122 lines
3.2 KiB
C
122 lines
3.2 KiB
C
/* Netgroup file parser in nss_db modules.
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Copyright (C) 1996-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <dlfcn.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netgroup.h>
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#include <string.h>
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#include <stdint.h>
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#include <libc-lock.h>
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#include <paths.h>
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#include <stdlib.h>
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#include "nsswitch.h"
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#include "nss_db.h"
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/* The hashing function we use. */
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#include "../intl/hash-string.h"
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#define DBFILE _PATH_VARDB "netgroup.db"
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/* Maintenance of the shared handle open on the database. */
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enum nss_status
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_nss_db_setnetgrent (const char *group, struct __netgrent *result)
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{
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struct nss_db_map state;
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enum nss_status status = internal_setent (DBFILE, &state);
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if (status == NSS_STATUS_SUCCESS)
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{
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const struct nss_db_header *header = state.header;
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const stridx_t *hashtable
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= (const stridx_t *) ((const char *) header
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+ header->dbs[0].hashoffset);
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const char *valstrtab = (const char *) header + header->valstroffset;
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uint32_t hashval = __hash_string (group);
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size_t grouplen = strlen (group);
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size_t hidx = hashval % header->dbs[0].hashsize;
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size_t hval2 = 1 + hashval % (header->dbs[0].hashsize - 2);
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status = NSS_STATUS_NOTFOUND;
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while (hashtable[hidx] != ~((stridx_t) 0))
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{
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const char *valstr = valstrtab + hashtable[hidx];
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if (strncmp (valstr, group, grouplen) == 0
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&& isblank (valstr[grouplen]))
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{
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const char *cp = &valstr[grouplen + 1];
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while (isblank (*cp))
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++cp;
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if (*cp != '\0')
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{
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result->data = strdup (cp);
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if (result->data == NULL)
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status = NSS_STATUS_TRYAGAIN;
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else
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{
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status = NSS_STATUS_SUCCESS;
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result->cursor = result->data;
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}
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break;
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}
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}
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if ((hidx += hval2) >= header->dbs[0].hashsize)
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hidx -= header->dbs[0].hashsize;
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}
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internal_endent (&state);
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}
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return status;
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}
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enum nss_status
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_nss_db_endnetgrent (struct __netgrent *result)
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{
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free (result->data);
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result->data = NULL;
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result->data_size = 0;
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result->cursor = NULL;
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return NSS_STATUS_SUCCESS;
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}
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extern enum nss_status _nss_netgroup_parseline (char **cursor,
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struct __netgrent *result,
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char *buffer, size_t buflen,
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int *errnop);
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enum nss_status
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_nss_db_getnetgrent_r (struct __netgrent *result, char *buffer, size_t buflen,
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int *errnop)
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{
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enum nss_status status;
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status = _nss_netgroup_parseline (&result->cursor, result, buffer, buflen,
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errnop);
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return status;
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}
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