// 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/ipv4" "golang.org/x/net/nettest" ) func TestPacketConnReadWriteUnicastUDP(t *testing.T) { switch runtime.GOOS { case "fuchsia", "hurd", "js", "nacl", "plan9", "windows": t.Skipf("not supported on %s", runtime.GOOS) } if _, err := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback); err != nil { t.Skipf("not available on %s", runtime.GOOS) } c, err := nettest.NewLocalPacketListener("udp4") if err != nil { t.Fatal(err) } defer c.Close() p := ipv4.NewPacketConn(c) defer p.Close() dst := c.LocalAddr() 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 protocolNotSupported(err) { t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } p.SetTTL(i + 1) if err := p.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)); err != nil { t.Fatal(err) } if n, err := p.WriteTo(wb, nil, dst); err != nil { t.Fatal(err) } else if n != len(wb) { t.Fatalf("got %v; want %v", n, len(wb)) } rb := make([]byte, 128) if err := p.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil { t.Fatal(err) } 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) } } } func TestPacketConnReadWriteUnicastICMP(t *testing.T) { switch runtime.GOOS { case "fuchsia", "hurd", "js", "nacl", "plan9", "windows": t.Skipf("not supported on %s", runtime.GOOS) } if !nettest.SupportsRawSocket() { t.Skipf("not supported on %s/%s", runtime.GOOS, runtime.GOARCH) } if _, err := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback); err != nil { t.Skipf("not available on %s", runtime.GOOS) } c, err := net.ListenPacket("ip4:icmp", "0.0.0.0") if err != nil { t.Fatal(err) } defer c.Close() dst, err := net.ResolveIPAddr("ip4", "127.0.0.1") if err != nil { t.Fatal(err) } p := ipv4.NewPacketConn(c) defer p.Close() cf := ipv4.FlagDst | ipv4.FlagInterface if runtime.GOOS != "illumos" && runtime.GOOS != "solaris" { // Illumos and Solaris never allow modification of 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 protocolNotSupported(err) { t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } p.SetTTL(i + 1) if err := p.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)); err != nil { t.Fatal(err) } if n, err := p.WriteTo(wb, nil, dst); err != nil { t.Fatal(err) } else if n != len(wb) { t.Fatalf("got %v; want %v", n, len(wb)) } rb := make([]byte, 128) loop: if err := p.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil { t.Fatal(err) } if n, _, _, err := p.ReadFrom(rb); err != nil { switch runtime.GOOS { case "darwin": // older darwin kernels have some limitation on receiving icmp packet through raw socket t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } else { m, err := icmp.ParseMessage(iana.ProtocolICMP, rb[:n]) if err != nil { t.Fatal(err) } if runtime.GOOS == "linux" && m.Type == ipv4.ICMPTypeEcho { // On Linux we must handle own sent packets. goto loop } if m.Type != ipv4.ICMPTypeEchoReply || m.Code != 0 { t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0) } } } } func TestRawConnReadWriteUnicastICMP(t *testing.T) { switch runtime.GOOS { case "fuchsia", "hurd", "js", "nacl", "plan9", "windows": t.Skipf("not supported on %s", runtime.GOOS) } if !nettest.SupportsRawSocket() { t.Skipf("not supported on %s/%s", runtime.GOOS, runtime.GOARCH) } if _, err := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback); err != nil { t.Skipf("not available on %s", runtime.GOOS) } c, err := net.ListenPacket("ip4:icmp", "0.0.0.0") if err != nil { t.Fatal(err) } defer c.Close() dst, err := net.ResolveIPAddr("ip4", "127.0.0.1") if err != nil { t.Fatal(err) } r, err := ipv4.NewRawConn(c) if err != nil { t.Fatal(err) } defer r.Close() 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), TTL: i + 1, Protocol: 1, Dst: dst.IP, } if err := r.SetControlMessage(cf, toggle); err != nil { if protocolNotSupported(err) { t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } if err := r.SetWriteDeadline(time.Now().Add(100 * time.Millisecond)); err != nil { t.Fatal(err) } if err := r.WriteTo(wh, wb, nil); err != nil { t.Fatal(err) } rb := make([]byte, ipv4.HeaderLen+128) loop: if err := r.SetReadDeadline(time.Now().Add(100 * time.Millisecond)); err != nil { t.Fatal(err) } if _, b, _, err := r.ReadFrom(rb); err != nil { switch runtime.GOOS { case "darwin": // older darwin kernels have some limitation on receiving icmp packet through raw socket t.Logf("not supported on %s", runtime.GOOS) continue } t.Fatal(err) } else { m, err := icmp.ParseMessage(iana.ProtocolICMP, b) if err != nil { t.Fatal(err) } if runtime.GOOS == "linux" && m.Type == ipv4.ICMPTypeEcho { // On Linux we must handle own sent packets. goto loop } if m.Type != ipv4.ICMPTypeEchoReply || m.Code != 0 { t.Fatalf("got type=%v, code=%v; want type=%v, code=%v", m.Type, m.Code, ipv4.ICMPTypeEchoReply, 0) } } } }