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Merge pull request #422 from rfc1036/lcp-rtt
Implement logging the LCP Round Trip Time
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| #!/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. | ||
|
|
||
| use v5.14; | ||
| use warnings; | ||
| use autodie; | ||
|
|
||
| use POSIX qw(strftime); | ||
|
|
||
| { | ||
| my $data = read_data($ARGV[0] || '/run/ppp-rtt.data'); | ||
| die "The data file is invalid!\n" if not $data; | ||
| dump_data($data); | ||
| } | ||
|
|
||
| sub dump_data { | ||
| my ($s) = @_; | ||
|
|
||
| say "status: $s->{status}"; | ||
| say "interval: $s->{echo_interval}"; | ||
| say "position: $s->{position}"; | ||
| say 'elements: ' . scalar(@{ $s->{data} }); | ||
| say ''; | ||
|
|
||
| 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}->[$i]->[2]\n"; | ||
| } | ||
| } | ||
|
|
||
| sub read_data { | ||
| my ($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); | ||
|
|
||
| my ($magic, $status, $position, $echo_interval, $rest) | ||
| = unpack('NNNN a*', $data); | ||
| return undef if $magic != 0x19450425; | ||
|
|
||
| # 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 ]); | ||
| } | ||
|
|
||
| if (0) { | ||
| @data = | ||
| # skip any "empty" (null) entries | ||
| grep { $_->[0] } | ||
| # rearrange the list in chronological order | ||
| (@data[$position+1 .. $#data], @data[0 .. $position]); | ||
| } | ||
|
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||
| return { | ||
| status => $status, | ||
| echo_interval => $echo_interval, | ||
| position => $position, | ||
| data => \@data, | ||
| }; | ||
| } | ||
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