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 WIN32
  18 #include "win32_compat.h"
  19 #else
  20 #include <unistd.h>
  21 #include <poll.h>
  22 #include <arpa/inet.h>
  23 #include <sys/ioctl.h>
  24 #include <sys/socket.h>
  25 #include <netdb.h>
  26 #endif/*WIN32*/
  27
  28 #if defined(WIN32)
  29 #include <winsock2.h>
  30 #include <ws2tcpip.h>
  31 #include <basetsd.h>
  32 #define ssize_t SSIZE_T
  33 #define MSG_DONTWAIT 0
  34 #else
  35 #include <unistd.h>
  36 #include <poll.h>
  37 #include <arpa/inet.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/socket.h>
  40 #include <netdb.h>
  41 #endif
  42
  43 #ifdef HAVE_CONFIG_H
  44 #include "config.h"
  45 #endif
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <fcntl.h>
  49 #include <string.h>
  50 #include <errno.h>
  51 #include <rpc/rpc.h>
  52 #include <rpc/xdr.h>
  53 #ifdef HAVE_SYS_FILIO_H
  54 #include <sys/filio.h>
  55 #endif
  56 #ifdef HAVE_SYS_SOCKIO_H
  57 #include <sys/sockio.h>
  58 #endif
  59 #include <sys/types.h>
  60 #include "libnfs.h"
  61 #include "libnfs-raw.h"
  62 #include "libnfs-private.h"
  63 #include "slist.h"
  64
  65 static int rpc_disconnect_requeue(struct rpc_context *rpc);
  66
  67 static void set_nonblocking(int fd)
  68 {
  69         int v = 0;
  70 #if defined(WIN32)
  71         long nonblocking=1;
  72         v = ioctlsocket(fd, FIONBIO,&nonblocking);
  73 #else
  74         v = fcntl(fd, F_GETFL, 0);
  75         fcntl(fd, F_SETFL, v | O_NONBLOCK);
  76 #endif //FIXME
  77 }
  78
  79 int rpc_get_fd(struct rpc_context *rpc)
  80 {
  81         return rpc->fd;
  82 }
  83
  84 int rpc_which_events(struct rpc_context *rpc)
  85 {
  86         int events = rpc->is_connected ? POLLIN : POLLOUT;
  87
  88         if (rpc->is_udp != 0) {
  89                 /* for udp sockets we only wait for pollin */
  90                 return POLLIN;
  91         }
  92
  93         if (rpc->outqueue) {
  94                 events |= POLLOUT;
  95         }
  96         return events;
  97 }
  98
  99 static int rpc_write_to_socket(struct rpc_context *rpc)
 100 {
 101         ssize_t count;
 102
 103         if (rpc == NULL) {
 104                 return -1;
 105         }
 106         if (rpc->fd == -1) {
 107                 rpc_set_error(rpc, "trying to write but not connected");
 108                 return -1;
 109         }
 110
 111         while (rpc->outqueue != NULL) {
 112                 ssize_t total;
 113
 114                 total = rpc->outqueue->outdata.size;
 115
 116 #if defined(WIN32)
 117                 count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0);
 118 #else
 119                 count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written);
 120 #endif
 121                 if (count == -1) {
 122                         if (errno == EAGAIN || errno == EWOULDBLOCK) {
 123                                 return 0;
 124                         }
 125                         rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno);
 126                         return -1;
 127                 }
 128
 129                 rpc->outqueue->written += count;
 130                 if (rpc->outqueue->written == total) {
 131                         struct rpc_pdu *pdu = rpc->outqueue;
 132
 133                         SLIST_REMOVE(&rpc->outqueue, pdu);
 134                         SLIST_ADD_END(&rpc->waitpdu, pdu);
 135                 }
 136         }
 137         return 0;
 138 }
 139
 140 static int rpc_read_from_socket(struct rpc_context *rpc)
 141 {
 142         int available;
 143         int size;
 144         int pdu_size;
 145         ssize_t count;
 146
 147 #if defined(WIN32)
 148         if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) {
 149 #else
 150         if (ioctl(rpc->fd, FIONREAD, &available) != 0) {
 151 #endif
 152                 rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno);
 153                 return -1;
 154         }
 155
 156         if (available == 0) {
 157                 rpc_set_error(rpc, "Socket has been closed");
 158                 return -1;
 159         }
 160
 161         if (rpc->is_udp) {
 162                 char *buf;
 163                 socklen_t socklen = sizeof(rpc->udp_src);
 164
 165                 buf = malloc(available);
 166                 if (buf == NULL) {
 167                         rpc_set_error(rpc, "Failed to malloc buffer for recvfrom");
 168                         return -1;
 169                 }
 170                 count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen);
 171                 if (count < 0) {
 172                         rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno));
 173                         free(buf);
 174                 }
 175                 if (rpc_process_pdu(rpc, buf, count) != 0) {
 176                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU");
 177                         free(buf);
 178                         return -1;
 179                 }
 180                 free(buf);
 181                 return 0;
 182         }
 183
 184         /* read record marker, 4 bytes at the beginning of every pdu */
 185         if (rpc->inbuf == NULL) {
 186                 rpc->insize = 4;
 187                 rpc->inbuf = malloc(rpc->insize);
 188                 if (rpc->inbuf == NULL) {
 189                         rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno);
 190                         return -1;
 191                 }
 192         }
 193         if (rpc->inpos < 4) {
 194                 size = 4 - rpc->inpos;
 195
 196 #if defined(WIN32)
 197                 count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 198 #else
 199                 count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
