fetch.c revision 131052 
1/*-
2 * Copyright (c) 2000 Dag-Erling Co�dan Sm�rgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD: head/usr.bin/fetch/fetch.c 131052 2004-06-24 13:43:57Z des $");
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 */
54int	 A_flag;	/*    -A: do not follow 302 redirects */
55int	 a_flag;	/*    -a: auto retry */
56off_t	 B_size;	/*    -B: buffer size */
57int	 b_flag;	/*!   -b: workaround TCP bug */
58char    *c_dirname;	/*    -c: remote directory */
59int	 d_flag;	/*    -d: direct connection */
60int	 F_flag;	/*    -F: restart without checking mtime  */
61char	*f_filename;	/*    -f: file to fetch */
62char	*h_hostname;	/*    -h: host to fetch from */
63int	 l_flag;	/*    -l: link rather than copy file: URLs */
64int	 m_flag;	/* -[Mm]: mirror mode */
65char	*N_filename;	/*    -N: netrc file name */
66int	 n_flag;	/*    -n: do not preserve modification time */
67int	 o_flag;	/*    -o: specify output file */
68int	 o_directory;	/*        output file is a directory */
69char	*o_filename;	/*        name of output file */
70int	 o_stdout;	/*        output file is stdout */
71int	 once_flag;	/*    -1: stop at first successful file */
72int	 p_flag;	/* -[Pp]: use passive FTP */
73int	 R_flag;	/*    -R: don't delete partially transferred files */
74int	 r_flag;	/*    -r: restart previously interrupted transfer */
75off_t	 S_size;        /*    -S: require size to match */
76int	 s_flag;        /*    -s: show size, don't fetch */
77long	 T_secs = 120;	/*    -T: transfer timeout in seconds */
78int	 t_flag;	/*!   -t: workaround TCP bug */
79int	 U_flag;	/*    -U: do not use high ports */
80int	 v_level = 1;	/*    -v: verbosity level */
81int	 v_tty;		/*        stdout is a tty */
82pid_t	 pgrp;		/*        our process group */
83long	 w_secs;	/*    -w: retry delay */
84int	 family = PF_UNSPEC;	/* -[46]: address family to use */
85
86int	 sigalrm;	/* SIGALRM received */
87int	 siginfo;	/* SIGINFO received */
88int	 sigint;	/* SIGINT received */
89
90long	 ftp_timeout;	/* default timeout for FTP transfers */
91long	 http_timeout;	/* default timeout for HTTP transfers */
92char	*buf;		/* transfer buffer */
93
94
95/*
96 * Signal handler
97 */
98static void
99sig_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
114struct 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 */
126static const char *
127stat_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 */
149static const char *prefixes = " kMGTP";
150static const char *
151stat_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 */
167static const char *
168stat_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 */
187static void
188stat_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%-46s", xs->name);
204	if (xs->size <= 0) {
205		fprintf(stderr, "        %s", stat_bytes(xs->rcvd));
206	} else {
207		fprintf(stderr, "%3d%% of %s",
208		    (int)((100.0 * xs->rcvd) / xs->size),
209		    stat_bytes(xs->size));
210	}
211	fprintf(stderr, " %s", stat_bps(xs));
212	if (xs->size > 0 && xs->rcvd > 0 &&
213	    xs->last.tv_sec >= xs->start.tv_sec + 10)
214		fprintf(stderr, " %s", stat_eta(xs));
215}
216
217/*
218 * Initialize the transfer statistics
219 */
220static void
221stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
222{
223	snprintf(xs->name, sizeof xs->name, "%s", name);
224	gettimeofday(&xs->start, NULL);
225	xs->last.tv_sec = xs->last.tv_usec = 0;
226	xs->size = size;
227	xs->offset = offset;
228	xs->rcvd = offset;
229	if (v_tty && v_level > 0)
230		stat_display(xs, 1);
231	else if (v_level > 0)
232		fprintf(stderr, "%-46s", xs->name);
233}
234
235/*
236 * Update the transfer statistics
237 */
238static void
239stat_update(struct xferstat *xs, off_t rcvd)
240{
241	xs->rcvd = rcvd;
242	if (v_tty && v_level > 0)
243		stat_display(xs, 0);
244}
245
246/*
247 * Finalize the transfer statistics
248 */
249static void
250stat_end(struct xferstat *xs)
251{
252	gettimeofday(&xs->last, NULL);
253	if (v_tty && v_level > 0) {
254		stat_display(xs, 1);
255		putc('\n', stderr);
256	} else if (v_level > 0) {
