| 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 | #ifdef HAVE_CONFIG_H |
| 29 | #include "config.h" |
| 30 | #endif |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <fcntl.h> |
| 34 | #include <string.h> |
| 35 | #include <errno.h> |
| 36 | #include <rpc/rpc.h> |
| 37 | #include <rpc/xdr.h> |
| 38 | #ifdef HAVE_SYS_FILIO_H |
| 39 | #include <sys/filio.h> |
| 40 | #endif |
| 41 | #ifdef HAVE_SYS_SOCKIO_H |
| 42 | #include <sys/sockio.h> |
| 43 | #endif |
| 44 | #include <sys/types.h> |
| 45 | #include "libnfs.h" |
| 46 | #include "libnfs-raw.h" |
| 47 | #include "libnfs-private.h" |
| 48 | #include "slist.h" |
| 49 | |
| 50 | #ifdef WIN32 |
| 51 | //has to be included after stdlib!! |
| 52 | #include "win32_errnowrapper.h" |
| 53 | #endif |
| 54 | |
| 55 | |
| 56 | static int rpc_disconnect_requeue(struct rpc_context *rpc); |
| 57 | |
| 58 | static void set_nonblocking(int fd) |
| 59 | { |
| 60 | int v = 0; |
| 61 | #if defined(WIN32) |
| 62 | long nonblocking=1; |
| 63 | v = ioctlsocket(fd, FIONBIO,&nonblocking); |
| 64 | #else |
| 65 | v = fcntl(fd, F_GETFL, 0); |
| 66 | fcntl(fd, F_SETFL, v | O_NONBLOCK); |
| 67 | #endif //FIXME |
| 68 | } |
| 69 | |
| 70 | int rpc_get_fd(struct rpc_context *rpc) |
| 71 | { |
| 72 | return rpc->fd; |
| 73 | } |
| 74 | |
| 75 | int rpc_which_events(struct rpc_context *rpc) |
| 76 | { |
| 77 | int events = rpc->is_connected ? POLLIN : POLLOUT; |
| 78 | |
| 79 | if (rpc->is_udp != 0) { |
| 80 | /* for udp sockets we only wait for pollin */ |
| 81 | return POLLIN; |
| 82 | } |
| 83 | |
| 84 | if (rpc->outqueue) { |
| 85 | events |= POLLOUT; |
| 86 | } |
| 87 | return events; |
| 88 | } |
| 89 | |
| 90 | static int rpc_write_to_socket(struct rpc_context *rpc) |
| 91 | { |
| 92 | ssize_t count; |
| 93 | |
| 94 | if (rpc == NULL) { |
| 95 | return -1; |
| 96 | } |
| 97 | if (rpc->fd == -1) { |
| 98 | rpc_set_error(rpc, "trying to write but not connected"); |
| 99 | return -1; |
| 100 | } |
| 101 | |
| 102 | while (rpc->outqueue != NULL) { |
| 103 | ssize_t total; |
| 104 | |
| 105 | total = rpc->outqueue->outdata.size; |
| 106 | |
| 107 | #if defined(WIN32) |
| 108 | count = send(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written, 0); |
| 109 | #else |
| 110 | count = write(rpc->fd, rpc->outqueue->outdata.data + rpc->outqueue->written, total - rpc->outqueue->written); |
| 111 | #endif |
| 112 | if (count == -1) { |
| 113 | if (errno == EAGAIN || errno == EWOULDBLOCK) { |
| 114 | return 0; |
| 115 | } |
| 116 | rpc_set_error(rpc, "Error when writing to socket :%s(%d)", strerror(errno), errno); |
| 117 | return -1; |
| 118 | } |
| 119 | |
| 120 | rpc->outqueue->written += count; |
| 121 | if (rpc->outqueue->written == total) { |
| 122 | struct rpc_pdu *pdu = rpc->outqueue; |
| 123 | |
| 124 | SLIST_REMOVE(&rpc->outqueue, pdu); |
| 125 | SLIST_ADD_END(&rpc->waitpdu, pdu); |
| 126 | } |
| 127 | } |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static int rpc_read_from_socket(struct rpc_context *rpc) |
| 132 | { |
| 133 | int available; |
| 134 | int size; |
| 135 | int pdu_size; |
| 136 | ssize_t count; |
| 137 | |
| 138 | #if defined(WIN32) |
| 139 | if (ioctlsocket(rpc->fd, FIONREAD, &available) != 0) { |
| 140 | #else |
| 141 | if (ioctl(rpc->fd, FIONREAD, &available) != 0) { |
| 142 | #endif |
