/usr/share/perl5/INetSim/NTP.pm is in inetsim 1.2.7+dfsg.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# INetSim::NTP - A fake NTP server
#
# RFC 1305, 2030 - (Simple) Network Time Protocol v1-4
#
# (c)2007-2013 Matthias Eckert, Thomas Hungenberg
#
# Version 0.49 (2009-08-28)
#
# For history/changelog see bottom of this file.
#
#############################################################
package INetSim::NTP;
use strict;
use warnings;
use Time::HiRes;
use base qw(INetSim::GenericServer);
use constant NTP_ADJ => 2208988800;
sub configure_hook {
my $self = shift;
$self->{server}->{host} = &INetSim::Config::getConfigParameter("Default_BindAddress"); # bind to address
$self->{server}->{port} = &INetSim::Config::getConfigParameter("NTP_BindPort"); # bind to port
$self->{server}->{proto} = 'udp'; # UDP protocol
$self->{server}->{user} = &INetSim::Config::getConfigParameter("Default_RunAsUser"); # user to run as
$self->{server}->{group} = &INetSim::Config::getConfigParameter("Default_RunAsGroup"); # group to run as
$self->{server}->{setsid} = 0; # do not daemonize
$self->{server}->{no_client_stdout} = 1; # do not attach client to STDOUT
$self->{server}->{log_level} = 0; # do not log anything
# $self->{server}->{udp_recv_len} = 960; # default is 4096
$self->{servicename} = &INetSim::Config::getConfigParameter("NTP_ServiceName");
$self->{max_childs} = &INetSim::Config::getConfigParameter("Default_MaxChilds");
$self->{server_ip} = &INetSim::Config::getConfigParameter("NTP_Server_IP");
$self->{strict_checks} = &INetSim::Config::getConfigParameter("NTP_StrictChecks");
}
sub pre_loop_hook {
my $self = shift;
$0 = "inetsim_$self->{servicename}";
&INetSim::Log::MainLog("started (PID $$)", $self->{servicename});
}
sub pre_server_close_hook {
my $self = shift;
&INetSim::Log::MainLog("stopped (PID $$)", $self->{servicename});
}
sub fatal_hook {
my $self = shift;
&INetSim::Log::MainLog("failed!", $self->{servicename});
exit 0;
}
sub process_request {
my $self = shift;
my $client = $self->{server}->{client};
my $rhost = $self->{server}->{peeraddr};
my $rport = $self->{server}->{peerport};
my $stat_success = 0;
my $diff_seconds = 0;
##### init for variables
my $recvmsg = "";
my $sendmsg = "";
my $ReceiveTime = 0;
my $cur_time = 0;
my $valid = 1;
##### client
my $C_Byte1 = 0;
my $C_Leap_Indicator = 0;
my $C_NTP_Version = 0;
my $C_Mode = 0;
my $C_Stratum = 0;
my $C_Poll = 0;
my $C_Precision = 0;
my $C_Root_Delay_w1 = 0;
my $C_Root_Delay_w2 = 0;
my $C_Root_Delay = 0;
my $C_Root_Dispersion_w1 = 0;
my $C_Root_Dispersion_w2 = 0;
my $C_Root_Dispersion = 0;
my $C_Reference_Clock_Identifier = 0;
my $C_Reference_Time_w1 = 0;
my $C_Reference_Time_w2 = 0;
my $C_Reference_Time = 0;
my $C_Originate_Time_w1 = 0;
my $C_Originate_Time_w2 = 0;
my $C_Originate_Time = 0;
my $C_Receive_Time_w1 = 0;
my $C_Receive_Time_w2 = 0;
my $C_Receive_Time = 0;
my $C_Transmit_Time_w1 = 0;
my $C_Transmit_Time_w2 = 0;
my $C_Transmit_Time = 0;
##### server
my $S_Byte1 = 0;
my $S_Leap_Indicator = 0;
my $S_NTP_Version = 4;
my $S_Mode = 2;
my $S_Stratum = 2;
my $S_Poll = 6;
my $S_Precision = -20;
my $S_Root_Delay_w1 = 0;
my $S_Root_Delay_w2 = 0;
my $S_Root_Delay = 0;
my $S_Root_Dispersion_w1 = 0;
my $S_Root_Dispersion_w2 = 0;
my $S_Root_Dispersion = 0;
my $S_Reference_Clock_Identifier = unpack("N", pack("C4", split(/\./, $self->{server_ip})));
my $S_Reference_Time_w1 = 0;
my $S_Reference_Time_w2 = 0;
my $S_Reference_Time = 0;
my $S_Originate_Time_w1 = 0;
my $S_Originate_Time_w2 = 0;
my $S_Originate_Time = 0;
my $S_Receive_Time_w1 = 0;
my $S_Receive_Time_w2 = 0;
my $S_Receive_Time = 0;
my $S_Transmit_Time_w1 = 0;
my $S_Transmit_Time_w2 = 0;
my $S_Transmit_Time = 0;
&INetSim::Log::SubLog("[$rhost:$rport] connect", $self->{servicename}, $$);
