Update changelog

No need to extract it again when the url package provides it for us:
```
$ jq -n '{"AdminListen":"unix:///tmp/ygg.sock"}' | ./yggdrasil -useconf | grep 'admin socket'
2024/10/08 22:41:11 UNIX admin socket listening on /tmp/ygg.sock
```

Follow-up on #1176

.github/workflows/ci.yml

@@ -17,10 +17,10 @@ jobs:
     steps:
       - uses: actions/setup-go@v5
         with:
-          go-version: 1.21
+          go-version: stable
       - uses: actions/checkout@v4
       - name: golangci-lint
-        uses: golangci/golangci-lint-action@v3
+        uses: golangci/golangci-lint-action@v6
         with:
           args: --issues-exit-code=1
 
@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.21", "1.22"]
+        goversion: ["1.21", "1.22", "1.23"]
 
     name: Build & Test (Linux, Go ${{ matrix.goversion }})
     needs: [lint]
@@ -75,7 +75,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.21", "1.22"]
+        goversion: ["1.21", "1.22", "1.23"]
 
     name: Build & Test (Windows, Go ${{ matrix.goversion }})
     needs: [lint]
@@ -99,7 +99,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.21", "1.22"]
+        goversion: ["1.21", "1.22", "1.23"]
 
     name: Build & Test (macOS, Go ${{ matrix.goversion }})
     needs: [lint]
@@ -123,7 +123,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        goversion: ["1.21", "1.22"]
+        goversion: ["1.21", "1.22", "1.23"]
         goos:
           - freebsd
           - openbsd

.golangci.yml

@@ -2,9 +2,10 @@ run:
   build-tags:
     - lint
   issues-exit-code: 0 # TODO: change this to 1 when we want it to fail builds
-  skip-dirs:
+issues:
+  exclude-dirs:
     - contrib/
     - misc/
 linters:
   disable:
-    - gocyclo
+    - gocyclo

CHANGELOG.md

@@ -26,6 +26,57 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - in case of vulnerabilities.
 -->
 
+## [0.5.9] - 2024-10-19
+
+### Added
+
+* New command line option `-user` for changing the process UID/GID
+
+### Changed
+
+* The routing algorithm has been updated with RTT-aware link costing, which should prefer lower latency links over higher latency links where possible
+  * The calculated cost is an average of the link RTT, but newly established links are costed higher to begin with, such that unstable peerings can be avoided
+  * Link costs are only used where multiple next-hops are available and will be ignored if there is only one loop-free path to the destination
+  * This is protocol-compatible with existing v0.5.x nodes but will have the best results when peering with nodes that are also running the latest version
+  * The `getPeers` endpoint will now report the calculated link cost for each given peer
+* Upgrade dependencies
+
+### Fixed
+
+* Multicast discovery should now work again when building Yggdrasil as an Android framework
+* Multicast discovery will now correctly ignore interfaces that are not marked as running
+* Ephemeral links, such as those added by multicast, will no longer try to reconnect in a fast loop, fixing a high CPU issue
+* The TUN interface will no longer stop working when hitting a segment read error from vectorised reads
+* The `AllowedPublicKeys` option will once again no longer apply to multicast peerings, as was originally intended
+* A potential panic when shutting down peering links has been fixed
+* A redundant system call for setting MTU on OpenBSD has been removed
+
+## [0.5.8] - 2024-08-12
+
+### Fixed
+
+* A bug which caused startup problems on Windows and FreeBSD should be fixed
+* Resolved some minor link state and listener management bugs during shutdown
+
+## [0.5.7] - 2024-08-05
+
+### Added
+
+* WebSocket support for peerings, by using the new `ws://` scheme in `Listen` and `Peers`
+  * Additionally, the `wss://` scheme can be used to connect to a WebSocket peer behind a HTTPS reverse proxy
+
+### Changed
+
+* On Linux, the TUN adapter now uses vectorised reads/writes where possible, which should reduce the amount of CPU time spent on syscalls and potentially improve throughput
+* Link error handling has been improved and various link error messages have been rewritten to be clearer
+* Upgrade dependencies
+
+### Fixed
+
+* Multiple multicast connections to the same remote machine should now work correctly
+  * You may get two connections in some cases, one inbound and one outbound, this is known and will not cause problems
+* Running as a Windows service should be more reliable with service startup and shutdown bugs fixed
+
 ## [0.5.6] - 2024-05-30
 
 * Go 1.21 is now required to build Yggdrasil

cmd/yggdrasil/chuser_other.go

@@ -0,0 +1,10 @@
+//go:build !aix && !darwin && !dragonfly && !freebsd && !linux && !netbsd && !openbsd && !solaris
+// +build !aix,!darwin,!dragonfly,!freebsd,!linux,!netbsd,!openbsd,!solaris
+
+package main
+
+import "errors"
+
+func chuser(user string) error {
+	return errors.New("setting uid/gid is not supported on this platform")
+}

cmd/yggdrasil/chuser_unix.go

@@ -0,0 +1,87 @@
+//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris
+// +build aix darwin dragonfly freebsd linux netbsd openbsd solaris
+
+package main
+
+import (
+	"errors"
+	"fmt"
+	"math"
+	osuser "os/user"
+	"strconv"
+	"strings"
+	"syscall"
+)
+
+func chuser(user string) error {
+	group := ""
+	if i := strings.IndexByte(user, ':'); i >= 0 {
+		user, group = user[:i], user[i+1:]
+	}
+
+	u := (*osuser.User)(nil)
+	g := (*osuser.Group)(nil)
+
+	if user != "" {
+		if _, err := strconv.ParseUint(user, 10, 32); err == nil {
+			u, err = osuser.LookupId(user)
+			if err != nil {
+				return fmt.Errorf("failed to lookup user by id %q: %v", user, err)
+			}
+		} else {
+			u, err = osuser.Lookup(user)
+			if err != nil {
+				return fmt.Errorf("failed to lookup user by name %q: %v", user, err)
+			}
+		}
+	}
+	if group != "" {
+		if _, err := strconv.ParseUint(group, 10, 32); err == nil {
+			g, err = osuser.LookupGroupId(group)
+			if err != nil {
+				return fmt.Errorf("failed to lookup group by id %q: %v", user, err)
+			}
+		} else {
+			g, err = osuser.LookupGroup(group)
+			if err != nil {
+				return fmt.Errorf("failed to lookup group by name %q: %v", user, err)
+			}
+		}
+	}
+
+	if g != nil {
+		gid, _ := strconv.ParseUint(g.Gid, 10, 32)
+		var err error
+		if gid < math.MaxInt {
+			err = syscall.Setgid(int(gid))
+		} else {
+			err = errors.New("gid too big")
+		}
+
+		if err != nil {
+			return fmt.Errorf("failed to setgid %d: %v", gid, err)
+		}
+	} else if u != nil {
+		gid, _ := strconv.ParseUint(u.Gid, 10, 32)
+		err := syscall.Setgid(int(uint32(gid)))
+		if err != nil {
+			return fmt.Errorf("failed to setgid %d: %v", gid, err)
+		}
+	}
+
+	if u != nil {
+		uid, _ := strconv.ParseUint(u.Uid, 10, 32)
+		var err error
+		if uid < math.MaxInt {
+			err = syscall.Setuid(int(uid))
+		} else {
+			err = errors.New("uid too big")
+		}
+
+		if err != nil {
+			return fmt.Errorf("failed to setuid %d: %v", uid, err)
+		}
+	}
+
+	return nil
+}

cmd/yggdrasil/main.go

@@ -52,14 +52,15 @@ func main() {
 	getsnet := flag.Bool("subnet", false, "use in combination with either -useconf or -useconffile, outputs your IPv6 subnet")
 	getpkey := flag.Bool("publickey", false, "use in combination with either -useconf or -useconffile, outputs your public key")
 	loglevel := flag.String("loglevel", "info", "loglevel to enable")
+	chuserto := flag.String("user", "", "user (and, optionally, group) to set UID/GID to")
 	flag.Parse()
 
+	done := make(chan struct{})
+	defer close(done)
+
 	// Catch interrupts from the operating system to exit gracefully.
 	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 
-	// Capture the service being stopped on Windows.
-	minwinsvc.SetOnExit(cancel)
-
 	// Create a new logger that logs output to stdout.
 	var logger *log.Logger
 	switch *logto {
@@ -272,6 +273,22 @@ func main() {
 		}
 	}
 
+	//Windows service shutdown
+	minwinsvc.SetOnExit(func() {
+		logger.Infof("Shutting down service ...")
+		cancel()
+		// Wait for all parts to shutdown properly
+		<-done
+	})
+
+	// Change user if requested
+	if *chuserto != "" {
+		err = chuser(*chuserto)
+		if err != nil {
+			panic(err)
+		}
+	}
+
 	// Block until we are told to shut down.
 	<-ctx.Done()
 

cmd/yggdrasilctl/cmd_line_env.go

@@ -38,7 +38,6 @@ func (cmdLineEnv *CmdLineEnv) parseFlagsAndArgs() {
 		fmt.Println("Examples:")
 		fmt.Println("  - ", os.Args[0], "list")
 		fmt.Println("  - ", os.Args[0], "getPeers")
-		fmt.Println("  - ", os.Args[0], "setTunTap name=auto mtu=1500 tap_mode=false")
 		fmt.Println("  - ", os.Args[0], "-endpoint=tcp://localhost:9001 getPeers")
 		fmt.Println("  - ", os.Args[0], "-endpoint=unix:///var/run/ygg.sock getPeers")
 	}

cmd/yggdrasilctl/main.go

@@ -174,7 +174,7 @@ func run() int {
 		if err := json.Unmarshal(recv.Response, &resp); err != nil {
 			panic(err)
 		}
-		table.SetHeader([]string{"URI", "State", "Dir", "IP Address", "Uptime", "RTT", "RX", "TX", "Pr", "Last Error"})
+		table.SetHeader([]string{"URI", "State", "Dir", "IP Address", "Uptime", "RTT", "RX", "TX", "Pr", "Cost", "Last Error"})
 		for _, peer := range resp.Peers {
 			state, lasterr, dir, rtt := "Up", "-", "Out", "-"
 			if !peer.Up {
@@ -200,6 +200,7 @@ func run() int {
 				peer.RXBytes.String(),
 				peer.TXBytes.String(),
 				fmt.Sprintf("%d", peer.Priority),
+				fmt.Sprintf("%d", peer.Cost),
 				lasterr,
 			})
 		}

contrib/mobile/build

@@ -7,6 +7,7 @@ set -ef
 PKGSRC=${PKGSRC:-github.com/yggdrasil-network/yggdrasil-go/src/version}
 PKGNAME=${PKGNAME:-$(sh contrib/semver/name.sh)}
 PKGVER=${PKGVER:-$(sh contrib/semver/version.sh --bare)}
+GOVER=$(go version | { read _ _ version _; echo ${version#go}; })
 
