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IEC104.pm
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IEC104.pm
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package Net::IEC104;
use 5.008008;
use strict;
use warnings;
use Carp;
use IO::Socket::INET;
use Event::Lib;
use Date::Manip;
use Time::HiRes qw/ gettimeofday tv_interval /;
require Exporter;
our @ISA = qw(Exporter);
# Items to export into callers namespace by default. Note: do not export
# names by default without a very good reason. Use EXPORT_OK instead.
# Do not simply export all your public functions/methods/constants.
# This allows declaration use Net::IEC104 ':all';
# If you do not need this, moving things directly into @EXPORT or @EXPORT_OK
# will save memory.
our %EXPORT_TAGS = (
'all' => [
qw(
&connect &listen &send &main_loop &disconnect
)
]
);
our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
our @EXPORT = qw(
);
our $VERSION = '0.03';
###############################################################################
$| = 1;
our $debug = 0;
our $MAX_ASDU_SIZE = 248;
our $MAX_S_QUEUE = 100;
our %asdu_type = (
# Infromation to control direction, ASDU: 1-44
30 => {
"size" => 8,
"name" => "M_SP_TB_1",
type => "TS",
"parse_cb" => \&parse_asdu_type_0_44,
"write_cb" => \&send_asdu_type_0_44
},
35 => {
"size" => 10,
"name" => "M_ME_TE_1",
type => "TI",
"parse_cb" => \&parse_asdu_type_0_44,
"write_cb" => \&send_asdu_type_0_44
},
36 => {
"size" => 12,
"name" => "M_ME_TF_1",
type => "TI",
"parse_cb" => \&parse_asdu_type_0_44,
"write_cb" => \&send_asdu_type_0_44
},
37 => {
"size" => 12,
"name" => "M_IT_TB_1",
type => "TII",
"parse_cb" => \&parse_asdu_type_0_44,
"write_cb" => \&send_asdu_type_0_44
},
# System information to controlled direction, ASDU: 100-109
100 => {
"size" => 1,
"name" => "C_IC_NA_1",
type => "",
"parse_cb" => \&parse_asdu_type_100,
"write_cb" => \&send_asdu_type_100
},
103 => {
"size" => 7,
"name" => "C_CS_NA_1",
type => "",
"parse_cb" => \&parse_asdu_type_103,
"write_cb" => \&send_asdu_type_103
},
);
# Constructor
sub new {
my $self = shift;
my %h = @_;
my $class = ref($self) || $self;
croak "wrong type of Net::IEC104"
if ( $h{type} ne "slave" and $h{type} ne "master" );
$h{retry_timeout} = ( exists $h{retry_timeout} ) ? $h{retry_timeout} : 5;
$h{ip} = ( exists $h{ip} ) ? $h{ip} : "0.0.0.0";
$h{port} = ( exists $h{port} ) ? $h{port} : "2404";
bless \%h, $class;
}
# Print debug messages
sub DEBUG {
my $d = shift;
if ( $debug >= $d ) {
print @_;
if ( $d < 0 ) {
printf "<-- at %s:%s", (caller)[ 1, 2 ];
}
unless ( $_[$#_] =~ /\s$/ ) {
print "\n";
}
}
}
# Pack ip-port pair as ID of connection
sub get_id {
my $sock = shift;
return pack( "C4S", split( /\./, $sock->peerhost ), $sock->peerport );
}
# Unpack ip-port pair to printable form
sub sid2hex {
