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1 | /* $OpenBSD: sftp-client.c,v 1.65 2006/04/16 00:54:10 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 | #ifdef HAVE_SYS_STAT_H | |
27 | # include <sys/stat.h> | |
28 | #endif | |
29 | # include <signal.h> | |
30 | ||
31 | #include "openbsd-compat/sys-queue.h" | |
32 | ||
33 | #include "buffer.h" | |
34 | #include "bufaux.h" | |
35 | #include "xmalloc.h" | |
36 | #include "log.h" | |
37 | #include "atomicio.h" | |
38 | #include "progressmeter.h" | |
39 | #include "misc.h" | |
40 | ||
41 | #include "sftp.h" | |
42 | #include "sftp-common.h" | |
43 | #include "sftp-client.h" | |
44 | ||
45 | extern volatile sig_atomic_t interrupted; | |
46 | extern int showprogress; | |
47 | ||
48 | /* Minimum amount of data to read at a time */ | |
49 | #define MIN_READ_SIZE 512 | |
50 | ||
51 | struct sftp_conn { | |
52 | int fd_in; | |
53 | int fd_out; | |
54 | u_int transfer_buflen; | |
55 | u_int num_requests; | |
56 | u_int version; | |
57 | u_int msg_id; | |
58 | }; | |
59 | ||
60 | static void | |
61 | send_msg(int fd, Buffer *m) | |
62 | { | |
63 | u_char mlen[4]; | |
64 | struct iovec iov[2]; | |
65 | ||
66 | if (buffer_len(m) > SFTP_MAX_MSG_LENGTH) | |
67 | fatal("Outbound message too long %u", buffer_len(m)); | |
68 | ||
69 | /* Send length first */ | |
70 | put_u32(mlen, buffer_len(m)); | |
71 | iov[0].iov_base = mlen; | |
72 | iov[0].iov_len = sizeof(mlen); | |
73 | iov[1].iov_base = buffer_ptr(m); | |
74 | iov[1].iov_len = buffer_len(m); | |
75 | ||
76 | if (atomiciov(writev, fd, iov, 2) != buffer_len(m) + sizeof(mlen)) | |
77 | fatal("Couldn't send packet: %s", strerror(errno)); | |
78 | ||
79 | buffer_clear(m); | |
80 | } | |
81 | ||
82 | static void | |
83 | get_msg(int fd, Buffer *m) | |
84 | { | |
85 | u_int msg_len; | |
86 | ||
87 | buffer_append_space(m, 4); | |
88 | if (atomicio(read, fd, buffer_ptr(m), 4) != 4) { | |
89 | if (errno == EPIPE) | |
90 | fatal("Connection closed"); | |
91 | else | |
92 | fatal("Couldn't read packet: %s", strerror(errno)); | |
93 | } | |
94 | ||
95 | msg_len = buffer_get_int(m); | |
96 | if (msg_len > SFTP_MAX_MSG_LENGTH) | |
97 | fatal("Received message too long %u", msg_len); | |
98 | ||
99 | buffer_append_space(m, msg_len); | |
100 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { | |
101 | if (errno == EPIPE) | |
102 | fatal("Connection closed"); | |
103 | else | |
104 | fatal("Read packet: %s", strerror(errno)); | |
105 | } | |
106 | } | |
107 | ||
108 | static void | |
109 | send_string_request(int fd, u_int id, u_int code, char *s, | |
110 | u_int len) | |
111 | { | |
112 | Buffer msg; | |
113 | ||
114 | buffer_init(&msg); | |
115 | buffer_put_char(&msg, code); | |
116 | buffer_put_int(&msg, id); | |
117 | buffer_put_string(&msg, s, len); | |
118 | send_msg(fd, &msg); | |
119 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
120 | buffer_free(&msg); | |
121 | } | |
122 | ||
123 | static void | |
124 | send_string_attrs_request(int fd, u_int id, u_int code, char *s, | |
125 | u_int len, Attrib *a) | |
126 | { | |
127 | Buffer msg; | |
128 | ||
129 | buffer_init(&msg); | |
130 | buffer_put_char(&msg, code); | |
131 | buffer_put_int(&msg, id); | |
132 | buffer_put_string(&msg, s, len); | |
133 | encode_attrib(&msg, a); | |
134 | send_msg(fd, &msg); | |
135 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
136 | buffer_free(&msg); | |
137 | } | |
138 | ||
139 | static u_int | |
140 | get_status(int fd, u_int expected_id) | |
141 | { | |
142 | Buffer msg; | |
143 | u_int type, id, status; | |
144 | ||
145 | buffer_init(&msg); | |
146 | get_msg(fd, &msg); | |
147 | type = buffer_get_char(&msg); | |
148 | id = buffer_get_int(&msg); | |
149 | ||
150 | if (id != expected_id) | |
151 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
152 | if (type != SSH2_FXP_STATUS) | |
153 | fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u", | |
154 | SSH2_FXP_STATUS, type); | |
155 | ||
156 | status = buffer_get_int(&msg); | |
157 | buffer_free(&msg); | |
158 | ||
159 | debug3("SSH2_FXP_STATUS %u", status); | |
160 | ||
161 | return(status); | |
162 | } | |
163 | ||
164 | static char * | |
165 | get_handle(int fd, u_int expected_id, u_int *len) | |
166 | { | |
167 | Buffer msg; | |
168 | u_int type, id; | |
169 | char *handle; | |
170 | ||
171 | buffer_init(&msg); | |
172 | get_msg(fd, &msg); | |
173 | type = buffer_get_char(&msg); | |
