proto.m4

< linux网络编程工具>>配套源码

# else we must be a local name
R$*			$@ $>Canonify2 $1


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

SCanonify2=96

# 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')

# check for IPv6 domain literal (save quoted form)
R$* < @ [ IPv6 $- ] > $*	$: $2 $| $1 < @@ [ $(dequote $2 $) ] > $3	mark IPv6 addr
R$- $| $* < @@ $=w > $*		$: $2 < @ $j . > $4		self-literal
R$- $| $* < @@ [ $+ ] > $*	$@ $2 < @ [ IPv6 $1 ] > $4	canon IP addr

# check for IPv4 domain literal
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_', `dnl
# look up domains in the domain table
R$* < @ $+ > $* 		$: $1 < @ $(domaintable $2 $) > $3', `dnl')

undivert(2)dnl LOCAL_RULE_3

ifdef(`_BITDOMAIN_TABLE_', `dnl
# handle BITNET mapping
R$* < @ $+ .BITNET > $*		$: $1 < @ $(bitdomain $2 $: $2.BITNET $) > $3', `dnl')

ifdef(`_UUDOMAIN_TABLE_', `dnl
# handle UUCP mapping
R$* < @ $+ .UUCP > $*		$: $1 < @ $(uudomain $2 $: $2.UUCP $) > $3', `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')

ifdef(`_NO_CANONIFY_', `dnl', `dnl
# try UUCP traffic as a local address
R$* < @ $+ . UUCP > $*		$: $1 < @ $[ $2 $] . UUCP . > $3
R$* < @ $+ . . UUCP . > $*	$@ $1 < @ $2 . > $3')
')')
# hostnames ending in class P are always canonical
R$* < @ $* $=P > $*		$: $1 < @ $2 $3 . > $4
dnl apply the next rule only for hostnames not in class P
dnl this even works for phrases in class P since . is in class P
dnl which daemon flags are set?
R$* < @ $* $~P > $*		$: $&{daemon_flags} $| $1 < @ $2 $3 > $4
dnl the other rules in this section only apply if the hostname
dnl does not end in class P hence no further checks are done here
dnl if this ever changes make sure the lookups are "protected" again!
ifdef(`_NO_CANONIFY_', `dnl
dnl do not canonify unless:
dnl domain ends in class {Canonify} (this does not work if the intersection
dnl	with class P is non-empty)
dnl or {daemon_flags} has c set
# pass to name server to make hostname canonical if in class {Canonify}
R$* $| $* < @ $* $={Canonify} > $*	$: $2 < @ $[ $3 $4 $] > $5
# pass to name server to make hostname canonical if requested
R$* c $* $| $* < @ $* > $*	$: $3 < @ $[ $4 $] > $5
dnl trailing dot? -> do not apply _CANONIFY_HOSTS_
R$* $| $* < @ $+ . > $*		$: $2 < @ $3 . > $4
# add a trailing dot to qualified hostnames so other rules will work
R$* $| $* < @ $+.$+ > $*	$: $2 < @ $3.$4 . > $5
ifdef(`_CANONIFY_HOSTS_', `dnl
dnl this should only apply to unqualified hostnames
dnl but if a valid character inside an unqualified hostname is an OperatorChar
dnl then $- does not work.
# lookup unqualified hostnames
R$* $| $* < @ $* > $*	$: $2 < @ $[ $3 $] > $4', `dnl')', `dnl
dnl _NO_CANONIFY_ is not set: canonify unless:
dnl {daemon_flags} contains CC (do not canonify)
R$* CC $* $| $*			$: $3
# pass to name server to make hostname canonical
R$* $| $* < @ $* > $*		$: $2 < @ $[ $3 $] > $4')
dnl remove {daemon_flags} for other cases
R$* $| $*			$: $2

# local host aliases and pseudo-domains are always canonical
R$* < @ $=w > $*		$: $1 < @ $2 . > $3
ifdef(`_MASQUERADE_ENTIRE_DOMAIN_',
`R$* < @ $* $=M > $*		$: $1 < @ $2 $3 . > $4',
`R$* < @ $=M > $*		$: $1 < @ $2 . > $3')
ifdef(`_VIRTUSER_TABLE_', `dnl
dnl virtual hosts are also canonical
ifdef(`_VIRTUSER_ENTIRE_DOMAIN_',
`R$* < @ $* $={VirtHost} > $* 	$: $1 < @ $2 $3 . > $4',
`R$* < @ $={VirtHost} > $* 	$: $1 < @ $2 . > $3')',
`dnl')
dnl remove superfluous dots (maybe repeatedly) which may have been added
dnl by one of the rules before
R$* < @ $* . . > $*		$1 < @ $2 . > $3


