mirror of
https://github.com/sheumann/hush.git
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215 lines
5.3 KiB
C
215 lines
5.3 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* depmod - generate modules.dep
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* Copyright (c) 2008 Bernhard Reutner-Fischer
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* Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi>
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* Copyright (c) 2008 Vladimir Dronnikov
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#undef _GNU_SOURCE
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#define _GNU_SOURCE
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#include <libbb.h>
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#include <sys/utsname.h> /* uname() */
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#include "modutils.h"
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/*
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* Theory of operation:
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* - iterate over all modules and record their full path
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* - iterate over all modules looking for "depends=" entries
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* for each depends, look through our list of full paths and emit if found
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*/
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typedef struct module_info {
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struct module_info *next;
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char *name, *modname;
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llist_t *dependencies;
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llist_t *aliases;
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llist_t *symbols;
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struct module_info *dnext, *dprev;
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} module_info;
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enum {
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ARG_a = (1<<0), /* All modules, ignore mods in argv */
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ARG_A = (1<<1), /* Only emit .ko that are newer than modules.dep file */
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ARG_b = (1<<2), /* not /lib/modules/$(uname -r)/ but this base-dir */
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ARG_e = (1<<3), /* with -F, print unresolved symbols */
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ARG_F = (1<<4), /* System.map that contains the symbols */
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ARG_n = (1<<5) /* dry-run, print to stdout only */
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};
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static int FAST_FUNC parse_module(const char *fname, struct stat *sb,
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void *data, int UNUSED_PARAM depth)
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{
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module_info **first = (module_info **) data;
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char *image, *ptr;
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module_info *info;
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size_t len = sb->st_size;
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if (strrstr(fname, ".ko") == NULL)
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return TRUE;
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image = (char *) xmalloc_open_zipped_read_close(fname, &len);
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info = xzalloc(sizeof(module_info));
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info->next = *first;
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*first = info;
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info->dnext = info->dprev = info;
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info->name = xstrdup(fname);
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info->modname = filename2modname(fname, NULL);
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for (ptr = image; ptr < image + len - 10; ptr++) {
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if (strncmp(ptr, "depends=", 8) == 0) {
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char *u;
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ptr += 8;
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for (u = ptr; *u; u++)
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if (*u == '-')
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*u = '_';
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ptr += string_to_llist(ptr, &info->dependencies, ",");
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} else if (ENABLE_FEATURE_MODUTILS_ALIAS &&
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strncmp(ptr, "alias=", 6) == 0) {
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llist_add_to(&info->aliases, xstrdup(ptr + 6));
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ptr += strlen(ptr);
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} else if (ENABLE_FEATURE_MODUTILS_SYMBOLS &&
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strncmp(ptr, "__ksymtab_", 10) == 0) {
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ptr += 10;
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if (strncmp(ptr, "gpl", 3) == 0 ||
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strcmp(ptr, "strings") == 0)
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continue;
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llist_add_to(&info->symbols, xstrdup(ptr));
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ptr += strlen(ptr);
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}
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}
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free(image);
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return TRUE;
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}
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static module_info *find_module(module_info *modules, const char *modname)
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{
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module_info *m;
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for (m = modules; m != NULL; m = m->next)
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if (strcmp(m->modname, modname) == 0)
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return m;
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return NULL;
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}
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static void order_dep_list(module_info *modules, module_info *start,
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llist_t *add)
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{
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module_info *m;
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llist_t *n;
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for (n = add; n != NULL; n = n->link) {
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m = find_module(modules, n->data);
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if (m == NULL)
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continue;
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/* unlink current entry */
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m->dnext->dprev = m->dprev;
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m->dprev->dnext = m->dnext;
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/* and add it to tail */
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m->dnext = start;
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m->dprev = start->dprev;
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start->dprev->dnext = m;
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start->dprev = m;
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/* recurse */
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order_dep_list(modules, start, m->dependencies);
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}
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}
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int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int depmod_main(int argc UNUSED_PARAM, char **argv)
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{
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module_info *modules = NULL, *m, *dep;
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char *moddir_base = (char *)CONFIG_DEFAULT_MODULES_DIR;
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int tmp;
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getopt32(argv, "aAb:eF:n", &moddir_base, NULL);
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argv += optind;
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/* goto modules location */
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/* If a version is provided, then that kernel version's module directory
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* is used, rather than the current kernel version (as returned by
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* "uname -r"). */
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xchdir(moddir_base);
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if (*argv && (sscanf(*argv, "%d.%d.%d", &tmp, &tmp, &tmp) == 3)) {
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xchdir(*argv++);
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} else {
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struct utsname uts;
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uname(&uts);
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xchdir(uts.release);
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}
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/* If no modules are given on the command-line, -a is on per default. */
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option_mask32 |= *argv == NULL;
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/* Scan modules */
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moddir_base = xrealloc_getcwd_or_warn(NULL);
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do {
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recursive_action((option_mask32 & ARG_a) ? moddir_base : *argv,
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ACTION_RECURSE, parse_module, NULL, &modules, 0);
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} while (!(option_mask32 & ARG_a) && *(++argv));
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if (ENABLE_FEATURE_CLEAN_UP)
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free(moddir_base);
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/* Generate dependency and alias files */
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if (!(option_mask32 & ARG_n))
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freopen(CONFIG_DEFAULT_DEPMOD_FILE, "w", stdout);
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for (m = modules; m != NULL; m = m->next) {
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printf("%s:", m->name);
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order_dep_list(modules, m, m->dependencies);
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while (m->dnext != m) {
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dep = m->dnext;
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printf(" %s", dep->name);
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/* unlink current entry */
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dep->dnext->dprev = dep->dprev;
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dep->dprev->dnext = dep->dnext;
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dep->dnext = dep->dprev = dep;
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}
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puts("");
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}
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#if ENABLE_FEATURE_MODUTILS_ALIAS
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if (!(option_mask32 & ARG_n))
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freopen("modules.alias", "w", stdout);
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for (m = modules; m != NULL; m = m->next) {
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while (m->aliases) {
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printf("alias %s %s\n",
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(char*)llist_pop(&m->aliases),
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m->modname);
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}
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}
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#endif
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#if ENABLE_FEATURE_MODUTILS_SYMBOLS
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if (!(option_mask32 & ARG_n))
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freopen("modules.symbols", "w", stdout);
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for (m = modules; m != NULL; m = m->next) {
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while (m->symbols) {
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printf("alias symbol:%s %s\n",
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(char*)llist_pop(&m->symbols),
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m->modname);
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}
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}
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#endif
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if (ENABLE_FEATURE_CLEAN_UP) {
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while (modules) {
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module_info *old = modules;
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modules = modules->next;
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free(old->name);
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free(old->modname);
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free(old);
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}
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}
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return EXIT_SUCCESS;
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}
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