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[gssapi-openssh.git] / openssh / sftp-server.c
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3c0ef626 1/*
2 * Copyright (c) 2000, 2001 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24#include "includes.h"
25RCSID("$OpenBSD: sftp-server.c,v 1.30 2001/07/31 12:42:50 jakob Exp $");
26
27#include "buffer.h"
28#include "bufaux.h"
29#include "getput.h"
30#include "log.h"
31#include "xmalloc.h"
32
33#include "sftp.h"
34#include "sftp-common.h"
35
36/* helper */
37#define get_int64() buffer_get_int64(&iqueue);
38#define get_int() buffer_get_int(&iqueue);
39#define get_string(lenp) buffer_get_string(&iqueue, lenp);
40#define TRACE debug
41
42#ifdef HAVE___PROGNAME
43extern char *__progname;
44#else
45char *__progname;
46#endif
47
48/* input and output queue */
49Buffer iqueue;
50Buffer oqueue;
51
52/* Version of client */
53int version;
54
55/* portable attibutes, etc. */
56
57typedef struct Stat Stat;
58
59struct Stat {
60 char *name;
61 char *long_name;
62 Attrib attrib;
63};
64
65static int
66errno_to_portable(int unixerrno)
67{
68 int ret = 0;
69
70 switch (unixerrno) {
71 case 0:
72 ret = SSH2_FX_OK;
73 break;
74 case ENOENT:
75 case ENOTDIR:
76 case EBADF:
77 case ELOOP:
78 ret = SSH2_FX_NO_SUCH_FILE;
79 break;
80 case EPERM:
81 case EACCES:
82 case EFAULT:
83 ret = SSH2_FX_PERMISSION_DENIED;
84 break;
85 case ENAMETOOLONG:
86 case EINVAL:
87 ret = SSH2_FX_BAD_MESSAGE;
88 break;
89 default:
90 ret = SSH2_FX_FAILURE;
91 break;
92 }
93 return ret;
94}
95
96static int
97flags_from_portable(int pflags)
98{
99 int flags = 0;
100
101 if ((pflags & SSH2_FXF_READ) &&
102 (pflags & SSH2_FXF_WRITE)) {
103 flags = O_RDWR;
104 } else if (pflags & SSH2_FXF_READ) {
105 flags = O_RDONLY;
106 } else if (pflags & SSH2_FXF_WRITE) {
107 flags = O_WRONLY;
108 }
109 if (pflags & SSH2_FXF_CREAT)
110 flags |= O_CREAT;
111 if (pflags & SSH2_FXF_TRUNC)
112 flags |= O_TRUNC;
113 if (pflags & SSH2_FXF_EXCL)
114 flags |= O_EXCL;
115 return flags;
116}
117
118static Attrib *
119get_attrib(void)
120{
121 return decode_attrib(&iqueue);
122}
123
124/* handle handles */
125
126typedef struct Handle Handle;
127struct Handle {
128 int use;
129 DIR *dirp;
130 int fd;
131 char *name;
132};
133
134enum {
135 HANDLE_UNUSED,
136 HANDLE_DIR,
137 HANDLE_FILE
138};
139
140Handle handles[100];
141
142static void
143handle_init(void)
144{
145 int i;
146
147 for(i = 0; i < sizeof(handles)/sizeof(Handle); i++)
148 handles[i].use = HANDLE_UNUSED;
149}
150
151static int
152handle_new(int use, char *name, int fd, DIR *dirp)
153{
154 int i;
155
156 for(i = 0; i < sizeof(handles)/sizeof(Handle); i++) {
157 if (handles[i].use == HANDLE_UNUSED) {
158 handles[i].use = use;
159 handles[i].dirp = dirp;
160 handles[i].fd = fd;
161 handles[i].name = name;
162 return i;
163 }
164 }
165 return -1;
166}
167
168static int
169handle_is_ok(int i, int type)
170{
171 return i >= 0 && i < sizeof(handles)/sizeof(Handle) &&
172 handles[i].use == type;
173}
174
175static int
176handle_to_string(int handle, char **stringp, int *hlenp)
177{
178 if (stringp == NULL || hlenp == NULL)
179 return -1;
180 *stringp = xmalloc(sizeof(int32_t));
181 PUT_32BIT(*stringp, handle);
182 *hlenp = sizeof(int32_t);
183 return 0;
184}
185
186static int
187handle_from_string(char *handle, u_int hlen)
188{
189 int val;