if ($self->{server}->{numchilds} >= $self->{max_childs}) {
print $client "Maximum number of connections ($self->{max_childs}) exceeded.\n";
&INetSim::Log::SubLog("[$rhost:$rport] Connection refused - maximum number of connections ($self->{max_childs}) exceeded.", $self->{servicename}, $$);
}
else {
$recvmsg = $self->{server}->{udp_data};
# check packet length - valid packets must be 48 or 68 bytes long
if (length($recvmsg) != 48 && length($recvmsg) != 68) {
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (packet length is not 48 or 68 bytes)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# if packet size equals to 68, drop the last 20 bytes
if (length($recvmsg) == 68) {
$recvmsg = substr($recvmsg, 0, 48);
}
# arrival time of the client packet
$ReceiveTime = &INetSim::FakeTime::get_faketime();
# split the packet
(
$C_Byte1,
$C_Stratum,
$C_Poll,
$C_Precision,
$C_Root_Delay_w1,
$C_Root_Delay_w2,
$C_Root_Dispersion_w1,
$C_Root_Dispersion_w2,
$C_Reference_Clock_Identifier,
$C_Reference_Time_w1,
$C_Reference_Time_w2,
$C_Originate_Time_w1,
$C_Originate_Time_w2,
$C_Receive_Time_w1,
$C_Receive_Time_w2,
$C_Transmit_Time_w1,
$C_Transmit_Time_w2
) = unpack ("C3 c n B16 n B16 a4 N B32 N B32 N B32 N B32", $recvmsg);
# if byte 1 is zero -> abort
if (! $C_Byte1) {
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (first byte is zero)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# originate timestamp AND receive timestamp must not be zero
if ($self->{strict_checks} && ($C_Originate_Time_w1 || $C_Receive_Time_w1)) {
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (originate and/or receive timestamps are not zero)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# split byte 1
$C_Leap_Indicator = ($C_Byte1 & 192) >> 6;
$C_NTP_Version = ($C_Byte1 & 56) >> 3;
$C_Mode = $C_Byte1 & 7;
# if leap indicator not 0 or 3 -> abort
if ($self->{strict_checks} && ($C_Leap_Indicator != 0 && $C_Leap_Indicator != 3)) {
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (wrong leap indicator value)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# according to the rfc, ntp version must be taken from client packet, therefore it should be between 1 and 4
if ($C_NTP_Version >= 1 && $C_NTP_Version <= 4) {
$S_NTP_Version = $C_NTP_Version;
}
else {
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (wrong ntp version)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# mode must be 4 (server), if client mode was 3 (client), else 2 (symmetric passive)
if ($C_Mode == 3) {
$S_Mode = 4;
}
elsif ($C_Mode == 1 || $C_Mode == 2) {
$S_Mode = 2;
}
else {
# if mode is not between 1 and 3 -> abort
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (wrong client mode)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# stratum should be 0 (unspecified)
if ($self->{strict_checks} && ($C_Stratum != 0)) {
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (wrong stratum)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
# poll is taken from client and should be in range 1-14
if ($C_Poll) {
# set to 1..17 as temp. workaround ==> ToDo
if ($C_Poll >= 1 && $C_Poll <= 17) {
$S_Poll = $C_Poll;
}
else {
# poll not in range and not 0 -> abort
&INetSim::Log::SubLog("[$rhost:$rport] recv: invalid ntp packet (poll interval out of range)", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
return;
}
}
else {
# else set poll to 6 (64s)
$S_Poll = 6;
}
$S_Root_Delay_w2 = &frac2bin($S_Root_Delay_w1);
$S_Root_Dispersion_w2 = &frac2bin($S_Root_Dispersion_w1);
$cur_time = &INetSim::FakeTime::get_faketime();
# last sync time for server clock
$S_Reference_Time_w1 = $cur_time + NTP_ADJ - 59;
##### fraction to ^^^
$S_Reference_Time_w2 = &frac2bin($S_Reference_Time_w1);
