chiark / gitweb /
zone: Allow record parsers more control over the names they produce.
[zone] / zone.lisp
CommitLineData
7e282fb5 1;;; -*-lisp-*-
2;;;
3;;; $Id$
4;;;
5;;; DNS zone generation
6;;;
7;;; (c) 2005 Straylight/Edgeware
8;;;
9
10;;;----- Licensing notice ---------------------------------------------------
11;;;
12;;; This program is free software; you can redistribute it and/or modify
13;;; it under the terms of the GNU General Public License as published by
14;;; the Free Software Foundation; either version 2 of the License, or
15;;; (at your option) any later version.
7fff3797 16;;;
7e282fb5 17;;; This program is distributed in the hope that it will be useful,
18;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
19;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20;;; GNU General Public License for more details.
7fff3797 21;;;
7e282fb5 22;;; You should have received a copy of the GNU General Public License
23;;; along with this program; if not, write to the Free Software Foundation,
24;;; Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
25
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26;;;--------------------------------------------------------------------------
27;;; Packaging.
28
7e282fb5 29(defpackage #:zone
85c39c01 30 (:use #:common-lisp #:mdw.base #:mdw.str #:collect #:safely #:net)
9c44003b 31 (:export #:soa #:mx #:zone #:zone-record #:zone-subdomain
7e282fb5 32 #:*default-zone-source* #:*default-zone-refresh*
33 #:*default-zone-retry* #:*default-zone-expire*
34 #:*default-zone-min-ttl* #:*default-zone-ttl*
35 #:*default-mx-priority* #:*default-zone-admin*
ab87c7bf 36 #:*zone-output-path*
5fbfaf49 37 #:zone-find #:zone-parse #:zone-write #:zone-create #:defzone
5bf80328 38 #:defrevzone #:zone-save #:zone-make-name
a15288b4 39 #:defzoneparse #:zone-parse-host
7e282fb5 40 #:timespec-seconds #:make-zone-serial))
fe5fb85a 41
7e282fb5 42(in-package #:zone)
43
fe5fb85a 44;;;--------------------------------------------------------------------------
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45;;; Various random utilities.
46
47(defun to-integer (x)
48 "Convert X to an integer in the most straightforward way."
49 (floor (rational x)))
50
51(defun from-mixed-base (base val)
52 "BASE is a list of the ranges for the `digits' of a mixed-base
2f1d381d 53 representation. Convert VAL, a list of digits, into an integer."
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54 (do ((base base (cdr base))
55 (val (cdr val) (cdr val))
56 (a (car val) (+ (* a (car base)) (car val))))
57 ((or (null base) (null val)) a)))
58
59(defun to-mixed-base (base val)
60 "BASE is a list of the ranges for the `digits' of a mixed-base
2f1d381d 61 representation. Convert VAL, an integer, into a list of digits."
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62 (let ((base (reverse base))
63 (a nil))
64 (loop
65 (unless base
66 (push val a)
67 (return a))
68 (multiple-value-bind (q r) (floor val (pop base))
69 (push r a)
70 (setf val q)))))
71
72(defun timespec-seconds (ts)
73 "Convert a timespec TS to seconds. A timespec may be a real count of
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74 seconds, or a list (COUNT UNIT): UNIT may be any of a number of obvious
75 time units."
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76 (cond ((null ts) 0)
77 ((realp ts) (floor ts))
78 ((atom ts)
79 (error "Unknown timespec format ~A" ts))
80 ((null (cdr ts))
81 (timespec-seconds (car ts)))
82 (t (+ (to-integer (* (car ts)
83 (case (intern (string-upcase
84 (stringify (cadr ts)))
85 '#:zone)
86 ((s sec secs second seconds) 1)
87 ((m min mins minute minutes) 60)
88 ((h hr hrs hour hours) #.(* 60 60))
89 ((d dy dys day days) #.(* 24 60 60))
90 ((w wk wks week weeks) #.(* 7 24 60 60))
91 ((y yr yrs year years) #.(* 365 24 60 60))
92 (t (error "Unknown time unit ~A"
93 (cadr ts))))))
94 (timespec-seconds (cddr ts))))))
95
96(defun hash-table-keys (ht)
97 "Return a list of the keys in hashtable HT."
