summaryrefslogtreecommitdiff
path: root/source3/lib/util_sock.c
blob: 3fd0cc4ad31c83a0fe94ffecc9e2bbe94302b6fc (plain)
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
/*
   Unix SMB/CIFS implementation.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Tim Potter      2000-2001
   Copyright (C) Jeremy Allison  1992-2007

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"

/*******************************************************************
 Map a text hostname or IP address (IPv4 or IPv6) into a
 struct sockaddr_storage.
******************************************************************/

bool interpret_string_addr(struct sockaddr_storage *pss,
		const char *str,
		int flags)
{
	struct addrinfo *res = NULL;
#if defined(HAVE_IPV6)
	char addr[INET6_ADDRSTRLEN];
	unsigned int scope_id = 0;

	if (strchr_m(str, ':')) {
		char *p = strchr_m(str, '%');

		/*
		 * Cope with link-local.
		 * This is IP:v6:addr%ifname.
		 */

		if (p && (p > str) && ((scope_id = if_nametoindex(p+1)) != 0)) {
			strlcpy(addr, str,
				MIN(PTR_DIFF(p,str)+1,
					sizeof(addr)));
			str = addr;
		}
	}
#endif

	zero_sockaddr(pss);

	if (!interpret_string_addr_internal(&res, str, flags|AI_ADDRCONFIG)) {
		return false;
	}
	if (!res) {
		return false;
	}
	/* Copy the first sockaddr. */
	memcpy(pss, res->ai_addr, res->ai_addrlen);

#if defined(HAVE_IPV6)
	if (pss->ss_family == AF_INET6 && scope_id) {
		struct sockaddr_in6 *ps6 = (struct sockaddr_in6 *)pss;
		if (IN6_IS_ADDR_LINKLOCAL(&ps6->sin6_addr) &&
				ps6->sin6_scope_id == 0) {
			ps6->sin6_scope_id = scope_id;
		}
	}
#endif

	freeaddrinfo(res);
	return true;
}

/*******************************************************************
 Set an address to INADDR_ANY.
******************************************************************/

void zero_sockaddr(struct sockaddr_storage *pss)
{
	memset(pss, '\0', sizeof(*pss));
	/* Ensure we're at least a valid sockaddr-storage. */
	pss->ss_family = AF_INET;
}

/****************************************************************************
 Get a port number in host byte order from a sockaddr_storage.
****************************************************************************/

uint16_t get_sockaddr_port(const struct sockaddr_storage *pss)
{
	uint16_t port = 0;

	if (pss->ss_family != AF_INET) {
#if defined(HAVE_IPV6)
		/* IPv6 */
		const struct sockaddr_in6 *sa6 =
			(const struct sockaddr_in6 *)pss;
		port = ntohs(sa6->sin6_port);
#endif
	} else {
		const struct sockaddr_in *sa =
			(const struct sockaddr_in *)pss;
		port = ntohs(sa->sin_port);
	}
	return port;
}

/****************************************************************************
 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/

static char *print_sockaddr_len(char *dest,
			size_t destlen,
			const struct sockaddr *psa,
			socklen_t psalen)
{
	if (destlen > 0) {
		dest[0] = '\0';
	}
	(void)sys_getnameinfo(psa,
			psalen,
			dest, destlen,
			NULL, 0,
			NI_NUMERICHOST);
	return dest;
}

/****************************************************************************
 Print out an IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/

char *print_sockaddr(char *dest,
			size_t destlen,
			const struct sockaddr_storage *psa)
{
	return print_sockaddr_len(dest, destlen, (struct sockaddr *)psa,
			sizeof(struct sockaddr_storage));
}

/****************************************************************************
 Print out a canonical IPv4 or IPv6 address from a struct sockaddr_storage.
****************************************************************************/

char *print_canonical_sockaddr(TALLOC_CTX *ctx,
			const struct sockaddr_storage *pss)
{
	char addr[INET6_ADDRSTRLEN];
	char *dest = NULL;
	int ret;

	/* Linux getnameinfo() man pages says port is unitialized if
	   service name is NULL. */

	ret = sys_getnameinfo((const struct sockaddr *)pss,
			sizeof(struct sockaddr_storage),
			addr, sizeof(addr),
			NULL, 0,
			NI_NUMERICHOST);
	if (ret != 0) {
		return NULL;
	}

	if (pss->ss_family != AF_INET) {
#if defined(HAVE_IPV6)
		dest = talloc_asprintf(ctx, "[%s]", addr);
#else
		return NULL;
#endif
	} else {
		dest = talloc_asprintf(ctx, "%s", addr);
	}
	
	return dest;
}

/****************************************************************************
 Return the string of an IP address (IPv4 or IPv6).
****************************************************************************/

static const char *get_socket_addr(int fd, char *addr_buf, size_t addr_len)
{
	struct sockaddr_storage sa;
	socklen_t length = sizeof(sa);

	/* Ok, returning a hard coded IPv4 address
 	 * is bogus, but it's just as bogus as a
 	 * zero IPv6 address. No good choice here.
 	 */

	strlcpy(addr_buf, "0.0.0.0", addr_len);

	if (fd == -1) {
		return addr_buf;
	}

	if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
		DEBUG(0,("getsockname failed. Error was %s\n",
			strerror(errno) ));
		return addr_buf;
	}

	return print_sockaddr_len(addr_buf, addr_len, (struct sockaddr *)&sa, length);
}

/****************************************************************************
 Return the port number we've bound to on a socket.
****************************************************************************/

int get_socket_port(int fd)
{
	struct sockaddr_storage sa;
	socklen_t length = sizeof(sa);

	if (fd == -1) {
		return -1;
	}

	if (getsockname(fd, (struct sockaddr *)&sa, &length) < 0) {
		DEBUG(0,("getpeername failed. Error was %s\n",
			strerror(errno) ));
		return -1;
	}

#if defined(HAVE_IPV6)
	if (sa.ss_family == AF_INET6) {
		return ntohs(((struct sockaddr_in6 *)&sa)->sin6_port);
	}
#endif
	if (sa.ss_family == AF_INET) {
		return ntohs(((struct sockaddr_in *)&sa)->sin_port);
	}
	return -1;
}

const char *client_name(int fd)
{
	return get_peer_name(fd,false);
}

const char *client_addr(int fd, char *addr, size_t addrlen)
{
	return get_peer_addr(fd,addr,addrlen);
}

const char *client_socket_addr(int fd, char *addr, size_t addr_len)
{
	return get_socket_addr(fd, addr, addr_len);
}

#if 0
/* Not currently used. JRA. */
int client_socket_port(int fd)
{
	return get_socket_port(fd);
}
#endif

/****************************************************************************
 Accessor functions to make thread-safe code easier later...
****************************************************************************/

void set_smb_read_error(enum smb_read_errors *pre,
			enum smb_read_errors newerr)
{
	if (pre) {
		*pre = newerr;
	}
}

void cond_set_smb_read_error(enum smb_read_errors *pre,
			enum smb_read_errors newerr)
{
	if (pre && *pre == SMB_READ_OK) {
		*pre = newerr;
	}
}

