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_IN_H
  50 #include <netinet/in.h>
  51 #endif
  52
  53 #ifdef HAVE_NETINET_TCP_H
  54 #include <netinet/tcp.h>
  55 #endif
  56
  57 #ifdef HAVE_NETDB_H
  58 #include <netdb.h>
  59 #endif
  60
  61 #ifdef HAVE_SYS_FILIO_H
  62 #include <sys/filio.h>
  63 #endif
  64
  65 #ifdef HAVE_SYS_SOCKIO_H
  66 #include <sys/sockio.h>
  67 #endif
  68
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <assert.h>
  72 #include <fcntl.h>
  73 #include <string.h>
  74 #include <errno.h>
  75 #include <time.h>
  76 #include <sys/types.h>
  77 #include "libnfs-zdr.h"
  78 #include "libnfs.h"
  79 #include "libnfs-raw.h"
  80 #include "libnfs-private.h"
  81 #include "slist.h"
  82
  83 #ifdef WIN32
  84 //has to be included after stdlib!!
  85 #include "win32_errnowrapper.h"
  86 #endif
  87
  88 static int rpc_reconnect_requeue(struct rpc_context *rpc);
  89 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s);
  90
  91 static void set_nonblocking(int fd)
  92 {
  93         int v = 0;
  94 #if defined(WIN32)
  95         long nonblocking=1;
  96         v = ioctl(fd, FIONBIO, &nonblocking);
  97 #else
  98         v = fcntl(fd, F_GETFL, 0);
  99         fcntl(fd, F_SETFL, v | O_NONBLOCK);
 100 #endif //FIXME
 101 }
 102
 103 static void set_nolinger(int fd)
 104 {
 105         struct linger lng;
 106         lng.l_onoff = 1;
 107         lng.l_linger = 0;
 108         setsockopt(fd, SOL_SOCKET, SO_LINGER, &lng, sizeof(lng));
 109 }
 110
 111 #ifdef HAVE_NETINET_TCP_H
 112 int set_tcp_sockopt(int sockfd, int optname, int value)
 113 {
 114         int level;
 115
 116         #if defined(__FreeBSD__) || defined(__sun) || (defined(__APPLE__) && defined(__MACH__))
 117         struct protoent *buf;
 118
 119         if ((buf = getprotobyname("tcp")) != NULL)
 120                 level = buf->p_proto;
 121         else
 122                 return -1;
 123         #else
 124                 level = SOL_TCP;
 125         #endif
 126
 127         return setsockopt(sockfd, level, optname, (char *)&value, sizeof(value));
 128 }
 129 #endif
 130
 131 int rpc_get_fd(struct rpc_context *rpc)
 132 {
 133         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 134
 135         return rpc->fd;
 136 }
 137
 138 static int rpc_has_queue(struct rpc_queue *q)
 139 {
 140         return q->head != NULL;
 141 }
 142
 143 int rpc_which_events(struct rpc_context *rpc)
 144 {
 145         int events;
 146
 147         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 148
 149         events = rpc->is_connected ? POLLIN : POLLOUT;
 150
 151         if (rpc->is_udp != 0) {
 152                 /* for udp sockets we only wait for pollin */
 153                 return POLLIN;
 154         }
 155
 156         if (rpc_has_queue(&rpc->outqueue)) {
 157                 events |= POLLOUT;
 158         }
 159         return events;
 160 }
 161
 162 static int rpc_write_to_socket(struct rpc_context *rpc)
 163 {
 164         int32_t count;
 165         struct rpc_pdu *pdu;
 166
 167         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 168
 169         if (rpc->fd == -1) {
 170                 rpc_set_error(rpc, "trying to write but not connected");
 171                 return -1;
 172         }
 173
 174         while ((pdu = rpc->outqueue.head) != NULL) {
 175                 int64_t total;
 176
 177                 total = pdu->outdata.size;
 178
 179                 count = send(rpc->fd, pdu->outdata.data + pdu->written, total - pdu->written, 0);
 180                 if (count == -1) {
 181                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 182                                 return 0;
 183                         }
 184                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 185                         return -1;
 186                 }
 187
 188                 pdu->written += count;
 189                 if (pdu->written == total) {
 190                         unsigned int hash;
 191
 192                         rpc->outqueue.head = pdu->next;
 193                         if (pdu->next == NULL)
 194                                 rpc->outqueue.tail = NULL;
 195
 196                         hash = rpc_hash_xid(pdu->xid);
 197                         rpc_enqueue(&rpc->waitpdu[hash], pdu);
 198                 }
 199         }
 200         return 0;
 201 }
 202
 203 static int rpc_read_from_socket(struct rpc_context *rpc)
 204 {
 205         int available;
 206         int size;
 207         int pdu_size;
 208         int32_t count;
 209
 210         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 211
 212         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 213                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 214                 return -1;
 215         }
 216
 217         if (available == 0) {
 218                 rpc_set_error(rpc, "Socket has been closed");
 219                 return -1;
 220         }
 221
