tdhcpd.c - plan9port - [fork] Plan 9 from user space
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tdhcpd.c (33602B)
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1 #include <u.h>
2 #include <sys/socket.h>
3 #include <net/if_arp.h>
4 #include <netinet/ip.h>
5 #include <sys/ioctl.h>
6 #include <libc.h>
7 #include <ip.h>
8 #include <bio.h>
9 #include <ndb.h>
10 #include "dat.h"
11
12 int bwfd;
13 int wfd;
14
15 /* */
16 /* ala rfc2131 */
17 /* */
18
19 typedef struct Req Req;
20 struct Req
21 {
22 int fd; /* for reply */
23 Bootp *bp;
24 Udphdr uh;
25 Udphdr *up;
26 uchar *e; /* end of received message */
27 uchar *p; /* options pointer */
28 uchar *max; /* max end of reply */
29
30 /* expanded to v6 */
31 uchar ciaddr[IPaddrlen];
32 uchar giaddr[IPaddrlen];
33
34 /* parsed options */
35 int p9request; /* true if this is a bootp with plan9 options */
36 int genrequest; /* true if this is a bootp with generic options */
37 int dhcptype; /* dhcp message type */
38 int leasetime; /* dhcp lease */
39 uchar ip[IPaddrlen]; /* requested address */
40 uchar server[IPaddrlen]; /* server address */
41 char msg[ERRMAX]; /* error message */
42 char vci[32]; /* vendor class id */
43 char *id; /* client id */
44 uchar requested[32]; /* requested params */
45 uchar vendorclass[32];
46 char cputype[32-3];
47
48 Info gii; /* about target network */
49 Info ii; /* about target system */
50 int staticbinding;
51
52 uchar buf[2*1024]; /* message buffer */
53 };
54
55 #define TFTP "/lib/tftpd"
56 char *blog = "ipboot";
57 char mysysname[64];
58 Ipifc *ipifcs;
59 int debug;
60 int nobootp;
61 long now;
62 int slow;
63 char net[256];
64 uchar xmyipaddr[IPaddrlen];
65
66 int pptponly; /* only answer request that came from the pptp server */
67 int mute;
68 int minlease = MinLease;
69
70 ulong start;
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 longopt(Req*, int, long);
175 void maskopt(Req*, int, uchar*);
176 void miscoptions(Req*, uchar*);
177 int openlisten(char *net);
178 void parseoptions(Req*);
179 void proto(Req*, int);
180 void rcvdecline(Req*);
181 void rcvdiscover(Req*);
182 void rcvinform(Req*);
183 void rcvrelease(Req*);
184 void rcvrequest(Req*);
185 char* readsysname(void);
186 void remrequested(Req*, int);
187 void sendack(Req*, uchar*, int, int);
188 void sendnak(Req*, char*);
189 void sendoffer(Req*, uchar*, int);
190 void stringopt(Req*, int, char*);
191 void termopt(Req*);
192 int validip(uchar*);
193 void vectoropt(Req*, int, uchar*, int);
194 void warning(int, char*, ...);
195 void logdhcp(Req*);
196 void logdhcpout(Req *, char *);
197 int readlast(int, Udphdr*, uchar*, int);
198
199 void
200 timestamp(char *tag)
201 {
202 ulong t;
203
204 t = nsec()/1000;
205 syslog(0, blog, "%s %lud", tag, t - start);
206 }
207
208 void
209 usage(void)
210 {
211 fprint(2, "usage: dhcp [-dmsnp] [-f directory] [-x netmtpt] [-M minlease] addr n [addr n ...]\n");
212 exits("usage");
213 }
214
215 void
216 main(int argc, char **argv)
217 {
218 int i, n, fd;
219 char *p;
220 uchar ip[IPaddrlen];
221 Req r;
222
223 fmtinstall('E', eipfmt);
224 fmtinstall('I', eipfmt);
225 fmtinstall('V', eipfmt);
226 fmtinstall('M', eipfmt);
227 ARGBEGIN {
228 case 'm':
229 mute = 1;
230 break;
231 case 'd':
232 debug = 1;
233 break;
234 case 'f':
235 p = ARGF();
236 if(p == nil)
237 usage();
238 ndbfile = p;
239 break;
240 case 's':
241 slow = 1;
242 break;
243 case 'n':
244 nobootp = 1;
245 break;
246 case 'i':
247 parseip(xmyipaddr,EARGF(usage()));
248 break;
249 case 'p':
250 pptponly = 1;
251 break;
252 case 'M':
253 p = ARGF();
254 if(p == nil)
255 usage();
256 minlease = atoi(p);
257 if(minlease <= 0)
258 minlease = MinLease;
259 break;
260 } ARGEND;
261
262 while(argc > 1){
263 parseip(ip, argv[0]);
264 if(!validip(ip))
265 usage();
266 n = atoi(argv[1]);
267 if(n <= 0)
268 usage();
269 initbinding(ip, n);
270 argc -= 2;
271 argv += 2;
272 }
273
274 /* for debugging */
275 for(i = 0; i < 256; i++)
276 if(optname[i] == 0)
277 optname[i] = smprint("%d", i);
278
279 /* what is my name? */
280 p = readsysname();
281 strcpy(mysysname, p);
282
283 /* put process in background */
284 if(!debug) switch(rfork(RFNOTEG|RFPROC|RFFDG)) {
285 case -1:
286 fatal(1, "fork");
287 case 0:
288 break;
289 default:
290 exits(0);
291 }
292
293 chdir(TFTP);
294 fd = openlisten(net);
295 wfd = fd;
296 bwfd = fd;
297 #ifdef SO_BINDTODEVICE
298 if(setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, "eth0", 5) < 0)
299 print("setsockopt: %r\n");
300 #endif
301
302 for(;;){
303 memset(&r, 0, sizeof(r));
304 r.fd = fd;
305 n = readlast(fd, &r.uh, r.buf, sizeof(r.buf));
306 if(n < 0)
307 fatal(1, "error reading requests");
308 start = nsec()/1000;
309 op = optbuf;
310 *op = 0;
311 proto(&r, n);
312 if(r.id != nil)
313 free(r.id);
314 }
315 }
316
317 void
318 proto(Req *rp, int n)
319 {
320 uchar relip[IPaddrlen];
321 char buf[64];
322
323 now = time(0);
324
325 rp->e = rp->buf + n;
326 rp->bp = (Bootp*)rp->buf;
327 rp->up = &rp->uh;
328 rp->max = rp->buf + MINSUPPORTED - IPUDPHDRSIZE;
329 rp->p = rp->bp->optdata;
330 v4tov6(rp->giaddr, rp->bp->giaddr);
331 v4tov6(rp->ciaddr, rp->bp->ciaddr);
332
333 if(pptponly && rp->bp->htype != 0)
334 return;
335
336 ipifcs = readipifc(net, ipifcs, -1);
337 if(validip(rp->giaddr))
338 ipmove(relip, rp->giaddr);
339 else if(validip(rp->up->raddr))
340 ipmove(relip, rp->up->raddr);
341 else
342 ipmove(relip, xmyipaddr);
343 ipmove(rp->up->laddr, xmyipaddr);
344 if(rp->e < (uchar*)rp->bp->sname){
345 warning(0, "packet too short");
346 return;
347 }
348 if(rp->bp->op != Bootrequest){
349 warning(0, "not bootrequest");
350 return;
351 }
352
353 if(rp->e >= rp->bp->optdata){
354 if(memcmp(rp->bp->optmagic, plan9opt, sizeof(rp->bp->optmagic)) == 0)
355 rp->p9request = 1;
356 if(memcmp(rp->bp->optmagic, genericopt, sizeof(rp->bp->optmagic)) == 0) {
357 rp->genrequest = 1;
358 parseoptions(rp);
359 }
360 }
361 rp->p = rp->bp->optdata;
362
363 /* If no id is specified, make one from the hardware address
364 * of the target. We assume all zeros is not a hardware address
365 * which could be a mistake.
