565 lines
15 KiB
C#
565 lines
15 KiB
C#
using System;
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using System.Collections.Concurrent;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Configuration;
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using System.Globalization;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.ServiceProcess;
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using System.Text;
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using System.Text.RegularExpressions;
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using System.Threading;
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using Newtonsoft.Json.Linq;
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namespace smtpproxy.net;
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public class SMTPProxy : ServiceBase
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{
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private ConcurrentQueue<Email> EmailQueue;
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private ManualResetEvent mre;
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private bool bRunning;
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private Thread Sending;
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private Thread Listening;
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private long ThreadCount;
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private bool ConsoleMode;
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private static readonly object _syncObject = new object();
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private IContainer components;
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public SMTPProxy()
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{
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InitializeComponent();
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base.ServiceName = "SMTPProxy.net";
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ConsoleMode = false;
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EmailQueue = new ConcurrentQueue<Email>();
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mre = new ManualResetEvent(initialState: false);
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bRunning = true;
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ThreadCount = 0L;
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}
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protected override void OnStart(string[] args)
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{
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Listening = new Thread(StartListening);
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Listening.Start();
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Sending = new Thread(StartSending);
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Sending.Start();
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}
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public void Start()
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{
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ConsoleMode = true;
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Listening = new Thread(StartListening);
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Listening.Start();
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Sending = new Thread(StartSending);
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Sending.Start();
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}
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protected override void OnStop()
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{
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bRunning = false;
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mre.Set();
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}
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public void Reload(string Folder)
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{
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foreach (string item in Directory.EnumerateFiles(Folder, "*.eml").ToList())
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{
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Email email = new Email();
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email.sDATA = File.ReadAllText(item);
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email.sHELO = File.ReadAllText(item.Replace(".eml", ".HELO"));
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email.sMAIL = File.ReadAllText(item.Replace(".eml", ".MAIL"));
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foreach (string item2 in File.ReadAllLines(item.Replace(".eml", ".RCPTS")).ToList())
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{
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if (item2.Length > 0)
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{
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email.sRCPTs.Add(item2 + "\r\n");
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}
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}
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email.FromIP = "127.0.0.1";
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EmailQueue.Enqueue(email);
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}
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SendQueuedEmails();
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}
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public void StartSending()
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{
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while (!mre.WaitOne(30000) && bRunning)
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{
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SendQueuedEmails();
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}
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}
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public void StartListening()
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{
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Dns.GetHostEntry(Dns.GetHostName());
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IPAddress iPAddress = IPAddress.Parse(ConfigurationManager.AppSettings["ListeningAddress"]);
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IPEndPoint localEP = new IPEndPoint(iPAddress, 25);
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Socket socket = new Socket(iPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
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Log("Started Listening on port 25 at " + iPAddress.ToString());
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socket.Bind(localEP);
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socket.Listen(100);
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while (true)
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{
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try
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{
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Socket socket2 = socket.Accept();
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if (socket2.Connected)
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{
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Log("New Connection:" + DateTime.Now.ToString("G", CultureInfo.CreateSpecificCulture("en-AU")));
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ThreadPool.QueueUserWorkItem(ProcessMailClient, socket2);
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}
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}
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catch (SocketException ex)
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{
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Log($"SocketException : {ex.ToString()}");
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}
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catch (Exception ex2)
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{
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Log($"Unexpected exception : {ex2.ToString()}");
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}
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}
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}
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private void ProcessMailClient(object stateinfo)
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{
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Socket socket = (Socket)stateinfo;
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socket.ReceiveTimeout = 180000;
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socket.SendTimeout = 180000;
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byte[] bytes = Encoding.ASCII.GetBytes("220 Connected to SBC SMTPProxy.net\r\n");
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socket.Send(bytes);
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IPEndPoint iPEndPoint = socket.RemoteEndPoint as IPEndPoint;
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string text = ConfigurationManager.AppSettings["LogFolder"] + "in";
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Directory.CreateDirectory(text);
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string logFileName = $"{text}\\{Guid.NewGuid()}_{iPEndPoint.Address}.log";
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Log("New Client Connected from " + iPEndPoint.Address, logFileName);
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new List<Email>();
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List<string> list = new List<string>();
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byte[] array = new byte[2000];
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StringBuilder stringBuilder = new StringBuilder();
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string text2 = "";
