Add support for NTP authentication

[Brandon Enochs]

Sorry for the delay response, the patch works; however, it segfaults if the
input to -p is malformed.  For example, "busybox ntpd -k /etc/ntp/keys -p
keyno:192.168.1.1 -d -n -q".  Also, it seems like the book keeping for
determine whether a key is used or not and free unused entries isn't worth
it.  Typically, you'll only have a single key entry.

On Fri, Oct 26, 2018 at 5:10 PM Denys Vlasenko <vda.linux at googlemail.com>
wrote:

> On Fri, Oct 26, 2018 at 7:01 PM Denys Vlasenko <vda.linux at googlemail.com>
> wrote:
> > On Tue, Oct 16, 2018 at 9:49 PM Brandon Enochs <enochs.brandon at gmail.com>
> wrote:
> > >  //usage:     "\n    -p PEER    Obtain time from PEER (may be
> repeated)"
> > > +//usage:     "\n    -K    key number for preceding PEER (may be
> repeated)"
> > > +//usage:     "\n    -k    key file (see man 5 ntp.keys)"
> >
> > The interplay between -p and -K is rather hard to code.
> >
> > Since -p is busybox's invention anyway, there is no compatibility
> > to support, and we can, say, just include keys into -p ARG.
> > Then we don't need -K.
> >
> > Brainstorming. How about -p [ALGO:KEYNO:]PEER ?
> >
> > Also, code which parses of "server" lines in /etc/ntp.conf
> > probably needs to be extended to understand "key KEYNO" arg?
>
> Here's the code attached. Can you try it?
>
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