usr.bin/fetch/fetch.c

   1 /*-
   2  * Copyright (c) 2000-2004 Dag-Erling Coïdan Smørgrav
   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: src/usr.bin/fetch/fetch.c,v 1.84 2009/01/17 13:34:56 des Exp $
  29  * $DragonFly: src/usr.bin/fetch/fetch.c,v 1.8 2007/08/05 21:48:12 swildner Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/socket.h>
  34 #include <sys/stat.h>
  35 #include <sys/time.h>
  36
  37 #include <ctype.h>
  38 #include <err.h>
  39 #include <errno.h>
  40 #include <signal.h>
  41 #include <stdint.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <termios.h>
  46 #include <unistd.h>
  47
  48 #include <fetch.h>
  49
  50 #define MINBUFSIZE      4096
  51 #define TIMEOUT         120
  52
  53 /* Option flags */
  54 int      A_flag;        /*    -A: do not follow 302 redirects */
  55 int      a_flag;        /*    -a: auto retry */
  56 off_t    B_size;        /*    -B: buffer size */
  57 int      b_flag;        /*!   -b: workaround TCP bug */
  58 char    *c_dirname;     /*    -c: remote directory */
  59 int      d_flag;        /*    -d: direct connection */
  60 int      F_flag;        /*    -F: restart without checking mtime  */
  61 char    *f_filename;    /*    -f: file to fetch */
  62 char    *h_hostname;    /*    -h: host to fetch from */
  63 int      i_flag;        /*    -i: specify input file for mtime comparison */
  64 char    *i_filename;    /*        name of input file */
  65 int      l_flag;        /*    -l: link rather than copy file: URLs */
  66 int      m_flag;        /* -[Mm]: mirror mode */
  67 char    *N_filename;    /*    -N: netrc file name */
  68 int      n_flag;        /*    -n: do not preserve modification time */
  69 int      o_flag;        /*    -o: specify output file */
  70 int      o_directory;   /*        output file is a directory */
  71 char    *o_filename;    /*        name of output file */
  72 int      o_stdout;      /*        output file is stdout */
  73 int      once_flag;     /*    -1: stop at first successful file */
  74 int      p_flag;        /* -[Pp]: use passive FTP */
  75 int      R_flag;        /*    -R: don't delete partially transferred files */
  76 int      r_flag;        /*    -r: restart previously interrupted transfer */
  77 off_t    S_size;        /*    -S: require size to match */
  78 int      s_flag;        /*    -s: show size, don't fetch */
  79 long     T_secs;        /*    -T: transfer timeout in seconds */
  80 int      t_flag;        /*!   -t: workaround TCP bug */
  81 int      U_flag;        /*    -U: do not use high ports */
  82 int      v_level = 1;   /*    -v: verbosity level */
  83 int      v_tty;         /*        stdout is a tty */
  84 pid_t    pgrp;          /*        our process group */
  85 long     w_secs;        /*    -w: retry delay */
  86 int      family = PF_UNSPEC;    /* -[46]: address family to use */
  87
  88 int      sigalrm;       /* SIGALRM received */
  89 int      siginfo;       /* SIGINFO received */
  90 int      sigint;        /* SIGINT received */
  91
  92 long     ftp_timeout = TIMEOUT;         /* default timeout for FTP transfers */
  93 long     http_timeout = TIMEOUT;        /* default timeout for HTTP transfers */
  94 char    *buf;           /* transfer buffer */
  95
  96
  97 /*
  98  * Signal handler
  99  */
 100 static void
 101 sig_handler(int sig)
 102 {
 103         switch (sig) {
 104         case SIGALRM:
 105                 sigalrm = 1;
 106                 break;
 107         case SIGINFO:
 108                 siginfo = 1;
 109                 break;
 110         case SIGINT:
 111                 sigint = 1;
 112                 break;
 113         }
 114 }
 115
 116 struct xferstat {
 117         char             name[64];
 118         struct timeval   start;
 119         struct timeval   last;
 120         off_t            size;
 121         off_t            offset;
 122         off_t            rcvd;
 123 };
 124
 125 /*
 126  * Compute and display ETA
 127  */
 128 static const char *
 129 stat_eta(struct xferstat *xs)
 130 {
 131         static char str[16];
 132         long elapsed, eta;
 133         off_t received, expected;
 134
 135         elapsed = xs->last.tv_sec - xs->start.tv_sec;
 136         received = xs->rcvd - xs->offset;
 137         expected = xs->size - xs->rcvd;
 138         eta = (long)((double)elapsed * expected / received);
 139         if (eta > 3600)
 140                 snprintf(str, sizeof str, "%02ldh%02ldm",
 141                     eta / 3600, (eta % 3600) / 60);
 142         else
 143                 snprintf(str, sizeof str, "%02ldm%02lds",
 144                     eta / 60, eta % 60);
 145         return (str);
 146 }
 147
 148 /*
 149  * Format a number as "xxxx YB" where Y is ' ', 'k', 'M'...
