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 1.78 2006/11/10 22:05:41 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 <sysexits.h>
  46 #include <termios.h>
  47 #include <unistd.h>
  48
  49 #include <fetch.h>
  50
  51 #define MINBUFSIZE      4096
  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      l_flag;        /*    -l: link rather than copy file: URLs */
  64 int      m_flag;        /* -[Mm]: mirror mode */
  65 char    *N_filename;    /*    -N: netrc file name */
  66 int      n_flag;        /*    -n: do not preserve modification time */
  67 int      o_flag;        /*    -o: specify output file */
  68 int      o_directory;   /*        output file is a directory */
  69 char    *o_filename;    /*        name of output file */
  70 int      o_stdout;      /*        output file is stdout */
  71 int      once_flag;     /*    -1: stop at first successful file */
  72 int      p_flag;        /* -[Pp]: use passive FTP */
  73 int      R_flag;        /*    -R: don't delete partially transferred files */
  74 int      r_flag;        /*    -r: restart previously interrupted transfer */
  75 off_t    S_size;        /*    -S: require size to match */
  76 int      s_flag;        /*    -s: show size, don't fetch */
  77 long     T_secs = 120;  /*    -T: transfer timeout in seconds */
  78 int      t_flag;        /*!   -t: workaround TCP bug */
  79 int      U_flag;        /*    -U: do not use high ports */
  80 int      v_level = 1;   /*    -v: verbosity level */
  81 int      v_tty;         /*        stdout is a tty */
  82 pid_t    pgrp;          /*        our process group */
  83 long     w_secs;        /*    -w: retry delay */
  84 int      family = PF_UNSPEC;    /* -[46]: address family to use */
  85
  86 int      sigalrm;       /* SIGALRM received */
  87 int      siginfo;       /* SIGINFO received */
  88 int      sigint;        /* SIGINT received */
  89
  90 long     ftp_timeout;   /* default timeout for FTP transfers */
  91 long     http_timeout;  /* default timeout for HTTP transfers */
  92 char    *buf;           /* transfer buffer */
  93
  94
  95 /*
  96  * Signal handler
  97  */
  98 static void
  99 sig_handler(int sig)
 100 {
 101         switch (sig) {
 102         case SIGALRM:
 103                 sigalrm = 1;
 104                 break;
 105         case SIGINFO:
 106                 siginfo = 1;
 107                 break;
 108         case SIGINT:
 109                 sigint = 1;
 110                 break;
 111         }
 112 }
 113
 114 struct xferstat {
 115         char             name[64];
 116         struct timeval   start;
 117         struct timeval   last;
 118         off_t            size;
 119         off_t            offset;
 120         off_t            rcvd;
 121 };
 122
 123 /*
 124  * Compute and display ETA
 125  */
 126 static const char *
 127 stat_eta(struct xferstat *xs)
 128 {
 129         static char str[16];
 130         long elapsed, eta;
 131         off_t received, expected;
 132
 133         elapsed = xs->last.tv_sec - xs->start.tv_sec;
 134         received = xs->rcvd - xs->offset;
 135         expected = xs->size - xs->rcvd;
 136         eta = (long)((double)elapsed * expected / received);
 137         if (eta > 3600)
 138                 snprintf(str, sizeof str, "%02ldh%02ldm",
 139                     eta / 3600, (eta % 3600) / 60);
 140         else
 141                 snprintf(str, sizeof str, "%02ldm%02lds",
 142                     eta / 60, eta % 60);
 143         return (str);
 144 }
 145
 146 /*
 147  * Format a number as "xxxx YB" where Y is ' ', 'k', 'M'...
