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