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