581 lines
17 KiB
Python
Executable file
581 lines
17 KiB
Python
Executable file
#!/usr/bin/python
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#
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# Example nfcpy to wpa_supplicant wrapper for P2P NFC operations
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# Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
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#
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# This software may be distributed under the terms of the BSD license.
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# See README for more details.
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import os
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import sys
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import time
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import random
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import threading
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import argparse
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import nfc
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import nfc.ndef
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import nfc.llcp
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import nfc.handover
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import logging
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import wpaspy
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wpas_ctrl = '/var/run/wpa_supplicant'
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ifname = None
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init_on_touch = False
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in_raw_mode = False
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prev_tcgetattr = 0
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include_wps_req = True
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include_p2p_req = True
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no_input = False
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srv = None
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continue_loop = True
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terminate_now = False
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def wpas_connect():
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ifaces = []
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if os.path.isdir(wpas_ctrl):
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try:
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ifaces = [os.path.join(wpas_ctrl, i) for i in os.listdir(wpas_ctrl)]
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except OSError, error:
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print "Could not find wpa_supplicant: ", error
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return None
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if len(ifaces) < 1:
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print "No wpa_supplicant control interface found"
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return None
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for ctrl in ifaces:
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if ifname:
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if ifname not in ctrl:
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continue
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try:
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print "Trying to use control interface " + ctrl
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wpas = wpaspy.Ctrl(ctrl)
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return wpas
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except Exception, e:
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pass
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return None
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def wpas_tag_read(message):
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wpas = wpas_connect()
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if (wpas == None):
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return
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cmd = "WPS_NFC_TAG_READ " + str(message).encode("hex")
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global force_freq
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if force_freq:
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cmd = cmd + " freq=" + force_freq
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if "FAIL" in wpas.request(cmd):
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return False
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return True
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def wpas_get_handover_req():
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wpas = wpas_connect()
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if (wpas == None):
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return None
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res = wpas.request("NFC_GET_HANDOVER_REQ NDEF P2P-CR").rstrip().decode("hex")
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if "FAIL" in res:
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return None
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return res
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def wpas_get_handover_req_wps():
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wpas = wpas_connect()
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if (wpas == None):
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return None
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return wpas.request("NFC_GET_HANDOVER_REQ NDEF WPS-CR").rstrip().decode("hex")
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def wpas_get_handover_sel(tag=False):
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wpas = wpas_connect()
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if (wpas == None):
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return None
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if tag:
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return wpas.request("NFC_GET_HANDOVER_SEL NDEF P2P-CR-TAG").rstrip().decode("hex")
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return wpas.request("NFC_GET_HANDOVER_SEL NDEF P2P-CR").rstrip().decode("hex")
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def wpas_get_handover_sel_wps():
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wpas = wpas_connect()
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if (wpas == None):
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return None
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res = wpas.request("NFC_GET_HANDOVER_SEL NDEF WPS-CR");
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if "FAIL" in res:
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return None
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return res.rstrip().decode("hex")
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def wpas_report_handover(req, sel, type):
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wpas = wpas_connect()
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if (wpas == None):
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return None
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cmd = "NFC_REPORT_HANDOVER " + type + " P2P " + str(req).encode("hex") + " " + str(sel).encode("hex")
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global force_freq
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if force_freq:
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cmd = cmd + " freq=" + force_freq
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return wpas.request(cmd)
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def wpas_report_handover_wsc(req, sel, type):
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wpas = wpas_connect()
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if (wpas == None):
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return None
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cmd = "NFC_REPORT_HANDOVER " + type + " WPS " + str(req).encode("hex") + " " + str(sel).encode("hex")
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if force_freq:
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cmd = cmd + " freq=" + force_freq
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return wpas.request(cmd)
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def p2p_handover_client(llc):
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message = nfc.ndef.HandoverRequestMessage(version="1.2")
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message.nonce = random.randint(0, 0xffff)
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global include_p2p_req
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if include_p2p_req:
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data = wpas_get_handover_req()
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if (data == None):
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print "Could not get handover request carrier record from wpa_supplicant"
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return
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print "Handover request carrier record from wpa_supplicant: " + data.encode("hex")
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datamsg = nfc.ndef.Message(data)
