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-rw-r--r--busybox/modutils/modprobe.c654
1 files changed, 654 insertions, 0 deletions
diff --git a/busybox/modutils/modprobe.c b/busybox/modutils/modprobe.c
new file mode 100644
index 000000000..83244fca5
--- /dev/null
+++ b/busybox/modutils/modprobe.c
@@ -0,0 +1,654 @@
1/* vi: set sw=4 ts=4: */
2/*
3 * Modprobe written from scratch for BusyBox
4 *
5 * Copyright (c) 2002 by Robert Griebl, griebl@gmx.de
6 * Copyright (c) 2003 by Andrew Dennison, andrew.dennison@motec.com.au
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 GNU
16 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22*/
23
24#include <sys/utsname.h>
25#include <getopt.h>
26#include <stdlib.h>
27#include <unistd.h>
28#include <syslog.h>
29#include <string.h>
30#include <ctype.h>
31#include <fcntl.h>
32#include "busybox.h"
33
34
35
36struct dep_t {
37 char * m_name;
38 char * m_path;
39 char * m_options;
40
41 int m_isalias : 1;
42 int m_reserved : 15;
43
44 int m_depcnt : 16;
45 char ** m_deparr;
46
47 struct dep_t * m_next;
48};
49
50struct mod_list_t {
51 char * m_name;
52 char * m_path;
53 char * m_options;
54
55 struct mod_list_t * m_prev;
56 struct mod_list_t * m_next;
57};
58
59
60static struct dep_t *depend;
61static int autoclean, show_only, quiet, do_syslog, verbose;
62static int k_version;
63
64int parse_tag_value ( char *buffer, char **ptag, char **pvalue )
65{
66 char *tag, *value;
67
68 while ( isspace ( *buffer ))
69 buffer++;
70 tag = value = buffer;
71 while ( !isspace ( *value ))
72 if (!*value) return 0;
73 else value++;
74 *value++ = 0;
75 while ( isspace ( *value ))
76 value++;
77 if (!*value) return 0;
78
79 *ptag = tag;
80 *pvalue = value;
81
82 return 1;
83}
84
85/* Jump through hoops to simulate how fgets() grabs just one line at a
86 * time... Don't use any stdio since modprobe gets called from a kernel
87 * thread and stdio junk can overflow the limited stack...
88 */
89static char *reads ( int fd, char *buffer, size_t len )
90{
91 int n = read ( fd, buffer, len );
92
93 if ( n > 0 ) {
94 char *p;
95
96 buffer [len-1] = 0;
97 p = strchr ( buffer, '\n' );
98
99 if ( p ) {
100 off_t offset;
101
102 offset = lseek ( fd, 0L, SEEK_CUR ); // Get the current file descriptor offset
103 lseek ( fd, offset-n + (p-buffer) + 1, SEEK_SET ); // Set the file descriptor offset to right after the \n
104
105 p[1] = 0;
106 }
107 return buffer;
108 }
109
110 else
111 return 0;
112}
113
114static struct dep_t *build_dep ( void )
115{
116 int fd;
117 struct utsname un;
118 struct dep_t *first = 0;
119 struct dep_t *current = 0;
120 char buffer[2048];
121 char *filename = buffer;
122 int continuation_line = 0;
123
124 k_version = 0;
125 if ( uname ( &un ))
126 return 0;
127
128 // check for buffer overflow in following code
129 if ( bb_strlen ( un.release ) > ( sizeof( buffer ) - 64 )) {
130 return 0;
131 }
132 if (un.release[0] == '2') {
133 k_version = un.release[2] - '0';
134 }
135
136 strcpy ( filename, "/lib/modules/" );
137 strcat ( filename, un.release );
138 strcat ( filename, "/modules.dep" );
139
140 if (( fd = open ( filename, O_RDONLY )) < 0 ) {
141
142 /* Ok, that didn't work. Fall back to looking in /lib/modules */
143 if (( fd = open ( "/lib/modules/modules.dep", O_RDONLY )) < 0 ) {
144 return 0;
145 }
146 }
147
148 while ( reads ( fd, buffer, sizeof( buffer ))) {
149 int l = bb_strlen ( buffer );
150 char *p = 0;
151
152 while ( isspace ( buffer [l-1] )) {
153 buffer [l-1] = 0;
154 l--;
155 }
156
157 if ( l == 0 ) {
158 continuation_line = 0;
159 continue;
160 }
161
162 if ( !continuation_line ) {
163 char *col = strchr ( buffer, ':' );
164 char *dot = col;
