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WebSVN – planix.SVN – Blame – /os/branches/feature_unix/sys/src/cmd/ip/snoopy/bootp.c – Rev 2

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#include <u.h>
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#include <libc.h>
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#include <ip.h>
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#include "dat.h"
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#include "protos.h"
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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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};
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typedef struct Hdr	Hdr;
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struct Hdr
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{
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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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};
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enum
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{
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	Oca,
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	Osa,
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	Ot,
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};
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static Field p_fields[] =
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{
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	{"ca",		Fv4ip,	Oca,	"client IP addr",	} ,
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	{"sa",		Fv4ip,	Osa,	"server IP addr",	} ,
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	{0}
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};
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#define plan9opt ((ulong)(('p'<<24) | ('9'<<16) | (' '<<8) | ' '))
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#define genericopt (0x63825363UL)
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static Mux p_mux[] =
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{
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	{"dhcp", 	genericopt,},
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	{"plan9bootp",	plan9opt,},
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	{"dump",	0,},
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	{0}
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};
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static void
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p_compile(Filter *f)
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{
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	Mux *m;
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	if(f->op == '='){
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		compile_cmp(bootp.name, f, p_fields);
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		return;
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	}
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	for(m = p_mux; m->name != nil; m++)
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		if(strcmp(f->s, m->name) == 0){
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			f->pr = m->pr;
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			f->ulv = m->val;
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			f->subop = Ot;
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			return;
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		}
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	sysfatal("unknown bootp field: %s", f->s);
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}
94 
 
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static int
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p_filter(Filter *f, Msg *m)
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{
98 
	Hdr *h;
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	h = (Hdr*)m->ps;
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102 
	if(m->pe < (uchar*)h->sname)
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		return 0;
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	m->ps = h->optdata;
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	switch(f->subop){
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	case Oca:
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		return NetL(h->ciaddr) == f->ulv || NetL(h->yiaddr) == f->ulv;
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	case Osa:
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		return NetL(h->siaddr) == f->ulv;
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	case Ot:
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		return NetL(h->optmagic) == f->ulv;
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	}
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	return 0;
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}
116 
 
117 
static char*
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op(int i)
119 
{
120 
	static char x[20];
121 
 
122 
	switch(i){
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	case Bootrequest:
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		return "Req";
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	case Bootreply:
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		return "Rep";
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	default:
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		sprint(x, "%d", i);
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		return x;
130 
	}
131 
}
132 
 
133 
 
134 
static int
135 
p_seprint(Msg *m)
136 
{
137 
	Hdr *h;
138 
	ulong x;
139 
 
140 
	h = (Hdr*)m->ps;
141 
 
142 
	if(m->pe < (uchar*)h->sname)
143 
		return -1;
144 
 
145 
	/* point past data */
146 
	m->ps = h->optdata;
147 
 
148 
	/* next protocol */
149 
	m->pr = nil;
150 
	if(m->pe >= (uchar*)h->optdata){
151 
		x = NetL(h->optmagic);
152 
		demux(p_mux, x, x, m, &dump);
153 
	}
154 
 
155 
	m->p = seprint(m->p, m->e, "t=%s ht=%d hl=%d hp=%d xid=%ux sec=%d fl=%4.4ux ca=%V ya=%V sa=%V ga=%V cha=%E magic=%lux",
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		op(h->op), h->htype, h->hlen, h->hops,
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		NetL(h->xid), NetS(h->secs), NetS(h->flags),
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		h->ciaddr, h->yiaddr, h->siaddr, h->giaddr, h->chaddr,
159 
		(ulong)NetL(h->optmagic));
160 
	if(m->pe > (uchar*)h->sname && *h->sname)
161 
		m->p = seprint(m->p, m->e, " snam=%s", h->sname);
162 
	if(m->pe > (uchar*)h->file && *h->file)
163 
		m->p = seprint(m->p, m->e, " file=%s", h->file);
164 
	return 0;
165 
}
166 
 
167 
Proto bootp =
168 
{
169 
	"bootp",
170 
	p_compile,
171 
	p_filter,
172 
	p_seprint,
173 
	p_mux,
174 
	"%#.8lux",
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	p_fields,
176 
	defaultframer,
177 
};