c\#의 심 스 러 운 파일 스 캔 코드(목마 찾기)(제 인)

using System; 
using System.IO; 
using System.Text.RegularExpressions; 
using System.Threading; 
using System.Windows.Forms; 
using System.Net; 
namespace TrojanScanning 
{ 
public partial class Form1 : Form 
{ 
public Form1() 
{ 
InitializeComponent(); 
} 
delegate void SetTextCallback(string text); 
delegate void SetTextCallback2(bool b); 
delegate void SetTextCallback3(ListViewItem item); 
private string fname, code; 
private Thread thr; 
private string[] sArray; 
private void button1_Click(object sender, EventArgs e) 
{ 
if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) 
{ 
scanpath.Text = folderBrowserDialog1.SelectedPath; 
} 
} 
private void startbtn_Click(object sender, EventArgs e) 
{ 
list.Items.Clear(); 
fname = scanpath.Text; 
thr = new Thread(new ThreadStart(scan)); 
thr.IsBackground = true; 
thr.Start(); 
} 
private void scan(){ 
FileSystemInfo s = GetFileSystemInfo(fname); 
if (s != null) { scanbtn(false); ListFiles(s); scantext("    "); scanbtn(true); } else { MessageBox.Show("          "); } 
} 
public FileSystemInfo GetFileSystemInfo(string path){ 
if (File.Exists(path)) 
return new FileInfo(path); 
else if (Directory.Exists(path)) 
return new DirectoryInfo(path); 
else 
return null; 
} 

private void ListFiles(FileSystemInfo info){ 
if (info.Exists){ 
DirectoryInfo dir = info as DirectoryInfo; 
if (dir == null) return; 
try{ 
FileSystemInfo[] files = dir.GetFileSystemInfos(); 
for (int i = 0; i < files.Length; i++){ 
FileInfo file = files[i] as FileInfo; 
if (file != null && (file.Extension.ToLower() == ".asp" || file.Extension.ToLower() == ".php" || file.Extension.ToLower() == ".aspx" || file.Extension.ToLower() == ".master")) 
{ 
scantext("   " + file.FullName); 
chkfile(file.FullName,file.Length); 
}else{ 
ListFiles(files[i]); 
} 
} 
} 
catch{} 
} 
} 
private void chkfile(string filepath,long filesize) 
{ 
try{ 
if (IsFileInUse(filepath)) { System.Threading.Thread.Sleep(2000); chkfile(filepath,filesize); } 
StreamReader sr = new StreamReader(filepath); 
string content = sr.ReadToEnd(); 
sr.Close(); 
string chkr=chkcontent(content); 
if (chkr!=""){ 
ListViewItem item = new ListViewItem("  "); 
item.SubItems.Add(File.GetLastAccessTime(filepath).ToString()); 
item.SubItems.Add(chkr); 
item.SubItems.Add(filepath); 
item.SubItems.Add((filesize/1024).ToString() + " kb"); 
addtiem(item); 
} 
} 
catch { } 
} 
private string downurl(string url) 
{ 
WebClient client = new WebClient(); 
string result = client.DownloadString(url); 
return result; 
} 
private void addtiem(ListViewItem item) 
{ 
if (this.list.InvokeRequired){ 
SetTextCallback3 d = new SetTextCallback3(addtiem); 
this.Invoke(d, new object[] { item }); 
}else{ 
this.list.Items.Add(item); 
} 
} 
private void scantext(string text) 
{ 
if (this.scanstate.InvokeRequired) 
{ 
SetTextCallback d = new SetTextCallback(scantext); 
this.Invoke(d, new object[] { text }); 
}else{ 
this.scanstate.Text=text; 
} 
} 
private void scanbtn(bool b){ 
if (this.startbtn.InvokeRequired){ 
SetTextCallback2 d = new SetTextCallback2(scanbtn); 
this.Invoke(d, new object[] { b }); 
}else{ 
this.startbtn.Enabled = b; 
this.scanpath.Enabled = b; 
this.button1.Enabled = b; 
} 
} 
private string chkcontent(string content){ 
string returnval = ""; 
content = content.ToLower(); 
foreach (string i in sArray) 
{ 
if (content.IndexOf(i)> -1){ returnval+=i+","; } 
} 
if (returnval != "") { returnval=returnval.Substring(0, returnval.Length - 1); } 
return returnval; 
} 
bool IsFileInUse(string fileName) 
{ 
bool inUse = true; 
if (File.Exists(fileName)) 
{ 
FileStream fs = null; 
try { fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None); inUse = false; } 
catch { } 
finally { if (fs != null)fs.Close(); } 
return inUse; 
} 
else { return false; } 
} 
private void Form1_Load(object sender, EventArgs e) 
{ 
try{ 
code = downurl("http://www.cqeh.com/txt/trojan.txt"); 
sArray = code.ToLower().Split('|'); 
} 
catch (Exception ex) 
{ 
MessageBox.Show("  ：" + ex.Message, "      !", MessageBoxButtons.OK); Application.Exit(); 
} 
} 
private void list_DoubleClick(object sender, EventArgs e) 
{ 
System.Diagnostics.Process.Start("NOTEPAD.EXE", list.SelectedItems[0].SubItems[3].Text); 
} 
} 
}

 
if (file != null && (file.Extension.ToLower() == ".asp" || file.Extension.ToLower() == ".php" || file.Extension.ToLower() == ".aspx" || file.Extension.ToLower() == ".master")) 
{ 
scantext("   " + file.FullName); 
chkfile(file.FullName,file.Length); 

 
if (file != null) 
{ 
string fe=file.Extension.ToLower(); 
if (fe == ".asp" || fe == ".php" || fe == ".aspx" || fe == ".master"){ 
　　scantext("   " + file.FullName); 
　　 chkfile(file.FullName, file.Length); 
　　}