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#!/usr/bin/perl |
package dhcpd; |
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=head1 dhcpd |
=head1 dhcpd |
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use IO::Socket::INET; |
use IO::Socket::INET; |
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use File::Slurp; |
use File::Slurp; |
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use Data::Dump qw/dump/; |
use Data::Dump qw/dump/; |
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use Net::Ping; |
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use Module::Refresh; |
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use lib '..'; |
use lib '..'; |
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use Net::DHCP::Packet; |
use Net::DHCP::Packet; |
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use Net::DHCP::Constants 0.67; |
use Net::DHCP::Constants 0.67; |
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use server; |
use server; |
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my $debug = server::debug; |
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my $debug = 1; |
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our ( $file, $gpxe_file ); |
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our ( $ip_from, $ip_to ) = ( 10, 100 ); |
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if ( ! $server::ip ) { |
if ( ! $server::ip ) { |
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my $server_ip = `/sbin/ifconfig`; |
my $server_ip = `/sbin/ifconfig`; |
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$server::ip = $server_ip; |
$server::ip = $server_ip; |
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} |
} |
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warn "server ip $server::ip\n"; |
warn "server ip $server::ip range: $server::ip_from - $server::ip_to\n"; |
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my $addr = $ip_from; |
use client; |
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sub client_ip { |
sub client_ip { |
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my ( $mac ) = @_; |
my ( $mac ) = @_; |
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my $conf = "conf/$server::ip"; |
my $conf = $server::conf; |
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mkdir $conf unless -e $conf; |
mkdir $conf unless -e $conf; |
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if ( -e "$conf/mac/$mac" ) { |
my $ip; |
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my $ip = read_file "$conf/mac/$mac"; |
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print "$mac old $ip\n"; |
if ( $ip = client::ip_from_mac( $mac ) ) { |
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print "RENEW $mac $ip\n"; |
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return $ip; |
return $ip; |
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} else { |
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$ip = client::next_ip; |
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print "NEW $mac $ip\n"; |
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symlink "$conf/ip/$ip", "$conf/mac/$mac"; |
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} |
} |
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mkdir $_ foreach grep { ! -e $_ } map { "$conf/$_" } ( 'ip', 'mac' ); |
my $ip_path = "$conf/ip/$ip"; |
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mkdir $ip_path unless -e $ip_path; |
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my $p = Net::Ping->new; |
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my $prefix = $server::ip; |
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$prefix =~ s{\.\d+$}{.}; |
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my $ip = $prefix . $addr; |
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while ( -e "conf/ip/$ip" || $p->ping( $ip ) ) { |
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$ip = $prefix . $addr++; |
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die "all addresses allocated!" if $addr == $ip_to; |
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} |
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write_file "$conf/mac/$mac", $ip; |
if ( -l "$ip_path/mac" && readlink "$ip_path/mac" ne "$conf/mac/$mac" ) { |
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if ( -l "$conf/ip/$ip" && readlink "$conf/ip/$ip" ne "$conf/mac/$mac") { |
warn "$mac IP changed from ", readlink "$ip_path/mac", " to $ip"; |
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unlink "$conf/ip/$ip"; |
unlink "$ip_path/mac"; |
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symlink "$conf/mac/$mac", "$conf/ip/$ip"; |
}; |
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warn "$mac IP changed to $ip"; |
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} |
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print "$mac NEW $ip\n"; |
symlink "$conf/mac/$mac", "$ip_path/mac"; |
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return $ip; |
return $ip; |
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} |
} |
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use log; |
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use config; |
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use pxelinux; |
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use client; |
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our $file; |
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our $transaction = 0; # FIXME predictible transaction numbers |
our $transaction = 0; # FIXME predictible transaction numbers |
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sub process_packet { |
sub process_packet { |
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my $sock = shift; |
my $sock = shift; |
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server->refresh; |
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my $buf; |
my $buf; |
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$sock->recv($buf, 1024); |
$sock->recv($buf, 1024); |
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my $size = 'empty'; |
my $size = 'empty'; |
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$size = length($buf) . ' bytes' if defined $buf; |
$size = length($buf) . ' bytes' if defined $buf; |
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print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n"; |
print "packet from ",$sock->peerhost,":",$sock->peerport," $size\n" if $debug; |
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return unless $buf; |
return unless $buf; |
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my $dhcp = Net::DHCP::Packet->new($buf); |
my $dhcp = Net::DHCP::Packet->new($buf); |
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$dhcp->comment( $transaction++ ); |
$dhcp->comment( $transaction++ ); |
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warn "recv: ", $dhcp->toString; |
warn "recv: ", $dhcp->toString if $debug; |
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my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
my $mac = substr($dhcp->chaddr(),0,$dhcp->hlen()*2); |
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my $ip = client_ip($mac); |
my $ip = client_ip($mac); |
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=cut |
=cut |
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config::for_ip( $ip ); |
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my $packet = { |
my $packet = { |
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Op => BOOTREPLY(), |
Op => BOOTREPLY(), |
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Hops => $dhcp->hops(), |
Hops => $dhcp->hops(), |
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Giaddr => $dhcp->giaddr(), |
Giaddr => $dhcp->giaddr(), |
