WIP

Refactoring and code cleanup. Improved client command interface.

README.md

@@ -1,41 +1,10 @@
-# vppn: Virtual Pretty Private Network
+# vppn: Virtual Potentially Private Network
 
-## Roadmap
+## TO DO
 
-* Use probe and relayed-probe packets vs ping/pong.
+* peer - write status to file instead of using sockets
-* Rename Mediator -> Relay
+* peer - improve relay selection
-* Use default port 456
+* Double buffering in IFReader and ConnReader ?
-* Remove signing key from hub
-* Peer: UDP hole-punching
-* Peer: local peer discovery - part of RoutingProcessor
-* Peer: update hub w/ latest port on startup
-
-## Learnings
-
-* Encryption / decryption is 20x faster than signing/opening.
-* Allowing out-of order packets is massively important for throughput with TCP
-
-## Principles
-
-* Creates an IPv4/24 network with a maximum of 254 peers. (1-254)
-* Simple setup: via setup link from the hub.
-* Each peer has full network state replicated from the hub.
-
-## Routing
-
-* Routing is different for public vs non-public peers
-  * Public: routes are initialized via incoming ping requests
-  * NonPub: routes are initialized via incoming ping responses
-
-A non-public peer needs to maintain connections with every public peer.
-
-* Sending:
-  * Public: send to address
-  * Non-public: send to a mediator
-
-* Pings:
-  * Servers don't need to ping
-  * Clients need to ping all public and local peers to keep connections open
 
 ## Hub Server Configuration
 
@@ -46,7 +15,6 @@ adduser user
 # Enable ssh.
 cp -r ~/.ssh /home/user/
 chown -R user:user /home/user/.ssh
-
 ```
 
 Upload `hub` executable:
@@ -58,18 +26,14 @@ scp hub user@<remote>:~/
 Create systemd file in `/etc/systemd/system/hub.service
 
 ```
-Description=hub
-Requires=network.target
-
 [Service]
 AmbientCapabilities=CAP_NET_BIND_SERVICE
 Type=simple
 User=user
 WorkingDirectory=/home/user/
-ExecStart=/home/user/hub -listen <addr>:https -secure=true -root-dir=/home/user
+ExecStart=/home/user/hub -listen <addr>:https -root-dir=/home/user
 Restart=always
 RestartSec=8
-TimeoutStopSec=24
 
 [Install]
 WantedBy=default.target
@@ -79,6 +43,7 @@ Add and start the hub server:
 
 ```
 systemctl daemon-reload
+systemctl enable hub
 systemctl start hub
 ```
 
@@ -96,21 +61,25 @@ Install the binary somewhere, for example `~/bin/vppn`.
 
 Create systemd file in `/etc/systemd/system/vppn.service`.
 
-
 ```
-Description=vppn
-Requires=network.target
-
 [Service]
 AmbientCapabilities=CAP_NET_BIND_SERVICE CAP_NET_ADMIN
 Type=simple
 User=user
 WorkingDirectory=/home/user/
-ExecStart=/home/user/vppn -name vppn
+ExecStart=/home/user/vppn run my_net_name https://my.hub my_api_key
 Restart=always
 RestartSec=8
 TimeoutStopSec=24
 
 [Install]
-WantedBy=default.target
+WantedBy=multi-user.target
+```
+
+Add and start the service:
+
+```
+systemctl daemon-reload
+systemctl enable vppn
+systemctl start vppn
 ```

aestests/aes_test.go

@@ -1,79 +0,0 @@
-package aestests
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-	"log"
-	"testing"
-)
-
-func must(err error) {
-	if err != nil {
-		panic(err)
-	}
-}
-
-func TestAES(t *testing.T) {
-	key := make([]byte, 32)
-	rand.Read(key)
-
-	block, err := aes.NewCipher(key)
-	must(err)
-
-	aesgcm, err := cipher.NewGCM(block)
-	must(err)
-
-	log.Print(aesgcm.NonceSize())
-	log.Print(aesgcm.Overhead())
-}
-
-func BenchmarkSeal(b *testing.B) {
-	key := make([]byte, 32)
-	rand.Read(key)
-
-	block, err := aes.NewCipher(key)
-	must(err)
-
-	cryptor, err := cipher.NewGCM(block)
-	must(err)
-
-	nonce := make([]byte, 12)
-	rand.Read(nonce)
-
-	data := make([]byte, 1400)
-	rand.Read(data)
-
-	out := make([]byte, 1500)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		out = cryptor.Seal(out[:0], nonce, data, nil)
-	}
-}
-
-func BenchmarkOpen(b *testing.B) {
-	key := make([]byte, 32)
-	rand.Read(key)
-
-	block, err := aes.NewCipher(key)
-	must(err)
-
-	cryptor, err := cipher.NewGCM(block)
-	must(err)
-
-	nonce := make([]byte, 12)
-	rand.Read(nonce)
-
-	data := make([]byte, 1400)
-	rand.Read(data)
-
-	sealed := make([]byte, 1500)
-	sealed = cryptor.Seal(sealed[:0], nonce, data, nil)
-
-	dec := make([]byte, 1500)
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		dec, err = cryptor.Open(dec[:0], nonce, sealed, nil)
-	}
-}

cmd/vppn/build.sh

@@ -1,5 +0,0 @@
-#!/bin/bash
-
-go build
-sudo setcap cap_net_admin+iep vppn
-sudo setcap cap_net_bind_service+iep vppn

cmd/vppn/main.go

@@ -2,10 +2,10 @@ package main
 
 import (
 	"log"
-	"vppn/node"
+	"vppn/peer"
 )
 
 func main() {
 	log.SetFlags(0)
-	node.Main()
+	peer.Main2()
 }

go.mod

@@ -1,17 +1,25 @@
 module vppn
 
-go 1.23.2
+go 1.25.1
 
 require (
-	git.crumpington.com/lib/go v0.8.1
+	git.crumpington.com/lib/go v0.9.1
-	git.crumpington.com/lib/webutil v0.0.7
+	golang.org/x/crypto v0.42.0
-	github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8
+	golang.org/x/sys v0.36.0
-	golang.org/x/crypto v0.29.0
 )
 
 require (
-	github.com/mattn/go-sqlite3 v1.14.24 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
-	golang.org/x/net v0.31.0 // indirect
+	github.com/josharian/native v1.1.0 // indirect
-	golang.org/x/sys v0.27.0 // indirect
+	github.com/mattn/go-sqlite3 v1.14.32 // indirect
-	golang.org/x/text v0.20.0 // indirect
+	github.com/mdlayher/genetlink v1.3.2 // indirect
+	github.com/mdlayher/netlink v1.7.2 // indirect
+	github.com/mdlayher/socket v0.5.1 // indirect
+	github.com/vishvananda/netlink v1.3.1 // indirect
+	github.com/vishvananda/netns v0.0.5 // indirect
+	golang.org/x/net v0.44.0 // indirect
+	golang.org/x/sync v0.17.0 // indirect
+	golang.org/x/text v0.29.0 // indirect
+	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173 // indirect
+	golang.zx2c4.com/wireguard/wgctrl v0.0.0-20241231184526-a9ab2273dd10 // indirect
 )

go.sum

@@ -1,16 +1,34 @@
-git.crumpington.com/lib/go v0.8.1 h1:rWjddllSxQ4yReraqDaGZAod4NpRD9LtGx1yV71ytcU=
+git.crumpington.com/lib/go v0.9.1 h1:xLBzcgiZRB6Ky3Ce9hKE+Ko0YbkA4USF4eJk5i5RJF4=
-git.crumpington.com/lib/go v0.8.1/go.mod h1:XjQaf2NFlje9BJ1EevZL8NNioPrAe7WwHpKUhcDw2Lk=
+git.crumpington.com/lib/go v0.9.1/go.mod h1:5nnfjdnUnj/FHhakaliKQKsKeSkUb0GEUKF3PqRgUXg=
-git.crumpington.com/lib/webutil v0.0.7 h1:1RG9CpuXYalT0NPj8fvxjOLV566LqL37APvAdASFzgA=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
-git.crumpington.com/lib/webutil v0.0.7/go.mod h1:efIEiuK1uqFIhI/dlsWUHMsC5bXcEbJEjmdluRoFPPQ=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
-github.com/mattn/go-sqlite3 v1.14.24 h1:tpSp2G2KyMnnQu99ngJ47EIkWVmliIizyZBfPrBWDRM=
+github.com/josharian/native v1.1.0 h1:uuaP0hAbW7Y4l0ZRQ6C9zfb7Mg1mbFKry/xzDAfmtLA=
-github.com/mattn/go-sqlite3 v1.14.24/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
+github.com/josharian/native v1.1.0/go.mod h1:7X/raswPFr05uY3HiLlYeyQntB6OO7E/d2Cu7qoaN2w=
-github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8 h1:TG/diQgUe0pntT/2D9tmUCz4VNwm9MfrtPr0SU2qSX8=
+github.com/mattn/go-sqlite3 v1.14.32 h1:JD12Ag3oLy1zQA+BNn74xRgaBbdhbNIDYvQUEuuErjs=
-github.com/songgao/water v0.0.0-20200317203138-2b4b6d7c09d8/go.mod h1:P5HUIBuIWKbyjl083/loAegFkfbFNx5i2qEP4CNbm7E=
+github.com/mattn/go-sqlite3 v1.14.32/go.mod h1:Uh1q+B4BYcTPb+yiD3kU8Ct7aC0hY9fxUwlHK0RXw+Y=
-golang.org/x/crypto v0.29.0 h1:L5SG1JTTXupVV3n6sUqMTeWbjAyfPwoda2DLX8J8FrQ=
+github.com/mdlayher/genetlink v1.3.2 h1:KdrNKe+CTu+IbZnm/GVUMXSqBBLqcGpRDa0xkQy56gw=
-golang.org/x/crypto v0.29.0/go.mod h1:+F4F4N5hv6v38hfeYwTdx20oUvLLc+QfrE9Ax9HtgRg=
+github.com/mdlayher/genetlink v1.3.2/go.mod h1:tcC3pkCrPUGIKKsCsp0B3AdaaKuHtaxoJRz3cc+528o=
-golang.org/x/net v0.31.0 h1:68CPQngjLL0r2AlUKiSxtQFKvzRVbnzLwMUn5SzcLHo=
+github.com/mdlayher/netlink v1.7.2 h1:/UtM3ofJap7Vl4QWCPDGXY8d3GIY2UGSDbK+QWmY8/g=
-golang.org/x/net v0.31.0/go.mod h1:P4fl1q7dY2hnZFxEk4pPSkDHF+QqjitcnDjUQyMM+pM=
+github.com/mdlayher/netlink v1.7.2/go.mod h1:xraEF7uJbxLhc5fpHL4cPe221LI2bdttWlU+ZGLfQSw=
-golang.org/x/sys v0.27.0 h1:wBqf8DvsY9Y/2P8gAfPDEYNuS30J4lPHJxXSb/nJZ+s=
+github.com/mdlayher/socket v0.5.1 h1:VZaqt6RkGkt2OE9l3GcC6nZkqD3xKeQLyfleW/uBcos=
-golang.org/x/sys v0.27.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+github.com/mdlayher/socket v0.5.1/go.mod h1:TjPLHI1UgwEv5J1B5q0zTZq12A/6H7nKmtTanQE37IQ=
-golang.org/x/text v0.20.0 h1:gK/Kv2otX8gz+wn7Rmb3vT96ZwuoxnQlY+HlJVj7Qug=
+github.com/vishvananda/netlink v1.3.1 h1:3AEMt62VKqz90r0tmNhog0r/PpWKmrEShJU0wJW6bV0=
-golang.org/x/text v0.20.0/go.mod h1:D4IsuqiFMhST5bX19pQ9ikHC2GsaKyk/oF+pn3ducp4=
+github.com/vishvananda/netlink v1.3.1/go.mod h1:ARtKouGSTGchR8aMwmkzC0qiNPrrWO5JS/XMVl45+b4=
+github.com/vishvananda/netns v0.0.5 h1:DfiHV+j8bA32MFM7bfEunvT8IAqQ/NzSJHtcmW5zdEY=
+github.com/vishvananda/netns v0.0.5/go.mod h1:SpkAiCQRtJ6TvvxPnOSyH3BMl6unz3xZlaprSwhNNJM=
+golang.org/x/crypto v0.42.0 h1:chiH31gIWm57EkTXpwnqf8qeuMUi0yekh6mT2AvFlqI=
+golang.org/x/crypto v0.42.0/go.mod h1:4+rDnOTJhQCx2q7/j6rAN5XDw8kPjeaXEUR2eL94ix8=
+golang.org/x/net v0.44.0 h1:evd8IRDyfNBMBTTY5XRF1vaZlD+EmWx6x8PkhR04H/I=
+golang.org/x/net v0.44.0/go.mod h1:ECOoLqd5U3Lhyeyo/QDCEVQ4sNgYsqvCZ722XogGieY=
+golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
+golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
+golang.org/x/sys v0.2.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=
+golang.org/x/sys v0.36.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
+golang.org/x/text v0.29.0 h1:1neNs90w9YzJ9BocxfsQNHKuAT4pkghyXc4nhZ6sJvk=
+golang.org/x/text v0.29.0/go.mod h1:7MhJOA9CD2qZyOKYazxdYMF85OwPdEr9jTtBpO7ydH4=
+golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173 h1:/jFs0duh4rdb8uIfPMv78iAJGcPKDeqAFnaLBropIC4=
+golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173/go.mod h1:tkCQ4FQXmpAgYVh++1cq16/dH4QJtmvpRv19DWGAHSA=
+golang.zx2c4.com/wireguard/wgctrl v0.0.0-20241231184526-a9ab2273dd10 h1:3GDAcqdIg1ozBNLgPy4SLT84nfcBjr6rhGtXYtrkWLU=
+golang.zx2c4.com/wireguard/wgctrl v0.0.0-20241231184526-a9ab2273dd10/go.mod h1:T97yPqesLiNrOYxkwmhMI0ZIlJDm+p0PMR8eRVeR5tQ=

hub/api/api.go

@@ -1,7 +1,6 @@
 package api
 
 import (
-	"crypto/rand"
 	"database/sql"
 	"embed"
 	"errors"
@@ -14,7 +13,6 @@ import (
 	"git.crumpington.com/lib/go/idgen"
 	"git.crumpington.com/lib/go/sqliteutil"
 	"golang.org/x/crypto/bcrypt"
-	"golang.org/x/crypto/nacl/box"
 )
 
 //go:embed migrations
@@ -23,7 +21,8 @@ var migrations embed.FS
 type API struct {
 	db         *sql.DB
 	lock       sync.Mutex
-	peerIntents map[string]PeerCreateArgs
+	sessionsMu sync.Mutex
+	sessions   map[string]*Session
 }
 
 func New(dbPath string) (*API, error) {
@@ -38,7 +37,7 @@ func New(dbPath string) (*API, error) {
 
 	a := &API{
 		db:       sqlDB,
-		peerIntents: map[string]PeerCreateArgs{},
+		sessions: make(map[string]*Session),
 	}
 
 	return a, a.ensurePassword()
@@ -58,17 +57,11 @@ func (a *API) ensurePassword() error {
 	log.Printf("Setting password: %s", pwd)
 
 	hashed, err := bcrypt.GenerateFromPassword([]byte(pwd), bcrypt.DefaultCost)
-
 	if err != nil {
 		return err
 	}
 
-	conf := &Config{
+	conf := &Config{ConfigID: 1, Password: hashed}
-		ConfigID:   1,
-		VPNNetwork: []byte{10, 1, 1, 0},
-		Password:   hashed,
-	}
-
 	return db.Config_Insert(a.db, conf)
 }
 
@@ -84,52 +77,42 @@ func (a *API) Config_Update(conf *Config) error {
 	return db.Config_Update(a.db, conf)
 }
 
-func (a *API) Config_UpdatePassword(pwdHash []byte) error {
-	return db.Config_UpdatePassword(a.db, pwdHash)
-}
-
 func (a *API) Session_Delete(sessionID string) error {
-	return db.Session_Delete(a.db, sessionID)
+	a.sessionsMu.Lock()
+	defer a.sessionsMu.Unlock()
+	delete(a.sessions, sessionID)
+	return nil
 }
 
 func (a *API) Session_Get(sessionID string) (*Session, error) {
-	if sessionID == "" {
+	a.sessionsMu.Lock()
-		return a.session_CreatePub()
+	defer a.sessionsMu.Unlock()
-	}
 
-	session, err := db.Session_Get(a.db, sessionID)
+	if sessionID != "" {
-	if err != nil {
+		s, ok := a.sessions[sessionID]
-		return a.session_CreatePub()
+		if ok {
+			if timeSince(s.LastSeenAt) <= 86400*21 {
+				if timeSince(s.LastSeenAt) > 86400*7 {
+					s.LastSeenAt = time.Now().Unix()
 				}
-
+				return s, nil
-	if timeSince(session.LastSeenAt) > 86400*21 {
-		return a.session_CreatePub()
 			}
-
+			delete(a.sessions, sessionID)
-	if timeSince(session.LastSeenAt) > 86400*7 {
-		session.LastSeenAt = time.Now().Unix()
-		if err := db.Session_UpdateLastSeenAt(a.db, session.SessionID); err != nil {
-			log.Printf("Failed to update session: %v", err)
 		}
 	}
 
-	return session, nil
+	return a.session_Create(), nil
 }
 
-func (a *API) session_CreatePub() (*Session, error) {
+// caller must hold sessionsMu
+func (a *API) session_Create() *Session {
 	s := &Session{
 		SessionID:  idgen.NewToken(),
-		CSRF:       idgen.NewToken(),
-		SignedIn:   false,
 		CreatedAt:  time.Now().Unix(),
 		LastSeenAt: time.Now().Unix(),
 	}
-	err := db.Session_Insert(a.db, s)
+	a.sessions[s.SessionID] = s
-	return s, err
+	return s
-}
-
-func (a *API) Session_DeleteBefore(timestamp int64) error {
-	return db.Session_DeleteBefore(a.db, timestamp)
 }
 
 func (a *API) Session_SignIn(s *Session, pwd string) error {
@@ -137,98 +120,46 @@ func (a *API) Session_SignIn(s *Session, pwd string) error {
 	if err := bcrypt.CompareHashAndPassword(conf.Password, []byte(pwd)); err != nil {
 		return ErrNotAuthorized
 	}
-
+	a.sessionsMu.Lock()
-	return db.Session_SetSignedIn(a.db, s.SessionID)
+	s.SignedIn = true
+	a.sessionsMu.Unlock()
+	return nil
 }
 
-type PeerCreateArgs struct {
+func (a *API) Network_Create(n *Network) error {
-	Name     string
+	n.NetworkID = idgen.NextID(0)
-	PublicIP []byte
+	return db.Network_Insert(a.db, n)
-	Port     uint16
-	Relay    bool
 }
 
-// Create the intention to add a peer. The returned code is used to complete
+func (a *API) Network_Delete(n *Network) error {
-// the peer creation. The code is valid for 5 minutes.
+	return db.Network_Delete(a.db, n.NetworkID)
-func (a *API) Peer_CreateIntent(args PeerCreateArgs) string {
+}
+
+func (a *API) Network_Get(id int64) (*Network, error) {
+	return db.Network_Get(a.db, id)
+}
+
+func (a *API) Network_List() ([]*Network, error) {
+	const query = db.Network_SelectQuery + ` ORDER BY Name ASC`
+	return db.Network_List(a.db, query)
+}
+
+func (a *API) Peer_CreateNew(p *Peer) error {
+	p.Version = idgen.NextID(0)
+	p.WGPubKey = []byte{}
+	p.APIKey = idgen.NewToken()
+
+	return db.Peer_Insert(a.db, p)
+}
+
+func (a *API) Peer_Init(peer *Peer, args m.PeerInitArgs) error {
 	a.lock.Lock()
 	defer a.lock.Unlock()
 
-	code := idgen.NewToken()
+	peer.Version = idgen.NextID(0)
-	a.peerIntents[code] = args
+	peer.WGPubKey = args.WGPubKey
 
-	go func() {
+	return db.Peer_UpdateFull(a.db, peer)
-		time.Sleep(5 * time.Minute)
-		a.lock.Lock()
-		defer a.lock.Unlock()
-		delete(a.peerIntents, code)
-	}()
-
-	return code
-}
-
-func (a *API) Peer_Create(creationCode string) (*m.PeerConfig, error) {
-	a.lock.Lock()
-	defer a.lock.Unlock()
-
-	args, ok := a.peerIntents[creationCode]
-	if !ok {
-		return nil, ErrNotAuthorized
-	}
-
-	delete(a.peerIntents, creationCode)
-
-	encPubKey, encPrivKey, err := box.GenerateKey(rand.Reader)
-	if err != nil {
-		return nil, err
-	}
-
-	// Get peer IP.
-	peerIP := byte(0)
-
-	for i := byte(1); i < 255; i++ {
-		exists, err := db.Peer_Exists(a.db, i)
-		if err != nil {
-			return nil, err
-		}
-		if !exists {
-			peerIP = i
-			break
-		}
-	}
-
-	if peerIP == 0 {
-		return nil, ErrNoIPAvailable
-	}
-
-	peer := &Peer{
-		PeerIP:   peerIP,
-		Version:  idgen.NextID(0),
-		APIKey:   idgen.NewToken(),
-		Name:     args.Name,
-		PublicIP: args.PublicIP,
-		Port:     args.Port,
-		Relay:    args.Relay,
-		PubKey:   encPubKey[:],
-	}
-
-	if err := db.Peer_Insert(a.db, peer); err != nil {
-		return nil, err
-	}
-
-	conf := a.Config_Get()
-
-	return &m.PeerConfig{
-		PeerIP:     peer.PeerIP,
-		HubAddress: conf.HubAddress,
-		APIKey:     peer.APIKey,
-		Network:    conf.VPNNetwork,
-		PublicIP:   peer.PublicIP,
-		Port:       peer.Port,
-		Relay:   peer.Relay,
-		PubKey:     encPubKey[:],
-		PrivKey:    encPrivKey[:],
-	}, nil
 }
 
 func (a *API) Peer_Update(p *Peer) error {
@@ -239,16 +170,16 @@ func (a *API) Peer_Update(p *Peer) error {
 	return db.Peer_Update(a.db, p)
 }
 
-func (a *API) Peer_Delete(ip byte) error {
+func (a *API) Peer_Delete(networkID int64, peerIP byte) error {
-	return db.Peer_Delete(a.db, ip)
+	return db.Peer_Delete(a.db, networkID, peerIP)
 }
 
-func (a *API) Peer_List() ([]*Peer, error) {
+func (a *API) Peer_List(networkID int64) ([]*Peer, error) {
-	return db.Peer_ListAll(a.db)
+	return db.Peer_ListAll(a.db, networkID)
 }
 
-func (a *API) Peer_Get(ip byte) (*Peer, error) {
+func (a *API) Peer_Get(networkID int64, ip byte) (*Peer, error) {
-	return db.Peer_Get(a.db, ip)
+	return db.Peer_Get(a.db, networkID, ip)
 }
 
 func (a *API) Peer_GetByAPIKey(key string) (*Peer, error) {

hub/api/db/generated.go

@@ -17,12 +17,10 @@ type TX interface {
 
 type Config struct {
 	ConfigID int64
-	HubAddress string
-	VPNNetwork []byte
 	Password []byte
 }
 
-const Config_SelectQuery = "SELECT ConfigID,HubAddress,VPNNetwork,Password FROM config"
+const Config_SelectQuery = "SELECT ConfigID,Password FROM config"
 
 func Config_Insert(
 	tx TX,
@@ -33,7 +31,7 @@ func Config_Insert(
 		return err
 	}
 
-	_, err = tx.Exec("INSERT INTO config(ConfigID,HubAddress,VPNNetwork,Password) VALUES(?,?,?,?)", row.ConfigID, row.HubAddress, row.VPNNetwork, row.Password)
+	_, err = tx.Exec("INSERT INTO config(ConfigID,Password) VALUES(?,?)", row.ConfigID, row.Password)
 	return err
 }
 
@@ -46,7 +44,7 @@ func Config_Update(
 		return err
 	}
 
-	result, err := tx.Exec("UPDATE config SET HubAddress=?,VPNNetwork=? WHERE ConfigID=?", row.HubAddress, row.VPNNetwork, row.ConfigID)
+	result, err := tx.Exec("UPDATE config SET Password=? WHERE ConfigID=?", row.Password, row.ConfigID)
 	if err != nil {
 		return err
 	}
@@ -74,7 +72,7 @@ func Config_UpdateFull(
 		return err
 	}
 
-	result, err := tx.Exec("UPDATE config SET HubAddress=?,VPNNetwork=?,Password=? WHERE ConfigID=?", row.HubAddress, row.VPNNetwork, row.Password, row.ConfigID)
+	result, err := tx.Exec("UPDATE config SET Password=? WHERE ConfigID=?", row.Password, row.ConfigID)
 	if err != nil {
 		return err
 	}
@@ -124,8 +122,10 @@ func Config_Get(
 	err error,
 ) {
 	row = &Config{}
-	r := tx.QueryRow("SELECT ConfigID,HubAddress,VPNNetwork,Password FROM config WHERE ConfigID=?", ConfigID)
+	r := tx.QueryRow("SELECT ConfigID,Password FROM config WHERE ConfigID=?", ConfigID)
-	err = r.Scan(&row.ConfigID, &row.HubAddress, &row.VPNNetwork, &row.Password)
+	if err = r.Scan(&row.ConfigID, &row.Password); err != nil {
+		row = nil
+	}
 	return
 }
 
@@ -139,7 +139,9 @@ func Config_GetWhere(
 ) {
 	row = &Config{}
 	r := tx.QueryRow(query, args...)
-	err = r.Scan(&row.ConfigID, &row.HubAddress, &row.VPNNetwork, &row.Password)
+	if err = r.Scan(&row.ConfigID, &row.Password); err != nil {
+		row = nil
+	}
 	return
 }
 
@@ -159,7 +161,7 @@ func Config_Iterate(
 		defer rows.Close()
 		for rows.Next() {
 			row := &Config{}
-			err := rows.Scan(&row.ConfigID, &row.HubAddress, &row.VPNNetwork, &row.Password)
+			err := rows.Scan(&row.ConfigID, &row.Password)
 			if !yield(row, err) {
 				return
 			}
@@ -185,37 +187,63 @@ func Config_List(
 }
 
 // ----------------------------------------------------------------------------
-// Table: sessions
+// Table: networks
 // ----------------------------------------------------------------------------
 
-type Session struct {
+type Network struct {
-	SessionID  string
+	NetworkID int64
-	CSRF       string
+	Name      string
-	SignedIn   bool
+	Network   []byte
-	CreatedAt  int64
-	LastSeenAt int64
 }
 
-const Session_SelectQuery = "SELECT SessionID,CSRF,SignedIn,CreatedAt,LastSeenAt FROM sessions"
+const Network_SelectQuery = "SELECT NetworkID,Name,Network FROM networks"
 
-func Session_Insert(
+func Network_Insert(
 	tx TX,
-	row *Session,
+	row *Network,
 ) (err error) {
-	Session_Sanitize(row)
+	Network_Sanitize(row)
-	if err = Session_Validate(row); err != nil {
+	if err = Network_Validate(row); err != nil {
 		return err
 	}
 
