Add check command for check_dhcp.

Refs #6225

doc/9-appendix.md

@@ -304,6 +304,21 @@ snmp_address    | **Optional.** The host's address. Defaults to "$address$".
 snmp_oid        | **Optional.** The SNMP OID. Defaults to "1.3.6.1.2.1.1.3.0".
 snmp_community  | **Optional.** The SNMP community. Defaults to "public".
 
+#### <a id="plugin-check-command-dhcp"></a> dhcp
+
+Check command object for the `check_dhcp` plugin.
+
+Custom Attributes:
+
+Name            | Description
+----------------|--------------
+dhcp_serverip   | **Optional.** The IP address of the DHCP server which we should get a response from.
+dhcp_requestedip| **Optional.** The IP address which we should be offered by a DHCP server.
+dhcp_timeout    | **Optional.** The timeout in seconds.
+dhcp_interface  | **Optional.** The interface to use.
+dhcp_mac        | **Optional.** The MAC address to use in the DHCP request.
+dhcp_unicast    | **Optional.** Whether to use unicast requests. Defaults to false.
+
 #### <a id="plugin-check-command-nscp"></a> nscp
 
 Check command object for the `check_nt` plugin.

itl/command-plugins.conf

@@ -287,6 +287,25 @@ object CheckCommand "apt" {
 	]
 }
 
+object CheckCommand "dhcp" {
+	import "plugin-check-command"
+
+	command = PluginDir + "/check_dhcp"
+
+	arguments = {
+		"-s" = "$dhcp_serverip$"
+		"-r" = "$dhcp_requestedip$"
+		"-t" = "$dhcp_timeout$"
+		"-i" = "$dhcp_interface$"
+		"-m" = "$dhcp_mac$"
+		"-u" = {
+			set_if = "$dhcp_unicast$"
+		}
+	}
+
+	vars.dhcp_unicast = false
+}
+
 object CheckCommand "nscp" {
 	import "plugin-check-command"