-/* resolv.h: DNS Resolver
+/*
+ * Copyright (c) 1983, 1987, 1989
+ * The Regents of the University of California. All rights reserved.
*
- * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>,
- * The Silver Hammer Group, Ltd.
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
*
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
+ * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
+ * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
+ * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+ * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+ * SOFTWARE.
+ */
+
+/*
+ * @(#)resolv.h 8.1 (Berkeley) 6/2/93
+ * $BINDId: resolv.h,v 8.31 2000/03/30 20:16:50 vixie Exp $
*/
#ifndef _RESOLV_H_
-#define _RESOLV_H_
-#include <features.h>
+/* These headers are needed for types used in the `struct res_state'
+ declaration. */
+#include <sys/types.h>
+#include <netinet/in.h>
-#include <sys/param.h>
-#if (!defined(BSD)) || (BSD < 199306)
-# include <sys/bitypes.h>
-#else
-# include <sys/types.h>
+#ifndef __need_res_state
+# define _RESOLV_H_
+
+# include <sys/param.h>
+# include <sys/cdefs.h>
+# include <stdio.h>
+# include <arpa/nameser.h>
#endif
-#include <stdio.h>
-#include <netinet/in.h>
-struct resolv_header {
- int id;
- int qr,opcode,aa,tc,rd,ra,rcode;
- int qdcount;
- int ancount;
- int nscount;
- int arcount;
-};
+#ifndef __res_state_defined
+# define __res_state_defined
+
+typedef enum { res_goahead, res_nextns, res_modified, res_done, res_error }
+ res_sendhookact;
+
+typedef res_sendhookact (*res_send_qhook) (struct sockaddr_in * const *ns,
+ const u_char **query,
+ int *querylen,
+ u_char *ans,
+ int anssiz,
+ int *resplen);
+
+typedef res_sendhookact (*res_send_rhook) (const struct sockaddr_in *ns,
+ const u_char *query,
+ int querylen,
+ u_char *ans,
+ int anssiz,
+ int *resplen);
+
+/*
+ * Global defines and variables for resolver stub.
+ */
+# define MAXNS 3 /* max # name servers we'll track */
+# define MAXDFLSRCH 3 /* # default domain levels to try */
+# define MAXDNSRCH 6 /* max # domains in search path */
+# define LOCALDOMAINPARTS 2 /* min levels in name that is "local" */
-struct resolv_question {
- char * dotted;
- int qtype;
- int qclass;
+# define RES_TIMEOUT 5 /* min. seconds between retries */
+# define MAXRESOLVSORT 10 /* number of net to sort on */
+# define RES_MAXNDOTS 15 /* should reflect bit field size */
+# define RES_MAXRETRANS 30 /* only for resolv.conf/RES_OPTIONS */
+# define RES_MAXRETRY 5 /* only for resolv.conf/RES_OPTIONS */
+# define RES_DFLRETRY 3 /* Default #/tries. */
+/* (glibc uses RES_DFLRETRY of 2 but also does _res.retry = 4 sometimes (!) */
+# define RES_MAXTIME 65535 /* Infinity, in milliseconds. */
+
+/* _res (an instance of this structure) uses 0.5kb in bss
+ * in "ordinary" libc's (glibc, xBSD). We want to be less wasteful.
+ * We (1) shuffle and shrink some integer fields,
+ * and (2) can switch off stuff we don't support.
+ * Everything inside __UCLIBC_HAS_COMPAT_RES_STATE__
+ * is not actually used by uclibc and can be configured off.
+ * However, this will prevent some programs from building.
+ * Really obscure stuff with no observed users in the wild is under
+ * __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__.
+ * I guess it's safe to set that to N.
+ */
+struct __res_state {
+ /*int retrans, retry; - moved, was here */
+ u_int32_t options; /* (was: ulong) option flags - see below. */
+ struct sockaddr_in nsaddr_list[MAXNS]; /* address of name server */
+#define nsaddr nsaddr_list[0] /* for backward compatibility */
+ char *dnsrch[MAXDNSRCH + 1]; /* components of domain to search */
+ /*char defdname[256]; - moved, was here */
+ u_int8_t nscount; /* (was: int) number of name servers */
+ u_int8_t ndots; /* (was: unsigned:4) threshold for initial abs. query */
+ u_int8_t retrans; /* (was: int) retransmission time interval */
+ u_int8_t retry; /* (was: int) number of times to retransmit */
+#ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
+ /* googling for "_res.defdname" says it's still sometimes used.
