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1 | /* | |
2 | * Copyright (c) 2001-2004 Damien Miller <djm@openbsd.org> | |
3 | * | |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | ||
17 | /* XXX: memleaks */ | |
18 | /* XXX: signed vs unsigned */ | |
19 | /* XXX: remove all logging, only return status codes */ | |
20 | /* XXX: copy between two remote sites */ | |
21 | ||
22 | #include "includes.h" | |
23 | RCSID("$OpenBSD: sftp-client.c,v 1.54 2005/05/24 17:32:44 avsm Exp $"); | |
24 | ||
25 | #include "openbsd-compat/sys-queue.h" | |
26 | ||
27 | #include "buffer.h" | |
28 | #include "bufaux.h" | |
29 | #include "getput.h" | |
30 | #include "xmalloc.h" | |
31 | #include "log.h" | |
32 | #include "atomicio.h" | |
33 | #include "progressmeter.h" | |
34 | ||
35 | #include "sftp.h" | |
36 | #include "sftp-common.h" | |
37 | #include "sftp-client.h" | |
38 | ||
39 | extern volatile sig_atomic_t interrupted; | |
40 | extern int showprogress; | |
41 | ||
42 | /* Minimum amount of data to read at at time */ | |
43 | #define MIN_READ_SIZE 512 | |
44 | ||
45 | /* Maximum packet size */ | |
46 | #define MAX_MSG_LENGTH (256 * 1024) | |
47 | ||
48 | struct sftp_conn { | |
49 | int fd_in; | |
50 | int fd_out; | |
51 | u_int transfer_buflen; | |
52 | u_int num_requests; | |
53 | u_int version; | |
54 | u_int msg_id; | |
55 | }; | |
56 | ||
57 | static void | |
58 | send_msg(int fd, Buffer *m) | |
59 | { | |
60 | u_char mlen[4]; | |
61 | ||
62 | if (buffer_len(m) > MAX_MSG_LENGTH) | |
63 | fatal("Outbound message too long %u", buffer_len(m)); | |
64 | ||
65 | /* Send length first */ | |
66 | PUT_32BIT(mlen, buffer_len(m)); | |
67 | if (atomicio(vwrite, fd, mlen, sizeof(mlen)) != sizeof(mlen)) | |
68 | fatal("Couldn't send packet: %s", strerror(errno)); | |
69 | ||
70 | if (atomicio(vwrite, fd, buffer_ptr(m), buffer_len(m)) != buffer_len(m)) | |
71 | fatal("Couldn't send packet: %s", strerror(errno)); | |
72 | ||
73 | buffer_clear(m); | |
74 | } | |
75 | ||
76 | static void | |
77 | get_msg(int fd, Buffer *m) | |
78 | { | |
79 | u_int msg_len; | |
80 | ||
81 | buffer_append_space(m, 4); | |
82 | if (atomicio(read, fd, buffer_ptr(m), 4) != 4) { | |
83 | if (errno == EPIPE) | |
84 | fatal("Connection closed"); | |
85 | else | |
86 | fatal("Couldn't read packet: %s", strerror(errno)); | |
87 | } | |
88 | ||
89 | msg_len = buffer_get_int(m); | |
90 | if (msg_len > MAX_MSG_LENGTH) | |
91 | fatal("Received message too long %u", msg_len); | |
92 | ||
93 | buffer_append_space(m, msg_len); | |
94 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { | |
95 | if (errno == EPIPE) | |
96 | fatal("Connection closed"); | |
97 | else | |
98 | fatal("Read packet: %s", strerror(errno)); | |
99 | } | |
100 | } | |
101 | ||
102 | static void | |
103 | send_string_request(int fd, u_int id, u_int code, char *s, | |
104 | u_int len) | |
105 | { | |
106 | Buffer msg; | |
107 | ||
108 | buffer_init(&msg); | |
109 | buffer_put_char(&msg, code); | |
110 | buffer_put_int(&msg, id); | |
111 | buffer_put_string(&msg, s, len); | |
112 | send_msg(fd, &msg); | |
113 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
114 | buffer_free(&msg); | |
115 | } | |
116 | ||
117 | static void | |
118 | send_string_attrs_request(int fd, u_int id, u_int code, char *s, | |
119 | u_int len, Attrib *a) | |
120 | { | |
121 | Buffer msg; | |
122 | ||
123 | buffer_init(&msg); | |
124 | buffer_put_char(&msg, code); | |
125 | buffer_put_int(&msg, id); | |
126 | buffer_put_string(&msg, s, len); | |
127 | encode_attrib(&msg, a); | |
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 u_int | |
134 | get_status(int fd, u_int expected_id) | |
135 | { | |
136 | Buffer msg; | |
137 | u_int type, id, status; | |
138 | ||
139 | buffer_init(&msg); | |
140 | get_msg(fd, &msg); | |
141 | type = buffer_get_char(&msg); | |
142 | id = buffer_get_int(&msg); | |
143 | ||
144 | if (id != expected_id) | |
145 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
146 | if (type != SSH2_FXP_STATUS) | |
147 | fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u", | |
148 | SSH2_FXP_STATUS, type); | |
149 | ||
150 | status = buffer_get_int(&msg); | |
151 | buffer_free(&msg); | |
152 | ||
153 | debug3("SSH2_FXP_STATUS %u", status); | |
154 | ||
155 | return(status); | |
156 | } | |
157 | ||
158 | static char * | |
159 | get_handle(int fd, u_int expected_id, u_int *len) | |
160 | { | |
161 | Buffer msg; | |
162 | u_int type, id; | |
