#!/usr/bin/env python # # Copyright 2018 Espressif Systems (Shanghai) PTE LTD # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. # from __future__ import print_function from builtins import input import argparse import textwrap import time import os import sys import json from getpass import getpass try: import security import transport import prov except ImportError: idf_path = os.environ['IDF_PATH'] sys.path.insert(0, idf_path + "/components/protocomm/python") sys.path.insert(1, idf_path + "/tools/esp_prov") import security import transport import prov # Set this to true to allow exceptions to be thrown config_throw_except = False def on_except(err): if config_throw_except: raise RuntimeError(err) else: print(err) def get_security(secver, pop=None, verbose=False): if secver == 1: return security.Security1(pop, verbose) elif secver == 0: return security.Security0(verbose) return None def get_transport(sel_transport, service_name): try: tp = None if (sel_transport == 'softap'): if service_name is None: service_name = '192.168.4.1:80' tp = transport.Transport_HTTP(service_name) elif (sel_transport == 'ble'): if service_name is None: raise RuntimeError('"--service_name" must be specified for ble transport') # BLE client is now capable of automatically figuring out # the primary service from the advertisement data and the # characteristics corresponding to each endpoint. # Below, the service_uuid field and 16bit UUIDs in the nu_lookup # table are provided only to support devices running older firmware, # in which case, the automated discovery will fail and the client # will fallback to using the provided UUIDs instead nu_lookup = {'prov-session': 'ff51', 'prov-config': 'ff52', 'proto-ver': 'ff53'} tp = transport.Transport_BLE(devname=service_name, service_uuid='021a9004-0382-4aea-bff4-6b3f1c5adfb4', nu_lookup=nu_lookup) elif (sel_transport == 'console'): tp = transport.Transport_Console() return tp except RuntimeError as e: on_except(e) return None def version_match(tp, protover, verbose=False): try: response = tp.send_data('proto-ver', protover) if verbose: print("proto-ver response : ", response) # First assume this to be a simple version string if response.lower() == protover.lower(): return True try: # Else interpret this as JSON structure containing # information with versions and capabilities of both # provisioning service and application info = json.loads(response) if info['prov']['ver'].lower() == protover.lower(): return True except ValueError: # If decoding as JSON fails, it means that capabilities # are not supported return False except Exception as e: on_except(e) return None def has_capability(tp, capability='none', verbose=False): # Note : default value of `capability` argument cannot be empty string # because protocomm_httpd expects non zero content lengths try: response = tp.send_data('proto-ver', capability) if verbose: print("proto-ver response : ", response) try: # Interpret this as JSON structure containing # information with versions and capabilities of both # provisioning service and application info = json.loads(response) supported_capabilities = info['prov']['cap'] if capability.lower() == 'none': # No specific capability to check, but capabilities # feature is present so return True return True elif capability in supported_capabilities: return True return False except ValueError: # If decoding as JSON fails, it means that capabilities # are not supported return False except RuntimeError as e: on_except(e) return False def get_version(tp): response = None try: response = tp.send_data('proto-ver', '---') except RuntimeError as e: on_except(e) response = '' return response def establish_session(tp, sec): try: response = None while True: request = sec.security_session(response) if request is None: break response = tp.send_data('prov-session', request) if (response is None): return False return True except RuntimeError as e: on_except(e) return None def custom_config(tp, sec, custom_info, custom_ver): try: message = prov.custom_config_request(sec, custom_info, custom_ver) response = tp.send_data('custom-config', message) return (prov.custom_config_response(sec, response) == 0) except RuntimeError as e: on_except(e) return None def scan_wifi_APs(sel_transport, tp, sec): APs = [] group_channels = 0 readlen = 100 if sel_transport == 'softap': # In case of softAP we must perform the scan on individual channels, one by one, # so that the Wi-Fi controller gets ample time to send out beacons (necessary to # maintain connectivity with authenticated stations. As scanning one channel at a # time will be slow, we can group more than one