linux.c: Detect hall-of-mirrors effect in `nf_conntrack'.

[yaid] / linux.c

diff --git a/linux.c b/linux.c
index 8ed0396e40192bd21b15608136fe3c12e56999d1..ec4fe4e7f0ae5eb5fdc0e0283031c89276d2ff70 100644 (file)
--- a/linux.c
+++ b/linux.c
@@ -434,6 +434,13 @@ void identify(struct query *q)
          !sockeq(q->ao, &s[i^1], &q->s[R]))
        continue;
 
+      /* As a trap for the unwary, this file contains unhelpful entries which
+       * just mirror the source/destination addresses.  If this is one of
+       * those, we'll be stuck in a cycle talking to ourselves.
+       */
+      if (sockeq(q->ao, &s[i], &s[i^3]))
+       continue;
+
       /* We win.  The remaining address must be the client host.  We should
        * proxy this query.
        */