Commit e4820bcf authored by Chris McGee's avatar Chris McGee Committed by Brad Fitzpatrick

net: add multicast UDP support for plan9

The new implementation adds listening support on a multicast
address with plan9 network interfaces.

Fixes #17218

Change-Id: I2c75515e72e120acb71610cd077fddfbf9cf4e29
Reviewed-on: https://go-review.googlesource.com/29964Reviewed-by: default avatarBrad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
parent a7c84668
...@@ -15,7 +15,7 @@ import ( ...@@ -15,7 +15,7 @@ import (
// BUG(mikio): On Windows, the File method of UDPConn is not // BUG(mikio): On Windows, the File method of UDPConn is not
// implemented. // implemented.
// BUG(mikio): On NaCl and Plan 9, the ListenMulticastUDP function is // BUG(mikio): On NaCl the ListenMulticastUDP function is
// not implemented. // not implemented.
// UDPAddr represents the address of a UDP end point. // UDPAddr represents the address of a UDP end point.
......
...@@ -109,5 +109,41 @@ func listenUDP(ctx context.Context, network string, laddr *UDPAddr) (*UDPConn, e ...@@ -109,5 +109,41 @@ func listenUDP(ctx context.Context, network string, laddr *UDPAddr) (*UDPConn, e
} }
func listenMulticastUDP(ctx context.Context, network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) { func listenMulticastUDP(ctx context.Context, network string, ifi *Interface, gaddr *UDPAddr) (*UDPConn, error) {
return nil, syscall.EPLAN9 l, err := listenPlan9(ctx, network, gaddr)
if err != nil {
return nil, err
}
_, err = l.ctl.WriteString("headers")
if err != nil {
return nil, err
}
var addrs []Addr
if ifi != nil {
addrs, err = ifi.Addrs()
if err != nil {
return nil, err
}
} else {
addrs, err = InterfaceAddrs()
if err != nil {
return nil, err
}
}
for _, addr := range addrs {
if ipnet, ok := addr.(*IPNet); ok {
_, err = l.ctl.WriteString("addmulti " + ipnet.IP.String() + " " + gaddr.IP.String())
if err != nil {
return nil, err
}
}
}
l.data, err = os.OpenFile(l.dir+"/data", os.O_RDWR, 0)
if err != nil {
return nil, err
}
fd, err := l.netFD()
if err != nil {
return nil, err
}
return newUDPConn(fd), nil
} }
// Copyright 2016 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 net
import (
"internal/testenv"
"runtime"
"testing"
)
func TestListenMulticastUDP(t *testing.T) {
testenv.MustHaveExternalNetwork(t)
ifcs, err := Interfaces()
if err != nil {
t.Skip(err.Error())
}
if len(ifcs) == 0 {
t.Skip("no network interfaces found")
}
var mifc *Interface
for _, ifc := range ifcs {
if ifc.Flags&FlagUp|FlagMulticast != FlagUp|FlagMulticast {
continue
}
mifc = &ifc
break
}
if mifc == nil {
t.Skipf("no multicast interfaces found")
}
c1, err := ListenMulticastUDP("udp4", mifc, &UDPAddr{IP: ParseIP("224.0.0.254")})
if err != nil {
t.Fatalf("multicast not working on %s", runtime.GOOS)
}
c1addr := c1.LocalAddr().(*UDPAddr)
if err != nil {
t.Fatal(err)
}
defer c1.Close()
c2, err := ListenUDP("udp4", &UDPAddr{IP: IPv4zero, Port: 0})
c2addr := c2.LocalAddr().(*UDPAddr)
if err != nil {
t.Fatal(err)
}
defer c2.Close()
n, err := c2.WriteToUDP([]byte("data"), c1addr)
if err != nil {
t.Fatal(err)
}
if n != 4 {
t.Fatalf("got %d; want 4", n)
}
n, err = c1.WriteToUDP([]byte("data"), c2addr)
if err != nil {
t.Fatal(err)
}
if n != 4 {
t.Fatalf("got %d; want 4", n)
}
}
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