/*      $NetBSD: gen_ng.c,v 1.1.1.2 2012/09/09 16:07:51 christos Exp $  */

/*
* 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: gen_ng.c,v 1.3 2005/04/27 04:56:23 sra Exp ";
#endif

/* 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 */

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