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#!/usr/bin/env python
"""
The usrp2 recovery app:
When the usrp2 has an unknown or bad ip address in its eeprom,
it may not be possible to communicate with the usrp2 over ip/udp.
This app will send a raw ethernet packet to bypass the ip layer.
The packet will contain a known ip address to burn into eeprom.
Because the recovery packet is sent with a broadcast mac address,
only one usrp2 should be present on the interface upon execution.
This app requires super-user privileges and only works on linux.
"""
import socket
import struct
import optparse
BCAST_MAC_ADDR = 'ff:ff:ff:ff:ff:ff'
RECOVERY_ETHERTYPE = 0xbeee
IP_RECOVERY_CODE = 'addr'
def mac_addr_repr_to_binary_string(mac_addr):
return ''.join(map(lambda x: chr(int(x, 16)), mac_addr.split(':')))
if __name__ == '__main__':
parser = optparse.OptionParser()
parser.add_option('--ifc', type='string', help='ethernet interface name [default=%default]', default='eth0')
parser.add_option('--new-ip', type='string', help='ip address to set [default=%default]', default='192.168.10.2')
(options, args) = parser.parse_args()
#create the raw socket
print "Opening raw socket on interface: ", options.ifc
soc = socket.socket(socket.PF_PACKET, socket.SOCK_RAW)
soc.bind((options.ifc, RECOVERY_ETHERTYPE))
#create the recovery packet
print "Loading packet with new ip address: ", options.new_ip
packet = struct.pack(
'!6s6sH4s4s',
mac_addr_repr_to_binary_string(BCAST_MAC_ADDR),
mac_addr_repr_to_binary_string(BCAST_MAC_ADDR),
RECOVERY_ETHERTYPE,
IP_RECOVERY_CODE,
socket.inet_aton(options.new_ip),
)
soc.send(packet)
print "Done"
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