291 lines
7.6 KiB
C
291 lines
7.6 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 source tree.
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*/
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//applet:IF_DEPMOD(APPLET(depmod, BB_DIR_SBIN, BB_SUID_DROP))
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#include "libbb.h"
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#include "modutils.h"
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#include <sys/utsname.h> /* uname() */
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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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static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM,
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void *data, int depth UNUSED_PARAM)
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{
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char modname[MODULE_NAME_LEN];
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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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/* Arbitrary. Was sb->st_size, but that breaks .gz etc */
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size_t len = (64*1024*1024 - 4096);
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if (strrstr(fname, ".ko") == NULL)
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return TRUE;
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image = xmalloc_open_zipped_read_close(fname, &len);
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info = xzalloc(sizeof(*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 + 2); /* skip "./" */
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info->modname = xstrdup(
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filename2modname(
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bb_get_last_path_component_nostrip(fname),
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modname
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));
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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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) {
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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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) {
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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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) {
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continue;
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}
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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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static void xfreopen_write(const char *file, FILE *f)
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{
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if (freopen(file, "w", f) == NULL)
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bb_perror_msg_and_die("can't open '%s'", file);
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}
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//usage:#if !ENABLE_MODPROBE_SMALL
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//usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..."
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//usage:#define depmod_full_usage "\n\n"
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//usage: "Generate modules.dep, alias, and symbols files"
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//usage: "\n"
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//usage: "\n -b BASE Use BASE/lib/modules/VERSION"
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//usage: "\n -n Dry run: print files to stdout"
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//usage:#endif
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/* Upstream usage:
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* [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]...
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* -a --all
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* Probe all modules. Default if no MODFILES.
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* -A --quick
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* Check modules.dep's mtime against module files' mtimes.
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* -b --basedir BASE
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* Use $BASE/lib/modules/VERSION
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* -C --config FILE or DIR
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* Path to /etc/depmod.conf or /etc/depmod.d/
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* -e --errsyms
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* When combined with the -F option, this reports any symbols
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* which are not supplied by other modules or kernel.
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* -F --filesyms System.map
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* -n --dry-run
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* Print modules.dep etc to standard output
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* -v --verbose
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* Print to stdout all the symbols each module depends on
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* and the module's file name which provides that symbol.
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* -r No-op
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* -u No-op
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* -q No-op
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*
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* So far we only support: [-n] [-b BASE] [VERSION] [MODFILES]...
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* Accepted but ignored:
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* -aAe
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* -F System.map
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* -C FILE/DIR
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*
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* Not accepted: -v
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*/
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enum {
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//OPT_a = (1 << 0), /* All modules, ignore mods in argv */
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//OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */
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OPT_b = (1 << 2), /* base directory when modules are in staging area */
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//OPT_e = (1 << 3), /* with -F, print unresolved symbols */
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//OPT_F = (1 << 4), /* System.map that contains the symbols */
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OPT_n = (1 << 5), /* dry-run, print to stdout only */
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OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */
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OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */
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OPT_q = (1 << 8), /* -q,--quiet: ignored */
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OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */
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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, *m, *dep;
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const char *moddir_base = "/";
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char *moddir, *version;
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struct utsname uts;
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int tmp;
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getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL);
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argv += optind;
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/* goto modules location */
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xchdir(moddir_base);
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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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if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) {
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version = *argv++;
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} else {
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uname(&uts);
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version = uts.release;
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}
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moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version);
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xchdir(moddir);
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if (ENABLE_FEATURE_CLEAN_UP)
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free(moddir);
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/* Scan modules */
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modules = NULL;
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if (*argv) {
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do {
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parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0);
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} while (*++argv);
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} else {
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recursive_action(".", ACTION_RECURSE,
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parse_module, NULL, &modules, 0);
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}
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/* Generate dependency and alias files */
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if (!(option_mask32 & OPT_n))
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xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, 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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bb_putchar('\n');
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}
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#if ENABLE_FEATURE_MODUTILS_ALIAS
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if (!(option_mask32 & OPT_n))
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xfreopen_write("modules.alias", stdout);
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for (m = modules; m != NULL; m = m->next) {
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char modname[MODULE_NAME_LEN];
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const char *fname = bb_basename(m->name);
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filename2modname(fname, modname);
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while (m->aliases) {
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/* Last word can well be m->modname instead,
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* but depmod from module-init-tools 3.4
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* uses module basename, i.e., no s/-/_/g.
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* (pathname and .ko.* are still stripped)
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* Mimicking that... */
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printf("alias %s %s\n",
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(char*)llist_pop(&m->aliases),
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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 & OPT_n))
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xfreopen_write("modules.symbols", stdout);
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for (m = modules; m != NULL; m = m->next) {
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char modname[MODULE_NAME_LEN];
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const char *fname = bb_basename(m->name);
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filename2modname(fname, modname);
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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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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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