usr.bin/fetch/fetch.c

   1 /*-
   2  * Copyright (c) 2000-2011 Dag-Erling Smørgrav
   3  * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer
  11  *    in this position and unchanged.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 __FBSDID("$FreeBSD$");
  32
  33 #include <sys/param.h>
  34 #include <sys/socket.h>
  35 #include <sys/stat.h>
  36 #include <sys/time.h>
  37
  38 #include <ctype.h>
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <getopt.h>
  42 #include <signal.h>
  43 #include <stdint.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <termios.h>
  48 #include <unistd.h>
  49
  50 #include <fetch.h>
  51
  52 #define MINBUFSIZE      4096
  53 #define TIMEOUT         120
  54
  55 /* Option flags */
  56 static int       A_flag;        /*    -A: do not follow 302 redirects */
  57 static int       a_flag;        /*    -a: auto retry */
  58 static off_t     B_size;        /*    -B: buffer size */
  59 static int       b_flag;        /*!   -b: workaround TCP bug */
  60 static char    *c_dirname;      /*    -c: remote directory */
  61 static int       d_flag;        /*    -d: direct connection */
  62 static int       F_flag;        /*    -F: restart without checking mtime  */
  63 static char     *f_filename;    /*    -f: file to fetch */
  64 static char     *h_hostname;    /*    -h: host to fetch from */
  65 static int       i_flag;        /*    -i: specify file for mtime comparison */
  66 static char     *i_filename;    /*        name of input file */
  67 static int       l_flag;        /*    -l: link rather than copy file: URLs */
  68 static int       m_flag;        /* -[Mm]: mirror mode */
  69 static char     *N_filename;    /*    -N: netrc file name */
  70 static int       n_flag;        /*    -n: do not preserve modification time */
  71 static int       o_flag;        /*    -o: specify output file */
  72 static int       o_directory;   /*        output file is a directory */
  73 static char     *o_filename;    /*        name of output file */
  74 static int       o_stdout;      /*        output file is stdout */
  75 static int       once_flag;     /*    -1: stop at first successful file */
  76 static int       p_flag;        /* -[Pp]: use passive FTP */
  77 static int       R_flag;        /*    -R: don't delete partial files */
  78 static int       r_flag;        /*    -r: restart previous transfer */
  79 static off_t     S_size;        /*    -S: require size to match */
  80 static int       s_flag;        /*    -s: show size, don't fetch */
  81 static long      T_secs;        /*    -T: transfer timeout in seconds */
  82 static int       t_flag;        /*!   -t: workaround TCP bug */
  83 static int       U_flag;        /*    -U: do not use high ports */
  84 static int       v_level = 1;   /*    -v: verbosity level */
  85 static int       v_tty;         /*        stdout is a tty */
  86 static pid_t     pgrp;          /*        our process group */
  87 static long      w_secs;        /*    -w: retry delay */
  88 static int       family = PF_UNSPEC;    /* -[46]: address family to use */
  89
  90 static int       sigalrm;       /* SIGALRM received */
  91 static int       siginfo;       /* SIGINFO received */
  92 static int       sigint;        /* SIGINT received */
  93
  94 static long      ftp_timeout = TIMEOUT; /* default timeout for FTP transfers */
  95 static long      http_timeout = TIMEOUT;/* default timeout for HTTP transfers */
  96 static char     *buf;           /* transfer buffer */
  97
  98 enum options
  99 {
 100         OPTION_BIND_ADDRESS,
 101         OPTION_NO_FTP_PASSIVE_MODE,
 102         OPTION_HTTP_REFERER,
 103         OPTION_HTTP_USER_AGENT,
 104         OPTION_NO_PROXY,
 105         OPTION_SSL_ALLOW_SSL2,
 106         OPTION_SSL_CA_CERT_FILE,
 107         OPTION_SSL_CA_CERT_PATH,
 108         OPTION_SSL_CLIENT_CERT_FILE,
 109         OPTION_SSL_CLIENT_KEY_FILE,
 110         OPTION_SSL_CRL_FILE,
 111         OPTION_SSL_NO_SSL3,
 112         OPTION_SSL_NO_TLS1,
 113         OPTION_SSL_NO_VERIFY_HOSTNAME,
 114         OPTION_SSL_NO_VERIFY_PEER
 115 };
 116
 117
 118 static struct option longopts[] =
 119 {
 120         /* mapping to single character argument */
 121         { "one-file", no_argument, NULL, '1' },
 122         { "ipv4-only", no_argument, NULL, '4' },
 123         { "ipv6-only", no_argument, NULL, '6' },
 124         { "no-redirect", no_argument, NULL, 'A' },
 125         { "retry", no_argument, NULL, 'a' },
 126         { "buffer-size", required_argument, NULL, 'B' },
