resolv/tst-resolv-basic.c

   1 /* Test basic nss_dns functionality and the resolver test harness itself.
   2    Copyright (C) 2016-2017 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 #include <errno.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <support/check.h>
  24 #include <support/check_nss.h>
  25 #include <support/resolv_test.h>
  26 #include <support/support.h>
  27
  28 static void
  29 response (const struct resolv_response_context *ctx,
  30           struct resolv_response_builder *b,
  31           const char *qname, uint16_t qclass, uint16_t qtype)
  32 {
  33   TEST_VERIFY_EXIT (qname != NULL);
  34
  35   /* The "t." prefix can be used to request TCP fallback.  */
  36   bool force_tcp;
  37   if (strncmp ("t.", qname, 2) == 0)
  38     force_tcp = true;
  39   else
  40     force_tcp = false;
  41   const char *qname_compare;
  42   if (force_tcp)
  43     qname_compare = qname + 2;
  44   else
  45     qname_compare = qname;
  46   enum {www, alias, nxdomain} requested_qname;
  47   if (strcmp (qname_compare, "www.example") == 0)
  48     requested_qname = www;
  49   else if (strcmp (qname_compare, "alias.example") == 0)
  50     requested_qname = alias;
  51   else if (strcmp (qname_compare, "nxdomain.example") == 0)
  52     requested_qname = nxdomain;
  53   else
  54     {
  55       support_record_failure ();
  56       printf ("error: unexpected QNAME: %s\n", qname);
  57       return;
  58     }
  59   TEST_VERIFY_EXIT (qclass == C_IN);
  60   struct resolv_response_flags flags = {.tc = force_tcp && !ctx->tcp};
  61   if (requested_qname == nxdomain)
  62     flags.rcode = 3;            /* NXDOMAIN */
  63   resolv_response_init (b, flags);
  64   resolv_response_add_question (b, qname, qclass, qtype);
  65   if (requested_qname == nxdomain || flags.tc)
  66     return;
  67
  68   resolv_response_section (b, ns_s_an);
  69   switch (requested_qname)
  70     {
  71     case www:
  72       resolv_response_open_record (b, qname, qclass, qtype, 0);
  73       break;
  74     case alias:
  75       resolv_response_open_record (b, qname, qclass, T_CNAME, 0);
  76       resolv_response_add_name (b, "www.example");
  77       resolv_response_close_record (b);
  78       resolv_response_open_record (b, "www.example", qclass, qtype, 0);
  79       break;
  80     case nxdomain:
  81       FAIL_EXIT1 ("unreachable");
  82     }
  83   switch (qtype)
  84     {
  85     case T_A:
  86       {
  87         char ipv4[4] = {192, 0, 2, 17};
  88         ipv4[3] += requested_qname + 2 * ctx->tcp + 4 * ctx->server_index;
  89         resolv_response_add_data (b, &ipv4, sizeof (ipv4));
  90       }
  91       break;
  92     case T_AAAA:
  93       {
  94         char ipv6[16]
  95           = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1};
  96         ipv6[15] += requested_qname + 2 * ctx->tcp + 4 * ctx->server_index;
  97         resolv_response_add_data (b, &ipv6, sizeof (ipv6));
  98       }
  99       break;
 100     default:
 101       support_record_failure ();
 102       printf ("error: unexpected QTYPE: %s/%u/%u\n",
 103               qname, qclass, qtype);
 104     }
 105   resolv_response_close_record (b);
 106 }
 107
 108 static void
 109 check_h (const char *name, int family, const char *expected)
 110 {
 111   if (family == AF_INET)
 112     {
 113       char *query = xasprintf ("gethostbyname (\"%s\")", name);
 114       check_hostent (query, gethostbyname (name), expected);
 115       free (query);
 116     }
 117   {
 118     char *query = xasprintf ("gethostbyname2 (\"%s\", %d)", name, family);
 119     check_hostent (query, gethostbyname2 (name, family), expected);
 120     free (query);
 121   }
 122
 123   bool too_small = true;
 124   for (unsigned int offset = 0; offset < 8; ++offset)
 125     for (unsigned int size = 1; too_small; ++size)
 126       {
 127         char *buf = xmalloc (offset + size);
