void broker_subscribe_remote(DownstreamNode *respNode, SubRequester *subreq,
const char *respPath) {
DownstreamNode *reqNode = subreq->reqNode;
ref_t *ref = dslink_map_get(&respNode->resp_sub_streams, (void*)respPath);
BrokerSubStream *bss;
if (ref) {
bss = ref->data;
} else {
bss = broker_stream_sub_init();
bss->respSid = broker_node_incr_sid(respNode);
bss->remote_path = dslink_strdup(respPath);
bss->respNode = (BrokerNode*)respNode;
// a invalid qos value, so the newQos != qos,
// which will send a new subscribe method to responder
bss->respQos = 0xFF;
dslink_map_set(&respNode->resp_sub_streams, dslink_str_ref(bss->remote_path), dslink_ref(bss, NULL));
dslink_map_set(&respNode->resp_sub_sids, dslink_int_ref(bss->respSid), dslink_ref(bss, NULL));
}
subreq->stream = bss;
dslink_map_set(&bss->reqSubs, dslink_ref(reqNode, NULL), dslink_ref(subreq, NULL));
broker_update_stream_qos(bss);
if (bss->last_value) {
broker_update_sub_req(subreq, bss->last_value);
}
}
static
uint8_t set_virtual_permission(const char* path, VirtualDownstreamNode* node, json_t *json) {
if (!path || *path == 0) {
List *permissions = permission_list_load(json);
permission_list_free(node->permissionList);
node->permissionList = permissions;
return 0;
} else {
const char* next = strstr(path, "/");
char* name;
if (next) {
name = dslink_calloc(next - path + 1, 1);
memcpy(name, path, next-path);
next ++; // remove '/'
} else {
name = (char*)path;
}
ref_t *ref = dslink_map_get(&node->childrenNode, name);
VirtualDownstreamNode *child;
if (ref && ref->data) {
child = ref->data;
} else {
child = dslink_calloc(1, sizeof(VirtualDownstreamNode));
virtual_downstream_node_init(child);
dslink_map_set(&node->childrenNode, dslink_str_ref(name), dslink_ref(child, NULL));
}
return set_virtual_permission(next, child, json);
}
}
void broker_subscribe_local_nonexistent(const char *path, SubRequester *subreq) {
Broker *broker = mainLoop->data;
ref_t *ref = dslink_map_get(&broker->local_pending_sub, (char *) path);
List *subs;
if (ref) {
subs = ref->data;
} else {
subs = dslink_calloc(1, sizeof(List));
list_init(subs);
dslink_map_set(&broker->local_pending_sub,
dslink_str_ref(path),
dslink_ref(subs, subs_list_free));
}
subreq->pendingNode = dslink_list_insert(subs, subreq);
}
void broker_add_new_subscription(Broker *broker, SubRequester *subreq) {
char *out = NULL;
DownstreamNode * reqNode = subreq->reqNode;
BrokerNode *respNode = broker_node_get(broker->root, subreq->path, &out);
dslink_map_set(&reqNode->req_sub_paths, dslink_str_ref(subreq->path), dslink_ref(subreq, NULL));
dslink_map_set(&reqNode->req_sub_sids, dslink_int_ref(subreq->reqSid), dslink_ref(subreq, NULL));
if (!respNode) {
if (dslink_str_starts_with(subreq->path, "/downstream/") || dslink_str_starts_with(subreq->path, "/upstream/")) {
broker_subscribe_disconnected_remote(subreq->path, subreq);
} else {
broker_subscribe_local_nonexistent(subreq->path, subreq);
}
return;
}
if (respNode->type == REGULAR_NODE) {
broker_handle_local_subscribe( respNode, subreq);
} else {
DownstreamNode *downNode = (DownstreamNode *)respNode;
broker_subscribe_remote(downNode, subreq, out);
}
}
json_t *broker_handshake_handle_conn(Broker *broker,
const char *dsId,
const char *token,
json_t *handshake) {
if (dslink_map_contains(&broker->client_connecting, (void *) dsId)) {
ref_t *ref = dslink_map_remove_get(&broker->client_connecting,
(void *) dsId);
RemoteDSLink *link = ref->data;
dslink_map_remove(&broker->client_connecting,
(void *) link->name);
broker_remote_dslink_free(link);
dslink_free(link);
dslink_decref(ref);
}
RemoteDSLink *link = dslink_calloc(1, sizeof(RemoteDSLink));
json_t *resp = json_object();
if (!(link && resp)) {
goto fail;
}
if (broker_remote_dslink_init(link) != 0) {
goto fail;
}
link->broker = broker;
link->auth = dslink_calloc(1, sizeof(RemoteAuth));