/****************************************************************************
 Determine if a file descriptor is in fact a socket.
****************************************************************************/

bool is_a_socket(int fd)
{
	int v;
	socklen_t l;
	l = sizeof(int);
	return(getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0);
}

enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON};

typedef struct smb_socket_option {
	const char *name;
	int level;
	int option;
	int value;
	int opttype;
} smb_socket_option;

static const smb_socket_option socket_options[] = {
  {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL},
  {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL},
  {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL},
#ifdef TCP_NODELAY
  {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL},
#endif
#ifdef TCP_KEEPCNT
  {"TCP_KEEPCNT", IPPROTO_TCP, TCP_KEEPCNT, 0, OPT_INT},
#endif
#ifdef TCP_KEEPIDLE
  {"TCP_KEEPIDLE", IPPROTO_TCP, TCP_KEEPIDLE, 0, OPT_INT},
#endif
#ifdef TCP_KEEPINTVL
  {"TCP_KEEPINTVL", IPPROTO_TCP, TCP_KEEPINTVL, 0, OPT_INT},
#endif
#ifdef IPTOS_LOWDELAY
  {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON},
#endif
#ifdef IPTOS_THROUGHPUT
  {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON},
#endif
#ifdef SO_REUSEPORT
  {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL},
#endif
#ifdef SO_SNDBUF
  {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT},
#endif
#ifdef SO_RCVBUF
  {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT},
#endif
#ifdef SO_SNDLOWAT
  {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT},
#endif
#ifdef SO_RCVLOWAT
  {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT},
#endif
#ifdef SO_SNDTIMEO
  {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT},
#endif
#ifdef SO_RCVTIMEO
  {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT},
#endif
#ifdef TCP_FASTACK
  {"TCP_FASTACK", IPPROTO_TCP, TCP_FASTACK, 0, OPT_INT},
#endif
  {NULL,0,0,0,0}};

/****************************************************************************
 Print socket options.
****************************************************************************/

static void print_socket_options(int s)
{
	int value;
	socklen_t vlen = 4;
	const smb_socket_option *p = &socket_options[0];

	/* wrapped in if statement to prevent streams
	 * leak in SCO Openserver 5.0 */
	/* reported on samba-technical  --jerry */
	if ( DEBUGLEVEL >= 5 ) {
		DEBUG(5,("Socket options:\n"));
		for (; p->name != NULL; p++) {
			if (getsockopt(s, p->level, p->option,
						(void *)&value, &vlen) == -1) {
				DEBUGADD(5,("\tCould not test socket option %s.\n",
							p->name));
			} else {
				DEBUGADD(5,("\t%s = %d\n",
							p->name,value));
			}
		}
	}
 }

/****************************************************************************
 Set user socket options.
****************************************************************************/

void set_socket_options(int fd, const char *options)
{
	TALLOC_CTX *ctx = talloc_stackframe();
	char *tok;

	while (next_token_talloc(ctx, &options, &tok," \t,")) {
		int ret=0,i;
		int value = 1;
		char *p;
		bool got_value = false;

		if ((p = strchr_m(tok,'='))) {
			*p = 0;
			value = atoi(p+1);
			got_value = true;
		}

		for (i=0;socket_options[i].name;i++)
			if (strequal(socket_options[i].name,tok))
				break;

		if (!socket_options[i].name) {
			DEBUG(0,("Unknown socket option %s\n",tok));
			continue;
		}

		switch (socket_options[i].opttype) {
		case OPT_BOOL:
		case OPT_INT:
			ret = setsockopt(fd,socket_options[i].level,
					socket_options[i].option,
					(char *)&value,sizeof(int));
			break;

		case OPT_ON:
			if (got_value)
				DEBUG(0,("syntax error - %s "
					"does not take a value\n",tok));

			{
				int on = socket_options[i].value;
				ret = setsockopt(fd,socket_options[i].level,
					socket_options[i].option,
					(char *)&on,sizeof(int));
			}
			break;
		}

		if (ret != 0) {
			/* be aware that some systems like Solaris return
			 * EINVAL to a setsockopt() call when the client
			 * sent a RST previously - no need to worry */
			DEBUG(2,("Failed to set socket option %s (Error %s)\n",
				tok, strerror(errno) ));
		}
	}

	TALLOC_FREE(ctx);
	print_socket_options(fd);
}

/****************************************************************************
 Read from a socket.
****************************************************************************/

ssize_t read_udp_v4_socket(int fd,
			char *buf,
			size_t len,
			struct sockaddr_storage *psa)
{
	ssize_t ret;
	socklen_t socklen = sizeof(*psa);
	struct sockaddr_in *si = (struct sockaddr_in *)psa;

	memset((char *)psa,'\0',socklen);

	ret = (ssize_t)sys_recvfrom(fd,buf,len,0,
			(struct sockaddr *)psa,&socklen);
	if (ret <= 0) {
		/* Don't print a low debug error for a non-blocking socket. */
		if (errno == EAGAIN) {
			DEBUG(10,("read_udp_v4_socket: returned EAGAIN\n"));
		} else {
			DEBUG(2,("read_udp_v4_socket: failed. errno=%s\n",
				strerror(errno)));
		}
		return 0;
	}

	if (psa->ss_family != AF_INET) {
		DEBUG(2,("read_udp_v4_socket: invalid address family %d "
			"(not IPv4)\n", (int)psa->ss_family));
		return 0;
	}

	DEBUG(10,("read_udp_v4_socket: ip %s port %d read: %lu\n",
			inet_ntoa(si->sin_addr),
			si->sin_port,
			(unsigned long)ret));

	return ret;
}

/****************************************************************************
 Read data from a socket with a timout in msec.
 mincount = if timeout, minimum to read before returning
 maxcount = number to be read.
 time_out = timeout in milliseconds
****************************************************************************/

NTSTATUS read_socket_with_timeout(int fd, char *buf,
				  size_t mincnt, size_t maxcnt,
				  unsigned int time_out,
				  size_t *size_ret)
{
	fd_set fds;
	int selrtn;
	ssize_t readret;
	size_t nread = 0;
	struct timeval timeout;
	char addr[INET6_ADDRSTRLEN];

	/* just checking .... */
	if (maxcnt <= 0)
		return NT_STATUS_OK;

	/* Blocking read */
	if (time_out == 0) {
		if (mincnt == 0) {
			mincnt = maxcnt;
		}

		while (nread < mincnt) {
			readret = sys_recv(fd, buf + nread, maxcnt - nread, 0);

			if (readret == 0) {
				DEBUG(5,("read_socket_with_timeout: "
					"blocking read. EOF from client.\n"));
				return NT_STATUS_END_OF_FILE;
			}

			if (readret == -1) {
				if (fd == get_client_fd()) {
					/* Try and give an error message
					 * saying what client failed. */
					DEBUG(0,("read_socket_with_timeout: "
						"client %s read error = %s.\n",
						get_peer_addr(fd,addr,sizeof(addr)),
						strerror(errno) ));
				} else {
					DEBUG(0,("read_socket_with_timeout: "
						"read error = %s.\n",
						strerror(errno) ));
				}
				return map_nt_error_from_unix(errno);
			}
			nread += readret;
		}
		goto done;
	}

	/* Most difficult - timeout read */
	/* If this is ever called on a disk file and
	   mincnt is greater then the filesize then
	   system performance will suffer severely as
	   select always returns true on disk files */

