Logo Search packages:      
Sourcecode: shadow version File versions

gspack.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 6 2005-03-20 15:34:28Z bubulle $")

#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 /*}*/

Generated by  Doxygen 1.6.0   Back to index