if (!link->auth) {
goto fail;
}
if (dslink_handshake_generate_key_pair(&link->auth->tempKey) != 0) {
log_err("Failed to create temporary key for DSLink\n");
goto fail;
}
{
json_t *jsonPubKey = json_object_get(handshake, "publicKey");
if (!jsonPubKey) {
goto fail;
}
const char *tmp = json_string_value(jsonPubKey);
if (!tmp) {
goto fail;
}
tmp = dslink_strdup(tmp);
if (!tmp) {
goto fail;
}
link->auth->pubKey = tmp;
}
char tempKey[90];
size_t tempKeyLen = 0;
if (dslink_handshake_encode_pub_key(&link->auth->tempKey, tempKey,
sizeof(tempKey), &tempKeyLen) != 0) {
goto fail;
}
if (generate_salt((unsigned char *) link->auth->salt,
sizeof(link->auth->salt)) != 0) {
goto fail;
}
json_object_set_new_nocheck(resp, "wsUri", json_string_nocheck("/ws"));
json_object_set_new_nocheck(resp, "tempKey", json_string_nocheck(tempKey));
json_object_set_new_nocheck(resp, "salt", json_string_nocheck(link->auth->salt));
if (json_boolean_value(json_object_get(handshake, "isResponder"))) {
link->isResponder = 1;
}
if (json_boolean_value(json_object_get(handshake, "isRequester"))) {
link->isRequester = 1;
}
json_t *linkData = json_object_get(handshake, "linkData");
if (json_is_object(linkData)) {
json_incref(linkData);
link->linkData = linkData;
}
{
char buf[512] = {0};
snprintf(buf, sizeof(buf), "/downstream/");
char *name = buf + sizeof("/downstream/")-1;
size_t dsIdLen = strlen(dsId);
if (dsIdLen < 44) {
goto fail;
}
size_t nameLen = dsIdLen - 43;
if (dsId[nameLen - 1] == '-') {
nameLen--;
}
int nodeExists = 0;
// find a valid name from broker->client_names
memcpy(name, dsId, nameLen);
while (1) {
ref_t *ref = dslink_map_get(&broker->client_connecting, name);
if (ref) {
RemoteDSLink *l = ref->data;
if (l && l->dsId && strcmp(l->dsId->data, dsId) == 0) {
dslink_map_remove(&broker->client_connecting, name);
broker_remote_dslink_free(l);
break;
} else {
name[nameLen] = dsId[nameLen];
nameLen++;
}
}
ref = dslink_map_get(broker->downstream->children,
(void *) name);
if (ref == NULL) {
break;
}
if (!((DownstreamNode *) ref->data)->dsId || strcmp(dsId, ((DownstreamNode *) ref->data)->dsId->data) == 0) {
nodeExists = 1;
break;
}
name[nameLen] = dsId[nameLen];
nameLen++;
}
if (!nodeExists && broker_enable_token) {
if (!token) {
log_err("Failed to connet, need token\n");
goto fail;
}
BrokerNode* tokenNode = get_token_node(token, dsId);
if (tokenNode) {
DownstreamNode *node = broker_init_downstream_node(broker->downstream, name);
if (json_is_true(json_object_get(node->meta, "$$managed"))) {
json_object_set_new_nocheck(node->meta, "$$token", json_string_nocheck(tokenNode->name));
}
node->dsId = dslink_str_ref(dsId);
if (broker->downstream->list_stream) {
update_list_child(broker->downstream,
broker->downstream->list_stream,
link->name);
}
json_t *group = json_object_get(tokenNode->meta, "$$group");
if (json_is_string(group)) {
json_object_set_nocheck(node->meta, "$$group", group);
}
token_used(tokenNode);
broker_downstream_nodes_changed(broker);
} else {
log_err("Invalid token: %s\n", token);
goto fail;
}
}
json_object_set_new_nocheck(resp, "path", json_string_nocheck(buf));
link->path = dslink_strdup(buf);
if (!link->path) {
goto fail;
}
link->name = link->path + sizeof("/downstream/") - 1;
// add to connecting map with the name
if (dslink_map_set(&broker->client_connecting,
dslink_ref((void *) link->name, NULL),
dslink_ref(link, NULL)) != 0) {
dslink_free((void *) link->path);
goto fail;
}
}
{
ref_t *tmp = dslink_ref(dslink_strdup(dsId), dslink_free);
if (!tmp) {
goto fail;
}
// add to connecting map with dsId
if (dslink_map_set(&broker->client_connecting, tmp,
dslink_ref(link, NULL)) != 0) {
dslink_free(tmp);
goto fail;
}
}
return resp;
fail:
if (link) {
broker_remote_dslink_free(link);
dslink_free((void *) link->path);
dslink_free(link);
}
DSLINK_CHECKED_EXEC(json_decref, resp);
return NULL;
}
