On 27 Feb 2008, at 16:40, Alex Tweedly wrote:
Dave wrote:
3) In my App, a Server is only allowed to Accept connections from
Certain Clients (this is controlled by the IP Address and a Value
passed to the Server in the Connection Request). This is my
Accept code:
function IStartServer theServerPortNumber
--
-- Accept Connection(s) from Client(s)
--
accept connections on theServerPortNumber with message
"ISMServerContactedByClient"
return empty
end IStartServer
on ServerContactedByClient theIPAddress
local myResult
--
-- Check for Error
--
put the result into myResult
if myResult <> empty then exit ServerContactedByClient
read from socket theIPAddress for kPacketCountSize chars with
message "ISMServerReceivedPacketSize"
end ServerContactedByClient
Can I just look up "theIPAddress" in "ServerContactedByClient" and
if it's not in the list of valid Clients, do do an "exit
ServerContactedByClient" to ignore the request?
That would kind of work, because you neither read from, nor write
to, the socket, so the connection isn't 'active'. However, the
connection will still be open, so you really ought to do "close
theIPAddress" (btw, I think the documentation is misleading. It
says the parameter to the handler called when the connection is
open contains the IP Address, when in fact it contains the socket
descriptor - typically an IP Address and port, but sometimes IP
Addr + port + connectionID. I find it confusing to name that
parameter "theIPAddress"; I always call it pSocket :-).
The Server can "Accept" connections from a number of Clients, surely
if I close the port, then no other clients will be able to connect.
Or do you mean I should (on the Server) close the connection that is
presented to the "ServerContactedByClient" handler? e.g. the IP/Port?
ConnectionID of the Client?
Also, I'm curious.This is probably just because you've snipped code
to send it here, but just in case it isn't ....
you look at "the result" immediately - what do you expect it to
contain at that point ?
I think this was a snipping problem as you say, before I wasn't using
a Callback Handler and so I needed to check the result after the
command returned. However, do need to check "the result" after the
Accept command?:
accept connections on theServerPortNumber with message
"ServerContactedByClient"
Thanks a Lot
All the Best
Dave
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