usr/src/usr.sbin/sendmail/cf/m4/proto.m4

divert(-1)
#
# Copyright (c) 1983, 1995 Eric P. Allman
# Copyright (c) 1988, 1993
#       The Regents of the University of California.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
# 3. All advertising materials mentioning features or use of this software
#    must display the following acknowledgement:
#       This product includes software developed by the University of
#       California, Berkeley and its contributors.
# 4. Neither the name of the University nor the names of its contributors
#    may be used to endorse or promote products derived from this software
#    without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
divert(0)

VERSIONID(`@(#)proto.m4 8.80 (Berkeley) 6/10/95')

MAILER(local)dnl

# level 6 config file format
V6/Berkeley
divert(-1)

# do some sanity checking
ifdef(`__OSTYPE__',,
        `errprint(`*** ERROR: No system type defined (use OSTYPE macro)')')

# pick our default mailers
ifdef(`confSMTP_MAILER',, `define(`confSMTP_MAILER', `smtp')')
ifdef(`confLOCAL_MAILER',, `define(`confLOCAL_MAILER', `local')')
ifdef(`confRELAY_MAILER',,
        `define(`confRELAY_MAILER',
                `ifdef(`_MAILER_smtp_', `relay',
                        `ifdef(`_MAILER_uucp', `suucp', `unknown')')')')
define(`_SMTP_', `confSMTP_MAILER')dnl          for readability only
define(`_LOCAL_', `confLOCAL_MAILER')dnl        for readability only
define(`_RELAY_', `confRELAY_MAILER')dnl        for readability only

# back compatibility with old config files
ifdef(`confDEF_GROUP_ID',
        `errprint(`*** confDEF_GROUP_ID is obsolete.')
         errprint(`    Use confDEF_USER_ID with a colon in the value instead.')')
ifdef(`confREAD_TIMEOUT',
        `errprint(`*** confREAD_TIMEOUT is obsolete.')
         errprint(`    Use individual confTO_<timeout> parameters instead.')')
ifdef(`confMESSAGE_TIMEOUT',
        `define(`_ARG_', index(confMESSAGE_TIMEOUT, /))
         ifelse(_ARG_, -1,
                `define(`confTO_QUEUERETURN', confMESSAGE_TIMEOUT)',
                `define(`confTO_QUEUERETURN',
                        substr(confMESSAGE_TIMEOUT, 0, _ARG_))
                 define(`confTO_QUEUEWARN',
                        substr(confMESSAGE_TIMEOUT, eval(_ARG_+1)))')')
ifdef(`confMIN_FREE_BLOCKS', `ifelse(index(confMIN_FREE_BLOCKS, /), -1,,
        `errprint(`*** compound confMIN_FREE_BLOCKS is obsolete.')
         errprint(`    Use confMAX_MESSAGE_SIZE for the second part of the value.')')')

# clean option definitions below....
define(`_OPTION', `ifdef(`$2', `O $1=$2', `#O $1`'ifelse($3, `',, `=$3')')')dnl

divert(0)dnl

##################
#   local info   #
##################

Cwlocalhost
ifdef(`USE_CW_FILE',
`# file containing names of hosts for which we receive email
Fw`'confCW_FILE',
        `dnl')

# my official domain name
# ... define this only if sendmail cannot automatically determine your domain
ifdef(`confDOMAIN_NAME', `Dj`'confDOMAIN_NAME', `#Dj$w.Foo.COM')

ifdef(`_NULL_CLIENT_ONLY_', `divert(-1)')dnl

CP.

ifdef(`UUCP_RELAY',
`# UUCP relay host
DY`'UUCP_RELAY
CPUUCP

')dnl
ifdef(`BITNET_RELAY',
`#  BITNET relay host
DB`'BITNET_RELAY
CPBITNET

')dnl
ifdef(`DECNET_RELAY',
`define(`_USE_DECNET_SYNTAX_')dnl
# DECnet relay host
DC`'DECNET_RELAY
CPDECNET

