How to get the local mac address?

[Daniel Crespo]

Hi, I tried:

import ctypes
import socket
import struct

def get_macaddress( host):
""" Returns the MAC address of a network host, requires >= WIN2K.
"""

# Check for api availability
try:
SendARP = ctypes.windll.I phlpapi.SendARP
except:
raise NotImplementedE rror('Usage only on Windows 2000 and
above')

# Doesn't work with loopbacks, but let's try and help.
if host == '127.0.0.1' or host.lower() == 'localhost':
host = socket.gethostn ame()

# gethostbyname blocks, so use it wisely.
try:
inetaddr = ctypes.windll.w sock32.inet_add r(host)
if inetaddr in (0, -1):
raise Exception
except:
hostip = socket.gethostb yname(host)
inetaddr = ctypes.windll.w sock32.inet_add r(hostip)

buffer = ctypes.c_buffer (6)
addlen = ctypes.c_ulong( ctypes.sizeof(b uffer))
if SendARP(inetadd r, 0, ctypes.byref(bu ffer), ctypes.byref(ad dlen))
!= 0:
raise WindowsError('R etreival of mac address(%s) - failed' %
host)

# Convert binary data into a string.
macaddr = ''
for intval in struct.unpack(' BBBBBB', buffer):
if intval > 15:
replacestr = '0x'
else:
replacestr = 'x'
macaddr = ''.join([macaddr, hex(intval).rep lace(replacestr ,
'')])

return macaddr.upper()

if __name__ == '__main__':
print 'Your mac address is %s' % get_macaddress( 'localhost')

It works perfect under W2K and above. But I would like to run it on
Win98 too. Any help?

Thanks

Daniel

[Scott David Daniels]

Daniel Crespo wrote:

Hi, I tried: ... # Convert binary data into a string.
macaddr = ''
for intval in struct.unpack(' BBBBBB', buffer):
if intval > 15:
replacestr = '0x'
else:
replacestr = 'x'
macaddr = ''.join([macaddr, hex(intval).rep lace(replacestr , '')])

Replace the above by:
return '%02X' * 6 % struct.unpack(' BBBBBB', buffer)

(doesn't help with win98, though)

--
-Scott David Daniels
sc***********@a cm.org

[Daniel Crespo]

Hi, Scott,

Thanks for your answer

Hi, I tried: ...
# Convert binary data into a string.
macaddr = ''
for intval in struct.unpack(' BBBBBB', buffer):
if intval > 15:
replacestr = '0x'
else:
replacestr = 'x'
macaddr = ''.join([macaddr, hex(intval).rep lace(replacestr , '')])

Replace the above by:
return '%02X' * 6 % struct.unpack(' BBBBBB', buffer)

Replace all the above? I mean all this:

# Convert binary data into a string.
macaddr = ''
for intval in struct.unpack(' BBBBBB', buffer):
if intval > 15:
replacestr = '0x'
else:
replacestr = 'x'
macaddr = ''.join([macaddr, hex(intval).rep lace(replacestr ,
'')])

?
(doesn't help with win98, though)

Sorry, but I don't understand... I would like it to get running on
Win98. I know I have to change some code here, but don't know what :(

[bonono]

Daniel Crespo wrote:

Hi, I tried:

import ctypes
import socket
import struct

def get_macaddress( host):
""" Returns the MAC address of a network host, requires >= WIN2K.
"""

# Check for api availability
try:
SendARP = ctypes.windll.I phlpapi.SendARP
except:
raise NotImplementedE rror('Usage only on Windows 2000 and
above')

# Doesn't work with loopbacks, but let's try and help.
if host == '127.0.0.1' or host.lower() == 'localhost':
host = socket.gethostn ame()

# gethostbyname blocks, so use it wisely.
try:
inetaddr = ctypes.windll.w sock32.inet_add r(host)
if inetaddr in (0, -1):
raise Exception
except:
hostip = socket.gethostb yname(host)
inetaddr = ctypes.windll.w sock32.inet_add r(hostip)

buffer = ctypes.c_buffer (6)
addlen = ctypes.c_ulong( ctypes.sizeof(b uffer))
if SendARP(inetadd r, 0, ctypes.byref(bu ffer), ctypes.byref(ad dlen))
!= 0:
raise WindowsError('R etreival of mac address(%s) - failed' %
host)

# Convert binary data into a string.
macaddr = ''
for intval in struct.unpack(' BBBBBB', buffer):
if intval > 15:
replacestr = '0x'
else:
replacestr = 'x'
macaddr = ''.join([macaddr, hex(intval).rep lace(replacestr ,
'')])

return macaddr.upper()

if __name__ == '__main__':
print 'Your mac address is %s' % get_macaddress( 'localhost')

It works perfect under W2K and above. But I would like to run it on
Win98 too. Any help?

Sorry that I can't help you in any way but have a question myself. Is
there an OS independent way to get this thing(regardles s of how to
format it) in Python ? I know this may not matter if all you want is
Windows but there is just another thread talking about one should write
programs that is OS independent.

Is this a problem of the network library of python ?

[Frank Millman]

bo****@gmail.co m wrote:

Sorry that I can't help you in any way but have a question myself. Is
there an OS independent way to get this thing(regardles s of how to
format it) in Python ? I know this may not matter if all you want is
Windows but there is just another thread talking about one should write
programs that is OS independent.

Is this a problem of the network library of python ?