	/* Set initial timeout */
	timeout.tv_sec = (time_t)(time_out / 1000);
	timeout.tv_usec = (long)(1000 * (time_out % 1000));

	for (nread=0; nread < mincnt; ) {
		FD_ZERO(&fds);
		FD_SET(fd,&fds);

		selrtn = sys_select_intr(fd+1,&fds,NULL,NULL,&timeout);

		/* Check if error */
		if (selrtn == -1) {
			/* something is wrong. Maybe the socket is dead? */
			if (fd == get_client_fd()) {
				/* Try and give an error message saying
				 * what client failed. */
				DEBUG(0,("read_socket_with_timeout: timeout "
				"read for client %s. select error = %s.\n",
				get_peer_addr(fd,addr,sizeof(addr)),
				strerror(errno) ));
			} else {
				DEBUG(0,("read_socket_with_timeout: timeout "
				"read. select error = %s.\n",
				strerror(errno) ));
			}
			return map_nt_error_from_unix(errno);
		}

		/* Did we timeout ? */
		if (selrtn == 0) {
			DEBUG(10,("read_socket_with_timeout: timeout read. "
				"select timed out.\n"));
			return NT_STATUS_IO_TIMEOUT;
		}

		readret = sys_recv(fd, buf+nread, maxcnt-nread, 0);

		if (readret == 0) {
			/* we got EOF on the file descriptor */
			DEBUG(5,("read_socket_with_timeout: timeout read. "
				"EOF from client.\n"));
			return NT_STATUS_END_OF_FILE;
		}

		if (readret == -1) {
			/* the descriptor is probably dead */
			if (fd == get_client_fd()) {
				/* Try and give an error message
				 * saying what client failed. */
				DEBUG(0,("read_socket_with_timeout: timeout "
					"read to client %s. read error = %s.\n",
					get_peer_addr(fd,addr,sizeof(addr)),
					strerror(errno) ));
			} else {
				DEBUG(0,("read_socket_with_timeout: timeout "
					"read. read error = %s.\n",
					strerror(errno) ));
			}
			return map_nt_error_from_unix(errno);
		}

		nread += readret;
	}

 done:
	/* Return the number we got */
	if (size_ret) {
		*size_ret = nread;
	}
	return NT_STATUS_OK;
}

/****************************************************************************
 Read data from the client, reading exactly N bytes.
****************************************************************************/

NTSTATUS read_data(int fd, char *buffer, size_t N)
{
	return read_socket_with_timeout(fd, buffer, N, N, 0, NULL);
}

/****************************************************************************
 Write all data from an iov array
****************************************************************************/

ssize_t write_data_iov(int fd, const struct iovec *orig_iov, int iovcnt)
{
	int i;
	size_t to_send;
	ssize_t thistime;
	size_t sent;
	struct iovec *iov_copy, *iov;

	to_send = 0;
	for (i=0; i<iovcnt; i++) {
		to_send += orig_iov[i].iov_len;
	}

	thistime = sys_writev(fd, orig_iov, iovcnt);
	if ((thistime <= 0) || (thistime == to_send)) {
		return thistime;
	}
	sent = thistime;

	/*
	 * We could not send everything in one call. Make a copy of iov that
	 * we can mess with. We keep a copy of the array start in iov_copy for
	 * the TALLOC_FREE, because we're going to modify iov later on,
	 * discarding elements.
	 */

	iov_copy = (struct iovec *)TALLOC_MEMDUP(
		talloc_tos(), orig_iov, sizeof(struct iovec) * iovcnt);

	if (iov_copy == NULL) {
		errno = ENOMEM;
		return -1;
	}
	iov = iov_copy;

	while (sent < to_send) {
		/*
		 * We have to discard "thistime" bytes from the beginning
		 * iov array, "thistime" contains the number of bytes sent
		 * via writev last.
		 */
		while (thistime > 0) {
			if (thistime < iov[0].iov_len) {
				char *new_base =
					(char *)iov[0].iov_base + thistime;
				iov[0].iov_base = new_base;
				iov[0].iov_len -= thistime;
				break;
			}
			thistime -= iov[0].iov_len;
			iov += 1;
			iovcnt -= 1;
		}

		thistime = sys_writev(fd, iov, iovcnt);
		if (thistime <= 0) {
			break;
		}
		sent += thistime;
	}

	TALLOC_FREE(iov_copy);
	return sent;
}

/****************************************************************************
 Write data to a fd.
****************************************************************************/

ssize_t write_data(int fd, const char *buffer, size_t N)
{
	ssize_t ret;
	struct iovec iov;

	iov.iov_base = CONST_DISCARD(char *, buffer);
	iov.iov_len = N;

	ret = write_data_iov(fd, &iov, 1);
	if (ret >= 0) {
		return ret;
	}

	if (fd == get_client_fd()) {
		char addr[INET6_ADDRSTRLEN];
		/*
		 * Try and give an error message saying what client failed.
		 */
		DEBUG(0, ("write_data: write failure in writing to client %s. "
			  "Error %s\n", get_peer_addr(fd,addr,sizeof(addr)),
			  strerror(errno)));
	} else {
		DEBUG(0,("write_data: write failure. Error = %s\n",
			 strerror(errno) ));
	}

	return -1;
}

/****************************************************************************
 Send a keepalive packet (rfc1002).
****************************************************************************/

bool send_keepalive(int client)
{
	unsigned char buf[4];

	buf[0] = SMBkeepalive;
	buf[1] = buf[2] = buf[3] = 0;

	return(write_data(client,(char *)buf,4) == 4);
}

/****************************************************************************
 Read 4 bytes of a smb packet and return the smb length of the packet.
 Store the result in the buffer.
 This version of the function will return a length of zero on receiving
 a keepalive packet.
 Timeout is in milliseconds.
****************************************************************************/

NTSTATUS read_smb_length_return_keepalive(int fd, char *inbuf,
					  unsigned int timeout,
					  size_t *len)
{
	int msg_type;
	NTSTATUS status;

	status = read_socket_with_timeout(fd, inbuf, 4, 4, timeout, NULL);

	if (!NT_STATUS_IS_OK(status)) {
		return status;
	}

	*len = smb_len(inbuf);
	msg_type = CVAL(inbuf,0);

	if (msg_type == SMBkeepalive) {
		DEBUG(5,("Got keepalive packet\n"));
	}

	DEBUG(10,("got smb length of %lu\n",(unsigned long)(*len)));

	return NT_STATUS_OK;
}

/****************************************************************************
 Read 4 bytes of a smb packet and return the smb length of the packet.
 Store the result in the buffer. This version of the function will
 never return a session keepalive (length of zero).
 Timeout is in milliseconds.
****************************************************************************/

NTSTATUS read_smb_length(int fd, char *inbuf, unsigned int timeout,
			 size_t *len)
{
	uint8_t msgtype = SMBkeepalive;

	while (msgtype == SMBkeepalive) {
		NTSTATUS status;

		status = read_smb_length_return_keepalive(fd, inbuf, timeout,
							  len);
		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		msgtype = CVAL(inbuf, 0);
	}

	DEBUG(10,("read_smb_length: got smb length of %lu\n",
		  (unsigned long)len));

	return NT_STATUS_OK;
}

/****************************************************************************
 Read an smb from a fd.
 The timeout is in milliseconds.
 This function will return on receipt of a session keepalive packet.
 maxlen is the max number of bytes to return, not including the 4 byte
 length. If zero it means buflen limit.
 Doesn't check the MAC on signed packets.
****************************************************************************/

