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Code Issues Releases Wiki Activity

Automatically retry on IPv4

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This commit is contained in:
M66B 2019-07-27 17:59:46 +02:00
parent f661a7c09b
commit 3e58d22dc6
1 changed files with 45 additions and 3 deletions
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48
app/src/main/java/eu/faircode/email/ConnectionHelper.java
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@ -21,6 +21,7 @@ import org.xbill.DNS.Lookup;
import org.xbill.DNS.SimpleResolver;
import org.xbill.DNS.Type;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.Arrays;
@ -37,6 +38,7 @@ import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
public class ConnectionHelper {
private static final String any4 = "0.0.0.0";
// https://dns.watch/
private static final String DEFAULT_DNS = "84.200.69.80";
@ -265,7 +267,22 @@ public class ConnectionHelper {
}
static void connect(Context context, Session isession, IMAPStore istore, String host, int port, String user, String password) throws MessagingException {
istore.connect(host, port, user, password);
try {
istore.connect(host, port, user, password);
} catch (MessagingException ex) {
if (!hasIPv6(host))
throw ex;
try {
Log.i("Binding to " + any4);
isession.getProperties().put("mail.imap.localaddress", any4);
isession.getProperties().put("mail.imaps.localaddress", any4);
istore.connect(host, port, user, password);
} catch (Throwable ex1) {
Log.w(ex1);
throw ex;
}
}
// https://www.ietf.org/rfc/rfc2971.txt
if (istore.hasCapability("ID"))
@ -288,9 +305,34 @@ public class ConnectionHelper {
}
static void connect(Context context, Session isession, Transport itransport, String host, int port, String user, String password) throws MessagingException {
itransport.connect(host, port, user, password);
try {
itransport.connect(host, port, user, password);
} catch (MessagingException ex) {
if (!hasIPv6(host))
throw ex;
try {
Log.i("Binding to " + any4);
isession.getProperties().put("mail.smtp.localaddress", any4);
isession.getProperties().put("mail.smtps.localaddress", any4);
itransport.connect(host, port, user, password);
} catch (Throwable ex1) {
Log.w(ex1);
throw ex;
}
}
}
private static boolean hasIPv6(String host) {
try {
for (InetAddress iaddr : InetAddress.getAllByName(host))
if (iaddr instanceof Inet6Address)
return true;
} catch (UnknownHostException ignored) {
}
return false;
}
static boolean airplaneMode(Context context) {
return Settings.System.getInt(context.getContentResolver(),
Settings.Global.AIRPLANE_MODE_ON, 0) != 0;