Wireshark-dev: [Wireshark-dev] new dissector / redback lawful intercept packet
From: Florian Lohoff <[email protected]>
Date: Wed, 27 Feb 2008 11:00:57 +0100
Hi,
here a new dissector for the RedBack Smartedge Lawful Intercept packet format.

Flo
-- 
Florian Lohoff                  [email protected]             +49-171-2280134
	Those who would give up a little freedom to get a little 
          security shall soon have neither - Benjamin Franklin
Index: epan/dissectors/Makefile.common
===================================================================
--- epan/dissectors/Makefile.common	(revision 24458)
+++ epan/dissectors/Makefile.common	(working copy)
@@ -626,6 +626,7 @@
 	packet-rdm.c		\
 	packet-rdt.c		\
 	packet-redback.c 	\
+	packet-redbackli.c 	\
 	packet-retix-bpdu.c 	\
 	packet-rgmp.c		\
 	packet-rip.c		\
Index: epan/dissectors/packet-redbackli.c
===================================================================
--- epan/dissectors/packet-redbackli.c	(revision 0)
+++ epan/dissectors/packet-redbackli.c	(revision 0)
@@ -0,0 +1,222 @@
+/* packet-redbackli.c
+ *
+ * Redback Lawful Intercept Packet dissector
+ *
+ * Copyright 2008 Florian Lohoff <[email protected]>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <time.h>
+#include <string.h>
+
+#include <glib.h>
+#include <epan/packet.h>
+#include <epan/addr_resolv.h>
+#include <epan/prefs.h>
+#include <epan/strutil.h>
+
+#define UDP_PORT_RBLI 4000
+
+void proto_reg_handoff_redbackli(void);
+static int proto_redbackli = -1;
+
+static int hf_redbackli_seqno = -1;		/* Sequence No */
+static int hf_redbackli_liid = -1;		/* LI Id */
+static int hf_redbackli_sessid = -1;		/* Session Id */
+static int hf_redbackli_label = -1;		/* Label */
+static int hf_redbackli_eohpad = -1;		/* End Of Header Padding */
+static int hf_redbackli_unknownavp = -1;	/* Unknown AVP */
+
+static int ett_redbackli = -1;
+
+static guint global_udp_port_redbackli = UDP_PORT_RBLI;
+static guint udp_port_redbackli = UDP_PORT_RBLI;
+
+static dissector_handle_t ip_handle;
+
+#define RB_AVP_SEQNO	1
+#define RB_AVP_LIID	2
+#define RB_AVP_SESSID	3
+#define RB_AVP_LABEL	20
+#define RB_AVP_EOH	0
+
+static const value_string avp_names[] = {
+	{RB_AVP_SEQNO,		"Sequence No"},
+	{RB_AVP_LIID,		"Lawful Intercept Id"},
+	{RB_AVP_SESSID,		"Session Id"},
+	{RB_AVP_LABEL,		"Label"},
+	{RB_AVP_EOH,		"End Of Header"},
+	{0,			NULL},
+};
+
+static int dissect_redbackli_avp(guint8 avptype, guint8 avplen, tvbuff_t *tvb, gint offset, proto_tree *t) {
+	guint32		avpintval;
+	char		*avpcharval;
+	const char	*avpname;
+	proto_tree	*ti, *st=NULL;
+
+	avpname=val_to_str(avptype, avp_names, "Unknown");
+
+	if (t) {
+		ti = proto_tree_add_text(t, tvb, offset, avplen+2, "%s AVP", avpname);
+		st = proto_item_add_subtree(ti, ett_redbackli);
+
+		proto_tree_add_text(st, tvb, offset, 1, "AVP Type: %d", avptype);
+		proto_tree_add_text(st, tvb, offset+1, 1, "AVP Length: %d", avplen);
+	}
+
+	switch(avptype) {
+		case(RB_AVP_SEQNO):
+			avpintval=tvb_get_ntohl(tvb, offset+2);
+			if (t)
+				proto_tree_add_uint(st, hf_redbackli_seqno, tvb,
+					offset+2, avplen, avpintval);
+			break;
+		case(RB_AVP_LIID):
+			avpintval=tvb_get_ntohl(tvb, offset+2);
+			if (t)
+				proto_tree_add_uint(st, hf_redbackli_liid, tvb,
+					offset+2, avplen, avpintval);
+			break;
+		case(RB_AVP_SESSID):
+			avpintval=tvb_get_ntohl(tvb, offset+2);
+			if (t)
+				proto_tree_add_uint(st, hf_redbackli_sessid, tvb,
+					offset+2, avplen, avpintval);
