fetch.c revision 125976 
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 125976 2004-02-18 21:37:36Z 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(size_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, "%4ju %cB", (uintmax_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((size_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			goto failure;
447		} else if (us.size != S_size) {
448			warnx("%s: size mismatch: expected %jd, actual %jd",
449			    URL, (intmax_t)S_size, (intmax_t)us.size);
450			goto failure;
451		}
452	}
453
454	/* symlink instead of copy */
455	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
456		if (symlink(url->doc, path) == -1) {
457			warn("%s: symlink()", path);
458			goto failure;
459		}
460		goto success;
461	}
462
463	if (us.size == -1 && !o_stdout && v_level > 0)
464		warnx("%s: size of remote file is not known", URL);
465	if (v_level > 1) {
466		if (sb.st_size != -1)
467			fprintf(stderr, "local size / mtime: %jd / %ld\n",
468			    (intmax_t)sb.st_size, (long)sb.st_mtime);
469		if (us.size != -1)
470			fprintf(stderr, "remote size / mtime: %jd / %ld\n",
471			    (intmax_t)us.size, (long)us.mtime);
472	}
473
474	/* open output file */
475	if (o_stdout) {
476		/* output to stdout */
477		of = stdout;
478	} else if (r_flag && sb.st_size != -1) {
479		/* resume mode, local file exists */
480		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
481			/* no match! have to refetch */
482			fclose(f);
483			/* if precious, warn the user and give up */
484			if (R_flag) {
485				warnx("%s: local modification time "
486				    "does not match remote", path);
487				goto failure_keep;
488			}
489		} else {
490			if (us.size == sb.st_size)
491				/* nothing to do */
492				goto success;
493			if (sb.st_size > us.size) {
494				/* local file too long! */
495				warnx("%s: local file (%jd bytes) is longer "
496				    "than remote file (%jd bytes)", path,
497				    (intmax_t)sb.st_size, (intmax_t)us.size);
498				goto failure;
499			}
500			/* we got it, open local file */
501			if ((of = fopen(path, "a")) == NULL) {
502				warn("%s: fopen()", path);
503				goto failure;
504			}
505			/* check that it didn't move under our feet */
506			if (fstat(fileno(of), &nsb) == -1) {
507				/* can't happen! */
508				warn("%s: fstat()", path);
509				goto failure;
510			}
511			if (nsb.st_dev != sb.st_dev ||
512			    nsb.st_ino != nsb.st_ino ||
513			    nsb.st_size != sb.st_size) {
514				warnx("%s: file has changed", URL);
515				fclose(of);
516				of = NULL;
517				sb = nsb;
518			}
519		}
520	} else if (m_flag && sb.st_size != -1) {
521		/* mirror mode, local file exists */
522		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
523			goto success;
524	}
525
526	if (of == NULL) {
527		/*
528		 * We don't yet have an output file; either this is a
529		 * vanilla run with no special flags, or the local and
530		 * remote files didn't match.
531		 */
532
533		if (url->offset > 0) {
534			/*
535			 * We tried to restart a transfer, but for
536			 * some reason gave up - so we have to restart
537			 * from scratch if we want the whole file
538			 */
539			url->offset = 0;
540			if ((f = fetchXGet(url, &us, flags)) == NULL) {
541				warnx("%s: %s", URL, fetchLastErrString);
542				goto failure;
543			}
544			if (sigint)
545				goto signal;
546		}
547
548		/* construct a temp file name */
549		if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
550			if ((slash = strrchr(path, '/')) == NULL)
551				slash = path;
552			else
553				++slash;
554			asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
555			    (int)(slash - path), path, slash);
556			if (tmppath != NULL) {
557				mkstemps(tmppath, strlen(slash) + 1);
558				of = fopen(tmppath, "w");
559			}
560		}
561		if (of == NULL)
562			of = fopen(path, "w");
563		if (of == NULL) {
564			warn("%s: open()", path);
565			goto failure;
566		}
567	}
568	count = url->offset;
569
570	/* start the counter */
571	stat_start(&xs, path, us.size, count);
572
573	sigalrm = siginfo = sigint = 0;
574
575	/* suck in the data */
576	signal(SIGINFO, sig_handler);
577	while (!sigint) {
578		if (us.size != -1 && us.size - count < B_size)
579			size = us.size - count;
580		else
581			size = B_size;
582		if (siginfo) {
583			stat_end(&xs);
584			siginfo = 0;
585		}
586		if ((size = fread(buf, 1, size, f)) == 0) {
587			if (ferror(f) && errno == EINTR && !sigint)
588				clearerr(f);
589			else
590				break;
591		}
592		stat_update(&xs, count += size);
593		for (ptr = buf; size > 0; ptr += wr, size -= wr)
594			if ((wr = fwrite(ptr, 1, size, of)) < size) {
595				if (ferror(of) && errno == EINTR && !sigint)
596					clearerr(of);
597				else
598					break;
599			}
600		if (size != 0)
601			break;
602	}
603	if (!sigalrm)
604		sigalrm = ferror(f) && errno == ETIMEDOUT;
605	signal(SIGINFO, SIG_DFL);
606
607	stat_end(&xs);
608
609	/*
610	 * If the transfer timed out or was interrupted, we still want to
611	 * set the mtime in case the file is not removed (-r or -R) and
612	 * the user later restarts the transfer.
