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/* Interface link state tracking
* Copyright (C) 2008 Stephen Hemminger
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "log.h"
#include "privs.h"
#include "log.h"
#include "privs.h"
#include "prefix.h"
#include "zebra/interface.h"
extern struct zebra_privs_t zserv_privs;
static int
linkdetect (const char *name, int onoff)
{
FILE *fp;
int save_errno;
char proc_name[128];
snprintf(proc_name, sizeof(proc_name)-1,
"/proc/sys/net/ipv4/conf/%s/link_detect", name);
if ( zserv_privs.change(ZPRIVS_RAISE) )
zlog_err ("Can't raise privileges, %s", safe_strerror (errno) );
fp = fopen (proc_name, "w");
save_errno = errno;
if (!fp)
{
if ( zserv_privs.change(ZPRIVS_LOWER) )
zlog_err ("Can't lower privileges, %s", safe_strerror (errno));
zlog_info("Can't %s link-detect, %s:%s",
onoff ? "enable" : "disable",
proc_name, safe_strerror(save_errno));
return -1;
}
else
{
fprintf (fp, "%d\n", onoff);
fclose (fp);
if ( zserv_privs.change(ZPRIVS_LOWER) )
zlog_err ("Can't lower privileges, %s", safe_strerror (errno));
return onoff;
}
}
int
if_linkdetect_on (const char *name)
{
return linkdetect (name, 1);
}
int
if_linkdetect_off (const char *name)
{
return linkdetect (name, 1);
}
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