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
|
/*
* Copyright (c) 2007-2010 Niels Provos and Nick Mathewson
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "event-config.h"
#define _GNU_SOURCE
#ifdef WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#undef WIN32_LEAN_AND_MEAN
#include <io.h>
#endif
#include <sys/types.h>
#ifdef _EVENT_HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef _EVENT_HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _EVENT_HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef _EVENT_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#ifdef _EVENT_HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifdef _EVENT_HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef _EVENT_HAVE_NETINET_IN6_H
#include <netinet/in6.h>
#endif
#ifndef _EVENT_HAVE_GETTIMEOFDAY
#include <sys/timeb.h>
#include <time.h>
#endif
#include <sys/stat.h>
#include "event2/util.h"
#include "util-internal.h"
#include "log-internal.h"
#include "mm-internal.h"
#include "strlcpy-internal.h"
#include "ipv6-internal.h"
/**
Read the contents of 'filename' into a newly allocated NUL-terminated
string. Set *content_out to hold this string, and *len_out to hold its
length (not including the appended NUL). If 'is_binary', open the file in
binary mode.
Returns 0 on success, -1 if the open fails, and -2 for all other failures.
Used internally only; may go away in a future version.
*/
int
evutil_read_file(const char *filename, char **content_out, size_t *len_out,
int is_binary)
{
int fd, r;
struct stat st;
char *mem;
size_t read_so_far=0;
int mode = O_RDONLY;
EVUTIL_ASSERT(content_out);
EVUTIL_ASSERT(len_out);
*content_out = NULL;
*len_out = 0;
#ifdef O_BINARY
if (is_binary)
mode |= O_BINARY;
#endif
fd = open(filename, mode);
if (fd < 0)
return -1;
if (fstat(fd, &st)) {
close(fd);
return -2;
}
mem = mm_malloc(st.st_size + 1);
if (!mem) {
close(fd);
return -2;
}
read_so_far = 0;
while ((r = read(fd, mem+read_so_far, st.st_size - read_so_far)) > 0) {
read_so_far += r;
if (read_so_far >= st.st_size)
break;
EVUTIL_ASSERT(read_so_far < st.st_size);
}
close(fd);
if (r < 0) {
mm_free(mem);
return -2;
}
mem[read_so_far] = 0;
*len_out = read_so_far;
*content_out = mem;
return 0;
}
int
evutil_socketpair(int family, int type, int protocol, evutil_socket_t fd[2])
{
#ifndef WIN32
return socketpair(family, type, protocol, fd);
#else
/* This code is originally from Tor. Used with permission. */
/* This socketpair does not work when localhost is down. So
* it's really not the same thing at all. But it's close enough
* for now, and really, when localhost is down sometimes, we
* have other problems too.
*/
evutil_socket_t listener = -1;
evutil_socket_t connector = -1;
evutil_socket_t acceptor = -1;
struct sockaddr_in listen_addr;
struct sockaddr_in connect_addr;
int size;
int saved_errno = -1;
if (protocol
|| (family != AF_INET
#ifdef AF_UNIX
&& family != AF_UNIX
#endif
)) {
EVUTIL_SET_SOCKET_ERROR(WSAEAFNOSUPPORT);
return -1;
}
if (!fd) {
EVUTIL_SET_SOCKET_ERROR(WSAEINVAL);
return -1;
}
listener = socket(AF_INET, type, 0);
if (listener < 0)
return -1;
memset(&listen_addr, 0, sizeof(listen_addr));
listen_addr.sin_family = AF_INET;
listen_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
listen_addr.sin_port = 0; /* kernel chooses port. */
if (bind(listener, (struct sockaddr *) &listen_addr, sizeof (listen_addr))
== -1)
goto tidy_up_and_fail;
if (listen(listener, 1) == -1)
goto tidy_up_and_fail;
connector = socket(AF_INET, type, 0);
if (connector < 0)
goto tidy_up_and_fail;
/* We want to find out the port number to connect to. */
size = sizeof(connect_addr);
if (getsockname(listener, (struct sockaddr *) &connect_addr, &size) == -1)
goto tidy_up_and_fail;
if (size != sizeof (connect_addr))
goto abort_tidy_up_and_fail;
if (connect(connector, (struct sockaddr *) &connect_addr,
sizeof(connect_addr)) == -1)
goto tidy_up_and_fail;
size = sizeof(listen_addr);
acceptor = accept(listener, (struct sockaddr *) &listen_addr, &size);
if (acceptor < 0)
goto tidy_up_and_fail;
if (size != sizeof(listen_addr))
goto abort_tidy_up_and_fail;
evutil_closesocket(listener);
/* Now check we are talking to ourself by matching port and host on the
two sockets. */
if (getsockname(connector, (struct sockaddr *) &connect_addr, &size) == -1)
goto tidy_up_and_fail;
if (size != sizeof (connect_addr)
|| listen_addr.sin_family != connect_addr.sin_family
|| listen_addr.sin_addr.s_addr != connect_addr.sin_addr.s_addr
|| listen_addr.sin_port != connect_addr.sin_port)
goto abort_tidy_up_and_fail;
fd[0] = connector;
fd[1] = acceptor;
return 0;
abort_tidy_up_and_fail:
saved_errno = WSAECONNABORTED;
tidy_up_and_fail:
if (saved_errno < 0)
saved_errno = WSAGetLastError();
if (listener != -1)
evutil_closesocket(listener);
if (connector != -1)
evutil_closesocket(connector);
if (acceptor != -1)
evutil_closesocket(acceptor);
EVUTIL_SET_SOCKET_ERROR(saved_errno);
return -1;
#endif
}
int
evutil_make_socket_nonblocking(evutil_socket_t fd)
{
#ifdef WIN32
{
unsigned long nonblocking = 1;
ioctlsocket(fd, FIONBIO, (unsigned long*) &nonblocking);
}
#else
{
long flags;
if ((flags = fcntl(fd, F_GETFL, NULL)) < 0) {
event_warn("fcntl(%d, F_GETFL)", fd);
return -1;
}
if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
event_warn("fcntl(%d, F_SETFL)", fd);
return -1;
}
}
#endif
return 0;
}
int
evutil_make_listen_socket_reuseable(evutil_socket_t sock)
{
#ifndef WIN32
int one = 1;
/* REUSEADDR on Unix means, "don't hang on to this address after the
* listener is closed." On Windows, though, it means "don't keep other
* processes from binding to this address while we're using it. */
return setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*) &one,
(ev_socklen_t)sizeof(one));
#else
return 0;
#endif
}
int
evutil_make_socket_closeonexec(evutil_socket_t fd)
{
#if !defined(WIN32) && defined(_EVENT_HAVE_SETFD)
long flags;
if ((flags = fcntl(fd, F_GETFD, NULL)) < 0) {
event_warn("fcntl(%d, F_GETFD)", fd);
return -1;
}
if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) == -1) {
event_warn("fcntl(%d, F_SETFD)", fd);
return -1;
}
#endif
return 0;
}
int
evutil_closesocket(evutil_socket_t sock)
{
#ifndef WIN32
return close(sock);
#else
return closesocket(sock);
#endif
}
ev_int64_t
evutil_strtoll(const char *s, char **endptr, int base)
{
#ifdef _EVENT_HAVE_STRTOLL
return (ev_int64_t)strtoll(s, endptr, base);
#elif _EVENT_SIZEOF_LONG == 8
return (ev_int64_t)strtol(s, endptr, base);
#elif defined(WIN32) && defined(_MSC_VER) && _MSC_VER < 1300
/* XXXX on old versions of MS APIs, we only support base
* 10. */
ev_int64_t r;
if (base != 10)
return 0;
r = (ev_int64_t) _atoi64(s);
while (isspace(*s))
++s;
while (isdigit(*s))
++s;
if (endptr)
*endptr = (char*) s;
return r;
#elif defined(WIN32)
return (ev_int64_t) _strtoi64(s, endptr, base);
#else
#error "I don't know how to parse 64-bit integers."