+			break;
+		case(RB_AVP_LABEL):
+			avpcharval=tvb_get_string(tvb, offset+2, avplen);
+			if (t)
+				proto_tree_add_string(st, hf_redbackli_label, tvb,
+					offset+2, avplen, avpcharval);
+			break;
+		case(RB_AVP_EOH):
+			if (t && avplen)
+				proto_tree_add_item(st, hf_redbackli_eohpad, tvb,
+					offset+2, avplen, FALSE);
+			return 1;
+		default:
+			if (t && avplen)
+				proto_tree_add_item(st, hf_redbackli_unknownavp, tvb,
+					offset+2, avplen, FALSE);
+			return 0;
+
+	}
+
+	return 0;
+}
+
+static void dissect_redbackli(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
+	guint8		avptype, avplen;
+	gint		len, offset=0, eoh=0;
+	proto_tree	*ti, *redbackli_tree=NULL;
+	tvbuff_t	*next_tvb;
+
+	if(check_col(pinfo->cinfo,COL_PROTOCOL)){
+		col_add_str(pinfo->cinfo,COL_PROTOCOL,"RBLI");
+	}
+
+	if (tree) {
+		ti = proto_tree_add_item(tree, proto_redbackli,
+				tvb, 0, -1, FALSE);
+		redbackli_tree = proto_item_add_subtree(ti, ett_redbackli);
+	}
+
+	len=tvb_length(tvb);
+
+	while(!eoh && len > 2) {
+		avptype = tvb_get_guint8(tvb, offset+0);
+		avplen = tvb_get_guint8(tvb, offset+1);
+
+		if (len < avplen+2)		/* AVP Complete ? */
+			break;
+
+		eoh=dissect_redbackli_avp(avptype, avplen, tvb, offset, redbackli_tree);
+
+		offset+=2+avplen;
+		len-=2+avplen;
+	}
+
+	next_tvb = tvb_new_subset(tvb, offset, -1, -1);
+	call_dissector(ip_handle, next_tvb, pinfo, tree);
+}
+
+void proto_register_redbackli(void) {
+	static hf_register_info hf[] = {
+		{ &hf_redbackli_seqno,
+			{ "Sequence No", "redbackli.seqno", FT_UINT32, BASE_DEC, NULL, 0x0,
+			"Sequence No", HFILL }},
+		{ &hf_redbackli_liid,
+			{ "Lawful Intercept Id", "redbackli.liid", FT_UINT32, BASE_DEC, NULL, 0x0,
+			"LI Identifier", HFILL }},
+		{ &hf_redbackli_sessid,
+			{ "Session Id", "redbackli.sessid", FT_UINT32, BASE_DEC, NULL, 0x0,
+			"Session Identifier", HFILL }},
+		{ &hf_redbackli_label,
+			{ "Label", "redbackli.label", FT_STRING, BASE_NONE, NULL, 0x0,
+			"Label", HFILL }},
+		{ &hf_redbackli_eohpad,
+			{ "End of Header Padding", "redbackli.eohpad", FT_BYTES, BASE_HEX, NULL, 0x0,
+			"", HFILL }},
+		{ &hf_redbackli_unknownavp,
+			{ "Unknown AVP", "redbackli.unknownavp", FT_BYTES, BASE_HEX, NULL, 0x0,
+			"", HFILL }},
+		};
+
+	static gint *ett[] = {
+		&ett_redbackli,
+	};
+
+	module_t *redbackli_module;
+
+	proto_redbackli = proto_register_protocol("Redback Lawful Intercept",
+				       "RedbackLI","redbackli");
+	proto_register_field_array(proto_redbackli,hf,array_length(hf));
+	proto_register_subtree_array(ett,array_length(ett));
+
+	redbackli_module = prefs_register_protocol(proto_redbackli,
+					proto_reg_handoff_redbackli);
+	prefs_register_uint_preference(redbackli_module, "udp_port",
+				 "RedbackLI UDP Port",
+				 "The UDP port on which "
+				 "Redback Lawful Intercept "
+				 "packets will be sent",
+				 10, &global_udp_port_redbackli);
+}
+
+void proto_reg_handoff_redbackli(void) {
+	static int			redbackli_initialized = FALSE;
+	static dissector_handle_t	redbackli_handle;
+
+	ip_handle = find_dissector("ip");
+
+	if(!redbackli_initialized) {
+		redbackli_handle = create_dissector_handle(dissect_redbackli, proto_redbackli);
+		redbackli_initialized = TRUE;
+	} else {
+		dissector_delete("udp.port",udp_port_redbackli,redbackli_handle);
+	}
+
+	udp_port_redbackli = global_udp_port_redbackli;
+	dissector_add("udp.port",global_udp_port_redbackli, redbackli_handle);
+}

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