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                         unsigned int hash;
 178
 179                         rpc->outqueue.head = pdu->next;
 180                         if (pdu->next == NULL)
 181                                 rpc->outqueue.tail = NULL;
 182
 183                         hash = rpc_hash_xid(pdu->xid);
 184                         rpc_enqueue(&rpc->waitpdu[hash], pdu);
 185                 }
 186         }
 187         return 0;
 188 }
 189
 190 static int rpc_read_from_socket(struct rpc_context *rpc)
 191 {
 192         int available;
 193         int size;
 194         int pdu_size;
 195         int32_t count;
 196
 197         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 198
 199         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 200                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 201                 return -1;
 202         }
 203
 204         if (available == 0) {
 205                 rpc_set_error(rpc, "Socket has been closed");
 206                 return -1;
 207         }
 208
 209         if (rpc->is_udp) {
 210                 char *buf;
 211                 socklen_t socklen = sizeof(rpc->udp_src);
 212
 213                 buf = malloc(available);
 214                 if (buf == NULL) {
 215                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 216                         return -1;
 217                 }
 218                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 219                 if (count < 0) {
 220                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 221                         free(buf);
 222                         return -1;
 223                 }
 224                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 225                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 226                         free(buf);
 227                         return -1;
 228                 }
 229                 free(buf);
 230                 return 0;
 231         }
 232
 233         /* read record marker, 4 bytes at the beginning of every pdu */
 234         if (rpc->inbuf == NULL) {
 235                 rpc->insize = 4;
 236                 rpc->inbuf = malloc(rpc->insize);
 237                 if (rpc->inbuf == NULL) {
 238                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 239                         return -1;
 240                 }
 241         }
 242         if (rpc->inpos < 4) {
 243                 size = 4 - rpc->inpos;
 244
 245                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 246                 if (count == -1) {
 247                         if (errno == EINTR) {
 248                                 return 0;
 249                         }
 250                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 251                         return -1;
 252                 }
 253                 available  -= count;
 254                 rpc->inpos += count;
 255         }
 256
 257         if (available == 0) {
 258                 return 0;
 259         }
 260
 261         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 262         if (rpc->insize < pdu_size) {
 263                 unsigned char *buf;
 264
 265                 buf = malloc(pdu_size);
 266                 if (buf == NULL) {
 267                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 268                         return -1;
 269                 }
 270                 memcpy(buf, rpc->inbuf, rpc->insize);
 271                 free(rpc->inbuf);
 272                 rpc->inbuf  = buf;
 273                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 274         }
 275
 276         size = available;
 277         if (size > rpc->insize - rpc->inpos) {
 278                 size = rpc->insize - rpc->inpos;
 279         }
 280
 281         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 282         if (count == -1) {
 283                 if (errno == EINTR) {
 284                         return 0;
 285                 }
 286                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 287                 return -1;
 288         }
 289         available  -= count;
 290         rpc->inpos += count;
 291
 292         if (rpc->inpos == rpc->insize) {
 293                 char *buf = rpc->inbuf;
 294
 295                 rpc->inbuf  = NULL;
 296                 rpc->insize = 0;
 297                 rpc->inpos  = 0;
 298
 299                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 300                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 301                         return -1;
 302                 }
 303                 free(buf);
 304         }
 305
 306         return 0;
 307 }
 308
 309
 310
 311 int rpc_service(struct rpc_context *rpc, int revents)
 312 {
 313         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 314
 315         if (revents & POLLERR) {
 316 #ifdef WIN32
 317                 char err = 0;
 318 #else
 319                 int err = 0;
 320 #endif
 321                 socklen_t err_size = sizeof(err);
 322
 323                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 324                                 (char *)&err, &err_size) != 0 || err != 0) {
 325                         if (err == 0) {
 326                                 err = errno;
 327                         }
 328                         rpc_set_error(rpc, "rpc_service: socket error "
