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186 lines
2.9 KiB
C
186 lines
2.9 KiB
C
/*
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* Fetch ipforward value by reading /proc filesystem.
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* Copyright (C) 1997 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; see the file COPYING; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <zebra.h>
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#ifdef GNU_LINUX
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#include "log.h"
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#include "privs.h"
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#include "zebra/ipforward.h"
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extern struct zebra_privs_t zserv_privs;
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char proc_net_snmp[] = "/proc/net/snmp";
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static void dropline(FILE *fp)
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{
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int c;
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while ((c = getc(fp)) != '\n')
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;
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}
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int ipforward(void)
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{
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int ret = 0;
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FILE *fp;
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int ipforwarding = 0;
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char buf[10];
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fp = fopen(proc_net_snmp, "r");
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if (fp == NULL)
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return -1;
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/* We don't care about the first line. */
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dropline(fp);
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/* Get ip_statistics.IpForwarding :
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1 => ip forwarding enabled
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2 => ip forwarding off. */
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if (fgets(buf, 6, fp))
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ret = sscanf(buf, "Ip: %d", &ipforwarding);
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fclose(fp);
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if (ret == 1 && ipforwarding == 1)
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return 1;
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return 0;
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}
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/* char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/conf/all/forwarding"; */
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char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/ip_forward";
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int ipforward_on(void)
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{
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FILE *fp;
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frr_with_privs(&zserv_privs) {
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fp = fopen(proc_ipv4_forwarding, "w");
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if (fp == NULL) {
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return -1;
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}
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fprintf(fp, "1\n");
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fclose(fp);
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}
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return ipforward();
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}
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int ipforward_off(void)
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{
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FILE *fp;
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frr_with_privs(&zserv_privs) {
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fp = fopen(proc_ipv4_forwarding, "w");
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if (fp == NULL) {
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return -1;
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}
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fprintf(fp, "0\n");
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fclose(fp);
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}
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return ipforward();
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}
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char proc_ipv6_forwarding[] = "/proc/sys/net/ipv6/conf/all/forwarding";
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int ipforward_ipv6(void)
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{
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int ret = 0;
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FILE *fp;
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char buf[5];
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int ipforwarding = 0;
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fp = fopen(proc_ipv6_forwarding, "r");
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if (fp == NULL)
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return -1;
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if (fgets(buf, 2, fp))
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ret = sscanf(buf, "%d", &ipforwarding);
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fclose(fp);
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if (ret != 1)
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return 0;
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return ipforwarding;
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}
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int ipforward_ipv6_on(void)
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{
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FILE *fp;
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frr_with_privs(&zserv_privs) {
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fp = fopen(proc_ipv6_forwarding, "w");
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if (fp == NULL) {
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return -1;
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}
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fprintf(fp, "1\n");
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fclose(fp);
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}
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return ipforward_ipv6();
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}
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int ipforward_ipv6_off(void)
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{
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FILE *fp;
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frr_with_privs(&zserv_privs) {
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fp = fopen(proc_ipv6_forwarding, "w");
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if (fp == NULL) {
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return -1;
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}
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fprintf(fp, "0\n");
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fclose(fp);
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}
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return ipforward_ipv6();
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}
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#endif /* GNU_LINUX */
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