-	_, err = tx.Exec("INSERT INTO sessions(SessionID,CSRF,SignedIn,CreatedAt,LastSeenAt) VALUES(?,?,?,?,?)", row.SessionID, row.CSRF, row.SignedIn, row.CreatedAt, row.LastSeenAt)
+	_, err = tx.Exec("INSERT INTO networks(NetworkID,Name,Network) VALUES(?,?,?)", row.NetworkID, row.Name, row.Network)
 	return err
 }
 
-func Session_Delete(
+func Network_UpdateFull(
 	tx TX,
-	SessionID string,
+	row *Network,
 ) (err error) {
-	result, err := tx.Exec("DELETE FROM sessions WHERE SessionID=?", SessionID)
+	Network_Sanitize(row)
+	if err = Network_Validate(row); err != nil {
+		return err
+	}
+
+	result, err := tx.Exec("UPDATE networks SET Name=?,Network=? WHERE NetworkID=?", row.Name, row.Network, row.NetworkID)
+	if err != nil {
+		return err
+	}
+
+	n, err := result.RowsAffected()
+	if err != nil {
+		panic(err)
+	}
+	switch n {
+	case 0:
+		return sql.ErrNoRows
+	case 1:
+		return nil
+	default:
+		panic("multiple rows updated")
+	}
+}
+
+func Network_Delete(
+	tx TX,
+	NetworkID int64,
+) (err error) {
+	result, err := tx.Exec("DELETE FROM networks WHERE NetworkID=?", NetworkID)
 	if err != nil {
 		return err
 	}
@@ -234,50 +262,54 @@ func Session_Delete(
 	}
 }
 
-func Session_Get(
+func Network_Get(
 	tx TX,
-	SessionID string,
+	NetworkID int64,
 ) (
-	row *Session,
+	row *Network,
 	err error,
 ) {
-	row = &Session{}
+	row = &Network{}
-	r := tx.QueryRow("SELECT SessionID,CSRF,SignedIn,CreatedAt,LastSeenAt FROM sessions WHERE SessionID=?", SessionID)
+	r := tx.QueryRow("SELECT NetworkID,Name,Network FROM networks WHERE NetworkID=?", NetworkID)
-	err = r.Scan(&row.SessionID, &row.CSRF, &row.SignedIn, &row.CreatedAt, &row.LastSeenAt)
+	if err = r.Scan(&row.NetworkID, &row.Name, &row.Network); err != nil {
+		row = nil
+	}
 	return
 }
 
-func Session_GetWhere(
+func Network_GetWhere(
 	tx TX,
 	query string,
 	args ...any,
 ) (
-	row *Session,
+	row *Network,
 	err error,
 ) {
-	row = &Session{}
+	row = &Network{}
 	r := tx.QueryRow(query, args...)
-	err = r.Scan(&row.SessionID, &row.CSRF, &row.SignedIn, &row.CreatedAt, &row.LastSeenAt)
+	if err = r.Scan(&row.NetworkID, &row.Name, &row.Network); err != nil {
+		row = nil
+	}
 	return
 }
 
-func Session_Iterate(
+func Network_Iterate(
 	tx TX,
 	query string,
 	args ...any,
-) iter.Seq2[*Session, error] {
+) iter.Seq2[*Network, error] {
 	rows, err := tx.Query(query, args...)
 	if err != nil {
-		return func(yield func(*Session, error) bool) {
+		return func(yield func(*Network, error) bool) {
 			yield(nil, err)
 		}
 	}
 
-	return func(yield func(*Session, error) bool) {
+	return func(yield func(*Network, error) bool) {
 		defer rows.Close()
 		for rows.Next() {
-			row := &Session{}
+			row := &Network{}
-			err := rows.Scan(&row.SessionID, &row.CSRF, &row.SignedIn, &row.CreatedAt, &row.LastSeenAt)
+			err := rows.Scan(&row.NetworkID, &row.Name, &row.Network)
 			if !yield(row, err) {
 				return
 			}
@@ -285,15 +317,15 @@ func Session_Iterate(
 	}
 }
 
-func Session_List(
+func Network_List(
 	tx TX,
 	query string,
 	args ...any,
 ) (
-	l []*Session,
+	l []*Network,
 	err error,
 ) {
-	for row, err := range Session_Iterate(tx, query, args...) {
+	for row, err := range Network_Iterate(tx, query, args...) {
 		if err != nil {
 			return nil, err
 		}
@@ -307,17 +339,20 @@ func Session_List(
 // ----------------------------------------------------------------------------
 
 type Peer struct {
+	NetworkID int64
 	PeerIP    byte
 	Version   int64
 	APIKey    string
 	Name      string
-	PublicIP []byte
+	PublicIP1 []byte
-	Port     uint16
+	Port1     uint16
+	PublicIP2 []byte
+	Port2     uint16
 	Relay     bool
-	PubKey   []byte
+	WGPubKey  []byte
 }
 
-const Peer_SelectQuery = "SELECT PeerIP,Version,APIKey,Name,PublicIP,Port,Relay,PubKey FROM peers"
+const Peer_SelectQuery = "SELECT NetworkID,PeerIP,Version,APIKey,Name,PublicIP1,Port1,PublicIP2,Port2,Relay,WGPubKey FROM peers"
 
 func Peer_Insert(
 	tx TX,
@@ -328,7 +363,7 @@ func Peer_Insert(
 		return err
 	}
 
-	_, err = tx.Exec("INSERT INTO peers(PeerIP,Version,APIKey,Name,PublicIP,Port,Relay,PubKey) VALUES(?,?,?,?,?,?,?,?)", row.PeerIP, row.Version, row.APIKey, row.Name, row.PublicIP, row.Port, row.Relay, row.PubKey)
+	_, err = tx.Exec("INSERT INTO peers(NetworkID,PeerIP,Version,APIKey,Name,PublicIP1,Port1,PublicIP2,Port2,Relay,WGPubKey) VALUES(?,?,?,?,?,?,?,?,?,?,?)", row.NetworkID, row.PeerIP, row.Version, row.APIKey, row.Name, row.PublicIP1, row.Port1, row.PublicIP2, row.Port2, row.Relay, row.WGPubKey)
 	return err
 }
 
@@ -341,7 +376,7 @@ func Peer_Update(
 		return err
 	}
 
-	result, err := tx.Exec("UPDATE peers SET Version=?,Name=?,PublicIP=?,Port=?,Relay=? WHERE PeerIP=?", row.Version, row.Name, row.PublicIP, row.Port, row.Relay, row.PeerIP)
+	result, err := tx.Exec("UPDATE peers SET Version=?,Name=?,PublicIP1=?,Port1=?,PublicIP2=?,Port2=?,Relay=? WHERE NetworkID=? AND PeerIP=?", row.Version, row.Name, row.PublicIP1, row.Port1, row.PublicIP2, row.Port2, row.Relay, row.NetworkID, row.PeerIP)
 	if err != nil {
 		return err
 	}
@@ -369,7 +404,7 @@ func Peer_UpdateFull(
 		return err
 	}
 
-	result, err := tx.Exec("UPDATE peers SET Version=?,APIKey=?,Name=?,PublicIP=?,Port=?,Relay=?,PubKey=? WHERE PeerIP=?", row.Version, row.APIKey, row.Name, row.PublicIP, row.Port, row.Relay, row.PubKey, row.PeerIP)
+	result, err := tx.Exec("UPDATE peers SET Version=?,APIKey=?,Name=?,PublicIP1=?,Port1=?,PublicIP2=?,Port2=?,Relay=?,WGPubKey=? WHERE NetworkID=? AND PeerIP=?", row.Version, row.APIKey, row.Name, row.PublicIP1, row.Port1, row.PublicIP2, row.Port2, row.Relay, row.WGPubKey, row.NetworkID, row.PeerIP)
 	if err != nil {
 		return err
 	}
@@ -390,9 +425,10 @@ func Peer_UpdateFull(
 
 func Peer_Delete(
 	tx TX,
+	NetworkID int64,
 	PeerIP byte,
 ) (err error) {
-	result, err := tx.Exec("DELETE FROM peers WHERE PeerIP=?", PeerIP)
+	result, err := tx.Exec("DELETE FROM peers WHERE NetworkID=? AND PeerIP=?", NetworkID, PeerIP)
 	if err != nil {
 		return err
 	}
@@ -413,14 +449,17 @@ func Peer_Delete(
 
 func Peer_Get(
 	tx TX,
+	NetworkID int64,
 	PeerIP byte,
 ) (
 	row *Peer,
 	err error,
 ) {
 	row = &Peer{}
-	r := tx.QueryRow("SELECT PeerIP,Version,APIKey,Name,PublicIP,Port,Relay,PubKey FROM peers WHERE PeerIP=?", PeerIP)
+	r := tx.QueryRow("SELECT NetworkID,PeerIP,Version,APIKey,Name,PublicIP1,Port1,PublicIP2,Port2,Relay,WGPubKey FROM peers WHERE NetworkID=? AND PeerIP=?", NetworkID, PeerIP)
-	err = r.Scan(&row.PeerIP, &row.Version, &row.APIKey, &row.Name, &row.PublicIP, &row.Port, &row.Relay, &row.PubKey)
+	if err = r.Scan(&row.NetworkID, &row.PeerIP, &row.Version, &row.APIKey, &row.Name, &row.PublicIP1, &row.Port1, &row.PublicIP2, &row.Port2, &row.Relay, &row.WGPubKey); err != nil {
+		row = nil
+	}
 	return
 }
 
@@ -434,7 +473,9 @@ func Peer_GetWhere(
 ) {
 	row = &Peer{}
 	r := tx.QueryRow(query, args...)
-	err = r.Scan(&row.PeerIP, &row.Version, &row.APIKey, &row.Name, &row.PublicIP, &row.Port, &row.Relay, &row.PubKey)
+	if err = r.Scan(&row.NetworkID, &row.PeerIP, &row.Version, &row.APIKey, &row.Name, &row.PublicIP1, &row.Port1, &row.PublicIP2, &row.Port2, &row.Relay, &row.WGPubKey); err != nil {
+		row = nil
+	}
 	return
 }
 
@@ -454,7 +495,7 @@ func Peer_Iterate(
 		defer rows.Close()
 		for rows.Next() {
 			row := &Peer{}
-			err := rows.Scan(&row.PeerIP, &row.Version, &row.APIKey, &row.Name, &row.PublicIP, &row.Port, &row.Relay, &row.PubKey)
+			err := rows.Scan(&row.NetworkID, &row.PeerIP, &row.Version, &row.APIKey, &row.Name, &row.PublicIP1, &row.Port1, &row.PublicIP2, &row.Port2, &row.Relay, &row.WGPubKey)
 			if !yield(row, err) {
 				return
 			}

hub/api/db/sanitize-validate.go

@@ -3,67 +3,110 @@ package db
 import (
 	"errors"
 	"net/netip"
-	"net/url"
 	"strings"
 )
 
 var (
 	ErrInvalidIP       = errors.New("invalid IP")
+	ErrNonPrivateIP    = errors.New("non-private IP")
 	ErrInvalidPort     = errors.New("invalid port")
+	ErrInvalidNetName  = errors.New("invalid network name")
+	ErrInvalidPeerName = errors.New("invalid peer name")
 )
 
 func Config_Sanitize(c *Config) {
-	if u, err := url.Parse(c.HubAddress); err == nil {
-		c.HubAddress = u.String()
-	}
-
-	if addr, ok := netip.AddrFromSlice(c.VPNNetwork); ok {
-		c.VPNNetwork = addr.AsSlice()
-	}
 }
 
 func Config_Validate(c *Config) error {
-	if _, err := url.Parse(c.HubAddress); err != nil {
+	return nil
-		return err
+}
+
+func Network_Sanitize(n *Network) {
+	n.Name = strings.TrimSpace(n.Name)
+
+	if addr, ok := netip.AddrFromSlice(n.Network); ok {
+		n.Network = addr.AsSlice()
+	}
+}
+
+func Network_Validate(c *Network) error {
+	// 16 bytes is linux limit for network interface names.
+	if len(c.Name) == 0 || len(c.Name) > 16 {
+		return ErrInvalidNetName
 	}
 
-	addr, ok := netip.AddrFromSlice(c.VPNNetwork)
+	for _, c := range c.Name {
+		if c >= 'a' && c <= 'z' {
+			continue
+		}
+		if c >= '0' && c <= '9' {
+			continue
+		}
+		return ErrInvalidNetName
+	}
+
+	addr, ok := netip.AddrFromSlice(c.Network)
 	if !ok || !addr.Is4() || addr.As4()[3] != 0 || addr.As4()[0] == 0 {
 		return ErrInvalidIP
 	}
 
-	return nil
+	if !addr.IsPrivate() {
-}
+		return ErrNonPrivateIP
+	}
 
-func Session_Sanitize(s *Session) {
-}
-
-func Session_Validate(s *Session) error {
 	return nil
 }
 
 func Peer_Sanitize(p *Peer) {
 	p.Name = strings.TrimSpace(p.Name)
-	if len(p.PublicIP) != 0 {
+	if len(p.PublicIP1) != 0 {
-		addr, ok := netip.AddrFromSlice(p.PublicIP)
+		if addr, ok := netip.AddrFromSlice(p.PublicIP1); ok {
-		if ok && addr.Is4() {
+			p.PublicIP1 = addr.AsSlice()
-			p.PublicIP = addr.AsSlice()
 		}
 	}
-	if p.Port == 0 {
+	if len(p.PublicIP2) != 0 {
-		p.Port = 456
+		if addr, ok := netip.AddrFromSlice(p.PublicIP2); ok {
+			p.PublicIP2 = addr.AsSlice()
+		}
+	}
+	if p.Port1 == 0 {
+		p.Port1 = 456
+	}
+	if len(p.PublicIP2) != 0 && p.Port2 == 0 {
+		p.Port2 = 456
 	}
 }
 
 func Peer_Validate(p *Peer) error {
-	if len(p.PublicIP) > 0 {
+	if len(p.PublicIP1) > 0 {
-		_, ok := netip.AddrFromSlice(p.PublicIP)
+		if _, ok := netip.AddrFromSlice(p.PublicIP1); !ok {
-		if !ok {
 			return ErrInvalidIP
 		}
 	}
-	if p.Port == 0 {
+	if len(p.PublicIP2) > 0 {
+		if _, ok := netip.AddrFromSlice(p.PublicIP2); !ok {
+			return ErrInvalidIP
+		}
+		if p.Port2 == 0 {
 			return ErrInvalidPort
 		}
+	}
+	if p.Port1 == 0 {
+		return ErrInvalidPort
+	}
+
+	for _, c := range p.Name {
+		if c >= 'a' && c <= 'z' {
+			continue
+		}
+		if c >= '0' && c <= '9' {
+			continue
+		}
+		if c == '.' || c == '-' || c == '_' {
+			continue
+		}
+		return ErrInvalidPeerName
+	}
+
 	return nil
 }

hub/api/db/tables.defs

@@ -1,25 +1,24 @@
 TABLE config OF Config (
   ConfigID    int64  PK,
-  HubAddress  string,
+  Password    []byte
-  VPNNetwork  []byte,
-  Password    []byte NoUpdate
 );
 
-TABLE sessions OF Session NoUpdate (
+TABLE networks OF Network (
-  SessionID  string PK,
+  NetworkID int64 PK,
-  CSRF       string,
+  Name      string NoUpdate,
-  SignedIn   bool,
+  Network   []byte NoUpdate
-  CreatedAt  int64,
-  LastSeenAt int64
 );
 
 TABLE peers OF Peer (
+  NetworkID  int64 PK,
   PeerIP     byte PK,
   Version    int64,
   APIKey     string NoUpdate,
   Name       string,
-  PublicIP   []byte,
+  PublicIP1  []byte,
-  Port       uint16,
+  Port1      uint16,
+  PublicIP2  []byte,
+  Port2      uint16,
   Relay      bool,
-  PubKey     []byte NoUpdate
+  WGPubKey   []byte NoUpdate
 );

hub/api/db/written.go

@@ -1,41 +1,8 @@
 package db
 
-import "time"
+func Peer_ListAll(tx TX, networkID int64) ([]*Peer, error) {
-
+	const query = Peer_SelectQuery + ` WHERE NetworkID=? ORDER BY PeerIP ASC`
-func Session_UpdateLastSeenAt(
+	return Peer_List(tx, query, networkID)
-	tx TX,
-	id string,
-) (err error) {
-	_, err = tx.Exec("UPDATE sessions SET LastSeenAt=? WHERE SessionID=?", time.Now().Unix(), id)
-	return err
-}
-
-func Session_SetSignedIn(
-	tx TX,
-	id string,
-) (err error) {
-	_, err = tx.Exec("UPDATE sessions SET SignedIn=1 WHERE SessionID=?", id)
-	return err
-}
-
-func Session_DeleteBefore(
-	tx TX,
-	timestamp int64,
-) (err error) {
-	_, err = tx.Exec("DELETE FROM sessions WHERE LastSeenAt<?", timestamp)
-	return err
-}
-
-func Config_UpdatePassword(
-	tx TX,
-	pwdHash []byte,
-) (err error) {
-	_, err = tx.Exec("UPDATE config SET Password=? WHERE ConfigID=1", pwdHash)
-	return err
-}
-
-func Peer_ListAll(tx TX) ([]*Peer, error) {
-	return Peer_List(tx, Peer_SelectQuery)
 }
 
 func Peer_GetByAPIKey(tx TX, apiKey string) (*Peer, error) {
@@ -45,7 +12,8 @@ func Peer_GetByAPIKey(tx TX, apiKey string) (*Peer, error) {
 		apiKey)
 }
 
-func Peer_Exists(tx TX, ip byte) (exists bool, err error) {
+func Peer_Exists(tx TX, networkID int64, ip byte) (exists bool, err error) {
-	err = tx.QueryRow(`SELECT EXISTS(SELECT 1 FROM peers WHERE PeerIP=?)`, ip).Scan(&exists)
+	const query = `SELECT EXISTS(SELECT 1 FROM peers WHERE NetworkID=? AND PeerIP=?)`
+	err = tx.QueryRow(query, networkID, ip).Scan(&exists)
 	return
 }

hub/api/migrations/2024-11-30-init.sql

@@ -1,27 +1,25 @@
 CREATE TABLE config (
   ConfigID    INTEGER NOT NULL PRIMARY KEY, -- Always 1.
-  HubAddress  TEXT    NOT NULL, -- https://for.example.com
-  VPNNetwork  BLOB    NOT NULL, -- Network (/24), example 10.51.50.0
   Password    BLOB    NOT NULL  -- bcrypt password for web interface
 ) WITHOUT ROWID;
 
-CREATE TABLE sessions (
+CREATE TABLE networks (
-  SessionID  TEXT    NOT NULL PRIMARY KEY,
+  NetworkID   INTEGER NOT NULL PRIMARY KEY,
-  CSRF       TEXT    NOT NULL,
+  Name        TEXT    NOT NULL UNIQUE, -- Network/interface name.
-  SignedIn   INTEGER NOT NULL,
+  Network     BLOB    NOT NULL UNIQUE  -- Network (/24), example 10.51.50.0
-  CreatedAt  INTEGER NOT NULL,
-  LastSeenAt INTEGER NOT NULL
 ) WITHOUT ROWID;
 
-CREATE INDEX sessions_last_seen_index ON sessions(LastSeenAt);
-
 CREATE TABLE peers (
-  PeerIP     INTEGER NOT NULL PRIMARY KEY, -- Final byte.
+  NetworkID  INTEGER NOT NULL,
-  Version    INTEGER NOT NULL,
+  PeerIP     INTEGER NOT NULL,           -- Final byte of IP.
-  APIKey     TEXT    NOT NULL UNIQUE,
+  Version    INTEGER NOT NULL,           -- Changes when updated.
+  APIKey     TEXT    NOT NULL UNIQUE,    -- Peer's secret API key.
   Name       TEXT    NOT NULL UNIQUE,    -- For humans.
-  PublicIP   BLOB    NOT NULL,
+  PublicIP1  BLOB    NOT NULL,
-  Port       INTEGER NOT NULL,
+  Port1      INTEGER NOT NULL,
-  Relay      INTEGER NOT NULL DEFAULT 0,   -- Boolean if peer will forward packets. Must also have public address.
+  PublicIP2  BLOB    NOT NULL,
-  PubKey     BLOB    NOT NULL
+  Port2      INTEGER NOT NULL,
+  Relay      INTEGER NOT NULL DEFAULT 0, -- Boolean if peer will forward packets.
+  WGPubKey   BLOB    NOT NULL,
+  PRIMARY KEY(NetworkID, PeerIP)
 ) WITHOUT ROWID;

hub/api/session.go

@@ -1 +0,0 @@
-package api

hub/api/types.go

@@ -3,5 +3,12 @@ package api
 import "vppn/hub/api/db"
 
 type Config = db.Config
-type Session = db.Session
+type Network = db.Network
 type Peer = db.Peer
+
+type Session struct {
+	SessionID  string
+	SignedIn   bool
+	CreatedAt  int64
+	LastSeenAt int64
+}

hub/app.go

@@ -2,12 +2,13 @@ package hub
 
 import (
 	"embed"
+	"encoding/base64"
 	"html/template"
 	"net/http"
 	"path/filepath"
 	"vppn/hub/api"
 
-	"git.crumpington.com/lib/webutil"
+	"git.crumpington.com/lib/go/webutil"
 )
 
 //go:embed static
@@ -19,14 +20,14 @@ var templateFS embed.FS
 type Config struct {
 	RootDir    string
 	ListenAddr string
-	Secure     bool
+	Insecure   bool
 }
 
 type App struct {
 	api      *api.API
 	mux      *http.ServeMux
 	tmpl     map[string]*template.Template
-	secure bool
+	insecure bool
 }
 
 func NewApp(conf Config) (*App, error) {
@@ -39,7 +40,7 @@ func NewApp(conf Config) (*App, error) {
 		api:      api,
 		mux:      http.NewServeMux(),
 		tmpl:     webutil.ParseTemplateSet(templateFuncs, templateFS),
-		secure: conf.Secure,
+		insecure: conf.Insecure,
 	}
 
 	app.registerRoutes()
@@ -47,6 +48,19 @@ func NewApp(conf Config) (*App, error) {
 	return app, nil
 }
 
+func (app *App) Handler() http.Handler {
+	cop := http.NewCrossOriginProtection()
+	return cop.Handler(app.mux)
+}
+
 var templateFuncs = template.FuncMap{
 	"ipToString":  ipBytesTostring,
+	"wgKeyString": wgKeyString,
+}
+
+func wgKeyString(key []byte) string {
+	if len(key) == 0 {
+		return "not set"
+	}
+	return base64.StdEncoding.EncodeToString(key)
 }

hub/cookie.go

@@ -17,8 +17,9 @@ func (a *App) setCookie(w http.ResponseWriter, name, value string) {
 		Name:     name,
 		Value:    value,
 		Path:     "/",
-		Secure:   a.secure,
+		Secure:   !a.insecure,
 		SameSite: http.SameSiteStrictMode,
+		HttpOnly: true,
 		MaxAge:   86400 * 365 * 10,
 	})
 }

hub/form.go

@@ -0,0 +1,42 @@
+package hub
+
+import (
+	"net/url"
+	"vppn/hub/api"
+
+	"git.crumpington.com/lib/go/webutil"
+)
+
+func (app *App) formGetNetwork(form url.Values) (*api.Network, error) {
+	var id int64
+	if err := webutil.NewFormScanner(form).Scan("NetworkID", &id).Error(); err != nil {
+		return nil, err
+	}
+
+	return app.api.Network_Get(id)
+}
+
+func (app *App) formGetNetworkPeers(form url.Values) (*api.Network, []*api.Peer, error) {
+	n, err := app.formGetNetwork(form)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	peers, err := app.api.Peer_List(n.NetworkID)
+	return n, peers, err
+}
+
+func (app *App) formGetPeer(form url.Values) (*api.Network, *api.Peer, error) {
+	net, err := app.formGetNetwork(form)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var ip byte
+	if err := webutil.NewFormScanner(form).Scan("PeerIP", &ip).Error(); err != nil {
+		return nil, nil, err
+	}
+
+	peer, err := app.api.Peer_Get(net.NetworkID, ip)
+	return net, peer, err
+}

hub/handler.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 	"vppn/hub/api"
 
-	"git.crumpington.com/lib/webutil"
+	"git.crumpington.com/lib/go/webutil"
 )
 
 type handlerFunc func(s *api.Session, w http.ResponseWriter, r *http.Request) error
@@ -26,11 +26,6 @@ func (app *App) handlePub(pattern string, fn handlerFunc) {
 
 		if r.Method == http.MethodPost {
 			r.ParseMultipartForm(64 * 1024)
-			if r.FormValue("CSRF") != s.CSRF {
-				log.Printf("%s != %s", r.FormValue("CSRF"), s.CSRF)
-				http.Error(w, "CSRF mismatch", http.StatusBadRequest)
-				return
-			}
 		} else {
 			r.ParseForm()
 		}
@@ -65,13 +60,26 @@ func (app *App) handleSignedIn(pattern string, fn handlerFunc) {
 	})
 }
 
-type peerHandlerFunc func(w http.ResponseWriter, r *http.Request) error
+type peerHandlerFunc func(p *api.Peer, w http.ResponseWriter, r *http.Request) error
 
 func (app *App) handlePeer(pattern string, fn peerHandlerFunc) {
 	wrapped := func(w http.ResponseWriter, r *http.Request) {
+		_, apiKey, ok := r.BasicAuth()
+		if !ok {
+			http.Error(w, "Not authorized", http.StatusUnauthorized)
+			return
+		}
+
+		peer, err := app.api.Peer_GetByAPIKey(apiKey)
+		if err != nil {
+			http.Error(w, "Not authorized", http.StatusUnauthorized)
+			return
+		}
+
 		r.ParseForm()
-		if err := fn(w, r); err != nil {
+		if err := fn(peer, w, r); err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
 		}
 	}
 

hub/handlers.go

@@ -1,11 +1,10 @@
 package hub
 
 import (
+	"encoding/json"
 	"errors"
 	"log"
 	"net/http"
-	"net/netip"
-	"strings"
 	"vppn/hub/api"
 	"vppn/m"
 
@@ -15,7 +14,7 @@ import (
 
 func (a *App) _root(s *api.Session, w http.ResponseWriter, r *http.Request) error {
 	if s.SignedIn {
-		return a.redirect(w, r, "/admin/config/")
+		return a.redirect(w, r, "/admin/network/list/")
 	} else {
 		return a.redirect(w, r, "/sign-in/")
 	}
@@ -53,47 +52,208 @@ func (a *App) _adminSignOutSubmit(s *api.Session, w http.ResponseWriter, r *http
 	return a.redirect(w, r, "/")
 }
 
-func (a *App) _adminConfig(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+func (a *App) _adminNetworkList(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	return a.render("/admin-config.html", w, struct {
+	l, err := a.api.Network_List()
+	if err != nil {
+		return err
+	}
+	return a.render("/admin-network-list.html", w, struct {
 		Session  *api.Session
-		Config  *api.Config
+		Networks []*api.Network
-	}{
+	}{s, l})
-		s,
-		a.api.Config_Get(),
-	})
 }
 
