1 
2 enum
3 {
4 	OfferTimeout=	60,		/* when an offer times out */
5 	MaxLease=	60*60,		/* longest lease for dynamic binding */
6 	MinLease=	15*60,		/* shortest lease for dynamic binding */
7 	StaticLease=	30*60,		/* lease for static binding */
8 
9 	IPUDPHDRSIZE=	28,		/* size of an IP plus UDP header */
10 	MINSUPPORTED=	576,		/* biggest IP message the client must support */
11 
12 	/* lengths of some bootp fields */
13 	Maxhwlen=	16,
14 	Maxfilelen=	128,
15 	Maxoptlen=	312-4,
16 
17 	/* bootp types */
18 	Bootrequest=	1,
19 	Bootreply= 	2,
20 
21 	/* bootp flags */
22 	Fbroadcast=	1<<15,
23 
24 	/* dhcp types */
25 	Discover=	1,
26 	Offer=		2,
27 	Request=	3,
28 	Decline=	4,
29 	Ack=		5,
30 	Nak=		6,
31 	Release=	7,
32 	Inform=		8,
33 
34 	/* bootp option types */
35 	OBend=			255,
36 	OBpad=			0,
37 	OBmask=			1,
38 	OBtimeoff=		2,
39 	OBrouter=		3,
40 	OBtimeserver=		4,
41 	OBnameserver=		5,
42 	OBdnserver=		6,
43 	OBlogserver=		7,
44 	OBcookieserver=		8,
45 	OBlprserver=		9,
46 	OBimpressserver=	10,
47 	OBrlserver=		11,
48 	OBhostname=		12,	/* 0xc0 */
49 	OBbflen=		13,
50 	OBdumpfile=		14,
51 	OBdomainname=		15,
52 	OBswapserver=		16,	/* 0x10 */
53 	OBrootpath=		17,
54 	OBextpath=		18,
55 	OBipforward=		19,
56 	OBnonlocal=		20,
57 	OBpolicyfilter=		21,
58 	OBmaxdatagram=		22,
59 	OBttl=			23,
60 	OBpathtimeout=		24,
61 	OBpathplateau=		25,
62 	OBmtu=			26,
63 	OBsubnetslocal=		27,
64 	OBbaddr=		28,
65 	OBdiscovermask=		29,
66 	OBsupplymask=		30,
67 	OBdiscoverrouter=	31,
68 	OBrsserver=		32,	/* 0x20 */
69 	OBstaticroutes=		33,
70 	OBtrailerencap=		34,
71 	OBarptimeout=		35,
72 	OBetherencap=		36,
73 	OBtcpttl=		37,
74 	OBtcpka=		38,
75 	OBtcpkag=		39,
76 	OBnisdomain=		40,
77 	OBniserver=		41,
78 	OBntpserver=		42,
79 	OBvendorinfo=		43,	/* 0x2b */
80 	OBnetbiosns=		44,
81 	OBnetbiosdds=		45,
82 	OBnetbiostype=		46,
83 	OBnetbiosscope=		47,
84 	OBxfontserver=		48,	/* 0x30 */
85 	OBxdispmanager=		49,
86 	OBnisplusdomain=	64,	/* 0x40 */
87 	OBnisplusserver=	65,
88 	OBhomeagent=		68,
89 	OBsmtpserver=		69,
90 	OBpop3server=		70,
91 	OBnntpserver=		71,
92 	OBwwwserver=		72,
93 	OBfingerserver=		73,
94 	OBircserver=		74,
95 	OBstserver=		75,
96 	OBstdaserver=		76,
97 
98 	/* dhcp options */
99 	ODipaddr=		50,	/* 0x32 */
100 	ODlease=		51,
101 	ODoverload=		52,
102 	ODtype=			53,	/* 0x35 */
103 	ODserverid=		54,	/* 0x36 */
104 	ODparams=		55,	/* 0x37 */
105 	ODmessage=		56,
106 	ODmaxmsg=		57,
107 	ODrenewaltime=		58,
108 	ODrebindingtime=	59,
109 	ODvendorclass=		60,
110 	ODclientid=		61,	/* 0x3d */
111 	ODtftpserver=		66,
112 	ODbootfile=		67,
113 
114 	/* plan9 vendor info options */
115 	OP9fs=			128,	// plan9 file servers
116 	OP9auth=		129,	// plan9 auth servers
117 };
118 
119 /* a lease that never expires */
120 #define Lforever	0xffffffffU
121 
122 /* dhcp states */
123 enum {
124 	Sinit,
125 	Sselecting,
126 	Srequesting,
127 	Sbound,
128 	Srenewing,
129 	Srebinding
130 };
131 
132 typedef struct Bootp	Bootp;
133 struct Bootp
134 {
135 	uchar	op;			/* opcode */
136 	uchar	htype;			/* hardware type */
137 	uchar	hlen;			/* hardware address len */
138 	uchar	hops;			/* hops */
139 	uchar	xid[4];			/* a random number */
140 	uchar	secs[2];		/* elapsed since client started booting */
141 	uchar	flags[2];
142 	uchar	ciaddr[IPv4addrlen];	/* client IP address (client tells server) */
143 	uchar	yiaddr[IPv4addrlen];	/* client IP address (server tells client) */
144 	uchar	siaddr[IPv4addrlen];	/* server IP address */
145 	uchar	giaddr[IPv4addrlen];	/* gateway IP address */
146 	uchar	chaddr[Maxhwlen];	/* client hardware address */
147 	char	sname[64];		/* server host name (optional) */
148 	char	file[Maxfilelen];	/* boot file name */
149 	uchar	optmagic[4];
150 	uchar	optdata[Maxoptlen];
151 };