Commit | Line | Data |
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a6b151f1 | 1 | /* Host file transfer support for gdbserver. |
7b6bb8da | 2 | Copyright (C) 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. |
a6b151f1 DJ |
3 | |
4 | Contributed by CodeSourcery. | |
5 | ||
6 | This file is part of GDB. | |
7 | ||
8 | This program is free software; you can redistribute it and/or modify | |
9 | it under the terms of the GNU General Public License as published by | |
32de4b9d | 10 | the Free Software Foundation; either version 3 of the License, or |
a6b151f1 DJ |
11 | (at your option) any later version. |
12 | ||
13 | This program is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
32de4b9d | 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
a6b151f1 DJ |
20 | |
21 | #include "server.h" | |
22 | #include "gdb/fileio.h" | |
23 | ||
a6b151f1 DJ |
24 | #include <fcntl.h> |
25 | #include <limits.h> | |
26 | #include <unistd.h> | |
27 | ||
28 | extern int remote_debug; | |
29 | ||
30 | struct fd_list | |
31 | { | |
32 | int fd; | |
33 | struct fd_list *next; | |
34 | }; | |
35 | ||
36 | static struct fd_list *open_fds; | |
37 | ||
38 | static int | |
39 | safe_fromhex (char a, int *nibble) | |
40 | { | |
41 | if (a >= '0' && a <= '9') | |
42 | *nibble = a - '0'; | |
43 | else if (a >= 'a' && a <= 'f') | |
44 | *nibble = a - 'a' + 10; | |
45 | else if (a >= 'A' && a <= 'F') | |
46 | *nibble = a - 'A' + 10; | |
47 | else | |
48 | return -1; | |
49 | ||
50 | return 0; | |
51 | } | |
52 | ||
53 | static int | |
54 | require_filename (char **pp, char *filename) | |
55 | { | |
56 | int count; | |
57 | char *p; | |
58 | ||
59 | p = *pp; | |
60 | count = 0; | |
61 | ||
62 | while (*p && *p != ',') | |
63 | { | |
64 | int nib1, nib2; | |
65 | ||
66 | /* Don't allow overflow. */ | |
67 | if (count >= PATH_MAX - 1) | |
68 | return -1; | |
69 | ||
70 | if (safe_fromhex (p[0], &nib1) | |
71 | || safe_fromhex (p[1], &nib2)) | |
72 | return -1; | |
73 | ||
74 | filename[count++] = nib1 * 16 + nib2; | |
75 | p += 2; | |
76 | } | |
77 | ||
78 | filename[count] = '\0'; | |
79 | *pp = p; | |
80 | return 0; | |
81 | } | |
82 | ||
83 | static int | |
84 | require_int (char **pp, int *value) | |
85 | { | |
86 | char *p; | |
87 | int count; | |
88 | ||
89 | p = *pp; | |
90 | *value = 0; | |
91 | count = 0; | |
92 | ||
93 | while (*p && *p != ',') | |
94 | { | |
95 | int nib; | |
96 | ||
97 | /* Don't allow overflow. */ | |
98 | if (count >= 7) | |
99 | return -1; | |
100 | ||
101 | if (safe_fromhex (p[0], &nib)) | |
102 | return -1; | |
103 | *value = *value * 16 + nib; | |
104 | p++; | |
105 | count++; | |
106 | } | |
107 | ||
108 | *pp = p; | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static int | |
113 | require_data (char *p, int p_len, char **data, int *data_len) | |
114 | { | |
115 | int input_index, output_index, escaped; | |
116 | ||
bca929d3 | 117 | *data = xmalloc (p_len); |
a6b151f1 DJ |
118 | |
119 | output_index = 0; | |
120 | escaped = 0; | |
121 | for (input_index = 0; input_index < p_len; input_index++) | |
122 | { | |
123 | char b = p[input_index]; | |
124 | ||
125 | if (escaped) | |
126 | { | |
127 | (*data)[output_index++] = b ^ 0x20; | |
128 | escaped = 0; | |
129 | } | |
130 | else if (b == '}') | |
