1 /*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: releng/8.2/sys/boot/common/module.c 202343 2010-01-15 11:26:20Z nyan $");
29
30 /*
31 * file/module function dispatcher, support, etc.
32 */
33
34 #include <stand.h>
35 #include <string.h>
36 #include <sys/param.h>
37 #include <sys/linker.h>
38 #include <sys/module.h>
39 #include <sys/queue.h>
40
41 #include "bootstrap.h"
42
43 #define MDIR_REMOVED 0x0001
44 #define MDIR_NOHINTS 0x0002
45
46 struct moduledir {
47 char *d_path; /* path of modules directory */
48 u_char *d_hints; /* content of linker.hints file */
49 int d_hintsz; /* size of hints data */
50 int d_flags;
51 STAILQ_ENTRY(moduledir) d_link;
52 };
53
54 static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
55 static int file_loadraw(char *type, char *name);
56 static int file_load_dependencies(struct preloaded_file *base_mod);
57 static char * file_search(const char *name, char **extlist);
58 static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
59 static int file_havepath(const char *name);
60 static char *mod_searchmodule(char *name, struct mod_depend *verinfo);
61 static void file_insert_tail(struct preloaded_file *mp);
62 struct file_metadata* metadata_next(struct file_metadata *base_mp, int type);
63 static void moduledir_readhints(struct moduledir *mdp);
64 static void moduledir_rebuild(void);
65
66 /* load address should be tweaked by first module loaded (kernel) */
67 static vm_offset_t loadaddr = 0;
68
69 static const char *default_searchpath ="/boot/kernel;/boot/modules";
70
71 static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list);
72
73 struct preloaded_file *preloaded_files = NULL;
74
75 static char *kld_ext_list[] = {
76 ".ko",
77 "",
78 ".debug",
79 NULL
80 };
81
82
83 /*
84 * load an object, either a disk file or code module.
85 *
86 * To load a file, the syntax is:
87 *
88 * load -t <type> <path>
89 *
90 * code modules are loaded as:
91 *
92 * load <path> <options>
93 */
94
95 COMMAND_SET(load, "load", "load a kernel or module", command_load);
96
97 static int
98 command_load(int argc, char *argv[])
99 {
100 char *typestr;
101 int dofile, dokld, ch, error;
102
103 dokld = dofile = 0;
104 optind = 1;
105 optreset = 1;
106 typestr = NULL;
107 if (argc == 1) {
108 command_errmsg = "no filename specified";
109 return(CMD_ERROR);
110 }
111 while ((ch = getopt(argc, argv, "kt:")) != -1) {
112 switch(ch) {
113 case 'k':
114 dokld = 1;
115 break;
116 case 't':
117 typestr = optarg;
118 dofile = 1;
119 break;
120 case '?':
121 default:
122 /* getopt has already reported an error */
123 return(CMD_OK);
124 }
125 }
126 argv += (optind - 1);
127 argc -= (optind - 1);
128
129 /*
130 * Request to load a raw file?
131 */
132 if (dofile) {
133 if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
134 command_errmsg = "invalid load type";
135 return(CMD_ERROR);
136 }
137 return(file_loadraw(typestr, argv[1]));
138 }
139 /*
140 * Do we have explicit KLD load ?
141 */
142 if (dokld || file_havepath(argv[1])) {
143 error = mod_loadkld(argv[1], argc - 2, argv + 2);
144 if (error == EEXIST)
145 sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]);
146 return (error == 0 ? CMD_OK : CMD_ERROR);
147 }
148 /*
149 * Looks like a request for a module.
