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1 | /* $OpenBSD: sftp-server.c,v 1.73 2007/05/17 07:55:29 djm Exp $ */ | |
2 | /* | |
3 | * Copyright (c) 2000-2004 Markus Friedl. All rights reserved. | |
4 | * | |
5 | * Permission to use, copy, modify, and distribute this software for any | |
6 | * purpose with or without fee is hereby granted, provided that the above | |
7 | * copyright notice and this permission notice appear in all copies. | |
8 | * | |
9 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
10 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
11 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
12 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
13 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
14 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
15 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
16 | */ | |
17 | ||
18 | #include "includes.h" | |
19 | ||
20 | #include <sys/types.h> | |
21 | #include <sys/param.h> | |
22 | #include <sys/stat.h> | |
23 | #ifdef HAVE_SYS_TIME_H | |
24 | # include <sys/time.h> | |
25 | #endif | |
26 | ||
27 | #include <dirent.h> | |
28 | #include <errno.h> | |
29 | #include <fcntl.h> | |
30 | #include <pwd.h> | |
31 | #include <stdlib.h> | |
32 | #include <stdio.h> | |
33 | #include <string.h> | |
34 | #include <pwd.h> | |
35 | #include <time.h> | |
36 | #include <unistd.h> | |
37 | #include <stdarg.h> | |
38 | ||
39 | #include "xmalloc.h" | |
40 | #include "buffer.h" | |
41 | #include "log.h" | |
42 | #include "misc.h" | |
43 | #include "uidswap.h" | |
44 | ||
45 | #include "sftp.h" | |
46 | #include "sftp-common.h" | |
47 | ||
48 | /* helper */ | |
49 | #define get_int64() buffer_get_int64(&iqueue); | |
50 | #define get_int() buffer_get_int(&iqueue); | |
51 | #define get_string(lenp) buffer_get_string(&iqueue, lenp); | |
52 | ||
53 | /* Our verbosity */ | |
54 | LogLevel log_level = SYSLOG_LEVEL_ERROR; | |
55 | ||
56 | /* Our client */ | |
57 | struct passwd *pw = NULL; | |
58 | char *client_addr = NULL; | |
59 | ||
60 | /* input and output queue */ | |
61 | Buffer iqueue; | |
62 | Buffer oqueue; | |
63 | ||
64 | /* Version of client */ | |
65 | int version; | |
66 | ||
67 | /* portable attributes, etc. */ | |
68 | ||
69 | typedef struct Stat Stat; | |
70 | ||
71 | struct Stat { | |
72 | char *name; | |
73 | char *long_name; | |
74 | Attrib attrib; | |
75 | }; | |
76 | ||
77 | static int | |
78 | errno_to_portable(int unixerrno) | |
79 | { | |
80 | int ret = 0; | |
81 | ||
82 | switch (unixerrno) { | |
83 | case 0: | |
84 | ret = SSH2_FX_OK; | |
85 | break; | |
86 | case ENOENT: | |
87 | case ENOTDIR: | |
88 | case EBADF: | |
89 | case ELOOP: | |
90 | ret = SSH2_FX_NO_SUCH_FILE; | |
91 | break; | |
92 | case EPERM: | |
93 | case EACCES: | |
94 | case EFAULT: | |
95 | ret = SSH2_FX_PERMISSION_DENIED; | |
96 | break; | |
97 | case ENAMETOOLONG: | |
98 | case EINVAL: | |
99 | ret = SSH2_FX_BAD_MESSAGE; | |
100 | break; | |
101 | default: | |
102 | ret = SSH2_FX_FAILURE; | |
103 | break; | |
104 | } | |
105 | return ret; | |
106 | } | |
107 | ||
108 | static int | |
109 | flags_from_portable(int pflags) | |
110 | { | |
111 | int flags = 0; | |
112 | ||
113 | if ((pflags & SSH2_FXF_READ) && | |
114 | (pflags & SSH2_FXF_WRITE)) { | |
115 | flags = O_RDWR; | |
116 | } else if (pflags & SSH2_FXF_READ) { | |
117 | flags = O_RDONLY; | |
118 | } else if (pflags & SSH2_FXF_WRITE) { | |
119 | flags = O_WRONLY; | |
120 | } | |
121 | if (pflags & SSH2_FXF_CREAT) | |
122 | flags |= O_CREAT; | |
123 | if (pflags & SSH2_FXF_TRUNC) | |
124 | flags |= O_TRUNC; | |
125 | if (pflags & SSH2_FXF_EXCL) | |
126 | flags |= O_EXCL; | |
127 | return flags; | |
128 | } | |
129 | ||
130 | static const char * | |
131 | string_from_portable(int pflags) | |
132 | { | |
133 | static char ret[128]; | |
134 | ||
135 | *ret = '\0'; | |
136 | ||
137 | #define PAPPEND(str) { \ | |
138 | if (*ret != '\0') \ | |
139 | strlcat(ret, ",", sizeof(ret)); \ | |
140 | strlcat(ret, str, sizeof(ret)); \ | |
141 | } | |
142 | ||
143 | if (pflags & SSH2_FXF_READ) | |
144 | PAPPEND("READ") | |
145 | if (pflags & SSH2_FXF_WRITE) | |
146 | PAPPEND("WRITE") | |
147 | if (pflags & SSH2_FXF_CREAT) | |
148 | PAPPEND("CREATE") | |
149 | if (pflags & SSH2_FXF_TRUNC) | |
150 | PAPPEND("TRUNCATE") | |
151 | if (pflags & SSH2_FXF_EXCL) | |
152 | PAPPEND("EXCL") | |
153 | ||
154 | return ret; | |
155 | } | |
156 | ||
157 | static Attrib * | |
158 | get_attrib(void) | |
159 | { | |
160 | return decode_attrib(&iqueue); | |
161 | } | |
162 | ||
163 | /* handle handles */ | |
164 | ||
165 | typedef struct Handle Handle; | |
166 | struct Handle { | |
167 | int use; | |
168 | DIR *dirp; | |
169 | int fd; | |
170 | char *name; | |
171 | u_int64_t bytes_read, bytes_write; | |
172 | }; | |
173 | ||
174 | enum { | |
175 | HANDLE_UNUSED, | |
176 | HANDLE_DIR, | |
177 | HANDLE_FILE | |
178 | }; | |
179 | ||
180 | Handle handles[100]; | |
181 | ||
182 | static void | |
183 | handle_init(void) | |
184 | { | |
185 | u_int i; | |
186 | ||
