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Annotation of 43BSD/usr.lib/sendmail/cf.named/rule0.m4, revision 1.1

1.1     ! root        1: divert(10)
        !             2: #
        !             3: #  Sendmail
        !             4: #  Copyright (c) 1983  Eric P. Allman
        !             5: #  Berkeley, California
        !             6: #
        !             7: #  Copyright (c) 1983 Regents of the University of California.
        !             8: #  All rights reserved.  The Berkeley software License Agreement
        !             9: #  specifies the terms and conditions for redistribution.
        !            10: #
        !            11: #      @(#)rule0.m4    1.6 (Berkeley) 2/26/86
        !            12: #
        !            13: divert(0)
        !            14: ############################################################
        !            15: ############################################################
        !            16: #####
        !            17: #####          RULESET ZERO PREAMBLE
        !            18: #####
        !            19: #####  The beginning of ruleset zero is constant through all
        !            20: #####  configurations.
        !            21: #####
        !            22: ############################################################
        !            23: ############################################################
        !            24: 
        !            25: S0
        !            26: 
        !            27: # first make canonical
        !            28: R$*<$*>$*              $1$2$3                          defocus
        !            29: R$+                    $:$>3$1                         make canonical
        !            30: 
        !            31: # handle special cases.....
        !            32: R$*<@[$+]>$*           $:$1<@$[[$2]$]>$3               lookup numeric internet addr
        !            33: R$*<@[$+]>$*           $#tcp$@[$2]$:$1@[$2]$3          numeric internet spec
        !            34: R$+                    $:$>6$1
        !            35: R$-<@LOCAL>            $#local$:$1
        !            36: R@                     $#local$:$n                     handle <> form
        !            37: 
        !            38: # canonicalize using the nameserver if not internal domain
        !            39: R$*<@$*.$~I>$*         $:$1<@$[$2.$3$]>$4
        !            40: R$*<@$->$*             $:$1<@$[$2$]>$3
        !            41: 
        !            42: # arrange for local names to be fully qualified
        !            43: R$*<$+.ARPA.LOCAL>$*   $1<$2.ARPA>$3                   because ARPA is a host
        !            44: 
        !            45: # now delete the local info
        !            46: R$*<$*$=w.$=T>$*       $1<$2>$5                        thishost.LOCAL
        !            47: R$*<$*$=w>$*           $1<$2>$4                        thishost
        !            48: R$*<$*.>$*             $1<$2>$3                        drop trailing dot
        !            49: R<@>:$*                        $@$>0$1                         retry after route strip
        !            50: R$*<@>                 $@$>0$1                         strip null trash & retry
        !            51: 
        !            52: # forward around hosts with communication problems
        !            53: R$*<@$=F.LOCAL>$*      $#tcp$@$F$:$1<@$2.LOCAL>$3      reroute message
        !            54: 
        !            55: ##################################
        !            56: #  End of ruleset zero preamble  #
        !            57: ##################################

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