How to set ip address to a computer in Qt (Solved)

houmingc

Seeking help again. My Ubuntu terminal does open, but nothing is wrote onto it. why is it so?

@
QProcess *myProcess = new QProcess;
myProcess->start("gnome-terminal");
myProcess->waitForStarted(5000);
myProcess->write("Qt rocks");
myProcess->write("sudo -S ifconfig eth0 192.168.100.4 netmask 255.255.255.0");

@

p3c0

You need not open a terminal for launching that process. Try following:
@
QStringList args;
args << "-c" << "sudo -S ifconfig eth0 192.168.0.21 < /home/user/passwd.txt";
pro->start("/bin/sh",args);
@

But as said earlier it doesnot provide security as the password file is revealed.
Another way would be to write a script which will run ifconfig command. Call this script instead of that command. Add an entry for this script in /etc/sudoers alongwith the user that will execute this script (i.e linux user with which you run your application). There are plenty of examples on how to edit sudoers using visudo. Check them out.

p3c0

You need not open a terminal for launching that process. Try following:
@
QStringList args;
args << "-c" << "sudo -S ifconfig eth0 192.168.0.21 < /home/user/passwd.txt";
pro->start("/bin/sh",args);
@

But as said earlier it doesnot provide security as the password file is revealed.
Another way would be to write a script which will run ifconfig command. Call this script instead of that command. Add an entry for this script in /etc/sudoers alongwith the user that will execute this script (i.e linux user with which you run your application). There are plenty of examples on how to edit sudoers using visudo. Check them out.

houmingc

i vi a file in /home/ubuntu/passwd.txt with my password. Debug the code. After Application finished running, i do a ifconfig in ubuntu terminal. The ip address has not been changed

@
void SetpcAddress{

                       QProcess *myProcess = new QProcess();
                       QStringList args;
                       args<<"-c"<<
  "sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
                        myProcess->start("/bin/sh",args);

}

int main(void)
{

             SetpcAddress();

}

@

houmingc

i vi a file in /home/ubuntu/passwd.txt with my password. Debug the code. After Application finished running, i do a ifconfig in ubuntu terminal. The ip address has not been changed

@
void SetpcAddress{

                       QProcess *myProcess = new QProcess();
                       QStringList args;
                       args<<"-c"<<
  "sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
                        myProcess->start("/bin/sh",args);

}

int main(void)
{

             SetpcAddress();

}

@

p3c0

Does that command work from outside ?

p3c0

Does that command work from outside ?

houmingc

cat passwd.txt return my password correct

houmingc

cat passwd.txt return my password correct

houmingc

it works when i do a sudo su
it doesn't work without permission, what should i do next?

houmingc

it works when i do a sudo su
it doesn't work without permission, what should i do next?

p3c0

It does work for me from the App and Outside
@
args<<"-c"<<
"sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
@

There should be a space before and after < in above command.

p3c0

It does work for me from the App and Outside
@
args<<"-c"<<
"sudo -S ifconfig eth0 192.168.100.21</home/ubuntu/passwd.txt";
@

There should be a space before and after < in above command.

houmingc

under /opt
cat >password.txt 'Key in my password'
cat password 'Check my password'

its work, thanks alot :>>

houmingc

under /opt
cat >password.txt 'Key in my password'
cat password 'Check my password'

its work, thanks alot :>>

p3c0

Well then get the errors using readyReadStandardError() signal if any.

p3c0

Well then get the errors using readyReadStandardError() signal if any.

houmingc

what does "-c" in front of "sudo -s" meant or used for??

houmingc

what does "-c" in front of "sudo -s" meant or used for??

p3c0

It is for sh so that it reads commands from argument strings. Check "this":http://manpages.ubuntu.com/manpages/utopic/en/man1/sh.1posix.html man page for more details. I hope your system has sh command.