150 */
151 error = mod_load(argv[1], NULL, argc - 2, argv + 2);
152 if (error == EEXIST)
153 sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]);
154 return (error == 0 ? CMD_OK : CMD_ERROR);
155 }
156
157 COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli);
158
159 static int
160 command_load_geli(int argc, char *argv[])
161 {
162 char typestr[80];
163 char *cp;
164 int ch, num;
165
166 if (argc < 3) {
167 command_errmsg = "usage is [-n key#] <prov> <file>";
168 return(CMD_ERROR);
169 }
170
171 num = 0;
172 optind = 1;
173 optreset = 1;
174 while ((ch = getopt(argc, argv, "n:")) != -1) {
175 switch(ch) {
176 case 'n':
177 num = strtol(optarg, &cp, 0);
178 if (cp == optarg) {
179 sprintf(command_errbuf, "bad key index '%s'", optarg);
180 return(CMD_ERROR);
181 }
182 break;
183 case '?':
184 default:
185 /* getopt has already reported an error */
186 return(CMD_OK);
187 }
188 }
189 argv += (optind - 1);
190 argc -= (optind - 1);
191 sprintf(typestr, "%s:geli_keyfile%d", argv[1], num);
192 return(file_loadraw(typestr, argv[2]));
193 }
194
195 COMMAND_SET(unload, "unload", "unload all modules", command_unload);
196
197 static int
198 command_unload(int argc, char *argv[])
199 {
200 struct preloaded_file *fp;
201
202 while (preloaded_files != NULL) {
203 fp = preloaded_files;
204 preloaded_files = preloaded_files->f_next;
205 file_discard(fp);
206 }
207 loadaddr = 0;
208 unsetenv("kernelname");
209 return(CMD_OK);
210 }
211
212 COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
213
214 static int
215 command_lsmod(int argc, char *argv[])
216 {
217 struct preloaded_file *fp;
218 struct kernel_module *mp;
219 struct file_metadata *md;
220 char lbuf[80];
221 int ch, verbose;
222
223 verbose = 0;
224 optind = 1;
225 optreset = 1;
226 while ((ch = getopt(argc, argv, "v")) != -1) {
227 switch(ch) {
228 case 'v':
229 verbose = 1;
230 break;
231 case '?':
232 default:
233 /* getopt has already reported an error */
234 return(CMD_OK);
235 }
236 }
237
238 pager_open();
239 for (fp = preloaded_files; fp; fp = fp->f_next) {
240 sprintf(lbuf, " %p: %s (%s, 0x%lx)\n",
241 (void *) fp->f_addr, fp->f_name, fp->f_type, (long) fp->f_size);
242 pager_output(lbuf);
243 if (fp->f_args != NULL) {
244 pager_output(" args: ");
245 pager_output(fp->f_args);
246 pager_output("\n");
247 }
248 if (fp->f_modules) {
249 pager_output(" modules: ");
250 for (mp = fp->f_modules; mp; mp = mp->m_next) {
251 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version);
252 pager_output(lbuf);
253 }
254 pager_output("\n");
255 }
256 if (verbose) {
257 /* XXX could add some formatting smarts here to display some better */
258 for (md = fp->f_metadata; md != NULL; md = md->md_next) {
259 sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
260 pager_output(lbuf);
261 }
262 }
263 }
264 pager_close();
265 return(CMD_OK);
266 }
267
268 /*
269 * File level interface, functions file_*
270 */
271 int
272 file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
273 {
274 struct preloaded_file *fp;
275 int error;
276 int i;
277
278 error = EFTYPE;
279 for (i = 0, fp = NULL; file_formats[i] && fp == NULL; i++) {
280 error = (file_formats[i]->l_load)(filename, loadaddr, &fp);
281 if (error == 0) {
282 fp->f_loader = i; /* remember the loader */
283 *result = fp;
284 break;
285 }
286 if (error == EFTYPE)
287 continue; /* Unknown to this handler? */
288 if (error) {
289 sprintf(command_errbuf, "can't load file '%s': %s",
290 filename, strerror(error));
291 break;
292 }
293 }
294 return (error);
295 }
296
297 static int
298 file_load_dependencies(struct preloaded_file *base_file) {
299 struct file_metadata *md;
300 struct preloaded_file *fp;
301 struct mod_depend *verinfo;
302 struct kernel_module *mp;
303 char *dmodname;
304 int error;
305
306 md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
307 if (md == NULL)
308 return (0);
309 error = 0;
310 do {
311 verinfo = (struct mod_depend*)md->md_data;
312 dmodname = (char *)(verinfo + 1);
313 if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
314 printf("loading required module '%s'\n", dmodname);
315 error = mod_load(dmodname, verinfo, 0, NULL);
316 if (error)
317 break;
318 /*
319 * If module loaded via kld name which isn't listed
320 * in the linker.hints file, we should check if it have
321 * required version.
