SVN 3080: NIC Registration

[cspence]

I would just stick with the interfaces that are currently up (just like with the client image issue we had the other week). I would assume that if a machine had used PXE to take inventory, the connected interfaces would be more useful. We could detect what interfaces are up. After that, I would have to take a look at the source to give better insight. If I get the chance this week, I’ll look at the source and see what might work.

In the meantime, we can code for the future and use:

[CODE]
ip link show dev $iface | grep link/ether | xargs | cut -d ’ ’ -f 2
[/CODE]

[cspence]

After looking over the code and testing a few things, I have a snippet of code that could replace the mac= statements. It also ditches the use of the legacy net tools command. Another thing to note, it just grabs all MAC addresses, but it makes it usable for imaging. This could be improved to make the primary (or first MAC) the active connection.

[CODE]# Set for loop delimiters to just newline
IFS=$‘\n’

Create a pipe-separated MAC list

for macline in $(ip addr show label eth* | grep link/ether)
do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
mac=$macecho $macline | xargs | cut -d ' ' -f 2
done

Reset delimiters

IFS=[/CODE]

This should be used for any registration functions for fog scripts. Hopefully I didn’t add in any typos this time.

[Tom Elliott]

Typos are perfectly fine, just as long as I can see them and correct them.

I’m wondering, though, would it be better to assign all found mac’s that are connected with splice character that we already use?

we have a function called parseMacList which uses a delimiter of | (pipe) symbol to break apart and find hosts. Using this same principle, if the returned string (base 64 decoded as needed) comes back with | I can explode it out from there and just add all the mac’s to the additional mac list of the relevant host.

Example (I know I can do it, but i’m being particularly lazy today and possibly this week as both my wife and I are currently sick or something)

00:12:34:56:78:01|23:45:67:89:01:23|45:67:89:01:23:45

[Tom Elliott]

And I can see you already thought of that…

[cspence]

[quote=“Tom Elliott, post: 43613, member: 7271”]And I can see you already thought of that…[/quote]

I was about to say…

[Tom Elliott]

I’ll build a function rather than code this into the individually requested files.

I’ll have to adjust the service scripts so they no longer look for HWAddr in the fields, but I think it better to scan only for the mac addresses.

[cspence]

[quote=“Tom Elliott, post: 43616, member: 7271”]I’ll build a function rather than code this into the individually requested files.

I’ll have to adjust the service scripts so they no longer look for HWAddr in the fields, but I think it better to scan only for the mac addresses.[/quote]

Sounds better to me.

[Tom Elliott]

Oh, i do have a thought though.

Using the generate our interfaces file on the fly method, I can add the e-polling capabilities of the kernel to use more proper methods of device management. This means not all devices will automatically have eth* names, but rather whatever the device is. Is there a simpler way without designating the specific devices to search for?

[Tom Elliott]

I wonder
[code]for macline in $(ip addr show | grep link/ether|awk ‘{print $2}’); do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
done[/code]

This, from what I can tell, should allow us to just echo back the mac variable and we don’t need the xargs and cut commands to operate as the only things returned is our pipe delimited list of MAC Addresses.

[Tom Elliott]

[code]# Get All Active MAC Addresses
getMACAddresses()
{
IFS=$‘\n’
# Create a pipe-separated MAC List
for macline in $(ip addr | grep link/ether | awk ‘{print $2}’); do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
mac=$macecho $macline;
done
IFS=
echo $mac
}[/code]

[cspence]

[quote=“Tom Elliott, post: 43618, member: 7271”]Oh, i do have a thought though.

Using the generate our interfaces file on the fly method, I can add the e-polling capabilities of the kernel to use more proper methods of device management. This means not all devices will automatically have eth* names, but rather whatever the device is. Is there a simpler way without designating the specific devices to search for?[/quote]

[CODE]# Set for loop delimiters to just newline
IFS=$‘\n’

Create a pipe-separated MAC list

for macline in $(ip addr | grep link/ether)
do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
mac=$macecho $macline | xargs | cut -d ' ' -f 2
done

Reset delimiters

IFS=[/CODE]

I just realized I was doing a grep on link/ether so that doesn’t include lo. Enjoy!

[Sebastian Roth]

Not using any extra ip tools … /sys/class/net/*/address …

[cspence]

[code]# Get All Active MAC Addresses
getMACAddresses()
{
IFS=$‘\n’
# Create a pipe-separated MAC List
for macline in $(ip addr | grep link/ether | awk ‘{print $2}’); do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
mac=${mac}${macline};
done
IFS=
echo $mac
}[/code]

Caught a bug with your final mac= statement. Also, “ip addr” is fine by itself.

[Tom Elliott]

yeah I saw and edited. The echo needs to occur there. and I am using just ip addr

[Tom Elliott]

[quote=“Uncle Frank, post: 43623, member: 28116”]Not using any extra ip tools … /sys/class/net/*/address …[/quote]

We have to know the exact path name, so it’s simpler to just use the tools that get that for us I think.

[Sebastian Roth]

[quote=“Tom Elliott, post: 43626, member: 7271”]We have to know the exact path name, so it’s simpler to just use the tools that get that for us I think.[/quote]
I don’t think so…
[CODE]# Get All Active MAC Addresses
getMACAddresses()
{
IFS=$‘\n’
# Create a pipe-separated MAC List
for macline in $(cat /sys/class/net/*/address); do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
mac=${mac}${macline};
done
IFS=
echo $mac
}[/CODE]
No ip, no awk, no grep…

[Sebastian Roth]

And I still wonder, why do we need the IFS here??

[cspence]

[quote=“Uncle Frank, post: 43627, member: 28116”]I don’t think so…
[CODE]# Get All Active MAC Addresses
getMACAddresses()
{
IFS=$‘\n’
# Create a pipe-separated MAC List
for macline in $(cat /sys/class/net/*/address); do
# Add a pipe before adding more MACs
if [ -n “$mac” ]; then
mac=$mac|
fi
mac=${mac}${macline};
done
IFS=
echo $mac
}[/CODE]
No ip, no awk, no grep…[/quote]

It grabs lo’s MAC. But I like where this is going…

[Sebastian Roth]

[CODE]… cat /sys/class/net/???*/address …[/CODE] kind of hackish but…

[cspence]

How low can we go?

[CODE]# Get All Active MAC Addresses
getMACAddresses()
{
lomac=00:00:00:00:00:00
cat /sys/class/net/*/address | grep -v $lomac | tr ‘\n’ ‘|’ | sed s/.$//g
}[/CODE]