mirror of
https://github.com/fosrl/olm.git
synced 2026-02-08 05:56:41 +00:00
Owen
725
peers/monitor/monitor.go
Normal file
725
peers/monitor/monitor.go
Normal file
@@ -0,0 +1,725 @@
|
||||
package monitor
|
||||
|
||||
import (
|
||||
"context"
|
||||
"fmt"
|
||||
"net"
|
||||
"net/netip"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/fosrl/newt/bind"
|
||||
"github.com/fosrl/newt/holepunch"
|
||||
"github.com/fosrl/newt/logger"
|
||||
"github.com/fosrl/newt/util"
|
||||
middleDevice "github.com/fosrl/olm/device"
|
||||
"github.com/fosrl/olm/websocket"
|
||||
"gvisor.dev/gvisor/pkg/buffer"
|
||||
"gvisor.dev/gvisor/pkg/tcpip"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/header"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/link/channel"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/network/ipv4"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/network/ipv6"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/stack"
|
||||
"gvisor.dev/gvisor/pkg/tcpip/transport/udp"
|
||||
)
|
||||
|
||||
// PeerMonitorCallback is the function type for connection status change callbacks
|
||||
type PeerMonitorCallback func(siteID int, connected bool, rtt time.Duration)
|
||||
|
||||
// HolepunchStatusCallback is called when holepunch connection status changes
|
||||
type HolepunchStatusCallback func(siteID int, endpoint string, connected bool, rtt time.Duration)
|
||||
|
||||
// PeerMonitor handles monitoring the connection status to multiple WireGuard peers
|
||||
type PeerMonitor struct {
|
||||
monitors map[int]*Client
|
||||
callback PeerMonitorCallback
|
||||
mutex sync.Mutex
|
||||
running bool
|
||||
interval time.Duration
|
||||
timeout time.Duration
|
||||
maxAttempts int
|
||||
wsClient *websocket.Client
|
||||
|
||||
// Netstack fields
|
||||
middleDev *middleDevice.MiddleDevice
|
||||
localIP string
|
||||
stack *stack.Stack
|
||||
ep *channel.Endpoint
|
||||
activePorts map[uint16]bool
|
||||
portsLock sync.Mutex
|
||||
nsCtx context.Context
|
||||
nsCancel context.CancelFunc
|
||||
nsWg sync.WaitGroup
|
||||
|
||||
// Holepunch testing fields
|
||||
sharedBind *bind.SharedBind
|
||||
holepunchTester *holepunch.HolepunchTester
|
||||
holepunchInterval time.Duration
|
||||
holepunchTimeout time.Duration
|
||||
holepunchEndpoints map[int]string // siteID -> endpoint for holepunch testing
|
||||
holepunchStatus map[int]bool // siteID -> connected status
|
||||
holepunchStatusCallback HolepunchStatusCallback
|
||||
holepunchStopChan chan struct{}
|
||||
}
|
||||
|
||||
// NewPeerMonitor creates a new peer monitor with the given callback
|
||||
func NewPeerMonitor(callback PeerMonitorCallback, wsClient *websocket.Client, middleDev *middleDevice.MiddleDevice, localIP string, sharedBind *bind.SharedBind) *PeerMonitor {
|
||||
ctx, cancel := context.WithCancel(context.Background())
|
||||
pm := &PeerMonitor{
|
||||
monitors: make(map[int]*Client),
|
||||
callback: callback,
|
||||
interval: 1 * time.Second, // Default check interval
|
||||
timeout: 2500 * time.Millisecond,
|
||||
maxAttempts: 15,
|
||||
wsClient: wsClient,
|
||||
middleDev: middleDev,
|
||||
localIP: localIP,
|
||||
activePorts: make(map[uint16]bool),
