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/* Dynamic Host Configuration Protocol / BOOTP */
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enum
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{
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	OfferTimeout=	60,		/* when an offer times out */
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	MaxLease=	60*60,		/* longest lease for dynamic binding */
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	MinLease=	15*60,		/* shortest lease for dynamic binding */
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	StaticLease=	30*60,		/* lease for static binding */
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	IPUDPHDRSIZE=	28,		/* size of an IP plus UDP header */
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	MINSUPPORTED=	576,		/* biggest IP message the client must support */
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	/* lengths of some bootp fields */
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	Maxhwlen=	16,
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	Maxfilelen=	128,
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	Maxoptlen=	312-4,
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	/* bootp types */
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	Bootrequest=	1,
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	Bootreply= 	2,
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	/* bootp flags */
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	Fbroadcast=	1<<15,
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	/* dhcp v4 types */
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	Discover=	1,
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	Offer=		2,
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	Request=	3,
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	Decline=	4,
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	Ack=		5,
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	Nak=		6,
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	Release=	7,
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	Inform=		8,
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	/* bootp option types */
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	OBend=			255,
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	OBpad=			0,
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	OBmask=			1,
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	OBtimeoff=		2,
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	OBrouter=		3,
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	OBtimeserver=		4,
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	OBnameserver=		5,
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	OBdnserver=		6,
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	OBlogserver=		7,
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	OBcookieserver=		8,
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	OBlprserver=		9,
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	OBimpressserver=	10,
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	OBrlserver=		11,
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	OBhostname=		12,	/* 0x0c */
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	OBbflen=		13,
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	OBdumpfile=		14,
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	OBdomainname=		15,
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	OBswapserver=		16,	/* 0x10 */
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	OBrootpath=		17,
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	OBextpath=		18,
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	OBipforward=		19,
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	OBnonlocal=		20,
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	OBpolicyfilter=		21,
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	OBmaxdatagram=		22,
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	OBttl=			23,
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	OBpathtimeout=		24,
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	OBpathplateau=		25,
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	OBmtu=			26,
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	OBsubnetslocal=		27,
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	OBbaddr=		28,
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	OBdiscovermask=		29,
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	OBsupplymask=		30,
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	OBdiscoverrouter=	31,
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	OBrsserver=		32,	/* 0x20 */
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	OBstaticroutes=		33,
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	OBtrailerencap=		34,
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	OBarptimeout=		35,
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	OBetherencap=		36,
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	OBtcpttl=		37,
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	OBtcpka=		38,
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	OBtcpkag=		39,
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	OBnisdomain=		40,
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	OBniserver=		41,
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	OBntpserver=		42,
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	OBvendorinfo=		43,	/* 0x2b */
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	OBnetbiosns=		44,
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	OBnetbiosdds=		45,
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	OBnetbiostype=		46,
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	OBnetbiosscope=		47,
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	OBxfontserver=		48,	/* 0x30 */
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	OBxdispmanager=		49,
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	OBnisplusdomain=	64,	/* 0x40 */
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	OBnisplusserver=	65,
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	OBhomeagent=		68,
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	OBsmtpserver=		69,
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	OBpop3server=		70,
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	OBnntpserver=		71,
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	OBwwwserver=		72,
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	OBfingerserver=		73,
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	OBircserver=		74,
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	OBstserver=		75,
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	OBstdaserver=		76,
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	/* dhcp v4 options */
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	ODipaddr=		50,	/* 0x32 */
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	ODlease=		51,
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	ODoverload=		52,
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	ODtype=			53,	/* 0x35 */
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	ODserverid=		54,	/* 0x36 */
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	ODparams=		55,	/* 0x37 */
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	ODmessage=		56,
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	ODmaxmsg=		57,
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	ODrenewaltime=		58,
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	ODrebindingtime=	59,
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	ODvendorclass=		60,
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	ODclientid=		61,	/* 0x3d */
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	ODtftpserver=		66,
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	ODbootfile=		67,
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	ODpxearch=		93,	/* see rfc 4578 */
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	ODpxeni=		94,
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	ODpxeguid=		97,
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	/* plan9 vendor info options, v4 addresses only (deprecated) */
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	OP9fsv4=		128,	/* plan9 file servers */
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	OP9authv4=		129,	/* plan9 auth servers */
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	/* plan9 vendor info options, textual addresses, thus v4 or v6 */
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	OP9fs=			130,	/* plan9 file servers */
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	OP9auth=		131,	/* plan9 auth servers */
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	OP9ipaddr=		132,	/* client's address */
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	OP9ipmask=		133,	/* client's subnet mask */
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	OP9ipgw=		134,	/* client's gateway */
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/*	OP9dns=			135,	/* dns servers */
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};
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/* a lease that never expires */
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#define Lforever	~0UL
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/* dhcp states */
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enum {
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	Sinit,
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	Sselecting,
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	Srequesting,
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	Sbound,
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	Srenewing,
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	Srebinding,
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};
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typedef struct Bootp	Bootp;
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struct Bootp
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{
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	/* Udphdr (included because of structure alignment on the alpha) */
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	uchar	udphdr[Udphdrsize];
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	uchar	op;			/* opcode */
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	uchar	htype;			/* hardware type */
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	uchar	hlen;			/* hardware address len */
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	uchar	hops;			/* hops */
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	uchar	xid[4];			/* a random number */
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	uchar	secs[2];		/* elapsed since client started booting */
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	uchar	flags[2];
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	uchar	ciaddr[IPv4addrlen];	/* client IP address (client tells server) */
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	uchar	yiaddr[IPv4addrlen];	/* client IP address (server tells client) */
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	uchar	siaddr[IPv4addrlen];	/* server IP address */
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	uchar	giaddr[IPv4addrlen];	/* gateway IP address */
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	uchar	chaddr[Maxhwlen];	/* client hardware address */
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	char	sname[64];		/* server host name (optional) */
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	char	file[Maxfilelen];	/* boot file name */
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	uchar	optmagic[4];
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	uchar	optdata[Maxoptlen];
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};