1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31#include <sys/param.h> 32#include <sys/bio.h> 33#include <sys/disk.h> 34#include <sys/endian.h> 35#include <sys/ioctl.h> 36#include <sys/queue.h> 37#include <sys/socket.h> 38#include <sys/stat.h> 39#include <sys/time.h> 40#include <arpa/inet.h> 41#include <netinet/in.h> 42#include <netinet/tcp.h> 43#include <assert.h> 44#include <err.h> 45#include <errno.h> 46#include <inttypes.h> 47#include <fcntl.h> 48#include <libgen.h> 49#include <libutil.h> 50#include <paths.h> 51#include <pthread.h> 52#include <signal.h> 53#include <stdarg.h> 54#include <stdio.h> 55#include <stdlib.h> 56#include <stdint.h> 57#include <string.h> 58#include <syslog.h> 59#include <unistd.h> 60 61#include "ggate.h" 62 63 64#define GGATED_EXPORT_FILE "/etc/gg.exports" 65 66struct ggd_connection { 67 off_t c_mediasize; 68 unsigned c_sectorsize; 69 unsigned c_flags; /* flags (RO/RW) */ 70 int c_diskfd; 71 int c_sendfd; 72 int c_recvfd; 73 time_t c_birthtime; 74 char *c_path; 75 uint64_t c_token; 76 in_addr_t c_srcip; 77 LIST_ENTRY(ggd_connection) c_next; 78}; 79 80struct ggd_request { 81 struct g_gate_hdr r_hdr; 82 char *r_data; 83 TAILQ_ENTRY(ggd_request) r_next; 84}; 85#define r_cmd r_hdr.gh_cmd 86#define r_offset r_hdr.gh_offset 87#define r_length r_hdr.gh_length 88#define r_error r_hdr.gh_error 89 90struct ggd_export { 91 char *e_path; /* path to device/file */ 92 in_addr_t e_ip; /* remote IP address */ 93 in_addr_t e_mask; /* IP mask */ 94 unsigned e_flags; /* flags (RO/RW) */ 95 SLIST_ENTRY(ggd_export) e_next; 96}; 97 98static const char *exports_file = GGATED_EXPORT_FILE; 99static int got_sighup = 0; 100static in_addr_t bindaddr; 101 102static TAILQ_HEAD(, ggd_request) inqueue = TAILQ_HEAD_INITIALIZER(inqueue); 103static TAILQ_HEAD(, ggd_request) outqueue = TAILQ_HEAD_INITIALIZER(outqueue); 104static pthread_mutex_t inqueue_mtx, outqueue_mtx; 105static pthread_cond_t inqueue_cond, outqueue_cond; 106 107static SLIST_HEAD(, ggd_export) exports = SLIST_HEAD_INITIALIZER(exports); 108static LIST_HEAD(, ggd_connection) connections = LIST_HEAD_INITIALIZER(connections); 109 110static void *recv_thread(void *arg); 111static void *disk_thread(void *arg); 112static void *send_thread(void *arg); 113 114static void 115usage(void) 116{ 117 118 fprintf(stderr, "usage: %s [-nv] [-a address] [-F pidfile] [-p port] " 119 "[-R rcvbuf] [-S sndbuf] [exports file]\n", getprogname()); 120 exit(EXIT_FAILURE); 121} 122 123static char * 124ip2str(in_addr_t ip) 125{ 126 static char sip[16]; 127 128 snprintf(sip, sizeof(sip), "%u.%u.%u.%u", 129 ((ip >> 24) & 0xff), 130 ((ip >> 16) & 0xff), 131 ((ip >> 8) & 0xff), 132 (ip & 0xff)); 133 return (sip); 134} 135 136static in_addr_t 137countmask(unsigned m) 138{ 139 in_addr_t mask; 140 141 if (m == 0) { 142 mask = 0x0; 143 } else { 144 mask = 1 << (32 - m); 145 mask--; 146 mask = ~mask; 147 } 148 return (mask); 149} 150 151static void 152line_parse(char *line, unsigned lineno) 153{ 154 struct ggd_export *ex; 155 char *word, *path, *sflags; 156 unsigned flags, i, vmask; 157 in_addr_t ip, mask; 158 159 ip = mask = flags = vmask = 0; 160 path = NULL; 161 sflags = NULL; 162 163 for (i = 0, word = strtok(line, " \t"); word != NULL; 164 i++, word = strtok(NULL, " \t")) { 165 switch (i) { 166 case 0: /* IP address or host name */ 167 ip = g_gate_str2ip(strsep(&word, "/")); 168 if (ip == INADDR_NONE) { 169 g_gate_xlog("Invalid IP/host name at line %u.", 170 lineno); 171 } 172 ip = ntohl(ip); 173 if (word == NULL) 174 vmask = 32; 175 else { 176 errno = 0; 177 vmask = strtoul(word, NULL, 10); 178 if (vmask == 0 && errno != 0) { 179 g_gate_xlog("Invalid IP mask value at " 180 "line %u.", lineno); 181 } 182 if ((unsigned)vmask > 32) { 183 g_gate_xlog("Invalid IP mask value at line %u.", 184 lineno); 185 } 186 } 187 mask = countmask(vmask); 188 break; 189 case 1: /* flags */ 190 if (strcasecmp("rd", word) == 0 || 191 strcasecmp("ro", word) == 0) { 192 flags = O_RDONLY; 193 } else if (strcasecmp("wo", word) == 0) { 194 flags = O_WRONLY; 195 } else if (strcasecmp("rw", word) == 0) { 196 flags = O_RDWR; 197 } else { 198 g_gate_xlog("Invalid value in flags field at " 199 "line %u.", lineno); 200 } 201 sflags = word; 202 break; 203 case 2: /* path */ 204 if (strlen(word) >= MAXPATHLEN) { 205 g_gate_xlog("Path too long at line %u. ", 206 lineno); 207 } 208 path = word; 209 break; 210 default: 211 g_gate_xlog("Too many arguments at line %u. ", lineno); 212 } 213 } 214 if (i != 3) 215 g_gate_xlog("Too few arguments at line %u.", lineno); 216 217 ex = malloc(sizeof(*ex)); 218 if (ex == NULL) 219 g_gate_xlog("Not enough memory."); 220 ex->e_path = strdup(path); 221 if (ex->e_path == NULL) 222 g_gate_xlog("Not enough memory."); 223 224 /* Made 'and' here. */ 225 ex->e_ip = (ip & mask); 226 ex->e_mask = mask; 227 ex->e_flags = flags; 228 229 SLIST_INSERT_HEAD(&exports, ex, e_next); 230 231 g_gate_log(LOG_DEBUG, "Added %s/%u %s %s to exports list.", 232 ip2str(ex->e_ip), vmask, path, sflags); 233} 234 235static void 236exports_clear(void) 237{ 238 struct ggd_export *ex; 239 240 while (!SLIST_EMPTY(&exports)) { 241 ex = SLIST_FIRST(&exports); 242 SLIST_REMOVE_HEAD(&exports, e_next); 243 free(ex); 244 } 245} 246 247#define EXPORTS_LINE_SIZE 2048 248static void 249exports_get(void) 250{ 251 char buf[EXPORTS_LINE_SIZE], *line; 252 unsigned lineno = 0, objs = 0, len; 253 FILE *fd; 254 255 exports_clear(); 256 257 fd = fopen(exports_file, "r"); 258 if (fd == NULL) { 259 g_gate_xlog("Cannot open exports file (%s): %s.", exports_file, 260 strerror(errno)); 261 } 262 263 g_gate_log(LOG_INFO, "Reading exports file (%s).", exports_file); 264 265 for (;;) { 266 if (fgets(buf, sizeof(buf), fd) == NULL) { 267 if (feof(fd)) 268 break; 269 270 g_gate_xlog("Error while reading exports file: %s.", 271 strerror(errno)); 272 } 273 274 /* Increase line count. */ 275 lineno++; 276 277 /* Skip spaces and tabs. */ 278 for (line = buf; *line == ' ' || *line == '\t'; ++line) 279 ; 280 281 /* Empty line, comment or empty line at the end of file. */ 282 if (*line == '\n' || *line == '#' || *line == '\0') 283 continue; 284 285 len = strlen(line); 286 if (line[len - 1] == '\n') { 287 /* Remove new line char. */ 288 line[len - 1] = '\0'; 289 } else { 290 if (!feof(fd)) 291 g_gate_xlog("Line %u too long.", lineno); 292 } 293 294 line_parse(line, lineno); 295 objs++; 296 } 297 298 fclose(fd); 299 300 if (objs == 0) 301 g_gate_xlog("There are no objects to export."); 302 303 g_gate_log(LOG_INFO, "Exporting %u object(s).", objs); 304} 305 306static int 307exports_check(struct ggd_export *ex, struct g_gate_cinit *cinit, 308 struct ggd_connection *conn) 309{ 310 char ipmask[32]; /* 32 == strlen("xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx")+1 */ 311 int error = 0, flags; 312 313 strlcpy(ipmask, ip2str(ex->e_ip), sizeof(ipmask)); 314 strlcat(ipmask, "/", sizeof(ipmask)); 315 strlcat(ipmask, ip2str(ex->e_mask), sizeof(ipmask)); 316 if ((cinit->gc_flags & GGATE_FLAG_RDONLY) != 0) { 317 if (ex->e_flags == O_WRONLY) { 318 g_gate_log(LOG_WARNING, "Read-only access requested, " 319 "but %s (%s) is exported write-only.", ex->e_path, 320 ipmask); 321 return (EPERM); 322 } else { 323 conn->c_flags |= GGATE_FLAG_RDONLY; 324 } 325 } else if ((cinit->gc_flags & GGATE_FLAG_WRONLY) != 0) { 326 if (ex->e_flags == O_RDONLY) { 327 g_gate_log(LOG_WARNING, "Write-only access requested, " 328 "but %s (%s) is exported read-only.", ex->e_path, 329 ipmask); 330 return (EPERM); 331 } else { 332 conn->c_flags |= GGATE_FLAG_WRONLY; 333 } 334 } else { 335 if (ex->e_flags == O_RDONLY) { 336 g_gate_log(LOG_WARNING, "Read-write access requested, " 337 "but %s (%s) is exported read-only.", ex->e_path, 338 ipmask); 339 return (EPERM); 340 } else if (ex->e_flags == O_WRONLY) { 341 g_gate_log(LOG_WARNING, "Read-write access requested, " 342 "but %s (%s) is exported write-only.", ex->e_path, 343 ipmask); 344 return (EPERM); 345 } 346 } 347 if ((conn->c_flags & GGATE_FLAG_RDONLY) != 0) 348 flags = O_RDONLY; 349 else if ((conn->c_flags & GGATE_FLAG_WRONLY) != 0) 350 flags = O_WRONLY; 351 else 352 flags = O_RDWR; 353 if (conn->c_diskfd != -1) { 354 if (strcmp(conn->c_path, ex->e_path) != 0) { 355 g_gate_log(LOG_ERR, "old %s and new %s: " 356 "Path mismatch during handshakes.", 357 conn->c_path, ex->e_path); 358 return (EPERM); 359 } 360 return (0); 361 } 362 363 conn->c_diskfd = open(ex->e_path, flags); 364 if (conn->c_diskfd == -1) { 365 error = errno; 366 g_gate_log(LOG_ERR, "Cannot open %s: %s.", ex->e_path, 367 strerror(error)); 368 return (error); 369 } 370 return (0); 371} 372 373static struct ggd_export * 374exports_find(struct sockaddr *s, struct g_gate_cinit *cinit, 375 struct ggd_connection *conn) 376{ 377 struct ggd_export *ex; 378 in_addr_t ip; 379 int error; 380 381 ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr); 382 SLIST_FOREACH(ex, &exports, e_next) { 383 if ((ip & ex->e_mask) != ex->e_ip) { 384 g_gate_log(LOG_DEBUG, "exports[%s]: IP mismatch.", 385 ex->e_path); 386 continue; 387 } 388 if (strcmp(cinit->gc_path, ex->e_path) != 0) { 389 g_gate_log(LOG_DEBUG, "exports[%s]: Path mismatch.", 390 ex->e_path); 391 continue; 392 } 393 error = exports_check(ex, cinit, conn); 394 if (error == 0) 395 return (ex); 396 else { 397 errno = error; 398 return (NULL); 399 } 400 } 401 g_gate_log(LOG_WARNING, "Unauthorized connection from: %s.", 402 ip2str(ip)); 403 errno = EPERM; 404 return (NULL); 405} 406 407/* 408 * Remove timed out connections. 409 */ 410static void 411connection_cleanups(void) 412{ 413 struct ggd_connection *conn, *tconn; 414 time_t now; 415 416 time(&now); 417 LIST_FOREACH_SAFE(conn, &connections, c_next, tconn) { 418 if (now - conn->c_birthtime > 10) { 419 LIST_REMOVE(conn, c_next); 420 g_gate_log(LOG_NOTICE, 421 "Connection from %s [%s] removed.", 422 ip2str(conn->c_srcip), conn->c_path); 423 close(conn->c_diskfd); 424 close(conn->c_sendfd); 425 close(conn->c_recvfd); 426 free(conn->c_path); 427 free(conn); 428 } 429 } 430} 431 432static struct ggd_connection * 433connection_find(struct g_gate_cinit *cinit) 434{ 435 struct ggd_connection *conn; 436 437 LIST_FOREACH(conn, &connections, c_next) { 438 if (conn->c_token == cinit->gc_token) 439 break; 440 } 441 return (conn); 442} 443 444static struct ggd_connection * 445connection_new(struct g_gate_cinit *cinit, struct sockaddr *s, int sfd) 446{ 447 struct ggd_connection *conn; 448 in_addr_t ip; 449 450 /* 451 * First, look for old connections. 