1 files changed, 52 insertions, 0 deletions
diff --git a/host/apps/usrp2_recovery.py b/host/apps/usrp2_recovery.py
new file mode 100755
index 000000000..48c1121cb
--- /dev/null
+++ b/host/apps/usrp2_recovery.py
@@ -0,0 +1,52 @@
+#!/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(usage='usage: %prog [options]\n'+__doc__)
+    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 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),
+    )
+
+    print "Sending packet (%d bytes)"%len(packet)
+    soc.send(packet)
+    print "Done"