Hosts_Access

Parses /etc/hosts.{allow,deny}

Summary

Hosts_Access	Parses /etc/hosts.{allow,deny}
Reference	This lens tries to keep as close as possible to `man 5 hosts_access` where possible.
License	This file is licenced under the LGPLv2+, like the rest of Augeas.
Lens Usage	To be documented
Configuration files	This lens applies to /etc/hosts.{allow,deny}.
USEFUL PRIMITIVES
colon
comma
sto_to_eol
except	The except operator makes it possible to write very compact rules.
ENTRY TYPES
daemon
daemon_list	A list of daemons
client
client_list	A list of clients
shell_command
entry
LENS AND FILTER
lns
filter

This lens tries to keep as close as possible to `man 5 hosts_access` where possible.

This file is licenced under the LGPLv2+, like the rest of Augeas.

To be documented

This lens applies to /etc/hosts.{allow,deny}. See filter.

let colon = del /[ \t]*:[ \t]*/ ": "

let comma = del /([ \t]|(\\\\\n))*,([ \t]|(\\\\\n))*/ ", "

let sto_to_eol = store /[^ \t\n:][^\n]*[^ \t\n]|[^ \t\n:]/

let except (lns:lens) = [ label "except" . Sep.space . del /except/i "EXCEPT" . Sep.space . lns ]

The except operator makes it possible to write very compact rules.

let daemon = let host = [ label "host" . Util.del_str "@" . store Rx.word ] in [ label "process" . store Rx.word . host? ]

let daemon_list = Build.opt_list daemon comma

A list of daemons

let client = let user = [ label "user" . store Rx.word . Util.del_str "@" ] in [ label "client" . user? . store Rx.word ]

let client_list = Build.opt_list client comma

A list of clients

let shell_command = [ label "shell_command" . sto_to_eol ]

let entry = [ seq "line" . daemon_list . (except daemon_list)? . colon . client_list . (except client_list)? . (colon . shell_command)? . Util.eol ]

let lns = (Util.empty | Util.comment | entry)*