[Guide] Handling Client Networking @ Any State Process

[thaidu0ngpr0]

Originally Posted by #HB

Hey there,

I've been hella busy lately, some guy asked me about handling messages in client-side like a week ago, I told 'em I'll make a guide and I totally got busy & forgot.

Anyways, lets get into this.




Note: Structures don't really have to be 100% correct, that's just analyzing & guesses.

How To Hook State Process: Since OnPacketRecv is a virtual function, its a different function with a different address per state process.

The main place where OnPacketRecv is called should be at:

00BA8FB1 | FF D0                  | call eax                                         | OnPacketRecv

So basically, you can set a breakpoint there in different state processes & get the address of the function.

For example, I want the address of CPSTitle::OnPacketRecv, so I set a breakpoint on that address above during login section, when the breakpoint hits, get the value of EAX, thats your function address.

I made an example as for CPSMission, which handles msgs after selecting your character.

replaceAddr(0x00DD440C, addr_from_this(&CPSMission::OnPacketRecv));

And that's all.

Note: If you're planning to use ReadStringA or ReadStringW functions, you need to ensure you're using VC80 compiler, AKA Visual Studio 2005.

Special thanks to: florian0

I have included it in sro_dev but it shows nothing
Can you guide how to help it work. I really need it

[Laag#82]

Originally Posted by thaidu0ngpr0

I have included it in sro_dev but it shows nothing
Can you guide how to help it work. I really need it

hello again

this can help you

[#HB]

Modification:-
-Fixed few bugs with string functions at CMsgStreamBuffer and updated code to be more readable.

Originally Posted by thaidu0ngpr0

I have included it in sro_dev but it shows nothing
Can you guide how to help it work. I really need it

What do you mean it shows nothing?

[thaidu0ngpr0]

Originally Posted by #HB

Modification:-
-Fixed few bugs with string functions at CMsgStreamBuffer and updated code to be more readable.



What do you mean it shows nothing?

How can I combine it with sro_devkit

[#HB]

Originally Posted by thaidu0ngpr0

How can I combine it with sro_devkit

You can't combine it, DevKit has its own CMsgStreamBuffer just with different labels and maybe better parse.

You can use both already by renaming the class.

[thaidu0ngpr0]

Originally Posted by #HB

You can't combine it, DevKit has its own CMsgStreamBuffer just with different labels and maybe better parse.

You can use both already by renaming the class.

I tried, but it didn't work, I tried calling GUI with opcode 0xB070 but GUI didn't appear
I need to do something else for it to work
CPSMission.cpp

PHP Code:

#include "CPSMission.h"
#include "ClientNet/MsgStreamBuffer.h"
#include "GInterface.h"





int CPSMission::OnPacketRecv(CMsgStreamBuffer* MsgBuffer)
{
    if (MsgBuffer->msgid() == 0xB070)//Show Form
    {
        int FormID = 5004;
        byte ShowHide = -1;
        *MsgBuffer >> FormID >> ShowHide;

        if (FormID != 0 )
        {
            g_pCGInterface->m_IRM.GetResObj(FormID, 1)->ShowGWnd(true);
        }

        MsgBuffer->FlushRemaining();
    }
    //Returning 1 means packet is accepted & read, 0 means fail & afair client may crash if you do return 0
    //Also, if you're planning to read original packets, set TotalReadBytes to 0 after you finish reading, because sro_client will re-read this stuff and if any byte were read before, it'll crash because it attempts to read over max bytes limit.
    return reinterpret_cast<int(__thiscall*)(CPSMission*, CMsgStreamBuffer*)>(0x0084CAB0)(this, MsgBuffer);
} 


[#HB]

Are you sure you're hooking?

[thaidu0ngpr0]

Originally Posted by #HB

Are you sure you're hooking?

florian0 he told me to need a vftable hook. but I don't know where to get the vftable hook. Can you guide me to hook it.
thank you for sharing
my discord : Thaidu0ngpr0#3327

[#HB]

Originally Posted by thaidu0ngpr0

Can you guide me to hook it.

Did you read main post? :3

[thaidu0ngpr0]

Originally Posted by #HB

Did you read main post? :3

thank you very much . I did it

[#HB]

.

Originally Posted by #HB

How To Hook State Process: Since OnPacketRecv is a virtual function, its a different function with a different address per state process.

The main place where OnPacketRecv is called should be at:

00BA8FB1 | FF D0                  | call eax                                         | OnPacketRecv

So basically, you can set a breakpoint there in different state processes & get the address of the function.

For example, I want the address of CPSTitle::OnPacketRecv, so I set a breakpoint on that address above during login section, when the breakpoint hits, get the value of EAX, thats your function address.

CPSMission example:

replaceAddr(0x00DD440C, addr_from_this(&CPSMission::OnPacketRecv));

[d4rk123]

Originally Posted by #HB

Hey there,

I've been hella busy lately, some guy asked me about handling messages in client-side like a week ago, I told 'em I'll make a guide and I totally got busy & forgot.

Anyways, lets get into this.




Note: Structures don't really have to be 100% correct, that's just analyzing & guesses.

How To Hook State Process: Since OnPacketRecv is a virtual function, its a different function with a different address per state process.

The main place where OnPacketRecv is called should be at:

00BA8FB1 | FF D0                  | call eax                                         | OnPacketRecv

So basically, you can set a breakpoint there in different state processes & get the address of the function.

For example, I want the address of CPSTitle::OnPacketRecv, so I set a breakpoint on that address above during login section, when the breakpoint hits, get the value of EAX, thats your function address.

I made an example as for CPSMission, which handles msgs after selecting your character.

replaceAddr(0x00DD440C, addr_from_this(&CPSMission::OnPacketRecv));

And that's all.

Note: If you're planning to use ReadStringA or ReadStringW functions, you need to ensure you're using VC80 compiler, AKA Visual Studio 2005.

Special thanks to: florian0

Linkleri yenilermisiniz? sayfalar açılmıyor

[florian0]

Originally Posted by d4rk123

Linkleri yenilermisiniz? sayfalar açılmıyor

Links are fine

[d4rk123]

Originally Posted by florian0

Links are fine

opened thanks to vpn. thank you

[kotsh23]

Originally Posted by sarkoplata

you can hook: 0x008418D0
the first arg pushed into the stack is a CMsgStreamBuffer*.

Please boss add my discord i need your help
Kotsh#5187