usr.bin/fetch/fetch.c

   1 /*-
   2  * Copyright (c) 2000 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 1.10.2.21 2003/06/06 06:48:42 des Exp $
  29  * $DragonFly: src/usr.bin/fetch/fetch.c,v 1.7 2006/03/06 03:21:26 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 <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <sysexits.h>
  45 #include <termios.h>
  46 #include <unistd.h>
  47
  48 #include <fetch.h>
  49
  50 #define MINBUFSIZE      4096
  51
  52 /* Option flags */
  53 int      A_flag;        /*    -A: do not follow 302 redirects */
  54 int      a_flag;        /*    -a: auto retry */
  55 off_t    B_size;        /*    -B: buffer size */
  56 int      b_flag;        /*!   -b: workaround TCP bug */
  57 char    *c_dirname;     /*    -c: remote directory */
  58 int      d_flag;        /*    -d: direct connection */
  59 int      F_flag;        /*    -F: restart without checking mtime  */
  60 char    *f_filename;    /*    -f: file to fetch */
  61 char    *h_hostname;    /*    -h: host to fetch from */
  62 int      l_flag;        /*    -l: link rather than copy file: URLs */
  63 int      m_flag;        /* -[Mm]: mirror mode */
  64 char    *N_filename;    /*    -N: netrc file name */
  65 int      n_flag;        /*    -n: do not preserve modification time */
  66 int      o_flag;        /*    -o: specify output file */
  67 int      o_directory;   /*        output file is a directory */
  68 char    *o_filename;    /*        name of output file */
  69 int      o_stdout;      /*        output file is stdout */
  70 int      once_flag;     /*    -1: stop at first successful file */
  71 int      p_flag;        /* -[Pp]: use passive FTP */
  72 int      R_flag;        /*    -R: don't delete partially transferred files */
  73 int      r_flag;        /*    -r: restart previously interrupted transfer */
  74 off_t    S_size;        /*    -S: require size to match */
  75 int      s_flag;        /*    -s: show size, don't fetch */
  76 long     T_secs = 120;  /*    -T: transfer timeout in seconds */
  77 int      t_flag;        /*!   -t: workaround TCP bug */
  78 int      U_flag;        /*    -U: do not use high ports */
  79 int      v_level = 1;   /*    -v: verbosity level */
  80 int      v_tty;         /*        stdout is a tty */
  81 pid_t    pgrp;          /*        our process group */
  82 long     w_secs;        /*    -w: retry delay */
  83 int      family = PF_UNSPEC;    /* -[46]: address family to use */
  84
  85 int      sigalrm;       /* SIGALRM received */
  86 int      siginfo;       /* SIGINFO received */
  87 int      sigint;        /* SIGINT received */
  88
  89 long     ftp_timeout;   /* default timeout for FTP transfers */
  90 long     http_timeout;  /* default timeout for HTTP transfers */
  91 u_char  *buf;           /* transfer buffer */
  92
  93
  94 /*
  95  * Signal handler
  96  */
  97 static void
  98 sig_handler(int sig)
  99 {
 100         switch (sig) {
 101         case SIGALRM:
 102                 sigalrm = 1;
 103                 break;
 104         case SIGINFO:
 105                 siginfo = 1;
 106                 break;
 107         case SIGINT:
 108                 sigint = 1;
 109                 break;
 110         }
 111 }
 112
 113 struct xferstat {
 114         char             name[40];
 115         struct timeval   start;
 116         struct timeval   last;
 117         off_t            size;
 118         off_t            offset;
 119         off_t            rcvd;
 120 };
 121
 122 /*
 123  * Compute and display ETA
 124  */
 125 static void
 126 stat_eta(struct xferstat *xs)
 127 {
 128         long elapsed, received, expected, eta;
 129
 130         elapsed = xs->last.tv_sec - xs->start.tv_sec;
 131         received = xs->rcvd - xs->offset;
 132         expected = xs->size - xs->rcvd;
 133         eta = (long)((double)elapsed * expected / received);
 134         if (eta > 3600) {
 135                 fprintf(stderr, "%02ld:", eta / 3600);
 136                 eta %= 3600;
 137         }
 138         fprintf(stderr, "%02ld:%02ld", eta / 60, eta % 60);
 139 }
 140
 141 /*
 142  * Compute and display transfer rate
 143  */
 144 static void
 145 stat_bps(struct xferstat *xs)
 146 {
 147         double delta, bps;
 148
 149         delta = (xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
 150             - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
 151         if (delta == 0.0) {