 148  */
 149 static const char *prefixes = " kMGTP";
 150 static const char *
 151 stat_bytes(off_t bytes)
 152 {
 153         static char str[16];
 154         const char *prefix = prefixes;
 155
 156         while (bytes > 9999 && prefix[1] != '\0') {
 157                 bytes /= 1024;
 158                 prefix++;
 159         }
 160         snprintf(str, sizeof str, "%4jd %cB", (intmax_t)bytes, *prefix);
 161         return (str);
 162 }
 163
 164 /*
 165  * Compute and display transfer rate
 166  */
 167 static const char *
 168 stat_bps(struct xferstat *xs)
 169 {
 170         static char str[16];
 171         double delta, bps;
 172
 173         delta = (xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
 174             - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
 175         if (delta == 0.0) {
 176                 snprintf(str, sizeof str, "?? Bps");
 177         } else {
 178                 bps = (xs->rcvd - xs->offset) / delta;
 179                 snprintf(str, sizeof str, "%sps", stat_bytes((off_t)bps));
 180         }
 181         return (str);
 182 }
 183
 184 /*
 185  * Update the stats display
 186  */
 187 static void
 188 stat_display(struct xferstat *xs, int force)
 189 {
 190         struct timeval now;
 191         int ctty_pgrp;
 192
 193         /* check if we're the foreground process */
 194         if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
 195             (pid_t)ctty_pgrp != pgrp)
 196                 return;
 197
 198         gettimeofday(&now, NULL);
 199         if (!force && now.tv_sec <= xs->last.tv_sec)
 200                 return;
 201         xs->last = now;
 202
 203         fprintf(stderr, "\r%-46.46s", xs->name);
 204         if (xs->size <= 0) {
 205                 setproctitle("%s [%s]", xs->name, stat_bytes(xs->rcvd));
 206                 fprintf(stderr, "        %s", stat_bytes(xs->rcvd));
 207         } else {
 208                 setproctitle("%s [%d%% of %s]", xs->name,
 209                     (int)((100.0 * xs->rcvd) / xs->size),
 210                     stat_bytes(xs->size));
 211                 fprintf(stderr, "%3d%% of %s",
 212                     (int)((100.0 * xs->rcvd) / xs->size),
 213                     stat_bytes(xs->size));
 214         }
 215         fprintf(stderr, " %s", stat_bps(xs));
 216         if (xs->size > 0 && xs->rcvd > 0 &&
 217             xs->last.tv_sec >= xs->start.tv_sec + 10)
 218                 fprintf(stderr, " %s", stat_eta(xs));
 219 }
 220
 221 /*
 222  * Initialize the transfer statistics
 223  */
 224 static void
 225 stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
 226 {
 227         snprintf(xs->name, sizeof xs->name, "%s", name);
 228         gettimeofday(&xs->start, NULL);
 229         xs->last.tv_sec = xs->last.tv_usec = 0;
 230         xs->size = size;
 231         xs->offset = offset;
 232         xs->rcvd = offset;
 233         if (v_tty && v_level > 0)
 234                 stat_display(xs, 1);
 235         else if (v_level > 0)
 236                 fprintf(stderr, "%-46s", xs->name);
 237 }
 238
 239 /*
 240  * Update the transfer statistics
 241  */
 242 static void
 243 stat_update(struct xferstat *xs, off_t rcvd)
 244 {
 245         xs->rcvd = rcvd;
 246         if (v_tty && v_level > 0)
 247                 stat_display(xs, 0);
 248 }
 249
 250 /*
 251  * Finalize the transfer statistics
 252  */
 253 static void
 254 stat_end(struct xferstat *xs)
 255 {
 256         gettimeofday(&xs->last, NULL);
 257         if (v_tty && v_level > 0) {
 258                 stat_display(xs, 1);
 259                 putc('\n', stderr);
 260         } else if (v_level > 0) {
 261                 fprintf(stderr, "        %s %s\n",
 262                     stat_bytes(xs->size), stat_bps(xs));
 263         }
 264 }
 265
 266 /*
 267  * Ask the user for authentication details
 268  */
 269 static int
 270 query_auth(struct url *URL)
 271 {
 272         struct termios tios;
 273         tcflag_t saved_flags;
 274         int i, nopwd;
 275
 276         fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
 277             URL->scheme, URL->host, URL->port);
 278
 279         fprintf(stderr, "Login: ");
 280         if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
 281                 return (-1);
 282         for (i = strlen(URL->user); i >= 0; --i)
 283                 if (URL->user[i] == '\r' || URL->user[i] == '\n')
 284                         URL->user[i] = '\0';
 285
 286         fprintf(stderr, "Password: ");
 287         if (tcgetattr(STDIN_FILENO, &tios) == 0) {
 288                 saved_flags = tios.c_lflag;
 289                 tios.c_lflag &= ~ECHO;
 290                 tios.c_lflag |= ECHONL|ICANON;
 291                 tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
