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