diff --git a/ospfd/ospf_api.c b/ospfd/ospf_api.c
new file mode 100644
index 0000000..cd69336
--- /dev/null
+++ b/ospfd/ospf_api.c
@@ -0,0 +1,647 @@
+/*
+ * API message handling module for OSPF daemon and client.
+ * Copyright (C) 2001, 2002 Ralph Keller
+ *
+ * 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>
+
+#ifdef SUPPORT_OSPF_API
+#ifndef HAVE_OPAQUE_LSA
+#error "Core Opaque-LSA module must be configured."
+#endif /* HAVE_OPAQUE_LSA */
+
+#include "linklist.h"
+#include "prefix.h"
+#include "if.h"
+#include "table.h"
+#include "memory.h"
+#include "command.h"
+#include "vty.h"
+#include "stream.h"
+#include "log.h"
+#include "thread.h"
+#include "hash.h"
+#include "sockunion.h"		/* for inet_aton() */
+#include "buffer.h"
+#include "network.h"
+
+#include "ospfd/ospfd.h"
+#include "ospfd/ospf_interface.h"
+#include "ospfd/ospf_ism.h"
+#include "ospfd/ospf_asbr.h"
+#include "ospfd/ospf_lsa.h"
+#include "ospfd/ospf_lsdb.h"
+#include "ospfd/ospf_neighbor.h"
+#include "ospfd/ospf_nsm.h"
+#include "ospfd/ospf_flood.h"
+#include "ospfd/ospf_packet.h"
+#include "ospfd/ospf_spf.h"
+#include "ospfd/ospf_dump.h"
+#include "ospfd/ospf_route.h"
+#include "ospfd/ospf_ase.h"
+#include "ospfd/ospf_zebra.h"
+
+#include "ospfd/ospf_api.h"
+
+
+/* For debugging only, will be removed */
+void
+api_opaque_lsa_print (struct lsa_header *data)
+{
+  struct opaque_lsa
+  {
+    struct lsa_header header;
+    u_char mydata[0];
+  };
+
+  struct opaque_lsa *olsa;
+  int opaquelen;
+  int i;
+
+  ospf_lsa_header_dump (data);
+
+  olsa = (struct opaque_lsa *) data;
+
+  opaquelen = ntohs (data->length) - OSPF_LSA_HEADER_SIZE;
+  zlog_warn ("apiserver_lsa_print: opaquelen=%d\n", opaquelen);
+
+  for (i = 0; i < opaquelen; i++)
+    {
+      zlog_warn ("0x%x ", olsa->mydata[i]);
+    }
+  zlog_warn ("\n");
+}
+
+/* -----------------------------------------------------------
+ * Generic messages
+ * -----------------------------------------------------------
+ */
+
+struct msg *
+msg_new (u_char msgtype, void *msgbody, u_int32_t seqnum, u_int16_t msglen)
+{
+  struct msg *new;
+
+  new = XMALLOC (MTYPE_OSPF_API_MSG, sizeof (struct msg));
+  memset (new, 0, sizeof (struct msg));
+
+  new->hdr.version = OSPF_API_VERSION;
+  new->hdr.msgtype = msgtype;
+  new->hdr.msglen = htons (msglen);
+  new->hdr.msgseq = htonl (seqnum);
+
+  new->s = stream_new (msglen);
+  assert (new->s);
+  stream_put (new->s, msgbody, msglen);
+
+  return new;
+}
+
+
+/* Duplicate a message by copying content. */
+struct msg *
+msg_dup (struct msg *msg)
+{
+  struct msg *new;
+
+  assert (msg);
+
+  new = msg_new (msg->hdr.msgtype, STREAM_DATA (msg->s),
+		 ntohl (msg->hdr.msgseq), ntohs (msg->hdr.msglen));
+  return new;
+}
+
+
+/* XXX only for testing, will be removed */
+
+struct nametab {
+  int value;
+  const char *name;
+};
+
+const char *
+ospf_api_typename (int msgtype)
+{
+  struct nametab NameTab[] = {
+    { MSG_REGISTER_OPAQUETYPE,   "Register opaque-type",   },
+    { MSG_UNREGISTER_OPAQUETYPE, "Unregister opaque-type", },
+    { MSG_REGISTER_EVENT,        "Register event",         },
