1 files changed, 65 insertions, 0 deletions
diff --git a/src/check_next_hop.c b/src/check_next_hop.c
new file mode 100644
index 00000000..0730c43e
--- /dev/null
+++ b/src/check_next_hop.c
@@ -0,0 +1,65 @@
+#include "check_ucast_static.h"
+
+static void usage(void)
+{
+	fprintf(stderr, "Usage: check_next_hop [-4|-6] address\n");
+	exit(1);
+}
+
+static void get_prefix_1(inet_prefix *dst, char *arg, int family)
+{
+
+	memset(dst, 0, sizeof(*dst));
+	get_addr_1(dst, arg, family);
+
+}
+
+int main(int argc, char **argv)
+{
+	int family = AF_UNSPEC;
+    
+	while (--argc) {
+		char *arg = *++argv;
+		inet_prefix dst;
+
+		if (arg[0] == '-') { 
+			switch(arg[1]) {
+			case '4':
+				family = AF_INET;
+				break;
+			case '6':
+				family = AF_INET6;
+				break;
+			default:
+				usage();
+			}
+            continue;
+        }
+
+		get_prefix_1(&dst, arg, family);
+
+        /*
+         * Macros to check for Mcast are based on:
+         *
+         *    Addr          dst.data
+         * 224.1.2.2    ==> 0x030201e0
+         * ff01:0203::  ==> 0x030201ff
+         *
+         */
+        if (family == AF_INET) {
+            if (IS_MULTICAST(dst.data[0])) {
+                err("Invalid next_hop...next_hop cannot be multicast\n");
+            } 
+            if (IS_BROADCAST(dst.data[0])) {
+                err("Invalid next_hop...next_hop cannot be broadcast\n");
+            } 
+        } else if (family == AF_INET6) {
+            if (IS_IPV6_MULTICAST(dst.data[0])) {
+                err("Invalid next_hop...next_hop cannot be IPv6 multicast\n");
+            } 
+        }
+
+	}
+
+	return 0;
+}