return join( ".", map { sprintf "%d", $_ } unpack( "C4S", shift ) );
}
# Print hex-codes of raw data
sub raw2hex {
return join( ",", map { sprintf "%02X", $_ } unpack( "C*", shift ) );
}
# convert from cp56_2a format of time to gettimeofday
sub cp56_2a_2_time {
my $data = shift;
my @tm = unpack( "SC5", $data );
my $tm = Date_SecsSince1970GMT(
$tm[4] & 0xF,
$tm[3] & 0x1F,
2000 + ( $tm[5] & 0x7F ),
$tm[2] & 0x1F,
$tm[1] & 0x3F,
int( $tm[0] / 1000 )
);
my $ms = ( $tm[0] % 1000 ) * 1000;
return ( $tm, $ms );
}
# convert from gettimeofday format to cp56_2a
sub time_2_cp56_2a {
my $tm = shift;
my $ms = shift;
$ms = int( $ms / 1000 );
my @tm = localtime($tm);
return pack( "SC5",
( $tm[0] * 1000 + $ms ),
$tm[1],
$tm[2] | ( $tm[8] << 7 ),
$tm[3] | ( $tm[6] << 5 ),
++$tm[4], $tm[5] % 100 );
}
# debug info about connection
sub sidinfo {
my $self = shift;
my $sid = shift;
my $report;
my $s = \%{ $self->{sids}{$sid} };
$report =
"=====================\n"
. "TYPE: "
. $s->{type} . "\n"
. sprintf( "IP: %d.%d.%d.%d\n" . "PORT: %d\n", unpack( "C4S", $sid ) )
. "UFUNC: "
. $s->{ufunc} . "\n"
. "VS: "
. $s->{vs} . "\n"
. "VR: "
. $s->{vr} . "\n"
. "AS: "
. $s->{as} . "\n"
. "AR: "
. $s->{ar} . "\n"
. "s_queue: "
. $#{ $s->{s_queue} } . "\n";
foreach my $timer (
"t0_timer", "t1_timer", "t2_timer", "t3_timer",
"ci_timer", "sync_timer"
)
{
$report .= $timer . ": ";
if ( $s->{$timer}->pending ) {
$report .= "pending\n";
}
else {
$report .= "not started\n";
}
}
return $report;
}
# public method listen()
# start IEC slave station (server)
sub listen {
my $self = shift;
my %h = @_;
carp "called without a reference" if ( !ref($self) );
my $server = IO::Socket::INET->new(
LocalAddr => $self->{ip},
LocalPort => $self->{port},
Proto => 'tcp',
ReuseAddr => SO_REUSEADDR,
Listen => 1,
Blocking => 0,
) or carp $@;
return -1 unless ($server);
&DEBUG( 1, "Listen on ", $self->{ip}, ":", $self->{port} );
my $main =
event_new( $server, EV_READ | EV_PERSIST, \&handle_incoming, $self );
$main->add;
}
# public method connect()
# start IEC master session
sub connect {
my $self = shift;
carp "called without a reference" if ( !ref($self) );
my $client = IO::Socket::INET->new(
Proto => 'tcp',
PeerAddr => $self->{ip},
PeerPort => $self->{port},
Blocking => 0
) or carp $@;
my $main = event_new( $client, EV_WRITE, \&on_connect, $self );
$main->add(2);
}
sub on_connect {
my ( $e, $type, $self ) = @_;
my $error = 1;
if ( $type == EV_TIMEOUT ) {
&DEBUG( 0, "Can't connect to ",
$self->{ip}, ":", $self->{port}, ", connection timeout" );
}
elsif ( $type == EV_WRITE ) {
my $client = $e->fh;
unless ( $client->connected ) {
&DEBUG( 0, "Can't connect to ",
$self->{ip}, ":", $self->{port}, ", connection rejected" );
}
else {
$self->{retry_count} = 0;
$error = 0;
&DEBUG( 1, "connected to ", $self->{ip}, ":", $self->{port} );