 150  */
 151 static const char *prefixes = " kMGTP";
 152 static const char *
 153 stat_bytes(off_t bytes)
 154 {
 155         static char str[16];
 156         const char *prefix = prefixes;
 157
 158         while (bytes > 9999 && prefix[1] != '\0') {
 159                 bytes /= 1024;
 160                 prefix++;
 161         }
 162         snprintf(str, sizeof str, "%4jd %cB", (intmax_t)bytes, *prefix);
 163         return (str);
 164 }
 165
 166 /*
 167  * Compute and display transfer rate
 168  */
 169 static const char *
 170 stat_bps(struct xferstat *xs)
 171 {
 172         static char str[16];
 173         double delta, bps;
 174
 175         delta = (xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
 176             - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
 177         if (delta == 0.0) {
 178                 snprintf(str, sizeof str, "?? Bps");
 179         } else {
 180                 bps = (xs->rcvd - xs->offset) / delta;
 181                 snprintf(str, sizeof str, "%sps", stat_bytes((off_t)bps));
 182         }
 183         return (str);
 184 }
 185
 186 /*
 187  * Update the stats display
 188  */
 189 static void
 190 stat_display(struct xferstat *xs, int force)
 191 {
 192         struct timeval now;
 193         int ctty_pgrp;
 194
 195         /* check if we're the foreground process */
 196         if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
 197             (pid_t)ctty_pgrp != pgrp)
 198                 return;
 199
 200         gettimeofday(&now, NULL);
 201         if (!force && now.tv_sec <= xs->last.tv_sec)
 202                 return;
 203         xs->last = now;
 204
 205         fprintf(stderr, "\r%-46.46s", xs->name);
 206         if (xs->size <= 0) {
 207                 setproctitle("%s [%s]", xs->name, stat_bytes(xs->rcvd));
 208                 fprintf(stderr, "        %s", stat_bytes(xs->rcvd));
 209         } else {
 210                 setproctitle("%s [%d%% of %s]", xs->name,
 211                     (int)((100.0 * xs->rcvd) / xs->size),
 212                     stat_bytes(xs->size));
 213                 fprintf(stderr, "%3d%% of %s",
 214                     (int)((100.0 * xs->rcvd) / xs->size),
 215                     stat_bytes(xs->size));
 216         }
 217         fprintf(stderr, " %s", stat_bps(xs));
 218         if (xs->size > 0 && xs->rcvd > 0 &&
 219             xs->last.tv_sec >= xs->start.tv_sec + 10)
 220                 fprintf(stderr, " %s", stat_eta(xs));
 221 }
 222
 223 /*
 224  * Initialize the transfer statistics
 225  */
 226 static void
 227 stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
 228 {
 229         snprintf(xs->name, sizeof xs->name, "%s", name);
 230         gettimeofday(&xs->start, NULL);
 231         xs->last.tv_sec = xs->last.tv_usec = 0;
 232         xs->size = size;
 233         xs->offset = offset;
 234         xs->rcvd = offset;
 235         if (v_tty && v_level > 0)
 236                 stat_display(xs, 1);
 237         else if (v_level > 0)
 238                 fprintf(stderr, "%-46s", xs->name);
 239 }
 240
 241 /*
 242  * Update the transfer statistics
 243  */
 244 static void
 245 stat_update(struct xferstat *xs, off_t rcvd)
 246 {
 247         xs->rcvd = rcvd;
 248         if (v_tty && v_level > 0)
 249                 stat_display(xs, 0);
 250 }
 251
 252 /*
 253  * Finalize the transfer statistics
 254  */
 255 static void
 256 stat_end(struct xferstat *xs)
 257 {
 258         gettimeofday(&xs->last, NULL);
 259         if (v_tty && v_level > 0) {
 260                 stat_display(xs, 1);
 261                 putc('\n', stderr);
 262         } else if (v_level > 0) {
 263                 fprintf(stderr, "        %s %s\n",
 264                     stat_bytes(xs->size), stat_bps(xs));
 265         }
 266 }
 267
 268 /*
 269  * Ask the user for authentication details
 270  */
 271 static int
 272 query_auth(struct url *URL)
 273 {
 274         struct termios tios;
 275         tcflag_t saved_flags;
 276         int i, nopwd;
 277
 278         fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
 279             URL->scheme, URL->host, URL->port);
 280
 281         fprintf(stderr, "Login: ");
 282         if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
 283                 return (-1);
 284         for (i = strlen(URL->user); i >= 0; --i)
 285                 if (URL->user[i] == '\r' || URL->user[i] == '\n')
 286                         URL->user[i] = '\0';
 287
 288         fprintf(stderr, "Password: ");
 289         if (tcgetattr(STDIN_FILENO, &tios) == 0) {
 290                 saved_flags = tios.c_lflag;
 291                 tios.c_lflag &= ~ECHO;
 292                 tios.c_lflag |= ECHONL|ICANON;
 293                 tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
 294                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 295                 tios.c_lflag = saved_flags;
 296                 tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
 297         } else {
