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Import of OpenSSH 4.3p2
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3c0ef626 1/*
cdd66111 2 * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
3c0ef626 3 *
cdd66111 4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
3c0ef626 7 *
cdd66111 8 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
3c0ef626 15 */
16#include "includes.h"
2c06c99b 17RCSID("$OpenBSD: sftp-server.c,v 1.50 2006/01/02 01:20:31 djm Exp $");
3c0ef626 18
19#include "buffer.h"
20#include "bufaux.h"
21#include "getput.h"
22#include "log.h"
23#include "xmalloc.h"
2c06c99b 24#include "misc.h"
3c0ef626 25
26#include "sftp.h"
27#include "sftp-common.h"
28
29/* helper */
30#define get_int64() buffer_get_int64(&iqueue);
31#define get_int() buffer_get_int(&iqueue);
32#define get_string(lenp) buffer_get_string(&iqueue, lenp);
33#define TRACE debug
34
3c0ef626 35extern char *__progname;
3c0ef626 36
37/* input and output queue */
38Buffer iqueue;
39Buffer oqueue;
40
41/* Version of client */
42int version;
43
0fff78ff 44/* portable attributes, etc. */
3c0ef626 45
46typedef struct Stat Stat;
47
48struct Stat {
49 char *name;
50 char *long_name;
51 Attrib attrib;
52};
53
54static int
55errno_to_portable(int unixerrno)
56{
57 int ret = 0;
58
59 switch (unixerrno) {
60 case 0:
61 ret = SSH2_FX_OK;
62 break;
63 case ENOENT:
64 case ENOTDIR:
65 case EBADF:
66 case ELOOP:
67 ret = SSH2_FX_NO_SUCH_FILE;
68 break;
69 case EPERM:
70 case EACCES:
71 case EFAULT:
72 ret = SSH2_FX_PERMISSION_DENIED;
73 break;
74 case ENAMETOOLONG:
75 case EINVAL:
76 ret = SSH2_FX_BAD_MESSAGE;
77 break;
78 default:
79 ret = SSH2_FX_FAILURE;
80 break;
81 }
82 return ret;
83}
84
85static int
86flags_from_portable(int pflags)
87{
88 int flags = 0;
89
90 if ((pflags & SSH2_FXF_READ) &&
91 (pflags & SSH2_FXF_WRITE)) {
92 flags = O_RDWR;
93 } else if (pflags & SSH2_FXF_READ) {
94 flags = O_RDONLY;
95 } else if (pflags & SSH2_FXF_WRITE) {
96 flags = O_WRONLY;
97 }
98 if (pflags & SSH2_FXF_CREAT)
99 flags |= O_CREAT;
100 if (pflags & SSH2_FXF_TRUNC)
101 flags |= O_TRUNC;
102 if (pflags & SSH2_FXF_EXCL)
103 flags |= O_EXCL;
104 return flags;
105}
106
107static Attrib *
108get_attrib(void)
109{
110 return decode_attrib(&iqueue);
111}
112
113/* handle handles */
114
115typedef struct Handle Handle;
116struct Handle {
117 int use;
118 DIR *dirp;
119 int fd;
120 char *name;
121};
122
123enum {
124 HANDLE_UNUSED,
125 HANDLE_DIR,
126 HANDLE_FILE
127};
128
129Handle handles[100];
130
131static void
132handle_init(void)
133{
665a873d 134 u_int i;
3c0ef626 135
e9a17296 136 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++)
3c0ef626 137 handles[i].use = HANDLE_UNUSED;
138}
139
140static int
cdd66111 141handle_new(int use, const char *name, int fd, DIR *dirp)
3c0ef626 142{
665a873d 143 u_int i;
3c0ef626 144
e9a17296 145 for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) {
3c0ef626 146 if (handles[i].use == HANDLE_UNUSED) {
147 handles[i].use = use;
148 handles[i].dirp = dirp;
149 handles[i].fd = fd;
6a9b3198 150 handles[i].name = xstrdup(name);
3c0ef626 151 return i;
152 }
153 }
154 return -1;
155}
156
157static int
158handle_is_ok(int i, int type)
159{
665a873d 160 return i >= 0 && (u_int)i < sizeof(handles)/sizeof(Handle) &&
3c0ef626 161 handles[i].use == type;
162}
163
164static int
165handle_to_string(int handle, char **stringp, int *hlenp)
