-
Notifications
You must be signed in to change notification settings - Fork 46
/
Copy pathntp_sources.c
1614 lines (1269 loc) · 42 KB
/
ntp_sources.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
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2003
* Copyright (C) Miroslav Lichvar 2011-2012, 2014, 2016, 2020-2024
*
* 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.
*
**********************************************************************
=======================================================================
Functions which manage the pool of NTP sources that we are currently
a client of or peering with.
*/
#include "config.h"
#include "sysincl.h"
#include "array.h"
#include "conf.h"
#include "ntp_sources.h"
#include "ntp_core.h"
#include "ntp_io.h"
#include "util.h"
#include "logging.h"
#include "local.h"
#include "memory.h"
#include "nameserv_async.h"
#include "privops.h"
#include "sched.h"
/* ================================================== */
/* Maximum number of sources */
#define MAX_SOURCES 65536
/* Record type private to this file, used to store information about
particular sources */
typedef struct {
NTP_Remote_Address *remote_addr; /* The address of this source, non-NULL
means this slot in table is in use
(an IPADDR_ID address means the address
is not resolved yet) */
NCR_Instance data; /* Data for the protocol engine for this source */
char *name; /* Name of the source as it was specified
(may be an IP address) */
IPAddr resolved_addr; /* Address resolved from the name, which can be
different from remote_addr (e.g. NTS-KE) */
int family; /* IP family of acceptable resolved addresses
(IPADDR_UNSPEC if any) */
int pool_id; /* ID of the pool from which was this source
added or INVALID_POOL */
int tentative; /* Flag indicating there was no valid response
received from the source yet */
uint32_t conf_id; /* Configuration ID, which can be shared with
different sources in case of a pool */
double last_resolving; /* Time of last name resolving (monotonic) */
} SourceRecord;
/* Hash table of SourceRecord, its size is a power of two and it's never
more than half full */
static ARR_Instance records;
/* Number of sources in the hash table */
static int n_sources;
/* Flag indicating new sources will be started automatically when added */
static int auto_start_sources = 0;
/* Flag indicating a record is currently being modified */
static int record_lock;
/* Last assigned address ID */
static uint32_t last_address_id = 0;
/* Last assigned configuration ID */
static uint32_t last_conf_id = 0;
/* Source scheduled for name resolving (first resolving or replacement) */
struct UnresolvedSource {
/* Current address of the source (IPADDR_ID is used for a single source
with unknown address and IPADDR_UNSPEC for a pool of sources) */
NTP_Remote_Address address;
/* ID of the pool if not a single source */
int pool_id;
/* Name to be resolved */
char *name;
/* Address family to filter resolved addresses */
int family;
/* Flag indicating addresses should be used in a random order */
int random_order;
/* Flag indicating current address should be replaced only if it is
no longer returned by the resolver */
int refreshment;
/* Next unresolved source in the list */
struct UnresolvedSource *next;
};
#define RESOLVE_INTERVAL_UNIT 7
#define MIN_RESOLVE_INTERVAL 2
#define MAX_RESOLVE_INTERVAL 9
#define MAX_REPLACEMENT_INTERVAL 9
static struct UnresolvedSource *unresolved_sources = NULL;
static int resolving_interval = 0;
static int resolving_restart = 0;
static SCH_TimeoutID resolving_id;
static struct UnresolvedSource *resolving_source = NULL;
static NSR_SourceResolvingEndHandler resolving_end_handler = NULL;
#define MAX_POOL_SOURCES 16
#define INVALID_POOL (-1)
/* Pool of sources with the same name */
struct SourcePool {
/* Number of all sources from the pool */
int sources;
/* Number of sources with unresolved address */
int unresolved_sources;
/* Number of non-tentative sources */
int confirmed_sources;
/* Maximum number of confirmed sources */
int max_sources;
};
/* Array of SourcePool (indexed by their ID) */
static ARR_Instance pools;