452 * We probably should do it every X seconds, but what for? 453 * It is only dangerous if an attacker wants to overload connections 454 * queue, so here is a good place to do the cleanups. 455 */ 456 connection_cleanups(); 457 458 conn = malloc(sizeof(*conn)); 459 if (conn == NULL) 460 return (NULL); 461 conn->c_path = strdup(cinit->gc_path); 462 if (conn->c_path == NULL) { 463 free(conn); 464 return (NULL); 465 } 466 conn->c_token = cinit->gc_token; 467 ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr); 468 conn->c_srcip = ip; 469 conn->c_diskfd = conn->c_sendfd = conn->c_recvfd = -1; 470 if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0) 471 conn->c_sendfd = sfd; 472 else 473 conn->c_recvfd = sfd; 474 conn->c_mediasize = 0; 475 conn->c_sectorsize = 0; 476 time(&conn->c_birthtime); 477 conn->c_flags = cinit->gc_flags; 478 LIST_INSERT_HEAD(&connections, conn, c_next); 479 g_gate_log(LOG_DEBUG, "Connection created [%s, %s].", ip2str(ip), 480 conn->c_path); 481 return (conn); 482} 483 484static int 485connection_add(struct ggd_connection *conn, struct g_gate_cinit *cinit, 486 struct sockaddr *s, int sfd) 487{ 488 in_addr_t ip; 489 490 ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr); 491 if ((cinit->gc_flags & GGATE_FLAG_SEND) != 0) { 492 if (conn->c_sendfd != -1) { 493 g_gate_log(LOG_WARNING, 494 "Send socket already exists [%s, %s].", ip2str(ip), 495 conn->c_path); 496 return (EEXIST); 497 } 498 conn->c_sendfd = sfd; 499 } else { 500 if (conn->c_recvfd != -1) { 501 g_gate_log(LOG_WARNING, 502 "Receive socket already exists [%s, %s].", 503 ip2str(ip), conn->c_path); 504 return (EEXIST); 505 } 506 conn->c_recvfd = sfd; 507 } 508 g_gate_log(LOG_DEBUG, "Connection added [%s, %s].", ip2str(ip), 509 conn->c_path); 510 return (0); 511} 512 513/* 514 * Remove one socket from the given connection or the whole 515 * connection if sfd == -1. 516 */ 517static void 518connection_remove(struct ggd_connection *conn) 519{ 520 521 LIST_REMOVE(conn, c_next); 522 g_gate_log(LOG_DEBUG, "Connection removed [%s %s].", 523 ip2str(conn->c_srcip), conn->c_path); 524 if (conn->c_diskfd != -1) 525 close(conn->c_diskfd); 526 if (conn->c_sendfd != -1) 527 close(conn->c_sendfd); 528 if (conn->c_recvfd != -1) 529 close(conn->c_recvfd); 530 free(conn->c_path); 531 free(conn); 532} 533 534static int 535connection_ready(struct ggd_connection *conn) 536{ 537 538 return (conn->c_sendfd != -1 && conn->c_recvfd != -1); 539} 540 541static void 542connection_launch(struct ggd_connection *conn) 543{ 544 pthread_t td; 545 int error, pid; 546 547 pid = fork(); 548 if (pid > 0) 549 return; 550 else if (pid == -1) { 551 g_gate_log(LOG_ERR, "Cannot fork: %s.", strerror(errno)); 552 return; 553 } 554 g_gate_log(LOG_DEBUG, "Process created [%s].", conn->c_path); 555 556 /* 557 * Create condition variables and mutexes for in-queue and out-queue 558 * synchronization. 