ftp.c revision 62964 
1/*-
2 * Copyright (c) 1998 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/lib/libfetch/ftp.c 62964 2000-07-11 18:07:09Z des $
29 */
30
31/*
32 * Portions of this code were taken from or based on ftpio.c:
33 *
34 * ----------------------------------------------------------------------------
35 * "THE BEER-WARE LICENSE" (Revision 42):
36 * <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
37 * can do whatever you want with this stuff. If we meet some day, and you think
38 * this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
39 * ----------------------------------------------------------------------------
40 *
41 * Major Changelog:
42 *
43 * Dag-Erling Co�dan Sm�rgrav
44 * 9 Jun 1998
45 *
46 * Incorporated into libfetch
47 *
48 * Jordan K. Hubbard
49 * 17 Jan 1996
50 *
51 * Turned inside out. Now returns xfers as new file ids, not as a special
52 * `state' of FTP_t
53 *
54 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $
55 *
56 */
57
58#include <sys/param.h>
59#include <sys/socket.h>
60#include <sys/uio.h>
61#include <netinet/in.h>
62
63#include <ctype.h>
64#include <errno.h>
65#include <netdb.h>
66#include <stdarg.h>
67#include <stdio.h>
68#include <stdlib.h>
69#include <string.h>
70#include <time.h>
71#include <unistd.h>
72
73#include "fetch.h"
74#include "common.h"
75#include "ftperr.h"
76
77#define FTP_ANONYMOUS_USER	"ftp"
78#define FTP_ANONYMOUS_PASSWORD	"ftp"
79#define FTP_DEFAULT_PORT 21
80
81#define FTP_OPEN_DATA_CONNECTION	150
82#define FTP_OK				200
83#define FTP_FILE_STATUS			213
84#define FTP_SERVICE_READY		220
85#define FTP_PASSIVE_MODE		227
86#define FTP_LPASSIVE_MODE		228
87#define FTP_EPASSIVE_MODE		229
88#define FTP_LOGGED_IN			230
89#define FTP_FILE_ACTION_OK		250
90#define FTP_NEED_PASSWORD		331
91#define FTP_NEED_ACCOUNT		332
92#define FTP_FILE_OK			350
93#define FTP_SYNTAX_ERROR		500
94
95static char ENDL[2] = "\r\n";
96
97static struct url cached_host;
98static int cached_socket;
99
100static char *last_reply;
101static size_t lr_size, lr_length;
102static int last_code;
103
104#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
105			 && isdigit(foo[2]) \
106                         && (foo[3] == ' ' || foo[3] == '\0'))
107#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
108			&& isdigit(foo[2]) && foo[3] == '-')
109
110/* translate IPv4 mapped IPv6 address to IPv4 address */
111static void
112unmappedaddr(struct sockaddr_in6 *sin6)
113{
114    struct sockaddr_in *sin4;
115    u_int32_t addr;
116    int port;
117
118    if (sin6->sin6_family != AF_INET6 ||
119	!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
120	return;
121    sin4 = (struct sockaddr_in *)sin6;
122    addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
123    port = sin6->sin6_port;
124    memset(sin4, 0, sizeof(struct sockaddr_in));
125    sin4->sin_addr.s_addr = addr;
126    sin4->sin_port = port;
127    sin4->sin_family = AF_INET;
128    sin4->sin_len = sizeof(struct sockaddr_in);
129}
130
131/*
132 * Get server response
133 */
134static int
135_ftp_chkerr(int cd)
136{
137    if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
138	_fetch_syserr();
139	return -1;
140    }
141    if (isftpinfo(last_reply)) {
142	while (!isftpreply(last_reply)) {
143	    if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
144		_fetch_syserr();
145		return -1;
146	    }
147	}
148    }
149
150    while (lr_length && isspace(last_reply[lr_length-1]))
151	lr_length--;
152    last_reply[lr_length] = 0;
153
154    if (!isftpreply(last_reply)) {
155	_ftp_seterr(999);
156	return -1;
157    }
158
159    last_code = (last_reply[0] - '0') * 100
160	+ (last_reply[1] - '0') * 10
161	+ (last_reply[2] - '0');
162
163    return last_code;
164}
165
166/*
167 * Send a command and check reply
168 */
169static int
170_ftp_cmd(int cd, char *fmt, ...)