 152                 fprintf(stderr, "?? Bps");
 153                 return;
 154         }
 155         bps = (xs->rcvd - xs->offset) / delta;
 156         if (bps > 1024*1024)
 157                 fprintf(stderr, "%.2f MBps", bps / (1024*1024));
 158         else if (bps > 1024)
 159                 fprintf(stderr, "%.2f kBps", bps / 1024);
 160         else
 161                 fprintf(stderr, "%.2f Bps", bps);
 162 }
 163
 164 /*
 165  * Update the stats display
 166  */
 167 static void
 168 stat_display(struct xferstat *xs, int force)
 169 {
 170         struct timeval now;
 171         int ctty_pgrp;
 172
 173         if (!v_tty || !v_level)
 174                 return;
 175
 176         /* check if we're the foreground process */
 177         if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
 178             (pid_t)ctty_pgrp != pgrp)
 179                 return;
 180
 181         gettimeofday(&now, NULL);
 182         if (!force && now.tv_sec <= xs->last.tv_sec)
 183                 return;
 184         xs->last = now;
 185
 186         fprintf(stderr, "\rReceiving %s", xs->name);
 187         if (xs->size <= 0) {
 188                 fprintf(stderr, ": %lld bytes", (long long)xs->rcvd);
 189         } else {
 190                 fprintf(stderr, " (%lld bytes): %d%%", (long long)xs->size,
 191                     (int)((100.0 * xs->rcvd) / xs->size));
 192                 if (xs->rcvd > 0 && xs->last.tv_sec >= xs->start.tv_sec + 30) {
 193                         fprintf(stderr, " (ETA ");
 194                         stat_eta(xs);
 195                         if (v_level > 1) {
 196                                 fprintf(stderr, " at ");
 197                                 stat_bps(xs);
 198                         }
 199                         fprintf(stderr, ")  ");
 200                 }
 201         }
 202 }
 203
 204 /*
 205  * Initialize the transfer statistics
 206  */
 207 static void
 208 stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
 209 {
 210         snprintf(xs->name, sizeof xs->name, "%s", name);
 211         gettimeofday(&xs->start, NULL);
 212         xs->last.tv_sec = xs->last.tv_usec = 0;
 213         xs->size = size;
 214         xs->offset = offset;
 215         xs->rcvd = offset;
 216         stat_display(xs, 1);
 217 }
 218
 219 /*
 220  * Update the transfer statistics
 221  */
 222 static void
 223 stat_update(struct xferstat *xs, off_t rcvd)
 224 {
 225         xs->rcvd = rcvd;
 226         stat_display(xs, 0);
 227 }
 228
 229 /*
 230  * Finalize the transfer statistics
 231  */
 232 static void
 233 stat_end(struct xferstat *xs)
 234 {
 235         double delta;
 236
 237         if (!v_level)
 238                 return;
 239
 240         gettimeofday(&xs->last, NULL);
 241
 242         stat_display(xs, 1);
 243         fputc('\n', stderr);
 244         delta = (xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
 245             - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
 246         fprintf(stderr, "%lld bytes transferred in %.1f seconds (",
 247             (long long)(xs->rcvd - xs->offset), delta);
 248         stat_bps(xs);
 249         fprintf(stderr, ")\n");
 250 }
 251
 252 /*
 253  * Ask the user for authentication details
 254  */
 255 static int
 256 query_auth(struct url *URL)
 257 {
 258         struct termios tios;
 259         tcflag_t saved_flags;
 260         int i, nopwd;
 261
 262
 263         fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
 264             URL->scheme, URL->host, URL->port);
 265
 266         fprintf(stderr, "Login: ");
 267         if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
 268                 return -1;
 269         for (i = 0; URL->user[i]; ++i)
 270                 if (isspace(URL->user[i]))
 271                         URL->user[i] = '\0';
 272
 273         fprintf(stderr, "Password: ");
 274         if (tcgetattr(STDIN_FILENO, &tios) == 0) {
 275                 saved_flags = tios.c_lflag;
 276                 tios.c_lflag &= ~ECHO;
 277                 tios.c_lflag |= ECHONL|ICANON;
 278                 tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
 279                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 280                 tios.c_lflag = saved_flags;
 281                 tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
 282         } else {
 283                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 284         }