 127         /* -c not mapped, since it's deprecated */
 128         { "direct", no_argument, NULL, 'd' },
 129         { "force-restart", no_argument, NULL, 'F' },
 130         /* -f not mapped, since it's deprecated */
 131         /* -h not mapped, since it's deprecated */
 132         { "if-modified-since", required_argument, NULL, 'i' },
 133         { "symlink", no_argument, NULL, 'l' },
 134         /* -M not mapped since it's the same as -m */
 135         { "mirror", no_argument, NULL, 'm' },
 136         { "netrc", required_argument, NULL, 'N' },
 137         { "no-mtime", no_argument, NULL, 'n' },
 138         { "output", required_argument, NULL, 'o' },
 139         /* -P not mapped since it's the same as -p */
 140         { "passive", no_argument, NULL, 'p' },
 141         { "quiet", no_argument, NULL, 'q' },
 142         { "keep-output", no_argument, NULL, 'R' },
 143         { "restart", no_argument, NULL, 'r' },
 144         { "require-size", required_argument, NULL, 'S' },
 145         { "print-size", no_argument, NULL, 's' },
 146         { "timeout", required_argument, NULL, 'T' },
 147         { "passive-portrange-default", no_argument, NULL, 'T' },
 148         { "verbose", no_argument, NULL, 'v' },
 149         { "retry-delay", required_argument, NULL, 'w' },
 150
 151         /* options without a single character equivalent */
 152         { "bind-address", required_argument, NULL, OPTION_BIND_ADDRESS },
 153         { "no-passive", no_argument, NULL, OPTION_NO_FTP_PASSIVE_MODE },
 154         { "referer", required_argument, NULL, OPTION_HTTP_REFERER },
 155         { "user-agent", required_argument, NULL, OPTION_HTTP_USER_AGENT },
 156         { "no-proxy", required_argument, NULL, OPTION_NO_PROXY },
 157         { "allow-sslv2", no_argument, NULL, OPTION_SSL_ALLOW_SSL2 },
 158         { "ca-cert", required_argument, NULL, OPTION_SSL_CA_CERT_FILE },
 159         { "ca-path", required_argument, NULL, OPTION_SSL_CA_CERT_PATH },
 160         { "cert", required_argument, NULL, OPTION_SSL_CLIENT_CERT_FILE },
 161         { "key", required_argument, NULL, OPTION_SSL_CLIENT_KEY_FILE },
 162         { "crl", required_argument, NULL, OPTION_SSL_CRL_FILE },
 163         { "no-sslv3", no_argument, NULL, OPTION_SSL_NO_SSL3 },
 164         { "no-tlsv1", no_argument, NULL, OPTION_SSL_NO_TLS1 },
 165         { "no-verify-hostname", no_argument, NULL, OPTION_SSL_NO_VERIFY_HOSTNAME },
 166         { "no-verify-peer", no_argument, NULL, OPTION_SSL_NO_VERIFY_PEER },
 167
 168         { NULL, 0, NULL, 0 }
 169 };
 170
 171 /*
 172  * Signal handler
 173  */
 174 static void
 175 sig_handler(int sig)
 176 {
 177         switch (sig) {
 178         case SIGALRM:
 179                 sigalrm = 1;
 180                 break;
 181         case SIGINFO:
 182                 siginfo = 1;
 183                 break;
 184         case SIGINT:
 185                 sigint = 1;
 186                 break;
 187         }
 188 }
 189
 190 struct xferstat {
 191         char             name[64];
 192         struct timeval   start;         /* start of transfer */
 193         struct timeval   last;          /* time of last update */
 194         struct timeval   last2;         /* time of previous last update */
 195         off_t            size;          /* size of file per HTTP hdr */
 196         off_t            offset;        /* starting offset in file */
 197         off_t            rcvd;          /* bytes already received */
 198         off_t            lastrcvd;      /* bytes received since last update */
 199 };
 200
 201 /*
 202  * Compute and display ETA
 203  */
 204 static const char *
 205 stat_eta(struct xferstat *xs)
 206 {
 207         static char str[16];
 208         long elapsed, eta;
 209         off_t received, expected;
 210
 211         elapsed = xs->last.tv_sec - xs->start.tv_sec;
 212         received = xs->rcvd - xs->offset;
 213         expected = xs->size - xs->rcvd;
 214         eta = (long)((double)elapsed * expected / received);
 215         if (eta > 3600)
 216                 snprintf(str, sizeof str, "%02ldh%02ldm",
 217                     eta / 3600, (eta % 3600) / 60);
 218         else if (eta > 0)
 219                 snprintf(str, sizeof str, "%02ldm%02lds",
 220                     eta / 60, eta % 60);
 221         else
 222                 snprintf(str, sizeof str, "%02ldm%02lds",
 223                     elapsed / 60, elapsed % 60);
 224         return (str);
 225 }
 226
 227 /*
 228  * Format a number as "xxxx YB" where Y is ' ', 'k', 'M'...
