1 enum
2 {
3 	/* RR types */
4 	Ta=	1,
5 	Tns=	2,
6 	Tmd=	3,
7 	Tmf=	4,
8 	Tcname=	5,
9 	Tsoa=	6,
10 	Tmb=	7,
11 	Tmg=	8,
12 	Tmr=	9,
13 	Tnull=	10,
14 	Twks=	11,
15 	Tptr=	12,
16 	Thinfo=	13,
17 	Tminfo=	14,
18 	Tmx=	15,
19 	Ttxt=	16,
20 	Trp=	17,
21 	Tsig=	24,
22 	Tkey=	25,
23 	Taaaa=	28,
24 	Tcert=	37,
25 
26 	/* query types (all RR types are also queries) */
27 	Tixfr=	251,	/* incremental zone transfer */
28 	Taxfr=	252,	/* zone transfer */
29 	Tmailb=	253,	/* { Tmb, Tmg, Tmr } */
30 	Tall=	255,	/* all records */
31 
32 	/* classes */
33 	Csym=	0,	/* internal symbols */
34 	Cin=	1,	/* internet */
35 	Ccs,		/* CSNET (obsolete) */
36 	Cch,		/* Chaos net */
37 	Chs,		/* Hesiod (?) */
38 
39 	/* class queries (all class types are also queries) */
40 	Call=	255,	/* all classes */
41 
42 	/* opcodes */
43 	Oquery=		0<<11,		/* normal query */
44 	Oinverse=	1<<11,		/* inverse query */
45 	Ostatus=	2<<11,		/* status request */
46 	Onotify=	4<<11,		/* notify slaves of updates */
47 	Omask=		0xf<<11,	/* mask for opcode */
48 
49 	/* response codes */
50 	Rok=		0,
51 	Rformat=	1,	/* format error */
52 	Rserver=	2,	/* server failure (e.g. no answer from something) */
53 	Rname=		3,	/* bad name */
54 	Runimplimented=	4,	/* unimplemented */
55 	Rrefused=	5,	/* we don't like you */
56 	Rmask=		0xf,	/* mask for response */
57 	Rtimeout=	0x10,	/* timeout sending (for internal use only) */
58 
59 	/* bits in flag word (other than opcode and response) */
60 	Fresp=		1<<15,	/* message is a response */
61 	Fauth=		1<<10,	/* true if an authoritative response */
62 	Ftrunc=		1<<9,	/* truncated message */
63 	Frecurse=	1<<8,	/* request recursion */
64 	Fcanrec=	1<<7,	/* server can recurse */
65 
66 	Domlen=		256,	/* max domain name length (with NULL) */
67 	Labellen=	256,	/* max domain label length (with NULL) */
68 	Strlen=		256,	/* max string length (with NULL) */
69 	Iplen=		32,	/* max ascii ip address length (with NULL) */
70 
71 	/* time to live values (in seconds) */
72 	Min=		60,
73 	Hour=		60*Min,		/* */
74 	Day=		24*Hour,	/* Ta, Tmx */
75 	Week=		7*Day,		/* Tsoa, Tns */
76 	Year=		52*Week,
77 	DEFTTL=		Day,
78 
79 	/* reserved time (can't be timed out earlier) */
80 	Reserved=	5*Min,
81 
82 	/* packet sizes */
83 	Maxudp=		512,	/* maximum bytes per udp message */
84 	Maxudpin=	2048,	/* maximum bytes per udp message */
85 
86 	/* length of domain name hash table */
87 	HTLEN= 		4*1024,
88 
89 #define 	RRmagic	0xdeadbabe
90 #define	DNmagic	0xa110a110
91 
92 	/* parallelism */
93 	Maxactive=	32
94 };
95 
96 typedef struct DN	DN;
97 typedef struct DNSmsg	DNSmsg;
98 typedef struct RR	RR;
99 typedef struct SOA	SOA;
100 typedef struct Area	Area;
101 typedef struct Request	Request;
102 typedef struct Key	Key;
103 typedef struct Cert	Cert;
104 typedef struct Sig	Sig;
105 typedef struct Null	Null;
106 typedef struct Server	Server;
107 typedef struct Txt	Txt;
108 
109 /*
110  *  a structure to track a request and any slave process handling it
111  */
112 struct Request
113 {
114 	ulong	aborttime;	/* time at which we give up */
115 	int	id;
116 };
117 
118 /*
119  *  a domain name
120  */
121 struct DN
122 {
123 	DN	*next;		/* hash collision list */
124 	ulong	magic;
125 	char	*name;		/* owner */
126 	RR	*rr;		/* resource records off this name */
127 	ulong	referenced;	/* time last referenced */
128 	ulong	lookuptime;	/* last time we tried to get a better value */
129 	ushort	class;		/* RR class */
130 	char	refs;		/* for mark and sweep */
