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Net.Mod
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Net.Mod
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MODULE Net; (*NW 3.7.88 / 25.8.91 / PR 7.8.13 / 9.12.13*)
IMPORT SYSTEM, SCC, Files, Viewers, Texts, TextFrames, MenuViewers, Oberon;
CONST PakSize = 512;
(*T0 = 300; T1 = 1000; (*timeouts*)*)
T0 = 1000; T1 = 3000; (*timeouts*)
ACK = 10H; NAK = 25H; NPR = 26H; (*acknowledgements*)
NRQ = 34H; NRS = 35H; (*name request, response*)
SND = 41H; REC = 42H; MSG = 44H;
TRQ = 46H; TIM = 47H; (*time requests*)
VAR W: Texts.Writer;
Server: Oberon.Task;
head0, head1: SCC.Header;
partner: ARRAY 8 OF CHAR;
dmy: ARRAY 8 OF BYTE;
protected: BOOLEAN; (*write-protection*)
PROCEDURE SetPartner(name: ARRAY OF CHAR);
BEGIN head0.dadr := head1.sadr; partner := name
END SetPartner;
PROCEDURE Send(t: BYTE; L: INTEGER; data: ARRAY OF BYTE);
BEGIN head0.typ := t; head0.len := L; SCC.SendPacket(head0, data)
END Send;
PROCEDURE ReceiveHead(timeout: LONGINT);
VAR time: LONGINT;
BEGIN time := Oberon.Time() + timeout;
REPEAT
SCC.ReceiveHead(head1);
IF head1.valid & (head1.sadr # head0.dadr) THEN
SCC.Skip(head1.len); head1.valid := FALSE
END;
IF ~head1.valid & (Oberon.Time() >= time) THEN head1.typ := 0FFH END
UNTIL head1.valid OR (head1.typ = 0FFH)
END ReceiveHead;
PROCEDURE FindPartner(name: ARRAY OF CHAR; VAR res: INTEGER);
VAR time: LONGINT; k: INTEGER;
Id: ARRAY 8 OF CHAR; IdB: ARRAY 8 OF BYTE;
BEGIN SCC.Skip(SCC.Available()); res := 0; k := 0;
WHILE (k < 7) & (name[k] # 0X) DO Id[k] := name[k]; IdB[k] := ORD(Id[k]); INC(k) END;
Id[k] := 0X; IdB[k] := 0; (* <-- also terminate IdB *)
IF Id # partner THEN
head0.dadr := 0FFH; Send(NRQ, k+1, IdB); time := Oberon.Time() + T1;
REPEAT
SCC.ReceiveHead(head1);
IF head1.valid THEN
IF head1.typ = NRS THEN SetPartner(Id)
ELSE SCC.Skip(head1.len); head1.valid := FALSE
END
ELSIF Oberon.Time() >= time THEN res := 1; partner[0] := 0X
END
UNTIL head1.valid OR (res # 0)
END
END FindPartner;
PROCEDURE AppendS(s: ARRAY OF CHAR; VAR d: ARRAY OF BYTE; VAR k: INTEGER);
VAR i: INTEGER; ch: CHAR;
BEGIN i := 0;
REPEAT ch := s[i]; d[k] := ORD(ch); INC(i); INC(k) UNTIL ch = 0X
END AppendS;
PROCEDURE AppendW(s: LONGINT; VAR d: ARRAY OF BYTE;
n: INTEGER; VAR k: INTEGER);
VAR i: INTEGER;
BEGIN i := 0;
REPEAT d[k] := s MOD 100H; s := s DIV 100H; INC(i); INC(k) UNTIL i = n
END AppendW;
PROCEDURE PickS(VAR s: ARRAY OF CHAR);
VAR i: INTEGER; x: BYTE;
BEGIN i := 0;
REPEAT SCC.Receive(x); s[i] := CHR(x); INC(i) UNTIL x = 0
END PickS;
