common/irs/gen_ng.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: 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 */