--- /dev/null
+;;; dns-mode.el --- a mode for viewing/editing Domain Name System master files
+;; Copyright (c) 2000, 2001, 2003, 2004 Free Software Foundation, Inc.
+
+;; Author: Simon Josefsson <simon@josefsson.org>
+;; Keywords: DNS master zone file SOA
+
+;; This file is not part of GNU Emacs.
+
+;; This file is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published
+;; by the Free Software Foundation; either version 2, or (at your
+;; option) any later version.
+
+;; This file is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+;; General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with This file; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; Use M-x dns-mode RET to invoke in master files.
+;;
+;; C-c C-s Increment SOA serial.
+;; Understands YYYYMMDDNN, Unix time, and serial number formats,
+;; and complains if it fail to find SOA serial.
+;;
+;; Put something similar to the following in your ~/.emacs to use this file:
+;;
+;; (load "~/path/to/dns-mode.el")
+;; (setq auto-mode-alist (cons '("\\.soa\\'" . dns-mode) auto-mode-alist))
+
+;;; References:
+
+;; RFC 1034, "DOMAIN NAMES - CONCEPTS AND FACILITIES", P. Mockapetris.
+;; RFC 1035, "DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION", P. Mockapetris.
+
+;;; Release history:
+
+;; 2004-09-11 posted on gnu.emacs.sources
+
+;;; Code:
+
+(defgroup dns-mode nil
+ "DNS master file mode configuration.")
+
+(defconst dns-mode-classes '("IN" "CS" "CH" "HS")
+ "List of strings with known DNS classes.")
+
+(defconst dns-mode-types '("A" "NS" "MD" "MF" "CNAME" "SOA" "MB" "MG" "MR"
+ "NULL" "WKS" "PTR" "HINFO" "MINFO" "MX" "TXT"
+ "RP" "AFSDB" "X25" "ISDN" "RT" "NSAP" "NSAP"
+ "SIG" "KEY" "PX" "GPOS" "AAAA" "LOC" "NXT"
+ "EID" "NIMLOC" "SRV" "ATMA" "NAPTR" "KX" "CERT"
+ "A6" "DNAME" "SINK" "OPT" "APL" "DS" "SSHFP"
+ "RRSIG" "NSEC" "DNSKEY" "UINFO" "UID" "GID"
+ "UNSPEC" "TKEY" "TSIG" "IXFR" "AXFR" "MAILB"
+ "MAILA")
+ "List of strings with known DNS types.")
+
+;; Font lock.
+
+(defvar dns-mode-control-entity-face 'font-lock-keyword-face
+ "Name of face used for control entities, e.g. $ORIGIN.")
+
+(defvar dns-mode-bad-control-entity-face 'font-lock-warning-face
+ "Name of face used for non-standard control entities, e.g. $FOO.")
+
+(defvar dns-mode-type-face 'font-lock-type-face
+ "Name of face used for DNS types, e.g., SOA.")
+
+(defvar dns-mode-class-face 'font-lock-constant-face
+ "Name of face used for DNS classes, e.g., IN.")
+
+(defcustom dns-mode-font-lock-keywords
+ `(("^$ORIGIN" 0 dns-mode-control-entity-face)
+ ("^$INCLUDE" 0 dns-mode-control-entity-face)
+ ("^$[a-z0-9A-Z]+" 0 dns-mode-bad-control-entity-face)
+ (,(regexp-opt dns-mode-classes) 0 dns-mode-class-face)
+ (,(regexp-opt dns-mode-types) 0 dns-mode-type-face))
+ "Font lock keywords used to highlight text in DNS master file mode."
+ :type 'sexp
+ :group 'dns-mode)
+
+;; Syntax table.
+
+(defvar dns-mode-syntax-table
+ (let ((table (make-syntax-table)))
+ (modify-syntax-entry ?\; "< " table)
+ (modify-syntax-entry ?\n "> " table)
+ table)
+ "Syntax table in use in DNS master file buffers.")
+
+;; Keymap.