131 	char	nonexistent;	/* true if we get an authoritative nx for this domain */
132 	ulong	ordinal;
133 };
134 
135 /*
136  *  security info
137  */
138 struct Key
139 {
140 	int	flags;
141 	int	proto;
142 	int	alg;
143 	int	dlen;
144 	uchar	*data;
145 };
146 struct Cert
147 {
148 	int	type;
149 	int	tag;
150 	int	alg;
151 	int	dlen;
152 	uchar	*data;
153 };
154 struct Sig
155 {
156 	int	type;
157 	int	alg;
158 	int	labels;
159 	ulong	ttl;
160 	ulong	exp;
161 	ulong	incep;
162 	int	tag;
163 	DN	*signer;
164 	int	dlen;
165 	uchar	*data;
166 };
167 struct Null
168 {
169 	int	dlen;
170 	uchar	*data;
171 };
172 
173 /*
174  *  text strings
175  */
176 struct Txt
177 {
178 	Txt	*next;
179 	char	*p;
180 };
181 
182 /*
183  *  an unpacked resource record
184  */
185 struct RR
186 {
187 	RR	*next;
188 	ulong	magic;
189 	DN	*owner;		/* domain that owns this resource record */
190 	uchar	negative;	/* this is a cached negative response */
191 	ulong	pc;
192 	ulong	ttl;		/* time to live to be passed on */
193 	ulong	expire;		/* time this entry expires locally */
194 	ushort	type;		/* RR type */
195 	ushort	query;		/* query tyis is in response to */
196 	uchar	auth;		/* authoritative */
197 	uchar	db;		/* from database */
198 	uchar	cached;		/* rr in cache */
199 	ulong	marker;		/* used locally when scanning rrlists */
200 /*	union { */
201 		DN	*negsoaowner;	/* soa for cached negative response */
202 		DN	*host;	/* hostname - soa, cname, mb, md, mf, mx, ns */
203 		DN	*cpu;	/* cpu type - hinfo */
204 		DN	*mb;	/* mailbox - mg, minfo */
205 		DN	*ip;	/* ip addrss - a */
206 		DN	*rp;	/* rp arg - rp */
207 		int	cruftlen;
208 		ulong	arg0;
209 /*	}; */
210 /*	union { */
211 		int	negrcode;	/* response code for cached negative response */
212 		DN	*rmb;	/* responsible maibox - minfo, soa, rp */
213 		DN	*ptr;	/* pointer to domain name - ptr */
214 		DN	*os;	/* operating system - hinfo */
215 		ulong	pref;	/* preference value - mx */
216 		ulong	local;	/* ns served from local database - ns */
217 		ulong	arg1;
218 /*	}; */
219 /*	union { */
220 		SOA	*soa;	/* soa timers - soa */
221 		Key	*key;
222 		Cert	*cert;
223 		Sig	*sig;
224 		Null	*null;
225 		Txt	*txt;
226 /*	}; */
227 };
228 
229 /*
230  *  list of servers
231  */
232 struct Server
233 {
234 	Server	*next;
235 	char	*name;
236 };
237 
238 /*
239  *  timers for a start of authenticated record
240  */
241 struct SOA
242 {
243 	ulong	serial;		/* zone serial # (sec) - soa */
244 	ulong	refresh;	/* zone refresh interval (sec) - soa */
245 	ulong	retry;		/* zone retry interval (sec) - soa */
246 	ulong	expire;		/* time to expiration (sec) - soa */
247 	ulong	minttl;		/* minimum time to live for any entry (sec) - soa */
248 	Server	*slaves;	/* slave servers */
249 };
250 
251 /*
252  *  domain messages
253  */
254 struct DNSmsg
255 {
256 	ushort	id;
257 	int	flags;
258 	int	qdcount;	/* questions */
259 	RR 	*qd;
260 	int	ancount;	/* answers */
261 	RR	*an;
262 	int	nscount;	/* name servers */
263 	RR	*ns;
264 	int	arcount;	/* hints */
265 	RR	*ar;
266 };
267 
268 /*
269  *  definition of local area for dblookup
270  */
271 struct Area
272 {
273 	Area		*next;
274 
275 	int		len;		/* strlen(area->soarr->owner->name) */
276 	RR		*soarr;		/* soa defining this area */
277 	int		neednotify;
278 	int		needrefresh;
279 };
280 
281 enum
282 {
283 	Recurse,
284 	Dontrecurse,
285 	NOneg,
286 	OKneg
287 };
288 
289 enum
290 {
291 	STACK = 32*1024
292 };
293 
294 /* dn.c */
295 extern char	*rrtname[];
296 extern char	*rname[];
297 extern void	db2cache(int);
