oshi.driver.unix.NetStatTcp Maven / Gradle / Ivy
/**
* MIT License
*
* Copyright (c) 2010 - 2020 The OSHI Project Contributors: https://github.com/oshi/oshi/graphs/contributors
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package oshi.driver.unix;
import java.util.List;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.util.ExecutingCommand;
import oshi.util.tuples.Pair;
/**
* Utility to query TCP connections
*/
@ThreadSafe
public final class NetStatTcp {
private NetStatTcp() {
}
/**
* Query netstat to obtain number of established TCP connections
*
* @return A pair with number of established IPv4 and IPv6 connections
*/
public static Pair queryTcpnetstat() {
long tcp4 = 0L;
long tcp6 = 0L;
List activeConns = ExecutingCommand.runNative("netstat -n -p tcp");
for (String s : activeConns) {
if (s.endsWith("ESTABLISHED")) {
if (s.startsWith("tcp4")) {
tcp4++;
} else if (s.startsWith("tcp6")) {
tcp6++;
}
}
}
return new Pair<>(tcp4, tcp6);
}
}