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Name	Size	Permission
http	[ DIR ]	drwxr-xr-x
internal	[ DIR ]	drwxr-xr-x
mail	[ DIR ]	drwxr-xr-x
netip	[ DIR ]	drwxr-xr-x
rpc	[ DIR ]	drwxr-xr-x
smtp	[ DIR ]	drwxr-xr-x
testdata	[ DIR ]	drwxr-xr-x
textproto	[ DIR ]	drwxr-xr-x
url	[ DIR ]	drwxr-xr-x
addrselect.go	9.69 KB	-rw-r--r--
addrselect_test.go	8.5 KB	-rw-r--r--
cgo_aix.go	582 B	-rw-r--r--
cgo_android.go	272 B	-rw-r--r--
cgo_bsd.go	343 B	-rw-r--r--
cgo_darwin.go	298 B	-rw-r--r--
cgo_linux.go	642 B	-rw-r--r--
cgo_netbsd.go	276 B	-rw-r--r--
cgo_openbsd.go	276 B	-rw-r--r--
cgo_resnew.go	580 B	-rw-r--r--
cgo_resold.go	579 B	-rw-r--r--
cgo_socknew.go	753 B	-rw-r--r--
cgo_sockold.go	842 B	-rw-r--r--
cgo_solaris.go	343 B	-rw-r--r--
cgo_stub.go	1.33 KB	-rw-r--r--
cgo_unix.go	11.42 KB	-rw-r--r--
cgo_unix_cgo.go	2.24 KB	-rw-r--r--
cgo_unix_cgo_res.go	892 B	-rw-r--r--
cgo_unix_cgo_resn.go	979 B	-rw-r--r--
cgo_unix_syscall.go	3 KB	-rw-r--r--
cgo_unix_test.go	1.44 KB	-rw-r--r--
conf.go	15.48 KB	-rw-r--r--
conf_test.go	12.29 KB	-rw-r--r--
conn_test.go	1.82 KB	-rw-r--r--
dial.go	26.85 KB	-rw-r--r--
dial_test.go	30.28 KB	-rw-r--r--
dial_unix_test.go	2.77 KB	-rw-r--r--
dnsclient.go	5.67 KB	-rw-r--r--
dnsclient_test.go	1.51 KB	-rw-r--r--
dnsclient_unix.go	24.66 KB	-rw-r--r--
dnsclient_unix_test.go	72.77 KB	-rw-r--r--
dnsconfig.go	2.19 KB	-rw-r--r--
dnsconfig_unix.go	4.12 KB	-rw-r--r--
dnsconfig_unix_test.go	7.07 KB	-rw-r--r--
dnsconfig_windows.go	1.61 KB	-rw-r--r--
dnsname_test.go	1.96 KB	-rw-r--r--
error_plan9.go	224 B	-rw-r--r--
error_plan9_test.go	437 B	-rw-r--r--
error_posix.go	543 B	-rw-r--r--
error_posix_test.go	981 B	-rw-r--r--
error_test.go	20.32 KB	-rw-r--r--
error_unix.go	382 B	-rw-r--r--
error_unix_test.go	723 B	-rw-r--r--
error_windows.go	355 B	-rw-r--r--
error_windows_test.go	757 B	-rw-r--r--
example_test.go	8.45 KB	-rw-r--r--
external_test.go	4.05 KB	-rw-r--r--
fd_fake.go	3.79 KB	-rw-r--r--
fd_js.go	627 B	-rw-r--r--
fd_plan9.go	3.56 KB	-rw-r--r--
fd_posix.go	4.29 KB	-rw-r--r--
fd_unix.go	5.43 KB	-rw-r--r--
fd_wasip1.go	496 B	-rw-r--r--
fd_windows.go	6.21 KB	-rw-r--r--
file.go	1.69 KB	-rw-r--r--
file_plan9.go	2.77 KB	-rw-r--r--
file_stub.go	481 B	-rw-r--r--
file_test.go	6.43 KB	-rw-r--r--
file_unix.go	2.55 KB	-rw-r--r--
file_unix_test.go	2.07 KB	-rw-r--r--
file_wasip1.go	2.2 KB	-rw-r--r--
file_wasip1_test.go	3.76 KB	-rw-r--r--
file_windows.go	521 B	-rw-r--r--
hook.go	934 B	-rw-r--r--
hook_plan9.go	211 B	-rw-r--r--
hook_unix.go	658 B	-rw-r--r--
hook_windows.go	720 B	-rw-r--r--
hosts.go	3.48 KB	-rw-r--r--
hosts_test.go	5.6 KB	-rw-r--r--
interface.go	7.57 KB	-rw-r--r--
interface_aix.go	4.46 KB	-rw-r--r--
interface_bsd.go	2.82 KB	-rw-r--r--
interface_bsd_test.go	1.44 KB	-rw-r--r--
interface_bsdvar.go	718 B	-rw-r--r--
interface_darwin.go	1.29 KB	-rw-r--r--
interface_freebsd.go	1.29 KB	-rw-r--r--
