* nis/nss-default.c (vars): Add SETENT_BATCH_READ.

	* nis/nss: Document SETENT_BATCH_READ.
	* nis/libnsl.h: Define NSS_FLAG_SETENT_BATCH_READ.
	* nis/nss_nis/nis-service.c (saveit): Don't add NUL byte if the
	string is already NUL terminated.
	(internal_nis_endservent): No need to return anything.  Change callers.
	(internal_nis_setservent): One more initialization.
	* nis/nss_nis/nis-pwd.c: Support SETENT_BATCH_READ option.
	* nis/nss_nis/nis-grp.c: Likewise.

	* nis/nss-default.c (init): Rewrite parser to get the variables

1 files changed, 220 insertions, 39 deletions

diff --git a/nis/nss_nis/nis-pwd.c b/nis/nss_nis/nis-pwd.c
index 457574a49b..a996b042c4 100644
--- a/nis/nss_nis/nis-pwd.c
+++ b/nis/nss_nis/nis-pwd.c
@@ -17,20 +17,18 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <nss.h>
-/* The following is an ugly trick to avoid a prototype declaration for
-   _nss_nis_endpwent.  */
-#define _nss_nis_endpwent _nss_nis_endpwent_XXX
-#include <pwd.h>
-#undef _nss_nis_endpwent
+#include <assert.h>
 #include <ctype.h>
 #include <errno.h>
+#include <nss.h>
+#include <pwd.h>
 #include <string.h>
 #include <bits/libc-lock.h>
 #include <rpcsvc/yp.h>
 #include <rpcsvc/ypclnt.h>
 
 #include "nss-nis.h"
+#include <libnsl.h>
 
 /* Get the declaration of the parser function.  */
 #define ENTNAME pwent
@@ -45,11 +43,84 @@ static bool_t new_start = 1;
 static char *oldkey;
 static int oldkeylen;
 
-enum nss_status
-_nss_nis_setpwent (int stayopen)
+struct response_t
 {
-  __libc_lock_lock (lock);
+  struct response_t *next;
+  size_t size;
+  char mem[0];
+};
+
+typedef struct intern_t
+{
+  struct response_t *start;
+  struct response_t *next;
+  size_t offset;
+} intern_t;
+
+static intern_t intern;
+
+
+static int
+saveit (int instatus, char *inkey, int inkeylen, char *inval,
+        int invallen, char *indata)
+{
+  if (instatus != YP_TRUE)
+    return 1;
+
+  if (inkey && inkeylen > 0 && inval && invallen > 0)
+    {
+      struct response_t *bucket = intern.next;
+
+      if (__builtin_expect (bucket == NULL, 0))
+	{
+#define MINSIZE 4096 - 4 * sizeof (void *)
+	  const size_t minsize = MAX (MINSIZE, 2 * (invallen + 1));
+	  bucket = malloc (sizeof (struct response_t) + minsize);
+	  if (bucket == NULL)
+	    /* We have no error code for out of memory.  */
+	    return 1;
+
+	  bucket->next = NULL;
+	  bucket->size = minsize;
+	  intern.start = intern.next = bucket;
+	  intern.offset = 0;
+	}
+      else if (__builtin_expect (invallen + 1 > bucket->size - intern.offset,
+				 0))
+	{
+	  /* We need a new (larger) buffer.  */
+	  const size_t newsize = 2 * MAX (bucket->size, invallen + 1);
+	  struct response_t *newp = malloc (sizeof (struct response_t)
+					    + newsize);
+	  if (newp == NULL)
+	    /* We have no error code for out of memory.  */
+	    return 1;
+
+	  /* Mark the old bucket as full.  */
+	  bucket->size = intern.offset;
+
+	  newp->next = NULL;
+	  newp->size = newsize;
+	  bucket = intern.next = bucket->next = newp;
+	  intern.offset = 0;
+	}
+
+      char *p = mempcpy (&bucket->mem[intern.offset], inval, invallen);
+      if (__builtin_expect (p[-1] != '\0', 0))
+	{
+	  *p = '\0';
+	  ++invallen;
+	}
+      intern.offset += invallen;
+    }
 
+  return 0;
+}
+
+
+static void
+internal_nis_endpwent (void)
+{
   new_start = 1;
   if (oldkey != NULL)
     {
@@ -58,21 +129,86 @@ _nss_nis_setpwent (int stayopen)
       oldkeylen = 0;
     }
 
+  struct response_t *curr = intern.next;
+
+  while (curr != NULL)
+    {
+      struct response_t *last = curr;
+      curr = curr->next;
+      free (last);
+    }
+
+  intern.next = intern.start = NULL;
+}
+
+
+enum nss_status
+_nss_nis_endpwent (void)
+{
+  __libc_lock_lock (lock);
+
+  internal_nis_endpwent ();
+
   __libc_lock_unlock (lock);
 
