[Guide] Handling Client Networking @ Any State Process

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07/28/2020 17:11 thaidu0ngpr0#16

Quote:
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.

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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:
Code:
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.

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Code:
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 :rolleyes:

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

07/28/2020 19:09 Laag#82#17

Quote:

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

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07/28/2020 23:03 #HB#18

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

Quote:

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?

08/02/2020 23:13 thaidu0ngpr0#19

Quote:

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

08/03/2020 02:55 #HB#20

Quote:

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.

08/03/2020 08:09 thaidu0ngpr0#21

Quote:

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);
}

08/03/2020 22:19 #HB#22

Are you sure you're hooking?

08/04/2020 05:46 thaidu0ngpr0#23

Quote:

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

08/04/2020 14:57 #HB#24

Quote:

Originally Posted by thaidu0ngpr0

Can you guide me to hook it.

Did you read main post? :3

08/04/2020 16:24 thaidu0ngpr0#25

Quote:

Originally Posted by #HB

Did you read main post? :3

thank you very much . I did it

08/05/2020 09:06 #HB#26

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

11/13/2020 18:10 d4rk123#27

Quote:
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.

[Only registered and activated users can see links. Click Here To Register...]
[Only registered and activated users can see links. Click Here To Register...]

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:
Code:
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.

[Only registered and activated users can see links. Click Here To Register...]
[Only registered and activated users can see links. Click Here To Register...]
Code:
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 :rolleyes:

Linkleri yenilermisiniz? sayfalar a�ılmıyor

11/13/2020 18:57 florian0#28

Quote:

Originally Posted by d4rk123

Linkleri yenilermisiniz? sayfalar a�ılmıyor

Links are fine

11/14/2020 06:14 d4rk123#29

Quote:

Originally Posted by florian0

Links are fine

opened thanks to vpn. thank you

07/26/2021 19:33 kotsh23#30

Quote:

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

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