166{
167 if (stringp == NULL || hlenp == NULL)
168 return -1;
169 *stringp = xmalloc(sizeof(int32_t));
170 PUT_32BIT(*stringp, handle);
171 *hlenp = sizeof(int32_t);
172 return 0;
173}
174
175static int
cdd66111 176handle_from_string(const char *handle, u_int hlen)
3c0ef626 177{
178 int val;
179
180 if (hlen != sizeof(int32_t))
181 return -1;
182 val = GET_32BIT(handle);
183 if (handle_is_ok(val, HANDLE_FILE) ||
184 handle_is_ok(val, HANDLE_DIR))
185 return val;
186 return -1;
187}
188
189static char *
190handle_to_name(int handle)
191{
192 if (handle_is_ok(handle, HANDLE_DIR)||
193 handle_is_ok(handle, HANDLE_FILE))
194 return handles[handle].name;
195 return NULL;
196}
197
198static DIR *
199handle_to_dir(int handle)
200{
201 if (handle_is_ok(handle, HANDLE_DIR))
202 return handles[handle].dirp;
203 return NULL;
204}
205
206static int
207handle_to_fd(int handle)
208{
209 if (handle_is_ok(handle, HANDLE_FILE))
210 return handles[handle].fd;
211 return -1;
212}
213
214static int
215handle_close(int handle)
216{
217 int ret = -1;
218
219 if (handle_is_ok(handle, HANDLE_FILE)) {
220 ret = close(handles[handle].fd);
221 handles[handle].use = HANDLE_UNUSED;
6a9b3198 222 xfree(handles[handle].name);
3c0ef626 223 } else if (handle_is_ok(handle, HANDLE_DIR)) {
224 ret = closedir(handles[handle].dirp);
225 handles[handle].use = HANDLE_UNUSED;
6a9b3198 226 xfree(handles[handle].name);
3c0ef626 227 } else {
228 errno = ENOENT;
229 }
230 return ret;
231}
232
233static int
234get_handle(void)
235{
236 char *handle;
237 int val = -1;
238 u_int hlen;
239
240 handle = get_string(&hlen);
241 if (hlen < 256)
242 val = handle_from_string(handle, hlen);
243 xfree(handle);
244 return val;
245}
246
247/* send replies */
248
249static void
250send_msg(Buffer *m)
251{
252 int mlen = buffer_len(m);
253
254 buffer_put_int(&oqueue, mlen);
255 buffer_append(&oqueue, buffer_ptr(m), mlen);
256 buffer_consume(m, mlen);
257}
258
259static void
c9f39d2c 260send_status(u_int32_t id, u_int32_t status)
3c0ef626 261{
262 Buffer msg;
263 const char *status_messages[] = {
264 "Success", /* SSH_FX_OK */
265 "End of file", /* SSH_FX_EOF */
266 "No such file", /* SSH_FX_NO_SUCH_FILE */
267 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
268 "Failure", /* SSH_FX_FAILURE */
269 "Bad message", /* SSH_FX_BAD_MESSAGE */
270 "No connection", /* SSH_FX_NO_CONNECTION */
271 "Connection lost", /* SSH_FX_CONNECTION_LOST */
272 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
273 "Unknown error" /* Others */
274 };
275
c9f39d2c 276 TRACE("sent status id %u error %u", id, status);
3c0ef626 277 buffer_init(&msg);
278 buffer_put_char(&msg, SSH2_FXP_STATUS);
279 buffer_put_int(&msg, id);
c9f39d2c 280 buffer_put_int(&msg, status);
3c0ef626 281 if (version >= 3) {
282 buffer_put_cstring(&msg,
c9f39d2c 283 status_messages[MIN(status,SSH2_FX_MAX)]);
3c0ef626 284 buffer_put_cstring(&msg, "");
285 }
286 send_msg(&msg);
287 buffer_free(&msg);
288}
289static void
cdd66111 290send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
3c0ef626 291{
292 Buffer msg;
293
294 buffer_init(&msg);
295 buffer_put_char(&msg, type);
296 buffer_put_int(&msg, id);
297 buffer_put_string(&msg, data, dlen);
298 send_msg(&msg);
299 buffer_free(&msg);
300}
301
302static void
cdd66111 303send_data(u_int32_t id, const char *data, int dlen)
3c0ef626 304{
