From: Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
Date: Fri, 30 Oct 2020 14:01:30 +0000 (+0100)
Subject: mingw: Hack for missing /dev/urandom.
X-Git-Url: https://jxself.org/git/?a=commitdiff_plain;h=c45e4b2baeb7500002ad8a7c77ef76f86851d321;p=8sync.git

mingw: Hack for missing /dev/urandom.

* 8sync/systems/websocket/client.scm (open-entropy-port): Add hack for
missing /dev/urandom.
---

diff --git a/8sync/systems/websocket/client.scm b/8sync/systems/websocket/client.scm
index 107aea9..4ae342d 100644
--- 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."