platform: modularize api/gui, add docs-tests-web foundation, and refresh root config

selective-vpn-api/app/cli/autoloop.go

@@ -0,0 +1,59 @@
+package cli
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"os"
+)
+
+type AutoloopParams struct {
+	Iface           string
+	Table           string
+	MTU             int
+	StateDir        string
+	DefaultLocation string
+}
+
+type AutoloopDeps struct {
+	StateDirDefault string
+	ResolveIface    func(flagIface string) string
+	Run             func(params AutoloopParams)
+	Stderr          io.Writer
+}
+
+func RunAutoloop(args []string, deps AutoloopDeps) int {
+	if deps.ResolveIface == nil || deps.Run == nil {
+		return 1
+	}
+	stderr := deps.Stderr
+	if stderr == nil {
+		stderr = os.Stderr
+	}
+
+	fs := flag.NewFlagSet("autoloop", flag.ContinueOnError)
+	fs.SetOutput(stderr)
+	iface := fs.String("iface", "", "VPN interface (empty/auto = detect active)")
+	table := fs.String("table", "agvpn", "routing table name")
+	mtu := fs.Int("mtu", 1380, "MTU for default route")
+	stateDir := fs.String("state-dir", deps.StateDirDefault, "state directory")
+	defaultLoc := fs.String("default-location", "Austria", "default location")
+	if err := fs.Parse(args); err != nil {
+		return 2
+	}
+
+	resolvedIface := deps.ResolveIface(*iface)
+	if resolvedIface == "" {
+		fmt.Fprintln(stderr, "autoloop: cannot resolve VPN interface (set --iface or preferred iface)")
+		return 1
+	}
+
+	deps.Run(AutoloopParams{
+		Iface:           resolvedIface,
+		Table:           *table,
+		MTU:             *mtu,
+		StateDir:        *stateDir,
+		DefaultLocation: *defaultLoc,
+	})
+	return 0
+}