| |
| /** |
| * 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)); |
| }); |
| } |