Remove command invocations of "dig"

[gigi.git] / src / org / cacert / gigi / email / EmailProvider.java

diff --git a/src/org/cacert/gigi/email/EmailProvider.java b/src/org/cacert/gigi/email/EmailProvider.java
index 1f232490eddbdbdc40cc980c3a82e1064bd22fc4..8e1881332101ae4bb5630d71a8c05115f23f9e8b 100644 (file)
--- a/src/org/cacert/gigi/email/EmailProvider.java
+++ b/src/org/cacert/gigi/email/EmailProvider.java
@@ -1,13 +1,144 @@
 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.security.GeneralSecurityException;
+import java.security.Key;
+import java.security.PrivateKey;
+import java.security.cert.Certificate;
+import java.security.cert.X509Certificate;
+import java.sql.PreparedStatement;
+import java.sql.SQLException;
+import java.util.Properties;
+import java.util.regex.Pattern;
+
+import javax.naming.NamingException;
+
+import org.cacert.gigi.crypto.SMIME;
+import org.cacert.gigi.database.DatabaseConnection;
+import org.cacert.gigi.util.DNSUtil;
 
 public abstract class EmailProvider {
-       public abstract void sendmail(String to, String subject, String message,
-                       String from, String replyto, String toname, String fromname,
-                       String errorsto, boolean extra) throws IOException;
-       private static EmailProvider instance;
-       public static EmailProvider getInstance() {
-               return instance;
-       }
+
+    public abstract void sendmail(String to, String subject, String message, String from, String replyto, String toname, String fromname, String errorsto, boolean extra) throws IOException;
+
+    private static EmailProvider instance;
+
+    private X509Certificate c;
+
+    private PrivateKey k;
+
+    protected final void init(Certificate c, Key k) {
+        this.c = (X509Certificate) c;
+        this.k = (PrivateKey) k;
+    }
+
+    protected final void sendSigned(String contents, PrintWriter output) throws IOException, GeneralSecurityException {
+        SMIME.smime(contents, k, c, output);
+    }
+
+    public static EmailProvider getInstance() {
+        return instance;
+    }
+
+    protected static void setInstance(EmailProvider instance) {
+        EmailProvider.instance = instance;
+    }
+
+    public static void initSystem(Properties conf, Certificate cert, Key pk) {
+        try {
+            Class<?> c = Class.forName(conf.getProperty("emailProvider"));
+            EmailProvider ep = (EmailProvider) c.getDeclaredConstructor(Properties.class).newInstance(conf);
+            ep.init(cert, pk);
+            instance = ep;
+        } catch (ReflectiveOperationException e) {
+            e.printStackTrace();
+        }
+    }
+
+    public static final String OK = "OK";
+
+    public static final String FAIL = "FAIL";
+
+    public 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];
+
+            String[] mxhosts;
+            try {
+                mxhosts = DNSUtil.getMXEntries(domain);
+            } catch (NamingException e1) {
+                return "MX lookup for your hostname failed.";
+            }
+
+            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;
+    }
+
 }