diff options
Diffstat (limited to 'nis/nss_nisplus/nisplus-initgroups.c')
| -rw-r--r-- | nis/nss_nisplus/nisplus-initgroups.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/nis/nss_nisplus/nisplus-initgroups.c b/nis/nss_nisplus/nisplus-initgroups.c new file mode 100644 index 0000000000..6588ec2533 --- /dev/null +++ b/nis/nss_nisplus/nisplus-initgroups.c @@ -0,0 +1,150 @@ +/* Copyright (C) 1997, 2001, 2002, 2003, 2005, 2006 + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <atomic.h> +#include <nss.h> +#include <grp.h> +#include <ctype.h> +#include <errno.h> +#include <string.h> +#include <bits/libc-lock.h> +#include <rpcsvc/nis.h> + +#include "nss-nisplus.h" +#include "nisplus-parser.h" +#include <libnsl.h> +#include <nis_intern.h> +#include <nis_xdr.h> + +#define NISOBJVAL(col, obj) \ + ((obj)->EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val) + +#define NISOBJLEN(col, obj) \ + ((obj)->EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len) + +extern nis_name grp_tablename_val attribute_hidden; +extern size_t grp_tablename_len attribute_hidden; +extern enum nss_status _nss_grp_create_tablename (int *errnop); + + +enum nss_status +_nss_nisplus_initgroups_dyn (const char *user, gid_t group, long int *start, + long int *size, gid_t **groupsp, long int limit, + int *errnop) +{ + if (grp_tablename_val == NULL) + { + enum nss_status status = _nss_grp_create_tablename (errnop); + + if (status != NSS_STATUS_SUCCESS) + return status; + } + + nis_result *result; + char buf[strlen (user) + 12 + grp_tablename_len]; + + snprintf (buf, sizeof (buf), "[members=%s],%s", user, grp_tablename_val); + + result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH | ALL_RESULTS, NULL, NULL); + + if (result == NULL) + { + *errnop = ENOMEM; + return NSS_STATUS_TRYAGAIN; + } + + if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0)) + { + enum nss_status status = niserr2nss (result->status); + + nis_freeresult (result); + return status; + } + + if (NIS_RES_NUMOBJ (result) == 0) + { + errout: + nis_freeresult (result); + return NSS_STATUS_NOTFOUND; + } + + gid_t *groups = *groupsp; + nis_object *obj = NIS_RES_OBJECT (result); + for (unsigned int cnt = 0; cnt < NIS_RES_NUMOBJ (result); ++cnt, ++obj) + { + if (__type_of (obj) != NIS_ENTRY_OBJ + || strcmp (obj->EN_data.en_type, "group_tbl") != 0 + || obj->EN_data.en_cols.en_cols_len < 4) + continue; + + char *numstr = NISOBJVAL (2, obj); + size_t len = NISOBJLEN (2, obj); + if (len == 0 || numstr[0] == '\0') + continue; + + gid_t gid; + char *endp; + if (__builtin_expect (numstr[len - 1] != '\0', 0)) + { + char numstrbuf[len + 1]; + memcpy (numstrbuf, numstr, len); + numstrbuf[len] = '\0'; + gid = strtoul (numstrbuf, &endp, 10); + if (*endp) + continue; + } + else + { + gid = strtoul (numstr, &endp, 10); + if (*endp) + continue; + } + + if (gid == group) + continue; + + /* Insert this group. */ + if (*start == *size) + { + /* Need a bigger buffer. */ + long int newsize; + + if (limit > 0 && *size == limit) + /* We reached the maximum. */ + break; + + if (limit <= 0) + newsize = 2 * *size; + else + newsize = MIN (limit, 2 * *size); + + gid_t *newgroups = realloc (groups, newsize * sizeof (*groups)); + if (newgroups == NULL) + goto errout; + *groupsp = groups = newgroups; + *size = newsize; + } + + groups[*start] = gid; + *start += 1; + } + + nis_freeresult (result); + return NSS_STATUS_SUCCESS; +} |