/usr/lib/perl5/Sys/Syslog.pm is in libsys-syslog-perl 0.33-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | package Sys::Syslog;
use strict;
use warnings;
use warnings::register;
use Carp;
use Exporter qw< import >;
use File::Basename;
use POSIX qw< strftime setlocale LC_TIME >;
use Socket qw< :all >;
require 5.005;
{ no strict 'vars';
$VERSION = '0.33';
%EXPORT_TAGS = (
standard => [qw(openlog syslog closelog setlogmask)],
extended => [qw(setlogsock)],
macros => [
# levels
qw(
LOG_ALERT LOG_CRIT LOG_DEBUG LOG_EMERG LOG_ERR
LOG_INFO LOG_NOTICE LOG_WARNING
),
# standard facilities
qw(
LOG_AUTH LOG_AUTHPRIV LOG_CRON LOG_DAEMON LOG_FTP LOG_KERN
LOG_LOCAL0 LOG_LOCAL1 LOG_LOCAL2 LOG_LOCAL3 LOG_LOCAL4
LOG_LOCAL5 LOG_LOCAL6 LOG_LOCAL7 LOG_LPR LOG_MAIL LOG_NEWS
LOG_SYSLOG LOG_USER LOG_UUCP
),
# Mac OS X specific facilities
qw( LOG_INSTALL LOG_LAUNCHD LOG_NETINFO LOG_RAS LOG_REMOTEAUTH ),
# modern BSD specific facilities
qw( LOG_CONSOLE LOG_NTP LOG_SECURITY ),
# IRIX specific facilities
qw( LOG_AUDIT LOG_LFMT ),
# options
qw(
LOG_CONS LOG_PID LOG_NDELAY LOG_NOWAIT LOG_ODELAY LOG_PERROR
),
# others macros
qw(
LOG_FACMASK LOG_NFACILITIES LOG_PRIMASK
LOG_MASK LOG_UPTO
),
],
);
@EXPORT = (
@{$EXPORT_TAGS{standard}},
);
@EXPORT_OK = (
@{$EXPORT_TAGS{extended}},
@{$EXPORT_TAGS{macros}},
);
eval {
require XSLoader;
XSLoader::load('Sys::Syslog', $VERSION);
1
} or do {
require DynaLoader;
push @ISA, 'DynaLoader';
bootstrap Sys::Syslog $VERSION;
};
}
#
# Public variables
#
use vars qw($host); # host to send syslog messages to (see notes at end)
#
# Prototypes
#
sub silent_eval (&);
#
# Global variables
#
use vars qw($facility);
my $connected = 0; # flag to indicate if we're connected or not
my $syslog_send; # coderef of the function used to send messages
my $syslog_path = undef; # syslog path for "stream" and "unix" mechanisms
my $syslog_xobj = undef; # if defined, holds the external object used to send messages
my $transmit_ok = 0; # flag to indicate if the last message was transmitted
my $sock_port = undef; # socket port
my $sock_timeout = 0; # socket timeout, see below
my $current_proto = undef; # current mechanism used to transmit messages
my $ident = ''; # identifiant prepended to each message
$facility = ''; # current facility
my $maskpri = LOG_UPTO(&LOG_DEBUG); # current log mask
my %options = (
ndelay => 0,
noeol => 0,
nofatal => 0,
nonul => 0,
nowait => 0,
perror => 0,
pid => 0,
);
# Default is now to first use the native mechanism, so Perl programs
# behave like other normal Unix programs, then try other mechanisms.
my @connectMethods = qw(native tcp udp unix pipe stream console);
if ($^O eq "freebsd" or $^O eq "linux") {
@connectMethods = grep { $_ ne 'udp' } @connectMethods;
}
# And on Win32 systems, we try to use the native mechanism for this
# platform, the events logger, available through Win32::EventLog.
EVENTLOG: {
my $is_Win32 = $^O =~ /Win32/i;
if (can_load("Sys::Syslog::Win32", $is_Win32)) {
unshift @connectMethods, 'eventlog';
}
}
my @defaultMethods = @connectMethods;
my @fallbackMethods = ();
# The timeout in connection_ok() was pushed up to 0.25 sec in
# Sys::Syslog v0.19 in order to address a heisenbug on MacOSX:
# http://london.pm.org/pipermail/london.pm/Week-of-Mon-20061211/005961.html
#
# However, this also had the effect of slowing this test for
# all other operating systems, which apparently impacted some
# users (cf. CPAN-RT #34753). So, in order to make everybody
# happy, the timeout is now zero by default on all systems
# except on OSX where it is set to 250 msec, and can be set
# with the infamous setlogsock() function.
#
# Update 2011-08: this issue is also been seen on multiprocessor
# Debian GNU/kFreeBSD systems. See http://bugs.debian.org/627821
# and https://rt.cpan.org/Ticket/Display.html?id=69997
# Also, lowering the delay to 1 ms, which should be enough.
$sock_timeout = 0.001 if $^O =~ /darwin|gnukfreebsd/;
# Perl 5.6.0's warnings.pm doesn't have warnings::warnif()
if (not defined &warnings::warnif) {
*warnings::warnif = sub {
goto &warnings::warn if warnings::enabled(__PACKAGE__)
}
}
# coderef for a nicer handling of errors
my $err_sub = $options{nofatal} ? \&warnings::warnif : \&croak;
sub AUTOLOAD {
# This AUTOLOAD is used to 'autoload' constants from the constant()
# XS function.
no strict 'vars';
my $constname;
($constname = $AUTOLOAD) =~ s/.*:://;
croak "Sys::Syslog::constant() not defined" if $constname eq 'constant';
my ($error, $val) = constant($constname);
croak $error if $error;
no strict 'refs';
*$AUTOLOAD = sub { $val };
goto &$AUTOLOAD;
}
sub openlog {
($ident, my $logopt, $facility) = @_;
# default values
$ident ||= basename($0) || getlogin() || getpwuid($<) || 'syslog';
$logopt ||= '';
$facility ||= LOG_USER();
for my $opt (split /\b/, $logopt) {
$options{$opt} = 1 if exists $options{$opt}
}
$err_sub = delete $options{nofatal} ? \&warnings::warnif : \&croak;
return 1 unless $options{ndelay};
connect_log();
}
sub closelog {
disconnect_log() if $connected;
$options{$_} = 0 for keys %options;
$facility = $ident = "";
$connected = 0;
return 1
}
sub setlogmask {
my $oldmask = $maskpri;
$maskpri = shift unless $_[0] == 0;
$oldmask;
}
my %mechanism = (
console => {
check => sub { 1 },
},
eventlog => {
check => sub { return can_load("Win32::EventLog") },
err_msg => "no Win32 API available",
},
inet => {
check => sub { 1 },
},
native => {
check => sub { 1 },
},
pipe => {
check => sub {
($syslog_path) = grep { defined && length && -p && -w _ }
$syslog_path, &_PATH_LOG, "/dev/log";
return $syslog_path ? 1 : 0
},
err_msg => "path not available",
},
stream => {
check => sub {
if (not defined $syslog_path) {
my @try = qw(/dev/log /dev/conslog);
unshift @try, &_PATH_LOG if length &_PATH_LOG;
($syslog_path) = grep { -w } @try;
}
return defined $syslog_path && -w $syslog_path
},
err_msg => "could not find any writable device",
},
tcp => {
check => sub {
return 1 if defined $sock_port;
if (getservbyname('syslog', 'tcp') || getservbyname('syslogng', 'tcp')) {
$host = $syslog_path;
return 1
}
else {
return
}
},
err_msg => "TCP service unavailable",
},
udp => {
check => sub {
return 1 if defined $sock_port;
if (getservbyname('syslog', 'udp')) {
$host = $syslog_path;
return 1
}
else {
return
}
},
err_msg => "UDP service unavailable",
},
unix => {
check => sub {
my @try = ($syslog_path, &_PATH_LOG);
($syslog_path) = grep { defined && length && -w } @try;
return defined $syslog_path && -w $syslog_path
},
err_msg => "path not available",
},
);
sub setlogsock {
my %opt;
# handle arguments
# - old API: setlogsock($sock_type, $sock_path, $sock_timeout)
# - new API: setlogsock(\%options)
croak "setlogsock(): Invalid number of arguments"
unless @_ >= 1 and @_ <= 3;
if (my $ref = ref $_[0]) {
if ($ref eq "HASH") {
%opt = %{ $_[0] };
croak "setlogsock(): No argument given" unless keys %opt;
}
elsif ($ref eq "ARRAY") {
@opt{qw< type path timeout >} = @_;
}
else {
croak "setlogsock(): Unexpected \L$ref\E reference"
}
}
else {
@opt{qw< type path timeout >} = @_;
}
# check socket type, remove invalid ones
my $diag_invalid_type = "setlogsock(): Invalid type%s; must be one of "
. join ", ", map { "'$_'" } sort keys %mechanism;
croak sprintf $diag_invalid_type, "" unless defined $opt{type};
my @sock_types = ref $opt{type} eq "ARRAY" ? @{$opt{type}} : ($opt{type});
my @tmp;
for my $sock_type (@sock_types) {
carp sprintf $diag_invalid_type, " '$sock_type'" and next
unless exists $mechanism{$sock_type};
push @tmp, "tcp", "udp" and next if $sock_type eq "inet";
push @tmp, $sock_type;
}
@sock_types = @tmp;
# set global options
$syslog_path = $opt{path} if defined $opt{path};
$host = $opt{host} if defined $opt{host};
$sock_timeout = $opt{timeout} if defined $opt{timeout};
$sock_port = $opt{port} if defined $opt{port};
disconnect_log() if $connected;
$transmit_ok = 0;
@fallbackMethods = ();
@connectMethods = ();
my $found = 0;
# check each given mechanism and test if it can be used on the current system
for my $sock_type (@sock_types) {
if ( $mechanism{$sock_type}{check}->() ) {
push @connectMethods, $sock_type;
$found = 1;
}
else {
warnings::warnif("setlogsock(): type='$sock_type': "
. $mechanism{$sock_type}{err_msg});
}
}
# if no mechanism worked from the given ones, use the default ones
@connectMethods = @defaultMethods unless @connectMethods;
return $found;
}
sub syslog {
my ($priority, $mask, @args) = @_;
my ($message, $buf);
my (@words, $num, $numpri, $numfac, $sum);
my $failed = undef;
my $fail_time = undef;
my $error = $!;
# if $ident is undefined, it means openlog() wasn't previously called
# so do it now in order to have sensible defaults
openlog() unless $ident;
local $facility = $facility; # may need to change temporarily.
croak "syslog: expecting argument \$priority" unless defined $priority;
croak "syslog: expecting argument \$format" unless defined $mask;
if ($priority =~ /^\d+$/) {
$numpri = LOG_PRI($priority);
$numfac = LOG_FAC($priority) << 3;
}
elsif ($priority =~ /^\w+/) {
# Allow "level" or "level|facility".
@words = split /\W+/, $priority, 2;
undef $numpri;
undef $numfac;
for my $word (@words) {
next if length $word == 0;
# Translate word to number.
$num = xlate($word);
if ($num < 0) {
croak "syslog: invalid level/facility: $word"
}
elsif ($num <= LOG_PRIMASK() and $word ne "kern") {
croak "syslog: too many levels given: $word"
if defined $numpri;
$numpri = $num;
}
else {
croak "syslog: too many facilities given: $word"
if defined $numfac;
$facility = $word if $word =~ /^[A-Za-z]/;
$numfac = $num;
}
}
}
else {
croak "syslog: invalid level/facility: $priority"
}
croak "syslog: level must be given" unless defined $numpri;
# don't log if priority is below mask level
return 0 unless LOG_MASK($numpri) & $maskpri;
if (not defined $numfac) { # Facility not specified in this call.
$facility = 'user' unless $facility;
$numfac = xlate($facility);
}
connect_log() unless $connected;
if ($mask =~ /%m/) {
# escape percent signs for sprintf()
$error =~ s/%/%%/g if @args;
# replace %m with $error, if preceded by an even number of percent signs
$mask =~ s/(?<!%)((?:%%)*)%m/$1$error/g;
}
$mask .= "\n" unless $mask =~ /\n$/;
$message = @args ? sprintf($mask, @args) : $mask;
if ($current_proto eq 'native') {
$buf = $message;
}
elsif ($current_proto eq 'eventlog') {
$buf = $message;
}
else {
my $whoami = $ident;
$whoami .= "[$$]" if $options{pid};
$sum = $numpri + $numfac;
my $oldlocale = setlocale(LC_TIME);
setlocale(LC_TIME, 'C');
my $timestamp = strftime "%b %d %H:%M:%S", localtime;
setlocale(LC_TIME, $oldlocale);
# construct the stream that will be transmitted
$buf = "<$sum>$timestamp $whoami: $message";
# add (or not) a newline
$buf .= "\n" if !$options{noeol} and rindex($buf, "\n") == -1;
# add (or not) a NUL character
$buf .= "\0" if !$options{nonul};
}
# handle PERROR option
# "native" mechanism already handles it by itself
if ($options{perror} and $current_proto ne 'native') {
my $whoami = $ident;
$whoami .= "[$$]" if $options{pid};
print STDERR "$whoami: $message\n";
}
# it's possible that we'll get an error from sending
# (e.g. if method is UDP and there is no UDP listener,
# then we'll get ECONNREFUSED on the send). So what we
# want to do at this point is to fallback onto a different
# connection method.
while (scalar @fallbackMethods || $syslog_send) {
if ($failed && (time - $fail_time) > 60) {
# it's been a while... maybe things have been fixed
@fallbackMethods = ();
disconnect_log();
$transmit_ok = 0; # make it look like a fresh attempt
connect_log();
}
if ($connected && !connection_ok()) {
# Something was OK, but has now broken. Remember coz we'll
# want to go back to what used to be OK.
$failed = $current_proto unless $failed;
$fail_time = time;
disconnect_log();
}
connect_log() unless $connected;
$failed = undef if ($current_proto && $failed && $current_proto eq $failed);
if ($syslog_send) {
if ($syslog_send->($buf, $numpri, $numfac)) {
$transmit_ok++;
return 1;
}
# typically doesn't happen, since errors are rare from write().
disconnect_log();
}
}
# could not send, could not fallback onto a working
# connection method. Lose.
return 0;
}
sub _syslog_send_console {
my ($buf) = @_;
# The console print is a method which could block
# so we do it in a child process and always return success
# to the caller.
if (my $pid = fork) {
if ($options{nowait}) {
return 1;
} else {
if (waitpid($pid, 0) >= 0) {
return ($? >> 8);
} else {
# it's possible that the caller has other
# plans for SIGCHLD, so let's not interfere
return 1;
}
}
} else {
if (open(CONS, ">/dev/console")) {
my $ret = print CONS $buf . "\r"; # XXX: should this be \x0A ?
POSIX::_exit($ret) if defined $pid;
close CONS;
}
POSIX::_exit(0) if defined $pid;
}
}
sub _syslog_send_stream {
my ($buf) = @_;
# XXX: this only works if the OS stream implementation makes a write
# look like a putmsg() with simple header. For instance it works on
# Solaris 8 but not Solaris 7.
# To be correct, it should use a STREAMS API, but perl doesn't have one.
return syswrite(SYSLOG, $buf, length($buf));
}
sub _syslog_send_pipe {
my ($buf) = @_;
return print SYSLOG $buf;
}
sub _syslog_send_socket {
my ($buf) = @_;
return syswrite(SYSLOG, $buf, length($buf));
#return send(SYSLOG, $buf, 0);
}
sub _syslog_send_native {
my ($buf, $numpri, $numfac) = @_;
syslog_xs($numpri|$numfac, $buf);
return 1;
}
# xlate()
# -----
# private function to translate names to numeric values
#
sub xlate {
my ($name) = @_;
return $name+0 if $name =~ /^\s*\d+\s*$/;
$name = uc $name;
$name = "LOG_$name" unless $name =~ /^LOG_/;
# ExtUtils::Constant 0.20 introduced a new way to implement
# constants, called ProxySubs. When it was used to generate
# the C code, the constant() function no longer returns the
# correct value. Therefore, we first try a direct call to
# constant(), and if the value is an error we try to call the
# constant by its full name.
my $value = constant($name);
if (index($value, "not a valid") >= 0) {
$name = "Sys::Syslog::$name";
$value = eval { no strict "refs"; &$name };
$value = $@ unless defined $value;
}
$value = -1 if index($value, "not a valid") >= 0;
return defined $value ? $value : -1;
}
# connect_log()
# -----------
# This function acts as a kind of front-end: it tries to connect to
# a syslog service using the selected methods, trying each one in the
# selected order.
#
sub connect_log {
@fallbackMethods = @connectMethods unless scalar @fallbackMethods;
if ($transmit_ok && $current_proto) {
# Retry what we were on, because it has worked in the past.
unshift(@fallbackMethods, $current_proto);
}
$connected = 0;
my @errs = ();
my $proto = undef;
while ($proto = shift @fallbackMethods) {
no strict 'refs';
my $fn = "connect_$proto";
$connected = &$fn(\@errs) if defined &$fn;
last if $connected;
}
$transmit_ok = 0;
if ($connected) {
$current_proto = $proto;
my ($old) = select(SYSLOG); $| = 1; select($old);
} else {
@fallbackMethods = ();
$err_sub->(join "\n\t- ", "no connection to syslog available", @errs);
return undef;
}
}
sub connect_tcp {
my ($errs) = @_;
my $proto = getprotobyname('tcp');
if (!defined $proto) {
push @$errs, "getprotobyname failed for tcp";
return 0;
}
my $port = $sock_port || getservbyname('syslog', 'tcp');
$port = getservbyname('syslogng', 'tcp') unless defined $port;
if (!defined $port) {
push @$errs, "getservbyname failed for syslog/tcp and syslogng/tcp";
return 0;
}
my $addr;
if (defined $host) {
$addr = inet_aton($host);
if (!$addr) {
push @$errs, "can't lookup $host";
return 0;
}
} else {
$addr = INADDR_LOOPBACK;
}
$addr = sockaddr_in($port, $addr);
if (!socket(SYSLOG, AF_INET, SOCK_STREAM, $proto)) {
push @$errs, "tcp socket: $!";
return 0;
}
setsockopt(SYSLOG, SOL_SOCKET, SO_KEEPALIVE, 1);
if (silent_eval { IPPROTO_TCP() }) {
# These constants don't exist in 5.005. They were added in 1999
setsockopt(SYSLOG, IPPROTO_TCP(), TCP_NODELAY(), 1);
}
if (!connect(SYSLOG, $addr)) {
push @$errs, "tcp connect: $!";
return 0;
}
$syslog_send = \&_syslog_send_socket;
return 1;
}
sub connect_udp {
my ($errs) = @_;
my $proto = getprotobyname('udp');
if (!defined $proto) {
push @$errs, "getprotobyname failed for udp";
return 0;
}
my $port = $sock_port || getservbyname('syslog', 'udp');
if (!defined $port) {
push @$errs, "getservbyname failed for syslog/udp";
return 0;
}
my $addr;
if (defined $host) {
$addr = inet_aton($host);
if (!$addr) {
push @$errs, "can't lookup $host";
return 0;
}
} else {
$addr = INADDR_LOOPBACK;
}
$addr = sockaddr_in($port, $addr);
if (!socket(SYSLOG, AF_INET, SOCK_DGRAM, $proto)) {
push @$errs, "udp socket: $!";
return 0;
}
if (!connect(SYSLOG, $addr)) {
push @$errs, "udp connect: $!";
return 0;
}
# We want to check that the UDP connect worked. However the only
# way to do that is to send a message and see if an ICMP is returned
_syslog_send_socket("");
if (!connection_ok()) {
push @$errs, "udp connect: nobody listening";
return 0;
}
$syslog_send = \&_syslog_send_socket;
return 1;
}
sub connect_stream {
my ($errs) = @_;
# might want syslog_path to be variable based on syslog.h (if only
# it were in there!)
$syslog_path = '/dev/conslog' unless defined $syslog_path;
if (!-w $syslog_path) {
push @$errs, "stream $syslog_path is not writable";
return 0;
}
require Fcntl;
if (!sysopen(SYSLOG, $syslog_path, Fcntl::O_WRONLY(), 0400)) {
push @$errs, "stream can't open $syslog_path: $!";
return 0;
}
$syslog_send = \&_syslog_send_stream;
return 1;
}
sub connect_pipe {
my ($errs) = @_;
$syslog_path ||= &_PATH_LOG || "/dev/log";
if (not -w $syslog_path) {
push @$errs, "$syslog_path is not writable";
return 0;
}
if (not open(SYSLOG, ">$syslog_path")) {
push @$errs, "can't write to $syslog_path: $!";
return 0;
}
$syslog_send = \&_syslog_send_pipe;
return 1;
}
sub connect_unix {
my ($errs) = @_;
$syslog_path ||= _PATH_LOG() if length _PATH_LOG();
if (not defined $syslog_path) {
push @$errs, "_PATH_LOG not available in syslog.h and no user-supplied socket path";
return 0;
}
if (not (-S $syslog_path or -c _)) {
push @$errs, "$syslog_path is not a socket";
return 0;
}
my $addr = sockaddr_un($syslog_path);
if (!$addr) {
push @$errs, "can't locate $syslog_path";
return 0;
}
if (!socket(SYSLOG, AF_UNIX, SOCK_STREAM, 0)) {
push @$errs, "unix stream socket: $!";
return 0;
}
if (!connect(SYSLOG, $addr)) {
if (!socket(SYSLOG, AF_UNIX, SOCK_DGRAM, 0)) {
push @$errs, "unix dgram socket: $!";
return 0;
}
if (!connect(SYSLOG, $addr)) {
push @$errs, "unix dgram connect: $!";
return 0;
}
}
$syslog_send = \&_syslog_send_socket;
return 1;
}
sub connect_native {
my ($errs) = @_;
my $logopt = 0;
# reconstruct the numeric equivalent of the options
for my $opt (keys %options) {
$logopt += xlate($opt) if $options{$opt}
}
openlog_xs($ident, $logopt, xlate($facility));
$syslog_send = \&_syslog_send_native;
return 1;
}
sub connect_eventlog {
my ($errs) = @_;
$syslog_xobj = Sys::Syslog::Win32::_install();
$syslog_send = \&Sys::Syslog::Win32::_syslog_send;
return 1;
}
sub connect_console {
my ($errs) = @_;
if (!-w '/dev/console') {
push @$errs, "console is not writable";
return 0;
}
$syslog_send = \&_syslog_send_console;
return 1;
}
# To test if the connection is still good, we need to check if any
# errors are present on the connection. The errors will not be raised
# by a write. Instead, sockets are made readable and the next read
# would cause the error to be returned. Unfortunately the syslog
# 'protocol' never provides anything for us to read. But with
# judicious use of select(), we can see if it would be readable...
sub connection_ok {
return 1 if defined $current_proto and (
$current_proto eq 'native' or $current_proto eq 'console'
or $current_proto eq 'eventlog'
);
my $rin = '';
vec($rin, fileno(SYSLOG), 1) = 1;
my $ret = select $rin, undef, $rin, $sock_timeout;
return ($ret ? 0 : 1);
}
sub disconnect_log {
$connected = 0;
$syslog_send = undef;
if (defined $current_proto and $current_proto eq 'native') {
closelog_xs();
unshift @fallbackMethods, $current_proto;
$current_proto = undef;
return 1;
}
elsif (defined $current_proto and $current_proto eq 'eventlog') {
$syslog_xobj->Close();
unshift @fallbackMethods, $current_proto;
$current_proto = undef;
return 1;
}
return close SYSLOG;
}
#
# Wrappers around eval() that makes sure that nobody, and I say NOBODY,
# ever knows that I wanted to test if something was here or not.
# It is needed because some applications are trying to be too smart,
# do it wrong, and it ends up in EPIC FAIL.
# Yes I'm speaking of YOU, SpamAssassin.
#
sub silent_eval (&) {
local($SIG{__DIE__}, $SIG{__WARN__}, $@);
return eval { $_[0]->() }
}
sub can_load {
my ($module, $verbose) = @_;
local($SIG{__DIE__}, $SIG{__WARN__}, $@);
my $loaded = eval "use $module; 1";
warn $@ if not $loaded and $verbose;
return $loaded
}
"Eighth Rule: read the documentation."
__END__
=head1 NAME
Sys::Syslog - Perl interface to the UNIX syslog(3) calls
=head1 VERSION
This is the documentation of version 0.33
=head1 SYNOPSIS
use Sys::Syslog; # all except setlogsock()
use Sys::Syslog qw(:standard :macros); # standard functions & macros
openlog($ident, $logopt, $facility); # don't forget this
syslog($priority, $format, @args);
$oldmask = setlogmask($mask_priority);
closelog();
=head1 DESCRIPTION
C<Sys::Syslog> is an interface to the UNIX C<syslog(3)> program.
Call C<syslog()> with a string priority and a list of C<printf()> args
just like C<syslog(3)>.
=head1 EXPORTS
C<Sys::Syslog> exports the following C<Exporter> tags:
=over 4
=item *
C<:standard> exports the standard C<syslog(3)> functions:
openlog closelog setlogmask syslog
=item *
C<:extended> exports the Perl specific functions for C<syslog(3)>:
setlogsock
=item *
C<:macros> exports the symbols corresponding to most of your C<syslog(3)>
macros and the C<LOG_UPTO()> and C<LOG_MASK()> functions.
See L<"CONSTANTS"> for the supported constants and their meaning.
=back
By default, C<Sys::Syslog> exports the symbols from the C<:standard> tag.
=head1 FUNCTIONS
=over 4
=item B<openlog($ident, $logopt, $facility)>
Opens the syslog.
C<$ident> is prepended to every message. C<$logopt> contains zero or
more of the options detailed below. C<$facility> specifies the part
of the system to report about, for example C<LOG_USER> or C<LOG_LOCAL0>:
see L<"Facilities"> for a list of well-known facilities, and your
C<syslog(3)> documentation for the facilities available in your system.
Check L<"SEE ALSO"> for useful links. Facility can be given as a string
or a numeric macro.
This function will croak if it can't connect to the syslog daemon.
Note that C<openlog()> now takes three arguments, just like C<openlog(3)>.
B<You should use C<openlog()> before calling C<syslog()>.>
B<Options>
=over 4
=item *
C<cons> - This option is ignored, since the failover mechanism will drop
down to the console automatically if all other media fail.
=item *
C<ndelay> - Open the connection immediately (normally, the connection is
opened when the first message is logged).
=item *
C<noeol> - When set to true, no end of line character (C<\n>) will be
appended to the message. This can be useful for some buggy syslog daemons.
=item *
C<nofatal> - When set to true, C<openlog()> and C<syslog()> will only
emit warnings instead of dying if the connection to the syslog can't
be established.
=item *
C<nonul> - When set to true, no C<NUL> character (C<\0>) will be
appended to the message. This can be useful for some buggy syslog daemons.
=item *
C<nowait> - Don't wait for child processes that may have been created
while logging the message. (The GNU C library does not create a child
process, so this option has no effect on Linux.)
=item *
C<perror> - Write the message to standard error output as well to the
system log (added in C<Sys::Syslog> 0.22).
=item *
C<pid> - Include PID with each message.
=back
B<Examples>
Open the syslog with options C<ndelay> and C<pid>, and with facility C<LOCAL0>:
openlog($name, "ndelay,pid", "local0");
Same thing, but this time using the macro corresponding to C<LOCAL0>:
openlog($name, "ndelay,pid", LOG_LOCAL0);
=item B<syslog($priority, $message)>
=item B<syslog($priority, $format, @args)>
If C<$priority> permits, logs C<$message> or C<sprintf($format, @args)>
with the addition that C<%m> in $message or C<$format> is replaced with
C<"$!"> (the latest error message).
C<$priority> can specify a level, or a level and a facility. Levels and
facilities can be given as strings or as macros. When using the C<eventlog>
mechanism, priorities C<DEBUG> and C<INFO> are mapped to event type
C<informational>, C<NOTICE> and C<WARNING> to C<warning> and C<ERR> to
C<EMERG> to C<error>.
If you didn't use C<openlog()> before using C<syslog()>, C<syslog()> will
try to guess the C<$ident> by extracting the shortest prefix of
C<$format> that ends in a C<":">.
B<Examples>
# informational level
syslog("info", $message);
syslog(LOG_INFO, $message);
# information level, Local0 facility
syslog("info|local0", $message);
syslog(LOG_INFO|LOG_LOCAL0, $message);
=over 4
=item B<Note>
C<Sys::Syslog> version v0.07 and older passed the C<$message> as the
formatting string to C<sprintf()> even when no formatting arguments
were provided. If the code calling C<syslog()> might execute with
older versions of this module, make sure to call the function as
C<syslog($priority, "%s", $message)> instead of C<syslog($priority,
$message)>. This protects against hostile formatting sequences that
might show up if $message contains tainted data.
=back
=item B<setlogmask($mask_priority)>
Sets the log mask for the current process to C<$mask_priority> and
returns the old mask. If the mask argument is 0, the current log mask
is not modified. See L<"Levels"> for the list of available levels.
You can use the C<LOG_UPTO()> function to allow all levels up to a
given priority (but it only accept the numeric macros as arguments).
B<Examples>
Only log errors:
setlogmask( LOG_MASK(LOG_ERR) );
Log everything except informational messages:
setlogmask( ~(LOG_MASK(LOG_INFO)) );
Log critical messages, errors and warnings:
setlogmask( LOG_MASK(LOG_CRIT)
| LOG_MASK(LOG_ERR)
| LOG_MASK(LOG_WARNING) );
Log all messages up to debug:
setlogmask( LOG_UPTO(LOG_DEBUG) );
=item B<setlogsock()>
Sets the socket type and options to be used for the next call to C<openlog()>
or C<syslog()>. Returns true on success, C<undef> on failure.
Being Perl-specific, this function has evolved along time. It can currently
be called as follow:
=over
=item *
C<setlogsock($sock_type)>
=item *
C<setlogsock($sock_type, $stream_location)> (added in Perl 5.004_02)
=item *
C<setlogsock($sock_type, $stream_location, $sock_timeout)> (added in
C<Sys::Syslog> 0.25)
=item *
C<setlogsock(\%options)> (added in C<Sys::Syslog> 0.28)
=back
The available options are:
=over
=item *
C<type> - equivalent to C<$sock_type>, selects the socket type (or
"mechanism"). An array reference can be passed to specify several
mechanisms to try, in the given order.
=item *
C<path> - equivalent to C<$stream_location>, sets the stream location.
Defaults to standard Unix location, or C<_PATH_LOG>.
=item *
C<timeout> - equivalent to C<$sock_timeout>, sets the socket timeout
in seconds. Defaults to 0 on all systems except S<Mac OS X> where it
is set to 0.25 sec.
=item *
C<host> - sets the hostname to send the messages to. Defaults to
the local host.
=item *
C<port> - sets the TCP or UDP port to connect to. Defaults to the
first standard syslog port available on the system.
=back
The available mechanisms are:
=over
=item *
C<"native"> - use the native C functions from your C<syslog(3)> library
(added in C<Sys::Syslog> 0.15).
=item *
C<"eventlog"> - send messages to the Win32 events logger (Win32 only;
added in C<Sys::Syslog> 0.19).
=item *
C<"tcp"> - connect to a TCP socket, on the C<syslog/tcp> or C<syslogng/tcp>
service. See also the C<host>, C<port> and C<timeout> options.
=item *
C<"udp"> - connect to a UDP socket, on the C<syslog/udp> service.
See also the C<host>, C<port> and C<timeout> options.
=item *
C<"inet"> - connect to an INET socket, either TCP or UDP, tried in that
order. See also the C<host>, C<port> and C<timeout> options.
=item *
C<"unix"> - connect to a UNIX domain socket (in some systems a character
special device). The name of that socket is given by the C<path> option
or, if omitted, the value returned by the C<_PATH_LOG> macro (if your
system defines it), F</dev/log> or F</dev/conslog>, whichever is writable.
=item *
C<"stream"> - connect to the stream indicated by the C<path> option, or,
if omitted, the value returned by the C<_PATH_LOG> macro (if your system
defines it), F</dev/log> or F</dev/conslog>, whichever is writable. For
example Solaris and IRIX system may prefer C<"stream"> instead of C<"unix">.
=item *
C<"pipe"> - connect to the named pipe indicated by the C<path> option,
or, if omitted, to the value returned by the C<_PATH_LOG> macro (if your
system defines it), or F</dev/log> (added in C<Sys::Syslog> 0.21).
HP-UX is a system which uses such a named pipe.
=item *
C<"console"> - send messages directly to the console, as for the C<"cons">
option of C<openlog()>.
=back
The default is to try C<native>, C<tcp>, C<udp>, C<unix>, C<pipe>, C<stream>,
C<console>.
Under systems with the Win32 API, C<eventlog> will be added as the first
mechanism to try if C<Win32::EventLog> is available.
Giving an invalid value for C<$sock_type> will C<croak>.
B<Examples>
Select the UDP socket mechanism:
setlogsock("udp");
Send messages using the TCP socket mechanism on a custom port:
setlogsock({ type => "tcp", port => 2486 });
Send messages to a remote host using the TCP socket mechanism:
setlogsock({ type => "tcp", host => $loghost });
Try the native, UDP socket then UNIX domain socket mechanisms:
setlogsock(["native", "udp", "unix"]);
=over
=item B<Note>
Now that the "native" mechanism is supported by C<Sys::Syslog> and selected
by default, the use of the C<setlogsock()> function is discouraged because
other mechanisms are less portable across operating systems. Authors of
modules and programs that use this function, especially its cargo-cult form
C<setlogsock("unix")>, are advised to remove any occurrence of it unless they
specifically want to use a given mechanism (like TCP or UDP to connect to
a remote host).
=back
=item B<closelog()>
Closes the log file and returns true on success.
=back
=head1 THE RULES OF SYS::SYSLOG
I<The First Rule of Sys::Syslog is:>
You do not call C<setlogsock>.
I<The Second Rule of Sys::Syslog is:>
You B<do not> call C<setlogsock>.
I<The Third Rule of Sys::Syslog is:>
The program crashes, C<die>s, calls C<closelog>, the log is over.
I<The Fourth Rule of Sys::Syslog is:>
One facility, one priority.
I<The Fifth Rule of Sys::Syslog is:>
One log at a time.
I<The Sixth Rule of Sys::Syslog is:>
No C<syslog> before C<openlog>.
I<The Seventh Rule of Sys::Syslog is:>
Logs will go on as long as they have to.
I<The Eighth, and Final Rule of Sys::Syslog is:>
If this is your first use of Sys::Syslog, you must read the doc.
=head1 EXAMPLES
An example:
openlog($program, 'cons,pid', 'user');
syslog('info', '%s', 'this is another test');
syslog('mail|warning', 'this is a better test: %d', time);
closelog();
syslog('debug', 'this is the last test');
Another example:
openlog("$program $$", 'ndelay', 'user');
syslog('notice', 'fooprogram: this is really done');
Example of use of C<%m>:
$! = 55;
syslog('info', 'problem was %m'); # %m == $! in syslog(3)
Log to UDP port on C<$remotehost> instead of logging locally:
setlogsock("udp", $remotehost);
openlog($program, 'ndelay', 'user');
syslog('info', 'something happened over here');
=head1 CONSTANTS
=head2 Facilities
=over 4
=item *
C<LOG_AUDIT> - audit daemon (IRIX); falls back to C<LOG_AUTH>
=item *
C<LOG_AUTH> - security/authorization messages
=item *
C<LOG_AUTHPRIV> - security/authorization messages (private)
=item *
C<LOG_CONSOLE> - C</dev/console> output (FreeBSD); falls back to C<LOG_USER>
=item *
C<LOG_CRON> - clock daemons (B<cron> and B<at>)
=item *
C<LOG_DAEMON> - system daemons without separate facility value
=item *
C<LOG_FTP> - FTP daemon
=item *
C<LOG_KERN> - kernel messages
=item *
C<LOG_INSTALL> - installer subsystem (Mac OS X); falls back to C<LOG_USER>
=item *
C<LOG_LAUNCHD> - launchd - general bootstrap daemon (Mac OS X);
falls back to C<LOG_DAEMON>
=item *
C<LOG_LFMT> - logalert facility; falls back to C<LOG_USER>
=item *
C<LOG_LOCAL0> through C<LOG_LOCAL7> - reserved for local use
=item *
C<LOG_LPR> - line printer subsystem
=item *
C<LOG_MAIL> - mail subsystem
=item *
C<LOG_NETINFO> - NetInfo subsystem (Mac OS X); falls back to C<LOG_DAEMON>
=item *
C<LOG_NEWS> - USENET news subsystem
=item *
C<LOG_NTP> - NTP subsystem (FreeBSD, NetBSD); falls back to C<LOG_DAEMON>
=item *
C<LOG_RAS> - Remote Access Service (VPN / PPP) (Mac OS X);
falls back to C<LOG_AUTH>
=item *
C<LOG_REMOTEAUTH> - remote authentication/authorization (Mac OS X);
falls back to C<LOG_AUTH>
=item *
C<LOG_SECURITY> - security subsystems (firewalling, etc.) (FreeBSD);
falls back to C<LOG_AUTH>
=item *
C<LOG_SYSLOG> - messages generated internally by B<syslogd>
=item *
C<LOG_USER> (default) - generic user-level messages
=item *
C<LOG_UUCP> - UUCP subsystem
=back
=head2 Levels
=over 4
=item *
C<LOG_EMERG> - system is unusable
=item *
C<LOG_ALERT> - action must be taken immediately
=item *
C<LOG_CRIT> - critical conditions
=item *
C<LOG_ERR> - error conditions
=item *
C<LOG_WARNING> - warning conditions
=item *
C<LOG_NOTICE> - normal, but significant, condition
=item *
C<LOG_INFO> - informational message
=item *
C<LOG_DEBUG> - debug-level message
=back
=head1 DIAGNOSTICS
=over
=item C<Invalid argument passed to setlogsock>
B<(F)> You gave C<setlogsock()> an invalid value for C<$sock_type>.
=item C<eventlog passed to setlogsock, but no Win32 API available>
B<(W)> You asked C<setlogsock()> to use the Win32 event logger but the
operating system running the program isn't Win32 or does not provides Win32
compatible facilities.
=item C<no connection to syslog available>
B<(F)> C<syslog()> failed to connect to the specified socket.
=item C<stream passed to setlogsock, but %s is not writable>
B<(W)> You asked C<setlogsock()> to use a stream socket, but the given
path is not writable.
=item C<stream passed to setlogsock, but could not find any device>
B<(W)> You asked C<setlogsock()> to use a stream socket, but didn't
provide a path, and C<Sys::Syslog> was unable to find an appropriate one.
=item C<tcp passed to setlogsock, but tcp service unavailable>
B<(W)> You asked C<setlogsock()> to use a TCP socket, but the service
is not available on the system.
=item C<syslog: expecting argument %s>
B<(F)> You forgot to give C<syslog()> the indicated argument.
=item C<syslog: invalid level/facility: %s>
B<(F)> You specified an invalid level or facility.
=item C<syslog: too many levels given: %s>
B<(F)> You specified too many levels.
=item C<syslog: too many facilities given: %s>
B<(F)> You specified too many facilities.
=item C<syslog: level must be given>
B<(F)> You forgot to specify a level.
=item C<udp passed to setlogsock, but udp service unavailable>
B<(W)> You asked C<setlogsock()> to use a UDP socket, but the service
is not available on the system.
=item C<unix passed to setlogsock, but path not available>
B<(W)> You asked C<setlogsock()> to use a UNIX socket, but C<Sys::Syslog>
was unable to find an appropriate an appropriate device.
=back
=head1 HISTORY
C<Sys::Syslog> is a core module, part of the standard Perl distribution
since 1990. At this time, modules as we know them didn't exist, the
Perl library was a collection of F<.pl> files, and the one for sending
syslog messages with was simply F<lib/syslog.pl>, included with Perl 3.0.
It was converted as a module with Perl 5.0, but had a version number
only starting with Perl 5.6. Here is a small table with the matching
Perl and C<Sys::Syslog> versions.
