Starting Point How Does It Work

[hasokeric]

Hey guys i have a question i have a tough time picturing.

How do you know the Game packets that need to be send, replied back etc..

For example

enum eAuthResults
{
   REALM_AUTH_SUCCESS              = 0x00,
   REALM_AUTH_FAILURE              = 0x01,                 ///< Unable to connect
   REALM_AUTH_UNKNOWN1             = 0x02,                 ///< Unable to connect
   REALM_AUTH_ACCOUNT_BANNED       = 0x03,                 ///< This <game> account has been closed and is no longer available for use. Please go to <site>/banned.html for further information.
   REALM_AUTH_NO_MATCH             = 0x04,                 ///< The information you have entered is not valid. Please check the spelling of the account name and password. If you need help in retrieving a lost or stolen password, see <site> for more information
   REALM_AUTH_UNKNOWN2             = 0x05,                 ///< The information you have entered is not valid. Please check the spelling of the account name and password. If you need help in retrieving a lost or stolen password, see <site> for more information
   REALM_AUTH_ACCOUNT_IN_USE       = 0x06,                 ///< This account is already logged into <game>. Please check the spelling and try again.
   REALM_AUTH_PREPAID_TIME_LIMIT   = 0x07,                 ///< You have used up your prepaid time for this account. Please purchase more to continue playing
   REALM_AUTH_SERVER_FULL          = 0x08,                 ///< Could not log in to <game> at this time. Please try again later.
   REALM_AUTH_WRONG_BUILD_NUMBER   = 0x09,                 ///< Unable to validate game version. This may be caused by file corruption or interference of another program. Please visit <site> for more information and possible solutions to this issue.
   REALM_AUTH_UPDATE_CLIENT        = 0x0a,                 ///< Downloading
   REALM_AUTH_UNKNOWN3             = 0x0b,                 ///< Unable to connect
   REALM_AUTH_ACCOUNT_FREEZED      = 0x0c,                 ///< This <game> account has been temporarily suspended. Please go to <site>/banned.html for further information
   REALM_AUTH_UNKNOWN4             = 0x0d,                 ///< Unable to connect
   REALM_AUTH_UNKNOWN5             = 0x0e,                 ///< Connected.
   REALM_AUTH_PARENTAL_CONTROL     = 0x0f                  ///< Access to this account has been blocked by parental controls. Your settings may be changed in your account preferences at <site>
};

How do you figure out these codes - if you do sniffing is it not Encrypted atleast with strong RSA ?

Is there a tutorial how 'one' starts making a simple 'C++ MMORPG Server' i would like to join MANGOS and pitch in however i have alot to learn i do know C++ pretty well however emulating a server is something way beyond i have ever done.

This is why i am asking is there a tutorial how to 'from scratch' get for example a WoW Login to work - which would give me and maybe others a picture how you actually figure out the packets and how you reply etc..

you get my question i hope

i thx in advanced