1*86d7f5d3SJohn Marino /*-
2*86d7f5d3SJohn Marino * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
3*86d7f5d3SJohn Marino * All rights reserved.
4*86d7f5d3SJohn Marino *
5*86d7f5d3SJohn Marino * Redistribution and use in source and binary forms, with or without
6*86d7f5d3SJohn Marino * modification, are permitted provided that the following conditions
7*86d7f5d3SJohn Marino * are met:
8*86d7f5d3SJohn Marino * 1. Redistributions of source code must retain the above copyright
9*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer.
10*86d7f5d3SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
11*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer in the
12*86d7f5d3SJohn Marino * documentation and/or other materials provided with the distribution.
13*86d7f5d3SJohn Marino *
14*86d7f5d3SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15*86d7f5d3SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16*86d7f5d3SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17*86d7f5d3SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18*86d7f5d3SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19*86d7f5d3SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20*86d7f5d3SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21*86d7f5d3SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22*86d7f5d3SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23*86d7f5d3SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24*86d7f5d3SJohn Marino * SUCH DAMAGE.
25*86d7f5d3SJohn Marino *
26*86d7f5d3SJohn Marino * $FreeBSD: src/usr.sbin/ppp/probe.c,v 1.3.2.1 2002/09/01 02:12:31 brian Exp $
27*86d7f5d3SJohn Marino * $DragonFly: src/usr.sbin/ppp/probe.c,v 1.3 2005/11/24 23:42:54 swildner Exp $
28*86d7f5d3SJohn Marino */
29*86d7f5d3SJohn Marino
30*86d7f5d3SJohn Marino #include <sys/time.h>
31*86d7f5d3SJohn Marino #include <sys/socket.h>
32*86d7f5d3SJohn Marino
33*86d7f5d3SJohn Marino #include <stdio.h>
34*86d7f5d3SJohn Marino #include <unistd.h>
35*86d7f5d3SJohn Marino
36*86d7f5d3SJohn Marino #include "probe.h"
37*86d7f5d3SJohn Marino #include "log.h"
38*86d7f5d3SJohn Marino #include "id.h"
39*86d7f5d3SJohn Marino
40*86d7f5d3SJohn Marino struct probe probe;
41*86d7f5d3SJohn Marino
42*86d7f5d3SJohn Marino /* Does select() alter the passed time value ? */
43*86d7f5d3SJohn Marino static int
select_changes_time(void)44*86d7f5d3SJohn Marino select_changes_time(void)
45*86d7f5d3SJohn Marino {
46*86d7f5d3SJohn Marino struct timeval t;
47*86d7f5d3SJohn Marino
48*86d7f5d3SJohn Marino t.tv_sec = 0;
49*86d7f5d3SJohn Marino t.tv_usec = 100000;
50*86d7f5d3SJohn Marino select(0, NULL, NULL, NULL, &t);
51*86d7f5d3SJohn Marino return t.tv_usec != 100000;
52*86d7f5d3SJohn Marino }
53*86d7f5d3SJohn Marino
54*86d7f5d3SJohn Marino #ifndef NOINET6
55*86d7f5d3SJohn Marino static int
ipv6_available(void)56*86d7f5d3SJohn Marino ipv6_available(void)
57*86d7f5d3SJohn Marino {
58*86d7f5d3SJohn Marino int s;
59*86d7f5d3SJohn Marino
60*86d7f5d3SJohn Marino if ((s = ID0socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
61*86d7f5d3SJohn Marino return 0;
62*86d7f5d3SJohn Marino
63*86d7f5d3SJohn Marino close(s);
64*86d7f5d3SJohn Marino return 1;
65*86d7f5d3SJohn Marino }
66*86d7f5d3SJohn Marino #endif
67*86d7f5d3SJohn Marino
68*86d7f5d3SJohn Marino void
probe_Init(void)69*86d7f5d3SJohn Marino probe_Init(void)
70*86d7f5d3SJohn Marino {
71*86d7f5d3SJohn Marino probe.select_changes_time = select_changes_time() ? 1 : 0;
72*86d7f5d3SJohn Marino log_Printf(LogDEBUG, "Select changes time: %s\n",
73*86d7f5d3SJohn Marino probe.select_changes_time ? "yes" : "no");
74*86d7f5d3SJohn Marino #ifndef NOINET6
75*86d7f5d3SJohn Marino probe.ipv6_available = ipv6_available() ? 1 : 0;
76*86d7f5d3SJohn Marino log_Printf(LogDEBUG, "IPv6 available: %s\n",
77*86d7f5d3SJohn Marino probe.ipv6_available ? "yes" : "no");
78*86d7f5d3SJohn Marino #endif
79*86d7f5d3SJohn Marino }
80