fetch.c revision 81884 
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 *	$FreeBSD: head/usr.bin/fetch/fetch.c 81884 2001-08-18 10:48:55Z des $
29 */
30
31#include <sys/param.h>
32#include <sys/stat.h>
33#include <sys/socket.h>
34
35#include <ctype.h>
36#include <err.h>
37#include <errno.h>
38#include <signal.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <sysexits.h>
43#include <termios.h>
44#include <unistd.h>
45
46#include <fetch.h>
47
48#define MINBUFSIZE	4096
49
50/* Option flags */
51int	 A_flag;	/*    -A: do not follow 302 redirects */
52int	 a_flag;	/*    -a: auto retry */
53off_t	 B_size;	/*    -B: buffer size */
54int	 b_flag;	/*!   -b: workaround TCP bug */
55char    *c_dirname;	/*    -c: remote directory */
56int	 d_flag;	/*    -d: direct connection */
57int	 F_flag;	/*    -F: restart without checking mtime  */
58char	*f_filename;	/*    -f: file to fetch */
59char	*h_hostname;	/*    -h: host to fetch from */
60int	 l_flag;	/*    -l: link rather than copy file: URLs */
61int	 m_flag;	/* -[Mm]: mirror mode */
62int	 n_flag;	/*    -n: do not preserve modification time */
63int	 o_flag;	/*    -o: specify output file */
64int	 o_directory;	/*        output file is a directory */
65char	*o_filename;	/*        name of output file */
66int	 o_stdout;	/*        output file is stdout */
67int	 once_flag;	/*    -1: stop at first successful file */
68int	 p_flag;	/* -[Pp]: use passive FTP */
69int	 R_flag;	/*    -R: don't delete partially transferred files */
70int	 r_flag;	/*    -r: restart previously interrupted transfer */
71off_t	 S_size;        /*    -S: require size to match */
72int	 s_flag;        /*    -s: show size, don't fetch */
73u_int	 T_secs = 120;	/*    -T: transfer timeout in seconds */
74int	 t_flag;	/*!   -t: workaround TCP bug */
75int	 U_flag;	/*    -U: do not use high ports */
76int	 v_level = 1;	/*    -v: verbosity level */
77int	 v_tty;		/*        stdout is a tty */
78u_int	 w_secs;	/*    -w: retry delay */
79int	 family = PF_UNSPEC;	/* -[46]: address family to use */
80
81int	 sigalrm;	/* SIGALRM received */
82int	 siginfo;	/* SIGINFO received */
83int	 sigint;	/* SIGINT received */
84
85u_int	 ftp_timeout;	/* default timeout for FTP transfers */
86u_int	 http_timeout;	/* default timeout for HTTP transfers */
87u_char	*buf;		/* transfer buffer */
88
89
90/*
91 * Signal handler
92 */
93static void
94sig_handler(int sig)
95{
96	switch (sig) {
97	case SIGALRM:
98		sigalrm = 1;
99		break;
100	case SIGINFO:
101		siginfo = 1;
102		break;
103	case SIGINT:
104		sigint = 1;
105		break;
106	}
107}
108
109struct xferstat {
110	char		 name[40];
111	struct timeval	 start;
112	struct timeval	 end;
113	struct timeval	 last;
114	off_t		 size;
115	off_t		 offset;
116	off_t		 rcvd;
117};
118
119/*
120 * Update the stats display
121 */
122static void
123stat_display(struct xferstat *xs, int force)
124{
125	struct timeval now;
126
127	if (!v_tty || !v_level)
128		return;
129
130	gettimeofday(&now, NULL);
131	if (!force && now.tv_sec <= xs->last.tv_sec)
132		return;
133	xs->last = now;
134
135	fprintf(stderr, "\rReceiving %s", xs->name);
136	if (xs->size <= 0)
137		fprintf(stderr, ": %lld bytes", (long long)xs->rcvd);
138	else
139		fprintf(stderr, " (%lld bytes): %d%%", (long long)xs->size,
140		    (int)((100.0 * xs->rcvd) / xs->size));
141}
142
143/*
144 * Initialize the transfer statistics
145 */
146static void
147stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
148{
149	snprintf(xs->name, sizeof xs->name, "%s", name);
150	gettimeofday(&xs->start, NULL);
151	xs->last.tv_sec = xs->last.tv_usec = 0;
152	xs->end = xs->last;
153	xs->size = size;
