aboutsummaryrefslogtreecommitdiffstats
path: root/ntpdate/ntpdate.c
blob: f6c5156ee20a6cfd8e26445d9fbd46ac57387b64 (plain) (blame)
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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
/*
 * ntpdate - set the time of day by polling one or more NTP servers
 */

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#ifdef HAVE_NETINFO
#include <netinfo/ni.h>
#endif

#include "ntp_machine.h"
#include "ntp_fp.h"
#include "ntp.h"
#include "ntp_io.h"
#include "timevalops.h"
#include "ntpdate.h"
#include "ntp_string.h"
#include "ntp_syslog.h"
#include "ntp_select.h"
#include "ntp_stdlib.h"
#include <ssl_applink.c>

#include "isc/net.h"
#include "isc/result.h"
#include "isc/sockaddr.h"

#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif

#include <stdio.h>
#include <signal.h>
#include <ctype.h>
#ifdef HAVE_POLL_H
# include <poll.h>
#endif
#ifdef HAVE_SYS_SIGNAL_H
# include <sys/signal.h>
#endif
#ifdef HAVE_SYS_IOCTL_H
# include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
#endif

#include <arpa/inet.h>

#ifdef SYS_VXWORKS
# include "ioLib.h"
# include "sockLib.h"
# include "timers.h"

/* select wants a zero structure ... */
struct timeval timeout = {0,0};
#elif defined(SYS_WINNT)
/*
 * Windows does not abort a select select call if SIGALRM goes off
 * so a 200 ms timeout is needed (TIMER_HZ is 5).
 */
struct sock_timeval timeout = {0,1000000/TIMER_HZ};
#else
struct timeval timeout = {60,0};
#endif

#ifdef HAVE_NETINFO
#include <netinfo/ni.h>
#endif

#include "recvbuff.h"

#ifdef SYS_WINNT
#define TARGET_RESOLUTION 1  /* Try for 1-millisecond accuracy
				on Windows NT timers. */
#pragma comment(lib, "winmm")
isc_boolean_t ntp_port_inuse(int af, u_short port);
UINT wTimerRes;
#endif /* SYS_WINNT */

/*
 * Scheduling priority we run at
 */
#ifndef SYS_VXWORKS
# define	NTPDATE_PRIO	(-12)
#else
# define	NTPDATE_PRIO	(100)
#endif

#ifdef HAVE_TIMER_CREATE
/* POSIX TIMERS - vxWorks doesn't have itimer - casey */
static timer_t ntpdate_timerid;
#endif

/*
 * Compatibility stuff for Version 2
 */
#define NTP_MAXSKW	0x28f	/* 0.01 sec in fp format */
#define NTP_MINDIST	0x51f	/* 0.02 sec in fp format */
#define PEER_MAXDISP	(64*FP_SECOND)	/* maximum dispersion (fp 64) */
#define NTP_INFIN	15	/* max stratum, infinity a la Bellman-Ford */
#define NTP_MAXWGT	(8*FP_SECOND)	/* maximum select weight 8 seconds */
#define NTP_MAXLIST	5	/* maximum select list size */
#define PEER_SHIFT	8	/* 8 suitable for crystal time base */

/*
 * for get_systime()
 */
s_char	sys_precision;		/* local clock precision (log2 s) */

/*
 * File descriptor masks etc. for call to select
 */

int ai_fam_templ;
int nbsock;			/* the number of sockets used */
SOCKET fd[MAX_AF];
int fd_family[MAX_AF];		/* to remember the socket family */
#ifdef HAVE_POLL_H
struct pollfd fdmask[MAX_AF];
#else
fd_set fdmask;
SOCKET maxfd;
#endif
int polltest = 0;

/*
 * Initializing flag.  All async routines watch this and only do their
 * thing when it is clear.
 */
int initializing = 1;

/*
 * Alarm flag.	Set when an alarm occurs
 */
volatile int alarm_flag = 0;

/*
 * Simple query flag.
 */
int simple_query = 0;

/*
 * Unprivileged port flag.
 */
int unpriv_port = 0;

/*
 * Program name.
 */
char const *progname;

/*
 * Systemwide parameters and flags
 */
int sys_samples = 0;		/* number of samples/server, will be modified later */
u_long sys_timeout = DEFTIMEOUT; /* timeout time, in TIMER_HZ units */
struct server *sys_servers;	/* the server list */
int sys_numservers = 0; 	/* number of servers to poll */
int sys_authenticate = 0;	/* true when authenticating */
u_int32 sys_authkey = 0;	/* set to authentication key in use */
u_long sys_authdelay = 0;	/* authentication delay */
int sys_version = NTP_VERSION;	/* version to poll with */

/*
 * The current internal time
 */
u_long current_time = 0;

/*
 * Counter for keeping track of completed servers
 */
int complete_servers = 0;

/*
 * File of encryption keys
 */

#ifndef KEYFILE
# ifndef SYS_WINNT
#define KEYFILE 	"/etc/ntp.keys"
# else
#define KEYFILE 	"%windir%\\ntp.keys"
# endif /* SYS_WINNT */
#endif /* KEYFILE */

#ifndef SYS_WINNT
const char *key_file = KEYFILE;
#else
char key_file_storage[MAX_PATH+1], *key_file ;
#endif	 /* SYS_WINNT */

/*
 * Miscellaneous flags
 */
int verbose = 0;
int always_step = 0;
int never_step = 0;

int 	ntpdatemain (int, char **);

static	void	transmit	(struct server *);
static	void	receive 	(struct recvbuf *);
static	void	server_data (struct server *, s_fp, l_fp *, u_fp);
static	void	clock_filter	(struct server *);
static	struct server *clock_select (void);
static	int clock_adjust	(void);
static	void	addserver	(char *);
static	struct server *findserver (sockaddr_u *);
		void	timer		(void);
static	void	init_alarm	(void);
#ifndef SYS_WINNT
static	RETSIGTYPE alarming (int);
#endif /* SYS_WINNT */
static	void	init_io 	(void);
static	void	sendpkt 	(sockaddr_u *, struct pkt *, int);
void	input_handler	(void);

static	int l_adj_systime	(l_fp *);
static	int l_step_systime	(l_fp *);

static	void	print_server (struct server *, FILE *);

#ifdef SYS_WINNT
int 	on = 1;
WORD	wVersionRequested;
WSADATA	wsaData;
#endif /* SYS_WINNT */

#ifdef NO_MAIN_ALLOWED
CALL(ntpdate,"ntpdate",ntpdatemain);

void clear_globals()
{
  /*
   * Debugging flag
   */
  debug = 0;

  ntp_optind = 0;
  /*
   * Initializing flag.  All async routines watch this and only do their
   * thing when it is clear.
   */
  initializing = 1;

  /*
   * Alarm flag.  Set when an alarm occurs
   */
  alarm_flag = 0;

  /*
   * Simple query flag.
   */
  simple_query = 0;

  /*
   * Unprivileged port flag.
   */
  unpriv_port = 0;

  /*
   * Systemwide parameters and flags
   */
  sys_numservers = 0;	  /* number of servers to poll */
  sys_authenticate = 0;   /* true when authenticating */
  sys_authkey = 0;	   /* set to authentication key in use */
  sys_authdelay = 0;   /* authentication delay */
  sys_version = NTP_VERSION;  /* version to poll with */

  /*
   * The current internal time
   */
  current_time = 0;

  /*
   * Counter for keeping track of completed servers
   */
  complete_servers = 0;
  verbose = 0;
  always_step = 0;
  never_step = 0;
}
#endif

#ifdef HAVE_NETINFO
static ni_namelist *getnetinfoservers (void);
#endif

/*
 * Main program.  Initialize us and loop waiting for I/O and/or
 * timer expiries.
 */
#ifndef NO_MAIN_ALLOWED
int
main(
	int argc,
	char *argv[]
	)
{
	return ntpdatemain (argc, argv);
}
#endif /* NO_MAIN_ALLOWED */

int
ntpdatemain (
	int argc,
	char *argv[]
	)
{
	int was_alarmed;
	int tot_recvbufs;
	struct recvbuf *rbuf;
	l_fp tmp;
	int errflg;
	int c;
	int nfound;

