mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-11-10 02:53:11 +00:00
295 lines
8 KiB
Go
295 lines
8 KiB
Go
package internet
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import (
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"context"
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"syscall"
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"time"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/dice"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/net/cnc"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/features/dns"
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"github.com/xtls/xray-core/features/outbound"
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"github.com/xtls/xray-core/transport"
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"github.com/xtls/xray-core/transport/pipe"
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)
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var (
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effectiveSystemDialer SystemDialer = &DefaultSystemDialer{}
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)
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// InitSystemDialer: It's private method and you are NOT supposed to use this function.
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func InitSystemDialer(dc dns.Client, om outbound.Manager) {
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effectiveSystemDialer.Init(dc, om)
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}
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type SystemDialer interface {
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Dial(ctx context.Context, source net.Address, destination net.Destination, sockopt *SocketConfig) (net.Conn, error)
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Init(dc dns.Client, om outbound.Manager)
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}
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type DefaultSystemDialer struct {
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controllers []controller
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dns dns.Client
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obm outbound.Manager
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}
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func resolveSrcAddr(network net.Network, src net.Address) net.Addr {
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if src == nil || src == net.AnyIP {
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return nil
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}
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if network == net.Network_TCP {
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return &net.TCPAddr{
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IP: src.IP(),
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Port: 0,
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}
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}
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return &net.UDPAddr{
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IP: src.IP(),
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Port: 0,
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}
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}
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func hasBindAddr(sockopt *SocketConfig) bool {
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return sockopt != nil && len(sockopt.BindAddress) > 0 && sockopt.BindPort > 0
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}
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func (d *DefaultSystemDialer) lookupIP(domain string, strategy DomainStrategy, localAddr net.Address) ([]net.IP, error) {
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if d.dns == nil {
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return nil, nil
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}
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var option = dns.IPOption{
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IPv4Enable: true,
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IPv6Enable: true,
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FakeEnable: false,
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}
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switch {
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case strategy == DomainStrategy_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()):
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option = dns.IPOption{
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IPv4Enable: true,
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IPv6Enable: false,
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FakeEnable: false,
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}
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case strategy == DomainStrategy_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()):
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option = dns.IPOption{
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IPv4Enable: false,
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IPv6Enable: true,
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FakeEnable: false,
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}
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case strategy == DomainStrategy_AS_IS:
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return nil, nil
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}
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return d.dns.LookupIP(domain, option)
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}
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func (d *DefaultSystemDialer) canLookupIP(ctx context.Context, dst net.Destination, sockopt *SocketConfig) bool {
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if sockopt == nil || dst.Address.Family().IsIP() || d.dns == nil {
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return false
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}
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if dst.Address.Domain() == LookupDomainFromContext(ctx) {
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newError("infinite loop detected").AtError().WriteToLog(session.ExportIDToError(ctx))
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return false
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}
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return sockopt.DomainStrategy != DomainStrategy_AS_IS
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}
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func (d *DefaultSystemDialer) redirect(ctx context.Context, dst net.Destination, obt string) net.Conn {
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newError("redirecting request " + dst.String() + " to " + obt).WriteToLog(session.ExportIDToError(ctx))
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h := d.obm.GetHandler(obt)
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ctx = session.ContextWithOutbound(ctx, &session.Outbound{dst, nil})
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if h != nil {
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ur, uw := pipe.New(pipe.OptionsFromContext(ctx)...)
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dr, dw := pipe.New(pipe.OptionsFromContext(ctx)...)