165
166 if ( col ) {
167 char *mods;
168 char *modpath;
169 char *mod;
170
171 *col = 0;
172 mods = strrchr ( buffer, '/' );
173
174 if ( !mods )
175 mods = buffer;
176 else
177 mods++;
178
179 modpath = strchr ( buffer, '/' );
180 if ( !modpath )
181 modpath = buffer;
182#if defined(CONFIG_FEATURE_2_6_MODULES)
183 if ((k_version > 4) && ( *(col-3) == '.' ) &&
184 ( *(col-2) == 'k' ) && ( *(col-1) == 'o' ))
185 dot = col - 3;
186 else
187#endif
188 if (( *(col-2) == '.' ) && ( *(col-1) == 'o' ))
189 dot = col - 2;
190
191 mod = bb_xstrndup ( mods, dot - mods );
192
193 if ( !current ) {
194 first = current = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
195 }
196 else {
197 current-> m_next = (struct dep_t *) xmalloc ( sizeof ( struct dep_t ));
198 current = current-> m_next;
199 }
200 current-> m_name = mod;
201 current-> m_path = bb_xstrdup(modpath);
202 current-> m_options = 0;
203 current-> m_isalias = 0;
204 current-> m_depcnt = 0;
205 current-> m_deparr = 0;
206 current-> m_next = 0;
207
208 //printf ( "%s:\n", mod );
209 p = col + 1;
210 }
211 else
212 p = 0;
213 }
214 else
215 p = buffer;
216
217 while ( p && *p && isblank(*p))
218 p++;
219
220 if ( p && *p ) {
221 char *end = &buffer [l-1];
222 char *deps;
223 char *dep;
224 char *next;
225 int ext = 0;
226
227 while ( isblank ( *end ) || ( *end == '\\' ))
228 end--;
229
230 do
231 {
232 next = strchr (p, ' ' );
233 if (next)
234 {
235 *next = 0;
236 next--;
237 }
238 else
239 next = end;
240
241 deps = strrchr ( p, '/' );
242
243 if ( !deps || ( deps < p )) {
244 deps = p;
245
246 while ( isblank ( *deps ))
247 deps++;
248 }
249 else
250 deps++;
251
252#if defined(CONFIG_FEATURE_2_6_MODULES)
253 if ((k_version > 4) && ( *(next-2) == '.' ) && *(next-1) == 'k' &&
254 ( *next == 'o' ))
255 ext = 3;
256 else
257#endif
258 if (( *(next-1) == '.' ) && ( *next == 'o' ))
259 ext = 2;
260
261 /* Cope with blank lines */
262 if ((next-deps-ext+1) <= 0)
263 continue;
264 dep = bb_xstrndup ( deps, next - deps - ext + 1 );
265
266 current-> m_depcnt++;
267 current-> m_deparr = (char **) xrealloc ( current-> m_deparr,
268 sizeof ( char *) * current-> m_depcnt );
269 current-> m_deparr [current-> m_depcnt - 1] = dep;
270
271 //printf ( " %d) %s\n", current-> m_depcnt, current-> m_deparr [current-> m_depcnt -1] );
272 p = next + 2;
273 } while (next < end);
274 }
275
276 if ( buffer [l-1] == '\\' )
277 continuation_line = 1;
278 else
279 continuation_line = 0;
280 }
281 close ( fd );
282
283 // alias parsing is not 100% correct (no correct handling of continuation lines within an alias) !
284
285#if defined(CONFIG_FEATURE_2_6_MODULES)
286 if (( fd = open ( "/etc/modprobe.conf", O_RDONLY )) < 0 )
287#endif
288 if (( fd = open ( "/etc/modules.conf", O_RDONLY )) < 0 )
289 if (( fd = open ( "/etc/conf.modules", O_RDONLY )) < 0 )
290 return first;
291
292 continuation_line = 0;
293 while ( reads ( fd, buffer, sizeof( buffer ))) {
294 int l;
295 char *p;
296
297 p = strchr ( buffer, '#' );
298 if ( p )
299 *p = 0;
300
301 l = bb_strlen ( buffer );
302
303 while ( l && isspace ( buffer [l-1] )) {
304 buffer [l-1] = 0;
305 l--;
306 }
307
308 if ( l == 0 ) {
309 continuation_line = 0;
310 continue;
311 }
312
313 if ( !continuation_line ) {
314 if (( strncmp ( buffer, "alias", 5 ) == 0 ) && isspace ( buffer [5] )) {
315 char *alias, *mod;
316
317 if ( parse_tag_value ( buffer + 6, &alias, &mod )) {
318 // fprintf ( stderr, "ALIAS: '%s' -> '%s'\n", alias, mod );
319
320 if ( !current ) {
321 first = current = (struct dep_t *) xcalloc ( 1, sizeof ( struct dep_t ));
322 }
323 else {
324 current-> m_next = (struct dep_t *) xcalloc ( 1, sizeof ( struct dep_t ));