 329                                                "%s(%d).",
 330                                                strerror(err), err);
 331                 } else {
 332                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 333                                                 "Unknown socket error.");
 334                 }
 335                 if (rpc->connect_cb != NULL) {
 336                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 337                 }
 338                 return -1;
 339         }
 340         if (revents & POLLHUP) {
 341                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 342                 if (rpc->connect_cb != NULL) {
 343                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 344                 }
 345                 return -1;
 346         }
 347
 348         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 349                 int err = 0;
 350                 socklen_t err_size = sizeof(err);
 351
 352                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 353                                 (char *)&err, &err_size) != 0 || err != 0) {
 354                         if (err == 0) {
 355                                 err = errno;
 356                         }
 357                         rpc_set_error(rpc, "rpc_service: socket error "
 358                                         "%s(%d) while connecting.",
 359                                         strerror(err), err);
 360                         if (rpc->connect_cb != NULL) {
 361                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 362                                         NULL, rpc->connect_data);
 363                         }
 364                         return -1;
 365                 }
 366
 367                 rpc->is_connected = 1;
 368                 if (rpc->connect_cb != NULL) {
 369                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 370                 }
 371                 return 0;
 372         }
 373
 374         if (revents & POLLIN) {
 375                 if (rpc_read_from_socket(rpc) != 0) {
 376                         rpc_reconnect_requeue(rpc);
 377                         return 0;
 378                 }
 379         }
 380
 381         if (revents & POLLOUT && rpc_has_queue(&rpc->outqueue)) {
 382                 if (rpc_write_to_socket(rpc) != 0) {
 383                         rpc_set_error(rpc, "write to socket failed");
 384                         return -1;
 385                 }
 386         }
 387
 388         return 0;
 389 }
 390
 391 void rpc_set_autoreconnect(struct rpc_context *rpc)
 392 {
 393         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 394
 395         rpc->auto_reconnect = 1;
 396 }
 397
 398 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 399 {
 400         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 401
 402         rpc->auto_reconnect = 0;
 403 }
 404
 405 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 406 {
 407         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 408
 409         rpc->tcp_syncnt = v;
 410 }
 411
 412 #ifndef TCP_SYNCNT
 413 #define TCP_SYNCNT        7
 414 #endif
 415
 416 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 417 {
 418         int socksize;
 419
 420         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 421
 422         switch (s->ss_family) {
 423         case AF_INET:
 424                 socksize = sizeof(struct sockaddr_in);
 425                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 426 #ifdef HAVE_NETINET_TCP_H
 427                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 428                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 429                 }
 430 #endif
 431                 break;
 432         case AF_INET6:
 433                 socksize = sizeof(struct sockaddr_in6);
 434                 rpc->fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 435 #ifdef HAVE_NETINET_TCP_H
 436                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 437                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 438                 }
 439 #endif
 440                 break;
 441         default:
 442                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 443                 return -1;
 444         }
 445
 446         if (rpc->fd == -1) {
 447                 rpc_set_error(rpc, "Failed to open socket");
 448                 return -1;
 449         }
 450
 451         /* Some systems allow you to set capabilities on an executable
 452          * to allow the file to be executed with privilege to bind to
 453          * privileged system ports, even if the user is not root.
 454          *
 455          * Opportunistically try to bind the socket to a low numbered
 456          * system port in the hope that the user is either root or the
 457          * executable has the CAP_NET_BIND_SERVICE.
 458          *
 459          * As soon as we fail the bind() with EACCES we know we will never
 460          * be able to bind to a system port so we terminate the loop.
 461          *
 462          * On linux, use
 463          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 464          * to make the executable able to bind to a system port.
 465          *
 466          * On Windows, there is no concept of privileged ports. Thus
 467          * binding will usually succeed.