#ifdef HAVE_NETINFO
	ni_namelist *netinfoservers;
#endif
#ifdef SYS_WINNT
	key_file = key_file_storage;

	if (!ExpandEnvironmentStrings(KEYFILE, key_file, MAX_PATH))
		msyslog(LOG_ERR, "ExpandEnvironmentStrings(KEYFILE) failed: %m");

	ssl_applink();
#endif /* SYS_WINNT */

#ifdef NO_MAIN_ALLOWED
	clear_globals();
#endif

	init_lib();	/* sets up ipv4_works, ipv6_works */

	/* Check to see if we have IPv6. Otherwise default to IPv4 */
	if (!ipv6_works)
		ai_fam_templ = AF_INET;

#ifdef HAVE_NETINFO
	errflg = 0;		/* servers can come from netinfo */
#else
	errflg = (argc < 2);	/* need at least server on cmdline */
#endif
	progname = argv[0];
	syslogit = 0;

	/*
	 * Decode argument list
	 */
	while ((c = ntp_getopt(argc, argv, "46a:bBde:k:o:p:qst:uv")) != EOF)
		switch (c)
		{
		case '4':
			ai_fam_templ = AF_INET;
			break;
		case '6':
			ai_fam_templ = AF_INET6;
			break;
		case 'a':
			c = atoi(ntp_optarg);
			sys_authenticate = 1;
			sys_authkey = c;
			break;
		case 'b':
			always_step++;
			never_step = 0;
			break;
		case 'B':
			never_step++;
			always_step = 0;
			break;
		case 'd':
			++debug;
			break;
		case 'e':
			if (!atolfp(ntp_optarg, &tmp)
			|| tmp.l_ui != 0) {
				(void) fprintf(stderr,
					   "%s: encryption delay %s is unlikely\n",
					   progname, ntp_optarg);
				errflg++;
			} else {
				sys_authdelay = tmp.l_uf;
			}
			break;
		case 'k':
			key_file = ntp_optarg;
			break;
		case 'o':
			sys_version = atoi(ntp_optarg);
			break;
		case 'p':
			c = atoi(ntp_optarg);
			if (c <= 0 || c > NTP_SHIFT) {
				(void) fprintf(stderr,
					   "%s: number of samples (%d) is invalid\n",
					   progname, c);
				errflg++;
			} else {
				sys_samples = c;
			}
			break;
		case 'q':
			simple_query = 1;
			break;
		case 's':
			syslogit = 1;
			break;
		case 't':
			if (!atolfp(ntp_optarg, &tmp)) {
				(void) fprintf(stderr,
					   "%s: timeout %s is undecodeable\n",
					   progname, ntp_optarg);
				errflg++;
			} else {
				sys_timeout = ((LFPTOFP(&tmp) * TIMER_HZ)
					   + 0x8000) >> 16;
				sys_timeout = max(sys_timeout, MINTIMEOUT);
			}
			break;
		case 'v':
			verbose = 1;
			break;
		case 'u':
			unpriv_port = 1;
			break;
		case '?':
			++errflg;
			break;
		default:
			break;
	    }

	if (errflg) {
		(void) fprintf(stderr,
		    "usage: %s [-46bBdqsuv] [-a key#] [-e delay] [-k file] [-p samples] [-o version#] [-t timeo] server ...\n",
		    progname);
		exit(2);
	}

	/*
	 * If number of Samples (-p) not specified by user:
	 * - if a simple_query (-q) just ONE will do
	 * - otherwise the normal is DEFSAMPLES
	 */
	if (sys_samples == 0)
		 sys_samples = (simple_query ? 1 : DEFSAMPLES);

	if (debug || simple_query) {
#ifdef HAVE_SETVBUF
		static char buf[BUFSIZ];
		setvbuf(stdout, buf, _IOLBF, BUFSIZ);
#else
		setlinebuf(stdout);
#endif
	}

	/*
	 * Logging.  Open the syslog if we have to
	 */
	if (syslogit) {
#if !defined (SYS_WINNT) && !defined (SYS_VXWORKS) && !defined SYS_CYGWIN32
# ifndef	LOG_DAEMON
		openlog("ntpdate", LOG_PID);
# else

#  ifndef	LOG_NTP
#	define	LOG_NTP LOG_DAEMON
#  endif
		openlog("ntpdate", LOG_PID | LOG_NDELAY, LOG_NTP);
		if (debug)
			setlogmask(LOG_UPTO(LOG_DEBUG));
		else
			setlogmask(LOG_UPTO(LOG_INFO));
# endif /* LOG_DAEMON */
#endif	/* SYS_WINNT */
	}

	if (debug || verbose)
		msyslog(LOG_NOTICE, "%s", Version);

	/*
	 * Add servers we are going to be polling
	 */
#ifdef HAVE_NETINFO
	netinfoservers = getnetinfoservers();
#endif

	for ( ; ntp_optind < argc; ntp_optind++)
		addserver(argv[ntp_optind]);

#ifdef HAVE_NETINFO
	if (netinfoservers) {
		if ( netinfoservers->ni_namelist_len &&
		    *netinfoservers->ni_namelist_val ) {
			u_int servercount = 0;
			while (servercount < netinfoservers->ni_namelist_len) {
				if (debug) msyslog(LOG_DEBUG,
						   "Adding time server %s from NetInfo configuration.",
						   netinfoservers->ni_namelist_val[servercount]);
				addserver(netinfoservers->ni_namelist_val[servercount++]);
			}
		}
		ni_namelist_free(netinfoservers);
		free(netinfoservers);
	}
#endif

	if (sys_numservers == 0) {
		msyslog(LOG_ERR, "no servers can be used, exiting");
		exit(1);
	}

	/*
	 * Initialize the time of day routines and the I/O subsystem
	 */
	if (sys_authenticate) {
		init_auth();
		if (!authreadkeys(key_file)) {
			msyslog(LOG_ERR, "no key file <%s>, exiting", key_file);
			exit(1);
		}
		authtrust(sys_authkey, 1);
		if (!authistrusted(sys_authkey)) {
			msyslog(LOG_ERR, "authentication key %lu unknown",
				(unsigned long) sys_authkey);
			exit(1);
		}
	}
	init_io();
	init_alarm();

	/*
	 * Set the priority.
	 */
#ifdef SYS_VXWORKS
	taskPrioritySet( taskIdSelf(), NTPDATE_PRIO);
#endif
#if defined(HAVE_ATT_NICE)
	nice (NTPDATE_PRIO);
#endif
#if defined(HAVE_BSD_NICE)
	(void) setpriority(PRIO_PROCESS, 0, NTPDATE_PRIO);
#endif


	initializing = 0;
	was_alarmed = 0;

	while (complete_servers < sys_numservers) {
#ifdef HAVE_POLL_H
		struct pollfd* rdfdes;
		rdfdes = fdmask;
#else
		fd_set rdfdes;
		rdfdes = fdmask;
#endif

		if (alarm_flag) {		/* alarmed? */
			was_alarmed = 1;
			alarm_flag = 0;
		}
		tot_recvbufs = full_recvbuffs();	/* get received buffers */

		if (!was_alarmed && tot_recvbufs == 0) {
			/*
			 * Nothing to do.	 Wait for something.
			 */
#ifdef HAVE_POLL_H
			nfound = poll(rdfdes, (unsigned int)nbsock, timeout.tv_sec * 1000);

#else
			nfound = select(maxfd, &rdfdes, NULL, NULL,
					&timeout);
#endif
			if (nfound > 0)
				input_handler();
			else if (nfound == SOCKET_ERROR)
			{
#ifndef SYS_WINNT
				if (errno != EINTR)
#else
				if (WSAGetLastError() != WSAEINTR)
#endif
					msyslog(LOG_ERR,
#ifdef HAVE_POLL_H
						"poll() error: %m"
#else
						"select() error: %m"
#endif
						);
			} else if (errno != 0) {
#ifndef SYS_VXWORKS
				msyslog(LOG_DEBUG,
#ifdef HAVE_POLL_H
					"poll(): nfound = %d, error: %m",
#else
					"select(): nfound = %d, error: %m",
#endif
					nfound);
#endif
			}
			if (alarm_flag) {		/* alarmed? */
				was_alarmed = 1;
				alarm_flag = 0;
			}
			tot_recvbufs = full_recvbuffs();	/* get received buffers */
		}

		/*
		 * Out here, signals are unblocked.  Call receive
		 * procedure for each incoming packet.
		 */
		rbuf = get_full_recv_buffer();
		while (rbuf != NULL)
		{
			receive(rbuf);
			freerecvbuf(rbuf);
			rbuf = get_full_recv_buffer();
		}

