DIRECTORY
Arpa USING [Address, nullAddress],
ArpaConfig USING [ourLocalName, resolv],
ArpaSMTPControl USING [arpaMSPort, OKToAcceptSMTPInput],
ArpaSMTPDescr USING [Create, CreateFailed, Descr, Unparse],
ArpaSMTPQueue USING [AddNewMessage, StartNewMessage],
ArpaSMTPRcvr USING [],
ArpaSMTPSupport USING [Log, Now],
ArpaSMTPSyntax USING [BlessReturnPath],
ArpaTCP USING [DByte, AbortTCPStream, CreateTCPStream, Error, ErrorFromStream, GetRemoteSocket, TCPInfo, Timeout, WaitForListenerOpen],
ConvertExtras USING [RopeFromArpaAddress],
IO USING [Close, CreateStream, CreateStreamProcs, EndOfStream, Error, Flush, GetChar, PeekChar, PutChar, PutRope, STREAM, StreamProcs, StreamVariety],
Process USING [Abort, Detach],
RefText USING [Fetch, Find, InlineAppendChar, New, SkipOver],
Rope USING [Cat, Concat, Equal, Find, FromRefText, IsEmpty, NewText, ROPE, SkipOver, Substr, Text],
RuntimeError USING [BoundsFault];
ArpaSMTPRcvrImpl: CEDAR PROGRAM
IMPORTS
ArpaConfig, ArpaSMTPControl, ArpaSMTPDescr, ArpaSMTPQueue, ArpaSMTPSupport, ArpaSMTPSyntax, ArpaTCP, ConvertExtras, IO, Process, RefText, Rope, RuntimeError
EXPORTS ArpaSMTPRcvr =
BEGIN
ROPE: TYPE = Rope.ROPE;
STREAM: TYPE = IO.STREAM;
RC: TYPE = {
rc211, rc214, rc220, rc221, rc250, rc251,
rc354,
rc421, rc450, rc451, rc452,
rc500, rc501, rc502, rc503, rc504, rc550, rc551, rc552, rc553, rc554};
ReplyRec: TYPE ~ RECORD [rc, text: ROPE];
Replies: ARRAY RC OF ReplyRec = [
rc211: ReplyRec["211", "System status"],
rc214: ReplyRec["214", "Help Message"],
rc220: ReplyRec["220", Rope.Concat[ArpaConfig.ourLocalName, " Simple Mail Transfer Service ready"]],
rc221: ReplyRec["221", Rope.Concat[ArpaConfig.ourLocalName, " Service closing transmission channel"]],
rc250: ReplyRec["250", "Requested mail action okay, completed"],
rc251: ReplyRec["251", "User not local"],

rc354: ReplyRec["354", "Start mail input; end with <CRLF>.<CRLF>"],

rc421: ReplyRec["421", Rope.Concat[ArpaConfig.ourLocalName, "Service not available, closing channel"]],
rc450: ReplyRec["450", "Requested mail action not taken: mailbox unavailable"],
rc451: ReplyRec["451", "Requested action aborted: local error in processing"],
rc452: ReplyRec["452", "Requested action not taken: insufficient system storage"],

rc500: ReplyRec["500", "Syntax error, command unrecognized"],
rc501: ReplyRec["501", "Syntax error in parameters or arguments"],
rc502: ReplyRec["502", "Command not implemented"], 
rc503: ReplyRec["503", "Bad sequence of commands"],
rc504: ReplyRec["504", "Command parameter not implemented"],
rc550: ReplyRec["550", "Requested action not taken: mailbox unavailable"],
rc551: ReplyRec["551", "User not local"],
rc552: ReplyRec["552", "Requested mail action aborted: exceeded storage allocation"],
rc553: ReplyRec["553", "Requested action not taken: mailbox name not allowed"],
rc554: ReplyRec["554", "Transaction failed"]];
Reply: PROC [out: IO.STREAM, rc: RC, t1, t2, t3, t4, t5, t6, t7, t8: ROPE _ NIL] = {
r: ReplyRec ~ Replies[rc];
IF t1 = NIL AND t2 = NIL AND t3 = NIL AND t4 = NIL AND t5 = NIL AND t6 = NIL AND t7 = NIL AND t8 = NIL THEN t1 _ r.text;
out.PutRope[r.rc];
out.PutChar[' ];
out.PutRope[t1];