366 */
367 if(rp->id == nil){
368 if(rp->bp->hlen > Maxhwlen){
369 warning(0, "hlen %d", rp->bp->hlen);
370 return;
371 }
372 if(memcmp(zeros, rp->bp->chaddr, rp->bp->hlen) == 0){
373 warning(0, "no chaddr");
374 return;
375 }
376 sprint(buf, "hwa%2.2ux_", rp->bp->htype);
377 rp->id = tohex(buf, rp->bp->chaddr, rp->bp->hlen);
378 }
379
380 /* info about gateway */
381 if(lookupip(relip, &rp->gii, 1) < 0){
382 warning(0, "lookupip failed");
383 return;
384 }
385
386 /* info about target system */
387 if(lookup(rp->bp, &rp->ii, &rp->gii) == 0)
388 if(rp->ii.indb && rp->ii.dhcpgroup[0] == 0)
389 rp->staticbinding = 1;
390
391 if(rp->dhcptype)
392 dhcp(rp);
393 else
394 bootp(rp);
395 timestamp("done");
396 }
397
398 void
399 dhcp(Req *rp)
400 {
401 logdhcp(rp);
402
403 switch(rp->dhcptype){
404 case Discover:
405 if(slow)
406 sleep(500);
407 rcvdiscover(rp);
408 break;
409 case Request:
410 rcvrequest(rp);
411 break;
412 case Decline:
413 rcvdecline(rp);
414 break;
415 case Release:
416 rcvrelease(rp);
417 break;
418 case Inform:
419 rcvinform(rp);
420 break;
421 }
422 }
423
424 void
425 rcvdiscover(Req *rp)
426 {
427 Binding *b, *nb;
428
429 if(rp->staticbinding){
430 sendoffer(rp, rp->ii.ipaddr, StaticLease);
431 return;
432 }
433
434 /*
435 * first look for an outstanding offer
436 */
437 b = idtooffer(rp->id, &rp->gii);
438
439 /*
440 * rfc2131 says:
441 * If an address is available, the new address
442 * SHOULD be chosen as follows:
443 *
444 * o The client's current address as recorded in the client's current
445 * binding, ELSE
446 *
447 * o The client's previous address as recorded in the client's (now
448 * expired or released) binding, if that address is in the server's
449 * pool of available addresses and not already allocated, ELSE
450 *
451 * o The address requested in the 'Requested IP Address' option, if that
452 * address is valid and not already allocated, ELSE
453 *
454 * o A new address allocated from the server's pool of available
455 * addresses; the address is selected based on the subnet from which
456 * the message was received (if 'giaddr' is 0) or on the address of
457 * the relay agent that forwarded the message ('giaddr' when not 0).
458 */
459 if(b == nil){
460 b = idtobinding(rp->id, &rp->gii, 1);
461 if(b && b->boundto && strcmp(b->boundto, rp->id) != 0)
462 if(validip(rp->ip) && samenet(rp->ip, &rp->gii)){
463 nb = iptobinding(rp->ip, 0);
464 if(nb && nb->lease < now)
465 b = nb;
466 }
467 }
468 if(b == nil){
469 warning(0, "!Discover(%s via %I): no binding %I",
470 rp->id, rp->gii.ipaddr, rp->ip);
471 return;
472 }
473 mkoffer(b, rp->id, rp->leasetime);
474 sendoffer(rp, b->ip, b->offer);
475 }
476
477 void
478 rcvrequest(Req *rp)
479 {
480 Binding *b;
481
482 if(validip(rp->server)){
483 /* this is a reply to an offer - SELECTING */
484
485 /* check for hard assignment */
486 if(rp->staticbinding){
487 if(forme(rp->server))
488 sendack(rp, rp->ii.ipaddr, StaticLease, 1);
489 else
490 warning(0, "!Request(%s via %I): for server %I not me",
491 rp->id, rp->gii.ipaddr, rp->server);
492 return;
493 }
494
495 b = idtooffer(rp->id, &rp->gii);
496
497 /* if we don't have an offer, nak */
498 if(b == nil){
499 warning(0, "!Request(%s via %I): no offer",
500 rp->id, rp->gii.ipaddr);
501 if(forme(rp->server))
502 sendnak(rp, "no offer for you");
503 return;
504 }
505
506 /* if not for me, retract offer */
507 if(!forme(rp->server)){
508 b->expoffer = 0;
509 warning(0, "!Request(%s via %I): for server %I not me",
510 rp->id, rp->gii.ipaddr, rp->server);
511 return;
512 }
513
514 /*
515 * if the client is confused about what we offered, nak.
