4c7f0d61 |
1 | /* |
2 | * sftp.c: SFTP generic client code. |
3 | */ |
4 | |
5 | #include <stdio.h> |
6 | #include <stdlib.h> |
4a8fc3c4 |
7 | #include <string.h> |
4c7f0d61 |
8 | #include <assert.h> |
4c7f0d61 |
9 | |
10 | #include "int64.h" |
11 | #include "sftp.h" |
12 | |
13 | #define smalloc malloc |
14 | #define srealloc realloc |
15 | #define sfree free |
16 | |
17 | #define GET_32BIT(cp) \ |
18 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
19 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
20 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
21 | ((unsigned long)(unsigned char)(cp)[3])) |
22 | |
23 | #define PUT_32BIT(cp, value) { \ |
24 | (cp)[0] = (unsigned char)((value) >> 24); \ |
25 | (cp)[1] = (unsigned char)((value) >> 16); \ |
26 | (cp)[2] = (unsigned char)((value) >> 8); \ |
27 | (cp)[3] = (unsigned char)(value); } |
28 | |
29 | struct sftp_packet { |
30 | char *data; |
31 | int length, maxlen; |
32 | int savedpos; |
33 | int type; |
34 | }; |
35 | |
36 | /* ---------------------------------------------------------------------- |
37 | * SFTP packet construction functions. |
38 | */ |
32874aea |
39 | static void sftp_pkt_ensure(struct sftp_packet *pkt, int length) |
40 | { |
4c7f0d61 |
41 | if (pkt->maxlen < length) { |
32874aea |
42 | pkt->maxlen = length + 256; |
4c7f0d61 |
43 | pkt->data = srealloc(pkt->data, pkt->maxlen); |
44 | } |
45 | } |
32874aea |
46 | static void sftp_pkt_adddata(struct sftp_packet *pkt, void *data, int len) |
47 | { |
4c7f0d61 |
48 | pkt->length += len; |
49 | sftp_pkt_ensure(pkt, pkt->length); |
32874aea |
50 | memcpy(pkt->data + pkt->length - len, data, len); |
4c7f0d61 |
51 | } |
32874aea |
52 | static void sftp_pkt_addbyte(struct sftp_packet *pkt, unsigned char byte) |
53 | { |
4c7f0d61 |
54 | sftp_pkt_adddata(pkt, &byte, 1); |
55 | } |
32874aea |
56 | static struct sftp_packet *sftp_pkt_init(int pkt_type) |
57 | { |
4c7f0d61 |
58 | struct sftp_packet *pkt; |
59 | pkt = smalloc(sizeof(struct sftp_packet)); |
60 | pkt->data = NULL; |
61 | pkt->savedpos = -1; |
62 | pkt->length = 0; |
63 | pkt->maxlen = 0; |
32874aea |
64 | sftp_pkt_addbyte(pkt, (unsigned char) pkt_type); |
4c7f0d61 |
65 | return pkt; |
66 | } |
32874aea |
67 | static void sftp_pkt_addbool(struct sftp_packet *pkt, unsigned char value) |
68 | { |
4c7f0d61 |
69 | sftp_pkt_adddata(pkt, &value, 1); |
70 | } |
32874aea |
71 | static void sftp_pkt_adduint32(struct sftp_packet *pkt, |
72 | unsigned long value) |
73 | { |
4c7f0d61 |
74 | unsigned char x[4]; |
75 | PUT_32BIT(x, value); |
76 | sftp_pkt_adddata(pkt, x, 4); |
77 | } |
32874aea |
78 | static void sftp_pkt_adduint64(struct sftp_packet *pkt, uint64 value) |
79 | { |
4c7f0d61 |
80 | unsigned char x[8]; |
81 | PUT_32BIT(x, value.hi); |
32874aea |
82 | PUT_32BIT(x + 4, value.lo); |
4c7f0d61 |
83 | sftp_pkt_adddata(pkt, x, 8); |
