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POAuthenticating users on a Qt Server
 

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    <p>I am trying to implement an authentication system using C++/QtTcpSocket for a personal project (A Multiplayer Chess Game).</p> <p>My friend suggested a method for verifying a user but I wanted to ask if there was an easier or better way. Coming from a Python background and mostly doing this project to develop a deeper understanding of C++.</p> <p>I will post the method my friend suggested and ask for maybe a better solution.</p> <p>He built it in a kind of pseudo code fashion. The server is mostly built, I am now hoping to implement Authentication</p> <p>*cheers</p> <pre><code>void process_packet(PACKET *pkt) { switch(pkt-&gt;PacketID) { case 0: // let's say packet id 0 is the logon packet; packet contents are username and password { //let's say packet size is 101 bytes; packet id was already received, so get the other 100 bytes unsigned char BUFFER[101] = {0}; // i always add an extra byte to the end of the buffer to allow for off-by-one errors ^_^ int result = recv_packet(pkt-&gt;cSocket, 100, BUFFER); if(result &lt;= 0) return; // connection error; no packet data was received unsigned char *UserName = BUFFER+0; //+0 is not neccessary, but the username starts at the beginning. just getting the point across. unsigned char *PassWord = BUFFER+50; //side note: if we did "unsigned long *blah = BUFFER+4" or something, we would have to make sure the byte order is right. network byte order is BIG ENDIAN // WINDOWS byte order is LITTLE ENDIAN result = QueryDatabase("SELECT username, password FROM chess_players WHERE username = '%s'", FILTER_INVALID_CHARS(UserName)); // check result unsigned char ServerResponse[2] = {0}; if(result['password'] == PassWord) { ServerResponse[0] = 1; // packet id will be 1. the next byte can be 1 or 0 to indicate logon success or failure. ServerResponse[1] = true; // so packet 0x0101 mean logon success, packet 0x0100 means logon failure send_packet(pkt-&gt;cSocket, ServerResponse, 2); } else { ServerResponse[0] = 1; ServerResponse[1] = false; send_packet(pkt-&gt;cSocket, ServerResponse, 2); } } break; default: { // received an unknown packet id; send a packet to the client that indicates an error_status_t unsigned char *ServerResponse[2] = {0}; ServerResponse[0] = 2; // packet id 2 means server error ServerResponse[1] = 0; // error code 0 means 'unknown packet id' send_packet(pkt_cSocket, ServerResponse, 2); } break; } delete pkt; // must delete pkt, was created with 'new' in get_client_packets() } </code></pre>
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