187 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) | |
188 | handles[i].use = HANDLE_UNUSED; | |
189 | } | |
190 | ||
191 | static int | |
192 | handle_new(int use, const char *name, int fd, DIR *dirp) | |
193 | { | |
194 | u_int i; | |
195 | ||
196 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) { | |
197 | if (handles[i].use == HANDLE_UNUSED) { | |
198 | handles[i].use = use; | |
199 | handles[i].dirp = dirp; | |
200 | handles[i].fd = fd; | |
201 | handles[i].name = xstrdup(name); | |
202 | handles[i].bytes_read = handles[i].bytes_write = 0; | |
203 | return i; | |
204 | } | |
205 | } | |
206 | return -1; | |
207 | } | |
208 | ||
209 | static int | |
210 | handle_is_ok(int i, int type) | |
211 | { | |
212 | return i >= 0 && (u_int)i < sizeof(handles)/sizeof(Handle) && | |
213 | handles[i].use == type; | |
214 | } | |
215 | ||
216 | static int | |
217 | handle_to_string(int handle, char **stringp, int *hlenp) | |
218 | { | |
219 | if (stringp == NULL || hlenp == NULL) | |
220 | return -1; | |
221 | *stringp = xmalloc(sizeof(int32_t)); | |
222 | put_u32(*stringp, handle); | |
223 | *hlenp = sizeof(int32_t); | |
224 | return 0; | |
225 | } | |
226 | ||
227 | static int | |
228 | handle_from_string(const char *handle, u_int hlen) | |
229 | { | |
230 | int val; | |
231 | ||
232 | if (hlen != sizeof(int32_t)) | |
233 | return -1; | |
234 | val = get_u32(handle); | |
235 | if (handle_is_ok(val, HANDLE_FILE) || | |
236 | handle_is_ok(val, HANDLE_DIR)) | |
237 | return val; | |
238 | return -1; | |
239 | } | |
240 | ||
241 | static char * | |
242 | handle_to_name(int handle) | |
243 | { | |
244 | if (handle_is_ok(handle, HANDLE_DIR)|| | |
245 | handle_is_ok(handle, HANDLE_FILE)) | |
246 | return handles[handle].name; | |
247 | return NULL; | |
248 | } | |
249 | ||
250 | static DIR * | |
251 | handle_to_dir(int handle) | |
252 | { | |
253 | if (handle_is_ok(handle, HANDLE_DIR)) | |
254 | return handles[handle].dirp; | |
255 | return NULL; | |
256 | } | |
257 | ||
258 | static int | |
259 | handle_to_fd(int handle) | |
260 | { | |
261 | if (handle_is_ok(handle, HANDLE_FILE)) | |
262 | return handles[handle].fd; | |
263 | return -1; | |
264 | } | |
265 | ||
266 | static void | |
267 | handle_update_read(int handle, ssize_t bytes) | |
268 | { | |
269 | if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0) | |
270 | handles[handle].bytes_read += bytes; | |
271 | } | |
272 | ||
273 | static void | |
274 | handle_update_write(int handle, ssize_t bytes) | |
275 | { | |
276 | if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0) | |
277 | handles[handle].bytes_write += bytes; | |
278 | } | |
279 | ||
280 | static u_int64_t | |
281 | handle_bytes_read(int handle) | |
282 | { | |
283 | if (handle_is_ok(handle, HANDLE_FILE)) | |
284 | return (handles[handle].bytes_read); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static u_int64_t | |
289 | handle_bytes_write(int handle) | |
290 | { | |
291 | if (handle_is_ok(handle, HANDLE_FILE)) | |
292 | return (handles[handle].bytes_write); | |
293 | return 0; | |
294 | } | |
295 | ||
296 | static int | |
297 | handle_close(int handle) | |
298 | { | |
299 | int ret = -1; | |
300 | ||
301 | if (handle_is_ok(handle, HANDLE_FILE)) { | |
302 | ret = close(handles[handle].fd); | |
303 | handles[handle].use = HANDLE_UNUSED; | |
304 | xfree(handles[handle].name); | |
305 | } else if (handle_is_ok(handle, HANDLE_DIR)) { | |
306 | ret = closedir(handles[handle].dirp); | |
307 | handles[handle].use = HANDLE_UNUSED; | |
308 | xfree(handles[handle].name); | |
309 | } else { | |
310 | errno = ENOENT; | |
311 | } | |
312 | return ret; | |
313 | } | |
314 | ||
315 | static void | |
316 | handle_log_close(int handle, char *emsg) | |
317 | { | |
318 | if (handle_is_ok(handle, HANDLE_FILE)) { | |
319 | logit("%s%sclose \"%s\" bytes read %llu written %llu", | |
320 | emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ", | |
321 | handle_to_name(handle), | |
322 | (unsigned long long)handle_bytes_read(handle), | |
323 | (unsigned long long)handle_bytes_write(handle)); | |
324 | } else { | |
325 | logit("%s%sclosedir \"%s\"", | |
326 | emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ", | |
327 | handle_to_name(handle)); | |
328 | } | |
329 | } | |
330 | ||
331 | static void | |
332 | handle_log_exit(void) | |
333 | { | |
334 | u_int i; | |
335 | ||
336 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) | |
337 | if (handles[i].use != HANDLE_UNUSED) | |
338 | handle_log_close(i, "forced"); | |
339 | } | |
340 | ||
341 | static int | |
342 | get_handle(void) | |
343 | { | |
344 | char *handle; | |
345 | int val = -1; | |
346 | u_int hlen; | |
347 | ||
348 | handle = get_string(&hlen); | |
349 | if (hlen < 256) | |
350 | val = handle_from_string(handle, hlen); | |
351 | xfree(handle); | |
352 | return val; | |
353 | } | |
354 | ||
355 | /* send replies */ | |
356 | ||
357 | static void | |
358 | send_msg(Buffer *m) | |
359 | { | |
360 | int mlen = buffer_len(m); | |
361 | ||
362 | buffer_put_int(&oqueue, mlen); | |
363 | buffer_append(&oqueue, buffer_ptr(m), mlen); | |
