109 lines
3.5 KiB
Java
109 lines
3.5 KiB
Java
/*
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Copyright 2020 mark.nellemann@gmail.com
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package biz.nellemann.syslogd.parser;
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import biz.nellemann.syslogd.msg.Facility;
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import biz.nellemann.syslogd.msg.Severity;
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import biz.nellemann.syslogd.msg.SyslogMessage;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.time.*;
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import java.time.format.DateTimeFormatter;
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import java.time.format.DateTimeParseException;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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public class SyslogParserRfc3164 extends SyslogParser {
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private final static Logger log = LoggerFactory.getLogger(SyslogParserRfc3164.class);
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private final Pattern pattern = Pattern.compile("^<(\\d{1,3})>(\\D{3}\\s+\\d{1,2} \\d{2}:\\d{2}:\\d{2})\\s+(Message forwarded from \\S+:|\\S+:?)\\s+([^\\s:]+):?\\s+(.*)", Pattern.CASE_INSENSITIVE);
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private final DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy MMM [ ]d HH:mm:ss").withZone(ZoneId.systemDefault());
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/**
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* Parses [rfc3164](https://tools.ietf.org/html/rfc3164) syslog messages.
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*
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* @param input
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* @return
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* @throws NumberFormatException
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*/
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@Override
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public SyslogMessage parse(final String input) throws NumberFormatException {
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log.debug("parseRfc3164() " + input);
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Matcher matcher = pattern.matcher(input);
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if(!matcher.find()) {
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System.err.println("!" + input);
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return null;
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}
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String pri = matcher.group(1);
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String date = matcher.group(2);
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String hostname = matcher.group(3);
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String application = matcher.group(4);
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String msg = matcher.group(5);
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if(hostname.endsWith(":")) {
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String[] tmp = hostname.split(" ");
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hostname = tmp[tmp.length-1];
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hostname = hostname.substring(0, hostname.length()-1);
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}
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Integer facility = getFacility(pri);
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Integer severity = getSeverity(pri);
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SyslogMessage syslogMessage = new SyslogMessage(msg.trim());
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syslogMessage.facility = Facility.getByNumber(facility);
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syslogMessage.severity = Severity.getByNumber(severity);
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syslogMessage.timestamp = parseTimestamp(date);
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syslogMessage.hostname = hostname;
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syslogMessage.application = application;
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return syslogMessage;
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}
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@Override
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public SyslogMessage parse(byte[] input) {
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return parse(byteArrayToString(input));
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}
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/**
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* Parse rfc3164 TIMESTAMP field into Instant.
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*
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* @param dateString
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* @return
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*/
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public Instant parseTimestamp(String dateString) {
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// We need to add current year to parse date correctly
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OffsetDateTime odt = OffsetDateTime.now();
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// Date: Mmm dd hh:mm:ss
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try {
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return Instant.from(dateTimeFormatter.parse(odt.getYear() + " " + dateString));
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} catch(DateTimeParseException e) {
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log.debug("parseTimestamp()", e);
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}
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log.warn("parseTimestamp() - Could not parse timestamp: " + dateString);
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return Instant.now();
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}
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}
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