 LDFLAGS="-X $PKGSRC.buildName=$PKGNAME -X $PKGSRC.buildVersion=$PKGVER"
 ARGS="-v"
@@ -33,6 +34,15 @@ if [ ! $IOS ] && [ ! $ANDROID ]; then
   exit 1
 fi
 
+ver_le() {
+    printf "$1\n$2\n" | sort -VC
+}
+
+if [ $ANDROID ] && ver_le 1.23.0 $GOVER ; then
+    # github.com/wlynxg/anet library relies on //go:linkname
+    LDFLAGS="$LDFLAGS -checklinkname=0"
+fi
+
 if [ $IOS ]; then
   echo "Building framework for iOS"
   go get golang.org/x/mobile/bind

contrib/mobile/mobile.go

@@ -15,8 +15,6 @@ import (
 	"github.com/yggdrasil-network/yggdrasil-go/src/multicast"
 	"github.com/yggdrasil-network/yggdrasil-go/src/tun"
 	"github.com/yggdrasil-network/yggdrasil-go/src/version"
-
-	_ "golang.org/x/mobile/bind"
 )
 
 // Yggdrasil mobile package is meant to "plug the gap" for mobile support, as

contrib/mobile/mobile_apple.go

@@ -1,5 +1,5 @@
-//go:build ios
-// +build ios
+//go:build ios || darwin
+// +build ios darwin
 
 package mobile
 

contrib/mobile/mobile_other.go

@@ -1,5 +1,5 @@
-//go:build !android && !ios
-// +build !android,!ios
+//go:build !android && !ios && !darwin
+// +build !android,!ios,!darwin
 
 package mobile
 

go.mod

@@ -3,21 +3,23 @@ module github.com/yggdrasil-network/yggdrasil-go
 go 1.21
 
 require (
-	github.com/Arceliar/ironwood v0.0.0-20240529054413-b8e59574e2b2
+	github.com/Arceliar/ironwood v0.0.0-20241016082300-f6fb9da97a17
 	github.com/Arceliar/phony v0.0.0-20220903101357-530938a4b13d
-	github.com/cheggaaa/pb/v3 v3.1.4
+	github.com/cheggaaa/pb/v3 v3.1.5
+	github.com/coder/websocket v1.8.12
 	github.com/gologme/log v1.3.0
 	github.com/hashicorp/go-syslog v1.0.0
 	github.com/hjson/hjson-go/v4 v4.4.0
 	github.com/kardianos/minwinsvc v1.0.2
-	github.com/quic-go/quic-go v0.44.0
-	github.com/vishvananda/netlink v1.1.0
-	golang.org/x/crypto v0.23.0
-	golang.org/x/mobile v0.0.0-20240520174638-fa72addaaa1b
-	golang.org/x/net v0.25.0
-	golang.org/x/sys v0.20.0
-	golang.org/x/text v0.15.0
-	golang.zx2c4.com/wireguard v0.0.0-20230223181233-21636207a675
+	github.com/quic-go/quic-go v0.46.0
+	github.com/vishvananda/netlink v1.3.0
+	github.com/wlynxg/anet v0.0.5
+	golang.org/x/crypto v0.28.0
+	golang.org/x/net v0.30.0
+	golang.org/x/sys v0.26.0
+	golang.org/x/text v0.19.0
+	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2
+	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
 	golang.zx2c4.com/wireguard/windows v0.5.3
 )
 
@@ -30,18 +32,17 @@ require (
 	github.com/onsi/ginkgo/v2 v2.9.5 // indirect
 	github.com/rivo/uniseg v0.2.0 // indirect
 	go.uber.org/mock v0.4.0 // indirect
-	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 // indirect
-	golang.org/x/mod v0.17.0 // indirect
-	golang.org/x/sync v0.7.0 // indirect
-	golang.org/x/tools v0.21.0 // indirect
-	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
+	golang.org/x/exp v0.0.0-20240719175910-8a7402abbf56 // indirect
+	golang.org/x/mod v0.19.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/tools v0.23.0 // indirect
 )
 
 require (
 	github.com/VividCortex/ewma v1.2.0 // indirect
 	github.com/fatih/color v1.15.0 // indirect
 	github.com/mattn/go-isatty v0.0.19 // indirect
-	github.com/mattn/go-runewidth v0.0.14 // indirect
+	github.com/mattn/go-runewidth v0.0.15 // indirect
 	github.com/olekukonko/tablewriter v0.0.5
-	github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f // indirect
+	github.com/vishvananda/netns v0.0.4 // indirect
 )

go.sum

@@ -1,5 +1,5 @@
-github.com/Arceliar/ironwood v0.0.0-20240529054413-b8e59574e2b2 h1:SBdYBKeXYUUFef5wi2CMhYmXFVGiYaRpTvbki0Bu+JQ=
-github.com/Arceliar/ironwood v0.0.0-20240529054413-b8e59574e2b2/go.mod h1:6WP4799FX0OuWdENGQAh+0RXp9FLh0y7NZ7tM9cJyXk=
+github.com/Arceliar/ironwood v0.0.0-20241016082300-f6fb9da97a17 h1:uOvHqPwu09ndYZQDUL6QvyDcz0M9kwooKYa/PEfLwIU=
+github.com/Arceliar/ironwood v0.0.0-20241016082300-f6fb9da97a17/go.mod h1:6WP4799FX0OuWdENGQAh+0RXp9FLh0y7NZ7tM9cJyXk=
 github.com/Arceliar/phony v0.0.0-20220903101357-530938a4b13d h1:UK9fsWbWqwIQkMCz1CP+v5pGbsGoWAw6g4AyvMpm1EM=
 github.com/Arceliar/phony v0.0.0-20220903101357-530938a4b13d/go.mod h1:BCnxhRf47C/dy/e/D2pmB8NkB3dQVIrkD98b220rx5Q=
 github.com/VividCortex/ewma v1.2.0 h1:f58SaIzcDXrSy3kWaHNvuJgJ3Nmz59Zji6XoJR/q1ow=
@@ -9,11 +9,13 @@ github.com/bits-and-blooms/bitset v1.13.0 h1:bAQ9OPNFYbGHV6Nez0tmNI0RiEu7/hxlYJR
 github.com/bits-and-blooms/bitset v1.13.0/go.mod h1:7hO7Gc7Pp1vODcmWvKMRA9BNmbv6a/7QIWpPxHddWR8=
 github.com/bits-and-blooms/bloom/v3 v3.7.0 h1:VfknkqV4xI+PsaDIsoHueyxVDZrfvMn56jeWUzvzdls=
 github.com/bits-and-blooms/bloom/v3 v3.7.0/go.mod h1:VKlUSvp0lFIYqxJjzdnSsZEw4iHb1kOL2tfHTgyJBHg=
-github.com/cheggaaa/pb/v3 v3.1.4 h1:DN8j4TVVdKu3WxVwcRKu0sG00IIU6FewoABZzXbRQeo=
-github.com/cheggaaa/pb/v3 v3.1.4/go.mod h1:6wVjILNBaXMs8c21qRiaUM8BR82erfgau1DQ4iUXmSA=
+github.com/cheggaaa/pb/v3 v3.1.5 h1:QuuUzeM2WsAqG2gMqtzaWithDJv0i+i6UlnwSCI4QLk=
+github.com/cheggaaa/pb/v3 v3.1.5/go.mod h1:CrxkeghYTXi1lQBEI7jSn+3svI3cuc19haAj6jM60XI=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
+github.com/coder/websocket v1.8.12 h1:5bUXkEPPIbewrnkU8LTCLVaxi4N4J8ahufH2vlo4NAo=
+github.com/coder/websocket v1.8.12/go.mod h1:LNVeNrXQZfe5qhS9ALED3uA+l5pPqvwXg3CKoDBB2gs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -27,6 +29,8 @@ github.com/golang/protobuf v1.5.3 h1:KhyjKVUg7Usr/dYsdSqoFveMYd5ko72D+zANwlG1mmg
 github.com/golang/protobuf v1.5.3/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/gologme/log v1.3.0 h1:l781G4dE+pbigClDSDzSaaYKtiueHCILUa/qSDsmHAo=
 github.com/gologme/log v1.3.0/go.mod h1:yKT+DvIPdDdDoPtqFrFxheooyVmoqi0BAsw+erN3wA4=
+github.com/google/btree v1.0.1 h1:gK4Kx5IaGY9CD5sPJ36FHiBJ6ZXl0kilRiiCj+jdYp4=
+github.com/google/btree v1.0.1/go.mod h1:xXMiIv4Fb/0kKde4SpL7qlzvu5cMJDRkFDxJfI9uaxA=
 github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 h1:yAJXTCF9TqKcTiHJAE8dj7HMvPfh66eeA2JYW7eFpSE=
@@ -44,8 +48,8 @@ github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/
 github.com/mattn/go-isatty v0.0.19 h1:JITubQf0MOLdlGRuRq+jtsDlekdYPia9ZFsB8h/APPA=
 github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
-github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWVwUuU=
-github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mattn/go-runewidth v0.0.15 h1:UNAjwbU9l54TA3KzvqLGxwWjHmMgBUVhBiTjelZgg3U=
+github.com/mattn/go-runewidth v0.0.15/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/olekukonko/tablewriter v0.0.5 h1:P2Ga83D34wi1o9J6Wh1mRuqd4mF/x/lgBS7N7AbDhec=
 github.com/olekukonko/tablewriter v0.0.5/go.mod h1:hPp6KlRPjbx+hW8ykQs1w3UBbZlj6HuIJcUGPhkA7kY=
 github.com/onsi/ginkgo/v2 v2.9.5 h1:+6Hr4uxzP4XIUyAkg61dWBw8lb/gc4/X5luuxN/EC+Q=
@@ -54,8 +58,8 @@ github.com/onsi/gomega v1.27.6 h1:ENqfyGeS5AX/rlXDd/ETokDz93u0YufY1Pgxuy/PvWE=
 github.com/onsi/gomega v1.27.6/go.mod h1:PIQNjfQwkP3aQAH7lf7j87O/5FiNr+ZR8+ipb+qQlhg=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/quic-go/quic-go v0.44.0 h1:So5wOr7jyO4vzL2sd8/pD9Kesciv91zSk8BoFngItQ0=
-github.com/quic-go/quic-go v0.44.0/go.mod h1:z4cx/9Ny9UtGITIPzmPTXh1ULfOyWh4qGQlpnPcWmek=
+github.com/quic-go/quic-go v0.46.0 h1:uuwLClEEyk1DNvchH8uCByQVjo3yKL9opKulExNDs7Y=
+github.com/quic-go/quic-go v0.46.0/go.mod h1:1dLehS7TIR64+vxGR70GDcatWTOtMX2PUtnKsjbTurI=
 github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
 github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
@@ -63,55 +67,56 @@ github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
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 github.com/twmb/murmur3 v1.1.6/go.mod h1:Qq/R7NUyOfr65zD+6Q5IHKsJLwP7exErjN6lyyq3OSQ=
-github.com/vishvananda/netlink v1.1.0 h1:1iyaYNBLmP6L0220aDnYQpo1QEV4t4hJ+xEEhhJH8j0=
-github.com/vishvananda/netlink v1.1.0/go.mod h1:cTgwzPIzzgDAYoQrMm0EdrjRUBkTqKYppBueQtXaqoE=
-github.com/vishvananda/netns v0.0.0-20191106174202-0a2b9b5464df/go.mod h1:JP3t17pCcGlemwknint6hfoeCVQrEMVwxRLRjXpq+BU=
-github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f h1:p4VB7kIXpOQvVn1ZaTIVp+3vuYAXFe3OJEvjbUYJLaA=
-github.com/vishvananda/netns v0.0.0-20210104183010-2eb08e3e575f/go.mod h1:DD4vA1DwXk04H54A1oHXtwZmA0grkVMdPxx/VGLCah0=
+github.com/vishvananda/netlink v1.3.0 h1:X7l42GfcV4S6E4vHTsw48qbrV+9PVojNfIhZcwQdrZk=
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-golang.org/x/crypto v0.23.0 h1:dIJU/v2J8Mdglj/8rJ6UUOM3Zc9zLZxVZwwxMooUSAI=
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-golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842 h1:vr/HnozRka3pE4EsMEg1lgkXJkTFJCVUX+S/ZT6wYzM=
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 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
 golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.26.0 h1:KHjCJyddX0LoSTb3J+vWpupP9p0oznkqVk/IfjymZbo=
+golang.org/x/sys v0.26.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -124,26 +129,29 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
 golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
+golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
 golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
 golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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-golang.zx2c4.com/wireguard v0.0.0-20230223181233-21636207a675 h1:/J/RVnr7ng4fWPRH3xa4WtBJ1Jp+Auu4YNLmGiPv5QU=
-golang.zx2c4.com/wireguard v0.0.0-20230223181233-21636207a675/go.mod h1:whfbyDBt09xhCYQWtO2+3UVjlaq6/9hDZrjg2ZE6SyA=
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-google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
-google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
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+gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259 h1:TbRPT0HtzFP3Cno1zZo7yPzEEnfu8EjLfl6IU9VfqkQ=
+gvisor.dev/gvisor v0.0.0-20230927004350-cbd86285d259/go.mod h1:AVgIgHMwK63XvmAzWG9vLQ41YnVHN0du0tEC46fI7yY=

