Python script to change resolv.conf [Permission issue]

Hey everybody, I am just newbie at Python. I wanted to write a script in Python to change DNS.

But I learn开发者_如何学JAVAed that resolv.conf is read-only file, after writing that code. Because I took that error: IOError: [Errno 13] Permission denied: '/etc/resolv.conf'

myFile= open("/etc/resolv.conf", "w")

Then, I made a little search and found os.chmode() and I wrote a new line to remove all privileges of resolv.conf which is:

os.chmod("/etc/resolv.conf", 0777)

But now I'm taking that error: IOError: [Errno 13] Permission denied: '/etc/resolv.conf'

I can't get over this question and I'm waiting for your advices.

Thank you.

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/etc/resolv.conf is typically owned by root. Unless your script is run in such a way that it has root privileges, it won't be able to change the file.

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Chmod you must run as root before your script. And when you get permissions, your script will run without errors

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You should never allow for a file like resolv.conf to be writable by all. It looks like you were chmod'ing it, or trying to anyway, to 777. That's really bad. There is a lot someone could do by changing a resolver on a host and making that host point to systems that were setup for malicious reasons. For example, one could have their own LDAP server, and by changing resolv.conf point a system at their resolver, and at their LDAP server, thereby possibly gaining privileged levels of access.

Keep this file locked down at all times.