通用32位apihook函数(hook socket)

typedef int(__stdcall *send_)(SOCKET , const char* , int , int );
typedef int(__stdcall *recv_)(SOCKET, const char*, int, int);
int __stdcall fake_send(SOCKET s, const char* buf, int len, int flags)
{
    return old_send(s, buf, len, flags);
}
int __stdcall fake_recv(SOCKET s, const char* buf, int len, int flags)
{
    int r = old_recv(s, buf, len, flags);
    return r;
}
void* hook_x86(const char* dll,const char* func,void* fake_addr)
{
    HINSTANCE hInst = ::GetModuleHandleA(dll);
    if (hInst == NULL)
        hInst = LoadLibraryA(dll);
    if (hInst == NULL)
        return NULL;
    char* p = (char*)::GetProcAddress(hInst, func);
    void* old = (void*)(p + 1);
    DWORD Old = 0;
    VirtualProtect(p - 10, 20, PAGE_EXECUTE_READWRITE, &Old);
    *p++ = 0xEB;
    *p = 0xF9;
    p -= 6;
    *p = 0xE9;
    DWORD* t = (DWORD*)++p;
    DWORD ta = (DWORD)fake_addr - ((DWORD)t - 1) - 5;
    *t = ta;
    VirtualProtect(p - 10, 20, Old, &Old);
    return old;
}
old_send = (send_)hook_x86("ws2_32.dll", "send", fake_send);
old_recv = (recv_)hook_x86("ws2_32.dll", "recv", fake_recv);