// Copyright 2012 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package net import ( "errors" "fmt" "internal/testenv" "net/netip" "os" "reflect" "runtime" "testing" "time" ) func BenchmarkUDP6LinkLocalUnicast(b *testing.B) { testHookUninstaller.Do(uninstallTestHooks) if !supportsIPv6() { b.Skip("IPv6 is not supported") } ifi := loopbackInterface() if ifi == nil { b.Skip("loopback interface not found") } lla := ipv6LinkLocalUnicastAddr(ifi) if lla == "" { b.Skip("IPv6 link-local unicast address not found") } c1, err := ListenPacket("udp6", JoinHostPort(lla+"%"+ifi.Name, "0")) if err != nil { b.Fatal(err) } defer c1.Close() c2, err := ListenPacket("udp6", JoinHostPort(lla+"%"+ifi.Name, "0")) if err != nil { b.Fatal(err) } defer c2.Close() var buf [1]byte for i := 0; i < b.N; i++ { if _, err := c1.WriteTo(buf[:], c2.LocalAddr()); err != nil { b.Fatal(err) } if _, _, err := c2.ReadFrom(buf[:]); err != nil { b.Fatal(err) } } } type resolveUDPAddrTest struct { network string litAddrOrName string addr *UDPAddr err error } var resolveUDPAddrTests = []resolveUDPAddrTest{ {"udp", "127.0.0.1:0", &UDPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil}, {"udp4", "127.0.0.1:65535", &UDPAddr{IP: IPv4(127, 0, 0, 1), Port: 65535}, nil}, {"udp", "[::1]:0", &UDPAddr{IP: ParseIP("::1"), Port: 0}, nil}, {"udp6", "[::1]:65535", &UDPAddr{IP: ParseIP("::1"), Port: 65535}, nil}, {"udp", "[::1%en0]:1", &UDPAddr{IP: ParseIP("::1"), Port: 1, Zone: "en0"}, nil}, {"udp6", "[::1%911]:2", &UDPAddr{IP: ParseIP("::1"), Port: 2, Zone: "911"}, nil}, {"", "127.0.0.1:0", &UDPAddr{IP: IPv4(127, 0, 0, 1), Port: 0}, nil}, // Go 1.0 behavior {"", "[::1]:0", &UDPAddr{IP: ParseIP("::1"), Port: 0}, nil}, // Go 1.0 behavior {"udp", ":12345", &UDPAddr{Port: 12345}, nil}, {"http", "127.0.0.1:0", nil, UnknownNetworkError("http")}, {"udp", "127.0.0.1:domain", &UDPAddr{IP: ParseIP("127.0.0.1"), Port: 53}, nil}, {"udp", "[::ffff:127.0.0.1]:domain", &UDPAddr{IP: ParseIP("::ffff:127.0.0.1"), Port: 53}, nil}, {"udp", "[2001:db8::1]:domain", &UDPAddr{IP: ParseIP("2001:db8::1"), Port: 53}, nil}, {"udp4", "127.0.0.1:domain", &UDPAddr{IP: ParseIP("127.0.0.1"), Port: 53}, nil}, {"udp4", "[::ffff:127.0.0.1]:domain", &UDPAddr{IP: ParseIP("127.0.0.1"), Port: 53}, nil}, {"udp6", "[2001:db8::1]:domain", &UDPAddr{IP: ParseIP("2001:db8::1"), Port: 53}, nil}, {"udp4", "[2001:db8::1]:domain", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "2001:db8::1"}}, {"udp6", "127.0.0.1:domain", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "127.0.0.1"}}, {"udp6", "[::ffff:127.0.0.1]:domain", nil, &AddrError{Err: errNoSuitableAddress.Error(), Addr: "::ffff:127.0.0.1"}}, } func TestResolveUDPAddr(t *testing.T) { origTestHookLookupIP := testHookLookupIP defer func() { testHookLookupIP = origTestHookLookupIP }() testHookLookupIP = lookupLocalhost for _, tt := range resolveUDPAddrTests { addr, err := ResolveUDPAddr(tt.network, tt.litAddrOrName) if !reflect.DeepEqual(addr, tt.addr) || !reflect.DeepEqual(err, tt.err) { t.Errorf("ResolveUDPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr, err, tt.addr, tt.err) continue } if err == nil { addr2, err := ResolveUDPAddr(addr.Network(), addr.String()) if !reflect.DeepEqual(addr2, tt.addr) || err != tt.err { t.Errorf("(%q, %q): ResolveUDPAddr(%q, %q) = %#v, %v, want %#v, %v", tt.network, tt.litAddrOrName, addr.Network(), addr.String(), addr2, err, tt.addr, tt.err) } } } } func TestWriteToUDP(t *testing.T) { switch runtime.GOOS { case "plan9": t.Skipf("not supported on %s", runtime.GOOS) } if !testableNetwork("udp") { t.Skipf("skipping: udp not supported") } c, err := ListenPacket("udp", "127.0.0.1:0") if err != nil { t.Fatal(err) } defer c.Close() testWriteToConn(t, c.LocalAddr().String()) testWriteToPacketConn(t, c.LocalAddr().String()) } func testWriteToConn(t *testing.T, raddr string) { c, err := Dial("udp", raddr) if err != nil { t.Fatal(err) } defer c.Close() ra, err := ResolveUDPAddr("udp", raddr) if err != nil { t.Fatal(err) } b := []byte("CONNECTED-MODE SOCKET") _, err = c.(*UDPConn).WriteToUDP(b, ra) if err == nil { t.Fatal("should fail") } if err != nil && err.(*OpError).Err != ErrWriteToConnected { t.Fatalf("should fail as ErrWriteToConnected: %v", err) } _, err = c.(*UDPConn).WriteTo(b, ra) if err == nil { t.Fatal("should fail") } if err != nil && err.(*OpError).Err != ErrWriteToConnected { t.Fatalf("should fail as ErrWriteToConnected: %v", err) } _, err = c.Write(b) if err != nil { t.Fatal(err) } _, _, err = c.(*UDPConn).WriteMsgUDP(b, nil, ra) if err == nil { t.Fatal("should fail") } if err != nil && err.(*OpError).Err != ErrWriteToConnected { t.Fatalf("should fail as ErrWriteToConnected: %v", err) } _, _, err = c.(*UDPConn).WriteMsgUDP(b, nil, nil) if err != nil { t.Fatal(err) } } func testWriteToPacketConn(t *testing.T, raddr string) { c, err := ListenPacket("udp", "127.0.0.1:0") if err != nil { t.Fatal(err) } defer c.Close() ra, err := ResolveUDPAddr("udp", raddr) if err != nil { t.Fatal(err) } b := []byte("UNCONNECTED-MODE SOCKET") _, err = c.(*UDPConn).WriteToUDP(b, ra) if err != nil { t.Fatal(err) } _, err = c.WriteTo(b, ra) if err != nil { t.Fatal(err) } _, err = c.(*UDPConn).Write(b) if err == nil { t.Fatal("should fail") } _, _, err = c.(*UDPConn).WriteMsgUDP(b, nil, nil) if err == nil { t.Fatal("should fail") } if err != nil && err.(*OpError).Err != errMissingAddress { t.Fatalf("should fail as errMissingAddress: %v", err) } _, _, err = c.(*UDPConn).WriteMsgUDP(b, nil, ra) if err != nil { t.Fatal(err) } } var udpConnLocalNameTests = []struct { net string laddr *UDPAddr }{ {"udp4", &UDPAddr{IP: IPv4(127, 0, 0, 1)}}, {"udp4", &UDPAddr{}}, {"udp4", nil}, } func TestUDPConnLocalName(t *testing.T) { testenv.MustHaveExternalNetwork(t) for _, tt := range udpConnLocalNameTests { t.Run(fmt.Sprint(tt.laddr), func(t *testing.T) { if !testableNetwork(tt.net) { t.Skipf("skipping: %s not available", tt.net) } c, err := ListenUDP(tt.net, tt.laddr) if err != nil { t.Fatal(err) } defer c.Close() la := c.LocalAddr() if a, ok := la.(*UDPAddr); !ok || a.Port == 0 { t.Fatalf("got %v; expected a proper address with non-zero port number", la) } }) } } func TestUDPConnLocalAndRemoteNames(t *testing.T) { if !testableNetwork("udp") { t.Skipf("skipping: udp not available") } for _, laddr := range []string{"", "127.0.0.1:0"} { c1, err := ListenPacket("udp", "127.0.0.1:0") if err != nil { t.Fatal(err) } defer c1.Close() var la *UDPAddr if laddr != "" { var err error if la, err = ResolveUDPAddr("udp", laddr); err != nil { t.Fatal(err) } } c2, err := DialUDP("udp", la, c1.LocalAddr().