516 * client really shouldn't be specifying this when selecting
517 */
518 if(validip(rp->ip) && ipcmp(rp->ip, b->ip) != 0){
519 warning(0, "!Request(%s via %I): requests %I, not %I",
520 rp->id, rp->gii.ipaddr, rp->ip, b->ip);
521 sendnak(rp, "bad ip address option");
522 return;
523 }
524 if(commitbinding(b) < 0){
525 warning(0, "!Request(%s via %I): can't commit %I",
526 rp->id, rp->gii.ipaddr, b->ip);
527 sendnak(rp, "can't commit binding");
528 return;
529 }
530 sendack(rp, b->ip, b->offer, 1);
531 } else if(validip(rp->ip)){
532 /*
533 * checking address/net - INIT-REBOOT
534 *
535 * This is a rebooting client that remembers its old
536 * address.
537 */
538 /* check for hard assignment */
539 if(rp->staticbinding){
540 if(memcmp(rp->ip, rp->ii.ipaddr, IPaddrlen) != 0){
541 warning(0, "!Request(%s via %I): %I not valid for %E",
542 rp->id, rp->gii.ipaddr, rp->ip, rp->bp->chaddr);
543 sendnak(rp, "not valid");
544 }
545 sendack(rp, rp->ii.ipaddr, StaticLease, 1);
546 return;
547 }
548
549 /* make sure the network makes sense */
550 if(!samenet(rp->ip, &rp->gii)){
551 warning(0, "!Request(%s via %I): bad forward of %I",
552 rp->id, rp->gii.ipaddr, rp->ip);
553 sendnak(rp, "wrong network");
554 return;
555 }
556 b = iptobinding(rp->ip, 0);
557 if(b == nil){
558 warning(0, "!Request(%s via %I): no binding for %I for",
559 rp->id, rp->gii.ipaddr, rp->ip);
560 return;
561 }
562 if(memcmp(rp->ip, b->ip, IPaddrlen) != 0 || now > b->lease){
563 warning(0, "!Request(%s via %I): %I not valid",
564 rp->id, rp->gii.ipaddr, rp->ip);
565 sendnak(rp, "not valid");
566 return;
567 }
568 b->offer = b->lease - now;
569 sendack(rp, b->ip, b->offer, 1);
570 } else if(validip(rp->ciaddr)){
571 /*
572 * checking address - RENEWING or REBINDING
573 *
574 * these states are indistinguishable in our action. The only
575 * difference is how close to lease expiration the client is.
576 * If it is really close, it broadcasts the request hoping that
577 * some server will answer.
578 */
579
580 /* check for hard assignment */
581 if(rp->staticbinding){
582 if(ipcmp(rp->ciaddr, rp->ii.ipaddr) != 0){
583 warning(0, "!Request(%s via %I): %I not valid",
584 rp->id, rp->gii.ipaddr, rp->ciaddr);
585 sendnak(rp, "not valid");
586 }
587 sendack(rp, rp->ii.ipaddr, StaticLease, 1);
588 return;
589 }
590
591 /* make sure the network makes sense */
592 if(!samenet(rp->ciaddr, &rp->gii)){
593 warning(0, "!Request(%s via %I): bad forward of %I",
594 rp->id, rp->gii.ipaddr, rp->ip);
595 sendnak(rp, "wrong network");
596 return;
597 }
598 b = iptobinding(rp->ciaddr, 0);
599 if(b == nil){
600 warning(0, "!Request(%s via %I): no binding for %I",
601 rp->id, rp->gii.ipaddr, rp->ciaddr);
602 return;
603 }
604 if(ipcmp(rp->ciaddr, b->ip) != 0){
605 warning(0, "!Request(%I via %s): %I not valid",
606 rp->id, rp->gii.ipaddr, rp->ciaddr);
607 sendnak(rp, "invalid ip address");
608 return;
609 }
610 mkoffer(b, rp->id, rp->leasetime);
611 if(commitbinding(b) < 0){
612 warning(0, "!Request(%s via %I): can't commit %I",
613 rp->id, rp->gii.ipaddr, b->ip);
614 sendnak(rp, "can't commit binding");
615 return;
616 }
617 sendack(rp, b->ip, b->offer, 1);
618 }
619 }
620
621 void
622 rcvdecline(Req *rp)
623 {
624 Binding *b;
625 char buf[64];
626
627 if(rp->staticbinding)
628 return;
629
630 b = idtooffer(rp->id, &rp->gii);
631 if(b == nil){
632 warning(0, "!Decline(%s via %I): no binding",
633 rp->id, rp->gii.ipaddr);
634 return;
635 }
636
637 /* mark ip address as in use */
638 snprint(buf, sizeof(buf), "declined by %s", rp->id);
639 mkoffer(b, buf, 0x7fffffff);
640 commitbinding(b);
641 }
642
643 void
644 rcvrelease(Req *rp)
645 {
646 Binding *b;
647
648 if(rp->staticbinding)
649 return;
650
651 b = idtobinding(rp->id, &rp->gii, 0);
652 if(b == nil){
653 warning(0, "!Release(%s via %I): no binding",
654 rp->id, rp->gii.ipaddr);
655 return;
656 }
657 if(strcmp(rp->id, b->boundto) != 0){
658 warning(0, "!Release(%s via %I): invalid release of %I",
659 rp->id, rp->gii.ipaddr, rp->ip);
660 return;
661 }
662 warning(0, "Release(%s via %I): releasing %I", b->boundto, rp->gii.ipaddr, b->ip);
663 if(releasebinding(b, rp->id) < 0)
664 warning(0, "release: couldn't release");
665 }
666
667 void
668 rcvinform(Req *rp)
669 {
670 Binding *b;
671
672 if(rp->staticbinding){
673 sendack(rp, rp->ii.ipaddr, 0, 0);
674 return;
675 }
676
677 b = iptobinding(rp->ciaddr, 0);
678 if(b == nil){
679 warning(0, "!Inform(%s via %I): no binding for %I",
680 rp->id, rp->gii.ipaddr, rp->ip);
681 return;
682 }
683 sendack(rp, b->ip, 0, 0);
684 }
685
686 int
687 setsiaddr(uchar *siaddr, uchar *saddr, uchar *laddr)
688 {
689 if(ipcmp(saddr, IPnoaddr) != 0){