##################################################
###  Ruleset 4 -- Final Output Post-rewriting  ###
##################################################
Sfinal=4

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

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

# eliminate internal code
R$* < @ *LOCAL* > $*	$1 < @ $j > $2

# 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				[e-mail] => h!u')

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



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

SRecurse=97
R$*			$: $>canonify $1
R$*			$@ $>parse $1


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

Sparse=0

R$*			$: $>Parse0 $1		initial parsing
R<@>			$#_LOCAL_ $: <@>		special case error msgs
R$*			$: $>ParseLocal $1	handle local hacks
R$*			$: $>Parse1 $1		final parsing

#
#  Parse0 -- do initial syntax checking and eliminate local addresses.
#	This should either return with the (possibly modified) input
#	or return with a #error mailer.  It should not return with a
#	#mailer other than the #error mailer.
#

SParse0
R<@>			$@ <@>			special case error msgs
R$* : $* ; <@>		$#error $@ 5.1.3 $: "501 List:; syntax illegal for recipient addresses"
R@ <@ $* >		< @ $1 >		catch "@@host" bogosity
R<@ $+>			$#error $@ 5.1.3 $: "501 User address required"
R$*			$: <> $1
R<> $* < @ [ $+ ] > $*	$1 < @ [ $2 ] > $3
R<> $* <$* : $* > $*	$#error $@ 5.1.3 $: "501 Colon illegal in host name part"
R<> $*			$1
R$* < @ . $* > $*	$#error $@ 5.1.2 $: "501 Invalid host name"
R$* < @ $* .. $* > $*	$#error $@ 5.1.2 $: "501 Invalid host name"
dnl comma only allowed before @; this check is not complete
R$* , $~O $*		$#error $@ 5.1.2 $: "501 Invalid route address"

# now delete the local info -- note $=O to find characters that cause forwarding
R$* < @ > $*		$@ $>Parse0 $>canonify $1	user@ => user
R< @ $=w . > : $*	$@ $>Parse0 $>canonify $2	@here:... -> ...
R$- < @ $=w . >		$: $(dequote $1 $) < @ $2 . >	dequote "foo"@here
R< @ $+ >		$#error $@ 5.1.3 $: "501 User address required"
R$* $=O $* < @ $=w . >	$@ $>Parse0 $>canonify $1 $2 $3	...@here -> ...
R$- 			$: $(dequote $1 $) < @ *LOCAL* >	dequote "foo"
R< @ *LOCAL* >		$#error $@ 5.1.3 $: "501 User address required"
R$* $=O $* < @ *LOCAL* >
			$@ $>Parse0 $>canonify $1 $2 $3	...@*LOCAL* -> ...
R$* < @ *LOCAL* >	$: $1

#
#  Parse1 -- the bottom half of ruleset 0.
#

SParse1
ifdef(`_LDAP_ROUTING_', `dnl
# handle LDAP routing for hosts in $={LDAPRoute}
R$+ < @ $={LDAPRoute} . >	$: $>LDAPExpand <$1 < @ $2 . >> <$1 @ $2>',
`dnl')

ifdef(`_MAILER_smtp_',
`# handle numeric address spec
dnl there is no check whether this is really an IP number
R$* < @ [ $+ ] > $*	$: $>ParseLocal $1 < @ [ $2 ] > $3	numeric internet spec
R$* < @ [ $+ ] > $*	$1 < @ [ $2 ] : $S > $3		Add smart host to path
R$* < @ [ IPv6 $- ] : > $*
		$#_SMTP_ $@ [ $(dequote $2 $) ] $: $1 < @ [IPv6 $2 ] > $3	no smarthost: send
R$* < @ [ $+ ] : > $*	$#_SMTP_ $@ [$2] $: $1 < @ [$2] > $3	no smarthost: send
R$* < @ [ $+ ] : $- : $*> $*	$#$3 $@ $4 $: $1 < @ [$2] > $5	smarthost with mailer
R$* < @ [ $+ ] : $+ > $*	$#_SMTP_ $@ $3 $: $1 < @ [$2] > $4	smarthost without mailer',
	`dnl')

