diff --git a/isisd/modified/log.c b/isisd/modified/log.c
new file mode 100644
index 0000000..385fb38
--- /dev/null
+++ b/isisd/modified/log.c
@@ -0,0 +1,484 @@
+/* Logging of zebra
+ * 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.  
+ */
+
+#include <zebra.h>
+
+#include "log.h"
+#include "memory.h"
+#include "command.h"
+
+struct zlog *zlog_default = NULL;
+
+const char *zlog_proto_names[] = 
+{
+  "NONE",
+  "DEFAULT",
+  "ZEBRA",
+  "RIP",
+  "BGP",
+  "OSPF",
+  "RIPNG",
+  "OSPF6",
+  "ISIS",
+  "MASC",
+  NULL,
+};
+
+const char *zlog_priority[] =
+{
+  "emergencies",
+  "alerts",
+  "critical",
+  "errors",
+  "warnings",
+  "notifications",
+  "informational",
+  "debugging",
+  NULL,
+};
+  
+
+
+/* For time string format. */
+#define TIME_BUF 27
+
+/* Utility routine for current time printing. */
+static void
+time_print (FILE *fp)
+{
+  int ret;
+  char buf [TIME_BUF];
+  time_t clock;
+  struct tm *tm;
+  
+  time (&clock);
+  tm = localtime (&clock);
+
+  ret = strftime (buf, TIME_BUF, "%Y/%m/%d %H:%M:%S", tm);
+  if (ret == 0) {
+    zlog_warn ("strftime error");
+  }
+
+  fprintf (fp, "%s ", buf);
+}
+
+/* va_list version of zlog. */
+void
+vzlog (struct zlog *zl, int priority, const char *format, va_list *args)
+{
+  /* If zlog is not specified, use default one. */
+  if (zl == NULL)
+    zl = zlog_default;
+
+  /* When zlog_default is also NULL, use stderr for logging. */
+  if (zl == NULL)
+    {
+      time_print (stderr);
+      fprintf (stderr, "%s: ", "unknown");
+      vfprintf (stderr, format, args[ZLOG_NOLOG_INDEX]);
+      fprintf (stderr, "\n");
+      fflush (stderr);
+
+      /* In this case we return at here. */
+      return;
+    }
+
+  /* only log this information if it has not been masked out */
+  if ( priority > zl->maskpri )
+    return ;
+		
+  /* Syslog output */
+  if (zl->flags & ZLOG_SYSLOG)
+    vsyslog (priority, format, args[ZLOG_SYSLOG_INDEX]);
+
+  /* File output. */
+  if (zl->flags & ZLOG_FILE)
+    {
+      time_print (zl->fp);
+      if (zl->record_priority) fprintf (zl->fp, "%s: ", zlog_priority[priority]);
+      fprintf (zl->fp, "%s: ", zlog_proto_names[zl->protocol]);
+      vfprintf (zl->fp, format, args[ZLOG_FILE_INDEX]);
+      fprintf (zl->fp, "\n");
+      fflush (zl->fp);
+    }
+
+  /* stdout output. */
+  if (zl->flags & ZLOG_STDOUT)
+    {
+      time_print (stdout);
+      if (zl->record_priority) fprintf (stdout, "%s: ", zlog_priority[priority]);
+      fprintf (stdout, "%s: ", zlog_proto_names[zl->protocol]);
+      vfprintf (stdout, format, args[ZLOG_STDOUT_INDEX]);
+      fprintf (stdout, "\n");
+      fflush (stdout);
+    }
+
+  /* stderr output. */
+  if (zl->flags & ZLOG_STDERR)
+    {
+      time_print (stderr);
+      if (zl->record_priority) fprintf (stderr, "%s: ", zlog_priority[priority]);
+      fprintf (stderr, "%s: ", zlog_proto_names[zl->protocol]);
+      vfprintf (stderr, format, args[ZLOG_STDERR_INDEX]);
+      fprintf (stderr, "\n");
+      fflush (stderr);
+    }
+
+  /* Terminal monitor. */
+  vty_log (zlog_proto_names[zl->protocol], format, args[ZLOG_NOLOG_INDEX]);
+}
+
+void
+zlog (struct zlog *zl, int priority, const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (zl, priority, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+zlog_err (const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (NULL, LOG_ERR, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+zlog_warn (const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (NULL, LOG_WARNING, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+zlog_info (const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (NULL, LOG_INFO, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+zlog_notice (const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (NULL, LOG_NOTICE, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+zlog_debug (const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (NULL, LOG_DEBUG, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+plog_err (struct zlog *zl, const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (zl, LOG_ERR, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+plog_warn (struct zlog *zl, const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (zl, LOG_WARNING, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+plog_info (struct zlog *zl, const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (zl, LOG_INFO, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+plog_notice (struct zlog *zl, const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (zl, LOG_NOTICE, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+void
+plog_debug (struct zlog *zl, const char *format, ...)
+{
+  va_list args[ZLOG_MAX_INDEX];
+  int index;
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_start(args[index], format);
+
+  vzlog (zl, LOG_DEBUG, format, args);
+
+  for (index = 0; index < ZLOG_MAX_INDEX; index++)
+    va_end (args[index]);
+}
+
+
+/* Open log stream */
+struct zlog *
+openzlog (const char *progname, int flags, zlog_proto_t protocol,
+	  int syslog_flags, int syslog_facility)
+{
+  struct zlog *zl;
+
+  zl = XMALLOC(MTYPE_ZLOG, sizeof (struct zlog));
+  memset (zl, 0, sizeof (struct zlog));
+
+  zl->ident = progname;
+  zl->flags = flags;
+  zl->protocol = protocol;
+  zl->facility = syslog_facility;
+  zl->maskpri = LOG_DEBUG;
+  zl->record_priority = 0;
+
+  openlog (progname, syslog_flags, zl->facility);
+  
+  return zl;
+}
+
+void
+closezlog (struct zlog *zl)
+{
+  closelog();
+  fclose (zl->fp);
+
+  XFREE (MTYPE_ZLOG, zl);
+}
+
+/* Called from command.c. */
+void
+zlog_set_flag (struct zlog *zl, int flags)
+{
+  if (zl == NULL)
+    zl = zlog_default;
+
+  zl->flags |= flags;
+}
+
+void
+zlog_reset_flag (struct zlog *zl, int flags)
+{
+  if (zl == NULL)
+    zl = zlog_default;
+
+  zl->flags &= ~flags;
+}
+
+int
+zlog_set_file (struct zlog *zl, int flags, char *filename)
+{
+  FILE *fp;
+
+  /* There is opend file.  */
+  zlog_reset_file (zl);
+
+  /* Set default zl. */
+  if (zl == NULL)
+    zl = zlog_default;
+
+  /* Open file. */
+  fp = fopen (filename, "a");
+  if (fp == NULL)
+    return 0;
+
+  /* Set flags. */
+  zl->filename = strdup (filename);
+  zl->flags |= ZLOG_FILE;
+  zl->fp = fp;
+
+  return 1;
+}
+
+/* Reset opend file. */
+int
+zlog_reset_file (struct zlog *zl)
+{
+  if (zl == NULL)
+    zl = zlog_default;
+
+  zl->flags &= ~ZLOG_FILE;
+
+  if (zl->fp)
+    fclose (zl->fp);
+  zl->fp = NULL;
+
+  if (zl->filename)
+    free (zl->filename);
+  zl->filename = NULL;
+
+  return 1;
+}
+
+/* Reopen log file. */
+int
+zlog_rotate (struct zlog *zl)
+{
+  FILE *fp;
+
+  if (zl == NULL)
+    zl = zlog_default;
+
+  if (zl->fp)
+    fclose (zl->fp);
+  zl->fp = NULL;
+
+  if (zl->filename)
+    {
+      fp = fopen (zl->filename, "a");
+      if (fp == NULL)
+	return -1;
+      zl->fp = fp;
+    }
+
+  return 1;
+}
+
+static char *zlog_cwd = NULL;
+
+void
+zlog_save_cwd ()
+{
+  char *cwd;
+
+  cwd = getcwd (NULL, MAXPATHLEN);
+
+  zlog_cwd = XMALLOC (MTYPE_TMP, strlen (cwd) + 1);
+  strcpy (zlog_cwd, cwd);
+}
+
+char *
+zlog_get_cwd ()
+{
+  return zlog_cwd;
+}
+
+void
+zlog_free_cwd ()
+{
+  if (zlog_cwd)
+    XFREE (MTYPE_TMP, zlog_cwd);
+}
+
+/* Message lookup function. */
+char *
+lookup (struct message *mes, int key)
+{
+  struct message *pnt;
+
+  for (pnt = mes; pnt->key != 0; pnt++) 
+    if (pnt->key == key) 
+      return pnt->str;
+
+  return "";
+}
+
+/* Very old hacky version of message lookup function.  Still partly
+   used in bgpd and ospfd. */
+char *
+mes_lookup (struct message *meslist, int max, int index)
+{
+  if (index < 0 || index >= max) 
+    {
+      zlog_err ("message index out of bound: %d", max);
+      return NULL;
+    }
+  return meslist[index].str;
+}