source: bootcd/isolinux/syslinux-6.03/com32/include/dhcp.h

#ifndef DHCP_H
#define DHCP_H

#include <inttypes.h>

struct dhcp_option {
        void *data;
        int len;
};

struct dhcp_packet {
        uint8_t op;             /*   0 */
        uint8_t htype;          /*   1 */
        uint8_t hlen;           /*   2 */
        uint8_t hops;           /*   3 */
        uint32_t xid;           /*   4 */
        uint16_t secs;          /*   8 */
        uint16_t flags;         /*  10 */
        uint32_t ciaddr;        /*  12 */
        uint32_t yiaddr;        /*  16 */
        uint32_t siaddr;        /*  20 */
        uint32_t giaddr;        /*  24 */
        uint8_t chaddr[16];     /*  28 */
        uint8_t sname[64];      /*  44 */
        uint8_t file[128];      /* 108 */
        uint32_t magic;         /* 236 */
        uint8_t options[4];     /* 240 */
};

#define DHCP_VENDOR_MAGIC       0x63825363

int dhcp_pack_packet(void *packet, size_t *len,
                     const struct dhcp_option opt[256]);

int dhcp_unpack_packet(const void *packet, size_t len,
                       struct dhcp_option opt[256]);

#endif /* DHCP_H */