88 lines
2.6 KiB
Plaintext
88 lines
2.6 KiB
Plaintext
module Iptables =
|
|
autoload xfm
|
|
|
|
(*
|
|
Module: Iptables
|
|
Parse the iptables file format as produced by iptables-save. The
|
|
resulting tree is fairly simple; in particular a rule is simply
|
|
a long list of options/switches and their values (if any)
|
|
|
|
This lens should be considered experimental
|
|
*)
|
|
|
|
let comment = Util.comment
|
|
let empty = Util.empty
|
|
let eol = Util.eol
|
|
let spc = Util.del_ws_spc
|
|
let dels = Util.del_str
|
|
|
|
let chain_name = store /[A-Za-z0-9_-]+/
|
|
let chain =
|
|
let policy = [ label "policy" . store /ACCEPT|DROP|REJECT|-/ ] in
|
|
let counters_eol = del /[ \t]*(\[[0-9:]+\])?[ \t]*\n/ "\n" in
|
|
[ label "chain" .
|
|
dels ":" . chain_name . spc . policy . counters_eol ]
|
|
|
|
let param (long:string) (short:string) =
|
|
[ label long .
|
|
spc . del (/--/ . long | /-/ . short) ("-" . short) . spc .
|
|
store /(![ \t]*)?[^ \t\n!-][^ \t\n]*/ ]
|
|
|
|
(* A negatable parameter, which can either be FTW
|
|
! --param arg
|
|
or
|
|
--param ! arg
|
|
*)
|
|
let neg_param (long:string) (short:string) =
|
|
[ label long .
|
|
[ spc . dels "!" . label "not" ]? .
|
|
spc . del (/--/ . long | /-/ . short) ("-" . short) . spc .
|
|
store /(![ \t]*)?[^ \t\n!-][^ \t\n]*/ ]
|
|
|
|
let tcp_flags =
|
|
let flags = /SYN|ACK|FIN|RST|URG|PSH|ALL|NONE/ in
|
|
let flag_list (name:string) =
|
|
Build.opt_list [label name . store flags] (dels ",") in
|
|
[ label "tcp-flags" .
|
|
spc . dels "--tcp-flags" .
|
|
spc . flag_list "mask" . spc . flag_list "set" ]
|
|
|
|
(* misses --set-counters *)
|
|
let ipt_match =
|
|
let any_key = /[a-zA-Z-][a-zA-Z0-9-]+/ -
|
|
/protocol|source|destination|jump|goto|in-interface|out-interface|fragment|match|tcp-flags/ in
|
|
let any_val = /([^" \t\n!-][^ \t\n]*)|"([^"\\\n]|\\\\.)*"/ in
|
|
let any_param =
|
|
[ [ spc . dels "!" . label "not" ]? .
|
|
spc . dels "--" . key any_key . (spc . store any_val)? ] in
|
|
(neg_param "protocol" "p"
|
|
|neg_param "source" "s"
|
|
|neg_param "destination" "d"
|
|
|param "jump" "j"
|
|
|param "goto" "g"
|
|
|neg_param "in-interface" "i"
|
|
|neg_param "out-interface" "o"
|
|
|neg_param "fragment" "f"
|
|
|param "match" "m"
|
|
|tcp_flags
|
|
|any_param)*
|
|
|
|
let chain_action (n:string) (o:string) =
|
|
[ label n .
|
|
del (/--/ . n | o) o .
|
|
spc . chain_name . ipt_match . eol ]
|
|
|
|
let table_rule = chain_action "append" "-A"
|
|
| chain_action "insert" "-I"
|
|
| empty
|
|
|
|
|
|
let table = [ del /\*/ "*" . label "table" . store /[a-z]+/ . eol .
|
|
(chain|comment|table_rule)* .
|
|
dels "COMMIT" . eol ]
|
|
|
|
let lns = (comment|empty|table)*
|
|
let xfm = transform lns (incl "/etc/sysconfig/iptables"
|
|
. incl "/etc/sysconfig/iptables.save"
|
|
. incl "/etc/iptables-save")
|