364 | buffer_consume(m, mlen); | |
365 | } | |
366 | ||
367 | static const char * | |
368 | status_to_message(u_int32_t status) | |
369 | { | |
370 | const char *status_messages[] = { | |
371 | "Success", /* SSH_FX_OK */ | |
372 | "End of file", /* SSH_FX_EOF */ | |
373 | "No such file", /* SSH_FX_NO_SUCH_FILE */ | |
374 | "Permission denied", /* SSH_FX_PERMISSION_DENIED */ | |
375 | "Failure", /* SSH_FX_FAILURE */ | |
376 | "Bad message", /* SSH_FX_BAD_MESSAGE */ | |
377 | "No connection", /* SSH_FX_NO_CONNECTION */ | |
378 | "Connection lost", /* SSH_FX_CONNECTION_LOST */ | |
379 | "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */ | |
380 | "Unknown error" /* Others */ | |
381 | }; | |
382 | return (status_messages[MIN(status,SSH2_FX_MAX)]); | |
383 | } | |
384 | ||
385 | static void | |
386 | send_status(u_int32_t id, u_int32_t status) | |
387 | { | |
388 | Buffer msg; | |
389 | ||
390 | debug3("request %u: sent status %u", id, status); | |
391 | if (log_level > SYSLOG_LEVEL_VERBOSE || | |
392 | (status != SSH2_FX_OK && status != SSH2_FX_EOF)) | |
393 | logit("sent status %s", status_to_message(status)); | |
394 | buffer_init(&msg); | |
395 | buffer_put_char(&msg, SSH2_FXP_STATUS); | |
396 | buffer_put_int(&msg, id); | |
397 | buffer_put_int(&msg, status); | |
398 | if (version >= 3) { | |
399 | buffer_put_cstring(&msg, status_to_message(status)); | |
400 | buffer_put_cstring(&msg, ""); | |
401 | } | |
402 | send_msg(&msg); | |
403 | buffer_free(&msg); | |
404 | } | |
405 | static void | |
406 | send_data_or_handle(char type, u_int32_t id, const char *data, int dlen) | |
407 | { | |
408 | Buffer msg; | |
409 | ||
410 | buffer_init(&msg); | |
411 | buffer_put_char(&msg, type); | |
412 | buffer_put_int(&msg, id); | |
413 | buffer_put_string(&msg, data, dlen); | |
414 | send_msg(&msg); | |
415 | buffer_free(&msg); | |
416 | } | |
417 | ||
418 | static void | |
419 | send_data(u_int32_t id, const char *data, int dlen) | |
420 | { | |
421 | debug("request %u: sent data len %d", id, dlen); | |
422 | send_data_or_handle(SSH2_FXP_DATA, id, data, dlen); | |
423 | } | |
424 | ||
425 | static void | |
426 | send_handle(u_int32_t id, int handle) | |
427 | { | |
428 | char *string; | |
429 | int hlen; | |
430 | ||
431 | handle_to_string(handle, &string, &hlen); | |
432 | debug("request %u: sent handle handle %d", id, handle); | |
433 | send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen); | |
434 | xfree(string); | |
435 | } | |
436 | ||
437 | static void | |
438 | send_names(u_int32_t id, int count, const Stat *stats) | |
439 | { | |
440 | Buffer msg; | |
441 | int i; | |
442 | ||
443 | buffer_init(&msg); | |
444 | buffer_put_char(&msg, SSH2_FXP_NAME); | |
445 | buffer_put_int(&msg, id); | |
446 | buffer_put_int(&msg, count); | |
447 | debug("request %u: sent names count %d", id, count); | |
448 | for (i = 0; i < count; i++) { | |
449 | buffer_put_cstring(&msg, stats[i].name); | |
450 | buffer_put_cstring(&msg, stats[i].long_name); | |
451 | encode_attrib(&msg, &stats[i].attrib); | |
452 | } | |
453 | send_msg(&msg); | |
454 | buffer_free(&msg); | |
455 | } | |
456 | ||
457 | static void | |
458 | send_attrib(u_int32_t id, const Attrib *a) | |
459 | { | |
460 | Buffer msg; | |
461 | ||
462 | debug("request %u: sent attrib have 0x%x", id, a->flags); | |
463 | buffer_init(&msg); | |
464 | buffer_put_char(&msg, SSH2_FXP_ATTRS); | |
465 | buffer_put_int(&msg, id); | |
466 | encode_attrib(&msg, a); | |
467 | send_msg(&msg); | |
468 | buffer_free(&msg); | |
469 | } | |
470 | ||
471 | /* parse incoming */ | |
472 | ||
473 | static void | |
474 | process_init(void) | |
475 | { | |
476 | Buffer msg; | |
477 | ||
478 | version = get_int(); | |
479 | verbose("received client version %d", version); | |
480 | buffer_init(&msg); | |
481 | buffer_put_char(&msg, SSH2_FXP_VERSION); | |
482 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
483 | send_msg(&msg); | |
484 | buffer_free(&msg); | |
485 | } | |
486 | ||
487 | static void | |
488 | process_open(void) | |
489 | { | |
490 | u_int32_t id, pflags; | |
491 | Attrib *a; | |
492 | char *name; | |
493 | int handle, fd, flags, mode, status = SSH2_FX_FAILURE; | |
494 | ||
495 | id = get_int(); | |
496 | name = get_string(NULL); | |
497 | pflags = get_int(); /* portable flags */ | |
498 | debug3("request %u: open flags %d", id, pflags); | |
499 | a = get_attrib(); | |
500 | flags = flags_from_portable(pflags); | |
501 | mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666; | |
502 | logit("open \"%s\" flags %s mode 0%o", | |
503 | name, string_from_portable(pflags), mode); | |
504 | fd = open(name, flags, mode); | |
505 | if (fd < 0) { | |
506 | status = errno_to_portable(errno); | |
507 | } else { | |
508 | handle = handle_new(HANDLE_FILE, name, fd, NULL); | |
509 | if (handle < 0) { | |
510 | close(fd); | |
511 | } else { | |
512 | send_handle(id, handle); | |
513 | status = SSH2_FX_OK; | |
514 | } | |
515 | } | |
516 | if (status != SSH2_FX_OK) | |
517 | send_status(id, status); | |
518 | xfree(name); | |
519 | } | |
