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scripts/lcp_rtt_dump: dump the LCP RTT log
Signed-off-by: Marco d'Itri <[email protected]>
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#!/usr/bin/perl | ||
# vim: shiftwidth=4 tabstop=4 | ||
# | ||
# This program dumps to standard output the content of the file written | ||
# by pppd's lcp-rtt-file configuration option. | ||
# | ||
# Copyright (C) Marco d'Itri <[email protected]> | ||
# | ||
# This program is free software; you can redistribute it and/or modify | ||
# it under the terms of the GNU General Public License as published by | ||
# the Free Software Foundation; either version 2 of the License, or | ||
# (at your option) any later version. | ||
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use v5.14; | ||
use warnings; | ||
use autodie; | ||
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use POSIX qw(strftime); | ||
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{ | ||
my $data = read_data($ARGV[0] || '/run/ppp-rtt.data'); | ||
die "The data file is invalid!\n" if not $data; | ||
dump_data($data); | ||
} | ||
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sub dump_data { | ||
my ($s) = @_; | ||
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say "status: $s->{status}"; | ||
say "interval: $s->{echo_interval}"; | ||
say "position: $s->{position}"; | ||
say 'elements: ' . scalar(@{ $s->{data} }); | ||
say ''; | ||
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foreach (my $i= 0; $i < @{ $s->{data} }; $i++) { | ||
my $date = strftime('%F %T', localtime($s->{data}->[$i]->[0])); | ||
print "$i\t$date\t$s->{data}->[$i]->[1]\t$s->{data}->[$i]->[2]\n"; | ||
} | ||
} | ||
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sub read_data { | ||
my ($file) = @_; | ||
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my $data; | ||
open(my $fh, '<', $file); | ||
binmode($fh); | ||
my $bytes_read; | ||
do { | ||
$bytes_read = sysread($fh, $data, 8192, length($data)); | ||
} while ($bytes_read == 8192); | ||
close($fh); | ||
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my ($magic, $status, $position, $echo_interval, $rest) | ||
= unpack('NNNN a*', $data); | ||
return undef if $magic != 0x19450425; | ||
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# the position is relative to the C array, not to the logical entries | ||
$position /= 2; | ||
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my @rawdata = unpack('(N C a3)*', $rest); | ||
my @data; | ||
while (my ($time, $loss, $rtt) = splice(@rawdata, 0, 3)) { | ||
push(@data, [ $time, unpack('N', "\000$rtt"), $loss ]); | ||
} | ||
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if (0) { | ||
# rearrange the list in chronological order | ||
if ($position == $#data) { | ||
@data = @data[1 .. $#data]; | ||
} elsif ($position == 0) { | ||
@data = @data[0 .. $#data-1]; | ||
} else { | ||
@data = (@data[$position+2 .. $#data], @data[0 .. $position]); | ||
} | ||
@data = grep { $_->[0] } @data; | ||
} | ||
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return { | ||
status => $status, | ||
echo_interval => $echo_interval, | ||
position => $position, | ||
data => \@data, | ||
}; | ||
} | ||
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