resolv/tst-resolv-ai_idn-common.c

   1 /* Common code for AI_IDN/NI_IDN tests.
   2    Copyright (C) 2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 /* Before including this file, TEST_USE_UTF8 must be defined to 1 or
  20    0, depending on whether a UTF-8 locale is used or a Latin-1
  21    locale.  */
  22
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <support/check.h>
  27 #include <support/check_nss.h>
  28 #include <support/resolv_test.h>
  29 #include <support/support.h>
  30
  31 /* Name of the shared object for libidn2.  */
  32 #define LIBIDN2_SONAME "libidn2.so.0"
  33
  34 #if TEST_USE_UTF8
  35 /* UTF-8 encoding of "nämchen" (German for “namelet”).  */
  36 # define NAEMCHEN "n\xC3\xA4mchen"
  37
  38 /* UTF-8 encoding of "שם" (Hebrew for “name”).  */
  39 # define SHEM "\xD7\xA9\xD7\x9D"
  40
  41 /* UTF-8 encoding of "buße" (German for “penance”).  This used to be
  42    encoded as "busse" (“busses”) in IDNA2003.  */
  43 # define BUSSE "bu\xC3\x9F""e"
  44
  45 #else
  46 /* Latin-1 encodings, as far as they are available.  */
  47
  48 # define NAEMCHEN "n\xE4mchen"
  49 # define BUSSE "bu\xDF""e"
  50
  51 #endif
  52
  53 /* IDNA encoding of NAEMCHEN.  */
  54 #define NAEMCHEN_IDNA "xn--nmchen-bua"
  55
  56 /* IDNA encoding of NAEMCHEN "_zwo".  */
  57 #define NAEMCHEN_ZWO_IDNA "xn--nmchen_zwo-q5a"
  58
  59 /* IDNA encoding of SHEM.  */
  60 #define SHEM_IDNA "xn--iebx"
  61
  62 /* IDNA encoding of BUSSE.  */
  63 #define BUSSE_IDNA "xn--bue-6ka"
  64
  65 /* IDNA encoding of "שם1".  */
  66 #define SHEM1_IDNA "xn--1-qic9a"
  67
  68 /* Another IDNA name.  */
  69 #define ANDERES_NAEMCHEN "anderes-" NAEMCHEN
  70 #define ANDERES_NAEMCHEN_IDNA "xn--anderes-nmchen-eib"
  71
  72 /* Controls the kind of test data in a PTR lookup response.  */
  73 enum gni_test
  74   {
  75     gni_non_idn_name,
  76     gni_non_idn_cname_to_non_idn_name,
  77     gni_non_idn_cname_to_idn_name,
  78     gni_idn_name,
  79     gni_idn_shem,
  80     gni_idn_shem1,
  81     gni_idn_cname_to_non_idn_name,
  82     gni_idn_cname_to_idn_name,
  83     gni_invalid_idn_1,
  84     gni_invalid_idn_2,
  85   };
  86
  87 /* Called from response below.  The LSB (first byte) controls what
  88    goes into the response, see enum gni_test.  */
  89 static void
  90 response_ptr (const struct resolv_response_context *ctx,
  91               struct resolv_response_builder *b, const char *qname)
  92 {
  93   int comp[4] = { 0 };
  94   TEST_COMPARE (sscanf (qname, "%d.%d.%d.%d.in-addr.arpa",
  95                         &comp[0], &comp[1], &comp[2], &comp[3]), 4);
  96   const char *next_name;
  97   switch ((enum gni_test) comp[0])
  98     {
  99     /* First name in response is non-IDN name.  */
 100     case gni_non_idn_name:
 101       resolv_response_open_record (b, qname, C_IN, T_PTR, 0);
 102       resolv_response_add_name (b, "non-idn.example");
 103       resolv_response_close_record (b);
 104       return;
 105     case gni_non_idn_cname_to_non_idn_name:
 106       resolv_response_open_record (b, qname, C_IN, T_CNAME, 0);
 107       next_name = "non-idn-cname.example";
 108       resolv_response_add_name (b, next_name);
 109       resolv_response_close_record (b);
 110       resolv_response_open_record (b, next_name, C_IN, T_PTR, 0);
 111       resolv_response_add_name (b, "non-idn-name.example");
 112       resolv_response_close_record (b);
 113       return;
