Preview: conf_test.go
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/proc/thread-self/root/opt/golang/1.22.0/src/net/conf_test.go
// 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.
//go:build unix
package net
import (
"io/fs"
"os"
"testing"
"time"
)
type nssHostTest struct {
host string
localhost string
want hostLookupOrder
}
func nssStr(t *testing.T, s string) *nssConf {
f, err := os.CreateTemp(t.TempDir(), "nss")
if err != nil {
t.Fatal(err)
}
if _, err := f.WriteString(s); err != nil {
t.Fatal(err)
}
if err := f.Close(); err != nil {
t.Fatal(err)
}
return parseNSSConfFile(f.Name())
}
// represents a dnsConfig returned by parsing a nonexistent resolv.conf
var defaultResolvConf = &dnsConfig{
servers: defaultNS,
ndots: 1,
timeout: 5,
attempts: 2,
err: fs.ErrNotExist,
}
func TestConfHostLookupOrder(t *testing.T) {
// These tests are written for a system with cgo available,
// without using the netgo tag.
if netGoBuildTag {
t.Skip("skipping test because net package built with netgo tag")
}
if !cgoAvailable {
t.Skip("skipping test because cgo resolver not available")
}
tests := []struct {
name string
c *conf
nss *nssConf
resolver *Resolver
resolv *dnsConfig
hostTests []nssHostTest
}{
{
name: "force",
c: &conf{
preferCgo: true,
netCgo: true,
},
resolv: defaultResolvConf,
nss: nssStr(t, "foo: bar"),
hostTests: []nssHostTest{
{"foo.local", "myhostname", hostLookupCgo},
{"google.com", "myhostname", hostLookupCgo},
},
},
{
name: "netgo_dns_before_files",
c: &conf{
netGo: true,
},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns files"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNSFiles},
},
},
{
name: "netgo_fallback_on_cgo",
c: &conf{
netGo: true,
},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns files something_custom"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNSFiles},
},
},
{
name: "ubuntu_trusty_avahi",
c: &conf{
mdnsTest: mdnsAssumeDoesNotExist,
},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4"),
hostTests: []nssHostTest{
{"foo.local", "myhostname", hostLookupCgo},
{"foo.local.", "myhostname", hostLookupCgo},
{"foo.LOCAL", "myhostname", hostLookupCgo},
{"foo.LOCAL.", "myhostname", hostLookupCgo},
{"google.com", "myhostname", hostLookupFilesDNS},
},
},
{
name: "freebsdlinux_no_resolv_conf",
c: &conf{
goos: "freebsd",
},
resolv: defaultResolvConf,
nss: nssStr(t, "foo: bar"),
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}},
},
// On OpenBSD, no resolv.conf means no DNS.
{
name: "openbsd_no_resolv_conf",
c: &conf{
goos: "openbsd",
},
resolv: defaultResolvConf,
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFiles}},
},
{
name: "solaris_no_nsswitch",
c: &conf{
goos: "solaris",
},
resolv: defaultResolvConf,
nss: &nssConf{err: fs.ErrNotExist},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}},
},
{
name: "openbsd_lookup_bind_file",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: []string{"bind", "file"}},
hostTests: []nssHostTest{
{"google.com", "myhostname", hostLookupDNSFiles},
{"foo.local", "myhostname", hostLookupDNSFiles},
},
},
{
name: "openbsd_lookup_file_bind",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: []string{"file", "bind"}},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}},
},
{
name: "openbsd_lookup_bind",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: []string{"bind"}},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupDNS}},
},
{
name: "openbsd_lookup_file",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: []string{"file"}},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFiles}},
},
{
name: "openbsd_lookup_yp",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: []string{"file", "bind", "yp"}},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}},
},
{
name: "openbsd_lookup_two",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: []string{"file", "foo"}},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}},
},
{
name: "openbsd_lookup_empty",
c: &conf{
goos: "openbsd",
},
resolv: &dnsConfig{lookup: nil},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupDNSFiles}},
},
{
name: "linux_no_nsswitch.conf",
c: &conf{
goos: "linux",
},
resolv: defaultResolvConf,
nss: &nssConf{err: fs.ErrNotExist},
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}},
},
{
name: "linux_empty_nsswitch.conf",
c: &conf{
goos: "linux",
},
resolv: defaultResolvConf,
nss: nssStr(t, ""),
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}},
},
{
name: "files_mdns_dns",
c: &conf{
mdnsTest: mdnsAssumeDoesNotExist,
},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: files mdns dns"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupFilesDNS},
{"x.local", "myhostname", hostLookupCgo},
},
},
{
name: "dns_special_hostnames",
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNS},
{"x\\.com", "myhostname", hostLookupCgo}, // punt on weird glibc escape
{"foo.com%en0", "myhostname", hostLookupCgo}, // and IPv6 zones
},
},
{
name: "mdns_allow",
c: &conf{
mdnsTest: mdnsAssumeExists,
},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: files mdns dns"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupCgo},
{"x.local", "myhostname", hostLookupCgo},
},
},
{
name: "files_dns",
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: files dns"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupFilesDNS},
{"x", "myhostname", hostLookupFilesDNS},
{"x.local", "myhostname", hostLookupCgo},
},
},
{
name: "dns_files",
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns files"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNSFiles},
{"x", "myhostname", hostLookupDNSFiles},
{"x.local", "myhostname", hostLookupCgo},
},
},
{
name: "something_custom",
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns files something_custom"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupCgo},
},
},
{
name: "myhostname",
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: files dns myhostname"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupFilesDNS},
{"myhostname", "myhostname", hostLookupCgo},
{"myHostname", "myhostname", hostLookupCgo},
{"myhostname.dot", "myhostname.dot", hostLookupCgo},
{"myHostname.dot", "myhostname.dot", hostLookupCgo},
{"_gateway", "myhostname", hostLookupCgo},
{"_Gateway", "myhostname", hostLookupCgo},
{"_outbound", "myhostname", hostLookupCgo},
{"_Outbound", "myhostname", hostLookupCgo},
{"localhost", "myhostname", hostLookupCgo},
{"Localhost", "myhostname", hostLookupCgo},
{"anything.localhost", "myhostname", hostLookupCgo},
{"Anything.localhost", "myhostname", hostLookupCgo},
{"localhost.localdomain", "myhostname", hostLookupCgo},
{"Localhost.Localdomain", "myhostname", hostLookupCgo},
{"anything.localhost.localdomain", "myhostname", hostLookupCgo},
{"Anything.Localhost.Localdomain", "myhostname", hostLookupCgo},
{"somehostname", "myhostname", hostLookupFilesDNS},
},
},
{
name: "ubuntu14.04.02",
c: &conf{
mdnsTest: mdnsAssumeDoesNotExist,
},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: files myhostname mdns4_minimal [NOTFOUND=return] dns mdns4"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupFilesDNS},
{"somehostname", "myhostname", hostLookupFilesDNS},
{"myhostname", "myhostname", hostLookupCgo},
},
},
// Debian Squeeze is just "dns,files", but lists all
// the default criteria for dns, but then has a
// non-standard but redundant notfound=return for the
// files.