-func (a *App) _adminConfigEdit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+func (a *App) _adminNetworkCreate(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	return a.render("/admin-config-edit.html", w, struct {
+	return a.render("/admin-network-create.html", w, struct{ Session *api.Session }{s})
-		Session *api.Session
-		Config  *api.Config
-	}{
-		s,
-		a.api.Config_Get(),
-	})
 }
 
-func (a *App) _adminConfigEditSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+func (a *App) _adminNetworkCreateSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	var (
+	n := &api.Network{}
-		conf  = a.api.Config_Get()
+	var netStr string
-		ipStr string
-	)
 
 	err := webutil.NewFormScanner(r.Form).
-		Scan("HubAddress", &conf.HubAddress).
+		Scan("Name", &n.Name).
-		Scan("VPNNetwork", &ipStr).
+		Scan("Network", &netStr).
 		Error()
 	if err != nil {
 		return err
 	}
 
-	if conf.VPNNetwork, err = stringToIP(ipStr); err != nil {
+	n.Network, err = stringToIP(netStr)
+	if err != nil {
 		return err
 	}
-	if err := a.api.Config_Update(conf); err != nil {
+
+	if err := a.api.Network_Create(n); err != nil {
 		return err
 	}
-	return a.redirect(w, r, "/admin/config/")
+
+	return a.redirect(w, r, "/admin/network/view/?NetworkID=%d", n.NetworkID)
+}
+
+func (a *App) _adminNetworkView(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	n, peers, err := a.formGetNetworkPeers(r.Form)
+	if err != nil {
+		return err
+	}
+
+	return a.render("/network/network-view.html", w, struct {
+		Session *api.Session
+		Network *api.Network
+		Peers   []*api.Peer
+	}{s, n, peers})
+}
+
+func (a *App) _adminNetworkDelete(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	n, peers, err := a.formGetNetworkPeers(r.Form)
+	if err != nil {
+		return err
+	}
+
+	return a.render("/network/network-delete.html", w, struct {
+		Session *api.Session
+		Network *api.Network
+		Peers   []*api.Peer
+	}{s, n, peers})
+}
+
+func (a *App) _adminNetworkDeleteSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	n, err := a.formGetNetwork(r.Form)
+	if err != nil {
+		return err
+	}
+
+	if err = a.api.Network_Delete(n); err != nil {
+		return err
+	}
+	return a.redirect(w, r, "/admin/network/list/")
+}
+
+func (a *App) _adminPeerCreate(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	n, err := a.formGetNetwork(r.Form)
+	if err != nil {
+		return err
+	}
+
+	return a.render("/network/peer-create.html", w, struct {
+		Session *api.Session
+		Network *api.Network
+	}{s, n})
+}
+
+func (a *App) _adminPeerCreateSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	var ip1Str, ip2Str string
+
+	p := &api.Peer{}
+	err := webutil.NewFormScanner(r.Form).
+		Scan("NetworkID", &p.NetworkID).
+		Scan("IP", &p.PeerIP).
+		Scan("Name", &p.Name).
+		Scan("PublicIP1", &ip1Str).
+		Scan("Port1", &p.Port1).
+		Scan("PublicIP2", &ip2Str).
+		Scan("Port2", &p.Port2).
+		Scan("Relay", &p.Relay).
+		Error()
+	if err != nil {
+		return err
+	}
+
+	if p.PublicIP1, err = stringToIP(ip1Str); err != nil {
+		return err
+	}
+	if p.PublicIP2, err = stringToIP(ip2Str); err != nil {
+		return err
+	}
+
+	if err := a.api.Peer_CreateNew(p); err != nil {
+		return err
+	}
+	return a.redirect(w, r, "/admin/peer/view/?NetworkID=%d&PeerIP=%d", p.NetworkID, p.PeerIP)
+}
+
+func (a *App) _adminPeerView(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	net, peer, err := a.formGetPeer(r.Form)
+	if err != nil {
+		return err
+	}
+
+	return a.render("/network/peer-view.html", w, struct {
+		Session *api.Session
+		Network *api.Network
+		Peer    *api.Peer
+	}{s, net, peer})
+}
+
+func (a *App) _adminPeerEdit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	net, peer, err := a.formGetPeer(r.Form)
+	if err != nil {
+		return err
+	}
+
+	return a.render("/network/peer-edit.html", w, struct {
+		Session *api.Session
+		Network *api.Network
+		Peer    *api.Peer
+	}{s, net, peer})
+}
+
+func (a *App) _adminPeerEditSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	_, peer, err := a.formGetPeer(r.Form)
+	if err != nil {
+		return err
+	}
+
+	var ip1Str, ip2Str string
+
+	err = webutil.NewFormScanner(r.Form).
+		Scan("Name", &peer.Name).
+		Scan("PublicIP1", &ip1Str).
+		Scan("Port1", &peer.Port1).
+		Scan("PublicIP2", &ip2Str).
+		Scan("Port2", &peer.Port2).
+		Scan("Relay", &peer.Relay).
+		Error()
+	if err != nil {
+		return err
+	}
+
+	if peer.PublicIP1, err = stringToIP(ip1Str); err != nil {
+		return err
+	}
+	if peer.PublicIP2, err = stringToIP(ip2Str); err != nil {
+		return err
+	}
+
+	if err = a.api.Peer_Update(peer); err != nil {
+		return err
+	}
+
+	return a.redirect(w, r, "/admin/peer/view/?NetworkID=%d&PeerIP=%d", peer.NetworkID, peer.PeerIP)
+}
+
+func (a *App) _adminPeerDelete(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	n, peer, err := a.formGetPeer(r.Form)
+	if err != nil {
+		return err
+	}
+
+	return a.render("/network/peer-delete.html", w, struct {
+		Session *api.Session
+		Network *api.Network
+		Peer    *api.Peer
+	}{s, n, peer})
+}
+
+func (a *App) _adminPeerDeleteSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	n, peer, err := a.formGetPeer(r.Form)
+	if err != nil {
+		return err
+	}
+	if err := a.api.Peer_Delete(n.NetworkID, peer.PeerIP); err != nil {
+		return err
+	}
+	return a.redirect(w, r, "/admin/network/view/?NetworkID=%d", n.NetworkID)
 }
 
 func (a *App) _adminPasswordEdit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
@@ -135,241 +295,78 @@ func (a *App) _adminPasswordSubmit(s *api.Session, w http.ResponseWriter, r *htt
 		return err
 	}
 
-	if err := a.api.Config_UpdatePassword(hash); err != nil {
+	conf.Password = hash
+
+	if err := a.api.Config_Update(conf); err != nil {
 		return err
 	}
 
 	return a.redirect(w, r, "/admin/config/")
 }
 
-func (a *App) _adminPeerList(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+func (a *App) _peerInit(peer *api.Peer, w http.ResponseWriter, r *http.Request) error {
-	peers, err := a.api.Peer_List()
+	if len(peer.WGPubKey) != 0 {
-	if err != nil {
+		http.Error(w, "Already initialized", http.StatusConflict)
-		return err
-	}
-
-	return a.render("/admin-peer-list.html", w, struct {
-		Session *api.Session
-		Peers   []*api.Peer
-	}{
-		s,
-		peers,
-	})
-}
-
-func (a *App) _adminHosts(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	conf := a.api.Config_Get()
-
-	peers, err := a.api.Peer_List()
-	if err != nil {
-		return err
-	}
-
-	b := strings.Builder{}
-
-	for _, peer := range peers {
-		ip := conf.VPNNetwork
-		ip[3] = peer.PeerIP
-		b.WriteString(netip.AddrFrom4([4]byte(ip)).String())
-		b.WriteString(" ")
-		b.WriteString(peer.Name)
-		b.WriteString("\n")
-	}
-
-	w.Write([]byte(b.String()))
 		return nil
-}
+	}
 
-func (a *App) _adminPeerCreate(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	args := m.PeerInitArgs{}
-	return a.render("/admin-peer-create.html", w, struct{ Session *api.Session }{s})
+	if err := json.NewDecoder(r.Body).Decode(&args); err != nil {
-}
+		return err
+	}
 
-func (a *App) _adminPeerCreateSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
+	net, err := a.api.Network_Get(peer.NetworkID)
-	var ipStr string
-
-	args := api.PeerCreateArgs{}
-	err := webutil.NewFormScanner(r.Form).
-		Scan("Name", &args.Name).
-		Scan("PublicIP", &ipStr).
-		Scan("Port", &args.Port).
-		Scan("Relay", &args.Relay).
-		Error()
 	if err != nil {
 		return err
 	}
 
-	if args.PublicIP, err = stringToIP(ipStr); err != nil {
+	if err := a.api.Peer_Init(peer, args); err != nil {
 		return err
 	}
 
-	code := a.api.Peer_CreateIntent(args)
+	resp := m.PeerInitResp{
-	return a.redirect(w, r, "/admin/peer/intent-created/?Code=%s", code)
-}
-
-func (a *App) _adminPeerIntentCreated(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	code := r.FormValue("Code")
-	if code == "" {
-		return errors.New("missing Code")
-	}
-
-	return a.render("/admin-peer-intent.html", w, struct {
-		Session    *api.Session
-		HubAddress string
-		Code       string
-	}{s, a.api.Config_Get().HubAddress, code})
-}
-
-func (a *App) _adminPeerView(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	var peerIP byte
-	err := webutil.NewFormScanner(r.Form).Scan("PeerIP", &peerIP).Error()
-	if err != nil {
-		return err
-	}
-
-	peer, err := a.api.Peer_Get(peerIP)
-	if err != nil {
-		return err
-	}
-
-	return a.render("/admin-peer-view.html", w, struct {
-		Session *api.Session
-		Peer    *api.Peer
-	}{s, peer})
-}
-
-func (a *App) _adminPeerEdit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	var peerIP byte
-	err := webutil.NewFormScanner(r.Form).Scan("PeerIP", &peerIP).Error()
-	if err != nil {
-		return err
-	}
-
-	peer, err := a.api.Peer_Get(peerIP)
-	if err != nil {
-		return err
-	}
-
-	return a.render("/admin-peer-edit.html", w, struct {
-		Session *api.Session
-		Peer    *api.Peer
-	}{s, peer})
-}
-
-func (a *App) _adminPeerEditSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	var (
-		peerIP byte
-		ipStr  string
-	)
-
-	err := webutil.NewFormScanner(r.Form).Scan("PeerIP", &peerIP).Error()
-	if err != nil {
-		return err
-	}
-
-	peer, err := a.api.Peer_Get(peerIP)
-	if err != nil {
-		return err
-	}
-	err = webutil.NewFormScanner(r.Form).
-		Scan("Name", &peer.Name).
-		Scan("PublicIP", &ipStr).
-		Scan("Port", &peer.Port).
-		Scan("Relay", &peer.Relay).
-		Error()
-	if err != nil {
-		return err
-	}
-
-	if peer.PublicIP, err = stringToIP(ipStr); err != nil {
-		return err
-	}
-
-	if err = a.api.Peer_Update(peer); err != nil {
-		return err
-	}
-
-	return a.redirect(w, r, "/admin/peer/view/?PeerIP=%d", peer.PeerIP)
-}
-
-func (a *App) _adminPeerDelete(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	var peerIP byte
-	err := webutil.NewFormScanner(r.Form).Scan("PeerIP", &peerIP).Error()
-	if err != nil {
-		return err
-	}
-
-	peer, err := a.api.Peer_Get(peerIP)
-	if err != nil {
-		return err
-	}
-
-	return a.render("/admin-peer-delete.html", w, struct {
-		Session *api.Session
-		Peer    *api.Peer
-	}{s, peer})
-}
-
-func (a *App) _adminPeerDeleteSubmit(s *api.Session, w http.ResponseWriter, r *http.Request) error {
-	var peerIP byte
-	err := webutil.NewFormScanner(r.Form).Scan("PeerIP", &peerIP).Error()
-	if err != nil {
-		return err
-	}
-
-	if err := a.api.Peer_Delete(peerIP); err != nil {
-		return err
-	}
-
-	return a.redirect(w, r, "/admin/peer/list/")
-}
-
-func (a *App) _peerCreate(w http.ResponseWriter, r *http.Request) error {
-	code := r.FormValue("Code")
-	conf, err := a.api.Peer_Create(code)
-	if err != nil {
-		return err
-	}
-
-	return a.sendJSON(w, conf)
-}
-
-func (a *App) _peerFetchState(w http.ResponseWriter, r *http.Request) error {
-	_, apiKey, ok := r.BasicAuth()
-	if !ok {
-		return api.ErrNotAuthorized
-	}
-
-	peer, err := a.api.Peer_GetByAPIKey(apiKey)
-	if err != nil {
-		return err
-	}
-
-	peers, err := a.api.Peer_List()
-	if err != nil {
-		return err
-	}
-
-	conf := a.api.Config_Get()
-
-	state := m.NetworkState{
-		HubAddress: conf.HubAddress,
-		Network:    conf.VPNNetwork,
 		PeerIP:  peer.PeerIP,
-		PublicIP:   peer.PublicIP,
+		Network: net.Network,
-		Port:       peer.Port,
 	}
 
-	for _, p := range peers {
+	resp.NetworkState.Peers, err = a.peersArray(net.NetworkID)
-		state.Peers[p.PeerIP] = &m.Peer{
+	if err != nil {
+		return err
+	}
+
+	return a.sendJSON(w, resp)
+}
+
+func (a *App) _peerFetchState(peer *api.Peer, w http.ResponseWriter, r *http.Request) error {
+
+	peers, err := a.peersArray(peer.NetworkID)
+	if err != nil {
+		return err
+	}
+	return a.sendJSON(w, m.NetworkState{Peers: peers})
+}
+
+func (a *App) peersArray(networkID int64) (peers [256]*m.Peer, err error) {
+	l, err := a.api.Peer_List(networkID)
+	if err != nil {
+		return peers, err
+	}
+
+	for _, p := range l {
+		if len(p.WGPubKey) != 0 {
+			peers[p.PeerIP] = &m.Peer{
 				PeerIP:    p.PeerIP,
 				Version:   p.Version,
 				Name:      p.Name,
-			PublicIP: p.PublicIP,
+				PublicIP1: p.PublicIP1,
-			Port:     p.Port,
+				Port1:     p.Port1,
+				PublicIP2: p.PublicIP2,
+				Port2:     p.Port2,
 				Relay:     p.Relay,
-			PubKey:   p.PubKey,
+				WGPubKey:  p.WGPubKey,
+			}
 		}
 	}
 
-	return a.sendJSON(w, state)
+	return
 }

hub/main.go

@@ -6,7 +6,7 @@ import (
 	"net/http"
 	"os"
 
-	"git.crumpington.com/lib/webutil"
+	"git.crumpington.com/lib/go/webutil"
 )
 
 func Main() {
@@ -15,7 +15,7 @@ func Main() {
 	conf := Config{}
 	flag.StringVar(&conf.RootDir, "root-dir", "", "[REQUIRED] Root directory.")
 	flag.StringVar(&conf.ListenAddr, "listen", "", "[REQUIRED] Listen address.")
-	flag.BoolVar(&conf.Secure, "secure", false, "Use secure cookies.")
+	flag.BoolVar(&conf.Insecure, "insecure", false, "Don't use secure cookies.")
 
 	flag.Parse()
 
@@ -31,7 +31,7 @@ func Main() {
 
 	srv := &http.Server{
 		Addr:    conf.ListenAddr,
-		Handler: app.mux,
+		Handler: app.Handler(),
 	}
 
 	log.Fatal(webutil.ListenAndServe(srv))

hub/routes.go

@@ -9,24 +9,27 @@ func (a *App) registerRoutes() {
 	a.handleNotSignedIn("GET  /sign-in/", a._signin)
 	a.handleNotSignedIn("POST /sign-in/", a._signinSubmit)
 
-	a.handleSignedIn("GET  /admin/config/", a._adminConfig)
-	a.handleSignedIn("GET  /admin/config/edit/", a._adminConfigEdit)
-	a.handleSignedIn("POST /admin/config/edit/", a._adminConfigEditSubmit)
 	a.handleSignedIn("GET  /admin/sign-out/", a._adminSignOut)
 	a.handleSignedIn("POST /admin/sign-out/", a._adminSignOutSubmit)
-	a.handleSignedIn("GET  /admin/password/edit/", a._adminPasswordEdit)
+
-	a.handleSignedIn("POST /admin/password/edit/", a._adminPasswordSubmit)
+	a.handleSignedIn("GET  /admin/network/list/", a._adminNetworkList)
-	a.handleSignedIn("GET  /admin/peer/list/", a._adminPeerList)
+	a.handleSignedIn("GET  /admin/network/create/", a._adminNetworkCreate)
-	a.handleSignedIn("GET  /admin/peer/hosts/", a._adminHosts)
+	a.handleSignedIn("POST /admin/network/create/", a._adminNetworkCreateSubmit)
+	a.handleSignedIn("GET  /admin/network/delete/", a._adminNetworkDelete)
+	a.handleSignedIn("POST /admin/network/delete/", a._adminNetworkDeleteSubmit)
+
+	a.handleSignedIn("GET  /admin/network/view/", a._adminNetworkView)
 	a.handleSignedIn("GET  /admin/peer/create/", a._adminPeerCreate)
 	a.handleSignedIn("POST /admin/peer/create/", a._adminPeerCreateSubmit)
-	a.handleSignedIn("GET  /admin/peer/intent-created/", a._adminPeerIntentCreated)
 	a.handleSignedIn("GET  /admin/peer/view/", a._adminPeerView)
 	a.handleSignedIn("GET  /admin/peer/edit/", a._adminPeerEdit)
 	a.handleSignedIn("POST /admin/peer/edit/", a._adminPeerEditSubmit)
 	a.handleSignedIn("GET  /admin/peer/delete/", a._adminPeerDelete)
 	a.handleSignedIn("POST /admin/peer/delete/", a._adminPeerDeleteSubmit)
 
-	a.handlePeer("GET /peer/create/", a._peerCreate)
+	a.handleSignedIn("GET  /admin/password/edit/", a._adminPasswordEdit)
+	a.handleSignedIn("POST /admin/password/edit/", a._adminPasswordSubmit)
+
+	a.handlePeer("POST /peer/init/", a._peerInit)
 	a.handlePeer("GET /peer/fetch-state/", a._peerFetchState)
 }

hub/static/custom.css

@@ -1,7 +1,3 @@
-body {
-    max-width: 1920px;
-}
-
 .def-list tr td:first-child {
     text-align:right;
     width:1%;

hub/templates/admin-config-edit.html

@@ -1,20 +0,0 @@
-{{define "body" -}}
-<h2>Config</h2>
-
-<form method="POST">
-  <input type="hidden" name="CSRF" value="{{.Session.CSRF}}">
-  <p>
-    <label>Hub Address</label><br>
-    <input type="url" name="HubAddress" value="{{.Config.HubAddress}}">
-  </p>
-  <p>
-    <label>VPN Network</label><br>
-    <input type="text" name="VPNNetwork" value="{{ipToString .Config.VPNNetwork}}">
-  </p>
-  <p>
-    <button type="submit">Save</button>
-    <a href="/admin/config/">Cancel</a>
-  </p>
-</form>
-
-{{- end}}

hub/templates/admin-config.html

@@ -1,19 +0,0 @@
-{{define "body" -}}
-<h2>Config</h2>
-
-<p>
-  <a href="/admin/config/edit/">Edit</a> /
-  <a href="/admin/password/edit/">Change Password</a>
-</p>
-
-<table class="def-list">
-  <tr>
-    <td>Hub Address</td>
-    <td>{{.Config.HubAddress}}</td>
-  </tr>
-  <tr>
-    <td>VPN Network</td>
-    <td>{{ipToString .Config.VPNNetwork}}</td>
-  </tr>
-</table>
-{{- end}}

hub/templates/admin-network-create.html

@@ -0,0 +1,18 @@
+{{define "body" -}}
+<h2>Create Network</h2>
+
+<form method="POST">
+<p>
+    <label>Name</label><br>
+    <input type="text" name="Name">
+  </p>
+  <p>
+    <label>Network /24</label><br>
+    <input type="text" name="Network">
+  </p>
+  <p>
+    <button type="submit">Save</button>
+    <a href="/admin/network/list/">Cancel</a>
+  </p>
+</form>
+{{- end}}

hub/templates/admin-network-list.html

@@ -0,0 +1,38 @@
+{{define "body" -}}
+<h2>Networks</h2>
+
+<p>
+  <a href="/admin/network/create/">Create</a>
+</p>
+
+{{if .Networks -}}
+<table>
+  <thead>
+    <tr>
+      <th>Name</th>
+      <th>Network</th>
+    </tr>
+  </thead>
+  <tbody>
+  {{range .Networks -}}
+  <tr>
+    <td>
+      <a href="/admin/network/view/?NetworkID={{.NetworkID}}">
+        {{.Name}}
+      </a>
+    </td>
+    <td>{{ipToString .Network}}</td>
+  </tr>
+  </tbody>
+  {{- end}}
+</table>
+{{- else}}
+<p>No networks.</p>
+{{- end}}
+
+<h3>Settings</h3>
+
+<ul>
+  <li><a href="/admin/password/edit/">Password</a></li>
+</ul>
+{{- end}}

hub/templates/admin-password-edit.html

@@ -2,8 +2,7 @@
 <h2>Change Password</h2>
 
 <form method="POST">
-  <input type="hidden" name="CSRF" value="{{.Session.CSRF}}">
+<p>
-  <p>
     <label>Current Password</label><br>
     <input type="password" name="CurrentPassword">
   </p>

hub/templates/admin-peer-create.html

@@ -1,30 +0,0 @@
-{{define "body" -}}
-<h2>New Peer</h2>
-
-<form method="POST">
-  <input type="hidden" name="CSRF" value="{{.Session.CSRF}}">
-  <p>
-    <label>Name</label><br>
-    <input type="text" name="Name">
-  </p>
-  <p>
-    <label>Public IP</label><br>
-    <input type="text" name="PublicIP">
-  </p>
-  <p>
-    <label>Port</label><br>
-    <input type="number" name="Port" value="456">
-  </p>
-  <p>
-    <label>
-      <input type="checkbox" name="Relay">
-      Relay
-    </label>
-  </p>
-  <p>
-    <button type="submit">Save</button>
-    <a href="/admin/config/">Cancel</a>
-  </p>
-</form>
-
-{{- end}}

hub/templates/admin-peer-delete.html

@@ -1,36 +0,0 @@
-{{define "body" -}}
-<h2>Delete Peer</h2>
-
-{{with .Peer -}}
-<form method="POST">
-  <input type="hidden" name="CSRF" value="{{$.Session.CSRF}}">
-  <p>
-    <label>Peer IP</label><br>
-    <input type="number" name="PeerIP" value="{{.PeerIP}}" disabled>
-  </p>
-  <p>
-    <label>Name</label><br>
-    <input type="text" value="{{.Name}}" disabled>
-  </p>
-  <p>
-    <label>Public IP</label><br>
-    <input type="text" value="{{ipToString .PublicIP}}" disabled>
-  </p>
-  <p>
-    <label>Port</label><br>
-    <input type="number" value="{{.Port}}" disabled>
-  </p>
-  <p>
-    <label>
-      <input type="checkbox" {{if .Relay}}checked{{end}} disabled>
-      Relay
-    </label>
-  </p>
-  <p>
-    <button type="submit">Delete</button>
-    <a href="/admin/peer/view/?PeerIP={{.PeerIP}}">Cancel</a>
-  </p>
-</form>
-{{- end}}
-
-{{- end}}

hub/templates/admin-peer-edit.html

@@ -1,36 +0,0 @@
-{{define "body" -}}
-<h2>Edit Peer</h2>
-
-{{with .Peer -}}
-<form method="POST">
-  <input type="hidden" name="CSRF" value="{{$.Session.CSRF}}">
-  <p>
-    <label>Peer IP</label><br>
-    <input type="number" name="PeerIP" value="{{.PeerIP}}" disabled>
-  </p>
-  <p>
-    <label>Name</label><br>
-    <input type="text" name="Name" value="{{.Name}}">
-  </p>
-  <p>
-    <label>Public IP</label><br>
-    <input type="text" name="PublicIP" value="{{ipToString .PublicIP}}">
-  </p>
-  <p>
-    <label>Port</label><br>
-    <input type="number" name="Port" value="{{.Port}}">
-  </p>
-  <p>
-    <label>
-      <input type="checkbox" name="Relay" {{if .Relay}}checked{{end}}>
-      Relay
-    </label>
-  </p>
-  <p>
-    <button type="submit">Save</button>
-    <a href="/admin/peer/view/?PeerIP={{.PeerIP}}">Cancel</a>
-  </p>
-</form>
-{{- end}}
-
-{{- end}}

hub/templates/admin-peer-intent.html

@@ -1,13 +0,0 @@
-{{define "body" -}}
-<h2>Create Peer</h2>
-
-<p>
-  Configure the peer with the following URL:
-</p>
-<pre>
-  {{.HubAddress}}/peer/create/?Code={{.Code}}
-</pre>
-<p>
-  <a href="/admin/peer/list/">Done</a>
-</p>
-{{- end}}

hub/templates/admin-peer-list.html

@@ -1,40 +0,0 @@
-{{define "body" -}}
-<h2>Peers</h2>
-
-<p>
-  <a href="/admin/peer/create/">Add Peer</a> /
-  <a href="/admin/peer/hosts/">Hosts</a>
-</p>
-
-{{if .Peers -}}
-<table>
-  <thead>
-    <tr>
-      <th>PeerIP</th>
-      <th>Name</th>
-      <th>Public IP</th>
-      <th>Port</th>
-      <th>Relay</th>
-    </tr>
-  </thead>
-  <tbody>
-  {{range .Peers -}}
-  <tr>
-    <td>
-      <a href="/admin/peer/view/?PeerIP={{.PeerIP}}">
-        {{.PeerIP}}
-      </a>
-    </td>
-    <td>{{.Name}}</td>
-    <td>{{ipToString .PublicIP}}</td>
-    <td>{{.Port}}</td>
-    <td>{{if .Relay}}T{{else}}F{{end}}</td>
-  </tr>
-  </tbody>
-  {{- end}}
-</table>
-{{- else}}
-<p>No peers.</p>
-{{- end}}
-
-{{- end}}

hub/templates/admin-peer-view.html

@@ -1,20 +0,0 @@
-{{define "body" -}}
-<h2>Peer</h2>
-
-<p>
-  <a href="/admin/peer/edit/?PeerIP={{.Peer.PeerIP}}">Edit</a> /
-  <a href="/admin/peer/delete/?PeerIP={{.Peer.PeerIP}}">Delete</a>
-</p>
-
-{{with .Peer -}}
-<table class="def-list">
-  <tr><td>Peer IP</td><td>{{.PeerIP}}</td></tr>
-  <tr><td>Name</td><td>{{.Name}}</td></tr>
-  <tr><td>Public IP</td><td>{{ipToString .PublicIP}}</td></tr>
-  <tr><td>Port</td><td>{{.Port}}</td></tr>
-  <tr><td>Relay</td><td>{{if .Relay}}T{{else}}F{{end}}</td></tr>
-  <tr><td>API Key</td><td>{{.APIKey}}</td></tr>
-</table>
-{{- end}}
-
-{{- end}}

