fetch.c revision 83863 
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 83863 2001-09-23 22:03:39Z des $
29 */
30
31#include <sys/param.h>
32#include <sys/stat.h>
33#include <sys/socket.h>
34#include <sys/ioctl.h>
35
36#include <ctype.h>
37#include <err.h>
38#include <errno.h>
39#include <signal.h>
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43#include <sysexits.h>
44#include <termios.h>
45#include <unistd.h>
46
47#include <fetch.h>
48
49#define MINBUFSIZE	4096
50
51/* Option flags */
52int	 A_flag;	/*    -A: do not follow 302 redirects */
53int	 a_flag;	/*    -a: auto retry */
54off_t	 B_size;	/*    -B: buffer size */
55int	 b_flag;	/*!   -b: workaround TCP bug */
56char    *c_dirname;	/*    -c: remote directory */
57int	 d_flag;	/*    -d: direct connection */
58int	 F_flag;	/*    -F: restart without checking mtime  */
59char	*f_filename;	/*    -f: file to fetch */
60char	*h_hostname;	/*    -h: host to fetch from */
61int	 l_flag;	/*    -l: link rather than copy file: URLs */
62int	 m_flag;	/* -[Mm]: mirror mode */
63int	 n_flag;	/*    -n: do not preserve modification time */
64int	 o_flag;	/*    -o: specify output file */
65int	 o_directory;	/*        output file is a directory */
66char	*o_filename;	/*        name of output file */
67int	 o_stdout;	/*        output file is stdout */
68int	 once_flag;	/*    -1: stop at first successful file */
69int	 p_flag;	/* -[Pp]: use passive FTP */
70int	 R_flag;	/*    -R: don't delete partially transferred files */
71int	 r_flag;	/*    -r: restart previously interrupted transfer */
72off_t	 S_size;        /*    -S: require size to match */
73int	 s_flag;        /*    -s: show size, don't fetch */
74u_int	 T_secs = 120;	/*    -T: transfer timeout in seconds */
75int	 t_flag;	/*!   -t: workaround TCP bug */
76int	 U_flag;	/*    -U: do not use high ports */
77int	 v_level = 1;	/*    -v: verbosity level */
78int	 v_tty;		/*        stdout is a tty */
79pid_t	 pgrp;		/*        our process group */
80u_int	 w_secs;	/*    -w: retry delay */
81int	 family = PF_UNSPEC;	/* -[46]: address family to use */
82
83int	 sigalrm;	/* SIGALRM received */
84int	 siginfo;	/* SIGINFO received */
85int	 sigint;	/* SIGINT received */
86
87u_int	 ftp_timeout;	/* default timeout for FTP transfers */
88u_int	 http_timeout;	/* default timeout for HTTP transfers */
89u_char	*buf;		/* transfer buffer */
90
91
92/*
93 * Signal handler
94 */
95static void
96sig_handler(int sig)
97{
98	switch (sig) {
99	case SIGALRM:
100		sigalrm = 1;
101		break;
102	case SIGINFO:
103		siginfo = 1;
104		break;
105	case SIGINT:
106		sigint = 1;
107		break;
108	}
109}
110
111struct xferstat {
112	char		 name[40];
113	struct timeval	 start;
114	struct timeval	 end;
115	struct timeval	 last;
116	off_t		 size;
117	off_t		 offset;
118	off_t		 rcvd;
119};
120
121/*
122 * Update the stats display
123 */
124static void
125stat_display(struct xferstat *xs, int force)
126{
127	struct timeval now;
128	int ctty_pgrp;
129
130	if (!v_tty || !v_level)
131		return;
132
133	/* check if we're the foreground process */
134	if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
135	    (pid_t)ctty_pgrp != pgrp)
136		return;
137
138	gettimeofday(&now, NULL);
139	if (!force && now.tv_sec <= xs->last.tv_sec)
140		return;
141	xs->last = now;
142
143	fprintf(stderr, "\rReceiving %s", xs->name);
144	if (xs->size <= 0)
145		fprintf(stderr, ": %lld bytes", (long long)xs->rcvd);
146	else
147		fprintf(stderr, " (%lld bytes): %d%%", (long long)xs->size,
148		    (int)((100.0 * xs->rcvd) / xs->size));
149}
150
151/*
152 * Initialize the transfer statistics
153 */
154static void
155stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
156{
157	snprintf(xs->name, sizeof xs->name, "%s", name);
158	gettimeofday(&xs->start, NULL);
159	xs->last.tv_sec = xs->last.tv_usec = 0;
160	xs->end = xs->last;
161	xs->size = size;
162	xs->offset = offset;
163	xs->rcvd = offset;
164	stat_display(xs, 1);
165}
166
167/*
168 * Update the transfer statistics
169 */
170static void
171stat_update(struct xferstat *xs, off_t rcvd)
172{
173	xs->rcvd = rcvd;
174	stat_display(xs, 0);
175}
176
177/*
178 * Finalize the transfer statistics
179 */
180static void
181stat_end(struct xferstat *xs)
182{
183	double delta;
184	double bps;
185
186	if (!v_level)
187		return;
188
189	gettimeofday(&xs->end, NULL);