out.PutRope[t2];
out.PutRope[t3];
out.PutRope[t4];
out.PutRope[t5];
out.PutRope[t6];
out.PutRope[t7];
out.PutRope[t8];
out.PutRope["\n\l"];
out.Flush[];
}; -- end Reply
CMD: TYPE = {helo, mail, rcpt, data, rset, send, soml, saml, vrfy, expn, help, noop, quit, turn};
CommandProc: TYPE = PROC [session: REF SessionRec];
CommandRec: TYPE = RECORD [name: ROPE, Action: CommandProc _ NotImpl];
Commands: ARRAY CMD OF CommandRec = [
helo: CommandRec["HELO", HELOcmd],
mail: CommandRec["MAIL", MAILcmd],
rcpt: CommandRec["RCPT", RCPTcmd],
data: CommandRec["DATA", DATAcmd],
rset: CommandRec["RSET", RSETcmd],
send: CommandRec["SEND"],
soml: CommandRec["SOML"],
saml: CommandRec["SAML"],
vrfy: CommandRec["VRFY"],
expn: CommandRec["EXPN"],
help: CommandRec["HELP"],
noop: CommandRec["NOOP", NOOPcmd],
quit: CommandRec["QUIT", QUITcmd],
turn: CommandRec["TURN"] ];
CommandState: TYPE = REF CmdRestr;
CmdRestr: TYPE = ARRAY CMD OF BOOL;
InitState: CommandState =
 NEW[CmdRestr _ [ T, F, F, F, F, F, F, F, F, F, F, F, T, F ]];
ReadyState: CommandState =
 NEW[CmdRestr _ [ T, T, F, F, T, T, T, T, T, T, T, T, T, T ]];
RcptState: CommandState =
 NEW[CmdRestr _ [ F, F, T, F, T, F, F, F, F, F, F, T, T, F ]];
DataState: CommandState =
 NEW[CmdRestr _ [ F, F, T, T, T, F, F, F, F, F, F, T, T, F ]];
T: BOOL = TRUE;
F: BOOL = FALSE; 
NotImpl: CommandProc =
BEGIN
inputLine: ROPE = Rope.FromRefText[session.inputLine];
ArpaSMTPSupport.Log[important, "Unimplemented command from ", session.sourceTxt, ": ", inputLine];
Reply[session.SMTPout, rc502];
END; -- end NotImpl
HELOcmd: CommandProc =
BEGIN
line: REF TEXT = session.inputLine;
last: INT _ session.lastScanned;
last _ SkipWhite[line, last];
[session.heloTxt, last] _ GetDomain[line, last];
NoArgsToEOL[line, last];
Reply[session.SMTPout, rc250, ArpaConfig.ourLocalName];
ArpaSMTPSupport.Log[verbose,
"Incoming SMTP conversation begun with ", session.sourceTxt,
" = ", ConvertExtras.RopeFromArpaAddress[session.source], "."];
session.cmdState _ ReadyState;
END; -- end HELOcmd
MAILcmd: CommandProc =
BEGIN
line: REF TEXT = session.inputLine;
last: INT _ session.lastScanned;
last _ SkipWhite[line, last];
last _ SkipWord[line, last, "FROM:"];
IF line.length = 12 AND RefText.Fetch[line, 11] = '> THEN { -- Yetch, hack for MAXC
ArpaSMTPSupport.Log[verbose,
 "\"MAIL FROM:<>\" from ", session.sourceTxt, ", fudging via Postmaster."];
session.reversePath _ Rope.Cat["Postmaster@", session.sourceTxt];
last _ 12; }
ELSE [session.reversePath, last] _ GetPath[line, last];
NoArgsToEOL[line, last];
session.recipients _ NIL;
Reply[session.SMTPout, rc250, "OK"];
session.cmdState _ RcptState;
END; -- end MAILcmd
RCPTcmd: CommandProc =
BEGIN
line: REF TEXT = session.inputLine;
last: INT _ session.lastScanned;
newRecipient: ROPE;
last _ SkipWhite[line, last];
last _ SkipWord[line, last, "TO:"];
[newRecipient, last] _ GetPath[line, last];
NoArgsToEOL[line, last];
session.recipients _ CONS[newRecipient, session.recipients];
Reply[session.SMTPout, rc250, "OK"];
session.cmdState _ DataState;
END; -- end RCPTcmd
DATAcmd: CommandProc =
BEGIN
ENABLE ArpaSMTPDescr.CreateFailed => {
ArpaSMTPSupport.Log[important,
