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It seems like NCSoft has changed their Login Server. 

Running the test_l2_app gives:

root@developer:~/test_l2_app# ./testl2app
Login: trolololol
Pass: tralalala
Socket created...
Connecting... .Connected.
Recv init: rcvd 194 bytes
Warning: Init packet len != 186!
Init parse error!
Login protocol version: 00000000 (0)
Login sessionId: 00 00 00 00
Login protocol version invalid!: Operation now in progress
*** glibc detected *** ./testl2app: free(): invalid pointer: 0x0000000000963bc0 
***
======= Backtrace: =========


I tried to play a little bit around with the code, but couldn't find what has 
changed on their servers...

On this file:
trunk/src/game/AionGamePacket.h

change this:
static const unsigned char STATIC_CLIENT_OPCODE = 0x5D;

to:

static const unsigned char STATIC_CLIENT_OPCODE = 0x57;

This is the newest static client opcode (client 2.1, with 01/26 patch applied).

Cheers,
-V

../src/login/server/L2Login_Init.cpp: In member function ‘virtual bool 
L2Login_Init::create(L2_VERSION)’:
../src/login/server/L2Login_Init.cpp:265: error: expected primary-expression 
before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:265: error: expected ‘)’ before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:266: error: expected primary-expression 
before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:266: error: expected ‘)’ before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:267: error: expected primary-expression 
before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:267: error: expected ‘)’ before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:268: error: expected primary-expression 
before 
‘unsigned’
../src/login/server/L2Login_Init.cpp:268: error: expected ‘)’ before 
‘unsigned’
../src/login/server/L2Login_Init.cpp: At global scope:
../src/login/server/L2Login_Init.cpp:226: warning: unused parameter ‘ver’
../src/login/server/L2Login_Init.cpp:283: warning: unused parameter ‘ver’
make: *** [../build/Release/linux/L2Login_Init.o] Error 1

What steps will reproduce the problem?
For example, L2PNet_ntoa returns invalid byte order

What is the expected output? What do you see instead?
127.0.0.1
1.0.0.127
:)

TODO: test other functions

What steps will reproduce the problem?
1. check out r62
2. cd project_linux
3. make -f Makefile_release

What is the expected output? What do you see instead?

Instead of compiling correctly there are errors.

What version of the product are you using? On what operating system?

r62 Ubuntu Linux i686 GNU/Linux

Please provide any additional information below.

Apply the attached patch for correcting errors.

g++   -c -W -Wall -DSQLITE_THREADSAFE=1 -I../src -I../src/sqlite3
../src/base/L2BasePacket.cpp -o ../build/Release/linux/L2BasePacket.o
../src/base/L2BasePacket.cpp: In member function ‘virtual bool
L2BasePacket::parse(L2_VERSION)’:
../src/base/L2BasePacket.cpp:582: error: ‘UNREFERENCED_PARAMETER’ was not
declared in this scope
../src/base/L2BasePacket.cpp: In member function ‘virtual bool
L2BasePacket::create(L2_VERSION)’:
../src/base/L2BasePacket.cpp:591: error: ‘UNREFERENCED_PARAMETER’ was not
declared in this scope
make: *** [../build/Release/linux/L2BasePacket.o] Ошибка 1

gcc version 4.4.0 (Ubuntu 4.4.0-8ubuntu2)

Because of this, you cannot use library to log in to retail server :)