, int revents)
 308 {
 309         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 310
 311         if (revents & POLLERR) {
 312 #ifdef WIN32
 313                 char err = 0;
 314 #else
 315                 int err = 0;
 316 #endif
 317                 socklen_t err_size = sizeof(err);
 318
 319                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 320                                 (char *)&err, &err_size) != 0 || err != 0) {
 321                         if (err == 0) {
 322                                 err = errno;
 323                         }
 324                         rpc_set_error(rpc, "rpc_service: socket error "
 325                                                "%s(%d).",
 326                                                strerror(err), err);
 327                 } else {
 328                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 329                                                 "Unknown socket error.");
 330                 }
 331                 if (rpc->connect_cb != NULL) {
 332                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 333                 }
 334                 return -1;
 335         }
 336         if (revents & POLLHUP) {
 337                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 338                 if (rpc->connect_cb != NULL) {
 339                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 340                 }
 341                 return -1;
 342         }
 343
 344         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 345                 int err = 0;
 346                 socklen_t err_size = sizeof(err);
 347
 348                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 349                                 (char *)&err, &err_size) != 0 || err != 0) {
 350                         if (err == 0) {
 351                                 err = errno;
 352                         }
 353                         rpc_set_error(rpc, "rpc_service: socket error "
 354                                         "%s(%d) while connecting.",
 355                                         strerror(err), err);
 356                         if (rpc->connect_cb != NULL) {
 357                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 358                                         NULL, rpc->connect_data);
 359                         }
 360                         return -1;
 361                 }
 362
 363                 rpc->is_connected = 1;
 364                 if (rpc->connect_cb != NULL) {
 365                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 366                 }
 367                 return 0;
 368         }
 369
 370         if (revents & POLLIN) {
 371                 if (rpc_read_from_socket(rpc) != 0) {
 372                         rpc_reconnect_requeue(rpc);
 373                         return 0;
 374                 }
 375         }
 376
 377         if (revents & POLLOUT && rpc_has_queue(&rpc->outqueue)) {
 378                 if (rpc_write_to_socket(rpc) != 0) {
 379                         rpc_set_error(rpc, "write to socket failed");
 380                         return -1;
 381                 }
 382         }
 383
 384         return 0;
 385 }
 386
 387 void rpc_set_autoreconnect(struct rpc_context *rpc)
 388 {
 389         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 390
 391         rpc->auto_reconnect = 1;
 392 }
 393
 394 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 395 {
 396         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 397
 398         rpc->auto_reconnect = 0;
 399 }
 400
 401 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 402 {
 403         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 404
 405         rpc->tcp_syncnt = v;
 406 }
 407
 408 #ifndef TCP_SYNCNT
 409 #define TCP_SYNCNT        7
 410 #endif
 411
 412 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 413 {
 414         int socksize;
 415
 416         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 417
 418         switch (s->ss_family) {
 419         case AF_INET:
 420                 socksize = sizeof(struct sockaddr_in);
 421                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 422 #ifdef HAVE_NETINET_TCP_H
 423                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 424                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 425                 }
 426 #endif
 427                 break;
 428         case AF_INET6:
 429                 socksize = sizeof(struct sockaddr_in6);
 430                 rpc->fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 431 #ifdef HAVE_NETINET_TCP_H
 432                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 433                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 434                 }
 435 #endif
 436                 break;
 437         default:
 438                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 439                 return -1;
 440         }
 441
 442         if (rpc->fd == -1) {
 443                 rpc_set_error(rpc, "Failed to open socket");
 444                 return -1;
 445         }
 446
 447         /* Some systems allow you to set capabilities on an executable
 448          * to allow the file to be executed with privilege to bind to
 449          * privileged system ports, even if the user is not root.
 450          *
 451          * Opportunistically try to bind the socket to a low numbered
 452          * system port in the hope that the user is either root or the
 453          * executable has the CAP_NET_BIND_SERVICE.
 454          *
 455          * As soon as we fail the bind() with EACCES we know we will never
 456          * be able to bind to a system port so we terminate the loop.
 457          *
 458          * On linux, use
 459          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 460          * to make the executable able to bind to a system port.
 461          *
 462          * On Windows, there is no concept of privileged ports. Thus
 463          * binding will usually succeed.
