2 * Fetch ipforward value by reading /proc filesystem.
3 * Copyright (C) 1997 Kunihiro Ishiguro
5 * This file is part of GNU Zebra.
7 * GNU Zebra is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License as published by the
9 * Free Software Foundation; either version 2, or (at your option) any
12 * GNU Zebra is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with GNU Zebra; see the file COPYING. If not, write to the Free
19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
28 #include "zebra/ipforward.h"
30 extern struct zebra_privs_t zserv_privs
;
32 char proc_net_snmp
[] = "/proc/net/snmp";
39 while ((c
= getc (fp
)) != '\n')
50 fp
= fopen (proc_net_snmp
, "r");
55 /* We don't care about the first line. */
58 /* Get ip_statistics.IpForwarding :
59 1 => ip forwarding enabled
60 2 => ip forwarding off. */
61 if (fgets (buf
, 6, fp
))
62 sscanf (buf
, "Ip: %d", &ipforwarding
);
66 if (ipforwarding
== 1)
72 /* char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/conf/all/forwarding"; */
73 char proc_ipv4_forwarding
[] = "/proc/sys/net/ipv4/ip_forward";
80 if ( zserv_privs
.change(ZPRIVS_RAISE
) )
81 zlog_err ("Can't raise privileges, %s", safe_strerror (errno
) );
83 fp
= fopen (proc_ipv4_forwarding
, "w");
86 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
87 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
95 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
96 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
106 if ( zserv_privs
.change(ZPRIVS_RAISE
) )
107 zlog_err ("Can't raise privileges, %s", safe_strerror (errno
));
109 fp
= fopen (proc_ipv4_forwarding
, "w");
112 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
113 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
121 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
122 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
128 char proc_ipv6_forwarding
[] = "/proc/sys/net/ipv6/conf/all/forwarding";
131 ipforward_ipv6 (void)
135 int ipforwarding
= 0;
137 fp
= fopen (proc_ipv6_forwarding
, "r");
142 if (fgets (buf
, 2, fp
))
143 sscanf (buf
, "%d", &ipforwarding
);
150 ipforward_ipv6_on (void)
154 if ( zserv_privs
.change(ZPRIVS_RAISE
) )
155 zlog_err ("Can't raise privileges, %s", safe_strerror (errno
));
157 fp
= fopen (proc_ipv6_forwarding
, "w");
160 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
161 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
169 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
170 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
172 return ipforward_ipv6 ();
176 ipforward_ipv6_off (void)
180 if ( zserv_privs
.change(ZPRIVS_RAISE
) )
181 zlog_err ("Can't raise privileges, %s", safe_strerror (errno
));
183 fp
= fopen (proc_ipv6_forwarding
, "w");
186 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
187 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
195 if ( zserv_privs
.change(ZPRIVS_LOWER
) )
196 zlog_err ("Can't lower privileges, %s", safe_strerror (errno
));
198 return ipforward_ipv6 ();
200 #endif /* HAVE_IPV6 */