| /* Copyright (C) 1996-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Thorsten Kukuk <kukuk@suse.de>, 1996. |
| |
| 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <ctype.h> |
| #include <errno.h> |
| #include <grp.h> |
| #include <nss.h> |
| #include <string.h> |
| #include <bits/libc-lock.h> |
| #include <rpcsvc/yp.h> |
| #include <rpcsvc/ypclnt.h> |
| |
| #include "nss-nis.h" |
| #include <libnsl.h> |
| |
| /* Get the declaration of the parser function. */ |
| #define ENTNAME grent |
| #define STRUCTURE group |
| #define EXTERN_PARSER |
| #include <nss/nss_files/files-parse.c> |
| |
| /* Protect global state against multiple changers */ |
| __libc_lock_define_initialized (static, lock) |
| |
| static bool_t new_start = 1; |
| static char *oldkey; |
| static int oldkeylen; |
| static intern_t intern; |
| |
| |
| static void |
| internal_nis_endgrent (void) |
| { |
| new_start = 1; |
| if (oldkey != NULL) |
| { |
| free (oldkey); |
| oldkey = NULL; |
| oldkeylen = 0; |
| } |
| |
| struct response_t *curr = intern.start; |
| |
| while (curr != NULL) |
| { |
| struct response_t *last = curr; |
| curr = curr->next; |
| free (last); |
| } |
| |
| intern.next = intern.start = NULL; |
| } |
| |
| |
| enum nss_status |
| _nss_nis_endgrent (void) |
| { |
| __libc_lock_lock (lock); |
| |
| internal_nis_endgrent (); |
| |
| __libc_lock_unlock (lock); |
| |
| return NSS_STATUS_SUCCESS; |
| } |
| |
| |
| enum nss_status |
| internal_nis_setgrent (void) |
| { |
| /* We have to read all the data now. */ |
| char *domain; |
| if (__builtin_expect (yp_get_default_domain (&domain), 0)) |
| return NSS_STATUS_UNAVAIL; |
| |
| struct ypall_callback ypcb; |
| |
| ypcb.foreach = _nis_saveit; |
| ypcb.data = (char *) &intern; |
| enum nss_status status = yperr2nss (yp_all (domain, "group.byname", &ypcb)); |
| |
| |
| /* Mark the last buffer as full. */ |
| if (intern.next != NULL) |
| intern.next->size = intern.offset; |
| |
| intern.next = intern.start; |
| intern.offset = 0; |
| |
| return status; |
| } |
| |
| |
| enum nss_status |
| _nss_nis_setgrent (int stayopen) |
| { |
| enum nss_status result = NSS_STATUS_SUCCESS; |
| |
| __libc_lock_lock (lock); |
| |
| internal_nis_endgrent (); |
| |
| if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ) |
| result = internal_nis_setgrent (); |
| |
| __libc_lock_unlock (lock); |
| |
| return result; |
| } |
| |
| |
| static enum nss_status |
| internal_nis_getgrent_r (struct group *grp, char *buffer, size_t buflen, |
| int *errnop) |
| { |
| /* If we read the entire database at setpwent time we just iterate |
| over the data we have in memory. */ |
| bool batch_read = intern.start != NULL; |
| |
| char *domain = NULL; |
| if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0)) |
| return NSS_STATUS_UNAVAIL; |
| |
| /* Get the next entry until we found a correct one. */ |
| int parse_res; |
| do |
| { |
| char *result; |
| char *outkey; |
| int len; |
| int keylen; |
| |
| if (batch_read) |
| { |
| struct response_t *bucket; |
| |
| handle_batch_read: |
| bucket = intern.next; |
| |
| if (__builtin_expect (intern.offset >= bucket->size, 0)) |
| { |
| if (bucket->next == NULL) |
| return NSS_STATUS_NOTFOUND; |
| |
| /* We look at all the content in the current bucket. Go on |
| to the next. */ |
| bucket = intern.next = bucket->next; |
| intern.offset = 0; |
| } |
| |
| for (result = &bucket->mem[intern.offset]; isspace (*result); |
| ++result) |
| ++intern.offset; |
| |
| len = strlen (result); |
| } |
| else |
| { |
| int yperr; |
| |
| if (new_start) |
| { |
| /* Maybe we should read the database in one piece. */ |
| if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ) |
| && internal_nis_setgrent () == NSS_STATUS_SUCCESS |
| && intern.start != NULL) |
| { |
| batch_read = true; |
| goto handle_batch_read; |
| } |
| |
| yperr = yp_first (domain, "group.byname", &outkey, &keylen, |
