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use strict;
use Socket;
$ENV{'LANG'} = $ENV{'LANGUAGE'} = $ENV{'LC_MESSAGES'} = 'C';
=pod
=head1 NAME
Utils - Utility functions for testing C<Net::Pcap>
=head1 FUNCTIONS
=over 4
=item B<is_available()>
Returns true if the given function name is available in the version of
the pcap library the module is being built against.
=cut
my %available_func = ();
FUNCS: {
open(FUNCS, 'funcs.txt') or warn "can't read 'funcs.txt': $!\n" and next;
while(my $line = <FUNCS>) { chomp $line; $available_func{$line} = 1; }
close(FUNCS);
}
sub is_available {
return $available_func{$_[0]}
}
=item B<is_allowed_to_use_pcap()>
Returns true if the user running the test is allowed to use the packet
capture library. On Unix systems, this function tries to open a raw socket.
On Win32 systems (ActivePerl, Cygwin), it just checks whether the user
has administrative privileges.
=cut
sub is_allowed_to_use_pcap {
# Win32: ActivePerl, Cygwin
if ($^O eq 'MSWin32' or $^O eq 'cygwin') {
my $is_admin = 0;
eval 'no warnings; use Win32; $is_admin = Win32::IsAdminUser()';
$is_admin = 1 if $@; # Win32::IsAdminUser() not available
return $is_admin
}
# Unix systems
else {
if(socket(S, PF_INET, SOCK_RAW, getprotobyname('icmp'))) {
close(S);
return 1
}
else {
return 0
}
}
}
=item B<find_network_device()>
Returns the name of a device suitable for listening to network traffic.
=cut
my $err;
my %devs = ();
my @devs = Net::Pcap::findalldevs(\%devs, \$err);
# filter out unusable devices
@devs = grep { $_ ne "lo" and $_ ne "lo0" and $_ !~ /GenericDialupAdapter/ } @devs;
# check if the user has specified a prefered device to use for tests
if (open(PREF, "device.txt")) {
my $dev = <PREF>;
chomp $dev;
unshift @devs, $dev;
}
sub find_network_device {
return wantarray ? @devs : $devs[0]
}
=back
=cut
1
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