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1 | /* $OpenBSD: sftp-client.c,v 1.68 2006/07/17 01:31:09 stevesk 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 | ||
30 | #include <errno.h> | |
31 | #include <fcntl.h> | |
32 | #include <signal.h> | |
33 | #include <unistd.h> | |
34 | ||
35 | #include "openbsd-compat/sys-queue.h" | |
36 | ||
37 | #include "buffer.h" | |
38 | #include "bufaux.h" | |
39 | #include "xmalloc.h" | |
40 | #include "log.h" | |
41 | #include "atomicio.h" | |
42 | #include "progressmeter.h" | |
43 | #include "misc.h" | |
44 | ||
45 | #include "sftp.h" | |
46 | #include "sftp-common.h" | |
47 | #include "sftp-client.h" | |
48 | ||
49 | extern volatile sig_atomic_t interrupted; | |
50 | extern int showprogress; | |
51 | ||
52 | /* Minimum amount of data to read at a time */ | |
53 | #define MIN_READ_SIZE 512 | |
54 | ||
55 | struct sftp_conn { | |
56 | int fd_in; | |
57 | int fd_out; | |
58 | u_int transfer_buflen; | |
59 | u_int num_requests; | |
60 | u_int version; | |
61 | u_int msg_id; | |
62 | }; | |
63 | ||
64 | static void | |
65 | send_msg(int fd, Buffer *m) | |
66 | { | |
67 | u_char mlen[4]; | |
68 | struct iovec iov[2]; | |
69 | ||
70 | if (buffer_len(m) > SFTP_MAX_MSG_LENGTH) | |
71 | fatal("Outbound message too long %u", buffer_len(m)); | |
72 | ||
73 | /* Send length first */ | |
74 | put_u32(mlen, buffer_len(m)); | |
75 | iov[0].iov_base = mlen; | |
76 | iov[0].iov_len = sizeof(mlen); | |
77 | iov[1].iov_base = buffer_ptr(m); | |
78 | iov[1].iov_len = buffer_len(m); | |
79 | ||
80 | if (atomiciov(writev, fd, iov, 2) != buffer_len(m) + sizeof(mlen)) | |
81 | fatal("Couldn't send packet: %s", strerror(errno)); | |
82 | ||
83 | buffer_clear(m); | |
84 | } | |
85 | ||
86 | static void | |
87 | get_msg(int fd, Buffer *m) | |
88 | { | |
89 | u_int msg_len; | |
90 | ||
91 | buffer_append_space(m, 4); | |
92 | if (atomicio(read, fd, buffer_ptr(m), 4) != 4) { | |
93 | if (errno == EPIPE) | |
94 | fatal("Connection closed"); | |
95 | else | |
96 | fatal("Couldn't read packet: %s", strerror(errno)); | |
97 | } | |
98 | ||
99 | msg_len = buffer_get_int(m); | |
100 | if (msg_len > SFTP_MAX_MSG_LENGTH) | |
101 | fatal("Received message too long %u", msg_len); | |
102 | ||
103 | buffer_append_space(m, msg_len); | |
104 | if (atomicio(read, fd, buffer_ptr(m), msg_len) != msg_len) { | |
105 | if (errno == EPIPE) | |
106 | fatal("Connection closed"); | |
107 | else | |
108 | fatal("Read packet: %s", strerror(errno)); | |
109 | } | |
110 | } | |
111 | ||
112 | static void | |
113 | send_string_request(int fd, u_int id, u_int code, char *s, | |
114 | u_int len) | |
115 | { | |
116 | Buffer msg; | |
117 | ||
118 | buffer_init(&msg); | |
119 | buffer_put_char(&msg, code); | |
120 | buffer_put_int(&msg, id); | |
121 | buffer_put_string(&msg, s, len); | |
122 | send_msg(fd, &msg); | |
123 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
124 | buffer_free(&msg); | |
125 | } | |
126 | ||
127 | static void | |
128 | send_string_attrs_request(int fd, u_int id, u_int code, char *s, | |
129 | u_int len, Attrib *a) | |
130 | { | |
131 | Buffer msg; | |
132 | ||
133 | buffer_init(&msg); | |
134 | buffer_put_char(&msg, code); | |
135 | buffer_put_int(&msg, id); | |
136 | buffer_put_string(&msg, s, len); | |
137 | encode_attrib(&msg, a); | |
138 | send_msg(fd, &msg); | |
139 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
140 | buffer_free(&msg); | |
141 | } | |
142 | ||
143 | static u_int | |
144 | get_status(int fd, u_int expected_id) | |
145 | { | |
146 | Buffer msg; | |
147 | u_int type, id, status; | |
148 | ||
149 | buffer_init(&msg); | |
150 | get_msg(fd, &msg); | |
151 | type = buffer_get_char(&msg); | |
152 | id = buffer_get_int(&msg); | |
153 | ||
154 | if (id != expected_id) | |
155 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
156 | if (type != SSH2_FXP_STATUS) | |
157 | fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u", | |
158 | SSH2_FXP_STATUS, type); | |
159 | ||
160 | status = buffer_get_int(&msg); | |
161 | buffer_free(&msg); | |
162 | ||
163 | debug3("SSH2_FXP_STATUS %u", status); | |
164 | ||
165 | return(status); | |
166 | } | |
167 | ||
168 | static char * | |
169 | get_handle(int fd, u_int expected_id, u_int *len) | |
170 | { | |
171 | Buffer msg; | |
172 | u_int type, id; | |
173 | char *handle; | |
174 | ||
175 | buffer_init(&msg); | |
176 | get_msg(fd, &msg); | |
177 | type = buffer_get_char(&msg); | |
