1 #define NS2MS(ns) ((ns) / 1000000L)
2 #define S2MS(s) ((s) * 1000LL)
4 #define timems() NS2MS(nsec())
6 typedef struct Ndbtuple Ndbtuple;
10 /* RR types; see: http://www.iana.org/assignments/dns-parameters */
66 /* query types (all RR types are also queries) */
67 Ttkey= 249, /* transaction key */
68 Ttsig= 250, /* transaction signature */
69 Tixfr= 251, /* incremental zone transfer */
70 Taxfr= 252, /* zone transfer */
71 Tmailb= 253, /* { Tmb, Tmg, Tmr } */
72 Tmaila= 254, /* obsolete */
73 Tall= 255, /* all records */
76 Csym= 0, /* internal symbols */
77 Cin= 1, /* internet */
78 Ccs, /* CSNET (obsolete) */
82 /* class queries (all class types are also queries) */
83 Call= 255, /* all classes */
86 Oquery= 0<<11, /* normal query */
87 Oinverse= 1<<11, /* inverse query (retired) */
88 Ostatus= 2<<11, /* status request */
89 Onotify= 4<<11, /* notify slaves of updates */
91 Omask= 0xf<<11, /* mask for opcode */
95 Rformat= 1, /* format error */
96 Rserver= 2, /* server failure (e.g. no answer from something) */
97 Rname= 3, /* bad name */
98 Runimplimented= 4, /* unimplemented */
99 Rrefused= 5, /* we don't like you */
100 Ryxdomain= 6, /* name exists when it should not */
101 Ryxrrset= 7, /* rr set exists when it should not */
102 Rnxrrset= 8, /* rr set that should exist does not */
103 Rnotauth= 9, /* not authoritative */
104 Rnotzone= 10, /* name not in zone */
105 Rbadvers= 16, /* bad opt version */
106 /* Rbadsig= 16, */ /* also tsig signature failure */
107 Rbadkey= 17, /* key not recognized */
108 Rbadtime= 18, /* signature out of time window */
109 Rbadmode= 19, /* bad tkey mode */
110 Rbadname= 20, /* duplicate key name */
111 Rbadalg= 21, /* algorithm not supported */
112 Rmask= 0x1f, /* mask for response */
113 Rtimeout= 1<<5, /* timeout sending (for internal use only) */
115 /* bits in flag word (other than opcode and response) */
116 Fresp= 1<<15, /* message is a response */
117 Fauth= 1<<10, /* true if an authoritative response */
118 Ftrunc= 1<<9, /* truncated message */
119 Frecurse= 1<<8, /* request recursion */
120 Fcanrec= 1<<7, /* server can recurse */
122 Domlen= 256, /* max domain name length (with NULL) */
123 Labellen= 64, /* max domain label length (with NULL) */
124 Strlen= 256, /* max string length (with NULL) */
126 /* time to live values (in seconds) */
129 Day= 24*Hour, /* Ta, Tmx */
130 Week= 7*Day, /* Tsoa, Tns */
134 /* reserved time (can't be timed out earlier) */
138 Maxudp= 512, /* maximum bytes per udp message sent */
139 Maxudpin= 2048, /* maximum bytes per udp message rcv'd */
141 /* length of domain name hash table */
144 Maxpath= 128, /* size of mntpt */
145 Maxlcks= 10, /* max. query-type locks per domain name */
150 /* parallelism: tune; was 32; allow lots */
153 /* tune; was 60*1000; keep it short */
154 Maxreqtm= 8*1000, /* max. ms to process a request */
156 Notauthoritative = 0,
160 typedef struct Area Area;
161 typedef struct Block Block;
162 typedef struct Cert Cert;
163 typedef struct DN DN;
164 typedef struct DNSmsg DNSmsg;
165 typedef struct Key Key;
166 typedef struct Null Null;
167 typedef struct RR RR;
168 typedef struct Request Request;
169 typedef struct SOA SOA;
170 typedef struct Server Server;
171 typedef struct Sig Sig;
172 typedef struct Srv Srv;
173 typedef struct Txt Txt;
176 * a structure to track a request and any slave process handling it
180 int isslave; /* pid of slave */
181 uvlong aborttime; /* time in ms at which we give up */
182 jmp_buf mret; /* where master jumps to after starting a slave */
184 char *from; /* who asked us? */
192 DN *next; /* hash collision list */
194 char *name; /* owner */
195 RR *rr; /* resource records off this name */
196 ulong referenced; /* time last referenced */
197 ulong lookuptime; /* last time we tried to get a better value */
198 /* refs was `char' but we've seen refs > 120, so go whole hog */
199 ulong refs; /* for mark and sweep */
201 ushort class; /* RR class */
202 uchar keep; /* flag: never age this name */
203 uchar respcode; /* response code */
252 * an unpacked resource record
258 DN *owner; /* domain that owns this resource record */
259 uintptr pc; /* for tracking memory allocation */
260 ulong ttl; /* time to live to be passed on */
261 ulong expire; /* time this entry expires locally */
262 ulong marker; /* used locally when scanning rrlists */
263 ushort type; /* RR type */
264 ushort query; /* query type is in response to */
265 uchar auth; /* flag: authoritative */
266 uchar db; /* flag: from database */
267 uchar cached; /* flag: rr in cache */
268 uchar negative; /* flag: this is a cached negative response */
270 union { /* discriminated by negative & type */
271 DN *negsoaowner; /* soa for cached negative response */
272 DN *host; /* hostname - soa, cname, mb, md, mf, mx, ns, srv */
273 DN *cpu; /* cpu type - hinfo */
274 DN *mb; /* mailbox - mg, minfo */
275 DN *ip; /* ip address - a, aaaa */
276 DN *rp; /* rp arg - rp */
277 uintptr arg0; /* arg[01] are compared to find dups in dn.c */
279 union { /* discriminated by negative & type */
280 int negrcode; /* response code for cached negative resp. */
281 DN *rmb; /* responsible maibox - minfo, soa, rp */
282 DN *ptr; /* pointer to domain name - ptr */
283 DN *os; /* operating system - hinfo */
284 ulong pref; /* preference value - mx */
285 ulong local; /* ns served from local database - ns */
286 ushort port; /* - srv */
287 uintptr arg1; /* arg[01] are compared to find dups in dn.c */
289 union { /* discriminated by type */
290 SOA *soa; /* soa timers - soa */
310 * timers for a start-of-authority record. all ulongs are in seconds.