520 | ||
521 | static void | |
522 | process_close(void) | |
523 | { | |
524 | u_int32_t id; | |
525 | int handle, ret, status = SSH2_FX_FAILURE; | |
526 | ||
527 | id = get_int(); | |
528 | handle = get_handle(); | |
529 | debug3("request %u: close handle %u", id, handle); | |
530 | handle_log_close(handle, NULL); | |
531 | ret = handle_close(handle); | |
532 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
533 | send_status(id, status); | |
534 | } | |
535 | ||
536 | static void | |
537 | process_read(void) | |
538 | { | |
539 | char buf[64*1024]; | |
540 | u_int32_t id, len; | |
541 | int handle, fd, ret, status = SSH2_FX_FAILURE; | |
542 | u_int64_t off; | |
543 | ||
544 | id = get_int(); | |
545 | handle = get_handle(); | |
546 | off = get_int64(); | |
547 | len = get_int(); | |
548 | ||
549 | debug("request %u: read \"%s\" (handle %d) off %llu len %d", | |
550 | id, handle_to_name(handle), handle, (unsigned long long)off, len); | |
551 | if (len > sizeof buf) { | |
552 | len = sizeof buf; | |
553 | debug2("read change len %d", len); | |
554 | } | |
555 | fd = handle_to_fd(handle); | |
556 | if (fd >= 0) { | |
557 | if (lseek(fd, off, SEEK_SET) < 0) { | |
558 | error("process_read: seek failed"); | |
559 | status = errno_to_portable(errno); | |
560 | } else { | |
561 | ret = read(fd, buf, len); | |
562 | if (ret < 0) { | |
563 | status = errno_to_portable(errno); | |
564 | } else if (ret == 0) { | |
565 | status = SSH2_FX_EOF; | |
566 | } else { | |
567 | send_data(id, buf, ret); | |
568 | status = SSH2_FX_OK; | |
569 | handle_update_read(handle, ret); | |
570 | } | |
571 | } | |
572 | } | |
573 | if (status != SSH2_FX_OK) | |
574 | send_status(id, status); | |
575 | } | |
576 | ||
577 | static void | |
578 | process_write(void) | |
579 | { | |
580 | u_int32_t id; | |
581 | u_int64_t off; | |
582 | u_int len; | |
583 | int handle, fd, ret, status = SSH2_FX_FAILURE; | |
584 | char *data; | |
585 | ||
586 | id = get_int(); | |
587 | handle = get_handle(); | |
588 | off = get_int64(); | |
589 | data = get_string(&len); | |
590 | ||
591 | debug("request %u: write \"%s\" (handle %d) off %llu len %d", | |
592 | id, handle_to_name(handle), handle, (unsigned long long)off, len); | |
593 | fd = handle_to_fd(handle); | |
594 | if (fd >= 0) { | |
595 | if (lseek(fd, off, SEEK_SET) < 0) { | |
596 | status = errno_to_portable(errno); | |
597 | error("process_write: seek failed"); | |
598 | } else { | |
599 | /* XXX ATOMICIO ? */ | |
600 | ret = write(fd, data, len); | |
601 | if (ret < 0) { | |
602 | error("process_write: write failed"); | |
603 | status = errno_to_portable(errno); | |
604 | } else if ((size_t)ret == len) { | |
605 | status = SSH2_FX_OK; | |
606 | handle_update_write(handle, ret); | |
607 | } else { | |
608 | debug2("nothing at all written"); | |
609 | } | |
610 | } | |
611 | } | |
612 | send_status(id, status); | |
613 | xfree(data); | |
614 | } | |
615 | ||
616 | static void | |
617 | process_do_stat(int do_lstat) | |
618 | { | |
619 | Attrib a; | |
620 | struct stat st; | |
621 | u_int32_t id; | |
622 | char *name; | |
623 | int ret, status = SSH2_FX_FAILURE; | |
624 | ||
625 | id = get_int(); | |
626 | name = get_string(NULL); | |
627 | debug3("request %u: %sstat", id, do_lstat ? "l" : ""); | |
628 | verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name); | |
629 | ret = do_lstat ? lstat(name, &st) : stat(name, &st); | |
630 | if (ret < 0) { | |
631 | status = errno_to_portable(errno); | |
632 | } else { | |
633 | stat_to_attrib(&st, &a); | |
634 | send_attrib(id, &a); | |
635 | status = SSH2_FX_OK; | |
636 | } | |
637 | if (status != SSH2_FX_OK) | |
638 | send_status(id, status); | |
639 | xfree(name); | |
640 | } | |
641 | ||
642 | static void | |
643 | process_stat(void) | |
644 | { | |
645 | process_do_stat(0); | |
646 | } | |
647 | ||
648 | static void | |
649 | process_lstat(void) | |
650 | { | |
651 | process_do_stat(1); | |
652 | } | |
653 | ||
654 | static void | |
655 | process_fstat(void) | |
656 | { | |
657 | Attrib a; | |
658 | struct stat st; | |
659 | u_int32_t id; | |
660 | int fd, ret, handle, status = SSH2_FX_FAILURE; | |
661 | ||
662 | id = get_int(); | |
663 | handle = get_handle(); | |
664 | debug("request %u: fstat \"%s\" (handle %u)", | |
665 | id, handle_to_name(handle), handle); | |
666 | fd = handle_to_fd(handle); | |
667 | if (fd >= 0) { | |
668 | ret = fstat(fd, &st); | |
669 | if (ret < 0) { | |
670 | status = errno_to_portable(errno); | |
671 | } else { | |
672 | stat_to_attrib(&st, &a); | |
673 | send_attrib(id, &a); | |
674 | status = SSH2_FX_OK; | |
675 | } | |
676 | } | |
677 | if (status != SSH2_FX_OK) | |
678 | send_status(id, status); | |
679 | } | |
680 | ||
681 | static struct timeval * | |
682 | attrib_to_tv(const Attrib *a) | |
683 | { | |
684 | static struct timeval tv[2]; | |
685 | ||
686 | tv[0].tv_sec = a->atime; | |
687 | tv[0].tv_usec = 0; | |
688 | tv[1].tv_sec = a->mtime; | |
689 | tv[1].tv_usec = 0; | |
690 | return tv; | |
691 | } | |
692 | ||
693 | static void | |
694 | process_setstat(void) | |
695 | { | |
