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 static int rpc_has_queue(struct rpc_queue *q)
 134 {
 135         return q->head != NULL;
 136 }
 137
 138 int rpc_which_events(struct rpc_context *rpc)
 139 {
 140         int events;
 141
 142         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 143
 144         events = rpc->is_connected ? POLLIN : POLLOUT;
 145
 146         if (rpc->is_udp != 0) {
 147                 /* for udp sockets we only wait for pollin */
 148                 return POLLIN;
 149         }
 150
 151         if (rpc_has_queue(&rpc->outqueue)) {
 152                 events |= POLLOUT;
 153         }
 154         return events;
 155 }
 156
 157 static int rpc_write_to_socket(struct rpc_context *rpc)
 158 {
 159         int32_t count;
 160         struct rpc_pdu *pdu;
 161
 162         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 163
 164         if (rpc->fd == -1) {
 165                 rpc_set_error(rpc, "trying to write but not connected");
 166                 return -1;
 167         }
 168
 169         while ((pdu = rpc->outqueue.head) != NULL) {
 170                 int64_t total;
 171
 172                 total = pdu->outdata.size;
 173
 174                 count = send(rpc->fd, pdu->outdata.data + pdu->written, total - pdu->written, 0);
 175                 if (count == -1) {
 176                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 177                                 return 0;
 178                         }
 179                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 180                         return -1;
 181                 }
 182
 183                 pdu->written += count;
 184                 if (pdu->written == total) {
 185                         unsigned int hash;
 186
 187                         rpc->outqueue.head = pdu->next;
 188                         if (pdu->next == NULL)
 189                                 rpc->outqueue.tail = NULL;
 190
 191                         hash = rpc_hash_xid(pdu->xid);
 192                         rpc_enqueue(&rpc->waitpdu[hash], pdu);
 193                 }
 194         }
 195         return 0;
 196 }
 197
 198 static int rpc_read_from_socket(struct rpc_context *rpc)
 199 {
 200         int available;
 201         int size;
 202         int pdu_size;
 203         int32_t count;
 204
 205         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 206
 207         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 208                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 209                 return -1;
 210         }
 211
 212         if (available == 0) {
 213                 rpc_set_error(rpc, "Socket has been closed");
 214                 return -1;
 215         }
 216
 217         if (rpc->is_udp) {
 218                 char *buf;
 219                 socklen_t socklen = sizeof(rpc->udp_src);
 220
 221                 buf = malloc(available);
 222                 if (buf == NULL) {
 223                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 224                         return -1;
 225                 }
 226                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 227                 if (count < 0) {
 228                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 229                         free(buf);
 230                         return -1;
 231                 }
 232                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 233                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 234                         free(buf);
 235                         return -1;
 236                 }
 237                 free(buf);
 238                 return 0;
 239         }
 240
 241         /* read record marker, 4 bytes at the beginning of every pdu */
 242         if (rpc->inbuf == NULL) {
 243                 rpc->insize = 4;
 244                 rpc->inbuf = malloc(rpc->insize);
 245                 if (rpc->inbuf == NULL) {
 246                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 247                         return -1;
 248                 }
 249         }
 250         if (rpc->inpos < 4) {
 251                 size = 4 - rpc->inpos;
 252
 253                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 254                 if (count == -1) {
 255                         if (errno == EINTR) {
 256                                 return 0;
 257                         }
 258                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 259                         return -1;
 260                 }
 261                 available  -= count;
 262                 rpc->inpos += count;
 263         }
 264
 265         if (available == 0) {
 266                 return 0;
 267         }
 268
 269         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 270         if (rpc->insize < pdu_size) {
 271                 unsigned char *buf;
 272
 273                 buf = malloc(pdu_size);
 274                 if (buf == NULL) {
 275                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 276                         return -1;
 277                 }
 278                 memcpy(buf, rpc->inbuf, rpc->insize);
 279                 free(rpc->inbuf);
 280                 rpc->inbuf  = buf;
 281                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 282         }
 283
 284         size = available;
 285         if (size > rpc->insize - rpc->inpos) {
 286                 size = rpc->insize - rpc->inpos;
 287         }
 288
 289         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 290         if (count == -1) {
 291                 if (errno == EINTR) {
 292                         return 0;
 293                 }
 294                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 295                 return -1;
 296         }
 297         available  -= count;
 298         rpc->inpos += count;
 299
 300         if (rpc->inpos == rpc->insize) {
 301                 char *buf = rpc->inbuf;
 302
 303                 rpc->inbuf  = NULL;
 304                 rpc->insize = 0;
 305                 rpc->inpos  = 0;
 306
 307                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 308                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 309                         return -1;
