1#!/usr/bin/python3 2# 3# Example nfcpy to wpa_supplicant wrapper for DPP NFC operations 4# Copyright (c) 2012-2013, Jouni Malinen <j@w1.fi> 5# Copyright (c) 2019-2020, The Linux Foundation 6# 7# This software may be distributed under the terms of the BSD license. 8# See README for more details. 9 10import binascii 11import errno 12import os 13import struct 14import sys 15import time 16import threading 17import argparse 18 19import nfc 20import ndef 21 22import logging 23 24scriptsdir = os.path.dirname(os.path.realpath(sys.modules[__name__].__file__)) 25sys.path.append(os.path.join(scriptsdir, '..', '..', 'wpaspy')) 26import wpaspy 27 28wpas_ctrl = '/var/run/wpa_supplicant' 29ifname = None 30init_on_touch = False 31in_raw_mode = False 32prev_tcgetattr = 0 33no_input = False 34continue_loop = True 35terminate_now = False 36summary_file = None 37success_file = None 38netrole = None 39operation_success = False 40mutex = threading.Lock() 41 42C_NORMAL = '\033[0m' 43C_RED = '\033[91m' 44C_GREEN = '\033[92m' 45C_YELLOW = '\033[93m' 46C_BLUE = '\033[94m' 47C_MAGENTA = '\033[95m' 48C_CYAN = '\033[96m' 49 50def summary(txt, color=None): 51 with mutex: 52 if color: 53 print(color + txt + C_NORMAL) 54 else: 55 print(txt) 56 if summary_file: 57 with open(summary_file, 'a') as f: 58 f.write(txt + "\n") 59 60def success_report(txt): 61 summary(txt) 62 if success_file: 63 with open(success_file, 'a') as f: 64 f.write(txt + "\n") 65 66def wpas_connect(): 67 ifaces = [] 68 if os.path.isdir(wpas_ctrl): 69 try: 70 ifaces = [os.path.join(wpas_ctrl, i) for i in os.listdir(wpas_ctrl)] 71 except OSError as error: 72 summary("Could not find wpa_supplicant: %s", str(error)) 73 return None 74 75 if len(ifaces) < 1: 76 summary("No wpa_supplicant control interface found") 77 return None 78 79 for ctrl in ifaces: 80 if ifname and ifname not in ctrl: 81 continue 82 if os.path.basename(ctrl).startswith("p2p-dev-"): 83 # skip P2P management interface 84 continue 85 try: 86 summary("Trying to use control interface " + ctrl) 87 wpas = wpaspy.Ctrl(ctrl) 88 return wpas 89 except Exception as e: 90 pass 91 summary("Could not connect to wpa_supplicant") 92 return None 93 94def dpp_nfc_uri_process(uri): 95 wpas = wpas_connect() 96 if wpas is None: 97 return False 98 peer_id = wpas.request("DPP_NFC_URI " + uri) 99 if "FAIL" in peer_id: 100 summary("Could not parse DPP URI from NFC URI record", color=C_RED) 101 return False 102 peer_id = int(peer_id) 103 summary("peer_id=%d for URI from NFC Tag: %s" % (peer_id, uri)) 104 cmd = "DPP_AUTH_INIT peer=%d" % peer_id 105 global enrollee_only, configurator_only, config_params 106 if enrollee_only: 107 cmd += " role=enrollee" 108 elif configurator_only: 109 cmd += " role=configurator" 110 if config_params: 111 cmd += " " + config_params 112 summary("Initiate DPP authentication: " + cmd) 113 res = wpas.request(cmd) 114 if "OK" not in res: 115 summary("Failed to initiate DPP Authentication", color=C_RED) 116 return False 117 summary("DPP Authentication initiated") 118 return True 119 120def dpp_hs_tag_read(record): 121 wpas = wpas_connect() 122 if wpas is None: 123 return False 124 summary(record) 125 if len(record.data) < 5: 126 summary("Too short DPP HS", color=C_RED) 127 return False 128 if record.data[0] != 0: 129 summary("Unexpected URI Identifier Code", color=C_RED) 130 return False 131 uribuf = record.data[1:] 132 try: 133 uri = uribuf.decode() 134 except: 135 summary("Invalid URI payload", color=C_RED) 136 return False 137 summary("URI: " + uri) 138 if not uri.startswith("DPP:"): 139 summary("Not a DPP URI", color=C_RED) 140 return False 141 return dpp_nfc_uri_process(uri) 142 143def get_status(wpas, extra=None): 144 if extra: 145 extra = "-" + extra 146 else: 147 extra = "" 148 res = wpas.request("STATUS" + extra) 149 lines = res.splitlines() 150 vals = dict() 151 for l in lines: 152 try: 153 [name, value] = l.split('=', 1) 154 except ValueError: 155 summary("Ignore unexpected status line: %s" % l) 156 continue 157 vals[name] = value 158 return vals 159 160def get_status_field(wpas, field, extra=None): 161 vals = get_status(wpas, extra) 162 if field in vals: 163 return vals[field] 164 return None 165 166def own_addr(wpas): 167 addr = get_status_field(wpas, "address") 168 if addr is None: 169 addr = get_status_field(wpas, "bssid[0]") 170 return addr 171 172def dpp_bootstrap_gen(wpas, type="qrcode", chan=None, mac=None, info=None, 173 curve=None, key=None): 174 cmd = "DPP_BOOTSTRAP_GEN type=" + type 175 if chan: 176 cmd += " chan=" + chan 177 if mac: 178 if mac is True: 179 mac = own_addr(wpas) 180 if mac is None: 