3 Lens for parsing DNS zone files
6 Kaarle Ritvanen <kaarle.ritvanen@datakunkku.fi>
9 RFC 1035, RFC 2782, RFC 3403
12 This file is licensed under the LGPL v2+
19 let eol = del /([ \t\n]*(;[^\n]*)?\n)+/ "\n"
20 let opt_eol = del /([ \t\n]*(;[^\n]*)?\n)*/ ""
22 let ws = del /[ \t]+|(([ \t\n]*;[^\n]*)?\n)+[ \t]*/ " "
23 let opt_ws = del /(([ \t\n]*;[^\n]*)?\n)*[ \t]*/ ""
25 let token = /([^ \t\n";()\\]|\\\\.)+|"([^"\\]|\\\\.)*"/
28 let control = [ key /\$[^ \t\n\/]+/
34 let labeled_token (lbl:string) (re:regexp) (sep:lens) =
35 [ label lbl . store re . sep ]
37 let regexp_token (lbl:string) (re:regexp) =
38 labeled_token lbl re Util.del_ws_tab
40 let type_token (re:regexp) = regexp_token "type" re
42 let simple_token (lbl:string) = regexp_token lbl token
44 let enclosed_token (lbl:string) = labeled_token lbl token ws
46 let last_token (lbl:string) = labeled_token lbl token eol
51 let ttl = regexp_token "ttl" /[0-9]+[DHMWdhmw]?/
52 let class = regexp_token "class" class_re
55 let simple_type = /[A-Z]+/ - class_re - /MX|NAPTR|SOA|SRV/
56 in type_token simple_type . last_token "rdata"
59 let mx = type_token "MX"
60 . simple_token "priority"
61 . last_token "exchange"
63 let naptr = type_token "NAPTR"
64 . simple_token "order"
65 . simple_token "preference"
66 . simple_token "flags"
67 . simple_token "service"
68 . simple_token "regexp"
69 . last_token "replacement"
71 let soa = type_token "SOA"
72 . simple_token "mname"
73 . simple_token "rname"
76 . enclosed_token "serial"
77 . enclosed_token "refresh"
78 . enclosed_token "retry"
79 . enclosed_token "expiry"
80 . labeled_token "minimum" token opt_ws
84 let srv = type_token "SRV"
85 . simple_token "priority"
86 . simple_token "weight"
91 let record = seq "owner"
92 . ((ttl? . class?) | (class . ttl))
93 . (rr|mx|naptr|soa|srv)
94 let ws_record = [ Util.del_ws_tab . record ]
95 let records (k:regexp) = [ key k . counter "owner" . ws_record+ ]
97 let any_record_block = records /[^ \t\n;\/$][^ \t\n;\/]*/
98 let non_root_records = records /@[^ \t\n;\/]+|[^ \t\n;\/$@][^ \t\n;\/]*/
100 let root_records = [ del /@?/ "@"
109 . ( (root_records|non_root_records)
110 . (control|any_record_block)* )?
112 let filter = incl "/var/bind/pri/*.zone"
113 let xfm = transform Dns_Zone.lns filter