298 extern void	dninit(void);
299 extern DN*	dnlookup(char*, int, int);
300 extern void	dnage(DN*);
301 extern void	dnageall(int);
302 extern void	dnagedb(void);
303 extern void	dnauthdb(void);
304 extern void	dnget(void);
305 extern void	dnpurge(void);
306 extern void	dnput(void);
307 extern Area*	inmyarea(char*);
308 extern void	rrattach(RR*, int);
309 extern RR*	rralloc(int);
310 extern void	rrfree(RR*);
311 extern void	rrfreelist(RR*);
312 extern RR*	rrlookup(DN*, int, int);
313 extern RR*	rrcat(RR**, RR*);
314 extern RR**	rrcopy(RR*, RR**);
315 extern RR*	rrremneg(RR**);
316 extern RR*	rrremtype(RR**, int);
317 extern int	rrfmt(Fmt*);
318 extern int	rravfmt(Fmt*);
319 extern int	rrsupported(int);
320 extern int	rrtype(char*);
321 extern char*	rrname(int, char*, int);
322 extern int	tsame(int, int);
323 extern void	dndump(char*);
324 extern int	getactivity(Request*);
325 extern void	putactivity(void);
326 extern void	warning(char*, ...);
327 extern void	dncheck(void*, int);
328 extern void	unique(RR*);
329 extern int	subsume(char*, char*);
330 extern RR*	randomize(RR*);
331 extern void*	emalloc(int);
332 extern char*	estrdup(char*);
333 extern void	dnptr(uchar*, uchar*, char*, int, int);
334 extern void	addserver(Server**, char*);
335 extern Server*	copyserverlist(Server*);
336 extern void	freeserverlist(Server*);
337 
338 /* dnarea.c */
339 extern void	refresh_areas(Area*);
340 extern void	freearea(Area**);
341 extern void	addarea(DN *dp, RR *rp, Ndbtuple *t);
342 
343 /* dblookup.c */
344 extern RR*	dblookup(char*, int, int, int, int);
345 extern RR*	dbinaddr(DN*, int);
346 extern int	baddelegation(RR*, RR*, uchar*);
347 extern RR*	dnsservers(int);
348 extern RR*	domainlist(int);
349 extern int	opendatabase(void);
350 
351 /* dns.c */
352 extern char*	walkup(char*);
353 extern RR*	getdnsservers(int);
354 extern void	logreply(int, uchar*, DNSmsg*);
355 extern void	logsend(int, int, uchar*, char*, char*, int);
356 
357 /* dnresolve.c */
358 extern RR*	dnresolve(char*, int, int, Request*, RR**, int, int, int, int*);
359 extern int	udpport(void);
360 extern int	mkreq(DN *dp, int type, uchar *buf, int flags, ushort reqno);
361 
362 /* dnserver.c */
363 extern void	dnserver(DNSmsg*, DNSmsg*, Request*);
364 extern void	dnudpserver(void*);
365 extern void	dntcpserver(void*);
366 extern void	tcpproc(void*);
367 
368 /* dnnotify.c */
369 extern void	dnnotify(DNSmsg*, DNSmsg*, Request*);
370 extern void	notifyproc(void*);
371 
372 /* convDNS2M.c */
373 extern int	convDNS2M(DNSmsg*, uchar*, int);
374 
375 /* convM2DNS.c */
376 extern char*	convM2DNS(uchar*, int, DNSmsg*);
377 
378 /* malloc.c */
379 extern void	mallocsanity(void*);
380 extern void	lasthist(void*, int, ulong);
381 
382 /* runproc.c */
383 extern Waitmsg*	runproc(char*, char**, int);
384 extern Waitmsg*	runprocfd(char*, char**, int[3]);
385 
386 extern int	debug;
387 extern int	traceactivity;
388 extern char	*trace;
389 extern int	testing;	/* test cache whenever removing a DN */
390 extern int	cachedb;
391 extern int	needrefresh;
392 extern char	*dbfile;
393 extern char	mntpt[];
394 extern char	*logfile;
395 extern int	resolver;
396 extern int	maxage;		/* age of oldest entry in cache (secs) */
397 extern char	*zonerefreshprogram;
398 extern int	sendnotifies;
399 extern ulong	now;		/* time base */
400 extern Area	*owned;
401 extern Area	*delegated;
402 
403 extern char	*udpaddr;
404 extern char	*tcpaddr;
405 
406 #ifdef VARARGCK
407 #pragma	varargck	type	"R"	RR*
408 #pragma	varargck	type	"Q"	RR*
409 #endif