Quelle ip.js Sprache: JAVA

'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 || Buffer.alloc(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 || Buffer.alloc(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 = Buffer.alloc(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 = Buffer.alloc(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) );
};

quality80%

¤ Dauer der Verarbeitung: 0.5 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.