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#include <sys/stdint.h>
41
42#include "bootstrap.h"
43
44#define MDIR_REMOVED 0x0001
45#define MDIR_NOHINTS 0x0002
46
47struct moduledir {
48 char *d_path; /* path of modules directory */
49 u_char *d_hints; /* content of linker.hints file */
50 int d_hintsz; /* size of hints data */
51 int d_flags;
52 STAILQ_ENTRY(moduledir) d_link;
53};
54
55static int file_load(char *filename, vm_offset_t dest, struct preloaded_file **result);
56static int file_load_dependencies(struct preloaded_file *base_mod);
57static char * file_search(const char *name, char **extlist);
58static struct kernel_module * file_findmodule(struct preloaded_file *fp, char *modname, struct mod_depend *verinfo);
59static int file_havepath(const char *name);
60static char *mod_searchmodule(char *name, struct mod_depend *verinfo);
61static void file_insert_tail(struct preloaded_file *mp);
62struct file_metadata* metadata_next(struct file_metadata *base_mp, int type);
63static void moduledir_readhints(struct moduledir *mdp);
64static void moduledir_rebuild(void);
65
66/* load address should be tweaked by first module loaded (kernel) */
67static vm_offset_t loadaddr = 0;
68
69#if defined(LOADER_FDT_SUPPORT)
70static const char *default_searchpath =
71 "/boot/kernel;/boot/modules;/boot/dtb";
72#else
73static const char *default_searchpath ="/boot/kernel;/boot/modules";
74#endif
75
76static STAILQ_HEAD(, moduledir) moduledir_list = STAILQ_HEAD_INITIALIZER(moduledir_list);
77
78struct preloaded_file *preloaded_files = NULL;
79
80static char *kld_ext_list[] = {
81 ".ko",
82 "",
83 ".debug",
84 NULL
85};
86
87
88/*
89 * load an object, either a disk file or code module.
90 *
91 * To load a file, the syntax is:
92 *
93 * load -t <type> <path>
94 *
95 * code modules are loaded as:
96 *
97 * load <path> <options>
98 */
99
100COMMAND_SET(load, "load", "load a kernel or module", command_load);
101
102static int
103command_load(int argc, char *argv[])
104{
105 struct preloaded_file *fp;
106 char *typestr;
107 int dofile, dokld, ch, error;
108
109 dokld = dofile = 0;
110 optind = 1;
111 optreset = 1;
112 typestr = NULL;
113 if (argc == 1) {
114 command_errmsg = "no filename specified";
115 return (CMD_CRIT);
116 }
117 while ((ch = getopt(argc, argv, "kt:")) != -1) {
118 switch(ch) {
119 case 'k':
120 dokld = 1;
121 break;
122 case 't':
123 typestr = optarg;
124 dofile = 1;
125 break;
126 case '?':
127 default:
128 /* getopt has already reported an error */
129 return (CMD_OK);
130 }
131 }
132 argv += (optind - 1);
133 argc -= (optind - 1);
134
135 /*
136 * Request to load a raw file?
137 */
138 if (dofile) {
139 if ((argc != 2) || (typestr == NULL) || (*typestr == 0)) {
140 command_errmsg = "invalid load type";
141 return (CMD_CRIT);
142 }
143
144 fp = file_findfile(argv[1], typestr);
145 if (fp) {
146 sprintf(command_errbuf, "warning: file '%s' already loaded", argv[1]);
147 return (CMD_WARN);
148 }
149
150 if (file_loadraw(argv[1], typestr, 1) != NULL)
151 return (CMD_OK);
152
153 /* Failing to load mfs_root is never going to end well! */
154 if (strcmp("mfs_root", typestr) == 0)
155 return (CMD_FATAL);
156
157 return (CMD_ERROR);
158 }
159 /*
160 * Do we have explicit KLD load ?
161 */
162 if (dokld || file_havepath(argv[1])) {
163 error = mod_loadkld(argv[1], argc - 2, argv + 2);
164 if (error == EEXIST) {
165 sprintf(command_errbuf, "warning: KLD '%s' already loaded", argv[1]);
166 return (CMD_WARN);
167 }
168
169 return (error == 0 ? CMD_OK : CMD_CRIT);
170 }
171 /*
172 * Looks like a request for a module.
