[TriLUG] TCP socket connections in Linux, gathering data from
embedded device - - was WGET-LYNX??
Timothy A. Chagnon
tchagnon at futeki.net
Fri Sep 24 20:06:48 EDT 2004
On Fri, 2004-09-24 at 18:19, Michael Thompson wrote:
> Any urls/snippets of this process would be very interesting to me, and
> I'm sure the rest of the list as well! :)
There's not a lot of info about writing your own xinetd services because
they're just normal programs that read/write from standard in and
standard out. You just need to make a file for your program in
/etc/xinetd.d specifying the xinetd options for it, like tcp/udp, socket
or datagram. The xinetd.conf(5) man page will help with this.
You can even do something silly like make cat a service. I made a file
called /etc/xinetd.d/cat with this in it:
# default: off
# description: reprints input with line numbers
disable = no
socket_type = stream
protocol = tcp
wait = no
user = someuser
server = /bin/cat
server_args = -n
Also had to add this to the bottom of /etc/services to specify the port:
Then restart xinetd and do a
$ telnet localhost 31400
shows runs cat and numbers your lines of input. This isn't really
useful, just an example. Note you have to manually break your telnet
session with Ctrl+] for this example.
There are plenty of pages about configuring options for xinetd. Check
out xinetd.org or search at tldp.org.
Timothy A. Chagnon <tchagnon at futeki.net>
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