(*UDPAddr)) if err != nil { t.Fatal(err) } defer c2.Close() var connAddrs = [4]struct { got Addr ok bool }{ {c1.LocalAddr(), true}, {c1.(*UDPConn).RemoteAddr(), false}, {c2.LocalAddr(), true}, {c2.RemoteAddr(), true}, } for _, ca := range connAddrs { if a, ok := ca.got.(*UDPAddr); ok != ca.ok || ok && a.Port == 0 { t.Fatalf("got %v; expected a proper address with non-zero port number", ca.got) } } } } func TestIPv6LinkLocalUnicastUDP(t *testing.T) { testenv.MustHaveExternalNetwork(t) if !supportsIPv6() { t.Skip("IPv6 is not supported") } for i, tt := range ipv6LinkLocalUnicastUDPTests { c1, err := ListenPacket(tt.network, tt.address) if err != nil { // It might return "LookupHost returned no // suitable address" error on some platforms. t.Log(err) continue } ls := (&packetListener{PacketConn: c1}).newLocalServer() defer ls.teardown() ch := make(chan error, 1) handler := func(ls *localPacketServer, c PacketConn) { packetTransponder(c, ch) } if err := ls.buildup(handler); err != nil { t.Fatal(err) } if la, ok := c1.LocalAddr().(*UDPAddr); !ok || !tt.nameLookup && la.Zone == "" { t.Fatalf("got %v; expected a proper address with zone identifier", la) } c2, err := Dial(tt.network, ls.PacketConn.LocalAddr().String()) if err != nil { t.Fatal(err) } defer c2.Close() if la, ok := c2.LocalAddr().(*UDPAddr); !ok || !tt.nameLookup && la.Zone == "" { t.Fatalf("got %v; expected a proper address with zone identifier", la) } if ra, ok := c2.RemoteAddr().(*UDPAddr); !ok || !tt.nameLookup && ra.Zone == "" { t.Fatalf("got %v; expected a proper address with zone identifier", ra) } if _, err := c2.Write([]byte("UDP OVER IPV6 LINKLOCAL TEST")); err != nil { t.Fatal(err) } b := make([]byte, 32) if _, err := c2.Read(b); err != nil { t.Fatal(err) } for err := range ch { t.Errorf("#%d: %v", i, err) } } } func TestUDPZeroBytePayload(t *testing.T) { switch runtime.GOOS { case "plan9": t.Skipf("not supported on %s", runtime.GOOS) case "darwin", "ios": testenv.SkipFlaky(t, 29225) } if !testableNetwork("udp") { t.Skipf("skipping: udp not available") } c := newLocalPacketListener(t, "udp") defer c.Close() for _, genericRead := range []bool{false, true} { n, err := c.WriteTo(nil, c.LocalAddr()) if err != nil { t.Fatal(err) } if n != 0 { t.Errorf("got %d; want 0", n) } c.SetReadDeadline(time.Now().Add(30 * time.Second)) var b [1]byte var name string if genericRead { _, err = c.(Conn).Read(b[:]) name = "Read" } else { _, _, err = c.ReadFrom(b[:]) name = "ReadFrom" } if err != nil { t.Errorf("%s of zero byte packet failed: %v", name, err) } } } func TestUDPZeroByteBuffer(t *testing.T) { switch runtime.GOOS { case "plan9": t.Skipf("not supported on %s", runtime.GOOS) } if !testableNetwork("udp") { t.Skipf("skipping: udp not available") } c := newLocalPacketListener(t, "udp") defer c.Close() b := []byte("UDP ZERO BYTE BUFFER TEST") for _, genericRead := range []bool{false, true} { n, err := c.WriteTo(b, c.LocalAddr()) if err != nil { t.Fatal(err) } if n != len(b) { t.Errorf("got %d; want %d", n, len(b)) } c.SetReadDeadline(time.Now().Add(100 * time.Millisecond)) if genericRead { _, err = c.(Conn).Read(nil) } else { _, _, err = c.ReadFrom(nil) } switch err { case nil: // ReadFrom succeeds default: // Read may timeout, it depends on the platform if nerr, ok := err.