98 (collecting ()
99 (maphash (lambda (key val) (declare (ignore val)) (collect key)) ht)))
100
101(defun iso-date (&optional time &key datep timep (sep #\ ))
102 "Construct a textual date or time in ISO format. The TIME is the universal
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103 time to convert, which defaults to now; DATEP is whether to emit the date;
104 TIMEP is whether to emit the time, and SEP (default is space) is how to
105 separate the two."
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106 (multiple-value-bind
107 (sec min hr day mon yr dow dstp tz)
108 (decode-universal-time (if (or (null time) (eq time :now))
109 (get-universal-time)
110 time))
111 (declare (ignore dow dstp tz))
112 (with-output-to-string (s)
113 (when datep
114 (format s "~4,'0D-~2,'0D-~2,'0D" yr mon day)
115 (when timep
116 (write-char sep s)))
117 (when timep
118 (format s "~2,'0D:~2,'0D:~2,'0D" hr min sec)))))
119
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120;;;--------------------------------------------------------------------------
121;;; Zone types.
7e282fb5 122
123(defstruct (soa (:predicate soap))
124 "Start-of-authority record information."
125 source
126 admin
127 refresh
128 retry
129 expire
130 min-ttl
131 serial)
fe5fb85a 132
7e282fb5 133(defstruct (mx (:predicate mxp))
134 "Mail-exchange record information."
135 priority
136 domain)
fe5fb85a 137
7e282fb5 138(defstruct (zone (:predicate zonep))
139 "Zone information."
140 soa
141 default-ttl
142 name
143 records)
144
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145;;;--------------------------------------------------------------------------
146;;; Zone defaults. It is intended that scripts override these.
147
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148#+ecl
149(cffi:defcfun gethostname :int
150 (name :pointer)
151 (len :uint))
152
7e282fb5 153(defvar *default-zone-source*
7d593efd 154 (let ((hn #+cmu (unix:unix-gethostname)
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155 #+clisp (unix:get-host-name)
156 #+ecl (cffi:with-foreign-pointer-as-string (buffer 256 len)
157 (let ((rc (gethostname buffer len)))
158 (unless (zerop rc)
159 (error "gethostname(2) failed (rc = ~A)." rc))))))
8a4f9a18 160 (and hn (concatenate 'string (canonify-hostname hn) ".")))
7e282fb5 161 "The default zone source: the current host's name.")
fe5fb85a 162
7e282fb5 163(defvar *default-zone-refresh* (* 24 60 60)
164 "Default zone refresh interval: one day.")
fe5fb85a 165
7e282fb5 166(defvar *default-zone-admin* nil
167 "Default zone administrator's email address.")
fe5fb85a 168
7e282fb5 169(defvar *default-zone-retry* (* 60 60)
170 "Default znoe retry interval: one hour.")
fe5fb85a 171
7e282fb5 172(defvar *default-zone-expire* (* 14 24 60 60)
173 "Default zone expiry time: two weeks.")
fe5fb85a 174
7e282fb5 175(defvar *default-zone-min-ttl* (* 4 60 60)
176 "Default zone minimum TTL/negative TTL: four hours.")
fe5fb85a 177
7e282fb5 178(defvar *default-zone-ttl* (* 8 60 60)
179 "Default zone TTL (for records without explicit TTLs): 8 hours.")
fe5fb85a 180
7e282fb5 181(defvar *default-mx-priority* 50
182 "Default MX priority.")
183
fe5fb85a 184;;;--------------------------------------------------------------------------
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185;;; Zone variables and structures.
186
7e282fb5 187(defvar *zones* (make-hash-table :test #'equal)
188 "Map of known zones.")
fe5fb85a 189
7e282fb5 190(defun zone-find (name)
191 "Find a zone given its NAME."
