src/rfkill/rfkill.c

   1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
   2
   3 /***
   4   This file is part of systemd.
   5
   6   Copyright 2013 Lennart Poettering
   7
   8   systemd is free software; you can redistribute it and/or modify it
   9   under the terms of the GNU Lesser General Public License as published by
  10   the Free Software Foundation; either version 2.1 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   Lesser General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  20 ***/
  21
  22 #include "util.h"
  23 #include "mkdir.h"
  24 #include "fileio.h"
  25 #include "libudev.h"
  26 #include "udev-util.h"
  27
  28 int main(int argc, char *argv[]) {
  29         _cleanup_udev_unref_ struct udev *udev = NULL;
  30         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
  31         _cleanup_free_ char *saved = NULL, *escaped_name = NULL, *escaped_path_id = NULL;
  32         const char *name, *path_id;
  33         int r;
  34
  35         if (argc != 3) {
  36                 log_error("This program requires two arguments.");
  37                 return EXIT_FAILURE;
  38         }
  39
  40         log_set_target(LOG_TARGET_AUTO);
  41         log_parse_environment();
  42         log_open();
  43
  44         umask(0022);
  45
  46         r = mkdir_p("/var/lib/systemd/rfkill", 0755);
  47         if (r < 0) {
  48                 log_error_errno(-r, "Failed to create rfkill directory: %m");
  49                 return EXIT_FAILURE;
  50         }
  51
  52         udev = udev_new();
  53         if (!udev) {
  54                 log_oom();
  55                 return EXIT_FAILURE;
  56         }
  57
  58         errno = 0;
  59         device = udev_device_new_from_subsystem_sysname(udev, "rfkill", argv[2]);
  60         if (!device) {
  61                 if (errno != 0)
  62                         log_error("Failed to get rfkill device '%s': %m", argv[2]);
  63                 else
  64                         log_oom();
  65
  66                 return EXIT_FAILURE;
  67         }
  68
  69         name = udev_device_get_sysattr_value(device, "name");
  70         if (!name) {
  71                 log_error("rfkill device has no name?");
  72                 return EXIT_FAILURE;
  73         }
  74
  75         escaped_name = cescape(name);
  76         if (!escaped_name) {
  77                 log_oom();
  78                 return EXIT_FAILURE;
  79         }
  80
  81         path_id = udev_device_get_property_value(device, "ID_PATH");
  82         if (path_id) {
  83                 escaped_path_id = cescape(path_id);
  84                 if (!escaped_path_id) {
  85                         log_oom();
  86                         return EXIT_FAILURE;
  87                 }
  88
  89                 saved = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", escaped_name, NULL);
  90         } else
  91                 saved = strjoin("/var/lib/systemd/rfkill/", escaped_name, NULL);
  92
  93         if (!saved) {
  94                 log_oom();
  95                 return EXIT_FAILURE;
  96         }
  97
  98         if (streq(argv[1], "load")) {
  99                 _cleanup_free_ char *value = NULL;
 100
 101                 if (!shall_restore_state())
 102                         return EXIT_SUCCESS;
 103
 104                 r = read_one_line_file(saved, &value);
 105                 if (r < 0) {
 106
 107                         if (r == -ENOENT)
 108                                 return EXIT_SUCCESS;
 109
 110                         log_error_errno(-r, "Failed to read %s: %m", saved);
 111                         return EXIT_FAILURE;
 112                 }
 113
 114                 r = udev_device_set_sysattr_value(device, "soft", value);
 115                 if (r < 0) {
 116                         log_error_errno(-r, "Failed to write system attribute: %m");
 117                         return EXIT_FAILURE;
 118                 }
 119
 120         } else if (streq(argv[1], "save")) {
 121                 const char *value;
 122
 123                 value = udev_device_get_sysattr_value(device, "soft");
 124                 if (!value) {
 125                         log_error_errno(-r, "Failed to read system attribute: %m");
 126                         return EXIT_FAILURE;
 127                 }
 128
 129                 r = write_string_file(saved, value);
 130                 if (r < 0) {
 131                         log_error_errno(-r, "Failed to write %s: %m", saved);
 132                         return EXIT_FAILURE;
 133                 }
 134
 135         } else {
 136                 log_error("Unknown verb %s.", argv[1]);
 137                 return EXIT_FAILURE;
 138         }
 139
 140         return EXIT_SUCCESS;
 141 }