/* Test handling of binary domain names with res_send.

   Copyright (C) 2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <resolv.h>

#include <string.h>

#include <support/check.h>

#include <support/resolv_test.h>

static void

response (const struct resolv_response_context *ctx,

          struct resolv_response_builder *b,

          const char *qname, uint16_t qclass, uint16_t qtype)

{

  TEST_COMPARE (qclass, C_IN);

  TEST_COMPARE (qtype, T_TXT);

  TEST_VERIFY (strlen (qname) <= 255);

  struct resolv_response_flags flags = { 0 };

  resolv_response_init (b, flags);

  resolv_response_add_question (b, qname, qclass, qtype);

  resolv_response_section (b, ns_s_an);

  resolv_response_open_record (b, qname, qclass, T_TXT, 0x12345678);

  unsigned char qnamelen = strlen (qname);

  resolv_response_add_data (b, &qnamelen, 1);

  resolv_response_add_data (b, qname, qnamelen);

  resolv_response_close_record (b);

}

static int

do_test (void)

{

  struct resolv_test *aux = resolv_test_start

    ((struct resolv_redirect_config)

     {

       .response_callback = response,

     });

  for (int b = 0; b <= 255; ++b)

    {

      unsigned char query[] =

        {

          b, b,                 /* Transaction ID.  */

          1, 0,                 /* Query with RD flag.  */

          0, 1,                 /* One question.  */

          0, 0, 0, 0, 0, 0,     /* The other sections are empty.  */

          1, b, 7, 'e', 'x', 'a', 'm', 'p', 'l', 'e', 0,

          0, T_TXT,             /* TXT query.  */

          0, 1,                 /* Class IN.  */

        };

      unsigned char response[512];

      int ret = res_send (query, sizeof (query), response, sizeof (response));

      char expected_name[20];

      /* The name is uncompressed in the query, so we can reference it

         directly.  */

      TEST_VERIFY_EXIT (ns_name_ntop (query + 12, expected_name,

                                      sizeof (expected_name)) >= 0);

      TEST_COMPARE (ret,

                    (ssize_t) sizeof (query)

                    + 2             /* Compression reference.  */

                    + 2 + 2 + 4 + 2 /* Type, class, TTL, RDATA length.  */

                    + 1             /* Pascal-style string length.  */

                    + strlen (expected_name));

      /* Mark as answer, with recursion available, and one answer.  */

      query[2] = 0x81;

      query[3] = 0x80;

      query[7] = 1;

      /* Prefix of the response must match the query.  */

      TEST_COMPARE (memcmp (response, query, sizeof (query)), 0);

      /* The actual answer follows, starting with the compression

         reference.  */

      unsigned char *p = response + sizeof (query);

      TEST_COMPARE (*p++, 0xc0);

      TEST_COMPARE (*p++, 0x0c);

      /* Type and class.  */

      TEST_COMPARE (*p++, 0);

      TEST_COMPARE (*p++, T_TXT);

      TEST_COMPARE (*p++, 0);

      TEST_COMPARE (*p++, C_IN);

      /* TTL.  */

      TEST_COMPARE (*p++, 0x12);

      TEST_COMPARE (*p++, 0x34);

      TEST_COMPARE (*p++, 0x56);

      TEST_COMPARE (*p++, 0x78);

      /* RDATA length.  */

      TEST_COMPARE (*p++, 0);

      TEST_COMPARE (*p++, 1 + strlen (expected_name));

      /* RDATA.  */

      TEST_COMPARE (*p++, strlen (expected_name));

      TEST_COMPARE (memcmp (p, expected_name, strlen (expected_name)), 0);

    }

  resolv_test_end (aux);

  return 0;

}

#include <support/test-driver.c>