84 | } |
32874aea |
85 | static void sftp_pkt_addstring_start(struct sftp_packet *pkt) |
86 | { |
4c7f0d61 |
87 | sftp_pkt_adduint32(pkt, 0); |
88 | pkt->savedpos = pkt->length; |
89 | } |
32874aea |
90 | static void sftp_pkt_addstring_str(struct sftp_packet *pkt, char *data) |
91 | { |
4c7f0d61 |
92 | sftp_pkt_adddata(pkt, data, strlen(data)); |
32874aea |
93 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
4c7f0d61 |
94 | } |
95 | static void sftp_pkt_addstring_data(struct sftp_packet *pkt, |
32874aea |
96 | char *data, int len) |
97 | { |
4c7f0d61 |
98 | sftp_pkt_adddata(pkt, data, len); |
32874aea |
99 | PUT_32BIT(pkt->data + pkt->savedpos - 4, pkt->length - pkt->savedpos); |
4c7f0d61 |
100 | } |
32874aea |
101 | static void sftp_pkt_addstring(struct sftp_packet *pkt, char *data) |
102 | { |
4c7f0d61 |
103 | sftp_pkt_addstring_start(pkt); |
104 | sftp_pkt_addstring_str(pkt, data); |
105 | } |
106 | |
107 | /* ---------------------------------------------------------------------- |
108 | * SFTP packet decode functions. |
109 | */ |
110 | |
32874aea |
111 | static unsigned char sftp_pkt_getbyte(struct sftp_packet *pkt) |
112 | { |
d8770b12 |
113 | unsigned char value; |
4c7f0d61 |
114 | if (pkt->length - pkt->savedpos < 1) |
32874aea |
115 | return 0; /* arrgh, no way to decline (FIXME?) */ |
4c7f0d61 |
116 | value = (unsigned char) pkt->data[pkt->savedpos]; |
117 | pkt->savedpos++; |
118 | return value; |
119 | } |
32874aea |
120 | static unsigned long sftp_pkt_getuint32(struct sftp_packet *pkt) |
121 | { |
4c7f0d61 |
122 | unsigned long value; |
123 | if (pkt->length - pkt->savedpos < 4) |
32874aea |
124 | return 0; /* arrgh, no way to decline (FIXME?) */ |
125 | value = GET_32BIT(pkt->data + pkt->savedpos); |
4c7f0d61 |
126 | pkt->savedpos += 4; |
127 | return value; |
128 | } |
129 | static void sftp_pkt_getstring(struct sftp_packet *pkt, |
32874aea |
130 | char **p, int *length) |
131 | { |
4c7f0d61 |
132 | *p = NULL; |
133 | if (pkt->length - pkt->savedpos < 4) |
32874aea |
134 | return; |
135 | *length = GET_32BIT(pkt->data + pkt->savedpos); |
4c7f0d61 |
136 | pkt->savedpos += 4; |
137 | if (pkt->length - pkt->savedpos < *length) |
32874aea |
138 | return; |
139 | *p = pkt->data + pkt->savedpos; |
4c7f0d61 |
140 | pkt->savedpos += *length; |
141 | } |
32874aea |
142 | static struct fxp_attrs sftp_pkt_getattrs(struct sftp_packet *pkt) |
143 | { |
4c7f0d61 |
144 | struct fxp_attrs ret; |
145 | ret.flags = sftp_pkt_getuint32(pkt); |
146 | if (ret.flags & SSH_FILEXFER_ATTR_SIZE) { |
147 | unsigned long hi, lo; |
148 | hi = sftp_pkt_getuint32(pkt); |
149 | lo = sftp_pkt_getuint32(pkt); |
150 | ret.size = uint64_make(hi, lo); |
151 | } |
152 | if (ret.flags & SSH_FILEXFER_ATTR_UIDGID) { |
153 | ret.uid = sftp_pkt_getuint32(pkt); |
154 | ret.gid = sftp_pkt_getuint32(pkt); |
155 | } |