613	 */
614 signal:
615	/* set mtime of local file */
616	if (!n_flag && us.mtime && !o_stdout && of != NULL &&
617	    (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
618		struct timeval tv[2];
619
620		fflush(of);
621		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
622		tv[1].tv_sec = (long)us.mtime;
623		tv[0].tv_usec = tv[1].tv_usec = 0;
624		if (utimes(tmppath ? tmppath : path, tv))
625			warn("%s: utimes()", tmppath ? tmppath : path);
626	}
627
628	/* timed out or interrupted? */
629	if (sigalrm)
630		warnx("transfer timed out");
631	if (sigint) {
632		warnx("transfer interrupted");
633		goto failure;
634	}
635
636	/* timeout / interrupt before connection completley established? */
637	if (f == NULL)
638		goto failure;
639
640	if (!sigalrm) {
641		/* check the status of our files */
642		if (ferror(f))
643			warn("%s", URL);
644		if (ferror(of))
645			warn("%s", path);
646		if (ferror(f) || ferror(of))
647			goto failure;
648	}
649
650	/* did the transfer complete normally? */
651	if (us.size != -1 && count < us.size) {
652		warnx("%s appears to be truncated: %jd/%jd bytes",
653		    path, (intmax_t)count, (intmax_t)us.size);
654		goto failure_keep;
655	}
656
657	/*
658	 * If the transfer timed out and we didn't know how much to
659	 * expect, assume the worst (i.e. we didn't get all of it)
660	 */
661	if (sigalrm && us.size == -1) {
662		warnx("%s may be truncated", path);
663		goto failure_keep;
664	}
665
666 success:
667	r = 0;
668	if (tmppath != NULL && rename(tmppath, path) == -1) {
669		warn("%s: rename()", path);
670		goto failure_keep;
671	}
672	goto done;
673 failure:
674	if (of && of != stdout && !R_flag && !r_flag)
675		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
676			unlink(tmppath ? tmppath : path);
677	if (R_flag && tmppath != NULL && sb.st_size == -1)
678		rename(tmppath, path); /* ignore errors here */
679 failure_keep:
680	r = -1;
681	goto done;
682 done:
683	if (f)
684		fclose(f);
685	if (of && of != stdout)
686		fclose(of);
687	if (url)
688		fetchFreeURL(url);
689	if (tmppath != NULL)
690		free(tmppath);
691	return r;
692}
693
694static void
695usage(void)
696{
697	fprintf(stderr, "%s\n%s\n%s\n",
698	    "usage: fetch [-146AFMPRUadlmnpqrsv] [-N netrc] [-o outputfile]",
699	    "             [-S bytes] [-B bytes] [-T seconds] [-w seconds]",
700	    "             [-h host -f file [-c dir] | URL ...]");
701}
702
703
704/*
705 * Entry point
706 */
707int
708main(int argc, char *argv[])
709{
710	struct stat sb;
711	struct sigaction sa;
712	const char *p, *s;
713	char *end, *q;
714	int c, e, r;
715
716	while ((c = getopt(argc, argv,
717	    "146AaB:bc:dFf:Hh:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
718		switch (c) {
719		case '1':
720			once_flag = 1;
721			break;
722		case '4':
723			family = PF_INET;
724			break;
725		case '6':
726			family = PF_INET6;
727			break;
728		case 'A':
729			A_flag = 1;
730			break;
731		case 'a':
732			a_flag = 1;
733			break;
734		case 'B':
735			B_size = (off_t)strtol(optarg, &end, 10);
736			if (*optarg == '\0' || *end != '\0')
737				errx(1, "invalid buffer size (%s)", optarg);
738			break;
739		case 'b':
740			warnx("warning: the -b option is deprecated");
741			b_flag = 1;
742			break;
743		case 'c':
744			c_dirname = optarg;
745			break;
746		case 'd':
747			d_flag = 1;
748			break;
749		case 'F':
750			F_flag = 1;
751			break;
752		case 'f':
753			f_filename = optarg;
754			break;
755		case 'H':
756			warnx("the -H option is now implicit, "
757			    "use -U to disable");
758			break;
759		case 'h':
760			h_hostname = optarg;
761			break;
762		case 'l':
763			l_flag = 1;
764			break;
765		case 'o':
766			o_flag = 1;
767			o_filename = optarg;
768			break;
769		case 'M':
770		case 'm':
771			if (r_flag)
772				errx(1, "the -m and -r flags "
773				    "are mutually exclusive");
774			m_flag = 1;
775			break;
776		case 'N':
777			N_filename = optarg;
778			break;
779		case 'n':
780			n_flag = 1;
781			break;
782		case 'P':
783		case 'p':
784			p_flag = 1;
785			break;
786		case 'q':
787			v_level = 0;
788			break;
789		case 'R':
790			R_flag = 1;
791			break;
792		case 'r':
793			if (m_flag)
794				errx(1, "the -m and -r flags "