 229  */
 230 static const char *prefixes = " kMGTP";
 231 static const char *
 232 stat_bytes(off_t bytes)
 233 {
 234         static char str[16];
 235         const char *prefix = prefixes;
 236
 237         while (bytes > 9999 && prefix[1] != '\0') {
 238                 bytes /= 1024;
 239                 prefix++;
 240         }
 241         snprintf(str, sizeof str, "%4jd %cB", (intmax_t)bytes, *prefix);
 242         return (str);
 243 }
 244
 245 /*
 246  * Compute and display transfer rate
 247  */
 248 static const char *
 249 stat_bps(struct xferstat *xs)
 250 {
 251         static char str[16];
 252         double delta, bps;
 253
 254         delta = (xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
 255             - (xs->last2.tv_sec + (xs->last2.tv_usec / 1.e6));
 256
 257         if (delta == 0.0) {
 258                 snprintf(str, sizeof str, "?? Bps");
 259         } else {
 260                 bps = (xs->rcvd - xs->lastrcvd) / delta;
 261                 snprintf(str, sizeof str, "%sps", stat_bytes((off_t)bps));
 262         }
 263         return (str);
 264 }
 265
 266 /*
 267  * Update the stats display
 268  */
 269 static void
 270 stat_display(struct xferstat *xs, int force)
 271 {
 272         struct timeval now;
 273         int ctty_pgrp;
 274
 275         /* check if we're the foreground process */
 276         if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
 277             (pid_t)ctty_pgrp != pgrp)
 278                 return;
 279
 280         gettimeofday(&now, NULL);
 281         if (!force && now.tv_sec <= xs->last.tv_sec)
 282                 return;
 283         xs->last2 = xs->last;
 284         xs->last = now;
 285
 286         fprintf(stderr, "\r%-46.46s", xs->name);
 287         if (xs->size <= 0) {
 288                 setproctitle("%s [%s]", xs->name, stat_bytes(xs->rcvd));
 289                 fprintf(stderr, "        %s", stat_bytes(xs->rcvd));
 290         } else {
 291                 setproctitle("%s [%d%% of %s]", xs->name,
 292                     (int)((100.0 * xs->rcvd) / xs->size),
 293                     stat_bytes(xs->size));
 294                 fprintf(stderr, "%3d%% of %s",
 295                     (int)((100.0 * xs->rcvd) / xs->size),
 296                     stat_bytes(xs->size));
 297         }
 298         if (force == 2) {
 299                 xs->lastrcvd = xs->offset;
 300                 xs->last2 = xs->start;
 301         }
 302         fprintf(stderr, " %s", stat_bps(xs));
 303         if ((xs->size > 0 && xs->rcvd > 0 &&
 304              xs->last.tv_sec >= xs->start.tv_sec + 3) ||
 305             force == 2)
 306                 fprintf(stderr, " %s", stat_eta(xs));
 307         xs->lastrcvd = xs->rcvd;
 308 }
 309
 310 /*
 311  * Initialize the transfer statistics
 312  */
 313 static void
 314 stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
 315 {
 316         snprintf(xs->name, sizeof xs->name, "%s", name);
 317         gettimeofday(&xs->start, NULL);
 318         xs->last.tv_sec = xs->last.tv_usec = 0;
 319         xs->size = size;
 320         xs->offset = offset;
 321         xs->rcvd = offset;
 322         xs->lastrcvd = offset;
 323         if (v_tty && v_level > 0)
 324                 stat_display(xs, 1);
 325         else if (v_level > 0)
 326                 fprintf(stderr, "%-46s", xs->name);
 327 }
 328
 329 /*
 330  * Update the transfer statistics
 331  */
 332 static void
 333 stat_update(struct xferstat *xs, off_t rcvd)
 334 {
 335         xs->rcvd = rcvd;
 336         if (v_tty && v_level > 0)
 337                 stat_display(xs, 0);
 338 }
 339
 340 /*
 341  * Finalize the transfer statistics
 342  */
 343 static void
 344 stat_end(struct xferstat *xs)
 345 {
 346         gettimeofday(&xs->last, NULL);
 347         if (v_tty && v_level > 0) {
 348                 stat_display(xs, 2);
 349                 putc('\n', stderr);
 350         } else if (v_level > 0) {
 351                 fprintf(stderr, "        %s %s\n",
 352                     stat_bytes(xs->size), stat_bps(xs));
 353         }
 354 }
 355
 356 /*
 357  * Ask the user for authentication details
 358  */
 359 static int
 360 query_auth(struct url *URL)
 361 {
 362         struct termios tios;
 363         tcflag_t saved_flags;
 364         int i, nopwd;
 365
 366         fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
 367             URL->scheme, URL->host, URL->port);
 368
 369         fprintf(stderr, "Login: ");
 370         if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
 371                 return (-1);
 372         for (i = strlen(URL->user); i >= 0; --i)
 373                 if (URL->user[i] == '\r' || URL->user[i] == '\n')
 374                         URL->user[i] = '\0';
 375
 376         fprintf(stderr, "Password: ");
 377         if (tcgetattr(STDIN_FILENO, &tios) == 0) {
 378                 saved_flags = tios.c_lflag;
 379                 tios.c_lflag &= ~ECHO;
 380                 tios.c_lflag |= ECHONL|ICANON;
 381                 tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
 382                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 383                 tios.c_lflag = saved_flags;
 384                 tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
 385         } else {
 386                 nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
 387         }
 388         if (nopwd)
 389                 return (-1);
 390         for (i = strlen(URL->pwd); i >= 0; --i)
 391                 if (URL->pwd[i] == '\r' || URL->pwd[i] == '\n')
 392                         URL->pwd[i] = '\0';
 393
 394         return (0);
 395 }
 396
 397 /*
 398  * Fetch a file
 399  */
 400 static int
 401 fetch(char *URL, const char *path)
 402 {
 403         struct url *url;
 404         struct url_stat us;
 405         struct stat sb, nsb;
 406         struct xferstat xs;
 407         FILE *f, *of;
 408         size_t size, readcnt, wr;
 409         off_t count;
 410         char flags[8];
 411         const char *slash;
 412         char *tmppath;
 413         int r;
 414         unsigned timeout;
 415         char *ptr;
 416
 417         f = of = NULL;
 418         tmppath = NULL;
 419
 420         timeout = 0;
 421         *flags = 0;
 422         count = 0;
 423
 424         /* set verbosity level */
 425         if (v_level > 1)
 426                 strcat(flags, "v");
 427         if (v_level > 2)
 428                 fetchDebug = 1;
 429
 430         /* parse URL */
 431         url = NULL;
 432         if (*URL == '\0') {
 433                 warnx("empty URL");
 434                 goto failure;
 435         }
 436         if ((url = fetchParseURL(URL)) == NULL) {
 437                 warnx("%s: parse error", URL);
 438                 goto failure;
 439         }
 440
 441         /* if no scheme was specified, take a guess */
 442         if (!*url->scheme) {
 443                 if (!*url->host)
 444                         strcpy(url->scheme, SCHEME_FILE);
 445                 else if (strncasecmp(url->host, "ftp.", 4) == 0)
 446                         strcpy(url->scheme, SCHEME_FTP);
