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1 | /* | |
2 | * Copyright (c) 2001,2002 Damien Miller. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | ||
25 | /* XXX: memleaks */ | |
26 | /* XXX: signed vs unsigned */ | |
27 | /* XXX: remove all logging, only return status codes */ | |
28 | /* XXX: copy between two remote sites */ | |
29 | ||
30 | #include "includes.h" | |
31 | RCSID("$OpenBSD: sftp-client.c,v 1.38 2003/01/06 23:51:22 djm Exp $"); | |
32 | ||
33 | #include "openbsd-compat/sys-queue.h" | |
34 | ||
35 | #include "buffer.h" | |
36 | #include "bufaux.h" | |
37 | #include "getput.h" | |
38 | #include "xmalloc.h" | |
39 | #include "log.h" | |
40 | #include "atomicio.h" | |
41 | ||
42 | #include "sftp.h" | |
43 | #include "sftp-common.h" | |
44 | #include "sftp-client.h" | |
45 | ||
46 | /* Minimum amount of data to read at at time */ | |
47 | #define MIN_READ_SIZE 512 | |
48 | ||
49 | struct sftp_conn { | |
50 | int fd_in; | |
51 | int fd_out; | |
52 | u_int transfer_buflen; | |
53 | u_int num_requests; | |
54 | u_int version; | |
55 | u_int msg_id; | |
56 | }; | |
57 | ||
58 | static void | |
59 | send_msg(int fd, Buffer *m) | |
60 | { | |
61 | int mlen = buffer_len(m); | |
62 | int len; | |
63 | Buffer oqueue; | |
64 | ||
65 | buffer_init(&oqueue); | |
66 | buffer_put_int(&oqueue, mlen); | |
67 | buffer_append(&oqueue, buffer_ptr(m), mlen); | |
68 | buffer_consume(m, mlen); | |
69 | ||
70 | len = atomicio(write, fd, buffer_ptr(&oqueue), buffer_len(&oqueue)); | |
71 | if (len <= 0) | |
72 | fatal("Couldn't send packet: %s", strerror(errno)); | |
73 | ||
74 | buffer_free(&oqueue); | |
75 | } | |
76 | ||
77 | static void | |
78 | get_msg(int fd, Buffer *m) | |
79 | { | |
80 | u_int len, msg_len; | |
81 | unsigned char buf[4096]; | |
82 | ||
83 | len = atomicio(read, fd, buf, 4); | |
84 | if (len == 0) | |
85 | fatal("Connection closed"); | |
86 | else if (len == -1) | |
87 | fatal("Couldn't read packet: %s", strerror(errno)); | |
88 | ||
89 | msg_len = GET_32BIT(buf); | |
90 | if (msg_len > 256 * 1024) | |
91 | fatal("Received message too long %u", msg_len); | |
92 | ||
93 | while (msg_len) { | |
94 | len = atomicio(read, fd, buf, MIN(msg_len, sizeof(buf))); | |
95 | if (len == 0) | |
96 | fatal("Connection closed"); | |
97 | else if (len == -1) | |
98 | fatal("Couldn't read packet: %s", strerror(errno)); | |
99 | ||
100 | msg_len -= len; | |
101 | buffer_append(m, buf, len); | |
102 | } | |
103 | } | |
104 | ||
105 | static void | |
106 | send_string_request(int fd, u_int id, u_int code, char *s, | |
107 | u_int len) | |
108 | { | |
109 | Buffer msg; | |
110 | ||
111 | buffer_init(&msg); | |
112 | buffer_put_char(&msg, code); | |
113 | buffer_put_int(&msg, id); | |
114 | buffer_put_string(&msg, s, len); | |
115 | send_msg(fd, &msg); | |
116 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
117 | buffer_free(&msg); | |
118 | } | |
119 | ||
120 | static void | |
121 | send_string_attrs_request(int fd, u_int id, u_int code, char *s, | |
122 | u_int len, Attrib *a) | |
123 | { | |
124 | Buffer msg; | |
125 | ||
126 | buffer_init(&msg); | |
127 | buffer_put_char(&msg, code); | |
128 | buffer_put_int(&msg, id); | |
129 | buffer_put_string(&msg, s, len); | |
130 | encode_attrib(&msg, a); | |
131 | send_msg(fd, &msg); | |
132 | debug3("Sent message fd %d T:%u I:%u", fd, code, id); | |
133 | buffer_free(&msg); | |
134 | } | |
135 | ||
136 | static u_int | |
137 | get_status(int fd, u_int expected_id) | |
138 | { | |
139 | Buffer msg; | |
140 | u_int type, id, status; | |
141 | ||
142 | buffer_init(&msg); | |
143 | get_msg(fd, &msg); | |
144 | type = buffer_get_char(&msg); | |
145 | id = buffer_get_int(&msg); | |
146 | ||
147 | if (id != expected_id) | |
148 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
149 | if (type != SSH2_FXP_STATUS) | |
150 | fatal("Expected SSH2_FXP_STATUS(%u) packet, got %u", | |
151 | SSH2_FXP_STATUS, type); | |
152 | ||
153 | status = buffer_get_int(&msg); | |
154 | buffer_free(&msg); | |
155 | ||
156 | debug3("SSH2_FXP_STATUS %u", status); | |
157 | ||
158 | return(status); | |
