Date: Sun, 22 Aug 2010 12:40:09 +0200 From: Stefan Bethke <stb@lassitu.de> To: John Nielsen <lists@jnielsen.net> Cc: gshapiro@freebsd.org, FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: Apparent dnsbl bug in Sendmail or m4 Message-ID: <B6617274-729C-42F3-AC70-7FB81B16EEC4@lassitu.de> In-Reply-To: <CD37C0F6-F202-4941-A740-BF17358270A5@lassitu.de> References: <20100822031045.sl4d10544k0s80kw@newwebmail.jnielsen.net> <CD37C0F6-F202-4941-A740-BF17358270A5@lassitu.de>
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Am 22.08.2010 um 10:00 schrieb Stefan Bethke:
> FEATURE(`dnsbl', `bl.spamcop.net', `"550 " $&{client_addr} "foo" $&{client_addr} ""')dnl
The real culprit is the comma. I believe the problem stems from unquoted use of the arguments in some of the ifelses, where the comma turns the single argument into two. Tracing the ifelses with -d aceq I see this for the last ifelse in cf/feature/dnsbl.m4:
m4trace: -1- ifelse(`X"550 Mail from " $&{client_addr} " rejected', `see http://spamcop.net/bl.shtml?" $&{client_addr}', `Xquarantine', `R<?>$+ $#error $@ quarantine $: _DNSBL_SRV_', `X"550 Mail from " $&{client_addr} " rejected', `
see http://spamcop.net/bl.shtml?" $&{client_addr}', `Xdiscard', `R<?>$+
$#discard $: _DNSBL_SRV_', `R<?>$+ $#error $@ 5.7.1 $: _DNSBL_MSG_'
) -> ???
m4trace: -1- ifelse(...) -> `'
m4trace: -1- ifelse ...
I've never managed to really wrap my head around m4 quoting, but the easy fix is to use some other character that has no meaning to m4.
Stefan
--
Stefan Bethke <stb@lassitu.de> Fon +49 151 14070811
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