src/admin/addpeer.go

@@ -12,7 +12,7 @@ type AddPeerRequest struct {
 
 type AddPeerResponse struct{}
 
-func (a *AdminSocket) addPeerHandler(req *AddPeerRequest, res *AddPeerResponse) error {
+func (a *AdminSocket) addPeerHandler(req *AddPeerRequest, _ *AddPeerResponse) error {
 	u, err := url.Parse(req.Uri)
 	if err != nil {
 		return fmt.Errorf("unable to parse peering URI: %w", err)

src/admin/admin.go

@@ -201,10 +201,6 @@ func (a *AdminSocket) SetupAdminHandlers() {
 			return res, nil
 		},
 	)
-	//_ = a.AddHandler("getNodeInfo", []string{"key"}, t.proto.nodeinfo.nodeInfoAdminHandler)
-	//_ = a.AddHandler("debug_remoteGetSelf", []string{"key"}, t.proto.getSelfHandler)
-	//_ = a.AddHandler("debug_remoteGetPeers", []string{"key"}, t.proto.getPeersHandler)
-	//_ = a.AddHandler("debug_remoteGetDHT", []string{"key"}, t.proto.getDHTHandler)
 }
 
 // IsStarted returns true if the module has been started.
@@ -242,34 +238,33 @@ func (a *AdminSocket) listen() {
 	if err == nil {
 		switch strings.ToLower(u.Scheme) {
 		case "unix":
-			if _, err := os.Stat(listenaddr[7:]); err == nil {
-				a.log.Debugln("Admin socket", listenaddr[7:], "already exists, trying to clean up")
-				if _, err := net.DialTimeout("unix", listenaddr[7:], time.Second*2); err == nil || err.(net.Error).Timeout() {
-					a.log.Errorln("Admin socket", listenaddr[7:], "already exists and is in use by another process")
+			if _, err := os.Stat(u.Path); err == nil {
+				a.log.Debugln("Admin socket", u.Path, "already exists, trying to clean up")
+				if _, err := net.DialTimeout("unix", u.Path, time.Second*2); err == nil || err.(net.Error).Timeout() {
+					a.log.Errorln("Admin socket", u.Path, "already exists and is in use by another process")
 					os.Exit(1)
 				} else {
-					if err := os.Remove(listenaddr[7:]); err == nil {
-						a.log.Debugln(listenaddr[7:], "was cleaned up")
+					if err := os.Remove(u.Path); err == nil {
+						a.log.Debugln(u.Path, "was cleaned up")
 					} else {
-						a.log.Errorln(listenaddr[7:], "already exists and was not cleaned up:", err)
+						a.log.Errorln(u.Path, "already exists and was not cleaned up:", err)
 						os.Exit(1)
 					}
 				}
 			}
-			a.listener, err = net.Listen("unix", listenaddr[7:])
+			a.listener, err = net.Listen("unix", u.Path)
 			if err == nil {
-				switch listenaddr[7:8] {
+				switch u.Path[:1] {
 				case "@": // maybe abstract namespace
 				default:
-					if err := os.Chmod(listenaddr[7:], 0660); err != nil {
-						a.log.Warnln("WARNING:", listenaddr[:7], "may have unsafe permissions!")
+					if err := os.Chmod(u.Path, 0660); err != nil {
+						a.log.Warnln("WARNING:", u.Path, "may have unsafe permissions!")
 					}
 				}
 			}
 		case "tcp":
 			a.listener, err = net.Listen("tcp", u.Host)
 		default:
-			// err = errors.New(fmt.Sprint("protocol not supported: ", u.Scheme))
 			a.listener, err = net.Listen("tcp", listenaddr)
 		}
 	} else {
@@ -309,23 +304,6 @@ func (a *AdminSocket) handleRequest(conn net.Conn) {
 
 	defer conn.Close()
 
-	/*
-		defer func() {
-			r := recover()
-			if r != nil {
-				fmt.Println("ERROR:", r)
-				a.log.Debugln("Admin socket error:", r)
-				if err := encoder.Encode(&ErrorResponse{
-					Error: "Check your syntax and input types",
-				}); err != nil {
-					fmt.Println("ERROR 2:", err)
-					a.log.Debugln("Admin socket JSON encode error:", err)
-				}
-				conn.Close()
-			}
-		}()
-	*/
-
 	for {
 		var err error
 		var buf json.RawMessage

src/admin/getpaths.go

@@ -3,7 +3,7 @@ package admin
 import (
 	"encoding/hex"
 	"net"
-	"sort"
+	"slices"
 	"strings"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
@@ -23,7 +23,7 @@ type PathEntry struct {
 	Sequence  uint64   `json:"sequence"`
 }
 
-func (a *AdminSocket) getPathsHandler(req *GetPathsRequest, res *GetPathsResponse) error {
+func (a *AdminSocket) getPathsHandler(_ *GetPathsRequest, res *GetPathsResponse) error {
 	paths := a.core.GetPaths()
 	res.Paths = make([]PathEntry, 0, len(paths))
 	for _, p := range paths {
@@ -35,8 +35,8 @@ func (a *AdminSocket) getPathsHandler(req *GetPathsRequest, res *GetPathsRespons
 			Sequence:  p.Sequence,
 		})
 	}
-	sort.SliceStable(res.Paths, func(i, j int) bool {
-		return strings.Compare(res.Paths[i].PublicKey, res.Paths[j].PublicKey) < 0
+	slices.SortStableFunc(res.Paths, func(a, b PathEntry) int {
+		return strings.Compare(a.PublicKey, b.PublicKey)
 	})
 	return nil
 }

src/admin/getpeers.go

@@ -3,7 +3,8 @@ package admin
 import (
 	"encoding/hex"
 	"net"
-	"sort"
+	"slices"
+	"strings"
 	"time"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
@@ -24,6 +25,7 @@ type PeerEntry struct {
 	PublicKey     string        `json:"key"`
 	Port          uint64        `json:"port"`
 	Priority      uint64        `json:"priority"`
+	Cost          uint64        `json:"cost"`
 	RXBytes       DataUnit      `json:"bytes_recvd,omitempty"`
 	TXBytes       DataUnit      `json:"bytes_sent,omitempty"`
 	Uptime        float64       `json:"uptime,omitempty"`
@@ -32,7 +34,7 @@ type PeerEntry struct {
 	LastError     string        `json:"last_error,omitempty"`
 }
 
