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tcpip-sources/relay.mac
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TITLE RELAY Module to handle hosts defined in MAILER-RELAY-INFO.TXT
SUBTTL Written by C. Hedrick/CLH/MRC
SEARCH MACSYM,MONSYM ;System definitions
SALL ;Suppress macro expansions
.DIRECTIVE FLBLST ;Sane listings for ASCIZ, etc.
EXTERN $ADDOM,CPYSTR
SUBTTL Definitions
A=1 ;JSYS/argument passing
B=2 ;...
C=3 ;...
D=4 ;...
;P=17 ;Stack pointer
; Character definitions
.CHDQT==42 ;Double quote
SUBTTL Paged storage
.PSECT DATPAG
DEFINE DEFPAG (ADDR,LENGTH) <
ADDR: IFB <LENGTH>,<BLOCK 1000>
IFNB <LENGTH>,<BLOCK 1000*LENGTH>
>;DEFINE DEFPAG
RLYPGS==2
DEFPAG RLYTBL,RLYPGS ;TBLUK table for host/nicknames
.ENDPS
SUBTTL Impure storage
.PSECT DATA
BRCHAR: BLOCK 1 ;Break char, in INIRLY
RLYJFN: BLOCK 1 ;JFN for reading RELAYS.TXT
RLYSTK: BLOCK 1 ;Saved P for nonlocal exit in INIRLY
MEMALC: BLOCK 1 ;Address of memory allocator
HSTNME: BLOCK 1 ;Address of hostname
DMTBLL==50
DOMTAB: BLOCK DMTBLL+1 ;TBLUK table for pseudo-domains
STRBFL==30 ;Length of string buffers
STRBFR: BLOCK STRBFL ;String buffer, used globally
SUBTTL Relay code
;Basic data structures:
DM%LEN==:3 ;Pseudo-domain block:
DM%NAM==:0 ; Pointer to ASCIZ name of the pseudo-domain
DM%RLY==:1 ; Pointer to a list of hosts that will relay to this pseudo-domain
DM%TRN==:2 ; Pointer to ASCIZ text to be used for transmogrification.
; The first character is % or . and the rest are a host
; name. foo@HOST will transmogrify to foo%HOST@new-host
HS%LEN==2 ;Host block:
HS%DOM==0 ; Address of pseudo-domain descriptor block
HS%CAN==1 ; Canonical name of host, including .PSEUDO-DOMAIN, ASCIZ
;Nickname block:
; Nickname, ASCIZ, including .PSEUDO-DOMAIN
;TBLUK tables:
; Hosts/nicknames
; Pseudo-domains
.ENDPS
.PSECT CODE
; $GTRLY - Gets a relay host name
; Accepts:
; a/ pointer to host name
; CALL $GTRLY
; Returns +1: Failure
; +2: Success, with pointer to canonical name in A, pseudo-domain block in B
$GTRLY::SAVEAC <C,D>
STKVAR <HSTPTR,DOMPTR,<STRBF1,STRBFL>>
TXC A,.LHALF ; is source LH -1?
TXCN A,.LHALF
HRLI A,(<POINT 7,>) ; yes, set up byte pointer
MOVEM A,HSTPTR
;We want the match to be exact, except that the user may omit
;the pseudo-domain. The strings in the table all have pseudo-domains. The
;easiest way to do this is (1) if the user supplies a pseudo-domain
;force the match to be exact; (2) if not, stick on a dot and
;then allow any match that doesn't have TL%NOM set.
;First question. Does the user's string include a pseudo-domain?
SETZM DOMPTR
DO.
ILDB B,A
CAIN B,"."
MOVEM A,DOMPTR
JUMPN B,TOP.
ENDDO.
SKIPN B,DOMPTR ;If have a pseudo-domain candidate
IFSKP.
MOVEI A,DOMTAB ;Is it really a pseudo-domain and not just
TBLUK% ;part of the host name
ANDXN. B,TL%EXM ;Have a pseudo-domain?
HRRZM A,DOMPTR ;Save pointer to pseudo-domain block
MOVE B,HSTPTR ;Do an exact match
MOVEI A,RLYTBL
TBLUK%
IFXE. B,TL%EXM ;Host is unknown
HRRZ B,@DOMPTR ;Return pseudo-domain block in B
MOVE A,HSTPTR ;And host name in A
RETSKP
ENDIF.