190
191	stat_display(xs, 1);
192	fputc('\n', stderr);
193	delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
194	    - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
195	fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
196	    (long long)(xs->rcvd - xs->offset), delta);
197	bps = (xs->rcvd - xs->offset) / delta;
198	if (bps > 1024*1024)
199		fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
200	else if (bps > 1024)
201		fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
202	else
203		fprintf(stderr, "(%.2f Bps)\n", bps);
204}
205
206/*
207 * Ask the user for authentication details
208 */
209static int
210query_auth(struct url *URL)
211{
212	struct termios tios;
213	tcflag_t saved_flags;
214	int i, nopwd;
215
216
217	fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
218	    URL->scheme, URL->host, URL->port, URL->doc);
219
220	fprintf(stderr, "Login: ");
221	if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
222		return -1;
223	for (i = 0; URL->user[i]; ++i)
224		if (isspace(URL->user[i]))
225			URL->user[i] = '\0';
226
227	fprintf(stderr, "Password: ");
228	if (tcgetattr(STDIN_FILENO, &tios) == 0) {
229		saved_flags = tios.c_lflag;
230		tios.c_lflag &= ~ECHO;
231		tios.c_lflag |= ECHONL|ICANON;
232		tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
233		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
234		tios.c_lflag = saved_flags;
235		tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
236	} else {
237		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
238	}
239	if (nopwd)
240		return -1;
241
242	for (i = 0; URL->pwd[i]; ++i)
243		if (isspace(URL->pwd[i]))
244			URL->pwd[i] = '\0';
245	return 0;
246}
247
248/*
249 * Fetch a file
250 */
251static int
252fetch(char *URL, const char *path)
253{
254	struct url *url;
255	struct url_stat us;
256	struct stat sb, nsb;
257	struct xferstat xs;
258	FILE *f, *of;
259	size_t size, wr;
260	off_t count;
261	char flags[8];
262	const char *slash;
263	char *tmppath;
264	int r;
265	u_int timeout;
266	u_char *ptr;
267
268	f = of = NULL;
269	tmppath = NULL;
270
271	/* parse URL */
272	if ((url = fetchParseURL(URL)) == NULL) {
273		warnx("%s: parse error", URL);
274		goto failure;
275	}
276
277	/* if no scheme was specified, take a guess */
278	if (!*url->scheme) {
279		if (!*url->host)
280			strcpy(url->scheme, SCHEME_FILE);
281		else if (strncasecmp(url->host, "ftp.", 4) == 0)
282			strcpy(url->scheme, SCHEME_FTP);
283		else if (strncasecmp(url->host, "www.", 4) == 0)
284			strcpy(url->scheme, SCHEME_HTTP);
285	}
286
287	timeout = 0;
288	*flags = 0;
289	count = 0;
290
291	/* common flags */
292	if (v_level > 1)
293		strcat(flags, "v");
294	switch (family) {
295	case PF_INET:
296		strcat(flags, "4");
297		break;
298	case PF_INET6:
299		strcat(flags, "6");
300		break;
301	}
302
303	/* FTP specific flags */
304	if (strcmp(url->scheme, "ftp") == 0) {
305		if (p_flag)
306			strcat(flags, "p");
307		if (d_flag)
308			strcat(flags, "d");
309		if (U_flag)
310			strcat(flags, "l");
311		timeout = T_secs ? T_secs : ftp_timeout;
312	}
313
314	/* HTTP specific flags */
315	if (strcmp(url->scheme, "http") == 0) {
316		if (d_flag)
317			strcat(flags, "d");
318		if (A_flag)
319			strcat(flags, "A");
320		timeout = T_secs ? T_secs : http_timeout;
321	}
322
323	/* set the protocol timeout. */
324	fetchTimeout = timeout;
325
326	/* just print size */
327	if (s_flag) {
328		if (fetchStat(url, &us, flags) == -1)
329			goto failure;
330		if (us.size == -1)
331			printf("Unknown\n");
332		else
333			printf("%lld\n", (long long)us.size);
334		goto success;
335	}
336
337	/*
338	 * If the -r flag was specified, we have to compare the local
339	 * and remote files, so we should really do a fetchStat()
340	 * first, but I know of at least one HTTP server that only
341	 * sends the content size in response to GET requests, and
342	 * leaves it out of replies to HEAD requests.  Also, in the
343	 * (frequent) case that the local and remote files match but
344	 * the local file is truncated, we have sufficient information
345	 * before the compare to issue a correct request.  Therefore,
346	 * we always issue a GET request as if we were sure the local
347	 * file was a truncated copy of the remote file; we can drop
348	 * the connection later if we change our minds.