131 | escaped = 1; | |
132 | else | |
133 | (*data)[output_index++] = b; | |
134 | } | |
135 | ||
136 | if (escaped) | |
137 | return -1; | |
138 | ||
139 | *data_len = output_index; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | static int | |
144 | require_comma (char **pp) | |
145 | { | |
146 | if (**pp == ',') | |
147 | { | |
148 | (*pp)++; | |
149 | return 0; | |
150 | } | |
151 | else | |
152 | return -1; | |
153 | } | |
154 | ||
155 | static int | |
156 | require_end (char *p) | |
157 | { | |
158 | if (*p == '\0') | |
159 | return 0; | |
160 | else | |
161 | return -1; | |
162 | } | |
163 | ||
164 | static int | |
165 | require_valid_fd (int fd) | |
166 | { | |
167 | struct fd_list *fd_ptr; | |
168 | ||
169 | for (fd_ptr = open_fds; fd_ptr != NULL; fd_ptr = fd_ptr->next) | |
170 | if (fd_ptr->fd == fd) | |
171 | return 0; | |
172 | ||
173 | return -1; | |
174 | } | |
175 | ||
59a016f0 PA |
176 | /* Fill in own_buf with the last hostio error packet, however it |
177 | suitable for the target. */ | |
a6b151f1 | 178 | static void |
59a016f0 | 179 | hostio_error (char *own_buf) |
a6b151f1 | 180 | { |
59a016f0 | 181 | the_target->hostio_last_error (own_buf); |
a6b151f1 DJ |
182 | } |
183 | ||
184 | static void | |
185 | hostio_packet_error (char *own_buf) | |
186 | { | |
59a016f0 | 187 | sprintf (own_buf, "F-1,%x", FILEIO_EINVAL); |
a6b151f1 DJ |
188 | } |
189 | ||
190 | static void | |
191 | hostio_reply (char *own_buf, int result) | |
192 | { | |
193 | sprintf (own_buf, "F%x", result); | |
194 | } | |
195 | ||
196 | static int | |
197 | hostio_reply_with_data (char *own_buf, char *buffer, int len, | |
198 | int *new_packet_len) | |
199 | { | |
200 | int input_index, output_index, out_maxlen; | |
201 | ||
202 | sprintf (own_buf, "F%x;", len); | |
203 | output_index = strlen (own_buf); | |
204 | ||
205 | out_maxlen = PBUFSIZ; | |
206 | ||
207 | for (input_index = 0; input_index < len; input_index++) | |
208 | { | |
209 | char b = buffer[input_index]; | |
210 | ||
211 | if (b == '$' || b == '#' || b == '}' || b == '*') | |
212 | { | |
213 | /* These must be escaped. */ | |
214 | if (output_index + 2 > out_maxlen) | |
215 | break; | |
216 | own_buf[output_index++] = '}'; | |
217 | own_buf[output_index++] = b ^ 0x20; | |
218 | } | |
219 | else | |
220 | { | |
221 | if (output_index + 1 > out_maxlen) | |
222 | break; | |
223 | own_buf[output_index++] = b; | |
224 | } | |
225 | } | |
226 | ||
227 | *new_packet_len = output_index; | |
228 | return input_index; | |
229 | } | |
230 | ||
231 | static int | |
232 | fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p) | |
233 | { | |
234 | int open_flags = 0; | |
235 | ||
236 | if (fileio_open_flags & ~FILEIO_O_SUPPORTED) | |
237 | return -1; | |
238 | ||
239 | if (fileio_open_flags & FILEIO_O_CREAT) | |
240 | open_flags |= O_CREAT; | |
241 | if (fileio_open_flags & FILEIO_O_EXCL) | |
242 | open_flags |= O_EXCL; | |
243 | if (fileio_open_flags & FILEIO_O_TRUNC) | |
244 | open_flags |= O_TRUNC; | |
245 | if (fileio_open_flags & FILEIO_O_APPEND) | |
246 | open_flags |= O_APPEND; | |
247 | if (fileio_open_flags & FILEIO_O_RDONLY) | |
248 | open_flags |= O_RDONLY; | |
249 | if (fileio_open_flags & FILEIO_O_WRONLY) | |
250 | open_flags |= O_WRONLY; | |
