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ip.js
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const ip = exports; const { Buffer } = require('buffer'); const os = require('os'); ip.toBuffer = function (ip, buff, offset) { offset = ~~offset; let result; if (this.isV4Format(ip)) { result = buff || Buffer.alloc(offset + 4); ip.split(/\./g).map((byte) => { result[offset++] = parseInt(byte, 10) & 0xff; }); } else if (this.isV6Format(ip)) { const sections = ip.split(':', 8); let i; for (i = 0; i < sections.length; i++) { const isv4 = this.isV4Format(sections[i]); let v4Buffer; if (isv4) { v4Buffer = this.toBuffer(sections[i]); sections[i] = v4Buffer.slice(0, 2).toString('hex'); } if (v4Buffer && ++i < 8) { sections.splice(i, 0, v4Buffer.slice(2, 4).toString('hex')); } } if (sections[0] === '') { while (sections.length < 8) sections.unshift('0'); } else if (sections[sections.length - 1] === '') { while (sections.length < 8) sections.push('0'); } else if (sections.length < 8) { for (i = 0; i < sections.length && sections[i] !== ''; i++); const argv = [i, 1]; for (i = 9 - sections.length; i > 0; i--) { argv.push('0'); } sections.splice(...argv); } result = buff || Buffer.alloc(offset + 16); for (i = 0; i < sections.length; i++) { const word = parseInt(sections[i], 16); result[offset++] = (word >> 8) & 0xff; result[offset++] = word & 0xff; } } if (!result) { throw Error(`Invalid ip address: ${ip}`); } return result; }; ip.toString = function (buff, offset, length) { offset = ~~offset; length = length || (buff.length - offset); let result = []; if (length === 4) { // IPv4 for (let i = 0; i < length; i++) { result.push(buff[offset + i]); } result = result.join('.'); } else if (length === 16) { // IPv6 for (let i = 0; i < length; i += 2) { result.push(buff.readUInt16BE(offset + i).toString(16)); } result = result.join(':'); result = result.replace(/(^|:)0(:0)*:0(:|$)/, '$1::$3'); result = result.replace(/:{3,4}/, '::'); } return result; }; const ipv4Regex = /^(\d{1,3}\.){3,3}\d{1,3}$/; const ipv6Regex = /^(::)?(((\d{1,3}\.){3}(\d{1,3}){1})?([0-9a-f]){0,4}:{0,2}){1,8}(::)?$/i; ip.isV4Format = function (ip) { return ipv4Regex.test(ip); }; ip.isV6Format = function (ip) { return ipv6Regex.test(ip); }; function _normalizeFamily(family) { if (family === 4) { return 'ipv4'; } if (family === 6) { return 'ipv6'; } return family ? family.toLowerCase() : 'ipv4'; } ip.fromPrefixLen = function (prefixlen, family) { if (prefixlen > 32) { family = 'ipv6'; } else { family = _normalizeFamily(family); } let len = 4; if (family === 'ipv6') { len = 16; } const buff = Buffer.alloc(len); for (let i = 0, n = buff.length; i < n; ++i) { let bits = 8; if (prefixlen < 8) { bits = prefixlen; } prefixlen -= bits; buff[i] = ~(0xff >> bits) & 0xff; } return ip.toString(buff); }; ip.mask = function (addr, mask) { addr = ip.toBuffer(addr); mask = ip.toBuffer(mask); const result = Buffer.alloc(Math.max(addr.length, mask.length)); // Same protocol - do bitwise and let i; if (addr.length === mask.length) { for (i = 0; i < addr.length; i++) { result[i] = addr[i] & mask[i]; } } else if (mask.length === 4) { // IPv6 address and IPv4 mask // (Mask low bits) for (i = 0; i < mask.length; i++) { result[i] = addr[addr.length - 4 + i] & mask[i]; } } else { // IPv6 mask and IPv4 addr for (i = 0; i < result.length - 6; i++) { result[i] = 0; } // ::ffff:ipv4 result[10] = 0xff; result[11] = 0xff; for (i = 0; i < addr.length; i++) { result[i + 12] = addr[i] & mask[i + 12]; } i += 12; } for (; i < result.length; i++) { result[i] = 0; } return ip.toString(result); }; ip.cidr = function (cidrString) { const cidrParts = cidrString.split('/'); const addr = cidrParts[0]; if (cidrParts.length !== 2) { throw new Error(`invalid CIDR subnet: ${addr}`); } const mask = ip.fromPrefixLen(parseInt(cidrParts[1], 10)); return ip.mask(addr, mask); }; ip.subnet = function (addr, mask) { const networkAddress = ip.toLong(ip.mask(addr, mask)); // Calculate the mask's length. const maskBuffer = ip.toBuffer(mask); let maskLength = 0; for (let i = 0; i < maskBuffer.length; i++) { if (maskBuffer[i] === 0xff) { maskLength += 8; } else { let octet = maskBuffer[i] & 0xff; while (octet) { octet = (octet << 1) & 0xff; maskLength++; } } } const numberOfAddresses = 2 ** (32 - maskLength); return { networkAddress: ip.fromLong(networkAddress), firstAddress: numberOfAddresses <= 2 ? ip.fromLong(networkAddress) : ip.fromLong(networkAddress + 1), lastAddress: numberOfAddresses <= 2 ? ip.fromLong(networkAddress + numberOfAddresses - 1) : ip.fromLong(networkAddress + numberOfAddresses - 2), broadcastAddress: ip.fromLong(networkAddress + numberOfAddresses - 1), subnetMask: mask, subnetMaskLength: maskLength, numHosts: numberOfAddresses <= 2 ? numberOfAddresses : numberOfAddresses - 2, length: numberOfAddresses, contains(other) { return networkAddress === ip.toLong(ip.mask(other, mask)); }, }; }; ip.cidrSubnet = function (cidrString) { const cidrParts = cidrString.split('/'); const addr = cidrParts[0]; if (cidrParts.length !