my $sid = &get_id($client);
my $main = event_new( $client, EV_READ | EV_PERSIST,
\&handle_client, $self, $sid );
$self->init_new_conn(
sid => $sid,
event => $main,
type => "MASTER"
);
$main->add;
$self->frame_u_send( $sid, "STARTDTACT" );
}
}
if ( $error && $self->{persist} ) {
my $timer = timer_new( \&reconnect, $self );
$timer->add( $self->{retry_timeout} );
}
}
# Main event loop
sub main_loop {
event_mainloop;
}
# Sync time
sub sync_time {
my ( $cause, $s, $data );
my $self = shift;
my $csid = undef;
if ( $#_ != -1 && defined( $_[0] ) ) {
$csid = shift;
}
if ( $self->{type} eq "master" ) {
$cause = 6; # activation
}
else {
$cause = 3; # sporadic
}
foreach my $sid ( keys %{ $self->{sids} } ) {
next if ( defined($csid) && $csid ne $sid );
$s = \%{ $self->{sids}{$sid} };
&DEBUG( 2, "Sync time for CA: ",
$s->{ca}, ", My current time: ", time() );
$data =
pack( "C2S3C", 103, 1, $cause, $s->{ca}, 1, 0 )
. &time_2_cp56_2a(gettimeofday);
$self->frame_i_send( $sid, $data );
}
}
# handle incoming connections
sub handle_incoming {
my $e = shift;
my $etype = shift;
my $self = shift;
my $h = $e->fh;
my $client = $h->accept or croak "$!";
$client->blocking(0);
&DEBUG( 1, "accept connection from ",
$client->peerhost, ":", $client->peerport );
my $sid = &get_id($client);
# set up a new event that watches the client socket
my $event =
event_new( $client, EV_READ | EV_PERSIST, \&handle_client, $self, $sid );
$self->init_new_conn(
sid => $sid,
event => $event,
type => "SLAVE"
);
$event->add;
}
# init new structure for connection
sub init_new_conn {
my $self = shift;
my %h = @_;
my $sid = $h{"sid"} or croak $@;
$self->{sids}{$sid} = ();
my $s = \%{ $self->{sids}{$sid} };
$s->{type} = ( $h{type} ) ? $h{type} : "SLAVE";
$s->{event} = $h{"event"} or croak $@;
$s->{ufunc} = ( $self->{ufunc} ) ? $self->{ufunc} : "STOPDT";
$s->{ca} = ( $self->{ca} ) ? $self->{ca} : 1; # common address of asdu
$s->{t0} = ( $self->{t0} ) ? $self->{t0} : 30; # t0 timeout, sec
$s->{t1} = ( $self->{t1} ) ? $self->{t1} : 15; # t1 timeout, sec
$s->{t2} = ( $self->{t2} ) ? $self->{t2} : 10; # t2 timeout, sec
$s->{t3} = ( $self->{t3} ) ? $self->{t3} : 20; # t3 timeout, sec
$s->{w} = ( $self->{w} ) ? $self->{w} : 8; # w
$s->{k} = ( $self->{k} ) ? $self->{k} : 12; # k
$s->{vs} = 0; # Number S sended
$s->{vr} = 0; # Number S received
$s->{as} = 0; # Number S ack by me
$s->{ar} = 0; # Number S ack by peer
$s->{rcb} =
( $self->{read_callback} ) ? $self->{read_callback} : \&default_read_cb;
$s->{wcb} =
( $self->{write_callback} )
? $self->{write_callback}
: \&default_write_cb;
$s->{ts_fn} = ( $self->{ts_func_num} ) ? $self->{ts_func_num} : 30;
$s->{ti_fn} = ( $self->{ti_func_num} ) ? $self->{ti_func_num} : 36;
$s->{tii_fn} = ( $self->{tii_func_num} ) ? $self->{tii_func_num} : 37;
