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1 | ;;; dig.el --- Domain Name System dig interface |
2 | ||
ba318903 | 3 | ;; Copyright (C) 2000-2014 Free Software Foundation, Inc. |
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4 | |
5 | ;; Author: Simon Josefsson <simon@josefsson.org> | |
7589d38e | 6 | ;; Keywords: DNS BIND dig comm |
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7 | |
8 | ;; This file is part of GNU Emacs. | |
9 | ||
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10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation, either version 3 of the License, or | |
13 | ;; (at your option) any later version. | |
4c1d5922 | 14 | |
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15 | ;; GNU Emacs is distributed in the hope that it will be useful, |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
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19 | |
20 | ;; You should have received a copy of the GNU General Public License | |
874a927a | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
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22 | |
23 | ;;; Commentary: | |
24 | ||
25 | ;; This provide an interface for "dig". | |
26 | ;; | |
27 | ;; For interactive use, try M-x dig and type a hostname. Use `q' to quit | |
28 | ;; dig buffer. | |
29 | ;; | |
30 | ;; For use in elisp programs, call `dig-invoke' and use | |
31 | ;; `dig-extract-rr' to extract resource records. | |
32 | ||
33 | ;;; Release history: | |
34 | ||
35 | ;; 2000-10-28 posted on gnu.emacs.sources | |
36 | ||
37 | ;;; Code: | |
38 | ||
39 | (eval-when-compile (require 'cl)) | |
40 | ||
41 | (defgroup dig nil | |
42 | "Dig configuration." | |
43 | :group 'comm) | |
44 | ||
45 | (defcustom dig-program "dig" | |
46 | "Name of dig (domain information groper) binary." | |
47 | :type 'file | |
48 | :group 'dig) | |
49 | ||
50 | (defcustom dig-dns-server nil | |
51 | "DNS server to query. | |
52 | If nil, use system defaults." | |
53 | :type '(choice (const :tag "System defaults") | |
54 | string) | |
55 | :group 'dig) | |
56 | ||
57 | (defcustom dig-font-lock-keywords | |
58 | '(("^;; [A-Z]+ SECTION:" 0 font-lock-keyword-face) | |
59 | ("^;;.*" 0 font-lock-comment-face) | |
60 | ("^; <<>>.*" 0 font-lock-type-face) | |
61 | ("^;.*" 0 font-lock-function-name-face)) | |
62 | "Default expressions to highlight in dig mode." | |
63 | :type 'sexp | |
64 | :group 'dig) | |
65 | ||
66 | (defun dig-invoke (domain &optional | |
67 | query-type query-class query-option | |
68 | dig-option server) | |
69 | "Call dig with given arguments and return buffer containing output. | |
5a0c3f56 JB |
70 | DOMAIN is a string with a DNS domain. QUERY-TYPE is an optional |
71 | string with a DNS type. QUERY-CLASS is an optional string with a DNS | |
72 | class. QUERY-OPTION is an optional string with dig \"query options\". | |
73 | DIG-OPTION is an optional string with parameters for the dig program. | |
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74 | SERVER is an optional string with a domain name server to query. |
75 | ||
76 | Dig is an external program found in the BIND name server distribution, | |
77 | and is a commonly available debugging tool." | |
78 | (let (buf cmdline) | |
79 | (setq buf (generate-new-buffer "*dig output*")) | |
80 | (if dig-option (push dig-option cmdline)) | |
81 | (if query-option (push query-option cmdline)) | |
82 | (if query-class (push query-class cmdline)) | |
83 | (if query-type (push query-type cmdline)) | |
84 | (push domain cmdline) | |
85 | (if server (push (concat "@" server) cmdline) | |
86 | (if dig-dns-server (push (concat "@" dig-dns-server) cmdline))) | |
87 | (apply 'call-process dig-program nil buf nil cmdline) | |
88 | buf)) | |
89 | ||
90 | (defun dig-extract-rr (domain &optional type class) | |
91 | "Extract resource records for DOMAIN, TYPE and CLASS from buffer. | |
92 | Buffer should contain output generated by `dig-invoke'." | |
93 | (save-excursion | |
