-
Notifications
You must be signed in to change notification settings - Fork 41
/
pktlength.c
225 lines (191 loc) · 10.1 KB
/
pktlength.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
/*
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 */
{ 0, 0 }, /* LOCAL2 - not supported */
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 */
REQ_LENGTH_ENTRY(modify_select_opts, null), /* MODIFY_SELECTOPTS */
REQ_LENGTH_ENTRY(modify_offset, null), /* MODIFY_OFFSET */
REQ_LENGTH_ENTRY(local, null), /* LOCAL3 */
};
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 */
0, /* NTP_DATA - not supported */
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 */
0, /* SERVER_STATS3 - not supported */
RPY_LENGTH_ENTRY(server_stats), /* SERVER_STATS4 */
RPY_LENGTH_ENTRY(ntp_data), /* NTP_DATA2 */
};
/* ================================================== */
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];
}
/* ================================================== */