Need help with xmpp-echo-bot?
Click the “chat” button below for chat support from the developer who created it, or find similar developers for support.

About the developer

horazont
128 Stars 12 Forks 25 Commits 3 Opened issues

Description

XMPP/Jabber echo bot (written in sed)

Services available

!
?

Need anything else?

Contributors list

XMPP Echo Bot

Do you know that situation, you really really need an XMPP echo bot, but you don’t have access to high-level tools like

Python 
_ to write one? All you have is
openssl
,
bash
,
dig
,
stdbuf
and
sed
? Then this tool is for you.

This is an XMPP echo bot written in (mostly) sed. Bash is used to do the pre-authentication setup (look up DNS records, establish TLS via

openssl s_client
). sed processes the XML stream and handles all interaction with the server on the XMPP level. Yes, this kinda parses XML in sed.

Tested to work against Prosody 0.9.

Usage

::

./echoz.sh [email protected] password

Supported Features

  • Off-the-Record messaging
  • XEP-0092 (Software Version) 
    _
  • XEP-0199 (XMPP Ping) 
    _

Testimonials

  • This is crazy, I haven't crashed it yet!
    Matthew Wild 
    _
  • I'm frightened. It's only two steps away from gaining consciousness.
    Georg Lukas 
    _
  • I am simultaneously appalled and in awe. wow
    Lance 
    _
  • With Echoz.sed, we were able to reduce our XMPP Echo server costs by 90% compared to our previous TeX-based solution. — Leon
  • While simple and limited, sed is sufficiently powerful for a large number of purposes.
    Wikipedia 
    _
  • oh my god this actually works
    Test 
    _

Implementation Details

  • We use
    tr
    to convert
    >
    to
    \n
    -- since sed is line (or NUL) based, there’s not really another way to parse XMPP XML (which generally never contains newlines) with sed.
  • TLS is handled outside of sed for similar reasons. And to keep my sanity (some people might question whether I still have any bit of sanity left).
  • Likewise, SRV lookup and composition of the authentication data is entirely handled in bash. This also means that only PLAIN SASL authentication is supported -- SCRAM requires a level of interactivity which would be extremely hard to achieve in sed (not impossible though; we would "just" have to implement base64 and sha1-hmac in sed).
  • Since XMPP is a protocol where the client speaks first, we need to hand sed some initial input to allow it to generate a "line" of output (the stream header). We do that with bash, and use that opportunity to pass some configuration to the sed program (namely JID and authentication string).

Design Considerations

  • We considered using
    xml2
    to convert the XML stream into events; however, it turns out that
    2xm[
    doesn’t like stream resets. Also, using the
    tr
    approach also allows us to detect the end of elements, which is useful for various purposes.

We use cookies. If you continue to browse the site, you agree to the use of cookies. For more information on our use of cookies please see our Privacy Policy.