190
191 if (hlen != sizeof(int32_t))
192 return -1;
193 val = GET_32BIT(handle);
194 if (handle_is_ok(val, HANDLE_FILE) ||
195 handle_is_ok(val, HANDLE_DIR))
196 return val;
197 return -1;
198}
199
200static char *
201handle_to_name(int handle)
202{
203 if (handle_is_ok(handle, HANDLE_DIR)||
204 handle_is_ok(handle, HANDLE_FILE))
205 return handles[handle].name;
206 return NULL;
207}
208
209static DIR *
210handle_to_dir(int handle)
211{
212 if (handle_is_ok(handle, HANDLE_DIR))
213 return handles[handle].dirp;
214 return NULL;
215}
216
217static int
218handle_to_fd(int handle)
219{
220 if (handle_is_ok(handle, HANDLE_FILE))
221 return handles[handle].fd;
222 return -1;
223}
224
225static int
226handle_close(int handle)
227{
228 int ret = -1;
229
230 if (handle_is_ok(handle, HANDLE_FILE)) {
231 ret = close(handles[handle].fd);
232 handles[handle].use = HANDLE_UNUSED;
233 } else if (handle_is_ok(handle, HANDLE_DIR)) {
234 ret = closedir(handles[handle].dirp);
235 handles[handle].use = HANDLE_UNUSED;
236 } else {
237 errno = ENOENT;
238 }
239 return ret;
240}
241
242static int
243get_handle(void)
244{
245 char *handle;
246 int val = -1;
247 u_int hlen;
248
249 handle = get_string(&hlen);
250 if (hlen < 256)
251 val = handle_from_string(handle, hlen);
252 xfree(handle);
253 return val;
254}
255
256/* send replies */
257
258static void
259send_msg(Buffer *m)
260{
261 int mlen = buffer_len(m);
262
263 buffer_put_int(&oqueue, mlen);
264 buffer_append(&oqueue, buffer_ptr(m), mlen);
265 buffer_consume(m, mlen);
266}
267
268static void
269send_status(u_int32_t id, u_int32_t error)
270{
271 Buffer msg;
272 const char *status_messages[] = {
273 "Success", /* SSH_FX_OK */
274 "End of file", /* SSH_FX_EOF */
275 "No such file", /* SSH_FX_NO_SUCH_FILE */
276 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
277 "Failure", /* SSH_FX_FAILURE */
278 "Bad message", /* SSH_FX_BAD_MESSAGE */
279 "No connection", /* SSH_FX_NO_CONNECTION */
280 "Connection lost", /* SSH_FX_CONNECTION_LOST */
281 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
282 "Unknown error" /* Others */
283 };
284
285 TRACE("sent status id %d error %d", id, error);
286 buffer_init(&msg);
287 buffer_put_char(&msg, SSH2_FXP_STATUS);
288 buffer_put_int(&msg, id);
289 buffer_put_int(&msg, error);
290 if (version >= 3) {
291 buffer_put_cstring(&msg,
292 status_messages[MIN(error,SSH2_FX_MAX)]);
293 buffer_put_cstring(&msg, "");
294 }
295 send_msg(&msg);
296 buffer_free(&msg);
297}
298static void
299send_data_or_handle(char type, u_int32_t id, char *data, int dlen)
300{
301 Buffer msg;
302
303 buffer_init(&msg);
304 buffer_put_char(&msg, type);
305 buffer_put_int(&msg, id);
306 buffer_put_string(&msg, data, dlen);
307 send_msg(&msg);
308 buffer_free(&msg);
309}
310
311static void
312send_data(u_int32_t id, char *data, int dlen)
313{
314 TRACE("sent data id %d len %d", id, dlen);
315 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
316}
317
318static void
319send_handle(u_int32_t id, int handle)
320{
321 char *string;
322 int hlen;
323
324 handle_to_string(handle, &string, &hlen);
325 TRACE("sent handle id %d handle %d", id, handle);
326 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
327 xfree(string);
328}
329
330static void
331send_names(u_int32_t id, int count, Stat *stats)
332{
333 Buffer msg;
334 int i;
335
336 buffer_init(&msg);
