sing-box/outbound/trojan.go

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2022-08-08 00:56:04 +00:00
package outbound
import (
"context"
"net"
"github.com/sagernet/sing-box/adapter"
"github.com/sagernet/sing-box/common/dialer"
"github.com/sagernet/sing-box/common/mux"
C "github.com/sagernet/sing-box/constant"
"github.com/sagernet/sing-box/log"
"github.com/sagernet/sing-box/option"
"github.com/sagernet/sing/common"
E "github.com/sagernet/sing/common/exceptions"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
"github.com/sagernet/sing/protocol/trojan"
)
var _ adapter.Outbound = (*Trojan)(nil)
type Trojan struct {
myOutboundAdapter
dialer N.Dialer
serverAddr M.Socksaddr
key [56]byte
multiplexDialer N.Dialer
}
func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TrojanOutboundOptions) (*Trojan, error) {
inbound := &Trojan{
myOutboundAdapter: myOutboundAdapter{
protocol: C.TypeTrojan,
network: options.Network.Build(),
router: router,
logger: logger,
tag: tag,
},
serverAddr: options.ServerOptions.Build(),
key: trojan.Key(options.Password),
}
var err error
inbound.dialer, err = dialer.NewTLS(dialer.NewOutbound(router, options.OutboundDialerOptions), options.Server, common.PtrValueOrDefault(options.TLSOptions))
if err != nil {
return nil, err
}
inbound.multiplexDialer, err = mux.NewClientWithOptions(ctx, (*TrojanDialer)(inbound), common.PtrValueOrDefault(options.MultiplexOptions))
if err != nil {
return nil, err
}
return inbound, nil
}
func (h *Trojan) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
if h.multiplexDialer == nil {
switch N.NetworkName(network) {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
}
return (*TrojanDialer)(h).DialContext(ctx, network, destination)
} else {
switch N.NetworkName(network) {
case N.NetworkTCP:
h.logger.InfoContext(ctx, "outbound multiplex connection to ", destination)
case N.NetworkUDP:
h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
}
return h.multiplexDialer.DialContext(ctx, network, destination)
}
}
func (h *Trojan) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
if h.multiplexDialer == nil {
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
return (*TrojanDialer)(h).ListenPacket(ctx, destination)
} else {
h.logger.InfoContext(ctx, "outbound multiplex packet connection to ", destination)
return h.multiplexDialer.ListenPacket(ctx, destination)
}
}
func (h *Trojan) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
return NewEarlyConnection(ctx, h, conn, metadata)
}
func (h *Trojan) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
return NewPacketConnection(ctx, h, conn, metadata)
}
type TrojanDialer Trojan
func (h *TrojanDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
ctx, metadata := adapter.AppendContext(ctx)
metadata.Outbound = h.tag
metadata.Destination = destination
switch N.NetworkName(network) {
case N.NetworkTCP:
outConn, err := h.dialer.DialContext(ctx, N.NetworkTCP, h.serverAddr)
if err != nil {
return nil, err
}
return trojan.NewClientConn(outConn, h.key, destination), nil
case N.NetworkUDP:
outConn, err := h.dialer.DialContext(ctx, N.NetworkTCP, h.serverAddr)
if err != nil {
return nil, err
}
return trojan.NewClientPacketConn(outConn, h.key), nil
default:
return nil, E.Extend(N.ErrUnknownNetwork, network)
}
}
func (h *TrojanDialer) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
conn, err := h.DialContext(ctx, N.NetworkUDP, destination)
if err != nil {
return nil, err
}
return conn.(*trojan.ClientPacketConn), nil
}