[Bug 234237] ipfw cannot parse port names with hyphens or underscores

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234237

            Bug ID: 234237
           Summary: ipfw cannot parse port names with hyphens or
                    underscores
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: jlduran at gmail.com

ipfw is not able to parse port names that contain hyphens or underscores:

    $ ipfw -n add pass udp from any to any dst-port ftp-data
    ipfw: invalid destination port ftp-data

    $ ipfw -n add pass udp from any to any dst-port rsvp_tunnel
    ipfw: invalid destination port rsvp_tunnel

Without the hyphen, it works as expected:

    $ ipfw -n add pass udp from any to any dst-port ftp
    00000 allow udp from any to any 21

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