| 143 | rpc_set_error(rpc, "Ioctl FIONREAD returned error : %d. Closing socket.", errno); |
| 144 | return -1; |
| 145 | } |
| 146 | |
| 147 | if (available == 0) { |
| 148 | rpc_set_error(rpc, "Socket has been closed"); |
| 149 | return -1; |
| 150 | } |
| 151 | |
| 152 | if (rpc->is_udp) { |
| 153 | char *buf; |
| 154 | socklen_t socklen = sizeof(rpc->udp_src); |
| 155 | |
| 156 | buf = malloc(available); |
| 157 | if (buf == NULL) { |
| 158 | rpc_set_error(rpc, "Failed to malloc buffer for recvfrom"); |
| 159 | return -1; |
| 160 | } |
| 161 | count = recvfrom(rpc->fd, buf, available, MSG_DONTWAIT, (struct sockaddr *)&rpc->udp_src, &socklen); |
| 162 | if (count < 0) { |
| 163 | rpc_set_error(rpc, "Failed recvfrom: %s", strerror(errno)); |
| 164 | free(buf); |
| 165 | } |
| 166 | if (rpc_process_pdu(rpc, buf, count) != 0) { |
| 167 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Ignoring PDU"); |
| 168 | free(buf); |
| 169 | return -1; |
| 170 | } |
| 171 | free(buf); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | /* read record marker, 4 bytes at the beginning of every pdu */ |
| 176 | if (rpc->inbuf == NULL) { |
| 177 | rpc->insize = 4; |
| 178 | rpc->inbuf = malloc(rpc->insize); |
| 179 | if (rpc->inbuf == NULL) { |
| 180 | rpc_set_error(rpc, "Failed to allocate buffer for record marker, errno:%d. Closing socket.", errno); |
| 181 | return -1; |
| 182 | } |
| 183 | } |
| 184 | if (rpc->inpos < 4) { |
| 185 | size = 4 - rpc->inpos; |
| 186 | |
| 187 | #if defined(WIN32) |
| 188 | count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0); |
| 189 | #else |
| 190 | count = read(rpc->fd, rpc->inbuf + rpc->inpos, size); |
| 191 | #endif |
| 192 | if (count == -1) { |
| 193 | if (errno == EINTR) { |
| 194 | return 0; |
| 195 | } |
| 196 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); |
| 197 | return -1; |
| 198 | } |
| 199 | available -= count; |
| 200 | rpc->inpos += count; |
| 201 | } |
| 202 | |
| 203 | if (available == 0) { |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | pdu_size = rpc_get_pdu_size(rpc->inbuf); |
| 208 | if (rpc->insize < pdu_size) { |
| 209 | unsigned char *buf; |
| 210 | |
| 211 | buf = malloc(pdu_size); |
| 212 | if (buf == NULL) { |
| 213 | rpc_set_error(rpc, "Failed to allocate buffer of %d bytes for pdu, errno:%d. Closing socket.", pdu_size, errno); |
| 214 | return -1; |
| 215 | } |
| 216 | memcpy(buf, rpc->inbuf, rpc->insize); |
| 217 | free(rpc->inbuf); |
| 218 | rpc->inbuf = buf; |
| 219 | rpc->insize = rpc_get_pdu_size(rpc->inbuf); |
| 220 | } |
| 221 | |
| 222 | size = available; |
| 223 | if (size > rpc->insize - rpc->inpos) { |
| 224 | size = rpc->insize - rpc->inpos; |
| 225 | } |
| 226 | |
| 227 | #if defined(WIN32) |
| 228 | count = recv(rpc->fd, rpc->inbuf + rpc->inpos, size, 0); |
| 229 | #else |
| 230 | count = read(rpc->fd, rpc->inbuf + rpc->inpos, size); |
| 231 | #endif |
| 232 | if (count == -1) { |
| 233 | if (errno == EINTR) { |
| 234 | return 0; |
| 235 | } |
| 236 | rpc_set_error(rpc, "Read from socket failed, errno:%d. Closing socket.", errno); |
| 237 | return -1; |
| 238 | } |
| 239 | available -= count; |
| 240 | rpc->inpos += count; |
| 241 | |
| 242 | if (rpc->inpos == rpc->insize) { |
| 243 | if (rpc_process_pdu(rpc, rpc->inbuf, pdu_size) != 0) { |
| 244 | rpc_set_error(rpc, "Invalid/garbage pdu received from server. Closing socket"); |
