common/irs/lcl.c

/*
 * 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: lcl.c,v 1.4 2005/04/27 04:56:30 sra Exp $";
#endif

/* Imports */

#include "port_before.h"

#include <stdlib.h>
#include <errno.h>
#include <string.h>

#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>

#include <isc/memcluster.h>

#include <irs.h>

#include "port_after.h"

#include "irs_p.h"
#include "lcl_p.h"

/* Forward. */

static void     lcl_close(struct irs_acc *);
static struct __res_state * lcl_res_get(struct irs_acc *);
static void     lcl_res_set(struct irs_acc *, struct __res_state *,
                void (*)(void *));

/* Public */

struct irs_acc *
irs_lcl_acc(const char *options) {
    struct irs_acc *acc;
    struct lcl_p *lcl;

    UNUSED(options);

    if (!(acc = memget(sizeof *acc))) {
        errno = ENOMEM;
        return (NULL);
    }
    memset(acc, 0x5e, sizeof *acc);
    if (!(lcl = memget(sizeof *lcl))) {
        errno = ENOMEM;
        free(acc);
        return (NULL);
    }
    memset(lcl, 0x5e, sizeof *lcl);
    lcl->res = NULL;
    lcl->free_res = NULL;
    acc->private = lcl;
#ifdef WANT_IRS_GR
    acc->gr_map = irs_lcl_gr;
#else
    acc->gr_map = NULL;
#endif
#ifdef WANT_IRS_PW
    acc->pw_map = irs_lcl_pw;
#else
    acc->pw_map = NULL;
#endif
    acc->sv_map = irs_lcl_sv;
    acc->pr_map = irs_lcl_pr;
    acc->ho_map = irs_lcl_ho;
    acc->nw_map = irs_lcl_nw;
    acc->ng_map = irs_lcl_ng;
    acc->res_get = lcl_res_get;
    acc->res_set = lcl_res_set;
    acc->close = lcl_close;
    return (acc);
}

/* Methods */
static struct __res_state *
lcl_res_get(struct irs_acc *this) {
    struct lcl_p *lcl = (struct lcl_p *)this->private;

    if (lcl->res == NULL) {
        struct __res_state *res;
        res = (struct __res_state *)malloc(sizeof *res);
        if (res == NULL)
            return (NULL);
        memset(res, 0, sizeof *res);
        lcl_res_set(this, res, free);
    }

    if ((lcl->res->options & RES_INIT) == 0U &&
        res_ninit(lcl->res) < 0)
        return (NULL);

    return (lcl->res);
}

static void
lcl_res_set(struct irs_acc *this, struct __res_state *res,
        void (*free_res)(void *)) {
    struct lcl_p *lcl = (struct lcl_p *)this->private;

    if (lcl->res && lcl->free_res) {
        res_nclose(lcl->res);
        (*lcl->free_res)(lcl->res);
    }

    lcl->res = res;
    lcl->free_res = free_res;
}

static void
lcl_close(struct irs_acc *this) {
    struct lcl_p *lcl = (struct lcl_p *)this->private;

    if (lcl) {
        if (lcl->free_res)
            (*lcl->free_res)(lcl->res);
        memput(lcl, sizeof *lcl);
    }
    memput(this, sizeof *this);
}

/*! \file */