1 files changed, 235 insertions, 0 deletions
diff --git a/nss/nss_db/db-alias.c b/nss/nss_db/db-alias.c
new file mode 100644
index 0000000000..2c44f4df79
--- /dev/null
+++ b/nss/nss_db/db-alias.c
@@ -0,0 +1,235 @@
+/* Mail alias file parser in nss_db module.
+   Copyright (C) 1996 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <aliases.h>
+#include <alloca.h>
+#include <ctype.h>
+#include <db.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libc-lock.h>
+#include <paths.h>
+#include <string.h>
+
+#include "nsswitch.h"
+
+/* Locks the static variables in this file.  */
+__libc_lock_define_initialized (static, lock)
+
+/* Maintenance of the shared handle open on the database.  */
+
+static DB *db;
+static int keep_db;
+static unsigned int entidx;	/* Index for `getaliasent_r'. */
+
+/* Open database file if not already opened.  */
+static enum nss_status
+internal_setent (int stayopen)
+{
+  enum nss_status status = NSS_STATUS_SUCCESS;
+
+  if (db == NULL)
+    {
+      db = dbopen (_PATH_VARDB "aliases.db", O_RDONLY, 0, DB_BTREE, NULL);
+
+      if (db == NULL)
+	status = NSS_STATUS_UNAVAIL;
+    }
+
+  /* Remember STAYOPEN flag.  */
+  if (db != NULL)
+    keep_db |= stayopen;
+
+  return status;
+}
+
+
+/* Thread-safe, exported version of that.  */
+enum nss_status
+_nss_db_setaliasent (int stayopen)
+{
+  enum nss_status status;
+
+  __libc_lock_lock (lock);
+
+  status = internal_setent (stayopen);
+
+  /* Reset the sequential index.  */
+  entidx = 0;
+
+  __libc_lock_unlock (lock);
+
+  return status;
+}
+
+
+/* Close the database file.  */
+static void
+internal_endent (void)
+{
+  if (db != NULL)
+    {
+      (*db->close) (db);
+      db = NULL;
+    }
+}
+
+
+/* Thread-safe, exported version of that.  */
+enum nss_status
+_nss_db_endaliasent (void)
+{
+  __libc_lock_lock (lock);
+
+  internal_endent ();
+
+  /* Reset STAYOPEN flag.  */
+  keep_db = 0;
+
+  __libc_lock_unlock (lock);
+
+  return NSS_STATUS_SUCCESS;
+}
+
+/* We provide the parse function here.  The parser in libnss_files
+   cannot be used.  The generation of the db file already resolved all
+   :include: statements so we simply have to parse the list and store
+   the result.  */
+static enum nss_status
+lookup (const DBT *key, struct aliasent *result, char *buffer,
+	    size_t buflen)
+{
+  enum nss_status status;
+  DBT value;
+
+  /* Open the database.  */
+  status = internal_setent (keep_db);
+  if (status != NSS_STATUS_SUCCESS)
+    return status;
+
+  if ((*db->get) (db, key, &value, 0) == 0)
+    {
+      const char *src = value.data;
+
+      result->alias_members_len = 0;
+
+      /* We now have to fill the BUFFER with all the information. */
+      if (buflen < key->size + 1)
+	{
+	no_more_room:
+	  __set_errno (ERANGE);
+	  return NSS_STATUS_TRYAGAIN;
+	}
+
+      if (status == NSS_STATUS_SUCCESS)
+	{
+	  char *cp;
+	  size_t cnt;
+
+	  buffer = stpncpy (buffer, key->data, key->size) + 1;
+	  buflen -= key->size + 1;
+
+	  while (*src != '\0')
+	    {
+	      const char *end, *upto;
+	      while (isspace (*src))
+		++src;
+
+	      end = strchr (src, ',');
+	      if (end == NULL)
+		end = strchr (src, '\0');
+	      for (upto = end; upto > src && isspace (upto[-1]); --upto);
+
+	      if (upto != src)
+		{
+		  if ((upto - src) + __alignof__ (char *) > buflen)
+		    goto no_more_room;
+		  buffer = stpncpy (buffer, src, upto - src) + 1;
+		  buflen -= (upto - src) + __alignof (char *);
+		  ++result->alias_members_len;
+		}
+	      src = end + (*end != '\0');
+	    }
+
+	  /* Now prepare the return.  Provide string pointers for the
+	     currently selected aliases.  */
+
+	  /* Adjust the pointer so it is aligned for storing pointers.  */
+	  buffer += __alignof__ (char *) - 1;
+	  buffer -= ((buffer - (char *) 0) % __alignof__ (char *));
+	  result->alias_members = (char **) buffer;
+
+	  /* Compute addresses of alias entry strings.  */
+	  cp = result->alias_name;
+	  for (cnt = 0; cnt < result->alias_members_len; ++cnt)
+	    {
+	      cp = strchr (cp, '\0') + 1;
+	      result->alias_members[cnt] = cp;
+	    }
+
+	  status = (result->alias_members_len == 0
+		    ? NSS_STATUS_RETURN : NSS_STATUS_SUCCESS);
+	}
+    }
+  else
+    status = NSS_STATUS_NOTFOUND;
+
+  if (! keep_db)
+    internal_endent ();
+
+  return status;
+}
+
+enum nss_status
+_nss_db_getaliasent_r (struct aliasent *result, char *buffer, size_t buflen)
+{
+  /* Return next entry in host file.  */
+  enum nss_status status;
+  char buf[20];
+  DBT key;
+
+  __libc_lock_lock (lock);
+  key.size = 1 + snprintf (key.data = buf, sizeof buf, "0%u", entidx++);
+  status = lookup (&key, result, buffer, buflen);
+  __libc_lock_unlock (lock);
+
+  return status;
+}
+
+
+enum nss_status
+_nss_db_getaliasbyname_r (const char *name, struct aliasent *result,
+			  char *buffer, size_t buflen)
+{
+  DBT key;
+  enum nss_status status;
+
+  key.size = 1 + strlen (name);
+
+  key.data = __alloca (key.size);
+  ((char *) key.data)[0] = '.';
+  memcpy (&((char *) key.data)[1], name, key.size - 1);
+
+  __libc_lock_lock (lock);
+  status = lookup (&key, result, buffer, buflen);
+  __libc_lock_unlock (lock);
+
+  return status;
+}