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Chaddr => $dhcp->chaddr(), |
Chaddr => $dhcp->chaddr(), |
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File => $file, |
File => $file, |
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DHO_DHCP_SERVER_IDENTIFIER() => $server::ip, # busybox/udhcpc needs it but doesn't request |
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}; |
}; |
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my $options = { |
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DHO_SUBNET_MASK() => $server::netmask, |
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DHO_ROUTERS() => $server::ip, |
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DHO_DOMAIN_NAME() => $server::domain_name, |
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DHO_NAME_SERVERS() => $server::ip, |
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DHO_DOMAIN_NAME_SERVERS() => $server::ip, |
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DHO_HOST_NAME() => client::conf( $ip, 'hostname' ), |
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DHO_BROADCAST_ADDRESS() => $server::bcast, |
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# DHO_NTP_SERVERS() => '', |
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}; |
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my @requested = split(/\s/, $dhcp->getOptionValue(DHO_DHCP_PARAMETER_REQUEST_LIST)); |
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warn "options ",dump( $options ), ' requested: ',dump( @requested ) if $debug; |
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my @missing; |
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foreach ( @requested ) { |
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if ( defined $options->{$_} ) { |
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$packet->{$_} = $options->{$_}; |
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} else { |
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push @missing, $_; |
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} |
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} |
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warn "W: options requested but missing: ",dump( @missing ),$/; |
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foreach my $opt ( 'magic', 'config_file', 'path_prefix', 'reboot_time' ) { |
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my $DH0 = eval 'DHO_PXELINUX_' . uc $opt; |
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warn "DH0: $@" if $@; |
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my $v = eval "\$pxelinux::$opt"; |
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warn "v: $@" if $@; |
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next unless defined $v; |
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warn "pxelinux dhcp option $opt = $DH0 = $v\n" if $debug; |
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$packet->{ $DH0 } = $v; |
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} |
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my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE()); |
my $messagetype = $dhcp->getOptionValue(DHO_DHCP_MESSAGE_TYPE()); |
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if ($messagetype eq DHCPDISCOVER()) { |
if ($messagetype eq DHCPDISCOVER()) { |
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warn "DHCP DISCOVER"; |
log::mac $mac, "DHCP DISCOVER"; |
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$packet->{Comment} = $dhcp->comment(); |
$packet->{Comment} = $dhcp->comment(); |
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$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER(); |
$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPOFFER(); |
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} elsif ($messagetype eq DHCPREQUEST()) { |
} elsif ($messagetype eq DHCPREQUEST()) { |
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my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS()); |
my $requested_ip = $dhcp->getOptionValue(DHO_DHCP_REQUESTED_ADDRESS()); |
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warn "DHCP REQUEST $requested_ip"; |
log::mac $mac, "DHCP REQUEST $requested_ip $ip $file"; |
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if ( $ip eq $requested_ip ) { |
if ( $ip eq $requested_ip ) { |
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$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK(); |
$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPACK(); |
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$packet->{DHO_DHCP_LEASE_TIME()} = 5 * 60; # 5 min |
$packet->{DHO_DHCP_LEASE_TIME()} = 5 * 60; # 5 min |
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# $packet->{DHO_DHCP_SERVER_IDENTIFIER()} = $server::ip; # FIXME |
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$packet->{DHO_SUBNET_MASK()} = '255.255.255.0'; |
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$packet->{DHO_ROUTERS()} = $server::ip; |
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# $packet->{DHO_DOMAIN_NAME()} = 'pxelator.lan'; |
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# $packet->{DHO_NAME_SERVERS()} = $server::ip; |
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# $packet->{DHO_ROOT_PATH()} = '/exports/foobar'; |
# $packet->{DHO_ROOT_PATH()} = '/exports/foobar'; |
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} else { |
} else { |
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$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK(); |
$packet->{DHO_DHCP_MESSAGE_TYPE()} = DHCPNAK(); |
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$packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip"; |
$packet->{DHO_DHCP_MESSAGE()} = "Bad request, expected $ip"; |
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} |
} |
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} elsif ($messagetype eq DHCPINFORM()) { |
} elsif ($messagetype eq DHCPINFORM()) { |
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warn "DHCP INFORM ignored"; |
log::mac $mac, "DHCP INFORM ignored"; |
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} else { |
} else { |
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warn "$messagetype igored (bootp?)"; |
log::mac $mac, "$messagetype igored (bootp?)"; |
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} |
} |
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warn ">> $mac == $ip server: $server::ip", $file ? " file: $file\n" : "\n"; |
warn ">> $mac == $ip server: $server::ip", $file ? " file: $file\n" : "\n" if $debug; |
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$packet = new Net::DHCP::Packet( %$packet ); |
$packet = new Net::DHCP::Packet( %$packet ); |
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warn "## ",$packet->toString(),"\n" if $debug; |
warn "send ",$packet->toString() if $debug; |
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my $reply = IO::Socket::INET->new( |
my $reply = IO::Socket::INET->new( |
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LocalAddr => $server::ip, |
LocalAddr => $server::ip, |
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print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n"; |
print "DHCP listen on ",$sock->sockhost,":",$sock->sockport,"\n"; |
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while (1) { |
while (1) { |
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Module::Refresh->refresh; |
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process_packet $sock; |
process_packet $sock; |
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} |
} |
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} |
} |
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warn "loaded"; |
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1; |
1; |