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message.add_carrier(datamsg[0], "active", datamsg[1:])
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global include_wps_req
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if include_wps_req:
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print "Handover request (pre-WPS):"
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try:
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print message.pretty()
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except Exception, e:
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print e
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data = wpas_get_handover_req_wps()
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if data:
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print "Add WPS request in addition to P2P"
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datamsg = nfc.ndef.Message(data)
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message.add_carrier(datamsg[0], "active", datamsg[1:])
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print "Handover request:"
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try:
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print message.pretty()
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except Exception, e:
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print e
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print str(message).encode("hex")
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client = nfc.handover.HandoverClient(llc)
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try:
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print "Trying handover";
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client.connect()
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print "Connected for handover"
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except nfc.llcp.ConnectRefused:
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print "Handover connection refused"
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client.close()
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return
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except Exception, e:
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print "Other exception: " + str(e)
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client.close()
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return
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print "Sending handover request"
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if not client.send(message):
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print "Failed to send handover request"
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print "Receiving handover response"
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message = client._recv()
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if message is None:
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print "No response received"
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client.close()
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return
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if message.type != "urn:nfc:wkt:Hs":
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print "Response was not Hs - received: " + message.type
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client.close()
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return
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print "Received message"
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try:
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print message.pretty()
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except Exception, e:
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print e
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print str(message).encode("hex")
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message = nfc.ndef.HandoverSelectMessage(message)
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print "Handover select received"
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try:
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print message.pretty()
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except Exception, e:
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print e
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for carrier in message.carriers:
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print "Remote carrier type: " + carrier.type
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if carrier.type == "application/vnd.wfa.p2p":
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print "P2P carrier type match - send to wpa_supplicant"
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wpas_report_handover(data, carrier.record, "INIT")
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break
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print "Remove peer"
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client.close()
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print "Done with handover"
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global only_one
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if only_one:
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print "only_one -> stop loop"
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global continue_loop
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continue_loop = False
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global no_wait
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if no_wait:
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print "Trying to exit.."
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global terminate_now
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terminate_now = True
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class HandoverServer(nfc.handover.HandoverServer):
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def __init__(self, llc):
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super(HandoverServer, self).__init__(llc)
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self.sent_carrier = None
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self.ho_server_processing = False
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self.success = False
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def process_request(self, request):
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self.ho_server_processing = True
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clear_raw_mode()
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print "HandoverServer - request received"
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try:
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print "Parsed handover request: " + request.pretty()
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except Exception, e:
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print e
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sel = nfc.ndef.HandoverSelectMessage(version="1.2")
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found = False
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for carrier in request.carriers:
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print "Remote carrier type: " + carrier.type
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if carrier.type == "application/vnd.wfa.p2p":
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print "P2P carrier type match - add P2P carrier record"
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found = True
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self.received_carrier = carrier.record
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print "Carrier record:"
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try:
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print carrier.record.pretty()
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except Exception, e:
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print e
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data = wpas_get_handover_sel()
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if data is None:
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print "Could not get handover select carrier record from wpa_supplicant"
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continue
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print "Handover select carrier record from wpa_supplicant:"
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print data.encode("hex")
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self.sent_carrier = data
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wpas_report_handover(self.received_carrier, self.sent_carrier,
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"RESP")
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message = nfc.ndef.Message(data);
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sel.add_carrier(message[0], "active", message[1:])
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break
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for carrier in request.carriers:
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if found:
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break
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print "Remote carrier type: " + carrier.type
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if carrier.type == "application/vnd.wfa.wsc":