"Failed to create descriptor for input from ",
session.sourceTxt, " = ", ConvertExtras.RopeFromArpaAddress[session.source],
". Rejecting request."];
Reply[session.SMTPout, rc452]; -- insuffient storage
session.cmdState _ ReadyState;
CONTINUE; -- i.e. RETURN
};

descr: ArpaSMTPDescr.Descr;
timeStampLine, returnPathLine: ROPE;
gvSender: ROPE _ ArpaSMTPSyntax.BlessReturnPath[session.reversePath];
NoArgsToEOL[session.inputLine, session.lastScanned];
ArpaSMTPQueue.StartNewMessage[session.sourceTxt];
Reply[session.SMTPout, rc354];
timeStampLine _ Rope.Cat["Received: from ", session.heloTxt];
IF ~Rope.Equal[session.heloTxt, session.sourceTxt, FALSE] THEN
timeStampLine _ Rope.Cat[timeStampLine, " (", session.sourceTxt, ")"];
timeStampLine _ Rope.Cat[timeStampLine, " by ", ArpaConfig.ourLocalName, " ;"];
timeStampLine _ Rope.Cat[timeStampLine, " ", ArpaSMTPSupport.Now[].rope];
returnPathLine _ Rope.Cat["Return-Path: <", session.reversePath, ">"];
descr _ ArpaSMTPDescr.Create[
arpaReversePath: session.reversePath,
gvSender: gvSender,
rawRecipients: session.recipients,
source: session.sourceTxt,
format: arpa,
msgStream: CreateMailDataStream[session.SMTPin],
precedeMsgText: timeStampLine,
returnPathLine: returnPathLine];
ArpaSMTPQueue.AddNewMessage[descr, session.sourceTxt];
ArpaSMTPSupport.Log[
noteworthy,
ArpaSMTPDescr.Unparse[descr], " accepted from ",
session.sourceTxt, "."];
Reply[session.SMTPout, rc250];
session.cmdState _ ReadyState;
END; -- end DATAcmd
RSETcmd: CommandProc =
BEGIN
NoArgsToEOL[session.inputLine, session.lastScanned];
Reply[session.SMTPout, rc250, "Reset to ready state"];
session.cmdState _ ReadyState;
END; -- end RSETcmd
NOOPcmd: CommandProc = 
BEGIN
NoArgsToEOL[session.inputLine, session.lastScanned];
Reply[session.SMTPout, rc250];
END; -- end NOOPcmd
QUITcmd: CommandProc =
BEGIN
NoArgsToEOL[session.inputLine, session.lastScanned];
IF session.cmdState = InitState OR session.cmdState = ReadyState THEN {
Reply[session.SMTPout, rc221];
ArpaSMTPSupport.Log[verbose,
 "Incoming SMTP conversation with ", session.sourceTxt, " ending."];
ERROR SMTPquit; -- proper session end
}
ELSE RSETcmd[session]; -- doc says to treat as RSET
END; -- end QUITcmd
CreateMailDataStream: PROC [stream: STREAM] RETURNS [STREAM] = {
RETURN[IO.CreateStream[streamProcs: SMTPfilteredMsgProcs,
 backingStream: stream,
 streamData: NEW[MDSdata _ []]]]; };
MDSdata: TYPE = RECORD [line: REF TEXT _ RefText.New[1001], ptr: INT _ 0];
SMTPfilteredMsgProcs: REF IO.StreamProcs ~ IO.CreateStreamProcs[variety~IO.StreamVariety[input], class~$MsgData, getChar~MDSgetChar];
MDSgetChar: PROC [self: STREAM] RETURNS [CHAR] = {
data: REF MDSdata ~ NARROW[self.streamData];
returnChar: CHAR;
IF data.ptr >= data.line.length THEN {
line: REF TEXT _ data.line;
full: BOOL;
line.length _ data.ptr _ 0;
BEGIN ENABLE IO.EndOfStream => ERROR ArpaSMTPDescr.CreateFailed;
[line, full] _ MyGetLine[self.backingStream, line];
IF self.backingStream.PeekChar[] = '\l THEN
[] _ self.backingStream.GetChar[]; -- LF
END;
IF ~ full THEN line _ RefText.InlineAppendChar[line, '\n];
data.line _ line;
IF (line.length = 2) AND (RefText.Fetch[line, 0] = '.)
