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authorJouni Malinen <jouni@qca.qualcomm.com>2013-02-22 06:48:40 (GMT)
committerJouni Malinen <j@w1.fi>2014-01-27 20:08:14 (GMT)
commitc07f2615a0ad182d49e7a5dbc31863c3aa3ac539 (patch)
tree2f120c0c9c33d2af16fd2c48ecd911f7485b367c /wpa_supplicant/examples
parent12288d848c9a507cfa834cbda1eec0bef7c53b5a (diff)
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P2P NFC: Add script for connection handover with nfcpy
Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
Diffstat (limited to 'wpa_supplicant/examples')
-rwxr-xr-xwpa_supplicant/examples/p2p-nfc.py581
1 files changed, 581 insertions, 0 deletions
diff --git a/wpa_supplicant/examples/p2p-nfc.py b/wpa_supplicant/examples/p2p-nfc.py
new file mode 100755
index 0000000..848f79f
--- /dev/null
+++ b/wpa_supplicant/examples/p2p-nfc.py
@@ -0,0 +1,581 @@
+#!/usr/bin/python
+#
+# Example nfcpy to wpa_supplicant wrapper for P2P NFC operations
+# Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi>
+#
+# This software may be distributed under the terms of the BSD license.
+# See README for more details.
+
+import os
+import sys
+import time
+import random
+import threading
+import argparse
+
+import nfc
+import nfc.ndef
+import nfc.llcp
+import nfc.handover
+
+import logging
+
+import wpaspy
+
+wpas_ctrl = '/var/run/wpa_supplicant'
+ifname = None
+init_on_touch = False
+in_raw_mode = False
+prev_tcgetattr = 0
+include_wps_req = True
+include_p2p_req = True
+no_input = False
+srv = None
+continue_loop = True
+terminate_now = False
+
+def wpas_connect():
+ ifaces = []
+ if os.path.isdir(wpas_ctrl):
+ try:
+ ifaces = [os.path.join(wpas_ctrl, i) for i in os.listdir(wpas_ctrl)]
+ except OSError, error:
+ print "Could not find wpa_supplicant: ", error
+ return None
+
+ if len(ifaces) < 1:
+ print "No wpa_supplicant control interface found"
+ return None
+
+ for ctrl in ifaces:
+ if ifname:
+ if ifname not in ctrl:
+ continue
+ try:
+ print "Trying to use control interface " + ctrl
+ wpas = wpaspy.Ctrl(ctrl)
+ return wpas
+ except Exception, e:
+ pass
+ return None
+
+
+def wpas_tag_read(message):
+ wpas = wpas_connect()
+ if (wpas == None):
+ return
+ cmd = "WPS_NFC_TAG_READ " + str(message).encode("hex")
+ global force_freq
+ if force_freq:
+ cmd = cmd + " freq=" + force_freq
+ if "FAIL" in wpas.request(cmd):
+ return False
+ return True
+
+
+def wpas_get_handover_req():
+ wpas = wpas_connect()
+ if (wpas == None):
+ return None
+ res = wpas.request("NFC_GET_HANDOVER_REQ NDEF P2P-CR").rstrip().decode("hex")
+ if "FAIL" in res:
+ return None
+ return res
+
+def wpas_get_handover_req_wps():
+ wpas = wpas_connect()
+ if (wpas == None):
+ return None
+ return wpas.request("NFC_GET_HANDOVER_REQ NDEF WPS-CR").rstrip().decode("hex")
+
+
+def wpas_get_handover_sel(tag=False):
+ wpas = wpas_connect()
+ if (wpas == None):
+ return None
+ if tag:
+ return wpas.request("NFC_GET_HANDOVER_SEL NDEF P2P-CR-TAG").rstrip().decode("hex")
+ return wpas.request("NFC_GET_HANDOVER_SEL NDEF P2P-CR").rstrip().decode("hex")
+
+
+def wpas_get_handover_sel_wps():
+ wpas = wpas_connect()
+ if (wpas == None):
+ return None