 128         too_small = false;
 129
 130         struct hostent hostbuf;
 131         struct hostent *result;
 132         int herror;
 133         if (family == AF_INET)
 134           {
 135             char *query = xasprintf ("gethostbyname (\"%s\") %u/%u",
 136                                      name, offset, size);
 137             int ret = gethostbyname_r
 138               (name, &hostbuf, buf + offset, size, &result, &herror);
 139             if (ret == 0)
 140               {
 141                 h_errno = herror;
 142                 check_hostent (query, result, expected);
 143               }
 144             else if (ret == ERANGE)
 145               too_small = true;
 146             else
 147               {
 148                 errno = ret;
 149                 FAIL_EXIT1 ("gethostbyname_r: %m");
 150               }
 151             free (query);
 152             memset (buf, 0, offset + size);
 153           }
 154         char *query = xasprintf ("gethostbyname2 (\"%s\", %d) %u/%u",
 155                                  name, family, offset, size);
 156         int ret = gethostbyname2_r
 157           (name, family, &hostbuf, buf + offset, size, &result, &herror);
 158         if (ret == 0)
 159           {
 160             h_errno = herror;
 161             check_hostent (query, result, expected);
 162           }
 163         else if (ret == ERANGE)
 164           too_small = true;
 165         else
 166           {
 167             errno = ret;
 168             FAIL_EXIT1 ("gethostbyname_r: %m");
 169           }
 170         free (buf);
 171         free (query);
 172       }
 173 }
 174
 175 static void
 176 check_ai (const char *name, const char *service,
 177           int family, const char *expected)
 178 {
 179   struct addrinfo hints = {.ai_family = family};
 180   struct addrinfo *ai;
 181   char *query = xasprintf ("%s:%s [%d]", name, service, family);
 182   int ret = getaddrinfo (name, service, &hints, &ai);
 183   check_addrinfo (query, ai, ret, expected);
 184   if (ret == 0)
 185     freeaddrinfo (ai);
 186   free (query);
 187 }
 188
 189 static int
 190 do_test (void)
 191 {
 192   struct resolv_test *aux = resolv_test_start
 193     ((struct resolv_redirect_config)
 194      {
 195        .response_callback = response,
 196      });
 197
 198   check_h ("www.example", AF_INET,
 199            "name: www.example\n"
 200            "address: 192.0.2.17\n");
 201   check_h ("alias.example", AF_INET,
 202            "name: www.example\n"
 203            "alias: alias.example\n"
 204            "address: 192.0.2.18\n");
 205   check_h ("www.example", AF_INET6,
 206            "name: www.example\n"
 207            "address: 2001:db8::1\n");
 208   check_h ("alias.example", AF_INET6,
 209            "name: www.example\n"
 210            "alias: alias.example\n"
 211            "address: 2001:db8::2\n");
 212   check_ai ("www.example", "80", AF_UNSPEC,
 213             "address: STREAM/TCP 192.0.2.17 80\n"
 214             "address: DGRAM/UDP 192.0.2.17 80\n"
 215             "address: RAW/IP 192.0.2.17 80\n"
 216             "address: STREAM/TCP 2001:db8::1 80\n"
 217             "address: DGRAM/UDP 2001:db8::1 80\n"
 218             "address: RAW/IP 2001:db8::1 80\n");
 219   check_ai ("alias.example", "80", AF_UNSPEC,
 220             "address: STREAM/TCP 192.0.2.18 80\n"
 221             "address: DGRAM/UDP 192.0.2.18 80\n"
 222             "address: RAW/IP 192.0.2.18 80\n"
 223             "address: STREAM/TCP 2001:db8::2 80\n"
 224             "address: DGRAM/UDP 2001:db8::2 80\n"
 225             "address: RAW/IP 2001:db8::2 80\n");
 226   check_ai ("www.example", "80", AF_INET,
 227             "address: STREAM/TCP 192.0.2.17 80\n"
 228             "address: DGRAM/UDP 192.0.2.17 80\n"
 229             "address: RAW/IP 192.0.2.17 80\n");
 230   check_ai ("alias.example", "80", AF_INET,