154	xs->offset = offset;
155	xs->rcvd = offset;
156	stat_display(xs, 1);
157}
158
159/*
160 * Update the transfer statistics
161 */
162static void
163stat_update(struct xferstat *xs, off_t rcvd)
164{
165	xs->rcvd = rcvd;
166	stat_display(xs, 0);
167}
168
169/*
170 * Finalize the transfer statistics
171 */
172static void
173stat_end(struct xferstat *xs)
174{
175	double delta;
176	double bps;
177
178	if (!v_level)
179		return;
180
181	gettimeofday(&xs->end, NULL);
182
183	stat_display(xs, 1);
184	fputc('\n', stderr);
185	delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
186	    - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
187	fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
188	    (long long)(xs->rcvd - xs->offset), delta);
189	bps = (xs->rcvd - xs->offset) / delta;
190	if (bps > 1024*1024)
191		fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
192	else if (bps > 1024)
193		fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
194	else
195		fprintf(stderr, "(%.2f Bps)\n", bps);
196}
197
198/*
199 * Ask the user for authentication details
200 */
201static int
202query_auth(struct url *URL)
203{
204	struct termios tios;
205	tcflag_t saved_flags;
206	int i, nopwd;
207
208
209	fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
210	    URL->scheme, URL->host, URL->port, URL->doc);
211
212	fprintf(stderr, "Login: ");
213	if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
214		return -1;
215	for (i = 0; URL->user[i]; ++i)
216		if (isspace(URL->user[i]))
217			URL->user[i] = '\0';
218
219	fprintf(stderr, "Password: ");
220	if (tcgetattr(STDIN_FILENO, &tios) == 0) {
221		saved_flags = tios.c_lflag;
222		tios.c_lflag &= ~ECHO;
223		tios.c_lflag |= ECHONL|ICANON;
224		tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
225		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
226		tios.c_lflag = saved_flags;
227		tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
228	} else {
229		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
230	}
231	if (nopwd)
232		return -1;
233
234	for (i = 0; URL->pwd[i]; ++i)
235		if (isspace(URL->pwd[i]))
236			URL->pwd[i] = '\0';
237	return 0;
238}
239
240/*
241 * Fetch a file
242 */
243static int
244fetch(char *URL, const char *path)
245{
246	struct url *url;
247	struct url_stat us;
248	struct stat sb;
249	struct xferstat xs;
250	FILE *f, *of;
251	size_t size, wr;
252	off_t count;
253	char flags[8];
254	int r;
255	u_int timeout;
256	u_char *ptr;
257
258	f = of = NULL;
259
260	/* parse URL */
261	if ((url = fetchParseURL(URL)) == NULL) {
262		warnx("%s: parse error", URL);
263		goto failure;
264	}
265
266	/* if no scheme was specified, take a guess */
267	if (!*url->scheme) {
268		if (!*url->host)
269			strcpy(url->scheme, SCHEME_FILE);
270		else if (strncasecmp(url->host, "ftp.", 4) == 0)
271			strcpy(url->scheme, SCHEME_FTP);
272		else if (strncasecmp(url->host, "www.", 4) == 0)
273			strcpy(url->scheme, SCHEME_HTTP);
274	}
275
276	timeout = 0;
277	*flags = 0;
278	count = 0;
279
280	/* common flags */
281	if (v_level > 1)
282		strcat(flags, "v");
283	switch (family) {
284	case PF_INET:
285		strcat(flags, "4");
286		break;
287	case PF_INET6:
288		strcat(flags, "6");
289		break;
290	}
291
292	/* FTP specific flags */
293	if (strcmp(url->scheme, "ftp") == 0) {
294		if (p_flag)
295			strcat(flags, "p");
296		if (d_flag)
297			strcat(flags, "d");
298		if (U_flag)
299			strcat(flags, "l");
300		timeout = T_secs ? T_secs : ftp_timeout;
301	}
302
303	/* HTTP specific flags */
304	if (strcmp(url->scheme, "http") == 0) {
305		if (d_flag)
306			strcat(flags, "d");
307		if (A_flag)
308			strcat(flags, "A");