hub/templates/admin-sign-out.html

@@ -2,10 +2,9 @@
 <h2>Sign Out</h2>
 
 <form method="POST">
-  <input type="hidden" name="CSRF" value="{{.Session.CSRF}}">
+<p>
-  <p>
     <button type="submit">Sign Out</button>
-    <a href="/admin/config/">Cancel</a>
+    <a href="/">Cancel</a>
   </p>
 </form>
 {{- end}}

hub/templates/base.html

@@ -10,8 +10,7 @@
     <h1>VPPN</h1>
     <nav>
       {{if .Session.SignedIn -}}
-      <a href="/admin/config/">Config</a> /
+      <a href="/admin/networks/list/">Home</a> /
-      <a href="/admin/peer/list/">Peers</a> /
       <a href="/admin/sign-out/">Sign out</a>
       {{- end}}
     </nav>

hub/templates/network/base.html

@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <title>VPPN Hub</title>
+  <link rel="stylesheet" href="/static/new.min.css">
+    <link rel="stylesheet" href="/static/custom.css">
+</head>
+<body>
+  <header>
+    <h1>VPPN</h1>
+    <nav>
+      {{if .Session.SignedIn -}}
+      <a href="/admin/networks/list/">Home</a> /
+      <a href="/admin/sign-out/">Sign out</a>
+      {{- end}}
+    </nav>
+  </header>
+  <h2>
+    Network:
+    <a href="/admin/network/view/?NetworkID={{.Network.NetworkID}}">{{.Network.Name}}</a>
+  </h2>
+
+  {{block "body" .}}There's nothing here.{{end}}
+</body>
+</html>

hub/templates/network/network-delete.html

@@ -0,0 +1,15 @@
+{{define "body" -}}
+<h3>Delete</h3>
+
+{{if .Peers -}}
+<p>You must first delete all peers.</p>
+{{- else -}}
+<form method="POST">
+<input type="hidden" name="NetworkID" value="{{.Network.NetworkID}}">
+  <p>
+    <button type="submit">Delete</button>
+    <a href="/admin/network/view/?NetworkID={{.Network.NetworkID}}">Cancel</a>
+  </p>
+</form>
+{{- end}}
+{{- end}}

hub/templates/network/network-view.html

@@ -0,0 +1,53 @@
+{{define "body" -}}
+<p>
+  <a href="/admin/network/delete/?NetworkID={{.Network.NetworkID}}">Delete</a>
+</p>
+
+<table class="def-list">
+  <tr>
+    <td>Network</td>
+    <td>{{ipToString .Network.Network}}/24</td>
+  </tr>
+</table>
+
+<h3>Peers</h3>
+
+<p>
+  <a href="/admin/peer/create/?NetworkID={{.Network.NetworkID}}">Create</a>
+</p>
+
+{{if .Peers -}}
+<table>
+  <thead>
+    <tr>
+      <th>PeerIP</th>
+      <th>Name</th>
+      <th>Public IP 1</th>
+      <th>Port 1</th>
+      <th>Public IP 2</th>
+      <th>Port 2</th>
+      <th>Relay</th>
+    </tr>
+  </thead>
+  <tbody>
+  {{range .Peers -}}
+  <tr>
+    <td>
+      <a href="/admin/peer/view/?NetworkID={{$.Network.NetworkID}}&PeerIP={{.PeerIP}}">
+        {{.PeerIP}}
+      </a>
+    </td>
+    <td>{{.Name}}</td>
+    <td>{{ipToString .PublicIP1}}</td>
+    <td>{{.Port1}}</td>
+    <td>{{ipToString .PublicIP2}}</td>
+    <td>{{.Port2}}</td>
+    <td>{{if .Relay}}T{{else}}F{{end}}</td>
+  </tr>
+  </tbody>
+  {{- end}}
+</table>
+{{- else}}
+<p>No peers.</p>
+{{- end}}
+{{- end}}

hub/templates/network/peer-create.html

@@ -0,0 +1,42 @@
+{{define "body" -}}
+<h3>New Peer</h3>
+
+<form method="POST">
+  <input type="hidden" name="NetworkID" value="{{.Network.NetworkID}}">
+  <p>
+    <label>IP</label><br>
+    <input type="number" name="IP" min="1" max="255" value="0">
+  </p>
+  <p>
+    <label>Name</label><br>
+    <input type="text" name="Name">
+  </p>
+  <p>
+    <label>Public IP 1</label><br>
+    <input type="text" name="PublicIP1">
+  </p>
+  <p>
+    <label>Port 1</label><br>
+    <input type="number" name="Port1" value="456">
+  </p>
+  <p>
+    <label>Public IP 2 (optional)</label><br>
+    <input type="text" name="PublicIP2">
+  </p>
+  <p>
+    <label>Port 2</label><br>
+    <input type="number" name="Port2" value="0">
+  </p>
+  <p>
+    <label>
+      <input type="checkbox" name="Relay">
+      Relay
+    </label>
+  </p>
+  <p>
+    <button type="submit">Save</button>
+    <a href="/admin/network/view/?NetworkID={{.Network.NetworkID}}">Cancel</a>
+  </p>
+</form>
+
+{{- end}}

hub/templates/network/peer-delete.html

@@ -0,0 +1,14 @@
+{{define "body" -}}
+<h3>Delete {{.Peer.Name}}</h3>
+
+{{with .Peer -}}
+<form method="POST">
+<input type="hidden" name="NetworkID" value="{{.NetworkID}}">
+  <input type="hidden" name="NetworkID" value="{{.PeerIP}}">
+  <p>
+    <button type="submit">Delete</button>
+    <a href="/admin/peer/view/?PeerIP={{.PeerIP}}&NetworkID={{.NetworkID}}">Cancel</a>
+  </p>
+</form>
+{{- end}}
+{{- end}}

hub/templates/network/peer-edit.html

@@ -0,0 +1,42 @@
+{{define "body" -}}
+<h2>Edit Peer</h2>
+
+{{with .Peer -}}
+<form method="POST">
+  <p>
+    <label>Peer IP</label><br>
+    <input type="text" value="{{.PeerIP}}" disabled>
+  </p>
+  <p>
+    <label>Name</label><br>
+    <input type="text" name="Name" value="{{.Name}}">
+  </p>
+  <p>
+    <label>Public IP 1</label><br>
+    <input type="text" name="PublicIP1" value="{{ipToString .PublicIP1}}">
+  </p>
+  <p>
+    <label>Port 1</label><br>
+    <input type="number" name="Port1" value="{{.Port1}}">
+  </p>
+  <p>
+    <label>Public IP 2 (optional)</label><br>
+    <input type="text" name="PublicIP2" value="{{ipToString .PublicIP2}}">
+  </p>
+  <p>
+    <label>Port 2</label><br>
+    <input type="number" name="Port2" value="{{.Port2}}">
+  </p>
+  <p>
+    <label>
+      <input type="checkbox" name="Relay" {{if .Relay}}checked{{end}}>
+      Relay
+    </label>
+  </p>
+  <p>
+    <button type="submit">Save</button>
+    <a href="/admin/peer/view/?NetworkID={{$.Network.NetworkID}}&PeerIP={{.PeerIP}}">Cancel</a>
+  </p>
+</form>
+{{- end}}
+{{- end}}

hub/templates/network/peer-view.html

@@ -0,0 +1,26 @@
+{{define "body" -}}
+<h3>{{.Peer.Name}}</h3>
+<p>
+  <a href="/admin/peer/edit/?NetworkID={{.Network.NetworkID}}&PeerIP={{.Peer.PeerIP}}">Edit</a> /
+  <a href="/admin/peer/delete/?NetworkID={{.Network.NetworkID}}&PeerIP={{.Peer.PeerIP}}">Delete</a>
+</p>
+
+{{with .Peer -}}
+<table class="def-list">
+  <tr><td>Peer IP</td><td>{{.PeerIP}}</td></tr>
+  <tr><td>Public IP 1</td><td>{{ipToString .PublicIP1}}</td></tr>
+  <tr><td>Port 1</td><td>{{.Port1}}</td></tr>
+  <tr><td>Public IP 2</td><td>{{ipToString .PublicIP2}}</td></tr>
+  <tr><td>Port 2</td><td>{{.Port2}}</td></tr>
+  <tr><td>Relay</td><td>{{if .Relay}}T{{else}}F{{end}}</td></tr>
+  <tr><td>WG Public Key</td><td>{{wgKeyString .WGPubKey}}</td></tr>
+</table>
+
+<details>
+  <summary>API Key</summary>
+  <p>{{.APIKey}}</p>
+</details>
+
+{{- end}}
+
+{{- end}}

hub/templates/sign-in.html

@@ -2,8 +2,7 @@
 <h2>Sign In</h2>
 
 <form method="POST">
-  <input type="hidden" name="CSRF" value="{{.Session.CSRF}}">
+<p>
-  <p>
     <label>Password</label><br>
     <input type="password" name="Password">
   </p>

hub/time.go

@@ -1 +0,0 @@
-package hub

m/models.go

@@ -1,37 +1,28 @@
 // The package `m` contains models shared between the hub and peer programs.
 package m
 
-type PeerConfig struct {
+type PeerInitArgs struct {
+	WGPubKey []byte
+}
+
+type PeerInitResp struct {
 	PeerIP       byte
-	HubAddress string
 	Network      []byte
-	APIKey     string
+	NetworkState NetworkState
-	PublicIP   []byte
-	Port       uint16
-	Relay      bool
-	PubKey     []byte
-	PrivKey    []byte
 }
 
 type Peer struct {
 	PeerIP    byte
 	Version   int64
 	Name      string
-	PublicIP []byte
+	PublicIP1 []byte
-	Port     uint16
+	Port1     uint16
+	PublicIP2 []byte
+	Port2     uint16
 	Relay     bool
-	PubKey   []byte
+	WGPubKey  []byte
 }
 
 type NetworkState struct {
-	HubAddress string
-
-	// The requester's data:
-	Network  []byte
-	PeerIP   byte
-	PublicIP []byte
-	Port     uint16
-
-	// All peer data.
 	Peers [256]*Peer
 }

node/addrdiscovery.go

@@ -1,71 +0,0 @@
-package node
-
-import (
-	"log"
-	"net/netip"
-	"time"
-)
-
-func addrDiscoveryServer() {
-	var (
-		buf1 = make([]byte, bufferSize)
-		buf2 = make([]byte, bufferSize)
-	)
-
-	for {
-		pkt := <-discoveryPackets
-
-		p, ok := pkt.Payload.(addrDiscoveryPacket)
-		if !ok {
-			continue
-		}
-
-		route := routingTable[pkt.SrcIP].Load()
-		if route == nil || !route.RemoteAddr.IsValid() {
-			continue
-		}
-
-		_sendControlPacket(addrDiscoveryPacket{
-			TraceID: p.TraceID,
-			ToAddr:  pkt.SrcAddr,
-		}, *route, buf1, buf2)
-	}
-}
-
-func addrDiscoveryClient() {
-	var (
-		checkInterval = 8 * time.Second
-		timer         = time.NewTimer(4 * time.Second)
-
-		buf1 = make([]byte, bufferSize)
-		buf2 = make([]byte, bufferSize)
-
-		addrPacket addrDiscoveryPacket
-		lAddr      netip.AddrPort
-	)
-
-	for {
-		select {
-		case pkt := <-discoveryPackets:
-			p, ok := pkt.Payload.(addrDiscoveryPacket)
-			if !ok || p.TraceID != addrPacket.TraceID || !p.ToAddr.IsValid() || p.ToAddr == lAddr {
-				continue
-			}
-
-			log.Printf("Discovered local address: %v", p.ToAddr)
-			lAddr = p.ToAddr
-			localAddr.Store(&p.ToAddr)
-
-		case <-timer.C:
-			timer.Reset(checkInterval)
-
-			route := getRelayRoute()
-			if route == nil {
-				continue
-			}
-
-			addrPacket.TraceID = newTraceID()
-			_sendControlPacket(addrPacket, *route, buf1, buf2)
-		}
-	}
-}

node/bitset.go

@@ -1,21 +0,0 @@
-package node
-
-const bitSetSize = 512 // Multiple of 64.
-
-type bitSet [bitSetSize / 64]uint64
-
-func (bs *bitSet) Set(i int) {
-	bs[i/64] |= 1 << (i % 64)
-}
-
-func (bs *bitSet) Clear(i int) {
-	bs[i/64] &= ^(1 << (i % 64))
-}
-
-func (bs *bitSet) ClearAll() {
-	clear(bs[:])
-}
-
-func (bs *bitSet) Get(i int) bool {
-	return bs[i/64]&(1<<(i%64)) != 0
-}

node/bitset_test.go

@@ -1,48 +0,0 @@
-package node
-
-import (
-	"math/rand"
-	"testing"
-)
-
-func TestBitSet(t *testing.T) {
-	state := make([]bool, bitSetSize)
-	for i := range state {
-		state[i] = rand.Float32() > 0.5
-	}
-
-	bs := bitSet{}
-
-	for i := range state {
-		if state[i] {
-			bs.Set(i)
-		}
-	}
-
-	for i := range state {
-		if bs.Get(i) != state[i] {
-			t.Fatal(i, state[i], bs.Get(i))
-		}
-	}
-
-	for i := range state {
-		if rand.Float32() > 0.5 {
-			state[i] = false
-			bs.Clear(i)
-		}
-	}
-
-	for i := range state {
-		if bs.Get(i) != state[i] {
-			t.Fatal(i, state[i], bs.Get(i))
-		}
-	}
-
-	bs.ClearAll()
-
-	for i := range state {
-		if bs.Get(i) {
-			t.Fatal(i, bs.Get(i))
-		}
-	}
-}

node/cipher-control.go

@@ -1,26 +0,0 @@
-package node
-
-import "golang.org/x/crypto/nacl/box"
-
-type controlCipher struct {
-	sharedKey [32]byte
-}
-
-func newControlCipher(privKey, pubKey []byte) *controlCipher {
-	shared := [32]byte{}
-	box.Precompute(&shared, (*[32]byte)(pubKey), (*[32]byte)(privKey))
-	return &controlCipher{shared}
-}
-
-func (cc *controlCipher) Encrypt(h header, data, out []byte) []byte {
-	const s = controlHeaderSize
-	out = out[:s+controlCipherOverhead+len(data)]
-	h.Marshal(out[:s])
-	box.SealAfterPrecomputation(out[s:s], data, (*[24]byte)(out[:s]), &cc.sharedKey)
-	return out
-}
-
-func (cc *controlCipher) Decrypt(encrypted, out []byte) (data []byte, ok bool) {
-	const s = controlHeaderSize
-	return box.OpenAfterPrecomputation(out[:0], encrypted[s:], (*[24]byte)(encrypted[:s]), &cc.sharedKey)
-}

node/cipher-control_test.go

@@ -1,122 +0,0 @@
-package node
-
-import (
-	"bytes"
-	"crypto/rand"
-	"reflect"
-	"testing"
-
-	"golang.org/x/crypto/nacl/box"
-)
-
-func newControlCipherForTesting() (c1, c2 *controlCipher) {
-	pubKey1, privKey1, err := box.GenerateKey(rand.Reader)
-	if err != nil {
-		panic(err)
-	}
-
-	pubKey2, privKey2, err := box.GenerateKey(rand.Reader)
-	if err != nil {
-		panic(err)
-	}
-
-	return newControlCipher(privKey1[:], pubKey2[:]),
-		newControlCipher(privKey2[:], pubKey1[:])
-}
-
-func TestControlCipher(t *testing.T) {
-	c1, c2 := newControlCipherForTesting()
-
-	maxSizePlaintext := make([]byte, bufferSize-controlHeaderSize-controlCipherOverhead)
-	rand.Read(maxSizePlaintext)
-
-	testCases := [][]byte{
-		make([]byte, 0),
-		{1},
-		{255},
-		{1, 2, 3, 4, 5},
-		[]byte("Hello world"),
-		maxSizePlaintext,
-	}
-
-	for _, plaintext := range testCases {
-		h1 := header{
-			StreamID: controlStreamID,
-			Counter:  235153,
-			SourceIP: 4,
-			DestIP:   88,
-		}
-
-		encrypted := make([]byte, bufferSize)
-
-		encrypted = c1.Encrypt(h1, plaintext, encrypted)
-
-		h2 := header{}
-		h2.Parse(encrypted)
-		if !reflect.DeepEqual(h1, h2) {
-			t.Fatal(h1, h2)
-		}
-
-		decrypted, ok := c2.Decrypt(encrypted, make([]byte, bufferSize))
-		if !ok {
-			t.Fatal(ok)
-		}
-
-		if !bytes.Equal(decrypted, plaintext) {
-			t.Fatal("not equal")
-		}
-	}
-}
-
-func TestControlCipher_ShortCiphertext(t *testing.T) {
-	c1, _ := newControlCipherForTesting()
-	shortText := make([]byte, controlHeaderSize+controlCipherOverhead-1)
-	rand.Read(shortText)
-	_, ok := c1.Decrypt(shortText, make([]byte, bufferSize))
-	if ok {
-		t.Fatal(ok)
-	}
-}
-
-func BenchmarkControlCipher_Encrypt(b *testing.B) {
-	c1, _ := newControlCipherForTesting()
-	h1 := header{
-		Counter:  235153,
-		SourceIP: 4,
-		DestIP:   88,
-	}
-
-	plaintext := make([]byte, bufferSize-controlHeaderSize-controlCipherOverhead)
-	rand.Read(plaintext)
-
-	encrypted := make([]byte, bufferSize)
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		encrypted = c1.Encrypt(h1, plaintext, encrypted)
-	}
-}
-
-func BenchmarkControlCipher_Decrypt(b *testing.B) {
-	c1, c2 := newControlCipherForTesting()
-
-	h1 := header{
-		Counter:  235153,
-		SourceIP: 4,
-		DestIP:   88,
-	}
-
-	plaintext := make([]byte, bufferSize-controlHeaderSize-controlCipherOverhead)
-	rand.Read(plaintext)
-
-	encrypted := make([]byte, bufferSize)
-
-	encrypted = c1.Encrypt(h1, plaintext, encrypted)
-
-	decrypted := make([]byte, bufferSize)
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		decrypted, _ = c2.Decrypt(encrypted, decrypted)
-	}
-}

node/cipher-data.go

@@ -1,62 +0,0 @@
-package node
-
-import (
-	"crypto/aes"
-	"crypto/cipher"
-	"crypto/rand"
-)
-
-// TODO: Use [32]byte for simplicity everywhere.
-type dataCipher struct {
-	key  [32]byte
-	aead cipher.AEAD
-}
-
-func newDataCipher() *dataCipher {
-	key := [32]byte{}
-	if _, err := rand.Read(key[:]); err != nil {
-		panic(err)
-	}
-	return newDataCipherFromKey(key)
-}
-
-// key must be 32 bytes.
-func newDataCipherFromKey(key [32]byte) *dataCipher {
-	block, err := aes.NewCipher(key[:])
-	if err != nil {
-		panic(err)
-	}
-
-	aead, err := cipher.NewGCM(block)
-	if err != nil {
-		panic(err)
-	}
-
-	return &dataCipher{key: key, aead: aead}
-}
-
-func (sc *dataCipher) Key() [32]byte {
-	return sc.key
-}
-
-func (sc *dataCipher) Encrypt(h header, data, out []byte) []byte {
-	const s = dataHeaderSize
-	out = out[:s+dataCipherOverhead+len(data)]
-	h.Marshal(out[:s])
-	sc.aead.Seal(out[s:s], out[:s], data, nil)
-	return out
-}
-
-func (sc *dataCipher) Decrypt(encrypted, out []byte) (data []byte, ok bool) {
-	const s = dataHeaderSize
-	if len(encrypted) < s+dataCipherOverhead {
-		ok = false
-		return
-	}
-
-	var err error
-
-	data, err = sc.aead.Open(out[:0], encrypted[:s], encrypted[s:], nil)
-	ok = err == nil
-	return
-}

node/cipher-data_test.go

@@ -1,141 +0,0 @@
-package node
-
-import (
-	"bytes"
-	"crypto/rand"
-	mrand "math/rand/v2"
-	"reflect"
-	"testing"
-)
-
-func TestDataCipher(t *testing.T) {
-	maxSizePlaintext := make([]byte, bufferSize-dataHeaderSize-dataCipherOverhead)
-	rand.Read(maxSizePlaintext)
-
-	testCases := [][]byte{
-		make([]byte, 0),
-		{1},
-		{255},
-		{1, 2, 3, 4, 5},
-		[]byte("Hello world"),
-		maxSizePlaintext,
-	}
-
-	for _, plaintext := range testCases {
-		h1 := header{
-			StreamID: dataStreamID,
-			Counter:  235153,
-			SourceIP: 4,
-			DestIP:   88,
-		}
-
-		encrypted := make([]byte, bufferSize)
-
-		dc1 := newDataCipher()
-		encrypted = dc1.Encrypt(h1, plaintext, encrypted)
-		h2 := header{}
-		h2.Parse(encrypted)
-
-		dc2 := newDataCipherFromKey(dc1.Key())
-
-		decrypted, ok := dc2.Decrypt(encrypted, make([]byte, bufferSize-dataHeaderSize))
-		if !ok {
-			t.Fatal(ok)
-		}
-
-		if !bytes.Equal(plaintext, decrypted) {
-			t.Fatal("not equal")
-		}
-
-		if !reflect.DeepEqual(h1, h2) {
-			t.Fatalf("%v != %v", h1, h2)
-		}
-	}
-}
-
-func TestDataCipher_ModifyCiphertext(t *testing.T) {
-	maxSizePlaintext := make([]byte, bufferSize-dataHeaderSize-dataCipherOverhead)
-	rand.Read(maxSizePlaintext)
-
-	testCases := [][]byte{
-		make([]byte, 0),
-		{1},
-		{255},
-		{1, 2, 3, 4, 5},
-		[]byte("Hello world"),
-		maxSizePlaintext,
-	}
-
-	for _, plaintext := range testCases {
-		h1 := header{
-			Counter:  235153,
-			SourceIP: 4,
-			DestIP:   88,
-		}
-
-		encrypted := make([]byte, bufferSize)
-
-		dc1 := newDataCipher()
-		encrypted = dc1.Encrypt(h1, plaintext, encrypted)
-		encrypted[mrand.IntN(len(encrypted))]++
-
-		dc2 := newDataCipherFromKey(dc1.Key())
-
-		_, ok := dc2.Decrypt(encrypted, make([]byte, bufferSize-dataHeaderSize))
-		if ok {
-			t.Fatal(ok)
-		}
-	}
-}
-
-func TestDataCipher_ShortCiphertext(t *testing.T) {
-	dc1 := newDataCipher()
-	shortText := make([]byte, dataHeaderSize+dataCipherOverhead-1)
-	rand.Read(shortText)
-	_, ok := dc1.Decrypt(shortText, make([]byte, bufferSize))
-	if ok {
-		t.Fatal(ok)
-	}
-}
-
-func BenchmarkDataCipher_Encrypt(b *testing.B) {
-	h1 := header{
-		Counter:  235153,
-		SourceIP: 4,
-		DestIP:   88,
-	}
-
-	plaintext := make([]byte, bufferSize-dataHeaderSize-dataCipherOverhead)
-	rand.Read(plaintext)
-
-	encrypted := make([]byte, bufferSize)
-
-	dc1 := newDataCipher()
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		encrypted = dc1.Encrypt(h1, plaintext, encrypted)
-	}
-}
-
-func BenchmarkDataCipher_Decrypt(b *testing.B) {
-	h1 := header{
-		Counter:  235153,
-		SourceIP: 4,
-		DestIP:   88,
-	}
-
-	plaintext := make([]byte, bufferSize-dataHeaderSize-dataCipherOverhead)
-	rand.Read(plaintext)
-
-	encrypted := make([]byte, bufferSize)
-
-	dc1 := newDataCipher()
-	encrypted = dc1.Encrypt(h1, plaintext, encrypted)
-
-	decrypted := make([]byte, bufferSize)
-
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		decrypted, _ = dc1.Decrypt(encrypted, decrypted)
-	}
-}

node/cmd/client/build.sh

@@ -1,5 +0,0 @@
-#!/bin/bash
-
-go build
-sudo setcap cap_net_admin+iep ./client
-./client 144.76.78.93

node/cmd/client/main.go

@@ -1,15 +0,0 @@
-package main
-
-import (
-	"log"
-	"os"
-	"vppn/node"
-)
-
-func main() {
-	if len(os.Args) != 2 {
-		log.Fatalf("Usage: %s <addr:port>", os.Args[0])
-	}
-	n := node.NewTmpNodeClient(os.Args[1])
-	n.RunClient()
-}

node/cmd/server/build.sh

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-go build
-ssh kevin "killall server"
-scp server kevin:/home/jdl/tmp/
-ssh root@kevin "sudo setcap cap_net_admin+iep /home/jdl/tmp/server"
-ssh kevin "/home/jdl/tmp/server"

node/cmd/server/main.go

@@ -1,8 +0,0 @@
-package main
-
-import "vppn/node"
-
-func main() {
-	n := node.NewTmpNodeServer()
-	n.RunServer()
-}

node/conn.go

@@ -1,49 +0,0 @@
-package node
-
-import (
-	"io"
-	"log"
-	"net"
-	"net/netip"
-	"runtime/debug"
-	"sync"
-)
-
-// ----------------------------------------------------------------------------
-
-type connWriter struct {
-	lock sync.Mutex
-	conn *net.UDPConn
-}
-
-func newConnWriter(conn *net.UDPConn) *connWriter {
-	return &connWriter{conn: conn}
-}
-
-func (w *connWriter) WriteTo(packet []byte, addr netip.AddrPort) {
-	w.lock.Lock()
-	if _, err := w.conn.WriteToUDPAddrPort(packet, addr); err != nil {
-		debug.PrintStack()
-		log.Fatalf("Failed to write to UDP port: %v", err)
-	}
-	w.lock.Unlock()
-}
-
-// ----------------------------------------------------------------------------
-
-type ifWriter struct {
-	lock  sync.Mutex
-	iface io.ReadWriteCloser
-}
-
-func newIFWriter(iface io.ReadWriteCloser) *ifWriter {
-	return &ifWriter{iface: iface}
-}
-
-func (w *ifWriter) Write(packet []byte) {
-	w.lock.Lock()
-	if _, err := w.iface.Write(packet); err != nil {
-		log.Fatalf("Failed to write to interface: %v", err)
-	}
-	w.lock.Unlock()
-}

node/dupcheck.go

@@ -1,76 +0,0 @@
-package node
-
-type dupCheck struct {
-	bitSet
-	head        int
-	tail        int
-	headCounter uint64
-	tailCounter uint64 // Also next expected counter value.
-}
-
-func newDupCheck(headCounter uint64) *dupCheck {
-	return &dupCheck{
-		headCounter: headCounter,
-		tailCounter: headCounter + 1,
-		tail:        1,
-	}
-}
-
-func (dc *dupCheck) IsDup(counter uint64) bool {
-
-	// Before head => it's late, say it's a dup.
-	if counter < dc.headCounter {
-		return true
-	}
-
-	// It's within the counter bounds.
-	if counter < dc.tailCounter {
-		index := (int(counter-dc.headCounter) + dc.head) % bitSetSize
-		if dc.Get(index) {
-			return true
-		}
-
-		dc.Set(index)
-		return false
-	}
-
-	// It's more than 1 beyond the tail.
-	delta := counter - dc.tailCounter
-
-	// Full clear.
-	if delta >= bitSetSize {
-		dc.ClearAll()
-		dc.Set(0)
-
-		dc.tail = 1
-		dc.head = 2
-		dc.tailCounter = counter + 1
-		dc.headCounter = dc.tailCounter - bitSetSize
-
-		return false
-	}
-
-	// Clear if necessary.
-	for i := 0; i < int(delta); i++ {
-		dc.put(false)
-	}
-
-	dc.put(true)
-	return false
-}
-
-func (dc *dupCheck) put(set bool) {
-	if set {
-		dc.Set(dc.tail)
-	} else {
-		dc.Clear(dc.tail)
-	}
-
-	dc.tail = (dc.tail + 1) % bitSetSize
-	dc.tailCounter++
-
-	if dc.head == dc.tail {
-		dc.head = (dc.head + 1) % bitSetSize
-		dc.headCounter++
-	}
-}

