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1/* Test for __libc_res_nsend buffer mismanagent (bug 18665), UDP case.
2 Copyright (C) 2016-2019 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 <netdb.h>
21#include <resolv.h>
22#include <stdio.h>
23#include <string.h>
24#include <support/check.h>
25#include <support/resolv_test.h>
26#include <support/xthread.h>
27
28static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
29
30static int initial_address_count;
31static int response_count;
32
33static void
34response (const struct resolv_response_context *ctx,
35 struct resolv_response_builder *b,
36 const char *qname, uint16_t qclass, uint16_t qtype)
37{
38 TEST_VERIFY_EXIT (qname != NULL);
39 struct resolv_response_flags flags = {};
40 resolv_response_init (b, flags);
41 resolv_response_add_question (b, qname, qclass, qtype);
42
43 resolv_response_section (b, ns_s_an);
44
45 /* Add many A/AAAA records to the second response. */
46 int address_count;
47 xpthread_mutex_lock (&lock);
48 if (response_count == 0)
49 address_count = initial_address_count;
50 else
51 address_count = 2000;
52 ++response_count;
53 xpthread_mutex_unlock (&lock);
54
55 for (int i = 0; i < address_count; ++i)
56 {
57 resolv_response_open_record (b, qname, qclass, qtype, 0);
58 switch (qtype)
59 {
60 case T_A:
61 {
62 char ipv4[4] = {10, i >> 8, i, 0};
63 ipv4[3] = 2 * ctx->tcp + 4 * ctx->server_index;
64 resolv_response_add_data (b, &ipv4, sizeof (ipv4));
65 }
66 break;
67 case T_AAAA:
68 {
69 char ipv6[16]
70 = {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0,
71 i >> 8, i, 0};
72 ipv6[15] = 2 * ctx->tcp + 4 * ctx->server_index;
73 resolv_response_add_data (b, &ipv6, sizeof (ipv6));
74 }
75 break;
76 default:
77 support_record_failure ();
78 printf ("error: unexpected QTYPE: %s/%u/%u\n",
79 qname, qclass, qtype);
80 }
81 resolv_response_close_record (b);
82 }
83}
84
85static void
86test_different_sizes (void)
87{
88 struct addrinfo hints = { .ai_family = AF_UNSPEC, };
89 struct addrinfo *ai;
90 int ret;
91
92 /* This magic number produces a response size close to 2048
93 bytes. */
94 initial_address_count = 126;
95 response_count = 0;
96
97 ret = getaddrinfo ("www.example", "80", &hints, &ai);
98 if (ret == 0)
99 freeaddrinfo (ai);
100
101 response_count = 0;
102 ret = getaddrinfo ("www123.example", "80", &hints, &ai);
103 if (ret == 0)
104 freeaddrinfo (ai);
105
106 response_count = 0;
107 ret = getaddrinfo ("www1234.example", "80", &hints, &ai);
108 if (ret == 0)
109 freeaddrinfo (ai);
110
111 response_count = 0;
112 ret = getaddrinfo ("www12345.example", "80", &hints, &ai);
113 if (ret == 0)
114 freeaddrinfo (ai);
115}
116
117static int
118do_test (void)
119{
120 struct resolv_test *obj = resolv_test_start
121 ((struct resolv_redirect_config)
122 {
123 .response_callback = response
124 });
125
126 test_different_sizes ();
127
128 _res.options |= RES_SNGLKUP;
129 test_different_sizes ();
130
131 _res.options |= RES_SNGLKUPREOP;
132 test_different_sizes ();
133
134 resolv_test_end (obj);
135 return 0;
136}
137
138#include <support/test-driver.c>
139

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