163 | char *handle; | |
164 | ||
165 | buffer_init(&msg); | |
166 | get_msg(fd, &msg); | |
167 | type = buffer_get_char(&msg); | |
168 | id = buffer_get_int(&msg); | |
169 | ||
170 | if (id != expected_id) | |
171 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
172 | if (type == SSH2_FXP_STATUS) { | |
173 | int status = buffer_get_int(&msg); | |
174 | ||
175 | error("Couldn't get handle: %s", fx2txt(status)); | |
176 | buffer_free(&msg); | |
177 | return(NULL); | |
178 | } else if (type != SSH2_FXP_HANDLE) | |
179 | fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u", | |
180 | SSH2_FXP_HANDLE, type); | |
181 | ||
182 | handle = buffer_get_string(&msg, len); | |
183 | buffer_free(&msg); | |
184 | ||
185 | return(handle); | |
186 | } | |
187 | ||
188 | static Attrib * | |
189 | get_decode_stat(int fd, u_int expected_id, int quiet) | |
190 | { | |
191 | Buffer msg; | |
192 | u_int type, id; | |
193 | Attrib *a; | |
194 | ||
195 | buffer_init(&msg); | |
196 | get_msg(fd, &msg); | |
197 | ||
198 | type = buffer_get_char(&msg); | |
199 | id = buffer_get_int(&msg); | |
200 | ||
201 | debug3("Received stat reply T:%u I:%u", type, id); | |
202 | if (id != expected_id) | |
203 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
204 | if (type == SSH2_FXP_STATUS) { | |
205 | int status = buffer_get_int(&msg); | |
206 | ||
207 | if (quiet) | |
208 | debug("Couldn't stat remote file: %s", fx2txt(status)); | |
209 | else | |
210 | error("Couldn't stat remote file: %s", fx2txt(status)); | |
211 | buffer_free(&msg); | |
212 | return(NULL); | |
213 | } else if (type != SSH2_FXP_ATTRS) { | |
214 | fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u", | |
215 | SSH2_FXP_ATTRS, type); | |
216 | } | |
217 | a = decode_attrib(&msg); | |
218 | buffer_free(&msg); | |
219 | ||
220 | return(a); | |
221 | } | |
222 | ||
223 | struct sftp_conn * | |
224 | do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) | |
225 | { | |
226 | u_int type; | |
227 | int version; | |
228 | Buffer msg; | |
229 | struct sftp_conn *ret; | |
230 | ||
231 | buffer_init(&msg); | |
232 | buffer_put_char(&msg, SSH2_FXP_INIT); | |
233 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
234 | send_msg(fd_out, &msg); | |
235 | ||
236 | buffer_clear(&msg); | |
237 | ||
238 | get_msg(fd_in, &msg); | |
239 | ||
240 | /* Expecting a VERSION reply */ | |
241 | if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { | |
242 | error("Invalid packet back from SSH2_FXP_INIT (type %u)", | |
243 | type); | |
244 | buffer_free(&msg); | |
245 | return(NULL); | |
246 | } | |
247 | version = buffer_get_int(&msg); | |
248 | ||
249 | debug2("Remote version: %d", version); | |
250 | ||
251 | /* Check for extensions */ | |
252 | while (buffer_len(&msg) > 0) { | |
253 | char *name = buffer_get_string(&msg, NULL); | |
254 | char *value = buffer_get_string(&msg, NULL); | |
255 | ||
256 | debug2("Init extension: \"%s\"", name); | |
257 | xfree(name); | |
258 | xfree(value); | |
259 | } | |
260 | ||
261 | buffer_free(&msg); | |
262 | ||
263 | ret = xmalloc(sizeof(*ret)); | |
264 | ret->fd_in = fd_in; | |
265 | ret->fd_out = fd_out; | |
266 | ret->transfer_buflen = transfer_buflen; | |
267 | ret->num_requests = num_requests; | |
268 | ret->version = version; | |
269 | ret->msg_id = 1; | |
270 | ||
271 | /* Some filexfer v.0 servers don't support large packets */ | |
272 | if (version == 0) | |
273 | ret->transfer_buflen = MIN(ret->transfer_buflen, 20480); | |
274 | ||
275 | return(ret); | |
276 | } | |
277 | ||
278 | u_int | |
279 | sftp_proto_version(struct sftp_conn *conn) | |
280 | { | |
281 | return(conn->version); | |
282 | } | |
283 | ||
284 | int | |
285 | do_close(struct sftp_conn *conn, char *handle, u_int handle_len) | |
286 | { | |
287 | u_int id, status; | |
288 | Buffer msg; | |
289 | ||
290 | buffer_init(&msg); | |
291 | ||
292 | id = conn->msg_id++; | |
293 | buffer_put_char(&msg, SSH2_FXP_CLOSE); | |
294 | buffer_put_int(&msg, id); | |
295 | buffer_put_string(&msg, handle, handle_len); | |
296 | send_msg(conn->fd_out, &msg); | |
297 | debug3("Sent message SSH2_FXP_CLOSE I:%u", id); | |
298 | ||
299 | status = get_status(conn->fd_in, id); | |
300 | if (status != SSH2_FX_OK) | |
301 | error("Couldn't close file: %s", fx2txt(status)); | |
302 | ||
303 | buffer_free(&msg); | |
304 | ||
305 | return(status); | |
306 | } | |
307 | ||
308 | ||
309 | static int | |
310 | do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, | |
