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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 1.28 2002/03/19 10:49:35 markus Exp $"); | |
32 | ||
33 | #if defined(HAVE_SYS_QUEUE_H) && !defined(HAVE_BOGUS_SYS_QUEUE_H) | |
34 | #include <sys/queue.h> | |
35 | #else | |
36 | #include "openbsd-compat/fake-queue.h" | |
37 | #endif | |
38 | ||
39 | #include "buffer.h" | |
40 | #include "bufaux.h" | |
41 | #include "getput.h" | |
42 | #include "xmalloc.h" | |
43 | #include "log.h" | |
44 | #include "atomicio.h" | |
45 | ||
46 | #include "sftp.h" | |
47 | #include "sftp-common.h" | |
48 | #include "sftp-client.h" | |
49 | ||
50 | /* Minimum amount of data to read at at time */ | |
51 | #define MIN_READ_SIZE 512 | |
52 | ||
53 | struct sftp_conn { | |
54 | int fd_in; | |
55 | int fd_out; | |
56 | u_int transfer_buflen; | |
57 | u_int num_requests; | |
58 | u_int version; | |
59 | u_int msg_id; | |
60 | }; | |
61 | ||
62 | static void | |
63 | send_msg(int fd, Buffer *m) | |
64 | { | |
65 | int mlen = buffer_len(m); | |
66 | int len; | |
67 | Buffer oqueue; | |
68 | ||
69 | buffer_init(&oqueue); | |
70 | buffer_put_int(&oqueue, mlen); | |
71 | buffer_append(&oqueue, buffer_ptr(m), mlen); | |
72 | buffer_consume(m, mlen); | |
73 | ||
74 | len = atomicio(write, fd, buffer_ptr(&oqueue), buffer_len(&oqueue)); | |
75 | if (len <= 0) | |
76 | fatal("Couldn't send packet: %s", strerror(errno)); | |
77 | ||
78 | buffer_free(&oqueue); | |
79 | } | |
80 | ||
81 | static void | |
82 | get_msg(int fd, Buffer *m) | |
83 | { | |
84 | u_int len, msg_len; | |
85 | unsigned char buf[4096]; | |
86 | ||
87 | len = atomicio(read, fd, buf, 4); | |
88 | if (len == 0) | |
89 | fatal("Connection closed"); | |
90 | else if (len == -1) | |
91 | fatal("Couldn't read packet: %s", strerror(errno)); | |
92 | ||
93 | msg_len = GET_32BIT(buf); | |
94 | if (msg_len > 256 * 1024) | |
95 | fatal("Received message too long %d", msg_len); | |
96 | ||
97 | while (msg_len) { | |
98 | len = atomicio(read, fd, buf, MIN(msg_len, sizeof(buf))); | |
99 | if (len == 0) | |
100 | fatal("Connection closed"); | |
101 | else if (len == -1) | |
102 | fatal("Couldn't read packet: %s", strerror(errno)); | |
103 | ||
104 | msg_len -= len; | |
105 | buffer_append(m, buf, len); | |
106 | } | |
107 | } | |
108 | ||
109 | static void | |
110 | send_string_request(int fd, u_int id, u_int code, char *s, | |
111 | u_int len) | |
112 | { | |
113 | Buffer msg; | |
114 | ||
115 | buffer_init(&msg); | |
116 | buffer_put_char(&msg, code); | |
117 | buffer_put_int(&msg, id); | |
118 | buffer_put_string(&msg, s, len); | |
119 | send_msg(fd, &msg); | |
120 | debug3("Sent message fd %d T:%d I:%d", fd, code, id); | |
121 | buffer_free(&msg); | |
122 | } | |
123 | ||
124 | static void | |
125 | send_string_attrs_request(int fd, u_int id, u_int code, char *s, | |
126 | u_int len, Attrib *a) | |
127 | { | |
128 | Buffer msg; | |
129 | ||
130 | buffer_init(&msg); | |
131 | buffer_put_char(&msg, code); | |
132 | buffer_put_int(&msg, id); | |
133 | buffer_put_string(&msg, s, len); | |
134 | encode_attrib(&msg, a); | |
135 | send_msg(fd, &msg); | |
136 | debug3("Sent message fd %d T:%d I:%d", fd, code, id); | |
137 | buffer_free(&msg); | |
138 | } | |
139 | ||
140 | static u_int | |
141 | get_status(int fd, int expected_id) | |
142 | { | |
143 | Buffer msg; | |
144 | u_int type, id, status; | |
145 | ||
146 | buffer_init(&msg); | |
147 | get_msg(fd, &msg); | |
148 | type = buffer_get_char(&msg); | |
149 | id = buffer_get_int(&msg); | |
150 | ||
151 | if (id != expected_id) | |
152 | fatal("ID mismatch (%d != %d)", id, expected_id); | |
153 | if (type != SSH2_FXP_STATUS) | |
154 | fatal("Expected SSH2_FXP_STATUS(%d) packet, got %d", | |
155 | SSH2_FXP_STATUS, type); | |
156 | ||
157 | status = buffer_get_int(&msg); | |
158 | buffer_free(&msg); | |
159 | ||
160 | debug3("SSH2_FXP_STATUS %d", status); | |
161 | ||
162 | return(status); | |
163 | } | |
164 | ||
165 | static char * | |
166 | get_handle(int fd, u_int expected_id, u_int *len) | |
167 | { | |
168 | Buffer msg; | |
169 | u_int type, id; | |
170 | char *handle; | |
171 | ||
172 | buffer_init(&msg); | |
173 | get_msg(fd, &msg); | |
174 | type = buffer_get_char(&msg); | |