		/*
		 * Call timer to process any timeouts
		 */
		if (was_alarmed) {
			timer();
			was_alarmed = 0;
		}

		/*
		 * Go around again
		 */
	}

	/*
	 * When we get here we've completed the polling of all servers.
	 * Adjust the clock, then exit.
	 */
#ifdef SYS_WINNT
	WSACleanup();
#endif
#ifdef SYS_VXWORKS
	close (fd);
	timer_delete(ntpdate_timerid);
#endif

	return clock_adjust();
}


/*
 * transmit - transmit a packet to the given server, or mark it completed.
 *		This is called by the timeout routine and by the receive
 *		procedure.
 */
static void
transmit(
	register struct server *server
	)
{
	struct pkt xpkt;

	if (server->filter_nextpt < server->xmtcnt) {
		l_fp ts;
		/*
		 * Last message to this server timed out.  Shift
		 * zeros into the filter.
		 */
		L_CLR(&ts);
		server_data(server, 0, &ts, 0);
	}

	if ((int)server->filter_nextpt >= sys_samples) {
		/*
		 * Got all the data we need.  Mark this guy
		 * completed and return.
		 */
		server->event_time = 0;
		complete_servers++;
		return;
	}

	if (debug)
		printf("transmit(%s)\n", stoa(&server->srcadr));

	/*
	 * If we're here, send another message to the server.  Fill in
	 * the packet and let 'er rip.
	 */
	xpkt.li_vn_mode = PKT_LI_VN_MODE(LEAP_NOTINSYNC,
					 sys_version, MODE_CLIENT);
	xpkt.stratum = STRATUM_TO_PKT(STRATUM_UNSPEC);
	xpkt.ppoll = NTP_MINPOLL;
	xpkt.precision = NTPDATE_PRECISION;
	xpkt.rootdelay = htonl(NTPDATE_DISTANCE);
	xpkt.rootdisp = htonl(NTPDATE_DISP);
	xpkt.refid = htonl(NTPDATE_REFID);
	L_CLR(&xpkt.reftime);
	L_CLR(&xpkt.org);
	L_CLR(&xpkt.rec);

	/*
	 * Determine whether to authenticate or not.	If so,
	 * fill in the extended part of the packet and do it.
	 * If not, just timestamp it and send it away.
	 */
	if (sys_authenticate) {
		size_t len;

		xpkt.exten[0] = htonl(sys_authkey);
		get_systime(&server->xmt);
		L_ADDUF(&server->xmt, sys_authdelay);
		HTONL_FP(&server->xmt, &xpkt.xmt);
		len = authencrypt(sys_authkey, (u_int32 *)&xpkt, LEN_PKT_NOMAC);
		sendpkt(&server->srcadr, &xpkt, (int)(LEN_PKT_NOMAC + len));

		if (debug > 1)
			printf("transmit auth to %s\n",
			   stoa(&server->srcadr));
	} else {
		get_systime(&(server->xmt));
		HTONL_FP(&server->xmt, &xpkt.xmt);
		sendpkt(&server->srcadr, &xpkt, LEN_PKT_NOMAC);

		if (debug > 1)
			printf("transmit to %s\n", stoa(&server->srcadr));
	}

	/*
	 * Update the server timeout and transmit count
	 */
	server->event_time = current_time + sys_timeout;
	server->xmtcnt++;
}


/*
 * receive - receive and process an incoming frame
 */
static void
receive(
	struct recvbuf *rbufp
	)
{
	register struct pkt *rpkt;
	register struct server *server;
	register s_fp di;
	l_fp t10, t23, tmp;
	l_fp org;
	l_fp rec;
	l_fp ci;
	int has_mac;
	int is_authentic;

	if (debug)
		printf("receive(%s)\n", stoa(&rbufp->recv_srcadr));
	/*
	 * Check to see if the packet basically looks like something
	 * intended for us.
	 */
	if (rbufp->recv_length == LEN_PKT_NOMAC)
		has_mac = 0;
	else if (rbufp->recv_length >= (int)LEN_PKT_NOMAC)
		has_mac = 1;
	else {
		if (debug)
			printf("receive: packet length %d\n",
			   rbufp->recv_length);
		return; 		/* funny length packet */
	}

	rpkt = &(rbufp->recv_pkt);
	if (PKT_VERSION(rpkt->li_vn_mode) < NTP_OLDVERSION ||
		PKT_VERSION(rpkt->li_vn_mode) > NTP_VERSION) {
		return;
	}

	if ((PKT_MODE(rpkt->li_vn_mode) != MODE_SERVER
		 && PKT_MODE(rpkt->li_vn_mode) != MODE_PASSIVE)
		|| rpkt->stratum >= STRATUM_UNSPEC) {
		if (debug)
			printf("receive: mode %d stratum %d\n",
			   PKT_MODE(rpkt->li_vn_mode), rpkt->stratum);
		return;
	}

	/*
	 * So far, so good.  See if this is from a server we know.
	 */
	server = findserver(&(rbufp->recv_srcadr));
	if (server == NULL) {
		if (debug)
			printf("receive: server not found\n");
		return;
	}

	/*
	 * Decode the org timestamp and make sure we're getting a response
	 * to our last request.
	 */
	NTOHL_FP(&rpkt->org, &org);
	if (!L_ISEQU(&org, &server->xmt)) {
		if (debug)
			printf("receive: pkt.org and peer.xmt differ\n");
		return;
	}

	/*
	 * Check out the authenticity if we're doing that.
	 */
	if (!sys_authenticate)
		is_authentic = 1;
	else {
		is_authentic = 0;

		if (debug > 3)
			printf("receive: rpkt keyid=%ld sys_authkey=%ld decrypt=%ld\n",
			   (long int)ntohl(rpkt->exten[0]), (long int)sys_authkey,
			   (long int)authdecrypt(sys_authkey, (u_int32 *)rpkt,
				LEN_PKT_NOMAC, (size_t)(rbufp->recv_length - LEN_PKT_NOMAC)));

		if (has_mac && ntohl(rpkt->exten[0]) == sys_authkey &&
			authdecrypt(sys_authkey, (u_int32 *)rpkt, LEN_PKT_NOMAC,
			(size_t)(rbufp->recv_length - LEN_PKT_NOMAC)))
			is_authentic = 1;
		if (debug)
			printf("receive: authentication %s\n",
			   is_authentic ? "passed" : "failed");
	}
	server->trust <<= 1;
	if (!is_authentic)
		server->trust |= 1;

	/*
	 * Check for a KoD (rate limiting) response, cease and decist.
	 */
	if (LEAP_NOTINSYNC == PKT_LEAP(rpkt->li_vn_mode) &&
	    STRATUM_PKT_UNSPEC == rpkt->stratum &&
	    !memcmp("RATE", &rpkt->refid, 4)) {
		msyslog(LOG_ERR, "%s rate limit response from server.",
			stoa(&rbufp->recv_srcadr));
		server->event_time = 0;
		complete_servers++;
		return;
	}

	/*
	 * Looks good.	Record info from the packet.
	 */
	server->leap = PKT_LEAP(rpkt->li_vn_mode);
	server->stratum = PKT_TO_STRATUM(rpkt->stratum);
	server->precision = rpkt->precision;
	server->rootdelay = ntohl(rpkt->rootdelay);
	server->rootdisp = ntohl(rpkt->rootdisp);
	server->refid = rpkt->refid;
	NTOHL_FP(&rpkt->reftime, &server->reftime);
	NTOHL_FP(&rpkt->rec, &rec);
	NTOHL_FP(&rpkt->xmt, &server->org);

	/*
	 * Make sure the server is at least somewhat sane. If not, try
	 * again.
	 */
	if (L_ISZERO(&rec) || !L_ISHIS(&server->org, &rec)) {
		server->event_time = current_time + sys_timeout;
		return;
	}

	/*
	 * Calculate the round trip delay (di) and the clock offset (ci).
	 * We use the equations (reordered from those in the spec):
	 *
	 * d = (t2 - t3) - (t1 - t0)
	 * c = ((t2 - t3) + (t1 - t0)) / 2
	 */
	t10 = server->org;		/* pkt.xmt == t1 */
	L_SUB(&t10, &rbufp->recv_time); /* recv_time == t0*/

	t23 = rec;			/* pkt.rec == t2 */
	L_SUB(&t23, &org);		/* pkt->org == t3 */

	/* now have (t2 - t3) and (t0 - t1).	Calculate (ci) and (di) */
	/*
	 * Calculate (ci) = ((t1 - t0) / 2) + ((t2 - t3) / 2)
	 * For large offsets this may prevent an overflow on '+'
	 */
	ci = t10;
	L_RSHIFT(&ci);
	tmp = t23;
	L_RSHIFT(&tmp);
	L_ADD(&ci, &tmp);