 447                 else if (strncasecmp(url->host, "www.", 4) == 0)
 448                         strcpy(url->scheme, SCHEME_HTTP);
 449         }
 450
 451         /* common flags */
 452         switch (family) {
 453         case PF_INET:
 454                 strcat(flags, "4");
 455                 break;
 456         case PF_INET6:
 457                 strcat(flags, "6");
 458                 break;
 459         }
 460
 461         /* FTP specific flags */
 462         if (strcmp(url->scheme, SCHEME_FTP) == 0) {
 463                 if (p_flag)
 464                         strcat(flags, "p");
 465                 if (d_flag)
 466                         strcat(flags, "d");
 467                 if (U_flag)
 468                         strcat(flags, "l");
 469                 timeout = T_secs ? T_secs : ftp_timeout;
 470         }
 471
 472         /* HTTP specific flags */
 473         if (strcmp(url->scheme, SCHEME_HTTP) == 0 ||
 474             strcmp(url->scheme, SCHEME_HTTPS) == 0) {
 475                 if (d_flag)
 476                         strcat(flags, "d");
 477                 if (A_flag)
 478                         strcat(flags, "A");
 479                 timeout = T_secs ? T_secs : http_timeout;
 480                 if (i_flag) {
 481                         if (stat(i_filename, &sb)) {
 482                                 warn("%s: stat()", i_filename);
 483                                 goto failure;
 484                         }
 485                         url->ims_time = sb.st_mtime;
 486                         strcat(flags, "i");
 487                 }
 488         }
 489
 490         /* set the protocol timeout. */
 491         fetchTimeout = timeout;
 492
 493         /* just print size */
 494         if (s_flag) {
 495                 if (timeout)
 496                         alarm(timeout);
 497                 r = fetchStat(url, &us, flags);
 498                 if (timeout)
 499                         alarm(0);
 500                 if (sigalrm || sigint)
 501                         goto signal;
 502                 if (r == -1) {
 503                         warnx("%s", fetchLastErrString);
 504                         goto failure;
 505                 }
 506                 if (us.size == -1)
 507                         printf("Unknown\n");
 508                 else
 509                         printf("%jd\n", (intmax_t)us.size);
 510                 goto success;
 511         }
 512
 513         /*
 514          * If the -r flag was specified, we have to compare the local
 515          * and remote files, so we should really do a fetchStat()
 516          * first, but I know of at least one HTTP server that only
 517          * sends the content size in response to GET requests, and
 518          * leaves it out of replies to HEAD requests.  Also, in the
 519          * (frequent) case that the local and remote files match but
 520          * the local file is truncated, we have sufficient information
 521          * before the compare to issue a correct request.  Therefore,
 522          * we always issue a GET request as if we were sure the local
 523          * file was a truncated copy of the remote file; we can drop
 524          * the connection later if we change our minds.
 525          */
 526         sb.st_size = -1;
 527         if (!o_stdout) {
 528                 r = stat(path, &sb);
 529                 if (r == 0 && r_flag && S_ISREG(sb.st_mode)) {
 530                         url->offset = sb.st_size;
 531                 } else if (r == -1 || !S_ISREG(sb.st_mode)) {
 532                         /*
 533                          * Whatever value sb.st_size has now is either
 534                          * wrong (if stat(2) failed) or irrelevant (if the
 535                          * path does not refer to a regular file)
 536                          */
 537                         sb.st_size = -1;
 538                 }
 539                 if (r == -1 && errno != ENOENT) {
 540                         warnx("%s: stat()", path);
 541                         goto failure;
 542                 }
 543         }
 544
 545         /* start the transfer */
 546         if (timeout)
 547                 alarm(timeout);
 548         f = fetchXGet(url, &us, flags);
 549         if (timeout)
 550                 alarm(0);
 551         if (sigalrm || sigint)
 552                 goto signal;
 553         if (f == NULL) {
 554                 warnx("%s: %s", URL, fetchLastErrString);
 555                 if (i_flag && strcmp(url->scheme, SCHEME_HTTP) == 0
 556                     && fetchLastErrCode == FETCH_OK
 557                     && strcmp(fetchLastErrString, "Not Modified") == 0) {
 558                         /* HTTP Not Modified Response, return OK. */
 559                         r = 0;
 560                         goto done;
 561                 } else
 562                         goto failure;
 563         }
 564         if (sigint)
 565                 goto signal;
 566
 567         /* check that size is as expected */
 568         if (S_size) {
 569                 if (us.size == -1) {
 570                         warnx("%s: size unknown", URL);
 571                 } else if (us.size != S_size) {
 572                         warnx("%s: size mismatch: expected %jd, actual %jd",
 573                             URL, (intmax_t)S_size, (intmax_t)us.size);
 574                         goto failure;
 575                 }
 576         }
 577
 578         /* symlink instead of copy */
 579         if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
 580                 if (symlink(url->doc, path) == -1) {
 581                         warn("%s: symlink()", path);
 582                         goto failure;
 583                 }
 584                 goto success;
 585         }
 586
 587         if (us.size == -1 && !o_stdout && v_level > 0)
 588                 warnx("%s: size of remote file is not known", URL);
 589         if (v_level > 1) {
 590                 if (sb.st_size != -1)
 591                         fprintf(stderr, "local size / mtime: %jd / %ld\n",
 592                             (intmax_t)sb.st_size, (long)sb.st_mtime);
 593                 if (us.size != -1)
 594                         fprintf(stderr, "remote size / mtime: %jd / %ld\n",
 595                             (intmax_t)us.size, (long)us.mtime);
 596         }
 597
 598         /* open output file */
 599         if (o_stdout) {
 600                 /* output to stdout */
 601                 of = stdout;
 602         } else if (r_flag && sb.st_size != -1) {
 603                 /* resume mode, local file exists */
 604                 if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
 605                         /* no match! have to refetch */
 606                         fclose(f);
 607                         /* if precious, warn the user and give up */
 608                         if (R_flag) {
 609                                 warnx("%s: local modification time "
 610                                     "does not match remote", path);
 611                                 goto failure_keep;
