ftp.c revision 73932 
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 73932 2001-03-07 04:45:55Z 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 <netinet/in.h>
61
62#include <ctype.h>
63#include <errno.h>
64#include <fcntl.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	"anonymous"
78
79#define FTP_CONNECTION_ALREADY_OPEN	125
80#define FTP_OPEN_DATA_CONNECTION	150
81#define FTP_OK				200
82#define FTP_FILE_STATUS			213
83#define FTP_SERVICE_READY		220
84#define FTP_TRANSFER_COMPLETE		226
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#define FTP_PROTOCOL_ERROR		999
95
96static struct url cached_host;
97static int cached_socket;
98
99static char *last_reply;
100static size_t lr_size, lr_length;
101static int last_code;
102
103#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
104			 && isdigit(foo[2]) \
105                         && (foo[3] == ' ' || foo[3] == '\0'))
106#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
107			&& isdigit(foo[2]) && foo[3] == '-')
108
109/* translate IPv4 mapped IPv6 address to IPv4 address */
110static void
111unmappedaddr(struct sockaddr_in6 *sin6)
112{
113    struct sockaddr_in *sin4;
114    u_int32_t addr;
115    int port;
116
117    if (sin6->sin6_family != AF_INET6 ||
118	!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
119	return;
120    sin4 = (struct sockaddr_in *)sin6;
121    addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
122    port = sin6->sin6_port;
123    memset(sin4, 0, sizeof(struct sockaddr_in));
124    sin4->sin_addr.s_addr = addr;
125    sin4->sin_port = port;
126    sin4->sin_family = AF_INET;
127    sin4->sin_len = sizeof(struct sockaddr_in);
128}
129
130/*
131 * Get server response
132 */
133static int
134_ftp_chkerr(int cd)
135{
136    if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
137	_fetch_syserr();
138	return -1;
139    }
140    if (isftpinfo(last_reply)) {
141	while (lr_length && !isftpreply(last_reply)) {
142	    if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
143		_fetch_syserr();
144		return -1;
145	    }
146	}
147    }
148
149    while (lr_length && isspace(last_reply[lr_length-1]))
150	lr_length--;
151    last_reply[lr_length] = 0;
152
153    if (!isftpreply(last_reply)) {
154	_ftp_seterr(FTP_PROTOCOL_ERROR);
155	return -1;
156    }
157
158    last_code = (last_reply[0] - '0') * 100
159	+ (last_reply[1] - '0') * 10
160	+ (last_reply[2] - '0');
161
162    return last_code;
163}
164
165/*
166 * Send a command and check reply
167 */
168static int
169_ftp_cmd(int cd, char *fmt, ...)
170{
171    va_list ap;
172    size_t len;
173    char *msg;
174    int r;
175
176    va_start(ap, fmt);
177    len = vasprintf(&msg, fmt, ap);
178    va_end(ap);
179
180    if (msg == NULL) {
181	errno = ENOMEM;
182	_fetch_syserr();
183	return -1;
184    }
185
186    r = _fetch_putln(cd, msg, len);
187    free(msg);
188
189    if (r == -1) {
190	_fetch_syserr();
191	return -1;
192    }
193
194    return _ftp_chkerr(cd);
195}
196
197/*
198 * Return a pointer to the filename part of a path
199 */
200static char *
201_ftp_filename(char *file)
202{
203    char *s;
204
205    if ((s = strrchr(file, '/')) == NULL)
206	return file;
207    else
208	return s + 1;
209}
210
211/*
212 * Change working directory to the directory that contains the
213 * specified file.
