91 lines
3.7 KiB
Plaintext
91 lines
3.7 KiB
Plaintext
divert(-1)changequote(<<, >>)<<
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-----------------------------------------------------------------------------
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FEATURE(domainmap) Macro
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The existing virtusertable feature distributed with sendmail is a good
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basic approach to virtual hosting, but it is missing a few key
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features:
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1. Ability to have a different map for each domain.
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2. Ability to perform virtual hosting for domains which are not in $=w.
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3. Ability to use a centralized network-accessible database (such as
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PH) which is keyed on username alone (as opposed to the
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fully-qualified email address).
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The FEATURE(domainmap) macro neatly solves these problems.
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The basic syntax of the macro is:
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FEATURE(domainmap, `domain.com', `map definition ...')dnl
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To illustrate how it works, here is an example:
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FEATURE(domainmap, `foo.com', `dbm -o /etc/mail/foo-users')dnl
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In this example, mail sent to user@foo.com will be rewritten by the
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domainmap. The username will be looked up in the DBM map
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/etc/mail/foo-users, which looks like this:
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jsmith johnsmith@mailbox.foo.com
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jdoe janedoe@sandbox.bar.com
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So mail sent to jsmith@foo.com will be relayed to
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johnsmith@mailbox.foo.com, and mail sent to jdoe@foo.com will be
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relayed to janedoe@sandbox.bar.com.
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The FEATURE(domainmap) Macro supports the user+detail syntax by
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stripping off the +detail portion before the domainmap lookup and
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tacking it back on to the result. Using the example above, mail sent
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to jsmith+sometext@foo.com will be rewritten as
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johnsmith+sometext@mailbox.foo.com.
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If one of the elements in the $=w class (i.e., "local" delivery hosts)
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is a domain specified in a FEATURE(domainmap) entry, you need to use
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the LOCAL_USER(username) macro to specify the list of users for whom
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domainmap lookups should not be done.
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To use this macro, simply copy this file into the cf/feature directory
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in the sendmail source tree. For more information, please see the
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following URL:
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http://www-wsg.cso.uiuc.edu/sendmail/patches/domainmap.html
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Feedback is welcome.
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Mark D. Roth <roth@uiuc.edu>
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-----------------------------------------------------------------------------
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>>changequote(`, ')undivert(-1)divert
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ifdef(`_DOMAIN_MAP_',`',`dnl
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LOCAL_RULE_0
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# do mapping for domains where applicable
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R$* $=O $* <@ $={MappedDomain} .> $@ $>97 $1 $2 $3 Strip extraneous routing
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R$+ <@ $={MappedDomain} .> $>DomainMapLookup $1 <@ $2 .> domain mapping
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LOCAL_RULESETS
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###########################################################################
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### Ruleset DomainMapLookup -- special rewriting for mapped domains ###
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###########################################################################
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SDomainMapLookup
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R $=L <@ $=w .> $@ $1 <@ $2 .> weed out local users, in case
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# Cw contains a mapped domain
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R $+ <@ $+ .> $1 <@ $2 > strip trailing dot
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R $+ <@ $+ . $+ > $1 <@ $(dequote $2 "_" $3 $) >
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# change "." to "_"
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R $+ <@ $+ > $: $1 <@ $(dequote "domain_" $2 $) >
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# prepend "domain_"
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R $+ + $+ <@ $*> $1 <@ $3 > <+> $2 handle user+list syntax
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R $+ <@ $* > $* $( $2 $1 $: <ERROR> $) $3
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# do actual domain map lookup
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R <ERROR> $* $#error $@ 5.1.1 $: "550 email address lookup in domain map failed"
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R $* <TEMP> $* $#error $@ 4.3.0 $: "450 domain map temporarily unavailable"
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R $+ @ $+ <+> $+ $1 + $3 @ $2 reset original user+list
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R $+ <+> $* $1 paranoid check - remove <+>
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R $+ @ $+ . $1 @ $2 strip trailing dot
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R $+ @ $+ $@ $>97 $1 @ $2 recanonify
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define(`_DOMAIN_MAP_',`1')')
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LOCAL_CONFIG
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C{MappedDomain} _ARG_
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K `domain_'translit(_ARG_, `.', `_') _ARG2_ -T<TEMP>
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