+ * Pity. It's huge, I want to move it to EXTRA_COMPAT... */
+ char defdname[256]; /* default domain (deprecated) */
+ u_int8_t nsort; /* (was: unsigned:4) number of elements in sort_list[] */
+ u_int16_t pfcode; /* (was: ulong) RES_PRF_ flags. Used by dig. */
+ unsigned short id; /* current message id */
+ int res_h_errno; /* last one set for this context */
+ struct {
+ struct in_addr addr;
+ u_int32_t mask;
+ } sort_list[MAXRESOLVSORT];
+#endif
+
+ /* I assume that the intention is to store all
+ * DNS servers' addresses here, and duplicate in nsaddr_list[]
+ * those which have IPv4 address. In the case of IPv4 address
+ * _u._ext.nsaddrs[x] will point to some nsaddr_list[y],
+ * otherwise it will point into malloc'ed sockaddr_in6.
+ * nscount is the number of IPv4 addresses and _u._ext.nscount
+ * is the number of addresses of all kinds.
+ *
+ * If this differs from established usage and you need
+ * to change this, please describe how it is supposed to work.
+ */
+ union {
+ struct {
+#ifdef __UCLIBC_HAS_IPV6__
+ struct sockaddr_in6 *nsaddrs[MAXNS];
+#endif
+ u_int8_t nscount; /* (was: u_int16_t) */
+#ifdef __UCLIBC_HAS_COMPAT_RES_STATE__
+ /* rather obscure, and differs in BSD and glibc */
+ u_int16_t nstimes[MAXNS];
+ int nssocks[MAXNS];
+ u_int16_t nscount6;
+ u_int16_t nsinit;
+ /* glibc also has: */
+ /*u_int16_t nsmap[MAXNS];*/
+ /*unsigned long long initstamp;*/
+#endif
+ } _ext;
+ } _u;
+
+#ifdef __UCLIBC_HAS_EXTRA_COMPAT_RES_STATE__
+ /* Truly obscure stuff.
+ * Googling for "_res.XXX" for these members
+ * turned up basically empty */
+ res_send_qhook qhook; /* query hook */
+ res_send_rhook rhook; /* response hook */
+ int _vcsock; /* PRIVATE: for res_send VC i/o */
+ unsigned _flags; /* PRIVATE: see below */
+#endif
};
-struct resolv_answer {
- char * dotted;
- int atype;
- int aclass;
- int ttl;
- int rdlength;
- unsigned char * rdata;
- int rdoffset;
+typedef struct __res_state *res_state;
+# undef __need_res_state
+#endif
+
+#ifdef _RESOLV_H_
+/*
+ * Revision information. This is the release date in YYYYMMDD format.
+ * It can change every day so the right thing to do with it is use it
+ * in preprocessor commands such as "#if (__RES > 19931104)". Do not
+ * compare for equality; rather, use it to determine whether your resolver
+ * is new enough to contain a certain feature.
+ */
+
+#if 0
+#define __RES 19991006
+#else
+#define __RES 19960801
+#endif
+
+/*
+ * Resolver configuration file.
+ * Normally not present, but may contain the address of the
+ * inital name server(s) to query and the domain search list.
