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#include <u.h>
2 
#include <libc.h>
3 
#include <ip.h>
4 
#include <bio.h>
5 
#include <ndb.h>
6 
#include "dat.h"
7 
 
8 
/*
9 
 *	ala rfc2131
10 
 */
11 
 
12 
enum {
13 
	Maxloglen = 1024,
14 
};
15 
 
16 
typedef struct Req Req;
17 
struct Req
18 
{
19 
	int	fd;			/* for reply */
20 
	Bootp	*bp;
21 
	Udphdr	*up;
22 
	uchar	*e;			/* end of received message */
23 
	uchar	*p;			/* options pointer */
24 
	uchar	*max;			/* max end of reply */
25 
 
26 
	/* expanded to v6 */
27 
	uchar	ciaddr[IPaddrlen];
28 
	uchar	giaddr[IPaddrlen];
29 
 
30 
	/* parsed options */
31 
	int	p9request;		/* flag: this is a bootp with plan9 options */
32 
	int	genrequest;		/* flag: this is a bootp with generic options */
33 
	int	broadcast;		/* flag: request was broadcast */
34 
	int	dhcptype;		/* dhcp message type */
35 
	int	leasetime;		/* dhcp lease */
36 
	uchar	ip[IPaddrlen];		/* requested address */
37 
	uchar	server[IPaddrlen];	/* server address */
38 
	char	msg[ERRMAX];		/* error message */
39 
	char	vci[32];		/* vendor class id */
40 
	char	*id;			/* client id */
41 
	uchar	requested[32];		/* requested params */
42 
	uchar	vendorclass[32];
43 
	char	cputype[32-3];
44 
 
45 
	Info	gii;			/* about target network */
46 
	Info	ii;			/* about target system */
47 
	int	staticbinding;
48 
 
49 
	uchar buf[2*1024];		/* message buffer */
50 
};
51 
 
52 
#define TFTP "/lib/tftpd"
53 
 
54 
char	*blog = "ipboot";
55 
char	mysysname[64];
56 
Ipifc	*ipifcs;
57 
int	debug;
58 
int	nobootp;
59 
long	now;
60 
int	slowstat, slowdyn;
61 
char	net[256];
62 
 
63 
int	pptponly;	/* only answer request that came from the pptp server */
64 
int	mute, mutestat;
65 
int	minlease = MinLease;
66 
int	staticlease = StaticLease;
67 
 
68 
uvlong	start;
69 
 
70 
static int v6opts;
71 
 
72 
/* option magic */
73 
char plan9opt[4] = { 'p', '9', ' ', ' ' };
74 
char genericopt[4] = { 0x63, 0x82, 0x53, 0x63 };
75 
 
76 
/* well known addresses */
77 
uchar zeros[Maxhwlen];
78 
 
79 
/* option debug buffer */
80 
char optbuf[1024];
81 
char *op;
82 
char *oe = optbuf + sizeof(optbuf);
83 
 
84 
char *optname[256] =
85 
{
86 
[OBend]			"end",
87 
[OBpad]			"pad",
88 
[OBmask]		"mask",
89 
[OBtimeoff]		"timeoff",
90 
[OBrouter]		"router",
91 
[OBtimeserver]		"time",
92 
[OBnameserver]		"name",
93 
[OBdnserver]		"dns",
94 
[OBlogserver]		"log",
95 
[OBcookieserver]	"cookie",
96 
[OBlprserver]		"lpr",
97 
[OBimpressserver]	"impress",
98 
[OBrlserver]		"rl",
99 
[OBhostname]		"host",
100 
[OBbflen]		"bflen",
101 
[OBdumpfile]		"dumpfile",
102 
[OBdomainname]		"dom",
103 
[OBswapserver]		"swap",
104 
[OBrootpath]		"rootpath",
105 
[OBextpath]		"extpath",
106 
[OBipforward]		"ipforward",
107 
[OBnonlocal]		"nonlocal",
108 
[OBpolicyfilter]	"policyfilter",
109 
[OBmaxdatagram]		"maxdatagram",
110 
[OBttl]			"ttl",
111 
[OBpathtimeout]		"pathtimeout",
112 
[OBpathplateau]		"pathplateau",
113 
[OBmtu]			"mtu",
114 
[OBsubnetslocal]	"subnetslocal",
115 
[OBbaddr]		"baddr",
116 
[OBdiscovermask]	"discovermask",
117 
[OBsupplymask]		"supplymask",
118 
[OBdiscoverrouter]	"discoverrouter",
119 
[OBrsserver]		"rsserver",
120 
[OBstaticroutes]	"staticroutes",
121 
[OBtrailerencap]	"trailerencap",
122 
[OBarptimeout]		"arptimeout",
123 
[OBetherencap]		"etherencap",
124 
[OBtcpttl]		"tcpttl",
125 
[OBtcpka]		"tcpka",
126 
[OBtcpkag]		"tcpkag",
127 
[OBnisdomain]		"nisdomain",
128 
[OBniserver]		"niserver",
129 
[OBntpserver]		"ntpserver",
130 
[OBvendorinfo]		"vendorinfo",
131 
[OBnetbiosns]		"NBns",
132 
[OBnetbiosdds]		"NBdds",
133 
[OBnetbiostype]		"NBtype",
134 
[OBnetbiosscope]	"NBscope",
135 
[OBxfontserver]		"xfont",
136 
[OBxdispmanager]	"xdisp",
137 
[OBnisplusdomain]	"NPdomain",
138 
[OBnisplusserver]	"NP",
139 
[OBhomeagent]		"homeagent",
140 
[OBsmtpserver]		"smtp",
141 
[OBpop3server]		"pop3",
142 
[OBnntpserver]		"nntp",
143 
[OBwwwserver]		"www",
144 
[OBfingerserver]	"finger",
145 
[OBircserver]		"ircserver",
146 
[OBstserver]		"stserver",
147 
[OBstdaserver]		"stdaserver",
148 
 
149 
/* dhcp options */
150 
[ODipaddr]		"ip",
151 
[ODlease]		"leas",
152 
[ODoverload]		"overload",
153 
[ODtype]		"typ",
154 
[ODserverid]		"sid",
155 
[ODparams]		"params",
156 
[ODmessage]		"message",
157 
[ODmaxmsg]		"maxmsg",
158 
[ODrenewaltime]		"renewaltime",
159 
[ODrebindingtime]	"rebindingtime",
160 
[ODvendorclass]		"vendorclass",
161 
[ODclientid]		"cid",
162 
[ODtftpserver]		"tftpserver",
163 
[ODbootfile]		"bf",
164 
};
165 
 
166 
void	addropt(Req*, int, uchar*);
167 
void	addrsopt(Req*, int, uchar**, int);
168 
void	arpenter(uchar*, uchar*);
169 
void	bootp(Req*);
170 
void	byteopt(Req*, int, uchar);
171 
void	dhcp(Req*);
172 
void	fatal(int, char*, ...);
173 
void	hexopt(Req*, int, char*);
174 
void	logdhcp(Req*);
175 
void	logdhcpout(Req *, char *);
176 
void	longopt(Req*, int, long);
177 
void	maskopt(Req*, int, uchar*);
178 
void	miscoptions(Req*, uchar*);
179 
int	openlisten(char *net);
180 
void	p9addrsopt(Req *rp, int t, uchar **ip, int i);
181 
void	parseoptions(Req*);
182 
void	proto(Req*, int);
183 
void	rcvdecline(Req*);
184 
void	rcvdiscover(Req*);
185 
void	rcvinform(Req*);
186 
void	rcvrelease(Req*);
187 
void	rcvrequest(Req*);
188 
int	readlast(int, uchar*, int);
189 
char*	readsysname(void);
190 
void	remrequested(Req*, int);
191 
void	sendack(Req*, uchar*, int, int);
192 
void	sendnak(Req*, char*);
193 
void	sendoffer(Req*, uchar*, int);
194 
void	stringopt(Req*, int, char*);
195 
void	termopt(Req*);
196 
int	validip(uchar*);
197 
void	vectoropt(Req*, int, uchar*, int);
198 
void	warning(int, char*, ...);
199 
 