192 (gethash (string-downcase (stringify name)) *zones*))
fe5fb85a 193
7e282fb5 194(defun (setf zone-find) (zone name)
195 "Make the zone NAME map to ZONE."
196 (setf (gethash (string-downcase (stringify name)) *zones*) zone))
197
198(defstruct (zone-record (:conc-name zr-))
199 "A zone record."
200 (name '<unnamed>)
201 ttl
202 type
7e282fb5 203 data)
204
205(defstruct (zone-subdomain (:conc-name zs-))
206 "A subdomain. Slightly weird. Used internally by zone-process-records
2f1d381d 207 below, and shouldn't escape."
7e282fb5 208 name
209 ttl
210 records)
211
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212(defvar *zone-output-path* *default-pathname-defaults*
213 "Pathname defaults to merge into output files.")
214
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215;;;--------------------------------------------------------------------------
216;;; Zone infrastructure.
217
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218(defun zone-file-name (zone type)
219 "Choose a file name for a given ZONE and TYPE."
220 (merge-pathnames (make-pathname :name (string-downcase zone)
221 :type (string-downcase type))
222 *zone-output-path*))
223
7e282fb5 224(defun zone-process-records (rec ttl func)
225 "Sort out the list of records in REC, calling FUNC for each one. TTL is
2f1d381d 226 the default time-to-live for records which don't specify one."
7e282fb5 227 (labels ((sift (rec ttl)
228 (collecting (top sub)
229 (loop
230 (unless rec
231 (return))
232 (let ((r (pop rec)))
233 (cond ((eq r :ttl)
234 (setf ttl (pop rec)))
235 ((symbolp r)
236 (collect (make-zone-record :type r
237 :ttl ttl
238 :data (pop rec))
239 top))
240 ((listp r)
241 (dolist (name (listify (car r)))
242 (collect (make-zone-subdomain :name name
243 :ttl ttl
244 :records (cdr r))
245 sub)))
246 (t
247 (error "Unexpected record form ~A" (car r))))))))
4e7e3780 248 (process (rec dom ttl)
7e282fb5 249 (multiple-value-bind (top sub) (sift rec ttl)
250 (if (and dom (null top) sub)
251 (let ((s (pop sub)))
252 (process (zs-records s)
253 dom
4e7e3780 254 (zs-ttl s))
7e282fb5 255 (process (zs-records s)
256 (cons (zs-name s) dom)
4e7e3780 257 (zs-ttl s)))
7e282fb5 258 (let ((name (and dom
259 (string-downcase
260 (join-strings #\. (reverse dom))))))
261 (dolist (zr top)
262 (setf (zr-name zr) name)
7e282fb5 263 (funcall func zr))))
264 (dolist (s sub)
265 (process (zs-records s)
266 (cons (zs-name s) dom)
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267 (zs-ttl s))))))
268 (process rec nil ttl)))
7e282fb5 269
270(defun zone-parse-host (f zname)
271 "Parse a host name F: if F ends in a dot then it's considered absolute;
2f1d381d 272 otherwise it's relative to ZNAME."
7e282fb5 273 (setf f (stringify f))
274 (cond ((string= f "@") (stringify zname))
275 ((and (plusp (length f))
276 (char= (char f (1- (length f))) #\.))
277 (string-downcase (subseq f 0 (1- (length f)))))
278 (t (string-downcase (concatenate 'string f "."
279 (stringify zname))))))
7e282fb5 280(defun default-rev-zone (base bytes)
fe5fb85a 281 "Return the default reverse-zone name for the given BASE address and number
2f1d381d 282 of fixed leading BYTES."
7e282fb5 283 (join-strings #\. (collecting ()
284 (loop for i from (- 3 bytes) downto 0
285 do (collect (ipaddr-byte base i)))
286 (collect "in-addr.arpa"))))
287
288(defun zone-name-from-net (net &optional bytes)
289 "Given a NET, and maybe the BYTES to use, convert to the appropriate
2f1d381d 290 subdomain of in-addr.arpa."
