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1 | /* $OpenBSD: sftp-client.c,v 1.76 2007/01/22 11:32:50 djm Exp $ */ | |
2 | /* | |
3 | * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org> | |
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 | /* XXX: memleaks */ | |
19 | /* XXX: signed vs unsigned */ | |
20 | /* XXX: remove all logging, only return status codes */ | |
21 | /* XXX: copy between two remote sites */ | |
22 | ||
23 | #include "includes.h" | |
24 | ||
25 | #include <sys/types.h> | |
26 | #include <sys/param.h> | |
27 | #include "openbsd-compat/sys-queue.h" | |
28 | #ifdef HAVE_SYS_STAT_H | |
29 | # include <sys/stat.h> | |
30 | #endif | |
31 | #ifdef HAVE_SYS_TIME_H | |
32 | # include <sys/time.h> | |
33 | #endif | |
34 | #include <sys/uio.h> | |
35 | ||
36 | #include <errno.h> | |
37 | #include <fcntl.h> | |
38 | #include <signal.h> | |
39 | #include <stdarg.h> | |
40 | #include <stdio.h> | |
41 | #include <string.h> | |
42 | #include <unistd.h> | |
43 | ||
44 | #include "xmalloc.h" | |
45 | #include "buffer.h" | |
46 | #include "log.h" | |
47 | #include "atomicio.h" | |
48 | #include "progressmeter.h" | |
49 | #include "misc.h" | |
50 | ||
51 | #include "sftp.h" | |
52 | #include "sftp-common.h" | |
53 | #include "sftp-client.h" | |
54 | ||
55 | extern volatile sig_atomic_t interrupted; | |
56 | extern int showprogress; | |
57 | ||
58 | /* Minimum amount of data to read at a time */ | |
59 | #define MIN_READ_SIZE 512 | |
60 | ||
61 | struct sftp_conn { | |
62 | int fd_in; | |
63 | int fd_out; | |
64 | u_int transfer_buflen; | |
65 | u_int num_requests; | |
66 | u_int version; | |
67 | u_int msg_id; | |
68 | }; | |
69 | ||
70 | static void | |
71 | send_msg(int fd, Buffer *m) | |
72 | { | |
73 | u_char mlen[4]; | |
74 | struct iovec iov[2]; | |
75 | ||
76 | if (buffer_len(m) > SFTP_MAX_MSG_LENGTH) | |
77 | fatal("Outbound message too long %u", buffer_len(m)); | |
78 | ||
79 | /* Send length first */ | |
80 | put_u32(mlen, buffer_len(m)); | |
81 | iov[0].iov_base = mlen; | |
82 | iov[0].iov_len = sizeof(mlen); | |
83 | iov[1].iov_base = buffer_ptr(m); | |
84 | iov[1].iov_len = buffer_len(m); | |
85 | ||
86 | if (atomiciov(writev, fd, iov, 2) != buffer_len(m) + sizeof(mlen)) | |
87 | fatal("Couldn't send packet: %s", strerror(errno)); | |
88 | ||
89 | buffer_clear(m); | |
90 | } | |
91 | ||
92 | static void | |
93 | get_msg(int fd, Buffer *m) | |
94 | { | |
95 | u_int msg_len; | |
96 | ||
97 | buffer_append_space(m, 4); | |
98 | if (atomicio(read, fd, buffer_ptr(m), 4) != 4) { | |
99 | if (errno == EPIPE) | |
100 | fatal("Connection closed"); | |
101 | else | |
102 | fatal("Couldn't read packet: %s", strerror(errno)); | |
103 | } | |
104 | ||
105 | msg_len = buffer_get_int(m); | |
106 | if (msg_len > SFTP_MAX_MSG_LENGTH) | |
107 | fatal("Received message too long %u", msg_len); | |
108 | ||
109 | buffer_append_space(m, msg_len); | |
110 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { | |
111 | if (errno == EPIPE) | |
112 | fatal("Connection closed"); | |
113 | else | |
114 | fatal("Read packet: %s", strerror(errno)); | |
115 | } | |
116 | } | |
117 | ||
118 | static void | |
119 | send_string_request(int fd, u_int id, u_int code, char *s, | |
120 | u_int len) | |
121 | { | |
122 | Buffer msg; | |
123 | ||
124 | buffer_init(&msg); | |
125 | buffer_put_char(&msg, code); | |
126 | buffer_put_int(&msg, id); | |
127 | buffer_put_string(&msg, s, len); | |
128 | send_msg(fd, &msg); | |
129 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
130 | buffer_free(&msg); | |
131 | } | |
132 | ||
133 | static void | |
134 | send_string_attrs_request(int fd, u_int id, u_int code, char *s, | |
135 | u_int len, Attrib *a) | |
136 | { | |
137 | Buffer msg; | |
138 | ||
139 | buffer_init(&msg); | |
140 | buffer_put_char(&msg, code); | |
141 | buffer_put_int(&msg, id); | |
142 | buffer_put_string(&msg, s, len); | |
143 | encode_attrib(&msg, a); | |
144 | send_msg(fd, &msg); | |
145 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
146 | buffer_free(&msg); | |
147 | } | |
148 | ||
149 | static u_int | |
150 | get_status(int fd, u_int expected_id) | |
151 | { | |
152 | Buffer msg; | |
153 | u_int type, id, status; | |
154 | ||
155 | buffer_init(&msg); | |
156 | get_msg(fd, &msg); | |
157 | type = buffer_get_char(&msg); | |
158 | id = buffer_get_int(&msg); | |
159 | ||
160 | if (id != expected_id) | |
161 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
162 | if (type != SSH2_FXP_STATUS) | |
