Commit | Line | Data |
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a6b151f1 | 1 | /* Host file transfer support for gdbserver. |
9b254dd1 | 2 | Copyright (C) 2007, 2008 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 | |
10 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | along with this program; if not, write to the Free Software | |
20 | Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
21 | Boston, MA 02110-1301, USA. */ | |
22 | ||
23 | #include "server.h" | |
24 | #include "gdb/fileio.h" | |
25 | ||
a6b151f1 DJ |
26 | #include <fcntl.h> |
27 | #include <limits.h> | |
28 | #include <unistd.h> | |
29 | ||
30 | extern int remote_debug; | |
31 | ||
32 | struct fd_list | |
33 | { | |
34 | int fd; | |
35 | struct fd_list *next; | |
36 | }; | |
37 | ||
38 | static struct fd_list *open_fds; | |
39 | ||
40 | static int | |
41 | safe_fromhex (char a, int *nibble) | |
42 | { | |
43 | if (a >= '0' && a <= '9') | |
44 | *nibble = a - '0'; | |
45 | else if (a >= 'a' && a <= 'f') | |
46 | *nibble = a - 'a' + 10; | |
47 | else if (a >= 'A' && a <= 'F') | |
48 | *nibble = a - 'A' + 10; | |
49 | else | |
50 | return -1; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int | |
56 | require_filename (char **pp, char *filename) | |
57 | { | |
58 | int count; | |
59 | char *p; | |
60 | ||
61 | p = *pp; | |
62 | count = 0; | |
63 | ||
64 | while (*p && *p != ',') | |
65 | { | |
66 | int nib1, nib2; | |
67 | ||
68 | /* Don't allow overflow. */ | |
69 | if (count >= PATH_MAX - 1) | |
70 | return -1; | |
71 | ||
72 | if (safe_fromhex (p[0], &nib1) | |
73 | || safe_fromhex (p[1], &nib2)) | |
74 | return -1; | |
75 | ||
76 | filename[count++] = nib1 * 16 + nib2; | |
77 | p += 2; | |
78 | } | |
79 | ||
80 | filename[count] = '\0'; | |
81 | *pp = p; | |
82 | return 0; | |
83 | } | |
84 | ||
85 | static int | |
86 | require_int (char **pp, int *value) | |
87 | { | |
88 | char *p; | |
89 | int count; | |
90 | ||
91 | p = *pp; | |
92 | *value = 0; | |
93 | count = 0; | |
94 | ||
95 | while (*p && *p != ',') | |
96 | { | |
97 | int nib; | |
98 | ||
99 | /* Don't allow overflow. */ | |
100 | if (count >= 7) | |
101 | return -1; | |
102 | ||
103 | if (safe_fromhex (p[0], &nib)) | |
104 | return -1; | |
105 | *value = *value * 16 + nib; | |
106 | p++; | |
107 | count++; | |
108 | } | |
109 | ||
110 | *pp = p; | |
111 | return 0; | |
112 | } | |
113 | ||
114 | static int | |
115 | require_data (char *p, int p_len, char **data, int *data_len) | |
116 | { | |
117 | int input_index, output_index, escaped; | |
118 | ||
119 | *data = malloc (p_len); | |
120 | ||
121 | output_index = 0; | |
122 | escaped = 0; | |
123 | for (input_index = 0; input_index < p_len; input_index++) | |
124 | { | |
125 | char b = p[input_index]; | |
126 | ||
127 | if (escaped) | |
128 | { | |
129 | (*data)[output_index++] = b ^ 0x20; | |
130 | escaped = 0; | |
131 | } | |
132 | else if (b == '}') | |
133 | escaped = 1; | |
134 | else | |
135 | (*data)[output_index++] = b; | |
136 | } | |
137 | ||
138 | if (escaped) | |
139 | return -1; | |
140 | ||
141 | *data_len = output_index; | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int | |
