132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
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//
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// Yet Another POD-Bot, based on PODBot by Markus Klinge ("CountFloyd").
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// Copyright (c) YaPB Development Team.
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//
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// This software is licensed under the BSD-style license.
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// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
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// https://yapb.ru/license
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//
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#pragma once
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#include <crlib/cr-basic.h>
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#if !defined (CR_WINDOWS)
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# include <sys/mman.h>
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#endif
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CR_NAMESPACE_BEGIN
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class SimpleHook : DenyCopying {
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private:
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enum : uint32 {
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CodeLength = 12
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};
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private:
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bool m_patched;
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uint32 m_pageSize;
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uint32 m_origFunc;
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uint32 m_hookFunc;
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uint8 m_origBytes[CodeLength];
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uint8 m_hookBytes[CodeLength];
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private:
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void setPageSize () {
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#if defined (CR_WINDOWS)
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SYSTEM_INFO sysinfo;
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GetSystemInfo (&sysinfo);
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m_pageSize = sysinfo.dwPageSize;
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#else
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m_pageSize = sysconf (_SC_PAGESIZE);
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#endif
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}
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inline void *align (void *address) {
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return reinterpret_cast <void *> ((reinterpret_cast <long> (address) & ~(m_pageSize - 1)));
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}
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bool unprotect () {
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auto orig = reinterpret_cast <void *> (m_origFunc);
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#if defined (CR_WINDOWS)
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DWORD oldProt;
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FlushInstructionCache (GetCurrentProcess (), orig, m_pageSize);
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return VirtualProtect (orig, m_pageSize, PAGE_EXECUTE_READWRITE, &oldProt);
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#else
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auto aligned = align (orig);
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return !mprotect (aligned, m_pageSize, PROT_READ | PROT_WRITE | PROT_EXEC);
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#endif
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}
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public:
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SimpleHook () : m_patched (false), m_origFunc (0), m_hookFunc (0), m_pageSize (0) {
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setPageSize ();
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}
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~SimpleHook () {
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disable ();
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}
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public:
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bool patch (void *address, void *replacement) {
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uint8 *ptr = reinterpret_cast <uint8 *> (address);
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while (*reinterpret_cast <uint16 *> (ptr) == 0x25ff) {
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ptr = **reinterpret_cast <uint8 * **> ((ptr + 2));
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}
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m_origFunc = reinterpret_cast <uint32> (ptr);
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if (!m_origFunc) {
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return false;
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}
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m_hookFunc = reinterpret_cast <uint32> (replacement);
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m_hookBytes[0] = 0x68;
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m_hookBytes[5] = 0xc3;
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*reinterpret_cast <uint32 *> (&m_hookBytes[1]) = m_hookFunc;
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if (unprotect ()) {
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memcpy (m_origBytes, reinterpret_cast <void *> (m_origFunc), CodeLength);
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return enable ();
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}
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return false;
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}
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bool enable () {
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if (m_patched) {
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return false;
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}
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m_patched = true;
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if (unprotect ()) {
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memcpy (reinterpret_cast <void *> (m_origFunc), m_hookBytes, CodeLength);
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return true;
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}
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return false;
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}
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bool disable () {
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if (!m_patched) {
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return false;
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}
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m_patched = false;
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if (unprotect ()) {
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memcpy (reinterpret_cast <void *> (m_origFunc), m_origBytes, CodeLength);
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return true;
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}
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return false;
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}
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bool enabled () const {
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return m_patched;
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}
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};
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CR_NAMESPACE_END
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