1 /* 2 * gen_uuid_nt.c -- Use NT api to generate uuid 3 * 4 * Written by Andrey Shedel (andreys (at) ns.cr.cyco.com) 5 */ 6 7 8 #include "config.h" 9 #include "uuidP.h" 10 11 #pragma warning(push,4) 12 13 #pragma comment(lib, "ntdll.lib") 14 15 // 16 // Here is a nice example why it's not a good idea 17 // to use native API in ordinary applications. 18 // Number of parameters in function below was changed from 3 to 4 19 // for NT5. 20 // 21 // 22 // NTSYSAPI 23 // NTSTATUS 24 // NTAPI 25 // NtAllocateUuids( 26 // OUT PULONG p1, 27 // OUT PULONG p2, 28 // OUT PULONG p3, 29 // OUT PUCHAR Seed // 6 bytes 30 // ); 31 // 32 // 33 34 unsigned long 35 __stdcall 36 NtAllocateUuids( 37 void* p1, // 8 bytes 38 void* p2, // 4 bytes 39 void* p3 // 4 bytes 40 ); 41 42 typedef 43 unsigned long 44 (__stdcall* 45 NtAllocateUuids_2000)( 46 void* p1, // 8 bytes 47 void* p2, // 4 bytes 48 void* p3, // 4 bytes 49 void* seed // 6 bytes 50 ); 51 52 53 54 // 55 // Nice, but instead of including ntddk.h ot winnt.h 56 // I should define it here because they MISSED __stdcall in those headers. 57 // 58 59 __declspec(dllimport) 60 struct _TEB* 61 __stdcall 62 NtCurrentTeb(void); 63 64 65 // 66 // The only way to get version information from the system is to examine 67 // one stored in PEB. But it's pretty dangerouse because this value could 68 // be altered in image header. 69 // 70 71 static 72 int 73 Nt5(void) 74 { 75 //return NtCuttentTeb()->Peb->OSMajorVersion >= 5; 76 return (int)*(int*)((char*)(int)(*(int*)((char*)NtCurrentTeb() + 0x30)) + 0xA4) >= 5; 77 } 78 79 80 81 82 void uuid_generate(uuid_t out) 83 { 84 if(Nt5()) 85 { 86 unsigned char seed[6]; 87 ((NtAllocateUuids_2000)NtAllocateUuids)(out, ((char*)out)+8, ((char*)out)+12, &seed[0] ); 88 } 89 else 90 { 91 NtAllocateUuids(out, ((char*)out)+8, ((char*)out)+12); 92 } 93 } 94