 114     case gni_non_idn_cname_to_idn_name:
 115       resolv_response_open_record (b, qname, C_IN, T_CNAME, 0);
 116       next_name = "non-idn-cname.example";
 117       resolv_response_add_name (b, next_name);
 118       resolv_response_close_record (b);
 119       resolv_response_open_record (b, next_name, C_IN, T_PTR, 0);
 120       resolv_response_add_name (b, NAEMCHEN_IDNA ".example");
 121       resolv_response_close_record (b);
 122       return;
 123
 124     /* First name in response is IDN name.  */
 125     case gni_idn_name:
 126       resolv_response_open_record (b, qname, C_IN, T_PTR, 0);
 127       resolv_response_add_name (b, "xn--nmchen-bua.example");
 128       resolv_response_close_record (b);
 129       return;
 130     case gni_idn_shem:
 131       resolv_response_open_record (b, qname, C_IN, T_PTR, 0);
 132       resolv_response_add_name (b, SHEM_IDNA ".example");
 133       resolv_response_close_record (b);
 134       return;
 135     case gni_idn_shem1:
 136       resolv_response_open_record (b, qname, C_IN, T_PTR, 0);
 137       resolv_response_add_name (b, SHEM1_IDNA ".example");
 138       resolv_response_close_record (b);
 139       return;
 140     case gni_idn_cname_to_non_idn_name:
 141       resolv_response_open_record (b, qname, C_IN, T_CNAME, 0);
 142       next_name = NAEMCHEN_IDNA ".example";
 143       resolv_response_add_name (b, next_name);
 144       resolv_response_close_record (b);
 145       resolv_response_open_record (b, next_name, C_IN, T_PTR, 0);
 146       resolv_response_add_name (b, "non-idn-name.example");
 147       resolv_response_close_record (b);
 148       return;
 149     case gni_idn_cname_to_idn_name:
 150       resolv_response_open_record (b, qname, C_IN, T_CNAME, 0);
 151       next_name = NAEMCHEN_IDNA ".example";
 152       resolv_response_add_name (b, next_name);
 153       resolv_response_close_record (b);
 154       resolv_response_open_record (b, next_name, C_IN, T_PTR, 0);
 155       resolv_response_add_name (b, ANDERES_NAEMCHEN_IDNA ".example");
 156       resolv_response_close_record (b);
 157       return;
 158
 159     /* Invalid IDN encodings.  */
 160     case gni_invalid_idn_1:
 161       resolv_response_open_record (b, qname, C_IN, T_PTR, 0);
 162       resolv_response_add_name (b, "xn---.example");
 163       resolv_response_close_record (b);
 164       return;
 165     case gni_invalid_idn_2:
 166       resolv_response_open_record (b, qname, C_IN, T_PTR, 0);
 167       resolv_response_add_name (b, "xn--x.example");
 168       resolv_response_close_record (b);
 169       return;
 170     }
 171   FAIL_EXIT1 ("invalid PTR query: %s", qname);
 172 }
 173
 174 /* For PTR responses, see above.  A/AAAA queries can request
 175    additional CNAMEs in the response by include ".cname." and
 176    ".idn-cname." in the query.  The LSB in the address contains the
 177    first byte of the QNAME.  */
 178 static void
 179 response (const struct resolv_response_context *ctx,
 180           struct resolv_response_builder *b,
 181           const char *qname, uint16_t qclass, uint16_t qtype)
 182 {
 183   TEST_VERIFY_EXIT (qclass == C_IN);
 184
 185   for (const char *p = qname; *p != '\0'; ++p)
 186     if (!(('0' <= *p && *p <= '9')
 187           || ('a' <= *p && *p <= 'z')
 188           || ('A' <= *p && *p <= 'Z')
 189           || *p == '.' || *p == '-' || *p == '_'))
 190       {
 191         /* Non-ASCII query.  Reply with NXDOMAIN.  */
