Added pincode state tracking (#8412)

Fixes #6595

Thanks to @Danil0v3s

src/char/char.hpp

@@ -266,6 +266,7 @@ struct char_session_data {
 	uint32 pincode_seed;
 	time_t pincode_change;
 	uint16 pincode_try;
+	bool pincode_correct;
 	// Addon system
 	unsigned int char_moves[MAX_CHARS]; // character moves left
 	uint8 isvip;

src/char/char_clif.cpp

@@ -182,6 +182,7 @@ int chclif_parse_pincode_check( int fd, struct char_session_data* sd ){
 	}
 
 	if( char_pincode_compare( fd, sd, pin ) ){
+		sd->pincode_correct = true;
 		chclif_pincode_sendstate( fd, sd, PINCODE_PASSED );
 	}
 	return 1;
@@ -322,6 +323,7 @@ int chclif_parse_pincode_setnew( int fd, struct char_session_data* sd ){
 		if( pincode_allowed(newpin) ){
 			chlogif_pincode_notifyLoginPinUpdate( sd->account_id, newpin );
 			strncpy( sd->pincode, newpin, sizeof( newpin ) );
+			sd->pincode_correct = true;
 
 			chclif_pincode_sendstate( fd, sd, PINCODE_PASSED );
 		}else{
@@ -757,6 +759,7 @@ int chclif_parse_reqtoconnect(int fd, struct char_session_data* sd,uint32 ipl){
 		sd->login_id2 = login_id2;
 		sd->sex = sex;
 		sd->auth = false; // not authed yet
+		sd->pincode_correct = false; // not entered pincode correctly yet
 
 		// send back account_id
 		WFIFOHEAD(fd,4);
@@ -1569,6 +1572,44 @@ int chclif_parse(int fd) {
 		unsigned short cmd;
 
 		cmd = RFIFOW(fd,0);
+
+#if PACKETVER_SUPPORTS_PINCODE
+		// If the pincode system is enabled
+		if( charserv_config.pincode_config.pincode_enabled ){
+			switch( cmd ){
+				// Connect of player
+				case 0x65:
+				// Client keep-alive packet (every 12 seconds)
+				case 0x187:
+				// Checks the entered pin
+				case 0x8b8:
+				// Request for PIN window
+				case 0x8c5:
+				// Request character list
+				case 0x9a1:
+				// Connect of map-server
+				case 0x2af8:
+					break;
+
+				// Before processing any other packets, do a few checks
+				default:
+					// If the pincode was entered correctly
+					if( sd->pincode_correct ){
+						break;
+					}
+
+					// If no pincode is set (yet)
+					if( strlen( sd->pincode ) <= 0 ){
+						break;
+					}
+
+					// The pincode was not entered correctly, yet the player (=bot) tried to send a different packet => Goodbye!
+					set_eof( fd );
+					return 0;
+			}
+		}
+#endif
+
 		switch( cmd ) {
 			case 0x65: next=chclif_parse_reqtoconnect(fd,sd,ipl); break;
 			// char select