This is not a generic solution, but it works for me on Linux and
Windows

def getMacAddress() :
if sys.platform == 'win32':
for line in os.popen("ipcon fig /all"):
if line.lstrip().s tartswith('Phys ical Address'):
mac = line.split(':')[1].strip().replac e('-',':')
break
else:
for line in os.popen("/sbin/ifconfig"):
if line.find('Ethe r') > -1:
mac = line.split()[4]
break
return mac

HTH

Frank Millman

[bonono]

Frank Millman wrote:

bo****@gmail.co m wrote:

Sorry that I can't help you in any way but have a question myself. Is
there an OS independent way to get this thing(regardles s of how to
format it) in Python ? I know this may not matter if all you want is
Windows but there is just another thread talking about one should write
programs that is OS independent.

Is this a problem of the network library of python ?

This is not a generic solution, but it works for me on Linux and
Windows

def getMacAddress() :
if sys.platform == 'win32':
for line in os.popen("ipcon fig /all"):
if line.lstrip().s tartswith('Phys ical Address'):
mac = line.split(':')[1].strip().replac e('-',':')
break
else:
for line in os.popen("/sbin/ifconfig"):
if line.find('Ethe r') > -1:
mac = line.split()[4]
break
return mac

Thanks, but how can I associate the result to the socket, assuming that
is the reason for wanting to get at the MAC ?

I see that some *nix implementation use fcntl/ioctl to read this info
out of the file handle of a socket but these modules don't exist on
Windows(may be some other platform as well).

[Frank Millman]

bo****@gmail.co m wrote:

Frank Millman wrote:

bo****@gmail.co m wrote:

Sorry that I can't help you in any way but have a question myself. Is
there an OS independent way to get this thing(regardles s of how to
format it) in Python ? I know this may not matter if all you want is
Windows but there is just another thread talking about one should write
programs that is OS independent.

Is this a problem of the network library of python ?

This is not a generic solution, but it works for me on Linux and
Windows

def getMacAddress() :
if sys.platform == 'win32':
for line in os.popen("ipcon fig /all"):
if line.lstrip().s tartswith('Phys ical Address'):
mac = line.split(':')[1].strip().replac e('-',':')
break
else:
for line in os.popen("/sbin/ifconfig"):
if line.find('Ethe r') > -1:
mac = line.split()[4]
break
return mac

Thanks, but how can I associate the result to the socket, assuming that
is the reason for wanting to get at the MAC ?

I see that some *nix implementation use fcntl/ioctl to read this info
out of the file handle of a socket but these modules don't exist on
Windows(may be some other platform as well).

As you can see, this is a quick and dirty solution.

I am sure you can hack at it some more, bring up the associated ip
address, and compare it with socket.gethostb yaddr() or similar.

I don't know of a more correct solution - maybe someone else can advise
better.

BTW I recall a response some time ago warning that you cannot rely on a
mac address, as they can be modified. Depending on your intended use,
this may or may not be important.

Sorry I cannot be of more help

Frank

[Steve Holden]

bo****@gmail.co m wrote:

Frank Millman wrote:

bo****@gmail. com wrote:

Sorry that I can't help you in any way but have a question myself. Is
there an OS independent way to get this thing(regardles s of how to
format it) in Python ? I know this may not matter if all you want is
Windows but there is just another thread talking about one should write
programs that is OS independent.

Is this a problem of the network library of python ?
This is not a generic solution, but it works for me on Linux and
Windows

def getMacAddress() :
if sys.platform == 'win32':
for line in os.popen("ipcon fig /all"):
if line.lstrip().s tartswith('Phys ical Address'):
mac = line.split(':')[1].strip().replac e('-',':')
break
else:
for line in os.popen("/sbin/ifconfig"):
if line.find('Ethe r') > -1:
mac = line.split()[4]
break
return mac

Thanks, but how can I associate the result to the socket, assuming that
is the reason for wanting to get at the MAC ?

Why should you want to associate a MAC address with a socket? Each
interface has an IP address, and it's that you should be using.
I see that some *nix implementation use fcntl/ioctl to read this info
out of the file handle of a socket but these modules don't exist on
Windows(may be some other platform as well).

Indeed, and that's why most networkers probably wouldn't regard this as
a deficiency in Python's network handling but an inevitable consequence
of the diversity of architectures, utilities and drivers in today's world.

It may well be possible to write Python code that will run on all
platforms (for example, the same way as the os.path module does, by
importing the correct piece of code according to the platform), but it
would need maintenance. Since the interface MAC address is unimportant
for most network applications I guess nobody has so far thought it worth
contributing to the core.

regards
Steve
--
Steve Holden [phone] [phone]
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.python.org/pycon/

[bonono]

Steve Holden wrote:

Why should you want to associate a MAC address with a socket? Each
interface has an IP address, and it's that you should be using. Say for example I want to find out the MAC if a particular interface in
python.
It may well be possible to write Python code that will run on all
platforms (for example, the same way as the os.path module does, by
importing the correct piece of code according to the platform), but it
would need maintenance. Since the interface MAC address is unimportant
for most network applications I guess nobody has so far thought it worth
contributing to the core.

That is a reasonable explanation.

[Steve Holden]

bo****@gmail.co m wrote:

Steve Holden wrote:

Why should you want to associate a MAC address with a socket? Each
interface has an IP address, and it's that you should be using.

Say for example I want to find out the MAC if a particular interface in
python.

When you are asked "why would you want to do something" it isn't
normally considered sufficient to reply "suppose I want to do
something". I'm still trying to find out what use case (apart from
curiosity) drives this need to know.

regards
Steve
--
Steve Holden [phone] [phone]
Holden Web LLC www.holdenweb.com
PyCon TX 2006 www.python.org/pycon/