200 
void
201 
timestamp(char *tag)
202 
{
203 
	uvlong t;
204 
 
205 
	t = nsec()/1000;
206 
	syslog(0, blog, "%s %lludµs", tag, t - start);
207 
}
208 
 
209 
void
210 
usage(void)
211 
{
212 
	fprint(2, "usage: dhcp [-dmnprsSZ] [-f directory] [-M minlease] "
213 
		"[-x netmtpt] [-Z staticlease] addr n [addr n] ...\n");
214 
	exits("usage");
215 
}
216 
 
217 
void
218 
main(int argc, char **argv)
219 
{
220 
	int i, n, fd;
221 
	uchar ip[IPaddrlen];
222 
	Req r;
223 
 
224 
	setnetmtpt(net, sizeof net, nil);
225 
 
226 
	fmtinstall('E', eipfmt);
227 
	fmtinstall('I', eipfmt);
228 
	fmtinstall('V', eipfmt);
229 
	fmtinstall('M', eipfmt);
230 
	ARGBEGIN {
231 
	case '6':
232 
		v6opts = 1;
233 
		break;
234 
	case 'd':
235 
		debug = 1;
236 
		break;
237 
	case 'f':
238 
		ndbfile = EARGF(usage());
239 
		break;
240 
	case 'm':
241 
		mute = 1;
242 
		break;
243 
	case 'M':
244 
		minlease = atoi(EARGF(usage()));
245 
		if(minlease <= 0)
246 
			minlease = MinLease;
247 
		break;
248 
	case 'n':
249 
		nobootp = 1;
250 
		break;
251 
	case 'p':
252 
		pptponly = 1;
253 
		break;
254 
	case 'r':
255 
		mutestat = 1;
256 
		break;
257 
	case 's':
258 
		slowstat = 1;
259 
		break;
260 
	case 'S':
261 
		slowdyn = 1;
262 
		break;
263 
	case 'x':
264 
		setnetmtpt(net, sizeof net, EARGF(usage()));
265 
		break;
266 
	case 'Z':
267 
		staticlease = atoi(EARGF(usage()));
268 
		if(staticlease <= 0)
269 
			staticlease = StaticLease;
270 
		break;
271 
	default:
272 
		usage();
273 
		break;
274 
	} ARGEND;
275 
 
276 
	while(argc > 1){
277 
		parseip(ip, argv[0]);
278 
		if(!validip(ip))
279 
			usage();
280 
		n = atoi(argv[1]);
281 
		if(n <= 0)
282 
			usage();
283 
		initbinding(ip, n);
284 
		argc -= 2;
285 
		argv += 2;
286 
	}
287 
 
288 
	/* for debugging */
289 
	for(i = 0; i < 256; i++)
290 
		if(optname[i] == 0)
291 
			optname[i] = smprint("%d", i);
292 
 
293 
	/* what is my name? */
294 
	strcpy(mysysname, readsysname());
295 
 
296 
	/* put process in background */
297 
	if(!debug)
298 
	switch(rfork(RFNOTEG|RFPROC|RFFDG)) {
299 
	case -1:
300 
		fatal(1, "fork");
301 
	case 0:
302 
		break;
303 
	default:
304 
		exits(0);
305 
	}
306 
 
307 
	if (chdir(TFTP) < 0)
308 
		warning(1, "can't change directory to %s", TFTP);
309 
	fd = openlisten(net);
310 
 
311 
	for(;;){
312 
		memset(&r, 0, sizeof(r));
313 
		r.fd = fd;
314 
		n = readlast(r.fd, r.buf, sizeof(r.buf));
315 
		if(n < Udphdrsize)
316 
			fatal(1, "error reading requests");
317 
		start = nsec()/1000;
318 
		op = optbuf;
319 
		*op = 0;
320 
		proto(&r, n);
321 
		if(r.id != nil)
322 
			free(r.id);
323 
	}
324 
}
325 
 
326 
void
327 
proto(Req *rp, int n)
328 
{
329 
	uchar relip[IPaddrlen];
330 
	char buf[64];
331 
 
332 
	now = time(0);
333 
 
334 
	rp->e = rp->buf + n;
335 
	rp->bp = (Bootp*)rp->buf;
336 
	rp->up = (Udphdr*)rp->buf;
337 
	if (ipcmp(rp->up->laddr, IPv4bcast) == 0){
338 
		ipmove(rp->up->laddr, rp->up->ifcaddr);
339 
		rp->broadcast = 1;
340 
	}
341 
	rp->max = rp->buf + Udphdrsize + MINSUPPORTED - IPUDPHDRSIZE;
342 
	rp->p = rp->bp->optdata;
343 
	v4tov6(rp->giaddr, rp->bp->giaddr);
344 
	v4tov6(rp->ciaddr, rp->bp->ciaddr);
345 
 
346 
	if(pptponly && rp->bp->htype != 0)
347 
		return;
348 
 
349 
	ipifcs = readipifc(net, ipifcs, -1);
350 
	if(validip(rp->giaddr))
351 
		ipmove(relip, rp->giaddr);
352 
	else if(validip(rp->up->raddr))
353 
		ipmove(relip, rp->up->raddr);
354 
	else
355 
		ipmove(relip, rp->up->laddr);
356 
	if(rp->e < (uchar*)rp->bp->sname){
357 
		warning(0, "packet too short");
358 
		return;
359 
	}
360 
	if(rp->bp->op != Bootrequest){
361 
		warning(0, "not bootrequest");
362 
		return;
363 
	}
364 
 
365 
	if(rp->e >= rp->bp->optdata){
366 
		if(memcmp(rp->bp->optmagic, plan9opt, sizeof(rp->bp->optmagic)) == 0)
367 
			rp->p9request = 1;
368 
		if(memcmp(rp->bp->optmagic, genericopt, sizeof(rp->bp->optmagic)) == 0) {
369 
			rp->genrequest = 1;
370 
			parseoptions(rp);
371 
		}
372 
	}
373 
	rp->p = rp->bp->optdata;
374 
 
375 
	/*  If no id is specified, make one from the hardware address
376 
	 *  of the target.  We assume all zeros is not a hardware address
377 
	 *  which could be a mistake.
378 
	 */
379 
	if(rp->id == nil){
380 
		if(rp->bp->hlen > Maxhwlen){
381 
			warning(0, "hlen %d", rp->bp->hlen);
382 
			return;
383 
		}
384 
		if(memcmp(zeros, rp->bp->chaddr, rp->bp->hlen) == 0){
385 
			warning(0, "no chaddr");
386 
			return;
387 
		}
388 
		sprint(buf, "hwa%2.2ux_", rp->bp->htype);
389 
		rp->id = tohex(buf, rp->bp->chaddr, rp->bp->hlen);
390 
	}
391 
 
392 
	/* info about gateway */
393 
	if(lookupip(relip, &rp->gii, 1) < 0){
394 
		warning(0, "lookupip failed");
395 
		return;
396 
	}
397 
 
398 
	/* info about target system */
399 
	if(lookup(rp->bp, &rp->ii, &rp->gii) == 0)
400 
		if(rp->ii.indb && rp->ii.dhcpgroup[0] == 0)
401 
			rp->staticbinding = 1;
402 
 
403 
	if(rp->dhcptype)
404 
		dhcp(rp);
405 
	else
406 
		bootp(rp);
407 
	timestamp("done");
408 
}
409 
 
410 
/*
411 
 * since we are single-threaded, this causes us to effectively
412 
 * stop listening while we sleep.
413 
 */
414 
static void
415 
slowdelay(Req *rp)
416 
{
417 
	if(slowstat && rp->staticbinding || slowdyn && !rp->staticbinding)
418 
		sleep(1000);
419 
}
420 
 
