go.net/ipv4: new package
Package ipv4 implements IP-level socket options for the Internet
Protocol version 4. It also provides raw IP socket access methods
including IPv4 header manipulation.
Fixes golang/go#3684.
Fixes golang/go#3820.
This CL requires CL 6426047;
net: add read, write message methods to IPConn, UDPConn
R=rsc, dave, alex.brainman
CC=gobot, golang-dev
https://golang.org/cl/6482044
diff --git a/ipv4/header_test.go b/ipv4/header_test.go
new file mode 100644
index 0000000..0ac02ed
--- /dev/null
+++ b/ipv4/header_test.go
@@ -0,0 +1,99 @@
+// 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"
+ "code.google.com/p/go.net/ipv4"
+ "net"
+ "reflect"
+ "runtime"
+ "testing"
+)
+
+var (
+ wireHeaderFromKernel = [ipv4.HeaderLen]byte{
+ 0x45, 0x01, 0xbe, 0xef,
+ 0xca, 0xfe, 0x05, 0xdc,
+ 0xff, 0x01, 0xde, 0xad,
+ 172, 16, 254, 254,
+ 192, 168, 0, 1,
+ }
+ wireHeaderToKernel = [ipv4.HeaderLen]byte{
+ 0x45, 0x01, 0xbe, 0xef,
+ 0xca, 0xfe, 0x05, 0xdc,
+ 0xff, 0x01, 0xde, 0xad,
+ 172, 16, 254, 254,
+ 192, 168, 0, 1,
+ }
+ wireHeaderFromTradBSDKernel = [ipv4.HeaderLen]byte{
+ 0x45, 0x01, 0xdb, 0xbe,
+ 0xca, 0xfe, 0xdc, 0x05,
+ 0xff, 0x01, 0xde, 0xad,
+ 172, 16, 254, 254,
+ 192, 168, 0, 1,
+ }
+ wireHeaderToTradBSDKernel = [ipv4.HeaderLen]byte{
+ 0x45, 0x01, 0xef, 0xbe,
+ 0xca, 0xfe, 0xdc, 0x05,
+ 0xff, 0x01, 0xde, 0xad,
+ 172, 16, 254, 254,
+ 192, 168, 0, 1,
+ }
+ // TODO(mikio): Add platform dependent wire header formats when
+ // we support new platforms.
+)
+
+func testHeader() *ipv4.Header {
+ h := &ipv4.Header{}
+ h.Version = ipv4.Version
+ h.Len = ipv4.HeaderLen
+ h.TOS = 1
+ h.TotalLen = 0xbeef
+ h.ID = 0xcafe
+ h.FragOff = 1500
+ h.TTL = 255
+ h.Protocol = 1
+ h.Checksum = 0xdead
+ h.Src = net.IPv4(172, 16, 254, 254)
+ h.Dst = net.IPv4(192, 168, 0, 1)
+ return h
+}
+
+func TestMarshalHeader(t *testing.T) {
+ th := testHeader()
+ b, err := th.Marshal()
+ if err != nil {
+ t.Fatalf("ipv4.Header.Marshal failed: %v", err)
+ }
+ var wh []byte
+ switch runtime.GOOS {
+ case "linux", "openbsd":
+ wh = wireHeaderToKernel[:]
+ default:
+ wh = wireHeaderToTradBSDKernel[:]
+ }
+ if !bytes.Equal(b, wh) {
+ t.Fatalf("ipv4.Header.Marshal failed: %#v not equal %#v", b, wh)
+ }
+}
+
+func TestParseHeader(t *testing.T) {
+ var wh []byte
+ switch runtime.GOOS {
+ case "linux", "openbsd":
+ wh = wireHeaderFromKernel[:]
+ default:
+ wh = wireHeaderFromTradBSDKernel[:]
+ }
+ h, err := ipv4.ParseHeader(wh)
+ if err != nil {
+ t.Fatalf("ipv4.ParseHeader failed: %v", err)
+ }
+ th := testHeader()
+ if !reflect.DeepEqual(h, th) {
+ t.Fatalf("ipv4.ParseHeader failed: %#v not equal %#v", h, th)
+ }
+}