 612                         }
 613                 } else if (url->offset > sb.st_size) {
 614                         /* gap between what we asked for and what we got */
 615                         warnx("%s: gap in resume mode", URL);
 616                         fclose(of);
 617                         of = NULL;
 618                         /* picked up again later */
 619                 } else if (us.size != -1) {
 620                         if (us.size == sb.st_size)
 621                                 /* nothing to do */
 622                                 goto success;
 623                         if (sb.st_size > us.size) {
 624                                 /* local file too long! */
 625                                 warnx("%s: local file (%jd bytes) is longer "
 626                                     "than remote file (%jd bytes)", path,
 627                                     (intmax_t)sb.st_size, (intmax_t)us.size);
 628                                 goto failure;
 629                         }
 630                         /* we got it, open local file */
 631                         if ((of = fopen(path, "r+")) == NULL) {
 632                                 warn("%s: fopen()", path);
 633                                 goto failure;
 634                         }
 635                         /* check that it didn't move under our feet */
 636                         if (fstat(fileno(of), &nsb) == -1) {
 637                                 /* can't happen! */
 638                                 warn("%s: fstat()", path);
 639                                 goto failure;
 640                         }
 641                         if (nsb.st_dev != sb.st_dev ||
 642                             nsb.st_ino != sb.st_ino ||
 643                             nsb.st_size != sb.st_size) {
 644                                 warnx("%s: file has changed", URL);
 645                                 fclose(of);
 646                                 of = NULL;
 647                                 sb = nsb;
 648                                 /* picked up again later */
 649                         }
 650                 }
 651                 /* seek to where we left off */
 652                 if (of != NULL && fseeko(of, url->offset, SEEK_SET) != 0) {
 653                         warn("%s: fseeko()", path);
 654                         fclose(of);
 655                         of = NULL;
 656                         /* picked up again later */
 657                 }
 658         } else if (m_flag && sb.st_size != -1) {
 659                 /* mirror mode, local file exists */
 660                 if (sb.st_size == us.size && sb.st_mtime == us.mtime)
 661                         goto success;
 662         }
 663
 664         if (of == NULL) {
 665                 /*
 666                  * We don't yet have an output file; either this is a
 667                  * vanilla run with no special flags, or the local and
 668                  * remote files didn't match.
 669                  */
 670
 671                 if (url->offset > 0) {
 672                         /*
 673                          * We tried to restart a transfer, but for
 674                          * some reason gave up - so we have to restart
 675                          * from scratch if we want the whole file
 676                          */
 677                         url->offset = 0;
 678                         if ((f = fetchXGet(url, &us, flags)) == NULL) {
 679                                 warnx("%s: %s", URL, fetchLastErrString);
 680                                 goto failure;
 681                         }
 682                         if (sigint)
 683                                 goto signal;
 684                 }
 685
 686                 /* construct a temp file name */
 687                 if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
 688                         if ((slash = strrchr(path, '/')) == NULL)
 689                                 slash = path;
 690                         else
 691                                 ++slash;
 692                         asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
 693                             (int)(slash - path), path, slash);
 694                         if (tmppath != NULL) {
 695                                 if (mkstemps(tmppath, strlen(slash) + 1) == -1) {
 696                                         warn("%s: mkstemps()", path);
 697                                         goto failure;
 698                                 }
 699                                 of = fopen(tmppath, "w");
 700                                 chown(tmppath, sb.st_uid, sb.st_gid);
 701                                 chmod(tmppath, sb.st_mode & ALLPERMS);
 702                         }
 703                 }
 704                 if (of == NULL)
 705                         of = fopen(path, "w");
 706                 if (of == NULL) {
 707                         warn("%s: open()", path);
 708                         goto failure;
 709                 }
 710         }
 711         count = url->offset;
 712
 713         /* start the counter */
 714         stat_start(&xs, path, us.size, count);
 715
 716         sigalrm = siginfo = sigint = 0;
 717
 718         /* suck in the data */
 719         signal(SIGINFO, sig_handler);
 720         while (!sigint) {
 721                 if (us.size != -1 && us.size - count < B_size &&
 722                     us.size - count >= 0)
 723                         size = us.size - count;
 724                 else
 725                         size = B_size;
 726                 if (siginfo) {
 727                         stat_end(&xs);
 728                         siginfo = 0;
 729                 }
 730
 731                 if (size == 0)
 732                         break;
 733
 734                 if ((readcnt = fread(buf, 1, size, f)) < size) {
 735                         if (ferror(f) && errno == EINTR && !sigint)
 736                                 clearerr(f);
 737                         else if (readcnt == 0)
 738                                 break;
 739                 }
 740
 741                 stat_update(&xs, count += readcnt);
 742                 for (ptr = buf; readcnt > 0; ptr += wr, readcnt -= wr)
 743                         if ((wr = fwrite(ptr, 1, readcnt, of)) < readcnt) {
 744                                 if (ferror(of) && errno == EINTR && !sigint)
 745                                         clearerr(of);
 746                                 else
 747                                         break;
 748                         }
 749                 if (readcnt != 0)
 750                         break;
 751         }
 752         if (!sigalrm)
 753                 sigalrm = ferror(f) && errno == ETIMEDOUT;
 754         signal(SIGINFO, SIG_DFL);
 755
 756         stat_end(&xs);
 757
 758         /*
 759          * If the transfer timed out or was interrupted, we still want to
 760          * set the mtime in case the file is not removed (-r or -R) and
 761          * the user later restarts the transfer.
