core: add X-Sequence header supportv1.2.2

Add non-standard HTTP header "X-Sequence" to the header section of
requests (og_send_request) sent to a connected client.

Define a starting sequence number when creating a new instance of struct
og_client inside og_server_accept_cb. This sequence number is
incremented by one for each outgoing request from ogServer.

This sequence number is checked when receiving a response from a
connected client, if they do not match the connection is dropped.

Use sequence 0 for out-of-band commands (reboot, poweroff, stop). Any
client response with header "X-Sequence: 0" bypasses sequence check.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/rest.h b/src/rest.h
index df6b225..d146868 100644
--- a/src/rest.h
+++ b/src/rest.h
@@ -68,6 +68,7 @@ struct og_client {
 	enum og_cmd_result	last_cmd_result;
 	bool			autorun;
 	uint32_t		speed;
+	uint32_t		seq;
 	const char		*shell_output;
 };