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pktlength.c
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pktlength.c
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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2002
* Copyright (C) Miroslav Lichvar 2014-2016
*
* 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.
*
**********************************************************************
=======================================================================
Routines to compute the expected length of a command or reply packet.
These operate on the RAW NETWORK packets, from the point of view of
integer endianness within the structures.
*/
#include "config.h"
#include "sysincl.h"
#include "util.h"
#include "pktlength.h"
#define PADDING_LENGTH_(request_length, reply_length) \
(uint16_t)((request_length) < (reply_length) ? (reply_length) - (request_length) : 0)
#define PADDING_LENGTH(request_data, reply_data) \
PADDING_LENGTH_(offsetof(CMD_Request, request_data), offsetof(CMD_Reply, reply_data))
#define REQ_LENGTH_ENTRY(request_data_field, reply_data_field) \
{ offsetof(CMD_Request, data.request_data_field.EOR), \
PADDING_LENGTH(data.request_data_field.EOR, data.reply_data_field.EOR) }
#define RPY_LENGTH_ENTRY(reply_data_field) \
offsetof(CMD_Reply, data.reply_data_field.EOR)
/* ================================================== */
struct request_length {
uint16_t command;
uint16_t padding;
};
static const struct request_length request_lengths[] = {
REQ_LENGTH_ENTRY(null, null), /* NULL */
REQ_LENGTH_ENTRY(online, null), /* ONLINE */
REQ_LENGTH_ENTRY(offline, null), /* OFFLINE */
REQ_LENGTH_ENTRY(burst, null), /* BURST */
REQ_LENGTH_ENTRY(modify_minpoll, null), /* MODIFY_MINPOLL */
REQ_LENGTH_ENTRY(modify_maxpoll, null), /* MODIFY_MAXPOLL */
REQ_LENGTH_ENTRY(dump, null), /* DUMP */
REQ_LENGTH_ENTRY(modify_maxdelay, null), /* MODIFY_MAXDELAY */
REQ_LENGTH_ENTRY(modify_maxdelayratio, null), /* MODIFY_MAXDELAYRATIO */
REQ_LENGTH_ENTRY(modify_maxupdateskew, null), /* MODIFY_MAXUPDATESKEW */
REQ_LENGTH_ENTRY(logon, null), /* LOGON */
REQ_LENGTH_ENTRY(settime, manual_timestamp), /* SETTIME */
{ 0, 0 }, /* LOCAL */
REQ_LENGTH_ENTRY(manual, null), /* MANUAL */
REQ_LENGTH_ENTRY(null, n_sources), /* N_SOURCES */
REQ_LENGTH_ENTRY(source_data, source_data), /* SOURCE_DATA */
REQ_LENGTH_ENTRY(null, null), /* REKEY */
REQ_LENGTH_ENTRY(allow_deny, null), /* ALLOW */
REQ_LENGTH_ENTRY(allow_deny, null), /* ALLOWALL */
REQ_LENGTH_ENTRY(allow_deny, null), /* DENY */
REQ_LENGTH_ENTRY(allow_deny, null), /* DENYALL */
REQ_LENGTH_ENTRY(allow_deny, null), /* CMDALLOW */
REQ_LENGTH_ENTRY(allow_deny, null), /* CMDALLOWALL */
REQ_LENGTH_ENTRY(allow_deny, null), /* CMDDENY */
REQ_LENGTH_ENTRY(allow_deny, null), /* CMDDENYALL */
REQ_LENGTH_ENTRY(ac_check, null), /* ACCHECK */
REQ_LENGTH_ENTRY(ac_check, null), /* CMDACCHECK */
{ 0, 0 }, /* ADD_SERVER */
{ 0, 0 }, /* ADD_PEER */
REQ_LENGTH_ENTRY(del_source, null), /* DEL_SOURCE */
REQ_LENGTH_ENTRY(null, null), /* WRITERTC */
REQ_LENGTH_ENTRY(dfreq, null), /* DFREQ */
{ 0, 0 }, /* DOFFSET - not supported */
REQ_LENGTH_ENTRY(null, tracking), /* TRACKING */
REQ_LENGTH_ENTRY(sourcestats, sourcestats), /* SOURCESTATS */
REQ_LENGTH_ENTRY(null, rtc), /* RTCREPORT */
REQ_LENGTH_ENTRY(null, null), /* TRIMRTC */
REQ_LENGTH_ENTRY(null, null), /* CYCLELOGS */
{ 0, 0 }, /* SUBNETS_ACCESSED - not supported */
{ 0, 0 }, /* CLIENT_ACCESSES - not supported */
{ 0, 0 }, /* CLIENT_ACCESSES_BY_INDEX - not supported */
REQ_LENGTH_ENTRY(null, manual_list), /* MANUAL_LIST */
REQ_LENGTH_ENTRY(manual_delete, null), /* MANUAL_DELETE */
REQ_LENGTH_ENTRY(null, null), /* MAKESTEP */
REQ_LENGTH_ENTRY(null, activity), /* ACTIVITY */
