137142Sbrian/*-
237142Sbrian * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org>
337142Sbrian * All rights reserved.
437142Sbrian *
537142Sbrian * Redistribution and use in source and binary forms, with or without
637142Sbrian * modification, are permitted provided that the following conditions
737142Sbrian * are met:
837142Sbrian * 1. Redistributions of source code must retain the above copyright
937142Sbrian *    notice, this list of conditions and the following disclaimer.
1037142Sbrian * 2. Redistributions in binary form must reproduce the above copyright
1137142Sbrian *    notice, this list of conditions and the following disclaimer in the
1237142Sbrian *    documentation and/or other materials provided with the distribution.
1337142Sbrian *
1437142Sbrian * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
1537142Sbrian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1637142Sbrian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1737142Sbrian * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
1837142Sbrian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1937142Sbrian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2037142Sbrian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2137142Sbrian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2237142Sbrian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2337142Sbrian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2437142Sbrian * SUCH DAMAGE.
2537142Sbrian *
2650479Speter * $FreeBSD$
2737142Sbrian */
2837142Sbrian
2937142Sbrian#include <sys/time.h>
3081697Sbrian#include <sys/socket.h>
3181697Sbrian
3281785Sbrian#include <stdio.h>
3337142Sbrian#include <unistd.h>
3437142Sbrian
3537142Sbrian#include "probe.h"
3637142Sbrian#include "log.h"
3781785Sbrian#include "id.h"
3837142Sbrian
3981697Sbrianstruct probe probe;
4081697Sbrian
4137142Sbrian/* Does select() alter the passed time value ? */
4237142Sbrianstatic int
4337142Sbrianselect_changes_time(void)
4437142Sbrian{
4537142Sbrian  struct timeval t;
4637142Sbrian
4737142Sbrian  t.tv_sec = 0;
4837142Sbrian  t.tv_usec = 100000;
4937142Sbrian  select(0, NULL, NULL, NULL, &t);
5037142Sbrian  return t.tv_usec != 100000;
5137142Sbrian}
5237142Sbrian
5381697Sbrian#ifndef NOINET6
5481697Sbrianstatic int
5581697Sbrianipv6_available(void)
5681697Sbrian{
5781697Sbrian  int s;
5881697Sbrian
5989422Sbrian  if ((s = ID0socket(PF_INET6, SOCK_DGRAM, 0)) == -1)
6081697Sbrian    return 0;
6181697Sbrian
6281697Sbrian  close(s);
6381697Sbrian  return 1;
6481697Sbrian}
6581697Sbrian#endif
6681697Sbrian
6737142Sbrianvoid
6881697Sbrianprobe_Init()
6937142Sbrian{
7081697Sbrian  probe.select_changes_time = select_changes_time() ? 1 : 0;
7137142Sbrian  log_Printf(LogDEBUG, "Select changes time: %s\n",
7281697Sbrian             probe.select_changes_time ? "yes" : "no");
7381697Sbrian#ifndef NOINET6
7481697Sbrian  probe.ipv6_available = ipv6_available() ? 1 : 0;
7581697Sbrian  log_Printf(LogDEBUG, "IPv6 available: %s\n",
7681697Sbrian             probe.ipv6_available ? "yes" : "no");
7781697Sbrian#endif
7837142Sbrian}
79