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/**
* 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.time.LocalDateTime;
import java.time.Year;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeFormatterBuilder;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import oshi.annotation.concurrent.ThreadSafe;
import oshi.software.os.OSSession;
import oshi.util.Constants;
import oshi.util.ExecutingCommand;
/**
* Utility to query logged in users.
*/
@ThreadSafe
public final class Who {
// sample format:
// oshi pts/0 2020-05-14 21:23 (192.168.1.23)
private static final Pattern WHO_FORMAT_LINUX = Pattern
.compile("(\\S+)\\s+(\\S+)\\s+(\\d{4}-\\d{2}-\\d{2})\\s+(\\d{2}:\\d{2})\\s*(?:\\((.+)\\))?");
private static final DateTimeFormatter WHO_DATE_FORMAT_LINUX = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
// oshi ttys000 May 4 23:50 (192.168.1.23)
// middle 12 characters from Thu Nov 24 18:22:48 1986
private static final Pattern WHO_FORMAT_UNIX = Pattern
.compile("(\\S+)\\s+(\\S+)\\s+(\\S+)\\s+(\\d+)\\s+(\\d{2}:\\d{2})\\s*(?:\\((.+)\\))?");
private static final DateTimeFormatter WHO_DATE_FORMAT_UNIX = new DateTimeFormatterBuilder()
.appendPattern("MMM d HH:mm").parseDefaulting(ChronoField.YEAR, Year.now().getValue())
.toFormatter(Locale.US);
private Who() {
}
/**
* Query {@code who} to get logged in users
*
* @return A list of logged in user sessions
*/
public static synchronized List queryWho() {
List whoList = new ArrayList<>();
List who = ExecutingCommand.runNative("who");
for (String s : who) {
Matcher m = WHO_FORMAT_LINUX.matcher(s);
if (m.matches()) {
try {
whoList.add(new OSSession(m.group(1), m.group(2),
LocalDateTime.parse(m.group(3) + " " + m.group(4), WHO_DATE_FORMAT_LINUX)
.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli(),
m.group(5) == null ? Constants.UNKNOWN : m.group(5)));
} catch (DateTimeParseException | NullPointerException e) {
// shouldn't happen if regex matches and OS is producing sensible dates
}
} else {
m = WHO_FORMAT_UNIX.matcher(s);
if (m.matches()) {
try {
// Missing year, parse date time with current year
LocalDateTime login = LocalDateTime.parse(m.group(3) + " " + m.group(4) + " " + m.group(5),
WHO_DATE_FORMAT_UNIX);
// If this date is in the future, subtract a year
if (login.isAfter(LocalDateTime.now())) {
login = login.minus(1, ChronoUnit.YEARS);
}
long millis = login.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
whoList.add(
new OSSession(m.group(1), m.group(2), millis, m.group(6) == null ? "" : m.group(6)));
} catch (DateTimeParseException | NullPointerException e) {
// shouldn't happen if regex matches and OS is producing sensible dates
}
}
}
}
return whoList;
}
}
