/*
 * dhcpcd - DHCP client daemon -
 * Copyright (C) 2005 - 2006 Roy Marples <uberlord@gentoo.org>
 * 
 * dhcpcd is an RFC2131 compliant DHCP client daemon.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#ifndef DHCP_H
#define DHCP_H

#include <sys/types.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/udp.h>

#include "dhcpcd.h"
#include "interface.h"

/* UDP port numbers for DHCP */
#define DHCP_SERVER_PORT 67
#define DHCP_CLIENT_PORT 68

#define MAGIC_COOKIE 0x63825363

/* DHCP message OP code */
#define DHCP_BOOTREQUEST	1
#define DHCP_BOOTREPLY		2

/* DHCP message type */
#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

/* DHCP options */
enum DHCP_OPTIONS
{
  DHCP_PAD				=	0,
  DHCP_NETMASK				=	1,
  DHCP_TIMEROFFSET			=	2,
  DHCP_ROUTERS				=	3,
  DHCP_TIMESERVER			=	4,
  DHCP_NAMESERVER			=	5,
  DHCP_DNSSERVER			=	6,
  DHCP_LOGSERVER			=	7,
  DHCP_COOKIESERVER			=	8,
  DHCP_HOSTNAME				=	12,
  DHCP_DNSDOMAIN			=	15,
  DHCP_ROOTPATH				=	17,
  DHCP_DEFAULTIPTTL			=	23,
  DHCP_MTU				=	26,
  DHCP_BROADCAST			=	28,
  DHCP_MASKDISCOVERY			=	29,
  DHCP_ROUTERDISCOVERY			=	31,
  DHCP_STATICROUTE			=	33,
  DHCP_NISDOMAIN			=	40,
  DHCP_NISSERVER			=	41,
  DHCP_NTPSERVER			=	42,
  DHCP_ADDRESS				=	50,
  DHCP_LEASETIME			=	51,
  DHCP_MESSAGETYPE			=	53,
  DHCP_SERVERIDENTIFIER			=	54,
  DHCP_PARAMETERREQUESTLIST		=	55,
  DHCP_MESSAGE				=	56,
  DHCP_MAXMESSAGESIZE			=	57,
  DHCP_RENEWALTIME			=	58,
  DHCP_REBINDTIME			=	59,
  DHCP_CLASSID				=	60,
  DHCP_CLIENTID				=	61,
  DHCP_USERCLASS			=	77,  /* RFC 3004 */
  DHCP_FQDN				=	81,
  DHCP_DNSSEARCH			=       119, /* RFC 3397 */
  DHCP_CSR				=	121, /* RFC 3442 */
  DHCP_END				=	255
};

/* SetFQDNHostName values - lsnybble used in flags
 * byte (see buildmsg.c), hsnybble to create order
 * and to allow 0x00 to mean disable
 */
enum FQQN {
  FQDN_DISABLE				=	0x00,
  FQDN_NONE				=	0x18,
  FQDN_PTR				=	0x20,
  FQDN_BOTH				=	0x31
};

typedef struct fqdn_t
{
  uint8_t flags;
  uint8_t r1;
  uint8_t r2;
  char *name;
} fqdn_t;

typedef struct dhcp_t
{
  char version[11];

  struct in_addr serveraddress;
  char serverhw[IF_NAMESIZE];
  char servername[64];

  char classid[CLASS_ID_MAX_LEN];
  char clientid[CLIENT_ID_MAX_LEN];
  
  struct in_addr address;
  struct in_addr netmask;
  struct in_addr broadcast;
  unsigned short mtu;

  unsigned leasetime;
  unsigned renewaltime;
  unsigned rebindtime;
  
  route_t *routes;

  char *hostname;
  fqdn_t *fqdn;
 
  address_t *dnsservers;
  char *dnsdomain;
  char *dnssearch;
  
  address_t *ntpservers;

  address_t *nisservers;
  char *nisdomain;

  char *message;
  char *rootpath;
} dhcp_t;

typedef struct dhcpmessage_t
{
  char op;		/* message type */
  char hwtype;		/* hardware address type */
  char hwlen;		/* hardware address length */
  char hwopcount;	/* should be zero in client's message */
  int32_t xid;		/* transaction id */
  int16_t secs;		/* elapsed time in sec. from trying to boot */
  int16_t flags;
  int32_t ciaddr;		/* (previously allocated) client IP address */
  int32_t yiaddr;		/* 'your' client IP address */
  int32_t siaddr;		/* should be zero in client's messages */
  int32_t giaddr;		/* should be zero in client's messages */
  unsigned char hwaddr[16];	/* client's hardware address */
  char servername[64];	/* server host name, null terminated string */
  char bootfile[128];	/* boot file name, null terminated string */
  uint32_t cookie;
  unsigned char options[308];	/* message options - cookie */
} dhcpmessage_t;

struct udp_dhcp_packet
{
  struct ip ip;
  struct udphdr udp;
  dhcpmessage_t dhcp;
};

size_t send_message (interface_t *iface, dhcp_t *dhcp,
		     unsigned long xid, char type, options_t *options);
void free_dhcp (dhcp_t *dhcp);
int parse_dhcpmessage (dhcp_t *dhcp, dhcpmessage_t *message);

#endif