 298                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 299         }
 300         if (nopwd)
 301                 return (-1);
 302         for (i = strlen(URL->pwd); i >= 0; --i)
 303                 if (URL->pwd[i] == '\r' || URL->pwd[i] == '\n')
 304                         URL->pwd[i] = '\0';
 305
 306         return (0);
 307 }
 308
 309 /*
 310  * Fetch a file
 311  */
 312 static int
 313 fetch(char *URL, const char *path)
 314 {
 315         struct url *url;
 316         struct url_stat us;
 317         struct stat sb, nsb;
 318         struct xferstat xs;
 319         FILE *f, *of;
 320         size_t size, wr;
 321         off_t count;
 322         char flags[8];
 323         const char *slash;
 324         char *tmppath;
 325         int r;
 326         unsigned timeout;
 327         char *ptr;
 328
 329         f = of = NULL;
 330         tmppath = NULL;
 331
 332         timeout = 0;
 333         *flags = 0;
 334         count = 0;
 335
 336         /* set verbosity level */
 337         if (v_level > 1)
 338                 strcat(flags, "v");
 339         if (v_level > 2)
 340                 fetchDebug = 1;
 341
 342         /* parse URL */
 343         if ((url = fetchParseURL(URL)) == NULL) {
 344                 warnx("%s: parse error", URL);
 345                 goto failure;
 346         }
 347
 348         /* if no scheme was specified, take a guess */
 349         if (*url->scheme == 0) {
 350                 if (*url->host == 0)
 351                         strcpy(url->scheme, SCHEME_FILE);
 352                 else if (strncasecmp(url->host, "ftp.", 4) == 0)
 353                         strcpy(url->scheme, SCHEME_FTP);
 354                 else if (strncasecmp(url->host, "www.", 4) == 0)
 355                         strcpy(url->scheme, SCHEME_HTTP);
 356         }
 357
 358         /* common flags */
 359         switch (family) {
 360         case PF_INET:
 361                 strcat(flags, "4");
 362                 break;
 363         case PF_INET6:
 364                 strcat(flags, "6");
 365                 break;
 366         }
 367
 368         /* FTP specific flags */
 369         if (strcmp(url->scheme, SCHEME_FTP) == 0) {
 370                 if (p_flag)
 371                         strcat(flags, "p");
 372                 if (d_flag)
 373                         strcat(flags, "d");
 374                 if (U_flag)
 375                         strcat(flags, "l");
 376                 timeout = T_secs ? T_secs : ftp_timeout;
 377         }
 378
 379         /* HTTP specific flags */
 380         if (strcmp(url->scheme, SCHEME_HTTP) == 0 ||
 381             strcmp(url->scheme, SCHEME_HTTPS) == 0) {
 382                 if (d_flag)
 383                         strcat(flags, "d");
 384                 if (A_flag)
 385                         strcat(flags, "A");
 386                 timeout = T_secs ? T_secs : http_timeout;
 387                 if (i_flag) {
 388                         if (stat(i_filename, &sb)) {
 389                                 warn("%s: stat()", i_filename);
 390                                 goto failure;
 391                         }
 392                         url->ims_time = sb.st_mtime;
 393                         strcat(flags, "i");
 394                 }
 395         }
 396
 397         /* set the protocol timeout. */
 398         fetchTimeout = timeout;
 399
 400         /* just print size */
 401         if (s_flag) {
 402                 if (timeout)
 403                         alarm(timeout);
 404                 r = fetchStat(url, &us, flags);
 405                 if (timeout)
 406                         alarm(0);
 407                 if (sigalrm || sigint)
 408                         goto signal;
 409                 if (r == -1) {
 410                         warnx("%s", fetchLastErrString);
 411                         goto failure;
 412                 }
 413                 if (us.size == -1)
 414                         printf("Unknown\n");
 415                 else
 416                         printf("%jd\n", (intmax_t)us.size);
 417                 goto success;
 418         }
 419
 420         /*
 421          * If the -r flag was specified, we have to compare the local
 422          * and remote files, so we should really do a fetchStat()
 423          * first, but I know of at least one HTTP server that only
 424          * sends the content size in response to GET requests, and
 425          * leaves it out of replies to HEAD requests.  Also, in the
 426          * (frequent) case that the local and remote files match but
 427          * the local file is truncated, we have sufficient information
 428          * before the compare to issue a correct request.  Therefore,
 429          * we always issue a GET request as if we were sure the local
 430          * file was a truncated copy of the remote file; we can drop
 431          * the connection later if we change our minds.
 432          */
 433         sb.st_size = -1;
 434         if (!o_stdout) {
