e50d01b4f1
This helper script can now handle both reading of a NFC tag and initiation of NFC connection handover if a peer NFC device is touched. Signed-hostap: Jouni Malinen <j@w1.fi>
162 lines
3.9 KiB
Python
Executable file
162 lines
3.9 KiB
Python
Executable file
#!/usr/bin/python
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#
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# Example nfcpy to wpa_supplicant wrapper for WPS NFC operations
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# Copyright (c) 2012, 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 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 wpactrl
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wpas_ctrl = '/var/run/wpa_supplicant'
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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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try:
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wpas = wpactrl.WPACtrl(ctrl)
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return wpas
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except wpactrl.error, error:
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print "Error: ", error
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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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print wpas.request("WPS_NFC_TAG_READ " + message.encode("hex"))
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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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return wpas.request("NFC_GET_HANDOVER_REQ NDEF WPS").rstrip().decode("hex")
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def wpas_put_handover_sel(message):
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wpas = wpas_connect()
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if (wpas == None):
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return
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print wpas.request("NFC_RX_HANDOVER_SEL " + str(message).encode("hex"))
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def wps_handover_init(peer):
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print "Trying to initiate WPS handover"
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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 message from wpa_supplicant"
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return
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print "Handover request from wpa_supplicant: " + data.encode("hex")
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message = nfc.ndef.Message(data)
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print "Parsed handover request: " + message.pretty()
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nfc.llcp.activate(peer);
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time.sleep(0.5)
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client = nfc.handover.HandoverClient()
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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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nfc.llcp.shutdown()
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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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print "Handover select received"
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print message.pretty()
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wpas_put_handover_sel(message)
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print "Remove peer"
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nfc.llcp.shutdown()
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client.close()
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print "Done with handover"
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def wps_tag_read(tag):
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if len(tag.ndef.message):
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message = nfc.ndef.Message(tag.ndef.message)
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print "message type " + message.type
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for record in 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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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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print "Remove tag"
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while tag.is_present:
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time.sleep(0.1)
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def main():
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clf = nfc.ContactlessFrontend()
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try:
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while True:
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print "Waiting for a tag or peer to be touched"
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while True:
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general_bytes = nfc.llcp.startup({})
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tag = clf.poll(general_bytes)
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if tag == None:
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continue
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if isinstance(tag, nfc.DEP):
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wps_handover_init(tag)
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break
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if tag.ndef:
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wps_tag_read(tag)
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break
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if tag:
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print "Not an NDEF tag - remove tag"
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while tag.is_present:
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time.sleep(0.1)
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break
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except KeyboardInterrupt:
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raise SystemExit
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finally:
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clf.close()
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raise SystemExit
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if __name__ == '__main__':
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main()
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