173 */
174 error = mod_load(argv[1], NULL, argc - 2, argv + 2);
175 if (error == EEXIST) {
176 sprintf(command_errbuf, "warning: module '%s' already loaded", argv[1]);
177 return (CMD_WARN);
178 }
179
180 return (error == 0 ? CMD_OK : CMD_CRIT);
181}
182
183COMMAND_SET(load_geli, "load_geli", "load a geli key", command_load_geli);
184
185static int
186command_load_geli(int argc, char *argv[])
187{
188 char typestr[80];
189 char *cp;
190 int ch, num;
191
192 if (argc < 3) {
193 command_errmsg = "usage is [-n key#] <prov> <file>";
194 return(CMD_ERROR);
195 }
196
197 num = 0;
198 optind = 1;
199 optreset = 1;
200 while ((ch = getopt(argc, argv, "n:")) != -1) {
201 switch(ch) {
202 case 'n':
203 num = strtol(optarg, &cp, 0);
204 if (cp == optarg) {
205 sprintf(command_errbuf, "bad key index '%s'", optarg);
206 return(CMD_ERROR);
207 }
208 break;
209 case '?':
210 default:
211 /* getopt has already reported an error */
212 return(CMD_OK);
213 }
214 }
215 argv += (optind - 1);
216 argc -= (optind - 1);
217 sprintf(typestr, "%s:geli_keyfile%d", argv[1], num);
218 return (file_loadraw(argv[2], typestr, 1) ? CMD_OK : CMD_ERROR);
219}
220
221void
222unload(void)
223{
224 struct preloaded_file *fp;
225
226 while (preloaded_files != NULL) {
227 fp = preloaded_files;
228 preloaded_files = preloaded_files->f_next;
229 file_discard(fp);
230 }
231 loadaddr = 0;
232 unsetenv("kernelname");
233}
234
235COMMAND_SET(unload, "unload", "unload all modules", command_unload);
236
237static int
238command_unload(int argc, char *argv[])
239{
240 unload();
241 return(CMD_OK);
242}
243
244COMMAND_SET(lsmod, "lsmod", "list loaded modules", command_lsmod);
245
246static int
247command_lsmod(int argc, char *argv[])
248{
249 struct preloaded_file *fp;
250 struct kernel_module *mp;
251 struct file_metadata *md;
252 char lbuf[80];
253 int ch, verbose;
254
255 verbose = 0;
256 optind = 1;
257 optreset = 1;
258 while ((ch = getopt(argc, argv, "v")) != -1) {
259 switch(ch) {
260 case 'v':
261 verbose = 1;
262 break;
263 case '?':
264 default:
265 /* getopt has already reported an error */
266 return(CMD_OK);
267 }
268 }
269
270 pager_open();
271 for (fp = preloaded_files; fp; fp = fp->f_next) {
272 sprintf(lbuf, " %p: ", (void *) fp->f_addr);
273 pager_output(lbuf);
274 pager_output(fp->f_name);
275 sprintf(lbuf, " (%s, 0x%lx)\n", fp->f_type, (long)fp->f_size);
276 pager_output(lbuf);
277 if (fp->f_args != NULL) {
278 pager_output(" args: ");
279 pager_output(fp->f_args);
280 pager_output("\n");
281 }
282 if (fp->f_modules) {
283 pager_output(" modules: ");
284 for (mp = fp->f_modules; mp; mp = mp->m_next) {
285 sprintf(lbuf, "%s.%d ", mp->m_name, mp->m_version);
286 pager_output(lbuf);
287 }
288 pager_output("\n");
289 }
290 if (verbose) {
291 /* XXX could add some formatting smarts here to display some better */
292 for (md = fp->f_metadata; md != NULL; md = md->md_next) {
293 sprintf(lbuf, " 0x%04x, 0x%lx\n", md->md_type, (long) md->md_size);
294 pager_output(lbuf);
295 }
296 }
297 }
298 pager_close();
299 return(CMD_OK);
300}
301
302/*
303 * File level interface, functions file_*
304 */
305int
306file_load(char *filename, vm_offset_t dest, struct preloaded_file **result)
307{
308 static int last_file_format = 0;
309 struct preloaded_file *fp;
310 int error;
311 int i;
312
313 if (archsw.arch_loadaddr != NULL)
314 dest = archsw.arch_loadaddr(LOAD_RAW, filename, dest);
315
316 error = EFTYPE;
317 for (i = last_file_format, fp = NULL;
318 file_formats[i] && fp == NULL; i++) {
319 error = (file_formats[i]->l_load)(filename, dest, &fp);
320 if (error == 0) {
321 fp->f_loader = last_file_format = i; /* remember the loader */