214 */
215static int
216_ftp_cwd(int cd, char *file)
217{
218    char *s;
219    int e;
220
221    if ((s = strrchr(file, '/')) == NULL || s == file) {
222	e = _ftp_cmd(cd, "CWD /");
223    } else {
224	e = _ftp_cmd(cd, "CWD %.*s", s - file, file);
225    }
226    if (e != FTP_FILE_ACTION_OK) {
227	_ftp_seterr(e);
228	return -1;
229    }
230    return 0;
231}
232
233/*
234 * Request and parse file stats
235 */
236static int
237_ftp_stat(int cd, char *file, struct url_stat *us)
238{
239    char *ln, *s;
240    struct tm tm;
241    time_t t;
242    int e;
243
244    us->size = -1;
245    us->atime = us->mtime = 0;
246
247    if ((s = strrchr(file, '/')) == NULL)
248	s = file;
249    else
250	++s;
251
252    if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) {
253	_ftp_seterr(e);
254	return -1;
255    }
256    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
257	/* nothing */ ;
258    for (us->size = 0; *ln && isdigit(*ln); ln++)
259	us->size = us->size * 10 + *ln - '0';
260    if (*ln && !isspace(*ln)) {
261	_ftp_seterr(FTP_PROTOCOL_ERROR);
262	return -1;
263    }
264    if (us->size == 0)
265	us->size = -1;
266    DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
267
268    if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) {
269	_ftp_seterr(e);
270	return -1;
271    }
272    for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
273	/* nothing */ ;
274    switch (strspn(ln, "0123456789")) {
275    case 14:
276	break;
277    case 15:
278	ln++;
279	ln[0] = '2';
280	ln[1] = '0';
281	break;
282    default:
283	_ftp_seterr(FTP_PROTOCOL_ERROR);
284	return -1;
285    }
286    if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
287	       &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
288	       &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
289	_ftp_seterr(FTP_PROTOCOL_ERROR);
290	return -1;
291    }
292    tm.tm_mon--;
293    tm.tm_year -= 1900;
294    tm.tm_isdst = -1;
295    t = timegm(&tm);
296    if (t == (time_t)-1)
297	t = time(NULL);
298    us->mtime = t;
299    us->atime = t;
300    DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
301		  "%02d:%02d:%02d\033[m]\n",
302		  tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
303		  tm.tm_hour, tm.tm_min, tm.tm_sec));
304    return 0;
305}
306
307/*
308 * I/O functions for FTP
309 */
310struct ftpio {
311    int		 csd;		/* Control socket descriptor */
312    int		 dsd;		/* Data socket descriptor */
313    int		 dir;		/* Direction */
314    int		 eof;		/* EOF reached */
315    int		 err;		/* Error code */
316};
317
318static int	_ftp_readfn(void *, char *, int);
319static int	_ftp_writefn(void *, const char *, int);
320static fpos_t	_ftp_seekfn(void *, fpos_t, int);
321static int	_ftp_closefn(void *);
322
323static int
324_ftp_readfn(void *v, char *buf, int len)
325{
326    struct ftpio *io;
327    int r;
328
329    io = (struct ftpio *)v;
330    if (io == NULL) {
331	errno = EBADF;
332	return -1;
333    }
334    if (io->csd == -1 || io->dsd == -1 || io->dir == O_WRONLY) {
335	errno = EBADF;
336	return -1;
337    }
338    if (io->err) {
339	errno = io->err;
340	return -1;
341    }
342    if (io->eof)
343	return 0;
344    r = read(io->dsd, buf, len);
345    if (r > 0)
346	return r;
347    if (r == 0) {
348	io->eof = 1;
349	return _ftp_closefn(v);
350    }
351    io->err = errno;
352    return -1;
353}
354
355static int
356_ftp_writefn(void *v, const char *buf, int len)
357{
358    struct ftpio *io;
359    int w;
360
361    io = (struct ftpio *)v;
362    if (io == NULL) {
363	errno = EBADF;
364	return -1;
365    }
366    if (io->csd == -1 || io->dsd == -1 || io->dir == O_RDONLY) {
367	errno = EBADF;
368	return -1;
369    }
370    if (io->err) {
371	errno = io->err;
372	return -1;
373    }
374    w = write(io->dsd, buf, len);
375    if (w >= 0)
376	return w;
377    io->err = errno;
378    return -1;
379}
380
381static fpos_t
382_ftp_seekfn(void *v, fpos_t pos, int whence)
383{
384    struct ftpio *io;
385
386    io = (struct ftpio *)v;
387    if (io == NULL) {
388	errno = EBADF;
389	return -1;
390    }
391    errno = ESPIPE;
392    return -1;
393}
394
395static int