')dnl
ifdef(`FAX_RELAY',
`# FAX relay host
DF`'FAX_RELAY
CPFAX

')dnl
# "Smart" relay host (may be null)
DS`'ifdef(`SMART_HOST', SMART_HOST)

ifdef(`LUSER_RELAY',
`# place to which unknown users should be forwarded
Kuser user -m -a<>
DL`'LUSER_RELAY
', `dnl')

# operators that cannot be in local usernames (i.e., network indicators)
CO @ % ifdef(`_NO_UUCP_', `', `!')

# a class with just dot (for identifying canonical names)
C..

ifdef(`MAILER_TABLE',
`# Mailer table (overriding domains)
Kmailertable MAILER_TABLE

')dnl
ifdef(`DOMAIN_TABLE',
`# Domain table (adding domains)
Kdomaintable DOMAIN_TABLE

')dnl
# who I send unqualified names to (null means deliver locally)
DR`'ifdef(`LOCAL_RELAY', LOCAL_RELAY)

# who gets all local email traffic ($R has precedence for unqualified names)
DH`'ifdef(`MAIL_HUB', MAIL_HUB)

# class L: names that should be delivered locally, even if we have a relay
# class E: names that should be exposed as from this host, even if we masquerade
#CL root
CE root
undivert(5)dnl

# dequoting map
Kdequote dequote

divert(0)dnl
# who I masquerade as (null for no masquerading)
DM`'ifdef(`MASQUERADE_NAME', MASQUERADE_NAME)

