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1 | ;;; dig.el --- Domain Name System dig interface |
2 | ||
3 | ;; Copyright (C) 2000, 2001, 2002, 2003, 2004, | |
e3fe4da0 | 4 | ;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
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5 | |
6 | ;; Author: Simon Josefsson <simon@josefsson.org> | |
7 | ;; Keywords: DNS BIND dig | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
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11 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation, either version 3 of the License, or | |
14 | ;; (at your option) any later version. | |
4c1d5922 | 15 | |
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16 | ;; GNU Emacs is distributed in the hope that it will be useful, |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
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20 | |
21 | ;; You should have received a copy of the GNU General Public License | |
874a927a | 22 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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23 | |
24 | ;;; Commentary: | |
25 | ||
26 | ;; This provide an interface for "dig". | |
27 | ;; | |
28 | ;; For interactive use, try M-x dig and type a hostname. Use `q' to quit | |
29 | ;; dig buffer. | |
30 | ;; | |
31 | ;; For use in elisp programs, call `dig-invoke' and use | |
32 | ;; `dig-extract-rr' to extract resource records. | |
33 | ||
34 | ;;; Release history: | |
35 | ||
36 | ;; 2000-10-28 posted on gnu.emacs.sources | |
37 | ||
38 | ;;; Code: | |
39 | ||
40 | (eval-when-compile (require 'cl)) | |
41 | ||
42 | (defgroup dig nil | |
43 | "Dig configuration." | |
44 | :group 'comm) | |
45 | ||
46 | (defcustom dig-program "dig" | |
47 | "Name of dig (domain information groper) binary." | |
48 | :type 'file | |
49 | :group 'dig) | |
50 | ||
51 | (defcustom dig-dns-server nil | |
52 | "DNS server to query. | |
53 | If nil, use system defaults." | |
54 | :type '(choice (const :tag "System defaults") | |
55 | string) | |
56 | :group 'dig) | |
57 | ||
58 | (defcustom dig-font-lock-keywords | |
59 | '(("^;; [A-Z]+ SECTION:" 0 font-lock-keyword-face) | |
60 | ("^;;.*" 0 font-lock-comment-face) | |
61 | ("^; <<>>.*" 0 font-lock-type-face) | |
62 | ("^;.*" 0 font-lock-function-name-face)) | |
63 | "Default expressions to highlight in dig mode." | |
64 | :type 'sexp | |
65 | :group 'dig) | |
66 | ||
67 | (defun dig-invoke (domain &optional | |
68 | query-type query-class query-option | |
69 | dig-option server) | |
70 | "Call dig with given arguments and return buffer containing output. | |
71 | DOMAIN is a string with a DNS domain. QUERY-TYPE is an optional string | |
72 | with a DNS type. QUERY-CLASS is an optional string with a DNS class. | |
73 | QUERY-OPTION is an optional string with dig \"query options\". | |
74 | DIG-OPTIONS is an optional string with parameters for the dig program. | |
75 | SERVER is an optional string with a domain name server to query. | |
76 | ||
77 | Dig is an external program found in the BIND name server distribution, | |
78 | and is a commonly available debugging tool." | |
79 | (let (buf cmdline) | |
80 | (setq buf (generate-new-buffer "*dig output*")) | |
81 | (if dig-option (push dig-option cmdline)) | |
82 | (if query-option (push query-option cmdline)) | |
83 | (if query-class (push query-class cmdline)) | |
84 | (if query-type (push query-type cmdline)) | |
85 | (push domain cmdline) | |
86 | (if server (push (concat "@" server) cmdline) | |
87 | (if dig-dns-server (push (concat "@" dig-dns-server) cmdline))) | |
88 | (apply 'call-process dig-program nil buf nil cmdline) | |
89 | buf)) | |
90 | ||
91 | (defun dig-extract-rr (domain &optional type class) | |
92 | "Extract resource records for DOMAIN, TYPE and CLASS from buffer. | |
93 | Buffer should contain output generated by `dig-invoke'." | |
94 | (save-excursion | |
95 | (goto-char (point-min)) | |
96 | (if (re-search-forward | |
