1/*
2 * dhcpcd - DHCP client daemon
3 * Copyright (c) 2006-2012 Roy Marples <roy@marples.name>
4 * All rights reserved
5
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/param.h>
29#include <sys/socket.h>
30#include <sys/sysctl.h>
31#include <sys/utsname.h>
32#include <netinet/in.h>
33
34#include <syslog.h>
35
36#include "platform.h"
37
38#ifndef SYS_NMLN	/* OSX */
39#  define SYS_NMLN 256
40#endif
41
42static char march[SYS_NMLN];
43
44char *
45hardware_platform(void)
46{
47	int mib[2] = { CTL_HW, HW_MACHINE_ARCH };
48	size_t len = sizeof(march);
49
50	if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
51		march, &len, NULL, 0) != 0)
52		return NULL;
53	return march;
54}
55
56static int
57inet6_sysctl(int code)
58{
59	int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
60	int val;
61	size_t size;
62
63	mib[3] = code;
64	size = sizeof(val);
65	if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &val, &size, NULL, 0) == -1)
66		return -1;
67	return val;
68}
69
70int
71check_ipv6(const char *ifname)
72{
73
74	/* BSD doesn't support these values per iface, so just reutrn 1 */
75	if (ifname)
76		return 1;
77
78	if (inet6_sysctl(IPV6CTL_ACCEPT_RTADV) != 1) {
79		syslog(LOG_WARNING,
80		    "Kernel is not configured to accept IPv6 RAs");
81		return 0;
82	}
83	if (inet6_sysctl(IPV6CTL_FORWARDING) != 0) {
84		syslog(LOG_WARNING,
85		    "Kernel is configured as a router, not a host");
86		return 0;
87	}
88	return 1;
89}
90