aboutsummaryrefslogtreecommitdiffstats
path: root/usr.bin/fetch/fetch.c
blob: 7dfdbaf26e8cdc046dc6209abc478fab4d3ae5ea (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
/*-
 * Copyright (c) 2000 Dag-Erling Codan Smrgrav
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer
 *    in this position and unchanged.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *	$FreeBSD$
 */

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
#include <termios.h>
#include <unistd.h>

#include <fetch.h>

#define MINBUFSIZE	4096

/* Option flags */
int	 A_flag;	/*    -A: do not follow 302 redirects */
int	 a_flag;	/*    -a: auto retry */
off_t	 B_size;	/*    -B: buffer size */
int	 b_flag;	/*!   -b: workaround TCP bug */
char    *c_dirname;	/*    -c: remote directory */
int	 d_flag;	/*    -d: direct connection */
int	 F_flag;	/*    -F: restart without checking mtime  */
char	*f_filename;	/*    -f: file to fetch */
char	*h_hostname;	/*    -h: host to fetch from */
int	 l_flag;	/*    -l: link rather than copy file: URLs */
int	 m_flag;	/* -[Mm]: mirror mode */
int	 n_flag;	/*    -n: do not preserve modification time */
int	 o_flag;	/*    -o: specify output file */
int	 o_directory;	/*        output file is a directory */
char	*o_filename;	/*        name of output file */
int	 o_stdout;	/*        output file is stdout */
int	 once_flag;	/*    -1: stop at first successful file */
int	 p_flag;	/* -[Pp]: use passive FTP */
int	 R_flag;	/*    -R: don't delete partially transferred files */
int	 r_flag;	/*    -r: restart previously interrupted transfer */
off_t	 S_size;        /*    -S: require size to match */
int	 s_flag;        /*    -s: show size, don't fetch */
u_int	 T_secs = 120;	/*    -T: transfer timeout in seconds */
int	 t_flag;	/*!   -t: workaround TCP bug */
int	 U_flag;	/*    -U: do not use high ports */
int	 v_level = 1;	/*    -v: verbosity level */
int	 v_tty;		/*        stdout is a tty */
pid_t	 pgrp;		/*        our process group */
u_int	 w_secs;	/*    -w: retry delay */
int	 family = PF_UNSPEC;	/* -[46]: address family to use */

int	 sigalrm;	/* SIGALRM received */
int	 siginfo;	/* SIGINFO received */
int	 sigint;	/* SIGINT received */

u_int	 ftp_timeout;	/* default timeout for FTP transfers */
u_int	 http_timeout;	/* default timeout for HTTP transfers */
u_char	*buf;		/* transfer buffer */


/*
 * Signal handler
 */
static void
sig_handler(int sig)
{
	switch (sig) {
	case SIGALRM:
		sigalrm = 1;
		break;
	case SIGINFO:
		siginfo = 1;
		break;
	case SIGINT:
		sigint = 1;
		break;
	}
}

struct xferstat {
	char		 name[40];
	struct timeval	 start;
	struct timeval	 end;
	struct timeval	 last;
	off_t		 size;
	off_t		 offset;
	off_t		 rcvd;
};

/*
 * Update the stats display
 */
static void
stat_display(struct xferstat *xs, int force)
{
	struct timeval now;
	int ctty_pgrp;

	if (!v_tty || !v_level)
		return;

	/* check if we're the foreground process */
	if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
	    (pid_t)ctty_pgrp != pgrp)
		return;
	
	gettimeofday(&now, NULL);
	if (!force && now.tv_sec <= xs->last.tv_sec)
		return;
	xs->last = now;

	fprintf(stderr, "\rReceiving %s", xs->name);
	if (xs->size <= 0)
		fprintf(stderr, ": %lld bytes", (long long)xs->rcvd);
	else
		fprintf(stderr, " (%lld bytes): %d%%", (long long)xs->size,
		    (int)((100.0 * xs->rcvd) / xs->size));
}

