/usr/share/perl5/Perlbal/TCPListener.pm is in libperlbal-perl 1.80-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# TCP listener on a given port
#
# Copyright 2004, Danga Interactive, Inc.
# Copyright 2005-2007, Six Apart, Ltd.
package Perlbal::TCPListener;
use strict;
use warnings;
no warnings qw(deprecated);
use base "Perlbal::Socket";
use fields ('service',
'hostport',
'sslopts',
'v6', # bool: IPv6 libraries are available
);
use Socket qw(IPPROTO_TCP SOL_SOCKET SO_SNDBUF);
BEGIN {
eval { require Perlbal::SocketSSL };
if (Perlbal::DEBUG > 0 && $@) { warn "SSL support failed on load: $@\n" }
}
# TCPListener
sub new {
my Perlbal::TCPListener $self = shift;
my ($hostport, $service, $opts) = @_;
$self = fields::new($self) unless ref $self;
$opts ||= {};
# Were ipv4 or ipv6 explicitly mentioned by syntax?
my $force_v4 = 0;
my $force_v6 = 0;
my @args;
if ($hostport =~ /^\d+$/) {
@args = ('LocalPort' => $hostport);
} elsif ($hostport =~ /^\d+\.\d+\.\d+\.\d+:/) {
$force_v4 = 1;
@args = ('LocalAddr' => $hostport);
}
my $v6_errors = "";
my $can_v6 = 0;
if (!$force_v4) {
eval "use Danga::Socket 1.61; 1; ";
if ($@) {
$v6_errors = "Danga::Socket 1.61 required for IPv6 support.";
} elsif (!eval { require IO::Socket::INET6; 1 }) {
$v6_errors = "IO::Socket::INET6 required for IPv6 support.";
} else {
$can_v6 = 1;
}
}
my $socket_class = $can_v6 ? "IO::Socket::INET6" : "IO::Socket::INET";
$self->{v6} = $can_v6;
my $sock = $socket_class->new(
@args,
Proto => IPPROTO_TCP,
Listen => 1024,
ReuseAddr => 1,
);
return Perlbal::error("Error creating listening socket: " . ($@ || $!))
unless $sock;
if ($^O eq 'MSWin32') {
# On Windows, we have to do this a bit differently.
# IO::Socket should really do this for us, but whatever.
my $do = 1;
ioctl($sock, 0x8004667E, \$do) or return Perlbal::error("Unable to make listener on $hostport non-blocking: $!");
}
else {
# IO::Socket::INET's Blocking => 0 just doesn't seem to work
# on lots of perls. who knows why.
IO::Handle::blocking($sock, 0) or return Perlbal::error("Unable to make listener on $hostport non-blocking: $!");
}
$self->SUPER::new($sock);
$self->{service} = $service;
$self->{hostport} = $hostport;
$self->{sslopts} = $opts->{ssl};
$self->watch_read(1);
return $self;
}
# TCPListener: accepts a new client connection
sub event_read {
my Perlbal::TCPListener $self = shift;
# accept as many connections as we can
while (my ($psock, $peeraddr) = $self->{sock}->accept) {
IO::Handle::blocking($psock, 0);
if (my $sndbuf = $self->{service}->{client_sndbuf_size}) {
my $rv = setsockopt($psock, SOL_SOCKET, SO_SNDBUF, pack("L", $sndbuf));
}
if (Perlbal::DEBUG >= 1) {
my ($pport, $pipr) = $self->{v6} ?
Socket6::unpack_sockaddr_in6($peeraddr) :
Socket::sockaddr_in($peeraddr);
my $pip = $self->{v6} ?
"[" . Socket6::inet_ntop(Socket6::AF_INET6(), $pipr) . "]" :
Socket::inet_ntoa($pipr);
print "Got new conn: $psock ($pip:$pport) for " . $self->{service}->role . "\n";
}
# SSL promotion if necessary
if ($self->{sslopts}) {
# try to upgrade to SSL, this does no IO it just re-blesses
# and prepares the SSL engine for handling us later
Perlbal::SocketSSL2->start_SSL(
$psock,
SSL_server => 1,
SSL_startHandshake => 0,
%{ $self->{sslopts} },
);
print " .. socket upgraded to SSL!\n" if Perlbal::DEBUG >= 1;
# safety checking to ensure we got upgraded
return $psock->close
unless ref $psock eq 'Perlbal::SocketSSL2';
# class into new package and run with it
my $sslsock = new Perlbal::SocketSSL($psock, $self);
$sslsock->try_accept;
# all done from our point of view
next;
}
# puts this socket into the right class
$self->class_new_socket($psock);
}
}
sub class_new_socket {
my Perlbal::TCPListener $self = shift;
my $psock = shift;
my $service_role = $self->{service}->role;
if ($service_role eq "reverse_proxy") {
return Perlbal::ClientProxy->new($self->{service}, $psock);
} elsif ($service_role eq "management") {
return Perlbal::ClientManage->new($self->{service}, $psock);
} elsif ($service_role eq "web_server") {
return Perlbal::ClientHTTP->new($self->{service}, $psock);
} elsif ($service_role eq "selector") {
# will be cast to a more specific class later...
return Perlbal::ClientHTTPBase->new($self->{service}, $psock, $self->{service});
} elsif (my $creator = Perlbal::Service::get_role_creator($service_role)) {
# was defined by a plugin, so we want to return one of these
return $creator->($self->{service}, $psock);
}
}
sub as_string {
my Perlbal::TCPListener $self = shift;
my $ret = $self->SUPER::as_string;
my Perlbal::Service $svc = $self->{service};
$ret .= ": listening on $self->{hostport} for service '$svc->{name}'";
return $ret;
}
sub as_string_html {
my Perlbal::TCPListener $self = shift;
my $ret = $self->SUPER::as_string_html;
my Perlbal::Service $svc = $self->{service};
$ret .= ": listening on $self->{hostport} for service <b>$svc->{name}</b>";
return $ret;
}
sub die_gracefully {
# die off so we stop waiting for new connections
my $self = shift;
$self->close('graceful_death');
}
1;
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