#include <stdio.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "tsg_stat.h"
#include "tsg_entry.h"
#include <MESA/MESA_handle_logger.h>
#include "tsg_protocol_common.h"

#define MTU_LEN 65535
#define MAC_LEN 6
#define MAC_LEN_2  ((MAC_LEN)+(MAC_LEN))
#define ETH_IP_TYPE_LEN 2
#define ETH_LEN ((MAC_LEN_2)+(ETH_IP_TYPE_LEN))

#define IPV4_TYPE   1 //ADDR_TYPE_IPV4 ==1 , 取的enum 0x0800
#define IPV6_TYPE   2 //ADDR_TYPE_IPV6 ==2 0x86dd   
#define TCP_TYPE 0x06
#define UDP_TYPE 0x11

#define IPV4_LEN                    20    //ip_len(20) 
#define IPV4_PROTOCOL_INDEX         9     //ipv4_protocol_index_len
#define IPV4_TCP_HEAD_LEN_INDEX     32    //ip_len(20) + tcp_head_len_index()
#define ETH_IPV4_IP_UPD_LEN         28    //ip_len(20) + udp_len(8) 
#define IPV4_IP_LEN_INDEX   2             //ip_len_index(2)

#define IPV6_PROTOCOL_INDEX         6    //ipv6_protocol_index(6)
#define IPV6_LEN        40
#define ETH_IPV6_LEN                40    //ipv6_len(40)
#define IPV6_TCP_OPTION_LEN_INDEX   52    //ipv6_len(40) + tcp_head_len_index(12)
#define IPV6_UDP_PALYLOAD_START_INDEX 48  //ipv6_len(40) + udp_len(8)
#define IPV6_IP_PAYLOAD_INDEX  4         //ipv6_payload_index(4)

int swap_payload2byte(char *str, int endlen)
{
	char temp;

	if(endlen<4)
	{
		return 0;
	}

	for(int i=1; i<endlen; i=i+2)
	{
		for (int j=i+2; j<endlen; j=j+2)
		{
			if(str[i] != str[j])
			{
				temp = str[i];
				str[i] = str[j];
				str[j] = temp;
				return i;
			}
		}
	}
	
	return 0;
}

int send_tamper_xxx(const struct streaminfo *a_stream, long *tamper_count)
{
	const char *p_trans_payload = NULL;
	int trans_layload_len = 0;
	char tamper_buf[MTU_LEN] = {0}; 
	int  tamper_index = 0;

	if(a_stream==NULL)
	{
		tsg_stat_flow_update(STAT_STATUS_FAIL, FLOW_STAT_TAMPER, 1);
		return -1;
	}

	*tamper_count = *tamper_count + 1;
	p_trans_payload = (char *)a_stream->ptcpdetail->pdata;
	trans_layload_len = a_stream->ptcpdetail->datalen;


	if((p_trans_payload==NULL)||(trans_layload_len<=4))
	{
		tsg_stat_flow_update(STAT_STATUS_FAIL, FLOW_STAT_TAMPER, 1);
		return -1;
	}

	memcpy(tamper_buf, p_trans_payload, trans_layload_len);
	tamper_index=swap_payload2byte(tamper_buf, trans_layload_len);
	if(tamper_index<=0)
	{
		tsg_stat_flow_update(STAT_STATUS_FAIL, FLOW_STAT_TAMPER, 1);
		return -1;
	}

	int ret=tsg_send_inject_packet(a_stream, SIO_DEFAULT, tamper_buf, trans_layload_len, a_stream->routedir);
	if(ret==-1)
	{
		tsg_stat_flow_update(STAT_STATUS_FAIL, FLOW_STAT_TAMPER, 1);
	}
	else
	{
		tsg_stat_flow_update(STAT_STATUS_SUCCESS, FLOW_STAT_TAMPER, 1);
	}
	
	return ret;
}