#### RFC-konform ??? ToDo !!!!!!!
#
#if ($S_NTP_Version == 4 && $S_Stratum >= 2){
# $S_Reference_Clock_Identifier = $S_Reference_Time_w2 >> 33;
#}
#
# Reference Identifier:
# ... In NTP Version 3 secondary servers, this is the 32-bit IPv4
# address of the reference source. In NTP Version 4 secondary servers,
# this is the low order 32 bits of the latest transmit timestamp of the
# reference source.... (rfc 2030, page 10)
#
# ^^^^^^^^^^^
####
# hmm, could be another check built in here !?
if ($C_Transmit_Time_w1) { # check transmit timestamp from client
$S_Originate_Time_w1 = $C_Transmit_Time_w1; # last packet from other connection endpoint. Servers have to take the transmit timestamp from client
$S_Originate_Time_w2 = $C_Transmit_Time_w2; # fraction to transmit timestamp
}
else {
$S_Originate_Time_w1 = 0;
$S_Originate_Time_w2 = &frac2bin($S_Originate_Time_w1);
}
$S_Receive_Time_w1 = $ReceiveTime + NTP_ADJ; # arrival time of the last packet
$S_Receive_Time_w2 = &frac2bin($S_Receive_Time_w1); # fraction to ^^^
$S_Transmit_Time_w1 = $cur_time + NTP_ADJ; # packet sending time
$S_Transmit_Time_w2 = &frac2bin($S_Transmit_Time_w1); # fraction to ^^^
# build byte 1
$S_Leap_Indicator = ($S_Leap_Indicator << 6) ^ 63; # bits 0+1, => SHL 6, XOR with 00111111
$S_NTP_Version = ($S_NTP_Version << 3) ^ 199; # bits 2+3+4 => SHL 3, XOR with 11000111
$S_Mode = $S_Mode ^ 248; # bits 5+6+7 => XOR with 11111000
$S_Byte1 = ($S_Leap_Indicator & $S_NTP_Version & $S_Mode); # put it all together wit AND
# build response packet
$sendmsg = pack ("C3 c n B16 n B16 N N B32 N B32 N B32 N B32",
$S_Byte1,
$S_Stratum,
$S_Poll,
$S_Precision,
$S_Root_Delay_w1,
$S_Root_Delay_w2,
$S_Root_Dispersion_w1,
$S_Root_Dispersion_w2,
$S_Reference_Clock_Identifier,
$S_Reference_Time_w1,
$S_Reference_Time_w2,
$S_Originate_Time_w1,
$S_Originate_Time_w2,
$S_Receive_Time_w1,
$S_Receive_Time_w2,
$S_Transmit_Time_w1,
$S_Transmit_Time_w2
);
# send out as fast as possible
$client->send($sendmsg);
$stat_success = 1;
# analyse and log the client packet
if ($C_Precision) {
$C_Precision = sprintf("%1.4e",2**$C_Precision);
}
else {
$C_Precision = 0;
}
if ($C_Root_Delay_w1 && $C_Root_Delay_w2) {
$C_Root_Delay_w1 += bin2frac($C_Root_Delay_w2);
$C_Root_Delay = sprintf("%.4f", $C_Root_Delay_w1);
}
else {
$C_Root_Delay = 0;
}
if ($C_Root_Dispersion_w1 && $C_Root_Dispersion_w2) {
$C_Root_Dispersion_w1 += bin2frac($C_Root_Dispersion_w2);
$C_Root_Dispersion = sprintf("%.4f", $C_Root_Dispersion_w1);
}
else {
$C_Root_Dispersion = 0;
}
if ($C_Stratum && $C_Reference_Clock_Identifier) {
if ($C_Stratum == 2 && $C_NTP_Version) {
if ($C_NTP_Version >= 1 && $C_NTP_Version <= 3) {
$C_Reference_Clock_Identifier = join(".", unpack("C4", pack("N", $C_Reference_Clock_Identifier)));
}
elsif ($C_NTP_Version == 4) {
$C_Reference_Clock_Identifier = "low 32bits of latest TX timestamp of reference src";
