Solved

a problem with rcmd and rexec  routines

Posted on 2002-03-19
3
932 Views
Last Modified: 2012-05-04
My linux application need a way of starting its remote server on the same platform.
rcmd and rexec are for me the answer to the need, but
then a problem arises.

For the rcmd I'm providing the necessary arguments
perfectly :
   For a try on single machine using a looping TCP
   connection (i.e to 127.0.0.1 with localhost as the
   hostname).  
   
    char **ahost;
    *host=(char *)malloc(30);
    strcpy(*host,"localhost");
    rcmd(**ahost,514,"root","spy","mkdir new",0)
   
The execution of this compiled version of these codes
give as error message: Permission Dinied.

showing that The authentication failed.

for the case of rexec I try with a similar demo with
port number 512 but this
time the error message is
-> :localhost.localdomain: connection refused. (which appears after a long waiting )

My question is :
--------------
  Is there some special configurations
practices needed by the server (rshd and rexecd)of these two routines.
Or is there any special way to use this two routines? If
yes can u please tell me the minimum necessary
requirements that must checked before having a successful
usage of this two routines.
steps
 







 

  ahost,rport,locuser,ruser



0
Comment
Question by:marech
3 Comments
 
LVL 2

Accepted Solution

by:
pheur earned 100 total points
ID: 6902249
1. Forget about rcmd, rsh, rexec, rlogin, and even telnet. use ssh instead. Any decent Linux or UNIX distribution has it. You will have to use

system("ssh ruser@host remote command");

This normally requires you to enter a password. To avoid it generate with ssh-keygen a keypair, and install the public key on the remote machine and the private key on the machine starting ssh. See the ssh documentation for more details.

2. If you still insist on using the horribly insecure rcmd/rexec, make sure that rexec is enabled on the remote machine in /etc/inetd.conf, and is not filtered by the firewall.
3. Applications that start their servers on remote machines are a very bad habit.

----
Radu-Adrian Feurdean
Brainbench Linux MVP
0
 
LVL 20

Expert Comment

by:jmcg
ID: 9901570
No comment has been added lately, so it's time to clean up this TA.
I will leave the following recommendation for this question in the Cleanup topic area:

Accept: pheur {http:#6902249}

Please leave any comments here within the next seven days.
PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!

jmcg
EE Cleanup Volunteer
0

Featured Post

Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
File system unmounted 3 157
GUI development for Ubuntu 8 217
running two linux commands sequentially in background 16 49
Understanding curl command 1 56
Have you ever been frustrated by having to click seven times in order to retrieve a small bit of information from the web, always the same seven clicks, scrolling down and down until you reach your target? When you know the benefits of the command l…
The purpose of this article is to demonstrate how we can upgrade Python from version 2.7.6 to Python 2.7.10 on the Linux Mint operating system. I am using an Oracle Virtual Box where I have installed Linux Mint operating system version 17.2. Once yo…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question