ftp.c revision 61866 
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 61866 2000-06-20 13:57:00Z 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    do {
138	if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
139	    _fetch_syserr();
140	    return -1;
141	}
142#ifndef NDEBUG
143	_fetch_info("got reply '%.*s'", lr_length - 2, last_reply);
144#endif
145    } while (isftpinfo(last_reply));
146
147    while (lr_length && isspace(last_reply[lr_length-1]))
148	lr_length--;
149    last_reply[lr_length] = 0;
150
151    if (!isftpreply(last_reply)) {
152	_ftp_seterr(999);
153	return -1;
154    }
155
156    last_code = (last_reply[0] - '0') * 100
157	+ (last_reply[1] - '0') * 10
158	+ (last_reply[2] - '0');
159
160    return last_code;
161}
162
163/*
164 * Send a command and check reply
165 */
166static int
167_ftp_cmd(int cd, char *fmt, ...)
168{
169    va_list ap;
170    struct iovec iov[2];
171    char *msg;
172    int r;
173
174    va_start(ap, fmt);
175    vasprintf(&msg, fmt, ap);
176    va_end(ap);
177
178    if (msg == NULL) {
179	errno = ENOMEM;
180	_fetch_syserr();
181	return -1;
182    }
183#ifndef NDEBUG
184    _fetch_info("sending '%s'", msg);
185#endif
186    iov[0].iov_base = msg;
187    iov[0].iov_len = strlen(msg);
188    iov[1].iov_base = ENDL;
189    iov[1].iov_len = sizeof ENDL;
190    r = writev(cd, iov, 2);
191    free(msg);
192    if (r == -1) {
193	_fetch_syserr();
194	return -1;
195    }
196
197    return _ftp_chkerr(cd);
198}
199
200/*
201 * Transfer file
202 */
203static FILE *
204_ftp_transfer(int cd, char *oper, char *file,
205	      char *mode, off_t offset, char *flags)
206{
207    struct sockaddr_storage sin;
208    struct sockaddr_in6 *sin6;
209    struct sockaddr_in *sin4;
210    int pasv, high, verbose;
211    int e, sd = -1;
212    socklen_t l;
213    char *s;
214    FILE *df;
215
216    /* check flags */
217    pasv = (flags && strchr(flags, 'p'));
218    high = (flags && strchr(flags, 'h'));
219    verbose = (flags && strchr(flags, 'v'));
220
221    /* passive mode */
222    if (!pasv && (s = getenv("FTP_PASSIVE_MODE")) != NULL)
223	pasv = (strncasecmp(s, "no", 2) != 0);
224
225    /* change directory */
226    if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
227	*s = 0;
228	if (verbose)
229	    _fetch_info("changing directory to %s", file);
230	if ((e = _ftp_cmd(cd, "CWD %s", file)) != FTP_FILE_ACTION_OK) {
231	    *s = '/';
232	    if (e != -1)
233		_ftp_seterr(e);
234	    return NULL;
235	}
236	*s++ = '/';
237    } else {
238	if (verbose)
239	    _fetch_info("changing directory to /");
240	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK) {
241	    if (e != -1)
242		_ftp_seterr(e);
243	    return NULL;
244	}
245    }
246
247    /* s now points to file name */
248
249    /* find our own address, bind, and listen */
250    l = sizeof sin;
251    if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
252	goto sysouch;
253    if (sin.ss_family == AF_INET6)
254	unmappedaddr((struct sockaddr_in6 *)&sin);
255
256    /* open data socket */
257    if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
258	_fetch_syserr();
259	return NULL;
260    }
261
262    if (pasv) {
263	u_char addr[64];
264	char *ln, *p;
265	int i;
266	int port;
267
268	/* send PASV command */
269	if (verbose)
270	    _fetch_info("setting passive mode");
271	switch (sin.ss_family) {
272	case AF_INET:
273	    if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
274		goto ouch;
275	    break;
276	case AF_INET6:
277	    if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
278		if (e == -1)
279		    goto ouch;
280		if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
281		    goto ouch;
282	    }
283	    break;
284	default:
285	    e = 999;		/* XXX: error code should be prepared */
286	    goto ouch;
287	}
288
289	/*
290	 * Find address and port number. The reply to the PASV command
291         * is IMHO the one and only weak point in the FTP protocol.
