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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2021 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.Threading;
using System.Diagnostics;
using KeePass.Native;
using KeePass.Util;
using KeePassLib.Utility;
namespace KeePass.Util
{
public sealed class ChildProcessesSnapshot
{
private readonly string m_strChildExeName; // May be null
private readonly List<uint> m_lPids;
public ChildProcessesSnapshot(string strChildExeName)
{
m_strChildExeName = (string.IsNullOrEmpty(strChildExeName) ?
string.Empty : GetExeName(strChildExeName));
m_lPids = GetChildPids();
}
private List<uint> GetChildPids()
{
List<uint> lPids = new List<uint>();
if(KeePassLib.Native.NativeLib.IsUnix()) return lPids;
try
{
uint pidThis = (uint)Process.GetCurrentProcess().Id;
uint uEntrySize = (uint)Marshal.SizeOf(typeof(
NativeMethods.PROCESSENTRY32));
if(Marshal.SystemDefaultCharSize >= 2)
{
if(IntPtr.Size == 4)
{
Debug.Assert(uEntrySize ==
NativeMethods.PROCESSENTRY32SizeUni32);
}
else if(IntPtr.Size == 8)
{
Debug.Assert(uEntrySize ==
NativeMethods.PROCESSENTRY32SizeUni64);
}
else { Debug.Assert(false); }
}
IntPtr hSnap = NativeMethods.CreateToolhelp32Snapshot(
NativeMethods.ToolHelpFlags.SnapProcess, 0);
if(NativeMethods.IsInvalidHandleValue(hSnap))
{
Debug.Assert(false);
return lPids;
}
for(int i = 0; i < int.MaxValue; ++i)
{
NativeMethods.PROCESSENTRY32 pe = new NativeMethods.PROCESSENTRY32();
pe.dwSize = uEntrySize;
bool b;
if(i == 0) b = NativeMethods.Process32First(hSnap, ref pe);
else b = NativeMethods.Process32Next(hSnap, ref pe);
if(!b) break;
if(pe.th32ProcessID == pidThis) continue;
if(pe.th32ParentProcessID != pidThis) continue;
if(!string.IsNullOrEmpty(m_strChildExeName))
{
if(pe.szExeFile == null) { Debug.Assert(false); continue; }
string str = GetExeName(pe.szExeFile);
if(!str.Equals(m_strChildExeName, StrUtil.CaseIgnoreCmp))
continue;
}
lPids.Add(pe.th32ProcessID);
}
if(!NativeMethods.CloseHandle(hSnap)) { Debug.Assert(false); }
}
catch(Exception) { Debug.Assert(false); }
return lPids;
}
private static char[] m_vTrimChars = null;
private static string GetExeName(string strPath)
{
if(strPath == null) { Debug.Assert(false); return string.Empty; }
if(m_vTrimChars == null)
m_vTrimChars = new char[] { '\r', '\n', ' ', '\t', '\"', '\'' };
string str = strPath.Trim(m_vTrimChars);
str = UrlUtil.GetFileName(str);
return str;
}
public void TerminateNewChildsAsync(int nDelayMs)
{
List<uint> lPids = GetChildPids();
foreach(uint uPid in lPids)
{
if(m_lPids.IndexOf(uPid) < 0)
{
CpsTermInfo ti = new CpsTermInfo(uPid, m_strChildExeName,
nDelayMs);
ParameterizedThreadStart pts = new ParameterizedThreadStart(
ChildProcessesSnapshot.DelayedTerminatePid);
Thread th = new Thread(pts);
th.Start(ti);
}
}
}
private sealed class CpsTermInfo
{
private readonly uint m_uPid;
public uint ProcessId { get { return m_uPid; } }
private readonly string m_strExeName;
public string ExeName { get { return m_strExeName; } }
private readonly int m_nDelayMs;
public int Delay { get { return m_nDelayMs; } }
public CpsTermInfo(uint uPid, string strExeName, int nDelayMs)
{
m_uPid = uPid;
m_strExeName = strExeName;
m_nDelayMs = nDelayMs;
}
}
private static void DelayedTerminatePid(object oTermInfo)
{
try
{
CpsTermInfo ti = (oTermInfo as CpsTermInfo);
if(ti == null) { Debug.Assert(false); return; }
if(ti.Delay > 0) Thread.Sleep(ti.Delay);
Process p = Process.GetProcessById((int)ti.ProcessId);
if(p == null) { Debug.Assert(false); return; }
// Verify that likely it's indeed the correct process
if(!string.IsNullOrEmpty(ti.ExeName))
{
string str = GetExeName(p.MainModule.FileName);
if(!str.Equals(ti.ExeName, StrUtil.CaseIgnoreCmp))
{
Debug.Assert(false);
return;
}
}
p.Kill();
p.Close();
}
catch(ArgumentException) { } // Not running
catch(Exception) { Debug.Assert(false); }
}
}
}
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