322 */
323 mp = file_findmodule(NULL, dmodname, verinfo);
324 if (mp == NULL) {
325 sprintf(command_errbuf, "module '%s' exists but with wrong version",
326 dmodname);
327 error = ENOENT;
328 break;
329 }
330 }
331 md = metadata_next(md, MODINFOMD_DEPLIST);
332 } while (md);
333 if (!error)
334 return (0);
335 /* Load failed; discard everything */
336 while (base_file != NULL) {
337 fp = base_file;
338 base_file = base_file->f_next;
339 file_discard(fp);
340 }
341 return (error);
342 }
343 /*
344 * We've been asked to load (name) as (type), so just suck it in,
345 * no arguments or anything.
346 */
347 int
348 file_loadraw(char *type, char *name)
349 {
350 struct preloaded_file *fp;
351 char *cp;
352 int fd, got;
353 vm_offset_t laddr;
354 #ifdef PC98
355 struct stat st;
356 #endif
357
358 /* We can't load first */
359 if ((file_findfile(NULL, NULL)) == NULL) {
360 command_errmsg = "can't load file before kernel";
361 return(CMD_ERROR);
362 }
363
364 /* locate the file on the load path */
365 cp = file_search(name, NULL);
366 if (cp == NULL) {
367 sprintf(command_errbuf, "can't find '%s'", name);
368 return(CMD_ERROR);
369 }
370 name = cp;
371
372 if ((fd = open(name, O_RDONLY)) < 0) {
373 sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno));
374 free(name);
375 return(CMD_ERROR);
376 }
377
378 #ifdef PC98
379 /* We cannot use 15M-16M area on pc98. */
380 if (loadaddr < 0x1000000 &&
381 fstat(fd, &st) == 0 &&
382 (st.st_size == -1 || loadaddr + st.st_size > 0xf00000))
383 loadaddr = 0x1000000;
384 #endif
385
386 laddr = loadaddr;
387 for (;;) {
388 /* read in 4k chunks; size is not really important */
389 got = archsw.arch_readin(fd, laddr, 4096);
390 if (got == 0) /* end of file */
391 break;
392 if (got < 0) { /* error */
393 sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno));
394 free(name);
395 close(fd);
396 return(CMD_ERROR);
397 }
398 laddr += got;
399 }
400
401 /* Looks OK so far; create & populate control structure */
402 fp = file_alloc();
403 fp->f_name = name;
404 fp->f_type = strdup(type);
405 fp->f_args = NULL;
406 fp->f_metadata = NULL;
407 fp->f_loader = -1;
408 fp->f_addr = loadaddr;
409 fp->f_size = laddr - loadaddr;
410
411 /* recognise space consumption */
412 loadaddr = laddr;
413
414 /* Add to the list of loaded files */
415 file_insert_tail(fp);
416 close(fd);
417 return(CMD_OK);
418 }
419
420 /*
421 * Load the module (name), pass it (argc),(argv), add container file
422 * to the list of loaded files.
423 * If module is already loaded just assign new argc/argv.
424 */
425 int
426 mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
427 {
428 struct kernel_module *mp;
429 int err;
430 char *filename;
431
432 if (file_havepath(modname)) {
433 printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
434 return (mod_loadkld(modname, argc, argv));
435 }
436 /* see if module is already loaded */
437 mp = file_findmodule(NULL, modname, verinfo);
438 if (mp) {
439 #ifdef moduleargs
440 if (mp->m_args)
441 free(mp->m_args);
442 mp->m_args = unargv(argc, argv);
443 #endif
444 sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name);
445 return (0);
446 }
447 /* locate file with the module on the search path */
448 filename = mod_searchmodule(modname, verinfo);
449 if (filename == NULL) {
450 sprintf(command_errbuf, "can't find '%s'", modname);
451 return (ENOENT);
452 }
453 err = mod_loadkld(filename, argc, argv);
454 return (err);
455 }
456
457 /*
458 * Load specified KLD. If path is omitted, then try to locate it via
459 * search path.
