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9ba6e7655c
Handle the NULL and LOGON requests as unknown (invalid) instead of returning the success and failed status respectively. They have been unused for very long time now.
226 lines
10 KiB
C
226 lines
10 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 1997-2002
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* Copyright (C) Miroslav Lichvar 2014-2016
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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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Routines to compute the expected length of a command or reply packet.
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These operate on the RAW NETWORK packets, from the point of view of
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integer endianness within the structures.
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*/
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#include "config.h"
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#include "sysincl.h"
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#include "util.h"
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#include "pktlength.h"
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#define PADDING_LENGTH_(request_length, reply_length) \
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(uint16_t)((request_length) < (reply_length) ? (reply_length) - (request_length) : 0)
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#define PADDING_LENGTH(request_data, reply_data) \
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PADDING_LENGTH_(offsetof(CMD_Request, request_data), offsetof(CMD_Reply, reply_data))
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#define REQ_LENGTH_ENTRY(request_data_field, reply_data_field) \
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{ offsetof(CMD_Request, data.request_data_field.EOR), \
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PADDING_LENGTH(data.request_data_field.EOR, data.reply_data_field.EOR) }
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#define RPY_LENGTH_ENTRY(reply_data_field) \
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offsetof(CMD_Reply, data.reply_data_field.EOR)
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/* ================================================== */
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struct request_length {
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uint16_t command;
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uint16_t padding;
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};
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static const struct request_length request_lengths[] = {
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{ 0, 0 }, /* NULL - not supported */
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REQ_LENGTH_ENTRY(online, null), /* ONLINE */
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REQ_LENGTH_ENTRY(offline, null), /* OFFLINE */
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REQ_LENGTH_ENTRY(burst, null), /* BURST */
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REQ_LENGTH_ENTRY(modify_minpoll, null), /* MODIFY_MINPOLL */
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REQ_LENGTH_ENTRY(modify_maxpoll, null), /* MODIFY_MAXPOLL */
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REQ_LENGTH_ENTRY(dump, null), /* DUMP */
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REQ_LENGTH_ENTRY(modify_maxdelay, null), /* MODIFY_MAXDELAY */
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REQ_LENGTH_ENTRY(modify_maxdelayratio, null), /* MODIFY_MAXDELAYRATIO */
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REQ_LENGTH_ENTRY(modify_maxupdateskew, null), /* MODIFY_MAXUPDATESKEW */
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{ 0, 0 }, /* LOGON - not supported */
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REQ_LENGTH_ENTRY(settime, manual_timestamp), /* SETTIME */
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{ 0, 0 }, /* LOCAL */
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REQ_LENGTH_ENTRY(manual, null), /* MANUAL */
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REQ_LENGTH_ENTRY(null, n_sources), /* N_SOURCES */
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REQ_LENGTH_ENTRY(source_data, source_data), /* SOURCE_DATA */
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REQ_LENGTH_ENTRY(null, null), /* REKEY */
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REQ_LENGTH_ENTRY(allow_deny, null), /* ALLOW */
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REQ_LENGTH_ENTRY(allow_deny, null), /* ALLOWALL */
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REQ_LENGTH_ENTRY(allow_deny, null), /* DENY */
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REQ_LENGTH_ENTRY(allow_deny, null), /* DENYALL */
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REQ_LENGTH_ENTRY(allow_deny, null), /* CMDALLOW */
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REQ_LENGTH_ENTRY(allow_deny, null), /* CMDALLOWALL */
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REQ_LENGTH_ENTRY(allow_deny, null), /* CMDDENY */
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REQ_LENGTH_ENTRY(allow_deny, null), /* CMDDENYALL */
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REQ_LENGTH_ENTRY(ac_check, null), /* ACCHECK */
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REQ_LENGTH_ENTRY(ac_check, null), /* CMDACCHECK */
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{ 0, 0 }, /* ADD_SERVER */
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{ 0, 0 }, /* ADD_PEER */
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REQ_LENGTH_ENTRY(del_source, null), /* DEL_SOURCE */
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REQ_LENGTH_ENTRY(null, null), /* WRITERTC */
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REQ_LENGTH_ENTRY(dfreq, null), /* DFREQ */
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{ 0, 0 }, /* DOFFSET - not supported */
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REQ_LENGTH_ENTRY(null, tracking), /* TRACKING */
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REQ_LENGTH_ENTRY(sourcestats, sourcestats), /* SOURCESTATS */
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REQ_LENGTH_ENTRY(null, rtc), /* RTCREPORT */
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REQ_LENGTH_ENTRY(null, null), /* TRIMRTC */
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REQ_LENGTH_ENTRY(null, null), /* CYCLELOGS */
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{ 0, 0 }, /* SUBNETS_ACCESSED - not supported */
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{ 0, 0 }, /* CLIENT_ACCESSES - not supported */
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{ 0, 0 }, /* CLIENT_ACCESSES_BY_INDEX - not supported */
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REQ_LENGTH_ENTRY(null, manual_list), /* MANUAL_LIST */
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REQ_LENGTH_ENTRY(manual_delete, null), /* MANUAL_DELETE */
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REQ_LENGTH_ENTRY(null, null), /* MAKESTEP */
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REQ_LENGTH_ENTRY(null, activity), /* ACTIVITY */
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REQ_LENGTH_ENTRY(modify_minstratum, null), /* MODIFY_MINSTRATUM */
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REQ_LENGTH_ENTRY(modify_polltarget, null), /* MODIFY_POLLTARGET */
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REQ_LENGTH_ENTRY(modify_maxdelaydevratio, null), /* MODIFY_MAXDELAYDEVRATIO */
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REQ_LENGTH_ENTRY(null, null), /* RESELECT */
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REQ_LENGTH_ENTRY(reselect_distance, null), /* RESELECTDISTANCE */
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REQ_LENGTH_ENTRY(modify_makestep, null), /* MODIFY_MAKESTEP */
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REQ_LENGTH_ENTRY(null, smoothing), /* SMOOTHING */
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REQ_LENGTH_ENTRY(smoothtime, null), /* SMOOTHTIME */
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REQ_LENGTH_ENTRY(null, null), /* REFRESH */