156 | if (ret.flags & SSH_FILEXFER_ATTR_PERMISSIONS) { |
157 | ret.permissions = sftp_pkt_getuint32(pkt); |
158 | } |
159 | if (ret.flags & SSH_FILEXFER_ATTR_ACMODTIME) { |
160 | ret.atime = sftp_pkt_getuint32(pkt); |
161 | ret.mtime = sftp_pkt_getuint32(pkt); |
162 | } |
163 | if (ret.flags & SSH_FILEXFER_ATTR_EXTENDED) { |
164 | int count; |
165 | count = sftp_pkt_getuint32(pkt); |
166 | while (count--) { |
167 | char *str; |
168 | int len; |
169 | /* |
170 | * We should try to analyse these, if we ever find one |
171 | * we recognise. |
172 | */ |
173 | sftp_pkt_getstring(pkt, &str, &len); |
174 | sftp_pkt_getstring(pkt, &str, &len); |
175 | } |
176 | } |
177 | return ret; |
178 | } |
32874aea |
179 | static void sftp_pkt_free(struct sftp_packet *pkt) |
180 | { |
181 | if (pkt->data) |
182 | sfree(pkt->data); |
4c7f0d61 |
183 | sfree(pkt); |
184 | } |
185 | |
186 | /* ---------------------------------------------------------------------- |
4a8fc3c4 |
187 | * Send and receive packet functions. |
4c7f0d61 |
188 | */ |
32874aea |
189 | int sftp_send(struct sftp_packet *pkt) |
190 | { |
4a8fc3c4 |
191 | int ret; |
4c7f0d61 |
192 | char x[4]; |
193 | PUT_32BIT(x, pkt->length); |
32874aea |
194 | ret = (sftp_senddata(x, 4) && sftp_senddata(pkt->data, pkt->length)); |
4c7f0d61 |
195 | sftp_pkt_free(pkt); |
4a8fc3c4 |
196 | return ret; |
4c7f0d61 |
197 | } |
32874aea |
198 | struct sftp_packet *sftp_recv(void) |
199 | { |
4c7f0d61 |
200 | struct sftp_packet *pkt; |
201 | char x[4]; |
4c7f0d61 |
202 | |
4a8fc3c4 |
203 | if (!sftp_recvdata(x, 4)) |
204 | return NULL; |
4c7f0d61 |
205 | |
206 | pkt = smalloc(sizeof(struct sftp_packet)); |
207 | pkt->savedpos = 0; |
208 | pkt->length = pkt->maxlen = GET_32BIT(x); |
209 | pkt->data = smalloc(pkt->length); |
210 | |
4a8fc3c4 |
211 | if (!sftp_recvdata(pkt->data, pkt->length)) { |
212 | sftp_pkt_free(pkt); |
213 | return NULL; |
4c7f0d61 |
214 | } |
215 | |
216 | pkt->type = sftp_pkt_getbyte(pkt); |
217 | |
218 | return pkt; |
219 | } |
220 | |
221 | /* ---------------------------------------------------------------------- |
222 | * String handling routines. |
223 | */ |
224 | |
32874aea |
225 | static char *mkstr(char *s, int len) |
226 | { |
227 | char *p = smalloc(len + 1); |
4c7f0d61 |
228 | memcpy(p, s, len); |
229 | p[len] = '\0'; |
230 | return p; |
231 | } |
232 | |
233 | /* ---------------------------------------------------------------------- |
234 | * SFTP primitives. |
235 | */ |
236 | |
237 | static const char *fxp_error_message; |
238 | static int fxp_errtype; |
239 | |
240 | /* |
241 | * Deal with (and free) an FXP_STATUS packet. Return 1 if |
242 | * SSH_FX_OK, 0 if SSH_FX_EOF, and -1 for anything else (error). |
243 | * Also place the status into fxp_errtype. |
244 | */ |
32874aea |
245 | static int fxp_got_status(struct sftp_packet *pktin) |
246 | { |
4c7f0d61 |
