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Hey Mike
You solve this by writing a proxy server. I did this once at my
prev employer.
What you do is to rely on a unix system call "select()". Read the man
page carefully,
its a bit tricky to use. You can do this in perl, and oetherthings
but the sceleton code
here is in C (NB: I haven't checked all the syntak down to parameter
order, etc).
main()
{
int listen_socket, CSsocket;
fd_set openset, readset;
/* first we create the socket for incoming
connections
and connect to the Chat Server. */
/* make sure you read man 7 tcp, man 7 socket,
and
man man 2 socket */
listen_socket = socket(PF_INET, SOCK_STREAM,
0);
bind(listen_socket, ...); /* to whatever
port, see man bind */
listen(listen_socket, 10); /* see
man listen */
CSsocket = socket(PF_INET, SOCK_STREAM,
0);
connect(CSsocket, address of chat server, ...);
/* see man connect() */
FD_ZERO(openset);
FD_SET(openset, listensocket);
FD_SET(openset, CSsocket);
while(1) {
memcpy(readset, openset,
sizeof(fd_set);
/* select will go into
blocking wait until one of
the files have something
to be read */
n = select(maxfd,
&readset, NULL, NULL, NULL);
/* we must read
from CS first, or we risk deadlock! */
if (FD_ISSET(openset,
CSsocket) {
rc = read(CSsocket, ..., O_NONBLOCK);
if(rc == -1 and errno == EAGAIN) break;
/* figure out which connection to write on */
write(some_connection, ...);
continue;
}
FD_CLR(CSsocket, openset);
/* accept new connections
*/
if (FD_ISSET(listen_socket,
openset) {
new_connection = accept(listen_socket);
FD_SET(new_connection, openset);
/* set new maxfd */
};
FD_CLR(listen_socket
, readset);
/* now read from
clients and send to chat server */
for (i = 0; i
< maxfd, i++) {
if (FD_ISSET(i, readset);
read(i, ...);
if EOF {
close (i);
FD_CLR(i, openset);
reset maxfd;
continue;
}
write (CSsocket);
}
}
}
Michael McConnell wrote:
Yes,
I definately should go into more detail about what I want to do.
Seeing as how Windows NT doesn't do
socket handling very well it seems
a bad idea to have a Chat server that
is dealing with multiple socket
connect,
and since our only developers at this
company are Windows NT developers,
there is no way to get this application
wrote in Linux. I believe that if I
can
get linux to handle the TCP Handshaking
and such, it would prove to be more
stable than having Window NT do it.
So the plan is to to have Linux accept
the
connects and do the socket spooling.
I would like to take all the data and
direct
it to a stream that would point to
the NT Chat Server. The Linux box would
then
deside based on headers and such in
the chat server as to which client the
data
belongs to.
Make sense?
Mike
--
_________________________________________________________________________
Terje Eggestad terje.eggestad@xxxxxxxx
Scali Scalable Linux Systems http://www.scali.com
Olaf Helsets Vei 6 tel: +47 22 62 89 61 (OFFICE)
P.O.Box 70 Bogerud +47 975 31 574 (MOBILE)
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