(mm-codepage-setup): New helper function.

[gnus] / lisp / dns.el

diff --git a/lisp/dns.el b/lisp/dns.el
index 0bab5d6..fdb4ca4 100644 (file)
--- a/lisp/dns.el
+++ b/lisp/dns.el
@@ -1,5 +1,6 @@
 ;;; dns.el --- Domain Name Service lookups
-;; Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
+
+;; Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
 
 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
 ;; Keywords: network
@@ -18,8 +19,8 @@
 
 ;; 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.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Commentary:
 
@@ -348,13 +349,32 @@ If TCP-P, the first two bytes of the package with be the length field."
         ;; connection to the DNS server.
         (open-network-stream "dns" (current-buffer) server "domain")))))
 
-(defun query-dns (name &optional type fullp)
+(defvar dns-cache (make-vector 4096 0))
+
+(defun query-dns-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)))
+       (set (intern key dns-cache) result)
+       result))))
+
+(defun query-dns (name &optional type fullp reversep)
   "Query a DNS server for NAME of TYPE.
-If FULLP, return the entire record returned."
+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))
 
+  (when reversep
+    (setq name (concat
+               (mapconcat 'identity (nreverse (split-string name "\\.")) ".")
+               ".in-addr.arpa")
+         type 'PTR))
+
   (if (not dns-servers)
       (message "No DNS server configuration found")
     (mm-with-unibyte-buffer
@@ -379,6 +399,7 @@ If FULLP, return the entire record returned."
                      tcp-p))
          (while (and (zerop (buffer-size))
                      (> times 0))
+           (sit-for (/ step 1000.0))
            (accept-process-output process 0 step)
            (decf times step))
          (ignore-errors