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 <time.h>
  72 #include <sys/types.h>
  73 #include "libnfs-zdr.h"
  74 #include "libnfs.h"
  75 #include "libnfs-raw.h"
  76 #include "libnfs-private.h"
  77 #include "slist.h"
  78
  79 #ifdef WIN32
  80 //has to be included after stdlib!!
  81 #include "win32_errnowrapper.h"
  82 #endif
  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 static void set_nolinger(int fd)
 100 {
 101         struct linger lng;
 102         lng.l_onoff = 1;
 103         lng.l_linger = 0;
 104         setsockopt(fd, SOL_SOCKET, SO_LINGER, &lng, sizeof(lng));
 105 }
 106
 107 #ifdef HAVE_NETINET_TCP_H
 108 int set_tcp_sockopt(int sockfd, int optname, int value)
 109 {
 110         int level;
 111
 112         #if defined(__FreeBSD__) || defined(__sun) || (defined(__APPLE__) && defined(__MACH__))
 113         struct protoent *buf;
 114
 115         if ((buf = getprotobyname("tcp")) != NULL)
 116                 level = buf->p_proto;
 117         else
 118                 return -1;
 119         #else
 120                 level = SOL_TCP;
 121         #endif
 122
 123         return setsockopt(sockfd, level, optname, (char *)&value, sizeof(value));
 124 }
 125 #endif
 126
 127 int rpc_get_fd(struct rpc_context *rpc)
 128 {
 129         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 130
 131         return rpc->fd;
 132 }
 133
 134 static int rpc_has_queue(struct rpc_queue *q)
 135 {
 136         return q->head != NULL;
 137 }
 138
 139 int rpc_which_events(struct rpc_context *rpc)
 140 {
 141         int events;
 142
 143         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 144
 145         events = rpc->is_connected ? POLLIN : POLLOUT;
 146
 147         if (rpc->is_udp != 0) {
 148                 /* for udp sockets we only wait for pollin */
 149                 return POLLIN;
 150         }
 151
 152         if (rpc_has_queue(&rpc->outqueue)) {
 153                 events |= POLLOUT;
 154         }
 155         return events;
 156 }
 157
 158 static int rpc_write_to_socket(struct rpc_context *rpc)
 159 {
 160         int32_t count;
 161         struct rpc_pdu *pdu;
 162
 163         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 164
 165         if (rpc->fd == -1) {
 166                 rpc_set_error(rpc, "trying to write but not connected");
 167                 return -1;
 168         }
 169
 170         while ((pdu = rpc->outqueue.head) != NULL) {
 171                 int64_t total;
 172
 173                 total = pdu->outdata.size;
 174
 175                 count = send(rpc->fd, pdu->outdata.data + pdu->written, total - pdu->written, 0);
 176                 if (count == -1) {
 177                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 178                                 return 0;
 179                         }
 180                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 181                         return -1;
 182                 }
 183
 184                 pdu->written += count;
 185                 if (pdu->written == total) {
 186                         unsigned int hash;
 187
 188                         rpc->outqueue.head = pdu->next;
 189                         if (pdu->next == NULL)
 190                                 rpc->outqueue.tail = NULL;
 191
 192                         hash = rpc_hash_xid(pdu->xid);
 193                         rpc_enqueue(&rpc->waitpdu[hash], pdu);
 194                 }
 195         }
 196         return 0;
 197 }
 198
 199 static int rpc_read_from_socket(struct rpc_context *rpc)
 200 {
 201         int available;
 202         int size;
 203         int pdu_size;
 204         int32_t count;
 205
 206         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 207
 208         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 209                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 210                 return -1;
 211         }
 212
 213         if (available == 0) {
 214                 rpc_set_error(rpc, "Socket has been closed");
 215                 return -1;
 216         }
 217
 218         if (rpc->is_udp) {
 219                 char *buf;
 220                 socklen_t socklen = sizeof(rpc->udp_src);
 221
 222                 buf = malloc(available);
 223                 if (buf == NULL) {
 224                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 225                         return -1;
 226                 }
 227                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 228                 if (count < 0) {
 229                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 230                         free(buf);
 231                         return -1;
 232                 }
 233                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 234                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 235                         free(buf);