171{
172    va_list ap;
173    struct iovec iov[2];
174    char *msg;
175    int r;
176
177    va_start(ap, fmt);
178    vasprintf(&msg, fmt, ap);
179    va_end(ap);
180
181    if (msg == NULL) {
182	errno = ENOMEM;
183	_fetch_syserr();
184	return -1;
185    }
186    DEBUG(fprintf(stderr, "\033[1m>>> %s\n\033[m", msg));
187    iov[0].iov_base = msg;
188    iov[0].iov_len = strlen(msg);
189    iov[1].iov_base = ENDL;
190    iov[1].iov_len = sizeof ENDL;
191    r = writev(cd, iov, 2);
192    free(msg);
193    if (r == -1) {
194	_fetch_syserr();
195	return -1;
196    }
197
198    return _ftp_chkerr(cd);
199}
200
201/*
202 * Transfer file
203 */
204static FILE *
205_ftp_transfer(int cd, char *oper, char *file,
206	      char *mode, off_t offset, char *flags)
207{
208    struct sockaddr_storage sin;
209    struct sockaddr_in6 *sin6;
210    struct sockaddr_in *sin4;
211    int pasv, high, verbose;
212    int e, sd = -1;
213    socklen_t l;
214    char *s;
215    FILE *df;
216
217    /* check flags */
218    pasv = (flags && strchr(flags, 'p'));
219    high = (flags && strchr(flags, 'h'));
220    verbose = (flags && strchr(flags, 'v'));
221
222    /* passive mode */
223    if (!pasv && (s = getenv("FTP_PASSIVE_MODE")) != NULL)
224	pasv = (strncasecmp(s, "no", 2) != 0);
225
226    /* change directory */
227    if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
228	*s = 0;
229	if (verbose)
230	    _fetch_info("changing directory to %s", file);
231	if ((e = _ftp_cmd(cd, "CWD %s", file)) != FTP_FILE_ACTION_OK) {
232	    *s = '/';
233	    if (e != -1)
234		_ftp_seterr(e);
235	    return NULL;
236	}
237	*s++ = '/';
238    } else {
239	if (verbose)
240	    _fetch_info("changing directory to /");
241	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK) {
242	    if (e != -1)
243		_ftp_seterr(e);
244	    return NULL;
245	}
246    }
247
248    /* s now points to file name */
249
250    /* find our own address, bind, and listen */
251    l = sizeof sin;
252    if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
253	goto sysouch;
254    if (sin.ss_family == AF_INET6)
255	unmappedaddr((struct sockaddr_in6 *)&sin);
256
257    /* open data socket */
258    if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
259	_fetch_syserr();
260	return NULL;
261    }
262
263    if (pasv) {
264	u_char addr[64];
265	char *ln, *p;
266	int i;
267	int port;
268
269	/* send PASV command */
270	if (verbose)
271	    _fetch_info("setting passive mode");
272	switch (sin.ss_family) {
273	case AF_INET:
274	    if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
275		goto ouch;
276	    break;
277	case AF_INET6:
278	    if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
279		if (e == -1)
280		    goto ouch;
281		if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
282		    goto ouch;
283	    }
284	    break;
285	default:
286	    e = 999;		/* XXX: error code should be prepared */
287	    goto ouch;
288	}
289
290	/*
291	 * Find address and port number. The reply to the PASV command
292         * is IMHO the one and only weak point in the FTP protocol.
