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| -rwxr-xr-x | tests/scripts/webserver.pl | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/tests/scripts/webserver.pl b/tests/scripts/webserver.pl new file mode 100755 index 0000000..a1d171d --- /dev/null +++ b/tests/scripts/webserver.pl @@ -0,0 +1,276 @@ +#!/usr/bin/perl -w + +# Simple WEB server. +# +# Inspired by some examples from the perlipc and other perl manual pages. +# +# Copyright (C) 2009 Michael Adam +# +# License: GPL + +use strict; + +use IO::Socket; +use IO::Select; +use Carp; +use POSIX qw(setsid :sys_wait_h); +use Errno; +use Getopt::Long; +use Pod::Usage; +use Fcntl ':flock'; # import LOCK_* constants + +my $EOL = "\015\012"; + +my $port = 2345; +my $proto = getprotobyname('tcp'); +my $pid_file = "./webserver.pid"; +my $log_dir = "./"; +my $access_log_file; +my $error_log_file; +my $document_root = "./"; +my $help = 0; + +sub create_child($$$); + +sub logmsg { + print STDERR "[", scalar localtime, ", $$] $0: @_\n"; +} + +sub start_server($$) { + my $proto = shift; + my $port = shift; + my $server; + + $server = IO::Socket::INET->new(Proto => $proto, + LocalPort => $port, + Listen => SOMAXCONN, + Reuse => 1); + + logmsg "server started listening on port $port"; + + return $server; +} + +sub REAPER { + local $!; # don't let waitpid() overwrite current error + + while ((my $pid = waitpid(-1,WNOHANG)) > 0 && WIFEXITED($?)) { + logmsg "reaped $pid" . ($? ? " with exit code $?" : ''); + } + + $SIG{CHLD} = \&REAPER; +} + +sub child_action($) { + my $client = shift; + my $client_ip = shift; + + logmsg "client_action: client $client_ip"; + + $client->autoflush(); + + my $fortune_bin = "/usr/games/fortune"; + my $fortune = ""; + if ( -x $fortune_bin) { + $fortune = qx(/usr/games/fortune); + $fortune =~ s/\n/$EOL/g; + } + + my $request = ""; + while (my $request_line = <$client>) { + $request .= $request_line; + last if ($request_line eq $EOL); + } + + logmsg "request:\n" . + "------------------------------\n" . + "$request" . + "------------------------------"; + + print $client "HTTP/1.0 200 OK$EOL"; + print $client "Server: Tinyproxy Test Web Server$EOL"; + print $client "Content-Type: text/html$EOL"; + print $client "$EOL"; + print $client "<html>$EOL"; + print $client "<h1>Tinyproxy test WEB server</h1>$EOL"; + print $client "<h2>Fortune</h2>$EOL"; + if ($fortune) { + print $client "<pre>$fortune</pre>$EOL"; + } else { + print $client "Sorry, no $fortune_bin not found.$EOL"; + } + print $client "<h2>Your request:</h2>$EOL"; + print $client "<pre>$request<pre>$EOL"; + print $client "</html>$EOL"; + + close $client; + + return 0; +} + +sub create_child($$$) { + my $client = shift; + my $action = shift; + my $client_ip = shift; + + unless (@_ == 0 && $action && ref($action) eq 'CODE') { + confess "internal error. create_child needs code reference as argument"; + } + + my $pid = fork(); + if (not defined($pid)) { + # error + logmsg "cannot fork: $!"; + return; + } elsif ($pid) { + # parent + logmsg "child process created with pid $pid"; + return; + } else { + # child + exit &$action($client, $client_ip); + } +} + +sub process_options() { + my $result = GetOptions("help|?" => \$help, + "port=s" => \$port, + "pid-file=s" => \$pid_file, + "log-dir=s" => \$log_dir, + "root|document-root=s" => \$document_root); + die "Error reading cmdline options! $!" unless $result; + + pod2usage(1) if $help; + + # some post-processing: + + ($port) = $port =~ /^(\d+)$/ or die "invalid port"; + $access_log_file = "$log_dir/webserver.access_log"; + $error_log_file = "$log_dir/webserver.error_log"; +} + +sub daemonize() { + umask 0; + chdir "/" or die "daemonize: can't chdir to /: $!"; + open STDIN, "/dev/null" or + die "daemonize: Can't read from /dev/null: $!"; + open STDOUT, ">> $access_log_file" or + die "daemonize: Can't write to '$access_log_file': $!"; + open STDERR, ">> $error_log_file" or + die "daemonize: Can't write to '$error_log_file': $!"; + + my $pid = fork(); + die "daemonize: can't fork: $!" if not defined($pid); + exit(0) if $pid != 0; # parent + + # child (daemon) + setsid or die "damonize: Can't create a new session: $!"; +} + +sub get_pid_lock() { + open LOCKFILE, "> $pid_file" or + die "Error opening pid-file $pid_file: $!"; + unless (flock(LOCKFILE, LOCK_EX|LOCK_NB)) { + my $other_pid = qx(cat $pid_file); + print "Webserver is already running (pid $other_pid)"; + exit(0); + } + + print LOCKFILE "$$"; +} + +sub release_pid_lock() { + flock(LOCKFILE, LOCK_UN); + close LOCKFILE; +} + +# "main" ... + +$|=1; # autoflush + +process_options(); + +daemonize(); + +get_pid_lock(); + +$SIG{CHLD} = \&REAPER; + +my $server = start_server($proto, $port); +my $slct = IO::Select->new($server); + +while (1) { + my @ready_for_reading = $slct->can_read(); + foreach my $fh (@ready_for_reading) { + if ($fh != $server) { + logmsg "select: fh ready for reading but not server", + "don't know what to do..."; + } + + # new connection: + my $client = $server->accept() or do { + # try again if accept() returned because + # a signal was received + if ($!{EINTR}) { + logmsg "accept: got signal EINTR ..."; + next; + } + die "accept: $!"; + }; + my $client_ip = inet_ntoa($client->peeraddr); + logmsg "connection from $client_ip at port " . $client->peerport; + create_child($client, \&child_action, $client_ip); + close $client; + } +} + +# never reached... +logmsg "Server done - ooops!\n"; + +release_pid_lock(); + +exit(0); + +__END__ + +=head1 webserver.pl + +A simple WEB server written in perl. + +=head1 SYNOPSIS + +webserver.pl [options] + +=head1 OPTIONS + +=over 8 + +=item B<--help> + +Print a brief help message and exit. + +=item B<--port> + +Specify the port number for the server to listen on. + +=item B<--root|--document-root> + +Specify the document root directory from which to serve web content. + +=item B<--log-dir> + +Specify the directory where the log files should be stored. + +=item B<--pid-file> + +Specify the location of the pid lock file. + +=back + +=head1 DESCRIPTION + +This is a very simple web server. It currently does not deliver the specific web +page requested, but constructs the same kind of answer for each request, citing +a fortune if fortune is available, and printing the originating request. + +=cut |