+    { MSG_SYNC_LSDB,             "Sync LSDB",              },
+    { MSG_ORIGINATE_REQUEST,     "Originate request",      },
+    { MSG_DELETE_REQUEST,        "Delete request",         },
+    { MSG_REPLY,                 "Reply",                  },
+    { MSG_READY_NOTIFY,          "Ready notify",           },
+    { MSG_LSA_UPDATE_NOTIFY,     "LSA update notify",      },
+    { MSG_LSA_DELETE_NOTIFY,     "LSA delete notify",      },
+    { MSG_NEW_IF,                "New interface",          },
+    { MSG_DEL_IF,                "Del interface",          },
+    { MSG_ISM_CHANGE,            "ISM change",             },
+    { MSG_NSM_CHANGE,            "NSM change",             },
+  };
+
+  int i, n = sizeof (NameTab) / sizeof (NameTab[0]);
+  const char *name = NULL;
+
+  for (i = 0; i < n; i++)
+    {
+      if (NameTab[i].value == msgtype)
+        {
+          name = NameTab[i].name;
+          break;
+        }
+    }
+
+  return name ? name : "?";
+}
+
+const char *
+ospf_api_errname (int errcode)
+{
+  struct nametab NameTab[] = {
+    { OSPF_API_OK,                      "OK",                         },
+    { OSPF_API_NOSUCHINTERFACE,         "No such interface",          },
+    { OSPF_API_NOSUCHAREA,              "No such area",               },
+    { OSPF_API_NOSUCHLSA,               "No such LSA",                },
+    { OSPF_API_ILLEGALLSATYPE,          "Illegal LSA type",           },
+    { OSPF_API_OPAQUETYPEINUSE,         "Opaque type in use",         },
+    { OSPF_API_OPAQUETYPENOTREGISTERED, "Opaque type not registered", },
+    { OSPF_API_NOTREADY,                "Not ready",                  },
+    { OSPF_API_NOMEMORY,                "No memory",                  },
+    { OSPF_API_ERROR,                   "Other error",                },
+    { OSPF_API_UNDEF,                   "Undefined",                  },
+  };
+
+  int i, n = sizeof (NameTab) / sizeof (NameTab[0]);
+  const char *name = NULL;
+
+  for (i = 0; i < n; i++)
+    {
+      if (NameTab[i].value == errcode)
+        {
+          name = NameTab[i].name;
+          break;
+        }
+    }
+
+  return name ? name : "?";
+}
+
+void
+msg_print (struct msg *msg)
+{
+  if (!msg)
+    {
+      zlog_warn ("msg_print msg=NULL!\n");
+      return;
+    }
+
+#ifdef ORIGINAL_CODING
+  zlog_warn
+    ("msg=%p msgtype=%d msglen=%d msgseq=%d streamdata=%p streamsize=%lu\n",
+     msg, msg->hdr.msgtype, ntohs (msg->hdr.msglen), ntohl (msg->hdr.msgseq),
+     STREAM_DATA (msg->s), STREAM_SIZE (msg->s));
+#else /* ORIGINAL_CODING */
+  /* API message common header part. */
+  zlog_info
+    ("API-msg [%s]: type(%d),len(%d),seq(%lu),data(%p),size(%lu)",
+     ospf_api_typename (msg->hdr.msgtype), msg->hdr.msgtype, 
+     ntohs (msg->hdr.msglen), (unsigned long) ntohl (msg->hdr.msgseq),
+     STREAM_DATA (msg->s), STREAM_SIZE (msg->s));
+
+  /* API message body part. */
+#ifdef ndef
+  /* Generic Hex/Ascii dump */
+  DumpBuf (STREAM_DATA (msg->s), STREAM_SIZE (msg->s)); /* Sorry, deleted! */
+#else /* ndef */
+  /* Message-type dependent dump function. */
+#endif /* ndef */
+
+  return;
+#endif /* ORIGINAL_CODING */
+}
+
+void