396_ftp_closefn(void *v)
397{
398    struct ftpio *io;
399    int r;
400
401    io = (struct ftpio *)v;
402    if (io == NULL) {
403	errno = EBADF;
404	return -1;
405    }
406    if (io->dir == -1)
407	return 0;
408    if (io->csd == -1 || io->dsd == -1) {
409	errno = EBADF;
410	return -1;
411    }
412    close(io->dsd);
413    io->dir = -1;
414    io->dsd = -1;
415    DEBUG(fprintf(stderr, "Waiting for final status\n"));
416    if ((r = _ftp_chkerr(io->csd)) != FTP_TRANSFER_COMPLETE)
417	io->err = r;
418    else
419	io->err = 0;
420    close(io->csd);
421    io->csd = -1;
422    return io->err ? -1 : 0;
423}
424
425static FILE *
426_ftp_setup(int csd, int dsd, int mode)
427{
428    struct ftpio *io;
429    FILE *f;
430
431    if ((io = malloc(sizeof *io)) == NULL)
432	return NULL;
433    io->csd = dup(csd);
434    io->dsd = dsd;
435    io->dir = mode;
436    io->eof = io->err = 0;
437    f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn);
438    if (f == NULL)
439	free(io);
440    return f;
441}
442
443/*
444 * Transfer file
445 */
446static FILE *
447_ftp_transfer(int cd, char *oper, char *file,
448	      int mode, off_t offset, char *flags)
449{
450    struct sockaddr_storage sin;
451    struct sockaddr_in6 *sin6;
452    struct sockaddr_in *sin4;
453    int pasv, high, verbose;
454    int e, sd = -1;
455    socklen_t l;
456    char *s;
457    FILE *df;
458
459    /* check flags */
460    pasv = CHECK_FLAG('p');
461    high = CHECK_FLAG('h');
462    verbose = CHECK_FLAG('v');
463
464    /* passive mode */
465    if (!pasv)
466	pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL &&
467		strncasecmp(s, "no", 2) != 0);
468
469    /* find our own address, bind, and listen */
470    l = sizeof sin;
471    if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
472	goto sysouch;
473    if (sin.ss_family == AF_INET6)
474	unmappedaddr((struct sockaddr_in6 *)&sin);
475
476    /* open data socket */
477    if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
478	_fetch_syserr();
479	return NULL;
480    }
481
482    if (pasv) {
483	u_char addr[64];
484	char *ln, *p;
485	int i;
486	int port;
487
488	/* send PASV command */
489	if (verbose)
490	    _fetch_info("setting passive mode");
491	switch (sin.ss_family) {
492	case AF_INET:
493	    if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
494		goto ouch;
495	    break;
496	case AF_INET6:
497	    if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
498		if (e == -1)
499		    goto ouch;
500		if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
501		    goto ouch;
502	    }
503	    break;
504	default:
505	    e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
506	    goto ouch;
507	}
508
509	/*
510	 * Find address and port number. The reply to the PASV command
511         * is IMHO the one and only weak point in the FTP protocol.
512	 */
513	ln = last_reply;
514      	switch (e) {
515	case FTP_PASSIVE_MODE:
516	case FTP_LPASSIVE_MODE:
517	    for (p = ln + 3; *p && !isdigit(*p); p++)
518		/* nothing */ ;
519	    if (!*p) {
520		e = FTP_PROTOCOL_ERROR;
521		goto ouch;
522	    }
523	    l = (e == FTP_PASSIVE_MODE ? 6 : 21);
524	    for (i = 0; *p && i < l; i++, p++)
525		addr[i] = strtol(p, &p, 10);
526	    if (i < l) {
527		e = FTP_PROTOCOL_ERROR;
528		goto ouch;
529	    }
530	    break;
531	case FTP_EPASSIVE_MODE:
532	    for (p = ln + 3; *p && *p != '('; p++)
533		/* nothing */ ;
534	    if (!*p) {
535		e = FTP_PROTOCOL_ERROR;
536		goto ouch;
537	    }
538	    ++p;
539	    if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
540		       &port, &addr[3]) != 5 ||
541		addr[0] != addr[1] ||
542		addr[0] != addr[2] || addr[0] != addr[3]) {
543		e = FTP_PROTOCOL_ERROR;
544		goto ouch;
545	    }
546	    break;
547	}
548
549	/* seek to required offset */
550	if (offset)
551	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
552		goto sysouch;
553
554	/* construct sockaddr for data socket */
555	l = sizeof sin;
556	if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
557	    goto sysouch;
558	if (sin.ss_family == AF_INET6)
559	    unmappedaddr((struct sockaddr_in6 *)&sin);
560	switch (sin.ss_family) {
