fetch.c revision 106051 
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 106051 2002-10-27 17:33:08Z 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 <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <sysexits.h>
45#include <termios.h>
46#include <unistd.h>
47
48#include <fetch.h>
49
50#define MINBUFSIZE	4096
51
52/* Option flags */
53int	 A_flag;	/*    -A: do not follow 302 redirects */
54int	 a_flag;	/*    -a: auto retry */
55off_t	 B_size;	/*    -B: buffer size */
56int	 b_flag;	/*!   -b: workaround TCP bug */
57char    *c_dirname;	/*    -c: remote directory */
58int	 d_flag;	/*    -d: direct connection */
59int	 F_flag;	/*    -F: restart without checking mtime  */
60char	*f_filename;	/*    -f: file to fetch */
61char	*h_hostname;	/*    -h: host to fetch from */
62int	 l_flag;	/*    -l: link rather than copy file: URLs */
63int	 m_flag;	/* -[Mm]: mirror mode */
64int	 n_flag;	/*    -n: do not preserve modification time */
65int	 o_flag;	/*    -o: specify output file */
66int	 o_directory;	/*        output file is a directory */
67char	*o_filename;	/*        name of output file */
68int	 o_stdout;	/*        output file is stdout */
69int	 once_flag;	/*    -1: stop at first successful file */
70int	 p_flag;	/* -[Pp]: use passive FTP */
71int	 R_flag;	/*    -R: don't delete partially transferred files */
72int	 r_flag;	/*    -r: restart previously interrupted transfer */
73off_t	 S_size;        /*    -S: require size to match */
74int	 s_flag;        /*    -s: show size, don't fetch */
75long	 T_secs = 120;	/*    -T: transfer timeout in seconds */
76int	 t_flag;	/*!   -t: workaround TCP bug */
77int	 U_flag;	/*    -U: do not use high ports */
78int	 v_level = 1;	/*    -v: verbosity level */
79int	 v_tty;		/*        stdout is a tty */
80pid_t	 pgrp;		/*        our process group */
81long	 w_secs;	/*    -w: retry delay */
82int	 family = PF_UNSPEC;	/* -[46]: address family to use */
83
84int	 sigalrm;	/* SIGALRM received */
85int	 siginfo;	/* SIGINFO received */
86int	 sigint;	/* SIGINT received */
87
88long	 ftp_timeout;	/* default timeout for FTP transfers */
89long	 http_timeout;	/* default timeout for HTTP transfers */
90u_char	*buf;		/* transfer buffer */
91
92
93/*
94 * Signal handler
95 */
96static void
97sig_handler(int sig)
98{
99	switch (sig) {
100	case SIGALRM:
101		sigalrm = 1;
102		break;
103	case SIGINFO:
104		siginfo = 1;
105		break;
106	case SIGINT:
107		sigint = 1;
108		break;
109	}
110}
111
112struct xferstat {
113	char		 name[40];
114	struct timeval	 start;
115	struct timeval	 end;
116	struct timeval	 last;
117	off_t		 size;
118	off_t		 offset;
119	off_t		 rcvd;
120};
121
122/*
123 * Update the stats display
124 */
125static void
126stat_display(struct xferstat *xs, int force)
127{
128	struct timeval now;
129	int ctty_pgrp;
130
131	if (!v_tty || !v_level)
132		return;
133
134	/* check if we're the foreground process */
135	if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
136	    (pid_t)ctty_pgrp != pgrp)
137		return;
138
139	gettimeofday(&now, NULL);
140	if (!force && now.tv_sec <= xs->last.tv_sec)
141		return;
142	xs->last = now;
143
144	fprintf(stderr, "\rReceiving %s", xs->name);
145	if (xs->size <= 0) {
146		fprintf(stderr, ": %lld bytes", (long long)xs->rcvd);
147	} else {
148		long elapsed;
149
150		fprintf(stderr, " (%lld bytes): %d%%", (long long)xs->size,
151		    (int)((100.0 * xs->rcvd) / xs->size));
152		elapsed = xs->last.tv_sec - xs->start.tv_sec;
153		if (elapsed > 30) {
154			long remaining;
155
156			remaining = ((xs->size * elapsed) / xs->rcvd) - elapsed;
157			fprintf(stderr, " (ETA ");
158			if (remaining > 3600) {
159				fprintf(stderr, "%02ld:", remaining / 3600);
160				remaining %= 3600;
161			}
162			fprintf(stderr, "%02ld:%02ld)  ",
163			    remaining / 60, remaining % 60);
164		}
165	}
166}
167
168/*
169 * Initialize the transfer statistics
170 */
171static void
172stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
173{
174	snprintf(xs->name, sizeof xs->name, "%s", name);
175	gettimeofday(&xs->start, NULL);
176	xs->last.tv_sec = xs->last.tv_usec = 0;
177	xs->end = xs->last;
178	xs->size = size;
