source: MondoRescue/branches/stable/mindi-busybox/networking/udhcp/options.h@ 1770

/* 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 SERVER_PORT     67
#define CLIENT_PORT     68

#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 {
    char name[12];
    char flags;
    uint8_t code;
};

extern const struct dhcp_option dhcp_options[];
extern const unsigned char 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