/usr/share/sendmail/cf/feature/domainmap.m4 is in sendmail-cf 8.15.2-10.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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FEATURE(domainmap) Macro
The existing virtusertable feature distributed with sendmail is a good
basic approach to virtual hosting, but it is missing a few key
features:
1. Ability to have a different map for each domain.
2. Ability to perform virtual hosting for domains which are not in $=w.
3. Ability to use a centralized network-accessible database (such as
PH) which is keyed on username alone (as opposed to the
fully-qualified email address).
The FEATURE(domainmap) macro neatly solves these problems.
The basic syntax of the macro is:
FEATURE(domainmap, `domain.com', `map definition ...')dnl
To illustrate how it works, here is an example:
FEATURE(domainmap, `foo.com', `dbm -o /etc/mail/foo-users')dnl
In this example, mail sent to user@foo.com will be rewritten by the
domainmap. The username will be looked up in the DBM map
/etc/mail/foo-users, which looks like this:
jsmith johnsmith@mailbox.foo.com
jdoe janedoe@sandbox.bar.com
So mail sent to jsmith@foo.com will be relayed to
johnsmith@mailbox.foo.com, and mail sent to jdoe@foo.com will be
relayed to janedoe@sandbox.bar.com.
The FEATURE(domainmap) Macro supports the user+detail syntax by
stripping off the +detail portion before the domainmap lookup and
tacking it back on to the result. Using the example above, mail sent
to jsmith+sometext@foo.com will be rewritten as
johnsmith+sometext@mailbox.foo.com.
If one of the elements in the $=w class (i.e., "local" delivery hosts)
is a domain specified in a FEATURE(domainmap) entry, you need to use
the LOCAL_USER(username) macro to specify the list of users for whom
domainmap lookups should not be done.
To use this macro, simply copy this file into the cf/feature directory
in the sendmail source tree. For more information, please see the
following URL:
http://www-dev.cites.uiuc.edu/sendmail/domainmap/
Feedback is welcome.
Mark D. Roth <roth@uiuc.edu>
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>>changequote(`, ')undivert(-1)divert
ifdef(`_DOMAIN_MAP_',`',`dnl
LOCAL_RULE_0
# do mapping for domains where applicable
R$* $=O $* <@ $={MappedDomain} .> $@ $>Recurse $1 $2 $3 Strip extraneous routing
R$+ <@ $={MappedDomain} .> $>DomainMapLookup $1 <@ $2 .> domain mapping
LOCAL_RULESETS
###########################################################################
### Ruleset DomainMapLookup -- special rewriting for mapped domains ###
###########################################################################
SDomainMapLookup
R $=L <@ $=w .> $@ $1 <@ $2 .> weed out local users, in case
# Cw contains a mapped domain
R $+ <@ $+> $: $1 <@ $2 > <$&{addr_type}> check if sender
R $+ <@ $+> <e s> $#smtp $@ $2 $: $1 @ $2 do not process sender
ifdef(`DOMAINMAP_NO_REGEX',`dnl
R $+ <@ $+> <$*> $: $1 <@ $2> <$2> find domain
R $+ <$+> <$+ . $+> $1 <$2> < $(dequote $3 "_" $4 $) >
# change "." to "_"
R $+ <$+> <$+ .> $: $1 <$2> < $(dequote "domain_" $3 $) >
# prepend "domain_"
dnl',`dnl
R $+ <@ $+> <$*> $: $1 <@ $2> <$2 :NOTDONE:> find domain
R $+ <$+> <$+ . :NOTDONE:> $1 <$2> < $(domainmap_regex $3 $: $3 $) >
# change "." and "-" to "_"
R $+ <$+> <$+> $: $1 <$2> < $(dequote "domain_" $3 $) >
# prepend "domain_"
dnl')
R $+ <$+> <$+> $: $1 <$2> <$3> $1 find user name
R $+ <$+> <$+> $+ + $* $: $1 <$2> <$3> $4 handle user+detail syntax
R $+ <$+> <$+> $+ $: $1 <$2> $( $3 $4 $: <ERROR> $)
# do actual domain map lookup
R $+ <$+> <ERROR> $#error $@ 5.1.1 $: "550 email address lookup in domain map failed"
R $+ <@ $+> $* <TEMP> $* $#dsmtp $@ localhost $: $1 @ $2
# queue it up for later delivery
R $+ + $* <$+> $+ @ $+ $: $1 + $2 <$3> $4 + $2 @ $5
# reset original user+detail
R $+ <$+> $+ $@ $>Recurse $3 recanonify
ifdef(`DOMAINMAP_NO_REGEX',`',`dnl
LOCAL_CONFIG
K domainmap_regex regex -a.:NOTDONE: -s1,2 -d_ (.*)[-\.]([^-\.]*)$
')define(`_DOMAIN_MAP_',`1')')
LOCAL_CONFIG
C{MappedDomain} _ARG_
K `domain_'translit(_ARG_, `.-', `__') _ARG2_ -T<TEMP>
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