-func (a *AdminSocket) getPeersHandler(req *GetPeersRequest, res *GetPeersResponse) error {
+func (a *AdminSocket) getPeersHandler(_ *GetPeersRequest, res *GetPeersResponse) error {
 	peers := a.core.GetPeers()
 	res.Peers = make([]PeerEntry, 0, len(peers))
 	for _, p := range peers {
@@ -41,6 +43,7 @@ func (a *AdminSocket) getPeersHandler(req *GetPeersRequest, res *GetPeersRespons
 			Up:       p.Up,
 			Inbound:  p.Inbound,
 			Priority: uint64(p.Priority), // can't be uint8 thanks to gobind
+			Cost:     p.Cost,
 			URI:      p.URI,
 			RXBytes:  DataUnit(p.RXBytes),
 			TXBytes:  DataUnit(p.TXBytes),
@@ -59,17 +62,26 @@ func (a *AdminSocket) getPeersHandler(req *GetPeersRequest, res *GetPeersRespons
 		}
 		res.Peers = append(res.Peers, peer)
 	}
-	sort.Slice(res.Peers, func(i, j int) bool {
-		if res.Peers[i].Inbound == res.Peers[j].Inbound {
-			if res.Peers[i].PublicKey == res.Peers[j].PublicKey {
-				if res.Peers[i].Priority == res.Peers[j].Priority {
-					return res.Peers[i].Uptime > res.Peers[j].Uptime
-				}
-				return res.Peers[i].Priority < res.Peers[j].Priority
-			}
-			return res.Peers[i].PublicKey < res.Peers[j].PublicKey
+	slices.SortStableFunc(res.Peers, func(a, b PeerEntry) int {
+		if !a.Inbound && b.Inbound {
+			return -1
 		}
-		return !res.Peers[i].Inbound && res.Peers[j].Inbound
+		if a.Inbound && !b.Inbound {
+			return 1
+		}
+		if d := strings.Compare(a.PublicKey, b.PublicKey); d != 0 {
+			return d
+		}
+		if d := a.Priority - b.Priority; d != 0 {
+			return int(d)
+		}
+		if d := a.Cost - b.Cost; d != 0 {
+			return int(d)
+		}
+		if d := a.Uptime - b.Uptime; d != 0 {
+			return int(d)
+		}
+		return 0
 	})
 	return nil
 }

src/admin/getself.go

@@ -17,7 +17,7 @@ type GetSelfResponse struct {
 	Subnet         string `json:"subnet"`
 }
 
-func (a *AdminSocket) getSelfHandler(req *GetSelfRequest, res *GetSelfResponse) error {
+func (a *AdminSocket) getSelfHandler(_ *GetSelfRequest, res *GetSelfResponse) error {
 	self := a.core.GetSelf()
 	snet := a.core.Subnet()
 	res.BuildName = version.BuildName()

src/admin/getsessions.go

@@ -3,7 +3,7 @@ package admin
 import (
 	"encoding/hex"
 	"net"
-	"sort"
+	"slices"
 	"strings"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
@@ -23,7 +23,7 @@ type SessionEntry struct {
 	Uptime    float64  `json:"uptime"`
 }
 
-func (a *AdminSocket) getSessionsHandler(req *GetSessionsRequest, res *GetSessionsResponse) error {
+func (a *AdminSocket) getSessionsHandler(_ *GetSessionsRequest, res *GetSessionsResponse) error {
 	sessions := a.core.GetSessions()
 	res.Sessions = make([]SessionEntry, 0, len(sessions))
 	for _, s := range sessions {
@@ -36,8 +36,8 @@ func (a *AdminSocket) getSessionsHandler(req *GetSessionsRequest, res *GetSessio
 			Uptime:    s.Uptime.Seconds(),
 		})
 	}
-	sort.SliceStable(res.Sessions, func(i, j int) bool {
-		return strings.Compare(res.Sessions[i].PublicKey, res.Sessions[j].PublicKey) < 0
+	slices.SortStableFunc(res.Sessions, func(a, b SessionEntry) int {
+		return strings.Compare(a.PublicKey, b.PublicKey)
 	})
 	return nil
 }

src/admin/gettree.go

@@ -3,7 +3,7 @@ package admin
 import (
 	"encoding/hex"
 	"net"
-	"sort"
+	"slices"
 	"strings"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
@@ -20,11 +20,9 @@ type TreeEntry struct {
 	PublicKey string `json:"key"`
 	Parent    string `json:"parent"`
 	Sequence  uint64 `json:"sequence"`
-	//Port      uint64 `json:"port"`
-	//Rest      uint64 `json:"rest"`
 }
 
-func (a *AdminSocket) getTreeHandler(req *GetTreeRequest, res *GetTreeResponse) error {
+func (a *AdminSocket) getTreeHandler(_ *GetTreeRequest, res *GetTreeResponse) error {
 	tree := a.core.GetTree()
 	res.Tree = make([]TreeEntry, 0, len(tree))
 	for _, d := range tree {
@@ -34,12 +32,10 @@ func (a *AdminSocket) getTreeHandler(req *GetTreeRequest, res *GetTreeResponse)
 			PublicKey: hex.EncodeToString(d.Key[:]),
 			Parent:    hex.EncodeToString(d.Parent[:]),
 			Sequence:  d.Sequence,
-			//Port:      d.Port,
-			//Rest:      d.Rest,
 		})
 	}
-	sort.SliceStable(res.Tree, func(i, j int) bool {
-		return strings.Compare(res.Tree[i].PublicKey, res.Tree[j].PublicKey) < 0
+	slices.SortStableFunc(res.Tree, func(a, b TreeEntry) int {
+		return strings.Compare(a.PublicKey, b.PublicKey)
 	})
 	return nil
 }

src/admin/removepeer.go

@@ -12,7 +12,7 @@ type RemovePeerRequest struct {
 
 type RemovePeerResponse struct{}
 
-func (a *AdminSocket) removePeerHandler(req *RemovePeerRequest, res *RemovePeerResponse) error {
+func (a *AdminSocket) removePeerHandler(req *RemovePeerRequest, _ *RemovePeerResponse) error {
 	u, err := url.Parse(req.Uri)
 	if err != nil {
 		return fmt.Errorf("unable to parse peering URI: %w", err)

src/core/api.go

@@ -30,6 +30,7 @@ type PeerInfo struct {
 	Coords        []uint64
 	Port          uint64
 	Priority      uint8
+	Cost          uint64
 	RXBytes       uint64
 	TXBytes       uint64
 	Uptime        time.Duration
@@ -94,6 +95,7 @@ func (c *Core) GetPeers() []PeerInfo {
 				peerinfo.Port = p.Port
 				peerinfo.Priority = p.Priority
 				peerinfo.Latency = p.Latency
+				peerinfo.Cost = p.Cost
 			}
 			peers = append(peers, peerinfo)
 		}
@@ -148,7 +150,14 @@ func (c *Core) GetSessions() []SessionInfo {
 // parsed from a string of the form e.g. "tcp://a.b.c.d:e". In the case of a
 // link-local address, the interface should be provided as the second argument.
 func (c *Core) Listen(u *url.URL, sintf string) (*Listener, error) {
-	return c.links.listen(u, sintf)
+	return c.links.listen(u, sintf, false)
+}
+
+// ListenLocal starts a listener, like the Listen function, but is used for
+// more trustworthy situations where you want to ignore AllowedPublicKeys, i.e.
+// with multicast listeners.
+func (c *Core) ListenLocal(u *url.URL, sintf string) (*Listener, error) {
+	return c.links.listen(u, sintf, true)
 }
 
 // Address gets the IPv6 address of the Yggdrasil node. This is always a /128

src/core/core.go

@@ -127,7 +127,7 @@ func New(cert *tls.Certificate, logger Logger, opts ...SetupOption) (*Core, erro
 			c.log.Errorf("Invalid listener URI %q specified, ignoring\n", listenaddr)
 			continue
 		}
-		if _, err = c.links.listen(u, ""); err != nil {
+		if _, err = c.links.listen(u, "", false); err != nil {
 			c.log.Errorf("Failed to start listener %q: %s\n", listenaddr, err)
 		}
 	}

src/core/core_test.go

@@ -25,6 +25,27 @@ func GetLoggerWithPrefix(prefix string, verbose bool) *log.Logger {
 	return l
 }
 
+func require_NoError(t *testing.T, err error) {
+	t.Helper()
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func require_Equal[T comparable](t *testing.T, a, b T) {
+	t.Helper()
+	if a != b {
+		t.Fatalf("%v != %v", a, b)
+	}
+}
+
+func require_True(t *testing.T, a bool) {
+	t.Helper()
+	if !a {
+		t.Fatal("expected true")
+	}
+}
+
 // CreateAndConnectTwo creates two nodes. nodeB connects to nodeA.
 // Verbosity flag is passed to logger.
 func CreateAndConnectTwo(t testing.TB, verbose bool) (nodeA *Core, nodeB *Core) {
@@ -201,3 +222,69 @@ func BenchmarkCore_Start_Transfer(b *testing.B) {
 	}
 	<-done
 }
+
+func TestAllowedPublicKeys(t *testing.T) {
+	logger := GetLoggerWithPrefix("", false)
+	cfgA, cfgB := config.GenerateConfig(), config.GenerateConfig()
+	require_NoError(t, cfgA.GenerateSelfSignedCertificate())
+	require_NoError(t, cfgB.GenerateSelfSignedCertificate())
+
+	nodeA, err := New(cfgA.Certificate, logger, AllowedPublicKey("abcdef"))
+	require_NoError(t, err)
+	defer nodeA.Stop()
+
+	nodeB, err := New(cfgB.Certificate, logger)
+	require_NoError(t, err)
+	defer nodeB.Stop()
+
+	u, err := url.Parse("tcp://localhost:0")
+	require_NoError(t, err)
+
+	l, err := nodeA.Listen(u, "")
+	require_NoError(t, err)
+
+	u, err = url.Parse("tcp://" + l.Addr().String())
+	require_NoError(t, err)
+
+	require_NoError(t, nodeB.AddPeer(u, ""))
+
+	time.Sleep(time.Second)
+
+	peers := nodeB.GetPeers()
+	require_Equal(t, len(peers), 1)
+	require_True(t, !peers[0].Up)
+	require_True(t, peers[0].LastError != nil)
+}
+
+func TestAllowedPublicKeysLocal(t *testing.T) {
+	logger := GetLoggerWithPrefix("", false)
+	cfgA, cfgB := config.GenerateConfig(), config.GenerateConfig()
+	require_NoError(t, cfgA.GenerateSelfSignedCertificate())
+	require_NoError(t, cfgB.GenerateSelfSignedCertificate())
+
+	nodeA, err := New(cfgA.Certificate, logger, AllowedPublicKey("abcdef"))
+	require_NoError(t, err)
+	defer nodeA.Stop()
+
+	nodeB, err := New(cfgB.Certificate, logger)
+	require_NoError(t, err)
+	defer nodeB.Stop()
+
+	u, err := url.Parse("tcp://localhost:0")
+	require_NoError(t, err)
+
+	l, err := nodeA.ListenLocal(u, "")
+	require_NoError(t, err)
+
+	u, err = url.Parse("tcp://" + l.Addr().String())
+	require_NoError(t, err)
+
+	require_NoError(t, nodeB.AddPeer(u, ""))
+
+	time.Sleep(time.Second)
+
+	peers := nodeB.GetPeers()
+	require_Equal(t, len(peers), 1)
+	require_True(t, peers[0].Up)
+	require_True(t, peers[0].LastError == nil)
+}

src/core/link.go

@@ -4,10 +4,10 @@ import (
 	"bytes"
 	"context"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"io"
 	"net"
-	"net/netip"
 	"net/url"
 	"strconv"
 	"strings"
@@ -38,8 +38,11 @@ type links struct {
 	unix  *linkUNIX  // UNIX interface support
 	socks *linkSOCKS // SOCKS interface support
 	quic  *linkQUIC  // QUIC interface support
+	ws    *linkWS    // WS interface support
+	wss   *linkWSS   // WSS interface support
 	// _links can only be modified safely from within the links actor
-	_links map[linkInfo]*link // *link is nil if connection in progress
+	_links     map[linkInfo]*link // *link is nil if connection in progress
+	_listeners map[*Listener]context.CancelFunc
 }
 
 type linkProtocol interface {
@@ -84,13 +87,6 @@ func (l *Listener) Addr() net.Addr {
 	return l.listener.Addr()
 }
 