181 summary("Could not determine local MAC address for bootstrap info") 182 else: 183 cmd += " mac=" + mac.replace(':', '') 184 if info: 185 cmd += " info=" + info 186 if curve: 187 cmd += " curve=" + curve 188 if key: 189 cmd += " key=" + key 190 res = wpas.request(cmd) 191 if "FAIL" in res: 192 raise Exception("Failed to generate bootstrapping info") 193 return int(res) 194 195def dpp_start_listen(wpas, freq): 196 if get_status_field(wpas, "bssid[0]"): 197 summary("Own AP freq: %s MHz" % str(get_status_field(wpas, "freq"))) 198 if get_status_field(wpas, "beacon_set", extra="DRIVER") is None: 199 summary("Enable beaconing to have radio ready for RX") 200 wpas.request("DISABLE") 201 wpas.request("SET start_disabled 0") 202 wpas.request("ENABLE") 203 cmd = "DPP_LISTEN %d" % freq 204 global enrollee_only 205 global configurator_only 206 if enrollee_only: 207 cmd += " role=enrollee" 208 elif configurator_only: 209 cmd += " role=configurator" 210 global netrole 211 if netrole: 212 cmd += " netrole=" + netrole 213 summary(cmd) 214 res = wpas.request(cmd) 215 if "OK" not in res: 216 summary("Failed to start DPP listen", color=C_RED) 217 return False 218 return True 219 220def wpas_get_nfc_uri(start_listen=True, pick_channel=False, chan_override=None): 221 listen_freq = 2412 222 wpas = wpas_connect() 223 if wpas is None: 224 return None 225 global own_id, chanlist 226 if chan_override: 227 chan = chan_override 228 else: 229 chan = chanlist 230 if chan and chan.startswith("81/"): 231 listen_freq = int(chan[3:].split(',')[0]) * 5 + 2407 232 if chan is None and get_status_field(wpas, "bssid[0]"): 233 freq = get_status_field(wpas, "freq") 234 if freq: 235 freq = int(freq) 236 if freq >= 2412 and freq <= 2462: 237 chan = "81/%d" % ((freq - 2407) / 5) 238 summary("Use current AP operating channel (%d MHz) as the URI channel list (%s)" % (freq, chan)) 239 listen_freq = freq 240 if chan is None and pick_channel: 241 chan = "81/6" 242 summary("Use channel 2437 MHz since no other preference provided") 243 listen_freq = 2437 244 own_id = dpp_bootstrap_gen(wpas, type="nfc-uri", chan=chan, mac=True) 245 res = wpas.request("DPP_BOOTSTRAP_GET_URI %d" % own_id).rstrip() 246 if "FAIL" in res: 247 return None 248 if start_listen: 249 if not dpp_start_listen(wpas, listen_freq): 250 raise Exception("Failed to start listen operation on %d MHz" % listen_freq) 251 return res 252 253def wpas_report_handover_req(uri): 254 wpas = wpas_connect() 255 if wpas is None: 256 return None 257 global own_id 258 cmd = "DPP_NFC_HANDOVER_REQ own=%d uri=%s" % (own_id, uri) 259 return wpas.request(cmd) 260 261def wpas_report_handover_sel(uri): 262 wpas = wpas_connect() 263 if wpas is None: 264 return None 265 global own_id 266 cmd = "DPP_NFC_HANDOVER_SEL own=%d uri=%s" % (own_id, uri) 267 return wpas.request(cmd) 268 269def dpp_handover_client(handover, alt=False): 270 summary("About to start run_dpp_handover_client (alt=%s)" % str(alt)) 271 if alt: 272 handover.i_m_selector = False 273 run_dpp_handover_client(handover, alt) 274 summary("Done run_dpp_handover_client (alt=%s)" % str(alt)) 275 276def run_client_alt(handover, alt): 277 if handover.start_client_alt and not alt: 278 handover.start_client_alt = False 279 summary("Try to send alternative handover request") 280 dpp_handover_client(handover, alt=True) 281 282class HandoverClient(nfc.handover.HandoverClient): 283 def __init__(self, handover, llc): 284 super(HandoverClient, self).__init__(llc) 285 self.handover = handover 286 287 def recv_records(self, timeout=None): 288 msg = self.recv_octets(timeout) 289 if msg is None: 290 return None 291 records = list(ndef.message_decoder(msg, 'relax')) 292 if records and records[0].type == 'urn:nfc:wkt:Hs': 293 summary("Handover client received message '{0}'".format(records[0].type)) 294 return list(ndef.message_decoder(msg, 'relax')) 295 summary("Handover client received invalid message: %s" + binascii.hexlify(msg)) 296 return None 297 298 def recv_octets(self, timeout=None): 299 start = time.time() 300 msg = bytearray() 301 while True: 302 poll_timeout = 0.1 if timeout is None or timeout > 0.1 else timeout 303 if not self.socket.poll('recv', poll_timeout): 304 if timeout: 305 timeout -= time.time() - start 306 if timeout <= 0: 307 return None 308 start = time.time() 309 continue 310 try: 311 r = self.socket.recv() 312 if r is None: 313 return None 314 msg += r 315 except TypeError: 316 return b'' 317 try: 318 list(ndef.message_decoder(msg, 'strict', {})) 319 return bytes(msg) 320 except ndef.DecodeError: 321 if timeout: 322 timeout -= time.time() - start 323 if timeout <= 