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Thread: Python: execute ping as subprocess with timeout

  1. #1
    Join Date
    Dec 2009
    Beans
    505

    Python: execute ping as subprocess with timeout

    Hi,
    I have to measure RTT between several hosts in Internet. In python there are several libraries, however they require root access. For this reason I wrote a simple function that call system ping and parse the output.
    Code:
    for host in tqdm(hosts):
        ping=subprocess.Popen(["ping", "-c", "1", "-w", "0.2", host],stdout=subprocess.PIPE, stderr = subprocess.PIPE)
        [out, err]=ping.communicate()
        if ping.returncode == 0:
            avgRTT=re.search("rtt min/avg/max/mdev = (\d+.\d+)/(\d+.\d+)/(\d+.\d+)/(\d+.\d+)", str(out)).group(1)
    I want to ping an host and timeout if it last over 200 ms (200 ms is the minimum value without having root access).
    From man ping, I read that the options -w deadline and -W timeout should do the job, but they does not work as aspected if an host is unreachable.
    I already read here and the only solution is to use fping that is not portable.
    Thank you

  2. #2
    Join Date
    Dec 2009
    Beans
    505

    Re: Python: execute ping as subprocess with timeout

    Hi,
    I solved by myself with the following code:
    Code:
    for host in tqdm(hosts):
        ping=subprocess.Popen(["ping", "-c", "1", proxy[0]],stdout=subprocess.PIPE,stderr=subprocess.PIPE)
            try:             
                [out, err]=ping.communicate(timeout=0.1)
                if ping.returncode == 0:
                    avgRTT=re.search("rtt min/avg/max/mdev = (\d+.\d+)/(\d+.\d+)/(\d+.\d+)/(\d+.\d+)", str(out)).group(1)
                except subprocess.TimeoutExpired:
                    ping.kill()
    The only problem is that I have to use python3.3+ since even by installing subprocess32 does not work for me.

  3. #3
    Join Date
    Jul 2018
    Beans
    1

    Re: Python: execute ping as subprocess with timeout

    Hai,
    I tried this one, it worked out for me.
    import subprocess

    from threading import Timer

    kill = lambda process: process.kill()
    cmd = ['ping', 'www.google.com']
    ping = subprocess.Popen(
    cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    my_timer = Timer(5, kill, [ping])

    try:
    my_timer.start()
    stdout, stderr = ping.communicate()
    finally:
    my_timer.cancel()
    I used the python 3.3 it works fine.
    Thank you,
    Riya

  4. #4
    Join Date
    Dec 2009
    Beans
    505

    Re: Python: execute ping as subprocess with timeout

    Thank you of your answer of course your solution works for python3.3+ as the mine.
    I think I will use only python3.3+. Moreover, I modified the script in order to work for different operating system.
    Code:
    for host in tqdm(hosts):
        if platform == "linux" or platform == "darwin":
            command=["ping", "-c", "3", "-i", "0.2", host]
                timeout=0.5
            else:
                command=["ping", "-n", "1", host]
                timeout=0.2
            ping=subprocess.Popen(command,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
            try:             
                [out, err]=proc.communicate(timeout=2.1)
                if proc.returncode == 0:
                    if platform == "linux" or platform == "darwin":
                        avgRTT=re.search("rtt min/avg/max/mdev = (\d+.\d+)/(\d+.\d+)/(\d+.\d+)/(\d+.\d+)", str(out)).group(2)
                    else:
                        # to do
                        avgRTT=re.search("", str(out))
    Unfortunately, windows has different ping version than GNU/linux or mac os X that does not support the option -i and so I have to play with timeout in order to limit the time required.
    Moreover, also the parsing is different.
    Last edited by erotavlas; 5 Days Ago at 08:45 AM.

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