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Tool Auth Port Changer


Sighed
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This is a Tool for changing the Auth Port in the Engine.dll made by some goldfinch guy i don't quite remember who he is.
Its written in FASM also i provide the source code.

;Lineage 2 authorization port changer, version 1.2b
;Copyleft (?) GoldFinch, 2008
;
;You may freely use, modify and distribute this code.
;
;Compile this file with fasm (http://flatassembler.net)
;===================== SETUPS ===========================
;pattern
virtual
   use32
   ;- begin -
   pushd 2106
   ;- end ---
   load PATTERN dword from $$
end virtual
;================ MACRO DEFINITIONS =====================
;High-level-like imported api calls macro.
;Lite version with procedure calls and string constants with "\n" support.
macro IMPORTS [dll,funclist] {
common	data import
forward dd 0,0,0,rva a#dll, rva v#dll
common	dd 0,0,0,0,0
	end data
forward v#dll: irp func,funclist \{
	    p\#func dd rva a\#func
	    macro func [line*] \\{common
		  match (arglist)tail,line* \\\{ push_r arglist \\\}
		  call [p\#func] \\} \}
	dd 0
forward a#dll db `dll#".dll",0
	irp func,funclist \{a\#func db 0,0,\`func,0\} }
macro push_r [arg] { reverse
      if arg eqtype ""
	 call @f
	 local str
	 str db arg,0
 @@:	 fix_str str,$-str
      else
	 pushd arg
      end if }
macro fix_str pStr,nLen {
      repeat nLen-1
	     load w word from pStr+%-1
	     if w="\n"
		store word 0x0D0A at pStr+%-1
	     end if
      end repeat }
;==============================================
;Some console output macro (print and println)
macro __print text {
      local size,str
      push_r size,0,0
      call @f
      str db text
 @@:  size = $-str
      fix_str str,size
      WriteFile([stdout]) }
macro __printf format,[arglist] {
common	wsprintfA(gMsgBuf,format,arglist)
	local ..argcount
	..argcount=0
forward ..argcount=..argcount+1
common	add esp,8+..argcount*4
	WriteFile([stdout],gMsgBuf,eax,0,0) }
macro print format,[arg] {common
      if arg eq
	 __print format
      else
	 __printf format,arg
      end if }
macro println format,[arglist] {common print format#"\n",arglist}
;********************* PROGPAM CODE **************************************************
format PE console
section 'O_o' code readable executable writeable
IMPORTS KERNEL32, < GetStdHandle,WriteFile,ReadFile,CreateFileA,SetFilePointer,GetLastError,CopyFileA,LoadLibraryA,CloseHandle,\
		    FreeLibrary,DeleteFileA,ExitProcess>,\
	USER32,<wsprintfA>
    entry $
    GetStdHandle(-11) ;STD_OUTPUT_HANDLE
    mov [stdout],eax
    GetStdHandle(-10) ;STD_INPUT_HANDLE
    mov [stdin],eax
    print "L2 authorization port changer version 1.2b\nCopyleft (?) GoldFinch, 2008\n\n"#\
	  "This program changes auth port number in engine.dll\nIt must be placed in lineage2\system folder\n"#\
	  "Enter '1' to proceed or nothing to terminate program: "
    ReadFile([stdin],gMsgBuf,1024,nRead,0)
	cmp byte[gMsgBuf],"1"
	jne exit_err
    ;------------------------------------------------
    ;[1] Analyse file
    print "Opening engine.dll ... "
    CreateFileA("engine.dll",0xC0000000,1,0,3,0,0)
    cmp eax,-1
	jnz open_ok
	GetLastError()
	println "failed with error code = %#x",eax
	jmp exit_err
open_ok:
	mov [hFile],eax
	println "OK"
    ;Get PE header offset
    SetFilePointer([hFile],0x3C,0,0)
    ReadFile([hFile],dwPE,4,nRead,0)
    ;Get entrypoint
    mov eax,[dwPE]
    add eax,0x28
    SetFilePointer([hFile],eax,0,0)
    ReadFile([hFile],Entrypoint,4,nRead,0)
    ;Check if file was patched
    cmp [Entrypoint],4
	jnz not_patched
    ;_______________________________________________
    ;File is already patched
    println "WARNING: File is already patched";
    ;Get port value
    SetFilePointer([hFile],port_value-__patch_data,0,0)
    ReadFile([hFile],port_value,4,nRead,0)
    println "Current port number is %d",[port_value]
    ;Ask new port value
    call InputPortNumber
    ;Write new port value
    SetFilePointer([hFile],port_value-__patch_data,0,0)
    WriteFile([hFile],port_value,4,nWritten,0)
    CloseHandle([hFile])
    ;Exit
    println "Port number was changed.\n\nPress [Enter] to close log."
    ReadFile([stdin],gMsgBuf,1,nRead,0) ;OR die ()
    ExitProcess(0)
    ;_______________________________________________
    ;File is not patched
not_patched:
    ;Make a copy of file to load it
    print "Creating temporary file engine.tmp ... "
    CopyFileA("engine.dll","engine.tmp",0)
	test eax,eax
	jnz copy_ok
	GetLastError()
	println "failed with error code = %#x",eax
	jmp exit_err
copy_ok:
	println "OK"
    ;Load dll
    print "Loading engine.tmp ... "
    LoadLibraryA("engine.tmp")
	test eax,eax
	jnz load_ok
	GetLastError()
	println "failed with error code = %#x",eax
	DeleteFileA("engine.tmp")
	jmp exit_err
load_ok:
	mov [hEngine],eax
	println "OK"
    ;Get image size
    mov eax,[hEngine]
    add eax,[dwPE]
    pushd [eax+0x50] ;SizeOfImage
    popd [SizeOfImage]
    ;Find pattern
    print "Looking for the pattern %#08x ... ",PATTERN
    mov edi,[hEngine]
    mov ecx,[SizeOfImage]
    mov eax,PATTERN
    cld
@@: repne scasb
	test ecx,ecx
	jz @f
	cmp dword[edi-1],eax
	jne @r
	jmp _found
@@:	println "not found. \n   Base=%x, Size=%x",[hEngine],[SizeOfImage]
	jmp exit_err
_found:
    sub edi,[hEngine] ;get rva
    println "OK, found at rva %#x",edi
    add [port_delta],edi
    ;Ask port number
    call InputPortNumber
    ;Change entrypoint
    mov eax,[Entrypoint]
    add [oep_rel],eax
    mov [Entrypoint],4
    mov eax,[dwPE]
    add eax,0x28 ;Entrypoint
    SetFilePointer([hFile],eax,0,0)
    WriteFile([hFile],Entrypoint,4,nWritten,0)
    ;Write patch code
    SetFilePointer([hFile],0,0,0)
    WriteFile([hFile],__patch_data,__patch_size,nWritten,0)
    println "%#x bytes was written.\nEngine.dll was patched with new auth port number.",[nWritten]
    CloseHandle([hFile])
    ;Exit
    println "\nNow this program will be terminated.\nYou can use it to change port number again.\n"#\
	    "Warning: probably, this program will crash now, it's normal for this version.\n\n"#\
	    "Press [Enter] to close log."
    ReadFile([stdin],gMsgBuf,1,nRead,0)
    FreeLibrary([hEngine])
    DeleteFileA("engine.tmp")
    ExitProcess(0)
    ;---------------------------
exit_err:
    println "\nPress [Enter] to close log."
    ReadFile([stdin],gMsgBuf,1,nRead,0)
    ExitProcess(0)
;------------------
InputPortNumber: ;Asking a port number
    print "Input new port number to patch or nothing to abort patching:\n-> "
    ReadFile([stdin],gMsgBuf,10,nRead,0)
    xor eax,eax ;for digits
    xor edx,edx ;for a number
    cld
    mov esi,gMsgBuf
    mov ecx,[nRead]
    sub cl,2 ;strip CR,lF
    jz	exit_err ;lmp if empty line
str2dw_loo:
	lodsb
	imul edx,10
	sub al,"0"
	cmp al,9
	ja exit_err ;jmp if not a number
	add edx,eax
    loop str2dw_loo
    mov [port_value],edx
    ret
;_____________________________________________
;Patch body
align 16
__patch_data:
	   dd "MZ"
	   ;new entrypoint will be here
	   pushd [esp+0x0C] ;copy Dllmain arguments
	   pushd [esp+0x0C]
	   pushd [esp+0x0C]
	   ;call themida "original" entry point
	   db 0xE8 ;"call rel32"
	   ;Relative offset. Must be equal to (OEP RVA) - (ret_addr RVA)
oep_rel:   dd -(ret_addr-__patch_data) ;= negative ret_addr RVA, add (OEP RVA) here
ret_addr:  call __base
__base:    pop edx  ;get __base virtual address, rva=4
	   ;in-memory patch
	   db 0xC7,0x82 ;mov dword[edx+imm32],imm32
	   ;Patch place delta offset. Must be equal to (PortValue RVA) - (__base RVA)
port_delta dd -(__base-__patch_data) ;= negative __base RVA, add (PortValue RVA) here
port_value dd 0 ;rva 0x0C ;write desired port value here
	   ret 0x0C ;return to OS
__patch_size=$-__patch_data
;_____________________________________________
;Uninitialized data. Must be at end of section
dwPE dd ?
Entrypoint dd ?
SizeOfImage dd ?
;---------------
hFile dd ?
hEngine dd ?
;---------------
nRead dd ?
org $-4
nWritten dd ?
stdout dd ?
stdin dd ?
gMsgBuf db 1024 dup (?)