$s->{s_queue} = []; # Send queue
$s->{r_buf} = undef; # Receive buffer
$s->{t0_timer} = timer_new( \&t0_timer_run, $self, $sid );
$s->{t1_timer} = timer_new( \&t1_timer_run, $self, $sid );
$s->{t2_timer} = timer_new( \&t2_timer_run, $self, $sid );
$s->{t3_timer} = timer_new( \&t3_timer_run, $self, $sid );
$s->{ci_timeout} =
( $self->{ci_timeout} ) ? $self->{ci_timeout} : 5 * 60; # CI timeout, sec
$s->{sync_timeout} =
( $self->{sync_timeout} )
? $self->{sync_timeout}
: 60 * 60; # Sync timeout, sec
$s->{ci_timer} = timer_new( \&ci_timer_run, $self, $sid );
$s->{sync_timer} = timer_new( \&sync_timer_run, $self, $sid );
$s->{time_diff} = 0; # diff in time between kp and control station
$s->{t0_timer}->add( $s->{t0} ); # timeout of init connection
}
# Invoked when the client's socket becomes readable
sub handle_client {
my $data;
my $e = shift;
my $etype = shift;
my $self = shift;
my $sid = shift;
my $h = $e->fh;
my $s = \%{ $self->{sids}{$sid} };
unless ( $h->connected ) {
&DEBUG( 9, "client disconnected" );
$self->disconnect($sid);
return;
}
if ( eof($h) ) {
&DEBUG( 1, "connection not readable" );
$self->disconnect($sid);
return;
}
if ( defined( $self->{sids}{$sid}{r_buf} ) ) {
$data = $s->{r_buf};
$s->{r_buf} = undef;
}
while (<$h>) {
$data .= $_;
}
my ( $start, $length, $bits ) = unpack( "C3", $data );
while (1) {
if ( $start != 0x68 || length($data) < 3 ) {
#error in Net::IEC104 packet
&DEBUG( 11, raw2hex($data) );
&DEBUG(
1,
"error in Net::IEC104 chunk: START: ",
$start,
"; LENGTH: ",
defined($length) ? $length : 0,
"; DATA SIZE: ",
length($data)
);
$self->disconnect($sid);
return;
}
# retransmission (part of data will be received in next packet)
# put data in receive buffer
if ( $length > length($data) - 2 ) {
&DEBUG( 2,
"receive fragmented packet, save data in buffer and wait next chunk"
);
&DEBUG( 2, "LENGTH: ", length($data) - 2,
" of ", $length, " bytes" );
$s->{r_buf} = $data;
return;
}
my $curdata = substr( $data, 0, $length + 2 );
&DEBUG( 11, raw2hex($curdata) );
# Receiving packet of any type restart a T3 timer
if ( $s->{t3_timer}->pending ) {
$s->{t3_timer}->remove;
}
$s->{t3_timer}->add( $s->{t3} );
if ( ( $bits & 1 ) == 0 ) {
# frame type I
$self->frame_i_recv( $sid, $curdata );
}
elsif ( ( $bits & 3 ) == 1 ) {
# frame type S
$self->frame_s_recv( $sid, $curdata );
}
elsif ( ( $bits & 3 ) == 3 ) {
# frame type U
$self->frame_u_recv( $sid, $curdata );
}
else {
&DEBUG( 0, "unknown frame type" );
}
$data = substr( $data, $length + 2 );
return unless ($data);
( $start, $length, $bits ) = unpack( "C3", $data );
}
}
# public method disconnect()
# close client or server connection
sub disconnect {
my $self = shift;
my ( $e, $h );
my $csid = undef;
if ( $#_ != -1 && defined( $_[0] ) ) {
$csid = shift;
}
foreach my $sid ( keys %{ $self->{sids} } ) {
