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update-dns.el
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update-dns.el
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;;; update-dns.el --- Update serial number in DNS files
;; Copyright (C) 1994, 2000 Roland McGrath
;; Copyright (C) 1999, 2000 Noah Friedman
;; Author: Roland McGrath <roland@frob.com>
;; Maintainer: Noah Friedman <friedman@splode.com>
;; Keywords: extensions
;; $Id: update-dns.el,v 1.3 2000/02/11 00:51:00 friedman Exp $
;; This program 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 program 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 program; if not, you can either send email to this
;; program's maintainer or write to: The Free Software Foundation,
;; Inc.; 59 Temple Place, Suite 330; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Every time you change the data in a DNS file, no matter how trivial the
;; change, make sure you increase the serial number.
;; Serial field is should be YYYYMMDDNN where NN is the update within a day.
;; This program depends on a comment of the form "Serial (YYYYMMDDNN)", which
;; should be structured as in this example:
;;
;; @ IN SOA ns.foo.com. hostmaster.foo.com. (
;; 1994102100 ; Serial (YYYYMMDDNN)
;; 3600 ; Refresh
;; 300 ; Retry
;; 3600000 ; Expire
;; 3600 ) ; Minumum
;; IN NS ns.foo.com.
;; IN NS secondary-ns.elsewhere.com.
;; Put these local variables at the bottom of DNS files.
;;
;; local variables:
;; eval: (if (fboundp 'update-dns-serial) (add-hook (make-local-variable 'write-file-hooks) 'update-dns-serial))
;; End:
;;; Code:
(provide 'update-dns)
(defvar update-dns-serial-fts-format
'(("YYYYMMDDNN" "%Y%m%d" 2)
("YYMMDDNN" "%y%m%d" 2)
;; This was a typo that one of the authors introduced into his serial
;; number at one point. Don't use this.
("2YYYYMMDDN" "2%Y%m%d" 1))
"*Format strings for `format-time-string'")
(defun update-dns-serial ()
(interactive)
(if (or (interactive-p)
(y-or-n-p "Update DNS serial number? "))
(save-excursion
(save-restriction
(save-match-data
(widen)
(goto-char (point-min))
(cond ((let ((case-fold-search t))
(re-search-forward
"^\\s-*\\([0-9]+\\)\\s-*;\\s-*serial[^(]*(\\([^)]*\\))"
nil t))
(let* ((fmt (or (assoc (match-string 2)
update-dns-serial-fts-format)
(error "unknown serial number format")))
(today (format-time-string (nth 1 fmt)))
(iwidth (nth 2 fmt))
(prev (match-string 1))
(old-day (substring prev 0 (- iwidth)))
(oincr (string-to-int (substring prev (- iwidth))))
(incr (format (format "%%0%dd" iwidth)
(if (string= old-day today)
(1+ oincr)
0))))
(goto-char (match-beginning 1))
(delete-region (match-beginning 1) (match-end 1))
(insert today incr))))))))
;; Always return nil in case we are put on write-file-hooks.
nil)
;; The preceding form feed prevents emacs from evaluating the local
;; variables example in the commentary.
;;; update-dns.el ends here