|
||||
nsCtx: ctx,
|
||||
nsCancel: cancel,
|
||||
sharedBind: sharedBind,
|
||||
holepunchInterval: 5 * time.Second, // Check holepunch every 5 seconds
|
||||
holepunchTimeout: 3 * time.Second,
|
||||
holepunchEndpoints: make(map[int]string),
|
||||
holepunchStatus: make(map[int]bool),
|
||||
}
|
||||
|
||||
if err := pm.initNetstack(); err != nil {
|
||||
logger.Error("Failed to initialize netstack for peer monitor: %v", err)
|
||||
}
|
||||
|
||||
// Initialize holepunch tester if sharedBind is available
|
||||
if sharedBind != nil {
|
||||
pm.holepunchTester = holepunch.NewHolepunchTester(sharedBind)
|
||||
}
|
||||
|
||||
return pm
|
||||
}
|
||||
|
||||
// SetInterval changes how frequently peers are checked
|
||||
func (pm *PeerMonitor) SetInterval(interval time.Duration) {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
pm.interval = interval
|
||||
|
||||
// Update interval for all existing monitors
|
||||
for _, client := range pm.monitors {
|
||||
client.SetPacketInterval(interval)
|
||||
}
|
||||
}
|
||||
|
||||
// SetTimeout changes the timeout for waiting for responses
|
||||
func (pm *PeerMonitor) SetTimeout(timeout time.Duration) {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
pm.timeout = timeout
|
||||
|
||||
// Update timeout for all existing monitors
|
||||
for _, client := range pm.monitors {
|
||||
client.SetTimeout(timeout)
|
||||
}
|
||||
}
|
||||
|
||||
// SetMaxAttempts changes the maximum number of attempts for TestConnection
|
||||
func (pm *PeerMonitor) SetMaxAttempts(attempts int) {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
pm.maxAttempts = attempts
|
||||
|
||||
// Update max attempts for all existing monitors
|
||||
for _, client := range pm.monitors {
|
||||
client.SetMaxAttempts(attempts)
|
||||
}
|
||||
}
|
||||
|
||||
// AddPeer adds a new peer to monitor
|
||||
func (pm *PeerMonitor) AddPeer(siteID int, endpoint string) error {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
if _, exists := pm.monitors[siteID]; exists {
|
||||
return nil // Already monitoring
|
||||
}
|
||||
|
||||
// Use our custom dialer that uses netstack
|
||||
client, err := NewClient(endpoint, pm.dial)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
client.SetPacketInterval(pm.interval)
|
||||
client.SetTimeout(pm.timeout)
|
||||
client.SetMaxAttempts(pm.maxAttempts)
|
||||
|
||||
pm.monitors[siteID] = client
|
||||
pm.holepunchEndpoints[siteID] = endpoint
|
||||
pm.holepunchStatus[siteID] = false // Initially unknown/disconnected
|
||||
|
||||
if pm.running {
|
||||
if err := client.StartMonitor(func(status ConnectionStatus) {
|
||||
pm.handleConnectionStatusChange(siteID, status)
|
||||
}); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// removePeerUnlocked stops monitoring a peer and removes it from the monitor
|
||||
// This function assumes the mutex is already held by the caller
|
||||
func (pm *PeerMonitor) removePeerUnlocked(siteID int) {
|
||||
client, exists := pm.monitors[siteID]
|
||||
if !exists {
|
||||
return
|
||||
}
|
||||
|
||||
client.StopMonitor()
|
||||
client.Close()
|
||||
delete(pm.monitors, siteID)
|
||||
}
|
||||
|
||||
// RemovePeer stops monitoring a peer and removes it from the monitor
