1 files changed, 118 insertions, 97 deletions

diff --git a/nis/nss_nisplus/nisplus-network.c b/nis/nss_nisplus/nisplus-network.c
index 422b02b82a..1cd7cf2588 100644
--- a/nis/nss_nisplus/nisplus-network.c
+++ b/nis/nss_nisplus/nisplus-network.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1997,1998,2000,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2000-2003,2005 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by Thorsten Kukuk <kukuk@vt.uni-paderborn.de>, 1997.
 
@@ -17,15 +17,16 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-#include <netdb.h>
-#include <errno.h>
+#include <atomic.h>
 #include <ctype.h>
+#include <errno.h>
+#include <netdb.h>
+#include <nss.h>
 #include <stdint.h>
 #include <string.h>
 #include <arpa/inet.h>
-#include <bits/libc-lock.h>
 #include <rpcsvc/nis.h>
+#include <bits/libc-lock.h>
 
 #include "nss-nisplus.h"
 
@@ -44,12 +45,10 @@ static u_long tablename_len;
 
 static int
 _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
-			    char *buffer, size_t buflen, int *errnop)
+			   char *buffer, size_t buflen, int *errnop)
 {
   char *first_unused = buffer;
   size_t room_left = buflen;
-  unsigned int i;
-  char *p, *line;
 
   if (result == NULL)
     return 0;
@@ -61,7 +60,7 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
       || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
     return 0;
 
-  if (NISENTRYLEN(0, 0, result) >= room_left)
+  if (NISENTRYLEN (0, 0, result) >= room_left)
     {
       /* The line is too long for our buffer.  */
     no_more_room:
@@ -69,7 +68,7 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
       return -1;
     }
 
-  strncpy (first_unused, NISENTRYVAL(0, 0, result),
+  strncpy (first_unused, NISENTRYVAL (0, 0, result),
            NISENTRYLEN (0, 0, result));
   first_unused[NISENTRYLEN (0, 0, result)] = '\0';
   network->n_name = first_unused;
@@ -77,10 +76,10 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
   first_unused += strlen (first_unused) +1;
   network->n_addrtype = 0;
   network->n_net = inet_network (NISENTRYVAL (0, 2, result));
-  p = first_unused;
+  char *p = first_unused;
 
-  line = p;
-  for (i = 0; i < result->objects.objects_len; ++i)
+  char *line = p;
+  for (unsigned int i = 0; i < result->objects.objects_len; ++i)
     {
       if (strcmp (NISENTRYVAL (i, 1, result), network->n_name) != 0)
         {
@@ -107,12 +106,12 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
   room_left -= (2 * sizeof (char *));
   network->n_aliases[0] = NULL;
 
-  i = 0;
+  unsigned int i = 0;
   while (*line != '\0')
     {
       /* Skip leading blanks.  */
       while (isspace (*line))
-        line++;
+        ++line;
 
       if (*line == '\0')
         break;
@@ -133,7 +132,7 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
           ++i;
         }
       else
-        network->n_aliases[i+1] = NULL;
+        network->n_aliases[i + 1] = NULL;
     }
 
   return 1;
@@ -144,19 +143,26 @@ _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[] = "networks.org_dir.";
 
-      p = __stpcpy (buf, "networks.org_dir.");
-      p = __stpcpy (p, nis_local_directory ());
-      tablename_val = __strdup (buf);
+      char *p = malloc (sizeof (prefix) + local_dir_len);
       if (tablename_val == 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;
 }
 
@@ -164,16 +170,20 @@ enum nss_status
 _nss_nisplus_setnetent (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);
 
@@ -185,9 +195,11 @@ _nss_nisplus_endnetent (void)
 {
   __libc_lock_lock (lock);
 
-  if (result)
-    nis_freeresult (result);
-  result = NULL;
+  if (result != NULL)
+    {
+      nis_freeresult (result);
+      result = NULL;
+    }
 
