fetch.c revision 244499 
1/*-
2 * Copyright (c) 2000-2011 Dag-Erling 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: stable/9/usr.bin/fetch/fetch.c 244499 2012-12-20 18:13:04Z eadler $");
31
32#include <sys/param.h>
33#include <sys/socket.h>
34#include <sys/stat.h>
35#include <sys/time.h>
36
37#include <ctype.h>
38#include <err.h>
39#include <errno.h>
40#include <signal.h>
41#include <stdint.h>
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45#include <termios.h>
46#include <unistd.h>
47
48#include <fetch.h>
49
50#define MINBUFSIZE	4096
51#define TIMEOUT		120
52
53/* Option flags */
54int	 A_flag;	/*    -A: do not follow 302 redirects */
55int	 a_flag;	/*    -a: auto retry */
56off_t	 B_size;	/*    -B: buffer size */
57int	 b_flag;	/*!   -b: workaround TCP bug */
58char    *c_dirname;	/*    -c: remote directory */
59int	 d_flag;	/*    -d: direct connection */
60int	 F_flag;	/*    -F: restart without checking mtime  */
61char	*f_filename;	/*    -f: file to fetch */
62char	*h_hostname;	/*    -h: host to fetch from */
63int	 i_flag;	/*    -i: specify input file for mtime comparison */
64char	*i_filename;	/*        name of input file */
65int	 l_flag;	/*    -l: link rather than copy file: URLs */
66int	 m_flag;	/* -[Mm]: mirror mode */
67char	*N_filename;	/*    -N: netrc file name */
68int	 n_flag;	/*    -n: do not preserve modification time */
69int	 o_flag;	/*    -o: specify output file */
70int	 o_directory;	/*        output file is a directory */
71char	*o_filename;	/*        name of output file */
72int	 o_stdout;	/*        output file is stdout */
73int	 once_flag;	/*    -1: stop at first successful file */
74int	 p_flag;	/* -[Pp]: use passive FTP */
75int	 R_flag;	/*    -R: don't delete partially transferred files */
76int	 r_flag;	/*    -r: restart previously interrupted transfer */
77off_t	 S_size;        /*    -S: require size to match */
78int	 s_flag;        /*    -s: show size, don't fetch */
79long	 T_secs;	/*    -T: transfer timeout in seconds */
80int	 t_flag;	/*!   -t: workaround TCP bug */
81int	 U_flag;	/*    -U: do not use high ports */
82int	 v_level = 1;	/*    -v: verbosity level */
83int	 v_tty;		/*        stdout is a tty */
84pid_t	 pgrp;		/*        our process group */
85long	 w_secs;	/*    -w: retry delay */
86int	 family = PF_UNSPEC;	/* -[46]: address family to use */
87
88int	 sigalrm;	/* SIGALRM received */
89int	 siginfo;	/* SIGINFO received */
90int	 sigint;	/* SIGINT received */
91
92long	 ftp_timeout = TIMEOUT;		/* default timeout for FTP transfers */
93long	 http_timeout = TIMEOUT;	/* default timeout for HTTP transfers */
94char	*buf;		/* transfer buffer */
95
96
97/*
98 * Signal handler
99 */
100static void
101sig_handler(int sig)
102{
103	switch (sig) {
104	case SIGALRM:
105		sigalrm = 1;
106		break;
107	case SIGINFO:
108		siginfo = 1;
109		break;
110	case SIGINT:
111		sigint = 1;
112		break;
113	}
114}
115
116struct xferstat {
117	char		 name[64];
118	struct timeval	 start;
119	struct timeval	 last;
120	off_t		 size;
121	off_t		 offset;
122	off_t		 rcvd;
123};
124
125/*
126 * Compute and display ETA
127 */
128static const char *
129stat_eta(struct xferstat *xs)
130{
131	static char str[16];
132	long elapsed, eta;
133	off_t received, expected;
134
135	elapsed = xs->last.tv_sec - xs->start.tv_sec;
136	received = xs->rcvd - xs->offset;
137	expected = xs->size - xs->rcvd;
138	eta = (long)((double)elapsed * expected / received);
139	if (eta > 3600)
140		snprintf(str, sizeof str, "%02ldh%02ldm",
141		    eta / 3600, (eta % 3600) / 60);
142	else
143		snprintf(str, sizeof str, "%02ldm%02lds",
144		    eta / 60, eta % 60);
145	return (str);
146}
147
148/*
149 * Format a number as "xxxx YB" where Y is ' ', 'k', 'M'...