7e282fb5 291 (let ((ipn (net-get-as-ipnet net)))
292 (with-ipnet (net mask) ipn
293 (unless bytes
294 (setf bytes (- 4 (ipnet-changeable-bytes mask))))
295 (join-strings #\.
296 (append (loop
297 for i from (- 4 bytes) below 4
298 collect (logand #xff (ash net (* -8 i))))
299 (list "in-addr.arpa"))))))
fe5fb85a 300
7e282fb5 301(defun zone-net-from-name (name)
302 "Given a NAME in the in-addr.arpa space, convert it to an ipnet."
303 (let* ((name (string-downcase (stringify name)))
304 (len (length name))
305 (suffix ".in-addr.arpa")
306 (sufflen (length suffix))
307 (addr 0)
308 (n 0)
309 (end (- len sufflen)))
310 (unless (and (> len sufflen)
311 (string= name suffix :start1 end))
312 (error "`~A' not in ~A." name suffix))
313 (loop
314 with start = 0
315 for dot = (position #\. name :start start :end end)
316 for byte = (parse-integer name
317 :start start
318 :end (or dot end))
319 do (setf addr (logior addr (ash byte (* 8 n))))
320 (incf n)
321 when (>= n 4)
322 do (error "Can't deduce network from ~A." name)
323 while dot
324 do (setf start (1+ dot)))
325 (setf addr (ash addr (* 8 (- 4 n))))
326 (make-ipnet addr (* 8 n))))
327
7e282fb5 328(defun zone-parse-net (net name)
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329 "Given a NET, and the NAME of a domain to guess from if NET is null, return
330 the ipnet for the network."
7e282fb5 331 (if net
332 (net-get-as-ipnet net)
333 (zone-net-from-name name)))
334
335(defun zone-cidr-delg-default-name (ipn bytes)
336 "Given a delegated net IPN and the parent's number of changing BYTES,
2f1d381d 337 return the default deletate zone prefix."
7e282fb5 338 (with-ipnet (net mask) ipn
339 (join-strings #\.
340 (reverse
341 (loop
342 for i from (1- bytes) downto 0
343 until (zerop (logand mask (ash #xff (* 8 i))))
344 collect (logand #xff (ash net (* -8 i))))))))
345
346(defun zone-cidr-delegation (data name ttl list)
347 "Given :cidr-delegation info DATA, for a record called NAME and the current
2f1d381d 348 TTL, write lots of CNAME records to LIST."
7e282fb5 349 (destructuring-bind
350 (net &key bytes)
351 (listify (car data))
352 (setf net (zone-parse-net net name))
353 (unless bytes
354 (setf bytes (ipnet-changeable-bytes (ipnet-mask net))))
355 (dolist (map (cdr data))
356 (destructuring-bind
357 (tnet &optional tdom)
358 (listify map)
359 (setf tnet (zone-parse-net tnet name))
360 (unless (ipnet-subnetp net tnet)
361 (error "~A is not a subnet of ~A."
362 (ipnet-pretty tnet)
7fff3797 363 (ipnet-pretty net)))
7e282fb5 364 (unless tdom
365 (setf tdom
366 (join-strings #\.
367 (list (zone-cidr-delg-default-name tnet bytes)
368 name))))
369 (setf tdom (string-downcase tdom))
370 (dotimes (i (ipnet-hosts tnet))
371 (let* ((addr (ipnet-host tnet i))
372 (tail (join-strings #\.
373 (loop
374 for i from 0 below bytes
375 collect
376 (logand #xff
377 (ash addr (* 8 i)))))))
378 (collect (make-zone-record
379 :name (join-strings #\.
380 (list tail name))
381 :type :cname
382 :ttl ttl
383 :data (join-strings #\. (list tail tdom)))
384 list)))))))
7fff3797 385
fe5fb85a 386;;;--------------------------------------------------------------------------
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387;;; Serial numbering.
388
389(defun make-zone-serial (name)
390 "Given a zone NAME, come up with a new serial number. This will (very
391 carefully) update a file ZONE.serial in the current directory."
