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115 lines
3.2 KiB
C
115 lines
3.2 KiB
C
/*
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* Copyright (c) 1995-1999 by Internet Software Consortium.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
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* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
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* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
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* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
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* SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <arpa/nameser.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <resolv.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int
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res_query(const char *name, /* domain name */
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int class, int type, /* class and type of query */
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u_char *answer, /* buffer to put answer */
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int anslen) /* size of answer buffer */
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{
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if (__res_maybe_init (&_res, 1) == -1) {
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RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nquery(&_res, name, class, type, answer, anslen));
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}
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void
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res_close(void) {
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/*
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* Some stupid programs out there call res_close() before res_init().
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* Since _res._vcsock isn't explicitly initialized, these means that
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* we could do a close(0), which might lead to some security problems.
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* Therefore we check if res_init() was called before by looking at
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* the RES_INIT bit in _res.options. If it hasn't been set we bail out
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* early. */
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if ((_res.options & RES_INIT) == 0)
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return;
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/* We don't free the name server addresses because we never
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did it and it would be done implicitly on shutdown. */
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__res_iclose(&_res, false);
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}
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int
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res_search(const char *name, /* domain name */
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int class, int type, /* class and type of query */
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u_char *answer, /* buffer to put answer */
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int anslen) /* size of answer */
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{
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if (__res_maybe_init (&_res, 1) == -1) {
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RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nsearch(&_res, name, class, type, answer, anslen));
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}
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int
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res_querydomain(const char *name,
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const char *domain,
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int class, int type, /* class and type of query */
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u_char *answer, /* buffer to put answer */
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int anslen) /* size of answer */
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{
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if (__res_maybe_init (&_res, 1) == -1) {
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RES_SET_H_ERRNO(&_res, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nquerydomain(&_res, name, domain,
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class, type,
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answer, anslen));
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}
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const char *
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hostalias(const char *name) {
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static char abuf[MAXDNAME];
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return (res_hostalias(&_res, name, abuf, sizeof abuf));
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}
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libresolv_hidden_def (hostalias)
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#include <shlib-compat.h>
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#if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
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# undef res_query
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# undef res_querydomain
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# undef res_search
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weak_alias (__res_query, res_query);
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weak_alias (__res_querydomain, res_querydomain);
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weak_alias (__res_search, res_search);
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#endif
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