159 | } | |
160 | ||
161 | static char * | |
162 | get_handle(int fd, u_int expected_id, u_int *len) | |
163 | { | |
164 | Buffer msg; | |
165 | u_int type, id; | |
166 | char *handle; | |
167 | ||
168 | buffer_init(&msg); | |
169 | get_msg(fd, &msg); | |
170 | type = buffer_get_char(&msg); | |
171 | id = buffer_get_int(&msg); | |
172 | ||
173 | if (id != expected_id) | |
174 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
175 | if (type == SSH2_FXP_STATUS) { | |
176 | int status = buffer_get_int(&msg); | |
177 | ||
178 | error("Couldn't get handle: %s", fx2txt(status)); | |
179 | return(NULL); | |
180 | } else if (type != SSH2_FXP_HANDLE) | |
181 | fatal("Expected SSH2_FXP_HANDLE(%u) packet, got %u", | |
182 | SSH2_FXP_HANDLE, type); | |
183 | ||
184 | handle = buffer_get_string(&msg, len); | |
185 | buffer_free(&msg); | |
186 | ||
187 | return(handle); | |
188 | } | |
189 | ||
190 | static Attrib * | |
191 | get_decode_stat(int fd, u_int expected_id, int quiet) | |
192 | { | |
193 | Buffer msg; | |
194 | u_int type, id; | |
195 | Attrib *a; | |
196 | ||
197 | buffer_init(&msg); | |
198 | get_msg(fd, &msg); | |
199 | ||
200 | type = buffer_get_char(&msg); | |
201 | id = buffer_get_int(&msg); | |
202 | ||
203 | debug3("Received stat reply T:%u I:%u", type, id); | |
204 | if (id != expected_id) | |
205 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
206 | if (type == SSH2_FXP_STATUS) { | |
207 | int status = buffer_get_int(&msg); | |
208 | ||
209 | if (quiet) | |
210 | debug("Couldn't stat remote file: %s", fx2txt(status)); | |
211 | else | |
212 | error("Couldn't stat remote file: %s", fx2txt(status)); | |
213 | return(NULL); | |
214 | } else if (type != SSH2_FXP_ATTRS) { | |
215 | fatal("Expected SSH2_FXP_ATTRS(%u) packet, got %u", | |
216 | SSH2_FXP_ATTRS, type); | |
217 | } | |
218 | a = decode_attrib(&msg); | |
219 | buffer_free(&msg); | |
220 | ||
221 | return(a); | |
222 | } | |
223 | ||
224 | struct sftp_conn * | |
225 | do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) | |
226 | { | |
227 | u_int type; | |
228 | int version; | |
229 | Buffer msg; | |
230 | struct sftp_conn *ret; | |
231 | ||
232 | buffer_init(&msg); | |
233 | buffer_put_char(&msg, SSH2_FXP_INIT); | |
234 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
235 | send_msg(fd_out, &msg); | |
236 | ||
237 | buffer_clear(&msg); | |
238 | ||
239 | get_msg(fd_in, &msg); | |
240 | ||
241 | /* Expecting a VERSION reply */ | |
242 | if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { | |
243 | error("Invalid packet back from SSH2_FXP_INIT (type %u)", | |
244 | type); | |
245 | buffer_free(&msg); | |
246 | return(NULL); | |
247 | } | |
248 | version = buffer_get_int(&msg); | |
249 | ||
250 | debug2("Remote version: %d", version); | |
251 | ||
252 | /* Check for extensions */ | |
253 | while (buffer_len(&msg) > 0) { | |
254 | char *name = buffer_get_string(&msg, NULL); | |
255 | char *value = buffer_get_string(&msg, NULL); | |
256 | ||
257 | debug2("Init extension: \"%s\"", name); | |
258 | xfree(name); | |
259 | xfree(value); | |
260 | } | |
261 | ||
262 | buffer_free(&msg); | |
263 | ||
264 | ret = xmalloc(sizeof(*ret)); | |
265 | ret->fd_in = fd_in; | |
266 | ret->fd_out = fd_out; | |
267 | ret->transfer_buflen = transfer_buflen; | |
268 | ret->num_requests = num_requests; | |
269 | ret->version = version; | |
270 | ret->msg_id = 1; | |
271 | ||
272 | /* Some filexfer v.0 servers don't support large packets */ | |
273 | if (version == 0) | |
274 | ret->transfer_buflen = MIN(ret->transfer_buflen, 20480); | |
275 | ||
276 | return(ret); | |
277 | } | |
278 | ||
279 | u_int | |
280 | sftp_proto_version(struct sftp_conn *conn) | |
281 | { | |
282 | return(conn->version); | |
283 | } | |
284 | ||
285 | int | |
286 | do_close(struct sftp_conn *conn, char *handle, u_int handle_len) | |
287 | { | |
288 | u_int id, status; | |
289 | Buffer msg; | |
290 | ||
291 | buffer_init(&msg); | |
292 | ||
293 | id = conn->msg_id++; | |
294 | buffer_put_char(&msg, SSH2_FXP_CLOSE); | |
295 | buffer_put_int(&msg, id); | |
296 | buffer_put_string(&msg, handle, handle_len); | |