   __libc_lock_unlock (lock);
 
@@ -220,9 +232,7 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 	  result = nis_first_entry (tablename_val);
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
-	      int retval;
-
-	      retval = niserr2nss (result->status);
+	      int retval = niserr2nss (result->status);
 	      nis_freeresult (result);
 	      result = NULL;
 	      if (retval == NSS_STATUS_TRYAGAIN)
@@ -237,16 +247,12 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 	}
       else
 	{
-	  nis_result *res;
-
-	  res = nis_next_entry (tablename_val, &result->cookie);
+	  nis_result *res = nis_next_entry (tablename_val, &result->cookie);
 	  saved_res = result;
 	  result = res;
 	  if (niserr2nss (result->status) != NSS_STATUS_SUCCESS)
 	    {
-	      int retval;
-
-	      retval = niserr2nss (result->status);
+	      int retval = niserr2nss (result->status);
 	      nis_freeresult (result);
 	      result = saved_res;
 	      if (retval == NSS_STATUS_TRYAGAIN)
@@ -266,7 +272,8 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
           return NSS_STATUS_TRYAGAIN;
         }
 
-    } while (!parse_res);
+    }
+  while (!parse_res);
 
   return NSS_STATUS_SUCCESS;
 }
@@ -296,8 +303,12 @@ _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
 
   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;
     }
@@ -308,76 +319,82 @@ _nss_nisplus_getnetbyname_r (const char *name, struct netent *network,
       *herrnop = NETDB_INTERNAL;
       return NSS_STATUS_UNAVAIL;
     }
-  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_LINKS | FOLLOW_PATH, NULL, NULL);
+  nis_result *result;
+  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[0].EN_data.en_type,
-			 "networks_tbl") != 0
-	      || (result->objects.objects_val[0].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);
-
-	  nis_freeresult (result);
-	  result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
-	}
+  /* 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);
+  result = nis_list (buf, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
 
-      if (result == NULL)
-	{
-	  __set_errno (ENOMEM);
-	  return NSS_STATUS_TRYAGAIN;
-	}
-      retval = niserr2nss (result->status);
-      if (retval != NSS_STATUS_SUCCESS)
+  if (result != NULL)
+    {
+      char *bufptr = buf;
+
+      /* 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[0].EN_data.en_type,
+		     "networks_tbl") != 0
+	  || (result->objects.objects_val[0].EN_data.en_cols.en_cols_len
+	      < 3))
+	snprintf (buf, sizeof (buf), "[cname=%s],%s", name, tablename_val);
+      else
 	{
-	  if (retval == NSS_STATUS_TRYAGAIN)
-	    {
-	      *errnop = errno;
-	      *herrnop = NETDB_INTERNAL;
-	    }
-	  else
-	    __set_errno (olderr);
-	  nis_freeresult (result);
-	  return retval;
+	  /* 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);
 	}
 
-      parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
-					     errnop);
-
       nis_freeresult (result);
+      result = nis_list (bufptr, FOLLOW_LINKS | FOLLOW_PATH, NULL, NULL);
+    }
 
-      if (parse_res > 0)
-	return NSS_STATUS_SUCCESS;
+  if (result == NULL)
+    {
+      __set_errno (ENOMEM);
+      return NSS_STATUS_TRYAGAIN;
+    }
 
-      *herrnop = NETDB_INTERNAL;
-      if (parse_res == -1)
+  retval = niserr2nss (result->status);
+  if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
+    {
+      if (retval == NSS_STATUS_TRYAGAIN)
 	{
-	  *errnop = ERANGE;
-	  return NSS_STATUS_TRYAGAIN;
+	  *errnop = errno;
+	  *herrnop = NETDB_INTERNAL;
 	}
       else
-	{
-	  __set_errno (olderr);
-	  return NSS_STATUS_NOTFOUND;
-	}
+	__set_errno (olderr);
+      nis_freeresult (result);
+      return retval;
     }
+
+  parse_res = _nss_nisplus_parse_netent (result, network, buffer, buflen,
+					 errnop);
+
+  nis_freeresult (result);
+
+  if (parse_res > 0)
+    return NSS_STATUS_SUCCESS;
+
+  *herrnop = NETDB_INTERNAL;
+  if (parse_res == -1)
+    {
+      *errnop = ERANGE;
+      return NSS_STATUS_TRYAGAIN;
+    }
+
+  __set_errno (olderr);
+  return NSS_STATUS_NOTFOUND;
 }
 
 /* XXX type is ignored, SUN's NIS+ table doesn't support it */
@@ -388,8 +405,12 @@ _nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type,
 {
   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;
     }