sing-box/common/dialer/default.go
2024-05-23 14:57:26 +08:00

184 lines
6.1 KiB
Go

package dialer
import (
"context"
"net"
"time"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/common/conntrack"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing/common/control"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
)
var _ WireGuardListener = (*DefaultDialer)(nil)
type DefaultDialer struct {
dialer4 tcpDialer
dialer6 tcpDialer
udpDialer4 net.Dialer
udpDialer6 net.Dialer
udpListener net.ListenConfig
udpAddr4 string
udpAddr6 string
isWireGuardListener bool
}
func NewDefault(router adapter.Router, options option.DialerOptions) (*DefaultDialer, error) {
var dialer net.Dialer
var listener net.ListenConfig
if options.BindInterface != "" {
var interfaceFinder control.InterfaceFinder
if router != nil {
interfaceFinder = router.InterfaceFinder()
} else {
interfaceFinder = control.NewDefaultInterfaceFinder()
}
bindFunc := control.BindToInterface(interfaceFinder, options.BindInterface, -1)
dialer.Control = control.Append(dialer.Control, bindFunc)
listener.Control = control.Append(listener.Control, bindFunc)
} else if router != nil && router.AutoDetectInterface() {
bindFunc := router.AutoDetectInterfaceFunc()
dialer.Control = control.Append(dialer.Control, bindFunc)
listener.Control = control.Append(listener.Control, bindFunc)
} else if router != nil && router.DefaultInterface() != "" {
bindFunc := control.BindToInterface(router.InterfaceFinder(), router.DefaultInterface(), -1)
dialer.Control = control.Append(dialer.Control, bindFunc)
listener.Control = control.Append(listener.Control, bindFunc)
}
if options.RoutingMark != 0 {
dialer.Control = control.Append(dialer.Control, control.RoutingMark(options.RoutingMark))
listener.Control = control.Append(listener.Control, control.RoutingMark(options.RoutingMark))
} else if router != nil && router.DefaultMark() != 0 {
dialer.Control = control.Append(dialer.Control, control.RoutingMark(router.DefaultMark()))
listener.Control = control.Append(listener.Control, control.RoutingMark(router.DefaultMark()))
}
if options.ReuseAddr {
listener.Control = control.Append(listener.Control, control.ReuseAddr())
}
if options.ProtectPath != "" {
dialer.Control = control.Append(dialer.Control, control.ProtectPath(options.ProtectPath))
listener.Control = control.Append(listener.Control, control.ProtectPath(options.ProtectPath))
}
if options.ConnectTimeout != 0 {
dialer.Timeout = time.Duration(options.ConnectTimeout)
} else {
dialer.Timeout = C.TCPTimeout
}
// TODO: Add an option to customize the keep alive period
dialer.KeepAlive = C.TCPKeepAliveInitial
dialer.Control = control.Append(dialer.Control, control.SetKeepAlivePeriod(C.TCPKeepAliveInitial, C.TCPKeepAliveInterval))
var udpFragment bool
if options.UDPFragment != nil {
udpFragment = *options.UDPFragment
} else {
udpFragment = options.UDPFragmentDefault
}
if !udpFragment {
dialer.Control = control.Append(dialer.Control, control.DisableUDPFragment())
listener.Control = control.Append(listener.Control, control.DisableUDPFragment())
}
var (
dialer4 = dialer
udpDialer4 = dialer
udpAddr4 string
)
if options.Inet4BindAddress != nil {
bindAddr := options.Inet4BindAddress.Build()
dialer4.LocalAddr = &net.TCPAddr{IP: bindAddr.AsSlice()}
udpDialer4.LocalAddr = &net.UDPAddr{IP: bindAddr.AsSlice()}
udpAddr4 = M.SocksaddrFrom(bindAddr, 0).String()
}
var (
dialer6 = dialer
udpDialer6 = dialer
udpAddr6 string
)
if options.Inet6BindAddress != nil {
bindAddr := options.Inet6BindAddress.Build()
dialer6.LocalAddr = &net.TCPAddr{IP: bindAddr.AsSlice()}
udpDialer6.LocalAddr = &net.UDPAddr{IP: bindAddr.AsSlice()}
udpAddr6 = M.SocksaddrFrom(bindAddr, 0).String()
}
if options.TCPMultiPath {
if !go121Available {
return nil, E.New("MultiPath TCP requires go1.21, please recompile your binary.")
}
setMultiPathTCP(&dialer4)
}
if options.IsWireGuardListener {
for _, controlFn := range wgControlFns {
listener.Control = control.Append(listener.Control, controlFn)
}
}
tcpDialer4, err := newTCPDialer(dialer4, options.TCPFastOpen)
if err != nil {
return nil, err
}
tcpDialer6, err := newTCPDialer(dialer6, options.TCPFastOpen)
if err != nil {
return nil, err
}
return &DefaultDialer{
tcpDialer4,
tcpDialer6,
udpDialer4,
udpDialer6,
listener,
udpAddr4,
udpAddr6,
options.IsWireGuardListener,
}, nil
}
func (d *DefaultDialer) DialContext(ctx context.Context, network string, address M.Socksaddr) (net.Conn, error) {
if !address.IsValid() {
return nil, E.New("invalid address")
}
switch N.NetworkName(network) {
case N.NetworkUDP:
if !address.IsIPv6() {
return trackConn(d.udpDialer4.DialContext(ctx, network, address.String()))
} else {
return trackConn(d.udpDialer6.DialContext(ctx, network, address.String()))
}
}
if !address.IsIPv6() {
return trackConn(DialSlowContext(&d.dialer4, ctx, network, address))
} else {
return trackConn(DialSlowContext(&d.dialer6, ctx, network, address))
}
}
func (d *DefaultDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
if destination.IsIPv6() {
return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr6))
} else if destination.IsIPv4() && !destination.Addr.IsUnspecified() {
return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP+"4", d.udpAddr4))
} else {
return trackPacketConn(d.udpListener.ListenPacket(ctx, N.NetworkUDP, d.udpAddr4))
}
}
func (d *DefaultDialer) ListenPacketCompat(network, address string) (net.PacketConn, error) {
return trackPacketConn(d.udpListener.ListenPacket(context.Background(), network, address))
}
func trackConn(conn net.Conn, err error) (net.Conn, error) {
if !conntrack.Enabled || err != nil {
return conn, err
}
return conntrack.NewConn(conn)
}
func trackPacketConn(conn net.PacketConn, err error) (net.PacketConn, error) {
if !conntrack.Enabled || err != nil {
return conn, err
}
return conntrack.NewPacketConn(conn)
}