// 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 ipv4_test import ( "bytes" "net" "os" "runtime" "testing" "time" "golang.org/x/net/icmp" "golang.org/x/net/internal/iana" "golang.org/x/net/internal/nettest" "golang.org/x/net/ipv4" ) var packetConnReadWriteMulticastUDPTests = []struct { addr string grp, src *net.UDPAddr }{ {"224.0.0.0:0", &net.UDPAddr{IP: net.IPv4(224, 0, 0, 254)}, nil}, // see RFC 4727 {"232.0.1.0:0", &net.UDPAddr{IP: net.IPv4(232, 0, 1, 254)}, &net.UDPAddr{IP: net.IPv4(127, 0, 0, 1)}}, // see RFC 5771 } func TestPacketConnReadWriteMulticastUDP(t *testing.T) { switch runtime.GOOS { case "nacl", "plan9", "solaris", "windows": t.Skipf("not supported on %s", runtime.GOOS) } ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagMulticast|net.FlagLoopback) if ifi == nil { t.Skipf("not available on %s", runtime.GOOS) } for _, tt := range packetConnReadWriteMulticastUDPTests { c, err := net.ListenPacket("udp4", tt.addr) if err != nil { t.Fatal(err) } defer c.Close() grp := *tt.grp grp.Port = c.LocalAddr().(*net.UDPAddr).Port p := ipv4.NewPacketConn(c) defer p.Close() if tt.src == nil { if err := p.JoinGroup(ifi, &grp); err != nil { t.Fatal(err) } defer p.LeaveGroup(ifi, &grp) } else { if err := p.JoinSourceSpecificGroup(ifi, &grp, tt.src); err != nil { switch runtime.GOOS { case "freebsd", "linux": default: // platforms that don't support IGMPv2/3 fail here t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } defer p.LeaveSourceSpecificGroup(ifi, &grp, tt.src) } if err := p.SetMulticastInterface(ifi); err != nil { t.Fatal(err) } if _, err := p.MulticastInterface(); err != nil { t.Fatal(err) } if err := p.SetMulticastLoopback(true); err != nil { t.Fatal(err) } if _, err := p.MulticastLoopback(); err != nil { t.Fatal(err) } cf := ipv4.FlagTTL | ipv4.FlagDst | ipv4.FlagInterface wb := []byte("HELLO-R-U-THERE") for i, toggle := range []bool{true, false, true} { if err := p.SetControlMessage(cf, toggle); err != nil { if nettest.ProtocolNotSupported(err) { t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } if err := p.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil { t.Fatal(err) } p.SetMulticastTTL(i + 1) if n, err := p.WriteTo(wb, nil, &grp); err != nil { t.Fatal(err) } else if n != len(wb) { t.Fatalf("got %v; want %v", n, len(wb)) } rb := make([]byte, 128) if n, _, _, err := p.ReadFrom(rb); err != nil { t.Fatal(err) } else if !bytes.Equal(rb[:n], wb) { t.Fatalf("got %v; want %v", rb[:n], wb) } } } } var packetConnReadWriteMulticastICMPTests = []struct { grp, src *net.IPAddr }{ {&net.IPAddr{IP: net.IPv4(224, 0, 0, 254)}, nil}, // see RFC 4727 {&net.IPAddr{IP: net.IPv4(232, 0, 1, 254)}, &net.IPAddr{IP: net.IPv4(127, 0, 0, 1)}}, // see RFC 5771 } func TestPacketConnReadWriteMulticastICMP(t *testing.T) { switch runtime.GOOS { case "nacl", "plan9", "solaris", "windows": t.Skipf("not supported on %s", runtime.GOOS) } if m, ok := nettest.SupportsRawIPSocket(); !ok { t.Skip(m) } ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagMulticast|net.FlagLoopback) if ifi == nil { t.Skipf("not available on %s", runtime.GOOS) } for _, tt := range packetConnReadWriteMulticastICMPTests { c, err := net.ListenPacket("ip4:icmp", "0.0.0.0") if err != nil { t.Fatal(err) } defer c.Close() p := ipv4.NewPacketConn(c) defer p.Close() if tt.src == nil { if err := p.JoinGroup(ifi, tt.grp); err != nil { t.Fatal(err) } defer p.LeaveGroup(ifi, tt.grp) } else { if err := p.JoinSourceSpecificGroup(ifi, tt.grp, tt.src); err != nil { switch runtime.GOOS { case "freebsd", "linux": default: // platforms that don't support IGMPv2/3 fail here t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } defer p.LeaveSourceSpecificGroup(ifi, tt.grp, tt.src) } if err := p.SetMulticastInterface(ifi); err != nil { t.Fatal(err) } if _, err := p.MulticastInterface(); err != nil { t.Fatal(err) } if err := p.SetMulticastLoopback(true); err != nil { t.Fatal(err) } if _, err := p.MulticastLoopback(); err != nil { t.Fatal(err) } cf := ipv4.FlagDst | ipv4.FlagInterface if runtime.GOOS != "solaris" { // Solaris never allows to modify ICMP properties. cf |= ipv4.FlagTTL } for i, toggle := range []bool{true, false, true} { wb, err := (&icmp.Message{ Type: ipv4.ICMPTypeEcho, Code: 0, Body: &icmp.Echo{ ID: os.Getpid() & 0xffff, Seq: i + 1, Data: []byte("HELLO-R-U-THERE"), }, }).Marshal(nil) if err != nil { t.Fatal(err) } if err := p.SetControlMessage(cf, toggle); err != nil { if nettest.ProtocolNotSupported(err) { t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } if err := p.