Function parseIPv6

lib/core/socks5-utils.js:47–90

* Parse IPv6 address to buffer * @param {string} address - IPv6 address string * @returns {Buffer} 16-byte buffer

(address)

 * @returns {Buffer} 16-byte buffer
 */
function parseIPv6 (address) {
  const buffer = Buffer.alloc(16)
  let normalizedAddress = address

  // Expand an embedded IPv4 tail into the last two IPv6 groups.
  if (address.includes('.')) {
    const lastColonIndex = address.lastIndexOf(':')
    const ipv4Part = address.slice(lastColonIndex + 1)

    if (net.isIPv4(ipv4Part)) {
      const octets = ipv4Part.split('.').map(Number)
      const high = ((octets[0] << 8) | octets[1]).toString(16)
      const low = ((octets[2] << 8) | octets[3]).toString(16)
      normalizedAddress = `${address.slice(0, lastColonIndex)}:${high}:${low}`
    }
  }

  // Handle compressed notation (::)
  const doubleColonIndex = normalizedAddress.indexOf('::')
  if (doubleColonIndex !== -1) {
    const before = normalizedAddress.slice(0, doubleColonIndex)
    const after = normalizedAddress.slice(doubleColonIndex + 2)
    const beforeParts = before === '' ? [] : before.split(':')
    const afterParts = after === '' ? [] : after.split(':')

    let bufferIndex = 0
    for (const part of beforeParts) {
      buffer.writeUInt16BE(parseInt(part, 16), bufferIndex)
      bufferIndex += 2
    }
    bufferIndex = 16 - afterParts.length * 2
    for (const part of afterParts) {
      buffer.writeUInt16BE(parseInt(part, 16), bufferIndex)
      bufferIndex += 2
    }
  } else {
    const parts = normalizedAddress.split(':')
    for (let i = 0; i < parts.length; i++) {
      buffer.writeUInt16BE(parseInt(parts[i], 16), i * 2)
    }
  }

  return buffer
}

/**
 * Build a SOCKS5 address buffer