basic sdp dissector for the bluetooth stack

svn path=/trunk/; revision=18229

1 files changed, 851 insertions, 0 deletions

diff --git a/epan/dissectors/packet-btsdp.c b/epan/dissectors/packet-btsdp.c
new file mode 100644
index 0000000000..85968f10c3
--- /dev/null
+++ b/epan/dissectors/packet-btsdp.c
@@ -0,0 +1,851 @@
+/* packet-btsdp.c
+ * Routines for Bluetooth SDP dissection
+ * Copyright 2002, Wolfgang Hansmann <hansmann@cs.uni-bonn.de>
+ *
+ * Refactored for wireshark checkin
+ *   Ronnie Sahlberg 2006
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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 <glib.h>
+
+#include <epan/packet.h>
+#include <epan/value_string.h>
+#include <epan/emem.h>
+#include <etypes.h>
+#include "packet-btl2cap.h"
+
+/* Initialize the protocol and registered fields */
+static int proto_btsdp = -1;
+static int hf_pduid = -1;
+static int hf_tid = -1;
+static int hf_plen = -1;
+static int hf_ssr_total_count = -1;
+static int hf_ssr_current_count = -1;
+static int hf_error_code = -1;
+static int hf_ssares_al_bytecount = -1;
+
+
+/* Initialize the subtree pointers */
+static gint ett_btsdp = -1;
+static gint ett_btsdp_ssr = -1;
+static gint ett_btsdp_des = -1;
+static gint ett_btsdp_attribute = -1;
+static gint ett_btsdp_service_search_pattern = -1;
+static gint ett_btsdp_attribute_idlist = -1;
+
+static const value_string vs_pduid[] = {
+	{0x1, "SDP_ErrorResponse"},
+	{0x2, "SDP_ServiceSearchRequest"},
+	{0x3, "SDP_ServiceSearchResponse"},
+	{0x4, "SDP_ServiceAttributeRequest"},
+	{0x5, "SDP_ServiceAttributeResponse"},
+	{0x6, "SDP_ServiceSearchAttributeRequest"},
+	{0x7, "SDP_ServiceSearchAttributeResponse"},
+	{0, NULL}
+};
+
+static const value_string vs_error_code[] = {
+	{0x0001, "Invalid/unsupported SDP version"},
+	{0x0002, "Invalid Service Record Handle"},
+	{0x0003, "Invalid request syntax"},
+	{0x0004, "Invalid PDU size"},
+	{0x0005, "Invalid Continuation State"},
+	{0x0006, "Insufficient Resources to satisfy Request"},
+	{0, NULL}
+};
+
+static const value_string vs_general_attribute_id[] = {
+	{0x0000, "ServiceRecordHandle"},
+	{0x0001, "ServiceClassIDList"},
+	{0x0002, "ServiceRecordState"},
+	{0x0003, "ServiceID"},
+	{0x0004, "ProtocolDescriptorList"},
+	{0x0005, "BrowseGroupList"},
+	{0x0006, "LanguageBaseAttributeIDList"},
+	{0x0007, "ServiceinfoTimeToLive"},
+	{0x0008, "ServiceAvailability"},
+	{0x0009, "BluetoothProfileDescriptorList"},
+	{0x000a, "DocumentationURL"},
+	{0x000b, "ClientExecutableURL"},
+	{0x000c, "IconURL"},
+	{0x0100, "Service Name"},
+	{0x0101, "Service Description"},
+	{0x0102, "Service Provider"},
+	{0, NULL}
+};
+
+
+static const value_string vs_protocols[] = {
+	{0x0001, "SDP"},
+	{0x0002, "UDP"},
+	{0x0003, "RFCOMM"},
+	{0x0004, "TCP"},
+	{0x0005, "TCS-BIN"},
+	{0x0006, "TCS-AT"},
+	{0x0008, "OBEX"},
+	{0x0009, "IP"},
+	{0x000A, "FTP"},
+	{0x000C, "HTTP"},
+	{0x000E, "WSP"},
+	{0x000F, "BNEP"},
+	{0x0010, "UPNP"},
+	{0x0011, "HIDP"},
+	{0x0012, "HardcopyControlChannel"},
+	{0x0014, "HardcopyDataChannel"},