309		timeout = T_secs ? T_secs : http_timeout;
310	}
311
312	/* set the protocol timeout. */
313	fetchTimeout = timeout;
314
315	/* just print size */
316	if (s_flag) {
317		if (fetchStat(url, &us, flags) == -1)
318			goto failure;
319		if (us.size == -1)
320			printf("Unknown\n");
321		else
322			printf("%lld\n", (long long)us.size);
323		goto success;
324	}
325
326	/*
327	 * If the -r flag was specified, we have to compare the local
328	 * and remote files, so we should really do a fetchStat()
329	 * first, but I know of at least one HTTP server that only
330	 * sends the content size in response to GET requests, and
331	 * leaves it out of replies to HEAD requests.  Also, in the
332	 * (frequent) case that the local and remote files match but
333	 * the local file is truncated, we have sufficient information
334	 * before the compare to issue a correct request.  Therefore,
335	 * we always issue a GET request as if we were sure the local
336	 * file was a truncated copy of the remote file; we can drop
337	 * the connection later if we change our minds.
338	 */
339	if ((r_flag  || m_flag) && !o_stdout && stat(path, &sb) != -1) {
340		if (r_flag)
341			url->offset = sb.st_size;
342	} else {
343		sb.st_size = -1;
344	}
345
346	/* start the transfer */
347	if ((f = fetchXGet(url, &us, flags)) == NULL) {
348		warnx("%s: %s", path, fetchLastErrString);
349		goto failure;
350	}
351	if (sigint)
352		goto signal;
353
354	/* check that size is as expected */
355	if (S_size) {
356		if (us.size == -1) {
357			warnx("%s: size unknown", path);
358			goto failure;
359		} else if (us.size != S_size) {
360			warnx("%s: size mismatch: expected %lld, actual %lld",
361			    path, (long long)S_size, (long long)us.size);
362			goto failure;
363		}
364	}
365
366	/* symlink instead of copy */
367	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
368		if (symlink(url->doc, path) == -1) {
369			warn("%s: symlink()", path);
370			goto failure;
371		}
372		goto success;
373	}
374
375	if (us.size == -1 && !o_stdout)
376		warnx("%s: size of remote file is not known", path);
377	if (v_level > 1) {
378		if (sb.st_size != -1)
379			fprintf(stderr, "local size / mtime: %lld / %ld\n",
380			    (long long)sb.st_size, (long)sb.st_mtime);
381		if (us.size != -1)
382			fprintf(stderr, "remote size / mtime: %lld / %ld\n",
383			    (long long)us.size, (long)us.mtime);
384	}
385
386	/* open output file */
387	if (o_stdout) {
388		/* output to stdout */
389		of = stdout;
390	} else if (sb.st_size != -1) {
391		/* resume mode, local file exists */
392		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
393			/* no match! have to refetch */
394			fclose(f);
395			/* if precious, warn the user and give up */
396			if (R_flag) {
397				warnx("%s: local modification time "
398				    "does not match remote", path);
399				goto failure_keep;
400			}
401			url->offset = 0;
402			if ((f = fetchXGet(url, &us, flags)) == NULL) {
403				warnx("%s: %s", path, fetchLastErrString);
404				goto failure;
405			}
406			if (sigint)
407				goto signal;
408		} else {
409			if (us.size == sb.st_size)
410				/* nothing to do */
411				goto success;
412			if (sb.st_size > us.size) {
413				/* local file too long! */
414				warnx("%s: local file (%lld bytes) is longer "
415				    "than remote file (%lld bytes)", path,
416				    (long long)sb.st_size, (long long)us.size);
417				goto failure;
418			}
419			/* we got it, open local file and seek to offset */
420			/*
421			 * XXX there's a race condition here - the
422			 * file we open is not necessarily the same as
423			 * the one we stat()'ed earlier...