|
||||
func (pm *PeerMonitor) RemovePeer(siteID int) {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
pm.removePeerUnlocked(siteID)
|
||||
}
|
||||
|
||||
// Start begins monitoring all peers
|
||||
func (pm *PeerMonitor) Start() {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
if pm.running {
|
||||
return // Already running
|
||||
}
|
||||
|
||||
pm.running = true
|
||||
|
||||
// Start monitoring all peers
|
||||
for siteID, client := range pm.monitors {
|
||||
siteIDCopy := siteID // Create a copy for the closure
|
||||
err := client.StartMonitor(func(status ConnectionStatus) {
|
||||
pm.handleConnectionStatusChange(siteIDCopy, status)
|
||||
})
|
||||
if err != nil {
|
||||
logger.Error("Failed to start monitoring peer %d: %v\n", siteID, err)
|
||||
continue
|
||||
}
|
||||
logger.Info("Started monitoring peer %d\n", siteID)
|
||||
}
|
||||
|
||||
pm.startHolepunchMonitor()
|
||||
}
|
||||
|
||||
// handleConnectionStatusChange is called when a peer's connection status changes
|
||||
func (pm *PeerMonitor) handleConnectionStatusChange(siteID int, status ConnectionStatus) {
|
||||
// Call the user-provided callback first
|
||||
if pm.callback != nil {
|
||||
pm.callback(siteID, status.Connected, status.RTT)
|
||||
}
|
||||
|
||||
// If disconnected, send relay message to the server
|
||||
if !status.Connected {
|
||||
if pm.wsClient != nil {
|
||||
pm.sendRelay(siteID)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// sendRelay sends a relay message to the server
|
||||
func (pm *PeerMonitor) sendRelay(siteID int) error {
|
||||
if pm.wsClient == nil {
|
||||
return fmt.Errorf("websocket client is nil")
|
||||
}
|
||||
|
||||
err := pm.wsClient.SendMessage("olm/wg/relay", map[string]interface{}{
|
||||
"siteId": siteID,
|
||||
})
|
||||
if err != nil {
|
||||
logger.Error("Failed to send registration message: %v", err)
|
||||
return err
|
||||
}
|
||||
logger.Info("Sent relay message")
|
||||
return nil
|
||||
}
|
||||
|
||||
// Stop stops monitoring all peers
|
||||
func (pm *PeerMonitor) Stop() {
|
||||
// Stop holepunch monitor first (outside of mutex to avoid deadlock)
|
||||
pm.stopHolepunchMonitor()
|
||||
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
if !pm.running {
|
||||
return
|
||||
}
|
||||
|
||||
pm.running = false
|
||||
|
||||
// Stop all monitors
|
||||
for _, client := range pm.monitors {
|
||||
client.StopMonitor()
|
||||
}
|
||||
}
|
||||
|
||||
// SetHolepunchStatusCallback sets the callback for holepunch status changes
|
||||
func (pm *PeerMonitor) SetHolepunchStatusCallback(callback HolepunchStatusCallback) {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
pm.holepunchStatusCallback = callback
|
||||
}
|
||||
|
||||
// startHolepunchMonitor starts the holepunch connection monitoring
|
||||
// Note: This function assumes the mutex is already held by the caller (called from Start())
|
||||
func (pm *PeerMonitor) startHolepunchMonitor() error {
|
||||
if pm.holepunchTester == nil {
|
||||
return fmt.Errorf("holepunch tester not initialized (sharedBind not provided)")
|
||||
}
|
||||
|
||||
if pm.holepunchStopChan != nil {
|
||||
return fmt.Errorf("holepunch monitor already running")
