-/* Copyright (C) 1997, 1998, 2001, 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
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. */
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
-#include <nss.h>
-#include <errno.h>
+#include <atomic.h>
#include <ctype.h>
+#include <errno.h>
+#include <nss.h>
#include <string.h>
-#include <bits/libc-lock.h>
#include <rpc/netdb.h>
#include <rpcsvc/nis.h>
+#include <libc-lock.h>
#include "nss-nisplus.h"
static nis_name tablename_val;
static u_long tablename_len;
-#define NISENTRYVAL(idx,col,res) \
- ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_val)
+#define NISENTRYVAL(idx, col, res) \
+ (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_val)
+
+#define NISENTRYLEN(idx, col, res) \
+ (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_len)
-#define NISENTRYLEN(idx,col,res) \
- ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
static int
_nss_nisplus_parse_rpcent (nis_result *result, struct rpcent *rpc,
char *first_unused = buffer;
size_t room_left = buflen;
unsigned int i;
- char *p, *line;
+ char *line;
if (result == NULL)
return 0;
if ((result->status != NIS_SUCCESS && result->status != NIS_S_SUCCESS)
- || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
- || strcmp (result->objects.objects_val[0].EN_data.en_type,
- "rpc_tbl") != 0
- || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
+ || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
+ || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type, "rpc_tbl") != 0
+ || NIS_RES_OBJECT (result)[0].EN_data.en_cols.en_cols_len < 3)
return 0;
if (NISENTRYLEN (0, 0, result) >= room_left)
NISENTRYLEN (0, 0, result));
first_unused[NISENTRYLEN (0, 0, result)] = '\0';
rpc->r_name = first_unused;
- room_left -= (strlen (first_unused) + 1);
- first_unused += strlen (first_unused) + 1;
+ size_t len = strlen (first_unused) + 1;
+ room_left -= len;
+ first_unused += len;
+
rpc->r_number = atoi (NISENTRYVAL (0, 2, result));
- p = first_unused;
- line = p;
- for (i = 0; i < result->objects.objects_len; ++i)
+ /* XXX Rewrite at some point to allocate the array first and then
+ copy the strings. It wasteful to first concatenate the strings
+ to just split them again later. */
+ line = first_unused;
+ for (i = 0; i < NIS_RES_NUMOBJ (result); ++i)
{
if (strcmp (NISENTRYVAL (i, 1, result), rpc->r_name) != 0)
{
if (NISENTRYLEN (i, 1, result) + 2 > room_left)
goto no_more_room;
- *p++ = ' ';
- p = __stpncpy (p, NISENTRYVAL (i, 1, result),
- NISENTRYLEN (i, 1, result));
- *p = '\0';
- room_left -= (NISENTRYLEN (i, 1, result) + 1);
+ *first_unused++ = ' ';
+ first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
+ NISENTRYLEN (i, 1, result));
+ room_left -= NISENTRYLEN (i, 1, result) + 1;
}
}
- ++p;
- first_unused = p;
+ *first_unused++ = '\0';
/* Adjust the pointer so it is aligned for
storing pointers. */
- first_unused += __alignof__ (char *) - 1;
- first_unused -= ((first_unused - (char *) 0) % __alignof__ (char *));
- rpc->r_aliases = (char **) first_unused;
- if (room_left < sizeof (char *))
+ size_t adjust = ((__alignof__ (char *)
+ - (first_unused - (char *) 0) % __alignof__ (char *))
+ % __alignof__ (char *));
+ if (room_left < adjust + sizeof (char *))
goto no_more_room;
+ first_unused += adjust;
+ room_left -= adjust;
+ rpc->r_aliases = (char **) first_unused;
+
+ /* For the terminating NULL pointer. */
room_left -= sizeof (char *);
- rpc->r_aliases[0] = NULL;
i = 0;
while (*line != '\0')
goto no_more_room;
room_left -= sizeof (char *);
- rpc->r_aliases[i] = line;