node/dupcheck_test.go

@@ -1,54 +0,0 @@
-package node
-
-import (
-	"testing"
-)
-
-func TestDupCheck(t *testing.T) {
-	dc := newDupCheck(0)
-
-	for i := range bitSetSize {
-		if dc.IsDup(uint64(i)) {
-			t.Fatal("!")
-		}
-	}
-
-	type TestCase struct {
-		Counter uint64
-		Dup     bool
-	}
-
-	testCases := []TestCase{
-		{0, true},
-		{1, true},
-		{2, true},
-		{3, true},
-		{63, true},
-		{256, true},
-		{510, true},
-		{511, true},
-		{512, false},
-		{0, true},
-		{512, true},
-		{513, false},
-		{517, false},
-		{512, true},
-		{513, true},
-		{514, false},
-		{515, false},
-		{516, false},
-		{517, true},
-		{2512, false},
-		{2000, true},
-		{2001, false},
-		{4000, false},
-		{4000 - 512, true},  // Too old.
-		{4000 - 511, false}, // Just in the window.
-	}
-
-	for i, tc := range testCases {
-		if ok := dc.IsDup(tc.Counter); ok != tc.Dup {
-			t.Fatal(i, ok, tc)
-		}
-	}
-}

node/globalfuncs.go

@@ -1,73 +0,0 @@
-package node
-
-import (
-	"net/netip"
-	"sync/atomic"
-)
-
-func getRelayRoute() *peerRoute {
-	if ip := relayIP.Load(); ip != nil {
-		return routingTable[*ip].Load()
-	}
-	return nil
-}
-
-func getLocalAddr() netip.AddrPort {
-	if a := localAddr.Load(); a != nil {
-		return *a
-	}
-	return netip.AddrPort{}
-}
-
-func _sendControlPacket(pkt interface{ Marshal([]byte) []byte }, route peerRoute, buf1, buf2 []byte) {
-	buf := pkt.Marshal(buf2)
-	h := header{
-		StreamID: controlStreamID,
-		Counter:  atomic.AddUint64(&sendCounters[route.IP], 1),
-		SourceIP: localIP,
-		DestIP:   route.IP,
-	}
-	buf = route.ControlCipher.Encrypt(h, buf, buf1)
-
-	if route.Direct {
-		_conn.WriteTo(buf, route.RemoteAddr)
-		return
-	}
-
-	_relayPacket(route.IP, buf, buf2)
-}
-
-func _sendDataPacket(route *peerRoute, pkt, buf1, buf2 []byte) {
-	h := header{
-		StreamID: dataStreamID,
-		Counter:  atomic.AddUint64(&sendCounters[route.IP], 1),
-		SourceIP: localIP,
-		DestIP:   route.IP,
-	}
-
-	enc := route.DataCipher.Encrypt(h, pkt, buf1)
-
-	if route.Direct {
-		_conn.WriteTo(enc, route.RemoteAddr)
-		return
-	}
-
-	_relayPacket(route.IP, enc, buf2)
-}
-
-func _relayPacket(destIP byte, data, buf []byte) {
-	relayRoute := getRelayRoute()
-	if relayRoute == nil || !relayRoute.Up || !relayRoute.Relay {
-		return
-	}
-
-	h := header{
-		StreamID: dataStreamID,
-		Counter:  atomic.AddUint64(&sendCounters[relayRoute.IP], 1),
-		SourceIP: localIP,
-		DestIP:   destIP,
-	}
-
-	enc := relayRoute.DataCipher.Encrypt(h, data, buf)
-	_conn.WriteTo(enc, relayRoute.RemoteAddr)
-}

node/globals.go

@@ -1,86 +0,0 @@
-package node
-
-import (
-	"net/netip"
-	"sync/atomic"
-	"time"
-	"vppn/m"
-)
-
-const (
-	bufferSize            = 1536
-	if_mtu                = 1200
-	if_queue_len          = 2048
-	controlCipherOverhead = 16
-	dataCipherOverhead    = 16
-)
-
-type peerRoute struct {
-	IP            byte
-	Up            bool // True if data can be sent on the route.
-	Relay         bool // True if the peer is a relay.
-	Direct        bool // True if this is a direct connection.
-	ControlCipher *controlCipher
-	DataCipher    *dataCipher
-	RemoteAddr    netip.AddrPort // Remote address if directly connected.
-}
-
-var (
-	// Configuration for this peer.
-	netName    string
-	localIP    byte
-	localPub   bool
-	privateKey []byte
-
-	// Shared interface for writing.
-	_iface *ifWriter
-
-	// Shared connection for writing.
-	_conn *connWriter
-
-	// Counters for sending to each peer.
-	sendCounters [256]uint64 = func() (out [256]uint64) {
-		for i := range out {
-			out[i] = uint64(time.Now().Unix()<<30 + 1)
-		}
-		return
-	}()
-
-	// Duplicate checkers for incoming packets.
-	dupChecks [256]*dupCheck = func() (out [256]*dupCheck) {
-		for i := range out {
-			out[i] = newDupCheck(0)
-		}
-		return
-	}()
-
-	// Channels for incoming control packets.
-	controlPackets [256]chan controlPacket = func() (out [256]chan controlPacket) {
-		for i := range out {
-			out[i] = make(chan controlPacket, 256)
-		}
-		return
-	}()
-
-	// Channels for incoming peer updates from the hub.
-	peerUpdates [256]chan *m.Peer = func() (out [256]chan *m.Peer) {
-		for i := range out {
-			out[i] = make(chan *m.Peer)
-		}
-		return
-	}()
-
-	// Global routing table.
-	routingTable [256]*atomic.Pointer[peerRoute] = func() (out [256]*atomic.Pointer[peerRoute]) {
-		for i := range out {
-			out[i] = &atomic.Pointer[peerRoute]{}
-			out[i].Store(&peerRoute{})
-		}
-		return
-	}()
-
-	// Managed by the relayManager.
-	discoveryPackets chan controlPacket
-	localAddr        *atomic.Pointer[netip.AddrPort] // May be nil.
-	relayIP          *atomic.Pointer[byte]           // May be nil.
-)

node/header.go

@@ -1,35 +0,0 @@
-package node
-
-import "unsafe"
-
-// ----------------------------------------------------------------------------
-
-const (
-	headerSize        = 12
-	controlStreamID   = 2
-	controlHeaderSize = 24
-	dataStreamID      = 1
-	dataHeaderSize    = 12
-)
-
-type header struct {
-	StreamID byte
-	Counter  uint64 // Init with time.Now().Unix << 30 to ensure monotonic.
-	SourceIP byte
-	DestIP   byte
-}
-
-func (h *header) Parse(b []byte) {
-	h.StreamID = b[0]
-	h.Counter = *(*uint64)(unsafe.Pointer(&b[1]))
-	h.SourceIP = b[9]
-	h.DestIP = b[10]
-}
-
-func (h *header) Marshal(buf []byte) {
-	buf[0] = h.StreamID
-	*(*uint64)(unsafe.Pointer(&buf[1])) = h.Counter
-	buf[9] = h.SourceIP
-	buf[10] = h.DestIP
-	buf[11] = 0
-}

node/header_test.go

@@ -1,21 +0,0 @@
-package node
-
-import "testing"
-
-func TestHeaderMarshalParse(t *testing.T) {
-	nIn := header{
-		StreamID: 23,
-		Counter:  3212,
-		SourceIP: 34,
-		DestIP:   200,
-	}
-
-	buf := make([]byte, headerSize)
-	nIn.Marshal(buf)
-
-	nOut := header{}
-	nOut.Parse(buf)
-	if nIn != nOut {
-		t.Fatal(nIn, nOut)
-	}
-}

node/hubpoller.go

@@ -1,94 +0,0 @@
-package node
-
-import (
-	"encoding/json"
-	"io"
-	"log"
-	"net/http"
-	"net/url"
-	"time"
-	"vppn/m"
-)
-
-type hubPoller struct {
-	client   *http.Client
-	req      *http.Request
-	versions [256]int64
-}
-
-func newHubPoller(conf m.PeerConfig) *hubPoller {
-	u, err := url.Parse(conf.HubAddress)
-	if err != nil {
-		log.Fatalf("Failed to parse hub address %s: %v", conf.HubAddress, err)
-	}
-	u.Path = "/peer/fetch-state/"
-
-	client := &http.Client{Timeout: 8 * time.Second}
-
-	req := &http.Request{
-		Method: http.MethodGet,
-		URL:    u,
-		Header: http.Header{},
-	}
-	req.SetBasicAuth("", conf.APIKey)
-
-	return &hubPoller{
-		client: client,
-		req:    req,
-	}
-}
-
-func (hp *hubPoller) Run() {
-	defer panicHandler()
-
-	state, err := loadNetworkState(netName)
-	if err != nil {
-		log.Printf("Failed to load network state: %v", err)
-		log.Printf("Polling hub...")
-		hp.pollHub()
-	} else {
-		hp.applyNetworkState(state)
-	}
-
-	for range time.Tick(64 * time.Second) {
-		hp.pollHub()
-	}
-}
-
-func (hp *hubPoller) pollHub() {
-	var state m.NetworkState
-
-	resp, err := hp.client.Do(hp.req)
-	if err != nil {
-		log.Printf("Failed to fetch peer state: %v", err)
-		return
-	}
-	body, err := io.ReadAll(resp.Body)
-	_ = resp.Body.Close()
-	if err != nil {
-		log.Printf("Failed to read body from hub: %v", err)
-		return
-	}
-
-	if err := json.Unmarshal(body, &state); err != nil {
-		log.Printf("Failed to unmarshal response from hub: %v", err)
-		return
-	}
-
-	hp.applyNetworkState(state)
-
-	if err := storeNetworkState(netName, state); err != nil {
-		log.Printf("Failed to store network state: %v", err)
-	}
-}
-
-func (hp *hubPoller) applyNetworkState(state m.NetworkState) {
-	for i, peer := range state.Peers {
-		if i != int(localIP) {
-			if peer != nil && peer.Version != hp.versions[i] {
-				peerUpdates[i] <- state.Peers[i]
-				hp.versions[i] = peer.Version
-			}
-		}
-	}
-}

node/interface.go

@@ -1,177 +0,0 @@
-package node
-
-import (
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"os"
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-// Get next packet, returning packet, ip, and possible error.
-func readNextPacket(iface io.ReadWriteCloser, buf []byte) ([]byte, byte, error) {
-	var (
-		version byte
-		ip      byte
-	)
-	for {
-		n, err := iface.Read(buf[:cap(buf)])
-		if err != nil {
-			return nil, ip, err
-		}
-
-		buf = buf[:n]
-		version = buf[0] >> 4
-
-		switch version {
-		case 4:
-			if n < 20 {
-				log.Printf("Short IPv4 packet: %d", len(buf))
-				continue
-			}
-			ip = buf[19]
-
-		case 6:
-			if len(buf) < 40 {
-				log.Printf("Short IPv6 packet: %d", len(buf))
-				continue
-			}
-			ip = buf[39]
-
-		default:
-			log.Printf("Invalid IP packet version: %v", version)
-			continue
-		}
-
-		return buf, ip, nil
-	}
-}
-
-func openInterface(network []byte, localIP byte, name string) (io.ReadWriteCloser, error) {
-	if len(network) != 4 {
-		return nil, fmt.Errorf("expected network to be 4 bytes, got %d", len(network))
-	}
-	ip := net.IPv4(network[0], network[1], network[2], localIP)
-
-	//////////////////////////
-	// Create TUN Interface //
-	//////////////////////////
-
-	tunFD, err := syscall.Open("/dev/net/tun", syscall.O_RDWR|unix.O_CLOEXEC, 0600)
-	if err != nil {
-		return nil, fmt.Errorf("failed to open TUN device: %w", err)
-	}
-
-	// New interface request.
-	req, err := unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create new TUN interface request: %w", err)
-	}
-
-	// Flags:
-	//
-	// IFF_NO_PI => don't add packet info data to packets sent to the interface.
-	// IFF_TUN   => create a TUN device handling IP packets.
-	req.SetUint16(unix.IFF_NO_PI | unix.IFF_TUN)
-
-	err = unix.IoctlIfreq(tunFD, unix.TUNSETIFF, req)
-	if err != nil {
-		return nil, fmt.Errorf("failed to set TUN device settings: %w", err)
-	}
-
-	// Name may not be exactly the same?
-	name = req.Name()
-
-	/////////////
-	// Set MTU //
-	/////////////
-
-	// We need a socket file descriptor to set other options for some reason.
-	sockFD, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_IP)
-	if err != nil {
-		return nil, fmt.Errorf("failed to open socket: %w", err)
-	}
-	defer unix.Close(sockFD)
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create MTU interface request: %w", err)
-	}
-
-	req.SetUint32(if_mtu)
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFMTU, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface MTU: %w", err)
-	}
-
-	//////////////////////
-	// Set Queue Length //
-	//////////////////////
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create IP interface request: %w", err)
-	}
-
-	req.SetUint16(if_queue_len)
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFTXQLEN, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface queue length: %w", err)
-	}
-
-	/////////////////////
-	// Set IP and Mask //
-	/////////////////////
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create IP interface request: %w", err)
-	}
-
-	if err := req.SetInet4Addr(ip.To4()); err != nil {
-		return nil, fmt.Errorf("failed to set interface request IP: %w", err)
-	}
-
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFADDR, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface IP: %w", err)
-	}
-
-	// SET MASK - must happen after setting address.
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create mask interface request: %w", err)
-	}
-
-	if err := req.SetInet4Addr(net.IPv4(255, 255, 255, 0).To4()); err != nil {
-		return nil, fmt.Errorf("failed to set interface request mask: %w", err)
-	}
-
-	if err := unix.IoctlIfreq(sockFD, unix.SIOCSIFNETMASK, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface mask: %w", err)
-	}
-
-	////////////////////////
-	// Bring Interface Up //
-	////////////////////////
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create up interface request: %w", err)
-	}
-
-	// Get current flags.
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCGIFFLAGS, req); err != nil {
-		return nil, fmt.Errorf("failed to get interface flags: %w", err)
-	}
-
-	flags := req.Uint16() | unix.IFF_UP | unix.IFF_RUNNING
-
-	// Set UP flag / broadcast flags.
-	req.SetUint16(flags)
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFFLAGS, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface up: %w", err)
-	}
-
-	return os.NewFile(uintptr(tunFD), "tun"), nil
-}

node/main.go

@@ -1,309 +0,0 @@
-package node
-
-import (
-	"encoding/json"
-	"flag"
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"net/http"
-	"net/netip"
-	"os"
-	"runtime/debug"
-	"sync/atomic"
-	"vppn/m"
-)
-
-func panicHandler() {
-	if r := recover(); r != nil {
-		log.Fatalf("\n %v\n\nstacktrace from panic: %s\n", r, string(debug.Stack()))
-	}
-}
-
-func Main() {
-	defer panicHandler()
-
-	var (
-		initURL  string
-		listenIP string
-		port     int
-	)
-
-	flag.StringVar(&netName, "name", "", "[REQUIRED] The network name.")
-	flag.StringVar(&initURL, "init-url", "", "Initializes peer from the hub URL.")
-	flag.StringVar(&listenIP, "listen-ip", "", "IP address to listen on.")
-	flag.IntVar(&port, "port", 0, "Port to listen on.")
-	flag.Parse()
-
-	if netName == "" {
-		flag.Usage()
-		os.Exit(1)
-	}
-
-	if initURL != "" {
-		mainInit(initURL)
-		return
-	}
-
-	main(listenIP, uint16(port))
-}
-
-func mainInit(initURL string) {
-	if _, err := loadPeerConfig(netName); err == nil {
-		log.Fatalf("Network is already initialized.")
-	}
-
-	resp, err := http.Get(initURL)
-	if err != nil {
-		log.Fatalf("Failed to fetch data from hub: %v", err)
-	}
-	defer resp.Body.Close()
-
-	data, err := io.ReadAll(resp.Body)
-	if err != nil {
-		log.Fatalf("Failed to read response body: %v", err)
-	}
-
-	peerConfig := m.PeerConfig{}
-	if err := json.Unmarshal(data, &peerConfig); err != nil {
-		log.Fatalf("Failed to parse configuration: %v", err)
-	}
-
-	if err := storePeerConfig(netName, peerConfig); err != nil {
-		log.Fatalf("Failed to store configuration: %v", err)
-	}
-
-	log.Print("Initialization successful.")
-}
-
-// ----------------------------------------------------------------------------
-
-func main(listenIP string, port uint16) {
-	config, err := loadPeerConfig(netName)
-	if err != nil {
-		log.Fatalf("Failed to load configuration: %v", err)
-	}
-
-	port = determinePort(config.Port, port)
-
-	iface, err := openInterface(config.Network, config.PeerIP, netName)
-	if err != nil {
-		log.Fatalf("Failed to open interface: %v", err)
-	}
-
-	myAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", listenIP, port))
-	if err != nil {
-		log.Fatalf("Failed to resolve UDP address: %v", err)
-	}
-
-	conn, err := net.ListenUDP("udp", myAddr)
-	if err != nil {
-		log.Fatalf("Failed to open UDP port: %v", err)
-	}
-
-	// Intialize globals.
-	_iface = newIFWriter(iface)
-	_conn = newConnWriter(conn)
-
-	localIP = config.PeerIP
-	discoveryPackets = make(chan controlPacket, 256)
-	localAddr = &atomic.Pointer[netip.AddrPort]{}
-	relayIP = &atomic.Pointer[byte]{}
-
-	ip, ok := netip.AddrFromSlice(config.PublicIP)
-	if ok {
-		localPub = true
-		addr := netip.AddrPortFrom(ip, config.Port)
-		localAddr.Store(&addr)
-	}
-
-	privateKey = config.PrivKey
-
-	// Start supervisors.
-	for i := range 256 {
-		go newPeerSupervisor(i).Run()
-	}
-
-	if localPub {
-		go addrDiscoveryServer()
-	} else {
-		go addrDiscoveryClient()
-		go relayManager()
-	}
-	go newHubPoller(config).Run()
-	go readFromConn(conn)
-	readFromIFace(iface)
-}
-
-// ----------------------------------------------------------------------------
-
-func determinePort(confPort, portFromCommandLine uint16) uint16 {
-	if portFromCommandLine != 0 {
-		return portFromCommandLine
-	}
-	if confPort != 0 {
-		return confPort
-	}
-	return 456
-}
-
-// ----------------------------------------------------------------------------
-
-func readFromConn(conn *net.UDPConn) {
-
-	defer panicHandler()
-
-	var (
-		remoteAddr netip.AddrPort
-		n          int
-		err        error
-		buf        = make([]byte, bufferSize)
-		decBuf     = make([]byte, bufferSize)
-		data       []byte
-		h          header
-	)
-
-	for {
-		n, remoteAddr, err = conn.ReadFromUDPAddrPort(buf[:bufferSize])
-		if err != nil {
-			log.Fatalf("Failed to read from UDP port: %v", err)
-		}
-
-		remoteAddr = netip.AddrPortFrom(remoteAddr.Addr().Unmap(), remoteAddr.Port())
-
-		data = buf[:n]
-
-		if n < headerSize {
-			continue // Packet it soo short.
-		}
-
-		h.Parse(data)
-		switch h.StreamID {
-		case controlStreamID:
-			handleControlPacket(remoteAddr, h, data, decBuf)
-
-		case dataStreamID:
-			handleDataPacket(h, data, decBuf)
-
-		default:
-			log.Printf("Unknown stream ID: %d", h.StreamID)
-		}
-	}
-}
-
-func handleControlPacket(addr netip.AddrPort, h header, data, decBuf []byte) {
-	route := routingTable[h.SourceIP].Load()
-	if route.ControlCipher == nil {
-		//log.Printf("Not connected (control).")
-		return
-	}
-
-	if h.DestIP != localIP {
-		log.Printf("Incorrect destination IP on control packet: %d != %d", h.DestIP, localIP)
-		return
-	}
-
-	out, ok := route.ControlCipher.Decrypt(data, decBuf)
-	if !ok {
-		//log.Printf("Failed to decrypt control packet.")
-		return
-	}
-
-	if len(out) == 0 {
-		//log.Printf("Empty control packet from: %d", h.SourceIP)
-		return
-	}
-
-	if dupChecks[h.SourceIP].IsDup(h.Counter) {
-		//log.Printf("[%03d] Duplicate control packet: %d", h.SourceIP, h.Counter)
-		return
-	}
-
-	pkt := controlPacket{
-		SrcIP:   h.SourceIP,
-		SrcAddr: addr,
-	}
-
-	if err := pkt.ParsePayload(out); err != nil {
-		log.Printf("Failed to parse control packet: %v", err)
-		return
-	}
-
-	switch pkt.Payload.(type) {
-
-	case addrDiscoveryPacket:
-		select {
-		case discoveryPackets <- pkt:
-		default:
-			log.Printf("Dropping discovery packet.")
-		}
-
-	default:
-		select {
-		case controlPackets[h.SourceIP] <- pkt:
-		default:
-			log.Printf("Dropping control packet.")
-		}
-	}
-
-}
-
-func handleDataPacket(h header, data []byte, decBuf []byte) {
-	route := routingTable[h.SourceIP].Load()
-	if !route.Up {
-		//log.Printf("Not connected (recv).")
-		return
-	}
-
-	dec, ok := route.DataCipher.Decrypt(data, decBuf)
-	if !ok {
-		log.Printf("Failed to decrypt data packet.")
-		return
-	}
-
-	if dupChecks[h.SourceIP].IsDup(h.Counter) {
-		//log.Printf("[%03d] Duplicate data packet: %d", h.SourceIP, h.Counter)
-		return
-	}
-
-	if h.DestIP == localIP {
-		_iface.Write(dec)
-		return
-	}
-
-	destRoute := routingTable[h.DestIP].Load()
-	if !destRoute.Up {
-		log.Printf("Not connected (relay): %v", destRoute)
-		return
-	}
-
-	_conn.WriteTo(dec, destRoute.RemoteAddr)
-}
-
-// ----------------------------------------------------------------------------
-
-func readFromIFace(iface io.ReadWriteCloser) {
-	var (
-		packet   = make([]byte, bufferSize)
-		buf1     = make([]byte, bufferSize)
-		buf2     = make([]byte, bufferSize)
-		remoteIP byte
-		err      error
-	)
-
-	for {
-		packet, remoteIP, err = readNextPacket(iface, packet)
-		if err != nil {
-			log.Fatalf("Failed to read from interface: %v", err)
-		}
-
-		route := routingTable[remoteIP].Load()
-		if !route.Up {
-			log.Printf("Route not connected: %d", remoteIP)
-			continue
-		}
-
-		_sendDataPacket(route, packet, buf1, buf2)
-	}
-}

node/packets-util.go

@@ -1,163 +0,0 @@
-package node
-
-import (
-	"net/netip"
-	"sync/atomic"
-	"time"
-	"unsafe"
-)
-
-var traceIDCounter uint64 = uint64(time.Now().Unix()<<30) + 1
-
-func newTraceID() uint64 {
-	return atomic.AddUint64(&traceIDCounter, 1)
-}
-
-// ----------------------------------------------------------------------------
-
-type binWriter struct {
-	b []byte
-	i int
-}
-
-func newBinWriter(buf []byte) *binWriter {
-	buf = buf[:cap(buf)]
-	return &binWriter{buf, 0}
-}
-
-func (w *binWriter) Bool(b bool) *binWriter {
-	if b {
-		return w.Byte(1)
-	}
-	return w.Byte(0)
-}
-
-func (w *binWriter) Byte(b byte) *binWriter {
-	w.b[w.i] = b
-	w.i++
-	return w
-}
-
-func (w *binWriter) SharedKey(key [32]byte) *binWriter {
-	copy(w.b[w.i:w.i+32], key[:])
-	w.i += 32
-	return w
-}
-
-func (w *binWriter) Uint16(x uint16) *binWriter {
-	*(*uint16)(unsafe.Pointer(&w.b[w.i])) = x
-	w.i += 2
-	return w
-}
-
-func (w *binWriter) Uint64(x uint64) *binWriter {
-	*(*uint64)(unsafe.Pointer(&w.b[w.i])) = x
-	w.i += 8
-	return w
-}
-
-func (w *binWriter) Int64(x int64) *binWriter {
-	*(*int64)(unsafe.Pointer(&w.b[w.i])) = x
-	w.i += 8
-	return w
-}
-
-func (w *binWriter) AddrPort(addrPort netip.AddrPort) *binWriter {
-	addr := addrPort.Addr().As16()
-	copy(w.b[w.i:w.i+16], addr[:])
-	w.i += 16
-	return w.Uint16(addrPort.Port())
-}
-
-func (w *binWriter) Build() []byte {
-	return w.b[:w.i]
-}
-
-// ----------------------------------------------------------------------------
-
-type binReader struct {
-	b   []byte
-	i   int
-	err error
-}
-
-func newBinReader(buf []byte) *binReader {
-	return &binReader{b: buf}
-}
-
-func (r *binReader) hasBytes(n int) bool {
-	if r.err != nil || (len(r.b)-r.i) < n {
-		r.err = errMalformedPacket
-		return false
-	}
-	return true
-}
-
-func (r *binReader) Bool(b *bool) *binReader {
-	var bb byte
-	r.Byte(&bb)
-	*b = bb != 0
-	return r
-}
-
-func (r *binReader) Byte(b *byte) *binReader {
-	if !r.hasBytes(1) {
-		return r
-	}
-	*b = r.b[r.i]
-	r.i++
-	return r
-}
-
-func (r *binReader) SharedKey(x *[32]byte) *binReader {
-	if !r.hasBytes(32) {
-		return r
-	}
-	*x = ([32]byte)(r.b[r.i : r.i+32])
-	r.i += 32
-	return r
-}
-
-func (r *binReader) Uint16(x *uint16) *binReader {
-	if !r.hasBytes(2) {
-		return r
-	}
-	*x = *(*uint16)(unsafe.Pointer(&r.b[r.i]))
-	r.i += 2
-	return r
-}
-
-func (r *binReader) Uint64(x *uint64) *binReader {
-	if !r.hasBytes(8) {
-		return r
-	}
-	*x = *(*uint64)(unsafe.Pointer(&r.b[r.i]))
-	r.i += 8
-	return r
-}
-
-func (r *binReader) Int64(x *int64) *binReader {
-	if !r.hasBytes(8) {
-		return r
-	}
-	*x = *(*int64)(unsafe.Pointer(&r.b[r.i]))
-	r.i += 8
-	return r
-}
-
-func (r *binReader) AddrPort(x *netip.AddrPort) *binReader {
-	if !r.hasBytes(18) {
-		return r
-	}
-	addr := netip.AddrFrom16(([16]byte)(r.b[r.i : r.i+16])).Unmap()
-	r.i += 16
-
-	var port uint16
-	r.Uint16(&port)
-	*x = netip.AddrPortFrom(addr, port)
-	return r
-}
-
-func (r *binReader) Error() error {
-	return r.err
-}

