328 lines
8.1 KiB
C
328 lines
8.1 KiB
C
/* $NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $ */
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/*
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* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
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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 ISC DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
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* OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#ifdef notdef
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static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp";
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#else
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__RCSID("$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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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_private.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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__LIBC_HIDDEN__
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const char * const _res_opcodes[] = {
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"QUERY",
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"IQUERY",
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"CQUERYM",
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"CQUERYU", /* experimental */
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"NOTIFY", /* experimental */
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"UPDATE",
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"6",
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"7",
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"8",
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"9",
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"10",
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"11",
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"12",
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"13",
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"ZONEINIT",
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"ZONEREF",
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};
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#ifdef BIND_UPDATE
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const char * const _res_sectioncodes[] = {
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"ZONE",
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"PREREQUISITES",
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"UPDATE",
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"ADDITIONAL",
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};
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#endif
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#ifndef __BIND_NOSTATIC
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extern struct __res_state _nres;
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/* Proto. */
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int res_ourserver_p(const res_state, const struct sockaddr *);
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#define res_need_init() ((_nres.options & RES_INIT) == 0U)
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int
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res_init(void) {
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int rv;
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extern int __res_vinit(res_state, int);
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#ifdef COMPAT__RES
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/*
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* Compatibility with program that were accessing _res directly
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* to set options. We keep another struct res that is the same
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* size as the original res structure, and then copy fields to
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* it so that we achieve the same initialization
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*/
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extern void *__res_get_old_state(void);
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extern void __res_put_old_state(void *);
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res_state ores = __res_get_old_state();
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if (ores->options != 0)
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_nres.options = ores->options;
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if (ores->retrans != 0)
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_nres.retrans = ores->retrans;
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if (ores->retry != 0)
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_nres.retry = ores->retry;
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#endif
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/*
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* These three fields used to be statically initialized. This made
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* it hard to use this code in a shared library. It is necessary,
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* now that we're doing dynamic initialization here, that we preserve
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* the old semantics: if an application modifies one of these three
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* fields of _res before res_init() is called, res_init() will not
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* alter them. Of course, if an application is setting them to
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* _zero_ before calling res_init(), hoping to override what used
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* to be the static default, we can't detect it and unexpected results
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* will follow. Zero for any of these fields would make no sense,
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* so one can safely assume that the applications were already getting
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* unexpected results.
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*
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* _nres.options is tricky since some apps were known to diddle the bits
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* before res_init() was first called. We can't replicate that semantic
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* with dynamic initialization (they may have turned bits off that are
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* set in RES_DEFAULT). Our solution is to declare such applications
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* "broken". They could fool us by setting RES_INIT but none do (yet).
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*/
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if (!_nres.retrans)
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_nres.retrans = RES_TIMEOUT;
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if (!_nres.retry)
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_nres.retry = 4;
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if (!(_nres.options & RES_INIT))
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_nres.options = RES_DEFAULT;
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/*
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* This one used to initialize implicitly to zero, so unless the app
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* has set it to something in particular, we can randomize it now.
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*/
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if (!_nres.id)
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_nres.id = res_randomid();
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rv = __res_vinit(&_nres, 1);
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#ifdef COMPAT__RES
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__res_put_old_state(&_nres);
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#endif
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return rv;
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}
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void
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p_query(const u_char *msg) {
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fp_query(msg, stdout);
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}
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void
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fp_query(const u_char *msg, FILE *file) {
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fp_nquery(msg, PACKETSZ, file);
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}
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void
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fp_nquery(const u_char *msg, int len, FILE *file) {
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if (res_need_init() && res_init() == -1)
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return;
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res_pquery(&_nres, msg, len, file);
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}
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int
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res_mkquery(int op, /* opcode of query */
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const char *dname, /* domain name */
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int class, int type, /* class and type of query */
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const u_char *data, /* resource record data */
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int datalen, /* length of data */
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const u_char *newrr_in, /* new rr for modify or append */
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u_char *buf, /* buffer to put query */
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int buflen) /* size of buffer */
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{
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if (res_need_init() && res_init() == -1) {
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RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nmkquery(&_nres, op, dname, class, type,
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data, datalen,
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newrr_in, buf, buflen));
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}
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#ifdef _LIBRESOLV
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int
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res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
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if (res_need_init() && res_init() == -1) {
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RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nmkupdate(&_nres, rrecp_in, buf, buflen));
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}
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#endif
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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_need_init() && res_init() == -1) {
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RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nquery(&_nres, name, class, type, answer, anslen));
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}
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void
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res_send_setqhook(res_send_qhook hook) {
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_nres.qhook = hook;
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}
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void
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res_send_setrhook(res_send_rhook hook) {
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_nres.rhook = hook;
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}
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int
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res_isourserver(const struct sockaddr_in *inp) {
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return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));
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}
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int
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res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
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if (res_need_init() && res_init() == -1) {
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/* errno should have been set by res_init() in this case. */
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return (-1);
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}
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return (res_nsend(&_nres, buf, buflen, ans, anssiz));
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}
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#ifdef _LIBRESOLV
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int
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res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
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u_char *ans, int anssiz)
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{
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if (res_need_init() && res_init() == -1) {
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/* errno should have been set by res_init() in this case. */
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return (-1);
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}
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return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));
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}
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#endif
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void
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res_close(void) {
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res_nclose(&_nres);
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}
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#ifdef _LIBRESOLV
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int
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res_update(ns_updrec *rrecp_in) {
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if (res_need_init() && res_init() == -1) {
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RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nupdate(&_nres, rrecp_in, NULL));
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}
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#endif
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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_need_init() && res_init() == -1) {
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RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nsearch(&_nres, 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_need_init() && res_init() == -1) {
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RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
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return (-1);
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}
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return (res_nquerydomain(&_nres, name, domain,
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class, type,
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answer, anslen));
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}
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int
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res_opt(int a, u_char *b, int c, int d)
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{
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return res_nopt(&_nres, a, b, c, d);
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}
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const char *
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hostalias(const char *name) {
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return NULL;
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}
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#ifdef ultrix
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int
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local_hostname_length(const char *hostname) {
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int len_host, len_domain;
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if (!*_nres.defdname)
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res_init();
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len_host = strlen(hostname);
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len_domain = strlen(_nres.defdname);
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if (len_host > len_domain &&
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!strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&
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hostname[len_host - len_domain - 1] == '.')
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return (len_host - len_domain - 1);
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return (0);
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}
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#endif /*ultrix*/
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#endif
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