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