| /* vi: set sw=4 ts=4: */ |
| /* |
| * depmod - generate modules.dep |
| * Copyright (c) 2008 Bernhard Reutner-Fischer |
| * Copyrihgt (c) 2008 Timo Teras <timo.teras@iki.fi> |
| * Copyright (c) 2008 Vladimir Dronnikov |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| //config:config DEPMOD |
| //config: bool "depmod" |
| //config: default n |
| //config: depends on !MODPROBE_SMALL |
| //config: select PLATFORM_LINUX |
| //config: help |
| //config: depmod generates modules.dep (and potentially modules.alias |
| //config: and modules.symbols) that contain dependency information |
| //config: for modprobe. |
| |
| //applet:IF_DEPMOD(APPLET(depmod, BB_DIR_SBIN, BB_SUID_DROP)) |
| |
| //kbuild:lib-$(CONFIG_DEPMOD) += depmod.o modutils.o |
| |
| #include "libbb.h" |
| #include "modutils.h" |
| #include <sys/utsname.h> /* uname() */ |
| |
| /* |
| * Theory of operation: |
| * - iterate over all modules and record their full path |
| * - iterate over all modules looking for "depends=" entries |
| * for each depends, look through our list of full paths and emit if found |
| */ |
| |
| static int FAST_FUNC parse_module(const char *fname, struct stat *sb UNUSED_PARAM, |
| void *data, int depth UNUSED_PARAM) |
| { |
| module_db *modules = data; |
| char *image, *ptr; |
| module_entry *e; |
| |
| /* Arbitrary. Was sb->st_size, but that breaks .gz etc */ |
| size_t len = (64*1024*1024 - 4096); |
| |
| if (strrstr(fname, ".ko") == NULL) |
| return TRUE; |
| |
| image = xmalloc_open_zipped_read_close(fname, &len); |
| |
| e = moddb_get_or_create(modules, bb_get_last_path_component_nostrip(fname)); |
| e->name = xstrdup(fname + 2); /* skip "./" */ |
| |
| for (ptr = image; ptr < image + len - 10; ptr++) { |
| if (is_prefixed_with(ptr, "depends=")) { |
| char *u; |
| |
| ptr += 8; |
| for (u = ptr; *u; u++) |
| if (*u == '-') |
| *u = '_'; |
| ptr += string_to_llist(ptr, &e->deps, ","); |
| } else if (ENABLE_FEATURE_MODUTILS_ALIAS |
| && is_prefixed_with(ptr, "alias=") |
| ) { |
| llist_add_to(&e->aliases, xstrdup(ptr + 6)); |
| ptr += strlen(ptr); |
| } else if (ENABLE_FEATURE_MODUTILS_SYMBOLS |
| && is_prefixed_with(ptr, "__ksymtab_") |
| ) { |
| ptr += 10; |
| if (is_prefixed_with(ptr, "gpl") |
| || strcmp(ptr, "strings") == 0 |
| ) { |
| continue; |
| } |
| llist_add_to(&e->symbols, xstrdup(ptr)); |
| ptr += strlen(ptr); |
| } |
| } |
| free(image); |
| |
| return TRUE; |
| } |
| |
| static void order_dep_list(module_db *modules, module_entry *start, llist_t *add) |
| { |
| module_entry *m; |
| llist_t *n; |
| |
| for (n = add; n != NULL; n = n->link) { |
| m = moddb_get(modules, n->data); |
| if (m == NULL) |
| continue; |
| |
| /* unlink current entry */ |
| m->dnext->dprev = m->dprev; |
| m->dprev->dnext = m->dnext; |
| |
| /* and add it to tail */ |
| m->dnext = start; |
| m->dprev = start->dprev; |
| start->dprev->dnext = m; |
| start->dprev = m; |
| |
| /* recurse */ |
| order_dep_list(modules, start, m->deps); |
| } |
| } |
| |
| static void xfreopen_write(const char *file, FILE *f) |
| { |
| if (freopen(file, "w", f) == NULL) |
| bb_perror_msg_and_die("can't open '%s'", file); |
| } |
| |
| //usage:#if !ENABLE_MODPROBE_SMALL |
| //usage:#define depmod_trivial_usage "[-n] [-b BASE] [VERSION] [MODFILES]..." |
| //usage:#define depmod_full_usage "\n\n" |
| //usage: "Generate modules.dep, alias, and symbols files" |
| //usage: "\n" |
| //usage: "\n -b BASE Use BASE/lib/modules/VERSION" |
| //usage: "\n -n Dry run: print files to stdout" |
| //usage:#endif |
| |
| /* Upstream usage: |
| * [-aAenv] [-C FILE or DIR] [-b BASE] [-F System.map] [VERSION] [MODFILES]... |
| * -a --all |
| * Probe all modules. Default if no MODFILES. |
| * -A --quick |
| * Check modules.dep's mtime against module files' mtimes. |
| * -b --basedir BASE |
| * Use $BASE/lib/modules/VERSION |
| * -C --config FILE or DIR |
| * Path to /etc/depmod.conf or /etc/depmod.d/ |