175 | id = buffer_get_int(&msg); | |
176 | ||
177 | if (id != expected_id) | |
178 | fatal("ID mismatch (%d != %d)", id, expected_id); | |
179 | if (type == SSH2_FXP_STATUS) { | |
180 | int status = buffer_get_int(&msg); | |
181 | ||
182 | error("Couldn't get handle: %s", fx2txt(status)); | |
183 | return(NULL); | |
184 | } else if (type != SSH2_FXP_HANDLE) | |
185 | fatal("Expected SSH2_FXP_HANDLE(%d) packet, got %d", | |
186 | SSH2_FXP_HANDLE, type); | |
187 | ||
188 | handle = buffer_get_string(&msg, len); | |
189 | buffer_free(&msg); | |
190 | ||
191 | return(handle); | |
192 | } | |
193 | ||
194 | static Attrib * | |
195 | get_decode_stat(int fd, u_int expected_id, int quiet) | |
196 | { | |
197 | Buffer msg; | |
198 | u_int type, id; | |
199 | Attrib *a; | |
200 | ||
201 | buffer_init(&msg); | |
202 | get_msg(fd, &msg); | |
203 | ||
204 | type = buffer_get_char(&msg); | |
205 | id = buffer_get_int(&msg); | |
206 | ||
207 | debug3("Received stat reply T:%d I:%d", type, id); | |
208 | if (id != expected_id) | |
209 | fatal("ID mismatch (%d != %d)", id, expected_id); | |
210 | if (type == SSH2_FXP_STATUS) { | |
211 | int status = buffer_get_int(&msg); | |
212 | ||
213 | if (quiet) | |
214 | debug("Couldn't stat remote file: %s", fx2txt(status)); | |
215 | else | |
216 | error("Couldn't stat remote file: %s", fx2txt(status)); | |
217 | return(NULL); | |
218 | } else if (type != SSH2_FXP_ATTRS) { | |
219 | fatal("Expected SSH2_FXP_ATTRS(%d) packet, got %d", | |
220 | SSH2_FXP_ATTRS, type); | |
221 | } | |
222 | a = decode_attrib(&msg); | |
223 | buffer_free(&msg); | |
224 | ||
225 | return(a); | |
226 | } | |
227 | ||
228 | struct sftp_conn * | |
229 | do_init(int fd_in, int fd_out, u_int transfer_buflen, u_int num_requests) | |
230 | { | |
231 | int type, version; | |
232 | Buffer msg; | |
233 | struct sftp_conn *ret; | |
234 | ||
235 | buffer_init(&msg); | |
236 | buffer_put_char(&msg, SSH2_FXP_INIT); | |
237 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
238 | send_msg(fd_out, &msg); | |
239 | ||
240 | buffer_clear(&msg); | |
241 | ||
242 | get_msg(fd_in, &msg); | |
243 | ||
244 | /* Expecting a VERSION reply */ | |
245 | if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) { | |
246 | error("Invalid packet back from SSH2_FXP_INIT (type %d)", | |
247 | type); | |
248 | buffer_free(&msg); | |
249 | return(NULL); | |
250 | } | |
251 | version = buffer_get_int(&msg); | |
252 | ||
253 | debug2("Remote version: %d", version); | |
254 | ||
255 | /* Check for extensions */ | |
256 | while (buffer_len(&msg) > 0) { | |
257 | char *name = buffer_get_string(&msg, NULL); | |
258 | char *value = buffer_get_string(&msg, NULL); | |
259 | ||
260 | debug2("Init extension: \"%s\"", name); | |
261 | xfree(name); | |
262 | xfree(value); | |
263 | } | |
264 | ||
265 | buffer_free(&msg); | |
266 | ||
267 | ret = xmalloc(sizeof(*ret)); | |
268 | ret->fd_in = fd_in; | |
269 | ret->fd_out = fd_out; | |
270 | ret->transfer_buflen = transfer_buflen; | |
271 | ret->num_requests = num_requests; | |
272 | ret->version = version; | |
273 | ret->msg_id = 1; | |
274 | ||
275 | /* Some filexfer v.0 servers don't support large packets */ | |
276 | if (version == 0) | |
277 | ret->transfer_buflen = MAX(ret->transfer_buflen, 20480); | |
278 | ||
279 | return(ret); | |
280 | } | |
281 | ||
282 | u_int | |
283 | sftp_proto_version(struct sftp_conn *conn) | |
284 | { | |
285 | return(conn->version); | |
286 | } | |
287 | ||
288 | int | |
289 | do_close(struct sftp_conn *conn, char *handle, u_int handle_len) | |
290 | { | |
291 | u_int id, status; | |
292 | Buffer msg; | |
293 | ||
294 | buffer_init(&msg); | |
295 | ||
296 | id = conn->msg_id++; | |
297 | buffer_put_char(&msg, SSH2_FXP_CLOSE); | |
298 | buffer_put_int(&msg, id); | |
299 | buffer_put_string(&msg, handle, handle_len); | |
300 | send_msg(conn->fd_out, &msg); | |
301 | debug3("Sent message SSH2_FXP_CLOSE I:%d", id); | |
302 | ||
303 | status = get_status(conn->fd_in, id); | |
304 | if (status != SSH2_FX_OK) | |
305 | error("Couldn't close file: %s", fx2txt(status)); | |
306 | ||
307 | buffer_free(&msg); | |
308 | ||
309 | return(status); | |
310 | } | |
311 | ||
312 | ||
313 | static int | |