690 v6tov4(siaddr, saddr);
691 return 0;
692 } else {
693 v6tov4(siaddr, laddr);
694 return 1;
695 }
696 }
697
698 void
699 sendoffer(Req *rp, uchar *ip, int offer)
700 {
701 int n;
702 int fd;
703 ushort flags;
704 Bootp *bp;
705 Udphdr *up;
706
707 bp = rp->bp;
708 up = rp->up;
709
710 /*
711 * set destination
712 */
713 flags = nhgets(bp->flags);
714 fd = wfd;
715 if(validip(rp->giaddr)){
716 ipmove(up->raddr, rp->giaddr);
717 hnputs(up->rport, 67);
718 } else if(flags & Fbroadcast){
719 fd = bwfd;
720 ipmove(up->raddr, IPv4bcast);
721 hnputs(up->rport, 68);
722 } else {
723 ipmove(up->raddr, ip);
724 if(bp->htype == 1)
725 arpenter(up->raddr, bp->chaddr);
726 hnputs(up->rport, 68);
727 }
728
729 /*
730 * fill in standard bootp part
731 */
732 bp->op = Bootreply;
733 bp->hops = 0;
734 hnputs(bp->secs, 0);
735 memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
736 v6tov4(bp->giaddr, rp->giaddr);
737 v6tov4(bp->yiaddr, ip);
738 setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
739 strncpy(bp->sname, mysysname, sizeof(bp->sname));
740 strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
741
742 /*
743 * set options
744 */
745 byteopt(rp, ODtype, Offer);
746 longopt(rp, ODlease, offer);
747 addropt(rp, ODserverid, up->laddr);
748 miscoptions(rp, ip);
749 termopt(rp);
750
751 logdhcpout(rp, "Offer");
752
753 /*
754 * send
755 */
756 n = rp->p - rp->buf;
757 if(!mute && udpwrite(fd, rp->up, rp->buf, n) != n)
758 warning(0, "offer: write failed: %r");
759 }
760
761 void
762 sendack(Req *rp, uchar *ip, int offer, int sendlease)
763 {
764 int n, fd;
765 ushort flags;
766 Bootp *bp;
767 Udphdr *up;
768
769 bp = rp->bp;
770 up = rp->up;
771
772 /*
773 * set destination
774 */
775 fd = wfd;
776 flags = nhgets(bp->flags);
777 if(validip(rp->giaddr)){
778 ipmove(up->raddr, rp->giaddr);
779 hnputs(up->rport, 67);
780 } else if(flags & Fbroadcast){
781 fd = bwfd;
782 ipmove(up->raddr, IPv4bcast);
783 hnputs(up->rport, 68);
784 } else {
785 ipmove(up->raddr, ip);
786 if(bp->htype == 1)
787 arpenter(up->raddr, bp->chaddr);
788 hnputs(up->rport, 68);
789 }
790
791 /*
792 * fill in standard bootp part
793 */
794 bp->op = Bootreply;
795 bp->hops = 0;
796 hnputs(bp->secs, 0);
797 v6tov4(bp->giaddr, rp->giaddr);
798 v6tov4(bp->yiaddr, ip);
799 setsiaddr(bp->siaddr, rp->ii.tftp, up->laddr);
800 strncpy(bp->sname, mysysname, sizeof(bp->sname));
801 strncpy(bp->file, rp->ii.bootf, sizeof(bp->file));
802
803 /*
804 * set options
805 */
806 byteopt(rp, ODtype, Ack);
807 if(sendlease){
808 longopt(rp, ODlease, offer);
809 }
810 addropt(rp, ODserverid, up->laddr);
811 miscoptions(rp, ip);
812 termopt(rp);
813
814 logdhcpout(rp, "Ack");
815
816 /*
817 * send
818 */
819 n = rp->p - rp->buf;
820 if(!mute && udpwrite(fd, rp->up, rp->buf, n) != n)
821 warning(0, "ack: write failed: %r");
822 }
823
824 void
825 sendnak(Req *rp, char *msg)
826 {
827 int n, fd;
828 Bootp *bp;
829 Udphdr *up;
830
831 bp = rp->bp;
832 up = rp->up;
833
834 /*
835 * set destination (always broadcast)
836 */
837 fd = wfd;
838 if(validip(rp->giaddr)){
839 ipmove(up->raddr, rp->giaddr);
840 hnputs(up->rport, 67);
841 } else {
842 fd = bwfd;
843 ipmove(up->raddr, IPv4bcast);
844 hnputs(up->rport, 68);
845 }
846
847 /*
848 * fill in standard bootp part
849 */
850 bp->op = Bootreply;
851 bp->hops = 0;
852 hnputs(bp->secs, 0);
853 v6tov4(bp->giaddr, rp->giaddr);
854 memset(bp->ciaddr, 0, sizeof(bp->ciaddr));
855 memset(bp->yiaddr, 0, sizeof(bp->yiaddr));
856 memset(bp->siaddr, 0, sizeof(bp->siaddr));
857
858 /*
859 * set options
860 */
861 byteopt(rp, ODtype, Nak);
862 addropt(rp, ODserverid, up->laddr);
863 if(msg)
864 stringopt(rp, ODmessage, msg);
865 if(strncmp(rp->id, "id", 2) == 0)
866 hexopt(rp, ODclientid, rp->id+2);
867 termopt(rp);
868
869 logdhcpout(rp, "Nak");
870
871 /*
872 * send nak
873 */
874 n = rp->p - rp->buf;
875 if(!mute && udpwrite(fd, rp->up, rp->buf, n) != n)
876 warning(0, "nak: write failed: %r");
877 }
878
879 void
880 bootp(Req *rp)
881 {
882 int n, fd;
883 Bootp *bp;
884 Udphdr *up;
885 ushort flags;
886 Iplifc *lifc;
887 Info *iip;
888
889 warning(0, "bootp %s %I->%I from %s via %I, file %s",
890 rp->genrequest ? "generic" : (rp->p9request ? "p9" : ""),
891 rp->up->raddr, rp->up->laddr,
892 rp->id, rp->gii.ipaddr,
893 rp->bp->file);
894
895 if(nobootp)
896 return;
897
898 bp = rp->bp;
899 up = rp->up;
900 iip = &rp->ii;
901
902 if(rp->staticbinding == 0){
903 warning(0, "bootp from unknown %s via %I", rp->id, rp->gii.ipaddr);
904 return;
905 }
906
907 /* ignore if not for us */
908 if(*bp->sname){
909 if(strcmp(bp->sname, mysysname) != 0){
910 bp->sname[20] = 0;
911 warning(0, "bootp for server %s", bp->sname);
