sing-box/experimental/libbox/monitor.go
2023-08-20 13:30:50 +08:00

181 lines
4.9 KiB
Go

package libbox
import (
"net"
"net/netip"
"sync"
"github.com/sagernet/sing-tun"
"github.com/sagernet/sing/common"
E "github.com/sagernet/sing/common/exceptions"
"github.com/sagernet/sing/common/logger"
M "github.com/sagernet/sing/common/metadata"
"github.com/sagernet/sing/common/x/list"
)
var (
_ tun.DefaultInterfaceMonitor = (*platformDefaultInterfaceMonitor)(nil)
_ InterfaceUpdateListener = (*platformDefaultInterfaceMonitor)(nil)
)
type platformDefaultInterfaceMonitor struct {
*platformInterfaceWrapper
networkAddresses []networkAddress
defaultInterfaceName string
defaultInterfaceIndex int
element *list.Element[tun.NetworkUpdateCallback]
access sync.Mutex
callbacks list.List[tun.DefaultInterfaceUpdateCallback]
logger logger.Logger
}
type networkAddress struct {
interfaceName string
interfaceIndex int
addresses []netip.Prefix
}
func (m *platformDefaultInterfaceMonitor) Start() error {
return m.iif.StartDefaultInterfaceMonitor(m)
}
func (m *platformDefaultInterfaceMonitor) Close() error {
return m.iif.CloseDefaultInterfaceMonitor(m)
}
func (m *platformDefaultInterfaceMonitor) DefaultInterfaceName(destination netip.Addr) string {
for _, address := range m.networkAddresses {
for _, prefix := range address.addresses {
if prefix.Contains(destination) {
return address.interfaceName
}
}
}
return m.defaultInterfaceName
}
func (m *platformDefaultInterfaceMonitor) DefaultInterfaceIndex(destination netip.Addr) int {
for _, address := range m.networkAddresses {
for _, prefix := range address.addresses {
if prefix.Contains(destination) {
return address.interfaceIndex
}
}
}
return m.defaultInterfaceIndex
}
func (m *platformDefaultInterfaceMonitor) OverrideAndroidVPN() bool {
return false
}
func (m *platformDefaultInterfaceMonitor) AndroidVPNEnabled() bool {
return false
}
func (m *platformDefaultInterfaceMonitor) RegisterCallback(callback tun.DefaultInterfaceUpdateCallback) *list.Element[tun.DefaultInterfaceUpdateCallback] {
m.access.Lock()
defer m.access.Unlock()
return m.callbacks.PushBack(callback)
}
func (m *platformDefaultInterfaceMonitor) UnregisterCallback(element *list.Element[tun.DefaultInterfaceUpdateCallback]) {
m.access.Lock()
defer m.access.Unlock()
m.callbacks.Remove(element)
}
func (m *platformDefaultInterfaceMonitor) UpdateDefaultInterface(interfaceName string, interfaceIndex32 int32) {
var err error
if m.iif.UsePlatformInterfaceGetter() {
err = m.updateInterfacesPlatform()
} else {
err = m.updateInterfaces()
}
if err == nil {
err = m.router.UpdateInterfaces()
}
if err != nil {
m.logger.Error(E.Cause(err, "update interfaces"))
}
interfaceIndex := int(interfaceIndex32)
if interfaceName == "" {
for _, netIf := range m.networkAddresses {
if netIf.interfaceIndex == interfaceIndex {
interfaceName = netIf.interfaceName
break
}
}
} else if interfaceIndex == -1 {
for _, netIf := range m.networkAddresses {
if netIf.interfaceName == interfaceName {
interfaceIndex = netIf.interfaceIndex
break
}
}
}
if interfaceName == "" {
m.logger.Error(E.New("invalid interface name for ", interfaceIndex))
return
} else if interfaceIndex == -1 {
m.logger.Error(E.New("invalid interface index for ", interfaceName))
return
}
if m.defaultInterfaceName == interfaceName && m.defaultInterfaceIndex == interfaceIndex {
return
}
m.defaultInterfaceName = interfaceName
m.defaultInterfaceIndex = interfaceIndex
m.access.Lock()
callbacks := m.callbacks.Array()
m.access.Unlock()
for _, callback := range callbacks {
callback(tun.EventInterfaceUpdate)
}
}
func (m *platformDefaultInterfaceMonitor) updateInterfaces() error {
interfaces, err := net.Interfaces()
if err != nil {
return err
}
var addresses []networkAddress
for _, iif := range interfaces {
var netAddresses []net.Addr
netAddresses, err = iif.Addrs()
if err != nil {
return err
}
var address networkAddress
address.interfaceName = iif.Name
address.interfaceIndex = iif.Index
address.addresses = common.Map(common.FilterIsInstance(netAddresses, func(it net.Addr) (*net.IPNet, bool) {
value, loaded := it.(*net.IPNet)
return value, loaded
}), func(it *net.IPNet) netip.Prefix {
bits, _ := it.Mask.Size()
return netip.PrefixFrom(M.AddrFromIP(it.IP), bits)
})
addresses = append(addresses, address)
}
m.networkAddresses = addresses
return nil
}
func (m *platformDefaultInterfaceMonitor) updateInterfacesPlatform() error {
interfaces, err := m.Interfaces()
if err != nil {
return err
}
var addresses []networkAddress
for _, iif := range interfaces {
var address networkAddress
address.interfaceName = iif.Name
address.interfaceIndex = iif.Index
// address.addresses = common.Map(iif.Addresses, netip.MustParsePrefix)
addresses = append(addresses, address)
}
m.networkAddresses = addresses
return nil
}