1 /*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND Beerware)
3 *
4 * Copyright (c) 1998-2011 Dag-Erling Smørgrav
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer
12 * in this position and unchanged.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include <sys/cdefs.h>
32 /*
33 * Portions of this code were taken from or based on ftpio.c:
34 *
35 * ----------------------------------------------------------------------------
36 * "THE BEER-WARE LICENSE" (Revision 42):
37 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
38 * can do whatever you want with this stuff. If we meet some day, and you think
39 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
40 * ----------------------------------------------------------------------------
41 *
42 * Major Changelog:
43 *
44 * Dag-Erling Smørgrav
45 * 9 Jun 1998
46 *
47 * Incorporated into libfetch
48 *
49 * Jordan K. Hubbard
50 * 17 Jan 1996
51 *
52 * Turned inside out. Now returns xfers as new file ids, not as a special
53 * `state' of FTP_t
54 *
55 * $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $
56 *
57 */
58
59 #include <sys/param.h>
60 #include <sys/socket.h>
61 #include <netinet/in.h>
62
63 #include <ctype.h>
64 #include <err.h>
65 #include <errno.h>
66 #include <fcntl.h>
67 #include <netdb.h>
68 #include <stdarg.h>
69 #include <stdint.h>
70 #include <stdio.h>
71 #include <stdlib.h>
72 #include <string.h>
73 #include <time.h>
74 #include <unistd.h>
75
76 #include "fetch.h"
77 #include "common.h"
78 #include "ftperr.h"
79
80 #define FTP_ANONYMOUS_USER "anonymous"
81
82 #define FTP_CONNECTION_ALREADY_OPEN 125
83 #define FTP_OPEN_DATA_CONNECTION 150
84 #define FTP_OK 200
85 #define FTP_FILE_STATUS 213
86 #define FTP_SERVICE_READY 220
87 #define FTP_TRANSFER_COMPLETE 226
88 #define FTP_PASSIVE_MODE 227
89 #define FTP_LPASSIVE_MODE 228
90 #define FTP_EPASSIVE_MODE 229
91 #define FTP_LOGGED_IN 230
92 #define FTP_FILE_ACTION_OK 250
93 #define FTP_DIRECTORY_CREATED 257 /* multiple meanings */
94 #define FTP_FILE_CREATED 257 /* multiple meanings */
95 #define FTP_WORKING_DIRECTORY 257 /* multiple meanings */
96 #define FTP_NEED_PASSWORD 331
97 #define FTP_NEED_ACCOUNT 332
98 #define FTP_FILE_OK 350
99 #define FTP_SYNTAX_ERROR 500
100 #define FTP_PROTOCOL_ERROR 999
101
102 static struct url cached_host;
103 static conn_t *cached_connection;
104
105 #define isftpreply(foo) \
106 (isdigit((unsigned char)foo[0]) && \
107 isdigit((unsigned char)foo[1]) && \
108 isdigit((unsigned char)foo[2]) && \
109 (foo[3] == ' ' || foo[3] == '\0'))
110 #define isftpinfo(foo) \
111 (isdigit((unsigned char)foo[0]) && \
112 isdigit((unsigned char)foo[1]) && \
113 isdigit((unsigned char)foo[2]) && \
114 foo[3] == '-')
115
116 /*
117 * Translate IPv4 mapped IPv6 address to IPv4 address
118 */
119 static void
unmappedaddr(struct sockaddr_in6 * sin6)120 unmappedaddr(struct sockaddr_in6 *sin6)
121 {
122 struct sockaddr_in *sin4;
123 u_int32_t addr;
124 int port;
125
126 if (sin6->sin6_family != AF_INET6 ||
127 !IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
128 return;
129 sin4 = (struct sockaddr_in *)sin6;
130 addr = *(u_int32_t *)(uintptr_t)&sin6->sin6_addr.s6_addr[12];
131 port = sin6->sin6_port;
132 memset(sin4, 0, sizeof(struct sockaddr_in));
133 sin4->sin_addr.s_addr = addr;
134 sin4->sin_port = port;
135 sin4->sin_family = AF_INET;
136 sin4->sin_len = sizeof(struct sockaddr_in);
137 }
138
139 /*
140 * Get server response
141 */
142 static int
ftp_chkerr(conn_t * conn)143 ftp_chkerr(conn_t *conn)
144 {
145 ssize_t rlen;
146
147 if ((rlen = fetch_getln(conn)) < 0) {
148 fetch_syserr();
149 return (-1);
150 }
151
152 if (isftpinfo(conn->line)) {
153 while (rlen && !isftpreply(conn->line)) {
154 if ((rlen = fetch_getln(conn)) < 0) {
155 fetch_syserr();
156 return (-1);
157 }
158 }
159 }
160
161 if (!isftpreply(conn->line)) {
162 ftp_seterr(FTP_PROTOCOL_ERROR);
163 return (-1);
164 }
165
166 conn->err = (conn->line[0] - '0') * 100
167 + (conn->line[1] - '0') * 10
168 + (conn->line[2] - '0');
169
170 return (conn->err);
171 }
172
173 /*
174 * Send a command and check reply
175 */
176 static int
ftp_cmd(conn_t * conn,const char * fmt,...)177 ftp_cmd(conn_t *conn, const char *fmt, ...)
