WIP

Signed-off-by: Alejandro Mery <amery@jpi.io>

pkg/wireguard/config.go

@@ -1,17 +1,35 @@
 package wireguard
 
 import (
+	"bytes"
 	"errors"
 	"fmt"
 	"io"
 	"net/netip"
 	"strconv"
 	"strings"
+	"text/template"
 
 	"darvaza.org/core"
 	"gopkg.in/gcfg.v1"
 )
 
+var configTemplate = template.Must(template.New("config").Funcs(template.FuncMap{
+	"StringsJoin": strings.Join,
+}).Parse(`[Interface]
+Address = {{.Interface.Address}}
+PrivateKey = {{.Interface.PrivateKey}}
+ListenPort = {{.Interface.ListenPort}}
+{{range .Peer}}
+
+[Peer]
+# {{.Endpoint.Name}}
+PublicKey = {{.PublicKey}}
+Endpoint = {{.Endpoint}}
+AllowedIPs = {{ StringsJoin .AllowedIPs ", "}}
+{{end}}
+`))
+
 // Config represents a wgN.conf file
 type Config struct {
 	Interface InterfaceConfig
@@ -28,6 +46,17 @@ func (f *Config) Peers() int {
 	return len(f.Peer)
 }
 
+// WriteTo writes a Wireguard [Config] onto the provided [io.Writer]
+func (f *Config) WriteTo(w io.Writer) (int64, error) {
+	var buf bytes.Buffer
+
+	if err := configTemplate.Execute(&buf, f); err != nil {
+		return 0, err
+	}
+
+	return buf.WriteTo(w)
+}
+
 // InterfaceConfig represents the [Interface] section
 type InterfaceConfig struct {
 	Address    netip.Addr

pkg/zones/env.go

@@ -32,11 +32,14 @@ func (m *Zones) writeEnvZone(w io.Writer, z *Zone) {
 
 	// ZONE{zoneID}_GW
 	gatewayID := getRingZeroGatewayID(z)
-	m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
+	if gatewayID > 0 {
+		m.writeEnvVar(w, fmt.Sprintf("%v", gatewayID), "ZONE%v_%s", zoneID, "GW")
 
-	// ZONE{zoneID}_IP
+		// ZONE{zoneID}_IP
-	ip, _ := RingZeroAddress(zoneID, gatewayID)
+		if ip, ok := RingZeroAddress(zoneID, gatewayID); ok {
-	m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
+			m.writeEnvVar(w, ip.String(), "ZONE%v_%s", zoneID, "IP")
+		}
+	}
 }
 
 func (m *Zones) writeEnvVarFn(w io.Writer, fn func(*Zones) string, name string, args ...any) {
@@ -79,13 +82,9 @@ func genEnvZoneNodes(z *Zone) string {
 }
 
 func getRingZeroGatewayID(z *Zone) int {
-	var firstNodeID, gatewayID int
+	var gatewayID int
 
 	z.ForEachMachine(func(p *Machine) bool {
-		if firstNodeID == 0 {
-			firstNodeID = p.ID
-		}
-
 		if p.IsGateway() {
 			gatewayID = p.ID
 		}
@@ -93,10 +92,5 @@ func getRingZeroGatewayID(z *Zone) int {
 		return gatewayID != 0
 	})
 
-	switch {
+	return gatewayID
-	case gatewayID == 0:
-		return firstNodeID
-	default:
-		return gatewayID
-	}
 }

pkg/zones/machine.go

@@ -43,6 +43,24 @@ func (m *Machine) IsGateway() bool {
 	return ok
 }
 
+// SetGateway enables/disables a Machine ring0 integration
+func (m *Machine) SetGateway(enabled bool) error {
+	ri, found := m.getRingInfo(0)
+	switch {
+	case !found && !enabled:
+		return nil
+	case !found:
+		var err error
+
+		if ri, err = m.createRingInfo(0, false); err != nil {
+			return err
+		}
+	}
+
+	ri.Enabled = enabled
+	return m.SyncWireguardConfig(0)
+}
+
 func (m *Machine) getPeerByName(name string) (*Machine, bool) {
 	return m.zone.zones.GetMachineByName(name)
 }

pkg/zones/machine_rings.go

@@ -261,3 +261,54 @@ func (m *Machine) RemoveWireguardConfig(ring int) error {
 
 	return err
 }
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (m *Machine) SyncWireguardConfig(ring int) error {
+	return m.zone.SyncWireguardConfig(ring)
+}
+
+func (m *Machine) WriteWireguardConfig(ring int) error {
+	r, err := m.zone.GetRing(ring)
+	if err != nil {
+		return err
+	}
+
+	return m.writeWireguardRing(r)
+}
+
+func (m *Machine) writeWireguardRing(r *Ring) error {
+	wg, err := r.ExportConfig(m.ID)
+	if err != nil {
+		return nil
+	}
+
+	f, err := m.CreateTruncFile("wg%v.conf", r.Ring)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	_, err = wg.WriteTo(f)
+	return err
+}
+
+func (m *Machine) createRingInfo(ring int, enabled bool) (*RingInfo, error) {
+	keys, err := wireguard.NewKeyPair()
+	if err != nil {
+		return nil, err
+	}
+
+	ri := &RingInfo{
+		Ring:    ring,
+		Enabled: enabled,
+		Keys:    keys,
+	}
+
+	err = m.applyRingInfo(ring, ri)
+	if err != nil {
+		return nil, err
+	}
+
+	return ri, nil
+}

