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