680cee3b 305 TRACE("sent data id %u len %d", id, dlen);
3c0ef626 306 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
307}
308
309static void
310send_handle(u_int32_t id, int handle)
311{
312 char *string;
313 int hlen;
314
315 handle_to_string(handle, &string, &hlen);
680cee3b 316 TRACE("sent handle id %u handle %d", id, handle);
3c0ef626 317 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
318 xfree(string);
319}
320
321static void
cdd66111 322send_names(u_int32_t id, int count, const Stat *stats)
3c0ef626 323{
324 Buffer msg;
325 int i;
326
327 buffer_init(&msg);
328 buffer_put_char(&msg, SSH2_FXP_NAME);
329 buffer_put_int(&msg, id);
330 buffer_put_int(&msg, count);
680cee3b 331 TRACE("sent names id %u count %d", id, count);
3c0ef626 332 for (i = 0; i < count; i++) {
333 buffer_put_cstring(&msg, stats[i].name);
334 buffer_put_cstring(&msg, stats[i].long_name);
335 encode_attrib(&msg, &stats[i].attrib);
336 }
337 send_msg(&msg);
338 buffer_free(&msg);
339}
340
341static void
cdd66111 342send_attrib(u_int32_t id, const Attrib *a)
3c0ef626 343{
344 Buffer msg;
345
680cee3b 346 TRACE("sent attrib id %u have 0x%x", id, a->flags);
3c0ef626 347 buffer_init(&msg);
348 buffer_put_char(&msg, SSH2_FXP_ATTRS);
349 buffer_put_int(&msg, id);
350 encode_attrib(&msg, a);
351 send_msg(&msg);
352 buffer_free(&msg);
353}
354
355/* parse incoming */
356
357static void
358process_init(void)
359{
360 Buffer msg;
361
f5799ae1 362 version = get_int();
3c0ef626 363 TRACE("client version %d", version);
364 buffer_init(&msg);
365 buffer_put_char(&msg, SSH2_FXP_VERSION);
366 buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
367 send_msg(&msg);
368 buffer_free(&msg);
369}
370
371static void
372process_open(void)
373{
374 u_int32_t id, pflags;
375 Attrib *a;
376 char *name;
377 int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
378
379 id = get_int();
380 name = get_string(NULL);
381 pflags = get_int(); /* portable flags */
382 a = get_attrib();
383 flags = flags_from_portable(pflags);
384 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
680cee3b 385 TRACE("open id %u name %s flags %d mode 0%o", id, name, pflags, mode);
3c0ef626 386 fd = open(name, flags, mode);
387 if (fd < 0) {
388 status = errno_to_portable(errno);
389 } else {
6a9b3198 390 handle = handle_new(HANDLE_FILE, name, fd, NULL);
3c0ef626 391 if (handle < 0) {
392 close(fd);
393 } else {
394 send_handle(id, handle);
395 status = SSH2_FX_OK;
396 }
397 }
398 if (status != SSH2_FX_OK)
399 send_status(id, status);
400 xfree(name);
401}
402
403static void
404process_close(void)
405{
406 u_int32_t id;
407 int handle, ret, status = SSH2_FX_FAILURE;
408
409 id = get_int();
410 handle = get_handle();
680cee3b 411 TRACE("close id %u handle %d", id, handle);
3c0ef626 412 ret = handle_close(handle);
413 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
414 send_status(id, status);
415}
416
417static void
418process_read(void)
419{
420 char buf[64*1024];
421 u_int32_t id, len;
422 int handle, fd, ret, status = SSH2_FX_FAILURE;
423 u_int64_t off;
424
425 id = get_int();
426 handle = get_handle();
427 off = get_int64();
428 len = get_int();
429
680cee3b 430 TRACE("read id %u handle %d off %llu len %d", id, handle,
2c06c99b 431 (unsigned long long)off, len);
3c0ef626 432 if (len > sizeof buf) {
433 len = sizeof buf;
0fff78ff 434 logit("read change len %d", len);
