1 /*-
2 * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: src/usr.sbin/ppp/probe.c,v 1.3.2.1 2002/09/01 02:12:31 brian Exp $
27 * $DragonFly: src/usr.sbin/ppp/probe.c,v 1.3 2005/11/24 23:42:54 swildner Exp $
28 */
29
30 #include <sys/time.h>
31 #include <sys/socket.h>
32
33 #include <stdio.h>
34 #include <unistd.h>
35
36 #include "probe.h"
37 #include "log.h"
38 #include "id.h"
39
40 struct probe probe;
41
42 /* Does select() alter the passed time value ? */
43 static int
select_changes_time(void)44 select_changes_time(void)
45 {
46 struct timeval t;
47
48 t.tv_sec = 0;
49 t.tv_usec = 100000;
50 select(0, NULL, NULL, NULL, &t);
51 return t.tv_usec != 100000;
52 }
53
54 #ifndef NOINET6
55 static int
ipv6_available(void)56 ipv6_available(void)
57 {
58 int s;
59
60 if ((s = ID0socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
61 return 0;
62
63 close(s);
64 return 1;
65 }
66 #endif
67
68 void
probe_Init(void)69 probe_Init(void)
70 {
71 probe.select_changes_time = select_changes_time() ? 1 : 0;
72 log_Printf(LogDEBUG, "Select changes time: %s\n",
73 probe.select_changes_time ? "yes" : "no");
74 #ifndef NOINET6
75 probe.ipv6_available = ipv6_available() ? 1 : 0;
76 log_Printf(LogDEBUG, "IPv6 available: %s\n",
77 probe.ipv6_available ? "yes" : "no");
78 #endif
79 }
80