modules: dhcp: Add an mgmt module for managing dhcpd

This is not perfect, but it's a good start, and it shows how a module
might be structured.

modules/dhcp/files/dhcpd.conf.tmpl

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+#
+#	This file has been generated by mgmt config. Do not edit.
+#
+
+# DHCP Server Configuration file.
+#   see /usr/share/doc/dhcp-server/dhcpd.conf.example
+#   see dhcpd.conf(5) man page
+#
+
+#
+#	global option definitions
+#
+{{ if .domain -}}
+option domain-name "{{ .domain }}";
+{{ end -}}
+{{ if .dns -}}
+option domain-name-servers {{ .dns }};
+{{ end -}}
+
+#
+#	dhcpd settings
+#
+{{ if .omapiport -}}
+#omapi-port {{ .omapiport }}; # FIXME !
+{{ end -}}
+{{ if .serveridentifier -}}
+#server-identifier {{ .serveridentifier }}; # FIXME !
+{{ end -}}
+default-lease-time {{ .defaultleasetime }};
+max-lease-time {{ .maxleasetime }};
+
+# Use this to enable / disable dynamic dns updates globally.
+#ddns-update-style none;
+
+# If this DHCP server is the official DHCP server for the local
+# network, the authoritative directive should be uncommented.
+{{ if .authoritative -}}
+authoritative;
+{{ else -}}
+#authoritative; # not authoritative!
+{{ end -}}
+
+# Use this to send dhcp log messages to a different log file (you also
+# have to hack syslog.conf to complete the redirection).
+log-facility local7;
+
+#
+#	include all the subnet definitions
+#
+include "/etc/dhcp/subnets.conf";
+
+#
+#	include all the hosts
+#
+include "/etc/dhcp/hosts.conf";

modules/dhcp/files/host.frag.tmpl

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+{{/* newline for host spacing */}}
+# host: {{ .name }}
+host {{ .name }} {
+	hardware ethernet {{ .macaddress }};
+	fixed-address {{ .valid_fixedaddress }};
+{{- if .hostname }}
+	option host-name "{{ .hostname }}";
+{{ end -}}
+{{- if .nextserver }}
+	next-server {{ .nextserver }};
+{{ end -}}
+{{- if .filename }}
+	filename "{{ .filename }}";
+{{ end -}}
+{{- if .veo }}
+	filename "{{ .filename }}";
+	option vendor-encapsulated-options {{ .veo }};
+{{ end -}}
+}

modules/dhcp/files/hosts.header

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+#
+#	This has been generated by mgmt config. Do not edit.
+#

modules/dhcp/files/subnet.frag.tmpl

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+{{/* newline for subnet spacing */}}
+#
+#	{{ .name }} subnet
+#
+subnet {{ .network }} netmask {{ .netmask }} {
+	option subnet-mask {{ .netmask }};
+{{- if .broadcast }}
+	option broadcast-address {{ .broadcast }};
+{{ end -}}
+{{- if .router }}
+	option routers {{ .router }};
+{{ end -}}
+{{- if .dns }}
+	option domain-name-servers {{ .dns }};
+{{ end -}}
+{{- if .nextserver }}
+	next-server {{ .nextserver }};
+{{ end -}}
+{{- if .filename }}
+	filename "{{ .filename }}";
+{{ end -}}
+{{- if .serveridentifier }}
+	server-identifier {{ .serveridentifier }};
+{{ end -}}
+{{- if .defaultleasetime }}
+	default-lease-time {{ .defaultleasetime }};
+{{ end -}}
+{{- if .maxleasetime }}
+	max-lease-time {{ .maxleasetime }};
+{{ end -}}
+{{- if .range }}
+	range {{ .range }};
+{{ end -}}
+}

modules/dhcp/files/subnets.header

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+#
+#	This has been generated by mgmt config. Do not edit.
+#