ftp.c revision 60737 
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 60737 2000-05-20 18:23:51Z ume $
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    /* change directory */
222    if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
223	*s = 0;
224	if (verbose)
225	    _fetch_info("changing directory to %s", file);
226	if ((e = _ftp_cmd(cd, "CWD %s", file)) != FTP_FILE_ACTION_OK) {
227	    *s = '/';
228	    if (e != -1)
229		_ftp_seterr(e);
230	    return NULL;
231	}
232	*s++ = '/';
233    } else {
234	if (verbose)
235	    _fetch_info("changing directory to /");
236	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK) {
237	    if (e != -1)
238		_ftp_seterr(e);
239	    return NULL;
240	}
241    }
242
243    /* s now points to file name */
244
245    /* find our own address, bind, and listen */
246    l = sizeof sin;
247    if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
248	goto sysouch;
249    if (sin.ss_family == AF_INET6)
250	unmappedaddr((struct sockaddr_in6 *)&sin);
251
252    /* open data socket */
253    if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
254	_fetch_syserr();
255	return NULL;
256    }
257
258    if (pasv) {
259	u_char addr[64];
260	char *ln, *p;
261	int i;
262	int port;
263
264	/* send PASV command */
265	if (verbose)
266	    _fetch_info("setting passive mode");
267	switch (sin.ss_family) {
268	case AF_INET:
269	    if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
270		goto ouch;
271	    break;
272	case AF_INET6:
273	    if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
274		if (e == -1)
275		    goto ouch;
276		if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
277		    goto ouch;
278	    }
279	    break;
280	default:
281	    e = 999;		/* XXX: error code should be prepared */
282	    goto ouch;
283	}
284
285	/*
286	 * Find address and port number. The reply to the PASV command
287         * is IMHO the one and only weak point in the FTP protocol.
288	 */
289	ln = last_reply;
290	for (p = ln + 3; *p && *p != '('; p++)
291	    /* nothing */ ;
292	if (!*p) {
293	    e = 999;
294	    goto ouch;
295	}
296	p++;
297	switch (e) {
298	case FTP_PASSIVE_MODE:
299	case FTP_LPASSIVE_MODE:
300	    l = (e == FTP_PASSIVE_MODE ? 6 : 21);
301	    for (i = 0; *p && i < l; i++, p++)
302		addr[i] = strtol(p, &p, 10);
303	    if (i < l) {
304		e = 999;
305		goto ouch;
306	    }
307	    break;
308	case FTP_EPASSIVE_MODE:
309	    if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
310		       &port, &addr[3]) != 5 ||
311		addr[0] != addr[1] ||
312		addr[0] != addr[2] || addr[0] != addr[3]) {
313		e = 999;
314		goto ouch;
315	    }
316	    break;
317	}
318
319	/* seek to required offset */
320	if (offset)
321	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
322		goto sysouch;
323
324	/* construct sockaddr for data socket */
325	l = sizeof sin;
326	if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
327	    goto sysouch;
328	if (sin.ss_family == AF_INET6)
329	    unmappedaddr((struct sockaddr_in6 *)&sin);
330	switch (sin.ss_family) {
331	case AF_INET6:
332	    sin6 = (struct sockaddr_in6 *)&sin;
333	    if (e == FTP_EPASSIVE_MODE)
334		sin6->sin6_port = htons(port);
335	    else {
336		bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
337		bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
338	    }
339	    break;
340	case AF_INET:
341	    sin4 = (struct sockaddr_in *)&sin;
342	    if (e == FTP_EPASSIVE_MODE)
343		sin4->sin_port = htons(port);
344	    else {
345		bcopy(addr, (char *)&sin4->sin_addr, 4);
346		bcopy(addr + 4, (char *)&sin4->sin_port, 2);
347	    }
348	    break;
349	default:
350	    e = 999;		/* XXX: error code should be prepared */
351	    break;
352	}
353
354	/* connect to data port */
355	if (verbose)
356	    _fetch_info("opening data connection");
357	if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
358	    goto sysouch;
359
360	/* make the server initiate the transfer */
361	if (verbose)
362	    _fetch_info("initiating transfer");
363	e = _ftp_cmd(cd, "%s %s", oper, s);
364	if (e != FTP_OPEN_DATA_CONNECTION)
365	    goto ouch;
366
367    } else {
368	u_int32_t a;
369	u_short p;
370	int arg, d;
371	char *ap;
372	char hname[INET6_ADDRSTRLEN];
373
374	switch (sin.ss_family) {
375	case AF_INET6:
376	    ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
377#ifdef IPV6_PORTRANGE
378	    arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
379	    if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
380			   (char *)&arg, sizeof(arg)) == -1)
381		goto sysouch;
382#endif
383	    break;
384	case AF_INET:
385	    ((struct sockaddr_in *)&sin)->sin_port = 0;
386	    arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
387	    if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
388			   (char *)&arg, sizeof arg) == -1)
389		goto sysouch;
390	    break;
391	}
392	if (verbose)
393	    _fetch_info("binding data socket");