Auth Port Modifier.zip

Edited by Sighed
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Is the TR/Patched.Ren.Gen Trojan

 

 

Why i get that error for virus?
I had used that program also before when i had a server and when the players download the patch for the server with the edited engine.dll alll the time Antivirus Hit Red!!!

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This port changer has been made by Fyyre :)

 

Actually only the base-code\poc is - goldfinch modded it and changed it to be a .exe capable of just permanently changing authport.

Because people asked to have it like that - and fyyre well within his rights told people to mod it themselves when sharing source.

 

So some credit to Goldfinch is deserved.

 

 

 

 

Wonder if the byte signature matches newer clients tho.

Edited by mcbigmac
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Actually only the base-code\poc is - goldfinch modded it and changed it to be a .exe capable of just permanently changing authport.

Because people asked to have it like that - and fyyre well within his rights told people to mod it themselves when sharing source.

 

So some credit to Goldfinch is deserved.

 

 

 

 

Wonder if the byte signature matches newer clients tho.

 

Tested and didn't work. It crahes when trying to start game . H5 and GF client.

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  • 1 year later...
  • 7 months later...

I think this file is incomplete , it needs authport.dll & authport.ini and dll must be added to import table of l2.exe

thats other stuff. This edits directly on engine.dll

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  • 5 months later...
  • 3 months later...

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