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