Re: Example of smtpd-filters
On 2023/10/20 21:52:41 +0200, Sagar Acharya wrote: > I'm simply unable to start. > > I have to know where to get the mail from, format of text, which process to > give the return to, in what format, i.e. are there any standard return values > for accept or reject mail. I'd like to stress the point that a key difference of OpenSMTPD' filters is that they DO NOT EXIT. A filter is just a program (or a script) that is executed by smtpd at start and never exits. If a filter quits, it's a non-recoverable failure and smtpd dies too. The filter and smtpd talk via a simple protocol: smtpd writes lines to the filter standard input and the filter writes its responses to the standard output. Tassilo already shared some very sample code to get you started, for the rest you can refer to smtpd-filters[0] which describes the protocol. Feel free (of course!) to ask for clarification for any aspect not clearly covered in the manual page. Thanks, Omar Polo [0]: https://man.openbsd.org/smtpd-filters.7
Re: Example of smtpd-filters
You basically write a script that processes incoming lines on stdin, and
writes back to stdout. The protocol is described in smtpd-filters(7).
This basic idea in lua would be something like:
for line in io.lines() do
if line == 'in' then
io.write('out')
end
end
Now handle the lines you want to handle, and respond to them how it's
described in smtpd-filters(7).
On Fri, Oct 20, 2023 at 09:52:41PM +0200, Sagar Acharya wrote:
I'm simply unable to start.
I have to know where to get the mail from, format of text, which
process to give the return to, in what format, i.e. are there any
standard return values for accept or reject mail.
Thanking you
Sagar Acharya
https://humaaraartha.in/selfdost/selfdost.html
20 Oct 2023, 23:47 by tphil...@potion-studios.com:
Post your script that you got so far, explain where you get stuck/confused, and
someone will probably be happy to help.
On Fri, Oct 20, 2023 at 02:05:13PM +0200, Sagar Acharya wrote:
Can you please help me with a sample script for accepting or rejecting mail in
lua.
Say there is myfilter.lua within /etc/smtpd/
Can one please help with a sample whose pseudocode goes like
fetch(mail)if mailbody contains foo, reject,
else if mailbody contains bar, accept.
Such a sample script would help very much to support users write their own custom filters. Thanking you
Sagar Acharya
https://humaaraartha.in/selfdost/selfdost.html
Re: Example of smtpd-filters
I'm simply unable to start. I have to know where to get the mail from, format of text, which process to give the return to, in what format, i.e. are there any standard return values for accept or reject mail. Thanking you Sagar Acharya https://humaaraartha.in/selfdost/selfdost.html 20 Oct 2023, 23:47 by tphil...@potion-studios.com: > Post your script that you got so far, explain where you get stuck/confused, > and someone will probably be happy to help. > > > On Fri, Oct 20, 2023 at 02:05:13PM +0200, Sagar Acharya wrote: > >> Can you please help me with a sample script for accepting or rejecting mail >> in lua. >> >> Say there is myfilter.lua within /etc/smtpd/ >> >> Can one please help with a sample whose pseudocode goes like >> >> fetch(mail)if mailbody contains foo, reject, >> else if mailbody contains bar, accept. >> >> Such a sample script would help very much to support users write their own >> custom filters. Thanking you >> Sagar Acharya >> https://humaaraartha.in/selfdost/selfdost.html >>
Re: Example of smtpd-filters
Post your script that you got so far, explain where you get stuck/confused, and someone will probably be happy to help. On Fri, Oct 20, 2023 at 02:05:13PM +0200, Sagar Acharya wrote: Can you please help me with a sample script for accepting or rejecting mail in lua. Say there is myfilter.lua within /etc/smtpd/ Can one please help with a sample whose pseudocode goes like fetch(mail)if mailbody contains foo, reject, else if mailbody contains bar, accept. Such a sample script would help very much to support users write their own custom filters. Thanking you Sagar Acharya https://humaaraartha.in/selfdost/selfdost.html
