Split -request-update-info into -request-marks and -update-info.

[gnus] / lisp / dns.el

diff --git a/lisp/dns.el b/lisp/dns.el
index 00e48c6..2d4c2d8 100644 (file)
--- a/lisp/dns.el
+++ b/lisp/dns.el
@@ -1,10 +1,10 @@
 ;;; dns.el --- Domain Name Service lookups
 
-;; Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008
+;; Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
 ;;   Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
-;; Keywords: network
+;; Keywords: network comm
 
 ;; This file is part of GNU Emacs.
 
@@ -29,8 +29,8 @@
   "How many seconds to wait when doing DNS queries.")
 
 (defvar dns-servers nil
-  "Which DNS servers to query.
-If nil, /etc/resolv.conf will be consulted.")
+  "List of DNS servers to query.
+If nil, /etc/resolv.conf and nslookup will be consulted.")
 
 ;;; Internal code:
 
@@ -101,7 +101,7 @@ If nil, /etc/resolv.conf will be consulted.")
 
 (defun dns-read-string-name (string buffer)
   (with-temp-buffer
-    (set-buffer-multibyte nil)
+    (unless (featurep 'xemacs) (set-buffer-multibyte nil))
     (insert string)
     (goto-char (point-min))
     (dns-read-name buffer)))
@@ -135,7 +135,7 @@ If nil, /etc/resolv.conf will be consulted.")
   "Write a DNS packet according to SPEC.
 If TCP-P, the first two bytes of the package with be the length field."
   (with-temp-buffer
-    (set-buffer-multibyte nil)
+    (unless (featurep 'xemacs) (set-buffer-multibyte nil))
     (dns-write-bytes (dns-get 'id spec) 2)
     (dns-write-bytes
      (logior
@@ -151,7 +151,7 @@ If TCP-P, the first two bytes of the package with be the length field."
       (lsh (if (dns-get 'truncated-p spec) 1 0) -1)
       (lsh (if (dns-get 'recursion-desired-p spec) 1 0) 0)))
     (dns-write-bytes
-     (cond 
+     (cond
       ((eq (dns-get 'response-code spec) 'no-error) 0)
       ((eq (dns-get 'response-code spec) 'format-error) 1)
       ((eq (dns-get 'response-code spec) 'server-failure) 2)
@@ -186,7 +186,7 @@ If TCP-P, the first two bytes of the package with be the length field."
 
 (defun dns-read (packet)
   (with-temp-buffer
-    (set-buffer-multibyte nil)
+    (unless (featurep 'xemacs) (set-buffer-multibyte nil))
     (let ((spec nil)
           queries answers authorities additionals)
       (insert packet)
@@ -263,7 +263,7 @@ If TCP-P, the first two bytes of the package with be the length field."
        (point (point)))
     (prog1
         (with-temp-buffer
-          (set-buffer-multibyte nil)
+         (unless (featurep 'xemacs) (set-buffer-multibyte nil))
           (insert string)
           (goto-char (point-min))
           (cond
@@ -298,14 +298,24 @@ If TCP-P, the first two bytes of the package with be the length field."
            (t string)))
       (goto-char point))))
 
-(defun dns-parse-resolv-conf ()
-  (when (file-exists-p "/etc/resolv.conf")
-    (with-temp-buffer
-      (insert-file-contents "/etc/resolv.conf")
-      (goto-char (point-min))
-      (while (re-search-forward "^nameserver[\t ]+\\([^ \t\n]+\\)" nil t)
-       (push (match-string 1) dns-servers))
-      (setq dns-servers (nreverse dns-servers)))))
+(defun dns-set-servers ()
+  "Set `dns-servers' to a list of DNS servers or nil if none are found.
+Parses \"/etc/resolv.conf\" or calls \"nslookup\"."
+  (or (when (file-exists-p "/etc/resolv.conf")
+       (setq dns-servers nil)
+       (with-temp-buffer
+         (insert-file-contents "/etc/resolv.conf")
+         (goto-char (point-min))
+         (while (re-search-forward "^nameserver[\t ]+\\([^ \t\n]+\\)" nil t)
+           (push (match-string 1) dns-servers))
+         (setq dns-servers (nreverse dns-servers))))
+      (when (executable-find "nslookup")
+       (with-temp-buffer
+         (call-process "nslookup" nil t nil "localhost")
+         (goto-char (point-min))
+         (re-search-forward
+          "^Address:[ \t]*\\([0-9]+\\.[0-9]+\\.[0-9]+\\.[0-9]+\\)" nil t)
+         (setq dns-servers (list (match-string 1)))))))
 
 (defun dns-read-txt (string)
   (if (> (length string) 1)
@@ -351,23 +361,26 @@ If TCP-P, the first two bytes of the package with be the length field."
 
 (defvar dns-cache (make-vector 4096 0))
 
-(defun query-dns-cached (name &optional type fullp reversep)
+(defun dns-query-cached (name &optional type fullp reversep)
   (let* ((key (format "%s:%s:%s:%s" name type fullp reversep))
         (sym (intern-soft key dns-cache)))
     (if (and sym
             (boundp sym))
        (symbol-value sym)
-      (let ((result (query-dns name type fullp reversep)))
+      (let ((result (dns-query name type fullp reversep)))
        (set (intern key dns-cache) result)
        result))))
 
-(defun query-dns (name &optional type fullp reversep)
+;; The old names `query-dns' and `query-dns-cached' weren't used in Emacs 23
+;; yet, so no alias are provided.  --rsteib
+
+(defun dns-query (name &optional type fullp reversep)
   "Query a DNS server for NAME of TYPE.
 If FULLP, return the entire record returned.
 If REVERSEP, look up an IP address."
   (setq type (or type 'A))
   (unless dns-servers
-    (dns-parse-resolv-conf))
+    (dns-set-servers))
 
   (when reversep
     (setq name (concat
@@ -378,7 +391,7 @@ If REVERSEP, look up an IP address."
   (if (not dns-servers)
       (message "No DNS server configuration found")
     (with-temp-buffer
-      (set-buffer-multibyte nil)
+      (unless (featurep 'xemacs) (set-buffer-multibyte nil))
       (let ((process (condition-case ()
                          (dns-make-network-process (car dns-servers))
                        (error
@@ -425,5 +438,4 @@ If REVERSEP, look up an IP address."
 
 (provide 'dns)
 
-;; arch-tag: d0edd0c4-4cce-4538-ae92-06c3356ee80a
 ;;; dns.el ends here