newcamd-client.h

Example Dreambox CAM source code

// implements the newcamd protocol

#ifndef __NEWCAMD_CLIENT_H__
#define __NEWCAMD_CLIENT_H__

#include "rqcamd.h"
#include "des.h"

#define NETWORK_TIMEOUT 10000 //10 seconds
#define MAX_CARD_PROVIDER_COUNT 8

// ------------------------------------ triple des class declaration ----------------------------------------
class triple_des
{
	private:
	i_DES_key_schedule ks1,ks2;
	void set_odd_parity(unsigned char *key);
	
	public:
	triple_des( void );
	unsigned char des_key[16];

	void schedule_key( void );
	int pad_message(unsigned char *data, unsigned short int len);

	unsigned char xor_checksum(const unsigned char *buf, unsigned int length);
	void xor_buffers(unsigned char *dest, unsigned char *src_1, unsigned char *src_2, unsigned int length);
	
	// 14 byte key input, 16 byte expanded output
	void expand(unsigned char *expanded, unsigned char *normal);
	int decrypt(unsigned char *data, int len);
	int encrypt(const unsigned char *data, int len, unsigned char *crypt);
};

// ------------------------------------ newcamd client class declarations --------------------------------------
#define CWS_NETMSGSIZE   240
#define USERNAME_LENGTH  32
#define PASSWORD_LENGTH  32
#define CWS_FIRSTCMDNO   0xE0

typedef enum
{
	MSG_CLIENT_2_SERVER_LOGIN = CWS_FIRSTCMDNO,
	MSG_CLIENT_2_SERVER_LOGIN_ACK,
	MSG_CLIENT_2_SERVER_LOGIN_NAK,
	MSG_CARD_DATA_REQ,
	MSG_CARD_DATA,
	MSG_SERVER_2_CLIENT_NAME,
	MSG_SERVER_2_CLIENT_NAME_ACK,
	MSG_SERVER_2_CLIENT_NAME_NAK,
	MSG_SERVER_2_CLIENT_LOGIN,
	MSG_SERVER_2_CLIENT_LOGIN_ACK,
	MSG_SERVER_2_CLIENT_LOGIN_NAK,
	MSG_ADMIN,
	MSG_ADMIN_ACK,
	MSG_ADMIN_LOGIN,
	MSG_ADMIN_LOGIN_ACK,
	MSG_ADMIN_LOGIN_NAK,
	MSG_ADMIN_COMMAND,
	MSG_ADMIN_COMMAND_ACK,
	MSG_ADMIN_COMMAND_NAK
} net_msg_type_t;


typedef enum
{
	LOGIN_KEY,
	SESSION_KEY
} key_encryption_t;

typedef enum
{
	VERSION_520,
	VERSION_525
} protocol_version_t;

class newcamd_client
{
	public:
	newcamd_client(char *server_url, unsigned int timeout, protocol_version_t version = VERSION_525);
	~newcamd_client(void);
	
	// configuration related
	unsigned int status;
	char status_description[128];
	bool process_emms;
	int dbg;
	
	short int user_id;
	unsigned short int card_caid;
	unsigned short int card_provider_id[MAX_CARD_PROVIDER_COUNT];
	unsigned short int card_provider_id_count;
	unsigned char cam_id[4];
	
	//control words
	unsigned char cw_0[8];
	unsigned char cw_1[8];
	
	//verbs
	bool is_ready( void );
	void send_ecm(unsigned char *ecm_data, unsigned short int ecm_data_length, unsigned short int sid);
	void send_emm(unsigned char *emm_data, unsigned short int emm_data_length);
	
	private:
	int fd; //file descriptor for network connections.
	triple_des des;
	
	unsigned short int sent_sequence_id;
	unsigned short int received_sequence_id;
	
	bool ready;
	int network_timeout;
	
	protocol_version_t protocol_version;
	unsigned char custom_data[8];
	unsigned short int custom_data_length;
	
	char url[128];
	char hostname[64];
	unsigned int port;
	char username[32];
	char password[32];
	
	// key related
	unsigned char random_key[14];
	unsigned char des_key[14];
	unsigned char login_key[14];
	unsigned char session_key[14];
	
	unsigned char expanded_login_key[16];
	unsigned char expanded_session_key[16];
	
	//misc
	void set_protocol_version( protocol_version_t version );
	void set_sid( unsigned short int sid );
	
	void create_login_key();
	void create_session_key( char *encrypted_password );
	
	void server_connect( void );
	void server_login( void );
	void server_disconnect( void );
	
	void parse_url( void );
	
	//network related
	int connect_non_blocking(int fd, struct sockaddr_in *addr, unsigned int timeout_seconds);
	
	void send_command( net_msg_type_t command, unsigned char *data, unsigned short int data_length, unsigned char *custom_data, key_encryption_t key_type );
	net_msg_type_t receive_command( unsigned char *custom_data, key_encryption_t key_type );
		
	void send_message(unsigned char *message, unsigned short int length, unsigned char *custom_data, key_encryption_t key_type );
	int receive_message(unsigned char *message, unsigned char *custom_data, key_encryption_t key_type );
	
	int network_write(unsigned char *buffer, unsigned int length);
	int network_read(unsigned char *buffer, unsigned int length, int override_timeout = -1);
	int network_read_poll(int override_timeout = -1);
	
	void debug_output(unsigned char *buffer, unsigned int length, char *header);
};

#endif