#endif
}
#ifndef _EVENT_HAVE_GETTIMEOFDAY
/* No gettimeofday; this muse be windows. */
int
evutil_gettimeofday(struct timeval *tv, struct timezone *tz)
{
struct _timeb tb;
if (tv == NULL)
return -1;
/* XXXX
* _ftime is not the greatest interface here; GetSystemTimeAsFileTime
* would give us better resolution, whereas something cobbled together
* with GetTickCount could maybe give us monotonic behavior.
*
* Either way, I think this value might be skewed to ignore the
* timezone, and just return local time. That's not so good.
*/
_ftime(&tb);
tv->tv_sec = (long) tb.time;
tv->tv_usec = ((int) tb.millitm) * 1000;
return 0;
}
#endif
#ifdef WIN32
int
evutil_socket_geterror(evutil_socket_t sock)
{
int optval, optvallen=sizeof(optval);
int err = WSAGetLastError();
if (err == WSAEWOULDBLOCK && sock >= 0) {
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*)&optval,
&optvallen))
return err;
if (optval)
return optval;
}
return err;
}
#endif
/* XXX we should use an enum here. */
/* 2 for connection refused, 1 for connected, 0 for not yet, -1 for error. */
int
evutil_socket_connect(evutil_socket_t *fd_ptr, struct sockaddr *sa, int socklen)
{
int made_fd = 0;
if (*fd_ptr < 0) {
made_fd = 1;
if ((*fd_ptr = socket(sa->sa_family, SOCK_STREAM, 0)) < 0)
goto err;
if (evutil_make_socket_nonblocking(*fd_ptr) < 0) {
goto err;
}
}
if (connect(*fd_ptr, sa, socklen) < 0) {
int e = evutil_socket_geterror(*fd_ptr);
if (EVUTIL_ERR_CONNECT_RETRIABLE(e))
return 0;
if (EVUTIL_ERR_CONNECT_REFUSED(e))
return 2;
goto err;
} else {
return 1;
}
err:
if (made_fd) {
evutil_closesocket(*fd_ptr);
*fd_ptr = -1;
}
return -1;
}
/* Check whether a socket on which we called connect() is done
connecting. Return 1 for connected, 0 for not yet, -1 for error. In the
error case, set the current socket errno to the error that happened during
the connect operation. */
int
evutil_socket_finished_connecting(evutil_socket_t fd)
{
int e;
ev_socklen_t elen = sizeof(e);
if (getsockopt(fd, SOL_SOCKET, SO_ERROR, (void*)&e, &elen) < 0)
return -1;
if (e) {
if (EVUTIL_ERR_CONNECT_RETRIABLE(e))
return 0;
EVUTIL_SET_SOCKET_ERROR(e);
return -1;
}
return 1;
}
#if (EVUTIL_AI_PASSIVE|EVUTIL_AI_CANONNAME|EVUTIL_AI_NUMERICHOST| \
EVUTIL_AI_NUMERICSERV|EVUTIL_AI_V4MAPPED|EVUTIL_AI_ALL| \
EVUTIL_AI_ADDRCONFIG) != \
(EVUTIL_AI_PASSIVE^EVUTIL_AI_CANONNAME^EVUTIL_AI_NUMERICHOST^ \
EVUTIL_AI_NUMERICSERV^EVUTIL_AI_V4MAPPED^EVUTIL_AI_ALL^ \
EVUTIL_AI_ADDRCONFIG)
#error "Some of our EVUTIL_AI_* flags seem to overlap with system AI_* flags"
#endif
/* We sometimes need to know whether we have an ipv4 address and whether we
have an ipv6 address. If 'have_checked_interfaces', then we've already done
the test. If 'had_ipv4_address', then it turns out we had an ipv4 address.
If 'had_ipv6_address', then it turns out we had an ipv6 address. These are
set by evutil_check_interfaces. */
static int have_checked_interfaces, had_ipv4_address, had_ipv6_address;
/* Test whether we have an ipv4 interface and an ipv6 interface. Return 0 if
* the test seemed successful. */
static int
evutil_check_interfaces(int force_recheck)
{
const char ZEROES[] = "\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00";
evutil_socket_t fd = -1;
struct sockaddr_in sin, sin_out;
struct sockaddr_in6 sin6, sin6_out;
ev_socklen_t sin_out_len = sizeof(sin_out);
ev_socklen_t sin6_out_len = sizeof(sin6_out);
int r;
char buf[128];
if (have_checked_interfaces && !force_recheck)
return 0;
/* To check whether we have an interface open for a given protocol, we
* try to make a UDP 'connection' to a remote host on the internet.
* We don't actually use it, so the address doesn't matter, but we
* want to pick one that keep us from using a host- or link-local
* interface. */
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(53);
r = evutil_inet_pton(AF_INET, "18.244.0.188", &sin.sin_addr);
EVUTIL_ASSERT(r);
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(53);
r = evutil_inet_pton(AF_INET6, "2001:4860:b002::68", &sin6.sin6_addr);
EVUTIL_ASSERT(r);
memset(&sin_out, 0, sizeof(sin_out));
memset(&sin6_out, 0, sizeof(sin6_out));
/* XXX some errnos mean 'no address'; some mean 'not enough sockets'. */
if ((fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) >= 0 &&
connect(fd, (struct sockaddr*)&sin, sizeof(sin)) == 0 &&
getsockname(fd, (struct sockaddr*)&sin_out, &sin_out_len) == 0) {
/* We might have an IPv4 interface. */
ev_uint32_t addr = ntohl(sin_out.sin_addr.s_addr);
if (addr == 0 || (addr&0xff000000) == 127 ||
(addr & 0xff) == 255 || (addr & 0xf0) == 14) {
evutil_inet_ntop(AF_INET, &sin_out.sin_addr,
buf, sizeof(buf));
/* This is a reserved, ipv4compat, ipv4map, loopback,
* link-local or unspecified address. The host should
* never have given it to us; it could never connect
* to sin. */
event_warnx("Got a strange local ipv4 address %s",buf);
} else {
event_debug(("Detected an IPv4 interface"));
had_ipv4_address = 1;
}
}
if (fd >= 0)
evutil_closesocket(fd);
if ((fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP)) >= 0 &&
connect(fd, (struct sockaddr*)&sin6, sizeof(sin6)) == 0 &&
getsockname(fd, (struct sockaddr*)&sin6_out, &sin6_out_len) == 0) {
/* We might have an IPv6 interface. */
const unsigned char *addr =
(unsigned char*)sin6_out.sin6_addr.s6_addr;
if (!memcmp(addr, ZEROES, 8) ||
(addr[0] == 0xfe && (addr[1] & 0xc0) == 0x80)) {
/* This is a reserved, ipv4compat, ipv4map, loopback,
* link-local or unspecified address. The host should
* never have given it to us; it could never connect
* to sin6. */
evutil_inet_ntop(AF_INET6, &sin6_out.sin6_addr,
buf, sizeof(buf));
event_warnx("Got a strange local ipv6 address %s",buf);
} else {
event_debug(("Detected an IPv4 interface"));
had_ipv6_address = 1;
}
}
if (fd >= 0)
evutil_closesocket(fd);
return 0;
}
/* Internal addrinfo flag. This one is set when we allocate the addrinfo from
* inside libevent. Otherwise, the built-in getaddrinfo() function allocated
* it, and we should trust what they said.
