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 #include "util.h"
  28
  29 int main(int argc, char *argv[]) {
  30         _cleanup_udev_unref_ struct udev *udev = NULL;
  31         _cleanup_udev_device_unref_ struct udev_device *device = NULL;
  32         _cleanup_free_ char *saved = NULL, *escaped_name = NULL, *escaped_path_id = NULL;
  33         const char *name, *path_id;
  34         int r;
  35
  36         if (argc != 3) {
  37                 log_error("This program requires two arguments.");
  38                 return EXIT_FAILURE;
  39         }
  40
  41         log_set_target(LOG_TARGET_AUTO);
  42         log_parse_environment();
  43         log_open();
  44
  45         umask(0022);
  46
  47         r = mkdir_p("/var/lib/systemd/rfkill", 0755);
  48         if (r < 0) {
  49                 log_error("Failed to create rfkill directory: %s", strerror(-r));
  50                 return EXIT_FAILURE;
  51         }
  52
  53         udev = udev_new();
  54         if (!udev) {
  55                 log_oom();
  56                 return EXIT_FAILURE;
  57         }
  58
  59         errno = 0;
  60         device = udev_device_new_from_subsystem_sysname(udev, "rfkill", argv[2]);
  61         if (!device) {
  62                 if (errno != 0)
  63                         log_error("Failed to get rfkill device '%s': %m", argv[2]);
  64                 else
  65                         log_oom();
  66
  67                 return EXIT_FAILURE;
  68         }
  69
  70         name = udev_device_get_sysattr_value(device, "name");
  71         if (!name) {
  72                 log_error("rfkill device has no name?");
  73                 return EXIT_FAILURE;
  74         }
  75
  76         escaped_name = cescape(name);
  77         if (!escaped_name) {
  78                 log_oom();
  79                 return EXIT_FAILURE;
  80         }
  81
  82         path_id = udev_device_get_property_value(device, "ID_PATH");
  83         if (path_id) {
  84                 escaped_path_id = cescape(path_id);
  85                 if (!escaped_path_id) {
  86                         log_oom();
  87                         return EXIT_FAILURE;
  88                 }
  89
  90                 saved = strjoin("/var/lib/systemd/rfkill/", escaped_path_id, ":", escaped_name, NULL);
  91         } else
  92                 saved = strjoin("/var/lib/systemd/rfkill/", escaped_name, NULL);
  93
  94         if (!saved) {
  95                 log_oom();
  96                 return EXIT_FAILURE;
  97         }
  98
  99         if (streq(argv[1], "load") && restore_state()) {
 100                 _cleanup_free_ char *value = NULL;
 101
 102                 r = read_one_line_file(saved, &value);
 103                 if (r < 0) {
 104
 105                         if (r == -ENOENT)
 106                                 return EXIT_SUCCESS;
 107
 108                         log_error("Failed to read %s: %s", saved, strerror(-r));
 109                         return EXIT_FAILURE;
 110                 }
 111
 112                 r = udev_device_set_sysattr_value(device, "soft", value);
 113                 if (r < 0) {
 114                         log_error("Failed to write system attribute: %s", strerror(-r));
 115                         return EXIT_FAILURE;
 116                 }
 117
 118         } else if (streq(argv[1], "save")) {
 119                 const char *value;
 120
 121                 value = udev_device_get_sysattr_value(device, "soft");
 122                 if (!value) {
 123                         log_error("Failed to read system attribute: %s", strerror(-r));
 124                         return EXIT_FAILURE;
 125                 }
 126
 127                 r = write_string_file(saved, value);
 128                 if (r < 0) {
 129                         log_error("Failed to write %s: %s", saved, strerror(-r));
 130                         return EXIT_FAILURE;
 131                 }
 132
 133         } else {
 134                 log_error("Unknown verb %s.", argv[1]);
 135                 return EXIT_FAILURE;
 136         }
 137
 138         return EXIT_SUCCESS;
 139 }