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packets.h

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/*! \file packets.h
    Header file for the low level DHCP packet manipulation module (packet.c).
 */

#ifdef __cplusplus
extern "C" {
#endif

#ifndef PACKETS_HEADER_FILE
#define PACKETS_HEADER_FILE

#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <errno.h>
#include <stdarg.h>

#include "packets_data.h" 
#include "conversion.h"


/*! \brief Maximum number of characters used to represent a hardware address in standard ':' notation
           (HH:HH:HH:HH:HH:HH). Maximum size is 16*2 + 15 + 1 = 48
           <UL>
              <LI>The binary representation is 16 bytes long (maximum).
                  1 byte is represented by 2 hexa characters. So, we have 16*2 hexa characters.
              <LI>Each couple of 2 hexa characters is separated by a ':' character. So we need 15 characters ':'.
              <LI>We add 1 byte for the terminal zero.
           </UL>
 */

#define DHCP_P_STR_HADDR_SIZE 48

/*! \brief Maximum number of characters used to represent a hardware address in hexa (without ':' separators).
           Maximum size is 16*2 + 1 = 33
           <UL>
              <LI>The binary representation is 16 bytes long (maximum).
                  1 byte is represented by 2 hexa characters. So, we have 16*2 hexa characters.
              <LI>We add 1 byte for the terminal zero.
           </UL>
 */

#define DHCP_P_STR_HADDR_SIZE_EXACT 33

/*! \brief Maximum number of characters used to represent the field 'sname' of a DHCP packet.
           The size of the field 'sname' of a DHCP packet is 64 bytes. We add one byte for the terminal zero.
 */

#define DHCP_P_STR_SNAME_SIZE 65

/*! \brief Maximum number of characters used to represent the field 'file' of a DHCP packet.
           The size of the field 'file' of a DHCP packet is 128 bytes. We add one byte for the terminal zero.
 */

#define DHCP_P_STR_FILE_SIZE  129

/*! \brief Size, in bytes, for the option's value. */

#define OPTIONS_OPTION_VALUE_SIZE         256





void packet_logging_service (int dbg,
                             char *logfile,
                             int (*logger) (const char *file, const char * fmt,...));

void packets_clear (struct dhcp_packet *p);

void packets_set_op (struct dhcp_packet *p, int op);
void packets_set_htype (struct dhcp_packet *p, int htype);
void packets_set_hlen (struct dhcp_packet *p, int hlen);
void packets_set_hops (struct dhcp_packet *p, int hops);
void packets_set_xid (struct dhcp_packet *p, unsigned long int xid);
void packets_set_secs (struct dhcp_packet *p, unsigned short int secs);
void packets_set_flags (struct dhcp_packet *p, unsigned short int flags);
int packets_set_ciaddr (struct dhcp_packet *p, char *ciaddr);
void packets_set_bin_ciaddr (struct dhcp_packet *p, unsigned long int ciaddr);
int packets_set_yiaddr (struct dhcp_packet *p, char *yiaddr);
int packets_set_siaddr (struct dhcp_packet *p, char *siaddr);
int packets_set_giaddr (struct dhcp_packet *p, char *giaddr);
void packets_set_bin_giaddr (struct dhcp_packet *p, unsigned long int giaddr);
void packets_set_chaddr (struct dhcp_packet *p, char *chaddr);
void packets_set_sname (struct dhcp_packet *p, char *sname);
void packets_set_file (struct dhcp_packet *p, char *file);

unsigned char packets_get_op (struct dhcp_packet *p);
unsigned char packets_get_htype (struct dhcp_packet *p);
unsigned char packets_get_hlen (struct dhcp_packet *p);
unsigned char packets_get_hops (struct dhcp_packet *p);
unsigned long int packets_get_xid (struct dhcp_packet *p);
unsigned short int packets_get_secs (struct dhcp_packet *p);
unsigned short int packets_get_flags (struct dhcp_packet *p);
char* packets_get_ciaddr (struct dhcp_packet *p);
unsigned long int packets_get_bin_ciaddr (struct dhcp_packet *p);
char* packets_get_yiaddr (struct dhcp_packet *p);
char* packets_get_siaddr (struct dhcp_packet *p);
char* packets_get_giaddr (struct dhcp_packet *p);
unsigned long int packets_get_bin_giaddr (struct dhcp_packet *p);
char* packets_get_chaddr (struct dhcp_packet *p);
char* packets_get_chaddr_no_separator (struct dhcp_packet *p);
char* packets_get_bin_chaddr (struct dhcp_packet *p);
char* packets_get_sname (struct dhcp_packet *p);
char* packets_get_file (struct dhcp_packet *p);

char* packets_get_node_id (struct dhcp_packet *p);
unsigned char packets_get_shelf (struct dhcp_packet *p);
unsigned char packets_get_numero_slot (struct dhcp_packet *p);
unsigned char packets_get_numero_port (struct dhcp_packet *p);
unsigned short int packets_get_vci (struct dhcp_packet *p);
unsigned short int packets_get_vlan_id (struct dhcp_packet *p);

void packets_init_option_writer (struct dhcp_packet *p);
void packets_options_clear (struct dhcp_packet *p);
int packets_set_option (struct dhcp_packet *p, unsigned char option, char *value, int len);
void packets_close_option (struct dhcp_packet *p);

void packets_init_option_reader (struct dhcp_packet *p);
int packets_parse_options (struct dhcp_packet *p);
int packets_get_option (struct dhcp_packet *p, int option, int *len, unsigned char **value);
int packets_get_message_type (struct dhcp_packet *p);
char* packets_get_subnet_mask (struct dhcp_packet *p);

void packet_init_dump_service();
int packet_dump (struct dhcp_packet *p, char *file, char *csv, struct sockaddr_in *from, struct sockaddr_in *to);
int check_packet_size (int size);
void packet_set_taille (struct dhcp_packet *p, int taille);

char* packets_type_to_char (int type);

#endif




#ifdef __cplusplus
}
#endif

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