146 | require_comma (char **pp) | |
147 | { | |
148 | if (**pp == ',') | |
149 | { | |
150 | (*pp)++; | |
151 | return 0; | |
152 | } | |
153 | else | |
154 | return -1; | |
155 | } | |
156 | ||
157 | static int | |
158 | require_end (char *p) | |
159 | { | |
160 | if (*p == '\0') | |
161 | return 0; | |
162 | else | |
163 | return -1; | |
164 | } | |
165 | ||
166 | static int | |
167 | require_valid_fd (int fd) | |
168 | { | |
169 | struct fd_list *fd_ptr; | |
170 | ||
171 | for (fd_ptr = open_fds; fd_ptr != NULL; fd_ptr = fd_ptr->next) | |
172 | if (fd_ptr->fd == fd) | |
173 | return 0; | |
174 | ||
175 | return -1; | |
176 | } | |
177 | ||
59a016f0 PA |
178 | /* Fill in own_buf with the last hostio error packet, however it |
179 | suitable for the target. */ | |
a6b151f1 | 180 | static void |
59a016f0 | 181 | hostio_error (char *own_buf) |
a6b151f1 | 182 | { |
59a016f0 | 183 | the_target->hostio_last_error (own_buf); |
a6b151f1 DJ |
184 | } |
185 | ||
186 | static void | |
187 | hostio_packet_error (char *own_buf) | |
188 | { | |
59a016f0 | 189 | sprintf (own_buf, "F-1,%x", FILEIO_EINVAL); |
a6b151f1 DJ |
190 | } |
191 | ||
192 | static void | |
193 | hostio_reply (char *own_buf, int result) | |
194 | { | |
195 | sprintf (own_buf, "F%x", result); | |
196 | } | |
197 | ||
198 | static int | |
199 | hostio_reply_with_data (char *own_buf, char *buffer, int len, | |
200 | int *new_packet_len) | |
201 | { | |
202 | int input_index, output_index, out_maxlen; | |
203 | ||
204 | sprintf (own_buf, "F%x;", len); | |
205 | output_index = strlen (own_buf); | |
206 | ||
207 | out_maxlen = PBUFSIZ; | |
208 | ||
209 | for (input_index = 0; input_index < len; input_index++) | |
210 | { | |
211 | char b = buffer[input_index]; | |
212 | ||
213 | if (b == '$' || b == '#' || b == '}' || b == '*') | |
214 | { | |
215 | /* These must be escaped. */ | |
216 | if (output_index + 2 > out_maxlen) | |
217 | break; | |
218 | own_buf[output_index++] = '}'; | |
219 | own_buf[output_index++] = b ^ 0x20; | |
220 | } | |
221 | else | |
222 | { | |
223 | if (output_index + 1 > out_maxlen) | |
224 | break; | |
225 | own_buf[output_index++] = b; | |
226 | } | |
227 | } | |
228 | ||
229 | *new_packet_len = output_index; | |
230 | return input_index; | |
231 | } | |
232 | ||
233 | static int | |
234 | fileio_open_flags_to_host (int fileio_open_flags, int *open_flags_p) | |
235 | { | |
236 | int open_flags = 0; | |
237 | ||
238 | if (fileio_open_flags & ~FILEIO_O_SUPPORTED) | |
239 | return -1; | |
240 | ||
241 | if (fileio_open_flags & FILEIO_O_CREAT) | |
242 | open_flags |= O_CREAT; | |
243 | if (fileio_open_flags & FILEIO_O_EXCL) | |
244 | open_flags |= O_EXCL; | |
245 | if (fileio_open_flags & FILEIO_O_TRUNC) | |
246 | open_flags |= O_TRUNC; | |
247 | if (fileio_open_flags & FILEIO_O_APPEND) | |
248 | open_flags |= O_APPEND; | |
249 | if (fileio_open_flags & FILEIO_O_RDONLY) | |
250 | open_flags |= O_RDONLY; | |
251 | if (fileio_open_flags & FILEIO_O_WRONLY) | |
252 | open_flags |= O_WRONLY; | |
253 | if (fileio_open_flags & FILEIO_O_RDWR) | |
254 | open_flags |= O_RDWR; | |
255 | /* On systems supporting binary and text mode, always open files in | |