292	 */
293	ln = last_reply;
294	for (p = ln + 3; *p && *p != '('; p++)
295	    /* nothing */ ;
296	if (!*p) {
297	    e = 999;
298	    goto ouch;
299	}
300	p++;
301	switch (e) {
302	case FTP_PASSIVE_MODE:
303	case FTP_LPASSIVE_MODE:
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	    if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
314		       &port, &addr[3]) != 5 ||
315		addr[0] != addr[1] ||
316		addr[0] != addr[2] || addr[0] != addr[3]) {
317		e = 999;
318		goto ouch;
319	    }
320	    break;
321	}
322
323	/* seek to required offset */
324	if (offset)
325	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
326		goto sysouch;
327
328	/* construct sockaddr for data socket */
329	l = sizeof sin;
330	if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
331	    goto sysouch;
332	if (sin.ss_family == AF_INET6)
333	    unmappedaddr((struct sockaddr_in6 *)&sin);
334	switch (sin.ss_family) {
335	case AF_INET6:
336	    sin6 = (struct sockaddr_in6 *)&sin;
337	    if (e == FTP_EPASSIVE_MODE)
338		sin6->sin6_port = htons(port);
339	    else {
340		bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
341		bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
342	    }
343	    break;
344	case AF_INET:
345	    sin4 = (struct sockaddr_in *)&sin;
346	    if (e == FTP_EPASSIVE_MODE)
347		sin4->sin_port = htons(port);
348	    else {
349		bcopy(addr, (char *)&sin4->sin_addr, 4);
350		bcopy(addr + 4, (char *)&sin4->sin_port, 2);
351	    }
352	    break;
353	default:
354	    e = 999;		/* XXX: error code should be prepared */
355	    break;
356	}
357
358	/* connect to data port */
359	if (verbose)
360	    _fetch_info("opening data connection");
361	if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
362	    goto sysouch;
363
364	/* make the server initiate the transfer */
365	if (verbose)
366	    _fetch_info("initiating transfer");
367	e = _ftp_cmd(cd, "%s %s", oper, s);
368	if (e != FTP_OPEN_DATA_CONNECTION)
369	    goto ouch;
370
371    } else {
372	u_int32_t a;
373	u_short p;
374	int arg, d;
375	char *ap;
376	char hname[INET6_ADDRSTRLEN];
377
378	switch (sin.ss_family) {
379	case AF_INET6:
380	    ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
381#ifdef IPV6_PORTRANGE
382	    arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
383	    if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
384			   (char *)&arg, sizeof(arg)) == -1)
385		goto sysouch;
386#endif
387	    break;
388	case AF_INET:
389	    ((struct sockaddr_in *)&sin)->sin_port = 0;
390	    arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
391	    if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
392			   (char *)&arg, sizeof arg) == -1)
393		goto sysouch;
394	    break;
395	}
396	if (verbose)
397	    _fetch_info("binding data socket");
398	if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
399	    goto sysouch;
400	if (listen(sd, 1) == -1)
401	    goto sysouch;
402
403	/* find what port we're on and tell the server */
404	if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
405	    goto sysouch;
406	switch (sin.ss_family) {
407	case AF_INET:
408	    sin4 = (struct sockaddr_in *)&sin;
409	    a = ntohl(sin4->sin_addr.s_addr);
410	    p = ntohs(sin4->sin_port);
411	    e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
412			 (a >> 24) & 0xff, (a >> 16) & 0xff,
413			 (a >> 8) & 0xff, a & 0xff,
414			 (p >> 8) & 0xff, p & 0xff);
415	    break;
416	case AF_INET6:
417#define UC(b)	(((int)b)&0xff)
418	    e = -1;
419	    sin6 = (struct sockaddr_in6 *)&sin;
420	    if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
421			    hname, sizeof(hname),
422			    NULL, 0, NI_NUMERICHOST) == 0) {
423		e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
424			     htons(sin6->sin6_port));
425		if (e == -1)
426		    goto ouch;
427	    }
428	    if (e != FTP_OK) {
429		ap = (char *)&sin6->sin6_addr;
430		e = _ftp_cmd(cd,
431     "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
432			     6, 16,
433			     UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
434			     UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
435			     UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
436			     UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
437			     2,
438			     (ntohs(sin6->sin6_port) >> 8) & 0xff,
