ftp.c revision 62888 
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 62888 2000-07-10 08:41:25Z 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    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      	switch (e) {
304	case FTP_PASSIVE_MODE:
305	case FTP_LPASSIVE_MODE:
306	    for (p = ln + 3; *p && !isdigit(*p); p++)
307		/* nothing */ ;
308	    if (!*p) {
309		e = 999;
310		goto ouch;
311	    }
312	    l = (e == FTP_PASSIVE_MODE ? 6 : 21);
313	    for (i = 0; *p && i < l; i++, p++)
314		addr[i] = strtol(p, &p, 10);
315	    if (i < l) {
316		e = 999;
317		goto ouch;
318	    }
319	    break;
320	case FTP_EPASSIVE_MODE:
321	    for (p = ln + 3; *p && *p != '('; p++)
322		/* nothing */ ;
323	    if (!*p) {
324		e = 999;
325		goto ouch;
326	    }
327	    ++p;
328	    if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
329		       &port, &addr[3]) != 5 ||
330		addr[0] != addr[1] ||
331		addr[0] != addr[2] || addr[0] != addr[3]) {
332		e = 999;
333		goto ouch;
334	    }
335	    break;
336	}
337
338	/* seek to required offset */
339	if (offset)
340	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
341		goto sysouch;
342
343	/* construct sockaddr for data socket */
344	l = sizeof sin;
345	if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
346	    goto sysouch;
347	if (sin.ss_family == AF_INET6)
348	    unmappedaddr((struct sockaddr_in6 *)&sin);
349	switch (sin.ss_family) {
350	case AF_INET6:
351	    sin6 = (struct sockaddr_in6 *)&sin;
352	    if (e == FTP_EPASSIVE_MODE)
353		sin6->sin6_port = htons(port);
354	    else {
355		bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
356		bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
357	    }
358	    break;
359	case AF_INET:
360	    sin4 = (struct sockaddr_in *)&sin;
361	    if (e == FTP_EPASSIVE_MODE)
362		sin4->sin_port = htons(port);
363	    else {
364		bcopy(addr, (char *)&sin4->sin_addr, 4);
365		bcopy(addr + 4, (char *)&sin4->sin_port, 2);
366	    }
367	    break;
368	default:
369	    e = 999;		/* XXX: error code should be prepared */
370	    break;
371	}
372
373	/* connect to data port */
374	if (verbose)
375	    _fetch_info("opening data connection");
376	if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
377	    goto sysouch;
378
379	/* make the server initiate the transfer */
380	if (verbose)
381	    _fetch_info("initiating transfer");
382	e = _ftp_cmd(cd, "%s %s", oper, s);
383	if (e != FTP_OPEN_DATA_CONNECTION)
384	    goto ouch;
385
386    } else {
387	u_int32_t a;
388	u_short p;
389	int arg, d;
390	char *ap;
391	char hname[INET6_ADDRSTRLEN];
392
393	switch (sin.ss_family) {
394	case AF_INET6:
395	    ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
396#ifdef IPV6_PORTRANGE
397	    arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
398	    if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
399			   (char *)&arg, sizeof(arg)) == -1)
400		goto sysouch;
401#endif
402	    break;
403	case AF_INET:
404	    ((struct sockaddr_in *)&sin)->sin_port = 0;
405	    arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
406	    if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
407			   (char *)&arg, sizeof arg) == -1)
408		goto sysouch;
409	    break;
410	}
411	if (verbose)
412	    _fetch_info("binding data socket");
413	if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
414	    goto sysouch;
415	if (listen(sd, 1) == -1)
416	    goto sysouch;
417
418	/* find what port we're on and tell the server */
419	if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
420	    goto sysouch;
421	switch (sin.ss_family) {
422	case AF_INET:
423	    sin4 = (struct sockaddr_in *)&sin;
424	    a = ntohl(sin4->sin_addr.s_addr);
425	    p = ntohs(sin4->sin_port);
426	    e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
427			 (a >> 24) & 0xff, (a >> 16) & 0xff,
428			 (a >> 8) & 0xff, a & 0xff,
429			 (p >> 8) & 0xff, p & 0xff);
430	    break;
431	case AF_INET6:
432#define UC(b)	(((int)b)&0xff)
433	    e = -1;
434	    sin6 = (struct sockaddr_in6 *)&sin;
435	    if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
436			    hname, sizeof(hname),
437			    NULL, 0, NI_NUMERICHOST) == 0) {
438		e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
439			     htons(sin6->sin6_port));
440		if (e == -1)
441		    goto ouch;
442	    }
443	    if (e != FTP_OK) {
444		ap = (char *)&sin6->sin6_addr;
445		e = _ftp_cmd(cd,
446     "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
447			     6, 16,
448			     UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
