/*
 * 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.
 */

/* Imports */

#include "port_before.h"

#include <sys/types.h>

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

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

#include <isc/memcluster.h>
#include <irs.h>

#include "port_after.h"

#include "irs_p.h"
#include "gen_p.h"

/* Types */

struct pvt {
        struct irs_rule *       rules;
        struct irs_rule *       rule;
        char *                  curgroup;
};

/* Forward */

static void             ng_close(struct irs_ng *);
static int              ng_next(struct irs_ng *, const char **,
                                const char **, const char **);
static int              ng_test(struct irs_ng *, const char *,
                                const char *, const char *,
                                const char *);
static void             ng_rewind(struct irs_ng *, const char *);
static void             ng_minimize(struct irs_ng *);

/* Public */

struct irs_ng *
irs_gen_ng(struct irs_acc *this) {
        struct gen_p *accpvt = (struct gen_p *)this->private;
        struct irs_ng *ng;
        struct pvt *pvt;

        if (!(ng = memget(sizeof *ng))) {
                errno = ENOMEM;
                return (NULL);
        }
        memset(ng, 0x5e, sizeof *ng);
        if (!(pvt = memget(sizeof *pvt))) {
                memput(ng, sizeof *ng);
                errno = ENOMEM;
                return (NULL);
        }
        memset(pvt, 0, sizeof *pvt);
        pvt->rules = accpvt->map_rules[irs_ng];
        pvt->rule = pvt->rules;
        ng->private = pvt;
        ng->close = ng_close;
        ng->next = ng_next;
        ng->test = ng_test;
        ng->rewind = ng_rewind;
        ng->minimize = ng_minimize;
        return (ng);
}

/* Methods */

static void
ng_close(struct irs_ng *this) {
        struct pvt *pvt = (struct pvt *)this->private;

        ng_minimize(this);
        if (pvt->curgroup)
                free(pvt->curgroup);
        memput(pvt, sizeof *pvt);
        memput(this, sizeof *this);
}

static int
ng_next(struct irs_ng *this, const char **host, const char **user,
        const char **domain)
{
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_ng *ng;

        while (pvt->rule) {
                ng = pvt->rule->inst->ng;
                if ((*ng->next)(ng, host, user, domain) == 1)
                        return (1);
                if (!(pvt->rule->flags & IRS_CONTINUE))
                        break;
                pvt->rule = pvt->rule->next;
                if (pvt->rule) {
                        ng = pvt->rule->inst->ng;
                        (*ng->rewind)(ng, pvt->curgroup);
                }
        }
        return (0);
}

static int
ng_test(struct irs_ng *this, const char *name,
        const char *user, const char *host, const char *domain)
{
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_rule *rule;
        struct irs_ng *ng;
        int rval;

        rval = 0;
        for (rule = pvt->rules; rule; rule = rule->next) {
                ng = rule->inst->ng;
                rval = (*ng->test)(ng, name, user, host, domain);
                if (rval || !(rule->flags & IRS_CONTINUE))
                        break;
        }
        return (rval);
}

static void
ng_rewind(struct irs_ng *this, const char *group) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_ng *ng;

        pvt->rule = pvt->rules;
        if (pvt->rule) {
                if (pvt->curgroup)
                        free(pvt->curgroup);
                pvt->curgroup = strdup(group);
                ng = pvt->rule->inst->ng;
                (*ng->rewind)(ng, pvt->curgroup);
        }
}

static void
ng_minimize(struct irs_ng *this) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_rule *rule;

        for (rule = pvt->rules; rule != NULL; rule = rule->next) {
                struct irs_ng *ng = rule->inst->ng;

                (*ng->minimize)(ng);
        }
}

/*! \file */