1 /* $OpenBSD: main.c,v 1.56 2021/07/14 11:14:27 claudio Exp $ */ 2 /* 3 * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #include <sys/stat.h> 18 #include <sys/socket.h> 19 #include <sys/wait.h> 20 21 #include <assert.h> 22 #include <err.h> 23 #include <getopt.h> 24 #include <stdint.h> 25 #include <stdio.h> 26 #include <stdlib.h> 27 #include <string.h> 28 #include <unistd.h> 29 30 #include "extern.h" 31 32 int verbose; 33 int poll_timeout; 34 35 /* 36 * A remote host is has a colon before the first path separator. 37 * This works for rsh remote hosts (host:/foo/bar), implicit rsync 38 * remote hosts (host::/foo/bar), and explicit (rsync://host/foo). 39 * Return zero if local, non-zero if remote. 40 */ 41 static int 42 fargs_is_remote(const char *v) 43 { 44 size_t pos; 45 46 pos = strcspn(v, ":/"); 47 return v[pos] == ':'; 48 } 49 50 /* 51 * Test whether a remote host is specifically an rsync daemon. 52 * Return zero if not, non-zero if so. 53 */ 54 static int 55 fargs_is_daemon(const char *v) 56 { 57 size_t pos; 58 59 if (strncasecmp(v, "rsync://", 8) == 0) 60 return 1; 61 62 pos = strcspn(v, ":/"); 63 return v[pos] == ':' && v[pos + 1] == ':'; 64 } 65 66 /* 67 * Take the command-line filenames (e.g., rsync foo/ bar/ baz/) and 68 * determine our operating mode. 69 * For example, if the first argument is a remote file, this means that 70 * we're going to transfer from the remote to the local. 71 * We also make sure that the arguments are consistent, that is, if 72 * we're going to transfer from the local to the remote, that no 73 * filenames for the local transfer indicate remote hosts. 74 * Always returns the parsed and sanitised options. 75 */ 76 static struct fargs * 77 fargs_parse(size_t argc, char *argv[], struct opts *opts) 78 { 79 struct fargs *f = NULL; 80 char *cp, *ccp; 81 size_t i, j, len = 0; 82 83 /* Allocations. */ 84 85 if ((f = calloc(1, sizeof(struct fargs))) == NULL) 86 err(ERR_NOMEM, NULL); 87 88 f->sourcesz = argc - 1; 89 if ((f->sources = calloc(f->sourcesz, sizeof(char *))) == NULL) 90 err(ERR_NOMEM, NULL); 91 92 for (i = 0; i < argc - 1; i++) 93 if ((f->sources[i] = strdup(argv[i])) == NULL) 94 err(ERR_NOMEM, NULL); 95 96 if ((f->sink = strdup(argv[i])) == NULL) 97 err(ERR_NOMEM, NULL); 98 99 /* 100 * Test files for its locality. 101 * If the last is a remote host, then we're sending from the 102 * local to the remote host ("sender" mode). 103 * If the first, remote to local ("receiver" mode). 104 * If neither, a local transfer in sender style. 105 */ 106 107 f->mode = FARGS_SENDER; 108 109 if (fargs_is_remote(f->sink)) { 110 f->mode = FARGS_SENDER; 111 if ((f->host = strdup(f->sink)) == NULL) 112 err(ERR_NOMEM, NULL); 113 } 114 115 if (fargs_is_remote(f->sources[0])) { 116 if (f->host != NULL) 117 errx(ERR_SYNTAX, "both source and destination " 118 "cannot be remote files"); 119 f->mode = FARGS_RECEIVER; 120 if ((f->host = strdup(f->sources[0])) == NULL) 121 err(ERR_NOMEM, NULL); 122 } 123 124 if (f->host != NULL) { 125 if (strncasecmp(f->host, "rsync://", 8) == 0) { 126 /* rsync://host[:port]/module[/path] */ 127 f->remote = 1; 128 len = strlen(f->host) - 8 + 1; 129 memmove(f->host, f->host + 8, len); 130 if ((cp = strchr(f->host, '/')) == NULL) 131 errx(ERR_SYNTAX, 132 "rsync protocol requires a module name"); 133 *cp++ = '\0'; 134 f->module = cp; 135 if ((cp = strchr(f->module, '/')) != NULL) 136 *cp = '\0'; 137 if ((cp = strchr(f->host, ':')) != NULL) { 138 /* host:port --> extract port */ 139 *cp++ = '\0'; 140 opts->port = cp; 141 } 142 } else { 143 /* host:[/path] */ 144 cp = strchr(f->host, ':'); 145 assert(cp != NULL); 146 *cp++ = '\0'; 147 if (*cp == ':') { 148 /* host::module[/path] */ 149 f->remote = 1; 150 f->module = ++cp; 151 cp = strchr(f->module, '/'); 152 if (cp != NULL) 153 *cp = '\0'; 154 } 155 } 156 if ((len = strlen(f->host)) == 0) 157 errx(ERR_SYNTAX, "empty remote host"); 158 if (f->remote && strlen(f->module) == 0) 159 errx(ERR_SYNTAX, "empty remote module"); 160 } 161 162 /* Make sure we have the same "hostspec" for all files. */ 163 164 if (!f->remote) { 165 if (f->mode == FARGS_SENDER) 166 for (i = 0; i < f->sourcesz; i++) { 167 if (!fargs_is_remote(f->sources[i])) 168 continue; 169 errx(ERR_SYNTAX, 170 "remote file in list of local sources: %s", 171 f->sources[i]); 172 } 173 if (f->mode == FARGS_RECEIVER) 174 for (i = 0; i < f->sourcesz; i++) { 175 if (fargs_is_remote(f->sources[i]) && 176 !fargs_is_daemon(f->sources[i])) 177 continue; 178 if (fargs_is_daemon(f->sources[i])) 179 errx(ERR_SYNTAX, 180 "remote daemon in list of remote " 181 "sources: %s", f->sources[i]); 182 errx(ERR_SYNTAX, "local file in list of " 183 "remote sources: %s", f->sources[i]); 184 } 185 } else { 186 if (f->mode != FARGS_RECEIVER) 187 errx(ERR_SYNTAX, "sender mode for remote " 188 "daemon receivers not yet supported"); 189 for (i = 0; i < f->sourcesz; i++) { 190 if (fargs_is_daemon(f->sources[i])) 191 continue; 192 errx(ERR_SYNTAX, "non-remote daemon file " 193 "in list of remote daemon sources: " 194 "%s", f->sources[i]); 195 } 196 } 197 198 /* 199 * If we're not remote and a sender, strip our hostname. 200 * Then exit if we're a sender or a local connection. 201 */ 202 203 if (!f->remote) { 204 if (f->host == NULL) 205 return f; 206 if (f->mode == FARGS_SENDER) { 207 assert(f->host != NULL); 208 assert(len > 0); 209 j = strlen(f->sink); 210 memmove(f->sink, f->sink + len + 1, j - len); 211 return f; 212 } else if (f->mode != FARGS_RECEIVER) 213 return f; 214 } 215 216 /* 217 * Now strip the hostnames from the remote host. 218 * rsync://host/module/path -> module/path 219 * host::module/path -> module/path 220 * host:path -> path 221 * Also make sure that the remote hosts are the same. 222 */ 223 224 assert(f->host != NULL); 225 assert(len > 0); 226 227 for (i = 0; i < f->sourcesz; i++) { 228 cp = f->sources[i]; 229 j = strlen(cp); 230 if (f->remote && 231 strncasecmp(cp, "rsync://", 8) == 0) { 232 /* rsync://path */ 233 cp += 8; 234 if ((ccp = strchr(cp, ':'))) /* skip :port */ 235 *ccp = '\0'; 236 if (strncmp(cp, f->host, len) || 237 (cp[len] != '/' && cp[len] != '\0')) 238 errx(ERR_SYNTAX, "different remote host: %s", 239 f->sources[i]); 240 memmove(f->sources[i], 241 f->sources[i] + len + 8 + 1, 242 j - len - 8); 243 } else if (f->remote && strncmp(cp, "::", 2) == 0) { 244 /* ::path */ 245 memmove(f->sources[i], 246 f->sources[i] + 2, j - 1); 247 } else if (f->remote) { 248 /* host::path */ 249 if (strncmp(cp, f->host, len) || 250 (cp[len] != ':' && cp[len] != '\0')) 251 errx(ERR_SYNTAX, "different remote host: %s", 252 f->sources[i]); 253 memmove(f->sources[i], f->sources[i] + len + 2, 254 j - len - 1); 255 } else if (cp[0] == ':') { 256 /* :path */ 257 memmove(f->sources[i], f->sources[i] + 1, j); 258 } else { 259 /* host:path */ 260 if (strncmp(cp, f->host, len) || 261 (cp[len] != ':' && cp[len] != '\0')) 262 errx(ERR_SYNTAX, "different remote host: %s", 263 f->sources[i]); 264 memmove(f->sources[i], 265 f->sources[i] + len + 1, j - len); 266 } 267 } 268 269 return f; 270 } 271 272 static struct opts opts; 273 274 #define OP_ADDRESS 1000 275 #define OP_PORT 1001 276 #define OP_RSYNCPATH 1002 277 #define OP_TIMEOUT 1003 278 #define OP_VERSION 1004 279 280 const struct option