| 245 | return -1; |
| 246 | } |
| 247 | free(rpc->inbuf); |
| 248 | rpc->inbuf = NULL; |
| 249 | rpc->insize = 0; |
| 250 | rpc->inpos = 0; |
| 251 | } |
| 252 | |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | |
| 257 | |
| 258 | int rpc_service(struct rpc_context *rpc, int revents) |
| 259 | { |
| 260 | if (revents & POLLERR) { |
| 261 | #ifdef WIN32 |
| 262 | char err = 0; |
| 263 | #else |
| 264 | int err = 0; |
| 265 | #endif |
| 266 | socklen_t err_size = sizeof(err); |
| 267 | |
| 268 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, |
| 269 | (char *)&err, &err_size) != 0 || err != 0) { |
| 270 | if (err == 0) { |
| 271 | err = errno; |
| 272 | } |
| 273 | rpc_set_error(rpc, "rpc_service: socket error " |
| 274 | "%s(%d).", |
| 275 | strerror(err), err); |
| 276 | } else { |
| 277 | rpc_set_error(rpc, "rpc_service: POLLERR, " |
| 278 | "Unknown socket error."); |
| 279 | } |
| 280 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); |
| 281 | return -1; |
| 282 | } |
| 283 | if (revents & POLLHUP) { |
| 284 | rpc_set_error(rpc, "Socket failed with POLLHUP"); |
| 285 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, rpc->error_string, rpc->connect_data); |
| 286 | return -1; |
| 287 | } |
| 288 | |
| 289 | if (rpc->is_connected == 0 && rpc->fd != -1 && revents&POLLOUT) { |
| 290 | int err = 0; |
| 291 | socklen_t err_size = sizeof(err); |
| 292 | |
| 293 | if (getsockopt(rpc->fd, SOL_SOCKET, SO_ERROR, |
| 294 | (char *)&err, &err_size) != 0 || err != 0) { |
| 295 | if (err == 0) { |
| 296 | err = errno; |
| 297 | } |
| 298 | rpc_set_error(rpc, "rpc_service: socket error " |
| 299 | "%s(%d) while connecting.", |
| 300 | strerror(err), err); |
| 301 | rpc->connect_cb(rpc, RPC_STATUS_ERROR, |
| 302 | NULL, rpc->connect_data); |
| 303 | return -1; |
| 304 | } |
| 305 | |
| 306 | rpc->is_connected = 1; |
| 307 | rpc->connect_cb(rpc, RPC_STATUS_SUCCESS, NULL, rpc->connect_data); |
| 308 | return 0; |
| 309 | } |
| 310 | |
| 311 | if (revents & POLLIN) { |
| 312 | if (rpc_read_from_socket(rpc) != 0) { |
| 313 | rpc_disconnect_requeue(rpc); |
| 314 | return 0; |
| 315 | } |
| 316 | } |
| 317 | |
| 318 | if (revents & POLLOUT && rpc->outqueue != NULL) { |
| 319 | if (rpc_write_to_socket(rpc) != 0) { |
| 320 | rpc_set_error(rpc, "write to socket failed"); |
| 321 | return -1; |
| 322 | } |
| 323 | } |
| 324 | |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | int rpc_connect_async(struct rpc_context *rpc, const char *server, int port, rpc_cb cb, void *private_data) |
| 329 | { |
| 330 | struct sockaddr_storage s; |
| 331 | struct sockaddr_in *sin = (struct sockaddr_in *)&s; |
| 332 | int socksize; |
| 333 | |
| 334 | if (rpc->fd != -1) { |
| 335 | rpc_set_error(rpc, "Trying to connect while already connected"); |
| 336 | return -1; |
| 337 | } |
| 338 | |
| 339 | if (rpc->is_udp != 0) { |
| 340 | rpc_set_error(rpc, "Trying to connect on UDP socket"); |
| 341 | return -1; |
| 342 | } |
| 343 | |
| 344 | sin->sin_family = AF_INET; |
| 345 | sin->sin_port = htons(port); |
| 346 | if (inet_pton(AF_INET, server, &sin->sin_addr) != 1) { |
| 347 | rpc_set_error(rpc, "Not a valid server ip address"); |
| 348 | return -1; |
| 349 | } |
| 350 | |
| 351 | switch (s.ss_family) { |
| 352 | case AF_INET: |
| 353 | socksize = sizeof(struct sockaddr_in); |
