Open Socket Question
dave at looktowindward.com
Thu Feb 28 05:24:43 CST 2008
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
>> 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 connections on theServerPortNumber with message
Thanks a Lot
All the Best
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