163 | fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u", | |
164 | SSH2_FXP_STATUS, type); | |
165 | ||
166 | status = buffer_get_int(&msg); | |
167 | buffer_free(&msg); | |
168 | ||
169 | debug3("SSH2_FXP_STATUS %u", status); | |
170 | ||
171 | return(status); | |
172 | } | |
173 | ||
174 | static char * | |
175 | get_handle(int fd, u_int expected_id, u_int *len) | |
176 | { | |
177 | Buffer msg; | |
178 | u_int type, id; | |
179 | char *handle; | |
180 | ||
181 | buffer_init(&msg); | |
182 | get_msg(fd, &msg); | |
183 | type = buffer_get_char(&msg); | |
184 | id = buffer_get_int(&msg); | |
185 | ||
186 | if (id != expected_id) | |
187 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
188 | if (type == SSH2_FXP_STATUS) { | |
189 | int status = buffer_get_int(&msg); | |
190 | ||
191 | error("Couldn't get handle: %s", fx2txt(status)); | |
192 | buffer_free(&msg); | |
193 | return(NULL); | |
194 | } else if (type != SSH2_FXP_HANDLE) | |
195 | fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u", | |
196 | SSH2_FXP_HANDLE, type); | |
197 | ||
198 | handle = buffer_get_string(&msg, len); | |
199 | buffer_free(&msg); | |
200 | ||
201 | return(handle); | |
202 | } | |
203 | ||
204 | static Attrib * | |
205 | get_decode_stat(int fd, u_int expected_id, int quiet) | |
206 | { | |
207 | Buffer msg; | |
208 | u_int type, id; | |
209 | Attrib *a; | |
210 | ||
211 | buffer_init(&msg); | |
212 | get_msg(fd, &msg); | |
213 | ||
214 | type = buffer_get_char(&msg); | |
215 | id = buffer_get_int(&msg); | |
216 | ||
217 | debug3("Received stat reply T:%u I:%u", type, id); | |
218 | if (id != expected_id) | |
219 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
220 | if (type == SSH2_FXP_STATUS) { | |
221 | int status = buffer_get_int(&msg); | |
222 | ||
223 | if (quiet) | |
224 | debug("Couldn't stat remote file: %s", fx2txt(status)); | |
225 | else | |
226 | error("Couldn't stat remote file: %s", fx2txt(status)); | |
227 | buffer_free(&msg); | |
228 | return(NULL); | |
229 | } else if (type != SSH2_FXP_ATTRS) { | |
230 | fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u", | |
231 | SSH2_FXP_ATTRS, type); | |
232 | } | |
233 | a = decode_attrib(&msg); | |
234 | buffer_free(&msg); | |
235 | ||
236 | return(a); | |
237 | } | |
238 | ||
239 | struct sftp_conn * | |
240 | do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) | |
241 | { | |
242 | u_int type; | |
243 | int version; | |
244 | Buffer msg; | |
245 | struct sftp_conn *ret; | |
246 | ||
247 | buffer_init(&msg); | |
248 | buffer_put_char(&msg, SSH2_FXP_INIT); | |
249 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
250 | send_msg(fd_out, &msg); | |
251 | ||
252 | buffer_clear(&msg); | |
253 | ||
254 | get_msg(fd_in, &msg); | |
255 | ||
256 | /* Expecting a VERSION reply */ | |
257 | if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { | |
258 | error("Invalid packet back from SSH2_FXP_INIT (type %u)", | |
259 | type); | |
260 | buffer_free(&msg); | |
261 | return(NULL); | |
262 | } | |
263 | version = buffer_get_int(&msg); | |
264 | ||
265 | debug2("Remote version: %d", version); | |
266 | ||
267 | /* Check for extensions */ | |
268 | while (buffer_len(&msg) > 0) { | |
269 | char *name = buffer_get_string(&msg, NULL); | |
270 | char *value = buffer_get_string(&msg, NULL); | |
271 | ||
272 | debug2("Init extension: \"%s\"", name); | |
273 | xfree(name); | |
274 | xfree(value); | |
275 | } | |
276 | ||
277 | buffer_free(&msg); | |
278 | ||
279 | ret = xmalloc(sizeof(*ret)); | |
280 | ret->fd_in = fd_in; | |
281 | ret->fd_out = fd_out; | |
282 | ret->transfer_buflen = transfer_buflen; | |
283 | ret->num_requests = num_requests; | |
284 | ret->version = version; | |
285 | ret->msg_id = 1; | |
286 | ||
287 | /* Some filexfer v.0 servers don't support large packets */ | |
288 | if (version == 0) | |
289 | ret->transfer_buflen = MIN(ret->transfer_buflen, 20480); | |
290 | ||
291 | return(ret); | |
292 | } | |
293 | ||
294 | u_int | |
295 | sftp_proto_version(struct sftp_conn *conn) | |
296 | { | |
297 | return(conn->version); | |
298 | } | |
299 | ||
300 | int | |
301 | do_close(struct sftp_conn *conn, char *handle, u_int handle_len) | |
302 | { | |
303 | u_int id, status; | |
304 | Buffer msg; | |
305 | ||
306 | buffer_init(&msg); | |
307 | ||
308 | id = conn->msg_id++; | |
309 | buffer_put_char(&msg, SSH2_FXP_CLOSE); | |
310 | buffer_put_int(&msg, id); | |
311 | buffer_put_string(&msg, handle, handle_len); | |
312 | send_msg(conn->fd_out, &msg); | |
313 | debug3("Sent message SSH2_FXP_CLOSE I:%u", id); | |