REQ_LENGTH_ENTRY(modify_minstratum, null), /* MODIFY_MINSTRATUM */
REQ_LENGTH_ENTRY(modify_polltarget, null), /* MODIFY_POLLTARGET */
REQ_LENGTH_ENTRY(modify_maxdelaydevratio, null), /* MODIFY_MAXDELAYDEVRATIO */
REQ_LENGTH_ENTRY(null, null), /* RESELECT */
REQ_LENGTH_ENTRY(reselect_distance, null), /* RESELECTDISTANCE */
REQ_LENGTH_ENTRY(modify_makestep, null), /* MODIFY_MAKESTEP */
REQ_LENGTH_ENTRY(null, smoothing), /* SMOOTHING */
REQ_LENGTH_ENTRY(smoothtime, null), /* SMOOTHTIME */
REQ_LENGTH_ENTRY(null, null), /* REFRESH */
REQ_LENGTH_ENTRY(null, server_stats), /* SERVER_STATS */
{ 0, 0 }, /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
REQ_LENGTH_ENTRY(local, null), /* LOCAL2 */
REQ_LENGTH_ENTRY(ntp_data, ntp_data), /* NTP_DATA */
{ 0, 0 }, /* ADD_SERVER2 */
{ 0, 0 }, /* ADD_PEER2 */
{ 0, 0 }, /* ADD_SERVER3 */
{ 0, 0 }, /* ADD_PEER3 */
REQ_LENGTH_ENTRY(null, null), /* SHUTDOWN */
REQ_LENGTH_ENTRY(null, null), /* ONOFFLINE */
REQ_LENGTH_ENTRY(ntp_source, null), /* ADD_SOURCE */
REQ_LENGTH_ENTRY(ntp_source_name,
ntp_source_name), /* NTP_SOURCE_NAME */
REQ_LENGTH_ENTRY(null, null), /* RESET_SOURCES */
REQ_LENGTH_ENTRY(auth_data, auth_data), /* AUTH_DATA */
REQ_LENGTH_ENTRY(client_accesses_by_index,
client_accesses_by_index), /* CLIENT_ACCESSES_BY_INDEX3 */
REQ_LENGTH_ENTRY(select_data, select_data), /* SELECT_DATA */
REQ_LENGTH_ENTRY(null, null), /* RELOAD_SOURCES */
REQ_LENGTH_ENTRY(doffset, null), /* DOFFSET2 */
};
static const uint16_t reply_lengths[] = {
0, /* empty slot */
RPY_LENGTH_ENTRY(null), /* NULL */
RPY_LENGTH_ENTRY(n_sources), /* N_SOURCES */
RPY_LENGTH_ENTRY(source_data), /* SOURCE_DATA */
0, /* MANUAL_TIMESTAMP */
RPY_LENGTH_ENTRY(tracking), /* TRACKING */
RPY_LENGTH_ENTRY(sourcestats), /* SOURCESTATS */
RPY_LENGTH_ENTRY(rtc), /* RTC */
0, /* SUBNETS_ACCESSED - not supported */
0, /* CLIENT_ACCESSES - not supported */
0, /* CLIENT_ACCESSES_BY_INDEX - not supported */
0, /* MANUAL_LIST - not supported */
RPY_LENGTH_ENTRY(activity), /* ACTIVITY */
RPY_LENGTH_ENTRY(smoothing), /* SMOOTHING */
0, /* SERVER_STATS - not supported */
0, /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
RPY_LENGTH_ENTRY(ntp_data), /* NTP_DATA */
RPY_LENGTH_ENTRY(manual_timestamp), /* MANUAL_TIMESTAMP2 */
RPY_LENGTH_ENTRY(manual_list), /* MANUAL_LIST2 */
RPY_LENGTH_ENTRY(ntp_source_name), /* NTP_SOURCE_NAME */
RPY_LENGTH_ENTRY(auth_data), /* AUTH_DATA */
RPY_LENGTH_ENTRY(client_accesses_by_index), /* CLIENT_ACCESSES_BY_INDEX3 */
0, /* SERVER_STATS2 - not supported */
RPY_LENGTH_ENTRY(select_data), /* SELECT_DATA */
RPY_LENGTH_ENTRY(server_stats), /* SERVER_STATS3 */
};
/* ================================================== */
int
PKL_CommandLength(CMD_Request *r)
{
uint32_t type;
int command_length;
assert(sizeof (request_lengths) / sizeof (request_lengths[0]) == N_REQUEST_TYPES);
type = ntohs(r->command);
if (type >= N_REQUEST_TYPES)
return 0;
command_length = request_lengths[type].command;
if (!command_length)
return 0;
return command_length + PKL_CommandPaddingLength(r);
}
/* ================================================== */
int
PKL_CommandPaddingLength(CMD_Request *r)
{
uint32_t type;
if (r->version < PROTO_VERSION_PADDING)
return 0;
type = ntohs(r->command);
if (type >= N_REQUEST_TYPES)
return 0;
return request_lengths[ntohs(r->command)].padding;
}
/* ================================================== */
int
PKL_ReplyLength(CMD_Reply *r)
{
uint32_t type;
assert(sizeof (reply_lengths) / sizeof (reply_lengths[0]) == N_REPLY_TYPES);
type = ntohs(r->reply);
/* Note that reply type codes start from 1, not 0 */
if (type < 1 || type >= N_REPLY_TYPES)
return 0;
return reply_lengths[type];
}
/* ================================================== */