diff --git a/isisd/modified/log.h b/isisd/modified/log.h
new file mode 100644
index 0000000..8948ea0
--- /dev/null
+++ b/isisd/modified/log.h
@@ -0,0 +1,129 @@
+/* Zebra logging funcions.
+ * Copyright (C) 1997, 1998, 1999 Kunihiro Ishiguro
+ *
+ * This file is part of GNU Zebra.
+ *
+ * GNU Zebra is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * GNU Zebra 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Zebra; see the file COPYING.  If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.  
+ */
+
+#ifndef _ZEBRA_LOG_H
+#define _ZEBRA_LOG_H
+
+#include <syslog.h>
+
+#define ZLOG_NOLOG              0x00
+#define ZLOG_FILE		0x01
+#define ZLOG_SYSLOG		0x02
+#define ZLOG_STDOUT             0x04
+#define ZLOG_STDERR             0x08
+
+#define ZLOG_NOLOG_INDEX        0
+#define ZLOG_FILE_INDEX         1
+#define ZLOG_SYSLOG_INDEX       2
+#define ZLOG_STDOUT_INDEX       3
+#define ZLOG_STDERR_INDEX       4
+#define ZLOG_MAX_INDEX          5
+
+typedef enum 
+{
+  ZLOG_NONE,
+  ZLOG_DEFAULT,
+  ZLOG_ZEBRA,
+  ZLOG_RIP,
+  ZLOG_BGP,
+  ZLOG_OSPF,
+  ZLOG_RIPNG,  
+  ZLOG_OSPF6,
+  ZLOG_ISIS,
+  ZLOG_MASC
+} zlog_proto_t;
+
+struct zlog 
+{
+  const char *ident;
+  zlog_proto_t protocol;
+  int flags;
+  FILE *fp;
+  char *filename;
+  int syslog;
+  int stat;
+  int connected;
+  int maskpri;		/* as per syslog setlogmask */
+  int priority;		/* as per syslog priority */
+  int facility;		/* as per syslog facility */
+  int record_priority;
+};
+
+/* Message structure. */
+struct message
+{
+  int key;
+  char *str;
+};
+
+/* Default logging strucutre. */
+extern struct zlog *zlog_default;
+
+/* Open zlog function */
+struct zlog *openzlog (const char *, int, zlog_proto_t, int, int);
+
+/* Close zlog function. */
+void closezlog (struct zlog *zl);
+
+/* GCC have printf type attribute check.  */
+#ifdef __GNUC__
+#define PRINTF_ATTRIBUTE(a,b) __attribute__ ((__format__ (__printf__, a, b)))
+#else
+#define PRINTF_ATTRIBUTE(a,b)
+#endif /* __GNUC__ */
+
+/* Generic function for zlog. */
+void zlog (struct zlog *zl, int priority, const char *format, ...) PRINTF_ATTRIBUTE(3, 4);
+
+/* Handy zlog functions. */
+void zlog_err (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
+void zlog_warn (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
+void zlog_info (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
+void zlog_notice (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
+void zlog_debug (const char *format, ...) PRINTF_ATTRIBUTE(1, 2);
+
+/* For bgpd's peer oriented log. */
+void plog_err (struct zlog *, const char *format, ...);
+void plog_warn (struct zlog *, const char *format, ...);
+void plog_info (struct zlog *, const char *format, ...);
+void plog_notice (struct zlog *, const char *format, ...);
+void plog_debug (struct zlog *, const char *format, ...);
+
+/* Set zlog flags. */
+void zlog_set_flag (struct zlog *zl, int flags);
+void zlog_reset_flag (struct zlog *zl, int flags);
+
+/* Set zlog filename. */
+int zlog_set_file (struct zlog *zl, int flags, char *filename);
+int zlog_reset_file (struct zlog *zl);
+
+/* Rotate log. */
+int zlog_rotate ();
+
+/* For hackey massage lookup and check */
+#define LOOKUP(x, y) mes_lookup(x, x ## _max, y)
+
+char *lookup (struct message *, int);
+char *mes_lookup (struct message *meslist, int max, int index);
+
+extern const char *zlog_priority[];
+
+#endif /* _ZEBRA_LOG_H */