1 files changed, 155 insertions, 0 deletions
diff --git a/zebra/ipforward_proc.c b/zebra/ipforward_proc.c
new file mode 100644
index 0000000000..eb8cef01f1
--- /dev/null
+++ b/zebra/ipforward_proc.c
@@ -0,0 +1,155 @@
+/*
+ * Fetch ipforward value by reading /proc filesystem.
+ * Copyright (C) 1997 Kunihiro Ishiguro
+ *
+ * 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>
+
+char proc_net_snmp[] = "/proc/net/snmp";
+
+static void
+dropline (FILE *fp)
+{
+  int c;
+
+  while ((c = getc (fp)) != '\n')
+    ;
+}
+
+int
+ipforward ()
+{
+  FILE *fp;
+  int ipforwarding = 0;
+  char *pnt;
+  char buf[10];
+
+  fp = fopen (proc_net_snmp, "r");
+
+  if (fp == NULL)
+    return -1;
+
+  /* We don't care about the first line. */
+  dropline (fp);
+  
+  /* Get ip_statistics.IpForwarding : 
+     1 => ip forwarding enabled 
+     2 => ip forwarding off. */
+  pnt = fgets (buf, 6, fp);
+  sscanf (buf, "Ip: %d", &ipforwarding);
+
+  if (ipforwarding == 1)
+    return 1;
+
+  return 0;
+}
+
+/* char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/conf/all/forwarding"; */
+char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/ip_forward";
+
+int
+ipforward_on ()
+{
+  FILE *fp;
+
+  fp = fopen (proc_ipv4_forwarding, "w");
+  
+  if (fp == NULL)
+    return -1;
+
+  fprintf (fp, "1\n");
+
+  fclose (fp);
+
+  return ipforward ();
+}
+
+int
+ipforward_off ()
+{
+  FILE *fp;
+
+  fp = fopen (proc_ipv4_forwarding, "w");
+  
+  if (fp == NULL)
+    return -1;
+
+  fprintf (fp, "0\n");
+
+  fclose (fp);
+
+  return ipforward ();
+}
+#ifdef HAVE_IPV6
+
+char proc_ipv6_forwarding[] = "/proc/sys/net/ipv6/conf/all/forwarding";
+
+int
+ipforward_ipv6 ()
+{
+  FILE *fp;
+  char buf[5];
+  int ipforwarding = 0;
+
+  fp = fopen (proc_ipv6_forwarding, "r");
+
+  if (fp == NULL)
+    return -1;
+
+  fgets (buf, 2, fp);
+  sscanf (buf, "%d", &ipforwarding);
+
+  return ipforwarding;
+}
+
+int
+ipforward_ipv6_on ()
+{
+  FILE *fp;
+
+  fp = fopen (proc_ipv6_forwarding, "w");
+  
+  if (fp == NULL)
+    return -1;
+
+  fprintf (fp, "1\n");
+
+  fclose (fp);
+
+  return ipforward_ipv6 ();
+}
+
+int
+ipforward_ipv6_off ()
+{
+  FILE *fp;
+
+  fp = fopen (proc_ipv6_forwarding, "w");
+  
+  if (fp == NULL)
+    return -1;
+
+  fprintf (fp, "0\n");
+
+  fclose (fp);
+
+  return ipforward_ipv6 ();
+}
+#endif /* HAVE_IPV6 */