311 | SFTP_DIRENT ***dir) | |
312 | { | |
313 | Buffer msg; | |
314 | u_int type, id, handle_len, i, expected_id, ents = 0; | |
315 | char *handle; | |
316 | ||
317 | id = conn->msg_id++; | |
318 | ||
319 | buffer_init(&msg); | |
320 | buffer_put_char(&msg, SSH2_FXP_OPENDIR); | |
321 | buffer_put_int(&msg, id); | |
322 | buffer_put_cstring(&msg, path); | |
323 | send_msg(conn->fd_out, &msg); | |
324 | ||
325 | buffer_clear(&msg); | |
326 | ||
327 | handle = get_handle(conn->fd_in, id, &handle_len); | |
328 | if (handle == NULL) | |
329 | return(-1); | |
330 | ||
331 | if (dir) { | |
332 | ents = 0; | |
333 | *dir = xmalloc(sizeof(**dir)); | |
334 | (*dir)[0] = NULL; | |
335 | } | |
336 | ||
337 | for (; !interrupted;) { | |
338 | int count; | |
339 | ||
340 | id = expected_id = conn->msg_id++; | |
341 | ||
342 | debug3("Sending SSH2_FXP_READDIR I:%u", id); | |
343 | ||
344 | buffer_clear(&msg); | |
345 | buffer_put_char(&msg, SSH2_FXP_READDIR); | |
346 | buffer_put_int(&msg, id); | |
347 | buffer_put_string(&msg, handle, handle_len); | |
348 | send_msg(conn->fd_out, &msg); | |
349 | ||
350 | buffer_clear(&msg); | |
351 | ||
352 | get_msg(conn->fd_in, &msg); | |
353 | ||
354 | type = buffer_get_char(&msg); | |
355 | id = buffer_get_int(&msg); | |
356 | ||
357 | debug3("Received reply T:%u I:%u", type, id); | |
358 | ||
359 | if (id != expected_id) | |
360 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
361 | ||
362 | if (type == SSH2_FXP_STATUS) { | |
363 | int status = buffer_get_int(&msg); | |
364 | ||
365 | debug3("Received SSH2_FXP_STATUS %d", status); | |
366 | ||
367 | if (status == SSH2_FX_EOF) { | |
368 | break; | |
369 | } else { | |
370 | error("Couldn't read directory: %s", | |
371 | fx2txt(status)); | |
372 | do_close(conn, handle, handle_len); | |
373 | xfree(handle); | |
374 | return(status); | |
375 | } | |
376 | } else if (type != SSH2_FXP_NAME) | |
377 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
378 | SSH2_FXP_NAME, type); | |
379 | ||
380 | count = buffer_get_int(&msg); | |
381 | if (count == 0) | |
382 | break; | |
383 | debug3("Received %d SSH2_FXP_NAME responses", count); | |
384 | for (i = 0; i < count; i++) { | |
385 | char *filename, *longname; | |
386 | Attrib *a; | |
387 | ||
388 | filename = buffer_get_string(&msg, NULL); | |
389 | longname = buffer_get_string(&msg, NULL); | |
390 | a = decode_attrib(&msg); | |
391 | ||
392 | if (printflag) | |
393 | printf("%s\n", longname); | |
394 | ||
395 | if (dir) { | |
396 | *dir = xrealloc(*dir, sizeof(**dir) * | |
397 | (ents + 2)); | |
398 | (*dir)[ents] = xmalloc(sizeof(***dir)); | |
399 | (*dir)[ents]->filename = xstrdup(filename); | |
400 | (*dir)[ents]->longname = xstrdup(longname); | |
401 | memcpy(&(*dir)[ents]->a, a, sizeof(*a)); | |
402 | (*dir)[++ents] = NULL; | |
403 | } | |
404 | ||
405 | xfree(filename); | |
406 | xfree(longname); | |
407 | } | |
408 | } | |
409 | ||
410 | buffer_free(&msg); | |
411 | do_close(conn, handle, handle_len); | |
412 | xfree(handle); | |
413 | ||
414 | /* Don't return partial matches on interrupt */ | |
415 | if (interrupted && dir != NULL && *dir != NULL) { | |
416 | free_sftp_dirents(*dir); | |
417 | *dir = xmalloc(sizeof(**dir)); | |
418 | **dir = NULL; | |
419 | } | |
420 | ||
421 | return(0); | |
422 | } | |
423 | ||
424 | int | |
425 | do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) | |
426 | { | |
427 | return(do_lsreaddir(conn, path, 0, dir)); | |
428 | } | |
429 | ||
430 | void free_sftp_dirents(SFTP_DIRENT **s) | |
431 | { | |
432 | int i; | |
433 | ||
434 | for (i = 0; s[i]; i++) { | |
435 | xfree(s[i]->filename); | |
436 | xfree(s[i]->longname); | |
437 | xfree(s[i]); | |
438 | } | |
439 | xfree(s); | |
440 | } | |
441 | ||
442 | int | |
443 | do_rm(struct sftp_conn *conn, char *path) | |
444 | { | |
445 | u_int status, id; | |
446 | ||
447 | debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); | |
448 | ||
449 | id = conn->msg_id++; | |
450 | send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, | |
451 | strlen(path)); | |
452 | status = get_status(conn->fd_in, id); | |
453 | if (status != SSH2_FX_OK) | |
454 | error("Couldn't delete file: %s", fx2txt(status)); | |
455 | return(status); | |
456 | } | |
457 | ||
458 | int | |
459 | do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) | |
460 | { | |
461 | u_int status, id; | |
462 | ||
463 | id = conn->msg_id++; | |
464 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, | |
