Function parseResponseAddress

lib/core/socks5-utils.js:116–181

* Parse address from SOCKS5 response * @param {Buffer} buffer - Buffer containing the address * @param {number} offset - Starting offset in buffer * @returns {{address: string, port: number, bytesRead: number}}

(buffer, offset = 0)

 * @returns {{address: string, port: number, bytesRead: number}}
 */
function parseResponseAddress (buffer, offset = 0) {
  if (buffer.length < offset + 1) {
    throw new InvalidArgumentError('Buffer too small to contain address type')
  }

  const addressType = buffer[offset]
  let address
  let currentOffset = offset + 1

  switch (addressType) {
    case 0x01: { // IPv4
      if (buffer.length < currentOffset + 6) {
        throw new InvalidArgumentError('Buffer too small for IPv4 address')
      }
      address = Array.from(buffer.subarray(currentOffset, currentOffset + 4)).join('.')
      currentOffset += 4
      break
    }

    case 0x03: { // Domain
      if (buffer.length < currentOffset + 1) {
        throw new InvalidArgumentError('Buffer too small for domain length')
      }
      const domainLength = buffer[currentOffset]
      currentOffset += 1

      if (buffer.length < currentOffset + domainLength + 2) {
        throw new InvalidArgumentError('Buffer too small for domain address')
      }
      address = buffer.subarray(currentOffset, currentOffset + domainLength).toString('utf8')
      currentOffset += domainLength
      break
    }

    case 0x04: { // IPv6
      if (buffer.length < currentOffset + 18) {
        throw new InvalidArgumentError('Buffer too small for IPv6 address')
      }
      // Convert buffer to IPv6 string
      const parts = []
      for (let i = 0; i < 8; i++) {
        const value = buffer.readUInt16BE(currentOffset + i * 2)
        parts.push(value.toString(16))
      }
      address = parts.join(':')
      currentOffset += 16
      break
    }

    default:
      throw new InvalidArgumentError(`Invalid address type: ${addressType}`)
  }

  // Parse port
  if (buffer.length < currentOffset + 2) {
    throw new InvalidArgumentError('Buffer too small for port')
  }
  const port = buffer.readUInt16BE(currentOffset)