439			     ntohs(sin6->sin6_port)        & 0xff);
440	    }
441	    break;
442	default:
443	    e = 999;		/* XXX: error code should be prepared */
444	    goto ouch;
445	}
446	if (e != FTP_OK)
447	    goto ouch;
448
449	/* make the server initiate the transfer */
450	if (verbose)
451	    _fetch_info("initiating transfer");
452	e = _ftp_cmd(cd, "%s %s", oper, s);
453	if (e != FTP_OPEN_DATA_CONNECTION)
454	    goto ouch;
455
456	/* accept the incoming connection and go to town */
457	if ((d = accept(sd, NULL, NULL)) == -1)
458	    goto sysouch;
459	close(sd);
460	sd = d;
461    }
462
463    if ((df = fdopen(sd, mode)) == NULL)
464	goto sysouch;
465    return df;
466
467sysouch:
468    _fetch_syserr();
469    if (sd >= 0)
470	close(sd);
471    return NULL;
472
473ouch:
474    if (e != -1)
475	_ftp_seterr(e);
476    if (sd >= 0)
477	close(sd);
478    return NULL;
479}
480
481/*
482 * Log on to FTP server
483 */
484static int
485_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
486{
487    int cd, e, pp = 0, direct, verbose;
488#ifdef INET6
489    int af = AF_UNSPEC;
490#else
491    int af = AF_INET;
492#endif
493    char *p, *q;
494    const char *logname;
495    char localhost[MAXHOSTNAMELEN];
496    char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
497
498    direct = (flags && strchr(flags, 'd'));
499    verbose = (flags && strchr(flags, 'v'));
500    if ((flags && strchr(flags, '4')))
501	af = AF_INET;
502    else if ((flags && strchr(flags, '6')))
503	af = AF_INET6;
504
505    /* check for proxy */
506    if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
507	char c = 0;
508
509#ifdef INET6
510	if (*p != '[' || (q = strchr(p + 1, ']')) == NULL ||
511	    (*++q != '\0' && *q != ':'))
512#endif
513	    q = strchr(p, ':');
514	if (q != NULL && *q == ':') {
515	    if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) {
516		/* XXX we should emit some kind of warning */
517	    }
518	    pp = atoi(q+1);
519	    if (pp < 1 || pp > 65535) {
520		/* XXX we should emit some kind of warning */
521	    }
522	}
523	if (!pp) {
524	    struct servent *se;
525
526	    if ((se = getservbyname("ftp", "tcp")) != NULL)
527		pp = ntohs(se->s_port);
528	    else
529		pp = FTP_DEFAULT_PORT;
530	}
531	if (q) {
532#ifdef INET6
533	    if (q > p && *p == '[' && *(q - 1) == ']') {
534		p++;
535		q--;
536	    }
537#endif
538	    c = *q;
539	    *q = 0;
540	}
541	cd = _fetch_connect(p, pp, af, verbose);
542	if (q)
543	    *q = c;
544    } else {
545	/* no proxy, go straight to target */
546	cd = _fetch_connect(host, port, af, verbose);
547	p = NULL;
548    }
549
550    /* check connection */
551    if (cd == -1) {
552	_fetch_syserr();
553	return NULL;
554    }
555
556    /* expect welcome message */
557    if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
558	goto fouch;
559
560    /* send user name and password */
561    if (!user || !*user)
562	user = FTP_ANONYMOUS_USER;
563    e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
564	  : _ftp_cmd(cd, "USER %s", user);
565
566    /* did the server request a password? */
567    if (e == FTP_NEED_PASSWORD) {
568	if (!pwd || !*pwd)
569	    pwd = getenv("FTP_PASSWORD");
570	if (!pwd || !*pwd) {
571	    if ((logname = getlogin()) == 0)
572		logname = FTP_ANONYMOUS_PASSWORD;
573	    gethostname(localhost, sizeof localhost);
574	    snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost);
575	    pwd = pbuf;
576	}
577	e = _ftp_cmd(cd, "PASS %s", pwd);
578    }
579
580    /* did the server request an account? */
581    if (e == FTP_NEED_ACCOUNT)
582	goto fouch;
583
584    /* we should be done by now */
585    if (e != FTP_LOGGED_IN)
586	goto fouch;
587
588    /* might as well select mode and type at once */
589#ifdef FTP_FORCE_STREAM_MODE
590    if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
591	goto fouch;
592#endif
593    if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
594	goto fouch;
595
596    /* done */
597    return cd;
598
599fouch:
600    if (e != -1)
601	_ftp_seterr(e);
602    close(cd);
603    return NULL;
604}
605
606/*
607 * Disconnect from server
608 */
609static void
610_ftp_disconnect(int cd)
611{
612    (void)_ftp_cmd(cd, "QUIT");
613    close(cd);
614}
615
616/*
617 * Check if we're already connected
618 */
619static int
620_ftp_isconnected(struct url *url)
621{
