/*
 * gquic_process.c
 *
 *  Created on: 2019年4月2日
 *      Author: root
 */
#include "gquic_process.h"
#include "quic_analysis.h"
#include "quic_callback.h"
#include <stdbool.h>
#include <stdio.h>
#include<assert.h>
#include <MESA/MESA_handle_logger.h>


#define C2S 0x01
#define S2C 0x02
#define GQUIC_HANDSHAKE_LEN	                12+1+1+4+4
#define DIVERSIFICATION_NONCE_LEN	        32

extern struct quic_param_t g_quic_param;

enum gquic_type
{
	GQUIC=1,
	UNKNOWN_QUIC_TYPE
};

enum gquic_handshake_type 
{
	QUIC_Crypto=1,
	UNKNOWN_HANDSHAKE_TYPE
};


int get_quic_tlv(char *start_pos, quic_tlv_t *tlv, int len, int type, int thread_seq)
{
	if(tlv->ptr_value==NULL && len>0)
	{
		tlv->ptr_value=(char *)dictator_malloc(thread_seq, len);
		memset(tlv->ptr_value, 0, len);
		tlv->length=len;
		tlv->type=type;
		memcpy(tlv->ptr_value, start_pos, tlv->length);
	}
	
	return 0;
}

UINT32 get_stream_id(struct streaminfo *pstream, char* quic_data, UINT8 frame_type, UINT32 *skip_len)
{
	UINT16 data_length=0;
	UINT32 stream_id=0;
	UINT8 stream_id_len=0;
	UINT8 len_data=0,len_stream=0, len_offset=0;
	
	len_stream = read_stream_len(frame_type);
	switch(len_stream)
	{
		case	1:	
			stream_id=quic_data[*skip_len];
			break;
		case	2:
			stream_id=a_pletoh16((void *)quic_data, *skip_len);
			break;
		case	3:
			stream_id=a_pletoh24((void *)quic_data, *skip_len);
			break;
		default:
			stream_id=a_pletoh32((void *)quic_data, *skip_len);
			break;
	}
	
	*skip_len+=len_stream;  // stream ID length

	if(frame_type&STREAM_D)
	{
		data_length=ntohs(a_pletoh16((void *)quic_data, *skip_len));
		*skip_len+=2;  //data length
	}
			
	len_offset=read_offset_len(frame_type);
	*skip_len+=len_offset;

	MESA_handle_runtime_log(g_quic_param.logger,
						RLOG_LV_DEBUG,
						"QUIC_FRAME",
						"stream_id: %u data length: %u offset length: %u addr: %s",
						stream_id,
						data_length,
						len_offset,
						printaddr(&pstream->addr, pstream->threadnum));

	return stream_id;
}

UINT32 get_packet_number(char* g_data_t, UINT32 offset, UINT8 pkn_len)
{
	switch(pkn_len)
	{
		case	1:
			return g_data_t[offset];
			break;
		case	2:
			return ntohs(a_pletoh16((void *)g_data_t, offset));
			break;
		case	4:
			return a_pletoh32((void *)g_data_t, offset);
			break;
		default:
			return a_pletoh48((void *)g_data_t, offset);
			break;
	}

	return 0;
}

enum GQUIC_VERSION is_gquic_protocol(struct streaminfo *pstream, char *payload, uint32_t payload_len, uint8_t *pub_flags, uint32_t *version, uint32_t *skip_len)
{
	uint32_t is_q064=0;
	uint64_t connection_id = 0;
	int connection_id_len = 0;
	enum GQUIC_VERSION quic_version=GQUIC_UNKNOWN;
	
	if(a_canRead(5, payload_len, *skip_len))
	{
		*skip_len+=1;
		strncpy((char*)&is_q064, payload+(*skip_len), 4);
		if(ntohl(is_q064)==VER_Q046)
		{
			*skip_len += 2;
			*version=(payload[*skip_len]&0x0f)*10 + (payload[*skip_len+1]&0x0f);
			*skip_len += 2;

