0x000BLAh

#!/usr/bin/perl
use FCGI;
use Socket;
use FCGI::ProcManager;
sub shutdown { FCGI::CloseSocket($socket); exit; }
sub restart  { FCGI::CloseSocket($socket); &main; }
use sigtrap 'handler', \&shutdown, 'normal-signals';
use sigtrap 'handler', \&restart,  'HUP';
require 'syscall.ph';
use POSIX qw(setsid);

END()   { }
BEGIN() { }
{
 no warnings;
*CORE::GLOBAL::exit = sub { die "fakeexit\nrc=" . shift() . "\n"; };
};
eval q{exit};
if ($@) {
 exit unless $@ =~ /^fakeexit/;
}
&main;

sub daemonize() {
 chdir '/' or die "Can't chdir to /: $!";
 defined( my $pid = fork ) or die "Can't fork: $!";
 exit if $pid;
 setsid() or die "Can't start a new session: $!";
 umask 0;
}

sub main {

 $proc_manager = FCGI::ProcManager->new( {n_processes => 5} );
@@ $socket = FCGI::OpenSocket( "/nginx/fcgi/cgi.sock", 10 )
 ; #use UNIX sockets - user running this script must have w access to the 'nginx' folder!!
 $request =
 FCGI::Request( \*STDIN, \*STDOUT, \*STDERR, \%req_params, $socket,
 &FCGI::FAIL_ACCEPT_ON_INTR );
 $proc_manager->pm_manage();
 if ($request) { request_loop() }
 FCGI::CloseSocket($socket);
}

sub request_loop {
 while ( $request->Accept() >= 0 ) {
 $proc_manager->pm_pre_dispatch();

 #processing any STDIN input from WebServer (for CGI-POST actions)
 $stdin_passthrough = '';
 { no warnings; $req_len = 0 + $req_params{'CONTENT_LENGTH'}; };
 if ( ( $req_params{'REQUEST_METHOD'} eq 'POST' ) && ( $req_len != 0 ) )
 {
 my $bytes_read = 0;
 while ( $bytes_read < $req_len ) {
 my $data = '';
 my $bytes = read( STDIN, $data, ( $req_len - $bytes_read ) );
 last if ( $bytes == 0 || !defined($bytes) );
 $stdin_passthrough .= $data;
 $bytes_read += $bytes;
 }
 }

 #running the cgi app
 if (
 ( -x $req_params{SCRIPT_FILENAME} ) &&    #can I execute this?
 ( -s $req_params{SCRIPT_FILENAME} ) &&    #Is this file empty?
 ( -r $req_params{SCRIPT_FILENAME} )       #can I read this file?
 )
 {
 pipe( CHILD_RD,   PARENT_WR );
 pipe( PARENT_ERR, CHILD_ERR );
 my $pid = open( CHILD_O, "-|" );
 unless ( defined($pid) ) {
 print("Content-type: text/plain\r\n\r\n");
 print
"Error: CGI app returned no output - Executing $req_params{SCRIPT_FILENAME} failed !\n";
 next;
 }
 $oldfh = select(PARENT_ERR);
 $|     = 1;
 select(CHILD_O);
 $| = 1;
 select($oldfh);
 if ( $pid > 0 ) {
 close(CHILD_RD);
 close(CHILD_ERR);
 print PARENT_WR $stdin_passthrough;
 close(PARENT_WR);
 $rin = $rout = $ein = $eout = '';
 vec( $rin, fileno(CHILD_O),    1 ) = 1;
 vec( $rin, fileno(PARENT_ERR), 1 ) = 1;
 $ein    = $rin;
 $nfound = 0;

 while ( $nfound =
 select( $rout = $rin, undef, $ein = $eout, 10 ) )
 {
 die "$!" unless $nfound != -1;
 $r1 = vec( $rout, fileno(PARENT_ERR), 1 ) == 1;
 $r2 = vec( $rout, fileno(CHILD_O),    1 ) == 1;
 $e1 = vec( $eout, fileno(PARENT_ERR), 1 ) == 1;
 $e2 = vec( $eout, fileno(CHILD_O),    1 ) == 1;

 if ($r1) {
 while ( $bytes = read( PARENT_ERR, $errbytes, 4096 ) ) {
 print STDERR $errbytes;
 }
 if ($!) {
 $err = $!;
 die $!;
 vec( $rin, fileno(PARENT_ERR), 1 ) = 0
 unless ( $err == EINTR or $err == EAGAIN );
 }
 }
 if ($r2) {
 while ( $bytes = read( CHILD_O, $s, 4096 ) ) {
 print $s;
 }
 if ( !defined($bytes) ) {
 $err = $!;
 die $!;
 vec( $rin, fileno(CHILD_O), 1 ) = 0
 unless ( $err == EINTR or $err == EAGAIN );
 }
 }
 last if ( $e1 || $e2 );
 }
 close CHILD_RD;
 close PARENT_ERR;
 waitpid( $pid, 0 );
 } else {
 foreach $key ( keys %req_params ) {
 $ENV{$key} = $req_params{$key};
 }

 # cd to the script's local directory
 if ( $req_params{SCRIPT_FILENAME} =~ /^(.*)\/[^\/] +$/ ) {
 chdir $1;
 }
 close(PARENT_WR);

 #close(PARENT_ERR);
 close(STDIN);
 close(STDERR);

 #fcntl(CHILD_RD, F_DUPFD, 0);
 syscall( &SYS_dup2, fileno(CHILD_RD),  0 );
 syscall( &SYS_dup2, fileno(CHILD_ERR), 2 );

 #open(STDIN, "<&CHILD_RD");
 exec( $req_params{SCRIPT_FILENAME} );
 die("exec failed");
 }
 } else {
 print("Content-type: text/plain\r\n\r\n");
 print
"Error: No such CGI app - $req_params{SCRIPT_FILENAME} may not exist or is not executable by this process.\n";
 }
 }
}