 AND (RefText.Fetch[line, 1] = '\n) THEN {
ERROR IO.EndOfStream[self]; }; -- normal exit; end of mail data
IF RefText.Fetch[line, 0] = '. THEN data.ptr _ 1; -- remove . at beginning of line
};
returnChar _ RefText.Fetch[data.line, data.ptr];
data.ptr _ data.ptr + 1;
RETURN[returnChar];
}; -- end MDSgetChar

MyGetLine: PROC [stream: STREAM, buffer: REF TEXT] RETURNS [line: REF TEXT, full: BOOL] = {
buffer.length _ 0;
DO
char: CHAR _ IO.GetChar[stream ! IO.EndOfStream => IF buffer.length > 0 THEN EXIT ELSE REJECT];
IF char = '\n THEN RETURN[buffer, FALSE];
buffer _ RefText.InlineAppendChar[buffer, char];
IF buffer.length > 1000 THEN RETURN[buffer, TRUE];
ENDLOOP; };
ReadLine: PROC [InpStream: IO.STREAM, buffer: REF TEXT] ~ {
quit, include, anySeen, nextCharEscaped: BOOL _ FALSE;
buffer.length _ 0;
DO
char: CHAR ~ InpStream.GetChar[];
SELECT char FROM
'\\ => {include _ anySeen _ TRUE;
 nextCharEscaped _ ~nextCharEscaped};
'\n => {IF nextCharEscaped THEN
 include _ TRUE
 ELSE {
 IF InpStream.PeekChar[] # '\l THEN
 ERROR SMTPerror[rc501, "CR must be followed by LF"];
 [] _ InpStream.GetChar[]; -- Read LF
 include _ FALSE;
 quit _ anySeen;
 };
 nextCharEscaped _ FALSE};
ENDCASE => {include _ anySeen _ TRUE;
 nextCharEscaped _ FALSE};
IF include THEN buffer _ RefText.InlineAppendChar[buffer, char];
IF quit THEN EXIT;
ENDLOOP;
}; -- end ReadLine
SkipWord: PROC [inputLine: REF TEXT, last: INT, word: REF TEXT] RETURNS [INT] ~ {
IF last+1 # RefText.Find[inputLine, word, last+1, FALSE] THEN
ERROR SMTPerror[rc501]; -- bad parms
last _ last + word.length;
RETURN[last];
}; -- end SkipWord
SkipWhite: PROC [inputLine: REF TEXT, last: INT] RETURNS [INT] ~ {
RETURN[RefText.SkipOver[inputLine, last+1, " \t"] - 1]; };
GetPath: PROC [inputLine: REF TEXT, last: INT] RETURNS [ROPE, INT] ~ {
start: INT ~ last+1;
last _ CheckPath[inputLine, last];
RETURN[MakeRope[inputLine, start+1, last-1], last]; }; -- Prune <>
GetDomain: PROC [inputLine: REF TEXT, last: INT] RETURNS [ROPE, INT] ~ {
start: INT ~ last+1;
last _ CheckDomain[inputLine, last];
RETURN[MakeRope[inputLine, start, last], last]; };
GetString: PROC [inputLine: REF TEXT, last: INT] RETURNS [ROPE, INT] ~ {
start: INT ~ last+1;
last _ CheckString[inputLine, last];
RETURN[MakeRope[inputLine, start, last], last]; };
NoArgsToEOL: PROC [inputLine: REF TEXT, last: INT] ~ {
last _ SkipWhite[inputLine, last];
IF last < inputLine.length-1 THEN ERROR SyntaxErr[last]; };
MakeRope: PROC [buffer: REF TEXT, start, last: INT] RETURNS [ROPE] ~ {
len: INT _ last+1-start;
new: Rope.Text _ Rope.NewText[len];
FOR i: INT IN [0..len) DO new[i] _ buffer[start+i]; ENDLOOP;
RETURN[new]; };
Enum: TYPE ~ {aChar, cChar, dChar, qChar, xChar};
Bounds: ERROR ~ RuntimeError.BoundsFault;
FetchIt: PROC [self: REF TEXT, i: INT] RETURNS [CHAR] = {
RETURN[RefText.Fetch[self, i]]; }; -- Inlines don't like ! Bounds =>
Fetch: PROC [self: REF TEXT, i: INT] RETURNS [CHAR] = {
RETURN[FetchIt[self, i ! Bounds => ERROR SyntaxErr[self.length-1]]]};
CheckPath: PROC [path: REF TEXT, last: INT] RETURNS [INT] ~ {
IF Fetch[path, last _ last+1] # '< THEN ERROR SyntaxErr[last];
WHILE Fetch[path, last+1] = '@ DO
last _ last + 1;
last _ CheckDomain[path, last];