622    return (cached_socket
623	    && (strcmp(url->host, cached_host.host) == 0)
624	    && (strcmp(url->user, cached_host.user) == 0)
625	    && (strcmp(url->pwd, cached_host.pwd) == 0)
626	    && (url->port == cached_host.port));
627}
628
629/*
630 * Check the cache, reconnect if no luck
631 */
632static int
633_ftp_cached_connect(struct url *url, char *flags)
634{
635    int e, cd;
636
637    cd = -1;
638
639    /* set default port */
640    if (!url->port) {
641	struct servent *se;
642
643	if ((se = getservbyname("ftp", "tcp")) != NULL)
644	    url->port = ntohs(se->s_port);
645	else
646	    url->port = FTP_DEFAULT_PORT;
647    }
648
649    /* try to use previously cached connection */
650    if (_ftp_isconnected(url)) {
651	e = _ftp_cmd(cached_socket, "NOOP");
652	if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
653	    cd = cached_socket;
654    }
655
656    /* connect to server */
657    if (cd == -1) {
658	cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
659	if (cd == -1)
660	    return -1;
661	if (cached_socket)
662	    _ftp_disconnect(cached_socket);
663	cached_socket = cd;
664	memcpy(&cached_host, url, sizeof *url);
665    }
666
667    return cd;
668}
669
670/*
671 * Get file
672 */
673FILE *
674fetchGetFTP(struct url *url, char *flags)
675{
676    int cd;
677
678    /* connect to server */
679    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
680	return NULL;
681
682    /* initiate the transfer */
683    return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags);
684}
685
686/*
687 * Put file
688 */
689FILE *
690fetchPutFTP(struct url *url, char *flags)
691{
692    int cd;
693
694    /* connect to server */
695    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
696	return NULL;
697
698    /* initiate the transfer */
699    return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
700			 url->doc, "w", url->offset, flags);
701}
702
703/*
704 * Get file stats
705 */
706int
707fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
708{
709    char *ln, *s;
710    struct tm tm;
711    time_t t;
712    int e, cd;
713
714    us->size = -1;
715    us->atime = us->mtime = 0;
716
717    /* connect to server */
718    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
719	return -1;
720
721    /* change directory */
722    if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
723	*s = 0;
724	if ((e = _ftp_cmd(cd, "CWD %s", url->doc)) != FTP_FILE_ACTION_OK) {
725	    *s = '/';
726	    goto ouch;
727	}
728	*s++ = '/';
729    } else {
730	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK)
731	    goto ouch;
732    }
733
734    /* s now points to file name */
735
736    if (_ftp_cmd(cd, "SIZE %s", s) != FTP_FILE_STATUS)
737	goto ouch;
738    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
739	/* nothing */ ;
740    for (us->size = 0; *ln && isdigit(*ln); ln++)
741	us->size = us->size * 10 + *ln - '0';
742    if (*ln && !isspace(*ln)) {
743	_ftp_seterr(999);
744	return -1;
745    }
746    DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
747
748    if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS)
749	goto ouch;
750    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
751	/* nothing */ ;
752    e = 999;
753    switch (strspn(ln, "0123456789")) {
754    case 14:
755	break;
756    case 15:
757	ln++;
758	ln[0] = '2';
759	ln[1] = '0';
760	break;
761    default:
762	goto ouch;
763    }
764    if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
765	       &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
766	       &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
767	goto ouch;
768    tm.tm_mon--;
769    tm.tm_year -= 1900;
770    tm.tm_isdst = -1;
771    t = timegm(&tm);
772    if (t == (time_t)-1)
773	t = time(NULL);
774    us->mtime = t;
775    us->atime = t;
776    DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
777		  "%02d:%02d:%02d\033[m]\n",
778		  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
779		  tm.tm_hour, tm.tm_min, tm.tm_sec));
780    return 0;
781
782ouch:
783    if (e != -1)
784	_ftp_seterr(e);
785    return -1;
786}
787
788/*
789 * List a directory
790 */
791extern void warnx(char *, ...);
792struct url_ent *
793fetchListFTP(struct url *url, char *flags)
794{
795    warnx("fetchListFTP(): not implemented");
796    return NULL;
797}
798