337 buffer_put_char(&msg, SSH2_FXP_NAME);
338 buffer_put_int(&msg, id);
339 buffer_put_int(&msg, count);
340 TRACE("sent names id %d count %d", id, count);
341 for (i = 0; i < count; i++) {
342 buffer_put_cstring(&msg, stats[i].name);
343 buffer_put_cstring(&msg, stats[i].long_name);
344 encode_attrib(&msg, &stats[i].attrib);
345 }
346 send_msg(&msg);
347 buffer_free(&msg);
348}
349
350static void
351send_attrib(u_int32_t id, Attrib *a)
352{
353 Buffer msg;
354
355 TRACE("sent attrib id %d have 0x%x", id, a->flags);
356 buffer_init(&msg);
357 buffer_put_char(&msg, SSH2_FXP_ATTRS);
358 buffer_put_int(&msg, id);
359 encode_attrib(&msg, a);
360 send_msg(&msg);
361 buffer_free(&msg);
362}
363
364/* parse incoming */
365
366static void
367process_init(void)
368{
369 Buffer msg;
370
371 version = buffer_get_int(&iqueue);
372 TRACE("client version %d", version);
373 buffer_init(&msg);
374 buffer_put_char(&msg, SSH2_FXP_VERSION);
375 buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
376 send_msg(&msg);
377 buffer_free(&msg);
378}
379
380static void
381process_open(void)
382{
383 u_int32_t id, pflags;
384 Attrib *a;
385 char *name;
386 int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
387
388 id = get_int();
389 name = get_string(NULL);
390 pflags = get_int(); /* portable flags */
391 a = get_attrib();
392 flags = flags_from_portable(pflags);
393 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
394 TRACE("open id %d name %s flags %d mode 0%o", id, name, pflags, mode);
395 fd = open(name, flags, mode);
396 if (fd < 0) {
397 status = errno_to_portable(errno);
398 } else {
399 handle = handle_new(HANDLE_FILE, xstrdup(name), fd, NULL);
400 if (handle < 0) {
401 close(fd);
402 } else {
403 send_handle(id, handle);
404 status = SSH2_FX_OK;
405 }
406 }
407 if (status != SSH2_FX_OK)
408 send_status(id, status);
409 xfree(name);
410}
411
412static void
413process_close(void)
414{
415 u_int32_t id;
416 int handle, ret, status = SSH2_FX_FAILURE;
417
418 id = get_int();
419 handle = get_handle();
420 TRACE("close id %d handle %d", id, handle);
421 ret = handle_close(handle);
422 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
423 send_status(id, status);
424}
425
426static void
427process_read(void)
428{
429 char buf[64*1024];
430 u_int32_t id, len;
431 int handle, fd, ret, status = SSH2_FX_FAILURE;
432 u_int64_t off;
433
434 id = get_int();
435 handle = get_handle();
436 off = get_int64();
437 len = get_int();
438
439 TRACE("read id %d handle %d off %llu len %d", id, handle,
440 (u_int64_t)off, len);
441 if (len > sizeof buf) {
442 len = sizeof buf;
443 log("read change len %d", len);
444 }
445 fd = handle_to_fd(handle);
446 if (fd >= 0) {
447 if (lseek(fd, off, SEEK_SET) < 0) {
448 error("process_read: seek failed");
449 status = errno_to_portable(errno);
450 } else {
451 ret = read(fd, buf, len);
452 if (ret < 0) {
453 status = errno_to_portable(errno);
454 } else if (ret == 0) {
455 status = SSH2_FX_EOF;
456 } else {
457 send_data(id, buf, ret);
458 status = SSH2_FX_OK;
459 }
460 }
461 }
462 if (status != SSH2_FX_OK)
463 send_status(id, status);
464}
465
466static void
467process_write(void)
468{
469 u_int32_t id;
470 u_int64_t off;
471 u_int len;
472 int handle, fd, ret, status = SSH2_FX_FAILURE;
473 char *data;
474
475 id = get_int();
476 handle = get_handle();
477 off = get_int64();