 435                 r = stat(path, &sb);
 436                 if (r == 0 && r_flag && S_ISREG(sb.st_mode)) {
 437                         url->offset = sb.st_size;
 438                 } else if (r == -1 || !S_ISREG(sb.st_mode)) {
 439                         /*
 440                          * Whatever value sb.st_size has now is either
 441                          * wrong (if stat(2) failed) or irrelevant (if the
 442                          * path does not refer to a regular file)
 443                          */
 444                         sb.st_size = -1;
 445                 }
 446                 if (r == -1 && errno != ENOENT) {
 447                         warnx("%s: stat()", path);
 448                         goto failure;
 449                 }
 450         }
 451
 452         /* start the transfer */
 453         if (timeout)
 454                 alarm(timeout);
 455         f = fetchXGet(url, &us, flags);
 456         if (timeout)
 457                 alarm(0);
 458         if (sigalrm || sigint)
 459                 goto signal;
 460         if (f == NULL) {
 461                 warnx("%s: %s", URL, fetchLastErrString);
 462                 if (i_flag && strcmp(url->scheme, SCHEME_HTTP) == 0
 463                     && fetchLastErrCode == FETCH_OK
 464                     && strcmp(fetchLastErrString, "Not Modified") == 0) {
 465                         /* HTTP Not Modified Response, return OK. */
 466                         r = 0;
 467                         goto done;
 468                 } else
 469                         goto failure;
 470         }
 471         if (sigint)
 472                 goto signal;
 473
 474         /* check that size is as expected */
 475         if (S_size) {
 476                 if (us.size == -1) {
 477                         warnx("%s: size unknown", URL);
 478                 } else if (us.size != S_size) {
 479                         warnx("%s: size mismatch: expected %jd, actual %jd",
 480                             URL, (intmax_t)S_size, (intmax_t)us.size);
 481                         goto failure;
 482                 }
 483         }
 484
 485         /* symlink instead of copy */
 486         if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
 487                 if (symlink(url->doc, path) == -1) {
 488                         warn("%s: symlink()", path);
 489                         goto failure;
 490                 }
 491                 goto success;
 492         }
 493
 494         if (us.size == -1 && !o_stdout && v_level > 0)
 495                 warnx("%s: size of remote file is not known", URL);
 496         if (v_level > 1) {
 497                 if (sb.st_size != -1)
 498                         fprintf(stderr, "local size / mtime: %jd / %ld\n",
 499                             (intmax_t)sb.st_size, (long)sb.st_mtime);
 500                 if (us.size != -1)
 501                         fprintf(stderr, "remote size / mtime: %jd / %ld\n",
 502                             (intmax_t)us.size, (long)us.mtime);
 503         }
 504
 505         /* open output file */
 506         if (o_stdout) {
 507                 /* output to stdout */
 508                 of = stdout;
 509         } else if (r_flag && sb.st_size != -1) {
 510                 /* resume mode, local file exists */
 511                 if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
 512                         /* no match! have to refetch */
 513                         fclose(f);
 514                         /* if precious, warn the user and give up */
 515                         if (R_flag) {
 516                                 warnx("%s: local modification time "
 517                                     "does not match remote", path);
 518                                 goto failure_keep;
 519                         }
 520                 } else if (us.size != -1) {
 521                         if (us.size == sb.st_size)
 522                                 /* nothing to do */
 523                                 goto success;
 524                         if (sb.st_size > us.size) {
 525                                 /* local file too long! */
 526                                 warnx("%s: local file (%jd bytes) is longer "
 527                                     "than remote file (%jd bytes)", path,
 528                                     (intmax_t)sb.st_size, (intmax_t)us.size);
 529                                 goto failure;
 530                         }
 531                         /* we got it, open local file */
 532                         if ((of = fopen(path, "a")) == NULL) {
 533                                 warn("%s: fopen()", path);
 534                                 goto failure;
 535                         }
 536                         /* check that it didn't move under our feet */
 537                         if (fstat(fileno(of), &nsb) == -1) {
 538                                 /* can't happen! */
 539                                 warn("%s: fstat()", path);