257		fprintf(stderr, "        %s %s\n",
258		    stat_bytes(xs->size), stat_bps(xs));
259	}
260}
261
262/*
263 * Ask the user for authentication details
264 */
265static int
266query_auth(struct url *URL)
267{
268	struct termios tios;
269	tcflag_t saved_flags;
270	int i, nopwd;
271
272
273	fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
274	    URL->scheme, URL->host, URL->port);
275
276	fprintf(stderr, "Login: ");
277	if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
278		return -1;
279	for (i = 0; URL->user[i]; ++i)
280		if (isspace(URL->user[i]))
281			URL->user[i] = '\0';
282
283	fprintf(stderr, "Password: ");
284	if (tcgetattr(STDIN_FILENO, &tios) == 0) {
285		saved_flags = tios.c_lflag;
286		tios.c_lflag &= ~ECHO;
287		tios.c_lflag |= ECHONL|ICANON;
288		tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
289		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
290		tios.c_lflag = saved_flags;
291		tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
292	} else {
293		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
294	}
295	if (nopwd)
296		return -1;
297
298	for (i = 0; URL->pwd[i]; ++i)
299		if (isspace(URL->pwd[i]))
300			URL->pwd[i] = '\0';
301	return 0;
302}
303
304/*
305 * Fetch a file
306 */
307static int
308fetch(char *URL, const char *path)
309{
310	struct url *url;
311	struct url_stat us;
312	struct stat sb, nsb;
313	struct xferstat xs;
314	FILE *f, *of;
315	size_t size, wr;
316	off_t count;
317	char flags[8];
318	const char *slash;
319	char *tmppath;
320	int r;
321	unsigned timeout;
322	char *ptr;
323
324	f = of = NULL;
325	tmppath = NULL;
326
327	timeout = 0;
328	*flags = 0;
329	count = 0;
330
331	/* set verbosity level */
332	if (v_level > 1)
333		strcat(flags, "v");
334	if (v_level > 2)
335		fetchDebug = 1;
336
337	/* parse URL */
338	if ((url = fetchParseURL(URL)) == NULL) {
339		warnx("%s: parse error", URL);
340		goto failure;
341	}
342
343	/* if no scheme was specified, take a guess */
344	if (!*url->scheme) {
345		if (!*url->host)
346			strcpy(url->scheme, SCHEME_FILE);
347		else if (strncasecmp(url->host, "ftp.", 4) == 0)
348			strcpy(url->scheme, SCHEME_FTP);
349		else if (strncasecmp(url->host, "www.", 4) == 0)
350			strcpy(url->scheme, SCHEME_HTTP);
351	}
352
353	/* common flags */
354	switch (family) {
355	case PF_INET:
356		strcat(flags, "4");
357		break;
358	case PF_INET6:
359		strcat(flags, "6");
360		break;
361	}
362
363	/* FTP specific flags */
364	if (strcmp(url->scheme, "ftp") == 0) {
365		if (p_flag)
366			strcat(flags, "p");
367		if (d_flag)
368			strcat(flags, "d");
369		if (U_flag)
370			strcat(flags, "l");
371		timeout = T_secs ? T_secs : ftp_timeout;
372	}
373
374	/* HTTP specific flags */
375	if (strcmp(url->scheme, "http") == 0) {
376		if (d_flag)
377			strcat(flags, "d");
378		if (A_flag)
379			strcat(flags, "A");
380		timeout = T_secs ? T_secs : http_timeout;
381	}
382
383	/* set the protocol timeout. */
384	fetchTimeout = timeout;
385
386	/* just print size */
387	if (s_flag) {
388		if (timeout)
389			alarm(timeout);
390		r = fetchStat(url, &us, flags);
391		if (timeout)
392			alarm(0);
393		if (sigalrm || sigint)
394			goto signal;
395		if (r == -1) {
396			warnx("%s", fetchLastErrString);
397			goto failure;
398		}
399		if (us.size == -1)
400			printf("Unknown\n");
401		else
402			printf("%jd\n", (intmax_t)us.size);
403		goto success;
404	}
405
406	/*
407	 * If the -r flag was specified, we have to compare the local
408	 * and remote files, so we should really do a fetchStat()
409	 * first, but I know of at least one HTTP server that only
410	 * sends the content size in response to GET requests, and
411	 * leaves it out of replies to HEAD requests.  Also, in the
412	 * (frequent) case that the local and remote files match but
413	 * the local file is truncated, we have sufficient information
414	 * before the compare to issue a correct request.  Therefore,
415	 * we always issue a GET request as if we were sure the local
416	 * file was a truncated copy of the remote file; we can drop
417	 * the connection later if we change our minds.