559 */ 560 error = pthread_mutex_init(&inqueue_mtx, NULL); 561 if (error != 0) { 562 g_gate_xlog("pthread_mutex_init(inqueue_mtx): %s.", 563 strerror(error)); 564 } 565 error = pthread_cond_init(&inqueue_cond, NULL); 566 if (error != 0) { 567 g_gate_xlog("pthread_cond_init(inqueue_cond): %s.", 568 strerror(error)); 569 } 570 error = pthread_mutex_init(&outqueue_mtx, NULL); 571 if (error != 0) { 572 g_gate_xlog("pthread_mutex_init(outqueue_mtx): %s.", 573 strerror(error)); 574 } 575 error = pthread_cond_init(&outqueue_cond, NULL); 576 if (error != 0) { 577 g_gate_xlog("pthread_cond_init(outqueue_cond): %s.", 578 strerror(error)); 579 } 580 581 /* 582 * Create threads: 583 * recvtd - thread for receiving I/O request 584 * diskio - thread for doing I/O request 585 * sendtd - thread for sending I/O requests back 586 */ 587 error = pthread_create(&td, NULL, send_thread, conn); 588 if (error != 0) { 589 g_gate_xlog("pthread_create(send_thread): %s.", 590 strerror(error)); 591 } 592 error = pthread_create(&td, NULL, recv_thread, conn); 593 if (error != 0) { 594 g_gate_xlog("pthread_create(recv_thread): %s.", 595 strerror(error)); 596 } 597 disk_thread(conn); 598} 599 600static void 601sendfail(int sfd, int error, const char *fmt, ...) 602{ 603 struct g_gate_sinit sinit; 604 va_list ap; 605 ssize_t data; 606 607 memset(&sinit, 0, sizeof(sinit)); 608 sinit.gs_error = error; 609 g_gate_swap2n_sinit(&sinit); 610 data = g_gate_send(sfd, &sinit, sizeof(sinit), 0); 611 g_gate_swap2h_sinit(&sinit); 612 if (data != sizeof(sinit)) { 613 g_gate_log(LOG_WARNING, "Cannot send initial packet: %s.", 614 strerror(errno)); 615 return; 616 } 617 if (fmt != NULL) { 618 va_start(ap, fmt); 619 g_gate_vlog(LOG_WARNING, fmt, ap); 620 va_end(ap); 621 } 622} 623 624static void * 625malloc_waitok(size_t size) 626{ 627 void *p; 628 629 while ((p = malloc(size)) == NULL) { 630 g_gate_log(LOG_DEBUG, "Cannot allocate %zu bytes.", size); 631 sleep(1); 632 } 633 return (p); 634} 635 636static void * 637recv_thread(void *arg) 638{ 639 struct ggd_connection *conn; 640 struct ggd_request *req; 641 ssize_t data; 642 int error, fd; 643 644 conn = arg; 645 g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path); 646 fd = conn->c_recvfd; 647 for (;;) { 648 /* 649 * Get header packet. 650 */ 651 req = malloc_waitok(sizeof(*req)); 652 data = g_gate_recv(fd, &req->r_hdr, sizeof(req->r_hdr), 653 MSG_WAITALL); 654 if (data == 0) { 655 g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid()); 656 exit(EXIT_SUCCESS); 657 } else if (data == -1) { 658 g_gate_xlog("Error while receiving hdr packet: %s.", 659 strerror(errno)); 660 } else if (data != sizeof(req->r_hdr)) { 661 g_gate_xlog("Malformed hdr packet received."); 662 } 663 g_gate_log(LOG_DEBUG, "Received hdr packet."); 664 g_gate_swap2h_hdr(&req->r_hdr); 665 666 g_gate_log(LOG_DEBUG, "%s: offset=%" PRIu64 " length=%" PRIu32, 667 __func__, req->r_offset, req->r_length); 668 669 /* 670 * Allocate memory for data. 671 */ 672 req->r_data = malloc_waitok(req->r_length); 673 674 /* 675 * Receive data to write for WRITE request. 676 */ 677 if (req->r_cmd == GGATE_CMD_WRITE) { 678 g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...", 679 req->r_length); 680 data = g_gate_recv(fd, req->r_data, req->r_length, 681 MSG_WAITALL); 682 if (data == -1) { 683 g_gate_xlog("Error while receiving data: %s.", 684 strerror(errno)); 685 } 686 } 687 688 /* 689 * Put the request onto the incoming queue. 