ftp.c revision 62256 
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 62256 2000-06-29 10:44:10Z 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#ifndef NDEBUG
142    _fetch_info("got reply '%.*s'", lr_length - 2, last_reply);
143#endif
144    if (isftpinfo(last_reply)) {
145	while (!isftpreply(last_reply)) {
146	    if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
147		_fetch_syserr();
148		return -1;
149	    }
150#ifndef NDEBUG
151	    _fetch_info("got reply '%.*s'", lr_length - 2, last_reply);
152#endif
153	}
154    }
155
156    while (lr_length && isspace(last_reply[lr_length-1]))
157	lr_length--;
158    last_reply[lr_length] = 0;
159
160    if (!isftpreply(last_reply)) {
161	_ftp_seterr(999);
162	return -1;
163    }
164
165    last_code = (last_reply[0] - '0') * 100
166	+ (last_reply[1] - '0') * 10
167	+ (last_reply[2] - '0');
168
169    return last_code;
170}
171
172/*
173 * Send a command and check reply
174 */
175static int
176_ftp_cmd(int cd, char *fmt, ...)
177{
178    va_list ap;
179    struct iovec iov[2];
180    char *msg;
181    int r;
182
183    va_start(ap, fmt);
184    vasprintf(&msg, fmt, ap);
185    va_end(ap);
186
187    if (msg == NULL) {
188	errno = ENOMEM;
189	_fetch_syserr();
190	return -1;
191    }
192#ifndef NDEBUG
193    _fetch_info("sending '%s'", msg);
194#endif
195    iov[0].iov_base = msg;
196    iov[0].iov_len = strlen(msg);
197    iov[1].iov_base = ENDL;
198    iov[1].iov_len = sizeof ENDL;
199    r = writev(cd, iov, 2);
200    free(msg);
201    if (r == -1) {
202	_fetch_syserr();
203	return -1;
204    }
205
206    return _ftp_chkerr(cd);
207}
208
209/*
210 * Transfer file
211 */
212static FILE *
213_ftp_transfer(int cd, char *oper, char *file,
214	      char *mode, off_t offset, char *flags)
215{
216    struct sockaddr_storage sin;
217    struct sockaddr_in6 *sin6;
218    struct sockaddr_in *sin4;
219    int pasv, high, verbose;
220    int e, sd = -1;
221    socklen_t l;
222    char *s;
223    FILE *df;
224
225    /* check flags */
226    pasv = (flags && strchr(flags, 'p'));
227    high = (flags && strchr(flags, 'h'));
228    verbose = (flags && strchr(flags, 'v'));
229
230    /* passive mode */
231    if (!pasv && (s = getenv("FTP_PASSIVE_MODE")) != NULL)
232	pasv = (strncasecmp(s, "no", 2) != 0);
233
234    /* change directory */
235    if (((s = strrchr(file, '/')) != NULL) && (s != file)) {
236	*s = 0;
237	if (verbose)
238	    _fetch_info("changing directory to %s", file);
239	if ((e = _ftp_cmd(cd, "CWD %s", file)) != FTP_FILE_ACTION_OK) {
240	    *s = '/';
241	    if (e != -1)
242		_ftp_seterr(e);
243	    return NULL;
244	}
245	*s++ = '/';
246    } else {
247	if (verbose)
248	    _fetch_info("changing directory to /");
249	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK) {
250	    if (e != -1)
251		_ftp_seterr(e);
252	    return NULL;
253	}
254    }
255
256    /* s now points to file name */
257
258    /* find our own address, bind, and listen */
259    l = sizeof sin;
260    if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
261	goto sysouch;
262    if (sin.ss_family == AF_INET6)
263	unmappedaddr((struct sockaddr_in6 *)&sin);
264
265    /* open data socket */
266    if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
267	_fetch_syserr();
268	return NULL;
269    }
270
271    if (pasv) {
272	u_char addr[64];
273	char *ln, *p;
274	int i;
275	int port;
276
277	/* send PASV command */
278	if (verbose)
279	    _fetch_info("setting passive mode");
280	switch (sin.ss_family) {
281	case AF_INET:
282	    if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
283		goto ouch;
284	    break;
285	case AF_INET6:
286	    if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
287		if (e == -1)
288		    goto ouch;
289		if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
290		    goto ouch;
291	    }
292	    break;
293	default:
294	    e = 999;		/* XXX: error code should be prepared */
295	    goto ouch;
296	}
297
298	/*
299	 * Find address and port number. The reply to the PASV command
300         * is IMHO the one and only weak point in the FTP protocol.