ifdef(`_VIRTUSER_TABLE_', `dnl
# handle virtual users
R$+			$: <!> $1		Mark for lookup
ifdef(`_VIRTUSER_ENTIRE_DOMAIN_',
`R<!> $+ < @ $* $={VirtHost} . > 	$: < $(virtuser $1 @ $2 $3 $@ $1 $: @ $) > $1 < @ $2 $3 . >',
`R<!> $+ < @ $={VirtHost} . > 	$: < $(virtuser $1 @ $2 $@ $1 $: @ $) > $1 < @ $2 . >')
R<!> $+ < @ $=w . > 	$: < $(virtuser $1 @ $2 $@ $1 $: @ $) > $1 < @ $2 . >
R<@> $+ + $* < @ $* . >
			$: < $(virtuser $1 + * @ $3 $@ $1 $@ $2 $: @ $) > $1 + $2 < @ $3 . >
R<@> $+ + $* < @ $* . >
			$: < $(virtuser $1 @ $3 $@ $1 $: @ $) > $1 + $2 < @ $3 . >
dnl try default entry: @domain
dnl +*@domain
R<@> $+ + $+ < @ $+ . >	$: < $(virtuser + * @ $3 $@ $1 $@ $2 $: @ $) > $1 + $2 < @ $3 . >
dnl @domain if +detail exists
R<@> $+ + $* < @ $+ . >	$: < $(virtuser @ $3 $@ $1 $@ $2 $: @ $) > $1 + $2 < @ $3 . >
dnl without +detail (or no match)
R<@> $+ < @ $+ . >	$: < $(virtuser @ $2 $@ $1 $: @ $) > $1 < @ $2 . >
R<@> $+			$: $1
R<!> $+			$: $1
R< error : $-.$-.$- : $+ > $* 	$#error $@ $1.$2.$3 $: $4
R< error : $- $+ > $* 	$#error $@ $(dequote $1 $) $: $2
R< $+ > $+ < @ $+ >	$: $>Recurse $1',
`dnl')

# short circuit local delivery so forwarded email works
ifdef(`_MAILER_usenet_', `dnl
R$+ . USENET < @ $=w . >	$#usenet $@ usenet $: $1	handle usenet specially', `dnl')


ifdef(`_STICKY_LOCAL_DOMAIN_',
`R$+ < @ $=w . >		$: < $H > $1 < @ $2 . >		first try hub
R< $+ > $+ < $+ >	$>MailerToTriple < $1 > $2 < $3 >	yep ....
dnl $H empty (but @$=w.)
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_', `dnl
# 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
dnl it is $~[ instead of $- to avoid matches on IPv6 addresses
R< $~[ : $* > $* 	$>MailerToTriple < $1 : $2 > $3		check -- resolved?
R< $+ > $*		$: $>Mailertable <$1> $2		try domain',
`dnl')
undivert(4)dnl UUCP rules from `MAILER(uucp)'

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

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

ifdef(`UUCP_RELAY',
`# forward non-local UUCP traffic to our UUCP relay
R$*<@$*.UUCP.>$*		$: $>MailerToTriple < $Y > $1 <@$2.UUCP.> $3	uucp mail',
`ifdef(`_MAILER_uucp_',
`# forward other UUCP traffic straight to UUCP
R$* < @ $+ .UUCP. > $*		$#_UUCP_ $@ $2 $: $1 < @ $2 .UUCP. > $3	[e-mail]',
	`dnl')')
ifdef(`_MAILER_usenet_', `
# addresses sent to net.group.USENET will get forwarded to a newsgroup
R$+ . USENET		$#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$* < @ $* > $*		$: $>MailerToTriple < $S > $1 < @ $2 > $3	glue on smarthost name

# deal with other remote names
ifdef(`_MAILER_smtp_',
`R$* < @$* > $*		$#_SMTP_ $@ $2 $: $1 < @ $2 > $3	[e-mail]',
`R$* < @$* > $*		$#error $@ 5.1.2 $: "501 Unrecognized host name " $2')

# 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   ###
###########################################################################

SLocal_localaddr
Slocaladdr=5
R$+			$: $1 $| $>"Local_localaddr" $1
R$+ $| $#$*		$#$2
R$+ $| $*		$: $1

ifdef(`_FFR_5_', `
# Preserve host in a macro
R$+			$: $(macro {LocalAddrHost} $) $1
R$+ @ $+		$: $(macro {LocalAddrHost} $@ @ $2 $) $1')

ifdef(`_PRESERVE_LOCAL_PLUS_DETAIL_', `', `
# deal with plussed users so aliases work nicely
R$+ + *			$#_LOCAL_ $@ $&h $: $1`'ifdef(`_FFR_5_', ` $&{LocalAddrHost}')
R$+ + $*		$#_LOCAL_ $@ + $2 $: $1 + *`'ifdef(`_FFR_5_', ` $&{LocalAddrHost}')