	/*
	 * Calculate di in t23 in full precision, then truncate
	 * to an s_fp.
	 */
	L_SUB(&t23, &t10);
	di = LFPTOFP(&t23);

	if (debug > 3)
		printf("offset: %s, delay %s\n", lfptoa(&ci, 6), fptoa(di, 5));

	di += (FP_SECOND >> (-(int)NTPDATE_PRECISION))
		+ (FP_SECOND >> (-(int)server->precision)) + NTP_MAXSKW;

	if (di <= 0) {		/* value still too raunchy to use? */
		L_CLR(&ci);
		di = 0;
	} else {
		di = max(di, NTP_MINDIST);
	}

	/*
	 * Shift this data in, then schedule another transmit.
	 */
	server_data(server, (s_fp) di, &ci, 0);

	if ((int)server->filter_nextpt >= sys_samples) {
		/*
		 * Got all the data we need.  Mark this guy
		 * completed and return.
		 */
		server->event_time = 0;
		complete_servers++;
		return;
	}

	server->event_time = current_time + sys_timeout;
}


/*
 * server_data - add a sample to the server's filter registers
 */
static void
server_data(
	register struct server *server,
	s_fp d,
	l_fp *c,
	u_fp e
	)
{
	u_short i;

	i = server->filter_nextpt;
	if (i < NTP_SHIFT) {
		server->filter_delay[i] = d;
		server->filter_offset[i] = *c;
		server->filter_soffset[i] = LFPTOFP(c);
		server->filter_error[i] = e;
		server->filter_nextpt = (u_short)(i + 1);
	}
}


/*
 * clock_filter - determine a server's delay, dispersion and offset
 */
static void
clock_filter(
	register struct server *server
	)
{
	register int i, j;
	int ord[NTP_SHIFT];

	INSIST((0 < sys_samples) && (sys_samples <= NTP_SHIFT));

	/*
	 * Sort indices into increasing delay order
	 */
	for (i = 0; i < sys_samples; i++)
		ord[i] = i;

	for (i = 0; i < (sys_samples-1); i++) {
		for (j = i+1; j < sys_samples; j++) {
			if (server->filter_delay[ord[j]] == 0)
				continue;
			if (server->filter_delay[ord[i]] == 0
				|| (server->filter_delay[ord[i]]
				> server->filter_delay[ord[j]])) {
				register int tmp;

				tmp = ord[i];
				ord[i] = ord[j];
				ord[j] = tmp;
			}
		}
	}

	/*
	 * Now compute the dispersion, and assign values to delay and
	 * offset.	If there are no samples in the register, delay and
	 * offset go to zero and dispersion is set to the maximum.
	 */
	if (server->filter_delay[ord[0]] == 0) {
		server->delay = 0;
		L_CLR(&server->offset);
		server->soffset = 0;
		server->dispersion = PEER_MAXDISP;
	} else {
		register s_fp d;

		server->delay = server->filter_delay[ord[0]];
		server->offset = server->filter_offset[ord[0]];
		server->soffset = LFPTOFP(&server->offset);
		server->dispersion = 0;
		for (i = 1; i < sys_samples; i++) {
			if (server->filter_delay[ord[i]] == 0)
				d = PEER_MAXDISP;
			else {
				d = server->filter_soffset[ord[i]]
					- server->filter_soffset[ord[0]];
				if (d < 0)
					d = -d;
				if (d > PEER_MAXDISP)
					d = PEER_MAXDISP;
			}
			/*
			 * XXX This *knows* PEER_FILTER is 1/2
			 */
			server->dispersion += (u_fp)(d) >> i;
		}
	}
	/*
	 * We're done
	 */
}


/*
 * clock_select - select the pick-of-the-litter clock from the samples
 *		  we've got.
 */
static struct server *
clock_select(void)
{
	struct server *server;
	u_int nlist;
	s_fp d;
	u_int count;
	u_int i;
	u_int j;
	u_int k;
	int n;
	s_fp local_threshold;
	struct server *server_list[NTP_MAXCLOCK];
	u_fp server_badness[NTP_MAXCLOCK];
	struct server *sys_server;

	/*
	 * This first chunk of code is supposed to go through all
	 * servers we know about to find the NTP_MAXLIST servers which
	 * are most likely to succeed. We run through the list
	 * doing the sanity checks and trying to insert anyone who
	 * looks okay. We are at all times aware that we should
	 * only keep samples from the top two strata and we only need
	 * NTP_MAXLIST of them.
	 */
	nlist = 0;	/* none yet */
	for (server = sys_servers; server != NULL; server = server->next_server) {
		if (server->stratum == 0) {
			if (debug)
				printf("%s: Server dropped: no data\n", ntoa(&server->srcadr));
			continue;	/* no data */
		}
		if (server->stratum > NTP_INFIN) {
			if (debug)
				printf("%s: Server dropped: strata too high\n", ntoa(&server->srcadr));
			continue;	/* stratum no good */
		}
		if (server->delay > NTP_MAXWGT) {
			if (debug)
				printf("%s: Server dropped: server too far away\n",
					ntoa(&server->srcadr));
			continue;	/* too far away */
		}
		if (server->leap == LEAP_NOTINSYNC) {
			if (debug)
				printf("%s: Server dropped: leap not in sync\n", ntoa(&server->srcadr));
			continue;	/* he's in trouble */
		}
		if (!L_ISHIS(&server->org, &server->reftime)) {
			if (debug)
				printf("%s: Server dropped: server is very broken\n",
				       ntoa(&server->srcadr));
			continue;	/* very broken host */
		}
		if ((server->org.l_ui - server->reftime.l_ui)
		    >= NTP_MAXAGE) {
			if (debug)
				printf("%s: Server dropped: server has gone too long without sync\n",
				       ntoa(&server->srcadr));
			continue;	/* too long without sync */
		}
		if (server->trust != 0) {
			if (debug)
				printf("%s: Server dropped: Server is untrusted\n",
				       ntoa(&server->srcadr));
			continue;
		}

		/*
		 * This one seems sane.  Find where he belongs
		 * on the list.
		 */
		d = server->dispersion + server->dispersion;
		for (i = 0; i < nlist; i++)
			if (server->stratum <= server_list[i]->stratum)
			break;
		for ( ; i < nlist; i++) {
			if (server->stratum < server_list[i]->stratum)
				break;
			if (d < (s_fp) server_badness[i])
				break;
		}

		/*
		 * If i points past the end of the list, this
		 * guy is a loser, else stick him in.
		 */
		if (i >= NTP_MAXLIST)
			continue;
		for (j = nlist; j > i; j--)
			if (j < NTP_MAXLIST) {
				server_list[j] = server_list[j-1];
				server_badness[j]
					= server_badness[j-1];
			}

		server_list[i] = server;
		server_badness[i] = d;
		if (nlist < NTP_MAXLIST)
			nlist++;
	}

	/*
	 * Got the five-or-less best.	 Cut the list where the number of
	 * strata exceeds two.
	 */
	count = 0;
	for (i = 1; i < nlist; i++)
		if (server_list[i]->stratum > server_list[i-1]->stratum) {
			count++;
			if (2 == count) {
				nlist = i;
				break;
			}
		}

	/*
	 * Whew!  What we should have by now is 0 to 5 candidates for
	 * the job of syncing us.  If we have none, we're out of luck.
	 * If we have one, he's a winner.  If we have more, do falseticker
	 * detection.
	 */

	if (0 == nlist)
		sys_server = NULL;
	else if (1 == nlist) {
		sys_server = server_list[0];
	} else {
		/*
		 * Re-sort by stratum, bdelay estimate quality and
		 * server.delay.
		 */
		for (i = 0; i < nlist-1; i++)
			for (j = i+1; j < nlist; j++) {
				if (server_list[i]->stratum <
				    server_list[j]->stratum)
					/* already sorted by stratum */
					break;
				if (server_list[i]->delay <
				    server_list[j]->delay)
					continue;
				server = server_list[i];
				server_list[i] = server_list[j];
				server_list[j] = server;
			}

