Allow updating Listen during runtime

src/yggdrasil/core.go

@@ -109,13 +109,14 @@ func (c *Core) UpdateConfig(config *config.NodeConfig) {
 
 	components := []chan chan error{
 		c.admin.reconfigure,
-		c.searches.reconfigure,
+		//c.searches.reconfigure,
-		c.dht.reconfigure,
+		//c.dht.reconfigure,
-		c.sessions.reconfigure,
+		//c.sessions.reconfigure,
+		//c.peers.reconfigure,
+		//c.router.reconfigure,
+		//c.switchTable.reconfigure,
+		c.tcp.reconfigure,
 		c.multicast.reconfigure,
-		c.peers.reconfigure,
-		c.router.reconfigure,
-		c.switchTable.reconfigure,
 	}
 
 	for _, component := range components {

src/yggdrasil/multicast.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net"
+	"sync"
 	"time"
 
 	"golang.org/x/net/ipv6"
@@ -14,6 +15,8 @@ type multicast struct {
 	reconfigure chan chan error
 	sock        *ipv6.PacketConn
 	groupAddr   string
+	myAddr      *net.TCPAddr
+	myAddrMutex sync.RWMutex
 }
 
 func (m *multicast) init(core *Core) {
@@ -23,6 +26,9 @@ func (m *multicast) init(core *Core) {
 		for {
 			select {
 			case e := <-m.reconfigure:
+				m.myAddrMutex.Lock()
+				m.myAddr = m.core.tcp.getAddr()
+				m.myAddrMutex.Unlock()
 				e <- nil
 			}
 		}
@@ -95,13 +101,14 @@ func (m *multicast) interfaces() []net.Interface {
 }
 
 func (m *multicast) announce() {
+	var anAddr net.TCPAddr
+	m.myAddrMutex.Lock()
+	m.myAddr = m.core.tcp.getAddr()
+	m.myAddrMutex.Unlock()
 	groupAddr, err := net.ResolveUDPAddr("udp6", m.groupAddr)
 	if err != nil {
 		panic(err)
 	}
-	var anAddr net.TCPAddr
-	myAddr := m.core.tcp.getAddr()
-	anAddr.Port = myAddr.Port
 	destAddr, err := net.ResolveUDPAddr("udp6", m.groupAddr)
 	if err != nil {
 		panic(err)
@@ -113,6 +120,9 @@ func (m *multicast) announce() {
 			if err != nil {
 				panic(err)
 			}
+			m.myAddrMutex.RLock()
+			anAddr.Port = m.myAddr.Port
+			m.myAddrMutex.RUnlock()
 			for _, addr := range addrs {
 				addrIP, _, _ := net.ParseCIDR(addr.String())
 				if addrIP.To4() != nil {

src/yggdrasil/tcp.go

@@ -38,7 +38,9 @@ const tcp_ping_interval = (default_tcp_timeout * 2 / 3)
 // The TCP listener and information about active TCP connections, to avoid duplication.
 type tcpInterface struct {
 	core        *Core
+	reconfigure chan chan error
 	serv        net.Listener
+	serv_stop   chan bool
 	tcp_timeout time.Duration
 	tcp_addr    string
 	mutex       sync.Mutex // Protecting the below
@@ -83,10 +85,37 @@ func (iface *tcpInterface) connectSOCKS(socksaddr, peeraddr string) {
 // Initializes the struct.
 func (iface *tcpInterface) init(core *Core) (err error) {
 	iface.core = core
+	iface.serv_stop = make(chan bool, 1)
+	iface.reconfigure = make(chan chan error, 1)
+	go func() {
+		for {
+			select {
+			case e := <-iface.reconfigure:
+				iface.core.configMutex.RLock()
+				updated := iface.core.config.Listen != iface.core.configOld.Listen
+				iface.core.configMutex.RUnlock()
+				if updated {
+					iface.serv_stop <- true
+					iface.serv.Close()
+					e <- iface.listen()
+				} else {
+					e <- nil
+				}
+			}
+		}
+	}()
+
+	return iface.listen()
+}
+
+func (iface *tcpInterface) listen() error {
+	var err error
+
 	iface.core.configMutex.RLock()
 	iface.tcp_addr = iface.core.config.Listen
 	iface.tcp_timeout = time.Duration(iface.core.config.ReadTimeout) * time.Millisecond
 	iface.core.configMutex.RUnlock()
+
 	if iface.tcp_timeout >= 0 && iface.tcp_timeout < default_tcp_timeout {
 		iface.tcp_timeout = default_tcp_timeout
 	}
@@ -96,6 +125,7 @@ func (iface *tcpInterface) init(core *Core) (err error) {
 		iface.calls = make(map[string]struct{})
 		iface.conns = make(map[tcpInfo](chan struct{}))
 		go iface.listener()
+		return nil
 	}
 
 	return err
@@ -107,11 +137,17 @@ func (iface *tcpInterface) listener() {
 	iface.core.log.Println("Listening for TCP on:", iface.serv.Addr().String())
 	for {
 		sock, err := iface.serv.Accept()
+		select {
+		case <-iface.serv_stop:
+			iface.core.log.Println("Stopping listener")
+			return
+		default:
 			if err != nil {
 				panic(err)
 			}
 			go iface.handler(sock, true)
 		}
+	}
 }
 
 // Checks if a connection already exists.
@@ -363,12 +399,12 @@ func (iface *tcpInterface) handler(sock net.Conn, incoming bool) {
 	themAddr := address.AddrForNodeID(themNodeID)
 	themAddrString := net.IP(themAddr[:]).String()
 	themString := fmt.Sprintf("%s@%s", themAddrString, them)
-	iface.core.log.Println("Connected:", themString, "source", us)
+	iface.core.log.Printf("Connected: %s, source: %s", themString, us)
 	err = iface.reader(sock, in) // In this goroutine, because of defers
 	if err == nil {
-		iface.core.log.Println("Disconnected:", themString, "source", us)
+		iface.core.log.Printf("Disconnected: %s, source: %s", themString, us)
 	} else {
-		iface.core.log.Println("Disconnected:", themString, "source", us, "with error:", err)
+		iface.core.log.Printf("Disconnected: %s, source: %s, error: %s", themString, us, err)
 	}
 	return
 }