mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-12-23 22:19:49 +00:00
295 lines
8.0 KiB
Go
295 lines
8.0 KiB
Go
package internet
|
|
|
|
import (
|
|
"context"
|
|
"syscall"
|
|
"time"
|
|
|
|
"github.com/xtls/xray-core/common"
|
|
"github.com/xtls/xray-core/common/dice"
|
|
"github.com/xtls/xray-core/common/net"
|
|
"github.com/xtls/xray-core/common/net/cnc"
|
|
"github.com/xtls/xray-core/common/session"
|
|
"github.com/xtls/xray-core/features/dns"
|
|
"github.com/xtls/xray-core/features/outbound"
|
|
"github.com/xtls/xray-core/transport"
|
|
"github.com/xtls/xray-core/transport/pipe"
|
|
)
|
|
|
|
var (
|
|
effectiveSystemDialer SystemDialer = &DefaultSystemDialer{}
|
|
)
|
|
|
|
// InitSystemDialer: It's private method and you are NOT supposed to use this function.
|
|
func InitSystemDialer(dc dns.Client, om outbound.Manager) {
|
|
effectiveSystemDialer.Init(dc, om)
|
|
}
|
|
|
|
type SystemDialer interface {
|
|
Dial(ctx context.Context, source net.Address, destination net.Destination, sockopt *SocketConfig) (net.Conn, error)
|
|
Init(dc dns.Client, om outbound.Manager)
|
|
}
|
|
|
|
type DefaultSystemDialer struct {
|
|
controllers []controller
|
|
dns dns.Client
|
|
obm outbound.Manager
|
|
}
|
|
|
|
func resolveSrcAddr(network net.Network, src net.Address) net.Addr {
|
|
if src == nil || src == net.AnyIP {
|
|
return nil
|
|
}
|
|
|
|
if network == net.Network_TCP {
|
|
return &net.TCPAddr{
|
|
IP: src.IP(),
|
|
Port: 0,
|
|
}
|
|
}
|
|
|
|
return &net.UDPAddr{
|
|
IP: src.IP(),
|
|
Port: 0,
|
|
}
|
|
}
|
|
|
|
func hasBindAddr(sockopt *SocketConfig) bool {
|
|
return sockopt != nil && len(sockopt.BindAddress) > 0 && sockopt.BindPort > 0
|
|
}
|
|
|
|
func (d *DefaultSystemDialer) lookupIP(domain string, strategy DomainStrategy, localAddr net.Address) ([]net.IP, error) {
|
|
if d.dns == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
var option = dns.IPOption{
|
|
IPv4Enable: true,
|
|
IPv6Enable: true,
|
|
FakeEnable: false,
|
|
}
|
|
|
|
switch {
|
|
case strategy == DomainStrategy_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()):
|
|
option = dns.IPOption{
|
|
IPv4Enable: true,
|
|
IPv6Enable: false,
|
|
FakeEnable: false,
|
|
}
|
|
case strategy == DomainStrategy_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()):
|
|
option = dns.IPOption{
|
|
IPv4Enable: false,
|
|
IPv6Enable: true,
|
|
FakeEnable: false,
|
|
}
|
|
case strategy == DomainStrategy_AS_IS:
|
|
return nil, nil
|
|
}
|
|
|
|
return d.dns.LookupIP(domain, option)
|
|
}
|
|
|
|
func (d *DefaultSystemDialer) canLookupIP(ctx context.Context, dst net.Destination, sockopt *SocketConfig) bool {
|
|
if sockopt == nil || dst.Address.Family().IsIP() || d.dns == nil {
|
|
return false
|
|
}
|
|
if dst.Address.Domain() == LookupDomainFromContext(ctx) {
|
|
newError("infinite loop detected").AtError().WriteToLog(session.ExportIDToError(ctx))
|
|
return false
|
|
}
|
|
return sockopt.DomainStrategy != DomainStrategy_AS_IS
|
|
}
|
|
|
|
func (d *DefaultSystemDialer) redirect(ctx context.Context, dst net.Destination, obt string) net.Conn {
|
|
newError("redirecting request " + dst.String() + " to " + obt).WriteToLog(session.ExportIDToError(ctx))
|
|
h := d.obm.GetHandler(obt)
|
|
ctx = session.ContextWithOutbound(ctx, &session.Outbound{dst, nil})
|
|
if h != nil {
|
|
ur, uw := pipe.New(pipe.OptionsFromContext(ctx)...)