 292                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 293                 tios.c_lflag = saved_flags;
 294                 tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
 295         } else {
 296                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 297         }
 298         if (nopwd)
 299                 return (-1);
 300         for (i = strlen(URL->pwd); i >= 0; --i)
 301                 if (URL->pwd[i] == '\r' || URL->pwd[i] == '\n')
 302                         URL->pwd[i] = '\0';
 303
 304         return (0);
 305 }
 306
 307 /*
 308  * Fetch a file
 309  */
 310 static int
 311 fetch(char *URL, const char *path)
 312 {
 313         struct url *url;
 314         struct url_stat us;
 315         struct stat sb, nsb;
 316         struct xferstat xs;
 317         FILE *f, *of;
 318         size_t size, wr;
 319         off_t count;
 320         char flags[8];
 321         const char *slash;
 322         char *tmppath;
 323         int r;
 324         unsigned timeout;
 325         char *ptr;
 326
 327         f = of = NULL;
 328         tmppath = NULL;
 329
 330         timeout = 0;
 331         *flags = 0;
 332         count = 0;
 333
 334         /* set verbosity level */
 335         if (v_level > 1)
 336                 strcat(flags, "v");
 337         if (v_level > 2)
 338                 fetchDebug = 1;
 339
 340         /* parse URL */
 341         if ((url = fetchParseURL(URL)) == NULL) {
 342                 warnx("%s: parse error", URL);
 343                 goto failure;
 344         }
 345
 346         /* if no scheme was specified, take a guess */
 347         if (*url->scheme == 0) {
 348                 if (*url->host == 0)
 349                         strcpy(url->scheme, SCHEME_FILE);
 350                 else if (strncasecmp(url->host, "ftp.", 4) == 0)
 351                         strcpy(url->scheme, SCHEME_FTP);
 352                 else if (strncasecmp(url->host, "www.", 4) == 0)
 353                         strcpy(url->scheme, SCHEME_HTTP);
 354         }
 355
 356         /* common flags */
 357         switch (family) {
 358         case PF_INET:
 359                 strcat(flags, "4");
 360                 break;
 361         case PF_INET6:
 362                 strcat(flags, "6");
 363                 break;
 364         }
 365
 366         /* FTP specific flags */
 367         if (strcmp(url->scheme, "ftp") == 0) {
 368                 if (p_flag)
 369                         strcat(flags, "p");
 370                 if (d_flag)
 371                         strcat(flags, "d");
 372                 if (U_flag)
 373                         strcat(flags, "l");
 374                 timeout = T_secs ? T_secs : ftp_timeout;
 375         }
 376
 377         /* HTTP specific flags */
 378         if (strcmp(url->scheme, "http") == 0) {
 379                 if (d_flag)
 380                         strcat(flags, "d");
 381                 if (A_flag)
 382                         strcat(flags, "A");
 383                 timeout = T_secs ? T_secs : http_timeout;
 384         }
 385
 386         /* set the protocol timeout. */
 387         fetchTimeout = timeout;
 388
 389         /* just print size */
 390         if (s_flag) {
 391                 if (timeout)
 392                         alarm(timeout);
 393                 r = fetchStat(url, &us, flags);
 394                 if (timeout)
 395                         alarm(0);
 396                 if (sigalrm || sigint)
 397                         goto signal;
 398                 if (r == -1) {
 399                         warnx("%s", fetchLastErrString);
 400                         goto failure;
 401                 }
 402                 if (us.size == -1)
 403                         printf("Unknown\n");
 404                 else
 405                         printf("%jd\n", (intmax_t)us.size);
 406                 goto success;
 407         }
 408
 409         /*
 410          * If the -r flag was specified, we have to compare the local
 411          * and remote files, so we should really do a fetchStat()
 412          * first, but I know of at least one HTTP server that only
 413          * sends the content size in response to GET requests, and
 414          * leaves it out of replies to HEAD requests.  Also, in the
 415          * (frequent) case that the local and remote files match but
 416          * the local file is truncated, we have sufficient information
 417          * before the compare to issue a correct request.  Therefore,
 418          * we always issue a GET request as if we were sure the local
 419          * file was a truncated copy of the remote file; we can drop
 420          * the connection later if we change our minds.
