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1  /*	$NetBSD: resolv.h,v 1.31 2005/12/26 19:01:47 perry Exp $	*/
2  
3  /*
4   * Copyright (c) 1983, 1987, 1989
5   *    The Regents of the University of California.  All rights reserved.
6   *
7   * Redistribution and use in source and binary forms, with or without
8   * modification, are permitted provided that the following conditions
9   * are met:
10   * 1. Redistributions of source code must retain the above copyright
11   *    notice, this list of conditions and the following disclaimer.
12   * 2. Redistributions in binary form must reproduce the above copyright
13   *    notice, this list of conditions and the following disclaimer in the
14   *    documentation and/or other materials provided with the distribution.
15   * 3. Neither the name of the University nor the names of its contributors
16   *    may be used to endorse or promote products derived from this software
17   *    without specific prior written permission.
18   *
19   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29   * SUCH DAMAGE.
30   */
31  
32  /*
33   * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
34   * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
35   *
36   * Permission to use, copy, modify, and distribute this software for any
37   * purpose with or without fee is hereby granted, provided that the above
38   * copyright notice and this permission notice appear in all copies.
39   *
40   * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
41   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
42   * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
43   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
44   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
45   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
46   * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
47   */
48  
49  /*
50   *	@(#)resolv.h	8.1 (Berkeley) 6/2/93
51   *	Id: resolv.h,v 1.7.2.11.4.2 2004/06/25 00:41:05 marka Exp
52   */
53  
54  #pragma once
55  
56  #include <sys/cdefs.h>
57  
58  #include <resolv.h>
59  #include "resolv_static.h"
60  #include "resolv_params.h"
61  #include "resolv_stats.h"
62  #include <net/if.h>
63  #include <time.h>
64  
65  __BEGIN_DECLS
66  
67  // Linux defines MAXHOSTNAMELEN as 64, while the domain name limit in
68  // RFC 1034 and RFC 1035 is 255 octets.
69  #ifdef MAXHOSTNAMELEN
70  #undef MAXHOSTNAMELEN
71  #endif
72  #define MAXHOSTNAMELEN 256
73  
74  /*
75   * Revision information.  This is the release date in YYYYMMDD format.
76   * It can change every day so the right thing to do with it is use it
77   * in preprocessor commands such as "#if (__RES > 19931104)".  Do not
78   * compare for equality; rather, use it to determine whether your resolver
79   * is new enough to contain a certain feature.
80   */
81  
82  #define	__RES	20030124
83  
84  /*
85   * This used to be defined in res_query.c, now it's in herror.c.
86   * [XXX no it's not.  It's in irs/irs_data.c]
87   * It was
88   * never extern'd by any *.h file before it was placed here.  For thread
89   * aware programs, the last h_errno value set is stored in res->h_errno.
90   *
91   * XXX:	There doesn't seem to be a good reason for exposing RES_SET_H_ERRNO
92   *	(and __h_errno_set) to the public via <resolv.h>.
93   * XXX:	__h_errno_set is really part of IRS, not part of the resolver.
94   *	If somebody wants to build and use a resolver that doesn't use IRS,
95   *	what do they do?  Perhaps something like
96   *		#ifdef WANT_IRS
97   *		# define RES_SET_H_ERRNO(r,x) __h_errno_set(r,x)
98   *		#else
99   *		# define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
100   *		#endif
101   */
102  
103  #define RES_SET_H_ERRNO(r,x) (h_errno = (r)->res_h_errno = (x))
104  struct __res_state; /* forward */
105  
106  /*
107   * Resolver configuration file.
108   * Normally not present, but may contain the address of the
109   * initial name server(s) to query and the domain search list.
110   */
111  
112  #ifndef _PATH_RESCONF
113  #ifdef ANDROID_CHANGES
114  #define _PATH_RESCONF        "/etc/ppp/resolv.conf"
115  #else
116  #define _PATH_RESCONF        "/etc/resolv.conf"
117  #endif
118  #endif
119  
120  struct res_sym {
121  	int		number;	   /* Identifying number, like T_MX */
122  	const char *	name;	   /* Its symbolic name, like "MX" */
123  	const char *	humanname; /* Its fun name, like "mail exchanger" */
124  };
125  
126  /*
127   * Global defines and variables for resolver stub.
