106 lines
4.2 KiB
Plaintext
106 lines
4.2 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 $=w class (i.e., "local" delivery hosts)
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is a domain specified in a FEATURE(domainmap) entry, you need to use
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the LOCAL_USER(username) macro to specify the list of users for whom
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domainmap lookups should not be done.
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To use this macro, simply copy this file into the cf/feature directory
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in the sendmail source tree. For more information, please see the
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following URL:
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http://www-dev.cites.uiuc.edu/sendmail/domainmap/
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Feedback is welcome.
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Mark D. Roth <roth@uiuc.edu>
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-----------------------------------------------------------------------------
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>>changequote(`, ')undivert(-1)divert
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ifdef(`_DOMAIN_MAP_',`',`dnl
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LOCAL_RULE_0
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# do mapping for domains where applicable
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R$* $=O $* <@ $={MappedDomain} .> $@ $>Recurse $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 <@ $2 > <$&{addr_type}> check if sender
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R $+ <@ $+> <e s> $#smtp $@ $2 $: $1 @ $2 do not process sender
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ifdef(`DOMAINMAP_NO_REGEX',`dnl
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R $+ <@ $+> <$*> $: $1 <@ $2> <$2> find domain
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R $+ <$+> <$+ . $+> $1 <$2> < $(dequote $3 "_" $4 $) >
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# change "." to "_"
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R $+ <$+> <$+ .> $: $1 <$2> < $(dequote "domain_" $3 $) >
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# prepend "domain_"
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dnl',`dnl
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R $+ <@ $+> <$*> $: $1 <@ $2> <$2 :NOTDONE:> find domain
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R $+ <$+> <$+ . :NOTDONE:> $1 <$2> < $(domainmap_regex $3 $: $3 $) >
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# change "." and "-" to "_"
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R $+ <$+> <$+> $: $1 <$2> < $(dequote "domain_" $3 $) >
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# prepend "domain_"
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dnl')
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R $+ <$+> <$+> $: $1 <$2> <$3> $1 find user name
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R $+ <$+> <$+> $+ + $* $: $1 <$2> <$3> $4 handle user+detail syntax
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R $+ <$+> <$+> $+ $: $1 <$2> $( $3 $4 $: <ERROR> $)
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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> $* $#dsmtp $@ localhost $: $1 @ $2
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# queue it up for later delivery
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R $+ + $* <$+> $+ @ $+ $: $1 + $2 <$3> $4 + $2 @ $5
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# reset original user+detail
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R $+ <$+> $+ $@ $>Recurse $3 recanonify
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ifdef(`DOMAINMAP_NO_REGEX',`',`dnl
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LOCAL_CONFIG
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K domainmap_regex regex -a.:NOTDONE: -s1,2 -d_ (.*)[-\.]([^-\.]*)$
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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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