**/
#define EVUTIL_AI_LIBEVENT_ALLOCATED 0x80000000
/* Helper: construct a new addrinfo containing the socket address in
* 'sa', which must be a sockaddr_in or a sockaddr_in6. Take the
* socktype and protocol info from hints. If they weren't set, then
* allocate both a TCP and a UDP addrinfo.
*/
struct evutil_addrinfo *
evutil_new_addrinfo(struct sockaddr *sa, ev_socklen_t socklen,
const struct evutil_addrinfo *hints)
{
struct evutil_addrinfo *res;
EVUTIL_ASSERT(hints);
if (hints->ai_socktype == 0 && hints->ai_protocol == 0) {
/* Indecisive user! Give them a UDP and a TCP. */
struct evutil_addrinfo *r1, *r2;
struct evutil_addrinfo tmp;
memcpy(&tmp, hints, sizeof(tmp));
tmp.ai_socktype = SOCK_STREAM; tmp.ai_protocol = IPPROTO_TCP;
r1 = evutil_new_addrinfo(sa, socklen, &tmp);
if (!r1)
return NULL;
tmp.ai_socktype = SOCK_DGRAM; tmp.ai_protocol = IPPROTO_UDP;
r2 = evutil_new_addrinfo(sa, socklen, &tmp);
if (!r2) {
evutil_freeaddrinfo(r1);
return NULL;
}
r1->ai_next = r2;
return r1;
}
/* We're going to allocate extra space to hold the sockaddr. */
res = mm_calloc(1,sizeof(struct evutil_addrinfo)+socklen);
if (!res)
return NULL;
res->ai_addr = (struct sockaddr*)
(((char*)res) + sizeof(struct evutil_addrinfo));
memcpy(res->ai_addr, sa, socklen);
res->ai_addrlen = socklen;
res->ai_family = sa->sa_family; /* Same or not? XXX */
res->ai_flags = EVUTIL_AI_LIBEVENT_ALLOCATED;
res->ai_socktype = hints->ai_socktype;
res->ai_protocol = hints->ai_protocol;
return res;
}
/* Append the addrinfo 'append' to the end of 'first', and return the start of
* the list. Either element can be NULL, in which case we return the element
* that is not NULL. */
struct evutil_addrinfo *
evutil_addrinfo_append(struct evutil_addrinfo *first,
struct evutil_addrinfo *append)
{
struct evutil_addrinfo *ai = first;
if (!ai)
return append;
while (ai->ai_next)
ai = ai->ai_next;
ai->ai_next = append;
return first;
}
static int
parse_numeric_servname(const char *servname)
{
int n;
char *endptr=NULL;
n = (int) strtol(servname, &endptr, 10);
if (n>=0 && n <= 65535 && servname[0] && endptr && !endptr[0])
return n;
else
return -1;
}
/** Parse a service name in 'servname', which can be a decimal port.
* Return the port number, or -1 on error.
*/
static int
evutil_parse_servname(const char *servname, const char *protocol,
const struct evutil_addrinfo *hints)
{
int n = parse_numeric_servname(servname);
if (n>=0)
return n;
#if defined(_EVENT_HAVE_GETSERVBYNAME) || defined(WIN32)
if (!(hints->ai_flags & EVUTIL_AI_NUMERICSERV)) {
struct servent *ent = getservbyname(servname, protocol);
if (ent) {
return ntohs(ent->s_port);
}
}
#endif
return -1;
}
/* Return a string corresponding to a protocol number that we can pass to
* getservyname. */
static const char *
evutil_unparse_protoname(int proto)
{
switch (proto) {
case 0:
return NULL;
case IPPROTO_TCP:
return "tcp";
case IPPROTO_UDP:
return "udp";
#ifdef IPPROTO_SCTP
case IPPROTO_SCTP:
return "sctp";
#endif
default:
#ifdef _EVENT_HAVE_GETPROTOBYNUMBER
{
struct protoent *ent = getprotobynumber(proto);
if (ent)
return ent->p_name;
}
#endif
return NULL;
}
}
static void
evutil_getaddrinfo_infer_protocols(struct evutil_addrinfo *hints)
{
/* If we can guess the protocol from the socktype, do so. */
if (!hints->ai_protocol && hints->ai_socktype) {
if (hints->ai_socktype == SOCK_DGRAM)
hints->ai_protocol = IPPROTO_UDP;
else if (hints->ai_socktype == SOCK_STREAM)
hints->ai_protocol = IPPROTO_TCP;
}
/* Set the socktype if it isn't set. */
if (!hints->ai_socktype && hints->ai_protocol) {
if (hints->ai_protocol == IPPROTO_UDP)
hints->ai_socktype = SOCK_DGRAM;
else if (hints->ai_protocol == IPPROTO_TCP)
hints->ai_socktype = SOCK_STREAM;
#ifdef IPPROTO_SCTP
else if (hints->ai_protocol == IPPROTO_SCTP)
hints->ai_socktype = SOCK_STREAM;
#endif
}
}
/** Implements the part of looking up hosts by name that's common to both
* the blocking and nonblocking resolver:
* - Adjust 'hints' to have a reasonable socktype and protocol.
* - Look up the port based on 'servname', and store it in *portnum,
* - Handle the nodename==NULL case
* - Handle some invalid arguments cases.
* - Handle the cases where nodename is an IPv4 or IPv6 address.
*
* If we need the resolver to look up the hostname, we return
* EVUTIL_EAI_NEED_RESOLVE. Otherwise, we can completely implement
* getaddrinfo: we return 0 or an appropriate EVUTIL_EAI_* error, and
* set *res as getaddrinfo would.
