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-rw-r--r--src/net/conf_test.go393
1 files changed, 393 insertions, 0 deletions
diff --git a/src/net/conf_test.go b/src/net/conf_test.go
new file mode 100644
index 0000000..3736709
--- /dev/null
+++ b/src/net/conf_test.go
@@ -0,0 +1,393 @@
+// 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) {
+ tests := []struct {
+ name string
+ c *conf
+ nss *nssConf
+ resolver *Resolver
+ resolv *dnsConfig
+ hostTests []nssHostTest
+ }{
+ {
+ name: "force",
+ c: &conf{
+ forceCgoLookupHost: 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", hostLookupFilesDNS},
+ },
+ },
+ {
+ name: "ubuntu_trusty_avahi",
+ c: &conf{},
+ 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{},
+ 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{
+ hasMDNSAllow: true,
+ },
+ 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},
+ {"", "myhostname", hostLookupFilesDNS}, // Issue 13623
+ },
+ },
+ {
+ name: "ubuntu14.04.02",
+ c: &conf{},
+ 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}},
+ },
+ // Android should always use cgo.
+ {
+ name: "android",
+ c: &conf{
+ goos: "android",
+ },
+ resolv: defaultResolvConf,
+ nss: nssStr(t, ""),
+ hostTests: []nssHostTest{
+ {"x.com", "myhostname", hostLookupCgo},
+ },
+ },
+ // Issue 24393: make sure "Resolver.PreferGo = true" acts like netgo.
+ {
+ name: "resolver-prefergo",
+ resolver: &Resolver{PreferGo: true},
+ c: &conf{
+ goos: "darwin",
+ forceCgoLookupHost: true, // always true for darwin
+ netCgo: true,
+ },
+ resolv: defaultResolvConf,
+ nss: nssStr(t, ""),
+ hostTests: []nssHostTest{
+ {"localhost", "myhostname", hostLookupFilesDNS},
+ },
+ },
+ }
+
+ 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 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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