node/packets-util_test.go

@@ -1,40 +0,0 @@
-package node
-
-import (
-	"net/netip"
-	"reflect"
-	"testing"
-)
-
-func TestBinWriteRead(t *testing.T) {
-	buf := make([]byte, 1024)
-
-	type Item struct {
-		Type     byte
-		TraceID  uint64
-		DestAddr netip.AddrPort
-	}
-
-	in := Item{1, 2, netip.AddrPortFrom(netip.AddrFrom4([4]byte{1, 2, 3, 4}), 22)}
-
-	buf = newBinWriter(buf).
-		Byte(in.Type).
-		Uint64(in.TraceID).
-		AddrPort(in.DestAddr).
-		Build()
-
-	out := Item{}
-
-	err := newBinReader(buf).
-		Byte(&out.Type).
-		Uint64(&out.TraceID).
-		AddrPort(&out.DestAddr).
-		Error()
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if !reflect.DeepEqual(in, out) {
-		t.Fatal(in, out)
-	}
-}

node/packets.go

@@ -1,140 +0,0 @@
-package node
-
-import (
-	"errors"
-	"net/netip"
-)
-
-var (
-	errMalformedPacket   = errors.New("malformed packet")
-	errUnknownPacketType = errors.New("unknown packet type")
-)
-
-const (
-	packetTypeSyn = iota + 1
-	packetTypeSynAck
-	packetTypeAck
-	packetTypeProbe
-	packetTypeAddrDiscovery
-)
-
-// ----------------------------------------------------------------------------
-
-type controlPacket struct {
-	SrcIP   byte
-	SrcAddr netip.AddrPort
-	Payload any
-}
-
-func (p *controlPacket) ParsePayload(buf []byte) (err error) {
-	switch buf[0] {
-	case packetTypeSyn:
-		p.Payload, err = parseSynPacket(buf)
-	case packetTypeSynAck:
-		p.Payload, err = parseSynAckPacket(buf)
-	case packetTypeProbe:
-		p.Payload, err = parseProbePacket(buf)
-	case packetTypeAddrDiscovery:
-		p.Payload, err = parseAddrDiscoveryPacket(buf)
-	default:
-		return errUnknownPacketType
-	}
-	return err
-}
-
-// ----------------------------------------------------------------------------
-
-type synPacket struct {
-	TraceID   uint64   // TraceID to match response w/ request.
-	SharedKey [32]byte // Our shared key.
-	Direct    bool
-	FromAddr  netip.AddrPort // The client's sending address.
-}
-
-func (p synPacket) Marshal(buf []byte) []byte {
-	return newBinWriter(buf).
-		Byte(packetTypeSyn).
-		Uint64(p.TraceID).
-		SharedKey(p.SharedKey).
-		Bool(p.Direct).
-		AddrPort(p.FromAddr).
-		Build()
-}
-
-func parseSynPacket(buf []byte) (p synPacket, err error) {
-	err = newBinReader(buf[1:]).
-		Uint64(&p.TraceID).
-		SharedKey(&p.SharedKey).
-		Bool(&p.Direct).
-		AddrPort(&p.FromAddr).
-		Error()
-	return
-}
-
-// ----------------------------------------------------------------------------
-
-type synAckPacket struct {
-	TraceID  uint64
-	FromAddr netip.AddrPort
-}
-
-func (p synAckPacket) Marshal(buf []byte) []byte {
-	return newBinWriter(buf).
-		Byte(packetTypeSynAck).
-		Uint64(p.TraceID).
-		AddrPort(p.FromAddr).
-		Build()
-}
-
-func parseSynAckPacket(buf []byte) (p synAckPacket, err error) {
-	err = newBinReader(buf[1:]).
-		Uint64(&p.TraceID).
-		AddrPort(&p.FromAddr).
-		Error()
-	return
-}
-
-// ----------------------------------------------------------------------------
-
-type addrDiscoveryPacket struct {
-	TraceID uint64
-	ToAddr  netip.AddrPort
-}
-
-func (p addrDiscoveryPacket) Marshal(buf []byte) []byte {
-	return newBinWriter(buf).
-		Byte(packetTypeAddrDiscovery).
-		Uint64(p.TraceID).
-		AddrPort(p.ToAddr).
-		Build()
-}
-
-func parseAddrDiscoveryPacket(buf []byte) (p addrDiscoveryPacket, err error) {
-	err = newBinReader(buf[1:]).
-		Uint64(&p.TraceID).
-		AddrPort(&p.ToAddr).
-		Error()
-	return
-}
-
-// ----------------------------------------------------------------------------
-
-// A probeReqPacket is sent from a client to a server to determine if direct
-// UDP communication can be used.
-type probePacket struct {
-	TraceID uint64
-}
-
-func (p probePacket) Marshal(buf []byte) []byte {
-	return newBinWriter(buf).
-		Byte(packetTypeProbe).
-		Uint64(p.TraceID).
-		Build()
-}
-
-func parseProbePacket(buf []byte) (p probePacket, err error) {
-	err = newBinReader(buf[1:]).
-		Uint64(&p.TraceID).
-		Error()
-	return
-}

node/packets_test.go

@@ -1,42 +0,0 @@
-package node
-
-import (
-	"crypto/rand"
-	"net/netip"
-	"reflect"
-	"testing"
-)
-
-func TestPacketSyn(t *testing.T) {
-	in := synPacket{
-		TraceID:  newTraceID(),
-		RelayIP:  4,
-		FromAddr: netip.AddrPortFrom(netip.AddrFrom4([4]byte{4, 5, 6, 7}), 22),
-	}
-	rand.Read(in.SharedKey[:])
-
-	out, err := parseSynPacket(in.Marshal(make([]byte, bufferSize)))
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if !reflect.DeepEqual(in, out) {
-		t.Fatal("\n", in, "\n", out)
-	}
-}
-
-func TestPacketSynAck(t *testing.T) {
-	in := synAckPacket{
-		TraceID:  newTraceID(),
-		FromAddr: netip.AddrPortFrom(netip.AddrFrom4([4]byte{4, 5, 6, 7}), 22),
-	}
-
-	out, err := parseSynAckPacket(in.Marshal(make([]byte, bufferSize)))
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	if !reflect.DeepEqual(in, out) {
-		t.Fatal("\n", in, "\n", out)
-	}
-}

node/peer-supervisor.go

@@ -1,331 +0,0 @@
-package node
-
-import (
-	"fmt"
-	"log"
-	"net/netip"
-	"sync/atomic"
-	"time"
-	"vppn/m"
-)
-
-const (
-	pingInterval    = 8 * time.Second
-	timeoutInterval = 25 * time.Second
-)
-
-// ----------------------------------------------------------------------------
-
-type peerSupervisor struct {
-	// The purpose of this state machine is to manage this published data.
-	published *atomic.Pointer[peerRoute]
-	staged    peerRoute // Local copy of shared data. See publish().
-
-	// Immutable data.
-	remoteIP byte // Remote VPN IP.
-
-	// Mutable peer data.
-	peer      *m.Peer
-	remotePub bool
-
-	// Incoming events.
-	peerUpdates    chan *m.Peer
-	controlPackets chan controlPacket
-
-	// Buffers for sending control packets.
-	buf1 []byte
-	buf2 []byte
-}
-
-func newPeerSupervisor(i int) *peerSupervisor {
-	return &peerSupervisor{
-		published:      routingTable[i],
-		remoteIP:       byte(i),
-		peerUpdates:    peerUpdates[i],
-		controlPackets: controlPackets[i],
-		buf1:           make([]byte, bufferSize),
-		buf2:           make([]byte, bufferSize),
-	}
-}
-
-type stateFunc func() stateFunc
-
-func (s *peerSupervisor) Run() {
-	state := s.noPeer
-	for {
-		state = state()
-	}
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) sendControlPacket(pkt interface{ Marshal([]byte) []byte }) {
-	_sendControlPacket(pkt, s.staged, s.buf1, s.buf2)
-	time.Sleep(500 * time.Millisecond) // Rate limit packets.
-}
-
-func (s *peerSupervisor) sendControlPacketTo(
-	pkt interface{ Marshal([]byte) []byte },
-	addr netip.AddrPort,
-) {
-	if !addr.IsValid() {
-		s.logf("ERROR: Attepted to send packet to invalid address: %v", addr)
-		return
-	}
-	route := s.staged
-	route.Direct = true
-	route.RemoteAddr = addr
-	_sendControlPacket(pkt, route, s.buf1, s.buf2)
-	time.Sleep(500 * time.Millisecond) // Rate limit packets.
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) logf(msg string, args ...any) {
-	log.Printf(fmt.Sprintf("[%03d] ", s.remoteIP)+msg, args...)
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) publish() {
-	data := s.staged
-	s.published.Store(&data)
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) noPeer() stateFunc {
-	return s.peerUpdate(<-s.peerUpdates)
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) peerUpdate(peer *m.Peer) stateFunc {
-	return func() stateFunc { return s._peerUpdate(peer) }
-}
-
-func (s *peerSupervisor) _peerUpdate(peer *m.Peer) stateFunc {
-	defer s.publish()
-
-	s.peer = peer
-	s.staged = peerRoute{}
-
-	if s.peer == nil {
-		return s.noPeer
-	}
-
-	s.staged.IP = s.remoteIP
-	s.staged.ControlCipher = newControlCipher(privateKey, peer.PubKey)
-	s.staged.DataCipher = newDataCipher()
-
-	if ip, isValid := netip.AddrFromSlice(peer.PublicIP); isValid {
-		s.remotePub = true
-		s.staged.Relay = peer.Relay
-		s.staged.Direct = true
-		s.staged.RemoteAddr = netip.AddrPortFrom(ip, peer.Port)
-	} else if localPub {
-		s.staged.Direct = true
-	}
-
-	if s.remotePub == localPub {
-		if localIP < s.remoteIP {
-			return s.server
-		}
-		return s.client
-	}
-
-	if s.remotePub {
-		return s.client
-	}
-	return s.server
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) server() stateFunc {
-	logf := func(format string, args ...any) { s.logf("SERVER "+format, args...) }
-
-	logf("DOWN")
-
-	var (
-		syn          synPacket
-		timeoutTimer = time.NewTimer(timeoutInterval)
-	)
-
-	for {
-		select {
-		case peer := <-s.peerUpdates:
-			return s.peerUpdate(peer)
-
-		case pkt := <-s.controlPackets:
-			switch p := pkt.Payload.(type) {
-
-			case synPacket:
-				// Before we can respond to this packet, we need to make sure the
-				// route is setup properly.
-				//
-				// The client will update the syn's TraceID whenever there's a change.
-				// The server will follow the client's request.
-				if p.TraceID != syn.TraceID || !s.staged.Up {
-					if p.Direct {
-						logf("UP - Direct")
-					} else {
-						logf("UP - Relayed")
-					}
-
-					syn = p
-					s.staged.Up = true
-					s.staged.Direct = syn.Direct
-					s.staged.DataCipher = newDataCipherFromKey(syn.SharedKey)
-					s.staged.RemoteAddr = pkt.SrcAddr
-
-					s.publish()
-				}
-
-				// We should always respond.
-				ack := synAckPacket{
-					TraceID:  syn.TraceID,
-					FromAddr: getLocalAddr(),
-				}
-				s.sendControlPacket(ack)
-
-				if s.staged.Direct {
-					continue
-				}
-
-				if !syn.FromAddr.IsValid() {
-					continue
-				}
-
-				probe := probePacket{TraceID: newTraceID()}
-				s.sendControlPacketTo(probe, syn.FromAddr)
-
-			case probePacket:
-				if pkt.SrcAddr.IsValid() {
-					s.sendControlPacketTo(probePacket{TraceID: p.TraceID}, pkt.SrcAddr)
-				} else {
-					logf("Invalid probe address")
-				}
-			}
-
-		case <-timeoutTimer.C:
-			logf("Connection timeout")
-			s.staged.Up = false
-			s.publish()
-		}
-	}
-}
-
-// ----------------------------------------------------------------------------
-
-func (s *peerSupervisor) client() stateFunc {
-	logf := func(format string, args ...any) { s.logf("CLIENT "+format, args...) }
-
-	logf("DOWN")
-
-	var (
-		syn = synPacket{
-			TraceID:   newTraceID(),
-			SharedKey: s.staged.DataCipher.Key(),
-			Direct:    s.staged.Direct,
-			FromAddr:  getLocalAddr(),
-		}
-
-		ack synAckPacket
-
-		probe     probePacket
-		probeAddr netip.AddrPort
-
-		lAddr netip.AddrPort
-
-		timeoutTimer = time.NewTimer(timeoutInterval)
-		pingTimer    = time.NewTimer(pingInterval)
-	)
-
-	defer timeoutTimer.Stop()
-	defer pingTimer.Stop()
-
-	s.sendControlPacket(syn)
-
-	for {
-		select {
-
-		case peer := <-s.peerUpdates:
-			return s.peerUpdate(peer)
-
-		case pkt := <-s.controlPackets:
-			switch p := pkt.Payload.(type) {
-
-			case synAckPacket:
-				if p.TraceID != syn.TraceID {
-					continue // Hmm...
-				}
-
-				ack = p
-				timeoutTimer.Reset(timeoutInterval)
-
-				if !s.staged.Up {
-					if s.staged.Direct {
-						logf("UP - Direct")
-					} else {
-						logf("UP - Relayed")
-					}
-
-					s.staged.Up = true
-					s.publish()
-				}
-
-			case probePacket:
-				if s.staged.Direct {
-					continue
-				}
-
-				if p.TraceID != probe.TraceID {
-					continue
-				}
-
-				// Upgrade connection.
-
-				logf("UP - Direct")
-				s.staged.Direct = true
-				s.staged.RemoteAddr = probeAddr
-				s.publish()
-
-				syn.TraceID = newTraceID()
-				syn.Direct = true
-				syn.FromAddr = getLocalAddr()
-				s.sendControlPacket(syn)
-			}
-
-		case <-pingTimer.C:
-			// Send syn.
-
-			syn.FromAddr = getLocalAddr()
-			if syn.FromAddr != lAddr {
-				syn.TraceID = newTraceID()
-				lAddr = syn.FromAddr
-			}
-
-			s.sendControlPacket(syn)
-
-			pingTimer.Reset(pingInterval)
-
-			if s.staged.Direct {
-				continue
-			}
-
-			if !ack.FromAddr.IsValid() {
-				continue
-			}
-
-			probe = probePacket{TraceID: newTraceID()}
-			probeAddr = ack.FromAddr
-
-			s.sendControlPacketTo(probe, ack.FromAddr)
-
-		case <-timeoutTimer.C:
-			logf("Connection timeout")
-			return s.peerUpdate(s.peer)
-		}
-	}
-}

node/relaymanager.go

@@ -1,40 +0,0 @@
-package node
-
-import (
-	"log"
-	"math/rand"
-	"time"
-)
-
-func relayManager() {
-	time.Sleep(2 * time.Second)
-	updateRelayRoute()
-
-	for range time.Tick(8 * time.Second) {
-		relay := getRelayRoute()
-		if relay == nil || !relay.Up || !relay.Relay {
-			updateRelayRoute()
-		}
-	}
-}
-
-func updateRelayRoute() {
-	possible := make([]*peerRoute, 0, 8)
-	for i := range routingTable {
-		route := routingTable[i].Load()
-		if !route.Up || !route.Relay {
-			continue
-		}
-		possible = append(possible, route)
-	}
-
-	if len(possible) == 0 {
-		log.Printf("No relay available.")
-		relayIP.Store(nil)
-		return
-	}
-
-	ip := possible[rand.Intn(len(possible))].IP
-	log.Printf("New relay IP: %d", ip)
-	relayIP.Store(&ip)
-}

peer/crypto.go

@@ -0,0 +1,15 @@
+package peer
+
+import (
+	"log"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+func generateWGKey() wgtypes.Key {
+	key, err := wgtypes.GeneratePrivateKey()
+	if err != nil {
+		log.Fatalf("Failed to generate WireGuard private key: %v", err)
+	}
+	return key
+}

peer/data-flow.dot

@@ -0,0 +1,13 @@
+digraph d {
+    ifReader   -> remote;
+
+    connReader -> remote;
+    mcReader   -> remote;
+    remote -> connWriter;
+    remote -> ifWriter;
+    hubPoller  -> remote;
+
+    connWriter [shape="box"];
+    mcWriter [shape="box"];
+    ifWriter [shape="box"];
+}

peer/files.go

@@ -1,4 +1,4 @@
-package node
+package peer
 
 import (
 	"encoding/json"
@@ -8,6 +8,12 @@ import (
 	"vppn/m"
 )
 
+type LocalConfig struct {
+	LocalPeerIP byte
+	Network     []byte
+	WGPrivKey   string
+}
+
 func configDir(netName string) string {
 	d, err := os.UserHomeDir()
 	if err != nil {
@@ -16,12 +22,20 @@ func configDir(netName string) string {
 	return filepath.Join(d, ".vppn", netName)
 }
 
+func lockFilePath(netName string) string {
+	return filepath.Join(configDir(netName), "__lock__")
+}
+
 func peerConfigPath(netName string) string {
-	return filepath.Join(configDir(netName), "peer-config.json")
+	return filepath.Join(configDir(netName), "config.json")
 }
 
 func peerStatePath(netName string) string {
-	return filepath.Join(configDir(netName), "peer-state.json")
+	return filepath.Join(configDir(netName), "state.json")
+}
+
+func statusSocketPath(netName string) string {
+	return filepath.Join(configDir(netName), "status.sock")
 }
 
 func storeJson(x any, outPath string) error {
@@ -56,7 +70,7 @@ func storeJson(x any, outPath string) error {
 	return os.Rename(tmpPath, outPath)
 }
 
-func storePeerConfig(netName string, pc m.PeerConfig) error {
+func storePeerConfig(netName string, pc LocalConfig) error {
 	return storeJson(pc, peerConfigPath(netName))
 }
 
@@ -73,10 +87,11 @@ func loadJson(dataPath string, ptr any) error {
 	return json.Unmarshal(data, ptr)
 }
 
-func loadPeerConfig(netName string) (pc m.PeerConfig, err error) {
+func loadPeerConfig(netName string) (pc LocalConfig, err error) {
 	return pc, loadJson(peerConfigPath(netName), &pc)
 }
 
 func loadNetworkState(netName string) (ps m.NetworkState, err error) {
 	return ps, loadJson(peerStatePath(netName), &ps)
 }
+

peer/files_test.go

@@ -0,0 +1,57 @@
+package peer
+
+import (
+	"path/filepath"
+	"reflect"
+	"testing"
+)
+
+func TestFilePaths(t *testing.T) {
+	confDir := configDir("netName")
+	if filepath.Base(confDir) != "netName" {
+		t.Fatal(confDir)
+	}
+	if filepath.Base(filepath.Dir(confDir)) != ".vppn" {
+		t.Fatal(confDir)
+	}
+
+	path := peerConfigPath("netName")
+	if path != filepath.Join(confDir, "config.json") {
+		t.Fatal(path)
+	}
+
+	path = peerStatePath("netName")
+	if path != filepath.Join(confDir, "state.json") {
+		t.Fatal(path)
+	}
+}
+
+func TestStoreLoadJson(t *testing.T) {
+	type Object struct {
+		Name  string
+		Age   int
+		Price float64
+	}
+
+	tmpDir := t.TempDir()
+	outPath := filepath.Join(tmpDir, "object.json")
+
+	obj := Object{
+		Name:  "Jason",
+		Age:   22,
+		Price: 123.534,
+	}
+
+	if err := storeJson(obj, outPath); err != nil {
+		t.Fatal(err)
+	}
+
+	obj2 := Object{}
+	if err := loadJson(outPath, &obj2); err != nil {
+		t.Fatal(err)
+	}
+
+	if !reflect.DeepEqual(obj, obj2) {
+		t.Fatal(obj, obj2)
+	}
+}

peer/globals.go

@@ -0,0 +1,39 @@
+package peer
+
+import (
+	"net"
+	"net/netip"
+	"time"
+
+	"golang.zx2c4.com/wireguard/wgctrl"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+const (
+	broadcastInterval             = 16 * time.Second
+	broadcastErrorTimeoutInterval = 8 * time.Second
+)
+
+var multicastAddr = net.UDPAddrFromAddrPort(netip.AddrPortFrom(
+	netip.AddrFrom4([4]byte{224, 0, 0, 157}),
+	4560))
+
+type Globals struct {
+	LocalConfig // Embed, immutable.
+
+	// WireGuard private key, client, and device name. Immutable after init.
+	WGPrivKey wgtypes.Key
+	WGClient  *wgctrl.Client
+	WGDevName string
+
+	// Local public address (if available). Immutable.
+	LocalAddr      netip.AddrPort
+	LocalAddrValid bool
+}
+
+func NewGlobals(localConfig LocalConfig, localAddr netip.AddrPort) (g Globals) {
+	g.LocalConfig = localConfig
+	g.LocalAddr = localAddr
+	g.LocalAddrValid = localAddr.IsValid()
+	return g
+}

peer/hubpoller.go

@@ -0,0 +1,148 @@
+package peer
+
+import (
+	"encoding/json"
+	"io"
+	"log"
+	"net/http"
+	"net/netip"
+	"net/url"
+	"time"
+	"vppn/m"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+type HubPoller struct {
+	Globals
+	holePunch *HolePunch
+	client    *http.Client
+	req       *http.Request
+	versions  [256]int64
+	netName   string
+}
+
+func NewHubPoller(
+	g Globals,
+	hp *HolePunch,
+	netName,
+	hubURL,
+	apiKey string,
+) (*HubPoller, error) {
+	u, err := url.Parse(hubURL)
+	if err != nil {
+		return nil, err
+	}
+	u.Path = "/peer/fetch-state/"
+
+	client := &http.Client{Timeout: 8 * time.Second}
+
+	req := &http.Request{
+		Method: http.MethodGet,
+		URL:    u,
+		Header: http.Header{},
+	}
+	req.SetBasicAuth("", apiKey)
+
+	return &HubPoller{
+		Globals:   g,
+		holePunch: hp,
+		client:    client,
+		req:       req,
+		netName:   netName,
+	}, nil
+}
+
+func (hp *HubPoller) logf(s string, args ...any) {
+	log.Printf("[HubPoller] "+s, args...)
+}
+
+func (hp *HubPoller) Run() {
+	state, err := loadNetworkState(hp.netName)
+	if err != nil {
+		hp.logf("Failed to load network state: %v", err)
+		hp.logf("Polling hub...")
+		hp.pollHub()
+	} else {
+		hp.applyNetworkState(state)
+	}
+
+	for range time.Tick(64 * time.Second) {
+		hp.pollHub()
+	}
+}
+
+func (hp *HubPoller) pollHub() {
+	var state m.NetworkState
+
+	resp, err := hp.client.Do(hp.req)
+	if err != nil {
+		hp.logf("Failed to fetch peer state: %v", err)
+		return
+	}
+	body, err := io.ReadAll(resp.Body)
+	_ = resp.Body.Close()
+	if err != nil {
+		hp.logf("Failed to read body from hub: %v", err)
+		return
+	}
+
+	if err := json.Unmarshal(body, &state); err != nil {
+		hp.logf("Failed to unmarshal response from hub: %v\n%s", err, body)
+		return
+	}
+
+	if err := storeNetworkState(hp.netName, state); err != nil {
+		hp.logf("Failed to store network state: %v", err)
+	}
+
+	hp.applyNetworkState(state)
+}
+
+func (hp *HubPoller) applyNetworkState(state m.NetworkState) {
+	for i, peer := range state.Peers {
+		if i == int(hp.LocalPeerIP) {
+			continue
+		}
+		if peer != nil && peer.Version == hp.versions[i] {
+			continue
+		}
+		hp.applyPeerConfig(peer)
+		if peer != nil {
+			hp.versions[i] = peer.Version
+		}
+	}
+}
+
+func (hp *HubPoller) applyPeerConfig(peer *m.Peer) {
+	if peer == nil || len(peer.WGPubKey) != wgtypes.KeyLen {
+		return
+	}
+	if len(peer.PublicIP1) == 0 || peer.Port1 == 0 {
+		return
+	}
+
+	pubKey, err := wgtypes.NewKey(peer.WGPubKey)
+	if err != nil {
+		hp.logf("Invalid WG key for peer %d: %v", peer.PeerIP, err)
+		return
+	}
+
+	ip, ok := netip.AddrFromSlice(peer.PublicIP1)
+	if !ok {
+		hp.logf("Invalid public IP for peer %d", peer.PeerIP)
+		return
+	}
+	endpoint := netip.AddrPortFrom(ip.Unmap(), peer.Port1)
+
+	if peer.Relay {
+		if err := applyBaseConfig(hp.WGClient, hp.WGDevName, pubKey, endpoint, hp.Network); err != nil {
+			hp.logf("Failed to update relay config: %v", err)
+		}
+		return
+	}
+
+	if hp.holePunch != nil {
+		hp.holePunch.OnEndpointLearned(peer.PeerIP, pubKey, endpoint, true)
+	}
+}

