81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
#ifndef HOOK_H
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#define HOOK_H
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#include "forward.h"
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#include "Trampolines.h"
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// This is just a simple container for data so I only have to add 1 extra
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// parameter to calls that get trampolined
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class Hook
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{
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public:
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CVector<Forward *> pre; // pre forwards
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CVector<Forward *> post; // post forwards
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void *func; // original function
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void **vtable; // vtable of the original location
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int entry; // vtable entry of the function
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void *target; // target function being called (the hook)
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int exec; // 1 when this hook is in execution
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int del; // 1 if this hook should be destroyed after exec
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void *tramp; // trampoline for this hook
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char *ent; // ent name that's being hooked
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Hook(void **vtable_, int entry_, void *target_, bool voidcall, int paramcount, char *name) :
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func(NULL), vtable(vtable_), entry(entry_), target(target_), exec(0), del(0), tramp(NULL)
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{
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// original function is vtable[entry]
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// to not make the compiler whine, cast vtable to int **
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int **ivtable=(int **)vtable;
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func=(void *)ivtable[entry];
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// now install a trampoline
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// (int thiscall, int voidcall, int paramcount, void *extraptr)
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tramp=CreateGenericTrampoline(true, voidcall, paramcount, (void*)this, target);
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// Insert into vtable
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#if defined _WIN32
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DWORD OldFlags;
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VirtualProtect(&ivtable[entry],sizeof(int*),PAGE_READWRITE,&OldFlags);
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#elif defined __linux__
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mprotect(&ivtable[entry],sizeof(int*),PROT_READ|PROT_WRITE);
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#endif
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ivtable[entry]=(int*)tramp;
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size_t len=strlen(name);
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ent=new char[len+1];
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snprintf(ent,len+1,"%s",name);
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};
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~Hook()
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{
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// Insert the original function back into the vtable
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int **ivtable=(int **)vtable;
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#if defined _WIN32
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DWORD OldFlags;
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VirtualProtect(&ivtable[entry],sizeof(int*),PAGE_READWRITE,&OldFlags);
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#elif defined __linux__
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mprotect(&ivtable[entry],sizeof(int*),PROT_READ|PROT_WRITE);
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#endif
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ivtable[entry]=(int *)func;
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free(tramp);
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delete[] ent;
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CVector<Forward *>::iterator end=pre.end();
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for (CVector<Forward *>::iterator i=pre.begin();
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i!=end;
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++i)
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{
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delete (*i);
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}
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}
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};
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#endif
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