Initial version

Working ping back and forth with specified data, and data
arrives at the other party.

Currently, the server uses nflog to get the pings, which:
1. requires iptables settings to work;
2. buffers and collects messages for a second.
Both are suboptimal, and I believe raw sockets can improve
on this.

1 files changed, 6 insertions, 0 deletions

diff --git a/util.h b/util.h
new file mode 100644
index 0000000..ea48028
--- /dev/null
+++ b/util.h
@@ -0,0 +1,6 @@
+#pragma once
+
+#include <stdlib.h>
+
+
+void xxd(const void *buf, size_t length);