peer/main.go

@@ -0,0 +1,209 @@
+package peer
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net"
+	"net/http"
+	"net/netip"
+	"os"
+	"time"
+)
+
+// Usage:
+//
+// vppn netName run
+// vppn netName status
+func Main2() {
+	printUsage := func() {
+		fmt.Fprintf(os.Stderr, `%s COMMAND [ARGUMENTS...]
+
+Available commands:
+    run
+    status
+    hosts
+`, os.Args[0])
+		os.Exit(1)
+	}
+
+	if len(os.Args) < 2 {
+		printUsage()
+	}
+
+	command := os.Args[1]
+
+	switch command {
+	case "run":
+		main_run()
+	case "status":
+		main_status()
+	case "hosts":
+		main_hosts()
+	default:
+		printUsage()
+	}
+}
+
+// ----------------------------------------------------------------------------
+
+type mainArgs struct {
+	NetName    string
+	HubAddress string
+	APIKey     string
+}
+
+func main_run() {
+	printUsage := func() {
+		fmt.Fprintf(os.Stderr, `Usage: %s run NETWORK_NAME HUB_ADDRESS API_KEY
+
+    NETWORK_NAME
+        Unique name of the network interface created. The network name
+        shouldn't change between invocations of the application.
+
+    HUB_ADDRESS
+        The address of the hub server. This should also contain the scheme, for
+        example https://hub.domain.com/.
+
+    API_KEY
+        The API key assigned to this peer by the hub.
+
+`, os.Args[0])
+		os.Exit(1)
+	}
+
+	if len(os.Args) != 5 {
+		printUsage()
+	}
+
+	args := mainArgs{
+		NetName:    os.Args[2],
+		HubAddress: os.Args[3],
+		APIKey:     os.Args[4],
+	}
+
+	newPeerMain(args).Run()
+}
+
+// ----------------------------------------------------------------------------
+
+func main_status() {
+	printUsage := func() {
+		fmt.Fprintf(os.Stderr, `Usage: %s status NETWORK_NAME
+
+    NETWORK_NAME
+        Unique name of the network interface created.
+
+`, os.Args[0])
+		os.Exit(1)
+	}
+
+	if len(os.Args) != 3 {
+		printUsage()
+	}
+
+	netName := os.Args[2]
+	report := fetchStatusReport(netName)
+
+	fmt.Printf("\n%s Status\n\n", netName)
+
+	if len(report.Network) != 4 {
+		fmt.Println("ERROR: Network isn't 4 bytes.")
+		fmt.Printf("Network: %v\n\n", report.Network)
+	} else {
+		nw := report.Network
+		fmt.Printf("%-8s %d.%d.%d.%d\n", "IP", nw[0], nw[1], nw[2], report.LocalPeerIP)
+		fmt.Printf("%-8s %d.%d.%d.%d/24\n", "Network", nw[0], nw[1], nw[2], nw[3])
+	}
+
+	if report.RelayPeerIP != 0 {
+		fmt.Printf("%-8s %d\n\n", "Relay", report.RelayPeerIP)
+	} else {
+		fmt.Printf("%-8s -\n\n", "Relay")
+	}
+
+	for _, status := range report.Remotes {
+		fmt.Printf("%3d %s\n", status.PeerIP, status.Name)
+		fmt.Printf("    %-11s %v\n", "Up", status.Up)
+
+		pubIP, ok := netip.AddrFromSlice(status.PublicIP)
+		if ok {
+			fmt.Printf("    %-11s %v\n", "Public IP", pubIP)
+		} else {
+			fmt.Printf("    %-11s\n", "Public IP")
+		}
+		fmt.Printf("    %-11s %d\n", "Port", status.Port)
+		fmt.Printf("    %-11s %v\n", "Relay", status.Relay)
+		fmt.Printf("    %-11s %v\n", "Server", status.Server)
+		fmt.Printf("    %-11s %v\n", "Direct", status.Direct)
+		if status.DirectAddr.IsValid() {
+			fmt.Printf("    %-11s %v\n", "Address", status.DirectAddr)
+		}
+		fmt.Println("")
+	}
+}
+
+// ----------------------------------------------------------------------------
+
+func main_hosts() {
+	printUsage := func() {
+		fmt.Fprintf(os.Stderr, `Usage: %s hosts NETWORK_NAME
+
+    NETWORK_NAME
+        Unique name of the network interface created.
+
+`, os.Args[0])
+		os.Exit(1)
+	}
+
+	if len(os.Args) != 3 {
+		printUsage()
+	}
+
+	netName := os.Args[2]
+	state, err := loadNetworkState(netName)
+	if err != nil {
+		log.Fatalf("Failed to load network state: %v", err)
+	}
+
+	config, err := loadPeerConfig(netName)
+	if err != nil {
+		log.Fatalf("Failed to load config: %v", err)
+	}
+
+	nw := config.Network
+	for _, peer := range state.Peers {
+		if peer == nil {
+			continue
+		}
+		fmt.Printf("%d.%d.%d.%d %s\n",
+			nw[0], nw[1], nw[2], peer.PeerIP, peer.Name)
+	}
+	fmt.Println("")
+}
+
+// ----------------------------------------------------------------------------
+
+func fetchStatusReport(netName string) StatusReport {
+	client := http.Client{
+		Transport: &http.Transport{
+			Dial: func(_, _ string) (net.Conn, error) {
+				return net.Dial("unix", statusSocketPath(netName))
+			},
+		},
+		Timeout: 8 * time.Second,
+	}
+
+	getURL := "http://unix" + statusSocketPath(netName)
+	resp, err := client.Get(getURL)
+	if err != nil {
+		log.Fatalf("Failed to get response: %v", err)
+	}
+
+	report := StatusReport{}
+	if err := json.NewDecoder(resp.Body).Decode(&report); err != nil {
+		log.Fatalf("Failed to decode status report: %v", err)
+	}
+
+	return report
+}

peer/mcreader.go

@@ -0,0 +1,66 @@
+package peer
+
+import (
+	"encoding/binary"
+	"fmt"
+	"log"
+	"net"
+	"net/netip"
+	"time"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+func RunMCReader(g Globals, hp *HolePunch, netName string) {
+	for {
+		if err := runMCReaderInner(g, hp, netName); err != nil {
+			log.Printf("[MCReader] %v", err)
+		}
+		time.Sleep(broadcastErrorTimeoutInterval)
+	}
+}
+
+func runMCReaderInner(g Globals, hp *HolePunch, netName string) error {
+	conn, err := net.ListenMulticastUDP("udp", nil, multicastAddr)
+	if err != nil {
+		return fmt.Errorf("bind: %w", err)
+	}
+	defer conn.Close()
+
+	buf := make([]byte, 64)
+	for {
+		conn.SetReadDeadline(time.Now().Add(32 * time.Second))
+		n, src, err := conn.ReadFromUDPAddrPort(buf)
+		if err != nil {
+			return fmt.Errorf("read: %w", err)
+		}
+		if n != beaconLen {
+			continue
+		}
+		handleBeacon(g, hp, netName, buf[:n], src)
+	}
+}
+
+func handleBeacon(g Globals, hp *HolePunch, netName string, beacon []byte, src netip.AddrPort) {
+	peerIPByte := beacon[0]
+	if peerIPByte == g.LocalPeerIP {
+		return
+	}
+
+	pubKey, err := wgtypes.NewKey(beacon[1:33])
+	if err != nil {
+		return
+	}
+
+	// Skip relay peers: probing would replace their /24 AllowedIPs with empty.
+	if state, err := loadNetworkState(netName); err == nil {
+		if p := state.Peers[peerIPByte]; p != nil && p.Relay {
+			return
+		}
+	}
+
+	wgPort := binary.BigEndian.Uint16(beacon[33:35])
+	endpoint := netip.AddrPortFrom(src.Addr().Unmap(), wgPort)
+
+	hp.OnEndpointLearned(peerIPByte, pubKey, endpoint, false)
+}

peer/mcwriter.go

@@ -0,0 +1,43 @@
+package peer
+
+import (
+	"encoding/binary"
+	"fmt"
+	"log"
+	"net"
+	"time"
+)
+
+const beaconLen = 35 // 1 VPN IP byte + 32 WG pubkey + 2 WG listen port
+
+func RunMCWriter(g Globals) {
+	conn, err := net.ListenMulticastUDP("udp", nil, multicastAddr)
+	if err != nil {
+		log.Fatalf("[MCWriter] bind: %v", err)
+	}
+
+	for range time.Tick(broadcastInterval) {
+		beacon, err := buildBeacon(g)
+		if err != nil {
+			log.Printf("[MCWriter] build beacon: %v", err)
+			continue
+		}
+		log.Printf("[MCWriter] Broadcasting on %v...", multicastAddr)
+		if _, err := conn.WriteToUDP(beacon, multicastAddr); err != nil {
+			log.Printf("[MCWriter] write: %v", err)
+		}
+	}
+}
+
+func buildBeacon(g Globals) ([]byte, error) {
+	dev, err := g.WGClient.Device(g.WGDevName)
+	if err != nil {
+		return nil, fmt.Errorf("get WG device: %w", err)
+	}
+	beacon := make([]byte, beaconLen)
+	beacon[0] = g.LocalPeerIP
+	pubKey := g.WGPrivKey.PublicKey()
+	copy(beacon[1:33], pubKey[:])
+	binary.BigEndian.PutUint16(beacon[33:35], uint16(dev.ListenPort))
+	return beacon, nil
+}

peer/peer.go

@@ -0,0 +1,220 @@
+package peer
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"log"
+	"net/http"
+	"net/netip"
+	"net/url"
+	"os"
+	"vppn/m"
+
+	"git.crumpington.com/lib/go/flock"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+type peerMain struct {
+	Globals
+	netName          string
+	holePunch        *HolePunch
+	controlServer    *ControlServer
+	endpointReporter *EndpointReporter // non-nil on relay peers only
+	hubPoller        *HubPoller
+	lockFile         *os.File
+}
+
+func newPeerMain(args mainArgs) *peerMain {
+	logf := func(s string, args ...any) {
+		log.Printf("[Main] "+s, args...)
+	}
+
+	if err := os.MkdirAll(configDir(args.NetName), 0700); err != nil {
+		log.Fatalf("Failed to create config directory: %v", err)
+	}
+
+	lockFile, err := flock.TryLock(lockFilePath(args.NetName))
+	if err != nil {
+		log.Fatalf("Failed to open lock file: %v", err)
+	}
+	if lockFile == nil {
+		log.Fatalf("Failed to obtain file lock.")
+	}
+
+	config, err := loadPeerConfig(args.NetName)
+	if err != nil {
+		logf("Failed to load configuration: %v", err)
+		logf("Initializing...")
+		initPeerWithHub(args)
+
+		config, err = loadPeerConfig(args.NetName)
+		if err != nil {
+			log.Fatalf("Failed to load configuration: %v", err)
+		}
+	}
+
+	state, err := loadNetworkState(args.NetName)
+	if err != nil {
+		log.Fatalf("Failed to load network state: %v", err)
+	}
+
+	wgPrivKey, err := wgtypes.ParseKey(config.WGPrivKey)
+	if err != nil {
+		log.Fatalf("Failed to parse WireGuard private key: %v", err)
+	}
+
+	localPeer := state.Peers[config.LocalPeerIP]
+	var listenPort int
+	if localPeer != nil {
+		listenPort = int(localPeer.Port1)
+	}
+
+	vpnIP := netip.AddrFrom4([4]byte{
+		config.Network[0],
+		config.Network[1],
+		config.Network[2],
+		config.LocalPeerIP,
+	})
+
+	wgClient, err := createWGDevice(args.NetName, wgPrivKey, listenPort, vpnIP, config.Network)
+	if err != nil {
+		log.Fatalf("Failed to create WireGuard device: %v", err)
+	}
+
+	for _, p := range state.Peers {
+		if p == nil || !p.Relay || p.PeerIP == config.LocalPeerIP {
+			continue
+		}
+		if len(p.WGPubKey) != wgtypes.KeyLen || len(p.PublicIP1) == 0 || p.Port1 == 0 {
+			continue
+		}
+		relayPubKey, err := wgtypes.NewKey(p.WGPubKey)
+		if err != nil {
+			logf("Invalid relay WG key: %v", err)
+			continue
+		}
+		relayIP, ok := netip.AddrFromSlice(p.PublicIP1)
+		if !ok {
+			continue
+		}
+		relayEndpoint := netip.AddrPortFrom(relayIP.Unmap(), p.Port1)
+		if err := applyBaseConfig(wgClient, args.NetName, relayPubKey, relayEndpoint, config.Network); err != nil {
+			logf("Failed to apply relay base config: %v", err)
+		}
+		break
+	}
+
+	g := NewGlobals(config, netip.AddrPort{})
+	g.WGPrivKey = wgPrivKey
+	g.WGClient = wgClient
+	g.WGDevName = args.NetName
+
+	holePunch := NewHolePunch(g)
+
+	controlServer, err := NewControlServer(g, holePunch, args.NetName)
+	if err != nil {
+		log.Fatalf("Failed to create control server: %v", err)
+	}
+
+	var endpointReporter *EndpointReporter
+	if localPeer != nil && localPeer.Relay {
+		if err := enableForwarding(args.NetName); err != nil {
+			log.Fatalf("Failed to enable IP forwarding: %v", err)
+		}
+		endpointReporter = NewEndpointReporter(g, controlServer, args.NetName)
+	}
+
+	hubPoller, err := NewHubPoller(g, holePunch, args.NetName, args.HubAddress, args.APIKey)
+	if err != nil {
+		log.Fatalf("Failed to create hub poller: %v", err)
+	}
+
+	go runStatusServer(g, statusSocketPath(args.NetName))
+
+	return &peerMain{
+		Globals:          g,
+		netName:          args.NetName,
+		holePunch:        holePunch,
+		controlServer:    controlServer,
+		endpointReporter: endpointReporter,
+		hubPoller:        hubPoller,
+		lockFile:         lockFile,
+	}
+}
+
+func (p *peerMain) Run() {
+	go p.controlServer.Run()
+	if p.endpointReporter != nil {
+		go p.endpointReporter.Run()
+	}
+	go RunMCWriter(p.Globals)
+	go RunMCReader(p.Globals, p.holePunch, p.netName)
+	go p.hubPoller.Run()
+	select {}
+}
+
+func initPeerWithHub(args mainArgs) {
+	privKey := generateWGKey()
+	pubKey := privKey.PublicKey()
+
+	initURL, err := url.Parse(args.HubAddress)
+	if err != nil {
+		log.Fatalf("Failed to parse hub URL: %v", err)
+	}
+	initURL.Path = "/peer/init/"
+
+	initArgs := m.PeerInitArgs{
+		WGPubKey: pubKey[:],
+	}
+
+	buf := &bytes.Buffer{}
+	if err := json.NewEncoder(buf).Encode(initArgs); err != nil {
+		log.Fatalf("Failed to encode init args: %v", err)
+	}
+
+	req, err := http.NewRequest(http.MethodPost, initURL.String(), buf)
+	if err != nil {
+		log.Fatalf("Failed to construct request: %v", err)
+	}
+	req.SetBasicAuth("", args.APIKey)
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		log.Fatalf("Failed to init with hub: %v", err)
+	}
+	defer resp.Body.Close()
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		log.Fatalf("Failed to read response body: %v", err)
+	}
+
+	if resp.StatusCode == http.StatusConflict {
+		log.Fatalf("WireGuard key already registered (HTTP 409). Delete and re-create the peer to re-register.")
+	}
+	if resp.StatusCode != http.StatusOK {
+		log.Fatalf("Hub returned unexpected status %d: %s", resp.StatusCode, data)
+	}
+
+	initResp := m.PeerInitResp{}
+	if err := json.Unmarshal(data, &initResp); err != nil {
+		log.Fatalf("Failed to parse configuration: %v\n%s", err, data)
+	}
+
+	config := LocalConfig{
+		LocalPeerIP: initResp.PeerIP,
+		Network:     initResp.Network,
+		WGPrivKey:   privKey.String(),
+	}
+
+	if err := storeNetworkState(args.NetName, initResp.NetworkState); err != nil {
+		log.Fatalf("Failed to store network state: %v", err)
+	}
+
+	if err := storePeerConfig(args.NetName, config); err != nil {
+		log.Fatalf("Failed to store configuration: %v", err)
+	}
+
+	log.Print("Initialization successful.")
+}

peer/peerfsm.dot

@@ -0,0 +1,28 @@
+digraph d {
+        disconnected -> peerUpdating;
+        peerUpdating -> disconnected;
+        peerUpdating -> server;
+        peerUpdating -> clientInit;
+        server -> peerUpdating;
+        clientInit -> peerUpdating;
+        clientInit -> clientInit;
+        clientInit -> client;
+        client -> clientInit;
+        client -> peerUpdating;
+
+        clientInitializing -> clientSyncing;
+        clientSyncing -> clientInitializing;
+        clientSyncing -> clientUpIndirect;
+        clientSyncing -> clientUpDirect;
+        clientUpIndirect -> clientUpDirect;
+        clientUpIndirect -> clientInitializing;
+        clientUpDirect -> clientInitializing;
+
+        serverInitializing -> serverSyncing;
+        serverSyncing -> serverInitializing;
+        serverSyncing -> serverUpIndirect;
+        serverSyncing -> serverUpDirect;
+        serverUpIndirect -> serverUpDirect;
+        serverUpIndirect -> serverInitializing;
+        serverUpDirect -> serverInitializing;
+}

peer/statusserver.go

@@ -0,0 +1,50 @@
+package peer
+
+import (
+	"encoding/json"
+	"log"
+	"net"
+	"net/http"
+	"net/netip"
+	"os"
+)
+
+type StatusReport struct {
+	LocalPeerIP byte
+	Network     []byte
+	RelayPeerIP byte
+	Remotes     []RemoteStatus
+}
+
+type RemoteStatus struct {
+	PeerIP     byte
+	Up         bool
+	Name       string
+	PublicIP   []byte
+	Port       uint16
+	Relay      bool
+	Server     bool
+	Direct     bool
+	DirectAddr netip.AddrPort
+}
+
+func runStatusServer(g Globals, socketPath string) {
+	_ = os.RemoveAll(socketPath)
+
+	handler := func(w http.ResponseWriter, r *http.Request) {
+		report := StatusReport{
+			LocalPeerIP: g.LocalPeerIP,
+			Network:     g.Network,
+		}
+		json.NewEncoder(w).Encode(report)
+	}
+
+	server := http.Server{Handler: http.HandlerFunc(handler)}
+	unixListener, err := net.Listen("unix", socketPath)
+	if err != nil {
+		log.Fatalf("Failed to bind to unix socket: %v", err)
+	}
+	if err := server.Serve(unixListener); err != nil {
+		log.Fatalf("Failed to serve on unix socket: %v", err)
+	}
+}

peer/wginterface/interface.go

@@ -0,0 +1,224 @@
+// Package wginterface demonstrates creating and destroying a WireGuard network
+// interface using only raw system calls — no netlink library.
+//
+// Creating a typed interface (kind = "wireguard") requires the NETLINK_ROUTE
+// protocol; there is no ioctl path for it. Everything else — assigning an IP
+// address and bringing the link up — can be done with the older AF_INET ioctl
+// interface, exactly as one would for a TUN device.
+//
+// The package requires CAP_NET_ADMIN and the wireguard kernel module.
+package wginterface
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+	"slices"
+
+	"golang.org/x/sys/unix"
+)
+
+// Create creates a WireGuard interface named name, assigns vpnIP/prefixLen to
+// it, and brings it up.
+func Create(name string, vpnIP net.IP, prefixLen int) error {
+	if err := nlNewLink(name); err != nil {
+		return fmt.Errorf("failed to create wireguard link: %w", err)
+	}
+	if err := ioctlSetAddr(name, vpnIP, prefixLen); err != nil {
+		_ = Delete(name)
+		return fmt.Errorf("assign address: %w", err)
+	}
+	if err := ioctlLinkUp(name); err != nil {
+		_ = Delete(name)
+		return fmt.Errorf("link up: %w", err)
+	}
+	return nil
+}
+
+// Delete removes the named interface.
+func Delete(name string) error {
+	return nlDelLink(name)
+}
+
+// ---------------------------------------------------------------------------
+// Netlink link management
+//
+// Creating a WireGuard interface requires an RTM_NEWLINK message with a nested
+// IFLA_LINKINFO attribute whose IFLA_INFO_KIND is "wireguard". The full
+// message layout is:
+//
+//   nlmsghdr          (16 bytes)
+//   ifinfomsg         (16 bytes, all zeros for a new link)
+//   rtattr IFLA_IFNAME  → name + \0
+//   rtattr IFLA_LINKINFO
+//       rtattr IFLA_INFO_KIND → "wireguard" + \0
+//
+// All multi-byte integers are in native byte order (little-endian on
+// x86/arm64).  Every attribute is padded to a 4-byte boundary; the len field
+// in the header records the unpadded length but the attribute occupies the
+// padded size.
+
+const (
+	nlmsgHdrLen  = 16 // sizeof(struct nlmsghdr)
+	sizeofIfInfo = 16 // sizeof(struct ifinfomsg)
+
+	// Attribute types not exposed by the unix package at the level we need.
+	iflaLinkInfo = 18 // IFLA_LINKINFO — container for link-type attributes
+	iflaInfoKind = 1  // IFLA_INFO_KIND — link type string, nested inside IFLA_LINKINFO
+)
+
+// nlNewLink creates the wireguard interface using Netlink.
+func nlNewLink(name string) error {
+	// Build innermost attribute first, then wrap outward.
+	infoKind := nlAttr(iflaInfoKind, cstring("wireguard"))
+	linkInfo := nlAttr(iflaLinkInfo, infoKind)
+	ifName := nlAttr(unix.IFLA_IFNAME, cstring(name))
+
+	// ifinfomsg: all-zero = AF_UNSPEC, no index, no flags (kernel assigns index).
+	ifInfo := make([]byte, sizeofIfInfo)
+
+	payload := slices.Concat(ifInfo, ifName, linkInfo)
+	flags := uint16(unix.NLM_F_REQUEST | unix.NLM_F_ACK | unix.NLM_F_CREATE | unix.NLM_F_EXCL)
+	return nlRoundtrip(unix.RTM_NEWLINK, flags, payload)
+}
+
+func nlDelLink(name string) error {
+	iface, err := net.InterfaceByName(name)
+	if err != nil {
+		return err
+	}
+
+	// For RTM_DELLINK the kernel identifies the link by ifi_index. ifi_index
+	// sits at byte offset 4 in the ifinfomsg struct.
+	ifInfo := make([]byte, sizeofIfInfo)
+	binary.NativeEndian.PutUint32(ifInfo[4:8], uint32(iface.Index))
+
+	return nlRoundtrip(unix.RTM_DELLINK, uint16(unix.NLM_F_REQUEST|unix.NLM_F_ACK), ifInfo)
+}
+
+// nlRoundtrip opens a NETLINK_ROUTE socket, sends one request, reads the
+// NLMSG_ERROR acknowledgement, and closes the socket.
+func nlRoundtrip(msgType uint16, flags uint16, payload []byte) error {
+	fd, err := unix.Socket(unix.AF_NETLINK, unix.SOCK_RAW|unix.SOCK_CLOEXEC, unix.NETLINK_ROUTE)
+	if err != nil {
+		return fmt.Errorf("socket: %w", err)
+	}
+	defer unix.Close(fd)
+
+	if err := unix.Bind(fd, &unix.SockaddrNetlink{Family: unix.AF_NETLINK}); err != nil {
+		return fmt.Errorf("bind: %w", err)
+	}
+
+	msg := nlMsg(msgType, flags, payload)
+	if err := unix.Sendto(fd, msg, 0, &unix.SockaddrNetlink{Family: unix.AF_NETLINK}); err != nil {
+		return fmt.Errorf("sendto: %w", err)
+	}
+
+	resp := make([]byte, 4096)
+	n, _, err := unix.Recvfrom(fd, resp, 0)
+	if err != nil {
+		return fmt.Errorf("recvfrom: %w", err)
+	}
+	return nlAckErr(resp[:n])
+}
+
+// nlMsg prepends an nlmsghdr to payload.
+func nlMsg(msgType uint16, flags uint16, payload []byte) []byte {
+	buf := make([]byte, nlmsgHdrLen+len(payload))
+	binary.NativeEndian.PutUint32(buf[0:4], uint32(len(buf))) // nlmsg_len
+	binary.NativeEndian.PutUint16(buf[4:6], msgType)          // nlmsg_type
+	binary.NativeEndian.PutUint16(buf[6:8], flags)            // nlmsg_flags
+	binary.NativeEndian.PutUint32(buf[8:12], 1)               // nlmsg_seq
+	binary.NativeEndian.PutUint32(buf[12:16], 0)              // nlmsg_pid (0 = kernel)
+	copy(buf[nlmsgHdrLen:], payload)
+	return buf
+}
+
+// nlAckErr parses an NLMSG_ERROR response. The error field is a negated errno
+// (0 = success, -EEXIST = interface exists, etc.).
+func nlAckErr(resp []byte) error {
+	if len(resp) < nlmsgHdrLen+4 {
+		return fmt.Errorf("netlink response too short (%d bytes)", len(resp))
+	}
+	if binary.NativeEndian.Uint16(resp[4:6]) != unix.NLMSG_ERROR {
+		return fmt.Errorf("unexpected nlmsg_type %d", binary.NativeEndian.Uint16(resp[4:6]))
+	}
+	// Error code follows the nlmsghdr; it is a signed int32 holding -errno.
+	code := int32(binary.NativeEndian.Uint32(resp[nlmsgHdrLen:]))
+	if code != 0 {
+		return unix.Errno(-code)
+	}
+	return nil
+}
+
+// nlAttr encodes one netlink attribute: [len:u16][type:u16][data][pad to 4
+// bytes].  The len field counts the header + data (before padding); the
+// allocation is padded so that the next attribute starts on a 4-byte boundary.
+func nlAttr(attrType uint16, data []byte) []byte {
+	const hdr = 4
+	attrLen := hdr + len(data)
+	padded := (attrLen + 3) &^ 3
+	buf := make([]byte, padded)
+	binary.NativeEndian.PutUint16(buf[0:2], uint16(attrLen))
+	binary.NativeEndian.PutUint16(buf[2:4], attrType)
+	copy(buf[hdr:], data)
+	return buf
+}
+
+// ---------------------------------------------------------------------------
+// ioctl-based address assignment and link-up
+//
+// These operations could also be done via RTM_NEWADDR / RTM_NEWLINK netlink
+// messages, but the AF_INET ioctl interface is simpler.
+
+func ioctlSetAddr(name string, ip net.IP, prefixLen int) error {
+	fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_IP)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(fd)
+
+	req, err := unix.NewIfreq(name)
+	if err != nil {
+		return err
+	}
+	if err := req.SetInet4Addr(ip.To4()); err != nil {
+		return err
+	}
+	if err := unix.IoctlIfreq(fd, unix.SIOCSIFADDR, req); err != nil {
+		return err
+	}
+
+	req, err = unix.NewIfreq(name)
+	if err != nil {
+		return err
+	}
+	mask := net.CIDRMask(prefixLen, 32)
+	if err := req.SetInet4Addr([]byte(mask)); err != nil {
+		return err
+	}
+	return unix.IoctlIfreq(fd, unix.SIOCSIFNETMASK, req)
+}
+
+func ioctlLinkUp(name string) error {
+	fd, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_IP)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(fd)
+
+	req, err := unix.NewIfreq(name)
+	if err != nil {
+		return err
+	}
+	if err := unix.IoctlIfreq(fd, unix.SIOCGIFFLAGS, req); err != nil {
+		return err
+	}
+	req.SetUint16(req.Uint16() | unix.IFF_UP | unix.IFF_RUNNING)
+	return unix.IoctlIfreq(fd, unix.SIOCSIFFLAGS, req)
+}
+
+// cstring returns b as a null-terminated byte slice.
+func cstring(s string) []byte {
+	return append([]byte(s), 0)
+}

