It's of course not a production code. I'm only trying to
learn and understand how exactly it works.
I cannot find anything about "--" in the postfix documentation
(or I'm looking on the wrong page?). There is any explanation
somewhere? (instead of at the source code).
Thanks for your help!
2016-10-14 1:07 GMT+01:00 Wietse Venema <wie...@porcupine.org>:
> Pawe? Grzesik:
> > I think I can do the same in Ruby using IO.popen like:
> >
> > IO.popen(["/usr/sbin/sendmail", "-G", "-i", my_str], "w") do |pipe|
> >
> > as I see in this case I don't even need to use my_str with \" \".
> >
> > But I'm still confused about -f option in master.cf, and characters "--"
> > between ${sender} and ${recipient}.
> > Why is that?
>
> Specify
>
> popen(["/usr/sbin/sendmail", "-G", "-i", "-f", sender, "--", my_str, "w")
>
> The -- is needed to close a different security hole.
>
> If you don't know about these bugs that go back to 1996 and earlier,
> then please don't write code that handles network data.
>
> Wietse
>