912 return;
913 }
914 } else if(slow)
915 sleep(500);
916
917 /* ignore if we don't know what file to load */
918 if(*bp->file == 0){
919 if(rp->genrequest && *iip->bootf2) /* if not plan 9 and we have an alternate file... */
920 strncpy(bp->file, iip->bootf2, sizeof(bp->file));
921 else if(*iip->bootf)
922 strncpy(bp->file, iip->bootf, sizeof(bp->file));
923 else if(*bp->sname) /* if we were asked, respond no matter what */
924 bp->file[0] = '\0';
925 else {
926 warning(0, "no bootfile for %I", iip->ipaddr);
927 return;
928 }
929 }
930
931 /* ignore if the file is unreadable */
932 if((!rp->genrequest) && bp->file[0] && access(bp->file, 4) < 0){
933 warning(0, "inaccessible bootfile1 %s", bp->file);
934 return;
935 }
936
937 bp->op = Bootreply;
938 v6tov4(bp->yiaddr, iip->ipaddr);
939 if(rp->p9request){
940 warning(0, "p9bootp: %I", iip->ipaddr);
941 memmove(bp->optmagic, plan9opt, 4);
942 if(iip->gwip == 0)
943 v4tov6(iip->gwip, bp->giaddr);
944 rp->p += sprint((char*)rp->p, "%V %I %I %I", iip->ipmask+IPv4off, iip->fsip,
945 iip->auip, iip->gwip);
946 sprint(optbuf, "%s", (char*)(bp->optmagic));
947 } else if(rp->genrequest){
948 warning(0, "genericbootp: %I", iip->ipaddr);
949 memmove(bp->optmagic, genericopt, 4);
950 miscoptions(rp, iip->ipaddr);
951 termopt(rp);
952 } else if(iip->vendor[0] != 0) {
953 warning(0, "bootp vendor field: %s", iip->vendor);
954 memset(rp->p, 0, 128-4);
955 rp->p += sprint((char*)bp->optmagic, "%s", iip->vendor);
956 } else {
957 memset(rp->p, 0, 128-4);
958 rp->p += 128-4;
959 }
960
961 /*
962 * set destination
963 */
964 fd = wfd;
965 flags = nhgets(bp->flags);
966 if(validip(rp->giaddr)){
967 ipmove(up->raddr, rp->giaddr);
968 hnputs(up->rport, 67);
969 } else if(flags & Fbroadcast){
970 fd = bwfd;
971 ipmove(up->raddr, IPv4bcast);
972 hnputs(up->rport, 68);
973 } else {
974 v4tov6(up->raddr, bp->yiaddr);
975 if(bp->htype == 1)
976 arpenter(up->raddr, bp->chaddr);
977 hnputs(up->rport, 68);
978 }
979
980 /*
981 * select best local address if destination is directly connected
982 */
983 lifc = findlifc(up->raddr);
984 if(lifc)
985 ipmove(up->laddr, lifc->ip);
986
987 /*
988 * our identity
989 */
990 strncpy(bp->sname, mysysname, sizeof(bp->sname));
991
992 /*
993 * set tftp server
994 */
995 setsiaddr(bp->siaddr, iip->tftp, up->laddr);
996 if(rp->genrequest && *iip->bootf2)
997 setsiaddr(bp->siaddr, iip->tftp2, up->laddr);
998
999 /*
1000 * RFC 1048 says that we must pad vendor field with
1001 * zeros until we have a 64 byte field.
1002 */
1003 n = rp->p - rp->bp->optdata;
1004 if(n < 64-4) {
1005 memset(rp->p, 0, (64-4)-n);
1006 rp->p += (64-4)-n;
1007 }
1008
1009 /*
1010 * send
1011 */
1012 n = rp->p - rp->buf;
1013 if(!mute && udpwrite(fd, rp->up, rp->buf, n) != n)
1014 warning(0, "bootp: write failed: %r");
1015
1016 warning(0, "bootp via %I: file %s xid(%ux)flag(%ux)ci(%V)gi(%V)yi(%V)si(%V) %s",
1017 up->raddr, bp->file, nhgetl(bp->xid), nhgets(bp->flags),
1018 bp->ciaddr, bp->giaddr, bp->yiaddr, bp->siaddr,
1019 optbuf);
1020 }
1021
1022 void
1023 parseoptions(Req *rp)
1024 {
1025 int n, c, code;
1026 uchar *o, *p;
1027
1028 p = rp->p;
1029
1030 while(p < rp->e){
1031 code = *p++;
1032 if(code == 255)
1033 break;
1034 if(code == 0)
1035 continue;
1036
1037 /* ignore anything that's too long */
1038 n = *p++;
1039 o = p;
1040 p += n;
1041 if(p > rp->e)
1042 return;
1043
1044 switch(code){
1045 case ODipaddr: /* requested ip address */
1046 if(n == IPv4addrlen)
1047 v4tov6(rp->ip, o);
1048 break;
1049 case ODlease: /* requested lease time */
1050 rp->leasetime = nhgetl(o);
1051 if(rp->leasetime > MaxLease || rp->leasetime < 0)
1052 rp->leasetime = MaxLease;
1053 break;
1054 case ODtype:
1055 c = *o;
1056 if(c < 10 && c > 0)
1057 rp->dhcptype = c;
1058 break;
1059 case ODserverid:
1060 if(n == IPv4addrlen)
1061 v4tov6(rp->server, o);
1062 break;
1063 case ODmessage:
1064 if(n > sizeof rp->msg-1)
1065 n = sizeof rp->msg-1;
1066 memmove(rp->msg, o, n);
1067 rp->msg[n] = 0;
1068 break;
1069 case ODmaxmsg:
1070 c = nhgets(o);
1071 c -= 28;
1072 if(c > 0)
1073 rp->max = rp->buf + c;
1074 break;
1075 case ODclientid:
1076 if(n <= 1)
1077 break;
1078 rp->id = toid( o, n);
1079 break;
1080 case ODparams:
1081 if(n > sizeof(rp->requested))
1082 n = sizeof(rp->requested);
1083 memmove(rp->requested, o, n);
1084 break;
1085 case ODvendorclass:
1086 if(n >= sizeof(rp->vendorclass))
1087 n = sizeof(rp->vendorclass)-1;
1088 memmove(rp->vendorclass, o, n);
1089 rp->vendorclass[n] = 0;
1090 if(strncmp((char*)rp->vendorclass, "p9-", 3) == 0)
1091 strcpy(rp->cputype, (char*)rp->vendorclass+3);
1092 break;
1093 case OBend:
1094 return;
1095 }
1096 }