178 {
179 va_list ap;
180 size_t len;
181 char *msg;
182 int r;
183
184 va_start(ap, fmt);
185 len = vasprintf(&msg, fmt, ap);
186 va_end(ap);
187
188 if (msg == NULL) {
189 errno = ENOMEM;
190 fetch_syserr();
191 return (-1);
192 }
193
194 r = fetch_putln(conn, msg, len);
195 free(msg);
196
197 if (r == -1) {
198 fetch_syserr();
199 return (-1);
200 }
201
202 return (ftp_chkerr(conn));
203 }
204
205 /*
206 * Return a pointer to the filename part of a path
207 */
208 static const char *
ftp_filename(const char * file,int * len,int * type)209 ftp_filename(const char *file, int *len, int *type)
210 {
211 const char *s;
212
213 if ((s = strrchr(file, '/')) == NULL)
214 s = file;
215 else
216 s = s + 1;
217 *len = strlen(s);
218 if (*len > 7 && strncmp(s + *len - 7, ";type=", 6) == 0) {
219 *type = s[*len - 1];
220 *len -= 7;
221 } else {
222 *type = '\0';
223 }
224 return (s);
225 }
226
227 /*
228 * Get current working directory from the reply to a CWD, PWD or CDUP
229 * command.
230 */
231 static int
ftp_pwd(conn_t * conn,char * pwd,size_t pwdlen)232 ftp_pwd(conn_t *conn, char *pwd, size_t pwdlen)
233 {
234 char *src, *dst, *end;
235 int q;
236
237 if (conn->err != FTP_WORKING_DIRECTORY &&
238 conn->err != FTP_FILE_ACTION_OK)
239 return (FTP_PROTOCOL_ERROR);
240 end = conn->line + conn->linelen;
241 src = conn->line + 4;
242 if (src >= end || *src++ != '"')
243 return (FTP_PROTOCOL_ERROR);
244 for (q = 0, dst = pwd; src < end && pwdlen--; ++src) {
245 if (!q && *src == '"')
246 q = 1;
247 else if (q && *src != '"')
248 break;
249 else if (q)
250 *dst++ = '"', q = 0;
251 else
252 *dst++ = *src;
253 }
254 if (!pwdlen)
255 return (FTP_PROTOCOL_ERROR);
256 *dst = '\0';
257 #if 0
258 DEBUGF("pwd: [%s]\n", pwd);
259 #endif
260 return (FTP_OK);
261 }
262
263 /*
264 * Change working directory to the directory that contains the specified
265 * file.
266 */
267 static int
ftp_cwd(conn_t * conn,const char * file)268 ftp_cwd(conn_t *conn, const char *file)
269 {
270 const char *beg, *end;
271 char pwd[PATH_MAX];
272 int e, i, len;
273
274 /* If no slashes in name, no need to change dirs. */
275 if ((end = strrchr(file, '/')) == NULL)
276 return (0);
277 if ((e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY ||
278 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) {
279 ftp_seterr(e);
280 return (-1);
281 }
282 for (;;) {
283 len = strlen(pwd);
284
285 /* Look for a common prefix between PWD and dir to fetch. */
286 for (i = 0; i <= len && i <= end - file; ++i)
287 if (pwd[i] != file[i])
288 break;
289 #if 0
290 DEBUGF("have: [%.*s|%s]\n", i, pwd, pwd + i);
291 DEBUGF("want: [%.*s|%s]\n", i, file, file + i);
292 #endif
293 /* Keep going up a dir until we have a matching prefix. */
294 if (pwd[i] == '\0' && (file[i - 1] == '/' || file[i] == '/'))
295 break;
296 if ((e = ftp_cmd(conn, "CDUP")) != FTP_FILE_ACTION_OK ||
297 (e = ftp_cmd(conn, "PWD")) != FTP_WORKING_DIRECTORY ||
298 (e = ftp_pwd(conn, pwd, sizeof(pwd))) != FTP_OK) {
299 ftp_seterr(e);
300 return (-1);
301 }
302 }
303
304 #ifdef FTP_COMBINE_CWDS
305 /* Skip leading slashes, even "////". */
306 for (beg = file + i; beg < end && *beg == '/'; ++beg, ++i)
307 /* nothing */ ;
308
309 /* If there is no trailing dir, we're already there. */
310 if (beg >= end)
311 return (0);
312
313 /* Change to the directory all in one chunk (e.g., foo/bar/baz). */
314 e = ftp_cmd(conn, "CWD %.*s", (int)(end - beg), beg);
315 if (e == FTP_FILE_ACTION_OK)
316 return (0);
317 #endif /* FTP_COMBINE_CWDS */
318
319 /* That didn't work so go back to legacy behavior (multiple CWDs). */
320 for (beg = file + i; beg < end; beg = file + i + 1) {
321 while (*beg == '/')
322 ++beg, ++i;
323 for (++i; file + i < end && file[i] != '/'; ++i)
324 /* nothing */ ;
325 e = ftp_cmd(conn, "CWD %.*s", file + i - beg, beg);
326 if (e != FTP_FILE_ACTION_OK) {
327 ftp_seterr(e);
328 return (-1);
329 }
330 }
331 return (0);
332 }
333
334 /*
335 * Set transfer mode and data type
336 */
337 static int
ftp_mode_type(conn_t * conn,int mode,int type)338 ftp_mode_type(conn_t *conn, int mode, int type)
339 {
340 int e;
341
342 switch (mode) {
343 case 0:
344 case 's':
345 mode = 'S';
346 case 'S':
347 break;
348 default:
349 return (FTP_PROTOCOL_ERROR);
350 }
351 if ((e = ftp_cmd(conn, "MODE %c", mode)) != FTP_OK) {
352 if (mode == 'S') {
353 /*
354 * Stream mode is supposed to be the default - so
355 * much so that some servers not only do not
356 * support any other mode, but do not support the
357 * MODE command at all.