 762          */
 763  signal:
 764         /* set mtime of local file */
 765         if (!n_flag && us.mtime && !o_stdout && of != NULL &&
 766             (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
 767                 struct timeval tv[2];
 768
 769                 fflush(of);
 770                 tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
 771                 tv[1].tv_sec = (long)us.mtime;
 772                 tv[0].tv_usec = tv[1].tv_usec = 0;
 773                 if (utimes(tmppath ? tmppath : path, tv))
 774                         warn("%s: utimes()", tmppath ? tmppath : path);
 775         }
 776
 777         /* timed out or interrupted? */
 778         if (sigalrm)
 779                 warnx("transfer timed out");
 780         if (sigint) {
 781                 warnx("transfer interrupted");
 782                 goto failure;
 783         }
 784
 785         /* timeout / interrupt before connection completley established? */
 786         if (f == NULL)
 787                 goto failure;
 788
 789         if (!sigalrm) {
 790                 /* check the status of our files */
 791                 if (ferror(f))
 792                         warn("%s", URL);
 793                 if (ferror(of))
 794                         warn("%s", path);
 795                 if (ferror(f) || ferror(of))
 796                         goto failure;
 797         }
 798
 799         /* did the transfer complete normally? */
 800         if (us.size != -1 && count < us.size) {
 801                 warnx("%s appears to be truncated: %jd/%jd bytes",
 802                     path, (intmax_t)count, (intmax_t)us.size);
 803                 goto failure_keep;
 804         }
 805
 806         /*
 807          * If the transfer timed out and we didn't know how much to
 808          * expect, assume the worst (i.e. we didn't get all of it)
 809          */
 810         if (sigalrm && us.size == -1) {
 811                 warnx("%s may be truncated", path);
 812                 goto failure_keep;
 813         }
 814
 815  success:
 816         r = 0;
 817         if (tmppath != NULL && rename(tmppath, path) == -1) {
 818                 warn("%s: rename()", path);
 819                 goto failure_keep;
 820         }
 821         goto done;
 822  failure:
 823         if (of && of != stdout && !R_flag && !r_flag)
 824                 if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
 825                         unlink(tmppath ? tmppath : path);
 826         if (R_flag && tmppath != NULL && sb.st_size == -1)
 827                 rename(tmppath, path); /* ignore errors here */
 828  failure_keep:
 829         r = -1;
 830         goto done;
 831  done:
 832         if (f)
 833                 fclose(f);
 834         if (of && of != stdout)
 835                 fclose(of);
 836         if (url)
 837                 fetchFreeURL(url);
 838         if (tmppath != NULL)
 839                 free(tmppath);
 840         return (r);
 841 }
 842
 843 static void
 844 usage(void)
 845 {
 846         fprintf(stderr, "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
 847 "usage: fetch [-146AadFlMmnPpqRrsUv] [--allow-sslv2] [-B bytes]",
 848 "       [--bind-address=host] [--ca-cert=file] [--ca-path=dir] [--cert=file]",
 849 "       [--crl=file] [-i file] [--key=file] [-N file] [--no-passive]",
 850 "       [--no-proxy=list] [--no-sslv3] [--no-tlsv1] [--no-verify-hostname]",
 851 "       [--no-verify-peer] [-o file] [--referer=URL] [-S bytes] [-T seconds]",
 852 "       [--user-agent=agent-string] [-w seconds] URL ...",
 853 "       fetch [-146AadFlMmnPpqRrsUv] [--allow-sslv2] [-B bytes]",
 854 "       [--bind-address=host] [--ca-cert=file] [--ca-path=dir] [--cert=file]",
 855 "       [--crl=file] [-i file] [--key=file] [-N file] [--no-passive]",
 856 "       [--no-proxy=list] [--no-sslv3] [--no-tlsv1] [--no-verify-hostname]",
 857 "       [--no-verify-peer] [-o file] [--referer=URL] [-S bytes] [-T seconds]",
 858 "       [--user-agent=agent-string] [-w seconds] -h host -f file [-c dir]");
 859 }
 860
 861
 862 /*
 863  * Entry point
 864  */
 865 int
 866 main(int argc, char *argv[])
 867 {
 868         struct stat sb;
 869         struct sigaction sa;
 870         const char *p, *s;
 871         char *end, *q;
 872         int c, e, r;
 873
 874
 875         while ((c = getopt_long(argc, argv,
 876             "146AaB:bc:dFf:Hh:i:lMmN:nPpo:qRrS:sT:tUvw:",
 877             longopts, NULL)) != -1)
 878                 switch (c) {
 879                 case '1':
 880                         once_flag = 1;
 881                         break;
 882                 case '4':
 883                         family = PF_INET;
 884                         break;
 885                 case '6':
 886                         family = PF_INET6;
 887                         break;
 888                 case 'A':
 889                         A_flag = 1;
 890                         break;
 891                 case 'a':
 892                         a_flag = 1;
 893                         break;
 894                 case 'B':
 895                         B_size = (off_t)strtol(optarg, &end, 10);
 896                         if (*optarg == '\0' || *end != '\0')
 897                                 errx(1, "invalid buffer size (%s)", optarg);
 898                         break;
 899                 case 'b':
 900                         warnx("warning: the -b option is deprecated");
 901                         b_flag = 1;
 902                         break;
 903                 case 'c':
 904                         c_dirname = optarg;
 905                         break;
 906                 case 'd':
 907                         d_flag = 1;
 908                         break;