			MESA_handle_runtime_log(g_quic_param.logger,
									RLOG_LV_DEBUG,
									"QUIC_PUB_FLAGS",
									"version: Q0%u addr: %s",
									*version,
									printaddr(&pstream->addr, pstream->threadnum));
			
			return GQUIC_Q046;
		}
		
		*skip_len-=1;
	}

	*pub_flags=payload[*skip_len]; // public flags
	*skip_len+=1;
	
	if(*pub_flags>PACKET_PUBLIC_FLAGS_MAX)
	{
		return quic_version;
	}
	
	connection_id_len=read_conn_id_len(*pub_flags);
	connection_id=(connection_id_len==0) ? 0 : (a_pntoh64((void *)payload, *skip_len));
	*skip_len+=connection_id_len; // CID length
	
	if(payload[*skip_len]==PUBLIC_FLAG_VER_FST_BYTE && *pub_flags&PUBLIC_FLAG_VER)
	{
		*skip_len += 2;
		*version=(payload[*skip_len]&0x0f)*10 + (payload[*skip_len+1]&0x0f);
		*skip_len += 2;
		quic_version=GQUIC_OTHERS;
	}

	if(*pub_flags==PUBLIC_FLAG_NONCE)
	{
		*skip_len+=32; //diversification nonce
	}
	
	UINT8 pkt_seq_len=read_seq_num_len(*pub_flags);
	UINT32 pkt_seq=get_packet_number(payload, *skip_len, pkt_seq_len);
	*skip_len+=pkt_seq_len; // skip pkt_num

	if(*pub_flags&PUBLIC_FLAG_VER)
	{
		//message authentication hash
		*skip_len+=MSG_AUTH_HASH_LEN;
			
		if(*version>0 && *version<34)
		{
			*skip_len+=1;  //private flags
		}
	}
	
	MESA_handle_runtime_log(g_quic_param.logger,
							RLOG_LV_DEBUG,
							"QUIC_IDETIFY",
							"pub_flags: 0X%02X connection_id: %llu version: Q%03u packet number: %u dir(1: C2S;2: S2C): %d addr: %s",
							*pub_flags,
							connection_id,
							*version,
							pkt_seq,
							pstream->curdir,
							printaddr(&pstream->addr, pstream->threadnum));

	return quic_version;
}

void gquic_proc_tag(struct streaminfo *pstream, struct quic_stream *a_quic_stream, UINT16 tag_num, UINT8 direction, void* a_packet, char * quic_data, UINT32 quic_data_len, UINT32 *used_len)
{
	UCHAR return_val;
	UINT32 tag_type;
	UINT32 total_tag_len=0, tag_len=0;
	UINT32 tag_value_start=tag_num*4*2+(*used_len);  // skip length of type and offset, type(offset)=szieof(int) 
	UINT32 tag_offset_end=0, pre_tag_offset_end=0;
	int tag_type_len=4, tag_offset_len=4,num=0;
	enum quic_interested_region region_mask=QUIC_INTEREST_KEY_MASK;

	while(tag_num > 0 && a_canRead(tag_type_len+tag_offset_len, quic_data_len, *used_len))
	{
		tag_type=a_pntoh32(quic_data, *used_len);
		*used_len+=4;
		
		tag_offset_end=a_pletoh32(quic_data, *used_len);
		*used_len+=4;
		
		tag_len=tag_offset_end-pre_tag_offset_end;
		if(tag_len<0 || (tag_offset_end>=quic_data_len) || (tag_len>quic_data_len-tag_value_start))
		{
			return ;
		}

