[8378] Use exceptions instead of explicit size checking for each packet Author: arrai

CHECK_PACKET_SIZE was pretty error prone; once it was forgotten mangosd
    could crash due to the asserts in ByteBuffer.h. That was exploitable by
    malicious players.
    Furthermore, there were duplicate checks: Additionally to
    CHECK_PACKET_SIZE, the ByteBuffer assertions keept an eye
    on not exceeding the packet boundaries - just to crash the server for
    sure in such a case.
    To prevent memory leaks or other undesirable states, please read in
    every handler all variables _before_ doing any concrete handling.

--HG--
branch : trunk

src/game/CombatHandler.cpp

@@ -28,8 +28,6 @@
 
 void WorldSession::HandleAttackSwingOpcode( WorldPacket & recv_data )
 {
-    CHECK_PACKET_SIZE(recv_data,8);
-
     uint64 guid;
     recv_data >> guid;
 
@@ -68,8 +66,6 @@ void WorldSession::HandleAttackStopOpcode( WorldPacket & /*recv_data*/ )
 
 void WorldSession::HandleSetSheathedOpcode( WorldPacket & recv_data )
 {
-    CHECK_PACKET_SIZE(recv_data,4);
-
     uint32 sheathed;
     recv_data >> sheathed;