251 | if (fileio_open_flags & FILEIO_O_RDWR) | |
252 | open_flags |= O_RDWR; | |
253 | /* On systems supporting binary and text mode, always open files in | |
254 | binary mode. */ | |
255 | #ifdef O_BINARY | |
256 | open_flags |= O_BINARY; | |
257 | #endif | |
258 | ||
259 | *open_flags_p = open_flags; | |
260 | return 0; | |
261 | } | |
262 | ||
263 | static void | |
264 | handle_open (char *own_buf) | |
265 | { | |
266 | char filename[PATH_MAX]; | |
267 | char *p; | |
268 | int fileio_flags, mode, flags, fd; | |
269 | struct fd_list *new_fd; | |
270 | ||
271 | p = own_buf + strlen ("vFile:open:"); | |
272 | ||
273 | if (require_filename (&p, filename) | |
274 | || require_comma (&p) | |
275 | || require_int (&p, &fileio_flags) | |
276 | || require_comma (&p) | |
277 | || require_int (&p, &mode) | |
278 | || require_end (p) | |
279 | || fileio_open_flags_to_host (fileio_flags, &flags)) | |
280 | { | |
281 | hostio_packet_error (own_buf); | |
282 | return; | |
283 | } | |
284 | ||
285 | /* We do not need to convert MODE, since the fileio protocol | |
286 | uses the standard values. */ | |
287 | fd = open (filename, flags, mode); | |
288 | ||
289 | if (fd == -1) | |
290 | { | |
59a016f0 | 291 | hostio_error (own_buf); |
a6b151f1 DJ |
292 | return; |
293 | } | |
294 | ||
295 | /* Record the new file descriptor. */ | |
bca929d3 | 296 | new_fd = xmalloc (sizeof (struct fd_list)); |
a6b151f1 DJ |
297 | new_fd->fd = fd; |
298 | new_fd->next = open_fds; | |
299 | open_fds = new_fd; | |
300 | ||
301 | hostio_reply (own_buf, fd); | |
302 | } | |
303 | ||
304 | static void | |
305 | handle_pread (char *own_buf, int *new_packet_len) | |
306 | { | |
307 | int fd, ret, len, offset, bytes_sent; | |
308 | char *p, *data; | |
309 | ||
310 | p = own_buf + strlen ("vFile:pread:"); | |
311 | ||
312 | if (require_int (&p, &fd) | |
313 | || require_comma (&p) | |
314 | || require_valid_fd (fd) | |
315 | || require_int (&p, &len) | |
316 | || require_comma (&p) | |
317 | || require_int (&p, &offset) | |
318 | || require_end (p)) | |
319 | { | |
320 | hostio_packet_error (own_buf); | |
321 | return; | |
322 | } | |
323 | ||
bca929d3 | 324 | data = xmalloc (len); |
4e799345 | 325 | #ifdef HAVE_PREAD |
a6b151f1 | 326 | ret = pread (fd, data, len, offset); |
4e799345 DJ |
327 | #else |
328 | ret = lseek (fd, offset, SEEK_SET); | |
329 | if (ret != -1) | |
330 | ret = read (fd, data, len); | |
331 | #endif | |
a6b151f1 DJ |
332 | |
333 | if (ret == -1) | |
334 | { | |
59a016f0 | 335 | hostio_error (own_buf); |
a6b151f1 DJ |
336 | free (data); |
337 | return; | |
338 | } | |
339 | ||
340 | bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len); | |
341 | ||
342 | /* If we were using read, and the data did not all fit in the reply, | |
343 | we would have to back up using lseek here. With pread it does | |
344 | not matter. But we still have a problem; the return value in the | |
345 | packet might be wrong, so we must fix it. This time it will | |
346 | definitely fit. */ | |
347 | if (bytes_sent < ret) | |
348 | bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent, | |
349 | new_packet_len); | |
350 | ||
351 | free (data); | |
352 | } | |
353 | ||
354 | static void | |
355 | handle_pwrite (char *own_buf, int packet_len) | |