150 */
151static const char *prefixes = " kMGTP";
152static const char *
153stat_bytes(off_t bytes)
154{
155	static char str[16];
156	const char *prefix = prefixes;
157
158	while (bytes > 9999 && prefix[1] != '\0') {
159		bytes /= 1024;
160		prefix++;
161	}
162	snprintf(str, sizeof str, "%4jd %cB", (intmax_t)bytes, *prefix);
163	return (str);
164}
165
166/*
167 * Compute and display transfer rate
168 */
169static const char *
170stat_bps(struct xferstat *xs)
171{
172	static char str[16];
173	double delta, bps;
174
175	delta = (xs->last.tv_sec + (xs->last.tv_usec / 1.e6))
176	    - (xs->start.tv_sec + (xs->start.tv_usec / 1.e6));
177	if (delta == 0.0) {
178		snprintf(str, sizeof str, "?? Bps");
179	} else {
180		bps = (xs->rcvd - xs->offset) / delta;
181		snprintf(str, sizeof str, "%sps", stat_bytes((off_t)bps));
182	}
183	return (str);
184}
185
186/*
187 * Update the stats display
188 */
189static void
190stat_display(struct xferstat *xs, int force)
191{
192	struct timeval now;
193	int ctty_pgrp;
194
195	/* check if we're the foreground process */
196	if (ioctl(STDERR_FILENO, TIOCGPGRP, &ctty_pgrp) == -1 ||
197	    (pid_t)ctty_pgrp != pgrp)
198		return;
199
200	gettimeofday(&now, NULL);
201	if (!force && now.tv_sec <= xs->last.tv_sec)
202		return;
203	xs->last = now;
204
205	fprintf(stderr, "\r%-46.46s", xs->name);
206	if (xs->size <= 0) {
207		setproctitle("%s [%s]", xs->name, stat_bytes(xs->rcvd));
208		fprintf(stderr, "        %s", stat_bytes(xs->rcvd));
209	} else {
210		setproctitle("%s [%d%% of %s]", xs->name,
211		    (int)((100.0 * xs->rcvd) / xs->size),
212		    stat_bytes(xs->size));
213		fprintf(stderr, "%3d%% of %s",
214		    (int)((100.0 * xs->rcvd) / xs->size),
215		    stat_bytes(xs->size));
216	}
217	fprintf(stderr, " %s", stat_bps(xs));
218	if (xs->size > 0 && xs->rcvd > 0 &&
219	    xs->last.tv_sec >= xs->start.tv_sec + 10)
220		fprintf(stderr, " %s", stat_eta(xs));
221}
222
223/*
224 * Initialize the transfer statistics
225 */
226static void
227stat_start(struct xferstat *xs, const char *name, off_t size, off_t offset)
228{
229	snprintf(xs->name, sizeof xs->name, "%s", name);
230	gettimeofday(&xs->start, NULL);
231	xs->last.tv_sec = xs->last.tv_usec = 0;
232	xs->size = size;
233	xs->offset = offset;
234	xs->rcvd = offset;
235	if (v_tty && v_level > 0)
236		stat_display(xs, 1);
237	else if (v_level > 0)
238		fprintf(stderr, "%-46s", xs->name);
239}
240
241/*
242 * Update the transfer statistics
243 */
244static void
245stat_update(struct xferstat *xs, off_t rcvd)
246{
247	xs->rcvd = rcvd;
248	if (v_tty && v_level > 0)
249		stat_display(xs, 0);
250}
251
252/*
253 * Finalize the transfer statistics
254 */
255static void
256stat_end(struct xferstat *xs)
257{
258	gettimeofday(&xs->last, NULL);
259	if (v_tty && v_level > 0) {
260		stat_display(xs, 1);
261		putc('\n', stderr);
262	} else if (v_level > 0) {
263		fprintf(stderr, "        %s %s\n",
264		    stat_bytes(xs->size), stat_bps(xs));
265	}
266}
267
268/*
269 * Ask the user for authentication details
270 */
271static int
272query_auth(struct url *URL)
273{
274	struct termios tios;
275	tcflag_t saved_flags;
276	int i, nopwd;
277
278	fprintf(stderr, "Authentication required for <%s://%s:%d/>!\n",