314 | do_lsreaddir(struct sftp_conn *conn, char *path, int printflag, | |
315 | SFTP_DIRENT ***dir) | |
316 | { | |
317 | Buffer msg; | |
318 | u_int type, id, handle_len, i, expected_id, ents = 0; | |
319 | char *handle; | |
320 | ||
321 | id = conn->msg_id++; | |
322 | ||
323 | buffer_init(&msg); | |
324 | buffer_put_char(&msg, SSH2_FXP_OPENDIR); | |
325 | buffer_put_int(&msg, id); | |
326 | buffer_put_cstring(&msg, path); | |
327 | send_msg(conn->fd_out, &msg); | |
328 | ||
329 | buffer_clear(&msg); | |
330 | ||
331 | handle = get_handle(conn->fd_in, id, &handle_len); | |
332 | if (handle == NULL) | |
333 | return(-1); | |
334 | ||
335 | if (dir) { | |
336 | ents = 0; | |
337 | *dir = xmalloc(sizeof(**dir)); | |
338 | (*dir)[0] = NULL; | |
339 | } | |
340 | ||
341 | for (;;) { | |
342 | int count; | |
343 | ||
344 | id = expected_id = conn->msg_id++; | |
345 | ||
346 | debug3("Sending SSH2_FXP_READDIR I:%d", id); | |
347 | ||
348 | buffer_clear(&msg); | |
349 | buffer_put_char(&msg, SSH2_FXP_READDIR); | |
350 | buffer_put_int(&msg, id); | |
351 | buffer_put_string(&msg, handle, handle_len); | |
352 | send_msg(conn->fd_out, &msg); | |
353 | ||
354 | buffer_clear(&msg); | |
355 | ||
356 | get_msg(conn->fd_in, &msg); | |
357 | ||
358 | type = buffer_get_char(&msg); | |
359 | id = buffer_get_int(&msg); | |
360 | ||
361 | debug3("Received reply T:%d I:%d", type, id); | |
362 | ||
363 | if (id != expected_id) | |
364 | fatal("ID mismatch (%d != %d)", id, expected_id); | |
365 | ||
366 | if (type == SSH2_FXP_STATUS) { | |
367 | int status = buffer_get_int(&msg); | |
368 | ||
369 | debug3("Received SSH2_FXP_STATUS %d", status); | |
370 | ||
371 | if (status == SSH2_FX_EOF) { | |
372 | break; | |
373 | } else { | |
374 | error("Couldn't read directory: %s", | |
375 | fx2txt(status)); | |
376 | do_close(conn, handle, handle_len); | |
377 | return(status); | |
378 | } | |
379 | } else if (type != SSH2_FXP_NAME) | |
380 | fatal("Expected SSH2_FXP_NAME(%d) packet, got %d", | |
381 | SSH2_FXP_NAME, type); | |
382 | ||
383 | count = buffer_get_int(&msg); | |
384 | if (count == 0) | |
385 | break; | |
386 | debug3("Received %d SSH2_FXP_NAME responses", count); | |
387 | for (i = 0; i < count; i++) { | |
388 | char *filename, *longname; | |
389 | Attrib *a; | |
390 | ||
391 | filename = buffer_get_string(&msg, NULL); | |
392 | longname = buffer_get_string(&msg, NULL); | |
393 | a = decode_attrib(&msg); | |
394 | ||
395 | if (printflag) | |
396 | printf("%s\n", longname); | |
397 | ||
398 | if (dir) { | |
399 | *dir = xrealloc(*dir, sizeof(**dir) * | |
400 | (ents + 2)); | |
401 | (*dir)[ents] = xmalloc(sizeof(***dir)); | |
402 | (*dir)[ents]->filename = xstrdup(filename); | |
403 | (*dir)[ents]->longname = xstrdup(longname); | |
404 | memcpy(&(*dir)[ents]->a, a, sizeof(*a)); | |
405 | (*dir)[++ents] = NULL; | |
406 | } | |
407 | ||
408 | xfree(filename); | |
409 | xfree(longname); | |
410 | } | |
411 | } | |
412 | ||
413 | buffer_free(&msg); | |
414 | do_close(conn, handle, handle_len); | |
415 | xfree(handle); | |
416 | ||
417 | return(0); | |
418 | } | |
419 | ||
420 | int | |
421 | do_ls(struct sftp_conn *conn, char *path) | |
422 | { | |
423 | return(do_lsreaddir(conn, path, 1, NULL)); | |
424 | } | |
425 | ||
426 | int | |
427 | do_readdir(struct sftp_conn *conn, char *path, SFTP_DIRENT ***dir) | |
428 | { | |
429 | return(do_lsreaddir(conn, path, 0, dir)); | |
430 | } | |
431 | ||
432 | void free_sftp_dirents(SFTP_DIRENT **s) | |
433 | { | |
434 | int i; | |
435 | ||
436 | for (i = 0; s[i]; i++) { | |
437 | xfree(s[i]->filename); | |
438 | xfree(s[i]->longname); | |
439 | xfree(s[i]); | |
440 | } | |
441 | xfree(s); | |
442 | } | |
443 | ||
444 | int | |
445 | do_rm(struct sftp_conn *conn, char *path) | |
446 | { | |
447 | u_int status, id; | |
448 | ||
449 | debug2("Sending SSH2_FXP_REMOVE \"%s\"", path); | |
450 | ||
451 | id = conn->msg_id++; | |
452 | send_string_request(conn->fd_out, id, SSH2_FXP_REMOVE, path, | |
453 | strlen(path)); | |
454 | status = get_status(conn->fd_in, id); | |
455 | if (status != SSH2_FX_OK) | |
456 | error("Couldn't delete file: %s", fx2txt(status)); | |
457 | return(status); | |
458 | } | |
459 | ||
