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// Copyright 2009 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 (
"flag"
"io"
"os"
"strings"
"syscall"
"testing"
"runtime"
)
// Do not test empty datagrams by default.
// It causes unexplained timeouts on some systems,
// including Snow Leopard. I think that the kernel
// doesn't quite expect them.
var testUDP = flag.Bool("udp", false, "whether to test UDP datagrams")
func runEcho(fd io.ReadWriter, done chan<- int) {
var buf [1024]byte
for {
n, err := fd.Read(buf[0:])
if err != nil || n == 0 {
break
}
fd.Write(buf[0:n])
}
done <- 1
}
func runServe(t *testing.T, network, addr string, listening chan<- string, done chan<- int) {
l, err := Listen(network, addr)
if err != nil {
t.Fatalf("net.Listen(%q, %q) = _, %v", network, addr, err)
}
listening <- l.Addr().String()
for {
fd, err := l.Accept()
if err != nil {
break
}
echodone := make(chan int)
go runEcho(fd, echodone)
<-echodone // make sure Echo stops
l.Close()
}
done <- 1
}
func connect(t *testing.T, network, addr string, isEmpty bool) {
var laddr string
if network == "unixgram" {
laddr = addr + ".local"
}
fd, err := Dial(network, laddr, addr)
if err != nil {
t.Fatalf("net.Dial(%q, %q, %q) = _, %v", network, laddr, addr, err)
}
fd.SetReadTimeout(1e9) // 1s
var b []byte
if !isEmpty {
b = []byte("hello, world\n")
}
var b1 [100]byte
n, err1 := fd.Write(b)
if n != len(b) {
t.Fatalf("fd.Write(%q) = %d, %v", b, n, err1)
}
n, err1 = fd.Read(b1[0:])
if n != len(b) || err1 != nil {
t.Fatalf("fd.Read() = %d, %v (want %d, nil)", n, err1, len(b))
}
fd.Close()
}
func doTest(t *testing.T, network, listenaddr, dialaddr string) {
t.Logf("Test %s %s %s\n", network, listenaddr, dialaddr)
listening := make(chan string)
done := make(chan int)
if network == "tcp" {
listenaddr += ":0" // any available port
}
go runServe(t, network, listenaddr, listening, done)
addr := <-listening // wait for server to start
if network == "tcp" {
dialaddr += addr[strings.LastIndex(addr, ":"):]
}
connect(t, network, dialaddr, false)
<-done // make sure server stopped
}
func TestTCPServer(t *testing.T) {
doTest(t, "tcp", "0.0.0.0", "127.0.0.1")
doTest(t, "tcp", "", "127.0.0.1")
if kernelSupportsIPv6() {
doTest(t, "tcp", "[::]", "[::ffff:127.0.0.1]")
doTest(t, "tcp", "[::]", "127.0.0.1")
doTest(t, "tcp", "0.0.0.0", "[::ffff:127.0.0.1]")
}
}
func TestUnixServer(t *testing.T) {
// "unix" sockets are not supported on windows.
if runtime.GOOS == "windows" {
return
}
os.Remove("/tmp/gotest.net")
doTest(t, "unix", "/tmp/gotest.net", "/tmp/gotest.net")
os.Remove("/tmp/gotest.net")
if syscall.OS == "linux" {
doTest(t, "unixpacket", "/tmp/gotest.net", "/tmp/gotest.net")
os.Remove("/tmp/gotest.net")
// Test abstract unix domain socket, a Linux-ism
doTest(t, "unix", "@gotest/net", "@gotest/net")
doTest(t, "unixpacket", "@gotest/net", "@gotest/net")
}
}
func runPacket(t *testing.T, network, addr string, listening chan<- string, done chan<- int) {
c, err := ListenPacket(network, addr)
if err != nil {
t.Fatalf("net.ListenPacket(%q, %q) = _, %v", network, addr, err)
}
listening <- c.LocalAddr().String()
c.SetReadTimeout(10e6) // 10ms
var buf [1000]byte
for {
n, addr, err := c.ReadFrom(buf[0:])
if e, ok := err.(Error); ok && e.Timeout() {
if done <- 1 {
break
}
continue
}
if err != nil {
break
}
if _, err = c.WriteTo(buf[0:n], addr); err != nil {
t.Fatalf("WriteTo %v: %v", addr, err)
}
}
c.Close()
done <- 1
}
func doTestPacket(t *testing.T, network, listenaddr, dialaddr string, isEmpty bool) {
t.Logf("TestPacket %s %s %s\n", network, listenaddr, dialaddr)
listening := make(chan string)
done := make(chan int)
if network == "udp" {
listenaddr += ":0" // any available port
}
go runPacket(t, network, listenaddr, listening, done)
addr := <-listening // wait for server to start
if network == "udp" {
dialaddr += addr[strings.LastIndex(addr, ":"):]
}
connect(t, network, dialaddr, isEmpty)
<-done // tell server to stop
<-done // wait for stop
}
func TestUDPServer(t *testing.T) {
if !*testUDP {
return
}
for _, isEmpty := range []bool{false, true} {
doTestPacket(t, "udp", "0.0.0.0", "127.0.0.1", isEmpty)
doTestPacket(t, "udp", "", "127.0.0.1", isEmpty)
if kernelSupportsIPv6() {
doTestPacket(t, "udp", "[::]", "[::ffff:127.0.0.1]", isEmpty)
doTestPacket(t, "udp", "[::]", "127.0.0.1", isEmpty)
doTestPacket(t, "udp", "0.0.0.0", "[::ffff:127.0.0.1]", isEmpty)
}
}
}
func TestUnixDatagramServer(t *testing.T) {
// "unix" sockets are not supported on windows.
if runtime.GOOS == "windows" {
return
}
for _, isEmpty := range []bool{false} {
os.Remove("/tmp/gotest1.net")
os.Remove("/tmp/gotest1.net.local")
doTestPacket(t, "unixgram", "/tmp/gotest1.net", "/tmp/gotest1.net", isEmpty)
os.Remove("/tmp/gotest1.net")
os.Remove("/tmp/gotest1.net.local")
if syscall.OS == "linux" {
// Test abstract unix domain socket, a Linux-ism
doTestPacket(t, "unixgram", "@gotest1/net", "@gotest1/net", isEmpty)
}
}
}
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