docs: cmake build
[m6w6/libmemcached] / libtest / dns.cc
1 /* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
2 *
3 * Data Differential YATL (i.e. libtest) library
4 *
5 * Copyright (C) 2012 Data Differential, http://datadifferential.com/
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * * Redistributions in binary form must reproduce the above
15 * copyright notice, this list of conditions and the following disclaimer
16 * in the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * * The names of its contributors may not be used to endorse or
20 * promote products derived from this software without specific prior
21 * written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
24 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
25 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
26 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
27 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
29 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
30 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
32 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
33 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 *
35 */
36
37 #include "libtest/yatlcon.h"
38 #include <libtest/common.h>
39
40 #include <sys/types.h>
41 #include <sys/socket.h>
42 #include <netdb.h>
43
44 namespace libtest {
45
46 bool lookup(const char* host)
47 {
48 bool success= false;
49 assert(host and host[0]);
50 if (host and host[0])
51 {
52 struct addrinfo *addrinfo= NULL;
53 struct addrinfo hints;
54 memset(&hints, 0, sizeof(hints));
55 hints.ai_socktype= SOCK_STREAM;
56 hints.ai_protocol= IPPROTO_TCP;
57
58 int limit= 5;
59 while (--limit and success == false)
60 {
61 if (addrinfo)
62 {
63 freeaddrinfo(addrinfo);
64 addrinfo= NULL;
65 }
66
67 int ret;
68 if ((ret= getaddrinfo(host, "echo", &hints, &addrinfo)) == 0)
69 {
70 success= true;
71 break;
72 }
73
74 switch (ret)
75 {
76 case EAI_AGAIN:
77 continue;
78
79 case EAI_NONAME:
80 default:
81 break;
82 }
83
84 break;
85 }
86
87 if (addrinfo)
88 {
89 freeaddrinfo(addrinfo);
90 }
91 }
92
93 return success;
94 }
95
96
97 bool check_dns()
98 {
99 if (valgrind_is_caller())
100 {
101 return false;
102 }
103
104 if (lookup("exist.gearman.info") == false)
105 {
106 return false;
107 }
108
109 if (lookup("does_not_exist.gearman.info")) // This should fail, if it passes,...
110 {
111 fatal_assert("Your service provider sucks and is providing bogus DNS. You might be in an airport.");
112 }
113
114 return true;
115 }
116
117 } // namespace libtest
118