diff options
| -rw-r--r-- | modutils/modprobe.c | 362 |
1 files changed, 217 insertions, 145 deletions
diff --git a/modutils/modprobe.c b/modutils/modprobe.c index 9454833..a5ade2a 100644 --- a/modutils/modprobe.c +++ b/modutils/modprobe.c @@ -13,26 +13,22 @@ #include <sys/utsname.h> #include <fnmatch.h> -struct modprobe_option { - char *module; - char *option; +#define MODULE_FLAG_LOADED 0x0001 +#define MODULE_FLAG_NEED_DEPS 0x0002 +//Misnomer? Seems to mean "was seen in modules.dep": +#define MODULE_FLAG_EXISTS 0x0004 +#define MODULE_FLAG_BLACKLISTED 0x0008 + +struct module_entry { /* I'll call it ME. */ + unsigned flags; + char *modname; /* stripped of /path/, .ext and s/-/_/g */ + const char *probed_name; /* verbatim as seen on cmdline */ + llist_t *aliases; /* strings. aliases from config files */ + llist_t *options; /* strings. options from config files */ + llist_t *deps; /* strings. modules we depend on */ }; -struct modprobe_conf { - char probename[MODULE_NAME_LEN]; - llist_t *options; - llist_t *aliases; -#if ENABLE_FEATURE_MODPROBE_BLACKLIST -#define add_to_blacklist(conf, name) llist_add_to(&conf->blacklist, name) -#define check_blacklist(conf, name) (llist_find(conf->blacklist, name) == NULL) - llist_t *blacklist; -#else -#define add_to_blacklist(conf, name) do {} while (0) -#define check_blacklist(conf, name) (1) -#endif -}; - -#define MODPROBE_OPTS "acdlnrt:VC:" USE_FEATURE_MODPROBE_BLACKLIST("b") +#define MODPROBE_OPTS "acdlnrt:VC:" USE_FEATURE_MODPROBE_BLACKLIST("b") enum { MODPROBE_OPT_INSERT_ALL = (INSMOD_OPT_UNUSED << 0), /* a */ MODPROBE_OPT_DUMP_ONLY = (INSMOD_OPT_UNUSED << 1), /* c */ @@ -46,30 +42,75 @@ enum { MODPROBE_OPT_BLACKLIST = (INSMOD_OPT_UNUSED << 9) * ENABLE_FEATURE_MODPROBE_BLACKLIST, }; -static llist_t *loaded; +struct globals { + llist_t *db; /* MEs of all modules ever seen (caching for speed) */ + llist_t *probes; /* MEs of module(s) requested on cmdline */ + llist_t *cmdline_mopts; /* strings. module options (from cmdline) */ + int num_deps; /* what is this? */ + /* bool. "Did we have 'symbol:FOO' requested on cmdline?" */ + smallint need_symbols; +}; +#define G (*(struct globals*)&bb_common_bufsiz1) +#define INIT_G() do { } while (0) -static int read_config(struct modprobe_conf *conf, const char *path); -static void add_option(llist_t **all_opts, const char *module, const char *opts) +static int read_config(const char *path); + +static struct module_entry *helper_get_module(const char *module, int create) { - struct modprobe_option *o; + char modname[MODULE_NAME_LEN]; + struct module_entry *e; + llist_t *l; + + filename2modname(module, modname); + for (l = G.db; l != NULL; l = l->link) { + e = (struct module_entry *) l->data; + if (strcmp(e->modname, modname) == 0) + return e; + } + if (!create) + return NULL; - o = xzalloc(sizeof(struct modprobe_option)); - if (module) - o->module = filename2modname(module, NULL); - o->option = xstrdup(opts); - llist_add_to(all_opts, o); + e = xzalloc(sizeof(*e)); + e->modname = xstrdup(modname); + llist_add_to(&G.db, e); + + return e; +} +static struct module_entry *get_or_add_modentry(const char *module) +{ + return helper_get_module(module, 1); +} +static struct module_entry *get_modentry(const char *module) +{ + return helper_get_module(module, 0); +} + +static void add_probe(const char *name) +{ + struct module_entry *m; + + m = get_or_add_modentry(name); + m->probed_name = name; + m->flags |= MODULE_FLAG_NEED_DEPS; + llist_add_to(&G.probes, m); + + G.num_deps++; + if (ENABLE_FEATURE_MODUTILS_SYMBOLS + && strncmp(m->modname, "symbol:", 7) == 0) + G.need_symbols = 1; } static int FAST_FUNC config_file_action(const char *filename, struct stat *statbuf UNUSED_PARAM, - void *userdata, + void *userdata UNUSED_PARAM, int depth UNUSED_PARAM) { - struct modprobe_conf *conf = (struct modprobe_conf *) userdata; RESERVE_CONFIG_BUFFER(modname, MODULE_NAME_LEN); - char *tokens[3]; + char *tokens[3], *rmod; parser_t *p; + llist_t *l; + struct module_entry *m; int rc = TRUE; if (bb_basename(filename)[0] == '.') @@ -82,20 +123,39 @@ static int FAST_FUNC config_file_action(const char *filename, } while (config_read(p, tokens, 3, 2, "# \t", PARSE_NORMAL)) { +//Use index_in_strings? if (strcmp(tokens[0], "alias") == 0) { filename2modname(tokens[1], modname); - if (tokens[2] && - fnmatch(modname, conf->probename, 0) == 0) - llist_add_to(&conf->aliases, - filename2modname(tokens[2], NULL)); + if (tokens[2] == NULL) + continue; + + for (l = G.probes; l != NULL; l = l->link) { + m = (struct module_entry *) l->data; + if (fnmatch(modname, m->modname, 0) != 0) + continue; + rmod = filename2modname(tokens[2], NULL); + llist_add_to(&m->aliases, rmod); + + if (m->flags & MODULE_FLAG_NEED_DEPS) { + m->flags &= ~MODULE_FLAG_NEED_DEPS; + G.num_deps--; + } + + m = get_or_add_modentry(rmod); + m->flags |= MODULE_FLAG_NEED_DEPS; + G.num_deps++; + } } else if (strcmp(tokens[0], "options") == 0) { - if (tokens[2]) - add_option(&conf->options, tokens[1], tokens[2]); + if (tokens[2] == NULL) + continue; + m = get_or_add_modentry(tokens[1]); + llist_add_to(&m->options, xstrdup(tokens[2])); } else if (strcmp(tokens[0], "include") == 0) { - read_config(conf, tokens[1]); - } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST && - strcmp(tokens[0], "blacklist") == 0) { - add_to_blacklist(conf, xstrdup(tokens[1])); + read_config(tokens[1]); + } else if (ENABLE_FEATURE_MODPROBE_BLACKLIST + && strcmp(tokens[0], "blacklist") == 0 + ) { + get_or_add_modentry(tokens[1])->flags |= MODULE_FLAG_BLACKLISTED; } } config_close(p); @@ -104,186 +164,198 @@ error: return rc; } -static int read_config(struct modprobe_conf *conf, const char *path) +static int read_config(const char *path) { return recursive_action(path, ACTION_RECURSE | ACTION_QUIET, - config_file_action, NULL, conf, 1); + config_file_action, NULL, NULL, 1); } -static char *gather_options(llist_t *first, const char *module, int usecmdline) +static char *gather_options(char *opts, llist_t *o) { - struct modprobe_option *opt; - llist_t *n; - char *opts = xstrdup(""); - int optlen = 0; + int optlen; - for (n = first; n != NULL; n = n->link) { - opt = (struct modprobe_option *) n->data; + if (opts == NULL) + opts = xstrdup(""); + optlen = strlen(opts); - if (opt->module == NULL && !usecmdline) - continue; - if (opt->module != NULL && strcmp(opt->module, module) != 0) - continue; - - opts = xrealloc(opts, optlen + strlen(opt->option) + 2); - optlen += sprintf(opts + optlen, "%s ", opt->option); + for (; o != NULL; o = o->link) { + opts = xrealloc(opts, optlen + strlen(o->data) + 2); + optlen += sprintf(opts + optlen, "%s ", o->data); } return opts; } -static int do_modprobe(struct modprobe_conf *conf, const char *module) +static int do_modprobe(struct module_entry *m) { - RESERVE_CONFIG_BUFFER(modname, MODULE_NAME_LEN); - llist_t *deps = NULL; - char *fn, *options, *colon = NULL, *tokens[2]; - parser_t *p; + struct module_entry *m2; + char *fn, *options; int rc = -1; - p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, fopen_for_read); - /* Modprobe does not work at all without modprobe.dep, - * even