+msg_free (struct msg *msg)
+{
+  if (msg->s)
+    stream_free (msg->s);
+
+  XFREE (MTYPE_OSPF_API_MSG, msg);
+}
+
+
+/* Set sequence number of message */
+void
+msg_set_seq (struct msg *msg, u_int32_t seqnr)
+{
+  assert (msg);
+  msg->hdr.msgseq = htonl (seqnr);
+}
+
+/* Get sequence number of message */
+u_int32_t
+msg_get_seq (struct msg *msg)
+{
+  assert (msg);
+  return ntohl (msg->hdr.msgseq);
+}
+
+/* -----------------------------------------------------------
+ * Message fifo queues
+ * -----------------------------------------------------------
+ */
+
+struct msg_fifo *
+msg_fifo_new ()
+{
+  struct msg_fifo *new;
+
+  new = XMALLOC (MTYPE_OSPF_API_FIFO, sizeof (struct msg_fifo));
+  memset (new, 0, sizeof (struct msg_fifo));
+
+  return new;
+}
+
+/* Add new message to fifo. */
+void
+msg_fifo_push (struct msg_fifo *fifo, struct msg *msg)
+{
+  if (fifo->tail)
+    fifo->tail->next = msg;
+  else
+    fifo->head = msg;
+
+  fifo->tail = msg;
+  fifo->count++;
+}
+
+
+/* Remove first message from fifo. */
+struct msg *
+msg_fifo_pop (struct msg_fifo *fifo)
+{
+  struct msg *msg;
+
+  msg = fifo->head;
+  if (msg)
+    {
+      fifo->head = msg->next;
+
+      if (fifo->head == NULL)
+	fifo->tail = NULL;
+
+      fifo->count--;
+    }
+  return msg;
+}
+
+/* Return first fifo entry but do not remove it. */
+struct msg *
+msg_fifo_head (struct msg_fifo *fifo)
+{
+  return fifo->head;
+}
+
+/* Flush message fifo. */
+void
+msg_fifo_flush (struct msg_fifo *fifo)
+{
+  struct msg *op;
+  struct msg *next;
+
+  for (op = fifo->head; op; op = next)
+    {
+      next = op->next;
+      msg_free (op);
+    }
+
+  fifo->head = fifo->tail = NULL;
+  fifo->count = 0;
+}
+
+/* Free API message fifo. */
+void
+msg_fifo_free (struct msg_fifo *fifo)
+{
+  msg_fifo_flush (fifo);
+
+  XFREE (MTYPE_OSPF_API_FIFO, fifo);
+}
+
+struct msg *
+msg_read (int fd)
+{
+  struct msg *msg;
+  struct apimsghdr hdr;
+  char buf[OSPF_API_MAX_MSG_SIZE];
+  int bodylen;
+  int rlen;
+
+  /* Read message header */
+  rlen = readn (fd, (char *) &hdr, sizeof (struct apimsghdr));
+
+  if (rlen < 0)
+    {
+      zlog_warn ("msg_read: readn %s", strerror (errno));
+      return NULL;
+    }
+  else if (rlen == 0)
+    {
+      zlog_warn ("msg_read: Connection closed by peer");
+      return NULL;
+    }
+  else if (rlen != sizeof (struct apimsghdr))
+    {
+      zlog_warn ("msg_read: Cannot read message header!");
+      return NULL;
+    }
+
+  /* Check version of API protocol */
+  if (hdr.version != OSPF_API_VERSION)
+    {
+      zlog_warn ("msg_read: OSPF API protocol version mismatch");
+      return NULL;
+    }
+
+  /* Determine body length. */
+  bodylen = ntohs (hdr.msglen);
+  if (bodylen > 0)
+    {
+
+      /* Read message body */
+      rlen = readn (fd, buf, bodylen);
+      if (rlen < 0)
+	{
+	  zlog_warn ("msg_read: readn %s", strerror (errno));
+	  return NULL;
+	}
+      else if (rlen == 0)
+	{
+	  zlog_warn ("msg_read: Connection closed by peer");
+	  return NULL;
+	}
+      else if (rlen != bodylen)
+	{
+	  zlog_warn ("msg_read: Cannot read message body!");
+	  return NULL;
+	}
+    }
+