421 
void
422 
dhcp(Req *rp)
423 
{
424 
	logdhcp(rp);
425 
 
426 
	switch(rp->dhcptype){
427 
	case Discover:
428 
		slowdelay(rp);
429 
		rcvdiscover(rp);
430 
		break;
431 
	case Request:
432 
		rcvrequest(rp);
433 
		break;
434 
	case Decline:
435 
		rcvdecline(rp);
436 
		break;
437 
	case Release:
438 
		rcvrelease(rp);
439 
		break;
440 
	case Inform:
441 
		rcvinform(rp);
442 
		break;
443 
	}
444 
}
445 
 
446 
void
447 
rcvdiscover(Req *rp)
448 
{
449 
	Binding *b, *nb;
450 
 
451 
	if(rp->staticbinding){
452 
		sendoffer(rp, rp->ii.ipaddr, (staticlease > minlease? staticlease: minlease));
453 
		return;
454 
	}
455 
 
456 
	/*
457 
	 *  first look for an outstanding offer
458 
	 */
459 
	b = idtooffer(rp->id, &rp->gii);
460 
 
461 
	/*
462 
	 * rfc2131 says:
463 
	 *   If an address is available, the new address
464 
	 *   SHOULD be chosen as follows:
465 
	 *
466 
	 *      o The client's current address as recorded in the client's current
467 
	 *        binding, ELSE
468 
	 *
469 
	 *      o The client's previous address as recorded in the client's (now
470 
	 *        expired or released) binding, if that address is in the server's
471 
	 *        pool of available addresses and not already allocated, ELSE
472 
	 *
473 
	 *      o The address requested in the 'Requested IP Address' option, if that
474 
	 *        address is valid and not already allocated, ELSE
475 
	 *
476 
	 *      o A new address allocated from the server's pool of available
477 
	 *        addresses; the address is selected based on the subnet from which
478 
	 *        the message was received (if 'giaddr' is 0) or on the address of
479 
	 *        the relay agent that forwarded the message ('giaddr' when not 0).
480 
	 */
481 
	if(b == nil){
482 
		b = idtobinding(rp->id, &rp->gii, 1);
483 
		if(b && b->boundto && strcmp(b->boundto, rp->id) != 0)
484 
		if(validip(rp->ip) && samenet(rp->ip, &rp->gii)){
485 
			nb = iptobinding(rp->ip, 0);
486 
			if(nb && nb->lease < now)
487 
				b = nb;
488 
		}
489 
	}
490 
	if(b == nil){
491 
		warning(0, "!Discover(%s via %I): no binding %I",
492 
			rp->id, rp->gii.ipaddr, rp->ip);
493 
		return;
494 
	}
495 
	mkoffer(b, rp->id, rp->leasetime);
496 
	sendoffer(rp, b->ip, b->offer);
497 
}
498 
 
499 
void
500 
rcvrequest(Req *rp)
501 
{
502 
	Binding *b;
503 
 
504 
	if(validip(rp->server)){
505 
		/* this is a reply to an offer - SELECTING */
506 
 
507 
		/* check for hard assignment */
508 
		if(rp->staticbinding){
509 
			if(forme(rp->server))
510 
				sendack(rp, rp->ii.ipaddr,
511 
					(staticlease > minlease? staticlease:
512 
					minlease), 1);
513 
			else
514 
				warning(0, "!Request(%s via %I): for server %I not me",
515 
					rp->id, rp->gii.ipaddr, rp->server);
516 
			return;
517 
		}
518 
 
519 
		b = idtooffer(rp->id, &rp->gii);
520 
 
521 
		/* if we don't have an offer, nak */
522 
		if(b == nil){
523 
			warning(0, "!Request(%s via %I): no offer",
524 
				rp->id, rp->gii.ipaddr);
525 
			if(forme(rp->server))
526 
				sendnak(rp, "no offer for you");
527 
			return;
528 
		}
529 
 
530 
		/* if not for me, retract offer */
531 
		if(!forme(rp->server)){
532 
			b->expoffer = 0;
533 
			warning(0, "!Request(%s via %I): for server %I not me",
534 
				rp->id, rp->gii.ipaddr, rp->server);
535 
			return;
536 
		}
537 
 
538 
		/*
539 
		 *  if the client is confused about what we offered, nak.
540 
		 *  client really shouldn't be specifying this when selecting
541 
		 */
542 
		if(validip(rp->ip) && ipcmp(rp->ip, b->ip) != 0){
543 
			warning(0, "!Request(%s via %I): requests %I, not %I",
544 
				rp->id, rp->gii.ipaddr, rp->ip, b->ip);
545 
			sendnak(rp, "bad ip address option");
546 
			return;
547 
		}
548 
		if(commitbinding(b) < 0){
549 
			warning(0, "!Request(%s via %I): can't commit %I",
550 
				rp->id, rp->gii.ipaddr, b->ip);
551 
			sendnak(rp, "can't commit binding");
552 
			return;
553 
		}
554 
		sendack(rp, b->ip, b->offer, 1);
555 
	} else if(validip(rp->ip)){
556 
		/*
557 
		 *  checking address/net - INIT-REBOOT
558 
		 *
559 
		 *  This is a rebooting client that remembers its old
560 
		 *  address.
561 
		 */
562 
		/* check for hard assignment */
563 
		if(rp->staticbinding){
564 
			if(memcmp(rp->ip, rp->ii.ipaddr, IPaddrlen) != 0){
565 
				warning(0, "!Request(%s via %I): %I not valid for %E",
566 
					rp->id, rp->gii.ipaddr, rp->ip, rp->bp->chaddr);
567 
				sendnak(rp, "not valid");
568 
			}
569 
			sendack(rp, rp->ii.ipaddr, (staticlease > minlease?
570 
				staticlease: minlease), 1);
571 
			return;
572 
		}
573 
 
574 
		/* make sure the network makes sense */
575 
		if(!samenet(rp->ip, &rp->gii)){
576 
			warning(0, "!Request(%s via %I): bad forward of %I",
577 
				rp->id, rp->gii.ipaddr, rp->ip);
578 
			sendnak(rp, "wrong network");
579 
			return;
580 
		}
581 
		b = iptobinding(rp->ip, 0);
582 
		if(b == nil){
583 
			warning(0, "!Request(%s via %I): no binding for %I",
584 
				rp->id, rp->gii.ipaddr, rp->ip);
585 
			return;
586 
		}
587 
		if(memcmp(rp->ip, b->ip, IPaddrlen) != 0 || now > b->lease){
588 
			warning(0, "!Request(%s via %I): %I not valid",
589 
				rp->id, rp->gii.ipaddr, rp->ip);
590 
			sendnak(rp, "not valid");
591 
			return;
592 
		}
593 
		b->offer = b->lease - now;
594 
		sendack(rp, b->ip, b->offer, 1);
595 
	} else if(validip(rp->ciaddr)){
596 
		/*
597 
		 *  checking address - RENEWING or REBINDING
598 
		 *
599 
		 *  these states are indistinguishable in our action.  The only
600 
		 *  difference is how close to lease expiration the client is.
601 
		 *  If it is really close, it broadcasts the request hoping that
602 
		 *  some server will answer.
603 
		 */
604 
 
605 
		/* check for hard assignment */
606 
		if(rp->staticbinding){
607 
			if(ipcmp(rp->ciaddr, rp->ii.ipaddr) != 0){
608 
				warning(0, "!Request(%s via %I): %I not valid",
609 
					rp->id, rp->gii.ipaddr, rp->ciaddr);
610 
				sendnak(rp, "not valid");
611 
			}
612 
			sendack(rp, rp->ii.ipaddr, (staticlease > minlease?
613 
				staticlease: minlease), 1);
614 
			return;
615 
		}
616 
 
