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001: /*
002:  * Copyright (c) 1983, 1987, 1989
003:  *    The Regents of the University of California.  All rights reserved.
004:  *
005:  * Redistribution and use in source and binary forms, with or without
006:  * modification, are permitted provided that the following conditions
007:  * are met:
008:  * 1. Redistributions of source code must retain the above copyright
009:  *    notice, this list of conditions and the following disclaimer.
010:  * 2. Redistributions in binary form must reproduce the above copyright
011:  *    notice, this list of conditions and the following disclaimer in the
012:  *    documentation and/or other materials provided with the distribution.
013:  * 4. Neither the name of the University nor the names of its contributors
014:  *    may be used to endorse or promote products derived from this software
015:  *    without specific prior written permission.
016:  *
017:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
018:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
020:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
021:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
022:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
023:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
024:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
025:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
026:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
027:  * SUCH DAMAGE.
028:  */
029: 
030: /*
031:  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
032:  *
033:  * Permission to use, copy, modify, and distribute this software for any
034:  * purpose with or without fee is hereby granted, provided that the above
035:  * copyright notice and this permission notice appear in all copies.
036:  *
037:  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
038:  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
039:  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
040:  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
041:  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
042:  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
043:  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
044:  * SOFTWARE.
045:  */
046: 
047: /*
048:  *      @(#)resolv.h    8.1 (Berkeley) 6/2/93
049:  *      $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
050:  */
051: 
052: #ifndef _RESOLV_H_
053: 
054: /* These headers are needed for types used in the `struct res_state'
055:    declaration.  */
056: #include <sys/types.h>
057: #include <netinet/in.h>
058: 
059: #ifndef __need_res_state
060: # define _RESOLV_H_
061: 
062: # include <sys/param.h>
063: # include <sys/cdefs.h>
064: # include <stdio.h>
065: # include <arpa/nameser.h>
066: #endif
067: 
068: #ifndef __res_state_defined
069: # define __res_state_defined
070: 
071: typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
072:         res_sendhookact;
073: 
074: typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *__ns,
075:                                            const u_char **__query,
076:                                            int *__querylen,
077:                                            u_char *__ans,
078:                                            int __anssiz,
079:                                            int *__resplen);
080: 
081: typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *__ns,
082:                                            const u_char *__query,
083:                                            int __querylen,
084:                                            u_char *__ans,
085:                                            int __anssiz,
086:                                            int *__resplen);
087: 
088: /*
089:  * Global defines and variables for resolver stub.
090:  */
091: # define MAXNS                  3       /* max # name servers we'll track */
092: # define MAXDFLSRCH             3       /* # default domain levels to try */
093: # define MAXDNSRCH              6       /* max # domains in search path */
094: # define LOCALDOMAINPARTS       2       /* min levels in name that is "local" */
095: 
096: # define RES_TIMEOUT            5       /* min. seconds between retries */
097: # define MAXRESOLVSORT          10      /* number of net to sort on */
098: # define RES_MAXNDOTS           15      /* should reflect bit field size */
099: # define RES_MAXRETRANS         30      /* only for resolv.conf/RES_OPTIONS */
100: # define RES_MAXRETRY           5       /* only for resolv.conf/RES_OPTIONS */
101: # define RES_DFLRETRY           2       /* Default #/tries. */
102: # define RES_MAXTIME            65535   /* Infinity, in milliseconds. */
103: 
104: struct __res_state {
105:         int     retrans;                /* retransmition time interval */
106:         int     retry;                  /* number of times to retransmit */
107:         u_long  options;                /* option flags - see below. */
108:         int     nscount;                /* number of name servers */
109:         struct sockaddr_in
110:                 nsaddr_list[MAXNS];     /* address of name server */
111: # define nsaddr nsaddr_list[0]          /* for backward compatibility */
112:         u_short id;                     /* current message id */
113:         /* 2 byte hole here.  */
114:         char    *dnsrch[MAXDNSRCH+1];   /* components of domain to search */
115:         char    defdname[256];          /* default domain (deprecated) */
116:         u_long  pfcode;                 /* RES_PRF_ flags - see below. */