last _ last + 1;
IF Fetch[path, last] = ': THEN EXIT;
IF Fetch[path, last] # ', THEN ERROR SyntaxErr[last];
IF Fetch[path, last+1] # '@ THEN ERROR SyntaxErr[last+1];
ENDLOOP;
last _ CheckMailbox[path, last];
IF Fetch[path, last _ last+1] # '> THEN ERROR SyntaxErr[last];
RETURN[last];
}; -- end CheckPath
CheckMailbox: PROC [mbox: REF TEXT, last: INT] RETURNS [INT] ~ {
IF Fetch[mbox, last+1] = '" THEN { -- quoted-string
last _ last+1;
IF Fetch[mbox, last+1] = '" THEN ERROR SyntaxErr[last+1];
DO
IF Fetch[mbox, last _ last+1] = '\\ --SyntaxErr if Bounds: should at least be a "-- THEN
{IF ~CharIs[Fetch[mbox, last _ last+1], xChar] THEN ERROR SyntaxErr[last]}
ELSE
{IF ~CharIs[Fetch[mbox, last], qChar] THEN ERROR SyntaxErr[last]};
IF Fetch[mbox, last+1] = '" THEN {last _ last+1; EXIT};
ENDLOOP;
}
ELSE { -- dot-string
DO
last _ CheckString[mbox, last];
IF Fetch[mbox, last+1] # '. THEN EXIT; -- normal dot-string exit
last _ last+1;
ENDLOOP; };
IF Fetch[mbox, last _ last+1] # '@ THEN ERROR SyntaxErr[last];
last _ CheckDomain[mbox, last];
RETURN[last];
}; -- end CheckMailbox
CheckDomain: PROC [domain: REF TEXT, last: INT] RETURNS [INT] ~ {
DO -- read an element, and repeat if it is followed by a "." (and another element)
c: CHAR = Fetch[domain, last+1];
SELECT c FROM
'# => last _ CheckNumber[domain, last+1];
'[ => {
last _ CheckDotnum[domain, last+1];
IF Fetch[domain, last _ last+1] # '] THEN ERROR SyntaxErr[last]; };
ENDCASE => last _ CheckName[domain, last];
IF FetchIt[domain, last+1 ! Bounds => EXIT] # '. THEN EXIT; -- normal exit
last _ last+1;
ENDLOOP;
RETURN[last];
}; -- end CheckDomain
CheckNumber: PROC [num: REF TEXT, last: INT] RETURNS [INT] ~ {
last _ last + 1;
IF ~CharIs[FetchIt[num, last], dChar] THEN SyntaxErr[last];
DO
IF ~CharIs[FetchIt[num, last+1 ! Bounds => EXIT], dChar] THEN EXIT;
last _ last + 1;
ENDLOOP;
RETURN[last];
}; -- end CheckNumber
CheckDotnum: PROC [dotn: REF TEXT, last: INT] RETURNS [INT] ~ {
last _ CheckSnum[dotn, last];
THROUGH [0..3) DO
IF Fetch[dotn, last _ last+1] # '. THEN ERROR SyntaxErr[last];
last _ CheckSnum[dotn, last];
ENDLOOP;
RETURN[last];
}; -- end CheckDotnum
CheckName: PROC [name: REF TEXT, last: INT] RETURNS [INT] ~ {
validName: BOOL _ TRUE;
c: CHAR _ Fetch[name, last _ last+1];
IF ~CharIs[c, aChar] THEN ERROR SyntaxErr[last];
DO
c _ FetchIt[name, (last _ last+1) ! Bounds => EXIT];
IF ~(c = '- OR CharIs[c, aChar] OR CharIs[c, dChar]) THEN EXIT;
ENDLOOP;
IF c = '- THEN ERROR SyntaxErr[last];
last _ last-1;
RETURN[last];
}; -- end CheckName
CheckSnum: PROC [snum: REF TEXT, last: INT] RETURNS [INT] ~ {
start: INT ~ last+1;
val: INT _ 0;
last _ CheckNumber[snum, last]; -- assuming an snum is never followed by a digit
FOR i: INT IN [start..last] DO val _ (10*val) + (Fetch[snum, i]-'0) ENDLOOP;
IF val > 255 THEN ERROR SyntaxErr[last];
RETURN[last]; };
CheckString: PROC [str: REF TEXT, last: INT] RETURNS [INT] ~ {
start: INT = last;
last _ last + 1;
DO
IF FetchIt[str, last ! Bounds => EXIT] = '\\ THEN {
last _ last + 2;
IF ~CharIs[Fetch[str, last], xChar] THEN ERROR SyntaxErr[last]}
ELSE {
IF ~CharIs[Fetch[str,  last+1], cChar] THEN EXIT;
last _ last + 1; };
ENDLOOP;