+ res = wpas.request("NFC_GET_HANDOVER_SEL NDEF WPS-CR");
+ if "FAIL" in res:
+ return None
+ return res.rstrip().decode("hex")
+
+
+def wpas_report_handover(req, sel, type):
+ wpas = wpas_connect()
+ if (wpas == None):
+ return None
+ cmd = "NFC_REPORT_HANDOVER " + type + " P2P " + str(req).encode("hex") + " " + str(sel).encode("hex")
+ global force_freq
+ if force_freq:
+ cmd = cmd + " freq=" + force_freq
+ return wpas.request(cmd)
+
+
+def wpas_report_handover_wsc(req, sel, type):
+ wpas = wpas_connect()
+ if (wpas == None):
+ return None
+ cmd = "NFC_REPORT_HANDOVER " + type + " WPS " + str(req).encode("hex") + " " + str(sel).encode("hex")
+ if force_freq:
+ cmd = cmd + " freq=" + force_freq
+ return wpas.request(cmd)
+
+
+def p2p_handover_client(llc):
+ message = nfc.ndef.HandoverRequestMessage(version="1.2")
+ message.nonce = random.randint(0, 0xffff)
+
+ global include_p2p_req
+ if include_p2p_req:
+ data = wpas_get_handover_req()
+ if (data == None):
+ print "Could not get handover request carrier record from wpa_supplicant"
+ return
+ print "Handover request carrier record from wpa_supplicant: " + data.encode("hex")
+ datamsg = nfc.ndef.Message(data)
+ message.add_carrier(datamsg[0], "active", datamsg[1:])
+
+ global include_wps_req
+ if include_wps_req:
+ print "Handover request (pre-WPS):"
+ try:
+ print message.pretty()
+ except Exception, e:
+ print e
+
+ data = wpas_get_handover_req_wps()
+ if data:
+ print "Add WPS request in addition to P2P"
+ datamsg = nfc.ndef.Message(data)
+ message.add_carrier(datamsg[0], "active", datamsg[1:])
+
+ print "Handover request:"
+ try:
+ print message.pretty()
+ except Exception, e:
+ print e
+ print str(message).encode("hex")
+
+ client = nfc.handover.HandoverClient(llc)
+ try:
+ print "Trying handover";
+ client.connect()
+ print "Connected for handover"
+ except nfc.llcp.ConnectRefused:
+ print "Handover connection refused"
+ client.close()
+ return
+ except Exception, e:
+ print "Other exception: " + str(e)
+ client.close()
+ return
+
+ print "Sending handover request"
+
+ if not client.send(message):
+ print "Failed to send handover request"
+
+ print "Receiving handover response"
+ message = client._recv()
+ if message is None:
+ print "No response received"
+ client.close()
+ return
+ if message.type != "urn:nfc:wkt:Hs":
+ print "Response was not Hs - received: " + message.type
+ client.close()
+ return
+
+ print "Received message"
+ try:
+ print message.pretty()
+ except Exception, e:
+ print e
+ print str(message).encode("hex")
+ message = nfc.ndef.HandoverSelectMessage(message)
+ print "Handover select received"
+ try:
+ print message.pretty()
+ except Exception, e:
+ print e
+
+ for carrier in message.carriers:
+ print "Remote carrier type: " + carrier.type
+ if carrier.type == "application/vnd.wfa.p2p":
+ print "P2P carrier type match - send to wpa_supplicant"
+ wpas_report_handover(data, carrier.record, "INIT")
+ break
+
+ print "Remove peer"
+ client.close()
+ print "Done with handover"
+ global only_one
+ if only_one:
+ print "only_one -> stop loop"
+ global continue_loop
+ continue_loop = False
+
+ global no_wait
+ if no_wait:
+ print "Trying to exit.."