-func (l *Listener) Close() error {
-	l.Cancel()
-	err := l.listener.Close()
-	<-l.ctx.Done()
-	return err
-}
-
 func (l *links) init(c *Core) error {
 	l.core = c
 	l.tcp = l.newLinkTCP()
@@ -98,33 +94,23 @@ func (l *links) init(c *Core) error {
 	l.unix = l.newLinkUNIX()
 	l.socks = l.newLinkSOCKS()
 	l.quic = l.newLinkQUIC()
+	l.ws = l.newLinkWS()
+	l.wss = l.newLinkWSS()
 	l._links = make(map[linkInfo]*link)
-
-	var listeners []ListenAddress
-	phony.Block(c, func() {
-		listeners = make([]ListenAddress, 0, len(c.config._listeners))
-		for listener := range c.config._listeners {
-			listeners = append(listeners, listener)
-		}
-	})
+	l._listeners = make(map[*Listener]context.CancelFunc)
 
 	return nil
 }
 
 func (l *links) shutdown() {
-	phony.Block(l.tcp, func() {
-		for l := range l.tcp._listeners {
-			_ = l.Close()
+	phony.Block(l, func() {
+		for listener := range l._listeners {
+			_ = listener.listener.Close()
 		}
-	})
-	phony.Block(l.tls, func() {
-		for l := range l.tls._listeners {
-			_ = l.Close()
-		}
-	})
-	phony.Block(l.unix, func() {
-		for l := range l.unix._listeners {
-			_ = l.Close()
+		for _, link := range l._links {
+			if link._conn != nil {
+				_ = link._conn.Close()
+			}
 		}
 	})
 }
@@ -137,7 +123,7 @@ const ErrLinkAlreadyConfigured = linkError("peer is already configured")
 const ErrLinkNotConfigured = linkError("peer is not configured")
 const ErrLinkPriorityInvalid = linkError("priority value is invalid")
 const ErrLinkPinnedKeyInvalid = linkError("pinned public key is invalid")
-const ErrLinkPasswordInvalid = linkError("password is invalid")
+const ErrLinkPasswordInvalid = linkError("invalid password supplied")
 const ErrLinkUnrecognisedSchema = linkError("link schema unknown")
 const ErrLinkMaxBackoffInvalid = linkError("max backoff duration invalid")
 
@@ -350,7 +336,7 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
 
 				// Give the connection to the handler. The handler will block
 				// for the lifetime of the connection.
-				if err = l.handler(linkType, options, lc, resetBackoff); err != nil && err != io.EOF {
+				if err = l.handler(linkType, options, lc, resetBackoff, false); err != nil && err != io.EOF {
 					l.core.log.Debugf("Link %s error: %s\n", info.uri, err)
 				}
 
@@ -360,9 +346,11 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
 				_ = lc.Close()
 				phony.Block(l, func() {
 					state._conn = nil
-					if state._err = err; state._err != nil {
-						state._errtime = time.Now()
+					if err == nil {
+						err = fmt.Errorf("remote side closed the connection")
 					}
+					state._err = err
+					state._errtime = time.Now()
 				})
 
 				// If the link is persistently configured, back off if needed
@@ -371,15 +359,16 @@ func (l *links) add(u *url.URL, sintf string, linkType linkType) error {
 					if backoffNow() {
 						continue
 					}
-					return
 				}
+				// Ephemeral or incoming connections don't reconnect.
+				return
 			}
 		}()
 	})
 	return retErr
 }
 
-func (l *links) remove(u *url.URL, sintf string, linkType linkType) error {
+func (l *links) remove(u *url.URL, sintf string, _ linkType) error {
 	var retErr error
 	phony.Block(l, func() {
 		// Generate the link info and see whether we think we already
@@ -406,7 +395,7 @@ func (l *links) remove(u *url.URL, sintf string, linkType linkType) error {
 	return retErr
 }
 
-func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
+func (l *links) listen(u *url.URL, sintf string, local bool) (*Listener, error) {
 	ctx, cancel := context.WithCancel(l.core.ctx)
 	var protocol linkProtocol
 	switch strings.ToLower(u.Scheme) {
@@ -418,6 +407,10 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 		protocol = l.unix
 	case "quic":
 		protocol = l.quic
+	case "ws":
+		protocol = l.ws
+	case "wss":
+		protocol = l.wss
 	default:
 		cancel()
 		return nil, ErrLinkUnrecognisedSchema
@@ -430,7 +423,10 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 	li := &Listener{
 		listener: listener,
 		ctx:      ctx,
-		Cancel:   cancel,
+		Cancel: func() {
+			cancel()
+			_ = listener.Close()
+		},
 	}
 
 	var options linkOptions
@@ -448,11 +444,18 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 		options.password = []byte(p)
 	}
 
+	phony.Block(l, func() {
+		l._listeners[li] = cancel
+	})
+
 	go func() {
-		l.core.log.Infof("%s listener started on %s", strings.ToUpper(u.Scheme), listener.Addr())
-		defer l.core.log.Infof("%s listener stopped on %s", strings.ToUpper(u.Scheme), listener.Addr())
+		l.core.log.Infof("%s listener started on %s", strings.ToUpper(u.Scheme), li.listener.Addr())
+		defer l.core.log.Infof("%s listener stopped on %s", strings.ToUpper(u.Scheme), li.listener.Addr())
+		defer phony.Block(l, func() {
+			delete(l._listeners, li)
+		})
 		for {
-			conn, err := listener.Accept()
+			conn, err := li.listener.Accept()
 			if err != nil {
 				return
 			}
@@ -508,13 +511,22 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 					// Store the state of the link so that it can be queried later.
 					l._links[info] = state
 				})
+				defer phony.Block(l, func() {
+					if l._links[info] == state {
+						delete(l._links, info)
+					}
+				})
 				if lc == nil {
 					return
 				}
 
 				// Give the connection to the handler. The handler will block
 				// for the lifetime of the connection.
-				if err = l.handler(linkTypeIncoming, options, lc, nil); err != nil && err != io.EOF {
+				switch err = l.handler(linkTypeIncoming, options, lc, nil, local); {
+				case err == nil:
+				case errors.Is(err, io.EOF):
+				case errors.Is(err, net.ErrClosed):
+				default:
 					l.core.log.Debugf("Link %s error: %s\n", u.Host, err)
 				}
 
@@ -522,11 +534,6 @@ func (l *links) listen(u *url.URL, sintf string) (*Listener, error) {
 				// try to close the underlying socket just in case and then
 				// drop the link state.
 				_ = lc.Close()
-				phony.Block(l, func() {
-					if l._links[info] == state {
-						delete(l._links, info)
-					}
-				})
 			}(conn)
 		}
 	}()
@@ -546,13 +553,17 @@ func (l *links) connect(ctx context.Context, u *url.URL, info linkInfo, options
 		dialer = l.unix
 	case "quic":
 		dialer = l.quic
+	case "ws":
+		dialer = l.ws
+	case "wss":
+		dialer = l.wss
 	default:
 		return nil, ErrLinkUnrecognisedSchema
 	}
 	return dialer.dial(ctx, u, info, options)
 }
 
-func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, success func()) error {
+func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, success func(), local bool) error {
 	meta := version_getBaseMetadata()
 	meta.publicKey = l.core.public
 	meta.priority = options.priority
@@ -567,7 +578,7 @@ func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, s
 	switch {
 	case err != nil:
 		return fmt.Errorf("write handshake: %w", err)
-	case err == nil && n != len(metaBytes):
+	case n != len(metaBytes):
 		return fmt.Errorf("incomplete handshake send")
 	}
 	meta = version_metadata{}
@@ -595,19 +606,21 @@ func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, s
 		}
 	}
 	// Check if we're authorized to connect to this key / IP
-	var allowed map[[32]byte]struct{}
-	phony.Block(l.core, func() {
-		allowed = l.core.config._allowedPublicKeys
-	})
-	isallowed := len(allowed) == 0
-	for k := range allowed {
-		if bytes.Equal(k[:], meta.publicKey) {
-			isallowed = true
-			break
+	if !local {
+		var allowed map[[32]byte]struct{}
+		phony.Block(l.core, func() {
+			allowed = l.core.config._allowedPublicKeys
+		})
+		isallowed := len(allowed) == 0
+		for k := range allowed {
+			if bytes.Equal(k[:], meta.publicKey) {
+				isallowed = true
+				break
+			}
+		}
+		if linkType == linkTypeIncoming && !isallowed {
+			return fmt.Errorf("node public key %q is not in AllowedPublicKeys", hex.EncodeToString(meta.publicKey))
 		}
-	}
-	if linkType == linkTypeIncoming && !isallowed {
-		return fmt.Errorf("node public key %q is not in AllowedPublicKeys", hex.EncodeToString(meta.publicKey))
 	}
 
 	dir := "outbound"
@@ -636,21 +649,11 @@ func (l *links) handler(linkType linkType, options linkOptions, conn net.Conn, s
 		l.core.log.Infof("Disconnected %s: %s, source %s; error: %s",
 			dir, remoteStr, localStr, err)
 	}
-	return nil
+	return err
 }
 
 func urlForLinkInfo(u url.URL) url.URL {
 	u.RawQuery = ""
-	if host, _, err := net.SplitHostPort(u.Host); err == nil {
-		if addr, err := netip.ParseAddr(host); err == nil {
-			// For peers that look like multicast peers (i.e.
-			// link-local addresses), we will ignore the port number,
-			// otherwise we might open multiple connections to them.
-			if addr.IsLinkLocalUnicast() {
-				u.Host = fmt.Sprintf("[%s]", addr.String())
-			}
-		}
-	}
 	return u
 }
 

src/core/link_tcp.go

@@ -15,7 +15,6 @@ type linkTCP struct {
 	phony.Inbox
 	*links
 	listenconfig *net.ListenConfig
-	_listeners   map[*Listener]context.CancelFunc
 }
 
 func (l *links) newLinkTCP() *linkTCP {
@@ -24,7 +23,6 @@ func (l *links) newLinkTCP() *linkTCP {
 		listenconfig: &net.ListenConfig{
 			KeepAlive: -1,
 		},
-		_listeners: map[*Listener]context.CancelFunc{},
 	}
 	lt.listenconfig.Control = lt.tcpContext
 	return lt

src/core/link_tcp_darwin.go

@@ -28,6 +28,6 @@ func (t *linkTCP) tcpContext(network, address string, c syscall.RawConn) error {
 	}
 }
 