PROCEDURE PickQ(VAR w: LONGINT);
VAR x0, x1, x2, x3: BYTE;
BEGIN SCC.Receive(x0); SCC.Receive(x1); SCC.Receive(x2); SCC.Receive(x3);
w := x0 + 100H * (x1 + 100H * (x2 + 100H * x3))
END PickQ;
PROCEDURE SendData(F: Files.File);
VAR k, seqno: INTEGER;
x: BYTE;
len: LONGINT;
R: Files.Rider;
buf: ARRAY PakSize OF BYTE;
BEGIN Files.Set(R, F, 0); len := 0; seqno := 0;
REPEAT k := 0;
REPEAT Files.ReadByte(R, x);
IF ~R.eof THEN buf[k] := x; INC(k) END
UNTIL R.eof OR (k = PakSize);
REPEAT Send(seqno, k, buf); ReceiveHead(T1)
UNTIL head1.typ # seqno + ACK;
seqno := (seqno + 1) MOD 8; len := len + k;
IF head1.typ # seqno + ACK THEN
Texts.WriteString(W, " failed"); k := 0
END
UNTIL k < PakSize;
Texts.WriteInt(W, len, 7)
END SendData;
PROCEDURE ReceiveData(F: Files.File; VAR done: BOOLEAN);
VAR k, retry, seqno: INTEGER;
x: BYTE;
len: LONGINT;
R: Files.Rider;
BEGIN Files.Set(R, F, 0); seqno := 0; len := 0; retry := 2; k := PakSize;
REPEAT
IF head1.typ = seqno THEN
seqno := (seqno + 1) MOD 8; len := len + head1.len; retry := 2;
Send(seqno + ACK, 0, dmy); k := 0;
WHILE k < head1.len DO
SCC.Receive(x); Files.WriteByte(R, x); INC(k)
END ;
IF k < PakSize THEN done := TRUE END
ELSE DEC(retry);
IF retry = 0 THEN
Texts.WriteString(W, " failed"); done := FALSE; k := 0
END ;
Send(seqno + ACK, 0, dmy)
END ;
ReceiveHead(T0)
UNTIL k < PakSize;
Texts.WriteInt(W, len, 7)
END ReceiveData;
PROCEDURE reply(msg: INTEGER);
BEGIN
IF msg = 1 THEN Texts.WriteString(W, " no link")
ELSIF msg = 2 THEN Texts.WriteString(W, " no permission")
ELSIF msg = 3 THEN Texts.WriteString(W, " not done")
ELSIF msg = 4 THEN Texts.WriteString(W, " not found")
ELSIF msg = 5 THEN Texts.WriteString(W, " no response")
ELSIF msg = 6 THEN Texts.WriteString(W, " time set")
END ;
Texts.WriteLn(W); Texts.Append(Oberon.Log, W.buf)
END reply;
PROCEDURE Serve;
VAR i: INTEGER;
done: BOOLEAN; x: BYTE;
F: Files.File;
pw, clock, newclock: LONGINT;
Id: ARRAY 8 OF CHAR;
IdB: ARRAY 8 OF BYTE;
FileName: ARRAY 32 OF CHAR;
BEGIN
SCC.ReceiveHead(head1);
IF head1.valid THEN
IF head1.typ = SND THEN
PickS(Id); PickQ(pw); PickS(FileName);
Texts.WriteString(W, Id); Texts.Write(W, " ");
Texts.WriteString(W, FileName);
F := Files.Old(FileName);
IF F # NIL THEN
Texts.WriteString(W, " sending"); SetPartner(Id);
Texts.Append(Oberon.Log, W.buf); SendData(F)
ELSE Send(NAK, 0, dmy); Texts.Write(W, "~")
END ;
reply(0)
ELSIF head1.typ = REC THEN
PickS(Id); PickQ(pw); PickS(FileName);
IF ~protected THEN
Texts.WriteString(W, Id); Texts.Write(W, " ");
Texts.WriteString(W, FileName);
