/*      $NetBSD: lcl_pw.c,v 1.1.1.2 2012/09/09 16:07:58 christos Exp $  */

/*
* Copyright (c) 1989, 1993, 1995
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
* Portions 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(LIBC_SCCS) && !defined(lint)
static const char rcsid[] = "Id: lcl_pw.c,v 1.3 2005/04/27 04:56:31 sra Exp ";
#endif /* LIBC_SCCS and not lint */

/* Extern */

#include "port_before.h"

#ifndef WANT_IRS_PW
static int __bind_irs_pw_unneeded;
#else

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

#include <db.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <pwd.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <utmp.h>
#include <unistd.h>

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

#include "port_after.h"

#include "irs_p.h"
#include "lcl_p.h"

/*! \file
* \brief
* The lookup techniques and data extraction code here must be kept
* in sync with that in `pwd_mkdb'.
*/


/* Types */

struct  pvt {
       struct passwd   passwd;         /*%< password structure */
       DB              *pw_db;         /*%< password database */
       int             pw_keynum;      /*%< key counter */
       int             warned;
       u_int           max;
       char *          line;
};

/* 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 int                      initdb(struct pvt *);
static int                      hashpw(struct irs_pw *, DBT *);

/* Public */
struct irs_pw *
irs_lcl_pw(struct irs_acc *this) {
       struct irs_pw *pw;
       struct pvt *pvt;

       UNUSED(this);

       if (!(pw = memget(sizeof *pw))) {
               errno = ENOMEM;
               return (NULL);
       }
       memset(pw, 0x5e, sizeof *pw);
       if (!(pvt = memget(sizeof *pvt))) {
               free(pw);
               errno = ENOMEM;
               return (NULL);
       }
       memset(pvt, 0, sizeof *pvt);
       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 = NULL;
       pw->res_set = NULL;
       return (pw);
}

/* Methods */

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

       if (pvt->pw_db) {
               (void)(pvt->pw_db->close)(pvt->pw_db);
               pvt->pw_db = NULL;
       }
       if (pvt->line)
               memput(pvt->line, pvt->max);
       memput(pvt, sizeof *pvt);
       memput(this, sizeof *this);
}

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

       DBT key;
       char bf[sizeof(pvt->pw_keynum) + 1];

       if (!initdb(pvt))
               return (NULL);

       ++pvt->pw_keynum;
       bf[0] = _PW_KEYBYNUM;
       memcpy(bf + 1, (char *)&pvt->pw_keynum, sizeof(pvt->pw_keynum));
       key.data = (u_char *)bf;
       key.size = sizeof(pvt->pw_keynum) + 1;
       return (hashpw(this, &key) ? &pvt->passwd : NULL);
}

static struct passwd *
pw_byname(struct irs_pw *this, const char *name) {
       struct pvt *pvt = (struct pvt *)this->private;
       DBT key;
       int len, rval;
       char bf[UT_NAMESIZE + 1];

       if (!initdb(pvt))
               return (NULL);

       bf[0] = _PW_KEYBYNAME;
       len = strlen(name);
       memcpy(bf + 1, name, MIN(len, UT_NAMESIZE));
       key.data = (u_char *)bf;
       key.size = len + 1;
       rval = hashpw(this, &key);

       return (rval ? &pvt->passwd : NULL);
}


static struct passwd *
pw_byuid(struct irs_pw *this, uid_t uid) {
       struct pvt *pvt = (struct pvt *)this->private;
       DBT key;
       int keyuid, rval;
       char bf[sizeof(keyuid) + 1];

       if (!initdb(pvt))
               return (NULL);

       bf[0] = _PW_KEYBYUID;
       keyuid = uid;
       memcpy(bf + 1, &keyuid, sizeof(keyuid));
       key.data = (u_char *)bf;
       key.size = sizeof(keyuid) + 1;
       rval = hashpw(this, &key);

       return (rval ? &pvt->passwd : NULL);
}

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

       pvt->pw_keynum = 0;
}

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

       if (pvt->pw_db != NULL) {
               (void) (*pvt->pw_db->close)(pvt->pw_db);
               pvt->pw_db = NULL;
       }
}

/* Private. */

static int
initdb(struct pvt *pvt) {
       const char *p;

       if (pvt->pw_db) {
               if (lseek((*pvt->pw_db->fd)(pvt->pw_db), 0L, SEEK_CUR) >= 0L)
                       return (1);
               else
                       (void) (*pvt->pw_db->close)(pvt->pw_db);
       }
       pvt->pw_db = dbopen((p = _PATH_SMP_DB), O_RDONLY, 0, DB_HASH, NULL);
       if (!pvt->pw_db)
               pvt->pw_db = dbopen((p =_PATH_MP_DB), O_RDONLY,
                                   0, DB_HASH, NULL);
       if (pvt->pw_db)
               return (1);
       if (!pvt->warned) {
               syslog(LOG_ERR, "%s: %m", p);
               pvt->warned++;
       }
       return (0);
}

static int
hashpw(struct irs_pw *this, DBT *key) {
       struct pvt *pvt = (struct pvt *)this->private;
       char *p, *t, *l;
       DBT data;

       if ((pvt->pw_db->get)(pvt->pw_db, key, &data, 0))
               return (0);
       p = (char *)data.data;
       if (data.size > pvt->max) {
               size_t newlen = pvt->max + 1024;
               char *p = memget(newlen);
               if (p == NULL) {
                       return (0);
               }
               if (pvt->line != NULL) {
                       memcpy(p, pvt->line, pvt->max);
                       memput(pvt->line, pvt->max);
               }
               pvt->max = newlen;
               pvt->line = p;
       }

       /* THIS CODE MUST MATCH THAT IN pwd_mkdb. */
       t = pvt->line;
       l = pvt->line + pvt->max;
#define EXPAND(e) if ((e = t) == NULL) return (0); else \
                 do if (t >= l) return (0); while ((*t++ = *p++) != '\0')
#define SCALAR(v) if (t + sizeof v >= l) return (0); else \
                 (memmove(&(v), p, sizeof v), p += sizeof v)
       EXPAND(pvt->passwd.pw_name);
       EXPAND(pvt->passwd.pw_passwd);
       SCALAR(pvt->passwd.pw_uid);
       SCALAR(pvt->passwd.pw_gid);
       SCALAR(pvt->passwd.pw_change);
       EXPAND(pvt->passwd.pw_class);
       EXPAND(pvt->passwd.pw_gecos);
       EXPAND(pvt->passwd.pw_dir);
       EXPAND(pvt->passwd.pw_shell);
       SCALAR(pvt->passwd.pw_expire);
       return (1);
}

#endif /* WANT_IRS_PW */

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