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      1 /*-
      2  * Copyright (c) 1998 Brian Somers <brian (at) 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 1.6.40.1 2010/12/21 17:10:29 kensmith Exp $
     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
     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
     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
     68 probe_Init()
     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