174 | id = buffer_get_int(&msg); | |
175 | ||
176 | if (id != expected_id) | |
177 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
178 | if (type == SSH2_FXP_STATUS) { | |
179 | int status = buffer_get_int(&msg); | |
180 | ||
181 | error("Couldn't get handle: %s", fx2txt(status)); | |
182 | buffer_free(&msg); | |
183 | return(NULL); | |
184 | } else if (type != SSH2_FXP_HANDLE) | |
185 | fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u", | |
186 | SSH2_FXP_HANDLE, type); | |
187 | ||
188 | handle = buffer_get_string(&msg, len); | |
189 | buffer_free(&msg); | |
190 | ||
191 | return(handle); | |
192 | } | |
193 | ||
194 | static Attrib * | |
195 | get_decode_stat(int fd, u_int expected_id, int quiet) | |
196 | { | |
197 | Buffer msg; | |
198 | u_int type, id; | |
199 | Attrib *a; | |
200 | ||
201 | buffer_init(&msg); | |
202 | get_msg(fd, &msg); | |
203 | ||
204 | type = buffer_get_char(&msg); | |
205 | id = buffer_get_int(&msg); | |
206 | ||
207 | debug3("Received stat reply T:%u I:%u", type, id); | |
208 | if (id != expected_id) | |
209 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
210 | if (type == SSH2_FXP_STATUS) { | |
211 | int status = buffer_get_int(&msg); | |
212 | ||
213 | if (quiet) | |
214 | debug("Couldn't stat remote file: %s", fx2txt(status)); | |
215 | else | |
216 | error("Couldn't stat remote file: %s", fx2txt(status)); | |
217 | buffer_free(&msg); | |
218 | return(NULL); | |
219 | } else if (type != SSH2_FXP_ATTRS) { | |
220 | fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u", | |
221 | SSH2_FXP_ATTRS, type); | |
222 | } | |
223 | a = decode_attrib(&msg); | |
224 | buffer_free(&msg); | |
225 | ||
226 | return(a); | |
227 | } | |
228 | ||
229 | struct sftp_conn * | |
230 | do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) | |
231 | { | |
232 | u_int type; | |
233 | int version; | |
234 | Buffer msg; | |
235 | struct sftp_conn *ret; | |
236 | ||
237 | buffer_init(&msg); | |
238 | buffer_put_char(&msg, SSH2_FXP_INIT); | |
239 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
240 | send_msg(fd_out, &msg); | |
241 | ||
242 | buffer_clear(&msg); | |
243 | ||
244 | get_msg(fd_in, &msg); | |
245 | ||
246 | /* Expecting a VERSION reply */ | |
247 | if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { | |
248 | error("Invalid packet back from SSH2_FXP_INIT (type %u)", | |
249 | type); | |
250 | buffer_free(&msg); | |
251 | return(NULL); | |
252 | } | |
253 | version = buffer_get_int(&msg); | |
254 | ||
255 | debug2("Remote version: %d", version); | |
256 | ||
257 | /* Check for extensions */ | |
258 | while (buffer_len(&msg) > 0) { | |
259 | char *name = buffer_get_string(&msg, NULL); | |
260 | char *value = buffer_get_string(&msg, NULL); | |
261 | ||
262 | debug2("Init extension: \"%s\"", name); | |
263 | xfree(name); | |
264 | xfree(value); | |
265 | } | |
266 | ||
267 | buffer_free(&msg); | |
268 | ||
269 | ret = xmalloc(sizeof(*ret)); | |
270 | ret->fd_in = fd_in; | |
271 | ret->fd_out = fd_out; | |
272 | ret->transfer_buflen = transfer_buflen; | |
273 | ret->num_requests = num_requests; | |
274 | ret->version = version; | |
275 | ret->msg_id = 1; | |
276 | ||
277 | /* Some filexfer v.0 servers don't support large packets */ | |
278 | if (version == 0) | |
279 | ret->transfer_buflen = MIN(ret->transfer_buflen, 20480); | |
280 | ||
281 | return(ret); | |
282 | } | |
283 | ||
284 | u_int | |
285 | sftp_proto_version(struct sftp_conn *conn) | |
286 | { | |
287 | return(conn->version); | |
288 | } | |
289 | ||
290 | int | |
291 | do_close(struct sftp_conn *conn, char *handle, u_int handle_len) | |
292 | { | |
293 | u_int id, status; | |
294 | Buffer msg; | |
295 | ||
296 | buffer_init(&msg); | |
297 | ||
298 | id = conn->msg_id++; | |
299 | buffer_put_char(&msg, SSH2_FXP_CLOSE); | |
300 | buffer_put_int(&msg, id); | |
301 | buffer_put_string(&msg, handle, handle_len); | |
302 | send_msg(conn->fd_out, &msg); | |
303 | debug3("Sent message SSH2_FXP_CLOSE I:%u", id); | |
304 | ||
305 | status = get_status(conn->fd_in, id); | |
306 | if (status != SSH2_FX_OK) | |
307 | error("Couldn't close file: %s", fx2txt(status)); | |
308 | ||
309 | buffer_free(&msg); | |
310 | ||
311 | return(status); | |
312 | } | |
313 | ||
314 | ||
315 | static int | |
316 | do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, | |
317 | SFTP_DIRENT ***dir) | |
318 | { | |
319 | Buffer msg; | |
320 | u_int count, type, id, handle_len, i, expected_id, ents = 0; | |