Sys::Syslog Perl
----------- ----
undef 5.0.0 ~ 5.5.4
0.01 5.6.*
0.03 5.8.0
0.04 5.8.1, 5.8.2, 5.8.3
0.05 5.8.4, 5.8.5, 5.8.6
0.06 5.8.7
0.13 5.8.8
0.22 5.10.0
0.27 5.8.9, 5.10.1 ~ 5.14.2
0.29 5.16.0, 5.16.1
=head1 SEE ALSO
=head2 Other modules
L<Log::Log4perl> - Perl implementation of the Log4j API
L<Log::Dispatch> - Dispatches messages to one or more outputs
L<Log::Report> - Report a problem, with exceptions and language support
=head2 Manual Pages
L<syslog(3)>
SUSv3 issue 6, IEEE Std 1003.1, 2004 edition,
L<http://www.opengroup.org/onlinepubs/000095399/basedefs/syslog.h.html>
GNU C Library documentation on syslog,
L<http://www.gnu.org/software/libc/manual/html_node/Syslog.html>
Solaris 10 documentation on syslog,
L<http://docs.sun.com/app/docs/doc/816-5168/syslog-3c?a=view>
Mac OS X documentation on syslog,
L<http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/syslog.3.html>
IRIX 6.5 documentation on syslog,
L<http://techpubs.sgi.com/library/tpl/cgi-bin/getdoc.cgi?coll=0650&db=man&fname=3c+syslog>
AIX 5L 5.3 documentation on syslog,
L<http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf2/syslog.htm>
HP-UX 11i documentation on syslog,
L<http://docs.hp.com/en/B2355-60130/syslog.3C.html>
Tru64 5.1 documentation on syslog,
L<http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/V51_HTML/MAN/MAN3/0193____.HTM>
Stratus VOS 15.1,
L<http://stratadoc.stratus.com/vos/15.1.1/r502-01/wwhelp/wwhimpl/js/html/wwhelp.htm?context=r502-01&file=ch5r502-01bi.html>
=head2 RFCs
I<RFC 3164 - The BSD syslog Protocol>, L<http://www.faqs.org/rfcs/rfc3164.html>
-- Please note that this is an informational RFC, and therefore does not
specify a standard of any kind.
I<RFC 3195 - Reliable Delivery for syslog>, L<http://www.faqs.org/rfcs/rfc3195.html>
=head2 Articles
I<Syslogging with Perl>, L<http://lexington.pm.org/meetings/022001.html>
=head2 Event Log
Windows Event Log,
L<http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wes/wes/windows_event_log.asp>
=head1 AUTHORS & ACKNOWLEDGEMENTS
Tom Christiansen E<lt>F<tchrist (at) perl.com>E<gt> and Larry Wall
E<lt>F<larry (at) wall.org>E<gt>.
UNIX domain sockets added by Sean Robinson
E<lt>F<robinson_s (at) sc.maricopa.edu>E<gt> with support from Tim Bunce
E<lt>F<Tim.Bunce (at) ig.co.uk>E<gt> and the C<perl5-porters> mailing list.
Dependency on F<syslog.ph> replaced with XS code by Tom Hughes
E<lt>F<tom (at) compton.nu>E<gt>.
Code for C<constant()>s regenerated by Nicholas Clark E<lt>F<nick (at) ccl4.org>E<gt>.
Failover to different communication modes by Nick Williams
E<lt>F<Nick.Williams (at) morganstanley.com>E<gt>.
Extracted from core distribution for publishing on the CPAN by
SE<eacute>bastien Aperghis-Tramoni E<lt>sebastien (at) aperghis.netE<gt>.
XS code for using native C functions borrowed from C<L<Unix::Syslog>>,
written by Marcus Harnisch E<lt>F<marcus.harnisch (at) gmx.net>E<gt>.
Yves Orton suggested and helped for making C<Sys::Syslog> use the native
event logger under Win32 systems.
Jerry D. Hedden and Reini Urban provided greatly appreciated help to
debug and polish C<Sys::Syslog> under Cygwin.
=head1 BUGS
Please report any bugs or feature requests to
C<bug-sys-syslog (at) rt.cpan.org>, or through the web interface at
L<http://rt.cpan.org/Public/Dist/Display.html?Name=Sys-Syslog>.
I will be notified, and then you'll automatically be notified of progress on
your bug as I make changes.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Sys::Syslog
You can also look for information at:
=over 4
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Sys-Syslog>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Sys-Syslog>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/Dist/Display.html?Queue=Sys-Syslog>
=item * Search CPAN
L<http://search.cpan.org/dist/Sys-Syslog/>
=item * MetaCPAN
L<https://metacpan.org/module/Sys::Syslog>
=item * Perl Documentation
L<http://perldoc.perl.org/Sys/Syslog.html>
=back
=head1 COPYRIGHT
Copyright (C) 1990-2012 by Larry Wall and others.
=head1 LICENSE
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
=begin comment
Notes for the future maintainer (even if it's still me..)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Using Google Code Search, I search who on Earth was relying on $host being
public. It found 5 hits:
* First was inside Indigo Star Perl2exe documentation. Just an old version
of Sys::Syslog.
* One real hit was inside DalWeathDB, a weather related program. It simply
does a
$Sys::Syslog::host = '127.0.0.1';
- L<http://www.gallistel.net/nparker/weather/code/>
* Two hits were in TPC, a fax server thingy. It does a
$Sys::Syslog::host = $TPC::LOGHOST;
but also has this strange piece of code:
# work around perl5.003 bug
sub Sys::Syslog::hostname {}
I don't know what bug the author referred to.
- L<http://www.tpc.int/>
- L<ftp://ftp-usa.tpc.int/pub/tpc/server/UNIX/>
* Last hit was in Filefix, which seems to be a FIDOnet mail program (!).
This one does not use $host, but has the following piece of code:
sub Sys::Syslog::hostname
{
use Sys::Hostname;
return hostname;
}
I guess this was a more elaborate form of the previous bit, maybe because
of a bug in Sys::Syslog back then?
- L<ftp://ftp.kiae.su/pub/unix/fido/>
Links
-----
Linux Fast-STREAMS
- L<http://www.openss7.org/streams.html>
II12021: SYSLOGD HOWTO TCPIPINFO (z/OS, OS/390, MVS)
- L<http://www-1.ibm.com/support/docview.wss?uid=isg1II12021>
Getting the most out of the Event Viewer
- L<http://www.codeproject.com/dotnet/evtvwr.asp?print=true>
Log events to the Windows NT Event Log with JNI
- L<http://www.javaworld.com/javaworld/jw-09-2001/jw-0928-ntmessages.html>
=end comment
|