 421          */
 422         sb.st_size = -1;
 423         if (!o_stdout) {
 424                 r = stat(path, &sb);
 425                 if (r == 0 && r_flag && S_ISREG(sb.st_mode)) {
 426                         url->offset = sb.st_size;
 427                 } else if (r == -1 || !S_ISREG(sb.st_mode)) {
 428                         /*
 429                          * Whatever value sb.st_size has now is either
 430                          * wrong (if stat(2) failed) or irrelevant (if the
 431                          * path does not refer to a regular file)
 432                          */
 433                         sb.st_size = -1;
 434                 }
 435                 if (r == -1 && errno != ENOENT) {
 436                         warnx("%s: stat()", path);
 437                         goto failure;
 438                 }
 439         }
 440
 441         /* start the transfer */
 442         if (timeout)
 443                 alarm(timeout);
 444         f = fetchXGet(url, &us, flags);
 445         if (timeout)
 446                 alarm(0);
 447         if (sigalrm || sigint)
 448                 goto signal;
 449         if (f == NULL) {
 450                 warnx("%s: %s", URL, fetchLastErrString);
 451                 goto failure;
 452         }
 453         if (sigint)
 454                 goto signal;
 455
 456         /* check that size is as expected */
 457         if (S_size) {
 458                 if (us.size == -1) {
 459                         warnx("%s: size unknown", URL);
 460                 } else if (us.size != S_size) {
 461                         warnx("%s: size mismatch: expected %jd, actual %jd",
 462                             URL, (intmax_t)S_size, (intmax_t)us.size);
 463                         goto failure;
 464                 }
 465         }
 466
 467         /* symlink instead of copy */
 468         if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
 469                 if (symlink(url->doc, path) == -1) {
 470                         warn("%s: symlink()", path);
 471                         goto failure;
 472                 }
 473                 goto success;
 474         }
 475
 476         if (us.size == -1 && !o_stdout && v_level > 0)
 477                 warnx("%s: size of remote file is not known", URL);
 478         if (v_level > 1) {
 479                 if (sb.st_size != -1)
 480                         fprintf(stderr, "local size / mtime: %jd / %ld\n",
 481                             (intmax_t)sb.st_size, (long)sb.st_mtime);
 482                 if (us.size != -1)
 483                         fprintf(stderr, "remote size / mtime: %jd / %ld\n",
 484                             (intmax_t)us.size, (long)us.mtime);
 485         }
 486
 487         /* open output file */
 488         if (o_stdout) {
 489                 /* output to stdout */
 490                 of = stdout;
 491         } else if (r_flag && sb.st_size != -1) {
 492                 /* resume mode, local file exists */
 493                 if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
 494                         /* no match! have to refetch */
 495                         fclose(f);
 496                         /* if precious, warn the user and give up */
 497                         if (R_flag) {
 498                                 warnx("%s: local modification time "
 499                                     "does not match remote", path);
 500                                 goto failure_keep;
 501                         }
 502                 } else if (us.size != -1) {
 503                         if (us.size == sb.st_size)
 504                                 /* nothing to do */
 505                                 goto success;
 506                         if (sb.st_size > us.size) {
 507                                 /* local file too long! */
 508                                 warnx("%s: local file (%jd bytes) is longer "
 509                                     "than remote file (%jd bytes)", path,
 510                                     (intmax_t)sb.st_size, (intmax_t)us.size);
 511                                 goto failure;
 512                         }
 513                         /* we got it, open local file */
 514                         if ((of = fopen(path, "a")) == NULL) {
 515                                 warn("%s: fopen()", path);
 516                                 goto failure;
 517                         }
 518                         /* check that it didn't move under our feet */
 519                         if (fstat(fileno(of), &nsb) == -1) {
 520                                 /* can't happen! */
 521                                 warn("%s: fstat()", path);
 522                                 goto failure;
 523                         }
 524                         if (nsb.st_dev != sb.st_dev ||