| * -e --errsyms |
| * When combined with the -F option, this reports any symbols |
| * which are not supplied by other modules or kernel. |
| * -F --filesyms System.map |
| * -n --dry-run |
| * Print modules.dep etc to standard output |
| * -v --verbose |
| * Print to stdout all the symbols each module depends on |
| * and the module's file name which provides that symbol. |
| * -r No-op |
| * -u No-op |
| * -q No-op |
| * |
| * So far we only support: [-n] [-b BASE] [VERSION] [MODFILES]... |
| * Accepted but ignored: |
| * -aAe |
| * -F System.map |
| * -C FILE/DIR |
| * |
| * Not accepted: -v |
| */ |
| enum { |
| //OPT_a = (1 << 0), /* All modules, ignore mods in argv */ |
| //OPT_A = (1 << 1), /* Only emit .ko that are newer than modules.dep file */ |
| OPT_b = (1 << 2), /* base directory when modules are in staging area */ |
| //OPT_e = (1 << 3), /* with -F, print unresolved symbols */ |
| //OPT_F = (1 << 4), /* System.map that contains the symbols */ |
| OPT_n = (1 << 5), /* dry-run, print to stdout only */ |
| OPT_r = (1 << 6), /* Compat dummy. Linux Makefile uses it */ |
| OPT_u = (1 << 7), /* -u,--unresolved-error: ignored */ |
| OPT_q = (1 << 8), /* -q,--quiet: ignored */ |
| OPT_C = (1 << 9), /* -C,--config etc_modules_conf: ignored */ |
| }; |
| |
| int depmod_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int depmod_main(int argc UNUSED_PARAM, char **argv) |
| { |
| module_db modules; |
| module_entry *m, *dep; |
| const char *moddir_base = "/"; |
| char *moddir, *version; |
| struct utsname uts; |
| unsigned i; |
| int tmp; |
| |
| getopt32(argv, "aAb:eF:nruqC:", &moddir_base, NULL, NULL); |
| argv += optind; |
| |
| /* goto modules location */ |
| xchdir(moddir_base); |
| |
| /* If a version is provided, then that kernel version's module directory |
| * is used, rather than the current kernel version (as returned by |
| * "uname -r"). */ |
| if (*argv && sscanf(*argv, "%u.%u.%u", &tmp, &tmp, &tmp) == 3) { |
| version = *argv++; |
| } else { |
| uname(&uts); |
| version = uts.release; |
| } |
| moddir = concat_path_file(&CONFIG_DEFAULT_MODULES_DIR[1], version); |
| xchdir(moddir); |
| if (ENABLE_FEATURE_CLEAN_UP) |
| free(moddir); |
| |
| /* Scan modules */ |
| memset(&modules, 0, sizeof(modules)); |
| if (*argv) { |
| do { |
| parse_module(*argv, /*sb (unused):*/ NULL, &modules, 0); |
| } while (*++argv); |
| } else { |
| recursive_action(".", ACTION_RECURSE, |
| parse_module, NULL, &modules, 0); |
| } |
| |
| /* Generate dependency and alias files */ |
| if (!(option_mask32 & OPT_n)) |
| xfreopen_write(CONFIG_DEFAULT_DEPMOD_FILE, stdout); |
| |
| moddb_foreach_module(&modules, m, i) { |
| printf("%s:", m->name); |
| |
| order_dep_list(&modules, m, m->deps); |
| while (m->dnext != m) { |
| dep = m->dnext; |
| printf(" %s", dep->name); |
| |
| /* unlink current entry */ |
| dep->dnext->dprev = dep->dprev; |
| dep->dprev->dnext = dep->dnext; |
| dep->dnext = dep->dprev = dep; |
| } |
| bb_putchar('\n'); |
| } |
| |
| #if ENABLE_FEATURE_MODUTILS_ALIAS |
| if (!(option_mask32 & OPT_n)) |
| xfreopen_write("modules.alias", stdout); |
| moddb_foreach_module(&modules, m, i) { |
| while (m->aliases) { |
| /* |
| * Last word used to be a basename |
| * (filename with path and .ko.* stripped) |
| * at the time of module-init-tools 3.4. |
| * kmod v.12 uses module name, i.e., s/-/_/g. |
| */ |
| printf("alias %s %s\n", |
| (char*)llist_pop(&m->aliases), |
| m->modname); |
| } |
| } |
| #endif |
| #if ENABLE_FEATURE_MODUTILS_SYMBOLS |
| if (!(option_mask32 & OPT_n)) |
| xfreopen_write("modules.symbols", stdout); |
| moddb_foreach_module(&modules, m, i) { |
| while (m->symbols) { |
| printf("alias symbol:%s %s\n", |
| (char*)llist_pop(&m->symbols), |
| m->modname); |
| } |
| } |
| #endif |
| |
| if (ENABLE_FEATURE_CLEAN_UP) |
| moddb_free(&modules); |
| |
| return EXIT_SUCCESS; |
| } |