358 *
359 * If "MODE S" fails, it is unlikely that we
360 * previously succeeded in setting a different
361 * mode. Therefore, we simply hope that the
362 * server is already in the correct mode, and
363 * silently ignore the failure.
364 */
365 } else {
366 return (e);
367 }
368 }
369
370 switch (type) {
371 case 0:
372 case 'i':
373 type = 'I';
374 case 'I':
375 break;
376 case 'a':
377 type = 'A';
378 case 'A':
379 break;
380 case 'd':
381 type = 'D';
382 case 'D':
383 /* can't handle yet */
384 default:
385 return (FTP_PROTOCOL_ERROR);
386 }
387 if ((e = ftp_cmd(conn, "TYPE %c", type)) != FTP_OK)
388 return (e);
389
390 return (FTP_OK);
391 }
392
393 /*
394 * Request and parse file stats
395 */
396 static int
ftp_stat(conn_t * conn,const char * file,struct url_stat * us)397 ftp_stat(conn_t *conn, const char *file, struct url_stat *us)
398 {
399 char *ln;
400 const char *filename;
401 int filenamelen, type;
402 struct tm tm;
403 time_t t;
404 int e;
405
406 us->size = -1;
407 us->atime = us->mtime = 0;
408
409 filename = ftp_filename(file, &filenamelen, &type);
410
411 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK) {
412 ftp_seterr(e);
413 return (-1);
414 }
415
416 e = ftp_cmd(conn, "SIZE %.*s", filenamelen, filename);
417 if (e != FTP_FILE_STATUS) {
418 ftp_seterr(e);
419 return (-1);
420 }
421 for (ln = conn->line + 4; *ln && isspace((unsigned char)*ln); ln++)
422 /* nothing */ ;
423 for (us->size = 0; *ln && isdigit((unsigned char)*ln); ln++)
424 us->size = us->size * 10 + *ln - '0';
425 if (*ln && !isspace((unsigned char)*ln)) {
426 ftp_seterr(FTP_PROTOCOL_ERROR);
427 us->size = -1;
428 return (-1);
429 }
430 if (us->size == 0)
431 us->size = -1;
432 DEBUGF("size: [%lld]\n", (long long)us->size);
433
434 e = ftp_cmd(conn, "MDTM %.*s", filenamelen, filename);
435 if (e != FTP_FILE_STATUS) {
436 ftp_seterr(e);
437 return (-1);
438 }
439 for (ln = conn->line + 4; *ln && isspace((unsigned char)*ln); ln++)
440 /* nothing */ ;
441 switch (strspn(ln, "0123456789")) {
442 case 14:
443 break;
444 case 15:
445 ln++;
446 ln[0] = '2';
447 ln[1] = '0';
448 break;
449 default:
450 ftp_seterr(FTP_PROTOCOL_ERROR);
451 return (-1);
452 }
453 if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
454 &tm.tm_year, &tm.tm_mon, &tm.tm_mday,
455 &tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
456 ftp_seterr(FTP_PROTOCOL_ERROR);
457 return (-1);
458 }
459 tm.tm_mon--;
460 tm.tm_year -= 1900;
461 tm.tm_isdst = -1;
462 t = timegm(&tm);
463 if (t == (time_t)-1)
464 t = time(NULL);
465 us->mtime = t;
466 us->atime = t;
467 DEBUGF("last modified: [%04d-%02d-%02d %02d:%02d:%02d]\n",
468 tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
469 tm.tm_hour, tm.tm_min, tm.tm_sec);
470 return (0);
471 }
472
473 /*
474 * I/O functions for FTP
475 */
476 struct ftpio {
477 conn_t *cconn; /* Control connection */
478 conn_t *dconn; /* Data connection */
479 int dir; /* Direction */
480 int eof; /* EOF reached */
481 int err; /* Error code */
482 };
483
484 static int ftp_readfn(void *, char *, int);
485 static int ftp_writefn(void *, const char *, int);
486 static fpos_t ftp_seekfn(void *, fpos_t, int);
487 static int ftp_closefn(void *);
488
489 static int
ftp_readfn(void * v,char * buf,int len)490 ftp_readfn(void *v, char *buf, int len)
491 {
492 struct ftpio *io;
493 int r;
494
495 io = (struct ftpio *)v;
496 if (io == NULL) {
497 errno = EBADF;
498 return (-1);
499 }
500 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_WRONLY) {
501 errno = EBADF;
502 return (-1);
503 }
504 if (io->err) {
505 errno = io->err;
506 return (-1);
507 }
508 if (io->eof)
509 return (0);
510 r = fetch_read(io->dconn, buf, len);
511 if (r > 0)
512 return (r);
513 if (r == 0) {
514 io->eof = 1;
515 return (0);
516 }
517 if (errno != EINTR)
518 io->err = errno;
519 return (-1);
520 }
521
522 static int
ftp_writefn(void * v,const char * buf,int len)523 ftp_writefn(void *v, const char *buf, int len)
524 {
525 struct ftpio *io;
526 int w;
527
528 io = (struct ftpio *)v;
