/SteamKit2/SteamKit2/Steam2/ConfigServerClient.cs

/*

 * This file is subject to the terms and conditions defined in

 * file 'license.txt', which is part of this source code package.

 */





using System;



namespace SteamKit2

{

    /// <summary>

    /// This client is capable of connecting to a config server.

    /// </summary>

    public sealed class ConfigServerClient : ServerClient

    {

        /// <summary>

        /// Initializes a new instance of the <see cref="ConfigServerClient"/> class.

        /// </summary>

        public ConfigServerClient()

        {

        }



        /// <summary>

        /// Requests the network key from the config server.

        /// </summary>

        /// <returns>The network key.</returns>

        public byte[] GetNetworkKey()

        {

            if ( !this.HandshakeServer( ESteam2ServerType.ConfigServer ) )

                return null;



            uint externalIp = this.Socket.Reader.ReadUInt32();



            if ( !this.SendCommand( 4 ) ) // command: get network key

                return null;



            ushort keyLen = NetHelpers.EndianSwap( this.Socket.Reader.ReadUInt16() );

            byte[] key = this.Socket.Reader.ReadBytes( keyLen );



            ushort sigLen = NetHelpers.EndianSwap( this.Socket.Reader.ReadUInt16() );

            byte[] signature = this.Socket.Reader.ReadBytes( sigLen );



            return key;

        }



        /// <summary>

        /// Gets the current content description record (CDR) provided by the config server.

        /// Optionally accepts an old CDR hash in order to determine if a new CDR should be downloaded or not.

        /// The old CDR hash is a SHA-1 hash of the entire CDR payload.

        /// </summary>

        /// <param name="oldCDRHash">An optional CDR hash.</param>

        /// <returns>A byte blob representing the CDR on success; otherwise, <c>null</c>.</returns>

        public byte[] GetContentDescriptionRecord( byte[] oldCDRHash = null )

        {

            try

            {

                if ( !this.HandshakeServer( ESteam2ServerType.ConfigServer ) )

                    return null;



                uint externalIp = Socket.Reader.ReadUInt32();



                if ( oldCDRHash == null )

                    oldCDRHash = new byte[ 20 ];



                if ( !SendCommand( 9, oldCDRHash ) )

                {

                    return null;

                }



                byte[] unk = Socket.Reader.ReadBytes( 11 );



                TcpPacket pack = Socket.ReceivePacket();

                Socket.Disconnect();



                if ( pack == null )

                    return null;



                return pack.GetPayload();

            }

            catch ( Exception ex )

            {

                DebugLog.WriteLine( "ConfigServerClient", "GetContentDescriptionRecord threw an exception.\n{0}", ex.ToString() );



                Socket.Disconnect();

                return null;

            }



        }



        /// <summary>

        /// Requests the client config record from the server.

        /// </summary>

        /// <returns>A binary blob that represents the config record on success; otherwise <c>null</c>.</returns>

        public byte[] GetClientConfigRecord()

        {



            if ( !this.HandshakeServer( ESteam2ServerType.ConfigServer ) )

            {

                this.Disconnect();

                return null;

            }



            uint externalIp = Socket.Reader.ReadUInt32();



            if ( !this.SendCommand( 1 ) ) // command: Get CCR

            {

                return null;

            }



            TcpPacket pack = Socket.ReceivePacket();

            this.Disconnect();



            if ( pack == null )

                return null;



            return pack.GetPayload();

        }

    }

}