465 | strlen(path), a); | |
466 | ||
467 | status = get_status(conn->fd_in, id); | |
468 | if (status != SSH2_FX_OK) | |
469 | error("Couldn't create directory: %s", fx2txt(status)); | |
470 | ||
471 | return(status); | |
472 | } | |
473 | ||
474 | int | |
475 | do_rmdir(struct sftp_conn *conn, char *path) | |
476 | { | |
477 | u_int status, id; | |
478 | ||
479 | id = conn->msg_id++; | |
480 | send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, | |
481 | strlen(path)); | |
482 | ||
483 | status = get_status(conn->fd_in, id); | |
484 | if (status != SSH2_FX_OK) | |
485 | error("Couldn't remove directory: %s", fx2txt(status)); | |
486 | ||
487 | return(status); | |
488 | } | |
489 | ||
490 | Attrib * | |
491 | do_stat(struct sftp_conn *conn, char *path, int quiet) | |
492 | { | |
493 | u_int id; | |
494 | ||
495 | id = conn->msg_id++; | |
496 | ||
497 | send_string_request(conn->fd_out, id, | |
498 | conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, | |
499 | path, strlen(path)); | |
500 | ||
501 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
502 | } | |
503 | ||
504 | Attrib * | |
505 | do_lstat(struct sftp_conn *conn, char *path, int quiet) | |
506 | { | |
507 | u_int id; | |
508 | ||
509 | if (conn->version == 0) { | |
510 | if (quiet) | |
511 | debug("Server version does not support lstat operation"); | |
512 | else | |
513 | logit("Server version does not support lstat operation"); | |
514 | return(do_stat(conn, path, quiet)); | |
515 | } | |
516 | ||
517 | id = conn->msg_id++; | |
518 | send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, | |
519 | strlen(path)); | |
520 | ||
521 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
522 | } | |
523 | ||
524 | Attrib * | |
525 | do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) | |
526 | { | |
527 | u_int id; | |
528 | ||
529 | id = conn->msg_id++; | |
530 | send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, | |
531 | handle_len); | |
532 | ||
533 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
534 | } | |
535 | ||
536 | int | |
537 | do_setstat(struct sftp_conn *conn, char *path, Attrib *a) | |
538 | { | |
539 | u_int status, id; | |
540 | ||
541 | id = conn->msg_id++; | |
542 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, | |
543 | strlen(path), a); | |
544 | ||
545 | status = get_status(conn->fd_in, id); | |
546 | if (status != SSH2_FX_OK) | |
547 | error("Couldn't setstat on \"%s\": %s", path, | |
548 | fx2txt(status)); | |
549 | ||
550 | return(status); | |
551 | } | |
552 | ||
553 | int | |
554 | do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, | |
555 | Attrib *a) | |
556 | { | |
557 | u_int status, id; | |
558 | ||
559 | id = conn->msg_id++; | |
560 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, | |
561 | handle_len, a); | |
562 | ||
563 | status = get_status(conn->fd_in, id); | |
564 | if (status != SSH2_FX_OK) | |
565 | error("Couldn't fsetstat: %s", fx2txt(status)); | |
566 | ||
567 | return(status); | |
568 | } | |
569 | ||
570 | char * | |
571 | do_realpath(struct sftp_conn *conn, char *path) | |
572 | { | |
573 | Buffer msg; | |
574 | u_int type, expected_id, count, id; | |
575 | char *filename, *longname; | |
576 | Attrib *a; | |
577 | ||
578 | expected_id = id = conn->msg_id++; | |
579 | send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, | |
580 | strlen(path)); | |
581 | ||
582 | buffer_init(&msg); | |
583 | ||
584 | get_msg(conn->fd_in, &msg); | |
585 | type = buffer_get_char(&msg); | |
586 | id = buffer_get_int(&msg); | |
587 | ||
588 | if (id != expected_id) | |
589 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
590 | ||
591 | if (type == SSH2_FXP_STATUS) { | |
592 | u_int status = buffer_get_int(&msg); | |
593 | ||
594 | error("Couldn't canonicalise: %s", fx2txt(status)); | |
595 | return(NULL); | |
596 | } else if (type != SSH2_FXP_NAME) | |
597 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
598 | SSH2_FXP_NAME, type); | |
599 | ||
600 | count = buffer_get_int(&msg); | |
601 | if (count != 1) | |
602 | fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); | |
603 | ||
604 | filename = buffer_get_string(&msg, NULL); | |
605 | longname = buffer_get_string(&msg, NULL); | |
606 | a = decode_attrib(&msg); | |
607 | ||
608 | debug3("SSH_FXP_REALPATH %s -> %s", path, filename); | |
609 | ||
610 | xfree(longname); | |
611 | ||
612 | buffer_free(&msg); | |
613 | ||
614 | return(filename); | |