325 current = current-> m_next;
326 }
327 current-> m_name = bb_xstrdup ( alias );
328 current-> m_isalias = 1;
329
330 if (( strcmp ( mod, "off" ) == 0 ) || ( strcmp ( mod, "null" ) == 0 )) {
331 current-> m_depcnt = 0;
332 current-> m_deparr = 0;
333 }
334 else {
335 current-> m_depcnt = 1;
336 current-> m_deparr = xmalloc ( 1 * sizeof( char * ));
337 current-> m_deparr[0] = bb_xstrdup ( mod );
338 }
339 current-> m_next = 0;
340 }
341 }
342 else if (( strncmp ( buffer, "options", 7 ) == 0 ) && isspace ( buffer [7] )) {
343 char *mod, *opt;
344
345 if ( parse_tag_value ( buffer + 8, &mod, &opt )) {
346 struct dep_t *dt;
347
348 for ( dt = first; dt; dt = dt-> m_next ) {
349 if ( strcmp ( dt-> m_name, mod ) == 0 )
350 break;
351 }
352 if ( dt ) {
353 dt-> m_options = xrealloc ( dt-> m_options, bb_strlen( opt ) + 1 );
354 strcpy ( dt-> m_options, opt );
355
356 // fprintf ( stderr, "OPTION: '%s' -> '%s'\n", dt-> m_name, dt-> m_options );
357 }
358 }
359 }
360 }
361 }
362 close ( fd );
363
364 return first;
365}
366
367/* return 1 = loaded, 0 = not loaded, -1 = can't tell */
368static int already_loaded (const char *name)
369{
370 int fd;
371 char buffer[4096];
372
373 fd = open ("/proc/modules", O_RDONLY);
374 if (fd < 0)
375 return -1;
376
377 while ( reads ( fd, buffer, sizeof( buffer ))) {
378 char *p;
379
380 p = strchr (buffer, ' ');
381 if (p) {
382 *p = 0;
383 if (strcmp (name, buffer) == 0) {
384 close (fd);
385 return 1;
386 }
387 }
388 }
389
390 close (fd);
391 return 0;
392}
393
394static int mod_process ( struct mod_list_t *list, int do_insert )
395{
396 char lcmd [4096];
397 int rc = 0;
398
399 while ( list ) {
400 *lcmd = '\0';
401 if ( do_insert ) {
402 if (already_loaded (list->m_name) != 1)
403 snprintf ( lcmd, sizeof( lcmd ) - 1, "insmod %s %s %s %s %s",
404 do_syslog ? "-s" : "", autoclean ? "-k" : "",
405 quiet ? "-q" : "", list-> m_path, list-> m_options ?
406 list-> m_options : "" );
407 } else {
408 /* modutils uses short name for removal */
409 if (already_loaded (list->m_name) != 0)
410 snprintf ( lcmd, sizeof( lcmd ) - 1, "rmmod %s %s",
411 do_syslog ? "-s" : "", list-> m_name );
412 }
413
414 if (*lcmd) {
415 if (verbose) {
416 printf("%s\n", lcmd);
417 }
418 if (!show_only) {
419 int rc2 = system(lcmd);
420 if (do_insert) {
421 rc = rc2; /* only last module matters */
422 }
423 else if (!rc2) {
424 rc = 0; /* success if remove any mod */
425 }
426 }
427 }
428 list = do_insert ? list-> m_prev : list-> m_next;
429 }
430 return (show_only) ? 0 : rc;
431}
432
433static void check_dep ( char *mod, struct mod_list_t **head, struct mod_list_t **tail )
434{
435 struct mod_list_t *find;
436 struct dep_t *dt;
437 char *opt = 0;
438 char *path = 0;
439
440 // check dependencies
441 for ( dt = depend; dt; dt = dt-> m_next ) {
442 if ( strcmp ( dt-> m_name, mod ) == 0) {
443 mod = dt-> m_name;
444 path = dt-> m_path;
445 opt = dt-> m_options;
446 break;
447 }
448 }
449
450 // resolve alias names
451 while ( dt && dt-> m_isalias ) {
452 if ( dt-> m_depcnt == 1 ) {
453 struct dep_t *adt;
454
455 for ( adt = depend; adt; adt = adt-> m_next ) {
456 if ( strcmp ( adt-> m_name, dt-> m_deparr [0] ) == 0 )
457 break;
458 }
459 if ( adt ) {
460 dt = adt;
461 mod = dt-> m_name;
462 path = dt-> m_path;
463 if ( !opt )
464 opt = dt-> m_options;
465 }
466 else
467 return;
468 }
469 else
470 return;
471 }
472
473 if ( !path ) {
474 bb_error_msg ("module %s not found.", mod);
475 return;
476 }
477
478 // search for duplicates
479 for ( find = *head; find; find = find-> m_next ) {
480 if ( !strcmp ( mod, find-> m_name )) {
481 // found -> dequeue it
482
483 if ( find-> m_prev )
