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143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Initgroups handling in nss_db module.
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Copyright (C) 2011-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <https://www.gnu.org/licenses/>. */
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#include <ctype.h>
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#include <errno.h>
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#include <grp.h>
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#include <limits.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <sys/param.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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enum nss_status
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_nss_db_initgroups_dyn (const char *user, gid_t group, long int *start,
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long int *size, gid_t **groupsp, long int limit,
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int *errnop)
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{
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struct nss_db_map state = { NULL, 0 };
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enum nss_status status = internal_setent (_PATH_VARDB "group.db", &state);
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if (status != NSS_STATUS_SUCCESS)
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{
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*errnop = errno;
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return status;
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}
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const struct nss_db_header *header = state.header;
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int i;
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for (i = 0; i < header->ndbs; ++i)
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if (header->dbs[i].id == ':')
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break;
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if (i == header->ndbs)
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{
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status = NSS_STATUS_UNAVAIL;
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goto out;
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}
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const stridx_t *hashtable
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= (const stridx_t *) ((const char *) header
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+ header->dbs[i].hashoffset);
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const char *valstrtab = (const char *) header + header->valstroffset;
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size_t userlen = strlen (user);
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uint32_t hashval = __hash_string (user);
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size_t hidx = hashval % header->dbs[i].hashsize;
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size_t hval2 = 1 + hashval % (header->dbs[i].hashsize - 2);
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gid_t *groups = *groupsp;
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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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while (isblank (*valstr))
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++valstr;
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if (strncmp (valstr, user, userlen) == 0 && isblank (valstr[userlen]))
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{
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valstr += userlen + 1;
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while (isblank (*valstr))
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++valstr;
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while (*valstr != '\0')
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{
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errno = 0;
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char *endp;
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unsigned long int n = strtoul (valstr, &endp, 10);
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if (*endp != ',' && *endp != '\0')
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break;
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valstr = *endp == '\0' ? endp : endp + 1;
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if (n != ULONG_MAX || errno != ERANGE)
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{
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/* Insert the group. */
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if (*start == *size)
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{
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/* Need a bigger buffer. */
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if (limit > 0 && *size == limit)
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{
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/* We reached the maximum. */
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status = NSS_STATUS_SUCCESS;
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goto out;
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}
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long int newsize;
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if (limit <= 0)
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newsize = 2 * *size;
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else
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newsize = MIN (limit, 2 * *size);
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gid_t *newgroups = realloc (groups,
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newsize * sizeof (*groups));
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if (newgroups == NULL)
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{
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*errnop = ENOMEM;
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status = NSS_STATUS_TRYAGAIN;
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goto out;
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}
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*groupsp = groups = newgroups;
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*size = newsize;
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}
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groups[*start] = n;
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*start += 1;
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}
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}
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status = NSS_STATUS_SUCCESS;
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break;
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}
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if ((hidx += hval2) >= header->dbs[i].hashsize)
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hidx -= header->dbs[i].hashsize;
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}
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out:
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internal_endent (&state);
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return status;
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}
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