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 77238 2001-05-26 19:37:15Z 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 <err.h>
64#include <errno.h>
65#include <fcntl.h>
66#include <netdb.h>
67#include <stdarg.h>
68#include <stdio.h>
69#include <stdlib.h>
70#include <string.h>
71#include <time.h>
72#include <unistd.h>
73
74#include "fetch.h"
75#include "common.h"
76#include "ftperr.h"
77
78#define FTP_ANONYMOUS_USER "anonymous"
79
80#define FTP_CONNECTION_ALREADY_OPEN 125
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_TRANSFER_COMPLETE 226
86#define FTP_PASSIVE_MODE 227
87#define FTP_LPASSIVE_MODE 228
88#define FTP_EPASSIVE_MODE 229
89#define FTP_LOGGED_IN 230
90#define FTP_FILE_ACTION_OK 250
91#define FTP_NEED_PASSWORD 331
92#define FTP_NEED_ACCOUNT 332
93#define FTP_FILE_OK 350
94#define FTP_SYNTAX_ERROR 500
95#define FTP_PROTOCOL_ERROR 999
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 if (isftpinfo(last_reply)) {
142 while (lr_length && !isftpreply(last_reply)) {
143 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
144 _fetch_syserr();
145 return -1;
146 }
147 }
148 }
149
150 while (lr_length && isspace(last_reply[lr_length-1]))
151 lr_length--;
152 last_reply[lr_length] = 0;
153
154 if (!isftpreply(last_reply)) {
155 _ftp_seterr(FTP_PROTOCOL_ERROR);
156 return -1;
157 }
158
159 last_code = (last_reply[0] - '0') * 100
160 + (last_reply[1] - '0') * 10
161 + (last_reply[2] - '0');
162
163 return last_code;
164}
165
166/*
167 * Send a command and check reply
168 */
169static int
170_ftp_cmd(int cd, const char *fmt, ...)
171{
172 va_list ap;
173 size_t len;
174 char *msg;
175 int r;
176
177 va_start(ap, fmt);
178 len = vasprintf(&msg, fmt, ap);
179 va_end(ap);
180
181 if (msg == NULL) {
182 errno = ENOMEM;
183 _fetch_syserr();
184 return -1;
185 }
186
187 r = _fetch_putln(cd, msg, len);
188 free(msg);
189
190 if (r == -1) {
191 _fetch_syserr();
192 return -1;
193 }
194
195 return _ftp_chkerr(cd);
196}
197
198/*
199 * Return a pointer to the filename part of a path
200 */
201static const char *
202_ftp_filename(const char *file)
203{
204 char *s;
205
206 if ((s = strrchr(file, '/')) == NULL)
207 return file;
208 else
209 return s + 1;
210}
211
212/*
213 * Change working directory to the directory that contains the
214 * specified file.
215 */
216static int
217_ftp_cwd(int cd, const char *file)
218{
219 char *s;
220 int e;
221
222 if ((s = strrchr(file, '/')) == NULL || s == file) {
223 e = _ftp_cmd(cd, "CWD /");
224 } else {
225 e = _ftp_cmd(cd, "CWD %.*s", s - file, file);
226 }
227 if (e != FTP_FILE_ACTION_OK) {
228 _ftp_seterr(e);
229 return -1;
230 }
231 return 0;
232}
233
234/*
235 * Request and parse file stats
236 */
237static int
238_ftp_stat(int cd, const char *file, struct url_stat *us)
239{
240 char *ln;
241 const char *s;
242 struct tm tm;
243 time_t t;
244 int e;
245
246 us->size = -1;
247 us->atime = us->mtime = 0;
248
249 if ((s = strrchr(file, '/')) == NULL)
250 s = file;
251 else
252 ++s;
253
254 if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) {
255 _ftp_seterr(e);
256 return -1;
257 }
258 for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
259 /* nothing */ ;
260 for (us->size = 0; *ln && isdigit(*ln); ln++)
261 us->size = us->size * 10 + *ln - '0';
262 if (*ln && !isspace(*ln)) {
263 _ftp_seterr(FTP_PROTOCOL_ERROR);
264 us->size = -1;
265 return -1;
266 }
267 if (us->size == 0)
268 us->size = -1;
269 DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
270
271 if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) {
272 _ftp_seterr(e);
273 return -1;
274 }
275 for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
276 /* nothing */ ;
277 switch (strspn(ln, "0123456789")) {
278 case 14:
279 break;
280 case 15:
281 ln++;
282 ln[0] = '2';
283 ln[1] = '0';
284 break;
285 default:
286 _ftp_seterr(FTP_PROTOCOL_ERROR);
287 return -1;
288 }
289 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
290 &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
291 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
292 _ftp_seterr(FTP_PROTOCOL_ERROR);
293 return -1;
294 }
295 tm.tm_mon--;
296 tm.tm_year -= 1900;
297 tm.tm_isdst = -1;
298 t = timegm(&tm);
299 if (t == (time_t)-1)
300 t = time(NULL);
301 us->mtime = t;
302 us->atime = t;
303 DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
304 "%02d:%02d:%02d\033[m]\n",
305 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
306 tm.tm_hour, tm.tm_min, tm.tm_sec));
307 return 0;
308}
309
310/*
311 * I/O functions for FTP
312 */
313struct ftpio {
314 int csd; /* Control socket descriptor */
315 int dsd; /* Data socket descriptor */
316 int dir; /* Direction */
317 int eof; /* EOF reached */
318 int err; /* Error code */
319};
320
321static int _ftp_readfn(void *, char *, int);
322static int _ftp_writefn(void *, const char *, int);
323static fpos_t _ftp_seekfn(void *, fpos_t, int);
324static int _ftp_closefn(void *);
325
326static int
327_ftp_readfn(void *v, char *buf, int len)
328{
329 struct ftpio *io;
330 int r;
331
332 io = (struct ftpio *)v;
333 if (io == NULL) {
334 errno = EBADF;
335 return -1;
336 }
337 if (io->csd == -1 || io->dsd == -1 || io->dir == O_WRONLY) {
338 errno = EBADF;
339 return -1;
340 }
341 if (io->err) {
342 errno = io->err;
343 return -1;
344 }
345 if (io->eof)
346 return 0;
347 r = read(io->dsd, buf, len);
348 if (r > 0)
349 return r;
350 if (r == 0) {
351 io->eof = 1;
352 return _ftp_closefn(v);
353 }
354 if (errno != EINTR)
355 io->err = errno;
356 return -1;
357}
358
359static int
360_ftp_writefn(void *v, const char *buf, int len)
361{
362 struct ftpio *io;
363 int w;
364
365 io = (struct ftpio *)v;
366 if (io == NULL) {
367 errno = EBADF;
368 return -1;
369 }
370 if (io->csd == -1 || io->dsd == -1 || io->dir == O_RDONLY) {
371 errno = EBADF;
372 return -1;
373 }