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print "WSC carrier type match - add WSC carrier record"
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found = True
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self.received_carrier = carrier.record
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print "Carrier record:"
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try:
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print carrier.record.pretty()
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except Exception, e:
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print e
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data = wpas_get_handover_sel_wps()
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if data is None:
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print "Could not get handover select carrier record from wpa_supplicant"
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continue
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print "Handover select carrier record from wpa_supplicant:"
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print data.encode("hex")
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self.sent_carrier = data
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wpas_report_handover_wsc(self.received_carrier,
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self.sent_carrier, "RESP")
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message = nfc.ndef.Message(data);
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sel.add_carrier(message[0], "active", message[1:])
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found = True
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break
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print "Handover select:"
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try:
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print sel.pretty()
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except Exception, e:
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print e
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print str(sel).encode("hex")
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print "Sending handover select"
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self.success = True
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return sel
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def clear_raw_mode():
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import sys, tty, termios
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global prev_tcgetattr, in_raw_mode
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if not in_raw_mode:
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return
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fd = sys.stdin.fileno()
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termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr)
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in_raw_mode = False
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def getch():
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import sys, tty, termios, select
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global prev_tcgetattr, in_raw_mode
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fd = sys.stdin.fileno()
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prev_tcgetattr = termios.tcgetattr(fd)
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ch = None
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try:
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tty.setraw(fd)
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in_raw_mode = True
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[i, o, e] = select.select([fd], [], [], 0.05)
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if i:
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ch = sys.stdin.read(1)
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finally:
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termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr)
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in_raw_mode = False
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return ch
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def p2p_tag_read(tag):
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success = False
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if len(tag.ndef.message):
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for record in tag.ndef.message:
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print "record type " + record.type
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if record.type == "application/vnd.wfa.wsc":
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print "WPS tag - send to wpa_supplicant"
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success = wpas_tag_read(tag.ndef.message)
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break
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if record.type == "application/vnd.wfa.p2p":
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print "P2P tag - send to wpa_supplicant"
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success = wpas_tag_read(tag.ndef.message)
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break
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else:
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print "Empty tag"
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return success
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def rdwr_connected_p2p_write(tag):
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print "Tag found - writing"
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global p2p_sel_data
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tag.ndef.message = str(p2p_sel_data)
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print "Done - remove tag"
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global only_one
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if only_one:
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global continue_loop
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continue_loop = False
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global p2p_sel_wait_remove
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return p2p_sel_wait_remove
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def wps_write_p2p_handover_sel(clf, wait_remove=True):
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print "Write P2P handover select"
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data = wpas_get_handover_sel(tag=True)
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if (data == None):
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print "Could not get P2P handover select from wpa_supplicant"
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return
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global p2p_sel_wait_remove
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p2p_sel_wait_remove = wait_remove
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global p2p_sel_data
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p2p_sel_data = nfc.ndef.HandoverSelectMessage(version="1.2")
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message = nfc.ndef.Message(data);
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p2p_sel_data.add_carrier(message[0], "active", message[1:])
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print "Handover select:"
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try:
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print p2p_sel_data.pretty()
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except Exception, e:
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print e
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print str(p2p_sel_data).encode("hex")
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print "Touch an NFC tag"
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clf.connect(rdwr={'on-connect': rdwr_connected_p2p_write})
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def rdwr_connected(tag):
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global only_one, no_wait
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print "Tag connected: " + str(tag)
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if tag.ndef:
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print "NDEF tag: " + tag.type
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try:
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print tag.ndef.message.pretty()
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except Exception, e:
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print e
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success = p2p_tag_read(tag)
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if only_one and success:
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global continue_loop
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continue_loop = False
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else:
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print "Not an NDEF tag - remove tag"
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return not no_wait
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def llcp_worker(llc):
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global init_on_touch
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if init_on_touch:
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print "Starting handover client"
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p2p_handover_client(llc)
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return
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global no_input
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if no_input:
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print "Wait for handover to complete"
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else:
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print "Wait for handover to complete - press 'i' to initiate ('w' for WPS only, 'p' for P2P only)"
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global srv
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global wait_connection
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while not wait_connection and srv.sent_carrier is None:
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if srv.ho_server_processing:
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time.sleep(0.025)
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elif no_input:
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time.sleep(0.5)
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else:
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global include_wps_req, include_p2p_req
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res = getch()
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if res == 'i':
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include_wps_req = True
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include_p2p_req = True
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elif res == 'p':
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include_wps_req = False
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include_p2p_req = True
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elif res == 'w':
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include_wps_req = True
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include_p2p_req = False
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else:
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continue
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clear_raw_mode()
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print "Starting handover client"
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p2p_handover_client(llc)
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return
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clear_raw_mode()
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print "Exiting llcp_worker thread"
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def llcp_startup(clf, llc):
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print "Start LLCP server"
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global srv
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srv = HandoverServer(llc)
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return llc
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def llcp_connected(llc):
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print "P2P LLCP connected"
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global wait_connection
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wait_connection = False
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global init_on_touch
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if not init_on_touch:
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global srv
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srv.start()
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if init_on_touch or not no_input:
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threading.Thread(target=llcp_worker, args=(llc,)).start()
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return True
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def terminate_loop():
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global terminate_now
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return terminate_now
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def main():
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clf = nfc.ContactlessFrontend()
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parser = argparse.ArgumentParser(description='nfcpy to wpa_supplicant integration for P2P and WPS NFC operations')
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parser.add_argument('-d', const=logging.DEBUG, default=logging.INFO,
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action='store_const', dest='loglevel',
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help='verbose debug output')
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parser.add_argument('-q', const=logging.WARNING, action='store_const',
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dest='loglevel', help='be quiet')
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parser.add_argument('--only-one', '-1', action='store_true',
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help='run only one operation and exit')
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parser.add_argument('--init-on-touch', '-I', action='store_true',
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help='initiate handover on touch')
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parser.add_argument('--no-wait', action='store_true',
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help='do not wait for tag to be removed before exiting')
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parser.add_argument('--ifname', '-i',
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help='network interface name')
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parser.add_argument('--no-wps-req', '-N', action='store_true',
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help='do not include WPS carrier record in request')
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parser.add_argument('--no-input', '-a', action='store_true',
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help='do not use stdout input to initiate handover')
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parser.add_argument('--tag-read-only', '-t', action='store_true',
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help='tag read only (do not allow connection handover)')
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parser.add_argument('--freq', '-f',
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help='forced frequency of operating channel in MHz')
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parser.add_argument('command', choices=['write-p2p-sel'],
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nargs='?')
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args = parser.parse_args()
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global only_one
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only_one = args.only_one
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global no_wait
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no_wait = args.no_wait
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global force_freq
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force_freq = args.freq
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logging.basicConfig(level=args.loglevel)
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global init_on_touch
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init_on_touch = args.init_on_touch
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if args.ifname:
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global ifname
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ifname = args.ifname
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print "Selected ifname " + ifname
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if args.no_wps_req:
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global include_wps_req
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include_wps_req = False
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if args.no_input:
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global no_input
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no_input = True
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clf = nfc.ContactlessFrontend()
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global wait_connection
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try:
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if not clf.open("usb"):
|
|
print "Could not open connection with an NFC device"
|
|
raise SystemExit
|
|
|
|
if args.command == "write-p2p-sel":
|
|
wps_write_p2p_handover_sel(clf, wait_remove=not args.no_wait)
|
|
raise SystemExit
|
|
|
|
global continue_loop
|
|
while continue_loop:
|
|
print "Waiting for a tag or peer to be touched"
|
|
wait_connection = True
|
|
try:
|
|
if args.tag_read_only:
|
|
if not clf.connect(rdwr={'on-connect': rdwr_connected}):
|
|
break
|
|
else:
|
|
if not clf.connect(rdwr={'on-connect': rdwr_connected},
|
|
llcp={'on-startup': llcp_startup,
|
|
'on-connect': llcp_connected},
|
|
terminate=terminate_loop):
|
|
break
|
|
except Exception, e:
|
|
print "clf.connect failed"
|
|
|
|
global srv
|
|
if only_one and srv and srv.success:
|
|
raise SystemExit
|
|
|
|
except KeyboardInterrupt:
|
|
raise SystemExit
|
|
finally:
|
|
clf.close()
|
|
|
|
raise SystemExit
|
|
|
|
if __name__ == '__main__':
|
|
main()
|