297 | send_msg(conn->fd_out, &msg); | |
298 | debug3("Sent message SSH2_FXP_CLOSE I:%u", id); | |
299 | ||
300 | status = get_status(conn->fd_in, id); | |
301 | if (status != SSH2_FX_OK) | |
302 | error("Couldn't close file: %s", fx2txt(status)); | |
303 | ||
304 | buffer_free(&msg); | |
305 | ||
306 | return(status); | |
307 | } | |
308 | ||
309 | ||
310 | static int | |
311 | do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, | |
312 | SFTP_DIRENT ***dir) | |
313 | { | |
314 | Buffer msg; | |
315 | u_int type, id, handle_len, i, expected_id, ents = 0; | |
316 | char *handle; | |
317 | ||
318 | id = conn->msg_id++; | |
319 | ||
320 | buffer_init(&msg); | |
321 | buffer_put_char(&msg, SSH2_FXP_OPENDIR); | |
322 | buffer_put_int(&msg, id); | |
323 | buffer_put_cstring(&msg, path); | |
324 | send_msg(conn->fd_out, &msg); | |
325 | ||
326 | buffer_clear(&msg); | |
327 | ||
328 | handle = get_handle(conn->fd_in, id, &handle_len); | |
329 | if (handle == NULL) | |
330 | return(-1); | |
331 | ||
332 | if (dir) { | |
333 | ents = 0; | |
334 | *dir = xmalloc(sizeof(**dir)); | |
335 | (*dir)[0] = NULL; | |
336 | } | |
337 | ||
338 | for (;;) { | |
339 | int count; | |
340 | ||
341 | id = expected_id = conn->msg_id++; | |
342 | ||
343 | debug3("Sending SSH2_FXP_READDIR I:%u", id); | |
344 | ||
345 | buffer_clear(&msg); | |
346 | buffer_put_char(&msg, SSH2_FXP_READDIR); | |
347 | buffer_put_int(&msg, id); | |
348 | buffer_put_string(&msg, handle, handle_len); | |
349 | send_msg(conn->fd_out, &msg); | |
350 | ||
351 | buffer_clear(&msg); | |
352 | ||
353 | get_msg(conn->fd_in, &msg); | |
354 | ||
355 | type = buffer_get_char(&msg); | |
356 | id = buffer_get_int(&msg); | |
357 | ||
358 | debug3("Received reply T:%u I:%u", type, id); | |
359 | ||
360 | if (id != expected_id) | |
361 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
362 | ||
363 | if (type == SSH2_FXP_STATUS) { | |
364 | int status = buffer_get_int(&msg); | |
365 | ||
366 | debug3("Received SSH2_FXP_STATUS %d", status); | |
367 | ||
368 | if (status == SSH2_FX_EOF) { | |
369 | break; | |
370 | } else { | |
371 | error("Couldn't read directory: %s", | |
372 | fx2txt(status)); | |
373 | do_close(conn, handle, handle_len); | |
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 | return(0); | |
415 | } | |
416 | ||
417 | int | |
418 | do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) | |
419 | { | |
420 | return(do_lsreaddir(conn, path, 0, dir)); | |
421 | } | |
422 | ||
423 | void free_sftp_dirents(SFTP_DIRENT **s) | |
424 | { | |
425 | int i; | |
426 | ||
427 | for (i = 0; s[i]; i++) { | |
428 | xfree(s[i]->filename); | |
429 | xfree(s[i]->longname); | |
430 | xfree(s[i]); | |
431 | } | |
432 | xfree(s); | |
433 | } | |
434 | ||
435 | int | |
436 | do_rm(struct sftp_conn *conn, char *path) | |
437 | { | |
438 | u_int status, id; | |
439 | ||
440 | debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); | |
441 | ||
442 | id = conn->msg_id++; | |
443 | send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, | |
444 | strlen(path)); | |
445 | status = get_status(conn->fd_in, id); | |
446 | if (status != SSH2_FX_OK) | |
447 | error("Couldn't delete file: %s", fx2txt(status)); | |
448 | return(status); | |
449 | } | |
450 | ||
451 | int | |
452 | do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) | |
453 | { | |
454 | u_int status, id; | |
455 | ||
456 | id = conn->msg_id++; | |
457 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, | |
458 | strlen(path), a); | |
459 | ||
460 | status = get_status(conn->fd_in, id); | |
461 | if (status != SSH2_FX_OK) | |
462 | error("Couldn't create directory: %s", fx2txt(status)); | |
463 | ||
464 | return(status); | |
465 | } | |
466 | ||
467 | int | |
468 | do_rmdir(struct sftp_conn *conn, char *path) | |
469 | { | |
470 | u_int status, id; | |
471 | ||
472 | id = conn->msg_id++; | |
473 | send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, | |
474 | strlen(path)); | |
475 | ||
476 | status = get_status(conn->fd_in, id); | |
477 | if (status != SSH2_FX_OK) | |
