1 // Copyright 2015 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 // +build darwin dragonfly freebsd linux netbsd openbsd solaris 6 7 package net 8 9 import ( 10 "os" 11 "strings" 12 "testing" 13 ) 14 15 type nssHostTest struct { 16 host string 17 localhost string 18 want hostLookupOrder 19 } 20 21 func nssStr(s string) *nssConf { return parseNSSConf(strings.NewReader(s)) } 22 23 // represents a dnsConfig returned by parsing a nonexistent resolv.conf 24 var defaultResolvConf = &dnsConfig{ 25 servers: defaultNS, 26 ndots: 1, 27 timeout: 5, 28 attempts: 2, 29 err: os.ErrNotExist, 30 } 31 32 func TestConfHostLookupOrder(t *testing.T) { 33 tests := []struct { 34 name string 35 c *conf 36 hostTests []nssHostTest 37 }{ 38 { 39 name: "force", 40 c: &conf{ 41 forceCgoLookupHost: true, 42 nss: nssStr("foo: bar"), 43 resolv: defaultResolvConf, 44 }, 45 hostTests: []nssHostTest{ 46 {"foo.local", "myhostname", hostLookupCgo}, 47 {"google.com", "myhostname", hostLookupCgo}, 48 }, 49 }, 50 { 51 name: "netgo_dns_before_files", 52 c: &conf{ 53 netGo: true, 54 nss: nssStr("hosts: dns files"), 55 resolv: defaultResolvConf, 56 }, 57 hostTests: []nssHostTest{ 58 {"x.com", "myhostname", hostLookupDNSFiles}, 59 }, 60 }, 61 { 62 name: "netgo_fallback_on_cgo", 63 c: &conf{ 64 netGo: true, 65 nss: nssStr("hosts: dns files something_custom"), 66 resolv: defaultResolvConf, 67 }, 68 hostTests: []nssHostTest{ 69 {"x.com", "myhostname", hostLookupFilesDNS}, 70 }, 71 }, 72 { 73 name: "ubuntu_trusty_avahi", 74 c: &conf{ 75 nss: nssStr("hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4"), 76 resolv: defaultResolvConf, 77 }, 78 hostTests: []nssHostTest{ 79 {"foo.local", "myhostname", hostLookupCgo}, 80 {"foo.local.", "myhostname", hostLookupCgo}, 81 {"foo.LOCAL", "myhostname", hostLookupCgo}, 82 {"foo.LOCAL.", "myhostname", hostLookupCgo}, 83 {"google.com", "myhostname", hostLookupFilesDNS}, 84 }, 85 }, 86 { 87 name: "freebsdlinux_no_resolv_conf", 88 c: &conf{ 89 goos: "freebsd", 90 nss: nssStr("foo: bar"), 91 resolv: defaultResolvConf, 92 }, 93 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}}, 94 }, 95 // On OpenBSD, no resolv.conf means no DNS. 96 { 97 name: "openbsd_no_resolv_conf", 98 c: &conf{ 99 goos: "openbsd", 100 resolv: defaultResolvConf, 101 }, 102 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFiles}}, 103 }, 104 { 105 name: "solaris_no_nsswitch", 106 c: &conf{ 107 goos: "solaris", 108 nss: &nssConf{err: os.ErrNotExist}, 109 resolv: defaultResolvConf, 110 }, 111 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}}, 112 }, 113 { 114 name: "openbsd_lookup_bind_file", 115 c: &conf{ 116 goos: "openbsd", 117 resolv: &dnsConfig{lookup: []string{"bind", "file"}}, 118 }, 119 hostTests: []nssHostTest{ 120 {"google.com", "myhostname", hostLookupDNSFiles}, 121 {"foo.local", "myhostname", hostLookupDNSFiles}, 122 }, 123 }, 124 { 125 name: "openbsd_lookup_file_bind", 126 c: &conf{ 127 goos: "openbsd", 128 resolv: &dnsConfig{lookup: []string{"file", "bind"}}, 129 }, 130 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFilesDNS}}, 131 }, 132 { 133 name: "openbsd_lookup_bind", 134 c: &conf{ 135 goos: "openbsd", 136 resolv: &dnsConfig{lookup: []string{"bind"}}, 137 }, 138 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupDNS}}, 139 }, 140 { 141 name: "openbsd_lookup_file", 142 c: &conf{ 143 goos: "openbsd", 144 resolv: &dnsConfig{lookup: []string{"file"}}, 145 }, 146 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupFiles}}, 147 }, 148 { 149 name: "openbsd_lookup_yp", 150 c: &conf{ 151 goos: "openbsd", 152 resolv: &dnsConfig{lookup: []string{"file", "bind", "yp"}}, 153 }, 154 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}}, 155 }, 156 { 157 name: "openbsd_lookup_two", 158 c: &conf{ 159 goos: "openbsd", 160 resolv: &dnsConfig{lookup: []string{"file", "foo"}}, 161 }, 162 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}}, 163 }, 164 { 165 name: "openbsd_lookup_empty", 166 c: &conf{ 167 goos: "openbsd", 168 resolv: &dnsConfig{lookup: nil}, 169 }, 170 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupDNSFiles}}, 171 }, 172 // glibc lacking an nsswitch.conf, per 173 // http://www.gnu.org/software/libc/manual/html_node/Notes-on-NSS-Configuration-File.html 174 { 175 name: "linux_no_nsswitch.conf", 176 c: &conf{ 177 goos: "linux", 178 nss: &nssConf{err: os.ErrNotExist}, 179 resolv: defaultResolvConf, 180 }, 181 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupDNSFiles}}, 182 }, 183 { 184 name: "files_mdns_dns", 185 c: &conf{ 186 nss: nssStr("hosts: files mdns dns"), 187 resolv: defaultResolvConf, 188 }, 189 hostTests: []nssHostTest{ 190 {"x.com", "myhostname", hostLookupFilesDNS}, 191 {"x.local", "myhostname", hostLookupCgo}, 192 }, 193 }, 194 { 195 name: "dns_special_hostnames", 196 c: &conf{ 197 nss: nssStr("hosts: dns"), 198 resolv: defaultResolvConf, 199 }, 200 hostTests: []nssHostTest{ 201 {"x.com", "myhostname", hostLookupDNS}, 202 {"x\\.com", "myhostname", hostLookupCgo}, // punt on weird glibc escape 203 {"foo.com%en0", "myhostname", hostLookupCgo}, // and IPv6 zones 204 }, 205 }, 206 { 207 name: "mdns_allow", 208 c: &conf{ 209 nss: nssStr("hosts: files mdns dns"), 210 resolv: defaultResolvConf, 211 hasMDNSAllow: true, 212 }, 213 hostTests: []nssHostTest{ 214 {"x.com", "myhostname", hostLookupCgo}, 215 {"x.local", "myhostname", hostLookupCgo}, 216 }, 217 }, 218 { 219 name: "files_dns", 220 c: &conf{ 221 nss: nssStr("hosts: files dns"), 222 resolv: defaultResolvConf, 223 }, 224 hostTests: []nssHostTest{ 225 {"x.com", "myhostname", hostLookupFilesDNS}, 226 {"x", "myhostname", hostLookupFilesDNS}, 227 {"x.local", "myhostname", hostLookupCgo}, 228 }, 229 }, 230 { 231 name: "dns_files", 232 c: &conf{ 233 nss: nssStr("hosts: dns files"), 234 resolv: defaultResolvConf, 235 }, 236 hostTests: []nssHostTest{ 237 {"x.com", "myhostname", hostLookupDNSFiles}, 238 {"x", "myhostname", hostLookupDNSFiles}, 239 {"x.local", "myhostname", hostLookupCgo}, 240 }, 241 }, 242 { 243 name: "something_custom", 244 c: &conf{ 245 nss: nssStr("hosts: dns files something_custom"), 246 resolv: defaultResolvConf, 247 }, 248 hostTests: []nssHostTest{ 249 {"x.com", "myhostname", hostLookupCgo}, 250 }, 251 }, 252 { 253 name: "myhostname", 254 c: &conf{ 255 nss: nssStr("hosts: files dns myhostname"), 256 resolv: defaultResolvConf, 257 }, 258 hostTests: []nssHostTest{ 259 {"x.com", "myhostname", hostLookupFilesDNS}, 260 {"myhostname", "myhostname", hostLookupCgo}, 261 {"myHostname", "myhostname", hostLookupCgo}, 262 {"myhostname.dot", "myhostname.dot", hostLookupCgo}, 263 {"myHostname.dot", "myhostname.dot", hostLookupCgo}, 264 {"gateway", "myhostname", hostLookupCgo}, 265 {"Gateway", "myhostname", hostLookupCgo}, 266 {"localhost", "myhostname", hostLookupCgo}, 267 {"Localhost", "myhostname", hostLookupCgo}, 268 {"anything.localhost", "myhostname", hostLookupCgo}, 269 {"Anything.localhost", "myhostname", hostLookupCgo}, 270 {"localhost.localdomain", "myhostname", hostLookupCgo}, 271 {"Localhost.Localdomain", "myhostname", hostLookupCgo}, 272 {"anything.localhost.localdomain", "myhostname", hostLookupCgo}, 273 {"Anything.Localhost.Localdomain", "myhostname", hostLookupCgo}, 274 {"somehostname", "myhostname", hostLookupFilesDNS}, 275 {"", "myhostname", hostLookupFilesDNS}, // Issue 13623 276 }, 277 }, 278 { 279 name: "ubuntu14.04.02", 280 c: &conf{ 281 nss: nssStr("hosts: files myhostname mdns4_minimal [NOTFOUND=return] dns mdns4"), 282 resolv: defaultResolvConf, 283 }, 284 hostTests: []nssHostTest{ 285 {"x.com", "myhostname", hostLookupFilesDNS}, 286 {"somehostname", "myhostname", hostLookupFilesDNS}, 287 {"myhostname", "myhostname", hostLookupCgo}, 288 }, 289 }, 290 // Debian Squeeze is just "dns,files", but lists all 291 // the default criteria for dns, but then has a 292 // non-standard but redundant notfound=return for the 293 // files. 294 { 295 name: "debian_squeeze", 296 c: &conf{ 297 nss: nssStr("hosts: dns [success=return notfound=continue unavail=continue tryagain=continue] files [notfound=return]"), 298 resolv: defaultResolvConf, 299 }, 300 hostTests: []nssHostTest{ 301 {"x.com", "myhostname", hostLookupDNSFiles}, 302 {"somehostname", "myhostname", hostLookupDNSFiles}, 303 }, 304 }, 305 { 306 name: "resolv.conf-unknown", 307 c: &conf{ 308 nss: nssStr("foo: bar"), 309 resolv: &dnsConfig{servers: defaultNS, ndots: 1, timeout: 5, attempts: 2, unknownOpt: true}, 310 }, 311 hostTests: []nssHostTest{{"google.com", "myhostname", hostLookupCgo}}, 312 }, 313 // Android should always use cgo. 314 { 315 name: "android", 316 c: &conf{ 317 goos: "android", 318 nss: nssStr(""), 319 resolv: defaultResolvConf, 320 }, 321 hostTests: []nssHostTest{ 322 {"x.com", "myhostname", hostLookupCgo}, 323 }, 324 }, 325 } 326 327 origGetHostname := getHostname 328 defer func() { getHostname = origGetHostname }() 329 330 for _, tt := range tests { 331 for _, ht := range tt.hostTests { 332 getHostname = func() (string, error) { return ht.localhost, nil } 333 334 gotOrder := tt.c.hostLookupOrder(ht.host) 335 if gotOrder != ht.want { 336 t.Errorf("%s: hostLookupOrder(%q) = %v; want %v", tt.name, ht.host, gotOrder, ht.want) 337 } 338 } 339 } 340 341 } 342 343 func TestSystemConf(t *testing.T) { 344 systemConf() 345 } 346