3c0ef626 435 }
436 fd = handle_to_fd(handle);
437 if (fd >= 0) {
438 if (lseek(fd, off, SEEK_SET) < 0) {
439 error("process_read: seek failed");
440 status = errno_to_portable(errno);
441 } else {
442 ret = read(fd, buf, len);
443 if (ret < 0) {
444 status = errno_to_portable(errno);
445 } else if (ret == 0) {
446 status = SSH2_FX_EOF;
447 } else {
448 send_data(id, buf, ret);
449 status = SSH2_FX_OK;
450 }
451 }
452 }
453 if (status != SSH2_FX_OK)
454 send_status(id, status);
455}
456
457static void
458process_write(void)
459{
460 u_int32_t id;
461 u_int64_t off;
462 u_int len;
463 int handle, fd, ret, status = SSH2_FX_FAILURE;
464 char *data;
465
466 id = get_int();
467 handle = get_handle();
468 off = get_int64();
469 data = get_string(&len);
470
680cee3b 471 TRACE("write id %u handle %d off %llu len %d", id, handle,
2c06c99b 472 (unsigned long long)off, len);
3c0ef626 473 fd = handle_to_fd(handle);
474 if (fd >= 0) {
475 if (lseek(fd, off, SEEK_SET) < 0) {
476 status = errno_to_portable(errno);
477 error("process_write: seek failed");
478 } else {
479/* XXX ATOMICIO ? */
480 ret = write(fd, data, len);
665a873d 481 if (ret < 0) {
3c0ef626 482 error("process_write: write failed");
483 status = errno_to_portable(errno);
665a873d 484 } else if ((size_t)ret == len) {
3c0ef626 485 status = SSH2_FX_OK;
486 } else {
0fff78ff 487 logit("nothing at all written");
3c0ef626 488 }
489 }
490 }
491 send_status(id, status);
492 xfree(data);
493}
494
495static void
496process_do_stat(int do_lstat)
497{
498 Attrib a;
499 struct stat st;
500 u_int32_t id;
501 char *name;
502 int ret, status = SSH2_FX_FAILURE;
503
504 id = get_int();
505 name = get_string(NULL);
680cee3b 506 TRACE("%sstat id %u name %s", do_lstat ? "l" : "", id, name);
3c0ef626 507 ret = do_lstat ? lstat(name, &st) : stat(name, &st);
508 if (ret < 0) {
509 status = errno_to_portable(errno);
510 } else {
511 stat_to_attrib(&st, &a);
512 send_attrib(id, &a);
513 status = SSH2_FX_OK;
514 }
515 if (status != SSH2_FX_OK)
516 send_status(id, status);
517 xfree(name);
518}
519
520static void
521process_stat(void)
522{
523 process_do_stat(0);
524}
525
526static void
527process_lstat(void)
528{
529 process_do_stat(1);
530}
531
532static void
533process_fstat(void)
534{
535 Attrib a;
536 struct stat st;
537 u_int32_t id;
538 int fd, ret, handle, status = SSH2_FX_FAILURE;
539
540 id = get_int();
541 handle = get_handle();
680cee3b 542 TRACE("fstat id %u handle %d", id, handle);
3c0ef626 543 fd = handle_to_fd(handle);
544 if (fd >= 0) {
545 ret = fstat(fd, &st);
546 if (ret < 0) {
547 status = errno_to_portable(errno);
548 } else {
549 stat_to_attrib(&st, &a);
550 send_attrib(id, &a);
551 status = SSH2_FX_OK;
552 }
553 }
554 if (status != SSH2_FX_OK)
555 send_status(id, status);
556}
557
558static struct timeval *
cdd66111 559attrib_to_tv(const Attrib *a)
3c0ef626 560{
561 static struct timeval tv[2];
562
563 tv[0].tv_sec = a->atime;
564 tv[0].tv_usec = 0;
565 tv[1].tv_sec = a->mtime;
566 tv[1].tv_usec = 0;
567 return tv;
568}
569
570static void
571process_setstat(void)
572{
573 Attrib *a;
574 u_int32_t id;
575 char *name;
680cee3b 576 int status = SSH2_FX_OK, ret;
3c0ef626 577
578 id = get_int();
579 name = get_string(NULL);
580 a = get_attrib();
680cee3b 581 TRACE("setstat id %u name %s", id, name);
e9a17296 582 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
