pcap.h

#ifndef PCAP_H
#define PCAP_H

#include "network.h"
#include "scream.h"
#include <pcap.h>
#include <ctype.h>

#define PCAP_BUFSIZ PCAP_BUF_SIZE * 8
#define SIZE_ETHERNET 14

/* Ethernet addresses are 6 bytes */
#define ETHER_ADDR_LEN	6


struct sniff_ethernet {
    u_char ether_dhost[ETHER_ADDR_LEN]; /* Destination host address */
    u_char ether_shost[ETHER_ADDR_LEN]; /* Source host address */
    u_short ether_type;                 /* IP? ARP? RARP? etc */
};

struct sniff_ip {
    u_char ip_vhl;      /* version << 4 | header length >> 2 */
    u_char ip_tos;      /* type of service */
    u_short ip_len;     /* total length */
    u_short ip_id;      /* identification */
    u_short ip_off;     /* fragment offset field */
#define IP_RF 0x8000        /* reserved fragment flag */
#define IP_DF 0x4000        /* dont fragment flag */
#define IP_MF 0x2000        /* more fragments flag */
#define IP_OFFMASK 0x1fff   /* mask for fragmenting bits */
    u_char ip_ttl;      /* time to live */
    u_char ip_p;        /* protocol */
    u_short ip_sum;     /* checksum */
    struct in_addr ip_src,ip_dst; /* source and dest address */
};
#define IP_HL(ip)       (((ip)->ip_vhl) & 0x0f)
#define IP_V(ip)        (((ip)->ip_vhl) >> 4)

struct sniff_udp {
    u_short uh_sport;               /* source port */
    u_short uh_dport;               /* destination port */
    u_short uh_ulen;                /* udp length */
    u_short uh_sum;                 /* udp checksum */
};

int init_pcap(const char* interface_name, int port, char* multicast_group);

int run_pcap(int (*output_function)(receiver_data_t*));

#endif