424			 */
425			if ((of = fopen(path, "a")) == NULL) {
426				warn("%s: fopen()", path);
427				goto failure;
428			}
429			if (fseek(of, url->offset, SEEK_SET) == -1) {
430				warn("%s: fseek()", path);
431				goto failure;
432			}
433		}
434	}
435	if (m_flag && sb.st_size != -1) {
436		/* mirror mode, local file exists */
437		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
438			goto success;
439	}
440	if (!of) {
441		/*
442		 * We don't yet have an output file; either this is a
443		 * vanilla run with no special flags, or the local and
444		 * remote files didn't match.
445		 */
446		if ((of = fopen(path, "w")) == NULL) {
447			warn("%s: open()", path);
448			goto failure;
449		}
450	}
451	count = url->offset;
452
453	/* start the counter */
454	stat_start(&xs, path, us.size, count);
455
456	sigalrm = siginfo = sigint = 0;
457
458	/* suck in the data */
459	signal(SIGINFO, sig_handler);
460	while (!sigint && !sigalrm) {
461		if (us.size != -1 && us.size - count < B_size)
462			size = us.size - count;
463		else
464			size = B_size;
465		if (timeout)
466			alarm(timeout);
467		if (siginfo) {
468			stat_end(&xs);
469			siginfo = 0;
470		}
471		if ((size = fread(buf, 1, size, f)) == 0) {
472			if (ferror(f) && errno == EINTR && !sigalrm && !sigint)
473				clearerr(f);
474			else
475				break;
476		}
477		if (timeout)
478			alarm(0);
479		stat_update(&xs, count += size);
480		for (ptr = buf; size > 0; ptr += wr, size -= wr)
481			if ((wr = fwrite(ptr, 1, size, of)) < size) {
482				if (ferror(of) && errno == EINTR &&
483				    !sigalrm && !sigint)
484					clearerr(of);
485				else
486					break;
487			}
488		if (size != 0)
489			break;
490	}
491	signal(SIGINFO, SIG_DFL);
492
493	if (timeout)
494		alarm(0);
495
496	stat_end(&xs);
497
498	/* set mtime of local file */
499	if (!n_flag && us.mtime && !o_stdout
500	    && (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
501		struct timeval tv[2];
502
503		fflush(of);
504		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
505		tv[1].tv_sec = (long)us.mtime;
506		tv[0].tv_usec = tv[1].tv_usec = 0;
507		if (utimes(path, tv))
508			warn("%s: utimes()", path);
509	}
510
511	/* timed out or interrupted? */
512 signal:
513	if (sigalrm)
514		warnx("transfer timed out");
515	if (sigint) {
516		warnx("transfer interrupted");
517		goto failure;
518	}
519
520	if (!sigalrm) {
521		/* check the status of our files */
522		if (ferror(f))
523			warn("%s", URL);
524		if (ferror(of))
525			warn("%s", path);
526		if (ferror(f) || ferror(of))
527			goto failure;
528	}
529
530	/* did the transfer complete normally? */
531	if (us.size != -1 && count < us.size) {
532		warnx("%s appears to be truncated: %lld/%lld bytes",
533		    path, (long long)count, (long long)us.size);
534		goto failure_keep;
535	}
536
537	/*
538	 * If the transfer timed out and we didn't know how much to
539	 * expect, assume the worst (i.e. we didn't get all of it)
540	 */
541	if (sigalrm && us.size == -1) {
542		warnx("%s may be truncated", path);
543		goto failure_keep;
544	}
545
546 success:
547	r = 0;
548	goto done;
549 failure:
550	if (of && of != stdout && !R_flag && !r_flag)
551		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