529 if (io == NULL) {
530 errno = EBADF;
531 return (-1);
532 }
533 if (io->cconn == NULL || io->dconn == NULL || io->dir == O_RDONLY) {
534 errno = EBADF;
535 return (-1);
536 }
537 if (io->err) {
538 errno = io->err;
539 return (-1);
540 }
541 w = fetch_write(io->dconn, buf, len);
542 if (w >= 0)
543 return (w);
544 if (errno != EINTR)
545 io->err = errno;
546 return (-1);
547 }
548
549 static fpos_t
ftp_seekfn(void * v,fpos_t pos __unused,int whence __unused)550 ftp_seekfn(void *v, fpos_t pos __unused, int whence __unused)
551 {
552 struct ftpio *io;
553
554 io = (struct ftpio *)v;
555 if (io == NULL) {
556 errno = EBADF;
557 return (-1);
558 }
559 errno = ESPIPE;
560 return (-1);
561 }
562
563 static int
ftp_closefn(void * v)564 ftp_closefn(void *v)
565 {
566 struct ftpio *io;
567 int r;
568
569 io = (struct ftpio *)v;
570 if (io == NULL) {
571 errno = EBADF;
572 return (-1);
573 }
574 if (io->dir == -1)
575 return (0);
576 if (io->cconn == NULL || io->dconn == NULL) {
577 errno = EBADF;
578 return (-1);
579 }
580 fetch_close(io->dconn);
581 io->dir = -1;
582 io->dconn = NULL;
583 DEBUGF("Waiting for final status\n");
584 r = ftp_chkerr(io->cconn);
585 if (io->cconn == cached_connection && io->cconn->ref == 1)
586 cached_connection = NULL;
587 fetch_close(io->cconn);
588 free(io);
589 return (r == FTP_TRANSFER_COMPLETE) ? 0 : -1;
590 }
591
592 static FILE *
ftp_setup(conn_t * cconn,conn_t * dconn,int mode)593 ftp_setup(conn_t *cconn, conn_t *dconn, int mode)
594 {
595 struct ftpio *io;
596 FILE *f;
597
598 if (cconn == NULL || dconn == NULL)
599 return (NULL);
600 if ((io = malloc(sizeof(*io))) == NULL)
601 return (NULL);
602 io->cconn = cconn;
603 io->dconn = dconn;
604 io->dir = mode;
605 io->eof = io->err = 0;
606 f = funopen(io, ftp_readfn, ftp_writefn, ftp_seekfn, ftp_closefn);
607 if (f == NULL)
608 free(io);
609 return (f);
610 }
611
612 /*
613 * Transfer file
614 */
615 static FILE *
ftp_transfer(conn_t * conn,const char * oper,const char * file,int mode,off_t offset,const char * flags)616 ftp_transfer(conn_t *conn, const char *oper, const char *file,
617 int mode, off_t offset, const char *flags)
618 {
619 struct sockaddr_storage sa;
620 struct sockaddr_in6 *sin6;
621 struct sockaddr_in *sin4;
622 const char *bindaddr;
623 const char *filename;
624 int filenamelen, type;
625 int low, pasv, verbose;
626 int e, sd = -1;
627 socklen_t l;
628 char *s;
629 FILE *df;
630
631 /* check flags */
632 low = CHECK_FLAG('l');
633 pasv = CHECK_FLAG('p') || !CHECK_FLAG('P');
634 verbose = CHECK_FLAG('v');
635
636 /* passive mode */
637 if ((s = getenv("FTP_PASSIVE_MODE")) != NULL)
638 pasv = (strncasecmp(s, "no", 2) != 0);
639
640 /* isolate filename */
641 filename = ftp_filename(file, &filenamelen, &type);
642
643 /* set transfer mode and data type */
644 if ((e = ftp_mode_type(conn, 0, type)) != FTP_OK)
645 goto ouch;
646
647 /* find our own address, bind, and listen */
648 l = sizeof(sa);
649 if (getsockname(conn->sd, (struct sockaddr *)&sa, &l) == -1)
650 goto sysouch;
651 if (sa.ss_family == AF_INET6)
652 unmappedaddr((struct sockaddr_in6 *)&sa);
653
654 /* open data socket */
655 if ((sd = socket(sa.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
656 fetch_syserr();
657 return (NULL);
658 }
659
660 if (pasv) {
661 u_char addr[64];
662 char *ln, *p;
663 unsigned int i;
664 int port;
665
666 /* send PASV command */
667 if (verbose)
668 fetch_info("setting passive mode");
669 switch (sa.ss_family) {
670 case AF_INET:
671 if ((e = ftp_cmd(conn, "PASV")) != FTP_PASSIVE_MODE)
672 goto ouch;
673 break;
674 case AF_INET6:
675 if ((e = ftp_cmd(conn, "EPSV")) != FTP_EPASSIVE_MODE) {
676 if (e == -1)
677 goto ouch;
678 if ((e = ftp_cmd(conn, "LPSV")) !=
679 FTP_LPASSIVE_MODE)
680 goto ouch;
681 }
682 break;
683 default:
684 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
685 goto ouch;
686 }
687
688 /*
689 * Find address and port number. The reply to the PASV command
690 * is IMHO the one and only weak point in the FTP protocol.