617 
		/* make sure the network makes sense */
618 
		if(!samenet(rp->ciaddr, &rp->gii)){
619 
			warning(0, "!Request(%s via %I): bad forward of %I",
620 
				rp->id, rp->gii.ipaddr, rp->ip);
621 
			sendnak(rp, "wrong network");
622 
			return;
623 
		}
624 
		b = iptobinding(rp->ciaddr, 0);
625 
		if(b == nil){
626 
			warning(0, "!Request(%s via %I): no binding for %I",
627 
				rp->id, rp->gii.ipaddr, rp->ciaddr);
628 
			return;
629 
		}
630 
		if(ipcmp(rp->ciaddr, b->ip) != 0){
631 
			warning(0, "!Request(%I via %s): %I not valid",
632 
				rp->id, rp->gii.ipaddr, rp->ciaddr);
633 
			sendnak(rp, "invalid ip address");
634 
			return;
635 
		}
636 
		mkoffer(b, rp->id, rp->leasetime);
637 
		if(commitbinding(b) < 0){
638 
			warning(0, "!Request(%s via %I): can't commit %I",
639 
				rp->id, rp->gii.ipaddr, b->ip);
640 
			sendnak(rp, "can't commit binding");
641 
			return;
642 
		}
643 
		sendack(rp, b->ip, b->offer, 1);
644 
	}
645 
}
646 
 
647 
void
648 
rcvdecline(Req *rp)
649 
{
650 
	Binding *b;
651 
	char buf[64];
652 
 
653 
	if(rp->staticbinding)
654 
		return;
655 
 
656 
	b = idtooffer(rp->id, &rp->gii);
657 
	if(b == nil){
658 
		warning(0, "!Decline(%s via %I): no binding",
659 
			rp->id, rp->gii.ipaddr);
660 
		return;
661 
	}
662 
 
663 
	/* mark ip address as in use */
664 
	snprint(buf, sizeof(buf), "declined by %s", rp->id);
665 
	mkoffer(b, buf, 0x7fffffff);
666 
	commitbinding(b);
667 
}
668 
 
669 
void
670 
rcvrelease(Req *rp)
671 
{
672 
	Binding *b;
673 
 
674 
	if(rp->staticbinding)
675 
		return;
676 
 
677 
	b = idtobinding(rp->id, &rp->gii, 0);
678 
	if(b == nil){
679 
		warning(0, "!Release(%s via %I): no binding",
680 
			rp->id, rp->gii.ipaddr);
681 
		return;
682 
	}
683 
	if(strcmp(rp->id, b->boundto) != 0){
684 
		warning(0, "!Release(%s via %I): invalid release of %I",
685 
			rp->id, rp->gii.ipaddr, rp->ip);
686 
		return;
687 
	}
688 
	warning(0, "Release(%s via %I): releasing %I", b->boundto, rp->gii.ipaddr, b->ip);
689 
	if(releasebinding(b, rp->id) < 0)
690 
		warning(0, "release: couldn't release");
691 
}
692 
 
693 
void
694 
rcvinform(Req *rp)
695 
{
696 
	Binding *b;
697 
 
698 
	if(rp->staticbinding){
699 
		sendack(rp, rp->ii.ipaddr, 0, 0);
700 
		return;
701 
	}
702 
 
703 
	b = iptobinding(rp->ciaddr, 0);
704 
	if(b == nil){
705 
		warning(0, "!Inform(%s via %I): no binding for %I",
706 
			rp->id, rp->gii.ipaddr, rp->ip);
707 
		return;
708 
	}
709 
	sendack(rp, b->ip, 0, 0);
710 
}
711 
 
712 
int
713 
setsiaddr(uchar *siaddr, uchar *saddr, uchar *laddr)
714 
{
715 
	if(ipcmp(saddr, IPnoaddr) != 0){
716 
		v6tov4(siaddr, saddr);
717 
		return 0;
718 
	} else {
719 
		v6tov4(siaddr, laddr);
720 
		return 1;
721 
	}
722 
}
723 
 
724 
int
725 
ismuted(Req *rp)
726 
{
727 
	return mute || (mutestat && rp->staticbinding);
728 
}
729 
 
730 
void
731 
sendoffer(Req *rp, uchar *ip, int offer)
732 
{
733 
	int n;
734 
	ushort flags;
735 
	Bootp *bp;
736 
	Udphdr *up;
737 
 
738 
	bp = rp->bp;
739 
	up = rp->up;
740 
 
741 
	/*
742 
	 *  set destination
743 
	 */
744 
	flags = nhgets(bp->flags);
745 
	if(validip(rp->giaddr)){
746 
		ipmove(up->raddr, rp->giaddr);
747 
		hnputs(up->rport, 67);
748 
	} else if(flags & Fbroadcast){
749 
		ipmove(up->raddr, IPv4bcast);
750 
		hnputs(up->rport, 68);
751 
	} else {
752 
		ipmove(up->raddr, ip);
753 
		if(bp->htype == 1)
754 
			arpenter(up->raddr, bp->chaddr);
755 
		hnputs(up->rport, 68);
756 
	}
757 
 
758 
	/*
759 
	 *  fill in standard bootp part
760 
	 */
761 
	bp->op = Bootreply;
762 
	bp->hops = 0;
763 
	hnputs(bp->secs, 0);
764 
	memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
765 
	v6tov4(bp->giaddr, rp->giaddr);
766 
	v6tov4(bp->yiaddr, ip);
767 
	setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
768 
	strncpy(bp->sname, mysysname, sizeof(bp->sname));
769 
	strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
770 
 
771 
	/*
772 
	 *  set options
773 
	 */
774 
	byteopt(rp, ODtype, Offer);
775 
	longopt(rp, ODlease, offer);
776 
	addropt(rp, ODserverid, up->laddr);
777 
	miscoptions(rp, ip);
778 
	termopt(rp);
779 
 
780 
	logdhcpout(rp, "Offer");
781 
 
782 
	/*
783 
	 *  send
784 
	 */
785 
	n = rp->p - rp->buf;
786 
	if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
787 
		warning(0, "offer: write failed: %r");
788 
}
789 
 
790 
void
791 
sendack(Req *rp, uchar *ip, int offer, int sendlease)
792 
{
793 
	int n;
794 
	ushort flags;
795 
	Bootp *bp;
796 
	Udphdr *up;
797 
 
798 
	bp = rp->bp;
799 
	up = rp->up;
800 
 
801 
	/*
802 
	 *  set destination
803 
	 */
804 
	flags = nhgets(bp->flags);
805 
	if(validip(rp->giaddr)){
806 
		ipmove(up->raddr, rp->giaddr);
807 
		hnputs(up->rport, 67);
808 
	} else if(flags & Fbroadcast){
809 
		ipmove(up->raddr, IPv4bcast);
810 
		hnputs(up->rport, 68);
811 
	} else {
812 
		ipmove(up->raddr, ip);
813 
		if(bp->htype == 1)
814 
			arpenter(up->raddr, bp->chaddr);
815 
		hnputs(up->rport, 68);
816 
	}
817 
 
818 
	/*
819 
	 *  fill in standard bootp part
820 
	 */
821 
	bp->op = Bootreply;
822 
	bp->hops = 0;
823 
	hnputs(bp->secs, 0);
824 
	v6tov4(bp->giaddr, rp->giaddr);
825 
	v6tov4(bp->yiaddr, ip);
826 
	setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
827 
	strncpy(bp->sname, mysysname, sizeof(bp->sname));
828 
	strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
829 
 
830 
	/*
831 
	 *  set options
832 
	 */
833 
	byteopt(rp, ODtype, Ack);
834 
	if(sendlease){
835 
		longopt(rp, ODlease, offer);
836 
	}
837 
	addropt(rp, ODserverid, up->laddr);
838 
	miscoptions(rp, ip);
839 
	termopt(rp);
840 
 
841 
	logdhcpout(rp, "Ack");
842 
 
843 
	/*
844 
	 *  send
845 
	 */
846 
	n = rp->p - rp->buf;
847 
	if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
848 
		warning(0, "ack: write failed: %r");
849 
}
850 
 
851 
void
852 
sendnak(Req *rp, char *msg)
853 
{
854 
	int n;
855 
	Bootp *bp;
856 
	Udphdr *up;
857 
 
858 
	bp = rp->bp;
859 
	up = rp->up;
860 
 
861 
	/*
862 
	 *  set destination (always broadcast)
863 
	 */
864 
	if(validip(rp->giaddr)){
865 
		ipmove(up->raddr, rp->giaddr);
866 
		hnputs(up->rport, 67);
867 
	} else {
868 
		ipmove(up->raddr, IPv4bcast);
869 
		hnputs(up->rport, 68);
870 
	}
871 
 