 236                         return -1;
 237                 }
 238                 free(buf);
 239                 return 0;
 240         }
 241
 242         /* read record marker, 4 bytes at the beginning of every pdu */
 243         if (rpc->inbuf == NULL) {
 244                 rpc->insize = 4;
 245                 rpc->inbuf = malloc(rpc->insize);
 246                 if (rpc->inbuf == NULL) {
 247                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 248                         return -1;
 249                 }
 250         }
 251         if (rpc->inpos < 4) {
 252                 size = 4 - rpc->inpos;
 253
 254                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 255                 if (count == -1) {
 256                         if (errno == EINTR) {
 257                                 return 0;
 258                         }
 259                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 260                         return -1;
 261                 }
 262                 available  -= count;
 263                 rpc->inpos += count;
 264         }
 265
 266         if (available == 0) {
 267                 return 0;
 268         }
 269
 270         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 271         if (rpc->insize < pdu_size) {
 272                 unsigned char *buf;
 273
 274                 buf = malloc(pdu_size);
 275                 if (buf == NULL) {
 276                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 277                         return -1;
 278                 }
 279                 memcpy(buf, rpc->inbuf, rpc->insize);
 280                 free(rpc->inbuf);
 281                 rpc->inbuf  = buf;
 282                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 283         }
 284
 285         size = available;
 286         if (size > rpc->insize - rpc->inpos) {
 287                 size = rpc->insize - rpc->inpos;
 288         }
 289
 290         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 291         if (count == -1) {
 292                 if (errno == EINTR) {
 293                         return 0;
 294                 }
 295                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 296                 return -1;
 297         }
 298         available  -= count;
 299         rpc->inpos += count;
 300
 301         if (rpc->inpos == rpc->insize) {
 302                 char *buf = rpc->inbuf;
 303
 304                 rpc->inbuf  = NULL;
 305                 rpc->insize = 0;
 306                 rpc->inpos  = 0;
 307
 308                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 309                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 310                         return -1;
 311                 }
 312                 free(buf);
 313         }
 314
 315         return 0;
 316 }
 317
 318
 319
 320 int rpc_service(struct rpc_context *rpc, int revents)
 321 {
 322         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 323
 324         if (revents & POLLERR) {
 325 #ifdef WIN32
 326                 char err = 0;
 327 #else
 328                 int err = 0;
 329 #endif
 330                 socklen_t err_size = sizeof(err);
 331
 332                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 333                                 (char *)&err, &err_size) != 0 || err != 0) {
 334                         if (err == 0) {
 335                                 err = errno;
 336                         }
 337                         rpc_set_error(rpc, "rpc_service: socket error "
 338                                                "%s(%d).",
 339                                                strerror(err), err);
 340                 } else {
 341                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 342                                                 "Unknown socket error.");
 343                 }
 344                 if (rpc->connect_cb != NULL) {
 345                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 346                 }
 347                 return -1;
 348         }
 349         if (revents & POLLHUP) {
 350                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 351                 if (rpc->connect_cb != NULL) {
 352                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 353                 }
 354                 return -1;
 355         }
 356
 357         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 358                 int err = 0;
 359                 socklen_t err_size = sizeof(err);
 360
 361                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 362                                 (char *)&err, &err_size) != 0 || err != 0) {
 363                         if (err == 0) {
 364                                 err = errno;
 365                         }
 366                         rpc_set_error(rpc, "rpc_service: socket error "
