zone.lisp: Output format for Daniel Bernstein's `tinydns' server.

[zone] / zone.lisp

diff --git a/zone.lisp b/zone.lisp
index ea7a2f1cb1d1a20e6261332b53a7ec3d2cd5ef64..2228c075f71c911e66e1c9b3796bc502ef53189e 100644 (file)
--- a/zone.lisp
+++ b/zone.lisp
@@ -1080,4 +1080,90 @@ (defmethod bind-record (type zr)
                        (bind-record-type type)
                        format args)))
 
+;;;--------------------------------------------------------------------------
+;;; tinydns-data output format.
+
+(defun tinydns-output (code &rest fields)
+  (format *zone-output-stream* "~C~{~@[~A~]~^:~}~%" code fields))
+
+(defun tinydns-raw-record (type zr data)
+  (tinydns-output #\: (zr-name zr) type
+                 (with-output-to-string (out)
+                   (dotimes (i (length data))
+                     (let ((byte (aref data i)))
+                       (if (or (<= byte 32)
+                               (>= byte 128)
+                               (member byte '(#\: #\\) :key #'char-code))
+                           (format out "\\~3,'0O" byte)
+                           (write-char (code-char byte) out)))))
+                 (zr-ttl zr)))
+
+(defgeneric tinydns-record (type zr)
+  (:method ((type (eql :a)) zr)
+    (tinydns-output #\+ (zr-name zr)
+                   (ipaddr-string (zr-data zr)) (zr-ttl zr)))
+  (:method ((type (eql :aaaa)) zr)
+    (tinydns-output #\3 (zr-name zr)
+                   (format nil "~(~32,'0X~)" (ipaddr-addr (zr-data zr)))
+                   (zr-ttl zr)))
+  (:method ((type (eql :ptr)) zr)
+    (tinydns-output #\^ (zr-name zr) (zr-data zr) (zr-ttl zr)))
+  (:method ((type (eql :cname)) zr)
+    (tinydns-output #\C (zr-name zr) (zr-data zr) (zr-ttl zr)))
+  (:method ((type (eql :ns)) zr)
+    (tinydns-output #\& (zr-name zr) nil (zr-data zr) (zr-ttl zr)))
+  (:method ((type (eql :mx)) zr)
+    (let ((name (car (zr-data zr)))
+         (prio (cdr (zr-data zr))))
+      (tinydns-output #\@ (zr-name zr) nil name prio (zr-ttl zr))))
+  (:method ((type (eql :txt)) zr)
+    (tinydns-raw-record 16 zr
+                       (build-record
+                         (dolist (s (zr-data zr))
+                           (rec-u8 (length s))
+                           (rec-raw-string s)))))
+  (:method ((type (eql :srv)) zr)
+    (destructuring-bind (prio weight port host) (zr-data zr)
+      (tinydns-raw-record 33 zr
+                         (build-record
+                           (rec-u16 prio)
+                           (rec-u16 weight)
+                           (rec-u16 port)
+                           (rec-name host)))))
+  (:method ((type (eql :sshfp)) zr)
+    (destructuring-bind (alg type fpr) (zr-data zr)
+      (tinydns-raw-record 44 zr
+                         (build-record
+                           (rec-u8 alg)
+                           (rec-u8 type)
+                           (do ((i 0 (+ i 2))
+                                (n (length fpr)))
+                               ((>= i n))
+                             (rec-u8 (parse-integer fpr
+                                                    :start i :end (+ i 2)
+                                                    :radix 16))))))))
+
+(defmethod zone-write ((format (eql :tinydns)) zone stream)
+  (format stream "~
+### Zone file `~(~A~)'
+###   (generated ~A)
+~%"
+         (zone-name zone)
+         (iso-date :now :datep t :timep t))
+  (let ((soa (zone-soa zone)))
+    (tinydns-output #\Z
+                   (zone-name zone)
+                   (soa-source soa)
+                   (let* ((name (copy-seq (soa-admin soa)))
+                          (at (position #\@ name)))
+                     (when at (setf (char name at) #\.))
+                     name)
+                   (soa-serial soa)
+                   (soa-refresh soa)
+                   (soa-expire soa)
+                   (soa-min-ttl soa)
+                   (zone-default-ttl zone)))
+  (dolist (zr (zone-records zone))
+    (tinydns-record (zr-type zr) zr)))
+
 ;;;----- That's all, folks --------------------------------------------------