279	    URL->scheme, URL->host, URL->port);
280
281	fprintf(stderr, "Login: ");
282	if (fgets(URL->user, sizeof URL->user, stdin) == NULL)
283		return (-1);
284	for (i = strlen(URL->user); i >= 0; --i)
285		if (URL->user[i] == '\r' || URL->user[i] == '\n')
286			URL->user[i] = '\0';
287
288	fprintf(stderr, "Password: ");
289	if (tcgetattr(STDIN_FILENO, &tios) == 0) {
290		saved_flags = tios.c_lflag;
291		tios.c_lflag &= ~ECHO;
292		tios.c_lflag |= ECHONL|ICANON;
293		tcsetattr(STDIN_FILENO, TCSAFLUSH|TCSASOFT, &tios);
294		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
295		tios.c_lflag = saved_flags;
296		tcsetattr(STDIN_FILENO, TCSANOW|TCSASOFT, &tios);
297	} else {
298		nopwd = (fgets(URL->pwd, sizeof URL->pwd, stdin) == NULL);
299	}
300	if (nopwd)
301		return (-1);
302	for (i = strlen(URL->pwd); i >= 0; --i)
303		if (URL->pwd[i] == '\r' || URL->pwd[i] == '\n')
304			URL->pwd[i] = '\0';
305
306	return (0);
307}
308
309/*
310 * Fetch a file
311 */
312static int
313fetch(char *URL, const char *path)
314{
315	struct url *url;
316	struct url_stat us;
317	struct stat sb, nsb;
318	struct xferstat xs;
319	FILE *f, *of;
320	size_t size, readcnt, wr;
321	off_t count;
322	char flags[8];
323	const char *slash;
324	char *tmppath;
325	int r;
326	unsigned timeout;
327	char *ptr;
328
329	f = of = NULL;
330	tmppath = NULL;
331
332	timeout = 0;
333	*flags = 0;
334	count = 0;
335
336	/* set verbosity level */
337	if (v_level > 1)
338		strcat(flags, "v");
339	if (v_level > 2)
340		fetchDebug = 1;
341
342	/* parse URL */
343	url = NULL;
344	if (*URL == '\0') {
345		warnx("empty URL");
346		goto failure;
347	}
348	if ((url = fetchParseURL(URL)) == NULL) {
349		warnx("%s: parse error", URL);
350		goto failure;
351	}
352
353	/* if no scheme was specified, take a guess */
354	if (!*url->scheme) {
355		if (!*url->host)
356			strcpy(url->scheme, SCHEME_FILE);
357		else if (strncasecmp(url->host, "ftp.", 4) == 0)
358			strcpy(url->scheme, SCHEME_FTP);
359		else if (strncasecmp(url->host, "www.", 4) == 0)
360			strcpy(url->scheme, SCHEME_HTTP);
361	}
362
363	/* common flags */
364	switch (family) {
365	case PF_INET:
366		strcat(flags, "4");
367		break;
368	case PF_INET6:
369		strcat(flags, "6");
370		break;
371	}
372
373	/* FTP specific flags */
374	if (strcmp(url->scheme, SCHEME_FTP) == 0) {
375		if (p_flag)
376			strcat(flags, "p");
377		if (d_flag)
378			strcat(flags, "d");
379		if (U_flag)
380			strcat(flags, "l");
381		timeout = T_secs ? T_secs : ftp_timeout;
382	}
383
384	/* HTTP specific flags */
385	if (strcmp(url->scheme, SCHEME_HTTP) == 0 ||
386	    strcmp(url->scheme, SCHEME_HTTPS) == 0) {
387		if (d_flag)
388			strcat(flags, "d");
389		if (A_flag)
390			strcat(flags, "A");
391		timeout = T_secs ? T_secs : http_timeout;
392		if (i_flag) {
393			if (stat(i_filename, &sb)) {
394				warn("%s: stat()", i_filename);
395				goto failure;
396			}
397			url->ims_time = sb.st_mtime;
398			strcat(flags, "i");
399		}
400	}
401
402	/* set the protocol timeout. */
403	fetchTimeout = timeout;
404
405	/* just print size */
406	if (s_flag) {
407		if (timeout)
408			alarm(timeout);
409		r = fetchStat(url, &us, flags);
410		if (timeout)
411			alarm(0);
412		if (sigalrm || sigint)
413			goto signal;
414		if (r == -1) {