 468          */
 469         {
 470                 struct sockaddr_storage ss;
 471                 static int portOfs = 0;
 472                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 473                 const int portCount = IPPORT_RESERVED - firstPort;
 474                 int startOfs, port, rc;
 475
 476                 if (portOfs == 0) {
 477                         portOfs = time(NULL) % 400;
 478                 }
 479                 startOfs = portOfs;
 480                 do {
 481                         rc = -1;
 482                         port = htons(firstPort + portOfs);
 483                         portOfs = (portOfs + 1) % portCount;
 484
 485                         /* skip well-known ports */
 486                         if (!getservbyport(port, "tcp")) {
 487                                 memset(&ss, 0, sizeof(ss));
 488
 489                                 switch (s->ss_family) {
 490                                 case AF_INET:
 491                                         ((struct sockaddr_in *)&ss)->sin_port = port;
 492                                         ((struct sockaddr_in *)&ss)->sin_family      = AF_INET;
 493 #ifdef HAVE_SOCKADDR_LEN
 494                                         ((struct sockaddr_in *)&ss)->sin_len = sizeof(struct sockaddr_in);
 495 #endif
 496                                         break;
 497                                 case AF_INET6:
 498                                         ((struct sockaddr_in6 *)&ss)->sin6_port = port;
 499                                         ((struct sockaddr_in6 *)&ss)->sin6_family      = AF_INET6;
 500 #ifdef HAVE_SOCKADDR_LEN
 501                                         ((struct sockaddr_in6 *)&ss)->sin6_len = sizeof(struct sockaddr_in);
 502 #endif
 503                                         break;
 504                                 }
 505
 506                                 rc = bind(rpc->fd, (struct sockaddr *)&ss, socksize);
 507 #if !defined(WIN32)
 508                                 /* we got EACCES, so don't try again */
 509                                 if (rc != 0 && errno == EACCES)
 510                                         break;
 511 #endif
 512                         }
 513                 } while (rc != 0 && portOfs != startOfs);
 514         }
 515
 516         set_nonblocking(rpc->fd);
 517
 518         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 519                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 520                 return -1;
 521         }
 522
 523         return 0;
 524 }
 525
 526 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 527 {
 528         struct addrinfo *ai = NULL;
 529
 530         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 531
 532         if (rpc->fd != -1) {
 533                 rpc_set_error(rpc, "Trying to connect while already connected");
 534                 return -1;
 535         }
 536
 537         if (rpc->is_udp != 0) {
 538                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 539                 return -1;
 540         }
 541
 542         rpc->auto_reconnect = 0;
 543
 544         if (getaddrinfo(server, NULL, NULL, &ai) != 0) {
 545                 rpc_set_error(rpc, "Invalid address:%s. "
 546                               "Can not resolv into IPv4/v6 structure.", server);
 547                 return -1;
 548         }
 549
 550         switch (ai->ai_family) {
 551         case AF_INET:
 552                 ((struct sockaddr_in *)&rpc->s)->sin_family = ai->ai_family;
 553                 ((struct sockaddr_in *)&rpc->s)->sin_port   = htons(port);
 554 #ifdef HAVE_SOCKADDR_LEN
 555                 ((struct sockaddr_in *)&rpc->s)->sin_len = sizeof(struct sockaddr_in);
 556 #endif
 557                 break;
 558         case AF_INET6:
 559                 ((struct sockaddr_in6 *)&rpc->s)->sin6_family = ai->ai_family;
 560                 ((struct sockaddr_in6 *)&rpc->s)->sin6_port   = htons(port);
 561 #ifdef HAVE_SOCKADDR_LEN
 562                 ((struct sockaddr_in6 *)&rpc->s)->sin6_len = sizeof(struct sockaddr_in6);
 563 #endif
 564                 break;
 565         }
 566
 567         rpc->connect_cb  = cb;
 568         rpc->connect_data = private_data;
 569
 570         freeaddrinfo(ai);
 571
 572         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 573                 return -1;
 574         }
 575
 576         return 0;
 577 }
 578
 579 int rpc_disconnect(struct rpc_context *rpc, char *error)
 580 {
 581         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 582
 583         rpc_unset_autoreconnect(rpc);
 584
 585         if (rpc->fd != -1) {
 586                 close(rpc->fd);
 587         }
 588         rpc->fd  = -1;
 589
 590         rpc->is_connected = 0;
 591
 592         rpc_error_all_pdus(rpc, error);
 593
 594         return 0;
 595 }
 596
 597 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 598 {
 599         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 600
 601         if (status != RPC_STATUS_SUCCESS) {
 602                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 603                 return;
 604         }
 605
 606         rpc->is_connected = 1;
 607         rpc->connect_cb   = NULL;
 608 }
 609
