288 lines
8.3 KiB
C
288 lines
8.3 KiB
C
/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <getopt.h>
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#include <libkmod.h>
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#include <limits.h>
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#include <string.h>
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#include <sys/stat.h>
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#include "conf-files.h"
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#include "def.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "log.h"
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#include "proc-cmdline.h"
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#include "string-util.h"
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#include "strv.h"
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#include "util.h"
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static char **arg_proc_cmdline_modules = NULL;
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static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d");
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static void systemd_kmod_log(void *data, int priority, const char *file, int line,
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const char *fn, const char *format, va_list args) {
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DISABLE_WARNING_FORMAT_NONLITERAL;
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log_internalv(priority, 0, file, line, fn, format, args);
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REENABLE_WARNING;
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}
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static int add_modules(const char *p) {
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_cleanup_strv_free_ char **k = NULL;
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k = strv_split(p, ",");
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if (!k)
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return log_oom();
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if (strv_extend_strv(&arg_proc_cmdline_modules, k, true) < 0)
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return log_oom();
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return 0;
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}
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static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
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int r;
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if (proc_cmdline_key_streq(key, "modules_load")) {
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if (proc_cmdline_value_missing(key, value))
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return 0;
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r = add_modules(value);
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if (r < 0)
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return r;
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}
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return 0;
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}
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static int load_module(struct kmod_ctx *ctx, const char *m) {
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const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
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struct kmod_list *itr, *modlist = NULL;
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int r = 0;
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log_debug("load: %s", m);
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r = kmod_module_new_from_lookup(ctx, m, &modlist);
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if (r < 0)
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return log_error_errno(r, "Failed to lookup alias '%s': %m", m);
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if (!modlist) {
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log_error("Failed to find module '%s'", m);
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return -ENOENT;
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}
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kmod_list_foreach(itr, modlist) {
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struct kmod_module *mod;
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int state, err;
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mod = kmod_module_get_module(itr);
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state = kmod_module_get_initstate(mod);
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switch (state) {
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case KMOD_MODULE_BUILTIN:
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log_info("Module '%s' is builtin", kmod_module_get_name(mod));
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break;
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case KMOD_MODULE_LIVE:
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log_debug("Module '%s' is already loaded", kmod_module_get_name(mod));
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break;
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default:
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err = kmod_module_probe_insert_module(mod, probe_flags,
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NULL, NULL, NULL, NULL);
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if (err == 0)
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log_info("Inserted module '%s'", kmod_module_get_name(mod));
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else if (err == KMOD_PROBE_APPLY_BLACKLIST)
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log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
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else {
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log_error_errno(err, "Failed to insert '%s': %m", kmod_module_get_name(mod));
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r = err;
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}
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}
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kmod_module_unref(mod);
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}
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kmod_module_unref_list(modlist);
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return r;
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}
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static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent) {
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_cleanup_fclose_ FILE *f = NULL;
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int r;
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assert(ctx);
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assert(path);
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r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
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if (r < 0) {
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if (ignore_enoent && r == -ENOENT)
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return 0;
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return log_error_errno(r, "Failed to open %s, ignoring: %m", path);
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}
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log_debug("apply: %s", path);
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for (;;) {
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char line[LINE_MAX], *l;
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int k;
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if (!fgets(line, sizeof(line), f)) {
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if (feof(f))
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break;
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return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
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}
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l = strstrip(line);
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if (!*l)
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continue;
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if (strchr(COMMENTS "\n", *l))
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continue;
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k = load_module(ctx, l);
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if (k < 0 && r == 0)
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r = k;
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}
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return r;
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}
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static void help(void) {
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printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
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"Loads statically configured kernel modules.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n",
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program_invocation_short_name);
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_VERSION = 0x100,
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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help();
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return 0;
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case ARG_VERSION:
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return version();
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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return 1;
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}
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int main(int argc, char *argv[]) {
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int r, k;
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struct kmod_ctx *ctx;
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r = parse_argv(argc, argv);
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if (r <= 0)
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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log_set_target(LOG_TARGET_AUTO);
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log_parse_environment();
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log_open();
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umask(0022);
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r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
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if (r < 0)
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log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
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ctx = kmod_new(NULL, NULL);
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if (!ctx) {
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log_error("Failed to allocate memory for kmod.");
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goto finish;
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}
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kmod_load_resources(ctx);
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kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
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r = 0;
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if (argc > optind) {
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int i;
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for (i = optind; i < argc; i++) {
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k = apply_file(ctx, argv[i], false);
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if (k < 0 && r == 0)
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r = k;
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}
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} else {
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_cleanup_strv_free_ char **files = NULL;
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char **fn, **i;
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STRV_FOREACH(i, arg_proc_cmdline_modules) {
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k = load_module(ctx, *i);
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if (k < 0 && r == 0)
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r = k;
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}
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k = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs);
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if (k < 0) {
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log_error_errno(k, "Failed to enumerate modules-load.d files: %m");
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if (r == 0)
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r = k;
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goto finish;
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}
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STRV_FOREACH(fn, files) {
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k = apply_file(ctx, *fn, true);
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if (k < 0 && r == 0)
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r = k;
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}
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}
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finish:
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kmod_unref(ctx);
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strv_free(arg_proc_cmdline_modules);
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return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
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}
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