X-Git-Url: https://code.wpia.club/?a=blobdiff_plain;f=src%2Forg%2Fcacert%2Fgigi%2Femail%2FEmailProvider.java;h=644c46218709f6fc8d28e6551c093d1fceae12ec;hb=78c6b04860c66d34be008b6766b83c2f594b9909;hp=b5ac8d5ca88f1b58322e018dd1fb15ab54d0b718;hpb=634b7f75c8fc2ed8799bad74731278fb59198c48;p=gigi.git

diff --git a/src/org/cacert/gigi/email/EmailProvider.java b/src/org/cacert/gigi/email/EmailProvider.java
index b5ac8d5c..644c4621 100644
--- a/src/org/cacert/gigi/email/EmailProvider.java
+++ b/src/org/cacert/gigi/email/EmailProvider.java
@@ -1,7 +1,17 @@
 package org.cacert.gigi.email;
 
+import java.io.BufferedReader;
 import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.LinkedList;
 import java.util.Properties;
+import java.util.regex.Pattern;
+
+import org.cacert.gigi.database.DatabaseConnection;
 
 public abstract class EmailProvider {
 	public abstract void sendmail(String to, String subject, String message,
@@ -20,4 +30,111 @@ public abstract class EmailProvider {
 			e.printStackTrace();
 		}
 	}
+
+	public static final String OK = "OK";
+	public static final String FAIL = "FAIL";
+	private static final Pattern MAIL = Pattern
+			.compile("^([a-zA-Z0-9])+([a-zA-Z0-9\\+\\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\\._-]+)+$");
+
+	public String checkEmailServer(int forUid, String address)
+			throws IOException {
+		if (MAIL.matcher(address).matches()) {
+			String[] parts = address.split("@", 2);
+			String domain = parts[1];
+
+			LinkedList<String> mxhosts = getMxHosts(domain);
+
+			for (String host : mxhosts) {
+				try (Socket s = new Socket(host, 25);
+						BufferedReader br = new BufferedReader(
+								new InputStreamReader(s.getInputStream()));
+						PrintWriter pw = new PrintWriter(s.getOutputStream())) {
+					String line;
+					while ((line = br.readLine()) != null
+							&& line.startsWith("220-")) {
+					}
+					if (line == null || !line.startsWith("220")) {
+						continue;
+					}
+
+					pw.print("HELO www.cacert.org\r\n");
+					pw.flush();
+
+					while ((line = br.readLine()) != null
+							&& line.startsWith("220")) {
+					}
+
+					if (line == null || !line.startsWith("250")) {
+						continue;
+					}
+					pw.print("MAIL FROM: <returns@cacert.org>\r\n");
+					pw.flush();
+
+					line = br.readLine();
+
+					if (line == null || !line.startsWith("250")) {
+						continue;
+					}
+					pw.print("RCPT TO: <" + address + ">\r\n");
+					pw.flush();
+
+					line = br.readLine();
+					pw.print("QUIT\r\n");
+					pw.flush();
+
+					try {
+						PreparedStatement statmt = DatabaseConnection
+								.getInstance()
+								.prepare(
+										"insert into `pinglog` set `when`=NOW(), `email`=?, `result`=?, `uid`=?");
+						statmt.setString(1, address);
+						statmt.setString(2, line);
+						statmt.setInt(3, forUid);
+						statmt.execute();
+					} catch (SQLException e) {
+						e.printStackTrace();
+					}
+
+					if (line == null || !line.startsWith("250")) {
+						return line;
+					} else {
+						return OK;
+					}
+				}
+
+			}
+		}
+		try {
+			PreparedStatement statmt = DatabaseConnection
+					.getInstance()
+					.prepare(
+							"insert into `pinglog` set `when`=NOW(), `email`=?, `result`=?, `uid`=?");
+			statmt.setString(1, address);
+			statmt.setString(2,
+					"Failed to make a connection to the mail server");
+			statmt.setInt(3, forUid);
+			statmt.execute();
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		return FAIL;
+	}
+	private static LinkedList<String> getMxHosts(String domain)
+			throws IOException {
+		LinkedList<String> mxhosts = new LinkedList<String>();
+		Process dig = Runtime.getRuntime().exec(
+				new String[]{"dig", "+short", "MX", domain});
+		try (BufferedReader br = new BufferedReader(new InputStreamReader(
+				dig.getInputStream()))) {
+			String line;
+			while ((line = br.readLine()) != null) {
+				String[] mxparts = line.split(" ", 2);
+				if (mxparts.length != 2) {
+					continue;
+				}
+				mxhosts.add(mxparts[1].substring(0, mxparts[1].length() - 1));
+			}
+		}
+		return mxhosts;
+	}
 }