0: 324 return None 325 start = time.time() 326 continue 327 return None 328 329def run_dpp_handover_client(handover, alt=False): 330 chan_override = None 331 if alt: 332 chan_override = handover.altchanlist 333 handover.alt_proposal_used = True 334 global test_uri, test_alt_uri 335 if test_uri: 336 summary("TEST MODE: Using specified URI (alt=%s)" % str(alt)) 337 uri = test_alt_uri if alt else test_uri 338 else: 339 uri = wpas_get_nfc_uri(start_listen=False, chan_override=chan_override) 340 if uri is None: 341 summary("Cannot start handover client - no bootstrap URI available", 342 color=C_RED) 343 return 344 handover.my_uri = uri 345 uri = ndef.UriRecord(uri) 346 summary("NFC URI record for DPP: " + str(uri)) 347 carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data) 348 global test_crn 349 if test_crn: 350 prev, = struct.unpack('>H', test_crn) 351 summary("TEST MODE: Use specified crn %d" % prev) 352 crn = test_crn 353 test_crn = struct.pack('>H', prev + 0x10) 354 else: 355 crn = os.urandom(2) 356 hr = ndef.HandoverRequestRecord(version="1.4", crn=crn) 357 hr.add_alternative_carrier('active', carrier.name) 358 message = [hr, carrier] 359 summary("NFC Handover Request message for DPP: " + str(message)) 360 361 if handover.peer_crn is not None and not alt: 362 summary("NFC handover request from peer was already received - do not send own") 363 return 364 if handover.client: 365 summary("Use already started handover client") 366 client = handover.client 367 else: 368 summary("Start handover client") 369 client = HandoverClient(handover, handover.llc) 370 try: 371 summary("Trying to initiate NFC connection handover") 372 client.connect() 373 summary("Connected for handover") 374 except nfc.llcp.ConnectRefused: 375 summary("Handover connection refused") 376 client.close() 377 return 378 except Exception as e: 379 summary("Other exception: " + str(e)) 380 client.close() 381 return 382 handover.client = client 383 384 if handover.peer_crn is not None and not alt: 385 summary("NFC handover request from peer was already received - do not send own") 386 return 387 388 summary("Sending handover request") 389 390 handover.my_crn_ready = True 391 392 if not client.send_records(message): 393 handover.my_crn_ready = False 394 summary("Failed to send handover request", color=C_RED) 395 run_client_alt(handover, alt) 396 return 397 398 handover.my_crn, = struct.unpack('>H', crn) 399 400 summary("Receiving handover response") 401 try: 402 start = time.time() 403 message = client.recv_records(timeout=3.0) 404 end = time.time() 405 summary("Received {} record(s) in {} seconds".format(len(message) if message is not None else -1, end - start)) 406 except Exception as e: 407 # This is fine if we are the handover selector 408 if handover.hs_sent: 409 summary("Client receive failed as expected since I'm the handover server: %s" % str(e)) 410 elif handover.alt_proposal_used and not alt: 411 summary("Client received failed for initial proposal as expected since alternative proposal was also used: %s" % str(e)) 412 else: 413 summary("Client receive failed: %s" % str(e), color=C_RED) 414 message = None 415 if message is None: 416 if handover.hs_sent: 417 summary("No response received as expected since I'm the handover server") 418 elif handover.alt_proposal_used and not alt: 419 summary("No response received for initial proposal as expected since alternative proposal was also used") 420 elif handover.try_own and not alt: 421 summary("No response received for initial proposal as expected since alternative proposal will also be sent") 422 else: 423 summary("No response received", color=C_RED) 424 run_client_alt(handover, alt) 425 return 426 summary("Received message: " + str(message)) 427 if len(message) < 1 or \ 428 not isinstance(message[0], ndef.HandoverSelectRecord): 429 summary("Response was not Hs - received: " + message.type) 430 return 431 432 summary("Received handover select message") 433 summary("alternative carriers: " + str(message[0].alternative_carriers)) 434 if handover.i_m_selector: 435 summary("Ignore the received select since I'm the handover selector") 436 run_client_alt(handover, alt) 437 return 438 439 if handover.alt_proposal_used and not alt: 440 summary("Ignore received handover select for the initial proposal since alternative proposal was sent") 441 client.close() 442 return 443 444 dpp_found = False 445 for carrier in message: 446 if isinstance(carrier, ndef.HandoverSelectRecord): 447 continue 448 summary("Remote carrier type: " + carrier.type) 449 if carrier.type == "application/vnd.wfa.dpp": 450 if len(carrier.data) == 