Tutorial How to hook in new LGL Modmenu

Acer2k5

Acer2k5

2/3 Approved Games
Hi new modder & old modder.
In this thread, I will show you how to hook in new LGL Modmenu

First: Get hex code we need to use. Example: ​

// RVA: 0x1113FC8 Offset: 0x1113FC8 VA: 0x1113FC8
public void set_ID(int value) { }

This is Offset we need to mod : 0x1113FC8

We need to know some function

Python: 
# Hook the function named "FunctionExample" with the address "0x123456" in the library "libFileB.so"
HOOK("str", FunctionExample, old_FunctionExample);

# Hook the function named "FunctionExample" with the address "0x123456" in the library "libFileC.so"
HOOK_LIB("libFileC.so", "0x123456", FunctionExample, old_FunctionExample);

# Hook the function named "__SymbolNameExample" with the address "0x123456" in the library "libFileB.so"
HOOKSYM("__SymbolNameExample", FunctionExample, old_FunctionExample);

# Hook the function named "__SymbolNameExample" with the address "0x123456" in the library "libFileB.so" and do not replace the original function
HOOKSYM_NO_ORIG("__SymbolNameExample", FunctionExample);

# Patch the offset "0x20D3A8" in the library "libFileB.so" with the bytes "00 00 A0 E3 1E FF 2F E1"
PATCH_LIB("libFileB.so", "0x20D3A8", "00 00 A0 E3 1E FF 2F E1");

# Restore the original value of the offset "0x20D3A8" in the library "libFileB.so"
RESTORE_LIB("libFileB.so", "0x20D3A8");

# Get the absolute address of the function named "Ally_ID" in the library "targetLibName"
Ally_ID = (void (*)(void *, int)) getAbsoluteAddress(targetLibName, 0x1113FC8);

# Log a message to indicate that the process is complete
LOGI(OBFUSCATE("Done"));

Ahead of the Main.cpp file in LGLModmenu, we found :

C++: 
bool feature1, feature2, featureHookToggle, Health;
int sliderValue = 1, level = 0, Dmg = 1, Defend = 1;
void instanceBtn;

We need to add some code to this, we must pay attention to VOID or INT or BOOL element
IF we need use mod function
Toggle : use BOOL
Slider : use INT
I don't know how to use VOID with anny mod function, but we still have to pay attention
I need to mod my team =< 3 so i use Slider and use INT , here is example:

C++: 
bool feature1, feature2, featureHookToggle, Health;
int sliderValue = 1, level = 0, Ally = 1;
void instanceBtn;

To use slider, lets write code like this or copy and rewrite for your modmenu:

C++: 
void (*old_Ally_ID)(void *instance, int value);
void Ally_ID(void *instance, int value) {
    if (instance != NULL && Ally > 1) {
        return (void) Ally;
    }

    // Move the old_Ally_ID function call here
    old_Ally_ID(instance, value);
}

After you understool Hook functions, you can write code like this:

C++: 
    HOOK("str", Ally_ID, old_Ally_ID);
    HOOK_LIB("libFileB.so", "0x1113FC8", Ally_ID, old_Ally_ID);
    HOOK_NO_ORIG("0x1113FC8", Ally_ID);
    
    RESTORE("0x1113FC8");
    RESTORE_LIB("libFileB.so", "0x1113FC8");
    
    Ally_ID = (void (*)(void *, int)) getAbsoluteAddress(targetLibName, 0x1113FC8);

You need a Offucate, lets write it:

C++: 
OBFUSCATE("SeekBar_Ally Ally_1_3"), // 0 case

You need case too:

C++: 
    switch (featNum) {
        case 0:
            Ally =! Ally
            break;
    }

Congratulation, you had your hook. This code below will show summary of all thread code. Having fun coding =]]

C++: 
//Hook example:

int Ally = 1,

void (*old_Ally_ID)(void *instance, int value);
void Ally_ID(void *instance, int value) {
    if (instance != NULL && Ally > 1) {
        return (void) Ally;
    }

    // Move the old_Ally_ID function call here
    old_Ally_ID(instance, value);
}

    HOOK("str", Ally_ID, old_Ally_ID);
    HOOK_LIB("libFileB.so", "0x1113FC8", Ally_ID, old_Ally_ID);
    HOOK_NO_ORIG("0x1113FC8", Ally_ID);
    
    RESTORE("0x1113FC8");
    RESTORE_LIB("libFileB.so", "0x1113FC8");
    
    Ally_ID = (void (*)(void *, int)) getAbsoluteAddress(targetLibName, 0x1113FC8);
    
    jobjectArray GetFeatureList(JNIEnv *env, jobject context) {
    jobjectArray ret;

    const char *features[] = {
            OBFUSCATE("Category_The Category"), //Not counted
            OBFUSCATE("SeekBar_Ally Ally_1_3"), // 0 case
    
    switch (featNum) {
        case 0:
            Ally =! Ally
            break;
    }
 
Thanks for tutorial :pepe013:

but im still dont understand to use this hook
Code: 
HOOKSYM("__SymbolNameExample", FunctionExample, old_FunctionExample);

HOOKSYM_NO_ORIG("__SymbolNameExample", FunctionExample);

HOOK("str", FunctionExample, old_FunctionExample);
 
tutorial coming for field hooking too ???
Also i have a question :-
suppose im making my player unlimited health which is in "int health" and it's a "Field Offset" and i've used toggle for it. So, i was wondering where should i declare variables at the top ?? in the"int" or the "bool" ??
 
Ex:
// RVA: 0x1113FF8 Offset: 0x1113FF8 VA: 0x1113FF8
public void set_Hp1(int value) { }
You need to use void to call Hp, int to edit HP amount
 
AASIM456 said:
tutorial coming for field hooking too ???
Also i have a question :-
suppose im making my player unlimited health which is in "int health" and it's a "Field Offset" and i've used toggle for it. So, i was wondering where should i declare variables at the top ?? in the"int" or the "bool" ??
Click to expand...
You want me to do the tutorial :pepe019:
 
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