247 | static const char *const messages[] = { |
248 | /* SSH_FX_OK. The only time we will display a _message_ for this |
249 | * is if we were expecting something other than FXP_STATUS on |
250 | * success, so this is actually an error message! */ |
251 | "unexpected OK response", |
252 | "end of file", |
253 | "no such file or directory", |
254 | "permission denied", |
255 | "failure", |
256 | "bad message", |
257 | "no connection", |
258 | "connection lost", |
259 | "operation unsupported", |
260 | }; |
261 | |
262 | if (pktin->type != SSH_FXP_STATUS) { |
263 | fxp_error_message = "expected FXP_STATUS packet"; |
264 | fxp_errtype = -1; |
265 | } else { |
266 | fxp_errtype = sftp_pkt_getuint32(pktin); |
267 | if (fxp_errtype < 0 || |
32874aea |
268 | fxp_errtype >= sizeof(messages) / sizeof(*messages)) |
269 | fxp_error_message = "unknown error code"; |
4c7f0d61 |
270 | else |
271 | fxp_error_message = messages[fxp_errtype]; |
272 | } |
273 | |
274 | if (fxp_errtype == SSH_FX_OK) |
275 | return 1; |
276 | else if (fxp_errtype == SSH_FX_EOF) |
277 | return 0; |
278 | else |
279 | return -1; |
280 | } |
281 | |
32874aea |
282 | static void fxp_internal_error(char *msg) |
283 | { |
4c7f0d61 |
284 | fxp_error_message = msg; |
285 | fxp_errtype = -1; |
286 | } |
287 | |
32874aea |
288 | const char *fxp_error(void) |
289 | { |
4c7f0d61 |
290 | return fxp_error_message; |
291 | } |
292 | |
32874aea |
293 | int fxp_error_type(void) |
294 | { |
4c7f0d61 |
295 | return fxp_errtype; |
296 | } |
297 | |
298 | /* |
299 | * Perform exchange of init/version packets. Return 0 on failure. |
300 | */ |
32874aea |
301 | int fxp_init(void) |
302 | { |
4c7f0d61 |
303 | struct sftp_packet *pktout, *pktin; |
304 | int remotever; |
305 | |
306 | pktout = sftp_pkt_init(SSH_FXP_INIT); |
307 | sftp_pkt_adduint32(pktout, SFTP_PROTO_VERSION); |
308 | sftp_send(pktout); |
309 | |
310 | pktin = sftp_recv(); |
0d694692 |
311 | if (!pktin) { |
312 | fxp_internal_error("could not connect"); |
313 | return 0; |
314 | } |
4c7f0d61 |
315 | if (pktin->type != SSH_FXP_VERSION) { |
316 | fxp_internal_error("did not receive FXP_VERSION"); |
317 | return 0; |
318 | } |
319 | remotever = sftp_pkt_getuint32(pktin); |
320 | if (remotever > SFTP_PROTO_VERSION) { |
32874aea |
321 | fxp_internal_error |
322 | ("remote protocol is more advanced than we support"); |
4c7f0d61 |
323 | return 0; |
324 | } |
325 | /* |
326 | * In principle, this packet might also contain extension- |
327 | * string pairs. We should work through them and look for any |
328 | * we recognise. In practice we don't currently do so because |
329 | * we know we don't recognise _any_. |
330 | */ |
331 | sftp_pkt_free(pktin); |
332 | |
333 | return 1; |
334 | } |
335 | |
336 | /* |
f9e162aa |
337 | * Canonify a pathname. |
4c7f0d61 |
338 | */ |
32874aea |
339 | char *fxp_realpath(char *path) |
340 | { |