314 | ||
315 | status = get_status(conn->fd_in, id); | |
316 | if (status != SSH2_FX_OK) | |
317 | error("Couldn't close file: %s", fx2txt(status)); | |
318 | ||
319 | buffer_free(&msg); | |
320 | ||
321 | return(status); | |
322 | } | |
323 | ||
324 | ||
325 | static int | |
326 | do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, | |
327 | SFTP_DIRENT ***dir) | |
328 | { | |
329 | Buffer msg; | |
330 | u_int count, type, id, handle_len, i, expected_id, ents = 0; | |
331 | char *handle; | |
332 | ||
333 | id = conn->msg_id++; | |
334 | ||
335 | buffer_init(&msg); | |
336 | buffer_put_char(&msg, SSH2_FXP_OPENDIR); | |
337 | buffer_put_int(&msg, id); | |
338 | buffer_put_cstring(&msg, path); | |
339 | send_msg(conn->fd_out, &msg); | |
340 | ||
341 | buffer_clear(&msg); | |
342 | ||
343 | handle = get_handle(conn->fd_in, id, &handle_len); | |
344 | if (handle == NULL) | |
345 | return(-1); | |
346 | ||
347 | if (dir) { | |
348 | ents = 0; | |
349 | *dir = xmalloc(sizeof(**dir)); | |
350 | (*dir)[0] = NULL; | |
351 | } | |
352 | ||
353 | for (; !interrupted;) { | |
354 | id = expected_id = conn->msg_id++; | |
355 | ||
356 | debug3("Sending SSH2_FXP_READDIR I:%u", id); | |
357 | ||
358 | buffer_clear(&msg); | |
359 | buffer_put_char(&msg, SSH2_FXP_READDIR); | |
360 | buffer_put_int(&msg, id); | |
361 | buffer_put_string(&msg, handle, handle_len); | |
362 | send_msg(conn->fd_out, &msg); | |
363 | ||
364 | buffer_clear(&msg); | |
365 | ||
366 | get_msg(conn->fd_in, &msg); | |
367 | ||
368 | type = buffer_get_char(&msg); | |
369 | id = buffer_get_int(&msg); | |
370 | ||
371 | debug3("Received reply T:%u I:%u", type, id); | |
372 | ||
373 | if (id != expected_id) | |
374 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
375 | ||
376 | if (type == SSH2_FXP_STATUS) { | |
377 | int status = buffer_get_int(&msg); | |
378 | ||
379 | debug3("Received SSH2_FXP_STATUS %d", status); | |
380 | ||
381 | if (status == SSH2_FX_EOF) { | |
382 | break; | |
383 | } else { | |
384 | error("Couldn't read directory: %s", | |
385 | fx2txt(status)); | |
386 | do_close(conn, handle, handle_len); | |
387 | xfree(handle); | |
388 | return(status); | |
389 | } | |
390 | } else if (type != SSH2_FXP_NAME) | |
391 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
392 | SSH2_FXP_NAME, type); | |
393 | ||
394 | count = buffer_get_int(&msg); | |
395 | if (count == 0) | |
396 | break; | |
397 | debug3("Received %d SSH2_FXP_NAME responses", count); | |
398 | for (i = 0; i < count; i++) { | |
399 | char *filename, *longname; | |
400 | Attrib *a; | |
401 | ||
402 | filename = buffer_get_string(&msg, NULL); | |
403 | longname = buffer_get_string(&msg, NULL); | |
404 | a = decode_attrib(&msg); | |
405 | ||
406 | if (printflag) | |
407 | printf("%s\n", longname); | |
408 | ||
409 | if (dir) { | |
410 | *dir = xrealloc(*dir, ents + 2, sizeof(**dir)); | |
411 | (*dir)[ents] = xmalloc(sizeof(***dir)); | |
412 | (*dir)[ents]->filename = xstrdup(filename); | |
413 | (*dir)[ents]->longname = xstrdup(longname); | |
414 | memcpy(&(*dir)[ents]->a, a, sizeof(*a)); | |
415 | (*dir)[++ents] = NULL; | |
416 | } | |
417 | ||
418 | xfree(filename); | |
419 | xfree(longname); | |
420 | } | |
421 | } | |
422 | ||
423 | buffer_free(&msg); | |
424 | do_close(conn, handle, handle_len); | |
425 | xfree(handle); | |
426 | ||
427 | /* Don't return partial matches on interrupt */ | |
428 | if (interrupted && dir != NULL && *dir != NULL) { | |
429 | free_sftp_dirents(*dir); | |
430 | *dir = xmalloc(sizeof(**dir)); | |
431 | **dir = NULL; | |
432 | } | |
433 | ||
434 | return(0); | |
435 | } | |
436 | ||
437 | int | |
438 | do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) | |
439 | { | |
440 | return(do_lsreaddir(conn, path, 0, dir)); | |
441 | } | |
442 | ||
443 | void free_sftp_dirents(SFTP_DIRENT **s) | |
444 | { | |
445 | int i; | |
446 | ||
447 | for (i = 0; s[i]; i++) { | |
448 | xfree(s[i]->filename); | |
449 | xfree(s[i]->longname); | |
450 | xfree(s[i]); | |
451 | } | |
452 | xfree(s); | |
453 | } | |
454 | ||
455 | int | |
456 | do_rm(struct sftp_conn *conn, char *path) | |
457 | { | |
458 | u_int status, id; | |
459 | ||
460 | debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); | |
461 | ||
462 | id = conn->msg_id++; | |
463 | send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, | |
464 | strlen(path)); | |
465 | status = get_status(conn->fd_in, id); | |
466 | if (status != SSH2_FX_OK) | |
467 | error("Couldn't delete file: %s", fx2txt(status)); | |