 464          */
 465         {
 466                 struct sockaddr_storage ss;
 467                 static int portOfs = 0;
 468                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 469                 const int portCount = IPPORT_RESERVED - firstPort;
 470                 int startOfs, port, rc;
 471
 472                 if (portOfs == 0) {
 473                         portOfs = time(NULL) % 400;
 474                 }
 475                 startOfs = portOfs;
 476                 do {
 477                         rc = -1;
 478                         port = htons(firstPort + portOfs);
 479                         portOfs = (portOfs + 1) % portCount;
 480
 481                         /* skip well-known ports */
 482                         if (!getservbyport(port, "tcp")) {
 483                                 memset(&ss, 0, sizeof(ss));
 484
 485                                 switch (s->ss_family) {
 486                                 case AF_INET:
 487                                         ((struct sockaddr_in *)&ss)->sin_port = port;
 488                                         ((struct sockaddr_in *)&ss)->sin_family      = AF_INET;
 489 #ifdef HAVE_SOCKADDR_LEN
 490                                         ((struct sockaddr_in *)&ss)->sin_len = sizeof(struct sockaddr_in);
 491 #endif
 492                                         break;
 493                                 case AF_INET6:
 494                                         ((struct sockaddr_in6 *)&ss)->sin6_port = port;
 495                                         ((struct sockaddr_in6 *)&ss)->sin6_family      = AF_INET6;
 496 #ifdef HAVE_SOCKADDR_LEN
 497                                         ((struct sockaddr_in6 *)&ss)->sin6_len = sizeof(struct sockaddr_in);
 498 #endif
 499                                         break;
 500                                 }
 501
 502                                 rc = bind(rpc->fd, (struct sockaddr *)&ss, socksize);
 503 #if !defined(WIN32)
 504                                 /* we got EACCES, so don't try again */
 505                                 if (rc != 0 && errno == EACCES)
 506                                         break;
 507 #endif
 508                         }
 509                 } while (rc != 0 && portOfs != startOfs);
 510         }
 511
 512         set_nonblocking(rpc->fd);
 513
 514         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 515                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 516                 return -1;
 517         }
 518
 519         return 0;
 520 }
 521
 522 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 523 {
 524         struct addrinfo *ai = NULL;
 525
 526         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 527
 528         if (rpc->fd != -1) {
 529                 rpc_set_error(rpc, "Trying to connect while already connected");
 530                 return -1;
 531         }
 532
 533         if (rpc->is_udp != 0) {
 534                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 535                 return -1;
 536         }
 537
 538         rpc->auto_reconnect = 0;
 539
 540         if (getaddrinfo(server, NULL, NULL, &ai) != 0) {
 541                 rpc_set_error(rpc, "Invalid address:%s. "
 542                               "Can not resolv into IPv4/v6 structure.", server);
 543                 return -1;
 544         }
 545
 546         switch (ai->ai_family) {
 547         case AF_INET:
 548                 ((struct sockaddr_in *)&rpc->s)->sin_family = ai->ai_family;
 549                 ((struct sockaddr_in *)&rpc->s)->sin_port   = htons(port);
 550 #ifdef HAVE_SOCKADDR_LEN
 551                 ((struct sockaddr_in *)&rpc->s)->sin_len = sizeof(struct sockaddr_in);
 552 #endif
 553                 break;
 554         case AF_INET6:
 555                 ((struct sockaddr_in6 *)&rpc->s)->sin6_family = ai->ai_family;
 556                 ((struct sockaddr_in6 *)&rpc->s)->sin6_port   = htons(port);
 557 #ifdef HAVE_SOCKADDR_LEN
 558                 ((struct sockaddr_in6 *)&rpc->s)->sin6_len = sizeof(struct sockaddr_in6);
 559 #endif
 560                 break;
 561         }
 562
 563         rpc->connect_cb  = cb;
 564         rpc->connect_data = private_data;
 565
 566         freeaddrinfo(ai);
 567
 568         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 569                 return -1;
 570         }
 571
 572         return 0;
 573 }
 574
 575 int rpc_disconnect(struct rpc_context *rpc, char *error)
 576 {
 577         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 578
 579         rpc_unset_autoreconnect(rpc);
 580
 581         if (rpc->fd != -1) {
 582                 close(rpc->fd);
 583         }
 584         rpc->fd  = -1;
 585
 586         rpc->is_connected = 0;
 587
 588         rpc_error_all_pdus(rpc, error);
 589
 590         return 0;
 591 }
 592
 593 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 594 {
 595         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 596
 597         if (status != RPC_STATUS_SUCCESS) {
