1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
/* Test for __libc_res_nsend buffer mismanagent (bug 18665), UDP case.
Copyright (C) 2016-2021 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <netdb.h>
#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include <support/check.h>
#include <support/resolv_test.h>
#include <support/xthread.h>
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static int initial_address_count;
static int response_count;
static void
response (const struct resolv_response_context *ctx,
struct resolv_response_builder *b,
const char *qname, uint16_t qclass, uint16_t qtype)
{
TEST_VERIFY_EXIT (qname != NULL);
struct resolv_response_flags flags = {};
resolv_response_init (b, flags);
resolv_response_add_question (b, qname, qclass, qtype);
resolv_response_section (b, ns_s_an);
/* Add many A/AAAA records to the second response. */
int address_count;
xpthread_mutex_lock (&lock);
if (response_count == 0)
address_count = initial_address_count;
else
address_count = 2000;
++response_count;
xpthread_mutex_unlock (&lock);
for (int i = 0; i < address_count; ++i)
{
resolv_response_open_record (b, qname, qclass, qtype, 0);
switch (qtype)
{
case T_A:
{
char ipv4[4] = {10, i >> 8, i, 0};
ipv4[3] = 2 * ctx->tcp + 4 * ctx->server_index;
resolv_response_add_data (b, &ipv4, sizeof (ipv4));
}
break;
case T_AAAA:
{
char ipv6[16]
= {0x20, 0x01, 0xd, 0xb8, 0, 0, 0, 0, 0, 0, 0, 0, 0,
i >> 8, i, 0};
ipv6[15] = 2 * ctx->tcp + 4 * ctx->server_index;
resolv_response_add_data (b, &ipv6, sizeof (ipv6));
}
break;
default:
support_record_failure ();
printf ("error: unexpected QTYPE: %s/%u/%u\n",
qname, qclass, qtype);
}
resolv_response_close_record (b);
}
}
static void
test_different_sizes (void)
{
struct addrinfo hints = { .ai_family = AF_UNSPEC, };
struct addrinfo *ai;
int ret;
/* This magic number produces a response size close to 2048
bytes. */
initial_address_count = 126;
response_count = 0;
ret = getaddrinfo ("www.example", "80", &hints, &ai);
if (ret == 0)
freeaddrinfo (ai);
response_count = 0;
ret = getaddrinfo ("www123.example", "80", &hints, &ai);
if (ret == 0)
freeaddrinfo (ai);
response_count = 0;
ret = getaddrinfo ("www1234.example", "80", &hints, &ai);
if (ret == 0)
freeaddrinfo (ai);
response_count = 0;
ret = getaddrinfo ("www12345.example", "80", &hints, &ai);
if (ret == 0)
freeaddrinfo (ai);
}
static int
do_test (void)
{
struct resolv_test *obj = resolv_test_start
((struct resolv_redirect_config)
{
.response_callback = response
});
test_different_sizes ();
_res.options |= RES_SNGLKUP;
test_different_sizes ();
_res.options |= RES_SNGLKUPREOP;
test_different_sizes ();
resolv_test_end (obj);
return 0;
}
#include <support/test-driver.c>
|