+ */
+
+#ifndef _PATH_RESCONF
+#define _PATH_RESCONF "/etc/resolv.conf"
+#endif
+
+struct res_sym {
+ int number; /* Identifying number, like T_MX */
+ char * name; /* Its symbolic name, like "MX" */
+ char * humanname; /* Its fun name, like "mail exchanger" */
};
-int encode_header(struct resolv_header * h, unsigned char * dest, int maxlen);
-int decode_header(unsigned char * data, struct resolv_header * h);
-int encode_dotted(const char * dotted, unsigned char * dest, int maxlen);
-int decode_dotted(const unsigned char * message, int offset,
- char * dest, int maxlen);
-int length_dotted(const unsigned char * message, int offset);
-int encode_question(struct resolv_question * q,
- unsigned char * dest, int maxlen);
-int decode_question(unsigned char * message, int offset,
- struct resolv_question * q);
-int length_question(unsigned char * message, int offset);
-int encode_answer(struct resolv_answer * a,
- unsigned char * dest, int maxlen);
-int decode_answer(unsigned char * message, int offset,
- struct resolv_answer * a);
-const char * resolve_name(const char * name, int mailbox);
-
-int encode_packet(struct resolv_header * h,
- struct resolv_question ** q,
- struct resolv_answer ** an,
- struct resolv_answer ** ns,
- struct resolv_answer ** ar,
- unsigned char * dest, int maxlen);
-int decode_packet(unsigned char * data, struct resolv_header * h);
-
-int dns_lookup(const char * name, int type, int nscount, const char ** nsip,
- unsigned char ** outpacket, struct resolv_answer * a);
-
-int resolve_address(const char * address,
- int nscount, const char ** nsip,
- struct in_addr * in);
-
-int resolve_mailbox(const char * address,
- int nscount, const char ** nsip,
- struct in_addr * in);
-
-extern int open_nameservers(void);
-extern void close_nameservers(void);
-
-extern struct hostent * gethostbyname(const char * name);
-extern struct hostent * gethostbyaddr(const char * addr, int len, int type);
-
-#endif /*_RESOLV_H_*/
+/*
+ * Resolver flags (used to be discrete per-module statics ints).
+ */
+#define RES_F_VC 0x00000001 /* socket is TCP */
+#define RES_F_CONN 0x00000002 /* socket is connected */
+
+/* res_findzonecut() options */
+#define RES_EXHAUSTIVE 0x00000001 /* always do all queries */
+
+/*
+ * Resolver options (keep these in synch with res_debug.c, please)
+ * (which of these do we really implement??)
+ */
+#define RES_INIT 0x00000001 /* address initialized */
+#define RES_DEBUG 0x00000002 /* print debug messages */
+#define RES_AAONLY 0x00000004 /* authoritative answers only (!IMPL)*/
+#define RES_USEVC 0x00000008 /* use virtual circuit */
+#define RES_PRIMARY 0x00000010 /* query primary server only (!IMPL) */
+#define RES_IGNTC 0x00000020 /* ignore trucation errors */
+#define RES_RECURSE 0x00000040 /* recursion desired */
+#define RES_DEFNAMES 0x00000080 /* use default domain name */
+#define RES_STAYOPEN 0x00000100 /* Keep TCP socket open */
+#define RES_DNSRCH 0x00000200 /* search up local domain tree */
+#define RES_INSECURE1 0x00000400 /* type 1 security disabled */
+#define RES_INSECURE2 0x00000800 /* type 2 security disabled */
+#define RES_NOALIASES 0x00001000 /* shuts off HOSTALIASES feature */
+#define RES_USE_INET6 0x00002000 /* use/map IPv6 in gethostbyname() */
+#define RES_ROTATE 0x00004000 /* rotate ns list after each query */
+#define RES_NOCHECKNAME 0x00008000 /* do not check names for sanity. */
+#define RES_KEEPTSIG 0x00010000 /* do not strip TSIG records */
+#define RES_BLAST 0x00020000 /* blast all recursive servers */
+#if 0
+#define RES_USEBSTRING 0x00040000 /* IPv6 reverse lookup with byte
+ strings */
+#define RES_NOIP6DOTINT 0x00080000 /* Do not use .ip6.int in IPv6
+ reverse lookup */
+
+#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH|RES_NOIP6DOTINT)
+#else
+#define RES_DEFAULT (RES_RECURSE|RES_DEFNAMES|RES_DNSRCH)
+#endif
+
+/*
+ * Resolver "pfcode" values. Used by dig.