696 | Attrib *a; | |
697 | u_int32_t id; | |
698 | char *name; | |
699 | int status = SSH2_FX_OK, ret; | |
700 | ||
701 | id = get_int(); | |
702 | name = get_string(NULL); | |
703 | a = get_attrib(); | |
704 | debug("request %u: setstat name \"%s\"", id, name); | |
705 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { | |
706 | logit("set \"%s\" size %llu", | |
707 | name, (unsigned long long)a->size); | |
708 | ret = truncate(name, a->size); | |
709 | if (ret == -1) | |
710 | status = errno_to_portable(errno); | |
711 | } | |
712 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { | |
713 | logit("set \"%s\" mode %04o", name, a->perm); | |
714 | ret = chmod(name, a->perm & 0777); | |
715 | if (ret == -1) | |
716 | status = errno_to_portable(errno); | |
717 | } | |
718 | if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { | |
719 | char buf[64]; | |
720 | time_t t = a->mtime; | |
721 | ||
722 | strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S", | |
723 | localtime(&t)); | |
724 | logit("set \"%s\" modtime %s", name, buf); | |
725 | ret = utimes(name, attrib_to_tv(a)); | |
726 | if (ret == -1) | |
727 | status = errno_to_portable(errno); | |
728 | } | |
729 | if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { | |
730 | logit("set \"%s\" owner %lu group %lu", name, | |
731 | (u_long)a->uid, (u_long)a->gid); | |
732 | ret = chown(name, a->uid, a->gid); | |
733 | if (ret == -1) | |
734 | status = errno_to_portable(errno); | |
735 | } | |
736 | send_status(id, status); | |
737 | xfree(name); | |
738 | } | |
739 | ||
740 | static void | |
741 | process_fsetstat(void) | |
742 | { | |
743 | Attrib *a; | |
744 | u_int32_t id; | |
745 | int handle, fd, ret; | |
746 | int status = SSH2_FX_OK; | |
747 | ||
748 | id = get_int(); | |
749 | handle = get_handle(); | |
750 | a = get_attrib(); | |
751 | debug("request %u: fsetstat handle %d", id, handle); | |
752 | fd = handle_to_fd(handle); | |
753 | if (fd < 0) { | |
754 | status = SSH2_FX_FAILURE; | |
755 | } else { | |
756 | char *name = handle_to_name(handle); | |
757 | ||
758 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { | |
759 | logit("set \"%s\" size %llu", | |
760 | name, (unsigned long long)a->size); | |
761 | ret = ftruncate(fd, a->size); | |
762 | if (ret == -1) | |
763 | status = errno_to_portable(errno); | |
764 | } | |
765 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { | |
766 | logit("set \"%s\" mode %04o", name, a->perm); | |
767 | #ifdef HAVE_FCHMOD | |
768 | ret = fchmod(fd, a->perm & 0777); | |
769 | #else | |
770 | ret = chmod(name, a->perm & 0777); | |
771 | #endif | |
772 | if (ret == -1) | |
773 | status = errno_to_portable(errno); | |
774 | } | |
775 | if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { | |
776 | char buf[64]; | |
777 | time_t t = a->mtime; | |
778 | ||
779 | strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S", | |
780 | localtime(&t)); | |
781 | logit("set \"%s\" modtime %s", name, buf); | |
782 | #ifdef HAVE_FUTIMES | |
783 | ret = futimes(fd, attrib_to_tv(a)); | |
784 | #else | |
785 | ret = utimes(name, attrib_to_tv(a)); | |
786 | #endif | |
787 | if (ret == -1) | |
788 | status = errno_to_portable(errno); | |
789 | } | |
790 | if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { | |
791 | logit("set \"%s\" owner %lu group %lu", name, | |
792 | (u_long)a->uid, (u_long)a->gid); | |
793 | #ifdef HAVE_FCHOWN | |
794 | ret = fchown(fd, a->uid, a->gid); | |
795 | #else | |
796 | ret = chown(name, a->uid, a->gid); | |
797 | #endif | |
798 | if (ret == -1) | |
799 | status = errno_to_portable(errno); | |
800 | } | |
801 | } | |
802 | send_status(id, status); | |
803 | } | |
804 | ||
805 | static void | |
806 | process_opendir(void) | |
807 | { | |
808 | DIR *dirp = NULL; | |
809 | char *path; | |
810 | int handle, status = SSH2_FX_FAILURE; | |
811 | u_int32_t id; | |
812 | ||
813 | id = get_int(); | |
814 | path = get_string(NULL); | |
815 | debug3("request %u: opendir", id); | |
816 | logit("opendir \"%s\"", path); | |
817 | dirp = opendir(path); | |
818 | if (dirp == NULL) { | |
819 | status = errno_to_portable(errno); | |
820 | } else { | |
821 | handle = handle_new(HANDLE_DIR, path, 0, dirp); | |
822 | if (handle < 0) { | |
823 | closedir(dirp); | |
824 | } else { | |
825 | send_handle(id, handle); | |
826 | status = SSH2_FX_OK; | |
827 | } | |
828 | ||
829 | } | |
830 | if (status != SSH2_FX_OK) | |
831 | send_status(id, status); | |
832 | xfree(path); | |
833 | } | |
834 | ||
835 | static void | |
836 | process_readdir(void) | |
837 | { | |
838 | DIR *dirp; | |
839 | struct dirent *dp; | |
840 | char *path; | |
841 | int handle; | |
842 | u_int32_t id; | |
843 | ||
844 | id = get_int(); | |
845 | handle = get_handle(); | |
846 | debug("request %u: readdir \"%s\" (handle %d)", id, | |
847 | handle_to_name(handle), handle); | |
848 | dirp = handle_to_dir(handle); | |
849 | path = handle_to_name(handle); | |
850 | if (dirp == NULL || path == NULL) { | |
851 | send_status(id, SSH2_FX_FAILURE); | |
852 | } else { | |
853 | struct stat st; | |