468 | return(status); | |
469 | } | |
470 | ||
471 | int | |
472 | do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) | |
473 | { | |
474 | u_int status, id; | |
475 | ||
476 | id = conn->msg_id++; | |
477 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, | |
478 | strlen(path), a); | |
479 | ||
480 | status = get_status(conn->fd_in, id); | |
481 | if (status != SSH2_FX_OK) | |
482 | error("Couldn't create directory: %s", fx2txt(status)); | |
483 | ||
484 | return(status); | |
485 | } | |
486 | ||
487 | int | |
488 | do_rmdir(struct sftp_conn *conn, char *path) | |
489 | { | |
490 | u_int status, id; | |
491 | ||
492 | id = conn->msg_id++; | |
493 | send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, | |
494 | strlen(path)); | |
495 | ||
496 | status = get_status(conn->fd_in, id); | |
497 | if (status != SSH2_FX_OK) | |
498 | error("Couldn't remove directory: %s", fx2txt(status)); | |
499 | ||
500 | return(status); | |
501 | } | |
502 | ||
503 | Attrib * | |
504 | do_stat(struct sftp_conn *conn, char *path, int quiet) | |
505 | { | |
506 | u_int id; | |
507 | ||
508 | id = conn->msg_id++; | |
509 | ||
510 | send_string_request(conn->fd_out, id, | |
511 | conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, | |
512 | path, strlen(path)); | |
513 | ||
514 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
515 | } | |
516 | ||
517 | Attrib * | |
518 | do_lstat(struct sftp_conn *conn, char *path, int quiet) | |
519 | { | |
520 | u_int id; | |
521 | ||
522 | if (conn->version == 0) { | |
523 | if (quiet) | |
524 | debug("Server version does not support lstat operation"); | |
525 | else | |
526 | logit("Server version does not support lstat operation"); | |
527 | return(do_stat(conn, path, quiet)); | |
528 | } | |
529 | ||
530 | id = conn->msg_id++; | |
531 | send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, | |
532 | strlen(path)); | |
533 | ||
534 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
535 | } | |
536 | ||
537 | Attrib * | |
538 | do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) | |
539 | { | |
540 | u_int id; | |
541 | ||
542 | id = conn->msg_id++; | |
543 | send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, | |
544 | handle_len); | |
545 | ||
546 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
547 | } | |
548 | ||
549 | int | |
550 | do_setstat(struct sftp_conn *conn, char *path, Attrib *a) | |
551 | { | |
552 | u_int status, id; | |
553 | ||
554 | id = conn->msg_id++; | |
555 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, | |
556 | strlen(path), a); | |
557 | ||
558 | status = get_status(conn->fd_in, id); | |
559 | if (status != SSH2_FX_OK) | |
560 | error("Couldn't setstat on \"%s\": %s", path, | |
561 | fx2txt(status)); | |
562 | ||
563 | return(status); | |
564 | } | |
565 | ||
566 | int | |
567 | do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, | |
568 | Attrib *a) | |
569 | { | |
570 | u_int status, id; | |
571 | ||
572 | id = conn->msg_id++; | |
573 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, | |
574 | handle_len, a); | |
575 | ||
576 | status = get_status(conn->fd_in, id); | |
577 | if (status != SSH2_FX_OK) | |
578 | error("Couldn't fsetstat: %s", fx2txt(status)); | |
579 | ||
580 | return(status); | |
581 | } | |
582 | ||
583 | char * | |
584 | do_realpath(struct sftp_conn *conn, char *path) | |
585 | { | |
586 | Buffer msg; | |
587 | u_int type, expected_id, count, id; | |
588 | char *filename, *longname; | |
589 | Attrib *a; | |
590 | ||
591 | expected_id = id = conn->msg_id++; | |
592 | send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, | |
593 | strlen(path)); | |
594 | ||
595 | buffer_init(&msg); | |
596 | ||
597 | get_msg(conn->fd_in, &msg); | |
598 | type = buffer_get_char(&msg); | |
599 | id = buffer_get_int(&msg); | |
600 | ||
601 | if (id != expected_id) | |
602 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
603 | ||
604 | if (type == SSH2_FXP_STATUS) { | |
605 | u_int status = buffer_get_int(&msg); | |
606 | ||
607 | error("Couldn't canonicalise: %s", fx2txt(status)); | |
608 | return(NULL); | |
609 | } else if (type != SSH2_FXP_NAME) | |
610 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
611 | SSH2_FXP_NAME, type); | |
612 | ||
613 | count = buffer_get_int(&msg); | |
614 | if (count != 1) | |
615 | fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); | |
616 | ||
617 | filename = buffer_get_string(&msg, NULL); | |
618 | longname = buffer_get_string(&msg, NULL); | |
619 | a = decode_attrib(&msg); | |
620 | ||