691 */
692 ln = conn->line;
693 switch (e) {
694 case FTP_PASSIVE_MODE:
695 case FTP_LPASSIVE_MODE:
696 for (p = ln + 3; *p && !isdigit((unsigned char)*p); p++)
697 /* nothing */ ;
698 if (!*p) {
699 e = FTP_PROTOCOL_ERROR;
700 goto ouch;
701 }
702 l = (e == FTP_PASSIVE_MODE ? 6 : 21);
703 for (i = 0; *p && i < l; i++, p++) {
704 addr[i] = strtol(p, &p, 10);
705 if (*p == '\0' && i < l - 1)
706 break;
707 }
708 if (i < l) {
709 e = FTP_PROTOCOL_ERROR;
710 goto ouch;
711 }
712 break;
713 case FTP_EPASSIVE_MODE:
714 for (p = ln + 3; *p && *p != '('; p++)
715 /* nothing */ ;
716 if (!*p) {
717 e = FTP_PROTOCOL_ERROR;
718 goto ouch;
719 }
720 ++p;
721 if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
722 &port, &addr[3]) != 5 ||
723 addr[0] != addr[1] ||
724 addr[0] != addr[2] || addr[0] != addr[3]) {
725 e = FTP_PROTOCOL_ERROR;
726 goto ouch;
727 }
728 break;
729 }
730
731 /* seek to required offset */
732 if (offset)
733 if (ftp_cmd(conn, "REST %lu", (u_long)offset) != FTP_FILE_OK)
734 goto sysouch;
735
736 /* construct sockaddr for data socket */
737 l = sizeof(sa);
738 if (getpeername(conn->sd, (struct sockaddr *)&sa, &l) == -1)
739 goto sysouch;
740 if (sa.ss_family == AF_INET6)
741 unmappedaddr((struct sockaddr_in6 *)&sa);
742 switch (sa.ss_family) {
743 case AF_INET6:
744 sin6 = (struct sockaddr_in6 *)&sa;
745 if (e == FTP_EPASSIVE_MODE)
746 sin6->sin6_port = htons(port);
747 else {
748 memcpy(&sin6->sin6_addr, addr + 2, 16);
749 memcpy(&sin6->sin6_port, addr + 19, 2);
750 }
751 break;
752 case AF_INET:
753 sin4 = (struct sockaddr_in *)&sa;
754 if (e == FTP_EPASSIVE_MODE)
755 sin4->sin_port = htons(port);
756 else {
757 memcpy(&sin4->sin_addr, addr, 4);
758 memcpy(&sin4->sin_port, addr + 4, 2);
759 }
760 break;
761 default:
762 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
763 break;
764 }
765
766 /* connect to data port */
767 if (verbose)
768 fetch_info("opening data connection");
769 bindaddr = getenv("FETCH_BIND_ADDRESS");
770 if (bindaddr != NULL && *bindaddr != '\0' &&
771 (e = fetch_bind(sd, sa.ss_family, bindaddr)) != 0)
772 goto ouch;
773 if (connect(sd, (struct sockaddr *)&sa, sa.ss_len) == -1)
774 goto sysouch;
775
776 /* make the server initiate the transfer */
777 if (verbose)
778 fetch_info("initiating transfer");
779 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename);
780 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
781 goto ouch;
782
783 } else {
784 u_int32_t a;
785 u_short p;
786 int arg, d;
787 char *ap;
788 char hname[INET6_ADDRSTRLEN];
789
790 switch (sa.ss_family) {
791 case AF_INET6:
792 ((struct sockaddr_in6 *)&sa)->sin6_port = 0;
793 #ifdef IPV6_PORTRANGE
794 arg = low ? IPV6_PORTRANGE_DEFAULT : IPV6_PORTRANGE_HIGH;
795 if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
796 (char *)&arg, sizeof(arg)) == -1)
797 goto sysouch;
798 #endif
799 break;
800 case AF_INET:
801 ((struct sockaddr_in *)&sa)->sin_port = 0;
802 arg = low ? IP_PORTRANGE_DEFAULT : IP_PORTRANGE_HIGH;
803 if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
804 (char *)&arg, sizeof(arg)) == -1)
805 goto sysouch;
806 break;
807 }
808 if (verbose)
809 fetch_info("binding data socket");
810 if (bind(sd, (struct sockaddr *)&sa, sa.ss_len) == -1)
811 goto sysouch;
812 if (listen(sd, 1) == -1)
813 goto sysouch;
814
815 /* find what port we're on and tell the server */
816 if (getsockname(sd, (struct sockaddr *)&sa, &l) == -1)
817 goto sysouch;
818 switch (sa.ss_family) {
819 case AF_INET:
820 sin4 = (struct sockaddr_in *)&sa;
821 a = ntohl(sin4->sin_addr.s_addr);
822 p = ntohs(sin4->sin_port);