374 if (io->err) {
375 errno = io->err;
376 return -1;
377 }
378 w = write(io->dsd, buf, len);
379 if (w >= 0)
380 return w;
381 if (errno != EINTR)
382 io->err = errno;
383 return -1;
384}
385
386static fpos_t
387_ftp_seekfn(void *v, fpos_t pos, int whence)
388{
389 struct ftpio *io;
390
391 io = (struct ftpio *)v;
392 if (io == NULL) {
393 errno = EBADF;
394 return -1;
395 }
396 errno = ESPIPE;
397 return -1;
398}
399
400static int
401_ftp_closefn(void *v)
402{
403 struct ftpio *io;
404 int r;
405
406 io = (struct ftpio *)v;
407 if (io == NULL) {
408 errno = EBADF;
409 return -1;
410 }
411 if (io->dir == -1)
412 return 0;
413 if (io->csd == -1 || io->dsd == -1) {
414 errno = EBADF;
415 return -1;
416 }
417 close(io->dsd);
418 io->dir = -1;
419 io->dsd = -1;
420 DEBUG(fprintf(stderr, "Waiting for final status\n"));
421 r = _ftp_chkerr(io->csd);
422 close(io->csd);
423 free(io);
424 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1;
425}
426
427static FILE *
428_ftp_setup(int csd, int dsd, int mode)
429{
430 struct ftpio *io;
431 FILE *f;
432
433 if ((io = malloc(sizeof *io)) == NULL)
434 return NULL;
435 io->csd = dup(csd);
436 io->dsd = dsd;
437 io->dir = mode;
438 io->eof = io->err = 0;
439 f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn);
440 if (f == NULL)
441 free(io);
442 return f;
443}
444
445/*
446 * Transfer file
447 */
448static FILE *
449_ftp_transfer(int cd, const char *oper, const char *file,
450 int mode, off_t offset, const char *flags)
451{
452 struct sockaddr_storage sin;
453 struct sockaddr_in6 *sin6;
454 struct sockaddr_in *sin4;
455 int low, pasv, verbose;
456 int e, sd = -1;
457 socklen_t l;
458 char *s;
459 FILE *df;
460
461 /* check flags */
462 low = CHECK_FLAG('l');
463 pasv = CHECK_FLAG('p');
464 verbose = CHECK_FLAG('v');
465
466 /* passive mode */
467 if (!pasv)
468 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL &&
469 strncasecmp(s, "no", 2) != 0);
470
471 /* find our own address, bind, and listen */
472 l = sizeof sin;
473 if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
474 goto sysouch;
475 if (sin.ss_family == AF_INET6)
476 unmappedaddr((struct sockaddr_in6 *)&sin);
477
478 /* open data socket */
479 if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
480 _fetch_syserr();
481 return NULL;
482 }
483
484 if (pasv) {
485 u_char addr[64];
486 char *ln, *p;
487 int i;
488 int port;
489
490 /* send PASV command */
491 if (verbose)
492 _fetch_info("setting passive mode");
493 switch (sin.ss_family) {
494 case AF_INET:
495 if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
496 goto ouch;
497 break;
498 case AF_INET6:
499 if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
500 if (e == -1)
501 goto ouch;
502 if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
503 goto ouch;
504 }
505 break;
506 default:
507 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
508 goto ouch;
509 }
510
511 /*
512 * Find address and port number. The reply to the PASV command
513 * is IMHO the one and only weak point in the FTP protocol.
514 */
515 ln = last_reply;
516 switch (e) {
517 case FTP_PASSIVE_MODE:
518 case FTP_LPASSIVE_MODE:
519 for (p = ln + 3; *p && !isdigit(*p); p++)
520 /* nothing */ ;
521 if (!*p) {
522 e = FTP_PROTOCOL_ERROR;
523 goto ouch;
524 }
525 l = (e == FTP_PASSIVE_MODE ? 6 : 21);
526 for (i = 0; *p && i < l; i++, p++)
527 addr[i] = strtol(p, &p, 10);
528 if (i < l) {
529 e = FTP_PROTOCOL_ERROR;
530 goto ouch;
531 }
532 break;
533 case FTP_EPASSIVE_MODE:
534 for (p = ln + 3; *p && *p != '('; p++)
535 /* nothing */ ;
536 if (!*p) {
537 e = FTP_PROTOCOL_ERROR;
538 goto ouch;
539 }
540 ++p;
541 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
542 &port, &addr[3]) != 5 ||
543 addr[0] != addr[1] ||
544 addr[0] != addr[2] || addr[0] != addr[3]) {
545 e = FTP_PROTOCOL_ERROR;
546 goto ouch;
547 }
548 break;
549 }
550
551 /* seek to required offset */
552 if (offset)
553 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
554 goto sysouch;
555
556 /* construct sockaddr for data socket */
557 l = sizeof sin;
558 if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
559 goto sysouch;
560 if (sin.ss_family == AF_INET6)
561 unmappedaddr((struct sockaddr_in6 *)&sin);
562 switch (sin.ss_family) {
563 case AF_INET6:
564 sin6 = (struct sockaddr_in6 *)&sin;
565 if (e == FTP_EPASSIVE_MODE)
566 sin6->sin6_port = htons(port);
567 else {
568 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
569 bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
570 }
571 break;
572 case AF_INET:
573 sin4 = (struct sockaddr_in *)&sin;
574 if (e == FTP_EPASSIVE_MODE)
575 sin4->sin_port = htons(port);
576 else {
577 bcopy(addr, (char *)&sin4->sin_addr, 4);
578 bcopy(addr + 4, (char *)&sin4->sin_port, 2);
579 }
580 break;
581 default:
582 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
583 break;
584 }
585
586 /* connect to data port */
587 if (verbose)
588 _fetch_info("opening data connection");
589 if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
590 goto sysouch;
591
592 /* make the server initiate the transfer */
593 if (verbose)
594 _fetch_info("initiating transfer");
595 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
596 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
597 goto ouch;
598
599 } else {
600 u_int32_t a;
601 u_short p;
602 int arg, d;
603 char *ap;
604 char hname[INET6_ADDRSTRLEN];
605
606 switch (sin.ss_family) {
607 case AF_INET6:
608 ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
609#ifdef IPV6_PORTRANGE
610 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH;
611 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
612 (char *)&arg, sizeof(arg)) == -1)
613 goto sysouch;
614#endif
615 break;
616 case AF_INET:
617 ((struct sockaddr_in *)&sin)->sin_port = 0;
618 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH;
