import os import re import socket import struct import subprocess import time from threading import Event, Thread import dpkt import dpkt.dns import ttfw_idf from tiny_test_fw import DUT stop_mdns_server = Event() esp_answered = Event() def get_dns_query_for_esp(esp_host): dns = dpkt.dns.DNS(b'\x00\x00\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x01\x00\x01') dns.qd[0].name = esp_host + u'.local' print('Created query for esp host: {} '.format(dns.__repr__())) return dns.pack() def get_dns_answer_to_mdns(tester_host): dns = dpkt.dns.DNS(b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00') dns.op = dpkt.dns.DNS_QR | dpkt.dns.DNS_AA dns.rcode = dpkt.dns.DNS_RCODE_NOERR arr = dpkt.dns.DNS.RR() arr.cls = dpkt.dns.DNS_IN arr.type = dpkt.dns.DNS_A arr.name = tester_host arr.ip = socket.inet_aton('127.0.0.1') dns. an.append(arr) print('Created answer to mdns query: {} '.format(dns.__repr__())) return dns.pack() def get_dns_answer_to_mdns_lwip(tester_host, id): dns = dpkt.dns.DNS(b'\x5e\x39\x84\x00\x00\x01\x00\x01\x00\x00\x00\x00\x0a\x64\x61\x76\x69\x64' b'\x2d\x63\x6f\x6d\x70\x05\x6c\x6f\x63\x61\x6c\x00\x00\x01\x00\x01\xc0\x0c' b'\x00\x01\x00\x01\x00\x00\x00\x0a\x00\x04\xc0\xa8\x0a\x6c') dns.qd[0].name = tester_host dns.an[0].name = tester_host dns.an[0].ip = socket.inet_aton('127.0.0.1') dns.an[0].rdata = socket.inet_aton('127.0.0.1') dns.id = id print('Created answer to mdns (lwip) query: {} '.format(dns.__repr__())) return dns.pack() def mdns_server(esp_host): global esp_answered UDP_IP = '0.0.0.0' UDP_PORT = 5353 MCAST_GRP = '224.0.0.251' TESTER_NAME = u'tinytester.local' TESTER_NAME_LWIP = u'tinytester-lwip.local' sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1) sock.bind((UDP_IP,UDP_PORT)) mreq = struct.pack('4sl', socket.inet_aton(MCAST_GRP), socket.INADDR_ANY) sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq) sock.settimeout(30) while not stop_mdns_server.is_set(): try: if not esp_answered.is_set(): sock.sendto(get_dns_query_for_esp(esp_host), (MCAST_GRP,UDP_PORT)) time.sleep(0.2) data, addr = sock.recvfrom(1024) dns = dpkt.dns.DNS(data) if len(dns.qd) > 0 and dns.qd[0].type == dpkt.dns.DNS_A: if dns.qd[0].name == TESTER_NAME: print('Received query: {} '.format(dns.__repr__())) sock.sendto(get_dns_answer_to_mdns(TESTER_NAME), (MCAST_GRP,UDP_PORT)) elif dns.qd[0].name == TESTER_NAME_LWIP: print('Received query: {} '.format(dns.__repr__())) sock.sendto(get_dns_answer_to_mdns_lwip(TESTER_NAME_LWIP, dns.id), addr) if len(dns.an) > 0 and dns.an[0].type == dpkt.dns.DNS_A: if dns.an[0].name == esp_host + u'.local': print('Received answer to esp32-mdns query: {}'.format(dns.__repr__())) esp_answered.set() except socket.timeout: break except dpkt.UnpackError: continue @ttfw_idf.idf_example_test(env_tag='Example_WIFI_Protocols') def test_examples_protocol_mdns(env, extra_data): global stop_mdns_server """ steps: | 1. join AP + init mdns example 2. get the dut host name (and IP address) 3. check the mdns name is accessible 4. check DUT output if mdns advertized host is resolved """ dut1 = env.get_dut('mdns-test', 'examples/protocols/mdns', dut_class=ttfw_idf.ESP32DUT) # check and log bin size binary_file = os.path.join(dut1.app.binary_path, 'mdns-test.bin') bin_size = os.path.getsize(binary_file) ttfw_idf.log_performance('mdns-test_bin_size', '{}KB'.format(bin_size // 1024)) # 1. start mdns application dut1.start_app() # 2. get the dut host name (and IP address) specific_host = dut1.expect(re.compile(r'mdns hostname set to: \[([^\]]+)\]'), timeout=30) specific_host = str(specific_host[0]) thread1 = Thread(target=mdns_server, args=(specific_host,)) thread1.start() try: ip_address = dut1.expect(re.compile(r' sta ip: ([^,]+),'), timeout=30)[0] print('Connected to AP with IP: {}'.format(ip_address)) except DUT.ExpectTimeout: stop_mdns_server.set() thread1.join() raise ValueError('ENV_TEST_FAILURE: Cannot connect to AP') try: # 3. check the mdns name is accessible if not esp_answered.wait(timeout=30): raise ValueError('Test has failed: did not receive mdns answer within timeout') # 4. check DUT output if mdns advertized host is resolved dut1.expect(re.compile(r'mdns-test: Query A: tinytester.local resolved to: 127.0.0.1'), timeout=30) dut1.expect(re.compile(r'mdns-test: gethostbyname: tinytester-lwip.local resolved to: 127.0.0.1'), timeout=30) dut1.expect(re.compile(r'mdns-test: getaddrinfo: tinytester-lwip.local resolved to: 127.0.0.1'), timeout=30) # 5. check the DUT answers to `dig` command dig_output = subprocess.check_output(['dig', '+short', '-p', '5353', '@224.0.0.251', '{}.local'.format(specific_host)]) print('Resolving {} using "dig" succeeded with:\n{}'.format(specific_host, dig_output)) if not ip_address.encode('utf-8') in dig_output: raise ValueError('Test has failed: Incorrectly resolved DUT hostname using dig' "Output should've contained DUT's IP address:{}".format(ip_address)) finally: stop_mdns_server.set() thread1.join() if __name__ == '__main__': test_examples_protocol_mdns()