/*
 * Initialize the transfer statistics
 */
static void
stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
{
	snprintf(xs->name, sizeof xs->name, "%s", name);
	gettimeofday(&xs->start, NULL);
	xs->last.tv_sec = xs->last.tv_usec = 0;
	xs->end = xs->last;
	xs->size = size;
	xs->offset = offset;
	xs->rcvd = offset;
	stat_display(xs, 1);
}

/*
 * Update the transfer statistics
 */
static void
stat_update(struct xferstat *xs, off_t rcvd)
{
	xs->rcvd = rcvd;
	stat_display(xs, 0);
}

/*
 * Finalize the transfer statistics
 */
static void
stat_end(struct xferstat *xs)
{
	double delta;
	double bps;

	if (!v_level)
		return;

	gettimeofday(&xs->end, NULL);

	stat_display(xs, 1);
	fputc('\n', stderr);
	delta = (xs->end.tv_sec + (xs->end.tv_usec / 1.e6))
	    - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
	fprintf(stderr, "%lld bytes transferred in %.1f seconds ",
	    (long long)(xs->rcvd - xs->offset), delta);
	bps = (xs->rcvd - xs->offset) / delta;
	if (bps > 1024*1024)
		fprintf(stderr, "(%.2f MBps)\n", bps / (1024*1024));
	else if (bps > 1024)
		fprintf(stderr, "(%.2f kBps)\n", bps / 1024);
	else
		fprintf(stderr, "(%.2f Bps)\n", bps);
}

/*
 * Ask the user for authentication details
 */
static int
query_auth(struct url *URL)
{
	struct termios tios;
	tcflag_t saved_flags;
	int i, nopwd;


	fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
	    URL->scheme, URL->host, URL->port);

	fprintf(stderr, "Login: ");
	if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
		return -1;
	for (i = 0; URL->user[i]; ++i)
		if (isspace(URL->user[i]))
			URL->user[i] = '\0';

	fprintf(stderr, "Password: ");
	if (tcgetattr(STDIN_FILENO, &tios) == 0) {
		saved_flags = tios.c_lflag;
		tios.c_lflag &= ~ECHO;
		tios.c_lflag |= ECHONL|ICANON;
		tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
		tios.c_lflag = saved_flags;
		tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
	} else {
		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
	}
	if (nopwd)
		return -1;

	for (i = 0; URL->pwd[i]; ++i)
		if (isspace(URL->pwd[i]))
			URL->pwd[i] = '\0';
	return 0;
}

/*
 * Fetch a file
 */
static int
fetch(char *URL, const char *path)
{
	struct url *url;
	struct url_stat us;
	struct stat sb, nsb;
	struct xferstat xs;
	FILE *f, *of;
	size_t size, wr;
	off_t count;
	char flags[8];
	const char *slash;
	char *tmppath;
	int r;
	u_int timeout;
	u_char *ptr;

	f = of = NULL;
	tmppath = NULL;

	/* parse URL */
	if ((url = fetchParseURL(URL)) == NULL) {
		warnx("%s: parse error", URL);
		goto failure;
	}

	/* if no scheme was specified, take a guess */
	if (!*url->scheme) {
		if (!*url->host)
			strcpy(url->scheme, SCHEME_FILE);
		else if (strncasecmp(url->host, "ftp.", 4) == 0)
			strcpy(url->scheme, SCHEME_FTP);
		else if (strncasecmp(url->host, "www.", 4) == 0)
			strcpy(url->scheme, SCHEME_HTTP);
	}

	timeout = 0;
	*flags = 0;
	count = 0;

	/* common flags */
	if (v_level > 1)
		strcat(flags, "v");
	if (v_level > 2)
		fetchDebug = 1;
	switch (family) {
	case PF_INET:
		strcat(flags, "4");
		break;
	case PF_INET6:
		strcat(flags, "6");
		break;
	}

