/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2013 Roy Marples <roy@marples.name>
* 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.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include "common.h"
#include "dhcpcd.h"
#include "if-options.h"
#include "platform.h"
static const char *mproc =
#if defined(__alpha__)
"system type"
#elif defined(__arm__)
"Hardware"
#elif defined(__avr32__)
"cpu family"
#elif defined(__bfin__)
"BOARD Name"
#elif defined(__cris__)
"cpu model"
#elif defined(__frv__)
"System"
#elif defined(__i386__) || defined(__x86_64__)
"vendor_id"
#elif defined(__ia64__)
"vendor"
#elif defined(__hppa__)
"model"
#elif defined(__m68k__)
"MMU"
#elif defined(__mips__)
"system type"
#elif defined(__powerpc__) || defined(__powerpc64__)
"machine"
#elif defined(__s390__) || defined(__s390x__)
"Manufacturer"
#elif defined(__sh__)
"machine"
#elif defined(sparc) || defined(__sparc__)
"cpu"
#elif defined(__vax__)
"cpu"
#else
NULL
#endif
;
#ifdef INET6
static char **restore;
static ssize_t nrestore;
#endif
char *
hardware_platform(void)
{
FILE *fp;
char *buf, *p;
if (mproc == NULL) {
errno = EINVAL;
return NULL;
}
fp = fopen("/proc/cpuinfo", "r");
if (fp == NULL)
return NULL;
p = NULL;
while ((buf = get_line(fp))) {
if (strncmp(buf, mproc, strlen(mproc)) == 0) {
p = strchr(buf, ':');
if (p != NULL && ++p != NULL) {
while (*p == ' ')
p++;
break;
}
}
}
fclose(fp);
if (p == NULL)
errno = ESRCH;
return p;
}
#ifdef INET6
static int
check_proc_int(const char *path)
{
FILE *fp;
char *buf;
fp = fopen(path, "r");
if (fp == NULL)
return -1;
buf = get_line(fp);
fclose(fp);
if (buf == NULL)
return -1;
return atoi(buf);
}
static ssize_t
write_path(const char *path, const char *val)
{
FILE *fp;
ssize_t r;
fp = fopen(path, "w");
if (fp == NULL)
return -1;
r = fprintf(fp, "%s\n", val);
fclose(fp);
return r;
}
static const char *prefix = "/proc/sys/net/ipv6/conf";
static void
restore_kernel_ra(void)
{
char path[256];
#ifndef DEBUG_MEMORY
if (options & DHCPCD_FORKED)
return;
#endif
for (nrestore--; nrestore >= 0; nrestore--) {
#ifdef DEBUG_MEMORY
if (!(options & DHCPCD_FORKED)) {
#endif
syslog(LOG_INFO, "%s: restoring Kernel IPv6 RA support",
restore[nrestore]);
snprintf(path, sizeof(path), "%s/%s/accept_ra",
prefix, restore[nrestore]);
if (write_path(path, "1") == -1 && errno != ENOENT)
syslog(LOG_ERR, "write_path: %s: %m", path);
#ifdef DEBUG_MEMORY
}
free(restore[nrestore]);
#endif
}
#ifdef DEBUG_MEMORY
free(restore);
#endif
}
int
check_ipv6(const char *ifname, int own)
{
static int ipv6_checked = 0;
int ra, ex, i;
char path[256], *p, **nrest;
if (ifname == NULL) {
if (ipv6_checked)
return 1;
ipv6_checked = 1;
ifname = "all";
ex = 1;
} else
ex = 0;
snprintf(path, sizeof(path), "%s/%s/autoconf", prefix, ifname);
i = check_proc_int(path);
if (i != 1) {
syslog(LOG_WARNING, "%s: IPv6 kernel autoconf disabled",
ifname);
return -1;
}
snprintf(path, sizeof(path), "%s/%s/accept_ra", prefix, ifname);
ra = check_proc_int(path);
if (ra == -1)
/* The sysctl probably doesn't exist, but this isn't an
* error as such so just log it and continue */
syslog(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
"%s: %m", path);
else if (ra != 0 && own) {
syslog(LOG_INFO, "%s: disabling Kernel IPv6 RA support",
ifname);
if (write_path(path, "0") == -1) {
syslog(LOG_ERR, "write_path: %s: %m", path);
return ra;
}
for (i = 0; i < nrestore; i++)
if (strcmp(restore[i], ifname) == 0)
break;
if (i == nrestore) {
p = strdup(ifname);
if (p == NULL) {
syslog(LOG_ERR, "%s: %m", __func__);
return ra;
}
nrest = realloc(restore,
(nrestore + 1) * sizeof(char *));
if (nrest == NULL) {
syslog(LOG_ERR, "%s: %m", __func__);
return ra;
}
restore = nrest;
restore[nrestore++] = p;
}
if (ex)
atexit(restore_kernel_ra);
}
return ra;
}
int
ipv6_dadtransmits(const char *ifname)
{
char path[256];
int r;
if (ifname == NULL)
ifname = "default";
snprintf(path, sizeof(path), "%s/%s/dad_transmits", prefix, ifname);
r = check_proc_int(path);
return r < 0 ? 0 : r;
}
#endif
