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notify hook removal via pipe - fix hook rewrite bug

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This commit is contained in:
Akash Mozumdar 2018-08-02 17:16:49 -04:00
parent 971e35dc10
commit 11d75c2987
4 changed files with 14 additions and 6 deletions
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1
vnrhook/include/const.h
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@ -82,6 +82,7 @@ enum HostNotificationType {
HOST_NOTIFICATION = -1 // null type
, HOST_NOTIFICATION_TEXT = 0
, HOST_NOTIFICATION_NEWHOOK = 1
, HOST_NOTIFICATION_RMVHOOK = 2
};
// jichi 9/8/2013: The meaning are guessed

1
vnrhook/src/hijack/texthook.cc
View File

@ -725,6 +725,7 @@ int TextHook::ClearHook()
// current_available = this;
currentHook--;
ReleaseMutex(hmMutex);
NotifyHookRemove(hp.address);
return err;
}

1
vnrhook/src/main.h
View File

@ -9,6 +9,7 @@
void ConsoleOutput(LPCSTR text); // jichi 12/25/2013: Used to return length of sent text
void NotifyHookInsert(HookParam hp, LPCSTR name);
void NotifyHookRemove(DWORD addr);
DWORD NewHook(const HookParam &hp, LPCSTR name, DWORD flag = HOOK_ENGINE);
DWORD RemoveHook(DWORD addr);
DWORD SwitchTrigger(DWORD on);

17
vnrhook/src/pipe.cc
View File

@ -69,8 +69,6 @@ DWORD WINAPI PipeManager(LPVOID unused)
break;
case HOST_COMMAND_REMOVE_HOOK:
{
HANDLE hookRemovalEvent = OpenEventW(SYNCHRONIZE | EVENT_MODIFY_STATE, FALSE, ITH_REMOVEHOOK_EVENT);
TextHook *in = hookman;
for (int i = 0; i < currentHook; in++)
{
@ -84,9 +82,6 @@ DWORD WINAPI PipeManager(LPVOID unused)
{
in->ClearHook();
}
SetEvent(hookRemovalEvent);
CloseHandle(hookRemovalEvent);
}
break;
case HOST_COMMAND_DETACH:
@ -111,7 +106,6 @@ void ConsoleOutput(LPCSTR text)
WriteFile(::hookPipe, buffer, strlen(text) + sizeof(DWORD) * 2, &unused, nullptr);
}
// Artikash 7/3/2018: TODO: Finish using this in vnrhost instead of section to deliver hook info
void NotifyHookInsert(HookParam hp, LPCSTR name)
{
BYTE buffer[PIPE_BUFFER_SIZE];
@ -124,4 +118,15 @@ void NotifyHookInsert(HookParam hp, LPCSTR name)
return;
}
void NotifyHookRemove(DWORD addr)
{
BYTE buffer[sizeof(DWORD) * 3];
*(DWORD*)buffer = HOST_NOTIFICATION;
*(DWORD*)(buffer + sizeof(DWORD)) = HOST_NOTIFICATION_RMVHOOK;
*(DWORD*)(buffer + sizeof(DWORD) * 2) = addr;
DWORD unused;
WriteFile(::hookPipe, buffer, sizeof(DWORD) * 3, &unused, nullptr);
return;
}
// EOF