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authorUlrich Drepper <drepper@gmail.com>2011-06-15 21:00:21 -0400
committerUlrich Drepper <drepper@gmail.com>2011-06-15 21:06:19 -0400
commit9f2da732e7b03825027462dd1c46f8b4d18fc1f5 (patch)
treed7158fab8d3f0ee030e7efa8b681bcbeb1ca7b0e /nss/nss_db
parent82e9a1f7df488c62a214ee63847b2c884dcba565 (diff)
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Add initgroups lookups to nss_db
Diffstat (limited to 'nss/nss_db')
-rw-r--r--nss/nss_db/db-initgroups.c138
1 files changed, 138 insertions, 0 deletions
diff --git a/nss/nss_db/db-initgroups.c b/nss/nss_db/db-initgroups.c
new file mode 100644
index 0000000..aa8163b
--- /dev/null
+++ b/nss/nss_db/db-initgroups.c
@@ -0,0 +1,138 @@
+/* Initgroups handling in nss_db module.
+ Copyright (C) 2011 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@gmail.com>.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <ctype.h>
+#include <errno.h>
+#include <grp.h>
+#include <paths.h>
+
+#include "nss_db.h"
+
+/* The hashing function we use. */
+#include "../intl/hash-string.h"
+
+
+enum nss_status
+_nss_db_initgroups_dyn (const char *user, gid_t group, long int *start,
+ long int *size, gid_t **groupsp, long int limit,
+ int *errnop)
+{
+ struct nss_db_map state = { NULL, 0 };
+ enum nss_status status = internal_setent (_PATH_VARDB "group.db", &state);
+ if (status != NSS_STATUS_SUCCESS)
+ {
+ *errnop = errno;
+ return status;
+ }
+
+ const struct nss_db_header *header = state.header;
+ int i;
+ for (i = 0; i < header->ndbs; ++i)
+ if (header->dbs[i].id == ':')
+ break;
+ if (i == header->ndbs)
+ {
+ status = NSS_STATUS_UNAVAIL;
+ goto out;
+ }
+
+ const stridx_t *hashtable
+ = (const stridx_t *) ((const char *) header
+ + header->dbs[i].hashoffset);
+ const char *valstrtab = (const char *) header + header->valstroffset;
+ size_t userlen = strlen (user);
+ uint32_t hashval = __hash_string (user);
+ size_t hidx = hashval % header->dbs[i].hashsize;
+ size_t hval2 = 1 + hashval % (header->dbs[i].hashsize - 2);
+
+ gid_t *groups = *groupsp;
+
+ status = NSS_STATUS_NOTFOUND;
+ while (hashtable[hidx] != ~((stridx_t) 0))
+ {
+ const char *valstr = valstrtab + hashtable[hidx];
+ while (isblank (*valstr))
+ ++valstr;
+
+ if (strncmp (valstr, user, userlen) == 0 && isblank (valstr[userlen]))
+ {
+ valstr += userlen + 1;
+ while (isblank (*valstr))
+ ++valstr;
+
+ while (*valstr != '\0')
+ {
+ errno = 0;
+ char *endp;
+ unsigned long int n = strtoul (valstr, &endp, 10);
+ if (*endp != ',' && *endp != '\0')
+ break;
+ valstr = *endp == '\0' ? endp : endp + 1;
+
+ if (n != ULONG_MAX || errno != ERANGE)
+ {
+ /* Insert the group. */
+ if (*start == *size)
+ {
+ /* Need a bigger buffer. */
+ if (limit > 0 && *size == limit)
+ {
+ /* We reached the maximum. */
+ status = NSS_STATUS_SUCCESS;
+ goto out;
+ }
+
+ long int newsize;
+ if (limit <= 0)
+ newsize = 2 * *size;
+ else
+ newsize = MIN (limit, 2 * *size);
+
+ gid_t *newgroups = realloc (groups,
+ newsize * sizeof (*groups));
+ if (newgroups == NULL)
+ {
+ *errnop = ENOMEM;
+ status = NSS_STATUS_TRYAGAIN;
+ goto out;
+ }
+
+ *groupsp = groups = newgroups;
+ *size = newsize;
+ }
+
+ groups[*start] = n;
+ *start += 1;
+ }
+ }
+
+ status = NSS_STATUS_SUCCESS;
+ break;
+ }
+
+ if ((hidx += hval2) >= header->dbs[i].hashsize)
+ hidx -= header->dbs[i].hashsize;
+ }
+
+ out:
+ internal_endent (&state);
+
+ return status;
+}