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