 525                             nsb.st_ino != nsb.st_ino ||
 526                             nsb.st_size != sb.st_size) {
 527                                 warnx("%s: file has changed", URL);
 528                                 fclose(of);
 529                                 of = NULL;
 530                                 sb = nsb;
 531                         }
 532                 }
 533         } else if (m_flag && sb.st_size != -1) {
 534                 /* mirror mode, local file exists */
 535                 if (sb.st_size == us.size && sb.st_mtime == us.mtime)
 536                         goto success;
 537         }
 538
 539         if (of == NULL) {
 540                 /*
 541                  * We don't yet have an output file; either this is a
 542                  * vanilla run with no special flags, or the local and
 543                  * remote files didn't match.
 544                  */
 545
 546                 if (url->offset > 0) {
 547                         /*
 548                          * We tried to restart a transfer, but for
 549                          * some reason gave up - so we have to restart
 550                          * from scratch if we want the whole file
 551                          */
 552                         url->offset = 0;
 553                         if ((f = fetchXGet(url, &us, flags)) == NULL) {
 554                                 warnx("%s: %s", URL, fetchLastErrString);
 555                                 goto failure;
 556                         }
 557                         if (sigint)
 558                                 goto signal;
 559                 }
 560
 561                 /* construct a temporary file name */
 562                 if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
 563                         if ((slash = strrchr(path, '/')) == NULL)
 564                                 slash = path;
 565                         else
 566                                 ++slash;
 567                         asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
 568                             (int)(slash - path), path, slash);
 569                         if (tmppath != NULL) {
 570                                 if (mkstemps(tmppath, strlen(slash)+1) == -1) {
 571                                         warn("%s: mkstemps()", path);
 572                                         goto failure;
 573                                 }
 574
 575                                 of = fopen(tmppath, "w");
 576                                 chown(tmppath, sb.st_uid, sb.st_gid);
 577                                 chmod(tmppath, sb.st_mode & ALLPERMS);
 578                         }
 579                 }
 580
 581                 if (of == NULL)
 582                         if ((of = fopen(path, "w")) == NULL) {
 583                                 warn("%s: fopen()", path);
 584                         goto failure;
 585                 }
 586         }
 587         count = url->offset;
 588
 589         /* start the counter */
 590         stat_start(&xs, path, us.size, count);
 591
 592         sigalrm = siginfo = sigint = 0;
 593
 594         /* suck in the data */
 595         signal(SIGINFO, sig_handler);
 596         while (!sigint) {
 597                 if (us.size != -1 && us.size - count < B_size &&
 598                     us.size - count >= 0)
 599                         size = us.size - count;
 600                 else
 601                         size = B_size;
 602                 if (siginfo) {
 603                         stat_end(&xs);
 604                         siginfo = 0;
 605                 }
 606                 if ((size = fread(buf, 1, size, f)) == 0) {
 607                         if (ferror(f) && errno == EINTR && !sigint)
 608                                 clearerr(f);
 609                         else
 610                                 break;
 611                 }
 612                 stat_update(&xs, count += size);
 613                 for (ptr = buf; size > 0; ptr += wr, size -= wr)
 614                         if ((wr = fwrite(ptr, 1, size, of)) < size) {
 615                                 if (ferror(of) && errno == EINTR && !sigint)
 616                                         clearerr(of);
 617                                 else
 618                                         break;
 619                         }
 620                 if (size != 0)
 621                         break;
 622         }
 623         if (!sigalrm)
 624                 sigalrm = ferror(f) && errno == ETIMEDOUT;
 625         signal(SIGINFO, SIG_DFL);
 626
 627         stat_end(&xs);
 628
 629         /*
 630          * If the transfer timed out or was interrupted, we still want to
 631          * set the mtime in case the file is not removed (-r or -R) and
 632          * the user later restarts the transfer.
