1 /*- 2 * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer 10 * in this position and unchanged. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/stat.h> 33 #include <sys/socket.h> 34 35 #include <ctype.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <signal.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <sysexits.h> 43 #include <unistd.h> 44 45 #include <fetch.h> 46 47 #define MINBUFSIZE 4096 48 49 /* Option flags */ 50 int A_flag; /* -A: do not follow 302 redirects */ 51 int a_flag; /* -a: auto retry */ 52 size_t B_size; /* -B: buffer size */ 53 int b_flag; /*! -b: workaround TCP bug */ 54 char *c_dirname; /* -c: remote directory */ 55 int d_flag; /* -d: direct connection */ 56 int F_flag; /* -F: restart without checking mtime */ 57 char *f_filename; /* -f: file to fetch */ 58 int H_flag; /* -H: use high port */ 59 char *h_hostname; /* -h: host to fetch from */ 60 int l_flag; /* -l: link rather than copy file: URLs */ 61 int m_flag; /* -[Mm]: mirror mode */ 62 int n_flag; /* -n: do not preserve modification time */ 63 int o_flag; /* -o: specify output file */ 64 int o_directory; /* output file is a directory */ 65 char *o_filename; /* name of output file */ 66 int o_stdout; /* output file is stdout */ 67 int once_flag; /* -1: stop at first successful file */ 68 int p_flag; /* -[Pp]: use passive FTP */ 69 int R_flag; /* -R: don't delete partially transferred files */ 70 int r_flag; /* -r: restart previously interrupted transfer */ 71 u_int T_secs = 0; /* -T: transfer timeout in seconds */ 72 int s_flag; /* -s: show size, don't fetch */ 73 off_t S_size; /* -S: require size to match */ 74 int t_flag; /*! -t: workaround TCP bug */ 75 int v_level = 1; /* -v: verbosity level */ 76 int v_tty; /* stdout is a tty */ 77 u_int w_secs; /* -w: retry delay */ 78 int family = PF_UNSPEC; /* -[46]: address family to use */ 79 80 int sigalrm; /* SIGALRM received */ 81 int sigint; /* SIGINT received */ 82 83 u_int ftp_timeout; /* default timeout for FTP transfers */ 84 u_int http_timeout; /* default timeout for HTTP transfers */ 85 u_char *buf; /* transfer buffer */ 86 87 88 void 89 sig_handler(int sig) 90 { 91 switch (sig) { 92 case SIGALRM: 93 sigalrm = 1; 94 break; 95 case SIGINT: 96 sigint = 1; 97 break; 98 } 99 } 100 101 struct xferstat { 102 char name[40]; 103 struct timeval start; 104 struct timeval end; 105 struct timeval last; 106 off_t size; 107 off_t offset; 108 off_t rcvd; 109 }; 110 111 void 112 stat_display(struct xferstat *xs, int force) 113 { 114 struct timeval now; 115 116 if (!v_tty || !v_level) 117 return; 118 119 gettimeofday(&now, NULL); 120 if (!force && now.tv_sec <= xs->last.tv_sec) 121 return; 122 xs->last = now; 123 124 fprintf(stderr, "\rReceiving %s", xs->name); 125 if (xs->size == -1) 126 fprintf(stderr, ": %lld bytes", xs->rcvd); 127 else 128 fprintf(stderr, " (%lld bytes): %d%%", xs->size, 129 (int)((100.0 * xs->rcvd) / xs->size)); 130 } 131 132 void 133 stat_start(struct xferstat *xs, char *name, off_t size, off_t offset) 134 { 135 snprintf(xs->name, sizeof xs->name, "%s", name); 136 gettimeofday(&xs->start, NULL); 137 xs->last.tv_sec = xs->last.tv_usec = 0; 138 xs->end = xs->last; 139 xs->size = size; 