117:         unsigned ndots:4;               /* threshold for initial abs. query */
118:         unsigned nsort:4;               /* number of elements in sort_list[] */
119:         unsigned ipv6_unavail:1;        /* connecting to IPv6 server failed */
120:         unsigned unused:23;
121:         struct {
122:                 struct in_addr  addr;
123:                 u_int32_t       mask;
124:         } sort_list[MAXRESOLVSORT];
125:         /* 4 byte hole here on 64-bit architectures.  */
126:         res_send_qhook qhook;           /* query hook */
127:         res_send_rhook rhook;           /* response hook */
128:         int     res_h_errno;            /* last one set for this context */
129:         int     _vcsock;                /* PRIVATE: for res_send VC i/o */
130:         u_int   _flags;                 /* PRIVATE: see below */
131:         /* 4 byte hole here on 64-bit architectures.  */
132:         union {
133:                 char    pad[52];        /* On an i386 this means 512b total. */
134:                 struct {
135:                         u_int16_t               nscount;
136:                         u_int16_t               nsmap[MAXNS];
137:                         int                     nssocks[MAXNS];
138:                         u_int16_t               nscount6;
139:                         u_int16_t               nsinit;
140:                         struct sockaddr_in6     *nsaddrs[MAXNS];
141: #ifdef _LIBC
142:                         unsigned long long int  initstamp
143:                           __attribute__((packed));
144: #else
145:                         unsigned int            _initstamp[2];
146: #endif
147:                 } _ext;
148:         } _u;
149: };
150: 
151: typedef struct __res_state *res_state;
152: # undef __need_res_state
153: #endif
154: 
155: #ifdef _RESOLV_H_
156: /*
157:  * Revision information.  This is the release date in YYYYMMDD format.
158:  * It can change every day so the right thing to do with it is use it
159:  * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
160:  * compare for equality; rather, use it to determine whether your resolver
161:  * is new enough to contain a certain feature.
162:  */
163: 
164: #define __RES   19991006
165: 
166: /*
167:  * Resolver configuration file.
168:  * Normally not present, but may contain the address of the
169:  * inital name server(s) to query and the domain search list.
170:  */
171: 
172: #ifndef _PATH_RESCONF
173: #define _PATH_RESCONF        "/etc/resolv.conf"
174: #endif
175: 
176: struct res_sym {
177:         int     number;         /* Identifying number, like T_MX */
178:         char *  name;           /* Its symbolic name, like "MX" */
179:         char *  humanname;      /* Its fun name, like "mail exchanger" */
180: };
181: 
182: /*
183:  * Resolver flags (used to be discrete per-module statics ints).
184:  */
185: #define RES_F_VC        0x00000001      /* socket is TCP */
186: #define RES_F_CONN      0x00000002      /* socket is connected */
187: #define RES_F_EDNS0ERR  0x00000004      /* EDNS0 caused errors */
188: 
189: /* res_findzonecut() options */
190: #define RES_EXHAUSTIVE  0x00000001      /* always do all queries */
191: 
192: /*
193:  * Resolver options (keep these in synch with res_debug.c, please)
194:  */
195: #define RES_INIT        0x00000001      /* address initialized */
196: #define RES_DEBUG       0x00000002      /* print debug messages */
197: #define RES_AAONLY      0x00000004      /* authoritative answers only (!IMPL)*/
198: #define RES_USEVC       0x00000008      /* use virtual circuit */
199: #define RES_PRIMARY     0x00000010      /* query primary server only (!IMPL) */
200: #define RES_IGNTC       0x00000020      /* ignore trucation errors */
201: #define RES_RECURSE     0x00000040      /* recursion desired */
202: #define RES_DEFNAMES    0x00000080      /* use default domain name */
203: #define RES_STAYOPEN    0x00000100      /* Keep TCP socket open */
204: #define RES_DNSRCH      0x00000200      /* search up local domain tree */
205: #define RES_INSECURE1   0x00000400      /* type 1 security disabled */
206: #define RES_INSECURE2   0x00000800      /* type 2 security disabled */
207: #define RES_NOALIASES   0x00001000      /* shuts off HOSTALIASES feature */
208: #define RES_USE_INET6   0x00002000      /* use/map IPv6 in gethostbyname() */
209: #define RES_ROTATE      0x00004000      /* rotate ns list after each query */
210: #define RES_NOCHECKNAME 0x00008000      /* do not check names for sanity. */
211: #define RES_KEEPTSIG    0x00010000      /* do not strip TSIG records */
212: #define RES_BLAST       0x00020000      /* blast all recursive servers */
213: #define RES_USEBSTRING  0x00040000      /* IPv6 reverse lookup with byte
214:                                            strings */
215: #define RES_NOIP6DOTINT 0x00080000      /* Do not use .ip6.int in IPv6
216:                                            reverse lookup */
217: #define RES_USE_EDNS0   0x00100000      /* Use EDNS0.  */
218: #define RES_SNGLKUP     0x00200000      /* one outstanding request at a time */
219: #define RES_SNGLKUPREOP 0x00400000      /* -"-, but open new socket for each
220:                                            request */
221: #define RES_USE_DNSSEC  0x00800000      /* use DNSSEC using OK bit in OPT */
222: #define RES_NOTLDQUERY  0x01000000      /* Do not look up unqualified name
223:                                            as a TLD.  */
224: 
225: #define RES_DEFAULT     (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
226: 
227: /*
228:  * Resolver "pfcode" values.  Used by dig.