 367                                         "%s(%d) while connecting.",
 368                                         strerror(err), err);
 369                         if (rpc->connect_cb != NULL) {
 370                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 371                                         NULL, rpc->connect_data);
 372                         }
 373                         return -1;
 374                 }
 375
 376                 rpc->is_connected = 1;
 377                 if (rpc->connect_cb != NULL) {
 378                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 379                 }
 380                 return 0;
 381         }
 382
 383         if (revents & POLLIN) {
 384                 if (rpc_read_from_socket(rpc) != 0) {
 385                         rpc_reconnect_requeue(rpc);
 386                         return 0;
 387                 }
 388         }
 389
 390         if (revents & POLLOUT && rpc_has_queue(&rpc->outqueue)) {
 391                 if (rpc_write_to_socket(rpc) != 0) {
 392                         rpc_set_error(rpc, "write to socket failed");
 393                         return -1;
 394                 }
 395         }
 396
 397         return 0;
 398 }
 399
 400 void rpc_set_autoreconnect(struct rpc_context *rpc)
 401 {
 402         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 403
 404         rpc->auto_reconnect = 1;
 405 }
 406
 407 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 408 {
 409         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 410
 411         rpc->auto_reconnect = 0;
 412 }
 413
 414 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 415 {
 416         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 417
 418         rpc->tcp_syncnt = v;
 419 }
 420
 421 #ifndef TCP_SYNCNT
 422 #define TCP_SYNCNT        7
 423 #endif
 424
 425 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 426 {
 427         int socksize;
 428
 429         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 430
 431         switch (s->ss_family) {
 432         case AF_INET:
 433                 socksize = sizeof(struct sockaddr_in);
 434                 rpc->fd = socket(AF_INET, 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         case AF_INET6:
 442                 socksize = sizeof(struct sockaddr_in6);
 443                 rpc->fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 444 #ifdef HAVE_NETINET_TCP_H
 445                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 446                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 447                 }
 448 #endif
 449                 break;
 450         default:
 451                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 452                 return -1;
 453         }
 454
 455         if (rpc->fd == -1) {
 456                 rpc_set_error(rpc, "Failed to open socket");
 457                 return -1;
 458         }
 459
 460         /* Some systems allow you to set capabilities on an executable
 461          * to allow the file to be executed with privilege to bind to
 462          * privileged system ports, even if the user is not root.
 463          *
 464          * Opportunistically try to bind the socket to a low numbered
 465          * system port in the hope that the user is either root or the
 466          * executable has the CAP_NET_BIND_SERVICE.
 467          *
 468          * As soon as we fail the bind() with EACCES we know we will never
 469          * be able to bind to a system port so we terminate the loop.
 470          *
 471          * On linux, use
 472          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 473          * to make the executable able to bind to a system port.
 474          *
 475          * On Windows, there is no concept of privileged ports. Thus
 476          * binding will usually succeed.
 477          */
 478         {
 479                 struct sockaddr_storage ss;
 480                 static int portOfs = 0;
 481                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 482                 const int portCount = IPPORT_RESERVED - firstPort;
 483                 int startOfs, port, rc;
 484
 485                 if (portOfs == 0) {
 486                         portOfs = time(NULL) % 400;
 487                 }
 488                 startOfs = portOfs;
 489                 do {
 490                         rc = -1;
 491                         port = htons(firstPort + portOfs);
 492                         portOfs = (portOfs + 1) % portCount;
 493
 494                         /* skip well-known ports */
 495                         if (!getservbyport(port, "tcp")) {
 496                                 memset(&ss, 0, sizeof(ss));
 497
 498                                 switch (s->ss_family) {
 499                                 case AF_INET:
