feat(vpn): split-tunnel torrent traffic through managed WireGuard

In-process userspace WireGuard tunnel (wireguard-go + gVisor netstack) for
the managed-VPN add-on. No root, no OS routing changes: only the embedded
anacrolix/torrent client's peer + tracker traffic is routed through the
tunnel, so the swarm and trackers see the VPN IP, not the user's home IP.
unarr's control plane (API, heartbeats) keeps using the normal net.

- internal/vpn: FetchConfig (GET /api/internal/agent/vpn-config, Bearer auth,
  typed errors for disabled/not_provisioned/slot_on_device) + Up (parse .conf
  → uapi, CreateNetTUN, device Up) + DialContext/ListenPacket adapters.
- engine/torrent.go: when a tunnel is set, wire TrackerDialContext +
  HTTPDialContext + TrackerListenPacket to netstack, DisableUTP, and
  AddDialer(NetworkDialer{tcp, netstack}) for peer conns.
- config: downloads.vpn.enabled flag.
- daemon: bring up the tunnel before the torrent client; non-fatal on
  failure (logs + downloads in the clear); slot_on_device warns the user.
- version bump 0.8.1 → 0.9.0.

Pairs with the web VPN add-on (dormant behind NEXT_PUBLIC_VPN_ENABLED).
Runtime-verified once a VPNResellers trial provides a live endpoint.
This commit is contained in:
Deivid Soto 2026-05-20 23:16:54 +02:00
parent 060a3e48db
commit bf279ca5ad
7 changed files with 393 additions and 1 deletions

6
go.sum
View file

@ -560,6 +560,10 @@ golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8T
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golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 h1:B82qJJgjvYKsXS9jeunTOisW56dUokqW/FOteYJJ/yg=
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golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb h1:whnFRlWMcXI9d+ZbWg+4sHnLp52d5yiIPUxMBSt4X9A=
golang.zx2c4.com/wireguard v0.0.0-20250521234502-f333402bd9cb/go.mod h1:rpwXGsirqLqN2L0JDJQlwOboGHmptD5ZD6T2VmcqhTw=
google.golang.org/api v0.3.1/go.mod h1:6wY9I6uQWHQ8EM57III9mq/AjF+i8G65rmVagqKMtkk=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
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@ -587,6 +591,8 @@ gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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