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-rw-r--r--print-msdp.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/print-msdp.c b/print-msdp.c
new file mode 100644
index 0000000..7845116
--- /dev/null
+++ b/print-msdp.c
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+/*
+ * 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;
+
+ ndo->ndo_protocol = "msdp";
+ ND_PRINT(": ");
+ nd_print_protocol(ndo);
+ /* See if we think we're at the beginning of a compound packet */
+ type = GET_U_1(sp);
+ len = GET_BE_U_2(sp + 1);
+ if (len > 1500 || len < 3 || type == 0 || type > MSDP_TYPE_MAX)
+ goto trunc; /* not really truncated, but still not decodable */
+ while (length != 0) {
+ type = GET_U_1(sp);
+ len = GET_BE_U_2(sp + 1);
+ if (len > 1400 || ndo->ndo_vflag)
+ ND_PRINT(" [len %u]", len);
+ if (len < 3)
+ goto trunc;
+ if (length < len)
+ goto trunc;
+ sp += 3;
+ length -= 3;
+ switch (type) {
+ case 1: /* IPv4 Source-Active */
+ case 3: /* IPv4 Source-Active Response */
+ if (type == 1)
+ ND_PRINT(" SA");
+ else
+ ND_PRINT(" SA-Response");
+ ND_PRINT(" %u entries", GET_U_1(sp));
+ if ((u_int)((GET_U_1(sp) * 12) + 8) < len) {
+ ND_PRINT(" [w/data]");
+ if (ndo->ndo_vflag > 1) {
+ ND_PRINT(" ");
+ ip_print(ndo, sp +
+ GET_U_1(sp) * 12 + 8 - 3,
+ len - (GET_U_1(sp) * 12 + 8));
+ }
+ }
+ break;
+ case 2:
+ ND_PRINT(" SA-Request");
+ ND_PRINT(" for %s", GET_IPADDR_STRING(sp + 1));
+ break;
+ case 4:
+ ND_PRINT(" Keepalive");
+ if (len != 3)
+ ND_PRINT("[len=%u] ", len);
+ break;
+ case 5:
+ ND_PRINT(" Notification");
+ break;
+ default:
+ ND_PRINT(" [type=%u len=%u]", type, len);
+ break;
+ }
+ sp += (len - 3);
+ length -= (len - 3);
+ }
+ return;
+trunc:
+ nd_print_trunc(ndo);
+}