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
  30 #include "log.h"
  31 #include "util.h"
  32 #include "strv.h"
  33
  34 int main(int argc, char *argv[]) {
  35         int r = EXIT_FAILURE;
  36         char **arguments = NULL;
  37         unsigned n_arguments = 0, n_allocated = 0;
  38         char **files, **fn;
  39
  40         if (argc > 1) {
  41                 log_error("This program takes no argument.");
  42                 return EXIT_FAILURE;
  43         }
  44
  45         log_set_target(LOG_TARGET_SYSLOG_OR_KMSG);
  46         log_parse_environment();
  47         log_open();
  48
  49         if (!(arguments = strv_new("/sbin/modprobe", "-sab", "--", NULL))) {
  50                 log_error("Failed to allocate string array");
  51                 goto finish;
  52         }
  53
  54         n_arguments = n_allocated = 3;
  55
  56         files = conf_files_list(".conf",
  57                                 "/run/modules-load.d",
  58                                 "/etc/modules-load.d",
  59                                 "/usr/lib/modules-load.d",
  60                                 NULL);
  61         if (files == NULL) {
  62                 log_error("Failed to enumerate modules-load.d files: %m");
  63                 goto finish;
  64         }
  65
  66         r = EXIT_SUCCESS;
  67
  68         STRV_FOREACH(fn, files) {
  69                 FILE *f;
  70
  71                 f = fopen(*fn, "re");
  72                 if (!f) {
  73                         if (errno == ENOENT)
  74                                 continue;
  75
  76                         log_error("Failed to open %s: %m", *fn);
  77                         free(fn);
  78                         r = EXIT_FAILURE;
  79                         continue;
  80                 }
  81
  82                 log_debug("apply: %s\n", *fn);
  83                 for (;;) {
  84                         char line[LINE_MAX], *l, *t;
  85
  86                         if (!(fgets(line, sizeof(line), f)))
  87                                 break;
  88
  89                         l = strstrip(line);
  90                         if (*l == '#' || *l == 0)
  91                                 continue;
  92
  93                         if (!(t = strdup(l))) {
  94                                 log_error("Failed to allocate module name.");
  95                                 continue;
  96                         }
  97
  98                         if (n_arguments >= n_allocated) {
  99                                 char **a;
 100                                 unsigned m;
 101
 102                                 m = MAX(16U, n_arguments*2);
 103
 104                                 if (!(a = realloc(arguments, sizeof(char*) * (m+1)))) {
 105                                         log_error("Failed to increase module array size.");
 106                                         free(t);
 107                                         r = EXIT_FAILURE;
 108                                         continue;
 109                                 }
 110
 111                                 arguments = a;
 112                                 n_allocated = m;
 113                         }
 114
 115                         arguments[n_arguments++] = t;
 116                 }
 117
 118                 if (ferror(f)) {
 119                         r = EXIT_FAILURE;
 120                         log_error("Failed to read from file: %m");
 121                 }
 122
 123                 fclose(f);
 124         }
 125
 126         strv_free(files);
 127 finish:
 128
 129         if (n_arguments > 3) {
 130                 arguments[n_arguments] = NULL;
 131                 execv("/sbin/modprobe", arguments);
 132
 133                 log_error("Failed to execute /sbin/modprobe: %m");
 134                 r = EXIT_FAILURE;
 135         }
 136
 137         strv_free(arguments);
 138
 139         return r;
 140 }