1 | #
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2 | # syslog.pl
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3 | #
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4 | # $Log: syslog.pl,v $
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5 | #
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6 | # tom christiansen <[email protected]>
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7 | # modified to use sockets by Larry Wall <[email protected]>
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8 | # NOTE: openlog now takes three arguments, just like openlog(3)
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9 | #
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10 | # call syslog() with a string priority and a list of printf() args
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11 | # like syslog(3)
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12 | #
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13 | # usage: require 'syslog.pl';
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14 | #
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15 | # then (put these all in a script to test function)
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16 | #
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17 | #
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18 | # do openlog($program,'cons,pid','user');
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19 | # do syslog('info','this is another test');
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20 | # do syslog('mail|warning','this is a better test: %d', time);
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21 | # do closelog();
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22 | #
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23 | # do syslog('debug','this is the last test');
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24 | # do openlog("$program $$",'ndelay','user');
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25 | # do syslog('notice','fooprogram: this is really done');
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26 | #
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27 | # $! = 55;
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28 | # do syslog('info','problem was %m'); # %m == $! in syslog(3)
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29 |
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30 | package syslog;
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31 |
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32 | use warnings::register;
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33 |
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34 | $host = 'localhost' unless $host; # set $syslog'host to change
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35 |
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36 | if ($] >= 5 && warnings::enabled()) {
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37 | warnings::warn("You should 'use Sys::Syslog' instead; continuing");
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38 | }
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39 |
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40 | require 'syslog.ph';
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41 |
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42 | eval 'use Socket; 1' ||
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43 | eval { require "socket.ph" } ||
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44 | require "sys/socket.ph";
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45 |
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46 | $maskpri = &LOG_UPTO(&LOG_DEBUG);
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47 |
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48 | sub main'openlog {
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49 | ($ident, $logopt, $facility) = @_; # package vars
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50 | $lo_pid = $logopt =~ /\bpid\b/;
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51 | $lo_ndelay = $logopt =~ /\bndelay\b/;
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52 | $lo_cons = $logopt =~ /\bcons\b/;
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53 | $lo_nowait = $logopt =~ /\bnowait\b/;
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54 | &connect if $lo_ndelay;
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55 | }
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56 |
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57 | sub main'closelog {
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58 | $facility = $ident = '';
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59 | &disconnect;
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60 | }
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61 |
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62 | sub main'setlogmask {
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63 | local($oldmask) = $maskpri;
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64 | $maskpri = shift;
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65 | $oldmask;
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66 | }
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67 |
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68 | sub main'syslog {
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69 | local($priority) = shift;
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70 | local($mask) = shift;
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71 | local($message, $whoami);
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72 | local(@words, $num, $numpri, $numfac, $sum);
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73 | local($facility) = $facility; # may need to change temporarily.
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74 |
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75 | die "syslog: expected both priority and mask" unless $mask && $priority;
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76 |
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77 | @words = split(/\W+/, $priority, 2);# Allow "level" or "level|facility".
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78 | undef $numpri;
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79 | undef $numfac;
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80 | foreach (@words) {
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81 | $num = &xlate($_); # Translate word to number.
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82 | if (/^kern$/ || $num < 0) {
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83 | die "syslog: invalid level/facility: $_\n";
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84 | }
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85 | elsif ($num <= &LOG_PRIMASK) {
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86 | die "syslog: too many levels given: $_\n" if defined($numpri);
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87 | $numpri = $num;
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88 | return 0 unless &LOG_MASK($numpri) & $maskpri;
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89 | }
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90 | else {
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91 | die "syslog: too many facilities given: $_\n" if defined($numfac);
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92 | $facility = $_;
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93 | $numfac = $num;
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94 | }
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95 | }
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96 |
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97 | die "syslog: level must be given\n" unless defined($numpri);
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98 |
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99 | if (!defined($numfac)) { # Facility not specified in this call.
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100 | $facility = 'user' unless $facility;
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101 | $numfac = &xlate($facility);
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102 | }
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103 |
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104 | &connect unless $connected;
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105 |
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106 | $whoami = $ident;
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107 |
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108 | if (!$ident && $mask =~ /^(\S.*):\s?(.*)/) {
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109 | $whoami = $1;
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110 | $mask = $2;
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111 | }
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112 |
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113 | unless ($whoami) {
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114 | ($whoami = getlogin) ||
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115 | ($whoami = getpwuid($<)) ||
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116 | ($whoami = 'syslog');
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117 | }
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118 |
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119 | $whoami .= "[$$]" if $lo_pid;
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120 |
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121 | $mask =~ s/%m/$!/g;
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122 | $mask .= "\n" unless $mask =~ /\n$/;
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123 | $message = sprintf ($mask, @_);
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124 |
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125 | $sum = $numpri + $numfac;
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126 | unless (send(SYSLOG,"<$sum>$whoami: $message",0)) {
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127 | if ($lo_cons) {
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128 | if ($pid = fork) {
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129 | unless ($lo_nowait) {
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130 | do {$died = wait;} until $died == $pid || $died < 0;
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131 | }
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132 | }
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133 | else {
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134 | open(CONS,">/dev/console");
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135 | print CONS "<$facility.$priority>$whoami: $message\r";
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136 | exit if defined $pid; # if fork failed, we're parent
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137 | close CONS;
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138 | }
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139 | }
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140 | }
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141 | }
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142 |
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143 | sub xlate {
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144 | local($name) = @_;
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145 | $name = uc $name;
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146 | $name = "LOG_$name" unless $name =~ /^LOG_/;
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147 | $name = "syslog'$name";
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148 | defined &$name ? &$name : -1;
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149 | }
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150 |
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151 | sub connect {
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152 | $pat = 'S n C4 x8';
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153 |
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154 | $af_unix = &AF_UNIX;
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155 | $af_inet = &AF_INET;
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156 |
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157 | $stream = &SOCK_STREAM;
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158 | $datagram = &SOCK_DGRAM;
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159 |
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160 | ($name,$aliases,$proto) = getprotobyname('udp');
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161 | $udp = $proto;
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162 |
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163 | ($name,$aliases,$port,$proto) = getservbyname('syslog','udp');
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164 | $syslog = $port;
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165 |
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166 | if (chop($myname = `hostname`)) {
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167 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($myname);
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168 | die "Can't lookup $myname\n" unless $name;
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169 | @bytes = unpack("C4",$addrs[0]);
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170 | }
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171 | else {
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172 | @bytes = (0,0,0,0);
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173 | }
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174 | $this = pack($pat, $af_inet, 0, @bytes);
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175 |
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176 | if ($host =~ /^\d+\./) {
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177 | @bytes = split(/\./,$host);
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178 | }
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179 | else {
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180 | ($name,$aliases,$addrtype,$length,@addrs) = gethostbyname($host);
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181 | die "Can't lookup $host\n" unless $name;
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182 | @bytes = unpack("C4",$addrs[0]);
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183 | }
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184 | $that = pack($pat,$af_inet,$syslog,@bytes);
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185 |
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186 | socket(SYSLOG,$af_inet,$datagram,$udp) || die "socket: $!\n";
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187 | bind(SYSLOG,$this) || die "bind: $!\n";
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188 | connect(SYSLOG,$that) || die "connect: $!\n";
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189 |
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190 | local($old) = select(SYSLOG); $| = 1; select($old);
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191 | $connected = 1;
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192 | }
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193 |
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194 | sub disconnect {
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195 | close SYSLOG;
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196 | $connected = 0;
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197 | }
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198 |
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199 | 1;
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