+ 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;
+ 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(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;
+
+ if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1 || !(len = b64decode(buf, buf, strlen(buf)))) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "REQ_SPTPS_START", from->name, "invalid SPTPS data");
+ return true;
+ }
+
+ char label[sizeof(meshlink_udp_label) + strlen(from->name) + strlen(mesh->self->name) + 2];
+ snprintf(label, sizeof(label), "%s %s %s", meshlink_udp_label, from->name, mesh->self->name);
+ sptps_stop(&from->sptps);
+ from->status.validkey = false;
+ from->status.waitingforkey = true;
+ from->last_req_key = mesh->loop.now.tv_sec;
+ sptps_start(&from->sptps, from, false, true, mesh->private_key, from->ecdsa, label, sizeof(label) - 1, send_sptps_data, receive_sptps_record);
+ sptps_receive_data(&from->sptps, buf, len);
+ return true;
+ }
+
+ case REQ_SPTPS: {
+ if(!from->status.validkey) {
+ logger(mesh, MESHLINK_ERROR, "Got REQ_SPTPS from %s but we don't have a valid key yet", from->name);
+ return true;
+ }
+
+ char buf[MAX_STRING_SIZE];
+ int len;
+
+ if(sscanf(request, "%*d %*s %*s %*d " MAX_STRING, buf) != 1 || !(len = b64decode(buf, buf, strlen(buf)))) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "REQ_SPTPS", from->name, "invalid SPTPS data");
+ return true;
+ }
+
+ sptps_receive_data(&from->sptps, buf, len);
+ return true;
+ }
+
+ default:
+ logger(mesh, MESHLINK_ERROR, "Unknown extended REQ_KEY request from %s: %s", from->name, request);
+ return true;
+ }
+}
+
+bool req_key_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
+ char from_name[MAX_STRING_SIZE];
+ char to_name[MAX_STRING_SIZE];
+ node_t *from, *to;
+ int reqno = 0;
+
+ if(sscanf(request, "%*d " MAX_STRING " " MAX_STRING " %d", from_name, to_name, &reqno) < 2) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s", "REQ_KEY", c->name);
+ return false;
+ }
+
+ if(!check_id(from_name) || !check_id(to_name)) {
+ logger(mesh, MESHLINK_ERROR, "Got bad %s from %s: %s", "REQ_KEY", c->name, "invalid name");
+ return false;
+ }
+
+ from = lookup_node(mesh, from_name);
+
+ if(!from) {
+ logger(mesh, MESHLINK_ERROR, "Got %s from %s origin %s which does not exist in our connection list",
+ "REQ_KEY", c->name, from_name);
+ return true;
+ }
+
+ to = lookup_node(mesh, to_name);
+
+ if(!to) {
+ logger(mesh, MESHLINK_ERROR, "Got %s from %s destination %s which does not exist in our connection list",
+ "REQ_KEY", c->name, to_name);
+ return true;
+ }
+
+ /* Check if this key request is for us */
+
+ if(to == mesh->self) { /* Yes */
+ /* Is this an extended REQ_KEY message? */
+ if(reqno) {
+ return req_key_ext_h(mesh, c, request, from, reqno);
+ }
+
+ /* This should never happen. Ignore it, unless it came directly from the connected peer, in which case we disconnect. */
+ return from->connection != c;
+ } else {
+ if(!to->status.reachable) {
+ logger(mesh, MESHLINK_WARNING, "Got %s from %s destination %s which is not reachable",
+ "REQ_KEY", c->name, to_name);
+ return true;
+ }
+
+ send_request(mesh, to->nexthop->connection, NULL, "%s", request);
+ }
+
+ return true;