*/
int
evutil_getaddrinfo_common(const char *nodename, const char *servname,
struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum)
{
int port = 0;
const char *pname;
if (nodename == NULL && servname == NULL)
return EVUTIL_EAI_NONAME;
/* We only understand 3 families */
if (hints->ai_family != PF_UNSPEC && hints->ai_family != PF_INET &&
hints->ai_family != PF_INET6)
return EVUTIL_EAI_FAMILY;
evutil_getaddrinfo_infer_protocols(hints);
/* Look up the port number and protocol, if possible. */
pname = evutil_unparse_protoname(hints->ai_protocol);
if (servname) {
/* XXXX We could look at the protocol we got back from
* getservbyname, but it doesn't seem too useful. */
port = evutil_parse_servname(servname, pname, hints);
if (port < 0) {
return EVUTIL_EAI_NONAME;
}
}
/* If we have no node name, then we're supposed to bind to 'any' and
* connect to localhost. */
if (nodename == NULL) {
struct evutil_addrinfo *res4=NULL, *res6=NULL;
if (hints->ai_family != PF_INET) { /* INET6 or UNSPEC. */
struct sockaddr_in6 sin6;
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(port);
if (hints->ai_flags & AI_PASSIVE) {
/* Bind to :: */
} else {
/* connect to ::1 */
sin6.sin6_addr.s6_addr[15] = 1;
}
res6 = evutil_new_addrinfo((struct sockaddr*)&sin6,
sizeof(sin6), hints);
if (!res6)
return EVUTIL_EAI_MEMORY;
}
if (hints->ai_family != PF_INET6) { /* INET or UNSPEC */
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
if (hints->ai_flags & AI_PASSIVE) {
/* Bind to 0.0.0.0 */
} else {
/* connect to 127.0.0.1 */
sin.sin_addr.s_addr = htonl(0x7f000001);
}
res4 = evutil_new_addrinfo((struct sockaddr*)&sin,
sizeof(sin), hints);
if (!res4) {
if (res6)
evutil_freeaddrinfo(res6);
return EVUTIL_EAI_MEMORY;
}
}
*res = evutil_addrinfo_append(res4, res6);
return 0;
}
/* If we can, we should try to parse the hostname without resolving
* it. */
/* Try ipv6. */
if (hints->ai_family == PF_INET6 || hints->ai_family == PF_UNSPEC) {
struct sockaddr_in6 sin6;
memset(&sin6, 0, sizeof(sin6));
if (1==evutil_inet_pton(AF_INET6, nodename, &sin6.sin6_addr)) {
/* Got an ipv6 address. */
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(port);
*res = evutil_new_addrinfo((struct sockaddr*)&sin6,
sizeof(sin6), hints);
if (!*res)
return EVUTIL_EAI_MEMORY;
return 0;
}
}
/* Try ipv4. */
if (hints->ai_family == PF_INET || hints->ai_family == PF_UNSPEC) {
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
if (1==evutil_inet_pton(AF_INET, nodename, &sin.sin_addr)) {
/* Got an ipv6 address. */
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
*res = evutil_new_addrinfo((struct sockaddr*)&sin,
sizeof(sin), hints);
if (!*res)
return EVUTIL_EAI_MEMORY;
return 0;
}
}
/* If we have reached this point, we definitely need to do a DNS
* lookup. */
if ((hints->ai_flags & EVUTIL_AI_NUMERICHOST)) {
/* If we're not allowed to do one, then say so. */
return EVUTIL_EAI_NONAME;
}
*portnum = port;
return EVUTIL_EAI_NEED_RESOLVE;
}
#ifdef _EVENT_HAVE_GETADDRINFO
#define USE_NATIVE_GETADDRINFO
#endif
#ifdef USE_NATIVE_GETADDRINFO
/* A mask of all the flags that we declare, so we can clear them before calling
* the native getaddrinfo */
static const unsigned int ALL_NONNATIVE_AI_FLAGS =
#ifndef AI_PASSIVE
EVUTIL_AI_PASSIVE |
#endif
#ifndef AI_CANONNAME
EVUTIL_AI_CANONNAME |
#endif
#ifndef AI_NUMERICHOST
EVUTIL_AI_NUMERICHOST |
#endif
#ifndef AI_NUMERICSERV
EVUTIL_AI_NUMERICSERV |
#endif
#ifndef AI_ADDRCONFIG
EVUTIL_AI_ADDRCONFIG |
#endif
#ifndef AI_ALL
EVUTIL_AI_ALL |
#endif
#ifndef AI_V4MAPPED
EVUTIL_AI_V4MAPPED |
#endif
EVUTIL_AI_LIBEVENT_ALLOCATED;
static const unsigned int ALL_NATIVE_AI_FLAGS =
#ifdef AI_PASSIVE
AI_PASSIVE |
#endif
#ifdef AI_CANONNAME
AI_CANONNAME |
#endif
#ifdef AI_NUMERICHOST
AI_NUMERICHOST |
#endif
#ifdef AI_NUMERICSERV
AI_NUMERICSERV |
#endif
#ifdef AI_ADDRCONFIG
AI_ADDRCONFIG |
#endif
#ifdef AI_ALL
AI_ALL |
#endif
#ifdef AI_V4MAPPED
AI_V4MAPPED |
#endif
0;
#endif
#ifndef USE_NATIVE_GETADDRINFO
/* Helper for systems with no getaddrinfo(): make one or more addrinfos out of
* a struct hostent.
*/
static struct evutil_addrinfo *
addrinfo_from_hostent(const struct hostent *ent,
int port, const struct evutil_addrinfo *hints)
{
int i;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
struct sockaddr *sa;
int socklen;
struct evutil_addrinfo *res=NULL, *ai;
void *addrp;
if (ent->h_addrtype == PF_INET) {
memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
sa = (struct sockaddr *)&sin;
socklen = sizeof(struct sockaddr_in);
addrp = &sin.sin_addr;
if (ent->h_length != sizeof(sin.sin_addr)) {
event_warnx("Weird h_length from gethostbyname");
return NULL;
}
} else if (ent->h_addrtype == PF_INET6) {
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(port);
sa = (struct sockaddr *)&sin6;
socklen = sizeof(struct sockaddr_in);
addrp = &sin6.sin6_addr;
if (ent->h_length != sizeof(sin6.sin6_addr)) {
event_warnx("Weird h_length from gethostbyname");
return NULL;
}
} else
return NULL;
for (i = 0; ent->h_addr_list[i]; ++i) {
memcpy(addrp, ent->h_addr_list[i], ent->h_length);
ai = evutil_new_addrinfo(sa, socklen, hints);
if (!ai) {
evutil_freeaddrinfo(res);
return NULL;
}
res = evutil_addrinfo_append(res, ai);
}
if (res && ((hints->ai_flags & EVUTIL_AI_CANONNAME) && ent->h_name))
res->ai_canonname = mm_strdup(ent->h_name);
return res;
}
#endif
/* If the EVUTIL_AI_ADDRCONFIG flag is set on hints->ai_flags, and
* hints->ai_family is PF_UNSPEC, then revise the value of hints->ai_family so
* that we'll only get addresses we could maybe connect to.
*/
void
evutil_adjust_hints_for_addrconfig(struct evutil_addrinfo *hints)
{
if (!(hints->ai_flags & EVUTIL_AI_ADDRCONFIG))
return;
if (hints->ai_family != PF_UNSPEC)
return;
if (!have_checked_interfaces)
evutil_check_interfaces(0);
if (had_ipv4_address && !had_ipv6_address) {
hints->ai_family = PF_INET;
} else if (!had_ipv4_address && had_ipv6_address) {
hints->ai_family = PF_INET6;
}
}
#ifdef USE_NATIVE_GETADDRINFO
static int need_numeric_port_hack_=0;
static int need_socktype_protocol_hack_=0;
static int tested_for_getaddrinfo_hacks=0;
/* Some older BSDs (like OpenBSD up to 4.6) used to believe that
giving a numeric port without giving an ai_socktype was verboten.
We test for this so we can apply an appropriate workaround. If it
turns out that the bug is present, then:
- If nodename==NULL and servname is numeric, we build an answer
ourselves using evutil_getaddrinfo_common().
- If nodename!=NULL and servname is numeric, then we set
servname=NULL when calling getaddrinfo, and post-process the
result to set the ports on it.
We test for this bug at runtime, since otherwise we can't have the
same binary run on multiple BSD versions.
- Some versions of Solaris believe that it's nice to leave to protocol
field set to 0. We test for this so we can apply an appropriate
workaround.