F := Files.New(FileName);
IF F # NIL THEN
Texts.WriteString(W, " receiving"); SetPartner(Id);
Texts.Append(Oberon.Log, W.buf);
Send(ACK, 0, dmy); ReceiveHead(T0); ReceiveData(F, done);
IF done THEN Files.Register(F) END
ELSE Send(NAK, 0, dmy); Texts.Write(W, "~")
END ;
reply(0)
ELSE Send(NPR, 0, dmy)
END
ELSIF head1.typ = MSG THEN i := 0;
WHILE i < head1.len DO SCC.Receive(x); Texts.Write(W, CHR(x));
INC(i) END ;
Send(ACK, 0, dmy); reply(0)
ELSIF head1.typ = TRQ THEN
i := 0; AppendW(Oberon.Clock(), IdB, 4, i); Send(TIM, 4, IdB)
ELSIF head1.typ = TIM THEN PickQ(newclock); PickS(Id); PickQ(pw);
clock := Oberon.Clock();
IF ~protected & (Id[0] # 0X) & (ABS(pw - clock) > 10) THEN
Oberon.SetClock(newclock);
Texts.WriteString(W, Id); Texts.WriteString(W, " changed
System.Date");
Texts.WriteClock(W, newclock); reply(0)
END
ELSIF head1.typ = NRQ THEN
i := 0;
REPEAT SCC.Receive(x); Id[i] := CHR(x); INC(i);
IF i = 7 THEN Id[7] := 0X; x := 0 END
UNTIL x = 0;
WHILE i < head1.len DO SCC.Receive(x); INC(i) END ;
IF Id = Oberon.User THEN
SetPartner(Id); Send(NRS, 0, dmy)
END
ELSE SCC.Skip(head1.len)
END
END
END Serve;
PROCEDURE GetPar1(VAR S: Texts.Scanner);
BEGIN Texts.OpenScanner(S, Oberon.Par.text, Oberon.Par.pos); Texts.Scan(S)
END GetPar1;
PROCEDURE GetPar(VAR S: Texts.Scanner; VAR end: LONGINT);
VAR T: Texts.Text; beg, tm: LONGINT;
BEGIN Texts.Scan(S);
IF (S.class = Texts.Char) & (S.c = "^") THEN
Oberon.GetSelection(T, beg, end, tm);
IF tm >= 0 THEN Texts.OpenScanner(S, T, beg); Texts.Scan(S) END
ELSE end := Oberon.Par.text.len
END
END GetPar;
PROCEDURE SendFiles*;
VAR k: INTEGER;
end: LONGINT;
S: Texts.Scanner;
F: Files.File;
buf: ARRAY 64 OF BYTE;
BEGIN GetPar1(S);
IF S.class = Texts.Name THEN
FindPartner(S.s, k);
IF k = 0 THEN
GetPar(S, end);
WHILE (Texts.Pos(S) < end) & (S.class = Texts.Name) DO
Texts.WriteString(W, S.s); k := 0;
AppendS(Oberon.User, buf, k); AppendW(Oberon.Password, buf, 4, k);
AppendS(S.s, buf, k);
IF S.nextCh = ":" THEN (*prefix*)
Texts.Scan(S); Texts.Scan(S);
IF S.class = Texts.Name THEN
buf[k-1] := ORD("."); AppendS(S.s, buf, k);
Texts.Write(W, ":"); Texts.WriteString(W, S.s)
END
END ;
F := Files.Old(S.s);
IF F # NIL THEN
Send(REC, k, buf); ReceiveHead(T0);
IF head1.typ = ACK THEN
Texts.WriteString(W, " sending"); Texts.Append(Oberon.Log,
W.buf);
SendData(F); reply(0)
ELSIF head1.typ = NPR THEN reply(2); end := 0
ELSIF head1.typ = NAK THEN reply(3); end := 0
ELSE reply(5); end := 0
END
ELSE reply(4)
END ;
Texts.Scan(S)
END
ELSE reply(1)
END
END
END SendFiles;
PROCEDURE ReceiveFiles*;
