WireGuard Android: Cached resolved host

WireGuard Android: Cached resolved host

[Heiko Friedel]

Hi all!

I'm using WireGurad on Android to connect to my home server with a 
dynamic IP address. It can change from time to time.

When I need to reconnect due to achanged IP address, it seems that 
WireGurad is using a cached hostname and not re-resolving it. I have to 
"force stop" the app.

Is there a specific reason for caching the hostname?

It would also be great if WireGurad re-resolves the hostname when the 
handshake (keep alive) has timed out.

Thank you,
Heiko








_______________________________________________
WireGuard mailing list
WireGuard@lists.zx2c4.com
https://lists.zx2c4.com/mailman/listinfo/wireguard

Re: WireGuard Android: Cached resolved host

[Jason A. Donenfeld]

t's mostly this way to prevent DNS lookup failures during the network
connectivity changes, such as turning on and off and on a tunnel
really fast. I agree the current implementation's behavior is
suboptimal though. Probably instead we should invalidate based on the
TTL.

The code in question lives at
app/src/main/java/com/wireguard/config/InetEndpoint.java if you want
to take a stab at fixing it.
_______________________________________________
WireGuard mailing list
WireGuard@lists.zx2c4.com
https://lists.zx2c4.com/mailman/listinfo/wireguard

Re: WireGuard Android: Cached resolved host

[Heiko Friedel]

How fast is turning on and off and on?

AddressCache.java already implements a cache with a fixed TTL of 2 seconds.

A quick fix was to re-resolve with every call to getResolvedEndpoint(). 
I'm testing this for a couple of days without issues.

Am 04.11.2018 um 18:25 schrieb Jason A. Donenfeld:

> It's mostly this way to prevent DNS lookup failures during the network
> connectivity changes, such as turning on and off and on a tunnel
> really fast. I agree the current implementation's behavior is
> suboptimal though. Probably instead we should invalidate based on the
> TTL.
> 
> The code in question lives at
> app/src/main/java/com/wireguard/config/InetEndpoint.java if you want
> to take a stab at fixing it.
_______________________________________________
WireGuard mailing list
WireGuard@lists.zx2c4.com
https://lists.zx2c4.com/mailman/listinfo/wireguard