321 | char *handle; | |
322 | ||
323 | id = conn->msg_id++; | |
324 | ||
325 | buffer_init(&msg); | |
326 | buffer_put_char(&msg, SSH2_FXP_OPENDIR); | |
327 | buffer_put_int(&msg, id); | |
328 | buffer_put_cstring(&msg, path); | |
329 | send_msg(conn->fd_out, &msg); | |
330 | ||
331 | buffer_clear(&msg); | |
332 | ||
333 | handle = get_handle(conn->fd_in, id, &handle_len); | |
334 | if (handle == NULL) | |
335 | return(-1); | |
336 | ||
337 | if (dir) { | |
338 | ents = 0; | |
339 | *dir = xmalloc(sizeof(**dir)); | |
340 | (*dir)[0] = NULL; | |
341 | } | |
342 | ||
343 | for (; !interrupted;) { | |
344 | id = expected_id = conn->msg_id++; | |
345 | ||
346 | debug3("Sending SSH2_FXP_READDIR I:%u", id); | |
347 | ||
348 | buffer_clear(&msg); | |
349 | buffer_put_char(&msg, SSH2_FXP_READDIR); | |
350 | buffer_put_int(&msg, id); | |
351 | buffer_put_string(&msg, handle, handle_len); | |
352 | send_msg(conn->fd_out, &msg); | |
353 | ||
354 | buffer_clear(&msg); | |
355 | ||
356 | get_msg(conn->fd_in, &msg); | |
357 | ||
358 | type = buffer_get_char(&msg); | |
359 | id = buffer_get_int(&msg); | |
360 | ||
361 | debug3("Received reply T:%u I:%u", type, id); | |
362 | ||
363 | if (id != expected_id) | |
364 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
365 | ||
366 | if (type == SSH2_FXP_STATUS) { | |
367 | int status = buffer_get_int(&msg); | |
368 | ||
369 | debug3("Received SSH2_FXP_STATUS %d", status); | |
370 | ||
371 | if (status == SSH2_FX_EOF) { | |
372 | break; | |
373 | } else { | |
374 | error("Couldn't read directory: %s", | |
375 | fx2txt(status)); | |
376 | do_close(conn, handle, handle_len); | |
377 | xfree(handle); | |
378 | return(status); | |
379 | } | |
380 | } else if (type != SSH2_FXP_NAME) | |
381 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
382 | SSH2_FXP_NAME, type); | |
383 | ||
384 | count = buffer_get_int(&msg); | |
385 | if (count == 0) | |
386 | break; | |
387 | debug3("Received %d SSH2_FXP_NAME responses", count); | |
388 | for (i = 0; i < count; i++) { | |
389 | char *filename, *longname; | |
390 | Attrib *a; | |
391 | ||
392 | filename = buffer_get_string(&msg, NULL); | |
393 | longname = buffer_get_string(&msg, NULL); | |
394 | a = decode_attrib(&msg); | |
395 | ||
396 | if (printflag) | |
397 | printf("%s\n", longname); | |
398 | ||
399 | if (dir) { | |
400 | *dir = xrealloc(*dir, ents + 2, sizeof(**dir)); | |
401 | (*dir)[ents] = xmalloc(sizeof(***dir)); | |
402 | (*dir)[ents]->filename = xstrdup(filename); | |
403 | (*dir)[ents]->longname = xstrdup(longname); | |
404 | memcpy(&(*dir)[ents]->a, a, sizeof(*a)); | |
405 | (*dir)[++ents] = NULL; | |
406 | } | |
407 | ||
408 | xfree(filename); | |
409 | xfree(longname); | |
410 | } | |
411 | } | |
412 | ||
413 | buffer_free(&msg); | |
414 | do_close(conn, handle, handle_len); | |
415 | xfree(handle); | |
416 | ||
417 | /* Don't return partial matches on interrupt */ | |
418 | if (interrupted && dir != NULL && *dir != NULL) { | |
419 | free_sftp_dirents(*dir); | |
420 | *dir = xmalloc(sizeof(**dir)); | |
421 | **dir = NULL; | |
422 | } | |
423 | ||
424 | return(0); | |
425 | } | |
426 | ||
427 | int | |
428 | do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) | |
429 | { | |
430 | return(do_lsreaddir(conn, path, 0, dir)); | |
431 | } | |
432 | ||
433 | void free_sftp_dirents(SFTP_DIRENT **s) | |
434 | { | |
435 | int i; | |
436 | ||
437 | for (i = 0; s[i]; i++) { | |
438 | xfree(s[i]->filename); | |
439 | xfree(s[i]->longname); | |
440 | xfree(s[i]); | |
441 | } | |
442 | xfree(s); | |
443 | } | |
444 | ||
445 | int | |
446 | do_rm(struct sftp_conn *conn, char *path) | |
447 | { | |
448 | u_int status, id; | |
449 | ||
450 | debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); | |
451 | ||
452 | id = conn->msg_id++; | |
453 | send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, | |
454 | strlen(path)); | |
455 | status = get_status(conn->fd_in, id); | |
456 | if (status != SSH2_FX_OK) | |
457 | error("Couldn't delete file: %s", fx2txt(status)); | |
458 | return(status); | |
459 | } | |
460 | ||
461 | int | |
462 | do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) | |
463 | { | |
464 | u_int status, id; | |
465 | ||
466 | id = conn->msg_id++; | |
467 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, | |
468 | strlen(path), a); | |
469 | ||
470 | status = get_status(conn->fd_in, id); | |
471 | if (status != SSH2_FX_OK) | |