394	if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
395	    goto sysouch;
396	if (listen(sd, 1) == -1)
397	    goto sysouch;
398
399	/* find what port we're on and tell the server */
400	if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
401	    goto sysouch;
402	switch (sin.ss_family) {
403	case AF_INET:
404	    sin4 = (struct sockaddr_in *)&sin;
405	    a = ntohl(sin4->sin_addr.s_addr);
406	    p = ntohs(sin4->sin_port);
407	    e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
408			 (a >> 24) & 0xff, (a >> 16) & 0xff,
409			 (a >> 8) & 0xff, a & 0xff,
410			 (p >> 8) & 0xff, p & 0xff);
411	    break;
412	case AF_INET6:
413#define UC(b)	(((int)b)&0xff)
414	    e = -1;
415	    sin6 = (struct sockaddr_in6 *)&sin;
416	    if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
417			    hname, sizeof(hname),
418			    NULL, 0, NI_NUMERICHOST) == 0) {
419		e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
420			     htons(sin6->sin6_port));
421		if (e == -1)
422		    goto ouch;
423	    }
424	    if (e != FTP_OK) {
425		ap = (char *)&sin6->sin6_addr;
426		e = _ftp_cmd(cd,
427     "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
428			     6, 16,
429			     UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
430			     UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
431			     UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
432			     UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
433			     2,
434			     (ntohs(sin6->sin6_port) >> 8) & 0xff,
435			     ntohs(sin6->sin6_port)        & 0xff);
436	    }
437	    break;
438	default:
439	    e = 999;		/* XXX: error code should be prepared */
440	    goto ouch;
441	}
442	if (e != FTP_OK)
443	    goto ouch;
444
445	/* make the server initiate the transfer */
446	if (verbose)
447	    _fetch_info("initiating transfer");
448	e = _ftp_cmd(cd, "%s %s", oper, s);
449	if (e != FTP_OPEN_DATA_CONNECTION)
450	    goto ouch;
451
452	/* accept the incoming connection and go to town */
453	if ((d = accept(sd, NULL, NULL)) == -1)
454	    goto sysouch;
455	close(sd);
456	sd = d;
457    }
458
459    if ((df = fdopen(sd, mode)) == NULL)
460	goto sysouch;
461    return df;
462
463sysouch:
464    _fetch_syserr();
465    if (sd >= 0)
466	close(sd);
467    return NULL;
468
469ouch:
470    if (e != -1)
471	_ftp_seterr(e);
472    if (sd >= 0)
473	close(sd);
474    return NULL;
475}
476
477/*
478 * Log on to FTP server
479 */
480static int
481_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
482{
483    int cd, e, pp = 0, direct, verbose;
484#ifdef INET6
485    int af = AF_UNSPEC;
486#else
487    int af = AF_INET;
488#endif
489    char *p, *q;
490
491    direct = (flags && strchr(flags, 'd'));
492    verbose = (flags && strchr(flags, 'v'));
493    if ((flags && strchr(flags, '4')))
494	af = AF_INET;
495    else if ((flags && strchr(flags, '6')))
496	af = AF_INET6;
497
498    /* check for proxy */
499    if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
500	char c = 0;
501
502#ifdef INET6
503	if (*p != '[' || (q = strchr(p + 1, ']')) == NULL ||
504	    (*++q != '\0' && *q != ':'))
505#endif
506	    q = strchr(p, ':');
507	if (q != NULL && *q == ':') {
508	    if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) {
509		/* XXX we should emit some kind of warning */
510	    }
511	    pp = atoi(q+1);
512	    if (pp < 1 || pp > 65535) {
513		/* XXX we should emit some kind of warning */
514	    }
515	}
516	if (!pp) {
517	    struct servent *se;
518
519	    if ((se = getservbyname("ftp", "tcp")) != NULL)
520		pp = ntohs(se->s_port);
521	    else
522		pp = FTP_DEFAULT_PORT;
523	}
524	if (q) {
525#ifdef INET6
526	    if (q > p && *p == '[' && *(q - 1) == ']') {
527		p++;
528		q--;
529	    }
530#endif
531	    c = *q;
532	    *q = 0;
533	}
534	cd = _fetch_connect(p, pp, af, verbose);
535	if (q)
536	    *q = c;
537    } else {
538	/* no proxy, go straight to target */
539	cd = _fetch_connect(host, port, af, verbose);
540	p = NULL;
541    }
542
543    /* check connection */
544    if (cd == -1) {
545	_fetch_syserr();
546	return NULL;
547    }
548
549    /* expect welcome message */
550    if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
551	goto fouch;
552
553    /* send user name and password */
554    if (!user || !*user)
555	user = FTP_ANONYMOUS_USER;
556    e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
557	  : _ftp_cmd(cd, "USER %s", user);
558
559    /* did the server request a password? */
560    if (e == FTP_NEED_PASSWORD) {
561	if (!pwd || !*pwd)
562	    pwd = FTP_ANONYMOUS_PASSWORD;
563	e = _ftp_cmd(cd, "PASS %s", pwd);
564    }
565
566    /* did the server request an account? */
567    if (e == FTP_NEED_ACCOUNT)
568	goto fouch;
569
570    /* we should be done by now */
571    if (e != FTP_LOGGED_IN)
572	goto fouch;
573
574    /* might as well select mode and type at once */
575#ifdef FTP_FORCE_STREAM_MODE
