1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
|
/*-
* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer
* in this position and unchanged.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Portions of this code were taken from or based on ftpio.c:
*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
* can do whatever you want with this stuff. If we meet some day, and you think
* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
* ----------------------------------------------------------------------------
*
* Major Changelog:
*
* Dag-Erling Coïdan Smørgrav
* 9 Jun 1998
*
* Incorporated into libfetch
*
* Jordan K. Hubbard
* 17 Jan 1996
*
* Turned inside out. Now returns xfers as new file ids, not as a special
* `state' of FTP_t
*
* $ftpioId: ftpio.c,v 1.30 1998/04/11 07:28:53 phk Exp $
*
*/
#include <sys/param.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include "fetch.h"
#include "common.h"
#include "ftperr.h"
#define FTP_ANONYMOUS_USER "ftp"
#define FTP_ANONYMOUS_PASSWORD "ftp"
#define FTP_DEFAULT_PORT 21
#define FTP_OPEN_DATA_CONNECTION 150
#define FTP_OK 200
#define FTP_FILE_STATUS 213
#define FTP_SERVICE_READY 220
#define FTP_PASSIVE_MODE 227
#define FTP_LPASSIVE_MODE 228
#define FTP_EPASSIVE_MODE 229
#define FTP_LOGGED_IN 230
#define FTP_FILE_ACTION_OK 250
#define FTP_NEED_PASSWORD 331
#define FTP_NEED_ACCOUNT 332
#define FTP_FILE_OK 350
#define FTP_SYNTAX_ERROR 500
#define FTP_PROTOCOL_ERROR 999
static struct url cached_host;
static int cached_socket;
static char *last_reply;
static size_t lr_size, lr_length;
static int last_code;
#define isftpreply(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
&& isdigit(foo[2]) \
&& (foo[3] == ' ' || foo[3] == '\0'))
#define isftpinfo(foo) (isdigit(foo[0]) && isdigit(foo[1]) \
&& isdigit(foo[2]) && foo[3] == '-')
/* translate IPv4 mapped IPv6 address to IPv4 address */
static void
unmappedaddr(struct sockaddr_in6 *sin6)
{
struct sockaddr_in *sin4;
u_int32_t addr;
int port;
if (sin6->sin6_family != AF_INET6 ||
!IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr))
return;
sin4 = (struct sockaddr_in *)sin6;
addr = *(u_int32_t *)&sin6->sin6_addr.s6_addr[12];
port = sin6->sin6_port;
memset(sin4, 0, sizeof(struct sockaddr_in));
sin4->sin_addr.s_addr = addr;
sin4->sin_port = port;
sin4->sin_family = AF_INET;
sin4->sin_len = sizeof(struct sockaddr_in);
}
/*
* Get server response
*/
static int
_ftp_chkerr(int cd)
{
if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
_fetch_syserr();
return -1;
}
if (isftpinfo(last_reply)) {
while (!isftpreply(last_reply)) {
if (_fetch_getln(cd, &last_reply, &lr_size, &lr_length) == -1) {
_fetch_syserr();
return -1;
}
}
}
while (lr_length && isspace(last_reply[lr_length-1]))
lr_length--;
last_reply[lr_length] = 0;
if (!isftpreply(last_reply)) {
_ftp_seterr(FTP_PROTOCOL_ERROR);
return -1;
}
last_code = (last_reply[0] - '0') * 100
+ (last_reply[1] - '0') * 10
+ (last_reply[2] - '0');
return last_code;
}
/*
* Send a command and check reply
*/
static int
_ftp_cmd(int cd, char *fmt, ...)
{
va_list ap;
size_t len;
char *msg;
int r;
va_start(ap, fmt);
len = vasprintf(&msg, fmt, ap);
va_end(ap);
if (msg == NULL) {
errno = ENOMEM;
_fetch_syserr();
return -1;
}
r = _fetch_putln(cd, msg, len);
free(msg);
if (r == -1) {
_fetch_syserr();
return -1;
}
return _ftp_chkerr(cd);
}
/*
* Return a pointer to the filename part of a path
*/
static char *
_ftp_filename(char *file)
{
char *s;
if ((s = strrchr(file, '/')) == NULL)
return file;
else
return s + 1;
}
/*
* Change working directory to the directory that contains the
* specified file.