+
+(defvar dns-mode-map
+ (let ((map (make-sparse-keymap)))
+ (define-key map "\C-c\C-s" 'dns-mode-soa-increment-serial)
+ map)
+ "Keymap for DNS master file mode.")
+
+;; Menu.
+
+(defvar dns-mode-menu nil
+ "Menubar used in DNS master file mode.")
+
+(easy-menu-define dns-mode-menu dns-mode-map
+ "DNS Menu."
+ '("DNS"
+ ["Increment SOA serial" dns-mode-soa-increment-serial t]))
+
+;; Mode.
+
+;;;###autoload
+(define-derived-mode dns-mode text-mode "DNS"
+ "Major mode for viewing and editing DNS master files.
+This mode is inherited from text mode. It add syntax
+highlighting, and some commands for handling DNS master files.
+Its keymap inherits from `text-mode' and it has the same
+variables for customizing indentation. It has its own abbrev
+table and its own syntax table.
+
+Turning on DNS mode runs `dns-mode-hook'."
+ (set (make-local-variable 'comment-start) ";")
+ (set (make-local-variable 'comment-end) "")
+ (set (make-local-variable 'comment-start-skip) ";+ *")
+ (unless (featurep 'xemacs)
+ (set (make-local-variable 'font-lock-defaults)
+ '(dns-mode-font-lock-keywords nil nil ((?_ . "w")))))
+ (easy-menu-add-item nil nil dns-mode-menu))
+
+;; Tools.
+
+;;;###autoload
+(defun dns-mode-soa-increment-serial ()
+ "Locate SOA record and increment the serial field."
+ (interactive)
+ (save-excursion
+ (goto-char (point-min))
+ (unless (re-search-forward
+ (concat "^\\(\\(\\([^ \t]+[ \t]+\\)?[^ \t]+"
+ "[ \t]+\\)?[^ \t]+[ \t]+\\)?SOA") nil t)
+ (error "Cannot locate SOA record"))
+ (if (re-search-forward (concat "\\<\\("
+ ;; year
+ "\\(198\\|199\\|20[0-9]\\)[0-9]"
+ ;; month
+ "\\(0[0-9]\\|10\\|11\\|12\\)"
+ ;; day
+ "\\([012][0-9]\\|30\\|31\\)"
+ ;; counter
+ "\\([0-9]\\{1,3\\}\\)"
+ "\\)\\>")
+ nil t)
+ ;; YYYYMMDDIII format, one to three I's.
+ (let* ((serial (match-string 1))
+ (counterstr (match-string 5))
+ (counter (string-to-number counterstr))
+ (now (format-time-string "%Y%m%d"))
+ (nowandoldserial (concat now counterstr)))
+ (if (string< serial nowandoldserial)
+ (let ((new (format "%s00" now)))
+ (replace-match new nil nil nil 1)
+ (message "Replaced old serial %s with %s" serial new))
+ (if (string= serial nowandoldserial)
+ (let ((new (format (format "%%s%%0%dd" (length counterstr))
+ now (1+ counter))))
+ (replace-match new nil nil nil 1)
+ (message "Replaced old serial %s with %s" serial new))
+ (error "Current SOA serial is in the future"))))
+ (if (re-search-forward "\\<\\([0-9]\\{9,10\\}\\)\\>" nil t)
+ ;; Unix time
+ (let* ((serial (match-string 1))
+ (new (format-time-string "%s")))
+ (if (not (string< serial new))
+ (error "Current SOA serial is in the future")
+ (replace-match new nil nil nil 1)
+ (message "Replaced old serial %s with %s" serial new)))
+ (if (re-search-forward "\\<\\([0-9]+\\)\\>" nil t)
+ ;; Just any serial number.
+ (let* ((serial (match-string 1))
+ (new (format "%d" (1+ (string-to-number serial)))))
+ (replace-match new nil nil nil 1)
+ (message "Replaced old serial %s with %s" serial new))
+ (error "Cannot locate serial number in SOA record"))))))
+
+(provide 'dns-mode)
+
+;;; dns-mode.el ends here
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