478 data = get_string(&len);
479
480 TRACE("write id %d handle %d off %llu len %d", id, handle,
481 (u_int64_t)off, len);
482 fd = handle_to_fd(handle);
483 if (fd >= 0) {
484 if (lseek(fd, off, SEEK_SET) < 0) {
485 status = errno_to_portable(errno);
486 error("process_write: seek failed");
487 } else {
488/* XXX ATOMICIO ? */
489 ret = write(fd, data, len);
490 if (ret == -1) {
491 error("process_write: write failed");
492 status = errno_to_portable(errno);
493 } else if (ret == len) {
494 status = SSH2_FX_OK;
495 } else {
496 log("nothing at all written");
497 }
498 }
499 }
500 send_status(id, status);
501 xfree(data);
502}
503
504static void
505process_do_stat(int do_lstat)
506{
507 Attrib a;
508 struct stat st;
509 u_int32_t id;
510 char *name;
511 int ret, status = SSH2_FX_FAILURE;
512
513 id = get_int();
514 name = get_string(NULL);
515 TRACE("%sstat id %d name %s", do_lstat ? "l" : "", id, name);
516 ret = do_lstat ? lstat(name, &st) : stat(name, &st);
517 if (ret < 0) {
518 status = errno_to_portable(errno);
519 } else {
520 stat_to_attrib(&st, &a);
521 send_attrib(id, &a);
522 status = SSH2_FX_OK;
523 }
524 if (status != SSH2_FX_OK)
525 send_status(id, status);
526 xfree(name);
527}
528
529static void
530process_stat(void)
531{
532 process_do_stat(0);
533}
534
535static void
536process_lstat(void)
537{
538 process_do_stat(1);
539}
540
541static void
542process_fstat(void)
543{
544 Attrib a;
545 struct stat st;
546 u_int32_t id;
547 int fd, ret, handle, status = SSH2_FX_FAILURE;
548
549 id = get_int();
550 handle = get_handle();
551 TRACE("fstat id %d handle %d", id, handle);
552 fd = handle_to_fd(handle);
553 if (fd >= 0) {
554 ret = fstat(fd, &st);
555 if (ret < 0) {
556 status = errno_to_portable(errno);
557 } else {
558 stat_to_attrib(&st, &a);
559 send_attrib(id, &a);
560 status = SSH2_FX_OK;
561 }
562 }
563 if (status != SSH2_FX_OK)
564 send_status(id, status);
565}
566
567static struct timeval *
568attrib_to_tv(Attrib *a)
569{
570 static struct timeval tv[2];
571
572 tv[0].tv_sec = a->atime;
573 tv[0].tv_usec = 0;
574 tv[1].tv_sec = a->mtime;
575 tv[1].tv_usec = 0;
576 return tv;
577}
578
579static void
580process_setstat(void)
581{
582 Attrib *a;
583 u_int32_t id;
584 char *name;
585 int ret;
586 int status = SSH2_FX_OK;
587
588 id = get_int();
589 name = get_string(NULL);
590 a = get_attrib();
591 TRACE("setstat id %d name %s", id, name);
592 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
593 ret = chmod(name, a->perm & 0777);
594 if (ret == -1)
595 status = errno_to_portable(errno);
596 }
597 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
598 ret = utimes(name, attrib_to_tv(a));
599 if (ret == -1)
600 status = errno_to_portable(errno);
601 }
602 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
603 ret = chown(name, a->uid, a->gid);
604 if (ret == -1)
605 status = errno_to_portable(errno);
606 }
607 send_status(id, status);
608 xfree(name);
609}
610
611static void
612process_fsetstat(void)
613{
614 Attrib *a;
615 u_int32_t id;
616 int handle, fd, ret;
617 int status = SSH2_FX_OK;
618 char *name;
619
620 id = get_int();
621 handle = get_handle();
622 a = get_attrib();
623 TRACE("fsetstat id %d handle %d", id, handle);
624 fd = handle_to_fd(handle);
625 name = handle_to_name(handle);
626 if (fd < 0 || name == NULL) {
627 status = SSH2_FX_FAILURE;
