359 lines
8.3 KiB
C
359 lines
8.3 KiB
C
/* Copyright (C) 1997,1998,2000-2003,2005,2006,2007
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Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <atomic.h>
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <netdb.h>
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#include <nss.h>
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#include <string.h>
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#include <netinet/ether.h>
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#include <netinet/if_ether.h>
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#include <rpcsvc/nis.h>
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#include <bits/libc-lock.h>
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#include "nss-nisplus.h"
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__libc_lock_define_initialized (static, lock)
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static nis_result *result;
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static nis_name tablename_val;
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static u_long tablename_len;
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#define NISENTRYVAL(idx, col, res) \
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(NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
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#define NISENTRYLEN(idx, col, res) \
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(NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
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static int
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_nss_nisplus_parse_etherent (nis_result *result, struct etherent *ether,
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char *buffer, size_t buflen, int *errnop)
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{
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char *p = buffer;
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size_t room_left = buflen;
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if (result == NULL)
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return 0;
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if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
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|| NIS_RES_NUMOBJ (result) != 1
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|| __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
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|| strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
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"ethers_tbl") != 0
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|| NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 2)
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return 0;
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/* Generate the ether entry format and use the normal parser */
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if (NISENTRYLEN (0, 0, result) + 1 > room_left)
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{
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*errnop = ERANGE;
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return -1;
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}
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char *cp = __stpncpy (p, NISENTRYVAL (0, 0, result),
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NISENTRYLEN (0, 0, result));
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*cp = '\0';
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room_left -= NISENTRYLEN (0, 0, result) + 1;
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ether->e_name = p;
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struct ether_addr *ea = ether_aton (NISENTRYVAL (0, 1, result));
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if (ea == NULL)
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{
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*errnop = EINVAL;
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return -2;
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}
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ether->e_addr = *ea;
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return 1;
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}
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static enum nss_status
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_nss_create_tablename (int *errnop)
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{
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if (tablename_val == NULL)
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{
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const char *local_dir = nis_local_directory ();
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size_t local_dir_len = strlen (local_dir);
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static const char prefix[] = "ethers.org_dir.";
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char *p = malloc (sizeof (prefix) + local_dir_len);
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if (p == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
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tablename_len = sizeof (prefix) - 1 + local_dir_len;
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atomic_write_barrier ();
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tablename_val = p;
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_setetherent (int stayopen)
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{
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enum nss_status status;
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int err;
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status = NSS_STATUS_SUCCESS;
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__libc_lock_lock (lock);
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if (result != NULL)
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{
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nis_freeresult (result);
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result = NULL;
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}
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if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
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status = NSS_STATUS_UNAVAIL;
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_endetherent (void)
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{
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__libc_lock_lock (lock);
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if (result != NULL)
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{
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nis_freeresult (result);
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result = NULL;
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}
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__libc_lock_unlock (lock);
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return NSS_STATUS_SUCCESS;
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}
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static enum nss_status
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internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
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size_t buflen, int *errnop)
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{
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if (tablename_val == NULL)
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{
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enum nss_status status = _nss_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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/* Get the next entry until we found a correct one. */
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int parse_res;
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do
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{
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nis_result *saved_result;
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if (result == NULL)
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{
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saved_result = NULL;
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result = nis_first_entry (tablename_val);
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if (result == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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return niserr2nss (result->status);
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}
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else
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{
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saved_result = result;
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result = nis_next_entry (tablename_val, &result->cookie);
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if (result == NULL)
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{
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*errnop = errno;
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return NSS_STATUS_TRYAGAIN;
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}
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if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
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{
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nis_freeresult (saved_result);
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return niserr2nss (result->status);
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}
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}
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parse_res = _nss_nisplus_parse_etherent (result, ether, buffer,
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buflen, errnop);
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if (parse_res == -1)
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{
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nis_freeresult (result);
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result = saved_result;
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return NSS_STATUS_TRYAGAIN;
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}
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if (saved_result != NULL)
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nis_freeresult (saved_result);
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}
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while (!parse_res);
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_getetherent_r (struct etherent *result, char *buffer,
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size_t buflen, int *errnop)
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{
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int status;
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__libc_lock_lock (lock);
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status = internal_nisplus_getetherent_r (result, buffer, buflen, errnop);
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__libc_lock_unlock (lock);
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return status;
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}
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enum nss_status
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_nss_nisplus_gethostton_r (const char *name, struct etherent *eth,
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char *buffer, size_t buflen, int *errnop)
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{
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if (tablename_val == NULL)
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{
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enum nss_status status = _nss_create_tablename (errnop);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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if (name == NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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char buf[strlen (name) + 9 + tablename_len];
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int olderr = errno;
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snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
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nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
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NULL, NULL);
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if (result == NULL)
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{
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
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{
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enum nss_status status = niserr2nss (result->status);
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nis_freeresult (result);
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return status;
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}
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int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
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buflen, errnop);
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/* We do not need the lookup result anymore. */
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nis_freeresult (result);
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if (__builtin_expect (parse_res < 1, 0))
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{
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__set_errno (olderr);
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if (parse_res == -1)
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return NSS_STATUS_TRYAGAIN;
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return NSS_STATUS_NOTFOUND;
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}
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return NSS_STATUS_SUCCESS;
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}
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enum nss_status
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_nss_nisplus_getntohost_r (const struct ether_addr *addr, struct etherent *eth,
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char *buffer, size_t buflen, int *errnop)
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{
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if (tablename_val == NULL)
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{
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__libc_lock_lock (lock);
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enum nss_status status = _nss_create_tablename (errnop);
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__libc_lock_unlock (lock);
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if (status != NSS_STATUS_SUCCESS)
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return status;
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}
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if (addr == NULL)
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{
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*errnop = EINVAL;
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return NSS_STATUS_UNAVAIL;
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}
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char buf[26 + tablename_len];
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snprintf (buf, sizeof (buf),
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"[addr=%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8
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":%" PRIx8 "],%s",
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addr->ether_addr_octet[0], addr->ether_addr_octet[1],
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addr->ether_addr_octet[2], addr->ether_addr_octet[3],
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addr->ether_addr_octet[4], addr->ether_addr_octet[5],
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tablename_val);
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nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
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NULL, NULL);
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if (result == NULL)
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{
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*errnop = ENOMEM;
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return NSS_STATUS_TRYAGAIN;
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}
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if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
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{
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enum nss_status status = niserr2nss (result->status);
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nis_freeresult (result);
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return status;
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}
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int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
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buflen, errnop);
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/* We do not need the lookup result anymore. */
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nis_freeresult (result);
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if (__builtin_expect (parse_res < 1, 0))
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{
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if (parse_res == -1)
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return NSS_STATUS_TRYAGAIN;
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return NSS_STATUS_NOTFOUND;
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}
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return NSS_STATUS_SUCCESS;
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}
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