IF last = start THEN ERROR SyntaxErr[last+1]; -- nothing read
RETURN[last]; };
CharIs: PROC [c: CHAR, t: Enum] RETURNS [BOOL] = {
subType: TYPE = {alpha, digit, space, crlf, quoteSlosh, subSpecial, others};
cSubType: subType _ SELECT c FROM
IN['a..'z], IN['A..'Z] => alpha,
IN['0..'9] => digit,
' --sp-- => space,
'\n, '\l => crlf,
'", '\\ => quoteSlosh,
'<, '>, '(, '), '[, '], '., ',, ';, ':, '@, '\177 --127--,
 IN['\000..'\012), IN('\012..'\015), IN('\015..'\034] --0..31 less LF and CR--
 => subSpecial, -- special = crlf + quoteSlosh + subSpecial
ENDCASE => others; -- Cedar chars include only the 128 ASCII chars
RETURN[SELECT t FROM
aChar => cSubType = alpha,
cChar => cSubType = alpha OR cSubType = digit OR cSubType = others,
dChar => cSubType = digit,
qChar => cSubType # crlf AND cSubType # quoteSlosh,
xChar => TRUE,
ENDCASE => ERROR]
};
SessionRec: TYPE ~ RECORD [
SMTPin, SMTPout: IO.STREAM,
cmdState: CommandState _ InitState,
inputLine: REF TEXT _ RefText.New[512],
lastScanned: INT _ -1,
source: Arpa.Address _ Arpa.nullAddress,
sourceTxt: ROPE _ NIL,
heloTxt: ROPE _ NIL,
reversePath: ROPE _ NIL,
recipients: LIST OF ROPE _ NIL];
SyntaxErr: ERROR [where: INT _ -1, reason: ROPE _ NIL] = CODE;
SMTPerror: ERROR [rc: RC, reason: ROPE _ NIL] = CODE;
SMTPquit: ERROR = CODE;
NewSession: PROC [stream: STREAM, source: Arpa.Address] =
BEGIN
session: REF SessionRec ~ NEW[SessionRec _ [stream, stream]];
BEGIN
ENABLE {
ArpaTCP.Timeout => {
ArpaSMTPSupport.Log[
noteworthy, 
"ArpaTCP.Timeout from ", 
session.sourceTxt, 
" = ", ConvertExtras.RopeFromArpaAddress[source], "."];
GOTO Kill; };
IO.Error => {
ArpaSMTPSupport.Log[
noteworthy,
"IO.Error from ",
session.sourceTxt,
" = ", ConvertExtras.RopeFromArpaAddress[source], ": ",
SELECT ArpaTCP.ErrorFromStream[stream] FROM
neverOpen => "never open",
localClose => "local close",
localAbort => "local abort",
remoteClose => "remote close",
remoteAbort => "remote abort",
transmissionTimeout => "transmission timeout",
protocolViolation => "protocol violation",
ENDCASE => "???",
"."];
GOTO Kill; };
IO.EndOfStream => {
ArpaSMTPSupport.Log[
noteworthy,
"IO.EndOfStream from ", session.sourceTxt,
" = ", ConvertExtras.RopeFromArpaAddress[source], ": ",
SELECT ArpaTCP.ErrorFromStream[stream] FROM
neverOpen => "never open",
localClose => "local close",
localAbort => "local abort",
remoteClose => "remote close",
remoteAbort => "remote abort",
transmissionTimeout => "transmission timeout",
protocolViolation => "protocol violation",
ENDCASE => "???",
"."];
GOTO Kill; };
};

cmdName: ROPE;
cmd: CMD;
session.source _ source;
session.sourceTxt _ ConvertExtras.RopeFromArpaAddress[session.source];
ArpaSMTPSupport.Log[verbose,
 "Start of SMTP connection from ", session.sourceTxt, "."];
Reply[stream, rc220];
DO -- sit in a loop parsing command names, checking they are allowed, and execing them
ENABLE {
SMTPerror => {Reply[stream, rc, reason]; CONTINUE};
SyntaxErr => {
input: ROPE _ Rope.FromRefText[session.inputLine];
IF where < 0 THEN
Reply[stream, rc501, 
 "Syntax error", IF Rope.IsEmpty[reason] THEN NIL ELSE ", ", reason]
ELSE
Reply[stream, rc501, 
 "Syntax error",
 IF Rope.IsEmpty[reason] THEN NIL ELSE ", ", reason,