		switch(tag_type)
		{
			case	TAG_PAD:
				break;
			case	TAG_CCS:  //common_cert
				region_mask=QUIC_COMM_CERT_MASK;
				get_quic_tlv(quic_data+tag_value_start, &a_quic_stream->common_cert, tag_len, tag_type, pstream->threadnum);
				break;
			case	TAG_CCRT:  //cached_cert
				region_mask=QUIC_CACHED_CERT_MASK;
				get_quic_tlv(quic_data+tag_value_start, &a_quic_stream->cached_cert, tag_len, tag_type, pstream->threadnum);
				break;
			case	TAG_CRT:  //cert_chain ????? length need change
				if(a_quic_stream->cert_chain.length==0)
				{
					//tag_value_start += a_quic_stream->cert_chain.length;
					tag_len=(tag_len>(quic_data_len-tag_value_start+1) ? (quic_data_len-tag_value_start+1) : tag_len);
					get_quic_tlv(quic_data+tag_value_start, &a_quic_stream->cached_cert, tag_len, tag_type, pstream->threadnum);
					region_mask=QUIC_CERT_CHAIN_MASK;
				}
				break;
			case	TAG_SNI:
				if(a_quic_stream->st_client_hello.server_name_len==0)
				{
					a_quic_stream->st_client_hello.server_name_len=(tag_len>SERVER_NAME_LEN ? SERVER_NAME_LEN : tag_len);
					memcpy(a_quic_stream->st_client_hello.server_name, quic_data + tag_value_start, tag_len);
					MESA_handle_runtime_log(g_quic_param.logger,
											RLOG_LV_DEBUG,
											"QUIC_SNI",
											"SNI: %s addr: %s",
											a_quic_stream->st_client_hello.server_name,
											printaddr(&pstream->addr, pstream->threadnum));
					
				}
				break;
			case	TAG_UAID:
				if(a_quic_stream->st_client_hello.user_agent_len==0)
				{
					a_quic_stream->st_client_hello.user_agent_len=(tag_len>USER_AGENT_LEN ? USER_AGENT_LEN : tag_len);
					memcpy(a_quic_stream->st_client_hello.user_agent, quic_data + tag_value_start, a_quic_stream->st_client_hello.user_agent_len);
				}
				break;
			default:
				if(direction == 0x01 && num < a_quic_stream->st_client_hello.ext_tag_num)
				{
					a_quic_stream->st_client_hello.ext_tags[num]=(quic_tlv_t *)dictator_malloc(pstream->threadnum, sizeof(quic_tlv_t));
					get_quic_tlv(quic_data+tag_value_start, a_quic_stream->st_client_hello.ext_tags[num], (tag_len>MAX_TAG_VALUE_LEN-1 ? MAX_TAG_VALUE_LEN-1 : tag_len), tag_type, pstream->threadnum);
				}
				else if(num < a_quic_stream->st_server_hello.ext_tag_num)
				{					
					a_quic_stream->st_server_hello.ext_tags[num]=(quic_tlv_t *)dictator_malloc(pstream->threadnum, sizeof(quic_tlv_t));
					get_quic_tlv(quic_data+tag_value_start, a_quic_stream->st_server_hello.ext_tags[num], (tag_len>MAX_TAG_VALUE_LEN-1 ? MAX_TAG_VALUE_LEN-1 : tag_len), tag_type, pstream->threadnum);
				}
				num++;
				break;
		}
			
		tag_num--;
		tag_value_start+=tag_len;
		total_tag_len+=tag_len;
		pre_tag_offset_end=tag_offset_end;
		
		return_val=quic_callPlugins(a_quic_stream, pstream, region_mask, pstream->threadnum, a_packet);
		region_mask=QUIC_INTEREST_KEY_MASK;
	}
	
	*used_len += total_tag_len;
	
	return;
}

int gquic_frame_type_ack(struct quic_stream* a_quic_stream, char * quic_data, UINT32 quic_data_len, UINT8 frame_type, UINT32 *used_len)
{
	UINT8 num_timestamp, num_ranges, num_revived, num_blocks;
	UINT32 len_largest_observed=0, len_missing_packet=0;
	