ELSE.
;No, stick on a dot and allow anything
MOVEI A,STRBF1
HRLI A,<(POINT 7,)>
MOVE B,HSTPTR ;Have to copy to STRBFR
MOVX D,<STRBFL*5>-2 ;Space for dot and null
DO.
ILDB C,B ;Copy string sans null
IFN. C
IDPB C,A ;Non-null
SOJGE D,TOP. ;Still more possible
RET ;String impossibly long
ENDIF.
ENDDO.
MOVEI C,"." ;Now add the dot
IDPB C,A
SETZ C,
IDPB C,A
MOVEI A,RLYTBL
MOVE B,[POINT 7,STRBF1]
TBLUK%
JXN B,TL%NOM,R ;Any match is OK here
ENDIF.
HRRZ A,(A) ;Address of host block
MOVE B,HS%DOM(A) ;Pseudo-domain block
HRRI A,HS%CAN(A) ;Name
HRLI A,(<POINT 7,>) ;Make pointer
RETSKP
ENDSV.
;INIRLY sets up the tables involving relaying. Here is the file format:
;RELAY MIT-CHAOS,%MC.LCS.MIT.EDU,MC.LCS.MIT.EDU,XX.LCS.MIT.EDU
; pseudo-domain name
; string for transmogrification
; list of hosts you can relay via
;RELAY SU-NET,%SCORE.STANFORD.EDU,SCORE.STANFORD.EDU,SUMEX-AIM.STANFORD.EDU
;HOST MIT-CHAOS,OZ.AI.MIT.EDU
; pseudo-domain name
; primary name, without pseudo-domain
; nicknames, any pseudo-domains will be ignored
;HOST SU-NET,TINY.STANFORD.EDU,SUMEX-2020
;INIRLY
; A/ address of ALCBLC. This routine takes a block size in A and
; returns a block of that size in B.
; B/ address of HSTNAM. This routine takes a string in B and returns
; the representation that the caller wants for a host. It is
; used to construct lists of hosts for relaying. If the caller
; passes 0, host lists will not be constructed.
;return + 1 always, with address of DOMTAB in A
$INRLY::SAVEAC <B,C,D>
ACVAR <T,TT>
STKVAR <BLKSIZ,HSTBLK>
MOVEM A,MEMALC ;Save address of memory allocator
MOVEM B,HSTNME ;And address of host name thing
MOVEM P,RLYSTK ;Save P for nonlocal exit at EOF
MOVEI A,<RLYPGS*1000>-1 ;Init TBLUK tables
MOVEM A,RLYTBL
MOVEI A,DMTBLL
MOVEM A,DOMTAB
MOVX A,GJ%SHT!GJ%OLD!GJ%PHY
HRROI B,[ASCIZ/MAIL:MAILER-RELAY-INFO.TXT/]
GTJFN%
ERJMP INRRET
MOVEM A,RLYJFN
MOVX B,7B5!OF%RD
OPENF%
IFJER.
MOVE A,RLYJFN
RLJFN%
NOP
TMSG <%Can't open MAIL:MAILER-RELAY-INFO.TXT
>
JRST INRRET
ENDIF.
SETZ T,
DO.
CALL RDATOM ;Get an atom
MOVE C,STRBFR ;Now look at the atom
ANDCM C,[1+<BYTE (7) 040,040,040,040,040>] ;Upper caseify
CAMN C,[ASCII/RELAY/]
JRST RDDOM
CAMN C,[ASCII/HOST/]
JRST RDHST
RDEOL: MOVE A,RLYJFN
MOVE B,BRCHAR
DO.
CAIN B,.CHLFD
EXIT.
BIN%
ERJMP RLYEOF
LOOP.
ENDDO.
LOOP.
DM%LEN=3 ;Pseudo-domain block:
DM%NAM=0 ; Pointer to ASCIZ name of the pseudo-domain
DM%RLY=1 ; Pointer to a list of hosts that will relay to this pseudo-domain
DM%TRN=2 ; Pointer to ASCIZ text to be used for transmogrification.
; The first character is % or . and the rest are a host
; name. foo@HOST will transmogrify to foo%HOST@new-host
HS%LEN=2 ;Host block:
HS%DOM=0 ; Address of pseudo-domain descriptor block
HS%CAN=1 ; Canonical name of host, including .PSEUDO-DOMAIN, ASCIZ
;Here for RELAY command. Build up a pseudo-domain block, and add it to DOMTAB.
