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Feature: use native syscall to bind interface on Linux and macOS

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This commit is contained in:
Dreamacro 2020-10-22 00:11:49 +08:00
parent 2321e9139d
commit 50b3d497f6
6 changed files with 205 additions and 135 deletions
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104
component/dialer/bind.go Normal file
View file

@ -0,0 +1,104 @@
package dialer
import (
"errors"
"net"
)
var (
errPlatformNotSupport = errors.New("unsupport platform")
)
func lookupTCPAddr(ip net.IP, addrs []net.Addr) (*net.TCPAddr, error) {
ipv4 := ip.To4() != nil
for _, elm := range addrs {
addr, ok := elm.(*net.IPNet)
if !ok {
continue
}
addrV4 := addr.IP.To4() != nil
if addrV4 && ipv4 {
return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
} else if !addrV4 && !ipv4 {
return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
}
}
return nil, ErrAddrNotFound
}
func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
ipv4 := ip.To4() != nil
for _, elm := range addrs {
addr, ok := elm.(*net.IPNet)
if !ok {
continue
}
addrV4 := addr.IP.To4() != nil
if addrV4 && ipv4 {
return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
} else if !addrV4 && !ipv4 {
return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
}
}
return nil, ErrAddrNotFound
}
func fallbackBindToDialer(dialer *net.Dialer, network string, ip net.IP, name string) error {
iface, err := net.InterfaceByName(name)
if err != nil {
return err
}
addrs, err := iface.Addrs()
if err != nil {
return err
}
switch network {
case "tcp", "tcp4", "tcp6":
if addr, err := lookupTCPAddr(ip, addrs); err == nil {
dialer.LocalAddr = addr
} else {
return err
}
case "udp", "udp4", "udp6":
if addr, err := lookupUDPAddr(ip, addrs); err == nil {
dialer.LocalAddr = addr
} else {
return err
}
}
return nil
}
func fallbackBindToListenConfig(name string) (string, error) {
iface, err := net.InterfaceByName(name)
if err != nil {
return "", err
}
addrs, err := iface.Addrs()
if err != nil {
return "", err
}
for _, elm := range addrs {
addr, ok := elm.(*net.IPNet)
if !ok || addr.IP.To4() == nil {
continue
}
return net.JoinHostPort(addr.IP.String(), "0"), nil
}
return "", ErrAddrNotFound
}

46
component/dialer/bind_darwin.go Normal file
View file

@ -0,0 +1,46 @@
package dialer
import (
"net"
"syscall"
)
func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return err
}
dialer.Control = func(network, address string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
switch network {
case "tcp4", "udp4":
syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, iface.Index)
case "tcp6", "udp6":
syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_BOUND_IF, iface.Index)
}
})
}
return nil
}
func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return err
}
lc.Control = func(network, address string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
switch network {
case "tcp4", "udp4":
syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, iface.Index)
case "tcp6", "udp6":
syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_BOUND_IF, iface.Index)
}
})
}
return nil
}

26
component/dialer/bind_linux.go Normal file
View file

@ -0,0 +1,26 @@
package dialer
import (
"net"
"syscall"
)
func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
dialer.Control = func(network, address string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
syscall.BindToDevice(int(fd), ifaceName)
})
}
return nil
}
func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
lc.Control = func(network, address string, c syscall.RawConn) error {
return c.Control(func(fd uintptr) {
syscall.BindToDevice(int(fd), ifaceName)
})
}
return nil
}

13
component/dialer/bind_others.go Normal file
View file

@ -0,0 +1,13 @@
// +build !linux,!darwin
package dialer
import "net"
func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
return errNotSupport
}
func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
return errNotSupport
}