 610 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 611 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 612 {
 613         struct rpc_pdu *pdu;
 614         unsigned int i;
 615
 616         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 617
 618         if (rpc->fd != -1) {
 619                 close(rpc->fd);
 620         }
 621         rpc->fd  = -1;
 622
 623         rpc->is_connected = 0;
 624
 625         /* socket is closed so we will not get any replies to any commands
 626          * in flight. Move them all over from the waitpdu queue back to the out queue
 627          */
 628         for (i = 0; i < HASHES; i++) {
 629                 struct rpc_queue *q = &rpc->waitpdu[i];
 630
 631                 for (pdu=q->head; pdu; pdu=pdu->next) {
 632                         rpc_return_to_queue(&rpc->outqueue, pdu);
 633                         /* we have to re-send the whole pdu again */
 634                         pdu->written = 0;
 635                 }
 636                 rpc_reset_queue(q);
 637         }
 638
 639         if (rpc->auto_reconnect != 0) {
 640                 rpc->connect_cb  = reconnect_cb;
 641
 642                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 643                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 644                         return -1;
 645                 }
 646         }
 647
 648         return 0;
 649 }
 650
 651
 652 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 653 {
 654         struct addrinfo *ai = NULL;
 655         char service[6];
 656
 657         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 658
 659         if (rpc->is_udp == 0) {
 660                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 661                 return -1;
 662         }
 663
 664         sprintf(service, "%d", port);
 665         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 666                 rpc_set_error(rpc, "Invalid address:%s. "
 667                               "Can not resolv into IPv4/v6 structure.", addr);
 668                 return -1;
 669         }
 670
 671         switch(ai->ai_family) {
 672         case AF_INET:
 673                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 674                 if (rpc->fd == -1) {
 675                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 676                         freeaddrinfo(ai);
 677                         return -1;
 678                 }
 679
 680                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 681                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 682                         freeaddrinfo(ai);
 683                         return -1;
 684                 }
 685                 break;
 686         default:
 687                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 688                 freeaddrinfo(ai);
 689                 return -1;
 690         }
 691
 692         freeaddrinfo(ai);
 693
 694         return 0;
 695 }
 696
 697 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 698 {
 699         struct addrinfo *ai = NULL;
 700         char service[6];
 701
 702         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 703
 704         if (rpc->is_udp == 0) {
 705                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 706                 return -1;
 707         }
 708
 709         sprintf(service, "%d", port);
 710         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 711                 rpc_set_error(rpc, "Invalid address:%s. "
 712                               "Can not resolv into IPv4/v6 structure.", addr);
 713                 return -1;
 714         }
 715
 716         if (rpc->udp_dest) {
 717                 free(rpc->udp_dest);
 718                 rpc->udp_dest = NULL;
 719         }
 720         rpc->udp_dest = malloc(ai->ai_addrlen);
 721         if (rpc->udp_dest == NULL) {
 722                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 723                 freeaddrinfo(ai);
 724                 return -1;
 725         }
 726         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 727         freeaddrinfo(ai);
 728
 729         rpc->is_broadcast = is_broadcast;
 730         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 731
 732         return 0;
 733 }
 734
 735 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 736 {
 737         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 738
 739         return (struct sockaddr *)&rpc->udp_src;
 740 }
 741
 742 int rpc_queue_length(struct rpc_context *rpc)
 743 {
 744         int i=0;
 745         struct rpc_pdu *pdu;
 746         unsigned int n;
 747
 748         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 749
 750         for(pdu = rpc->outqueue.head; pdu; pdu = pdu->next) {
 751                 i++;
 752         }
 753
 754         for (n = 0; n < HASHES; n++) {
 755                 struct rpc_queue *q = &rpc->waitpdu[n];
 756
 757                 for(pdu = q->head; pdu; pdu = pdu->next)
 758                         i++;
 759         }
 760         return i;
 761 }
 762
 763 void rpc_set_fd(struct rpc_context *rpc, int fd)
 764 {
 765         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 766
 767         rpc->fd = fd;
 768 }