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// Copyright 2015 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"
"os"
"os/exec"
"runtime"
"strconv"
"strings"
"testing"
)
var unixEnabledOnAIX bool
func init() {
if runtime.GOOS == "aix" {
// Unix network isn't properly working on AIX 7.2 with
// Technical Level < 2.
// The information is retrieved only once in this init()
// instead of everytime testableNetwork is called.
out, _ := exec.Command("oslevel", "-s").Output()
if len(out) >= len("7200-XX-ZZ-YYMM") { // AIX 7.2, Tech Level XX, Service Pack ZZ, date YYMM
aixVer := string(out[:4])
tl, _ := strconv.Atoi(string(out[5:7]))
unixEnabledOnAIX = aixVer > "7200" || (aixVer == "7200" && tl >= 2)
}
}
}
// testableNetwork reports whether network is testable on the current
// platform configuration.
func testableNetwork(network string) bool {
net, _, _ := strings.Cut(network, ":")
switch net {
case "ip+nopriv":
case "ip", "ip4", "ip6":
switch runtime.GOOS {
case "plan9":
return false
default:
if os.Getuid() != 0 {
return false
}
}
case "unix", "unixgram":
switch runtime.GOOS {
case "android", "plan9", "windows":
return false
case "aix":
return unixEnabledOnAIX
}
// iOS does not support unix, unixgram.
if iOS() {
return false
}
case "unixpacket":
switch runtime.GOOS {
case "aix", "android", "darwin", "ios", "plan9", "windows":
return false
case "netbsd":
// It passes on amd64 at least. 386 fails (Issue 22927). arm is unknown.
if runtime.GOARCH == "386" {
return false
}
}
}
switch net {
case "tcp4", "udp4", "ip4":
if !supportsIPv4() {
return false
}
case "tcp6", "udp6", "ip6":
if !supportsIPv6() {
return false
}
}
return true
}
func iOS() bool {
return runtime.GOOS == "ios"
}
// testableAddress reports whether address of network is testable on
// the current platform configuration.
func testableAddress(network, address string) bool {
switch net, _, _ := strings.Cut(network, ":"); net {
case "unix", "unixgram", "unixpacket":
// Abstract unix domain sockets, a Linux-ism.
if address[0] == '@' && runtime.GOOS != "linux" {
return false
}
}
return true
}
// testableListenArgs reports whether arguments are testable on the
// current platform configuration.
func testableListenArgs(network, address, client string) bool {
if !testableNetwork(network) || !testableAddress(network, address) {
return false
}
var err error
var addr Addr
switch net, _, _ := strings.Cut(network, ":"); net {
case "tcp", "tcp4", "tcp6":
addr, err = ResolveTCPAddr("tcp", address)
case "udp", "udp4", "udp6":
addr, err = ResolveUDPAddr("udp", address)
case "ip", "ip4", "ip6":
addr, err = ResolveIPAddr("ip", address)
default:
return true
}
if err != nil {
return false
}
var ip IP
var wildcard bool
switch addr := addr.(type) {
case *TCPAddr:
ip = addr.IP
wildcard = addr.isWildcard()
case *UDPAddr:
ip = addr.IP
wildcard = addr.isWildcard()
case *IPAddr:
ip = addr.IP
wildcard = addr.isWildcard()
}
// Test wildcard IP addresses.
if wildcard && !testenv.HasExternalNetwork() {
return false
}
// Test functionality of IPv4 communication using AF_INET and
// IPv6 communication using AF_INET6 sockets.
if !supportsIPv4() && ip.To4() != nil {
return false
}
if !supportsIPv6() && ip.To16() != nil && ip.To4() == nil {
return false
}
cip := ParseIP(client)
if cip != nil {
if !supportsIPv4() && cip.To4() != nil {
return false
}
if !supportsIPv6() && cip.To16() != nil && cip.To4() == nil {
return false
}
}
// Test functionality of IPv4 communication using AF_INET6
// sockets.
if !supportsIPv4map() && supportsIPv4() && (network == "tcp" || network == "udp" || network == "ip") && wildcard {
// At this point, we prefer IPv4 when ip is nil.
// See favoriteAddrFamily for further information.
if ip.To16() != nil && ip.To4() == nil && cip.To4() != nil { // a pair of IPv6 server and IPv4 client
return false
}
if (ip.To4() != nil || ip == nil) && cip.To16() != nil && cip.To4() == nil { // a pair of IPv4 server and IPv6 client
return false
}
}
return true
}
func condFatalf(t *testing.T, network string, format string, args ...any) {
t.Helper()
// A few APIs like File and Read/WriteMsg{UDP,IP} are not
// fully implemented yet on Plan 9 and Windows.
switch runtime.GOOS {
case "windows":
if network == "file+net" {
t.Logf(format, args...)
return
}
case "plan9":
t.Logf(format, args...)
return
}
t.Fatalf(format, args...)
}
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