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tests/node_modules/wireless-tools/udhcpd.js

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+/*
+ * Copyright (c) 2015 Christopher M. Baker
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+var child_process = require('child_process');
+
+/**
+ * The **udhcpd** command is used to configure a dhcp server for a
+ * network interface.
+ *
+ * @static
+ * @category udhcpd
+ *
+ */
+var udhcpd = module.exports = {
+  exec: child_process.exec,
+  disable: disable,
+  enable: enable
+};
+
+/**
+ * Recursively expand `options` into `lines` with a `prefix`.
+ *
+ * @private
+ * @static
+ * @category udhcpd
+ * @param {object} options The dhcp server configuration.
+ * @param {array} lines The lines of the configuration file.
+ * @param {array) prefix The key prefix.
+ *
+ */
+function expand_r(options, lines, prefix) {
+  Object.getOwnPropertyNames(options).forEach(function(key) {
+    var full = prefix.concat(key);
+    var value = options[key];
+
+    if (Array.isArray(value)) {
+      value.forEach(function(val) {
+        lines.push(full.concat(val).join(' '));
+      });      
+    }
+    else if (typeof(value) == 'object') {
+      expand_r(value, lines, full);
+    }
+    else {
+      lines.push(full.concat(value).join(' '));
+    }
+  });
+}
+
+/**
+ * Convert dhcp server configuration options to a configuration file.
+ *
+ * @private
+ * @static
+ * @category udhcpd
+ * @param {object} options The dhcp server configuration.
+ * @returns {array} The lines of the configuration file.
+ *
+ */
+function expand(options) {
+  var lines = [];
+  expand_r(options, lines, []);
+  return lines;
+}
+
+/**
+ * The **udhcpd enable** command is used to start a dhcp server on a
+ * specific network interface.
+ *
+ * @static
+ * @category udhcpd
+ * @param {object} options The dhcp server configuration.
+ * @param {function} callback The callback function.
+ * @returns {process} The child process.
+ * @example
+ *
+ * var udhcpd = require('wireless-tools/udhcpd');
+ *
+ * var options = {
+ *   interface: 'wlan0',
+ *   start: '192.168.10.100',
+ *   end: '192.168.10.200',
+ *   option: {
+ *     router: '192.168.10.1',
+ *     subnet: '255.255.255.0',
+ *     dns: [ '4.4.4.4', '8.8.8.8' ]
+ *   }
+ * };
+ *
+ * udhcpd.enable(options, function(err) {
+ *   // the dhcp server was started 
+ * });
+ *
+ */
+function enable(options, callback) {
+  var file = options.interface + '-udhcpd.conf';
+
+  var commands = [].concat(
+    'cat <<EOF >' + file + ' && udhcpd ' + file + ' && rm -f ' + file,
+    expand(options));
+
+  return this.exec(commands.join('\n'), callback);
+}
+
+/**
+ * The **udhcpd disable** command is used to stop a dhcp server on a
+ * specific network interface.
+ *
+ * @static
+ * @category udhcpd
+ * @param {string} interface The network interface.
+ * @param {function} callback The callback function.
+ * @returns {process} The child process.
+ * @example
+ *
+ * var udhcpd = require('wireless-tools/udhcpd');
+ *
+ * udhcpd.disable('wlan0', function(err) {
+ *   // the dhcp server was stopped 
+ * });
+ *
+ */
+function disable(interface, callback) {
+  var file = interface + '-udhcpd.conf';
+  return this.exec('kill `pgrep -f "^udhcpd ' + file + '"` || true', callback);
+}