package dns_test import ( "strconv" "testing" "time" "github.com/google/go-cmp/cmp" "github.com/miekg/dns" "google.golang.org/protobuf/types/known/anypb" core "github.com/v2fly/v2ray-core/v4" "github.com/v2fly/v2ray-core/v4/app/dispatcher" dnsapp "github.com/v2fly/v2ray-core/v4/app/dns" "github.com/v2fly/v2ray-core/v4/app/policy" "github.com/v2fly/v2ray-core/v4/app/proxyman" _ "github.com/v2fly/v2ray-core/v4/app/proxyman/inbound" _ "github.com/v2fly/v2ray-core/v4/app/proxyman/outbound" "github.com/v2fly/v2ray-core/v4/common" "github.com/v2fly/v2ray-core/v4/common/net" "github.com/v2fly/v2ray-core/v4/common/serial" dns_proxy "github.com/v2fly/v2ray-core/v4/proxy/dns" "github.com/v2fly/v2ray-core/v4/proxy/dokodemo" "github.com/v2fly/v2ray-core/v4/testing/servers/tcp" "github.com/v2fly/v2ray-core/v4/testing/servers/udp" ) type staticHandler struct{} func (*staticHandler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) { ans := new(dns.Msg) ans.Id = r.Id var clientIP net.IP opt := r.IsEdns0() if opt != nil { for _, o := range opt.Option { if o.Option() == dns.EDNS0SUBNET { subnet := o.(*dns.EDNS0_SUBNET) clientIP = subnet.Address } } } for _, q := range r.Question { switch { case q.Name == "google.com." && q.Qtype == dns.TypeA: if clientIP == nil { rr, _ := dns.NewRR("google.com. IN A 8.8.8.8") ans.Answer = append(ans.Answer, rr) } else { rr, _ := dns.NewRR("google.com. IN A 8.8.4.4") ans.Answer = append(ans.Answer, rr) } case q.Name == "facebook.com." && q.Qtype == dns.TypeA: rr, _ := dns.NewRR("facebook.com. IN A 9.9.9.9") ans.Answer = append(ans.Answer, rr) case q.Name == "ipv6.google.com." && q.Qtype == dns.TypeA: rr, err := dns.NewRR("ipv6.google.com. IN A 8.8.8.7") common.Must(err) ans.Answer = append(ans.Answer, rr) case q.Name == "ipv6.google.com." && q.Qtype == dns.TypeAAAA: rr, err := dns.NewRR("ipv6.google.com. IN AAAA 2001:4860:4860::8888") common.Must(err) ans.Answer = append(ans.Answer, rr) case q.Name == "notexist.google.com." && q.Qtype == dns.TypeAAAA: ans.MsgHdr.Rcode = dns.RcodeNameError } } w.WriteMsg(ans) } func TestUDPDNSTunnel(t *testing.T) { port := udp.PickPort() dnsServer := dns.Server{ Addr: "127.0.0.1:" + port.String(), Net: "udp", Handler: &staticHandler{}, UDPSize: 1200, } defer dnsServer.Shutdown() go dnsServer.ListenAndServe() time.Sleep(time.Second) serverPort := udp.PickPort() config := &core.Config{ App: []*anypb.Any{ serial.ToTypedMessage(&dnsapp.Config{ NameServers: []*net.Endpoint{ { Network: net.Network_UDP, Address: &net.IPOrDomain{ Address: &net.IPOrDomain_Ip{ Ip: []byte{127, 0, 0, 1}, }, }, Port: uint32(port), }, }, }), serial.ToTypedMessage(&dispatcher.Config{}), serial.ToTypedMessage(&proxyman.OutboundConfig{}), serial.ToTypedMessage(&proxyman.InboundConfig{}), serial.ToTypedMessage(&policy.Config{}), }, Inbound: []*core.InboundHandlerConfig{ { ProxySettings: serial.ToTypedMessage(&dokodemo.Config{ Address: net.NewIPOrDomain(net.LocalHostIP), Port: uint32(port), Networks: []net.Network{net.Network_UDP}, }), ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{ PortRange: net.SinglePortRange(serverPort), Listen: net.NewIPOrDomain(net.LocalHostIP), }), }, }, Outbound: []*core.OutboundHandlerConfig{ { ProxySettings: serial.ToTypedMessage(&dns_proxy.Config{}), }, }, } v, err := core.New(config) common.Must(err) common.Must(v.Start()) defer v.Close() { m1 := new(dns.Msg) m1.Id = dns.Id() m1.RecursionDesired = true m1.Question = make([]dns.Question, 1) m1.Question[0] = dns.Question{Name: "google.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET} c := new(dns.Client) in, _, err := c.Exchange(m1, "127.0.0.1:"+strconv.Itoa(int(serverPort))) common.Must(err) if len(in.Answer) != 1 { t.Fatal("len(answer): ", len(in.Answer)) } rr, ok := in.Answer[0].