449			     UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
450			     UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
451			     UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
452			     2,
453			     (ntohs(sin6->sin6_port) >> 8) & 0xff,
454			     ntohs(sin6->sin6_port)        & 0xff);
455	    }
456	    break;
457	default:
458	    e = 999;		/* XXX: error code should be prepared */
459	    goto ouch;
460	}
461	if (e != FTP_OK)
462	    goto ouch;
463
464	/* seek to required offset */
465	if (offset)
466	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
467		goto sysouch;
468
469	/* make the server initiate the transfer */
470	if (verbose)
471	    _fetch_info("initiating transfer");
472	e = _ftp_cmd(cd, "%s %s", oper, s);
473	if (e != FTP_OPEN_DATA_CONNECTION)
474	    goto ouch;
475
476	/* accept the incoming connection and go to town */
477	if ((d = accept(sd, NULL, NULL)) == -1)
478	    goto sysouch;
479	close(sd);
480	sd = d;
481    }
482
483    if ((df = fdopen(sd, mode)) == NULL)
484	goto sysouch;
485    return df;
486
487sysouch:
488    _fetch_syserr();
489    if (sd >= 0)
490	close(sd);
491    return NULL;
492
493ouch:
494    if (e != -1)
495	_ftp_seterr(e);
496    if (sd >= 0)
497	close(sd);
498    return NULL;
499}
500
501/*
502 * Log on to FTP server
503 */
504static int
505_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
506{
507    int cd, e, pp = 0, direct, verbose;
508#ifdef INET6
509    int af = AF_UNSPEC;
510#else
511    int af = AF_INET;
512#endif
513    char *p, *q;
514    const char *logname;
515    char localhost[MAXHOSTNAMELEN];
516    char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
517
518    direct = (flags && strchr(flags, 'd'));
519    verbose = (flags && strchr(flags, 'v'));
520    if ((flags && strchr(flags, '4')))
521	af = AF_INET;
522    else if ((flags && strchr(flags, '6')))
523	af = AF_INET6;
524
525    /* check for proxy */
526    if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
527	char c = 0;
528
529#ifdef INET6
530	if (*p != '[' || (q = strchr(p + 1, ']')) == NULL ||
531	    (*++q != '\0' && *q != ':'))
532#endif
533	    q = strchr(p, ':');
534	if (q != NULL && *q == ':') {
535	    if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) {
536		/* XXX we should emit some kind of warning */
537	    }
538	    pp = atoi(q+1);
539	    if (pp < 1 || pp > 65535) {
540		/* XXX we should emit some kind of warning */
541	    }
542	}
543	if (!pp) {
544	    struct servent *se;
545
546	    if ((se = getservbyname("ftp", "tcp")) != NULL)
547		pp = ntohs(se->s_port);
548	    else
549		pp = FTP_DEFAULT_PORT;
550	}
551	if (q) {
552#ifdef INET6
553	    if (q > p && *p == '[' && *(q - 1) == ']') {
554		p++;
555		q--;
556	    }
557#endif
558	    c = *q;
559	    *q = 0;
560	}
561	cd = _fetch_connect(p, pp, af, verbose);
562	if (q)
563	    *q = c;
564    } else {
565	/* no proxy, go straight to target */
566	cd = _fetch_connect(host, port, af, verbose);
567	p = NULL;
568    }
569
570    /* check connection */
571    if (cd == -1) {
572	_fetch_syserr();
573	return NULL;
574    }
575
576    /* expect welcome message */
577    if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
578	goto fouch;
579
580    /* send user name and password */
581    if (!user || !*user)
582	user = FTP_ANONYMOUS_USER;
583    e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
584	  : _ftp_cmd(cd, "USER %s", user);
585
586    /* did the server request a password? */
587    if (e == FTP_NEED_PASSWORD) {
588	if (!pwd || !*pwd)
589	    pwd = getenv("FTP_PASSWORD");
590	if (!pwd || !*pwd) {
591	    if ((logname = getlogin()) == 0)
592		logname = FTP_ANONYMOUS_PASSWORD;
593	    gethostname(localhost, sizeof localhost);
594	    snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost);
595	    pwd = pbuf;
596	}
597	e = _ftp_cmd(cd, "PASS %s", pwd);
598    }
599
600    /* did the server request an account? */
601    if (e == FTP_NEED_ACCOUNT)
602	goto fouch;
603
604    /* we should be done by now */
605    if (e != FTP_LOGGED_IN)
606	goto fouch;
607
608    /* might as well select mode and type at once */
609#ifdef FTP_FORCE_STREAM_MODE
610    if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
611	goto fouch;
612#endif
613    if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
614	goto fouch;
615
616    /* done */
617    return cd;
618
619fouch:
620    if (e != -1)
621	_ftp_seterr(e);
622    close(cd);
623    return NULL;
624}
625
626/*
627 * Disconnect from server
628 */
629static void