if the full module name is given. Returning error here - * was making us later confuse user with this message: - * "module /full/path/to/existing/file/module.ko not found". - * It's better to die immediately, with good message: */ - if (p == NULL) - bb_perror_msg_and_die("can't open '%s'", CONFIG_DEFAULT_DEPMOD_FILE); - - while (config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL)) { - colon = last_char_is(tokens[0], ':'); - if (colon == NULL) - continue; - - filename2modname(tokens[0], modname); - if (strcmp(modname, module) == 0) - break; - - colon = NULL; - } - if (colon == NULL) - goto error_not_found; - - colon[0] = '\0'; - llist_add_to(&deps, xstrdup(tokens[0])); - if (tokens[1]) - string_to_llist(tokens[1], &deps, " "); + if (!(m->flags & MODULE_FLAG_EXISTS)) + return -ENOENT; if (!(option_mask32 & MODPROBE_OPT_REMOVE)) - deps = llist_rev(deps); + m->deps = llist_rev(m->deps); rc = 0; - while (deps && rc == 0) { - fn = llist_pop(&deps); - filename2modname(fn, modname); + while (m->deps && rc == 0) { + fn = llist_pop(&m->deps); + m2 = get_or_add_modentry(fn); if (option_mask32 & MODPROBE_OPT_REMOVE) { - if (bb_delete_module(modname, O_EXCL) != 0) + if (bb_delete_module(m->modname, O_EXCL) != 0) rc = errno; - } else if (llist_find(loaded, modname) == NULL) { - options = gather_options(conf->options, modname, - strcmp(modname, module) == 0); + } else if (!(m2->flags & MODULE_FLAG_LOADED)) { + options = gather_options(NULL, m2->options); + if (m == m2) + options = gather_options(options, G.cmdline_mopts); +//TODO: looks like G.cmdline_mopts can contain either NULL or just one string, not more? rc = bb_init_module(fn, options); if (rc == 0) - llist_add_to(&loaded, xstrdup(modname)); + m2->flags |= MODULE_FLAG_LOADED; free(options); } free(fn); } - error_not_found: - config_close(p); - - if (rc > 0 && !(option_mask32 & INSMOD_OPT_SILENT)) + if (rc > 0 && !(option_mask32 & INSMOD_OPT_SILENT)) { bb_error_msg("failed to %sload module %s: %s", - (option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "", - module, moderror(rc)); + (option_mask32 & MODPROBE_OPT_REMOVE) ? "un" : "", + m->probed_name ? m->probed_name : m->modname, + moderror(rc) + ); + } - RELEASE_CONFIG_BUFFER(modname); return rc; } +static void load_modules_dep(void) +{ + struct module_entry *m; + char *colon, *tokens[2]; + parser_t *p; + + p = config_open2(CONFIG_DEFAULT_DEPMOD_FILE, xfopen_for_read); +//Still true? + /* Modprobe does not work at all without modprobe.dep, + * even if the full module name is given. Returning error here + * was making us later confuse user with this message: + * "module /full/path/to/existing/file/module.ko not found". + * It's better to die immediately, with good message: */ +// if (p == NULL) +// bb_perror_msg_and_die("can't open '%s'", CONFIG_DEFAULT_DEPMOD_FILE); + + while (G.num_deps + && config_read(p, tokens, 2, 1, "# \t", PARSE_NORMAL) + ) { + colon = last_char_is(tokens[0], ':'); + if (colon == NULL) + continue; + *colon = 0; + + m = get_modentry(tokens[0]); + if (m == NULL) + continue; +//Can we skip it too if it is MODULE_FLAG_LOADED? + + m->flags |= MODULE_FLAG_EXISTS; + if ((m->flags & MODULE_FLAG_NEED_DEPS) && (m->deps == NULL)) { + G.num_deps--; + llist_add_to(&m->deps, xstrdup(tokens[0])); + if (tokens[1]) + string_to_llist(tokens[1], &m->deps, " "); + } + } + config_close(p); +} + int modprobe_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int modprobe_main(int argc UNUSED_PARAM, char **argv) { struct utsname uts; int rc; unsigned opt; - llist_t *options = NULL; + struct module_entry *me; opt_complementary = "q-v:v-q"; - opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS, - NULL, NULL); + opt = getopt32(argv, INSMOD_OPTS MODPROBE_OPTS INSMOD_ARGS, NULL, NULL); argv += optind; if (opt & (MODPROBE_OPT_DUMP_ONLY | MODPROBE_OPT_LIST_ONLY | MODPROBE_OPT_SHOW_ONLY)) bb_error_msg_and_die("not supported"); - /* goto modules location */ + /* Goto modules location */ xchdir(CONFIG_DEFAULT_MODULES_DIR); uname(&uts); xchdir(uts.release); if (!argv[0]) { if (opt & MODPROBE_OPT_REMOVE) { + /* TODO: comment here */ if (bb_delete_module(NULL, O_NONBLOCK|O_EXCL) != 0) bb_perror_msg_and_die("rmmod"); } return EXIT_SUCCESS; } - if (!(opt & MODPROBE_OPT_INSERT_ALL)) { - /* If not -a, we have only one module name, - * the rest of parameters are options */ - add_option(&options, NULL, parse_cmdline_module_options(argv)); - argv[1] = NULL; + + if (opt & MODPROBE_OPT_INSERT_ALL) { + /* Each argument is a module name */ + do { + add_probe(*argv++); + } while (*argv); + G.probes = llist_rev(G.probes); + } else { + /* First argument is module name, rest are parameters */ + add_probe(argv[0]); +//TODO: looks like G.cmdline_mopts can contain either NULL or just one string, not more? +//optimize it them + llist_add_to(&G.cmdline_mopts, parse_cmdline_module_options(argv)); } - /* cache modules */ + /* Retrieve module names of already loaded modules */ { char *s; parser_t *parser = config_open2("/proc/modules", fopen_for_read); while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) - llist_add_to(&loaded, xstrdup(s)); + get_or_add_modentry(s)->flags |= MODULE_FLAG_LOADED; config_close(parser); } - while (*argv) { - const char *arg = *argv; - struct modprobe_conf *conf; - - conf = xzalloc(sizeof(*conf)); - conf->options = options; - filename2modname(arg, conf->probename); - read_config(conf, "/etc/modprobe.conf"); - read_config(conf, "/etc/modprobe.d"); - if (ENABLE_FEATURE_MODUTILS_SYMBOLS - && conf->aliases == NULL - && strncmp(arg, "symbol:", 7) == 0 - ) { - read_config(conf, "modules.symbols"); - } - - if (ENABLE_FEATURE_MODUTILS_ALIAS && conf->aliases == NULL) - read_config(conf, "modules.alias"); + read_config("/etc/modprobe.conf"); + read_config("/etc/modprobe.d"); + if (ENABLE_FEATURE_MODUTILS_SYMBOLS && G.need_symbols) + read_config("modules.symbols"); + load_modules_dep(); + if (ENABLE_FEATURE_MODUTILS_ALIAS && G.num_deps) { + read_config("modules.alias"); + load_modules_dep(); + } - if (conf->aliases == NULL) { + while ((me = llist_pop(&G.probes)) != NULL) { + if (me->aliases == NULL) { /* Try if module by literal name is found; literal - * names are blacklist only if '-b' is given. */ - if (!(opt & MODPROBE_OPT_BLACKLIST) || - check_blacklist(conf, conf->probename)) { - rc = do_modprobe(conf, conf->probename); + * names are blacklisted only if '-b' is given. */ + if (!(opt & MODPROBE_OPT_BLACKLIST) + || !(me->flags & MODULE_FLAG_BLACKLISTED) + ) { + rc = do_modprobe(me); if (rc < 0 && !(opt & INSMOD_OPT_SILENT)) - bb_error_msg("module %s not found", arg); + bb_error_msg("module %s not found", + me->probed_name); } } else { /* Probe all aliases */ - while (conf->aliases != NULL) { - char *realname = llist_pop(&conf->aliases); - if (check_blacklist(conf, realname)) - do_modprobe(conf, realname); + do { + char *realname = llist_pop(&me->aliases); + struct module_entry *m2; + + m2 = get_or_add_modentry(realname); + if (!(m2->flags & MODULE_FLAG_BLACKLISTED)) + do_modprobe(m2); free(realname); - } + } while (me->aliases != NULL); } - argv++; } return EXIT_SUCCESS; |