854 | char pathname[MAXPATHLEN]; | |
855 | Stat *stats; | |
856 | int nstats = 10, count = 0, i; | |
857 | ||
858 | stats = xcalloc(nstats, sizeof(Stat)); | |
859 | while ((dp = readdir(dirp)) != NULL) { | |
860 | if (count >= nstats) { | |
861 | nstats *= 2; | |
862 | stats = xrealloc(stats, nstats, sizeof(Stat)); | |
863 | } | |
864 | /* XXX OVERFLOW ? */ | |
865 | snprintf(pathname, sizeof pathname, "%s%s%s", path, | |
866 | strcmp(path, "/") ? "/" : "", dp->d_name); | |
867 | if (lstat(pathname, &st) < 0) | |
868 | continue; | |
869 | stat_to_attrib(&st, &(stats[count].attrib)); | |
870 | stats[count].name = xstrdup(dp->d_name); | |
871 | stats[count].long_name = ls_file(dp->d_name, &st, 0); | |
872 | count++; | |
873 | /* send up to 100 entries in one message */ | |
874 | /* XXX check packet size instead */ | |
875 | if (count == 100) | |
876 | break; | |
877 | } | |
878 | if (count > 0) { | |
879 | send_names(id, count, stats); | |
880 | for (i = 0; i < count; i++) { | |
881 | xfree(stats[i].name); | |
882 | xfree(stats[i].long_name); | |
883 | } | |
884 | } else { | |
885 | send_status(id, SSH2_FX_EOF); | |
886 | } | |
887 | xfree(stats); | |
888 | } | |
889 | } | |
890 | ||
891 | static void | |
892 | process_remove(void) | |
893 | { | |
894 | char *name; | |
895 | u_int32_t id; | |
896 | int status = SSH2_FX_FAILURE; | |
897 | int ret; | |
898 | ||
899 | id = get_int(); | |
900 | name = get_string(NULL); | |
901 | debug3("request %u: remove", id); | |
902 | logit("remove name \"%s\"", name); | |
903 | ret = unlink(name); | |
904 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
905 | send_status(id, status); | |
906 | xfree(name); | |
907 | } | |
908 | ||
909 | static void | |
910 | process_mkdir(void) | |
911 | { | |
912 | Attrib *a; | |
913 | u_int32_t id; | |
914 | char *name; | |
915 | int ret, mode, status = SSH2_FX_FAILURE; | |
916 | ||
917 | id = get_int(); | |
918 | name = get_string(NULL); | |
919 | a = get_attrib(); | |
920 | mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? | |
921 | a->perm & 0777 : 0777; | |
922 | debug3("request %u: mkdir", id); | |
923 | logit("mkdir name \"%s\" mode 0%o", name, mode); | |
924 | ret = mkdir(name, mode); | |
925 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
926 | send_status(id, status); | |
927 | xfree(name); | |
928 | } | |
929 | ||
930 | static void | |
931 | process_rmdir(void) | |
932 | { | |
933 | u_int32_t id; | |
934 | char *name; | |
935 | int ret, status; | |
936 | ||
937 | id = get_int(); | |
938 | name = get_string(NULL); | |
939 | debug3("request %u: rmdir", id); | |
940 | logit("rmdir name \"%s\"", name); | |
941 | ret = rmdir(name); | |
942 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
943 | send_status(id, status); | |
944 | xfree(name); | |
945 | } | |
946 | ||
947 | static void | |
948 | process_realpath(void) | |
949 | { | |
950 | char resolvedname[MAXPATHLEN]; | |
951 | u_int32_t id; | |
952 | char *path; | |
953 | ||
954 | id = get_int(); | |
955 | path = get_string(NULL); | |
956 | if (path[0] == '\0') { | |
957 | xfree(path); | |
958 | path = xstrdup("."); | |
959 | } | |
960 | debug3("request %u: realpath", id); | |
961 | verbose("realpath \"%s\"", path); | |
962 | if (realpath(path, resolvedname) == NULL) { | |
963 | send_status(id, errno_to_portable(errno)); | |
964 | } else { | |
965 | Stat s; | |
966 | attrib_clear(&s.attrib); | |
967 | s.name = s.long_name = resolvedname; | |
968 | send_names(id, 1, &s); | |
969 | } | |
970 | xfree(path); | |
971 | } | |
972 | ||
973 | static void | |
974 | process_rename(void) | |
975 | { | |
976 | u_int32_t id; | |
977 | char *oldpath, *newpath; | |
978 | int status; | |
979 | struct stat sb; | |
980 | ||
981 | id = get_int(); | |
982 | oldpath = get_string(NULL); | |
983 | newpath = get_string(NULL); | |
984 | debug3("request %u: rename", id); | |
985 | logit("rename old \"%s\" new \"%s\"", oldpath, newpath); | |
986 | status = SSH2_FX_FAILURE; | |
987 | if (lstat(oldpath, &sb) == -1) | |
988 | status = errno_to_portable(errno); | |
989 | else if (S_ISREG(sb.st_mode)) { | |
990 | /* Race-free rename of regular files */ | |
991 | if (link(oldpath, newpath) == -1) { | |
992 | if (errno == EOPNOTSUPP | |
993 | #ifdef LINK_OPNOTSUPP_ERRNO | |
994 | || errno == LINK_OPNOTSUPP_ERRNO | |
995 | #endif | |
996 | ) { | |
997 | struct stat st; | |
998 | ||
999 | /* | |
1000 | * fs doesn't support links, so fall back to | |
1001 | * stat+rename. This is racy. | |
1002 | */ | |
1003 | if (stat(newpath, &st) == -1) { | |
1004 | if (rename(oldpath, newpath) == -1) | |
1005 | status = | |
1006 | errno_to_portable(errno); | |
1007 | else | |
1008 | status = SSH2_FX_OK; | |
1009 | } | |
1010 | } else { | |
1011 | status = errno_to_portable(errno); | |
1012 | } | |
1013 | } else if (unlink(oldpath) == -1) { | |
1014 | status = errno_to_portable(errno); | |
1015 | /* clean spare link */ | |
1016 | unlink(newpath); | |
1017 | } else | |
1018 | status = SSH2_FX_OK; | |
1019 | } else if (stat(newpath, &sb) == -1) { | |
1020 | if (rename(oldpath, newpath) == -1) | |
