X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fsrc%2Fdns.c;h=542354db394e0c41a28583c5831450661a9ee52e;hb=ac6652c8a0ac69fc0f46d7f8535aa537cd609c94;hp=3d047abba11cbbbbe62ff8d60962b81b9830cfe1;hpb=0f06b4f296802e4e13188c740ea09419931a3020;p=user%2Fhenk%2Fcode%2Fexim.git

diff --git a/src/src/dns.c b/src/src/dns.c
index 3d047abba..542354db3 100644
--- a/src/src/dns.c
+++ b/src/src/dns.c
@@ -455,6 +455,14 @@ return h->ad ? TRUE : FALSE;
 #endif
 }
 
+static void
+dns_set_insecure(dns_answer * dnsa)
+{
+HEADER * h = (HEADER *)dnsa->answer;
+h->ad = 0;
+}
+
+
 
 
 
@@ -752,7 +760,8 @@ int
 dns_lookup(dns_answer *dnsa, uschar *name, int type, uschar **fully_qualified_name)
 {
 int i;
-uschar *orig_name = name;
+const uschar *orig_name = name;
+BOOL secure_so_far = TRUE;
 
 /* Loop to follow CNAME chains so far, but no further... */
 
@@ -807,7 +816,12 @@ for (i = 0; i < 10; i++)
 
   /* If any data records of the correct type were found, we are done. */
 
-  if (type_rr.data != NULL) return DNS_SUCCEED;
+  if (type_rr.data != NULL)
+    {
+    if (!secure_so_far)	/* mark insecure if any element of CNAME chain was */
+      dns_set_insecure(dnsa);
+    return DNS_SUCCEED;
+    }
 
   /* If there are no data records, we need to re-scan the DNS using the
   domain given in the CNAME record, which should exist (otherwise we should
@@ -820,6 +834,9 @@ for (i = 0; i < 10; i++)
   if (datalen < 0) return DNS_FAIL;
   name = data;
 
+  if (!dns_is_secure(dnsa))
+    secure_so_far = FALSE;
+
   DEBUG(D_dns) debug_printf("CNAME found: change to %s\n", name);
   }       /* Loop back to do another lookup */