619 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
620 (char *)&arg, sizeof arg) == -1)
621 goto sysouch;
622 break;
623 }
624 if (verbose)
625 _fetch_info("binding data socket");
626 if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
627 goto sysouch;
628 if (listen(sd, 1) == -1)
629 goto sysouch;
630
631 /* find what port we're on and tell the server */
632 if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
633 goto sysouch;
634 switch (sin.ss_family) {
635 case AF_INET:
636 sin4 = (struct sockaddr_in *)&sin;
637 a = ntohl(sin4->sin_addr.s_addr);
638 p = ntohs(sin4->sin_port);
639 e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
640 (a >> 24) & 0xff, (a >> 16) & 0xff,
641 (a >> 8) & 0xff, a & 0xff,
642 (p >> 8) & 0xff, p & 0xff);
643 break;
644 case AF_INET6:
645#define UC(b) (((int)b)&0xff)
646 e = -1;
647 sin6 = (struct sockaddr_in6 *)&sin;
648 if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
649 hname, sizeof(hname),
650 NULL, 0, NI_NUMERICHOST) == 0) {
651 e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
652 htons(sin6->sin6_port));
653 if (e == -1)
654 goto ouch;
655 }
656 if (e != FTP_OK) {
657 ap = (char *)&sin6->sin6_addr;
658 e = _ftp_cmd(cd,
659 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
660 6, 16,
661 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
662 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
663 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
664 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
665 2,
666 (ntohs(sin6->sin6_port) >> 8) & 0xff,
667 ntohs(sin6->sin6_port) & 0xff);
668 }
669 break;
670 default:
671 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
672 goto ouch;
673 }
674 if (e != FTP_OK)
675 goto ouch;
676
677 /* seek to required offset */
678 if (offset)
679 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
680 goto sysouch;
681
682 /* make the server initiate the transfer */
683 if (verbose)
684 _fetch_info("initiating transfer");
685 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
686 if (e != FTP_OPEN_DATA_CONNECTION)
687 goto ouch;
688
689 /* accept the incoming connection and go to town */
690 if ((d = accept(sd, NULL, NULL)) == -1)
691 goto sysouch;
692 close(sd);
693 sd = d;
694 }
695
696 if ((df = _ftp_setup(cd, sd, mode)) == NULL)
697 goto sysouch;
698 return df;
699
700sysouch:
701 _fetch_syserr();
702 if (sd >= 0)
703 close(sd);
704 return NULL;
705
706ouch:
707 if (e != -1)
708 _ftp_seterr(e);
709 if (sd >= 0)
710 close(sd);
711 return NULL;
712}
713
714/*
715 * Authenticate
716 */
717static int
718_ftp_authenticate(int cd, struct url *url, struct url *purl)
719{
720 char *user, *pwd, *logname;
721 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
722 int e, len;
723
724 /* XXX FTP_AUTH, and maybe .netrc */
725
726 /* send user name and password */
727 user = url->user;
728 if (!user || !*user)
729 user = getenv("FTP_LOGIN");
730 if (!user || !*user)
731 user = FTP_ANONYMOUS_USER;
732 if (purl && url->port == _fetch_default_port(url->scheme))
733 e = _ftp_cmd(cd, "USER %s@%s", user, url->host);
734 else if (purl)
735 e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port);
736 else
737 e = _ftp_cmd(cd, "USER %s", user);
738
739 /* did the server request a password? */
740 if (e == FTP_NEED_PASSWORD) {
741 pwd = url->pwd;
742 if (!pwd || !*pwd)
743 pwd = getenv("FTP_PASSWORD");
744 if (!pwd || !*pwd) {
745 if ((logname = getlogin()) == 0)
746 logname = FTP_ANONYMOUS_USER;
747 len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname);
748 gethostname(pbuf + len, sizeof pbuf - len);
749 pwd = pbuf;
750 }
751 e = _ftp_cmd(cd, "PASS %s", pwd);
752 }
753
754 return e;
755}
756
757/*
758 * Log on to FTP server
759 */
760static int
761_ftp_connect(struct url *url, struct url *purl, const char *flags)
762{
763 int cd, e, direct, verbose;
764#ifdef INET6
765 int af = AF_UNSPEC;
766#else
767 int af = AF_INET;
768#endif
769
770 direct = CHECK_FLAG('d');
771 verbose = CHECK_FLAG('v');
772 if (CHECK_FLAG('4'))
773 af = AF_INET;
774 else if (CHECK_FLAG('6'))
775 af = AF_INET6;
776
777 if (direct)
778 purl = NULL;
779
780 /* check for proxy */
781 if (purl) {
782 /* XXX proxy authentication! */
783 cd = _fetch_connect(purl->host, purl->port, af, verbose);
784 } else {
785 /* no proxy, go straight to target */
786 cd = _fetch_connect(url->host, url->port, af, verbose);
787 purl = NULL;
788 }
789
790 /* check connection */
791 if (cd == -1) {
792 _fetch_syserr();
793 return NULL;
794 }
795
796 /* expect welcome message */
797 if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
798 goto fouch;
799
800 /* authenticate */
801 if ((e = _ftp_authenticate(cd, url, purl)) != FTP_LOGGED_IN)
802 goto fouch;
803
804 /* might as well select mode and type at once */
805#ifdef FTP_FORCE_STREAM_MODE
806 if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
807 goto fouch;
808#endif
809 if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
810 goto fouch;
811
812 /* done */
813 return cd;
814
815fouch:
816 if (e != -1)
817 _ftp_seterr(e);
818 close(cd);
819 return NULL;
820}
821
822/*
823 * Disconnect from server
824 */
825static void
826_ftp_disconnect(int cd)
827{
828 (void)_ftp_cmd(cd, "QUIT");
829 close(cd);
830}
831
832/*
833 * Check if we're already connected
834 */
835static int
836_ftp_isconnected(struct url *url)
837{
838 return (cached_socket
839 && (strcmp(url->host, cached_host.host) == 0)
840 && (strcmp(url->user, cached_host.user) == 0)
841 && (strcmp(url->pwd, cached_host.pwd) == 0)
842 && (url->port == cached_host.port));
843}
844
845/*
846 * Check the cache, reconnect if no luck
847 */
848static int
849_ftp_cached_connect(struct url *url, struct url *purl, const char *flags)
850{
851 int e, cd;
852
853 cd = -1;
854
855 /* set default port */
856 if (!url->port)
