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Any Linux gods out there?
(9 posts, started )
#1 - PoVo
Any Linux gods out there?
Hi, anyone out there a Linux god?

I'm having some trouble with a set top box IPTV player.

I want to change the MAC address (not spoof it using ifconfig) and I have finally found a function which the player uses to get the address from the HW.

Here's an example of the function used:
MAC=`/home/default/rdir.cgi MACAddress`

And here's the function itself:

MACAddress)
#return STB MAC Address
fw_printenv ethaddr 2>/dev/null | awk ' { if( index($0,"ethaddr=") ) { p
;;

My question is - how do I modify the function to return a different MAC address? (I want to input my own).
#2 - MadCatX
The MACAddress function code appears to be truncated, could you post it again? BTW, ifconfig or ip link will set the device's MAC just fine so I suppose you shouldn't need to change that function...
#3 - PoVo
The problem with changing it with ifconfig is that there is a later compare of current MAC address vs. MAC address from that function or something like that, and it doesn't load up the system.

When I check the MAC via my router - it's changed but on the actual player interface I see the old MAC

Also the function appears to be the same as the one that I've pasted. Not sure what you mean by truncated so.
#4 - heson
Most likely it should be changed to: (substitute XX for your mac.)

MACAddress)
echo XX:XX:XX:XX:XX:XX
;;

or

MACAddress)
echo ethaddr=XX:XX:XX:XX:XX:XX
;;

Added some line breaks to separate the important stuff into lines

1. MACAddress)
2. #return STB MAC Address
3. fw_printenv ethaddr 2>/dev/null |
4. awk ' {
5. if( index($0,"ethaddr=") ) {
6. pMISSINGCODE
7. ;;

I guess 1 and 7 are for a switch statement.
5 matches the occurance of ethaddr=

If the program looks like this, not only is the coder a noob that does not know awk (He should have done awk '/ethaddr=/{pMISSINGCODE) the DRM/access-protection is equally noobstyle.
#5 - heson
Quote from PoVo :Not sure what you mean by truncated so.

"truncate" means "cut short"

The awk line should not en with "p", it should continue like print $0}}', I guess your terminal cuts long likes instead of wrapping them.
#6 - PoVo
Thanks for the help. Here's the un-truncated code:

MACAddress)
#return STB MAC Address
fw_printenv ethaddr 2>/dev/null | awk ' { if( index($0,"ethaddr=") ) { print substr($0,9) } }'
;;

#7 - E.Reiljans
Can you pls post output of "fw_printenv ethaddr" alone?
#8 - heson

switch %0 #probably earlier in the program
... #some omitted lines
MACAddress) #if the "switch" earlier evaluates to MACAddress (until ;;)
#return STB MAC Address #everything following # is a comment
fw_printenv ethaddr #run a function with arguement ethaddr
2>dev/null #send any error codes to /dev/null
| #send the output to the next program
awk #the next program is a awk interpreater
'{ #run every line in the input through this program (until }' )
if( index($0,"ethaddr=") ) #if the string ethaddr= exists on the line
{ print substr($0,9) } #print tthe string that starts on character 9
}' #end of awk program
;; #end of switch-case

"$0" in awk means the full input line.
"index(string, text)" equals to the byte index for the substring test if found in string or 0.
"if (statement) {code}" runs code if statement equals something not 0.

So the program prints the MAC in plain as XX:XX:XX:XX:XX:XX, replace the full line with "echo 'XX:XX:XX:XX:XX:XX'" and you are done.
#9 - PoVo
Thanks for the help guys, I was pretty stupid not checking the output in the first place

Any Linux gods out there?
(9 posts, started )
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