615 | } | |
616 | ||
617 | int | |
618 | do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) | |
619 | { | |
620 | Buffer msg; | |
621 | u_int status, id; | |
622 | ||
623 | buffer_init(&msg); | |
624 | ||
625 | /* Send rename request */ | |
626 | id = conn->msg_id++; | |
627 | buffer_put_char(&msg, SSH2_FXP_RENAME); | |
628 | buffer_put_int(&msg, id); | |
629 | buffer_put_cstring(&msg, oldpath); | |
630 | buffer_put_cstring(&msg, newpath); | |
631 | send_msg(conn->fd_out, &msg); | |
632 | debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, | |
633 | newpath); | |
634 | buffer_free(&msg); | |
635 | ||
636 | status = get_status(conn->fd_in, id); | |
637 | if (status != SSH2_FX_OK) | |
638 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
639 | newpath, fx2txt(status)); | |
640 | ||
641 | return(status); | |
642 | } | |
643 | ||
644 | int | |
645 | do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) | |
646 | { | |
647 | Buffer msg; | |
648 | u_int status, id; | |
649 | ||
650 | if (conn->version < 3) { | |
651 | error("This server does not support the symlink operation"); | |
652 | return(SSH2_FX_OP_UNSUPPORTED); | |
653 | } | |
654 | ||
655 | buffer_init(&msg); | |
656 | ||
657 | /* Send symlink request */ | |
658 | id = conn->msg_id++; | |
659 | buffer_put_char(&msg, SSH2_FXP_SYMLINK); | |
660 | buffer_put_int(&msg, id); | |
661 | buffer_put_cstring(&msg, oldpath); | |
662 | buffer_put_cstring(&msg, newpath); | |
663 | send_msg(conn->fd_out, &msg); | |
664 | debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, | |
665 | newpath); | |
666 | buffer_free(&msg); | |
667 | ||
668 | status = get_status(conn->fd_in, id); | |
669 | if (status != SSH2_FX_OK) | |
670 | error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath, | |
671 | newpath, fx2txt(status)); | |
672 | ||
673 | return(status); | |
674 | } | |
675 | ||
676 | char * | |
677 | do_readlink(struct sftp_conn *conn, char *path) | |
678 | { | |
679 | Buffer msg; | |
680 | u_int type, expected_id, count, id; | |
681 | char *filename, *longname; | |
682 | Attrib *a; | |
683 | ||
684 | expected_id = id = conn->msg_id++; | |
685 | send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, | |
686 | strlen(path)); | |
687 | ||
688 | buffer_init(&msg); | |
689 | ||
690 | get_msg(conn->fd_in, &msg); | |
691 | type = buffer_get_char(&msg); | |
692 | id = buffer_get_int(&msg); | |
693 | ||
694 | if (id != expected_id) | |
695 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
696 | ||
697 | if (type == SSH2_FXP_STATUS) { | |
698 | u_int status = buffer_get_int(&msg); | |
699 | ||
700 | error("Couldn't readlink: %s", fx2txt(status)); | |
701 | return(NULL); | |
702 | } else if (type != SSH2_FXP_NAME) | |
703 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
704 | SSH2_FXP_NAME, type); | |
705 | ||
706 | count = buffer_get_int(&msg); | |
707 | if (count != 1) | |
708 | fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); | |
709 | ||
710 | filename = buffer_get_string(&msg, NULL); | |
711 | longname = buffer_get_string(&msg, NULL); | |
712 | a = decode_attrib(&msg); | |
713 | ||
714 | debug3("SSH_FXP_READLINK %s -> %s", path, filename); | |
715 | ||
716 | xfree(longname); | |
717 | ||
718 | buffer_free(&msg); | |
719 | ||
720 | return(filename); | |
721 | } | |
722 | ||
723 | static void | |
724 | send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, | |
725 | char *handle, u_int handle_len) | |
726 | { | |
727 | Buffer msg; | |
728 | ||
729 | buffer_init(&msg); | |
730 | buffer_clear(&msg); | |
731 | buffer_put_char(&msg, SSH2_FXP_READ); | |
732 | buffer_put_int(&msg, id); | |
733 | buffer_put_string(&msg, handle, handle_len); | |
734 | buffer_put_int64(&msg, offset); | |
735 | buffer_put_int(&msg, len); | |
736 | send_msg(fd_out, &msg); | |
737 | buffer_free(&msg); | |
738 | } | |
739 | ||
740 | int | |
741 | do_download(struct sftp_conn *conn, char *remote_path, char *local_path, | |
742 | int pflag) | |
743 | { | |
744 | Attrib junk, *a; | |
745 | Buffer msg; | |
746 | char *handle; | |
747 | int local_fd, status, num_req, max_req, write_error; | |
748 | int read_error, write_errno; | |
749 | u_int64_t offset, size; | |
750 | u_int handle_len, mode, type, id, buflen; | |
751 | off_t progress_counter; | |
752 | struct request { | |
753 | u_int id; | |
754 | u_int len; | |
755 | u_int64_t offset; | |
756 | TAILQ_ENTRY(request) tq; | |
757 | }; | |
758 | TAILQ_HEAD(reqhead, request) requests; | |