628 } else {
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);
670 TRACE("opendir id %d path %s", id, path);
671 dirp = opendir(path);
672 if (dirp == NULL) {
673 status = errno_to_portable(errno);
674 } else {
675 handle = handle_new(HANDLE_DIR, xstrdup(path), 0, dirp);
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
689/*
690 * drwxr-xr-x 5 markus markus 1024 Jan 13 18:39 .ssh
691 */
692static char *
693ls_file(char *name, struct stat *st)
694{
695 int ulen, glen, sz = 0;
696 struct passwd *pw;
697 struct group *gr;
698 struct tm *ltime = localtime(&st->st_mtime);
699 char *user, *group;
700 char buf[1024], mode[11+1], tbuf[12+1], ubuf[11+1], gbuf[11+1];
701
702 strmode(st->st_mode, mode);
703 if ((pw = getpwuid(st->st_uid)) != NULL) {
704 user = pw->pw_name;
705 } else {
706 snprintf(ubuf, sizeof ubuf, "%d", st->st_uid);
707 user = ubuf;
708 }
709 if ((gr = getgrgid(st->st_gid)) != NULL) {
710 group = gr->gr_name;
711 } else {
712 snprintf(gbuf, sizeof gbuf, "%d", st->st_gid);
713 group = gbuf;
714 }
715 if (ltime != NULL) {
716 if (time(NULL) - st->st_mtime < (365*24*60*60)/2)
717 sz = strftime(tbuf, sizeof tbuf, "%b %e %H:%M", ltime);
718 else
719 sz = strftime(tbuf, sizeof tbuf, "%b %e %Y", ltime);
720 }
721 if (sz == 0)
722 tbuf[0] = '\0';
723 ulen = MAX(strlen(user), 8);
724 glen = MAX(strlen(group), 8);
725 snprintf(buf, sizeof buf, "%s %3d %-*s %-*s %8llu %s %s", mode,
726 st->st_nlink, ulen, user, glen, group,
727 (u_int64_t)st->st_size, tbuf, name);
728 return xstrdup(buf);
729}
730
731static void
732process_readdir(void)
733{
734 DIR *dirp;
735 struct dirent *dp;
736 char *path;
737 int handle;
738 u_int32_t id;
739
740 id = get_int();
741 handle = get_handle();
742 TRACE("readdir id %d handle %d", id, handle);
743 dirp = handle_to_dir(handle);
744 path = handle_to_name(handle);
745 if (dirp == NULL || path == NULL) {
746 send_status(id, SSH2_FX_FAILURE);
747 } else {
748 struct stat st;
749 char pathname[1024];
750 Stat *stats;
751 int nstats = 10, count = 0, i;
752 stats = xmalloc(nstats * sizeof(Stat));
753 while ((dp = readdir(dirp)) != NULL) {
754 if (count >= nstats) {
755 nstats *= 2;
756 stats = xrealloc(stats, nstats * sizeof(Stat));
757 }
758/* XXX OVERFLOW ? */
759 snprintf(pathname, sizeof pathname, "%s%s%s", path,
760 strcmp(path, "/") ? "/" : "", dp->d_name);
761 if (lstat(pathname, &st) < 0)
762 continue;
763 stat_to_attrib(&st, &(stats[count].attrib));
764 stats[count].name = xstrdup(dp->d_name);
765 stats[count].long_name = ls_file(dp->d_name, &st);
766 count++;
767 /* send up to 100 entries in one message */
768 /* XXX check packet size instead */
769 if (count == 100)
770 break;
771 }
772 if (count > 0) {
773 send_names(id, count, stats);
774 for(i = 0; i < count; i++) {
775 xfree(stats[i].name);
776 xfree(stats[i].long_name);
777 }
778 } else {
779 send_status(id, SSH2_FX_EOF);
780 }
781 xfree(stats);
782 }
783}
784
785static void
786process_remove(void)
787{
788 char *name;
789 u_int32_t id;
790 int status = SSH2_FX_FAILURE;
791 int ret;
792
793 id = get_int();
794 name = get_string(NULL);
795 TRACE("remove id %d name %s", id, name);
796 ret = unlink(name);
797 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
798 send_status(id, status);
799 xfree(name);
800}
801
802static void
803process_mkdir(void)
804{
805 Attrib *a;
806 u_int32_t id;