418	 */
419	sb.st_size = -1;
420	if (!o_stdout && stat(path, &sb) == -1 && errno != ENOENT) {
421		warnx("%s: stat()", path);
422		goto failure;
423	}
424	if (!o_stdout && r_flag && S_ISREG(sb.st_mode))
425		url->offset = sb.st_size;
426
427	/* start the transfer */
428	if (timeout)
429		alarm(timeout);
430	f = fetchXGet(url, &us, flags);
431	if (timeout)
432		alarm(0);
433	if (sigalrm || sigint)
434		goto signal;
435	if (f == NULL) {
436		warnx("%s: %s", URL, fetchLastErrString);
437		goto failure;
438	}
439	if (sigint)
440		goto signal;
441
442	/* check that size is as expected */
443	if (S_size) {
444		if (us.size == -1) {
445			warnx("%s: size unknown", URL);
446		} else if (us.size != S_size) {
447			warnx("%s: size mismatch: expected %jd, actual %jd",
448			    URL, (intmax_t)S_size, (intmax_t)us.size);
449			goto failure;
450		}
451	}
452
453	/* symlink instead of copy */
454	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
455		if (symlink(url->doc, path) == -1) {
456			warn("%s: symlink()", path);
457			goto failure;
458		}
459		goto success;
460	}
461
462	if (us.size == -1 && !o_stdout && v_level > 0)
463		warnx("%s: size of remote file is not known", URL);
464	if (v_level > 1) {
465		if (sb.st_size != -1)
466			fprintf(stderr, "local size / mtime: %jd / %ld\n",
467			    (intmax_t)sb.st_size, (long)sb.st_mtime);
468		if (us.size != -1)
469			fprintf(stderr, "remote size / mtime: %jd / %ld\n",
470			    (intmax_t)us.size, (long)us.mtime);
471	}
472
473	/* open output file */
474	if (o_stdout) {
475		/* output to stdout */
476		of = stdout;
477	} else if (r_flag && sb.st_size != -1) {
478		/* resume mode, local file exists */
479		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
480			/* no match! have to refetch */
481			fclose(f);
482			/* if precious, warn the user and give up */
483			if (R_flag) {
484				warnx("%s: local modification time "
485				    "does not match remote", path);
486				goto failure_keep;
487			}
488		} else if (us.size != -1) {
489			if (us.size == sb.st_size)
490				/* nothing to do */
491				goto success;
492			if (sb.st_size > us.size) {
493				/* local file too long! */
494				warnx("%s: local file (%jd bytes) is longer "
495				    "than remote file (%jd bytes)", path,
496				    (intmax_t)sb.st_size, (intmax_t)us.size);
497				goto failure;
498			}
499			/* we got it, open local file */
500			if ((of = fopen(path, "a")) == NULL) {
501				warn("%s: fopen()", path);
502				goto failure;
503			}
504			/* check that it didn't move under our feet */
505			if (fstat(fileno(of), &nsb) == -1) {
506				/* can't happen! */
507				warn("%s: fstat()", path);
508				goto failure;
509			}
510			if (nsb.st_dev != sb.st_dev ||
511			    nsb.st_ino != nsb.st_ino ||
512			    nsb.st_size != sb.st_size) {
513				warnx("%s: file has changed", URL);
514				fclose(of);
515				of = NULL;
516				sb = nsb;
517			}
518		}
519	} else if (m_flag && sb.st_size != -1) {
520		/* mirror mode, local file exists */
521		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
522			goto success;
523	}
524
525	if (of == NULL) {
526		/*
527		 * We don't yet have an output file; either this is a
528		 * vanilla run with no special flags, or the local and
529		 * remote files didn't match.