690 */ 691 error = pthread_mutex_lock(&inqueue_mtx); 692 assert(error == 0); 693 TAILQ_INSERT_TAIL(&inqueue, req, r_next); 694 error = pthread_cond_signal(&inqueue_cond); 695 assert(error == 0); 696 error = pthread_mutex_unlock(&inqueue_mtx); 697 assert(error == 0); 698 } 699} 700 701static void * 702disk_thread(void *arg) 703{ 704 struct ggd_connection *conn; 705 struct ggd_request *req; 706 ssize_t data; 707 int error, fd; 708 709 conn = arg; 710 g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path); 711 fd = conn->c_diskfd; 712 for (;;) { 713 /* 714 * Get a request from the incoming queue. 715 */ 716 error = pthread_mutex_lock(&inqueue_mtx); 717 assert(error == 0); 718 while ((req = TAILQ_FIRST(&inqueue)) == NULL) { 719 error = pthread_cond_wait(&inqueue_cond, &inqueue_mtx); 720 assert(error == 0); 721 } 722 TAILQ_REMOVE(&inqueue, req, r_next); 723 error = pthread_mutex_unlock(&inqueue_mtx); 724 assert(error == 0); 725 726 /* 727 * Check the request. 728 */ 729 assert(req->r_cmd == GGATE_CMD_READ || req->r_cmd == GGATE_CMD_WRITE); 730 assert(req->r_offset + req->r_length <= (uintmax_t)conn->c_mediasize); 731 assert((req->r_offset % conn->c_sectorsize) == 0); 732 assert((req->r_length % conn->c_sectorsize) == 0); 733 734 g_gate_log(LOG_DEBUG, "%s: offset=%" PRIu64 " length=%" PRIu32, 735 __func__, req->r_offset, req->r_length); 736 737 /* 738 * Do the request. 739 */ 740 data = 0; 741 switch (req->r_cmd) { 742 case GGATE_CMD_READ: 743 data = pread(fd, req->r_data, req->r_length, 744 req->r_offset); 745 break; 746 case GGATE_CMD_WRITE: 747 data = pwrite(fd, req->r_data, req->r_length, 748 req->r_offset); 749 /* Free data memory here - better sooner. */ 750 free(req->r_data); 751 req->r_data = NULL; 752 break; 753 } 754 if (data != (ssize_t)req->r_length) { 755 /* Report short reads/writes as I/O errors. */ 756 if (errno == 0) 757 errno = EIO; 758 g_gate_log(LOG_ERR, "Disk error: %s", strerror(errno)); 759 req->r_error = errno; 760 if (req->r_data != NULL) { 761 free(req->r_data); 762 req->r_data = NULL; 763 } 764 } 765 766 /* 767 * Put the request onto the outgoing queue. 768 */ 769 error = pthread_mutex_lock(&outqueue_mtx); 770 assert(error == 0); 771 TAILQ_INSERT_TAIL(&outqueue, req, r_next); 772 error = pthread_cond_signal(&outqueue_cond); 773 assert(error == 0); 774 error = pthread_mutex_unlock(&outqueue_mtx); 775 assert(error == 0); 776 } 777 778 /* NOTREACHED */ 779 return (NULL); 780} 781 782static void * 783send_thread(void *arg) 784{ 785 struct ggd_connection *conn; 786 struct ggd_request *req; 787 ssize_t data; 788 int error, fd; 789 790 conn = arg; 791 g_gate_log(LOG_NOTICE, "%s: started [%s]!", __func__, conn->c_path); 792 fd = conn->c_sendfd; 793 for (;;) { 794 /* 795 * Get a request from the outgoing queue. 796 */ 797 error = pthread_mutex_lock(&outqueue_mtx); 798 assert(error == 0); 799 while ((req = TAILQ_FIRST(&outqueue)) == NULL) { 800 error = pthread_cond_wait(&outqueue_cond, 801 &outqueue_mtx); 802 assert(error == 0); 803 } 804 TAILQ_REMOVE(&outqueue, req, r_next); 805 error = pthread_mutex_unlock(&outqueue_mtx); 806 assert(error == 0); 807 808 g_gate_log(LOG_DEBUG, "%s: offset=%" PRIu64 " length=%" PRIu32, 809 __func__, req->r_offset, req->r_length); 810 811 /* 812 * Send the request. 