// +build linux,!appengine package dns import ( "bytes" "net" "strings" "testing" "time" "golang.org/x/net/ipv4" "golang.org/x/net/ipv6" ) func TestSetUDPSocketOptions(t *testing.T) { // returns an error if we cannot resolve that address testFamily := func(n, addr string) error { a, err := net.ResolveUDPAddr(n, addr) if err != nil { return err } c, err := net.ListenUDP(n, a) if err != nil { return err } if err := setUDPSocketOptions(c); err != nil { t.Fatalf("failed to set socket options: %v", err) } ch := make(chan *SessionUDP) go func() { // Set some deadline so this goroutine doesn't hang forever c.SetReadDeadline(time.Now().Add(time.Minute)) b := make([]byte, 1) _, sess, err := ReadFromSessionUDP(c, b) if err != nil { t.Fatalf("failed to read from conn: %v", err) } ch <- sess }() c2, err := net.Dial("udp", c.LocalAddr().String()) if err != nil { t.Fatalf("failed to dial udp: %v", err) } if _, err := c2.Write([]byte{1}); err != nil { t.Fatalf("failed to write to conn: %v", err) } sess := <-ch if len(sess.context) == 0 { t.Fatalf("empty session context: %v", sess) } ip := parseDstFromOOB(sess.context) if ip == nil { t.Fatalf("failed to parse dst: %v", sess) } if !strings.Contains(c.LocalAddr().String(), ip.String()) { t.Fatalf("dst was different than listen addr: %v != %v", ip.String(), c.LocalAddr().String()) } return nil } // we require that ipv4 be supported if err := testFamily("udp4", "127.0.0.1:0"); err != nil { t.Fatalf("failed to test socket options on IPv4: %v", err) } // IPv6 might not be supported so these will just log if err := testFamily("udp6", "[::1]:0"); err != nil { t.Logf("failed to test socket options on IPv6-only: %v", err) } if err := testFamily("udp", "[::1]:0"); err != nil { t.Logf("failed to test socket options on IPv6/IPv4: %v", err) } } func TestParseDstFromOOB(t *testing.T) { // dst is :ffff:100.100.100.100 oob := []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 100, 100, 100, 2, 0, 0, 0} dst := parseDstFromOOB(oob) dst4 := dst.To4() if dst4 == nil { t.Errorf("failed to parse IPv4 in IPv6: %v", dst) } else if dst4.String() != "100.100.100.100" { t.Errorf("unexpected IPv4: %v", dst4) } // dst is 2001:db8::1 oob = []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 32, 1, 13, 184, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0} dst = parseDstFromOOB(oob) dst6 := dst.To16() if dst6 == nil { t.Errorf("failed to parse IPv6: %v", dst) } else if dst6.String() != "2001:db8::1" { t.Errorf("unexpected IPv6: %v", dst4) } // dst is 100.100.100.100 but was received on 10.10.10.10 oob = []byte{28, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 2, 0, 0, 0, 10, 10, 10, 10, 100, 100, 100, 100, 0, 0, 0, 0} dst = parseDstFromOOB(oob) dst4 = dst.To4() if dst4 == nil { t.Errorf("failed to parse IPv4: %v", dst) } else if dst4.String() != "100.100.100.100" { t.Errorf("unexpected IPv4: %v", dst4) } } func TestCorrectSource(t *testing.T) { // dst is :ffff:100.100.100.100 which should be counted as IPv4 oob := []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 100, 100, 100, 2, 0, 0, 0} soob := correctSource(oob) cm4 := new(ipv4.ControlMessage) cm4.Src = net.ParseIP("100.100.100.100") if !bytes.Equal(soob, cm4.Marshal()) { t.Errorf("unexpected oob for ipv4 address: %v", soob) } // dst is 2001:db8::1 oob = []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 32, 1, 13, 184, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0} soob = correctSource(oob) cm6 := new(ipv6.ControlMessage) cm6.Src = net.ParseIP("2001:db8::1") if !bytes.Equal(soob, cm6.Marshal()) { t.Errorf("unexpected oob for IPv6 address: %v", soob) } }