+	{0x0016, "HardcopyNotification"},
+	{0x0017, "AVCTP"},
+	{0x0019, "AVDTP"},
+	{0x001B, "CMPT"},
+	{0x001D, "UDI_C-Plane"},
+	{0x0100, "L2CAP"},
+	{0, NULL}
+};
+
+static const value_string vs_service_classes[] = {
+
+	{0x0001, "SDP"},
+	{0x0002, "UDP"},
+	{0x0003, "RFCOMM"},
+	{0x0004, "TCP"},
+	{0x0005, "TCS-BIN"},
+	{0x0006, "TCS-AT"},
+	{0x0008, "OBEX"},
+	{0x0009, "IP"},
+	{0x000A, "FTP"},
+	{0x000C, "HTTP"},
+	{0x000E, "WSP"},
+	{0x000F, "BNEP"},
+	{0x0010, "UPNP"},
+	{0x0011, "HIDP"},
+	{0x0012, "HardcopyControlChannel"},
+	{0x0014, "HardcopyDataChannel"},
+	{0x0016, "HardcopyNotification"},
+	{0x0017, "AVCTP"},
+	{0x0019, "AVDTP"},
+	{0x001B, "CMPT"},
+	{0x001D, "UDI_C-Plane"},
+	{0x0100, "L2CAP"},
+	{0x1000, "ServiceDiscoveryServerServiceClassID"},
+	{0x1001, "BrowseGroupDescriptorServiceClassID"},
+	{0x1002, "PublicBrowseGroup"},
+	{0x1101, "SerialPort"},
+	{0x1102, "LANAccessUsingPPP"},
+	{0x1103, "DialupNetworking"},
+	{0x1104, "IrMCSync"},
+	{0x1105, "OBEXObjectPush"},
+	{0x1106, "OBEXFileTransfer"},
+	{0x1107, "IrMCSyncCommand"},
+	{0x1108, "Headset"},
+	{0x1109, "CordlessTelephony"},
+	{0x110A, "AudioSource"},
+	{0x110B, "AudioSink"},
+	{0x110C, "A/V_RemoteControlTarget"},
+	{0x110D, "AdvancedAudioDistribution"},
+	{0x110E, "A/V_RemoteControl"},
+	{0x110F, "VideoConferencing"},
+	{0x1110, "Intercom"},
+	{0x1111, "Fax"},
+	{0x1112, "HeadsetAudioGateway"},
+	{0x1113, "WAP"},
+	{0x1114, "WAP_CLIENT"},
+	{0x1115, "PANU"},
+	{0x1116, "NAP"},
+	{0x1117, "GN"},
+	{0x1118, "DirectPrinting"},
+	{0x1119, "ReferencePrinting"},
+	{0x111A, "Imaging"},
+	{0x111B, "ImagingResponder"},
+	{0x111C, "ImagingAutomaticArchive"},
+	{0x111D, "ImagingReferencedObjects"},
+	{0x1115, "PANU"},
+	{0x1116, "NAP"},
+	{0x1117, "GN"},
+	{0x1118, "DirectPrinting"},
+	{0x1119, "ReferencePrinting"},
+	{0x111A, "Imaging"},
+	{0x111B, "ImagingResponder"},
+	{0x111C, "ImagingAutomaticArchive"},
+	{0x111D, "ImagingReferencedObjects"},
+	{0x111E, "Handsfree"},
+	{0x111F, "HandsfreeAudioGateway"},
+	{0x1120, "DirectPrintingReferenceObjectsService"},
+	{0x1121, "ReflectedUI"},
+	{0x1122, "BasicPrinting"},
+	{0x1123, "PrintingStatus"},
+	{0x1124, "HumanInterfaceDeviceService"},
+	{0x1125, "HardcopyCableReplacement"},
+	{0x1126, "HCR_Print"},
+	{0x1127, "HCR_Scan"},
+	{0x1128, "Common_ISDN_Access"},
+	{0x1129, "VideoConferencingGW"},
+	{0x112A, "UDI_MT"},
+	{0x112B, "UDI_TA"},
+	{0x112C, "Audio/Video"},
+	{0x112D, "SIM_Access"},
+	{0x1200, "PnPInformation"},
+	{0x1201, "GenericNetworking"},
+	{0x1202, "GenericFileTransfer"},
+	{0x1203, "GenericAudio"},
+	{0x1204, "GenericTelephony"},
+	{0x1205, "UPNP_Service"},
+	{0x1206, "UPNP_IP_Service"},
+	{0x1300, "ESDP_UPNP_IP_PAN"},
+	{0x1301, "ESDP_UPNP_IP_LAP"},
+	{0x1302, "ESDP_UPNP_L2CAP"},
+	{0, NULL}
+};
+
+
+
+static int 
+get_type_length(tvbuff_t *tvb, int offset, int *length)
+{
+	int size = 0;
+	guint8 byte0 = tvb_get_guint8(tvb, offset);
+	offset++;
+	
+	switch (byte0 & 0x07) {
+	case 0:
+		size = (byte0 >> 3) == 0 ? 0 : 1;
+		break;
+	case 1:
+		size = 2;
+		break;
+	case 2:
+		size = 4;
+		break;
+	case 3:		
+		size = 8;
+		break;
+	case 4:
+		size = 16;
+		break;
+	case 5:
+		size = tvb_get_guint8(tvb, offset);
+		offset++;
+		break;
+	case 6:
+		size = tvb_get_ntohs(tvb, offset);
+		offset += 2;
+		break;
+	case 7:
+		size = tvb_get_ntohl(tvb, offset);
+		offset += 4;
+		break;		
+	}
+
+	*length = size;
+	return offset;
+}
+
+
+static guint32 
+get_uint_by_size(tvbuff_t *tvb, int off, int size) 
+{
+	switch(size) {
+	case 0:
+		return tvb_get_guint8(tvb, off);
+	case 1:
+		return tvb_get_ntohs(tvb, off);
+	case 2:
+		return tvb_get_ntohl(tvb, off);
+	default:
+		return 0xffffffff;
+	}
+}
+
+
+static gint32 
+get_int_by_size(tvbuff_t *tvb, int off, int size) 
+{
+	switch(size) {
+	case 0:
+		return tvb_get_guint8(tvb, off);
+	case 1:
+		return tvb_get_ntohs(tvb, off);
+	case 2:
+		return tvb_get_ntohl(tvb, off);
+	default:
+		return -1;
+	}
+}
+
+
+static int 
+dissect_attribute_id_list(proto_tree *t, tvbuff_t *tvb, int offset)
+{
+	proto_item *ti;
+	proto_tree *st;
+	int start_offset, bytes_to_go;
+
+	start_offset=offset;
+	ti = proto_tree_add_text(t, tvb, offset, 2, "AttributeIDList");
+	st = proto_item_add_subtree(ti, ett_btsdp_attribute_idlist);
+
+	offset = get_type_length(tvb, offset, &bytes_to_go);
+	proto_item_set_len(ti, offset - start_offset + bytes_to_go);
+
+	while(bytes_to_go>0){
+		guint8 byte0 = tvb_get_guint8(tvb, offset);
+
+		if (byte0 == 0x09) { /* 16 bit attribute id */
+
+			proto_tree_add_text(st, tvb, offset, 3, "0x%04x", 
+					    tvb_get_ntohs(tvb, offset + 1));
+			offset+=3;
+			bytes_to_go-=3;
+		} else if (byte0 == 0x0a) { /* 32 bit attribute range */
+
+			proto_tree_add_text(st, tvb, offset, 5, "0x%04x - 0x%04x", 
+					    tvb_get_ntohs(tvb, offset + 1),
+					    tvb_get_ntohs(tvb, offset + 3));
+			offset+=5;
+			bytes_to_go-=5;
+		}
+	}
+	return offset - start_offset;
+}
+
+
+static int
+dissect_sdp_error_response(proto_tree *t, tvbuff_t *tvb, int offset) {
+	
+        proto_tree_add_item(t, hf_error_code, tvb, offset, 2, FALSE);
+	offset+=2;
+
+	return offset;
+}
+
+
+static int
+dissect_sdp_type(proto_tree *t, tvbuff_t *tvb, int offset, char **attr_val)
+{
+#define MAX_SDP_LEN 1024
+	int strpos=0, size, start_offset, type_size;
+	char *str;
+	guint8 byte0;
+	guint8 type;
+	guint8 size_index;
+
+
+	str=ep_alloc(MAX_SDP_LEN+1);
+	*attr_val=str;
+	str[0]=0;
+
+	byte0=tvb_get_guint8(tvb, offset);
+	type=(byte0>>3)&0x1f;
+	size_index=byte0&0x07;
+
+	start_offset=offset;
+	offset = get_type_length(tvb, offset, &size);
+	type_size = offset - start_offset + size;
+
+
+	switch (type) {
+	case 0:
+		proto_tree_add_text(t, tvb, start_offset, type_size, "Nil ");
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "Nil ");
+		}
+		break;
+	case 1: {
+		guint32 val = get_uint_by_size(tvb, offset, size_index);
+		proto_tree_add_text(t, tvb, start_offset, type_size, 
+				    "unsigned int %d ", val);
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "%u ", val);
+		}
+		break;
+	}
