Android(安卓)7.1使用以太网口共享本机4G网络给其他设备

     public String doEthernetShare() {          String result = "Failure";          DataOutputStream dataOutputStream = null;          BufferedReader errorStream = null;  String networkType = getNetworkType();        try {              MyLog("doEthernetShare.networkType=" + networkType);              Process process = Runtime.getRuntime().exec("su");             dataOutputStream = new DataOutputStream(process.getOutputStream());              String commandStr = "mount -o rw,remount / " + " \n" +"mount -o rw,remount /system " + " \n" +"mkdir -p /var/lib/misc/" + " \n" +"touch /var/lib/misc/udhcpd.leases" + " \n" +"echo 0 > /proc/sys/net/ipv4/ip_forward" + " \n"  +"busybox ifconfig eth0 up" + " \n"  +"busybox ifconfig eth0 192.168.1.1 netmask 255.255.255.0" + " \n"  +"/system/bin/iptables -t nat -A natctrl_nat_POSTROUTING -o " + networkType + " -j MASQUERADE" + " \n"  +"/system/bin/iptables -A natctrl_FORWARD -i " + networkType + " -o eth0 -m state --state ESTABLISHED,RELATED -g natctrl_tether_counters" + " \n" +"/system/bin/iptables -A natctrl_FORWARD -i eth0 -o " + networkType + " -m state --state INVALID -j DROP" + " \n"  +"/system/bin/iptables -A natctrl_FORWARD -i eth0 -o " + networkType + " -g natctrl_tether_counters" + " \n"  +"/system/bin/iptables -A natctrl_tether_counters -i eth0 -o " + networkType + " -j RETURN" + " \n"  +"/system/bin/iptables -A natctrl_tether_counters -i " + networkType + " -o eth0 -j RETURN" + " \n"  +"/system/bin/iptables -D natctrl_FORWARD -j DROP" + " \n"  +"/system/bin/iptables -A natctrl_FORWARD -j DROP" + " \n"  +"ip route add 192.168.1.0/24 dev eth0 table local_network proto static scope link" + " \n"  +"echo 1 > /proc/sys/net/ipv4/ip_forward" + " \n"  +"busybox1.11 udhcpd -fS /etc/udhcpd.conf" + " \n" ;             dataOutputStream.write(commandStr.getBytes(Charset.forName("utf-8")));              dataOutputStream.flush();              dataOutputStream.writeBytes("exit\n");              dataOutputStream.flush();              process.waitFor();              errorStream = new BufferedReader(new InputStreamReader(process.getErrorStream()));              String msg = "";              String line;              // 读取命令的执行结果              while ((line = errorStream.readLine()) != null) {                  msg += line;              }              MyLog("msg" +msg);              result = msg;        } catch (Exception e) {              Log.e(TAG_AZ, e.getMessage(), e);          } finally {              try {                  if (dataOutputStream != null) {                      dataOutputStream.close();                  }                  if (errorStream != null) {                      errorStream.close();                  }              } catch (IOException e) {                  Log.e(TAG_AZ, e.getMessage(), e);              }          }          return result;      }
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