301	 */
302	ln = last_reply;
303	for (p = ln + 3; *p && *p != '('; p++)
304	    /* nothing */ ;
305	if (!*p) {
306	    e = 999;
307	    goto ouch;
308	}
309	p++;
310	switch (e) {
311	case FTP_PASSIVE_MODE:
312	case FTP_LPASSIVE_MODE:
313	    l = (e == FTP_PASSIVE_MODE ? 6 : 21);
314	    for (i = 0; *p && i < l; i++, p++)
315		addr[i] = strtol(p, &p, 10);
316	    if (i < l) {
317		e = 999;
318		goto ouch;
319	    }
320	    break;
321	case FTP_EPASSIVE_MODE:
322	    if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
323		       &port, &addr[3]) != 5 ||
324		addr[0] != addr[1] ||
325		addr[0] != addr[2] || addr[0] != addr[3]) {
326		e = 999;
327		goto ouch;
328	    }
329	    break;
330	}
331
332	/* seek to required offset */
333	if (offset)
334	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
335		goto sysouch;
336
337	/* construct sockaddr for data socket */
338	l = sizeof sin;
339	if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
340	    goto sysouch;
341	if (sin.ss_family == AF_INET6)
342	    unmappedaddr((struct sockaddr_in6 *)&sin);
343	switch (sin.ss_family) {
344	case AF_INET6:
345	    sin6 = (struct sockaddr_in6 *)&sin;
346	    if (e == FTP_EPASSIVE_MODE)
347		sin6->sin6_port = htons(port);
348	    else {
349		bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
350		bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
351	    }
352	    break;
353	case AF_INET:
354	    sin4 = (struct sockaddr_in *)&sin;
355	    if (e == FTP_EPASSIVE_MODE)
356		sin4->sin_port = htons(port);
357	    else {
358		bcopy(addr, (char *)&sin4->sin_addr, 4);
359		bcopy(addr + 4, (char *)&sin4->sin_port, 2);
360	    }
361	    break;
362	default:
363	    e = 999;		/* XXX: error code should be prepared */
364	    break;
365	}
366
367	/* connect to data port */
368	if (verbose)
369	    _fetch_info("opening data connection");
370	if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
371	    goto sysouch;
372
373	/* make the server initiate the transfer */
374	if (verbose)
375	    _fetch_info("initiating transfer");
376	e = _ftp_cmd(cd, "%s %s", oper, s);
377	if (e != FTP_OPEN_DATA_CONNECTION)
378	    goto ouch;
379
380    } else {
381	u_int32_t a;
382	u_short p;
383	int arg, d;
384	char *ap;
385	char hname[INET6_ADDRSTRLEN];
386
387	switch (sin.ss_family) {
388	case AF_INET6:
389	    ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
390#ifdef IPV6_PORTRANGE
391	    arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
392	    if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
393			   (char *)&arg, sizeof(arg)) == -1)
394		goto sysouch;
395#endif
396	    break;
397	case AF_INET:
398	    ((struct sockaddr_in *)&sin)->sin_port = 0;
399	    arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
400	    if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
401			   (char *)&arg, sizeof arg) == -1)
402		goto sysouch;
403	    break;
404	}
405	if (verbose)
406	    _fetch_info("binding data socket");
407	if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
408	    goto sysouch;
409	if (listen(sd, 1) == -1)
410	    goto sysouch;
411
412	/* find what port we're on and tell the server */
413	if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
414	    goto sysouch;
415	switch (sin.ss_family) {
416	case AF_INET:
417	    sin4 = (struct sockaddr_in *)&sin;
418	    a = ntohl(sin4->sin_addr.s_addr);
419	    p = ntohs(sin4->sin_port);
420	    e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
421			 (a >> 24) & 0xff, (a >> 16) & 0xff,
422			 (a >> 8) & 0xff, a & 0xff,
423			 (p >> 8) & 0xff, p & 0xff);
424	    break;
425	case AF_INET6:
426#define UC(b)	(((int)b)&0xff)
427	    e = -1;
428	    sin6 = (struct sockaddr_in6 *)&sin;
429	    if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
430			    hname, sizeof(hname),
431			    NULL, 0, NI_NUMERICHOST) == 0) {
432		e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
433			     htons(sin6->sin6_port));
434		if (e == -1)
435		    goto ouch;
436	    }
437	    if (e != FTP_OK) {
438		ap = (char *)&sin6->sin6_addr;
439		e = _ftp_cmd(cd,
440     "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
441			     6, 16,
442			     UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
443			     UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
444			     UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
445			     UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