478 | error("Couldn't remove directory: %s", fx2txt(status)); | |
479 | ||
480 | return(status); | |
481 | } | |
482 | ||
483 | Attrib * | |
484 | do_stat(struct sftp_conn *conn, char *path, int quiet) | |
485 | { | |
486 | u_int id; | |
487 | ||
488 | id = conn->msg_id++; | |
489 | ||
490 | send_string_request(conn->fd_out, id, | |
491 | conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, | |
492 | path, strlen(path)); | |
493 | ||
494 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
495 | } | |
496 | ||
497 | Attrib * | |
498 | do_lstat(struct sftp_conn *conn, char *path, int quiet) | |
499 | { | |
500 | u_int id; | |
501 | ||
502 | if (conn->version == 0) { | |
503 | if (quiet) | |
504 | debug("Server version does not support lstat operation"); | |
505 | else | |
506 | log("Server version does not support lstat operation"); | |
507 | return(do_stat(conn, path, quiet)); | |
508 | } | |
509 | ||
510 | id = conn->msg_id++; | |
511 | send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, | |
512 | strlen(path)); | |
513 | ||
514 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
515 | } | |
516 | ||
517 | Attrib * | |
518 | do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) | |
519 | { | |
520 | u_int id; | |
521 | ||
522 | id = conn->msg_id++; | |
523 | send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, | |
524 | handle_len); | |
525 | ||
526 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
527 | } | |
528 | ||
529 | int | |
530 | do_setstat(struct sftp_conn *conn, char *path, Attrib *a) | |
531 | { | |
532 | u_int status, id; | |
533 | ||
534 | id = conn->msg_id++; | |
535 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, | |
536 | strlen(path), a); | |
537 | ||
538 | status = get_status(conn->fd_in, id); | |
539 | if (status != SSH2_FX_OK) | |
540 | error("Couldn't setstat on \"%s\": %s", path, | |
541 | fx2txt(status)); | |
542 | ||
543 | return(status); | |
544 | } | |
545 | ||
546 | int | |
547 | do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, | |
548 | Attrib *a) | |
549 | { | |
550 | u_int status, id; | |
551 | ||
552 | id = conn->msg_id++; | |
553 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, | |
554 | handle_len, a); | |
555 | ||
556 | status = get_status(conn->fd_in, id); | |
557 | if (status != SSH2_FX_OK) | |
558 | error("Couldn't fsetstat: %s", fx2txt(status)); | |
559 | ||
560 | return(status); | |
561 | } | |
562 | ||
563 | char * | |
564 | do_realpath(struct sftp_conn *conn, char *path) | |
565 | { | |
566 | Buffer msg; | |
567 | u_int type, expected_id, count, id; | |
568 | char *filename, *longname; | |
569 | Attrib *a; | |
570 | ||
571 | expected_id = id = conn->msg_id++; | |
572 | send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, | |
573 | strlen(path)); | |
574 | ||
575 | buffer_init(&msg); | |
576 | ||
577 | get_msg(conn->fd_in, &msg); | |
578 | type = buffer_get_char(&msg); | |
579 | id = buffer_get_int(&msg); | |
580 | ||
581 | if (id != expected_id) | |
582 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
583 | ||
584 | if (type == SSH2_FXP_STATUS) { | |
585 | u_int status = buffer_get_int(&msg); | |
586 | ||
587 | error("Couldn't canonicalise: %s", fx2txt(status)); | |
588 | return(NULL); | |
589 | } else if (type != SSH2_FXP_NAME) | |
590 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
591 | SSH2_FXP_NAME, type); | |
592 | ||
593 | count = buffer_get_int(&msg); | |
594 | if (count != 1) | |
595 | fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); | |
596 | ||
597 | filename = buffer_get_string(&msg, NULL); | |
598 | longname = buffer_get_string(&msg, NULL); | |
599 | a = decode_attrib(&msg); | |
600 | ||
601 | debug3("SSH_FXP_REALPATH %s -> %s", path, filename); | |
602 | ||
603 | xfree(longname); | |
604 | ||
605 | buffer_free(&msg); | |
606 | ||
607 | return(filename); | |
608 | } | |
609 | ||
610 | int | |
611 | do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) | |
612 | { | |
613 | Buffer msg; | |
614 | u_int status, id; | |
615 | ||
616 | buffer_init(&msg); | |
617 | ||
618 | /* Send rename request */ | |
619 | id = conn->msg_id++; | |
