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("Failed to create rfkill directory: %s", strerror(-r));
  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") && restore_state()) {
  99                 _cleanup_free_ char *value = NULL;
 100
 101                 r = read_one_line_file(saved, &value);
 102                 if (r < 0) {
 103
 104                         if (r == -ENOENT)
 105                                 return EXIT_SUCCESS;
 106
 107                         log_error("Failed to read %s: %s", saved, strerror(-r));
 108                         return EXIT_FAILURE;
 109                 }
 110
 111                 r = udev_device_set_sysattr_value(device, "soft", value);
 112                 if (r < 0) {
 113                         log_error("Failed to write system attribute: %s", strerror(-r));
 114                         return EXIT_FAILURE;
 115                 }
 116
 117         } else if (streq(argv[1], "save")) {
 118                 const char *value;
 119
 120                 value = udev_device_get_sysattr_value(device, "soft");
 121                 if (!value) {
 122                         log_error("Failed to read system attribute: %s", strerror(-r));
 123                         return EXIT_FAILURE;
 124                 }
 125
 126                 r = write_string_file(saved, value);
 127                 if (r < 0) {
 128                         log_error("Failed to write %s: %s", saved, strerror(-r));
 129                         return EXIT_FAILURE;
 130                 }
 131
 132         } else {
 133                 log_error("Unknown verb %s.", argv[1]);
 134                 return EXIT_FAILURE;
 135         }
 136
 137         return EXIT_SUCCESS;
 138 }