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil { t.Fatal(err) } p.SetMulticastTTL(i + 1) if n, err := p.WriteTo(wb, nil, tt.grp); err != nil { t.Fatal(err) } else if n != len(wb) { t.Fatalf("got %v; want %v", n, len(wb)) } rb := make([]byte, 128) if n, _, _, err := p.ReadFrom(rb); err != nil { t.Fatal(err) } else { m, err := icmp.ParseMessage(iana.ProtocolICMP, rb[:n]) if err != nil { t.Fatal(err) } switch { case m.Type == ipv4.ICMPTypeEchoReply && m.Code == 0: // net.inet.icmp.bmcastecho=1 case m.Type == ipv4.ICMPTypeEcho && m.Code == 0: // net.inet.icmp.bmcastecho=0 default: t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0) } } } } } var rawConnReadWriteMulticastICMPTests = []struct { grp, src *net.IPAddr }{ {&net.IPAddr{IP: net.IPv4(224, 0, 0, 254)}, nil}, // see RFC 4727 {&net.IPAddr{IP: net.IPv4(232, 0, 1, 254)}, &net.IPAddr{IP: net.IPv4(127, 0, 0, 1)}}, // see RFC 5771 } func TestRawConnReadWriteMulticastICMP(t *testing.T) { if testing.Short() { t.Skip("to avoid external network") } if m, ok := nettest.SupportsRawIPSocket(); !ok { t.Skip(m) } ifi := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagMulticast|net.FlagLoopback) if ifi == nil { t.Skipf("not available on %s", runtime.GOOS) } for _, tt := range rawConnReadWriteMulticastICMPTests { c, err := net.ListenPacket("ip4:icmp", "0.0.0.0") if err != nil { t.Fatal(err) } defer c.Close() r, err := ipv4.NewRawConn(c) if err != nil { t.Fatal(err) } defer r.Close() if tt.src == nil { if err := r.JoinGroup(ifi, tt.grp); err != nil { t.Fatal(err) } defer r.LeaveGroup(ifi, tt.grp) } else { if err := r.JoinSourceSpecificGroup(ifi, tt.grp, tt.src); err != nil { switch runtime.GOOS { case "freebsd", "linux": default: // platforms that don't support IGMPv2/3 fail here t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } defer r.LeaveSourceSpecificGroup(ifi, tt.grp, tt.src) } if err := r.SetMulticastInterface(ifi); err != nil { t.Fatal(err) } if _, err := r.MulticastInterface(); err != nil { t.Fatal(err) } if err := r.SetMulticastLoopback(true); err != nil { t.Fatal(err) } if _, err := r.MulticastLoopback(); err != nil { t.Fatal(err) } cf := ipv4.FlagTTL | ipv4.FlagDst | ipv4.FlagInterface for i, toggle := range []bool{true, false, true} { wb, err := (&icmp.Message{ Type: ipv4.ICMPTypeEcho, Code: 0, Body: &icmp.Echo{ ID: os.Getpid() & 0xffff, Seq: i + 1, Data: []byte("HELLO-R-U-THERE"), }, }).Marshal(nil) if err != nil { t.Fatal(err) } wh := &ipv4.Header{ Version: ipv4.Version, Len: ipv4.HeaderLen, TOS: i + 1, TotalLen: ipv4.HeaderLen + len(wb), Protocol: 1, Dst: tt.grp.IP, } if err := r.SetControlMessage(cf, toggle); err != nil { if nettest.ProtocolNotSupported(err) { t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } if err := r.SetDeadline(time.Now().Add(200 * time.Millisecond)); err != nil { t.Fatal(err) } r.SetMulticastTTL(i + 1) if err := r.WriteTo(wh, wb, nil); err != nil { t.Fatal(err) } rb := make([]byte, ipv4.HeaderLen+128) if rh, b, _, err := r.ReadFrom(rb); err != nil { t.Fatal(err) } else { m, err := icmp.ParseMessage(iana.ProtocolICMP, b) if err != nil { t.Fatal(err) } switch { case (rh.Dst.IsLoopback() || rh.Dst.IsLinkLocalUnicast() || rh.Dst.IsGlobalUnicast()) && m.Type == ipv4.ICMPTypeEchoReply && m.Code == 0: // net.inet.icmp.bmcastecho=1 case rh.Dst.IsMulticast() && m.Type == ipv4.ICMPTypeEcho && m.Code == 0: // net.inet.icmp.bmcastecho=0 default: t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0) } } } } }