472 | error("Couldn't create directory: %s", fx2txt(status)); | |
473 | ||
474 | return(status); | |
475 | } | |
476 | ||
477 | int | |
478 | do_rmdir(struct sftp_conn *conn, char *path) | |
479 | { | |
480 | u_int status, id; | |
481 | ||
482 | id = conn->msg_id++; | |
483 | send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, | |
484 | strlen(path)); | |
485 | ||
486 | status = get_status(conn->fd_in, id); | |
487 | if (status != SSH2_FX_OK) | |
488 | error("Couldn't remove directory: %s", fx2txt(status)); | |
489 | ||
490 | return(status); | |
491 | } | |
492 | ||
493 | Attrib * | |
494 | do_stat(struct sftp_conn *conn, char *path, int quiet) | |
495 | { | |
496 | u_int id; | |
497 | ||
498 | id = conn->msg_id++; | |
499 | ||
500 | send_string_request(conn->fd_out, id, | |
501 | conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, | |
502 | path, strlen(path)); | |
503 | ||
504 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
505 | } | |
506 | ||
507 | Attrib * | |
508 | do_lstat(struct sftp_conn *conn, char *path, int quiet) | |
509 | { | |
510 | u_int id; | |
511 | ||
512 | if (conn->version == 0) { | |
513 | if (quiet) | |
514 | debug("Server version does not support lstat operation"); | |
515 | else | |
516 | logit("Server version does not support lstat operation"); | |
517 | return(do_stat(conn, path, quiet)); | |
518 | } | |
519 | ||
520 | id = conn->msg_id++; | |
521 | send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, | |
522 | strlen(path)); | |
523 | ||
524 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
525 | } | |
526 | ||
527 | Attrib * | |
528 | do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) | |
529 | { | |
530 | u_int id; | |
531 | ||
532 | id = conn->msg_id++; | |
533 | send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, | |
534 | handle_len); | |
535 | ||
536 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
537 | } | |
538 | ||
539 | int | |
540 | do_setstat(struct sftp_conn *conn, char *path, Attrib *a) | |
541 | { | |
542 | u_int status, id; | |
543 | ||
544 | id = conn->msg_id++; | |
545 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, | |
546 | strlen(path), a); | |
547 | ||
548 | status = get_status(conn->fd_in, id); | |
549 | if (status != SSH2_FX_OK) | |
550 | error("Couldn't setstat on \"%s\": %s", path, | |
551 | fx2txt(status)); | |
552 | ||
553 | return(status); | |
554 | } | |
555 | ||
556 | int | |
557 | do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, | |
558 | Attrib *a) | |
559 | { | |
560 | u_int status, id; | |
561 | ||
562 | id = conn->msg_id++; | |
563 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, | |
564 | handle_len, a); | |
565 | ||
566 | status = get_status(conn->fd_in, id); | |
567 | if (status != SSH2_FX_OK) | |
568 | error("Couldn't fsetstat: %s", fx2txt(status)); | |
569 | ||
570 | return(status); | |
571 | } | |
572 | ||
573 | char * | |
574 | do_realpath(struct sftp_conn *conn, char *path) | |
575 | { | |
576 | Buffer msg; | |
577 | u_int type, expected_id, count, id; | |
578 | char *filename, *longname; | |
579 | Attrib *a; | |
580 | ||
581 | expected_id = id = conn->msg_id++; | |
582 | send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, | |
583 | strlen(path)); | |
584 | ||
585 | buffer_init(&msg); | |
586 | ||
587 | get_msg(conn->fd_in, &msg); | |
588 | type = buffer_get_char(&msg); | |
589 | id = buffer_get_int(&msg); | |
590 | ||
591 | if (id != expected_id) | |
592 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
593 | ||
594 | if (type == SSH2_FXP_STATUS) { | |
595 | u_int status = buffer_get_int(&msg); | |
596 | ||
597 | error("Couldn't canonicalise: %s", fx2txt(status)); | |
598 | return(NULL); | |
599 | } else if (type != SSH2_FXP_NAME) | |
600 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
601 | SSH2_FXP_NAME, type); | |
602 | ||
603 | count = buffer_get_int(&msg); | |
604 | if (count != 1) | |
605 | fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); | |
606 | ||
607 | filename = buffer_get_string(&msg, NULL); | |
608 | longname = buffer_get_string(&msg, NULL); | |
609 | a = decode_attrib(&msg); | |
610 | ||
611 | debug3("SSH_FXP_REALPATH %s -> %s", path, filename); | |
612 | ||
613 | xfree(longname); | |
614 | ||
615 | buffer_free(&msg); | |
616 | ||
617 | return(filename); | |
618 | } | |
619 | ||
620 | int | |
621 | do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) | |