460 | int | |
461 | do_mkdir(struct sftp_conn *conn, char *path, Attrib *a) | |
462 | { | |
463 | u_int status, id; | |
464 | ||
465 | id = conn->msg_id++; | |
466 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_MKDIR, path, | |
467 | strlen(path), a); | |
468 | ||
469 | status = get_status(conn->fd_in, id); | |
470 | if (status != SSH2_FX_OK) | |
471 | error("Couldn't create directory: %s", fx2txt(status)); | |
472 | ||
473 | return(status); | |
474 | } | |
475 | ||
476 | int | |
477 | do_rmdir(struct sftp_conn *conn, char *path) | |
478 | { | |
479 | u_int status, id; | |
480 | ||
481 | id = conn->msg_id++; | |
482 | send_string_request(conn->fd_out, id, SSH2_FXP_RMDIR, path, | |
483 | strlen(path)); | |
484 | ||
485 | status = get_status(conn->fd_in, id); | |
486 | if (status != SSH2_FX_OK) | |
487 | error("Couldn't remove directory: %s", fx2txt(status)); | |
488 | ||
489 | return(status); | |
490 | } | |
491 | ||
492 | Attrib * | |
493 | do_stat(struct sftp_conn *conn, char *path, int quiet) | |
494 | { | |
495 | u_int id; | |
496 | ||
497 | id = conn->msg_id++; | |
498 | ||
499 | send_string_request(conn->fd_out, id, | |
500 | conn->version == 0 ? SSH2_FXP_STAT_VERSION_0 : SSH2_FXP_STAT, | |
501 | path, strlen(path)); | |
502 | ||
503 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
504 | } | |
505 | ||
506 | Attrib * | |
507 | do_lstat(struct sftp_conn *conn, char *path, int quiet) | |
508 | { | |
509 | u_int id; | |
510 | ||
511 | if (conn->version == 0) { | |
512 | if (quiet) | |
513 | debug("Server version does not support lstat operation"); | |
514 | else | |
515 | error("Server version does not support lstat operation"); | |
516 | return(NULL); | |
517 | } | |
518 | ||
519 | id = conn->msg_id++; | |
520 | send_string_request(conn->fd_out, id, SSH2_FXP_LSTAT, path, | |
521 | strlen(path)); | |
522 | ||
523 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
524 | } | |
525 | ||
526 | Attrib * | |
527 | do_fstat(struct sftp_conn *conn, char *handle, u_int handle_len, int quiet) | |
528 | { | |
529 | u_int id; | |
530 | ||
531 | id = conn->msg_id++; | |
532 | send_string_request(conn->fd_out, id, SSH2_FXP_FSTAT, handle, | |
533 | handle_len); | |
534 | ||
535 | return(get_decode_stat(conn->fd_in, id, quiet)); | |
536 | } | |
537 | ||
538 | int | |
539 | do_setstat(struct sftp_conn *conn, char *path, Attrib *a) | |
540 | { | |
541 | u_int status, id; | |
542 | ||
543 | id = conn->msg_id++; | |
544 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_SETSTAT, path, | |
545 | strlen(path), a); | |
546 | ||
547 | status = get_status(conn->fd_in, id); | |
548 | if (status != SSH2_FX_OK) | |
549 | error("Couldn't setstat on \"%s\": %s", path, | |
550 | fx2txt(status)); | |
551 | ||
552 | return(status); | |
553 | } | |
554 | ||
555 | int | |
556 | do_fsetstat(struct sftp_conn *conn, char *handle, u_int handle_len, | |
557 | Attrib *a) | |
558 | { | |
559 | u_int status, id; | |
560 | ||
561 | id = conn->msg_id++; | |
562 | send_string_attrs_request(conn->fd_out, id, SSH2_FXP_FSETSTAT, handle, | |
563 | handle_len, a); | |
564 | ||
565 | status = get_status(conn->fd_in, id); | |
566 | if (status != SSH2_FX_OK) | |
567 | error("Couldn't fsetstat: %s", fx2txt(status)); | |
568 | ||
569 | return(status); | |
570 | } | |
571 | ||
572 | char * | |
573 | do_realpath(struct sftp_conn *conn, char *path) | |
574 | { | |
575 | Buffer msg; | |
576 | u_int type, expected_id, count, id; | |
577 | char *filename, *longname; | |
578 | Attrib *a; | |
579 | ||
580 | expected_id = id = conn->msg_id++; | |
581 | send_string_request(conn->fd_out, id, SSH2_FXP_REALPATH, path, | |
582 | strlen(path)); | |
583 | ||
584 | buffer_init(&msg); | |
585 | ||
586 | get_msg(conn->fd_in, &msg); | |
587 | type = buffer_get_char(&msg); | |
588 | id = buffer_get_int(&msg); | |
589 | ||
590 | if (id != expected_id) | |
591 | fatal("ID mismatch (%d != %d)", id, expected_id); | |
592 | ||
593 | if (type == SSH2_FXP_STATUS) { | |
594 | u_int status = buffer_get_int(&msg); | |
595 | ||
596 | error("Couldn't canonicalise: %s", fx2txt(status)); | |
597 | return(NULL); | |
598 | } else if (type != SSH2_FXP_NAME) | |
599 | fatal("Expected SSH2_FXP_NAME(%d) packet, got %d", | |
