/* $NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $ */
/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Copyright (c) 1995-1999 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 ISC DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#ifdef notdef
static const char rcsid[] = "Id: res_data.c,v 1.1.206.2 2004/03/16 12:34:18 marka Exp";
#else
__RCSID("$NetBSD: res_data.c,v 1.8 2004/06/09 18:07:03 christos Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "arpa_nameser.h"
#include <ctype.h>
#include <netdb.h>
#include "resolv_private.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
__LIBC_HIDDEN__
const char * const _res_opcodes[] = {
"QUERY",
"IQUERY",
"CQUERYM",
"CQUERYU", /* experimental */
"NOTIFY", /* experimental */
"UPDATE",
"6",
"7",
"8",
"9",
"10",
"11",
"12",
"13",
"ZONEINIT",
"ZONEREF",
};
#ifdef BIND_UPDATE
const char * const _res_sectioncodes[] = {
"ZONE",
"PREREQUISITES",
"UPDATE",
"ADDITIONAL",
};
#endif
#ifndef __BIND_NOSTATIC
extern struct __res_state _nres;
/* Proto. */
int res_ourserver_p(const res_state, const struct sockaddr *);
#define res_need_init() ((_nres.options & RES_INIT) == 0U)
int
res_init(void) {
int rv;
extern int __res_vinit(res_state, int);
#ifdef COMPAT__RES
/*
* Compatibility with program that were accessing _res directly
* to set options. We keep another struct res that is the same
* size as the original res structure, and then copy fields to
* it so that we achieve the same initialization
*/
extern void *__res_get_old_state(void);
extern void __res_put_old_state(void *);
res_state ores = __res_get_old_state();
if (ores->options != 0)
_nres.options = ores->options;
if (ores->retrans != 0)
_nres.retrans = ores->retrans;
if (ores->retry != 0)
_nres.retry = ores->retry;
#endif
/*
* These three fields used to be statically initialized. This made
* it hard to use this code in a shared library. It is necessary,
* now that we're doing dynamic initialization here, that we preserve
* the old semantics: if an application modifies one of these three
* fields of _res before res_init() is called, res_init() will not
* alter them. Of course, if an application is setting them to
* _zero_ before calling res_init(), hoping to override what used
* to be the static default, we can't detect it and unexpected results
* will follow. Zero for any of these fields would make no sense,
* so one can safely assume that the applications were already getting
* unexpected results.
*
* _nres.options is tricky since some apps were known to diddle the bits
* before res_init() was first called. We can't replicate that semantic
* with dynamic initialization (they may have turned bits off that are
* set in RES_DEFAULT). Our solution is to declare such applications
* "broken". They could fool us by setting RES_INIT but none do (yet).
*/
if (!_nres.retrans)
_nres.retrans = RES_TIMEOUT;
if (!_nres.retry)
_nres.retry = 4;
if (!(_nres.options & RES_INIT))
_nres.options = RES_DEFAULT;
/*
* This one used to initialize implicitly to zero, so unless the app
* has set it to something in particular, we can randomize it now.
*/
if (!_nres.id)
_nres.id = res_randomid();
rv = __res_vinit(&_nres, 1);
#ifdef COMPAT__RES
__res_put_old_state(&_nres);
#endif
return rv;
}
void
p_query(const u_char *msg) {
fp_query(msg, stdout);
}
void
fp_query(const u_char *msg, FILE *file) {
fp_nquery(msg, PACKETSZ, file);
}
void
fp_nquery(const u_char *msg, int len, FILE *file) {
if (res_need_init() && res_init() == -1)
return;
res_pquery(&_nres, msg, len, file);
}
int
res_mkquery(int op, /* opcode of query */
const char *dname, /* domain name */
int class, int type, /* class and type of query */
const u_char *data, /* resource record data */
int datalen, /* length of data */
const u_char *newrr_in, /* new rr for modify or append */
u_char *buf, /* buffer to put query */
int buflen) /* size of buffer */
{
if (res_need_init() && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nmkquery(&_nres, op, dname, class, type,
data, datalen,
newrr_in, buf, buflen));
}
#ifdef _LIBRESOLV
int
res_mkupdate(ns_updrec *rrecp_in, u_char *buf, int buflen) {
if (res_need_init() && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nmkupdate(&_nres, rrecp_in, buf, buflen));
}
#endif
int
res_query(const char *name, /* domain name */
int class, int type, /* class and type of query */
u_char *answer, /* buffer to put answer */
int anslen) /* size of answer buffer */
{
if (res_need_init() && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nquery(&_nres, name, class, type, answer, anslen));
}
void
res_send_setqhook(res_send_qhook hook) {
_nres.qhook = hook;
}
void
res_send_setrhook(res_send_rhook hook) {
_nres.rhook = hook;
}
int
res_isourserver(const struct sockaddr_in *inp) {
return (res_ourserver_p(&_nres, (const struct sockaddr *)(const void *)inp));
}
int
res_send(const u_char *buf, int buflen, u_char *ans, int anssiz) {
if (res_need_init() && res_init() == -1) {
/* errno should have been set by res_init() in this case. */
return (-1);
}
return (res_nsend(&_nres, buf, buflen, ans, anssiz));
}
#ifdef _LIBRESOLV
int
res_sendsigned(const u_char *buf, int buflen, ns_tsig_key *key,
u_char *ans, int anssiz)
{
if (res_need_init() && res_init() == -1) {
/* errno should have been set by res_init() in this case. */
return (-1);
}
return (res_nsendsigned(&_nres, buf, buflen, key, ans, anssiz));
}
#endif
void
res_close(void) {
res_nclose(&_nres);
}
#ifdef _LIBRESOLV
int
res_update(ns_updrec *rrecp_in) {
if (res_need_init() && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nupdate(&_nres, rrecp_in, NULL));
}
#endif
int
res_search(const char *name, /* domain name */
int class, int type, /* class and type of query */
u_char *answer, /* buffer to put answer */
int anslen) /* size of answer */
{
if (res_need_init() && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nsearch(&_nres, name, class, type, answer, anslen));
}
int
res_querydomain(const char *name,
const char *domain,
int class, int type, /* class and type of query */
u_char *answer, /* buffer to put answer */
int anslen) /* size of answer */
{
if (res_need_init() && res_init() == -1) {
RES_SET_H_ERRNO(&_nres, NETDB_INTERNAL);
return (-1);
}
return (res_nquerydomain(&_nres, name, domain,
class, type,
answer, anslen));
}
int
res_opt(int a, u_char *b, int c, int d)
{
return res_nopt(&_nres, a, b, c, d);
}
const char *
hostalias(const char *name) {
return NULL;
}
#ifdef ultrix
int
local_hostname_length(const char *hostname) {
int len_host, len_domain;
if (!*_nres.defdname)
res_init();
len_host = strlen(hostname);
len_domain = strlen(_nres.defdname);
if (len_host > len_domain &&
!strcasecmp(hostname + len_host - len_domain, _nres.defdname) &&
hostname[len_host - len_domain - 1] == '.')
return (len_host - len_domain - 1);
return (0);
}
#endif /*ultrix*/
#endif