 285         if (nopwd)
 286                 return -1;
 287
 288         for (i = 0; URL->pwd[i]; ++i)
 289                 if (isspace(URL->pwd[i]))
 290                         URL->pwd[i] = '\0';
 291         return 0;
 292 }
 293
 294 /*
 295  * Fetch a file
 296  */
 297 static int
 298 fetch(char *URL, const char *path)
 299 {
 300         struct url *url;
 301         struct url_stat us;
 302         struct stat sb, nsb;
 303         struct xferstat xs;
 304         FILE *f, *of;
 305         size_t size, wr;
 306         off_t count;
 307         char flags[8];
 308         const char *slash;
 309         char *tmppath;
 310         int r;
 311         u_int timeout;
 312         u_char *ptr;
 313
 314         f = of = NULL;
 315         tmppath = NULL;
 316
 317         timeout = 0;
 318         *flags = 0;
 319         count = 0;
 320
 321         /* set verbosity level */
 322         if (v_level > 1)
 323                 strcat(flags, "v");
 324         if (v_level > 2)
 325                 fetchDebug = 1;
 326
 327         /* parse URL */
 328         if ((url = fetchParseURL(URL)) == NULL) {
 329                 warnx("%s: parse error", URL);
 330                 goto failure;
 331         }
 332
 333         /* if no scheme was specified, take a guess */
 334         if (*url->scheme == 0) {
 335                 if (*url->host == 0)
 336                         strcpy(url->scheme, SCHEME_FILE);
 337                 else if (strncasecmp(url->host, "ftp.", 4) == 0)
 338                         strcpy(url->scheme, SCHEME_FTP);
 339                 else if (strncasecmp(url->host, "www.", 4) == 0)
 340                         strcpy(url->scheme, SCHEME_HTTP);
 341         }
 342
 343         /* common flags */
 344         switch (family) {
 345         case PF_INET:
 346                 strcat(flags, "4");
 347                 break;
 348         case PF_INET6:
 349                 strcat(flags, "6");
 350                 break;
 351         }
 352
 353         /* FTP specific flags */
 354         if (strcmp(url->scheme, "ftp") == 0) {
 355                 if (p_flag)
 356                         strcat(flags, "p");
 357                 if (d_flag)
 358                         strcat(flags, "d");
 359                 if (U_flag)
 360                         strcat(flags, "l");
 361                 timeout = T_secs ? T_secs : ftp_timeout;
 362         }
 363
 364         /* HTTP specific flags */
 365         if (strcmp(url->scheme, "http") == 0) {
 366                 if (d_flag)
 367                         strcat(flags, "d");
 368                 if (A_flag)
 369                         strcat(flags, "A");
 370                 timeout = T_secs ? T_secs : http_timeout;
 371         }
 372
 373         /* set the protocol timeout. */
 374         fetchTimeout = timeout;
 375
 376         /* just print size */
 377         if (s_flag) {
 378                 if (timeout)
 379                         alarm(timeout);
 380                 r = fetchStat(url, &us, flags);
 381                 if (timeout)
 382                         alarm(0);
 383                 if (sigalrm || sigint)
 384                         goto signal;
 385                 if (r == -1) {
 386                         warnx("%s", fetchLastErrString);
 387                         goto failure;
 388                 }
 389                 if (us.size == -1)
 390                         printf("Unknown\n");
 391                 else
 392                         printf("%lld\n", (long long)us.size);
 393                 goto success;
 394         }
 395
 396         /*
 397          * If the -r flag was specified, we have to compare the local
 398          * and remote files, so we should really do a fetchStat()
 399          * first, but I know of at least one HTTP server that only
 400          * sends the content size in response to GET requests, and
 401          * leaves it out of replies to HEAD requests.  Also, in the
 402          * (frequent) case that the local and remote files match but
 403          * the local file is truncated, we have sufficient information
 404          * before the compare to issue a correct request.  Therefore,
 405          * we always issue a GET request as if we were sure the local
 406          * file was a truncated copy of the remote file; we can drop
 407          * the connection later if we change our minds.