*/
static void
test_for_getaddrinfo_hacks(void)
{
int r, r2;
struct evutil_addrinfo *ai=NULL, *ai2=NULL;
struct evutil_addrinfo hints;
memset(&hints,0,sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_flags =
#ifdef AI_NUMERICHOST
AI_NUMERICHOST |
#endif
#ifdef AI_NUMERICSERV
AI_NUMERICSERV |
#endif
0;
r = getaddrinfo("1.2.3.4", "80", &hints, &ai);
hints.ai_socktype = SOCK_STREAM;
r2 = getaddrinfo("1.2.3.4", "80", &hints, &ai2);
if (r2 == 0 && r != 0) {
need_numeric_port_hack_=1;
}
if (ai2 && ai2->ai_protocol == 0) {
need_socktype_protocol_hack_=1;
}
if (ai)
freeaddrinfo(ai);
if (ai2)
freeaddrinfo(ai2);
tested_for_getaddrinfo_hacks=1;
}
static inline int
need_numeric_port_hack(void)
{
if (!tested_for_getaddrinfo_hacks)
test_for_getaddrinfo_hacks();
return need_numeric_port_hack_;
}
static inline int
need_socktype_protocol_hack(void)
{
if (!tested_for_getaddrinfo_hacks)
test_for_getaddrinfo_hacks();
return need_socktype_protocol_hack_;
}
static void
apply_numeric_port_hack(int port, struct evutil_addrinfo **ai)
{
/* Now we run through the list and set the ports on all of the
* results where ports would make sense. */
for ( ; *ai; ai = &(*ai)->ai_next) {
struct sockaddr *sa = (*ai)->ai_addr;
if (sa && sa->sa_family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in*)sa;
sin->sin_port = htons(port);
} else if (sa && sa->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)sa;
sin6->sin6_port = htons(port);
} else {
/* A numeric port makes no sense here; remove this one
* from the list. */
struct evutil_addrinfo *victim = *ai;
*ai = victim->ai_next;
victim->ai_next = NULL;
freeaddrinfo(victim);
}
}
}
static void
apply_socktype_protocol_hack(struct evutil_addrinfo *ai)
{
struct evutil_addrinfo *ai_new;
for (; ai; ai = ai->ai_next) {
evutil_getaddrinfo_infer_protocols(ai);
if (ai->ai_socktype || ai->ai_protocol)
continue;
ai_new = mm_malloc(sizeof(*ai_new));
memcpy(ai_new, ai, sizeof(*ai_new));
ai->ai_socktype = SOCK_STREAM;
ai->ai_protocol = IPPROTO_TCP;
ai_new->ai_socktype = SOCK_DGRAM;
ai_new->ai_protocol = IPPROTO_UDP;
ai_new->ai_next = ai->ai_next;
ai->ai_next = ai_new;
}
}
#endif
int
evutil_getaddrinfo(const char *nodename, const char *servname,
const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res)
{
#ifdef USE_NATIVE_GETADDRINFO
struct evutil_addrinfo hints;
int portnum=-1, need_np_hack, err;
if (hints_in) {
memcpy(&hints, hints_in, sizeof(hints));
} else {
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
}
#ifndef AI_ADDRCONFIG
/* Not every system has AI_ADDRCONFIG, so fake it. */
if (hints.ai_family == PF_UNSPEC &&
(hints.ai_flags & EVUTIL_AI_ADDRCONFIG)) {
evutil_adjust_hints_for_addrconfig(&hints);
}
#endif
#ifndef AI_NUMERICSERV
/* Not every system has AI_NUMERICSERV, so fake it. */
if (hints.ai_flags & EVUTIL_AI_NUMERICSERV) {
if (servname && parse_numeric_servname(servname)<0)
return EVUTIL_EAI_NONAME;
}
#endif
/* Enough operating systems handle enough common non-resolve
* cases here weirdly enough that we are better off just
* overriding them. For example:
*
* - Windows doesn't like to infer the protocol from the
* socket type, or fill in socket or protocol types much at
* all. It also seems to do its own broken implicit
* always-on version of AI_ADDRCONFIG that keeps it from
* ever resolving even a literal IPv6 address when
* ai_addrtype is PF_UNSPEC.
*/
#ifdef WIN32
{
int tmp_port;
err = evutil_getaddrinfo_common(nodename,servname,&hints,
res, &tmp_port);
if (err == 0 ||
err == EVUTIL_EAI_MEMORY ||
err == EVUTIL_EAI_NONAME)
return err;
/* If we make it here, the system getaddrinfo can
* have a crack at it. */
}
#endif
/* See documentation for need_numeric_port_hack above.*/
need_np_hack = need_numeric_port_hack() && servname && !hints.ai_socktype
&& ((portnum=parse_numeric_servname(servname)) >= 0);
if (need_np_hack) {
if (!nodename)
return evutil_getaddrinfo_common(
NULL,servname,&hints, res, &portnum);
servname = NULL;
}
if (need_socktype_protocol_hack()) {
evutil_getaddrinfo_infer_protocols(&hints);
}
/* Make sure that we didn't actually steal any AI_FLAGS values that
* the system is using. (This is a constant expression, and should ge
* optimized out.)
*
* XXXX Turn this into a compile-time failure rather than a run-time
* failure.
*/
EVUTIL_ASSERT((ALL_NONNATIVE_AI_FLAGS & ALL_NATIVE_AI_FLAGS) == 0);
/* Clear any flags that only libevent understands. */
hints.ai_flags &= ~ALL_NONNATIVE_AI_FLAGS;
err = getaddrinfo(nodename, servname, &hints, res);
if (need_np_hack)
apply_numeric_port_hack(portnum, res);
if (need_socktype_protocol_hack()) {
apply_socktype_protocol_hack(*res);
}
return err;
#else
int port=0, err;
struct hostent *ent = NULL;
struct evutil_addrinfo hints;
if (hints_in) {
memcpy(&hints, hints_in, sizeof(hints));
} else {
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
}
evutil_adjust_hints_for_addrconfig(&hints);
err = evutil_getaddrinfo_common(nodename, servname, &hints, res, &port);
if (err != EVUTIL_EAI_NEED_RESOLVE) {
/* We either succeeded or failed. No need to continue */
return err;
}
err = 0;
/* Use any of the various gethostbyname_r variants as available. */
{
#ifdef _EVENT_HAVE_GETHOSTBYNAME_R_6_ARG
/* This one is what glibc provides. */
char buf[2048];
struct hostent hostent;
int r;
r = gethostbyname_r(nodename, &hostent, buf, sizeof(buf), &ent,
&err);
#elif defined(_EVENT_HAVE_GETHOSTBYNAME_R_5_ARG)
char buf[2048];
struct hostent hostent;
ent = gethostbyname_r(nodename, &hostent, buf, sizeof(buf),
&err);
#elif defined(_EVENT_HAVE_GETHOSTBYNAME_R_3_ARG)
struct hostent_data data;
struct hostent hostent;
memset(&data, 0, sizeof(data));
err = gethostbyname_r(nodename, &hostent, &data);
ent = err ? NULL : &hostent;
#else
/* fall back to gethostbyname. */
/* XXXX This needs a lock everywhere but Windows. */
ent = gethostbyname(nodename);
#ifdef WIN32
err = WSAGetLastError();
#else
err = h_errno;
#endif
#endif
/* Now we have either ent or err set. */
if (!ent) {
/* XXX is this right for windows ? */
switch (err) {
case TRY_AGAIN:
return EVUTIL_EAI_AGAIN;
case NO_RECOVERY:
default:
return EVUTIL_EAI_FAIL;
case HOST_NOT_FOUND:
return EVUTIL_EAI_NONAME;
case NO_ADDRESS:
#if NO_DATA != NO_ADDRESS
case NO_DATA:
#endif
return EVUTIL_EAI_NODATA;
}
}
if (ent->h_addrtype != hints.ai_family &&
hints.ai_family != PF_UNSPEC) {
/* This wasn't the type we were hoping for. Too bad
* we never had a chance to ask gethostbyname for what
* we wanted. */
return EVUTIL_EAI_NONAME;
}
/* Make sure we got _some_ answers. */
if (ent->h_length == 0)
return EVUTIL_EAI_NODATA;
/* If we got an address type we don't know how to make a
sockaddr for, give up. */
if (ent->h_addrtype != PF_INET && ent->h_addrtype != PF_INET6)
return EVUTIL_EAI_FAMILY;
*res = addrinfo_from_hostent(ent, port, &hints);
if (! *res)
return EVUTIL_EAI_MEMORY;
}
return 0;
#endif
}
void
evutil_freeaddrinfo(struct evutil_addrinfo *ai)
{
#ifdef _EVENT_HAVE_GETADDRINFO
if (!(ai->ai_flags & EVUTIL_AI_LIBEVENT_ALLOCATED)) {
freeaddrinfo(ai);
return;
}
#endif
while (ai) {
struct evutil_addrinfo *next = ai->ai_next;
if (ai->ai_canonname)
mm_free(ai->ai_canonname);
mm_free(ai);
ai = next;
}
}
static evdns_getaddrinfo_fn evdns_getaddrinfo_impl = NULL;
void
evutil_set_evdns_getaddrinfo_fn(evdns_getaddrinfo_fn fn)
{
if (!evdns_getaddrinfo_impl)
evdns_getaddrinfo_impl = fn;
}
/* Internal helper function: act like evdns_getaddrinfo if dns_base is set;
* otherwise do a blocking resolve and pass the result to the callback in the
* way that evdns_getaddrinfo would.
*/
int
evutil_getaddrinfo_async(struct evdns_base *dns_base,
const char *nodename, const char *servname,
const struct evutil_addrinfo *hints_in,
void (*cb)(int, struct evutil_addrinfo *, void *), void *arg)
{
if (dns_base && evdns_getaddrinfo_impl) {
evdns_getaddrinfo_impl(
dns_base, nodename, servname, hints_in, cb, arg);
} else {
struct evutil_addrinfo *ai=NULL;
int err;
err = evutil_getaddrinfo(nodename, servname, hints_in, &ai);
cb(err, ai, arg);
}
return 0;
}
const char *
evutil_gai_strerror(int err)
{
/* As a sneaky side-benefit, this case statement will get most
* compilers to tell us if any of the error codes we defined
* conflict with the platform's native error codes. */
switch (err) {
case EVUTIL_EAI_CANCEL:
return "Request cancelled";
case 0:
return "No error";
case EVUTIL_EAI_ADDRFAMILY:
return "address family for nodename not supported";
case EVUTIL_EAI_AGAIN:
return "temporary failure in name resolution";
case EVUTIL_EAI_BADFLAGS:
return "invalid value for ai_flags";
case EVUTIL_EAI_FAIL:
return "non-recoverable failure in name resolution";
case EVUTIL_EAI_FAMILY:
return "ai_family not supported";
case EVUTIL_EAI_MEMORY:
return "memory allocation failure";
case EVUTIL_EAI_NODATA:
return "no address associated with nodename";
case EVUTIL_EAI_NONAME:
return "nodename nor servname provided, or not known";
case EVUTIL_EAI_SERVICE:
return "servname not supported for ai_socktype";
case EVUTIL_EAI_SOCKTYPE:
return "ai_socktype not supported";
case EVUTIL_EAI_SYSTEM:
return "system error";
default:
#if defined(USE_NATIVE_GETADDRINFO) && defined(WIN32)
return gai_strerrorA(err);
#elif defined(USE_NATIVE_GETADDRINFO)
return gai_strerror(err);
#else
return "Unknown error code";
#endif
}
}
#ifdef WIN32
#define E(code, s) { code, (s " [" #code " ]") }
static struct { int code; const char *msg; } windows_socket_errors[] = {
E(WSAEINTR, "Interrupted function call"),
E(WSAEACCES, "Permission denied"),
E(WSAEFAULT, "Bad address"),
E(WSAEINVAL, "Invalid argument"),
E(WSAEMFILE, "Too many open files"),
E(WSAEWOULDBLOCK, "Resource temporarily unavailable"),
E(WSAEINPROGRESS, "Operation now in progress"),
E(WSAEALREADY, "Operation already in progress"),
E(WSAENOTSOCK, "Socket operation on nonsocket"),
E(WSAEDESTADDRREQ, "Destination address required"),
E(WSAEMSGSIZE, "Message too long"),
E(WSAEPROTOTYPE, "Protocol wrong for socket"),
E(WSAENOPROTOOPT, "Bad protocol option"),
E(WSAEPROTONOSUPPORT, "Protocol not supported"),
E(WSAESOCKTNOSUPPORT, "Socket type not supported"),
/* What's the difference between NOTSUPP and NOSUPPORT? :) */
E(WSAEOPNOTSUPP, "Operation not supported"),
E(WSAEPFNOSUPPORT, "Protocol family not supported"),
E(WSAEAFNOSUPPORT, "Address family not supported by protocol family"),
E(WSAEADDRINUSE, "Address already in use"),
E(WSAEADDRNOTAVAIL, "Cannot assign requested address"),
E(WSAENETDOWN, "Network is down"),
E(WSAENETUNREACH, "Network is unreachable"),
E(WSAENETRESET, "Network dropped connection on reset"),
E(WSAECONNABORTED, "Software caused connection abort"),
E(WSAECONNRESET, "Connection reset by peer"),
E(WSAENOBUFS, "No buffer space available"),
E(WSAEISCONN, "Socket is already connected"),
E(WSAENOTCONN, "Socket is not connected"),
E(WSAESHUTDOWN, "Cannot send after socket shutdown"),
E(WSAETIMEDOUT, "Connection timed out"),
E(WSAECONNREFUSED, "Connection refused"),
E(WSAEHOSTDOWN, "Host is down"),
E(WSAEHOSTUNREACH, "No route to host"),
E(WSAEPROCLIM, "Too many processes"),
/* Yes, some of these start with WSA, not WSAE. No, I don't know why. */
E(WSASYSNOTREADY, "Network subsystem is unavailable"),
E(WSAVERNOTSUPPORTED, "Winsock.dll out of range"),
E(WSANOTINITIALISED, "Successful WSAStartup not yet performed"),
E(WSAEDISCON, "Graceful shutdown now in progress"),
#ifdef WSATYPE_NOT_FOUND
E(WSATYPE_NOT_FOUND, "Class type not found"),
#endif
E(WSAHOST_NOT_FOUND, "Host not found"),
E(WSATRY_AGAIN, "Nonauthoritative host not found"),
E(WSANO_RECOVERY, "This is a nonrecoverable error"),
E(WSANO_DATA, "Valid name, no data record of requested type)"),
/* There are some more error codes whose numeric values are marked
* <b>OS dependent</b>. They start with WSA_, apparently for the same
* reason that practitioners of some craft traditions deliberately
* introduce imperfections into their baskets and rugs "to allow the
* evil spirits to escape." If we catch them, then our binaries
* might not report consistent results across versions of Windows.
* Thus, I'm going to let them all fall through.
