irs_data.c   [plain text]

/*
 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
 * 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 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.
 */

#if !defined(LINT) && !defined(CODECENTER)
static const char rcsid[] = "$Id: irs_data.c,v 1.3.2.2.4.4 2006/03/10 00:17:21 marka Exp $";
#endif

#include "port_before.h"

#ifndef __BIND_NOSTATIC

#include <sys/types.h>

#include <netinet/in.h>
#include <arpa/nameser.h>

#include <resolv.h>
#include <stdio.h>
#include <string.h>
#include <isc/memcluster.h>

#ifdef DO_PTHREADS
#include <pthread.h>
#endif

#include <irs.h>
#include <stdlib.h>

#include "port_after.h"

#include "irs_data.h"
#undef _res
#if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
#undef h_errno
extern int h_errno;
#endif

extern struct __res_state _res;

#ifdef	DO_PTHREADS
static pthread_key_t	key;
static int		once = 0;
#else
static struct net_data	*net_data;
#endif

void
irs_destroy(void) {
#ifndef DO_PTHREADS
	if (net_data != NULL)
		net_data_destroy(net_data);
	net_data = NULL;
#endif
}

void
net_data_destroy(void *p) {
	struct net_data *net_data = p;

	res_ndestroy(net_data->res);
	if (net_data->gr != NULL) {
		(*net_data->gr->close)(net_data->gr);
		net_data->gr = NULL;
	}
	if (net_data->pw != NULL) {
		(*net_data->pw->close)(net_data->pw);
		net_data->pw = NULL;
	}
	if (net_data->sv != NULL) {
		(*net_data->sv->close)(net_data->sv);
		net_data->sv = NULL;
	}
	if (net_data->pr != NULL) {
		(*net_data->pr->close)(net_data->pr);
		net_data->pr = NULL;
	}
	if (net_data->ho != NULL) {
		(*net_data->ho->close)(net_data->ho);
		net_data->ho = NULL;
	}
	if (net_data->nw != NULL) {
		(*net_data->nw->close)(net_data->nw);
		net_data->nw = NULL;
	}
	if (net_data->ng != NULL) {
		(*net_data->ng->close)(net_data->ng);
		net_data->ng = NULL;
	}
	if (net_data->ho_data != NULL) {
		free(net_data->ho_data);
		net_data->ho_data = NULL;
	}
	if (net_data->nw_data != NULL) {
		free(net_data->nw_data);
		net_data->nw_data = NULL;
	}

	(*net_data->irs->close)(net_data->irs);
	memput(net_data, sizeof *net_data);
}

/* applications that need a specific config file other than
 * _PATH_IRS_CONF should call net_data_init directly rather than letting
 *   the various wrapper functions make the first call. - brister
 */

struct net_data *
net_data_init(const char *conf_file) {
#ifdef	DO_PTHREADS
#ifndef LIBBIND_MUTEX_INITIALIZER
#define LIBBIND_MUTEX_INITIALIZER PTHREAD_MUTEX_INITIALIZER
#endif
	static pthread_mutex_t keylock = LIBBIND_MUTEX_INITIALIZER;
	struct net_data *net_data;

	if (!once) {
		if (pthread_mutex_lock(&keylock) != 0)
			return (NULL);
		if (!once) {
			if (pthread_key_create(&key, net_data_destroy) != 0)
				return (NULL);
			once = 1;
		}
		if (pthread_mutex_unlock(&keylock) != 0)
			return (NULL);
	}
	net_data = pthread_getspecific(key);
#endif

	if (net_data == NULL) {
		net_data = net_data_create(conf_file);
		if (net_data == NULL)
			return (NULL);
#ifdef	DO_PTHREADS
		if (pthread_setspecific(key, net_data) != 0) {
			net_data_destroy(net_data);
			return (NULL);
		}
#endif
	}

	return (net_data);
}

struct net_data *
net_data_create(const char *conf_file) {
	struct net_data *net_data;

	net_data = memget(sizeof (struct net_data));
	if (net_data == NULL)
		return (NULL);
	memset(net_data, 0, sizeof (struct net_data));

	if ((net_data->irs = irs_gen_acc("", conf_file)) == NULL) {
		memput(net_data, sizeof (struct net_data));
		return (NULL);
	}
#ifndef DO_PTHREADS
	(*net_data->irs->res_set)(net_data->irs, &_res, NULL);
#endif

	net_data->res = (*net_data->irs->res_get)(net_data->irs);
	if (net_data->res == NULL) {
		(*net_data->irs->close)(net_data->irs);
		memput(net_data, sizeof (struct net_data));
		return (NULL);
	}

	if ((net_data->res->options & RES_INIT) == 0U &&
	    res_ninit(net_data->res) == -1) {
		(*net_data->irs->close)(net_data->irs);
		memput(net_data, sizeof (struct net_data));
		return (NULL);
	}

	return (net_data);
}

void
net_data_minimize(struct net_data *net_data) {
	res_nclose(net_data->res);
}

#ifdef _REENTRANT
struct __res_state *
__res_state(void) {
	/* NULL param here means use the default config file. */
	struct net_data *net_data = net_data_init(NULL);
	if (net_data && net_data->res)
		return (net_data->res);

	return (&_res);
}
#else
#ifdef __linux
struct __res_state *
__res_state(void) {
	return (&_res);
}
#endif
#endif

int *
__h_errno(void) {
	/* NULL param here means use the default config file. */
	struct net_data *net_data = net_data_init(NULL);
	if (net_data && net_data->res)
		return (&net_data->res->res_h_errno);
#if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
	return(&_res.res_h_errno);
#else
	return (&h_errno);
#endif
}

void
__h_errno_set(struct __res_state *res, int err) {


#if (__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
	res->res_h_errno = err;
#else
	h_errno = res->res_h_errno = err;
#endif
}

#endif /*__BIND_NOSTATIC*/