314 ulong serial; /* zone serial # */
315 ulong refresh; /* zone refresh interval */
316 ulong retry; /* zone retry interval */
317 ulong expire; /* time to expiration */
318 ulong minttl; /* min. time to live for any entry */
320 Server *slaves; /* slave servers */
324 * srv (service location) record (rfc2782):
325 * _service._proto.name ttl class(IN) 'SRV' priority weight port target
333 typedef struct Rrlist Rrlist;
347 int qdcount; /* questions */
349 int ancount; /* answers */
351 int nscount; /* name servers */
353 int arcount; /* hints */
358 * definition of local area for dblookup
364 int len; /* strlen(area->soarr->owner->name) */
365 RR *soarr; /* soa defining this area */
370 typedef struct Cfg Cfg;
374 int justforw; /* flag: pure resolver, just forward queries */
375 int serve; /* flag: serve udp queries */
380 /* (udp) query stats */
383 ulong slavehiwat; /* procs */
384 ulong qrecvd9p; /* query counts */
387 ulong qrecvd9prpc; /* packet count */
389 /* reply times by count */
390 ulong under10ths[3*10+2]; /* under n*0.1 seconds, n is index */
395 ulong answinmem; /* answers in memory */
396 ulong negans; /* negative answers received */
397 ulong negserver; /* neg ans with Rserver set */
398 ulong negbaddeleg; /* neg ans with bad delegations */
399 ulong negbdnoans; /* ⋯ and no answers */
400 ulong negnorname; /* neg ans with no Rname set */
401 ulong negcached; /* neg ans cached */
417 extern Area *delegated;
418 extern char *logfile;
419 extern int maxage; /* age of oldest entry in cache (secs) */
421 extern int needrefresh;
422 extern int norecursion;
423 extern ulong now; /* time base */
426 extern int sendnotifies;
428 extern int testing; /* test cache whenever removing a DN */
430 extern int traceactivity;
431 extern char *zonerefreshprogram;
433 #pragma varargck type "R" RR*
434 #pragma varargck type "Q" RR*
438 extern char *rrtname[];
439 extern char *rname[];
440 extern unsigned nrname;
441 extern char *opname[];
444 void abort(); /* char*, ... */;
445 void addserver(Server**, char*);
446 Server* copyserverlist(Server*);
451 void dnagenever(DN *, int);
457 DN* dnlookup(char*, int, int);
458 void dnptr(uchar*, uchar*, char*, int, int, int);
461 void dnslog(char*, ...);
462 void dnstats(char *file);
464 char* estrdup(char*);
465 void freeanswers(DNSmsg *mp);
466 void freeserverlist(Server*);
467 int getactivity(Request*, int);
468 Area* inmyarea(char*);
469 void putactivity(int);
472 void rrattach(RR*, int);
474 RR* rrcat(RR**, RR*);
475 RR** rrcopy(RR*, RR**);
478 void rrfreelist(RR*);
479 RR* rrlookup(DN*, int, int);
480 char* rrname(int, char*, int);
482 RR* rrremtype(RR**, int);
483 int rrsupported(int);
485 void slave(Request*);
486 int subsume(char*, char*);
489 void warning(char*, ...);
492 void refresh_areas(Area*);
493 void freearea(Area**);
494 void addarea(DN *dp, RR *rp, Ndbtuple *t);
497 int baddelegation(RR*, RR*, uchar*);
498 RR* dbinaddr(DN*, int);
499 RR* dblookup(char*, int, int, int, int);
502 int insideaddr(char *dom);
503 int insidens(uchar *ip);
504 int myaddr(char *addr);
505 int opendatabase(void);
506 int outsidensip(int, uchar *ip);
510 RR* getdnsservers(int);
511 void logreply(int, uchar*, DNSmsg*);
512 void logsend(int, int, uchar*, char*, char*, int);
513 void procsetname(char *fmt, ...);
516 RR* dnresolve(char*, int, int, Request*, RR**, int, int, int, int*);
518 int mkreq(DN *dp, int type, uchar *buf, int flags, ushort reqno);
520 void initdnsmsg(DNSmsg *mp, RR *rp, int flags, ushort reqno);
523 void dnserver(DNSmsg*, DNSmsg*, Request*, uchar *, int);
524 void dnudpserver(char*);
525 void dntcpserver(char*);
528 void dnnotify(DNSmsg*, DNSmsg*, Request*);
529 void notifyproc(void);
532 int convDNS2M(DNSmsg*, uchar*, int);
535 char* convM2DNS(uchar*, int, DNSmsg*, int*);
537 #pragma varargck argpos dnslog 1