 598                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 599                 return;
 600         }
 601
 602         rpc->is_connected = 1;
 603         rpc->connect_cb   = NULL;
 604 }
 605
 606 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 607 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 608 {
 609         struct rpc_pdu *pdu;
 610
 611         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 612
 613         if (rpc->fd != -1) {
 614                 close(rpc->fd);
 615         }
 616         rpc->fd  = -1;
 617
 618         rpc->is_connected = 0;
 619
 620         /* socket is closed so we will not get any replies to any commands
 621          * in flight. Move them all over from the waitpdu queue back to the out queue
 622          */
 623         for (pdu=rpc->waitpdu.head; pdu; pdu=pdu->next) {
 624                 rpc_return_to_queue(&rpc->outqueue, pdu);
 625                 /* we have to re-send the whole pdu again */
 626                 pdu->written = 0;
 627         }
 628         rpc_reset_queue(&rpc->waitpdu);
 629
 630         if (rpc->auto_reconnect != 0) {
 631                 rpc->connect_cb  = reconnect_cb;
 632
 633                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 634                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 635                         return -1;
 636                 }
 637         }
 638
 639         return 0;
 640 }
 641
 642
 643 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 644 {
 645         struct addrinfo *ai = NULL;
 646         char service[6];
 647
 648         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 649
 650         if (rpc->is_udp == 0) {
 651                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 652                 return -1;
 653         }
 654
 655         sprintf(service, "%d", port);
 656         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 657                 rpc_set_error(rpc, "Invalid address:%s. "
 658                               "Can not resolv into IPv4/v6 structure.", addr);
 659                 return -1;
 660         }
 661
 662         switch(ai->ai_family) {
 663         case AF_INET:
 664                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 665                 if (rpc->fd == -1) {
 666                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 667                         freeaddrinfo(ai);
 668                         return -1;
 669                 }
 670
 671                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 672                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 673                         freeaddrinfo(ai);
 674                         return -1;
 675                 }
 676                 break;
 677         default:
 678                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 679                 freeaddrinfo(ai);
 680                 return -1;
 681         }
 682
 683         freeaddrinfo(ai);
 684
 685         return 0;
 686 }
 687
 688 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 689 {
 690         struct addrinfo *ai = NULL;
 691         char service[6];
 692
 693         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 694
 695         if (rpc->is_udp == 0) {
 696                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 697                 return -1;
 698         }
 699
 700         sprintf(service, "%d", port);
 701         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 702                 rpc_set_error(rpc, "Invalid address:%s. "
 703                               "Can not resolv into IPv4/v6 structure.", addr);
 704                 return -1;
 705         }
 706
 707         if (rpc->udp_dest) {
 708                 free(rpc->udp_dest);
 709                 rpc->udp_dest = NULL;
 710         }
 711         rpc->udp_dest = malloc(ai->ai_addrlen);
 712         if (rpc->udp_dest == NULL) {
 713                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 714                 freeaddrinfo(ai);
 715                 return -1;
 716         }
 717         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 718         freeaddrinfo(ai);
 719
 720         rpc->is_broadcast = is_broadcast;
 721         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 722
 723         return 0;
 724 }
 725
 726 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 727 {
 728         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 729
 730         return (struct sockaddr *)&rpc->udp_src;
 731 }
 732
 733 int rpc_queue_length(struct rpc_context *rpc)
 734 {
 735         int i=0;
 736         struct rpc_pdu *pdu;
 737
 738         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 739
 740         for(pdu = rpc->outqueue.head; pdu; pdu = pdu->next) {
 741                 i++;
 742         }
 743         for(pdu = rpc->waitpdu.head; pdu; pdu = pdu->next) {
 744                 i++;
 745         }
 746         return i;
 747 }
 748
 749 void rpc_set_fd(struct rpc_context *rpc, int fd)
 750 {
 751         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 752
 753         rpc->fd = fd;
 754 }