next if ( defined($csid) && $csid ne $sid );
$e = $self->{sids}{$sid}{event};
$h = $e->fh;
&DEBUG( 1, "disconnected from ", &sid2hex($sid) );
close $h;
$e->remove;
$self->{sids}{$sid}{t0_timer}->remove;
$self->{sids}{$sid}{t1_timer}->remove;
$self->{sids}{$sid}{t2_timer}->remove;
$self->{sids}{$sid}{t3_timer}->remove;
$self->{sids}{$sid}{ci_timer}->remove;
$self->{sids}{$sid}{sync_timer}->remove;
delete $self->{sids}{$sid};
if ( $self->{type} eq "master" && $self->{persist} != 0 ) {
&DEBUG( 11, "persist is true, reconnect..." );
$self->connect();
}
else {
&DEBUG( 11, "persist is not true, dont reconnect..." );
}
}
}
sub reconnect {
my $e = shift;
my $etype = shift;
my $self = shift;
my $timer;
$self->{retry_count}++;
&DEBUG(
1, "reconnect to ",
$self->{ip}, ":", $self->{port}, " after fail... Attempt: ",
$self->{retry_count}
);
$self->connect;
}
# public method send()
# send spontaneous data to all client connections (only for SLAVE)
sub send {
my $self = shift;
my $ca = shift;
my %h = @_;
return if ( $self->{type} ne "slave" );
foreach my $sid ( keys %{ $self->{sids} } ) {
next
if ( !defined( $self->{sids}{$sid} )
|| $self->{sids}{$sid}{ufunc} eq "STOPDT"
|| $self->{sids}{$sid}{ca} != $ca );
if ( exists $h{"TI"} && $self->{sids}{$sid}{ti_fn} != 0 ) {
&{ $asdu_type{ $self->{sids}{$sid}{ti_fn} }{write_cb} }( $self,
$sid, 3, $self->{sids}{$sid}{ti_fn}, $h{"TI"} );
}
if ( exists $h{"TS"} && $self->{sids}{$sid}{ts_fn} != 0 ) {
&{ $asdu_type{ $self->{sids}{$sid}{ts_fn} }{write_cb} }( $self,
$sid, 3, $self->{sids}{$sid}{ts_fn}, $h{"TS"} );
}
if ( exists $h{"TII"} && $self->{sids}{$sid}{tii_fn} != 0 ) {
&{ $asdu_type{ $self->{sids}{$sid}{tii_fn} }{write_cb} }( $self,
$sid, 3, $self->{sids}{$sid}{tii_fn}, $h{"TII"} );
}
}
}
sub t0_timer_run {
my $e = shift;
my $type = shift;
my $self = shift;
my $sid = shift;
&DEBUG( 1, "sid: ", &sid2hex($sid), ". t0 timer run" );
$self->disconnect($sid);
}
sub t1_timer_run {
my $e = shift;
my $type = shift;
my $self = shift;
my $sid = shift;
&DEBUG( 1, "sid: ", &sid2hex($sid), ". t1 timer run" );
$self->disconnect($sid);
}
sub t2_timer_run {
my $e = shift;
my $type = shift;
my $self = shift;
my $sid = shift;
&DEBUG( 2, "t2 timer run" );
$self->frame_s_send($sid);
}
sub t3_timer_run {
my $e = shift;
my $type = shift;
my $self = shift;
my $sid = shift;
my $s = \%{ $self->{sids}{$sid} };
&DEBUG( 1, "sid: ", &sid2hex($sid), ". t3 timer run" );
$self->frame_u_send( $sid, "TESTFRACT" );
unless ( $s->{t1_timer}->pending ) {
$s->{t1_timer}->add( $s->{t1} );
}
}
sub ci_timer_run {
my $e = shift;
my $type = shift;
my $self = shift;
my $sid = shift;
&DEBUG( 1, "sid: ", &sid2hex($sid), ". ci timer run" );
$self->frame_i_send( $sid,
pack( "C2S3C2", 100, 1, 6, $self->{sids}{$sid}{ca}, 0, 0, 20 ) );
}
sub sync_timer_run {