1021 | status = errno_to_portable(errno); | |
1022 | else | |
1023 | status = SSH2_FX_OK; | |
1024 | } | |
1025 | send_status(id, status); | |
1026 | xfree(oldpath); | |
1027 | xfree(newpath); | |
1028 | } | |
1029 | ||
1030 | static void | |
1031 | process_readlink(void) | |
1032 | { | |
1033 | u_int32_t id; | |
1034 | int len; | |
1035 | char buf[MAXPATHLEN]; | |
1036 | char *path; | |
1037 | ||
1038 | id = get_int(); | |
1039 | path = get_string(NULL); | |
1040 | debug3("request %u: readlink", id); | |
1041 | verbose("readlink \"%s\"", path); | |
1042 | if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1) | |
1043 | send_status(id, errno_to_portable(errno)); | |
1044 | else { | |
1045 | Stat s; | |
1046 | ||
1047 | buf[len] = '\0'; | |
1048 | attrib_clear(&s.attrib); | |
1049 | s.name = s.long_name = buf; | |
1050 | send_names(id, 1, &s); | |
1051 | } | |
1052 | xfree(path); | |
1053 | } | |
1054 | ||
1055 | static void | |
1056 | process_symlink(void) | |
1057 | { | |
1058 | u_int32_t id; | |
1059 | char *oldpath, *newpath; | |
1060 | int ret, status; | |
1061 | ||
1062 | id = get_int(); | |
1063 | oldpath = get_string(NULL); | |
1064 | newpath = get_string(NULL); | |
1065 | debug3("request %u: symlink", id); | |
1066 | logit("symlink old \"%s\" new \"%s\"", oldpath, newpath); | |
1067 | /* this will fail if 'newpath' exists */ | |
1068 | ret = symlink(oldpath, newpath); | |
1069 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
1070 | send_status(id, status); | |
1071 | xfree(oldpath); | |
1072 | xfree(newpath); | |
1073 | } | |
1074 | ||
1075 | static void | |
1076 | process_extended(void) | |
1077 | { | |
1078 | u_int32_t id; | |
1079 | char *request; | |
1080 | ||
1081 | id = get_int(); | |
1082 | request = get_string(NULL); | |
1083 | send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */ | |
1084 | xfree(request); | |
1085 | } | |
1086 | ||
1087 | /* stolen from ssh-agent */ | |
1088 | ||
1089 | static void | |
1090 | process(void) | |
1091 | { | |
1092 | u_int msg_len; | |
1093 | u_int buf_len; | |
1094 | u_int consumed; | |
1095 | u_int type; | |
1096 | u_char *cp; | |
1097 | ||
1098 | buf_len = buffer_len(&iqueue); | |
1099 | if (buf_len < 5) | |
1100 | return; /* Incomplete message. */ | |
1101 | cp = buffer_ptr(&iqueue); | |
1102 | msg_len = get_u32(cp); | |
1103 | if (msg_len > SFTP_MAX_MSG_LENGTH) { | |
1104 | error("bad message from %s local user %s", | |
1105 | client_addr, pw->pw_name); | |
1106 | cleanup_exit(11); | |
1107 | } | |
1108 | if (buf_len < msg_len + 4) | |
1109 | return; | |
1110 | buffer_consume(&iqueue, 4); | |
1111 | buf_len -= 4; | |
1112 | type = buffer_get_char(&iqueue); | |
1113 | switch (type) { | |
1114 | case SSH2_FXP_INIT: | |
1115 | process_init(); | |
1116 | break; | |
1117 | case SSH2_FXP_OPEN: | |
1118 | process_open(); | |
1119 | break; | |
1120 | case SSH2_FXP_CLOSE: | |
1121 | process_close(); | |
1122 | break; | |
1123 | case SSH2_FXP_READ: | |
1124 | process_read(); | |
1125 | break; | |
1126 | case SSH2_FXP_WRITE: | |
1127 | process_write(); | |
1128 | break; | |
1129 | case SSH2_FXP_LSTAT: | |
1130 | process_lstat(); | |
1131 | break; | |
1132 | case SSH2_FXP_FSTAT: | |
1133 | process_fstat(); | |
1134 | break; | |
1135 | case SSH2_FXP_SETSTAT: | |
1136 | process_setstat(); | |
1137 | break; | |
1138 | case SSH2_FXP_FSETSTAT: | |
1139 | process_fsetstat(); | |
1140 | break; | |
1141 | case SSH2_FXP_OPENDIR: | |
1142 | process_opendir(); | |
1143 | break; | |
1144 | case SSH2_FXP_READDIR: | |
1145 | process_readdir(); | |
1146 | break; | |
1147 | case SSH2_FXP_REMOVE: | |
1148 | process_remove(); | |
1149 | break; | |
1150 | case SSH2_FXP_MKDIR: | |
1151 | process_mkdir(); | |
1152 | break; | |
1153 | case SSH2_FXP_RMDIR: | |
1154 | process_rmdir(); | |
1155 | break; | |
1156 | case SSH2_FXP_REALPATH: | |
1157 | process_realpath(); | |
1158 | break; | |
1159 | case SSH2_FXP_STAT: | |
1160 | process_stat(); | |
1161 | break; | |
1162 | case SSH2_FXP_RENAME: | |
1163 | process_rename(); | |
1164 | break; | |
1165 | case SSH2_FXP_READLINK: | |
1166 | process_readlink(); | |
1167 | break; | |
1168 | case SSH2_FXP_SYMLINK: | |
1169 | process_symlink(); | |
1170 | break; | |
1171 | case SSH2_FXP_EXTENDED: | |
1172 | process_extended(); | |
1173 | break; | |
1174 | default: | |
1175 | error("Unknown message %d", type); | |
1176 | break; | |
1177 | } | |
1178 | /* discard the remaining bytes from the current packet */ | |
1179 | if (buf_len < buffer_len(&iqueue)) | |
1180 | fatal("iqueue grew unexpectedly"); | |
1181 | consumed = buf_len - buffer_len(&iqueue); | |
1182 | if (msg_len < consumed) | |
1183 | fatal("msg_len %d < consumed %d", msg_len, consumed); | |
1184 | if (msg_len > consumed) | |
1185 | buffer_consume(&iqueue, msg_len - consumed); | |
1186 | } | |
1187 | ||
1188 | /* Cleanup handler that logs active handles upon normal exit */ | |
1189 | void | |
1190 | cleanup_exit(int i) | |
1191 | { | |
1192 | if (pw != NULL && client_addr != NULL) { | |
1193 | handle_log_exit(); | |