178 | id = buffer_get_int(&msg); | |
179 | ||
180 | if (id != expected_id) | |
181 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
182 | if (type == SSH2_FXP_STATUS) { | |
183 | int status = buffer_get_int(&msg); | |
184 | ||
185 | error("Couldn't get handle: %s", fx2txt(status)); | |
186 | buffer_free(&msg); | |
187 | return(NULL); | |
188 | } else if (type != SSH2_FXP_HANDLE) | |
189 | fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u", | |
190 | SSH2_FXP_HANDLE, type); | |
191 | ||
192 | handle = buffer_get_string(&msg, len); | |
193 | buffer_free(&msg); | |
194 | ||
195 | return(handle); | |
196 | } | |
197 | ||
198 | static Attrib * | |
199 | get_decode_stat(int fd, u_int expected_id, int quiet) | |
200 | { | |
201 | Buffer msg; | |
202 | u_int type, id; | |
203 | Attrib *a; | |
204 | ||
205 | buffer_init(&msg); | |
206 | get_msg(fd, &msg); | |
207 | ||
208 | type = buffer_get_char(&msg); | |
209 | id = buffer_get_int(&msg); | |
210 | ||
211 | debug3("Received stat reply T:%u I:%u", type, id); | |
212 | if (id != expected_id) | |
213 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
214 | if (type == SSH2_FXP_STATUS) { | |
215 | int status = buffer_get_int(&msg); | |
216 | ||
217 | if (quiet) | |
218 | debug("Couldn't stat remote file: %s", fx2txt(status)); | |
219 | else | |
220 | error("Couldn't stat remote file: %s", fx2txt(status)); | |
221 | buffer_free(&msg); | |
222 | return(NULL); | |
223 | } else if (type != SSH2_FXP_ATTRS) { | |
224 | fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u", | |
225 | SSH2_FXP_ATTRS, type); | |
226 | } | |
227 | a = decode_attrib(&msg); | |
228 | buffer_free(&msg); | |
229 | ||
230 | return(a); | |
231 | } | |
232 | ||
233 | struct sftp_conn * | |
234 | do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) | |
235 | { | |
236 | u_int type; | |
237 | int version; | |
238 | Buffer msg; | |
239 | struct sftp_conn *ret; | |
240 | ||
241 | buffer_init(&msg); | |
242 | buffer_put_char(&msg, SSH2_FXP_INIT); | |
243 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
244 | send_msg(fd_out, &msg); | |
245 | ||
246 | buffer_clear(&msg); | |
247 | ||
248 | get_msg(fd_in, &msg); | |
249 | ||
250 | /* Expecting a VERSION reply */ | |
251 | if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { | |
252 | error("Invalid packet back from SSH2_FXP_INIT (type %u)", | |
253 | type); | |
254 | buffer_free(&msg); | |
255 | return(NULL); | |
256 | } | |
257 | version = buffer_get_int(&msg); | |
258 | ||
259 | debug2("Remote version: %d", version); | |
260 | ||
261 | /* Check for extensions */ | |
262 | while (buffer_len(&msg) > 0) { | |
263 | char *name = buffer_get_string(&msg, NULL); | |
264 | char *value = buffer_get_string(&msg, NULL); | |
265 | ||
266 | debug2("Init extension: \"%s\"", name); | |
267 | xfree(name); | |
268 | xfree(value); | |
269 | } | |
270 | ||
271 | buffer_free(&msg); | |
272 | ||
273 | ret = xmalloc(sizeof(*ret)); | |
274 | ret->fd_in = fd_in; | |
275 | ret->fd_out = fd_out; | |
276 | ret->transfer_buflen = transfer_buflen; | |
277 | ret->num_requests = num_requests; | |
278 | ret->version = version; | |
279 | ret->msg_id = 1; | |
280 | ||
281 | /* Some filexfer v.0 servers don't support large packets */ | |
282 | if (version == 0) | |
283 | ret->transfer_buflen = MIN(ret->transfer_buflen, 20480); | |
284 | ||
285 | return(ret); | |
286 | } | |
287 | ||
288 | u_int | |
289 | sftp_proto_version(struct sftp_conn *conn) | |
290 | { | |
291 | return(conn->version); | |
292 | } | |
293 | ||
294 | int | |
295 | do_close(struct sftp_conn *conn, char *handle, u_int handle_len) | |
296 | { | |
297 | u_int id, status; | |
298 | Buffer msg; | |
299 | ||
300 | buffer_init(&msg); | |
301 | ||
302 | id = conn->msg_id++; | |
303 | buffer_put_char(&msg, SSH2_FXP_CLOSE); | |
304 | buffer_put_int(&msg, id); | |
305 | buffer_put_string(&msg, handle, handle_len); | |
306 | send_msg(conn->fd_out, &msg); | |
307 | debug3("Sent message SSH2_FXP_CLOSE I:%u", id); | |
308 | ||
309 | status = get_status(conn->fd_in, id); | |
310 | if (status != SSH2_FX_OK) | |
311 | error("Couldn't close file: %s", fx2txt(status)); | |
312 | ||
313 | buffer_free(&msg); | |
314 | ||
315 | return(status); | |
316 | } | |
317 | ||
318 | ||
319 | static int | |
320 | do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, | |
321 | SFTP_DIRENT ***dir) | |
322 | { | |
323 | Buffer msg; | |
