8.5. DONGLES
.text:00022BE7 push eax ; void *
.text:00022BE8 mov eax, [edi]
.text:00022BEA push eax ; int
.text:00022BEB call _write
.text:00022BF0 add esp, 10h
.text:00022BF3 pop ebx
.text:00022BF4 pop esi
.text:00022BF5 pop edi
.text:00022BF6 mov esp, ebp
.text:00022BF8 pop ebp
.text:00022BF9 retn
.text:00022BFA db 0Eh dup(90h)
.text:00022BFA SSQC endp
Yes, indeed, the program needs to communicate with the driver somehow.
The only place where theSSQC()function is called is thethunk function:
.text:0000DBE8 public SSQ
.text:0000DBE8 SSQ proc near ; CODE XREF: sys_info+A9p
.text:0000DBE8 ; sys_info+CBp ...
.text:0000DBE8
.text:0000DBE8 arg_0 = dword ptr 8
.text:0000DBE8
.text:0000DBE8 push ebp
.text:0000DBE9 mov ebp, esp
.text:0000DBEB mov edx, [ebp+arg_0]
.text:0000DBEE push edx
.text:0000DBEF call SSQC
.text:0000DBF4 add esp, 4
.text:0000DBF7 mov esp, ebp
.text:0000DBF9 pop ebp
.text:0000DBFA retn
.text:0000DBFB SSQ endp
SSQ() can be called from at least 2 functions.
One of these is:
.data:0040169C _51_52_53 dd offset aPressAnyKeyT_0 ; DATA XREF: init_sys+392r
.data:0040169C ; sys_info+A1r
.data:0040169C ; "PRESS ANY KEY TO CONTINUE: "
.data:004016A0 dd offset a51 ; "51"
.data:004016A4 dd offset a52 ; "52"
.data:004016A8 dd offset a53 ; "53"
...
.data:004016B8 _3C_or_3E dd offset a3c ; DATA XREF: sys_info:loc_D67Br
.data:004016B8 ; "3C"
.data:004016BC dd offset a3e ; "3E"
; these names we gave to the labels:
.data:004016C0 answers1 dd 6B05h ; DATA XREF: sys_info+E7r
.data:004016C4 dd 3D87h
.data:004016C8 answers2 dd 3Ch ; DATA XREF: sys_info+F2r
.data:004016CC dd 832h
.data:004016D0 _C_and_B db 0Ch ; DATA XREF: sys_info+BAr
.data:004016D0 ; sys_info:OKr
.data:004016D1 byte_4016D1 db 0Bh ; DATA XREF: sys_info+FDr
.data:004016D2 db 0
...
.text:0000D652 xor eax, eax
.text:0000D654 mov al, ds:ctl_port
.text:0000D659 mov ecx, _51_52_53[eax*4]
.text:0000D660 push ecx
.text:0000D661 call SSQ
.text:0000D666 add esp, 4
.text:0000D669 cmp eax, 0FFFFFFFFh