switch hto monorepo structure

backend/internal/server/network/detect.go

@@ -0,0 +1,89 @@
+package network
+
+import (
+	"fmt"
+
+	"github.com/godbus/dbus/v5"
+)
+
+type BackendType int
+
+const (
+	BackendNone BackendType = iota
+	BackendNetworkManager
+	BackendIwd
+	BackendConnMan
+	BackendNetworkd
+)
+
+func nameHasOwner(bus *dbus.Conn, name string) (bool, error) {
+	obj := bus.Object("org.freedesktop.DBus", "/org/freedesktop/DBus")
+	var owned bool
+	if err := obj.Call("org.freedesktop.DBus.NameHasOwner", 0, name).Store(&owned); err != nil {
+		return false, err
+	}
+	return owned, nil
+}
+
+type DetectResult struct {
+	Backend      BackendType
+	HasNM        bool
+	HasIwd       bool
+	HasConnMan   bool
+	HasWpaSupp   bool
+	HasNetworkd  bool
+	ChosenReason string
+}
+
+func DetectNetworkStack() (*DetectResult, error) {
+	bus, err := dbus.ConnectSystemBus()
+	if err != nil {
+		return nil, fmt.Errorf("connect system bus: %w", err)
+	}
+	defer bus.Close()
+
+	hasNM, _ := nameHasOwner(bus, "org.freedesktop.NetworkManager")
+	hasIwd, _ := nameHasOwner(bus, "net.connman.iwd")
+	hasConn, _ := nameHasOwner(bus, "net.connman")
+	hasWpa, _ := nameHasOwner(bus, "fi.w1.wpa_supplicant1")
+	hasNetworkd, _ := nameHasOwner(bus, "org.freedesktop.network1")
+
+	res := &DetectResult{
+		HasNM:       hasNM,
+		HasIwd:      hasIwd,
+		HasConnMan:  hasConn,
+		HasWpaSupp:  hasWpa,
+		HasNetworkd: hasNetworkd,
+	}
+
+	switch {
+	case hasNM:
+		res.Backend = BackendNetworkManager
+		if hasIwd {
+			res.ChosenReason = "NetworkManager present; iwd also running (likely NM's Wi-Fi backend). Using NM API."
+		} else {
+			res.ChosenReason = "NetworkManager present. Using NM API."
+		}
+	case hasConn && hasIwd:
+		res.Backend = BackendConnMan
+		res.ChosenReason = "ConnMan + iwd detected. Use ConnMan API (iwd is its Wi-Fi daemon)."
+	case hasIwd && hasNetworkd:
+		res.Backend = BackendNetworkd
+		res.ChosenReason = "iwd + systemd-networkd detected. Using iwd for Wi-Fi association and networkd for IP/DHCP."
+	case hasIwd:
+		res.Backend = BackendIwd
+		res.ChosenReason = "iwd detected without NM/ConnMan. Using iwd API."
+	case hasNetworkd:
+		res.Backend = BackendNetworkd
+		res.ChosenReason = "systemd-networkd detected (no NM/ConnMan). Using networkd for L3 and wired."
+	default:
+		res.Backend = BackendNone
+		if hasWpa {
+			res.ChosenReason = "No NM/ConnMan/iwd; wpa_supplicant present. Consider a wpa_supplicant path."
+		} else {
+			res.ChosenReason = "No known network manager bus names found."
+		}
+	}
+
+	return res, nil
+}