 192         struct resolv_response_flags flags = { .rcode = 3 };
 193         resolv_response_init (b, flags);
 194         resolv_response_add_question (b, qname, qclass, qtype);
 195         return;
 196       }
 197
 198   struct resolv_response_flags flags = { 0 };
 199   resolv_response_init (b, flags);
 200   resolv_response_add_question (b, qname, qclass, qtype);
 201   resolv_response_section (b, ns_s_an);
 202
 203   if (qtype == T_PTR)
 204     {
 205       response_ptr (ctx, b, qname);
 206       return;
 207     }
 208
 209   bool with_cname = strstr (qname, ".cname.") != NULL;
 210   bool with_idn_cname = strstr (qname, ".idn-cname.") != NULL;
 211
 212   const char *next_name = qname;
 213   if (with_cname)
 214     {
 215       next_name = "non-idn-cname.example";
 216       resolv_response_open_record (b, qname, C_IN, T_CNAME, 0);
 217       resolv_response_add_name (b, next_name);
 218       resolv_response_close_record (b);
 219     }
 220   if (with_idn_cname)
 221     {
 222       next_name = ANDERES_NAEMCHEN_IDNA ".example";
 223       resolv_response_open_record (b, qname, C_IN, T_CNAME, 0);
 224       resolv_response_add_name (b, next_name);
 225       resolv_response_close_record (b);
 226     }
 227
 228   resolv_response_open_record (b, next_name, C_IN, qtype, 0);
 229   switch (qtype)
 230     {
 231     case T_A:
 232       {
 233         char addr[4] = { 192, 0, 2, qname[0] };
 234         resolv_response_add_data (b, &addr, sizeof (addr));
 235       }
 236       break;
 237     case T_AAAA:
 238       {
 239         char addr[16]
 240           = { 0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 241               qname[0] };
 242         resolv_response_add_data (b, &addr, sizeof (addr));
 243       }
 244     default:
 245       FAIL_EXIT1 ("invalid qtype: %d", qtype);
 246     }
 247   resolv_response_close_record (b);
 248 }
 249
 250 /* Check the result of a getaddrinfo call.  */
 251 static void
 252 check_ai (const char *name, int ai_flags, const char *expected)
 253 {
 254   struct addrinfo hints =
 255     {
 256       .ai_flags = ai_flags,
 257       .ai_family = AF_INET,
 258       .ai_socktype = SOCK_STREAM,
 259     };
 260   struct addrinfo *ai;
 261   char *query = xasprintf ("%s:80 AF_INET/0x%x", name, ai_flags);
 262   int ret = getaddrinfo (name, "80", &hints, &ai);
 263   check_addrinfo (query, ai, ret, expected);
 264   if (ret == 0)
 265     freeaddrinfo (ai);
 266   free (query);
 267 }
 268
 269 /* Run one getnameinfo test.  FLAGS is automatically augmented with
 270    NI_NUMERICSERV.  */
 271 static void
 272 gni_test (enum gni_test code, unsigned int flags, const char *expected)
 273 {
 274   struct sockaddr_in sin =
 275     {
 276       .sin_family = AF_INET,
 277       .sin_port = htons (80),
 278       .sin_addr = { htonl (0xc0000200 | code) }, /* 192.0.2.0/24 network.  */
 279     };
 280   char host[1024];
 281   char service[1024];
 282   int ret = getnameinfo ((const struct sockaddr *) &sin, sizeof (sin),
 283                          host, sizeof (host), service, sizeof (service),
 284                          flags| NI_NUMERICSERV);
 285   if (ret != 0)
 286     {
 287       if (expected == NULL)
 288         TEST_COMPARE (ret, EAI_IDN_ENCODE);
 289       else
 290         {
 291           support_record_failure ();
 292           printf ("error: getnameinfo failed (code %d, flags 0x%x): %s (%d)\n",