460 */
461 int
462 mod_loadkld(const char *kldname, int argc, char *argv[])
463 {
464 struct preloaded_file *fp, *last_file;
465 int err;
466 char *filename;
467
468 /*
469 * Get fully qualified KLD name
470 */
471 filename = file_search(kldname, kld_ext_list);
472 if (filename == NULL) {
473 sprintf(command_errbuf, "can't find '%s'", kldname);
474 return (ENOENT);
475 }
476 /*
477 * Check if KLD already loaded
478 */
479 fp = file_findfile(filename, NULL);
480 if (fp) {
481 sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename);
482 free(filename);
483 return (0);
484 }
485 for (last_file = preloaded_files;
486 last_file != NULL && last_file->f_next != NULL;
487 last_file = last_file->f_next)
488 ;
489
490 do {
491 #ifdef PC98
492 /* We cannot use 15M-16M area on pc98. */
493 struct stat st;
494 if (loadaddr < 0x1000000 &&
495 stat(filename, &st) == 0 &&
496 (st.st_size == -1 || loadaddr + st.st_size > 0xf00000))
497 loadaddr = 0x1000000;
498 #endif
499 err = file_load(filename, loadaddr, &fp);
500 if (err)
501 break;
502 fp->f_args = unargv(argc, argv);
503 loadaddr = fp->f_addr + fp->f_size;
504 file_insert_tail(fp); /* Add to the list of loaded files */
505 if (file_load_dependencies(fp) != 0) {
506 err = ENOENT;
507 last_file->f_next = NULL;
508 loadaddr = last_file->f_addr + last_file->f_size;
509 fp = NULL;
510 break;
511 }
512 } while(0);
513 if (err == EFTYPE)
514 sprintf(command_errbuf, "don't know how to load module '%s'", filename);
515 if (err && fp)
516 file_discard(fp);
517 free(filename);
518 return (err);
519 }
520
521 /*
522 * Find a file matching (name) and (type).
523 * NULL may be passed as a wildcard to either.
524 */
525 struct preloaded_file *
526 file_findfile(char *name, char *type)
527 {
528 struct preloaded_file *fp;
529
530 for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
531 if (((name == NULL) || !strcmp(name, fp->f_name)) &&
532 ((type == NULL) || !strcmp(type, fp->f_type)))
533 break;
534 }
535 return (fp);
536 }
537
538 /*
539 * Find a module matching (name) inside of given file.
540 * NULL may be passed as a wildcard.
541 */
542 struct kernel_module *
543 file_findmodule(struct preloaded_file *fp, char *modname,
544 struct mod_depend *verinfo)
545 {
546 struct kernel_module *mp, *best;
547 int bestver, mver;
548
549 if (fp == NULL) {
550 for (fp = preloaded_files; fp; fp = fp->f_next) {
551 mp = file_findmodule(fp, modname, verinfo);
552 if (mp)
553 return (mp);
554 }
555 return (NULL);
556 }
557 best = NULL;
558 bestver = 0;
559 for (mp = fp->f_modules; mp; mp = mp->m_next) {
560 if (strcmp(modname, mp->m_name) == 0) {
561 if (verinfo == NULL)
562 return (mp);
563 mver = mp->m_version;
564 if (mver == verinfo->md_ver_preferred)
565 return (mp);
566 if (mver >= verinfo->md_ver_minimum &&
567 mver <= verinfo->md_ver_maximum &&
568 mver > bestver) {
569 best = mp;
570 bestver = mver;
571 }
572 }
573 }
574 return (best);
575 }
576 /*
577 * Make a copy of (size) bytes of data from (p), and associate them as
578 * metadata of (type) to the module (mp).