415			warnx("%s", fetchLastErrString);
416			goto failure;
417		}
418		if (us.size == -1)
419			printf("Unknown\n");
420		else
421			printf("%jd\n", (intmax_t)us.size);
422		goto success;
423	}
424
425	/*
426	 * If the -r flag was specified, we have to compare the local
427	 * and remote files, so we should really do a fetchStat()
428	 * first, but I know of at least one HTTP server that only
429	 * sends the content size in response to GET requests, and
430	 * leaves it out of replies to HEAD requests.  Also, in the
431	 * (frequent) case that the local and remote files match but
432	 * the local file is truncated, we have sufficient information
433	 * before the compare to issue a correct request.  Therefore,
434	 * we always issue a GET request as if we were sure the local
435	 * file was a truncated copy of the remote file; we can drop
436	 * the connection later if we change our minds.
437	 */
438	sb.st_size = -1;
439	if (!o_stdout) {
440		r = stat(path, &sb);
441		if (r == 0 && r_flag && S_ISREG(sb.st_mode)) {
442			url->offset = sb.st_size;
443		} else if (r == -1 || !S_ISREG(sb.st_mode)) {
444			/*
445			 * Whatever value sb.st_size has now is either
446			 * wrong (if stat(2) failed) or irrelevant (if the
447			 * path does not refer to a regular file)
448			 */
449			sb.st_size = -1;
450		}
451		if (r == -1 && errno != ENOENT) {
452			warnx("%s: stat()", path);
453			goto failure;
454		}
455	}
456
457	/* start the transfer */
458	if (timeout)
459		alarm(timeout);
460	f = fetchXGet(url, &us, flags);
461	if (timeout)
462		alarm(0);
463	if (sigalrm || sigint)
464		goto signal;
465	if (f == NULL) {
466		warnx("%s: %s", URL, fetchLastErrString);
467		if (i_flag && strcmp(url->scheme, SCHEME_HTTP) == 0
468		    && fetchLastErrCode == FETCH_OK
469		    && strcmp(fetchLastErrString, "Not Modified") == 0) {
470			/* HTTP Not Modified Response, return OK. */
471			r = 0;
472			goto done;
473		} else
474			goto failure;
475	}
476	if (sigint)
477		goto signal;
478
479	/* check that size is as expected */
480	if (S_size) {
481		if (us.size == -1) {
482			warnx("%s: size unknown", URL);
483		} else if (us.size != S_size) {
484			warnx("%s: size mismatch: expected %jd, actual %jd",
485			    URL, (intmax_t)S_size, (intmax_t)us.size);
486			goto failure;
487		}
488	}
489
490	/* symlink instead of copy */
491	if (l_flag && strcmp(url->scheme, "file") == 0 && !o_stdout) {
492		if (symlink(url->doc, path) == -1) {
493			warn("%s: symlink()", path);
494			goto failure;
495		}
496		goto success;
497	}
498
499	if (us.size == -1 && !o_stdout && v_level > 0)
500		warnx("%s: size of remote file is not known", URL);
501	if (v_level > 1) {
502		if (sb.st_size != -1)
503			fprintf(stderr, "local size / mtime: %jd / %ld\n",
504			    (intmax_t)sb.st_size, (long)sb.st_mtime);
505		if (us.size != -1)
506			fprintf(stderr, "remote size / mtime: %jd / %ld\n",
507			    (intmax_t)us.size, (long)us.mtime);
508	}
509
510	/* open output file */
511	if (o_stdout) {
512		/* output to stdout */
513		of = stdout;
514	} else if (r_flag && sb.st_size != -1) {
515		/* resume mode, local file exists */
516		if (!F_flag && us.mtime && sb.st_mtime != us.mtime) {
517			/* no match! have to refetch */
518			fclose(f);