140 xs->offset = offset; 141 xs->rcvd = offset; 142 stat_display(xs, 1); 143 } 144 145 void 146 stat_update(struct xferstat *xs, off_t rcvd, int force) 147 { 148 xs->rcvd = rcvd; 149 stat_display(xs, 0); 150 } 151 152 void 153 stat_end(struct xferstat *xs) 154 { 155 double delta; 156 double bps; 157 158 if (!v_level) 159 return; 160 161 gettimeofday(&xs->end, NULL); 162 163 stat_display(xs, 1); 164 fputc('\n', stderr); 165 delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6)) 166 - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6)); 167 fprintf(stderr, "%lld bytes transferred in %.1f seconds ", 168 xs->rcvd - xs->offset, delta); 169 bps = (xs->rcvd - xs->offset) / delta; 170 if (bps > 1024*1024) 171 fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024)); 172 else if (bps > 1024) 173 fprintf(stderr, "(%.2f kBps)\n", bps / 1024); 174 else 175 fprintf(stderr, "(%.2f Bps)\n", bps); 176 } 177 178 int 179 fetch(char *URL, char *path) 180 { 181 struct url *url; 182 struct url_stat us; 183 struct stat sb; 184 struct xferstat xs; 185 FILE *f, *of; 186 size_t size; 187 off_t count; 188 char flags[8]; 189 int n, r; 190 u_int timeout; 191 192 f = of = NULL; 193 194 /* parse URL */ 195 if ((url = fetchParseURL(URL)) == NULL) { 196 warnx("%s: parse error", URL); 197 goto failure; 198 } 199 200 timeout = 0; 201 *flags = 0; 202 count = 0; 203 204 /* common flags */ 205 if (v_level > 1) 206 strcat(flags, "v"); 207 switch (family) { 208 case PF_INET: 209 strcat(flags, "4"); 210 break; 211 case PF_INET6: 212 strcat(flags, "6"); 213 break; 214 } 215 216 /* FTP specific flags */ 217 if (strcmp(url->scheme, "ftp") == 0) { 218 if (p_flag) 219 strcat(flags, "p"); 220 if (d_flag) 221 strcat(flags, "d"); 222 if (H_flag) 223 strcat(flags, "h"); 224 timeout = T_secs ? T_secs : ftp_timeout; 225 } 226 227 /* HTTP specific flags */ 228 if (strcmp(url->scheme, "http") == 0) { 229 if (d_flag) 230 strcat(flags, "d"); 231 if (A_flag) 232 strcat(flags, "A"); 233 timeout = T_secs ? T_secs : http_timeout; 234 } 235 236 /* set the protocol timeout. */ 237 fetchTimeout = timeout; 238 239 /* just print size */ 240 if (s_flag) { 241 if (fetchStat(url, &us, flags) == -1) 242 goto failure; 243 if (us.size == -1) 244 printf("Unknown\n"); 245 else 246 printf("%lld\n", us.size); 247 goto success; 248 } 249 250 /* 251 * If the -r flag was specified, we have to compare the local and 252 * remote files, so we should really do a fetchStat() first, but I 253 * know of at least one HTTP server that only sends the content 254 * size in response to GET requests, and leaves it out of replies 255 * to HEAD requests. Also, in the (frequent) case that the local 256 * and remote files match but the local file is truncated, we have 257 * sufficient information *before* the compare to issue a correct 258 * request. Therefore, we always issue a GET request as if we were 259 * sure the local file was a truncated copy of the remote file; we 260 * can drop the connection later if we change our minds. 