484 find-> m_prev-> m_next = find-> m_next;
485 else
486 *head = find-> m_next;
487
488 if ( find-> m_next )
489 find-> m_next-> m_prev = find-> m_prev;
490 else
491 *tail = find-> m_prev;
492
493 break; // there can be only one duplicate
494 }
495 }
496
497 if ( !find ) { // did not find a duplicate
498 find = (struct mod_list_t *) xmalloc ( sizeof(struct mod_list_t));
499 find-> m_name = mod;
500 find-> m_path = path;
501 find-> m_options = opt;
502 }
503
504 // enqueue at tail
505 if ( *tail )
506 (*tail)-> m_next = find;
507 find-> m_prev = *tail;
508 find-> m_next = 0;
509
510 if ( !*head )
511 *head = find;
512 *tail = find;
513
514 if ( dt ) {
515 int i;
516
517 for ( i = 0; i < dt-> m_depcnt; i++ )
518 check_dep ( dt-> m_deparr [i], head, tail );
519 }
520}
521
522
523
524static int mod_insert ( char *mod, int argc, char **argv )
525{
526 struct mod_list_t *tail = 0;
527 struct mod_list_t *head = 0;
528 int rc;
529
530 // get dep list for module mod
531 check_dep ( mod, &head, &tail );
532
533 if ( head && tail ) {
534#if defined(CONFIG_FEATURE_2_6_MODULES)
535 if ( argc ) {
536 int i;
537 int l = 0;
538
539 // append module args
540 for ( i = 0; i < argc; i++ )
541 l += ( bb_strlen ( argv [i] ) + 1 );
542
543 head-> m_options = xrealloc ( head-> m_options, l + 1 );
544 head-> m_options [0] = 0;
545
546 for ( i = 0; i < argc; i++ ) {
547 strcat ( head-> m_options, argv [i] );
548 strcat ( head-> m_options, " " );
549 }
550 }
551#endif
552
553 // process tail ---> head
554 rc = mod_process ( tail, 1 );
555 }
556 else
557 rc = 1;
558
559 return rc;
560}
561
562static int mod_remove ( char *mod )
563{
564 int rc;
565 static struct mod_list_t rm_a_dummy = { "-a", 0, 0 };
566
567 struct mod_list_t *head = 0;
568 struct mod_list_t *tail = 0;
569
570 if ( mod )
571 check_dep ( mod, &head, &tail );
572 else // autoclean
573 head = tail = &rm_a_dummy;
574
575 if ( head && tail )
576 rc = mod_process ( head, 0 ); // process head ---> tail
577 else
578 rc = 1;
579 return rc;
580
581}
582
583extern int modprobe_main(int argc, char** argv)
584{
585 int opt;
586 int remove_opt = 0;
587
588 autoclean = show_only = quiet = do_syslog = verbose = 0;
589
590 while ((opt = getopt(argc, argv, "acdklnqrst:vVC:")) != -1) {
591 switch(opt) {
592 case 'c': // no config used
593 case 'l': // no pattern matching
594 return EXIT_SUCCESS;
595 break;
596 case 'C': // no config used
597 case 't': // no pattern matching
598 bb_error_msg_and_die("-t and -C not supported");
599
600 case 'a': // ignore
601 case 'd': // ignore
602 break;
603 case 'k':
604 autoclean++;
605 break;
606 case 'n':
607 show_only++;
608 break;
609 case 'q':
610 quiet++;
611 break;
612 case 'r':
613 remove_opt++;
614 break;
615 case 's':
616 do_syslog++;
617 break;
618 case 'v':
619 verbose++;
620 break;
621 case 'V':
622 default:
623 bb_show_usage();
624 break;
625 }
626 }
627
628 depend = build_dep ( );
629
630 if ( !depend )
631 bb_error_msg_and_die ( "could not parse modules.dep\n" );
632
633 if (remove_opt) {
634 int rc = EXIT_SUCCESS;
635 do {
636 if (mod_remove ( optind < argc ?
637 bb_xstrdup (argv [optind]) : NULL )) {
638 bb_error_msg ("failed to remove module %s",
639 argv [optind] );
640 rc = EXIT_FAILURE;
641 }
642 } while ( ++optind < argc );
643
644 return rc;
645 }
646
647 if (optind >= argc)
648 bb_error_msg_and_die ( "No module or pattern provided\n" );
649
650 if ( mod_insert ( bb_xstrdup ( argv [optind] ), argc - optind - 1, argv + optind + 1 ))
651 bb_error_msg_and_die ( "failed to load module %s", argv [optind] );
652
653 return EXIT_SUCCESS;
654}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-15 07:33:02 +0000