|
| 1 | +package v2raydnstt |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "sync" |
| 6 | + |
| 7 | + "github.com/sagernet/sing-box/common/tls" |
| 8 | + |
| 9 | + "fmt" |
| 10 | + "log" |
| 11 | + "net" |
| 12 | + |
| 13 | + dnstt "github.com/mahsanet/dnstt/client" |
| 14 | + "github.com/sagernet/sing-box/adapter" |
| 15 | + "github.com/sagernet/sing-box/option" |
| 16 | + E "github.com/sagernet/sing/common/exceptions" |
| 17 | + M "github.com/sagernet/sing/common/metadata" |
| 18 | + N "github.com/sagernet/sing/common/network" |
| 19 | +) |
| 20 | + |
| 21 | +var _ adapter.V2RayClientTransport = (*Client)(nil) |
| 22 | + |
| 23 | +type Client struct { |
| 24 | + ctx context.Context |
| 25 | + dialer N.Dialer |
| 26 | + resolvers []dnstt.Resolver |
| 27 | + publicKey string |
| 28 | + domain string |
| 29 | + tunnel *dnstt.Tunnel |
| 30 | + mu sync.Mutex |
| 31 | +} |
| 32 | + |
| 33 | +// Close implements [adapter.V2RayClientTransport]. |
| 34 | +func (c *Client) Close() error { |
| 35 | + |
| 36 | +} |
| 37 | + |
| 38 | +func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.DnsttOptions, tlsConfig tls.Config) (adapter.V2RayClientTransport, error) { |
| 39 | + resolvers := []dnstt.Resolver{} |
| 40 | + for _, resolverAddr := range options.Resolvers { |
| 41 | + resolver, err := dnstt.NewResolver(dnstt.ResolverTypeUDP, resolverAddr) |
| 42 | + if err != nil { |
| 43 | + return nil, fmt.Errorf("invalid resolver address %s: %w", resolverAddr, err) |
| 44 | + } |
| 45 | + resolvers = append(resolvers, resolver) |
| 46 | + } |
| 47 | + |
| 48 | + if len(resolvers) == 0 { |
| 49 | + return nil, E.New("at least one resolver is required") |
| 50 | + } |
| 51 | + |
| 52 | + if options.PublicKey == "" { |
| 53 | + return nil, E.New("public key is required") |
| 54 | + } |
| 55 | + |
| 56 | + if options.Domain == "" { |
| 57 | + return nil, E.New("domain is required") |
| 58 | + } |
| 59 | + return &Client{ |
| 60 | + ctx: ctx, |
| 61 | + dialer: dialer, |
| 62 | + domain: options.Domain, |
| 63 | + publicKey: options.PublicKey, |
| 64 | + resolvers: resolvers, |
| 65 | + }, nil |
| 66 | +} |
| 67 | + |
| 68 | +func (c *Client) DialContext(ctx context.Context) (net.Conn, error) { |
| 69 | + |
| 70 | + tunnel, err := c.establishDnsttTunnel(ctx) |
| 71 | + if err != nil { |
| 72 | + return nil, fmt.Errorf("failed to get or establish tunnel: %w", err) |
| 73 | + } |
| 74 | + |
| 75 | + stream, err := tunnel.OpenStream() |
| 76 | + if err != nil { |
| 77 | + return nil, fmt.Errorf("failed to open stream: %w", err) |
| 78 | + } |
| 79 | + |
| 80 | + return stream, nil |
| 81 | +} |
| 82 | + |
| 83 | +func (c *Client) establishDnsttTunnel(ctx context.Context) (*dnstt.Tunnel, error) { |
| 84 | + // dnsttConfig := streamSettings.ProtocolSettings.(*Config) |
| 85 | + c.mu.Lock() |
| 86 | + defer c.mu.Unlock() |
| 87 | + if c.tunnel != nil { |
| 88 | + return c.tunnel, nil |
| 89 | + } |
| 90 | + tServer, err := dnstt.NewTunnelServer(c.domain, c.publicKey) |
| 91 | + if err != nil { |
| 92 | + return nil, fmt.Errorf("invalid tunnel server: %w", err) |
| 93 | + } |
| 94 | + |
| 95 | + tunnelServers := []dnstt.TunnelServer{tServer} |
| 96 | + |
| 97 | + resolver := c.resolvers[0] |
| 98 | + tunnelServer := tunnelServers[0] |
| 99 | + |
| 100 | + tunnel, err := dnstt.NewTunnel(resolver, tunnelServer) |
| 101 | + if err != nil { |
| 102 | + return nil, fmt.Errorf("failed to create tunnel: %w", err) |
| 103 | + } |
| 104 | + |
| 105 | + if err := tunnel.InitiateResolverConnection(); err != nil { |
| 106 | + return nil, fmt.Errorf("failed to initiate connection to resolver: %w", err) |
| 107 | + } |
| 108 | + |
| 109 | + if err := tunnel.InitiateDNSPacketConn(tunnelServer.Addr); err != nil { |
| 110 | + return nil, fmt.Errorf("failed to initiate DNS packet connection: %w", err) |
| 111 | + } |
| 112 | + |
| 113 | + log.Printf("effective MTU %d", tunnelServer.MTU) |
| 114 | + |
| 115 | + if err := tunnel.InitiateKCPConn(tunnelServer.MTU); err != nil { |
| 116 | + return nil, fmt.Errorf("failed to initiate KCP connection: %w", err) |
| 117 | + } |
| 118 | + |
| 119 | + log.Printf("established KCP conn") |
| 120 | + |
| 121 | + if err := tunnel.InitiateNoiseChannel(); err != nil { |
| 122 | + log.Printf("failed to establish Noise channel: %v", err) |
| 123 | + return nil, fmt.Errorf("failed to initiate Noise channel: %w", err) |
| 124 | + } |
| 125 | + |
| 126 | + log.Printf("established Noise channel") |
| 127 | + |
| 128 | + if err := tunnel.InitiateSmuxSession(); err != nil { |
| 129 | + return nil, fmt.Errorf("failed to initiate smux session: %w", err) |
| 130 | + } |
| 131 | + |
| 132 | + c.tunnel = tunnel |
| 133 | + log.Printf("established smux session") |
| 134 | + return tunnel, nil |
| 135 | +} |
0 commit comments