561	case AF_INET6:
562	    sin6 = (struct sockaddr_in6 *)&sin;
563	    if (e == FTP_EPASSIVE_MODE)
564		sin6->sin6_port = htons(port);
565	    else {
566		bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
567		bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
568	    }
569	    break;
570	case AF_INET:
571	    sin4 = (struct sockaddr_in *)&sin;
572	    if (e == FTP_EPASSIVE_MODE)
573		sin4->sin_port = htons(port);
574	    else {
575		bcopy(addr, (char *)&sin4->sin_addr, 4);
576		bcopy(addr + 4, (char *)&sin4->sin_port, 2);
577	    }
578	    break;
579	default:
580	    e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
581	    break;
582	}
583
584	/* connect to data port */
585	if (verbose)
586	    _fetch_info("opening data connection");
587	if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
588	    goto sysouch;
589
590	/* make the server initiate the transfer */
591	if (verbose)
592	    _fetch_info("initiating transfer");
593	e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
594	if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
595	    goto ouch;
596
597    } else {
598	u_int32_t a;
599	u_short p;
600	int arg, d;
601	char *ap;
602	char hname[INET6_ADDRSTRLEN];
603
604	switch (sin.ss_family) {
605	case AF_INET6:
606	    ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
607#ifdef IPV6_PORTRANGE
608	    arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
609	    if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
610			   (char *)&arg, sizeof(arg)) == -1)
611		goto sysouch;
612#endif
613	    break;
614	case AF_INET:
615	    ((struct sockaddr_in *)&sin)->sin_port = 0;
616	    arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
617	    if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
618			   (char *)&arg, sizeof arg) == -1)
619		goto sysouch;
620	    break;
621	}
622	if (verbose)
623	    _fetch_info("binding data socket");
624	if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
625	    goto sysouch;
626	if (listen(sd, 1) == -1)
627	    goto sysouch;
628
629	/* find what port we're on and tell the server */
630	if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
631	    goto sysouch;
632	switch (sin.ss_family) {
633	case AF_INET:
634	    sin4 = (struct sockaddr_in *)&sin;
635	    a = ntohl(sin4->sin_addr.s_addr);
636	    p = ntohs(sin4->sin_port);
637	    e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
638			 (a >> 24) & 0xff, (a >> 16) & 0xff,
639			 (a >> 8) & 0xff, a & 0xff,
640			 (p >> 8) & 0xff, p & 0xff);
641	    break;
642	case AF_INET6:
643#define UC(b)	(((int)b)&0xff)
644	    e = -1;
645	    sin6 = (struct sockaddr_in6 *)&sin;
646	    if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
647			    hname, sizeof(hname),
648			    NULL, 0, NI_NUMERICHOST) == 0) {
649		e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
650			     htons(sin6->sin6_port));
651		if (e == -1)
652		    goto ouch;
653	    }
654	    if (e != FTP_OK) {
655		ap = (char *)&sin6->sin6_addr;
656		e = _ftp_cmd(cd,
657     "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
658			     6, 16,
659			     UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
660			     UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
661			     UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
662			     UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
663			     2,
664			     (ntohs(sin6->sin6_port) >> 8) & 0xff,
665			     ntohs(sin6->sin6_port)        & 0xff);
666	    }
667	    break;
668	default:
669	    e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
670	    goto ouch;
671	}
672	if (e != FTP_OK)
673	    goto ouch;
674
675	/* seek to required offset */
676	if (offset)
677	    if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
678		goto sysouch;
679
680	/* make the server initiate the transfer */
681	if (verbose)
682	    _fetch_info("initiating transfer");
683	e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
684	if (e != FTP_OPEN_DATA_CONNECTION)
685	    goto ouch;
686
687	/* accept the incoming connection and go to town */
688	if ((d = accept(sd, NULL, NULL)) == -1)
689	    goto sysouch;