356 | { | |
357 | int fd, ret, len, offset; | |
358 | char *p, *data; | |
359 | ||
360 | p = own_buf + strlen ("vFile:pwrite:"); | |
361 | ||
362 | if (require_int (&p, &fd) | |
363 | || require_comma (&p) | |
364 | || require_valid_fd (fd) | |
365 | || require_int (&p, &offset) | |
366 | || require_comma (&p) | |
367 | || require_data (p, packet_len - (p - own_buf), &data, &len)) | |
368 | { | |
369 | hostio_packet_error (own_buf); | |
370 | return; | |
371 | } | |
372 | ||
4e799345 | 373 | #ifdef HAVE_PWRITE |
a6b151f1 | 374 | ret = pwrite (fd, data, len, offset); |
4e799345 DJ |
375 | #else |
376 | ret = lseek (fd, offset, SEEK_SET); | |
377 | if (ret != -1) | |
378 | ret = write (fd, data, len); | |
379 | #endif | |
a6b151f1 DJ |
380 | |
381 | if (ret == -1) | |
382 | { | |
59a016f0 | 383 | hostio_error (own_buf); |
a6b151f1 DJ |
384 | free (data); |
385 | return; | |
386 | } | |
387 | ||
388 | hostio_reply (own_buf, ret); | |
389 | free (data); | |
390 | } | |
391 | ||
392 | static void | |
393 | handle_close (char *own_buf) | |
394 | { | |
395 | int fd, ret; | |
396 | char *p; | |
397 | struct fd_list **open_fd_p, *old_fd; | |
398 | ||
399 | p = own_buf + strlen ("vFile:close:"); | |
400 | ||
401 | if (require_int (&p, &fd) | |
402 | || require_valid_fd (fd) | |
403 | || require_end (p)) | |
404 | { | |
405 | hostio_packet_error (own_buf); | |
406 | return; | |
407 | } | |
408 | ||
409 | ret = close (fd); | |
410 | ||
411 | if (ret == -1) | |
412 | { | |
59a016f0 | 413 | hostio_error (own_buf); |
a6b151f1 DJ |
414 | return; |
415 | } | |
416 | ||
417 | open_fd_p = &open_fds; | |
418 | while (*open_fd_p && (*open_fd_p)->fd != fd) | |
419 | open_fd_p = &(*open_fd_p)->next; | |
420 | ||
421 | old_fd = *open_fd_p; | |
422 | *open_fd_p = (*open_fd_p)->next; | |
423 | free (old_fd); | |
424 | ||
425 | hostio_reply (own_buf, ret); | |
426 | } | |
427 | ||
428 | static void | |
429 | handle_unlink (char *own_buf) | |
430 | { | |
431 | char filename[PATH_MAX]; | |
432 | char *p; | |
433 | int ret; | |
434 | ||
435 | p = own_buf + strlen ("vFile:unlink:"); | |
436 | ||
437 | if (require_filename (&p, filename) | |
438 | || require_end (p)) | |
439 | { | |
440 | hostio_packet_error (own_buf); | |
441 | return; | |
442 | } | |
443 | ||
444 | ret = unlink (filename); | |
445 | ||
446 | if (ret == -1) | |
447 | { | |
59a016f0 | 448 | hostio_error (own_buf); |
a6b151f1 DJ |
449 | return; |
450 | } | |
451 | ||
452 | hostio_reply (own_buf, ret); | |
453 | } | |
454 | ||
455 | /* Handle all the 'F' file transfer packets. */ | |
456 | ||
457 | int | |
458 | handle_vFile (char *own_buf, int packet_len, int *new_packet_len) | |
459 | { | |
460 | if (strncmp (own_buf, "vFile:open:", 11) == 0) | |
461 | handle_open (own_buf); | |
462 | else if (strncmp (own_buf, "vFile:pread:", 11) == 0) | |
463 | handle_pread (own_buf, new_packet_len); | |
464 | else if (strncmp (own_buf, "vFile:pwrite:", 12) == 0) | |
465 | handle_pwrite (own_buf, packet_len); | |
466 | else if (strncmp (own_buf, "vFile:close:", 12) == 0) | |
467 | handle_close (own_buf); | |
468 | else if (strncmp (own_buf, "vFile:unlink:", 13) == 0) | |
469 | handle_unlink (own_buf); | |
470 | else | |
471 | return 0; | |
472 | ||
473 | return 1; | |
474 | } |