-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.regex.Pattern;
-
-import org.cacert.gigi.database.DatabaseConnection;
-
-public class EmailChecker {
- 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\\._-]+)+$");
- private EmailChecker() {
- }
- public static 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;
- }
-
-}