| 354 | #ifdef HAVE_SOCKADDR_LEN |
| 355 | sin->sin_len = socksize; |
| 356 | #endif |
| 357 | rpc->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); |
| 358 | break; |
| 359 | } |
| 360 | |
| 361 | if (rpc->fd == -1) { |
| 362 | rpc_set_error(rpc, "Failed to open socket"); |
| 363 | return -1; |
| 364 | } |
| 365 | |
| 366 | rpc->connect_cb = cb; |
| 367 | rpc->connect_data = private_data; |
| 368 | |
| 369 | |
| 370 | #if !defined(WIN32) |
| 371 | /* Some systems allow you to set capabilities on an executable |
| 372 | * to allow the file to be executed with privilege to bind to |
| 373 | * privileged system ports, even if the user is not root. |
| 374 | * |
| 375 | * Opportunistically try to bind the socket to a low numbered |
| 376 | * system port in the hope that the user is either root or the |
| 377 | * executable has the CAP_NET_BIND_SERVICE. |
| 378 | * |
| 379 | * As soon as we fail the bind() with EACCES we know we will never |
| 380 | * be able to bind to a system port so we terminate the loop. |
| 381 | * |
| 382 | * On linux, use |
| 383 | * sudo setcap 'cap_net_bind_service=+ep' /path/executable |
| 384 | * to make the executable able to bind to a system port. |
| 385 | */ |
| 386 | if (1) { |
| 387 | int port; |
| 388 | int one = 1; |
| 389 | |
| 390 | setsockopt(rpc->fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)); |
| 391 | |
| 392 | for (port = 200; port < 500; port++) { |
| 393 | struct sockaddr_in sin; |
| 394 | |
| 395 | memset(&sin, 0, sizeof(sin)); |
| 396 | sin.sin_port = htons(port); |
| 397 | sin.sin_family = AF_INET; |
| 398 | sin.sin_addr.s_addr = 0; |
| 399 | |
| 400 | if (bind(rpc->fd, (struct sockaddr *)&sin, sizeof(struct sockaddr_in)) != 0 && errno != EACCES) { |
| 401 | /* we didnt get EACCES, so try again */ |
| 402 | continue; |
| 403 | } |
| 404 | break; |
| 405 | } |
| 406 | } |
| 407 | #endif |
| 408 | |
| 409 | set_nonblocking(rpc->fd); |
| 410 | |
| 411 | #if defined(WIN32) |
| 412 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) == 0 && errno != EINPROGRESS ) |
| 413 | #else |
| 414 | if (connect(rpc->fd, (struct sockaddr *)&s, socksize) != 0 && errno != EINPROGRESS) |
| 415 | #endif |
| 416 | { |
| 417 | rpc_set_error(rpc, "connect() to server failed"); |
| 418 | return -1; |
| 419 | } |
| 420 | |
| 421 | return 0; |
| 422 | } |
| 423 | |
| 424 | int rpc_disconnect(struct rpc_context *rpc, char *error) |
| 425 | { |
| 426 | if (rpc->fd != -1) { |
| 427 | #if defined(WIN32) |
| 428 | closesocket(rpc->fd); |
| 429 | #else |
| 430 | close(rpc->fd); |
| 431 | #endif |
| 432 | } |
| 433 | rpc->fd = -1; |
| 434 | |
| 435 | rpc->is_connected = 0; |
| 436 | |
| 437 | rpc_error_all_pdus(rpc, error); |
| 438 | |
| 439 | return 0; |
| 440 | } |
| 441 | |
| 442 | /* disconnect but do not error all PDUs, just move pdus in-flight back to the outqueue */ |
| 443 | static int rpc_disconnect_requeue(struct rpc_context *rpc) |
| 444 | { |
| 445 | struct rpc_pdu *pdu; |
| 446 | |
| 447 | if (rpc->fd != -1) { |
| 448 | #if defined(WIN32) |
| 449 | closesocket(rpc->fd); |
| 450 | #else |
| 451 | close(rpc->fd); |
| 452 | #endif |
| 453 | } |
| 454 | rpc->fd = -1; |
| 455 | |
| 456 | rpc->is_connected = 0; |
| 457 | |
| 458 | /* socket is closed so we will not get any replies to any commands |
| 459 | * in flight. Move them all over from the waitpdu queue back to the out queue |
