Allow the mesh to detect when a node has completely restarted.

[meshlink] / src / protocol_edge.c

diff --git a/src/protocol_edge.c b/src/protocol_edge.c
index 4efb1eceb0bdfbac7723d0050620055253f2b4ff..6be658ee56fda5eee86901c99280bf9bab6d2295 100644 (file)
--- a/src/protocol_edge.c
+++ b/src/protocol_edge.c
@@ -74,9 +74,9 @@ bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, in
                s = e->to->submesh;
        }
 
-       x = send_request(mesh, c, s, "%d %x %s %d %s %s %s %s %d %s %x %d %d", ADD_EDGE, rand(),
+       x = send_request(mesh, c, s, "%d %x %s %d %s %s %s %s %d %s %x %d %d %x", ADD_EDGE, prng(mesh, UINT_MAX),
                         e->from->name, e->from->devclass, from_submesh, e->to->name, address, port,
-                        e->to->devclass, to_submesh, OPTION_PMTU_DISCOVERY, e->weight, contradictions);
+                        e->to->devclass, to_submesh, OPTION_PMTU_DISCOVERY, e->weight, contradictions, e->from->session_id);
        free(address);
        free(port);
 
@@ -84,6 +84,9 @@ bool send_add_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, in
 }
 
 bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
+       assert(request);
+       assert(*request);
+
        edge_t *e;
        node_t *from, *to;
        char from_name[MAX_STRING_SIZE];
@@ -97,23 +100,24 @@ bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
        sockaddr_t address;
        int weight;
        int contradictions = 0;
+       uint32_t session_id = 0;
        submesh_t *s = NULL;
 
-       if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %d "MAX_STRING" %*x %d %d",
+       if(sscanf(request, "%*d %*x "MAX_STRING" %d "MAX_STRING" "MAX_STRING" "MAX_STRING" "MAX_STRING" %d "MAX_STRING" %*x %d %d %x",
                        from_name, &from_devclass, from_submesh_name, to_name, to_address, to_port, &to_devclass, to_submesh_name,
-                       &weight, &contradictions) < 9) {
+                       &weight, &contradictions, &session_id) < 9) {
                logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "ADD_EDGE", c->name);
                return false;
        }
 
        // Check if devclasses are valid
 
-       if(from_devclass < 0 || from_devclass > _DEV_CLASS_MAX) {
+       if(from_devclass < 0 || from_devclass >= DEV_CLASS_COUNT) {
                logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "from devclass invalid");
                return false;
        }
 
-       if(to_devclass < 0 || to_devclass > _DEV_CLASS_MAX) {
+       if(to_devclass < 0 || to_devclass >= DEV_CLASS_COUNT) {
                logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ADD_EDGE", c->name, "to devclass invalid");
                return false;
        }
@@ -161,6 +165,10 @@ bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
 
        from->devclass = from_devclass;
 
+       if(!from->session_id) {
+               from->session_id = session_id;
+       }
+
        if(!to) {
                to = new_node();
                to->status.dirty = true;
@@ -191,7 +199,7 @@ bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
        e = lookup_edge(from, to);
 
        if(e) {
-               if(e->weight != weight || sockaddrcmp(&e->address, &address)) {
+               if(e->weight != weight || e->session_id != session_id || sockaddrcmp(&e->address, &address)) {
                        if(from == mesh->self) {
                                logger(mesh, MESHLINK_WARNING, "Got %s from %s for ourself which does not match existing entry",
                                       "ADD_EDGE", c->name);
@@ -212,6 +220,7 @@ bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
                e = new_edge();
                e->from = from;
                e->to = to;
+               e->session_id = session_id;
                send_del_edge(mesh, c, e, mesh->contradicting_add_edge);
                free_edge(e);
                return true;
@@ -222,6 +231,7 @@ bool add_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
        e->to = to;
        e->address = address;
        e->weight = weight;
+       e->session_id = session_id;
        edge_add(mesh, e);
 
        /* Run MST before or after we tell the rest? */
@@ -270,19 +280,23 @@ bool send_del_edge(meshlink_handle_t *mesh, connection_t *c, const edge_t *e, in
                s = e->to->submesh;
        }
 
-       return send_request(mesh, c, s, "%d %x %s %s %d", DEL_EDGE, rand(),
-                           e->from->name, e->to->name, contradictions);
+       return send_request(mesh, c, s, "%d %x %s %s %d %x", DEL_EDGE, prng(mesh, UINT_MAX),
+                           e->from->name, e->to->name, contradictions, e->session_id);
 }
 
 bool del_edge_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
+       assert(request);
+       assert(*request);
+
        edge_t *e;
        char from_name[MAX_STRING_SIZE];
        char to_name[MAX_STRING_SIZE];
        node_t *from, *to;
        int contradictions = 0;
+       uint32_t session_id = 0;
        submesh_t *s = NULL;
 
-       if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" %d", from_name, to_name, &contradictions) < 2) {
+       if(sscanf(request, "%*d %*x "MAX_STRING" "MAX_STRING" %d %x", from_name, to_name, &contradictions, &session_id) < 2) {
                logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "DEL_EDGE", c->name);
                return false;
        }