*/
{ -1, NULL },
};
#undef E
/** Equivalent to strerror, but for windows socket errors. */
const char *
evutil_socket_error_to_string(int errcode)
{
/* XXXX Is there really no built-in function to do this? */
int i;
for (i=0; windows_socket_errors[i].code >= 0; ++i) {
if (errcode == windows_socket_errors[i].code)
return windows_socket_errors[i].msg;
}
return strerror(errcode);
}
#endif
int
evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
{
int r;
va_list ap;
va_start(ap, format);
r = evutil_vsnprintf(buf, buflen, format, ap);
va_end(ap);
return r;
}
int
evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap)
{
int r;
if (!buflen)
return 0;
#ifdef _MSC_VER
r = _vsnprintf(buf, buflen, format, ap);
if (r < 0)
r = _vscprintf(format, ap);
#else
r = vsnprintf(buf, buflen, format, ap);
#endif
buf[buflen-1] = '\0';
return r;
}
#define USE_INTERNAL_NTOP
#define USE_INTERNAL_PTON
const char *
evutil_inet_ntop(int af, const void *src, char *dst, size_t len)
{
#if defined(_EVENT_HAVE_INET_NTOP) && !defined(USE_INTERNAL_NTOP)
return inet_ntop(af, src, dst, len);
#else
if (af == AF_INET) {
const struct in_addr *in = src;
const ev_uint32_t a = ntohl(in->s_addr);
int r;
r = evutil_snprintf(dst, len, "%d.%d.%d.%d",
(int)(ev_uint8_t)((a>>24)&0xff),
(int)(ev_uint8_t)((a>>16)&0xff),
(int)(ev_uint8_t)((a>>8 )&0xff),
(int)(ev_uint8_t)((a )&0xff));
if (r<0||(size_t)r>=len)
return NULL;
else
return dst;
#ifdef AF_INET6
} else if (af == AF_INET6) {
const struct in6_addr *addr = src;
char buf[64], *cp;
int longestGapLen = 0, longestGapPos = -1, i,
curGapPos = -1, curGapLen = 0;
ev_uint16_t words[8];
for (i = 0; i < 8; ++i) {
words[i] =
(((ev_uint16_t)addr->s6_addr[2*i])<<8) + addr->s6_addr[2*i+1];
}
if (words[0] == 0 && words[1] == 0 && words[2] == 0 && words[3] == 0 &&
words[4] == 0 && ((words[5] == 0 && words[6] && words[7]) ||
(words[5] == 0xffff))) {
/* This is an IPv4 address. */
if (words[5] == 0) {
evutil_snprintf(buf, sizeof(buf), "::%d.%d.%d.%d",
addr->s6_addr[12], addr->s6_addr[13],
addr->s6_addr[14], addr->s6_addr[15]);
} else {
evutil_snprintf(buf, sizeof(buf), "::%x:%d.%d.%d.%d", words[5],
addr->s6_addr[12], addr->s6_addr[13],
addr->s6_addr[14], addr->s6_addr[15]);
}
if (strlen(buf) > len)
return NULL;
strlcpy(dst, buf, len);
return dst;
}
i = 0;
while (i < 8) {
if (words[i] == 0) {
curGapPos = i++;
curGapLen = 1;
while (i<8 && words[i] == 0) {
++i; ++curGapLen;
}
if (curGapLen > longestGapLen) {
longestGapPos = curGapPos;
longestGapLen = curGapLen;
}
} else {
++i;
}
}
if (longestGapLen<=1)
longestGapPos = -1;
cp = buf;
for (i = 0; i < 8; ++i) {
if (words[i] == 0 && longestGapPos == i) {
if (i == 0)
*cp++ = ':';
*cp++ = ':';
while (i < 8 && words[i] == 0)
++i;
--i; /* to compensate for loop increment. */
} else {
evutil_snprintf(cp,
sizeof(buf)-(cp-buf), "%x", (unsigned)words[i]);
cp += strlen(cp);
if (i != 7)
*cp++ = ':';
}
}
*cp = '\0';
if (strlen(buf) > len)
return NULL;
strlcpy(dst, buf, len);
return dst;
#endif
} else {
return NULL;
}
#endif
}
int
evutil_inet_pton(int af, const char *src, void *dst)
{
#if defined(_EVENT_HAVE_INET_PTON) && !defined(USE_INTERNAL_PTON)
return inet_pton(af, src, dst);
#else
if (af == AF_INET) {
int a,b,c,d;
char more;
struct in_addr *addr = dst;
if (sscanf(src, "%d.%d.%d.%d%c", &a,&b,&c,&d,&more) != 4)
return 0;
if (a < 0 || a > 255) return 0;
if (b < 0 || b > 255) return 0;
if (c < 0 || c > 255) return 0;
if (d < 0 || d > 255) return 0;
addr->s_addr = htonl((a<<24) | (b<<16) | (c<<8) | d);
return 1;
#ifdef AF_INET6
} else if (af == AF_INET6) {
struct in6_addr *out = dst;
ev_uint16_t words[8];
int gapPos = -1, i, setWords=0;
const char *dot = strchr(src, '.');
const char *eow; /* end of words. */
if (dot == src)
return 0;
else if (!dot)
eow = src+strlen(src);
else {
int byte1,byte2,byte3,byte4;
char more;
for (eow = dot-1; eow >= src && EVUTIL_ISDIGIT(*eow); --eow)
;
++eow;
/* We use "scanf" because some platform inet_aton()s are too lax
* about IPv4 addresses of the form "1.2.3" */
if (sscanf(eow, "%d.%d.%d.%d%c",
&byte1,&byte2,&byte3,&byte4,&more) != 4)
return 0;
if (byte1 > 255 || byte1 < 0 ||
byte2 > 255 || byte2 < 0 ||
byte3 > 255 || byte3 < 0 ||
byte4 > 255 || byte4 < 0)
return 0;
words[6] = (byte1<<8) | byte2;
words[7] = (byte3<<8) | byte4;
setWords += 2;
}
i = 0;
while (src < eow) {
if (i > 7)
return 0;
if (EVUTIL_ISXDIGIT(*src)) {
char *next;
long r = strtol(src, &next, 16);
if (next > 4+src)
return 0;
if (next == src)
return 0;
if (r<0 || r>65536)
return 0;
words[i++] = (ev_uint16_t)r;
setWords++;
src = next;
if (*src != ':' && src != eow)
return 0;
++src;
} else if (*src == ':' && i > 0 && gapPos==-1) {
gapPos = i;
++src;
} else if (*src == ':' && i == 0 && src[1] == ':' && gapPos==-1) {
gapPos = i;
src += 2;
} else {
return 0;
}
}
if (setWords > 8 ||
(setWords == 8 && gapPos != -1) ||
(setWords < 8 && gapPos == -1))
return 0;
if (gapPos >= 0) {
int nToMove = setWords - (dot ? 2 : 0) - gapPos;
int gapLen = 8 - setWords;
/* assert(nToMove >= 0); */
if (nToMove < 0)
return -1; /* should be impossible */
memmove(&words[gapPos+gapLen], &words[gapPos],
sizeof(ev_uint16_t)*nToMove);
memset(&words[gapPos], 0, sizeof(ev_uint16_t)*gapLen);
}
for (i = 0; i < 8; ++i) {
out->s6_addr[2*i ] = words[i] >> 8;
out->s6_addr[2*i+1] = words[i] & 0xff;
}
return 1;
#endif
} else {
return -1;
}
#endif
}
int
evutil_parse_sockaddr_port(const char *ip_as_string, struct sockaddr *out, int *outlen)
{
int port;
char buf[128];
const char *cp, *addr_part, *port_part;
int is_ipv6;
/* recognized formats are:
* [ipv6]:port
* ipv6
* [ipv6]
* ipv4:port
* ipv4
*/
cp = strchr(ip_as_string, ':');
if (*ip_as_string == '[') {
int len;
if (!(cp = strchr(ip_as_string, ']'))) {
return -1;
}
len = cp-(ip_as_string + 1);
if (len > (int)sizeof(buf)-1) {
return -1;
}
memcpy(buf, ip_as_string+1, len);
buf[len] = '\0';
addr_part = buf;
if (cp[1] == ':')
port_part = cp+2;
else
port_part = NULL;
is_ipv6 = 1;
} else if (cp && strchr(cp+1, ':')) {
is_ipv6 = 1;
addr_part = ip_as_string;
port_part = NULL;
} else if (cp) {
is_ipv6 = 0;
if (cp - ip_as_string > (int)sizeof(buf)-1) {
return -1;
}
memcpy(buf, ip_as_string, cp-ip_as_string);
buf[cp-ip_as_string] = '\0';
addr_part = buf;
port_part = cp+1;
} else {
addr_part = ip_as_string;
port_part = NULL;
is_ipv6 = 0;
}
if (port_part == NULL) {
port = 0;
} else {
port = atoi(port_part);
if (port <= 0 || port > 65535) {
return -1;
}
}
if (!addr_part)
return -1; /* Should be impossible. */