 293                   (int) code, flags, gai_strerror (ret), ret);
 294         }
 295     }
 296   else if (ret == 0 && expected == NULL)
 297     {
 298       support_record_failure ();
 299       printf ("error: getnameinfo unexpected success (code %d, flags 0x%x)\n",
 300               (int) code, flags);
 301     }
 302   else if (strcmp (host, expected) != 0 || strcmp (service, "80") != 0)
 303     {
 304       support_record_failure ();
 305       printf ("error: getnameinfo test failure (code %d, flags 0x%x)\n"
 306               "  expected host:    \"%s\"\n"
 307               "  expected service: \"80\"\n"
 308               "  actual host:      \"%s\"\n"
 309               "  actual service:   \"%s\"\n",
 310               (int) code, flags, expected, host, service);
 311     }
 312 }
 313
 314 /* Tests for getaddrinfo which assume a working libidn2 library.  */
 315 __attribute__ ((unused))
 316 static void
 317 gai_tests_with_libidn2 (void)
 318 {
 319   /* No CNAME.  */
 320   check_ai ("non-idn.example", 0,
 321             "address: STREAM/TCP 192.0.2.110 80\n");
 322   check_ai ("non-idn.example", AI_IDN,
 323             "flags: AI_IDN\n"
 324             "address: STREAM/TCP 192.0.2.110 80\n");
 325   check_ai ("non-idn.example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 326             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 327             "canonname: non-idn.example\n"
 328             "address: STREAM/TCP 192.0.2.110 80\n");
 329
 330   check_ai (NAEMCHEN ".example", 0,
 331             "error: Name or service not known\n");
 332   check_ai (NAEMCHEN ".example", AI_IDN,
 333             "flags: AI_IDN\n"
 334             "address: STREAM/TCP 192.0.2.120 80\n");
 335   check_ai (NAEMCHEN ".example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 336             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 337             "canonname: " NAEMCHEN ".example\n"
 338             "address: STREAM/TCP 192.0.2.120 80\n");
 339
 340 #if TEST_USE_UTF8
 341   check_ai (SHEM ".example", 0,
 342             "error: Name or service not known\n");
 343   check_ai (SHEM ".example", AI_IDN,
 344             "flags: AI_IDN\n"
 345             "address: STREAM/TCP 192.0.2.120 80\n");
 346   check_ai (SHEM ".example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 347             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 348             "canonname: " SHEM ".example\n"
 349             "address: STREAM/TCP 192.0.2.120 80\n");
 350   check_ai (SHEM ".example", AI_IDN | AI_CANONNAME,
 351             "flags: AI_CANONNAME AI_IDN\n"
 352             "canonname: " SHEM_IDNA ".example\n"
 353             "address: STREAM/TCP 192.0.2.120 80\n");
 354   check_ai (SHEM "1.example", AI_IDN,
 355             "flags: AI_IDN\n"
 356             "address: STREAM/TCP 192.0.2.120 80\n");
 357   check_ai (SHEM "1.example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 358             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 359             "canonname: " SHEM "1.example\n"
 360             "address: STREAM/TCP 192.0.2.120 80\n");
 361   check_ai (SHEM "1.example", AI_IDN | AI_CANONNAME,
 362             "flags: AI_CANONNAME AI_IDN\n"
 363             "canonname: " SHEM1_IDNA ".example\n"
 364             "address: STREAM/TCP 192.0.2.120 80\n");
 365 #endif
 366
 367   /* Check that non-transitional mode is active.  German sharp S
