[Bug 263358] hostapd rc script defines function hostapd_poststart() before $ifn

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 18 Apr 2022 06:45:19 UTC

--- Comment #2 from Joshua Kinard <freebsd@kumba.dev> ---
(In reply to Andriy Gapon from comment #1)

Prior to this //recent// change, I did not have to specify an interface to the
rc script.  'service hostapd restart' worked as expected, as it has been for
the past two years, because the interface was specified in hostapd's config
file.  The interface being required in this instance is so it can be passed to
ifconfig, NOT to hostapd.  This isn't a usage error, this is an improper
overloading of the rc script's functionality, if anything.

As far as bourne shell functions go, unless a variable is explicitly passed to
it, it will pull it from global scope.  But because the function is defined
before $ifn, it gets a blank value.  This means when substitution occurs, you
get "ifconfig  down" followed by "ifconfig  up" (note the two spaces).

The commit that added this change references a similar commit to
wpa_supplicant, 5fcdc19a8111, and if you look at that rc script, the equivalent
poststart function is defined AFTER $ifn is defined, so it will pickup an
interface passed to the rc script.  wpa_supplicant's rc script also includes an
explicit check for $ifn being defined, and if not, returns 1 for an error.  The
hostapd rc script does not have such a check, thus it is logical to assume that
the interface argument is optional, NOT required.  If this assumption is wrong,
then that is itself a second bug, because the author of the change forgot to
enforce the passing of an interface in a similar manner to what
wpa_supplicant's rc script is doing.

This is a bug :)

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