sing-box/outbound/direct.go
2022-08-23 21:07:35 +08:00

117 lines
3.7 KiB
Go

package outbound
import (
"context"
"net"
"net/netip"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/common/dialer"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/pires/go-proxyproto"
)
var _ adapter.Outbound = (*Direct)(nil)
type Direct struct {
myOutboundAdapter
dialer N.Dialer
overrideOption int
overrideDestination M.Socksaddr
proxyProto uint8
}
func NewDirect(router adapter.Router, logger log.ContextLogger, tag string, options option.DirectOutboundOptions) (*Direct, error) {
outbound := &Direct{
myOutboundAdapter: myOutboundAdapter{
protocol: C.TypeDirect,
network: []string{N.NetworkTCP, N.NetworkUDP},
router: router,
logger: logger,
tag: tag,
},
dialer: dialer.NewOutbound(router, options.OutboundDialerOptions),
proxyProto: options.ProxyProtocol,
}
if options.ProxyProtocol > 2 {
return nil, E.New("invalid proxy protocol option: ", options.ProxyProtocol)
}
if options.OverrideAddress != "" && options.OverridePort != 0 {
outbound.overrideOption = 1
outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
} else if options.OverrideAddress != "" {
outbound.overrideOption = 2
outbound.overrideDestination = M.ParseSocksaddrHostPort(options.OverrideAddress, options.OverridePort)
} else if options.OverridePort != 0 {
outbound.overrideOption = 3
outbound.overrideDestination = M.Socksaddr{Port: options.OverridePort}
}
return outbound, nil
}
func (h *Direct) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
ctx, metadata := adapter.AppendContext(ctx)
originDestination := metadata.Destination
metadata.Outbound = h.tag
metadata.Destination = destination
switch h.overrideOption {
case 1:
destination = h.overrideDestination
case 2:
newDestination := h.overrideDestination
newDestination.Port = destination.Port
destination = newDestination
case 3:
destination.Port = h.overrideDestination.Port
}
network = N.NetworkName(network)
switch network {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
}
conn, err := h.dialer.DialContext(ctx, network, destination)
if err != nil {
return nil, err
}
if h.proxyProto > 0 {
source := metadata.Source
if !source.IsValid() {
source = M.SocksaddrFromNet(conn.LocalAddr())
}
if originDestination.Addr.Is6() {
source = M.SocksaddrFrom(netip.AddrFrom16(source.Addr.As16()), source.Port)
}
header := proxyproto.HeaderProxyFromAddrs(h.proxyProto, source.TCPAddr(), originDestination.TCPAddr())
_, err = header.WriteTo(conn)
if err != nil {
conn.Close()
return nil, E.Cause(err, "write proxy protocol header")
}
}
return conn, nil
}
func (h *Direct) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
ctx, metadata := adapter.AppendContext(ctx)
metadata.Outbound = h.tag
metadata.Destination = destination
h.logger.InfoContext(ctx, "outbound packet connection")
return h.dialer.ListenPacket(ctx, destination)
}
func (h *Direct) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
return NewConnection(ctx, h, conn, metadata)
}
func (h *Direct) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
return NewPacketConnection(ctx, h, conn, metadata)
}