Random adb ports in Android 11+

[ReenigneArcher]

In Android 11 it appears to choose a random ADB port (from what I've seen between 30000 and 50000)... what's the best way to find the port number from python?

This might not be all devices, but it's what I've observed on Pixel 3 and 2.

[codeskyblue]

from ENV? for example env:ANDROID_ADB_SERVER_PORT

[ReenigneArcher]

Hi, I'm not looking for the port of the adb server, but the adb port of the client device. Android 10 and below I believe always used 5555, but now it is random.

My adb server is Windows 10 but don't think that matters.

I believe the random port can be between 30000 and 60000, but not 100% sure.

Maybe a multi threaded port scan function could be added?

[ReenigneArcher]

I solved this by making a multi threaded port scanner and attempting to connect. This may not work right out of the box (I tried to copy the relevant parts out of my script)

import socket
from adbutils import adb

def myfunction(clientIP):
    global scannerIP
    scannerIP = clientIP

    adbRanges = [ [5555, 5585], [30000 , 50000] ] #https://www.reddit.com/r/tasker/comments/jbzeg5/adb_wifi_and_android_11_wireless_debugging/
    for adbRange in adbRanges:
        adbThreadedScan(adbRange)
        adbAddress = adbConnect(clientIP, adbPortsFound)
        if adbAddress != None:
            device = adb.device(serial=adbAddress)
            break

def adbConnect(clientIP, adbPortsFound):
    for adbPort in adbPortsFound:
        adbAddress = clientIP + ':' + str(adbPort)
        adbConnectOutput = adb.connect(adbAddress)
        message = adbConnectOutput.split(clientIP + ':' + str(adbPort), 1)[0].strip()
        if message == 'connected to' or message == 'already connected to':
            logging.info('adb connected on port: %s' % (adbPort))
            return adbAddress

def adbThreadedScan(adbRange):
    from threading import Thread
    from queue import Queue

    # number of threads, imported from dictionary of preferences
    rangeThreads = adbRange[-1] - adbRange[0]
    prefThreads = Prefs['int_PortScanThreads']
    if rangeThreads < prefThreads:
        N_THREADS = rangeThreads
    else:
        N_THREADS = prefThreads
    # thread queue
    global q
    q = Queue()

    global adbPortsFound
    adbPortsFound = []
    for t in range(N_THREADS):
        try:
            #for each thread, start it
            t = Thread(target=port_scan_thread)
            #when we set daemon to true, that thread will end when the main thread ends
            t.daemon = True
            #start the daemon thread
            t.start()
        except RuntimeError as e:
            break

    for port in range(adbRange[0], adbRange[-1]):
        if (port % 2) != 0: #if port is an odd number
            #for each port, put that port into the queue
            #to start scanning
            q.put(port)
    q.join() #wait for all ports to finish being scanned

def port_scan(host, port): #determine whether `host` has the `port` open
    try:
        # creates a new socket
        s = socket.socket()
        # tries to connect to host using that port
        s.connect((host, port))
        # make timeout if you want it a little faster ( less accuracy )
        # s.settimeout(0.2)
    except:
        # cannot connect, port is closed
        pass
    else:
        # the connection was established, port is open!
        adbPortsFound.append(port)
    finally:
        s.close()

def port_scan_thread():
    while True:
        # get the port number from the queue
        port = q.get()
        # scan that port number
        port_scan(scannerIP, port)
        # tells the queue that the scanning for that port 
        # is done
        q.task_done()

I will keep this open, but if the dev would like to close it that's fine. It would be nice to see the functionality added to this library.

[codeskyblue]

@ReenigneArcher https://github.com/openatx/adbutils/invitations

[ReenigneArcher]

I'm still struggling to find a good solution to this, as port scanning is slow. Honestly I do not understand why Android decided to go with the random ports and complicated pairing process.