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REQ_LENGTH_ENTRY(null, server_stats), /* SERVER_STATS */
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{ 0, 0 }, /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
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{ 0, 0 }, /* LOCAL2 - not supported */
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REQ_LENGTH_ENTRY(ntp_data, ntp_data), /* NTP_DATA */
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{ 0, 0 }, /* ADD_SERVER2 */
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{ 0, 0 }, /* ADD_PEER2 */
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{ 0, 0 }, /* ADD_SERVER3 */
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{ 0, 0 }, /* ADD_PEER3 */
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REQ_LENGTH_ENTRY(null, null), /* SHUTDOWN */
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REQ_LENGTH_ENTRY(null, null), /* ONOFFLINE */
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REQ_LENGTH_ENTRY(ntp_source, null), /* ADD_SOURCE */
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REQ_LENGTH_ENTRY(ntp_source_name,
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ntp_source_name), /* NTP_SOURCE_NAME */
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REQ_LENGTH_ENTRY(null, null), /* RESET_SOURCES */
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REQ_LENGTH_ENTRY(auth_data, auth_data), /* AUTH_DATA */
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REQ_LENGTH_ENTRY(client_accesses_by_index,
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client_accesses_by_index), /* CLIENT_ACCESSES_BY_INDEX3 */
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REQ_LENGTH_ENTRY(select_data, select_data), /* SELECT_DATA */
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REQ_LENGTH_ENTRY(null, null), /* RELOAD_SOURCES */
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REQ_LENGTH_ENTRY(doffset, null), /* DOFFSET2 */
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REQ_LENGTH_ENTRY(modify_select_opts, null), /* MODIFY_SELECTOPTS */
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REQ_LENGTH_ENTRY(modify_offset, null), /* MODIFY_OFFSET */
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REQ_LENGTH_ENTRY(local, null), /* LOCAL3 */
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};
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static const uint16_t reply_lengths[] = {
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0, /* empty slot */
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RPY_LENGTH_ENTRY(null), /* NULL */
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RPY_LENGTH_ENTRY(n_sources), /* N_SOURCES */
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RPY_LENGTH_ENTRY(source_data), /* SOURCE_DATA */
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0, /* MANUAL_TIMESTAMP */
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RPY_LENGTH_ENTRY(tracking), /* TRACKING */
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RPY_LENGTH_ENTRY(sourcestats), /* SOURCESTATS */
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RPY_LENGTH_ENTRY(rtc), /* RTC */
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0, /* SUBNETS_ACCESSED - not supported */
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0, /* CLIENT_ACCESSES - not supported */
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0, /* CLIENT_ACCESSES_BY_INDEX - not supported */
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0, /* MANUAL_LIST - not supported */
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RPY_LENGTH_ENTRY(activity), /* ACTIVITY */
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RPY_LENGTH_ENTRY(smoothing), /* SMOOTHING */
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0, /* SERVER_STATS - not supported */
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0, /* CLIENT_ACCESSES_BY_INDEX2 - not supported */
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0, /* NTP_DATA - not supported */
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RPY_LENGTH_ENTRY(manual_timestamp), /* MANUAL_TIMESTAMP2 */
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RPY_LENGTH_ENTRY(manual_list), /* MANUAL_LIST2 */
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RPY_LENGTH_ENTRY(ntp_source_name), /* NTP_SOURCE_NAME */
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RPY_LENGTH_ENTRY(auth_data), /* AUTH_DATA */
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RPY_LENGTH_ENTRY(client_accesses_by_index), /* CLIENT_ACCESSES_BY_INDEX3 */
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0, /* SERVER_STATS2 - not supported */
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RPY_LENGTH_ENTRY(select_data), /* SELECT_DATA */
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0, /* SERVER_STATS3 - not supported */
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RPY_LENGTH_ENTRY(server_stats), /* SERVER_STATS4 */
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RPY_LENGTH_ENTRY(ntp_data), /* NTP_DATA2 */
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};
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/* ================================================== */
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int
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PKL_CommandLength(CMD_Request *r)
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{
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uint32_t type;
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int command_length;
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assert(sizeof (request_lengths) / sizeof (request_lengths[0]) == N_REQUEST_TYPES);
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type = ntohs(r->command);
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if (type >= N_REQUEST_TYPES)
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return 0;
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command_length = request_lengths[type].command;
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if (!command_length)
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return 0;
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return command_length + PKL_CommandPaddingLength(r);
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}
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/* ================================================== */
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int
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PKL_CommandPaddingLength(CMD_Request *r)
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{
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uint32_t type;
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if (r->version < PROTO_VERSION_PADDING)
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return 0;
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type = ntohs(r->command);
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if (type >= N_REQUEST_TYPES)
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return 0;
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return request_lengths[ntohs(r->command)].padding;
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}
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/* ================================================== */
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int
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PKL_ReplyLength(CMD_Reply *r)
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{
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uint32_t type;
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assert(sizeof (reply_lengths) / sizeof (reply_lengths[0]) == N_REPLY_TYPES);
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type = ntohs(r->reply);
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/* Note that reply type codes start from 1, not 0 */
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if (type < 1 || type >= N_REPLY_TYPES)
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return 0;
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return reply_lengths[type];
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}
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/* ================================================== */
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