+	case 2: {
+		guint32 val = get_int_by_size(tvb, offset, size_index);
+		proto_tree_add_text(t, tvb, start_offset, type_size, 
+				    "signed int %d ", val);
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "%d ", val);
+		}
+		break;
+	}
+	case 3: {
+		char *ptr = tvb_bytes_to_str(tvb, offset, size);
+
+		if(size == 2){
+
+			guint16 id = tvb_get_ntohs(tvb, offset);	
+			const char *uuid_name = val_to_str(id, vs_service_classes, "Unknown");
+
+			proto_tree_add_text(t, tvb, start_offset, type_size,
+					    "%s(0x%s) ", uuid_name, ptr);
+			if(strpos<MAX_SDP_LEN){
+				strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "UUID:%s (0x%s) ", uuid_name, ptr);
+			}
+		} else {
+
+			proto_tree_add_text(t, tvb, start_offset, type_size, 
+					    "UUID 0x%s ", ptr);
+			if(strpos<MAX_SDP_LEN){
+				strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "0x%s ", ptr);
+			}
+		}
+		break;
+	}
+	case 8:	/* fall through */
+	case 4: {
+		char *ptr = tvb_get_ephemeral_string(tvb, offset, size);
+		
+		proto_tree_add_text(t, tvb, start_offset, type_size, "%s \"%s\"", 
+				    type == 8 ? "URL" : "String", ptr);
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "%s ", ptr);
+		}
+		break;
+	}
+	case 5: {
+		guint8 var = tvb_get_guint8(tvb, offset);
+
+		proto_tree_add_text(t, tvb, start_offset, type_size, "%s", 
+				    var ? "true" : "false");
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "%s ", var?"true":"false");
+		}
+		break;
+	}
+	case 6: /* Data Element sequence */
+	case 7: /* Data Element alternative */ {
+		proto_tree *st;
+		proto_item *ti;
+		int bytes_to_go = size;
+		int first = 1;
+		char *substr;
+
+		ti = proto_tree_add_text(t, tvb, start_offset, type_size, "%s", 
+					 type == 6 ? "Data Element sequence" : 
+					 "Data Element alternative");
+		st = proto_item_add_subtree(ti, ett_btsdp_des);
+
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "{ ");
+		}
+
+		while(bytes_to_go > 0){
+			if(!first){
+				if(strpos<MAX_SDP_LEN){
+					strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, ", ");
+				}
+			} else {
+				first = 0;
+			}
+
+			size = dissect_sdp_type(st, tvb, offset, &substr);
+			if(strpos<MAX_SDP_LEN){
+				strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "%s ", substr);
+			}
+			offset += size;
+			bytes_to_go -= size;
+		}
+
+		if(strpos<MAX_SDP_LEN){
+			strpos+=g_snprintf(str+strpos, MAX_SDP_LEN-strpos, "} ");
+		}
+		break;
+	}
+	}
+
+	/* make sure the string is 0 terminated */
+	str[MAX_SDP_LEN]=0;
+
+	return type_size;
+}
+
+
+
+
+static int 
+dissect_sdp_service_attribute(proto_tree *tree, tvbuff_t *tvb, int offset)
+{
+
+	proto_tree *st, *ti_sa, *ti_av;
+	int size;
+	const char *att_name;
+	guint16 id;
+	char *attr_val;
+
+	id = tvb_get_ntohs(tvb, offset+1);
+	att_name = val_to_str(id, vs_general_attribute_id, "Unknown");
+	
+	ti_sa = proto_tree_add_text(tree, tvb, offset, -1, 
+				    "Service Attribute: id = %s (0x%x)", att_name, id);
+	st = proto_item_add_subtree(ti_sa, ett_btsdp_attribute);
+	
+
