RE: Listening on system restricted ports
RE: Listening on system restricted ports
- Subject: RE: Listening on system restricted ports
- From: "Jamie Wood" <email@hidden>
- Date: Fri, 25 Mar 2005 22:50:58 -0800
I'm not sure if this will exactly solve your problem, but I have found it to
be an excellent solution for giving Java processes elevated privileges:
http://www.amug.org/~glguerin/sw/index.html#authkit
I you have specific questions about it, you might want to post them to the
java-dev list. I know that the author of the above toolkit is a frequent
poster on that mailing list, and might have some good suggestions.
Hope this helps,
Jamie
From: OL&L Lists <email@hidden>
To: "Jamie Wood" <email@hidden>, email@hidden
Subject: RE: Listening on system restricted ports
Date: Fri, 25 Mar 2005 18:30:54 -0800
At 6:23 PM -0800 3/25/05, Jamie Wood wrote:
My suggestion would be to have your helper tool open the socket, bind to
the restricted port, and then pass the file descriptor back to your main
program via a Unix domain socket. Check out MoreAuthSample for details:
http://developer.apple.com/samplecode/MoreAuthSample/MoreAuthSample.html
Hope this helps,
Jamie
That sounds good. Thanks for the reference. Now for the big question: can
it be done from Java code? The problem is I have already-existing Java code
on other plats that open and bind to restricted ports without any C code
whatsoever. Now I want to make that same Java code work on OS X (if
possible without any C code). I can write a JNI-C layer as an interface but
my main goal is to get the existing Java code to work on OS X as-is but the
restricted port issue is blocking me from getting it to work.
Thanks,
Michael
Orbital Launch & Lift, Inc.
http://www.orbitallaunch.com
=================
From: OL&L Lists <email@hidden>
To: email@hidden
Subject: Listening on system restricted ports
Date: Fri, 25 Mar 2005 18:00:32 -0800
I need to bind to restricted ports (below 1024). I can't use a helper
tool because helper tools are supposed to be one shot programs. What is
the correct way to do this on OS X? Can I use a helper tool to elevate a
listening process's privileges, bind to a restricted port, then lower the
listener's privileges? Also, I would like to be able to do so from both
Java and C.
Thanks,
Michael
Orbital Launch & Lift, Inc.
http://www.orbitallaunch.com
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