src/modules-load.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2010 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU General Public License as published by
  10   the Free Software Foundation; either version 2 of the License, or
  11   (at your option) any later version.
  12
  13   systemd is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include <unistd.h>
  23 #include <fcntl.h>
  24 #include <errno.h>
  25 #include <string.h>
  26 #include <sys/stat.h>
  27 #include <limits.h>
  28 #include <dirent.h>
  29 #include <libkmod.h>
  30
  31 #include "log.h"
  32 #include "util.h"
  33 #include "strv.h"
  34
  35 #pragma GCC diagnostic push
  36 #pragma GCC diagnostic ignored "-Wformat-nonliteral"
  37 static void systemd_kmod_log(void *data, int priority, const char *file, int line,
  38                              const char *fn, const char *format, va_list args)
  39 {
  40         log_meta(priority, file, line, fn, format, args);
  41 }
  42 #pragma GCC diagnostic pop
  43
  44 int main(int argc, char *argv[]) {
  45         int r = EXIT_FAILURE;
  46         char **files, **fn;
  47         struct kmod_ctx *ctx;
  48         const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST|KMOD_PROBE_IGNORE_LOADED;
  49
  50         if (argc > 1) {
  51                 log_error("This program takes no argument.");
  52                 return EXIT_FAILURE;
  53         }
  54
  55         log_set_target(LOG_TARGET_AUTO);
  56         log_parse_environment();
  57         log_open();
  58
  59         umask(0022);
  60
  61         ctx = kmod_new(NULL, NULL);
  62         if (!ctx) {
  63                 log_error("Failed to allocate memory for kmod.");
  64                 goto finish;
  65         }
  66
  67         kmod_load_resources(ctx);
  68
  69         kmod_set_log_fn(ctx, systemd_kmod_log, NULL);
  70
  71         if (conf_files_list(&files, ".conf",
  72                             "/etc/modules-load.d",
  73                             "/run/modules-load.d",
  74                             "/usr/local/lib/modules-load.d",
  75                             "/usr/lib/modules-load.d",
  76 #ifdef HAVE_SPLIT_USR
  77                             "/lib/modules-load.d",
  78 #endif
  79                             NULL) < 0) {
  80                 log_error("Failed to enumerate modules-load.d files: %s", strerror(-r));
  81                 goto finish;
  82         }
  83
  84         r = EXIT_SUCCESS;
  85
  86         STRV_FOREACH(fn, files) {
  87                 FILE *f;
  88
  89                 f = fopen(*fn, "re");
  90                 if (!f) {
  91                         if (errno == ENOENT)
  92                                 continue;
  93
  94                         log_error("Failed to open %s: %m", *fn);
  95                         r = EXIT_FAILURE;
  96                         continue;
  97                 }
  98
  99                 log_debug("apply: %s\n", *fn);
 100                 for (;;) {
 101                         char line[LINE_MAX], *l;
 102                         struct kmod_list *itr, *modlist = NULL;
 103                         int err;
 104
 105                         if (!fgets(line, sizeof(line), f))
 106                                 break;
 107
 108                         l = strstrip(line);
 109                         if (*l == '#' || *l == 0)
 110                                 continue;
 111
 112                         err = kmod_module_new_from_lookup(ctx, l, &modlist);
 113                         if (err < 0) {
 114                                 log_error("Failed to lookup alias '%s'", l);
 115                                 r = EXIT_FAILURE;
 116                                 continue;
 117                         }
 118
 119                         kmod_list_foreach(itr, modlist) {
 120                                 struct kmod_module *mod;
 121
 122                                 mod = kmod_module_get_module(itr);
 123                                 err = kmod_module_probe_insert_module(mod, probe_flags,
 124                                                                       NULL, NULL, NULL, NULL);
 125
 126                                 if (err == 0)
 127                                         log_info("Inserted module '%s'", kmod_module_get_name(mod));
 128                                 else if (err == KMOD_PROBE_APPLY_BLACKLIST)
 129                                         log_info("Module '%s' is blacklisted", kmod_module_get_name(mod));
 130                                 else {
 131                                         log_error("Failed to insert '%s': %s", kmod_module_get_name(mod),
 132                                                         strerror(-err));
 133                                         r = EXIT_FAILURE;
 134                                 }
 135
 136                                 kmod_module_unref(mod);
 137                         }
 138
 139                         kmod_module_unref_list(modlist);
 140                 }
 141
 142                 if (ferror(f)) {
 143                         log_error("Failed to read from file: %m");
 144                         r = EXIT_FAILURE;
 145                 }
 146
 147                 fclose(f);
 148         }
 149
 150 finish:
 151         strv_free(files);
 152         kmod_unref(ctx);
 153
 154         return r;
 155 }