undivert(6)dnl

######################
#   Special macros   #
######################

# SMTP initial login message
De`'confSMTP_LOGIN_MSG

# UNIX initial From header format
Dl`'confFROM_LINE

# my name for error messages
Dn`'confMAILER_NAME

# delimiter (operator) characters
Do`'confOPERATORS

# format of a total name
Dq`'ifdef(`confFROM_HEADER', confFROM_HEADER, `$?x$x <$g>$|$g$.')
include(`../m4/version.m4')

###############
#   Options   #
###############

# strip message body to 7 bits on input?
_OPTION(SevenBitInput, `confSEVEN_BIT_INPUT')

# 8-bit data handling
_OPTION(EightBitMode, `confEIGHT_BIT_HANDLING', adaptive)

# wait for alias file rebuild (default units: minutes)
_OPTION(AliasWait, `confALIAS_WAIT', 5m)

# location of alias file
O AliasFile=ifdef(`ALIAS_FILE', `ALIAS_FILE', /etc/aliases)

# minimum number of free blocks on filesystem
_OPTION(MinFreeBlocks, `confMIN_FREE_BLOCKS', 100)

# maximum message size
_OPTION(MaxMessageSize, `confMAX_MESSAGE_SIZE', 1000000)

# substitution for space (blank) characters
_OPTION(BlankSub, `confBLANK_SUB', _)

# avoid connecting to "expensive" mailers on initial submission?
_OPTION(HoldExpensive, `confCON_EXPENSIVE')

# checkpoint queue runs after every N successful deliveries
_OPTION(CheckpointInterval, `confCHECKPOINT_INTERVAL', 10)

# default delivery mode
_OPTION(DeliveryMode, `confDELIVERY_MODE', background)

# automatically rebuild the alias database?
_OPTION(AutoRebuildAliases, `confAUTO_REBUILD')

# error message header/file
_OPTION(ErrorHeader, `confERROR_MESSAGE', /etc/sendmail.oE)

# error mode
_OPTION(ErrorMode, `confERROR_MODE', print)

# save Unix-style "From_" lines at top of header?
_OPTION(SaveFromLine, `confSAVE_FROM_LINES')

# temporary file mode
_OPTION(TempFileMode, `confTEMP_FILE_MODE', 0600)

# match recipients against GECOS field?
_OPTION(MatchGECOS, `confMATCH_GECOS')

# maximum hop count
_OPTION(MaxHopCount, `confMAX_HOP', 17)

# location of help file
O HelpFile=ifdef(`HELP_FILE', HELP_FILE, /usr/lib/sendmail.hf)

# ignore dots as terminators in incoming messages?
_OPTION(IgnoreDots, `confIGNORE_DOTS')

# name resolver options
_OPTION(ResolverOptions, `confBIND_OPTS', +AAONLY)

# deliver MIME-encapsulated error messages?
_OPTION(SendMimeErrors, `confMIME_FORMAT_ERRORS')

# Forward file search path
_OPTION(ForwardPath, `confFORWARD_PATH', /var/forward/$u:$z/.forward.$w:$z/.forward)

# open connection cache size
_OPTION(ConnectionCacheSize, `confMCI_CACHE_SIZE', 2)

# open connection cache timeout
_OPTION(ConnectionCacheTimeout, `confMCI_CACHE_TIMEOUT', 5m)

# use Errors-To: header?
_OPTION(UseErrorsTo, `confUSE_ERRORS_TO')

# log level
_OPTION(LogLevel, `confLOG_LEVEL', 10)

# send to me too, even in an alias expansion?
_OPTION(MeToo, `confME_TOO')

# verify RHS in newaliases?
_OPTION(CheckAliases, `confCHECK_ALIASES')

# default messages to old style headers if no special punctuation?
_OPTION(OldStyleHeaders, `confOLD_STYLE_HEADERS')

# SMTP daemon options
_OPTION(DaemonPortOptions, `confDAEMON_OPTIONS', Port=esmtp)

# privacy flags
_OPTION(PrivacyOptions, `confPRIVACY_FLAGS', authwarnings)

# who (if anyone) should get extra copies of error messages
_OPTION(PostMasterCopy, `confCOPY_ERRORS_TO', Postmaster)

# slope of queue-only function
_OPTION(QueueFactor, `confQUEUE_FACTOR', 600000)

# queue directory
O QueueDirectory=ifdef(`QUEUE_DIR', QUEUE_DIR, /var/spool/mqueue)

# timeouts (many of these)
_OPTION(Timeout.initial, `confTO_INITIAL', 5m)
_OPTION(Timeout.helo, `confTO_HELO', 5m)
_OPTION(Timeout.mail, `confTO_MAIL', 10m)
_OPTION(Timeout.rcpt, `confTO_RCPT', 1h)
_OPTION(Timeout.datainit, `confTO_DATAINIT', 5m)
_OPTION(Timeout.datablock, `confTO_DATABLOCK', 1h)
_OPTION(Timeout.datafinal, `confTO_DATAFINAL', 1h)
_OPTION(Timeout.rset, `confTO_RSET', 5m)
_OPTION(Timeout.quit, `confTO_QUIT', 2m)
_OPTION(Timeout.misc, `confTO_MISC', 2m)
_OPTION(Timeout.command, `confTO_COMMAND', 1h)
_OPTION(Timeout.ident, `confTO_IDENT', 30s)
_OPTION(Timeout.fileopen, `confTO_FILEOPEN', 60s)
_OPTION(Timeout.queuereturn, `confTO_QUEUERETURN', 5d)
_OPTION(Timeout.queuereturn.normal, `confTO_QUEUERETURN_NORMAL', 5d)
_OPTION(Timeout.queuereturn.urgent, `confTO_QUEUERETURN_URGENT', 2d)
_OPTION(Timeout.queuereturn.non-urgent, `confTO_QUEUERETURN_NONURGENT', 7d)
_OPTION(Timeout.queuewarn, `confTO_QUEUEWARN', 4h)
_OPTION(Timeout.queuewarn.normal, `confTO_QUEUEWARN_NORMAL', 4h)
_OPTION(Timeout.queuewarn.urgent, `confTO_QUEUEWARN_URGENT', 1h)
_OPTION(Timeout.queuewarn.non-urgent, `confTO_QUEUEWARN_NONURGENT', 12h)

