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/*
* gen_uuid_nt.c -- Use NT api to generate uuid
*
* Written by Andrey Shedel (andreys@ns.cr.cyco.com)
*/
#include "uuidP.h"
#pragma warning(push,4)
#pragma comment(lib, "ntdll.lib")
//
// Here is a nice example why it's not a good idea
// to use native API in ordinary applications.
// Number of parameters in function below was changed from 3 to 4
// for NT5.
//
//
// NTSYSAPI
// NTSTATUS
// NTAPI
// NtAllocateUuids(
// OUT PULONG p1,
// OUT PULONG p2,
// OUT PULONG p3,
// OUT PUCHAR Seed // 6 bytes
// );
//
//
unsigned long
__stdcall
NtAllocateUuids(
void* p1, // 8 bytes
void* p2, // 4 bytes
void* p3 // 4 bytes
);
typedef
unsigned long
(__stdcall*
NtAllocateUuids_2000)(
void* p1, // 8 bytes
void* p2, // 4 bytes
void* p3, // 4 bytes
void* seed // 6 bytes
);
//
// Nice, but instead of including ntddk.h ot winnt.h
// I should define it here because they MISSED __stdcall in those headers.
//
__declspec(dllimport)
struct _TEB*
__stdcall
NtCurrentTeb(void);
//
// The only way to get version information from the system is to examine
// one stored in PEB. But it's pretty dangerouse because this value could
// be altered in image header.
//
static
int
Nt5(void)
{
//return NtCuttentTeb()->Peb->OSMajorVersion >= 5;
return (int)*(int*)((char*)(int)(*(int*)((char*)NtCurrentTeb() + 0x30)) + 0xA4) >= 5;
}
void uuid_generate(uuid_t out)
{
if(Nt5())
{
unsigned char seed[6];
((NtAllocateUuids_2000)NtAllocateUuids)(out, ((char*)out)+8, ((char*)out)+12, &seed[0] );
}
else
{
NtAllocateUuids(out, ((char*)out)+8, ((char*)out)+12);
}
}
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