872 
	/*
873 
	 *  fill in standard bootp part
874 
	 */
875 
	bp->op = Bootreply;
876 
	bp->hops = 0;
877 
	hnputs(bp->secs, 0);
878 
	v6tov4(bp->giaddr, rp->giaddr);
879 
	memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
880 
	memset(bp->yiaddr, 0, sizeof(bp->yiaddr));
881 
	memset(bp->siaddr, 0, sizeof(bp->siaddr));
882 
 
883 
	/*
884 
	 *  set options
885 
	 */
886 
	byteopt(rp, ODtype, Nak);
887 
	addropt(rp, ODserverid, up->laddr);
888 
	if(msg)
889 
		stringopt(rp, ODmessage, msg);
890 
	if(strncmp(rp->id, "id", 2) == 0)
891 
		hexopt(rp, ODclientid, rp->id+2);
892 
	termopt(rp);
893 
 
894 
	logdhcpout(rp, "Nak");
895 
 
896 
	/*
897 
	 *  send nak
898 
	 */
899 
	n = rp->p - rp->buf;
900 
	if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
901 
		warning(0, "nak: write failed: %r");
902 
}
903 
 
904 
void
905 
bootp(Req *rp)
906 
{
907 
	int n;
908 
	Bootp *bp;
909 
	Udphdr *up;
910 
	ushort flags;
911 
	Iplifc *lifc;
912 
	Info *iip;
913 
 
914 
	warning(0, "bootp %s %I->%I from %s via %I, file %s %s",
915 
		rp->genrequest? "generic": (rp->p9request? "p9": ""),
916 
		rp->up->raddr, rp->up->laddr,
917 
		rp->id, rp->gii.ipaddr,
918 
		rp->bp->file, rp->broadcast? "broadcast": "unicast");
919 
 
920 
	if(nobootp)
921 
		return;
922 
 
923 
	bp = rp->bp;
924 
	up = rp->up;
925 
	iip = &rp->ii;
926 
 
927 
	if(rp->staticbinding == 0){
928 
		warning(0, "bootp from unknown %s via %I", rp->id, rp->gii.ipaddr);
929 
		return;
930 
	}
931 
 
932 
	/* ignore if not for us */
933 
	if(*bp->sname){
934 
		if(strcmp(bp->sname, mysysname) != 0){
935 
			bp->sname[20] = 0;
936 
			warning(0, "bootp for server %s", bp->sname);
937 
			return;
938 
		}
939 
	} else
940 
		slowdelay(rp);
941 
 
942 
	/* ignore if we don't know what file to load */
943 
	if(*bp->file == 0){
944 
		if(rp->genrequest && *iip->bootf2) /* if not plan 9 & have alternate file... */
945 
			strncpy(bp->file, iip->bootf2, sizeof(bp->file));
946 
		else if(*iip->bootf)
947 
			strncpy(bp->file, iip->bootf, sizeof(bp->file));
948 
		else if(*bp->sname) /* if we were asked, respond no matter what */
949 
			bp->file[0] = '\0';
950 
		else {
951 
			warning(0, "no bootfile for %I", iip->ipaddr);
952 
			return;
953 
		}
954 
	}
955 
 
956 
	/* ignore if the file is unreadable */
957 
	if((!rp->genrequest) && bp->file[0] && access(bp->file, 4) < 0){
958 
		warning(0, "inaccessible bootfile1 %s", bp->file);
959 
		return;
960 
	}
961 
 
962 
	bp->op = Bootreply;
963 
	v6tov4(bp->yiaddr, iip->ipaddr);
964 
	if(rp->p9request){
965 
		warning(0, "p9bootp: %I", iip->ipaddr);
966 
		memmove(bp->optmagic, plan9opt, 4);
967 
		if(iip->gwip == 0)
968 
			v4tov6(iip->gwip, bp->giaddr);
969 
		rp->p += sprint((char*)rp->p, "%V %I %I %I", iip->ipmask+IPv4off, iip->fsip,
970 
				iip->auip, iip->gwip);
971 
		sprint(optbuf, "%s", (char*)(bp->optmagic));
972 
	} else if(rp->genrequest){
973 
		warning(0, "genericbootp: %I", iip->ipaddr);
974 
		memmove(bp->optmagic, genericopt, 4);
975 
		miscoptions(rp, iip->ipaddr);
976 
		termopt(rp);
977 
	} else if(iip->vendor[0] != 0) {
978 
		warning(0, "bootp vendor field: %s", iip->vendor);
979 
		memset(rp->p, 0, 128-4);
980 
		rp->p += sprint((char*)bp->optmagic, "%s", iip->vendor);
981 
	} else {
982 
		memset(rp->p, 0, 128-4);
983 
		rp->p += 128-4;
984 
	}
985 
 
986 
	/*
987 
	 *  set destination
988 
	 */
989 
	flags = nhgets(bp->flags);
990 
	if(validip(rp->giaddr)){
991 
		ipmove(up->raddr, rp->giaddr);
992 
		hnputs(up->rport, 67);
993 
	} else if(flags & Fbroadcast){
994 
		ipmove(up->raddr, IPv4bcast);
995 
		hnputs(up->rport, 68);
996 
	} else {
997 
		v4tov6(up->raddr, bp->yiaddr);
998 
		if(bp->htype == 1)
999 
			arpenter(up->raddr, bp->chaddr);
1000 
		hnputs(up->rport, 68);
1001 
	}
1002 
 
1003 
	/*
1004 
	 *  select best local address if destination is directly connected
1005 
	 */
1006 
	lifc = findlifc(up->raddr);
1007 
	if(lifc)
1008 
		ipmove(up->laddr, lifc->ip);
1009 
 
1010 
	/*
1011 
	 *  our identity
1012 
	 */
1013 
	strncpy(bp->sname, mysysname, sizeof(bp->sname));
1014 
 
1015 
	/*
1016 
	 *  set tftp server
1017 
	 */
1018 
	setsiaddr(bp->siaddr, iip->tftp, up->laddr);
1019 
	if(rp->genrequest && *iip->bootf2)
1020 
		setsiaddr(bp->siaddr, iip->tftp2, up->laddr);
1021 
 
1022 
	/*
1023 
	 * RFC 1048 says that we must pad vendor field with
1024 
	 * zeros until we have a 64 byte field.
1025 
	 */
1026 
	n = rp->p - rp->bp->optdata;
1027 
	if(n < 64-4) {
1028 
		memset(rp->p, 0, (64-4)-n);
1029 
		rp->p += (64-4)-n;
1030 
	}
1031 
 
1032 
	/*
1033 
	 *  send
1034 
	 */
1035 
	n = rp->p - rp->buf;
1036 
	if(!ismuted(rp) && write(rp->fd, rp->buf, n) != n)
1037 
		warning(0, "bootp: write failed: %r");
1038 
 
1039 
	warning(0, "bootp via %I: file %s xid(%ux)flag(%ux)ci(%V)gi(%V)yi(%V)si(%V) %s",
1040 
			up->raddr, bp->file, nhgetl(bp->xid), nhgets(bp->flags),
1041 
			bp->ciaddr, bp->giaddr, bp->yiaddr, bp->siaddr,
1042 
			optbuf);
1043 
}
1044 
 
1045 
void
1046 
parseoptions(Req *rp)
1047 
{
1048 
	int n, c, code;
1049 
	uchar *o, *p;
1050 
 
1051 
	p = rp->p;
1052 
 
1053 
	while(p < rp->e){
1054 
		code = *p++;
1055 
		if(code == 255)
1056 
			break;
1057 
		if(code == 0)
1058 
			continue;
1059 
 
1060 
		/* ignore anything that's too long */
1061 
		n = *p++;
1062 
		o = p;
1063 
		p += n;
1064 
		if(p > rp->e)
1065 
			return;
1066 
 