   return NSS_STATUS_SUCCESS;
 }
-/* Make _nss_nis_endpwent an alias of _nss_nis_setpwent.  We do this
-   even though the prototypes don't match.  The argument of setpwent
-   is not used so this makes no difference.  */
-strong_alias (_nss_nis_setpwent, _nss_nis_endpwent)
+
+
+enum nss_status
+internal_nis_setpwent (void)
+{
+  /* We have to read all the data now.  */
+  char *domain;
+  if (__builtin_expect (yp_get_default_domain (&domain), 0))
+    return NSS_STATUS_UNAVAIL;
+
+  struct ypall_callback ypcb;
+
+  ypcb.foreach = saveit;
+  ypcb.data = NULL;
+  enum nss_status status = yperr2nss (yp_all (domain, "passwd.byname", &ypcb));
+
+
+  /* Mark the last buffer as full.  */
+  if (intern.next != NULL)
+    intern.next->size = intern.offset;
+
+  intern.next = intern.start;
+  intern.offset = 0;
+
+  return status;
+}
+
+
+enum nss_status
+_nss_nis_setpwent (int stayopen)
+{
+  enum nss_status result = NSS_STATUS_SUCCESS;
+
+  __libc_lock_lock (lock);
+
+  internal_nis_endpwent ();
+
+  if (_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
+    result = internal_nis_setpwent ();
+
+  __libc_lock_unlock (lock);
+
+  return result;
+}
+
 
 static enum nss_status
 internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 			 int *errnop)
 {
-  char *domain;
-  if (__builtin_expect (yp_get_default_domain (&domain), 0))
+  /* If we read the entire database at setpwent time we just iterate
+     over the data we have in memory.  */
+  bool batch_read = intern.start != NULL;
+
+  char *domain = NULL;
+  if (!batch_read && __builtin_expect (yp_get_default_domain (&domain), 0))
     return NSS_STATUS_UNAVAIL;
 
   /* Get the next entry until we found a correct one. */
@@ -83,23 +219,62 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
       char *outkey;
       int len;
       int keylen;
-      int yperr;
 
-      if (new_start)
-        yperr = yp_first (domain, "passwd.byname", &outkey, &keylen, &result,
-			  &len);
+      if (batch_read)
+	{
+	  struct response_t *bucket;
+
+	handle_batch_read:
+	  bucket = intern.next;
+
+	  if (__builtin_expect (intern.offset >= bucket->size, 0))
+	    {
+	      if (bucket->next == NULL)
+		return NSS_STATUS_NOTFOUND;
+
+	      /* We look at all the content in the current bucket.  Go on
+		 to the next.  */
+	      bucket = intern.next = bucket->next;
+	      intern.offset = 0;
+	    }
+
+	  for (result = &bucket->mem[intern.offset]; isspace (*result);
+	       ++result)
+	    ++intern.offset;
+
+	  len = strlen (result);
+	}
       else
-        yperr = yp_next (domain, "passwd.byname", oldkey, oldkeylen, &outkey,
-			 &keylen, &result, &len);
+	{
+	  int yperr;
 
-      if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
-        {
-	  enum nss_status retval = yperr2nss (yperr);
+	  if (new_start)
+	    {
+	      /* Maybe we should read the database in one piece.  */
+	      if ((_nsl_default_nss () & NSS_FLAG_SETENT_BATCH_READ)
+		  && internal_nis_setpwent () == NSS_STATUS_SUCCESS
+		  && intern.start != NULL)
+		{
+		  batch_read = true;
+		  goto handle_batch_read;
+		}
+
+	      yperr = yp_first (domain, "passwd.byname", &outkey, &keylen,
+				&result, &len);
+	    }
+	  else
+	    yperr = yp_next (domain, "passwd.byname", oldkey, oldkeylen,
+			     &outkey, &keylen, &result, &len);
+
+	  if (__builtin_expect (yperr != YPERR_SUCCESS, 0))
+	    {
+	      enum nss_status retval = yperr2nss (yperr);
 
-          if (retval == NSS_STATUS_TRYAGAIN)
-            *errnop = errno;
-          return retval;
-        }
+	      if (retval == NSS_STATUS_TRYAGAIN)
+		*errnop = errno;
+	      return retval;
+	    }
+	}
 
       /* Check for adjunct style secret passwords.  They can be
 	 recognized by a password starting with "##".  */
@@ -140,10 +315,10 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 	      return NSS_STATUS_TRYAGAIN;
 	    }
 
-	  __mempcpy (__mempcpy (__mempcpy (__mempcpy (buffer, result, namelen),
-					   ":", 1),
-				encrypted, endp - encrypted),
-		     p, restlen + 1);
+	  mempcpy (mempcpy (mempcpy (mempcpy (buffer, result, namelen),
+				     ":", 1),
+			    encrypted, endp - encrypted),
+		   p, restlen + 1);
 	  p = buffer;
 
 	  free (result2);
@@ -158,13 +333,14 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 	      return NSS_STATUS_TRYAGAIN;
 	    }
 
-	  p = strncpy (buffer, result, len);
-	  buffer[len] = '\0';
+	  p = buffer;
+	  *((char *) mempcpy (buffer, result, len)) = '\0';
 	}
 
       while (isspace (*p))
         ++p;
-      free (result);
+      if (!batch_read)
+	free (result);
 
       parse_res = _nss_files_parse_pwent (p, pwd, (void *) buffer, buflen,
 					  errnop);
@@ -175,10 +351,15 @@ internal_nis_getpwent_r (struct passwd *pwd, char *buffer, size_t buflen,
 	  return NSS_STATUS_TRYAGAIN;
 	}
 
-      free (oldkey);
-      oldkey = outkey;
-      oldkeylen = keylen;
-      new_start = 0;
+      if (batch_read)
+	intern.offset += len + 1;
+      else
+	{
+	  free (oldkey);
+	  oldkey = outkey;
+	  oldkeylen = keylen;
+	  new_start = 0;
+	}
     }
   while (parse_res < 1);