#ifdef AF_INET6
if (is_ipv6)
{
struct sockaddr_in6 sin6;
memset(&sin6, 0, sizeof(sin6));
#ifdef _EVENT_HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN
sin6.sin6_len = sizeof(sin6);
#endif
sin6.sin6_family = AF_INET6;
sin6.sin6_port = htons(port);
if (1 != evutil_inet_pton(AF_INET6, addr_part, &sin6.sin6_addr))
return -1;
if (sizeof(sin6) > *outlen)
return -1;
memset(out, 0, *outlen);
memcpy(out, &sin6, sizeof(sin6));
*outlen = sizeof(sin6);
return 0;
}
else
#endif
{
struct sockaddr_in sin;
memset(&sin, 0, sizeof(sin));
#ifdef _EVENT_HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
sin.sin_len = sizeof(sin);
#endif
sin.sin_family = AF_INET;
sin.sin_port = htons(port);
if (1 != evutil_inet_pton(AF_INET, addr_part, &sin.sin_addr))
return -1;
if (sizeof(sin) > *outlen)
return -1;
memset(out, 0, *outlen);
memcpy(out, &sin, sizeof(sin));
*outlen = sizeof(sin);
return 0;
}
}
const char *
evutil_format_sockaddr_port(const struct sockaddr *sa, char *out, size_t outlen)
{
char b[128];
const char *res=NULL;
int port;
if (sa->sa_family == AF_INET) {
const struct sockaddr_in *sin = (const struct sockaddr_in*)sa;
res = evutil_inet_ntop(AF_INET, &sin->sin_addr,b,sizeof(b));
port = ntohs(sin->sin_port);
if (res) {
evutil_snprintf(out, outlen, "%s:%d", b, port);
return out;
}
} else if (sa->sa_family == AF_INET6) {
const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6*)sa;
res = evutil_inet_ntop(AF_INET6, &sin6->sin6_addr,b,sizeof(b));
port = ntohs(sin6->sin6_port);
if (res) {
evutil_snprintf(out, outlen, "[%s]:%d", b, port);
return out;
}
}
evutil_snprintf(out, outlen, "<addr with socktype %d>",
(int)sa->sa_family);
return out;
}
int
evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
int include_port)
{
int r;
if (0 != (r = (sa1->sa_family - sa2->sa_family)))
return r;
if (sa1->sa_family == AF_INET) {
const struct sockaddr_in *sin1, *sin2;
sin1 = (const struct sockaddr_in *)sa1;
sin2 = (const struct sockaddr_in *)sa2;
if (sin1->sin_addr.s_addr < sin2->sin_addr.s_addr)
return -1;
else if (sin1->sin_addr.s_addr > sin2->sin_addr.s_addr)
return 1;
else if (include_port &&
(r = ((int)sin1->sin_port - (int)sin2->sin_port)))
return r;
else
return 0;
}
#ifdef AF_INET6
else if (sa1->sa_family == AF_INET6) {
const struct sockaddr_in6 *sin1, *sin2;
sin1 = (const struct sockaddr_in6 *)sa1;
sin2 = (const struct sockaddr_in6 *)sa2;
if ((r = memcmp(sin1->sin6_addr.s6_addr, sin2->sin6_addr.s6_addr, 16)))
return r;
else if (include_port &&
(r = ((int)sin1->sin6_port - (int)sin2->sin6_port)))
return r;
else
return 0;
}
#endif
return 1;
}
/* Tables to implement ctypes-replacement EVUTIL_IS*() functions. Each table
* has 256 bits to look up whether a character is in some set or not. This
* fails on non-ASCII platforms, but so does every other place where we
* take a char and write it onto the network.
**/
const ev_uint32_t EVUTIL_ISALPHA_TABLE[8] =
{ 0, 0, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 };
const ev_uint32_t EVUTIL_ISALNUM_TABLE[8] =
{ 0, 0x3ff0000, 0x7fffffe, 0x7fffffe, 0, 0, 0, 0 };
const ev_uint32_t EVUTIL_ISSPACE_TABLE[8] = { 0x3e00, 0x1, 0, 0, 0, 0, 0, 0 };
const ev_uint32_t EVUTIL_ISXDIGIT_TABLE[8] =
{ 0, 0x3ff0000, 0x7e, 0x7e, 0, 0, 0, 0 };
const ev_uint32_t EVUTIL_ISDIGIT_TABLE[8] = { 0, 0x3ff0000, 0, 0, 0, 0, 0, 0 };
const ev_uint32_t EVUTIL_ISPRINT_TABLE[8] =
{ 0, 0xffffffff, 0xffffffff, 0x7fffffff, 0, 0, 0, 0x0 };
const ev_uint32_t EVUTIL_ISUPPER_TABLE[8] = { 0, 0, 0x7fffffe, 0, 0, 0, 0, 0 };
const ev_uint32_t EVUTIL_ISLOWER_TABLE[8] = { 0, 0, 0, 0x7fffffe, 0, 0, 0, 0 };
/* Upper-casing and lowercasing tables to map characters to upper/lowercase
* equivalents. */
const unsigned char EVUTIL_TOUPPER_TABLE[256] = {
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
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,
96,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,
80,81,82,83,84,85,86,87,88,89,90,123,124,125,126,127,
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,
};
const unsigned char EVUTIL_TOLOWER_TABLE[256] = {
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
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,
64,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,
112,113,114,115,116,117,118,119,120,121,122,91,92,93,94,95,
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,
};
int
evutil_ascii_strcasecmp(const char *s1, const char *s2)
{
char c1, c2;
while (1) {
c1 = EVUTIL_TOLOWER(*s1++);
c2 = EVUTIL_TOLOWER(*s2++);
if (c1 < c2)
return -1;
else if (c1 > c2)
return 1;
else if (c1 == 0)
return 0;
}
}
int evutil_ascii_strncasecmp(const char *s1, const char *s2, size_t n)
{
char c1, c2;
while (n--) {
c1 = EVUTIL_TOLOWER(*s1++);
c2 = EVUTIL_TOLOWER(*s2++);
if (c1 < c2)
return -1;
else if (c1 > c2)
return 1;
else if (c1 == 0)
return 0;
}
return 0;
}
static int
evutil_issetugid(void)
{
#ifdef _EVENT_HAVE_ISSETUGID
return issetugid();
#else
#ifdef _EVENT_HAVE_GETEUID
if (getuid() != geteuid())
return 1;
#endif
#ifdef _EVENT_HAVE_GETEGID
if (getgid() != getegid())
return 1;
#endif
return 0;
#endif
}
const char *
evutil_getenv(const char *varname)
{
if (evutil_issetugid())
return NULL;
return getenv(varname);
}
long
_evutil_weakrand(void)
{
#ifdef WIN32
return rand();
#else
return random();
#endif
}
int
evutil_sockaddr_is_loopback(const struct sockaddr *addr)
{
static const char LOOPBACK_S6[16] =
"\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1";
if (addr->sa_family == AF_INET) {
struct sockaddr_in *sin = (struct sockaddr_in *)addr;
return (ntohl(sin->sin_addr.s_addr) & 0xff000000) == 0x7f000000;
} else if (addr->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
return !memcmp(sin6->sin6_addr.s6_addr, LOOPBACK_S6, 16);
}
return 0;
}
#define MAX_SECONDS_IN_MSEC_LONG \
(((LONG_MAX) - 999) / 1000)
long
evutil_tv_to_msec(const struct timeval *tv)
{
if (tv->tv_usec > 1000000 || tv->tv_sec > MAX_SECONDS_IN_MSEC_LONG)
return -1;
return (tv->tv_sec * 1000) + ((tv->tv_usec + 999) / 1000);
}
int
evutil_hex_char_to_int(char c)
{
switch(c)
{
case '0': return 0;
case '1': return 1;
case '2': return 2;
case '3': return 3;
case '4': return 4;
case '5': return 5;
case '6': return 6;
case '7': return 7;
case '8': return 8;
case '9': return 9;
case 'A': case 'a': return 10;
case 'B': case 'b': return 11;
case 'C': case 'c': return 12;
case 'D': case 'd': return 13;
case 'E': case 'e': return 14;
case 'F': case 'f': return 15;
}
return -1;
}
|