97 | (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+" | |
98 | (upcase (or class "IN")) "[\t ]+" (upcase (or type "A"))) | |
99 | nil t) | |
100 | (let (b e) | |
101 | (end-of-line) | |
102 | (setq e (point)) | |
103 | (beginning-of-line) | |
104 | (setq b (point)) | |
105 | (when (search-forward " (" e t) | |
106 | (search-forward " )")) | |
107 | (end-of-line) | |
108 | (setq e (point)) | |
109 | (buffer-substring b e)) | |
110 | (and (re-search-forward (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+" | |
111 | (upcase (or class "IN")) | |
112 | "[\t ]+CNAME[\t ]+\\(.*\\)$") nil t) | |
113 | (dig-extract-rr (match-string 1) type class))))) | |
114 | ||
115 | (defun dig-rr-get-pkix-cert (rr) | |
116 | (let (b e str) | |
117 | (string-match "[^\t ]+[\t ]+[0-9wWdDhHmMsS]+[\t ]+IN[\t ]+CERT[\t ]+\\(1\\|PKIX\\)[\t ]+[0-9]+[\t ]+[0-9]+[\t ]+(?" rr) | |
118 | (setq b (match-end 0)) | |
119 | (string-match ")" rr) | |
120 | (setq e (match-beginning 0)) | |
121 | (setq str (substring rr b e)) | |
122 | (while (string-match "[\t \n\r]" str) | |
123 | (setq str (replace-match "" nil nil str))) | |
124 | str)) | |
125 | ||
126 | ;; XEmacs does it like this. For Emacs, we have to set the | |
127 | ;; `font-lock-defaults' buffer-local variable. | |
128 | (put 'dig-mode 'font-lock-defaults '(dig-font-lock-keywords t)) | |
129 | ||
130 | (put 'dig-mode 'mode-class 'special) | |
131 | ||
132 | (defvar dig-mode-map nil) | |
133 | (unless dig-mode-map | |
134 | (setq dig-mode-map (make-sparse-keymap)) | |
135 | (suppress-keymap dig-mode-map) | |
136 | ||
137 | (define-key dig-mode-map "q" 'dig-exit)) | |
138 | ||
139 | (defun dig-mode () | |
140 | "Major mode for displaying dig output." | |
141 | (interactive) | |
142 | (kill-all-local-variables) | |
143 | (setq mode-name "dig") | |
144 | (setq major-mode 'dig-mode) | |
145 | (use-local-map dig-mode-map) | |
146 | (buffer-disable-undo) | |
147 | (unless (featurep 'xemacs) | |
148 | (set (make-local-variable 'font-lock-defaults) | |
149 | '(dig-font-lock-keywords t))) | |
150 | (when (featurep 'font-lock) | |
151 | (font-lock-set-defaults)) | |
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152 | (save-current-buffer |
153 | (if (fboundp 'run-mode-hooks) | |
154 | (run-mode-hooks 'dig-mode-hook) | |
155 | (run-hooks 'dig-mode-hook)))) | |
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156 | |
157 | (defun dig-exit () | |
158 | "Quit dig output buffer." | |
159 | (interactive) | |
160 | (kill-buffer (current-buffer))) | |
161 | ||
162 | (defun dig (domain &optional | |
163 | query-type query-class query-option dig-option server) | |
164 | "Query addresses of a DOMAIN using dig, by calling `dig-invoke'. | |
165 | Optional arguments are passed to `dig-invoke'." | |
166 | (interactive "sHost: ") | |
167 | (switch-to-buffer | |
168 | (dig-invoke domain query-type query-class query-option dig-option server)) | |
169 | (goto-char (point-min)) | |
170 | (and (search-forward ";; ANSWER SECTION:" nil t) | |
171 | (forward-line)) | |
172 | (dig-mode) | |
173 | (setq buffer-read-only t) | |
174 | (set-buffer-modified-p nil)) | |
175 | ||
176 | ;; named for consistency with query-dns in dns.el | |
177 | (defun query-dig (domain &optional | |
178 | query-type query-class query-option dig-option server) | |
179 | "Query addresses of a DOMAIN using dig. | |
180 | It works by calling `dig-invoke' and `dig-extract-rr'. Optional | |
181 | arguments are passed to `dig-invoke' and `dig-extract-rr'. Returns | |
182 | nil for domain/class/type queries that results in no data." | |
183 | (let ((buffer (dig-invoke domain query-type query-class | |
184 | query-option dig-option server))) | |
185 | (when buffer | |
186 | (switch-to-buffer buffer) | |
187 | (let ((digger (dig-extract-rr domain query-type query-class))) | |
188 | (kill-buffer buffer) | |
189 | digger)))) | |
190 | ||
191 | (provide 'dig) | |
192 | ||
cbee283d | 193 | ;; arch-tag: 1d61726e-9400-4013-9ae7-4035e0c7f7d6 |
4c1d5922 | 194 | ;;; dig.el ends here |