Use UDP for DNS queries to avoid diald problems.

svn path=/trunk/; revision=1511

diff --git a/fetchmail.c b/fetchmail.c
index 66c4331abe1243af116779dd042da9a8e33f4ab3..369e1fd4fd8e9086868230677fede8e2a416a386 100644 (file)
--- a/fetchmail.c
+++ b/fetchmail.c
@@ -369,7 +369,17 @@ int main (int argc, char **argv)
      * reflect the status of that transaction.
      */
     do {
-#ifdef HAVE_RES_SEARCH
+#if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
+       /*
+        * This was an efficiency hack that backfired.  The theory
+        * was that using TCP/IP for DNS queries would get us better
+        * reliability and shave off some per-UDP-packet costs.
+        * Unfortunately it interacted badly with diald, which effectively 
+        * filters out DNS queries over TCP/IP for reasons having to do
+        * with some obscure kernel problem involving bootstrapping of
+        * dynamically-addressed links.  I don't understand this mess
+        * and don't want to, so it's "See ya!" to this hack.
+        */
        sethostent(TRUE);       /* use TCP/IP for mailserver queries */
 #endif /* HAVE_RES_SEARCH */
 
@@ -457,7 +467,7 @@ int main (int argc, char **argv)
            }
        }
 
-#ifdef HAVE_RES_SEARCH
+#if defined(HAVE_RES_SEARCH) && defined(USE_TCPIP_FOR_DNS)
        endhostent();           /* release TCP/IP connection to nameserver */
 #endif /* HAVE_RES_SEARCH */