823 e = ftp_cmd(conn, "PORT %d,%d,%d,%d,%d,%d",
824 (a >> 24) & 0xff, (a >> 16) & 0xff,
825 (a >> 8) & 0xff, a & 0xff,
826 (p >> 8) & 0xff, p & 0xff);
827 break;
828 case AF_INET6:
829 #define UC(b) (((int)b)&0xff)
830 e = -1;
831 sin6 = (struct sockaddr_in6 *)&sa;
832 sin6->sin6_scope_id = 0;
833 if (getnameinfo((struct sockaddr *)&sa, sa.ss_len,
834 hname, sizeof(hname),
835 NULL, 0, NI_NUMERICHOST) == 0) {
836 e = ftp_cmd(conn, "EPRT |%d|%s|%d|", 2, hname,
837 htons(sin6->sin6_port));
838 if (e == -1)
839 goto ouch;
840 }
841 if (e != FTP_OK) {
842 ap = (char *)&sin6->sin6_addr;
843 e = ftp_cmd(conn,
844 "LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
845 6, 16,
846 UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
847 UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
848 UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
849 UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
850 2,
851 (ntohs(sin6->sin6_port) >> 8) & 0xff,
852 ntohs(sin6->sin6_port) & 0xff);
853 }
854 break;
855 default:
856 e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
857 goto ouch;
858 }
859 if (e != FTP_OK)
860 goto ouch;
861
862 /* seek to required offset */
863 if (offset)
864 if (ftp_cmd(conn, "REST %ju", (uintmax_t)offset) != FTP_FILE_OK)
865 goto sysouch;
866
867 /* make the server initiate the transfer */
868 if (verbose)
869 fetch_info("initiating transfer");
870 e = ftp_cmd(conn, "%s %.*s", oper, filenamelen, filename);
871 if (e != FTP_CONNECTION_ALREADY_OPEN && e != FTP_OPEN_DATA_CONNECTION)
872 goto ouch;
873
874 /* accept the incoming connection and go to town */
875 if ((d = accept(sd, NULL, NULL)) == -1)
876 goto sysouch;
877 close(sd);
878 sd = d;
879 }
880
881 if ((df = ftp_setup(conn, fetch_reopen(sd), mode)) == NULL)
882 goto sysouch;
883 return (df);
884
885 sysouch:
886 fetch_syserr();
887 if (sd >= 0)
888 close(sd);
889 return (NULL);
890
891 ouch:
892 if (e != -1)
893 ftp_seterr(e);
894 if (sd >= 0)
895 close(sd);
896 return (NULL);
897 }
898
899 /*
900 * Authenticate
901 */
902 static int
ftp_authenticate(conn_t * conn,struct url * url,struct url * purl)903 ftp_authenticate(conn_t *conn, struct url *url, struct url *purl)
904 {
905 const char *user, *pwd, *logname;
906 char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
907 int e, len;
908
909 /* XXX FTP_AUTH, and maybe .netrc */
910
911 /* send user name and password */
912 if (url->user[0] == '\0')
913 fetch_netrc_auth(url);
914 user = url->user;
915 if (*user == '\0')
916 if ((user = getenv("FTP_LOGIN")) != NULL)
917 DEBUGF("FTP_LOGIN=%s\n", user);
918 if (user == NULL || *user == '\0')
919 user = FTP_ANONYMOUS_USER;
920 if (purl && url->port == fetch_default_port(url->scheme))
921 e = ftp_cmd(conn, "USER %s@%s", user, url->host);
922 else if (purl)
923 e = ftp_cmd(conn, "USER %s@%s@%d", user, url->host, url->port);
924 else
925 e = ftp_cmd(conn, "USER %s", user);
926
927 /* did the server request a password? */
928 if (e == FTP_NEED_PASSWORD) {
929 pwd = url->pwd;
930 if (*pwd == '\0')
931 if ((pwd = getenv("FTP_PASSWORD")) != NULL)
932 DEBUGF("FTP_PASSWORD=%s\n", pwd);
933 if (pwd == NULL || *pwd == '\0') {
934 if ((logname = getlogin()) == NULL)
935 logname = FTP_ANONYMOUS_USER;
936 if ((len = snprintf(pbuf, MAXLOGNAME + 1, "%s@", logname)) < 0)
937 len = 0;
938 else if (len > MAXLOGNAME)
939 len = MAXLOGNAME;
940 gethostname(pbuf + len, sizeof(pbuf) - len);
941 pwd = pbuf;
942 }
943 e = ftp_cmd(conn, "PASS %s", pwd);
944 }
945
946 return (e);
947 }
948
949 /*
950 * Log on to FTP server
951 */
952 static conn_t *
