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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================//
#include "stdafx.h"
#include "net_view_thread.h"
char* CopyAlloc( const char *pStr )
{
char *pRet = new char[ strlen( pStr ) + 1];
strcpy( pRet, pStr );
return pRet;
}
CNetViewThread::CNetViewThread()
{
m_hThread = NULL;
m_hThreadExitEvent = NULL;
InitializeCriticalSection( &m_ComputerNamesCS );
}
CNetViewThread::~CNetViewThread()
{
Term();
DeleteCriticalSection( &m_ComputerNamesCS );
}
void CNetViewThread::Init()
{
Term();
m_hThreadExitEvent = CreateEvent( NULL, false, false, NULL );
DWORD dwThreadID = 0;
m_hThread = CreateThread(
NULL,
0,
&CNetViewThread::StaticThreadFn,
this,
0,
&dwThreadID );
}
void CNetViewThread::Term()
{
if ( m_hThread )
{
SetEvent( m_hThreadExitEvent );
WaitForSingleObject( m_hThread, INFINITE );
CloseHandle( m_hThread );
m_hThread = NULL;
}
if ( m_hThreadExitEvent )
{
CloseHandle( m_hThreadExitEvent );
m_hThreadExitEvent = NULL;
}
}
void CNetViewThread::GetComputerNames( CUtlVector<char*> &computerNames )
{
EnterCriticalSection( &m_ComputerNamesCS );
computerNames.Purge();
for ( int i=0; i < m_ComputerNames.Count(); i++ )
{
computerNames.AddToTail( CopyAlloc( m_ComputerNames[i] ) );
}
LeaveCriticalSection( &m_ComputerNamesCS );
}
void CNetViewThread::UpdateServicesFromNetView()
{
HANDLE hChildStdoutRd, hChildStdoutWr;
// Set the bInheritHandle flag so pipe handles are inherited.
SECURITY_ATTRIBUTES saAttr;
saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
saAttr.bInheritHandle = TRUE;
saAttr.lpSecurityDescriptor = NULL;
if( CreatePipe( &hChildStdoutRd, &hChildStdoutWr, &saAttr, 0 ) )
{
STARTUPINFO si;
memset(&si, 0, sizeof si);
si.cb = sizeof(si);
si.dwFlags = STARTF_USESTDHANDLES;
si.hStdOutput = hChildStdoutWr;
PROCESS_INFORMATION pi;
if( CreateProcess(
NULL,
"net view",
NULL, // lpProcessAttributes
NULL, // lpThreadAttributes
TRUE, // bInheritHandls
DETACHED_PROCESS, // dwCreationFlags
NULL, // lpEnvironment
NULL, // lpCurrentDirectory
&si, // lpStartupInfo
&pi // lpProcessInformation
) )
{
// read from pipe..
#define BUFFER_SIZE 8192
char buffer[BUFFER_SIZE];
BOOL bDone = FALSE;
CUtlVector<char> totalBuffer;
while(1)
{
DWORD dwCount = 0;
DWORD dwRead = 0;
// read from input handle
PeekNamedPipe(hChildStdoutRd, NULL, NULL, NULL, &dwCount, NULL);
if (dwCount)
{
dwCount = min (dwCount, (DWORD)BUFFER_SIZE - 1);
ReadFile(hChildStdoutRd, buffer, dwCount, &dwRead, NULL);
}
if(dwRead)
{
buffer[dwRead] = 0;
totalBuffer.AddMultipleToTail( dwRead, buffer );
}
// check process termination
else if( WaitForSingleObject( pi.hProcess, 1000 ) != WAIT_TIMEOUT )
{
if ( bDone )
break;
bDone = TRUE; // next time we get it
}
}
// Now parse the output.
totalBuffer.AddToTail( 0 );
ParseComputerNames( totalBuffer.Base() );
}
CloseHandle( hChildStdoutRd );
CloseHandle( hChildStdoutWr );
}
}
void CNetViewThread::ParseComputerNames( const char *pNetViewOutput )
{
EnterCriticalSection( &m_ComputerNamesCS );
m_ComputerNames.PurgeAndDeleteElements();
const char *pCur = pNetViewOutput;
while ( *pCur != 0 )
{
// If we get a \\, then it's a computer name followed by whitespace.
if ( pCur[0] == '\\' && pCur[1] == '\\' )
{
char curComputerName[512];
char *pOutPos = curComputerName;
pCur += 2;
while ( *pCur && !V_isspace( *pCur ) && (pOutPos-curComputerName < 510) )
{
*pOutPos++ = *pCur++;
}
*pOutPos = 0;
m_ComputerNames.AddToTail( CopyAlloc( curComputerName ) );
}
++pCur;
}
LeaveCriticalSection( &m_ComputerNamesCS );
}
DWORD CNetViewThread::ThreadFn()
{
// Update the services list every 30 seconds.
do
{
UpdateServicesFromNetView();
} while ( WaitForSingleObject( m_hThreadExitEvent, 30000 ) != WAIT_OBJECT_0 );
return 0;
}
DWORD CNetViewThread::StaticThreadFn( LPVOID lpParameter )
{
return ((CNetViewThread*)lpParameter)->ThreadFn();
}
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