 368      should not turn into SS.  */
 369   check_ai (BUSSE ".example", 0,
 370             "error: Name or service not known\n");
 371   check_ai (BUSSE ".example", AI_IDN,
 372             "flags: AI_IDN\n"
 373             "address: STREAM/TCP 192.0.2.120 80\n");
 374   check_ai (BUSSE ".example", AI_IDN | AI_CANONNAME,
 375             "flags: AI_CANONNAME AI_IDN\n"
 376             "canonname: " BUSSE_IDNA ".example\n"
 377             "address: STREAM/TCP 192.0.2.120 80\n");
 378   check_ai (BUSSE ".example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 379             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 380             "canonname: " BUSSE ".example\n"
 381             "address: STREAM/TCP 192.0.2.120 80\n");
 382
 383   /* Check that Unicode TR 46 mode is active.  Underscores should be
 384      permitted in IDNA components.  */
 385   check_ai (NAEMCHEN "_zwo.example", 0,
 386             "error: Name or service not known\n");
 387   check_ai (NAEMCHEN "_zwo.example", AI_IDN,
 388             "flags: AI_IDN\n"
 389             "address: STREAM/TCP 192.0.2.120 80\n");
 390   check_ai (NAEMCHEN "_zwo.example", AI_IDN | AI_CANONNAME,
 391             "flags: AI_CANONNAME AI_IDN\n"
 392             "canonname: " NAEMCHEN_ZWO_IDNA ".example\n"
 393             "address: STREAM/TCP 192.0.2.120 80\n");
 394   check_ai (NAEMCHEN "_zwo.example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 395             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 396             "canonname: " NAEMCHEN "_zwo.example\n"
 397             "address: STREAM/TCP 192.0.2.120 80\n");
 398
 399   /* No CNAME, but already IDN-encoded.  */
 400   check_ai (NAEMCHEN_IDNA ".example", 0,
 401             "address: STREAM/TCP 192.0.2.120 80\n");
 402   check_ai (NAEMCHEN_IDNA ".example", AI_IDN,
 403             "flags: AI_IDN\n"
 404             "address: STREAM/TCP 192.0.2.120 80\n");
 405   check_ai (NAEMCHEN_IDNA ".example", AI_IDN | AI_CANONNAME,
 406             "flags: AI_CANONNAME AI_IDN\n"
 407             "canonname: " NAEMCHEN_IDNA ".example\n"
 408             "address: STREAM/TCP 192.0.2.120 80\n");
 409   check_ai (NAEMCHEN_IDNA ".example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 410             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 411             "canonname: " NAEMCHEN ".example\n"
 412             "address: STREAM/TCP 192.0.2.120 80\n");
 413   check_ai (SHEM_IDNA ".example", 0,
 414             "address: STREAM/TCP 192.0.2.120 80\n");
 415   check_ai (SHEM_IDNA ".example", AI_IDN,
 416             "flags: AI_IDN\n"
 417             "address: STREAM/TCP 192.0.2.120 80\n");
 418   check_ai (SHEM_IDNA ".example", AI_IDN | AI_CANONNAME,
 419             "flags: AI_CANONNAME AI_IDN\n"
 420             "canonname: " SHEM_IDNA ".example\n"
 421             "address: STREAM/TCP 192.0.2.120 80\n");
 422 #if TEST_USE_UTF8
 423   check_ai (SHEM_IDNA ".example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 424             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 425             "canonname: " SHEM ".example\n"
 426             "address: STREAM/TCP 192.0.2.120 80\n");
 427 #else
 428   check_ai (SHEM_IDNA ".example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 429             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 430             "canonname: " SHEM_IDNA ".example\n"