}
}
}
if ($C_Reference_Clock_Identifier) {
# replace non-printable characters with "."
$C_Reference_Clock_Identifier =~ s/([^\x20-\x7e])/\./g;
if (! $C_Reference_Clock_Identifier || $C_Reference_Clock_Identifier =~ /^\x00/){$C_Reference_Clock_Identifier = "unspec"};
}
else{
$C_Reference_Clock_Identifier = "unspec"
}
if ($C_Reference_Time_w1 && $C_Reference_Time_w2) {
$C_Reference_Time_w1 += bin2frac($C_Reference_Time_w2);
$C_Reference_Time = sprintf("%10.5f", $C_Reference_Time_w1 - NTP_ADJ);
}
else {
$C_Reference_Time = sprintf("%10.5f", 0);
}
if ($C_Originate_Time_w1 && $C_Originate_Time_w2) {
$C_Originate_Time_w1 += bin2frac($C_Originate_Time_w2);
$C_Originate_Time = sprintf("%10.5f", $C_Originate_Time_w1 - NTP_ADJ);
}
else {
$C_Originate_Time = sprintf("%10.5f", 0);
}
if ($C_Receive_Time_w1 && $C_Receive_Time_w2) {
$C_Receive_Time_w1 += bin2frac($C_Receive_Time_w2);
$C_Receive_Time = sprintf("%10.5f", $C_Receive_Time_w1 - NTP_ADJ);
}
else {
$C_Receive_Time = sprintf("%10.5f", 0);
}
if ($C_Transmit_Time_w1 && $C_Transmit_Time_w2) {
$C_Transmit_Time_w1 += bin2frac($C_Transmit_Time_w2);
$C_Transmit_Time = sprintf("%10.5f", $C_Transmit_Time_w1 - NTP_ADJ);
}
else {
$C_Transmit_Time = sprintf("%10.5f", 0);
}
&INetSim::Log::SubLog("[$rhost:$rport] recv: VN = $C_NTP_Version, Mode = $C_Mode, LI = $C_Leap_Indicator", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Stratum = $C_Stratum, Poll = $C_Poll, Precision = $C_Precision", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Root Delay = $C_Root_Delay, Root Dispersion = $C_Root_Dispersion", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Reference Identifier = $C_Reference_Clock_Identifier", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Reference Timestamp = $C_Reference_Time", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Originate Timestamp = $C_Originate_Time", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Receive Timestamp = $C_Receive_Time", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] recv: Transmit Timestamp = $C_Transmit_Time", $self->{servicename}, $$);
# log the response packet
$S_Leap_Indicator = $S_Leap_Indicator >> 6;
$S_NTP_Version = ($S_NTP_Version & 56) >> 3;
$S_Mode = $S_Mode & 7;
$S_Precision = sprintf("%1.4e",2**$S_Precision);
$S_Root_Delay_w1 += bin2frac($S_Root_Delay_w2);
$S_Root_Delay = sprintf("%.4f", $S_Root_Delay_w1);
$S_Root_Dispersion_w1 += bin2frac($S_Root_Dispersion_w2);
$S_Root_Dispersion = sprintf("%.4f", $S_Root_Dispersion_w1);
$S_Reference_Time_w1 += bin2frac($S_Reference_Time_w2);
$S_Reference_Time = sprintf("%10.5f",$S_Reference_Time_w1 - NTP_ADJ);
$S_Originate_Time_w1 += bin2frac($S_Originate_Time_w2);
$S_Originate_Time = sprintf("%10.5f",$S_Originate_Time_w1 - NTP_ADJ);
$S_Receive_Time_w1 += bin2frac($S_Receive_Time_w2);
$S_Receive_Time = sprintf("%10.5f",$S_Receive_Time_w1 - NTP_ADJ);
$S_Transmit_Time_w1 += bin2frac($S_Transmit_Time_w2);
$S_Transmit_Time = sprintf("%10.5f",$S_Transmit_Time_w1 - NTP_ADJ);
&INetSim::Log::SubLog("[$rhost:$rport] send: VN = $S_NTP_Version, Mode = $S_Mode, LI = $S_Leap_Indicator", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Stratum = $S_Stratum, Poll = $S_Poll, Precision = $S_Precision", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Root Delay = $S_Root_Delay, Root Dispersion = $S_Root_Dispersion", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Reference Identifier = $S_Reference_Clock_Identifier", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Reference Timestamp = $S_Reference_Time ".scalar(localtime($S_Reference_Time)), $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Originate Timestamp = $S_Originate_Time ".scalar(localtime($S_Originate_Time)), $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Receive Timestamp = $S_Receive_Time ".scalar(localtime($S_Receive_Time)), $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] send: Transmit Timestamp = $S_Transmit_Time ".scalar(localtime($S_Transmit_Time)), $self->{servicename}, $$);
