src/modules-load/modules-load.c

   1 /***
   2   This file is part of systemd.
   3
   4   Copyright 2010 Lennart Poettering
   5
   6   systemd is free software; you can redistribute it and/or modify it
   7   under the terms of the GNU Lesser General Public License as published by
   8   the Free Software Foundation; either version 2.1 of the License, or
   9   (at your option) any later version.
  10
  11   systemd is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   Lesser General Public License for more details.
  15
  16   You should have received a copy of the GNU Lesser General Public License
  17   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  18 ***/
  19
  20 #include <errno.h>
  21 #include <getopt.h>
  22 #include <libkmod.h>
  23 #include <limits.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26
  27 #include "conf-files.h"
  28 #include "def.h"
  29 #include "fd-util.h"
  30 #include "fileio.h"
  31 #include "log.h"
  32 #include "module-util.h"
  33 #include "proc-cmdline.h"
  34 #include "string-util.h"
  35 #include "strv.h"
  36 #include "util.h"
  37
  38 static char **arg_proc_cmdline_modules = NULL;
  39
  40 static const char conf_file_dirs[] = CONF_PATHS_NULSTR("modules-load.d");
  41
  42 static void systemd_kmod_log(void *data, int priority, const char *file, int line,
  43                              const char *fn, const char *format, va_list args) {
  44
  45         DISABLE_WARNING_FORMAT_NONLITERAL;
  46         log_internalv(priority, 0, file, line, fn, format, args);
  47         REENABLE_WARNING;
  48 }
  49
  50 static int add_modules(const char *p) {
  51         _cleanup_strv_free_ char **k = NULL;
  52
  53         k = strv_split(p, ",");
  54         if (!k)
  55                 return log_oom();
  56
  57         if (strv_extend_strv(&arg_proc_cmdline_modules, k, true) < 0)
  58                 return log_oom();
  59
  60         return 0;
  61 }
  62
  63 static int parse_proc_cmdline_item(const char *key, const char *value, void *data) {
  64         int r;
  65
  66         if (proc_cmdline_key_streq(key, "modules_load")) {
  67
  68                 if (proc_cmdline_value_missing(key, value))
  69                         return 0;
  70
  71                 r = add_modules(value);
  72                 if (r < 0)
  73                         return r;
  74         }
  75
  76         return 0;
  77 }
  78
  79 static int load_module(struct kmod_ctx *ctx, const char *m) {
  80         const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
  81         struct kmod_list *itr;
  82         _cleanup_(kmod_module_unref_listp) struct kmod_list *modlist = NULL;
  83         int r = 0;
  84
  85         log_debug("load: %s", m);
  86
  87         r = kmod_module_new_from_lookup(ctx, m, &modlist);
  88         if (r < 0)
  89                 return log_error_errno(r, "Failed to lookup alias '%s': %m", m);
  90
  91         if (!modlist) {
  92                 log_error("Failed to find module '%s'", m);
  93                 return -ENOENT;
  94         }
  95
  96         kmod_list_foreach(itr, modlist) {
  97                 _cleanup_(kmod_module_unrefp) struct kmod_module *mod = NULL;
  98                 int state, err;
  99
 100                 mod = kmod_module_get_module(itr);
 101                 state = kmod_module_get_initstate(mod);
 102
 103                 switch (state) {
 104                 case KMOD_MODULE_BUILTIN:
 105                         log_info("Module '%s' is builtin", kmod_module_get_name(mod));
 106                         break;
 107
 108                 case KMOD_MODULE_LIVE:
 109                         log_debug("Module '%s' is already loaded", kmod_module_get_name(mod));
 110                         break;
 111
 112                 default:
 113                         err = kmod_module_probe_insert_module(mod, probe_flags,
 114                                                               NULL, NULL, NULL, NULL);
 115
 116                         if (err == 0)
 117                                 log_info("Inserted module '%s'", kmod_module_get_name(mod));
 118                         else if (err == KMOD_PROBE_APPLY_BLACKLIST)
 119                                 log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
 120                         else {
 121                                 assert(err < 0);
 122                                 r = log_error_errno(err, "Failed to insert '%s': %m",
 123                                                     kmod_module_get_name(mod));
 124                         }
 125                 }
 126         }
 127
 128         return r;
 129 }
 130
 131 static int apply_file(struct kmod_ctx *ctx, const char *path, bool ignore_enoent) {
 132         _cleanup_fclose_ FILE *f = NULL;
 133         int r;
 134
 135         assert(ctx);
 136         assert(path);
 137