0 or carrier.data[0] != 0: 451 summary("URI Identifier Code 'None' not seen", color=C_RED) 452 continue 453 summary("DPP carrier type match - send to wpa_supplicant") 454 dpp_found = True 455 uri = carrier.data[1:].decode("utf-8") 456 summary("DPP URI: " + uri) 457 handover.peer_uri = uri 458 if test_uri: 459 summary("TEST MODE: Fake processing") 460 break 461 res = wpas_report_handover_sel(uri) 462 if res is None or "FAIL" in res: 463 summary("DPP handover report rejected", color=C_RED) 464 break 465 466 success_report("DPP handover reported successfully (initiator)") 467 summary("peer_id=" + res) 468 peer_id = int(res) 469 wpas = wpas_connect() 470 if wpas is None: 471 break 472 473 global enrollee_only 474 global config_params 475 if enrollee_only: 476 extra = " role=enrollee" 477 elif config_params: 478 extra = " role=configurator " + config_params 479 else: 480 # TODO: Single Configurator instance 481 res = wpas.request("DPP_CONFIGURATOR_ADD") 482 if "FAIL" in res: 483 summary("Failed to initiate Configurator", color=C_RED) 484 break 485 conf_id = int(res) 486 extra = " conf=sta-dpp configurator=%d" % conf_id 487 global own_id 488 summary("Initiate DPP authentication") 489 cmd = "DPP_AUTH_INIT peer=%d own=%d" % (peer_id, own_id) 490 cmd += extra 491 res = wpas.request(cmd) 492 if "FAIL" in res: 493 summary("Failed to initiate DPP authentication", color=C_RED) 494 break 495 496 if not dpp_found and handover.no_alt_proposal: 497 summary("DPP carrier not seen in response - do not allow alternative proposal anymore") 498 elif not dpp_found: 499 summary("DPP carrier not seen in response - allow peer to initiate a new handover with different parameters") 500 handover.alt_proposal = True 501 handover.my_crn_ready = False 502 handover.my_crn = None 503 handover.peer_crn = None 504 handover.hs_sent = False 505 summary("Returning from dpp_handover_client") 506 return 507 508 summary("Remove peer") 509 handover.close() 510 summary("Done with handover") 511 global only_one 512 if only_one: 513 print("only_one -> stop loop") 514 global continue_loop 515 continue_loop = False 516 517 global no_wait 518 if no_wait or only_one: 519 summary("Trying to exit..") 520 global terminate_now 521 terminate_now = True 522 523 summary("Returning from dpp_handover_client") 524 525class HandoverServer(nfc.handover.HandoverServer): 526 def __init__(self, handover, llc): 527 super(HandoverServer, self).__init__(llc) 528 self.sent_carrier = None 529 self.ho_server_processing = False 530 self.success = False 531 self.llc = llc 532 self.handover = handover 533 534 def serve(self, socket): 535 peer_sap = socket.getpeername() 536 summary("Serving handover client on remote sap {0}".format(peer_sap)) 537 send_miu = socket.getsockopt(nfc.llcp.SO_SNDMIU) 538 try: 539 while socket.poll("recv"): 540 req = bytearray() 541 while socket.poll("recv"): 542 r = socket.recv() 543 if r is None: 544 return None 545 summary("Received %d octets" % len(r)) 546 req += r 547 if len(req) == 0: 548 continue 549 try: 550 list(ndef.message_decoder(req, 'strict', {})) 551 except ndef.DecodeError: 552 continue 553 summary("Full message received") 554 resp = self._process_request_data(req) 555 if resp is None or len(resp) == 0: 556 summary("No handover select to send out - wait for a possible alternative handover request") 557 handover.alt_proposal = True 558 req = bytearray() 559 continue 560 561 for offset in range(0, len(resp), send_miu): 562 if not socket.send(resp[offset:offset + send_miu]): 563 summary("Failed to send handover select - connection closed") 564 return 565 summary("Sent out full handover select") 566 if handover.terminate_on_hs_send_completion: 567 handover.delayed_exit() 568 569 except nfc.llcp.Error as e: 570 global terminate_now 571 summary("HandoverServer exception: %s" % e, 572 color=None if e.errno == errno.EPIPE or terminate_now else C_RED) 573 finally: 574 socket.close() 575 summary("Handover serve thread exiting") 576 577 def process_handover_request_message(self, records): 578 handover = self.handover 579 self.ho_server_processing = True 580 global in_raw_mode 581 was_in_raw_mode = in_raw_mode 582 clear_raw_mode() 583 if was_in_raw_mode: 584 print("\n") 585 summary("HandoverServer - request received: " + str(records)) 586 587 for carrier in records: 588 if not isinstance(carrier, ndef.HandoverRequestRecord): 589 continue 590 if carrier.collision_resolution_number: 591 handover.peer_crn = carrier.collision_resolution_number 592 summary("peer_crn: %d" % handover.peer_crn) 593 594 if handover.my_crn is None and handover.my_crn_ready: 595 summary("Still