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string text3 = "";
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string text4 = "";
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string text5 = "";
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string text6 = "";
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int num = 0;
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bool flag = false;
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do
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{
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try
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{
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num = socket.Receive(array, 1999, SocketFlags.None);
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if (num > 0)
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{
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array[num] = 0;
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string text7 = Encoding.Default.GetString(array, 0, num);
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text3 = text2 + text7;
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text2 = text7;
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stringBuilder.Append(text7);
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if (num == 1999 || !text3.Contains("\r\n"))
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{
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continue;
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}
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string text8 = stringBuilder.ToString();
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string text9 = ((text8.Length < 4) ? text8 : text8.Substring(0, 4));
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string text10 = "500 Invalid Command\r\n";
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bool flag2 = false;
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if (flag)
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{
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text6 += text8;
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if (text8 == ".\r\n" || text8.Contains("\r\n.\r\n"))
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{
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flag = false;
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text10 = "250 OK\r\n";
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Email email = new Email();
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email.sHELO = text4;
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email.sMAIL = text5;
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email.sRCPTs = new List<string>(list);
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email.sDATA = text6;
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email.FromIP = iPEndPoint.Address.ToString();
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EmailQueue.Enqueue(email);
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text5 = (text6 = "");
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list.Clear();
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}
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}
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else
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{
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switch (text9)
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{
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case "HELO":
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case "EHLO":
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text4 = stringBuilder.ToString();
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text10 = "250 Hi\r\n";
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break;
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case "MAIL":
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if (text4.Length == 0)
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{
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text10 = "503 Do HELO first\r\n";
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break;
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}
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if (text5.Length > 0)
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{
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text10 = "503 Already have MAIL\r\n";
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break;
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}
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text5 = stringBuilder.ToString();
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text10 = "250 MAIL command recorded\r\n";
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break;
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case "RCPT":
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if (text4.Length == 0)
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{
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text10 = "503 Do HELO first\r\n";
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break;
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}
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if (text5.Length == 0)
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{
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text10 = "503 Do MAIL first\r\n";
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break;
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}
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list.Add(stringBuilder.ToString());
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text10 = "250 RCPT command recorded\r\n";
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break;
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case "DATA":
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if (text4.Length == 0)
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{
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text10 = "503 Do HELO first\r\n";
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}
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else if (text5.Length == 0)
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{
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text10 = "503 Do MAIL first\r\n";
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}
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else if (list.Count == 0)
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{
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text10 = "503 Do RCPT first\r\n";
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}
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text10 = "354 DATA\r\n";
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flag2 = true;
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break;
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case "RSET":
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text10 = "250 OK\r\n";
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text5 = (text6 = "");
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list.Clear();
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break;
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case "QUIT":
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socket.Shutdown(SocketShutdown.Both);
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socket.Close();
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num = 0;
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goto end_IL_00ed;
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default:
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Log("Unknown:" + text9, logFileName);
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break;
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}
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}
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if (!flag)
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{
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byte[] bytes2 = Encoding.ASCII.GetBytes(text10);
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socket.Send(bytes2);
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Log(text10, logFileName);
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}
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if (flag2)
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{
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flag = true;
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}
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stringBuilder.Clear();
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array[0] = 0;
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continue;
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}
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if (num == 0)
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{
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Log("Client disconnected.", logFileName);
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continue;
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}
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Log("Client reset the connection.", logFileName);
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socket.Shutdown(SocketShutdown.Both);
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socket.Close();
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num = 0;
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end_IL_00ed:;
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}
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catch (SocketException ex)
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{
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Log($"SocketException : {ex.ToString()}", logFileName);
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num = 0;
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}