324 | u_int count, type, id, handle_len, i, expected_id, ents = 0; | |
325 | char *handle; | |
326 | ||
327 | id = conn->msg_id++; | |
328 | ||
329 | buffer_init(&msg); | |
330 | buffer_put_char(&msg, SSH2_FXP_OPENDIR); | |
331 | buffer_put_int(&msg, id); | |
332 | buffer_put_cstring(&msg, path); | |
333 | send_msg(conn->fd_out, &msg); | |
334 | ||
335 | buffer_clear(&msg); | |
336 | ||
337 | handle = get_handle(conn->fd_in, id, &handle_len); | |
338 | if (handle == NULL) | |
339 | return(-1); | |
340 | ||
341 | if (dir) { | |
342 | ents = 0; | |
343 | *dir = xmalloc(sizeof(**dir)); | |
344 | (*dir)[0] = NULL; | |
345 | } | |
346 | ||
347 | for (; !interrupted;) { | |
348 | id = expected_id = conn->msg_id++; | |
349 | ||
350 | debug3("Sending SSH2_FXP_READDIR I:%u", id); | |
351 | ||
352 | buffer_clear(&msg); | |
353 | buffer_put_char(&msg, SSH2_FXP_READDIR); | |
354 | buffer_put_int(&msg, id); | |
355 | buffer_put_string(&msg, handle, handle_len); | |
356 | send_msg(conn->fd_out, &msg); | |
357 | ||
358 | buffer_clear(&msg); | |
359 | ||
360 | get_msg(conn->fd_in, &msg); | |
361 | ||
362 | type = buffer_get_char(&msg); | |
363 | id = buffer_get_int(&msg); | |
364 | ||
365 | debug3("Received reply T:%u I:%u", type, id); | |
366 | ||
367 | if (id != expected_id) | |
368 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
369 | ||
370 | if (type == SSH2_FXP_STATUS) { | |
371 | int status = buffer_get_int(&msg); | |
372 | ||
373 | debug3("Received SSH2_FXP_STATUS %d", status); | |
374 | ||
375 | if (status == SSH2_FX_EOF) { | |
376 | break; | |
377 | } else { | |
378 | error("Couldn't read directory: %s", | |
379 | fx2txt(status)); | |
380 | do_close(conn, handle, handle_len); | |
381 | xfree(handle); | |
382 | return(status); | |
383 | } | |
384 | } else if (type != SSH2_FXP_NAME) | |
385 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
386 | SSH2_FXP_NAME, type); | |
387 | ||
388 | count = buffer_get_int(&msg); | |
389 | if (count == 0) | |
390 | break; | |
391 | debug3("Received %d SSH2_FXP_NAME responses", count); | |
392 | for (i = 0; i < count; i++) { | |
393 | char *filename, *longname; | |
394 | Attrib *a; | |
395 | ||
396 | filename = buffer_get_string(&msg, NULL); | |
397 | longname = buffer_get_string(&msg, NULL); | |
398 | a = decode_attrib(&msg); | |
399 | ||
400 | if (printflag) | |
401 | printf("%s\n", longname); | |
402 | ||
403 | if (dir) { | |
404 | *dir = xrealloc(*dir, ents + 2, sizeof(**dir)); | |
405 | (*dir)[ents] = xmalloc(sizeof(***dir)); | |
406 | (*dir)[ents]->filename = xstrdup(filename); | |
407 | (*dir)[ents]->longname = xstrdup(longname); | |
408 | memcpy(&(*dir)[ents]->a, a, sizeof(*a)); | |
409 | (*dir)[++ents] = NULL; | |
410 | } | |
411 | ||
412 | xfree(filename); | |
413 | xfree(longname); | |
414 | } | |
415 | } | |
416 | ||
417 | buffer_free(&msg); | |
418 | do_close(conn, handle, handle_len); | |
419 | xfree(handle); | |
420 | ||
421 | /* Don't return partial matches on interrupt */ | |
422 | if (interrupted && dir != NULL && *dir != NULL) { | |
423 | free_sftp_dirents(*dir); | |
424 | *dir = xmalloc(sizeof(**dir)); | |
425 | **dir = NULL; | |
426 | } | |
427 | ||
428 | return(0); | |
429 | } | |
430 | ||
431 | int | |
432 | do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) | |
433 | { | |
434 | return(do_lsreaddir(conn, path, 0, dir)); | |
435 | } | |
436 | ||
437 | void free_sftp_dirents(SFTP_DIRENT **s) | |
438 | { | |
439 | int i; | |
440 | ||
441 | for (i = 0; s[i]; i++) { | |
442 | xfree(s[i]->filename); | |
443 | xfree(s[i]->longname); | |
444 | xfree(s[i]); | |
445 | } | |
446 | xfree(s); | |
447 | } | |
448 | ||
449 | int | |
450 | do_rm(struct sftp_conn *conn, char *path) | |
451 | { | |
452 | u_int status, id; | |
453 | ||
454 | debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); | |
455 | ||
456 | id = conn->msg_id++; | |
457 | send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, | |
458 | strlen(path)); | |
459 | status = get_status(conn->fd_in, id); | |
460 | if (status != SSH2_FX_OK) | |
461 | error("Couldn't delete file: %s", fx2txt(status)); | |
462 | return(status); | |
463 | } | |
464 | ||
465 | int | |
466 | do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) | |
467 | { | |
468 | u_int status, id; | |
469 | ||
470 | id = conn->msg_id++; | |
471 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, | |
472 | strlen(path), a); | |
473 | ||
474 | status = get_status(conn->fd_in, id); | |