| &result, &len); |
| } |
| else |
| yperr = yp_next (domain, "group.byname", oldkey, oldkeylen, |
| &outkey, &keylen, &result, &len); |
| |
| if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) |
| { |
| enum nss_status retval = yperr2nss (yperr); |
| |
| if (retval == NSS_STATUS_TRYAGAIN) |
| *errnop = errno; |
| return retval; |
| } |
| } |
| |
| if (__builtin_expect ((size_t) (len + 1) > buflen, 0)) |
| { |
| if (!batch_read) |
| free (result); |
| *errnop = ERANGE; |
| return NSS_STATUS_TRYAGAIN; |
| } |
| |
| char *p = strncpy (buffer, result, len); |
| buffer[len] = '\0'; |
| while (isspace (*p)) |
| ++p; |
| if (!batch_read) |
| free (result); |
| |
| parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen, |
| errnop); |
| if (__builtin_expect (parse_res == -1, 0)) |
| { |
| if (!batch_read) |
| free (outkey); |
| *errnop = ERANGE; |
| return NSS_STATUS_TRYAGAIN; |
| } |
| |
| if (batch_read) |
| intern.offset += len + 1; |
| else |
| { |
| free (oldkey); |
| oldkey = outkey; |
| oldkeylen = keylen; |
| new_start = 0; |
| } |
| } |
| while (parse_res < 1); |
| |
| return NSS_STATUS_SUCCESS; |
| } |
| |
| enum nss_status |
| _nss_nis_getgrent_r (struct group *result, char *buffer, size_t buflen, |
| int *errnop) |
| { |
| int status; |
| |
| __libc_lock_lock (lock); |
| |
| status = internal_nis_getgrent_r (result, buffer, buflen, errnop); |
| |
| __libc_lock_unlock (lock); |
| |
| return status; |
| } |
| |
| enum nss_status |
| _nss_nis_getgrnam_r (const char *name, struct group *grp, |
| char *buffer, size_t buflen, int *errnop) |
| { |
| if (name == NULL) |
| { |
| *errnop = EINVAL; |
| return NSS_STATUS_UNAVAIL; |
| } |
| |
| char *domain; |
| if (__builtin_expect (yp_get_default_domain (&domain), 0)) |
| return NSS_STATUS_UNAVAIL; |
| |
| char *result; |
| int len; |
| int yperr = yp_match (domain, "group.byname", name, strlen (name), &result, |
| &len); |
| |
| if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) |
| { |
| enum nss_status retval = yperr2nss (yperr); |
| |
| if (retval == NSS_STATUS_TRYAGAIN) |
| *errnop = errno; |
| return retval; |
| } |
| |
| if (__builtin_expect ((size_t) (len + 1) > buflen, 0)) |
| { |
| free (result); |
| *errnop = ERANGE; |
| return NSS_STATUS_TRYAGAIN; |
| } |
| |
| char *p = strncpy (buffer, result, len); |
| buffer[len] = '\0'; |
| while (isspace (*p)) |
| ++p; |
| free (result); |
| |
| int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen, |
| errnop); |
| if (__builtin_expect (parse_res < 1, 0)) |
| { |
| if (parse_res == -1) |
| return NSS_STATUS_TRYAGAIN; |
| else |
| return NSS_STATUS_NOTFOUND; |
| } |
| return NSS_STATUS_SUCCESS; |
| } |
| |
| enum nss_status |
| _nss_nis_getgrgid_r (gid_t gid, struct group *grp, |
| char *buffer, size_t buflen, int *errnop) |
| { |
| char *domain; |
| if (__builtin_expect (yp_get_default_domain (&domain), 0)) |
| return NSS_STATUS_UNAVAIL; |
| |
| char buf[32]; |
| int nlen = sprintf (buf, "%lu", (unsigned long int) gid); |
| |
| char *result; |
| int len; |
| int yperr = yp_match (domain, "group.bygid", buf, nlen, &result, &len); |
| |
| if (__builtin_expect (yperr != YPERR_SUCCESS, 0)) |
| { |
| enum nss_status retval = yperr2nss (yperr); |
| |
| if (retval == NSS_STATUS_TRYAGAIN) |
| *errnop = errno; |
| return retval; |
| } |
| |
| if (__builtin_expect ((size_t) (len + 1) > buflen, 0)) |
| { |
| free (result); |
| *errnop = ERANGE; |
| return NSS_STATUS_TRYAGAIN; |
| } |
| |
| char *p = strncpy (buffer, result, len); |
| buffer[len] = '\0'; |
| while (isspace (*p)) |
| ++p; |
| free (result); |
| |
| int parse_res = _nss_files_parse_grent (p, grp, (void *) buffer, buflen, |
| errnop); |
| if (__builtin_expect (parse_res < 1, 0)) |
| { |
| if (parse_res == -1) |
| return NSS_STATUS_TRYAGAIN; |
| else |
| return NSS_STATUS_NOTFOUND; |
| } |
| return NSS_STATUS_SUCCESS; |
| } |