NTSTATUS receive_smb_raw(int fd, char *buffer, size_t buflen, unsigned int timeout,
			 size_t maxlen, size_t *p_len)
{
	size_t len;
	NTSTATUS status;

	status = read_smb_length_return_keepalive(fd,buffer,timeout,&len);

	if (!NT_STATUS_IS_OK(status)) {
		DEBUG(10, ("receive_smb_raw: %s!\n", nt_errstr(status)));
		return status;
	}

	if (len > buflen) {
		DEBUG(0,("Invalid packet length! (%lu bytes).\n",
					(unsigned long)len));
		return NT_STATUS_INVALID_PARAMETER;
	}

	if(len > 0) {
		if (maxlen) {
			len = MIN(len,maxlen);
		}

		status = read_socket_with_timeout(
			fd, buffer+4, len, len, timeout, &len);

		if (!NT_STATUS_IS_OK(status)) {
			return status;
		}

		/* not all of samba3 properly checks for packet-termination
		 * of strings. This ensures that we don't run off into
		 * empty space. */
		SSVAL(buffer+4,len, 0);
	}

	*p_len = len;
	return NT_STATUS_OK;
}

/****************************************************************************
 Open a socket of the specified type, port, and address for incoming data.
****************************************************************************/

int open_socket_in(int type,
		uint16_t port,
		int dlevel,
		const struct sockaddr_storage *psock,
		bool rebind)
{
	struct sockaddr_storage sock;
	int res;
	socklen_t slen = sizeof(struct sockaddr_in);

	sock = *psock;

#if defined(HAVE_IPV6)
	if (sock.ss_family == AF_INET6) {
		((struct sockaddr_in6 *)&sock)->sin6_port = htons(port);
		slen = sizeof(struct sockaddr_in6);
	}
#endif
	if (sock.ss_family == AF_INET) {
		((struct sockaddr_in *)&sock)->sin_port = htons(port);
	}

	res = socket(sock.ss_family, type, 0 );
	if( res == -1 ) {
		if( DEBUGLVL(0) ) {
			dbgtext( "open_socket_in(): socket() call failed: " );
			dbgtext( "%s\n", strerror( errno ) );
		}
		return -1;
	}

	/* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */
	{
		int val = rebind ? 1 : 0;
		if( setsockopt(res,SOL_SOCKET,SO_REUSEADDR,
					(char *)&val,sizeof(val)) == -1 ) {
			if( DEBUGLVL( dlevel ) ) {
				dbgtext( "open_socket_in(): setsockopt: " );
				dbgtext( "SO_REUSEADDR = %s ",
						val?"true":"false" );
				dbgtext( "on port %d failed ", port );
				dbgtext( "with error = %s\n", strerror(errno) );
			}
		}
#ifdef SO_REUSEPORT
		if( setsockopt(res,SOL_SOCKET,SO_REUSEPORT,
					(char *)&val,sizeof(val)) == -1 ) {
			if( DEBUGLVL( dlevel ) ) {
				dbgtext( "open_socket_in(): setsockopt: ");
				dbgtext( "SO_REUSEPORT = %s ",
						val?"true":"false");
				dbgtext( "on port %d failed ", port);
				dbgtext( "with error = %s\n", strerror(errno));
			}
		}
#endif /* SO_REUSEPORT */
	}

	/* now we've got a socket - we need to bind it */
	if (bind(res, (struct sockaddr *)&sock, slen) == -1 ) {
		if( DEBUGLVL(dlevel) && (port == SMB_PORT1 ||
				port == SMB_PORT2 || port == NMB_PORT) ) {
			char addr[INET6_ADDRSTRLEN];
			print_sockaddr(addr, sizeof(addr),
					&sock);
			dbgtext( "bind failed on port %d ", port);
			dbgtext( "socket_addr = %s.\n", addr);
			dbgtext( "Error = %s\n", strerror(errno));
		}
		close(res);
		return -1;
	}

	DEBUG( 10, ( "bind succeeded on port %d\n", port ) );
	return( res );
 }

struct open_socket_out_state {
	int fd;
	struct event_context *ev;
	struct sockaddr_storage ss;
	socklen_t salen;
	uint16_t port;
	int wait_nsec;
};

static void open_socket_out_connected(struct tevent_req *subreq);

static int open_socket_out_state_destructor(struct open_socket_out_state *s)
{
	if (s->fd != -1) {
		close(s->fd);
	}
	return 0;
}

/****************************************************************************
 Create an outgoing socket. timeout is in milliseconds.
**************************************************************************/

struct tevent_req *open_socket_out_send(TALLOC_CTX *mem_ctx,
					struct event_context *ev,
					const struct sockaddr_storage *pss,
					uint16_t port,
					int timeout)
{
	char addr[INET6_ADDRSTRLEN];
	struct tevent_req *result, *subreq;
	struct open_socket_out_state *state;
	NTSTATUS status;

	result = tevent_req_create(mem_ctx, &state,
				   struct open_socket_out_state);
	if (result == NULL) {
		return NULL;
	}
	state->ev = ev;
	state->ss = *pss;
	state->port = port;
	state->wait_nsec = 10000;
	state->salen = -1;

	state->fd = socket(state->ss.ss_family, SOCK_STREAM, 0);
	if (state->fd == -1) {
		status = map_nt_error_from_unix(errno);
		goto post_status;
	}
	talloc_set_destructor(state, open_socket_out_state_destructor);

	if (!tevent_req_set_endtime(
		    result, ev, timeval_current_ofs(0, timeout*1000))) {
		goto fail;
	}

#if defined(HAVE_IPV6)
	if (pss->ss_family == AF_INET6) {
		struct sockaddr_in6 *psa6;
		psa6 = (struct sockaddr_in6 *)&state->ss;
		psa6->sin6_port = htons(port);
		if (psa6->sin6_scope_id == 0
		    && IN6_IS_ADDR_LINKLOCAL(&psa6->sin6_addr)) {
			setup_linklocal_scope_id(
				(struct sockaddr *)&(state->ss));
		}
		state->salen = sizeof(struct sockaddr_in6);
	}
#endif
	if (pss->ss_family == AF_INET) {
		struct sockaddr_in *psa;
		psa = (struct sockaddr_in *)&state->ss;
		psa->sin_port = htons(port);
		state->salen = sizeof(struct sockaddr_in);
	}

	print_sockaddr(addr, sizeof(addr), &state->ss);
	DEBUG(3,("Connecting to %s at port %u\n", addr,	(unsigned int)port));

	subreq = async_connect_send(state, state->ev, state->fd,
				    (struct sockaddr *)&state->ss,
				    state->salen);
	if ((subreq == NULL)
	    || !tevent_req_set_endtime(
		    subreq, state->ev,
		    timeval_current_ofs(0, state->wait_nsec))) {
		goto fail;
	}
	tevent_req_set_callback(subreq, open_socket_out_connected, result);
	return result;

 post_status:
	tevent_req_nterror(result, status);
	return tevent_req_post(result, ev);
 fail:
	TALLOC_FREE(result);
	return NULL;
}

static void open_socket_out_connected(struct tevent_req *subreq)
{
	struct tevent_req *req =
		tevent_req_callback_data(subreq, struct tevent_req);
	struct open_socket_out_state *state =
		tevent_req_data(req, struct open_socket_out_state);
	int ret;
	int sys_errno;

	ret = async_connect_recv(subreq, &sys_errno);
	TALLOC_FREE(subreq);
	if (ret == 0) {
		tevent_req_done(req);
		return;
	}

	if (
#ifdef ETIMEDOUT
		(sys_errno == ETIMEDOUT) ||
#endif
		(sys_errno == EINPROGRESS) ||
		(sys_errno == EALREADY) ||
		(sys_errno == EAGAIN)) {