600 | SSH2_FXP_NAME, type); | |
601 | ||
602 | count = buffer_get_int(&msg); | |
603 | if (count != 1) | |
604 | fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count); | |
605 | ||
606 | filename = buffer_get_string(&msg, NULL); | |
607 | longname = buffer_get_string(&msg, NULL); | |
608 | a = decode_attrib(&msg); | |
609 | ||
610 | debug3("SSH_FXP_REALPATH %s -> %s", path, filename); | |
611 | ||
612 | xfree(longname); | |
613 | ||
614 | buffer_free(&msg); | |
615 | ||
616 | return(filename); | |
617 | } | |
618 | ||
619 | int | |
620 | do_rename(struct sftp_conn *conn, char *oldpath, char *newpath) | |
621 | { | |
622 | Buffer msg; | |
623 | u_int status, id; | |
624 | ||
625 | buffer_init(&msg); | |
626 | ||
627 | /* Send rename request */ | |
628 | id = conn->msg_id++; | |
629 | buffer_put_char(&msg, SSH2_FXP_RENAME); | |
630 | buffer_put_int(&msg, id); | |
631 | buffer_put_cstring(&msg, oldpath); | |
632 | buffer_put_cstring(&msg, newpath); | |
633 | send_msg(conn->fd_out, &msg); | |
634 | debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath, | |
635 | newpath); | |
636 | buffer_free(&msg); | |
637 | ||
638 | status = get_status(conn->fd_in, id); | |
639 | if (status != SSH2_FX_OK) | |
640 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
641 | newpath, fx2txt(status)); | |
642 | ||
643 | return(status); | |
644 | } | |
645 | ||
646 | int | |
647 | do_symlink(struct sftp_conn *conn, char *oldpath, char *newpath) | |
648 | { | |
649 | Buffer msg; | |
650 | u_int status, id; | |
651 | ||
652 | if (conn->version < 3) { | |
653 | error("This server does not support the symlink operation"); | |
654 | return(SSH2_FX_OP_UNSUPPORTED); | |
655 | } | |
656 | ||
657 | buffer_init(&msg); | |
658 | ||
659 | /* Send rename request */ | |
660 | id = conn->msg_id++; | |
661 | buffer_put_char(&msg, SSH2_FXP_SYMLINK); | |
662 | buffer_put_int(&msg, id); | |
663 | buffer_put_cstring(&msg, oldpath); | |
664 | buffer_put_cstring(&msg, newpath); | |
665 | send_msg(conn->fd_out, &msg); | |
666 | debug3("Sent message SSH2_FXP_SYMLINK \"%s\" -> \"%s\"", oldpath, | |
667 | newpath); | |
668 | buffer_free(&msg); | |
669 | ||
670 | status = get_status(conn->fd_in, id); | |
671 | if (status != SSH2_FX_OK) | |
672 | error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, | |
673 | newpath, fx2txt(status)); | |
674 | ||
675 | return(status); | |
676 | } | |
677 | ||
678 | char * | |
679 | do_readlink(struct sftp_conn *conn, char *path) | |
680 | { | |
681 | Buffer msg; | |
682 | u_int type, expected_id, count, id; | |
683 | char *filename, *longname; | |
684 | Attrib *a; | |
685 | ||
686 | expected_id = id = conn->msg_id++; | |
687 | send_string_request(conn->fd_out, id, SSH2_FXP_READLINK, path, | |
688 | strlen(path)); | |
689 | ||
690 | buffer_init(&msg); | |
691 | ||
692 | get_msg(conn->fd_in, &msg); | |
693 | type = buffer_get_char(&msg); | |
694 | id = buffer_get_int(&msg); | |
695 | ||
696 | if (id != expected_id) | |
697 | fatal("ID mismatch (%d != %d)", id, expected_id); | |
698 | ||
699 | if (type == SSH2_FXP_STATUS) { | |
700 | u_int status = buffer_get_int(&msg); | |
701 | ||
702 | error("Couldn't readlink: %s", fx2txt(status)); | |
703 | return(NULL); | |
704 | } else if (type != SSH2_FXP_NAME) | |
705 | fatal("Expected SSH2_FXP_NAME(%d) packet, got %d", | |
706 | SSH2_FXP_NAME, type); | |
707 | ||
708 | count = buffer_get_int(&msg); | |
709 | if (count != 1) | |
710 | fatal("Got multiple names (%d) from SSH_FXP_READLINK", count); | |
711 | ||
712 | filename = buffer_get_string(&msg, NULL); | |
713 | longname = buffer_get_string(&msg, NULL); | |
714 | a = decode_attrib(&msg); | |
715 | ||
716 | debug3("SSH_FXP_READLINK %s -> %s", path, filename); | |
717 | ||
718 | xfree(longname); | |
719 | ||
720 | buffer_free(&msg); | |
721 | ||
722 | return(filename); | |
723 | } | |
724 | ||
725 | static void | |
726 | send_read_request(int fd_out, u_int id, u_int64_t offset, u_int len, | |
727 | char *handle, u_int handle_len) | |
728 | { | |
729 | Buffer msg; | |
730 | ||
731 | buffer_init(&msg); | |
732 | buffer_clear(&msg); | |
733 | buffer_put_char(&msg, SSH2_FXP_READ); | |
734 | buffer_put_int(&msg, id); | |
