[exim] How to allow delimiter characters in delimited string…

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Autor: Marc Haber
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A: exim-users
Assumpte: [exim] How to allow delimiter characters in delimited strings?
Hi,

as you might know, the Debian exim4 packages use a file named
/etc/exim4/passwd.client to hold the authentication data used by exim
to authenticate as a client. Its lines are colon-separated:

hostname:username:cleartext-password

so that ${extract{1}{:} can be used to obtain the user name and
${extract{2}{:} yields the cleartext password.

While defining this, we didn't think of user names and passwords
containing colons :-(

Is there any possibility to escape delimiters that might be contained
inside fields in delimited lines? Do you guys have any ideas about how
to allow colons in user names and passwords while preserving backwards
compatibility for existing installations?

Greetings
Marc

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