795				    "are mutually exclusive");
796			r_flag = 1;
797			break;
798		case 'S':
799			S_size = (off_t)strtol(optarg, &end, 10);
800			if (*optarg == '\0' || *end != '\0')
801				errx(1, "invalid size (%s)", optarg);
802			break;
803		case 's':
804			s_flag = 1;
805			break;
806		case 'T':
807			T_secs = strtol(optarg, &end, 10);
808			if (*optarg == '\0' || *end != '\0')
809				errx(1, "invalid timeout (%s)", optarg);
810			break;
811		case 't':
812			t_flag = 1;
813			warnx("warning: the -t option is deprecated");
814			break;
815		case 'U':
816			U_flag = 1;
817			break;
818		case 'v':
819			v_level++;
820			break;
821		case 'w':
822			a_flag = 1;
823			w_secs = strtol(optarg, &end, 10);
824			if (*optarg == '\0' || *end != '\0')
825				errx(1, "invalid delay (%s)", optarg);
826			break;
827		default:
828			usage();
829			exit(EX_USAGE);
830		}
831
832	argc -= optind;
833	argv += optind;
834
835	if (h_hostname || f_filename || c_dirname) {
836		if (!h_hostname || !f_filename || argc) {
837			usage();
838			exit(EX_USAGE);
839		}
840		/* XXX this is a hack. */
841		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
842			errx(1, "invalid hostname");
843		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
844		    c_dirname ? c_dirname : "", f_filename) == -1)
845			errx(1, "%s", strerror(ENOMEM));
846		argc++;
847	}
848
849	if (!argc) {
850		usage();
851		exit(EX_USAGE);
852	}
853
854	/* allocate buffer */
855	if (B_size < MINBUFSIZE)
856		B_size = MINBUFSIZE;
857	if ((buf = malloc(B_size)) == NULL)
858		errx(1, "%s", strerror(ENOMEM));
859
860	/* timeouts */
861	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
862		ftp_timeout = strtol(s, &end, 10);
863		if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
864			warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
865			ftp_timeout = 0;
866		}
867	}
868	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
869		http_timeout = strtol(s, &end, 10);
870		if (*s == '\0' || *end != '\0' || http_timeout < 0) {
871			warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
872			http_timeout = 0;
873		}
874	}
875
876	/* signal handling */
877	sa.sa_flags = 0;
878	sa.sa_handler = sig_handler;
879	sigemptyset(&sa.sa_mask);
880	sigaction(SIGALRM, &sa, NULL);
881	sa.sa_flags = SA_RESETHAND;
882	sigaction(SIGINT, &sa, NULL);
883	fetchRestartCalls = 0;
884
885	/* output file */
886	if (o_flag) {
887		if (strcmp(o_filename, "-") == 0) {
888			o_stdout = 1;
889		} else if (stat(o_filename, &sb) == -1) {
890			if (errno == ENOENT) {
891				if (argc > 1)
892					errx(EX_USAGE, "%s is not a directory",
893					    o_filename);
894			} else {
895				err(EX_IOERR, "%s", o_filename);
896			}
897		} else {
898			if (sb.st_mode & S_IFDIR)
899				o_directory = 1;
900		}
901	}
902
903	/* check if output is to a tty (for progress report) */
904	v_tty = isatty(STDERR_FILENO);
905	if (v_tty)
906		pgrp = getpgrp();
907
908	r = 0;
909
910	/* authentication */
911	if (v_tty)
912		fetchAuthMethod = query_auth;
913	if (N_filename != NULL)
914		setenv("NETRC", N_filename, 1);
915
916	while (argc) {
917		if ((p = strrchr(*argv, '/')) == NULL)
918			p = *argv;
919		else
920			p++;
921
922		if (!*p)
923			p = "fetch.out";
924
925		fetchLastErrCode = 0;
926
927		if (o_flag) {
928			if (o_stdout) {
929				e = fetch(*argv, "-");
930			} else if (o_directory) {
931				asprintf(&q, "%s/%s", o_filename, p);
932				e = fetch(*argv, q);
933				free(q);
934			} else {
935				e = fetch(*argv, o_filename);
936			}
937		} else {
938			e = fetch(*argv, p);
939		}
940
941		if (sigint)
942			kill(getpid(), SIGINT);
943
944		if (e == 0 && once_flag)
945			exit(0);
946
947		if (e) {
948			r = 1;
949			if ((fetchLastErrCode
950			    && fetchLastErrCode != FETCH_UNAVAIL
951			    && fetchLastErrCode != FETCH_MOVED
952			    && fetchLastErrCode != FETCH_URL
953			    && fetchLastErrCode != FETCH_RESOLV
954			    && fetchLastErrCode != FETCH_UNKNOWN)) {
955				if (w_secs && v_level)
956					fprintf(stderr, "Waiting %ld seconds "
957					    "before retrying\n", w_secs);
958				if (w_secs)
959					sleep(w_secs);
960				if (a_flag)
961					continue;
962			}
963		}
964
965		argc--, argv++;
966	}
967
968	exit(r);
969}
970