+/* REQ_KEY is overloaded to allow arbitrary requests to be routed between two nodes. */
+
+static bool req_key_ext_h(meshlink_handle_t *mesh, connection_t *c, const char *request, node_t *from, int reqno) {
+ (void)c;
+
+ if(!from->nexthop || !from->nexthop->connection) {
+ logger(mesh, MESHLINK_WARNING, "Cannot answer REQ_KEY from %s via %s", from->name, from->nexthop ? from->nexthop->name : from->name);
+ return true;
+ }
+
+ switch(reqno) {
+ case REQ_PUBKEY: {
+ char *pubkey = ecdsa_get_base64_public_key(mesh->private_key);
+
+ if(!node_read_public_key(mesh, from)) {
+ char hiskey[MAX_STRING_SIZE];
+
+ if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, hiskey) == 1) {
+ from->ecdsa = ecdsa_set_base64_public_key(hiskey);
+
+ if(!from->ecdsa) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "REQ_PUBKEY", from->name, "invalid pubkey");
+ return true;
+ }
+
+ logger(mesh, MESHLINK_INFO, "Learned ECDSA public key from %s", from->name);
+ from->status.dirty = true;
+
+ if(!node_write_config(mesh, from, true)) {
+ // ignore
+ }
+ }
+ }
+
+ send_request(mesh, from->nexthop->connection, NULL, "%d %s %s %d %s", REQ_KEY, mesh->self->name, from->name, ANS_PUBKEY, pubkey);
+ free(pubkey);
+ return true;
+ }
+
+ case ANS_PUBKEY: {
+ if(node_read_public_key(mesh, from)) {
+ logger(mesh, MESHLINK_WARNING, "Got ANS_PUBKEY from %s even though we already have his pubkey", from->name);
+ return true;
+ }
+
+ char pubkey[MAX_STRING_SIZE];
+
+ if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, pubkey) != 1 || !(from->ecdsa = ecdsa_set_base64_public_key(pubkey))) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "ANS_PUBKEY", from->name, "invalid pubkey");
+ return true;
+ }
+
+ logger(mesh, MESHLINK_INFO, "Learned ECDSA public key from %s", from->name);
+ from->status.dirty = true;
+
+ if(!node_write_config(mesh, from, true)) {
+ // ignore
+ }
+
+ /* If we are trying to form an outgoing connection to this node, retry immediately */
+ for list_each(outgoing_t, outgoing, mesh->outgoings) {
+ if(outgoing->node == from && outgoing->ev.cb) {
+ outgoing->timeout = 0;
+ timeout_set(&mesh->loop, &outgoing->ev, &(struct timespec) {
+ 0, 0
+ });
+ }
+ }
+
+ /* Also reset any UTCP timers */
+ utcp_reset_timers(from->utcp);
+
+ return true;
+ }
+
+ case REQ_KEY: {
+ if(!node_read_public_key(mesh, from)) {
+ logger(mesh, MESHLINK_DEBUG, "No ECDSA key known for %s", from->name);
+ send_request(mesh, from->nexthop->connection, NULL, "%d %s %s %d", REQ_KEY, mesh->self->name, from->name, REQ_PUBKEY);
+ return true;
+ }
+
+ if(from->sptps.label) {
+ logger(mesh, MESHLINK_DEBUG, "Got REQ_KEY from %s while we already started a SPTPS session!", from->name);
+
+ if(mesh->loop.now.tv_sec < from->last_req_key + req_key_timeout && strcmp(mesh->self->name, from->name) < 0) {
+ logger(mesh, MESHLINK_DEBUG, "Ignoring REQ_KEY from %s.", from->name);
+ return true;
+ }
+ }
+
+ char buf[MAX_STRING_SIZE];
+ int len;