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