530		 */
531
532		if (url->offset > 0) {
533			/*
534			 * We tried to restart a transfer, but for
535			 * some reason gave up - so we have to restart
536			 * from scratch if we want the whole file
537			 */
538			url->offset = 0;
539			if ((f = fetchXGet(url, &us, flags)) == NULL) {
540				warnx("%s: %s", URL, fetchLastErrString);
541				goto failure;
542			}
543			if (sigint)
544				goto signal;
545		}
546
547		/* construct a temp file name */
548		if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
549			if ((slash = strrchr(path, '/')) == NULL)
550				slash = path;
551			else
552				++slash;
553			asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
554			    (int)(slash - path), path, slash);
555			if (tmppath != NULL) {
556				mkstemps(tmppath, strlen(slash) + 1);
557				of = fopen(tmppath, "w");
558			}
559		}
560		if (of == NULL)
561			of = fopen(path, "w");
562		if (of == NULL) {
563			warn("%s: open()", path);
564			goto failure;
565		}
566	}
567	count = url->offset;
568
569	/* start the counter */
570	stat_start(&xs, path, us.size, count);
571
572	sigalrm = siginfo = sigint = 0;
573
574	/* suck in the data */
575	signal(SIGINFO, sig_handler);
576	while (!sigint) {
577		if (us.size != -1 && us.size - count < B_size)
578			size = us.size - count;
579		else
580			size = B_size;
581		if (siginfo) {
582			stat_end(&xs);
583			siginfo = 0;
584		}
585		if ((size = fread(buf, 1, size, f)) == 0) {
586			if (ferror(f) && errno == EINTR && !sigint)
587				clearerr(f);
588			else
589				break;
590		}
591		stat_update(&xs, count += size);
592		for (ptr = buf; size > 0; ptr += wr, size -= wr)
593			if ((wr = fwrite(ptr, 1, size, of)) < size) {
594				if (ferror(of) && errno == EINTR && !sigint)
595					clearerr(of);
596				else
597					break;
598			}
599		if (size != 0)
600			break;
601	}
602	if (!sigalrm)
603		sigalrm = ferror(f) && errno == ETIMEDOUT;
604	signal(SIGINFO, SIG_DFL);
605
606	stat_end(&xs);
607
608	/*
609	 * If the transfer timed out or was interrupted, we still want to
610	 * set the mtime in case the file is not removed (-r or -R) and
611	 * the user later restarts the transfer.
612	 */
613 signal:
614	/* set mtime of local file */
615	if (!n_flag && us.mtime && !o_stdout && of != NULL &&
616	    (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
617		struct timeval tv[2];
618
619		fflush(of);
620		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
621		tv[1].tv_sec = (long)us.mtime;
622		tv[0].tv_usec = tv[1].tv_usec = 0;
623		if (utimes(tmppath ? tmppath : path, tv))
624			warn("%s: utimes()", tmppath ? tmppath : path);
625	}
626
627	/* timed out or interrupted? */
628	if (sigalrm)
629		warnx("transfer timed out");
630	if (sigint) {
631		warnx("transfer interrupted");
632		goto failure;
633	}
634
635	/* timeout / interrupt before connection completley established? */
636	if (f == NULL)
637		goto failure;
638
639	if (!sigalrm) {
640		/* check the status of our files */
641		if (ferror(f))
642			warn("%s", URL);
643		if (ferror(of))
644			warn("%s", path);
645		if (ferror(f) || ferror(of))
646			goto failure;
647	}
648
649	/* did the transfer complete normally? */
650	if (us.size != -1 && count < us.size) {
651		warnx("%s appears to be truncated: %jd/%jd bytes",
652		    path, (intmax_t)count, (intmax_t)us.size);
653		goto failure_keep;
654	}
655
656	/*
657	 * If the transfer timed out and we didn't know how much to
658	 * expect, assume the worst (i.e. we didn't get all of it)
659	 */
660	if (sigalrm && us.size == -1) {