229:  */
230: #define RES_PRF_STATS   0x00000001
231: #define RES_PRF_UPDATE  0x00000002
232: #define RES_PRF_CLASS   0x00000004
233: #define RES_PRF_CMD     0x00000008
234: #define RES_PRF_QUES    0x00000010
235: #define RES_PRF_ANS     0x00000020
236: #define RES_PRF_AUTH    0x00000040
237: #define RES_PRF_ADD     0x00000080
238: #define RES_PRF_HEAD1   0x00000100
239: #define RES_PRF_HEAD2   0x00000200
240: #define RES_PRF_TTLID   0x00000400
241: #define RES_PRF_HEADX   0x00000800
242: #define RES_PRF_QUERY   0x00001000
243: #define RES_PRF_REPLY   0x00002000
244: #define RES_PRF_INIT    0x00004000
245: /*                      0x00008000      */
246: 
247: /* Things involving an internal (static) resolver context. */
248: __BEGIN_DECLS
249: extern struct __res_state *__res_state(void) __attribute__ ((__const__));
250: __END_DECLS
251: #define _res (*__res_state())
252: 
253: #ifndef __BIND_NOSTATIC
254: #define fp_nquery               __fp_nquery
255: #define fp_query                __fp_query
256: #define hostalias               __hostalias
257: #define p_query                 __p_query
258: #define res_close               __res_close
259: #define res_init                __res_init
260: #define res_isourserver         __res_isourserver
261: #define res_mkquery             __res_mkquery
262: #define res_query               __res_query
263: #define res_querydomain         __res_querydomain
264: #define res_search              __res_search
265: #define res_send                __res_send
266: 
267: __BEGIN_DECLS
268: void            fp_nquery (const u_char *, int, FILE *) __THROW;
269: void            fp_query (const u_char *, FILE *) __THROW;
270: const char *    hostalias (const char *) __THROW;
271: void            p_query (const u_char *) __THROW;
272: void            res_close (void) __THROW;
273: int             res_init (void) __THROW;
274: int             res_isourserver (const struct sockaddr_in *) __THROW;
275: int             res_mkquery (int, const char *, int, int, const u_char *,
276:                              int, const u_char *, u_char *, int) __THROW;
277: int             res_query (const char *, int, int, u_char *, int) __THROW;
278: int             res_querydomain (const char *, const char *, int, int,
279:                                  u_char *, int) __THROW;
280: int             res_search (const char *, int, int, u_char *, int) __THROW;
281: int             res_send (const u_char *, int, u_char *, int) __THROW;
282: __END_DECLS
283: #endif
284: 
285: #define b64_ntop                __b64_ntop
286: #define b64_pton                __b64_pton
287: #define dn_comp                 __dn_comp
288: #define dn_count_labels         __dn_count_labels
289: #define dn_expand               __dn_expand
290: #define dn_skipname             __dn_skipname
291: #define fp_resstat              __fp_resstat
292: #define loc_aton                __loc_aton
293: #define loc_ntoa                __loc_ntoa
294: #define p_cdname                __p_cdname
295: #define p_cdnname               __p_cdnname
296: #define p_class                 __p_class
297: #define p_fqname                __p_fqname
298: #define p_fqnname               __p_fqnname
299: #define p_option                __p_option
300: #define p_secstodate            __p_secstodate
301: #define p_section               __p_section
302: #define p_time                  __p_time
303: #define p_type                  __p_type
304: #define p_rcode                 __p_rcode
305: #define putlong                 __putlong
306: #define putshort                __putshort
307: #define res_dnok                __res_dnok
308: #define res_hnok                __res_hnok
309: #define res_hostalias           __res_hostalias
310: #define res_mailok              __res_mailok
311: #define res_nameinquery         __res_nameinquery
312: #define res_nclose              __res_nclose
313: #define res_ninit               __res_ninit
314: #define res_nmkquery            __res_nmkquery
315: #define res_npquery             __res_npquery
316: #define res_nquery              __res_nquery
317: #define res_nquerydomain        __res_nquerydomain