		/*
		 * retry
		 */

		if (state->wait_nsec < 250000) {
			state->wait_nsec *= 1.5;
		}

		subreq = async_connect_send(state, state->ev, state->fd,
					    (struct sockaddr *)&state->ss,
					    state->salen);
		if (tevent_req_nomem(subreq, req)) {
			return;
		}
		if (!tevent_req_set_endtime(
			    subreq, state->ev,
			    timeval_current_ofs(0, state->wait_nsec))) {
			tevent_req_nterror(req, NT_STATUS_NO_MEMORY);
			return;
		}
		tevent_req_set_callback(subreq, open_socket_out_connected, req);
		return;
	}

#ifdef EISCONN
	if (sys_errno == EISCONN) {
		tevent_req_done(req);
		return;
	}
#endif

	/* real error */
	tevent_req_nterror(req, map_nt_error_from_unix(sys_errno));
}

NTSTATUS open_socket_out_recv(struct tevent_req *req, int *pfd)
{
	struct open_socket_out_state *state =
		tevent_req_data(req, struct open_socket_out_state);
	NTSTATUS status;

	if (tevent_req_is_nterror(req, &status)) {
		return status;
	}
	*pfd = state->fd;
	state->fd = -1;
	return NT_STATUS_OK;
}

NTSTATUS open_socket_out(const struct sockaddr_storage *pss, uint16_t port,
			 int timeout, int *pfd)
{
	TALLOC_CTX *frame = talloc_stackframe();
	struct event_context *ev;
	struct tevent_req *req;
	NTSTATUS status = NT_STATUS_NO_MEMORY;

	ev = event_context_init(frame);
	if (ev == NULL) {
		goto fail;
	}

	req = open_socket_out_send(frame, ev, pss, port, timeout);
	if (req == NULL) {
		goto fail;
	}
	if (!tevent_req_poll(req, ev)) {
		status = NT_STATUS_INTERNAL_ERROR;
		goto fail;
	}
	status = open_socket_out_recv(req, pfd);
 fail:
	TALLOC_FREE(frame);
	return status;
}

struct open_socket_out_defer_state {
	struct event_context *ev;
	struct sockaddr_storage ss;
	uint16_t port;
	int timeout;
	int fd;
};

static void open_socket_out_defer_waited(struct tevent_req *subreq);
static void open_socket_out_defer_connected(struct tevent_req *subreq);

struct tevent_req *open_socket_out_defer_send(TALLOC_CTX *mem_ctx,
					      struct event_context *ev,
					      struct timeval wait_time,
					      const struct sockaddr_storage *pss,
					      uint16_t port,
					      int timeout)
{
	struct tevent_req *req, *subreq;
	struct open_socket_out_defer_state *state;

	req = tevent_req_create(mem_ctx, &state,
				struct open_socket_out_defer_state);
	if (req == NULL) {
		return NULL;
	}
	state->ev = ev;
	state->ss = *pss;
	state->port = port;
	state->timeout = timeout;

	subreq = tevent_wakeup_send(
		state, ev,
		timeval_current_ofs(wait_time.tv_sec, wait_time.tv_usec));
	if (subreq == NULL) {
		goto fail;
	}
	tevent_req_set_callback(subreq, open_socket_out_defer_waited, req);
	return req;
 fail:
	TALLOC_FREE(req);
	return NULL;
}

static void open_socket_out_defer_waited(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct open_socket_out_defer_state *state = tevent_req_data(
		req, struct open_socket_out_defer_state);
	bool ret;

	ret = tevent_wakeup_recv(subreq);
	TALLOC_FREE(subreq);
	if (!ret) {
		tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
		return;
	}

	subreq = open_socket_out_send(state, state->ev, &state->ss,
				      state->port, state->timeout);
	if (tevent_req_nomem(subreq, req)) {
		return;
	}
	tevent_req_set_callback(subreq, open_socket_out_defer_connected, req);
}

static void open_socket_out_defer_connected(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct open_socket_out_defer_state *state = tevent_req_data(
		req, struct open_socket_out_defer_state);
	NTSTATUS status;

	status = open_socket_out_recv(subreq, &state->fd);
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		tevent_req_nterror(req, status);
		return;
	}
	tevent_req_done(req);
}

NTSTATUS open_socket_out_defer_recv(struct tevent_req *req, int *pfd)
{
	struct open_socket_out_defer_state *state = tevent_req_data(
		req, struct open_socket_out_defer_state);
	NTSTATUS status;

	if (tevent_req_is_nterror(req, &status)) {
		return status;
	}
	*pfd = state->fd;
	state->fd = -1;
	return NT_STATUS_OK;
}

/*******************************************************************
 Create an outgoing TCP socket to the first addr that connects.

 This is for simultaneous connection attempts to port 445 and 139 of a host
 or for simultatneous connection attempts to multiple DCs at once.  We return
 a socket fd of the first successful connection.

 @param[in] addrs list of Internet addresses and ports to connect to
 @param[in] num_addrs number of address/port pairs in the addrs list
 @param[in] timeout time after which we stop waiting for a socket connection
            to succeed, given in milliseconds
 @param[out] fd_index the entry in addrs which we successfully connected to
 @param[out] fd fd of the open and connected socket
 @return true on a successful connection, false if all connection attempts
         failed or we timed out
*******************************************************************/

bool open_any_socket_out(struct sockaddr_storage *addrs, int num_addrs,
			 int timeout, int *fd_index, int *fd)
{
	int i, resulting_index, res;
	int *sockets;
	bool good_connect;

	fd_set r_fds, wr_fds;
	struct timeval tv;
	int maxfd;

	int connect_loop = 10000; /* 10 milliseconds */

	timeout *= 1000; 	/* convert to microseconds */

	sockets = SMB_MALLOC_ARRAY(int, num_addrs);

	if (sockets == NULL)
		return false;

	resulting_index = -1;

	for (i=0; i<num_addrs; i++)
		sockets[i] = -1;

	for (i=0; i<num_addrs; i++) {
		sockets[i] = socket(addrs[i].ss_family, SOCK_STREAM, 0);
		if (sockets[i] < 0)
			goto done;
		set_blocking(sockets[i], false);
	}

 connect_again:
	good_connect = false;

	for (i=0; i<num_addrs; i++) {
		const struct sockaddr * a = 
		    (const struct sockaddr *)&(addrs[i]);

		if (sockets[i] == -1)
			continue;

		if (sys_connect(sockets[i], a) == 0) {
			/* Rather unlikely as we are non-blocking, but it
			 * might actually happen. */
			resulting_index = i;
			goto done;
		}

		if (errno == EINPROGRESS || errno == EALREADY ||
#ifdef EISCONN
			errno == EISCONN ||
#endif
		    errno == EAGAIN || errno == EINTR) {
			/* These are the error messages that something is
			   progressing. */
			good_connect = true;
		} else if (errno != 0) {
			/* There was a direct error */
			close(sockets[i]);
			sockets[i] = -1;
		}
	}

	if (!good_connect) {
		/* All of the connect's resulted in real error conditions */
		goto done;
	}

	/* Lets see if any of the connect attempts succeeded */

	maxfd = 0;
	FD_ZERO(&wr_fds);
	FD_ZERO(&r_fds);

	for (i=0; i<num_addrs; i++) {
		if (sockets[i] == -1)
			continue;
		FD_SET(sockets[i], &wr_fds);
		FD_SET(sockets[i], &r_fds);
		if (sockets[i]>maxfd)
			maxfd = sockets[i];
	}

	tv.tv_sec = 0;
	tv.tv_usec = connect_loop;

	res = sys_select_intr(maxfd+1, &r_fds, &wr_fds, NULL, &tv);

	if (res < 0)
		goto done;

	if (res == 0)
		goto next_round;

	for (i=0; i<num_addrs; i++) {

		if (sockets[i] == -1)
			continue;

		/* Stevens, Network Programming says that if there's a
		 * successful connect, the socket is only writable. Upon an
		 * error, it's both readable and writable. */

		if (FD_ISSET(sockets[i], &r_fds) &&
		    FD_ISSET(sockets[i], &wr_fds)) {
			/* readable and writable, so it's an error */
			close(sockets[i]);
			sockets[i] = -1;
			continue;
		}

		if (!FD_ISSET(sockets[i], &r_fds) &&
		    FD_ISSET(sockets[i], &wr_fds)) {
			/* Only writable, so it's connected */
			resulting_index = i;
			goto done;
		}
	}

 next_round:

	timeout -= connect_loop;
	if (timeout <= 0)
		goto done;
	connect_loop *= 1.5;
	if (connect_loop > timeout)
		connect_loop = timeout;
	goto connect_again;

 done:
	for (i=0; i<num_addrs; i++) {
		if (i == resulting_index)
			continue;
		if (sockets[i] >= 0)
			close(sockets[i]);
	}

	if (resulting_index >= 0) {
		*fd_index = resulting_index;
		*fd = sockets[*fd_index];
		set_blocking(*fd, true);
	}

	free(sockets);

	return (resulting_index >= 0);
}
/****************************************************************************
 Open a connected UDP socket to host on port
**************************************************************************/

int open_udp_socket(const char *host, int port)
{
	int type = SOCK_DGRAM;
	struct sockaddr_in sock_out;
	int res;
	struct in_addr addr;

	addr = interpret_addr2(host);

	res = socket(PF_INET, type, 0);
	if (res == -1) {
		return -1;
	}

	memset((char *)&sock_out,'\0',sizeof(sock_out));
	putip((char *)&sock_out.sin_addr,(char *)&addr);
	sock_out.sin_port = htons(port);
	sock_out.sin_family = PF_INET;

	if (sys_connect(res,(struct sockaddr *)&sock_out)) {
		close(res);
		return -1;
	}

	return res;
}

/*******************************************************************
 Return the IP addr of the remote end of a socket as a string.
 Optionally return the struct sockaddr_storage.
 ******************************************************************/

static const char *get_peer_addr_internal(int fd,
				char *addr_buf,
				size_t addr_buf_len,
				struct sockaddr *pss,
				socklen_t *plength)
{
	struct sockaddr_storage ss;
	socklen_t length = sizeof(ss);

	strlcpy(addr_buf,"0.0.0.0",addr_buf_len);

	if (fd == -1) {
		return addr_buf;
	}

	if (pss == NULL) {
		pss = (struct sockaddr *)&ss;
		plength = &length;
	}

	if (getpeername(fd, (struct sockaddr *)pss, plength) < 0) {
		DEBUG(0,("getpeername failed. Error was %s\n",
					strerror(errno) ));
		return addr_buf;
	}

	print_sockaddr_len(addr_buf,
			addr_buf_len,
			pss,
			*plength);
	return addr_buf;
}

/*******************************************************************
 Matchname - determine if host name matches IP address. Used to
 confirm a hostname lookup to prevent spoof attacks.
******************************************************************/

static bool matchname(const char *remotehost,
		const struct sockaddr *pss,
		socklen_t len)
{
	struct addrinfo *res = NULL;
	struct addrinfo *ailist = NULL;
	char addr_buf[INET6_ADDRSTRLEN];
	bool ret = interpret_string_addr_internal(&ailist,
			remotehost,
			AI_ADDRCONFIG|AI_CANONNAME);

	if (!ret || ailist == NULL) {
		DEBUG(3,("matchname: getaddrinfo failed for "
			"name %s [%s]\n",
			remotehost,
			gai_strerror(ret) ));
		return false;
	}

	/*
	 * Make sure that getaddrinfo() returns the "correct" host name.
	 */

	if (ailist->ai_canonname == NULL ||
		(!strequal(remotehost, ailist->ai_canonname) &&
		 !strequal(remotehost, "localhost"))) {
		DEBUG(0,("matchname: host name/name mismatch: %s != %s\n",
			 remotehost,
			 ailist->ai_canonname ?
				 ailist->ai_canonname : "(NULL)"));
		freeaddrinfo(ailist);
		return false;
	}

	/* Look up the host address in the address list we just got. */
	for (res = ailist; res; res = res->ai_next) {
		if (!res->ai_addr) {
			continue;
		}
		if (sockaddr_equal((const struct sockaddr *)res->ai_addr,
					(struct sockaddr *)pss)) {
			freeaddrinfo(ailist);
			return true;
		}
	}

	/*
	 * The host name does not map to the original host address. Perhaps
	 * someone has compromised a name server. More likely someone botched
	 * it, but that could be dangerous, too.
	 */

	DEBUG(0,("matchname: host name/address mismatch: %s != %s\n",
		print_sockaddr_len(addr_buf,
			sizeof(addr_buf),
			pss,
			len),
		 ailist->ai_canonname ? ailist->ai_canonname : "(NULL)"));

	if (ailist) {
		freeaddrinfo(ailist);
	}
	return false;
}

/*******************************************************************
 Deal with the singleton cache.
******************************************************************/

struct name_addr_pair {
	struct sockaddr_storage ss;
	const char *name;
};

/*******************************************************************
 Lookup a name/addr pair. Returns memory allocated from memcache.
******************************************************************/

static bool lookup_nc(struct name_addr_pair *nc)
{
	DATA_BLOB tmp;

	ZERO_STRUCTP(nc);

	if (!memcache_lookup(
			NULL, SINGLETON_CACHE,
			data_blob_string_const_null("get_peer_name"),
			&tmp)) {
		return false;
	}

	memcpy(&nc->ss, tmp.data, sizeof(nc->ss));
	nc->name = (const char *)tmp.data + sizeof(nc->ss);
	return true;
}

/*******************************************************************
 Save a name/addr pair.
******************************************************************/

static void store_nc(const struct name_addr_pair *nc)
{
	DATA_BLOB tmp;
	size_t namelen = strlen(nc->name);

	tmp = data_blob(NULL, sizeof(nc->ss) + namelen + 1);
	if (!tmp.data) {
		return;
	}
	memcpy(tmp.data, &nc->ss, sizeof(nc->ss));
	memcpy(tmp.data+sizeof(nc->ss), nc->name, namelen+1);

	memcache_add(NULL, SINGLETON_CACHE,
			data_blob_string_const_null("get_peer_name"),
			tmp);
	data_blob_free(&tmp);
}