*/
static int
_ftp_cwd(int cd, char *file)
{
char *s;
int e;
if ((s = strrchr(file, '/')) == NULL || s == file) {
e = _ftp_cmd(cd, "CWD /");
} else {
e = _ftp_cmd(cd, "CWD %.*s", s - file, file);
}
if (e != FTP_FILE_ACTION_OK) {
_ftp_seterr(e);
return -1;
}
return 0;
}
/*
* Request and parse file stats
*/
static int
_ftp_stat(int cd, char *file, struct url_stat *us)
{
char *ln, *s;
struct tm tm;
time_t t;
int e;
us->size = -1;
us->atime = us->mtime = 0;
if ((s = strrchr(file, '/')) == NULL)
s = file;
else
++s;
if ((e = _ftp_cmd(cd, "SIZE %s", s)) != FTP_FILE_STATUS) {
_ftp_seterr(e);
return -1;
}
for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
/* nothing */ ;
for (us->size = 0; *ln && isdigit(*ln); ln++)
us->size = us->size * 10 + *ln - '0';
if (*ln && !isspace(*ln)) {
_ftp_seterr(FTP_PROTOCOL_ERROR);
return -1;
}
DEBUG(fprintf(stderr, "size: [\033[1m%lld\033[m]\n", us->size));
if ((e = _ftp_cmd(cd, "MDTM %s", s)) != FTP_FILE_STATUS) {
_ftp_seterr(e);
return -1;
}
for (ln = last_reply + 4; *ln && isspace(*ln); ln++)
/* nothing */ ;
switch (strspn(ln, "0123456789")) {
case 14:
break;
case 15:
ln++;
ln[0] = '2';
ln[1] = '0';
break;
default:
_ftp_seterr(FTP_PROTOCOL_ERROR);
return -1;
}
if (sscanf(ln, "%04d%02d%02d%02d%02d%02d",
&tm.tm_year, &tm.tm_mon, &tm.tm_mday,
&tm.tm_hour, &tm.tm_min, &tm.tm_sec) != 6) {
_ftp_seterr(FTP_PROTOCOL_ERROR);
return -1;
}
tm.tm_mon--;
tm.tm_year -= 1900;
tm.tm_isdst = -1;
t = timegm(&tm);
if (t == (time_t)-1)
t = time(NULL);
us->mtime = t;
us->atime = t;
DEBUG(fprintf(stderr, "last modified: [\033[1m%04d-%02d-%02d "
"%02d:%02d:%02d\033[m]\n",
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
tm.tm_hour, tm.tm_min, tm.tm_sec));
return 0;
}
/*
* Transfer file
*/
static FILE *
_ftp_transfer(int cd, char *oper, char *file,
char *mode, off_t offset, char *flags)
{
struct sockaddr_storage sin;
struct sockaddr_in6 *sin6;
struct sockaddr_in *sin4;
int pasv, high, verbose;
int e, sd = -1;
socklen_t l;
char *s;
FILE *df;
/* check flags */
pasv = (flags && strchr(flags, 'p'));
high = (flags && strchr(flags, 'h'));
verbose = (flags && strchr(flags, 'v'));
/* passive mode */
if (!pasv && (s = getenv("FTP_PASSIVE_MODE")) != NULL)
pasv = (strncasecmp(s, "no", 2) != 0);
/* find our own address, bind, and listen */
l = sizeof sin;
if (getsockname(cd, (struct sockaddr *)&sin, &l) == -1)
goto sysouch;
if (sin.ss_family == AF_INET6)
unmappedaddr((struct sockaddr_in6 *)&sin);
/* open data socket */
if ((sd = socket(sin.ss_family, SOCK_STREAM, IPPROTO_TCP)) == -1) {
_fetch_syserr();
return NULL;
}
if (pasv) {
u_char addr[64];
char *ln, *p;
int i;
int port;
/* send PASV command */
if (verbose)
_fetch_info("setting passive mode");
switch (sin.ss_family) {
case AF_INET:
if ((e = _ftp_cmd(cd, "PASV")) != FTP_PASSIVE_MODE)
goto ouch;
break;
case AF_INET6:
if ((e = _ftp_cmd(cd, "EPSV")) != FTP_EPASSIVE_MODE) {
if (e == -1)
goto ouch;
if ((e = _ftp_cmd(cd, "LPSV")) != FTP_LPASSIVE_MODE)
goto ouch;
}
break;
default:
e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
goto ouch;
}
/*
* Find address and port number. The reply to the PASV command
* is IMHO the one and only weak point in the FTP protocol.
