2007-12-01 20:40:44 +00:00
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;;; dig.el --- Domain Name System dig interface
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;; Copyright (C) 2000, 2001, 2002, 2003, 2004,
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2008-01-07 01:26:07 +00:00
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;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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2007-12-01 20:40:44 +00:00
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;; Author: Simon Josefsson <simon@josefsson.org>
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;; Keywords: DNS BIND dig
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;; This file is part of GNU Emacs.
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2008-05-06 07:31:51 +00:00
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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2007-12-01 20:40:44 +00:00
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2008-05-06 07:31:51 +00:00
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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2007-12-01 20:40:44 +00:00
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;; You should have received a copy of the GNU General Public License
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2008-05-06 07:31:51 +00:00
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;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
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2007-12-01 20:40:44 +00:00
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;;; Commentary:
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;; This provide an interface for "dig".
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;;
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;; For interactive use, try M-x dig and type a hostname. Use `q' to quit
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;; dig buffer.
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;;
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;; For use in elisp programs, call `dig-invoke' and use
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;; `dig-extract-rr' to extract resource records.
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;;; Release history:
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;; 2000-10-28 posted on gnu.emacs.sources
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;;; Code:
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(eval-when-compile (require 'cl))
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(defgroup dig nil
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"Dig configuration."
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:group 'comm)
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(defcustom dig-program "dig"
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"Name of dig (domain information groper) binary."
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:type 'file
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:group 'dig)
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(defcustom dig-dns-server nil
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"DNS server to query.
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If nil, use system defaults."
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:type '(choice (const :tag "System defaults")
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string)
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:group 'dig)
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(defcustom dig-font-lock-keywords
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'(("^;; [A-Z]+ SECTION:" 0 font-lock-keyword-face)
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("^;;.*" 0 font-lock-comment-face)
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("^; <<>>.*" 0 font-lock-type-face)
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("^;.*" 0 font-lock-function-name-face))
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"Default expressions to highlight in dig mode."
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:type 'sexp
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:group 'dig)
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(defun dig-invoke (domain &optional
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query-type query-class query-option
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dig-option server)
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"Call dig with given arguments and return buffer containing output.
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DOMAIN is a string with a DNS domain. QUERY-TYPE is an optional string
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with a DNS type. QUERY-CLASS is an optional string with a DNS class.
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QUERY-OPTION is an optional string with dig \"query options\".
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DIG-OPTIONS is an optional string with parameters for the dig program.
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SERVER is an optional string with a domain name server to query.
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Dig is an external program found in the BIND name server distribution,
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and is a commonly available debugging tool."
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(let (buf cmdline)
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(setq buf (generate-new-buffer "*dig output*"))
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(if dig-option (push dig-option cmdline))
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(if query-option (push query-option cmdline))
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(if query-class (push query-class cmdline))
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(if query-type (push query-type cmdline))
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(push domain cmdline)
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(if server (push (concat "@" server) cmdline)
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(if dig-dns-server (push (concat "@" dig-dns-server) cmdline)))
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(apply 'call-process dig-program nil buf nil cmdline)
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buf))
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(defun dig-extract-rr (domain &optional type class)
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"Extract resource records for DOMAIN, TYPE and CLASS from buffer.
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Buffer should contain output generated by `dig-invoke'."
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(save-excursion
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(goto-char (point-min))
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(if (re-search-forward
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(concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+"
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(upcase (or class "IN")) "[\t ]+" (upcase (or type "A")))
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nil t)
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(let (b e)
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(end-of-line)
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(setq e (point))
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(beginning-of-line)
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(setq b (point))
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(when (search-forward " (" e t)
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(search-forward " )"))
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(end-of-line)
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(setq e (point))
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(buffer-substring b e))
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(and (re-search-forward (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+"
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(upcase (or class "IN"))
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"[\t ]+CNAME[\t ]+\\(.*\\)$") nil t)
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(dig-extract-rr (match-string 1) type class)))))
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(defun dig-rr-get-pkix-cert (rr)
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(let (b e str)
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(string-match "[^\t ]+[\t ]+[0-9wWdDhHmMsS]+[\t ]+IN[\t ]+CERT[\t ]+\\(1\\|PKIX\\)[\t ]+[0-9]+[\t ]+[0-9]+[\t ]+(?" rr)
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(setq b (match-end 0))
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(string-match ")" rr)
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(setq e (match-beginning 0))
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(setq str (substring rr b e))
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(while (string-match "[\t \n\r]" str)
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(setq str (replace-match "" nil nil str)))
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str))
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;; XEmacs does it like this. For Emacs, we have to set the
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;; `font-lock-defaults' buffer-local variable.
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(put 'dig-mode 'font-lock-defaults '(dig-font-lock-keywords t))
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(put 'dig-mode 'mode-class 'special)
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(defvar dig-mode-map nil)
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(unless dig-mode-map
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(setq dig-mode-map (make-sparse-keymap))
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(suppress-keymap dig-mode-map)
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(define-key dig-mode-map "q" 'dig-exit))
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(defun dig-mode ()
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"Major mode for displaying dig output."
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(interactive)
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(kill-all-local-variables)
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(setq mode-name "dig")
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(setq major-mode 'dig-mode)
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(use-local-map dig-mode-map)
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(buffer-disable-undo)
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(unless (featurep 'xemacs)
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(set (make-local-variable 'font-lock-defaults)
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'(dig-font-lock-keywords t)))
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(when (featurep 'font-lock)
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(font-lock-set-defaults))
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2007-12-01 20:46:06 +00:00
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(save-current-buffer
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(if (fboundp 'run-mode-hooks)
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(run-mode-hooks 'dig-mode-hook)
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(run-hooks 'dig-mode-hook))))
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2007-12-01 20:40:44 +00:00
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(defun dig-exit ()
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"Quit dig output buffer."
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(interactive)
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(kill-buffer (current-buffer)))
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(defun dig (domain &optional
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query-type query-class query-option dig-option server)
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"Query addresses of a DOMAIN using dig, by calling `dig-invoke'.
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Optional arguments are passed to `dig-invoke'."
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(interactive "sHost: ")
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(switch-to-buffer
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(dig-invoke domain query-type query-class query-option dig-option server))
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(goto-char (point-min))
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(and (search-forward ";; ANSWER SECTION:" nil t)
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(forward-line))
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(dig-mode)
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(setq buffer-read-only t)
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(set-buffer-modified-p nil))
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;; named for consistency with query-dns in dns.el
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(defun query-dig (domain &optional
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query-type query-class query-option dig-option server)
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"Query addresses of a DOMAIN using dig.
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It works by calling `dig-invoke' and `dig-extract-rr'. Optional
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arguments are passed to `dig-invoke' and `dig-extract-rr'. Returns
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nil for domain/class/type queries that results in no data."
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(let ((buffer (dig-invoke domain query-type query-class
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query-option dig-option server)))
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(when buffer
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(switch-to-buffer buffer)
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(let ((digger (dig-extract-rr domain query-type query-class)))
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(kill-buffer buffer)
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digger))))
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(provide 'dig)
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2008-04-10 14:10:46 +00:00
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;; arch-tag: 1d61726e-9400-4013-9ae7-4035e0c7f7d6
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2007-12-01 20:40:44 +00:00
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;;; dig.el ends here
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