lopts[] = { 281 { "address", required_argument, NULL, OP_ADDRESS }, 282 { "archive", no_argument, NULL, 'a' }, 283 { "compress", no_argument, NULL, 'z' }, 284 { "del", no_argument, &opts.del, 1 }, 285 { "delete", no_argument, &opts.del, 1 }, 286 { "devices", no_argument, &opts.devices, 1 }, 287 { "no-devices", no_argument, &opts.devices, 0 }, 288 { "dry-run", no_argument, &opts.dry_run, 1 }, 289 { "group", no_argument, &opts.preserve_gids, 1 }, 290 { "no-group", no_argument, &opts.preserve_gids, 0 }, 291 { "help", no_argument, NULL, 'h' }, 292 { "links", no_argument, &opts.preserve_links, 1 }, 293 { "no-links", no_argument, &opts.preserve_links, 0 }, 294 { "no-motd", no_argument, &opts.no_motd, 1 }, 295 { "numeric-ids", no_argument, &opts.numeric_ids, 1 }, 296 { "owner", no_argument, &opts.preserve_uids, 1 }, 297 { "no-owner", no_argument, &opts.preserve_uids, 0 }, 298 { "perms", no_argument, &opts.preserve_perms, 1 }, 299 { "no-perms", no_argument, &opts.preserve_perms, 0 }, 300 { "port", required_argument, NULL, OP_PORT }, 301 { "recursive", no_argument, &opts.recursive, 1 }, 302 { "no-recursive", no_argument, &opts.recursive, 0 }, 303 { "rsh", required_argument, NULL, 'e' }, 304 { "rsync-path", required_argument, NULL, OP_RSYNCPATH }, 305 { "sender", no_argument, &opts.sender, 1 }, 306 { "server", no_argument, &opts.server, 1 }, 307 { "specials", no_argument, &opts.specials, 1 }, 308 { "no-specials", no_argument, &opts.specials, 0 }, 309 { "timeout", required_argument, NULL, OP_TIMEOUT }, 310 { "times", no_argument, &opts.preserve_times, 1 }, 311 { "no-times", no_argument, &opts.preserve_times, 0 }, 312 { "verbose", no_argument, &verbose, 1 }, 313 { "no-verbose", no_argument, &verbose, 0 }, 314 { "version", no_argument, NULL, OP_VERSION }, 315 { NULL, 0, NULL, 0 } 316 }; 317 318 int 319 main(int argc, char *argv[]) 320 { 321 pid_t child; 322 int fds[2], sd = -1, rc, c, st, i; 323 struct sess sess; 324 struct fargs *fargs; 325 char **args; 326 const char *errstr; 327 /* Global pledge. */ 328 329 if (pledge("stdio unix rpath wpath cpath dpath inet fattr chown dns getpw proc exec unveil", 330 NULL) == -1) 331 err(ERR_IPC, "pledge"); 332 333 while ((c = getopt_long(argc, argv, "Dae:ghlnoprtvxz", lopts, NULL)) 334 != -1) { 335 switch (c) { 336 case 'D': 337 opts.devices = 1; 338 opts.specials = 1; 339 break; 340 case 'a': 341 opts.recursive = 1; 342 opts.preserve_links = 1; 343 opts.preserve_perms = 1; 344 opts.preserve_times = 1; 345 opts.preserve_gids = 1; 346 opts.preserve_uids = 1; 347 opts.devices = 1; 348 opts.specials = 1; 349 break; 350 case 'e': 351 opts.ssh_prog = optarg; 352 break; 353 case 'g': 354 opts.preserve_gids = 1; 355 break; 356 case 'l': 357 opts.preserve_links = 1; 358 break; 359 case 'n': 360 opts.dry_run = 1; 361 break; 362 case 'o': 363 opts.preserve_uids = 1; 364 break; 365 case 'p': 366 opts.preserve_perms = 1; 367 break; 368 case 'r': 369 opts.recursive = 1; 370 break; 371 case 't': 372 opts.preserve_times = 1; 373 break; 374 case 'v': 375 verbose++; 376 break; 377 case 'x': 378 opts.one_file_system++; 379 break; 380 case 'z': 381 fprintf(stderr, "%s: -z not supported yet\n", getprogname()); 382 break; 383 case 0: 384 /* Non-NULL flag values (e.g., --sender). */ 385 break; 386 case OP_ADDRESS: 387 opts.address = optarg; 388 break; 389 case OP_PORT: 390 opts.port = optarg; 391 break; 392 case OP_RSYNCPATH: 393 opts.rsync_path = optarg; 394 break; 395 case OP_TIMEOUT: 396 poll_timeout = strtonum(optarg, 0, 60*60, &errstr); 397 if (errstr != NULL) 398 errx(ERR_SYNTAX, "timeout is %s: %s", 399 errstr, optarg); 400 break; 401 case