slitheen/server/flow.h

#ifndef __RELAY_H__
#define __RELAY_H__

#include <netinet/in.h>
#include "ptwist.h"

#define MAX_FLOWS 10

#define TLS_HELLO_REQ 0x00
#define TLS_CLNT_HELLO 0x01
#define TLS_SERV_HELLO 0x02
#define TLS_NEW_SESS 0x04
#define TLS_CERT 0x0b
#define TLS_SRVR_KEYEX 0x0c
#define TLS_CERT_REQ 0x0d
#define TLS_SRVR_HELLO_DONE 0x0e
#define TLS_CERT_VERIFY 0x0f
#define TLS_CLNT_KEYEX 0x10
#define TLS_FINISHED 0x14

struct packet_st{
	uint32_t seq_num;
	uint16_t len;
	uint16_t data_len;
	uint8_t *data;
	struct packet_st *next;
};

typedef struct packet_st packet;

typedef struct flow_st {
	struct in_addr src_ip, dst_ip; /* Source and Destination addresses */
	uint16_t src_port, dst_port;	/* Source and Destination ports */

	uint32_t seq_num;		/* sequence number */

	byte key[16];		/* negotiated key */
	int state;		/* TLS handshake state */
	int encrypted;		/* indicates whether flow is encrypted */
	packet *packet_chain; /* currently held data */

} flow;

typedef struct flow_table_st {
	flow *table;
	int len;
	int max_len;
} flow_table;


int init_flow_table (void);
int add_flow(flow newFlow);
int update_flow(flow *f);
int remove_flow(int index);
int check_flow(flow observed);
flow *get_flow(int index);

int add_packet(flow *f, uint8_t *data);

#endif /* __RELAY_H__ */