1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/time.h>
30 #include <sys/socket.h>
31
32 #include <stdio.h>
33 #include <unistd.h>
34
35 #include "probe.h"
36 #include "log.h"
37 #include "id.h"
38
39 struct probe probe;
40
41 /* Does select() alter the passed time value ? */
42 static int
select_changes_time(void)43 select_changes_time(void)
44 {
45 struct timeval t;
46
47 t.tv_sec = 0;
48 t.tv_usec = 100000;
49 select(0, NULL, NULL, NULL, &t);
50 return t.tv_usec != 100000;
51 }
52
53 #ifndef NOINET6
54 static int
ipv6_available(void)55 ipv6_available(void)
56 {
57 int s;
58
59 if ((s = ID0socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
60 return 0;
61
62 close(s);
63 return 1;
64 }
65 #endif
66
67 void
probe_Init(void)68 probe_Init(void)
69 {
70 probe.select_changes_time = select_changes_time() ? 1 : 0;
71 log_Printf(LogDEBUG, "Select changes time: %s\n",
72 probe.select_changes_time ? "yes" : "no");
73 #ifndef NOINET6
74 probe.ipv6_available = ipv6_available() ? 1 : 0;
75 log_Printf(LogDEBUG, "IPv6 available: %s\n",
76 probe.ipv6_available ? "yes" : "no");
77 #endif
78 }
79