-func (t *linkTCP) getControl(sintf string) func(string, string, syscall.RawConn) error {
+func (t *linkTCP) getControl(_ string) func(string, string, syscall.RawConn) error {
 	return t.tcpContext
 }

src/core/link_tls.go

@@ -13,10 +13,9 @@ import (
 type linkTLS struct {
 	phony.Inbox
 	*links
-	tcp        *linkTCP
-	listener   *net.ListenConfig
-	config     *tls.Config
-	_listeners map[*Listener]context.CancelFunc
+	tcp      *linkTCP
+	listener *net.ListenConfig
+	config   *tls.Config
 }
 
 func (l *links) newLinkTLS(tcp *linkTCP) *linkTLS {
@@ -27,8 +26,7 @@ func (l *links) newLinkTLS(tcp *linkTCP) *linkTLS {
 			Control:   tcp.tcpContext,
 			KeepAlive: -1,
 		},
-		config:     l.core.config.tls.Clone(),
-		_listeners: map[*Listener]context.CancelFunc{},
+		config: l.core.config.tls.Clone(),
 	}
 	return lt
 }

src/core/link_unix.go

@@ -12,9 +12,8 @@ import (
 type linkUNIX struct {
 	phony.Inbox
 	*links
-	dialer     *net.Dialer
-	listener   *net.ListenConfig
-	_listeners map[*Listener]context.CancelFunc
+	dialer   *net.Dialer
+	listener *net.ListenConfig
 }
 
 func (l *links) newLinkUNIX() *linkUNIX {
@@ -27,7 +26,6 @@ func (l *links) newLinkUNIX() *linkUNIX {
 		listener: &net.ListenConfig{
 			KeepAlive: -1,
 		},
-		_listeners: map[*Listener]context.CancelFunc{},
 	}
 	return lt
 }

src/core/link_ws.go

@@ -0,0 +1,127 @@
+package core
+
+import (
+	"context"
+	"net"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/Arceliar/phony"
+	"github.com/coder/websocket"
+)
+
+type linkWS struct {
+	phony.Inbox
+	*links
+	listenconfig *net.ListenConfig
+}
+
+type linkWSConn struct {
+	net.Conn
+}
+
+type linkWSListener struct {
+	ch         chan *linkWSConn
+	ctx        context.Context
+	httpServer *http.Server
+	listener   net.Listener
+}
+
+type wsServer struct {
+	ch  chan *linkWSConn
+	ctx context.Context
+}
+
+func (l *linkWSListener) Accept() (net.Conn, error) {
+	qs := <-l.ch
+	if qs == nil {
+		return nil, context.Canceled
+	}
+	return qs, nil
+}
+
+func (l *linkWSListener) Addr() net.Addr {
+	return l.listener.Addr()
+}
+
+func (l *linkWSListener) Close() error {
+	if err := l.httpServer.Shutdown(l.ctx); err != nil {
+		return err
+	}
+	return l.listener.Close()
+}
+
+func (s *wsServer) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path == "/health" || r.URL.Path == "/healthz" {
+		w.WriteHeader(http.StatusOK)
+		_, _ = w.Write([]byte("OK"))
+		return
+	}
+
+	c, err := websocket.Accept(w, r, &websocket.AcceptOptions{
+		Subprotocols: []string{"ygg-ws"},
+	})
+	if err != nil {
+		return
+	}
+
+	if c.Subprotocol() != "ygg-ws" {
+		c.Close(websocket.StatusPolicyViolation, "client must speak the ygg-ws subprotocol")
+		return
+	}
+
+	s.ch <- &linkWSConn{
+		Conn: websocket.NetConn(s.ctx, c, websocket.MessageBinary),
+	}
+}
+
+func (l *links) newLinkWS() *linkWS {
+	lt := &linkWS{
+		links: l,
+		listenconfig: &net.ListenConfig{
+			KeepAlive: -1,
+		},
+	}
+	return lt
+}
+
+func (l *linkWS) dial(ctx context.Context, url *url.URL, info linkInfo, options linkOptions) (net.Conn, error) {
+	wsconn, _, err := websocket.Dial(ctx, url.String(), &websocket.DialOptions{
+		Subprotocols: []string{"ygg-ws"},
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &linkWSConn{
+		Conn: websocket.NetConn(ctx, wsconn, websocket.MessageBinary),
+	}, nil
+}
+
+func (l *linkWS) listen(ctx context.Context, url *url.URL, _ string) (net.Listener, error) {
+	nl, err := l.listenconfig.Listen(ctx, "tcp", url.Host)
+	if err != nil {
+		return nil, err
+	}
+
+	ch := make(chan *linkWSConn)
+
+	httpServer := &http.Server{
+		Handler: &wsServer{
+			ch:  ch,
+			ctx: ctx,
+		},
+		BaseContext:  func(_ net.Listener) context.Context { return ctx },
+		ReadTimeout:  time.Second * 10,
+		WriteTimeout: time.Second * 10,
+	}
+
+	lwl := &linkWSListener{
+		ch:         ch,
+		ctx:        ctx,
+		httpServer: httpServer,
+		listener:   nl,
+	}
+	go lwl.httpServer.Serve(nl) // nolint:errcheck
+	return lwl, nil
+}

src/core/link_wss.go

@@ -0,0 +1,43 @@
+package core
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/url"
+
+	"github.com/Arceliar/phony"
+	"github.com/coder/websocket"
+)
+
+type linkWSS struct {
+	phony.Inbox
+	*links
+}
+
+type linkWSSConn struct {
+	net.Conn
+}
+
+func (l *links) newLinkWSS() *linkWSS {
+	lwss := &linkWSS{
+		links: l,
+	}
+	return lwss
+}
+
+func (l *linkWSS) dial(ctx context.Context, url *url.URL, info linkInfo, options linkOptions) (net.Conn, error) {
+	wsconn, _, err := websocket.Dial(ctx, url.String(), &websocket.DialOptions{
+		Subprotocols: []string{"ygg-ws"},
+	})
+	if err != nil {
+		return nil, err
+	}
+	return &linkWSSConn{
+		Conn: websocket.NetConn(ctx, wsconn, websocket.MessageBinary),
+	}, nil
+}
+
+func (l *linkWSS) listen(ctx context.Context, url *url.URL, _ string) (net.Listener, error) {
+	return nil, fmt.Errorf("WSS listener not supported, use WS listener behind reverse proxy instead")
+}

src/core/version.go

@@ -8,7 +8,6 @@ import (
 	"bytes"
 	"crypto/ed25519"
 	"encoding/binary"
-	"fmt"
 	"io"
 
 	"golang.org/x/crypto/blake2b"
@@ -38,6 +37,16 @@ const (
 	metaPriority                   // uint8
 )
 
+type handshakeError string
+
+func (e handshakeError) Error() string { return string(e) }
+
+const ErrHandshakeInvalidPreamble = handshakeError("invalid handshake, remote side is not Yggdrasil")
+const ErrHandshakeInvalidLength = handshakeError("invalid handshake length, possible version mismatch")
+const ErrHandshakeInvalidPassword = handshakeError("invalid password supplied, check your config")
+const ErrHandshakeHashFailure = handshakeError("invalid hash length")
+const ErrHandshakeIncorrectPassword = handshakeError("password does not match remote side")
+
 // Gets a base metadata with no keys set, but with the correct version numbers.
 func version_getBaseMetadata() version_metadata {
 	return version_metadata{
@@ -77,7 +86,7 @@ func (m *version_metadata) encode(privateKey ed25519.PrivateKey, password []byte
 		return nil, err
 	}
 	if n != ed25519.PublicKeySize {
-		return nil, fmt.Errorf("hash writer only wrote %d bytes", n)
+		return nil, ErrHandshakeHashFailure
 	}
 	hash := hasher.Sum(nil)
 	bs = append(bs, ed25519.Sign(privateKey, hash)...)
@@ -94,11 +103,11 @@ func (m *version_metadata) decode(r io.Reader, password []byte) error {
 	}
 	meta := [4]byte{'m', 'e', 't', 'a'}
 	if !bytes.Equal(bh[:4], meta[:]) {
-		return fmt.Errorf("invalid handshake preamble")
+		return ErrHandshakeInvalidPreamble
 	}
 	hl := binary.BigEndian.Uint16(bh[4:6])
 	if hl < ed25519.SignatureSize {
-		return fmt.Errorf("invalid handshake length")
+		return ErrHandshakeInvalidLength
 	}
 	bs := make([]byte, hl)
 	if _, err := io.ReadFull(r, bs); err != nil {
@@ -132,15 +141,15 @@ func (m *version_metadata) decode(r io.Reader, password []byte) error {
 
 	hasher, err := blake2b.New512(password)
 	if err != nil {
-		return fmt.Errorf("invalid password supplied")
+		return ErrHandshakeInvalidPassword
 	}
 	n, err := hasher.Write(m.publicKey)
 	if err != nil || n != ed25519.PublicKeySize {
-		return fmt.Errorf("failed to generate hash")
+		return ErrHandshakeHashFailure
 	}
 	hash := hasher.Sum(nil)
 	if !ed25519.Verify(m.publicKey, hash, sig) {
-		return fmt.Errorf("password is incorrect")
+		return ErrHandshakeIncorrectPassword
 	}
 	return nil
 }

src/multicast/admin.go

@@ -11,7 +11,7 @@ type GetMulticastInterfacesResponse struct {
 	Interfaces []string `json:"multicast_interfaces"`
 }
 