*/
ln = last_reply;
switch (e) {
case FTP_PASSIVE_MODE:
case FTP_LPASSIVE_MODE:
for (p = ln + 3; *p && !isdigit(*p); p++)
/* nothing */ ;
if (!*p) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
l = (e == FTP_PASSIVE_MODE ? 6 : 21);
for (i = 0; *p && i < l; i++, p++)
addr[i] = strtol(p, &p, 10);
if (i < l) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
break;
case FTP_EPASSIVE_MODE:
for (p = ln + 3; *p && *p != '('; p++)
/* nothing */ ;
if (!*p) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
++p;
if (sscanf(p, "%c%c%c%d%c", &addr[0], &addr[1], &addr[2],
&port, &addr[3]) != 5 ||
addr[0] != addr[1] ||
addr[0] != addr[2] || addr[0] != addr[3]) {
e = FTP_PROTOCOL_ERROR;
goto ouch;
}
break;
}
/* seek to required offset */
if (offset)
if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
goto sysouch;
/* construct sockaddr for data socket */
l = sizeof sin;
if (getpeername(cd, (struct sockaddr *)&sin, &l) == -1)
goto sysouch;
if (sin.ss_family == AF_INET6)
unmappedaddr((struct sockaddr_in6 *)&sin);
switch (sin.ss_family) {
case AF_INET6:
sin6 = (struct sockaddr_in6 *)&sin;
if (e == FTP_EPASSIVE_MODE)
sin6->sin6_port = htons(port);
else {
bcopy(addr + 2, (char *)&sin6->sin6_addr, 16);
bcopy(addr + 19, (char *)&sin6->sin6_port, 2);
}
break;
case AF_INET:
sin4 = (struct sockaddr_in *)&sin;
if (e == FTP_EPASSIVE_MODE)
sin4->sin_port = htons(port);
else {
bcopy(addr, (char *)&sin4->sin_addr, 4);
bcopy(addr + 4, (char *)&sin4->sin_port, 2);
}
break;
default:
e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
break;
}
/* connect to data port */
if (verbose)
_fetch_info("opening data connection");
if (connect(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
goto sysouch;
/* make the server initiate the transfer */
if (verbose)
_fetch_info("initiating transfer");
e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
if (e != FTP_OPEN_DATA_CONNECTION)
goto ouch;
} else {
u_int32_t a;
u_short p;
int arg, d;
char *ap;
char hname[INET6_ADDRSTRLEN];
switch (sin.ss_family) {
case AF_INET6:
((struct sockaddr_in6 *)&sin)->sin6_port = 0;
#ifdef IPV6_PORTRANGE
arg = high ? IPV6_PORTRANGE_HIGH : IPV6_PORTRANGE_DEFAULT;
if (setsockopt(sd, IPPROTO_IPV6, IPV6_PORTRANGE,
(char *)&arg, sizeof(arg)) == -1)
goto sysouch;
#endif
break;
case AF_INET:
((struct sockaddr_in *)&sin)->sin_port = 0;
arg = high ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
if (setsockopt(sd, IPPROTO_IP, IP_PORTRANGE,
(char *)&arg, sizeof arg) == -1)
goto sysouch;
break;
}
if (verbose)
_fetch_info("binding data socket");
if (bind(sd, (struct sockaddr *)&sin, sin.ss_len) == -1)
goto sysouch;
if (listen(sd, 1) == -1)
goto sysouch;
/* find what port we're on and tell the server */
if (getsockname(sd, (struct sockaddr *)&sin, &l) == -1)
goto sysouch;
switch (sin.ss_family) {
case AF_INET:
sin4 = (struct sockaddr_in *)&sin;
a = ntohl(sin4->sin_addr.s_addr);
p = ntohs(sin4->sin_port);
e = _ftp_cmd(cd, "PORT %d,%d,%d,%d,%d,%d",
(a >> 24) & 0xff, (a >> 16) & 0xff,
(a >> 8) & 0xff, a & 0xff,
(p >> 8) & 0xff, p & 0xff);
break;
case AF_INET6:
#define UC(b) (((int)b)&0xff)
e = -1;
sin6 = (struct sockaddr_in6 *)&sin;
if (getnameinfo((struct sockaddr *)&sin, sin.ss_len,
hname, sizeof(hname),