759 | struct request *req; | |
760 | ||
761 | TAILQ_INIT(&requests); | |
762 | ||
763 | a = do_stat(conn, remote_path, 0); | |
764 | if (a == NULL) | |
765 | return(-1); | |
766 | ||
767 | /* XXX: should we preserve set[ug]id? */ | |
768 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) | |
769 | mode = a->perm & 0777; | |
770 | else | |
771 | mode = 0666; | |
772 | ||
773 | if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && | |
774 | (!S_ISREG(a->perm))) { | |
775 | error("Cannot download non-regular file: %s", remote_path); | |
776 | return(-1); | |
777 | } | |
778 | ||
779 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) | |
780 | size = a->size; | |
781 | else | |
782 | size = 0; | |
783 | ||
784 | buflen = conn->transfer_buflen; | |
785 | buffer_init(&msg); | |
786 | ||
787 | /* Send open request */ | |
788 | id = conn->msg_id++; | |
789 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
790 | buffer_put_int(&msg, id); | |
791 | buffer_put_cstring(&msg, remote_path); | |
792 | buffer_put_int(&msg, SSH2_FXF_READ); | |
793 | attrib_clear(&junk); /* Send empty attributes */ | |
794 | encode_attrib(&msg, &junk); | |
795 | send_msg(conn->fd_out, &msg); | |
796 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
797 | ||
798 | handle = get_handle(conn->fd_in, id, &handle_len); | |
799 | if (handle == NULL) { | |
800 | buffer_free(&msg); | |
801 | return(-1); | |
802 | } | |
803 | ||
804 | local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, | |
805 | mode | S_IWRITE); | |
806 | if (local_fd == -1) { | |
807 | error("Couldn't open local file \"%s\" for writing: %s", | |
808 | local_path, strerror(errno)); | |
809 | buffer_free(&msg); | |
810 | xfree(handle); | |
811 | return(-1); | |
812 | } | |
813 | ||
814 | /* Read from remote and write to local */ | |
815 | write_error = read_error = write_errno = num_req = offset = 0; | |
816 | max_req = 1; | |
817 | progress_counter = 0; | |
818 | ||
819 | if (showprogress && size != 0) | |
820 | start_progress_meter(remote_path, size, &progress_counter); | |
821 | ||
822 | while (num_req > 0 || max_req > 0) { | |
823 | char *data; | |
824 | u_int len; | |
825 | ||
826 | /* | |
827 | * Simulate EOF on interrupt: stop sending new requests and | |
828 | * allow outstanding requests to drain gracefully | |
829 | */ | |
830 | if (interrupted) { | |
831 | if (num_req == 0) /* If we haven't started yet... */ | |
832 | break; | |
833 | max_req = 0; | |
834 | } | |
835 | ||
836 | /* Send some more requests */ | |
837 | while (num_req < max_req) { | |
838 | debug3("Request range %llu -> %llu (%d/%d)", | |
839 | (unsigned long long)offset, | |
840 | (unsigned long long)offset + buflen - 1, | |
841 | num_req, max_req); | |
842 | req = xmalloc(sizeof(*req)); | |
843 | req->id = conn->msg_id++; | |
844 | req->len = buflen; | |
845 | req->offset = offset; | |
846 | offset += buflen; | |
847 | num_req++; | |
848 | TAILQ_INSERT_TAIL(&requests, req, tq); | |
849 | send_read_request(conn->fd_out, req->id, req->offset, | |
850 | req->len, handle, handle_len); | |
851 | } | |
852 | ||
853 | buffer_clear(&msg); | |
854 | get_msg(conn->fd_in, &msg); | |
855 | type = buffer_get_char(&msg); | |
856 | id = buffer_get_int(&msg); | |
857 | debug3("Received reply T:%u I:%u R:%d", type, id, max_req); | |
858 | ||
859 | /* Find the request in our queue */ | |
860 | for (req = TAILQ_FIRST(&requests); | |
861 | req != NULL && req->id != id; | |
862 | req = TAILQ_NEXT(req, tq)) | |
863 | ; | |
864 | if (req == NULL) | |
865 | fatal("Unexpected reply %u", id); | |
866 | ||
867 | switch (type) { | |
868 | case SSH2_FXP_STATUS: | |
869 | status = buffer_get_int(&msg); | |
870 | if (status != SSH2_FX_EOF) | |
871 | read_error = 1; | |
872 | max_req = 0; | |
873 | TAILQ_REMOVE(&requests, req, tq); | |
874 | xfree(req); | |
875 | num_req--; | |
876 | break; | |
877 | case SSH2_FXP_DATA: | |
878 | data = buffer_get_string(&msg, &len); | |
879 | debug3("Received data %llu -> %llu", | |
880 | (unsigned long long)req->offset, | |
881 | (unsigned long long)req->offset + len - 1); | |
882 | if (len > req->len) | |
883 | fatal("Received more data than asked for " | |
884 | "%u > %u", len, req->len); | |
885 | if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || | |
886 | atomicio(vwrite, local_fd, data, len) != len) && | |
887 | !write_error) { | |
888 | write_errno = errno; | |
889 | write_error = 1; | |
890 | max_req = 0; | |
891 | } | |