322 *result = fp;
323 break;
324 } else if (last_file_format == i && i != 0) {
325 /* Restart from the beginning */
326 i = -1;
327 last_file_format = 0;
328 fp = NULL;
329 continue;
330 }
331 if (error == EFTYPE)
332 continue; /* Unknown to this handler? */
333 if (error) {
334 sprintf(command_errbuf, "can't load file '%s': %s",
335 filename, strerror(error));
336 break;
337 }
338 }
339 return (error);
340}
341
342static int
343file_load_dependencies(struct preloaded_file *base_file)
344{
345 struct file_metadata *md;
346 struct preloaded_file *fp;
347 struct mod_depend *verinfo;
348 struct kernel_module *mp;
349 char *dmodname;
350 int error;
351
352 md = file_findmetadata(base_file, MODINFOMD_DEPLIST);
353 if (md == NULL)
354 return (0);
355 error = 0;
356 do {
357 verinfo = (struct mod_depend*)md->md_data;
358 dmodname = (char *)(verinfo + 1);
359 if (file_findmodule(NULL, dmodname, verinfo) == NULL) {
360 printf("loading required module '%s'\n", dmodname);
361 error = mod_load(dmodname, verinfo, 0, NULL);
362 if (error)
363 break;
364 /*
365 * If module loaded via kld name which isn't listed
366 * in the linker.hints file, we should check if it have
367 * required version.
368 */
369 mp = file_findmodule(NULL, dmodname, verinfo);
370 if (mp == NULL) {
371 sprintf(command_errbuf, "module '%s' exists but with wrong version",
372 dmodname);
373 error = ENOENT;
374 break;
375 }
376 }
377 md = metadata_next(md, MODINFOMD_DEPLIST);
378 } while (md);
379 if (!error)
380 return (0);
381 /* Load failed; discard everything */
382 while (base_file != NULL) {
383 fp = base_file;
384 base_file = base_file->f_next;
385 file_discard(fp);
386 }
387 return (error);
388}
389
390/*
391 * We've been asked to load (fname) as (type), so just suck it in,
392 * no arguments or anything.
393 */
394struct preloaded_file *
395file_loadraw(const char *fname, char *type, int insert)
396{
397 struct preloaded_file *fp;
398 char *name;
399 int fd, got;
400 vm_offset_t laddr;
401
402 /* We can't load first */
403 if ((file_findfile(NULL, NULL)) == NULL) {
404 command_errmsg = "can't load file before kernel";
405 return(NULL);
406 }
407
408 /* locate the file on the load path */
409 name = file_search(fname, NULL);
410 if (name == NULL) {
411 sprintf(command_errbuf, "can't find '%s'", fname);
412 return(NULL);
413 }
414
415 if ((fd = open(name, O_RDONLY)) < 0) {
416 sprintf(command_errbuf, "can't open '%s': %s", name, strerror(errno));
417 free(name);
418 return(NULL);
419 }
420
421 if (archsw.arch_loadaddr != NULL)
422 loadaddr = archsw.arch_loadaddr(LOAD_RAW, name, loadaddr);
423
424 printf("%s ", name);
425
426 laddr = loadaddr;
427 for (;;) {
428 /* read in 4k chunks; size is not really important */
429 got = archsw.arch_readin(fd, laddr, 4096);
430 if (got == 0) /* end of file */
431 break;
432 if (got < 0) { /* error */
433 sprintf(command_errbuf, "error reading '%s': %s", name, strerror(errno));
434 free(name);
435 close(fd);
436 return(NULL);
437 }
438 laddr += got;
439 }
440
441 printf("size=%#jx\n", (uintmax_t)(laddr - loadaddr));
442
443 /* Looks OK so far; create & populate control structure */
444 fp = file_alloc();
445 fp->f_name = strdup(name);
446 fp->f_type = strdup(type);
447 fp->f_args = NULL;
448 fp->f_metadata = NULL;
449 fp->f_loader = -1;
450 fp->f_addr = loadaddr;
451 fp->f_size = laddr - loadaddr;
452
453 /* recognise space consumption */
454 loadaddr = laddr;
455
456 /* Add to the list of loaded files */
457 if (insert != 0)
458 file_insert_tail(fp);
459 close(fd);
460 return(fp);
461}
462
463/*
464 * Load the module (name), pass it (argc),(argv), add container file
465 * to the list of loaded files.
