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socks.go
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socks.go
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package outbound
import (
"context"
"net"
"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"
"github.com/sagernet/sing-dns"
"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/common/uot"
"github.com/sagernet/sing/protocol/socks"
)
var _ adapter.Outbound = (*Socks)(nil)
type Socks struct {
myOutboundAdapter
client *socks.Client
resolve bool
uotClient *uot.Client
}
func NewSocks(router adapter.Router, logger log.ContextLogger, tag string, options option.SocksOutboundOptions) (*Socks, error) {
var version socks.Version
var err error
if options.Version != "" {
version, err = socks.ParseVersion(options.Version)
} else {
version = socks.Version5
}
if err != nil {
return nil, err
}
outboundDialer, err := dialer.New(router, options.DialerOptions)
if err != nil {
return nil, err
}
outbound := &Socks{
myOutboundAdapter: myOutboundAdapter{
protocol: C.TypeSOCKS,
network: options.Network.Build(),
router: router,
logger: logger,
tag: tag,
dependencies: withDialerDependency(options.DialerOptions),
},
client: socks.NewClient(outboundDialer, options.ServerOptions.Build(), version, options.Username, options.Password),
resolve: version == socks.Version4,
}
uotOptions := common.PtrValueOrDefault(options.UDPOverTCP)
if uotOptions.Enabled {
outbound.uotClient = &uot.Client{
Dialer: outbound.client,
Version: uotOptions.Version,
}
}
return outbound, nil
}
func (h *Socks) 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:
h.logger.InfoContext(ctx, "outbound connection to ", destination)
case N.NetworkUDP:
if h.uotClient != nil {
h.logger.InfoContext(ctx, "outbound UoT connect packet connection to ", destination)
return h.uotClient.DialContext(ctx, network, destination)
}
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
default:
return nil, E.Extend(N.ErrUnknownNetwork, network)
}
if h.resolve && destination.IsFqdn() {
destinationAddresses, err := h.router.LookupDefault(ctx, destination.Fqdn)
if err != nil {
return nil, err
}
return N.DialSerial(ctx, h.client, network, destination, destinationAddresses)
}
return h.client.DialContext(ctx, network, destination)
}
func (h *Socks) ListenPacket(ctx context.Context, destination M.Socksaddr) (net.PacketConn, error) {
ctx, metadata := adapter.AppendContext(ctx)
metadata.Outbound = h.tag
metadata.Destination = destination
if h.uotClient != nil {
h.logger.InfoContext(ctx, "outbound UoT packet connection to ", destination)
return h.uotClient.ListenPacket(ctx, destination)
}
if h.resolve && destination.IsFqdn() {
destinationAddresses, err := h.router.LookupDefault(ctx, destination.Fqdn)
if err != nil {
return nil, err
}
packetConn, _, err := N.ListenSerial(ctx, h.client, destination, destinationAddresses)
if err != nil {
return nil, err
}
return packetConn, nil
}
h.logger.InfoContext(ctx, "outbound packet connection to ", destination)
return h.client.ListenPacket(ctx, destination)
}
func (h *Socks) NewConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
if h.resolve {
return NewDirectConnection(ctx, h.router, h, conn, metadata, dns.DomainStrategyUseIPv4)
} else {
return NewConnection(ctx, h, conn, metadata)
}
}
func (h *Socks) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata adapter.InboundContext) error {
if h.resolve {
return NewDirectPacketConnection(ctx, h.router, h, conn, metadata, dns.DomainStrategyUseIPv4)
} else {
return NewPacketConnection(ctx, h, conn, metadata)
}
}