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April 13, 2016 11:17
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Grok pattern for logstash from a syslog server
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| DHCPACTION (ACK|DECLINE|DISCOVER|INFORM|NAK|OFFER|RELEASE|REQUEST) | |
| DHCPGATEWAY %{IPV4:dhcp_gateway_ip} | |
| DHCPMESSAGE ((:)%{SPACE}%{GREEDYDATA:dhcp_message})? | |
| DHCPIPORMAC ((%{IPV4:dhcp_client_ip})|(%{COMMONMAC:dhcp_client_mac})) | |
| DHCPD (?:%{SYSLOGTIMESTAMP:timestamp}|%{TIMESTAMP_ISO8601:timestamp8601})%{SPACE}%{DHCPACTION:dhcp_action}%{SPACE}(for|on|from|to)%{SPACE}%{DHCPIPORMAC}%{SPACE}((from|to)%{SPACE})?%{DHCPIPORMAC}?(\(%{DHCPIPORMAC}\))?%{SPACE}(\(%{USER:user_machine}\))?%{SPACE}?(via|from)%{SPACE}((%{DHCPGATEWAY}%{DHCPMESSAGE})|%{USERNAME:dhcp_client_interface}) | |
| DHCPIPSUBNET (?<![0-9])(?:(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2}))[\/]%{INT} | |
| DHCPDDUP (%{IPV4:dhcp_client_ip})%{GREEDYDATA}(%{COMMONMAC:dhcp_client_mac})%{GREEDYDATA}(%{DHCPIPSUBNET:dhcp_subnet}) | |
| DHCPDINFO %{GREEDYDATA:dhcp_message} | |
| DHCPDPOOL pool (%{GREEDYDATA:dhcp_pool})(%{DHCPIPSUBNET:dhcp_subnet})%{GREEDYDATA:dhcp_message} |
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