179	xs->offset = offset;
180	xs->rcvd = offset;
181	stat_display(xs, 1);
182}
183
184/*
185 * Update the transfer statistics
186 */
187static void
188stat_update(struct xferstat *xs, off_t rcvd)
189{
190	xs->rcvd = rcvd;
191	stat_display(xs, 0);
192}
193
194/*
195 * Finalize the transfer statistics
196 */
197static void
198stat_end(struct xferstat *xs)
199{
200	double delta;
201	double bps;
202
203	if (!v_level)
204		return;
205
206	gettimeofday(&xs->end, NULL);
207
208	stat_display(xs, 1);
209	fputc('\n', stderr);
210	delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
211	    - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
212	fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
213	    (long long)(xs->rcvd - xs->offset), delta);
214	bps = (xs->rcvd - xs->offset) / delta;
215	if (bps > 1024*1024)
216		fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
217	else if (bps > 1024)
218		fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
219	else
220		fprintf(stderr, "(%.2f Bps)\n", bps);
221}
222
223/*
224 * Ask the user for authentication details
225 */
226static int
227query_auth(struct url *URL)
228{
229	struct termios tios;
230	tcflag_t saved_flags;
231	int i, nopwd;
232
233
234	fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
235	    URL->scheme, URL->host, URL->port);
236
237	fprintf(stderr, "Login: ");
238	if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
239		return -1;
240	for (i = 0; URL->user[i]; ++i)
241		if (isspace(URL->user[i]))
242			URL->user[i] = '\0';
243
244	fprintf(stderr, "Password: ");
245	if (tcgetattr(STDIN_FILENO, &tios) == 0) {
246		saved_flags = tios.c_lflag;
247		tios.c_lflag &= ~ECHO;
248		tios.c_lflag |= ECHONL|ICANON;
249		tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
250		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
251		tios.c_lflag = saved_flags;
252		tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
253	} else {
254		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
255	}
256	if (nopwd)
257		return -1;
258
259	for (i = 0; URL->pwd[i]; ++i)
260		if (isspace(URL->pwd[i]))
261			URL->pwd[i] = '\0';
262	return 0;
263}
264
265/*
266 * Fetch a file
267 */
268static int
269fetch(char *URL, const char *path)
270{
271	struct url *url;
272	struct url_stat us;
273	struct stat sb, nsb;
274	struct xferstat xs;
275	FILE *f, *of;
276	size_t size, wr;
277	off_t count;
278	char flags[8];
279	const char *slash;
280	char *tmppath;
281	int r;
282	u_int timeout;
283	u_char *ptr;
284
285	f = of = NULL;
286	tmppath = NULL;
287
288	/* parse URL */
289	if ((url = fetchParseURL(URL)) == NULL) {
290		warnx("%s: parse error", URL);
291		goto failure;
292	}
293
294	/* if no scheme was specified, take a guess */
295	if (!*url->scheme) {
296		if (!*url->host)
297			strcpy(url->scheme, SCHEME_FILE);
298		else if (strncasecmp(url->host, "ftp.", 4) == 0)
299			strcpy(url->scheme, SCHEME_FTP);
300		else if (strncasecmp(url->host, "www.", 4) == 0)
301			strcpy(url->scheme, SCHEME_HTTP);
302	}
303
304	timeout = 0;
305	*flags = 0;
306	count = 0;
307
308	/* common flags */
309	if (v_level > 1)
310		strcat(flags, "v");
311	if (v_level > 2)
312		fetchDebug = 1;
313	switch (family) {
314	case PF_INET:
315		strcat(flags, "4");
316		break;
317	case PF_INET6:
318		strcat(flags, "6");
319		break;
320	}
321
322	/* FTP specific flags */
323	if (strcmp(url->scheme, "ftp") == 0) {
324		if (p_flag)
325			strcat(flags, "p");
326		if (d_flag)
327			strcat(flags, "d");
328		if (U_flag)
329			strcat(flags, "l");
330		timeout = T_secs ? T_secs : ftp_timeout;
331	}
332
333	/* HTTP specific flags */
334	if (strcmp(url->scheme, "http") == 0) {
335		if (d_flag)
336			strcat(flags, "d");
337		if (A_flag)
338			strcat(flags, "A");
339		timeout = T_secs ? T_secs : http_timeout;
340	}
341
342	/* set the protocol timeout. */
343	fetchTimeout = timeout;
344
345	/* just print size */
346	if (s_flag) {
347		if (timeout)
348			alarm(timeout);
349		r = fetchStat(url, &us, flags);
350		if (timeout)
351			alarm(0);
352		if (sigalrm || sigint)
353			goto signal;
354		if (r == -1) {
355			warnx("%s", fetchLastErrString);
