My Squeezebox Boom displays are dying.
In my quest for a replacement I'm experimenting with an Ocean Digital
WR-230S. If I make substantial progress, I'll start a thread on that.
For the moment, I'm just trying to get it to talk to LMS at all. And,
sadly, that means UPnP.
The Ocean Digital WR-230S has a very rudimentary UPnP/DLNA
implementation. It's not possible to use it as a Renderer.
Pretty much the only thing it does is send out an M-SEARCH from Port
1900 to discover any UPnP/DLNA servers.
When running Andy Grundman's UPnP/DLNA Media Interface 1.0, that
M-SEARCH is ignored.
Starting at line 188 of Discovery.pl we see:
Code:
--------------------
# DLNA 7.2.3.5, ignore M-SEARCH with source port 1900 or <1024
if ($port == 1900 || $port <= 1024) {
$log->warn( "Ignoring illegal M-SEARCH request from $iaddr:$port (port must
not be 1900 or <=1024)" );
return;
--------------------
Looking at the relevant protocol document (which I found at
http://docshare04.docshare.tips/files/11856/118566774.pdf#page=34&zoom=100,0,450)
in section 7.2.3.5 we see:
Comment: These guidelines are based on a Microsoft technical advisory
regarding
security concerns for UPnP.
Requirement [7.2.3.5]: UPnP devices may ignore M-SEARCH messages if the
originating
source port is less than or equal to 1024 or equal to 1900.
Oddly enough, feeding the above into google I got a pointer to a
Microsoft security document at:
https://docs.microsoft.com/en-us/windows-server/security/windows-services/security-guidelines-for-disabling-system-services-in-windows-server
Reading the stuff that mentioned uPnP, I get the "Microsoft Windows
recommendation that it's ok to turn off that sort of discovery."
I think that the UPnP server support on LMS needs to NOT ignore M-SEARCH
coming in from that port, if all uPnP client devices are to be
supported.
I suspect that, if one is experiencing a DOS attack from a flood of
M-SEARCH requests, you need a control bit to toggle it off.
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