	*used_len+=1;
	len_largest_observed = read_largest_observed_len(frame_type);
	len_missing_packet = read_missing_packet_len(frame_type);
	//No longer Entropy after Q034
	if(a_quic_stream->version < 34)
	{
		//Send Entropy
		*used_len += 1;
		*used_len += len_largest_observed;
		*used_len += 2;    //ack delay time
		strncpy((char*)&num_timestamp, quic_data+*used_len,1);
		*used_len += 1;
		if(num_timestamp > 0)
		{
			*used_len += 1;
			*used_len += 4;
			*used_len += (num_timestamp - 1)*(1+2);
		}
		if(frame_type & ACK_N)
		{
			strncpy((char*)&num_ranges, quic_data+*used_len,1);
			*used_len += 1;
			
			*used_len += num_ranges*(len_missing_packet+1);
			
			strncpy((char*)&num_revived, quic_data+*used_len,1);
			*used_len += 1;
			
			//Num Revived x Length Largest Observed
			*used_len += num_revived*len_largest_observed;
		}
	}
	else
	{
		*used_len += len_largest_observed;  //Largest Acked
		*used_len += 2;  //Largest Acked Delta Time
		
		if(frame_type & ACK_N) //Ack Block
		{
			strncpy((char*)&num_blocks, quic_data+*used_len,1);
			*used_len += 1;
		}
		
		*used_len += len_missing_packet; //First Ack Block Length
		if(num_blocks)
		{
			//Gap to next block
			*used_len += 1;
			num_blocks -= 1;
			*used_len += (num_blocks - 1)*len_missing_packet;
		}
		
		strncpy((char*)&num_timestamp, quic_data+*used_len,1);  //Timestamp
		*used_len += 1;
		if(num_timestamp > 0)
		{
			*used_len += 1;  //Delta Largest Acked
			*used_len += 4;  //Time Since Largest Acked
			
			//Num Timestamp x (Delta Largest Acked + Time Since Previous Timestamp)
			*used_len += (num_timestamp - 1)*(1+2);
		}
	}

	return 0;
}

// return value: Have no meaning, only numerical value
int gquic_frame_type_control(struct quic_stream* a_quic_stream, char * quic_data, UINT32 quic_data_len, UINT8 frame_type, uint32_t pkt_num_len, UINT32 *used_len)
{
	UINT16 len_reason;
	*used_len+=1;
	
	switch(frame_type)
	{
		case RST_STREAM:
			*used_len +=4; //stream id
			*used_len+=8; //Byte Offset
			*used_len+=4; //Error Code
			a_quic_stream->fin_flag=QUIC_TRUE;
			break;
		case CONNECTION_CLOSE:
			len_reason = 0;
			*used_len += 4; //Error Code
			len_reason = a_pntoh16(quic_data, *used_len);  //Reason Phrase Length
			*used_len += 2;
			//Reason Phrase,If length remaining == len_reason, it is Connection Close
			if(get_remaining_len(quic_data_len, *used_len) == len_reason)
			{
				return QUIC_DATA;
			}
			a_quic_stream->fin_flag=(a_quic_stream->fin_flag==QUIC_FALSE) ? QUIC_HALF_CLOSE : QUIC_TRUE;
			break;
		case GOAWAY:
			len_reason = 0;
			*used_len += 4;  //Error Code
			*used_len += 4; //Last Good Stream ID
			len_reason = a_pntoh16(quic_data, *used_len);  //Reason Phrase Length
			*used_len += 2;
			*used_len += len_reason; //Reason Phrase
			break;
		case WINDOW_UPDATE:
			*used_len += 4;  //Stream ID
			*used_len += 8;  //Byte Offset
			break;
		case BLOCKED:
			*used_len += 4; //Stream ID
			break;
		case STOP_WAITING:
			//No longer Entropy after Q034
			if(a_quic_stream->version < 34)
			{
				*used_len += 1; // Send Entropy
			}
			//Least Unacked Delta
			*used_len += pkt_num_len;
			break;
		case PING: //No Payload
		case PADDING:
		default:
			return QUIC_FALSE;
			break;
	}