892 | progress_counter += len; | |
893 | xfree(data); | |
894 | ||
895 | if (len == req->len) { | |
896 | TAILQ_REMOVE(&requests, req, tq); | |
897 | xfree(req); | |
898 | num_req--; | |
899 | } else { | |
900 | /* Resend the request for the missing data */ | |
901 | debug3("Short data block, re-requesting " | |
902 | "%llu -> %llu (%2d)", | |
903 | (unsigned long long)req->offset + len, | |
904 | (unsigned long long)req->offset + | |
905 | req->len - 1, num_req); | |
906 | req->id = conn->msg_id++; | |
907 | req->len -= len; | |
908 | req->offset += len; | |
909 | send_read_request(conn->fd_out, req->id, | |
910 | req->offset, req->len, handle, handle_len); | |
911 | /* Reduce the request size */ | |
912 | if (len < buflen) | |
913 | buflen = MAX(MIN_READ_SIZE, len); | |
914 | } | |
915 | if (max_req > 0) { /* max_req = 0 iff EOF received */ | |
916 | if (size > 0 && offset > size) { | |
917 | /* Only one request at a time | |
918 | * after the expected EOF */ | |
919 | debug3("Finish at %llu (%2d)", | |
920 | (unsigned long long)offset, | |
921 | num_req); | |
922 | max_req = 1; | |
923 | } else if (max_req <= conn->num_requests) { | |
924 | ++max_req; | |
925 | } | |
926 | } | |
927 | break; | |
928 | default: | |
929 | fatal("Expected SSH2_FXP_DATA(%u) packet, got %u", | |
930 | SSH2_FXP_DATA, type); | |
931 | } | |
932 | } | |
933 | ||
934 | if (showprogress && size) | |
935 | stop_progress_meter(); | |
936 | ||
937 | /* Sanity check */ | |
938 | if (TAILQ_FIRST(&requests) != NULL) | |
939 | fatal("Transfer complete, but requests still in queue"); | |
940 | ||
941 | if (read_error) { | |
942 | error("Couldn't read from remote file \"%s\" : %s", | |
943 | remote_path, fx2txt(status)); | |
944 | do_close(conn, handle, handle_len); | |
945 | } else if (write_error) { | |
946 | error("Couldn't write to \"%s\": %s", local_path, | |
947 | strerror(write_errno)); | |
948 | status = -1; | |
949 | do_close(conn, handle, handle_len); | |
950 | } else { | |
951 | status = do_close(conn, handle, handle_len); | |
952 | ||
953 | /* Override umask and utimes if asked */ | |
954 | #ifdef HAVE_FCHMOD | |
955 | if (pflag && fchmod(local_fd, mode) == -1) | |
956 | #else | |
957 | if (pflag && chmod(local_path, mode) == -1) | |
958 | #endif /* HAVE_FCHMOD */ | |
959 | error("Couldn't set mode on \"%s\": %s", local_path, | |
960 | strerror(errno)); | |
961 | if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { | |
962 | struct timeval tv[2]; | |
963 | tv[0].tv_sec = a->atime; | |
964 | tv[1].tv_sec = a->mtime; | |
965 | tv[0].tv_usec = tv[1].tv_usec = 0; | |
966 | if (utimes(local_path, tv) == -1) | |
967 | error("Can't set times on \"%s\": %s", | |
968 | local_path, strerror(errno)); | |
969 | } | |
970 | } | |
971 | close(local_fd); | |
972 | buffer_free(&msg); | |
973 | xfree(handle); | |
974 | ||
975 | return(status); | |
976 | } | |
977 | ||
978 | int | |
979 | do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, | |
980 | int pflag) | |
981 | { | |
982 | int local_fd, status; | |
983 | u_int handle_len, id, type; | |
984 | u_int64_t offset; | |
985 | char *handle, *data; | |
986 | Buffer msg; | |
987 | struct stat sb; | |
988 | Attrib a; | |
989 | u_int32_t startid; | |
990 | u_int32_t ackid; | |
991 | struct outstanding_ack { | |
992 | u_int id; | |
993 | u_int len; | |
994 | u_int64_t offset; | |
995 | TAILQ_ENTRY(outstanding_ack) tq; | |
996 | }; | |
997 | TAILQ_HEAD(ackhead, outstanding_ack) acks; | |
998 | struct outstanding_ack *ack = NULL; | |
999 | ||
1000 | TAILQ_INIT(&acks); | |
1001 | ||
1002 | if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { | |
1003 | error("Couldn't open local file \"%s\" for reading: %s", | |
1004 | local_path, strerror(errno)); | |
1005 | return(-1); | |
1006 | } | |
1007 | if (fstat(local_fd, &sb) == -1) { | |
1008 | error("Couldn't fstat local file \"%s\": %s", | |
1009 | local_path, strerror(errno)); | |
1010 | close(local_fd); | |
1011 | return(-1); | |
1012 | } | |
1013 | if (!S_ISREG(sb.st_mode)) { | |
1014 | error("%s is not a regular file", local_path); | |
1015 | close(local_fd); | |
1016 | return(-1); | |
1017 | } | |
1018 | stat_to_attrib(&sb, &a); | |
1019 | ||
1020 | a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; | |
1021 | a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; | |
1022 | a.perm &= 0777; | |
1023 | if (!pflag) | |
1024 | a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; | |
1025 | ||