|
|
dr, dw := pipe.New(pipe.OptionsFromContext(ctx)...)
|
|
|
|
go h.Dispatch(ctx, &transport.Link{ur, dw})
|
|
nc := cnc.NewConnection(
|
|
cnc.ConnectionInputMulti(uw),
|
|
cnc.ConnectionOutputMulti(dr),
|
|
cnc.ConnectionOnClose(common.ChainedClosable{uw, dw}),
|
|
)
|
|
return nc
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest net.Destination, sockopt *SocketConfig) (net.Conn, error) {
|
|
newError("dialing to " + dest.String()).AtDebug().WriteToLog()
|
|
if d.obm != nil && sockopt != nil && len(sockopt.DialerProxy) > 0 {
|
|
nc := d.redirect(ctx, dest, sockopt.DialerProxy)
|
|
if nc != nil {
|
|
return nc, nil
|
|
}
|
|
}
|
|
|
|
if d.canLookupIP(ctx, dest, sockopt) {
|
|
ips, err := d.lookupIP(dest.Address.String(), sockopt.DomainStrategy, src)
|
|
if err == nil && len(ips) > 0 {
|
|
dest.Address = net.IPAddress(ips[dice.Roll(len(ips))])
|
|
newError("replace destination with " + dest.String()).AtInfo().WriteToLog()
|
|
} else if err != nil {
|
|
newError("failed to resolve ip").Base(err).AtWarning().WriteToLog()
|
|
}
|
|
}
|
|
|
|
if dest.Network == net.Network_UDP && !hasBindAddr(sockopt) {
|
|
srcAddr := resolveSrcAddr(net.Network_UDP, src)
|
|
if srcAddr == nil {
|
|
srcAddr = &net.UDPAddr{
|
|
IP: []byte{0, 0, 0, 0},
|
|
Port: 0,
|
|
}
|
|
}
|
|
packetConn, err := ListenSystemPacket(ctx, srcAddr, sockopt)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
destAddr, err := net.ResolveUDPAddr("udp", dest.NetAddr())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &PacketConnWrapper{
|
|
conn: packetConn,
|
|
dest: destAddr,
|
|
}, nil
|
|
}
|
|
|
|
dialer := &net.Dialer{
|
|
Timeout: time.Second * 16,
|
|
DualStack: true,
|
|
LocalAddr: resolveSrcAddr(dest.Network, src),
|
|
}
|
|
|
|
if sockopt != nil || len(d.controllers) > 0 {
|
|
dialer.Control = func(network, address string, c syscall.RawConn) error {
|
|
return c.Control(func(fd uintptr) {
|
|
if sockopt != nil {
|
|
if err := applyOutboundSocketOptions(network, address, fd, sockopt); err != nil {
|
|
newError("failed to apply socket options").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
if dest.Network == net.Network_UDP && hasBindAddr(sockopt) {
|
|
if err := bindAddr(fd, sockopt.BindAddress, sockopt.BindPort); err != nil {
|
|
newError("failed to bind source address to ", sockopt.BindAddress).Base(err).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
}
|
|
}
|
|
|
|
for _, ctl := range d.controllers {
|
|
if err := ctl(network, address, fd); err != nil {
|
|
newError("failed to apply external controller").Base(err).WriteToLog(session.ExportIDToError(ctx))
|
|
}
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
return dialer.DialContext(ctx, dest.Network.SystemString(), dest.NetAddr())
|
|
}
|
|
|
|
func (d *DefaultSystemDialer) Init(dc dns.Client, om outbound.Manager) {
|
|
d.dns = dc
|
|
d.obm = om