1067 
		switch(code){
1068 
		case ODipaddr:	/* requested ip address */
1069 
			if(n == IPv4addrlen)
1070 
				v4tov6(rp->ip, o);
1071 
			break;
1072 
		case ODlease:	/* requested lease time */
1073 
			rp->leasetime = nhgetl(o);
1074 
			if(rp->leasetime > MaxLease || rp->leasetime < 0)
1075 
				rp->leasetime = MaxLease;
1076 
			break;
1077 
		case ODtype:
1078 
			c = *o;
1079 
			if(c < 10 && c > 0)
1080 
				rp->dhcptype = c;
1081 
			break;
1082 
		case ODserverid:
1083 
			if(n == IPv4addrlen)
1084 
				v4tov6(rp->server, o);
1085 
			break;
1086 
		case ODmessage:
1087 
			if(n > sizeof rp->msg-1)
1088 
				n = sizeof rp->msg-1;
1089 
			memmove(rp->msg, o, n);
1090 
			rp->msg[n] = 0;
1091 
			break;
1092 
		case ODmaxmsg:
1093 
			c = nhgets(o);
1094 
			c -= 28;
1095 
			c += Udphdrsize;
1096 
			if(c > 0)
1097 
				rp->max = rp->buf + c;
1098 
			break;
1099 
		case ODclientid:
1100 
			if(n <= 1)
1101 
				break;
1102 
			rp->id = toid( o, n);
1103 
			break;
1104 
		case ODparams:
1105 
			if(n > sizeof(rp->requested))
1106 
				n = sizeof(rp->requested);
1107 
			memmove(rp->requested, o, n);
1108 
			break;
1109 
		case ODvendorclass:
1110 
			if(n >= sizeof(rp->vendorclass))
1111 
				n = sizeof(rp->vendorclass)-1;
1112 
			memmove(rp->vendorclass, o, n);
1113 
			rp->vendorclass[n] = 0;
1114 
			if(strncmp((char*)rp->vendorclass, "p9-", 3) == 0)
1115 
				strcpy(rp->cputype, (char*)rp->vendorclass+3);
1116 
			break;
1117 
		case OBend:
1118 
			return;
1119 
		}
1120 
	}
1121 
}
1122 
 
1123 
void
1124 
remrequested(Req *rp, int opt)
1125 
{
1126 
	uchar *p;
1127 
 
1128 
	p = memchr(rp->requested, opt, sizeof(rp->requested));
1129 
	if(p != nil)
1130 
		*p = OBpad;
1131 
}
1132 
 
1133 
void
1134 
miscoptions(Req *rp, uchar *ip)
1135 
{
1136 
	int i, j, na;
1137 
	uchar x[2*IPaddrlen], vopts[Maxoptlen];
1138 
	uchar *op, *omax;
1139 
	uchar *addrs[2];
1140 
	char *p;
1141 
	char *attr[100], **a;
1142 
	Ndbtuple *t;
1143 
 
1144 
	addrs[0] = x;
1145 
	addrs[1] = x+IPaddrlen;
1146 
 
1147 
	/* always supply these */
1148 
	maskopt(rp, OBmask, rp->gii.ipmask);
1149 
	if(validip(rp->gii.gwip)){
1150 
		remrequested(rp, OBrouter);
1151 
		addropt(rp, OBrouter, rp->gii.gwip);
1152 
	} else if(validip(rp->giaddr)){
1153 
		remrequested(rp, OBrouter);
1154 
		addropt(rp, OBrouter, rp->giaddr);
1155 
	}
1156 
 
1157 
	/*
1158 
	 * OBhostname for the HP4000M switches
1159 
	 * (this causes NT to log infinite errors - tough shit)
1160 
	 */
1161 
	if(*rp->ii.domain){
1162 
		remrequested(rp, OBhostname);
1163 
		stringopt(rp, OBhostname, rp->ii.domain);
1164 
	}
1165 
	if(*rp->ii.rootpath)
1166 
		stringopt(rp, OBrootpath, rp->ii.rootpath);
1167 
 
1168 
	/* figure out what we need to lookup */
1169 
	na = 0;
1170 
	a = attr;
1171 
	if(*rp->ii.domain == 0)
1172 
		a[na++] = "dom";
1173 
	for(i = 0; i < sizeof(rp->requested); i++)
1174 
		switch(rp->requested[i]){
1175 
		case OBrouter:
1176 
			a[na++] = "@ipgw";
1177 
			break;
1178 
		case OBdnserver:
1179 
			a[na++] = "@dns";
1180 
			break;
1181 
		case OBnetbiosns:
1182 
			a[na++] = "@wins";
1183 
			break;
1184 
		case OBsmtpserver:
1185 
			a[na++] = "@smtp";
1186 
			break;
1187 
		case OBpop3server:
1188 
			a[na++] = "@pop3";
1189 
			break;
1190 
		case OBwwwserver:
1191 
			a[na++] = "@www";
1192 
			break;
1193 
		case OBntpserver:
1194 
			a[na++] = "@ntp";
1195 
			break;
1196 
		case OBtimeserver:
1197 
			a[na++] = "@time";
1198 
			break;
1199 
		}
1200 
	if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
1201 
	|| strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
1202 
		a[na++] = "@fs";
1203 
		a[na++] = "@auth";
1204 
	}
1205 
	t = lookupinfo(ip, a, na);
1206 
 
1207 
	/* lookup anything we might be missing */
1208 
	if(*rp->ii.domain == 0)
1209 
		lookupname(rp->ii.domain, t);
1210 
 
1211 
	/* add any requested ones that we know about */
1212 
	for(i = 0; i < sizeof(rp->requested); i++)
1213 
		switch(rp->requested[i]){
1214 
		case OBrouter:
1215 
			j = lookupserver("ipgw", addrs, t);
1216 
			addrsopt(rp, OBrouter, addrs, j);
1217 
			break;
1218 
		case OBdnserver:
1219 
			j = lookupserver("dns", addrs, t);
1220 
			addrsopt(rp, OBdnserver, addrs, j);
1221 
			break;
1222 
		case OBhostname:
1223 
			if(*rp->ii.domain)
1224 
				stringopt(rp, OBhostname, rp->ii.domain);
1225 
			break;
1226 
		case OBdomainname:
1227 
			p = strchr(rp->ii.domain, '.');
1228 
			if(p)
1229 
				stringopt(rp, OBdomainname, p+1);
1230 
			break;
1231 
		case OBnetbiosns:
1232 
			j = lookupserver("wins", addrs, t);
1233 
			addrsopt(rp, OBnetbiosns, addrs, j);
1234 
			break;
1235 
		case OBnetbiostype:
1236 
			/* p-node: peer to peer WINS queries */
1237 
			byteopt(rp, OBnetbiostype, 0x2);
1238 
			break;
1239 
		case OBsmtpserver:
1240 
			j = lookupserver("smtp", addrs, t);
1241 
			addrsopt(rp, OBsmtpserver, addrs, j);
1242 
			break;
1243 
		case OBpop3server:
1244 
			j = lookupserver("pop3", addrs, t);
1245 
			addrsopt(rp, OBpop3server, addrs, j);
1246 
			break;
1247 
		case OBwwwserver:
1248 
			j = lookupserver("www", addrs, t);
1249 
			addrsopt(rp, OBwwwserver, addrs, j);
1250 
			break;
1251 
		case OBntpserver:
1252 
			j = lookupserver("ntp", addrs, t);
1253 
			addrsopt(rp, OBntpserver, addrs, j);
1254 
			break;
1255 
		case OBtimeserver:
1256 
			j = lookupserver("time", addrs, t);
1257 
			addrsopt(rp, OBtimeserver, addrs, j);
1258 
			break;
1259 
		case OBttl:
1260 
			byteopt(rp, OBttl, 255);
1261 
			break;
1262 
		}
1263 
 
1264 
	/* add plan9 specific options */
1265 
	if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
1266 
	|| strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
1267 
		/* point to temporary area */
1268 
		op = rp->p;
1269 
		omax = rp->max;
1270 
		/* stash encoded options in vopts */
1271 
		rp->p = vopts;
1272 
		rp->max = vopts + sizeof(vopts) - 1;
1273 
 