519			/* if precious, warn the user and give up */
520			if (R_flag) {
521				warnx("%s: local modification time "
522				    "does not match remote", path);
523				goto failure_keep;
524			}
525		} else if (url->offset > sb.st_size) {
526			/* gap between what we asked for and what we got */
527			warnx("%s: gap in resume mode", URL);
528			fclose(of);
529			of = NULL;
530			/* picked up again later */
531		} else if (us.size != -1) {
532			if (us.size == sb.st_size)
533				/* nothing to do */
534				goto success;
535			if (sb.st_size > us.size) {
536				/* local file too long! */
537				warnx("%s: local file (%jd bytes) is longer "
538				    "than remote file (%jd bytes)", path,
539				    (intmax_t)sb.st_size, (intmax_t)us.size);
540				goto failure;
541			}
542			/* we got it, open local file */
543			if ((of = fopen(path, "r+")) == NULL) {
544				warn("%s: fopen()", path);
545				goto failure;
546			}
547			/* check that it didn't move under our feet */
548			if (fstat(fileno(of), &nsb) == -1) {
549				/* can't happen! */
550				warn("%s: fstat()", path);
551				goto failure;
552			}
553			if (nsb.st_dev != sb.st_dev ||
554			    nsb.st_ino != nsb.st_ino ||
555			    nsb.st_size != sb.st_size) {
556				warnx("%s: file has changed", URL);
557				fclose(of);
558				of = NULL;
559				sb = nsb;
560				/* picked up again later */
561			}
562		}
563		/* seek to where we left off */
564		if (of != NULL && fseeko(of, url->offset, SEEK_SET) != 0) {
565			warn("%s: fseeko()", path);
566			fclose(of);
567			of = NULL;
568			/* picked up again later */
569		}
570	} else if (m_flag && sb.st_size != -1) {
571		/* mirror mode, local file exists */
572		if (sb.st_size == us.size && sb.st_mtime == us.mtime)
573			goto success;
574	}
575
576	if (of == NULL) {
577		/*
578		 * We don't yet have an output file; either this is a
579		 * vanilla run with no special flags, or the local and
580		 * remote files didn't match.
581		 */
582
583		if (url->offset > 0) {
584			/*
585			 * We tried to restart a transfer, but for
586			 * some reason gave up - so we have to restart
587			 * from scratch if we want the whole file
588			 */
589			url->offset = 0;
590			if ((f = fetchXGet(url, &us, flags)) == NULL) {
591				warnx("%s: %s", URL, fetchLastErrString);
592				goto failure;
593			}
594			if (sigint)
595				goto signal;
596		}
597
598		/* construct a temp file name */
599		if (sb.st_size != -1 && S_ISREG(sb.st_mode)) {
600			if ((slash = strrchr(path, '/')) == NULL)
601				slash = path;
602			else
603				++slash;
604			asprintf(&tmppath, "%.*s.fetch.XXXXXX.%s",
605			    (int)(slash - path), path, slash);
606			if (tmppath != NULL) {
607				if (mkstemps(tmppath, strlen(slash) + 1) == -1) {
608					warn("%s: mkstemps()", path);
609					goto failure;
610				}
611				of = fopen(tmppath, "w");
612				chown(tmppath, sb.st_uid, sb.st_gid);
613				chmod(tmppath, sb.st_mode & ALLPERMS);
614			}
615		}
616		if (of == NULL)
617			of = fopen(path, "w");
618		if (of == NULL) {
619			warn("%s: open()", path);
620			goto failure;
621		}
622	}
623	count = url->offset;
624
625	/* start the counter */
626	stat_start(&xs, path, us.size, count);
627
628	sigalrm = siginfo = sigint = 0;
629
630	/* suck in the data */