128   */
129  #define	MAXDFLSRCH		3	/* # default domain levels to try */
130  #define	LOCALDOMAINPARTS	2	/* min levels in name that is "local" */
131  
132  #define	RES_TIMEOUT		5	/* min. seconds between retries */
133  #define	MAXRESOLVSORT		10	/* number of net to sort on */
134  #define	RES_MAXNDOTS		15	/* should reflect bit field size */
135  #define	RES_MAXRETRANS		30	/* only for resolv.conf/RES_OPTIONS */
136  #define	RES_MAXRETRY		5	/* only for resolv.conf/RES_OPTIONS */
137  #define	RES_DFLRETRY		2	/* Default #/tries. */
138  #define	RES_MAXTIME		65535	/* Infinity, in milliseconds. */
139  
140  struct __res_state_ext;
141  
142  struct __res_state {
143  	unsigned	netid;			/* NetId: cache key and socket mark */
144  	int	retrans;	 	/* retransmission time interval */
145  	int	retry;			/* number of times to retransmit */
146  #ifdef sun
147  	u_int	options;		/* option flags - see below. */
148  #else
149  	u_long	options;		/* option flags - see below. */
150  #endif
151  	int	nscount;		/* number of name servers */
152  	struct sockaddr_in
153  		nsaddr_list[MAXNS];	/* address of name server */
154  #define	nsaddr	nsaddr_list[0]		/* for backward compatibility */
155  	u_short	id;			/* current message id */
156  	char	*dnsrch[MAXDNSRCH+1];	/* components of domain to search */
157  	char	defdname[256];		/* default domain (deprecated) */
158  #ifdef sun
159  	u_int	pfcode;			/* RES_PRF_ flags - see below. */
160  #else
161  	u_long	pfcode;			/* RES_PRF_ flags - see below. */
162  #endif
163  	unsigned ndots:4;		/* threshold for initial abs. query */
164  	unsigned nsort:4;		/* number of elements in sort_list[] */
165  	char	unused[3];
166  	struct {
167  		struct in_addr	addr;
168  		uint32_t	mask;
169  	} sort_list[MAXRESOLVSORT];
170  #ifdef __OLD_RES_STATE
171  	char lookups[4];
172  #else
173  	res_send_qhook qhook;		/* query hook */
174  	res_send_rhook rhook;		/* response hook */
175  	int	res_h_errno;		/* last one set for this context */
176  	unsigned _mark;			/* If non-0 SET_MARK to _mark on all request sockets */
177  	int	_vcsock;		/* PRIVATE: for res_send VC i/o */
178  	u_int	_flags;			/* PRIVATE: see below */
179  	u_int	_pad;			/* make _u 64 bit aligned */
180  	union {
181  		/* On an 32-bit arch this means 512b total. */
182  		char	pad[72 - 4*sizeof (int) - 2*sizeof (void *)];
183  		struct {
184  			uint16_t		nscount;
185  			uint16_t		nstimes[MAXNS];	/* ms. */
186  			int			nssocks[MAXNS];
187  			struct __res_state_ext *ext;	/* extention for IPv6 */
188  		} _ext;
189  	} _u;
190  #endif
191          struct res_static   rstatic[1];
192  };
193  
194  typedef struct __res_state *res_state;
195  
196  /* Retrieve a local copy of the stats for the given netid. The buffer must have space for
197   * MAXNS __resolver_stats. Returns the revision id of the resolvers used.
198   */
199  __LIBC_HIDDEN__
200  extern int
201  _resolv_cache_get_resolver_stats( unsigned netid, struct __res_params* params,
202          struct __res_stats stats[MAXNS]);
203  
204  /* Add a sample to the shared struct for the given netid and server, provided that the
205   * revision_id of the stored servers has not changed.
