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diff --git a/ntp_core.h b/ntp_core.h
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+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2002
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ * 
+ * This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ * 
+ **********************************************************************
+
+  =======================================================================
+
+  Header file for the main NTP protocol engine
+  */
+
+#ifndef GOT_NTP_CORE_H
+#define GOT_NTP_CORE_H
+
+#include "sysincl.h"
+
+#include "addressing.h"
+#include "srcparams.h"
+#include "ntp.h"
+#include "reports.h"
+
+typedef enum {
+  NTP_SERVER, NTP_PEER
+} NTP_Source_Type;
+
+typedef enum {
+  NTP_TS_DAEMON = 0,
+  NTP_TS_KERNEL,
+  NTP_TS_HARDWARE
+} NTP_Timestamp_Source;
+
+typedef struct {
+  struct timespec ts;
+  double err;
+  NTP_Timestamp_Source source;
+} NTP_Local_Timestamp;
+
+/* This is a private data type used for storing the instance record for
+   each source that we are chiming with */
+typedef struct NCR_Instance_Record *NCR_Instance;
+
+/* Init and fini functions */
+extern void NCR_Initialise(void);
+extern void NCR_Finalise(void);
+
+/* Get a new instance for a server or peer */
+extern NCR_Instance NCR_GetInstance(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params);
+
+/* Destroy an instance */
+extern void NCR_DestroyInstance(NCR_Instance instance);
+
+/* Start an instance */
+extern void NCR_StartInstance(NCR_Instance instance);
+
+/* Reset an instance */
+extern void NCR_ResetInstance(NCR_Instance inst);
+
+/* Reset polling interval of an instance */
+extern void NCR_ResetPoll(NCR_Instance instance);
+
+/* Change the remote address of an instance */
+extern void NCR_ChangeRemoteAddress(NCR_Instance inst, NTP_Remote_Address *remote_addr);
+
+/* This routine is called when a new packet arrives off the network,
+   and it relates to a source we have an ongoing protocol exchange with */
+extern int NCR_ProcessRxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
+                              NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length);
+
+/* This routine is called when a new packet arrives off the network,
+   and we do not recognize its source */
+extern void NCR_ProcessRxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                                 NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length);
+
+/* This routine is called when a packet is sent to a source we have
+   an ongoing protocol exchange with */
+extern void NCR_ProcessTxKnown(NCR_Instance inst, NTP_Local_Address *local_addr,
+                               NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length);
+
+/* This routine is called when a packet is sent to a destination we
+   do not recognize */
+extern void NCR_ProcessTxUnknown(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                                 NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length);
+
+/* Slew receive and transmit times in instance records */
+extern void NCR_SlewTimes(NCR_Instance inst, struct timespec *when, double dfreq, double doffset);
+
+/* Take a particular source online (i.e. start sampling it) or offline
+   (i.e. stop sampling it) */
+extern void NCR_SetConnectivity(NCR_Instance inst, SRC_Connectivity connectivity);
+
+extern void NCR_ModifyMinpoll(NCR_Instance inst, int new_minpoll);
+
+extern void NCR_ModifyMaxpoll(NCR_Instance inst, int new_maxpoll);
+
+extern void NCR_ModifyMaxdelay(NCR_Instance inst, double new_max_delay);
+
+extern void NCR_ModifyMaxdelayratio(NCR_Instance inst, double new_max_delay_ratio);
+
+extern void NCR_ModifyMaxdelaydevratio(NCR_Instance inst, double new_max_delay_dev_ratio);
+
+extern void NCR_ModifyMinstratum(NCR_Instance inst, int new_min_stratum);
+
+extern void NCR_ModifyPolltarget(NCR_Instance inst, int new_poll_target);
+
+extern void NCR_InitiateSampleBurst(NCR_Instance inst, int n_good_samples, int n_total_samples);
+
+extern void NCR_ReportSource(NCR_Instance inst, RPT_SourceReport *report, struct timespec *now);
+extern void NCR_GetNTPReport(NCR_Instance inst, RPT_NTPReport *report);
+
+extern int NCR_AddAccessRestriction(IPAddr *ip_addr, int subnet_bits, int allow, int all);
+extern int NCR_CheckAccessRestriction(IPAddr *ip_addr);
+
+extern void NCR_IncrementActivityCounters(NCR_Instance inst, int *online, int *offline, 
+                                          int *burst_online, int *burst_offline);
+
+extern NTP_Remote_Address *NCR_GetRemoteAddress(NCR_Instance instance);
+
+extern uint32_t NCR_GetLocalRefid(NCR_Instance inst);
+
+extern int NCR_IsSyncPeer(NCR_Instance instance);
+
+extern void NCR_AddBroadcastDestination(IPAddr *addr, unsigned short port, int interval);
+
+#endif /* GOT_NTP_CORE_H */