466 * If module is already loaded just assign new argc/argv.
467 */
468int
469mod_load(char *modname, struct mod_depend *verinfo, int argc, char *argv[])
470{
471 struct kernel_module *mp;
472 int err;
473 char *filename;
474
475 if (file_havepath(modname)) {
476 printf("Warning: mod_load() called instead of mod_loadkld() for module '%s'\n", modname);
477 return (mod_loadkld(modname, argc, argv));
478 }
479 /* see if module is already loaded */
480 mp = file_findmodule(NULL, modname, verinfo);
481 if (mp) {
482#ifdef moduleargs
483 if (mp->m_args)
484 free(mp->m_args);
485 mp->m_args = unargv(argc, argv);
486#endif
487 sprintf(command_errbuf, "warning: module '%s' already loaded", mp->m_name);
488 return (0);
489 }
490 /* locate file with the module on the search path */
491 filename = mod_searchmodule(modname, verinfo);
492 if (filename == NULL) {
493 sprintf(command_errbuf, "can't find '%s'", modname);
494 return (ENOENT);
495 }
496 err = mod_loadkld(filename, argc, argv);
497 return (err);
498}
499
500/*
501 * Load specified KLD. If path is omitted, then try to locate it via
502 * search path.
503 */
504int
505mod_loadkld(const char *kldname, int argc, char *argv[])
506{
507 struct preloaded_file *fp, *last_file;
508 int err;
509 char *filename;
510
511 /*
512 * Get fully qualified KLD name
513 */
514 filename = file_search(kldname, kld_ext_list);
515 if (filename == NULL) {
516 sprintf(command_errbuf, "can't find '%s'", kldname);
517 return (ENOENT);
518 }
519 /*
520 * Check if KLD already loaded
521 */
522 fp = file_findfile(filename, NULL);
523 if (fp) {
524 sprintf(command_errbuf, "warning: KLD '%s' already loaded", filename);
525 free(filename);
526 return (0);
527 }
528 for (last_file = preloaded_files;
529 last_file != NULL && last_file->f_next != NULL;
530 last_file = last_file->f_next)
531 ;
532
533 do {
534 err = file_load(filename, loadaddr, &fp);
535 if (err)
536 break;
537 fp->f_args = unargv(argc, argv);
538 loadaddr = fp->f_addr + fp->f_size;
539 file_insert_tail(fp); /* Add to the list of loaded files */
540 if (file_load_dependencies(fp) != 0) {
541 err = ENOENT;
542 last_file->f_next = NULL;
543 loadaddr = last_file->f_addr + last_file->f_size;
544 fp = NULL;
545 break;
546 }
547 } while(0);
548 if (err == EFTYPE)
549 sprintf(command_errbuf, "don't know how to load module '%s'", filename);
550 if (err && fp)
551 file_discard(fp);
552 free(filename);
553 return (err);
554}
555
556/*
557 * Find a file matching (name) and (type).
558 * NULL may be passed as a wildcard to either.
559 */
560struct preloaded_file *
561file_findfile(const char *name, const char *type)
562{
563 struct preloaded_file *fp;
564
565 for (fp = preloaded_files; fp != NULL; fp = fp->f_next) {
566 if (((name == NULL) || !strcmp(name, fp->f_name)) &&
567 ((type == NULL) || !strcmp(type, fp->f_type)))
568 break;
569 }
570 return (fp);
571}
572
573/*
574 * Find a module matching (name) inside of given file.
575 * NULL may be passed as a wildcard.
