1 files changed, 106 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-stp.c b/contrib/tcpdump/print-stp.c
new file mode 100644
index 0000000..9281663
--- /dev/null
+++ b/contrib/tcpdump/print-stp.c
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2000 Lennert Buytenhek
+ *
+ * This software may be distributed either under the terms of the
+ * BSD-style license that accompanies tcpdump or the GNU General
+ * Public License
+ *
+ * Format and print IEEE 802.1d spanning tree protocol packets.
+ * Contributed by Lennert Buytenhek <buytenh@gnu.org>
+ */
+
+#ifndef lint
+static const char rcsid[] =
+    "@(#) $Header: /tcpdump/master/tcpdump/print-stp.c,v 1.6 2000/09/29 04:58:50 guy Exp $";
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "interface.h"
+#include "addrtoname.h"
+#include "extract.h"
+
+static void
+stp_print_bridge_id(const u_char *p)
+{
+	printf("%.2x%.2x.%.2x:%.2x:%.2x:%.2x:%.2x:%.2x",
+	       p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
+}
+
+static void
+stp_print_config_bpdu(const u_char *p, u_int length)
+{
+	printf("config ");
+	if (p[7] & 1)
+		printf("TOP_CHANGE ");
+	if (p[7] & 0x80)
+		printf("TOP_CHANGE_ACK ");
+
+	stp_print_bridge_id(p+20);
+	printf(".%.2x%.2x ", p[28], p[29]);
+
+	printf("root ");
+	stp_print_bridge_id(p+8);
+
+	printf(" pathcost %i ", (p[16] << 24) | (p[17] << 16) | (p[18] << 8) | p[19]);
+
+	printf("age %i ", p[30]);
+	printf("max %i ", p[32]);
+	printf("hello %i ", p[34]);
+	printf("fdelay %i ", p[36]);
+}
+
+static void
+stp_print_tcn_bpdu(const u_char *p, u_int length)
+{
+	printf("tcn");
+}
+
+/*
+ * Print 802.1d packets.
+ */
+void
+stp_print(const u_char *p, u_int length)
+{
+	if (length < 7)
+		goto trunc;
+
+	printf("802.1d ");
+	if (p[2] != 0x03 || p[3] || p[4] || p[5]) {
+		printf("unknown version");
+		return;
+	}
+		
+	switch (p[6])
+	{
+	case 0:
+		if (length < 10)
+			goto trunc;
+		stp_print_config_bpdu(p, length);
+		break;
+
+	case 1:
+		stp_print_tcn_bpdu(p, length);
+		break;
+
+	default:
+		printf("unknown type %i\n", p[6]);
+		break;
+	}
+
+	return;
+trunc:
+	printf("[|stp %d]", length);
+}