446			     2,
447			     (ntohs(sin6->sin6_port) >> 8) & 0xff,
448			     ntohs(sin6->sin6_port)        & 0xff);
449	    }
450	    break;
451	default:
452	    e = 999;		/* XXX: error code should be prepared */
453	    goto ouch;
454	}
455	if (e != FTP_OK)
456	    goto ouch;
457
458	/* seek to required offset */
459	if (offset)
460	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
461		goto sysouch;
462
463	/* make the server initiate the transfer */
464	if (verbose)
465	    _fetch_info("initiating transfer");
466	e = _ftp_cmd(cd, "%s %s", oper, s);
467	if (e != FTP_OPEN_DATA_CONNECTION)
468	    goto ouch;
469
470	/* accept the incoming connection and go to town */
471	if ((d = accept(sd, NULL, NULL)) == -1)
472	    goto sysouch;
473	close(sd);
474	sd = d;
475    }
476
477    if ((df = fdopen(sd, mode)) == NULL)
478	goto sysouch;
479    return df;
480
481sysouch:
482    _fetch_syserr();
483    if (sd >= 0)
484	close(sd);
485    return NULL;
486
487ouch:
488    if (e != -1)
489	_ftp_seterr(e);
490    if (sd >= 0)
491	close(sd);
492    return NULL;
493}
494
495/*
496 * Log on to FTP server
497 */
498static int
499_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
500{
501    int cd, e, pp = 0, direct, verbose;
502#ifdef INET6
503    int af = AF_UNSPEC;
504#else
505    int af = AF_INET;
506#endif
507    char *p, *q;
508    const char *logname;
509    char localhost[MAXHOSTNAMELEN];
510    char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
511
512    direct = (flags && strchr(flags, 'd'));
513    verbose = (flags && strchr(flags, 'v'));
514    if ((flags && strchr(flags, '4')))
515	af = AF_INET;
516    else if ((flags && strchr(flags, '6')))
517	af = AF_INET6;
518
519    /* check for proxy */
520    if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
521	char c = 0;
522
523#ifdef INET6
524	if (*p != '[' || (q = strchr(p + 1, ']')) == NULL ||
525	    (*++q != '\0' && *q != ':'))
526#endif
527	    q = strchr(p, ':');
528	if (q != NULL && *q == ':') {
529	    if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) {
530		/* XXX we should emit some kind of warning */
531	    }
532	    pp = atoi(q+1);
533	    if (pp < 1 || pp > 65535) {
534		/* XXX we should emit some kind of warning */
535	    }
536	}
537	if (!pp) {
538	    struct servent *se;
539
540	    if ((se = getservbyname("ftp", "tcp")) != NULL)
541		pp = ntohs(se->s_port);
542	    else
543		pp = FTP_DEFAULT_PORT;
544	}
545	if (q) {
546#ifdef INET6
547	    if (q > p && *p == '[' && *(q - 1) == ']') {
548		p++;
549		q--;
550	    }
551#endif
552	    c = *q;
553	    *q = 0;
554	}
555	cd = _fetch_connect(p, pp, af, verbose);
556	if (q)
557	    *q = c;
558    } else {
559	/* no proxy, go straight to target */
560	cd = _fetch_connect(host, port, af, verbose);
561	p = NULL;
562    }
563
564    /* check connection */
565    if (cd == -1) {
566	_fetch_syserr();
567	return NULL;
568    }
569
570    /* expect welcome message */
571    if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
572	goto fouch;
573
574    /* send user name and password */
575    if (!user || !*user)
576	user = FTP_ANONYMOUS_USER;
577    e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
578	  : _ftp_cmd(cd, "USER %s", user);
579
580    /* did the server request a password? */
581    if (e == FTP_NEED_PASSWORD) {
582	if (!pwd || !*pwd)
583	    pwd = getenv("FTP_PASSWORD");
584	if (!pwd || !*pwd) {
585	    if ((logname = getlogin()) == 0)
586		logname = FTP_ANONYMOUS_PASSWORD;
587	    gethostname(localhost, sizeof localhost);
588	    snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost);
589	    pwd = pbuf;
590	}
591	e = _ftp_cmd(cd, "PASS %s", pwd);
592    }
593
594    /* did the server request an account? */
595    if (e == FTP_NEED_ACCOUNT)
596	goto fouch;
597
598    /* we should be done by now */
599    if (e != FTP_LOGGED_IN)
600	goto fouch;
601
602    /* might as well select mode and type at once */
603#ifdef FTP_FORCE_STREAM_MODE
604    if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
605	goto fouch;
606#endif
607    if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
608	goto fouch;
609
610    /* done */
611    return cd;
612
613fouch:
614    if (e != -1)
615	_ftp_seterr(e);
616    close(cd);
617    return NULL;
618}
619
620/*
621 * Disconnect from server
622 */
623static void
624_ftp_disconnect(int cd)
625{
626    (void)_ftp_cmd(cd, "QUIT");
627    close(cd);
628}
629
630/*
