msb-public
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FairEmail
mirror of https://github.com/M66B/FairEmail.git
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Code Issues Projects Releases Wiki Activity

Added option to specify extra DNS server addresses

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pull/214/head
M66B 6 months ago
parent 12828f983f
commit cc862f6955
4 changed files with 95 additions and 25 deletions
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68
app/src/main/java/eu/faircode/email/DnsHelper.java
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@ -20,6 +20,7 @@ package eu.faircode.email;
*/
import android.content.Context;
import android.content.SharedPreferences;
import android.net.ConnectivityManager;
import android.net.DnsResolver;
import android.net.LinkProperties;
@ -28,6 +29,7 @@ import android.os.Build;
import android.text.TextUtils;
import androidx.annotation.NonNull;
import androidx.preference.PreferenceManager;
import org.minidns.AbstractDnsClient;
import org.minidns.DnsClient;
@ -328,29 +330,6 @@ public class DnsHelper {
}
}
private static List<String> getDnsServers(Context context) {
List<String> result = new ArrayList<>();
result.add(DEFAULT_DNS);
ConnectivityManager cm = Helper.getSystemService(context, ConnectivityManager.class);
if (cm == null)
return result;
Network active = ConnectionHelper.getActiveNetwork(context);
if (active == null)
return result;
LinkProperties props = cm.getLinkProperties(active);
if (props == null)
return result;
List<InetAddress> dns = props.getDnsServers();
for (int i = 0; i < dns.size(); i++)
result.add(i, dns.get(i).getHostAddress());
return result;
}
static InetAddress getByName(Context context, String host) throws UnknownHostException {
return InetAddress.getByName(host);
}
@ -384,6 +363,49 @@ public class DnsHelper {
throw new CertificateException("DANE missing or invalid");
}
private static List<String> getDnsServers(Context context) {
List<String> result = new ArrayList<>();
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
String dns_extra = prefs.getString("dns_extra", null);
if (TextUtils.isEmpty(dns_extra))
return result;
String[] extras = dns_extra.replaceAll("\\s+", "").split(",");
for (String extra : extras)
if (ConnectionHelper.isNumericAddress(extra))
result.add(extra);
else
Log.w("DNS extra invalid=" + extra);
result.addAll(_getDnsServers(context));
return result;
}
private static List<String> _getDnsServers(Context context) {
List<String> result = new ArrayList<>();
result.add(DEFAULT_DNS);
ConnectivityManager cm = Helper.getSystemService(context, ConnectivityManager.class);
if (cm == null)
return result;
Network active = ConnectionHelper.getActiveNetwork(context);
if (active == null)
return result;
LinkProperties props = cm.getLinkProperties(active);
if (props == null)
return result;
List<InetAddress> dns = props.getDnsServers();
for (int i = 0; i < dns.size(); i++)
result.add(i, dns.get(i).getHostAddress());
return result;
}
static void test(Context context) throws UnknownHostException {
test(context, "gmail.com", "ns");
test(context, "gmail.com", "mx");

24
app/src/main/java/eu/faircode/email/FragmentOptionsConnection.java
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@ -94,6 +94,7 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
private SwitchCompat swPreferIp4;
private SwitchCompat swBindSocket;
private SwitchCompat swStandaloneVpn;
private EditText etDns;
private SwitchCompat swTcpKeepAlive;
private SwitchCompat swSslUpdate;
private SwitchCompat swSslHarden;
@ -125,7 +126,7 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
"metered", "download", "download_limited", "roaming", "rlah",
"download_headers", "download_eml", "download_plain",
"require_validated", "require_validated_captive", "vpn_only",
"timeout", "prefer_ip4", "bind_socket", "standalone_vpn", "tcp_keep_alive",
"timeout", "prefer_ip4", "bind_socket", "standalone_vpn", "dns_extra", "tcp_keep_alive",
"ssl_update", "ssl_harden", "ssl_harden_strict", "cert_strict", "cert_transparency", "check_names",
"open_safe", "http_redirect",
"bouncy_castle", "bc_fips"
@ -157,6 +158,7 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
swPreferIp4 = view.findViewById(R.id.swPreferIp4);
swBindSocket = view.findViewById(R.id.swBindSocket);
swStandaloneVpn = view.findViewById(R.id.swStandaloneVpn);
etDns = view.findViewById(R.id.etDns);
swTcpKeepAlive = view.findViewById(R.id.swTcpKeepAlive);
swSslUpdate = view.findViewById(R.id.swSslUpdate);
swSslHarden = view.findViewById(R.id.swSslHarden);
@ -335,6 +337,23 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
}
});
etDns.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
// Do nothing
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
prefs.edit().putString("dns_extra", s.toString()).apply();
}
@Override
public void afterTextChanged(Editable s) {
// Do nothing
}
});
swTcpKeepAlive.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton compoundButton, boolean checked) {
@ -623,6 +642,8 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
if ("timeout".equals(key))
return;
if ("dns_extra".equals(key))
return;
getMainHandler().removeCallbacks(update);
getMainHandler().postDelayed(update, FragmentOptions.DELAY_SETOPTIONS);
@ -714,6 +735,7 @@ public class FragmentOptionsConnection extends FragmentBase implements SharedPre
swPreferIp4.setChecked(prefs.getBoolean("prefer_ip4", true));
swBindSocket.setChecked(prefs.getBoolean("bind_socket", false));
swStandaloneVpn.setChecked(prefs.getBoolean("standalone_vpn", false));
etDns.setText(prefs.getString("dns_extra", null));
swTcpKeepAlive.setChecked(prefs.getBoolean("tcp_keep_alive", false));
swSslUpdate.setChecked(prefs.getBoolean("ssl_update", true));
swSslHarden.setChecked(prefs.getBoolean("ssl_harden", false));

27
app/src/main/res/layout/fragment_options_connection.xml
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@ -423,6 +423,31 @@
app:layout_constraintTop_toBottomOf="@id/swBindSocket"
app:switchPadding="12dp" />
<TextView
android:id="@+id/tvDns"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:layout_marginEnd="48dp"
android:text="@string/title_advanced_dns"
android:textAppearance="@style/TextAppearance.AppCompat.Small"
android:textColor="?android:attr/textColorPrimary"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/swStandaloneVpn" />
<eu.faircode.email.EditTextPlain
android:id="@+id/etDns"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="48dp"
android:imeOptions="actionDone"
android:inputType="text"
android:textAppearance="@style/TextAppearance.AppCompat.Medium"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/tvDns" />
<androidx.appcompat.widget.SwitchCompat
android:id="@+id/swTcpKeepAlive"
android:layout_width="0dp"
@ -432,7 +457,7 @@
android:text="@string/title_advanced_tcp_keep_alive"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/swStandaloneVpn"
app:layout_constraintTop_toBottomOf="@id/etDns"
app:switchPadding="12dp" />
<TextView

1
app/src/main/res/values/strings.xml
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@ -517,6 +517,7 @@
<string name="title_advanced_prefer_ip4">Prefer IPv4 over IPv6</string>
<string name="title_advanced_bind_socket" translatable="false">Bind sockets to the active network</string>
<string name="title_advanced_standalone_vpn" translatable="false">Standalone VPN</string>
<string name="title_advanced_dns">Additional DNS server addresses (comma separated)</string>
<string name="title_advanced_tcp_keep_alive" translatable="false">TCP keep alive</string>
<string name="title_advanced_ssl_update">Use updated SSL provider</string>
<string name="title_advanced_ssl_harden">Harden SSL connections</string>

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