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