busybox/networking/udhcp/options.h

/* vi: set sw=4 ts=4: */
/* options.h */
#ifndef _OPTIONS_H
#define _OPTIONS_H

#define TYPE_MASK	0x0F

enum {
	OPTION_IP = 1,
	OPTION_IP_PAIR,
	OPTION_STRING,
#if ENABLE_FEATURE_RFC3397
	OPTION_STR1035,	/* RFC1035 compressed domain name list */
#endif
	OPTION_BOOLEAN,
	OPTION_U8,
	OPTION_U16,
	OPTION_S16,
	OPTION_U32,
	OPTION_S32
};

#define OPTION_REQ	0x10 /* have the client request this option */
#define OPTION_LIST	0x20 /* There can be a list of 1 or more of these */

/*****************************************************************/
/* Do not modify below here unless you know what you are doing!! */
/*****************************************************************/

/* DHCP protocol -- see RFC 2131 */
#define DHCP_MAGIC		0x63825363


/* DHCP option codes (partial list) */
#define DHCP_PADDING		0x00
#define DHCP_SUBNET		0x01
#define DHCP_TIME_OFFSET	0x02
#define DHCP_ROUTER		0x03
#define DHCP_TIME_SERVER	0x04
#define DHCP_NAME_SERVER	0x05
#define DHCP_DNS_SERVER		0x06
#define DHCP_LOG_SERVER		0x07
#define DHCP_COOKIE_SERVER	0x08
#define DHCP_LPR_SERVER		0x09
#define DHCP_HOST_NAME		0x0c
#define DHCP_BOOT_SIZE		0x0d
#define DHCP_DOMAIN_NAME	0x0f
#define DHCP_SWAP_SERVER	0x10
#define DHCP_ROOT_PATH		0x11
#define DHCP_IP_TTL		0x17
#define DHCP_MTU		0x1a
#define DHCP_BROADCAST		0x1c
#define DHCP_NTP_SERVER		0x2a
#define DHCP_WINS_SERVER	0x2c
#define DHCP_REQUESTED_IP	0x32
#define DHCP_LEASE_TIME		0x33
#define DHCP_OPTION_OVER	0x34
#define DHCP_MESSAGE_TYPE	0x35
#define DHCP_SERVER_ID		0x36
#define DHCP_PARAM_REQ		0x37
#define DHCP_MESSAGE		0x38
#define DHCP_MAX_SIZE		0x39
#define DHCP_T1			0x3a
#define DHCP_T2			0x3b
#define DHCP_VENDOR		0x3c
#define DHCP_CLIENT_ID		0x3d
#define DHCP_FQDN		0x51
#define DHCP_END		0xFF


#define BOOTREQUEST		1
#define BOOTREPLY		2

#define ETH_10MB		1
#define ETH_10MB_LEN		6

#define DHCPDISCOVER		1
#define DHCPOFFER		2
#define DHCPREQUEST		3
#define DHCPDECLINE		4
#define DHCPACK			5
#define DHCPNAK			6
#define DHCPRELEASE		7
#define DHCPINFORM		8

#define BROADCAST_FLAG		0x8000

#define OPTION_FIELD		0
#define FILE_FIELD		1
#define SNAME_FIELD		2

/* miscellaneous defines */
#define OPT_CODE 0
#define OPT_LEN 1
#define OPT_DATA 2

struct dhcp_option {
	uint8_t flags;
	uint8_t code;
};

extern const struct dhcp_option dhcp_options[];
extern const char dhcp_option_strings[];
extern const uint8_t dhcp_option_lengths[];

uint8_t *get_option(struct dhcpMessage *packet, int code);
int end_option(uint8_t *optionptr);
int add_option_string(uint8_t *optionptr, uint8_t *string);
int add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data);
#if ENABLE_FEATURE_RFC3397
char *dname_dec(const uint8_t *cstr, int clen, const char *pre);
uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen);
#endif

#endif