631	signal(SIGINFO, sig_handler);
632	while (!sigint) {
633		if (us.size != -1 && us.size - count < B_size &&
634		    us.size - count >= 0)
635			size = us.size - count;
636		else
637			size = B_size;
638		if (siginfo) {
639			stat_end(&xs);
640			siginfo = 0;
641		}
642
643		if (size == 0)
644			break;
645
646		if ((readcnt = fread(buf, 1, size, f)) < size) {
647			if (ferror(f) && errno == EINTR && !sigint)
648				clearerr(f);
649			else if (readcnt == 0)
650				break;
651		}
652
653		stat_update(&xs, count += readcnt);
654		for (ptr = buf; readcnt > 0; ptr += wr, readcnt -= wr)
655			if ((wr = fwrite(ptr, 1, readcnt, of)) < readcnt) {
656				if (ferror(of) && errno == EINTR && !sigint)
657					clearerr(of);
658				else
659					break;
660			}
661		if (readcnt != 0)
662			break;
663	}
664	if (!sigalrm)
665		sigalrm = ferror(f) && errno == ETIMEDOUT;
666	signal(SIGINFO, SIG_DFL);
667
668	stat_end(&xs);
669
670	/*
671	 * If the transfer timed out or was interrupted, we still want to
672	 * set the mtime in case the file is not removed (-r or -R) and
673	 * the user later restarts the transfer.
674	 */
675 signal:
676	/* set mtime of local file */
677	if (!n_flag && us.mtime && !o_stdout && of != NULL &&
678	    (stat(path, &sb) != -1) && sb.st_mode & S_IFREG) {
679		struct timeval tv[2];
680
681		fflush(of);
682		tv[0].tv_sec = (long)(us.atime ? us.atime : us.mtime);
683		tv[1].tv_sec = (long)us.mtime;
684		tv[0].tv_usec = tv[1].tv_usec = 0;
685		if (utimes(tmppath ? tmppath : path, tv))
686			warn("%s: utimes()", tmppath ? tmppath : path);
687	}
688
689	/* timed out or interrupted? */
690	if (sigalrm)
691		warnx("transfer timed out");
692	if (sigint) {
693		warnx("transfer interrupted");
694		goto failure;
695	}
696
697	/* timeout / interrupt before connection completley established? */
698	if (f == NULL)
699		goto failure;
700
701	if (!sigalrm) {
702		/* check the status of our files */
703		if (ferror(f))
704			warn("%s", URL);
705		if (ferror(of))
706			warn("%s", path);
707		if (ferror(f) || ferror(of))
708			goto failure;
709	}
710
711	/* did the transfer complete normally? */
712	if (us.size != -1 && count < us.size) {
713		warnx("%s appears to be truncated: %jd/%jd bytes",
714		    path, (intmax_t)count, (intmax_t)us.size);
715		goto failure_keep;
716	}
717
718	/*
719	 * If the transfer timed out and we didn't know how much to
720	 * expect, assume the worst (i.e. we didn't get all of it)
721	 */
722	if (sigalrm && us.size == -1) {
723		warnx("%s may be truncated", path);
724		goto failure_keep;
725	}
726
727 success:
728	r = 0;
729	if (tmppath != NULL && rename(tmppath, path) == -1) {
730		warn("%s: rename()", path);
731		goto failure_keep;
732	}
733	goto done;
734 failure:
735	if (of && of != stdout && !R_flag && !r_flag)
736		if (stat(path, &sb) != -1 && (sb.st_mode & S_IFREG))
737			unlink(tmppath ? tmppath : path);
738	if (R_flag && tmppath != NULL && sb.st_size == -1)
739		rename(tmppath, path); /* ignore errors here */
740 failure_keep:
741	r = -1;
742	goto done;
743 done:
744	if (f)
745		fclose(f);
746	if (of && of != stdout)
747		fclose(of);
748	if (url)
749		fetchFreeURL(url);
750	if (tmppath != NULL)
751		free(tmppath);
752	return (r);
753}
754
755static void
756usage(void)
