;;; dig.el --- Domain Name System dig interface ;; Copyright (c) 2000, 2001, 2003 Free Software Foundation, Inc. ;; Author: Simon Josefsson ;; Keywords: DNS BIND dig ;; This file is part of GNU Emacs. ;; 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. ;;; Release history: ;; 2000-10-28 posted on gnu.emacs.sources ;;; 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)) ;; named for consistency with query-dns in dns.el (defun query-dig (domain &optional query-type query-class query-option dig-option server) "Query addresses of a DOMAIN using dig. It works by calling `dig-invoke' and `dig-extract-rr'. Optional arguments are passed to `dig-invoke' and `dig-extract-rr'. Returns nil for domain/class/type queries that results in no data." (let ((buffer (dig-invoke domain query-type query-class query-option dig-option server))) (when buffer (switch-to-buffer buffer) (let ((digger (dig-extract-rr domain query-type query-class))) (kill-buffer buffer) digger)))) (provide 'dig) ;;; arch-tag: 1d61726e-9400-4013-9ae7-4035e0c7f7d6 ;;; dig.el ends here