579 */
580 void
581 file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
582 {
583 struct file_metadata *md;
584
585 md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
586 md->md_size = size;
587 md->md_type = type;
588 bcopy(p, md->md_data, size);
589 md->md_next = fp->f_metadata;
590 fp->f_metadata = md;
591 }
592
593 /*
594 * Find a metadata object of (type) associated with the file (fp)
595 */
596 struct file_metadata *
597 file_findmetadata(struct preloaded_file *fp, int type)
598 {
599 struct file_metadata *md;
600
601 for (md = fp->f_metadata; md != NULL; md = md->md_next)
602 if (md->md_type == type)
603 break;
604 return(md);
605 }
606
607 struct file_metadata *
608 metadata_next(struct file_metadata *md, int type)
609 {
610 if (md == NULL)
611 return (NULL);
612 while((md = md->md_next) != NULL)
613 if (md->md_type == type)
614 break;
615 return (md);
616 }
617
618 static char *emptyextlist[] = { "", NULL };
619
620 /*
621 * Check if the given file is in place and return full path to it.
622 */
623 static char *
624 file_lookup(const char *path, const char *name, int namelen, char **extlist)
625 {
626 struct stat st;
627 char *result, *cp, **cpp;
628 int pathlen, extlen, len;
629
630 pathlen = strlen(path);
631 extlen = 0;
632 if (extlist == NULL)
633 extlist = emptyextlist;
634 for (cpp = extlist; *cpp; cpp++) {
635 len = strlen(*cpp);
636 if (len > extlen)
637 extlen = len;
638 }
639 result = malloc(pathlen + namelen + extlen + 2);
640 if (result == NULL)
641 return (NULL);
642 bcopy(path, result, pathlen);
643 if (pathlen > 0 && result[pathlen - 1] != '/')
644 result[pathlen++] = '/';
645 cp = result + pathlen;
646 bcopy(name, cp, namelen);
647 cp += namelen;
648 for (cpp = extlist; *cpp; cpp++) {
649 strcpy(cp, *cpp);
650 if (stat(result, &st) == 0 && S_ISREG(st.st_mode))
651 return result;
652 }
653 free(result);
654 return NULL;
655 }
656
657 /*
658 * Check if file name have any qualifiers
659 */
660 static int
661 file_havepath(const char *name)
662 {
663 const char *cp;
664
665 archsw.arch_getdev(NULL, name, &cp);
666 return (cp != name || strchr(name, '/') != NULL);
667 }
668
669 /*
670 * Attempt to find the file (name) on the module searchpath.
671 * If (name) is qualified in any way, we simply check it and
672 * return it or NULL. If it is not qualified, then we attempt
673 * to construct a path using entries in the environment variable
674 * module_path.
675 *
676 * The path we return a pointer to need never be freed, as we manage
677 * it internally.
678 */
679 static char *
680 file_search(const char *name, char **extlist)
681 {
682 struct moduledir *mdp;
683 struct stat sb;
684 char *result;
685 int namelen;
686
687 /* Don't look for nothing */
688 if (name == NULL)
689 return(NULL);
690
691 if (*name == 0)
692 return(strdup(name));
693
694 if (file_havepath(name)) {
695 /* Qualified, so just see if it exists */
696 if (stat(name, &sb) == 0)
697 return(strdup(name));
698 return(NULL);
699 }
700 moduledir_rebuild();
701 result = NULL;
702 namelen = strlen(name);
703 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
704 result = file_lookup(mdp->d_path, name, namelen, extlist);
705 if (result)
706 break;
707 }
708 return(result);
709 }
710
711 #define INT_ALIGN(base, ptr) ptr = \
712 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
713
714 static char *
715 mod_search_hints(struct moduledir *mdp, const char *modname,
716 struct mod_depend *verinfo)
717 {