 222         if (rpc->is_udp) {
 223                 char *buf;
 224                 socklen_t socklen = sizeof(rpc->udp_src);
 225
 226                 buf = malloc(available);
 227                 if (buf == NULL) {
 228                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 229                         return -1;
 230                 }
 231                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 232                 if (count < 0) {
 233                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 234                         free(buf);
 235                         return -1;
 236                 }
 237                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 238                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 239                         free(buf);
 240                         return -1;
 241                 }
 242                 free(buf);
 243                 return 0;
 244         }
 245
 246         /* read record marker, 4 bytes at the beginning of every pdu */
 247         if (rpc->inbuf == NULL) {
 248                 rpc->insize = 4;
 249                 rpc->inbuf = malloc(rpc->insize);
 250                 if (rpc->inbuf == NULL) {
 251                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 252                         return -1;
 253                 }
 254         }
 255         if (rpc->inpos < 4) {
 256                 size = 4 - rpc->inpos;
 257
 258                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 259                 if (count == -1) {
 260                         if (errno == EINTR) {
 261                                 return 0;
 262                         }
 263                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 264                         return -1;
 265                 }
 266                 available  -= count;
 267                 rpc->inpos += count;
 268         }
 269
 270         if (available == 0) {
 271                 return 0;
 272         }
 273
 274         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 275         if (rpc->insize < pdu_size) {
 276                 unsigned char *buf;
 277
 278                 buf = malloc(pdu_size);
 279                 if (buf == NULL) {
 280                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 281                         return -1;
 282                 }
 283                 memcpy(buf, rpc->inbuf, rpc->insize);
 284                 free(rpc->inbuf);
 285                 rpc->inbuf  = buf;
 286                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 287         }
 288
 289         size = available;
 290         if (size > rpc->insize - rpc->inpos) {
 291                 size = rpc->insize - rpc->inpos;
 292         }
 293
 294         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 295         if (count == -1) {
 296                 if (errno == EINTR) {
 297                         return 0;
 298                 }
 299                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 300                 return -1;
 301         }
 302         available  -= count;
 303         rpc->inpos += count;
 304
 305         if (rpc->inpos == rpc->insize) {
 306                 char *buf = rpc->inbuf;
 307
 308                 rpc->inbuf  = NULL;
 309                 rpc->insize = 0;
 310                 rpc->inpos  = 0;
 311
 312                 if (rpc_process_pdu(rpc, buf, pdu_size) != 0) {
 313                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 314                         return -1;
 315                 }
 316                 free(buf);
 317         }
 318
 319         return 0;
 320 }
 321
 322
 323
 324 int rpc_service(struct rpc_context *rpc, int revents)
 325 {
 326         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 327
 328         if (revents & POLLERR) {
 329 #ifdef WIN32
 330                 char err = 0;
 331 #else
 332                 int err = 0;
 333 #endif
 334                 socklen_t err_size = sizeof(err);
 335
 336                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 337                                 (char *)&err, &err_size) != 0 || err != 0) {
 338                         if (err == 0) {
 339                                 err = errno;
 340                         }
 341                         rpc_set_error(rpc, "rpc_service: socket error "
 342                                                "%s(%d).",
 343                                                strerror(err), err);
 344                 } else {
 345                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 346                                                 "Unknown socket error.");
 347                 }
 348                 if (rpc->connect_cb != NULL) {
 349                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 350                 }
 351                 return -1;
 352         }
 353         if (revents & POLLHUP) {