392 (let* ((file (zone-file-name name :serial))
393 (last (with-open-file (in file
394 :direction :input
395 :if-does-not-exist nil)
396 (if in (read in)
397 (list 0 0 0 0))))
398 (now (multiple-value-bind
399 (sec min hr dy mon yr dow dstp tz)
400 (get-decoded-time)
401 (declare (ignore sec min hr dow dstp tz))
402 (list dy mon yr)))
403 (seq (cond ((not (equal now (cdr last))) 0)
404 ((< (car last) 99) (1+ (car last)))
405 (t (error "Run out of sequence numbers for ~A" name)))))
406 (safely-writing (out file)
407 (format out
408 ";; Serial number file for zone ~A~%~
409 ;; (LAST-SEQ DAY MONTH YEAR)~%~
410 ~S~%"
411 name
412 (cons seq now)))
413 (from-mixed-base '(100 100 100) (reverse (cons seq now)))))
414
415;;;--------------------------------------------------------------------------
fe5fb85a 416;;; Zone form parsing.
7e282fb5 417
418(defun zone-parse-head (head)
419 "Parse the HEAD of a zone form. This has the form
420
421 (NAME &key :source :admin :refresh :retry
422 :expire :min-ttl :ttl :serial)
423
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424 though a singleton NAME needn't be a list. Returns the default TTL and an
425 soa structure representing the zone head."
7e282fb5 426 (destructuring-bind
427 (zname
428 &key
8a4f9a18 429 (source *default-zone-source*)
7e282fb5 430 (admin (or *default-zone-admin*
431 (format nil "hostmaster@~A" zname)))
432 (refresh *default-zone-refresh*)
433 (retry *default-zone-retry*)
434 (expire *default-zone-expire*)
435 (min-ttl *default-zone-min-ttl*)
436 (ttl min-ttl)
437 (serial (make-zone-serial zname)))
438 (listify head)
439 (values zname
440 (timespec-seconds ttl)
441 (make-soa :admin admin
442 :source (zone-parse-host source zname)
443 :refresh (timespec-seconds refresh)
444 :retry (timespec-seconds retry)
445 :expire (timespec-seconds expire)
446 :min-ttl (timespec-seconds min-ttl)
447 :serial serial))))
448
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449(defun zone-make-name (prefix zone-name)
450 (if (or (not prefix) (string= prefix "@"))
451 zone-name
452 (let ((len (length prefix)))
453 (if (or (zerop len) (char/= (char prefix (1- len)) #\.))
454 (join-strings #\. (list prefix zone-name))
455 prefix))))
456
7e282fb5 457(defmacro defzoneparse (types (name data list
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458 &key (prefix (gensym "PREFIX"))
459 (zname (gensym "ZNAME"))
4e7e3780 460 (ttl (gensym "TTL")))
7e282fb5 461 &body body)
fe5fb85a 462 "Define a new zone record type (or TYPES -- a list of synonyms is
2f1d381d 463 permitted). The arguments are as follows:
fe5fb85a 464
2f1d381d 465 NAME The name of the record to be added.
fe5fb85a 466
2f1d381d 467 DATA The content of the record to be added (a single object,
7fff3797 468 unevaluated).
fe5fb85a 469
2f1d381d 470 LIST A function to add a record to the zone. See below.
fe5fb85a 471
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472 PREFIX The prefix tag used in the original form.
473
2f1d381d 474 ZNAME The name of the zone being constructed.
fe5fb85a 475
2f1d381d 476 TTL The TTL for this record.
fe5fb85a 477
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478 You get to choose your own names for these. ZNAME, PREFIX and TTL are
479 optional: you don't have to accept them if you're not interested.
fe5fb85a 480
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481 The LIST argument names a function to be bound in the body to add a new
482 low-level record to the zone. It has the prototype
fe5fb85a 483
4e7e3780 484 (LIST &key :name :type :data :ttl)
fe5fb85a 485
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486 These default to the above arguments (even if you didn't accept the
487 arguments)."
