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'use strict';
var ip = exports;
var Buffer = require('buffer').Buffer;
var os = require('os');
ip.toBuffer = function(ip, buff, offset) {
offset = ~~offset;
var result;
if (this.isV4Format(ip)) {
result = buff || new Buffer(offset + 4);
ip.split(/\./g).map(function(byte) {
result[offset++] = parseInt(byte, 10) & 0xff;
});
} else if (this.isV6Format(ip)) {
var sections = ip.split(':', 8);
var i;
for (i = 0; i < sections.length; i++) {
var isv4 = this.isV4Format(sections[i]);
var 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++);
var argv = [ i, 1 ];
for (i = 9 - sections.length; i > 0; i--) {
argv.push('0');
}
sections.splice.apply(sections, argv);
}
result = buff || new Buffer(offset + 16);
for (i = 0; i < sections.length; i++) {
var 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);
var result = [];
if (length === 4) {
// IPv4
for (var i = 0; i < length; i++) {
result.push(buff[offset + i]);
}
result = result.join('.');
} else if (length === 16) {
// IPv6
for (var i = 0; i < length; i += 2) {
result.push(buff.readUInt16BE(offset + i).toString(16));
}
result = result.join(':');
result = result.replace(/(^|:)0(:0)*:0(:|$)/, '$1::$3');
result = result.replace(/:{3,4}/, '::');
}
return result;
};
var ipv4Regex = /^(\d{1,3}\.){3,3}\d{1,3}$/;
var 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) {
return family ? family.toLowerCase() : 'ipv4';
}
ip.fromPrefixLen = function(prefixlen, family) {
if (prefixlen > 32) {
family = 'ipv6';
} else {
family = _normalizeFamily(family);
}
var len = 4;
if (family === 'ipv6') {
len = 16;
}
var buff = new Buffer(len);
for (var i = 0, n = buff.length; i < n; ++i) {
var 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);
var result = new Buffer(Math.max(addr.length, mask.length));
var i = 0;
// Same protocol - do bitwise and
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 (var 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 = i + 12;
}
for (; i < result.length; i++)
result[i] = 0;
return ip.toString(result);
};
ip.cidr = function(cidrString) {
var cidrParts = cidrString.split('/');
var addr = cidrParts[0];
if (cidrParts.length !== 2)
throw new Error('invalid CIDR subnet: ' + addr);
var mask = ip.fromPrefixLen(parseInt(cidrParts[1], 10));
return ip.mask(addr, mask);
};
ip.subnet = function(addr, mask) {
var networkAddress = ip.toLong(ip.mask(addr, mask));
// Calculate the mask's length.
var maskBuffer = ip.toBuffer(mask);
var maskLength = 0;
for (var i = 0; i < maskBuffer.length; i++) {
if (maskBuffer[i] === 0xff) {
maskLength += 8;
} else {
var octet = maskBuffer[i] & 0xff;
while (octet) {
octet = (octet << 1) & 0xff;
maskLength++;
}
}
}
var numberOfAddresses = Math.pow(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: function(other) {
return networkAddress === ip.toLong(ip.mask(other, mask));
}
};
};
ip.cidrSubnet = function(cidrString) {
var cidrParts = cidrString.split('/');
var addr = cidrParts[0];
if (cidrParts.length !== 2)
throw new Error('invalid CIDR subnet: ' + addr);
var mask = ip.fromPrefixLen(parseInt(cidrParts[1], 10));
return ip.subnet(addr, mask);
};
ip.not = function(addr) {
var buff = ip.toBuffer(addr);
for (var 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 (var i = 0; i < a.length; ++i) {
a[i] |= b[i];
}
return ip.toString(a);
// mixed protocols
} else {
var buff = a;
var other = b;
if (b.length > a.length) {
buff = b;
other = a;
}
var offset = buff.length - other.length;
for (var 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 (var i = 0; i < a.length; i++) {
if (a[i] !== b[i]) return false;
}
return true;
}
// Swap
if (b.length === 4) {
var t = b;
b = a;
a = t;
}
// a - IPv4, b - IPv6
for (var i = 0; i < 10; i++) {
if (b[i] !== 0) return false;
}
var word = b.readUInt16BE(10);
if (word !== 0 && word !== 0xffff) return false;
for (var 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) {
var interfaces = os.networkInterfaces();
var all;
//
// Default to `ipv4`
//
family = _normalizeFamily(family);
//
// If a specific network interface has been named,
// return the address.
//
if (name && name !== 'private' && name !== 'public') {
var res = interfaces[name].filter(function(details) {
var itemFamily = details.family.toLowerCase();
return itemFamily === family;
});
if (res.length === 0)
return undefined;
return res[0].address;
}
var all = Object.keys(interfaces).map(function (nic) {
//
// Note: name will only be `public` or `private`
// when this is called.
//
var addresses = interfaces[nic].filter(function (details) {
details.family = details.family.toLowerCase();
if (details.family !== family || ip.isLoopback(details.address)) {
return false;
} else 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) {
var ipl = 0;
ip.split('.').forEach(function(octet) {
ipl <<= 8;
ipl += parseInt(octet);
});
return(ipl >>> 0);
};
ip.fromLong = function(ipl) {
return ((ipl >>> 24) + '.' +
(ipl >> 16 & 255) + '.' +
(ipl >> 8 & 255) + '.' +
(ipl & 255) );
};