1097 }
1098
1099 void
1100 remrequested(Req *rp, int opt)
1101 {
1102 uchar *p;
1103
1104 p = memchr(rp->requested, opt, sizeof(rp->requested));
1105 if(p != nil)
1106 *p = OBpad;
1107 }
1108
1109 void
1110 miscoptions(Req *rp, uchar *ip)
1111 {
1112 char *p;
1113 int i, j;
1114 uchar *addrs[2];
1115 uchar x[2*IPaddrlen];
1116 uchar vopts[64];
1117 uchar *op, *omax;
1118 char *attr[100], **a;
1119 int na;
1120 Ndbtuple *t;
1121
1122 addrs[0] = x;
1123 addrs[1] = x+IPaddrlen;
1124
1125 /* always supply these */
1126 maskopt(rp, OBmask, rp->gii.ipmask);
1127 if(validip(rp->gii.gwip)){
1128 remrequested(rp, OBrouter);
1129 addropt(rp, OBrouter, rp->gii.gwip);
1130 } else if(validip(rp->giaddr)){
1131 remrequested(rp, OBrouter);
1132 addropt(rp, OBrouter, rp->giaddr);
1133 }
1134
1135 /* OBhostname for the HP4000M switches */
1136 /* (this causes NT to log infinite errors - tough shit ) */
1137 if(*rp->ii.domain){
1138 remrequested(rp, OBhostname);
1139 stringopt(rp, OBhostname, rp->ii.domain);
1140 }
1141 if(*rp->ii.rootpath)
1142 stringopt(rp, OBrootpath, rp->ii.rootpath);
1143
1144 /* figure out what we need to lookup */
1145 na = 0;
1146 a = attr;
1147 if(*rp->ii.domain == 0)
1148 a[na++] = "dom";
1149 for(i = 0; i < sizeof(rp->requested); i++)
1150 switch(rp->requested[i]){
1151 case OBrouter:
1152 a[na++] = "@ipgw";
1153 break;
1154 case OBdnserver:
1155 a[na++] = "@dns";
1156 break;
1157 case OBnetbiosns:
1158 a[na++] = "@wins";
1159 break;
1160 case OBsmtpserver:
1161 a[na++] = "@smtp";
1162 break;
1163 case OBpop3server:
1164 a[na++] = "@pop3";
1165 break;
1166 case OBwwwserver:
1167 a[na++] = "@www";
1168 break;
1169 case OBntpserver:
1170 a[na++] = "@ntp";
1171 break;
1172 case OBtimeserver:
1173 a[na++] = "@time";
1174 break;
1175 }
1176 if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
1177 || strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
1178 a[na++] = "@fs";
1179 a[na++] = "@auth";
1180 }
1181 t = lookupinfo(ip, a, na);
1182
1183 /* lookup anything we might be missing */
1184 if(*rp->ii.domain == 0)
1185 lookupname(rp->ii.domain, t);
1186
1187 /* add any requested ones that we know about */
1188 for(i = 0; i < sizeof(rp->requested); i++)
1189 switch(rp->requested[i]){
1190 case OBrouter:
1191 j = lookupserver("ipgw", addrs, t);
1192 addrsopt(rp, OBrouter, addrs, j);
1193 break;
1194 case OBdnserver:
1195 j = lookupserver("dns", addrs, t);
1196 addrsopt(rp, OBdnserver, addrs, j);
1197 break;
1198 case OBhostname:
1199 if(*rp->ii.domain)
1200 stringopt(rp, OBhostname, rp->ii.domain);
1201 break;
1202 case OBdomainname:
1203 p = strchr(rp->ii.domain, '.');
1204 if(p)
1205 stringopt(rp, OBdomainname, p+1);
1206 break;
1207 case OBnetbiosns:
1208 j = lookupserver("wins", addrs, t);
1209 addrsopt(rp, OBnetbiosns, addrs, j);
1210 break;
1211 case OBnetbiostype:
1212 /* p-node: peer to peer WINS queries */
1213 byteopt(rp, OBnetbiostype, 0x2);
1214 break;
1215 case OBsmtpserver:
1216 j = lookupserver("smtp", addrs, t);
1217 addrsopt(rp, OBsmtpserver, addrs, j);
1218 break;
1219 case OBpop3server:
1220 j = lookupserver("pop3", addrs, t);
1221 addrsopt(rp, OBpop3server, addrs, j);
1222 break;
1223 case OBwwwserver:
1224 j = lookupserver("www", addrs, t);
1225 addrsopt(rp, OBwwwserver, addrs, j);
1226 break;
1227 case OBntpserver:
1228 j = lookupserver("ntp", addrs, t);
1229 addrsopt(rp, OBntpserver, addrs, j);
1230 break;
1231 case OBtimeserver:
1232 j = lookupserver("time", addrs, t);
1233 addrsopt(rp, OBtimeserver, addrs, j);
1234 break;
1235 case OBttl:
1236 byteopt(rp, OBttl, 255);
1237 break;
1238 }
1239
1240 /* add plan9 specific options */
1241 if(strncmp((char*)rp->vendorclass, "plan9_", 6) == 0
1242 || strncmp((char*)rp->vendorclass, "p9-", 3) == 0){
1243 /* point to temporary area */
1244 op = rp->p;
1245 omax = rp->max;
1246 rp->p = vopts;
1247 rp->max = vopts + sizeof(vopts) - 1;
1248
1249 j = lookupserver("fs", addrs, t);
1250 addrsopt(rp, OP9fs, addrs, j);
1251 j = lookupserver("auth", addrs, t);
1252 addrsopt(rp, OP9auth, addrs, j);
1253
1254 /* point back */
1255 j = rp->p - vopts;
1256 rp->p = op;
1257 rp->max = omax;
1258 vectoropt(rp, OBvendorinfo, vopts, j);
1259 }
1260
1261 ndbfree(t);
1262 }
1263
1264 int
1265 openlisten(char *net)
1266 {
1267 int fd;
1268 char data[128];
1269 char devdir[40];
1270 int yes;
1271
1272 sprint(data, "udp!*!bootps");
1273 fd = announce(data, devdir);
1274 if(fd < 0)
1275 fatal(1, "can't announce");
1276 yes = 1;
1277 if(setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &yes, sizeof yes) < 0)
1278 fatal(1, "can't broadcast");
1279 return fd;
1280 }
1281
1282 void
1283 fatal(int syserr, char *fmt, ...)