	return QUIC_TRUE;
}

int gquic_frame_type_stream(struct streaminfo *pstream, struct quic_stream* a_quic_stream, char *quic_data, UINT32 quic_data_len, UINT8 frame_type, UINT32 *used_len, void* a_packet)
{
	UINT8 return_val;
	UINT16 tag_num = 0;
	UINT32 stream_id, message_tag;
	if(frame_type&STREAM_F)
	{
		a_quic_stream->fin_flag=QUIC_TRUE;
	}

	stream_id=get_stream_id(pstream, quic_data, frame_type, used_len);
	  
	if(stream_id==1) //handshake
	{
		message_tag = a_pntoh32((void *)quic_data, *used_len);
		*used_len += 4;
		tag_num = a_pletoh16(quic_data, *used_len);
		*used_len += 2;       //tag_num
		*used_len += 2;       //padding
		switch(message_tag)
		{
			case CHLO: //MTAG_CHLO;
				if(a_quic_stream->st_client_hello.ext_tags==NULL)
				{
					a_quic_stream->st_client_hello.ext_tags=(quic_tlv_t **)dictator_malloc(pstream->threadnum, tag_num*sizeof(quic_tlv_t*));
					a_quic_stream->st_client_hello.ext_tag_num = tag_num;
				}
				else
				{
					if(a_quic_stream->st_server_hello.ext_tag_num && tag_num>a_quic_stream->st_client_hello.ext_tag_num)
					{
						quic_release_exts(pstream->threadnum, a_quic_stream->st_client_hello.ext_tags, a_quic_stream->st_client_hello.ext_tag_num);
						a_quic_stream->st_client_hello.ext_tags=(quic_tlv_t **)dictator_malloc(pstream->threadnum, tag_num*sizeof(quic_tlv_t*));
						a_quic_stream->st_client_hello.ext_tag_num = tag_num;
					}
					else
					{
						return -1;
					}
				}
				gquic_proc_tag(pstream, a_quic_stream, tag_num, C2S, a_packet, quic_data, quic_data_len, used_len);
				if(a_quic_stream->st_client_hello.server_name_len>0 || a_quic_stream->st_client_hello.user_agent_len>0)
				{
					quic_callPlugins(a_quic_stream, pstream, QUIC_CLIENT_HELLO_MASK, pstream->threadnum, a_packet);
				}
				break;
			case SHLO:  //MTAG_SHLO;
				if(a_quic_stream->st_server_hello.ext_tags==NULL)
				{
					return -2;	
				}
				
				a_quic_stream->st_server_hello.ext_tags=(quic_tlv_t **)dictator_malloc(pstream->threadnum, tag_num*sizeof(quic_tlv_t*));
				a_quic_stream->st_server_hello.ext_tag_num=tag_num;
				
				gquic_proc_tag(pstream, a_quic_stream, tag_num, S2C, a_packet, quic_data, quic_data_len, used_len);

				if(a_quic_stream->st_server_hello.ext_tags != NULL)
				{
					quic_callPlugins(a_quic_stream, pstream, QUIC_SERVER_HELLO_MASK, pstream->threadnum, a_packet);
				}
				break;
			case REJ: //MTAG_REJ;
				if(a_quic_stream->st_server_hello.ext_tags!=NULL)
				{
					return -3;
					
				}
				
				a_quic_stream->st_server_hello.ext_tags=(quic_tlv_t **)dictator_malloc(pstream->threadnum, tag_num*sizeof(quic_tlv_t*));
				a_quic_stream->st_server_hello.ext_tag_num=tag_num;
				
				gquic_proc_tag(pstream, a_quic_stream, tag_num, S2C, a_packet, quic_data, quic_data_len, used_len);
				if(a_quic_stream->st_server_hello.ext_tags != NULL)
				{
					quic_callPlugins(a_quic_stream, pstream, QUIC_SERVER_HELLO_MASK, pstream->threadnum, a_packet);
				}
				break;
			default:
				break;
		}
	}