356			goto failure;
357		}
358		if (us.size == -1)
359			printf("Unknown\n");
360		else
361			printf("%lld\n", (long long)us.size);
362		goto success;
363	}
364
365	/*
366	 * If the -r flag was specified, we have to compare the local
367	 * and remote files, so we should really do a fetchStat()
368	 * first, but I know of at least one HTTP server that only
369	 * sends the content size in response to GET requests, and
370	 * leaves it out of replies to HEAD requests.  Also, in the
371	 * (frequent) case that the local and remote files match but
372	 * the local file is truncated, we have sufficient information
373	 * before the compare to issue a correct request.  Therefore,
374	 * we always issue a GET request as if we were sure the local
375	 * file was a truncated copy of the remote file; we can drop
376	 * the connection later if we change our minds.
377	 */
378	sb.st_size = -1;
379	if (!o_stdout && stat(path, &sb) == -1 && errno != ENOENT) {
380		warnx("%s: stat()", path);
381		goto failure;
382	}
383	if (!o_stdout && r_flag && S_ISREG(sb.st_mode))
384		url->offset = sb.st_size;
385
386	/* start the transfer */
387	if (timeout)
388		alarm(timeout);
389	f = fetchXGet(url, &us, flags);
390	if (timeout)
391		alarm(0);
392	if (sigalrm || sigint)
393		goto signal;
394	if (f == NULL) {
395		warnx("%s: %s", path, fetchLastErrString);
396		goto failure;
397	}
398	if (sigint)
399		goto signal;
400
401	/* check that size is as expected */
402	if (S_size) {
403		if (us.size == -1) {
404			warnx("%s: size unknown", path);
405			goto failure;
406		} else if (us.size != S_size) {
407			warnx("%s: size mismatch: expected %lld, actual %lld",
408			    path, (long long)S_size, (long long)us.size);
409			goto failure;
410		}
411	}
412
413	/* symlink instead of copy */
414	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
415		if (symlink(url->doc, path) == -1) {
416			warn("%s: symlink()", path);
417			goto failure;
418		}
419		goto success;
420	}
421
422	if (us.size == -1 && !o_stdout && v_level > 0)
423		warnx("%s: size of remote file is not known", path);
424	if (v_level > 1) {
425		if (sb.st_size != -1)
426			fprintf(stderr, "local size / mtime: %lld / %ld\n",
427			    (long long)sb.st_size, (long)sb.st_mtime);
428		if (us.size != -1)
429			fprintf(stderr, "remote size / mtime: %lld / %ld\n",
430			    (long long)us.size, (long)us.mtime);
431	}
432
433	/* open output file */
434	if (o_stdout) {
435		/* output to stdout */
436		of = stdout;
437	} else if (r_flag && sb.st_size != -1) {
438		/* resume mode, local file exists */
439		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
440			/* no match! have to refetch */
441			fclose(f);
442			/* if precious, warn the user and give up */
443			if (R_flag) {
444				warnx("%s: local modification time "
445				    "does not match remote", path);
446				goto failure_keep;
447			}
448		} else {
449			if (us.size == sb.st_size)
450				/* nothing to do */
451				goto success;
452			if (sb.st_size > us.size) {
453				/* local file too long! */
454				warnx("%s: local file (%lld bytes) is longer "
455				    "than remote file (%lld bytes)", path,
456				    (long long)sb.st_size, (long long)us.size);
457				goto failure;
458			}
459			/* we got it, open local file */
460			if ((of = fopen(path, "a")) == NULL) {
461				warn("%s: fopen()", path);
462				goto failure;
463			}
464			/* check that it didn't move under our feet */
465			if (fstat(fileno(of), &nsb) == -1) {
466				/* can't happen! */
467				warn("%s: fstat()", path);
468				goto failure;
469			}
470			if (nsb.st_dev != sb.st_dev ||
471			    nsb.st_ino != nsb.st_ino ||
472			    nsb.st_size != sb.st_size) {
473				warnx("%s: file has changed", path);
474				fclose(of);
475				of = NULL;
476				sb = nsb;
477			}
478		}
479	} else if (m_flag && sb.st_size != -1) {
480		/* mirror mode, local file exists */
481		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
482			goto success;
483	}
484
485	if (of == NULL) {
486		/*
487		 * We don't yet have an output file; either this is a
488		 * vanilla run with no special flags, or the local and
489		 * remote files didn't match.