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catch (Exception ex2)
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{
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Log($"Unexpected exception : {ex2.ToString()}", logFileName);
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num = 0;
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}
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}
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while (socket.Connected && num > 0);
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if (EmailQueue.Count > 5 && Interlocked.Read(ref ThreadCount) < Convert.ToUInt32(ConfigurationManager.AppSettings["ThreadMax"]))
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{
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Interlocked.Increment(ref ThreadCount);
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SendQueuedEmails();
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Interlocked.Decrement(ref ThreadCount);
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}
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}
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private void Log(string info, string LogFileName = null)
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{
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if (ConsoleMode)
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{
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Console.WriteLine(info.Replace("\r\n", ""));
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}
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if (!string.IsNullOrEmpty(LogFileName))
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{
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using (StreamWriter streamWriter = File.AppendText(LogFileName))
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{
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streamWriter.WriteLine("{0}", info);
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streamWriter.Flush();
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return;
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}
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}
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lock (_syncObject)
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{
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DateTime now = DateTime.Now;
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using StreamWriter streamWriter2 = File.AppendText(string.Format("{0}\\{1:00}{2:00}{3:00}.log", ConfigurationManager.AppSettings["LogFolder"] + "in", now.Year, now.Month, now.Day));
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streamWriter2.WriteLine("{0}", info);
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streamWriter2.Flush();
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}
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}
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private void SendQueuedEmails()
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{
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JToken val2 = default(JToken);
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while (!EmailQueue.IsEmpty)
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{
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if (!EmailQueue.TryDequeue(out var result))
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{
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continue;
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}
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string sMAIL = result.sMAIL;
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sMAIL = sMAIL.Replace(" ", "");
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sMAIL = sMAIL.Replace("MAILFROM:", "");
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sMAIL = sMAIL.Replace("<", "");
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sMAIL = sMAIL.Replace(">", "");
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sMAIL = sMAIL.Replace("\r", "");
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sMAIL = sMAIL.Replace("\n", "");
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string path = ConfigurationManager.AppSettings["Profiles"] + result.FromIP + "\\" + sMAIL + ".json";
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if (!File.Exists(path))
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{
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int num = sMAIL.IndexOf('@');
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string text = sMAIL.Substring(num + 1);
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path = ConfigurationManager.AppSettings["Profiles"] + result.FromIP + "\\default@" + text + ".json";
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if (!File.Exists(path))
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{
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path = ConfigurationManager.AppSettings["Profiles"] + result.FromIP + "\\default.json";
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}
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}
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JObject val;
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try
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{
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val = JObject.Parse(File.ReadAllText(path));
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}
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catch (Exception ex)
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{
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Log(ex.Message);
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continue;
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}
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int num2 = Convert.ToInt32(val["logging"][(object)"enabled"]);
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bool bHideRecipients = Convert.ToInt32(val["HideRecipients"]) == 1;
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bool num3 = num2 == 1;
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string text2 = "";
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string text3 = ((object)val["logging"][(object)"path"]).ToString() + "\\log";
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Directory.CreateDirectory(text3);
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Guid guid = Guid.NewGuid();
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string recipientEmail = result.GetRecipientEmail(result.sRCPTs[0]);
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text2 = $"{text3}\\{recipientEmail}.{guid}.log";
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string text4 = ((object)val["logging"][(object)"path"]).ToString() + "\\out";
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Directory.CreateDirectory(text4);
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if (num3)
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{
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File.WriteAllText($"{text4}\\{recipientEmail}.{guid}.eml", result.sDATA);
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File.WriteAllText($"{text4}\\{recipientEmail}.{guid}.HELO", result.sHELO);
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File.WriteAllText($"{text4}\\{recipientEmail}.{guid}.MAIL", result.sMAIL);
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File.WriteAllLines($"{text4}\\{recipientEmail}.{guid}.RCPTS", result.sRCPTs);
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}
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IPAddress iPAddress = Dns.GetHostEntry(((object)val["smtpserver"]).ToString()).AddressList[0];
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IPEndPoint remoteEP = new IPEndPoint(iPAddress, Convert.ToInt32(((object)val["smtpserverport"]).ToString()));
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int num4 = Convert.ToInt32(val["recipientreplacement"][(object)"enabled"]);
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List<string> list = val["recipientreplacement"][(object)"replacements"].ToObject<List<string>>();
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int num5 = Convert.ToInt32(val["recipientfilter"][(object)"enabled"]);
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List<string> list2 = val["recipientfilter"][(object)"whitelist"].ToObject<List<string>>();
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bool flag = false;
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List<string> list3 = null;
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if (val.TryGetValue("bcc", ref val2))
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{
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flag = Extensions.Value<int>((IEnumerable<JToken>)val2[(object)"enabled"]) == 1;
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list3 = val2[(object)"recipients"].ToObject<List<string>>();
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}
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Socket socket = null;
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bool flag2 = num4 == 1;
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bool flag3 = num5 == 1;
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try
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{
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socket = new Socket(iPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
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socket.Connect(remoteEP);
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if (!CheckAndSend("220", result.sHELO, socket, text2) || !CheckAndSend("250", result.sMAIL, socket, text2))
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{
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continue;
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}
