14b8df3702
Instead of keeping one pair of RX and TX timestamp for each address, add a separate RX->TX map using an ordered circular buffer. Save the RX timestamps as 64-bit integers and search them with a combined linear interpolation and binary algorithm. This enables the server to support multiple interleaved clients sharing the same IP address (e.g. NAT) and it will allow other improvements to be implemented later. A drawback is that a single broken client sending interleaved requests at a high rate (without spoofing the source address) can now prevent clients on other addresses from getting interleaved responses. The total number of saved timestamps does not change. It's still determined by the clientloglimit directive. A new option may be added later if needed. The whole buffer is allocated at once, but only on first use to not waste memory on client-only configurations.
62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/*
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chronyd/chronyc - Programs for keeping computer clocks accurate.
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**********************************************************************
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* Copyright (C) Richard P. Curnow 1997-2003
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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**********************************************************************
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=======================================================================
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This module contains facilities for logging access by clients.
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*/
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#ifndef GOT_CLIENTLOG_H
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#define GOT_CLIENTLOG_H
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#include "sysincl.h"
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#include "reports.h"
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typedef enum {
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CLG_NTP = 0,
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CLG_NTSKE,
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CLG_CMDMON,
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} CLG_Service;
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extern void CLG_Initialise(void);
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extern void CLG_Finalise(void);
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extern int CLG_GetClientIndex(IPAddr *client);
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extern int CLG_LogServiceAccess(CLG_Service service, IPAddr *client, struct timespec *now);
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extern int CLG_LimitServiceRate(CLG_Service service, int index);
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extern void CLG_LogAuthNtpRequest(void);
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extern int CLG_GetNtpMinPoll(void);
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/* Functions to save and retrieve timestamps for server interleaved mode */
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extern void CLG_SaveNtpTimestamps(NTP_int64 *rx_ts, struct timespec *tx_ts);
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extern void CLG_UpdateNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts);
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extern int CLG_GetNtpTxTimestamp(NTP_int64 *rx_ts, struct timespec *tx_ts);
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extern void CLG_DisableNtpTimestamps(NTP_int64 *rx_ts);
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/* And some reporting functions, for use by chronyc. */
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extern int CLG_GetNumberOfIndices(void);
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extern int CLG_GetClientAccessReportByIndex(int index, int reset, uint32_t min_hits,
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RPT_ClientAccessByIndex_Report *report,
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struct timespec *now);
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extern void CLG_GetServerStatsReport(RPT_ServerStatsReport *report);
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#endif /* GOT_CLIENTLOG_H */
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