shadow/lib/pwdbm.c

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/*
* Copyright 1990 - 1994, Julianne Frances Haugh
* 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. Neither the name of Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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.
*/
#include <config.h>
#ifdef NDBM /*{*/
#include "rcsid.h"
RCSID("$Id: pwdbm.c,v 1.4 1997/12/14 20:07:19 marekm Exp $")
#include <sys/types.h>
#include <stdio.h>
#include <pwd.h>
#include "prototypes.h"
#include "defines.h"
#include <ndbm.h>
extern DBM *pw_dbm;
/*
* pw_dbm_update
*
* Updates the DBM password files, if they exist.
*/
int
pw_dbm_update(const struct passwd *pw)
{
datum key;
datum content;
char data[BUFSIZ];
int len;
static int once;
if (! once) {
if (! pw_dbm)
setpwent ();
once++;
}
if (! pw_dbm)
return 0;
len = pw_pack (pw, data);
content.dsize = len;
content.dptr = data;
key.dsize = strlen (pw->pw_name);
key.dptr = pw->pw_name;
if (dbm_store(pw_dbm, key, content, DBM_REPLACE))
return 0;
/*
* XXX - on systems with 16-bit UIDs (such as Linux/x86)
* name "aa" and UID 24929 will give the same key. This
* happens only rarely, but code which only "works most
* of the time" is not good enough...
*
* This needs to be fixed in several places (pwdbm.c,
* grdbm.c, pwent.c, grent.c). Fixing it will cause
* incompatibility with existing dbm files.
*
* Summary: don't use this stuff for now. --marekm
*/
key.dsize = sizeof pw->pw_uid;
key.dptr = (char *) &pw->pw_uid;
if (dbm_store(pw_dbm, key, content, DBM_REPLACE))
return 0;
return 1;
}
/*
* pw_dbm_remove
*
* Removes the DBM password entry, if it exists.
*/
int
pw_dbm_remove(const struct passwd *pw)
{
datum key;
static int once;
char data[BUFSIZ];
if (! once) {
if (! pw_dbm)
setpwent ();
once++;
}
if (! pw_dbm)
return 0;
key.dsize = strlen (pw->pw_name);
key.dptr = pw->pw_name;
if (dbm_delete (pw_dbm, key))
return 0;
key.dsize = sizeof pw->pw_uid;
key.dptr = (char *) &pw->pw_uid;
if (dbm_delete (pw_dbm, key))
return 0;
return 1;
}
int
pw_dbm_present(void)
{
return (access(PASSWD_PAG_FILE, F_OK) == 0);
}
#endif /* NDBM */