1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 1998 Brian Somers <[email protected]>
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 * $FreeBSD$
29 */
30
31 #include <sys/time.h>
32 #include <sys/socket.h>
33
34 #include <stdio.h>
35 #include <unistd.h>
36
37 #include "probe.h"
38 #include "log.h"
39 #include "id.h"
40
41 struct probe probe;
42
43 /* Does select() alter the passed time value ? */
44 static int
select_changes_time(void)45 select_changes_time(void)
46 {
47 struct timeval t;
48
49 t.tv_sec = 0;
50 t.tv_usec = 100000;
51 select(0, NULL, NULL, NULL, &t);
52 return t.tv_usec != 100000;
53 }
54
55 #ifndef NOINET6
56 static int
ipv6_available(void)57 ipv6_available(void)
58 {
59 int s;
60
61 if ((s = ID0socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
62 return 0;
63
64 close(s);
65 return 1;
66 }
67 #endif
68
69 void
probe_Init()70 probe_Init()
71 {
72 probe.select_changes_time = select_changes_time() ? 1 : 0;
73 log_Printf(LogDEBUG, "Select changes time: %s\n",
74 probe.select_changes_time ? "yes" : "no");
75 #ifndef NOINET6
76 probe.ipv6_available = ipv6_available() ? 1 : 0;
77 log_Printf(LogDEBUG, "IPv6 available: %s\n",
78 probe.ipv6_available ? "yes" : "no");
79 #endif
80 }
81