 " - \"", Rope.Substr[input, 0, where], "<!>", Rope.Substr[input, where], "\""];
CONTINUE};
SMTPquit => {stream.Close[]; EXIT}; -- proper session end
};

ReadLine[stream, session.inputLine];
[cmdName, session.lastScanned] _ GetString[session.inputLine, -1];
FOR cmd IN CMD DO
IF Rope.Equal[Commands[cmd].name, cmdName, FALSE] THEN EXIT;
REPEAT
FINISHED => {
reason: ROPE = Rope.Cat["Unrecognized command: ", cmdName];
ERROR SMTPerror[rc500, reason]; }; -- command not found
ENDLOOP;
IF ~session.cmdState^[cmd] THEN ERROR SMTPerror[rc503]; -- commands out of order
(Commands[cmd].Action)[session];
ENDLOOP;
EXITS Kill => ArpaTCP.AbortTCPStream[stream];
END;
END;
Filter: PROC [from: Arpa.Address] =
BEGIN
ok: BOOL; whyNot: ROPE;
[ok, whyNot] _ ArpaSMTPControl.OKToAcceptSMTPInput[];
IF ~ok THEN {
ArpaSMTPSupport.Log[important, "SMTP input request rejected: ", whyNot, "."];
ERROR RejectThisRequest; };
ArpaSMTPQueue.StartNewMessage["Check ML Early"];
END;
inputListener: PROCESS _ NIL;
listenerInOperation: BOOL _ FALSE;
Error: PUBLIC ERROR [reason: ROPE] = CODE;
Initialize: PUBLIC PROC = {
IF listenerInOperation THEN ERROR Error["SMTP listener already in operation."];
inputListener _ CreateTCPStreamListener[
local: ArpaSMTPControl.arpaMSPort,
proc: NewSession,
timeout: LONG[24]*60*60000, -- 1 day(!). Sometimes throughput is as low as 30 bps to UK sites
filter: Filter];
ArpaSMTPSupport.Log[important, "SMTP/TCP-Stream listener started."];
listenerInOperation _ TRUE; };
Finalize: PUBLIC PROC ~ {
IF ~listenerInOperation THEN ERROR Error["No SMTP listener in operation."];
DestroyTCPListener[inputListener];
ArpaSMTPSupport.Log[important, "SMTP listener destroyed."];
listenerInOperation _ FALSE; };
CreateTCPStreamListener: PROC [local: ArpaTCP.DByte, proc: PROC [STREAM, Arpa.Address],
 timeout: INT --msecs--, filter: PROC [Arpa.Address]]
 RETURNS [handle: PROCESS] ~ {
smtpTCPInfo: ArpaTCP.TCPInfo ~ [matchLocalPort~TRUE, localPort~local,
 active~FALSE, -- i.e. listener
 timeout~timeout,
 matchForeignAddr~FALSE, matchForeignPort~FALSE];
TRUSTED {Process.Detach[handle _ FORK TCPStreamListener[proc, filter, smtpTCPInfo]]};
}; -- end CreateTCPStreamListener
TCPStreamListener: PROC [proc: PROC [STREAM, Arpa.Address], filter: PROC [Arpa.Address], smtpTCPInfo: ArpaTCP.TCPInfo] ~ {
DO
ENABLE ArpaTCP.Error => {
ArpaSMTPSupport.Log[CRITICAL,
 "TCP stream listener unable to \"open\" stream for SMTP reception, ",
 IF reason = localConflict THEN "local conflict"
 ELSE "unspecified remote end",
 ".\nIt is possibly a program bug.\n",
 "Will try again later, though intervention is probably required."];
RETRY;
};
tcpStream: STREAM = ArpaTCP.CreateTCPStream[smtpTCPInfo];
remote: Arpa.Address;
ArpaTCP.WaitForListenerOpen[tcpStream];
remote _ ArpaTCP.GetRemoteSocket[tcpStream].addr;
filter[remote ! RejectThisRequest => {ArpaTCP.AbortTCPStream[tcpStream]; LOOP}];
TRUSTED {Process.Detach[FORK proc[tcpStream, remote]]};
ENDLOOP;
}; -- end TCPStreamListener
RejectThisRequest: ERROR ~ CODE;
DestroyTCPListener: PROC [listener: PROCESS] ~ {
TRUSTED {Process.Abort[listener]};
};
END. -- SMTPRcvrImpl
dArpaSMTPRcvrImpl.mesa
Copyright c 1985 by Xerox Corporation.  All rights reserved.