576    if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
577	goto fouch;
578#endif
579    if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
580	goto fouch;
581
582    /* done */
583    return cd;
584
585fouch:
586    if (e != -1)
587	_ftp_seterr(e);
588    close(cd);
589    return NULL;
590}
591
592/*
593 * Disconnect from server
594 */
595static void
596_ftp_disconnect(int cd)
597{
598    (void)_ftp_cmd(cd, "QUIT");
599    close(cd);
600}
601
602/*
603 * Check if we're already connected
604 */
605static int
606_ftp_isconnected(struct url *url)
607{
608    return (cached_socket
609	    && (strcmp(url->host, cached_host.host) == 0)
610	    && (strcmp(url->user, cached_host.user) == 0)
611	    && (strcmp(url->pwd, cached_host.pwd) == 0)
612	    && (url->port == cached_host.port));
613}
614
615/*
616 * Check the cache, reconnect if no luck
617 */
618static int
619_ftp_cached_connect(struct url *url, char *flags)
620{
621    int e, cd;
622
623    cd = -1;
624
625    /* set default port */
626    if (!url->port) {
627	struct servent *se;
628
629	if ((se = getservbyname("ftp", "tcp")) != NULL)
630	    url->port = ntohs(se->s_port);
631	else
632	    url->port = FTP_DEFAULT_PORT;
633    }
634
635    /* try to use previously cached connection */
636    if (_ftp_isconnected(url)) {
637	e = _ftp_cmd(cached_socket, "NOOP");
638	if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
639	    cd = cached_socket;
640    }
641
642    /* connect to server */
643    if (cd == -1) {
644	cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
645	if (cd == -1)
646	    return -1;
647	if (cached_socket)
648	    _ftp_disconnect(cached_socket);
649	cached_socket = cd;
650	memcpy(&cached_host, url, sizeof *url);
651    }
652
653    return cd;
654}
655
656/*
657 * Get file
658 */
659FILE *
660fetchGetFTP(struct url *url, char *flags)
661{
662    int cd;
663
664    /* connect to server */
665    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
666	return NULL;
667
668    /* initiate the transfer */
669    return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags);
670}
671
672/*
673 * Put file
674 */
675FILE *
676fetchPutFTP(struct url *url, char *flags)
677{
678    int cd;
679
680    /* connect to server */
681    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
682	return NULL;
683
684    /* initiate the transfer */
685    return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
686			 url->doc, "w", url->offset, flags);
687}
688
689/*
690 * Get file stats
691 */
692int
693fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
694{
695    char *ln, *s;
696    struct tm tm;
697    time_t t;
698    int e, cd;
699
700    us->size = -1;
701    us->atime = us->mtime = 0;
702
703    /* connect to server */
704    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
705	return -1;
706
707    /* change directory */
708    if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
709	*s = 0;
710	if ((e = _ftp_cmd(cd, "CWD %s", url->doc)) != FTP_FILE_ACTION_OK) {
711	    *s = '/';
712	    goto ouch;
713	}
714	*s++ = '/';
715    } else {
716	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK)
717	    goto ouch;
718    }
719
720    /* s now points to file name */
721
722    if (_ftp_cmd(cd, "SIZE %s", s) != FTP_FILE_STATUS)
723	goto ouch;
724    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
725	/* nothing */ ;
726    for (us->size = 0; *ln && isdigit(*ln); ln++)
727	us->size = us->size * 10 + *ln - '0';
728    if (*ln && !isspace(*ln)) {
729	_ftp_seterr(999);
730	return -1;
731    }
732    DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
733
734    if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS)
735	goto ouch;
736    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
737	/* nothing */ ;
738    e = 999;
739    switch (strspn(ln, "0123456789")) {
740    case 14:
741	break;
742    case 15:
743	ln++;
744	ln[0] = '2';
745	ln[1] = '0';
746	break;
747    default:
748	goto ouch;
749    }
750    if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
751	       &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
752	       &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
753	goto ouch;
754    tm.tm_mon--;
755    tm.tm_year -= 1900;
756    tm.tm_isdst = -1;
757    t = timegm(&tm);
758    if (t == (time_t)-1)
759	t = time(NULL);
760    us->mtime = t;
761    us->atime = t;
762    DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
763		  "%02d:%02d:%02d\033[m]\n",
764		  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
765		  tm.tm_hour, tm.tm_min, tm.tm_sec));
766    return 0;
767
768ouch:
769    if (e != -1)
770	_ftp_seterr(e);
771    return -1;
772}
773
774/*
775 * List a directory
776 */
777extern void warnx(char *, ...);
778struct url_ent *
779fetchListFTP(struct url *url, char *flags)
780{
781    warnx("fetchListFTP(): not implemented");
782    return NULL;
783}
784