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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: *)