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# Usage:
#
# $ python dummy_map_server <bind-ip> <port>
#
import sys
import socket
import hmac
import hashlib
map_notify = (b"\x40\x00\x00\x01"
+ "\x00\x00\x00\x00"
+ "\x00\x00\x00\x00"
+ "\x00\x01\x00\x14" # key ID, Auth data length = 20
+ "\x00\x00\x00\x00"
+ "\x00\x00\x00\x00"
+ "\x00\x00\x00\x00"
+ "\x00\x00\x00\x00"
+ "\x00\x00\x00\x00" # auth data
+ "\x00\x01"
+ "\x51\x80\x01\x18\x00\x00\x00\x00\x00\x01\x06\x00\x01\x00\x01\x01"
+ "\x00\x00\x00\x04\x00\x01\x06\x00\x03\x01")
notify_nonce_offset = 4
notify_auth_data_len = 20
register_nonce_offset = 4
auth_data_offset = 16
secret_key = 'password'
def build_notify(nonce):
rp = bytearray(map_notify)
for i in range(0, 8):
rp[notify_nonce_offset + i] = nonce[i]
# compute hash
digest = hmac.new(secret_key, rp, hashlib.sha1).digest()
for i in range(0, notify_auth_data_len):
rp[auth_data_offset + i] = digest[i]
return rp
def run(host, port):
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_address = (host, int(port))
sock.bind(server_address)
while True:
data, address = sock.recvfrom(4096)
# extract nonce from message
nonce = data[register_nonce_offset:register_nonce_offset+8]
rp = build_notify(nonce)
sock.sendto(rp, address)
print 'Replied to ', ''.join(x.encode('hex') for x in nonce)
if __name__ == "__main__":
if len(sys.argv) < 2:
raise Exception('IP and port expected')
run(sys.argv[1], sys.argv[2])
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