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_type = NULL, *escaped_path_id = NULL;
  32         const char *name, *type, *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         device = udev_device_new_from_subsystem_sysname(udev, "rfkill", argv[2]);
  59         if (!device) {
  60                 log_debug_errno(errno, "Failed to get rfkill device '%s', ignoring: %m", argv[2]);
  61                 return EXIT_SUCCESS;
  62         }
  63
  64         name = udev_device_get_sysattr_value(device, "name");
  65         if (!name) {
  66                 log_error("rfkill device has no name? Ignoring device.");
  67                 return EXIT_SUCCESS;
  68         }
  69
  70         log_debug("Operating on rfkill device '%s'.", name);
  71
  72         type = udev_device_get_sysattr_value(device, "type");
  73         if (!type) {
  74                 log_error("rfkill device has no type? Ignoring device.");
  75                 return EXIT_SUCCESS;
  76         }
  77
  78         escaped_type = cescape(type);
  79         if (!escaped_type) {
  80                 log_oom();
  81                 return EXIT_FAILURE;
  82         }
  83
  84         path_id = udev_device_get_property_value(device, "ID_PATH");
  85         if (path_id) {
  86                 escaped_path_id = cescape(path_id);
  87                 if (!escaped_path_id) {
  88                         log_oom();
  89                         return EXIT_FAILURE;
  90                 }
  91
  92                 saved = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", escaped_type, NULL);
  93         } else
  94                 saved = strjoin("/var/lib/systemd/rfkill/", escaped_type, NULL);
  95
  96         if (!saved) {
  97                 log_oom();
  98                 return EXIT_FAILURE;
  99         }
 100
 101         if (streq(argv[1], "load")) {
 102                 _cleanup_free_ char *value = NULL;
 103
 104                 if (!shall_restore_state())
 105                         return EXIT_SUCCESS;
 106
 107                 r = read_one_line_file(saved, &value);
 108                 if (r == -ENOENT)
 109                         return EXIT_SUCCESS;
 110                 if (r < 0) {
 111                         log_error_errno(r, "Failed to read %s: %m", saved);
 112                         return EXIT_FAILURE;
 113                 }
 114
 115                 r = udev_device_set_sysattr_value(device, "soft", value);
 116                 if (r < 0) {
 117                         log_debug_errno(r, "Failed to write 'soft' attribute on rfkill device, ignoring: %m");
 118                         return EXIT_SUCCESS;
 119                 }
 120
 121         } else if (streq(argv[1], "save")) {
 122                 const char *value;
 123
 124                 value = udev_device_get_sysattr_value(device, "soft");
 125                 if (!value) {
 126                         log_debug_errno(r, "Failed to read system attribute, ignoring device: %m");
 127                         return EXIT_SUCCESS;
 128                 }
 129
 130                 r = write_string_file(saved, value);
 131                 if (r < 0) {
 132                         log_error_errno(r, "Failed to write %s: %m", saved);
 133                         return EXIT_FAILURE;
 134                 }
 135
 136         } else {
 137                 log_error("Unknown verb %s.", argv[1]);
 138                 return EXIT_FAILURE;
 139         }
 140
 141         return EXIT_SUCCESS;
 142 }