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if (flag2)
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{
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foreach (string item in list)
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{
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string nextCommand = $"RCPT TO: {item}\r\n";
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CheckAndSend("250", nextCommand, socket, text2);
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}
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goto IL_053d;
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}
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int num6 = 0;
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foreach (string sRCPT in result.sRCPTs)
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{
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if (sRCPT.Length < 8)
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{
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continue;
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}
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if (flag3)
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{
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string r = result.GetRecipientEmail(sRCPT);
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if (!list2.Exists((string prd) => prd.Equals(r)))
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{
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Log("Filtering Recipient " + r, text2);
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continue;
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}
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Log("Recipient " + r + " OK", text2);
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}
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if (CheckAndSend("250", sRCPT, socket, text2))
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{
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num6++;
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}
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}
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if (num6 != 0)
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{
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goto IL_053d;
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}
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Log("No Valid recipients, aborting", text2);
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socket.Shutdown(SocketShutdown.Both);
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socket.Close();
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goto end_IL_03a8;
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IL_053d:
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if (flag)
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{
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foreach (string item2 in list3)
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{
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string nextCommand2 = $"RCPT TO: {item2}\r\n";
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CheckAndSend("250", nextCommand2, socket, text2);
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}
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}
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if (CheckAndSend("250", "DATA\r\n", socket, text2) && CheckAndSend("354", CleanseDataBlock(result.sDATA, bHideRecipients), socket, text2) && CheckAndSend("250", "RSET\r\n", socket, text2) && CheckAndSend("250", "QUIT\r\n", socket, text2))
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{
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socket.Shutdown(SocketShutdown.Both);
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socket.Close();
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}
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end_IL_03a8:;
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}
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catch (ArgumentNullException ex2)
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{
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Log($"ArgumentNullException : {ex2.ToString()}", text2);
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}
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catch (SocketException ex3)
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{
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Log($"SocketException : {ex3.ToString()}", text2);
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}
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catch (Exception ex4)
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{
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Log($"Unexpected exception : {ex4.ToString()}", text2);
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}
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}
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}
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private static string CleanseDataBlock(string sData, bool bHideRecipients)
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{
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if (bHideRecipients)
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{
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StringBuilder stringBuilder = new StringBuilder();
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using StringReader stringReader = new StringReader(sData);
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string pattern = "^[Tt][Oo]: *$";
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string pattern2 = "^[Dd][Aa][Tt][Ee]:.*$";
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bool flag = false;
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bool flag2 = false;
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for (string text = stringReader.ReadLine(); text != null; text = stringReader.ReadLine())
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{
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if (flag2)
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{
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stringBuilder.Append(text + "\r\n");
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}
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else if (!flag)
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{
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if (Regex.Match(text, pattern).Success)
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{
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flag = true;
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}
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stringBuilder.Append(text + "\r\n");
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}
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else if (Regex.Match(text, pattern2).Success)
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{
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flag = false;
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stringBuilder.Append(text + "\r\n");
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flag2 = true;
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}
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}
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return stringBuilder.ToString();
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}
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return sData;
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}
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private bool CheckAndSend(string PrevSuccessCode, string NextCommand, Socket sock, string LogFileName)
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{
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byte[] array = new byte[2500];
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string text = "";
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int num = sock.Receive(array);
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if (num <= 0)
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{
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Log("recv failed", LogFileName);
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sock.Shutdown(SocketShutdown.Both);
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sock.Close();
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return false;
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}
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array[num] = 0;
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text = Encoding.ASCII.GetString(array, 0, num);
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Log(text, LogFileName);
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if (text.Substring(0, 3) != PrevSuccessCode)
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{
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sock.Shutdown(SocketShutdown.Both);
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sock.Close();
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return false;
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}
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if (NextCommand.Length > 500)
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{
|
|
Log(NextCommand.Substring(0, 500), LogFileName);
|
|
}
|
|
else
|
|
{
|
|
Log(NextCommand, LogFileName);
|
|
}
|
|
byte[] bytes = Encoding.ASCII.GetBytes(NextCommand);
|
|
sock.Send(bytes);
|
|
return true;
|
|
}
|
|
|
|
protected override void Dispose(bool disposing)
|
|
{
|
|
if (disposing && components != null)
|
|
{
|
|
components.Dispose();
|
|
}
|
|
base.Dispose(disposing);
|
|
}
|
|
|
|
private void InitializeComponent()
|
|
{
|
|
components = new Container();
|
|
base.ServiceName = "Service1";
|
|
}
|
|
}
|