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-rw-r--r--print-dtp.c122
1 files changed, 122 insertions, 0 deletions
diff --git a/print-dtp.c b/print-dtp.c
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+/*
+ * Copyright (c) 1998-2007 The TCPDUMP project
+ *
+ * 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.
+ * 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.
+ *
+ * Original code by Carles Kishimoto <carles.kishimoto@gmail.com>
+ */
+
+/* \summary: Dynamic Trunking Protocol (DTP) printer */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+
+#define DTP_HEADER_LEN 1
+#define DTP_DOMAIN_TLV 0x0001
+#define DTP_STATUS_TLV 0x0002
+#define DTP_DTP_TYPE_TLV 0x0003
+#define DTP_NEIGHBOR_TLV 0x0004
+
+static const struct tok dtp_tlv_values[] = {
+ { DTP_DOMAIN_TLV, "Domain" },
+ { DTP_STATUS_TLV, "Status" },
+ { DTP_DTP_TYPE_TLV, "DTP type" },
+ { DTP_NEIGHBOR_TLV, "Neighbor" },
+ { 0, NULL}
+};
+
+void
+dtp_print(netdissect_options *ndo, const u_char *tptr, u_int length)
+{
+ ndo->ndo_protocol = "dtp";
+ if (length < DTP_HEADER_LEN) {
+ ND_PRINT("[zero packet length]");
+ goto invalid;
+ }
+
+ ND_PRINT("DTPv%u, length %u",
+ GET_U_1(tptr),
+ length);
+
+ /*
+ * In non-verbose mode, just print version.
+ */
+ if (ndo->ndo_vflag < 1) {
+ return;
+ }
+
+ tptr += DTP_HEADER_LEN;
+ length -= DTP_HEADER_LEN;
+
+ while (length) {
+ uint16_t type, len;
+
+ if (length < 4) {
+ ND_PRINT("[%u bytes remaining]", length);
+ goto invalid;
+ }
+ type = GET_BE_U_2(tptr);
+ len = GET_BE_U_2(tptr + 2);
+ /* XXX: should not be but sometimes it is, see the test captures */
+ if (type == 0)
+ return;
+ ND_PRINT("\n\t%s (0x%04x) TLV, length %u",
+ tok2str(dtp_tlv_values, "Unknown", type),
+ type, len);
+
+ /* infinite loop check */
+ if (len < 4 || len > length) {
+ ND_PRINT("[invalid TLV length %u]", len);
+ goto invalid;
+ }
+
+ switch (type) {
+ case DTP_DOMAIN_TLV:
+ ND_PRINT(", ");
+ nd_printjnp(ndo, tptr+4, len-4);
+ break;
+
+ case DTP_STATUS_TLV:
+ case DTP_DTP_TYPE_TLV:
+ if (len != 5)
+ goto invalid;
+ ND_PRINT(", 0x%x", GET_U_1(tptr + 4));
+ break;
+
+ case DTP_NEIGHBOR_TLV:
+ if (len != 10)
+ goto invalid;
+ ND_PRINT(", %s", GET_ETHERADDR_STRING(tptr+4));
+ break;
+
+ default:
+ ND_TCHECK_LEN(tptr, len);
+ break;
+ }
+ tptr += len;
+ length -= len;
+ }
+ return;
+
+ invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(tptr, length);
+}