206   */
207  __LIBC_HIDDEN__
208  extern void
209  _resolv_cache_add_resolver_stats_sample( unsigned netid, int revision_id, int ns,
210          const struct __res_sample* sample, int max_samples);
211  
212  /* End of stats related definitions */
213  
214  union res_sockaddr_union {
215  	struct sockaddr_in	sin;
216  #ifdef IN6ADDR_ANY_INIT
217  	struct sockaddr_in6	sin6;
218  #endif
219  #ifdef ISC_ALIGN64
220  	int64_t			__align64;	/* 64bit alignment */
221  #else
222  	int32_t			__align32;	/* 32bit alignment */
223  #endif
224  	char			__space[128];   /* max size */
225  };
226  
227  /*
228   * Resolver flags (used to be discrete per-module statics ints).
229   */
230  #define	RES_F_VC	0x00000001	/* socket is TCP */
231  #define	RES_F_CONN	0x00000002	/* socket is connected */
232  #define	RES_F_EDNS0ERR	0x00000004	/* EDNS0 caused errors */
233  #define	RES_F__UNUSED	0x00000008	/* (unused) */
234  #define	RES_F_LASTMASK	0x000000F0	/* ordinal server of last res_nsend */
235  #define	RES_F_LASTSHIFT	4		/* bit position of LASTMASK "flag" */
236  #define	RES_GETLAST(res) (((res)._flags & RES_F_LASTMASK) >> RES_F_LASTSHIFT)
237  
238  /* res_findzonecut2() options */
239  #define	RES_EXHAUSTIVE	0x00000001	/* always do all queries */
240  #define	RES_IPV4ONLY	0x00000002	/* IPv4 only */
241  #define	RES_IPV6ONLY	0x00000004	/* IPv6 only */
242  
243  /*
244   * Resolver options (keep these in synch with res_debug.c, please)
245   */
246  #define RES_INIT	0x00000001	/* address initialized */
247  #define RES_DEBUG	0x00000002	/* print debug messages */
248  #define RES_AAONLY	0x00000004	/* authoritative answers only (!IMPL)*/
249  #define RES_USEVC	0x00000008	/* use virtual circuit */
250  #define RES_PRIMARY	0x00000010	/* query primary server only (!IMPL) */
251  #define RES_IGNTC	0x00000020	/* ignore trucation errors */
252  #define RES_RECURSE	0x00000040	/* recursion desired */
253  #define RES_DEFNAMES	0x00000080	/* use default domain name */
254  #define RES_STAYOPEN	0x00000100	/* Keep TCP socket open */
255  #define RES_DNSRCH	0x00000200	/* search up local domain tree */
256  #define	RES_INSECURE1	0x00000400	/* type 1 security disabled */
257  #define	RES_INSECURE2	0x00000800	/* type 2 security disabled */
258  #define	RES_NOALIASES	0x00001000	/* shuts off HOSTALIASES feature */
259  #define	RES_USE_INET6	0x00002000	/* use/map IPv6 in gethostbyname() */
260  #define RES_ROTATE	0x00004000	/* rotate ns list after each query */
261  #define	RES_NOCHECKNAME	0x00008000	/* do not check names for sanity. */
262  #define	RES_KEEPTSIG	0x00010000	/* do not strip TSIG records */
263  #define	RES_BLAST	0x00020000	/* blast all recursive servers */
264  #define RES_NOTLDQUERY	0x00100000	/* don't unqualified name as a tld */
265  #define RES_USE_DNSSEC	0x00200000	/* use DNSSEC using OK bit in OPT */
266  /* #define RES_DEBUG2	0x00400000 */	/* nslookup internal */
267  /* KAME extensions: use higher bit to avoid conflict with ISC use */
268  #define RES_USE_DNAME	0x10000000	/* use DNAME */
269  #define RES_USE_EDNS0	0x40000000	/* use EDNS0 if configured */
270  #define RES_NO_NIBBLE2	0x80000000	/* disable alternate nibble lookup */
271  
272  #define RES_DEFAULT	(RES_RECURSE | RES_DEFNAMES | \
273  			 RES_DNSRCH | RES_NO_NIBBLE2)
274  
275  /*
276   * Resolver "pfcode" values.  Used by dig.