		/*
		 * Calculate the fixed part of the dispersion limit
		 */
		local_threshold = (FP_SECOND >> (-(int)NTPDATE_PRECISION))
			+ NTP_MAXSKW;

		/*
		 * Now drop samples until we're down to one.
		 */
		while (nlist > 1) {
			for (k = 0; k < nlist; k++) {
				server_badness[k] = 0;
				for (j = 0; j < nlist; j++) {
					if (j == k) /* with self? */
						continue;
					d = server_list[j]->soffset -
					    server_list[k]->soffset;
					if (d < 0)	/* abs value */
						d = -d;
					/*
					 * XXX This code *knows* that
					 * NTP_SELECT is 3/4
					 */
					for (i = 0; i < j; i++)
						d = (d>>1) + (d>>2);
					server_badness[k] += d;
				}
			}

			/*
			 * We now have an array of nlist badness
			 * coefficients.	Find the badest.  Find
			 * the minimum precision while we're at
			 * it.
			 */
			i = 0;
			n = server_list[0]->precision;;
			for (j = 1; j < nlist; j++) {
				if (server_badness[j] >= server_badness[i])
					i = j;
				if (n > server_list[j]->precision)
					n = server_list[j]->precision;
			}

			/*
			 * i is the index of the server with the worst
			 * dispersion.	If his dispersion is less than
			 * the threshold, stop now, else delete him and
			 * continue around again.
			 */
			if ( (s_fp) server_badness[i] < (local_threshold
							 + (FP_SECOND >> (-n))))
				break;
			for (j = i + 1; j < nlist; j++)
				server_list[j-1] = server_list[j];
			nlist--;
		}

		/*
		 * What remains is a list of less than 5 servers.  Take
		 * the best.
		 */
		sys_server = server_list[0];
	}

	/*
	 * That's it.  Return our server.
	 */
	return sys_server;
}


/*
 * clock_adjust - process what we've received, and adjust the time
 *		 if we got anything decent.
 */
static int
clock_adjust(void)
{
	register struct server *sp, *server;
	int dostep;

	for (sp = sys_servers; sp != NULL; sp = sp->next_server)
		clock_filter(sp);
	server = clock_select();

	if (debug || simple_query) {
		if (debug)
			printf ("\n");
		for (sp = sys_servers; sp != NULL; sp = sp->next_server)
			print_server(sp, stdout);
	}

	if (server == 0) {
		msyslog(LOG_ERR,
			"no server suitable for synchronization found");
		return(1);
	}

	if (always_step) {
		dostep = 1;
	} else if (never_step) {
		dostep = 0;
	} else {
		/* [Bug 3023] get absolute difference, avoiding signed
		 * integer overflow like hell.
		 */
		u_fp absoffset;
		if (server->soffset < 0)
			absoffset = 1u + (u_fp)(-(server->soffset + 1));
		else
			absoffset = (u_fp)server->soffset;
		dostep = (absoffset >= NTPDATE_THRESHOLD);
	}

	if (dostep) {
		if (simple_query || l_step_systime(&server->offset)){
			msyslog(LOG_NOTICE, "step time server %s offset %s sec",
				stoa(&server->srcadr),
				lfptoa(&server->offset, 6));
		}
	} else {
		if (simple_query || l_adj_systime(&server->offset)) {
			msyslog(LOG_NOTICE, "adjust time server %s offset %s sec",
				stoa(&server->srcadr),
				lfptoa(&server->offset, 6));
		}
	}
	return(0);
}


/*
 * is_unreachable - check to see if we have a route to given destination
 *		    (non-blocking).
 */
static int
is_reachable (sockaddr_u *dst)
{
	SOCKET sockfd;

	sockfd = socket(AF(dst), SOCK_DGRAM, 0);
	if (sockfd == -1) {
		return 0;
	}

	if (connect(sockfd, &dst->sa, SOCKLEN(dst))) {
		closesocket(sockfd);
		return 0;
	}
	closesocket(sockfd);
	return 1;
}



/* XXX ELIMINATE: merge BIG slew into adj_systime in lib/systime.c */
/*
 * addserver - determine a server's address and allocate a new structure
 *		for it.
 */
static void
addserver(
	char *serv
	)
{
	register struct server *server;
	/* Address infos structure to store result of getaddrinfo */
	struct addrinfo *addrResult, *ptr;
	/* Address infos structure to store hints for getaddrinfo */
	struct addrinfo hints;
	/* Error variable for getaddrinfo */
	int error;
	/* Service name */
	char service[5];
	sockaddr_u addr;

	strlcpy(service, "ntp", sizeof(service));

	/* Get host address. Looking for UDP datagram connection. */
	ZERO(hints);
	hints.ai_family = ai_fam_templ;
	hints.ai_socktype = SOCK_DGRAM;

#ifdef DEBUG
	if (debug)
		printf("Looking for host %s and service %s\n", serv, service);
#endif

	error = getaddrinfo(serv, service, &hints, &addrResult);
	if (error == EAI_SERVICE) {
		strlcpy(service, "123", sizeof(service));
		error = getaddrinfo(serv, service, &hints, &addrResult);
	}
	if (error != 0) {
		/* Conduct more refined error analysis */
		if (error == EAI_FAIL || error == EAI_AGAIN){
			/* Name server is unusable. Exit after failing on the
			   first server, in order to shorten the timeout caused
			   by waiting for resolution of several servers */
			fprintf(stderr, "Exiting, name server cannot be used: %s (%d)",
				gai_strerror(error), error);
			msyslog(LOG_ERR, "name server cannot be used: %s (%d)",
				gai_strerror(error), error);
			exit(1);
		}
		fprintf(stderr, "Error resolving %s: %s (%d)\n", serv,
			gai_strerror(error), error);
		msyslog(LOG_ERR, "Can't find host %s: %s (%d)", serv,
			gai_strerror(error), error);
		return;
	}
#ifdef DEBUG
	if (debug) {
		ZERO(addr);
		INSIST(addrResult->ai_addrlen <= sizeof(addr));
		memcpy(&addr, addrResult->ai_addr, addrResult->ai_addrlen);
		fprintf(stderr, "host found : %s\n", stohost(&addr));
	}
#endif

	/* We must get all returned server in case the first one fails */
	for (ptr = addrResult; ptr != NULL; ptr = ptr->ai_next) {
		ZERO(addr);
		INSIST(ptr->ai_addrlen <= sizeof(addr));
		memcpy(&addr, ptr->ai_addr, ptr->ai_addrlen);
		if (is_reachable(&addr)) {
			server = emalloc_zero(sizeof(*server));
			memcpy(&server->srcadr, ptr->ai_addr, ptr->ai_addrlen);
			server->event_time = ++sys_numservers;
			if (sys_servers == NULL)
				sys_servers = server;
			else {
				struct server *sp;

				for (sp = sys_servers; sp->next_server != NULL;
				     sp = sp->next_server)
					/* empty */;
				sp->next_server = server;
			}
		}
	}

	freeaddrinfo(addrResult);
}


/*
 * findserver - find a server in the list given its address
 * ***(For now it isn't totally AF-Independant, to check later..)
 */
static struct server *
findserver(
	sockaddr_u *addr
	)
{
	struct server *server;
	struct server *mc_server;

	mc_server = NULL;
	if (SRCPORT(addr) != NTP_PORT)
		return 0;

	for (server = sys_servers; server != NULL;
	     server = server->next_server) {
		if (SOCK_EQ(addr, &server->srcadr))
			return server;

		if (AF(addr) == AF(&server->srcadr)) {
			if (IS_MCAST(&server->srcadr))
				mc_server = server;
		}
	}

	if (mc_server != NULL) {

		struct server *sp;

		if (mc_server->event_time != 0) {
			mc_server->event_time = 0;
			complete_servers++;
		}

		server = emalloc_zero(sizeof(*server));

		server->srcadr = *addr;

		server->event_time = ++sys_numservers;

		for (sp = sys_servers; sp->next_server != NULL;
		     sp = sp->next_server)
			/* empty */;
		sp->next_server = server;
		transmit(server);
	}
	return NULL;
}


/*
 * timer - process a timer interrupt
 */
void
timer(void)
{
	struct server *server;

	/*
	 * Bump the current idea of the time
	 */
	current_time++;