490		 */
491
492		if (url->offset != 0) {
493			/*
494			 * We tried to restart a transfer, but for
495			 * some reason gave up - so we have to restart
496			 * from scratch if we want the whole file
497			 */
498			url->offset = 0;
499			if ((f = fetchXGet(url, &us, flags)) == NULL) {
500				warnx("%s: %s", path, fetchLastErrString);
501				goto failure;
502			}
503			if (sigint)
504				goto signal;
505		}
506
507		/* construct a temp file name */
508		if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
509			if ((slash = strrchr(path, '/')) == NULL)
510				slash = path;
511			else
512				++slash;
513			asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
514			    (int)(slash - path), path, slash);
515			if (tmppath != NULL) {
516				mkstemps(tmppath, strlen(slash) + 1);
517				of = fopen(tmppath, "w");
518			}
519		}
520		if (of == NULL)
521			of = fopen(path, "w");
522		if (of == NULL) {
523			warn("%s: open()", path);
524			goto failure;
525		}
526	}
527	count = url->offset;
528
529	/* start the counter */
530	stat_start(&xs, path, us.size, count);
531
532	sigalrm = siginfo = sigint = 0;
533
534	/* suck in the data */
535	signal(SIGINFO, sig_handler);
536	while (!sigint) {
537		if (us.size != -1 && us.size - count < B_size)
538			size = us.size - count;
539		else
540			size = B_size;
541		if (siginfo) {
542			stat_end(&xs);
543			siginfo = 0;
544		}
545		if ((size = fread(buf, 1, size, f)) == 0) {
546			if (ferror(f) && errno == EINTR && !sigint)
547				clearerr(f);
548			else
549				break;
550		}
551		stat_update(&xs, count += size);
552		for (ptr = buf; size > 0; ptr += wr, size -= wr)
553			if ((wr = fwrite(ptr, 1, size, of)) < size) {
554				if (ferror(of) && errno == EINTR && !sigint)
555					clearerr(of);
556				else
557					break;
558			}
559		if (size != 0)
560			break;
561	}
562	if (!sigalrm)
563		sigalrm = ferror(f) && errno == ETIMEDOUT;
564	signal(SIGINFO, SIG_DFL);
565
566	stat_end(&xs);
567
568	/*
569	 * If the transfer timed out or was interrupted, we still want to
570	 * set the mtime in case the file is not removed (-r or -R) and
571	 * the user later restarts the transfer.