| 460 | */ |
| 461 | for (pdu=rpc->waitpdu; pdu; pdu=pdu->next) { |
| 462 | SLIST_REMOVE(&rpc->waitpdu, pdu); |
| 463 | SLIST_ADD(&rpc->outqueue, pdu); |
| 464 | } |
| 465 | |
| 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | |
| 470 | int rpc_bind_udp(struct rpc_context *rpc, char *addr, int port) |
| 471 | { |
| 472 | struct addrinfo *ai = NULL; |
| 473 | char service[6]; |
| 474 | |
| 475 | if (rpc->is_udp == 0) { |
| 476 | rpc_set_error(rpc, "Cant not bind UDP. Not UDP context"); |
| 477 | return -1; |
| 478 | } |
| 479 | |
| 480 | sprintf(service, "%d", port); |
| 481 | if (getaddrinfo(addr, service, NULL, &ai) != 0) { |
| 482 | rpc_set_error(rpc, "Invalid address:%s. " |
| 483 | "Can not resolv into IPv4/v6 structure."); |
| 484 | return -1; |
| 485 | } |
| 486 | |
| 487 | switch(ai->ai_family) { |
| 488 | case AF_INET: |
| 489 | rpc->fd = socket(ai->ai_family, SOCK_DGRAM, 0); |
| 490 | if (rpc->fd == -1) { |
| 491 | rpc_set_error(rpc, "Failed to create UDP socket: %s", strerror(errno)); |
| 492 | freeaddrinfo(ai); |
| 493 | return -1; |
| 494 | } |
| 495 | |
| 496 | if (bind(rpc->fd, (struct sockaddr *)ai->ai_addr, sizeof(struct sockaddr_in)) != 0) { |
| 497 | rpc_set_error(rpc, "Failed to bind to UDP socket: %s",strerror(errno)); |
| 498 | freeaddrinfo(ai); |
| 499 | return -1; |
| 500 | } |
| 501 | break; |
| 502 | default: |
| 503 | rpc_set_error(rpc, "Can not handle UPD sockets of family %d yet", ai->ai_family); |
| 504 | freeaddrinfo(ai); |
| 505 | return -1; |
| 506 | } |
| 507 | |
| 508 | freeaddrinfo(ai); |
| 509 | |
| 510 | return 0; |
| 511 | } |
| 512 | |
| 513 | int rpc_set_udp_destination(struct rpc_context *rpc, char *addr, int port, int is_broadcast) |
| 514 | { |
| 515 | struct addrinfo *ai = NULL; |
| 516 | char service[6]; |
| 517 | |
| 518 | if (rpc->is_udp == 0) { |
| 519 | rpc_set_error(rpc, "Can not set destination sockaddr. Not UDP context"); |
| 520 | return -1; |
| 521 | } |
| 522 | |
| 523 | sprintf(service, "%d", port); |
| 524 | if (getaddrinfo(addr, service, NULL, &ai) != 0) { |
| 525 | rpc_set_error(rpc, "Invalid address:%s. " |
| 526 | "Can not resolv into IPv4/v6 structure."); |
| 527 | return -1; |
| 528 | } |
| 529 | |
| 530 | if (rpc->udp_dest) { |
| 531 | free(rpc->udp_dest); |
| 532 | rpc->udp_dest = NULL; |
| 533 | } |
| 534 | rpc->udp_dest = malloc(ai->ai_addrlen); |
| 535 | if (rpc->udp_dest == NULL) { |
| 536 | rpc_set_error(rpc, "Out of memory. Failed to allocate sockaddr structure"); |
| 537 | return -1; |
| 538 | } |
| 539 | memcpy(rpc->udp_dest, ai->ai_addr, ai->ai_addrlen); |
| 540 | freeaddrinfo(ai); |
| 541 | |
| 542 | rpc->is_broadcast = is_broadcast; |
| 543 | setsockopt(rpc->fd, SOL_SOCKET, SO_BROADCAST, (char *)&is_broadcast, sizeof(is_broadcast)); |
| 544 | |
| 545 | return 0; |
| 546 | } |
| 547 | |
| 548 | struct sockaddr *rpc_get_recv_sockaddr(struct rpc_context *rpc) |
| 549 | { |
| 550 | return (struct sockaddr *)&rpc->udp_src; |
| 551 | } |
| 552 | |
| 553 | int rpc_queue_length(struct rpc_context *rpc) |
| 554 | { |
| 555 | int i=0; |
| 556 | struct rpc_pdu *pdu; |
| 557 | |
| 558 | for(pdu = rpc->outqueue; pdu; pdu = pdu->next) { |
| 559 | i++; |
| 560 | } |
| 561 | for(pdu = rpc->waitpdu; pdu; pdu = pdu->next) { |
| 562 | i++; |
| 563 | } |
| 564 | return i; |
| 565 | } |