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 <errno.h>
29#include <stdio.h>
30#include <stdlib.h>
31#include <string.h>
32#include <syslog.h>
33
34#include "common.h"
35#include "platform.h"
36
37static const char *mproc =
38#if defined(__alpha__)
39	"system type"
40#elif defined(__arm__)
41	"Hardware"
42#elif defined(__avr32__)
43	"cpu family"
44#elif defined(__bfin__)
45	"BOARD Name"
46#elif defined(__cris__)
47	"cpu model"
48#elif defined(__frv__)
49	"System"
50#elif defined(__i386__) || defined(__x86_64__)
51	"vendor_id"
52#elif defined(__ia64__)
53	"vendor"
54#elif defined(__hppa__)
55	"model"
56#elif defined(__m68k__)
57	"MMU"
58#elif defined(__mips__)
59	"system type"
60#elif defined(__powerpc__) || defined(__powerpc64__)
61	"machine"
62#elif defined(__s390__) || defined(__s390x__)
63	"Manufacturer"
64#elif defined(__sh__)
65	"machine"
66#elif defined(sparc) || defined(__sparc__)
67	"cpu"
68#elif defined(__vax__)
69	"cpu"
70#else
71	NULL
72#endif
73	;
74
75char *
76hardware_platform(void)
77{
78	FILE *fp;
79	char *buf, *p;
80
81	if (mproc == NULL) {
82		errno = EINVAL;
83		return NULL;
84	}
85
86	fp = fopen("/proc/cpuinfo", "r");
87	if (fp == NULL)
88		return NULL;
89
90	p = NULL;
91	while ((buf = get_line(fp))) {
92		if (strncmp(buf, mproc, strlen(mproc)) == 0) {
93			p = strchr(buf, ':');
94			if (p != NULL && ++p != NULL) {
95				while (*p == ' ')
96					p++;
97				break;
98			}
99		}
100	}
101	fclose(fp);
102
103	if (p == NULL)
104		errno = ESRCH;
105	return p;
106}
107
108static int
109check_proc_int(const char *path)
110{
111	FILE *fp;
112	char *buf;
113
114	fp = fopen(path, "r");
115	if (fp == NULL)
116		return -1;
117	buf = get_line(fp);
118	fclose(fp);
119	if (buf == NULL)
120		return -1;
121	return atoi(buf);
122}
123
124static const char *prefix = "/proc/sys/net/ipv6/conf";
125
126int
127check_ipv6(const char *ifname)
128{
129	int r;
130	char path[256];
131
132	if (ifname == NULL)
133		ifname = "all";
134
135	snprintf(path, sizeof(path), "%s/%s/accept_ra", prefix, ifname);
136	r = check_proc_int(path);
137	if (r != 1 && r != 2) {
138		syslog(LOG_WARNING,
139		    "%s: not configured to accept IPv6 RAs", ifname);
140		return 0;
141	}
142
143	if (r != 2) {
144		snprintf(path, sizeof(path), "%s/%s/forwarding",
145		    prefix, ifname);
146		if (check_proc_int(path) != 0) {
147			syslog(LOG_WARNING,
148			    "%s: configured as a router, not a host", ifname);
149			return 0;
150		}
151	}
152	return 1;
153}
154