# should we not prune routes in route-addr syntax addresses?
_OPTION(DontPruneRoutes, `confDONT_PRUNE_ROUTES')

# queue up everything before forking?
_OPTION(SuperSafe, `confSAFE_QUEUE')

# status file
O StatusFile=ifdef(`STATUS_FILE', `STATUS_FILE', /etc/sendmail.st)

# time zone handling:
#  if undefined, use system default
#  if defined but null, use TZ envariable passed in
#  if defined and non-null, use that info
ifelse(confTIME_ZONE, `USE_SYSTEM', `#O TimeZoneSpec=',
        confTIME_ZONE, `USE_TZ', `O TimeZoneSpec=',
        `O TimeZoneSpec=confTIME_ZONE')

# default UID (can be username or userid:groupid)
_OPTION(DefaultUser, `confDEF_USER_ID', nobody)

# list of locations of user database file (null means no lookup)
_OPTION(UserDatabaseSpec, `confUSERDB_SPEC', /etc/userdb)

# fallback MX host
_OPTION(FallbackMXhost, `confFALLBACK_MX', fall.back.host.net)

# if we are the best MX host for a site, try it directly instead of config err
_OPTION(TryNullMXList, `confTRY_NULL_MX_LIST')

# load average at which we just queue messages
_OPTION(QueueLA, `confQUEUE_LA', 8)

# load average at which we refuse connections
_OPTION(RefuseLA, `confREFUSE_LA', 12)

# work recipient factor
_OPTION(RecipientFactor, `confWORK_RECIPIENT_FACTOR', 30000)

# deliver each queued job in a separate process?
_OPTION(ForkEachJob, `confSEPARATE_PROC')

# work class factor
_OPTION(ClassFactor, `confWORK_CLASS_FACTOR', 1800)

# work time factor
_OPTION(RetryFactor, `confWORK_TIME_FACTOR', 90000)

# shall we sort the queue by hostname first?
_OPTION(QueueSortOrder, `confQUEUE_SORT_ORDER', priority)

# minimum time in queue before retry
_OPTION(MinQueueAge, `confMIN_QUEUE_AGE', 30m)

# default character set
_OPTION(DefaultCharSet, `confDEF_CHAR_SET', iso-8859-1)

# service switch file (ignored on Solaris, Ultrix, OSF/1, others)
_OPTION(ServiceSwitchFile, `confSERVICE_SWITCH_FILE', /etc/service.switch)

# dialup line delay on connection failure
_OPTION(DialDelay, `confDIAL_DELAY', 10s)

# action to take if there are no recipients in the message
_OPTION(NoRecipientAction, `confNO_RCPT_ACTION', add-to-undisclosed)

# chrooted environment for writing to files
_OPTION(SafeFileEnvironment, `confSAFE_FILE_ENV', /arch)

# are colons OK in addresses?
_OPTION(ColonOkInAddr, `confCOLON_OK_IN_ADDR')

# how many jobs can you process in the queue?
_OPTION(MaxQueueRunSize, `confMAX_QUEUE_RUN_SIZE', 10000)

# shall I avoid expanding CNAMEs (violates protocols)?
_OPTION(DontExpandCnames, `confDONT_EXPAND_CNAMES')

###########################
#   Message precedences   #
###########################

Pfirst-class=0
Pspecial-delivery=100
Plist=-30
Pbulk=-60
Pjunk=-100

#####################
#   Trusted users   #
#####################

# this is equivalent to setting class "t"
#Ft/etc/sendmail.trusted
Troot
Tdaemon
Tuucp

#########################
#   Format of headers   #
#########################

H?P?Return-Path: $g
HReceived: confRECEIVED_HEADER
H?D?Resent-Date: $a
H?D?Date: $a
H?F?Resent-From: $q
H?F?From: $q
H?x?Full-Name: $x
HSubject:
# HPosted-Date: $a
# H?l?Received-Date: $b
H?M?Resent-Message-Id: <$t.$i@$j>
H?M?Message-Id: <$t.$i@$j>
ifdef(`_NULL_CLIENT_ONLY_',
        `include(../m4/nullrelay.m4)m4exit',
        `dnl')
#\f
######################################################################
######################################################################
#####
#####                   REWRITING RULES
#####
######################################################################
######################################################################

undivert(9)dnl

###########################################
###  Rulset 3 -- Name Canonicalization  ###
###########################################
S3