-func (m *Multicast) getMulticastInterfacesHandler(req *GetMulticastInterfacesRequest, res *GetMulticastInterfacesResponse) error {
+func (m *Multicast) getMulticastInterfacesHandler(_ *GetMulticastInterfacesRequest, res *GetMulticastInterfacesResponse) error {
 	res.Interfaces = []string{}
 	for _, v := range m.Interfaces() {
 		res.Interfaces = append(res.Interfaces, v.Name)

src/multicast/multicast.go

@@ -9,10 +9,12 @@ import (
 	"math/rand"
 	"net"
 	"net/url"
+	"sync/atomic"
 	"time"
 
 	"github.com/Arceliar/phony"
 	"github.com/gologme/log"
+	"github.com/wlynxg/anet"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/core"
 	"golang.org/x/crypto/blake2b"
@@ -28,7 +30,7 @@ type Multicast struct {
 	core        *core.Core
 	log         *log.Logger
 	sock        *ipv6.PacketConn
-	_isOpen     bool
+	running     atomic.Bool
 	_listeners  map[string]*listenerInfo
 	_interfaces map[string]*interfaceInfo
 	_timer      *time.Timer
@@ -79,7 +81,7 @@ func New(core *core.Core, log *log.Logger, opts ...SetupOption) (*Multicast, err
 }
 
 func (m *Multicast) _start() error {
-	if m._isOpen {
+	if !m.running.CompareAndSwap(false, true) {
 		return fmt.Errorf("multicast module is already started")
 	}
 	var anyEnabled bool
@@ -87,12 +89,14 @@ func (m *Multicast) _start() error {
 		anyEnabled = anyEnabled || intf.Beacon || intf.Listen
 	}
 	if !anyEnabled {
+		m.running.Store(false)
 		return nil
 	}
 	m.log.Debugln("Starting multicast module")
 	defer m.log.Debugln("Started multicast module")
 	addr, err := net.ResolveUDPAddr("udp", string(m.config._groupAddr))
 	if err != nil {
+		m.running.Store(false)
 		return err
 	}
 	listenString := fmt.Sprintf("[::]:%v", addr.Port)
@@ -101,6 +105,7 @@ func (m *Multicast) _start() error {
 	}
 	conn, err := lc.ListenPacket(context.Background(), "udp6", listenString)
 	if err != nil {
+		m.running.Store(false)
 		return err
 	}
 	m.sock = ipv6.NewPacketConn(conn)
@@ -108,7 +113,6 @@ func (m *Multicast) _start() error {
 		// Windows can't set this flag, so we need to handle it in other ways
 	}
 
-	m._isOpen = true
 	go m.listen()
 	m.Act(nil, m._multicastStarted)
 	m.Act(nil, m._announce)
@@ -118,11 +122,7 @@ func (m *Multicast) _start() error {
 
 // IsStarted returns true if the module has been started.
 func (m *Multicast) IsStarted() bool {
-	var isOpen bool
-	phony.Block(m, func() {
-		isOpen = m._isOpen
-	})
-	return isOpen
+	return m.running.Load()
 }
 
 // Stop stops the multicast module.
@@ -136,8 +136,10 @@ func (m *Multicast) Stop() error {
 }
 
 func (m *Multicast) _stop() error {
+	if !m.running.CompareAndSwap(true, false) {
+		return nil
+	}
 	m.log.Infoln("Stopping multicast module")
-	m._isOpen = false
 	if m.sock != nil {
 		m.sock.Close()
 	}
@@ -147,7 +149,8 @@ func (m *Multicast) _stop() error {
 func (m *Multicast) _updateInterfaces() {
 	interfaces := m._getAllowedInterfaces()
 	for name, info := range interfaces {
-		addrs, err := info.iface.Addrs()
+		// 'anet' package is used here to avoid https://github.com/golang/go/issues/40569
+		addrs, err := anet.InterfaceAddrsByInterface(&info.iface)
 		if err != nil {
 			m.log.Warnf("Failed up get addresses for interface %s: %s", name, err)
 			delete(interfaces, name)
@@ -155,6 +158,7 @@ func (m *Multicast) _updateInterfaces() {
 		}
 		info.addrs = addrs
 		interfaces[name] = info
+		m.log.Debugf("Discovered addresses for interface %s: %s", name, addrs)
 	}
 	m._interfaces = interfaces
 }
@@ -173,10 +177,11 @@ func (m *Multicast) Interfaces() map[string]net.Interface {
 func (m *Multicast) _getAllowedInterfaces() map[string]*interfaceInfo {
 	interfaces := make(map[string]*interfaceInfo)
 	// Ask the system for network interfaces
-	allifaces, err := net.Interfaces()
+	// 'anet' package is used here to avoid https://github.com/golang/go/issues/40569
+	allifaces, err := anet.Interfaces()
 	if err != nil {
 		// Don't panic, since this may be from e.g. too many open files (from too much connection spam)
-		// TODO? log something
+		m.log.Debugf("Failed to get interfaces: %s", err)
 		return nil
 	}
 	// Work out which interfaces to announce on
@@ -185,6 +190,8 @@ func (m *Multicast) _getAllowedInterfaces() map[string]*interfaceInfo {
 		switch {
 		case iface.Flags&net.FlagUp == 0:
 			continue // Ignore interfaces that are down
+		case iface.Flags&net.FlagRunning == 0:
+			continue // Ignore interfaces that are not running
 		case iface.Flags&net.FlagMulticast == 0:
 			continue // Ignore non-multicast interfaces
 		case iface.Flags&net.FlagPointToPoint != 0:
@@ -233,7 +240,7 @@ func (m *Multicast) AnnounceNow() {
 }
 
 func (m *Multicast) _announce() {
-	if !m._isOpen {
+	if !m.running.Load() {
 		return
 	}
 	m._updateInterfaces()
@@ -250,7 +257,7 @@ func (m *Multicast) _announce() {
 	for name, info := range m._listeners {
 		// Prepare our stop function!
 		stop := func() {
-			info.listener.Close()
+			info.listener.Cancel()
 			delete(m._listeners, name)
 			m.log.Debugln("No longer multicasting on", name)
 		}
@@ -320,7 +327,7 @@ func (m *Multicast) _announce() {
 					Host:     net.JoinHostPort(addrIP.String(), fmt.Sprintf("%d", info.port)),
 					RawQuery: v.Encode(),
 				}
-				if li, err := m.core.Listen(u, iface.Name); err == nil {
+				if li, err := m.core.ListenLocal(u, iface.Name); err == nil {
 					m.log.Debugln("Started multicasting on", iface.Name)
 					// Store the listener so that we can stop it later if needed
 					linfo = &listenerInfo{listener: li, time: time.Now(), port: info.port}
@@ -376,6 +383,9 @@ func (m *Multicast) listen() {
 	bs := make([]byte, 2048)
 	hb := make([]byte, 0, blake2b.Size) // Reused to reduce hash allocations
 	for {
+		if !m.running.Load() {
+			return
+		}
 		n, rcm, fromAddr, err := m.sock.ReadFrom(bs)
 		if err != nil {
 			if !m.IsStarted() {

src/multicast/multicast_darwin_cgo.go

@@ -31,7 +31,7 @@ import (
 )
 
 func (m *Multicast) _multicastStarted() {
-	if !m._isOpen {
+	if !m.running.Load() {
 		return
 	}
 	C.StopAWDLBrowsing()

src/tun/iface.go

@@ -1,42 +1,70 @@
 package tun
 
-const TUN_OFFSET_BYTES = 4
+import (
+	"errors"
+
+	wgtun "golang.zx2c4.com/wireguard/tun"
+)
+
+const TUN_OFFSET_BYTES = 80 // sizeof(virtio_net_hdr)
 
 func (tun *TunAdapter) read() {
-	var buf [TUN_OFFSET_BYTES + 65535]byte
+	vs := tun.iface.BatchSize()
+	bufs := make([][]byte, vs)
+	sizes := make([]int, vs)
+	for i := range bufs {
+		bufs[i] = make([]byte, TUN_OFFSET_BYTES+65535)
+	}
 	for {
-		n, err := tun.iface.Read(buf[:], TUN_OFFSET_BYTES)
-		if n <= TUN_OFFSET_BYTES || err != nil {
-			tun.log.Errorln("Error reading TUN:", err)
-			ferr := tun.iface.Flush()
-			if ferr != nil {
-				tun.log.Errorln("Unable to flush packets:", ferr)
+		n, err := tun.iface.Read(bufs, sizes, TUN_OFFSET_BYTES)
+		if err != nil {
+			if errors.Is(err, wgtun.ErrTooManySegments) {
+				tun.log.Debugln("TUN segments dropped: %v", err)
+				continue
 			}
+			tun.log.Errorln("Error reading TUN:", err)
 			return
 		}
-		begin := TUN_OFFSET_BYTES
-		end := begin + n
-		bs := buf[begin:end]
-		if _, err := tun.rwc.Write(bs); err != nil {
-			tun.log.Debugln("Unable to send packet:", err)
+		for i, b := range bufs[:n] {
+			if _, err := tun.rwc.Write(b[TUN_OFFSET_BYTES : TUN_OFFSET_BYTES+sizes[i]]); err != nil {
+				tun.log.Debugln("Unable to send packet:", err)
+			}
 		}
 	}
 }
 