349	 */
350	sb.st_size = -1;
351	if (!o_stdout && stat(path, &sb) == -1 && errno != ENOENT) {
352		warnx("%s: stat()", path);
353		goto failure;
354	}
355	if (!o_stdout && r_flag && S_ISREG(sb.st_mode))
356		url->offset = sb.st_size;
357
358	/* start the transfer */
359	if ((f = fetchXGet(url, &us, flags)) == NULL) {
360		warnx("%s: %s", path, fetchLastErrString);
361		goto failure;
362	}
363	if (sigint)
364		goto signal;
365
366	/* check that size is as expected */
367	if (S_size) {
368		if (us.size == -1) {
369			warnx("%s: size unknown", path);
370			goto failure;
371		} else if (us.size != S_size) {
372			warnx("%s: size mismatch: expected %lld, actual %lld",
373			    path, (long long)S_size, (long long)us.size);
374			goto failure;
375		}
376	}
377
378	/* symlink instead of copy */
379	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
380		if (symlink(url->doc, path) == -1) {
381			warn("%s: symlink()", path);
382			goto failure;
383		}
384		goto success;
385	}
386
387	if (us.size == -1 && !o_stdout)
388		warnx("%s: size of remote file is not known", path);
389	if (v_level > 1) {
390		if (sb.st_size != -1)
391			fprintf(stderr, "local size / mtime: %lld / %ld\n",
392			    (long long)sb.st_size, (long)sb.st_mtime);
393		if (us.size != -1)
394			fprintf(stderr, "remote size / mtime: %lld / %ld\n",
395			    (long long)us.size, (long)us.mtime);
396	}
397
398	/* open output file */
399	if (o_stdout) {
400		/* output to stdout */
401		of = stdout;
402	} else if (r_flag && sb.st_size != -1) {
403		/* resume mode, local file exists */
404		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
405			/* no match! have to refetch */
406			fclose(f);
407			/* if precious, warn the user and give up */
408			if (R_flag) {
409				warnx("%s: local modification time "
410				    "does not match remote", path);
411				goto failure_keep;
412			}
413		} else {
414			if (us.size == sb.st_size)
415				/* nothing to do */
416				goto success;
417			if (sb.st_size > us.size) {
418				/* local file too long! */
419				warnx("%s: local file (%lld bytes) is longer "
420				    "than remote file (%lld bytes)", path,
421				    (long long)sb.st_size, (long long)us.size);
422				goto failure;
423			}
424			/* we got it, open local file */
425			if ((of = fopen(path, "a")) == NULL) {
426				warn("%s: fopen()", path);
427				goto failure;
428			}
429			/* check that it didn't move under our feet */
430			if (fstat(fileno(of), &nsb) == -1) {
431				/* can't happen! */
432				warn("%s: fstat()", path);
433				goto failure;
434			}
435			if (nsb.st_dev != sb.st_dev ||
436			    nsb.st_ino != nsb.st_ino ||
437			    nsb.st_size != sb.st_size) {
438				warnx("%s: file has changed", path);
439				fclose(of);
440				of = NULL;
441				sb = nsb;
442			}
443		}
444	} else if (m_flag && sb.st_size != -1) {
445		/* mirror mode, local file exists */
446		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
447			goto success;
448	}
449
450	if (of == NULL) {
451		/*
452		 * We don't yet have an output file; either this is a
453		 * vanilla run with no special flags, or the local and
454		 * remote files didn't match.
