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(*
* Module: Xinetd
* Parses xinetd configuration files
*
* The structure of the lens and allowed attributes are ripped directly
* from xinetd's parser in xinetd/parse.c in xinetd's source checkout
* The downside of being so precise here is that if attributes are added
* they need to be added here, too. Writing a catchall entry, and getting
* to typecheck correctly would be a huge pain.
*
* A really enterprising soul could tighten this down even further by
* restricting the acceptable values for each attribute.
*
* Author: David Lutterkort
*)
module Xinetd =
autoload xfm
let opt_spc = Util.del_opt_ws " "
let spc_equal = opt_spc . Sep.equal
let op = ([ label "add" . opt_spc . Util.del_str "+=" ]
|[ label "del" . opt_spc . Util.del_str "-=" ]
| spc_equal)
let value = store Rx.no_spaces
let indent = del Rx.opt_space "\t"
let attr_one (n:regexp) =
Build.key_value n Sep.space_equal value
let attr_lst (n:regexp) (op_eq: lens) =
let value_entry = [ label "value" . value ] in
Build.key_value n op_eq (opt_spc . Build.opt_list value_entry Sep.space)?
let attr_lst_eq (n:regexp) = attr_lst n spc_equal
let attr_lst_op (n:regexp) = attr_lst n op
(* Variable: service_attr
* Note:
* It is much faster to combine, for example, all the attr_one
* attributes into one regexp and pass that to a lens instead of
* using lens union (attr_one "a" | attr_one "b"|..) because the latter
* causes the type checker to work _very_ hard.
*)
let service_attr =
attr_one (/socket_type|protocol|wait|user|group|server|instances/i
|/rpc_version|rpc_number|id|port|nice|banner|bind|interface/i
|/per_source|groups|banner_success|banner_fail|disable|max_load/i
|/rlimit_as|rlimit_cpu|rlimit_data|rlimit_rss|rlimit_stack|v6only/i
|/deny_time|umask|mdns|libwrap/i)
(* redirect and cps aren't really lists, they take exactly two values *)
|attr_lst_eq (/server_args|log_type|access_times|type|flags|redirect|cps/i)
|attr_lst_op (/log_on_success|log_on_failure|only_from|no_access|env|passenv/i)
let default_attr =
attr_one (/instances|banner|bind|interface|per_source|groups/i
|/banner_success|banner_fail|max_load|v6only|umask|mdns/i)
|attr_lst_eq /cps/i (* really only two values, not a whole list *)
|attr_lst_op (/log_type|log_on_success|log_on_failure|disabled/i
|/no_access|only_from|passenv|enabled/i)
(* View: body
* Note:
* We would really like to say "the body can contain any of a list
* of a list of attributes, each of them at most once"; but that
* would require that we build a lens that matches the permutation
* of all attributes; with around 40 individual attributes, that's
* not computationally feasible, even if we didn't have to worry
* about how to write that down. The resulting regular expressions
* would simply be prohibitively large.
*)
let body (attr:lens) = Build.block_newlines_spc
(indent . attr . Util.eol)
Util.comment
(* View: includes
* Note:
* It would be nice if we could use the directories given in include and
* includedir directives to parse additional files instead of hardcoding
* all the places where xinetd config files can be found; but that is
* currently not possible, and implementing that has a good amount of
* hairy corner cases to consider.
*)
let includes =
Build.key_value_line /include(dir)?/ Sep.space (store Rx.no_spaces)
let service =
let sto_re = /[^# \t\n\/]+/ in
Build.key_value_line "service" Sep.space (store sto_re . body service_attr)
let defaults = [ key "defaults" . body default_attr . Util.eol ]
let lns = ( Util.empty | Util.comment | includes | defaults | service )*
let filter = incl "/etc/xinetd.d/*"
. incl "/etc/xinetd.conf"
. Util.stdexcl
let xfm = transform lns filter
(* Local Variables: *)
(* mode: caml *)
(* End: *)