Hi, it is a restriction by design of rlogin / rsh that the client port must be in the "restricted ports" area < 1024, which only the root user may open.
I assume the reason for this is, that through the rsh protocol, if user x has set up a .rhosts file for his account, then user y could "spoof" the system by making the remote think he were x. UNIX systems fix this by making the rsh program run with "setuid" permissions, that is non-root clients can call the rsh program which then executes with root permissions. In your concrete situation, I would recommend that you either call the external rsh binary program from Java (thus inheriting the root permission via the setuid bit), or you switch to using a Java SSH client such as JSch. References: http://en.wikipedia.org/wiki/Remote_Shell http://en.wikipedia.org/wiki/Rlogin http://tools.ietf.org/html/rfc1282 http://www.jcraft.com/jsch/index.html Cheers, -- Martin Oberhuber, Senior Member of Technical Staff, Wind River Target Management Project Lead, DSDP PMC Member http://www.eclipse.org/dsdp/tm > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] > Sent: Friday, June 13, 2008 10:19 AM > To: dev@commons.apache.org > Subject: RShell:All ports in use or insufficient permssion. > > Hi, > > I want to invoke a command in a remote machine using > RSh(remote shell) from my java app, so I'm trying out the > examples.rshell class in commons-net-1.4.1. > The only way it succeeded was running the Java app from > linux(as root) to linux, but my app will not be run as root, > and I must invoke a command using rsh. > From the linux shell, it works fine using the rsh command > from non-root user to a non-root user in other linux machine. > The command is like this one: > rsh -l myuser remoteIP "ls -l" > > The question is: Why must it be run as root the > examples.rshell class if linux OS allows me to do it as > non-root from the command shell? Can I get it not being root > in the source machine? > > As I've seen in the code, it limits itself and throws an exception: > if (localPort < MIN_CLIENT_PORT) > throw new BindException("All ports in use or > insufficient permssion."); > > Thanks! > > > > ______________________________________________ > Enviado desde Correo Yahoo! La bandeja de entrada más inteligente. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
