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diff --git a/ntp_sources.h b/ntp_sources.h
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+/*
+  chronyd/chronyc - Programs for keeping computer clocks accurate.
+
+ **********************************************************************
+ * Copyright (C) Richard P. Curnow  1997-2002
+ * Copyright (C) Miroslav Lichvar  2014
+ * 
+ * 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 for the part of the software that deals with the set of
+  current NTP servers and peers, which can resolve an IP address into
+  a source record for further processing.
+
+  */
+
+#ifndef GOT_NTP_SOURCES_H
+#define GOT_NTP_SOURCES_H
+
+#include "ntp.h"
+#include "addressing.h"
+#include "srcparams.h"
+#include "ntp_core.h"
+#include "reports.h"
+
+/* Status values returned by operations that indirectly result from user
+   input. */
+typedef enum {
+  NSR_Success, /* Operation successful */
+  NSR_NoSuchSource, /* Remove - attempt to remove a source that is not known */
+  NSR_AlreadyInUse, /* AddSource - attempt to add a source that is already known */ 
+  NSR_TooManySources, /* AddSource - too many sources already present */
+  NSR_InvalidAF /* AddSource - attempt to add a source with invalid address family */
+} NSR_Status;
+
+/* Procedure to add a new server or peer source. */
+extern NSR_Status NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type, SourceParameters *params);
+
+/* Procedure to add a new server, peer source, or pool of servers specified by
+   name instead of address.  The name is resolved in exponentially increasing
+   intervals until it succeeds or fails with a non-temporary error. */
+extern void NSR_AddSourceByName(char *name, int port, int pool, NTP_Source_Type type, SourceParameters *params);
+
+/* Function type for handlers to be called back when an attempt
+ * (possibly unsuccessful) to resolve unresolved sources ends */
+typedef void (*NSR_SourceResolvingEndHandler)(void);
+
+/* Set the handler, or NULL to disable the notification */
+extern void NSR_SetSourceResolvingEndHandler(NSR_SourceResolvingEndHandler handler);
+
+/* Procedure to start resolving unresolved sources */
+extern void NSR_ResolveSources(void);
+
+/* Procedure to start all sources */
+extern void NSR_StartSources(void);
+
+/* Start new sources automatically */
+extern void NSR_AutoStartSources(void);
+
+/* Procedure to remove a source */
+extern NSR_Status NSR_RemoveSource(NTP_Remote_Address *remote_addr);
+
+/* Procedure to remove all sources */
+extern void NSR_RemoveAllSources(void);
+
+/* Procedure to try to find a replacement for a bad source */
+extern void NSR_HandleBadSource(IPAddr *address);
+
+/* Procedure to resolve all names again */
+extern void NSR_RefreshAddresses(void);
+
+/* Procedure to get local reference ID corresponding to a source */
+extern uint32_t NSR_GetLocalRefid(IPAddr *address);
+
+/* This routine is called by ntp_io when a new packet arrives off the network */
+extern void NSR_ProcessRx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                          NTP_Local_Timestamp *rx_ts, NTP_Packet *message, int length);
+
+/* This routine is called by ntp_io when a packet was sent to the network and
+   an accurate transmit timestamp was captured */
+extern void NSR_ProcessTx(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
+                          NTP_Local_Timestamp *tx_ts, NTP_Packet *message, int length);
+
+/* Initialisation function */
+extern void NSR_Initialise(void);
+
+/* Finalisation function */
+extern void NSR_Finalise(void);
+
+/* This routine is used to indicate that sources whose IP addresses
+   match a particular subnet should be set online or offline.  It returns
+   a flag indicating whether any hosts matched the address. */
+extern int NSR_SetConnectivity(IPAddr *mask, IPAddr *address, SRC_Connectivity connectivity);
+
+extern int NSR_ModifyMinpoll(IPAddr *address, int new_minpoll);
+
+extern int NSR_ModifyMaxpoll(IPAddr *address, int new_maxpoll);
+
+extern int NSR_ModifyMaxdelay(IPAddr *address, double new_max_delay);
+
+extern int NSR_ModifyMaxdelayratio(IPAddr *address, double new_max_delay_ratio);
+
+extern int NSR_ModifyMaxdelaydevratio(IPAddr *address, double new_max_delay_ratio);
+
+extern int NSR_ModifyMinstratum(IPAddr *address, int new_min_stratum);
+
+extern int NSR_ModifyPolltarget(IPAddr *address, int new_poll_target);
+
+extern int NSR_InitiateSampleBurst(int n_good_samples, int n_total_samples, IPAddr *mask, IPAddr *address);
+
+extern void NSR_ReportSource(RPT_SourceReport *report, struct timespec *now);
+
+extern int NSR_GetNTPReport(RPT_NTPReport *report);
+
+extern void NSR_GetActivityReport(RPT_ActivityReport *report);
+
+#endif /* GOT_NTP_SOURCES_H */