7e282fb5 488 (setf types (listify types))
489 (let* ((type (car types))
490 (func (intern (format nil "ZONE-PARSE/~:@(~A~)" type))))
2ec279f5 491 (with-parsed-body (body decls doc) body
4e7e3780 492 (with-gensyms (col tname ttype tttl tdata i)
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493 `(progn
494 (dolist (,i ',types)
495 (setf (get ,i 'zone-parse) ',func))
5bf80328 496 (defun ,func (,prefix ,zname ,data ,ttl ,col)
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497 ,@doc
498 ,@decls
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499 (let ((,name (zone-make-name ,prefix ,zname)))
500 (flet ((,list (&key ((:name ,tname) ,name)
501 ((:type ,ttype) ,type)
502 ((:data ,tdata) ,data)
503 ((:ttl ,tttl) ,ttl))
504 (collect (make-zone-record :name ,tname
505 :type ,ttype
506 :data ,tdata
507 :ttl ,tttl)
508 ,col)))
509 ,@body)))
510 ',type)))))
7e282fb5 511
512(defun zone-parse-records (zone records)
513 (let ((zname (zone-name zone)))
514 (with-collection (rec)
515 (flet ((parse-record (zr)
516 (let ((func (or (get (zr-type zr) 'zone-parse)
517 (error "No parser for record ~A."
518 (zr-type zr))))
5bf80328 519 (name (and (zr-name zr) (stringify (zr-name zr)))))
7e282fb5 520 (funcall func
521 name
5bf80328 522 zname
7e282fb5 523 (zr-data zr)
524 (zr-ttl zr)
5bf80328 525 rec))))
7e282fb5 526 (zone-process-records records
527 (zone-default-ttl zone)
7fff3797 528 #'parse-record))
7e282fb5 529 (setf (zone-records zone) (nconc (zone-records zone) rec)))))
530
531(defun zone-parse (zf)
532 "Parse a ZONE form. The syntax of a zone form is as follows:
533
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534 ZONE-FORM:
535 ZONE-HEAD ZONE-RECORD*
7e282fb5 536
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537 ZONE-RECORD:
538 ((NAME*) ZONE-RECORD*)
539 | SYM ARGS"
7e282fb5 540 (multiple-value-bind (zname ttl soa) (zone-parse-head (car zf))
541 (let ((zone (make-zone :name zname
542 :default-ttl ttl
543 :soa soa
544 :records nil)))
545 (zone-parse-records zone (cdr zf))
546 zone)))
547
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548(defun zone-create (zf)
549 "Zone construction function. Given a zone form ZF, construct the zone and
2f1d381d 550 add it to the table."
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551 (let* ((zone (zone-parse zf))
552 (name (zone-name zone)))
553 (setf (zone-find name) zone)
554 name))
555
556(defmacro defzone (soa &rest zf)
557 "Zone definition macro."
558 `(zone-create '(,soa ,@zf)))
559
560(defmacro defrevzone (head &rest zf)
561 "Define a reverse zone, with the correct name."
562 (destructuring-bind
563 (net &rest soa-args)
564 (listify head)
565 (let ((bytes nil))
566 (when (and soa-args (integerp (car soa-args)))
567 (setf bytes (pop soa-args)))
568 `(zone-create '((,(zone-name-from-net net bytes) ,@soa-args) ,@zf)))))
569
570;;;--------------------------------------------------------------------------
571;;; Zone record parsers.