trying to send own handover request - wait a moment to see if that succeeds before checking crn values") 596 for i in range(10): 597 if handover.my_crn is not None: 598 break 599 time.sleep(0.01) 600 if handover.my_crn is not None: 601 summary("my_crn: %d" % handover.my_crn) 602 603 if handover.my_crn is not None and handover.peer_crn is not None: 604 if handover.my_crn == handover.peer_crn: 605 summary("Same crn used - automatic collision resolution failed") 606 # TODO: Should generate a new Handover Request message 607 return '' 608 if ((handover.my_crn & 1) == (handover.peer_crn & 1) and \ 609 handover.my_crn > handover.peer_crn) or \ 610 ((handover.my_crn & 1) != (handover.peer_crn & 1) and \ 611 handover.my_crn < handover.peer_crn): 612 summary("I'm the Handover Selector Device") 613 handover.i_m_selector = True 614 else: 615 summary("Peer is the Handover Selector device") 616 summary("Ignore the received request.") 617 return '' 618 619 hs = ndef.HandoverSelectRecord('1.4') 620 sel = [hs] 621 622 found = False 623 624 for carrier in records: 625 if isinstance(carrier, ndef.HandoverRequestRecord): 626 continue 627 summary("Remote carrier type: " + carrier.type) 628 if carrier.type == "application/vnd.wfa.dpp": 629 summary("DPP carrier type match - add DPP carrier record") 630 if len(carrier.data) == 0 or carrier.data[0] != 0: 631 summary("URI Identifier Code 'None' not seen", color=C_RED) 632 continue 633 uri = carrier.data[1:].decode("utf-8") 634 summary("Received DPP URI: " + uri) 635 636 global test_uri, test_alt_uri 637 if test_uri: 638 summary("TEST MODE: Using specified URI") 639 data = test_sel_uri if test_sel_uri else test_uri 640 elif handover.alt_proposal and handover.altchanlist: 641 summary("Use alternative channel list while processing alternative proposal from peer") 642 data = wpas_get_nfc_uri(start_listen=False, 643 chan_override=handover.altchanlist, 644 pick_channel=True) 645 else: 646 data = wpas_get_nfc_uri(start_listen=False, 647 pick_channel=True) 648 summary("Own URI (pre-processing): %s" % data) 649 650 if test_uri: 651 summary("TEST MODE: Fake processing") 652 res = "OK" 653 data += " [%s]" % uri 654 else: 655 res = wpas_report_handover_req(uri) 656 if res is None or "FAIL" in res: 657 summary("DPP handover request processing failed", 658 color=C_RED) 659 if handover.altchanlist: 660 data = wpas_get_nfc_uri(start_listen=False, 661 chan_override=handover.altchanlist) 662 summary("Own URI (try another channel list): %s" % data) 663 continue 664 665 if test_alt_uri: 666 summary("TEST MODE: Reject initial proposal") 667 continue 668 669 found = True 670 671 if not test_uri: 672 wpas = wpas_connect() 673 if wpas is None: 674 continue 675 global own_id 676 data = wpas.request("DPP_BOOTSTRAP_GET_URI %d" % own_id).rstrip() 677 if "FAIL" in data: 678 continue 679 summary("Own URI (post-processing): %s" % data) 680 handover.my_uri = data 681 handover.peer_uri = uri 682 uri = ndef.UriRecord(data) 683 summary("Own bootstrapping NFC URI record: " + str(uri)) 684 685 if not test_uri: 686 info = wpas.request("DPP_BOOTSTRAP_INFO %d" % own_id) 687 freq = None 688 for line in info.splitlines(): 689 if line.startswith("use_freq="): 690 freq = int(line.split('=')[1]) 691 if freq is None or freq == 0: 692 summary("No channel negotiated over NFC - use channel 6") 693 freq = 2437 694 else: 695 summary("Negotiated channel: %d MHz" % freq) 696 if not dpp_start_listen(wpas, freq): 697 break 698 699 carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data) 700 summary("Own DPP carrier record: " + str(carrier)) 701 hs.add_alternative_carrier('active', carrier.name) 702 sel = [hs, carrier] 703 break 704 705 summary("Sending handover select: " + str(sel)) 706 if found: 707 summary("Handover completed successfully") 708 handover.terminate_on_hs_send_completion = True 709 self.success = True 710 handover.hs_sent = True 711 handover.i_m_selector = True 712 elif handover.no_alt_proposal: 713 summary("Do not try alternative proposal anymore - handover failed", 714 color=C_RED) 715 handover.hs_sent = True 716 else: 717 summary("Try to initiate with alternative parameters") 718 handover.try_own = True 719 handover.hs_sent = False 720 handover.no_alt_proposal = True 721 if handover.client_thread: 722 handover.start_client_alt = True 723 else: 724 handover.client_thread = threading.Thread(target=llcp_worker, 725 args=(self.llc, True)) 726 handover.client_thread.start() 727 return sel 728 729def clear_raw_mode(): 730 import sys, tty, termios 731 global prev_tcgetattr, in_raw_mode 732 if not in_raw_mode: 733 return 734 fd = sys.stdin.fileno() 735 termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr) 736 in_raw_mode = False 737 738def getch(): 739 import sys, tty, termios, select 740 global prev_tcgetattr, in_raw_mode 741 fd = sys.stdin.fileno() 742 prev_tcgetattr = termios.tcgetattr(fd) 743 ch = None 744 try: 745 tty.setraw(fd) 746 in_raw_mode = True 747 [i, o, e] = select.select([fd], [], [], 0.05) 748 if i: 749 ch = sys.stdin.read(1) 750 finally: 751 termios.tcsetattr(fd, termios.TCSADRAIN, prev_tcgetattr) 752 in_raw_mode = False 753 return ch 754 755def dpp_tag_read(tag): 756 success = False 757 for record in tag.ndef.records: 758 summary(record) 759 summary("record type " + record.type) 760 if record.type == "application/vnd.wfa.dpp": 761 summary("DPP HS tag - send to wpa_supplicant") 762 success = dpp_hs_tag_read(record) 763 break 764 if isinstance(record, ndef.UriRecord): 765 summary("URI record: uri=" + record.uri) 766 summary("URI record: iri=" + record.iri) 767 if record.iri.startswith("DPP:"): 768 summary("DPP URI") 769 if not dpp_nfc_uri_process(record.iri): 770 break 771 success = True 772 else: 773 summary("Ignore unknown URI") 774 break 775 776 if success: 777 success_report("Tag read succeeded") 778 779 return success 780 781def rdwr_connected_write_tag(tag): 782 summary("Tag found - writing - " + str(tag)) 783 if not tag.ndef: 784 summary("Not a formatted NDEF tag", color=C_RED) 785 return 786 if not tag.ndef.is_writeable: 787 summary("Not a writable tag", color=C_RED) 788 return 789 global dpp_tag_data 790 if tag.ndef.capacity < len(dpp_tag_data): 791 summary("Not enough room for the message") 792 return 793 try: 794 tag.ndef.records = dpp_tag_data 795 except ValueError as e: 796 summary("Writing the tag failed: %s" % str(e), color=C_RED) 797 return 798 success_report("Tag write succeeded") 799 summary("Tag writing completed - remove tag", color=C_GREEN) 800 global only_one, operation_success 801 operation_success = True 802 if only_one: 803 global continue_loop 804 continue_loop = False 805 global dpp_sel_wait_remove 806 return dpp_sel_wait_remove 807 808def write_nfc_uri(clf, wait_remove=True): 809 summary("Write NFC URI record") 810 data = wpas_get_nfc_uri() 811 if data is None: 812 summary("Could not get NFC URI from wpa_supplicant", color=C_RED) 813 return 814 815 global dpp_sel_wait_remove 816 dpp_sel_wait_remove = wait_remove 817 summary("URI: %s" % data) 818 uri = ndef.UriRecord(data) 819 summary(uri) 820 821 summary("Touch an NFC tag to write URI record", color=C_CYAN) 822 global dpp_tag_data 823 dpp_tag_data = [uri] 824 clf.connect(rdwr={'on-connect': rdwr_connected_write_tag}) 825 826def write_nfc_hs(clf, wait_remove=True): 827 summary("Write NFC Handover Select record on a tag") 828 data = wpas_get_nfc_uri() 829 if data is None: 830 summary("Could not get NFC URI from wpa_supplicant", color=C_RED) 831 return 832 833 global dpp_sel_wait_remove 834 dpp_sel_wait_remove = wait_remove 835 summary("URI: %s" % data) 836 uri = ndef.UriRecord(data) 837 summary(uri) 838 carrier = ndef.Record('application/vnd.wfa.dpp', 'A', uri.data) 839 hs = ndef.HandoverSelectRecord('1.4') 840 hs.add_alternative_carrier('active', carrier.name) 841 summary(hs) 842 summary(carrier) 843 844 summary("Touch an NFC tag to write HS record", color=C_CYAN) 845 global dpp_tag_data 846 dpp_tag_data = [hs, carrier] 847 summary(dpp_tag_data) 848 clf.connect(rdwr={'on-connect': rdwr_connected_write_tag}) 849 850def rdwr_connected(tag): 851 global only_one, no_wait 852 summary("Tag connected: " + str(tag)) 853 854 if tag.ndef: 855 summary("NDEF tag: " + tag.type) 856 summary(tag.ndef.records) 857 success = dpp_tag_read(tag) 858 if only_one and success: 859 global continue_loop 860 continue_loop = False 861 else: 862 summary("Not an NDEF tag - remove tag", color=C_RED) 863 return True 864 865 return not no_wait 866 867def llcp_worker(llc, try_alt): 868 global handover 869 print("Start of llcp_worker()") 870 if try_alt: 871 summary("Starting handover client (try_alt)") 872 dpp_handover_client(handover, alt=True) 873 summary("Exiting llcp_worker thread (try_alt)") 874 return 875 global init_on_touch 876 if init_on_touch: 877 summary("Starting handover client (init_on_touch)") 878 dpp_handover_client(handover) 879 summary("Exiting llcp_worker thread (init_on_touch)") 880 return 881 882 global no_input 883 if no_input: 884 summary("Wait for handover to complete") 885 else: 886 print("Wait for handover to complete - press 'i' to initiate") 887 while not handover.wait_connection and handover.srv.sent_carrier is None: 888 if handover.try_own: 889 