4c7f0d61 |
341 | struct sftp_packet *pktin, *pktout; |
342 | int id; |
343 | |
344 | pktout = sftp_pkt_init(SSH_FXP_REALPATH); |
345 | sftp_pkt_adduint32(pktout, 0x123); /* request id */ |
346 | sftp_pkt_addstring_start(pktout); |
347 | sftp_pkt_addstring_str(pktout, path); |
4c7f0d61 |
348 | sftp_send(pktout); |
349 | pktin = sftp_recv(); |
350 | id = sftp_pkt_getuint32(pktin); |
351 | if (id != 0x123) { |
352 | fxp_internal_error("request ID mismatch\n"); |
353 | return NULL; |
354 | } |
355 | if (pktin->type == SSH_FXP_NAME) { |
356 | int count; |
357 | char *path; |
358 | int len; |
359 | |
360 | count = sftp_pkt_getuint32(pktin); |
361 | if (count != 1) { |
362 | fxp_internal_error("REALPATH returned name count != 1\n"); |
363 | return NULL; |
364 | } |
365 | sftp_pkt_getstring(pktin, &path, &len); |
366 | if (!path) { |
367 | fxp_internal_error("REALPATH returned malformed FXP_NAME\n"); |
368 | return NULL; |
369 | } |
370 | path = mkstr(path, len); |
371 | sftp_pkt_free(pktin); |
372 | return path; |
373 | } else { |
374 | fxp_got_status(pktin); |
375 | return NULL; |
376 | } |
377 | } |
378 | |
379 | /* |
380 | * Open a file. |
381 | */ |
32874aea |
382 | struct fxp_handle *fxp_open(char *path, int type) |
383 | { |
4c7f0d61 |
384 | struct sftp_packet *pktin, *pktout; |
385 | int id; |
386 | |
387 | pktout = sftp_pkt_init(SSH_FXP_OPEN); |
388 | sftp_pkt_adduint32(pktout, 0x567); /* request id */ |
389 | sftp_pkt_addstring(pktout, path); |
390 | sftp_pkt_adduint32(pktout, type); |
391 | sftp_pkt_adduint32(pktout, 0); /* (FIXME) empty ATTRS structure */ |
392 | sftp_send(pktout); |
393 | pktin = sftp_recv(); |
394 | id = sftp_pkt_getuint32(pktin); |
395 | if (id != 0x567) { |
396 | fxp_internal_error("request ID mismatch\n"); |
397 | return NULL; |
398 | } |
399 | if (pktin->type == SSH_FXP_HANDLE) { |
4c7f0d61 |
400 | char *hstring; |
401 | struct fxp_handle *handle; |
402 | int len; |
403 | |
404 | sftp_pkt_getstring(pktin, &hstring, &len); |
405 | if (!hstring) { |
406 | fxp_internal_error("OPEN returned malformed FXP_HANDLE\n"); |
407 | return NULL; |
408 | } |
409 | handle = smalloc(sizeof(struct fxp_handle)); |
410 | handle->hstring = mkstr(hstring, len); |
f9e162aa |
411 | handle->hlen = len; |
4c7f0d61 |
412 | sftp_pkt_free(pktin); |
413 | return handle; |
414 | } else { |
415 | fxp_got_status(pktin); |
416 | return NULL; |
417 | } |
418 | } |
419 | |
420 | /* |
421 | * Open a directory. |
422 | */ |
32874aea |
423 | struct fxp_handle *fxp_opendir(char *path) |
424 | { |
4c7f0d61 |
425 | struct sftp_packet *pktin, *pktout; |
426 | int id; |
427 | |
428 | pktout = sftp_pkt_init(SSH_FXP_OPENDIR); |
429 | sftp_pkt_adduint32(pktout, 0x456); /* request id */ |
430 | sftp_pkt_addstring(pktout, path); |
431 | sftp_send(pktout); |
432 | pktin = sftp_recv(); |
433 | id = sftp_pkt_getuint32(pktin); |
