/* Copyright (C) 1997-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@suse.de>, 1997.
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 <atomic.h>
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <netdb.h>
#include <nss.h>
#include <string.h>
#include <netinet/ether.h>
#include <netinet/if_ether.h>
#include <rpcsvc/nis.h>
#include <libc-lock.h>
#include "nss-nisplus.h"
__libc_lock_define_initialized (static, lock)
static nis_result *result;
static nis_name tablename_val;
static u_long tablename_len;
#define NISENTRYVAL(idx, col, res) \
(NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
#define NISENTRYLEN(idx, col, res) \
(NIS_RES_OBJECT (res)[idx].zo_data.objdata_u.en_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
static int
_nss_nisplus_parse_etherent (nis_result *result, struct etherent *ether,
char *buffer, size_t buflen, int *errnop)
{
char *p = buffer;
size_t room_left = buflen;
if (result == NULL)
return 0;
if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
|| NIS_RES_NUMOBJ (result) != 1
|| __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
|| strcmp (NIS_RES_OBJECT (result)->EN_data.en_type,
"ethers_tbl") != 0
|| NIS_RES_OBJECT (result)->EN_data.en_cols.en_cols_len < 2)
return 0;
/* Generate the ether entry format and use the normal parser */
if (NISENTRYLEN (0, 0, result) + 1 > room_left)
{
*errnop = ERANGE;
return -1;
}
char *cp = __stpncpy (p, NISENTRYVAL (0, 0, result),
NISENTRYLEN (0, 0, result));
*cp = '\0';
room_left -= NISENTRYLEN (0, 0, result) + 1;
ether->e_name = p;
struct ether_addr *ea = ether_aton (NISENTRYVAL (0, 1, result));
if (ea == NULL)
{
*errnop = EINVAL;
return -2;
}
ether->e_addr = *ea;
return 1;
}
static enum nss_status
_nss_create_tablename (int *errnop)
{
if (tablename_val == NULL)
{
const char *local_dir = nis_local_directory ();
size_t local_dir_len = strlen (local_dir);
static const char prefix[] = "ethers.org_dir.";
char *p = malloc (sizeof (prefix) + local_dir_len);
if (p == NULL)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
memcpy (__stpcpy (p, prefix), local_dir, local_dir_len + 1);
tablename_len = sizeof (prefix) - 1 + local_dir_len;
atomic_write_barrier ();
tablename_val = p;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nisplus_setetherent (int stayopen)
{
enum nss_status status;
int err;
status = NSS_STATUS_SUCCESS;
__libc_lock_lock (lock);
if (result != NULL)
{
nis_freeresult (result);
result = NULL;
}
if (_nss_create_tablename (&err) != NSS_STATUS_SUCCESS)
status = NSS_STATUS_UNAVAIL;
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nisplus_endetherent (void)
{
__libc_lock_lock (lock);
if (result != NULL)
{
nis_freeresult (result);
result = NULL;
}
__libc_lock_unlock (lock);
return NSS_STATUS_SUCCESS;
}
static enum nss_status
internal_nisplus_getetherent_r (struct etherent *ether, char *buffer,
size_t buflen, int *errnop)
{
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
if (status != NSS_STATUS_SUCCESS)
return status;
}
/* Get the next entry until we found a correct one. */
int parse_res;
do
{
nis_result *saved_result;
if (result == NULL)
{
saved_result = NULL;
result = nis_first_entry (tablename_val);
if (result == NULL)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
return niserr2nss (result->status);
}
else
{
saved_result = result;
result = nis_next_entry (tablename_val, &result->cookie);
if (result == NULL)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
{
nis_freeresult (saved_result);
return niserr2nss (result->status);
}
}
parse_res = _nss_nisplus_parse_etherent (result, ether, buffer,
buflen, errnop);
if (parse_res == -1)
{
nis_freeresult (result);
result = saved_result;
return NSS_STATUS_TRYAGAIN;
}
if (saved_result != NULL)
nis_freeresult (saved_result);
}
while (!parse_res);
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nisplus_getetherent_r (struct etherent *result, char *buffer,
size_t buflen, int *errnop)
{
int status;
__libc_lock_lock (lock);
status = internal_nisplus_getetherent_r (result, buffer, buflen, errnop);
__libc_lock_unlock (lock);
return status;
}
enum nss_status
_nss_nisplus_gethostton_r (const char *name, struct etherent *eth,
char *buffer, size_t buflen, int *errnop)
{
if (tablename_val == NULL)
{
enum nss_status status = _nss_create_tablename (errnop);
if (status != NSS_STATUS_SUCCESS)
return status;
}
if (name == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char buf[strlen (name) + 9 + tablename_len];
int olderr = errno;
snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
NULL, NULL);
if (result == NULL)
{
*errnop = ENOMEM;
return NSS_STATUS_TRYAGAIN;
}
if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
{
enum nss_status status = niserr2nss (result->status);
nis_freeresult (result);
return status;
}
int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
buflen, errnop);
/* We do not need the lookup result anymore. */
nis_freeresult (result);
if (__glibc_unlikely (parse_res < 1))
{
__set_errno (olderr);
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}
enum nss_status
_nss_nisplus_getntohost_r (const struct ether_addr *addr, struct etherent *eth,
char *buffer, size_t buflen, int *errnop)
{
if (tablename_val == NULL)
{
__libc_lock_lock (lock);
enum nss_status status = _nss_create_tablename (errnop);
__libc_lock_unlock (lock);
if (status != NSS_STATUS_SUCCESS)
return status;
}
if (addr == NULL)
{
*errnop = EINVAL;
return NSS_STATUS_UNAVAIL;
}
char buf[26 + tablename_len];
snprintf (buf, sizeof (buf),
"[addr=%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8 ":%" PRIx8
":%" PRIx8 "],%s",
addr->ether_addr_octet[0], addr->ether_addr_octet[1],
addr->ether_addr_octet[2], addr->ether_addr_octet[3],
addr->ether_addr_octet[4], addr->ether_addr_octet[5],
tablename_val);
nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
NULL, NULL);
if (result == NULL)
{
*errnop = ENOMEM;
return NSS_STATUS_TRYAGAIN;
}
if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
{
enum nss_status status = niserr2nss (result->status);
nis_freeresult (result);
return status;
}
int parse_res = _nss_nisplus_parse_etherent (result, eth, buffer,
buflen, errnop);
/* We do not need the lookup result anymore. */
nis_freeresult (result);
if (__glibc_unlikely (parse_res < 1))
{
if (parse_res == -1)
return NSS_STATUS_TRYAGAIN;
return NSS_STATUS_NOTFOUND;
}
return NSS_STATUS_SUCCESS;
}