; The relay list is built up in T
RDDOM: SETZ T, ;Start with empty list
MOVEI A,DM%LEN ;Generate pseudo-domain block
CALL @MEMALC
IFNSK.
TMSG <%No space for pseudo-domain block - please report this
>
JRST RLYEOF
ENDIF.
MOVE TT,B
MOVE A,RLYJFN
MOVX B,"$" ;Funny initial character
MOVE C,[POINT 7,STRBFR]
MOVX D,<STRBFL*5>-2 ;Max keyword length
SETZM STRBFR ;Clear the guy first
IDPB B,C ;Stuff that in
CALL RDATM1 ;Pseudo-domain name
LDB A,[POINT 7,STRBFR,13] ;Make sure there is one
IFE. A
TMSG <%Missing pseudo-domain name
>
JRST RDEOL
ENDIF.
MOVEI A,STRBFR
CALL CPYSTR ;Copy it into free space
MOVEM B,DM%NAM(TT)
MOVE A,RLYJFN
DO.
BIN%
ERJMP RLYEOF
CAIE B,.CHCRT
CAIN B,.CHLFD
IFNSK.
TMSG <%Missing transmogrification character
>
JRST RDEOL
ENDIF.
CAIE B,.CHSPC
CAIN B,.CHTAB ;Skip space
LOOP.
ENDDO.
MOVE C,[POINT 7,STRBFR]
SETZM STRBFR
IDPB B,C ;Put funny char at beginning of name
MOVX D,<STRBFL*5>-2 ;Max keyword length
CALL RDATM1 ;Now read host for transmogrification
MOVEI A,STRBFR
CALL CPYSTR ;Copy it into free space
MOVEM B,DM%TRN(TT)
MOVE A,RLYJFN
DO. ;Now make up relay list
CALL RDATOM ;Host name into STRBFR
SKIPN STRBFR ;Check for syntax error
IFSKP.
MOVE B,[POINT 7,STRBFR]
CALL RLCONS
ENDIF.
MOVE B,BRCHAR
CAIE B,.CHCRT
IFSKP.
BIN%
ERJMP RLYEOF
ENDIF.
CAIE B,.CHLFD
LOOP.
ENDDO.
MOVEM T,DM%RLY(TT) ;T (from RLCONS) is now relay list
MOVEI A,DOMTAB ;Now add it to pseudo-domain table
HRL B,DM%NAM(TT) ;Get name,,pseudo-domain block
HRR B,TT
TBADD% ;And add to table
ERCAL TBADLZ
MOVE A,RLYJFN ;Get back JFN
LOOP.
;Here for HOST command. Build up the RELAY spec in T
;Build a host block and nickname blocks, and add to RLYTBL
RDHST: MOVX B,"$" ;Funny initial character
MOVE C,[POINT 7,STRBFR]
MOVX D,<STRBFL*5>-2 ;Max keyword length
SETZM STRBFR ;Clear the guy first
IDPB B,C ;Stuff that in
CALL RDATM1 ;Pseudo-domain name
LDB A,[POINT 7,STRBFR,13] ;Make sure there is one
JUMPE A,RDEOL ;Ignore line
HRROI B,STRBFR ;And look up pseudo-domain
MOVEI A,DOMTAB ;In pseudo-domain table
TBLUK%
JXE B,TL%EXM,RDEOL ;Don't worry about host if no match
HRRZ TT,(A) ;Get pseudo-domain block for this pseudo-domain
MOVE A,RLYJFN
CALL RDATOM ;Now main name
SETO A, ;Need to back over null
ADJBP A,C ;Host
HRRO B,DM%NAM(TT) ;Pseudo-domain
CALL $ADDOM
IBP A
MOVEI A,-STRBFR+2(A) ;Size of block needed
MOVEM A,BLKSIZ ;Save for later
CALL @MEMALC ;Address of block to B
IFNSK.
TMSG <%No space for host block - please report this
>
JRST RDEOL
ENDIF.
MOVEM B,HSTBLK ;This is the host block
HRLI A,STRBFR ;Copy name to block
HRRI A,1(B) ;Leave one word for code
MOVE C,BLKSIZ
ADD C,B
BLT A,-1(C) ;Name
MOVEM TT,(B) ;Put in list of relay hosts
HRLI B,1(B) ;Now have nickname,,host block
MOVEI A,RLYTBL
TBADD%
ERCAL TBADLZ
MOVE A,RLYJFN
MOVE B,BRCHAR
DO.
