1 files changed, 184 insertions, 0 deletions
diff --git a/zebra/ipforward_proc.c b/zebra/ipforward_proc.c
new file mode 100644
index 0000000..4bd160d
--- /dev/null
+++ b/zebra/ipforward_proc.c
@@ -0,0 +1,184 @@
+/*
+ * 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 this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#ifdef GNU_LINUX
+
+#include "log.h"
+#include "privs.h"
+
+#include "zebra/ipforward.h"
+
+extern struct zebra_privs_t zserv_privs;
+
+static const char proc_net_snmp[] = "/proc/net/snmp";
+
+static void dropline(FILE *fp)
+{
+	while (getc(fp) != '\n')
+		;
+}
+
+int ipforward(void)
+{
+	int ret = 0;
+	FILE *fp;
+	int ipforwarding = 0;
+	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. */
+	if (fgets(buf, 6, fp))
+		ret = sscanf(buf, "Ip: %d", &ipforwarding);
+
+	fclose(fp);
+
+	if (ret == 1 && ipforwarding == 1)
+		return 1;
+
+	return 0;
+}
+
+/* char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/conf/all/forwarding"; */
+static const char proc_ipv4_forwarding[] = "/proc/sys/net/ipv4/ip_forward";
+
+int ipforward_on(void)
+{
+	FILE *fp;
+
+	frr_with_privs(&zserv_privs) {
+
+		fp = fopen(proc_ipv4_forwarding, "w");
+
+		if (fp == NULL) {
+			return -1;
+		}
+
+		fprintf(fp, "1\n");
+
+		fclose(fp);
+
+	}
+
+	return ipforward();
+}
+
+int ipforward_off(void)
+{
+	FILE *fp;
+
+	frr_with_privs(&zserv_privs) {
+
+		fp = fopen(proc_ipv4_forwarding, "w");
+
+		if (fp == NULL) {
+			return -1;
+		}
+
+		fprintf(fp, "0\n");
+
+		fclose(fp);
+
+	}
+
+	return ipforward();
+}
+
+static const char proc_ipv6_forwarding[] =
+	"/proc/sys/net/ipv6/conf/all/forwarding";
+
+int ipforward_ipv6(void)
+{
+	int ret = 0;
+	FILE *fp;
+	char buf[5];
+	int ipforwarding = 0;
+
+	fp = fopen(proc_ipv6_forwarding, "r");
+
+	if (fp == NULL)
+		return -1;
+
+	if (fgets(buf, 2, fp))
+		ret = sscanf(buf, "%d", &ipforwarding);
+
+	fclose(fp);
+
+	if (ret != 1)
+		return 0;
+
+	return ipforwarding;
+}
+
+int ipforward_ipv6_on(void)
+{
+	FILE *fp;
+
+	frr_with_privs(&zserv_privs) {
+
+		fp = fopen(proc_ipv6_forwarding, "w");
+
+		if (fp == NULL) {
+			return -1;
+		}
+
+		fprintf(fp, "1\n");
+
+		fclose(fp);
+
+	}
+
+	return ipforward_ipv6();
+}
+
+
+int ipforward_ipv6_off(void)
+{
+	FILE *fp;
+
+	frr_with_privs(&zserv_privs) {
+
+		fp = fopen(proc_ipv6_forwarding, "w");
+
+		if (fp == NULL) {
+			return -1;
+		}
+
+		fprintf(fp, "0\n");
+
+		fclose(fp);
+
+	}
+
+	return ipforward_ipv6();
+}
+
+#endif /* GNU_LINUX */