132 lines
2.9 KiB
Go
132 lines
2.9 KiB
Go
package ss
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import (
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"context"
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"errors"
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"fmt"
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"net"
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"time"
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"github.com/go-gost/gosocks5"
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"github.com/go-gost/gost/pkg/common/bufpool"
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"github.com/go-gost/gost/pkg/common/util/socks"
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"github.com/go-gost/gost/pkg/common/util/ss"
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"github.com/go-gost/gost/pkg/connector"
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"github.com/go-gost/gost/pkg/logger"
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md "github.com/go-gost/gost/pkg/metadata"
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"github.com/go-gost/gost/pkg/registry"
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)
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func init() {
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registry.RegiserConnector("ss", NewConnector)
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}
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type ssConnector struct {
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md metadata
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logger logger.Logger
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}
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func NewConnector(opts ...connector.Option) connector.Connector {
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options := &connector.Options{}
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for _, opt := range opts {
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opt(options)
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}
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return &ssConnector{
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logger: options.Logger,
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}
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}
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func (c *ssConnector) Init(md md.Metadata) (err error) {
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return c.parseMetadata(md)
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}
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func (c *ssConnector) Connect(ctx context.Context, conn net.Conn, network, address string, opts ...connector.ConnectOption) (net.Conn, error) {
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c.logger = c.logger.WithFields(map[string]interface{}{
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"remote": conn.RemoteAddr().String(),
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"local": conn.LocalAddr().String(),
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"network": network,
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"address": address,
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})
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c.logger.Infof("connect: %s/%s", address, network)
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switch network {
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case "tcp", "tcp4", "tcp6":
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case "udp", "udp4", "udp6":
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return c.connectUDP(ctx, conn, network, address)
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default:
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err := fmt.Errorf("network %s unsupported", network)
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c.logger.Error(err)
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return nil, err
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}
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addr := gosocks5.Addr{}
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if err := addr.ParseFrom(address); err != nil {
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c.logger.Error(err)
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return nil, err
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}
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rawaddr := bufpool.Get(512)
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defer bufpool.Put(rawaddr)
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n, err := addr.Encode(rawaddr)
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if err != nil {
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c.logger.Error("encoding addr: ", err)
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return nil, err
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}
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if c.md.connectTimeout > 0 {
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conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
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defer conn.SetDeadline(time.Time{})
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}
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if c.md.cipher != nil {
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conn = c.md.cipher.StreamConn(conn)
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}
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var sc net.Conn
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if c.md.noDelay {
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sc = ss.ShadowConn(conn, nil)
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// write the addr at once.
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if _, err := sc.Write(rawaddr[:n]); err != nil {
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return nil, err
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}
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} else {
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// cache the header
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sc = ss.ShadowConn(conn, rawaddr[:n])
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}
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return sc, nil
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}
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func (c *ssConnector) connectUDP(ctx context.Context, conn net.Conn, network, address string) (net.Conn, error) {
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if c.md.enableUDP {
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err := errors.New("UDP relay is disabled")
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c.logger.Error(err)
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return nil, err
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}
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if c.md.connectTimeout > 0 {
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conn.SetDeadline(time.Now().Add(c.md.connectTimeout))
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defer conn.SetDeadline(time.Time{})
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}
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taddr, _ := net.ResolveUDPAddr(network, address)
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if taddr == nil {
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taddr = &net.UDPAddr{}
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}
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pc, ok := conn.(net.PacketConn)
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if ok {
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if c.md.cipher != nil {
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pc = c.md.cipher.PacketConn(pc)
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}
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return ss.UDPClientConn(pc, conn.RemoteAddr(), taddr, c.md.udpBufferSize), nil
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}
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if c.md.cipher != nil {
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conn = ss.ShadowConn(c.md.cipher.StreamConn(conn), nil)
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}
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return socks.UDPTunClientConn(conn, taddr), nil
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}
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