pkg/zones/scan.go

@@ -11,6 +11,7 @@ func (m *Zones) scan() error {
 		m.scanMachines,
 		m.scanZoneIDs,
 		m.scanSort,
+		m.scanGateways,
 	} {
 		if err := fn(); err != nil {
 			return err
@@ -115,6 +116,16 @@ func (m *Zones) scanSort() error {
 	return nil
 }
 
+func (m *Zones) scanGateways() error {
+	var err error
+
+	m.ForEachZone(func(z *Zone) bool {
+		_, _, err = z.GetGateway()
+		return err != nil
+	})
+	return err
+}
+
 func (z *Zone) scan() error {
 	// each directory is a machine
 	entries, err := fs.ReadDir(z.zones.dir, z.Name)
@@ -139,3 +150,41 @@ func (z *Zone) scan() error {
 
 	return nil
 }
+
+// GetGateway returns the first gateway found, if none
+// files will be created to enable the first [Machine] to
+// be one
+func (z *Zone) GetGateway() (*Machine, bool, error) {
+	var first *Machine
+	var gateway *Machine
+
+	z.zones.ForEachMachine(func(p *Machine) bool {
+		switch {
+		case p.IsGateway():
+			// found
+			gateway = p
+		case first == nil:
+			// remember
+			first = p
+		default:
+			// keep looking
+		}
+
+		return gateway != nil
+	})
+
+	switch {
+	case gateway != nil:
+		// found one
+		return gateway, false, nil
+	case first != nil:
+		// make one
+		if err := first.SetGateway(true); err != nil {
+			return first, false, err
+		}
+		return first, true, nil
+	default:
+		// Zone without nodes?
+		panic("unreachable")
+	}
+}

pkg/zones/sync.go

@@ -18,12 +18,12 @@ func (m *Zones) SyncAllWireguard() error {
 	var err error
 
 	for ring := 0; ring < RingsCount; ring++ {
-		err = m.PruneWireguardConfig(ring)
+		err = m.WriteWireguardKeys(ring)
 		if err != nil {
 			return err
 		}
 
-		err = m.WriteWireguardKeys(ring)
+		err = m.SyncWireguardConfig(ring)
 		if err != nil {
 			return err
 		}

pkg/zones/zone_rings.go

@@ -1,6 +1,45 @@
 package zones
 
-import "os"
+import (
+	"os"
+
+	"git.jpi.io/amery/jpictl/pkg/wireguard"
+)
+
+type Ring struct {
+	Ring int
+}
+
+func (*Ring) ExportConfig(_ int) (*wireguard.Config, error) {
+	return nil, nil
+}
+
+func (*Zone) GetRing(_ int) (*Ring, error) {
+	return &Ring{}, nil
+}
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (z *Zone) SyncWireguardConfig(ring int) error {
+	err := z.PruneWireguardConfig(ring)
+	if err != nil {
+		return err
+	}
+
+	r, err := z.GetRing(ring)
+	if err != nil {
+		return err
+	}
+
+	z.ForEachMachine(func(p *Machine) bool {
+		if _, ok := p.getRingInfo(ring); ok {
+			err = p.writeWireguardRing(r)
+		}
+		return err != nil
+	})
+
+	return err
+}
 
 // PruneWireguardConfig removes wgN.conf files of machines with
 // the corresponding ring disabled.
@@ -59,3 +98,13 @@ func (m *Zones) WriteWireguardKeys(ring int) error {
 
 	return err
 }
+
+// SyncWireguardConfig updates all wgN.conf files for the specified
+// ring
+func (m *Zones) SyncWireguardConfig(ring int) error {
+	err := m.PruneWireguardConfig(ring)
+	if err != nil {
+		return err
+	}
+
+}

pkg/zones/zones.go

@@ -34,6 +34,31 @@ func (z *Zone) ForEachMachine(fn func(*Machine) bool) {
 	}
 }
 
+// SetGateway configures a machine to be the zone's ring0 gateway
+func (z *Zone) SetGateway(gatewayID int, enabled bool) error {
+	var err error
+	var found bool
+
+	z.ForEachMachine(func(p *Machine) bool {
+		if p.ID == gatewayID {
+			found = true
+			err = p.SetGateway(enabled)
+
+			return true
+		}
+		return false
+	})
+
+	switch {
+	case err != nil:
+		return err
+	case !found:
+		return fs.ErrNotExist
+	default:
+		return nil
+	}
+}
+
 // Zones represents all zones in a cluster
 type Zones struct {
 	dir      fs.FS