1284 {
1285 char buf[ERRMAX];
1286 va_list arg;
1287
1288 va_start(arg, fmt);
1289 vseprint(buf, buf+sizeof(buf), fmt, arg);
1290 va_end(arg);
1291 if(syserr)
1292 syslog(1, blog, "%s: %r", buf);
1293 else
1294 syslog(1, blog, "%s", buf);
1295 exits(buf);
1296 }
1297
1298 extern void
1299 warning(int syserr, char *fmt, ...)
1300 {
1301 char buf[256];
1302 va_list arg;
1303
1304 va_start(arg, fmt);
1305 vseprint(buf, buf+sizeof(buf), fmt, arg);
1306 va_end(arg);
1307 if(syserr){
1308 syslog(0, blog, "%s: %r", buf);
1309 if(debug)
1310 fprint(2, "%s: %r\n", buf);
1311 } else {
1312 syslog(0, blog, "%s", buf);
1313 if(debug)
1314 fprint(2, "%s\n", buf);
1315 }
1316 }
1317
1318 char*
1319 readsysname(void)
1320 {
1321 static char name[128];
1322 char *p;
1323 int n, fd;
1324
1325 fd = open("/dev/sysname", OREAD);
1326 if(fd >= 0){
1327 n = read(fd, name, sizeof(name)-1);
1328 close(fd);
1329 if(n > 0){
1330 name[n] = 0;
1331 return name;
1332 }
1333 }
1334 p = getenv("sysname");
1335 if(p == nil || *p == 0)
1336 return "unknown";
1337 return p;
1338 }
1339
1340 extern int
1341 validip(uchar *ip)
1342 {
1343 if(ipcmp(ip, IPnoaddr) == 0)
1344 return 0;
1345 if(ipcmp(ip, v4prefix) == 0)
1346 return 0;
1347 return 1;
1348 }
1349
1350 void
1351 longopt(Req *rp, int t, long v)
1352 {
1353 if(rp->p + 6 > rp->max)
1354 return;
1355 *rp->p++ = t;
1356 *rp->p++ = 4;
1357 hnputl(rp->p, v);
1358 rp->p += 4;
1359
1360 op = seprint(op, oe, "%s(%ld)", optname[t], v);
1361 }
1362
1363 void
1364 addropt(Req *rp, int t, uchar *ip)
1365 {
1366 if(rp->p + 6 > rp->max)
1367 return;
1368 *rp->p++ = t;
1369 *rp->p++ = 4;
1370 memmove(rp->p, ip+IPv4off, 4);
1371 rp->p += 4;
1372
1373 op = seprint(op, oe, "%s(%I)", optname[t], ip);
1374 }
1375
1376 void
1377 maskopt(Req *rp, int t, uchar *ip)
1378 {
1379 if(rp->p + 6 > rp->max)
1380 return;
1381 *rp->p++ = t;
1382 *rp->p++ = 4;
1383 memmove(rp->p, ip+IPv4off, 4);
1384 rp->p += 4;
1385
1386 op = seprint(op, oe, "%s(%M)", optname[t], ip);
1387 }
1388
1389 void
1390 addrsopt(Req *rp, int t, uchar **ip, int i)
1391 {
1392 if(i <= 0)
1393 return;
1394 if(rp->p + 2 + 4*i > rp->max)
1395 return;
1396 *rp->p++ = t;
1397 *rp->p++ = 4*i;
1398 op = seprint(op, oe, "%s(", optname[t]);
1399 while(i-- > 0){
1400 v6tov4(rp->p, *ip);
1401 rp->p += 4;
1402 op = seprint(op, oe, "%I", *ip);
1403 ip++;
1404 if(i > 0)
1405 op = seprint(op, oe, " ");
1406 }
1407 op = seprint(op, oe, ")");
1408 }
1409
1410 void
1411 byteopt(Req *rp, int t, uchar v)
1412 {
1413 if(rp->p + 3 > rp->max)
1414 return;
1415 *rp->p++ = t;
1416 *rp->p++ = 1;
1417 *rp->p++ = v;
1418
1419 op = seprint(op, oe, "%s(%d)", optname[t], v);
1420 }
1421
1422 void
1423 termopt(Req *rp)
1424 {
1425 if(rp->p + 1 > rp->max)
1426 return;
1427 *rp->p++ = OBend;
1428 }
1429
1430 void
1431 stringopt(Req *rp, int t, char *str)
1432 {
1433 int n;
1434
1435 n = strlen(str);
1436 if(n > 255)
1437 n = 255;
1438 if(rp->p+n+2 > rp->max)
1439 return;
1440 *rp->p++ = t;
1441 *rp->p++ = n;
1442 memmove(rp->p, str, n);
1443 rp->p += n;
1444
1445 op = seprint(op, oe, "%s(%s)", optname[t], str);
1446 }
1447
1448 void
1449 vectoropt(Req *rp, int t, uchar *v, int n)
1450 {
1451 int i;
1452
1453 if(n > 255)
1454 n = 255;
1455 if(rp->p+n+2 > rp->max)
1456 return;
1457 *rp->p++ = t;
1458 *rp->p++ = n;
1459 memmove(rp->p, v, n);
1460 rp->p += n;
1461
1462 op = seprint(op, oe, "%s(", optname[t]);
1463 if(n > 0)
1464 op = seprint(op, oe, "%ud", 0);
1465 for(i = 1; i < n; i++)
1466 op = seprint(op, oe, " %ud", v[i]);
1467 }
1468
1469 int
1470 fromhex(int x)
1471 {
1472 if(x >= '0' && x <= '9')
1473 return x - '0';
1474 return x - 'a';
1475 }
1476
1477 void
1478 hexopt(Req *rp, int t, char *str)
1479 {
1480 int n;
1481
1482 n = strlen(str);
1483 n /= 2;
1484 if(n > 255)
1485 n = 255;
1486 if(rp->p+n+2 > rp->max)
1487 return;
1488 *rp->p++ = t;
1489 *rp->p++ = n;
1490 while(n-- > 0){
1491 *rp->p++ = (fromhex(str[0])<<4)|fromhex(str[1]);
1492 str += 2;
1493 }
1494
1495 op = seprint(op, oe, "%s(%s)", optname[t], str);
1496 }
1497
1498 /*
1499 * What a crock it is to do this for real.