621 | debug3("SSH_FXP_REALPATH %s -> %s", path, filename); | |
622 | ||
623 | xfree(longname); | |
624 | ||
625 | buffer_free(&msg); | |
626 | ||
627 | return(filename); | |
628 | } | |
629 | ||
630 | int | |
631 | do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) | |
632 | { | |
633 | Buffer msg; | |
634 | u_int status, id; | |
635 | ||
636 | buffer_init(&msg); | |
637 | ||
638 | /* Send rename request */ | |
639 | id = conn->msg_id++; | |
640 | buffer_put_char(&msg, SSH2_FXP_RENAME); | |
641 | buffer_put_int(&msg, id); | |
642 | buffer_put_cstring(&msg, oldpath); | |
643 | buffer_put_cstring(&msg, newpath); | |
644 | send_msg(conn->fd_out, &msg); | |
645 | debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, | |
646 | newpath); | |
647 | buffer_free(&msg); | |
648 | ||
649 | status = get_status(conn->fd_in, id); | |
650 | if (status != SSH2_FX_OK) | |
651 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
652 | newpath, fx2txt(status)); | |
653 | ||
654 | return(status); | |
655 | } | |
656 | ||
657 | int | |
658 | do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) | |
659 | { | |
660 | Buffer msg; | |
661 | u_int status, id; | |
662 | ||
663 | if (conn->version < 3) { | |
664 | error("This server does not support the symlink operation"); | |
665 | return(SSH2_FX_OP_UNSUPPORTED); | |
666 | } | |
667 | ||
668 | buffer_init(&msg); | |
669 | ||
670 | /* Send symlink request */ | |
671 | id = conn->msg_id++; | |
672 | buffer_put_char(&msg, SSH2_FXP_SYMLINK); | |
673 | buffer_put_int(&msg, id); | |
674 | buffer_put_cstring(&msg, oldpath); | |
675 | buffer_put_cstring(&msg, newpath); | |
676 | send_msg(conn->fd_out, &msg); | |
677 | debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, | |
678 | newpath); | |
679 | buffer_free(&msg); | |
680 | ||
681 | status = get_status(conn->fd_in, id); | |
682 | if (status != SSH2_FX_OK) | |
683 | error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath, | |
684 | newpath, fx2txt(status)); | |
685 | ||
686 | return(status); | |
687 | } | |
688 | ||
689 | char * | |
690 | do_readlink(struct sftp_conn *conn, char *path) | |
691 | { | |
692 | Buffer msg; | |
693 | u_int type, expected_id, count, id; | |
694 | char *filename, *longname; | |
695 | Attrib *a; | |
696 | ||
697 | expected_id = id = conn->msg_id++; | |
698 | send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, | |
699 | strlen(path)); | |
700 | ||
701 | buffer_init(&msg); | |
702 | ||
703 | get_msg(conn->fd_in, &msg); | |
704 | type = buffer_get_char(&msg); | |
705 | id = buffer_get_int(&msg); | |
706 | ||
707 | if (id != expected_id) | |
708 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
709 | ||
710 | if (type == SSH2_FXP_STATUS) { | |
711 | u_int status = buffer_get_int(&msg); | |
712 | ||
713 | error("Couldn't readlink: %s", fx2txt(status)); | |
714 | return(NULL); | |
715 | } else if (type != SSH2_FXP_NAME) | |
716 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
717 | SSH2_FXP_NAME, type); | |
718 | ||
719 | count = buffer_get_int(&msg); | |
720 | if (count != 1) | |
721 | fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); | |
722 | ||
723 | filename = buffer_get_string(&msg, NULL); | |
724 | longname = buffer_get_string(&msg, NULL); | |
725 | a = decode_attrib(&msg); | |
726 | ||
727 | debug3("SSH_FXP_READLINK %s -> %s", path, filename); | |
728 | ||
729 | xfree(longname); | |
730 | ||
731 | buffer_free(&msg); | |
732 | ||
733 | return(filename); | |
734 | } | |
735 | ||
736 | static void | |
737 | send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, | |
738 | char *handle, u_int handle_len) | |
739 | { | |
740 | Buffer msg; | |
741 | ||
742 | buffer_init(&msg); | |
743 | buffer_clear(&msg); | |
744 | buffer_put_char(&msg, SSH2_FXP_READ); | |
745 | buffer_put_int(&msg, id); | |
746 | buffer_put_string(&msg, handle, handle_len); | |
747 | buffer_put_int64(&msg, offset); | |
748 | buffer_put_int(&msg, len); | |
749 | send_msg(fd_out, &msg); | |
750 | buffer_free(&msg); | |
751 | } | |
752 | ||
753 | int | |
754 | do_download(struct sftp_conn *conn, char *remote_path, char *local_path, | |
755 | int pflag) | |
756 | { | |
757 | Attrib junk, *a; | |
758 | Buffer msg; | |
759 | char *handle; | |
760 | int local_fd, status = 0, write_error; | |
761 | int read_error, write_errno; | |
762 | u_int64_t offset, size; | |
763 | u_int handle_len, mode, type, id, buflen, num_req, max_req; | |
764 | off_t progress_counter; | |
765 | struct request { | |
766 | u_int id; | |
767 | u_int len; | |