622 | { | |
623 | Buffer msg; | |
624 | u_int status, id; | |
625 | ||
626 | buffer_init(&msg); | |
627 | ||
628 | /* Send rename request */ | |
629 | id = conn->msg_id++; | |
630 | buffer_put_char(&msg, SSH2_FXP_RENAME); | |
631 | buffer_put_int(&msg, id); | |
632 | buffer_put_cstring(&msg, oldpath); | |
633 | buffer_put_cstring(&msg, newpath); | |
634 | send_msg(conn->fd_out, &msg); | |
635 | debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, | |
636 | newpath); | |
637 | buffer_free(&msg); | |
638 | ||
639 | status = get_status(conn->fd_in, id); | |
640 | if (status != SSH2_FX_OK) | |
641 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
642 | newpath, fx2txt(status)); | |
643 | ||
644 | return(status); | |
645 | } | |
646 | ||
647 | int | |
648 | do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) | |
649 | { | |
650 | Buffer msg; | |
651 | u_int status, id; | |
652 | ||
653 | if (conn->version < 3) { | |
654 | error("This server does not support the symlink operation"); | |
655 | return(SSH2_FX_OP_UNSUPPORTED); | |
656 | } | |
657 | ||
658 | buffer_init(&msg); | |
659 | ||
660 | /* Send symlink request */ | |
661 | id = conn->msg_id++; | |
662 | buffer_put_char(&msg, SSH2_FXP_SYMLINK); | |
663 | buffer_put_int(&msg, id); | |
664 | buffer_put_cstring(&msg, oldpath); | |
665 | buffer_put_cstring(&msg, newpath); | |
666 | send_msg(conn->fd_out, &msg); | |
667 | debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, | |
668 | newpath); | |
669 | buffer_free(&msg); | |
670 | ||
671 | status = get_status(conn->fd_in, id); | |
672 | if (status != SSH2_FX_OK) | |
673 | error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath, | |
674 | newpath, fx2txt(status)); | |
675 | ||
676 | return(status); | |
677 | } | |
678 | ||
679 | char * | |
680 | do_readlink(struct sftp_conn *conn, char *path) | |
681 | { | |
682 | Buffer msg; | |
683 | u_int type, expected_id, count, id; | |
684 | char *filename, *longname; | |
685 | Attrib *a; | |
686 | ||
687 | expected_id = id = conn->msg_id++; | |
688 | send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, | |
689 | strlen(path)); | |
690 | ||
691 | buffer_init(&msg); | |
692 | ||
693 | get_msg(conn->fd_in, &msg); | |
694 | type = buffer_get_char(&msg); | |
695 | id = buffer_get_int(&msg); | |
696 | ||
697 | if (id != expected_id) | |
698 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
699 | ||
700 | if (type == SSH2_FXP_STATUS) { | |
701 | u_int status = buffer_get_int(&msg); | |
702 | ||
703 | error("Couldn't readlink: %s", fx2txt(status)); | |
704 | return(NULL); | |
705 | } else if (type != SSH2_FXP_NAME) | |
706 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
707 | SSH2_FXP_NAME, type); | |
708 | ||
709 | count = buffer_get_int(&msg); | |
710 | if (count != 1) | |
711 | fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); | |
712 | ||
713 | filename = buffer_get_string(&msg, NULL); | |
714 | longname = buffer_get_string(&msg, NULL); | |
715 | a = decode_attrib(&msg); | |
716 | ||
717 | debug3("SSH_FXP_READLINK %s -> %s", path, filename); | |
718 | ||
719 | xfree(longname); | |
720 | ||
721 | buffer_free(&msg); | |
722 | ||
723 | return(filename); | |
724 | } | |
725 | ||
726 | static void | |
727 | send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, | |
728 | char *handle, u_int handle_len) | |
729 | { | |
730 | Buffer msg; | |
731 | ||
732 | buffer_init(&msg); | |
733 | buffer_clear(&msg); | |
734 | buffer_put_char(&msg, SSH2_FXP_READ); | |
735 | buffer_put_int(&msg, id); | |
736 | buffer_put_string(&msg, handle, handle_len); | |
737 | buffer_put_int64(&msg, offset); | |
738 | buffer_put_int(&msg, len); | |
739 | send_msg(fd_out, &msg); | |
740 | buffer_free(&msg); | |
741 | } | |
742 | ||
743 | int | |
744 | do_download(struct sftp_conn *conn, char *remote_path, char *local_path, | |
745 | int pflag) | |
746 | { | |
747 | Attrib junk, *a; | |
748 | Buffer msg; | |
749 | char *handle; | |
750 | int local_fd, status = 0, write_error; | |
751 | int read_error, write_errno; | |
752 | u_int64_t offset, size; | |
753 | u_int handle_len, mode, type, id, buflen, num_req, max_req; | |
754 | off_t progress_counter; | |
755 | struct request { | |
756 | u_int id; | |
757 | u_int len; | |
758 | u_int64_t offset; | |
759 | TAILQ_ENTRY(request) tq; | |
760 | }; | |
761 | TAILQ_HEAD(reqhead, request) requests; | |
762 | struct request *req; | |
763 | ||
764 | TAILQ_INIT(&requests); | |