my $e = shift;
my $type = shift;
my $self = shift;
my $sid = shift;
&DEBUG( 1, "sid: ", &sid2hex($sid), ". sync timer run" );
$self->sync_time($sid);
}
# send frame type U
sub frame_u_send {
my $self = shift;
my $sid = shift;
my $func = shift;
my $bits = 3;
&DEBUG( 3, "send frame type U, function ", $func, ": " );
if ( $func eq "STARTDTACT" ) {
$bits |= 1 << 2;
}
elsif ( $func eq "STARTDTCON" ) {
$bits |= 1 << 3;
}
elsif ( $func eq "STOPDTACT" ) {
$bits |= 1 << 4;
}
elsif ( $func eq "STOPDTCON" ) {
$bits |= 1 << 5;
}
elsif ( $func eq "TESTFRACT" ) {
$bits |= 1 << 6;
}
elsif ( $func eq "TESTFRCON" ) {
$bits |= 1 << 7;
}
return unless ( defined( $self->{sids}{$sid}{event} ) );
my $sock = $self->{sids}{$sid}{event}->fh;
my $data = pack( "C6", 0x68, 4, $bits, 0, 0, 0 );
&DEBUG( 3, raw2hex($data) );
print $sock $data;
}
sub frame_u_recv {
my $self = shift;
my $sid = shift;
my $data = shift;
my ($bits) = ( unpack( "C3", $data ) )[2];
&DEBUG( 3, "received frame type U, function " );
if ( $bits & 1 << 2 ) {
# STARTDT ACT
&DEBUG( 3, "STARTDTACT" );
if ( $self->{sids}{$sid}{type} ne "SLAVE" ) {
&DEBUG( 0, "master receive STARTDT ACT" );
return -1;
}
# T0 timer removed after init
$self->{sids}{$sid}{t0_timer}->remove;
$self->{sids}{$sid}{ufunc} = "STARTDT";
$self->frame_u_send( $sid, "STARTDTCON" );
}
elsif ( $bits & 1 << 3 ) {
# STARTDT CON
&DEBUG( 3, "STARTDTCON" );
if ( $self->{sids}{$sid}{type} ne "MASTER" ) {
return -1;
}
# Slave answer on init -> remove T0 timer
$self->{sids}{$sid}{t0_timer}->remove;
$self->{sids}{$sid}{ufunc} = "STARTDT";
# Connection activated.
# Sync time
$self->sync_time($sid);
# Start common interogation
$self->frame_i_send( $sid,
pack( "C2S3C2", 100, 1, 6, $self->{sids}{$sid}{ca}, 0, 0, 20 ) );
}
elsif ( $bits & 1 << 4 ) {
# STOPDT ACT
&DEBUG( 3, "STOPDTACT" );
if ( $self->{sids}{$sid}{type} ne "SLAVE" ) {
return -1;
}
$self->{sids}{$sid}{ufunc} = "STOPDT";
$self->frame_u_send( $sid, "STOPDTCON" );
}
elsif ( $bits & 1 << 5 ) {
# STOPDT CON
&DEBUG( 3, "STOPDTCON" );
if ( $self->{sids}{$sid}{type} ne "MASTER" ) {
return -1;
}
$self->{sids}{$sid}{ufunc} = "STOPDT";
}
elsif ( $bits & 1 << 6 ) {
# TESTFR ACT
&DEBUG( 3, "TESTFRACT" );
$self->frame_u_send( $sid, "TESTFRCON" );
}
elsif ( $bits & 1 << 7 ) {
# TESTFR CON
&DEBUG( 3, "TESTFRCON" );
$self->{sids}{$sid}{t1_timer}->remove;
}
else {
&DEBUG( 3, "unknown" );
&DEBUG( 0, "Error in received U frame: unknown type" );
}
}
# send frame type S
sub frame_s_send {
my $self = shift;
my $sid = shift;
if ( $self->{sids}{$sid}{as} == $self->{sids}{$sid}{vr} ) {
&DEBUG(
2,
"not sending frame type S, AS=VR (",
$self->{sids}{$sid}{as},
"=", $self->{sids}{$sid}{vr}, ")"
);
return;
}
&DEBUG( 3, "send frame type S(", $self->{sids}{$sid}{vr}, ")" );
my $sock = $self->{sids}{$sid}{event}->fh;