 540                                 goto failure;
 541                         }
 542                         if (nsb.st_dev != sb.st_dev ||
 543                             nsb.st_ino != nsb.st_ino ||
 544                             nsb.st_size != sb.st_size) {
 545                                 warnx("%s: file has changed", URL);
 546                                 fclose(of);
 547                                 of = NULL;
 548                                 sb = nsb;
 549                         }
 550                 }
 551         } else if (m_flag && sb.st_size != -1) {
 552                 /* mirror mode, local file exists */
 553                 if (sb.st_size == us.size && sb.st_mtime == us.mtime)
 554                         goto success;
 555         }
 556
 557         if (of == NULL) {
 558                 /*
 559                  * We don't yet have an output file; either this is a
 560                  * vanilla run with no special flags, or the local and
 561                  * remote files didn't match.
 562                  */
 563
 564                 if (url->offset > 0) {
 565                         /*
 566                          * We tried to restart a transfer, but for
 567                          * some reason gave up - so we have to restart
 568                          * from scratch if we want the whole file
 569                          */
 570                         url->offset = 0;
 571                         if ((f = fetchXGet(url, &us, flags)) == NULL) {
 572                                 warnx("%s: %s", URL, fetchLastErrString);
 573                                 goto failure;
 574                         }
 575                         if (sigint)
 576                                 goto signal;
 577                 }
 578
 579                 /* construct a temporary file name */
 580                 if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
 581                         if ((slash = strrchr(path, '/')) == NULL)
 582                                 slash = path;
 583                         else
 584                                 ++slash;
 585                         asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
 586                             (int)(slash - path), path, slash);
 587                         if (tmppath != NULL) {
 588                                 if (mkstemps(tmppath, strlen(slash)+1) == -1) {
 589                                         warn("%s: mkstemps()", path);
 590                                         goto failure;
 591                                 }
 592
 593                                 of = fopen(tmppath, "w");
 594                                 chown(tmppath, sb.st_uid, sb.st_gid);
 595                                 chmod(tmppath, sb.st_mode & ALLPERMS);
 596                         }
 597                 }
 598
 599                 if (of == NULL)
 600                         if ((of = fopen(path, "w")) == NULL) {
 601                                 warn("%s: fopen()", path);
 602                         goto failure;
 603                 }
 604         }
 605         count = url->offset;
 606
 607         /* start the counter */
 608         stat_start(&xs, path, us.size, count);
 609
 610         sigalrm = siginfo = sigint = 0;
 611
 612         /* suck in the data */
 613         signal(SIGINFO, sig_handler);
 614         while (!sigint) {
 615                 if (us.size != -1 && us.size - count < B_size &&
 616                     us.size - count >= 0)
 617                         size = us.size - count;
 618                 else
 619                         size = B_size;
 620                 if (siginfo) {
 621                         stat_end(&xs);
 622                         siginfo = 0;
 623                 }
 624                 if ((size = fread(buf, 1, size, f)) == 0) {
 625                         if (ferror(f) && errno == EINTR && !sigint)
 626                                 clearerr(f);
 627                         else
 628                                 break;
 629                 }
 630                 stat_update(&xs, count += size);
 631                 for (ptr = buf; size > 0; ptr += wr, size -= wr)
 632                         if ((wr = fwrite(ptr, 1, size, of)) < size) {
 633                                 if (ferror(of) && errno == EINTR && !sigint)
 634                                         clearerr(of);
 635                                 else
 636                                         break;
 637                         }
 638                 if (size != 0)
 639                         break;
 640         }
 641         if (!sigalrm)
 642                 sigalrm = ferror(f) && errno == ETIMEDOUT;
 643         signal(SIGINFO, SIG_DFL);
 644
 645         stat_end(&xs);
 646
 647         /*
 648          * If the transfer timed out or was interrupted, we still want to
 649          * set the mtime in case the file is not removed (-r or -R) and
 650          * the user later restarts the transfer.
