SocksCmdResponse Class — netty Architecture

Source Code

codec-socks/src/main/java/io/netty/handler/codec/socks/SocksCmdResponse.java lines 32–174

public final class SocksCmdResponse extends SocksResponse {
    private final SocksCmdStatus cmdStatus;

    private final SocksAddressType addressType;
    private final String host;
    private final int port;

    // All arrays are initialized on construction time to 0/false/null remove array Initialization
    private static final byte[] DOMAIN_ZEROED = {0x00};
    private static final byte[] IPv4_HOSTNAME_ZEROED = {0x00, 0x00, 0x00, 0x00};
    private static final byte[] IPv6_HOSTNAME_ZEROED = {0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00};

    public SocksCmdResponse(SocksCmdStatus cmdStatus, SocksAddressType addressType) {
        this(cmdStatus, addressType, null, 0);
    }

    /**
     * Constructs new response and includes provided host and port as part of it.
     *
     * @param cmdStatus status of the response
     * @param addressType type of host parameter
     * @param host host (BND.ADDR field) is address that server used when connecting to the target host.
     *             When null a value of 4/8 0x00 octets will be used for IPv4/IPv6 and a single 0x00 byte will be
     *             used for domain addressType. Value is converted to ASCII using {@link IDN#toASCII(String)}.
     * @param port port (BND.PORT field) that the server assigned to connect to the target host
     * @throws NullPointerException in case cmdStatus or addressType are missing
     * @throws IllegalArgumentException in case host or port cannot be validated
     * @see IDN#toASCII(String)
     */
    public SocksCmdResponse(SocksCmdStatus cmdStatus, SocksAddressType addressType, String host, int port) {
        super(SocksResponseType.CMD);
        ObjectUtil.checkNotNull(cmdStatus, "cmdStatus");
        ObjectUtil.checkNotNull(addressType, "addressType");
        if (host != null) {
            switch (addressType) {
                case IPv4:
                    if (!NetUtil.isValidIpV4Address(host)) {
                        throw new IllegalArgumentException(host + " is not a valid IPv4 address");
                    }
                    break;
                case DOMAIN:
                    String asciiHost = IDN.toASCII(host);
                    if (asciiHost.length() > 255) {
                        throw new IllegalArgumentException(host + " IDN: " + asciiHost + " exceeds 255 char limit");
                    }
                    host = asciiHost;
                    break;
                case IPv6:
                    if (!NetUtil.isValidIpV6Address(host)) {
                        throw new IllegalArgumentException(host + " is not a valid IPv6 address");
                    }
                    break;
                case UNKNOWN:
                    break;
            }
        }
        if (port < 0 || port > 65535) {
            throw new IllegalArgumentException(port + " is not in bounds 0 <= x <= 65535");
        }
        this.cmdStatus = cmdStatus;
        this.addressType = addressType;
        this.host = host;
        this.port = port;
    }

    /**
     * Returns the {@link SocksCmdStatus} of this {@link SocksCmdResponse}
     *
     * @return The {@link SocksCmdStatus} of this {@link SocksCmdResponse}
     */
    public SocksCmdStatus cmdStatus() {
        return cmdStatus;
    }

    /**
     * Returns the {@link SocksAddressType} of this {@link SocksCmdResponse}
     *
     * @return The {@link SocksAddressType} of this {@link SocksCmdResponse}