 408          */
 409         sb.st_size = -1;
 410         if (!o_stdout && stat(path, &sb) == -1 && errno != ENOENT) {
 411                 warnx("%s: stat()", path);
 412                 goto failure;
 413         }
 414         if (!o_stdout && r_flag && S_ISREG(sb.st_mode))
 415                 url->offset = sb.st_size;
 416
 417         /* start the transfer */
 418         if (timeout)
 419                 alarm(timeout);
 420         f = fetchXGet(url, &us, flags);
 421         if (timeout)
 422                 alarm(0);
 423         if (sigalrm || sigint)
 424                 goto signal;
 425         if (f == NULL) {
 426                 warnx("%s: %s", URL, fetchLastErrString);
 427                 goto failure;
 428         }
 429         if (sigint)
 430                 goto signal;
 431
 432         /* check that size is as expected */
 433         if (S_size) {
 434                 if (us.size == -1) {
 435                         warnx("%s: size unknown", URL);
 436                         goto failure;
 437                 } else if (us.size != S_size) {
 438                         warnx("%s: size mismatch: expected %lld, actual %lld",
 439                             URL, (long long)S_size, (long long)us.size);
 440                         goto failure;
 441                 }
 442         }
 443
 444         /* symlink instead of copy */
 445         if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
 446                 if (symlink(url->doc, path) == -1) {
 447                         warn("%s: symlink()", path);
 448                         goto failure;
 449                 }
 450                 goto success;
 451         }
 452
 453         if (us.size == -1 && !o_stdout && v_level > 0)
 454                 warnx("%s: size of remote file is not known", URL);
 455         if (v_level > 1) {
 456                 if (sb.st_size != -1)
 457                         fprintf(stderr, "local size / mtime: %lld / %ld\n",
 458                             (long long)sb.st_size, (long)sb.st_mtime);
 459                 if (us.size != -1)
 460                         fprintf(stderr, "remote size / mtime: %lld / %ld\n",
 461                             (long long)us.size, (long)us.mtime);
 462         }
 463
 464         /* open output file */
 465         if (o_stdout) {
 466                 /* output to stdout */
 467                 of = stdout;
 468         } else if (r_flag && sb.st_size != -1) {
 469                 /* resume mode, local file exists */
 470                 if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
 471                         /* no match! have to refetch */
 472                         fclose(f);
 473                         /* if precious, warn the user and give up */
 474                         if (R_flag) {
 475                                 warnx("%s: local modification time "
 476                                     "does not match remote", path);
 477                                 goto failure_keep;
 478                         }
 479                 } else {
 480                         if (us.size == sb.st_size)
 481                                 /* nothing to do */
 482                                 goto success;
 483                         if (sb.st_size > us.size) {
 484                                 /* local file too long! */
 485                                 warnx("%s: local file (%lld bytes) is longer "
 486                                     "than remote file (%lld bytes)", path,
 487                                     (long long)sb.st_size, (long long)us.size);
 488                                 goto failure;
 489                         }
 490                         /* we got it, open local file */
 491                         if ((of = fopen(path, "a")) == NULL) {
 492                                 warn("%s: fopen()", path);
 493                                 goto failure;
 494                         }
 495                         /* check that it didn't move under our feet */
 496                         if (fstat(fileno(of), &nsb) == -1) {
 497                                 /* can't happen! */
 498                                 warn("%s: fstat()", path);
 499                                 goto failure;
 500                         }
 501                         if (nsb.st_dev != sb.st_dev ||
 502                             nsb.st_ino != nsb.st_ino ||
 503                             nsb.st_size != sb.st_size) {
 504                                 warnx("%s: file has changed", URL);