620 | buffer_put_char(&msg, SSH2_FXP_RENAME); | |
621 | buffer_put_int(&msg, id); | |
622 | buffer_put_cstring(&msg, oldpath); | |
623 | buffer_put_cstring(&msg, newpath); | |
624 | send_msg(conn->fd_out, &msg); | |
625 | debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, | |
626 | newpath); | |
627 | buffer_free(&msg); | |
628 | ||
629 | status = get_status(conn->fd_in, id); | |
630 | if (status != SSH2_FX_OK) | |
631 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
632 | newpath, fx2txt(status)); | |
633 | ||
634 | return(status); | |
635 | } | |
636 | ||
637 | int | |
638 | do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) | |
639 | { | |
640 | Buffer msg; | |
641 | u_int status, id; | |
642 | ||
643 | if (conn->version < 3) { | |
644 | error("This server does not support the symlink operation"); | |
645 | return(SSH2_FX_OP_UNSUPPORTED); | |
646 | } | |
647 | ||
648 | buffer_init(&msg); | |
649 | ||
650 | /* Send rename request */ | |
651 | id = conn->msg_id++; | |
652 | buffer_put_char(&msg, SSH2_FXP_SYMLINK); | |
653 | buffer_put_int(&msg, id); | |
654 | buffer_put_cstring(&msg, oldpath); | |
655 | buffer_put_cstring(&msg, newpath); | |
656 | send_msg(conn->fd_out, &msg); | |
657 | debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, | |
658 | newpath); | |
659 | buffer_free(&msg); | |
660 | ||
661 | status = get_status(conn->fd_in, id); | |
662 | if (status != SSH2_FX_OK) | |
663 | error("Couldn't symlink file \"%s\" to \"%s\": %s", oldpath, | |
664 | newpath, fx2txt(status)); | |
665 | ||
666 | return(status); | |
667 | } | |
668 | ||
669 | char * | |
670 | do_readlink(struct sftp_conn *conn, char *path) | |
671 | { | |
672 | Buffer msg; | |
673 | u_int type, expected_id, count, id; | |
674 | char *filename, *longname; | |
675 | Attrib *a; | |
676 | ||
677 | expected_id = id = conn->msg_id++; | |
678 | send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, | |
679 | strlen(path)); | |
680 | ||
681 | buffer_init(&msg); | |
682 | ||
683 | get_msg(conn->fd_in, &msg); | |
684 | type = buffer_get_char(&msg); | |
685 | id = buffer_get_int(&msg); | |
686 | ||
687 | if (id != expected_id) | |
688 | fatal("ID mismatch (%u != %u)", id, expected_id); | |
689 | ||
690 | if (type == SSH2_FXP_STATUS) { | |
691 | u_int status = buffer_get_int(&msg); | |
692 | ||
693 | error("Couldn't readlink: %s", fx2txt(status)); | |
694 | return(NULL); | |
695 | } else if (type != SSH2_FXP_NAME) | |
696 | fatal("Expected SSH2_FXP_NAME(%u) packet, got %u", | |
697 | SSH2_FXP_NAME, type); | |
698 | ||
699 | count = buffer_get_int(&msg); | |
700 | if (count != 1) | |
701 | fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); | |
702 | ||
703 | filename = buffer_get_string(&msg, NULL); | |
704 | longname = buffer_get_string(&msg, NULL); | |
705 | a = decode_attrib(&msg); | |
706 | ||
707 | debug3("SSH_FXP_READLINK %s -> %s", path, filename); | |
708 | ||
709 | xfree(longname); | |
710 | ||
711 | buffer_free(&msg); | |
712 | ||
713 | return(filename); | |
714 | } | |
715 | ||
716 | static void | |
717 | send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, | |
718 | char *handle, u_int handle_len) | |
719 | { | |
720 | Buffer msg; | |
721 | ||
722 | buffer_init(&msg); | |
723 | buffer_clear(&msg); | |
724 | buffer_put_char(&msg, SSH2_FXP_READ); | |
725 | buffer_put_int(&msg, id); | |
726 | buffer_put_string(&msg, handle, handle_len); | |
727 | buffer_put_int64(&msg, offset); | |
728 | buffer_put_int(&msg, len); | |
729 | send_msg(fd_out, &msg); | |
730 | buffer_free(&msg); | |
731 | } | |
732 | ||
733 | int | |
734 | do_download(struct sftp_conn *conn, char *remote_path, char *local_path, | |
735 | int pflag) | |
736 | { | |
737 | Attrib junk, *a; | |
738 | Buffer msg; | |
739 | char *handle; | |
740 | int local_fd, status, num_req, max_req, write_error; | |
741 | int read_error, write_errno; | |
742 | u_int64_t offset, size; | |
743 | u_int handle_len, mode, type, id, buflen; | |
744 | struct request { | |
745 | u_int id; | |
746 | u_int len; | |
747 | u_int64_t offset; | |
748 | TAILQ_ENTRY(request) tq; | |