 909                 case 'F':
 910                         F_flag = 1;
 911                         break;
 912                 case 'f':
 913                         f_filename = optarg;
 914                         break;
 915                 case 'H':
 916                         warnx("the -H option is now implicit, "
 917                             "use -U to disable");
 918                         break;
 919                 case 'h':
 920                         h_hostname = optarg;
 921                         break;
 922                 case 'i':
 923                         i_flag = 1;
 924                         i_filename = optarg;
 925                         break;
 926                 case 'l':
 927                         l_flag = 1;
 928                         break;
 929                 case 'o':
 930                         o_flag = 1;
 931                         o_filename = optarg;
 932                         break;
 933                 case 'M':
 934                 case 'm':
 935                         if (r_flag)
 936                                 errx(1, "the -m and -r flags "
 937                                     "are mutually exclusive");
 938                         m_flag = 1;
 939                         break;
 940                 case 'N':
 941                         N_filename = optarg;
 942                         break;
 943                 case 'n':
 944                         n_flag = 1;
 945                         break;
 946                 case 'P':
 947                 case 'p':
 948                         p_flag = 1;
 949                         break;
 950                 case 'q':
 951                         v_level = 0;
 952                         break;
 953                 case 'R':
 954                         R_flag = 1;
 955                         break;
 956                 case 'r':
 957                         if (m_flag)
 958                                 errx(1, "the -m and -r flags "
 959                                     "are mutually exclusive");
 960                         r_flag = 1;
 961                         break;
 962                 case 'S':
 963                         S_size = (off_t)strtol(optarg, &end, 10);
 964                         if (*optarg == '\0' || *end != '\0')
 965                                 errx(1, "invalid size (%s)", optarg);
 966                         break;
 967                 case 's':
 968                         s_flag = 1;
 969                         break;
 970                 case 'T':
 971                         T_secs = strtol(optarg, &end, 10);
 972                         if (*optarg == '\0' || *end != '\0')
 973                                 errx(1, "invalid timeout (%s)", optarg);
 974                         break;
 975                 case 't':
 976                         t_flag = 1;
 977                         warnx("warning: the -t option is deprecated");
 978                         break;
 979                 case 'U':
 980                         U_flag = 1;
 981                         break;
 982                 case 'v':
 983                         v_level++;
 984                         break;
 985                 case 'w':
 986                         a_flag = 1;
 987                         w_secs = strtol(optarg, &end, 10);
 988                         if (*optarg == '\0' || *end != '\0')
 989                                 errx(1, "invalid delay (%s)", optarg);
 990                         break;
 991                 case OPTION_BIND_ADDRESS:
 992                         setenv("FETCH_BIND_ADDRESS", optarg, 1);
 993                         break;
 994                 case OPTION_NO_FTP_PASSIVE_MODE:
 995                         setenv("FTP_PASSIVE_MODE", "no", 1);
 996                         break;
 997                 case OPTION_HTTP_REFERER:
 998                         setenv("HTTP_REFERER", optarg, 1);
 999                         break;
1000                 case OPTION_HTTP_USER_AGENT:
1001                         setenv("HTTP_USER_AGENT", optarg, 1);
1002                         break;
1003                 case OPTION_NO_PROXY:
1004                         setenv("NO_PROXY", optarg, 1);
1005                         break;
1006                 case OPTION_SSL_ALLOW_SSL2:
1007                         setenv("SSL_ALLOW_SSL2", "", 1);
1008                         break;
1009                 case OPTION_SSL_CA_CERT_FILE:
1010                         setenv("SSL_CA_CERT_FILE", optarg, 1);
1011                         break;
1012                 case OPTION_SSL_CA_CERT_PATH:
1013                         setenv("SSL_CA_CERT_PATH", optarg, 1);
1014                         break;
1015                 case OPTION_SSL_CLIENT_CERT_FILE:
1016                         setenv("SSL_CLIENT_CERT_FILE", optarg, 1);
1017                         break;
1018                 case OPTION_SSL_CLIENT_KEY_FILE:
1019                         setenv("SSL_CLIENT_KEY_FILE", optarg, 1);
1020                         break;
1021                 case OPTION_SSL_CRL_FILE:
1022                         setenv("SSL_CLIENT_CRL_FILE", optarg, 1);
1023                         break;
1024                 case OPTION_SSL_NO_SSL3:
1025                         setenv("SSL_NO_SSL3", "", 1);
1026                         break;
1027                 case OPTION_SSL_NO_TLS1:
1028                         setenv("SSL_NO_TLS1", "", 1);
1029                         break;
1030                 case OPTION_SSL_NO_VERIFY_HOSTNAME:
1031                         setenv("SSL_NO_VERIFY_HOSTNAME", "", 1);
1032                         break;
1033                 case OPTION_SSL_NO_VERIFY_PEER:
1034                         setenv("SSL_NO_VERIFY_PEER", "", 1);
