Question about NetworkStreamSendSpecial

Quote:

Originally Posted by ozuromo Ok. So this is NetworkStream::SendAttackPacket assembly: [Only registered and activated users can see links. Click Here To Register...] In the end of this function we have: [Only registered and activated users can see links. Click Here To Register...] The complete code I use to try to simulate this, is: Code: struct TPacketCGAttack { BYTE header; BYTE bType; DWORD dwVictimVID; }; typedef bool(__thiscall* typeNetSendSpecial)(void* This, int nLen, void* pvBuf); typedef bool(__thiscall* typeNetSendSequence)(void* This); typeNetSendSpecial NetSendSpecial = (typeNetSendSpecial)(baseAddress + 0x1EB5E0); typeNetSendSequence NetSendSequence = (typeNetSendSequence)(baseAddress + 0x2A5240); TPacketCGAttack kPacketAtk; kPacketAtk.header = 0x52; kPacketAtk.bType = 0; kPacketAtk.dwVictimVID = dwVID; NetSendSpecial((void*)netInstance, sizeof(kPacketAtk), &kPacketAtk); NetSendSequence((void*)netInstance); I get the dwVID by using GetTargetVid, and I know it's right because if I use it in SendAttackPacket it works. The reason why I'm trying to use SendSpecial is to see if it works better. When I execute this code nothing happens! If I don't call SendSequence or change the Header I get instantly disconnected. I tried using the analogous function for Archers, which is AddFlyTargetingPacket and SendShootPacket, and the same thing happens, I don't give any damage but the arrows disappear from my inventory...

struct TPacketCGAttack
{
    BYTE	header;//1
    BYTE	bType;//2
    DWORD	dwVictimVID;//6
};

Quote:

Originally Posted by HelloBrightness Thanks for the Informations, you're using the wrong struct. You can see it in the disassembly. You accessing ebp-08 for for the Header (first byte, 8-1 total = 7 left), ebp-7 for the type (second byte, 8-1-1 total = 6 left total), ebp-6 for the dword/vid (first dowrd, 8-1-1-4 = 2 left total) - you have to append these missing two bytes. You could've noticed this sooner, you wrote yourself "8 push sizeof(kPacket) to the stack" Code: struct TPacketCGAttack { BYTE header;//1 BYTE bType;//2 DWORD dwVictimVID;//6 }; is to small

Quote:

Originally Posted by MrCrisp Either, it is fixed on your server, or you are too far away from the monster. Try it on a metin stone or a mob that is really close to you.

Quote:

Originally Posted by ozuromo It's no that, if you do sizeof(TPacketCGAttack) you will get 8. And if I use 2 more bytes I get disconnected too.

#include <stdio.h>
int main()
{
    struct TPacketCGAttack_B { //size of BYTE
        unsigned char test;
    };
    
    struct TPacketCGAttack_D { //size of DWORD
        unsigned int test;
    };
    
    
    struct TPacketCGAttack1 { //only one BYTE
        unsigned char header;
    };
    
    struct TPacketCGAttack2 { //adding one BYTE, having two BYTES
        unsigned char header;
        unsigned char bType;
    };
    
    struct TPacketCGAttack3 { //adding four BYTES aka. a DWORD, having 6 BYTES
        unsigned char header;
        unsigned char bType;
        unsigned int dwVictimVID;
    };
    
    
    printf("TPacketCGAttack_B: %ld\nTPacketCGAttack_D: %ld\nTPacketCGAttack1: %ld\nTPacketCGAttack2: %ld\nTPacketCGAttack3: %ld", sizeof(TPacketCGAttack_B), sizeof(TPacketCGAttack_D), sizeof(TPacketCGAttack1), sizeof(TPacketCGAttack2), sizeof(TPacketCGAttack3));

    return 0;
}

Quote:

Originally Posted by ozuromo It's no that, if you do sizeof(TPacketCGAttack) you will get 8. And if I use 2 more bytes I get disconnected too.

Quote:

Originally Posted by MrCrisp Make sure you align the structs correctly! They have to be aligned by a byte, not by 4 bytes. See the pragma pack operator for further details.

#pragma pack(pop)
#pragma pack(push, 1)
struct  TPacketCGAttack
{
    BYTE	header;
    BYTE	bType;
    DWORD	dwVictimVID;
    BYTE	bCRCMagicCubeProcPiece;
    BYTE	bCRCMagicCubeFilePiece;
};