+ global terminate_now
+ terminate_now = True
+
+
+class HandoverServer(nfc.handover.HandoverServer):
+ def __init__(self, llc):
+ super(HandoverServer, self).__init__(llc)
+ self.sent_carrier = None
+ self.ho_server_processing = False
+ self.success = False
+
+ def process_request(self, request):
+ self.ho_server_processing = True
+ clear_raw_mode()
+ print "HandoverServer - request received"
+ try:
+ print "Parsed handover request: " + request.pretty()
+ except Exception, e:
+ print e
+
+ sel = nfc.ndef.HandoverSelectMessage(version="1.2")
+
+ found = False
+
+ for carrier in request.carriers:
+ print "Remote carrier type: " + carrier.type
+ if carrier.type == "application/vnd.wfa.p2p":
+ print "P2P carrier type match - add P2P carrier record"
+ found = True
+ self.received_carrier = carrier.record
+ print "Carrier record:"
+ try:
+ print carrier.record.pretty()
+ except Exception, e:
+ print e
+ data = wpas_get_handover_sel()
+ if data is None:
+ print "Could not get handover select carrier record from wpa_supplicant"
+ continue
+ print "Handover select carrier record from wpa_supplicant:"
+ print data.encode("hex")
+ self.sent_carrier = data
+ wpas_report_handover(self.received_carrier, self.sent_carrier,
+ "RESP")
+
+ message = nfc.ndef.Message(data);
+ sel.add_carrier(message[0], "active", message[1:])
+ break
+
+ for carrier in request.carriers:
+ if found:
+ break
+ print "Remote carrier type: " + carrier.type
+ if carrier.type == "application/vnd.wfa.wsc":
+ print "WSC carrier type match - add WSC carrier record"
+ found = True
+ self.received_carrier = carrier.record
+ print "Carrier record:"
+ try:
+ print carrier.record.pretty()
+ except Exception, e:
+ print e
+ data = wpas_get_handover_sel_wps()
+ if data is None:
+ print "Could not get handover select carrier record from wpa_supplicant"
+ continue
+ print "Handover select carrier record from wpa_supplicant:"
+ print data.encode("hex")
+ self.sent_carrier = data
+ wpas_report_handover_wsc(self.received_carrier,
+ self.sent_carrier, "RESP")
+
+ message = nfc.ndef.Message(data);
+ sel.add_carrier(message[0], "active", message[1:])
+ found = True
+ break
+
+ print "Handover select:"
+ try:
+ print sel.pretty()
+ except Exception, e:
+ print e
+ print str(sel).encode("hex")
+
+ print "Sending handover select"
+ self.success = True
+ return sel
+
+
+def clear_raw_mode():
+ import sys, tty, termios
+ global prev_tcgetattr, in_raw_mode
+ if not in_raw_mode:
+ return
+ fd = sys.stdin.fileno()
+ termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr)
+ in_raw_mode = False
+
+
+def getch():
+ import sys, tty, termios, select
+ global prev_tcgetattr, in_raw_mode
+ fd = sys.stdin.fileno()
+ prev_tcgetattr = termios.tcgetattr(fd)
+ ch = None
+ try:
+ tty.setraw(fd)
+ in_raw_mode = True
+ [i, o, e] = select.select([fd], [], [], 0.05)
+ if i:
+ ch = sys.stdin.read(1)
+ finally:
+ termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr)
+ in_raw_mode = False
+ return ch
+
+
+def p2p_tag_read(tag):
+ success = False
+ if len(tag.ndef.message):
+ for record in tag.ndef.message:
+ print "record type " + record.type
+ if record.type == "application/vnd.wfa.wsc":
+ print "WPS tag - send to wpa_supplicant"
+ success = wpas_tag_read(tag.ndef.message)
+ break
+ if record.type == "application/vnd.wfa.p2p":
+ print "P2P tag - send to wpa_supplicant"
+ success = wpas_tag_read(tag.ndef.message)
+ break
+ else:
+ print "Empty tag"
+
+ return success
+
+
+def rdwr_connected_p2p_write(tag):
+ print "Tag found - writing"
+ global p2p_sel_data
+ tag.ndef.message = str(p2p_sel_data)
+ print "Done - remove tag"
+ global only_one
+ if only_one:
+ global continue_loop
+ continue_loop = False
+ global p2p_sel_wait_remove
+ return p2p_sel_wait_remove
+
+def wps_write_p2p_handover_sel(clf, wait_remove=True):
+ print "Write P2P handover select"
+ data = wpas_get_handover_sel(tag=True)
+ if (data == None):
+ print "Could not get P2P handover select from wpa_supplicant"
+ return
+
+ global p2p_sel_wait_remove
+ p2p_sel_wait_remove = wait_remove
+ global p2p_sel_data
+ p2p_sel_data = nfc.ndef.HandoverSelectMessage(version="1.2")