576 */
577struct kernel_module *
578file_findmodule(struct preloaded_file *fp, char *modname,
579 struct mod_depend *verinfo)
580{
581 struct kernel_module *mp, *best;
582 int bestver, mver;
583
584 if (fp == NULL) {
585 for (fp = preloaded_files; fp; fp = fp->f_next) {
586 mp = file_findmodule(fp, modname, verinfo);
587 if (mp)
588 return (mp);
589 }
590 return (NULL);
591 }
592 best = NULL;
593 bestver = 0;
594 for (mp = fp->f_modules; mp; mp = mp->m_next) {
595 if (strcmp(modname, mp->m_name) == 0) {
596 if (verinfo == NULL)
597 return (mp);
598 mver = mp->m_version;
599 if (mver == verinfo->md_ver_preferred)
600 return (mp);
601 if (mver >= verinfo->md_ver_minimum &&
602 mver <= verinfo->md_ver_maximum &&
603 mver > bestver) {
604 best = mp;
605 bestver = mver;
606 }
607 }
608 }
609 return (best);
610}
611/*
612 * Make a copy of (size) bytes of data from (p), and associate them as
613 * metadata of (type) to the module (mp).
614 */
615void
616file_addmetadata(struct preloaded_file *fp, int type, size_t size, void *p)
617{
618 struct file_metadata *md;
619
620 md = malloc(sizeof(struct file_metadata) - sizeof(md->md_data) + size);
621 md->md_size = size;
622 md->md_type = type;
623 bcopy(p, md->md_data, size);
624 md->md_next = fp->f_metadata;
625 fp->f_metadata = md;
626}
627
628/*
629 * Find a metadata object of (type) associated with the file (fp)
630 */
631struct file_metadata *
632file_findmetadata(struct preloaded_file *fp, int type)
633{
634 struct file_metadata *md;
635
636 for (md = fp->f_metadata; md != NULL; md = md->md_next)
637 if (md->md_type == type)
638 break;
639 return(md);
640}
641
642struct file_metadata *
643metadata_next(struct file_metadata *md, int type)
644{
645 if (md == NULL)
646 return (NULL);
647 while((md = md->md_next) != NULL)
648 if (md->md_type == type)
649 break;
650 return (md);
651}
652
653static char *emptyextlist[] = { "", NULL };
654
655/*
656 * Check if the given file is in place and return full path to it.
657 */
658static char *
659file_lookup(const char *path, const char *name, int namelen, char **extlist)
660{
661 struct stat st;
662 char *result, *cp, **cpp;
663 int pathlen, extlen, len;
664
665 pathlen = strlen(path);
666 extlen = 0;
667 if (extlist == NULL)
668 extlist = emptyextlist;
669 for (cpp = extlist; *cpp; cpp++) {
670 len = strlen(*cpp);
671 if (len > extlen)
672 extlen = len;
673 }
674 result = malloc(pathlen + namelen + extlen + 2);
675 if (result == NULL)
676 return (NULL);
677 bcopy(path, result, pathlen);
678 if (pathlen > 0 && result[pathlen - 1] != '/')
679 result[pathlen++] = '/';
680 cp = result + pathlen;
681 bcopy(name, cp, namelen);
682 cp += namelen;
683 for (cpp = extlist; *cpp; cpp++) {
684 strcpy(cp, *cpp);
685 if (stat(result, &st) == 0 && S_ISREG(st.st_mode))
686 return result;
687 }
688 free(result);
689 return NULL;
690}
691
692/*
693 * Check if file name have any qualifiers
694 */
695static int
696file_havepath(const char *name)
697{
698 const char *cp;
699
700 archsw.arch_getdev(NULL, name, &cp);
701 return (cp != name || strchr(name, '/') != NULL);
702}
703
704/*
705 * Attempt to find the file (name) on the module searchpath.
706 * If (name) is qualified in any way, we simply check it and
707 * return it or NULL. If it is not qualified, then we attempt
708 * to construct a path using entries in the environment variable
709 * module_path.
710 *
711 * The path we return a pointer to need never be freed, as we manage
712 * it internally.
