| /* |
| 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 */ |
| REQ_LENGTH_ENTRY(doffset, null), /* DOFFSET */ |
| 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 */ |
| REQ_LENGTH_ENTRY(client_accesses_by_index, |
| client_accesses_by_index), /* CLIENT_ACCESSES_BY_INDEX2 */ |
| REQ_LENGTH_ENTRY(local, null), /* LOCAL2 */ |
| REQ_LENGTH_ENTRY(ntp_data, ntp_data), /* NTP_DATA */ |
| { 0, 0 }, /* ADD_SERVER2 */ |
| { 0, 0 }, /* ADD_PEER2 */ |
| REQ_LENGTH_ENTRY(ntp_source, null), /* ADD_SERVER3 */ |
| REQ_LENGTH_ENTRY(ntp_source, null), /* ADD_PEER3 */ |
| REQ_LENGTH_ENTRY(null, null), /* SHUTDOWN */ |
| }; |
| |
| 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 */ |
| RPY_LENGTH_ENTRY(server_stats), /* SERVER_STATS */ |
| RPY_LENGTH_ENTRY(client_accesses_by_index), /* CLIENT_ACCESSES_BY_INDEX2 */ |
| RPY_LENGTH_ENTRY(ntp_data), /* NTP_DATA */ |
| RPY_LENGTH_ENTRY(manual_timestamp), /* MANUAL_TIMESTAMP2 */ |
| RPY_LENGTH_ENTRY(manual_list), /* MANUAL_LIST2 */ |
| }; |
| |
| /* ================================================== */ |
| |
| 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]; |
| } |
| |
| /* ================================================== */ |
| |