26
component/dialer/dialer.go
View file

@ -19,17 +19,6 @@ func Dialer() (*net.Dialer, error) {
return dialer, nil
}
func ListenConfig() (*net.ListenConfig, error) {
cfg := &net.ListenConfig{}
if ListenConfigHook != nil {
if err := ListenConfigHook(cfg); err != nil {
return nil, err
}
}
return cfg, nil
}
func Dial(network, address string) (net.Conn, error) {
return DialContext(context.Background(), network, address)
}
@ -73,19 +62,16 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
}
func ListenPacket(network, address string) (net.PacketConn, error) {
lc, err := ListenConfig()
if err != nil {
return nil, err
}
if ListenPacketHook != nil && address == "" {
ip, err := ListenPacketHook()
cfg := &net.ListenConfig{}
if ListenPacketHook != nil {
var err error
address, err = ListenPacketHook(cfg, address)
if err != nil {
return nil, err
}
address = net.JoinHostPort(ip.String(), "0")
}
return lc.ListenPacket(context.Background(), network, address)
return cfg.ListenPacket(context.Background(), network, address)
}
func dualStackDialContext(ctx context.Context, network, address string) (net.Conn, error) {

125
component/dialer/hook.go
View file

@ -3,20 +3,15 @@ package dialer
import (
"errors"
"net"
"time"
"github.com/Dreamacro/clash/common/singledo"
)
type DialerHookFunc = func(dialer *net.Dialer) error
type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP) error
type ListenConfigHookFunc = func(*net.ListenConfig) error
type ListenPacketHookFunc = func() (net.IP, error)
type ListenPacketHookFunc = func(lc *net.ListenConfig, address string) (string, error)
var (
DialerHook DialerHookFunc
DialHook DialHookFunc
ListenConfigHook ListenConfigHookFunc
ListenPacketHook ListenPacketHookFunc
)
@ -25,124 +20,24 @@ var (
ErrNetworkNotSupport = errors.New("network not support")
)
func lookupTCPAddr(ip net.IP, addrs []net.Addr) (*net.TCPAddr, error) {
ipv4 := ip.To4() != nil
for _, elm := range addrs {
addr, ok := elm.(*net.IPNet)
if !ok {
continue
}
addrV4 := addr.IP.To4() != nil
if addrV4 && ipv4 {
return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
} else if !addrV4 && !ipv4 {
return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
}
}
return nil, ErrAddrNotFound
}
func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
ipv4 := ip.To4() != nil
for _, elm := range addrs {
addr, ok := elm.(*net.IPNet)
if !ok {
continue
}
addrV4 := addr.IP.To4() != nil
if addrV4 && ipv4 {
return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
} else if !addrV4 && !ipv4 {
return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
}
}
return nil, ErrAddrNotFound
}
func ListenPacketWithInterface(name string) ListenPacketHookFunc {
single := singledo.NewSingle(5 * time.Second)
return func() (net.IP, error) {
elm, err, _ := single.Do(func() (interface{}, error) {
iface, err := net.InterfaceByName(name)
if err != nil {
return nil, err
}
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
return addrs, nil
})
if err != nil {
return nil, err
return func(lc *net.ListenConfig, address string) (string, error) {
err := bindIfaceToListenConfig(lc, name)
if err == errPlatformNotSupport {
address, err = fallbackBindToListenConfig(name)
}
addrs := elm.([]net.Addr)
for _, elm := range addrs {
addr, ok := elm.(*net.IPNet)
if !ok || addr.IP.To4() == nil {
continue
}
return addr.IP, nil
}
return nil, ErrAddrNotFound
return address, err
}
}
func DialerWithInterface(name string) DialHookFunc {
single := singledo.NewSingle(5 * time.Second)
return func(dialer *net.Dialer, network string, ip net.IP) error {
elm, err, _ := single.Do(func() (interface{}, error) {
iface, err := net.InterfaceByName(name)
if err != nil {
return nil, err
}
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
return addrs, nil
})
if err != nil {
return err
err := bindIfaceToDialer(dialer, name)
if err == errPlatformNotSupport {
err = fallbackBindToDialer(dialer, network, ip, name)
}
addrs := elm.([]net.Addr)
switch network {
case "tcp", "tcp4", "tcp6":
if addr, err := lookupTCPAddr(ip, addrs); err == nil {
dialer.LocalAddr = addr
} else {
return err
}
case "udp", "udp4", "udp6":
if addr, err := lookupUDPAddr(ip, addrs); err == nil {
dialer.LocalAddr = addr
} else {
return err
}
}
return nil
return err
}
}