NULL, 0, NI_NUMERICHOST) == 0) {
e = _ftp_cmd(cd, "EPRT |%d|%s|%d|", 2, hname,
htons(sin6->sin6_port));
if (e == -1)
goto ouch;
}
if (e != FTP_OK) {
ap = (char *)&sin6->sin6_addr;
e = _ftp_cmd(cd,
"LPRT %d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d",
6, 16,
UC(ap[0]), UC(ap[1]), UC(ap[2]), UC(ap[3]),
UC(ap[4]), UC(ap[5]), UC(ap[6]), UC(ap[7]),
UC(ap[8]), UC(ap[9]), UC(ap[10]), UC(ap[11]),
UC(ap[12]), UC(ap[13]), UC(ap[14]), UC(ap[15]),
2,
(ntohs(sin6->sin6_port) >> 8) & 0xff,
ntohs(sin6->sin6_port) & 0xff);
}
break;
default:
e = FTP_PROTOCOL_ERROR; /* XXX: error code should be prepared */
goto ouch;
}
if (e != FTP_OK)
goto ouch;
/* seek to required offset */
if (offset)
if (_ftp_cmd(cd, "REST %lu", (u_long)offset) != FTP_FILE_OK)
goto sysouch;
/* make the server initiate the transfer */
if (verbose)
_fetch_info("initiating transfer");
e = _ftp_cmd(cd, "%s %s", oper, _ftp_filename(file));
if (e != FTP_OPEN_DATA_CONNECTION)
goto ouch;
/* accept the incoming connection and go to town */
if ((d = accept(sd, NULL, NULL)) == -1)
goto sysouch;
close(sd);
sd = d;
}
if ((df = fdopen(sd, mode)) == NULL)
goto sysouch;
return df;
sysouch:
_fetch_syserr();
if (sd >= 0)
close(sd);
return NULL;
ouch:
if (e != -1)
_ftp_seterr(e);
if (sd >= 0)
close(sd);
return NULL;
}
/*
* Log on to FTP server
*/
static int
_ftp_connect(char *host, int port, char *user, char *pwd, char *flags)
{
int cd, e, pp = 0, direct, verbose;
#ifdef INET6
int af = AF_UNSPEC;
#else
int af = AF_INET;
#endif
char *p, *q;
const char *logname;
char localhost[MAXHOSTNAMELEN];
char pbuf[MAXHOSTNAMELEN + MAXLOGNAME + 1];
direct = (flags && strchr(flags, 'd'));
verbose = (flags && strchr(flags, 'v'));
if ((flags && strchr(flags, '4')))
af = AF_INET;
else if ((flags && strchr(flags, '6')))
af = AF_INET6;
/* check for proxy */
if (!direct && (p = getenv("FTP_PROXY")) != NULL) {
char c = 0;
#ifdef INET6
if (*p != '[' || (q = strchr(p + 1, ']')) == NULL ||
(*++q != '\0' && *q != ':'))
#endif
q = strchr(p, ':');
if (q != NULL && *q == ':') {
if (strspn(q+1, "0123456789") != strlen(q+1) || strlen(q+1) > 5) {
/* XXX we should emit some kind of warning */
}
pp = atoi(q+1);
if (pp < 1 || pp > 65535) {
/* XXX we should emit some kind of warning */
}
}
if (!pp) {
struct servent *se;
if ((se = getservbyname("ftp", "tcp")) != NULL)
pp = ntohs(se->s_port);
else
pp = FTP_DEFAULT_PORT;
}
if (q) {
#ifdef INET6
if (q > p && *p == '[' && *(q - 1) == ']') {
p++;
q--;
}
#endif
c = *q;
*q = 0;
}
cd = _fetch_connect(p, pp, af, verbose);
if (q)
*q = c;
} else {
/* no proxy, go straight to target */
cd = _fetch_connect(host, port, af, verbose);
p = NULL;
}
/* check connection */
if (cd == -1) {
_fetch_syserr();
return NULL;
}
/* expect welcome message */
if ((e = _ftp_chkerr(cd)) != FTP_SERVICE_READY)
goto fouch;
/* send user name and password */
if (!user || !*user)
user = FTP_ANONYMOUS_USER;
e = p ? _ftp_cmd(cd, "USER %s@%s@%d", user, host, port)
: _ftp_cmd(cd, "USER %s", user);
/* did the server request a password? */
if (e == FTP_NEED_PASSWORD) {
if (!pwd || !*pwd)
pwd = getenv("FTP_PASSWORD");
if (!pwd || !*pwd) {
if ((logname = getlogin()) == 0)
logname = FTP_ANONYMOUS_PASSWORD;
gethostname(localhost, sizeof localhost);