94 | (goto-char (point-min)) | |
95 | (if (re-search-forward | |
96 | (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+" | |
97 | (upcase (or class "IN")) "[\t ]+" (upcase (or type "A"))) | |
98 | nil t) | |
99 | (let (b e) | |
100 | (end-of-line) | |
101 | (setq e (point)) | |
102 | (beginning-of-line) | |
103 | (setq b (point)) | |
104 | (when (search-forward " (" e t) | |
105 | (search-forward " )")) | |
106 | (end-of-line) | |
107 | (setq e (point)) | |
108 | (buffer-substring b e)) | |
109 | (and (re-search-forward (concat domain "\\.?[\t ]+[0-9wWdDhHmMsS]+[\t ]+" | |
110 | (upcase (or class "IN")) | |
111 | "[\t ]+CNAME[\t ]+\\(.*\\)$") nil t) | |
112 | (dig-extract-rr (match-string 1) type class))))) | |
113 | ||
114 | (defun dig-rr-get-pkix-cert (rr) | |
115 | (let (b e str) | |
116 | (string-match "[^\t ]+[\t ]+[0-9wWdDhHmMsS]+[\t ]+IN[\t ]+CERT[\t ]+\\(1\\|PKIX\\)[\t ]+[0-9]+[\t ]+[0-9]+[\t ]+(?" rr) | |
117 | (setq b (match-end 0)) | |
118 | (string-match ")" rr) | |
119 | (setq e (match-beginning 0)) | |
120 | (setq str (substring rr b e)) | |
121 | (while (string-match "[\t \n\r]" str) | |
122 | (setq str (replace-match "" nil nil str))) | |
123 | str)) | |
124 | ||
125 | ;; XEmacs does it like this. For Emacs, we have to set the | |
126 | ;; `font-lock-defaults' buffer-local variable. | |
127 | (put 'dig-mode 'font-lock-defaults '(dig-font-lock-keywords t)) | |
128 | ||
129 | (put 'dig-mode 'mode-class 'special) | |
130 | ||
a0310a6c DN |
131 | (defvar dig-mode-map |
132 | (let ((map (make-sparse-keymap))) | |
133 | (suppress-keymap map) | |
134 | (define-key map "q" 'dig-exit) | |
135 | map)) | |
4c1d5922 | 136 | |
5ac42715 | 137 | (define-derived-mode dig-mode nil "Dig" |
4c1d5922 | 138 | "Major mode for displaying dig output." |
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139 | (buffer-disable-undo) |
140 | (unless (featurep 'xemacs) | |
141 | (set (make-local-variable 'font-lock-defaults) | |
142 | '(dig-font-lock-keywords t))) | |
143 | (when (featurep 'font-lock) | |
5ac42715 | 144 | ;; FIXME: what is this for?? --Stef |
4c1d5922 | 145 | (font-lock-set-defaults)) |
5ac42715 | 146 | ) |
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147 | |
148 | (defun dig-exit () | |
149 | "Quit dig output buffer." | |
150 | (interactive) | |
151 | (kill-buffer (current-buffer))) | |
152 | ||
d54cc599 | 153 | ;;;###autoload |
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154 | (defun dig (domain &optional |
155 | query-type query-class query-option dig-option server) | |
156 | "Query addresses of a DOMAIN using dig, by calling `dig-invoke'. | |
157 | Optional arguments are passed to `dig-invoke'." | |
158 | (interactive "sHost: ") | |
159 | (switch-to-buffer | |
160 | (dig-invoke domain query-type query-class query-option dig-option server)) | |
161 | (goto-char (point-min)) | |
162 | (and (search-forward ";; ANSWER SECTION:" nil t) | |
163 | (forward-line)) | |
164 | (dig-mode) | |
165 | (setq buffer-read-only t) | |
166 | (set-buffer-modified-p nil)) | |
167 | ||
168 | ;; named for consistency with query-dns in dns.el | |
169 | (defun query-dig (domain &optional | |
170 | query-type query-class query-option dig-option server) | |
171 | "Query addresses of a DOMAIN using dig. | |
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172 | It works by calling `dig-invoke' and `dig-extract-rr'. |
173 | Optional arguments are passed to `dig-invoke' and `dig-extract-rr'. | |
174 | Returns nil for domain/class/type queries that result in no data." | |
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175 | (let ((buffer (dig-invoke domain query-type query-class |
176 | query-option dig-option server))) | |
177 | (when buffer | |
178 | (switch-to-buffer buffer) | |
179 | (let ((digger (dig-extract-rr domain query-type query-class))) | |
180 | (kill-buffer buffer) | |
181 | digger)))) | |
182 | ||
183 | (provide 'dig) | |
184 | ||
4c1d5922 | 185 | ;;; dig.el ends here |