583 ret = truncate(name, a->size);
584 if (ret == -1)
585 status = errno_to_portable(errno);
586 }
3c0ef626 587 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
588 ret = chmod(name, a->perm & 0777);
589 if (ret == -1)
590 status = errno_to_portable(errno);
591 }
592 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
593 ret = utimes(name, attrib_to_tv(a));
594 if (ret == -1)
595 status = errno_to_portable(errno);
596 }
597 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
598 ret = chown(name, a->uid, a->gid);
599 if (ret == -1)
600 status = errno_to_portable(errno);
601 }
602 send_status(id, status);
603 xfree(name);
604}
605
606static void
607process_fsetstat(void)
608{
609 Attrib *a;
610 u_int32_t id;
611 int handle, fd, ret;
612 int status = SSH2_FX_OK;
613 char *name;
614
615 id = get_int();
616 handle = get_handle();
617 a = get_attrib();
680cee3b 618 TRACE("fsetstat id %u handle %d", id, handle);
3c0ef626 619 fd = handle_to_fd(handle);
620 name = handle_to_name(handle);
621 if (fd < 0 || name == NULL) {
622 status = SSH2_FX_FAILURE;
623 } else {
e9a17296 624 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
625 ret = ftruncate(fd, a->size);
626 if (ret == -1)
627 status = errno_to_portable(errno);
628 }
3c0ef626 629 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
630#ifdef HAVE_FCHMOD
631 ret = fchmod(fd, a->perm & 0777);
632#else
633 ret = chmod(name, a->perm & 0777);
634#endif
635 if (ret == -1)
636 status = errno_to_portable(errno);
637 }
638 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
639#ifdef HAVE_FUTIMES
640 ret = futimes(fd, attrib_to_tv(a));
641#else
642 ret = utimes(name, attrib_to_tv(a));
643#endif
644 if (ret == -1)
645 status = errno_to_portable(errno);
646 }
647 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
648#ifdef HAVE_FCHOWN
649 ret = fchown(fd, a->uid, a->gid);
650#else
651 ret = chown(name, a->uid, a->gid);
652#endif
653 if (ret == -1)
654 status = errno_to_portable(errno);
655 }
656 }
657 send_status(id, status);
658}
659
660static void
661process_opendir(void)
662{
663 DIR *dirp = NULL;
664 char *path;
665 int handle, status = SSH2_FX_FAILURE;
666 u_int32_t id;
667
668 id = get_int();
669 path = get_string(NULL);
680cee3b 670 TRACE("opendir id %u path %s", id, path);
3c0ef626 671 dirp = opendir(path);
672 if (dirp == NULL) {
673 status = errno_to_portable(errno);
674 } else {
6a9b3198 675 handle = handle_new(HANDLE_DIR, path, 0, dirp);
3c0ef626 676 if (handle < 0) {
677 closedir(dirp);
678 } else {
679 send_handle(id, handle);
680 status = SSH2_FX_OK;
681 }
682
683 }
684 if (status != SSH2_FX_OK)
685 send_status(id, status);
686 xfree(path);
687}
688
3c0ef626 689static void
690process_readdir(void)
691{
692 DIR *dirp;
693 struct dirent *dp;
694 char *path;
695 int handle;
696 u_int32_t id;
697
698 id = get_int();
699 handle = get_handle();
680cee3b 700 TRACE("readdir id %u handle %d", id, handle);
3c0ef626 701 dirp = handle_to_dir(handle);
702 path = handle_to_name(handle);
703 if (dirp == NULL || path == NULL) {
704 send_status(id, SSH2_FX_FAILURE);
705 } else {
706 struct stat st;
707 char pathname[1024];
708 Stat *stats;
709 int nstats = 10, count = 0, i;
680cee3b 710
3c0ef626 711 stats = xmalloc(nstats * sizeof(Stat));
712 while ((dp = readdir(dirp)) != NULL) {
713 if (count >= nstats) {
714 nstats *= 2;