1274 
		/* emit old v4 addresses first to make sure that they fit */
1275 
		addrsopt(rp, OP9fsv4, addrs, lookupserver("fs", addrs, t));
1276 
		addrsopt(rp, OP9authv4, addrs, lookupserver("auth", addrs, t));
1277 
 
1278 
		p9addrsopt(rp, OP9fs, addrs, lookupserver("fs", addrs, t));
1279 
		p9addrsopt(rp, OP9auth, addrs, lookupserver("auth", addrs, t));
1280 
		p9addrsopt(rp, OP9ipaddr, addrs, lookupserver("ip", addrs, t));
1281 
		p9addrsopt(rp, OP9ipmask, addrs, lookupserver("ipmask", addrs, t));
1282 
		p9addrsopt(rp, OP9ipgw, addrs, lookupserver("ipgw", addrs, t));
1283 
 
1284 
		/* point back to packet, encapsulate vopts into packet */
1285 
		j = rp->p - vopts;
1286 
		rp->p = op;
1287 
		rp->max = omax;
1288 
		vectoropt(rp, OBvendorinfo, vopts, j);
1289 
	}
1290 
 
1291 
	ndbfree(t);
1292 
}
1293 
 
1294 
int
1295 
openlisten(char *net)
1296 
{
1297 
	int fd, cfd;
1298 
	char data[128], devdir[40];
1299 
 
1300 
	sprint(data, "%s/udp!*!bootp", net);
1301 
	cfd = announce(data, devdir);
1302 
	if(cfd < 0)
1303 
		fatal(1, "can't announce");
1304 
	if(fprint(cfd, "headers") < 0)
1305 
		fatal(1, "can't set header mode");
1306 
 
1307 
	sprint(data, "%s/data", devdir);
1308 
	fd = open(data, ORDWR);
1309 
	if(fd < 0)
1310 
		fatal(1, "open udp data");
1311 
	return fd;
1312 
}
1313 
 
1314 
void
1315 
fatal(int syserr, char *fmt, ...)
1316 
{
1317 
	char buf[Maxloglen];
1318 
	va_list arg;
1319 
 
1320 
	va_start(arg, fmt);
1321 
	vseprint(buf, buf+sizeof(buf), fmt, arg);
1322 
	va_end(arg);
1323 
	if(syserr)
1324 
		syslog(1, blog, "%s: %r", buf);
1325 
	else
1326 
		syslog(1, blog, "%s", buf);
1327 
	exits(buf);
1328 
}
1329 
 
1330 
void
1331 
warning(int syserr, char *fmt, ...)
1332 
{
1333 
	char buf[Maxloglen];
1334 
	va_list arg;
1335 
 
1336 
	va_start(arg, fmt);
1337 
	vseprint(buf, buf+sizeof(buf), fmt, arg);
1338 
	va_end(arg);
1339 
	if(syserr){
1340 
		syslog(0, blog, "%s: %r", buf);
1341 
		if(debug)
1342 
			fprint(2, "%s: %r\n", buf);
1343 
	} else {
1344 
		syslog(0, blog, "%s", buf);
1345 
		if(debug)
1346 
			fprint(2, "%s\n", buf);
1347 
	}
1348 
}
1349 
 
1350 
char*
1351 
readsysname(void)
1352 
{
1353 
	static char name[128];
1354 
	char *p;
1355 
	int n, fd;
1356 
 
1357 
	fd = open("/dev/sysname", OREAD);
1358 
	if(fd >= 0){
1359 
		n = read(fd, name, sizeof(name)-1);
1360 
		close(fd);
1361 
		if(n > 0){
1362 
			name[n] = 0;
1363 
			return name;
1364 
		}
1365 
	}
1366 
	p = getenv("sysname");
1367 
	if(p == nil || *p == 0)
1368 
		return "unknown";
1369 
	return p;
1370 
}
1371 
 
1372 
extern int
1373 
validip(uchar *ip)
1374 
{
1375 
	if(ipcmp(ip, IPnoaddr) == 0)
1376 
		return 0;
1377 
	if(ipcmp(ip, v4prefix) == 0)
1378 
		return 0;
1379 
	return 1;
1380 
}
1381 
 
1382 
void
1383 
longopt(Req *rp, int t, long v)
1384 
{
1385 
	if(rp->p + 6 > rp->max)
1386 
		return;
1387 
	*rp->p++ = t;
1388 
	*rp->p++ = 4;
1389 
	hnputl(rp->p, v);
1390 
	rp->p += 4;
1391 
 
1392 
	op = seprint(op, oe, "%s(%ld)", optname[t], v);
1393 
}
1394 
 
1395 
void
1396 
addropt(Req *rp, int t, uchar *ip)
1397 
{
1398 
	if(rp->p + 6 > rp->max)
1399 
		return;
1400 
	if (!isv4(ip)) {
1401 
		if (debug)
1402 
			warning(0, "not a v4 %s server: %I", optname[t], ip);
1403 
		return;
1404 
	}
1405 
	*rp->p++ = t;
1406 
	*rp->p++ = 4;
1407 
	memmove(rp->p, ip+IPv4off, 4);
1408 
	rp->p += 4;
1409 
 
1410 
	op = seprint(op, oe, "%s(%I)", optname[t], ip);
1411 
}
1412 
 
1413 
void
1414 
maskopt(Req *rp, int t, uchar *ip)
1415 
{
1416 
	if(rp->p + 6 > rp->max)
1417 
		return;
1418 
	*rp->p++ = t;
1419 
	*rp->p++ = 4;
1420 
	memmove(rp->p, ip+IPv4off, 4);
1421 
	rp->p += 4;
1422 
 
1423 
	op = seprint(op, oe, "%s(%M)", optname[t], ip);
1424 
}
1425 
 
1426 
void
1427 
addrsopt(Req *rp, int t, uchar **ip, int i)
1428 
{
1429 
	int v4s, n;
1430 
 
1431 
	if(i <= 0)
1432 
		return;
1433 
	if(rp->p + 2 + 4*i > rp->max)
1434 
		return;
1435 
	v4s = 0;
1436 
	for(n = i; n-- > 0; )
1437 
		if (isv4(ip[n]))
1438 
			v4s++;
1439 
	if (v4s <= 0) {
1440 
		if (debug)
1441 
			warning(0, "no v4 %s servers", optname[t]);
1442 
		return;
1443 
	}
1444 
	*rp->p++ = t;
1445 
	*rp->p++ = 4*v4s;
1446 
	op = seprint(op, oe, " %s(", optname[t]);
1447 
	while(i-- > 0){
1448 
		if (!isv4(*ip)) {
1449 
			op = seprint(op, oe, " skipping %I ", *ip);
1450 
			continue;
1451 
		}
1452 
		v6tov4(rp->p, *ip);
1453 
		rp->p += 4;
1454 
		op = seprint(op, oe, "%I", *ip);
1455 
		ip++;
1456 
		if(i > 0)
1457 
			op = seprint(op, oe, " ");
1458 
	}
1459 
	op = seprint(op, oe, ")");
1460 
}
1461 
 
1462 
void
1463 
p9addrsopt(Req *rp, int t, uchar **ip, int i)
1464 
{
1465 
	char *pkt, *payload;
1466 
 
1467 
	if(i <= 0 || !v6opts)
1468 
		return;
1469 
	pkt = (char *)rp->p;
1470 
	*pkt++ = t;			/* option */
1471 
	pkt++;				/* fill in payload length below */
1472 
	payload = pkt;
1473 
	*pkt++ = i;			/* plan 9 address count */
1474 
	op = seprint(op, oe, " %s(", optname[t]);
1475 
	while(i-- > 0){
1476 
		pkt = seprint(pkt, (char *)rp->max, "%I", *ip);
1477 
		if ((uchar *)pkt+1 >= rp->max) {
1478 
			op = seprint(op, oe, "<out of mem1>)");
1479 
			return;
1480 
		}
1481 
		pkt++;			/* leave NUL as terminator */
1482 
		op = seprint(op, oe, "%I", *ip);
1483 
		ip++;
1484 
		if(i > 0)
1485 
			op = seprint(op, oe, " ");
1486 
	}
1487 
	if ((uchar *)pkt - rp->p > 0377) {
1488 
		op = seprint(op, oe, "<out of mem2>)");
1489 
		return;
1490 
	}
1491 
	op = seprint(op, oe, ")");
1492 
	rp->p[1] = pkt - payload;	/* payload length */
1493 
	rp->p = (uchar *)pkt;
1494 
}
1495 
 