# handle null input (translate to <@> special case)
R$@                     $@ <@>

# strip group: syntax (not inside angle brackets!) and trailing semicolon
R$*                     $: $1 <@>                       mark addresses
R$* < $* > $* <@>       $: $1 < $2 > $3                 unmark <addr>
R$* :: $* <@>           $: $1 :: $2                     unmark node::addr
R:`include': $* <@>     $: :`include': $1                       unmark :`include':...
R$* : $* <@>            $: $2                           strip colon if marked
R$* <@>                 $: $1                           unmark
R$* ;                   $: $1                           strip trailing semi

# null input now results from list:; syntax
R$@                     $@ :; <@>

# basic textual canonicalization -- note RFC733 heuristic here
R$*<$*>$*<$*>$*         $2$3<$4>$5                      strip multiple <> <>
R$*<$*<$+>$*>$*         <$3>$5                          2-level <> nesting
R$*<>$*                 $@ <@>                          MAIL FROM:<> case
R$*<$+>$*               $2                              basic RFC821/822 parsing

# make sure <@a,@b,@c:user@d> syntax is easy to parse -- undone later
R@ $+ , $+              @ $1 : $2                       change all "," to ":"

# localize and dispose of route-based addresses
R@ $+ : $+              $@ $>96 < @$1 > : $2            handle <route-addr>

# find focus for list syntax
R $+ : $* ; @ $+        $@ $>96 $1 : $2 ; < @ $3 >      list syntax
R $+ : $* ;             $@ $1 : $2;                     list syntax

# find focus for @ syntax addresses
R$+ @ $+                $: $1 < @ $2 >                  focus on domain
R$+ < $+ @ $+ >         $1 $2 < @ $3 >                  move gaze right
R$+ < @ $+ >            $@ $>96 $1 < @ $2 >             already canonical

# do some sanity checking
R$* < @ $* : $* > $*    $1 < @ $2 $3 > $4               nix colons in addrs

ifdef(`_NO_UUCP_', `dnl',
`# convert old-style addresses to a domain-based address
R$- ! $+                $@ $>96 $2 < @ $1 .UUCP >       resolve uucp names
R$+ . $- ! $+           $@ $>96 $3 < @ $1 . $2 >                domain uucps
R$+ ! $+                $@ $>96 $2 < @ $1 .UUCP >       uucp subdomains
')
ifdef(`_USE_DECNET_SYNTAX_',
`# convert node::user addresses into a domain-based address
R$- :: $+               $@ $>96 $2 < @ $1 .DECNET >     resolve DECnet names
R$- . $- :: $+          $@ $>96 $3 < @ $1.$2 .DECNET >  numeric DECnet addr
',
        `dnl')
# if we have % signs, take the rightmost one
R$* % $*                $1 @ $2                         First make them all @s.
R$* @ $* @ $*           $1 % $2 @ $3                    Undo all but the last.
R$* @ $*                $@ $>96 $1 < @ $2 >             Insert < > and finish

# else we must be a local name
R$*                     $@ $>96 $1


################################################
###  Ruleset 96 -- bottom half of ruleset 3  ###
################################################