 500                                         ((struct sockaddr_in *)&ss)->sin_port = port;
 501                                         ((struct sockaddr_in *)&ss)->sin_family      = AF_INET;
 502 #ifdef HAVE_SOCKADDR_LEN
 503                                         ((struct sockaddr_in *)&ss)->sin_len = sizeof(struct sockaddr_in);
 504 #endif
 505                                         break;
 506                                 case AF_INET6:
 507                                         ((struct sockaddr_in6 *)&ss)->sin6_port = port;
 508                                         ((struct sockaddr_in6 *)&ss)->sin6_family      = AF_INET6;
 509 #ifdef HAVE_SOCKADDR_LEN
 510                                         ((struct sockaddr_in6 *)&ss)->sin6_len = sizeof(struct sockaddr_in6);
 511 #endif
 512                                         break;
 513                                 }
 514
 515                                 rc = bind(rpc->fd, (struct sockaddr *)&ss, socksize);
 516 #if !defined(WIN32)
 517                                 /* we got EACCES, so don't try again */
 518                                 if (rc != 0 && errno == EACCES)
 519                                         break;
 520 #endif
 521                         }
 522                 } while (rc != 0 && portOfs != startOfs);
 523         }
 524
 525         set_nonblocking(rpc->fd);
 526         set_nolinger(rpc->fd);
 527
 528         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 529                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 530                 return -1;
 531         }
 532
 533         return 0;
 534 }
 535
 536 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 537 {
 538         struct addrinfo *ai = NULL;
 539
 540         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 541
 542         if (rpc->fd != -1) {
 543                 rpc_set_error(rpc, "Trying to connect while already connected");
 544                 return -1;
 545         }
 546
 547         if (rpc->is_udp != 0) {
 548                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 549                 return -1;
 550         }
 551
 552         rpc->auto_reconnect = 0;
 553
 554         if (getaddrinfo(server, NULL, NULL, &ai) != 0) {
 555                 rpc_set_error(rpc, "Invalid address:%s. "
 556                               "Can not resolv into IPv4/v6 structure.", server);
 557                 return -1;
 558         }
 559
 560         switch (ai->ai_family) {
 561         case AF_INET:
 562                 ((struct sockaddr_in *)&rpc->s)->sin_family = ai->ai_family;
 563                 ((struct sockaddr_in *)&rpc->s)->sin_port   = htons(port);
 564                 ((struct sockaddr_in *)&rpc->s)->sin_addr   = ((struct sockaddr_in *)(ai->ai_addr))->sin_addr;
 565 #ifdef HAVE_SOCKADDR_LEN
 566                 ((struct sockaddr_in *)&rpc->s)->sin_len = sizeof(struct sockaddr_in);
 567 #endif
 568                 break;
 569         case AF_INET6:
 570                 ((struct sockaddr_in6 *)&rpc->s)->sin6_family = ai->ai_family;
 571                 ((struct sockaddr_in6 *)&rpc->s)->sin6_port   = htons(port);
 572                 ((struct sockaddr_in6 *)&rpc->s)->sin6_addr   = ((struct sockaddr_in6 *)(ai->ai_addr))->sin6_addr;
 573 #ifdef HAVE_SOCKADDR_LEN
 574                 ((struct sockaddr_in6 *)&rpc->s)->sin6_len = sizeof(struct sockaddr_in6);
 575 #endif
 576                 break;
 577         }
 578
 579         rpc->connect_cb  = cb;
 580         rpc->connect_data = private_data;
 581
 582         freeaddrinfo(ai);
 583
 584         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 585                 return -1;
 586         }
 587
 588         return 0;
 589 }
 590
 591 int rpc_disconnect(struct rpc_context *rpc, char *error)
 592 {
 593         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 594
 595         rpc_unset_autoreconnect(rpc);
 596
 597         if (rpc->fd != -1) {
 598                 close(rpc->fd);
 599         }
 600         rpc->fd  = -1;
 601
 602         rpc->is_connected = 0;
 603
 604         rpc_error_all_pdus(rpc, error);
 605
 606         return 0;
 607 }
 608
 609 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 610 {
 611         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 612
 613         if (status != RPC_STATUS_SUCCESS) {
 614                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 615                 return;
 616         }
 617
 618         rpc->is_connected = 1;
 619         rpc->connect_cb   = NULL;
 620 }
 621
 622 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 623 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 624 {
 625         struct rpc_pdu *pdu;
 626         unsigned int i;
 627
 628         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 629
 630         if (rpc->fd != -1) {
 631                 close(rpc->fd);
 632         }
 633         rpc->fd  = -1;