572
4e7e3780 573(defzoneparse :a (name data rec)
7e282fb5 574 ":a IPADDR"
4e7e3780 575 (rec :data (parse-ipaddr data)))
fe5fb85a 576
7e282fb5 577(defzoneparse :ptr (name data rec :zname zname)
578 ":ptr HOST"
579 (rec :data (zone-parse-host data zname)))
fe5fb85a 580
7e282fb5 581(defzoneparse :cname (name data rec :zname zname)
582 ":cname HOST"
583 (rec :data (zone-parse-host data zname)))
fe5fb85a 584
7e282fb5 585(defzoneparse :mx (name data rec :zname zname)
586 ":mx ((HOST :prio INT :ip IPADDR)*)"
587 (dolist (mx (listify data))
588 (destructuring-bind
589 (mxname &key (prio *default-mx-priority*) ip)
590 (listify mx)
591 (let ((host (zone-parse-host mxname zname)))
592 (when ip (rec :name host :type :a :data (parse-ipaddr ip)))
593 (rec :data (cons host prio))))))
fe5fb85a 594
7e282fb5 595(defzoneparse :ns (name data rec :zname zname)
596 ":ns ((HOST :ip IPADDR)*)"
597 (dolist (ns (listify data))
598 (destructuring-bind
599 (nsname &key ip)
600 (listify ns)
601 (let ((host (zone-parse-host nsname zname)))
602 (when ip (rec :name host :type :a :data (parse-ipaddr ip)))
603 (rec :data host)))))
fe5fb85a 604
7e282fb5 605(defzoneparse :alias (name data rec :zname zname)
606 ":alias (LABEL*)"
607 (dolist (a (listify data))
608 (rec :name (zone-parse-host a zname)
609 :type :cname
610 :data name)))
fe5fb85a 611
a15288b4 612(defzoneparse :net (name data rec)
613 ":net (NETWORK*)"
614 (dolist (net (listify data))
615 (let ((n (net-get-as-ipnet net)))
616 (rec :name (zone-parse-host "net" name)
617 :type :a
618 :data (ipnet-net n))
619 (rec :name (zone-parse-host "mask" name)
620 :type :a
621 :data (ipnet-mask n))
622 (rec :name (zone-parse-host "broadcast" name)
623 :type :a
624 :data (ipnet-broadcast n)))))
7fff3797 625
7e282fb5 626(defzoneparse (:rev :reverse) (name data rec)
627 ":reverse ((NET :bytes BYTES) ZONE*)"
628 (setf data (listify data))
629 (destructuring-bind
630 (net &key bytes)
631 (listify (car data))
632 (setf net (zone-parse-net net name))
633 (unless bytes
634 (setf bytes (ipnet-changeable-bytes (ipnet-mask net))))
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635 (let ((seen (make-hash-table :test #'equal)))
636 (dolist (z (or (cdr data)
637 (hash-table-keys *zones*)))
638 (dolist (zr (zone-records (zone-find z)))
639 (when (and (eq (zr-type zr) :a)
640 (ipaddr-networkp (zr-data zr) net))
641 (let ((name (string-downcase
642 (join-strings
643 #\.
644 (collecting ()
645 (dotimes (i bytes)
646 (collect (logand #xff (ash (zr-data zr)
647 (* -8 i)))))
648 (collect name))))))
649 (unless (gethash name seen)
650 (rec :name name :type :ptr
651 :ttl (zr-ttl zr) :data (zr-name zr))
652 (setf (gethash name seen) t)))))))))
7e282fb5 653
654(defzoneparse (:cidr-delegation :cidr) (name data rec)
655 ":cidr-delegation ((NET :bytes BYTES) (TARGET-NET [TARGET-ZONE])*)"
656 (destructuring-bind
657 (net &key bytes)
658 (listify (car data))
659 (setf net (zone-parse-net net name))
660 (unless bytes
661 (setf bytes (ipnet-changeable-bytes (ipnet-mask net))))
662 (dolist (map (cdr data))
663 (destructuring-bind
664 (tnet &optional tdom)
665 (listify map)
666 (setf tnet (zone-parse-net tnet name))
667 (unless (ipnet-subnetp net tnet)
668 (error "~A is not a subnet of ~A."
669 (ipnet-pretty tnet)
7fff3797 670 (ipnet-pretty net)))
7e282fb5 671 (unless tdom
672 (with-ipnet (net mask) tnet
673 (setf tdom
674 (join-strings
675 #\.
676 (append (reverse (loop
677 for i from (1- bytes) downto 0
678 until (zerop (logand mask
679 (ash #xff
680 (* 8 i))))
681 collect (logand #xff
682 (ash net (* -8 i)))))
683 (list name))))))
684 (setf tdom (string-downcase tdom))
685 (dotimes (i (ipnet-hosts tnet))
686 (let* ((addr (ipnet-host tnet i))
687 (tail (join-strings #\.