+  /* Allocate new message */
+  msg = msg_new (hdr.msgtype, buf, ntohl (hdr.msgseq), ntohs (hdr.msglen));
+
+  return msg;
+}
+
+int
+msg_write (int fd, struct msg *msg)
+{
+  u_char buf[OSPF_API_MAX_MSG_SIZE];
+  int l;
+  int wlen;
+
+  assert (msg);
+  assert (msg->s);
+
+  /* Length of message including header */
+  l = sizeof (struct apimsghdr) + ntohs (msg->hdr.msglen);
+
+  /* Make contiguous memory buffer for message */
+  memcpy (buf, &msg->hdr, sizeof (struct apimsghdr));
+  memcpy (buf + sizeof (struct apimsghdr), STREAM_DATA (msg->s),
+	  ntohs (msg->hdr.msglen));
+
+  wlen = writen (fd, buf, l);
+  if (wlen < 0)
+    {
+      zlog_warn ("msg_write: writen %s", strerror (errno));
+      return -1;
+    }
+  else if (wlen == 0)
+    {
+      zlog_warn ("msg_write: Connection closed by peer");
+      return -1;
+    }
+  else if (wlen != l)
+    {
+      zlog_warn ("msg_write: Cannot write API message");
+      return -1;
+    }
+  return 0;
+}
+
+/* -----------------------------------------------------------
+ * Specific messages
+ * -----------------------------------------------------------
+ */
+
+struct msg *
+new_msg_register_opaque_type (u_int32_t seqnum, u_char ltype, u_char otype)
+{
+  struct msg_register_opaque_type rmsg;
+
+  rmsg.lsatype = ltype;
+  rmsg.opaquetype = otype;
+  memset (&rmsg.pad, 0, sizeof (rmsg.pad));
+
+  return msg_new (MSG_REGISTER_OPAQUETYPE, &rmsg, seqnum,
+		  sizeof (struct msg_register_opaque_type));
+}
+
+struct msg *
+new_msg_register_event (u_int32_t seqnum, struct lsa_filter_type *filter)
+{
+  u_char buf[OSPF_API_MAX_MSG_SIZE];
+  struct msg_register_event *emsg;
+  int len;
+
+  emsg = (struct msg_register_event *) buf;
+  len = sizeof (struct msg_register_event) +
+    filter->num_areas * sizeof (struct in_addr);
+  emsg->filter.typemask = htons (filter->typemask);
+  emsg->filter.origin = filter->origin;
+  emsg->filter.num_areas = filter->num_areas;
+  return msg_new (MSG_REGISTER_EVENT, emsg, seqnum, len);
+}
+
+struct msg *
+new_msg_sync_lsdb (u_int32_t seqnum, struct lsa_filter_type *filter)
+{
+  u_char buf[OSPF_API_MAX_MSG_SIZE];
+  struct msg_sync_lsdb *smsg;
+  int len;
+
+  smsg = (struct msg_sync_lsdb *) buf;
+  len = sizeof (struct msg_sync_lsdb) +
+    filter->num_areas * sizeof (struct in_addr);
+  smsg->filter.typemask = htons (filter->typemask);
+  smsg->filter.origin = filter->origin;
+  smsg->filter.num_areas = filter->num_areas;
+  return msg_new (MSG_SYNC_LSDB, smsg, seqnum, len);
+}
+
+
+struct msg *
+new_msg_originate_request (u_int32_t seqnum,
+			   struct in_addr ifaddr,
+			   struct in_addr area_id, struct lsa_header *data)
+{
+  struct msg_originate_request *omsg;
+  int omsglen;
+  char buf[OSPF_API_MAX_MSG_SIZE];
+
+  omsglen = sizeof (struct msg_originate_request) - sizeof (struct lsa_header)
+    + ntohs (data->length);
+
+  omsg = (struct msg_originate_request *) buf;
+  omsg->ifaddr = ifaddr;
+  omsg->area_id = area_id;
+  memcpy (&omsg->data, data, ntohs (data->length));
+
+  return msg_new (MSG_ORIGINATE_REQUEST, omsg, seqnum, omsglen);
+}
+
+struct msg *
+new_msg_delete_request (u_int32_t seqnum,