713 */
714static char *
715file_search(const char *name, char **extlist)
716{
717 struct moduledir *mdp;
718 struct stat sb;
719 char *result;
720 int namelen;
721
722 /* Don't look for nothing */
723 if (name == NULL)
724 return(NULL);
725
726 if (*name == 0)
727 return(strdup(name));
728
729 if (file_havepath(name)) {
730 /* Qualified, so just see if it exists */
731 if (stat(name, &sb) == 0)
732 return(strdup(name));
733 return(NULL);
734 }
735 moduledir_rebuild();
736 result = NULL;
737 namelen = strlen(name);
738 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
739 result = file_lookup(mdp->d_path, name, namelen, extlist);
740 if (result)
741 break;
742 }
743 return(result);
744}
745
746#define INT_ALIGN(base, ptr) ptr = \
747 (base) + (((ptr) - (base) + sizeof(int) - 1) & ~(sizeof(int) - 1))
748
749static char *
750mod_search_hints(struct moduledir *mdp, const char *modname,
751 struct mod_depend *verinfo)
752{
753 u_char *cp, *recptr, *bufend, *best;
754 char *result;
755 int *intp, bestver, blen, clen, found, ival, modnamelen, reclen;
756
757 moduledir_readhints(mdp);
758 modnamelen = strlen(modname);
759 found = 0;
760 result = NULL;
761 bestver = 0;
762 if (mdp->d_hints == NULL)
763 goto bad;
764 recptr = mdp->d_hints;
765 bufend = recptr + mdp->d_hintsz;
766 clen = blen = 0;
767 best = cp = NULL;
768 while (recptr < bufend && !found) {
769 intp = (int*)recptr;
770 reclen = *intp++;
771 ival = *intp++;
|
807bad:
808 /*
809 * If nothing found or hints is absent - fallback to the old way
810 * by using "kldname[.ko]" as module name.
811 */
812 if (!found && !bestver && result == NULL)
813 result = file_lookup(mdp->d_path, modname, modnamelen, kld_ext_list);
814 return result;
815}
816
817/*
818 * Attempt to locate the file containing the module (name)
819 */
820static char *
821mod_searchmodule(char *name, struct mod_depend *verinfo)
822{
823 struct moduledir *mdp;
824 char *result;
825
826 moduledir_rebuild();
827 /*
828 * Now we ready to lookup module in the given directories
829 */
830 result = NULL;
831 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
832 result = mod_search_hints(mdp, name, verinfo);
833 if (result)
834 break;
835 }
836
837 return(result);
838}
839
840int
841file_addmodule(struct preloaded_file *fp, char *modname, int version,
842 struct kernel_module **newmp)
843{
844 struct kernel_module *mp;
845 struct mod_depend mdepend;
846
847 bzero(&mdepend, sizeof(mdepend));
848 mdepend.md_ver_preferred = version;
849 mp = file_findmodule(fp, modname, &mdepend);
850 if (mp)
851 return (EEXIST);
852 mp = malloc(sizeof(struct kernel_module));
853 if (mp == NULL)
854 return (ENOMEM);
855 bzero(mp, sizeof(struct kernel_module));
856 mp->m_name = strdup(modname);
857 mp->m_version = version;
858 mp->m_fp = fp;
859 mp->m_next = fp->f_modules;
860 fp->f_modules = mp;
861 if (newmp)
862 *newmp = mp;
863 return (0);
864}
865
866/*
867 * Throw a file away
868 */
869void
870file_discard(struct preloaded_file *fp)
871{
872 struct file_metadata *md, *md1;
873 struct kernel_module *mp, *mp1;
874 if (fp == NULL)
875 return;
876 md = fp->f_metadata;
877 while (md) {
878 md1 = md;
879 md = md->md_next;
880 free(md1);
881 }
882 mp = fp->f_modules;
883 while (mp) {
884 if (mp->m_name)
885 free(mp->m_name);
886 mp1 = mp;
887 mp = mp->m_next;
888 free(mp1);
889 }
890 if (fp->f_name != NULL)
891 free(fp->f_name);
892 if (fp->f_type != NULL)
893 free(fp->f_type);
894 if (fp->f_args != NULL)
895 free(fp->f_args);
896 free(fp);
897}
898
899/*
900 * Allocate a new file; must be used instead of malloc()
901 * to ensure safe initialisation.
902 */
903struct preloaded_file *
904file_alloc(void)
905{
906 struct preloaded_file *fp;
907
908 if ((fp = malloc(sizeof(struct preloaded_file))) != NULL) {
909 bzero(fp, sizeof(struct preloaded_file));
910 }
911 return (fp);
912}
913
914/*
915 * Add a module to the chain
916 */
917static void
918file_insert_tail(struct preloaded_file *fp)
919{
920 struct preloaded_file *cm;
921
922 /* Append to list of loaded file */
923 fp->f_next = NULL;
924 if (preloaded_files == NULL) {
925 preloaded_files = fp;
926 } else {
927 for (cm = preloaded_files; cm->f_next != NULL; cm = cm->f_next)
928 ;
929 cm->f_next = fp;
930 }
931}
932
933static char *
934moduledir_fullpath(struct moduledir *mdp, const char *fname)
935{
936 char *cp;
937
938 cp = malloc(strlen(mdp->d_path) + strlen(fname) + 2);
939 if (cp == NULL)
940 return NULL;
941 strcpy(cp, mdp->d_path);
942 strcat(cp, "/");
943 strcat(cp, fname);
944 return (cp);
945}
946
947/*
948 * Read linker.hints file into memory performing some sanity checks.
