Kludge for tcp-wrappers problem during system catastrophes.

[users/heiko/exim.git] / doc / doc-txt / ChangeLog

diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog
index d69e9eafbfa1111338dd2cb432c1c5ecd205721a..56d0822fd6d85d883ad7d45241a16087611c84b8 100644 (file)
--- a/doc/doc-txt/ChangeLog
+++ b/doc/doc-txt/ChangeLog
@@ -1,4 +1,4 @@
-$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.340 2006/04/18 11:13:19 ph10 Exp $
+$Cambridge: exim/doc/doc-txt/ChangeLog,v 1.341 2006/04/19 10:58:21 ph10 Exp $
 
 Change log file for Exim from version 4.21
 -------------------------------------------
@@ -12,6 +12,16 @@ TF/01 Fix the add_header change below (4.61 PH/55) which had a bug that (amongst
 PH/01 ${readsocket now supports Internet domain sockets (modified John Jetmore
       patch).
 
+PH/02 When tcp-wrappers is called from Exim, it returns only "deny" or "allow".
+      "Deny" causes Exim to reject the incoming connection with a 554 error.
+      Unfortunately, if there is a major crisis, such as a disk failure,
+      tcp-wrappers gives "deny", whereas what one would like would be some
+      kind of temporary error. A kludge has been added to help with this.
+      Before calling hosts_ctl(), errno is set zero. If the result is "deny", a
+      554 error is used if errno is still zero or contains ENOENT (which occurs
+      if either of the /etc/hosts.{allow,deny} files is missing). Otherwise, a
+      451 error is used.
+
 
 Exim version 4.61
 -----------------