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/** @file

 */

#ifndef __LWIP_DHCP_H__

#define __LWIP_DHCP_H__

#include "lwip/opt.h"

#if LWIP_DHCP /* don't build if not configured for use in lwipopts.h */

#include "lwip/netif.h"

#include "lwip/udp.h"

#ifdef __cplusplus

extern "C" {

#endif

/** period (in seconds) of the application calling dhcp_coarse_tmr() */

#define DHCP_COARSE_TIMER_SECS 60 

/** period (in milliseconds) of the application calling dhcp_coarse_tmr() */

#define DHCP_COARSE_TIMER_MSECS (DHCP_COARSE_TIMER_SECS * 1000UL)

/** period (in milliseconds) of the application calling dhcp_fine_tmr() */

#define DHCP_FINE_TIMER_MSECS 500 

struct dhcp

{

  /** transaction identifier of last sent request */

  u32_t xid;

  /** our connection to the DHCP server */

  struct udp_pcb *pcb;

  /** incoming msg */

  struct dhcp_msg *msg_in;

  /** incoming msg options */

  void *options_in;

  /** ingoing msg options length */

  u16_t options_in_len;

  /** current DHCP state machine state */

  u8_t state;

  /** retries of current request */

  u8_t tries;

  struct pbuf *p_out; /* pbuf of outcoming msg */

  struct dhcp_msg *msg_out; /* outgoing msg */

  u16_t options_out_len; /* outgoing msg options length */

  u16_t request_timeout; /* #ticks with period DHCP_FINE_TIMER_SECS for request timeout */

  u16_t t1_timeout;  /* #ticks with period DHCP_COARSE_TIMER_SECS for renewal time */

  u16_t t2_timeout;  /* #ticks with period DHCP_COARSE_TIMER_SECS for rebind time */

  struct ip_addr server_ip_addr; /* dhcp server address that offered this lease */

  struct ip_addr offered_ip_addr;

  struct ip_addr offered_sn_mask;

  struct ip_addr offered_gw_addr;

  struct ip_addr offered_bc_addr;

#define DHCP_MAX_DNS 2

  u32_t dns_count; /* actual number of DNS servers obtained */

  struct ip_addr offered_dns_addr[DHCP_MAX_DNS]; /* DNS server addresses */

  u32_t offered_t0_lease; /* lease period (in seconds) */

  u32_t offered_t1_renew; /* recommended renew time (usually 50% of lease period) */

  u32_t offered_t2_rebind; /* recommended rebind time (usually 66% of lease period)  */

#if LWIP_DHCP_AUTOIP_COOP

  u8_t autoip_coop_state;

#endif

/** Patch #1308

 *  TODO: See dhcp.c "TODO"s

 */

#if 0

  struct ip_addr offered_si_addr;

  u8_t *boot_file_name;

#endif

};

/* MUST be compiled with "pack structs" or equivalent! */

#ifdef PACK_STRUCT_USE_INCLUDES

#  include "arch/bpstruct.h"

#endif

PACK_STRUCT_BEGIN

/** minimum set of fields of any DHCP message */

struct dhcp_msg

{

  PACK_STRUCT_FIELD(u8_t op);

  PACK_STRUCT_FIELD(u8_t htype);

  PACK_STRUCT_FIELD(u8_t hlen);

  PACK_STRUCT_FIELD(u8_t hops);

  PACK_STRUCT_FIELD(u32_t xid);

  PACK_STRUCT_FIELD(u16_t secs);

  PACK_STRUCT_FIELD(u16_t flags);

  PACK_STRUCT_FIELD(struct ip_addr ciaddr);

  PACK_STRUCT_FIELD(struct ip_addr yiaddr);

  PACK_STRUCT_FIELD(struct ip_addr siaddr);

  PACK_STRUCT_FIELD(struct ip_addr giaddr);

#define DHCP_CHADDR_LEN 16U

  PACK_STRUCT_FIELD(u8_t chaddr[DHCP_CHADDR_LEN]);

#define DHCP_SNAME_LEN 64U

  PACK_STRUCT_FIELD(u8_t sname[DHCP_SNAME_LEN]);

#define DHCP_FILE_LEN 128U

  PACK_STRUCT_FIELD(u8_t file[DHCP_FILE_LEN]);

  PACK_STRUCT_FIELD(u32_t cookie);

#define DHCP_MIN_OPTIONS_LEN 68U

/** make sure user does not configure this too small */

#if ((defined(DHCP_OPTIONS_LEN)) && (DHCP_OPTIONS_LEN < DHCP_MIN_OPTIONS_LEN))

#  undef DHCP_OPTIONS_LEN

#endif

/** allow this to be configured in lwipopts.h, but not too small */

#if (!defined(DHCP_OPTIONS_LEN))

/** set this to be sufficient for your options in outgoing DHCP msgs */

#  define DHCP_OPTIONS_LEN DHCP_MIN_OPTIONS_LEN

#endif

  PACK_STRUCT_FIELD(u8_t options[DHCP_OPTIONS_LEN]);

} PACK_STRUCT_STRUCT;

PACK_STRUCT_END

#ifdef PACK_STRUCT_USE_INCLUDES

#  include "arch/epstruct.h"

#endif

/** start DHCP configuration */

err_t dhcp_start(struct netif *netif);

/** enforce early lease renewal (not needed normally)*/

err_t dhcp_renew(struct netif *netif);

/** release the DHCP lease, usually called before dhcp_stop()*/

err_t dhcp_release(struct netif *netif);

/** stop DHCP configuration */

void dhcp_stop(struct netif *netif);

/** inform server of our manual IP address */

void dhcp_inform(struct netif *netif);