 310                 }
 311                 free(buf);
 312         }
 313
 314         return 0;
 315 }
 316
 317
 318
 319 int rpc_service(struct rpc_context *rpc, int revents)
 320 {
 321         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 322
 323         if (revents & POLLERR) {
 324 #ifdef WIN32
 325                 char err = 0;
 326 #else
 327                 int err = 0;
 328 #endif
 329                 socklen_t err_size = sizeof(err);
 330
 331                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 332                                 (char *)&err, &err_size) != 0 || err != 0) {
 333                         if (err == 0) {
 334                                 err = errno;
 335                         }
 336                         rpc_set_error(rpc, "rpc_service: socket error "
 337                                                "%s(%d).",
 338                                                strerror(err), err);
 339                 } else {
 340                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 341                                                 "Unknown socket error.");
 342                 }
 343                 if (rpc->connect_cb != NULL) {
 344                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 345                 }
 346                 return -1;
 347         }
 348         if (revents & POLLHUP) {
 349                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 350                 if (rpc->connect_cb != NULL) {
 351                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 352                 }
 353                 return -1;
 354         }
 355
 356         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 357                 int err = 0;
 358                 socklen_t err_size = sizeof(err);
 359
 360                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 361                                 (char *)&err, &err_size) != 0 || err != 0) {
 362                         if (err == 0) {
 363                                 err = errno;
 364                         }
 365                         rpc_set_error(rpc, "rpc_service: socket error "
 366                                         "%s(%d) while connecting.",
 367                                         strerror(err), err);
 368                         if (rpc->connect_cb != NULL) {
 369                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 370                                         NULL, rpc->connect_data);
 371                         }
 372                         return -1;
 373                 }
 374
 375                 rpc->is_connected = 1;
 376                 if (rpc->connect_cb != NULL) {
 377                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 378                 }
 379                 return 0;
 380         }
 381
 382         if (revents & POLLIN) {
 383                 if (rpc_read_from_socket(rpc) != 0) {
 384                         rpc_reconnect_requeue(rpc);
 385                         return 0;
 386                 }
 387         }
 388
 389         if (revents & POLLOUT && rpc_has_queue(&rpc->outqueue)) {
 390                 if (rpc_write_to_socket(rpc) != 0) {
 391                         rpc_set_error(rpc, "write to socket failed");
 392                         return -1;
 393                 }
 394         }
 395
 396         return 0;
 397 }
 398
 399 void rpc_set_autoreconnect(struct rpc_context *rpc)
 400 {
 401         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 402
 403         rpc->auto_reconnect = 1;
 404 }
 405
 406 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 407 {
 408         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 409
 410         rpc->auto_reconnect = 0;
 411 }
 412
 413 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 414 {
 415         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 416
 417         rpc->tcp_syncnt = v;
 418 }
 419
 420 #ifndef TCP_SYNCNT
 421 #define TCP_SYNCNT        7
 422 #endif
 423
 424 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 425 {
 426         int socksize;
 427
 428         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 429
 430         switch (s->ss_family) {
 431         case AF_INET:
 432                 socksize = sizeof(struct sockaddr_in);
 433                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 434 #ifdef HAVE_NETINET_TCP_H
 435                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 436                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 437                 }
 438 #endif
 439                 break;
 440         case AF_INET6:
 441                 socksize = sizeof(struct sockaddr_in6);
 442                 rpc->fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 443 #ifdef HAVE_NETINET_TCP_H
 444                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 445                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 446                 }
 447 #endif
 448                 break;
 449         default:
 450                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 451                 return -1;
 452         }
 453
 454         if (rpc->fd == -1) {
 455                 rpc_set_error(rpc, "Failed to open socket");
 456                 return -1;
 457         }
 458
 459         /* Some systems allow you to set capabilities on an executable
 460          * to allow the file to be executed with privilege to bind to
 461          * privileged system ports, even if the user is not root.
 462          *
 463          * Opportunistically try to bind the socket to a low numbered
 464          * system port in the hope that the user is either root or the
 465          * executable has the CAP_NET_BIND_SERVICE.
 466          *
 467          * As soon as we fail the bind() with EACCES we know we will never
 468          * be able to bind to a system port so we terminate the loop.
 469          *
 470          * On linux, use
 471          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 472          * to make the executable able to bind to a system port.
 473          *
 474          * On Windows, there is no concept of privileged ports. Thus
 475          * binding will usually succeed.
