Background

Trying to compile netcat ( nc ) using minGW.

 

Lineage

1. NetCat – Visual Studio – Source Code Compilation
   Link
2. Netcat on MS Windows – Sample Usage
   Link

Error

Error – Text

undefined reference to `__imp_WSAGetLastError'
undefined reference to `__imp_WSAGetLastError'
undefined reference to `__imp_shutdown'
undefined reference to `__imp_closesocket'
undefined reference to `__imp_inet_addr'
undefined reference to `__imp_gethostbyname'
undefined reference to `__imp_WSAGetLastError'
undefined reference to `__imp_inet_ntoa'
undefined reference to `__imp_gethostbyaddr'
undefined reference to `__imp_WSAGetLastError'
undefined reference to `__imp_inet_ntoa'
undefined reference to `__imp_gethostbyaddr'
undefined reference to `__imp_WSAGetLastError'
undefined reference to `__imp_gethostbyname'
undefined reference to `__imp_WSAGetLastError'
undefined reference to `__imp_htons'
undefined reference to `__imp_getservbyport'
undefined reference to `__imp_ntohs'
undefined reference to `__imp_getservbyname'
undefined reference to `__imp_ntohs'
 undefined reference to `__imp_WSASetLastError'
 undefined reference to `__imp_socket'
 undefined reference to `__imp_socket'
 undefined reference to `__imp_setsockopt'
 undefined reference to `__imp_htons'
 undefined reference to `__imp_bind'
 undefined reference to `__imp_inet_ntoa'
 undefined reference to `__imp_inet_ntoa'
 undefined reference to `__imp_htons'
 undefined reference to `__imp_connect'
 undefined reference to `__imp_WSASetLastError'
 undefined reference to `__imp_WSAGetLastError'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_WSASetLastError'
 undefined reference to `__imp_listen'
 undefined reference to `__imp_getsockname'
 undefined reference to `__imp_inet_ntoa'
 undefined reference to `__imp_ntohs'
 undefined reference to `__imp_recvfrom'
 undefined reference to `__imp_connect'
 undefined reference to `__imp_accept'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_getsockname'
 undefined reference to `__imp_inet_ntoa'
 undefined reference to `__imp_ntohs'
 undefined reference to `__imp_inet_ntoa'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_send'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_send'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_WSASetLastError'
 undefined reference to `__imp_select'
 undefined reference to `__imp_WSAGetLastError'
 undefined reference to `__imp_WSAGetLastError'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_WSASetLastError'
 undefined reference to `__WSAFDIsSet'
 undefined reference to `__imp_recv'
 undefined reference to `__imp_send'
 undefined reference to `__WSAFDIsSet'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_WSAGetLastError'
 undefined reference to `__imp_shutdown'
 undefined reference to `__imp_closesocket'
 undefined reference to `__imp_WSACleanup' 

TroubleShooting

Microsoft

Docs

Docs / Windows / Windows Sockets 2 / Winsock.h / WSAGetLastError function

Link

Image

Textual

1. Header
   • winsock.h ( include Winsock2.h )
2. Library
   • Ws2_32.lib
3. Dll
   • Ws2_32.dll

 

Remediation

Outline

1. Adding ws2_32 to list of libraries referenced during the build

Sample

setlocal

rem dadeniji
rem SET COMPILER=c:\MinGW\bin\gcc.exe

set _compilerFolder=C:\mingw\x86_64\8.1.0\posix\seh\mingw64\bin
set _compilerBinary=gcc.exe
set COMPILER=%_compilerFolder%\%_compilerBinary%

rem dadeniji
rem SET LIB_DIR=c:\MinGW\lib
SET LIB_DIR=C:\mingw\x86_64\8.1.0\posix\seh\mingw64\lib

rem dadeniji
set PATH=%PATH%;%_compilerFolder%

@REM	not needed? SET COMPILE_OPTIONS=-c -DWIN32 -DNDEBUG -D_CONSOLE -DTELNET
SET COMPILE_OPTIONS=-c

if exist *.o del *.o

if exist nc.exe del nc.exe

"%COMPILER%" %COMPILE_OPTIONS% getopt.c

"%COMPILER%" %COMPILE_OPTIONS% doexec.c

"%COMPILER%" %COMPILE_OPTIONS% netcat.c

"%COMPILER%" getopt.o doexec.o netcat.o --output nc.exe -lkernel32 -luser32 -lwinmm -lws2_32

endlocal

Source Code Control

GitHub

Gist

netcat on MS Windows
Link

Summary

When we initially downloaded the source code for netcat on MS Windows, we used Microsoft’s Visual Studio.Net to compile it.

Since then downloaded MinGW and gained some familiarity with that tool, as well.

Thankfully, able to compile against the MinGW tool with small modifications.

 

References

1. Microsoft
   • Docs
     • Docs / Windows / Windows Sockets 2 / Winsock.h / WSAGetLastError function
       Link
2.  StackOverflow
   • undefined reference to `__imp_WSACleanup’
     Link