1500 * A giant hairy mess of ioctls that differ from
1501 * system to system. Don't get sucked in.
1502 * This need not be fast.
1503 */
1504 void
1505 arpenter(uchar *ip, uchar *ether)
1506 {
1507 int pid;
1508 char xip[100], xether[100];
1509
1510 switch(pid=fork()){
1511 case -1:
1512 break;
1513 default:
1514 waitpid();
1515 break;
1516 case 0:
1517 snprint(xip, sizeof xip, "%I", ip);
1518 snprint(xether, sizeof xether, "%#E", ether);
1519 execl("arp", "arp", "-s", xip, xether, "temp", nil);
1520 _exits("execl");
1521 }
1522 /*
1523 for comfort - ah, the good old days
1524
1525 int f;
1526 char buf[256];
1527
1528 sprint(buf, "%s/arp", net);
1529 f = open(buf, OWRITE);
1530 if(f < 0){
1531 syslog(debug, blog, "open %s: %r", buf);
1532 return;
1533 }
1534 fprint(f, "add ether %I %E", ip, ether);
1535 close(f);
1536 */
1537 }
1538
1539 char *dhcpmsgname[] =
1540 {
1541 [Discover] "Discover",
1542 [Offer] "Offer",
1543 [Request] "Request",
1544 [Decline] "Decline",
1545 [Ack] "Ack",
1546 [Nak] "Nak",
1547 [Release] "Release",
1548 [Inform] "Inform"
1549 };
1550
1551 void
1552 logdhcp(Req *rp)
1553 {
1554 char buf[4096];
1555 char *p, *e;
1556 int i;
1557
1558 p = buf;
1559 e = buf + sizeof(buf);
1560 if(rp->dhcptype > 0 && rp->dhcptype <= Inform)
1561 p = seprint(p, e, "%s(", dhcpmsgname[rp->dhcptype]);
1562 else
1563 p = seprint(p, e, "%d(", rp->dhcptype);
1564 p = seprint(p, e, "%I->%I) xid(%ux)flag(%ux)", rp->up->raddr, rp->up->laddr,
1565 nhgetl(rp->bp->xid), nhgets(rp->bp->flags));
1566 if(rp->bp->htype == 1)
1567 p = seprint(p, e, "ea(%E)", rp->bp->chaddr);
1568 if(validip(rp->ciaddr))
1569 p = seprint(p, e, "ci(%I)", rp->ciaddr);
1570 if(validip(rp->giaddr))
1571 p = seprint(p, e, "gi(%I)", rp->giaddr);
1572 if(validip(rp->ip))
1573 p = seprint(p, e, "ip(%I)", rp->ip);
1574 if(rp->id != nil)
1575 p = seprint(p, e, "id(%s)", rp->id);
1576 if(rp->leasetime)
1577 p = seprint(p, e, "leas(%d)", rp->leasetime);
1578 if(validip(rp->server))
1579 p = seprint(p, e, "sid(%I)", rp->server);
1580 p = seprint(p, e, "need(");
1581 for(i = 0; i < sizeof(rp->requested); i++)
1582 if(rp->requested[i] != 0)
1583 p = seprint(p, e, "%s ", optname[rp->requested[i]]);
1584 p = seprint(p, e, ")");
1585
1586 USED(p);
1587 syslog(0, blog, "%s", buf);
1588 }
1589
1590 void
1591 logdhcpout(Req *rp, char *type)
1592 {
1593 syslog(0, blog, "%s(%I->%I)id(%s)ci(%V)gi(%V)yi(%V)si(%V) %s",
1594 type, rp->up->laddr, rp->up->raddr, rp->id,
1595 rp->bp->ciaddr, rp->bp->giaddr, rp->bp->yiaddr, rp->bp->siaddr, optbuf);
1596 }
1597
1598 /*
1599 * if we get behind, it's useless to try answering since the sender
1600 * will probably have retransmitted with a differnt sequence number.
1601 * So dump all the last message in the queue.
1602 */
1603 void ding(void *x, char *msg)
1604 {
1605 USED(x);
1606
1607 if(strstr(msg, "alarm"))
1608 noted(NCONT);
1609 else
1610 noted(NDFLT);
1611 }
1612
1613 int
1614 readlast(int fd, Udphdr *hdr, uchar *buf, int len)
1615 {
1616 int lastn, n;
1617
1618 notify(ding);
1619
1620 lastn = 0;
1621 for(;;){
1622 alarm(20);
1623 n = udpread(fd, hdr, buf, len);
1624 alarm(0);
1625 if(n < 0){
1626 if(lastn > 0)
1627 return lastn;
1628 break;
1629 }
1630 lastn = n;
1631 }
1632 return udpread(fd, hdr, buf, len);
1633 }