handover.try_own = False 890 summary("Try to initiate another handover with own parameters") 891 handover.my_crn_ready = False 892 handover.my_crn = None 893 handover.peer_crn = None 894 handover.hs_sent = False 895 dpp_handover_client(handover, alt=True) 896 summary("Exiting llcp_worker thread (retry with own parameters)") 897 return 898 if handover.srv.ho_server_processing: 899 time.sleep(0.025) 900 elif no_input: 901 time.sleep(0.5) 902 else: 903 res = getch() 904 if res != 'i': 905 continue 906 clear_raw_mode() 907 summary("Starting handover client") 908 dpp_handover_client(handover) 909 summary("Exiting llcp_worker thread (manual init)") 910 return 911 912 global in_raw_mode 913 was_in_raw_mode = in_raw_mode 914 clear_raw_mode() 915 if was_in_raw_mode: 916 print("\r") 917 summary("Exiting llcp_worker thread") 918 919class ConnectionHandover(): 920 def __init__(self): 921 self.client = None 922 self.client_thread = None 923 self.reset() 924 self.exit_thread = None 925 926 def reset(self): 927 self.wait_connection = False 928 self.my_crn_ready = False 929 self.my_crn = None 930 self.peer_crn = None 931 self.hs_sent = False 932 self.no_alt_proposal = False 933 self.alt_proposal_used = False 934 self.i_m_selector = False 935 self.start_client_alt = False 936 self.terminate_on_hs_send_completion = False 937 self.try_own = False 938 self.my_uri = None 939 self.peer_uri = None 940 self.connected = False 941 self.alt_proposal = False 942 943 def start_handover_server(self, llc): 944 summary("Start handover server") 945 self.llc = llc 946 self.srv = HandoverServer(self, llc) 947 948 def close(self): 949 if self.client: 950 self.client.close() 951 self.client = None 952 953 def run_delayed_exit(self): 954 summary("Trying to exit (delayed)..") 955 time.sleep(0.25) 956 summary("Trying to exit (after wait)..") 957 global terminate_now 958 terminate_now = True 959 960 def delayed_exit(self): 961 global only_one 962 if only_one: 963 self.exit_thread = threading.Thread(target=self.run_delayed_exit) 964 self.exit_thread.start() 965 966def llcp_startup(llc): 967 global handover 968 handover.start_handover_server(llc) 969 return llc 970 971def llcp_connected(llc): 972 summary("P2P LLCP connected") 973 global handover 974 handover.connected = True 975 handover.srv.start() 976 if init_on_touch or not no_input: 977 handover.client_thread = threading.Thread(target=llcp_worker, 978 args=(llc, False)) 979 handover.client_thread.start() 980 return True 981 982def llcp_release(llc): 983 summary("LLCP release") 984 global handover 985 handover.close() 986 return True 987 988def terminate_loop(): 989 global terminate_now 990 return terminate_now 991 992def main(): 993 clf = nfc.ContactlessFrontend() 994 995 parser = argparse.ArgumentParser(description='nfcpy to wpa_supplicant integration for DPP NFC operations') 996 parser.add_argument('-d', const=logging.DEBUG, default=logging.INFO, 997 action='store_const', dest='loglevel', 998 help='verbose debug output') 999 parser.add_argument('-q', const=logging.WARNING, action='store_const', 1000 dest='loglevel', help='be quiet') 1001 parser.add_argument('--only-one', '-1', action='store_true', 1002 help='run only one operation and exit') 1003 parser.add_argument('--init-on-touch', '-I', action='store_true', 1004 help='initiate handover on touch') 1005 parser.add_argument('--no-wait', action='store_true', 1006 help='do not wait for tag to be removed before exiting') 1007 parser.add_argument('--ifname', '-i', 1008 help='network interface name') 1009 parser.add_argument('--no-input', '-a', action='store_true', 1010 help='do not use stdout input to initiate handover') 1011 parser.add_argument('--tag-read-only', '-t', action='store_true', 1012 help='tag read only (do not allow connection handover)') 1013 parser.add_argument('--handover-only', action='store_true', 1014 help='connection handover only (do not allow tag read)') 1015 parser.add_argument('--enrollee', action='store_true', 1016 help='run as Enrollee-only') 1017 parser.add_argument('--configurator', action='store_true', 1018 help='run as Configurator-only') 1019 parser.add_argument('--config-params', default='', 1020 help='configurator parameters') 1021 parser.add_argument('--ctrl', default='/var/run/wpa_supplicant', 1022 help='wpa_supplicant/hostapd control interface') 1023 parser.add_argument('--summary', 1024 help='summary file for writing status updates') 1025 parser.add_argument('--success', 1026 help='success file for writing success update') 1027 parser.add_argument('--device', default='usb', help='NFC device to open') 1028 parser.add_argument('--chan', default=None, help='channel list') 1029 parser.add_argument('--altchan', default=None, help='alternative channel list') 1030 parser.add_argument('--netrole', default=None, help='netrole for Enrollee') 1031 parser.add_argument('--test-uri', default=None, 1032 help='test mode: initial URI') 1033 parser.add_argument('--test-alt-uri', default=None, 1034 help='test mode: alternative URI') 1035 parser.add_argument('--test-sel-uri', default=None, 1036 help='test mode: handover select URI') 1037 parser.add_argument('--test-crn', default=None, 1038 help='test mode: hardcoded crn') 1039 parser.add_argument('command', choices=['write-nfc-uri', 1040 'write-nfc-hs'], 1041 nargs='?') 