813 */ 814 g_gate_swap2n_hdr(&req->r_hdr); 815 if (g_gate_send(fd, &req->r_hdr, sizeof(req->r_hdr), 0) == -1) { 816 g_gate_xlog("Error while sending hdr packet: %s.", 817 strerror(errno)); 818 } 819 g_gate_log(LOG_DEBUG, "Sent hdr packet."); 820 g_gate_swap2h_hdr(&req->r_hdr); 821 if (req->r_data != NULL) { 822 data = g_gate_send(fd, req->r_data, req->r_length, 0); 823 if (data != (ssize_t)req->r_length) { 824 g_gate_xlog("Error while sending data: %s.", 825 strerror(errno)); 826 } 827 g_gate_log(LOG_DEBUG, 828 "Sent %zd bytes (offset=%" PRIu64 ", size=%" PRIu32 829 ").", data, req->r_offset, req->r_length); 830 free(req->r_data); 831 } 832 free(req); 833 } 834 835 /* NOTREACHED */ 836 return (NULL); 837} 838 839static void 840log_connection(struct sockaddr *from) 841{ 842 in_addr_t ip; 843 844 ip = htonl(((struct sockaddr_in *)(void *)from)->sin_addr.s_addr); 845 g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip)); 846} 847 848static int 849handshake(struct sockaddr *from, int sfd) 850{ 851 struct g_gate_version ver; 852 struct g_gate_cinit cinit; 853 struct g_gate_sinit sinit; 854 struct ggd_connection *conn; 855 struct ggd_export *ex; 856 ssize_t data; 857 858 log_connection(from); 859 /* 860 * Phase 1: Version verification. 861 */ 862 g_gate_log(LOG_DEBUG, "Receiving version packet."); 863 data = g_gate_recv(sfd, &ver, sizeof(ver), MSG_WAITALL); 864 g_gate_swap2h_version(&ver); 865 if (data != sizeof(ver)) { 866 g_gate_log(LOG_WARNING, "Malformed version packet."); 867 return (0); 868 } 869 g_gate_log(LOG_DEBUG, "Version packet received."); 870 if (memcmp(ver.gv_magic, GGATE_MAGIC, strlen(GGATE_MAGIC)) != 0) { 871 g_gate_log(LOG_WARNING, "Invalid magic field."); 872 return (0); 873 } 874 if (ver.gv_version != GGATE_VERSION) { 875 g_gate_log(LOG_WARNING, "Version %u is not supported.", 876 ver.gv_version); 877 return (0); 878 } 879 ver.gv_error = 0; 880 g_gate_swap2n_version(&ver); 881 data = g_gate_send(sfd, &ver, sizeof(ver), 0); 882 g_gate_swap2h_version(&ver); 883 if (data == -1) { 884 sendfail(sfd, errno, "Error while sending version packet: %s.", 885 strerror(errno)); 886 return (0); 887 } 888 889 /* 890 * Phase 2: Request verification. 891 */ 892 g_gate_log(LOG_DEBUG, "Receiving initial packet."); 893 data = g_gate_recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL); 894 g_gate_swap2h_cinit(&cinit); 895 if (data != sizeof(cinit)) { 896 g_gate_log(LOG_WARNING, "Malformed initial packet."); 897 return (0); 898 } 899 g_gate_log(LOG_DEBUG, "Initial packet received."); 900 conn = connection_find(&cinit); 901 if (conn != NULL) { 902 /* 903 * Connection should already exists. 904 */ 905 g_gate_log(LOG_DEBUG, "Found existing connection (token=%lu).", 906 (unsigned long)conn->c_token); 907 if (connection_add(conn, &cinit, from, sfd) == -1) { 908 connection_remove(conn); 909 return (0); 910 } 911 } else { 912 /* 913 * New connection, allocate space. 914 */ 915 conn = connection_new(&cinit, from, sfd); 916 if (conn == NULL) { 917 sendfail(sfd, ENOMEM, 918 "Cannot allocate new connection."); 919 return (0); 920 } 921 g_gate_log(LOG_DEBUG, "New connection created (token=%lu).", 922 (unsigned long)conn->c_token); 923 } 924 925 ex = exports_find(from, &cinit, conn); 926 if (ex == NULL) { 927 sendfail(sfd, errno, NULL); 928 connection_remove(conn); 929 return (0); 930 } 931 if (conn->c_mediasize == 0) { 932 conn->c_mediasize = g_gate_mediasize(conn->c_diskfd); 933 conn->c_sectorsize = g_gate_sectorsize(conn->c_diskfd); 934 } 935 sinit.gs_mediasize = conn->c_mediasize; 936 sinit.gs_sectorsize = conn->c_sectorsize; 937 sinit.gs_error = 0; 938 939 g_gate_log(LOG_DEBUG, "Sending