1194 | logit("session closed for local user %s from [%s]", | |
1195 | pw->pw_name, client_addr); | |
1196 | } | |
1197 | _exit(i); | |
1198 | } | |
1199 | ||
1200 | static void | |
1201 | usage(void) | |
1202 | { | |
1203 | extern char *__progname; | |
1204 | ||
1205 | fprintf(stderr, | |
1206 | "usage: %s [-he] [-l log_level] [-f log_facility]\n", __progname); | |
1207 | exit(1); | |
1208 | } | |
1209 | ||
1210 | int | |
1211 | main(int argc, char **argv) | |
1212 | { | |
1213 | fd_set *rset, *wset; | |
1214 | int in, out, max, ch, skipargs = 0, log_stderr = 0; | |
1215 | ssize_t len, olen, set_size; | |
1216 | SyslogFacility log_facility = SYSLOG_FACILITY_AUTH; | |
1217 | char *cp, buf[4*4096]; | |
1218 | ||
1219 | extern char *optarg; | |
1220 | extern char *__progname; | |
1221 | ||
1222 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ | |
1223 | sanitise_stdfd(); | |
1224 | ||
1225 | __progname = ssh_get_progname(argv[0]); | |
1226 | log_init(__progname, log_level, log_facility, log_stderr); | |
1227 | ||
1228 | while (!skipargs && (ch = getopt(argc, argv, "C:f:l:che")) != -1) { | |
1229 | switch (ch) { | |
1230 | case 'c': | |
1231 | /* | |
1232 | * Ignore all arguments if we are invoked as a | |
1233 | * shell using "sftp-server -c command" | |
1234 | */ | |
1235 | skipargs = 1; | |
1236 | break; | |
1237 | case 'e': | |
1238 | log_stderr = 1; | |
1239 | break; | |
1240 | case 'l': | |
1241 | log_level = log_level_number(optarg); | |
1242 | if (log_level == SYSLOG_LEVEL_NOT_SET) | |
1243 | error("Invalid log level \"%s\"", optarg); | |
1244 | break; | |
1245 | case 'f': | |
1246 | log_facility = log_facility_number(optarg); | |
1247 | if (log_level == SYSLOG_FACILITY_NOT_SET) | |
1248 | error("Invalid log facility \"%s\"", optarg); | |
1249 | break; | |
1250 | case 'h': | |
1251 | default: | |
1252 | usage(); | |
1253 | } | |
1254 | } | |
1255 | ||
1256 | log_init(__progname, log_level, log_facility, log_stderr); | |
1257 | ||
1258 | if ((cp = getenv("SSH_CONNECTION")) != NULL) { | |
1259 | client_addr = xstrdup(cp); | |
1260 | if ((cp = strchr(client_addr, ' ')) == NULL) | |
1261 | fatal("Malformed SSH_CONNECTION variable: \"%s\"", | |
1262 | getenv("SSH_CONNECTION")); | |
1263 | *cp = '\0'; | |
1264 | } else | |
1265 | client_addr = xstrdup("UNKNOWN"); | |
1266 | ||
1267 | if ((pw = getpwuid(getuid())) == NULL) | |
1268 | fatal("No user found for uid %lu", (u_long)getuid()); | |
1269 | pw = pwcopy(pw); | |
1270 | ||
1271 | logit("session opened for local user %s from [%s]", | |
1272 | pw->pw_name, client_addr); | |
1273 | ||
1274 | handle_init(); | |
1275 | ||
1276 | in = dup(STDIN_FILENO); | |
1277 | out = dup(STDOUT_FILENO); | |
1278 | ||
1279 | #ifdef HAVE_CYGWIN | |
1280 | setmode(in, O_BINARY); | |
1281 | setmode(out, O_BINARY); | |
1282 | #endif | |
1283 | ||
1284 | max = 0; | |
1285 | if (in > max) | |
1286 | max = in; | |
1287 | if (out > max) | |
1288 | max = out; | |
1289 | ||
1290 | buffer_init(&iqueue); | |
1291 | buffer_init(&oqueue); | |
1292 | ||
1293 | set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask); | |
1294 | rset = (fd_set *)xmalloc(set_size); | |
1295 | wset = (fd_set *)xmalloc(set_size); | |
1296 | ||
1297 | for (;;) { | |
1298 | memset(rset, 0, set_size); | |
1299 | memset(wset, 0, set_size); | |
1300 | ||
1301 | /* | |
1302 | * Ensure that we can read a full buffer and handle | |
1303 | * the worst-case length packet it can generate, | |
1304 | * otherwise apply backpressure by stopping reads. | |
1305 | */ | |
1306 | if (buffer_check_alloc(&iqueue, sizeof(buf)) && | |
1307 | buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH)) | |
1308 | FD_SET(in, rset); | |
1309 | ||
1310 | olen = buffer_len(&oqueue); | |
1311 | if (olen > 0) | |
1312 | FD_SET(out, wset); | |
1313 | ||
1314 | if (select(max+1, rset, wset, NULL, NULL) < 0) { | |
1315 | if (errno == EINTR) | |
1316 | continue; | |
1317 | error("select: %s", strerror(errno)); | |
1318 | cleanup_exit(2); | |
1319 | } | |
1320 | ||
1321 | /* copy stdin to iqueue */ | |
1322 | if (FD_ISSET(in, rset)) { | |
1323 | len = read(in, buf, sizeof buf); | |
1324 | if (len == 0) { | |
1325 | debug("read eof"); | |
1326 | cleanup_exit(0); | |
1327 | } else if (len < 0) { | |
1328 | error("read: %s", strerror(errno)); | |
1329 | cleanup_exit(1); | |
1330 | } else { | |
1331 | buffer_append(&iqueue, buf, len); | |
1332 | } | |
1333 | } | |
1334 | /* send oqueue to stdout */ | |
1335 | if (FD_ISSET(out, wset)) { | |
1336 | len = write(out, buffer_ptr(&oqueue), olen); | |
1337 | if (len < 0) { | |
1338 | error("write: %s", strerror(errno)); | |
1339 | cleanup_exit(1); | |
1340 | } else { | |
1341 | buffer_consume(&oqueue, len); | |
1342 | } | |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * Process requests from client if we can fit the results | |
1347 | * into the output buffer, otherwise stop processing input | |
1348 | * and let the output queue drain. | |
1349 | */ | |
1350 | if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH)) | |
1351 | process(); | |
1352 | } | |
1353 | } |