1 files changed, 127 insertions, 0 deletions
diff --git a/nis/nss-default.c b/nis/nss-default.c
new file mode 100644
index 0000000000..046ddfee8d
--- /dev/null
+++ b/nis/nss-default.c
@@ -0,0 +1,127 @@
+/* Copyright (C) 1996, 2001, 2004, 2006, 2007 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <ctype.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <string.h>
+#include <bits/libc-lock.h>
+
+#include <libnsl.h>
+
+
+/* Path of the file.  */
+static const char default_nss[] = "/etc/default/nss";
+
+/* Flags once read from the file.  */
+static int default_nss_flags;
+
+/* Code to make sure we call 'init' once.  */
+__libc_once_define (static, once);
+
+/* Table of the recognized variables.  */
+static const struct
+{
+  char name[23];
+  unsigned int len;
+  int flag;
+} vars[] =
+  {
+#define STRNLEN(s) s, sizeof (s) - 1
+    { STRNLEN ("NETID_AUTHORITATIVE"), NSS_FLAG_NETID_AUTHORITATIVE },
+    { STRNLEN ("SERVICES_AUTHORITATIVE"), NSS_FLAG_SERVICES_AUTHORITATIVE },
+    { STRNLEN ("SETENT_BATCH_READ"), NSS_FLAG_SETENT_BATCH_READ }
+  };
+#define nvars (sizeof (vars) / sizeof (vars[0]))
+
+
+static void
+init (void)
+{
+  int saved_errno = errno;
+  FILE *fp = fopen (default_nss, "rc");
+  if (fp != NULL)
+    {
+      char *line = NULL;
+      size_t linelen = 0;
+
+      __fsetlocking (fp, FSETLOCKING_BYCALLER);
+
+      while (!feof_unlocked (fp))
+	{
+	  ssize_t n = getline (&line, &linelen, fp);
+	  if (n <= 0)
+	    break;
+
+	  /* Recognize only
+
+	       <THE-VARIABLE> = TRUE
+
+	     with arbitrary white spaces.  */
+	  char *cp = line;
+	  while (isspace (*cp))
+	    ++cp;
+
+	  /* Recognize comment lines.  */
+	  if (*cp == '#')
+	    continue;
+
+	  int idx;
+	  for (idx = 0; idx < nvars; ++idx)
+	    if (strncmp (cp, vars[idx].name, vars[idx].len) == 0)
+	      break;
+	  if (idx == nvars)
+	    continue;
+
+	  cp += vars[idx].len;
+	  while (isspace (*cp))
+	    ++cp;
+	  if (*cp++ != '=')
+	    continue;
+	  while (isspace (*cp))
+	    ++cp;
+
+	  if (strncmp (cp, "TRUE", 4) != 0)
+	    continue;
+	  cp += 4;
+
+	  while (isspace (*cp))
+	    ++cp;
+
+	  if (*cp == '\0')
+	    default_nss_flags |= vars[idx].flag;
+	}
+
+      free (line);
+
+      fclose (fp);
+    }
+  __set_errno (saved_errno);
+}
+
+
+int
+_nsl_default_nss (void)
+{
+  /* If we have not yet read the file yet do it now.  */
+  __libc_once (once, init);
+
+  return default_nss_flags;
+}