1 files changed, 103 insertions, 0 deletions
diff --git a/print-msdp.c b/print-msdp.c
new file mode 100644
index 000000000000..50bafb0ae090
--- /dev/null
+++ b/print-msdp.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2001 William C. Fenner.
+ *                All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that: (1) source code
+ * distributions retain the above copyright notice and this paragraph
+ * in its entirety, and (2) distributions including binary code include
+ * the above copyright notice and this paragraph in its entirety in
+ * the documentation or other materials provided with the distribution.
+ * The name of William C. Fenner may not be used to endorse or
+ * promote products derived from this software without specific prior
+ * written permission.  THIS SOFTWARE IS PROVIDED ``AS IS'' AND
+ * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT
+ * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE.
+ */
+
+/* \summary: Multicast Source Discovery Protocol (MSDP) printer */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <netdissect-stdinc.h>
+
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+#define MSDP_TYPE_MAX	7
+
+void
+msdp_print(netdissect_options *ndo, const u_char *sp, u_int length)
+{
+	unsigned int type, len;
+
+	ND_TCHECK2(*sp, 3);
+	/* See if we think we're at the beginning of a compound packet */
+	type = *sp;
+	len = EXTRACT_16BITS(sp + 1);
+	if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
+		goto trunc;	/* not really truncated, but still not decodable */
+	ND_PRINT((ndo, " msdp:"));
+	while (length > 0) {
+		ND_TCHECK2(*sp, 3);
+		type = *sp;
+		len = EXTRACT_16BITS(sp + 1);
+		if (len > 1400 || ndo->ndo_vflag)
+			ND_PRINT((ndo, " [len %u]", len));
+		if (len < 3)
+			goto trunc;
+		sp += 3;
+		length -= 3;
+		switch (type) {
+		case 1:	/* IPv4 Source-Active */
+		case 3: /* IPv4 Source-Active Response */
+			if (type == 1)
+				ND_PRINT((ndo, " SA"));
+			else
+				ND_PRINT((ndo, " SA-Response"));
+			ND_TCHECK(*sp);
+			ND_PRINT((ndo, " %u entries", *sp));
+			if ((u_int)((*sp * 12) + 8) < len) {
+				ND_PRINT((ndo, " [w/data]"));
+				if (ndo->ndo_vflag > 1) {
+					ND_PRINT((ndo, " "));
+					ip_print(ndo, sp + *sp * 12 + 8 - 3,
+					         len - (*sp * 12 + 8));
+				}
+			}
+			break;
+		case 2:
+			ND_PRINT((ndo, " SA-Request"));
+			ND_TCHECK2(*sp, 5);
+			ND_PRINT((ndo, " for %s", ipaddr_string(ndo, sp + 1)));
+			break;
+		case 4:
+			ND_PRINT((ndo, " Keepalive"));
+			if (len != 3)
+				ND_PRINT((ndo, "[len=%d] ", len));
+			break;
+		case 5:
+			ND_PRINT((ndo, " Notification"));
+			break;
+		default:
+			ND_PRINT((ndo, " [type=%d len=%d]", type, len));
+			break;
+		}
+		sp += (len - 3);
+		length -= (len - 3);
+	}
+	return;
+trunc:
+	ND_PRINT((ndo, " [|msdp]"));
+}
+
+/*
+ * Local Variables:
+ * c-style: whitesmith
+ * c-basic-offset: 8
+ * End:
+ */