261 */ 262 if (r_flag && !o_stdout && stat(path, &sb) != -1) 263 url->offset = sb.st_size; 264 else 265 sb.st_size = 0; 266 267 /* start the transfer */ 268 if ((f = fetchXGet(url, &us, flags)) == NULL) { 269 warnx("%s: %s", path, fetchLastErrString); 270 goto failure; 271 } 272 if (sigint) 273 goto signal; 274 275 /* check that size is as expected */ 276 if (S_size) { 277 if (us.size == -1) { 278 warnx("%s: size unknown", path); 279 goto failure; 280 } else if (us.size != S_size) { 281 warnx("%s: size mismatch: expected %lld, actual %lld", 282 path, S_size, us.size); 283 goto failure; 284 } 285 } 286 287 /* symlink instead of copy */ 288 if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) { 289 if (symlink(url->doc, path) == -1) { 290 warn("%s: symlink()", path); 291 goto failure; 292 } 293 goto success; 294 } 295 296 if (v_level > 1) { 297 if (sb.st_size) 298 warnx("local: %lld / %ld", sb.st_size, sb.st_mtime); 299 warnx("remote: %lld / %ld", us.size, us.mtime); 300 } 301 302 /* open output file */ 303 if (o_stdout) { 304 /* output to stdout */ 305 of = stdout; 306 } else if (sb.st_size) { 307 /* resume mode, local file exists */ 308 if (!F_flag && us.mtime && sb.st_mtime != us.mtime) { 309 /* no match! have to refetch */ 310 fclose(f); 311 url->offset = 0; 312 if ((f = fetchXGet(url, &us, flags)) == NULL) { 313 warnx("%s: %s", path, fetchLastErrString); 314 goto failure; 315 } 316 if (sigint) 317 goto signal; 318 } else { 319 if (us.size == sb.st_size) 320 /* nothing to do */ 321 goto success; 322 if (sb.st_size > us.size) { 323 /* local file too long! */ 324 warnx("%s: local file (%lld bytes) is longer " 325 "than remote file (%lld bytes)", 326 path, sb.st_size, us.size); 327 goto failure; 328 } 329 /* we got through, open local file and seek to offset */ 330 /* 331 * XXX there's a race condition here - the file we open is not 332 * necessarily the same as the one we stat()'ed earlier... 333 */ 334 if ((of = fopen(path, "a")) == NULL) { 335 warn("%s: fopen()", path); 336 goto failure; 337 } 338 if (fseek(of, url->offset, SEEK_SET) == -1) { 339 warn("%s: fseek()", path); 340 goto failure; 341 } 342 } 343 } 344 if (m_flag && stat(path, &sb) != -1) { 345 /* mirror mode, local file exists */ 346 if (sb.st_size == us.size && sb.st_mtime == us.mtime) 347 goto success; 348 } 349 if (!of) { 350 /* 351 * We don't yet have an output file; either this is a vanilla 352 * run with no special flags, or the local and remote files 353 * didn't match. 354 */ 355 if ((of = fopen(path, "w")) == NULL) { 356 warn("%s: open()", path); 357 goto failure; 358 } 359 } 360 count = url->offset; 361 362 /* start the counter */ 363 stat_start(&xs, path, us.size, count); 364 365 sigint = sigalrm = 0; 366 367 /* suck in the data */ 368 for (n = 0; !sigint && !sigalrm; ++n) { 369 if (us.size != -1 && us.size - count < B_size) 370 size = us.size - count; 371 else 372 size = B_size; 373 if (timeout) 374 alarm(timeout); 375 if ((size = fread(buf, 1, size, f)) <= 0) 376 break; 377 stat_update(&xs, count += size, 0); 378 if (fwrite(buf, size, 1, of) != 1) 379 break; 380 } 381 382 if (timeout) 383 alarm(0); 384 385 stat_end(&xs); 386 387 /* Set mtime of local file */ 388 if (!n_flag && us.mtime && !o_stdout) { 389 struct timeval tv[2]; 390 391 fflush(of); 392 tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime); 393 tv[1].tv_sec = (long)us.mtime; 