ftp_connect(struct url * url,struct url * purl,const char * flags)953 ftp_connect(struct url *url, struct url *purl, const char *flags)
954 {
955 conn_t *conn;
956 int e, direct, verbose;
957 #ifdef INET6
958 int af = AF_UNSPEC;
959 #else
960 int af = AF_INET;
961 #endif
962
963 direct = CHECK_FLAG('d');
964 verbose = CHECK_FLAG('v');
965 if (CHECK_FLAG('4'))
966 af = AF_INET;
967 else if (CHECK_FLAG('6'))
968 af = AF_INET6;
969
970 if (direct)
971 purl = NULL;
972
973 /* check for proxy */
974 if (purl) {
975 /* XXX proxy authentication! */
976 conn = fetch_connect(purl->host, purl->port, af, verbose);
977 } else {
978 /* no proxy, go straight to target */
979 conn = fetch_connect(url->host, url->port, af, verbose);
980 purl = NULL;
981 }
982
983 /* check connection */
984 if (conn == NULL)
985 /* fetch_connect() has already set an error code */
986 return (NULL);
987
988 /* expect welcome message */
989 if ((e = ftp_chkerr(conn)) != FTP_SERVICE_READY)
990 goto fouch;
991
992 /* authenticate */
993 if ((e = ftp_authenticate(conn, url, purl)) != FTP_LOGGED_IN)
994 goto fouch;
995
996 /* TODO: Request extended features supported, if any (RFC 3659). */
997
998 /* done */
999 return (conn);
1000
1001 fouch:
1002 if (e != -1)
1003 ftp_seterr(e);
1004 fetch_close(conn);
1005 return (NULL);
1006 }
1007
1008 /*
1009 * Disconnect from server
1010 */
1011 static void
ftp_disconnect(conn_t * conn)1012 ftp_disconnect(conn_t *conn)
1013 {
1014 (void)ftp_cmd(conn, "QUIT");
1015 if (conn == cached_connection && conn->ref == 1)
1016 cached_connection = NULL;
1017 fetch_close(conn);
1018 }
1019
1020 /*
1021 * Check if we're already connected
1022 */
1023 static int
ftp_isconnected(struct url * url)1024 ftp_isconnected(struct url *url)
1025 {
1026 return (cached_connection
1027 && (strcmp(url->host, cached_host.host) == 0)
1028 && (strcmp(url->user, cached_host.user) == 0)
1029 && (strcmp(url->pwd, cached_host.pwd) == 0)
1030 && (url->port == cached_host.port));
1031 }
1032
1033 /*
1034 * Check the cache, reconnect if no luck
1035 */
1036 static conn_t *
ftp_cached_connect(struct url * url,struct url * purl,const char * flags)1037 ftp_cached_connect(struct url *url, struct url *purl, const char *flags)
1038 {
1039 conn_t *conn;
1040 int e;
1041
1042 /* set default port */
1043 if (!url->port)
1044 url->port = fetch_default_port(url->scheme);
1045
1046 /* try to use previously cached connection */
1047 if (ftp_isconnected(url)) {
1048 e = ftp_cmd(cached_connection, "NOOP");
1049 if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
1050 return (fetch_ref(cached_connection));
1051 }
1052
1053 /* connect to server */
1054 if ((conn = ftp_connect(url, purl, flags)) == NULL)
1055 return (NULL);
1056 if (cached_connection)
1057 ftp_disconnect(cached_connection);
1058 cached_connection = fetch_ref(conn);
1059 memcpy(&cached_host, url, sizeof(*url));
1060 return (conn);
1061 }
1062
1063 /*
1064 * Check the proxy settings
1065 */
1066 static struct url *
ftp_get_proxy(struct url * url,const char * flags)1067 ftp_get_proxy(struct url * url, const char *flags)
1068 {
1069 struct url *purl;
1070 char *p;
1071
1072 if (flags != NULL && strchr(flags, 'd') != NULL)
1073 return (NULL);
1074 if (fetch_no_proxy_match(url->host))
1075 return (NULL);
1076 if (((p = getenv("FTP_PROXY")) || (p = getenv("ftp_proxy")) ||
1077 (p = getenv("HTTP_PROXY")) || (p = getenv("http_proxy"))) &&
1078 *p && (purl = fetchParseURL(p)) != NULL) {
1079 if (!*purl->scheme) {
1080 if (getenv("FTP_PROXY") || getenv("ftp_proxy"))
1081 strcpy(purl->scheme, SCHEME_FTP);
1082 else
1083 strcpy(purl->scheme, SCHEME_HTTP);