/*******************************************************************
 Return the DNS name of the remote end of a socket.
******************************************************************/

const char *get_peer_name(int fd, bool force_lookup)
{
	struct name_addr_pair nc;
	char addr_buf[INET6_ADDRSTRLEN];
	struct sockaddr_storage ss;
	socklen_t length = sizeof(ss);
	const char *p;
	int ret;
	char name_buf[MAX_DNS_NAME_LENGTH];
	char tmp_name[MAX_DNS_NAME_LENGTH];

	/* reverse lookups can be *very* expensive, and in many
	   situations won't work because many networks don't link dhcp
	   with dns. To avoid the delay we avoid the lookup if
	   possible */
	if (!lp_hostname_lookups() && (force_lookup == false)) {
		length = sizeof(nc.ss);
		nc.name = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf),
			(struct sockaddr *)&nc.ss, &length);
		store_nc(&nc);
		lookup_nc(&nc);
		return nc.name ? nc.name : "UNKNOWN";
	}

	lookup_nc(&nc);

	memset(&ss, '\0', sizeof(ss));
	p = get_peer_addr_internal(fd, addr_buf, sizeof(addr_buf), (struct sockaddr *)&ss, &length);

	/* it might be the same as the last one - save some DNS work */
	if (sockaddr_equal((struct sockaddr *)&ss, (struct sockaddr *)&nc.ss)) {
		return nc.name ? nc.name : "UNKNOWN";
	}

	/* Not the same. We need to lookup. */
	if (fd == -1) {
		return "UNKNOWN";
	}

	/* Look up the remote host name. */
	ret = sys_getnameinfo((struct sockaddr *)&ss,
			length,
			name_buf,
			sizeof(name_buf),
			NULL,
			0,
			0);

	if (ret) {
		DEBUG(1,("get_peer_name: getnameinfo failed "
			"for %s with error %s\n",
			p,
			gai_strerror(ret)));
		strlcpy(name_buf, p, sizeof(name_buf));
	} else {
		if (!matchname(name_buf, (struct sockaddr *)&ss, length)) {
			DEBUG(0,("Matchname failed on %s %s\n",name_buf,p));
			strlcpy(name_buf,"UNKNOWN",sizeof(name_buf));
		}
	}

	/* can't pass the same source and dest strings in when you
	   use --enable-developer or the clobber_region() call will
	   get you */

	strlcpy(tmp_name, name_buf, sizeof(tmp_name));
	alpha_strcpy(name_buf, tmp_name, "_-.", sizeof(name_buf));
	if (strstr(name_buf,"..")) {
		strlcpy(name_buf, "UNKNOWN", sizeof(name_buf));
	}

	nc.name = name_buf;
	nc.ss = ss;

	store_nc(&nc);
	lookup_nc(&nc);
	return nc.name ? nc.name : "UNKNOWN";
}

/*******************************************************************
 Return the IP addr of the remote end of a socket as a string.
 ******************************************************************/

const char *get_peer_addr(int fd, char *addr, size_t addr_len)
{
	return get_peer_addr_internal(fd, addr, addr_len, NULL, NULL);
}

/*******************************************************************
 Create protected unix domain socket.

 Some unixes cannot set permissions on a ux-dom-sock, so we
 have to make sure that the directory contains the protection
 permissions instead.
 ******************************************************************/

int create_pipe_sock(const char *socket_dir,
		     const char *socket_name,
		     mode_t dir_perms)
{
#ifdef HAVE_UNIXSOCKET
	struct sockaddr_un sunaddr;
	struct stat st;
	int sock;
	mode_t old_umask;
	char *path = NULL;

	old_umask = umask(0);

	/* Create the socket directory or reuse the existing one */

	if (lstat(socket_dir, &st) == -1) {
		if (errno == ENOENT) {
			/* Create directory */
			if (mkdir(socket_dir, dir_perms) == -1) {
				DEBUG(0, ("error creating socket directory "
					"%s: %s\n", socket_dir,
					strerror(errno)));
				goto out_umask;
			}
		} else {
			DEBUG(0, ("lstat failed on socket directory %s: %s\n",
				socket_dir, strerror(errno)));
			goto out_umask;
		}
	} else {
		/* Check ownership and permission on existing directory */
		if (!S_ISDIR(st.st_mode)) {
			DEBUG(0, ("socket directory %s isn't a directory\n",
				socket_dir));
			goto out_umask;
		}
		if ((st.st_uid != sec_initial_uid()) ||
				((st.st_mode & 0777) != dir_perms)) {
			DEBUG(0, ("invalid permissions on socket directory "
				"%s\n", socket_dir));
			goto out_umask;
		}
	}

	/* Create the socket file */

	sock = socket(AF_UNIX, SOCK_STREAM, 0);

	if (sock == -1) {
		DEBUG(0, ("create_pipe_sock: socket error %s\n",
			strerror(errno) ));
                goto out_close;
	}

	if (asprintf(&path, "%s/%s", socket_dir, socket_name) == -1) {
                goto out_close;
	}

	unlink(path);
	memset(&sunaddr, 0, sizeof(sunaddr));
	sunaddr.sun_family = AF_UNIX;
	strlcpy(sunaddr.sun_path, path, sizeof(sunaddr.sun_path));

	if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
		DEBUG(0, ("bind failed on pipe socket %s: %s\n", path,
			strerror(errno)));
		goto out_close;
	}

	if (listen(sock, 5) == -1) {
		DEBUG(0, ("listen failed on pipe socket %s: %s\n", path,
			strerror(errno)));
		goto out_close;
	}

	SAFE_FREE(path);

	umask(old_umask);
	return sock;

out_close:
	SAFE_FREE(path);
	if (sock != -1)
		close(sock);

out_umask:
	umask(old_umask);
	return -1;

#else
        DEBUG(0, ("create_pipe_sock: No Unix sockets on this system\n"));
        return -1;
#endif /* HAVE_UNIXSOCKET */
}

/****************************************************************************
 Get my own canonical name, including domain.
****************************************************************************/

const char *get_mydnsfullname(void)
{
	struct addrinfo *res = NULL;
	char my_hostname[HOST_NAME_MAX];
	bool ret;
	DATA_BLOB tmp;

	if (memcache_lookup(NULL, SINGLETON_CACHE,
			data_blob_string_const_null("get_mydnsfullname"),
			&tmp)) {
		SMB_ASSERT(tmp.length > 0);
		return (const char *)tmp.data;
	}

	/* get my host name */
	if (gethostname(my_hostname, sizeof(my_hostname)) == -1) {
		DEBUG(0,("get_mydnsfullname: gethostname failed\n"));
		return NULL;
	}

	/* Ensure null termination. */
	my_hostname[sizeof(my_hostname)-1] = '\0';

	ret = interpret_string_addr_internal(&res,
				my_hostname,
				AI_ADDRCONFIG|AI_CANONNAME);

	if (!ret || res == NULL) {
		DEBUG(3,("get_mydnsfullname: getaddrinfo failed for "
			"name %s [%s]\n",
			my_hostname,
			gai_strerror(ret) ));
		return NULL;
	}

