From eab10b649461c6b6103bcd44615710d7a6a3740d Mon Sep 17 00:00:00 2001
From: Guus Sliepen <guus@meshlink.io>
Date: Mon, 9 Oct 2017 21:47:52 +0200
Subject: [PATCH] Add a devtool function to query the status of a given node.

---
 src/devtools.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 src/devtools.h | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 80 insertions(+)

diff --git a/src/devtools.c b/src/devtools.c
index d4c00f13..a1921d8b 100644
--- a/src/devtools.c
+++ b/src/devtools.c
@@ -237,3 +237,45 @@ done:
 
 	return result;
 }
+
+void devtool_get_node_status(meshlink_handle_t *mesh, meshlink_node_t *node, devtool_node_status_t *status) {
+	if(!mesh || !node || !status) {
+		meshlink_errno = MESHLINK_EINVAL;
+		return;
+	}
+
+	node_t *internal = (node_t *)node;
+
+	pthread_mutex_lock(&mesh->mesh_mutex);
+
+	status->options = internal->options;
+	memcpy(&status->status, &internal->status, sizeof status->status);
+	status->address = internal->address;
+	status->mtu = internal->mtu;
+	status->minmtu = internal->minmtu;
+	status->maxmtu = internal->maxmtu;
+	status->mtuprobes = internal->mtuprobes;
+	status->in_packets = internal->in_packets;
+	status->in_bytes = internal->in_bytes;
+	status->out_packets = internal->out_packets;
+	status->out_bytes = internal->out_bytes;
+
+	// Derive UDP connection status
+	if(internal == mesh->self) {
+		status->udp_status = DEVTOOL_UDP_WORKING;
+	} else if(!internal->status.reachable) {
+		status->udp_status = DEVTOOL_UDP_IMPOSSIBLE;
+	} else if(!internal->status.validkey) {
+		status->udp_status = DEVTOOL_UDP_UNKNOWN;
+	} else if(internal->status.udp_confirmed) {
+		status->udp_status = DEVTOOL_UDP_WORKING;
+	} else if(internal->mtuprobes > 30) {
+		status->udp_status = DEVTOOL_UDP_FAILED;
+	} else if(internal->mtuprobes > 0) {
+		status->udp_status = DEVTOOL_UDP_TRYING;
+	} else {
+		status->udp_status = DEVTOOL_UDP_UNKNOWN;
+	}
+
+	pthread_mutex_unlock(&mesh->mesh_mutex);
+}
diff --git a/src/devtools.h b/src/devtools.h
index 76f9ab53..a9badbc5 100644
--- a/src/devtools.h
+++ b/src/devtools.h
@@ -82,4 +82,42 @@ extern devtool_edge_t *devtool_get_all_edges(meshlink_handle_t *mesh, devtool_ed
  */
 extern bool devtool_export_json_all_edges_state(meshlink_handle_t *mesh, FILE *stream);
 
+/// The status of a node.
+typedef struct devtool_node_status devtool_node_status_t;
+
+/// The status of a node.
+struct devtool_node_status {
+	uint32_t options;
+	uint32_t status;
+	sockaddr_t address;
+	uint16_t mtu;
+	uint16_t minmtu;
+	uint16_t maxmtu;
+	int mtuprobes;
+	enum {
+		DEVTOOL_UDP_FAILED = -2,     /// UDP tried but failed
+		DEVTOOL_UDP_IMPOSSIBLE = -1, /// UDP not possible (node unreachable)
+		DEVTOOL_UDP_UNKNOWN = 0,     /// UDP status not known (never tried to communicate with the node)
+		DEVTOOL_UDP_TRYING,          /// UDP detection in progress
+		DEVTOOL_UDP_WORKING,         /// UDP communication established
+	} udp_status;
+	uint64_t in_packets;
+	uint64_t in_bytes;
+	uint64_t out_packets;
+	uint64_t out_bytes;
+};
+
+/// Get the status of a node.
+/** This function returns a struct containing extra information about a node.
+ *  The information is a snapshot taken at call time.
+ *
+ *  @param mesh         A handle which represents an instance of MeshLink.
+ *  @param node         A pointer to a meshlink_node_t.
+ *  @param status       A pointer to a devtools_node_status_t variable that has
+ *                      to be provided by the caller.
+ *                      The contents of this variable will be changed to reflect
+ *                      the current status of the node.
+ */
+extern void devtool_get_node_status(meshlink_handle_t *mesh, meshlink_node_t *node, devtool_node_status_t *status);
+
 #endif
-- 
2.39.2