1026 | buffer_init(&msg); | |
1027 | ||
1028 | /* Send open request */ | |
1029 | id = conn->msg_id++; | |
1030 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
1031 | buffer_put_int(&msg, id); | |
1032 | buffer_put_cstring(&msg, remote_path); | |
1033 | buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); | |
1034 | encode_attrib(&msg, &a); | |
1035 | send_msg(conn->fd_out, &msg); | |
1036 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
1037 | ||
1038 | buffer_clear(&msg); | |
1039 | ||
1040 | handle = get_handle(conn->fd_in, id, &handle_len); | |
1041 | if (handle == NULL) { | |
1042 | close(local_fd); | |
1043 | buffer_free(&msg); | |
1044 | return(-1); | |
1045 | } | |
1046 | ||
1047 | startid = ackid = id + 1; | |
1048 | data = xmalloc(conn->transfer_buflen); | |
1049 | ||
1050 | /* Read from local and write to remote */ | |
1051 | offset = 0; | |
1052 | if (showprogress) | |
1053 | start_progress_meter(local_path, sb.st_size, &offset); | |
1054 | ||
1055 | for (;;) { | |
1056 | int len; | |
1057 | ||
1058 | /* | |
1059 | * Can't use atomicio here because it returns 0 on EOF, | |
1060 | * thus losing the last block of the file. | |
1061 | * Simulate an EOF on interrupt, allowing ACKs from the | |
1062 | * server to drain. | |
1063 | */ | |
1064 | if (interrupted) | |
1065 | len = 0; | |
1066 | else do | |
1067 | len = read(local_fd, data, conn->transfer_buflen); | |
1068 | while ((len == -1) && (errno == EINTR || errno == EAGAIN)); | |
1069 | ||
1070 | if (len == -1) | |
1071 | fatal("Couldn't read from \"%s\": %s", local_path, | |
1072 | strerror(errno)); | |
1073 | ||
1074 | if (len != 0) { | |
1075 | ack = xmalloc(sizeof(*ack)); | |
1076 | ack->id = ++id; | |
1077 | ack->offset = offset; | |
1078 | ack->len = len; | |
1079 | TAILQ_INSERT_TAIL(&acks, ack, tq); | |
1080 | ||
1081 | buffer_clear(&msg); | |
1082 | buffer_put_char(&msg, SSH2_FXP_WRITE); | |
1083 | buffer_put_int(&msg, ack->id); | |
1084 | buffer_put_string(&msg, handle, handle_len); | |
1085 | buffer_put_int64(&msg, offset); | |
1086 | buffer_put_string(&msg, data, len); | |
1087 | send_msg(conn->fd_out, &msg); | |
1088 | debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u", | |
1089 | id, (unsigned long long)offset, len); | |
1090 | } else if (TAILQ_FIRST(&acks) == NULL) | |
1091 | break; | |
1092 | ||
1093 | if (ack == NULL) | |
1094 | fatal("Unexpected ACK %u", id); | |
1095 | ||
1096 | if (id == startid || len == 0 || | |
1097 | id - ackid >= conn->num_requests) { | |
1098 | u_int r_id; | |
1099 | ||
1100 | buffer_clear(&msg); | |
1101 | get_msg(conn->fd_in, &msg); | |
1102 | type = buffer_get_char(&msg); | |
1103 | r_id = buffer_get_int(&msg); | |
1104 | ||
1105 | if (type != SSH2_FXP_STATUS) | |
1106 | fatal("Expected SSH2_FXP_STATUS(%d) packet, " | |
1107 | "got %d", SSH2_FXP_STATUS, type); | |
1108 | ||
1109 | status = buffer_get_int(&msg); | |
1110 | debug3("SSH2_FXP_STATUS %d", status); | |
1111 | ||
1112 | /* Find the request in our queue */ | |
1113 | for (ack = TAILQ_FIRST(&acks); | |
1114 | ack != NULL && ack->id != r_id; | |
1115 | ack = TAILQ_NEXT(ack, tq)) | |
1116 | ; | |
1117 | if (ack == NULL) | |
1118 | fatal("Can't find request for ID %u", r_id); | |
1119 | TAILQ_REMOVE(&acks, ack, tq); | |
1120 | ||
1121 | if (status != SSH2_FX_OK) { | |
1122 | error("Couldn't write to remote file \"%s\": %s", | |
1123 | remote_path, fx2txt(status)); | |
1124 | do_close(conn, handle, handle_len); | |
1125 | close(local_fd); | |
1126 | xfree(data); | |
1127 | xfree(ack); | |
1128 | goto done; | |
1129 | } | |
1130 | debug3("In write loop, ack for %u %u bytes at %llu", | |
1131 | ack->id, ack->len, (unsigned long long)ack->offset); | |
1132 | ++ackid; | |
1133 | xfree(ack); | |
1134 | } | |
1135 | offset += len; | |
1136 | } | |
1137 | if (showprogress) | |
1138 | stop_progress_meter(); | |
1139 | xfree(data); | |
1140 | ||
1141 | if (close(local_fd) == -1) { | |
1142 | error("Couldn't close local file \"%s\": %s", local_path, | |
1143 | strerror(errno)); | |
1144 | do_close(conn, handle, handle_len); | |
1145 | status = -1; | |
1146 | goto done; | |
1147 | } | |
1148 | ||
1149 | /* Override umask and utimes if asked */ | |
1150 | if (pflag) | |
1151 | do_fsetstat(conn, handle, handle_len, &a); | |
1152 | ||
1153 | status = do_close(conn, handle, handle_len); | |
1154 | ||
1155 | done: | |
1156 | xfree(handle); | |
1157 | buffer_free(&msg); | |
1158 | return(status); | |
1159 | } |