{
name: "debian_squeeze",
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns [success=return notfound=continue unavail=continue tryagain=continue] files [notfound=return]"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNSFiles},
{"somehostname", "myhostname", hostLookupDNSFiles},
},
},
{
name: "resolv.conf-unknown",
c: &conf{},
resolv: &dnsConfig{servers: defaultNS, ndots: 1, timeout: 5, attempts: 2, unknownOpt: true},
nss: nssStr(t, "foo: bar"),
hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}},
},
// Issue 24393: make sure "Resolver.PreferGo = true" acts like netgo.
{
name: "resolver-prefergo",
resolver: &Resolver{PreferGo: true},
c: &conf{
preferCgo: true,
netCgo: true,
},
resolv: defaultResolvConf,
nss: nssStr(t, ""),
hostTests: []nssHostTest{
{"localhost", "myhostname", hostLookupFilesDNS},
},
},
{
name: "unknown-source",
resolver: &Resolver{PreferGo: true},
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: resolve files"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNSFiles},
},
},
{
name: "dns-among-unknown-sources",
resolver: &Resolver{PreferGo: true},
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: mymachines files dns"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupFilesDNS},
},
},
{
name: "dns-among-unknown-sources-2",
resolver: &Resolver{PreferGo: true},
c: &conf{},
resolv: defaultResolvConf,
nss: nssStr(t, "hosts: dns mymachines files"),
hostTests: []nssHostTest{
{"x.com", "myhostname", hostLookupDNSFiles},
},
},
}
origGetHostname := getHostname
defer func() { getHostname = origGetHostname }()
defer setSystemNSS(getSystemNSS(), 0)
conf, err := newResolvConfTest()
if err != nil {
t.Fatal(err)
}
defer conf.teardown()
for _, tt := range tests {
if !conf.forceUpdateConf(tt.resolv, time.Now().Add(time.Hour)) {
t.Errorf("%s: failed to change resolv config", tt.name)
}
for _, ht := range tt.hostTests {
getHostname = func() (string, error) { return ht.localhost, nil }
setSystemNSS(tt.nss, time.Hour)
gotOrder, _ := tt.c.hostLookupOrder(tt.resolver, ht.host)
if gotOrder != ht.want {
t.Errorf("%s: hostLookupOrder(%q) = %v; want %v", tt.name, ht.host, gotOrder, ht.want)
}
}
}
}
func TestAddrLookupOrder(t *testing.T) {
// This test is written for a system with cgo available,
// without using the netgo tag.
if netGoBuildTag {
t.Skip("skipping test because net package built with netgo tag")
}
if !cgoAvailable {
t.Skip("skipping test because cgo resolver not available")
}
defer setSystemNSS(getSystemNSS(), 0)
c, err := newResolvConfTest()
if err != nil {
t.Fatal(err)
}
defer c.teardown()
if !c.forceUpdateConf(defaultResolvConf, time.Now().Add(time.Hour)) {
t.Fatal("failed to change resolv config")
}
setSystemNSS(nssStr(t, "hosts: files myhostname dns"), time.Hour)
cnf := &conf{}
order, _ := cnf.addrLookupOrder(nil, "192.0.2.1")
if order != hostLookupCgo {
t.Errorf("addrLookupOrder returned: %v, want cgo", order)
}
setSystemNSS(nssStr(t, "hosts: files mdns4 dns"), time.Hour)
order, _ = cnf.addrLookupOrder(nil, "192.0.2.1")
if order != hostLookupCgo {
t.Errorf("addrLookupOrder returned: %v, want cgo", order)
}
}
func setSystemNSS(nss *nssConf, addDur time.Duration) {
nssConfig.mu.Lock()
nssConfig.nssConf = nss
nssConfig.mu.Unlock()
nssConfig.acquireSema()
nssConfig.lastChecked = time.Now().Add(addDur)
nssConfig.releaseSema()
}
func TestSystemConf(t *testing.T) {
systemConf()
}
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