	/* FTP specific flags */
	if (strcmp(url->scheme, "ftp") == 0) {
		if (p_flag)
			strcat(flags, "p");
		if (d_flag)
			strcat(flags, "d");
		if (U_flag)
			strcat(flags, "l");
		timeout = T_secs ? T_secs : ftp_timeout;
	}

	/* HTTP specific flags */
	if (strcmp(url->scheme, "http") == 0) {
		if (d_flag)
			strcat(flags, "d");
		if (A_flag)
			strcat(flags, "A");
		timeout = T_secs ? T_secs : http_timeout;
	}

	/* set the protocol timeout. */
	fetchTimeout = timeout;

	/* just print size */
	if (s_flag) {
		if (fetchStat(url, &us, flags) == -1)
			goto failure;
		if (us.size == -1)
			printf("Unknown\n");
		else
			printf("%lld\n", (long long)us.size);
		goto success;
	}

	/*
	 * If the -r flag was specified, we have to compare the local
	 * and remote files, so we should really do a fetchStat()
	 * first, but I know of at least one HTTP server that only
	 * sends the content size in response to GET requests, and
	 * leaves it out of replies to HEAD requests.  Also, in the
	 * (frequent) case that the local and remote files match but
	 * the local file is truncated, we have sufficient information
	 * before the compare to issue a correct request.  Therefore,
	 * we always issue a GET request as if we were sure the local
	 * file was a truncated copy of the remote file; we can drop
	 * the connection later if we change our minds.
	 */
	sb.st_size = -1;
	if (!o_stdout && stat(path, &sb) == -1 && errno != ENOENT) {
		warnx("%s: stat()", path);
		goto failure;
	}
	if (!o_stdout && r_flag && S_ISREG(sb.st_mode))
		url->offset = sb.st_size;

	/* start the transfer */
	if ((f = fetchXGet(url, &us, flags)) == NULL) {
		warnx("%s: %s", path, fetchLastErrString);
		goto failure;
	}
	if (sigint)
		goto signal;

	/* check that size is as expected */
	if (S_size) {
		if (us.size == -1) {
			warnx("%s: size unknown", path);
			goto failure;
		} else if (us.size != S_size) {
			warnx("%s: size mismatch: expected %lld, actual %lld",
			    path, (long long)S_size, (long long)us.size);
			goto failure;
		}
	}

	/* symlink instead of copy */
	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
		if (symlink(url->doc, path) == -1) {
			warn("%s: symlink()", path);
			goto failure;
		}
		goto success;
	}

	if (us.size == -1 && !o_stdout)
		warnx("%s: size of remote file is not known", path);
	if (v_level > 1) {
		if (sb.st_size != -1)
			fprintf(stderr, "local size / mtime: %lld / %ld\n",
			    (long long)sb.st_size, (long)sb.st_mtime);
		if (us.size != -1)
			fprintf(stderr, "remote size / mtime: %lld / %ld\n",
			    (long long)us.size, (long)us.mtime);
	}

	/* open output file */
	if (o_stdout) {
		/* output to stdout */
		of = stdout;
	} else if (r_flag && sb.st_size != -1) {
		/* resume mode, local file exists */
		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
			/* no match! have to refetch */
			fclose(f);
			/* if precious, warn the user and give up */
			if (R_flag) {
				warnx("%s: local modification time "
				    "does not match remote", path);
				goto failure_keep;
			}
		} else {
			if (us.size == sb.st_size)
				/* nothing to do */
				goto success;
			if (sb.st_size > us.size) {
				/* local file too long! */
				warnx("%s: local file (%lld bytes) is longer "
				    "than remote file (%lld bytes)", path,
				    (long long)sb.st_size, (long long)us.size);
				goto failure;
			}
			/* we got it, open local file */
			if ((of = fopen(path, "a")) == NULL) {
				warn("%s: fopen()", path);
				goto failure;
			}
			/* check that it didn't move under our feet */
			if (fstat(fileno(of), &nsb) == -1) {
				/* can't happen! */
				warn("%s: fstat()", path);
				goto failure;
			}
			if (nsb.st_dev != sb.st_dev ||
			    nsb.st_ino != nsb.st_ino ||
			    nsb.st_size != sb.st_size) {
				warnx("%s: file has changed", path);
				fclose(of);
				of = NULL;
				sb = nsb;
			}
		}
	} else if (m_flag && sb.st_size != -1) {
		/* mirror mode, local file exists */
		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
			goto success;
	}
	
