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/* -*- mode: c; c-file-style: "openbsd" -*- */
/*
* Copyright (c) 2013 Vincent Bernat <bernat@luffy.cx>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "lldpd.h"
#include <unistd.h>
static int
ip_forwarding_enabled(int af)
{
int fd, rc = -1;
const char *fname;
char status;
if (af == LLDPD_AF_IPV4)
fname = PROCFS_SYS_NET "ipv4/ip_forward";
else if (af == LLDPD_AF_IPV6)
fname = PROCFS_SYS_NET "ipv6/conf/all/forwarding";
else
return -1;
if ((fd = priv_open(fname)) < 0) return -1;
if (read(fd, &status, 1) == 1) rc = (status == '1');
close(fd);
return rc;
}
int
interfaces_routing_enabled(struct lldpd *cfg)
{
(void)cfg;
int rc;
rc = ip_forwarding_enabled(LLDPD_AF_IPV4);
/*
* Report being a router if IPv4 forwarding is enabled.
* In case of error also stop the execution right away.
* If IPv4 forwarding is disabled we'll check the IPv6 status.
*/
if (rc != 0) return rc;
return ip_forwarding_enabled(LLDPD_AF_IPV6);
}
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