765 | ||
766 | a = do_stat(conn, remote_path, 0); | |
767 | if (a == NULL) | |
768 | return(-1); | |
769 | ||
770 | /* XXX: should we preserve set[ug]id? */ | |
771 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) | |
772 | mode = a->perm & 0777; | |
773 | else | |
774 | mode = 0666; | |
775 | ||
776 | if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && | |
777 | (!S_ISREG(a->perm))) { | |
778 | error("Cannot download non-regular file: %s", remote_path); | |
779 | return(-1); | |
780 | } | |
781 | ||
782 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) | |
783 | size = a->size; | |
784 | else | |
785 | size = 0; | |
786 | ||
787 | buflen = conn->transfer_buflen; | |
788 | buffer_init(&msg); | |
789 | ||
790 | /* Send open request */ | |
791 | id = conn->msg_id++; | |
792 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
793 | buffer_put_int(&msg, id); | |
794 | buffer_put_cstring(&msg, remote_path); | |
795 | buffer_put_int(&msg, SSH2_FXF_READ); | |
796 | attrib_clear(&junk); /* Send empty attributes */ | |
797 | encode_attrib(&msg, &junk); | |
798 | send_msg(conn->fd_out, &msg); | |
799 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
800 | ||
801 | handle = get_handle(conn->fd_in, id, &handle_len); | |
802 | if (handle == NULL) { | |
803 | buffer_free(&msg); | |
804 | return(-1); | |
805 | } | |
806 | ||
807 | local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, | |
808 | mode | S_IWRITE); | |
809 | if (local_fd == -1) { | |
810 | error("Couldn't open local file \"%s\" for writing: %s", | |
811 | local_path, strerror(errno)); | |
812 | buffer_free(&msg); | |
813 | xfree(handle); | |
814 | return(-1); | |
815 | } | |
816 | ||
817 | /* Read from remote and write to local */ | |
818 | write_error = read_error = write_errno = num_req = offset = 0; | |
819 | max_req = 1; | |
820 | progress_counter = 0; | |
821 | ||
822 | if (showprogress && size != 0) | |
823 | start_progress_meter(remote_path, size, &progress_counter); | |
824 | ||
825 | while (num_req > 0 || max_req > 0) { | |
826 | char *data; | |
827 | u_int len; | |
828 | ||
829 | /* | |
830 | * Simulate EOF on interrupt: stop sending new requests and | |
831 | * allow outstanding requests to drain gracefully | |
832 | */ | |
833 | if (interrupted) { | |
834 | if (num_req == 0) /* If we haven't started yet... */ | |
835 | break; | |
836 | max_req = 0; | |
837 | } | |
838 | ||
839 | /* Send some more requests */ | |
840 | while (num_req < max_req) { | |
841 | debug3("Request range %llu -> %llu (%d/%d)", | |
842 | (unsigned long long)offset, | |
843 | (unsigned long long)offset + buflen - 1, | |
844 | num_req, max_req); | |
845 | req = xmalloc(sizeof(*req)); | |
846 | req->id = conn->msg_id++; | |
847 | req->len = buflen; | |
848 | req->offset = offset; | |
849 | offset += buflen; | |
850 | num_req++; | |
851 | TAILQ_INSERT_TAIL(&requests, req, tq); | |
852 | send_read_request(conn->fd_out, req->id, req->offset, | |
853 | req->len, handle, handle_len); | |
854 | } | |
855 | ||
856 | buffer_clear(&msg); | |
857 | get_msg(conn->fd_in, &msg); | |
858 | type = buffer_get_char(&msg); | |
859 | id = buffer_get_int(&msg); | |
860 | debug3("Received reply T:%u I:%u R:%d", type, id, max_req); | |
861 | ||
862 | /* Find the request in our queue */ | |
863 | for (req = TAILQ_FIRST(&requests); | |
864 | req != NULL && req->id != id; | |
865 | req = TAILQ_NEXT(req, tq)) | |
866 | ; | |
867 | if (req == NULL) | |
868 | fatal("Unexpected reply %u", id); | |
869 | ||
870 | switch (type) { | |
871 | case SSH2_FXP_STATUS: | |
872 | status = buffer_get_int(&msg); | |
873 | if (status != SSH2_FX_EOF) | |
874 | read_error = 1; | |
875 | max_req = 0; | |
876 | TAILQ_REMOVE(&requests, req, tq); | |
877 | xfree(req); | |
878 | num_req--; | |
879 | break; | |
880 | case SSH2_FXP_DATA: | |
881 | data = buffer_get_string(&msg, &len); | |
882 | debug3("Received data %llu -> %llu", | |
883 | (unsigned long long)req->offset, | |
884 | (unsigned long long)req->offset + len - 1); | |
885 | if (len > req->len) | |
886 | fatal("Received more data than asked for " | |
887 | "%u > %u", len, req->len); | |
888 | if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || | |
889 | atomicio(vwrite, local_fd, data, len) != len) && | |
890 | !write_error) { | |
891 | write_errno = errno; | |
892 | write_error = 1; | |
893 | max_req = 0; | |
894 | } | |
895 | progress_counter += len; | |
896 | xfree(data); | |