	if (of == NULL) {
		/*
		 * We don't yet have an output file; either this is a
		 * vanilla run with no special flags, or the local and
		 * remote files didn't match.
		 */
		
		if (url->offset != 0) {
			/*
			 * We tried to restart a transfer, but for
			 * some reason gave up - so we have to restart
			 * from scratch if we want the whole file
			 */
			url->offset = 0;
			if ((f = fetchXGet(url, &us, flags)) == NULL) {
				warnx("%s: %s", path, fetchLastErrString);
				goto failure;
			}
			if (sigint)
				goto signal;
		}

		/* construct a temp file name */
		if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
			if ((slash = strrchr(path, '/')) == NULL)
				slash = path;
			else
				++slash;
			asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
			    (int)(slash - path), path, slash);
		}
		
		if (tmppath != NULL) {
			mkstemps(tmppath, strlen(slash) + 1);
			of = fopen(tmppath, "w");
		} else {
			of = fopen(path, "w");
		}
		
		if (of == NULL) {
			warn("%s: open()", path);
			goto failure;
		}
	}
	count = url->offset;

	/* start the counter */
	stat_start(&xs, path, us.size, count);

	sigalrm = siginfo = sigint = 0;

	/* suck in the data */
	signal(SIGINFO, sig_handler);
	while (!sigint && !sigalrm) {
		if (us.size != -1 && us.size - count < B_size &&
		    us.size - count >= 0)
			size = us.size - count;
		else
			size = B_size;
		if (timeout)
			alarm(timeout);
		if (siginfo) {
			stat_end(&xs);
			siginfo = 0;
		}
		if ((size = fread(buf, 1, size, f)) == 0) {
			if (ferror(f) && errno == EINTR && !sigalrm && !sigint)
				clearerr(f);
			else
				break;
		}
		if (timeout)
			alarm(0);
		stat_update(&xs, count += size);
		for (ptr = buf; size > 0; ptr += wr, size -= wr)
			if ((wr = fwrite(ptr, 1, size, of)) < size) {
				if (ferror(of) && errno == EINTR &&
				    !sigalrm && !sigint)
					clearerr(of);
				else
					break;
			}
		if (size != 0)
			break;
	}
	signal(SIGINFO, SIG_DFL);

	if (timeout)
		alarm(0);

	stat_end(&xs);

	/* set mtime of local file */
	if (!n_flag && us.mtime && !o_stdout
	    && (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
		struct timeval tv[2];
	
		fflush(of);
		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
		tv[1].tv_sec = (long)us.mtime;
		tv[0].tv_usec = tv[1].tv_usec = 0;
		if (utimes(tmppath ? tmppath : path, tv))
			warn("%s: utimes()", tmppath ? tmppath : path);
	}

	/* timed out or interrupted? */
 signal:
	if (sigalrm)
		warnx("transfer timed out");
	if (sigint) {
		warnx("transfer interrupted");
		goto failure;
	}

	if (!sigalrm) {
		/* check the status of our files */
		if (ferror(f))
			warn("%s", URL);
		if (ferror(of))
			warn("%s", path);
		if (ferror(f) || ferror(of))
			goto failure;
	}

	/* did the transfer complete normally? */
	if (us.size != -1 && count < us.size) {
		warnx("%s appears to be truncated: %lld/%lld bytes",
		    path, (long long)count, (long long)us.size);
		goto failure_keep;
	}