394 tv[0].tv_usec = tv[1].tv_usec = 0; 395 if (utimes(path, tv)) 396 warn("%s: utimes()", path); 397 } 398 399 /* timed out or interrupted? */ 400 signal: 401 if (sigalrm) 402 warnx("transfer timed out"); 403 if (sigint) { 404 warnx("transfer interrupted"); 405 goto failure; 406 } 407 408 if (!sigalrm) { 409 /* check the status of our files */ 410 if (ferror(f)) 411 warn("%s", URL); 412 if (ferror(of)) 413 warn("%s", path); 414 if (ferror(f) || ferror(of)) 415 goto failure; 416 } 417 418 /* did the transfer complete normally? */ 419 if (us.size != -1 && count < us.size) { 420 warnx("%s appears to be truncated: %lld/%lld bytes", 421 path, count, us.size); 422 goto failure_keep; 423 } 424 425 success: 426 r = 0; 427 goto done; 428 failure: 429 if (of && of != stdout && !R_flag && !r_flag) 430 unlink(path); 431 failure_keep: 432 r = -1; 433 goto done; 434 done: 435 if (f) 436 fclose(f); 437 if (of && of != stdout) 438 fclose(of); 439 if (url) 440 fetchFreeURL(url); 441 return r; 442 } 443 444 void 445 usage(void) 446 { 447 /* XXX badly out of synch */ 448 fprintf(stderr, 449 "Usage: fetch [-1AFHMPRabdlmnpqrstv] [-o outputfile] [-S bytes]\n" 450 " [-B bytes] [-T seconds] [-w seconds]\n" 451 " [-f file -h host [-c dir] | URL ...]\n" 452 ); 453 } 454 455 456 #define PARSENUM(NAME, TYPE) \ 457 int \ 458 NAME(char *s, TYPE *v) \ 459 { \ 460 *v = 0; \ 461 for (*v = 0; *s; s++) \ 462 if (isdigit(*s)) \ 463 *v = *v * 10 + *s - '0'; \ 464 else \ 465 return -1; \ 466 return 0; \ 467 } 468 469 PARSENUM(parseint, u_int) 470 PARSENUM(parsesize, size_t) 471 PARSENUM(parseoff, off_t) 472 473 int 474 main(int argc, char *argv[]) 475 { 476 struct stat sb; 477 struct sigaction sa; 478 char *p, *q, *s; 479 int c, e, r; 480 481 while ((c = getopt(argc, argv, 482 "146AaB:bc:dFf:h:lHMmnPpo:qRrS:sT:tvw:")) != EOF) 483 switch (c) { 484 case '1': 485 once_flag = 1; 486 break; 487 case '4': 488 family = PF_INET; 489 break; 490 case '6': 491 family = PF_INET6; 492 break; 493 case 'A': 494 A_flag = 1; 495 break; 496 case 'a': 497 a_flag = 1; 498 break; 499 case 'B': 500 if (parsesize(optarg, &B_size) == -1) 501 errx(1, "invalid buffer size"); 502 break; 503 case 'b': 504 warnx("warning: the -b option is deprecated"); 505 b_flag = 1; 506 break; 507 case 'c': 508 c_dirname = optarg; 509 break; 510 case 'd': 511 d_flag = 1; 512 break; 513 case 'F': 514 F_flag = 1; 515 break; 516 case 'f': 517 f_filename = optarg; 518 break; 519 case 'H': 520 H_flag = 1; 521 break; 522 case 'h': 523 h_hostname = optarg; 524 break; 525 case 'l': 526 l_flag = 1; 527 break; 528 case 'o': 529 o_flag = 1; 530 o_filename = optarg; 531 break; 532 case 'M': 533 case 'm': 534 if (r_flag) 535 errx(1, "the -m and -r flags are mutually exclusive"); 536 m_flag = 1; 537 break; 538 case 'n': 539 n_flag = 1; 540 break; 541 case 'P': 542 case 'p': 543 p_flag = 1; 544 break; 545 case 'q': 546 v_level = 0; 547 break; 548 case 'R': 549 R_flag = 1; 550 break; 551 case 'r': 552 if (m_flag) 553 errx(1, "the -m and -r flags are mutually exclusive"); 554 r_flag = 1; 555 break; 556 case 'S': 557 if (parseoff(optarg, &S_size) == -1) 558 errx(1, "invalid size"); 559 break; 560 case 's': 561 s_flag = 1; 562 break; 563 