857 url->port = _fetch_default_port(url->scheme);
858
859 /* try to use previously cached connection */
860 if (_ftp_isconnected(url)) {
861 e = _ftp_cmd(cached_socket, "NOOP");
862 if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
863 return cached_socket;
864 }
865
866 /* connect to server */
867 if ((cd = _ftp_connect(url, purl, flags)) == -1)
868 return -1;
869 if (cached_socket)
870 _ftp_disconnect(cached_socket);
871 cached_socket = cd;
872 memcpy(&cached_host, url, sizeof *url);
873 return cd;
874}
875
876/*
877 * Check the proxy settings
878 */
879static struct url *
880_ftp_get_proxy(void)
881{
882 struct url *purl;
883 char *p;
884
885 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) ||
886 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
887 *p && (purl = fetchParseURL(p)) != NULL) {
888 if (!*purl->scheme) {
889 if (getenv("FTP_PROXY") || getenv("ftp_proxy"))
890 strcpy(purl->scheme, SCHEME_FTP);
891 else
892 strcpy(purl->scheme, SCHEME_HTTP);
893 }
894 if (!purl->port)
895 purl->port = _fetch_default_proxy_port(purl->scheme);
896 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 ||
897 strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
898 return purl;
899 fetchFreeURL(purl);
900 }
901 return NULL;
902}
903
904/*
905 * Get and stat file
906 */
907FILE *
908fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags)
909{
910 struct url *purl;
911 int cd;
912
913 /* get the proxy URL, and check if we should use HTTP instead */
914 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
915 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
916 return _http_request(url, "GET", us, purl, flags);
917 } else {
918 purl = NULL;
919 }
920
921 /* connect to server */
922 cd = _ftp_cached_connect(url, purl, flags);
923 if (purl)
924 fetchFreeURL(purl);
925 if (cd == NULL)
926 return NULL;
927
928 /* change directory */
929 if (_ftp_cwd(cd, url->doc) == -1)
930 return NULL;
931
932 /* stat file */
933 if (us && _ftp_stat(cd, url->doc, us) == -1
934 && fetchLastErrCode != FETCH_PROTO
935 && fetchLastErrCode != FETCH_UNAVAIL)
936 return NULL;
937
938 /* initiate the transfer */
939 return _ftp_transfer(cd, "RETR", url->doc, O_RDONLY, url->offset, flags);
940}
941
942/*
943 * Get file
944 */
945FILE *
946fetchGetFTP(struct url *url, const char *flags)
947{
948 return fetchXGetFTP(url, NULL, flags);
949}
950
951/*
952 * Put file
953 */
954FILE *
955fetchPutFTP(struct url *url, const char *flags)
956{
957 struct url *purl;
958 int cd;
959
960 /* get the proxy URL, and check if we should use HTTP instead */
961 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
962 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
963 /* XXX HTTP PUT is not implemented, so try without the proxy */
964 purl = NULL;
965 } else {
966 purl = NULL;
967 }
968
969 /* connect to server */
970 cd = _ftp_cached_connect(url, purl, flags);
971 if (purl)
972 fetchFreeURL(purl);
973 if (cd == NULL)
974 return NULL;
975
976 /* change directory */
977 if (_ftp_cwd(cd, url->doc) == -1)
978 return NULL;
979
980 /* initiate the transfer */
981 return _ftp_transfer(cd, CHECK_FLAG('a') ? "APPE" : "STOR",
982 url->doc, O_WRONLY, url->offset, flags);
983}
984
985/*
986 * Get file stats
987 */
988int
989fetchStatFTP(struct url *url, struct url_stat *us, const char *flags)
990{
991 struct url *purl;
992 int cd;
993
994 /* get the proxy URL, and check if we should use HTTP instead */
995 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
996 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) {
997 FILE *f;
998
999 if ((f = _http_request(url, "HEAD", us, purl, flags)) == NULL)
1000 return -1;
1001 fclose(f);
1002 return 0;
1003 }
1004 } else {
1005 purl = NULL;
1006 }
1007
1008 /* connect to server */
1009 cd = _ftp_cached_connect(url, purl, flags);
1010 if (purl)
1011 fetchFreeURL(purl);
1012 if (cd == NULL)
1013 return NULL;
1014
1015 /* change directory */
1016 if (_ftp_cwd(cd, url->doc) == -1)
1017 return -1;
1018
1019 /* stat file */
1020 return _ftp_stat(cd, url->doc, us);
1021}
1022
1023/*
1024 * List a directory
1025 */
1026struct url_ent *
1027fetchListFTP(struct url *url, const char *flags)
1028{
1029 warnx("fetchListFTP(): not implemented");
1030 return NULL;
1031}
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 77238 2001-05-26 19:37:15Z 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 <err.h>
64#include <errno.h>
65#include <fcntl.h>
66#include <netdb.h>
67#include <stdarg.h>
68#include <stdio.h>
69#include <stdlib.h>
70#include <string.h>
71#include <time.h>
72#include <unistd.h>
73
74#include "fetch.h"
75#include "common.h"
76#include "ftperr.h"
77
78#define FTP_ANONYMOUS_USER "anonymous"
79
80#define FTP_CONNECTION_ALREADY_OPEN 125
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_TRANSFER_COMPLETE 226
86#define FTP_PASSIVE_MODE 227
87#define FTP_LPASSIVE_MODE 228
88#define FTP_EPASSIVE_MODE 229
89#define FTP_LOGGED_IN 230
90#define FTP_FILE_ACTION_OK 250
91#define FTP_NEED_PASSWORD 331
92#define FTP_NEED_ACCOUNT 332
93#define FTP_FILE_OK 350
94#define FTP_SYNTAX_ERROR 500
95#define FTP_PROTOCOL_ERROR 999
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 if (isftpinfo(last_reply)) {
142 while (lr_length && !isftpreply(last_reply)) {
143 if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
144 _fetch_syserr();
145 return -1;
146 }
147 }
148 }
149
150 while (lr_length && isspace(last_reply[lr_length-1]))
151 lr_length--;
152 last_reply[lr_length] = 0;
153
154 if (!isftpreply(last_reply)) {
155 _ftp_seterr(FTP_PROTOCOL_ERROR);
156 return -1;
157 }
158
159 last_code = (last_reply[0] - '0') * 100
160 + (last_reply[1] - '0') * 10
161 + (last_reply[2] - '0');
162
163 return last_code;
164}
165
166/*
167 * Send a command and check reply
168 */
169static int
170_ftp_cmd(int cd, const char *fmt, ...)
