96d652e5bd
Adapt the interleaved symmetric mode for client/server associations. On server, save the state needed for detection and responding in the interleaved mode in the client log. On client, enable the interleaved mode when the server is specified with the xleave option. Always accept responses in basic mode to allow synchronization with servers that don't support the interleaved mode, have too many clients, or have multiple clients behing the same IP address. This is also necessary to prevent DoS attacks on the client by overwriting or flushing the server state. Protect the client's state variables against replay attacks as the timestamps are now needed when processing the subsequent packet.
49 lines
1.9 KiB
C
49 lines
1.9 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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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_LogNTPAccess(IPAddr *client, struct timespec *now);
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extern int CLG_LogCommandAccess(IPAddr *client, struct timespec *now);
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extern int CLG_LimitNTPResponseRate(int index);
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extern int CLG_LimitCommandResponseRate(int index);
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extern void CLG_GetNtpTimestamps(int index, NTP_int64 **rx_ts, NTP_int64 **tx_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, RPT_ClientAccessByIndex_Report *report, 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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