475 | if (status != SSH2_FX_OK) | |
476 | error("Couldn't create directory: %s", fx2txt(status)); | |
477 | ||
478 | return(status); | |
479 | } | |
480 | ||
481 | int | |
482 | do_rmdir(struct sftp_conn *conn, char *path) | |
483 | { | |
484 | u_int status, id; | |
485 | ||
486 | id = conn->msg_id++; | |
487 | send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, | |
488 | strlen(path)); | |
489 | ||
490 | status = get_status(conn->fd_in, id); | |
491 | if (status != SSH2_FX_OK) | |
492 | error("Couldn't remove directory: %s", fx2txt(status)); | |
493 | ||
494 | return(status); | |
495 | } | |
496 | ||
497 | Attrib * | |
498 | do_stat(struct sftp_conn *conn, char *path, int quiet) | |
499 | { | |
500 | u_int id; | |
501 | ||
502 | id = conn->msg_id++; | |
503 | ||
504 | send_string_request(conn->fd_out, id, | |
505 | conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, | |
506 | path, strlen(path)); | |
507 | ||
508 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
509 | } | |
510 | ||
511 | Attrib * | |
512 | do_lstat(struct sftp_conn *conn, char *path, int quiet) | |
513 | { | |
514 | u_int id; | |
515 | ||
516 | if (conn->version == 0) { | |
517 | if (quiet) | |
518 | debug("Server version does not support lstat operation"); | |
519 | else | |
520 | logit("Server version does not support lstat operation"); | |
521 | return(do_stat(conn, path, quiet)); | |
522 | } | |
523 | ||
524 | id = conn->msg_id++; | |
525 | send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, | |
526 | strlen(path)); | |
527 | ||
528 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
529 | } | |
530 | ||
531 | Attrib * | |
532 | do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) | |
533 | { | |
534 | u_int id; | |
535 | ||
536 | id = conn->msg_id++; | |
537 | send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, | |
538 | handle_len); | |
539 | ||
540 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
541 | } | |
542 | ||
543 | int | |
544 | do_setstat(struct sftp_conn *conn, char *path, Attrib *a) | |
545 | { | |
546 | u_int status, id; | |
547 | ||
548 | id = conn->msg_id++; | |
549 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, | |
550 | strlen(path), a); | |
551 | ||
552 | status = get_status(conn->fd_in, id); | |
553 | if (status != SSH2_FX_OK) | |
554 | error("Couldn't setstat on \"%s\": %s", path, | |
555 | fx2txt(status)); | |
556 | ||
557 | return(status); | |
558 | } | |
559 | ||
560 | int | |
561 | do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, | |
562 | Attrib *a) | |
563 | { | |
564 | u_int status, id; | |
565 | ||
566 | id = conn->msg_id++; | |
567 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, | |
568 | handle_len, a); | |
569 | ||
570 | status = get_status(conn->fd_in, id); | |
571 | if (status != SSH2_FX_OK) | |
572 | error("Couldn't fsetstat: %s", fx2txt(status)); | |
573 | ||
574 | return(status); | |
575 | } | |
576 | ||
577 | char * | |
578 | do_realpath(struct sftp_conn *conn, char *path) | |
579 | { | |
580 | Buffer msg; | |
581 | u_int type, expected_id, count, id; | |
582 | char *filename, *longname; | |
583 | Attrib *a; | |
584 | ||
585 | expected_id = id = conn->msg_id++; | |
586 | send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, | |
587 | strlen(path)); | |
588 | ||
589 | buffer_init(&msg); | |
590 | ||
591 | get_msg(conn->fd_in, &msg); | |
592 | type = buffer_get_char(&msg); | |
593 | id = buffer_get_int(&msg); | |
594 | ||
595 | if (id != expected_id) | |
596 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
597 | ||
598 | if (type == SSH2_FXP_STATUS) { | |
599 | u_int status = buffer_get_int(&msg); | |
600 | ||
601 | error("Couldn't canonicalise: %s", fx2txt(status)); | |
602 | return(NULL); | |
603 | } else if (type != SSH2_FXP_NAME) | |
604 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
605 | SSH2_FXP_NAME, type); | |
606 | ||
607 | count = buffer_get_int(&msg); | |
608 | if (count != 1) | |
609 | fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); | |
610 | ||
611 | filename = buffer_get_string(&msg, NULL); | |
612 | longname = buffer_get_string(&msg, NULL); | |
613 | a = decode_attrib(&msg); | |
614 | ||
615 | debug3("SSH_FXP_REALPATH %s -> %s", path, filename); | |
616 | ||
617 | xfree(longname); | |
618 | ||
619 | buffer_free(&msg); | |
620 | ||
621 | return(filename); | |
622 | } | |
623 | ||
624 | int | |
625 | do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) | |