+	proto_tree_add_text(st, tvb, offset, 3, "Attribute ID: %s (0x%x)", att_name, id);
+	ti_av = proto_tree_add_text(st, tvb, offset + 3, -1, "Attribute Value");
+	st = proto_item_add_subtree(ti_av, ett_btsdp_attribute);
+
+
+	size = dissect_sdp_type(st, tvb, offset + 3, &attr_val);
+	proto_item_append_text(ti_sa, ", value = %s", attr_val);
+
+
+	proto_item_set_len(ti_sa, size + 3);
+	proto_item_set_len(ti_av, size);
+
+	return offset+size+3;
+}
+
+
+static int 
+dissect_sdp_service_attribute_list(proto_tree *tree, tvbuff_t *tvb, int offset)
+{
+	proto_item *ti;
+	proto_tree *st;
+	int start_offset = offset, len;
+
+	offset = get_type_length(tvb, offset, &len);
+
+	ti = proto_tree_add_text(tree, tvb, start_offset, -1, "AttributeList");
+	st = proto_item_add_subtree(ti, ett_btsdp_attribute);
+
+	if(!len){
+		return offset;
+	}
+
+	while (offset - start_offset < len) {
+		offset = dissect_sdp_service_attribute(st, tvb, offset);
+	}
+
+	proto_item_set_len(ti, offset - start_offset);
+	return offset;
+}
+
+
+
+static int 
+dissect_sdp_service_attribute_list_array(proto_tree *tree, tvbuff_t *tvb, int offset)
+{
+	proto_item *ti;
+	proto_tree *st;
+	int start_offset, len;
+	
+	start_offset=offset;
+	offset = get_type_length(tvb, offset, &len);
+	ti = proto_tree_add_text(tree, tvb, start_offset, offset-start_offset+len, "AttributeLists");
+	st = proto_item_add_subtree(ti, ett_btsdp_attribute);
+
+	start_offset=offset;
+	while(offset-start_offset < len) {
+		offset = dissect_sdp_service_attribute_list(st, tvb, offset);
+	}
+
+	return offset;
+}
+
+
+
+static int
+dissect_sdp_service_search_attribute_response(proto_tree *tree, tvbuff_t *tvb, int offset) 
+{
+
+	proto_tree_add_item(tree, hf_ssares_al_bytecount, tvb, offset, 2, FALSE);
+	offset += 2;
+
+	offset += dissect_sdp_service_attribute_list_array(tree, tvb, offset);
+
+	return offset;
+}
+
+
+static int
+dissect_sdp_service_search_attribute_request(proto_tree *t, tvbuff_t *tvb, int offset)
+{
+	proto_tree *st;
+	proto_item *ti;
+	int start_offset;
+	int size, bytes_to_go;
+	char *str;
+
+	start_offset = offset;
+	ti = proto_tree_add_text(t, tvb, offset, 2, "ServiceSearchPattern");
+	st = proto_item_add_subtree(ti, ett_btsdp_attribute);
+
+	offset = get_type_length(tvb, offset, &bytes_to_go);
+	proto_item_set_len(ti, offset - start_offset + bytes_to_go);
+
+
+	while(bytes_to_go>0) {
+		size = dissect_sdp_type(st, tvb, offset, &str);
+		proto_item_append_text(st, " %s", str);
+		offset+=size;
+		bytes_to_go-=size;
+	}
+
+	/* dissect maximum attribute byte count */
+	proto_tree_add_text(t, tvb, offset, 2, "MaximumAttributeByteCount: %d", tvb_get_ntohs(tvb, offset));
+	offset+=2;
+
+
+	offset += dissect_attribute_id_list(t, tvb, offset);
+
+	proto_tree_add_text(t, tvb, offset, -1, "ContinuationState");
+
+	return offset;
+}
+
+static int 
+dissect_sdp_service_attribute_response(proto_tree *t, tvbuff_t *tvb, int offset)
+{
+	proto_tree_add_text(t, tvb, offset, 2, "AttributeListByteCount: %d",
+			    tvb_get_ntohs(tvb, offset));
+	offset+=2;