735 | buffer_put_string(&msg, handle, handle_len); | |
736 | buffer_put_int64(&msg, offset); | |
737 | buffer_put_int(&msg, len); | |
738 | send_msg(fd_out, &msg); | |
739 | buffer_free(&msg); | |
740 | } | |
741 | ||
742 | int | |
743 | do_download(struct sftp_conn *conn, char *remote_path, char *local_path, | |
744 | int pflag) | |
745 | { | |
746 | Attrib junk, *a; | |
747 | Buffer msg; | |
748 | char *handle; | |
749 | int local_fd, status, num_req, max_req, write_error; | |
750 | int read_error, write_errno; | |
751 | u_int64_t offset, size; | |
752 | u_int handle_len, mode, type, id, buflen; | |
753 | struct request { | |
754 | u_int id; | |
755 | u_int len; | |
756 | u_int64_t offset; | |
757 | TAILQ_ENTRY(request) tq; | |
758 | }; | |
759 | TAILQ_HEAD(reqhead, request) requests; | |
760 | struct request *req; | |
761 | ||
762 | TAILQ_INIT(&requests); | |
763 | ||
764 | a = do_stat(conn, remote_path, 0); | |
765 | if (a == NULL) | |
766 | return(-1); | |
767 | ||
768 | /* XXX: should we preserve set[ug]id? */ | |
769 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) | |
770 | mode = S_IWRITE | (a->perm & 0777); | |
771 | else | |
772 | mode = 0666; | |
773 | ||
774 | if ((a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) && | |
775 | (a->perm & S_IFDIR)) { | |
776 | error("Cannot download a directory: %s", remote_path); | |
777 | return(-1); | |
778 | } | |
779 | ||
780 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) | |
781 | size = a->size; | |
782 | else | |
783 | size = 0; | |
784 | ||
785 | buflen = conn->transfer_buflen; | |
786 | buffer_init(&msg); | |
787 | ||
788 | /* Send open request */ | |
789 | id = conn->msg_id++; | |
790 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
791 | buffer_put_int(&msg, id); | |
792 | buffer_put_cstring(&msg, remote_path); | |
793 | buffer_put_int(&msg, SSH2_FXF_READ); | |
794 | attrib_clear(&junk); /* Send empty attributes */ | |
795 | encode_attrib(&msg, &junk); | |
796 | send_msg(conn->fd_out, &msg); | |
797 | debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path); | |
798 | ||
799 | handle = get_handle(conn->fd_in, id, &handle_len); | |
800 | if (handle == NULL) { | |
801 | buffer_free(&msg); | |
802 | return(-1); | |
803 | } | |
804 | ||
805 | local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode); | |
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 | while (num_req > 0 || max_req > 0) { | |
818 | char *data; | |
819 | u_int len; | |
820 | ||
821 | /* Send some more requests */ | |
822 | while (num_req < max_req) { | |
823 | debug3("Request range %llu -> %llu (%d/%d)", | |
824 | (unsigned long long)offset, | |
825 | (unsigned long long)offset + buflen - 1, | |
826 | num_req, max_req); | |
827 | req = xmalloc(sizeof(*req)); | |
828 | req->id = conn->msg_id++; | |
829 | req->len = buflen; | |
830 | req->offset = offset; | |
831 | offset += buflen; | |
832 | num_req++; | |
833 | TAILQ_INSERT_TAIL(&requests, req, tq); | |
834 | send_read_request(conn->fd_out, req->id, req->offset, | |
835 | req->len, handle, handle_len); | |
836 | } | |
837 | ||
838 | buffer_clear(&msg); | |
839 | get_msg(conn->fd_in, &msg); | |
840 | type = buffer_get_char(&msg); | |
841 | id = buffer_get_int(&msg); | |
842 | debug3("Received reply T:%d I:%d R:%d", type, id, max_req); | |
843 | ||
844 | /* Find the request in our queue */ | |
845 | for(req = TAILQ_FIRST(&requests); | |
846 | req != NULL && req->id != id; | |
847 | req = TAILQ_NEXT(req, tq)) | |
848 | ; | |
849 | if (req == NULL) | |
850 | fatal("Unexpected reply %u", id); | |
851 | ||
852 | switch (type) { | |
853 | case SSH2_FXP_STATUS: | |
854 | status = buffer_get_int(&msg); | |
855 | if (status != SSH2_FX_EOF) | |
856 | read_error = 1; | |
857 | max_req = 0; | |
858 | TAILQ_REMOVE(&requests, req, tq); | |
859 | xfree(req); | |
860 | num_req--; | |
861 | break; | |
862 | case SSH2_FXP_DATA: | |
863 | data = buffer_get_string(&msg, &len); | |
864 | debug3("Received data %llu -> %llu", | |
865 | (unsigned long long)req->offset, | |
866 | (unsigned long long)req->offset + len - 1); | |
867 | if (len > req->len) | |
868 | fatal("Received more data than asked for " | |
869 | "%d > %d", len, req->len); | |