897 | ||
898 | if (len == req->len) { | |
899 | TAILQ_REMOVE(&requests, req, tq); | |
900 | xfree(req); | |
901 | num_req--; | |
902 | } else { | |
903 | /* Resend the request for the missing data */ | |
904 | debug3("Short data block, re-requesting " | |
905 | "%llu -> %llu (%2d)", | |
906 | (unsigned long long)req->offset + len, | |
907 | (unsigned long long)req->offset + | |
908 | req->len - 1, num_req); | |
909 | req->id = conn->msg_id++; | |
910 | req->len -= len; | |
911 | req->offset += len; | |
912 | send_read_request(conn->fd_out, req->id, | |
913 | req->offset, req->len, handle, handle_len); | |
914 | /* Reduce the request size */ | |
915 | if (len < buflen) | |
916 | buflen = MAX(MIN_READ_SIZE, len); | |
917 | } | |
918 | if (max_req > 0) { /* max_req = 0 iff EOF received */ | |
919 | if (size > 0 && offset > size) { | |
920 | /* Only one request at a time | |
921 | * after the expected EOF */ | |
922 | debug3("Finish at %llu (%2d)", | |
923 | (unsigned long long)offset, | |
924 | num_req); | |
925 | max_req = 1; | |
926 | } else if (max_req <= conn->num_requests) { | |
927 | ++max_req; | |
928 | } | |
929 | } | |
930 | break; | |
931 | default: | |
932 | fatal("Expected SSH2_FXP_DATA(%u) packet, got %u", | |
933 | SSH2_FXP_DATA, type); | |
934 | } | |
935 | } | |
936 | ||
937 | if (showprogress && size) | |
938 | stop_progress_meter(); | |
939 | ||
940 | /* Sanity check */ | |
941 | if (TAILQ_FIRST(&requests) != NULL) | |
942 | fatal("Transfer complete, but requests still in queue"); | |
943 | ||
944 | if (read_error) { | |
945 | error("Couldn't read from remote file \"%s\" : %s", | |
946 | remote_path, fx2txt(status)); | |
947 | do_close(conn, handle, handle_len); | |
948 | } else if (write_error) { | |
949 | error("Couldn't write to \"%s\": %s", local_path, | |
950 | strerror(write_errno)); | |
951 | status = -1; | |
952 | do_close(conn, handle, handle_len); | |
953 | } else { | |
954 | status = do_close(conn, handle, handle_len); | |
955 | ||
956 | /* Override umask and utimes if asked */ | |
957 | #ifdef HAVE_FCHMOD | |
958 | if (pflag && fchmod(local_fd, mode) == -1) | |
959 | #else | |
960 | if (pflag && chmod(local_path, mode) == -1) | |
961 | #endif /* HAVE_FCHMOD */ | |
962 | error("Couldn't set mode on \"%s\": %s", local_path, | |
963 | strerror(errno)); | |
964 | if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { | |
965 | struct timeval tv[2]; | |
966 | tv[0].tv_sec = a->atime; | |
967 | tv[1].tv_sec = a->mtime; | |
968 | tv[0].tv_usec = tv[1].tv_usec = 0; | |
969 | if (utimes(local_path, tv) == -1) | |
970 | error("Can't set times on \"%s\": %s", | |
971 | local_path, strerror(errno)); | |
972 | } | |
973 | } | |
974 | close(local_fd); | |
975 | buffer_free(&msg); | |
976 | xfree(handle); | |
977 | ||
978 | return(status); | |
979 | } | |
980 | ||
981 | int | |
982 | do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, | |
983 | int pflag) | |
984 | { | |
985 | int local_fd, status; | |
986 | u_int handle_len, id, type; | |
987 | u_int64_t offset; | |
988 | char *handle, *data; | |
989 | Buffer msg; | |
990 | struct stat sb; | |
991 | Attrib a; | |
992 | u_int32_t startid; | |
993 | u_int32_t ackid; | |
994 | struct outstanding_ack { | |
995 | u_int id; | |
996 | u_int len; | |
997 | u_int64_t offset; | |
998 | TAILQ_ENTRY(outstanding_ack) tq; | |
999 | }; | |
1000 | TAILQ_HEAD(ackhead, outstanding_ack) acks; | |
1001 | struct outstanding_ack *ack = NULL; | |
1002 | ||
1003 | TAILQ_INIT(&acks); | |
1004 | ||
1005 | if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { | |
1006 | error("Couldn't open local file \"%s\" for reading: %s", | |
1007 | local_path, strerror(errno)); | |
1008 | return(-1); | |
1009 | } | |
1010 | if (fstat(local_fd, &sb) == -1) { | |
1011 | error("Couldn't fstat local file \"%s\": %s", | |
1012 | local_path, strerror(errno)); | |
1013 | close(local_fd); | |
1014 | return(-1); | |
1015 | } | |
1016 | if (!S_ISREG(sb.st_mode)) { | |
1017 | error("%s is not a regular file", local_path); | |
1018 | close(local_fd); | |
1019 | return(-1); | |
1020 | } | |
1021 | stat_to_attrib(&sb, &a); | |
1022 | ||
1023 | a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; | |
1024 | a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; | |
1025 | a.perm &= 0777; | |
1026 | if (!pflag) | |
1027 | a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; | |
1028 | ||
1029 | buffer_init(&msg); | |