(Error); (!ok || !nerr.Timeout()) && runtime.GOOS != "windows" { // Windows returns WSAEMSGSIZE t.Fatal(err) } } } } func TestUDPReadSizeError(t *testing.T) { switch runtime.GOOS { case "plan9": t.Skipf("not supported on %s", runtime.GOOS) } if !testableNetwork("udp") { t.Skipf("skipping: udp not available") } c1 := newLocalPacketListener(t, "udp") defer c1.Close() c2, err := Dial("udp", c1.LocalAddr().String()) if err != nil { t.Fatal(err) } defer c2.Close() b1 := []byte("READ SIZE ERROR TEST") for _, genericRead := range []bool{false, true} { n, err := c2.Write(b1) if err != nil { t.Fatal(err) } if n != len(b1) { t.Errorf("got %d; want %d", n, len(b1)) } b2 := make([]byte, len(b1)-1) if genericRead { n, err = c1.(Conn).Read(b2) } else { n, _, err = c1.ReadFrom(b2) } if err != nil && runtime.GOOS != "windows" { // Windows returns WSAEMSGSIZE t.Fatal(err) } if n != len(b1)-1 { t.Fatalf("got %d; want %d", n, len(b1)-1) } } } // TestUDPReadTimeout verifies that ReadFromUDP with timeout returns an error // without data or an address. func TestUDPReadTimeout(t *testing.T) { if !testableNetwork("udp4") { t.Skipf("skipping: udp4 not available") } la, err := ResolveUDPAddr("udp4", "127.0.0.1:0") if err != nil { t.Fatal(err) } c, err := ListenUDP("udp4", la) if err != nil { t.Fatal(err) } defer c.Close() c.SetDeadline(time.Now()) b := make([]byte, 1) n, addr, err := c.ReadFromUDP(b) if !errors.Is(err, os.ErrDeadlineExceeded) { t.Errorf("ReadFromUDP got err %v want os.ErrDeadlineExceeded", err) } if n != 0 { t.Errorf("ReadFromUDP got n %d want 0", n) } if addr != nil { t.Errorf("ReadFromUDP got addr %+#v want nil", addr) } } func TestAllocs(t *testing.T) { switch runtime.GOOS { case "plan9", "js", "wasip1": // These implementations have not been optimized. t.Skipf("skipping on %v", runtime.GOOS) } if !testableNetwork("udp4") { t.Skipf("skipping: udp4 not available") } // Optimizations are required to remove the allocs. testenv.SkipIfOptimizationOff(t) conn, err := ListenUDP("udp4", &UDPAddr{IP: IPv4(127, 0, 0, 1)}) if err != nil { t.Fatal(err) } defer conn.Close() addr := conn.LocalAddr() addrPort := addr.(*UDPAddr).AddrPort() buf := make([]byte, 8) allocs := testing.AllocsPerRun(1000, func() { _, _, err := conn.WriteMsgUDPAddrPort(buf, nil, addrPort) if err != nil { t.Fatal(err) } _, _, _, _, err = conn.ReadMsgUDPAddrPort(buf, nil) if err != nil { t.Fatal(err) } }) if got := int(allocs); got != 0 { t.Errorf("WriteMsgUDPAddrPort/ReadMsgUDPAddrPort allocated %d objects", got) } allocs = testing.AllocsPerRun(1000, func() { _, err := conn.WriteToUDPAddrPort(buf, addrPort) if err != nil { t.Fatal(err) } _, _, err = conn.ReadFromUDPAddrPort(buf) if err != nil { t.Fatal(err) } }) if got := int(allocs); got != 0 { t.Errorf("WriteToUDPAddrPort/ReadFromUDPAddrPort allocated %d objects", got) } allocs = testing.AllocsPerRun(1000, func() { _, err := conn.WriteTo(buf, addr) if err != nil { t.Fatal(err) } _, _, err = conn.ReadFromUDP(buf) if err != nil { t.Fatal(err) } }) if got := int(allocs); got != 1 { t.Errorf("WriteTo/ReadFromUDP allocated %d objects", got) } } func BenchmarkReadWriteMsgUDPAddrPort(b *testing.B) { conn, err := ListenUDP("udp4", &UDPAddr{IP: IPv4(127, 0, 0, 1)}) if err != nil { b.Fatal(err) } defer conn.Close() addr := conn.LocalAddr().