870 | if ((lseek(local_fd, req->offset, SEEK_SET) == -1 || | |
871 | atomicio(write, local_fd, data, len) != len) && | |
872 | !write_error) { | |
873 | write_errno = errno; | |
874 | write_error = 1; | |
875 | max_req = 0; | |
876 | } | |
877 | xfree(data); | |
878 | ||
879 | if (len == req->len) { | |
880 | TAILQ_REMOVE(&requests, req, tq); | |
881 | xfree(req); | |
882 | num_req--; | |
883 | } else { | |
884 | /* Resend the request for the missing data */ | |
885 | debug3("Short data block, re-requesting " | |
886 | "%llu -> %llu (%2d)", | |
887 | (unsigned long long)req->offset + len, | |
888 | (unsigned long long)req->offset + | |
889 | req->len - 1, num_req); | |
890 | req->id = conn->msg_id++; | |
891 | req->len -= len; | |
892 | req->offset += len; | |
893 | send_read_request(conn->fd_out, req->id, | |
894 | req->offset, req->len, handle, handle_len); | |
895 | /* Reduce the request size */ | |
896 | if (len < buflen) | |
897 | buflen = MAX(MIN_READ_SIZE, len); | |
898 | } | |
899 | if (max_req > 0) { /* max_req = 0 iff EOF received */ | |
900 | if (size > 0 && offset > size) { | |
901 | /* Only one request at a time | |
902 | * after the expected EOF */ | |
903 | debug3("Finish at %llu (%2d)", | |
904 | (unsigned long long)offset, | |
905 | num_req); | |
906 | max_req = 1; | |
907 | } | |
908 | else if (max_req < conn->num_requests + 1) { | |
909 | ++max_req; | |
910 | } | |
911 | } | |
912 | break; | |
913 | default: | |
914 | fatal("Expected SSH2_FXP_DATA(%d) packet, got %d", | |
915 | SSH2_FXP_DATA, type); | |
916 | } | |
917 | } | |
918 | ||
919 | /* Sanity check */ | |
920 | if (TAILQ_FIRST(&requests) != NULL) | |
921 | fatal("Transfer complete, but requests still in queue"); | |
922 | ||
923 | if (read_error) { | |
924 | error("Couldn't read from remote file \"%s\" : %s", | |
925 | remote_path, fx2txt(status)); | |
926 | do_close(conn, handle, handle_len); | |
927 | } else if (write_error) { | |
928 | error("Couldn't write to \"%s\": %s", local_path, | |
929 | strerror(write_errno)); | |
930 | status = -1; | |
931 | do_close(conn, handle, handle_len); | |
932 | } else { | |
933 | status = do_close(conn, handle, handle_len); | |
934 | ||
935 | /* Override umask and utimes if asked */ | |
936 | #ifdef HAVE_FCHMOD | |
937 | if (pflag && fchmod(local_fd, mode) == -1) | |
938 | #else | |
939 | if (pflag && chmod(local_path, mode) == -1) | |
940 | #endif /* HAVE_FCHMOD */ | |
941 | error("Couldn't set mode on \"%s\": %s", local_path, | |
942 | strerror(errno)); | |
943 | if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) { | |
944 | struct timeval tv[2]; | |
945 | tv[0].tv_sec = a->atime; | |
946 | tv[1].tv_sec = a->mtime; | |
947 | tv[0].tv_usec = tv[1].tv_usec = 0; | |
948 | if (utimes(local_path, tv) == -1) | |
949 | error("Can't set times on \"%s\": %s", | |
950 | local_path, strerror(errno)); | |
951 | } | |
952 | } | |
953 | close(local_fd); | |
954 | buffer_free(&msg); | |
955 | xfree(handle); | |
956 | ||
957 | return(status); | |
958 | } | |
959 | ||
960 | int | |
961 | do_upload(struct sftp_conn *conn, char *local_path, char *remote_path, | |
962 | int pflag) | |
963 | { | |
964 | int local_fd, status; | |
965 | u_int handle_len, id, type; | |
966 | u_int64_t offset; | |
967 | char *handle, *data; | |
968 | Buffer msg; | |
969 | struct stat sb; | |
970 | Attrib a; | |
971 | u_int32_t startid; | |
972 | u_int32_t ackid; | |
973 | struct outstanding_ack { | |
974 | u_int id; | |
975 | u_int len; | |
976 | u_int64_t offset; | |
977 | TAILQ_ENTRY(outstanding_ack) tq; | |
978 | }; | |
979 | TAILQ_HEAD(ackhead, outstanding_ack) acks; | |
980 | struct outstanding_ack *ack; | |
981 | ||
982 | TAILQ_INIT(&acks); | |
983 | ||
984 | if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) { | |
985 | error("Couldn't open local file \"%s\" for reading: %s", | |
986 | local_path, strerror(errno)); | |
987 | return(-1); | |
988 | } | |
989 | if (fstat(local_fd, &sb) == -1) { | |
990 | error("Couldn't fstat local file \"%s\": %s", | |
991 | local_path, strerror(errno)); | |
992 | close(local_fd); | |
993 | return(-1); | |
994 | } | |
995 | stat_to_attrib(&sb, &a); | |
996 | ||
997 | a.flags &= ~SSH2_FILEXFER_ATTR_SIZE; | |
998 | a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID; | |