757{
758	fprintf(stderr, "%s\n%s\n%s\n%s\n",
759"usage: fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [-N file] [-o file] [-S bytes]",
760"       [-T seconds] [-w seconds] [-i file] URL ...",
761"       fetch [-146AadFlMmnPpqRrsUv] [-B bytes] [-N file] [-o file] [-S bytes]",
762"       [-T seconds] [-w seconds] [-i file] -h host -f file [-c dir]");
763}
764
765
766/*
767 * Entry point
768 */
769int
770main(int argc, char *argv[])
771{
772	struct stat sb;
773	struct sigaction sa;
774	const char *p, *s;
775	char *end, *q;
776	int c, e, r;
777
778	while ((c = getopt(argc, argv,
779	    "146AaB:bc:dFf:Hh:i:lMmN:nPpo:qRrS:sT:tUvw:")) != -1)
780		switch (c) {
781		case '1':
782			once_flag = 1;
783			break;
784		case '4':
785			family = PF_INET;
786			break;
787		case '6':
788			family = PF_INET6;
789			break;
790		case 'A':
791			A_flag = 1;
792			break;
793		case 'a':
794			a_flag = 1;
795			break;
796		case 'B':
797			B_size = (off_t)strtol(optarg, &end, 10);
798			if (*optarg == '\0' || *end != '\0')
799				errx(1, "invalid buffer size (%s)", optarg);
800			break;
801		case 'b':
802			warnx("warning: the -b option is deprecated");
803			b_flag = 1;
804			break;
805		case 'c':
806			c_dirname = optarg;
807			break;
808		case 'd':
809			d_flag = 1;
810			break;
811		case 'F':
812			F_flag = 1;
813			break;
814		case 'f':
815			f_filename = optarg;
816			break;
817		case 'H':
818			warnx("the -H option is now implicit, "
819			    "use -U to disable");
820			break;
821		case 'h':
822			h_hostname = optarg;
823			break;
824		case 'i':
825			i_flag = 1;
826			i_filename = optarg;
827			break;
828		case 'l':
829			l_flag = 1;
830			break;
831		case 'o':
832			o_flag = 1;
833			o_filename = optarg;
834			break;
835		case 'M':
836		case 'm':
837			if (r_flag)
838				errx(1, "the -m and -r flags "
839				    "are mutually exclusive");
840			m_flag = 1;
841			break;
842		case 'N':
843			N_filename = optarg;
844			break;
845		case 'n':
846			n_flag = 1;
847			break;
848		case 'P':
849		case 'p':
850			p_flag = 1;
851			break;
852		case 'q':
853			v_level = 0;
854			break;
855		case 'R':
856			R_flag = 1;
857			break;
858		case 'r':
859			if (m_flag)
860				errx(1, "the -m and -r flags "
861				    "are mutually exclusive");
862			r_flag = 1;
863			break;
864		case 'S':
865			S_size = (off_t)strtol(optarg, &end, 10);
866			if (*optarg == '\0' || *end != '\0')
867				errx(1, "invalid size (%s)", optarg);
868			break;
869		case 's':
870			s_flag = 1;
871			break;
872		case 'T':
873			T_secs = strtol(optarg, &end, 10);
874			if (*optarg == '\0' || *end != '\0')
875				errx(1, "invalid timeout (%s)", optarg);
876			break;
877		case 't':
878			t_flag = 1;
879			warnx("warning: the -t option is deprecated");
880			break;
881		case 'U':
882			U_flag = 1;
883			break;
884		case 'v':
885			v_level++;
886			break;
887		case 'w':
888			a_flag = 1;
889			w_secs = strtol(optarg, &end, 10);
890			if (*optarg == '\0' || *end != '\0')
891				errx(1, "invalid delay (%s)", optarg);
892			break;
893		default:
894			usage();
895			exit(1);
896		}
897
898	argc -= optind;
899	argv += optind;
900
901	if (h_hostname || f_filename || c_dirname) {
902		if (!h_hostname || !f_filename || argc) {
903			usage();