1084 }
1085 if (!purl->port)
1086 purl->port = fetch_default_proxy_port(purl->scheme);
1087 if (strcmp(purl->scheme, SCHEME_FTP) == 0 ||
1088 strcmp(purl->scheme, SCHEME_HTTP) == 0)
1089 return (purl);
1090 fetchFreeURL(purl);
1091 }
1092 return (NULL);
1093 }
1094
1095 /*
1096 * Process an FTP request
1097 */
1098 FILE *
ftp_request(struct url * url,const char * op,struct url_stat * us,struct url * purl,const char * flags)1099 ftp_request(struct url *url, const char *op, struct url_stat *us,
1100 struct url *purl, const char *flags)
1101 {
1102 conn_t *conn;
1103 int oflag;
1104
1105 /* check if we should use HTTP instead */
1106 if (purl && (strcmp(purl->scheme, SCHEME_HTTP) == 0 ||
1107 strcmp(purl->scheme, SCHEME_HTTPS) == 0)) {
1108 if (strcmp(op, "STAT") == 0)
1109 return (http_request(url, "HEAD", us, purl, flags));
1110 else if (strcmp(op, "RETR") == 0)
1111 return (http_request(url, "GET", us, purl, flags));
1112 /*
1113 * Our HTTP code doesn't support PUT requests yet, so try
1114 * a direct connection.
1115 */
1116 }
1117
1118 /* connect to server */
1119 conn = ftp_cached_connect(url, purl, flags);
1120 if (purl)
1121 fetchFreeURL(purl);
1122 if (conn == NULL)
1123 return (NULL);
1124
1125 /* change directory */
1126 if (ftp_cwd(conn, url->doc) == -1)
1127 goto errsock;
1128
1129 /* stat file */
1130 if (us && ftp_stat(conn, url->doc, us) == -1
1131 && fetchLastErrCode != FETCH_PROTO
1132 && fetchLastErrCode != FETCH_UNAVAIL)
1133 goto errsock;
1134
1135 /* just a stat */
1136 if (strcmp(op, "STAT") == 0) {
1137 fetch_deref(conn);
1138 ftp_disconnect(conn);
1139 return (FILE *)1; /* bogus return value */
1140 }
1141 if (strcmp(op, "STOR") == 0 || strcmp(op, "APPE") == 0)
1142 oflag = O_WRONLY;
1143 else
1144 oflag = O_RDONLY;
1145
1146 /* initiate the transfer */
1147 return (ftp_transfer(conn, op, url->doc, oflag, url->offset, flags));
1148
1149 errsock:
1150 ftp_disconnect(conn);
1151 return (NULL);
1152 }
1153
1154 /*
1155 * Get and stat file
1156 */
1157 FILE *
fetchXGetFTP(struct url * url,struct url_stat * us,const char * flags)1158 fetchXGetFTP(struct url *url, struct url_stat *us, const char *flags)
1159 {
1160 return (ftp_request(url, "RETR", us, ftp_get_proxy(url, flags), flags));
1161 }
1162
1163 /*
1164 * Get file
1165 */
1166 FILE *
fetchGetFTP(struct url * url,const char * flags)1167 fetchGetFTP(struct url *url, const char *flags)
1168 {
1169 return (fetchXGetFTP(url, NULL, flags));
1170 }
1171
1172 /*
1173 * Put file
1174 */
1175 FILE *
fetchPutFTP(struct url * url,const char * flags)1176 fetchPutFTP(struct url *url, const char *flags)
1177 {
1178 return (ftp_request(url, CHECK_FLAG('a') ? "APPE" : "STOR", NULL,
1179 ftp_get_proxy(url, flags), flags));
1180 }
1181
1182 /*
1183 * Get file stats
1184 */
1185 int
fetchStatFTP(struct url * url,struct url_stat * us,const char * flags)1186 fetchStatFTP(struct url *url, struct url_stat *us, const char *flags)
1187 {
1188 FILE *f;
1189
1190 f = ftp_request(url, "STAT", us, ftp_get_proxy(url, flags), flags);
1191 if (f == NULL)
1192 return (-1);
1193 /*
1194 * When op is "STAT", ftp_request() will return either NULL or
1195 * (FILE *)1, never a valid FILE *, so we mustn't fclose(f) before
1196 * returning, as it would cause a segfault.
1197 */
1198 return (0);
1199 }
1200
1201 /*
1202 * List a directory
1203 */
1204 struct url_ent *
fetchListFTP(struct url * url __unused,const char * flags __unused)1205 fetchListFTP(struct url *url __unused, const char *flags __unused)
1206 {
1207 warnx("fetchListFTP(): not implemented");
1208 return (NULL);
1209 }
1210