 633          */
 634  signal:
 635         /* set mtime of local file */
 636         if (!n_flag && us.mtime && !o_stdout && of != NULL &&
 637             (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
 638                 struct timeval tv[2];
 639
 640                 fflush(of);
 641                 tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
 642                 tv[1].tv_sec = (long)us.mtime;
 643                 tv[0].tv_usec = tv[1].tv_usec = 0;
 644                 if (utimes(tmppath ? tmppath : path, tv))
 645                         warn("%s: utimes()", tmppath ? tmppath : path);
 646         }
 647
 648         /* timed out or interrupted? */
 649         if (sigalrm)
 650                 warnx("transfer timed out");
 651         if (sigint) {
 652                 warnx("transfer interrupted");
 653                 goto failure;
 654         }
 655
 656         /* timeout / interrupt before connection completley established? */
 657         if (f == NULL)
 658                 goto failure;
 659
 660         if (!sigalrm) {
 661                 /* check the status of our files */
 662                 if (ferror(f))
 663                         warn("%s", URL);
 664                 if (ferror(of))
 665                         warn("%s", path);
 666                 if (ferror(f) || ferror(of))
 667                         goto failure;
 668         }
 669
 670         /* did the transfer complete normally? */
 671         if (us.size != -1 && count < us.size) {
 672                 warnx("%s appears to be truncated: %jd/%jd bytes",
 673                     path, (intmax_t)count, (intmax_t)us.size);
 674                 goto failure_keep;
 675         }
 676
 677         /*
 678          * If the transfer timed out and we didn't know how much to
 679          * expect, assume the worst (i.e. we didn't get all of it)
 680          */
 681         if (sigalrm && us.size == -1) {
 682                 warnx("%s may be truncated", path);
 683                 goto failure_keep;
 684         }
 685
 686  success:
 687         r = 0;
 688         if (tmppath != NULL && rename(tmppath, path) == -1) {
 689                 warn("%s: rename()", path);
 690                 goto failure_keep;
 691         }
 692         goto done;
 693  failure:
 694         if (of && of != stdout && !R_flag && !r_flag)
 695                 if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
 696                         unlink(tmppath ? tmppath : path);
 697         if (R_flag && tmppath != NULL && sb.st_size == -1)
 698                 rename(tmppath, path); /* ignore errors here */
 699  failure_keep:
 700         r = -1;
 701         goto done;
 702  done:
 703         if (f)
 704                 fclose(f);
 705         if (of && of != stdout)
 706                 fclose(of);
 707         if (url)
 708                 fetchFreeURL(url);
 709         if (tmppath != NULL)
 710                 free(tmppath);
 711         return (r);
 712 }
 713
 714 static void
 715 usage(void)
 716 {
 717         fprintf(stderr, "%s\n%s\n%s\n",
 718             "usage: fetch [-146AFMPRUadlmnpqrsv] [-N netrc] [-o outputfile]",
 719             "             [-S bytes] [-B bytes] [-T seconds] [-w seconds]",
 720             "             [-h host -f file [-c dir] | URL ...]");
 721 }
 722
 723
 724 /*
 725  * Entry point
 726  */
 727 int
 728 main(int argc, char *argv[])
 729 {
 730         struct stat sb;
 731         struct sigaction sa;
 732         const char *p, *s;
 733         char *end, *q;
 734         int c, e, r;
 735
 736         while ((c = getopt(argc, argv,
 737             "146AaB:bc:dFf:Hh:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
 738                 switch (c) {
 739                 case '1':
 740                         once_flag = 1;
 741                         break;
 742                 case '4':
 743                         family = PF_INET;
 744                         break;
 745                 case '6':
 746                         family = PF_INET6;
 747                         break;
 748                 case 'A':
 749                         A_flag = 1;
 750                         break;
 751                 case 'a':
 752                         a_flag = 1;
 753                         break;
 754                 case 'B':
 755                         B_size = (off_t)strtol(optarg, &end, 10);
 756                         if (*optarg == '\0' || *end != '\0')
 757                                 errx(1, "invalid buffer size (%s)", optarg);
 758                         break;
 759                 case 'b':
 760                         warnx("warning: the -b option is deprecated");