	return 0;
}

//frame type->stream->offset->data length
void gquic_proc_unencrypt(struct streaminfo *pstream, struct quic_stream* a_quic_stream, uint32_t pkt_num_len, void* a_packet, char * quic_data, UINT32 quic_data_len, UINT32 *used_len)
{
	UINT8 frame_type;
	UINT32 ret=0;
	
	while(*used_len<quic_data_len)
	{
		a_readUInt8(&frame_type, quic_data, quic_data_len, used_len);
		
		if(!(frame_type&FRAM_SPECIAL))
		{
			ret=gquic_frame_type_control(a_quic_stream, quic_data, quic_data_len, frame_type, pkt_num_len, used_len);
		}
		else
		{
			//special packet
			if(frame_type&STREAM)
			{
				ret=gquic_frame_type_stream(pstream, a_quic_stream, quic_data, quic_data_len, frame_type, used_len, a_packet);
			}
			else if(frame_type&ACK)
			{
				gquic_frame_type_ack(a_quic_stream, quic_data, quic_data_len, frame_type, used_len);
			}
			else
			{
				*used_len+=1;
				ret=QUIC_FALSE;
			}
		}

		if(ret!=QUIC_TRUE)
		{
			return ;
		}
	}
	return;
}


//QUIC_DATA:is quic data pcap;QUIC_TRUE:is handshake pcap;QUIC_RETURN_DROPME:not quic protocol;
UCHAR is_handshake_pkt(struct quic_stream* a_quic_stream,uint32_t pkt_num_len, char * quic_data, UINT32 quic_data_len, UINT32 *used_len)
{
	int ret=0;
	UINT8 frame_type=0;
	UINT32 message_tag;

	while(*used_len < quic_data_len)
	{
		frame_type = quic_data[*used_len];
 
		if(!(frame_type & FRAM_SPECIAL))
		{
			ret=gquic_frame_type_control(a_quic_stream, quic_data, quic_data_len, frame_type, pkt_num_len, used_len);
			a_quic_stream->fin_flag=QUIC_FALSE; // is_handshake_pkt don't identify QUIC; but function set QUIC_TRUE
			if(ret!=QUIC_TRUE)
			{
				return ret;
			}
		}
		else
		{
			if(frame_type&STREAM)
			{
				if(frame_type&STREAM_D)
				{
					*used_len+=2;
				}
				*used_len+=1;
				*used_len+=read_stream_len(frame_type);
				*used_len+=read_offset_len(frame_type);
				
				if((quic_data_len-*used_len)<=4)
				{
					return QUIC_FALSE;
				}
				
				strncpy((char*)&message_tag, quic_data+*used_len, 4);
				if(ntohl(message_tag)==CHLO || ntohl(message_tag)==SHLO || ntohl(message_tag)==REJ)
				{
					return QUIC_TRUE;
				}
			}
			else if(frame_type&ACK)
			{
				gquic_frame_type_ack(a_quic_stream, quic_data, quic_data_len, frame_type, used_len);
			}
			else
			{
				*used_len +=1;
				return QUIC_FALSE;
			}
		}
	}
	
	return QUIC_FALSE;
}

UINT8 parse_gquic_Q046(struct streaminfo *pstream, void* a_packet, char * payload, uint32_t payload_len, uint32_t *used_len, struct quic_stream* a_quic_stream, uint8_t pub_flags)
{
	uint8_t frame_type;
	uint16_t tag_num=0;
	uint32_t stream_id, message_tag;
	
	if(!a_canRead(25, payload_len, *used_len)) 
	{
		return QUIC_RETURN_DROPME;
	}
	
	*used_len += 25;
	