|
||||
}
|
||||
|
||||
if err := pm.holepunchTester.Start(); err != nil {
|
||||
return fmt.Errorf("failed to start holepunch tester: %w", err)
|
||||
}
|
||||
|
||||
pm.holepunchStopChan = make(chan struct{})
|
||||
|
||||
go pm.runHolepunchMonitor()
|
||||
|
||||
logger.Info("Started holepunch connection monitor")
|
||||
return nil
|
||||
}
|
||||
|
||||
// stopHolepunchMonitor stops the holepunch connection monitoring
|
||||
func (pm *PeerMonitor) stopHolepunchMonitor() {
|
||||
pm.mutex.Lock()
|
||||
stopChan := pm.holepunchStopChan
|
||||
pm.holepunchStopChan = nil
|
||||
pm.mutex.Unlock()
|
||||
|
||||
if stopChan != nil {
|
||||
close(stopChan)
|
||||
}
|
||||
|
||||
if pm.holepunchTester != nil {
|
||||
pm.holepunchTester.Stop()
|
||||
}
|
||||
|
||||
logger.Info("Stopped holepunch connection monitor")
|
||||
}
|
||||
|
||||
// runHolepunchMonitor runs the holepunch monitoring loop
|
||||
func (pm *PeerMonitor) runHolepunchMonitor() {
|
||||
ticker := time.NewTicker(pm.holepunchInterval)
|
||||
defer ticker.Stop()
|
||||
|
||||
// Do initial check immediately
|
||||
pm.checkHolepunchEndpoints()
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-pm.holepunchStopChan:
|
||||
return
|
||||
case <-ticker.C:
|
||||
pm.checkHolepunchEndpoints()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// checkHolepunchEndpoints tests all holepunch endpoints
|
||||
func (pm *PeerMonitor) checkHolepunchEndpoints() {
|
||||
pm.mutex.Lock()
|
||||
endpoints := make(map[int]string, len(pm.holepunchEndpoints))
|
||||
for siteID, endpoint := range pm.holepunchEndpoints {
|
||||
endpoints[siteID] = endpoint
|
||||
}
|
||||
timeout := pm.holepunchTimeout
|
||||
pm.mutex.Unlock()
|
||||
|
||||
for siteID, endpoint := range endpoints {
|
||||
result := pm.holepunchTester.TestEndpoint(endpoint, timeout)
|
||||
|
||||
pm.mutex.Lock()
|
||||
previousStatus, exists := pm.holepunchStatus[siteID]
|
||||
pm.holepunchStatus[siteID] = result.Success
|
||||
callback := pm.holepunchStatusCallback
|
||||
pm.mutex.Unlock()
|
||||
|
||||
// Log status changes
|
||||
if !exists || previousStatus != result.Success {
|
||||
if result.Success {
|
||||
logger.Info("Holepunch to site %d (%s) is CONNECTED (RTT: %v)", siteID, endpoint, result.RTT)
|
||||
} else {
|
||||
if result.Error != nil {
|
||||
logger.Warn("Holepunch to site %d (%s) is DISCONNECTED: %v", siteID, endpoint, result.Error)
|
||||
} else {
|
||||
logger.Warn("Holepunch to site %d (%s) is DISCONNECTED", siteID, endpoint)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// Call the callback if set
|
||||
if callback != nil {
|
||||
callback(siteID, endpoint, result.Success, result.RTT)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// GetHolepunchStatus returns the current holepunch status for all endpoints
|
||||
func (pm *PeerMonitor) GetHolepunchStatus() map[int]bool {
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
status := make(map[int]bool, len(pm.holepunchStatus))
|
||||
for siteID, connected := range pm.holepunchStatus {
|
||||
status[siteID] = connected
|
||||
}
|
||||
return status
|
||||
}
|
||||
|
||||
// Close stops monitoring and cleans up resources
|