S96

# handle special cases for local names
R$* < @ localhost > $*          $: $1 < @ $j . > $2             no domain at all
R$* < @ localhost . $m > $*     $: $1 < @ $j . > $2             local domain
ifdef(`_NO_UUCP_', `dnl',
`R$* < @ localhost . UUCP > $*  $: $1 < @ $j . > $2             .UUCP domain')
R$* < @ [ $+ ] > $*             $: $1 < @@ [ $2 ] > $3          mark [a.b.c.d]
R$* < @@ $=w > $*               $: $1 < @ $j . > $3             self-literal
R$* < @@ $+ > $*                $@ $1 < @ $2 > $3               canon IP addr
ifdef(`DOMAIN_TABLE', `
# look up domains in the domain table
R$* < @ $+ > $*                 $: $1 < @ $(domaintable $2 $) > $3',
`dnl')
undivert(2)dnl

ifdef(`_NO_UUCP_', `dnl',
`ifdef(`UUCP_RELAY',
`# pass UUCP addresses straight through
R$* < @ $+ . UUCP > $*          $@ $1 < @ $2 . UUCP . > $3',
`# if really UUCP, handle it immediately
ifdef(`_CLASS_U_',
`R$* < @ $=U . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_V_',
`R$* < @ $=V . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_W_',
`R$* < @ $=W . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_X_',
`R$* < @ $=X . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')
ifdef(`_CLASS_Y_',
`R$* < @ $=Y . UUCP > $*        $@ $1 < @ $2 . UUCP . > $3', `dnl')

# try UUCP traffic as a local address
R$* < @ $+ . UUCP > $*          $: $1 < @ $[ $2 $] . UUCP . > $3
R$* < @ $+ . . UUCP . > $*              $@ $1 < @ $2 . > $3')
')
ifdef(`_NO_CANONIFY_', `dnl',
`# pass to name server to make hostname canonical
R$* < @ $* $~P > $*             $: $1 < @ $[ $2 $3 $] > $4')

# local host aliases and pseudo-domains are always canonical
R$* < @ $=w > $*                $: $1 < @ $2 . > $3
R$* < @ $* $=P > $*             $: $1 < @ $2 $3 . > $4
R$* < @ $* . . > $*             $1 < @ $2 . > $3

# if this is the local hostname, make sure we treat is as canonical
R$* < @ $j > $*                 $: $1 < @ $j . > $2


##################################################
###  Ruleset 4 -- Final Output Post-rewriting  ###
##################################################
S4

R$* <@>                 $@                              handle <> and list:;

# strip trailing dot off possibly canonical name
R$* < @ $+ . > $*       $1 < @ $2 > $3

# externalize local domain info
R$* < $+ > $*           $1 $2 $3                        defocus
R@ $+ : @ $+ : $+       @ $1 , @ $2 : $3                <route-addr> canonical
R@ $*                   $@ @ $1                         ... and exit

ifdef(`_NO_UUCP_', `dnl',
`# UUCP must always be presented in old form
R$+ @ $- . UUCP         $2!$1                           u@h.UUCP => h!u')

ifdef(`_USE_DECNET_SYNTAX_',
`# put DECnet back in :: form
R$+ @ $+ . DECNET       $2 :: $1                        u@h.DECNET => h::u',
        `dnl')
# delete duplicate local names
R$+ % $=w @ $=w         $1 @ $j                         u%host@host => u@host


##############################################################
###   Ruleset 97 -- recanonicalize and call ruleset zero   ###
###                (used for recursive calls)              ###
##############################################################

S`'97
R$*                     $: $>3 $1
R$*                     $@ $>0 $1


######################################
###   Ruleset 0 -- Parse Address   ###
######################################

S0

R<@>                    $#_LOCAL_ $: <@>                special case error msgs
R$* : $* ; <@>          $#error $@ 5.1.3 $: "list:; syntax illegal for recipient addresses"
R<@ $+>                 $#error $@ 5.1.1 $: "user address required"
R$* <$* : $* > $*       $#error $@ 5.1.1 $: "colon illegal in host name part"
R$* < @ . > $*          $#error $@ 5.1.2 $: "invalid host name"

ifdef(`_MAILER_smtp_',
`# handle numeric address spec
R$* < @ [ $+ ] > $*     $: $>98 $1 < @ [ $2 ] > $3      numeric internet spec
R$* < @ [ $+ ] > $*     $#_SMTP_ $@ [$2] $: $1 < @ [$2] > $3    still numeric: send',
        `dnl')