 505                                 fclose(of);
 506                                 of = NULL;
 507                                 sb = nsb;
 508                         }
 509                 }
 510         } else if (m_flag && sb.st_size != -1) {
 511                 /* mirror mode, local file exists */
 512                 if (sb.st_size == us.size && sb.st_mtime == us.mtime)
 513                         goto success;
 514         }
 515
 516         if (of == NULL) {
 517                 /*
 518                  * We don't yet have an output file; either this is a
 519                  * vanilla run with no special flags, or the local and
 520                  * remote files didn't match.
 521                  */
 522
 523                 if (url->offset > 0) {
 524                         /*
 525                          * We tried to restart a transfer, but for
 526                          * some reason gave up - so we have to restart
 527                          * from scratch if we want the whole file
 528                          */
 529                         url->offset = 0;
 530                         if ((f = fetchXGet(url, &us, flags)) == NULL) {
 531                                 warnx("%s: %s", URL, fetchLastErrString);
 532                                 goto failure;
 533                         }
 534                         if (sigint)
 535                                 goto signal;
 536                 }
 537
 538                 /* construct a temporary file name */
 539                 if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
 540                         if ((slash = strrchr(path, '/')) == NULL)
 541                                 slash = path;
 542                         else
 543                                 ++slash;
 544                         asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
 545                             (int)(slash - path), path, slash);
 546                         if (tmppath != NULL) {
 547                                 if (mkstemps(tmppath, strlen(slash)+1) == -1) {
 548                                         warn("%s: mkstemps()", path);
 549                                         goto failure;
 550                                 }
 551
 552                                 of = fopen(tmppath, "w");
 553                         }
 554                 }
 555
 556                 if (of == NULL)
 557                         if ((of = fopen(path, "w")) == NULL) {
 558                                 warn("%s: fopen()", path);
 559                         goto failure;
 560                 }
 561         }
 562         count = url->offset;
 563
 564         /* start the counter */
 565         stat_start(&xs, path, us.size, count);
 566
 567         sigalrm = siginfo = sigint = 0;
 568
 569         /* suck in the data */
 570         signal(SIGINFO, sig_handler);
 571         while (!sigint) {
 572                 if (us.size != -1 && us.size - count < B_size &&
 573                     us.size - count >= 0)
 574                         size = us.size - count;
 575                 else
 576                         size = B_size;
 577                 if (siginfo) {
 578                         stat_end(&xs);
 579                         siginfo = 0;
 580                 }
 581                 if ((size = fread(buf, 1, size, f)) == 0) {
 582                         if (ferror(f) && errno == EINTR && !sigint)
 583                                 clearerr(f);
 584                         else
 585                                 break;
 586                 }
 587                 stat_update(&xs, count += size);
 588                 for (ptr = buf; size > 0; ptr += wr, size -= wr)
 589                         if ((wr = fwrite(ptr, 1, size, of)) < size) {
 590                                 if (ferror(of) && errno == EINTR && !sigint)
 591                                         clearerr(of);
 592                                 else
 593                                         break;
 594                         }
 595                 if (size != 0)
 596                         break;
 597         }
 598         if (!sigalrm)
 599                 sigalrm = ferror(f) && errno == ETIMEDOUT;
 600         signal(SIGINFO, SIG_DFL);
 601
 602         stat_end(&xs);
 603
 604         /*
 605          * If the transfer timed out or was interrupted, we still want to
 606          * set the mtime in case the file is not removed (-r or -R) and
 607          * the user later restarts the transfer.