630_ftp_disconnect(int cd)
631{
632    (void)_ftp_cmd(cd, "QUIT");
633    close(cd);
634}
635
636/*
637 * Check if we're already connected
638 */
639static int
640_ftp_isconnected(struct url *url)
641{
642    return (cached_socket
643	    && (strcmp(url->host, cached_host.host) == 0)
644	    && (strcmp(url->user, cached_host.user) == 0)
645	    && (strcmp(url->pwd, cached_host.pwd) == 0)
646	    && (url->port == cached_host.port));
647}
648
649/*
650 * Check the cache, reconnect if no luck
651 */
652static int
653_ftp_cached_connect(struct url *url, char *flags)
654{
655    int e, cd;
656
657    cd = -1;
658
659    /* set default port */
660    if (!url->port) {
661	struct servent *se;
662
663	if ((se = getservbyname("ftp", "tcp")) != NULL)
664	    url->port = ntohs(se->s_port);
665	else
666	    url->port = FTP_DEFAULT_PORT;
667    }
668
669    /* try to use previously cached connection */
670    if (_ftp_isconnected(url)) {
671	e = _ftp_cmd(cached_socket, "NOOP");
672	if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
673	    cd = cached_socket;
674    }
675
676    /* connect to server */
677    if (cd == -1) {
678	cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
679	if (cd == -1)
680	    return -1;
681	if (cached_socket)
682	    _ftp_disconnect(cached_socket);
683	cached_socket = cd;
684	memcpy(&cached_host, url, sizeof *url);
685    }
686
687    return cd;
688}
689
690/*
691 * Get file
692 */
693FILE *
694fetchGetFTP(struct url *url, char *flags)
695{
696    int cd;
697
698    /* connect to server */
699    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
700	return NULL;
701
702    /* initiate the transfer */
703    return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags);
704}
705
706/*
707 * Put file
708 */
709FILE *
710fetchPutFTP(struct url *url, char *flags)
711{
712    int cd;
713
714    /* connect to server */
715    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
716	return NULL;
717
718    /* initiate the transfer */
719    return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
720			 url->doc, "w", url->offset, flags);
721}
722
723/*
724 * Get file stats
725 */
726int
727fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
728{
729    char *ln, *s;
730    struct tm tm;
731    time_t t;
732    int e, cd;
733
734    us->size = -1;
735    us->atime = us->mtime = 0;
736
737    /* connect to server */
738    if ((cd = _ftp_cached_connect(url, flags)) == NULL)
739	return -1;
740
741    /* change directory */
742    if (((s = strrchr(url->doc, '/')) != NULL) && (s != url->doc)) {
743	*s = 0;
744	if ((e = _ftp_cmd(cd, "CWD %s", url->doc)) != FTP_FILE_ACTION_OK) {
745	    *s = '/';
746	    goto ouch;
747	}
748	*s++ = '/';
749    } else {
750	if ((e = _ftp_cmd(cd, "CWD /")) != FTP_FILE_ACTION_OK)
751	    goto ouch;
752    }
753
754    /* s now points to file name */
755
756    if (_ftp_cmd(cd, "SIZE %s", s) != FTP_FILE_STATUS)
757	goto ouch;
758    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
759	/* nothing */ ;
760    for (us->size = 0; *ln && isdigit(*ln); ln++)
761	us->size = us->size * 10 + *ln - '0';
762    if (*ln && !isspace(*ln)) {
763	_ftp_seterr(999);
764	return -1;
765    }
766    DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
767
768    if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS)
769	goto ouch;
770    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
771	/* nothing */ ;
772    e = 999;
773    switch (strspn(ln, "0123456789")) {
774    case 14:
775	break;
776    case 15:
777	ln++;
778	ln[0] = '2';
779	ln[1] = '0';
780	break;
781    default:
782	goto ouch;
783    }
784    if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
785	       &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
786	       &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6)
787	goto ouch;
788    tm.tm_mon--;
789    tm.tm_year -= 1900;
790    tm.tm_isdst = -1;
791    t = timegm(&tm);
792    if (t == (time_t)-1)
793	t = time(NULL);
794    us->mtime = t;
795    us->atime = t;
796    DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
797		  "%02d:%02d:%02d\033[m]\n",
798		  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
799		  tm.tm_hour, tm.tm_min, tm.tm_sec));
800    return 0;
801
802ouch:
803    if (e != -1)
804	_ftp_seterr(e);
805    return -1;
806}
807
808/*
809 * List a directory
810 */
811extern void warnx(char *, ...);
812struct url_ent *
813fetchListFTP(struct url *url, char *flags)
814{
815    warnx("fetchListFTP(): not implemented");
816    return NULL;
817}
818