-func (tun *TunAdapter) write() {
-	var buf [TUN_OFFSET_BYTES + 65535]byte
+func (tun *TunAdapter) queue() {
 	for {
-		bs := buf[TUN_OFFSET_BYTES:]
-		n, err := tun.rwc.Read(bs)
+		p := bufPool.Get().([]byte)[:bufPoolSize]
+		n, err := tun.rwc.Read(p)
 		if err != nil {
 			tun.log.Errorln("Exiting TUN writer due to core read error:", err)
 			return
 		}
+		tun.ch <- p[:n]
+	}
+}
+
+func (tun *TunAdapter) write() {
+	vs := cap(tun.ch)
+	bufs := make([][]byte, vs)
+	for i := range bufs {
+		bufs[i] = make([]byte, TUN_OFFSET_BYTES+65535)
+	}
+	for {
+		n := len(tun.ch)
+		if n == 0 {
+			n = 1 // Nothing queued up yet, wait for it instead
+		}
+		for i := 0; i < n; i++ {
+			msg := <-tun.ch
+			bufs[i] = append(bufs[i][:TUN_OFFSET_BYTES], msg...)
+			bufPool.Put(msg) // nolint:staticcheck
+		}
 		if !tun.isEnabled {
 			continue // Nothing to do, the tun isn't enabled
 		}
-		bs = buf[:TUN_OFFSET_BYTES+n]
-		if _, err = tun.iface.Write(bs, TUN_OFFSET_BYTES); err != nil {
+		if _, err := tun.iface.Write(bufs[:n], TUN_OFFSET_BYTES); err != nil {
 			tun.Act(nil, func() {
 				if !tun.isOpen {
 					tun.log.Errorln("TUN iface write error:", err)

src/tun/tun.go

@@ -10,9 +10,10 @@ import (
 	"fmt"
 	"io"
 	"net"
+	"sync"
 
 	"github.com/Arceliar/phony"
-	"golang.zx2c4.com/wireguard/tun"
+	wgtun "golang.zx2c4.com/wireguard/tun"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/address"
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
@@ -39,7 +40,7 @@ type TunAdapter struct {
 	addr        address.Address
 	subnet      address.Subnet
 	mtu         uint64
-	iface       tun.Device
+	iface       wgtun.Device
 	phony.Inbox // Currently only used for _handlePacket from the reader, TODO: all the stuff that currently needs a mutex below
 	isOpen      bool
 	isEnabled   bool // Used by the writer to drop sessionTraffic if not enabled
@@ -48,6 +49,7 @@ type TunAdapter struct {
 		name InterfaceName
 		mtu  InterfaceMTU
 	}
+	ch chan []byte
 }
 
 // Gets the maximum supported MTU for the platform based on the defaults in
@@ -145,6 +147,8 @@ func (tun *TunAdapter) _start() error {
 	tun.rwc.SetMTU(tun.MTU())
 	tun.isOpen = true
 	tun.isEnabled = true
+	tun.ch = make(chan []byte, tun.iface.BatchSize())
+	go tun.queue()
 	go tun.read()
 	go tun.write()
 	return nil
@@ -178,3 +182,12 @@ func (tun *TunAdapter) _stop() error {
 	}
 	return nil
 }
+
+const bufPoolSize = TUN_OFFSET_BYTES + 65535
+
+var bufPool = sync.Pool{
+	New: func() any {
+		b := [bufPoolSize]byte{}
+		return b[:]
+	},
+}

src/tun/tun_freebsd.go

@@ -1,5 +1,5 @@
-//go:build openbsd || freebsd
-// +build openbsd freebsd
+//go:build freebsd
+// +build freebsd
 
 package tun
 
@@ -54,11 +54,6 @@ struct  in6_ifreq {
  290 };
 */
 
-type in6_ifreq_mtu struct {
-	ifr_name [syscall.IFNAMSIZ]byte
-	ifru_mtu int
-}
-
 type in6_ifreq_addr struct {
 	ifr_name  [syscall.IFNAMSIZ]byte
 	ifru_addr sockaddr_in6
@@ -112,26 +107,6 @@ func (tun *TunAdapter) setupAddress(addr string) error {
 	tun.log.Infof("Interface IPv6: %s", addr)
 	tun.log.Infof("Interface MTU: %d", tun.mtu)
 
-	// Create the MTU request
-	var ir in6_ifreq_mtu
-	copy(ir.ifr_name[:], tun.Name())
-	ir.ifru_mtu = int(tun.mtu)
-
-	// Set the MTU
-	if _, _, errno := unix.Syscall(unix.SYS_IOCTL, uintptr(sfd), uintptr(syscall.SIOCSIFMTU), uintptr(unsafe.Pointer(&ir))); errno != 0 {
-		err = errno
-		tun.log.Errorf("Error in SIOCSIFMTU: %v", errno)
-
-		// Fall back to ifconfig to set the MTU
-		cmd := exec.Command("ifconfig", tun.Name(), "mtu", string(tun.mtu))
-		tun.log.Warnf("Using ifconfig as fallback: %v", strings.Join(cmd.Args, " "))
-		output, err := cmd.CombinedOutput()
-		if err != nil {
-			tun.log.Errorf("SIOCSIFMTU fallback failed: %v.", err)
-			tun.log.Traceln(string(output))
-		}
-	}
-
 	// Create the address request
 	// FIXME: I don't work!
 	var ar in6_ifreq_addr

src/tun/tun_openbsd.go

@@ -0,0 +1,122 @@
+//go:build openbsd
+// +build openbsd
+
+package tun
+
+import (
+	"fmt"
+	"net"
+	"syscall"
+	"unsafe"
+
+	"golang.org/x/sys/unix"
+
+	wgtun "golang.zx2c4.com/wireguard/tun"
+)
+
+const (
+	SIOCAIFADDR_IN6       = 0x8080691a
+	ND6_INFINITE_LIFETIME = 0xffffffff
+)
+
+type in6_addrlifetime struct {
+	ia6t_expire    int64
+	ia6t_preferred int64
+	ia6t_vltime    uint32
+	ia6t_pltime    uint32
+}
+
+// Match types from the net package, effectively being [16]byte for IPv6 addresses.
+type in6_addr [16]uint8
+
+type sockaddr_in6 struct {
+	sin6_len      uint8
+	sin6_family   uint8
+	sin6_port     uint16
+	sin6_flowinfo uint32
+	sin6_addr     in6_addr
+	sin6_scope_id uint32
+}
+
+func (sa6 *sockaddr_in6) setSockaddr(addr [/*16*/]byte /* net.IP or net.IPMask */) {
+	sa6.sin6_len    = uint8(unsafe.Sizeof(*sa6))
+	sa6.sin6_family = unix.AF_INET6
+
+	for i := range sa6.sin6_addr {
+		sa6.sin6_addr[i] = addr[i]
+	}
+}
+
+type in6_aliasreq struct {
+	ifra_name       [syscall.IFNAMSIZ]byte
+	ifra_addr       sockaddr_in6
+	ifra_dstaddr    sockaddr_in6
+	ifra_prefixmask sockaddr_in6
+	ifra_flags      int32
+	ifra_lifetime   in6_addrlifetime
+}
+
+// Configures the TUN adapter with the correct IPv6 address and MTU.
+func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
+	iface, err := wgtun.CreateTUN(ifname, int(mtu))
+	if err != nil {
+		return fmt.Errorf("failed to create TUN: %w", err)
+	}
+	tun.iface = iface
+	if mtu, err := iface.MTU(); err == nil {
+		tun.mtu = getSupportedMTU(uint64(mtu))
+	} else {
+		tun.mtu = 0
+	}
+	if addr != "" {
+		return tun.setupAddress(addr)
+	}
+	return nil
+}
+
+// Configures the "utun" adapter from an existing file descriptor.
+func (tun *TunAdapter) setupFD(fd int32, addr string, mtu uint64) error {
+	return fmt.Errorf("setup via FD not supported on this platform")
+}
+
+func (tun *TunAdapter) setupAddress(addr string) error {
+	var sfd int
+	var err error
+
+	ip, prefix, err := net.ParseCIDR(addr)
+	if err != nil {
+		tun.log.Errorf("Error in ParseCIDR: %v", err)
+		return err
+	}
+
+	// Create system socket
+	if sfd, err = unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, 0); err != nil {
+		tun.log.Printf("Create AF_INET6 socket failed: %v", err)
+		return err
+	}
+
+	// Friendly output
+	tun.log.Infof("Interface name: %s", tun.Name())
+	tun.log.Infof("Interface IPv6: %s", addr)
+	tun.log.Infof("Interface MTU: %d", tun.mtu)
+
+	// Create the address request
+	var ar in6_aliasreq
+	copy(ar.ifra_name[:], tun.Name())
+
+	ar.ifra_addr.setSockaddr(ip)
+
+	prefixmask := net.CIDRMask(prefix.Mask.Size())
+	ar.ifra_prefixmask.setSockaddr(prefixmask)
+
+	ar.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME
+	ar.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME
+
+	// Set the interface address
+	if err = unix.IoctlSetInt(sfd, SIOCAIFADDR_IN6, int(uintptr(unsafe.Pointer(&ar)))); err != nil {
+		tun.log.Errorf("Error in SIOCAIFADDR_IN6: %v", err)
+		return err
+	}
+
+	return nil
+}

src/tun/tun_windows.go

@@ -8,10 +8,12 @@ import (
 	"fmt"
 	"log"
 	"net/netip"
+	"time"
 
 	"github.com/yggdrasil-network/yggdrasil-go/src/config"
 	"golang.org/x/sys/windows"
 
+	"golang.zx2c4.com/wintun"
 	wgtun "golang.zx2c4.com/wireguard/tun"
 	"golang.zx2c4.com/wireguard/windows/elevate"
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
@@ -31,11 +33,23 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
 		if guid, err = windows.GUIDFromString("{8f59971a-7872-4aa6-b2eb-061fc4e9d0a7}"); err != nil {
 			return err
 		}
-		if iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu)); err != nil {
-			return err
+		iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu))
+		if err != nil {
+			// Very rare condition, it will purge the old device and create new
+			tun.log.Printf("Error creating TUN: '%s'", err)
+			wintun.Uninstall()
+			time.Sleep(3 * time.Second)
+			tun.log.Printf("Trying again")
+			iface, err = wgtun.CreateTUNWithRequestedGUID(ifname, &guid, int(mtu))
+			if err != nil {
+				return err
+			}
 		}
+		tun.log.Printf("Waiting for TUN to come up")
+		time.Sleep(1 * time.Second)
 		tun.iface = iface
 		if addr != "" {
+			tun.log.Printf("Setting up address")
 			if err = tun.setupAddress(addr); err != nil {
 				tun.log.Errorln("Failed to set up TUN address:", err)
 				return err
@@ -48,6 +62,7 @@ func (tun *TunAdapter) setup(ifname string, addr string, mtu uint64) error {
 		if mtu, err := iface.MTU(); err == nil {
 			tun.mtu = uint64(mtu)
 		}
+		tun.log.Printf("TUN is set up successfully")
 		return nil
 	})
 }