277   */
278  #define RES_PRF_STATS	0x00000001
279  #define RES_PRF_UPDATE	0x00000002
280  #define RES_PRF_CLASS   0x00000004
281  #define RES_PRF_CMD	0x00000008
282  #define RES_PRF_QUES	0x00000010
283  #define RES_PRF_ANS	0x00000020
284  #define RES_PRF_AUTH	0x00000040
285  #define RES_PRF_ADD	0x00000080
286  #define RES_PRF_HEAD1	0x00000100
287  #define RES_PRF_HEAD2	0x00000200
288  #define RES_PRF_TTLID	0x00000400
289  #define RES_PRF_HEADX	0x00000800
290  #define RES_PRF_QUERY	0x00001000
291  #define RES_PRF_REPLY	0x00002000
292  #define RES_PRF_INIT	0x00004000
293  #define RES_PRF_TRUNC	0x00008000
294  /*			0x00010000	*/
295  
296  /* Things involving an internal (static) resolver context. */
297  __LIBC_HIDDEN__ extern struct __res_state *__res_get_state(void);
298  __LIBC_HIDDEN__ extern void __res_put_state(struct __res_state *);
299  
300  #ifndef ANDROID_CHANGES
301  /*
302   * Source and Binary compatibility; _res will not work properly
303   * with multi-threaded programs.
304   */
305  extern struct __res_state *__res_state(void);
306  #define _res (*__res_state())
307  #endif
308  
309  #ifndef __BIND_NOSTATIC
310  #define fp_nquery		__fp_nquery
311  #define fp_query		__fp_query
312  #define hostalias		__hostalias
313  #define p_query			__p_query
314  #define res_close		__res_close
315  #define res_opt			__res_opt
316  #define res_isourserver		__res_isourserver
317  #define	res_querydomain		__res_querydomain
318  #define res_send		__res_send
319  
320  #ifdef BIND_RES_POSIX3
321  #define	dn_expand	__dn_expand
322  #define	res_init	__res_init
323  #define	res_query	__res_query
324  #define	res_search	__res_search
325  #define	res_mkquery	__res_mkquery
326  #endif
327  
328  void		fp_nquery(const u_char *, int, FILE *);
329  void		fp_query(const u_char *, FILE *);
330  const char *	hostalias(const char *);
331  void		p_query(const u_char *);
332  void		res_close(void);
333  int		res_init(void);
334  __LIBC_HIDDEN__ int		res_opt(int, u_char *, int, int);
335  int		res_isourserver(const struct sockaddr_in *);
336  int		res_mkquery(int, const char *, int, int, const u_char *, int, const u_char *, u_char *, int);
337  int		res_query(const char *, int, int, u_char *, int);
338  int		res_querydomain(const char *, const char *, int, int, u_char *, int);
339  int		res_search(const char *, int, int, u_char *, int);
340  int		res_send(const u_char *, int, u_char *, int);
341  #endif
342  
343  #if !defined(SHARED_LIBBIND) || defined(LIB)
344  /*
345   * If libbind is a shared object (well, DLL anyway)
346   * these externs break the linker when resolv.h is
347   * included by a lib client (like named)
348   * Make them go away if a client is including this
349   *
350   */
351  __LIBC_HIDDEN__ extern const struct res_sym __p_key_syms[];
352  __LIBC_HIDDEN__ extern const struct res_sym __p_cert_syms[];
353  extern const struct res_sym __p_class_syms[];
354  extern const struct res_sym __p_type_syms[];
355  __LIBC_HIDDEN__ extern const struct res_sym __p_rcode_syms[];
356  #endif /* SHARED_LIBBIND */
357  
358  #ifndef ANDROID_CHANGES
359  #define dn_comp			__dn_comp
360  #endif
361  #define dn_count_labels		__dn_count_labels
362  #define dn_skipname		__dn_skipname
363  #define fp_resstat		__fp_resstat
364  #define loc_aton		__loc_aton
365  #define loc_ntoa		__loc_ntoa
366  #define p_cdname		__p_cdname
367  #define p_cdnname		__p_cdnname
368  #define p_class			__p_class
369  #define p_fqname		__p_fqname
370  #define p_fqnname		__p_fqnname
371  #define p_option		__p_option
