8.5. DONGLES
The program reports an error without dongle connected, but the error string cannot be found in the exe-
cutables.
Thanks toIDA, it is easy to load the COFF executable used in SCO OpenServer.
Let’s also try to find “rbsl” string and indeed, found it in this code fragment:
.text:00022AB8 public SSQC
.text:00022AB8 SSQC proc near ; CODE XREF: SSQ+7p
.text:00022AB8
.text:00022AB8 var_44 = byte ptr -44h
.text:00022AB8 var_29 = byte ptr -29h
.text:00022AB8 arg_0 = dword ptr 8
.text:00022AB8
.text:00022AB8 push ebp
.text:00022AB9 mov ebp, esp
.text:00022ABB sub esp, 44h
.text:00022ABE push edi
.text:00022ABF mov edi, offset unk_4035D0
.text:00022AC4 push esi
.text:00022AC5 mov esi, [ebp+arg_0]
.text:00022AC8 push ebx
.text:00022AC9 push esi
.text:00022ACA call strlen
.text:00022ACF add esp, 4
.text:00022AD2 cmp eax, 2
.text:00022AD7 jnz loc_22BA4
.text:00022ADD inc esi
.text:00022ADE mov al, [esi-1]
.text:00022AE1 movsx eax, al
.text:00022AE4 cmp eax, '3'
.text:00022AE9 jz loc_22B84
.text:00022AEF cmp eax, '4'
.text:00022AF4 jz loc_22B94
.text:00022AFA cmp eax, '5'
.text:00022AFF jnz short loc_22B6B
.text:00022B01 movsx ebx, byte ptr [esi]
.text:00022B04 sub ebx, '0'
.text:00022B07 mov eax, 7
.text:00022B0C add eax, ebx
.text:00022B0E push eax
.text:00022B0F lea eax, [ebp+var_44]
.text:00022B12 push offset aDevSlD ; "/dev/sl%d"
.text:00022B17 push eax
.text:00022B18 call nl_sprintf
.text:00022B1D push 0 ; int
.text:00022B1F push offset aDevRbsl8 ; char
.text:00022B24 call _access
.text:00022B29 add esp, 14h
.text:00022B2C cmp eax, 0FFFFFFFFh
.text:00022B31 jz short loc_22B48
.text:00022B33 lea eax, [ebx+7]
.text:00022B36 push eax
.text:00022B37 lea eax, [ebp+var_44]
.text:00022B3A push offset aDevRbslD ; "/dev/rbsl%d"
.text:00022B3F push eax
.text:00022B40 call nl_sprintf
.text:00022B45 add esp, 0Ch
.text:00022B48
.text:00022B48 loc_22B48: ; CODE XREF: SSQC+79j
.text:00022B48 mov edx, [edi]
.text:00022B4A test edx, edx
.text:00022B4C jle short loc_22B57
.text:00022B4E push edx ; int
.text:00022B4F call _close
.text:00022B54 add esp, 4
.text:00022B57
.text:00022B57 loc_22B57: ; CODE XREF: SSQC+94j
.text:00022B57 push 2 ; int
.text:00022B59 lea eax, [ebp+var_44]
.text:00022B5C push eax ; char