749 | }; | |
750 | TAILQ_HEAD(reqhead, request) requests; | |
751 | struct request *req; | |
752 | ||
753 | TAILQ_INIT(&requests); | |
754 | ||
755 | a = do_stat(conn, remote_path, 0); | |
756 | if (a == NULL) | |
757 | return(-1); | |
758 | ||
759 | /* XXX: should we preserve set[ug]id? */ | |
760 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) | |
761 | mode = a->perm & 0777; | |
762 | else | |
763 | mode = 0666; | |
764 | ||
765 | if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && | |
766 | (a->perm & S_IFDIR)) { | |
767 | error("Cannot download a directory: %s", remote_path); | |
768 | return(-1); | |
769 | } | |
770 | ||
771 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) | |
772 | size = a->size; | |
773 | else | |
774 | size = 0; | |
775 | ||
776 | buflen = conn->transfer_buflen; | |
777 | buffer_init(&msg); | |
778 | ||
779 | /* Send open request */ | |
780 | id = conn->msg_id++; | |
781 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
782 | buffer_put_int(&msg, id); | |
783 | buffer_put_cstring(&msg, remote_path); | |
784 | buffer_put_int(&msg, SSH2_FXF_READ); | |
785 | attrib_clear(&junk); /* Send empty attributes */ | |
786 | encode_attrib(&msg, &junk); | |
787 | send_msg(conn->fd_out, &msg); | |
788 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
789 | ||
790 | handle = get_handle(conn->fd_in, id, &handle_len); | |
791 | if (handle == NULL) { | |
792 | buffer_free(&msg); | |
793 | return(-1); | |
794 | } | |
795 | ||
796 | local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, | |
797 | mode | S_IWRITE); | |
798 | if (local_fd == -1) { | |
799 | error("Couldn't open local file \"%s\" for writing: %s", | |
800 | local_path, strerror(errno)); | |
801 | buffer_free(&msg); | |
802 | xfree(handle); | |
803 | return(-1); | |
804 | } | |
805 | ||
806 | /* Read from remote and write to local */ | |
807 | write_error = read_error = write_errno = num_req = offset = 0; | |
808 | max_req = 1; | |
809 | while (num_req > 0 || max_req > 0) { | |
810 | char *data; | |
811 | u_int len; | |
812 | ||
813 | /* Send some more requests */ | |
814 | while (num_req < max_req) { | |
815 | debug3("Request range %llu -> %llu (%d/%d)", | |
816 | (unsigned long long)offset, | |
817 | (unsigned long long)offset + buflen - 1, | |
818 | num_req, max_req); | |
819 | req = xmalloc(sizeof(*req)); | |
820 | req->id = conn->msg_id++; | |
821 | req->len = buflen; | |
822 | req->offset = offset; | |
823 | offset += buflen; | |
824 | num_req++; | |
825 | TAILQ_INSERT_TAIL(&requests, req, tq); | |
826 | send_read_request(conn->fd_out, req->id, req->offset, | |
827 | req->len, handle, handle_len); | |
828 | } | |
829 | ||
830 | buffer_clear(&msg); | |
831 | get_msg(conn->fd_in, &msg); | |
832 | type = buffer_get_char(&msg); | |
833 | id = buffer_get_int(&msg); | |
834 | debug3("Received reply T:%u I:%u R:%d", type, id, max_req); | |
835 | ||
836 | /* Find the request in our queue */ | |
837 | for(req = TAILQ_FIRST(&requests); | |
838 | req != NULL && req->id != id; | |
839 | req = TAILQ_NEXT(req, tq)) | |
840 | ; | |
841 | if (req == NULL) | |
842 | fatal("Unexpected reply %u", id); | |
843 | ||
844 | switch (type) { | |
845 | case SSH2_FXP_STATUS: | |
846 | status = buffer_get_int(&msg); | |
847 | if (status != SSH2_FX_EOF) | |
848 | read_error = 1; | |
849 | max_req = 0; | |
850 | TAILQ_REMOVE(&requests, req, tq); | |
851 | xfree(req); | |
852 | num_req--; | |
853 | break; | |
854 | case SSH2_FXP_DATA: | |
855 | data = buffer_get_string(&msg, &len); | |
856 | debug3("Received data %llu -> %llu", | |
857 | (unsigned long long)req->offset, | |
858 | (unsigned long long)req->offset + len - 1); | |
859 | if (len > req->len) | |
860 | fatal("Received more data than asked for " | |
861 | "%u > %u", len, req->len); | |
862 | if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || | |
863 | atomicio(write, local_fd, data, len) != len) && | |
864 | !write_error) { | |
865 | write_errno = errno; | |
866 | write_error = 1; | |
867 | max_req = 0; | |
868 | } | |
869 | xfree(data); | |
870 | ||
871 | if (len == req->len) { | |