/** Handle a possible change in the network configuration */

void dhcp_network_changed(struct netif *netif);

/** if enabled, check whether the offered IP address is not in use, using ARP */

#if DHCP_DOES_ARP_CHECK

void dhcp_arp_reply(struct netif *netif, struct ip_addr *addr);

#endif

/** to be called every minute */

void dhcp_coarse_tmr(void);

/** to be called every half second */

void dhcp_fine_tmr(void);

/** DHCP message item offsets and length */

#define DHCP_MSG_OFS (UDP_DATA_OFS)  

  #define DHCP_OP_OFS (DHCP_MSG_OFS + 0)

  #define DHCP_HTYPE_OFS (DHCP_MSG_OFS + 1)

  #define DHCP_HLEN_OFS (DHCP_MSG_OFS + 2)

  #define DHCP_HOPS_OFS (DHCP_MSG_OFS + 3)

  #define DHCP_XID_OFS (DHCP_MSG_OFS + 4)

  #define DHCP_SECS_OFS (DHCP_MSG_OFS + 8)

  #define DHCP_FLAGS_OFS (DHCP_MSG_OFS + 10)

  #define DHCP_CIADDR_OFS (DHCP_MSG_OFS + 12)

  #define DHCP_YIADDR_OFS (DHCP_MSG_OFS + 16)

  #define DHCP_SIADDR_OFS (DHCP_MSG_OFS + 20)

  #define DHCP_GIADDR_OFS (DHCP_MSG_OFS + 24)

  #define DHCP_CHADDR_OFS (DHCP_MSG_OFS + 28)

  #define DHCP_SNAME_OFS (DHCP_MSG_OFS + 44)

  #define DHCP_FILE_OFS (DHCP_MSG_OFS + 108)

#define DHCP_MSG_LEN 236

#define DHCP_COOKIE_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN)

#define DHCP_OPTIONS_OFS (DHCP_MSG_OFS + DHCP_MSG_LEN + 4)

#define DHCP_CLIENT_PORT 68  

#define DHCP_SERVER_PORT 67

/** DHCP client states */

#define DHCP_REQUESTING 1

#define DHCP_INIT 2

#define DHCP_REBOOTING 3

#define DHCP_REBINDING 4

#define DHCP_RENEWING 5

#define DHCP_SELECTING 6

#define DHCP_INFORMING 7

#define DHCP_CHECKING 8

#define DHCP_PERMANENT 9

#define DHCP_BOUND 10

/** not yet implemented #define DHCP_RELEASING 11 */

#define DHCP_BACKING_OFF 12

#define DHCP_OFF 13

/** AUTOIP cooperatation flags */

#define DHCP_AUTOIP_COOP_STATE_OFF 0

#define DHCP_AUTOIP_COOP_STATE_ON 1

#define DHCP_BOOTREQUEST 1

#define DHCP_BOOTREPLY 2

#define DHCP_DISCOVER 1

#define DHCP_OFFER 2

#define DHCP_REQUEST 3

#define DHCP_DECLINE 4

#define DHCP_ACK 5

#define DHCP_NAK 6

#define DHCP_RELEASE 7

#define DHCP_INFORM 8

#define DHCP_HTYPE_ETH 1

#define DHCP_HLEN_ETH 6

#define DHCP_BROADCAST_FLAG 15

#define DHCP_BROADCAST_MASK (1 << DHCP_FLAG_BROADCAST)

/** BootP options */

#define DHCP_OPTION_PAD 0

#define DHCP_OPTION_SUBNET_MASK 1 /* RFC 2132 3.3 */

#define DHCP_OPTION_ROUTER 3

#define DHCP_OPTION_DNS_SERVER 6 

#define DHCP_OPTION_HOSTNAME 12

#define DHCP_OPTION_IP_TTL 23

#define DHCP_OPTION_MTU 26

#define DHCP_OPTION_BROADCAST 28

#define DHCP_OPTION_TCP_TTL 37

#define DHCP_OPTION_END 255

/** DHCP options */

#define DHCP_OPTION_REQUESTED_IP 50 /* RFC 2132 9.1, requested IP address */

#define DHCP_OPTION_LEASE_TIME 51 /* RFC 2132 9.2, time in seconds, in 4 bytes */

#define DHCP_OPTION_OVERLOAD 52 /* RFC2132 9.3, use file and/or sname field for options */

#define DHCP_OPTION_MESSAGE_TYPE 53 /* RFC 2132 9.6, important for DHCP */

#define DHCP_OPTION_MESSAGE_TYPE_LEN 1

#define DHCP_OPTION_SERVER_ID 54 /* RFC 2132 9.7, server IP address */

#define DHCP_OPTION_PARAMETER_REQUEST_LIST 55 /* RFC 2132 9.8, requested option types */

#define DHCP_OPTION_MAX_MSG_SIZE 57 /* RFC 2132 9.10, message size accepted >= 576 */

#define DHCP_OPTION_MAX_MSG_SIZE_LEN 2

#define DHCP_OPTION_T1 58 /* T1 renewal time */

#define DHCP_OPTION_T2 59 /* T2 rebinding time */

#define DHCP_OPTION_US 60

#define DHCP_OPTION_CLIENT_ID 61

#define DHCP_OPTION_TFTP_SERVERNAME 66

#define DHCP_OPTION_BOOTFILE 67

/** possible combinations of overloading the file and sname fields with options */

#define DHCP_OVERLOAD_NONE 0

#define DHCP_OVERLOAD_FILE 1

#define DHCP_OVERLOAD_SNAME  2

#define DHCP_OVERLOAD_SNAME_FILE 3

#ifdef __cplusplus

}

#endif

#endif /* LWIP_DHCP */

#endif /*__LWIP_DHCP_H__*/