snprintf(pbuf, sizeof pbuf, "%s@%s", logname, localhost);
pwd = pbuf;
}
e = _ftp_cmd(cd, "PASS %s", pwd);
}
/* did the server request an account? */
if (e == FTP_NEED_ACCOUNT)
goto fouch;
/* we should be done by now */
if (e != FTP_LOGGED_IN)
goto fouch;
/* might as well select mode and type at once */
#ifdef FTP_FORCE_STREAM_MODE
if ((e = _ftp_cmd(cd, "MODE S")) != FTP_OK) /* default is S */
goto fouch;
#endif
if ((e = _ftp_cmd(cd, "TYPE I")) != FTP_OK) /* default is A */
goto fouch;
/* done */
return cd;
fouch:
if (e != -1)
_ftp_seterr(e);
close(cd);
return NULL;
}
/*
* Disconnect from server
*/
static void
_ftp_disconnect(int cd)
{
(void)_ftp_cmd(cd, "QUIT");
close(cd);
}
/*
* Check if we're already connected
*/
static int
_ftp_isconnected(struct url *url)
{
return (cached_socket
&& (strcmp(url->host, cached_host.host) == 0)
&& (strcmp(url->user, cached_host.user) == 0)
&& (strcmp(url->pwd, cached_host.pwd) == 0)
&& (url->port == cached_host.port));
}
/*
* Check the cache, reconnect if no luck
*/
static int
_ftp_cached_connect(struct url *url, char *flags)
{
int e, cd;
cd = -1;
/* set default port */
if (!url->port) {
struct servent *se;
if ((se = getservbyname("ftp", "tcp")) != NULL)
url->port = ntohs(se->s_port);
else
url->port = FTP_DEFAULT_PORT;
}
/* try to use previously cached connection */
if (_ftp_isconnected(url)) {
e = _ftp_cmd(cached_socket, "NOOP");
if (e == FTP_OK || e == FTP_SYNTAX_ERROR)
cd = cached_socket;
}
/* connect to server */
if (cd == -1) {
cd = _ftp_connect(url->host, url->port, url->user, url->pwd, flags);
if (cd == -1)
return -1;
if (cached_socket)
_ftp_disconnect(cached_socket);
cached_socket = cd;
memcpy(&cached_host, url, sizeof *url);
}
return cd;
}
/*
* Get and stat file
*/
FILE *
fetchXGetFTP(struct url *url, struct url_stat *us, char *flags)
{
int cd;
/* connect to server */
if ((cd = _ftp_cached_connect(url, flags)) == NULL)
return NULL;
/* change directory */
if (_ftp_cwd(cd, url->doc) == -1)
return NULL;
/* stat file */
if (us && _ftp_stat(cd, url->doc, us) == -1
&& fetchLastErrCode != FETCH_UNAVAIL)
return NULL;
/* initiate the transfer */
return _ftp_transfer(cd, "RETR", url->doc, "r", url->offset, flags);
}
/*
* Get file
*/
FILE *
fetchGetFTP(struct url *url, char *flags)
{
return fetchXGetFTP(url, NULL, flags);
}
/*
* Put file
*/
FILE *
fetchPutFTP(struct url *url, char *flags)
{
int cd;
/* connect to server */
if ((cd = _ftp_cached_connect(url, flags)) == NULL)
return NULL;
/* change directory */
if (_ftp_cwd(cd, url->doc) == -1)
return NULL;
/* initiate the transfer */
return _ftp_transfer(cd, (flags && strchr(flags, 'a')) ? "APPE" : "STOR",
url->doc, "w", url->offset, flags);
}
/*
* Get file stats
*/
int
fetchStatFTP(struct url *url, struct url_stat *us, char *flags)
{
int cd;
us->size = -1;
us->atime = us->mtime = 0;
/* connect to server */
if ((cd = _ftp_cached_connect(url, flags)) == NULL)
return -1;
/* change directory */
if (_ftp_cwd(cd, url->doc) == -1)
return -1;
/* stat file */
return _ftp_stat(cd, url->doc, us);
}
/*
* List a directory
*/
extern void warnx(char *, ...);
struct url_ent *
fetchListFTP(struct url *url, char *flags)
{
warnx("fetchListFTP(): not implemented");
return NULL;
}
|