packet.h

#ifndef _PACKET_H
#define _PACKET_H

#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>

#include "types.h"
#include "epoll.h"

#define DDHCP_MSG_UPDATECLAIM 1
#define DDHCP_MSG_INQUIRE 2
#define DDHCP_MSG_RENEWLEASE 16
#define DDHCP_MSG_LEASEACK 17
#define DDHCP_MSG_LEASENAK 18
#define DDHCP_MSG_RELEASE 19


struct ddhcp_mcast_packet {
  ddhcp_node_id node_id;
  struct in_addr prefix;
  uint8_t prefix_len;
  uint8_t blocksize;
  uint8_t command;
  uint8_t count;

  struct sockaddr_in6* sender;

  union {
    struct ddhcp_payload* payload;
    struct ddhcp_renew_payload* renew_payload;
  };
};
typedef struct ddhcp_mcast_packet ddhcp_mcast_packet;

struct ddhcp_payload {
  uint32_t block_index;
  uint16_t timeout;
  uint16_t reserved;
};
typedef struct ddhcp_payload ddhcp_payload;

struct ddhcp_renew_payload {
  uint8_t chaddr[16];
  uint32_t address;
  uint32_t xid;
  uint32_t lease_seconds;
};
typedef struct ddhcp_renew_payload ddhcp_renew_payload;

ATTR_NONNULL_ALL struct ddhcp_mcast_packet* new_ddhcp_packet(uint8_t command, ddhcp_config* config);
ATTR_NONNULL_ALL ssize_t ntoh_mcast_packet(uint8_t* buffer, ssize_t len, struct ddhcp_mcast_packet* packet);

ATTR_NONNULL_ALL ssize_t send_packet_mcast(struct ddhcp_mcast_packet* packet, ddhcp_epoll_data* data);
ATTR_NONNULL_ALL ssize_t send_packet_direct(struct ddhcp_mcast_packet* packet, struct in6_addr* dest, ddhcp_epoll_data* data);

#endif