171{
172 va_list ap;
173 size_t len;
174 char *msg;
175 int r;
176
177 va_start(ap, fmt);
178 len = vasprintf(&msg, fmt, ap);
179 va_end(ap);
180
181 if (msg == NULL) {
182 errno = ENOMEM;
183 _fetch_syserr();
184 return -1;
185 }
186
187 r = _fetch_putln(cd, msg, len);
188 free(msg);
189
190 if (r == -1) {
191 _fetch_syserr();
192 return -1;
193 }
194
195 return _ftp_chkerr(cd);
196}
197
198/*
199 * Return a pointer to the filename part of a path
200 */
201static const char *
202_ftp_filename(const char *file)
203{
204 char *s;
205
206 if ((s = strrchr(file, '/')) == NULL)
207 return file;
208 else
209 return s + 1;
210}
211
212/*
213 * Change working directory to the directory that contains the
214 * specified file.
215 */
216static int
217_ftp_cwd(int cd, const char *file)
218{
219 char *s;
220 int e;
221
222 if ((s = strrchr(file, '/')) == NULL || s == file) {
223 e = _ftp_cmd(cd, "CWD /");
224 } else {
225 e = _ftp_cmd(cd, "CWD %.*s", s - file, file);
226 }
227 if (e != FTP_FILE_ACTION_OK) {
228 _ftp_seterr(e);
229 return -1;
230 }
231 return 0;
232}
233
234/*
235 * Request and parse file stats
236 */
237static int
238_ftp_stat(int cd, const char *file, struct url_stat *us)
239{
240 char *ln;
241 const char *s;
242 struct tm tm;
243 time_t t;
244 int e;
245
246 us->size = -1;
247 us->atime = us->mtime = 0;
248
249 if ((s = strrchr(file, '/')) == NULL)
250 s = file;
251 else
252 ++s;
253
254 if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) {
255 _ftp_seterr(e);
256 return -1;
257 }
258 for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
259 /* nothing */ ;
260 for (us->size = 0; *ln && isdigit(*ln); ln++)
261 us->size = us->size * 10 + *ln - '0';
262 if (*ln && !isspace(*ln)) {
263 _ftp_seterr(FTP_PROTOCOL_ERROR);
264 us->size = -1;
265 return -1;
266 }
267 if (us->size == 0)
268 us->size = -1;
269 DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
270
271 if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) {
272 _ftp_seterr(e);
273 return -1;
274 }
275 for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
276 /* nothing */ ;
277 switch (strspn(ln, "0123456789")) {
278 case 14:
279 break;
280 case 15:
281 ln++;
282 ln[0] = '2';
283 ln[1] = '0';
284 break;
285 default:
286 _ftp_seterr(FTP_PROTOCOL_ERROR);
287 return -1;
288 }
289 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
290 &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
291 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
292 _ftp_seterr(FTP_PROTOCOL_ERROR);
293 return -1;
294 }
295 tm.tm_mon--;
296 tm.tm_year -= 1900;
297 tm.tm_isdst = -1;
298 t = timegm(&tm);
299 if (t == (time_t)-1)
300 t = time(NULL);
301 us->mtime = t;
302 us->atime = t;
303 DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
304 "%02d:%02d:%02d\033[m]\n",
305 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
306 tm.tm_hour, tm.tm_min, tm.tm_sec));
307 return 0;
308}
309
310/*
311 * I/O functions for FTP
312 */
313struct ftpio {
314 int csd; /* Control socket descriptor */
315 int dsd; /* Data socket descriptor */
316 int dir; /* Direction */
317 int eof; /* EOF reached */
318 int err; /* Error code */
319};
320
321static int _ftp_readfn(void *, char *, int);
322static int _ftp_writefn(void *, const char *, int);
323static fpos_t _ftp_seekfn(void *, fpos_t, int);
324static int _ftp_closefn(void *);
325
326static int
327_ftp_readfn(void *v, char *buf, int len)
328{
329 struct ftpio *io;
330 int r;
331
332 io = (struct ftpio *)v;
333 if (io == NULL) {
334 errno = EBADF;
335 return -1;
336 }
337 if (io->csd == -1 || io->dsd == -1 || io->dir == O_WRONLY) {
338 errno = EBADF;
339 return -1;
340 }
341 if (io->err) {
342 errno = io->err;
343 return -1;
344 }
345 if (io->eof)
346 return 0;
347 r = read(io->dsd, buf, len);
348 if (r > 0)
349 return r;
350 if (r == 0) {
351 io->eof = 1;
352 return _ftp_closefn(v);
353 }
354 if (errno != EINTR)
355 io->err = errno;
356 return -1;
357}
358
359static int
360_ftp_writefn(void *v, const char *buf, int len)
361{
362 struct ftpio *io;
363 int w;
364
365 io = (struct ftpio *)v;
366 if (io == NULL) {
367 errno = EBADF;
368 return -1;
369 }
370 if (io->csd == -1 || io->dsd == -1 || io->dir == O_RDONLY) {
371 errno = EBADF;
372 return -1;
373 }
374 if (io->err) {
375 errno = io->err;
376 return -1;
377 }
378 w = write(io->dsd, buf, len);
379 if (w >= 0)
380 return w;
381 if (errno != EINTR)
382 io->err = errno;
383 return -1;
384}
385
386static fpos_t
387_ftp_seekfn(void *v, fpos_t pos, int whence)
388{
389 struct ftpio *io;
390
391 io = (struct ftpio *)v;
392 if (io == NULL) {
393 errno = EBADF;
394 return -1;
395 }
396 errno = ESPIPE;
397 return -1;
398}
399
400static int
401_ftp_closefn(void *v)
402{
403 struct ftpio *io;
404 int r;
405
406 io = (struct ftpio *)v;
407 if (io == NULL) {
408 errno = EBADF;
409 return -1;
410 }
411 if (io->dir == -1)
412 return 0;
413 if (io->csd == -1 || io->dsd == -1) {
414 errno = EBADF;
415 return -1;
416 }
417 close(io->dsd);
418 io->dir = -1;
419 io->dsd = -1;