768 | u_int64_t offset; | |
769 | TAILQ_ENTRY(request) tq; | |
770 | }; | |
771 | TAILQ_HEAD(reqhead, request) requests; | |
772 | struct request *req; | |
773 | ||
774 | TAILQ_INIT(&requests); | |
775 | ||
776 | a = do_stat(conn, remote_path, 0); | |
777 | if (a == NULL) | |
778 | return(-1); | |
779 | ||
780 | /* XXX: should we preserve set[ug]id? */ | |
781 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) | |
782 | mode = a->perm & 0777; | |
783 | else | |
784 | mode = 0666; | |
785 | ||
786 | if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && | |
787 | (!S_ISREG(a->perm))) { | |
788 | error("Cannot download non-regular file: %s", remote_path); | |
789 | return(-1); | |
790 | } | |
791 | ||
792 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) | |
793 | size = a->size; | |
794 | else | |
795 | size = 0; | |
796 | ||
797 | buflen = conn->transfer_buflen; | |
798 | buffer_init(&msg); | |
799 | ||
800 | /* Send open request */ | |
801 | id = conn->msg_id++; | |
802 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
803 | buffer_put_int(&msg, id); | |
804 | buffer_put_cstring(&msg, remote_path); | |
805 | buffer_put_int(&msg, SSH2_FXF_READ); | |
806 | attrib_clear(&junk); /* Send empty attributes */ | |
807 | encode_attrib(&msg, &junk); | |
808 | send_msg(conn->fd_out, &msg); | |
809 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
810 | ||
811 | handle = get_handle(conn->fd_in, id, &handle_len); | |
812 | if (handle == NULL) { | |
813 | buffer_free(&msg); | |
814 | return(-1); | |
815 | } | |
816 | ||
817 | local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, | |
818 | mode | S_IWRITE); | |
819 | if (local_fd == -1) { | |
820 | error("Couldn't open local file \"%s\" for writing: %s", | |
821 | local_path, strerror(errno)); | |
822 | buffer_free(&msg); | |
823 | xfree(handle); | |
824 | return(-1); | |
825 | } | |
826 | ||
827 | /* Read from remote and write to local */ | |
828 | write_error = read_error = write_errno = num_req = offset = 0; | |
829 | max_req = 1; | |
830 | progress_counter = 0; | |
831 | ||
832 | if (showprogress && size != 0) | |
833 | start_progress_meter(remote_path, size, &progress_counter); | |
834 | ||
835 | while (num_req > 0 || max_req > 0) { | |
836 | char *data; | |
837 | u_int len; | |
838 | ||
839 | /* | |
840 | * Simulate EOF on interrupt: stop sending new requests and | |
841 | * allow outstanding requests to drain gracefully | |
842 | */ | |
843 | if (interrupted) { | |
844 | if (num_req == 0) /* If we haven't started yet... */ | |
845 | break; | |
846 | max_req = 0; | |
847 | } | |
848 | ||
849 | /* Send some more requests */ | |
850 | while (num_req < max_req) { | |
851 | debug3("Request range %llu -> %llu (%d/%d)", | |
852 | (unsigned long long)offset, | |
853 | (unsigned long long)offset + buflen - 1, | |
854 | num_req, max_req); | |
855 | req = xmalloc(sizeof(*req)); | |
856 | req->id = conn->msg_id++; | |
857 | req->len = buflen; | |
858 | req->offset = offset; | |
859 | offset += buflen; | |
860 | num_req++; | |
861 | TAILQ_INSERT_TAIL(&requests, req, tq); | |
862 | send_read_request(conn->fd_out, req->id, req->offset, | |
863 | req->len, handle, handle_len); | |
864 | } | |
865 | ||
866 | buffer_clear(&msg); | |
867 | get_msg(conn->fd_in, &msg); | |
868 | type = buffer_get_char(&msg); | |
869 | id = buffer_get_int(&msg); | |
870 | debug3("Received reply T:%u I:%u R:%d", type, id, max_req); | |
871 | ||
872 | /* Find the request in our queue */ | |
873 | for (req = TAILQ_FIRST(&requests); | |
874 | req != NULL && req->id != id; | |
875 | req = TAILQ_NEXT(req, tq)) | |
876 | ; | |
877 | if (req == NULL) | |
878 | fatal("Unexpected reply %u", id); | |
879 | ||
880 | switch (type) { | |
881 | case SSH2_FXP_STATUS: | |
882 | status = buffer_get_int(&msg); | |
883 | if (status != SSH2_FX_EOF) | |
884 | read_error = 1; | |
885 | max_req = 0; | |
886 | TAILQ_REMOVE(&requests, req, tq); | |
887 | xfree(req); | |
888 | num_req--; | |
889 | break; | |
890 | case SSH2_FXP_DATA: | |
891 | data = buffer_get_string(&msg, &len); | |
892 | debug3("Received data %llu -> %llu", | |
893 | (unsigned long long)req->offset, | |
894 | (unsigned long long)req->offset + len - 1); | |
895 | if (len > req->len) | |
896 | fatal("Received more data than asked for " | |
897 | "%u > %u", len, req->len); | |
898 | if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || | |
899 | atomicio(vwrite, local_fd, data, len) != len) && | |
900 | !write_error) { | |
901 | write_errno = errno; | |
902 | write_error = 1; | |