293	 */
294	ln = last_reply;
295      	switch (e) {
296	case FTP_PASSIVE_MODE:
297	case FTP_LPASSIVE_MODE:
298	    for (p = ln + 3; *p && !isdigit(*p); p++)
299		/* nothing */ ;
300	    if (!*p) {
301		e = 999;
302		goto ouch;
303	    }
304	    l = (e == FTP_PASSIVE_MODE ? 6 : 21);
305	    for (i = 0; *p && i < l; i++, p++)
306		addr[i] = strtol(p, &p, 10);
307	    if (i < l) {
308		e = 999;
309		goto ouch;
310	    }
311	    break;
312	case FTP_EPASSIVE_MODE:
313	    for (p = ln + 3; *p && *p != '('; p++)
314		/* nothing */ ;
315	    if (!*p) {
316		e = 999;
317		goto ouch;
318	    }
319	    ++p;
320	    if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
321		       &port, &addr[3]) != 5 ||
322		addr[0] != addr[1] ||
323		addr[0] != addr[2] || addr[0] != addr[3]) {
324		e = 999;
325		goto ouch;
326	    }
327	    break;
328	}
329
330	/* seek to required offset */
331	if (offset)
332	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
333		goto sysouch;
334
335	/* construct sockaddr for data socket */
336	l = sizeof sin;
337	if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
338	    goto sysouch;
339	if (sin.ss_family == AF_INET6)
340	    unmappedaddr((struct sockaddr_in6 *)&sin);
341	switch (sin.ss_family) {
342	case AF_INET6:
343	    sin6 = (struct sockaddr_in6 *)&sin;
344	    if (e == FTP_EPASSIVE_MODE)
345		sin6->sin6_port = htons(port);
346	    else {
347		bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
348		bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
349	    }
350	    break;
351	case AF_INET:
352	    sin4 = (struct sockaddr_in *)&sin;
353	    if (e == FTP_EPASSIVE_MODE)
354		sin4->sin_port = htons(port);
355	    else {
356		bcopy(addr, (char *)&sin4->sin_addr, 4);
357		bcopy(addr + 4, (char *)&sin4->sin_port, 2);
358	    }
359	    break;
360	default:
361	    e = 999;		/* XXX: error code should be prepared */
362	    break;
363	}
364
365	/* connect to data port */
366	if (verbose)
367	    _fetch_info("opening data connection");
368	if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
369	    goto sysouch;
370
371	/* make the server initiate the transfer */
372	if (verbose)
373	    _fetch_info("initiating transfer");
374	e = _ftp_cmd(cd, "%s %s", oper, s);
375	if (e != FTP_OPEN_DATA_CONNECTION)
376	    goto ouch;
377
378    } else {
379	u_int32_t a;
380	u_short p;
381	int arg, d;
382	char *ap;
383	char hname[INET6_ADDRSTRLEN];
384
385	switch (sin.ss_family) {
386	case AF_INET6:
387	    ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
388#ifdef IPV6_PORTRANGE
389	    arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
390	    if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
391			   (char *)&arg, sizeof(arg)) == -1)
392		goto sysouch;
393#endif
394	    break;
395	case AF_INET:
396	    ((struct sockaddr_in *)&sin)->sin_port = 0;
397	    arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
398	    if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
399			   (char *)&arg, sizeof arg) == -1)
400		goto sysouch;
401	    break;
402	}
403	if (verbose)
404	    _fetch_info("binding data socket");
405	if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
406	    goto sysouch;
407	if (listen(sd, 1) == -1)
408	    goto sysouch;
409
410	/* find what port we're on and tell the server */
411	if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
412	    goto sysouch;
413	switch (sin.ss_family) {
414	case AF_INET:
415	    sin4 = (struct sockaddr_in *)&sin;
416	    a = ntohl(sin4->sin_addr.s_addr);
417	    p = ntohs(sin4->sin_port);
418	    e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
419			 (a >> 24) & 0xff, (a >> 16) & 0xff,
420			 (a >> 8) & 0xff, a & 0xff,
421			 (p >> 8) & 0xff, p & 0xff);
422	    break;
423	case AF_INET6:
424#define UC(b)	(((int)b)&0xff)
425	    e = -1;
426	    sin6 = (struct sockaddr_in6 *)&sin;
427	    if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
428			    hname, sizeof(hname),
429			    NULL, 0, NI_NUMERICHOST) == 0) {
430		e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
431			     htons(sin6->sin6_port));
432		if (e == -1)
433		    goto ouch;
434	    }
435	    if (e != FTP_OK) {
436		ap = (char *)&sin6->sin6_addr;
437		e = _ftp_cmd(cd,
438     "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
439			     6, 16,
440			     UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
441			     UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
442			     UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