999 | a.perm &= 0777; | |
1000 | if (!pflag) | |
1001 | a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME; | |
1002 | ||
1003 | buffer_init(&msg); | |
1004 | ||
1005 | /* Send open request */ | |
1006 | id = conn->msg_id++; | |
1007 | buffer_put_char(&msg, SSH2_FXP_OPEN); | |
1008 | buffer_put_int(&msg, id); | |
1009 | buffer_put_cstring(&msg, remote_path); | |
1010 | buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC); | |
1011 | encode_attrib(&msg, &a); | |
1012 | send_msg(conn->fd_out, &msg); | |
1013 | debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path); | |
1014 | ||
1015 | buffer_clear(&msg); | |
1016 | ||
1017 | handle = get_handle(conn->fd_in, id, &handle_len); | |
1018 | if (handle == NULL) { | |
1019 | close(local_fd); | |
1020 | buffer_free(&msg); | |
1021 | return(-1); | |
1022 | } | |
1023 | ||
1024 | startid = ackid = id + 1; | |
1025 | data = xmalloc(conn->transfer_buflen); | |
1026 | ||
1027 | /* Read from local and write to remote */ | |
1028 | offset = 0; | |
1029 | for (;;) { | |
1030 | int len; | |
1031 | ||
1032 | /* | |
1033 | * Can't use atomicio here because it returns 0 on EOF, thus losing | |
1034 | * the last block of the file | |
1035 | */ | |
1036 | do | |
1037 | len = read(local_fd, data, conn->transfer_buflen); | |
1038 | while ((len == -1) && (errno == EINTR || errno == EAGAIN)); | |
1039 | ||
1040 | if (len == -1) | |
1041 | fatal("Couldn't read from \"%s\": %s", local_path, | |
1042 | strerror(errno)); | |
1043 | ||
1044 | if (len != 0) { | |
1045 | ack = xmalloc(sizeof(*ack)); | |
1046 | ack->id = ++id; | |
1047 | ack->offset = offset; | |
1048 | ack->len = len; | |
1049 | TAILQ_INSERT_TAIL(&acks, ack, tq); | |
1050 | ||
1051 | buffer_clear(&msg); | |
1052 | buffer_put_char(&msg, SSH2_FXP_WRITE); | |
1053 | buffer_put_int(&msg, ack->id); | |
1054 | buffer_put_string(&msg, handle, handle_len); | |
1055 | buffer_put_int64(&msg, offset); | |
1056 | buffer_put_string(&msg, data, len); | |
1057 | send_msg(conn->fd_out, &msg); | |
1058 | debug3("Sent message SSH2_FXP_WRITE I:%d O:%llu S:%u", | |
1059 | id, (unsigned long long)offset, len); | |
1060 | } else if (TAILQ_FIRST(&acks) == NULL) | |
1061 | break; | |
1062 | ||
1063 | if (ack == NULL) | |
1064 | fatal("Unexpected ACK %u", id); | |
1065 | ||
1066 | if (id == startid || len == 0 || | |
1067 | id - ackid >= conn->num_requests) { | |
1068 | buffer_clear(&msg); | |
1069 | get_msg(conn->fd_in, &msg); | |
1070 | type = buffer_get_char(&msg); | |
1071 | id = buffer_get_int(&msg); | |
1072 | ||
1073 | if (type != SSH2_FXP_STATUS) | |
1074 | fatal("Expected SSH2_FXP_STATUS(%d) packet, " | |
1075 | "got %d", SSH2_FXP_STATUS, type); | |
1076 | ||
1077 | status = buffer_get_int(&msg); | |
1078 | debug3("SSH2_FXP_STATUS %d", status); | |
1079 | ||
1080 | /* Find the request in our queue */ | |
1081 | for(ack = TAILQ_FIRST(&acks); | |
1082 | ack != NULL && ack->id != id; | |
1083 | ack = TAILQ_NEXT(ack, tq)) | |
1084 | ; | |
1085 | if (ack == NULL) | |
1086 | fatal("Can't find request for ID %d", id); | |
1087 | TAILQ_REMOVE(&acks, ack, tq); | |
1088 | ||
1089 | if (status != SSH2_FX_OK) { | |
1090 | error("Couldn't write to remote file \"%s\": %s", | |
1091 | remote_path, fx2txt(status)); | |
1092 | do_close(conn, handle, handle_len); | |
1093 | close(local_fd); | |
1094 | goto done; | |
1095 | } | |
1096 | debug3("In write loop, ack for %u %d bytes at %llu", | |
1097 | ack->id, ack->len, (unsigned long long)ack->offset); | |
1098 | ++ackid; | |
1099 | free(ack); | |
1100 | } | |
1101 | offset += len; | |
1102 | } | |
1103 | xfree(data); | |
1104 | ||
1105 | if (close(local_fd) == -1) { | |
1106 | error("Couldn't close local file \"%s\": %s", local_path, | |
1107 | strerror(errno)); | |
1108 | do_close(conn, handle, handle_len); | |
1109 | status = -1; | |
1110 | goto done; | |
1111 | } | |
1112 | ||
1113 | /* Override umask and utimes if asked */ | |
1114 | if (pflag) | |
1115 | do_fsetstat(conn, handle, handle_len, &a); | |
1116 | ||
1117 | status = do_close(conn, handle, handle_len); | |
1118 | ||
1119 | done: | |
1120 | xfree(handle); | |
1121 | buffer_free(&msg); | |
1122 | return(status); | |
1123 | } |