372  #define p_secstodate		__p_secstodate
373  #define p_section		__p_section
374  #define p_time			__p_time
375  #define p_type			__p_type
376  #define p_rcode			__p_rcode
377  #define p_sockun		__p_sockun
378  #define putlong			__putlong
379  #define putshort		__putshort
380  #define res_dnok		__res_dnok
381  #define res_findzonecut		__res_findzonecut
382  #define res_findzonecut2	__res_findzonecut2
383  #define res_hnok		__res_hnok
384  #define res_hostalias		__res_hostalias
385  #define res_mailok		__res_mailok
386  #define res_nameinquery		__res_nameinquery
387  #define res_nclose		__res_nclose
388  #define res_ninit		__res_ninit
389  #define res_nmkquery		__res_nmkquery
390  #define res_pquery		__res_pquery
391  #define res_nquery		__res_nquery
392  #define res_nquerydomain	__res_nquerydomain
393  #define res_nsearch		__res_nsearch
394  #define res_nsend		__res_nsend
395  #define res_nsendsigned		__res_nsendsigned
396  #define res_nisourserver	__res_nisourserver
397  #define res_ownok		__res_ownok
398  #define res_queriesmatch	__res_queriesmatch
399  #define sym_ntop		__sym_ntop
400  #define sym_ntos		__sym_ntos
401  #define sym_ston		__sym_ston
402  #define res_nopt		__res_nopt
403  #define res_ndestroy		__res_ndestroy
404  #define	res_nametoclass		__res_nametoclass
405  #define	res_nametotype		__res_nametotype
406  #define	res_setservers		__res_setservers
407  #define	res_getservers		__res_getservers
408  #define	res_buildprotolist	__res_buildprotolist
409  #define	res_destroyprotolist	__res_destroyprotolist
410  #define	res_destroyservicelist	__res_destroyservicelist
411  #define	res_get_nibblesuffix	__res_get_nibblesuffix
412  #define	res_get_nibblesuffix2	__res_get_nibblesuffix2
413  #define	res_ourserver_p		__res_ourserver_p
414  #define	res_protocolname	__res_protocolname
415  #define	res_protocolnumber	__res_protocolnumber
416  #define	res_send_setqhook	__res_send_setqhook
417  #define	res_send_setrhook	__res_send_setrhook
418  #define	res_servicename		__res_servicename
419  #define	res_servicenumber	__res_servicenumber
420  int		res_hnok(const char *);
421  int		res_ownok(const char *);
422  int		res_mailok(const char *);
423  int		res_dnok(const char *);
424  int		sym_ston(const struct res_sym *, const char *, int *);
425  const char *	sym_ntos(const struct res_sym *, int, int *);
426  const char *	sym_ntop(const struct res_sym *, int, int *);
427  #ifndef ANDROID_CHANGES
428  int		b64_ntop(u_char const *, size_t, char *, size_t);
429  int		b64_pton(char const *, u_char *, size_t);
430  #endif
431  int		loc_aton(const char *, u_char *);
432  const char *	loc_ntoa(const u_char *, char *, size_t);
433  int		dn_skipname(const u_char *, const u_char *);
434  void		putlong(uint32_t, u_char *);
435  void		putshort(uint16_t, u_char *);
436  #ifndef __ultrix__
437  uint16_t	_getshort(const u_char *);
438  uint32_t	_getlong(const u_char *);
439  #endif
440  const char *	p_class(int);
441  const char *	p_time(uint32_t);
442  const char *	p_type(int);
443  const char *	p_rcode(int);
444  __LIBC_HIDDEN__ const char *	p_sockun(union res_sockaddr_union, char *, size_t);
445  const u_char *	p_cdnname(const u_char *, const u_char *, int, FILE *);
446  const u_char *	p_cdname(const u_char *, const u_char *, FILE *);
447  const u_char *	p_fqnname(const u_char *, const u_char *,
448  			       int, char *, int);
449  const u_char *	p_fqname(const u_char *, const u_char *, FILE *);
450  const char *	p_option(u_long);
451  char *		p_secstodate(u_long);
452  int		dn_count_labels(const char *);
