/*
 * smb.c
 *
 * Copyright (C) 2009-2011 by ipoque GmbH
 * Copyright (C) 2011-15 - ntop.org
 *
 * This file is part of nDPI, an open source deep packet inspection
 * library based on the OpenDPI and PACE technology by ipoque GmbH
 *
 * nDPI is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * nDPI 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with nDPI.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */


#include "ndpi_protocols.h"
#ifdef NDPI_PROTOCOL_SMB

static void ndpi_int_smb_add_connection(struct ndpi_detection_module_struct
										  *ndpi_struct, struct ndpi_flow_struct *flow)
{
	ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_SMB, NDPI_REAL_PROTOCOL);
}

void ndpi_search_smb_tcp(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
{  
	struct ndpi_packet_struct *packet = &flow->packet;
	
	if(packet && packet->tcp) {
	  NDPI_LOG(NDPI_PROTOCOL_SMB, ndpi_struct, NDPI_LOG_DEBUG, "search SMB.\n");
	  
	  if (packet->tcp->dest == htons(445)
	      && packet->payload_packet_len > (32 + 4 + 4)
	      && (packet->payload_packet_len - 4) == ntohl(get_u_int32_t(packet->payload, 0))
	      && get_u_int32_t(packet->payload, 4) == htonl(0xff534d42)) {
	    NDPI_LOG(NDPI_PROTOCOL_SMB, ndpi_struct, NDPI_LOG_DEBUG, "found SMB.\n");
	    ndpi_int_smb_add_connection(ndpi_struct, flow);
	    return;
	    
	  }
	}

	NDPI_LOG(NDPI_PROTOCOL_SMB, ndpi_struct, NDPI_LOG_DEBUG, "exclude SMB.\n");
	NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SMB);
}

#endif