1035                         break;
1036                 default:
1037                         usage();
1038                         exit(1);
1039                 }
1040
1041         argc -= optind;
1042         argv += optind;
1043
1044         if (h_hostname || f_filename || c_dirname) {
1045                 if (!h_hostname || !f_filename || argc) {
1046                         usage();
1047                         exit(1);
1048                 }
1049                 /* XXX this is a hack. */
1050                 if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
1051                         errx(1, "invalid hostname");
1052                 if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
1053                     c_dirname ? c_dirname : "", f_filename) == -1)
1054                         errx(1, "%s", strerror(ENOMEM));
1055                 argc++;
1056         }
1057
1058         if (!argc) {
1059                 usage();
1060                 exit(1);
1061         }
1062
1063         /* allocate buffer */
1064         if (B_size < MINBUFSIZE)
1065                 B_size = MINBUFSIZE;
1066         if ((buf = malloc(B_size)) == NULL)
1067                 errx(1, "%s", strerror(ENOMEM));
1068
1069         /* timeouts */
1070         if ((s = getenv("FTP_TIMEOUT")) != NULL) {
1071                 ftp_timeout = strtol(s, &end, 10);
1072                 if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
1073                         warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
1074                         ftp_timeout = 0;
1075                 }
1076         }
1077         if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
1078                 http_timeout = strtol(s, &end, 10);
1079                 if (*s == '\0' || *end != '\0' || http_timeout < 0) {
1080                         warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
1081                         http_timeout = 0;
1082                 }
1083         }
1084
1085         /* signal handling */
1086         sa.sa_flags = 0;
1087         sa.sa_handler = sig_handler;
1088         sigemptyset(&sa.sa_mask);
1089         sigaction(SIGALRM, &sa, NULL);
1090         sa.sa_flags = SA_RESETHAND;
1091         sigaction(SIGINT, &sa, NULL);
1092         fetchRestartCalls = 0;
1093
1094         /* output file */
1095         if (o_flag) {
1096                 if (strcmp(o_filename, "-") == 0) {
1097                         o_stdout = 1;
1098                 } else if (stat(o_filename, &sb) == -1) {
1099                         if (errno == ENOENT) {
1100                                 if (argc > 1)
1101                                         errx(1, "%s is not a directory",
1102                                             o_filename);
1103                         } else {
1104                                 err(1, "%s", o_filename);
1105                         }
1106                 } else {
1107                         if (sb.st_mode & S_IFDIR)
1108                                 o_directory = 1;
1109                 }
1110         }
1111
1112         /* check if output is to a tty (for progress report) */
1113         v_tty = isatty(STDERR_FILENO);
1114         if (v_tty)
1115                 pgrp = getpgrp();
1116
1117         r = 0;
1118
1119         /* authentication */
1120         if (v_tty)
1121                 fetchAuthMethod = query_auth;
1122         if (N_filename != NULL)
1123                 if (setenv("NETRC", N_filename, 1) == -1)
1124                         err(1, "setenv: cannot set NETRC=%s", N_filename);
1125
1126         while (argc) {
1127                 if ((p = strrchr(*argv, '/')) == NULL)
1128                         p = *argv;
1129                 else
1130                         p++;
1131
1132                 if (!*p)
1133                         p = "fetch.out";
1134
1135                 fetchLastErrCode = 0;
1136
1137                 if (o_flag) {
1138                         if (o_stdout) {
1139                                 e = fetch(*argv, "-");
1140                         } else if (o_directory) {
1141                                 asprintf(&q, "%s/%s", o_filename, p);
1142                                 e = fetch(*argv, q);
1143                                 free(q);
1144                         } else {
1145                                 e = fetch(*argv, o_filename);
1146                         }
1147                 } else {
1148                         e = fetch(*argv, p);
1149                 }
1150
1151                 if (sigint)
1152                         kill(getpid(), SIGINT);
1153
1154                 if (e == 0 && once_flag)
1155                         exit(0);
1156
1157                 if (e) {
1158                         r = 1;
1159                         if ((fetchLastErrCode
1160                             && fetchLastErrCode != FETCH_UNAVAIL
1161                             && fetchLastErrCode != FETCH_MOVED
1162                             && fetchLastErrCode != FETCH_URL
1163                             && fetchLastErrCode != FETCH_RESOLV
1164                             && fetchLastErrCode != FETCH_UNKNOWN)) {
1165                                 if (w_secs && v_level)
1166                                         fprintf(stderr, "Waiting %ld seconds "
1167                                             "before retrying\n", w_secs);
1168                                 if (w_secs)
1169                                         sleep(w_secs);
1170                                 if (a_flag)
1171                                         continue;
1172                         }
1173                 }
1174
1175                 argc--, argv++;
1176         }
1177
1178         exit(r);
1179 }