631 * Check if we're already connected
632 */
633static int
634_ftp_isconnected(struct url *url)
635{
636    return (cached_socket
637	    && (strcmp(url->host, cached_host.host) == 0)
638	    && (strcmp(url->user, cached_host.user) == 0)
639	    && (strcmp(url->pwd, cached_host.pwd) == 0)
640	    && (url->port == cached_host.port));
641}
642
643/*
644 * Check the cache, reconnect if no luck
645 */
646static int
647_ftp_cached_connect(struct url *url, char *flags)
648{
649    int e, cd;
650
651    cd = -1;
652
653    /* set default port */
654    if (!url->port) {
655	struct servent *se;
656
657	if ((se = getservbyname("ftp", "tcp")) != NULL)
658	    url->port = ntohs(se->s_port);
659	else
660	    url->port = FTP_DEFAULT_PORT;
661    }
662
663    /* try to use previously cached connection */
664    if (_ftp_isconnected(url)) {
665	e = _ftp_cmd(cached_socket, "NOOP");
666	if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
667	    cd = cached_socket;
668    }
669
670    /* connect to server */
671    if (cd == -1) {
672	cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
673	if (cd == -1)
674	    return -1;
675	if (cached_socket)
676	    _ftp_disconnect(cached_socket);
677	cached_socket = cd;
678	memcpy(&cached_host, url, sizeof *url);
679    }
680
681    return cd;
682}
683
684/*
685 * Get file
686 */
687FILE *
688fetchGetFTP(struct url *url, char *flags)
689{
690    int cd;
691
692    /* connect to server */
693    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
694	return NULL;
695
696    /* initiate the transfer */
697    return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags);
698}
699
700/*
701 * Put file
702 */
703FILE *
704fetchPutFTP(struct url *url, char *flags)
705{
706    int cd;
707
708    /* connect to server */
709    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
710	return NULL;
711
712    /* initiate the transfer */
713    return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
714			 url->doc, "w", url->offset, flags);
715}
716
717/*
718 * Get file stats
719 */
720int
721fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
722{
723    char *ln, *s;
724    struct tm tm;
725    time_t t;
726    int e, cd;
727
728    us->size = -1;
729    us->atime = us->mtime = 0;
730
731    /* connect to server */
732    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
733	return -1;
734
735    /* change directory */
736    if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
737	*s = 0;
738	if ((e = _ftp_cmd(cd, "CWD %s", url->doc)) != FTP_FILE_ACTION_OK) {
739	    *s = '/';
740	    goto ouch;
741	}
742	*s++ = '/';
743    } else {
744	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK)
745	    goto ouch;
746    }
747
748    /* s now points to file name */
749
750    if (_ftp_cmd(cd, "SIZE %s", s) != FTP_FILE_STATUS)
751	goto ouch;
752    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
753	/* nothing */ ;
754    for (us->size = 0; *ln && isdigit(*ln); ln++)
755	us->size = us->size * 10 + *ln - '0';
756    if (*ln && !isspace(*ln)) {
757	_ftp_seterr(999);
758	return -1;
759    }
760    DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
761
762    if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS)
763	goto ouch;
764    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
765	/* nothing */ ;
766    e = 999;
767    switch (strspn(ln, "0123456789")) {
768    case 14:
769	break;
770    case 15:
771	ln++;
772	ln[0] = '2';
773	ln[1] = '0';
774	break;
775    default:
776	goto ouch;
777    }
778    if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
779	       &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
780	       &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
781	goto ouch;
782    tm.tm_mon--;
783    tm.tm_year -= 1900;
784    tm.tm_isdst = -1;
785    t = timegm(&tm);
786    if (t == (time_t)-1)
787	t = time(NULL);
788    us->mtime = t;
789    us->atime = t;
790    DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
791		  "%02d:%02d:%02d\033[m]\n",
792		  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
793		  tm.tm_hour, tm.tm_min, tm.tm_sec));
794    return 0;
795
796ouch:
797    if (e != -1)
798	_ftp_seterr(e);
799    return -1;
800}
801
802/*
803 * List a directory
804 */
805extern void warnx(char *, ...);
806struct url_ent *
807fetchListFTP(struct url *url, char *flags)
808{
809    warnx("fetchListFTP(): not implemented");
810    return NULL;
811}
812