690	close(sd);
691	sd = d;
692    }
693
694    if ((df = _ftp_setup(cd, sd, mode)) == NULL)
695	goto sysouch;
696    return df;
697
698sysouch:
699    _fetch_syserr();
700    if (sd >= 0)
701	close(sd);
702    return NULL;
703
704ouch:
705    if (e != -1)
706	_ftp_seterr(e);
707    if (sd >= 0)
708	close(sd);
709    return NULL;
710}
711
712/*
713 * Log on to FTP server
714 */
715static int
716_ftp_connect(struct url *url, struct url *purl, char *flags)
717{
718    int cd, e, direct, verbose;
719#ifdef INET6
720    int af = AF_UNSPEC;
721#else
722    int af = AF_INET;
723#endif
724    const char *logname;
725    char *user, *pwd;
726    char localhost[MAXHOSTNAMELEN];
727    char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
728
729    direct = CHECK_FLAG('d');
730    verbose = CHECK_FLAG('v');
731    if (CHECK_FLAG('4'))
732	af = AF_INET;
733    else if (CHECK_FLAG('6'))
734	af = AF_INET6;
735
736    if (direct)
737	purl = NULL;
738
739    /* check for proxy */
740    if (purl) {
741	/* XXX proxy authentication! */
742	cd = _fetch_connect(purl->host, purl->port, af, verbose);
743    } else {
744	/* no proxy, go straight to target */
745	cd = _fetch_connect(url->host, url->port, af, verbose);
746	purl = NULL;
747    }
748
749    /* check connection */
750    if (cd == -1) {
751	_fetch_syserr();
752	return NULL;
753    }
754
755    /* expect welcome message */
756    if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
757	goto fouch;
758
759    /* XXX FTP_AUTH, and maybe .netrc */
760
761    /* send user name and password */
762    user = url->user;
763    if (!user || !*user)
764	user = getenv("FTP_LOGIN");
765    if (!user || !*user)
766	user = FTP_ANONYMOUS_USER;
767    if (purl && url->port == _fetch_default_port(url->scheme))
768	e = _ftp_cmd(cd, "USER %s@%s", user, url->host);
769    else if (purl)
770	e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port);
771    else
772	e = _ftp_cmd(cd, "USER %s", user);
773
774    /* did the server request a password? */
775    if (e == FTP_NEED_PASSWORD) {
776	pwd = url->pwd;
777	if (!pwd || !*pwd)
778	    pwd = getenv("FTP_PASSWORD");
779	if (!pwd || !*pwd) {
780	    if ((logname = getlogin()) == 0)
781		logname = FTP_ANONYMOUS_USER;
782	    gethostname(localhost, sizeof localhost);
783	    snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost);
784	    pwd = pbuf;
785	}
786	e = _ftp_cmd(cd, "PASS %s", pwd);
787    }
788
789    /* did the server request an account? */
790    if (e == FTP_NEED_ACCOUNT)
791	goto fouch;
792
793    /* we should be done by now */
794    if (e != FTP_LOGGED_IN)
795	goto fouch;
796
797    /* might as well select mode and type at once */
798#ifdef FTP_FORCE_STREAM_MODE
799    if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
800	goto fouch;
801#endif
802    if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
803	goto fouch;
804
805    /* done */
806    return cd;
807
808fouch:
809    if (e != -1)
810	_ftp_seterr(e);
811    close(cd);
812    return NULL;
813}
814
815/*
816 * Disconnect from server
817 */
818static void
819_ftp_disconnect(int cd)
820{
821    (void)_ftp_cmd(cd, "QUIT");
822    close(cd);
823}
824
825/*
826 * Check if we're already connected
827 */
828static int
829_ftp_isconnected(struct url *url)
830{
831    return (cached_socket
832	    && (strcmp(url->host, cached_host.host) == 0)
833	    && (strcmp(url->user, cached_host.user) == 0)
834	    && (strcmp(url->pwd, cached_host.pwd) == 0)
835	    && (url->port == cached_host.port));
836}
837
838/*
839 * Check the cache, reconnect if no luck
840 */
841static int
842_ftp_cached_connect(struct url *url, struct url *purl, char *flags)
843{
844    int e, cd;
845
846    cd = -1;
847
848    /* set default port */
849    if (!url->port)
850	url->port = _fetch_default_port(url->scheme);
851
852    /* try to use previously cached connection */
853    if (_ftp_isconnected(url)) {
854	e = _ftp_cmd(cached_socket, "NOOP");
855	if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
856	    return cached_socket;
857    }
858
859    /* connect to server */
860    if ((cd = _ftp_connect(url, purl, flags)) == -1)
