Riccardo Murri <riccardo.murri at gmail.com>

Require rx when compiling.
(tls-end-of-info): New variable.
(open-tls-stream): Keep reading input until `tls-end-of-info' is matched.

lisp/ChangeLog

+2007-11-04  Riccardo Murri  <riccardo.murri@gmail.com>
+
+	* net/tls.el: Require rx when compiling.
+	(tls-end-of-info): New variable.
+	(open-tls-stream): Keep reading input until `tls-end-of-info' is
+	matched.
+
 2007-11-03  Ulrich Mueller  <ulm@gentoo.org>  (tiny change)
 
 	* simple.el (bad-packages-alist): Anchor semantic regexp.

lisp/net/tls.el

@@ -51,10 +51,45 @@
   (autoload 'format-spec "format-spec")
   (autoload 'format-spec-make "format-spec"))
 
+(eval-when-compile
+  (require 'rx))
+
 (defgroup tls nil
   "Transport Layer Security (TLS) parameters."
   :group 'comm)
 
+(defcustom tls-end-of-info
+  (rx
+   (or
+    ;; `openssl s_client` regexp
+    (sequence
+     ;; see ssl/ssl_txt.c lines 219--220
+     line-start
+     "    Verify return code: "
+     (one-or-more not-newline)
+     "\n"
+     ;; according to apps/s_client.c line 1515 this is always the last
+     ;; line that is printed by s_client before the real data
+     "---\n")
+    ;; `gnutls` regexp
+    (sequence
+     ;; see src/cli.c lines 721--
+     (sequence line-start "- Simple Client Mode:\n")
+     (zero-or-more
+      (or
+       "\n"                             ; ignore blank lines
+       ;; XXX: we have no way of knowing if the STARTTLS handshake
+       ;; sequence has completed successfully, because `gnutls` will
+       ;; only report failure.
+       (sequence line-start "\*\*\* Starting TLS handshake\n"))))))
+  "Regexp matching end of TLS client informational messages.
+Client data stream begins after the last character matched by
+this.  The default matches `openssl s_client' (version 0.9.8c)
+and `gnutls-cli' (version 2.0.1) output."
+  :version "22.2"
+  :type 'regexp
+  :group 'tls)
+
 (defcustom tls-program '("gnutls-cli -p %p %h"
 			 "gnutls-cli -p %p %h --protocols ssl3"
 			 "openssl s_client -connect %h:%p -no_ssl2")
@@ -130,6 +165,8 @@ Fourth arg PORT is an integer specifying a port to connect to."
 	process	cmd done)
     (if use-temp-buffer
 	(setq buffer (generate-new-buffer " TLS")))
+    (save-excursion
+      (set-buffer buffer)
       (message "Opening TLS connection to `%s'..." host)
     (while (and (not done) (setq cmd (pop cmds)))
       (message "Opening TLS connection with `%s'..." cmd)
@@ -146,19 +183,34 @@ Fourth arg PORT is an integer specifying a port to connect to."
 			      port)))))
 	(while (and process
 		    (memq (process-status process) '(open run))
-		    (save-excursion
-		      (set-buffer buffer) ;; XXX "blue moon" nntp.el bug
+		    (progn
 		      (goto-char (point-min))
 		      (not (setq done (re-search-forward tls-success nil t)))))
 	  (unless (accept-process-output process 1)
 	    (sit-for 1)))
 	(message "Opening TLS connection with `%s'...%s" cmd
 		 (if done "done" "failed"))
-	(if done
-	    (setq done process)
-	  (delete-process process))))
+	(if (not done)
+	    (delete-process process)
+	  ;; advance point to after all informational messages that
+	  ;; `openssl s_client' and `gnutls' print
+	  (let ((start-of-data nil))
+	    (while
+		(not (setq start-of-data
+			   ;; the string matching `tls-end-of-info'
+			   ;; might come in separate chunks from
+			   ;; `accept-process-output', so start the
+			   ;; search where `tls-success' ended
+			   (save-excursion
+			     (if (re-search-forward tls-end-of-info nil t)
+				 (match-end 0)))))
+	      (accept-process-output process 1))
+	    (if start-of-data
+		;; move point to start of client data
+		(goto-char start-of-data)))
+	  (setq done process))))
     (message "Opening TLS connection to `%s'...%s"
-	     host (if done "done" "failed"))
+	     host (if done "done" "failed")))
     (when use-temp-buffer
       (if done (set-process-buffer process nil))
       (kill-buffer buffer))