 476          */
 477         {
 478                 struct sockaddr_storage ss;
 479                 static int portOfs = 0;
 480                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 481                 const int portCount = IPPORT_RESERVED - firstPort;
 482                 int startOfs, port, rc;
 483
 484                 if (portOfs == 0) {
 485                         portOfs = time(NULL) % 400;
 486                 }
 487                 startOfs = portOfs;
 488                 do {
 489                         rc = -1;
 490                         port = htons(firstPort + portOfs);
 491                         portOfs = (portOfs + 1) % portCount;
 492
 493                         /* skip well-known ports */
 494                         if (!getservbyport(port, "tcp")) {
 495                                 memset(&ss, 0, sizeof(ss));
 496
 497                                 switch (s->ss_family) {
 498                                 case AF_INET:
 499                                         ((struct sockaddr_in *)&ss)->sin_port = port;
 500                                         ((struct sockaddr_in *)&ss)->sin_family      = AF_INET;
 501 #ifdef HAVE_SOCKADDR_LEN
 502                                         ((struct sockaddr_in *)&ss)->sin_len = sizeof(struct sockaddr_in);
 503 #endif
 504                                         break;
 505                                 case AF_INET6:
 506                                         ((struct sockaddr_in6 *)&ss)->sin6_port = port;
 507                                         ((struct sockaddr_in6 *)&ss)->sin6_family      = AF_INET6;
 508 #ifdef HAVE_SOCKADDR_LEN
 509                                         ((struct sockaddr_in6 *)&ss)->sin6_len = sizeof(struct sockaddr6_in);
 510 #endif
 511                                         break;
 512                                 }
 513
 514                                 rc = bind(rpc->fd, (struct sockaddr *)&ss, socksize);
 515 #if !defined(WIN32)
 516                                 /* we got EACCES, so don't try again */
 517                                 if (rc != 0 && errno == EACCES)
 518                                         break;
 519 #endif
 520                         }
 521                 } while (rc != 0 && portOfs != startOfs);
 522         }
 523
 524         set_nonblocking(rpc->fd);
 525         set_nolinger(rpc->fd);
 526
 527         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 528                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 529                 return -1;
 530         }
 531
 532         return 0;
 533 }
 534
 535 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 536 {
 537         struct addrinfo *ai = NULL;
 538
 539         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 540
 541         if (rpc->fd != -1) {
 542                 rpc_set_error(rpc, "Trying to connect while already connected");
 543                 return -1;
 544         }
 545
 546         if (rpc->is_udp != 0) {
 547                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 548                 return -1;
 549         }
 550
 551         rpc->auto_reconnect = 0;
 552
 553         if (getaddrinfo(server, NULL, NULL, &ai) != 0) {
 554                 rpc_set_error(rpc, "Invalid address:%s. "
 555                               "Can not resolv into IPv4/v6 structure.", server);
 556                 return -1;
 557         }
 558
 559         switch (ai->ai_family) {
 560         case AF_INET:
 561                 ((struct sockaddr_in *)&rpc->s)->sin_family = ai->ai_family;
 562                 ((struct sockaddr_in *)&rpc->s)->sin_port   = htons(port);
 563                 ((struct sockaddr_in *)&rpc->s)->sin_addr   = ((struct sockaddr_in *)(ai->ai_addr))->sin_addr;
 564 #ifdef HAVE_SOCKADDR_LEN
 565                 ((struct sockaddr_in *)&rpc->s)->sin_len = sizeof(struct sockaddr_in);
 566 #endif
 567                 break;
 568         case AF_INET6:
 569                 ((struct sockaddr_in6 *)&rpc->s)->sin6_family = ai->ai_family;
 570                 ((struct sockaddr_in6 *)&rpc->s)->sin6_port   = htons(port);
 571                 ((struct sockaddr_in6 *)&rpc->s)->sin6_addr   = ((struct sockaddr_in6 *)(ai->ai_addr))->sin6_addr;
 572 #ifdef HAVE_SOCKADDR_LEN
 573                 ((struct sockaddr_in6 *)&rpc->s)->sin6_len = sizeof(struct sockaddr_in6);
 574 #endif
 575                 break;
 576         }
 577
 578         rpc->connect_cb  = cb;
 579         rpc->connect_data = private_data;
 580
 581         freeaddrinfo(ai);
 582
 583         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 584                 return -1;
 585         }
 586
 587         return 0;
 588 }
 589
 590 int rpc_disconnect(struct rpc_context *rpc, char *error)
 591 {
 592         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 593
 594         rpc_unset_autoreconnect(rpc);
 595
 596         if (rpc->fd != -1) {
 597                 close(rpc->fd);
 598         }
 599         rpc->fd  = -1;
 600
 601         rpc->is_connected = 0;
 602
 603         rpc_error_all_pdus(rpc, error);
 604
 605         return 0;
 606 }
 607
 608 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 609 {
 610         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 611
 612         if (status != RPC_STATUS_SUCCESS) {
 613                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 614                 return;
