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Full Discussion: calling UNIX commands C/C++
Top Forums Programming calling UNIX commands C/C++ Post 302296463 by pludi on Wednesday 11th of March 2009 06:45:38 AM
Old 03-11-2009
Quote:
Originally Posted by Asteroid
[...]So, how can i adopt SUID by setting the Bit. any help[...]
chmod u+s file
also man chmod
Quote:
Originally Posted by Asteroid
[...]so it mean, i cannot su - root in my program as it will tend to read from tty.
That is correct

If, and only if, you do not need to invoke more that 2-3 programs with as root, without the ability for the user to change anything about the command line, your approach might be ok. Anything more will probably be unmaintainable quickly and/or introduce possible security risks. So unless you only need a wrapper for 2-3 (at max) pre-defined commands that do not accept any user interaction I'd advise to install sudo.
 

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su-to-root(1)						      Debian GNU/Linux manual						     su-to-root(1)

NAME
su-to-root - A simple script to give an `interactive' front-end to su. It can be used in menu entry commands to ask for the root password SYNOPSIS
su-to-root [-X] [-p <user>] -c <command> DESCRIPTION
Most menu entries simply start an editor or a game or whatever. But some menu entries would like to give the user the ability to change important settings in the system, that require root privileges. su-to-root can be used to ask for the root password. OPTIONS
-c <command> The command to execute as a string. This option is mandatory. -p <user> The name of the user to change to, instead of root. -X The command is a X11 program that does not require a terminal. This is to be used with menu entries that declare needs="X11". ENVIRONMENT
SU_TO_ROOT_X Select the su-like program called by su-to-root -X. Supported values are gksu, kdesu, kde4su, ktsuss, sux, gksudo and kdesudo. kde4su denotes the KDE4 version of kdesu. When this variable is not set su-to-root will currently try to use gksu, kdesu, kde4su, ktsuss, sux and the built-in code, in that order with the exception that under a KDE session, kdesu and kde4su are prefered over gksu. The exact set of programs to try and their order is subject to change without notice. SU_TO_ROOT_SU Select the su-like program used in text mode. Supported values are sudo, sux and su, the later being the default. FILES
/etc/su-to-rootrc ~/.su-to-rootrc su-to-root will source these files at startup in this order. This lets you define and modify the environment variables above without restarting your X session. COPYING
su-to-root is distributed under the GNU General Public License. (GPL 2.0 or greater). AUTHORS
Joost Witteveen <joostje@debian.org> X11 support by Morten Brix Pedersen and Bill Allombert <ballombe@debian.org> SEE ALSO
update-menus(1), menufile(5), /usr/share/doc/menu/html Debian Project 20 October 1998 su-to-root(1)
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