OP_VERSION: 402 fprintf(stderr, "openrsync: protocol version %u\n", 403 RSYNC_PROTOCOL); 404 exit(0); 405 case 'h': 406 default: 407 goto usage; 408 } 409 } 410 411 argc -= optind; 412 argv += optind; 413 414 /* FIXME: reference implementation rsync accepts this. */ 415 416 if (argc < 2) 417 goto usage; 418 419 if (opts.port == NULL) 420 opts.port = "rsync"; 421 422 /* by default and for --timeout=0 disable poll_timeout */ 423 if (poll_timeout == 0) 424 poll_timeout = -1; 425 else 426 poll_timeout *= 1000; 427 428 /* 429 * This is what happens when we're started with the "hidden" 430 * --server option, which is invoked for the rsync on the remote 431 * host by the parent. 432 */ 433 434 if (opts.server) 435 exit(rsync_server(&opts, (size_t)argc, argv)); 436 437 /* 438 * Now we know that we're the client on the local machine 439 * invoking rsync(1). 440 * At this point, we need to start the client and server 441 * initiation logic. 442 * The client is what we continue running on this host; the 443 * server is what we'll use to connect to the remote and 444 * invoke rsync with the --server option. 445 */ 446 447 fargs = fargs_parse(argc, argv, &opts); 448 assert(fargs != NULL); 449 450 /* 451 * If we're contacting an rsync:// daemon, then we don't need to 452 * fork, because we won't start a server ourselves. 453 * Route directly into the socket code, unless a remote shell 454 * has explicitly been specified. 455 */ 456 457 if (fargs->remote && opts.ssh_prog == NULL) { 458 assert(fargs->mode == FARGS_RECEIVER); 459 if ((rc = rsync_connect(&opts, &sd, fargs)) == 0) { 460 rc = rsync_socket(&opts, sd, fargs); 461 close(sd); 462 } 463 exit(rc); 464 } 465 466 /* Drop the dns/inet possibility. */ 467 468 if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw proc exec unveil", 469 NULL) == -1) 470 err(ERR_IPC, "pledge"); 471 472 /* Create a bidirectional socket and start our child. */ 473 474 if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, fds) == -1) 475 err(ERR_IPC, "socketpair"); 476 477 switch ((child = fork())) { 478 case -1: 479 err(ERR_IPC, "fork"); 480 case 0: 481 close(fds[0]); 482 if (pledge("stdio exec", NULL) == -1) 483 err(ERR_IPC, "pledge"); 484 485 memset(&sess, 0, sizeof(struct sess)); 486 sess.opts = &opts; 487 488 args = fargs_cmdline(&sess, fargs, NULL); 489 490 for (i = 0; args[i] != NULL; i++) 491 LOG2("exec[%d] = %s", i, args[i]); 492 493 /* Make sure the child's stdin is from the sender. */ 494 if (dup2(fds[1], STDIN_FILENO) == -1) 495 err(ERR_IPC, "dup2"); 496 if (dup2(fds[1], STDOUT_FILENO) == -1) 497 err(ERR_IPC, "dup2"); 498 execvp(args[0], args); 499 _exit(ERR_IPC); 500 /* NOTREACHED */ 501 default: 502 close(fds[1]); 503 if (!fargs->remote) 504 rc = rsync_client(&opts, fds[0], fargs); 505 else 506 rc = rsync_socket(&opts, fds[0], fargs); 507 break; 508 } 509 510 close(fds[0]); 511 512 if (waitpid(child, &st, 0) == -1) 513 err(ERR_WAITPID, "waitpid"); 514 515 /* 516 * If we don't already have an error (rc == 0), then inherit the 517 * error code of rsync_server() if it has exited. 518 * If it hasn't exited, it overrides our return value. 519 */ 520 521 if (rc == 0) { 522 if (WIFEXITED(st)) 523 rc = WEXITSTATUS(st); 524 else if (WIFSIGNALED(st)) 525 rc = ERR_TERMIMATED; 526 else 527 rc = ERR_WAITPID; 528 } 529 530 exit(rc); 531 usage: 532 fprintf(stderr, "usage: %s" 533 " [-aDglnoprtvx] [-e program] [--address=sourceaddr] [--del]\n" 534 "\t[--no-motd] [--numeric-ids] [--port=portnumber] " 535 "[--rsync-path=program]\n\t[--timeout=seconds] [--version] " 536 "source ... directory\n", 537 getprogname()); 538 exit(ERR_SYNTAX); 539 } 540