+ */
+#define RES_PRF_STATS 0x00000001
+#define RES_PRF_UPDATE 0x00000002
+#define RES_PRF_CLASS 0x00000004
+#define RES_PRF_CMD 0x00000008
+#define RES_PRF_QUES 0x00000010
+#define RES_PRF_ANS 0x00000020
+#define RES_PRF_AUTH 0x00000040
+#define RES_PRF_ADD 0x00000080
+#define RES_PRF_HEAD1 0x00000100
+#define RES_PRF_HEAD2 0x00000200
+#define RES_PRF_TTLID 0x00000400
+#define RES_PRF_HEADX 0x00000800
+#define RES_PRF_QUERY 0x00001000
+#define RES_PRF_REPLY 0x00002000
+#define RES_PRF_INIT 0x00004000
+/* 0x00008000 */
+
+/* Things involving an internal (static) resolver context. */
+__BEGIN_DECLS
+extern struct __res_state *__res_state(void) __attribute__ ((__const__));
+__END_DECLS
+#define _res (*__res_state())
+
+#if 0
+#define fp_nquery __fp_nquery
+#define fp_query __fp_query
+#define hostalias __hostalias
+#define p_query __p_query
+#endif
+#define res_close __res_close
+#define res_init __res_init
+#if 0
+#define res_isourserver __res_isourserver
+#endif
+#define res_mkquery __res_mkquery
+#define res_query __res_query
+#define res_querydomain __res_querydomain
+#define res_search __res_search
+#if 0
+#define res_send __res_send
+#endif
+
+__BEGIN_DECLS
+#if 0
+void fp_nquery (const u_char *, int, FILE *) __THROW;
+void fp_query (const u_char *, FILE *) __THROW;
+const char * hostalias (const char *) __THROW;
+void p_query (const u_char *) __THROW;
+#endif
+#ifdef __UCLIBC_HAS_BSD_RES_CLOSE__
+void res_close (void) __THROW;
+#endif
+int res_init (void) __THROW;
+libc_hidden_proto(res_init)
+#if 0
+int res_isourserver (const struct sockaddr_in *) __THROW;
+#endif
+int res_mkquery (int, const char *, int, int, const u_char *,
+ int, const u_char *, u_char *, int) __THROW;
+int res_query (const char *, int, int, u_char *, int) __THROW;
+libc_hidden_proto(res_query)
+int res_querydomain (const char *, const char *, int, int,
+ u_char *, int) __THROW;
+libc_hidden_proto(res_querydomain)
+int res_search (const char *, int, int, u_char *, int) __THROW;
+#if 0
+int res_send (const u_char *, int, u_char *, int) __THROW;
+#endif
+__END_DECLS
+
+#if 0
+#define b64_ntop __b64_ntop
+#define b64_pton __b64_pton
+#define dn_count_labels __dn_count_labels
+#endif
+#define dn_comp __dn_comp
+#define dn_expand __dn_expand
+#define dn_skipname __dn_skipname
+#define res_ninit __res_ninit
+#define res_nclose __res_nclose
+#if 0
+#define fp_resstat __fp_resstat
+#define loc_aton __loc_aton
+#define loc_ntoa __loc_ntoa
+#define p_cdname __p_cdname
+#define p_cdnname __p_cdnname
+#define p_class __p_class
+#define p_fqname __p_fqname
+#define p_fqnname __p_fqnname
+#define p_option __p_option
+#define p_secstodate __p_secstodate
+#define p_section __p_section
+#define p_time __p_time
+#define p_type __p_type
+#define p_rcode __p_rcode
+#define putlong __putlong
+#define putshort __putshort
+#define res_dnok __res_dnok
+#define res_hnok __res_hnok
+#define res_hostalias __res_hostalias
+#define res_mailok __res_mailok
+#define res_nameinquery __res_nameinquery
+#define res_nmkquery __res_nmkquery
+#define res_npquery __res_npquery
+#define res_nquery __res_nquery
+#define res_nquerydomain __res_nquerydomain
+#define res_nsearch __res_nsearch
+#define res_nsend __res_nsend
+#define res_nisourserver __res_nisourserver
+#define res_ownok __res_ownok
+#define res_queriesmatch __res_queriesmatch
+#define res_randomid __res_randomid
+#define sym_ntop __sym_ntop
+#define sym_ntos __sym_ntos