715 stats = xrealloc(stats, nstats * sizeof(Stat));
716 }
717/* XXX OVERFLOW ? */
718 snprintf(pathname, sizeof pathname, "%s%s%s", path,
719 strcmp(path, "/") ? "/" : "", dp->d_name);
720 if (lstat(pathname, &st) < 0)
721 continue;
722 stat_to_attrib(&st, &(stats[count].attrib));
723 stats[count].name = xstrdup(dp->d_name);
41b2f314 724 stats[count].long_name = ls_file(dp->d_name, &st, 0);
3c0ef626 725 count++;
726 /* send up to 100 entries in one message */
727 /* XXX check packet size instead */
728 if (count == 100)
729 break;
730 }
731 if (count > 0) {
732 send_names(id, count, stats);
e9a17296 733 for (i = 0; i < count; i++) {
3c0ef626 734 xfree(stats[i].name);
735 xfree(stats[i].long_name);
736 }
737 } else {
738 send_status(id, SSH2_FX_EOF);
739 }
740 xfree(stats);
741 }
742}
743
744static void
745process_remove(void)
746{
747 char *name;
748 u_int32_t id;
749 int status = SSH2_FX_FAILURE;
750 int ret;
751
752 id = get_int();
753 name = get_string(NULL);
680cee3b 754 TRACE("remove id %u name %s", id, name);
3c0ef626 755 ret = unlink(name);
756 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
757 send_status(id, status);
758 xfree(name);
759}
760
761static void
762process_mkdir(void)
763{
764 Attrib *a;
765 u_int32_t id;
766 char *name;
767 int ret, mode, status = SSH2_FX_FAILURE;
768
769 id = get_int();
770 name = get_string(NULL);
771 a = get_attrib();
772 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
773 a->perm & 0777 : 0777;
680cee3b 774 TRACE("mkdir id %u name %s mode 0%o", id, name, mode);
3c0ef626 775 ret = mkdir(name, mode);
776 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
777 send_status(id, status);
778 xfree(name);
779}
780
781static void
782process_rmdir(void)
783{
784 u_int32_t id;
785 char *name;
786 int ret, status;
787
788 id = get_int();
789 name = get_string(NULL);
680cee3b 790 TRACE("rmdir id %u name %s", id, name);
3c0ef626 791 ret = rmdir(name);
792 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
793 send_status(id, status);
794 xfree(name);
795}
796
797static void
798process_realpath(void)
799{
800 char resolvedname[MAXPATHLEN];
801 u_int32_t id;
802 char *path;
803
804 id = get_int();
805 path = get_string(NULL);
806 if (path[0] == '\0') {
807 xfree(path);
808 path = xstrdup(".");
809 }
680cee3b 810 TRACE("realpath id %u path %s", id, path);
3c0ef626 811 if (realpath(path, resolvedname) == NULL) {
812 send_status(id, errno_to_portable(errno));
813 } else {
814 Stat s;
815 attrib_clear(&s.attrib);
816 s.name = s.long_name = resolvedname;
817 send_names(id, 1, &s);
818 }
819 xfree(path);
820}
821
822static void
823process_rename(void)
824{
825 u_int32_t id;
3c0ef626 826 char *oldpath, *newpath;
6a9b3198 827 int status;
828 struct stat sb;
3c0ef626 829
830 id = get_int();
831 oldpath = get_string(NULL);
832 newpath = get_string(NULL);
680cee3b 833 TRACE("rename id %u old %s new %s", id, oldpath, newpath);
6a9b3198 834 status = SSH2_FX_FAILURE;
835 if (lstat(oldpath, &sb) == -1)
836 status = errno_to_portable(errno);
837 else if (S_ISREG(sb.st_mode)) {
838 /* Race-free rename of regular files */
c9f39d2c 839 if (link(oldpath, newpath) == -1) {
840 if (errno == EOPNOTSUPP
841#ifdef LINK_OPNOTSUPP_ERRNO
842 || errno == LINK_OPNOTSUPP_ERRNO
843#endif
844 ) {
845 struct stat st;
846
847 /*
848 * fs doesn't support links, so fall back to
849 * stat+rename. This is racy.