+ rpc->r_aliases[i++] = line;
while (*line != '\0' && *line != ' ')
++line;
if (*line == ' ')
- {
- *line = '\0';
- ++line;
- ++i;
- }
- else
- rpc->r_aliases[i+1] = NULL;
+ *line++ = '\0';
}
+ rpc->r_aliases[i] = NULL;
return 1;
}
+
static enum nss_status
_nss_create_tablename (int *errnop)
{
if (tablename_val == NULL)
{
- char buf [40 + strlen (nis_local_directory ())];
- char *p;
+ const char *local_dir = nis_local_directory ();
+ size_t local_dir_len = strlen (local_dir);
+ static const char prefix[] = "rpc.org_dir.";
- p = __stpcpy (buf, "rpc.org_dir.");
- p = __stpcpy (p, nis_local_directory ());
- tablename_val = __strdup (buf);
- if (tablename_val == NULL)
+ char *p = malloc (sizeof (prefix) + local_dir_len);
+ if (p == NULL)
{
*errnop = errno;
return NSS_STATUS_TRYAGAIN;
}
- tablename_len = strlen (tablename_val);
+
+ 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;
}
_nss_nisplus_setrpcent (int stayopen)
{
enum nss_status status = NSS_STATUS_SUCCESS;
- int err;
__libc_lock_lock (lock);
- if (result)
- nis_freeresult (result);
- result = NULL;
+ if (result != NULL)
+ {
+ nis_freeresult (result);
+ result = NULL;
+ }
if (tablename_val == NULL)
- status = _nss_create_tablename (&err);
+ {
+ int err;
+ status = _nss_create_tablename (&err);
+ }
__libc_lock_unlock (lock);
{
__libc_lock_lock (lock);
- if (result)
- nis_freeresult (result);
- result = NULL;
+ if (result != NULL)
+ {
+ nis_freeresult (result);
+ result = NULL;
+ }
__libc_lock_unlock (lock);
}
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
{
- nis_result *res;
-
saved_res = result;
- res = nis_next_entry (tablename_val, &result->cookie);
- result = res;
+ 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_res);
if (saved_res)
nis_freeresult (saved_res);
}
- } while (!parse_res);
+ }
+ while (!parse_res);
return NSS_STATUS_SUCCESS;
}
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 (name == NULL)
return NSS_STATUS_NOTFOUND;
- else
- {
- nis_result *result;
- char buf[strlen (name) + 255 + tablename_len];
- int olderr = errno;
- /* Search at first in the alias list, and use the correct name
- for the next search */
- sprintf (buf, "[name=%s],%s", name, tablename_val);
- result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS, NULL, NULL);
+ char buf[strlen (name) + 10 + tablename_len];
+ int olderr = errno;
- if (result != NULL)
- {
- /* If we do not find it, try it as original name. But if the
- database is correct, we should find it in the first case, too */
- if ((result->status != NIS_SUCCESS
- && result->status != NIS_S_SUCCESS)
- || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
- || strcmp (result->objects.objects_val->EN_data.en_type,
- "rpc_tbl") != 0
- || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
- sprintf (buf, "[cname=%s],%s", name, tablename_val);
- else
- sprintf (buf, "[cname=%s],%s", NISENTRYVAL (0, 0, result),
- tablename_val);
+ /* Search at first in the alias list, and use the correct name
+ for the next search */
+ snprintf (buf, sizeof (buf), "[name=%s],%s", name, tablename_val);
+ nis_result *result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
+ NULL, NULL);
- nis_freeresult (result);
- result = nis_list (buf, FOLLOW_PATH | FOLLOW_LINKS , NULL, NULL);
- }
-
- if (result == NULL)
+ if (result != NULL)
+ {
+ char *bufptr = buf;
+
+ /* If we did not find it, try it as original name. But if the
+ database is correct, we should find it in the first case, too */
+ if ((result->status != NIS_SUCCESS
+ && result->status != NIS_S_SUCCESS)
+ || __type_of (result->objects.objects_val) != NIS_ENTRY_OBJ
