| // 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. |
| |
| // +build darwin dragonfly freebsd linux netbsd openbsd solaris |
| |
| package net |
| |
| import ( |
| "os" |
| "strings" |
| "testing" |
| ) |
| |
| type nssHostTest struct { |
| host string |
| localhost string |
| want hostLookupOrder |
| } |
| |
| func nssStr(s string) *nssConf { return parseNSSConf(strings.NewReader(s)) } |
| |
| // represents a dnsConfig returned by parsing a nonexistent resolv.conf |
| var defaultResolvConf = &dnsConfig{ |
| servers: defaultNS, |
| ndots: 1, |
| timeout: 5, |
| attempts: 2, |
| err: os.ErrNotExist, |
| } |
| |
| func TestConfHostLookupOrder(t *testing.T) { |
| tests := []struct { |
| name string |
| c *conf |
| resolver *Resolver |
| hostTests []nssHostTest |
| }{ |
| { |
| name: "force", |
| c: &conf{ |
| forceCgoLookupHost: true, |
| nss: nssStr("foo: bar"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"foo.local", "myhostname", hostLookupCgo}, |
| {"google.com", "myhostname", hostLookupCgo}, |
| }, |
| }, |
| { |
| name: "netgo_dns_before_files", |
| c: &conf{ |
| netGo: true, |
| nss: nssStr("hosts: dns files"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupDNSFiles}, |
| }, |
| }, |
| { |
| name: "netgo_fallback_on_cgo", |
| c: &conf{ |
| netGo: true, |
| nss: nssStr("hosts: dns files something_custom"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupFilesDNS}, |
| }, |
| }, |
| { |
| name: "ubuntu_trusty_avahi", |
| c: &conf{ |
| nss: nssStr("hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4"), |
| resolv: defaultResolvConf, |
| }, |
| 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", |
| nss: nssStr("foo: bar"), |
| resolv: defaultResolvConf, |
| }, |
| 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", |
| nss: &nssConf{err: os.ErrNotExist}, |
| resolv: defaultResolvConf, |
| }, |
| 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}}, |
| }, |
| // glibc lacking an nsswitch.conf, per |
| // https://www.gnu.org/software/libc/manual/html_node/Notes-on-NSS-Configuration-File.html |
| { |
| name: "linux_no_nsswitch.conf", |
| c: &conf{ |
| goos: "linux", |
| nss: &nssConf{err: os.ErrNotExist}, |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupDNSFiles}}, |
| }, |
| { |
| name: "files_mdns_dns", |
| c: &conf{ |
| nss: nssStr("hosts: files mdns dns"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupFilesDNS}, |
| {"x.local", "myhostname", hostLookupCgo}, |
| }, |
| }, |
| { |
| name: "dns_special_hostnames", |
| c: &conf{ |
| nss: nssStr("hosts: dns"), |
| resolv: defaultResolvConf, |
| }, |
| 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{ |
| nss: nssStr("hosts: files mdns dns"), |
| resolv: defaultResolvConf, |
| hasMDNSAllow: true, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupCgo}, |
| {"x.local", "myhostname", hostLookupCgo}, |
| }, |
| }, |
| { |
| name: "files_dns", |
| c: &conf{ |
| nss: nssStr("hosts: files dns"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupFilesDNS}, |
| {"x", "myhostname", hostLookupFilesDNS}, |
| {"x.local", "myhostname", hostLookupCgo}, |
| }, |
| }, |
| { |
| name: "dns_files", |
| c: &conf{ |
| nss: nssStr("hosts: dns files"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupDNSFiles}, |
| {"x", "myhostname", hostLookupDNSFiles}, |
| {"x.local", "myhostname", hostLookupCgo}, |
| }, |
| }, |
| { |
| name: "something_custom", |
| c: &conf{ |
| nss: nssStr("hosts: dns files something_custom"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupCgo}, |
| }, |
| }, |
| { |
| name: "myhostname", |
| c: &conf{ |
| nss: nssStr("hosts: files dns myhostname"), |
| resolv: defaultResolvConf, |
| }, |
| 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}, |
| {"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{ |
| nss: nssStr("hosts: files myhostname mdns4_minimal [NOTFOUND=return] dns mdns4"), |
| resolv: defaultResolvConf, |
| }, |
| 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{ |
| nss: nssStr("hosts: dns [success=return notfound=continue unavail=continue tryagain=continue] files [notfound=return]"), |
| resolv: defaultResolvConf, |
| }, |
| hostTests: []nssHostTest{ |
| {"x.com", "myhostname", hostLookupDNSFiles}, |
| {"somehostname", "myhostname", hostLookupDNSFiles}, |
| }, |
| }, |
| { |
| name: "resolv.conf-unknown", |
| c: &conf{ |
| nss: nssStr("foo: bar"), |
| resolv: &dnsConfig{servers: defaultNS, ndots: 1, timeout: 5, attempts: 2, unknownOpt: true}, |
| }, |
| hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}}, |
| }, |
| // Android should always use cgo. |
| { |
| name: "android", |
| c: &conf{ |
| goos: "android", |
| nss: nssStr(""), |
| resolv: defaultResolvConf, |
| }, |
| 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 |
| resolv: defaultResolvConf, |
| nss: nssStr(""), |
| netCgo: true, |
| }, |
| hostTests: []nssHostTest{ |
| {"localhost", "myhostname", hostLookupFilesDNS}, |
| }, |
| }, |
| } |
| |
| origGetHostname := getHostname |
| defer func() { getHostname = origGetHostname }() |
| |
| for _, tt := range tests { |
| for _, ht := range tt.hostTests { |
| getHostname = func() (string, error) { return ht.localhost, nil } |
| |
| 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 TestSystemConf(t *testing.T) { |
| systemConf() |
| } |
