//LOGIN
private bool action_login()
{
//init user id to blank
UserID = "";
string temp = "";
//init number of tries to 0
int numtries = 0;
//Loop until user id is not blank
while (UserID == "")
{
//prompt for user id
chatserver.Write(client.GetStream(),
AuthenticationProtocolValues.USERID_PROMPT);
temp = chatserver.Read(client.GetStream());
//check if user is registered
//allow up to 3 tries
if (!IsRegisteredUser(temp))
{
chatserver.Write(client.GetStream(),
AuthenticationProtocolValues.USER_NOT_REGISTERED_MSG);
if (++numtries >= 3)
{
return(false);
}
continue;
}
else
{
UserID = temp; //assign valid user id
}
}
//init to blank
Password = "";
//init number of tries to 0
numtries = 0;
//Loop until password is not blank
while (Password == "")
{
//prompt for password
chatserver.Write(client.GetStream(),
AuthenticationProtocolValues.PASSWORD_PROMPT);
temp = chatserver.Read(client.GetStream());
//check if password is correct
if (!IsUserPassword(UserID, temp))
{
if (++numtries >= 3)
{
return(false);
}
continue;
}
else
{
Password = temp; //OK password is assigned
}
}
//Check if user already has a active connection
if (chatserver.ClientConnections[UserID.ToUpper()] != null)
{
chatserver.Write(client.GetStream(),
AuthenticationProtocolValues.USER_ALREADY_LOGGED_IN);
return(false);
}
return(true);
}