903 | max_req = 0; | |
904 | } | |
905 | progress_counter += len; | |
906 | xfree(data); | |
907 | ||
908 | if (len == req->len) { | |
909 | TAILQ_REMOVE(&requests, req, tq); | |
910 | xfree(req); | |
911 | num_req--; | |
912 | } else { | |
913 | /* Resend the request for the missing data */ | |
914 | debug3("Short data block, re-requesting " | |
915 | "%llu -> %llu (%2d)", | |
916 | (unsigned long long)req->offset + len, | |
917 | (unsigned long long)req->offset + | |
918 | req->len - 1, num_req); | |
919 | req->id = conn->msg_id++; | |
920 | req->len -= len; | |
921 | req->offset += len; | |
922 | send_read_request(conn->fd_out, req->id, | |
923 | req->offset, req->len, handle, handle_len); | |
924 | /* Reduce the request size */ | |
925 | if (len < buflen) | |
926 | buflen = MAX(MIN_READ_SIZE, len); | |
927 | } | |
928 | if (max_req > 0) { /* max_req = 0 iff EOF received */ | |
929 | if (size > 0 && offset > size) { | |
930 | /* Only one request at a time | |
931 | * after the expected EOF */ | |
932 | debug3("Finish at %llu (%2d)", | |
933 | (unsigned long long)offset, | |
934 | num_req); | |
935 | max_req = 1; | |
936 | } else if (max_req <= conn->num_requests) { | |
937 | ++max_req; | |
938 | } | |
939 | } | |
940 | break; | |
941 | default: | |
942 | fatal("Expected SSH2_FXP_DATA(%u) packet, got %u", | |
943 | SSH2_FXP_DATA, type); | |
944 | } | |
945 | } | |
946 | ||
947 | if (showprogress && size) | |
948 | stop_progress_meter(); | |
949 | ||
950 | /* Sanity check */ | |
951 | if (TAILQ_FIRST(&requests) != NULL) | |
952 | fatal("Transfer complete, but requests still in queue"); | |
953 | ||
954 | if (read_error) { | |
955 | error("Couldn't read from remote file \"%s\" : %s", | |
956 | remote_path, fx2txt(status)); | |
957 | do_close(conn, handle, handle_len); | |
958 | } else if (write_error) { | |
959 | error("Couldn't write to \"%s\": %s", local_path, | |
960 | strerror(write_errno)); | |
961 | status = -1; | |
962 | do_close(conn, handle, handle_len); | |
963 | } else { | |
964 | status = do_close(conn, handle, handle_len); | |
965 | ||
966 | /* Override umask and utimes if asked */ | |
967 | #ifdef HAVE_FCHMOD | |
968 | if (pflag && fchmod(local_fd, mode) == -1) | |
969 | #else | |
970 | if (pflag && chmod(local_path, mode) == -1) | |
971 | #endif /* HAVE_FCHMOD */ | |
972 | error("Couldn't set mode on \"%s\": %s", local_path, | |
973 | strerror(errno)); | |
974 | if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { | |
975 | struct timeval tv[2]; | |
976 | tv[0].tv_sec = a->atime; | |
977 | tv[1].tv_sec = a->mtime; | |
978 | tv[0].tv_usec = tv[1].tv_usec = 0; | |
979 | if (utimes(local_path, tv) == -1) | |
980 | error("Can't set times on \"%s\": %s", | |
981 | local_path, strerror(errno)); | |
982 | } | |
983 | } | |
984 | close(local_fd); | |
985 | buffer_free(&msg); | |
986 | xfree(handle); | |
987 | ||
988 | return(status); | |
989 | } | |
990 | ||
991 | int | |
992 | do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, | |
993 | int pflag) | |
994 | { | |
995 | int local_fd, status; | |
996 | u_int handle_len, id, type; | |
997 | u_int64_t offset; | |
998 | char *handle, *data; | |
999 | Buffer msg; | |
1000 | struct stat sb; | |
1001 | Attrib a; | |
1002 | u_int32_t startid; | |
1003 | u_int32_t ackid; | |
1004 | struct outstanding_ack { | |
1005 | u_int id; | |
1006 | u_int len; | |
1007 | u_int64_t offset; | |
1008 | TAILQ_ENTRY(outstanding_ack) tq; | |
1009 | }; | |
1010 | TAILQ_HEAD(ackhead, outstanding_ack) acks; | |
1011 | struct outstanding_ack *ack = NULL; | |
1012 | ||
1013 | TAILQ_INIT(&acks); | |
1014 | ||
1015 | if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { | |
1016 | error("Couldn't open local file \"%s\" for reading: %s", | |
1017 | local_path, strerror(errno)); | |
1018 | return(-1); | |
1019 | } | |
1020 | if (fstat(local_fd, &sb) == -1) { | |
1021 | error("Couldn't fstat local file \"%s\": %s", | |
1022 | local_path, strerror(errno)); | |
1023 | close(local_fd); | |
1024 | return(-1); | |
1025 | } | |
1026 | if (!S_ISREG(sb.st_mode)) { | |
1027 | error("%s is not a regular file", local_path); | |
1028 | close(local_fd); | |
1029 | return(-1); | |
1030 | } | |
1031 | stat_to_attrib(&sb, &a); | |
1032 | ||
1033 | a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; | |
1034 | a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; | |
1035 | a.perm &= 0777; | |
1036 | if (!pflag) | |
1037 | a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; | |
1038 | ||
1039 | buffer_init(&msg); | |
