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/* Copyright (c) 2012-2018 Zeex
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef SUBHOOK_H
#define SUBHOOK_H
#if defined _M_IX86 || defined __i386__
#define SUBHOOK_X86
#define SUBHOOK_BITS 32
#elif defined _M_AMD64 || __amd64__
#define SUBHOOK_X86_64
#define SUBHOOK_BITS 64
#else
#error Unsupported architecture
#endif
#if defined _WIN32 || defined __CYGWIN__
#define SUBHOOK_WINDOWS
#elif defined __linux__
#define SUBHOOK_LINUX
#define SUBHOOK_UNIX
#elif defined __APPLE__
#define SUBHOOK_MACOS
#define SUBHOOK_UNIX
#else
#error Unsupported operating system
#endif
#if !defined SUHOOK_EXTERN
#if defined __cplusplus
#define SUBHOOK_EXTERN extern "C"
#else
#define SUBHOOK_EXTERN extern
#endif
#endif
#if defined SUBHOOK_STATIC
#define SUBHOOK_API
#define SUBHOOK_EXPORT SUBHOOK_EXTERN
#endif
#if !defined SUBHOOK_API
#if defined SUBHOOK_X86
#if defined SUBHOOK_WINDOWS
#define SUBHOOK_API __cdecl
#elif defined SUBHOOK_UNIX
#define SUBHOOK_API __attribute__((cdecl))
#endif
#else
#define SUBHOOK_API
#endif
#endif
#if !defined SUBHOOK_EXPORT
#if defined SUBHOOK_WINDOWS
#if defined SUBHOOK_IMPLEMENTATION
#define SUBHOOK_EXPORT SUBHOOK_EXTERN __declspec(dllexport)
#else
#define SUBHOOK_EXPORT SUBHOOK_EXTERN __declspec(dllimport)
#endif
#elif defined SUBHOOK_UNIX
#if defined SUBHOOK_IMPLEMENTATION
#define SUBHOOK_EXPORT SUBHOOK_EXTERN __attribute__((visibility("default")))
#else
#define SUBHOOK_EXPORT SUBHOOK_EXTERN
#endif
#endif
#endif
typedef enum subhook_flags {
/* Use the 64-bit jump method on x86-64 (requires more space). */
SUBHOOK_64BIT_OFFSET = 1
} subhook_flags_t;
struct subhook_struct;
typedef struct subhook_struct *subhook_t;
SUBHOOK_EXPORT subhook_t SUBHOOK_API subhook_new(void *src,
void *dst,
subhook_flags_t flags);
SUBHOOK_EXPORT void SUBHOOK_API subhook_free(subhook_t hook);
SUBHOOK_EXPORT void *SUBHOOK_API subhook_get_src(subhook_t hook);
SUBHOOK_EXPORT void *SUBHOOK_API subhook_get_dst(subhook_t hook);
SUBHOOK_EXPORT void *SUBHOOK_API subhook_get_trampoline(subhook_t hook);
SUBHOOK_EXPORT int SUBHOOK_API subhook_install(subhook_t hook);
SUBHOOK_EXPORT int SUBHOOK_API subhook_is_installed(subhook_t hook);
SUBHOOK_EXPORT int SUBHOOK_API subhook_remove(subhook_t hook);
/* Reads hook destination address from code.
*
* This is useful when you don't know the address or want to check
* whether src is already hooked.
*/
SUBHOOK_EXPORT void *SUBHOOK_API subhook_read_dst(void *src);
#ifdef __cplusplus
namespace subhook {
enum HookFlags {
HookNoFlags = 0,
HookFlag64BitOffset = SUBHOOK_64BIT_OFFSET
};
inline HookFlags operator|(HookFlags o1, HookFlags o2) {
return static_cast<HookFlags>(
static_cast<unsigned int>(o1) | static_cast<unsigned int>(o2));
}
inline HookFlags operator&(HookFlags o1, HookFlags o2) {
return static_cast<HookFlags>(
static_cast<unsigned int>(o1) & static_cast<unsigned int>(o2));
}
class Hook {
public:
Hook() : hook_(0) {}
Hook(void *src, void *dst, HookFlags flags = HookNoFlags)
: hook_(subhook_new(src, dst, (subhook_flags_t)flags))
{
}
~Hook() {
subhook_remove(hook_);
subhook_free(hook_);
}
void *GetSrc() const { return subhook_get_src(hook_); }
void *GetDst() const { return subhook_get_dst(hook_); }
void *GetTrampoline() const { return subhook_get_trampoline(hook_); }
bool Install() {
return subhook_install(hook_) >= 0;
}
bool Install(void *src,
void *dst,
HookFlags flags = HookNoFlags) {
if (hook_ == 0) {
hook_ = subhook_new(src, dst, (subhook_flags_t)flags);
}
return Install();
}
bool Remove() {
return subhook_remove(hook_) >= 0;
}
bool IsInstalled() const {
return !!subhook_is_installed(hook_);
}
static void *ReadDst(void *src) {
return subhook_read_dst(src);
}
private:
Hook(const Hook &);
void operator=(const Hook &);
private:
subhook_t hook_;
};
class ScopedHookRemove {
public:
ScopedHookRemove(Hook *hook)
: hook_(hook)
, removed_(hook_->Remove())
{
}
~ScopedHookRemove() {
if (removed_) {
hook_->Install();
}
}
private:
ScopedHookRemove(const ScopedHookRemove &);
void operator=(const ScopedHookRemove &);
private:
Hook *hook_;
bool removed_;
};
class ScopedHookInstall {
public:
ScopedHookInstall(Hook *hook)
: hook_(hook)
, installed_(hook_->Install())
{
}
ScopedHookInstall(Hook *hook,
void *src,
void *dst,
HookFlags flags = HookNoFlags)
: hook_(hook)
, installed_(hook_->Install(src, dst, flags))
{
}
~ScopedHookInstall() {
if (installed_) {
hook_->Remove();
}
}
private:
ScopedHookInstall(const ScopedHookInstall &);
void operator=(const ScopedHookInstall &);
private:
Hook *hook_;
bool installed_;
};
} // namespace subhook
#endif /* __cplusplus */
#endif /* SUBHOOK_H */
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