 761                         b_flag = 1;
 762                         break;
 763                 case 'c':
 764                         c_dirname = optarg;
 765                         break;
 766                 case 'd':
 767                         d_flag = 1;
 768                         break;
 769                 case 'F':
 770                         F_flag = 1;
 771                         break;
 772                 case 'f':
 773                         f_filename = optarg;
 774                         break;
 775                 case 'H':
 776                         warnx("the -H option is now implicit, "
 777                             "use -U to disable");
 778                         break;
 779                 case 'h':
 780                         h_hostname = optarg;
 781                         break;
 782                 case 'l':
 783                         l_flag = 1;
 784                         break;
 785                 case 'o':
 786                         o_flag = 1;
 787                         o_filename = optarg;
 788                         break;
 789                 case 'M':
 790                 case 'm':
 791                         if (r_flag)
 792                                 errx(1, "the -m and -r flags "
 793                                     "are mutually exclusive");
 794                         m_flag = 1;
 795                         break;
 796                 case 'N':
 797                         N_filename = optarg;
 798                         break;
 799                 case 'n':
 800                         n_flag = 1;
 801                         break;
 802                 case 'P':
 803                 case 'p':
 804                         p_flag = 1;
 805                         break;
 806                 case 'q':
 807                         v_level = 0;
 808                         break;
 809                 case 'R':
 810                         R_flag = 1;
 811                         break;
 812                 case 'r':
 813                         if (m_flag)
 814                                 errx(1, "the -m and -r flags "
 815                                     "are mutually exclusive");
 816                         r_flag = 1;
 817                         break;
 818                 case 'S':
 819                         S_size = (off_t)strtol(optarg, &end, 10);
 820                         if (*optarg == '\0' || *end != '\0')
 821                                 errx(1, "invalid size (%s)", optarg);
 822                         break;
 823                 case 's':
 824                         s_flag = 1;
 825                         break;
 826                 case 'T':
 827                         T_secs = strtol(optarg, &end, 10);
 828                         if (*optarg == '\0' || *end != '\0')
 829                                 errx(1, "invalid timeout (%s)", optarg);
 830                         break;
 831                 case 't':
 832                         t_flag = 1;
 833                         warnx("warning: the -t option is deprecated");
 834                         break;
 835                 case 'U':
 836                         U_flag = 1;
 837                         break;
 838                 case 'v':
 839                         v_level++;
 840                         break;
 841                 case 'w':
 842                         a_flag = 1;
 843                         w_secs = strtol(optarg, &end, 10);
 844                         if (*optarg == '\0' || *end != '\0')
 845                                 errx(1, "invalid delay (%s)", optarg);
 846                         break;
 847                 default:
 848                         usage();
 849                         exit(EX_USAGE);
 850                 }
 851
 852         argc -= optind;
 853         argv += optind;
 854
 855         if (h_hostname || f_filename || c_dirname) {
 856                 if (!h_hostname || !f_filename || argc) {
 857                         usage();
 858                         exit(EX_USAGE);
 859                 }
 860                 /* XXX this is a hack. */
 861                 if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
 862                         errx(1, "invalid hostname");
 863                 if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
 864                     c_dirname ? c_dirname : "", f_filename) == -1)
 865                         errx(1, "%s", strerror(ENOMEM));
 866                 argc++;
 867         }
 868
 869         if (!argc) {
 870                 usage();
 871                 exit(EX_USAGE);
 872         }
 873
 874         /* allocate buffer */
 875         if (B_size < MINBUFSIZE)