572	 */
573 signal:
574	/* set mtime of local file */
575	if (!n_flag && us.mtime && !o_stdout
576	    && (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
577		struct timeval tv[2];
578
579		fflush(of);
580		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
581		tv[1].tv_sec = (long)us.mtime;
582		tv[0].tv_usec = tv[1].tv_usec = 0;
583		if (utimes(tmppath ? tmppath : path, tv))
584			warn("%s: utimes()", tmppath ? tmppath : path);
585	}
586
587	/* timed out or interrupted? */
588	if (sigalrm)
589		warnx("transfer timed out");
590	if (sigint) {
591		warnx("transfer interrupted");
592		goto failure;
593	}
594
595	if (!sigalrm) {
596		/* check the status of our files */
597		if (ferror(f))
598			warn("%s", URL);
599		if (ferror(of))
600			warn("%s", path);
601		if (ferror(f) || ferror(of))
602			goto failure;
603	}
604
605	/* did the transfer complete normally? */
606	if (us.size != -1 && count < us.size) {
607		warnx("%s appears to be truncated: %lld/%lld bytes",
608		    path, (long long)count, (long long)us.size);
609		goto failure_keep;
610	}
611
612	/*
613	 * If the transfer timed out and we didn't know how much to
614	 * expect, assume the worst (i.e. we didn't get all of it)
615	 */
616	if (sigalrm && us.size == -1) {
617		warnx("%s may be truncated", path);
618		goto failure_keep;
619	}
620
621 success:
622	r = 0;
623	if (tmppath != NULL && rename(tmppath, path) == -1) {
624		warn("%s: rename()", path);
625		goto failure_keep;
626	}
627	goto done;
628 failure:
629	if (of && of != stdout && !R_flag && !r_flag)
630		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
631			unlink(tmppath ? tmppath : path);
632	if (R_flag && tmppath != NULL && sb.st_size == -1)
633		rename(tmppath, path); /* ignore errors here */
634 failure_keep:
635	r = -1;
636	goto done;
637 done:
638	if (f)
639		fclose(f);
640	if (of && of != stdout)
641		fclose(of);
642	if (url)
643		fetchFreeURL(url);
644	if (tmppath != NULL)
645		free(tmppath);
646	return r;
647}
648
649static void
650usage(void)
651{
652	fprintf(stderr, "%s\n%s\n%s\n",
653	    "usage: fetch [-146AFMPRUadlmnpqrsv] [-o outputfile] [-S bytes]",
654	    "             [-B bytes] [-T seconds] [-w seconds]",
655	    "             [-h host -f file [-c dir] | URL ...]");
656}
657
658
659/*
660 * Entry point
661 */
662int
663main(int argc, char *argv[])
664{
665	struct stat sb;
666	struct sigaction sa;
667	const char *p, *s;
668	char *end, *q;
669	int c, e, r;
670
671	while ((c = getopt(argc, argv,
672	    "146AaB:bc:dFf:Hh:lMmnPpo:qRrS:sT:tUvw:")) != -1)
673		switch (c) {
674		case '1':
675			once_flag = 1;
676			break;
677		case '4':
678			family = PF_INET;
679			break;
680		case '6':
681			family = PF_INET6;
682			break;
683		case 'A':
684			A_flag = 1;
685			break;
686		case 'a':
687			a_flag = 1;
688			break;
689		case 'B':
690			B_size = (off_t)strtol(optarg, &end, 10);
691			if (*optarg == '\0' || *end != '\0')
692				errx(1, "invalid buffer size (%s)", optarg);
693			break;
694		case 'b':
695			warnx("warning: the -b option is deprecated");
696			b_flag = 1;
697			break;
698		case 'c':
699			c_dirname = optarg;
700			break;
701		case 'd':
702			d_flag = 1;
703			break;
704		case 'F':
705			F_flag = 1;
706			break;
707		case 'f':
708			f_filename = optarg;
709			break;
710		case 'H':
711			warnx("the -H option is now implicit, "
712			    "use -U to disable");
713			break;
714		case 'h':
715			h_hostname = optarg;
716			break;
717		case 'l':
718			l_flag = 1;
719			break;
720		case 'o':
721			o_flag = 1;
722			o_filename = optarg;
723			break;
724		case 'M':
725		case 'm':
726			if (r_flag)
727				errx(1, "the -m and -r flags "
728				    "are mutually exclusive");
729			m_flag = 1;
730			break;
731		case 'n':
732			n_flag = 1;
733			break;
734		case 'P':
735		case 'p':
736			p_flag = 1;
737			break;
738		case 'q':
739			v_level = 0;
740			break;
741		case 'R':
742			R_flag = 1;
743			break;
744		case 'r':
745			if (m_flag)
746				errx(1, "the -m and -r flags "
747				    "are mutually exclusive");
748			r_flag = 1;
749			break;
750		case 'S':