 200 #endif
 201                 if (count == -1) {
 202                         if (errno == EINTR) {
 203                                 return 0;
 204                         }
 205                         rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 206                         return -1;
 207                 }
 208                 available  -= count;
 209                 rpc->inpos += count;
 210         }
 211
 212         if (available == 0) {
 213                 return 0;
 214         }
 215
 216         pdu_size = rpc_get_pdu_size(rpc->inbuf);
 217         if (rpc->insize < pdu_size) {
 218                 unsigned char *buf;
 219
 220                 buf = malloc(pdu_size);
 221                 if (buf == NULL) {
 222                         rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno);
 223                         return -1;
 224                 }
 225                 memcpy(buf, rpc->inbuf, rpc->insize);
 226                 free(rpc->inbuf);
 227                 rpc->inbuf  = buf;
 228                 rpc->insize = rpc_get_pdu_size(rpc->inbuf);
 229         }
 230
 231         size = available;
 232         if (size > rpc->insize - rpc->inpos) {
 233                 size = rpc->insize - rpc->inpos;
 234         }
 235
 236 #if defined(WIN32)
 237         count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0);
 238 #else
 239         count = read(rpc->fd, rpc->inbuf + rpc->inpos, size);
 240 #endif
 241         if (count == -1) {
 242                 if (errno == EINTR) {
 243                         return 0;
 244                 }
 245                 rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno);
 246                 return -1;
 247         }
 248         available  -= count;
 249         rpc->inpos += count;
 250
 251         if (rpc->inpos == rpc->insize) {
 252                 if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) {
 253                         rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket");
 254                         return -1;
 255                 }
 256                 free(rpc->inbuf);
 257                 rpc->inbuf  = NULL;
 258                 rpc->insize = 0;
 259                 rpc->inpos  = 0;
 260         }
 261
 262         return 0;
 263 }
 264
 265
 266
 267 int rpc_service(struct rpc_context *rpc, int revents)
 268 {
 269         if (revents & POLLERR) {
 270                 char err = 0;
 271                 socklen_t err_size = sizeof(err);
 272
 273                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 274                                 (char *)&err, &err_size) != 0 || err != 0) {
 275                         if (err == 0) {
 276                                 err = errno;
 277                         }
 278                         rpc_set_error(rpc, "rpc_service: socket error "
 279                                                "%s(%d).",
 280                                                strerror(err), err);
 281                 } else {
 282                         rpc_set_error(rpc, "rpc_service: POLLERR, "
 283                                                 "Unknown socket error.");
 284                 }
 285                 rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 286                 return -1;
 287         }
 288         if (revents & POLLHUP) {
 289                 rpc_set_error(rpc, "Socket failed with POLLHUP");
 290                 rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data);
 291                 return -1;
 292         }
 293
 294         if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) {
 295                 int err = 0;
 296                 socklen_t err_size = sizeof(err);
 297
 298                 if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR,
 299                                 (char *)&err, &err_size) != 0 || err != 0) {
 300                         if (err == 0) {
 301                                 err = errno;
 302                         }
 303                         rpc_set_error(rpc, "rpc_service: socket error "
 304                                         "%s(%d) while connecting.",
 305                                         strerror(err), err);
 306                         rpc->connect_cb(rpc, RPC_STATUS_ERROR,
 307                                         NULL, rpc->connect_data);
 308                         return -1;
 309                 }
 310
 311                 rpc->is_connected = 1;
 312                 rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data);
 313                 return 0;
 314         }
 315
 316         if (revents & POLLIN) {
 317                 if (rpc_read_from_socket(rpc) != 0) {
 318                         rpc_disconnect_requeue(rpc);
 319                         return 0;
 320                 }
 321         }
 322
 323         if (revents & POLLOUT && rpc->outqueue != NULL) {
 324                 if (rpc_write_to_socket(rpc) != 0) {
 325                         rpc_set_error(rpc, "write to socket failed");
 326                         return -1;
 327                 }
 328         }
 329
 330         return 0;
 331 }
 332
 333
 334 int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data)
 335 {
 336         struct sockaddr_storage s;
 337         struct sockaddr_in *sin = (struct sockaddr_in *)&s;
 338         int socksize;
 339
 340         if (rpc->fd != -1) {
 341                 rpc_set_error(rpc, "Trying to connect while already connected");
 342                 return -1;
 343         }
 344
 345         if (rpc->is_udp != 0) {
 346                 rpc_set_error(rpc, "Trying to connect on UDP socket");
 347                 return -1;
 348         }
 349
 350         sin->sin_family = AF_INET;
 351         sin->sin_port   = htons(port);