256 | binary mode. */ | |
257 | #ifdef O_BINARY | |
258 | open_flags |= O_BINARY; | |
259 | #endif | |
260 | ||
261 | *open_flags_p = open_flags; | |
262 | return 0; | |
263 | } | |
264 | ||
265 | static void | |
266 | handle_open (char *own_buf) | |
267 | { | |
268 | char filename[PATH_MAX]; | |
269 | char *p; | |
270 | int fileio_flags, mode, flags, fd; | |
271 | struct fd_list *new_fd; | |
272 | ||
273 | p = own_buf + strlen ("vFile:open:"); | |
274 | ||
275 | if (require_filename (&p, filename) | |
276 | || require_comma (&p) | |
277 | || require_int (&p, &fileio_flags) | |
278 | || require_comma (&p) | |
279 | || require_int (&p, &mode) | |
280 | || require_end (p) | |
281 | || fileio_open_flags_to_host (fileio_flags, &flags)) | |
282 | { | |
283 | hostio_packet_error (own_buf); | |
284 | return; | |
285 | } | |
286 | ||
287 | /* We do not need to convert MODE, since the fileio protocol | |
288 | uses the standard values. */ | |
289 | fd = open (filename, flags, mode); | |
290 | ||
291 | if (fd == -1) | |
292 | { | |
59a016f0 | 293 | hostio_error (own_buf); |
a6b151f1 DJ |
294 | return; |
295 | } | |
296 | ||
297 | /* Record the new file descriptor. */ | |
298 | new_fd = malloc (sizeof (struct fd_list)); | |
299 | new_fd->fd = fd; | |
300 | new_fd->next = open_fds; | |
301 | open_fds = new_fd; | |
302 | ||
303 | hostio_reply (own_buf, fd); | |
304 | } | |
305 | ||
306 | static void | |
307 | handle_pread (char *own_buf, int *new_packet_len) | |
308 | { | |
309 | int fd, ret, len, offset, bytes_sent; | |
310 | char *p, *data; | |
311 | ||
312 | p = own_buf + strlen ("vFile:pread:"); | |
313 | ||
314 | if (require_int (&p, &fd) | |
315 | || require_comma (&p) | |
316 | || require_valid_fd (fd) | |
317 | || require_int (&p, &len) | |
318 | || require_comma (&p) | |
319 | || require_int (&p, &offset) | |
320 | || require_end (p)) | |
321 | { | |
322 | hostio_packet_error (own_buf); | |
323 | return; | |
324 | } | |
325 | ||
326 | data = malloc (len); | |
4e799345 | 327 | #ifdef HAVE_PREAD |
a6b151f1 | 328 | ret = pread (fd, data, len, offset); |
4e799345 DJ |
329 | #else |
330 | ret = lseek (fd, offset, SEEK_SET); | |
331 | if (ret != -1) | |
332 | ret = read (fd, data, len); | |
333 | #endif | |
a6b151f1 DJ |
334 | |
335 | if (ret == -1) | |
336 | { | |
59a016f0 | 337 | hostio_error (own_buf); |
a6b151f1 DJ |
338 | free (data); |
339 | return; | |
340 | } | |
341 | ||
342 | bytes_sent = hostio_reply_with_data (own_buf, data, ret, new_packet_len); | |
343 | ||
344 | /* If we were using read, and the data did not all fit in the reply, | |
345 | we would have to back up using lseek here. With pread it does | |
346 | not matter. But we still have a problem; the return value in the | |
347 | packet might be wrong, so we must fix it. This time it will | |
348 | definitely fit. */ | |
349 | if (bytes_sent < ret) | |
350 | bytes_sent = hostio_reply_with_data (own_buf, data, bytes_sent, | |
351 | new_packet_len); | |
352 | ||
353 | free (data); | |
354 | } | |
355 | ||
356 | static void | |
357 | handle_pwrite (char *own_buf, int packet_len) | |
358 | { | |
359 | int fd, ret, len, offset; | |
360 | char *p, *data; | |
361 | ||