/* Requested update of a source's address */
struct AddressUpdate {
NTP_Remote_Address old_address;
NTP_Remote_Address new_address;
};
/* Update saved when record_lock is true */
static struct AddressUpdate saved_address_update;
/* ================================================== */
/* Forward prototypes */
static void resolve_sources(void);
static void rehash_records(void);
static void handle_saved_address_update(void);
static void clean_source_record(SourceRecord *record);
static void remove_pool_sources(int pool_id, int tentative, int unresolved);
static void remove_unresolved_source(struct UnresolvedSource *us);
static void
slew_sources(struct timespec *raw,
struct timespec *cooked,
double dfreq,
double doffset,
LCL_ChangeType change_type,
void *anything);
/* ================================================== */
/* Flag indicating whether module is initialised */
static int initialised = 0;
/* ================================================== */
static SourceRecord *
get_record(unsigned index)
{
return (SourceRecord *)ARR_GetElement(records, index);
}
/* ================================================== */
static struct SourcePool *
get_pool(unsigned index)
{
return (struct SourcePool *)ARR_GetElement(pools, index);
}
/* ================================================== */
void
NSR_Initialise(void)
{
n_sources = 0;
resolving_id = 0;
initialised = 1;
records = ARR_CreateInstance(sizeof (SourceRecord));
rehash_records();
pools = ARR_CreateInstance(sizeof (struct SourcePool));
LCL_AddParameterChangeHandler(slew_sources, NULL);
}
/* ================================================== */
void
NSR_Finalise(void)
{
NSR_RemoveAllSources();
LCL_RemoveParameterChangeHandler(slew_sources, NULL);
ARR_DestroyInstance(records);
ARR_DestroyInstance(pools);
SCH_RemoveTimeout(resolving_id);
/* Leave the unresolved sources allocated if the async resolver is running
to avoid reading the name from freed memory. The handler will not be
called as the scheduler should no longer be running at this point. */
if (!resolving_source) {
while (unresolved_sources)
remove_unresolved_source(unresolved_sources);
}
initialised = 0;
}
/* ================================================== */
/* Find a slot matching an IP address. It is assumed that there can
only ever be one record for a particular IP address. */
static int
find_slot(IPAddr *ip_addr, int *slot)
{
SourceRecord *record;
uint32_t hash;
unsigned int i, size;
size = ARR_GetSize(records);
*slot = 0;
switch (ip_addr->family) {
case IPADDR_INET4:
case IPADDR_INET6:
case IPADDR_ID:
break;
default:
return 0;
}
hash = UTI_IPToHash(ip_addr);
for (i = 0; i < size / 2; i++) {
/* Use quadratic probing */
*slot = (hash + (i + i * i) / 2) % size;
record = get_record(*slot);
if (!record->remote_addr)
break;
if (UTI_CompareIPs(&record->remote_addr->ip_addr, ip_addr, NULL) == 0)
return 1;
}
return 0;
}
/* ================================================== */
/* Find a slot matching an IP address and port. The function returns:
0 => IP not matched, empty slot returned if a valid address was provided
1 => Only IP matched, port doesn't match
2 => Both IP and port matched. */
static int
find_slot2(NTP_Remote_Address *remote_addr, int *slot)
{
if (!find_slot(&remote_addr->ip_addr, slot))
return 0;
return get_record(*slot)->remote_addr->port == remote_addr->port ? 2 : 1;
}
/* ================================================== */
/* Check if hash table of given size is sufficient to contain sources */
static int
check_hashtable_size(unsigned int sources, unsigned int size)
{
return sources * 2 <= size;
}
/* ================================================== */
static void
rehash_records(void)
{
SourceRecord *temp_records;
unsigned int i, old_size, new_size;
int slot;
assert(!record_lock);
old_size = ARR_GetSize(records);
temp_records = MallocArray(SourceRecord, old_size);
memcpy(temp_records, ARR_GetElements(records), old_size * sizeof (SourceRecord));
/* The size of the hash table is always a power of two */
for (new_size = 1; !check_hashtable_size(n_sources, new_size); new_size *= 2)
;
ARR_SetSize(records, new_size);
