@achingbrain/nat-port-mapper
Version:
Port mapping with UPnP and NAT-PMP
95 lines • 3.38 kB
JavaScript
import { isIPv4, isIPv6 } from '@chainsafe/is-ip';
import { Netmask } from 'netmask';
const PRIVATE_IP_RANGES = [
'0.0.0.0/8',
'10.0.0.0/8',
'100.64.0.0/10',
'127.0.0.0/8',
'169.254.0.0/16',
'172.16.0.0/12',
'192.0.0.0/24',
'192.0.0.0/29',
'192.0.0.8/32',
'192.0.0.9/32',
'192.0.0.10/32',
'192.0.0.170/32',
'192.0.0.171/32',
'192.0.2.0/24',
'192.31.196.0/24',
'192.52.193.0/24',
'192.88.99.0/24',
'192.168.0.0/16',
'192.175.48.0/24',
'198.18.0.0/15',
'198.51.100.0/24',
'203.0.113.0/24',
'240.0.0.0/4',
'255.255.255.255/32'
];
const NETMASK_RANGES = PRIVATE_IP_RANGES.map(ipRange => new Netmask(ipRange));
function ipv4Check(ipAddr) {
for (const r of NETMASK_RANGES) {
if (r.contains(ipAddr)) {
return true;
}
}
return false;
}
function isIpv4MappedIpv6(ipAddr) {
return /^::ffff:([0-9a-fA-F]{1,4}):([0-9a-fA-F]{1,4})$/.test(ipAddr);
}
/**
* @see https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.5.2
*/
function ipv4MappedIpv6Check(ipAddr) {
const parts = ipAddr.split(':');
if (parts.length < 2) {
return false;
}
const octet34 = parts[parts.length - 1].padStart(4, '0');
const octet12 = parts[parts.length - 2].padStart(4, '0');
const ip4 = `${parseInt(octet12.substring(0, 2), 16)}.${parseInt(octet12.substring(2), 16)}.${parseInt(octet34.substring(0, 2), 16)}.${parseInt(octet34.substring(2), 16)}`;
return ipv4Check(ip4);
}
/**
* @see https://datatracker.ietf.org/doc/html/rfc4291#section-2.2 example 3
*/
function isIpv4EmbeddedIpv6(ipAddr) {
return /^::ffff:([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/.test(ipAddr);
}
function ipv4EmbeddedIpv6Check(ipAddr) {
const parts = ipAddr.split(':');
const ip4 = parts[parts.length - 1];
return ipv4Check(ip4);
}
function ipv6Check(ipAddr) {
return /^::$/.test(ipAddr) ||
/^::1$/.test(ipAddr) ||
/^64:ff9b::([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/.test(ipAddr) ||
/^100::([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4})$/.test(ipAddr) ||
/^2001::([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4})$/.test(ipAddr) ||
/^2001:2[0-9a-fA-F]:([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4})$/.test(ipAddr) ||
/^2001:db8:([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4})$/.test(ipAddr) ||
/^2002:([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4}):?([0-9a-fA-F]{0,4})$/.test(ipAddr) ||
/^f[c-d]([0-9a-fA-F]{2,2}):/i.test(ipAddr) ||
/^fe[8-9a-bA-B][0-9a-fA-F]:/i.test(ipAddr) ||
/^ff([0-9a-fA-F]{2,2}):/i.test(ipAddr);
}
export function isPrivateIp(ip) {
if (isIPv4(ip)) {
return ipv4Check(ip);
}
else if (isIpv4MappedIpv6(ip)) {
return ipv4MappedIpv6Check(ip);
}
else if (isIpv4EmbeddedIpv6(ip)) {
return ipv4EmbeddedIpv6Check(ip);
}
else if (isIPv6(ip)) {
return ipv6Check(ip);
}
else {
return undefined;
}
}
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