904			exit(1);
905		}
906		/* XXX this is a hack. */
907		if (strcspn(h_hostname, "@:/") != strlen(h_hostname))
908			errx(1, "invalid hostname");
909		if (asprintf(argv, "ftp://%s/%s/%s", h_hostname,
910		    c_dirname ? c_dirname : "", f_filename) == -1)
911			errx(1, "%s", strerror(ENOMEM));
912		argc++;
913	}
914
915	if (!argc) {
916		usage();
917		exit(1);
918	}
919
920	/* allocate buffer */
921	if (B_size < MINBUFSIZE)
922		B_size = MINBUFSIZE;
923	if ((buf = malloc(B_size)) == NULL)
924		errx(1, "%s", strerror(ENOMEM));
925
926	/* timeouts */
927	if ((s = getenv("FTP_TIMEOUT")) != NULL) {
928		ftp_timeout = strtol(s, &end, 10);
929		if (*s == '\0' || *end != '\0' || ftp_timeout < 0) {
930			warnx("FTP_TIMEOUT (%s) is not a positive integer", s);
931			ftp_timeout = 0;
932		}
933	}
934	if ((s = getenv("HTTP_TIMEOUT")) != NULL) {
935		http_timeout = strtol(s, &end, 10);
936		if (*s == '\0' || *end != '\0' || http_timeout < 0) {
937			warnx("HTTP_TIMEOUT (%s) is not a positive integer", s);
938			http_timeout = 0;
939		}
940	}
941
942	/* signal handling */
943	sa.sa_flags = 0;
944	sa.sa_handler = sig_handler;
945	sigemptyset(&sa.sa_mask);
946	sigaction(SIGALRM, &sa, NULL);
947	sa.sa_flags = SA_RESETHAND;
948	sigaction(SIGINT, &sa, NULL);
949	fetchRestartCalls = 0;
950
951	/* output file */
952	if (o_flag) {
953		if (strcmp(o_filename, "-") == 0) {
954			o_stdout = 1;
955		} else if (stat(o_filename, &sb) == -1) {
956			if (errno == ENOENT) {
957				if (argc > 1)
958					errx(1, "%s is not a directory",
959					    o_filename);
960			} else {
961				err(1, "%s", o_filename);
962			}
963		} else {
964			if (sb.st_mode & S_IFDIR)
965				o_directory = 1;
966		}
967	}
968
969	/* check if output is to a tty (for progress report) */
970	v_tty = isatty(STDERR_FILENO);
971	if (v_tty)
972		pgrp = getpgrp();
973
974	r = 0;
975
976	/* authentication */
977	if (v_tty)
978		fetchAuthMethod = query_auth;
979	if (N_filename != NULL)
980		if (setenv("NETRC", N_filename, 1) == -1)
981			err(1, "setenv: cannot set NETRC=%s", N_filename);
982
983	while (argc) {
984		if ((p = strrchr(*argv, '/')) == NULL)
985			p = *argv;
986		else
987			p++;
988
989		if (!*p)
990			p = "fetch.out";
991
992		fetchLastErrCode = 0;
993
994		if (o_flag) {
995			if (o_stdout) {
996				e = fetch(*argv, "-");
997			} else if (o_directory) {
998				asprintf(&q, "%s/%s", o_filename, p);
999				e = fetch(*argv, q);
1000				free(q);
1001			} else {
1002				e = fetch(*argv, o_filename);
1003			}
1004		} else {
1005			e = fetch(*argv, p);
1006		}
1007
1008		if (sigint)
1009			kill(getpid(), SIGINT);
1010
1011		if (e == 0 && once_flag)
1012			exit(0);
1013
1014		if (e) {
1015			r = 1;
1016			if ((fetchLastErrCode
1017			    && fetchLastErrCode != FETCH_UNAVAIL
1018			    && fetchLastErrCode != FETCH_MOVED
1019			    && fetchLastErrCode != FETCH_URL
1020			    && fetchLastErrCode != FETCH_RESOLV
1021			    && fetchLastErrCode != FETCH_UNKNOWN)) {
1022				if (w_secs && v_level)
1023					fprintf(stderr, "Waiting %ld seconds "
1024					    "before retrying\n", w_secs);
1025				if (w_secs)
1026					sleep(w_secs);
1027				if (a_flag)
1028					continue;
1029			}
1030		}
1031
1032		argc--, argv++;
1033	}
1034
1035	exit(r);
1036}
1037