1030 | ||
1031 | /* Send open request */ | |
1032 | id = conn->msg_id++; | |
1033 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
1034 | buffer_put_int(&msg, id); | |
1035 | buffer_put_cstring(&msg, remote_path); | |
1036 | buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); | |
1037 | encode_attrib(&msg, &a); | |
1038 | send_msg(conn->fd_out, &msg); | |
1039 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
1040 | ||
1041 | buffer_clear(&msg); | |
1042 | ||
1043 | handle = get_handle(conn->fd_in, id, &handle_len); | |
1044 | if (handle == NULL) { | |
1045 | close(local_fd); | |
1046 | buffer_free(&msg); | |
1047 | return(-1); | |
1048 | } | |
1049 | ||
1050 | startid = ackid = id + 1; | |
1051 | data = xmalloc(conn->transfer_buflen); | |
1052 | ||
1053 | /* Read from local and write to remote */ | |
1054 | offset = 0; | |
1055 | if (showprogress) | |
1056 | start_progress_meter(local_path, sb.st_size, &offset); | |
1057 | ||
1058 | for (;;) { | |
1059 | int len; | |
1060 | ||
1061 | /* | |
1062 | * Can't use atomicio here because it returns 0 on EOF, | |
1063 | * thus losing the last block of the file. | |
1064 | * Simulate an EOF on interrupt, allowing ACKs from the | |
1065 | * server to drain. | |
1066 | */ | |
1067 | if (interrupted) | |
1068 | len = 0; | |
1069 | else do | |
1070 | len = read(local_fd, data, conn->transfer_buflen); | |
1071 | while ((len == -1) && (errno == EINTR || errno == EAGAIN)); | |
1072 | ||
1073 | if (len == -1) | |
1074 | fatal("Couldn't read from \"%s\": %s", local_path, | |
1075 | strerror(errno)); | |
1076 | ||
1077 | if (len != 0) { | |
1078 | ack = xmalloc(sizeof(*ack)); | |
1079 | ack->id = ++id; | |
1080 | ack->offset = offset; | |
1081 | ack->len = len; | |
1082 | TAILQ_INSERT_TAIL(&acks, ack, tq); | |
1083 | ||
1084 | buffer_clear(&msg); | |
1085 | buffer_put_char(&msg, SSH2_FXP_WRITE); | |
1086 | buffer_put_int(&msg, ack->id); | |
1087 | buffer_put_string(&msg, handle, handle_len); | |
1088 | buffer_put_int64(&msg, offset); | |
1089 | buffer_put_string(&msg, data, len); | |
1090 | send_msg(conn->fd_out, &msg); | |
1091 | debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u", | |
1092 | id, (unsigned long long)offset, len); | |
1093 | } else if (TAILQ_FIRST(&acks) == NULL) | |
1094 | break; | |
1095 | ||
1096 | if (ack == NULL) | |
1097 | fatal("Unexpected ACK %u", id); | |
1098 | ||
1099 | if (id == startid || len == 0 || | |
1100 | id - ackid >= conn->num_requests) { | |
1101 | u_int r_id; | |
1102 | ||
1103 | buffer_clear(&msg); | |
1104 | get_msg(conn->fd_in, &msg); | |
1105 | type = buffer_get_char(&msg); | |
1106 | r_id = buffer_get_int(&msg); | |
1107 | ||
1108 | if (type != SSH2_FXP_STATUS) | |
1109 | fatal("Expected SSH2_FXP_STATUS(%d) packet, " | |
1110 | "got %d", SSH2_FXP_STATUS, type); | |
1111 | ||
1112 | status = buffer_get_int(&msg); | |
1113 | debug3("SSH2_FXP_STATUS %d", status); | |
1114 | ||
1115 | /* Find the request in our queue */ | |
1116 | for (ack = TAILQ_FIRST(&acks); | |
1117 | ack != NULL && ack->id != r_id; | |
1118 | ack = TAILQ_NEXT(ack, tq)) | |
1119 | ; | |
1120 | if (ack == NULL) | |
1121 | fatal("Can't find request for ID %u", r_id); | |
1122 | TAILQ_REMOVE(&acks, ack, tq); | |
1123 | ||
1124 | if (status != SSH2_FX_OK) { | |
1125 | error("Couldn't write to remote file \"%s\": %s", | |
1126 | remote_path, fx2txt(status)); | |
1127 | do_close(conn, handle, handle_len); | |
1128 | close(local_fd); | |
1129 | xfree(data); | |
1130 | xfree(ack); | |
1131 | goto done; | |
1132 | } | |
1133 | debug3("In write loop, ack for %u %u bytes at %llu", | |
1134 | ack->id, ack->len, (unsigned long long)ack->offset); | |
1135 | ++ackid; | |
1136 | xfree(ack); | |
1137 | } | |
1138 | offset += len; | |
1139 | } | |
1140 | if (showprogress) | |
1141 | stop_progress_meter(); | |
1142 | xfree(data); | |
1143 | ||
1144 | if (close(local_fd) == -1) { | |
1145 | error("Couldn't close local file \"%s\": %s", local_path, | |
1146 | strerror(errno)); | |
1147 | do_close(conn, handle, handle_len); | |
1148 | status = -1; | |
1149 | goto done; | |
1150 | } | |
1151 | ||
1152 | /* Override umask and utimes if asked */ | |
1153 | if (pflag) | |
1154 | do_fsetstat(conn, handle, handle_len, &a); | |
1155 | ||
1156 | status = do_close(conn, handle, handle_len); | |
1157 | ||
1158 | done: | |
1159 | xfree(handle); | |
1160 | buffer_free(&msg); | |
1161 | return(status); | |
1162 | } |