154 lines
3.6 KiB
C
154 lines
3.6 KiB
C
/* $NetBSD: dns.c,v 1.2 2001/01/27 07:22:03 itojun Exp $ */
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static const char rcsid[] = "Id: dns.c,v 1.15 2000/02/28 07:52:16 vixie Exp";
|
|
#endif
|
|
|
|
/*
|
|
* dns.c --- this is the top-level accessor function for the dns
|
|
*/
|
|
|
|
#include "port_before.h"
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <errno.h>
|
|
|
|
#include <sys/types.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/nameser.h>
|
|
#include <resolv.h>
|
|
|
|
#include <resolv.h>
|
|
|
|
#include <isc/memcluster.h>
|
|
#include <irs.h>
|
|
|
|
#include "port_after.h"
|
|
|
|
#include "irs_p.h"
|
|
#include "hesiod.h"
|
|
#include "dns_p.h"
|
|
|
|
/* forward */
|
|
|
|
static void dns_close(struct irs_acc *);
|
|
static struct __res_state * dns_res_get(struct irs_acc *);
|
|
static void dns_res_set(struct irs_acc *, struct __res_state *,
|
|
void (*)(void *));
|
|
|
|
/* public */
|
|
|
|
struct irs_acc *
|
|
irs_dns_acc(const char *options) {
|
|
struct irs_acc *acc;
|
|
struct dns_p *dns;
|
|
|
|
if (!(acc = memget(sizeof *acc))) {
|
|
errno = ENOMEM;
|
|
return (NULL);
|
|
}
|
|
memset(acc, 0x5e, sizeof *acc);
|
|
if (!(dns = memget(sizeof *dns))) {
|
|
errno = ENOMEM;
|
|
memput(acc, sizeof *acc);
|
|
return (NULL);
|
|
}
|
|
memset(dns, 0x5e, sizeof *dns);
|
|
dns->res = NULL;
|
|
dns->free_res = NULL;
|
|
if (hesiod_init(&dns->hes_ctx) < 0) {
|
|
/*
|
|
* We allow the dns accessor class to initialize
|
|
* despite hesiod failing to initialize correctly,
|
|
* since dns host queries don't depend on hesiod.
|
|
*/
|
|
dns->hes_ctx = NULL;
|
|
}
|
|
acc->private = dns;
|
|
#ifdef WANT_IRS_GR
|
|
acc->gr_map = irs_dns_gr;
|
|
#else
|
|
acc->gr_map = NULL;
|
|
#endif
|
|
#ifdef WANT_IRS_PW
|
|
acc->pw_map = irs_dns_pw;
|
|
#else
|
|
acc->pw_map = NULL;
|
|
#endif
|
|
acc->sv_map = irs_dns_sv;
|
|
acc->pr_map = irs_dns_pr;
|
|
acc->ho_map = irs_dns_ho;
|
|
acc->nw_map = irs_dns_nw;
|
|
acc->ng_map = irs_nul_ng;
|
|
acc->res_get = dns_res_get;
|
|
acc->res_set = dns_res_set;
|
|
acc->close = dns_close;
|
|
return (acc);
|
|
}
|
|
|
|
/* methods */
|
|
static struct __res_state *
|
|
dns_res_get(struct irs_acc *this) {
|
|
struct dns_p *dns = (struct dns_p *)this->private;
|
|
|
|
if (dns->res == NULL) {
|
|
struct __res_state *res;
|
|
res = (struct __res_state *)malloc(sizeof *res);
|
|
if (res == NULL)
|
|
return (NULL);
|
|
memset(dns->res, 0, sizeof *dns->res);
|
|
dns_res_set(this, res, free);
|
|
}
|
|
|
|
if ((dns->res->options & RES_INIT) == 0 &&
|
|
res_ninit(dns->res) < 0)
|
|
return (NULL);
|
|
|
|
return (dns->res);
|
|
}
|
|
|
|
static void
|
|
dns_res_set(struct irs_acc *this, struct __res_state *res,
|
|
void (*free_res)(void *)) {
|
|
struct dns_p *dns = (struct dns_p *)this->private;
|
|
|
|
if (dns->res && dns->free_res) {
|
|
res_nclose(dns->res);
|
|
(*dns->free_res)(dns->res);
|
|
}
|
|
dns->res = res;
|
|
dns->free_res = free_res;
|
|
}
|
|
|
|
static void
|
|
dns_close(struct irs_acc *this) {
|
|
struct dns_p *dns;
|
|
|
|
dns = (struct dns_p *)this->private;
|
|
if (dns->res && dns->free_res)
|
|
(*dns->free_res)(dns->res);
|
|
if (dns->hes_ctx)
|
|
hesiod_end(dns->hes_ctx);
|
|
memput(dns, sizeof *dns);
|
|
memput(this, sizeof *this);
|
|
}
|
|
|