From 9f2da732e7b03825027462dd1c46f8b4d18fc1f5 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Wed, 15 Jun 2011 21:00:21 -0400 Subject: Add initgroups lookups to nss_db --- nss/nss_db/db-initgroups.c | 138 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 nss/nss_db/db-initgroups.c (limited to 'nss/nss_db') diff --git a/nss/nss_db/db-initgroups.c b/nss/nss_db/db-initgroups.c new file mode 100644 index 0000000000..aa8163b5b0 --- /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 . + + 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 +#include +#include +#include + +#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; +} -- cgit 1.4.1