interface_linux.go	6.96 KB	-rw-r--r--
interface_linux_test.go	3.65 KB	-rw-r--r--
interface_plan9.go	4.74 KB	-rw-r--r--
interface_solaris.go	2.13 KB	-rw-r--r--
interface_stub.go	814 B	-rw-r--r--
interface_test.go	9.76 KB	-rw-r--r--
interface_unix_test.go	4.85 KB	-rw-r--r--
interface_windows.go	5.49 KB	-rw-r--r--
ip.go	13.97 KB	-rw-r--r--
ip_test.go	25.69 KB	-rw-r--r--
iprawsock.go	7.11 KB	-rw-r--r--
iprawsock_plan9.go	874 B	-rw-r--r--
iprawsock_posix.go	3.89 KB	-rw-r--r--
iprawsock_test.go	5.98 KB	-rw-r--r--
ipsock.go	9.43 KB	-rw-r--r--
ipsock_plan9.go	7.48 KB	-rw-r--r--
ipsock_plan9_test.go	645 B	-rw-r--r--
ipsock_posix.go	8.62 KB	-rw-r--r--
ipsock_test.go	6.81 KB	-rw-r--r--
listen_test.go	20.5 KB	-rw-r--r--
lookup.go	28.6 KB	-rw-r--r--
lookup_plan9.go	9.89 KB	-rw-r--r--
lookup_test.go	41.45 KB	-rw-r--r--
lookup_unix.go	3.35 KB	-rw-r--r--
lookup_windows.go	14.19 KB	-rw-r--r--
lookup_windows_test.go	8.7 KB	-rw-r--r--
mac.go	1.88 KB	-rw-r--r--
mac_test.go	3.26 KB	-rw-r--r--
main_cloexec_test.go	693 B	-rw-r--r--
main_conf_test.go	2.45 KB	-rw-r--r--
main_plan9_test.go	392 B	-rw-r--r--
main_posix_test.go	1.37 KB	-rw-r--r--
main_test.go	7.53 KB	-rw-r--r--
main_unix_test.go	1.19 KB	-rw-r--r--
main_wasm_test.go	284 B	-rw-r--r--
main_windows_test.go	1 KB	-rw-r--r--
mockserver_test.go	13.28 KB	-rw-r--r--
mptcpsock_linux.go	3.96 KB	-rw-r--r--
mptcpsock_linux_test.go	4.06 KB	-rw-r--r--
mptcpsock_stub.go	542 B	-rw-r--r--
net.go	27.12 KB	-rw-r--r--
net_fake.go	26.45 KB	-rw-r--r--
net_fake_test.go	2.79 KB	-rw-r--r--
net_test.go	13.3 KB	-rw-r--r--
net_windows_test.go	16.28 KB	-rw-r--r--
netcgo_off.go	222 B	-rw-r--r--
netcgo_on.go	220 B	-rw-r--r--
netgo_netcgo.go	453 B	-rw-r--r--
netgo_off.go	220 B	-rw-r--r--
netgo_on.go	218 B	-rw-r--r--
nss.go	5.48 KB	-rw-r--r--
nss_test.go	3.4 KB	-rw-r--r--
packetconn_test.go	3.02 KB	-rw-r--r--
parse.go	5.66 KB	-rw-r--r--
parse_test.go	1.65 KB	-rw-r--r--
pipe.go	5.43 KB	-rw-r--r--
pipe_test.go	1.2 KB	-rw-r--r--
platform_test.go	4.33 KB	-rw-r--r--
port.go	1.46 KB	-rw-r--r--
port_test.go	1.34 KB	-rw-r--r--
port_unix.go	1.24 KB	-rw-r--r--
protoconn_test.go	7.44 KB	-rw-r--r--
rawconn.go	2.7 KB	-rw-r--r--
rawconn_stub_test.go	631 B	-rw-r--r--
rawconn_test.go	4.33 KB	-rw-r--r--
rawconn_unix_test.go	2.96 KB	-rw-r--r--
rawconn_windows_test.go	3.12 KB	-rw-r--r--
resolverdialfunc_test.go	8.25 KB	-rw-r--r--
rlimit_js.go	346 B	-rw-r--r--
rlimit_unix.go	1.1 KB	-rw-r--r--
sendfile_linux.go	1.15 KB	-rw-r--r--
sendfile_stub.go	403 B	-rw-r--r--
sendfile_test.go	12.06 KB	-rw-r--r--
sendfile_unix_alt.go	2.27 KB	-rw-r--r--
sendfile_windows.go	1.05 KB	-rw-r--r--
server_test.go	11.67 KB	-rw-r--r--
sock_bsd.go	918 B	-rw-r--r--
sock_cloexec.go	730 B	-rw-r--r--
sock_cloexec_solaris.go	1.43 KB	-rw-r--r--
sock_linux.go	993 B	-rw-r--r--
sock_linux_test.go	575 B	-rw-r--r--
sock_plan9.go	262 B	-rw-r--r--