(*dns.A) if !ok { t.Fatal("not A record") } if r := cmp.Diff(rr.A[:], net.IP{8, 8, 8, 8}); r != "" { t.Error(r) } } { m1 := new(dns.Msg) m1.Id = dns.Id() m1.RecursionDesired = true m1.Question = make([]dns.Question, 1) m1.Question[0] = dns.Question{Name: "ipv4only.google.com.", Qtype: dns.TypeAAAA, Qclass: dns.ClassINET} c := new(dns.Client) c.Timeout = 10 * time.Second in, _, err := c.Exchange(m1, "127.0.0.1:"+strconv.Itoa(int(serverPort))) common.Must(err) if len(in.Answer) != 0 { t.Fatal("len(answer): ", len(in.Answer)) } } { m1 := new(dns.Msg) m1.Id = dns.Id() m1.RecursionDesired = true m1.Question = make([]dns.Question, 1) m1.Question[0] = dns.Question{Name: "notexist.google.com.", Qtype: dns.TypeAAAA, Qclass: dns.ClassINET} c := new(dns.Client) in, _, err := c.Exchange(m1, "127.0.0.1:"+strconv.Itoa(int(serverPort))) common.Must(err) if in.Rcode != dns.RcodeNameError { t.Error("expected NameError, but got ", in.Rcode) } } } func TestTCPDNSTunnel(t *testing.T) { port := udp.PickPort() dnsServer := dns.Server{ Addr: "127.0.0.1:" + port.String(), Net: "udp", Handler: &staticHandler{}, } defer dnsServer.Shutdown() go dnsServer.ListenAndServe() time.Sleep(time.Second) serverPort := tcp.PickPort() config := &core.Config{ App: []*anypb.Any{ serial.ToTypedMessage(&dnsapp.Config{ NameServer: []*dnsapp.NameServer{ { Address: &net.Endpoint{ Network: net.Network_UDP, Address: &net.IPOrDomain{ Address: &net.IPOrDomain_Ip{ Ip: []byte{127, 0, 0, 1}, }, }, Port: uint32(port), }, }, }, }), serial.ToTypedMessage(&dispatcher.Config{}), serial.ToTypedMessage(&proxyman.OutboundConfig{}), serial.ToTypedMessage(&proxyman.InboundConfig{}), serial.ToTypedMessage(&policy.Config{}), }, Inbound: []*core.InboundHandlerConfig{ { ProxySettings: serial.ToTypedMessage(&dokodemo.Config{ Address: net.NewIPOrDomain(net.LocalHostIP), Port: uint32(port), Networks: []net.Network{net.Network_TCP}, }), ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{ PortRange: net.SinglePortRange(serverPort), Listen: net.NewIPOrDomain(net.LocalHostIP), }), }, }, Outbound: []*core.OutboundHandlerConfig{ { ProxySettings: serial.ToTypedMessage(&dns_proxy.Config{}), }, }, } v, err := core.New(config) common.Must(err) common.Must(v.Start()) defer v.Close() m1 := new(dns.Msg) m1.Id = dns.Id() m1.RecursionDesired = true m1.Question = make([]dns.Question, 1) m1.Question[0] = dns.Question{Name: "google.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET} c := &dns.Client{ Net: "tcp", } in, _, err := c.Exchange(m1, "127.0.0.1:"+serverPort.String()) common.Must(err) if len(in.Answer) != 1 { t.Fatal("len(answer): ", len(in.Answer)) } rr, ok := in.Answer[0].(*dns.A) if !ok { t.Fatal("not A record") } if r := cmp.Diff(rr.A[:], net.IP{8, 8, 8, 8}); r != "" { t.Error(r) } } func TestUDP2TCPDNSTunnel(t *testing.T) { port := tcp.PickPort() dnsServer := dns.Server{ Addr: "127.0.0.1:" + port.String(), Net: "tcp", Handler: &staticHandler{}, } defer dnsServer.Shutdown() go dnsServer.ListenAndServe() time.Sleep(time.Second) serverPort := tcp.PickPort() config := &core.Config{ App: []*anypb.Any{ serial.ToTypedMessage(&dnsapp.Config{ NameServer: []*dnsapp.NameServer{ { Address: &net.Endpoint{ Network: net.Network_UDP, Address: &net.IPOrDomain{ Address: &net.IPOrDomain_Ip{ Ip: []byte{127, 0, 0, 1}, }, }, Port: uint32(port), }, }, }, }), serial.ToTypedMessage(&dispatcher.Config{}), serial.ToTypedMessage(&proxyman.OutboundConfig{}), serial.ToTypedMessage(&proxyman.InboundConfig{}), serial.ToTypedMessage(&policy.Config{}), }, Inbound: []*core.InboundHandlerConfig{ { ProxySettings: serial.ToTypedMessage(&dokodemo.Config{ Address: net.NewIPOrDomain(net.LocalHostIP), Port: uint32(port), Networks: []net.Network{net.Network_TCP}, }), ReceiverSettings: serial.ToTypedMessage(&proxyman.ReceiverConfig{ PortRange: net.SinglePortRange(serverPort), Listen: net.NewIPOrDomain(net.LocalHostIP), }), }, }, Outbound: []*core.OutboundHandlerConfig{ { ProxySettings: serial.ToTypedMessage(&dns_proxy.Config{ Server: &net.Endpoint{ Network: net.Network_TCP, }, }), }, }, } v, err := core.New(config) common.Must(err) common.Must(v.Start()) defer v.Close() m1 := new(dns.Msg) m1.Id = dns.Id() m1.RecursionDesired = true m1.Question = make([]dns.Question, 1) m1.Question[0] = dns.Question{Name: "google.com.", Qtype: dns.TypeA, Qclass: dns.ClassINET} c := &dns.Client{ Net: "tcp", } in, _, err := c.Exchange(m1, "127.0.0.1:"+serverPort.String()) common.Must(err) if len(in.Answer) != 1 { t.Fatal("len(answer): ", len(in.Answer)) } rr, ok := in.Answer[0].(*dns.A) if !ok { t.Fatal("not A record") } if r := cmp.Diff(rr.A[:], net.IP{8, 8, 8, 8}); r != "" { t.Error(r) } }