(*UDPAddr).AddrPort() buf := make([]byte, 8) b.ResetTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { _, _, err := conn.WriteMsgUDPAddrPort(buf, nil, addr) if err != nil { b.Fatal(err) } _, _, _, _, err = conn.ReadMsgUDPAddrPort(buf, nil) if err != nil { b.Fatal(err) } } } func BenchmarkWriteToReadFromUDP(b *testing.B) { conn, err := ListenUDP("udp4", &UDPAddr{IP: IPv4(127, 0, 0, 1)}) if err != nil { b.Fatal(err) } defer conn.Close() addr := conn.LocalAddr() buf := make([]byte, 8) b.ResetTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { _, err := conn.WriteTo(buf, addr) if err != nil { b.Fatal(err) } _, _, err = conn.ReadFromUDP(buf) if err != nil { b.Fatal(err) } } } func BenchmarkWriteToReadFromUDPAddrPort(b *testing.B) { conn, err := ListenUDP("udp4", &UDPAddr{IP: IPv4(127, 0, 0, 1)}) if err != nil { b.Fatal(err) } defer conn.Close() addr := conn.LocalAddr().(*UDPAddr).AddrPort() buf := make([]byte, 8) b.ResetTimer() b.ReportAllocs() for i := 0; i < b.N; i++ { _, err := conn.WriteToUDPAddrPort(buf, addr) if err != nil { b.Fatal(err) } _, _, err = conn.ReadFromUDPAddrPort(buf) if err != nil { b.Fatal(err) } } } func TestUDPIPVersionReadMsg(t *testing.T) { switch runtime.GOOS { case "plan9": t.Skipf("skipping on %v", runtime.GOOS) } if !testableNetwork("udp4") { t.Skipf("skipping: udp4 not available") } conn, err := ListenUDP("udp4", &UDPAddr{IP: IPv4(127, 0, 0, 1)}) if err != nil { t.Fatal(err) } defer conn.Close() daddr := conn.LocalAddr().(*UDPAddr).AddrPort() buf := make([]byte, 8) _, err = conn.WriteToUDPAddrPort(buf, daddr) if err != nil { t.Fatal(err) } _, _, _, saddr, err := conn.ReadMsgUDPAddrPort(buf, nil) if err != nil { t.Fatal(err) } if !saddr.Addr().Is4() { t.Error("returned AddrPort is not IPv4") } _, err = conn.WriteToUDPAddrPort(buf, daddr) if err != nil { t.Fatal(err) } _, _, _, soldaddr, err := conn.ReadMsgUDP(buf, nil) if err != nil { t.Fatal(err) } if len(soldaddr.IP) != 4 { t.Error("returned UDPAddr is not IPv4") } } // TestIPv6WriteMsgUDPAddrPortTargetAddrIPVersion verifies that // WriteMsgUDPAddrPort accepts IPv4, IPv4-mapped IPv6, and IPv6 target addresses // on a UDPConn listening on "::". func TestIPv6WriteMsgUDPAddrPortTargetAddrIPVersion(t *testing.T) { if !testableNetwork("udp4") { t.Skipf("skipping: udp4 not available") } if !testableNetwork("udp6") { t.Skipf("skipping: udp6 not available") } switch runtime.GOOS { case "dragonfly", "openbsd": // DragonflyBSD's IPv6 sockets are always IPv6-only, according to the man page: // https://www.dragonflybsd.org/cgi/web-man?command=ip6 (search for IPV6_V6ONLY). // OpenBSD's IPv6 sockets are always IPv6-only, according to the man page: // https://man.openbsd.org/ip6#IPV6_V6ONLY t.Skipf("skipping on %v", runtime.GOOS) } conn, err := ListenUDP("udp", nil) if err != nil { t.Fatal(err) } defer conn.Close() daddr4 := netip.AddrPortFrom(netip.MustParseAddr("127.0.0.1"), 12345) daddr4in6 := netip.AddrPortFrom(netip.MustParseAddr("::ffff:127.0.0.1"), 12345) daddr6 := netip.AddrPortFrom(netip.MustParseAddr("::1"), 12345) buf := make([]byte, 8) _, _, err = conn.WriteMsgUDPAddrPort(buf, nil, daddr4) if err != nil { t.Fatal(err) } _, _, err = conn.WriteMsgUDPAddrPort(buf, nil, daddr4in6) if err != nil { t.Fatal(err) } _, _, err = conn.WriteMsgUDPAddrPort(buf, nil, daddr6) if err != nil { t.Fatal(err) } }