+ message = nfc.ndef.Message(data);
+ p2p_sel_data.add_carrier(message[0], "active", message[1:])
+ print "Handover select:"
+ try:
+ print p2p_sel_data.pretty()
+ except Exception, e:
+ print e
+ print str(p2p_sel_data).encode("hex")
+
+ print "Touch an NFC tag"
+ clf.connect(rdwr={'on-connect': rdwr_connected_p2p_write})
+
+
+def rdwr_connected(tag):
+ global only_one, no_wait
+ print "Tag connected: " + str(tag)
+
+ if tag.ndef:
+ print "NDEF tag: " + tag.type
+ try:
+ print tag.ndef.message.pretty()
+ except Exception, e:
+ print e
+ success = p2p_tag_read(tag)
+ if only_one and success:
+ global continue_loop
+ continue_loop = False
+ else:
+ print "Not an NDEF tag - remove tag"
+
+ return not no_wait
+
+
+def llcp_worker(llc):
+ global init_on_touch
+ if init_on_touch:
+ print "Starting handover client"
+ p2p_handover_client(llc)
+ return
+
+ global no_input
+ if no_input:
+ print "Wait for handover to complete"
+ else:
+ print "Wait for handover to complete - press 'i' to initiate ('w' for WPS only, 'p' for P2P only)"
+ global srv
+ global wait_connection
+ while not wait_connection and srv.sent_carrier is None:
+ if srv.ho_server_processing:
+ time.sleep(0.025)
+ elif no_input:
+ time.sleep(0.5)
+ else:
+ global include_wps_req, include_p2p_req
+ res = getch()
+ if res == 'i':
+ include_wps_req = True
+ include_p2p_req = True
+ elif res == 'p':
+ include_wps_req = False
+ include_p2p_req = True
+ elif res == 'w':
+ include_wps_req = True
+ include_p2p_req = False
+ else:
+ continue
+ clear_raw_mode()
+ print "Starting handover client"
+ p2p_handover_client(llc)
+ return
+
+ clear_raw_mode()
+ print "Exiting llcp_worker thread"
+
+def llcp_startup(clf, llc):
+ print "Start LLCP server"
+ global srv
+ srv = HandoverServer(llc)
+ return llc
+
+def llcp_connected(llc):
+ print "P2P LLCP connected"
+ global wait_connection
+ wait_connection = False
+ global init_on_touch
+ if not init_on_touch:
+ global srv
+ srv.start()
+ if init_on_touch or not no_input:
+ threading.Thread(target=llcp_worker, args=(llc,)).start()
+ return True
+
+def terminate_loop():
+ global terminate_now
+ return terminate_now
+
+def main():
+ clf = nfc.ContactlessFrontend()
+
+ parser = argparse.ArgumentParser(description='nfcpy to wpa_supplicant integration for P2P and WPS NFC operations')
+ parser.add_argument('-d', const=logging.DEBUG, default=logging.INFO,
+ action='store_const', dest='loglevel',
+ help='verbose debug output')
+ parser.add_argument('-q', const=logging.WARNING, action='store_const',
+ dest='loglevel', help='be quiet')
+ parser.add_argument('--only-one', '-1', action='store_true',
+ help='run only one operation and exit')
+ parser.add_argument('--init-on-touch', '-I', action='store_true',
+ help='initiate handover on touch')
+ parser.add_argument('--no-wait', action='store_true',
+ help='do not wait for tag to be removed before exiting')
+ parser.add_argument('--ifname', '-i',
+ help='network interface name')
+ parser.add_argument('--no-wps-req', '-N', action='store_true',
+ help='do not include WPS carrier record in request')
+ parser.add_argument('--no-input', '-a', action='store_true',
+ help='do not use stdout input to initiate handover')
+ parser.add_argument('--tag-read-only', '-t', action='store_true',
+ help='tag read only (do not allow connection handover)')
+ parser.add_argument('--freq', '-f',
+ help='forced frequency of operating channel in MHz')
+ parser.add_argument('command', choices=['write-p2p-sel'],
+ nargs='?')
+ args = parser.parse_args()
+
+ global only_one
+ only_one = args.only_one
+
+ global no_wait
+ no_wait = args.no_wait
+
+ global force_freq
+ force_freq = args.freq
+
+ logging.basicConfig(level=args.loglevel)
+
+ global init_on_touch
+ init_on_touch = args.init_on_touch
+
+ if args.ifname:
+ global ifname
+ ifname = args.ifname
+ print "Selected ifname " + ifname
+
+ if args.no_wps_req:
+ global include_wps_req
+ include_wps_req = False
+
+ if args.no_input:
+ global no_input
+ no_input = True
+
+ clf = nfc.ContactlessFrontend()
+ global wait_connection
+
+ try:
+ 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()