626 | { | |
627 | Buffer msg; | |
628 | u_int status, id; | |
629 | ||
630 | buffer_init(&msg); | |
631 | ||
632 | /* Send rename request */ | |
633 | id = conn->msg_id++; | |
634 | buffer_put_char(&msg, SSH2_FXP_RENAME); | |
635 | buffer_put_int(&msg, id); | |
636 | buffer_put_cstring(&msg, oldpath); | |
637 | buffer_put_cstring(&msg, newpath); | |
638 | send_msg(conn->fd_out, &msg); | |
639 | debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, | |
640 | newpath); | |
641 | buffer_free(&msg); | |
642 | ||
643 | status = get_status(conn->fd_in, id); | |
644 | if (status != SSH2_FX_OK) | |
645 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
646 | newpath, fx2txt(status)); | |
647 | ||
648 | return(status); | |
649 | } | |
650 | ||
651 | int | |
652 | do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) | |
653 | { | |
654 | Buffer msg; | |
655 | u_int status, id; | |
656 | ||
657 | if (conn->version < 3) { | |
658 | error("This server does not support the symlink operation"); | |
659 | return(SSH2_FX_OP_UNSUPPORTED); | |
660 | } | |
661 | ||
662 | buffer_init(&msg); | |
663 | ||
664 | /* Send symlink request */ | |
665 | id = conn->msg_id++; | |
666 | buffer_put_char(&msg, SSH2_FXP_SYMLINK); | |
667 | buffer_put_int(&msg, id); | |
668 | buffer_put_cstring(&msg, oldpath); | |
669 | buffer_put_cstring(&msg, newpath); | |
670 | send_msg(conn->fd_out, &msg); | |
671 | debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, | |
672 | newpath); | |
673 | buffer_free(&msg); | |
674 | ||
675 | status = get_status(conn->fd_in, id); | |
676 | if (status != SSH2_FX_OK) | |
677 | error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath, | |
678 | newpath, fx2txt(status)); | |
679 | ||
680 | return(status); | |
681 | } | |
682 | ||
683 | char * | |
684 | do_readlink(struct sftp_conn *conn, char *path) | |
685 | { | |
686 | Buffer msg; | |
687 | u_int type, expected_id, count, id; | |
688 | char *filename, *longname; | |
689 | Attrib *a; | |
690 | ||
691 | expected_id = id = conn->msg_id++; | |
692 | send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, | |
693 | strlen(path)); | |
694 | ||
695 | buffer_init(&msg); | |
696 | ||
697 | get_msg(conn->fd_in, &msg); | |
698 | type = buffer_get_char(&msg); | |
699 | id = buffer_get_int(&msg); | |
700 | ||
701 | if (id != expected_id) | |
702 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
703 | ||
704 | if (type == SSH2_FXP_STATUS) { | |
705 | u_int status = buffer_get_int(&msg); | |
706 | ||
707 | error("Couldn't readlink: %s", fx2txt(status)); | |
708 | return(NULL); | |
709 | } else if (type != SSH2_FXP_NAME) | |
710 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
711 | SSH2_FXP_NAME, type); | |
712 | ||
713 | count = buffer_get_int(&msg); | |
714 | if (count != 1) | |
715 | fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); | |
716 | ||
717 | filename = buffer_get_string(&msg, NULL); | |
718 | longname = buffer_get_string(&msg, NULL); | |
719 | a = decode_attrib(&msg); | |
720 | ||
721 | debug3("SSH_FXP_READLINK %s -> %s", path, filename); | |
722 | ||
723 | xfree(longname); | |
724 | ||
725 | buffer_free(&msg); | |
726 | ||
727 | return(filename); | |
728 | } | |
729 | ||
730 | static void | |
731 | send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, | |
732 | char *handle, u_int handle_len) | |
733 | { | |
734 | Buffer msg; | |
735 | ||
736 | buffer_init(&msg); | |
737 | buffer_clear(&msg); | |
738 | buffer_put_char(&msg, SSH2_FXP_READ); | |
739 | buffer_put_int(&msg, id); | |
740 | buffer_put_string(&msg, handle, handle_len); | |
741 | buffer_put_int64(&msg, offset); | |
742 | buffer_put_int(&msg, len); | |
743 | send_msg(fd_out, &msg); | |
744 | buffer_free(&msg); | |
745 | } | |
746 | ||
747 | int | |
748 | do_download(struct sftp_conn *conn, char *remote_path, char *local_path, | |
749 | int pflag) | |
750 | { | |
751 | Attrib junk, *a; | |
752 | Buffer msg; | |
753 | char *handle; | |
754 | int local_fd, status = 0, write_error; | |
755 | int read_error, write_errno; | |
756 | u_int64_t offset, size; | |
757 | u_int handle_len, mode, type, id, buflen, num_req, max_req; | |
758 | off_t progress_counter; | |
759 | struct request { | |
760 | u_int id; | |
761 | u_int len; | |
762 | u_int64_t offset; | |
763 | TAILQ_ENTRY(request) tq; | |
764 | }; | |
765 | TAILQ_HEAD(reqhead, request) requests; | |
766 | struct request *req; | |
767 | ||