||||
func (pm *PeerMonitor) Close() {
|
||||
// Stop holepunch monitor first (outside of mutex to avoid deadlock)
|
||||
pm.stopHolepunchMonitor()
|
||||
|
||||
pm.mutex.Lock()
|
||||
defer pm.mutex.Unlock()
|
||||
|
||||
logger.Debug("PeerMonitor: Starting cleanup")
|
||||
|
||||
// Stop and close all clients first
|
||||
for siteID, client := range pm.monitors {
|
||||
logger.Debug("PeerMonitor: Stopping client for site %d", siteID)
|
||||
client.StopMonitor()
|
||||
client.Close()
|
||||
delete(pm.monitors, siteID)
|
||||
}
|
||||
|
||||
pm.running = false
|
||||
|
||||
// Clean up netstack resources
|
||||
logger.Debug("PeerMonitor: Cancelling netstack context")
|
||||
if pm.nsCancel != nil {
|
||||
pm.nsCancel() // Signal goroutines to stop
|
||||
}
|
||||
|
||||
// Close the channel endpoint to unblock any pending reads
|
||||
logger.Debug("PeerMonitor: Closing endpoint")
|
||||
if pm.ep != nil {
|
||||
pm.ep.Close()
|
||||
}
|
||||
|
||||
// Wait for packet sender goroutine to finish with timeout
|
||||
logger.Debug("PeerMonitor: Waiting for goroutines to finish")
|
||||
done := make(chan struct{})
|
||||
go func() {
|
||||
pm.nsWg.Wait()
|
||||
close(done)
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-done:
|
||||
logger.Debug("PeerMonitor: Goroutines finished cleanly")
|
||||
case <-time.After(2 * time.Second):
|
||||
logger.Warn("PeerMonitor: Timeout waiting for goroutines to finish, proceeding anyway")
|
||||
}
|
||||
|
||||
// Destroy the stack last, after all goroutines are done
|
||||
logger.Debug("PeerMonitor: Destroying stack")
|
||||
if pm.stack != nil {
|
||||
pm.stack.Destroy()
|
||||
pm.stack = nil
|
||||
}
|
||||
|
||||
logger.Debug("PeerMonitor: Cleanup complete")
|
||||
}
|
||||
|
||||
// TestPeer tests connectivity to a specific peer
|
||||
func (pm *PeerMonitor) TestPeer(siteID int) (bool, time.Duration, error) {
|
||||
pm.mutex.Lock()
|
||||
client, exists := pm.monitors[siteID]
|
||||
pm.mutex.Unlock()
|
||||
|
||||
if !exists {
|
||||
return false, 0, fmt.Errorf("peer with siteID %d not found", siteID)
|
||||
}
|
||||
|
||||
ctx, cancel := context.WithTimeout(context.Background(), pm.timeout*time.Duration(pm.maxAttempts))
|
||||
defer cancel()
|
||||
|
||||
connected, rtt := client.TestConnection(ctx)
|
||||
return connected, rtt, nil
|
||||
}
|
||||
|
||||
// TestAllPeers tests connectivity to all peers
|
||||
func (pm *PeerMonitor) TestAllPeers() map[int]struct {
|
||||
Connected bool
|
||||
RTT time.Duration
|
||||
} {
|
||||
pm.mutex.Lock()
|
||||
peers := make(map[int]*Client, len(pm.monitors))
|
||||
for siteID, client := range pm.monitors {
|
||||
peers[siteID] = client
|
||||
}
|
||||
pm.mutex.Unlock()
|
||||
|
||||
results := make(map[int]struct {
|
||||
Connected bool
|
||||
RTT time.Duration
|
||||
})
|
||||
for siteID, client := range peers {
|
||||
ctx, cancel := context.WithTimeout(context.Background(), pm.timeout*time.Duration(pm.maxAttempts))
|
||||
connected, rtt := client.TestConnection(ctx)
|
||||
cancel()
|
||||
|
||||
results[siteID] = struct {
|
||||
Connected bool
|
||||
RTT time.Duration
|
||||
}{
|
||||
Connected: connected,
|
||||
RTT: rtt,
|
||||
}
|
||||
}
|
||||
|
||||
