332 lines
8.4 KiB
C
332 lines
8.4 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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#if defined(LIBC_SCCS) && !defined(lint)
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static const char rcsid[] = "$BINDId: res_data.c,v 8.17 1999/10/13 17:11:31 vixie Exp $";
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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.h>
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#ifdef BIND_UPDATE
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#include <res_update.h>
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#endif
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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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#undef _res
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const char *_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 *_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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#ifdef _LIBC
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extern struct __res_state _res;
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#else
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/* The definition has been moved to res_libc.c. */
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struct __res_state _res
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# if defined(__BIND_RES_TEXT)
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= { RES_TIMEOUT, } /* Motorola, et al. */
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# endif
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;
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#endif
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/* Proto. */
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int res_ourserver_p(const res_state, const struct sockaddr_in *);
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void res_pquery(const res_state, const u_char *, int, FILE *);
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#ifndef _LIBC
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/* Moved to res_libc.c since res_init() should go into libc.so but the
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rest of this file not. */
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int
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res_init(void) {
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extern int __res_vinit(res_state, int);
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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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* _res.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 (!_res.retrans)
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_res.retrans = RES_TIMEOUT;
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if (!_res.retry)
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_res.retry = 4;
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if (!(_res.options & RES_INIT))
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_res.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 (!_res.id)
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_res.id = res_randomid();
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return (__res_vinit(&_res, 1));
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}
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#endif
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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.options & RES_INIT) == 0 && res_init() == -1)
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return;
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res_pquery(&_res, 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.options & RES_INIT) == 0 && res_init() == -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_nmkquery(&_res, 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 BIND_UPDATE
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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.options & RES_INIT) == 0 && res_init() == -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_nmkupdate(&_res, 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.options & RES_INIT) == 0 && res_init() == -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_send_setqhook(res_send_qhook hook) {
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_res.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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_res.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(&_res, 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.options & RES_INIT) == 0 && 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(&_res, buf, buflen, ans, anssiz));
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}
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#ifndef _LIBC
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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.options & RES_INIT) == 0 && 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(&_res, 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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#ifdef _LIBC
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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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#endif
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res_nclose(&_res);
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}
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#ifdef BIND_UPDATE
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int
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res_update(ns_updrec *rrecp_in) {
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if ((_res.options & RES_INIT) == 0 && res_init() == -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_nupdate(&_res, 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.options & RES_INIT) == 0 && res_init() == -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.options & RES_INIT) == 0 && res_init() == -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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#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 (!*_res.defdname)
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res_init();
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len_host = strlen(hostname);
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len_domain = strlen(_res.defdname);
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if (len_host > len_domain &&
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!strcasecmp(hostname + len_host - len_domain, _res.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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#include <shlib-compat.h>
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#if SHLIB_COMPAT(libresolv, GLIBC_2_0, GLIBC_2_2)
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# undef res_mkquery
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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_mkquery, res_mkquery);
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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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