768 | TAILQ_INIT(&requests); | |
769 | ||
770 | a = do_stat(conn, remote_path, 0); | |
771 | if (a == NULL) | |
772 | return(-1); | |
773 | ||
774 | /* XXX: should we preserve set[ug]id? */ | |
775 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) | |
776 | mode = a->perm & 0777; | |
777 | else | |
778 | mode = 0666; | |
779 | ||
780 | if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && | |
781 | (!S_ISREG(a->perm))) { | |
782 | error("Cannot download non-regular file: %s", remote_path); | |
783 | return(-1); | |
784 | } | |
785 | ||
786 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) | |
787 | size = a->size; | |
788 | else | |
789 | size = 0; | |
790 | ||
791 | buflen = conn->transfer_buflen; | |
792 | buffer_init(&msg); | |
793 | ||
794 | /* Send open request */ | |
795 | id = conn->msg_id++; | |
796 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
797 | buffer_put_int(&msg, id); | |
798 | buffer_put_cstring(&msg, remote_path); | |
799 | buffer_put_int(&msg, SSH2_FXF_READ); | |
800 | attrib_clear(&junk); /* Send empty attributes */ | |
801 | encode_attrib(&msg, &junk); | |
802 | send_msg(conn->fd_out, &msg); | |
803 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
804 | ||
805 | handle = get_handle(conn->fd_in, id, &handle_len); | |
806 | if (handle == NULL) { | |
807 | buffer_free(&msg); | |
808 | return(-1); | |
809 | } | |
810 | ||
811 | local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, | |
812 | mode | S_IWRITE); | |
813 | if (local_fd == -1) { | |
814 | error("Couldn't open local file \"%s\" for writing: %s", | |
815 | local_path, strerror(errno)); | |
816 | buffer_free(&msg); | |
817 | xfree(handle); | |
818 | return(-1); | |
819 | } | |
820 | ||
821 | /* Read from remote and write to local */ | |
822 | write_error = read_error = write_errno = num_req = offset = 0; | |
823 | max_req = 1; | |
824 | progress_counter = 0; | |
825 | ||
826 | if (showprogress && size != 0) | |
827 | start_progress_meter(remote_path, size, &progress_counter); | |
828 | ||
829 | while (num_req > 0 || max_req > 0) { | |
830 | char *data; | |
831 | u_int len; | |
832 | ||
833 | /* | |
834 | * Simulate EOF on interrupt: stop sending new requests and | |
835 | * allow outstanding requests to drain gracefully | |
836 | */ | |
837 | if (interrupted) { | |
838 | if (num_req == 0) /* If we haven't started yet... */ | |
839 | break; | |
840 | max_req = 0; | |
841 | } | |
842 | ||
843 | /* Send some more requests */ | |
844 | while (num_req < max_req) { | |
845 | debug3("Request range %llu -> %llu (%d/%d)", | |
846 | (unsigned long long)offset, | |
847 | (unsigned long long)offset + buflen - 1, | |
848 | num_req, max_req); | |
849 | req = xmalloc(sizeof(*req)); | |
850 | req->id = conn->msg_id++; | |
851 | req->len = buflen; | |
852 | req->offset = offset; | |
853 | offset += buflen; | |
854 | num_req++; | |
855 | TAILQ_INSERT_TAIL(&requests, req, tq); | |
856 | send_read_request(conn->fd_out, req->id, req->offset, | |
857 | req->len, handle, handle_len); | |
858 | } | |
859 | ||
860 | buffer_clear(&msg); | |
861 | get_msg(conn->fd_in, &msg); | |
862 | type = buffer_get_char(&msg); | |
863 | id = buffer_get_int(&msg); | |
864 | debug3("Received reply T:%u I:%u R:%d", type, id, max_req); | |
865 | ||
866 | /* Find the request in our queue */ | |
867 | for (req = TAILQ_FIRST(&requests); | |
868 | req != NULL && req->id != id; | |
869 | req = TAILQ_NEXT(req, tq)) | |
870 | ; | |
871 | if (req == NULL) | |
872 | fatal("Unexpected reply %u", id); | |
873 | ||
874 | switch (type) { | |
875 | case SSH2_FXP_STATUS: | |
876 | status = buffer_get_int(&msg); | |
877 | if (status != SSH2_FX_EOF) | |
878 | read_error = 1; | |
879 | max_req = 0; | |
880 | TAILQ_REMOVE(&requests, req, tq); | |
881 | xfree(req); | |
882 | num_req--; | |
883 | break; | |
884 | case SSH2_FXP_DATA: | |
885 | data = buffer_get_string(&msg, &len); | |
886 | debug3("Received data %llu -> %llu", | |
887 | (unsigned long long)req->offset, | |
888 | (unsigned long long)req->offset + len - 1); | |
889 | if (len > req->len) | |
890 | fatal("Received more data than asked for " | |
891 | "%u > %u", len, req->len); | |
892 | if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || | |
893 | atomicio(vwrite, local_fd, data, len) != len) && | |
894 | !write_error) { | |
895 | write_errno = errno; | |
896 | write_error = 1; | |
897 | max_req = 0; | |
898 | } | |
899 | progress_counter += len; | |