	/*
	 * Search through the server list looking for guys
	 * who's event timers have expired.  Give these to
	 * the transmit routine.
	 */
	for (server = sys_servers; server != NULL;
	     server = server->next_server) {
		if (server->event_time != 0
		    && server->event_time <= current_time)
			transmit(server);
	}
}


/*
 * The code duplication in the following subroutine sucks, but
 * we need to appease ansi2knr.
 */

#ifndef SYS_WINNT
/*
 * alarming - record the occurance of an alarm interrupt
 */
static RETSIGTYPE
alarming(
	int sig
	)
{
	alarm_flag++;
}
#else	/* SYS_WINNT follows */
void CALLBACK
alarming(UINT uTimerID, UINT uMsg, DWORD dwUser, DWORD dw1, DWORD dw2)
{
	UNUSED_ARG(uTimerID); UNUSED_ARG(uMsg); UNUSED_ARG(dwUser);
	UNUSED_ARG(dw1); UNUSED_ARG(dw2);

	alarm_flag++;
}

static void
callTimeEndPeriod(void)
{
	timeEndPeriod( wTimerRes );
	wTimerRes = 0;
}
#endif /* SYS_WINNT */


/*
 * init_alarm - set up the timer interrupt
 */
static void
init_alarm(void)
{
#ifndef SYS_WINNT
# ifdef HAVE_TIMER_CREATE
	struct itimerspec its;
# else
	struct itimerval itv;
# endif
#else	/* SYS_WINNT follows */
	TIMECAPS tc;
	UINT wTimerID;
	HANDLE hToken;
	TOKEN_PRIVILEGES tkp;
	DWORD dwUser = 0;
#endif /* SYS_WINNT */

	alarm_flag = 0;

#ifndef SYS_WINNT
# ifdef HAVE_TIMER_CREATE
	alarm_flag = 0;
	/* this code was put in as setitimer() is non existant this us the
	 * POSIX "equivalents" setup - casey
	 */
	/* ntpdate_timerid is global - so we can kill timer later */
	if (timer_create (CLOCK_REALTIME, NULL, &ntpdate_timerid) ==
#  ifdef SYS_VXWORKS
		ERROR
#  else
		-1
#  endif
		)
	{
		fprintf (stderr, "init_alarm(): timer_create (...) FAILED\n");
		return;
	}

	/*	TIMER_HZ = (5)
	 * Set up the alarm interrupt.	The first comes 1/(2*TIMER_HZ)
	 * seconds from now and they continue on every 1/TIMER_HZ seconds.
	 */
	signal_no_reset(SIGALRM, alarming);
	its.it_interval.tv_sec = 0;
	its.it_value.tv_sec = 0;
	its.it_interval.tv_nsec = 1000000000/TIMER_HZ;
	its.it_value.tv_nsec = 1000000000/(TIMER_HZ<<1);
	timer_settime(ntpdate_timerid, 0 /* !TIMER_ABSTIME */, &its, NULL);
# else	/* !HAVE_TIMER_CREATE follows */
	/*
	 * Set up the alarm interrupt.	The first comes 1/(2*TIMER_HZ)
	 * seconds from now and they continue on every 1/TIMER_HZ seconds.
	 */
	signal_no_reset(SIGALRM, alarming);
	itv.it_interval.tv_sec = 0;
	itv.it_value.tv_sec = 0;
	itv.it_interval.tv_usec = 1000000/TIMER_HZ;
	itv.it_value.tv_usec = 1000000/(TIMER_HZ<<1);

	setitimer(ITIMER_REAL, &itv, NULL);
# endif	/* !HAVE_TIMER_CREATE */
#else	/* SYS_WINNT follows */
	_tzset();

	if (!simple_query && !debug) {
		/*
		 * Get privileges needed for fiddling with the clock
		 */

		/* get the current process token handle */
		if (!OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) {
			msyslog(LOG_ERR, "OpenProcessToken failed: %m");
			exit(1);
		}
		/* get the LUID for system-time privilege. */
		LookupPrivilegeValue(NULL, SE_SYSTEMTIME_NAME, &tkp.Privileges[0].Luid);
		tkp.PrivilegeCount = 1;		/* one privilege to set */
		tkp.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED;
		/* get set-time privilege for this process. */
		AdjustTokenPrivileges(hToken, FALSE, &tkp, 0,(PTOKEN_PRIVILEGES) NULL, 0);
		/* cannot test return value of AdjustTokenPrivileges. */
		if (GetLastError() != ERROR_SUCCESS)
			msyslog(LOG_ERR, "AdjustTokenPrivileges failed: %m");
	}

	/*
	 * Set up timer interrupts for every 2**EVENT_TIMEOUT seconds
	 * Under Win/NT, expiry of timer interval leads to invocation
	 * of a callback function (on a different thread) rather than
	 * generating an alarm signal
	 */

	/* determine max and min resolution supported */
	if(timeGetDevCaps(&tc, sizeof(TIMECAPS)) != TIMERR_NOERROR) {
		msyslog(LOG_ERR, "timeGetDevCaps failed: %m");
		exit(1);
	}
	wTimerRes = min(max(tc.wPeriodMin, TARGET_RESOLUTION), tc.wPeriodMax);
	/* establish the minimum timer resolution that we'll use */
	timeBeginPeriod(wTimerRes);
	atexit(callTimeEndPeriod);

	/* start the timer event */
	wTimerID = timeSetEvent(
		(UINT) (1000/TIMER_HZ),		/* Delay */
		wTimerRes,			/* Resolution */
		(LPTIMECALLBACK) alarming,	/* Callback function */
		(DWORD) dwUser,			/* User data */
		TIME_PERIODIC);			/* Event type (periodic) */
	if (wTimerID == 0) {
		msyslog(LOG_ERR, "timeSetEvent failed: %m");
		exit(1);
	}
#endif /* SYS_WINNT */
}




/*
 * We do asynchronous input using the SIGIO facility.  A number of
 * recvbuf buffers are preallocated for input.	In the signal
 * handler we poll to see if the socket is ready and read the
 * packets from it into the recvbuf's along with a time stamp and
 * an indication of the source host and the interface it was received
 * through.  This allows us to get as accurate receive time stamps
 * as possible independent of other processing going on.
 *
 * We allocate a number of recvbufs equal to the number of servers
 * plus 2.	This should be plenty.
 */


/*
 * init_io - initialize I/O data and open socket
 */
static void
init_io(void)
{
	struct addrinfo *res, *ressave;
	struct addrinfo hints;
	sockaddr_u addr;
	char service[5];
	int rc;
	int optval = 1;
	int check_ntp_port_in_use = !debug && !simple_query && !unpriv_port;

	/*
	 * Init buffer free list and stat counters
	 */
	init_recvbuff(sys_numservers + 2);

	/*
	 * Open the socket
	 */

	strlcpy(service, "ntp", sizeof(service));

	/*
	 * Init hints addrinfo structure
	 */
	ZERO(hints);
	hints.ai_family = ai_fam_templ;
	hints.ai_flags = AI_PASSIVE;
	hints.ai_socktype = SOCK_DGRAM;

	rc = getaddrinfo(NULL, service, &hints, &res);
	if (rc == EAI_SERVICE) {
		strlcpy(service, "123", sizeof(service));
		rc = getaddrinfo(NULL, service, &hints, &res);
	}
	if (rc != 0) {
		msyslog(LOG_ERR, "getaddrinfo() failed: %m");
		exit(1);
		/*NOTREACHED*/
	}

#ifdef SYS_WINNT
	if (check_ntp_port_in_use && ntp_port_inuse(AF_INET, NTP_PORT)){
		msyslog(LOG_ERR, "the NTP socket is in use, exiting: %m");
		exit(1);
	}
#endif

	/* Remember the address of the addrinfo structure chain */
	ressave = res;