552			unlink(path);
553 failure_keep:
554	r = -1;
555	goto done;
556 done:
557	if (f)
558		fclose(f);
559	if (of && of != stdout)
560		fclose(of);
561	if (url)
562		fetchFreeURL(url);
563	return r;
564}
565
566static void
567usage(void)
568{
569	fprintf(stderr, "%s\n%s\n%s\n",
570	    "Usage: fetch [-146AFMPRUadlmnpqrsv] [-o outputfile] [-S bytes]",
571	    "             [-B bytes] [-T seconds] [-w seconds]",
572	    "             [-h host -f file [-c dir] | URL ...]");
573}
574
575
576#define PARSENUM(NAME, TYPE)				\
577static int						\
578NAME(const char *s, TYPE *v)				\
579{							\
580        *v = 0;						\
581	for (*v = 0; *s; s++)				\
582		if (isdigit(*s))			\
583			*v = *v * 10 + *s - '0';	\
584		else					\
585			return -1;			\
586	return 0;					\
587}
588
589PARSENUM(parseint, u_int);
590PARSENUM(parseoff, off_t);
591
592/*
593 * Entry point
594 */
595int
596main(int argc, char *argv[])
597{
598	struct stat sb;
599	struct sigaction sa;
600	const char *p, *s;
601	char *q;
602	int c, e, r;
603
604	while ((c = getopt(argc, argv,
605	    "146AaB:bc:dFf:Hh:lMmnPpo:qRrS:sT:tUvw:")) != EOF)
606		switch (c) {
607		case '1':
608			once_flag = 1;
609			break;
610		case '4':
611			family = PF_INET;
612			break;
613		case '6':
614			family = PF_INET6;
615			break;
616		case 'A':
617			A_flag = 1;
618			break;
619		case 'a':
620			a_flag = 1;
621			break;
622		case 'B':
623			if (parseoff(optarg, &B_size) == -1)
624				errx(1, "invalid buffer size (%s)", optarg);
625			break;
626		case 'b':
627			warnx("warning: the -b option is deprecated");
628			b_flag = 1;
629			break;
630		case 'c':
631			c_dirname = optarg;
632			break;
633		case 'd':
634			d_flag = 1;
635			break;
636		case 'F':
637			F_flag = 1;
638			break;
639		case 'f':
640			f_filename = optarg;
641			break;
642		case 'H':
643			warnx("The -H option is now implicit, "
644			    "use -U to disable");
645			break;
646		case 'h':
647			h_hostname = optarg;
648			break;
649		case 'l':
650			l_flag = 1;
651			break;
652		case 'o':
653			o_flag = 1;
654			o_filename = optarg;
655			break;
656		case 'M':
657		case 'm':
658			if (r_flag)
659				errx(1, "the -m and -r flags "
660				    "are mutually exclusive");
661			m_flag = 1;
662			break;
663		case 'n':
664			n_flag = 1;
665			break;
666		case 'P':
667		case 'p':
668			p_flag = 1;
669			break;
670		case 'q':
671			v_level = 0;
672			break;
673		case 'R':
674			R_flag = 1;
675			break;
676		case 'r':
677			if (m_flag)
678				errx(1, "the -m and -r flags "
679				    "are mutually exclusive");
680			r_flag = 1;
681			break;
682		case 'S':
683			if (parseoff(optarg, &S_size) == -1)
684				errx(1, "invalid size (%s)", optarg);
685			break;
686		case 's':
687			s_flag = 1;
688			break;
689		case 'T':
690			if (parseint(optarg, &T_secs) == -1)
691				errx(1, "invalid timeout (%s)", optarg);
692			break;
693		case 't':
694			t_flag = 1;
695			warnx("warning: the -t option is deprecated");
696			break;
697		case 'U':
698			U_flag = 1;
699			break;
700		case 'v':
701			v_level++;
702			break;
703		case 'w':
704			a_flag = 1;
705			if (parseint(optarg, &w_secs) == -1)
706				errx(1, "invalid delay (%s)", optarg);
707			break;
708		default:
709			usage();
710			exit(EX_USAGE);
711		}
712
713	argc -= optind;
714	argv += optind;
715
716	if (h_hostname || f_filename || c_dirname) {
717		if (!h_hostname || !f_filename || argc) {
718			usage();
719			exit(EX_USAGE);
720		}
721		/* XXX this is a hack. */
722		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
723			errx(1, "invalid hostname");
724		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
725		    c_dirname ? c_dirname : "", f_filename) == -1)
726			errx(1, "%s", strerror(ENOMEM));
727		argc++;
728	}
729
730	if (!argc) {
731		usage();
732		exit(EX_USAGE);
733	}
734
735	/* allocate buffer */
736	if (B_size < MINBUFSIZE)
737		B_size = MINBUFSIZE;
738	if ((buf = malloc(B_size)) == NULL)
739		errx(1, "%s", strerror(ENOMEM));
740
741	/* timeouts */
742	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
743		if (parseint(s, &ftp_timeout) == -1) {
744			warnx("FTP_TIMEOUT (%s) is not a positive integer",
745			    optarg);
746			ftp_timeout = 0;
747		}
748	}
749	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
750		if (parseint(s, &http_timeout) == -1) {
751			warnx("HTTP_TIMEOUT (%s) is not a positive integer",
752			    optarg);
753			http_timeout = 0;
754		}
755	}
756
757	/* signal handling */
758	sa.sa_flags = 0;
759	sa.sa_handler = sig_handler;
760	sigemptyset(&sa.sa_mask);
761	sigaction(SIGALRM, &sa, NULL);
762	sa.sa_flags = SA_RESETHAND;
763	sigaction(SIGINT, &sa, NULL);
764	fetchRestartCalls = 0;
765
766	/* output file */
767	if (o_flag) {
768		if (strcmp(o_filename, "-") == 0) {
769			o_stdout = 1;
770		} else if (stat(o_filename, &sb) == -1) {
771			if (errno == ENOENT) {
772				if (argc > 1)
773					errx(EX_USAGE, "%s is not a directory",
774					    o_filename);
775			} else {
776				err(EX_IOERR, "%s", o_filename);
777			}
778		} else {
779			if (sb.st_mode & S_IFDIR)
780				o_directory = 1;
781		}
782	}
783
784	/* check if output is to a tty (for progress report) */
785	v_tty = isatty(STDERR_FILENO);
786	r = 0;
787
788	/* authentication */
789	if (v_tty)
790		fetchAuthMethod = query_auth;
791
792	while (argc) {
793		if ((p = strrchr(*argv, '/')) == NULL)
794			p = *argv;
795		else
796			p++;
797
798		if (!*p)
799			p = "fetch.out";
800
801		fetchLastErrCode = 0;
802
803		if (o_flag) {
804			if (o_stdout) {
805				e = fetch(*argv, "-");
806			} else if (o_directory) {
807				asprintf(&q, "%s/%s", o_filename, p);
808				e = fetch(*argv, q);
809				free(q);
810			} else {
811				e = fetch(*argv, o_filename);
812			}
813		} else {
814			e = fetch(*argv, p);
815		}
816
817		if (sigint)
818			kill(getpid(), SIGINT);
819
820		if (e == 0 && once_flag)
821			exit(0);
822
823		if (e) {
824			r = 1;
825			if ((fetchLastErrCode
826			    && fetchLastErrCode != FETCH_UNAVAIL
827			    && fetchLastErrCode != FETCH_MOVED
828			    && fetchLastErrCode != FETCH_URL
829			    && fetchLastErrCode != FETCH_RESOLV
830			    && fetchLastErrCode != FETCH_UNKNOWN)) {
831				if (w_secs && v_level)
832					fprintf(stderr, "Waiting %d seconds "
833					    "before retrying\n", w_secs);
834				if (w_secs)
835					sleep(w_secs);
836				if (a_flag)
837					continue;
838			}
839		}
840
841		argc--, argv++;
842	}
843
844	exit(r);
845}
846