missed a file

lib/iptables/check.js

@@ -0,0 +1,66 @@
+var exec = require('child_process').exec;
+
+var tables = require('./utils').tables;
+var processCommonRuleSpecs = require('./utils').processCommonRuleSpecs;
+
+
+/**
+ * Checks the existence one or more rules from the selected chain.
+ *
+ * @param options
+ * @param cb
+ */
+module.exports = function (options, cb) {
+  if (typeof arguments[0] != 'object') {
+    throw new Error('Invalid arguments. Signature: (options, callback?)');
+  }
+
+  var table = (typeof options.table != 'undefined')
+    ? options.table
+    : tables.filter;
+
+  var ipt_cmd = (options.sudo)
+    ? 'sudo '
+    : '';
+
+  ipt_cmd += (options.ipv6)
+    ? 'ip6tables'
+    : 'iptables';
+
+  /*
+   * Build cmd to execute.
+   */
+  var cmd = [ipt_cmd, '--table', table, '--check'];
+  var args = [];
+
+  /*
+   * Process options.
+   */
+  if (typeof options.chain != 'undefined') {
+    args = args.concat(options.chain);
+  }
+
+  if (typeof options.rulenum != 'undefined') {
+    args = args.concat(options.rulenum);
+  }
+  else {
+    var common_rule_specs = processCommonRuleSpecs(options);
+    args = args.concat(common_rule_specs);
+  }
+
+  /*
+   * Execute command.
+   */
+  exec(cmd.concat(args).join(' '), function (error, stdout, stderror) {
+    if (error && cb) {
+      var err = new Error(stderror.split('\n')[0]);
+      err.cmd = cmd.concat(args).join(' ');
+      err.code = error.code;
+
+      cb(err);
+    }
+    else if (cb) {
+      cb(null);
+    }
+  });
+};