channels to be scanned in quick # succession, hence speeding up the scan process. Though if too many channels are # present in a group, the controller may again miss out on sending beacons. Hence, # the application must should use an optimum value. The following value usually # works out in most cases group_channels = 5 elif sel_transport == 'ble': # Read at most 4 entries at a time. This is because if we are using BLE transport # then the response packet size should not exceed the present limit of 256 bytes of # characteristic value imposed by protocomm_ble. This limit may be removed in the # future readlen = 4 try: message = prov.scan_start_request(sec, blocking=True, group_channels=group_channels) start_time = time.time() response = tp.send_data('prov-scan', message) stop_time = time.time() print("++++ Scan process executed in " + str(stop_time - start_time) + " sec") prov.scan_start_response(sec, response) message = prov.scan_status_request(sec) response = tp.send_data('prov-scan', message) result = prov.scan_status_response(sec, response) print("++++ Scan results : " + str(result["count"])) if result["count"] != 0: index = 0 remaining = result["count"] while remaining: count = [remaining, readlen][remaining > readlen] message = prov.scan_result_request(sec, index, count) response = tp.send_data('prov-scan', message) APs += prov.scan_result_response(sec, response) remaining -= count index += count except RuntimeError as e: on_except(e) return None return APs def send_wifi_config(tp, sec, ssid, passphrase): try: message = prov.config_set_config_request(sec, ssid, passphrase) response = tp.send_data('prov-config', message) return (prov.config_set_config_response(sec, response) == 0) except RuntimeError as e: on_except(e) return None def apply_wifi_config(tp, sec): try: message = prov.config_apply_config_request(sec) response = tp.send_data('prov-config', message) return (prov.config_apply_config_response(sec, response) == 0) except RuntimeError as e: on_except(e) return None def get_wifi_config(tp, sec): try: message = prov.config_get_status_request(sec) response = tp.send_data('prov-config', message) return prov.config_get_status_response(sec, response) except RuntimeError as e: on_except(e) return None def desc_format(*args): desc = '' for arg in args: desc += textwrap.fill(replace_whitespace=False, text=arg) + "\n" return desc if __name__ == '__main__': parser = argparse.ArgumentParser(description=desc_format( 'ESP Provisioning tool for configuring devices ' 'running protocomm based provisioning service.', 'See esp-idf/examples/provisioning for sample applications'), formatter_class=argparse.RawTextHelpFormatter) parser.add_argument("--transport", required=True, dest='mode', type=str, help=desc_format( 'Mode of transport over which provisioning is to be performed.', 'This should be one of "softap", "ble" or "console"')) parser.add_argument("--service_name", dest='name', type=str, help=desc_format( 'This specifies the name of the provisioning service to connect to, ' 'depending upon the mode of transport :', '\t- transport "ble" : The BLE Device Name', '\t- transport "softap" : HTTP Server hostname or IP', '\t (default "192.168.4.1:80")')) parser.add_argument("--proto_ver", dest='version', type=str, default='', help=desc_format( 'This checks the protocol version of the provisioning service running ' 'on the device before initiating Wi-Fi configuration')) parser.add_argument("--sec_ver", dest='secver', type=int, default=None, help=desc_format( 'Protocomm security scheme used by the provisioning service for secure ' 'session establishment. Accepted values are :', '\t- 0 : No security', '\t- 1 : X25519 key exchange + AES-CTR encryption', '\t + Authentication using Proof of Possession (PoP)', 'In case device side application uses IDF\'s provisioning manager, ' 'the compatible security version is automatically determined from ' 'capabilities retrieved via the version endpoint')) parser.add_argument("--pop", dest='pop', type=str, default='', help=desc_format( 'This specifies the Proof of possession (PoP) when security scheme 1 ' 'is used')) parser.add_argument("--ssid", dest='ssid', type=str, default='', help=desc_format( 'This configures the device to use SSID of the Wi-Fi network to which ' 'we would like it to connect to permanently, once provisioning is complete. ' 'If Wi-Fi scanning is supported by the provisioning service, this need not ' 'be specified')) parser.add_argument("--passphrase", dest='passphrase', type=str, default='', help=desc_format( 'This configures the device to use Passphrase for the Wi-Fi network to which ' 'we would like it to