 354                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 355                 if (rpc->connect_cb != NULL) {
 356                         rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 357                 }
 358                 return -1;
 359         }
 360
 361         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 362                 int err = 0;
 363                 socklen_t err_size = sizeof(err);
 364
 365                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 366                                 (char *)&err, &err_size) != 0 || err != 0) {
 367                         if (err == 0) {
 368                                 err = errno;
 369                         }
 370                         rpc_set_error(rpc, "rpc_service: socket error "
 371                                         "%s(%d) while connecting.",
 372                                         strerror(err), err);
 373                         if (rpc->connect_cb != NULL) {
 374                                 rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 375                                         NULL, rpc->connect_data);
 376                         }
 377                         return -1;
 378                 }
 379
 380                 rpc->is_connected = 1;
 381                 if (rpc->connect_cb != NULL) {
 382                         rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 383                 }
 384                 return 0;
 385         }
 386
 387         if (revents & POLLIN) {
 388                 if (rpc_read_from_socket(rpc) != 0) {
 389                         rpc_reconnect_requeue(rpc);
 390                         return 0;
 391                 }
 392         }
 393
 394         if (revents & POLLOUT && rpc_has_queue(&rpc->outqueue)) {
 395                 if (rpc_write_to_socket(rpc) != 0) {
 396                         rpc_set_error(rpc, "write to socket failed");
 397                         return -1;
 398                 }
 399         }
 400
 401         return 0;
 402 }
 403
 404 void rpc_set_autoreconnect(struct rpc_context *rpc)
 405 {
 406         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 407
 408         rpc->auto_reconnect = 1;
 409 }
 410
 411 void rpc_unset_autoreconnect(struct rpc_context *rpc)
 412 {
 413         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 414
 415         rpc->auto_reconnect = 0;
 416 }
 417
 418 void rpc_set_tcp_syncnt(struct rpc_context *rpc, int v)
 419 {
 420         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 421
 422         rpc->tcp_syncnt = v;
 423 }
 424
 425 #ifndef TCP_SYNCNT
 426 #define TCP_SYNCNT        7
 427 #endif
 428
 429 static int rpc_connect_sockaddr_async(struct rpc_context *rpc, struct sockaddr_storage *s)
 430 {
 431         int socksize;
 432
 433         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 434
 435         switch (s->ss_family) {
 436         case AF_INET:
 437                 socksize = sizeof(struct sockaddr_in);
 438                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 439 #ifdef HAVE_NETINET_TCP_H
 440                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 441                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 442                 }
 443 #endif
 444                 break;
 445         case AF_INET6:
 446                 socksize = sizeof(struct sockaddr_in6);
 447                 rpc->fd = socket(AF_INET6, SOCK_STREAM, IPPROTO_TCP);
 448 #ifdef HAVE_NETINET_TCP_H
 449                 if (rpc->tcp_syncnt != RPC_PARAM_UNDEFINED) {
 450                         set_tcp_sockopt(rpc->fd, TCP_SYNCNT, rpc->tcp_syncnt);
 451                 }
 452 #endif
 453                 break;
 454         default:
 455                 rpc_set_error(rpc, "Can not handle AF_FAMILY:%d", s->ss_family);
 456                 return -1;
 457         }
 458
 459         if (rpc->fd == -1) {
 460                 rpc_set_error(rpc, "Failed to open socket");
 461                 return -1;
 462         }
 463
 464         /* Some systems allow you to set capabilities on an executable
 465          * to allow the file to be executed with privilege to bind to
 466          * privileged system ports, even if the user is not root.
 467          *
 468          * Opportunistically try to bind the socket to a low numbered
 469          * system port in the hope that the user is either root or the
 470          * executable has the CAP_NET_BIND_SERVICE.
 471          *
 472          * As soon as we fail the bind() with EACCES we know we will never
 473          * be able to bind to a system port so we terminate the loop.
 474          *
 475          * On linux, use
 476          *    sudo setcap 'cap_net_bind_service=+ep' /path/executable
 477          * to make the executable able to bind to a system port.
 478          *
 479          * On Windows, there is no concept of privileged ports. Thus
 480          * binding will usually succeed.
