/usr/bin/socket_getnameinfo is in libsocket-getaddrinfo-perl 0.22-3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 | #!/usr/bin/perl
eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
if 0; # not running under some shell
use strict;
use warnings;
use Getopt::Long;
use Socket::GetAddrInfo qw(
getaddrinfo getnameinfo
AI_NUMERICHOST AI_NUMERICSERV
NI_DGRAM
);
sub usage
{
my ( $exitcode ) = @_;
my $basename = $0;
$basename =~ m{/([^/]+?)$} and $basename = $1;
print STDERR <<"EOF";
Performs a getnameinfo(3) lookup and prints the returned names
Usage:
$basename [ADDRESS] [PORT] [options...]
Options:
--address, -A ADDRESS Address to look up
--port, -P PORT Port number to look up
--dgram Set the NI_DGRAM flag; looks up a SOCK_DGRAM (udp)
rather than SOCK_STREAM (tcp) port
--help Display this help and exit
EOF
exit $exitcode;
}
my $addr;
my $port;
my $flags = 0;
GetOptions(
'address|A=s' => \$addr,
'port|P=i' => \$port,
'dgram' => sub { $flags |= NI_DGRAM },
'help|h' => sub { usage( 0 ) },
) or usage( 1 );
$addr = shift @ARGV if @ARGV and !defined $addr;
$port = shift @ARGV if @ARGV and !defined $port;
defined $addr or defined $port or
usage( 1 );
# Need this in an address form first; we'll have to getaddrinfo() it
my ( $err, $sockaddr ) = getaddrinfo( $addr, $port, { flags => AI_NUMERICHOST|AI_NUMERICSERV } );
die "Unrecognised address or port format - $err\n" if $err;
( $err, my $host, my $service ) = getnameinfo( $sockaddr->{addr}, $flags );
die "Unable to resolve address - $err\n" if $err;
if( defined $addr and defined $port ) {
print "Resolved address '$addr', port '$port'\n";
print "\n";
print " $host $service\n";
}
elsif( defined $addr ) {
print "Resolved address '$addr'\n";
print "\n";
print " $host\n";
}
elsif( defined $port ) {
print "Resolved port '$port'\n";
print "\n";
print " $service\n";
}
__END__
=head1 NAME
C<socket_getnameinfo> - command-line tool to C<getnameinfo(3)> resolver
=head1 SYNOPSIS
B<socket_getnameinfo> [I<options...>] I<address> I<port>
=head1 DESCRIPTION
This tool provides a convenient command-line wrapper around the
C<getnameinfo(3)> resolver function. It will perform a single reverse lookup
to convert an address and port number into its host and service names. This is
mainly useful when debugging names resolution problems, because it allows
inspection of the C<getnameinfo(3)> behaviour itself, outside of any real
program that is trying to use it.
=head1 OPTIONS
=over 8
=item --address, -A ADDR
Numerical form of address to look up. If not supplied, will use the first
positional argument.
=item --port, -P PORT
Port number to look up. If not supplied, will use the second positional
argument.
=item --dgram
Sets the C<NI_DGRAM> flag; looks up a C<SOCK_DGRAM> (udp) port allocation
rather than C<SOCK_STREAM> (tcp).
=item --help
Display a help summary and exit
=back
=head1 NOTE
Upstream this script is known as C<getnameinfo>, but was renamed on Debian.
=head1 AUTHOR
Paul Evans <leonerd@leonerd.org.uk>
|