872 | TAILQ_REMOVE(&requests, req, tq); | |
873 | xfree(req); | |
874 | num_req--; | |
875 | } else { | |
876 | /* Resend the request for the missing data */ | |
877 | debug3("Short data block, re-requesting " | |
878 | "%llu -> %llu (%2d)", | |
879 | (unsigned long long)req->offset + len, | |
880 | (unsigned long long)req->offset + | |
881 | req->len - 1, num_req); | |
882 | req->id = conn->msg_id++; | |
883 | req->len -= len; | |
884 | req->offset += len; | |
885 | send_read_request(conn->fd_out, req->id, | |
886 | req->offset, req->len, handle, handle_len); | |
887 | /* Reduce the request size */ | |
888 | if (len < buflen) | |
889 | buflen = MAX(MIN_READ_SIZE, len); | |
890 | } | |
891 | if (max_req > 0) { /* max_req = 0 iff EOF received */ | |
892 | if (size > 0 && offset > size) { | |
893 | /* Only one request at a time | |
894 | * after the expected EOF */ | |
895 | debug3("Finish at %llu (%2d)", | |
896 | (unsigned long long)offset, | |
897 | num_req); | |
898 | max_req = 1; | |
899 | } | |
900 | else if (max_req < conn->num_requests + 1) { | |
901 | ++max_req; | |
902 | } | |
903 | } | |
904 | break; | |
905 | default: | |
906 | fatal("Expected SSH2_FXP_DATA(%u) packet, got %u", | |
907 | SSH2_FXP_DATA, type); | |
908 | } | |
909 | } | |
910 | ||
911 | /* Sanity check */ | |
912 | if (TAILQ_FIRST(&requests) != NULL) | |
913 | fatal("Transfer complete, but requests still in queue"); | |
914 | ||
915 | if (read_error) { | |
916 | error("Couldn't read from remote file \"%s\" : %s", | |
917 | remote_path, fx2txt(status)); | |
918 | do_close(conn, handle, handle_len); | |
919 | } else if (write_error) { | |
920 | error("Couldn't write to \"%s\": %s", local_path, | |
921 | strerror(write_errno)); | |
922 | status = -1; | |
923 | do_close(conn, handle, handle_len); | |
924 | } else { | |
925 | status = do_close(conn, handle, handle_len); | |
926 | ||
927 | /* Override umask and utimes if asked */ | |
928 | #ifdef HAVE_FCHMOD | |
929 | if (pflag && fchmod(local_fd, mode) == -1) | |
930 | #else | |
931 | if (pflag && chmod(local_path, mode) == -1) | |
932 | #endif /* HAVE_FCHMOD */ | |
933 | error("Couldn't set mode on \"%s\": %s", local_path, | |
934 | strerror(errno)); | |
935 | if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { | |
936 | struct timeval tv[2]; | |
937 | tv[0].tv_sec = a->atime; | |
938 | tv[1].tv_sec = a->mtime; | |
939 | tv[0].tv_usec = tv[1].tv_usec = 0; | |
940 | if (utimes(local_path, tv) == -1) | |
941 | error("Can't set times on \"%s\": %s", | |
942 | local_path, strerror(errno)); | |
943 | } | |
944 | } | |
945 | close(local_fd); | |
946 | buffer_free(&msg); | |
947 | xfree(handle); | |
948 | ||
949 | return(status); | |
950 | } | |
951 | ||
952 | int | |
953 | do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, | |
954 | int pflag) | |
955 | { | |
956 | int local_fd, status; | |
957 | u_int handle_len, id, type; | |
958 | u_int64_t offset; | |
959 | char *handle, *data; | |
960 | Buffer msg; | |
961 | struct stat sb; | |
962 | Attrib a; | |
963 | u_int32_t startid; | |
964 | u_int32_t ackid; | |
965 | struct outstanding_ack { | |
966 | u_int id; | |
967 | u_int len; | |
968 | u_int64_t offset; | |
969 | TAILQ_ENTRY(outstanding_ack) tq; | |
970 | }; | |
971 | TAILQ_HEAD(ackhead, outstanding_ack) acks; | |
972 | struct outstanding_ack *ack; | |
973 | ||
974 | TAILQ_INIT(&acks); | |
975 | ||
976 | if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { | |
977 | error("Couldn't open local file \"%s\" for reading: %s", | |
978 | local_path, strerror(errno)); | |
979 | return(-1); | |
980 | } | |
981 | if (fstat(local_fd, &sb) == -1) { | |
982 | error("Couldn't fstat local file \"%s\": %s", | |
983 | local_path, strerror(errno)); | |
984 | close(local_fd); | |
985 | return(-1); | |
986 | } | |
987 | stat_to_attrib(&sb, &a); | |
988 | ||
989 | a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; | |
990 | a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; | |
991 | a.perm &= 0777; | |
992 | if (!pflag) | |
993 | a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; | |
994 | ||
