From ef9a2962dfc603aee52be9066d77522d47b3ece7 Mon Sep 17 00:00:00 2001
From: Datong Sun <dndx@idndx.com>
Date: Thu, 16 Sep 2021 21:35:34 -0700
Subject: [PATCH] bugfix(fake_tcp) do not RST packets that already have RST on
 them

---
 src/fake_tcp/mod.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/fake_tcp/mod.rs b/src/fake_tcp/mod.rs
index 8b2f049..bf4201e 100644
--- a/src/fake_tcp/mod.rs
+++ b/src/fake_tcp/mod.rs
@@ -394,6 +394,7 @@ impl Stack {
                             assert!(shared.tuples.lock().unwrap().insert(tuple, Arc::new(incoming)).is_none());
                             tokio::spawn(sock.accept());
                         } else {
+                            info!("Bad TCP SYN packet from {}, sending RST", remote_addr);
                             let buf = build_tcp_packet(
                                 local_addr,
                                 remote_addr,
@@ -404,7 +405,8 @@ impl Stack {
                             );
                             shared.outgoing.try_send(buf).unwrap();
                         }
-                    } else {
+                    } else if (tcp_packet.get_flags() & tcp::TcpFlags::RST) == 0 {
+                        info!("Bad TCP packet from {}, sending RST", remote_addr);
                         let buf = build_tcp_packet(
                             local_addr,
                             remote_addr,