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go h.Dispatch(ctx, &transport.Link{ur, dw})
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nc := cnc.NewConnection(
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cnc.ConnectionInputMulti(uw),
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cnc.ConnectionOutputMulti(dr),
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cnc.ConnectionOnClose(common.ChainedClosable{uw, dw}),
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)
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return nc
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}
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return nil
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}
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func (d *DefaultSystemDialer) Dial(ctx context.Context, src net.Address, dest net.Destination, sockopt *SocketConfig) (net.Conn, error) {
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newError("dialing to " + dest.String()).AtDebug().WriteToLog()
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if d.obm != nil && sockopt != nil && len(sockopt.DialerProxy) > 0 {
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nc := d.redirect(ctx, dest, sockopt.DialerProxy)
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if nc != nil {
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return nc, nil
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}
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}
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if d.canLookupIP(ctx, dest, sockopt) {
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ips, err := d.lookupIP(dest.Address.String(), sockopt.DomainStrategy, src)
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if err == nil && len(ips) > 0 {
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dest.Address = net.IPAddress(ips[dice.Roll(len(ips))])
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newError("replace destination with " + dest.String()).AtInfo().WriteToLog()
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} else if err != nil {
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newError("failed to resolve ip").Base(err).AtWarning().WriteToLog()
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}
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}
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if dest.Network == net.Network_UDP && !hasBindAddr(sockopt) {
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srcAddr := resolveSrcAddr(net.Network_UDP, src)
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if srcAddr == nil {
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srcAddr = &net.UDPAddr{
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IP: []byte{0, 0, 0, 0},
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Port: 0,
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}
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}
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packetConn, err := ListenSystemPacket(ctx, srcAddr, sockopt)
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if err != nil {
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return nil, err
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}
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destAddr, err := net.ResolveUDPAddr("udp", dest.NetAddr())
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if err != nil {
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return nil, err
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}
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return &PacketConnWrapper{
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conn: packetConn,
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dest: destAddr,
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}, nil
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}
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dialer := &net.Dialer{
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Timeout: time.Second * 16,
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DualStack: true,
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LocalAddr: resolveSrcAddr(dest.Network, src),
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}
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if sockopt != nil || len(d.controllers) > 0 {
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dialer.Control = func(network, address string, c syscall.RawConn) error {
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return c.Control(func(fd uintptr) {
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if sockopt != nil {
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if err := applyOutboundSocketOptions(network, address, fd, sockopt); err != nil {
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newError("failed to apply socket options").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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if dest.Network == net.Network_UDP && hasBindAddr(sockopt) {
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if err := bindAddr(fd, sockopt.BindAddress, sockopt.BindPort); err != nil {
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newError("failed to bind source address to ", sockopt.BindAddress).Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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}
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for _, ctl := range d.controllers {
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if err := ctl(network, address, fd); err != nil {
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newError("failed to apply external controller").Base(err).WriteToLog(session.ExportIDToError(ctx))
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}
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}
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})
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}
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}
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return dialer.DialContext(ctx, dest.Network.SystemString(), dest.NetAddr())
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}
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func (d *DefaultSystemDialer) Init(dc dns.Client, om outbound.Manager) {
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d.dns = dc
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d.obm = om
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}
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type PacketConnWrapper struct {
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conn net.PacketConn
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dest net.Addr
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}
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func (c *PacketConnWrapper) Close() error {
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return c.conn.Close()
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}
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func (c *PacketConnWrapper) LocalAddr() net.Addr {
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return c.conn.LocalAddr()
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}
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func (c *PacketConnWrapper) RemoteAddr() net.Addr {
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return c.dest
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}
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func (c *PacketConnWrapper) Write(p []byte) (int, error) {
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return c.conn.WriteTo(p, c.dest)
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}
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func (c *PacketConnWrapper) Read(p []byte) (int, error) {
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n, _, err := c.conn.ReadFrom(p)
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return n, err
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}
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func (c *PacketConnWrapper) WriteTo(p []byte, d net.Addr) (int, error) {
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return c.conn.WriteTo(p, d)
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}
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func (c *PacketConnWrapper) ReadFrom(p []byte) (int, net.Addr, error) {
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return c.conn.ReadFrom(p)
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}
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func (c *PacketConnWrapper) SetDeadline(t time.Time) error {
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return c.conn.SetDeadline(t)
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}
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func (c *PacketConnWrapper) SetReadDeadline(t time.Time) error {
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return c.conn.SetReadDeadline(t)
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}
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func (c *PacketConnWrapper) SetWriteDeadline(t time.Time) error {
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return c.conn.SetWriteDeadline(t)
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}
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type SystemDialerAdapter interface {
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Dial(network string, address string) (net.Conn, error)
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}
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type SimpleSystemDialer struct {
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adapter SystemDialerAdapter
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}
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func WithAdapter(dialer SystemDialerAdapter) SystemDialer {
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return &SimpleSystemDialer{
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adapter: dialer,
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}
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}
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func (v *SimpleSystemDialer) Init(_ dns.Client, _ outbound.Manager) {}
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func (v *SimpleSystemDialer) Dial(ctx context.Context, src net.Address, dest net.Destination, sockopt *SocketConfig) (net.Conn, error) {
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return v.adapter.Dial(dest.Network.SystemString(), dest.NetAddr())
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}
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// UseAlternativeSystemDialer replaces the current system dialer with a given one.
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// Caller must ensure there is no race condition.
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//
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// xray:api:stable
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func UseAlternativeSystemDialer(dialer SystemDialer) {
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if dialer == nil {
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effectiveSystemDialer = &DefaultSystemDialer{}
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}
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effectiveSystemDialer = dialer
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}
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// RegisterDialerController adds a controller to the effective system dialer.
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// The controller can be used to operate on file descriptors before they are put into use.
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// It only works when effective dialer is the default dialer.
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//
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// xray:api:beta
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func RegisterDialerController(ctl func(network, address string, fd uintptr) error) error {
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if ctl == nil {
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return newError("nil listener controller")
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}
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dialer, ok := effectiveSystemDialer.(*DefaultSystemDialer)
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if !ok {
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return newError("RegisterListenerController not supported in custom dialer")
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}
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dialer.controllers = append(dialer.controllers, ctl)
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return nil
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}
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