 231             "address: STREAM/TCP 192.0.2.18 80\n"
 232             "address: DGRAM/UDP 192.0.2.18 80\n"
 233             "address: RAW/IP 192.0.2.18 80\n");
 234   check_ai ("www.example", "80", AF_INET6,
 235             "address: STREAM/TCP 2001:db8::1 80\n"
 236             "address: DGRAM/UDP 2001:db8::1 80\n"
 237             "address: RAW/IP 2001:db8::1 80\n");
 238   check_ai ("alias.example", "80", AF_INET6,
 239             "address: STREAM/TCP 2001:db8::2 80\n"
 240             "address: DGRAM/UDP 2001:db8::2 80\n"
 241             "address: RAW/IP 2001:db8::2 80\n");
 242
 243   check_h ("t.www.example", AF_INET,
 244            "name: t.www.example\n"
 245            "address: 192.0.2.19\n");
 246   check_h ("t.alias.example", AF_INET,
 247            "name: www.example\n"
 248            "alias: t.alias.example\n"
 249            "address: 192.0.2.20\n");
 250   check_h ("t.www.example", AF_INET6,
 251            "name: t.www.example\n"
 252            "address: 2001:db8::3\n");
 253   check_h ("t.alias.example", AF_INET6,
 254            "name: www.example\n"
 255            "alias: t.alias.example\n"
 256            "address: 2001:db8::4\n");
 257   check_ai ("t.www.example", "80", AF_UNSPEC,
 258             "address: STREAM/TCP 192.0.2.19 80\n"
 259             "address: DGRAM/UDP 192.0.2.19 80\n"
 260             "address: RAW/IP 192.0.2.19 80\n"
 261             "address: STREAM/TCP 2001:db8::3 80\n"
 262             "address: DGRAM/UDP 2001:db8::3 80\n"
 263             "address: RAW/IP 2001:db8::3 80\n");
 264   check_ai ("t.alias.example", "80", AF_UNSPEC,
 265             "address: STREAM/TCP 192.0.2.20 80\n"
 266             "address: DGRAM/UDP 192.0.2.20 80\n"
 267             "address: RAW/IP 192.0.2.20 80\n"
 268             "address: STREAM/TCP 2001:db8::4 80\n"
 269             "address: DGRAM/UDP 2001:db8::4 80\n"
 270             "address: RAW/IP 2001:db8::4 80\n");
 271   check_ai ("t.www.example", "80", AF_INET,
 272             "address: STREAM/TCP 192.0.2.19 80\n"
 273             "address: DGRAM/UDP 192.0.2.19 80\n"
 274             "address: RAW/IP 192.0.2.19 80\n");
 275   check_ai ("t.alias.example", "80", AF_INET,
 276             "address: STREAM/TCP 192.0.2.20 80\n"
 277             "address: DGRAM/UDP 192.0.2.20 80\n"
 278             "address: RAW/IP 192.0.2.20 80\n");
 279   check_ai ("t.www.example", "80", AF_INET6,
 280             "address: STREAM/TCP 2001:db8::3 80\n"
 281             "address: DGRAM/UDP 2001:db8::3 80\n"
 282             "address: RAW/IP 2001:db8::3 80\n");
 283   check_ai ("t.alias.example", "80", AF_INET6,
 284             "address: STREAM/TCP 2001:db8::4 80\n"
 285             "address: DGRAM/UDP 2001:db8::4 80\n"
 286             "address: RAW/IP 2001:db8::4 80\n");
 287
 288   check_h ("nxdomain.example", AF_INET,
 289            "error: HOST_NOT_FOUND\n");
 290   check_h ("nxdomain.example", AF_INET6,
 291            "error: HOST_NOT_FOUND\n");
 292   check_ai ("nxdomain.example", "80", AF_UNSPEC,
 293             "error: Name or service not known\n");
 294   check_ai ("nxdomain.example", "80", AF_INET,
 295             "error: Name or service not known\n");
 296   check_ai ("nxdomain.example", "80", AF_INET6,
 297             "error: Name or service not known\n");
 298
 299   check_h ("t.nxdomain.example", AF_INET,
 300            "error: HOST_NOT_FOUND\n");
 301   check_h ("t.nxdomain.example", AF_INET6,
 302            "error: HOST_NOT_FOUND\n");
 303   check_ai ("t.nxdomain.example", "80", AF_UNSPEC,
 304             "error: Name or service not known\n");
 305   check_ai ("t.nxdomain.example", "80", AF_INET,
 306             "error: Name or service not known\n");
 307   check_ai ("t.nxdomain.example", "80", AF_INET6,
 308             "error: Name or service not known\n");
 309
 310   resolv_test_end (aux);
 311
 312   return 0;
 313 }
 314
 315 #include <support/test-driver.c>