 615         }
 616
 617         rpc->is_connected = 1;
 618         rpc->connect_cb   = NULL;
 619 }
 620
 621 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 622 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 623 {
 624         struct rpc_pdu *pdu;
 625         unsigned int i;
 626
 627         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 628
 629         if (rpc->fd != -1) {
 630                 close(rpc->fd);
 631         }
 632         rpc->fd  = -1;
 633
 634         rpc->is_connected = 0;
 635
 636         /* socket is closed so we will not get any replies to any commands
 637          * in flight. Move them all over from the waitpdu queue back to the out queue
 638          */
 639         for (i = 0; i < HASHES; i++) {
 640                 struct rpc_queue *q = &rpc->waitpdu[i];
 641
 642                 for (pdu=q->head; pdu; pdu=pdu->next) {
 643                         rpc_return_to_queue(&rpc->outqueue, pdu);
 644                         /* we have to re-send the whole pdu again */
 645                         pdu->written = 0;
 646                 }
 647                 rpc_reset_queue(q);
 648         }
 649
 650         if (rpc->auto_reconnect != 0) {
 651                 rpc->connect_cb  = reconnect_cb;
 652
 653                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 654                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 655                         return -1;
 656                 }
 657         }
 658
 659         return 0;
 660 }
 661
 662
 663 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 664 {
 665         struct addrinfo *ai = NULL;
 666         char service[6];
 667
 668         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 669
 670         if (rpc->is_udp == 0) {
 671                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 672                 return -1;
 673         }
 674
 675         sprintf(service, "%d", port);
 676         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 677                 rpc_set_error(rpc, "Invalid address:%s. "
 678                               "Can not resolv into IPv4/v6 structure.", addr);
 679                 return -1;
 680         }
 681
 682         switch(ai->ai_family) {
 683         case AF_INET:
 684                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 685                 if (rpc->fd == -1) {
 686                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 687                         freeaddrinfo(ai);
 688                         return -1;
 689                 }
 690
 691                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 692                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 693                         freeaddrinfo(ai);
 694                         return -1;
 695                 }
 696                 break;
 697         default:
 698                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 699                 freeaddrinfo(ai);
 700                 return -1;
 701         }
 702
 703         freeaddrinfo(ai);
 704
 705         return 0;
 706 }
 707
 708 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 709 {
 710         struct addrinfo *ai = NULL;
 711         char service[6];
 712
 713         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 714
 715         if (rpc->is_udp == 0) {
 716                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 717                 return -1;
 718         }
 719
 720         sprintf(service, "%d", port);
 721         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 722                 rpc_set_error(rpc, "Invalid address:%s. "
 723                               "Can not resolv into IPv4/v6 structure.", addr);
 724                 return -1;
 725         }
 726
 727         if (rpc->udp_dest) {
 728                 free(rpc->udp_dest);
 729                 rpc->udp_dest = NULL;
 730         }
 731         rpc->udp_dest = malloc(ai->ai_addrlen);
 732         if (rpc->udp_dest == NULL) {
 733                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 734                 freeaddrinfo(ai);
 735                 return -1;
 736         }
 737         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 738         freeaddrinfo(ai);
 739
 740         rpc->is_broadcast = is_broadcast;
 741         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 742
 743         return 0;
 744 }
 745
 746 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 747 {
 748         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 749
 750         return (struct sockaddr *)&rpc->udp_src;
 751 }
 752
 753 int rpc_queue_length(struct rpc_context *rpc)
 754 {
 755         int i=0;
 756         struct rpc_pdu *pdu;
 757         unsigned int n;
 758
 759         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 760
 761         for(pdu = rpc->outqueue.head; pdu; pdu = pdu->next) {
 762                 i++;
 763         }
 764
 765         for (n = 0; n < HASHES; n++) {
 766                 struct rpc_queue *q = &rpc->waitpdu[n];
 767
 768                 for(pdu = q->head; pdu; pdu = pdu->next)
 769                         i++;
 770         }
 771         return i;
 772 }
 773
 774 void rpc_set_fd(struct rpc_context *rpc, int fd)
 775 {
 776         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 777
 778         rpc->fd = fd;
 779 }