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/multicastsockopt_test.go b/ipv4/multicastsockopt_test.go
new file mode 100644
index 0000000..3f22739
--- /dev/null
+++ b/ipv4/multicastsockopt_test.go
@@ -0,0 +1,129 @@
+// 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.
+
+// +build darwin freebsd linux netbsd openbsd windows
+
+package ipv4_test
+
+import (
+ "code.google.com/p/go.net/ipv4"
+ "net"
+ "os"
+ "runtime"
+ "testing"
+)
+
+type testMulticastConn interface {
+ testUnicastConn
+ MulticastTTL() (int, error)
+ SetMulticastTTL(ttl int) error
+ MulticastLoopback() (bool, error)
+ SetMulticastLoopback(bool) error
+ JoinGroup(*net.Interface, net.Addr) error
+ LeaveGroup(*net.Interface, net.Addr) error
+}
+
+type multicastSockoptTest struct {
+ tos int
+ ttl int
+ mcttl int
+ mcloop bool
+ gaddr net.IP
+}
+
+var multicastSockoptTests = []multicastSockoptTest{
+ {ipv4.DSCP_CS0 | ipv4.ECN_NOTECT, 127, 128, false, net.IPv4(224, 0, 0, 249)}, // see RFC 4727
+ {ipv4.DSCP_AF11 | ipv4.ECN_NOTECT, 255, 254, true, net.IPv4(224, 0, 0, 250)}, // see RFC 4727
+}
+
+func TestUDPMulticastSockopt(t *testing.T) {
+ if testing.Short() || !*testExternal {
+ t.Logf("skipping test to avoid external network")
+ return
+ }
+
+ for _, tt := range multicastSockoptTests {
+ c, err := net.ListenPacket("udp4", "0.0.0.0:0")
+ if err != nil {
+ t.Fatalf("net.ListenPacket failed: %v", err)
+ }
+ defer c.Close()
+
+ p := ipv4.NewPacketConn(c)
+ testMulticastSockopt(t, tt, p, &net.UDPAddr{IP: tt.gaddr})
+ }
+}
+
+func TestIPMulticastSockopt(t *testing.T) {
+ if testing.Short() || !*testExternal {
+ t.Logf("skipping test to avoid external network")
+ return
+ }
+ if os.Getuid() != 0 {
+ t.Logf("skipping test; must be root")
+ return
+ }
+
+ for _, tt := range multicastSockoptTests {
+ c, err := net.ListenPacket("ip4:icmp", "0.0.0.0")
+ if err != nil {
+ t.Fatalf("net.ListenPacket failed: %v", err)
+ }
+ defer c.Close()
+
+ r, _ := ipv4.NewRawConn(c)
+ testMulticastSockopt(t, tt, r, &net.IPAddr{IP: tt.gaddr})
+ }
+}
+
+func testMulticastSockopt(t *testing.T, tt multicastSockoptTest, c testMulticastConn, gaddr net.Addr) {
+ switch runtime.GOOS {
+ case "windows":
+ // IP_TOS option is supported on Windows 8 and beyond.
+ t.Logf("skipping IP_TOS test on %q", runtime.GOOS)
+ default:
+ if err := c.SetTOS(tt.tos); err != nil {
+ t.Fatalf("ipv4.PacketConn.SetTOS failed: %v", err)
+ }
+ if v, err := c.TOS(); err != nil {
+ t.Fatalf("ipv4.PacketConn.TOS failed: %v", err)
+ } else if v != tt.tos {
+ t.Fatalf("Got unexpected TOS value %v; expected %v", v, tt.tos)
+ }
+ }
+
+ if err := c.SetTTL(tt.ttl); err != nil {
+ t.Fatalf("ipv4.PacketConn.SetTTL failed: %v", err)
+ }
+ if v, err := c.TTL(); err != nil {
+ t.Fatalf("ipv4.PacketConn.TTL failed: %v", err)
+ } else if v != tt.ttl {
+ t.Fatalf("Got unexpected TTL value %v; expected %v", v, tt.ttl)
+ }
+
+ if err := c.SetMulticastTTL(tt.mcttl); err != nil {
+ t.Fatalf("ipv4.PacketConn.SetMulticastTTL failed: %v", err)
+ }
+ if v, err := c.MulticastTTL(); err != nil {
+ t.Fatalf("ipv4.PacketConn.MulticastTTL failed: %v", err)
+ } else if v != tt.mcttl {
+ t.Fatalf("Got unexpected MulticastTTL value %v; expected %v", v, tt.mcttl)
+ }
+
+ if err := c.SetMulticastLoopback(tt.mcloop); err != nil {
+ t.Fatalf("ipv4.PacketConn.SetMulticastLoopback failed: %v", err)
+ }
+ if v, err := c.MulticastLoopback(); err != nil {
+ t.Fatalf("ipv4.PacketConn.MulticastLoopback failed: %v", err)
+ } else if v != tt.mcloop {
+ t.Fatalf("Got unexpected MulticastLoopback value %v; expected %v", v, tt.mcloop)
+ }
+
+ if err := c.JoinGroup(nil, gaddr); err != nil {
+ t.Fatalf("ipv4.PacketConn.JoinGroup(%v) failed: %v", gaddr, err)
+ }
+ if err := c.LeaveGroup(nil, gaddr); err != nil {
+ t.Fatalf("ipv4.PacketConn.LeaveGroup(%v) failed: %v", gaddr, err)
+ }
+}