|
|
}
|
|
|
|
type PacketConnWrapper struct {
|
|
conn net.PacketConn
|
|
dest net.Addr
|
|
}
|
|
|
|
func (c *PacketConnWrapper) Close() error {
|
|
return c.conn.Close()
|
|
}
|
|
|
|
func (c *PacketConnWrapper) LocalAddr() net.Addr {
|
|
return c.conn.LocalAddr()
|
|
}
|
|
|
|
func (c *PacketConnWrapper) RemoteAddr() net.Addr {
|
|
return c.dest
|
|
}
|
|
|
|
func (c *PacketConnWrapper) Write(p []byte) (int, error) {
|
|
return c.conn.WriteTo(p, c.dest)
|
|
}
|
|
|
|
func (c *PacketConnWrapper) Read(p []byte) (int, error) {
|
|
n, _, err := c.conn.ReadFrom(p)
|
|
return n, err
|
|
}
|
|
|
|
func (c *PacketConnWrapper) WriteTo(p []byte, d net.Addr) (int, error) {
|
|
return c.conn.WriteTo(p, d)
|
|
}
|
|
|
|
func (c *PacketConnWrapper) ReadFrom(p []byte) (int, net.Addr, error) {
|
|
return c.conn.ReadFrom(p)
|
|
}
|
|
|
|
func (c *PacketConnWrapper) SetDeadline(t time.Time) error {
|
|
return c.conn.SetDeadline(t)
|
|
}
|
|
|
|
func (c *PacketConnWrapper) SetReadDeadline(t time.Time) error {
|
|
return c.conn.SetReadDeadline(t)
|
|
}
|
|
|
|
func (c *PacketConnWrapper) SetWriteDeadline(t time.Time) error {
|
|
return c.conn.SetWriteDeadline(t)
|
|
}
|
|
|
|
type SystemDialerAdapter interface {
|
|
Dial(network string, address string) (net.Conn, error)
|
|
}
|
|
|
|
type SimpleSystemDialer struct {
|
|
adapter SystemDialerAdapter
|
|
}
|
|
|
|
func WithAdapter(dialer SystemDialerAdapter) SystemDialer {
|
|
return &SimpleSystemDialer{
|
|
adapter: dialer,
|
|
}
|
|
}
|
|
|
|
func (v *SimpleSystemDialer) Init(_ dns.Client, _ outbound.Manager) {}
|
|
|
|
func (v *SimpleSystemDialer) Dial(ctx context.Context, src net.Address, dest net.Destination, sockopt *SocketConfig) (net.Conn, error) {
|
|
return v.adapter.Dial(dest.Network.SystemString(), dest.NetAddr())
|
|
}
|
|
|
|
// UseAlternativeSystemDialer replaces the current system dialer with a given one.
|
|
// Caller must ensure there is no race condition.
|
|
//
|
|
// xray:api:stable
|
|
func UseAlternativeSystemDialer(dialer SystemDialer) {
|
|
if dialer == nil {
|
|
effectiveSystemDialer = &DefaultSystemDialer{}
|
|
}
|
|
effectiveSystemDialer = dialer
|
|
}
|
|
|
|
// RegisterDialerController adds a controller to the effective system dialer.
|
|
// The controller can be used to operate on file descriptors before they are put into use.
|
|
// It only works when effective dialer is the default dialer.
|
|
//
|
|
// xray:api:beta
|
|
func RegisterDialerController(ctl func(network, address string, fd uintptr) error) error {
|
|
if ctl == nil {
|
|
return newError("nil listener controller")
|
|
}
|
|
|
|
dialer, ok := effectiveSystemDialer.(*DefaultSystemDialer)
|
|
if !ok {
|
|
return newError("RegisterListenerController not supported in custom dialer")
|
|
}
|
|
|
|
dialer.controllers = append(dialer.controllers, ctl)
|
|
return nil
|
|
}
|