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/* Netgroup file parser in nss_db modules.
Copyright (C) 1996-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <ctype.h>
#include <dlfcn.h>
#include <errno.h>
#include <fcntl.h>
#include <netgroup.h>
#include <string.h>
#include <stdint.h>
#include <libc-lock.h>
#include <paths.h>
#include <stdlib.h>
#include "nsswitch.h"
#include "nss_db.h"
/* The hashing function we use. */
#include "../intl/hash-string.h"
#define DBFILE _PATH_VARDB "netgroup.db"
/* Maintenance of the shared handle open on the database. */
enum nss_status
_nss_db_setnetgrent (const char *group, struct __netgrent *result)
{
struct nss_db_map state;
enum nss_status status = internal_setent (DBFILE, &state);
if (status == NSS_STATUS_SUCCESS)
{
const struct nss_db_header *header = state.header;
const stridx_t *hashtable
= (const stridx_t *) ((const char *) header
+ header->dbs[0].hashoffset);
const char *valstrtab = (const char *) header + header->valstroffset;
uint32_t hashval = __hash_string (group);
size_t grouplen = strlen (group);
size_t hidx = hashval % header->dbs[0].hashsize;
size_t hval2 = 1 + hashval % (header->dbs[0].hashsize - 2);
status = NSS_STATUS_NOTFOUND;
while (hashtable[hidx] != ~((stridx_t) 0))
{
const char *valstr = valstrtab + hashtable[hidx];
if (strncmp (valstr, group, grouplen) == 0
&& isblank (valstr[grouplen]))
{
const char *cp = &valstr[grouplen + 1];
while (isblank (*cp))
++cp;
if (*cp != '\0')
{
result->data = strdup (cp);
if (result->data == NULL)
status = NSS_STATUS_TRYAGAIN;
else
{
status = NSS_STATUS_SUCCESS;
result->cursor = result->data;
}
break;
}
}
if ((hidx += hval2) >= header->dbs[0].hashsize)
hidx -= header->dbs[0].hashsize;
}
internal_endent (&state);
}
return status;
}
enum nss_status
_nss_db_endnetgrent (struct __netgrent *result)
{
free (result->data);
result->data = NULL;
result->data_size = 0;
result->cursor = NULL;
return NSS_STATUS_SUCCESS;
}
extern enum nss_status _nss_netgroup_parseline (char **cursor,
struct __netgrent *result,
char *buffer, size_t buflen,
int *errnop);
enum nss_status
_nss_db_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
int *errnop)
{
enum nss_status status;
status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
errnop);
return status;
}
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