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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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misc
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volume38
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shadow
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part12
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gsdbm.c
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C/C++ Source or Header
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1993-08-14
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/*
* Copyright 1990, 1991, 1992, John F. Haugh II
* All rights reserved.
*
* Permission is granted to copy and create derivative works for any
* non-commercial purpose, provided this copyright notice is preserved
* in all copies of source code, or included in human readable form
* and conspicuously displayed on all copies of object code or
* distribution media.
*
* This software is provided on an AS-IS basis and the author makes
* no warrantee of any kind.
*/
#ifndef lint
static char sccsid[] = "@(#)gsdbm.c 3.6 11:32:14 28 Jul 1992";
#endif
#include <string.h>
#include <stdio.h>
#include "shadow.h"
#include "config.h"
#ifdef NDBM
#include <ndbm.h>
DBM *sg_dbm;
#define GRP_FRAG 256
/*
* sg_dbm_update
*
* Updates the DBM password files, if they exist.
*/
int
sg_dbm_update (sgr)
struct sgrp *sgr;
{
datum key;
datum content;
char data[BUFSIZ*8];
char sgrpkey[60];
char *cp;
int len;
int i;
int cnt;
static int once;
if (! once) {
if (! sg_dbm)
setsgent ();
once++;
}
if (! sg_dbm)
return 0;
len = sgr_pack (sgr, data);
if (len <= GRP_FRAG) {
content.dsize = len;
content.dptr = data;
key.dsize = strlen (sgr->sg_name);
key.dptr = sgr->sg_name;
if (dbm_store (sg_dbm, key, content, DBM_REPLACE))
return 0;
} else {
content.dsize = sizeof cnt;
content.dptr = (char *) &cnt;
cnt = (len + (GRP_FRAG-1)) / GRP_FRAG;
key.dsize = strlen (sgr->sg_name);
key.dptr = sgr->sg_name;
if (dbm_store (sg_dbm, key, content, DBM_REPLACE))
return 0;
for (cp = data, i = 0;i < cnt;i++) {
content.dsize = len > GRP_FRAG ? GRP_FRAG:len;
len -= content.dsize;
content.dptr = cp;
cp += content.dsize;
key.dsize = sizeof i + strlen (sgr->sg_name);
key.dptr = sgrpkey;
memcpy (sgrpkey, (char *) &i, sizeof i);
strcpy (sgrpkey + sizeof i, sgr->sg_name);
if (dbm_store (sg_dbm, key, content, DBM_REPLACE))
return 0;
}
}
return 1;
}
/*
* sg_dbm_remove
*
* Deletes the DBM shadow group file entries, if they exist.
*/
int
sg_dbm_remove (name)
char *name;
{
datum key;
datum content;
char grpkey[60];
int i;
int cnt;
int errors = 0;
static int once;
if (! once) {
if (! sg_dbm)
setsgent ();
once++;
}
if (! sg_dbm)
return 0;
key.dsize = strlen (name);
key.dptr = name;
content = dbm_fetch (sg_dbm, key);
if (content.dptr == 0)
++errors;
else {
if (content.dsize == sizeof (int)) {
memcpy ((char *) &cnt, content.dptr, sizeof cnt);
for (i = 0;i < cnt;i++) {
key.dsize = sizeof i + strlen (name);
key.dptr = grpkey;
memcpy (grpkey, (char *) &i, sizeof i);
strcpy (grpkey + sizeof i, name);
if (dbm_delete (sg_dbm, key))
++errors;
}
} else {
if (dbm_delete (sg_dbm, key))
++errors;
}
}
return errors ? 0:1;
}
#endif