1496 
void
1497 
byteopt(Req *rp, int t, uchar v)
1498 
{
1499 
	if(rp->p + 3 > rp->max)
1500 
		return;
1501 
	*rp->p++ = t;
1502 
	*rp->p++ = 1;
1503 
	*rp->p++ = v;
1504 
 
1505 
	op = seprint(op, oe, "%s(%d)", optname[t], v);
1506 
}
1507 
 
1508 
void
1509 
termopt(Req *rp)
1510 
{
1511 
	if(rp->p + 1 > rp->max)
1512 
		return;
1513 
	*rp->p++ = OBend;
1514 
}
1515 
 
1516 
void
1517 
stringopt(Req *rp, int t, char *str)
1518 
{
1519 
	int n;
1520 
 
1521 
	n = strlen(str);
1522 
	if(n > 255)
1523 
		n = 255;
1524 
	if(rp->p+n+2 > rp->max)
1525 
		return;
1526 
	*rp->p++ = t;
1527 
	*rp->p++ = n;
1528 
	memmove(rp->p, str, n);
1529 
	rp->p += n;
1530 
 
1531 
	op = seprint(op, oe, "%s(%s)", optname[t], str);
1532 
}
1533 
 
1534 
void
1535 
vectoropt(Req *rp, int t, uchar *v, int n)
1536 
{
1537 
	int i;
1538 
 
1539 
	if(n > 255) {
1540 
		n = 255;
1541 
		op = seprint(op, oe, "vectoropt len %d > 255 ", n);
1542 
	}
1543 
	if(rp->p+n+2 > rp->max)
1544 
		return;
1545 
	*rp->p++ = t;
1546 
	*rp->p++ = n;
1547 
	memmove(rp->p, v, n);
1548 
	rp->p += n;
1549 
 
1550 
	op = seprint(op, oe, "%s(", optname[t]);
1551 
	if(n > 0)
1552 
		op = seprint(op, oe, "%ud", v[0]);
1553 
	for(i = 1; i < n; i++)
1554 
		op = seprint(op, oe, " %ud", v[i]);
1555 
	op = seprint(op, oe, ")");
1556 
}
1557 
 
1558 
int
1559 
fromhex(int x)
1560 
{
1561 
	if(x >= '0' && x <= '9')
1562 
		return x - '0';
1563 
	return x - 'a';
1564 
}
1565 
 
1566 
void
1567 
hexopt(Req *rp, int t, char *str)
1568 
{
1569 
	int n;
1570 
 
1571 
	n = strlen(str);
1572 
	n /= 2;
1573 
	if(n > 255)
1574 
		n = 255;
1575 
	if(rp->p+n+2 > rp->max)
1576 
		return;
1577 
	*rp->p++ = t;
1578 
	*rp->p++ = n;
1579 
	while(n-- > 0){
1580 
		*rp->p++ = (fromhex(str[0])<<4)|fromhex(str[1]);
1581 
		str += 2;
1582 
	}
1583 
 
1584 
	op = seprint(op, oe, "%s(%s)", optname[t], str);
1585 
}
1586 
 
1587 
void
1588 
arpenter(uchar *ip, uchar *ether)
1589 
{
1590 
	int f;
1591 
	char buf[256];
1592 
 
1593 
	sprint(buf, "%s/arp", net);
1594 
	f = open(buf, OWRITE);
1595 
	if(f < 0){
1596 
		syslog(debug, blog, "open %s: %r", buf);
1597 
		return;
1598 
	}
1599 
	fprint(f, "add ether %I %E", ip, ether);
1600 
	close(f);
1601 
}
1602 
 
1603 
char *dhcpmsgname[] =
1604 
{
1605 
	[Discover]	"Discover",
1606 
	[Offer]		"Offer",
1607 
	[Request]	"Request",
1608 
	[Decline]	"Decline",
1609 
	[Ack]		"Ack",
1610 
	[Nak]		"Nak",
1611 
	[Release]	"Release",
1612 
	[Inform]	"Inform",
1613 
};
1614 
 
1615 
void
1616 
logdhcp(Req *rp)
1617 
{
1618 
	char buf[4096];
1619 
	char *p, *e;
1620 
	int i;
1621 
 
1622 
	p = buf;
1623 
	e = buf + sizeof(buf);
1624 
	if(rp->dhcptype > 0 && rp->dhcptype <= Inform)
1625 
		p = seprint(p, e, "%s(", dhcpmsgname[rp->dhcptype]);
1626 
	else
1627 
		p = seprint(p, e, "%d(", rp->dhcptype);
1628 
	p = seprint(p, e, "%I->%I) xid(%ux)flag(%ux)", rp->up->raddr, rp->up->laddr,
1629 
		nhgetl(rp->bp->xid), nhgets(rp->bp->flags));
1630 
	if(rp->bp->htype == 1)
1631 
		p = seprint(p, e, "ea(%E)", rp->bp->chaddr);
1632 
	if(validip(rp->ciaddr))
1633 
		p = seprint(p, e, "ci(%I)", rp->ciaddr);
1634 
	if(validip(rp->giaddr))
1635 
		p = seprint(p, e, "gi(%I)", rp->giaddr);
1636 
	if(validip(rp->ip))
1637 
		p = seprint(p, e, "ip(%I)", rp->ip);
1638 
	if(rp->id != nil)
1639 
		p = seprint(p, e, "id(%s)", rp->id);
1640 
	if(rp->leasetime)
1641 
		p = seprint(p, e, "leas(%d)", rp->leasetime);
1642 
	if(validip(rp->server))
1643 
		p = seprint(p, e, "sid(%I)", rp->server);
1644 
	p = seprint(p, e, "need(");
1645 
	for(i = 0; i < sizeof(rp->requested); i++)
1646 
		if(rp->requested[i] != 0)
1647 
			p = seprint(p, e, "%s ", optname[rp->requested[i]]);
1648 
	p = seprint(p, e, ")");
1649 
	p = seprint(p, e, " %s", rp->broadcast? "broadcast": "unicast");
1650 
	USED(p);
1651 
	syslog(0, blog, "%s", buf);
1652 
}
1653 
 
1654 
void
1655 
logdhcpout(Req *rp, char *type)
1656 
{
1657 
	syslog(0, blog, "%s(%I-%I)id(%s)ci(%V)gi(%V)yi(%V)si(%V) %s",
1658 
		type, rp->up->laddr, rp->up->raddr, rp->id,
1659 
		rp->bp->ciaddr, rp->bp->giaddr, rp->bp->yiaddr, rp->bp->siaddr, optbuf);
1660 
}
1661 
 
1662 
/*
1663 
 *  if we get behind, it's useless to try answering since the sender
1664 
 *  will probably have retransmitted with a differnt sequence number.
1665 
 *  So dump all but the last message in the queue.
1666 
 */
1667 
void
1668 
ding(void*, char *msg)
1669 
{
1670 
	if(strstr(msg, "alarm"))
1671 
		noted(NCONT);
1672 
	else
1673 
		noted(NDFLT);
1674 
}
1675 
 
1676 
int
1677 
readlast(int fd, uchar *buf, int len)
1678 
{
1679 
	int lastn, n;
1680 
 
1681 
	notify(ding);
1682 
 
1683 
	lastn = 0;
1684 
	for(;;){
1685 
		alarm(20);
1686 
		n = read(fd, buf, len);
1687 
		alarm(0);
1688 
		if(n < 0){
1689 
			if(lastn > 0)
1690 
				return lastn;
1691 
			break;
1692 
		}
1693 
		lastn = n;
1694 
	}
1695 
	return read(fd, buf, len);
1696 
}