On Tuesday 23 March 2010 21:58:22 Calvin Walton wrote:
> On Tue, 2010-03-23 at 09:25 -0500, Larry Finger wrote:
> > Will someone please write me udev rule(s) that do the following:
> >
> > 1. Detect a MAC address of FF:FF:FF:FF:FF:FF
> > 2. If this is the first time for this bus address, then generate a random
> > MAC
> > address with the bus address encoded in it.
> > 3. Preserve the address for future reloads
> > 4. Load the saved address into the device.
> > 5. Do the above with only standard external commands - no new programs
> >
> > My skills with udev are not up to the task.
>
> I will warn you that the following is rather untested, as I don't have
> any of the affected hardware (or any b43 devices at all, actually), but
> something along these lines should work. There's no syntax errors, at
> least :)
>
> --- /lib/udev/rules.d/65-persistent-b43-mac-generator.rules
>
> ACTION!="add" GOTO="persistent_b43_mac_generator_end"
>
> SUBSYSTEM=="net", DRIVERS=="b43", ATTR{address}=="ff:ff:ff:ff:ff:ff",
> IMPORT{program}="write_persistent_b43_mac"
>
> SUBSYSTEM=="net", ENV{MACADDRESS_NEW}=="?*", RUN+="ifconfig $env{INTERFACE}
> hw ether $env{MACADDRESS_NEW}"
>
> LABEL="persistent_b43_mac_generator_end"
>
> --- /lib/udev/write_persistent_b43_mac (chmod +x)
>
> #!/bin/bash
>
> # This mac address generation function could be replaced with something better
> MACADDRESS=$(dd if=/dev/urandom bs=1 count=6 2>/dev/null | od -tx1 | head -1
> | cut -d' ' -f2- | awk '{ print $1":"$2":"$3":"$4":"$5":"$6 }')
>
> RULES_FILE='/etc/udev/rules.d/60-persistent-b43-mac.rules'
>
> . /lib64/udev/rule_generator.functions
>
> lock_rules_file
>
> choose_rules_file
>
> echo "DEVPATH==\"$DEVPATH\", DRIVERS==\"b43\",
> ATTR{address}==\"ff:ff:ff:ff:ff:ff\", RUN+=\"ifconfig $INTERFACE hw ether
> $MACADDRESS\"" >> $RULES_FILE
>
> echo "MACADDRESS_NEW=$MACADDRESS"
>
> unlock_rules_file
>
> ---
>
> A new file "/etc/udev/rules.d/60-persistent-b43-mac.rules" will be
> created, which will contain the the saved mac address and bypass the
> generating script on future boots.
>
> This should probably be run by the udev maintainers, but is a start,
> anyways.
>
>
Thanks a lot for this proof of concept. This looks very nice.
--
Greetings, Michael.
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