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