 431             "address: STREAM/TCP 192.0.2.120 80\n");
 432 #endif
 433
 434   /* Invalid IDNA canonical name is returned as-is.  */
 435   check_ai ("xn---.example", AI_CANONNAME | AI_CANONIDN,
 436             "flags: AI_CANONNAME AI_CANONIDN\n"
 437             "canonname: xn---.example\n"
 438             "address: STREAM/TCP 192.0.2.120 80\n");
 439
 440   /* Non-IDN CNAME.  */
 441   check_ai ("with.cname.example", 0,
 442             "address: STREAM/TCP 192.0.2.119 80\n");
 443   check_ai ("with.cname.example", AI_IDN,
 444             "flags: AI_IDN\n"
 445             "address: STREAM/TCP 192.0.2.119 80\n");
 446   check_ai ("with.cname.example", AI_IDN | AI_CANONNAME | AI_CANONIDN,
 447             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 448             "canonname: non-idn-cname.example\n"
 449             "address: STREAM/TCP 192.0.2.119 80\n");
 450
 451   check_ai ("with.cname." NAEMCHEN ".example", 0,
 452             "error: Name or service not known\n");
 453   check_ai ("with.cname." NAEMCHEN ".example", AI_IDN,
 454             "flags: AI_IDN\n"
 455             "address: STREAM/TCP 192.0.2.119 80\n");
 456   check_ai ("with.cname." NAEMCHEN ".example", AI_IDN | AI_CANONNAME,
 457             "flags: AI_CANONNAME AI_IDN\n"
 458             "canonname: non-idn-cname.example\n"
 459             "address: STREAM/TCP 192.0.2.119 80\n");
 460   check_ai ("with.cname." NAEMCHEN ".example",
 461             AI_IDN | AI_CANONNAME | AI_CANONIDN,
 462             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 463             "canonname: non-idn-cname.example\n"
 464             "address: STREAM/TCP 192.0.2.119 80\n");
 465
 466   /* IDN CNAME.  */
 467   check_ai ("With.idn-cname.example", 0,
 468             "address: STREAM/TCP 192.0.2.87 80\n");
 469   check_ai ("With.idn-cname.example", AI_IDN,
 470             "flags: AI_IDN\n"
 471             "address: STREAM/TCP 192.0.2.87 80\n");
 472   check_ai ("With.idn-cname.example", AI_IDN | AI_CANONNAME,
 473             "flags: AI_CANONNAME AI_IDN\n"
 474             "canonname: " ANDERES_NAEMCHEN_IDNA ".example\n"
 475             "address: STREAM/TCP 192.0.2.87 80\n");
 476   check_ai ("With.idn-cname.example",
 477             AI_IDN | AI_CANONNAME | AI_CANONIDN,
 478             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 479             "canonname: " ANDERES_NAEMCHEN ".example\n"
 480             "address: STREAM/TCP 192.0.2.87 80\n");
 481
 482   check_ai ("With.idn-cname." NAEMCHEN ".example", 0,
 483             "error: Name or service not known\n");
 484   check_ai ("With.idn-cname." NAEMCHEN ".example", AI_IDN,
 485             "flags: AI_IDN\n"
 486             "address: STREAM/TCP 192.0.2.119 80\n");
 487   check_ai ("With.idn-cname." NAEMCHEN ".example", AI_IDN | AI_CANONNAME,
 488             "flags: AI_CANONNAME AI_IDN\n"
 489             "canonname: " ANDERES_NAEMCHEN_IDNA ".example\n"
 490             "address: STREAM/TCP 192.0.2.119 80\n");
 491   check_ai ("With.idn-cname." NAEMCHEN ".example",
 492             AI_IDN | AI_CANONNAME | AI_CANONIDN,
 493             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 494             "canonname: " ANDERES_NAEMCHEN ".example\n"
 495             "address: STREAM/TCP 192.0.2.119 80\n");
 496
 497   /* Non-IDN to IDN CNAME chain.  */
 498   check_ai ("both.cname.idn-cname.example", 0,
 499             "address: STREAM/TCP 192.0.2.98 80\n");