# now delete the local info -- note $=O to find characters that cause forwarding
R$* < @ > $*            $@ $>97 $1              user@ => user
R< @ $=w . > : $*       $@ $>97 $2              @here:... -> ...
R$* $=O $* < @ $=w . >  $@ $>97 $1 $2 $3                ...@here -> ...

# handle local hacks
R$*                     $: $>98 $1

# short circuit local delivery so forwarded email works
ifdef(`_MAILER_usenet_',
`R$+ . USENET < @ $=w . >       $#usenet $: $1          handle usenet specially',
        `dnl')
ifdef(`_STICKY_LOCAL_DOMAIN_',
`R$+ < @ $=w . >                $: < $H > $1 < @ $2 . >         first try hub
R< $+ > $+ < $+ >       $>95 < $1 > $2 < $3 >           yep ....
R< > $+ + $* < $+ >     $#_LOCAL_ $: $1 + $2            plussed name?
R< > $+ < $+ >          $#_LOCAL_ $: @ $1                       nope, local address',
`R$=L < @ $=w . >       $#_LOCAL_ $: @ $1               special local names
R$+ < @ $=w . >         $#_LOCAL_ $: $1                 regular local name')
ifdef(`MAILER_TABLE',
`
# not local -- try mailer table lookup
R$* <@ $+ > $*          $: < $2 > $1 < @ $2 > $3        extract host name
R< $+ . > $*            $: < $1 > $2                    strip trailing dot
R< $+ > $*              $: < $(mailertable $1 $) > $2   lookup
R< $- : $+ > $*         $# $1 $@ $2 $: $3               check -- resolved?
R< $+ > $*              $: $>90 <$1> $2                 try domain',
`dnl')
undivert(4)dnl

ifdef(`_NO_UUCP_', `dnl',
`# resolve remotely connected UUCP links (if any)
ifdef(`_CLASS_V_',
`R$* < @ $=V . UUCP . > $*              $: $>95 < $V > $1 <@$2.UUCP.> $3',
        `dnl')
ifdef(`_CLASS_W_',
`R$* < @ $=W . UUCP . > $*              $: $>95 < $W > $1 <@$2.UUCP.> $3',
        `dnl')
ifdef(`_CLASS_X_',
`R$* < @ $=X . UUCP . > $*              $: $>95 < $X > $1 <@$2.UUCP.> $3',
        `dnl')')

# resolve fake top level domains by forwarding to other hosts
ifdef(`BITNET_RELAY',
`R$*<@$+.BITNET.>$*     $: $>95 < $B > $1 <@$2.BITNET.> $3      user@host.BITNET',
        `dnl')
ifdef(`DECNET_RELAY',
`R$*<@$+.DECNET.>$*     $: $>95 < $C > $1 <@$2.DECNET.> $3      user@host.DECNET',
        `dnl')
ifdef(`_MAILER_pop_',
`R$+ < @ POP. >         $#pop $: $1                     user@POP',
        `dnl')
ifdef(`_MAILER_fax_',
`R$+ < @ $+ .FAX. >     $#fax $@ $2 $: $1               user@host.FAX',
`ifdef(`FAX_RELAY',
`R$*<@$+.FAX.>$*                $: $>95 < $F > $1 <@$2.FAX.> $3 user@host.FAX',
        `dnl')')

ifdef(`UUCP_RELAY',
`# forward non-local UUCP traffic to our UUCP relay
R$*<@$*.UUCP.>$*                $: $>95 < $Y > $1 <@$2.UUCP.> $3        uucp mail',
`ifdef(`_MAILER_uucp_',
`# forward other UUCP traffic straight to UUCP
R$* < @ $+ .UUCP. > $*          $#uucp $@ $2 $: $1 < @ $2 .UUCP. > $3   user@host.UUCP',
        `dnl')')
ifdef(`_MAILER_usenet_', `
# addresses sent to net.group.USENET will get forwarded to a newsgroup
R$+ . USENET            $#usenet $: $1',
        `dnl')

ifdef(`_LOCAL_RULES_',
`# figure out what should stay in our local mail system
undivert(1)', `dnl')