for (i = 0; i < new_size; i++)
get_record(i)->remote_addr = NULL;
for (i = 0; i < old_size; i++) {
if (!temp_records[i].remote_addr)
continue;
if (find_slot2(temp_records[i].remote_addr, &slot) != 0)
assert(0);
*get_record(slot) = temp_records[i];
}
Free(temp_records);
}
/* ================================================== */
static void
log_source(SourceRecord *record, int addition, int once_per_pool)
{
int pool, log_addr;
char *ip_str;
if (once_per_pool && record->pool_id != INVALID_POOL) {
if (get_pool(record->pool_id)->sources > 1)
return;
pool = 1;
log_addr = 0;
} else {
ip_str = UTI_IPToString(&record->remote_addr->ip_addr);
pool = 0;
log_addr = strcmp(record->name, ip_str) != 0;
}
LOG(LOG_GetContextSeverity(LOGC_Command | LOGC_SourceFile), "%s %s %s%s%s%s",
addition ? "Added" : "Removed", pool ? "pool" : "source",
log_addr ? ip_str : record->name,
log_addr ? " (" : "", log_addr ? record->name : "", log_addr ? ")" : "");
}
/* ================================================== */
/* Procedure to add a new source */
static NSR_Status
add_source(NTP_Remote_Address *remote_addr, char *name, int family, NTP_Source_Type type,
SourceParameters *params, int pool_id, uint32_t conf_id)
{
SourceRecord *record;
int slot;
assert(initialised);
/* Find empty bin & check that we don't have the address already */
if (find_slot2(remote_addr, &slot) != 0) {
return NSR_AlreadyInUse;
} else if (!name && !UTI_IsIPReal(&remote_addr->ip_addr)) {
/* Name is required for non-real addresses */
return NSR_InvalidName;
} else if (n_sources >= MAX_SOURCES) {
return NSR_TooManySources;
} else {
if (remote_addr->ip_addr.family != IPADDR_INET4 &&
remote_addr->ip_addr.family != IPADDR_INET6 &&
remote_addr->ip_addr.family != IPADDR_ID) {
return NSR_InvalidAF;
} else {
n_sources++;
if (!check_hashtable_size(n_sources, ARR_GetSize(records))) {
rehash_records();
if (find_slot2(remote_addr, &slot) != 0)
assert(0);
}
assert(!record_lock);
record_lock = 1;
record = get_record(slot);
record->name = Strdup(name ? name : UTI_IPToString(&remote_addr->ip_addr));
record->data = NCR_CreateInstance(remote_addr, type, params, record->name);
record->remote_addr = NCR_GetRemoteAddress(record->data);
record->resolved_addr = remote_addr->ip_addr;
record->family = family;
record->pool_id = pool_id;
record->tentative = 1;
record->conf_id = conf_id;
record->last_resolving = SCH_GetLastEventMonoTime();
record_lock = 0;
if (record->pool_id != INVALID_POOL) {
get_pool(record->pool_id)->sources++;
if (!UTI_IsIPReal(&remote_addr->ip_addr))
get_pool(record->pool_id)->unresolved_sources++;
}
if (auto_start_sources && UTI_IsIPReal(&remote_addr->ip_addr))
NCR_StartInstance(record->data);
log_source(record, 1, 1);
/* The new instance is allowed to change its address immediately */
handle_saved_address_update();
return NSR_Success;
}
}
}
/* ================================================== */
static NSR_Status
change_source_address(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr,
int replacement)
{
int slot1, slot2, found;
SourceRecord *record;
LOG_Severity severity;
char *name;
found = find_slot2(old_addr, &slot1);
if (found != 2)
return NSR_NoSuchSource;
/* Make sure there is no other source using the new address (with the same
or different port), but allow a source to have its port changed */
found = find_slot2(new_addr, &slot2);
if (found == 2 || (found != 0 && slot1 != slot2))
return NSR_AlreadyInUse;
assert(!record_lock);
record_lock = 1;
record = get_record(slot1);
NCR_ChangeRemoteAddress(record->data, new_addr, !replacement);
if (replacement)
record->resolved_addr = new_addr->ip_addr;
BRIEF_ASSERT(record->remote_addr == NCR_GetRemoteAddress(record->data) &&
UTI_CompareIPs(&record->remote_addr->ip_addr, &new_addr->ip_addr, NULL) == 0);
if (!UTI_IsIPReal(&old_addr->ip_addr) && UTI_IsIPReal(&new_addr->ip_addr)) {
if (auto_start_sources)
NCR_StartInstance(record->data);
if (record->pool_id != INVALID_POOL)
get_pool(record->pool_id)->unresolved_sources--;
}
if (!record->tentative) {
record->tentative = 1;
if (record->pool_id != INVALID_POOL)
get_pool(record->pool_id)->confirmed_sources--;