900 | xfree(data); | |
901 | ||
902 | if (len == req->len) { | |
903 | TAILQ_REMOVE(&requests, req, tq); | |
904 | xfree(req); | |
905 | num_req--; | |
906 | } else { | |
907 | /* Resend the request for the missing data */ | |
908 | debug3("Short data block, re-requesting " | |
909 | "%llu -> %llu (%2d)", | |
910 | (unsigned long long)req->offset + len, | |
911 | (unsigned long long)req->offset + | |
912 | req->len - 1, num_req); | |
913 | req->id = conn->msg_id++; | |
914 | req->len -= len; | |
915 | req->offset += len; | |
916 | send_read_request(conn->fd_out, req->id, | |
917 | req->offset, req->len, handle, handle_len); | |
918 | /* Reduce the request size */ | |
919 | if (len < buflen) | |
920 | buflen = MAX(MIN_READ_SIZE, len); | |
921 | } | |
922 | if (max_req > 0) { /* max_req = 0 iff EOF received */ | |
923 | if (size > 0 && offset > size) { | |
924 | /* Only one request at a time | |
925 | * after the expected EOF */ | |
926 | debug3("Finish at %llu (%2d)", | |
927 | (unsigned long long)offset, | |
928 | num_req); | |
929 | max_req = 1; | |
930 | } else if (max_req <= conn->num_requests) { | |
931 | ++max_req; | |
932 | } | |
933 | } | |
934 | break; | |
935 | default: | |
936 | fatal("Expected SSH2_FXP_DATA(%u) packet, got %u", | |
937 | SSH2_FXP_DATA, type); | |
938 | } | |
939 | } | |
940 | ||
941 | if (showprogress && size) | |
942 | stop_progress_meter(); | |
943 | ||
944 | /* Sanity check */ | |
945 | if (TAILQ_FIRST(&requests) != NULL) | |
946 | fatal("Transfer complete, but requests still in queue"); | |
947 | ||
948 | if (read_error) { | |
949 | error("Couldn't read from remote file \"%s\" : %s", | |
950 | remote_path, fx2txt(status)); | |
951 | do_close(conn, handle, handle_len); | |
952 | } else if (write_error) { | |
953 | error("Couldn't write to \"%s\": %s", local_path, | |
954 | strerror(write_errno)); | |
955 | status = -1; | |
956 | do_close(conn, handle, handle_len); | |
957 | } else { | |
958 | status = do_close(conn, handle, handle_len); | |
959 | ||
960 | /* Override umask and utimes if asked */ | |
961 | #ifdef HAVE_FCHMOD | |
962 | if (pflag && fchmod(local_fd, mode) == -1) | |
963 | #else | |
964 | if (pflag && chmod(local_path, mode) == -1) | |
965 | #endif /* HAVE_FCHMOD */ | |
966 | error("Couldn't set mode on \"%s\": %s", local_path, | |
967 | strerror(errno)); | |
968 | if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { | |
969 | struct timeval tv[2]; | |
970 | tv[0].tv_sec = a->atime; | |
971 | tv[1].tv_sec = a->mtime; | |
972 | tv[0].tv_usec = tv[1].tv_usec = 0; | |
973 | if (utimes(local_path, tv) == -1) | |
974 | error("Can't set times on \"%s\": %s", | |
975 | local_path, strerror(errno)); | |
976 | } | |
977 | } | |
978 | close(local_fd); | |
979 | buffer_free(&msg); | |
980 | xfree(handle); | |
981 | ||
982 | return(status); | |
983 | } | |
984 | ||
985 | int | |
986 | do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, | |
987 | int pflag) | |
988 | { | |
989 | int local_fd, status; | |
990 | u_int handle_len, id, type; | |
991 | u_int64_t offset; | |
992 | char *handle, *data; | |
993 | Buffer msg; | |
994 | struct stat sb; | |
995 | Attrib a; | |
996 | u_int32_t startid; | |
997 | u_int32_t ackid; | |
998 | struct outstanding_ack { | |
999 | u_int id; | |
1000 | u_int len; | |
1001 | u_int64_t offset; | |
1002 | TAILQ_ENTRY(outstanding_ack) tq; | |
1003 | }; | |
1004 | TAILQ_HEAD(ackhead, outstanding_ack) acks; | |
1005 | struct outstanding_ack *ack = NULL; | |
1006 | ||
1007 | TAILQ_INIT(&acks); | |
1008 | ||
1009 | if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { | |
1010 | error("Couldn't open local file \"%s\" for reading: %s", | |
1011 | local_path, strerror(errno)); | |
1012 | return(-1); | |
1013 | } | |
1014 | if (fstat(local_fd, &sb) == -1) { | |
1015 | error("Couldn't fstat local file \"%s\": %s", | |
1016 | local_path, strerror(errno)); | |
1017 | close(local_fd); | |
1018 | return(-1); | |
1019 | } | |
1020 | if (!S_ISREG(sb.st_mode)) { | |
1021 | error("%s is not a regular file", local_path); | |
1022 | close(local_fd); | |
1023 | return(-1); | |
1024 | } | |
1025 | stat_to_attrib(&sb, &a); | |
1026 | ||
1027 | a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; | |
1028 | a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; | |
1029 | a.perm &= 0777; | |
1030 | if (!pflag) | |
1031 | a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; | |
1032 | ||
1033 | buffer_init(&msg); | |
