From e97012de8f47dd6ae68e288b4e983731a3b96b13 Mon Sep 17 00:00:00 2001
From: Mark Wooding <mdw@distorted.org.uk>
Date: Mon, 28 Apr 2014 10:05:20 +0100
Subject: [PATCH] zone.lisp: Output format for Daniel Bernstein's `tinydns'
 server.

---
 zone.lisp | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)

diff --git a/zone.lisp b/zone.lisp
index ea7a2f1..2228c07 100644
--- a/zone.lisp
+++ b/zone.lisp
@@ -1080,4 +1080,90 @@ $TTL ~2@*~D~2%"
 			(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 --------------------------------------------------
-- 
2.11.0