shadow/lib/gspack.c

151 lines
4.0 KiB
C

/*
* 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 SHADOWGRP /*{*/
#include "rcsid.h"
RCSID("$Id: gspack.c,v 1.3 1997/12/07 23:26:53 marekm Exp $")
#include <stdio.h>
#include "defines.h"
/*
* sgr_pack - convert a shadow group structure to a packed
* shadow group record
*
* sgr_pack takes the shadow group structure and packs
* the components in a record. this record will be
* unpacked later by sgr_unpack.
*/
int
sgr_pack(const struct sgrp *sgrp, char *buf)
{
char *cp;
int i;
/*
* The name and password are both easy - append each string
* to the buffer. These are always the first two strings
* in a record.
*/
cp = buf;
strcpy (cp, sgrp->sg_name);
cp += strlen (cp) + 1;
strcpy (cp, sgrp->sg_passwd);
cp += strlen (cp) + 1;
/*
* The arrays of administrators and members are slightly
* harder. Each element is appended as a string, with a
* final '\0' appended to serve as a blank string. The
* number of elements is not known in advance, so the
* entire collection of administrators must be scanned to
* find the start of the members.
*/
for (i = 0;sgrp->sg_adm[i];i++) {
strcpy (cp, sgrp->sg_adm[i]);
cp += strlen (cp) + 1;
}
*cp++ = '\0';
for (i = 0;sgrp->sg_mem[i];i++) {
strcpy (cp, sgrp->sg_mem[i]);
cp += strlen (cp) + 1;
}
*cp++ = '\0';
return cp - buf;
}
/*
* sgr_unpack - convert a packed shadow group record to an
* unpacked record
*
* sgr_unpack converts a record which was packed by sgr_pack
* into the normal shadow group structure format.
*/
int
sgr_unpack(char *buf, int len, struct sgrp *sgrp)
{
char *org = buf;
int i;
/*
* The name and password are both easy - they are the first
* two strings in the record.
*/
sgrp->sg_name = buf;
buf += strlen (buf) + 1;
if (buf - org > len)
return -1;
sgrp->sg_passwd = buf;
buf += strlen (buf) + 1;
if (buf - org > len)
return -1;
/*
* The administrators and members are slightly more difficult.
* The arrays are lists of strings. Each list is terminated
* by a string of length zero. This string is detected by
* looking for an initial character of '\0'.
*/
for (i = 0;*buf && i < 1024;i++) {
sgrp->sg_adm[i] = buf;
buf += strlen (buf) + 1;
if (buf - org > len)
return -1;
}
sgrp->sg_adm[i] = (char *) 0;
if (! *buf)
buf++;
for (i = 0;*buf && i < 1024;i++) {
sgrp->sg_mem[i] = buf;
buf += strlen (buf) + 1;
if (buf - org > len)
return -1;
}
sgrp->sg_mem[i] = (char *) 0;
return 0;
}
#endif /*}*/