}
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
if ($stat_success == 1) {
$S_Originate_Time = sprintf("%d", $S_Originate_Time);
$S_Transmit_Time = sprintf("%d", $S_Transmit_Time);
if ($S_Originate_Time > $S_Transmit_Time) {
$diff_seconds = $S_Originate_Time - $S_Transmit_Time;
}
elsif ($S_Originate_Time < $S_Transmit_Time) {
$diff_seconds = $S_Transmit_Time - $S_Originate_Time;
}
&INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success client=$S_Originate_Time server=$S_Transmit_Time secsdiff=$diff_seconds", $self->{servicename}, $$);
}
else {
&INetSim::Log::SubLog("[$rhost:$rport] stat: $stat_success", $self->{servicename}, $$);
}
}
sub bin2frac {
# convert a binary string to fraction
my $input = shift;
my @bin = split '', $input;
my $frac = 0;
while (@bin) {
$frac = ($frac + pop @bin)/2;
}
$frac;
}
sub frac2bin{
# convert a fraction to binary string (B32)
my $input = shift;
my $frac = $input;
my $bin ="";
while (length($bin) < 32) {
$bin = $bin . int($frac*2);
$frac = $frac*2 - int($frac*2);
}
$bin;
}
1;
#############################################################
#
# History:
#
# Version 0.49 (2013-08-28) me
# - changed allowed poll range to 1..17 as temp. workaround
#
# Version 0.48 (2009-10-28) me
# - improved some code parts
#
# Version 0.47 (2009-09-01) me
# - changed comments
#
# Version 0.46 (2008-08-27) me
# - added logging of process id
#
# Version 0.45 (2008-03-15) me
# - added configuration option 'NTP_StrictChecks' to enable/disable
# strict packet checks
# - changed check for non-printable characters in $C_Reference_Clock_Identifier
# variable
#
# Version 0.44 (2008-03-15) me
# - removed check for given reference timestamp from client,
# because some operating systems sets this to a non-zero value
# - changed logging messages for invalid packets
#
# Version 0.43 (2007-12-31) th
# - change process name
#
# Version 0.42 (2007-04-29) me
# - added some checks for valid packets
# - added logging of every invalid packet
#
# Version 0.41 (2007-04-26) th
# - use getConfigParameter
#
# Version 0.40 (2007-04-21) me
# - added logging of status for use with &INetSim::Report::GenReport()
#
# Version 0.39 (2007-04-20) me
# - fixed a ugly bug with byte 1
# - added check for byte 1
# - added flag for invalid packets
#
#
# Version 0.38 (2007-04-10) th
# - get fake time via &INetSim::FakeTime::get_faketime()
# instead of accessing $INetSim::Config::FakeTimeDelta
#
# Version 0.37 (2007-04-05) me
# - changed check for MaxChilds, BindAddress, RunAsUser and
# RunAsGroup
#
# Version 0.36b-c (2007-03-30) me
# - forgotten debug output removed *argh*
# - fixed a typo
#
# Version 0.36 (2007-03-30) me
# - small bug fixes with variables
#
# Version 0.35 (2007-03-29) me
# - complete rewrite :-/
# - now checking some ranges from client packet
# - ToDo: the if-condition at lines 189-191
#
# Version 0.34 (2007-03-27) th
# - fixed logging if *_Time_H undefined
# - $S_Precision is negative, therefore cannot be pack'ed as
# "C", so "C3" changed to "C2 c" when generating $send_msg
#
# Version 0.33 (2007-03-18) th
# - added configuration option $INetSim::Config::NTP_Server_IP
# - fixed double declaration of $S_Mode
#
# Version 0.32 (2007-03-16) th
# - added configuration option $INetSim::Config::FakeTimeDelta
#
# Version 0.31 (2007-03-15) th
# - small bug fixes with variables
#
# Version 0.3 (2007-03-14) me
#
#############################################################
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