== 2) { throw new Error(`invalid CIDR subnet: ${addr}`); } const mask = ip.fromPrefixLen(parseInt(cidrParts[1], 10)); return ip.subnet(addr, mask); }; ip.not = function (addr) { const buff = ip.toBuffer(addr); for (let i = 0; i < buff.length; i++) { buff[i] = 0xff ^ buff[i]; } return ip.toString(buff); }; ip.or = function (a, b) { a = ip.toBuffer(a); b = ip.toBuffer(b); // same protocol if (a.length === b.length) { for (let i = 0; i < a.length; ++i) { a[i] |= b[i]; } return ip.toString(a); // mixed protocols } let buff = a; let other = b; if (b.length > a.length) { buff = b; other = a; } const offset = buff.length - other.length; for (let i = offset; i < buff.length; ++i) { buff[i] |= other[i - offset]; } return ip.toString(buff); }; ip.isEqual = function (a, b) { a = ip.toBuffer(a); b = ip.toBuffer(b); // Same protocol if (a.length === b.length) { for (let i = 0; i < a.length; i++) { if (a[i] !== b[i]) return false; } return true; } // Swap if (b.length === 4) { const t = b; b = a; a = t; } // a - IPv4, b - IPv6 for (let i = 0; i < 10; i++) { if (b[i] !== 0) return false; } const word = b.readUInt16BE(10); if (word !== 0 && word !== 0xffff) return false; for (let i = 0; i < 4; i++) { if (a[i] !== b[i + 12]) return false; } return true; }; ip.isPrivate = function (addr) { return /^(::f{4}:)?10\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i .test(addr) || /^(::f{4}:)?192\.168\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^(::f{4}:)?172\.(1[6-9]|2\d|30|31)\.([0-9]{1,3})\.([0-9]{1,3})$/i .test(addr) || /^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^(::f{4}:)?169\.254\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || /^f[cd][0-9a-f]{2}:/i.test(addr) || /^fe80:/i.test(addr) || /^::1$/.test(addr) || /^::$/.test(addr); }; ip.isPublic = function (addr) { return !ip.isPrivate(addr); }; ip.isLoopback = function (addr) { return /^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})/ .test(addr) || /^fe80::1$/.test(addr) || /^::1$/.test(addr) || /^::$/.test(addr); }; ip.loopback = function (family) { // // Default to `ipv4` // family = _normalizeFamily(family); if (family !== 'ipv4' && family !== 'ipv6') { throw new Error('family must be ipv4 or ipv6'); } return family === 'ipv4' ? '127.0.0.1' : 'fe80::1'; }; // // ### function address (name, family) // #### @name {string|'public'|'private'} **Optional** Name or security // of the network interface. // #### @family {ipv4|ipv6} **Optional** IP family of the address (defaults // to ipv4). // // Returns the address for the network interface on the current system with // the specified `name`: // * String: First `family` address of the interface. // If not found see `undefined`. // * 'public': the first public ip address of family. // * 'private': the first private ip address of family. // * undefined: First address with `ipv4` or loopback address `127.0.0.1`. // ip.address = function (name, family) { const interfaces = os.networkInterfaces(); // // Default to `ipv4` // family = _normalizeFamily(family); // // If a specific network interface has been named, // return the address. // if (name && name !== 'private' && name !== 'public') { const res = interfaces[name].filter((details) => { const itemFamily = _normalizeFamily(details.family); return itemFamily === family; }); if (res.length === 0) { return undefined; } return res[0].address; } const all = Object.keys(interfaces).map((nic) => { // // Note: name will only be `public` or `private` // when this is called. // const addresses = interfaces[nic].filter((details) => { details.family = _normalizeFamily(details.family); if (details.family !== family || ip.isLoopback(details.address)) { return false; } if (!name) { return true; } return name === 'public' ? ip.isPrivate(details.address) : ip.isPublic(details.address); }); return addresses.length ? addresses[0].address : undefined; }).filter(Boolean); return !all.length ? ip.loopback(family) : all[0]; }; ip.toLong = function (ip) { let ipl = 0; ip.split('.').forEach((octet) => { ipl <<= 8; ipl += parseInt(octet); }); return (ipl >>> 0); }; ip.fromLong = function (ipl) { return (`${ipl >>> 24}.${ ipl >> 16 & 255}.${ ipl >> 8 & 255}.${ ipl & 255}`); };