+#define sym_ston __sym_ston
+#endif
+__BEGIN_DECLS
+#if 0
+int res_hnok (const char *) __THROW;
+int res_ownok (const char *) __THROW;
+int res_mailok (const char *) __THROW;
+int res_dnok (const char *) __THROW;
+int sym_ston (const struct res_sym *, const char *, int *) __THROW;
+const char * sym_ntos (const struct res_sym *, int, int *) __THROW;
+const char * sym_ntop (const struct res_sym *, int, int *) __THROW;
+int b64_ntop (u_char const *, size_t, char *, size_t) __THROW;
+int b64_pton (char const *, u_char *, size_t) __THROW;
+int loc_aton (const char *ascii, u_char *binary) __THROW;
+const char * loc_ntoa (const u_char *binary, char *ascii) __THROW;
+void putlong (u_int32_t, u_char *) __THROW;
+void putshort (u_int16_t, u_char *) __THROW;
+const char * p_class (int) __THROW;
+const char * p_time (u_int32_t) __THROW;
+const char * p_type (int) __THROW;
+const char * p_rcode (int) __THROW;
+const u_char * p_cdnname (const u_char *, const u_char *, int, FILE *)
+ __THROW;
+const u_char * p_cdname (const u_char *, const u_char *, FILE *) __THROW;
+const u_char * p_fqnname (const u_char *cp, const u_char *msg,
+ int, char *, int) __THROW;
+const u_char * p_fqname (const u_char *, const u_char *, FILE *) __THROW;
+const char * p_option (u_long option) __THROW;
+char * p_secstodate (u_long) __THROW;
+int dn_count_labels (const char *) __THROW;
+#endif
+int dn_skipname (const u_char *, const u_char *) __THROW;
+libc_hidden_proto(dn_skipname)
+int dn_comp (const char *, u_char *, int, u_char **, u_char **)
+ __THROW;
+libc_hidden_proto(dn_comp)
+int dn_expand (const u_char *, const u_char *, const u_char *,
+ char *, int) __THROW;
+libc_hidden_proto(dn_expand)
+int res_ninit (res_state) __THROW;
+void res_nclose (res_state) __THROW;
+#if 0
+u_int res_randomid (void) __THROW;
+int res_nameinquery (const char *, int, int,
+ const u_char *, const u_char *) __THROW;
+int res_queriesmatch (const u_char *, const u_char *,
+ const u_char *, const u_char *) __THROW;
+const char * p_section (int section, int opcode) __THROW;
+/* Things involving a resolver context. */
+int res_nisourserver (const res_state,
+ const struct sockaddr_in *) __THROW;
+void fp_resstat (const res_state, FILE *) __THROW;
+void res_npquery (const res_state, const u_char *, int, FILE *)
+ __THROW;
+const char * res_hostalias (const res_state, const char *, char *, size_t)
+ __THROW;
+int res_nquery (res_state, const char *, int, int, u_char *, int)
+ __THROW;
+int res_nsearch (res_state, const char *, int, int, u_char *, int)
+ __THROW;
+int res_nquerydomain (res_state, const char *, const char *, int,
+ int, u_char *, int) __THROW;
+int res_nmkquery (res_state, int, const char *, int, int,
+ const u_char *, int, const u_char *, u_char *,
+ int) __THROW;
+int res_nsend (res_state, const u_char *, int, u_char *, int)
+ __THROW;
+#endif
+__END_DECLS
+
+# if _LIBC
+# ifdef __UCLIBC_HAS_THREADS__
+# if defined __UCLIBC_HAS_TLS__ \
+ && (!defined NOT_IN_libc || defined IS_IN_libpthread)
+# undef _res
+# ifndef NOT_IN_libc
+# define __resp __libc_resp
+# endif
+# define _res (*__resp)
+extern __thread struct __res_state *__resp attribute_tls_model_ie;
+# endif
+# else
+# undef _res
+# define _res (*__resp)
+extern struct __res_state *__resp;
+# endif /* __UCLIBC_HAS_THREADS__ */
+# endif /* _LIBC */
+
+#endif /* _RESOLV_H_ */
+
+#endif /* !_RESOLV_H_ */
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