/*- * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD: src/usr.sbin/ppp/probe.c,v 1.6.40.1 2010/12/21 17:10:29 kensmith Exp $ */ #include <sys/time.h> #include <sys/socket.h> #include <stdio.h> #include <unistd.h> #include "probe.h" #include "log.h" #include "id.h" struct probe probe; /* Does select() alter the passed time value ? */ static int select_changes_time(void) { struct timeval t; t.tv_sec = 0; t.tv_usec = 100000; select(0, NULL, NULL, NULL, &t); return t.tv_usec != 100000; } #ifndef NOINET6 static int ipv6_available(void) { int s; if ((s = ID0socket(PF_INET6, SOCK_DGRAM, 0)) == -1) return 0; close(s); return 1; } #endif void probe_Init() { probe.select_changes_time = select_changes_time() ? 1 : 0; log_Printf(LogDEBUG, "Select changes time: %s\n", probe.select_changes_time ? "yes" : "no"); #ifndef NOINET6 probe.ipv6_available = ipv6_available() ? 1 : 0; log_Printf(LogDEBUG, "IPv6 available: %s\n", probe.ipv6_available ? "yes" : "no"); #endif }