 352         if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) {
 353                 rpc_set_error(rpc, "Not a valid server ip address");
 354                 return -1;
 355         }
 356
 357         switch (s.ss_family) {
 358         case AF_INET:
 359                 socksize = sizeof(struct sockaddr_in);
 360 #ifdef HAVE_SOCKADDR_LEN
 361                 sin->sin_len = socksize;
 362 #endif
 363                 rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
 364                 break;
 365         }
 366
 367         if (rpc->fd == -1) {
 368                 rpc_set_error(rpc, "Failed to open socket");
 369                 return -1;
 370         }
 371
 372         rpc->connect_cb  = cb;
 373         rpc->connect_data = private_data;
 374
 375         set_nonblocking(rpc->fd);
 376 #if defined(WIN32)
 377         if (connect(rpc->fd, (struct sockaddr *)&s, socksize) == 0 && GetLastError() != WSAEINPROGRESS   )
 378 #else
 379         if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS)
 380 #endif
 381         {
 382                 rpc_set_error(rpc, "connect() to server failed");
 383                 return -1;
 384         }
 385
 386         return 0;
 387 }
 388
 389 int rpc_disconnect(struct rpc_context *rpc, char *error)
 390 {
 391         if (rpc->fd != -1) {
 392 #if defined(WIN32)
 393                 closesocket(rpc->fd);
 394 #else
 395                 close(rpc->fd);
 396 #endif
 397         }
 398         rpc->fd  = -1;
 399
 400         rpc->is_connected = 0;
 401
 402         rpc_error_all_pdus(rpc, error);
 403
 404         return 0;
 405 }
 406
 407 /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */
 408 static int rpc_disconnect_requeue(struct rpc_context *rpc)
 409 {
 410         struct rpc_pdu *pdu;
 411
 412         if (rpc->fd != -1) {
 413 #if defined(WIN32)
 414                 closesocket(rpc->fd);
 415 #else
 416                 close(rpc->fd);
 417 #endif
 418         }
 419         rpc->fd  = -1;
 420
 421         rpc->is_connected = 0;
 422
 423         /* socket is closed so we will not get any replies to any commands
 424          * in flight. Move them all over from the waitpdu queue back to the out queue
 425          */
 426         for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) {
 427                 SLIST_REMOVE(&rpc->waitpdu, pdu);
 428                 SLIST_ADD(&rpc->outqueue, pdu);
 429         }
 430
 431         return 0;
 432 }
 433
 434
 435 int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port)
 436 {
 437         struct addrinfo *ai = NULL;
 438         char service[6];
 439
 440         if (rpc->is_udp == 0) {
 441                 rpc_set_error(rpc, "Cant not bind UDP. Not UDP context");
 442                 return -1;
 443         }
 444
 445         sprintf(service, "%d", port);
 446         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 447                 rpc_set_error(rpc, "Invalid address:%s. "
 448                         "Can not resolv into IPv4/v6 structure.");
 449                 return -1;
 450         }
 451
 452         switch(ai->ai_family) {
 453         case AF_INET:
 454                 rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0);
 455                 if (rpc->fd == -1) {
 456                         rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno));
 457                         freeaddrinfo(ai);
 458                         return -1;
 459                 }
 460
 461                 if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) {
 462                         rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno));
 463                         freeaddrinfo(ai);
 464                         return -1;
 465                 }
 466                 break;
 467         default:
 468                 rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family);
 469                 freeaddrinfo(ai);
 470                 return -1;
 471         }
 472
 473         freeaddrinfo(ai);
 474
 475         return 0;
 476 }
 477
 478 int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast)
 479 {
 480         struct addrinfo *ai = NULL;
 481         char service[6];
 482
 483         if (rpc->is_udp == 0) {
 484                 rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context");
 485                 return -1;
 486         }
 487
 488         sprintf(service, "%d", port);
 489         if (getaddrinfo(addr, service, NULL, &ai) != 0) {
 490                 rpc_set_error(rpc, "Invalid address:%s. "
 491                         "Can not resolv into IPv4/v6 structure.");
 492                 return -1;
 493         }
 494
 495         if (rpc->udp_dest) {
 496                 free(rpc->udp_dest);
 497                 rpc->udp_dest = NULL;
 498         }
 499         rpc->udp_dest = malloc(ai->ai_addrlen);
 500         if (rpc->udp_dest == NULL) {
 501                 rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure");
 502                 return -1;
 503         }
 504         memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen);
 505         freeaddrinfo(ai);
 506
 507         rpc->is_broadcast = is_broadcast;
 508         setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast));
 509
 510         return 0;
 511 }
 512
 513 struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc)
 514 {
 515         return (struct sockaddr *)&rpc->udp_src;
 516 }
 517
 518 int rpc_queue_length(struct rpc_context *rpc)
 519 {
 520         int i=0;
 521         struct rpc_pdu *pdu;
 522
 523         for(pdu = rpc->outqueue; pdu; pdu = pdu->next) {
 524                 i++;
 525         }
 526         for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) {
 527                 i++;
 528         }
 529         return i;
 530 }