Netstack (#1403)

Add netstack support for the agent to run it without privileges.

- use interface for tun device
- use common IPC for userspace WireGuard integration
- move udpmux creation and sharedsock to tun layer

go.mod

@@ -57,12 +57,12 @@ require (
 	github.com/patrickmn/go-cache v2.1.0+incompatible
 	github.com/pion/logging v0.2.2
 	github.com/pion/stun/v2 v2.0.0
-	github.com/pion/transport/v2 v2.2.1
 	github.com/pion/transport/v3 v3.0.1
 	github.com/prometheus/client_golang v1.14.0
 	github.com/rs/xid v1.3.0
 	github.com/skratchdot/open-golang v0.0.0-20200116055534-eef842397966
 	github.com/stretchr/testify v1.8.4
+	github.com/things-go/go-socks5 v0.0.4
 	github.com/yusufpapurcu/wmi v1.2.3
 	go.opentelemetry.io/otel v1.11.1
 	go.opentelemetry.io/otel/exporters/prometheus v0.33.0
@@ -110,6 +110,7 @@ require (
 	github.com/go-stack/stack v1.8.0 // indirect
 	github.com/goki/freetype v0.0.0-20181231101311-fa8a33aabaff // indirect
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
+	github.com/google/btree v1.0.1 // indirect
 	github.com/google/s2a-go v0.1.4 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.2.3 // indirect
 	github.com/googleapis/gax-go/v2 v2.10.0 // indirect
@@ -128,6 +129,7 @@ require (
 	github.com/pion/dtls/v2 v2.2.7 // indirect
 	github.com/pion/mdns v0.0.9 // indirect
 	github.com/pion/randutil v0.1.0 // indirect
+	github.com/pion/transport/v2 v2.2.1 // indirect
 	github.com/pion/turn/v3 v3.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/prometheus/client_model v0.3.0 // indirect
@@ -154,6 +156,7 @@ require (
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gvisor.dev/gvisor v0.0.0-20221203005347-703fd9b7fbc0 // indirect
 	honnef.co/go/tools v0.2.2 // indirect
 	k8s.io/apimachinery v0.23.5 // indirect
 )