 608          */
 609  signal:
 610         /* set mtime of local file */
 611         if (!n_flag && us.mtime && !o_stdout && of != NULL &&
 612             (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
 613                 struct timeval tv[2];
 614
 615                 fflush(of);
 616                 tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
 617                 tv[1].tv_sec = (long)us.mtime;
 618                 tv[0].tv_usec = tv[1].tv_usec = 0;
 619                 if (utimes(tmppath ? tmppath : path, tv))
 620                         warn("%s: utimes()", tmppath ? tmppath : path);
 621         }
 622
 623         /* timed out or interrupted? */
 624         if (sigalrm)
 625                 warnx("transfer timed out");
 626         if (sigint) {
 627                 warnx("transfer interrupted");
 628                 goto failure;
 629         }
 630
 631         /* timeout / interrupt before connection completley established? */
 632         if (f == NULL)
 633                 goto failure;
 634
 635         if (!sigalrm) {
 636                 /* check the status of our files */
 637                 if (ferror(f))
 638                         warn("%s", URL);
 639                 if (ferror(of))
 640                         warn("%s", path);
 641                 if (ferror(f) || ferror(of))
 642                         goto failure;
 643         }
 644
 645         /* did the transfer complete normally? */
 646         if (us.size != -1 && count < us.size) {
 647                 warnx("%s appears to be truncated: %lld/%lld bytes",
 648                     path, (long long)count, (long long)us.size);
 649                 goto failure_keep;
 650         }
 651
 652         /*
 653          * If the transfer timed out and we didn't know how much to
 654          * expect, assume the worst (i.e. we didn't get all of it)
 655          */
 656         if (sigalrm && us.size == -1) {
 657                 warnx("%s may be truncated", path);
 658                 goto failure_keep;
 659         }
 660
 661  success:
 662         r = 0;
 663         if (tmppath != NULL && rename(tmppath, path) == -1) {
 664                 warn("%s: rename()", path);
 665                 goto failure_keep;
 666         }
 667         goto done;
 668  failure:
 669         if (of && of != stdout && !R_flag && !r_flag)
 670                 if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
 671                         unlink(tmppath ? tmppath : path);
 672         if (R_flag && tmppath != NULL && sb.st_size == -1)
 673                 rename(tmppath, path); /* ignore errors here */
 674  failure_keep:
 675         r = -1;
 676         goto done;
 677  done:
 678         if (f)
 679                 fclose(f);
 680         if (of && of != stdout)
 681                 fclose(of);
 682         if (url)
 683                 fetchFreeURL(url);
 684         if (tmppath != NULL)
 685                 free(tmppath);
 686         return r;
 687 }
 688
 689 static void
 690 usage(void)
 691 {
 692         fprintf(stderr, "%s\n%s\n%s\n",
 693             "usage: fetch [-146AFMPRUadlmnpqrsv] [-N netrc] [-o outputfile]",
 694             "             [-S bytes] [-B bytes] [-T seconds] [-w seconds]",
 695             "             [-h host -f file [-c dir] | URL ...]");
 696 }
 697
 698
 699 /*
 700  * Entry point
 701  */
 702 int
 703 main(int argc, char *argv[])
 704 {
 705         struct stat sb;
 706         struct sigaction sa;
 707         const char *p, *s;
 708         char *end, *q;
 709         int c, e, r;
 710
 711         while ((c = getopt(argc, argv,
 712             "146AaB:bc:dFf:Hh:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
 713                 switch (c) {
 714                 case '1':
 715                         once_flag = 1;
 716                         break;
 717                 case '4':
 718                         family = PF_INET;
 719                         break;
 720                 case '6':
 721                         family = PF_INET6;
 722                         break;
 723                 case 'A':
 724                         A_flag = 1;
 725                         break;
 726                 case 'a':
 727                         a_flag = 1;
 728                         break;
 729                 case 'B':
 730                         B_size = (off_t)strtol(optarg, &end, 10);
 731                         if (*optarg == '\0' || *end != '\0')
 732                                 errx(1, "invalid buffer size (%s)", optarg);
 733                         break;
 734                 case 'b':
 735                         warnx("warning: the -b option is deprecated");