443			     UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
444			     2,
445			     (ntohs(sin6->sin6_port) >> 8) & 0xff,
446			     ntohs(sin6->sin6_port)        & 0xff);
447	    }
448	    break;
449	default:
450	    e = 999;		/* XXX: error code should be prepared */
451	    goto ouch;
452	}
453	if (e != FTP_OK)
454	    goto ouch;
455
456	/* seek to required offset */
457	if (offset)
458	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
459		goto sysouch;
460
461	/* make the server initiate the transfer */
462	if (verbose)
463	    _fetch_info("initiating transfer");
464	e = _ftp_cmd(cd, "%s %s", oper, s);
465	if (e != FTP_OPEN_DATA_CONNECTION)
466	    goto ouch;
467
468	/* accept the incoming connection and go to town */
469	if ((d = accept(sd, NULL, NULL)) == -1)
470	    goto sysouch;
471	close(sd);
472	sd = d;
473    }
474
475    if ((df = fdopen(sd, mode)) == NULL)
476	goto sysouch;
477    return df;
478
479sysouch:
480    _fetch_syserr();
481    if (sd >= 0)
482	close(sd);
483    return NULL;
484
485ouch:
486    if (e != -1)
487	_ftp_seterr(e);
488    if (sd >= 0)
489	close(sd);
490    return NULL;
491}
492
493/*
494 * Log on to FTP server
495 */
496static int
497_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
498{
499    int cd, e, pp = 0, direct, verbose;
500#ifdef INET6
501    int af = AF_UNSPEC;
502#else
503    int af = AF_INET;
504#endif
505    char *p, *q;
506    const char *logname;
507    char localhost[MAXHOSTNAMELEN];
508    char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
509
510    direct = (flags && strchr(flags, 'd'));
511    verbose = (flags && strchr(flags, 'v'));
512    if ((flags && strchr(flags, '4')))
513	af = AF_INET;
514    else if ((flags && strchr(flags, '6')))
515	af = AF_INET6;
516
517    /* check for proxy */
518    if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
519	char c = 0;
520
521#ifdef INET6
522	if (*p != '[' || (q = strchr(p + 1, ']')) == NULL ||
523	    (*++q != '\0' && *q != ':'))
524#endif
525	    q = strchr(p, ':');
526	if (q != NULL && *q == ':') {
527	    if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) {
528		/* XXX we should emit some kind of warning */
529	    }
530	    pp = atoi(q+1);
531	    if (pp < 1 || pp > 65535) {
532		/* XXX we should emit some kind of warning */
533	    }
534	}
535	if (!pp) {
536	    struct servent *se;
537
538	    if ((se = getservbyname("ftp", "tcp")) != NULL)
539		pp = ntohs(se->s_port);
540	    else
541		pp = FTP_DEFAULT_PORT;
542	}
543	if (q) {
544#ifdef INET6
545	    if (q > p && *p == '[' && *(q - 1) == ']') {
546		p++;
547		q--;
548	    }
549#endif
550	    c = *q;
551	    *q = 0;
552	}
553	cd = _fetch_connect(p, pp, af, verbose);
554	if (q)
555	    *q = c;
556    } else {
557	/* no proxy, go straight to target */
558	cd = _fetch_connect(host, port, af, verbose);
559	p = NULL;
560    }
561
562    /* check connection */
563    if (cd == -1) {
564	_fetch_syserr();
565	return NULL;
566    }
567
568    /* expect welcome message */
569    if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
570	goto fouch;
571
572    /* send user name and password */
573    if (!user || !*user)
574	user = FTP_ANONYMOUS_USER;
575    e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
576	  : _ftp_cmd(cd, "USER %s", user);
577
578    /* did the server request a password? */
579    if (e == FTP_NEED_PASSWORD) {
580	if (!pwd || !*pwd)
581	    pwd = getenv("FTP_PASSWORD");
582	if (!pwd || !*pwd) {
583	    if ((logname = getlogin()) == 0)
584		logname = FTP_ANONYMOUS_PASSWORD;
585	    gethostname(localhost, sizeof localhost);
586	    snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost);
587	    pwd = pbuf;
588	}
589	e = _ftp_cmd(cd, "PASS %s", pwd);
590    }
591
592    /* did the server request an account? */
593    if (e == FTP_NEED_ACCOUNT)
594	goto fouch;
595
596    /* we should be done by now */
597    if (e != FTP_LOGGED_IN)
598	goto fouch;
599
600    /* might as well select mode and type at once */
601#ifdef FTP_FORCE_STREAM_MODE
602    if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
603	goto fouch;
604#endif
605    if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
606	goto fouch;
607
608    /* done */
609    return cd;
610
611fouch:
612    if (e != -1)
613	_ftp_seterr(e);
614    close(cd);
615    return NULL;
616}
617
618/*
619 * Disconnect from server
620 */
621static void
622_ftp_disconnect(int cd)
623{
624    (void)_ftp_cmd(cd, "QUIT");