return results
|
||||
}
|
||||
|
||||
// initNetstack initializes the gvisor netstack
|
||||
func (pm *PeerMonitor) initNetstack() error {
|
||||
if pm.localIP == "" {
|
||||
return fmt.Errorf("local IP not provided")
|
||||
}
|
||||
|
||||
addr, err := netip.ParseAddr(pm.localIP)
|
||||
if err != nil {
|
||||
return fmt.Errorf("invalid local IP: %v", err)
|
||||
}
|
||||
|
||||
// Create gvisor netstack
|
||||
stackOpts := stack.Options{
|
||||
NetworkProtocols: []stack.NetworkProtocolFactory{ipv4.NewProtocol, ipv6.NewProtocol},
|
||||
TransportProtocols: []stack.TransportProtocolFactory{udp.NewProtocol},
|
||||
HandleLocal: true,
|
||||
}
|
||||
|
||||
pm.ep = channel.New(256, 1420, "") // MTU 1420 (standard WG)
|
||||
pm.stack = stack.New(stackOpts)
|
||||
|
||||
// Create NIC
|
||||
if err := pm.stack.CreateNIC(1, pm.ep); err != nil {
|
||||
return fmt.Errorf("failed to create NIC: %v", err)
|
||||
}
|
||||
|
||||
// Add IP address
|
||||
ipBytes := addr.As4()
|
||||
protoAddr := tcpip.ProtocolAddress{
|
||||
Protocol: ipv4.ProtocolNumber,
|
||||
AddressWithPrefix: tcpip.AddrFrom4(ipBytes).WithPrefix(),
|
||||
}
|
||||
|
||||
if err := pm.stack.AddProtocolAddress(1, protoAddr, stack.AddressProperties{}); err != nil {
|
||||
return fmt.Errorf("failed to add protocol address: %v", err)
|
||||
}
|
||||
|
||||
// Add default route
|
||||
pm.stack.AddRoute(tcpip.Route{
|
||||
Destination: header.IPv4EmptySubnet,
|
||||
NIC: 1,
|
||||
})
|
||||
|
||||
// Register filter rule on MiddleDevice
|
||||
// We want to intercept packets destined to our local IP
|
||||
// But ONLY if they are for ports we are listening on
|
||||
pm.middleDev.AddRule(addr, pm.handlePacket)
|
||||
|
||||
// Start packet sender (Stack -> WG)
|
||||
pm.nsWg.Add(1)
|
||||
go pm.runPacketSender()
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
// handlePacket is called by MiddleDevice when a packet arrives for our IP
|
||||
func (pm *PeerMonitor) handlePacket(packet []byte) bool {
|
||||
// Check if it's UDP
|
||||
proto, ok := util.GetProtocol(packet)
|
||||
if !ok || proto != 17 { // UDP
|
||||
return false
|
||||
}
|
||||
|
||||
// Check destination port
|
||||
port, ok := util.GetDestPort(packet)
|
||||
if !ok {
|
||||
return false
|
||||
}
|
||||
|
||||
// Check if we are listening on this port
|
||||
pm.portsLock.Lock()
|
||||
active := pm.activePorts[uint16(port)]
|
||||
pm.portsLock.Unlock()
|
||||
|
||||
if !active {
|
||||
return false
|
||||
}
|
||||
|
||||
// Inject into netstack
|
||||
version := packet[0] >> 4
|
||||
pkb := stack.NewPacketBuffer(stack.PacketBufferOptions{
|
||||
Payload: buffer.MakeWithData(packet),
|
||||
})
|
||||
|
||||
switch version {
|
||||
case 4:
|
||||
pm.ep.InjectInbound(ipv4.ProtocolNumber, pkb)
|
||||
case 6:
|
||||
pm.ep.InjectInbound(ipv6.ProtocolNumber, pkb)
|
||||
default:
|
||||
pkb.DecRef()
|
||||
return false
|
||||
}
|
||||
|
||||
pkb.DecRef()
|
||||
return true // Handled
|
||||
}
|
||||
|
||||
// runPacketSender reads packets from netstack and injects them into WireGuard
|
||||
func (pm *PeerMonitor) runPacketSender() {
|
||||
defer pm.nsWg.Done()
|
||||
logger.Debug("PeerMonitor: Packet sender goroutine started")
|