455		 */
456
457		if (url->offset != 0) {
458			/*
459			 * We tried to restart a transfer, but for
460			 * some reason gave up - so we have to restart
461			 * from scratch if we want the whole file
462			 */
463			url->offset = 0;
464			if ((f = fetchXGet(url, &us, flags)) == NULL) {
465				warnx("%s: %s", path, fetchLastErrString);
466				goto failure;
467			}
468			if (sigint)
469				goto signal;
470		}
471
472		/* construct a temp file name */
473		if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
474			if ((slash = strrchr(path, '/')) == NULL)
475				slash = path;
476			else
477				++slash;
478			asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
479			    (int)(slash - path), path, slash);
480		}
481
482		if (tmppath != NULL) {
483			mkstemps(tmppath, strlen(slash) + 1);
484			warnx("tmppath: %s", tmppath);
485			of = fopen(tmppath, "w");
486		} else {
487			of = fopen(path, "w");
488		}
489
490		if (of == NULL) {
491			warn("%s: open()", path);
492			goto failure;
493		}
494	}
495	count = url->offset;
496
497	/* start the counter */
498	stat_start(&xs, path, us.size, count);
499
500	sigalrm = siginfo = sigint = 0;
501
502	/* suck in the data */
503	signal(SIGINFO, sig_handler);
504	while (!sigint && !sigalrm) {
505		if (us.size != -1 && us.size - count < B_size)
506			size = us.size - count;
507		else
508			size = B_size;
509		if (timeout)
510			alarm(timeout);
511		if (siginfo) {
512			stat_end(&xs);
513			siginfo = 0;
514		}
515		if ((size = fread(buf, 1, size, f)) == 0) {
516			if (ferror(f) && errno == EINTR && !sigalrm && !sigint)
517				clearerr(f);
518			else
519				break;
520		}
521		if (timeout)
522			alarm(0);
523		stat_update(&xs, count += size);
524		for (ptr = buf; size > 0; ptr += wr, size -= wr)
525			if ((wr = fwrite(ptr, 1, size, of)) < size) {
526				if (ferror(of) && errno == EINTR &&
527				    !sigalrm && !sigint)
528					clearerr(of);
529				else
530					break;
531			}
532		if (size != 0)
533			break;
534	}
535	signal(SIGINFO, SIG_DFL);
536
537	if (timeout)
538		alarm(0);
539
540	stat_end(&xs);
541
542	/* set mtime of local file */
543	if (!n_flag && us.mtime && !o_stdout
544	    && (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
545		struct timeval tv[2];
546
547		fflush(of);
548		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
549		tv[1].tv_sec = (long)us.mtime;
550		tv[0].tv_usec = tv[1].tv_usec = 0;
551		if (utimes(path, tv))
552			warn("%s: utimes()", path);
553	}
554
555	/* timed out or interrupted? */
556 signal:
557	if (sigalrm)
558		warnx("transfer timed out");
559	if (sigint) {
560		warnx("transfer interrupted");
561		goto failure;
562	}
563
564	if (!sigalrm) {
565		/* check the status of our files */
566		if (ferror(f))
567			warn("%s", URL);
568		if (ferror(of))
569			warn("%s", path);
570		if (ferror(f) || ferror(of))
571			goto failure;
572	}
573
574	/* did the transfer complete normally? */
575	if (us.size != -1 && count < us.size) {
576		warnx("%s appears to be truncated: %lld/%lld bytes",
577		    path, (long long)count, (long long)us.size);
578		goto failure_keep;
579	}
580
581	/*
582	 * If the transfer timed out and we didn't know how much to
583	 * expect, assume the worst (i.e. we didn't get all of it)
584	 */
585	if (sigalrm && us.size == -1) {
586		warnx("%s may be truncated", path);
587		goto failure_keep;
588	}
589
590 success:
591	r = 0;
592	if (tmppath != NULL && rename(tmppath, path) == -1) {