+	
+	offset = dissect_sdp_service_attribute_list(t, tvb, offset);
+
+	proto_tree_add_text(t, tvb, offset, -1, "ContinuationState");
+	offset+=tvb_length_remaining(tvb, offset);
+
+	return offset;
+}
+
+
+static int 
+dissect_sdp_service_attribute_request(proto_tree *t, tvbuff_t *tvb, int offset)
+{
+	proto_tree_add_text(t, tvb, offset, 4, "ServiceRecordHandle: 0x%x", 
+			    tvb_get_ntohl(tvb, offset));
+	offset+=4;
+
+	proto_tree_add_text(t, tvb, offset, 2, "MaximumAttributeByteCount: %d", 
+			    tvb_get_ntohs(tvb, offset));
+	offset+=2;
+
+	offset += dissect_attribute_id_list(t, tvb, offset);
+
+	proto_tree_add_text(t, tvb, offset, -1, "ContinuationState");
+	offset+=tvb_length_remaining(tvb, offset);
+	return offset;
+}
+
+
+static int 
+dissect_sdp_service_search_request(proto_tree *t, tvbuff_t *tvb, int offset)
+{
+        int start_offset, bytes_to_go, size;
+	proto_item *ti;
+	proto_tree *st;
+  
+	start_offset=offset;
+        ti = proto_tree_add_text(t, tvb, offset, 2, "ServiceSearchPattern");
+	st = proto_item_add_subtree(ti, ett_btsdp_service_search_pattern);
+
+	offset = get_type_length(tvb, offset, &bytes_to_go);
+	proto_item_set_len(ti, offset - start_offset + bytes_to_go);
+
+	while(bytes_to_go>0){
+		char *str;
+		size = dissect_sdp_type(st, tvb, offset, &str);
+		proto_item_append_text(st, " %s", str);
+		offset+=size;
+		bytes_to_go-=size;
+	}
+
+	/* dissect maximum service record count */
+
+	proto_tree_add_text(t, tvb, offset, 2, "MaximumServiceRecordCount: %d", 
+			    tvb_get_ntohs(tvb, offset));
+	offset+=2;
+
+	proto_tree_add_text(t, tvb, offset, -1, "ContinuationState");
+	offset+=tvb_length_remaining(tvb, offset);
+	return offset;
+}
+
+
+static int 
+dissect_sdp_service_search_response(proto_tree *t, tvbuff_t *tvb, int offset)
+{
+	proto_tree *st;
+	proto_item *ti;
+	guint16 curr_count;
+	int i;
+	
+	proto_tree_add_item(t, hf_ssr_total_count, tvb, offset, 2, FALSE);
+	offset+=2;
+
+	curr_count = tvb_get_ntohs(tvb, offset);
+	proto_tree_add_item(t, hf_ssr_current_count, tvb, offset, 2, FALSE);
+	offset+=2;
+
+	ti = proto_tree_add_text(t, tvb, offset, 
+				 curr_count * 4, "ServiceRecordHandleList");
+	st = proto_item_add_subtree(ti, ett_btsdp_ssr);
+	offset+=4;
+
+	while(curr_count>0){
+		proto_tree_add_text(st, tvb, offset, 4, "0x%x", tvb_get_ntohl(tvb, offset));
+		offset+=4;
+		curr_count--;
+	}
+
+	proto_tree_add_text(t, tvb, offset, -1, "ContinuationState");
+	offset+=tvb_length_remaining(tvb, offset);
+
+	return offset;
+}
+
+
+static void 
+dissect_btsdp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
+{
+	proto_item *ti;
+	proto_tree *st;
+	guint8 pdu;
+	guint16 plen;
+	const char *pdu_name;
+	int offset=0;
+
+	if (check_col(pinfo->cinfo, COL_PROTOCOL))
+		col_set_str(pinfo->cinfo, COL_PROTOCOL, "SDP");
+
+	ti = proto_tree_add_item(tree, proto_btsdp, tvb, 0, -1, FALSE);
+	st = proto_item_add_subtree(ti, ett_btsdp);
+
+	/* pdu id */
+	pdu = tvb_get_guint8(tvb, offset);
+	proto_tree_add_item(st, hf_pduid, tvb, offset, 1, FALSE);
