This is untested, but I've done something like the following:

unless (@ARGV) {
    open CONF, "ciscoconf" or die "We're really in trouble now: $!";
    while (<CONF>) {
        chomp;
        push @ARGV, $_;
    }
    close CONF;
}
[download]

Then you can just loop through @ARGV as you feel the need.

Granted, I was expecting a list of files to READ, and I wanted to use the magic <> construct, but something similar applies.