718 u_char *cp, *recptr, *bufend, *best;
719 char *result;
720 int *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
721
722 moduledir_readhints(mdp);
723 modnamelen = strlen(modname);
724 found = 0;
725 result = NULL;
726 bestver = 0;
727 if (mdp->d_hints == NULL)
728 goto bad;
729 recptr = mdp->d_hints;
730 bufend = recptr + mdp->d_hintsz;
731 clen = blen = 0;
732 best = cp = NULL;
733 while (recptr < bufend && !found) {
734 intp = (int*)recptr;
735 reclen = *intp++;
736 ival = *intp++;
737 cp = (char*)intp;
738 switch (ival) {
739 case MDT_VERSION:
740 clen = *cp++;
741 if (clen != modnamelen || bcmp(cp, modname, clen) != 0)
742 break;
743 cp += clen;
744 INT_ALIGN(mdp->d_hints, cp);
745 ival = *(int*)cp;
746 cp += sizeof(int);
747 clen = *cp++;
748 if (verinfo == NULL || ival == verinfo->md_ver_preferred) {
749 found = 1;
750 break;
751 }
752 if (ival >= verinfo->md_ver_minimum &&
753 ival <= verinfo->md_ver_maximum &&
754 ival > bestver) {
755 bestver = ival;
756 best = cp;
757 blen = clen;
758 }
759 break;
760 default:
761 break;
762 }
763 recptr += reclen + sizeof(int);
764 }
765 /*
766 * Finally check if KLD is in the place
767 */
768 if (found)
769 result = file_lookup(mdp->d_path, cp, clen, NULL);
770 else if (best)
771 result = file_lookup(mdp->d_path, best, blen, NULL);
772 bad:
773 /*
774 * If nothing found or hints is absent - fallback to the old way
775 * by using "kldname[.ko]" as module name.
776 */
777 if (!found && !bestver && result == NULL)
778 result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
779 return result;
780 }
781
782 /*
783 * Attempt to locate the file containing the module (name)
784 */
785 static char *
786 mod_searchmodule(char *name, struct mod_depend *verinfo)
787 {
788 struct moduledir *mdp;
789 char *result;
790
791 moduledir_rebuild();
792 /*
793 * Now we ready to lookup module in the given directories
794 */
795 result = NULL;
796 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
797 result = mod_search_hints(mdp, name, verinfo);
798 if (result)
799 break;
800 }
801
802 return(result);
803 }
804
805 int
806 file_addmodule(struct preloaded_file *fp, char *modname, int version,
807 struct kernel_module **newmp)
808 {
809 struct kernel_module *mp;
810 struct mod_depend mdepend;
811
812 bzero(&mdepend, sizeof(mdepend));
813 mdepend.md_ver_preferred = version;
814 mp = file_findmodule(fp, modname, &mdepend);
815 if (mp)
816 return (EEXIST);
817 mp = malloc(sizeof(struct kernel_module));
818 if (mp == NULL)
819 return (ENOMEM);
820 bzero(mp, sizeof(struct kernel_module));
821 mp->m_name = strdup(modname);
822 mp->m_version = version;
823 mp->m_fp = fp;
824 mp->m_next = fp->f_modules;
825 fp->f_modules = mp;
826 if (newmp)
827 *newmp = mp;
828 return (0);
829 }
830
831 /*
832 * Throw a file away
833 */
834 void
835 file_discard(struct preloaded_file *fp)
836 {
837 struct file_metadata *md, *md1;
838 struct kernel_module *mp, *mp1;
839 if (fp == NULL)
840 return;
841 md = fp->f_metadata;
842 while (md) {
843 md1 = md;
844 md = md->md_next;
845 free(md1);
846 }
847 mp = fp->f_modules;
848 while (mp) {
849 if (mp->m_name)
850 free(mp->m_name);
851 mp1 = mp;
852 mp = mp->m_next;
853 free(mp1);
854 }
855 if (fp->f_name != NULL)
856 free(fp->f_name);
857 if (fp->f_type != NULL)
858 free(fp->f_type);
859 if (fp->f_args != NULL)
860 free(fp->f_args);
861 free(fp);
862 }
863
864 /*
865 * Allocate a new file; must be used instead of malloc()
866 * to ensure safe initialisation.
