Finding TCP ports used by application

Question

All right, so I\'m extending my company\'s flexlm vendor daemon to be a little bit more revealing to client applications.

I need to be able to find out what port lmg

Answer 1

GetTcpTable2 -- see below

GetTcpTable2 function

The GetTcpTable function retrieves the IPv4 TCP connection table.

This will fill in a MIB_TCPTABLE structure.

typedef struct _MIB_TCPTABLE {
  DWORD      dwNumEntries;
  MIB_TCPROW table[ANY_SIZE];
} MIB_TCPTABLE, *PMIB_TCPTABLE;

And now the MIB_TCPROW

typedef struct _MIB_TCPROW {
  DWORD dwState;
  DWORD dwLocalAddr;
  DWORD dwLocalPort;
  DWORD dwRemoteAddr;
  DWORD dwRemotePort;
} MIB_TCPROW, *PMIB_TCPROW;

IMPORTANT:

You need to use GetTcpTable2 in order to get the corresponding PID associated as well.

typedef struct _MIB_TCPROW2 {
  DWORD                        dwState;
  DWORD                        dwLocalAddr;
  DWORD                        dwLocalPort;
  DWORD                        dwRemoteAddr;
  DWORD                        dwRemotePort;
  DWORD                        dwOwningPid;
  TCP_CONNECTION_OFFLOAD_STATE dwOffloadState;
} MIB_TCPROW2, *PMIB_TCPROW2;

dwOwningPid