362 | p = own_buf + strlen ("vFile:pwrite:"); | |
363 | ||
364 | if (require_int (&p, &fd) | |
365 | || require_comma (&p) | |
366 | || require_valid_fd (fd) | |
367 | || require_int (&p, &offset) | |
368 | || require_comma (&p) | |
369 | || require_data (p, packet_len - (p - own_buf), &data, &len)) | |
370 | { | |
371 | hostio_packet_error (own_buf); | |
372 | return; | |
373 | } | |
374 | ||
4e799345 | 375 | #ifdef HAVE_PWRITE |
a6b151f1 | 376 | ret = pwrite (fd, data, len, offset); |
4e799345 DJ |
377 | #else |
378 | ret = lseek (fd, offset, SEEK_SET); | |
379 | if (ret != -1) | |
380 | ret = write (fd, data, len); | |
381 | #endif | |
a6b151f1 DJ |
382 | |
383 | if (ret == -1) | |
384 | { | |
59a016f0 | 385 | hostio_error (own_buf); |
a6b151f1 DJ |
386 | free (data); |
387 | return; | |
388 | } | |
389 | ||
390 | hostio_reply (own_buf, ret); | |
391 | free (data); | |
392 | } | |
393 | ||
394 | static void | |
395 | handle_close (char *own_buf) | |
396 | { | |
397 | int fd, ret; | |
398 | char *p; | |
399 | struct fd_list **open_fd_p, *old_fd; | |
400 | ||
401 | p = own_buf + strlen ("vFile:close:"); | |
402 | ||
403 | if (require_int (&p, &fd) | |
404 | || require_valid_fd (fd) | |
405 | || require_end (p)) | |
406 | { | |
407 | hostio_packet_error (own_buf); | |
408 | return; | |
409 | } | |
410 | ||
411 | ret = close (fd); | |
412 | ||
413 | if (ret == -1) | |
414 | { | |
59a016f0 | 415 | hostio_error (own_buf); |
a6b151f1 DJ |
416 | return; |
417 | } | |
418 | ||
419 | open_fd_p = &open_fds; | |
420 | while (*open_fd_p && (*open_fd_p)->fd != fd) | |
421 | open_fd_p = &(*open_fd_p)->next; | |
422 | ||
423 | old_fd = *open_fd_p; | |
424 | *open_fd_p = (*open_fd_p)->next; | |
425 | free (old_fd); | |
426 | ||
427 | hostio_reply (own_buf, ret); | |
428 | } | |
429 | ||
430 | static void | |
431 | handle_unlink (char *own_buf) | |
432 | { | |
433 | char filename[PATH_MAX]; | |
434 | char *p; | |
435 | int ret; | |
436 | ||
437 | p = own_buf + strlen ("vFile:unlink:"); | |
438 | ||
439 | if (require_filename (&p, filename) | |
440 | || require_end (p)) | |
441 | { | |
442 | hostio_packet_error (own_buf); | |
443 | return; | |
444 | } | |
445 | ||
446 | ret = unlink (filename); | |
447 | ||
448 | if (ret == -1) | |
449 | { | |
59a016f0 | 450 | hostio_error (own_buf); |
a6b151f1 DJ |
451 | return; |
452 | } | |
453 | ||
454 | hostio_reply (own_buf, ret); | |
455 | } | |
456 | ||
457 | /* Handle all the 'F' file transfer packets. */ | |
458 | ||
459 | int | |
460 | handle_vFile (char *own_buf, int packet_len, int *new_packet_len) | |
461 | { | |
462 | if (strncmp (own_buf, "vFile:open:", 11) == 0) | |
463 | handle_open (own_buf); | |
464 | else if (strncmp (own_buf, "vFile:pread:", 11) == 0) | |
465 | handle_pread (own_buf, new_packet_len); | |
466 | else if (strncmp (own_buf, "vFile:pwrite:", 12) == 0) | |
467 | handle_pwrite (own_buf, packet_len); | |
468 | else if (strncmp (own_buf, "vFile:close:", 12) == 0) | |
469 | handle_close (own_buf); | |
470 | else if (strncmp (own_buf, "vFile:unlink:", 13) == 0) | |
471 | handle_unlink (own_buf); | |
472 | else | |
473 | return 0; | |
474 | ||
475 | return 1; | |
476 | } |