867 */
868 struct preloaded_file *
869 file_alloc(void)
870 {
871 struct preloaded_file *fp;
872
873 if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) {
874 bzero(fp, sizeof(struct preloaded_file));
875 }
876 return (fp);
877 }
878
879 /*
880 * Add a module to the chain
881 */
882 static void
883 file_insert_tail(struct preloaded_file *fp)
884 {
885 struct preloaded_file *cm;
886
887 /* Append to list of loaded file */
888 fp->f_next = NULL;
889 if (preloaded_files == NULL) {
890 preloaded_files = fp;
891 } else {
892 for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
893 ;
894 cm->f_next = fp;
895 }
896 }
897
898 static char *
899 moduledir_fullpath(struct moduledir *mdp, const char *fname)
900 {
901 char *cp;
902
903 cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
904 if (cp == NULL)
905 return NULL;
906 strcpy(cp, mdp->d_path);
907 strcat(cp, "/");
908 strcat(cp, fname);
909 return (cp);
910 }
911
912 /*
913 * Read linker.hints file into memory performing some sanity checks.
914 */
915 static void
916 moduledir_readhints(struct moduledir *mdp)
917 {
918 struct stat st;
919 char *path;
920 int fd, size, version;
921
922 if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
923 return;
924 path = moduledir_fullpath(mdp, "linker.hints");
925 if (stat(path, &st) != 0 ||
926 st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
927 st.st_size > 100 * 1024 || (fd = open(path, O_RDONLY)) < 0) {
928 free(path);
929 mdp->d_flags |= MDIR_NOHINTS;
930 return;
931 }
932 free(path);
933 size = read(fd, &version, sizeof(version));
934 if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
935 goto bad;
936 size = st.st_size - size;
937 mdp->d_hints = malloc(size);
938 if (mdp->d_hints == NULL)
939 goto bad;
940 if (read(fd, mdp->d_hints, size) != size)
941 goto bad;
942 mdp->d_hintsz = size;
943 close(fd);
944 return;
945 bad:
946 close(fd);
947 if (mdp->d_hints) {
948 free(mdp->d_hints);
949 mdp->d_hints = NULL;
950 }
951 mdp->d_flags |= MDIR_NOHINTS;
952 return;
953 }
954
955 /*
956 * Extract directories from the ';' separated list, remove duplicates.
957 */
958 static void
959 moduledir_rebuild(void)
960 {
961 struct moduledir *mdp, *mtmp;
962 const char *path, *cp, *ep;
963 int cplen;
964
965 path = getenv("module_path");
966 if (path == NULL)
967 path = default_searchpath;
968 /*
969 * Rebuild list of module directories if it changed
970 */
971 STAILQ_FOREACH(mdp, &moduledir_list, d_link)
972 mdp->d_flags |= MDIR_REMOVED;
973
974 for (ep = path; *ep != 0; ep++) {
975 cp = ep;
976 for (; *ep != 0 && *ep != ';'; ep++)
977 ;
978 /*
979 * Ignore trailing slashes
980 */
981 for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
982 ;
983 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
984 if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
985 continue;
986 mdp->d_flags &= ~MDIR_REMOVED;
987 break;
988 }
989 if (mdp == NULL) {
990 mdp = malloc(sizeof(*mdp) + cplen + 1);
991 if (mdp == NULL)
992 return;
993 mdp->d_path = (char*)(mdp + 1);
994 bcopy(cp, mdp->d_path, cplen);
995 mdp->d_path[cplen] = 0;
996 mdp->d_hints = NULL;
997 mdp->d_flags = 0;
998 STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
999 }
1000 if (*ep == 0)
1001 break;
1002 }
1003 /*
1004 * Delete unused directories if any
1005 */
1006 mdp = STAILQ_FIRST(&moduledir_list);
1007 while (mdp) {
1008 if ((mdp->d_flags & MDIR_REMOVED) == 0) {
1009 mdp = STAILQ_NEXT(mdp, d_link);
1010 } else {
1011 if (mdp->d_hints)
1012 free(mdp->d_hints);
1013 mtmp = mdp;
1014 mdp = STAILQ_NEXT(mdp, d_link);
1015 STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);
1016 free(mtmp);
1017 }
1018 }
1019 return;
1020 }
Cache object: 7b47fbfb5523d493daf61adb6e6f3119
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