593		warn("%s: rename()", path);
594		goto failure_keep;
595	}
596	goto done;
597 failure:
598	if (of && of != stdout && !R_flag && !r_flag)
599		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
600			unlink(tmppath ? tmppath : path);
601	if (R_flag && tmppath != NULL && sb.st_size == -1)
602		rename(tmppath, path); /* ignore errors here */
603 failure_keep:
604	r = -1;
605	goto done;
606 done:
607	if (f)
608		fclose(f);
609	if (of && of != stdout)
610		fclose(of);
611	if (url)
612		fetchFreeURL(url);
613	if (tmppath != NULL)
614		free(tmppath);
615	return r;
616}
617
618static void
619usage(void)
620{
621	fprintf(stderr, "%s\n%s\n%s\n",
622	    "Usage: fetch [-146AFMPRUadlmnpqrsv] [-o outputfile] [-S bytes]",
623	    "             [-B bytes] [-T seconds] [-w seconds]",
624	    "             [-h host -f file [-c dir] | URL ...]");
625}
626
627
628#define PARSENUM(NAME, TYPE)				\
629static int						\
630NAME(const char *s, TYPE *v)				\
631{							\
632        *v = 0;						\
633	for (*v = 0; *s; s++)				\
634		if (isdigit(*s))			\
635			*v = *v * 10 + *s - '0';	\
636		else					\
637			return -1;			\
638	return 0;					\
639}
640
641PARSENUM(parseint, u_int);
642PARSENUM(parseoff, off_t);
643
644/*
645 * Entry point
646 */
647int
648main(int argc, char *argv[])
649{
650	struct stat sb;
651	struct sigaction sa;
652	const char *p, *s;
653	char *q;
654	int c, e, r;
655
656	while ((c = getopt(argc, argv,
657	    "146AaB:bc:dFf:Hh:lMmnPpo:qRrS:sT:tUvw:")) != EOF)
658		switch (c) {
659		case '1':
660			once_flag = 1;
661			break;
662		case '4':
663			family = PF_INET;
664			break;
665		case '6':
666			family = PF_INET6;
667			break;
668		case 'A':
669			A_flag = 1;
670			break;
671		case 'a':
672			a_flag = 1;
673			break;
674		case 'B':
675			if (parseoff(optarg, &B_size) == -1)
676				errx(1, "invalid buffer size (%s)", optarg);
677			break;
678		case 'b':
679			warnx("warning: the -b option is deprecated");
680			b_flag = 1;
681			break;
682		case 'c':
683			c_dirname = optarg;
684			break;
685		case 'd':
686			d_flag = 1;
687			break;
688		case 'F':
689			F_flag = 1;
690			break;
691		case 'f':
692			f_filename = optarg;
693			break;
694		case 'H':
695			warnx("The -H option is now implicit, "
696			    "use -U to disable");
697			break;
698		case 'h':
699			h_hostname = optarg;
700			break;
701		case 'l':
702			l_flag = 1;
703			break;
704		case 'o':
705			o_flag = 1;
706			o_filename = optarg;
707			break;
708		case 'M':
709		case 'm':
710			if (r_flag)
711				errx(1, "the -m and -r flags "
712				    "are mutually exclusive");
713			m_flag = 1;
714			break;
715		case 'n':
716			n_flag = 1;
717			break;
718		case 'P':
719		case 'p':
720			p_flag = 1;
721			break;
722		case 'q':
723			v_level = 0;
724			break;
725		case 'R':
726			R_flag = 1;
727			break;
728		case 'r':
729			if (m_flag)
730				errx(1, "the -m and -r flags "
731				    "are mutually exclusive");
732			r_flag = 1;
733			break;
734		case 'S':
735			if (parseoff(optarg, &S_size) == -1)
736				errx(1, "invalid size (%s)", optarg);
737			break;
738		case 's':
739			s_flag = 1;
740			break;
741		case 'T':
742			if (parseint(optarg, &T_secs) == -1)
743				errx(1, "invalid timeout (%s)", optarg);
744			break;
745		case 't':
746			t_flag = 1;
747			warnx("warning: the -t option is deprecated");
748			break;
749		case 'U':
750			U_flag = 1;
751			break;
752		case 'v':