 736                         b_flag = 1;
 737                         break;
 738                 case 'c':
 739                         c_dirname = optarg;
 740                         break;
 741                 case 'd':
 742                         d_flag = 1;
 743                         break;
 744                 case 'F':
 745                         F_flag = 1;
 746                         break;
 747                 case 'f':
 748                         f_filename = optarg;
 749                         break;
 750                 case 'H':
 751                         warnx("the -H option is now implicit, "
 752                             "use -U to disable");
 753                         break;
 754                 case 'h':
 755                         h_hostname = optarg;
 756                         break;
 757                 case 'l':
 758                         l_flag = 1;
 759                         break;
 760                 case 'o':
 761                         o_flag = 1;
 762                         o_filename = optarg;
 763                         break;
 764                 case 'M':
 765                 case 'm':
 766                         if (r_flag)
 767                                 errx(1, "the -m and -r flags "
 768                                     "are mutually exclusive");
 769                         m_flag = 1;
 770                         break;
 771                 case 'N':
 772                         N_filename = optarg;
 773                         break;
 774                 case 'n':
 775                         n_flag = 1;
 776                         break;
 777                 case 'P':
 778                 case 'p':
 779                         p_flag = 1;
 780                         break;
 781                 case 'q':
 782                         v_level = 0;
 783                         break;
 784                 case 'R':
 785                         R_flag = 1;
 786                         break;
 787                 case 'r':
 788                         if (m_flag)
 789                                 errx(1, "the -m and -r flags "
 790                                     "are mutually exclusive");
 791                         r_flag = 1;
 792                         break;
 793                 case 'S':
 794                         S_size = (off_t)strtol(optarg, &end, 10);
 795                         if (*optarg == '\0' || *end != '\0')
 796                                 errx(1, "invalid size (%s)", optarg);
 797                         break;
 798                 case 's':
 799                         s_flag = 1;
 800                         break;
 801                 case 'T':
 802                         T_secs = strtol(optarg, &end, 10);
 803                         if (*optarg == '\0' || *end != '\0')
 804                                 errx(1, "invalid timeout (%s)", optarg);
 805                         break;
 806                 case 't':
 807                         t_flag = 1;
 808                         warnx("warning: the -t option is deprecated");
 809                         break;
 810                 case 'U':
 811                         U_flag = 1;
 812                         break;
 813                 case 'v':
 814                         v_level++;
 815                         break;
 816                 case 'w':
 817                         a_flag = 1;
 818                         w_secs = strtol(optarg, &end, 10);
 819                         if (*optarg == '\0' || *end != '\0')
 820                                 errx(1, "invalid delay (%s)", optarg);
 821                         break;
 822                 default:
 823                         usage();
 824                         exit(EX_USAGE);
 825                 }
 826
 827         argc -= optind;
 828         argv += optind;
 829
 830         if (h_hostname || f_filename || c_dirname) {
 831                 if (!h_hostname || !f_filename || argc) {
 832                         usage();
 833                         exit(EX_USAGE);
 834                 }
 835                 /* XXX this is a hack. */
 836                 if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
 837                         errx(1, "invalid hostname");
 838                 if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
 839                     c_dirname ? c_dirname : "", f_filename) == -1)
 840                         errx(1, "%s", strerror(ENOMEM));
 841                 argc++;
 842         }
 843
 844         if (!argc) {
 845                 usage();
 846                 exit(EX_USAGE);
 847         }
 848
 849         /* allocate buffer */
 850         if (B_size < MINBUFSIZE)