	/*
	 * If the transfer timed out and we didn't know how much to
	 * expect, assume the worst (i.e. we didn't get all of it)
	 */
	if (sigalrm && us.size == -1) {
		warnx("%s may be truncated", path);
		goto failure_keep;
	}

 success:
	r = 0;
	if (tmppath != NULL && rename(tmppath, path) == -1) {
		warn("%s: rename()", path);
		goto failure_keep;
	}
	goto done;
 failure:
	if (of && of != stdout && !R_flag && !r_flag)
		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
			unlink(tmppath ? tmppath : path);
	if (R_flag && tmppath != NULL && sb.st_size == -1)
		rename(tmppath, path); /* ignore errors here */
 failure_keep:
	r = -1;
	goto done;
 done:
	if (f)
		fclose(f);
	if (of && of != stdout)
		fclose(of);
	if (url)
		fetchFreeURL(url);
	if (tmppath != NULL)
		free(tmppath);
	return r;
}

static void
usage(void)
{
	fprintf(stderr, "%s\n%s\n%s\n",
	    "Usage: fetch [-146AFMPRUadlmnpqrsv] [-o outputfile] [-S bytes]",
	    "             [-B bytes] [-T seconds] [-w seconds]",
	    "             [-h host -f file [-c dir] | URL ...]");
}


#define PARSENUM(NAME, TYPE)				\
static int						\
NAME(const char *s, TYPE *v)				\
{							\
        *v = 0;						\
	for (*v = 0; *s; s++)				\
		if (isdigit(*s))			\
			*v = *v * 10 + *s - '0';	\
		else					\
			return -1;			\
	return 0;					\
}

PARSENUM(parseint, u_int);
PARSENUM(parseoff, off_t);

/*
 * Entry point
 */
int
main(int argc, char *argv[])
{
	struct stat sb;
	struct sigaction sa;
	const char *p, *s;
	char *q;
	int c, e, r;

	while ((c = getopt(argc, argv,
	    "146AaB:bc:dFf:Hh:lMmnPpo:qRrS:sT:tUvw:")) != EOF)
		switch (c) {
		case '1':
			once_flag = 1;
			break;
		case '4':
			family = PF_INET;
			break;
		case '6':
			family = PF_INET6;
			break;
		case 'A':
			A_flag = 1;
			break;
		case 'a':
			a_flag = 1;
			break;
		case 'B':
			if (parseoff(optarg, &B_size) == -1)
				errx(1, "invalid buffer size (%s)", optarg);
			break;
		case 'b':
			warnx("warning: the -b option is deprecated");
			b_flag = 1;
			break;
		case 'c':
			c_dirname = optarg;
			break;
		case 'd':
			d_flag = 1;
			break;
		case 'F':
			F_flag = 1;
			break;
		case 'f':
			f_filename = optarg;
			break;
		case 'H':
			warnx("The -H option is now implicit, "
			    "use -U to disable");
			break;
		case 'h':
			h_hostname = optarg;
			break;
		case 'l':
			l_flag = 1;
			break;
		case 'o':
			o_flag = 1;
			o_filename = optarg;
			break;
		case 'M':
		case 'm':
			if (r_flag)
				errx(1, "the -m and -r flags "
				    "are mutually exclusive");
			m_flag = 1;
			break;
		case 'n':
			n_flag = 1;
			break;
		case 'P':
		case 'p':
			p_flag = 1;
			break;
		case 'q':
			v_level = 0;
			break;
		case 'R':
			R_flag = 1;
			break;
		case 'r':
			if (m_flag)
				errx(1, "the -m and -r flags "
				    "are mutually exclusive");
			r_flag = 1;
			break;
		case 'S':
			if (parseoff(optarg, &S_size) == -1)
				errx(1, "invalid size (%s)", optarg);
			break;
		case 's':
			s_flag = 1;
			break;
		case 'T':
			if (parseint(optarg, &T_secs) == -1)
				errx(1, "invalid timeout (%s)", optarg);
			break;
		case 't':
			t_flag = 1;
			warnx("warning: the -t option is deprecated");
			break;
		case 'U':
			U_flag = 1;
			break;
		case 'v':
			v_level++;
			break;
		case 'w':
			a_flag = 1;
			if (parseint(optarg, &w_secs) == -1)
				errx(1, "invalid delay (%s)", optarg);
			break;
		default:
			usage();
			exit(EX_USAGE);
		}