+			struct in_addr area_id, u_char lsa_type,
+			u_char opaque_type, u_int32_t opaque_id)
+{
+  struct msg_delete_request dmsg;
+  dmsg.area_id = area_id;
+  dmsg.lsa_type = lsa_type;
+  dmsg.opaque_type = opaque_type;
+  dmsg.opaque_id = htonl (opaque_id);
+  memset (&dmsg.pad, 0, sizeof (dmsg.pad));
+
+  return msg_new (MSG_DELETE_REQUEST, &dmsg, seqnum,
+		  sizeof (struct msg_delete_request));
+}
+
+
+struct msg *
+new_msg_reply (u_int32_t seqnr, u_char rc)
+{
+  struct msg *msg;
+  struct msg_reply rmsg;
+
+  /* Set return code */
+  rmsg.errcode = rc;
+  memset (&rmsg.pad, 0, sizeof (rmsg.pad));
+
+  msg = msg_new (MSG_REPLY, &rmsg, seqnr, sizeof (struct msg_reply));
+
+  return msg;
+}
+
+struct msg *
+new_msg_ready_notify (u_int32_t seqnr, u_char lsa_type,
+		      u_char opaque_type, struct in_addr addr)
+{
+  struct msg_ready_notify rmsg;
+
+  rmsg.lsa_type = lsa_type;
+  rmsg.opaque_type = opaque_type;
+  memset (&rmsg.pad, 0, sizeof (rmsg.pad));
+  rmsg.addr = addr;
+
+  return msg_new (MSG_READY_NOTIFY, &rmsg, seqnr,
+		  sizeof (struct msg_ready_notify));
+}
+
+struct msg *
+new_msg_new_if (u_int32_t seqnr,
+		struct in_addr ifaddr, struct in_addr area_id)
+{
+  struct msg_new_if nmsg;
+
+  nmsg.ifaddr = ifaddr;
+  nmsg.area_id = area_id;
+
+  return msg_new (MSG_NEW_IF, &nmsg, seqnr, sizeof (struct msg_new_if));
+}
+
+struct msg *
+new_msg_del_if (u_int32_t seqnr, struct in_addr ifaddr)
+{
+  struct msg_del_if dmsg;
+
+  dmsg.ifaddr = ifaddr;
+
+  return msg_new (MSG_DEL_IF, &dmsg, seqnr, sizeof (struct msg_del_if));
+}
+
+struct msg *
+new_msg_ism_change (u_int32_t seqnr, struct in_addr ifaddr,
+		    struct in_addr area_id, u_char status)
+{
+  struct msg_ism_change imsg;
+
+  imsg.ifaddr = ifaddr;
+  imsg.area_id = area_id;
+  imsg.status = status;
+  memset (&imsg.pad, 0, sizeof (imsg.pad));
+
+  return msg_new (MSG_ISM_CHANGE, &imsg, seqnr,
+		  sizeof (struct msg_ism_change));
+}
+
+struct msg *
+new_msg_nsm_change (u_int32_t seqnr, struct in_addr ifaddr,
+		    struct in_addr nbraddr,
+		    struct in_addr router_id, u_char status)
+{
+  struct msg_nsm_change nmsg;
+
+  nmsg.ifaddr = ifaddr;
+  nmsg.nbraddr = nbraddr;
+  nmsg.router_id = router_id;
+  nmsg.status = status;
+  memset (&nmsg.pad, 0, sizeof (nmsg.pad));
+
+  return msg_new (MSG_NSM_CHANGE, &nmsg, seqnr,
+		  sizeof (struct msg_nsm_change));
+}
+
+struct msg *
+new_msg_lsa_change_notify (u_char msgtype,
+			   u_int32_t seqnum,
+			   struct in_addr ifaddr,
+			   struct in_addr area_id,
+			   u_char is_self_originated, struct lsa_header *data)
+{
+  u_char buf[OSPF_API_MAX_MSG_SIZE];
+  struct msg_lsa_change_notify *nmsg;
+  int len;
+
+  assert (data);
+
+  nmsg = (struct msg_lsa_change_notify *) buf;
+  len = ntohs (data->length) + sizeof (struct msg_lsa_change_notify)
+    - sizeof (struct lsa_header);
+  nmsg->ifaddr = ifaddr;
+  nmsg->area_id = area_id;
+  nmsg->is_self_originated = is_self_originated;
+  memset (&nmsg->pad, 0, sizeof (nmsg->pad));
+  memcpy (&nmsg->data, data, ntohs (data->length));
+
+  return msg_new (msgtype, nmsg, seqnum, len);
+}
+
+#endif /* SUPPORT_OSPF_API */