 138         r = search_and_fopen_nulstr(path, "re", NULL, conf_file_dirs, &f);
 139         if (r < 0) {
 140                 if (ignore_enoent && r == -ENOENT)
 141                         return 0;
 142
 143                 return log_error_errno(r, "Failed to open %s, ignoring: %m", path);
 144         }
 145
 146         log_debug("apply: %s", path);
 147         for (;;) {
 148                 char line[LINE_MAX], *l;
 149                 int k;
 150
 151                 if (!fgets(line, sizeof(line), f)) {
 152                         if (feof(f))
 153                                 break;
 154
 155                         return log_error_errno(errno, "Failed to read file '%s', ignoring: %m", path);
 156                 }
 157
 158                 l = strstrip(line);
 159                 if (!*l)
 160                         continue;
 161                 if (strchr(COMMENTS "\n", *l))
 162                         continue;
 163
 164                 k = load_module(ctx, l);
 165                 if (k < 0 && r == 0)
 166                         r = k;
 167         }
 168
 169         return r;
 170 }
 171
 172 static void help(void) {
 173         printf("%s [OPTIONS...] [CONFIGURATION FILE...]\n\n"
 174                "Loads statically configured kernel modules.\n\n"
 175                "  -h --help             Show this help\n"
 176                "     --version          Show package version\n",
 177                program_invocation_short_name);
 178 }
 179
 180 static int parse_argv(int argc, char *argv[]) {
 181
 182         enum {
 183                 ARG_VERSION = 0x100,
 184         };
 185
 186         static const struct option options[] = {
 187                 { "help",      no_argument,       NULL, 'h'           },
 188                 { "version",   no_argument,       NULL, ARG_VERSION   },
 189                 {}
 190         };
 191
 192         int c;
 193
 194         assert(argc >= 0);
 195         assert(argv);
 196
 197         while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
 198
 199                 switch (c) {
 200
 201                 case 'h':
 202                         help();
 203                         return 0;
 204
 205                 case ARG_VERSION:
 206                         return version();
 207
 208                 case '?':
 209                         return -EINVAL;
 210
 211                 default:
 212                         assert_not_reached("Unhandled option");
 213                 }
 214
 215         return 1;
 216 }
 217
 218 int main(int argc, char *argv[]) {
 219         int r, k;
 220         _cleanup_(kmod_unrefp) struct kmod_ctx *ctx = NULL;
 221
 222         r = parse_argv(argc, argv);
 223         if (r <= 0)
 224                 return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 225
 226         log_set_target(LOG_TARGET_AUTO);
 227         log_parse_environment();
 228         log_open();
 229
 230         umask(0022);
 231
 232         r = proc_cmdline_parse(parse_proc_cmdline_item, NULL, PROC_CMDLINE_STRIP_RD_PREFIX);
 233         if (r < 0)
 234                 log_warning_errno(r, "Failed to parse kernel command line, ignoring: %m");
 235
 236         ctx = kmod_new(NULL, NULL);
 237         if (!ctx) {
 238                 log_error("Failed to allocate memory for kmod.");
 239                 goto finish;
 240         }
 241
 242         kmod_load_resources(ctx);
 243         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
 244
 245         r = 0;
 246
 247         if (argc > optind) {
 248                 int i;
 249
 250                 for (i = optind; i < argc; i++) {
 251                         k = apply_file(ctx, argv[i], false);
 252                         if (k < 0 && r == 0)
 253                                 r = k;
 254                 }
 255
 256         } else {
 257                 _cleanup_strv_free_ char **files = NULL;
 258                 char **fn, **i;
 259
 260                 STRV_FOREACH(i, arg_proc_cmdline_modules) {
 261                         k = load_module(ctx, *i);
 262                         if (k < 0 && r == 0)
 263                                 r = k;
 264                 }
 265
 266                 k = conf_files_list_nulstr(&files, ".conf", NULL, 0, conf_file_dirs);
 267                 if (k < 0) {
 268                         log_error_errno(k, "Failed to enumerate modules-load.d files: %m");
 269                         if (r == 0)
 270                                 r = k;
 271                         goto finish;
 272                 }
 273
 274                 STRV_FOREACH(fn, files) {
 275                         k = apply_file(ctx, *fn, true);
 276                         if (k < 0 && r == 0)
 277                                 r = k;
 278                 }
 279         }
 280
 281 finish:
 282         strv_free(arg_proc_cmdline_modules);
 283
 284         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 285 }