connect to permanently, once provisioning is complete. ' 'If Wi-Fi scanning is supported by the provisioning service, this need not ' 'be specified')) parser.add_argument("--custom_config", action="store_true", help=desc_format( 'This is an optional parameter, only intended for use with ' '"examples/provisioning/custom_config"')) parser.add_argument("--custom_info", dest='custom_info', type=str, default='', help=desc_format( 'Custom Config Info String. "--custom_config" must be specified for using this')) parser.add_argument("--custom_ver", dest='custom_ver', type=int, default=2, help=desc_format( 'Custom Config Version Number. "--custom_config" must be specified for using this')) parser.add_argument("-v","--verbose", help="Increase output verbosity", action="store_true") args = parser.parse_args() obj_transport = get_transport(args.mode.lower(), args.name) if obj_transport is None: print("---- Failed to establish connection ----") exit(1) # If security version not specified check in capabilities if args.secver is None: # First check if capabilities are supported or not if not has_capability(obj_transport): print('Security capabilities could not be determined. Please specify "--sec_ver" explicitly') print("---- Invalid Security Version ----") exit(2) # When no_sec is present, use security 0, else security 1 args.secver = int(not has_capability(obj_transport, 'no_sec')) print("Security scheme determined to be :", args.secver) if (args.secver != 0) and not has_capability(obj_transport, 'no_pop'): if len(args.pop) == 0: print("---- Proof of Possession argument not provided ----") exit(2) elif len(args.pop) != 0: print("---- Proof of Possession will be ignored ----") args.pop = '' obj_security = get_security(args.secver, args.pop, args.verbose) if obj_security is None: print("---- Invalid Security Version ----") exit(2) if args.version != '': print("\n==== Verifying protocol version ====") if not version_match(obj_transport, args.version, args.verbose): print("---- Error in protocol version matching ----") exit(3) print("==== Verified protocol version successfully ====") print("\n==== Starting Session ====") if not establish_session(obj_transport, obj_security): print("Failed to establish session. Ensure that security scheme and proof of possession are correct") print("---- Error in establishing session ----") exit(4) print("==== Session Established ====") if args.custom_config: print("\n==== Sending Custom config to esp32 ====") if not custom_config(obj_transport, obj_security, args.custom_info, args.custom_ver): print("---- Error in custom config ----") exit(5) print("==== Custom config sent successfully ====") if args.ssid == '': if not has_capability(obj_transport, 'wifi_scan'): print("---- Wi-Fi Scan List is not supported by provisioning service ----") print("---- Rerun esp_prov with SSID and Passphrase as argument ----") exit(3) while True: print("\n==== Scanning Wi-Fi APs ====") start_time = time.time() APs = scan_wifi_APs(args.mode.lower(), obj_transport, obj_security) end_time = time.time() print("\n++++ Scan finished in " + str(end_time - start_time) + " sec") if APs is None: print("---- Error in scanning Wi-Fi APs ----") exit(8) if len(APs) == 0: print("No APs found!") exit(9) print("==== Wi-Fi Scan results ====") print("{0: >4} {1: <33} {2: <12} {3: >4} {4: <4} {5: <16}".format( "S.N.", "SSID", "BSSID", "CHN", "RSSI", "AUTH")) for i in range(len(APs)): print("[{0: >2}] {1: <33} {2: <12} {3: >4} {4: <4} {5: <16}".format( i + 1, APs[i]["ssid"], APs[i]["bssid"], APs[i]["channel"], APs[i]["rssi"], APs[i]["auth"])) while True: try: select = int(input("Select AP by number (0 to rescan) : ")) if select < 0 or select > len(APs): raise ValueError break except ValueError: print("Invalid input! Retry") if select != 0: break args.ssid = APs[select - 1]["ssid"] prompt_str = "Enter passphrase for {0} : ".format(args.ssid) args.passphrase = getpass(prompt_str) print("\n==== Sending Wi-Fi credential to esp32 ====") if not send_wifi_config(obj_transport, obj_security, args.ssid, args.passphrase): print("---- Error in send Wi-Fi config ----") exit(6) print("==== Wi-Fi Credentials sent successfully ====") print("\n==== Applying config to esp32 ====") if not apply_wifi_config(obj_transport, obj_security): print("---- Error in apply Wi-Fi config ----") exit(7) print("==== Apply config sent successfully ====") while True: time.sleep(5) print("\n==== Wi-Fi connection state ====") ret = get_wifi_config(obj_transport, obj_security) if (ret == 1): continue elif (ret == 0): print("==== Provisioning was successful ====") else: print("---- Provisioning failed ----") break