420 DEBUG(fprintf(stderr, "Waiting for final status\n"));
421 r = _ftp_chkerr(io->csd);
422 close(io->csd);
423 free(io);
424 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1;
425}
426
427static FILE *
428_ftp_setup(int csd, int dsd, int mode)
429{
430 struct ftpio *io;
431 FILE *f;
432
433 if ((io = malloc(sizeof *io)) == NULL)
434 return NULL;
435 io->csd = dup(csd);
436 io->dsd = dsd;
437 io->dir = mode;
438 io->eof = io->err = 0;
439 f = funopen(io, _ftp_readfn, _ftp_writefn, _ftp_seekfn, _ftp_closefn);
440 if (f == NULL)
441 free(io);
442 return f;
443}
444
445/*
446 * Transfer file
447 */
448static FILE *
449_ftp_transfer(int cd, const char *oper, const char *file,
450 int mode, off_t offset, const char *flags)
451{
452 struct sockaddr_storage sin;
453 struct sockaddr_in6 *sin6;
454 struct sockaddr_in *sin4;
455 int low, pasv, verbose;
456 int e, sd = -1;
457 socklen_t l;
458 char *s;
459 FILE *df;
460
461 /* check flags */
462 low = CHECK_FLAG('l');
463 pasv = CHECK_FLAG('p');
464 verbose = CHECK_FLAG('v');
465
466 /* passive mode */
467 if (!pasv)
468 pasv = ((s = getenv("FTP_PASSIVE_MODE")) != NULL &&
469 strncasecmp(s, "no", 2) != 0);
470
471 /* find our own address, bind, and listen */
472 l = sizeof sin;
473 if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
474 goto sysouch;
475 if (sin.ss_family == AF_INET6)
476 unmappedaddr((struct sockaddr_in6 *)&sin);
477
478 /* open data socket */
479 if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
480 _fetch_syserr();
481 return NULL;
482 }
483
484 if (pasv) {
485 u_char addr[64];
486 char *ln, *p;
487 int i;
488 int port;
489
490 /* send PASV command */
491 if (verbose)
492 _fetch_info("setting passive mode");
493 switch (sin.ss_family) {
494 case AF_INET:
495 if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
496 goto ouch;
497 break;
498 case AF_INET6:
499 if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
500 if (e == -1)
501 goto ouch;
502 if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
503 goto ouch;
504 }
505 break;
506 default:
507 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
508 goto ouch;
509 }
510
511 /*
512 * Find address and port number. The reply to the PASV command
513 * is IMHO the one and only weak point in the FTP protocol.
514 */
515 ln = last_reply;
516 switch (e) {
517 case FTP_PASSIVE_MODE:
518 case FTP_LPASSIVE_MODE:
519 for (p = ln + 3; *p && !isdigit(*p); p++)
520 /* nothing */ ;
521 if (!*p) {
522 e = FTP_PROTOCOL_ERROR;
523 goto ouch;
524 }
525 l = (e == FTP_PASSIVE_MODE ? 6 : 21);
526 for (i = 0; *p && i < l; i++, p++)
527 addr[i] = strtol(p, &p, 10);
528 if (i < l) {
529 e = FTP_PROTOCOL_ERROR;
530 goto ouch;
531 }
532 break;
533 case FTP_EPASSIVE_MODE:
534 for (p = ln + 3; *p && *p != '('; p++)
535 /* nothing */ ;
536 if (!*p) {
537 e = FTP_PROTOCOL_ERROR;
538 goto ouch;
539 }
540 ++p;
541 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
542 &port, &addr[3]) != 5 ||
543 addr[0] != addr[1] ||
544 addr[0] != addr[2] || addr[0] != addr[3]) {
545 e = FTP_PROTOCOL_ERROR;
546 goto ouch;
547 }
548 break;
549 }
550
551 /* seek to required offset */
552 if (offset)
553 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
554 goto sysouch;
555
556 /* construct sockaddr for data socket */
557 l = sizeof sin;
558 if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
559 goto sysouch;
560 if (sin.ss_family == AF_INET6)
561 unmappedaddr((struct sockaddr_in6 *)&sin);
562 switch (sin.ss_family) {
563 case AF_INET6:
564 sin6 = (struct sockaddr_in6 *)&sin;
565 if (e == FTP_EPASSIVE_MODE)
566 sin6->sin6_port = htons(port);
567 else {
568 bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
569 bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
570 }
571 break;
572 case AF_INET:
573 sin4 = (struct sockaddr_in *)&sin;
574 if (e == FTP_EPASSIVE_MODE)
575 sin4->sin_port = htons(port);
576 else {
577 bcopy(addr, (char *)&sin4->sin_addr, 4);
578 bcopy(addr + 4, (char *)&sin4->sin_port, 2);
579 }
580 break;
581 default:
582 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
583 break;
584 }
585
586 /* connect to data port */
587 if (verbose)
588 _fetch_info("opening data connection");
589 if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
590 goto sysouch;
591
592 /* make the server initiate the transfer */
593 if (verbose)
594 _fetch_info("initiating transfer");
595 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
596 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
597 goto ouch;
598
599 } else {
600 u_int32_t a;
601 u_short p;
602 int arg, d;
603 char *ap;
604 char hname[INET6_ADDRSTRLEN];
605
606 switch (sin.ss_family) {
607 case AF_INET6:
608 ((struct sockaddr_in6 *)&sin)->sin6_port = 0;
609#ifdef IPV6_PORTRANGE
610 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH;
611 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
612 (char *)&arg, sizeof(arg)) == -1)
613 goto sysouch;
614#endif
615 break;
616 case AF_INET:
617 ((struct sockaddr_in *)&sin)->sin_port = 0;
618 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH;