	/*
	 * For each structure returned, open and bind socket
	 */
	for(nbsock = 0; (nbsock < MAX_AF) && res ; res = res->ai_next) {
	/* create a datagram (UDP) socket */
		fd[nbsock] = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
		if (fd[nbsock] == SOCKET_ERROR) {
#ifndef SYS_WINNT
		if (errno == EPROTONOSUPPORT || errno == EAFNOSUPPORT ||
		    errno == EPFNOSUPPORT)
#else
		int err = WSAGetLastError();
		if (err == WSAEPROTONOSUPPORT || err == WSAEAFNOSUPPORT ||
		    err == WSAEPFNOSUPPORT)
#endif
			continue;
		msyslog(LOG_ERR, "socket() failed: %m");
		exit(1);
		/*NOTREACHED*/
		}
		/* set socket to reuse address */
		if (setsockopt(fd[nbsock], SOL_SOCKET, SO_REUSEADDR, (void*) &optval, sizeof(optval)) < 0) {
				msyslog(LOG_ERR, "setsockopt() SO_REUSEADDR failed: %m");
				exit(1);
				/*NOTREACHED*/
		}
#ifdef IPV6_V6ONLY
		/* Restricts AF_INET6 socket to IPv6 communications (see RFC 2553bis-03) */
		if (res->ai_family == AF_INET6)
			if (setsockopt(fd[nbsock], IPPROTO_IPV6, IPV6_V6ONLY, (void*) &optval, sizeof(optval)) < 0) {
				msyslog(LOG_ERR, "setsockopt() IPV6_V6ONLY failed: %m");
		}
#endif

		/* Remember the socket family in fd_family structure */
		fd_family[nbsock] = res->ai_family;

		/*
		 * bind the socket to the NTP port
		 */
		if (check_ntp_port_in_use) {
			ZERO(addr);
			INSIST(res->ai_addrlen <= sizeof(addr));
			memcpy(&addr, res->ai_addr, res->ai_addrlen);
			rc = bind(fd[nbsock], &addr.sa, SOCKLEN(&addr));
			if (rc < 0) {
				if (EADDRINUSE == socket_errno())
					msyslog(LOG_ERR, "the NTP socket is in use, exiting");
				else
					msyslog(LOG_ERR, "bind() fails: %m");
				exit(1);
			}
		}

#ifdef HAVE_POLL_H
		fdmask[nbsock].fd = fd[nbsock];
		fdmask[nbsock].events = POLLIN;
#else
		FD_SET(fd[nbsock], &fdmask);
		if (maxfd < fd[nbsock]+1) {
			maxfd = fd[nbsock]+1;
		}
#endif

		/*
		 * set non-blocking,
		 */
#ifndef SYS_WINNT
# ifdef SYS_VXWORKS
		{
			int on = TRUE;

			if (ioctl(fd[nbsock],FIONBIO, &on) == ERROR) {
				msyslog(LOG_ERR, "ioctl(FIONBIO) fails: %m");
				exit(1);
			}
		}
# else /* not SYS_VXWORKS */
#  if defined(O_NONBLOCK)
		if (fcntl(fd[nbsock], F_SETFL, O_NONBLOCK) < 0) {
			msyslog(LOG_ERR, "fcntl(FNDELAY|FASYNC) fails: %m");
			exit(1);
			/*NOTREACHED*/
		}
#  else /* not O_NONBLOCK */
#	if defined(FNDELAY)
		if (fcntl(fd[nbsock], F_SETFL, FNDELAY) < 0) {
			msyslog(LOG_ERR, "fcntl(FNDELAY|FASYNC) fails: %m");
			exit(1);
			/*NOTREACHED*/
		}
#	else /* FNDELAY */
#	 include "Bletch: Need non blocking I/O"
#	endif /* FNDELAY */
#  endif /* not O_NONBLOCK */
# endif /* SYS_VXWORKS */
#else /* SYS_WINNT */
		if (ioctlsocket(fd[nbsock], FIONBIO, (u_long *) &on) == SOCKET_ERROR) {
			msyslog(LOG_ERR, "ioctlsocket(FIONBIO) fails: %m");
			exit(1);
		}
#endif /* SYS_WINNT */
		nbsock++;
	}
	freeaddrinfo(ressave);
}

/*
 * sendpkt - send a packet to the specified destination
 */
static void
sendpkt(
	sockaddr_u *dest,
	struct pkt *pkt,
	int len
	)
{
	int i;
	int cc;
	SOCKET sock = INVALID_SOCKET;

#ifdef SYS_WINNT
	DWORD err;
#endif /* SYS_WINNT */

	/* Find a local family compatible socket to send ntp packet to ntp server */
	for(i = 0; (i < MAX_AF); i++) {
		if(AF(dest) == fd_family[i]) {
			sock = fd[i];
		break;
		}
	}

	if (INVALID_SOCKET == sock) {
		msyslog(LOG_ERR, "cannot find family compatible socket to send ntp packet");
		exit(1);
		/*NOTREACHED*/
	}

	cc = sendto(sock, (char *)pkt, len, 0, (struct sockaddr *)dest,
			SOCKLEN(dest));

	if (SOCKET_ERROR == cc) {
#ifndef SYS_WINNT
		if (errno != EWOULDBLOCK && errno != ENOBUFS)
#else
		err = WSAGetLastError();
		if (err != WSAEWOULDBLOCK && err != WSAENOBUFS)
#endif /* SYS_WINNT */
			msyslog(LOG_ERR, "sendto(%s): %m", stohost(dest));
	}
}


/*
 * input_handler - receive packets asynchronously
 */
void
input_handler(void)
{
	register int n;
	register struct recvbuf *rb;
	struct sock_timeval tvzero;
	GETSOCKNAME_SOCKLEN_TYPE fromlen;
	l_fp ts;
	int i;
#ifdef HAVE_POLL_H
	struct pollfd fds[MAX_AF];
#else
	fd_set fds;
#endif
	SOCKET fdc = 0;

	/*
	 * Do a poll to see if we have data
	 */
	for (;;) {
		tvzero.tv_sec = tvzero.tv_usec = 0;
#ifdef HAVE_POLL_H
		memcpy(fds, fdmask, sizeof(fdmask));
		n = poll(fds, (unsigned int)nbsock, tvzero.tv_sec * 1000);

		/*
		 * Determine which socket received data
		 */

		for(i=0; i < nbsock; i++) {
			if(fds[i].revents & POLLIN) {
				fdc = fd[i];
				break;
			}
		}

#else
		fds = fdmask;
		n = select(maxfd, &fds, NULL, NULL, &tvzero);

		/*
		 * Determine which socket received data
		 */

		for(i=0; i < nbsock; i++) {
			if(FD_ISSET(fd[i], &fds)) {
				 fdc = fd[i];
				 break;
			}
		}

#endif

		/*
		 * If nothing to do, just return.  If an error occurred,
		 * complain and return.  If we've got some, freeze a
		 * timestamp.
		 */
		if (n == 0)
			return;
		else if (n == -1) {
			if (errno != EINTR)
				msyslog(LOG_ERR,
#ifdef HAVE_POLL_H
					"poll() error: %m"
#else
					"select() error: %m"
#endif
					);
			return;
		}
		get_systime(&ts);

		/*
		 * Get a buffer and read the frame.  If we
		 * haven't got a buffer, or this is received
		 * on the wild card socket, just dump the packet.
		 */
		if (initializing || free_recvbuffs() == 0) {
			char buf[100];


#ifndef SYS_WINNT
			(void) read(fdc, buf, sizeof buf);
#else
			/* NT's _read does not operate on nonblocking sockets
			 * either recvfrom or ReadFile() has to be used here.
			 * ReadFile is used in [ntpd]ntp_intres() and ntpdc,
			 * just to be different use recvfrom() here
			 */
			recvfrom(fdc, buf, sizeof(buf), 0, (struct sockaddr *)0, NULL);
#endif /* SYS_WINNT */
			continue;
		}

		rb = get_free_recv_buffer();

		fromlen = sizeof(rb->recv_srcadr);
		rb->recv_length = recvfrom(fdc, (char *)&rb->recv_pkt,
		   sizeof(rb->recv_pkt), 0,
		   (struct sockaddr *)&rb->recv_srcadr, &fromlen);
		if (rb->recv_length == -1) {
			freerecvbuf(rb);
			continue;
		}

		/*
		 * Got one.  Mark how and when it got here,
		 * put it on the full list.
		 */
		rb->recv_time = ts;
		add_full_recv_buffer(rb);
	}
}


/*
 * adj_systime - do a big long slew of the system time
 */
static int
l_adj_systime(
	l_fp *ts
	)
{
	struct timeval adjtv, oadjtv;
	int isneg = 0;
	l_fp offset;
#ifndef STEP_SLEW
	l_fp overshoot;
#endif

	/*
	 * Take the absolute value of the offset
	 */
	offset = *ts;
	if (L_ISNEG(&offset)) {
		isneg = 1;
		L_NEG(&offset);
	}