VAR k: INTEGER; done: BOOLEAN;
end: LONGINT;
S: Texts.Scanner;
F: Files.File;
buf: ARRAY 64 OF BYTE;
BEGIN GetPar1(S);
IF S.class = Texts.Name THEN
FindPartner(S.s, k);
IF k = 0 THEN
GetPar(S, end);
WHILE (Texts.Pos(S) < end) & (S.class = Texts.Name) DO
Texts.WriteString(W, S.s);
k := 0; AppendS(Oberon.User, buf, k); AppendW(Oberon.Password,
buf, 4, k);
AppendS(S.s, buf, k);
IF S.nextCh = ":" THEN (*prefix*)
Texts.Scan(S); Texts.Scan(S);
IF S.class = Texts.Name THEN
buf[k-1] := ORD("."); AppendS(S.s, buf, k);
Texts.Write(W, ":"); Texts.WriteString(W, S.s)
END
END ;
Send(SND, k, buf);
Texts.WriteString(W, " receiving"); Texts.Append(Oberon.Log,
W.buf);
ReceiveHead(T1);
IF head1.typ = 0 THEN
F := Files.New(S.s);
IF F # NIL THEN
ReceiveData(F, done);
IF done THEN Files.Register(F); reply(0) ELSE end := 0 END
ELSE reply(3); Send(NAK, 0, dmy)
END
ELSIF head1.typ = NAK THEN reply(4)
ELSIF head1.typ = NPR THEN reply(2); end := 0
ELSE reply(5); end := 0
END ;
Texts.Scan(S)
END
ELSE reply(1)
END
END
END ReceiveFiles;
PROCEDURE SendMsg*;
VAR i: INTEGER; ch: CHAR;
S: Texts.Scanner;
msg: ARRAY 64 OF BYTE;
BEGIN GetPar1(S);
IF S.class = Texts.Name THEN
FindPartner(S.s, i);
IF i = 0 THEN
Texts.Read(S, ch);
WHILE (ch >= " ") & (i < 64) DO
msg[i] := ORD(ch); INC(i); Texts.Read(S, ch)
END ;
Send(MSG, i, msg); ReceiveHead(T0);
IF head1.typ # ACK THEN reply(3) END
ELSE reply(1)
END
END
END SendMsg;
PROCEDURE GetTime*;
VAR dt, res: INTEGER;
S: Texts.Scanner;
BEGIN GetPar1(S);
IF S.class = Texts.Name THEN
FindPartner(S.s, res);
IF res = 0 THEN
Send(TRQ, 0, dmy); ReceiveHead(T1);
IF head1.typ = TIM THEN
PickQ(dt); Oberon.SetClock(dt); reply(6)
END
ELSE reply(1)
END
END
END GetTime;
PROCEDURE StartServer*;
BEGIN protected := TRUE; partner[0] := 0X; SCC.Start(TRUE);
Oberon.Remove(Server); Oberon.Install(Server);
Texts.WriteString(W, " Server started as "); Texts.WriteString(W,
Oberon.User);
Texts.WriteLn(W); Texts.Append(Oberon.Log, W.buf)
END StartServer;
PROCEDURE Unprotect*;
BEGIN protected := FALSE
END Unprotect;
PROCEDURE WProtect*;
BEGIN protected := TRUE
END WProtect;
PROCEDURE Reset*;
BEGIN SCC.Start(TRUE)
END Reset;
PROCEDURE StopServer*;
BEGIN Oberon.Remove(Server); Texts.WriteString(W, " Server stopped");
Texts.WriteLn(W); Texts.Append(Oberon.Log, W.buf)
END StopServer;
PROCEDURE SCCStatus*;
BEGIN
Texts.WriteString(W, "SCC.Available() ");
Texts.WriteInt(W, SCC.Available(), 1);
Texts.WriteLn(W);
Texts.Append(Oberon.Log, W.buf)
END SCCStatus;
BEGIN Texts.OpenWriter(W); Server := Oberon.NewTask(Serve, 500)
END Net.