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monitor_shared.go
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monitor_shared.go
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//go:build linux || windows || darwin
package tun
import (
"errors"
"net/netip"
"sync"
"time"
"github.com/sagernet/sing/common/control"
"github.com/sagernet/sing/common/logger"
"github.com/sagernet/sing/common/x/list"
)
func (m *networkUpdateMonitor) RegisterCallback(callback NetworkUpdateCallback) *list.Element[NetworkUpdateCallback] {
m.access.Lock()
defer m.access.Unlock()
return m.callbacks.PushBack(callback)
}
func (m *networkUpdateMonitor) UnregisterCallback(element *list.Element[NetworkUpdateCallback]) {
m.access.Lock()
defer m.access.Unlock()
m.callbacks.Remove(element)
}
func (m *networkUpdateMonitor) emit() {
m.access.Lock()
callbacks := m.callbacks.Array()
m.access.Unlock()
for _, callback := range callbacks {
callback()
}
}
type defaultInterfaceMonitor struct {
interfaceFinder control.InterfaceFinder
overrideAndroidVPN bool
underNetworkExtension bool
defaultInterfaceName string
defaultInterfaceIndex int
androidVPNEnabled bool
noRoute bool
networkMonitor NetworkUpdateMonitor
checkUpdateTimer *time.Timer
element *list.Element[NetworkUpdateCallback]
access sync.Mutex
callbacks list.List[DefaultInterfaceUpdateCallback]
logger logger.Logger
}
func NewDefaultInterfaceMonitor(networkMonitor NetworkUpdateMonitor, logger logger.Logger, options DefaultInterfaceMonitorOptions) (DefaultInterfaceMonitor, error) {
return &defaultInterfaceMonitor{
interfaceFinder: options.InterfaceFinder,
overrideAndroidVPN: options.OverrideAndroidVPN,
underNetworkExtension: options.UnderNetworkExtension,
networkMonitor: networkMonitor,
defaultInterfaceIndex: -1,
logger: logger,
}, nil
}
func (m *defaultInterfaceMonitor) Start() error {
_ = m.checkUpdate()
m.element = m.networkMonitor.RegisterCallback(m.delayCheckUpdate)
return nil
}
func (m *defaultInterfaceMonitor) delayCheckUpdate() {
if m.checkUpdateTimer == nil {
m.checkUpdateTimer = time.AfterFunc(time.Second, m.postCheckUpdate)
} else {
m.checkUpdateTimer.Reset(time.Second)
}
}
func (m *defaultInterfaceMonitor) postCheckUpdate() {
err := m.interfaceFinder.Update()
if err != nil {
m.logger.Error("update interfaces: ", err)
}
err = m.checkUpdate()
if errors.Is(err, ErrNoRoute) {
if !m.noRoute {
m.noRoute = true
m.defaultInterfaceName = ""
m.defaultInterfaceIndex = -1
m.emit(EventNoRoute)
}
} else if err != nil {
m.logger.Error("check interface: ", err)
} else {
m.noRoute = false
}
}
func (m *defaultInterfaceMonitor) Close() error {
if m.element != nil {
m.networkMonitor.UnregisterCallback(m.element)
}
return nil
}
func (m *defaultInterfaceMonitor) DefaultInterfaceName(destination netip.Addr) string {
for _, address := range m.interfaceFinder.Interfaces() {
for _, prefix := range address.Addresses {
if prefix.Contains(destination) {
return address.Name
}
}
}
return m.defaultInterfaceName
}
func (m *defaultInterfaceMonitor) DefaultInterfaceIndex(destination netip.Addr) int {
for _, address := range m.interfaceFinder.Interfaces() {
for _, prefix := range address.Addresses {
if prefix.Contains(destination) {
return address.Index
}
}
}
return m.defaultInterfaceIndex
}
func (m *defaultInterfaceMonitor) DefaultInterface(destination netip.Addr) (string, int) {
for _, address := range m.interfaceFinder.Interfaces() {
for _, prefix := range address.Addresses {
if prefix.Contains(destination) {
return address.Name, address.Index
}
}
}
return m.defaultInterfaceName, m.defaultInterfaceIndex
}
func (m *defaultInterfaceMonitor) OverrideAndroidVPN() bool {
return m.overrideAndroidVPN
}
func (m *defaultInterfaceMonitor) AndroidVPNEnabled() bool {
return m.androidVPNEnabled
}
func (m *defaultInterfaceMonitor) RegisterCallback(callback DefaultInterfaceUpdateCallback) *list.Element[DefaultInterfaceUpdateCallback] {
m.access.Lock()
defer m.access.Unlock()
return m.callbacks.PushBack(callback)
}
func (m *defaultInterfaceMonitor) UnregisterCallback(element *list.Element[DefaultInterfaceUpdateCallback]) {
m.access.Lock()
defer m.access.Unlock()
m.callbacks.Remove(element)
}
func (m *defaultInterfaceMonitor) emit(event int) {
m.access.Lock()
callbacks := m.callbacks.Array()
m.access.Unlock()
for _, callback := range callbacks {
callback(event)
}
}