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-
- /**
- * Module dependencies.
- */
-
- var dns = require('dns');
- var Netmask = require('netmask').Netmask;
-
- /**
- * Module exports.
- */
-
- module.exports = isInNet;
-
- isInNet.async = true;
-
- /**
- * True iff the IP address of the host matches the specified IP address pattern.
- *
- * Pattern and mask specification is done the same way as for SOCKS configuration.
- *
- * Examples:
- *
- * ``` js
- * isInNet(host, "198.95.249.79", "255.255.255.255")
- * // is true iff the IP address of host matches exactly 198.95.249.79.
- *
- * isInNet(host, "198.95.0.0", "255.255.0.0")
- * // is true iff the IP address of the host matches 198.95.*.*.
- * ```
- *
- * @param {String} host a DNS hostname, or IP address. If a hostname is passed,
- * it will be resoved into an IP address by this function.
- * @param {String} pattern an IP address pattern in the dot-separated format mask.
- * @param {String} mask for the IP address pattern informing which parts of the
- * IP address should be matched against. 0 means ignore, 255 means match.
- * @return {Boolean}
- */
-
- function isInNet (host, pattern, mask, fn) {
- var family = 4;
- dns.lookup(host, family, function (err, ip) {
- if (err) return fn(err);
- if (!ip) ip = '127.0.0.1';
- var netmask = new Netmask(pattern, mask);
- fn(null, netmask.contains(ip));
- });
- }
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