 651          */
 652  signal:
 653         /* set mtime of local file */
 654         if (!n_flag && us.mtime && !o_stdout && of != NULL &&
 655             (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
 656                 struct timeval tv[2];
 657
 658                 fflush(of);
 659                 tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
 660                 tv[1].tv_sec = (long)us.mtime;
 661                 tv[0].tv_usec = tv[1].tv_usec = 0;
 662                 if (utimes(tmppath ? tmppath : path, tv))
 663                         warn("%s: utimes()", tmppath ? tmppath : path);
 664         }
 665
 666         /* timed out or interrupted? */
 667         if (sigalrm)
 668                 warnx("transfer timed out");
 669         if (sigint) {
 670                 warnx("transfer interrupted");
 671                 goto failure;
 672         }
 673
 674         /* timeout / interrupt before connection completley established? */
 675         if (f == NULL)
 676                 goto failure;
 677
 678         if (!sigalrm) {
 679                 /* check the status of our files */
 680                 if (ferror(f))
 681                         warn("%s", URL);
 682                 if (ferror(of))
 683                         warn("%s", path);
 684                 if (ferror(f) || ferror(of))
 685                         goto failure;
 686         }
 687
 688         /* did the transfer complete normally? */
 689         if (us.size != -1 && count < us.size) {
 690                 warnx("%s appears to be truncated: %jd/%jd bytes",
 691                     path, (intmax_t)count, (intmax_t)us.size);
 692                 goto failure_keep;
 693         }
 694
 695         /*
 696          * If the transfer timed out and we didn't know how much to
 697          * expect, assume the worst (i.e. we didn't get all of it)
 698          */
 699         if (sigalrm && us.size == -1) {
 700                 warnx("%s may be truncated", path);
 701                 goto failure_keep;
 702         }
 703
 704  success:
 705         r = 0;
 706         if (tmppath != NULL && rename(tmppath, path) == -1) {
 707                 warn("%s: rename()", path);
 708                 goto failure_keep;
 709         }
 710         goto done;
 711  failure:
 712         if (of && of != stdout && !R_flag && !r_flag)
 713                 if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
 714                         unlink(tmppath ? tmppath : path);
 715         if (R_flag && tmppath != NULL && sb.st_size == -1)
 716                 rename(tmppath, path); /* ignore errors here */
 717  failure_keep:
 718         r = -1;
 719         goto done;
 720  done:
 721         if (f)
 722                 fclose(f);
 723         if (of && of != stdout)
 724                 fclose(of);
 725         if (url)
 726                 fetchFreeURL(url);
 727         if (tmppath != NULL)
 728                 free(tmppath);
 729         return (r);
 730 }
 731
 732 static void
 733 usage(void)
 734 {
 735         fprintf(stderr, "%s\n%s\n%s\n%s\n",
 736 "usage: fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [-N file] [-o file] [-S bytes]",
 737 "       [-T seconds] [-w seconds] [-i file] URL ...",
 738 "       fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [-N file] [-o file] [-S bytes]",
 739 "       [-T seconds] [-w seconds] [-i file] -h host -f file [-c dir]");
 740 }
 741
 742
 743 /*
 744  * Entry point
 745  */
 746 int
 747 main(int argc, char *argv[])
 748 {
 749         struct stat sb;
 750         struct sigaction sa;
 751         const char *p, *s;
 752         char *end, *q;
 753         int c, e, r;
 754
 755         while ((c = getopt(argc, argv,
 756             "146AaB:bc:dFf:Hh:i:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
 757                 switch (c) {
 758                 case '1':
 759                         once_flag = 1;
 760                         break;
 761                 case '4':
 762                         family = PF_INET;
 763                         break;
 764                 case '6':
 765                         family = PF_INET6;
 766                         break;
 767                 case 'A':
 768                         A_flag = 1;
 769                         break;
 770                 case 'a':
 771                         a_flag = 1;
 772                         break;
 773                 case 'B':
 774                         B_size = (off_t)strtol(optarg, &end, 10);
 775                         if (*optarg == '\0' || *end != '\0')
 776                                 errx(1, "invalid buffer size (%s)", optarg);
 777                         break;
 778                 case 'b':
 779                         warnx("warning: the -b option is deprecated");