625    close(cd);
626}
627
628/*
629 * Check if we're already connected
630 */
631static int
632_ftp_isconnected(struct url *url)
633{
634    return (cached_socket
635	    && (strcmp(url->host, cached_host.host) == 0)
636	    && (strcmp(url->user, cached_host.user) == 0)
637	    && (strcmp(url->pwd, cached_host.pwd) == 0)
638	    && (url->port == cached_host.port));
639}
640
641/*
642 * Check the cache, reconnect if no luck
643 */
644static int
645_ftp_cached_connect(struct url *url, char *flags)
646{
647    int e, cd;
648
649    cd = -1;
650
651    /* set default port */
652    if (!url->port) {
653	struct servent *se;
654
655	if ((se = getservbyname("ftp", "tcp")) != NULL)
656	    url->port = ntohs(se->s_port);
657	else
658	    url->port = FTP_DEFAULT_PORT;
659    }
660
661    /* try to use previously cached connection */
662    if (_ftp_isconnected(url)) {
663	e = _ftp_cmd(cached_socket, "NOOP");
664	if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
665	    cd = cached_socket;
666    }
667
668    /* connect to server */
669    if (cd == -1) {
670	cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
671	if (cd == -1)
672	    return -1;
673	if (cached_socket)
674	    _ftp_disconnect(cached_socket);
675	cached_socket = cd;
676	memcpy(&cached_host, url, sizeof *url);
677    }
678
679    return cd;
680}
681
682/*
683 * Get file
684 */
685FILE *
686fetchGetFTP(struct url *url, char *flags)
687{
688    int cd;
689
690    /* connect to server */
691    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
692	return NULL;
693
694    /* initiate the transfer */
695    return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags);
696}
697
698/*
699 * Put file
700 */
701FILE *
702fetchPutFTP(struct url *url, char *flags)
703{
704    int cd;
705
706    /* connect to server */
707    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
708	return NULL;
709
710    /* initiate the transfer */
711    return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
712			 url->doc, "w", url->offset, flags);
713}
714
715/*
716 * Get file stats
717 */
718int
719fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
720{
721    char *ln, *s;
722    struct tm tm;
723    time_t t;
724    int e, cd;
725
726    us->size = -1;
727    us->atime = us->mtime = 0;
728
729    /* connect to server */
730    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
731	return -1;
732
733    /* change directory */
734    if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
735	*s = 0;
736	if ((e = _ftp_cmd(cd, "CWD %s", url->doc)) != FTP_FILE_ACTION_OK) {
737	    *s = '/';
738	    goto ouch;
739	}
740	*s++ = '/';
741    } else {
742	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK)
743	    goto ouch;
744    }
745
746    /* s now points to file name */
747
748    if (_ftp_cmd(cd, "SIZE %s", s) != FTP_FILE_STATUS)
749	goto ouch;
750    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
751	/* nothing */ ;
752    for (us->size = 0; *ln && isdigit(*ln); ln++)
753	us->size = us->size * 10 + *ln - '0';
754    if (*ln && !isspace(*ln)) {
755	_ftp_seterr(999);
756	return -1;
757    }
758    DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
759
760    if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS)
761	goto ouch;
762    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
763	/* nothing */ ;
764    e = 999;
765    switch (strspn(ln, "0123456789")) {
766    case 14:
767	break;
768    case 15:
769	ln++;
770	ln[0] = '2';
771	ln[1] = '0';
772	break;
773    default:
774	goto ouch;
775    }
776    if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
777	       &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
778	       &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
779	goto ouch;
780    tm.tm_mon--;
781    tm.tm_year -= 1900;
782    tm.tm_isdst = -1;
783    t = timegm(&tm);
784    if (t == (time_t)-1)
785	t = time(NULL);
786    us->mtime = t;
787    us->atime = t;
788    DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
789		  "%02d:%02d:%02d\033[m]\n",
790		  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
791		  tm.tm_hour, tm.tm_min, tm.tm_sec));
792    return 0;
793
794ouch:
795    if (e != -1)
796	_ftp_seterr(e);
797    return -1;
798}
799
800/*
801 * List a directory
802 */
803extern void warnx(char *, ...);
804struct url_ent *
805fetchListFTP(struct url *url, char *flags)
806{
807    warnx("fetchListFTP(): not implemented");
808    return NULL;
809}
810