MOVE B,BRCHAR
CAIE B,.CHCRT
IFSKP.
BIN%
ERJMP RLYEOF
ENDIF.
CAIN B,.CHLFD
EXIT.
CALL RDATOM
SKIPN STRBFR ;Check for syntax error
IFSKP.
SETO A, ;Need to back over null
ADJBP A,C ;Host
HRRO B,DM%NAM(TT) ;Pseudo-domain
CALL $ADDOM
IBP A
MOVEI A,-STRBFR+1(A) ;Size of block needed
MOVEM A,BLKSIZ ;Save for later
CALL @MEMALC ;Addr of block to B
IFNSK.
TMSG <%No space for relay block - please report this
>
JRST RDEOL
ENDIF.
HRLI A,STRBFR ;Copy name to block
HRRI A,(B)
MOVE C,BLKSIZ
ADD C,B
BLT A,-1(C) ;Name
HRL B,B ;Now have nickname,,host block
HRR B,HSTBLK
MOVEI A,RLYTBL
TBADD%
ERCAL TBADLZ
MOVE A,RLYJFN
ENDIF.
LOOP.
ENDDO.
LOOP.
ENDDO.
RLYEOF: MOVE P,RLYSTK ;Restore stack for nonlocal exit
MOVE A,RLYJFN
CLOSF%
NOP
INRRET: MOVEI A,DOMTAB ;Return pseudo-domain table
RET
TBADLZ: SAVEAC <A,B,C>
TMSG <%Entry in MAIL:MAILER-RELAY-INFO.TXT ">
HLRO A,B ;Name that couldn't be added
PSOUT%
TMSG <" ignored - >
MOVX A,.PRIOU ;To primary output
HRLOI B,.FHSLF ;This process,,last error
SETZ C, ;No limit
ERSTR%
NOP
NOP
TMSG <
>
RET
ENDSV.
;RDATOM
;A - jfn
;B - returns break char
;C - returns updated pointer to STRBFR
;Jumps to RLYEOF at end
;sets BRCHAR to break char
RDATOM: SETZM STRBFR
MOVE C,[POINT 7,STRBFR] ;Place to put keyword
MOVX D,<STRBFL*5>-1 ;Max keyword length
RDATM1: DO.
BIN%
ERJMP RLYEOF
CAIE B,.CHSPC ;Skip spaces
CAIN B,.CHTAB
LOOP.
ENDDO.
DO. ;Collect an atom
CAIE B,.CHSPC ;Stop at break chars
CAIN B,.CHTAB
EXIT.
CAIE B,","
CAIGE B,.CHSPC
EXIT.
IDPB B,C ;Else file it away
SOJLE D,[TMSG <%Atom too long in MAILER-RELAY-INFO.TXT
>
JRST RLYEOF]
BIN%
ERJMP RLYEOF
LOOP.
ENDDO.
MOVEM B,BRCHAR
SETZ B,
IDPB B,C
MOVE B,BRCHAR
RET
;B - string pointer to relay host name
;T - old list
;returns T - new list
RLCONS: SKIPN HSTNME ;Does the user want relay host lists?
RET ;No, forget it
SAVEAC <A,C>
STKVAR <HSTPTR>
CALL @HSTNME ;Convert string pointer to host pointer
RET
IFN. T ;First item?
MOVEI A,1 ;No, need to CONS up list element
MOVEM B,HSTPTR ;Save pointer
CALL @MEMALC
IFNSK.
TMSG <%No space for cons block - please report this
>
RET ;This should be impossible
ENDIF.
MOVE A,HSTPTR ;Put address of new entry
HRRZM A,(B) ;In free word we just got
MOVEI A,T ;A := current entry
DO.
HLRZ C,(A) ;Get next in list
IFN. C ;End of list?
MOVEI A,(C) ;No, make this the current entry
LOOP. ;Run down rest of list
ENDIF.
ENDDO.
HRLM B,(A) ;Put new entry at end of list
ELSE.
MOVE T,B ;First time, just use T
ENDIF.
RET
ENDAV.
ENDSV.
...LIT: XLIST
LIT
LIST
END