Re: Problem with multiple sites and crossposting

Well, I've been playing with SN for a while, now and I got the
loop-prevention script working, so and so.  We'll see if it works
properly.

Anyway, I've included that script here and also a script that rips off
the sender information from the incoming message to provide anonymous
newsgroups.  Anonymization for a newsgroup is done if a file called
.anonymize exists in the newsgroup directory.  This file is meant to
replace the standard POST.  It probably does not do everything a
proper anonymizer should (it filters some of the headings and kills
the signature) do, but it should suffice.

The loop-filtering script bypasses the 'snstore' naming problem by
having a temporary binary directory, where 'snstore' is a link to the
real 'snsend'.  Kludge, but what'cha gonna do...

Feel free to do whatever you want with the scripts (maybe include the
anonymizer script to the next release?) - they are under GPL as usual.

Diffs are given to the 0.3.3 version of POST.

---anonymizing POST---
[news@iso bin]$ diff -c POST POST-anon 
*** POST  Wed Dec  6 09:11:18 2000
--- POST-anon Thu Dec 14 04:57:52 2000
***************
*** 59,64 ****
--- 59,65 ----
  
  postable=
  exists=
+ anonymize=
  
  for ng in $NEWSGROUPS; do
    mentioned=x$mentioned
***************
*** 68,73 ****
--- 69,80 ----
    # .nopost files "belong" to us; we alone control group post access
    [ -f $ng/.nopost ] && continue
    [ "x$postable" = x ] || postable="$postable,"
+ 
+   if [ -f $ng/.anonymize ]
+   then
+     anonymize='true'
+   fi
+ 
    postable="$postable$ng"
  done
  
***************
*** 79,85 ****
    # VERIFIED_SENDER is inherited from the authenticating script that
    # invoked snntpd, if any.
    [ "x$VERIFIED_SENDER" = x ] || echo "Sender: $VERIFIED_SENDER"
!   cat
  } |snsend -v || fail "Unable to post"
  echo "Posted to $postable"
  : Success
--- 86,106 ----
    # VERIFIED_SENDER is inherited from the authenticating script that
    # invoked snntpd, if any.
    [ "x$VERIFIED_SENDER" = x ] || echo "Sender: $VERIFIED_SENDER"
! 
!   if [ $anonymize = 'true' ]
!   then
!      sed -e 's/^From:.*/From: Anonymous coward/' \
!          -e 's/^NNTP-Posting-Host:.*/NNTP-Posting-Host: 127.0.0.1/' \
!          -e 's/^Organization:.*/Organization: Anonymous Newsposters/' \
!          -e 's/^Message-ID: <\([^@]*\)@\([^>]*\)>/Message-ID: <\1@anonymous>/' \
!          -e '/^--/,/^\./{ d; }'
!      echo "--"
!      echo "Anonymized to protect the innocent."
!      echo "."
!   else
!      cat
!   fi
! 
  } |snsend -v || fail "Unable to post"
  echo "Posted to $postable"


--- snstore-fix.sh ---
#!/bin/bash
#
#  This shell script should be invoked instead of snstore.
#  It is smart enough to check if an article has already been here
#  (i.e. removing loops)
#

TMPFILE=/tmp/.sn_filter_$$

cat > ${TMPFILE}

#
#  Check if already been here.
#
if [ `cat ${TMPFILE} | grep -c "Path:.*${HOSTNAME}.*${HOSTNAME}"` != 0 ]
then
    echo "Article already been here - removed"
    trap 'rm -f ${TMPFILE}' 0
    exit 9
fi

#
#  Major kludge to make sure we can run snstore (who checks its
#  own name and won't work unless it's called snstore).
#
export PATH=/usr/local/sn/bin//tmpbin/:${PATH}

#
#  Send to real snstore, adding our own header.
#
{
    echo "X-Filtered-By: snstore-fix on ${HOSTNAME}"
    cat ${TMPFILE}
} | snstore $*

trap 'rm -f ${TMPFILE}' 0


-- 
Janne Jalkanen                          Regex Pty Ltd
[email protected]             Level 11
Tel: +61-438 428 041                    530 Lt Collins St
Fax: +61-3-9909 7510                    Melbourne, VIC 3000