850 */
851 if (stat(newpath, &st) == -1) {
852 if (rename(oldpath, newpath) == -1)
853 status =
854 errno_to_portable(errno);
855 else
856 status = SSH2_FX_OK;
857 }
858 } else {
859 status = errno_to_portable(errno);
860 }
861 } else if (unlink(oldpath) == -1) {
6a9b3198 862 status = errno_to_portable(errno);
863 /* clean spare link */
864 unlink(newpath);
865 } else
866 status = SSH2_FX_OK;
867 } else if (stat(newpath, &sb) == -1) {
868 if (rename(oldpath, newpath) == -1)
869 status = errno_to_portable(errno);
870 else
871 status = SSH2_FX_OK;
3c0ef626 872 }
873 send_status(id, status);
874 xfree(oldpath);
875 xfree(newpath);
876}
877
878static void
879process_readlink(void)
880{
881 u_int32_t id;
882 int len;
c9f39d2c 883 char buf[MAXPATHLEN];
3c0ef626 884 char *path;
885
886 id = get_int();
887 path = get_string(NULL);
680cee3b 888 TRACE("readlink id %u path %s", id, path);
c9f39d2c 889 if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
3c0ef626 890 send_status(id, errno_to_portable(errno));
891 else {
892 Stat s;
e9a17296 893
c9f39d2c 894 buf[len] = '\0';
3c0ef626 895 attrib_clear(&s.attrib);
c9f39d2c 896 s.name = s.long_name = buf;
3c0ef626 897 send_names(id, 1, &s);
898 }
899 xfree(path);
900}
901
902static void
903process_symlink(void)
904{
905 u_int32_t id;
3c0ef626 906 char *oldpath, *newpath;
6a9b3198 907 int ret, status;
3c0ef626 908
909 id = get_int();
910 oldpath = get_string(NULL);
911 newpath = get_string(NULL);
680cee3b 912 TRACE("symlink id %u old %s new %s", id, oldpath, newpath);
6a9b3198 913 /* this will fail if 'newpath' exists */
914 ret = symlink(oldpath, newpath);
915 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
3c0ef626 916 send_status(id, status);
917 xfree(oldpath);
918 xfree(newpath);
919}
920
921static void
922process_extended(void)
923{
924 u_int32_t id;
925 char *request;
926
927 id = get_int();
928 request = get_string(NULL);
929 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
930 xfree(request);
931}
932
933/* stolen from ssh-agent */
934
935static void
936process(void)
937{
938 u_int msg_len;
f5799ae1 939 u_int buf_len;
940 u_int consumed;
3c0ef626 941 u_int type;
942 u_char *cp;
943
f5799ae1 944 buf_len = buffer_len(&iqueue);
945 if (buf_len < 5)
3c0ef626 946 return; /* Incomplete message. */
e9a17296 947 cp = buffer_ptr(&iqueue);
3c0ef626 948 msg_len = GET_32BIT(cp);
2c06c99b 949 if (msg_len > SFTP_MAX_MSG_LENGTH) {
3c0ef626 950 error("bad message ");
951 exit(11);
952 }
f5799ae1 953 if (buf_len < msg_len + 4)
3c0ef626 954 return;
955 buffer_consume(&iqueue, 4);
f5799ae1 956 buf_len -= 4;
3c0ef626 957 type = buffer_get_char(&iqueue);
958 switch (type) {
959 case SSH2_FXP_INIT:
960 process_init();
961 break;
962 case SSH2_FXP_OPEN:
963 process_open();
964 break;
965 case SSH2_FXP_CLOSE:
966 process_close();
967 break;
968 case SSH2_FXP_READ:
969 process_read();
970 break;
971 case SSH2_FXP_WRITE:
972 process_write();
973 break;
974 case SSH2_FXP_LSTAT:
975 process_lstat();
976 break;
977 case SSH2_FXP_FSTAT:
978 process_fstat();
979 break;
980 case SSH2_FXP_SETSTAT:
981 process_setstat();
982 break;
