/*      $NetBSD: gen_pw.c,v 1.1.1.2 2012/09/09 16:07:55 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_pw.c,v 1.3 2005/04/27 04:56:24 sra Exp ";
#endif

/* Imports */

#include "port_before.h"

#ifndef WANT_IRS_PW
static int __bind_irs_pw_unneeded;
#else

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

#include <errno.h>
#include <pwd.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                     pw_close(struct irs_pw *);
static struct passwd *          pw_next(struct irs_pw *);
static struct passwd *          pw_byname(struct irs_pw *, const char *);
static struct passwd *          pw_byuid(struct irs_pw *, uid_t);
static void                     pw_rewind(struct irs_pw *);
static void                     pw_minimize(struct irs_pw *);
static struct __res_state *     pw_res_get(struct irs_pw *);
static void                     pw_res_set(struct irs_pw *,
                                          struct __res_state *,
                                          void (*)(void *));

/* Public */

struct irs_pw *
irs_gen_pw(struct irs_acc *this) {
       struct gen_p *accpvt = (struct gen_p *)this->private;
       struct irs_pw *pw;
       struct pvt *pvt;

       if (!(pw = memget(sizeof *pw))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(pw, 0x5e, sizeof *pw);
       if (!(pvt = memget(sizeof *pvt))) {
               memput(pw, sizeof *pvt);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       pvt->rules = accpvt->map_rules[irs_pw];
       pvt->rule = pvt->rules;
       pw->private = pvt;
       pw->close = pw_close;
       pw->next = pw_next;
       pw->byname = pw_byname;
       pw->byuid = pw_byuid;
       pw->rewind = pw_rewind;
       pw->minimize = pw_minimize;
       pw->res_get = pw_res_get;
       pw->res_set = pw_res_set;
       return (pw);
}

/* Methods */

static void
pw_close(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;

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

static struct passwd *
pw_next(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct passwd *rval;
       struct irs_pw *pw;

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

static void
pw_rewind(struct irs_pw *this) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct irs_pw *pw;

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

static struct passwd *
pw_byname(struct irs_pw *this, const char *name) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct irs_rule *rule;
       struct passwd *rval;
       struct irs_pw *pw;

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

static struct passwd *
pw_byuid(struct irs_pw *this, uid_t uid) {
       struct pvt *pvt = (struct pvt *)this->private;
       struct irs_rule *rule;
       struct passwd *rval;
       struct irs_pw *pw;

       rval = NULL;
       for (rule = pvt->rules; rule; rule = rule->next) {
               pw = rule->inst->pw;
               rval = (*pw->byuid)(pw, uid);
               if (rval || !(rule->flags & IRS_CONTINUE))
                       break;
       }
       return (rval);
}

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

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

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

static struct __res_state *
pw_res_get(struct irs_pw *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);
               pw_res_set(this, res, free);
       }

       return (pvt->res);
}

static void
pw_res_set(struct irs_pw *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_pw *pw = rule->inst->pw;

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

#endif /* WANT_IRS_PW */
/*! \file */

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