[Oberon] File transfer; was, "all in one git tree"

[peter at easthope.ca]

Hi,

From:	=?utf-8?Q?J=C3=B6rg_Straube?= <joerg.straube at iaeth.ch>
Date:	Thu, 31 Dec 2020 12:52:51 +0100
> I transfer file to and from Oberon with tftp (RFC1350, tftp client 
> on OberonOS, tftp server on other side).

TFTP client and server were also implemented in A2 by "be".
 
Modules TFTP.Mod (373 lines) and Oberon.TFTPTool.Mod (51 lines) are 
visible. 
https://en.wikibooks.org/wiki/Oberon/A2#Sources,_Tools_and_Configuration_Texts_in_A2 

TFTP.Mod has "IMPORT IP, UDP, Files, Random, KernelLog;"

Random is used to find a vacant port.
	generator: Random.Generator;
	...
			REPEAT
				INC(retries); lport := 1024 + generator.Integer() MOD 64512;
				NEW(socket, lport, res)
			UNTIL (res # UDP.PortInUse) OR (retries > MaxSocketRetries);
			
According to 
https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
port 69 is assigned to TFTP.  Why not use it?

An incremental search might be acceptable.

			(* Find a vacant ephemeral port. *)
			lport := 60000;
			topPort := lport + MaxSocketTries;
			(* Top ephemeral port is 64738.  I don't understand the origin of 64512. *)
			IF topPort > 64738 THEN topPort := 64738 END;
			NEW(socket, lport, res);
			WHILE(res = UDP.PortInUse) & (lport < topPort) DO
				INC(lport);
				NEW(socket, lport, res)
			END; 

A FPGA board connects to the server by a serial crossover cable.
Analogously for an emulated V5 machine.

In linux at least, a server is readily available.
https://wiki.debian.org/TFTP

Regards,                                   ... P. L.


-- 
Tel: +1 604 670 0140            Bcc: peter at easthope. ca