 780                         b_flag = 1;
 781                         break;
 782                 case 'c':
 783                         c_dirname = optarg;
 784                         break;
 785                 case 'd':
 786                         d_flag = 1;
 787                         break;
 788                 case 'F':
 789                         F_flag = 1;
 790                         break;
 791                 case 'f':
 792                         f_filename = optarg;
 793                         break;
 794                 case 'H':
 795                         warnx("the -H option is now implicit, "
 796                             "use -U to disable");
 797                         break;
 798                 case 'h':
 799                         h_hostname = optarg;
 800                         break;
 801                 case 'i':
 802                         i_flag = 1;
 803                         i_filename = optarg;
 804                         break;
 805                 case 'l':
 806                         l_flag = 1;
 807                         break;
 808                 case 'o':
 809                         o_flag = 1;
 810                         o_filename = optarg;
 811                         break;
 812                 case 'M':
 813                 case 'm':
 814                         if (r_flag)
 815                                 errx(1, "the -m and -r flags "
 816                                     "are mutually exclusive");
 817                         m_flag = 1;
 818                         break;
 819                 case 'N':
 820                         N_filename = optarg;
 821                         break;
 822                 case 'n':
 823                         n_flag = 1;
 824                         break;
 825                 case 'P':
 826                 case 'p':
 827                         p_flag = 1;
 828                         break;
 829                 case 'q':
 830                         v_level = 0;
 831                         break;
 832                 case 'R':
 833                         R_flag = 1;
 834                         break;
 835                 case 'r':
 836                         if (m_flag)
 837                                 errx(1, "the -m and -r flags "
 838                                     "are mutually exclusive");
 839                         r_flag = 1;
 840                         break;
 841                 case 'S':
 842                         S_size = (off_t)strtol(optarg, &end, 10);
 843                         if (*optarg == '\0' || *end != '\0')
 844                                 errx(1, "invalid size (%s)", optarg);
 845                         break;
 846                 case 's':
 847                         s_flag = 1;
 848                         break;
 849                 case 'T':
 850                         T_secs = strtol(optarg, &end, 10);
 851                         if (*optarg == '\0' || *end != '\0')
 852                                 errx(1, "invalid timeout (%s)", optarg);
 853                         break;
 854                 case 't':
 855                         t_flag = 1;
 856                         warnx("warning: the -t option is deprecated");
 857                         break;
 858                 case 'U':
 859                         U_flag = 1;
 860                         break;
 861                 case 'v':
 862                         v_level++;
 863                         break;
 864                 case 'w':
 865                         a_flag = 1;
 866                         w_secs = strtol(optarg, &end, 10);
 867                         if (*optarg == '\0' || *end != '\0')
 868                                 errx(1, "invalid delay (%s)", optarg);
 869                         break;
 870                 default:
 871                         usage();
 872                         exit(1);
 873                 }
 874
 875         argc -= optind;
 876         argv += optind;
 877
 878         if (h_hostname || f_filename || c_dirname) {
 879                 if (!h_hostname || !f_filename || argc) {
 880                         usage();
 881                         exit(1);
 882                 }
 883                 /* XXX this is a hack. */
 884                 if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
 885                         errx(1, "invalid hostname");
 886                 if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
 887                     c_dirname ? c_dirname : "", f_filename) == -1)
 888                         errx(1, "%s", strerror(ENOMEM));
 889                 argc++;
 890         }
 891
 892         if (!argc) {
 893                 usage();
 894                 exit(1);