	argc -= optind;
	argv += optind;

	if (h_hostname || f_filename || c_dirname) {
		if (!h_hostname || !f_filename || argc) {
			usage();
			exit(EX_USAGE);
		}
		/* XXX this is a hack. */
		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
			errx(1, "invalid hostname");
		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
		    c_dirname ? c_dirname : "", f_filename) == -1)
			errx(1, "%s", strerror(ENOMEM));
		argc++;
	}

	if (!argc) {
		usage();
		exit(EX_USAGE);
	}

	/* allocate buffer */
	if (B_size < MINBUFSIZE)
		B_size = MINBUFSIZE;
	if ((buf = malloc(B_size)) == NULL)
		errx(1, "%s", strerror(ENOMEM));

	/* timeouts */
	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
		if (parseint(s, &ftp_timeout) == -1) {
			warnx("FTP_TIMEOUT (%s) is not a positive integer",
			    optarg);
			ftp_timeout = 0;
		}
	}
	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
		if (parseint(s, &http_timeout) == -1) {
			warnx("HTTP_TIMEOUT (%s) is not a positive integer",
			    optarg);
			http_timeout = 0;
		}
	}

	/* signal handling */
	sa.sa_flags = 0;
	sa.sa_handler = sig_handler;
	sigemptyset(&sa.sa_mask);
	sigaction(SIGALRM, &sa, NULL);
	sa.sa_flags = SA_RESETHAND;
	sigaction(SIGINT, &sa, NULL);
	fetchRestartCalls = 0;

	/* output file */
	if (o_flag) {
		if (strcmp(o_filename, "-") == 0) {
			o_stdout = 1;
		} else if (stat(o_filename, &sb) == -1) {
			if (errno == ENOENT) {
				if (argc > 1)
					errx(EX_USAGE, "%s is not a directory",
					    o_filename);
			} else {
				err(EX_IOERR, "%s", o_filename);
			}
		} else {
			if (sb.st_mode & S_IFDIR)
				o_directory = 1;
		}
	}

	/* check if output is to a tty (for progress report) */
	v_tty = isatty(STDERR_FILENO);
	if (v_tty)
		pgrp = getpgrp();
	
	r = 0;
	
	/* authentication */
	if (v_tty)
		fetchAuthMethod = query_auth;

	while (argc) {
		if ((p = strrchr(*argv, '/')) == NULL)
			p = *argv;
		else
			p++;

		if (!*p)
			p = "fetch.out";
	
		fetchLastErrCode = 0;
	
		if (o_flag) {
			if (o_stdout) {
				e = fetch(*argv, "-");
			} else if (o_directory) {
				asprintf(&q, "%s/%s", o_filename, p);
				e = fetch(*argv, q);
				free(q);
			} else {
				e = fetch(*argv, o_filename);
			}
		} else {
			e = fetch(*argv, p);
		}

		if (sigint)
			kill(getpid(), SIGINT);
	
		if (e == 0 && once_flag)
			exit(0);
	
		if (e) {
			r = 1;
			if ((fetchLastErrCode
			    && fetchLastErrCode != FETCH_UNAVAIL
			    && fetchLastErrCode != FETCH_MOVED
			    && fetchLastErrCode != FETCH_URL
			    && fetchLastErrCode != FETCH_RESOLV
			    && fetchLastErrCode != FETCH_UNKNOWN)) {
				if (w_secs && v_level)
					fprintf(stderr, "Waiting %d seconds "
					    "before retrying\n", w_secs);
				if (w_secs)
					sleep(w_secs);
				if (a_flag)
					continue;
			}
		}

		argc--, argv++;
	}

	exit(r);
}