453  int		res_nameinquery(const char *, int, int, const u_char *,
454  				     const u_char *);
455  int		res_queriesmatch(const u_char *, const u_char *,
456  				      const u_char *, const u_char *);
457  __LIBC_HIDDEN__ const char *	p_section(int, int);
458  /* Things involving a resolver context. */
459  int		res_ninit(res_state);
460  int		res_nisourserver(const res_state, const struct sockaddr_in *);
461  void		fp_resstat(const res_state, FILE *);
462  __LIBC_HIDDEN__ void		res_pquery(const res_state, const u_char *, int, FILE *);
463  const char *	res_hostalias(const res_state, const char *, char *, size_t);
464  int		res_nquery(res_state, const char *, int, int, u_char *, int);
465  int		res_nsearch(res_state, const char *, int, int, u_char *, int);
466  int		res_nquerydomain(res_state, const char *, const char *,
467  				      int, int, u_char *, int);
468  int		res_nmkquery(res_state, int, const char *, int, int,
469  				  const u_char *, int, const u_char *,
470  				  u_char *, int);
471  int		res_nsend(res_state, const u_char *, int, u_char *, int);
472  int		res_nsendsigned(res_state, const u_char *, int,
473  				     ns_tsig_key *, u_char *, int);
474  int		res_findzonecut(res_state, const char *, ns_class, int,
475  				     char *, size_t, struct in_addr *, int);
476  int		res_findzonecut2(res_state, const char *, ns_class, int,
477  				      char *, size_t,
478  				      union res_sockaddr_union *, int);
479  void		res_nclose(res_state);
480  __LIBC_HIDDEN__ int		res_nopt(res_state, int, u_char *, int, int);
481  void		res_send_setqhook(res_send_qhook);
482  void		res_send_setrhook(res_send_rhook);
483  __LIBC_HIDDEN__ int		__res_vinit(res_state, int);
484  void		res_destroyservicelist(void);
485  const char *	res_servicename(uint16_t, const char *);
486  const char *	res_protocolname(int);
487  void		res_destroyprotolist(void);
488  void		res_buildprotolist(void);
489  __LIBC_HIDDEN__ const char *	res_get_nibblesuffix(res_state);
490  __LIBC_HIDDEN__ const char *	res_get_nibblesuffix2(res_state);
491  __LIBC_HIDDEN__ void		res_ndestroy(res_state);
492  __LIBC_HIDDEN__ uint16_t	res_nametoclass(const char *, int *);
493  __LIBC_HIDDEN__ uint16_t	res_nametotype(const char *, int *);
494  __LIBC_HIDDEN__ void		res_setservers(res_state,
495  				    const union res_sockaddr_union *, int);
496  __LIBC_HIDDEN__ int		res_getservers(res_state,
497  				    union res_sockaddr_union *, int);
498  
499  struct android_net_context; /* forward */
500  __LIBC_HIDDEN__ void res_setnetcontext(res_state, const struct android_net_context *);
501  
502  // We use the OpenBSD __res_randomid...
503  u_int __res_randomid(void);
504  // ...but NetBSD calls it res_randomid.
505  #define res_randomid __res_randomid
506  
507  #ifdef __i386__
508  # define __socketcall extern __attribute__((__cdecl__))
509  #else
510  # define __socketcall extern
511  #endif
512  
513  __socketcall int __connect(int, const struct sockaddr*, socklen_t);
514  
515  #undef __socketcall
516  
517  // Symbols that are supposed to be in resolv.h, but that we aren't exporting.
518  int ns_parserr2(ns_msg*, ns_sect, int, ns_rr2*);
519  int ns_name_pton2(const char*, u_char*, size_t, size_t*);
520  int ns_name_unpack2(const u_char*, const u_char*, const u_char*, u_char*, size_t, size_t*);
521  int ns_name_eq(ns_nname_ct, size_t, ns_nname_ct, size_t);
522  int ns_name_owned(ns_namemap_ct, int, ns_namemap_ct, int);
523  int ns_name_map(ns_nname_ct, size_t, ns_namemap_t, int);
524  int ns_name_labels(ns_nname_ct, size_t);
525  
526  __END_DECLS
527