 634
 635         rpc->is_connected = 0;
 636
 637         /* socket is closed so we will not get any replies to any commands
 638          * in flight. Move them all over from the waitpdu queue back to the out queue
 639          */
 640         for (i = 0; i < HASHES; i++) {
 641                 struct rpc_queue *q = &rpc->waitpdu[i];
 642
 643                 for (pdu=q->head; pdu; pdu=pdu->next) {
 644                         rpc_return_to_queue(&rpc->outqueue, pdu);
 645                         /* we have to re-send the whole pdu again */
 646                         pdu->written = 0;
 647                 }
 648                 rpc_reset_queue(q);
 649         }
 650
 651         if (rpc->auto_reconnect != 0) {
 652                 rpc->connect_cb  = reconnect_cb;
 653
 654                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 655                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 656                         return -1;
 657                 }
 658         }
 659
 660         return 0;
 661 }
 662
 663
 664 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 665 {
 666         struct addrinfo *ai = NULL;
 667         char service[6];
 668
 669         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 670
 671         if (rpc->is_udp == 0) {
 672                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 673                 return -1;
 674         }
 675
 676         sprintf(service, "%d", port);
 677         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 678                 rpc_set_error(rpc, "Invalid address:%s. "
 679                               "Can not resolv into IPv4/v6 structure.", addr);
 680                 return -1;
 681         }
 682
 683         switch(ai->ai_family) {
 684         case AF_INET:
 685                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 686                 if (rpc->fd == -1) {
 687                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 688                         freeaddrinfo(ai);
 689                         return -1;
 690                 }
 691
 692                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 693                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 694                         freeaddrinfo(ai);
 695                         return -1;
 696                 }
 697                 break;
 698         default:
 699                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 700                 freeaddrinfo(ai);
 701                 return -1;
 702         }
 703
 704         freeaddrinfo(ai);
 705
 706         return 0;
 707 }
 708
 709 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 710 {
 711         struct addrinfo *ai = NULL;
 712         char service[6];
 713
 714         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 715
 716         if (rpc->is_udp == 0) {
 717                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 718                 return -1;
 719         }
 720
 721         sprintf(service, "%d", port);
 722         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 723                 rpc_set_error(rpc, "Invalid address:%s. "
 724                               "Can not resolv into IPv4/v6 structure.", addr);
 725                 return -1;
 726         }
 727
 728         if (rpc->udp_dest) {
 729                 free(rpc->udp_dest);
 730                 rpc->udp_dest = NULL;
 731         }
 732         rpc->udp_dest = malloc(ai->ai_addrlen);
 733         if (rpc->udp_dest == NULL) {
 734                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 735                 freeaddrinfo(ai);
 736                 return -1;
 737         }
 738         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 739         freeaddrinfo(ai);
 740
 741         rpc->is_broadcast = is_broadcast;
 742         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 743
 744         return 0;
 745 }
 746
 747 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 748 {
 749         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 750
 751         return (struct sockaddr *)&rpc->udp_src;
 752 }
 753
 754 int rpc_queue_length(struct rpc_context *rpc)
 755 {
 756         int i=0;
 757         struct rpc_pdu *pdu;
 758         unsigned int n;
 759
 760         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 761
 762         for(pdu = rpc->outqueue.head; pdu; pdu = pdu->next) {
 763                 i++;
 764         }
 765
 766         for (n = 0; n < HASHES; n++) {
 767                 struct rpc_queue *q = &rpc->waitpdu[n];
 768
 769                 for(pdu = q->head; pdu; pdu = pdu->next)
 770                         i++;
 771         }
 772         return i;
 773 }
 774
 775 void rpc_set_fd(struct rpc_context *rpc, int fd)
 776 {
 777         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 778
 779         rpc->fd = fd;
 780 }