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hosts_access.aug
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(* Module: Hosts_Access Parses /etc/hosts.{allow,deny} Author: Raphael Pinson <raphink@gmail.com> About: Reference This lens tries to keep as close as possible to `man 5 hosts_access` and `man 5 hosts_options` where possible. About: License This file is licenced under the LGPL v2+, like the rest of Augeas. About: Lens Usage To be documented About: Configuration files This lens applies to /etc/hosts.{allow,deny}. See <filter>. *) module Hosts_Access = autoload xfm (************************************************************************ * Group: USEFUL PRIMITIVES *************************************************************************) (* View: colon *) let colon = del /[ \t]*(\\\\[ \t]*\n[ \t]+)?:[ \t]*(\\\\[ \t]*\n[ \t]+)?/ ": " (* Variable: comma_sep *) let comma_sep = /([ \t]|(\\\\\n))*,([ \t]|(\\\\\n))*/ (* Variable: ws_sep *) let ws_sep = / +/ (* View: list_sep *) let list_sep = del ( comma_sep | ws_sep ) ", " (* View: list_item *) let list_item = store ( Rx.word - /EXCEPT/i ) (* View: client_host_item Allows @ for netgroups, supports [ipv6] syntax *) let client_host_item = let client_hostname_rx = /[A-Za-z0-9_.@?*-][A-Za-z0-9_.?*-]*/ in let client_ipv6_rx = "[" . /[A-Za-z0-9:?*%]+/ . "]" in let client_host_rx = client_hostname_rx | client_ipv6_rx in let netmask = [ Util.del_str "/" . label "netmask" . store Rx.word ] in store ( client_host_rx - /EXCEPT/i ) . netmask? (* View: client_file_item *) let client_file_item = let client_file_rx = /\/[^ \t\n,:]+/ in store ( client_file_rx - /EXCEPT/i ) (* Variable: option_kw Since either an option or a shell command can be given, use an explicit list of known options to avoid misinterpreting a command as an option *) let option_kw = "severity" | "spawn" | "twist" | "keepalive" | "linger" | "rfc931" | "banners" | "nice" | "setenv" | "umask" | "user" | /allow/i | /deny/i (* Variable: shell_command_rx *) let shell_command_rx = /[^ \t\n:][^\n]*[^ \t\n]|[^ \t\n:\\\\]/ - ( option_kw . /.*/ ) (* View: sto_to_colon Allows escaped colon sequences *) let sto_to_colon = store /[^ \t\n:=][^\n:]*((\\\\:|\\\\[ \t]*\n[ \t]+)[^\n:]*)*[^ \\\t\n:]|[^ \t\n:\\\\]/ (* View: except * The except operator makes it possible to write very compact rules. *) let except (lns:lens) = [ label "except" . Sep.space . del /except/i "EXCEPT" . Sep.space . lns ] (************************************************************************ * Group: ENTRY TYPES *************************************************************************) (* View: daemon *) let daemon = let host = [ label "host" . Util.del_str "@" . list_item ] in [ label "process" . list_item . host? ] (* View: daemon_list A list of <daemon>s *) let daemon_list = Build.opt_list daemon list_sep (* View: client *) let client = let user = [ label "user" . list_item . Util.del_str "@" ] in [ label "client" . user? . client_host_item ] (* View: client_file *) let client_file = [ label "file" . client_file_item ] (* View: client_list A list of <client>s *) let client_list = Build.opt_list ( client | client_file ) list_sep (* View: option Optional extensions defined in hosts_options(5) *) let option = [ key option_kw . ( del /([ \t]*=[ \t]*|[ \t]+)/ " " . sto_to_colon )? ] (* View: shell_command *) let shell_command = [ label "shell_command" . store shell_command_rx ] (* View: entry *) let entry = [ seq "line" . daemon_list . (except daemon_list)? . colon . client_list . (except client_list)? . ( (colon . option)+ | (colon . shell_command)? ) . Util.eol ] (************************************************************************ * Group: LENS AND FILTER *************************************************************************) (* View: lns *) let lns = (Util.empty | Util.comment | entry)* (* View: filter *) let filter = incl "/etc/hosts.allow" . incl "/etc/hosts.deny" let xfm = transform lns filter