Dreamcast-Talk.com

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[12/Jan/2023:01:43:05 +0000] "POST /cgi-bin/auth.cgi HTTP/1.0" 404 214 "-" "Mozilla/3.0 (DreamPas
sport/2.0; SEGA/Auth)"

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commodity_id=S00001S0000211190101&user_id=flycast1&login_password=password

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Reject_cause:<Number> Limit_date:<string/bytes?> Illegal_user:<Number>

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Reject_cause:0 Illegal_user:0

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Reject Causes

0 - Auth OK
1 - Bad Password
2 - Unregistered User
3 - Locked Out (You entered a wrong pwd too many times)
4 - Temp Password Expired (Error msg talks about account creation. Probably you got a temp password when a Dricas account was made)
5 - Unauthorized User (Translates as "We are currently discontinuing customer use". Either banned or the game is deactivated?)
6 - Paused (Similar msg as above)
7 - Expired (Your license has expired, please buy a new one. Prob for monthly paid games.)
8 - Unpurchased Rights (License has not been purchased. Go buy one.)
9 - Under Maintenance

16 - Bad Protocol
17 - DB Failure
18 - Pref Error

Illegal User Types (Only used when reject cause == 0)

0 - Auth OK
1 - Attention User
2 - Warning User 
3 - Unauthorized User
else - Other Unknown Reasons

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If type & 0x1F != 0, encrypt it. Packet looks like:

[headerSize (always 0xC)][type][payloadSize][ip][crc32][data]

In the data it usually has a header like this but the counts can be used in other ways: 

[opcode][responseCode][count1][count2][maxCount]

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        private int ParsePacket(byte[] data, int offset, int maxLength, out byte outType, out byte[] outPayload)
        {
            outType = 0;
            outPayload = null;

            int bytesRemaining = maxLength - offset;

            // Is there a header?
            if (bytesRemaining < 0xC)
                return 0;

            // Get details
            byte type = data[offset + 1];
            ushort payloadSize = (ushort)((data[offset + 3] << 8) | data[offset + 2]);

            // Is the full packet here?
            if (bytesRemaining < payloadSize)
                return 0;

            // The rest of the packet
            uint ipAddr = BitConverter.ToUInt32(data, offset + 4);
            uint checksum = BitConverter.ToUInt32(data, offset + 8);

            byte[] payload = new byte[payloadSize];
            Array.Copy(data, offset + 0xc, payload, 0, payloadSize);

            // Check CRC32
            uint crc32 = Utils.CalcCRC32(payload);
            if (crc32 != checksum)
                return 0;

            // Decrypt if needed
            if ((type & 0x20) != 0)
                server.GetBlowfish().Decrypt(payload);

            // Done!
            outType = type;
            outPayload = payload;
            return payloadSize + 0xc;
        }

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      if (state == 0) {
        ned_waitOthers(proceedResult);
      }
      else if (state == 2) {
        ned_waitStart();
      }
      else if (state == 3) {
        ned_syncStep1();
      }
      else if (state == 4) {
        ned_syncStep2();
      }
      else if (state == 5) {
        ned_receivedDataState();
      }
      else if (state == 6) {
        ned_gameplayState();
      }