}
record_lock = 0;
name = record->name;
severity = UTI_IsIPReal(&old_addr->ip_addr) ? LOGS_INFO : LOGS_DEBUG;
if (found == 0) {
/* The hash table must be rebuilt for the changed address */
rehash_records();
LOG(severity, "Source %s %s %s (%s)", UTI_IPToString(&old_addr->ip_addr),
replacement ? "replaced with" : "changed to",
UTI_IPToString(&new_addr->ip_addr), name);
} else {
LOG(severity, "Source %s (%s) changed port to %d",
UTI_IPToString(&new_addr->ip_addr), name, new_addr->port);
}
return NSR_Success;
}
/* ================================================== */
static void
handle_saved_address_update(void)
{
if (!UTI_IsIPReal(&saved_address_update.old_address.ip_addr))
return;
if (change_source_address(&saved_address_update.old_address,
&saved_address_update.new_address, 0) != NSR_Success)
/* This is expected to happen only if the old address is wrong */
LOG(LOGS_ERR, "Could not change %s to %s",
UTI_IPSockAddrToString(&saved_address_update.old_address),
UTI_IPSockAddrToString(&saved_address_update.new_address));
saved_address_update.old_address.ip_addr.family = IPADDR_UNSPEC;
}
/* ================================================== */
static int
replace_source_connectable(NTP_Remote_Address *old_addr, NTP_Remote_Address *new_addr)
{
if (!NIO_IsServerConnectable(new_addr)) {
DEBUG_LOG("%s not connectable", UTI_IPToString(&new_addr->ip_addr));
return 0;
}
if (change_source_address(old_addr, new_addr, 1) == NSR_AlreadyInUse)
return 0;
handle_saved_address_update();
return 1;
}
/* ================================================== */
static void
process_resolved_name(struct UnresolvedSource *us, IPAddr *ip_addrs, int n_addrs)
{
NTP_Remote_Address old_addr, new_addr;
SourceRecord *record;
unsigned short first = 0;
int i, j, slot;
/* Keep using the current address if it is being refreshed and it is
still included in the resolved addresses */
if (us->refreshment) {
assert(us->pool_id == INVALID_POOL);
for (i = 0; i < n_addrs; i++) {
if (find_slot2(&us->address, &slot) == 2 &&
UTI_CompareIPs(&get_record(slot)->resolved_addr, &ip_addrs[i], NULL) == 0) {
DEBUG_LOG("%s still fresh", UTI_IPToString(&us->address.ip_addr));
return;
}
}
}
if (us->random_order)
UTI_GetRandomBytes(&first, sizeof (first));
for (i = 0; i < n_addrs; i++) {
new_addr.ip_addr = ip_addrs[((unsigned int)i + first) % n_addrs];
DEBUG_LOG("(%d) %s", i + 1, UTI_IPToString(&new_addr.ip_addr));
/* Skip addresses not from the requested family */
if (us->family != IPADDR_UNSPEC && us->family != new_addr.ip_addr.family)
continue;
if (us->pool_id != INVALID_POOL) {
/* In the pool resolving mode, try to replace a source from
the pool which does not have a real address yet */
for (j = 0; j < ARR_GetSize(records); j++) {
record = get_record(j);
if (!record->remote_addr || record->pool_id != us->pool_id ||
UTI_IsIPReal(&record->remote_addr->ip_addr))
continue;
old_addr = *record->remote_addr;
new_addr.port = old_addr.port;
if (replace_source_connectable(&old_addr, &new_addr))
;
break;
}
} else {
new_addr.port = us->address.port;
if (replace_source_connectable(&us->address, &new_addr))
break;
}
}
}
/* ================================================== */
static int
is_resolved(struct UnresolvedSource *us)
{
int slot;
if (us->pool_id != INVALID_POOL) {
return get_pool(us->pool_id)->unresolved_sources <= 0;
} else {
/* If the address is no longer present, it was removed or replaced
(i.e. resolved) */
return find_slot2(&us->address, &slot) == 0;
}
}
/* ================================================== */
static void
resolve_sources_timeout(void *arg)
{
resolving_id = 0;
resolve_sources();
}
/* ================================================== */
static void
name_resolve_handler(DNS_Status status, int n_addrs, IPAddr *ip_addrs, void *anything)
{
struct UnresolvedSource *us, *next;
us = (struct UnresolvedSource *)anything;
assert(us == resolving_source);
assert(resolving_id == 0);
DEBUG_LOG("%s resolved to %d addrs", us->name, n_addrs);
switch (status) {
case DNS_TryAgain:
break;
case DNS_Success:
process_resolved_name(us, ip_addrs, n_addrs);
break;
case DNS_Failure:
LOG(LOGS_WARN, "Invalid host %s", us->name);
break;
default:
assert(0);
}
next = us->next;
/* Don't repeat the resolving if it (permanently) failed, it was a
replacement of a real address, a refreshment, or all addresses are
already resolved */
if (status == DNS_Failure || UTI_IsIPReal(&us->address.ip_addr) ||
us->refreshment || is_resolved(us))
remove_unresolved_source(us);
/* If a restart was requested and this was the last source in the list,
start with the first source again (if there still is one) */
if (!next && resolving_restart) {
DEBUG_LOG("Restarting");
next = unresolved_sources;
resolving_restart = 0;
}
resolving_source = next;
if (next) {
/* Continue with the next source in the list */
DEBUG_LOG("resolving %s", next->name);
DNS_Name2IPAddressAsync(next->name, name_resolve_handler, next);
} else {
/* This was the last source in the list. If some sources couldn't
be resolved, try again in exponentially increasing interval. */
if (unresolved_sources) {
resolving_interval = CLAMP(MIN_RESOLVE_INTERVAL, resolving_interval + 1,
MAX_RESOLVE_INTERVAL);
resolving_id = SCH_AddTimeoutByDelay(RESOLVE_INTERVAL_UNIT * (1 << resolving_interval),
resolve_sources_timeout, NULL);
} else {
resolving_interval = 0;
}
/* This round of resolving is done */
if (resolving_end_handler)
(resolving_end_handler)();
}
}
/* ================================================== */
static void
resolve_sources(void)
{
struct UnresolvedSource *us, *next, *i;
assert(!resolving_source);
/* Remove sources that don't need to be resolved anymore */
for (i = unresolved_sources; i; i = next) {
next = i->next;
if (is_resolved(i))
remove_unresolved_source(i);
}
if (!unresolved_sources)
return;
PRV_ReloadDNS();
/* Start with the first source in the list, name_resolve_handler
will iterate over the rest */
us = unresolved_sources;
resolving_source = us;
DEBUG_LOG("resolving %s", us->name);
DNS_Name2IPAddressAsync(us->name, name_resolve_handler, us);
}
/* ================================================== */
static void
append_unresolved_source(struct UnresolvedSource *us)
{
struct UnresolvedSource **i;
int n;
for (i = &unresolved_sources, n = 0; *i; i = &(*i)->next, n++)
;
*i = us;
us->next = NULL;
DEBUG_LOG("Added unresolved source #%d pool_id=%d random=%d refresh=%d",
n + 1, us->pool_id, us->random_order, us->refreshment);
}
/* ================================================== */
static void
remove_unresolved_source(struct UnresolvedSource *us)
{
struct UnresolvedSource **i;
for (i = &unresolved_sources; *i; i = &(*i)->next) {
if (*i == us) {
*i = us->next;
Free(us->name);
Free(us);
break;
}
}
}
/* ================================================== */
static int get_unused_pool_id(void)
{
struct UnresolvedSource *us;
int i;
for (i = 0; i < ARR_GetSize(pools); i++) {
if (get_pool(i)->sources > 0)
continue;
/* Make sure there is no name waiting to be resolved using this pool */
for (us = unresolved_sources; us; us = us->next) {
if (us->pool_id == i)
break;
}
if (us)
continue;
return i;
}
return INVALID_POOL;
}
/* ================================================== */
static uint32_t
get_next_conf_id(uint32_t *conf_id)
{
SourceRecord *record;
unsigned int i;
again:
last_conf_id++;
/* Make sure the ID is not already used (after 32-bit wraparound) */
for (i = 0; i < ARR_GetSize(records); i++) {
record = get_record(i);
if (record->remote_addr && record->conf_id == last_conf_id)
goto again;
}
if (conf_id)
*conf_id = last_conf_id;
return last_conf_id;
}
/* ================================================== */
NSR_Status
NSR_AddSource(NTP_Remote_Address *remote_addr, NTP_Source_Type type,
SourceParameters *params, uint32_t *conf_id)
{
return add_source(remote_addr, NULL, IPADDR_UNSPEC, type, params, INVALID_POOL,
get_next_conf_id(conf_id));
}
/* ================================================== */
NSR_Status
NSR_AddSourceByName(char *name, int family, int port, int pool, NTP_Source_Type type,
SourceParameters *params, uint32_t *conf_id)
{
struct UnresolvedSource *us;
struct SourcePool *sp;
NTP_Remote_Address remote_addr;
int i, new_sources, pool_id;
uint32_t cid;