807 char *name;
808 int ret, mode, status = SSH2_FX_FAILURE;
809
810 id = get_int();
811 name = get_string(NULL);
812 a = get_attrib();
813 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
814 a->perm & 0777 : 0777;
815 TRACE("mkdir id %d name %s mode 0%o", id, name, mode);
816 ret = mkdir(name, mode);
817 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
818 send_status(id, status);
819 xfree(name);
820}
821
822static void
823process_rmdir(void)
824{
825 u_int32_t id;
826 char *name;
827 int ret, status;
828
829 id = get_int();
830 name = get_string(NULL);
831 TRACE("rmdir id %d name %s", id, name);
832 ret = rmdir(name);
833 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
834 send_status(id, status);
835 xfree(name);
836}
837
838static void
839process_realpath(void)
840{
841 char resolvedname[MAXPATHLEN];
842 u_int32_t id;
843 char *path;
844
845 id = get_int();
846 path = get_string(NULL);
847 if (path[0] == '\0') {
848 xfree(path);
849 path = xstrdup(".");
850 }
851 TRACE("realpath id %d path %s", id, path);
852 if (realpath(path, resolvedname) == NULL) {
853 send_status(id, errno_to_portable(errno));
854 } else {
855 Stat s;
856 attrib_clear(&s.attrib);
857 s.name = s.long_name = resolvedname;
858 send_names(id, 1, &s);
859 }
860 xfree(path);
861}
862
863static void
864process_rename(void)
865{
866 u_int32_t id;
867 struct stat st;
868 char *oldpath, *newpath;
869 int ret, status = SSH2_FX_FAILURE;
870
871 id = get_int();
872 oldpath = get_string(NULL);
873 newpath = get_string(NULL);
874 TRACE("rename id %d old %s new %s", id, oldpath, newpath);
875 /* fail if 'newpath' exists */
876 if (stat(newpath, &st) == -1) {
877 ret = rename(oldpath, newpath);
878 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
879 }
880 send_status(id, status);
881 xfree(oldpath);
882 xfree(newpath);
883}
884
885static void
886process_readlink(void)
887{
888 u_int32_t id;
889 int len;
890 char link[MAXPATHLEN];
891 char *path;
892
893 id = get_int();
894 path = get_string(NULL);
895 TRACE("readlink id %d path %s", id, path);
896 if ((len = readlink(path, link, sizeof(link) - 1)) == -1)
897 send_status(id, errno_to_portable(errno));
898 else {
899 Stat s;
900
901 link[len] = '\0';
902 attrib_clear(&s.attrib);
903 s.name = s.long_name = link;
904 send_names(id, 1, &s);
905 }
906 xfree(path);
907}
908
909static void
910process_symlink(void)
911{
912 u_int32_t id;
913 struct stat st;
914 char *oldpath, *newpath;
915 int ret, status = SSH2_FX_FAILURE;
916
917 id = get_int();
918 oldpath = get_string(NULL);
919 newpath = get_string(NULL);
920 TRACE("symlink id %d old %s new %s", id, oldpath, newpath);
921 /* fail if 'newpath' exists */
922 if (stat(newpath, &st) == -1) {
923 ret = symlink(oldpath, newpath);
924 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
925 }
926 send_status(id, status);
927 xfree(oldpath);
928 xfree(newpath);
929}
930
931static void
932process_extended(void)
933{
934 u_int32_t id;
935 char *request;
936
937 id = get_int();
938 request = get_string(NULL);
939 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
940 xfree(request);
941}
942
943/* stolen from ssh-agent */
944
945static void
946process(void)
947{
948 u_int msg_len;
949 u_int type;
950 u_char *cp;
951
952 if (buffer_len(&iqueue) < 5)
953 return; /* Incomplete message. */
954 cp = (u_char *) buffer_ptr(&iqueue);
