1 files changed, 174 insertions, 144 deletions

diff --git a/nis/nss_nisplus/nisplus-network.c b/nis/nss_nisplus/nisplus-network.c
index 422b02b82a..1cf652f071 100644
--- a/nis/nss_nisplus/nisplus-network.c
+++ b/nis/nss_nisplus/nisplus-network.c
@@ -1,4 +1,5 @@
-/* Copyright (C) 1997,1998,2000,2001,2002,2003 Free Software Foundation, Inc.
+/* Copyright (C) 1997,1998,2000-2003,2005,2006,2007
+   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 +18,16 @@
    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"
 
@@ -35,33 +37,31 @@ static nis_result *result;
 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) \
-        ((res)->objects.objects_val[(idx)].EN_data.en_cols.en_cols_val[(col)].ec_value.ec_value_len)
+#define NISENTRYLEN(idx, col, res) \
+        (NIS_RES_OBJECT (res)[idx].EN_data.en_cols.en_cols_val[col].ec_value.ec_value_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;
 
   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,
+      || __type_of (NIS_RES_OBJECT (result)) != NIS_ENTRY_OBJ
+      || strcmp (NIS_RES_OBJECT (result)[0].EN_data.en_type,
 		 "networks_tbl") != 0
-      || result->objects.objects_val[0].EN_data.en_cols.en_cols_len < 3)
+      || NIS_RES_OBJECT (result)[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:
@@ -69,50 +69,56 @@ _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;
-  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;
+
   network->n_addrtype = 0;
   network->n_net = inet_network (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.  */
+  char *line = first_unused;
+  for (unsigned int i = 0; i < NIS_RES_NUMOBJ (result); ++i)
     {
       if (strcmp (NISENTRYVAL (i, 1, result), network->n_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';
+	  *first_unused++ = ' ';
+          first_unused = __stpncpy (first_unused, NISENTRYVAL (i, 1, result),
+				    NISENTRYLEN (i, 1, result));
           room_left -= (NISENTRYLEN (i, 1, result) + 1);
         }
     }
-  *p++ = '\0';
-  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 *));
-  network->n_aliases = (char **) first_unused;
-  if (room_left < 2 * 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;
-  room_left -= (2 * sizeof (char *));
-  network->n_aliases[0] = NULL;
+  first_unused += adjust;
+  room_left -= adjust;
+  network->n_aliases = (char **) first_unused;
+
+  /* For the terminating NULL pointer.  */
+  room_left -= sizeof (char *);
 
-  i = 0;
+  unsigned int i = 0;
   while (*line != '\0')
     {
       /* Skip leading blanks.  */
       while (isspace (*line))
-        line++;
+        ++line;
 
       if (*line == '\0')
         break;
@@ -121,42 +127,45 @@ _nss_nisplus_parse_netent (nis_result *result, struct netent *network,
 	goto no_more_room;
 
       room_left -= sizeof (char *);
-      network->n_aliases[i] = line;
+      network->n_aliases[i++] = line;
 
       while (*line != '\0' && *line != ' ')
         ++line;
 
       if (*line == ' ')
-	{
-	  *line = '\0';
-	  ++line;
-          ++i;
-        }
-      else
-        network->n_aliases[i+1] = NULL;
+	*line++ = '\0';
     }
+  network->n_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[] = "networks.org_dir.";
 
-      p = __stpcpy (buf, "networks.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;
 }
 
@@ -164,16 +173,20 @@ 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 +198,11 @@ _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);
 
@@ -218,11 +233,14 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 	    }
 
 	  result = nis_first_entry (tablename_val);
+	  if (result == NULL)
+	    {
+	      *errnop = errno;
+	      return NSS_STATUS_TRYAGAIN;
+	    }
 	  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 +255,16 @@ internal_nisplus_getnetent_r (struct netent *network, char *buffer,
 	}
       else
 	{
-	  nis_result *res;
-
-	  res = nis_next_entry (tablename_val, &result->cookie);
 	  saved_res = result;
-	  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)
 	    {
-	      int retval;
-
-	      retval = niserr2nss (result->status);
+	      int retval = niserr2nss (result->status);
 	      nis_freeresult (result);
 	      result = saved_res;
 	      if (retval == NSS_STATUS_TRYAGAIN)
@@ -266,7 +284,8 @@ 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 +315,12 @@ _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 +331,83 @@ _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 | USE_DGRAM, 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 | USE_DGRAM,
+			 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 */
@@ -388,48 +418,48 @@ _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;
     }
 
   {
-    int parse_res, retval;
-    nis_result *result;
-    char buf[1024 + tablename_len];
-    struct in_addr in;
-    char buf2[256];
-    int b2len;
+    char buf[27 + tablename_len];
+    char buf2[18];
     int olderr = errno;
 
-    in = inet_makeaddr (addr, 0);
+    struct in_addr in = inet_makeaddr (addr, 0);
     strcpy (buf2, inet_ntoa (in));
-    b2len = strlen (buf2);
+    size_t b2len = strlen (buf2);
 
     while (1)
       {
-	sprintf (buf, "[addr=%s],%s", buf2, tablename_val);
-	result = nis_list (buf, EXPAND_NAME, NULL, NULL);
+	snprintf (buf, sizeof (buf), "[addr=%s],%s", buf2, tablename_val);
+	nis_result *result = nis_list (buf, EXPAND_NAME | USE_DGRAM,
+				       NULL, NULL);
 
 	if (result == NULL)
 	  {
 	    __set_errno (ENOMEM);
 	    return NSS_STATUS_TRYAGAIN;
 	  }
-	retval = niserr2nss (result->status);
-	if (retval != NSS_STATUS_SUCCESS)
+	enum nss_status retval = niserr2nss (result->status);
+	if (__builtin_expect (retval != NSS_STATUS_SUCCESS, 0))
 	  {
-	    if (buf2[b2len -2] == '.' && buf2[b2len -1] == '0')
+	    if (b2len > 2 && buf2[b2len - 2] == '.' && buf2[b2len - 1] == '0')
 	      {
 		/* Try again, but with trailing dot(s)
 		   removed (one by one) */
 		buf2[b2len - 2] = '\0';
 		b2len -= 2;
+		nis_freeresult (result);
 		continue;
 	      }
-	    else
-	      return NSS_STATUS_NOTFOUND;
 
 	    if (retval == NSS_STATUS_TRYAGAIN)
 	      {
@@ -442,8 +472,8 @@ _nss_nisplus_getnetbyaddr_r (uint32_t addr, const int type,
 	    return retval;
 	  }
 
-	parse_res = _nss_nisplus_parse_netent (result, network, buffer,
-					       buflen, errnop);
+	int parse_res = _nss_nisplus_parse_netent (result, network, buffer,
+						   buflen, errnop);
 
 	nis_freeresult (result);