949 */
950static void
951moduledir_readhints(struct moduledir *mdp)
952{
953 struct stat st;
954 char *path;
955 int fd, size, version;
956
957 if (mdp->d_hints != NULL || (mdp->d_flags & MDIR_NOHINTS))
958 return;
959 path = moduledir_fullpath(mdp, "linker.hints");
960 if (stat(path, &st) != 0 ||
961 st.st_size < (ssize_t)(sizeof(version) + sizeof(int)) ||
962 st.st_size > LINKER_HINTS_MAX || (fd = open(path, O_RDONLY)) < 0) {
963 free(path);
964 mdp->d_flags |= MDIR_NOHINTS;
965 return;
966 }
967 free(path);
968 size = read(fd, &version, sizeof(version));
969 if (size != sizeof(version) || version != LINKER_HINTS_VERSION)
970 goto bad;
971 size = st.st_size - size;
972 mdp->d_hints = malloc(size);
973 if (mdp->d_hints == NULL)
974 goto bad;
975 if (read(fd, mdp->d_hints, size) != size)
976 goto bad;
977 mdp->d_hintsz = size;
978 close(fd);
979 return;
980bad:
981 close(fd);
982 if (mdp->d_hints) {
983 free(mdp->d_hints);
984 mdp->d_hints = NULL;
985 }
986 mdp->d_flags |= MDIR_NOHINTS;
987 return;
988}
989
990/*
991 * Extract directories from the ';' separated list, remove duplicates.
992 */
993static void
994moduledir_rebuild(void)
995{
996 struct moduledir *mdp, *mtmp;
997 const char *path, *cp, *ep;
998 size_t cplen;
999
1000 path = getenv("module_path");
1001 if (path == NULL)
1002 path = default_searchpath;
1003 /*
1004 * Rebuild list of module directories if it changed
1005 */
1006 STAILQ_FOREACH(mdp, &moduledir_list, d_link)
1007 mdp->d_flags |= MDIR_REMOVED;
1008
1009 for (ep = path; *ep != 0; ep++) {
1010 cp = ep;
1011 for (; *ep != 0 && *ep != ';'; ep++)
1012 ;
1013 /*
1014 * Ignore trailing slashes
1015 */
1016 for (cplen = ep - cp; cplen > 1 && cp[cplen - 1] == '/'; cplen--)
1017 ;
1018 STAILQ_FOREACH(mdp, &moduledir_list, d_link) {
1019 if (strlen(mdp->d_path) != cplen || bcmp(cp, mdp->d_path, cplen) != 0)
1020 continue;
1021 mdp->d_flags &= ~MDIR_REMOVED;
1022 break;
1023 }
1024 if (mdp == NULL) {
1025 mdp = malloc(sizeof(*mdp) + cplen + 1);
1026 if (mdp == NULL)
1027 return;
1028 mdp->d_path = (char*)(mdp + 1);
1029 bcopy(cp, mdp->d_path, cplen);
1030 mdp->d_path[cplen] = 0;
1031 mdp->d_hints = NULL;
1032 mdp->d_flags = 0;
1033 STAILQ_INSERT_TAIL(&moduledir_list, mdp, d_link);
1034 }
1035 if (*ep == 0)
1036 break;
1037 }
1038 /*
1039 * Delete unused directories if any
1040 */
1041 mdp = STAILQ_FIRST(&moduledir_list);
1042 while (mdp) {
1043 if ((mdp->d_flags & MDIR_REMOVED) == 0) {
1044 mdp = STAILQ_NEXT(mdp, d_link);
1045 } else {
1046 if (mdp->d_hints)
1047 free(mdp->d_hints);
1048 mtmp = mdp;
1049 mdp = STAILQ_NEXT(mdp, d_link);
1050 STAILQ_REMOVE(&moduledir_list, mtmp, moduledir, d_link);
1051 free(mtmp);
1052 }
1053 }
1054 return;
1055}
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