| // 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) |
| } |
| // Skip this check on z/OS since net.Interfaces() does not return loopback, however |
| // this does not affect the test and it will still pass. |
| if _, err := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback); err != nil && runtime.GOOS != "zos" { |
| 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) |
| } |
| |
| backoff := time.Millisecond |
| for { |
| n, err := p.WriteTo(wb, nil, dst) |
| if err != nil { |
| if n == 0 && isENOBUFS(err) { |
| time.Sleep(backoff) |
| backoff *= 2 |
| continue |
| } |
| t.Fatal(err) |
| } |
| if n != len(wb) { |
| t.Fatalf("got %d; want %d", n, len(wb)) |
| } |
| break |
| } |
| |
| 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) |
| } |
| // Skip this check on z/OS since net.Interfaces() does not return loopback, however |
| // this does not affect the test and it will still pass. |
| if _, err := nettest.RoutedInterface("ip4", net.FlagUp|net.FlagLoopback); err != nil && runtime.GOOS != "zos" { |
| 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) |
| } |
| |
| backoff := time.Millisecond |
| for { |
| n, err := p.WriteTo(wb, nil, dst) |
| if err != nil { |
| if n == 0 && isENOBUFS(err) { |
| time.Sleep(backoff) |
| backoff *= 2 |
| continue |
| } |
| t.Fatal(err) |
| } |
| if n != len(wb) { |
| t.Fatalf("got %d; want %d", n, len(wb)) |
| } |
| break |
| } |
| |
| 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", "ios": // 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", "ios": // 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) |
| } |
| } |
| } |
| } |