print $sock pack( "C4S", 0x68, 4, 1, 0, $self->{sids}{$sid}{vr} << 1 );
$self->{sids}{$sid}{as} = $self->{sids}{$sid}{vr};
}
# receive frame type S
sub frame_s_recv {
my $self = shift;
my $sid = shift;
my $data = shift;
my ($nr) = ( unpack( "C2S2", $data ) )[3];
$nr >>= 1;
if ( ( ( $self->{sids}{$sid}{vs} - $nr + 32768 ) % 32768 ) >
$self->{sids}{$sid}{k} )
{
&DEBUG(
0, "wrong N(R) number in S-ack received: ",
$nr,
". Current N(S) = ",
$self->{sids}{$sid}{vs}
);
$self->disconnect($sid);
return;
}
&DEBUG( 3, "received frame type S(", $nr, ")" );
$self->{sids}{$sid}{ar} = $nr;
$self->{sids}{$sid}{t1_timer}->remove;
$self->flush_send_queue($sid);
}
sub flush_send_queue {
my $ret;
my $self = shift;
my $sid = shift;
#return if ($#{$self->{sids}{$sid}{s_queue}} == -1);
#for my $i (0 .. $#{$self->{sids}{$sid}{s_queue}}) {
#$ret = $self->frame_i_send($sid,undef);
#last if ($ret != 0);
#}
while ( $#{ $self->{sids}{$sid}{s_queue} } != -1 ) {
last if ( $self->frame_i_send( $sid, undef ) );
}
}
sub frame_i_send {
my $self = shift;
my $sid = shift;
my $asdu = shift;
unless ( exists( $self->{sids}{$sid} ) ) {
&DEBUG( 0, "frame_i_send(): error, connection ",
&sid2hex($sid), " already dead\n" );
for my $j ( 0 .. 3 ) {
&DEBUG( 0, join( "->", ( caller($j) )[ 0, 1, 2, 3 ] ) );
}
return -1;
}
if ( $self->{sids}{$sid}{vs} ==
( $self->{sids}{$sid}{ar} + $self->{sids}{$sid}{k} ) % 32768 )
{
&DEBUG( 2, "reached k, no frames will be sent" );
if ( $#{ $self->{sids}{$sid}{s_queue} } + 1 > $MAX_S_QUEUE ) {
&DEBUG( 0, $self->sidinfo($sid) );
&DEBUG( 0, "send queue overloaded, asdu dropped" );
$self->disconnect($sid);
return 2;
}
elsif ( defined($asdu) ) {
push @{ $self->{sids}{$sid}{s_queue} }, $asdu;
if ( $self->{sids}{$sid}{type} eq "SLAVE"
&& $#{ $self->{sids}{$sid}{s_queue} } > $MAX_S_QUEUE * 0.9 )
{
&DEBUG(
0, &sid2hex($sid),
", queue increased: ",
( $#{ $self->{sids}{$sid}{s_queue} } + 1 )
);
}
&DEBUG(
2,
"asdu queued (No:",
$#{ $self->{sids}{$sid}{s_queue} } + 1, ")"
);
}
return 1;
}
unless ( defined($asdu) ) {
$asdu = shift( @{ $self->{sids}{$sid}{s_queue} } )
if ( $#{ $self->{sids}{$sid}{s_queue} } >= 0 );
unless ( defined($asdu) ) {
&DEBUG( 0, "Error: empty asdu" );
return 3;
}
else {
if ( $self->{sids}{$sid}{type} eq "SLAVE"
&& $#{ $self->{sids}{$sid}{s_queue} } > $MAX_S_QUEUE * 0.9 )
{
&DEBUG(
0, &sid2hex($sid),
", queue reduced: ",
( $#{ $self->{sids}{$sid}{s_queue} } + 1 )
);
}
&DEBUG( 3, "send frame type I from queue: " );
}
}
else {
&DEBUG( 3, "send frame type I: " );
}
$self->{sids}{$sid}{t1_timer}->remove;
$self->{sids}{$sid}{t1_timer}->add( $self->{sids}{$sid}{t1} );
my $ns = $self->{sids}{$sid}{vs} << 1;
my $nr = $self->{sids}{$sid}{vr} << 1;
my $sock = $self->{sids}{$sid}{event}->fh;
my $data = pack( "C2S2", 0x68, 4 + length($asdu), $ns, $nr ) . $asdu;