 500   check_ai ("both.cname.idn-cname.example", AI_IDN,
 501             "flags: AI_IDN\n"
 502             "address: STREAM/TCP 192.0.2.98 80\n");
 503   check_ai ("both.cname.idn-cname.example", AI_IDN | AI_CANONNAME,
 504             "flags: AI_CANONNAME AI_IDN\n"
 505             "canonname: " ANDERES_NAEMCHEN_IDNA ".example\n"
 506             "address: STREAM/TCP 192.0.2.98 80\n");
 507   check_ai ("both.cname.idn-cname.example",
 508             AI_IDN | AI_CANONNAME | AI_CANONIDN,
 509             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 510             "canonname: " ANDERES_NAEMCHEN ".example\n"
 511             "address: STREAM/TCP 192.0.2.98 80\n");
 512
 513   check_ai ("both.cname.idn-cname." NAEMCHEN ".example", 0,
 514             "error: Name or service not known\n");
 515   check_ai ("both.cname.idn-cname." NAEMCHEN ".example", AI_IDN,
 516             "flags: AI_IDN\n"
 517             "address: STREAM/TCP 192.0.2.98 80\n");
 518   check_ai ("both.cname.idn-cname." NAEMCHEN ".example",
 519             AI_IDN | AI_CANONNAME,
 520             "flags: AI_CANONNAME AI_IDN\n"
 521             "canonname: " ANDERES_NAEMCHEN_IDNA ".example\n"
 522             "address: STREAM/TCP 192.0.2.98 80\n");
 523   check_ai ("both.cname.idn-cname." NAEMCHEN ".example",
 524             AI_IDN | AI_CANONNAME | AI_CANONIDN,
 525             "flags: AI_CANONNAME AI_IDN AI_CANONIDN\n"
 526             "canonname: " ANDERES_NAEMCHEN ".example\n"
 527             "address: STREAM/TCP 192.0.2.98 80\n");
 528 }
 529
 530 /* Tests for getnameinfo which assume a working libidn2 library.  */
 531 __attribute__ ((unused))
 532 static void
 533 gni_tests_with_libidn2 (void)
 534 {
 535   gni_test (gni_non_idn_name, 0, "non-idn.example");
 536   gni_test (gni_non_idn_name, NI_IDN, "non-idn.example");
 537   gni_test (gni_non_idn_name, NI_NUMERICHOST, "192.0.2.0");
 538   gni_test (gni_non_idn_name, NI_NUMERICHOST | NI_IDN, "192.0.2.0");
 539
 540   gni_test (gni_non_idn_cname_to_non_idn_name, 0, "non-idn-name.example");
 541   gni_test (gni_non_idn_cname_to_non_idn_name, NI_IDN, "non-idn-name.example");
 542
 543   gni_test (gni_non_idn_cname_to_idn_name, 0, NAEMCHEN_IDNA ".example");
 544   gni_test (gni_non_idn_cname_to_idn_name, NI_IDN, NAEMCHEN ".example");
 545
 546   gni_test (gni_idn_name, 0, NAEMCHEN_IDNA ".example");
 547   gni_test (gni_idn_name, NI_IDN, NAEMCHEN ".example");
 548   gni_test (gni_idn_shem, 0, SHEM_IDNA ".example");
 549   gni_test (gni_idn_shem1, 0, SHEM1_IDNA ".example");
 550 #if TEST_USE_UTF8
 551   gni_test (gni_idn_shem, NI_IDN, SHEM ".example");
 552   gni_test (gni_idn_shem1, NI_IDN, SHEM "1.example");
 553 #else
 554   gni_test (gni_idn_shem, NI_IDN, SHEM_IDNA ".example");
 555   gni_test (gni_idn_shem1, NI_IDN, SHEM1_IDNA ".example");
 556 #endif
 557
 558   gni_test (gni_idn_cname_to_non_idn_name, 0, "non-idn-name.example");
 559   gni_test (gni_idn_cname_to_non_idn_name, NI_IDN, "non-idn-name.example");
 560
 561   gni_test (gni_idn_cname_to_idn_name, 0, ANDERES_NAEMCHEN_IDNA ".example");
 562   gni_test (gni_idn_cname_to_idn_name, NI_IDN, ANDERES_NAEMCHEN ".example");
 563
 564   /* Test encoding errors.  */
 565   gni_test (gni_invalid_idn_1, 0, "xn---.example");
 566   gni_test (gni_invalid_idn_1, NI_IDN, "xn---.example");
 567   gni_test (gni_invalid_idn_2, 0, "xn--x.example");
 568   gni_test (gni_invalid_idn_2, NI_IDN, "xn--x.example");
 569 }