/* If the name is an IP address, add the source with the address directly */
if (UTI_StringToIP(name, &remote_addr.ip_addr)) {
remote_addr.port = port;
if (family != IPADDR_UNSPEC && family != remote_addr.ip_addr.family)
return NSR_InvalidAF;
return add_source(&remote_addr, name, IPADDR_UNSPEC, type, params, INVALID_POOL,
get_next_conf_id(conf_id));
}
/* Make sure the name is at least printable and has no spaces */
for (i = 0; name[i] != '\0'; i++) {
if (!isgraph((unsigned char)name[i]))
return NSR_InvalidName;
}
us = MallocNew(struct UnresolvedSource);
us->name = Strdup(name);
us->family = family;
us->random_order = 0;
us->refreshment = 0;
remote_addr.ip_addr.family = IPADDR_ID;
remote_addr.ip_addr.addr.id = ++last_address_id;
remote_addr.port = port;
if (!pool) {
us->pool_id = INVALID_POOL;
us->address = remote_addr;
new_sources = 1;
} else {
pool_id = get_unused_pool_id();
if (pool_id != INVALID_POOL) {
sp = get_pool(pool_id);
} else {
sp = ARR_GetNewElement(pools);
pool_id = ARR_GetSize(pools) - 1;
}
sp->sources = 0;
sp->unresolved_sources = 0;
sp->confirmed_sources = 0;
sp->max_sources = CLAMP(1, params->max_sources, MAX_POOL_SOURCES);
us->pool_id = pool_id;
us->address.ip_addr.family = IPADDR_UNSPEC;
new_sources = MIN(2 * sp->max_sources, MAX_POOL_SOURCES);
}
append_unresolved_source(us);
cid = get_next_conf_id(conf_id);
for (i = 0; i < new_sources; i++) {
if (i > 0)
remote_addr.ip_addr.addr.id = ++last_address_id;
if (add_source(&remote_addr, name, family, type, params, us->pool_id, cid) != NSR_Success)
return NSR_TooManySources;
}
return NSR_UnresolvedName;
}
/* ================================================== */
const char *
NSR_StatusToString(NSR_Status status)
{
switch (status) {
case NSR_Success:
return "Success";
case NSR_NoSuchSource:
return "No such source";
case NSR_AlreadyInUse:
return "Already in use";
case NSR_TooManySources:
return "Too many sources";
case NSR_InvalidAF:
return "Invalid address";
case NSR_InvalidName:
return "Invalid name";
case NSR_UnresolvedName:
return "Unresolved name";
default:
return "?";
}
}
/* ================================================== */
void
NSR_SetSourceResolvingEndHandler(NSR_SourceResolvingEndHandler handler)
{
resolving_end_handler = handler;
}
/* ================================================== */
void
NSR_ResolveSources(void)
{
/* Try to resolve unresolved sources now */
if (unresolved_sources) {
/* Allow only one resolving to be running at a time */
if (!resolving_source) {
if (resolving_id != 0) {
SCH_RemoveTimeout(resolving_id);
resolving_id = 0;
resolving_interval--;
}
resolve_sources();
} else {
/* Try again as soon as the current resolving ends */
resolving_restart = 1;
}
} else {
/* No unresolved sources, we are done */
if (resolving_end_handler)
(resolving_end_handler)();
}
}
/* ================================================== */
void NSR_StartSources(void)
{
NTP_Remote_Address *addr;
unsigned int i;
for (i = 0; i < ARR_GetSize(records); i++) {
addr = get_record(i)->remote_addr;
if (!addr || !UTI_IsIPReal(&addr->ip_addr))
continue;
NCR_StartInstance(get_record(i)->data);
}
}
/* ================================================== */
void NSR_AutoStartSources(void)
{
auto_start_sources = 1;
}
/* ================================================== */
static void
clean_source_record(SourceRecord *record)
{
assert(record->remote_addr);
if (record->pool_id != INVALID_POOL) {
struct SourcePool *pool = get_pool(record->pool_id);
pool->sources--;
if (!UTI_IsIPReal(&record->remote_addr->ip_addr))
pool->unresolved_sources--;
if (!record->tentative)
pool->confirmed_sources--;
if (pool->max_sources > pool->sources)
pool->max_sources = pool->sources;
}
record->remote_addr = NULL;
NCR_DestroyInstance(record->data);
Free(record->name);
n_sources--;
}
/* ================================================== */
/* Procedure to remove a source. We don't bother whether the port
address is matched - we're only interested in removing a record for
the right IP address. */
NSR_Status
NSR_RemoveSource(IPAddr *address)
{
int slot;
assert(initialised);
if (find_slot(address, &slot) == 0)
return NSR_NoSuchSource;