 481          */
 482         {
 483                 struct sockaddr_storage ss;
 484                 static int portOfs = 0;
 485                 const int firstPort = 512;      /* >= 512 according to Sun docs */
 486                 const int portCount = IPPORT_RESERVED - firstPort;
 487                 int startOfs, port, rc;
 488
 489                 if (portOfs == 0) {
 490                         portOfs = time(NULL) % 400;
 491                 }
 492                 startOfs = portOfs;
 493                 do {
 494                         rc = -1;
 495                         port = htons(firstPort + portOfs);
 496                         portOfs = (portOfs + 1) % portCount;
 497
 498                         /* skip well-known ports */
 499                         if (!getservbyport(port, "tcp")) {
 500                                 memset(&ss, 0, sizeof(ss));
 501
 502                                 switch (s->ss_family) {
 503                                 case AF_INET:
 504                                         ((struct sockaddr_in *)&ss)->sin_port = port;
 505                                         ((struct sockaddr_in *)&ss)->sin_family      = AF_INET;
 506 #ifdef HAVE_SOCKADDR_LEN
 507                                         ((struct sockaddr_in *)&ss)->sin_len = sizeof(struct sockaddr_in);
 508 #endif
 509                                         break;
 510                                 case AF_INET6:
 511                                         ((struct sockaddr_in6 *)&ss)->sin6_port = port;
 512                                         ((struct sockaddr_in6 *)&ss)->sin6_family      = AF_INET6;
 513 #ifdef HAVE_SOCKADDR_LEN
 514                                         ((struct sockaddr_in6 *)&ss)->sin6_len = sizeof(struct sockaddr_in6);
 515 #endif
 516                                         break;
 517                                 }
 518
 519                                 rc = bind(rpc->fd, (struct sockaddr *)&ss, socksize);
 520 #if !defined(WIN32)
 521                                 /* we got EACCES, so don't try again */
 522                                 if (rc != 0 && errno == EACCES)
 523                                         break;
 524 #endif
 525                         }
 526                 } while (rc != 0 && portOfs != startOfs);
 527         }
 528
 529         set_nonblocking(rpc->fd);
 530         set_nolinger(rpc->fd);
 531
 532         if (connect(rpc->fd, (struct sockaddr *)s, socksize) != 0 && errno != EINPROGRESS) {
 533                 rpc_set_error(rpc, "connect() to server failed. %s(%d)", strerror(errno), errno);
 534                 return -1;
 535         }
 536
 537         return 0;
 538 }
 539
 540 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 541 {
 542         struct addrinfo *ai = NULL;
 543
 544         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 545
 546         if (rpc->fd != -1) {
 547                 rpc_set_error(rpc, "Trying to connect while already connected");
 548                 return -1;
 549         }
 550
 551         if (rpc->is_udp != 0) {
 552                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 553                 return -1;
 554         }
 555
 556         rpc->auto_reconnect = 0;
 557
 558         if (getaddrinfo(server, NULL, NULL, &ai) != 0) {
 559                 rpc_set_error(rpc, "Invalid address:%s. "
 560                               "Can not resolv into IPv4/v6 structure.", server);
 561                 return -1;
 562         }
 563
 564         switch (ai->ai_family) {
 565         case AF_INET:
 566                 ((struct sockaddr_in *)&rpc->s)->sin_family = ai->ai_family;
 567                 ((struct sockaddr_in *)&rpc->s)->sin_port   = htons(port);
 568                 ((struct sockaddr_in *)&rpc->s)->sin_addr   = ((struct sockaddr_in *)(ai->ai_addr))->sin_addr;
 569 #ifdef HAVE_SOCKADDR_LEN
 570                 ((struct sockaddr_in *)&rpc->s)->sin_len = sizeof(struct sockaddr_in);
 571 #endif
 572                 break;
 573         case AF_INET6:
 574                 ((struct sockaddr_in6 *)&rpc->s)->sin6_family = ai->ai_family;
 575                 ((struct sockaddr_in6 *)&rpc->s)->sin6_port   = htons(port);
 576                 ((struct sockaddr_in6 *)&rpc->s)->sin6_addr   = ((struct sockaddr_in6 *)(ai->ai_addr))->sin6_addr;
 577 #ifdef HAVE_SOCKADDR_LEN
 578                 ((struct sockaddr_in6 *)&rpc->s)->sin6_len = sizeof(struct sockaddr_in6);
 579 #endif
 580                 break;
 581         }
 582
 583         rpc->connect_cb  = cb;
 584         rpc->connect_data = private_data;
 585
 586         freeaddrinfo(ai);
 587
 588         if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 589                 return -1;
 590         }
 591
 592         return 0;
 593 }
 594
 595 int rpc_disconnect(struct rpc_context *rpc, char *error)
 596 {
 597         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 598
 599         rpc_unset_autoreconnect(rpc);
 600
 601         if (rpc->fd != -1) {
 602                 close(rpc->fd);
 603         }
 604         rpc->fd  = -1;
 605
 606         rpc->is_connected = 0;
 607
 608         rpc_error_all_pdus(rpc, error);
 609
 610         return 0;
 611 }
 612
 613 static void reconnect_cb(struct rpc_context *rpc, int status, void *data _U_, void *private_data)
 614 {
 615         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 616
 617         if (status != RPC_STATUS_SUCCESS) {