 895         }
 896
 897         /* allocate buffer */
 898         if (B_size < MINBUFSIZE)
 899                 B_size = MINBUFSIZE;
 900         if ((buf = malloc(B_size)) == NULL)
 901                 errx(1, "%s", strerror(ENOMEM));
 902
 903         /* timeouts */
 904         if ((s = getenv("FTP_TIMEOUT")) != NULL) {
 905                 ftp_timeout = strtol(s, &end, 10);
 906                 if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
 907                         warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
 908                         ftp_timeout = 0;
 909                 }
 910         }
 911         if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
 912                 http_timeout = strtol(s, &end, 10);
 913                 if (*s == '\0' || *end != '\0' || http_timeout < 0) {
 914                         warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
 915                         http_timeout = 0;
 916                 }
 917         }
 918
 919         /* signal handling */
 920         sa.sa_flags = 0;
 921         sa.sa_handler = sig_handler;
 922         sigemptyset(&sa.sa_mask);
 923         sigaction(SIGALRM, &sa, NULL);
 924         sa.sa_flags = SA_RESETHAND;
 925         sigaction(SIGINT, &sa, NULL);
 926         fetchRestartCalls = 0;
 927
 928         /* output file */
 929         if (o_flag) {
 930                 if (strcmp(o_filename, "-") == 0) {
 931                         o_stdout = 1;
 932                 } else if (stat(o_filename, &sb) == -1) {
 933                         if (errno == ENOENT) {
 934                                 if (argc > 1)
 935                                         errx(1, "%s is not a directory",
 936                                             o_filename);
 937                         } else {
 938                                 err(1, "%s", o_filename);
 939                         }
 940                 } else {
 941                         if (sb.st_mode & S_IFDIR)
 942                                 o_directory = 1;
 943                 }
 944         }
 945
 946         /* check if output is to a tty (for progress report) */
 947         v_tty = isatty(STDERR_FILENO);
 948         if (v_tty)
 949                 pgrp = getpgrp();
 950
 951         r = 0;
 952
 953         /* authentication */
 954         if (v_tty)
 955                 fetchAuthMethod = query_auth;
 956         if (N_filename != NULL) {
 957                 if (setenv("NETRC", N_filename, 1) == -1)
 958                         err(1, "setenv: cannot set NETRC=%s", N_filename);
 959         }
 960
 961         while (argc) {
 962                 if ((p = strrchr(*argv, '/')) == NULL)
 963                         p = *argv;
 964                 else
 965                         p++;
 966
 967                 if (!*p)
 968                         p = "fetch.out";
 969
 970                 fetchLastErrCode = 0;
 971
 972                 if (o_flag) {
 973                         if (o_stdout) {
 974                                 e = fetch(*argv, "-");
 975                         } else if (o_directory) {
 976                                 asprintf(&q, "%s/%s", o_filename, p);
 977                                 e = fetch(*argv, q);
 978                                 free(q);
 979                         } else {
 980                                 e = fetch(*argv, o_filename);
 981                         }
 982                 } else {
 983                         e = fetch(*argv, p);
 984                 }
 985
 986                 if (sigint)
 987                         kill(getpid(), SIGINT);
 988
 989                 if (e == 0 && once_flag)
 990                         exit(0);
 991
 992                 if (e) {
 993                         r = 1;
 994                         if ((fetchLastErrCode
 995                             && fetchLastErrCode != FETCH_UNAVAIL
 996                             && fetchLastErrCode != FETCH_MOVED
 997                             && fetchLastErrCode != FETCH_URL
 998                             && fetchLastErrCode != FETCH_RESOLV
 999                             && fetchLastErrCode != FETCH_UNKNOWN)) {
1000                                 if (w_secs && v_level)
1001                                         fprintf(stderr, "Waiting %ld seconds "
1002                                             "before retrying\n", w_secs);
1003                                 if (w_secs)
1004                                         sleep(w_secs);
1005                                 if (a_flag)
1006                                         continue;
1007                         }
1008                 }
1009
1010                 argc--, argv++;
1011         }
1012
1013         exit(r);
1014 }