+	pdu_name = val_to_str(pdu, vs_pduid, "Unknown");
+	if (check_col(pinfo->cinfo, COL_INFO)) {
+		col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s ",pinfo->p2p_dir==P2P_DIR_SENT?"Sent":"Rcvd", pdu_name);
+	}
+	proto_item_append_text(ti, ": %s (0x%x)", pdu_name, pdu);
+	offset++;
+
+	/* tid */
+	proto_tree_add_item(st, hf_tid, tvb, offset, 2, FALSE);
+	offset+=2;
+
+	/* plen */
+	plen = tvb_get_ntohs(tvb, offset);
+	proto_tree_add_item(st, hf_plen, tvb, offset, 2, FALSE);
+	offset+=2;
+
+	switch(pdu) {
+	case 0x1:
+		offset=dissect_sdp_error_response(st, tvb, offset);
+		break;
+	case 0x2:
+		offset=dissect_sdp_service_search_request(st, tvb, offset);
+		break;
+	case 0x3:
+		offset=dissect_sdp_service_search_response(st, tvb, offset);
+		break;
+	case 0x4:
+		offset=dissect_sdp_service_attribute_request(st, tvb, offset);
+		break;
+	case 0x5:
+		offset=dissect_sdp_service_attribute_response(st, tvb, offset);
+		break;
+	case 0x6:
+		offset=dissect_sdp_service_search_attribute_request(st, tvb, offset);
+		break;
+	case 07:
+		offset=dissect_sdp_service_search_attribute_response(st, tvb, offset);
+		break;
+	}
+}
+
+
+void 
+proto_register_btsdp(void)
+{                   
+	static hf_register_info hf[] = {
+		{&hf_pduid,
+			{"PDU", "btsdp.pdu",
+			FT_UINT8, BASE_HEX, VALS(vs_pduid), 0,          
+			"PDU type", HFILL}
+		},
+		{&hf_tid,
+			{"TransactionID", "btsdp.tid",
+			FT_UINT16, BASE_HEX, NULL, 0,          
+			"Transaction ID", HFILL}
+		},
+		{&hf_plen,
+			{"ParameterLength", "btsdp.len",
+			FT_UINT16, BASE_DEC, NULL, 0,          
+			"ParameterLength", HFILL}
+		},
+		{&hf_error_code, 
+		        {"ErrorCode", "btsdp.error_code", 
+			FT_UINT16, BASE_HEX, NULL, 0, 
+			 "Error Code", HFILL}
+		},
+		{&hf_ssr_total_count,
+		        {"TotalServiceRecordCount", "btsdp.ssr.total_count",
+			FT_UINT16, BASE_DEC, NULL, 0,
+			 "Total count of service records", HFILL}
+		},
+		{&hf_ssr_current_count,
+		        {"CurrentServiceRecordCount", "btsdp.ssr.current_count",
+			FT_UINT16, BASE_DEC, NULL, 0,
+			 "count of service records in this message", HFILL}
+		},
+		{&hf_ssares_al_bytecount,
+		        {"AttributeListsByteCount", "btsdp.ssares.byte_count",
+			FT_UINT16, BASE_DEC, NULL, 0,
+			 "count of bytes in attribute list response", HFILL}
+		}
+	};
+
+	/* Setup protocol subtree array */
+
+	static gint *ett[] = {
+		&ett_btsdp,
+		&ett_btsdp_ssr,
+		&ett_btsdp_des,
+		&ett_btsdp_attribute,
+		&ett_btsdp_service_search_pattern,
+		&ett_btsdp_attribute_idlist
+	};
+
+	proto_btsdp = proto_register_protocol("Bluetooth SDP", "BTSDP", "btsdp");
+
+	register_dissector("btsdp", dissect_btsdp, proto_btsdp);
+	
+	/* Required function calls to register the header fields and subtrees used */
+	proto_register_field_array(proto_btsdp, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+}
+
+
+void
+proto_reg_handoff_btsdp(void)
+{
+	dissector_handle_t btsdp_handle;
+
+	btsdp_handle = find_dissector("btsdp");
+	dissector_add("btl2cap.psm", BTL2CAP_PSM_SDP, btsdp_handle);
+}