	/*
	 * Make sure that getaddrinfo() returns the "correct" host name.
	 */

	if (res->ai_canonname == NULL) {
		DEBUG(3,("get_mydnsfullname: failed to get "
			"canonical name for %s\n",
			my_hostname));
		freeaddrinfo(res);
		return NULL;
	}

	/* This copies the data, so we must do a lookup
	 * afterwards to find the value to return.
	 */

	memcache_add(NULL, SINGLETON_CACHE,
			data_blob_string_const_null("get_mydnsfullname"),
			data_blob_string_const_null(res->ai_canonname));

	if (!memcache_lookup(NULL, SINGLETON_CACHE,
			data_blob_string_const_null("get_mydnsfullname"),
			&tmp)) {
		tmp = data_blob_talloc(talloc_tos(), res->ai_canonname,
				strlen(res->ai_canonname) + 1);
	}

	freeaddrinfo(res);

	return (const char *)tmp.data;
}

/************************************************************
 Is this my name ?
************************************************************/

bool is_myname_or_ipaddr(const char *s)
{
	TALLOC_CTX *ctx = talloc_tos();
	char addr[INET6_ADDRSTRLEN];
	char *name = NULL;
	const char *dnsname;
	char *servername = NULL;

	if (!s) {
		return false;
	}

	/* Santize the string from '\\name' */
	name = talloc_strdup(ctx, s);
	if (!name) {
		return false;
	}

	servername = strrchr_m(name, '\\' );
	if (!servername) {
		servername = name;
	} else {
		servername++;
	}

	/* Optimize for the common case */
	if (strequal(servername, global_myname())) {
		return true;
	}

	/* Check for an alias */
	if (is_myname(servername)) {
		return true;
	}

	/* Check for loopback */
	if (strequal(servername, "127.0.0.1") ||
			strequal(servername, "::1")) {
		return true;
	}

	if (strequal(servername, "localhost")) {
		return true;
	}

	/* Maybe it's my dns name */
	dnsname = get_mydnsfullname();
	if (dnsname && strequal(servername, dnsname)) {
		return true;
	}

	/* Handle possible CNAME records - convert to an IP addr. */
	if (!is_ipaddress(servername)) {
		/* Use DNS to resolve the name, but only the first address */
		struct sockaddr_storage ss;
		if (interpret_string_addr(&ss, servername, 0)) {
			print_sockaddr(addr,
					sizeof(addr),
					&ss);
			servername = addr;
		}
	}

	/* Maybe its an IP address? */
	if (is_ipaddress(servername)) {
		struct sockaddr_storage ss;
		struct iface_struct *nics;
		int i, n;

		if (!interpret_string_addr(&ss, servername, AI_NUMERICHOST)) {
			return false;
		}

		if (ismyaddr((struct sockaddr *)&ss)) {
			return true;
		}

		if (is_zero_addr((struct sockaddr *)&ss) || 
			is_loopback_addr((struct sockaddr *)&ss)) {
			return false;
		}

		nics = TALLOC_ARRAY(ctx, struct iface_struct,
					MAX_INTERFACES);
		if (!nics) {
			return false;
		}
		n = get_interfaces(nics, MAX_INTERFACES);
		for (i=0; i<n; i++) {
			if (sockaddr_equal((struct sockaddr *)&nics[i].ip, (struct sockaddr *)&ss)) {
				TALLOC_FREE(nics);
				return true;
			}
		}
		TALLOC_FREE(nics);
	}

	/* No match */
	return false;
}

/*
 * Read an smb packet asynchronously, discard keepalives
 */

struct read_smb_state {
	struct tevent_context *ev;
	int fd;
	uint8_t *buf;
};

static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
static void read_smb_done(struct tevent_req *subreq);

struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
				 struct tevent_context *ev,
				 int fd)
{
	struct tevent_req *result, *subreq;
	struct read_smb_state *state;

	result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
	if (result == NULL) {
		return NULL;
	}
	state->ev = ev;
	state->fd = fd;

	subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
	if (subreq == NULL) {
		goto fail;
	}
	tevent_req_set_callback(subreq, read_smb_done, result);
	return result;
 fail:
	TALLOC_FREE(result);
	return NULL;
}

static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
{
	if (buflen > 4) {
		return 0;	/* We've been here, we're done */
	}
	return smb_len_large(buf);
}

static void read_smb_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct read_smb_state *state = tevent_req_data(
		req, struct read_smb_state);
	ssize_t len;
	int err;

	len = read_packet_recv(subreq, state, &state->buf, &err);
	TALLOC_FREE(subreq);
	if (len == -1) {
		tevent_req_error(req, err);
		return;
	}

	if (CVAL(state->buf, 0) == SMBkeepalive) {
		subreq = read_packet_send(state, state->ev, state->fd, 4,
					  read_smb_more, NULL);
		if (tevent_req_nomem(subreq, req)) {
			return;
		}
		tevent_req_set_callback(subreq, read_smb_done, req);
		return;
	}
	tevent_req_done(req);
}

ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
		      uint8_t **pbuf, int *perrno)
{
	struct read_smb_state *state = tevent_req_data(
		req, struct read_smb_state);

	if (tevent_req_is_unix_error(req, perrno)) {
		return -1;
	}
	*pbuf = talloc_move(mem_ctx, &state->buf);
	return talloc_get_size(*pbuf);
}

struct getaddrinfo_state {
	const char *node;
	const char *service;
	const struct addrinfo *hints;
	struct addrinfo *res;
	int ret;
};

static void getaddrinfo_do(void *private_data);
static void getaddrinfo_done(struct tevent_req *subreq);

struct tevent_req *getaddrinfo_send(TALLOC_CTX *mem_ctx,
				    struct tevent_context *ev,
				    struct fncall_context *ctx,
				    const char *node,
				    const char *service,
				    const struct addrinfo *hints)
{
	struct tevent_req *req, *subreq;
	struct getaddrinfo_state *state;

	req = tevent_req_create(mem_ctx, &state, struct getaddrinfo_state);
	if (req == NULL) {
		return NULL;
	}

	state->node = node;
	state->service = service;
	state->hints = hints;

	subreq = fncall_send(state, ev, ctx, getaddrinfo_do, state);
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, getaddrinfo_done, req);
	return req;
}

static void getaddrinfo_do(void *private_data)
{
	struct getaddrinfo_state *state =
		(struct getaddrinfo_state *)private_data;

	state->ret = getaddrinfo(state->node, state->service, state->hints,
				 &state->res);
}

static void getaddrinfo_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	int ret, err;

	ret = fncall_recv(subreq, &err);
	TALLOC_FREE(subreq);
	if (ret == -1) {
		tevent_req_error(req, err);
		return;
	}
	tevent_req_done(req);
}

int getaddrinfo_recv(struct tevent_req *req, struct addrinfo **res)
{
	struct getaddrinfo_state *state = tevent_req_data(
		req, struct getaddrinfo_state);
	int err;

	if (tevent_req_is_unix_error(req, &err)) {
		switch(err) {
		case ENOMEM:
			return EAI_MEMORY;
		default:
			return EAI_FAIL;
		}
	}
	if (state->ret == 0) {
		*res = state->res;
	}
	return state->ret;
}