# pass names that still have a host to a smarthost (if defined)
R$* < @ $* > $*         $: $>95 < $S > $1 < @ $2 > $3   glue on smarthost name

# deal with other remote names
ifdef(`_MAILER_smtp_',
`R$* < @$* > $*         $#_SMTP_ $@ $2 $: $1 < @ $2 > $3                user@host.domain',
`R$* < @$* > $*         $#error $@ 5.1.2 $: Unrecognized host name $2')

# if this is quoted, strip the quotes and try again
R$+                     $: $(dequote $1 $)              strip quotes
R$+ $=O $+              $@ $>97 $1 $2 $3                        try again

# handle locally delivered names
R$=L                    $#_LOCAL_ $: @ $1                       special local names
R$+                     $#_LOCAL_ $: $1                 regular local names

###########################################################################
###   Ruleset 5 -- special rewriting after aliases have been expanded   ###
###########################################################################

S5

# deal with plussed users so aliases work nicely
R$+ + *                 $#_LOCAL_ $@ $&h $: $1
R$+ + $*                $#_LOCAL_ $@ $2 $: $1 + *

# prepend an empty "forward host" on the front
R$+                     $: <> $1

ifdef(`LUSER_RELAY',
`# send unrecognized local users to a relay host
R< > $+ + $*            $: < $L . > $( user $1 $) + $2
R< > $+                 $: < $L . > $( user $1 $)       look up user
R< $* > $+ <> $*        $: < > $2 $3                    found; strip $L
R< $* . > $+            $: < $1 > $2                    strip extra dot')

# handle plussed local names
R< > $+ + $*            $#_LOCAL_ $@ $2 $: $1

# see if we have a relay or a hub
R< > $+                 $: < $H > $1                    try hub
R< > $+                 $: < $R > $1                    try relay
R< > $+                 $@ $1                           nope, give up
R< $- : $+ > $+         $: $>95 < $1 : $2 > $3 < @ $2 >
R< $+ > $+              $@ $>95 < $1 > $2 < @ $1 >
ifdef(`MAILER_TABLE',
`

###################################################################
###  Ruleset 90 -- try domain part of mailertable entry         ###
###################################################################

S90
R$* <$- . $+ > $*       $: $1$2 < $(mailertable .$3 $@ $1$2 $@ $2 $) > $4
R$* <$- : $+ > $*       $# $2 $@ $3 $: $4               check -- resolved?
R$* < . $+ > $*         $@ $>90 $1 . <$2> $3            no -- strip & try again
R$* < $* > $*           $: < $(mailertable . $@ $1$2 $) > $3    try "."
R<$- : $+ > $*          $# $1 $@ $2 $: $3               "." found?
R< $* > $*              $@ $2                           no mailertable match',
`dnl')

###################################################################
###  Ruleset 95 -- canonify mailer:host syntax to triple        ###
###################################################################

S95
R< > $*                 $@ $1                           strip off null relay
R< $- : $+ > $*         $# $1 $@ $2 $: $3               try qualified mailer
R< $=w > $*             $@ $2                           delete local host
R< $+ > $*              $#_RELAY_ $@ $1 $: $2           use unqualified mailer

###################################################################
###  Ruleset 98 -- local part of ruleset zero (can be null)     ###
###################################################################

S98
undivert(3)dnl
#\f
######################################################################
######################################################################
#####
`#####                  MAILER DEFINITIONS'
#####
######################################################################
######################################################################
undivert(7)dnl