8 die "$us: no arguments permitted\n" if @ARGV;
10 our ($monh,$monchild);
12 # no entry: not reported, does not exist
13 # ry+: reported, entry exists
14 # r: reported, may not still exist (during processing only)
15 # y+: not reported, entry exists
18 return unless $monchild;
20 or warn "$us: cannot kill monitor child [$monchild]: $!\n";
25 END { killmonitor(); }
35 $monchild = open $monh, "-|", qw(ip -o monitor addr)
36 or die "spawn monitor: $!\n";
37 sleep(1) if $restart++;
40 my $got = sysread $monh, $discard, 4096;
41 die "read monitor: $!\n" unless defined $got;
42 die "monitor failed\n" unless $got;
45 #print STDERR "entering", Dumper \%reported;
46 $_='r' foreach values %reported;
47 #print STDERR "cleaned", Dumper \%reported;
48 foreach my $ip (qw(4 6)) {
49 my $addrh = new IO::File;
50 open $addrh, "-|", qw(ip -o), "-$ip", qw(addr show)
51 or die "spawn addr $ip show: $!\n";
52 my $afstr = $ip==4 ? 'inet' : $ip==6 ? 'inet6' : die;
54 if (m{^\d+\:\s*(\S+)\s+$afstr\s+([0-9a-z.:]+)(?:/\d+)?\s}) {
55 my $outline = "$ip $1 $2";
56 $reported{$outline} .= "y";
59 warn "unexpected output from addr $ip show: $_\n";
63 die "addr $ip show failed $!\n" unless $r;
66 #print STDERR "acquired", Dumper \%reported;
67 foreach my $k (keys %reported) {
68 local $_ = $reported{$k};
78 print STDERR "$us: $@";
83 STDOUT->flush or die $!;