983 case SSH2_FXP_FSETSTAT:
984 process_fsetstat();
985 break;
986 case SSH2_FXP_OPENDIR:
987 process_opendir();
988 break;
989 case SSH2_FXP_READDIR:
990 process_readdir();
991 break;
992 case SSH2_FXP_REMOVE:
993 process_remove();
994 break;
995 case SSH2_FXP_MKDIR:
996 process_mkdir();
997 break;
998 case SSH2_FXP_RMDIR:
999 process_rmdir();
1000 break;
1001 case SSH2_FXP_REALPATH:
1002 process_realpath();
1003 break;
1004 case SSH2_FXP_STAT:
1005 process_stat();
1006 break;
1007 case SSH2_FXP_RENAME:
1008 process_rename();
1009 break;
1010 case SSH2_FXP_READLINK:
1011 process_readlink();
1012 break;
1013 case SSH2_FXP_SYMLINK:
1014 process_symlink();
1015 break;
1016 case SSH2_FXP_EXTENDED:
1017 process_extended();
1018 break;
1019 default:
1020 error("Unknown message %d", type);
1021 break;
1022 }
f5799ae1 1023 /* discard the remaining bytes from the current packet */
1024 if (buf_len < buffer_len(&iqueue))
1025 fatal("iqueue grows");
1026 consumed = buf_len - buffer_len(&iqueue);
1027 if (msg_len < consumed)
1028 fatal("msg_len %d < consumed %d", msg_len, consumed);
1029 if (msg_len > consumed)
1030 buffer_consume(&iqueue, msg_len - consumed);
3c0ef626 1031}
1032
1033int
1034main(int ac, char **av)
1035{
1036 fd_set *rset, *wset;
1037 int in, out, max;
1038 ssize_t len, olen, set_size;
1039
2c06c99b 1040 /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */
1041 sanitise_stdfd();
1042
3c0ef626 1043 /* XXX should use getopt */
1044
0fff78ff 1045 __progname = ssh_get_progname(av[0]);
3c0ef626 1046 handle_init();
1047
1048#ifdef DEBUG_SFTP_SERVER
1049 log_init("sftp-server", SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 0);
1050#endif
1051
1052 in = dup(STDIN_FILENO);
1053 out = dup(STDOUT_FILENO);
1054
1055#ifdef HAVE_CYGWIN
1056 setmode(in, O_BINARY);
1057 setmode(out, O_BINARY);
1058#endif
1059
1060 max = 0;
1061 if (in > max)
1062 max = in;
1063 if (out > max)
1064 max = out;
1065
1066 buffer_init(&iqueue);
1067 buffer_init(&oqueue);
1068
1069 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1070 rset = (fd_set *)xmalloc(set_size);
1071 wset = (fd_set *)xmalloc(set_size);
1072
1073 for (;;) {
1074 memset(rset, 0, set_size);
1075 memset(wset, 0, set_size);
1076
1077 FD_SET(in, rset);
1078 olen = buffer_len(&oqueue);
1079 if (olen > 0)
1080 FD_SET(out, wset);
1081
1082 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1083 if (errno == EINTR)
1084 continue;
1085 exit(2);
1086 }
1087
1088 /* copy stdin to iqueue */
1089 if (FD_ISSET(in, rset)) {
1090 char buf[4*4096];
1091 len = read(in, buf, sizeof buf);
1092 if (len == 0) {
1093 debug("read eof");
1094 exit(0);
1095 } else if (len < 0) {
1096 error("read error");
1097 exit(1);
1098 } else {
1099 buffer_append(&iqueue, buf, len);
1100 }
1101 }
1102 /* send oqueue to stdout */
1103 if (FD_ISSET(out, wset)) {
1104 len = write(out, buffer_ptr(&oqueue), olen);
1105 if (len < 0) {
1106 error("write error");
1107 exit(1);
1108 } else {
1109 buffer_consume(&oqueue, len);
1110 }
1111 }
1112 /* process requests from client */
1113 process();
1114 }
1115}
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