/*
 * 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;
        struct __res_state *    res;
        void                    (*free_res)(void *);
};

/* Forward */

static void                     sv_close(struct irs_sv*);
static struct servent *         sv_next(struct irs_sv *);
static struct servent *         sv_byname(struct irs_sv *, const char *,
                                          const char *);
static struct servent *         sv_byport(struct irs_sv *, int, const char *);
static void                     sv_rewind(struct irs_sv *);
static void                     sv_minimize(struct irs_sv *);
static struct __res_state *     sv_res_get(struct irs_sv *);
static void                     sv_res_set(struct irs_sv *,
                                              struct __res_state *,
                                              void (*)(void *));

/* Public */

struct irs_sv *
irs_gen_sv(struct irs_acc *this) {
        struct gen_p *accpvt = (struct gen_p *)this->private;
        struct irs_sv *sv;
        struct pvt *pvt;

        if (!(sv = memget(sizeof *sv))) {
                errno = ENOMEM;
                return (NULL);
        }
        memset(sv, 0x5e, sizeof *sv);
        if (!(pvt = memget(sizeof *pvt))) {
                memput(sv, sizeof *sv);
                errno = ENOMEM;
                return (NULL);
        }
        memset(pvt, 0, sizeof *pvt);
        pvt->rules = accpvt->map_rules[irs_sv];
        pvt->rule = pvt->rules;
        sv->private = pvt;
        sv->close = sv_close;
        sv->next = sv_next;
        sv->byname = sv_byname;
        sv->byport = sv_byport;
        sv->rewind = sv_rewind;
        sv->minimize = sv_minimize;
        sv->res_get = sv_res_get;
        sv->res_set = sv_res_set;
        return (sv);
}

/* Methods */

static void
sv_close(struct irs_sv *this) {
        struct pvt *pvt = (struct pvt *)this->private;

        memput(pvt, sizeof *pvt);
        memput(this, sizeof *this);
}

static struct servent *
sv_next(struct irs_sv *this) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct servent *rval;
        struct irs_sv *sv;

        while (pvt->rule) {
                sv = pvt->rule->inst->sv;
                rval = (*sv->next)(sv);
                if (rval)
                        return (rval);
                if (!(pvt->rule->flags & IRS_CONTINUE))
                        break;
                pvt->rule = pvt->rule->next;
                if (pvt->rule) {
                        sv = pvt->rule->inst->sv;
                        (*sv->rewind)(sv);
                }
        }
        return (NULL);
}

static struct servent *
sv_byname(struct irs_sv *this, const char *name, const char *proto) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_rule *rule;
        struct servent *rval;
        struct irs_sv *sv;

        rval = NULL;
        for (rule = pvt->rules; rule; rule = rule->next) {
                sv = rule->inst->sv;
                rval = (*sv->byname)(sv, name, proto);
                if (rval || !(rule->flags & IRS_CONTINUE))
                        break;
        }
        return (rval);
}

static struct servent *
sv_byport(struct irs_sv *this, int port, const char *proto) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_rule *rule;
        struct servent *rval;
        struct irs_sv *sv;

        rval = NULL;
        for (rule = pvt->rules; rule; rule = rule->next) {
                sv = rule->inst->sv;
                rval = (*sv->byport)(sv, port, proto);
                if (rval || !(rule->flags & IRS_CONTINUE))
                        break;
        }
        return (rval);
}

static void
sv_rewind(struct irs_sv *this) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_sv *sv;

        pvt->rule = pvt->rules;
        if (pvt->rule) {
                sv = pvt->rule->inst->sv;
                (*sv->rewind)(sv);
        }
}

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

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

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

static struct __res_state *
sv_res_get(struct irs_sv *this) {
        struct pvt *pvt = (struct pvt *)this->private;

        if (!pvt->res) {
                struct __res_state *res;
                res = (struct __res_state *)malloc(sizeof *res);
                if (!res) {
                        errno = ENOMEM;
                        return (NULL);
                }
                memset(res, 0, sizeof *res);
                sv_res_set(this, res, free);
        }

        return (pvt->res);
}

static void
sv_res_set(struct irs_sv *this, struct __res_state *res,
                void (*free_res)(void *)) {
        struct pvt *pvt = (struct pvt *)this->private;
        struct irs_rule *rule;

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

        pvt->res = res;
        pvt->free_res = free_res;

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

                if (sv->res_set)
                        (*sv->res_set)(sv, pvt->res, NULL);
        }
}

/*! \file */