434 | if (id != 0x456) { |
435 | fxp_internal_error("request ID mismatch\n"); |
436 | return NULL; |
437 | } |
438 | if (pktin->type == SSH_FXP_HANDLE) { |
4c7f0d61 |
439 | char *hstring; |
440 | struct fxp_handle *handle; |
441 | int len; |
442 | |
443 | sftp_pkt_getstring(pktin, &hstring, &len); |
444 | if (!hstring) { |
445 | fxp_internal_error("OPENDIR returned malformed FXP_HANDLE\n"); |
446 | return NULL; |
447 | } |
448 | handle = smalloc(sizeof(struct fxp_handle)); |
449 | handle->hstring = mkstr(hstring, len); |
f9e162aa |
450 | handle->hlen = len; |
4c7f0d61 |
451 | sftp_pkt_free(pktin); |
452 | return handle; |
453 | } else { |
454 | fxp_got_status(pktin); |
455 | return NULL; |
456 | } |
457 | } |
458 | |
459 | /* |
460 | * Close a file/dir. |
461 | */ |
32874aea |
462 | void fxp_close(struct fxp_handle *handle) |
463 | { |
4c7f0d61 |
464 | struct sftp_packet *pktin, *pktout; |
465 | int id; |
466 | |
467 | pktout = sftp_pkt_init(SSH_FXP_CLOSE); |
468 | sftp_pkt_adduint32(pktout, 0x789); /* request id */ |
f9e162aa |
469 | sftp_pkt_addstring_start(pktout); |
470 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
4c7f0d61 |
471 | sftp_send(pktout); |
472 | pktin = sftp_recv(); |
473 | id = sftp_pkt_getuint32(pktin); |
474 | if (id != 0x789) { |
475 | fxp_internal_error("request ID mismatch\n"); |
476 | return; |
477 | } |
478 | fxp_got_status(pktin); |
479 | sfree(handle->hstring); |
480 | sfree(handle); |
481 | } |
482 | |
483 | /* |
484 | * Read from a file. Returns the number of bytes read, or -1 on an |
485 | * error, or possibly 0 if EOF. (I'm not entirely sure whether it |
486 | * will return 0 on EOF, or return -1 and store SSH_FX_EOF in the |
487 | * error indicator. It might even depend on the SFTP server.) |
488 | */ |
32874aea |
489 | int fxp_read(struct fxp_handle *handle, char *buffer, uint64 offset, |
490 | int len) |
491 | { |
4c7f0d61 |
492 | struct sftp_packet *pktin, *pktout; |
493 | int id; |
494 | |
495 | pktout = sftp_pkt_init(SSH_FXP_READ); |
496 | sftp_pkt_adduint32(pktout, 0xBCD); /* request id */ |
f9e162aa |
497 | sftp_pkt_addstring_start(pktout); |
498 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
4c7f0d61 |
499 | sftp_pkt_adduint64(pktout, offset); |
500 | sftp_pkt_adduint32(pktout, len); |
501 | sftp_send(pktout); |
502 | pktin = sftp_recv(); |
503 | id = sftp_pkt_getuint32(pktin); |
504 | if (id != 0xBCD) { |
505 | fxp_internal_error("request ID mismatch"); |
4a8fc3c4 |
506 | return -1; |
4c7f0d61 |
507 | } |
508 | if (pktin->type == SSH_FXP_DATA) { |
509 | char *str; |
510 | int rlen; |
511 | |
512 | sftp_pkt_getstring(pktin, &str, &rlen); |
513 | |
514 | if (rlen > len || rlen < 0) { |
515 | fxp_internal_error("READ returned more bytes than requested"); |
516 | return -1; |
517 | } |
518 | |
519 | memcpy(buffer, str, rlen); |
520 | sfree(pktin); |
521 | return rlen; |