DEBUG( 3, raw2hex($data) );
print $sock $data;
$self->{sids}{$sid}{vs} = ( $self->{sids}{$sid}{vs} + 1 ) % 32768;
return 0;
}
sub frame_i_recv {
my $self = shift;
my $sid = shift;
my $data = shift;
DEBUG( 3, "received frame type I " );
if ( $self->{sids}{$sid}{ufunc} ne "STARTDT" ) {
DEBUG( 0, "Error: no STARTDT in current connection" );
return -1;
}
my ( $ns, $nr ) = ( unpack( "C2S2", $data ) )[ 2, 3 ];
$ns >>= 1;
$nr >>= 1;
DEBUG( 3, "NS=$ns,NR=$nr" );
if ( $ns != $self->{sids}{$sid}{vr} ) {
&DEBUG(
0,
"Error: Expect N(S)=",
$self->{sids}{$sid}{vr},
", but receive: ",
$ns, ". Packet lost or reordered"
);
return -1;
}
if ( ( $nr != $self->{sids}{$sid}{ar} )
&& ( ( $nr - $self->{sids}{$sid}{ar} + 32768 ) % 32768 ) <=
$self->{sids}{$sid}{k}
&& ( ( $self->{sids}{$sid}{vs} - $nr + 32768 ) % 32768 ) <=
$self->{sids}{$sid}{k} )
{
$self->{sids}{$sid}{ar} = $nr;
$self->{sids}{$sid}{t1_timer}->remove;
}
$self->{sids}{$sid}{t2_timer}->remove();
$self->{sids}{$sid}{t2_timer}->add( $self->{sids}{$sid}{t2} );
$self->{sids}{$sid}{vr} = ( $ns + 1 ) % 32768;
if (
( $self->{sids}{$sid}{vr} - $self->{sids}{$sid}{as} + 32768 ) % 32768 ==
$self->{sids}{$sid}{w} )
{
$self->frame_s_send($sid);
}
$self->parse_asdu( $sid, substr( $data, 6 ) );
}
sub parse_asdu {
my $self = shift;
my $sid = shift;
my $asdu = shift;
my $i = \%{ $self->{sids}{$sid}{i} };
my $kps;
&DEBUG( 12, "parse_asdu(): ", raw2hex($asdu) );
( $i->{id}, $kps, $i->{cause}, $i->{ca} ) = unpack( "C2S2", $asdu );
$i->{sq} = ( $kps & 1 << 7 ) >> 7;
$i->{nobj} = $kps & 0x7F;
$i->{cause} &= 0xFF;
&DEBUG( 3, "ID: ", sprintf( "%02X", $i->{id} ), ", " );
&DEBUG( 3, "SQ: ", $i->{sq}, ", " );
&DEBUG( 3, "NObj: ", sprintf( "%02X", $i->{nobj} ), ", " );
&DEBUG( 3, "Cause: ", sprintf( "%02X", $i->{cause} ), ", " );
&DEBUG( 3, "C.Addr ASDU: ", sprintf( "%02X", $i->{ca} ) );
unless ( exists $asdu_type{ $i->{id} } ) {
&DEBUG( -1, "not implemented type ", $i->{id} );
return;
}
if ( $i->{sq} == 0 ) {
# Numerous information objects
for my $j ( 1 .. $i->{nobj} ) {
my $k = ( $j - 1 ) * ( 3 + $asdu_type{ $i->{id} }{size} );
( $i->{obj}{$j}{ioa}, $i->{obj}{$j}{ioa2} ) =
unpack( "SC", substr( $asdu, 6 + $k, 3 ) );
$i->{obj}{$j}{data} =
substr( $asdu, 6 + 3 + $k, $asdu_type{ $i->{id} }{size} );
}
}
else {
# One object, numerous elements
# <{TODO}>
&DEBUG( -1, "not implemented code" );
}
&{ $asdu_type{ $i->{id} }{parse_cb} }( $self, $sid );
}
sub default_read_cb {
DEBUG( 1, "default_read_cb()" );
}
sub default_write_cb {
DEBUG( 1, "default_write_cb()" );
return ( "TS" => { "1" => [ "0", gettimeofday ] } );
}
sub parse_asdu_type_100 {
my $self = shift;
my $sid = shift;
my $s = \%{ $self->{sids}{$sid} };
my $i = \%{ $s->{i} };
if ( $i->{cause} == 6 ) {
&DEBUG( 0, &sid2hex($sid), " [100] activation" );
# drop outgoing queue