753			v_level++;
754			break;
755		case 'w':
756			a_flag = 1;
757			if (parseint(optarg, &w_secs) == -1)
758				errx(1, "invalid delay (%s)", optarg);
759			break;
760		default:
761			usage();
762			exit(EX_USAGE);
763		}
764
765	argc -= optind;
766	argv += optind;
767
768	if (h_hostname || f_filename || c_dirname) {
769		if (!h_hostname || !f_filename || argc) {
770			usage();
771			exit(EX_USAGE);
772		}
773		/* XXX this is a hack. */
774		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
775			errx(1, "invalid hostname");
776		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
777		    c_dirname ? c_dirname : "", f_filename) == -1)
778			errx(1, "%s", strerror(ENOMEM));
779		argc++;
780	}
781
782	if (!argc) {
783		usage();
784		exit(EX_USAGE);
785	}
786
787	/* allocate buffer */
788	if (B_size < MINBUFSIZE)
789		B_size = MINBUFSIZE;
790	if ((buf = malloc(B_size)) == NULL)
791		errx(1, "%s", strerror(ENOMEM));
792
793	/* timeouts */
794	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
795		if (parseint(s, &ftp_timeout) == -1) {
796			warnx("FTP_TIMEOUT (%s) is not a positive integer",
797			    optarg);
798			ftp_timeout = 0;
799		}
800	}
801	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
802		if (parseint(s, &http_timeout) == -1) {
803			warnx("HTTP_TIMEOUT (%s) is not a positive integer",
804			    optarg);
805			http_timeout = 0;
806		}
807	}
808
809	/* signal handling */
810	sa.sa_flags = 0;
811	sa.sa_handler = sig_handler;
812	sigemptyset(&sa.sa_mask);
813	sigaction(SIGALRM, &sa, NULL);
814	sa.sa_flags = SA_RESETHAND;
815	sigaction(SIGINT, &sa, NULL);
816	fetchRestartCalls = 0;
817
818	/* output file */
819	if (o_flag) {
820		if (strcmp(o_filename, "-") == 0) {
821			o_stdout = 1;
822		} else if (stat(o_filename, &sb) == -1) {
823			if (errno == ENOENT) {
824				if (argc > 1)
825					errx(EX_USAGE, "%s is not a directory",
826					    o_filename);
827			} else {
828				err(EX_IOERR, "%s", o_filename);
829			}
830		} else {
831			if (sb.st_mode & S_IFDIR)
832				o_directory = 1;
833		}
834	}
835
836	/* check if output is to a tty (for progress report) */
837	v_tty = isatty(STDERR_FILENO);
838	if (v_tty)
839		pgrp = getpgrp();
840
841	r = 0;
842
843	/* authentication */
844	if (v_tty)
845		fetchAuthMethod = query_auth;
846
847	while (argc) {
848		if ((p = strrchr(*argv, '/')) == NULL)
849			p = *argv;
850		else
851			p++;
852
853		if (!*p)
854			p = "fetch.out";
855
856		fetchLastErrCode = 0;
857
858		if (o_flag) {
859			if (o_stdout) {
860				e = fetch(*argv, "-");
861			} else if (o_directory) {
862				asprintf(&q, "%s/%s", o_filename, p);
863				e = fetch(*argv, q);
864				free(q);
865			} else {
866				e = fetch(*argv, o_filename);
867			}
868		} else {
869			e = fetch(*argv, p);
870		}
871
872		if (sigint)
873			kill(getpid(), SIGINT);
874
875		if (e == 0 && once_flag)
876			exit(0);
877
878		if (e) {
879			r = 1;
880			if ((fetchLastErrCode
881			    && fetchLastErrCode != FETCH_UNAVAIL
882			    && fetchLastErrCode != FETCH_MOVED
883			    && fetchLastErrCode != FETCH_URL
884			    && fetchLastErrCode != FETCH_RESOLV
885			    && fetchLastErrCode != FETCH_UNKNOWN)) {
886				if (w_secs && v_level)
887					fprintf(stderr, "Waiting %d seconds "
888					    "before retrying\n", w_secs);
889				if (w_secs)
890					sleep(w_secs);
891				if (a_flag)
892					continue;
893			}
894		}
895
896		argc--, argv++;
897	}
898
899	exit(r);
900}
901