case 'T': 564 if (parseint(optarg, &T_secs) == -1) 565 errx(1, "invalid timeout"); 566 break; 567 case 't': 568 t_flag = 1; 569 warnx("warning: the -t option is deprecated"); 570 break; 571 case 'v': 572 v_level++; 573 break; 574 case 'w': 575 a_flag = 1; 576 if (parseint(optarg, &w_secs) == -1) 577 errx(1, "invalid delay"); 578 break; 579 default: 580 usage(); 581 exit(EX_USAGE); 582 } 583 584 argc -= optind; 585 argv += optind; 586 587 if (h_hostname || f_filename || c_dirname) { 588 if (!h_hostname || !f_filename || argc) { 589 usage(); 590 exit(EX_USAGE); 591 } 592 /* XXX this is a hack. */ 593 if (strcspn(h_hostname, "@:/") != strlen(h_hostname)) 594 errx(1, "invalid hostname"); 595 if (asprintf(argv, "ftp://%s/%s/%s", h_hostname, 596 c_dirname ? c_dirname : "", f_filename) == -1) 597 errx(1, strerror(ENOMEM)); 598 argc++; 599 } 600 601 if (!argc) { 602 usage(); 603 exit(EX_USAGE); 604 } 605 606 /* allocate buffer */ 607 if (B_size < MINBUFSIZE) 608 B_size = MINBUFSIZE; 609 if ((buf = malloc(B_size)) == NULL) 610 errx(1, strerror(ENOMEM)); 611 612 /* timeouts */ 613 if ((s = getenv("FTP_TIMEOUT")) != NULL) { 614 if (parseint(s, &ftp_timeout) == -1) { 615 warnx("FTP_TIMEOUT is not a positive integer"); 616 ftp_timeout = 0; 617 } 618 } 619 if ((s = getenv("HTTP_TIMEOUT")) != NULL) { 620 if (parseint(s, &http_timeout) == -1) { 621 warnx("HTTP_TIMEOUT is not a positive integer"); 622 http_timeout = 0; 623 } 624 } 625 626 /* signal handling */ 627 sa.sa_flags = 0; 628 sa.sa_handler = sig_handler; 629 sigemptyset(&sa.sa_mask); 630 sigaction(SIGALRM, &sa, NULL); 631 sa.sa_flags = SA_RESETHAND; 632 sigaction(SIGINT, &sa, NULL); 633 fetchRestartCalls = 0; 634 635 /* output file */ 636 if (o_flag) { 637 if (strcmp(o_filename, "-") == 0) { 638 o_stdout = 1; 639 } else if (stat(o_filename, &sb) == -1) { 640 if (errno == ENOENT) { 641 if (argc > 1) 642 errx(EX_USAGE, "%s is not a directory", o_filename); 643 } else { 644 err(EX_IOERR, "%s", o_filename); 645 } 646 } else { 647 if (sb.st_mode & S_IFDIR) 648 o_directory = 1; 649 } 650 } 651 652 /* check if output is to a tty (for progress report) */ 653 v_tty = isatty(STDERR_FILENO); 654 r = 0; 655 656 while (argc) { 657 if ((p = strrchr(*argv, '/')) == NULL) 658 p = *argv; 659 else 660 p++; 661 662 if (!*p) 663 p = "fetch.out"; 664 665 fetchLastErrCode = 0; 666 667 if (o_flag) { 668 if (o_stdout) { 669 e = fetch(*argv, "-"); 670 } else if (o_directory) { 671 asprintf(&q, "%s/%s", o_filename, p); 672 e = fetch(*argv, q); 673 free(q); 674 } else { 675 e = fetch(*argv, o_filename); 676 } 677 } else { 678 e = fetch(*argv, p); 679 } 680 681 if (sigint) 682 kill(getpid(), SIGINT); 683 684 if (e == 0 && once_flag) 685 exit(0); 686 687 if (e) { 688 r = 1; 689 if ((fetchLastErrCode 690 && fetchLastErrCode != FETCH_UNAVAIL 691 && fetchLastErrCode != FETCH_MOVED 692 && fetchLastErrCode != FETCH_URL 693 && fetchLastErrCode != FETCH_RESOLV 694 && fetchLastErrCode != FETCH_UNKNOWN)) { 695 if (w_secs) { 696 if (v_level) 697 fprintf(stderr, "Waiting %d seconds before retrying\n", 698 w_secs); 699 sleep(w_secs); 700 } 701 if (a_flag) 702 continue; 703 } 704 } 705 706 argc--, argv++; 707 } 708 709 exit(r); 710 } 711