resolved: when we get a TCP connection failure, try again

Previously, when we couldn't connect to a DNS server via TCP we'd abort the whole transaction using a "connection-failure" state. This change removes that, and counts failed connections as "lost packet" events, so that we switch back to the UDP protocol again.
2016-01-11 19:39:59 +01:00
parent 6a1a5eec43
commit a1a3f73a57
4 changed files with 11 additions and 8 deletions
@@ -73,3 +73,6 @@ int same_fd(int a, int b);
 void cmsg_close_all(struct msghdr *mh);

 bool fdname_is_valid(const char *s);
+
+#define ERRNO_IS_DISCONNECT(r) \
+        IN_SET(r, ENOTCONN, ECONNRESET, ECONNREFUSED, ECONNABORTED, EPIPE)