 851                 B_size = MINBUFSIZE;
 852         if ((buf = malloc(B_size)) == NULL)
 853                 errx(1, "%s", strerror(ENOMEM));
 854
 855         /* timeouts */
 856         if ((s = getenv("FTP_TIMEOUT")) != NULL) {
 857                 ftp_timeout = strtol(s, &end, 10);
 858                 if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
 859                         warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
 860                         ftp_timeout = 0;
 861                 }
 862         }
 863         if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
 864                 http_timeout = strtol(s, &end, 10);
 865                 if (*s == '\0' || *end != '\0' || http_timeout < 0) {
 866                         warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
 867                         http_timeout = 0;
 868                 }
 869         }
 870
 871         /* signal handling */
 872         sa.sa_flags = 0;
 873         sa.sa_handler = sig_handler;
 874         sigemptyset(&sa.sa_mask);
 875         sigaction(SIGALRM, &sa, NULL);
 876         sa.sa_flags = SA_RESETHAND;
 877         sigaction(SIGINT, &sa, NULL);
 878         fetchRestartCalls = 0;
 879
 880         /* output file */
 881         if (o_flag) {
 882                 if (strcmp(o_filename, "-") == 0) {
 883                         o_stdout = 1;
 884                 } else if (stat(o_filename, &sb) == -1) {
 885                         if (errno == ENOENT) {
 886                                 if (argc > 1)
 887                                         errx(EX_USAGE, "%s is not a directory",
 888                                             o_filename);
 889                         } else {
 890                                 err(EX_IOERR, "%s", o_filename);
 891                         }
 892                 } else {
 893                         if (sb.st_mode & S_IFDIR)
 894                                 o_directory = 1;
 895                 }
 896         }
 897
 898         /* check if output is to a tty (for progress report) */
 899         v_tty = isatty(STDERR_FILENO);
 900         if (v_tty)
 901                 pgrp = getpgrp();
 902
 903         r = 0;
 904
 905         /* authentication */
 906         if (v_tty)
 907                 fetchAuthMethod = query_auth;
 908         if (N_filename != NULL) {
 909                 if (setenv("NETRC", N_filename, 1) == -1)
 910                         err(1, "setenv: cannot set NETRC=%s", N_filename);
 911         }
 912
 913         while (argc) {
 914                 if ((p = strrchr(*argv, '/')) == NULL)
 915                         p = *argv;
 916                 else
 917                         p++;
 918
 919                 if (!*p)
 920                         p = "fetch.out";
 921
 922                 fetchLastErrCode = 0;
 923
 924                 if (o_flag) {
 925                         if (o_stdout) {
 926                                 e = fetch(*argv, "-");
 927                         } else if (o_directory) {
 928                                 asprintf(&q, "%s/%s", o_filename, p);
 929                                 e = fetch(*argv, q);
 930                                 free(q);
 931                         } else {
 932                                 e = fetch(*argv, o_filename);
 933                         }
 934                 } else {
 935                         e = fetch(*argv, p);
 936                 }
 937
 938                 if (sigint)
 939                         kill(getpid(), SIGINT);
 940
 941                 if (e == 0 && once_flag)
 942                         exit(0);
 943
 944                 if (e) {
 945                         r = 1;
 946                         if ((fetchLastErrCode
 947                             && fetchLastErrCode != FETCH_UNAVAIL
 948                             && fetchLastErrCode != FETCH_MOVED
 949                             && fetchLastErrCode != FETCH_URL
 950                             && fetchLastErrCode != FETCH_RESOLV
 951                             && fetchLastErrCode != FETCH_UNKNOWN)) {
 952                                 if (w_secs && v_level)
 953                                         fprintf(stderr, "Waiting %ld seconds "
 954                                             "before retrying\n", w_secs);
 955                                 if (w_secs)
 956                                         sleep(w_secs);
 957                                 if (a_flag)
 958                                         continue;
 959                         }
 960                 }
 961
 962                 argc--, argv++;
 963         }
 964
 965         exit(r);
 966 }