	while(*used_len < payload_len)
	{
		a_readUInt8(&frame_type, payload, payload_len, used_len);
		if(frame_type & STREAM)
		{
			stream_id=get_stream_id(pstream, payload, frame_type, used_len); 
			if(stream_id==1)
			{
				message_tag = a_pntoh32((void *)payload, *used_len);
				*used_len += 4;
				tag_num = a_pletoh16(payload, *used_len);
				*used_len += 2;       //tag_num
				*used_len += 2;       //padding
				switch(message_tag)
				{
					case CHLO: //MTAG_CHLO;
						if(a_quic_stream->st_client_hello.ext_tags==NULL && tag_num>0)
						{
							a_quic_stream->st_client_hello.ext_tags=(quic_tlv_t **)dictator_malloc(pstream->threadnum, tag_num*sizeof(quic_tlv_t*));
							a_quic_stream->st_client_hello.ext_tag_num = tag_num;
						}
						
						gquic_proc_tag(pstream, a_quic_stream, tag_num, C2S, a_packet, payload, payload_len, used_len);
						
						if(a_quic_stream->st_client_hello.server_name_len > 0 ||  a_quic_stream->st_client_hello.user_agent_len > 0)
						{
							quic_callPlugins(a_quic_stream, pstream, QUIC_CLIENT_HELLO_MASK, pstream->threadnum, a_packet);
						}
						break;
					default:
						break;
				}
			}
		}
	}
	
	return QUIC_RETURN_NORM;
}

UINT8 parse_gquic(struct streaminfo *pstream, void* a_packet, char * payload, uint32_t payload_len, uint32_t *used_len, struct quic_stream* a_quic_stream, uint8_t pub_flags)
{
	int is_handshake=0;
	uint32_t pkt_num_len = 0;
	uint32_t skip_len=0;
		
	pkt_num_len=read_seq_num_len(pub_flags);
	
	//version 协商
	if(!(PUBLIC_FLAG_VER&pub_flags!=0) && a_quic_stream->version && !a_quic_stream->version_cfm)
	{
		a_quic_stream->version_cfm = QUIC_TRUE;
		quic_callPlugins(a_quic_stream, pstream, QUIC_VERSION_MASK, pstream->threadnum, a_packet);
		MESA_handle_runtime_log(g_quic_param.logger, RLOG_LV_DEBUG, "QUIC_VERSION", "version: %u addr: %s", a_quic_stream->version, printaddr(&pstream->addr, pstream->threadnum));
	}

	skip_len=*used_len;
	is_handshake=is_handshake_pkt(a_quic_stream, pkt_num_len, payload, payload_len, &skip_len);  // just identify
	switch(is_handshake)
	{
		case	QUIC_TRUE: //handshake
			a_quic_stream->is_quic_stream = QUIC_TRUE;
			gquic_proc_unencrypt(pstream, a_quic_stream, pkt_num_len, a_packet, payload, payload_len, used_len);
			break;
		case	QUIC_DATA: //ack or special stream
			a_quic_stream->is_quic_stream = QUIC_TRUE;
			break;
		default: //gquic data or not gquic packet
			if(!a_quic_stream->is_quic_stream)
			{
				return QUIC_RETURN_DROPME;
			}
			
			quic_callPlugins(a_quic_stream, pstream, QUIC_APPLICATION_DATA_MASK, pstream->threadnum, a_packet);
			break;			
	}

	return QUIC_RETURN_NORM;
}


//cid->version->nounce->pkt num->ahn hash(12)
UINT8 gquic_process(struct streaminfo *pstream, struct quic_stream* a_quic_stream, int thread_seq, void* a_packet)
{
	uint8_t pub_flags = 0;
	uint32_t used_len = 0;
	int ret=QUIC_RETURN_DROPME;
	enum GQUIC_VERSION is_gquic=GQUIC_UNKNOWN;
	struct udpdetail *udp_detail=(struct udpdetail *)pstream->pdetail;