688 (loop
689 for i from 0 below bytes
690 collect
691 (logand #xff
692 (ash addr (* 8 i)))))))
693 (rec :name (format nil "~A.~A" tail name)
694 :type :cname
695 :data (format nil "~A.~A" tail tdom))))))))
696
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697;;;--------------------------------------------------------------------------
698;;; Zone file output.
7e282fb5 699
700(defun zone-write (zone &optional (stream *standard-output*))
701 "Write a ZONE's records to STREAM."
702 (labels ((fix-admin (a)
703 (let ((at (position #\@ a))
704 (s (concatenate 'string (string-downcase a) ".")))
705 (when s
706 (setf (char s at) #\.))
707 s))
708 (fix-host (h)
709 (if (not h)
710 "@"
711 (let* ((h (string-downcase (stringify h)))
712 (hl (length h))
713 (r (string-downcase (zone-name zone)))
714 (rl (length r)))
715 (cond ((string= r h) "@")
716 ((and (> hl rl)
717 (char= (char h (- hl rl 1)) #\.)
718 (string= h r :start1 (- hl rl)))
719 (subseq h 0 (- hl rl 1)))
720 (t (concatenate 'string h "."))))))
721 (printrec (zr)
722 (format stream "~A~20T~@[~8D~]~30TIN ~A~40T"
723 (fix-host (zr-name zr))
724 (and (/= (zr-ttl zr) (zone-default-ttl zone))
725 (zr-ttl zr))
726 (string-upcase (symbol-name (zr-type zr))))))
727 (format stream "~
728;;; Zone file `~(~A~)'
729;;; (generated ~A)
730
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731$ORIGIN ~0@*~(~A.~)
732$TTL ~2@*~D~2%"
7e282fb5 733 (zone-name zone)
734 (iso-date :now :datep t :timep t)
735 (zone-default-ttl zone))
736 (let ((soa (zone-soa zone)))
737 (format stream "~
738~A~30TIN SOA~40T~A ~A (
739~45T~10D~60T ;serial
740~45T~10D~60T ;refresh
741~45T~10D~60T ;retry
742~45T~10D~60T ;expire
743~45T~10D )~60T ;min-ttl~2%"
744 (fix-host (zone-name zone))
745 (fix-host (soa-source soa))
746 (fix-admin (soa-admin soa))
747 (soa-serial soa)
748 (soa-refresh soa)
749 (soa-retry soa)
750 (soa-expire soa)
751 (soa-min-ttl soa)))
752 (dolist (zr (zone-records zone))
167608ee 753 (ecase (zr-type zr)
7e282fb5 754 (:a
755 (printrec zr)
756 (format stream "~A~%" (ipaddr-string (zr-data zr))))
167608ee 757 ((:ptr :cname :ns)
7e282fb5 758 (printrec zr)
759 (format stream "~A~%" (fix-host (zr-data zr))))
760 (:mx
761 (printrec zr)
762 (let ((mx (zr-data zr)))
763 (format stream "~2D ~A~%" (cdr mx) (fix-host (car mx)))))
764 (:txt
765 (printrec zr)
766 (format stream "~S~%" (stringify (zr-data zr))))))))
767
7e282fb5 768(defun zone-save (zones)
769 "Write the named ZONES to files. If no zones are given, write all the
2f1d381d 770 zones."
7e282fb5 771 (unless zones
772 (setf zones (hash-table-keys *zones*)))
773 (safely (safe)
774 (dolist (z zones)
775 (let ((zz (zone-find z)))
776 (unless zz
777 (error "Unknown zone `~A'." z))
778 (let ((stream (safely-open-output-stream safe
ab87c7bf 779 (zone-file-name z :zone))))
7e282fb5 780 (zone-write zz stream))))))
781
782;;;----- That's all, folks --------------------------------------------------