661		warnx("%s may be truncated", path);
662		goto failure_keep;
663	}
664
665 success:
666	r = 0;
667	if (tmppath != NULL && rename(tmppath, path) == -1) {
668		warn("%s: rename()", path);
669		goto failure_keep;
670	}
671	goto done;
672 failure:
673	if (of && of != stdout && !R_flag && !r_flag)
674		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
675			unlink(tmppath ? tmppath : path);
676	if (R_flag && tmppath != NULL && sb.st_size == -1)
677		rename(tmppath, path); /* ignore errors here */
678 failure_keep:
679	r = -1;
680	goto done;
681 done:
682	if (f)
683		fclose(f);
684	if (of && of != stdout)
685		fclose(of);
686	if (url)
687		fetchFreeURL(url);
688	if (tmppath != NULL)
689		free(tmppath);
690	return r;
691}
692
693static void
694usage(void)
695{
696	fprintf(stderr, "%s\n%s\n%s\n",
697	    "usage: fetch [-146AFMPRUadlmnpqrsv] [-N netrc] [-o outputfile]",
698	    "             [-S bytes] [-B bytes] [-T seconds] [-w seconds]",
699	    "             [-h host -f file [-c dir] | URL ...]");
700}
701
702
703/*
704 * Entry point
705 */
706int
707main(int argc, char *argv[])
708{
709	struct stat sb;
710	struct sigaction sa;
711	const char *p, *s;
712	char *end, *q;
713	int c, e, r;
714
715	while ((c = getopt(argc, argv,
716	    "146AaB:bc:dFf:Hh:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
717		switch (c) {
718		case '1':
719			once_flag = 1;
720			break;
721		case '4':
722			family = PF_INET;
723			break;
724		case '6':
725			family = PF_INET6;
726			break;
727		case 'A':
728			A_flag = 1;
729			break;
730		case 'a':
731			a_flag = 1;
732			break;
733		case 'B':
734			B_size = (off_t)strtol(optarg, &end, 10);
735			if (*optarg == '\0' || *end != '\0')
736				errx(1, "invalid buffer size (%s)", optarg);
737			break;
738		case 'b':
739			warnx("warning: the -b option is deprecated");
740			b_flag = 1;
741			break;
742		case 'c':
743			c_dirname = optarg;
744			break;
745		case 'd':
746			d_flag = 1;
747			break;
748		case 'F':
749			F_flag = 1;
750			break;
751		case 'f':
752			f_filename = optarg;
753			break;
754		case 'H':
755			warnx("the -H option is now implicit, "
756			    "use -U to disable");
757			break;
758		case 'h':
759			h_hostname = optarg;
760			break;
761		case 'l':
762			l_flag = 1;
763			break;
764		case 'o':
765			o_flag = 1;
766			o_filename = optarg;
767			break;
768		case 'M':
769		case 'm':
770			if (r_flag)
771				errx(1, "the -m and -r flags "
772				    "are mutually exclusive");
773			m_flag = 1;
774			break;
775		case 'N':
776			N_filename = optarg;
777			break;
778		case 'n':
779			n_flag = 1;
780			break;
781		case 'P':
782		case 'p':
783			p_flag = 1;
784			break;
785		case 'q':
786			v_level = 0;
787			break;
788		case 'R':
789			R_flag = 1;
790			break;
791		case 'r':
792			if (m_flag)
793				errx(1, "the -m and -r flags "
794				    "are mutually exclusive");
795			r_flag = 1;
796			break;
797		case 'S':
798			S_size = (off_t)strtol(optarg, &end, 10);
799			if (*optarg == '\0' || *end != '\0')
800				errx(1, "invalid size (%s)", optarg);
801			break;
802		case 's':
803			s_flag = 1;
804			break;
805		case 'T':
806			T_secs = strtol(optarg, &end, 10);
807			if (*optarg == '\0' || *end != '\0')
808				errx(1, "invalid timeout (%s)", optarg);
809			break;
810		case 't':
811			t_flag = 1;
812			warnx("warning: the -t option is deprecated");
813			break;
814		case 'U':
815			U_flag = 1;
816			break;
817		case 'v':
818			v_level++;
819			break;
820		case 'w':
821			a_flag = 1;
822			w_secs = strtol(optarg, &end, 10);
