Package: maildrop Version: 2.7.1-3 Severity: normal Tags: upstream Dear Maintainer,
*** Reporter, please consider answering these questions, where appropriate ***
* What led up to the situation?
* What exactly did you do (or not do) that was effective (or
ineffective)?
* What was the outcome of this action?
the mailfilter manpage states that subpatterns are not processed in foreach
statements (both in "Pattern Match Results" and in the documentation if
"foreach"). The documentation of "getaddr" has a nice example making use of
this:
======================================================================
ADDRLIST=""
foreach /^(To|Cc): .*/
{
foreach (getaddr $MATCH) =~ /.+/
{
ADDRLIST="$ADDRLIST $MATCH"
}
}
======================================================================
However, expanding that example to a complete test case reveals that the body
of foreach is indeed called twice for each matches header; once with MATCH set
to the complete header, and once with MATCH set to the text matched by the
subpattern.
======================================================================
#!/bin/sh
MAILFILTER=
trap 'rm -f "$MAILFILTER"' 0
MAILFILTER=$(mktemp)
cat >"$MAILFILTER" <<\EOF
foreach /^(To|Cc): .*/
{
echo "outer match=$MATCH"
foreach (getaddr $MATCH) =~ /.+/
{
echo "inner match=$MATCH"
}
}
to "/dev/null"
EOF
maildrop "$MAILFILTER" <<EOF
To: o...@to.org, t...@to.org
Cc: o...@cc.org, t...@cc.org
EOF
======================================================================
This will result in the following output:
======================================================================
outer match=To: o...@to.org, t...@to.org
inner match=o...@to.org
inner match=t...@to.org
outer match=To
inner match=To
outer match=Cc: o...@cc.org, t...@cc.org
inner match=o...@cc.org
inner match=t...@cc.org
outer match=Cc
inner match=Cc
======================================================================
* What outcome did you expect instead?
Based on the documentation, I'd expect the body of the outer foreach to be
called only once for each matched header, with MATCH set to the complete
header.
I'd also expect MATCH1 to be unmodified inside the outer foreach body.
However, a slight modification of the of the above script reveals that MATCH1
is set to "Cc" the first time the outer foreach body is executed (but not on
subsequent executions).
Regards,
Jö.
-- System Information:
Debian Release: 8.0
APT prefers stable
APT policy: (990, 'stable'), (1, 'proposed-updates'), (1, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)
Versions of packages maildrop depends on:
ii courier-authlib 0.66.1-1+b1
ii libc6 2.19-18
ii libgcc1 1:4.9.2-10
ii libgdbm3 1.8.3-13.1
ii libpcre3 2:8.35-3.3
ii libstdc++6 4.9.2-10
Versions of packages maildrop recommends:
ii exim4 4.84-8
ii exim4-daemon-light [mail-transport-agent] 4.84-8
maildrop suggests no packages.
-- no debconf information
--
Jorrit (Jö) Fahlke, Institute for Computational und Applied Mathematics,
University of Münster, Orleans-Ring 10, D-48149 Münster
Tel: +49 251 83 35146 Fax: +49 251 83 32729
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