sock_posix.go	6.29 KB	-rw-r--r--
sock_stub.go	390 B	-rw-r--r--
sock_windows.go	802 B	-rw-r--r--
sockaddr_posix.go	1.45 KB	-rw-r--r--
sockopt_aix.go	1.43 KB	-rw-r--r--
sockopt_bsd.go	2.21 KB	-rw-r--r--
sockopt_fake.go	955 B	-rw-r--r--
sockopt_linux.go	1.25 KB	-rw-r--r--
sockopt_plan9.go	406 B	-rw-r--r--
sockopt_posix.go	2.13 KB	-rw-r--r--
sockopt_solaris.go	1.25 KB	-rw-r--r--
sockopt_windows.go	1.51 KB	-rw-r--r--
sockoptip_bsdvar.go	867 B	-rw-r--r--
sockoptip_linux.go	735 B	-rw-r--r--
sockoptip_posix.go	1.38 KB	-rw-r--r--
sockoptip_stub.go	769 B	-rw-r--r--
sockoptip_windows.go	786 B	-rw-r--r--
splice_linux.go	1.71 KB	-rw-r--r--
splice_linux_test.go	14.49 KB	-rw-r--r--
splice_stub.go	376 B	-rw-r--r--
sys_cloexec.go	962 B	-rw-r--r--
tcpconn_keepalive_conf_darwin_...	430 B	-rw-r--r--
tcpconn_keepalive_conf_posix_t...	1.55 KB	-rw-r--r--
tcpconn_keepalive_conf_solaris...	1.77 KB	-rw-r--r--
tcpconn_keepalive_conf_unix_te...	490 B	-rw-r--r--
tcpconn_keepalive_conf_windows...	987 B	-rw-r--r--
tcpconn_keepalive_illumos_test...	3.98 KB	-rw-r--r--
tcpconn_keepalive_posix_test.g...	2.52 KB	-rw-r--r--
tcpconn_keepalive_solaris_test...	5.67 KB	-rw-r--r--
tcpconn_keepalive_test.go	4.15 KB	-rw-r--r--
tcpsock.go	13.67 KB	-rw-r--r--
tcpsock_plan9.go	2.3 KB	-rw-r--r--
tcpsock_posix.go	6.27 KB	-rw-r--r--
tcpsock_solaris.go	1.32 KB	-rw-r--r--
tcpsock_test.go	17.68 KB	-rw-r--r--
tcpsock_unix.go	1.05 KB	-rw-r--r--
tcpsock_unix_test.go	2.34 KB	-rw-r--r--
tcpsock_windows.go	1.31 KB	-rw-r--r--
tcpsockopt_darwin.go	1.4 KB	-rw-r--r--
tcpsockopt_openbsd.go	759 B	-rw-r--r--
tcpsockopt_plan9.go	762 B	-rw-r--r--
tcpsockopt_posix.go	442 B	-rw-r--r--
tcpsockopt_solaris.go	3.35 KB	-rw-r--r--
tcpsockopt_stub.go	570 B	-rw-r--r--
tcpsockopt_unix.go	1.32 KB	-rw-r--r--
tcpsockopt_windows.go	3.76 KB	-rw-r--r--
timeout_test.go	30.01 KB	-rw-r--r--
udpsock.go	11.83 KB	-rw-r--r--
udpsock_plan9.go	4.64 KB	-rw-r--r--
udpsock_plan9_test.go	1.31 KB	-rw-r--r--
udpsock_posix.go	7.53 KB	-rw-r--r--
udpsock_test.go	17.24 KB	-rw-r--r--
unixsock.go	10.12 KB	-rw-r--r--
unixsock_linux_test.go	2.29 KB	-rw-r--r--
unixsock_plan9.go	1.24 KB	-rw-r--r--
unixsock_posix.go	6.64 KB	-rw-r--r--
unixsock_readmsg_cloexec.go	654 B	-rw-r--r--
unixsock_readmsg_cmsg_cloexec....	332 B	-rw-r--r--
unixsock_readmsg_other.go	275 B	-rw-r--r--
unixsock_readmsg_test.go	2.51 KB	-rw-r--r--
unixsock_test.go	10.64 KB	-rw-r--r--
unixsock_windows_test.go	1.83 KB	-rw-r--r--
write_unix_test.go	1.61 KB	-rw-r--r--
writev_test.go	5.03 KB	-rw-r--r--
writev_unix.go	666 B	-rw-r--r--

Code Editor : 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", hostLookupFilesDNS},
			},
		},
		{
			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", hostLookupDNSFiles},
			},
		},
		{
			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()
}

${this.title}

Code Editor : conf_test.go