packet.h

udhcpc code for busybox

#ifndef _PACKET_H
#define _PACKET_H

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

struct dhcpMessage {
	uint8_t op;
	uint8_t htype;
	uint8_t hlen;
	uint8_t hops;
	uint32_t xid;
	uint16_t secs;
	uint16_t flags;
	uint32_t ciaddr;
	uint32_t yiaddr;
	uint32_t siaddr;
	uint32_t giaddr;
	uint8_t chaddr[16];
	uint8_t sname[64];
	uint8_t file[128];
	uint32_t cookie;
	uint8_t options[308]; /* 312 - cookie */
};

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

void udhcp_init_header(struct dhcpMessage *packet, char type);
int udhcp_get_packet(struct dhcpMessage *packet, int fd);
uint16_t udhcp_checksum(void *addr, int count);
int udhcp_raw_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
		   uint32_t dest_ip, int dest_port, uint8_t *dest_arp, int ifindex);
int udhcp_kernel_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
		   uint32_t dest_ip, int dest_port);


#endif