Last Edited by: HGM, December 9, 1984 1:43:02 am PST
Last Edited by: DCraft, December 14, 1983 5:18 pm
Last Edited by: Taft, January 23, 1984 2:18:03 pm PST
Hal Murray July 2, 1985 1:33:31 am PDT
John Larson, August 10, 1988 1:09:19 pm PDT

ArpaName USING [AddressToName],
Reply codes
Commands available
The command order is restricted according to the current CommandState, which is a boolean array indicating which commands are allowed next. The current state is changed by commands which move the machinery through the FSM. This "stack frame" is only one deep because there can be no nested command sequences (though a few single commands which do not affect the state may occur at any time). The values are recorded here so that command additions/ changes/ deletions (which will affect all CmdRestr values) are in one place. Commands out of sequence are defined not to affect the state.
command successors: HE MA RC DA RS SE SO SA VR EX HE NO QU TU
possibly, this should be checked for validity before responding; currently just compose failure message later
-- discard sender, recipients, and mail data, and clear buffers
Mail Data Stream
To read mail data, the SMTP input stream is overlayed with a stream which signals EndOfStream when it encounters a line consisting of a single period, and strips periods from the front of the line which were added for transparency.
Would you believe that somebody sent us a line that was longer than 32K?
Command Line & Parameter decoding
The strategy is first to read a line into a TEXT buffer and then pick a command and parameters out of it using the Skip- and Get- procs.
Throughout this area, last is the last character that has ALREADY been processed. I think it started out to be 1 different, but that got tangled up with a bounds fault that was off by 2.
"- 1" since SkipOver returns "next"
The following parameter decoding procedures implement the pictured syntax diagrams, which were derived from the BNF productions for SMTP.  Notation: (terminals), [non-terminals].

                    --------------------------
                   |                          v
    path:  --->(<)---->(@)--->[domain]--->(:)--->[mailbox]--->(>)--->
                    ^                  |
                     -------(,)<-------


                        --------------
                       v              |
  mailbox:  ------>(")---->(\)-->[x]---->(")------>(@)--->[domain]--->
              |         |            ^          ^
              |          ---->[q]----           |
              |                                 |
               ----------->[string]-------------
                        ^            |
                         -----(.)----


              -------------(.)<------------
             v                             |                   ------
  domain:  -------------->[name]-------------->               v      |
               |                         ^         number:  ---->[d]---->
               |---->(#)-->[number]----->|
               |                         |
                -->([)-->[dotnum]-->(])--


  dotnum:  --->[snum]-->(.)-->[snum]-->(.)-->[snum]-->(.)-->[snum]--->


                  -------------
                 v             |                            --------------
  name:  --->[a]------>[a]---------->[a]----->             v              |
                   |         ^   |        ^      string:  ------->[c]------->
                   |-->[d]-->|    -->[d]--                  |            ^
                   |         |                               ->(\)-->[x]-
                    -->(-)---


 where <a>       is [a..z], [A..Z]
       <c>       is <x> except <special> or <SP>
       <d>       is [0..9]
       <q>       is <x> except <CR>, <LF>, ", or \
       <x>       is any of the 128 ASCII chars
       <special> is one of <>()[]\.,;:@" or ASCII 0 through 31
       <snum>    is 1, 2, or 3 digits representing a decimal integer in the range 0 through 255
simply turns Bounds into SyntaxErr
Sessions (with this host as receiver)
nameRope: ROPE _ NIL;
nameRope _ ArpaName.AddressToName[source, ArpaConfig.resolv^].name;
IF ~Rope.IsEmpty[nameRope] THEN  session.sourceTxt _  nameRope
ELSE session.sourceTxt _ ConvertExtras.RopeFromArpaAddress[session.source];
Provides an interface similar to PupStream.CreatePupByteStreamListener. WARNING: The remote addresses to both proc and filter are null because the TCP listener doesn't provide that info.
wait 15 mins
Abort stream since close might hang because of unread data. Should seldom reject.
Provides an interface similar to PupStream.DestroyPupListener.
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