packet.h

这个是Linux下的应用程序

#ifndef _PACKET_H
#define _PACKET_H

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

#define DHCP_CLIENT_PORT             68
#define DHCP_SERVER_PORT           67
#define MAC_BCAST_ADDR          (uint8_t *) "\xff\xff\xff\xff\xff\xff"
#define DEFAULT_SCRIPT  "/etc/simple.script"
#define DHCP_MAGIC                0x63825363

struct client_config_t {
	char foreground;		/* Do not fork */
	char quit_after_lease;		/* Quit after obtaining lease */
	char abort_if_no_lease;		/* Abort if no lease */
	char background_if_no_lease;	/* Fork to background if no lease */
	char *interface;		/* The name of the interface to use */
	char *pidfile;			/* Optionally store the process ID */
	char *script;			/* User script to run at dhcp events */
	uint8_t *clientid;		/* Optional client id to use */
	uint8_t *hostname;		/* Optional hostname to use */
	int ifindex;			/* Index number of the interface to use */
	uint8_t arp[6];			/* Our arp address */
};

struct client_config_t client_config = {
	/* Default options. */
	abort_if_no_lease: 0,
	foreground: 0,
	quit_after_lease: 0,
	background_if_no_lease: 0,
	interface: "eth0",
	pidfile: NULL,
	script: DEFAULT_SCRIPT,
	clientid: NULL,
	hostname: NULL,
	ifindex: 0,
	arp: "\0\0\0\0\0\0",		/* appease gcc-3.0 */
};

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 init_header(struct dhcpMessage *packet, char type);
int get_packet(struct dhcpMessage *packet, int fd);
uint16_t checksum(void *addr, int count);
int 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 kernel_packet(struct dhcpMessage *payload, uint32_t source_ip, int source_port,
		   uint32_t dest_ip, int dest_port);


#endif