522 | } else { |
523 | fxp_got_status(pktin); |
524 | return -1; |
525 | } |
526 | } |
527 | |
528 | /* |
529 | * Read from a directory. |
530 | */ |
32874aea |
531 | struct fxp_names *fxp_readdir(struct fxp_handle *handle) |
532 | { |
4c7f0d61 |
533 | struct sftp_packet *pktin, *pktout; |
534 | int id; |
535 | |
536 | pktout = sftp_pkt_init(SSH_FXP_READDIR); |
537 | sftp_pkt_adduint32(pktout, 0xABC); /* request id */ |
f9e162aa |
538 | sftp_pkt_addstring_start(pktout); |
539 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
4c7f0d61 |
540 | sftp_send(pktout); |
541 | pktin = sftp_recv(); |
542 | id = sftp_pkt_getuint32(pktin); |
543 | if (id != 0xABC) { |
544 | fxp_internal_error("request ID mismatch\n"); |
4a8fc3c4 |
545 | return NULL; |
4c7f0d61 |
546 | } |
547 | if (pktin->type == SSH_FXP_NAME) { |
548 | struct fxp_names *ret; |
549 | int i; |
550 | ret = smalloc(sizeof(struct fxp_names)); |
551 | ret->nnames = sftp_pkt_getuint32(pktin); |
552 | ret->names = smalloc(ret->nnames * sizeof(struct fxp_name)); |
553 | for (i = 0; i < ret->nnames; i++) { |
554 | char *str; |
555 | int len; |
556 | sftp_pkt_getstring(pktin, &str, &len); |
557 | ret->names[i].filename = mkstr(str, len); |
558 | sftp_pkt_getstring(pktin, &str, &len); |
559 | ret->names[i].longname = mkstr(str, len); |
560 | ret->names[i].attrs = sftp_pkt_getattrs(pktin); |
561 | } |
562 | return ret; |
563 | } else { |
564 | fxp_got_status(pktin); |
565 | return NULL; |
566 | } |
567 | } |
568 | |
569 | /* |
570 | * Write to a file. Returns 0 on error, 1 on OK. |
571 | */ |
32874aea |
572 | int fxp_write(struct fxp_handle *handle, char *buffer, uint64 offset, |
573 | int len) |
574 | { |
4c7f0d61 |
575 | struct sftp_packet *pktin, *pktout; |
576 | int id; |
577 | |
578 | pktout = sftp_pkt_init(SSH_FXP_WRITE); |
579 | sftp_pkt_adduint32(pktout, 0xDCB); /* request id */ |
f9e162aa |
580 | sftp_pkt_addstring_start(pktout); |
581 | sftp_pkt_addstring_data(pktout, handle->hstring, handle->hlen); |
4c7f0d61 |
582 | sftp_pkt_adduint64(pktout, offset); |
583 | sftp_pkt_addstring_start(pktout); |
584 | sftp_pkt_addstring_data(pktout, buffer, len); |
585 | sftp_send(pktout); |
586 | pktin = sftp_recv(); |
587 | id = sftp_pkt_getuint32(pktin); |
4a8fc3c4 |
588 | if (id != 0xDCB) { |
589 | fxp_internal_error("request ID mismatch\n"); |
d8770b12 |
590 | return 0; |
4a8fc3c4 |
591 | } |
4c7f0d61 |
592 | fxp_got_status(pktin); |
593 | return fxp_errtype == SSH_FX_OK; |
594 | } |
595 | |
596 | /* |
597 | * Free up an fxp_names structure. |
598 | */ |
32874aea |
599 | void fxp_free_names(struct fxp_names *names) |
600 | { |
4c7f0d61 |
601 | int i; |
602 | |
603 | for (i = 0; i < names->nnames; i++) { |
604 | sfree(names->names[i].filename); |
605 | sfree(names->names[i].longname); |
606 | } |
607 | sfree(names->names); |
608 | sfree(names); |
609 | } |