1034 | ||
1035 | /* Send open request */ | |
1036 | id = conn->msg_id++; | |
1037 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
1038 | buffer_put_int(&msg, id); | |
1039 | buffer_put_cstring(&msg, remote_path); | |
1040 | buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); | |
1041 | encode_attrib(&msg, &a); | |
1042 | send_msg(conn->fd_out, &msg); | |
1043 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
1044 | ||
1045 | buffer_clear(&msg); | |
1046 | ||
1047 | handle = get_handle(conn->fd_in, id, &handle_len); | |
1048 | if (handle == NULL) { | |
1049 | close(local_fd); | |
1050 | buffer_free(&msg); | |
1051 | return(-1); | |
1052 | } | |
1053 | ||
1054 | startid = ackid = id + 1; | |
1055 | data = xmalloc(conn->transfer_buflen); | |
1056 | ||
1057 | /* Read from local and write to remote */ | |
1058 | offset = 0; | |
1059 | if (showprogress) | |
1060 | start_progress_meter(local_path, sb.st_size, &offset); | |
1061 | ||
1062 | for (;;) { | |
1063 | int len; | |
1064 | ||
1065 | /* | |
1066 | * Can't use atomicio here because it returns 0 on EOF, | |
1067 | * thus losing the last block of the file. | |
1068 | * Simulate an EOF on interrupt, allowing ACKs from the | |
1069 | * server to drain. | |
1070 | */ | |
1071 | if (interrupted) | |
1072 | len = 0; | |
1073 | else do | |
1074 | len = read(local_fd, data, conn->transfer_buflen); | |
1075 | while ((len == -1) && (errno == EINTR || errno == EAGAIN)); | |
1076 | ||
1077 | if (len == -1) | |
1078 | fatal("Couldn't read from \"%s\": %s", local_path, | |
1079 | strerror(errno)); | |
1080 | ||
1081 | if (len != 0) { | |
1082 | ack = xmalloc(sizeof(*ack)); | |
1083 | ack->id = ++id; | |
1084 | ack->offset = offset; | |
1085 | ack->len = len; | |
1086 | TAILQ_INSERT_TAIL(&acks, ack, tq); | |
1087 | ||
1088 | buffer_clear(&msg); | |
1089 | buffer_put_char(&msg, SSH2_FXP_WRITE); | |
1090 | buffer_put_int(&msg, ack->id); | |
1091 | buffer_put_string(&msg, handle, handle_len); | |
1092 | buffer_put_int64(&msg, offset); | |
1093 | buffer_put_string(&msg, data, len); | |
1094 | send_msg(conn->fd_out, &msg); | |
1095 | debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u", | |
1096 | id, (unsigned long long)offset, len); | |
1097 | } else if (TAILQ_FIRST(&acks) == NULL) | |
1098 | break; | |
1099 | ||
1100 | if (ack == NULL) | |
1101 | fatal("Unexpected ACK %u", id); | |
1102 | ||
1103 | if (id == startid || len == 0 || | |
1104 | id - ackid >= conn->num_requests) { | |
1105 | u_int r_id; | |
1106 | ||
1107 | buffer_clear(&msg); | |
1108 | get_msg(conn->fd_in, &msg); | |
1109 | type = buffer_get_char(&msg); | |
1110 | r_id = buffer_get_int(&msg); | |
1111 | ||
1112 | if (type != SSH2_FXP_STATUS) | |
1113 | fatal("Expected SSH2_FXP_STATUS(%d) packet, " | |
1114 | "got %d", SSH2_FXP_STATUS, type); | |
1115 | ||
1116 | status = buffer_get_int(&msg); | |
1117 | debug3("SSH2_FXP_STATUS %d", status); | |
1118 | ||
1119 | /* Find the request in our queue */ | |
1120 | for (ack = TAILQ_FIRST(&acks); | |
1121 | ack != NULL && ack->id != r_id; | |
1122 | ack = TAILQ_NEXT(ack, tq)) | |
1123 | ; | |
1124 | if (ack == NULL) | |
1125 | fatal("Can't find request for ID %u", r_id); | |
1126 | TAILQ_REMOVE(&acks, ack, tq); | |
1127 | ||
1128 | if (status != SSH2_FX_OK) { | |
1129 | error("Couldn't write to remote file \"%s\": %s", | |
1130 | remote_path, fx2txt(status)); | |
1131 | do_close(conn, handle, handle_len); | |
1132 | close(local_fd); | |
1133 | xfree(data); | |
1134 | xfree(ack); | |
1135 | goto done; | |
1136 | } | |
1137 | debug3("In write loop, ack for %u %u bytes at %llu", | |
1138 | ack->id, ack->len, (unsigned long long)ack->offset); | |
1139 | ++ackid; | |
1140 | xfree(ack); | |
1141 | } | |
1142 | offset += len; | |
1143 | } | |
1144 | if (showprogress) | |
1145 | stop_progress_meter(); | |
1146 | xfree(data); | |
1147 | ||
1148 | if (close(local_fd) == -1) { | |
1149 | error("Couldn't close local file \"%s\": %s", local_path, | |
1150 | strerror(errno)); | |
1151 | do_close(conn, handle, handle_len); | |
1152 | status = -1; | |
1153 | goto done; | |
1154 | } | |
1155 | ||
1156 | /* Override umask and utimes if asked */ | |
1157 | if (pflag) | |
1158 | do_fsetstat(conn, handle, handle_len, &a); | |
1159 | ||
1160 | status = do_close(conn, handle, handle_len); | |
1161 | ||
1162 | done: | |
1163 | xfree(handle); | |
1164 | buffer_free(&msg); | |
1165 | return(status); | |
1166 | } |