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Optionally clear DNS cache on connectivity changes

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M66B
2024-06-22 07:36:06 +02:00
parent f2502b181e
commit 3783689572
6 changed files with 63 additions and 4 deletions
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16
app/src/main/java/eu/faircode/email/EmailService.java
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@@ -637,8 +637,20 @@ public class EmailService implements AutoCloseable {
// throw new MailConnectException(
// new SocketConnectException("Debug", new IOException("Test"), host, port, 0));
main = DnsHelper.getByName(context, host, dnssec);
EntityLog.log(context, EntityLog.Type.Network, "Main address=" + main);
String key = "dns." + host;
try {
main = DnsHelper.getByName(context, host, dnssec);
EntityLog.log(context, EntityLog.Type.Network, "Main address=" + main);
prefs.edit().putString(key, main.getHostAddress()).apply();
} catch (UnknownHostException ex) {
String last = prefs.getString(key, null);
if (TextUtils.isEmpty(last))
throw ex;
else {
EntityLog.log(context, EntityLog.Type.Network, "Using " + key + "=" + last);
main = DnsHelper.getByName(context, last, dnssec);
}
}
boolean prefer_ip4 = prefs.getBoolean("prefer_ip4", true);
if (prefer_ip4 && main instanceof Inet6Address) {