861	return -1;
862    if (cached_socket)
863	_ftp_disconnect(cached_socket);
864    cached_socket = cd;
865    memcpy(&cached_host, url, sizeof *url);
866    return cd;
867}
868
869/*
870 * Check the proxy settings
871 */
872static struct url *
873_ftp_get_proxy(void)
874{
875    struct url *purl;
876    char *p;
877
878    if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) ||
879	 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
880	*p && (purl = fetchParseURL(p)) != NULL) {
881	if (!*purl->scheme) {
882	    if (getenv("FTP_PROXY") || getenv("ftp_proxy"))
883		strcpy(purl->scheme, SCHEME_FTP);
884	    else
885		strcpy(purl->scheme, SCHEME_HTTP);
886	}
887	if (!purl->port)
888	    purl->port = _fetch_default_proxy_port(purl->scheme);
889	if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 ||
890	    strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
891	    return purl;
892	fetchFreeURL(purl);
893    }
894    return NULL;
895}
896
897/*
898 * Get and stat file
899 */
900FILE *
901fetchXGetFTP(struct url *url, struct url_stat *us, char *flags)
902{
903    struct url *purl;
904    int cd;
905
906    /* get the proxy URL, and check if we should use HTTP instead */
907    if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
908	if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
909	    return _http_request(url, "GET", us, purl, flags);
910    } else {
911	purl = NULL;
912    }
913
914    /* connect to server */
915    cd = _ftp_cached_connect(url, purl, flags);
916    if (purl)
917	fetchFreeURL(purl);
918    if (cd == NULL)
919	return NULL;
920
921    /* change directory */
922    if (_ftp_cwd(cd, url->doc) == -1)
923	return NULL;
924
925    /* stat file */
926    if (us && _ftp_stat(cd, url->doc, us) == -1
927	&& fetchLastErrCode != FETCH_PROTO
928	&& fetchLastErrCode != FETCH_UNAVAIL)
929	return NULL;
930
931    /* initiate the transfer */
932    return _ftp_transfer(cd, "RETR", url->doc, O_RDONLY, url->offset, flags);
933}
934
935/*
936 * Get file
937 */
938FILE *
939fetchGetFTP(struct url *url, char *flags)
940{
941    return fetchXGetFTP(url, NULL, flags);
942}
943
944/*
945 * Put file
946 */
947FILE *
948fetchPutFTP(struct url *url, char *flags)
949{
950    struct url *purl;
951    int cd;
952
953    /* get the proxy URL, and check if we should use HTTP instead */
954    if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
955	if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
956	    /* XXX HTTP PUT is not implemented, so try without the proxy */
957	    purl = NULL;
958    } else {
959	purl = NULL;
960    }
961
962    /* connect to server */
963    cd = _ftp_cached_connect(url, purl, flags);
964    if (purl)
965	fetchFreeURL(purl);
966    if (cd == NULL)
967	return NULL;
968
969    /* change directory */
970    if (_ftp_cwd(cd, url->doc) == -1)
971	return NULL;
972
973    /* initiate the transfer */
974    return _ftp_transfer(cd, CHECK_FLAG('a') ? "APPE" : "STOR",
975			 url->doc, O_WRONLY, url->offset, flags);
976}
977
978/*
979 * Get file stats
980 */
981int
982fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
983{
984    struct url *purl;
985    int cd;
986
987    /* get the proxy URL, and check if we should use HTTP instead */
988    if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
989	if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) {
990	    FILE *f;
991
992	    if ((f = _http_request(url, "HEAD", us, purl, flags)) == NULL)
993		return -1;
994	    fclose(f);
995	    return 0;
996	}
997    } else {
998	purl = NULL;
999    }
1000
1001    /* connect to server */
1002    cd = _ftp_cached_connect(url, purl, flags);
1003    if (purl)
1004	fetchFreeURL(purl);
1005    if (cd == NULL)
1006	return NULL;
1007
1008    /* change directory */
1009    if (_ftp_cwd(cd, url->doc) == -1)
1010	return -1;
1011
1012    /* stat file */
1013    return _ftp_stat(cd, url->doc, us);
1014}
1015
1016/*
1017 * List a directory
1018 */
1019extern void warnx(char *, ...);
1020struct url_ent *
1021fetchListFTP(struct url *url, char *flags)
1022{
1023    warnx("fetchListFTP(): not implemented");
1024    return NULL;
1025}
1026