+ || strcmp (result->objects.objects_val->EN_data.en_type,
+ "rpc_tbl") != 0
+ || result->objects.objects_val->EN_data.en_cols.en_cols_len < 3)
+ snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
+ else
{
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
+ /* We need to allocate a new buffer since there is no
+ guarantee the returned name has a length limit. */
+ const char *entryval = NISENTRYVAL (0, 0, result);
+ size_t buflen = strlen (entryval) + 10 + tablename_len;
+ bufptr = alloca (buflen);
+ snprintf (bufptr, buflen, "[cname=%s],%s",
+ entryval, tablename_val);
}
- if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
- {
- enum nss_status status = niserr2nss (result->status);
- __set_errno (olderr);
+ nis_freeresult (result);
+ result = nis_list (bufptr, FOLLOW_PATH | FOLLOW_LINKS | USE_DGRAM,
+ NULL, NULL);
+ }
- nis_freeresult (result);
- return status;
- }
+ if (result == NULL)
+ {
+ *errnop = ENOMEM;
+ return NSS_STATUS_TRYAGAIN;
+ }
- parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
- errnop);
+ if (__glibc_unlikely (niserr2nss (result->status) != NSS_STATUS_SUCCESS))
+ {
+ enum nss_status status = niserr2nss (result->status);
+
+ __set_errno (olderr);
nis_freeresult (result);
+ return status;
+ }
- if (parse_res < 1)
- {
- if (parse_res == -1)
- {
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
+ parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
+ errnop);
- __set_errno (olderr);
- return NSS_STATUS_NOTFOUND;
+ nis_freeresult (result);
+
+ if (parse_res < 1)
+ {
+ if (parse_res == -1)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
}
- return NSS_STATUS_SUCCESS;
+
+ __set_errno (olderr);
+ return NSS_STATUS_NOTFOUND;
}
+
+ return NSS_STATUS_SUCCESS;
}
enum nss_status
{
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;
}
- {
- int parse_res;
- nis_result *result;
- char buf[100 + tablename_len];
- int olderr = errno;
+ char buf[12 + 3 * sizeof (number) + tablename_len];
+ int olderr = errno;
- sprintf (buf, "[number=%d],%s", number, tablename_val);
+ snprintf (buf, sizeof (buf), "[number=%d],%s", number, tablename_val);
- result = nis_list(buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+ nis_result *result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH | USE_DGRAM,
+ NULL, NULL);
- if (result == NULL)
- {
- *errnop = ENOMEM;
- return NSS_STATUS_TRYAGAIN;
- }
- if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
- {
- enum nss_status status = niserr2nss (result->status);
+ if (result == NULL)
+ {
+ *errnop = ENOMEM;
+ return NSS_STATUS_TRYAGAIN;
+ }
- __set_errno (olderr);
+ if (__builtin_expect (niserr2nss (result->status) != NSS_STATUS_SUCCESS, 0))
+ {
+ enum nss_status status = niserr2nss (result->status);
- nis_freeresult (result);
- return status;
- }
-
- parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
- errnop);
-
- nis_freeresult (result);
-
- if (parse_res < 1)
- {
- if (parse_res == -1)
- {
- *errnop = ERANGE;
- return NSS_STATUS_TRYAGAIN;
- }
- else
- {
- __set_errno (olderr);
- return NSS_STATUS_NOTFOUND;
- }
- }
- return NSS_STATUS_SUCCESS;
- }
+ __set_errno (olderr);
+
+ nis_freeresult (result);
+ return status;
+ }
+
+ int parse_res = _nss_nisplus_parse_rpcent (result, rpc, buffer, buflen,
+ errnop);
+
+ nis_freeresult (result);
+
+ if (parse_res < 1)
+ {
+ if (parse_res == -1)
+ {
+ *errnop = ERANGE;
+ return NSS_STATUS_TRYAGAIN;
+ }
+ else
+ {
+ __set_errno (olderr);
+ return NSS_STATUS_NOTFOUND;
+ }
+ }
+
+ return NSS_STATUS_SUCCESS;
}
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