318: #define res_nsearch             __res_nsearch
319: #define res_nsend               __res_nsend
320: #define res_nisourserver        __res_nisourserver
321: #define res_ownok               __res_ownok
322: #define res_queriesmatch        __res_queriesmatch
323: #define res_randomid            __res_randomid
324: #define sym_ntop                __sym_ntop
325: #define sym_ntos                __sym_ntos
326: #define sym_ston                __sym_ston
327: __BEGIN_DECLS
328: int             res_hnok (const char *) __THROW;
329: int             res_ownok (const char *) __THROW;
330: int             res_mailok (const char *) __THROW;
331: int             res_dnok (const char *) __THROW;
332: int             sym_ston (const struct res_sym *, const char *, int *) __THROW;
333: const char *    sym_ntos (const struct res_sym *, int, int *) __THROW;
334: const char *    sym_ntop (const struct res_sym *, int, int *) __THROW;
335: int             b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
336: int             b64_pton (char const *, u_char *, size_t) __THROW;
337: int             loc_aton (const char *__ascii, u_char *__binary) __THROW;
338: const char *    loc_ntoa (const u_char *__binary, char *__ascii) __THROW;
339: int             dn_skipname (const u_char *, const u_char *) __THROW;
340: void            putlong (u_int32_t, u_char *) __THROW;
341: void            putshort (u_int16_t, u_char *) __THROW;
342: const char *    p_class (int) __THROW;
343: const char *    p_time (u_int32_t) __THROW;
344: const char *    p_type (int) __THROW;
345: const char *    p_rcode (int) __THROW;
346: const u_char *  p_cdnname (const u_char *, const u_char *, int, FILE *)
347:      __THROW;
348: const u_char *  p_cdname (const u_char *, const u_char *, FILE *) __THROW;
349: const u_char *  p_fqnname (const u_char *__cp, const u_char *__msg,
350:                            int, char *, int) __THROW;
351: const u_char *  p_fqname (const u_char *, const u_char *, FILE *) __THROW;
352: const char *    p_option (u_long __option) __THROW;
353: char *          p_secstodate (u_long) __THROW;
354: int             dn_count_labels (const char *) __THROW;
355: int             dn_comp (const char *, u_char *, int, u_char **, u_char **)
356:      __THROW;
357: int             dn_expand (const u_char *, const u_char *, const u_char *,
358:                            char *, int) __THROW;
359: u_int           res_randomid (void) __THROW;
360: int             res_nameinquery (const char *, int, int,
361:                                  const u_char *, const u_char *) __THROW;
362: int             res_queriesmatch (const u_char *, const u_char *,
363:                                   const u_char *, const u_char *) __THROW;
364: const char *    p_section (int __section, int __opcode) __THROW;
365: /* Things involving a resolver context. */
366: int             res_ninit (res_state) __THROW;
367: int             res_nisourserver (const res_state,
368:                                   const struct sockaddr_in *) __THROW;
369: void            fp_resstat (const res_state, FILE *) __THROW;
370: void            res_npquery (const res_state, const u_char *, int, FILE *)
371:      __THROW;
372: const char *    res_hostalias (const res_state, const char *, char *, size_t)
373:      __THROW;
374: int             res_nquery (res_state, const char *, int, int, u_char *, int)
375:      __THROW;
376: int             res_nsearch (res_state, const char *, int, int, u_char *, int)
377:      __THROW;
378: int             res_nquerydomain (res_state, const char *, const char *, int,
379:                                   int, u_char *, int) __THROW;
380: int             res_nmkquery (res_state, int, const char *, int, int,
381:                               const u_char *, int, const u_char *, u_char *,
382:                               int) __THROW;
383: int             res_nsend (res_state, const u_char *, int, u_char *, int)
384:      __THROW;
385: void            res_nclose (res_state) __THROW;
386: __END_DECLS
387: #endif
388: 
389: #endif /* !_RESOLV_H_ */
390: 

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