1040 | ||
1041 | /* Send open request */ | |
1042 | id = conn->msg_id++; | |
1043 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
1044 | buffer_put_int(&msg, id); | |
1045 | buffer_put_cstring(&msg, remote_path); | |
1046 | buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); | |
1047 | encode_attrib(&msg, &a); | |
1048 | send_msg(conn->fd_out, &msg); | |
1049 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
1050 | ||
1051 | buffer_clear(&msg); | |
1052 | ||
1053 | handle = get_handle(conn->fd_in, id, &handle_len); | |
1054 | if (handle == NULL) { | |
1055 | close(local_fd); | |
1056 | buffer_free(&msg); | |
1057 | return(-1); | |
1058 | } | |
1059 | ||
1060 | startid = ackid = id + 1; | |
1061 | data = xmalloc(conn->transfer_buflen); | |
1062 | ||
1063 | /* Read from local and write to remote */ | |
1064 | offset = 0; | |
1065 | if (showprogress) | |
1066 | start_progress_meter(local_path, sb.st_size, &offset); | |
1067 | ||
1068 | for (;;) { | |
1069 | int len; | |
1070 | ||
1071 | /* | |
1072 | * Can't use atomicio here because it returns 0 on EOF, | |
1073 | * thus losing the last block of the file. | |
1074 | * Simulate an EOF on interrupt, allowing ACKs from the | |
1075 | * server to drain. | |
1076 | */ | |
1077 | if (interrupted) | |
1078 | len = 0; | |
1079 | else do | |
1080 | len = read(local_fd, data, conn->transfer_buflen); | |
1081 | while ((len == -1) && (errno == EINTR || errno == EAGAIN)); | |
1082 | ||
1083 | if (len == -1) | |
1084 | fatal("Couldn't read from \"%s\": %s", local_path, | |
1085 | strerror(errno)); | |
1086 | ||
1087 | if (len != 0) { | |
1088 | ack = xmalloc(sizeof(*ack)); | |
1089 | ack->id = ++id; | |
1090 | ack->offset = offset; | |
1091 | ack->len = len; | |
1092 | TAILQ_INSERT_TAIL(&acks, ack, tq); | |
1093 | ||
1094 | buffer_clear(&msg); | |
1095 | buffer_put_char(&msg, SSH2_FXP_WRITE); | |
1096 | buffer_put_int(&msg, ack->id); | |
1097 | buffer_put_string(&msg, handle, handle_len); | |
1098 | buffer_put_int64(&msg, offset); | |
1099 | buffer_put_string(&msg, data, len); | |
1100 | send_msg(conn->fd_out, &msg); | |
1101 | debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u", | |
1102 | id, (unsigned long long)offset, len); | |
1103 | } else if (TAILQ_FIRST(&acks) == NULL) | |
1104 | break; | |
1105 | ||
1106 | if (ack == NULL) | |
1107 | fatal("Unexpected ACK %u", id); | |
1108 | ||
1109 | if (id == startid || len == 0 || | |
1110 | id - ackid >= conn->num_requests) { | |
1111 | u_int r_id; | |
1112 | ||
1113 | buffer_clear(&msg); | |
1114 | get_msg(conn->fd_in, &msg); | |
1115 | type = buffer_get_char(&msg); | |
1116 | r_id = buffer_get_int(&msg); | |
1117 | ||
1118 | if (type != SSH2_FXP_STATUS) | |
1119 | fatal("Expected SSH2_FXP_STATUS(%d) packet, " | |
1120 | "got %d", SSH2_FXP_STATUS, type); | |
1121 | ||
1122 | status = buffer_get_int(&msg); | |
1123 | debug3("SSH2_FXP_STATUS %d", status); | |
1124 | ||
1125 | /* Find the request in our queue */ | |
1126 | for (ack = TAILQ_FIRST(&acks); | |
1127 | ack != NULL && ack->id != r_id; | |
1128 | ack = TAILQ_NEXT(ack, tq)) | |
1129 | ; | |
1130 | if (ack == NULL) | |
1131 | fatal("Can't find request for ID %u", r_id); | |
1132 | TAILQ_REMOVE(&acks, ack, tq); | |
1133 | ||
1134 | if (status != SSH2_FX_OK) { | |
1135 | error("Couldn't write to remote file \"%s\": %s", | |
1136 | remote_path, fx2txt(status)); | |
1137 | if (showprogress) | |
1138 | stop_progress_meter(); | |
1139 | do_close(conn, handle, handle_len); | |
1140 | close(local_fd); | |
1141 | xfree(data); | |
1142 | xfree(ack); | |
1143 | status = -1; | |
1144 | goto done; | |
1145 | } | |
1146 | debug3("In write loop, ack for %u %u bytes at %llu", | |
1147 | ack->id, ack->len, (unsigned long long)ack->offset); | |
1148 | ++ackid; | |
1149 | xfree(ack); | |
1150 | } | |
1151 | offset += len; | |
1152 | } | |
1153 | if (showprogress) | |
1154 | stop_progress_meter(); | |
1155 | xfree(data); | |
1156 | ||
1157 | if (close(local_fd) == -1) { | |
1158 | error("Couldn't close local file \"%s\": %s", local_path, | |
1159 | strerror(errno)); | |
1160 | do_close(conn, handle, handle_len); | |
1161 | status = -1; | |
1162 | goto done; | |
1163 | } | |
1164 | ||
1165 | /* Override umask and utimes if asked */ | |
1166 | if (pflag) | |
1167 | do_fsetstat(conn, handle, handle_len, &a); | |
1168 | ||
1169 | status = do_close(conn, handle, handle_len); | |
1170 | ||
1171 | done: | |
1172 | xfree(handle); | |
1173 | buffer_free(&msg); | |
1174 | return(status); | |
1175 | } |