 618                 rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 619                 return;
 620         }
 621
 622         rpc->is_connected = 1;
 623         rpc->connect_cb   = NULL;
 624 }
 625
 626 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue and reconnect */
 627 static int rpc_reconnect_requeue(struct rpc_context *rpc)
 628 {
 629         struct rpc_pdu *pdu;
 630         unsigned int i;
 631
 632         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 633
 634         if (rpc->fd != -1) {
 635                 close(rpc->fd);
 636         }
 637         rpc->fd  = -1;
 638
 639         rpc->is_connected = 0;
 640
 641         /* socket is closed so we will not get any replies to any commands
 642          * in flight. Move them all over from the waitpdu queue back to the out queue
 643          */
 644         for (i = 0; i < HASHES; i++) {
 645                 struct rpc_queue *q = &rpc->waitpdu[i];
 646
 647                 for (pdu=q->head; pdu; pdu=pdu->next) {
 648                         rpc_return_to_queue(&rpc->outqueue, pdu);
 649                         /* we have to re-send the whole pdu again */
 650                         pdu->written = 0;
 651                 }
 652                 rpc_reset_queue(q);
 653         }
 654
 655         if (rpc->auto_reconnect != 0) {
 656                 rpc->connect_cb  = reconnect_cb;
 657
 658                 if (rpc_connect_sockaddr_async(rpc, &rpc->s) != 0) {
 659                         rpc_error_all_pdus(rpc, "RPC ERROR: Failed to reconnect async");
 660                         return -1;
 661                 }
 662         }
 663
 664         return 0;
 665 }
 666
 667
 668 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 669 {
 670         struct addrinfo *ai = NULL;
 671         char service[6];
 672
 673         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 674
 675         if (rpc->is_udp == 0) {
 676                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 677                 return -1;
 678         }
 679
 680         sprintf(service, "%d", port);
 681         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 682                 rpc_set_error(rpc, "Invalid address:%s. "
 683                               "Can not resolv into IPv4/v6 structure.", addr);
 684                 return -1;
 685         }
 686
 687         switch(ai->ai_family) {
 688         case AF_INET:
 689                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 690                 if (rpc->fd == -1) {
 691                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 692                         freeaddrinfo(ai);
 693                         return -1;
 694                 }
 695
 696                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 697                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 698                         freeaddrinfo(ai);
 699                         return -1;
 700                 }
 701                 break;
 702         default:
 703                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 704                 freeaddrinfo(ai);
 705                 return -1;
 706         }
 707
 708         freeaddrinfo(ai);
 709
 710         return 0;
 711 }
 712
 713 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 714 {
 715         struct addrinfo *ai = NULL;
 716         char service[6];
 717
 718         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 719
 720         if (rpc->is_udp == 0) {
 721                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 722                 return -1;
 723         }
 724
 725         sprintf(service, "%d", port);
 726         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 727                 rpc_set_error(rpc, "Invalid address:%s. "
 728                               "Can not resolv into IPv4/v6 structure.", addr);
 729                 return -1;
 730         }
 731
 732         if (rpc->udp_dest) {
 733                 free(rpc->udp_dest);
 734                 rpc->udp_dest = NULL;
 735         }
 736         rpc->udp_dest = malloc(ai->ai_addrlen);
 737         if (rpc->udp_dest == NULL) {
 738                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 739                 freeaddrinfo(ai);
 740                 return -1;
 741         }
 742         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 743         freeaddrinfo(ai);
 744
 745         rpc->is_broadcast = is_broadcast;
 746         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 747
 748         return 0;
 749 }
 750
 751 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 752 {
 753         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 754
 755         return (struct sockaddr *)&rpc->udp_src;
 756 }
 757
 758 int rpc_queue_length(struct rpc_context *rpc)
 759 {
 760         int i=0;
 761         struct rpc_pdu *pdu;
 762         unsigned int n;
 763
 764         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 765
 766         for(pdu = rpc->outqueue.head; pdu; pdu = pdu->next) {
 767                 i++;
 768         }
 769
 770         for (n = 0; n < HASHES; n++) {
 771                 struct rpc_queue *q = &rpc->waitpdu[n];
 772
 773                 for(pdu = q->head; pdu; pdu = pdu->next)
 774                         i++;
 775         }
 776         return i;
 777 }
 778
 779 void rpc_set_fd(struct rpc_context *rpc, int fd)
 780 {
 781         assert(rpc->magic == RPC_CONTEXT_MAGIC);
 782
 783         rpc->fd = fd;
 784 }