{{Configuring shared daemons with respect to a particular Internet domain name}}

extern type no_spaces;
{{Any string with no space characters}}

extern type no_newlines;
{{Any string with no newline characters}}

extern type ip;
{{An IP address}}
extern type ipv6;
{{An IPv6 address}}

extern type your_ip;
extern val your_ip_to_ip : your_ip -> ip;
{{An IP address that you're authorized to use; e.g., for an SSL web host}}

extern type host;
{{A hostname; that is, (more or less) an alphanumeric string}}

extern type domain;
{{An Internet domain name}}

extern type your_domain;
{{A domain that you're allowed to configure}}

extern type your_domain_host;
{{Some host (as a fully-qualified domain name) in one of your domains}}

extern type node;
{{The name of a server controlled by domtool}}

extern val ip_of_node : node -> ip;
{{Look up the IP address of a node.}}

extern type user;
extern type group;
{{UNIX users and groups}}

extern type your_user;
extern type your_group;
{{UNIX users and groups that you're allowed to run as}}

extern type your_path;
{{A filesystem path that you're allowed to write to.
  The set of permitted values is generated from a set of roots by closing it
  under the subdirectory relation.}}
extern val end_in_slash : your_path -> your_path;
{{Add a slash at the end of a path, if there isn't one already.}}

extern type readable_path;
{{Like [your_path], but also includes some paths that everyone is allowed to
  read.}}

context Domain;
{{Configuration directives specific to an Internet domain}}

extern type serial;
{{Domain zone serial numbers}}
extern val serialAuto : serial;
{{Whenever DNS data changes, choose a sensible serial number automatically.}}
extern val serialConst : int -> serial;
{{Use this particular serial number.}}

extern type soa;
{{DNS start-of-authority record}}
extern val soa : domain -> serial -> int -> int -> int -> int -> soa;

val defaultSoa = soa "deleuze.hcoop.net" serialAuto 86400 1800 1209600 3600;

extern type dns_node;
{{A node offering DNS services}}
extern val dns_node_to_node : dns_node -> node;

extern type master;
{{Information on the master DNS server for a domain}}
extern val externalMaster : ip -> master;
{{A server not controlled by domtool will serve as master.}}
extern val internalMaster : dns_node -> master;
{{A server controlled by domtool will serve as master.}}

extern type dnsKind;
{{How should DNS for this domain be handled?}}
extern val useDns : soa -> master -> [dns_node] -> dnsKind;
{{We do want DNS services for this domain. Specify the SOA record, information
  on the server in charge of zone data, and a list of slave servers.}}
extern val noDns : dnsKind;
{{No DNS services for this domain.}}

extern val domain : your_domain -> Domain => [Root] {Aliases : [your_domain], DNS : dnsKind, TTL : int};
{{Configure a domain to which you have access rights.}}

extern type mail_node;
{{A node offering SMTP services}}
extern val mail_node_to_node : mail_node -> node;

extern val domainHost : host -> [Domain] {} => { Hostname : domain };
{{Appends the current domain onto a host.}}