751			S_size = (off_t)strtol(optarg, &end, 10);
752			if (*optarg == '\0' || *end != '\0')
753				errx(1, "invalid size (%s)", optarg);
754			break;
755		case 's':
756			s_flag = 1;
757			break;
758		case 'T':
759			T_secs = strtol(optarg, &end, 10);
760			if (*optarg == '\0' || *end != '\0')
761				errx(1, "invalid timeout (%s)", optarg);
762			break;
763		case 't':
764			t_flag = 1;
765			warnx("warning: the -t option is deprecated");
766			break;
767		case 'U':
768			U_flag = 1;
769			break;
770		case 'v':
771			v_level++;
772			break;
773		case 'w':
774			a_flag = 1;
775			w_secs = strtol(optarg, &end, 10);
776			if (*optarg == '\0' || *end != '\0')
777				errx(1, "invalid delay (%s)", optarg);
778			break;
779		default:
780			usage();
781			exit(EX_USAGE);
782		}
783
784	argc -= optind;
785	argv += optind;
786
787	if (h_hostname || f_filename || c_dirname) {
788		if (!h_hostname || !f_filename || argc) {
789			usage();
790			exit(EX_USAGE);
791		}
792		/* XXX this is a hack. */
793		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
794			errx(1, "invalid hostname");
795		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
796		    c_dirname ? c_dirname : "", f_filename) == -1)
797			errx(1, "%s", strerror(ENOMEM));
798		argc++;
799	}
800
801	if (!argc) {
802		usage();
803		exit(EX_USAGE);
804	}
805
806	/* allocate buffer */
807	if (B_size < MINBUFSIZE)
808		B_size = MINBUFSIZE;
809	if ((buf = malloc(B_size)) == NULL)
810		errx(1, "%s", strerror(ENOMEM));
811
812	/* timeouts */
813	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
814		ftp_timeout = strtol(s, &end, 10);
815		if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
816			warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
817			ftp_timeout = 0;
818		}
819	}
820	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
821		http_timeout = strtol(s, &end, 10);
822		if (*s == '\0' || *end != '\0' || http_timeout < 0) {
823			warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
824			http_timeout = 0;
825		}
826	}
827
828	/* signal handling */
829	sa.sa_flags = 0;
830	sa.sa_handler = sig_handler;
831	sigemptyset(&sa.sa_mask);
832	sigaction(SIGALRM, &sa, NULL);
833	sa.sa_flags = SA_RESETHAND;
834	sigaction(SIGINT, &sa, NULL);
835	fetchRestartCalls = 0;
836
837	/* output file */
838	if (o_flag) {
839		if (strcmp(o_filename, "-") == 0) {
840			o_stdout = 1;
841		} else if (stat(o_filename, &sb) == -1) {
842			if (errno == ENOENT) {
843				if (argc > 1)
844					errx(EX_USAGE, "%s is not a directory",
845					    o_filename);
846			} else {
847				err(EX_IOERR, "%s", o_filename);
848			}
849		} else {
850			if (sb.st_mode & S_IFDIR)
851				o_directory = 1;
852		}
853	}
854
855	/* check if output is to a tty (for progress report) */
856	v_tty = isatty(STDERR_FILENO);
857	if (v_tty)
858		pgrp = getpgrp();
859
860	r = 0;
861
862	/* authentication */
863	if (v_tty)
864		fetchAuthMethod = query_auth;
865
866	while (argc) {
867		if ((p = strrchr(*argv, '/')) == NULL)
868			p = *argv;
869		else
870			p++;
871
872		if (!*p)
873			p = "fetch.out";
874
875		fetchLastErrCode = 0;
876
877		if (o_flag) {
878			if (o_stdout) {
879				e = fetch(*argv, "-");
880			} else if (o_directory) {
881				asprintf(&q, "%s/%s", o_filename, p);
882				e = fetch(*argv, q);
883				free(q);
884			} else {
885				e = fetch(*argv, o_filename);
886			}
887		} else {
888			e = fetch(*argv, p);
889		}
890
891		if (sigint)
892			kill(getpid(), SIGINT);
893
894		if (e == 0 && once_flag)
895			exit(0);
896
897		if (e) {
898			r = 1;
899			if ((fetchLastErrCode
900			    && fetchLastErrCode != FETCH_UNAVAIL
901			    && fetchLastErrCode != FETCH_MOVED
902			    && fetchLastErrCode != FETCH_URL
903			    && fetchLastErrCode != FETCH_RESOLV
904			    && fetchLastErrCode != FETCH_UNKNOWN)) {
905				if (w_secs && v_level)
906					fprintf(stderr, "Waiting %ld seconds "
907					    "before retrying\n", w_secs);
908				if (w_secs)
909					sleep(w_secs);
910				if (a_flag)
911					continue;
912			}
913		}
914
915		argc--, argv++;
916	}
917
918	exit(r);
919}
920