 876                 B_size = MINBUFSIZE;
 877         if ((buf = malloc(B_size)) == NULL)
 878                 errx(1, "%s", strerror(ENOMEM));
 879
 880         /* timeouts */
 881         if ((s = getenv("FTP_TIMEOUT")) != NULL) {
 882                 ftp_timeout = strtol(s, &end, 10);
 883                 if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
 884                         warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
 885                         ftp_timeout = 0;
 886                 }
 887         }
 888         if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
 889                 http_timeout = strtol(s, &end, 10);
 890                 if (*s == '\0' || *end != '\0' || http_timeout < 0) {
 891                         warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
 892                         http_timeout = 0;
 893                 }
 894         }
 895
 896         /* signal handling */
 897         sa.sa_flags = 0;
 898         sa.sa_handler = sig_handler;
 899         sigemptyset(&sa.sa_mask);
 900         sigaction(SIGALRM, &sa, NULL);
 901         sa.sa_flags = SA_RESETHAND;
 902         sigaction(SIGINT, &sa, NULL);
 903         fetchRestartCalls = 0;
 904
 905         /* output file */
 906         if (o_flag) {
 907                 if (strcmp(o_filename, "-") == 0) {
 908                         o_stdout = 1;
 909                 } else if (stat(o_filename, &sb) == -1) {
 910                         if (errno == ENOENT) {
 911                                 if (argc > 1)
 912                                         errx(EX_USAGE, "%s is not a directory",
 913                                             o_filename);
 914                         } else {
 915                                 err(EX_IOERR, "%s", o_filename);
 916                         }
 917                 } else {
 918                         if (sb.st_mode & S_IFDIR)
 919                                 o_directory = 1;
 920                 }
 921         }
 922
 923         /* check if output is to a tty (for progress report) */
 924         v_tty = isatty(STDERR_FILENO);
 925         if (v_tty)
 926                 pgrp = getpgrp();
 927
 928         r = 0;
 929
 930         /* authentication */
 931         if (v_tty)
 932                 fetchAuthMethod = query_auth;
 933         if (N_filename != NULL) {
 934                 if (setenv("NETRC", N_filename, 1) == -1)
 935                         err(1, "setenv: cannot set NETRC=%s", N_filename);
 936         }
 937
 938         while (argc) {
 939                 if ((p = strrchr(*argv, '/')) == NULL)
 940                         p = *argv;
 941                 else
 942                         p++;
 943
 944                 if (!*p)
 945                         p = "fetch.out";
 946
 947                 fetchLastErrCode = 0;
 948
 949                 if (o_flag) {
 950                         if (o_stdout) {
 951                                 e = fetch(*argv, "-");
 952                         } else if (o_directory) {
 953                                 asprintf(&q, "%s/%s", o_filename, p);
 954                                 e = fetch(*argv, q);
 955                                 free(q);
 956                         } else {
 957                                 e = fetch(*argv, o_filename);
 958                         }
 959                 } else {
 960                         e = fetch(*argv, p);
 961                 }
 962
 963                 if (sigint)
 964                         kill(getpid(), SIGINT);
 965
 966                 if (e == 0 && once_flag)
 967                         exit(0);
 968
 969                 if (e) {
 970                         r = 1;
 971                         if ((fetchLastErrCode
 972                             && fetchLastErrCode != FETCH_UNAVAIL
 973                             && fetchLastErrCode != FETCH_MOVED
 974                             && fetchLastErrCode != FETCH_URL
 975                             && fetchLastErrCode != FETCH_RESOLV
 976                             && fetchLastErrCode != FETCH_UNKNOWN)) {
 977                                 if (w_secs && v_level)
 978                                         fprintf(stderr, "Waiting %ld seconds "
 979                                             "before retrying\n", w_secs);
 980                                 if (w_secs)
 981                                         sleep(w_secs);
 982                                 if (a_flag)
 983                                         continue;
 984                         }
 985                 }
 986
 987                 argc--, argv++;
 988         }
 989
 990         exit(r);
 991 }