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/* * CS417 A4 template * File: packet-mbp.c * This file cotains a simple template dissector for an application protocol  * called MBP(My bogus protocol) */#ifdef HAVE_CONFIG_H# include "config.h"#endif#include <gmodule.h>#include <epan/packet.h>#include <epan/prefs.h>/* forward reference */void proto_register_mbp();void proto_reg_handoff_mbp();void dissect_mbp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);static int proto_mbp = -1;static int global_mbp_port = 5678;static dissector_handle_t mbp_handle;/* task1: declare your packet structure and other fields here */#define MBP_START_FLAG 0x01#define MBP_END_FLAG 0x02#define MBP_PRIORITY_FLAG 0x04static int hf_mbp_startflag = -1;static int hf_mbp_endflag = -1;static int hf_mbp_priorityflag = -1;static int hf_mbp_pdu_type = -1;static gint ett_mbp = -1;static int hf_mbp_flags = -1;static int hf_mbp_sequenceno = -1;static int hf_mbp_initialip = -1;static const value_string packettypenames[] = {  { 1, "INIT" },  { 2, "Terminate" },  { 3, "Data" },  { 0, NULL }};/* end task1 */voidproto_register_mbp(void){	module_t *mbp_module;	if (proto_mbp == -1) {		proto_mbp = proto_register_protocol (			"MBP Protocol",		/* name */			"MBP",		/* short name */			"mbp"		/* abbrev */			);	}	/* task2: register your packet structure */	static hf_register_info hf[] = {	  { &hf_mbp_pdu_type,	    { "MBP PDU Type","mbp.type",FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,NULL, HFILL }	  },	  	  { &hf_mbp_flags,	    { "MBP PDU Flags", "mbp.flags", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }	  },	  { &hf_mbp_startflag,	    { "MBP PDU Start Flags", "mbp.flags.start", FT_BOOLEAN, 8, NULL, MBP_Start_FLAG, NULL, HFILL}	  },	  { &hf_mbp_endflag, 	    { "MBP PDU End Flags", "mbp.flags.end", FT_BOOLEAN, 8, NULL, MBP_END_FLAG, NULL, HFILL}	  },	  { &hf_mbp_priorityflag, 	    { "MBP PDU Priority Flags", "mbp.flags.priority", FT_BOOLEAN, 8, NULL, MBP_PRIORITY_FLAG, NULL, HFILL}	  },	  { &hf_mbp_sequenceno,	    { "MBP PDU Sequence Number", "mbp.seqn", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }	  },		  { &hf_mbp_initialip,	    { "MBP PDU Initial IP", "mbp.initialip", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL}	  },	};	/* Setup protocol subtree array */	static gint *ett[] = { &ett_mbp, };		proto_register_field_array(proto_mbp,hf,array_length(hf));	proto_register_subtree_array(ett,array_length(ett));	/* end task2 */	mbp_module	= prefs_register_protocol(proto_mbp, proto_reg_handoff_mbp);}	voidproto_reg_handoff_mbp(void){	static int Initialized=FALSE;	if (!Initialized) {		mbp_handle = create_dissector_handle(dissect_mbp, proto_mbp);		dissector_add("udp.port", global_mbp_port, mbp_handle);	}}	voiddissect_mbp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree){  if (check_col(pinfo->cinfo, COL_PROTOCOL))    col_set_str(pinfo->cinfo, COL_PROTOCOL, "MBP");  /* Clear out stuff in the info column */  if(check_col(pinfo->cinfo,COL_INFO)){    col_clear(pinfo->cinfo,COL_INFO);  }  /* task3 parsing code goes here */  if (tree) { /* we are being asked for details */    proto_item *ti = NULL;    proto_tree *mbp_tree = NULL;    gint offset = 0;     ti = proto_tree_add_item(tree, proto_mbp, tvb, 0, -1, FALSE);    mbp_tree = proto_item_add_subtree(ti, ett_mbp);        proto_tree_add_item(mbp_tree, hf_mbp_pdu_type, tvb, offset, 1, FALSE);    offset++;    proto_tree_add_item(mbp_tree, hf_mbp_flags, tvb,offset,1,FALSE);    proto_tree_add_item(mbp_tree, hf_mbp_startflag, tvb, offset, 1,FALSE);    proto_tree    offset++;    proto_tree_add_item(mbp_tree, hf_mbp_sequenceno,tvb,offset,2,FALSE);    offset = offset + 2;    proto_tree_add_item(mbp_tree, hf_mbp_initialip, tvb, offset, 4, FALSE);    offset = offset + 4;  }  /* end task3 */}