||||
|
||||
// Use a ticker to periodically check for packets without blocking indefinitely
|
||||
ticker := time.NewTicker(10 * time.Millisecond)
|
||||
defer ticker.Stop()
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-pm.nsCtx.Done():
|
||||
logger.Debug("PeerMonitor: Packet sender context cancelled, draining packets")
|
||||
// Drain any remaining packets before exiting
|
||||
for {
|
||||
pkt := pm.ep.Read()
|
||||
if pkt == nil {
|
||||
break
|
||||
}
|
||||
pkt.DecRef()
|
||||
}
|
||||
logger.Debug("PeerMonitor: Packet sender goroutine exiting")
|
||||
return
|
||||
case <-ticker.C:
|
||||
// Try to read packets in batches
|
||||
for i := 0; i < 10; i++ {
|
||||
pkt := pm.ep.Read()
|
||||
if pkt == nil {
|
||||
break
|
||||
}
|
||||
|
||||
// Extract packet data
|
||||
slices := pkt.AsSlices()
|
||||
if len(slices) > 0 {
|
||||
var totalSize int
|
||||
for _, slice := range slices {
|
||||
totalSize += len(slice)
|
||||
}
|
||||
|
||||
buf := make([]byte, totalSize)
|
||||
pos := 0
|
||||
for _, slice := range slices {
|
||||
copy(buf[pos:], slice)
|
||||
pos += len(slice)
|
||||
}
|
||||
|
||||
// Inject into MiddleDevice (outbound to WG)
|
||||
pm.middleDev.InjectOutbound(buf)
|
||||
}
|
||||
|
||||
pkt.DecRef()
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// dial creates a UDP connection using the netstack
|
||||
func (pm *PeerMonitor) dial(network, addr string) (net.Conn, error) {
|
||||
if pm.stack == nil {
|
||||
return nil, fmt.Errorf("netstack not initialized")
|
||||
}
|
||||
|
||||
// Parse remote address
|
||||
raddr, err := net.ResolveUDPAddr("udp", addr)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Parse local IP
|
||||
localIP, err := netip.ParseAddr(pm.localIP)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ipBytes := localIP.As4()
|
||||
|
||||
// Create UDP connection
|
||||
// We bind to port 0 (ephemeral)
|
||||
laddr := &tcpip.FullAddress{
|
||||
NIC: 1,
|
||||
Addr: tcpip.AddrFrom4(ipBytes),
|
||||
Port: 0,
|
||||
}
|
||||
|
||||
raddrTcpip := &tcpip.FullAddress{
|
||||
NIC: 1,
|
||||
Addr: tcpip.AddrFrom4([4]byte(raddr.IP.To4())),
|
||||
Port: uint16(raddr.Port),
|
||||
}
|
||||
|
||||
conn, err := gonet.DialUDP(pm.stack, laddr, raddrTcpip, ipv4.ProtocolNumber)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Get local port
|
||||
localAddr := conn.LocalAddr().(*net.UDPAddr)
|
||||
port := uint16(localAddr.Port)
|
||||
|
||||
// Register port
|
||||
pm.portsLock.Lock()
|
||||
pm.activePorts[port] = true
|
||||
pm.portsLock.Unlock()
|
||||
|
||||
// Wrap connection to cleanup port on close
|
||||
return &trackedConn{
|
||||
Conn: conn,
|
||||
pm: pm,
|
||||
port: port,
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (pm *PeerMonitor) removePort(port uint16) {
|
||||
pm.portsLock.Lock()
|
||||
delete(pm.activePorts, port)
|
||||
pm.portsLock.Unlock()
|
||||
}
|
||||
|
||||
type trackedConn struct {
|
||||
net.Conn
|
||||
pm *PeerMonitor
|
||||
port uint16
|
||||
}
|
||||
|
||||
func (c *trackedConn) Close() error {
|
||||
c.pm.removePort(c.port)
|
||||
if c.Conn != nil {
|
||||
return c.Conn.Close()
|
||||
}
|
||||
return nil
|
||||
}
|
||||
Reference in New Issue
Block a user