Catfriend1 06dd8ee6d7 fix(pmp, netutil): workaround native code denied to discover gateway ipv4 addr on Android 14+ (#10204) ...

### Purpose

As discussed on the forum:
https://forum.syncthing.net/t/reviving-nat-pmp-in-v2-x-on-android-14/24554

TL;DR
Android 14+ only lets java code get the gateway IPv4 address which is
used in SyncthingNative’s NAT-PMP feature.

So I’ve added the java code to the wrapper, got the router IP address
and feeded it to SyncthingNative by setting the env var
“FALLBACK_NET_GATEWAY_IPV4”.

This revives the NAT feature:

> [Z36WU] INFO: Detected 1 NAT service

### Testing

Local build and test via Android emulator (AVD 15).

2025-07-02 20:40:38 +02:00

..

debug.go

style: gofumpt all the things (#9829)

2024-11-19 11:32:56 +01:00

empty_test.go

all: Update license url to https (ref #3976)

2017-02-09 08:04:16 +01:00

pmp.go

fix(pmp, netutil): workaround native code denied to discover gateway ipv4 addr on Android 14+ (#10204)

2025-07-02 20:40:38 +02:00