initial packet."); 940 941 g_gate_swap2n_sinit(&sinit); 942 data = g_gate_send(sfd, &sinit, sizeof(sinit), 0); 943 g_gate_swap2h_sinit(&sinit); 944 if (data == -1) { 945 sendfail(sfd, errno, "Error while sending initial packet: %s.", 946 strerror(errno)); 947 return (0); 948 } 949 950 if (connection_ready(conn)) { 951 connection_launch(conn); 952 connection_remove(conn); 953 } 954 return (1); 955} 956 957static void 958huphandler(int sig __unused) 959{ 960 961 got_sighup = 1; 962} 963 964int 965main(int argc, char *argv[]) 966{ 967 const char *ggated_pidfile = _PATH_VARRUN "/ggated.pid"; 968 struct pidfh *pfh; 969 struct sockaddr_in serv; 970 struct sockaddr from; 971 socklen_t fromlen; 972 pid_t otherpid; 973 int ch, sfd, tmpsfd; 974 unsigned port; 975 976 bindaddr = htonl(INADDR_ANY); 977 port = G_GATE_PORT; 978 while ((ch = getopt(argc, argv, "a:hnp:F:R:S:v")) != -1) { 979 switch (ch) { 980 case 'a': 981 bindaddr = g_gate_str2ip(optarg); 982 if (bindaddr == INADDR_NONE) { 983 errx(EXIT_FAILURE, 984 "Invalid IP/host name to bind to."); 985 } 986 break; 987 case 'F': 988 ggated_pidfile = optarg; 989 break; 990 case 'n': 991 nagle = 0; 992 break; 993 case 'p': 994 errno = 0; 995 port = strtoul(optarg, NULL, 10); 996 if (port == 0 && errno != 0) 997 errx(EXIT_FAILURE, "Invalid port."); 998 break; 999 case 'R': 1000 errno = 0; 1001 rcvbuf = strtoul(optarg, NULL, 10); 1002 if (rcvbuf == 0 && errno != 0) 1003 errx(EXIT_FAILURE, "Invalid rcvbuf."); 1004 break; 1005 case 'S': 1006 errno = 0; 1007 sndbuf = strtoul(optarg, NULL, 10); 1008 if (sndbuf == 0 && errno != 0) 1009 errx(EXIT_FAILURE, "Invalid sndbuf."); 1010 break; 1011 case 'v': 1012 g_gate_verbose++; 1013 break; 1014 case 'h': 1015 default: 1016 usage(); 1017 } 1018 } 1019 argc -= optind; 1020 argv += optind; 1021 1022 if (argv[0] != NULL) 1023 exports_file = argv[0]; 1024 exports_get(); 1025 1026 pfh = pidfile_open(ggated_pidfile, 0600, &otherpid); 1027 if (pfh == NULL) { 1028 if (errno == EEXIST) { 1029 errx(EXIT_FAILURE, "Daemon already running, pid: %jd.", 1030 (intmax_t)otherpid); 1031 } 1032 err(EXIT_FAILURE, "Cannot open/create pidfile"); 1033 } 1034 1035 if (!g_gate_verbose) { 1036 /* Run in daemon mode. */ 1037 if (daemon(0, 0) == -1) 1038 g_gate_xlog("Cannot daemonize: %s", strerror(errno)); 1039 } 1040 1041 pidfile_write(pfh); 1042 1043 signal(SIGCHLD, SIG_IGN); 1044 1045 sfd = socket(AF_INET, SOCK_STREAM, 0); 1046 if (sfd == -1) 1047 g_gate_xlog("Cannot open stream socket: %s.", strerror(errno)); 1048 bzero(&serv, sizeof(serv)); 1049 serv.sin_family = AF_INET; 1050 serv.sin_addr.s_addr = bindaddr; 1051 serv.sin_port = htons(port); 1052 1053 g_gate_socket_settings(sfd); 1054 1055 if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) == -1) 1056 g_gate_xlog("bind(): %s.", strerror(errno)); 1057 if (listen(sfd, 5) == -1) 1058 g_gate_xlog("listen(): %s.", strerror(errno)); 1059 1060 g_gate_log(LOG_INFO, "Listen on port: %d.", port); 1061 1062 signal(SIGHUP, huphandler); 1063 1064 for (;;) { 1065 fromlen = sizeof(from); 1066 tmpsfd = accept(sfd, &from, &fromlen); 1067 if (tmpsfd == -1) 1068 g_gate_xlog("accept(): %s.", strerror(errno)); 1069 1070 if (got_sighup) { 1071 got_sighup = 0; 1072 exports_get(); 1073 } 1074 1075 if (!handshake(&from, tmpsfd)) 1076 close(tmpsfd); 1077 } 1078 close(sfd); 1079 pidfile_remove(pfh); 1080 exit(EXIT_SUCCESS); 1081} 1082