955 msg_len = GET_32BIT(cp);
956 if (msg_len > 256 * 1024) {
957 error("bad message ");
958 exit(11);
959 }
960 if (buffer_len(&iqueue) < msg_len + 4)
961 return;
962 buffer_consume(&iqueue, 4);
963 type = buffer_get_char(&iqueue);
964 switch (type) {
965 case SSH2_FXP_INIT:
966 process_init();
967 break;
968 case SSH2_FXP_OPEN:
969 process_open();
970 break;
971 case SSH2_FXP_CLOSE:
972 process_close();
973 break;
974 case SSH2_FXP_READ:
975 process_read();
976 break;
977 case SSH2_FXP_WRITE:
978 process_write();
979 break;
980 case SSH2_FXP_LSTAT:
981 process_lstat();
982 break;
983 case SSH2_FXP_FSTAT:
984 process_fstat();
985 break;
986 case SSH2_FXP_SETSTAT:
987 process_setstat();
988 break;
989 case SSH2_FXP_FSETSTAT:
990 process_fsetstat();
991 break;
992 case SSH2_FXP_OPENDIR:
993 process_opendir();
994 break;
995 case SSH2_FXP_READDIR:
996 process_readdir();
997 break;
998 case SSH2_FXP_REMOVE:
999 process_remove();
1000 break;
1001 case SSH2_FXP_MKDIR:
1002 process_mkdir();
1003 break;
1004 case SSH2_FXP_RMDIR:
1005 process_rmdir();
1006 break;
1007 case SSH2_FXP_REALPATH:
1008 process_realpath();
1009 break;
1010 case SSH2_FXP_STAT:
1011 process_stat();
1012 break;
1013 case SSH2_FXP_RENAME:
1014 process_rename();
1015 break;
1016 case SSH2_FXP_READLINK:
1017 process_readlink();
1018 break;
1019 case SSH2_FXP_SYMLINK:
1020 process_symlink();
1021 break;
1022 case SSH2_FXP_EXTENDED:
1023 process_extended();
1024 break;
1025 default:
1026 error("Unknown message %d", type);
1027 break;
1028 }
1029}
1030
1031int
1032main(int ac, char **av)
1033{
1034 fd_set *rset, *wset;
1035 int in, out, max;
1036 ssize_t len, olen, set_size;
1037
1038 /* XXX should use getopt */
1039
1040 __progname = get_progname(av[0]);
1041 handle_init();
1042
1043#ifdef DEBUG_SFTP_SERVER
1044 log_init("sftp-server", SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 0);
1045#endif
1046
1047 in = dup(STDIN_FILENO);
1048 out = dup(STDOUT_FILENO);
1049
1050#ifdef HAVE_CYGWIN
1051 setmode(in, O_BINARY);
1052 setmode(out, O_BINARY);
1053#endif
1054
1055 max = 0;
1056 if (in > max)
1057 max = in;
1058 if (out > max)
1059 max = out;
1060
1061 buffer_init(&iqueue);
1062 buffer_init(&oqueue);
1063
1064 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1065 rset = (fd_set *)xmalloc(set_size);
1066 wset = (fd_set *)xmalloc(set_size);
1067
1068 for (;;) {
1069 memset(rset, 0, set_size);
1070 memset(wset, 0, set_size);
1071
1072 FD_SET(in, rset);
1073 olen = buffer_len(&oqueue);
1074 if (olen > 0)
1075 FD_SET(out, wset);
1076
1077 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1078 if (errno == EINTR)
1079 continue;
1080 exit(2);
1081 }
1082
1083 /* copy stdin to iqueue */
1084 if (FD_ISSET(in, rset)) {
1085 char buf[4*4096];
1086 len = read(in, buf, sizeof buf);
1087 if (len == 0) {
1088 debug("read eof");
1089 exit(0);
1090 } else if (len < 0) {
1091 error("read error");
1092 exit(1);
1093 } else {
1094 buffer_append(&iqueue, buf, len);
1095 }
1096 }
1097 /* send oqueue to stdout */
1098 if (FD_ISSET(out, wset)) {
1099 len = write(out, buffer_ptr(&oqueue), olen);
1100 if (len < 0) {
1101 error("write error");
1102 exit(1);
1103 } else {
1104 buffer_consume(&oqueue, len);
1105 }
1106 }
1107 /* process requests from client */
1108 process();
1109 }
1110}
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