Raw packet socket for Linux
Only in linux, sorry.
If you need raw sockets in your python script, you have to run it as root or make it SUID root. Alternatively, you can use file capabilities to grant extended priviliges to a binary. Unfortunately, this only works on binaries and not on scripts, which means you have to set the capability on the python binary.
How does it work?
As mentioned above, you can only set capabilties on a binary. Therefore, this module has a helper binary, which will get the RAW_NET capability. This binary is spawned by the rawsocket python module every time you create a new raw socket. The helper uses its capability to create the socket and then passes the file descriptor back to the calling program.
In linux you can pass file descriptors through unix domain sockets by using the sendmsg() system call and SCM_RIGHTS. See also fd passing.
pip install rawsocket
Or use the standard method:
python setup.py install
This will install the extension module and the helper binary. But it will not set the file capability on the helper binary. You have two choices:
Grant every user access to the helper (simple, not recommended):
setcap cap_net_raw+ep rawsocket-helper
Grant access only to users which are member of a specific group (recommended):
chmod 750 rawsocket-helper chown root:yourgroup rawsocket-helper setcap cap_net_raw+ep rawsocket-helper
import socket, rawsocket
fd = rawsocket.rawsocket_fd()
s = socket.fromfd(fd, socket.AF_PACKET, socket.SOCK_RAW)
You see easy as pie ;)
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