| #!/opt/perl5/bin/perl -w |
| # |
| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You under the Apache License, Version 2.0 |
| # (the "License"); you may not use this file except in compliance with |
| # the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| use strict; |
| use Socket; |
| use IO::Socket; |
| use Sys::Hostname; |
| |
| main(); |
| exit(0); |
| |
| sub main() |
| { |
| my $MAX_MSG_SIZE = 16384; # 16KBytes should be enough... |
| |
| my $svrport = 8300; |
| my $svriaddr = gethostbyname(hostname()); |
| my $svrproto = getprotobyname('udp'); |
| my $svrpaddr = sockaddr_in($svrport, $svriaddr); |
| |
| socket(SOCKET, PF_INET, SOCK_DGRAM, $svrproto) || die "socket: $!"; |
| bind(SOCKET, $svrpaddr) || die "bind: $!"; |
| |
| my $rin = ''; |
| vec($rin, fileno(SOCKET), 1) = 1; |
| |
| # timeout after 10.0 seconds |
| # at some time, I'm going to add signal handlers so that signals can be |
| # sent to cause logfile rollover, or tidy exit...then the timeout will |
| # come in useful.. |
| |
| my $exit = 0; |
| while (!$exit) |
| { |
| my $rout = $rin; |
| |
| # select(readvec, writevec, exceptionvec, timeout) |
| # : returns # of selected filehandles, modifies |
| # vector parameters so that set bits indicate |
| # filehandles which are readable, writable or have |
| # an exception state |
| |
| my $nSelected = select($rout, undef, undef, 10.0); |
| if ($nSelected == 0) |
| { |
| # timedout : go back to start of loop |
| next; |
| } |
| |
| my $msgData = ''; |
| my $clientpaddr = recv(SOCKET, $msgData, $MAX_MSG_SIZE, 0); |
| if (!$clientpaddr) |
| { |
| die "recv: $!"; |
| } |
| |
| my ($clientport, $clientiaddr) = sockaddr_in($clientpaddr); |
| my $clienthost = gethostbyaddr($clientiaddr, AF_INET); |
| if (!$clienthost) |
| { |
| # unable to determine name for client : show raw ip address |
| $clienthost = inet_ntoa($clientiaddr); |
| } |
| |
| print "$clienthost:$msgData\n"; |
| } |
| } |
| |
| |