	if(!a_quic_stream->is_quic_stream && udp_detail->datalen<=GQUIC_HEADER_LEN)
	{		
		MESA_handle_runtime_log(g_quic_param.logger,
								RLOG_LV_DEBUG,
								"QUIC",
								"This is not quic (!a_quic_stream->is_quic_stream)=%d, or packet length is litter udp_detail->datalen<=GQUIC_HEADER_LEN(%d<=%d) addr: %s",
								!a_quic_stream->is_quic_stream, 
								udp_detail->datalen,
								GQUIC_HEADER_LEN,
								printaddr(&pstream->addr, thread_seq));
		return QUIC_RETURN_DROPME;
	}
	
	if(udp_detail->pdata==NULL || udp_detail->datalen<=0)
	{
		return QUIC_RETURN_NORM;
	}

	is_gquic=is_gquic_protocol(pstream, (char *)udp_detail->pdata, udp_detail->datalen, &pub_flags, &a_quic_stream->version, &used_len);
	if(is_gquic!=GQUIC_UNKNOWN)
	{
		a_quic_stream->is_quic_stream=QUIC_TRUE;
		quic_callPlugins(a_quic_stream, pstream, QUIC_VERSION_MASK, thread_seq, a_packet);

		switch(is_gquic)
		{
			case	GQUIC_OTHERS:
				ret=parse_gquic(pstream, a_packet, (char *)udp_detail->pdata, udp_detail->datalen, &used_len, a_quic_stream, pub_flags);
				break;
			case	GQUIC_Q046:
				ret=parse_gquic_Q046(pstream, a_packet, (char *)udp_detail->pdata, udp_detail->datalen, &used_len, a_quic_stream, pub_flags);
				break;
			default:
				break;
		}
	}

	if(a_quic_stream->is_quic_stream==QUIC_TRUE)
	{
		return QUIC_RETURN_NORM;
	}
	
	return ret;
}


UINT32 read_offset_len(UINT8 frame_type)
{
	switch((frame_type&STREAM_OOO)>>2)
	{
		case 0:
			return 0;
			break;
		case 1:
			return 2;
			break;
		case 2:
			return 3;
			break;
		case 3:
			return 4;
			break;
		case 4:
			return 5;
			break;
		case 5:
			return 6;
			break;
		case 6:
			return 7;
			break;
		case 7:
			return 8;
			break;
		default:
			break;
	}
	
	return 0;
}

UINT32 read_stream_len(UINT8 frame_type)
{
	UINT32 stream_len = 0;
	switch(frame_type&STREAM_SS)
	{
		case STREAM_ID_1BYTE:
			stream_len = 1;
			break;
		case STREAM_ID_2BYTE:
			stream_len = 2;
			break;
		case STREAM_ID_3BYTE:
			stream_len = 3;
			break;
		case STREAM_ID_4BYTE:
			stream_len = 4;
			break;
		default:
			break;
	}
	
	return stream_len;
}

int read_conn_id_len(UINT8 flags) 
{
	switch (flags&BYTE_CNTID_8)
	{
		case BYTE_CNTID_8:
			return 8;
		case BYTE_CNTID_0:
			return 0;
		default:
			return 0;  // modify by liuxueli 20200522
			//return -1;
	}
}

UINT32 read_seq_num_len(UINT8 flags)
{
	switch (flags & PKT_NUM_6) 
	{
		case PKT_NUM_6:
			return 6;
		case PKT_NUM_4:
			return 4;
		case PKT_NUM_2:
			return 2;
		case PKT_NUM_1:
			return 1;
		default:
			break;
	}
  
  return 1;
}


UINT32 read_largest_observed_len(UINT8 frame_type)
{
	switch((frame_type & ACK_LL) >> 2)
	{
		case 0:
			return 1;
			break;
		case 1:
			return 2;
			break;
		case 2:
			return 4;
			break;
		case 3:
			return 6;
			break;
		default:
			break;
	}
	
	return 1;
}

UINT32 read_missing_packet_len(UINT8 frame_type)
{
	switch(frame_type & ACK_MM)
	{
		case 0:
			return 1;
			break;
		case 1:
			return 2;
			break;
		case 2:
			return 4;
			break;
		case 3:
			return 6;
			break;
		default:
			break;
	}
	
	return 1;
}