#ifndef STEP_SLEW
	/*
	 * Calculate the overshoot.  XXX N.B. This code *knows*
	 * ADJ_OVERSHOOT is 1/2.
	 */
	overshoot = offset;
	L_RSHIFTU(&overshoot);
	if (overshoot.l_ui != 0 || (overshoot.l_uf > ADJ_MAXOVERSHOOT)) {
		overshoot.l_ui = 0;
		overshoot.l_uf = ADJ_MAXOVERSHOOT;
	}
	L_ADD(&offset, &overshoot);
#endif
	TSTOTV(&offset, &adjtv);

	if (isneg) {
		adjtv.tv_sec = -adjtv.tv_sec;
		adjtv.tv_usec = -adjtv.tv_usec;
	}

	if (!debug && (adjtv.tv_usec != 0)) {
		/* A time correction needs to be applied. */
#if !defined SYS_WINNT && !defined SYS_CYGWIN32
		/* Slew the time on systems that support this. */
		if (adjtime(&adjtv, &oadjtv) < 0) {
			msyslog(LOG_ERR, "Can't adjust the time of day: %m");
			exit(1);
		}
#else	/* SYS_WINNT or SYS_CYGWIN32 is defined */
		/*
		 * The NT SetSystemTimeAdjustment() call achieves slewing by
		 * changing the clock frequency. This means that we cannot specify
		 * it to slew the clock by a definite amount and then stop like
		 * the Unix adjtime() routine. We can technically adjust the clock
		 * frequency, have ntpdate sleep for a while, and then wake
		 * up and reset the clock frequency, but this might cause some
		 * grief if the user attempts to run ntpd immediately after
		 * ntpdate and the socket is in use.
		 */
		printf("\nSlewing the system time is not supported on Windows. Use the -b option to step the time.\n");
#endif	/* defined SYS_WINNT || defined SYS_CYGWIN32 */
	}
	return 1;
}


/*
 * This fuction is not the same as lib/systime step_systime!!!
 */
static int
l_step_systime(
	l_fp *ts
	)
{
	double dtemp;

#ifdef SLEWALWAYS
#ifdef STEP_SLEW
	l_fp ftmp;
	int isneg;
	int n;

	if (debug)
		return 1;

	/*
	 * Take the absolute value of the offset
	 */
	ftmp = *ts;

	if (L_ISNEG(&ftmp)) {
		L_NEG(&ftmp);
		isneg = 1;
	} else
		isneg = 0;

	if (ftmp.l_ui >= 3) {		/* Step it and slew - we might win */
		LFPTOD(ts, dtemp);
		n = step_systime(dtemp);
		if (n == 0)
			return 0;
		if (isneg)		/* WTF! */
			ts->l_ui = ~0;
		else
			ts->l_ui = ~0;
	}
	/*
	 * Just add adjustment into the current offset.  The update
	 * routine will take care of bringing the system clock into
	 * line.
	 */
#endif
	if (debug)
		return 1;
#ifdef FORCE_NTPDATE_STEP
	LFPTOD(ts, dtemp);
	return step_systime(dtemp);
#else
	l_adj_systime(ts);
	return 1;
#endif
#else /* SLEWALWAYS */
	if (debug)
		return 1;
	LFPTOD(ts, dtemp);
	return step_systime(dtemp);
#endif	/* SLEWALWAYS */
}


/* XXX ELIMINATE print_server similar in ntptrace.c, ntpdate.c */
/*
 * print_server - print detail information for a server
 */
static void
print_server(
	register struct server *pp,
	FILE *fp
	)
{
	register int i;
	char junk[5];
	const char *str;

	if (pp->stratum == 0)		/* Nothing received => nothing to print */
		return;

	if (!debug) {
		(void) fprintf(fp, "server %s, stratum %d, offset %s, delay %s\n",
				   stoa(&pp->srcadr), pp->stratum,
				   lfptoa(&pp->offset, 6), fptoa((s_fp)pp->delay, 5));
		return;
	}

	(void) fprintf(fp, "server %s, port %d\n",
			   stoa(&pp->srcadr), ntohs(((struct sockaddr_in*)&(pp->srcadr))->sin_port));

	(void) fprintf(fp, "stratum %d, precision %d, leap %c%c, trust %03o\n",
			   pp->stratum, pp->precision,
			   pp->leap & 0x2 ? '1' : '0',
			   pp->leap & 0x1 ? '1' : '0',
			   pp->trust);

	if (REFID_ISTEXT(pp->stratum)) {
		str = (char *) &pp->refid;
		for (i=0; i<4 && str[i]; i++) {
			junk[i] = (isprint(str[i]) ? str[i] : '.');
		}
		junk[i] = 0; // force terminating 0
		str = junk;
	} else {
		str = numtoa(pp->refid);
	}
	(void) fprintf(fp,
			"refid [%s], root delay %s, root dispersion %s\n",
			str, fptoa((s_fp)pp->rootdelay, 6),
			ufptoa(pp->rootdisp, 6));

	if (pp->xmtcnt != pp->filter_nextpt)
		(void) fprintf(fp, "transmitted %d, in filter %d\n",
			   pp->xmtcnt, pp->filter_nextpt);

	(void) fprintf(fp, "reference time:      %s\n",
			   prettydate(&pp->reftime));
	(void) fprintf(fp, "originate timestamp: %s\n",
			   prettydate(&pp->org));
	(void) fprintf(fp, "transmit timestamp:  %s\n",
			   prettydate(&pp->xmt));

	if (sys_samples > 1) {
		(void) fprintf(fp, "filter delay: ");
		for (i = 0; i < NTP_SHIFT; i++) {
			if (i == (NTP_SHIFT>>1))
				(void) fprintf(fp, "\n              ");
			(void) fprintf(fp, " %-10.10s", 
				(i<sys_samples ? fptoa(pp->filter_delay[i], 5) : "----"));
		}
		(void) fprintf(fp, "\n");

		(void) fprintf(fp, "filter offset:");
		for (i = 0; i < PEER_SHIFT; i++) {
			if (i == (PEER_SHIFT>>1))
				(void) fprintf(fp, "\n              ");
			(void) fprintf(fp, " %-10.10s", 
				(i<sys_samples ? lfptoa(&pp->filter_offset[i], 6): "----"));
		}
		(void) fprintf(fp, "\n");
	}

	(void) fprintf(fp, "delay %s, dispersion %s, ",
			   fptoa((s_fp)pp->delay, 5), ufptoa(pp->dispersion, 5));

	(void) fprintf(fp, "offset %s\n\n",
			   lfptoa(&pp->offset, 6));
}


#ifdef HAVE_NETINFO
static ni_namelist *
getnetinfoservers(void)
{
	ni_status status;
	void *domain;
	ni_id confdir;
	ni_namelist *namelist = emalloc(sizeof(ni_namelist));

	/* Find a time server in NetInfo */
	if ((status = ni_open(NULL, ".", &domain)) != NI_OK) return NULL;

	while (status = ni_pathsearch(domain, &confdir, NETINFO_CONFIG_DIR) == NI_NODIR) {
		void *next_domain;
		if (ni_open(domain, "..", &next_domain) != NI_OK) break;
		ni_free(domain);
		domain = next_domain;
	}
	if (status != NI_OK) return NULL;

	NI_INIT(namelist);
	if (ni_lookupprop(domain, &confdir, "server", namelist) != NI_OK) {
		ni_namelist_free(namelist);
		free(namelist);
		return NULL;
	}

	return(namelist);
}
#endif

#ifdef SYS_WINNT
isc_boolean_t ntp_port_inuse(int af, u_short port)
{
	/*
	 * Check if NTP socket is already in use on this system
	 * This is only for Windows Systems, as they tend not to fail on the real bind() below
	 */

	SOCKET checksocket;
	struct sockaddr_in checkservice;
	checksocket = socket(af, SOCK_DGRAM, 0);
	if (checksocket == INVALID_SOCKET) {
		return (ISC_TRUE);
	}

	checkservice.sin_family = (short) AF_INET;
	checkservice.sin_addr.s_addr = INADDR_LOOPBACK;
	checkservice.sin_port = htons(port);

	if (bind(checksocket, (struct sockaddr *)&checkservice,
		sizeof(checkservice)) == SOCKET_ERROR) {
		if ( WSAGetLastError() == WSAEADDRINUSE ){
			closesocket(checksocket);
			return (ISC_TRUE);
		}
	}
	closesocket(checksocket);
	return (ISC_FALSE);
}
#endif