1042 args = parser.parse_args() 1043 summary(args) 1044 1045 global handover 1046 handover = ConnectionHandover() 1047 1048 global only_one 1049 only_one = args.only_one 1050 1051 global no_wait 1052 no_wait = args.no_wait 1053 1054 global chanlist, netrole, test_uri, test_alt_uri, test_sel_uri 1055 global test_crn 1056 chanlist = args.chan 1057 handover.altchanlist = args.altchan 1058 netrole = args.netrole 1059 test_uri = args.test_uri 1060 test_alt_uri = args.test_alt_uri 1061 test_sel_uri = args.test_sel_uri 1062 if args.test_crn: 1063 test_crn = struct.pack('>H', int(args.test_crn)) 1064 else: 1065 test_crn = None 1066 1067 logging.basicConfig(level=args.loglevel) 1068 for l in ['nfc.clf.rcs380', 1069 'nfc.clf.transport', 1070 'nfc.clf.device', 1071 'nfc.clf.__init__', 1072 'nfc.llcp', 1073 'nfc.handover']: 1074 log = logging.getLogger(l) 1075 log.setLevel(args.loglevel) 1076 1077 global init_on_touch 1078 init_on_touch = args.init_on_touch 1079 1080 global enrollee_only 1081 enrollee_only = args.enrollee 1082 1083 global configurator_only 1084 configurator_only = args.configurator 1085 1086 global config_params 1087 config_params = args.config_params 1088 1089 if args.ifname: 1090 global ifname 1091 ifname = args.ifname 1092 summary("Selected ifname " + ifname) 1093 1094 if args.ctrl: 1095 global wpas_ctrl 1096 wpas_ctrl = args.ctrl 1097 1098 if args.summary: 1099 global summary_file 1100 summary_file = args.summary 1101 1102 if args.success: 1103 global success_file 1104 success_file = args.success 1105 1106 if args.no_input: 1107 global no_input 1108 no_input = True 1109 1110 clf = nfc.ContactlessFrontend() 1111 1112 try: 1113 if not clf.open(args.device): 1114 summary("Could not open connection with an NFC device", color=C_RED) 1115 raise SystemExit(1) 1116 1117 if args.command == "write-nfc-uri": 1118 write_nfc_uri(clf, wait_remove=not args.no_wait) 1119 if not operation_success: 1120 raise SystemExit(1) 1121 raise SystemExit 1122 1123 if args.command == "write-nfc-hs": 1124 write_nfc_hs(clf, wait_remove=not args.no_wait) 1125 if not operation_success: 1126 raise SystemExit(1) 1127 raise SystemExit 1128 1129 global continue_loop 1130 while continue_loop: 1131 global in_raw_mode 1132 was_in_raw_mode = in_raw_mode 1133 clear_raw_mode() 1134 if was_in_raw_mode: 1135 print("\r") 1136 if args.handover_only: 1137 summary("Waiting a peer to be touched", color=C_MAGENTA) 1138 elif args.tag_read_only: 1139 summary("Waiting for a tag to be touched", color=C_BLUE) 1140 else: 1141 summary("Waiting for a tag or peer to be touched", 1142 color=C_GREEN) 1143 handover.wait_connection = True 1144 try: 1145 if args.tag_read_only: 1146 if not clf.connect(rdwr={'on-connect': rdwr_connected}): 1147 break 1148 elif args.handover_only: 1149 if not clf.connect(llcp={'on-startup': llcp_startup, 1150 'on-connect': llcp_connected, 1151 'on-release': llcp_release}, 1152 terminate=terminate_loop): 1153 break 1154 else: 1155 if not clf.connect(rdwr={'on-connect': rdwr_connected}, 1156 llcp={'on-startup': llcp_startup, 1157 'on-connect': llcp_connected, 1158 'on-release': llcp_release}, 1159 terminate=terminate_loop): 1160 break 1161 except Exception as e: 1162 summary("clf.connect failed: " + str(e)) 1163 break 1164 1165 if only_one and handover.connected: 1166 role = "selector" if handover.i_m_selector else "requestor" 1167 summary("Connection handover result: I'm the %s" % role, 1168 color=C_YELLOW) 1169 if handover.peer_uri: 1170 summary("Peer URI: " + handover.peer_uri, color=C_YELLOW) 1171 if handover.my_uri: 1172 summary("My URI: " + handover.my_uri, color=C_YELLOW) 1173 if not (handover.peer_uri and handover.my_uri): 1174 summary("Negotiated connection handover failed", 1175 color=C_YELLOW) 1176 break 1177 1178 except KeyboardInterrupt: 1179 raise SystemExit 1180 finally: 1181 clf.close() 1182 1183 raise SystemExit 1184 1185if __name__ == '__main__': 1186 main() 1187