Iperf3 error unable to create a new stream permission denied

I creating an Android application that allow to execute some iperf commands. To do that, I got the version 3 of the source code of the IPerf C project and I cross-compile it using those commands :

> make clean
> ./configure --host=arm-linux --prefix=/home/laboPC/Downloads CC=arm-linux-androideabi-gcc CXX=arm-linux-androideabi-g++ CFLAGS="-static" CXXFLAGS="-static" LDFLAGS="-pie -fuse-ld=bfd"
> make

After the cross-compile, I got a binary file that I put in the assets folder in my android project.

For using IPerf from Android, I create a copy of the binary in this way :

private String binariePath = context.getApplicationInfo().dataDir + "/iperf3";

private void setupBinaries(){
     InputStream in = context.getResources().openRawResource(R.raw.iperf3);
     OutputStream out = new FileOutputStream(binariePath);
     byte[] buf = new byte[1024];
     int len;

     while ((len = in.read(buf)) > 0) {
         out.write(buf, 0, len);
     }
     in.close();
     out.flush();
     out.close();
     Runtime.getRuntime().exec("chmod 751 " + binariePath);
}

And then, I using a Runtime object to execute a iperf command like this :

public String runClient (String server, String argument) {
    try {
       setupBinaries();

        process = Runtime.getRuntime().exec(binariePath + " -c " + server + " " + argument);
        BufferedReader reader = new BufferedReader( new InputStreamReader(process.getInputStream()));

        final StringBuilder result = new StringBuilder();
        String line;
        while ((line = reader.readLine()) != null) {
            result.append(line + "n");
        }
        reader.close();
        process.destroy();
        return result.toString();

    } catch (IOException e) {
        Log.d("IPERF", e.getLocalizedMessage());
        return e.getLocalizedMessage();
    }
}

Everythings works fine except in Android 7.0. When I runnig my app on the Nexus 5X in Android 7, the iperf command seems not to be execute and my result variable is empty.

I checked that the Runtime.exec() works fine in android 7 and that the binary is correctly copy in the app data directory.

Is everyone has an idea what is wrong in my process ? Is my commands fo compile IPerf project is correct ?

Thanks for your help.

EDIT

I found in the followings threads that Android 6.0 and higher can execute binaries that are compiled with the -fPIC option :

android ndk: are -fPIC and -pie mututally exclusive?

Position Independent Executables and Android Lollipop

So I tried to compile my C project by using this command line :

./configure —host=arm-linux —prefix=/home/laboPC/Downloads CC=arm-linux-androideabi-gcc CXX=arm-linux-androideabi-g++ CFLAGS=»-static -fPIC» CXXFLAGS=»-static» LDFLAGS=»-pie -fuse-ld=bfd»

I think there is something wrong about my command line but I don’t know what. Is anybody can help me to identifiate what I wrong in my command line ?

C:>iperf3
Usage: iperf [-s|-c host] [options]
       iperf [-h|--help] [-v|--version]

Server or Client:
  -p, --port      #         server port to listen on/connect to
  -f, --format    [kmgKMG]  format to report: Kbits, Mbits, KBytes, MBytes
  -i, --interval  #         seconds between periodic bandwidth reports
  -F, --file name           xmit/recv the specified file
  -B, --bind      <host>    bind to a specific interface
  -V, --verbose             more detailed output
  -J, --json                output in JSON format
  --logfile f               send output to a log file
  -d, --debug               emit debugging output
  -v, --version             show version information and quit
  -h, --help                show this message and quit
Server specific:
  -s, --server              run in server mode
  -D, --daemon              run the server as a daemon
  -I, --pidfile file        write PID file
  -1, --one-off             handle one client connection then exit
Client specific:
  -c, --client    <host>    run in client mode, connecting to <host>
  -u, --udp                 use UDP rather than TCP
  -b, --bandwidth #[KMG][/#] target bandwidth in bits/sec (0 for unlimited)
                            (default 1 Mbit/sec for UDP, unlimited for TCP)
                            (optional slash and packet count for burst mode)
  -t, --time      #         time in seconds to transmit for (default 10 secs)
  -n, --bytes     #[KMG]    number of bytes to transmit (instead of -t)
  -k, --blockcount #[KMG]   number of blocks (packets) to transmit (instead of -
t or -n)
  -l, --len       #[KMG]    length of buffer to read or write
                            (default 128 KB for TCP, 8 KB for UDP)
  --cport         <port>    bind to a specific client port (TCP and UDP, default
: ephemeral port)
  -P, --parallel  #         number of parallel client streams to run
  -R, --reverse             run in reverse mode (server sends, client receives)
  -w, --window    #[KMG]    set window size / socket buffer size
  -M, --set-mss   #         set TCP/SCTP maximum segment size (MTU - 40 bytes)
  -N, --no-delay            set TCP/SCTP no delay, disabling Nagle's Algorithm
  -4, --version4            only use IPv4
  -6, --version6            only use IPv6
  -S, --tos N               set the IP 'type of service'
  -Z, --zerocopy            use a 'zero copy' method of sending data
  -O, --omit N              omit the first n seconds
  -T, --title str           prefix every output line with this string
  --get-server-output       get results from server
  --udp-counters-64bit      use 64-bit counters in UDP test packets

[KMG] indicates options that support a K/M/G suffix for kilo-, mega-, or giga-

iperf3 homepage at: http://software.es.net/iperf/
Report bugs to:     https://github.com/esnet/iperf

C:Program Filesiperf>

C:Program Filesiperf>iperf3 -c bouygues.testdebit.info
Connecting to host bouygues.testdebit.info, port 5201
iperf3: error - unable to create a new stream: Permission denied

C:Program Filesiperf>

C:Program Filesiperf>iperf3 -c bouygues.testdebit.info
Connecting to host bouygues.testdebit.info, port 5201
[  4] local 192.168.0.6 port 49894 connected to 89.84.127.53 port 5201
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   512 KBytes  4.19 Mbits/sec
[  4]   1.00-2.00   sec  1.00 MBytes  8.39 Mbits/sec
[  4]   2.00-3.00   sec   896 KBytes  7.35 Mbits/sec
[  4]   3.00-4.00   sec  1.00 MBytes  8.39 Mbits/sec
[  4]   4.00-5.00   sec   896 KBytes  7.34 Mbits/sec
[  4]   5.00-6.00   sec   896 KBytes  7.33 Mbits/sec
[  4]   6.00-7.00   sec  1.00 MBytes  8.39 Mbits/sec
[  4]   7.00-8.00   sec   896 KBytes  7.34 Mbits/sec
[  4]   8.00-9.00   sec   896 KBytes  7.34 Mbits/sec
[  4]   9.00-10.00  sec  1.00 MBytes  8.40 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  8.88 MBytes  7.44 Mbits/sec                  sender
[  4]   0.00-10.00  sec  8.87 MBytes  7.44 Mbits/sec                  receiver

iperf Done.

C:Program Filesiperf>

ArrayList<String> commandLine = new ArrayList<String>();
commandLine.add("su");
commandLine.add("-c");
commandLine.add(getApplicationContext().getApplicationInfo().nativeLibraryDir+"/libiperf3.so -c speedtest.hostkey.ru -t 10 -i 5 -P 3 -d");
Process process = Runtime.getRuntime().exec(commandLine.toArray(new String[0]));

iperf3: error - unable to create a new stream: Permission denied

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Лучший ответ

char buf[] = "/tmp/iperf3.XXXXXX";