diff options
Diffstat (limited to 'src/grp-initprogs/systemd-modules-load/modules-load.c')
| -rw-r--r-- | src/grp-initprogs/systemd-modules-load/modules-load.c | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/src/grp-initprogs/systemd-modules-load/modules-load.c b/src/grp-initprogs/systemd-modules-load/modules-load.c new file mode 100644 index 0000000000..13f6ac529d --- /dev/null +++ b/src/grp-initprogs/systemd-modules-load/modules-load.c @@ -0,0 +1,283 @@ +/*** + This file is part of systemd. + + Copyright 2010 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <errno.h> +#include <getopt.h> +#include <libkmod.h> +#include <limits.h> +#include <string.h> +#include <sys/stat.h> + +#include "systemd-basic/conf-files.h" +#include "systemd-basic/def.h" +#include "systemd-basic/fd-util.h" +#include "systemd-basic/fileio.h" +#include "systemd-basic/log.h" +#include "systemd-basic/proc-cmdline.h" +#include "systemd-basic/string-util.h" +#include "systemd-basic/strv.h" +#include "systemd-basic/util.h" + +static char **arg_proc_cmdline_modules = NULL; + +static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d"); + +static void systemd_kmod_log(void *data, int priority, const char *file, int line, + const char *fn, const char *format, va_list args) { + + DISABLE_WARNING_FORMAT_NONLITERAL; + log_internalv(priority, 0, file, line, fn, format, args); + REENABLE_WARNING; +} + +static int add_modules(const char *p) { + _cleanup_strv_free_ char **k = NULL; + + k = strv_split(p, ","); + if (!k) + return log_oom(); + + if (strv_extend_strv(&arg_proc_cmdline_modules, k, true) < 0) + return log_oom(); + + return 0; +} + +static int parse_proc_cmdline_item(const char *key, const char *value) { + int r; + + if (STR_IN_SET(key, "modules-load", "rd.modules-load") && value) { + r = add_modules(value); + if (r < 0) + return r; + } + + return 0; +} + +static int load_module(struct kmod_ctx *ctx, const char *m) { + const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST; + struct kmod_list *itr, *modlist = NULL; + int r = 0; + + log_debug("load: %s", m); + + r = kmod_module_new_from_lookup(ctx, m, &modlist); + if (r < 0) + return log_error_errno(r, "Failed to lookup alias '%s': %m", m); + + if (!modlist) { + log_error("Failed to find module '%s'", m); + return -ENOENT; + } + + kmod_list_foreach(itr, modlist) { + struct kmod_module *mod; + int state, err; + + mod = kmod_module_get_module(itr); + state = kmod_module_get_initstate(mod); + + switch (state) { + case KMOD_MODULE_BUILTIN: + log_info("Module '%s' is builtin", kmod_module_get_name(mod)); + break; + + case KMOD_MODULE_LIVE: + log_debug("Module '%s' is already loaded", kmod_module_get_name(mod)); + break; + + default: + err = kmod_module_probe_insert_module(mod, probe_flags, + NULL, NULL, NULL, NULL); + + if (err == 0) + log_info("Inserted module '%s'", kmod_module_get_name(mod)); + else if (err == KMOD_PROBE_APPLY_BLACKLIST) + log_info("Module '%s' is blacklisted", kmod_module_get_name(mod)); + else { + log_error_errno(err, "Failed to insert '%s': %m", kmod_module_get_name(mod)); + r = err; + } + } + + kmod_module_unref(mod); + } + + kmod_module_unref_list(modlist); + + return r; +} + +static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent) { + _cleanup_fclose_ FILE *f = NULL; + int r; + + assert(ctx); + assert(path); + + r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f); + if (r < 0) { + if (ignore_enoent && r == -ENOENT) + return 0; + + return log_error_errno(r, "Failed to open %s, ignoring: %m", path); + } + + log_debug("apply: %s", path); + for (;;) { + char line[LINE_MAX], *l; + int k; + + if (!fgets(line, sizeof(line), f)) { + if (feof(f)) + break; + + return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path); + } + + l = strstrip(line); + if (!*l) + continue; + if (strchr(COMMENTS "\n", *l)) + continue; + + k = load_module(ctx, l); + if (k < 0 && r == 0) + r = k; + } + + return r; +} + +static void help(void) { + printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n" + "Loads statically configured kernel modules.\n\n" + " -h --help Show this help\n" + " --version Show package version\n", + program_invocation_short_name); +} + +static int parse_argv(int argc, char *argv[]) { + + enum { + ARG_VERSION = 0x100, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + {} + }; + + int c; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) + + switch (c) { + + case 'h': + help(); + return 0; + + case ARG_VERSION: + return version(); + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + return 1; +} + +int main(int argc, char *argv[]) { + int r, k; + struct kmod_ctx *ctx; + + r = parse_argv(argc, argv); + if (r <= 0) + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; + + log_set_target(LOG_TARGET_AUTO); + log_parse_environment(); + log_open(); + + umask(0022); + + r = parse_proc_cmdline(parse_proc_cmdline_item); + if (r < 0) + log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m"); + + ctx = kmod_new(NULL, NULL); + if (!ctx) { + log_error("Failed to allocate memory for kmod."); + goto finish; + } + + kmod_load_resources(ctx); + kmod_set_log_fn(ctx, systemd_kmod_log, NULL); + + r = 0; + + if (argc > optind) { + int i; + + for (i = optind; i < argc; i++) { + k = apply_file(ctx, argv[i], false); + if (k < 0 && r == 0) + r = k; + } + + } else { + _cleanup_strv_free_ char **files = NULL; + char **fn, **i; + + STRV_FOREACH(i, arg_proc_cmdline_modules) { + k = load_module(ctx, *i); + if (k < 0 && r == 0) + r = k; + } + + k = conf_files_list_nulstr(&files, ".conf", NULL, conf_file_dirs); + if (k < 0) { + log_error_errno(k, "Failed to enumerate modules-load.d files: %m"); + if (r == 0) + r = k; + goto finish; + } + + STRV_FOREACH(fn, files) { + k = apply_file(ctx, *fn, true); + if (k < 0 && r == 0) + r = k; + } + } + +finish: + kmod_unref(ctx); + strv_free(arg_proc_cmdline_modules); + + return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS; +} |