peer/wginterface/manage.go

@@ -0,0 +1,165 @@
+package wginterface
+
+import (
+	"fmt"
+	"net"
+	"net/netip"
+	"os"
+	"time"
+
+	"golang.zx2c4.com/wireguard/wgctrl"
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+)
+
+const (
+	// RekeyTimeout is the WireGuard session lifetime before a new handshake
+	// is initiated. Sessions older than this but younger than SessionTimeout
+	// remain valid.
+	RekeyTimeout = 120 * time.Second
+
+	// SessionTimeout is the WireGuard session lifetime after which sessions
+	// are rejected. A peer with LastHandshakeTime older than this is
+	// effectively disconnected.
+	SessionTimeout = 180 * time.Second
+)
+
+var (
+	probeKeepalive = 5 * time.Second
+	zeroKeepalive  = time.Duration(0)
+)
+
+// Device wraps a wgctrl client bound to a named WireGuard interface.
+type Device struct {
+	client *wgctrl.Client
+	name   string
+}
+
+// Open attaches to an existing WireGuard interface.
+func Open(name string) (*Device, error) {
+	client, err := wgctrl.New()
+	if err != nil {
+		return nil, fmt.Errorf("wgctrl: %w", err)
+	}
+	return &Device{client: client, name: name}, nil
+}
+
+// Close releases the underlying wgctrl client.
+func (d *Device) Close() error {
+	return d.client.Close()
+}
+
+// Configure sets the device's private key and UDP listen port.
+func (d *Device) Configure(privKey wgtypes.Key, listenPort int) error {
+	return d.client.ConfigureDevice(d.name, wgtypes.Config{
+		PrivateKey: &privKey,
+		ListenPort: &listenPort,
+	})
+}
+
+// Peers returns the current state of all peers on the device.
+func (d *Device) Peers() ([]wgtypes.Peer, error) {
+	dev, err := d.client.Device(d.name)
+	if err != nil {
+		return nil, fmt.Errorf("get device %q: %w", d.name, err)
+	}
+	return dev.Peers, nil
+}
+
+// Peer returns the current state of a single peer by public key.
+func (d *Device) Peer(pubKey wgtypes.Key) (wgtypes.Peer, error) {
+	peers, err := d.Peers()
+	if err != nil {
+		return wgtypes.Peer{}, err
+	}
+	for _, p := range peers {
+		if p.PublicKey == pubKey {
+			return p, nil
+		}
+	}
+	return wgtypes.Peer{}, fmt.Errorf("peer %v not found in %q", pubKey, d.name)
+}
+
+// SetRelay configures the relay peer with AllowedIPs covering the entire VPN
+// network prefix. This is the fallback route for all VPN traffic.
+func (d *Device) SetRelay(pubKey wgtypes.Key, endpoint netip.AddrPort, network netip.Prefix) error {
+	masked := network.Masked()
+	a4 := masked.Addr().As4()
+	return d.client.ConfigureDevice(d.name, wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{{
+			PublicKey: pubKey,
+			Endpoint:  net.UDPAddrFromAddrPort(endpoint),
+			AllowedIPs: []net.IPNet{{
+				IP:   net.IP(a4[:]),
+				Mask: net.CIDRMask(masked.Bits(), 32),
+			}},
+			ReplaceAllowedIPs: true,
+		}},
+	})
+}
+
+// AddProbe adds a peer with no AllowedIPs and a 5s keepalive. WireGuard will
+// attempt handshakes without routing any traffic through this peer yet.
+func (d *Device) AddProbe(pubKey wgtypes.Key, endpoint netip.AddrPort) error {
+	return d.client.ConfigureDevice(d.name, wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{{
+			PublicKey:                   pubKey,
+			Endpoint:                    net.UDPAddrFromAddrPort(endpoint),
+			AllowedIPs:                  []net.IPNet{},
+			ReplaceAllowedIPs:           true,
+			PersistentKeepaliveInterval: &probeKeepalive,
+		}},
+	})
+}
+
+// Promote upgrades a probe entry to a /32 AllowedIPs and removes the probe
+// keepalive, causing WireGuard to prefer this peer's direct path over the
+// relay's wider route.
+func (d *Device) Promote(pubKey wgtypes.Key, vpnIP netip.Addr) error {
+	a4 := vpnIP.As4()
+	return d.client.ConfigureDevice(d.name, wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{{
+			PublicKey: pubKey,
+			AllowedIPs: []net.IPNet{{
+				IP:   net.IP(a4[:]),
+				Mask: net.CIDRMask(32, 32),
+			}},
+			ReplaceAllowedIPs:           true,
+			PersistentKeepaliveInterval: &zeroKeepalive,
+		}},
+	})
+}
+
+// AddDirect adds a peer with a known endpoint and /32 AllowedIPs in one step,
+// for peers with a stable public endpoint reported by the hub.
+func (d *Device) AddDirect(pubKey wgtypes.Key, endpoint netip.AddrPort, vpnIP netip.Addr) error {
+	a4 := vpnIP.As4()
+	return d.client.ConfigureDevice(d.name, wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{{
+			PublicKey: pubKey,
+			Endpoint:  net.UDPAddrFromAddrPort(endpoint),
+			AllowedIPs: []net.IPNet{{
+				IP:   net.IP(a4[:]),
+				Mask: net.CIDRMask(32, 32),
+			}},
+			ReplaceAllowedIPs:           true,
+			PersistentKeepaliveInterval: &zeroKeepalive,
+		}},
+	})
+}
+
+// RemovePeer removes a peer from the device.
+func (d *Device) RemovePeer(pubKey wgtypes.Key) error {
+	return d.client.ConfigureDevice(d.name, wgtypes.Config{
+		Peers: []wgtypes.PeerConfig{{
+			PublicKey: pubKey,
+			Remove:    true,
+		}},
+	})
+}
+
+// EnableForwarding enables IPv4 forwarding on the interface, required for
+// relay peers that forward traffic between VPN peers.
+func (d *Device) EnableForwarding() error {
+	path := fmt.Sprintf("/proc/sys/net/ipv4/conf/%s/forwarding", d.name)
+	return os.WriteFile(path, []byte("1\n"), 0644)
+}

peer/wginterface/manage_test.go

@@ -0,0 +1,303 @@
+//go:build integration
+
+package wginterface_test
+
+import (
+	"fmt"
+	"log"
+	"net"
+	"net/netip"
+	"os"
+	"strings"
+	"testing"
+	"time"
+
+	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
+	"vppn/peer/wginterface"
+)
+
+const (
+	testBasePort = 59100
+)
+
+func TestMain(m *testing.M) {
+	if os.Getuid() != 0 {
+		fmt.Fprintln(os.Stderr, "wginterface integration tests require root; skipping")
+		os.Exit(0)
+	}
+	os.Exit(m.Run())
+}
+
+type testPeer struct {
+	Name    string
+	VpnIP   netip.Addr
+	Port    int
+	PrivKey wgtypes.Key
+	PubKey  wgtypes.Key
+	Dev     *wginterface.Device
+}
+
+func (p *testPeer) Endpoint() netip.AddrPort {
+	return netip.AddrPortFrom(netip.AddrFrom4([4]byte{127, 0, 0, 1}), uint16(p.Port))
+}
+
+func newTestPeer(t *testing.T, name string, vpnIP netip.Addr, port int) *testPeer {
+	t.Helper()
+
+	privKey, err := wgtypes.GenerateKey()
+	if err != nil {
+		t.Fatalf("generate key: %v", err)
+	}
+
+	a4 := vpnIP.As4()
+	if err := wginterface.Create(name, net.IP(a4[:]), 24); err != nil {
+		t.Fatalf("create %s: %v", name, err)
+	}
+	t.Cleanup(func() {
+		if err := wginterface.Delete(name); err != nil {
+			log.Printf("Failed to delete interface %s: %v", name, err)
+		}
+	})
+
+	dev, err := wginterface.Open(name)
+	if err != nil {
+		t.Fatalf("open %s: %v", name, err)
+	}
+	t.Cleanup(func() { dev.Close() })
+
+	if err := dev.Configure(privKey, port); err != nil {
+		t.Fatalf("configure %s: %v", name, err)
+	}
+
+	return &testPeer{
+		Name:    name,
+		VpnIP:   vpnIP,
+		Port:    port,
+		PrivKey: privKey,
+		PubKey:  privKey.PublicKey(),
+		Dev:     dev,
+	}
+}
+
+// waitHandshake polls until the named peer has completed a handshake or the timeout elapses.
+func waitHandshake(t *testing.T, dev *wginterface.Device, pubKey wgtypes.Key, timeout time.Duration) {
+	t.Helper()
+	deadline := time.Now().Add(timeout)
+	for time.Now().Before(deadline) {
+		p, err := dev.Peer(pubKey)
+		if err != nil {
+			t.Fatalf("peer lookup: %v", err)
+		}
+		if !p.LastHandshakeTime.IsZero() {
+			return
+		}
+		time.Sleep(200 * time.Millisecond)
+	}
+	t.Fatalf("no handshake within %v", timeout)
+}
+
+func TestDirectHandshake(t *testing.T) {
+	p1 := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+	p2 := newTestPeer(t, "wgtest1", netip.MustParseAddr("192.168.99.2"), testBasePort+1)
+
+	if err := p1.Dev.AddDirect(p2.PubKey, p2.Endpoint(), p2.VpnIP); err != nil {
+		t.Fatalf("p1 AddDirect: %v", err)
+	}
+	if err := p2.Dev.AddDirect(p1.PubKey, p1.Endpoint(), p1.VpnIP); err != nil {
+		t.Fatalf("p2 AddDirect: %v", err)
+	}
+
+	waitHandshake(t, p1.Dev, p2.PubKey, 30*time.Second)
+	waitHandshake(t, p2.Dev, p1.PubKey, 30*time.Second)
+}
+
+func TestProbeAndPromote(t *testing.T) {
+	p1 := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+	p2 := newTestPeer(t, "wgtest1", netip.MustParseAddr("192.168.99.2"), testBasePort+1)
+
+	// p2 needs a peer entry for p1 so it can respond to the handshake initiation.
+	if err := p2.Dev.AddDirect(p1.PubKey, p1.Endpoint(), p1.VpnIP); err != nil {
+		t.Fatalf("p2 AddDirect: %v", err)
+	}
+
+	if err := p1.Dev.AddProbe(p2.PubKey, p2.Endpoint()); err != nil {
+		t.Fatalf("AddProbe: %v", err)
+	}
+	waitHandshake(t, p1.Dev, p2.PubKey, 30*time.Second)
+
+	if err := p1.Dev.Promote(p2.PubKey, p2.VpnIP); err != nil {
+		t.Fatalf("Promote: %v", err)
+	}
+
+	peer, err := p1.Dev.Peer(p2.PubKey)
+	if err != nil {
+		t.Fatalf("Peer: %v", err)
+	}
+	checkAllowedIP(t, peer, p2.VpnIP, 32)
+}
+
+func TestRelayHandshakes(t *testing.T) {
+	vpnNetwork := netip.MustParsePrefix("192.168.99.0/24")
+
+	relay := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+	peer1 := newTestPeer(t, "wgtest1", netip.MustParseAddr("192.168.99.2"), testBasePort+1)
+	peer2 := newTestPeer(t, "wgtest2", netip.MustParseAddr("192.168.99.3"), testBasePort+2)
+
+	if err := relay.Dev.AddDirect(peer1.PubKey, peer1.Endpoint(), peer1.VpnIP); err != nil {
+		t.Fatalf("relay AddDirect peer1: %v", err)
+	}
+	if err := relay.Dev.AddDirect(peer2.PubKey, peer2.Endpoint(), peer2.VpnIP); err != nil {
+		t.Fatalf("relay AddDirect peer2: %v", err)
+	}
+	if err := peer1.Dev.SetRelay(relay.PubKey, relay.Endpoint(), vpnNetwork); err != nil {
+		t.Fatalf("peer1 SetRelay: %v", err)
+	}
+	if err := peer2.Dev.SetRelay(relay.PubKey, relay.Endpoint(), vpnNetwork); err != nil {
+		t.Fatalf("peer2 SetRelay: %v", err)
+	}
+
+	waitHandshake(t, relay.Dev, peer1.PubKey, 30*time.Second)
+	waitHandshake(t, relay.Dev, peer2.PubKey, 30*time.Second)
+	waitHandshake(t, peer1.Dev, relay.PubKey, 30*time.Second)
+	waitHandshake(t, peer2.Dev, relay.PubKey, 30*time.Second)
+
+	// relay has /32 entries for each peer
+	p, err := relay.Dev.Peer(peer1.PubKey)
+	if err != nil {
+		t.Fatalf("relay peer1: %v", err)
+	}
+	checkAllowedIP(t, p, peer1.VpnIP, 32)
+
+	p, err = relay.Dev.Peer(peer2.PubKey)
+	if err != nil {
+		t.Fatalf("relay peer2: %v", err)
+	}
+	checkAllowedIP(t, p, peer2.VpnIP, 32)
+
+	// peers have /24 fallback route via relay
+	p, err = peer1.Dev.Peer(relay.PubKey)
+	if err != nil {
+		t.Fatalf("peer1 relay: %v", err)
+	}
+	checkAllowedIP(t, p, vpnNetwork.Masked().Addr(), 24)
+
+	p, err = peer2.Dev.Peer(relay.PubKey)
+	if err != nil {
+		t.Fatalf("peer2 relay: %v", err)
+	}
+	checkAllowedIP(t, p, vpnNetwork.Masked().Addr(), 24)
+}
+
+func TestRemovePeer(t *testing.T) {
+	p1 := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+	p2 := newTestPeer(t, "wgtest1", netip.MustParseAddr("192.168.99.2"), testBasePort+1)
+
+	if err := p1.Dev.AddDirect(p2.PubKey, p2.Endpoint(), p2.VpnIP); err != nil {
+		t.Fatalf("AddDirect: %v", err)
+	}
+	if err := p2.Dev.AddDirect(p1.PubKey, p1.Endpoint(), p1.VpnIP); err != nil {
+		t.Fatalf("AddDirect: %v", err)
+	}
+	waitHandshake(t, p1.Dev, p2.PubKey, 30*time.Second)
+
+	if err := p1.Dev.RemovePeer(p2.PubKey); err != nil {
+		t.Fatalf("RemovePeer: %v", err)
+	}
+	if _, err := p1.Dev.Peer(p2.PubKey); err == nil {
+		t.Fatal("expected error after RemovePeer, got nil")
+	}
+}
+
+func TestEnableForwarding(t *testing.T) {
+	p := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+
+	if err := p.Dev.EnableForwarding(); err != nil {
+		t.Fatalf("EnableForwarding: %v", err)
+	}
+
+	data, err := os.ReadFile(fmt.Sprintf("/proc/sys/net/ipv4/conf/%s/forwarding", p.Name))
+	if err != nil {
+		t.Fatalf("read forwarding: %v", err)
+	}
+	if strings.TrimSpace(string(data)) != "1" {
+		t.Fatalf("expected forwarding=1, got %q", string(data))
+	}
+}
+
+func TestPromoteKeepalive(t *testing.T) {
+	p1 := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+	p2 := newTestPeer(t, "wgtest1", netip.MustParseAddr("192.168.99.2"), testBasePort+1)
+
+	if err := p2.Dev.AddDirect(p1.PubKey, p1.Endpoint(), p1.VpnIP); err != nil {
+		t.Fatalf("p2 AddDirect: %v", err)
+	}
+	if err := p1.Dev.AddProbe(p2.PubKey, p2.Endpoint()); err != nil {
+		t.Fatalf("AddProbe: %v", err)
+	}
+	waitHandshake(t, p1.Dev, p2.PubKey, 30*time.Second)
+
+	if err := p1.Dev.Promote(p2.PubKey, p2.VpnIP); err != nil {
+		t.Fatalf("Promote: %v", err)
+	}
+
+	peer, err := p1.Dev.Peer(p2.PubKey)
+	if err != nil {
+		t.Fatalf("Peer: %v", err)
+	}
+	if peer.PersistentKeepaliveInterval != 0 {
+		t.Fatalf("expected keepalive disabled after promote, got %v", peer.PersistentKeepaliveInterval)
+	}
+}
+
+func TestPeersCount(t *testing.T) {
+	relay := newTestPeer(t, "wgtest0", netip.MustParseAddr("192.168.99.1"), testBasePort)
+	peer1 := newTestPeer(t, "wgtest1", netip.MustParseAddr("192.168.99.2"), testBasePort+1)
+	peer2 := newTestPeer(t, "wgtest2", netip.MustParseAddr("192.168.99.3"), testBasePort+2)
+
+	if err := relay.Dev.AddDirect(peer1.PubKey, peer1.Endpoint(), peer1.VpnIP); err != nil {
+		t.Fatalf("AddDirect peer1: %v", err)
+	}
+	if err := relay.Dev.AddDirect(peer2.PubKey, peer2.Endpoint(), peer2.VpnIP); err != nil {
+		t.Fatalf("AddDirect peer2: %v", err)
+	}
+
+	peers, err := relay.Dev.Peers()
+	if err != nil {
+		t.Fatalf("Peers: %v", err)
+	}
+	if len(peers) != 2 {
+		t.Fatalf("expected 2 peers, got %d", len(peers))
+	}
+
+	if err := relay.Dev.RemovePeer(peer1.PubKey); err != nil {
+		t.Fatalf("RemovePeer: %v", err)
+	}
+
+	peers, err = relay.Dev.Peers()
+	if err != nil {
+		t.Fatalf("Peers after remove: %v", err)
+	}
+	if len(peers) != 1 {
+		t.Fatalf("expected 1 peer after remove, got %d", len(peers))
+	}
+	if peers[0].PublicKey != peer2.PubKey {
+		t.Fatal("wrong peer remained after remove")
+	}
+}
+
+// checkAllowedIP asserts that a peer has exactly one AllowedIP matching addr/bits.
+func checkAllowedIP(t *testing.T, p wgtypes.Peer, addr netip.Addr, bits int) {
+	t.Helper()
+	if len(p.AllowedIPs) != 1 {
+		t.Fatalf("expected 1 AllowedIP, got %d", len(p.AllowedIPs))
+	}
+	ones, _ := p.AllowedIPs[0].Mask.Size()
+	if ones != bits {
+		t.Fatalf("expected /%d, got /%d", bits, ones)
+	}
+	got := netip.AddrFrom4([4]byte(p.AllowedIPs[0].IP.To4()))
+	if got != addr {
+		t.Fatalf("expected AllowedIP %v, got %v", addr, got)
+	}
+}

stage1/README.md

@@ -1 +0,0 @@
-## Stage1: Point-to-point Tunnel w/ no Encryption

stage1/client.go

@@ -1,32 +0,0 @@
-package stage1
-
-import (
-	"fmt"
-	"net"
-	"net/netip"
-	"runtime/debug"
-)
-
-func RunClient(serverAddrStr string) {
-	defer func() {
-		if r := recover(); r != nil {
-			fmt.Printf("%v", r)
-			debug.PrintStack()
-		}
-	}()
-
-	iface, err := openInterface(network, clientIP, netName)
-	must(err)
-
-	myAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", port))
-	must(err)
-
-	conn, err := net.ListenUDP("udp", myAddr)
-	must(err)
-
-	serverAddr, err := netip.ParseAddrPort(fmt.Sprintf("%s:%d", serverAddrStr, port))
-	must(err)
-
-	go readFromIFace(iface, conn, serverIP, serverAddr)
-	readFromConn(iface, conn)
-}

stage1/cmd/client/build.sh

@@ -1,7 +0,0 @@
-#!/bin/bash
-
-go build
-
-scp client kevin:/home/jdl/tmp
-ssh root@home "setcap cap_net_admin+iep /home/jdl/tmp/client"
-ssh home "/home/jdl/tmp/client 192.168.1.21"

stage1/cmd/client/main.go

@@ -1,14 +0,0 @@
-package main
-
-import (
-	"log"
-	"os"
-	"vppn/stage1"
-)
-
-func main() {
-	if len(os.Args) != 2 {
-		log.Fatalf("Usage: %s <addr:port>", os.Args[0])
-	}
-	stage1.RunClient(os.Args[1])
-}

stage1/cmd/server/build.sh

@@ -1,4 +0,0 @@
-#!/bin/bash
-
-go build
-sudo setcap cap_net_admin+iep server

stage1/cmd/server/main.go

@@ -1,14 +0,0 @@
-package main
-
-import (
-	"log"
-	"os"
-	"vppn/stage1"
-)
-
-func main() {
-	if len(os.Args) != 2 {
-		log.Fatalf("Usage: %s <addr>", os.Args[0])
-	}
-	stage1.RunServer(os.Args[1])
-}

stage1/interface.go

@@ -1,142 +0,0 @@
-package stage1
-
-import (
-	"fmt"
-	"io"
-	"net"
-	"os"
-	"syscall"
-
-	"golang.org/x/sys/unix"
-)
-
-const (
-	if_mtu       = 1200
-	if_queue_len = 1000
-)
-
-func openInterface(network []byte, localIP byte, name string) (io.ReadWriteCloser, error) {
-	if len(network) != 4 {
-		return nil, fmt.Errorf("expected network to be 4 bytes, got %d", len(network))
-	}
-	ip := net.IPv4(network[0], network[1], network[2], localIP)
-
-	//////////////////////////
-	// Create TUN Interface //
-	//////////////////////////
-
-	tunFD, err := syscall.Open("/dev/net/tun", syscall.O_RDWR|unix.O_CLOEXEC, 0600)
-	if err != nil {
-		return nil, fmt.Errorf("failed to open TUN device: %w", err)
-	}
-
-	// New interface request.
-	req, err := unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create new TUN interface request: %w", err)
-	}
-
-	// Flags:
-	//
-	// IFF_NO_PI => don't add packet info data to packets sent to the interface.
-	// IFF_TUN   => create a TUN device handling IP packets.
-	req.SetUint16(unix.IFF_NO_PI | unix.IFF_TUN)
-
-	err = unix.IoctlIfreq(tunFD, unix.TUNSETIFF, req)
-	if err != nil {
-		return nil, fmt.Errorf("failed to set TUN device settings: %w", err)
-	}
-
-	// Name may not be exactly the same?
-	name = req.Name()
-
-	/////////////
-	// Set MTU //
-	/////////////
-
-	// We need a socket file descriptor to set other options for some reason.
-	sockFD, err := unix.Socket(unix.AF_INET, unix.SOCK_DGRAM, unix.IPPROTO_IP)
-	if err != nil {
-		return nil, fmt.Errorf("failed to open socket: %w", err)
-	}
-	defer unix.Close(sockFD)
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create MTU interface request: %w", err)
-	}
-
-	req.SetUint32(if_mtu)
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFMTU, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface MTU: %w", err)
-	}
-
-	//////////////////////
-	// Set Queue Length //
-	//////////////////////
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create IP interface request: %w", err)
-	}
-
-	req.SetUint16(if_queue_len)
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFTXQLEN, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface queue length: %w", err)
-	}
-
-	/////////////////////
-	// Set IP and Mask //
-	/////////////////////
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create IP interface request: %w", err)
-	}
-
-	if err := req.SetInet4Addr(ip.To4()); err != nil {
-		return nil, fmt.Errorf("failed to set interface request IP: %w", err)
-	}
-
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFADDR, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface IP: %w", err)
-	}
-
-	// SET MASK - must happen after setting address.
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create mask interface request: %w", err)
-	}
-
-	if err := req.SetInet4Addr(net.IPv4(255, 255, 255, 0).To4()); err != nil {
-		return nil, fmt.Errorf("failed to set interface request mask: %w", err)
-	}
-
-	if err := unix.IoctlIfreq(sockFD, unix.SIOCSIFNETMASK, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface mask: %w", err)
-	}
-
-	////////////////////////
-	// Bring Interface Up //
-	////////////////////////
-
-	req, err = unix.NewIfreq(name)
-	if err != nil {
-		return nil, fmt.Errorf("failed to create up interface request: %w", err)
-	}
-
-	// Get current flags.
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCGIFFLAGS, req); err != nil {
-		return nil, fmt.Errorf("failed to get interface flags: %w", err)
-	}
-
-	flags := req.Uint16() | unix.IFF_UP | unix.IFF_RUNNING
-
-	// Set UP flag / broadcast flags.
-	req.SetUint16(flags)
-	if err = unix.IoctlIfreq(sockFD, unix.SIOCSIFFLAGS, req); err != nil {
-		return nil, fmt.Errorf("failed to set interface up: %w", err)
-	}
-
-	return os.NewFile(uintptr(tunFD), "tun"), nil
-}

stage1/server.go

@@ -1,109 +0,0 @@
-package stage1
-
-import (
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"net/netip"
-	"runtime/debug"
-)
-
-var (
-	network    = []byte{10, 1, 1, 0}
-	serverIP   = byte(1)
-	clientIP   = byte(2)
-	port       = uint16(5151)
-	netName    = "testnet"
-	bufferSize = if_mtu * 2
-)
-
-func must(err error) {
-	if err != nil {
-		panic(err)
-	}
-}
-
-func RunServer(clientAddrStr string) {
-	defer func() {
-		if r := recover(); r != nil {
-			fmt.Printf("%v", r)
-			debug.PrintStack()
-		}
-	}()
-
-	iface, err := openInterface(network, serverIP, netName)
-	must(err)
-
-	myAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", port))
-	must(err)
-
-	conn, err := net.ListenUDP("udp", myAddr)
-	must(err)
-
-	clientAddr, err := netip.ParseAddrPort(fmt.Sprintf("%s:%d", clientAddrStr, port))
-	must(err)
-
-	go readFromIFace(iface, conn, clientIP, clientAddr)
-	readFromConn(iface, conn)
-}
-
-func readFromIFace(iface io.ReadWriteCloser, conn *net.UDPConn, remoteIP byte, remoteAddr netip.AddrPort) {
-	var (
-		n       int
-		packet  = make([]byte, bufferSize)
-		version byte
-		ip      byte
-		err     error
-	)
-
-	for {
-		n, err = iface.Read(packet[:bufferSize])
-		must(err)
-		packet = packet[:n]
-
-		if len(packet) < 20 {
-			log.Printf("Dropping small packet: %d", n)
-			continue
-		}
-
-		packet = packet[:n]
-		version = packet[0] >> 4
-
-		switch version {
-		case 4:
-			ip = packet[19]
-		case 6:
-			ip = packet[39]
-		default:
-			log.Printf("Dropping packet with IP version: %d", version)
-			continue
-		}
-
-		if ip != remoteIP {
-			log.Printf("Dropping packet for incorrect IP: %d", ip)
-			continue
-		}
-
-		_, err = conn.WriteToUDPAddrPort(packet, remoteAddr)
-		must(err)
-	}
-}
-
-func readFromConn(iface io.ReadWriteCloser, conn *net.UDPConn) {
-	var (
-		n      int
-		packet = make([]byte, bufferSize)
-		err    error
-	)
-
-	for {
-		// We assume that we're only receiving packets from one source.
-		n, err = conn.Read(packet[:bufferSize])
-		must(err)
-
-		packet = packet[:n]
-		_, err = iface.Write(packet)
-		must(err)
-	}
-}

stage1/startup.go

@@ -1 +0,0 @@
-package stage1

stage2/README.md

@@ -1,4 +0,0 @@
-## Stage2:
-
-* Point-to-point Tunnel w/ no Encryption
-* Server gets client's addr from first packet

stage2/client.go

@@ -1,35 +0,0 @@
-package stage2
-
-import (
-	"fmt"
-	"net"
-	"net/netip"
-	"runtime/debug"
-)
-
-func RunClient(serverAddrStr string) {
-	defer func() {
-		if r := recover(); r != nil {
-			fmt.Printf("%v", r)
-			debug.PrintStack()
-		}
-	}()
-
-	iface, err := openInterface(network, clientIP, netName)
-	must(err)
-
-	myAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf(":%d", port))
-	must(err)
-
-	conn, err := net.ListenUDP("udp", myAddr)
-	must(err)
-
-	serverAddr, err := netip.ParseAddrPort(fmt.Sprintf("%s:%d", serverAddrStr, port))
-	must(err)
-
-	_, err = conn.WriteToUDPAddrPort([]byte{1, 2, 3, 4, 5, 6, 7, 8}, serverAddr)
-	must(err)
-
-	go readFromIFace(iface, conn, serverIP, serverAddr)
-	readFromConn(iface, conn)
-}