619 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
620 (char *)&arg, sizeof arg) == -1)
621 goto sysouch;
622 break;
623 }
624 if (verbose)
625 _fetch_info("binding data socket");
626 if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
627 goto sysouch;
628 if (listen(sd, 1) == -1)
629 goto sysouch;
630
631 /* find what port we're on and tell the server */
632 if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
633 goto sysouch;
634 switch (sin.ss_family) {
635 case AF_INET:
636 sin4 = (struct sockaddr_in *)&sin;
637 a = ntohl(sin4->sin_addr.s_addr);
638 p = ntohs(sin4->sin_port);
639 e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
640 (a >> 24) & 0xff, (a >> 16) & 0xff,
641 (a >> 8) & 0xff, a & 0xff,
642 (p >> 8) & 0xff, p & 0xff);
643 break;
644 case AF_INET6:
645#define UC(b) (((int)b)&0xff)
646 e = -1;
647 sin6 = (struct sockaddr_in6 *)&sin;
648 if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
649 hname, sizeof(hname),
650 NULL, 0, NI_NUMERICHOST) == 0) {
651 e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
652 htons(sin6->sin6_port));
653 if (e == -1)
654 goto ouch;
655 }
656 if (e != FTP_OK) {
657 ap = (char *)&sin6->sin6_addr;
658 e = _ftp_cmd(cd,
659 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
660 6, 16,
661 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
662 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
663 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
664 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
665 2,
666 (ntohs(sin6->sin6_port) >> 8) & 0xff,
667 ntohs(sin6->sin6_port) & 0xff);
668 }
669 break;
670 default:
671 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
672 goto ouch;
673 }
674 if (e != FTP_OK)
675 goto ouch;
676
677 /* seek to required offset */
678 if (offset)
679 if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
680 goto sysouch;
681
682 /* make the server initiate the transfer */
683 if (verbose)
684 _fetch_info("initiating transfer");
685 e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
686 if (e != FTP_OPEN_DATA_CONNECTION)
687 goto ouch;
688
689 /* accept the incoming connection and go to town */
690 if ((d = accept(sd, NULL, NULL)) == -1)
691 goto sysouch;
692 close(sd);
693 sd = d;
694 }
695
696 if ((df = _ftp_setup(cd, sd, mode)) == NULL)
697 goto sysouch;
698 return df;
699
700sysouch:
701 _fetch_syserr();
702 if (sd >= 0)
703 close(sd);
704 return NULL;
705
706ouch:
707 if (e != -1)
708 _ftp_seterr(e);
709 if (sd >= 0)
710 close(sd);
711 return NULL;
712}
713
714/*
715 * Authenticate
716 */
717static int
718_ftp_authenticate(int cd, struct url *url, struct url *purl)
719{
720 char *user, *pwd, *logname;
721 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
722 int e, len;
723
724 /* XXX FTP_AUTH, and maybe .netrc */
725
726 /* send user name and password */
727 user = url->user;
728 if (!user || !*user)
729 user = getenv("FTP_LOGIN");
730 if (!user || !*user)
731 user = FTP_ANONYMOUS_USER;
732 if (purl && url->port == _fetch_default_port(url->scheme))
733 e = _ftp_cmd(cd, "USER %s@%s", user, url->host);
734 else if (purl)
735 e = _ftp_cmd(cd, "USER %s@%s@%d", user, url->host, url->port);
736 else
737 e = _ftp_cmd(cd, "USER %s", user);
738
739 /* did the server request a password? */
740 if (e == FTP_NEED_PASSWORD) {
741 pwd = url->pwd;
742 if (!pwd || !*pwd)
743 pwd = getenv("FTP_PASSWORD");
744 if (!pwd || !*pwd) {
745 if ((logname = getlogin()) == 0)
746 logname = FTP_ANONYMOUS_USER;
747 len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname);
748 gethostname(pbuf + len, sizeof pbuf - len);
749 pwd = pbuf;
750 }
751 e = _ftp_cmd(cd, "PASS %s", pwd);
752 }
753
754 return e;
755}
756
757/*
758 * Log on to FTP server
759 */
760static int
761_ftp_connect(struct url *url, struct url *purl, const char *flags)
762{
763 int cd, e, direct, verbose;
764#ifdef INET6
765 int af = AF_UNSPEC;
766#else
767 int af = AF_INET;
768#endif
769
770 direct = CHECK_FLAG('d');
771 verbose = CHECK_FLAG('v');
772 if (CHECK_FLAG('4'))
773 af = AF_INET;
774 else if (CHECK_FLAG('6'))
775 af = AF_INET6;
776
777 if (direct)
778 purl = NULL;
779
780 /* check for proxy */
781 if (purl) {
782 /* XXX proxy authentication! */
783 cd = _fetch_connect(purl->host, purl->port, af, verbose);
784 } else {
785 /* no proxy, go straight to target */
786 cd = _fetch_connect(url->host, url->port, af, verbose);
787 purl = NULL;
788 }
789
790 /* check connection */
791 if (cd == -1) {
792 _fetch_syserr();
793 return NULL;
794 }
795
796 /* expect welcome message */
797 if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
798 goto fouch;
799
800 /* authenticate */
801 if ((e = _ftp_authenticate(cd, url, purl)) != FTP_LOGGED_IN)
802 goto fouch;
803
804 /* might as well select mode and type at once */
805#ifdef FTP_FORCE_STREAM_MODE
806 if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
807 goto fouch;
808#endif
809 if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
810 goto fouch;
811
812 /* done */
813 return cd;
814
815fouch:
816 if (e != -1)
817 _ftp_seterr(e);
818 close(cd);
819 return NULL;
820}
821
822/*
823 * Disconnect from server
824 */
825static void
826_ftp_disconnect(int cd)
827{
828 (void)_ftp_cmd(cd, "QUIT");
829 close(cd);
830}
831
832/*
833 * Check if we're already connected
834 */
835static int
836_ftp_isconnected(struct url *url)
837{
838 return (cached_socket
839 && (strcmp(url->host, cached_host.host) == 0)
840 && (strcmp(url->user, cached_host.user) == 0)
841 && (strcmp(url->pwd, cached_host.pwd) == 0)
842 && (url->port == cached_host.port));
843}
844
845/*
846 * Check the cache, reconnect if no luck
847 */
848static int
849_ftp_cached_connect(struct url *url, struct url *purl, const char *flags)
850{
851 int e, cd;
852
853 cd = -1;
854
855 /* set default port */
856 if (!url->port)
857 url->port = _fetch_default_port(url->scheme);
858
859 /* try to use previously cached connection */
860 if (_ftp_isconnected(url)) {
861 e = _ftp_cmd(cached_socket, "NOOP");
862 if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
863 return cached_socket;
864 }
865
866 /* connect to server */
867 if ((cd = _ftp_connect(url, purl, flags)) == -1)
868 return -1;
869 if (cached_socket)
870 _ftp_disconnect(cached_socket);
871 cached_socket = cd;
872 memcpy(&cached_host, url, sizeof *url);
873 return cd;
874}
875
876/*
877 * Check the proxy settings
878 */
879static struct url *
880_ftp_get_proxy(void)
881{
882 struct url *purl;
883 char *p;
884
885 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) ||
886 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
887 *p && (purl = fetchParseURL(p)) != NULL) {
888 if (!*purl->scheme) {
889 if (getenv("FTP_PROXY") || getenv("ftp_proxy"))
890 strcpy(purl->scheme, SCHEME_FTP);
891 else
892 strcpy(purl->scheme, SCHEME_HTTP);
893 }
894 if (!purl->port)
895 purl->port = _fetch_default_proxy_port(purl->scheme);
896 if (strcasecmp(purl->scheme, SCHEME_FTP) == 0 ||
897 strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
898 return purl;
899 fetchFreeURL(purl);
900 }
901 return NULL;
902}
903
904/*
905 * Get and stat file
906 */
907FILE *
908fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags)
909{
910 struct url *purl;
911 int cd;
912
913 /* get the proxy URL, and check if we should use HTTP instead */
914 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
915 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
916 return _http_request(url, "GET", us, purl, flags);
917 } else {
918 purl = NULL;
919 }
920
921 /* connect to server */
922 cd = _ftp_cached_connect(url, purl, flags);
923 if (purl)
924 fetchFreeURL(purl);
925 if (cd == NULL)
926 return NULL;
927
928 /* change directory */
929 if (_ftp_cwd(cd, url->doc) == -1)
930 return NULL;
931
932 /* stat file */
933 if (us && _ftp_stat(cd, url->doc, us) == -1
934 && fetchLastErrCode != FETCH_PROTO
935 && fetchLastErrCode != FETCH_UNAVAIL)
936 return NULL;
937
938 /* initiate the transfer */
939 return _ftp_transfer(cd, "RETR", url->doc, O_RDONLY, url->offset, flags);
940}
941
942/*
943 * Get file
944 */
945FILE *
946fetchGetFTP(struct url *url, const char *flags)
947{
948 return fetchXGetFTP(url, NULL, flags);
949}
950
951/*
952 * Put file
953 */
954FILE *
955fetchPutFTP(struct url *url, const char *flags)
956{
957 struct url *purl;
958 int cd;
959
960 /* get the proxy URL, and check if we should use HTTP instead */
961 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
962 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0)
963 /* XXX HTTP PUT is not implemented, so try without the proxy */
964 purl = NULL;
965 } else {
966 purl = NULL;
967 }
968
969 /* connect to server */
970 cd = _ftp_cached_connect(url, purl, flags);
971 if (purl)
972 fetchFreeURL(purl);
973 if (cd == NULL)
974 return NULL;
975
976 /* change directory */
977 if (_ftp_cwd(cd, url->doc) == -1)
978 return NULL;
979
980 /* initiate the transfer */
981 return _ftp_transfer(cd, CHECK_FLAG('a') ? "APPE" : "STOR",
982 url->doc, O_WRONLY, url->offset, flags);
983}
984
985/*
986 * Get file stats
987 */
988int
989fetchStatFTP(struct url *url, struct url_stat *us, const char *flags)
990{
991 struct url *purl;
992 int cd;
993
994 /* get the proxy URL, and check if we should use HTTP instead */
995 if (!CHECK_FLAG('d') && (purl = _ftp_get_proxy()) != NULL) {
996 if (strcasecmp(purl->scheme, SCHEME_HTTP) == 0) {
997 FILE *f;
998
999 if ((f = _http_request(url, "HEAD", us, purl, flags)) == NULL)
1000 return -1;
1001 fclose(f);
1002 return 0;
1003 }
1004 } else {
1005 purl = NULL;
1006 }
1007
1008 /* connect to server */
1009 cd = _ftp_cached_connect(url, purl, flags);
1010 if (purl)
1011 fetchFreeURL(purl);
1012 if (cd == NULL)
1013 return NULL;
1014
1015 /* change directory */
1016 if (_ftp_cwd(cd, url->doc) == -1)
1017 return -1;
1018
1019 /* stat file */
1020 return _ftp_stat(cd, url->doc, us);
1021}
1022
1023/*
1024 * List a directory
1025 */
1026struct url_ent *
1027fetchListFTP(struct url *url, const char *flags)
1028{
1029 warnx("fetchListFTP(): not implemented");
1030 return NULL;
1031}