portable Python ifconfig

MonkeeSage MonkeeSage at gmail.com
Sun Mar 4 02:17:59 CET 2007


On Mar 3, 3:38 pm, Bart Van Loon <bbb... at inGen.be> wrote:
> I'm looking for a portable (FreeBSD and Linux) way of getting typical
> ifconfig information into Python.

Here's a pure python version of the C extension, based on the recipes
you posted. In this version, the 'addr' key will not exist for a non-
existent / non-active interface.

import socket, fcntl, struct, platform

def _ifinfo(sock, addr, ifname):
    iface = struct.pack('256s', ifname[:15])
    info  = fcntl.ioctl(sock.fileno(), addr, iface)
    if addr == 0x8927:
        hwaddr = []
        for char in info[18:24]:
            hwaddr.append(hex(ord(char))[2:])
        return ':'.join(hwaddr)
    else:
        return socket.inet_ntoa(info[20:24])

def ifconfig(ifname):
    ifreq = {'ifname': ifname}
    infos = {}
    osys  = platform.system()
    sock  = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    if osys == 'Linux':
        # offsets defined in /usr/include/linux/sockios.h on linux 2.6
        infos['addr']    = 0x8915 # SIOCGIFADDR
        infos['brdaddr'] = 0x8919 # SIOCGIFBRDADDR
        infos['hwaddr']  = 0x8927 # SIOCSIFHWADDR
        infos['netmask'] = 0x891b # SIOCGIFNETMASK
    elif 'BSD' in osys: # ???
        infos['addr']    = 0x8915
        infos['brdaddr'] = 0x8919
        infos['hwaddr']  = 0x8927
        infos['netmask'] = 0x891b
    try:
        for k,v in infos.items():
            ifreq[k] = _ifinfo(sock, v, ifname)
    except:
        pass
    sock.close()
    return ifreq

ifc = ifconfig('ath0')
if ifc.has_key('addr'):
    print ifc

I'm pretty sure the offsets would be different for BSD, but I don't
have any BSD boxes to test on (looks like from a bit of googling that
you might need to look at /compat/linux/linux_ioctl.h for the offsets
on BSDs). I'll leave it to you to fill in the BSD stuff.

Regards,
Jordan




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