1 | /* Test for __libc_res_nsend buffer mismanagent (bug 18665), UDP case. |
2 | Copyright (C) 2016-2022 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 | <https://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 | |
28 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
29 | |
30 | static int initial_address_count; |
31 | static int response_count; |
32 | |
33 | static void |
34 | response (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, name: qname, class: qclass, type: 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 (mutex: &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 (mutex: &lock); |
54 | |
55 | for (int i = 0; i < address_count; ++i) |
56 | { |
57 | resolv_response_open_record (b, name: qname, class: qclass, type: qtype, ttl: 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 (format: "error: unexpected QTYPE: %s/%u/%u\n" , |
79 | qname, qclass, qtype); |
80 | } |
81 | resolv_response_close_record (b); |
82 | } |
83 | } |
84 | |
85 | static void |
86 | test_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 (name: "www.example" , service: "80" , req: &hints, pai: &ai); |
98 | if (ret == 0) |
99 | freeaddrinfo (ai: ai); |
100 | |
101 | response_count = 0; |
102 | ret = getaddrinfo (name: "www123.example" , service: "80" , req: &hints, pai: &ai); |
103 | if (ret == 0) |
104 | freeaddrinfo (ai: ai); |
105 | |
106 | response_count = 0; |
107 | ret = getaddrinfo (name: "www1234.example" , service: "80" , req: &hints, pai: &ai); |
108 | if (ret == 0) |
109 | freeaddrinfo (ai: ai); |
110 | |
111 | response_count = 0; |
112 | ret = getaddrinfo (name: "www12345.example" , service: "80" , req: &hints, pai: &ai); |
113 | if (ret == 0) |
114 | freeaddrinfo (ai: ai); |
115 | } |
116 | |
117 | static int |
118 | do_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 | |