Add fallback to numeric only nameinfo

1 files changed, 15 insertions, 3 deletions

diff --git a/waitress/server.py b/waitress/server.py
index d3fbd79..79aa9b7 100644
--- a/waitress/server.py
+++ b/waitress/server.py
@@ -294,9 +294,21 @@ class TcpWSGIServer(BaseWSGIServer):
         self.bind(sockaddr)
 
     def getsockname(self):
-        return self.socketmod.getnameinfo(
-            self.socket.getsockname(),
-            self.socketmod.NI_NUMERICSERV)
+        try:
+            return self.socketmod.getnameinfo(
+                self.socket.getsockname(),
+                self.socketmod.NI_NUMERICSERV
+            )
+        except: # pragma: no cover
+            # This only happens on Linux because a DNS issue is considered a
+            # temporary failure that will raise (even when NI_NAMEREQD is not
+            # set). Instead we try again, but this time we just ask for the
+            # numerichost and the numericserv (port) and return those. It is
+            # better than nothing.
+            return self.socketmod.getnameinfo(
+                self.socket.getsockname(),
+                self.socketmod.NI_NUMERICHOST | self.socketmod.NI_NUMERICSERV
+            )
 
     def set_socket_options(self, conn):
         for (level, optname, value) in self.adj.socket_options: