mingw: Hack for missing /dev/urandom.

[8sync.git] / 8sync / systems / websocket / client.scm

diff --git a/8sync/systems/websocket/client.scm b/8sync/systems/websocket/client.scm
index 107aea96e0283ae673839cd333a58b2ade388f5b..4ae342d9c919f776b8ff3498ffff23999e79458b 100644 (file)
--- a/8sync/systems/websocket/client.scm
+++ b/8sync/systems/websocket/client.scm
@@ -308,9 +308,14 @@ KEY."
 (define (open-entropy-port)
   "Return an open input port to a reliable source of entropy for the
 current system."
-  ;; XXX: This works on GNU/Linux and OS X systems, but this isn't
-  ;; exactly portable.
-  (open-input-file "/dev/urandom"))
+  (if (file-exists? "/dev/urandom")
+      (open-input-file "/dev/urandom")
+      ;; XXX: This works as a fall back but this isn't exactly a
+      ;; reliable source of entropy.
+      (make-soft-port (vector (const #f) (const #f) (const #f)
+                              (lambda _ (let ((r (random 256))) (integer->char r)))
+                              (const #f)
+                              (const #t)) "r")))
 
 (define-method (websocket-close (websocket <websocket>))
   "Close the WebSocket connection for the client WEBSOCKET."