packet.h

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#ifndef _PACKET_H
#define _PACKET_H

#include <netinet/udp.h>
#include <netinet/ip.h>

struct dhcpMessage {
        u_int8_t op;
        u_int8_t htype;
        u_int8_t hlen;
        u_int8_t hops;
        u_int32_t xid;
        u_int16_t secs;
        u_int16_t flags;
        u_int32_t ciaddr;
        u_int32_t yiaddr;
        u_int32_t siaddr;
        u_int32_t giaddr;
        u_int8_t chaddr[16];
        u_int8_t sname[64];
        u_int8_t file[128];
        u_int32_t cookie;
        u_int8_t options[308]; /* 312 - cookie */ 
};

struct udp_dhcp_packet {
        struct iphdr ip;
        struct udphdr udp;
        struct dhcpMessage data;
};

void init_header(struct dhcpMessage *packet, char type);
int get_packet(struct dhcpMessage *packet, int fd);
u_int16_t checksum(void *addr, int count);
int raw_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
                   u_int32_t dest_ip, int dest_port, unsigned char *dest_arp, int ifindex);
int kernel_packet(struct dhcpMessage *payload, u_int32_t source_ip, int source_port,
                   u_int32_t dest_ip, int dest_port);


#endif

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