--- /dev/null
+;;; dig.el --- Domain Name System dig interface
+;; Copyright (c) 2000 Free Software Foundation, Inc.
+
+;; Author: Simon Josefsson <simon@josefsson.org>
+;; Keywords: DNS BIND dig
+
+;; This file is not a part of GNU Emacs, but the same permissions apply.
+
+;; GNU Emacs 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.
+
+;; GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This provide an interface for "dig".
+;;
+;; For interactive use, try M-x dig and type a hostname. Use `q' to quit
+;; dig buffer.
+;;
+;; For use in elisp programs, call `dig-invoke' and use
+;; `dig-extract-rr' to extract resource records.
+
+;;; Code:
+
+(eval-when-compile (require 'cl))
+
+(defgroup dig nil
+ "Dig configuration.")
+
+(defcustom dig-program "dig"
+ "Name of dig (domain information groper) binary."
+ :type 'file
+ :group 'dig)
+
+(defcustom dig-dns-server nil
+ "DNS server to query.
+If nil, use system defaults."
+ :type '(choice (const :tag "System defaults")
+ string)
+ :group 'dig)
+
+(defcustom dig-font-lock-keywords
+ '(("^;; [A-Z]+ SECTION:" 0 font-lock-keyword-face)
+ ("^;;.*" 0 font-lock-comment-face)
+ ("^; <<>>.*" 0 font-lock-type-face)
+ ("^;.*" 0 font-lock-function-name-face))
+ "Default expressions to highlight in dig mode."
+ :type 'sexp
+ :group 'dig)
+
+(defun dig-invoke (domain &optional
+ query-type query-class query-option
+ dig-option server)
+ "Call dig with given arguments and return buffer containing output.
+DOMAIN is a string with a DNS domain. QUERY-TYPE is an optional string
+with a DNS type. QUERY-CLASS is an optional string with a DNS class.
+QUERY-OPTION is an optional string with dig \"query options\".
+DIG-OPTIONS is an optional string with parameters for the dig program.
+SERVER is an optional string with a domain name server to query.
+
+Dig is an external program found in the BIND name server distribution,
+and is a commonly available debugging tool."
+ (let (buf cmdline)
+ (setq buf (generate-new-buffer "*dig output*"))
+ (if dig-option (push dig-option cmdline))
+ (if query-option (push query-option cmdline))
+ (if query-class (push query-class cmdline))
+ (if query-type (push query-type cmdline))
+ (push domain cmdline)
+ (if server (push (concat "@" server) cmdline)
+ (if dig-dns-server (push (concat "@" dig-dns-server) cmdline)))
+ (apply 'call-process dig-program nil buf nil cmdline)
+ buf))
+
+(defun dig-extract-rr (domain &optional type class)
+ "Extract resource records for DOMAIN, TYPE and CLASS from buffer.
+Buffer should contain output generated by `dig-invoke'."
+ (save-excursion
+ (goto-char (point-min))
+ (if (re-search-forward
+ (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+"
+ (upcase (or class "IN")) "[\t ]+" (upcase (or type "A")))
+ nil t)
+ (let (b e)
+ (end-of-line)
+ (setq e (point))
+ (beginning-of-line)
+ (setq b (point))
+ (when (search-forward " (" e t)
+ (search-forward " )"))
+ (end-of-line)
+ (setq e (point))
+ (buffer-substring b e))
+ (and (re-search-forward (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+"
+ (upcase (or class "IN"))
+ "[\t ]+CNAME[\t ]+\\(.*\\)$") nil t)
+ (dig-extract-rr (match-string 1) type class)))))
+
+(defun dig-rr-get-pkix-cert (rr)
+ (let (b e str)
+ (string-match "[^\t ]+[\t ]+[0-9wWdDhHmMsS]+[\t ]+IN[\t ]+CERT[\t ]+\\(1\\|PKIX\\)[\t ]+[0-9]+[\t ]+[0-9]+[\t ]+(?" rr)
+ (setq b (match-end 0))
+ (string-match ")" rr)
+ (setq e (match-beginning 0))
+ (setq str (substring rr b e))
+ (while (string-match "[\t \n\r]" str)
+ (setq str (replace-match "" nil nil str)))
+ str))
+
+;; XEmacs does it like this. For Emacs, we have to set the
+;; `font-lock-defaults' buffer-local variable.
+(put 'dig-mode 'font-lock-defaults '(dig-font-lock-keywords t))
+
+(put 'dig-mode 'mode-class 'special)
+
+(defvar dig-mode-map nil)
+(unless dig-mode-map
+ (setq dig-mode-map (make-sparse-keymap))
+ (suppress-keymap dig-mode-map)
+
+ (define-key dig-mode-map "q" 'dig-exit))
+
+(defun dig-mode ()
+ "Major mode for displaying dig output."
+ (interactive)
+ (kill-all-local-variables)
+ (setq mode-name "dig")
+ (setq major-mode 'dig-mode)
+ (use-local-map dig-mode-map)
+ (buffer-disable-undo)
+ (unless (featurep 'xemacs)
+ (set (make-local-variable 'font-lock-defaults)
+ '(dig-font-lock-keywords t)))
+ (when (featurep 'font-lock)
+ (font-lock-set-defaults)))
+
+(defun dig-exit ()
+ "Quit dig output buffer."
+ (interactive)
+ (kill-buffer (current-buffer)))
+
+(defun dig (domain &optional
+ query-type query-class query-option dig-option server)
+ "Query addresses of a DOMAIN using dig, by calling `dig-invoke'.
+Optional arguments are passed to `dig-invoke'."
+ (interactive "sHost: ")
+ (switch-to-buffer
+ (dig-invoke domain query-type query-class query-option dig-option server))
+ (goto-char (point-min))
+ (and (search-forward ";; ANSWER SECTION:" nil t)
+ (forward-line))
+ (dig-mode)
+ (setq buffer-read-only t)
+ (set-buffer-modified-p nil))
+
+(provide 'dig)
+
+;;; dig.el ends here
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