823			if (*optarg == '\0' || *end != '\0')
824				errx(1, "invalid delay (%s)", optarg);
825			break;
826		default:
827			usage();
828			exit(EX_USAGE);
829		}
830
831	argc -= optind;
832	argv += optind;
833
834	if (h_hostname || f_filename || c_dirname) {
835		if (!h_hostname || !f_filename || argc) {
836			usage();
837			exit(EX_USAGE);
838		}
839		/* XXX this is a hack. */
840		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
841			errx(1, "invalid hostname");
842		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
843		    c_dirname ? c_dirname : "", f_filename) == -1)
844			errx(1, "%s", strerror(ENOMEM));
845		argc++;
846	}
847
848	if (!argc) {
849		usage();
850		exit(EX_USAGE);
851	}
852
853	/* allocate buffer */
854	if (B_size < MINBUFSIZE)
855		B_size = MINBUFSIZE;
856	if ((buf = malloc(B_size)) == NULL)
857		errx(1, "%s", strerror(ENOMEM));
858
859	/* timeouts */
860	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
861		ftp_timeout = strtol(s, &end, 10);
862		if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
863			warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
864			ftp_timeout = 0;
865		}
866	}
867	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
868		http_timeout = strtol(s, &end, 10);
869		if (*s == '\0' || *end != '\0' || http_timeout < 0) {
870			warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
871			http_timeout = 0;
872		}
873	}
874
875	/* signal handling */
876	sa.sa_flags = 0;
877	sa.sa_handler = sig_handler;
878	sigemptyset(&sa.sa_mask);
879	sigaction(SIGALRM, &sa, NULL);
880	sa.sa_flags = SA_RESETHAND;
881	sigaction(SIGINT, &sa, NULL);
882	fetchRestartCalls = 0;
883
884	/* output file */
885	if (o_flag) {
886		if (strcmp(o_filename, "-") == 0) {
887			o_stdout = 1;
888		} else if (stat(o_filename, &sb) == -1) {
889			if (errno == ENOENT) {
890				if (argc > 1)
891					errx(EX_USAGE, "%s is not a directory",
892					    o_filename);
893			} else {
894				err(EX_IOERR, "%s", o_filename);
895			}
896		} else {
897			if (sb.st_mode & S_IFDIR)
898				o_directory = 1;
899		}
900	}
901
902	/* check if output is to a tty (for progress report) */
903	v_tty = isatty(STDERR_FILENO);
904	if (v_tty)
905		pgrp = getpgrp();
906
907	r = 0;
908
909	/* authentication */
910	if (v_tty)
911		fetchAuthMethod = query_auth;
912	if (N_filename != NULL)
913		setenv("NETRC", N_filename, 1);
914
915	while (argc) {
916		if ((p = strrchr(*argv, '/')) == NULL)
917			p = *argv;
918		else
919			p++;
920
921		if (!*p)
922			p = "fetch.out";
923
924		fetchLastErrCode = 0;
925
926		if (o_flag) {
927			if (o_stdout) {
928				e = fetch(*argv, "-");
929			} else if (o_directory) {
930				asprintf(&q, "%s/%s", o_filename, p);
931				e = fetch(*argv, q);
932				free(q);
933			} else {
934				e = fetch(*argv, o_filename);
935			}
936		} else {
937			e = fetch(*argv, p);
938		}
939
940		if (sigint)
941			kill(getpid(), SIGINT);
942
943		if (e == 0 && once_flag)
944			exit(0);
945
946		if (e) {
947			r = 1;
948			if ((fetchLastErrCode
949			    && fetchLastErrCode != FETCH_UNAVAIL
950			    && fetchLastErrCode != FETCH_MOVED
951			    && fetchLastErrCode != FETCH_URL
952			    && fetchLastErrCode != FETCH_RESOLV
953			    && fetchLastErrCode != FETCH_UNKNOWN)) {
954				if (w_secs && v_level)
955					fprintf(stderr, "Waiting %ld seconds "
956					    "before retrying\n", w_secs);
957				if (w_secs)
958					sleep(w_secs);
959				if (a_flag)
960					continue;
961			}
962		}
963
964		argc--, argv++;
965	}
966
967	exit(r);
968}
969