995 | buffer_init(&msg); | |
996 | ||
997 | /* Send open request */ | |
998 | id = conn->msg_id++; | |
999 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
1000 | buffer_put_int(&msg, id); | |
1001 | buffer_put_cstring(&msg, remote_path); | |
1002 | buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); | |
1003 | encode_attrib(&msg, &a); | |
1004 | send_msg(conn->fd_out, &msg); | |
1005 | debug3("Sent message SSH2_FXP_OPEN I:%u P:%s", id, remote_path); | |
1006 | ||
1007 | buffer_clear(&msg); | |
1008 | ||
1009 | handle = get_handle(conn->fd_in, id, &handle_len); | |
1010 | if (handle == NULL) { | |
1011 | close(local_fd); | |
1012 | buffer_free(&msg); | |
1013 | return(-1); | |
1014 | } | |
1015 | ||
1016 | startid = ackid = id + 1; | |
1017 | data = xmalloc(conn->transfer_buflen); | |
1018 | ||
1019 | /* Read from local and write to remote */ | |
1020 | offset = 0; | |
1021 | for (;;) { | |
1022 | int len; | |
1023 | ||
1024 | /* | |
1025 | * Can't use atomicio here because it returns 0 on EOF, thus losing | |
1026 | * the last block of the file | |
1027 | */ | |
1028 | do | |
1029 | len = read(local_fd, data, conn->transfer_buflen); | |
1030 | while ((len == -1) && (errno == EINTR || errno == EAGAIN)); | |
1031 | ||
1032 | if (len == -1) | |
1033 | fatal("Couldn't read from \"%s\": %s", local_path, | |
1034 | strerror(errno)); | |
1035 | ||
1036 | if (len != 0) { | |
1037 | ack = xmalloc(sizeof(*ack)); | |
1038 | ack->id = ++id; | |
1039 | ack->offset = offset; | |
1040 | ack->len = len; | |
1041 | TAILQ_INSERT_TAIL(&acks, ack, tq); | |
1042 | ||
1043 | buffer_clear(&msg); | |
1044 | buffer_put_char(&msg, SSH2_FXP_WRITE); | |
1045 | buffer_put_int(&msg, ack->id); | |
1046 | buffer_put_string(&msg, handle, handle_len); | |
1047 | buffer_put_int64(&msg, offset); | |
1048 | buffer_put_string(&msg, data, len); | |
1049 | send_msg(conn->fd_out, &msg); | |
1050 | debug3("Sent message SSH2_FXP_WRITE I:%u O:%llu S:%u", | |
1051 | id, (unsigned long long)offset, len); | |
1052 | } else if (TAILQ_FIRST(&acks) == NULL) | |
1053 | break; | |
1054 | ||
1055 | if (ack == NULL) | |
1056 | fatal("Unexpected ACK %u", id); | |
1057 | ||
1058 | if (id == startid || len == 0 || | |
1059 | id - ackid >= conn->num_requests) { | |
1060 | u_int r_id; | |
1061 | ||
1062 | buffer_clear(&msg); | |
1063 | get_msg(conn->fd_in, &msg); | |
1064 | type = buffer_get_char(&msg); | |
1065 | r_id = buffer_get_int(&msg); | |
1066 | ||
1067 | if (type != SSH2_FXP_STATUS) | |
1068 | fatal("Expected SSH2_FXP_STATUS(%d) packet, " | |
1069 | "got %d", SSH2_FXP_STATUS, type); | |
1070 | ||
1071 | status = buffer_get_int(&msg); | |
1072 | debug3("SSH2_FXP_STATUS %d", status); | |
1073 | ||
1074 | /* Find the request in our queue */ | |
1075 | for(ack = TAILQ_FIRST(&acks); | |
1076 | ack != NULL && ack->id != r_id; | |
1077 | ack = TAILQ_NEXT(ack, tq)) | |
1078 | ; | |
1079 | if (ack == NULL) | |
1080 | fatal("Can't find request for ID %u", r_id); | |
1081 | TAILQ_REMOVE(&acks, ack, tq); | |
1082 | ||
1083 | if (status != SSH2_FX_OK) { | |
1084 | error("Couldn't write to remote file \"%s\": %s", | |
1085 | remote_path, fx2txt(status)); | |
1086 | do_close(conn, handle, handle_len); | |
1087 | close(local_fd); | |
1088 | goto done; | |
1089 | } | |
1090 | debug3("In write loop, ack for %u %u bytes at %llu", | |
1091 | ack->id, ack->len, (unsigned long long)ack->offset); | |
1092 | ++ackid; | |
1093 | xfree(ack); | |
1094 | } | |
1095 | offset += len; | |
1096 | } | |
1097 | xfree(data); | |
1098 | ||
1099 | if (close(local_fd) == -1) { | |
1100 | error("Couldn't close local file \"%s\": %s", local_path, | |
1101 | strerror(errno)); | |
1102 | do_close(conn, handle, handle_len); | |
1103 | status = -1; | |
1104 | goto done; | |
1105 | } | |
1106 | ||
1107 | /* Override umask and utimes if asked */ | |
1108 | if (pflag) | |
1109 | do_fsetstat(conn, handle, handle_len, &a); | |
1110 | ||
1111 | status = do_close(conn, handle, handle_len); | |
1112 | ||
1113 | done: | |
1114 | xfree(handle); | |
1115 | buffer_free(&msg); | |
1116 | return(status); | |
1117 | } |