DSNode *dslink_node_create(DSNode *parent,
const char *name, const char *profile) {
name = dslink_strdup(name);
if (!name) {
return NULL;
}
profile = dslink_strdup(profile);
if (!profile) {
free((void *) name);
return NULL;
}
DSNode *node = calloc(1, sizeof(DSNode));
if (!node) {
goto cleanup;
}
node->parent = parent;
node->name = name;
node->profile = profile;
if (parent) {
size_t pathLen = strlen(parent->path);
size_t nameLen = strlen(name);
char *path = malloc(pathLen + nameLen + 2);
node->path = path;
if (!path) {
goto cleanup;
}
memcpy(path, parent->path, pathLen);
*(path + pathLen) = '/';
memcpy(path + pathLen + 1, name, nameLen + 1);
} else {
node->path = calloc(1, sizeof(char));
if (!node->path) {
goto cleanup;
}
}
return node;
cleanup:
DSLINK_CHECKED_EXEC(free, (void *) name);
DSLINK_CHECKED_EXEC(free, (void *) profile);
if (node) {
DSLINK_CHECKED_EXEC(free, (void *) node->path);
free(node);
}
return NULL;
}
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);
}
}
List *permission_list_load(json_t *json) {
if (!json_is_array(json) || json_array_size(json) == 0) {
return NULL;
}
List *rslt = dslink_calloc(1, sizeof(List));
list_init(rslt);
size_t idx;
json_t *value;
json_array_foreach(json, idx, value) {
if (json_array_size(value) == 2) {
json_t *v0 = json_array_get(value, 0);
json_t *v1 = json_array_get(value, 1);
if (json_is_string(v0) && json_is_string(v1)) {
const char* vc0 = json_string_value(v0);
const char* vc1 = json_string_value(v1);
PermissionLevel p = permission_str_level(vc1);
if (p <= PERMISSION_CONFIG) {
PermissionPair * pair = dslink_malloc(sizeof(PermissionPair));
pair->group = dslink_strdup(vc0);
pair->permission = p;
dslink_list_insert(rslt, pair);
}
}
}
}
return rslt;
}
void permission_groups_load(PermissionGroups* groups, const char *dsId, const char* str) {
if (groups->groups) {
permission_groups_free(groups);
}
size_t allocatedLen = 1;
size_t len = 0;
if (str) {
allocatedLen = 4;
groups->groups = dslink_malloc(sizeof(char*) * allocatedLen);
const char *start = str;
const char *end = str - 1;
do {
++end;
if (*end == ',' || *end == '\0') {
if (end > start) {
// +1 for current value, +1 for the dsId
if (len + 2 > allocatedLen) {
allocatedLen *= 2;
groups->groups = dslink_realloc(groups->groups, sizeof(char*) * allocatedLen);
}
groups->groups[len] = dslink_strdupl(start, end - start);
++len;
}
start = end + 1;
}
}while (*end);
} else {
groups->groups = dslink_malloc(sizeof(char*));
}
// dsId as a permission group
groups->groups[len] = dslink_strdup(dsId);
++len;
groups->groupLen = len;
}
static
char *dslink_str_replace_all_rep(const char *haystack,
const char *needle,
const size_t needleLen,
const char *replacement,
const size_t replacementLen,
const int shouldDup) {
char *start = strstr(haystack, needle);
if (!start) {
if (shouldDup) {
return dslink_strdup(haystack);
} else {
return (char *) haystack;
}
}
const size_t haystackLen = strlen(haystack);
char *dup = dslink_malloc(haystackLen - needleLen + replacementLen + 1);
if (!dup) {
return NULL;
}
size_t len = start - haystack;
memcpy(dup, haystack, len);
memcpy(dup + len, replacement, replacementLen);
len += replacementLen;
size_t remainder = (haystack + haystackLen) - (start + needleLen);
memcpy(dup + len, start + needleLen, remainder);
dup[haystackLen - needleLen + replacementLen] = '\0';
if (!shouldDup) {
dslink_free((char *) haystack);
}
return dslink_str_replace_all_rep(dup, needle, needleLen,
replacement, replacementLen, 0);
}
static
int broker_init(Broker *broker, json_t *defaultPermission) {
broker->root = broker_node_create("", "node");
if (!broker->root) {
goto fail;
}
broker->root->permissionList = permission_list_load(defaultPermission);
broker->root->path = dslink_strdup("/");
json_object_set_new(broker->root->meta, "$downstream",
json_string_nocheck("/downstream"));
broker->sys = broker_node_create("sys", "static");
if (!(broker->sys && broker_node_add(broker->root, broker->sys) == 0)) {
broker_node_free(broker->sys);
goto fail;
}
broker->upstream = broker_node_create("upstream", "static");
if (!(broker->upstream && broker_node_add(broker->root, broker->upstream) == 0)) {
broker_node_free(broker->upstream);
goto fail;
}
broker->data = broker_node_create("data", "node");
if (!(broker->data && broker_node_add(broker->root, broker->data) == 0
&& broker_load_data_nodes(broker) == 0
&& broker_data_node_populate(broker->data) == 0)) {
broker_node_free(broker->data);
goto fail;
}
broker->downstream = broker_node_create("downstream", "node");
if (!(broker->downstream
&& broker_node_add(broker->root, broker->downstream) == 0)) {
broker_node_free(broker->downstream);
goto fail;
}
broker_load_downstream_nodes(broker);
broker_load_qos_storage(broker);
if (broker_sys_node_populate(broker->sys)) {
goto fail;
}
BrokerNode *node = broker_node_create("defs", "static");
if (!(node && json_object_set_new_nocheck(node->meta,
"$hidden",
json_true()) == 0
&& broker_node_add(broker->root, node) == 0)) {
broker_node_free(node);
goto fail;
}
if (dslink_map_init(&broker->client_connecting, dslink_map_str_cmp,
dslink_map_str_key_len_cal, dslink_map_hash_key) != 0) {
goto fail;
}
if (dslink_map_init(&broker->remote_pending_sub, dslink_map_str_cmp,
dslink_map_str_key_len_cal, dslink_map_hash_key) != 0) {
goto fail;
}
if (dslink_map_init(&broker->local_pending_sub, dslink_map_str_cmp,
dslink_map_str_key_len_cal, dslink_map_hash_key) != 0) {
goto fail;
}
return 0;
fail:
broker_free(broker);
return 1;
}
int dslink_request_handle(DSLink *link, json_t *req) {
const char *method = json_string_value(json_object_get(req, "method"));
if (!method) {
return 1;
}
if (strcmp(method, "list") == 0) {
const char *path = json_string_value(json_object_get(req, "path"));
DSNode *node = dslink_node_get_path(link->responder->super_root, path);
return dslink_response_list(link, req, node);
} else if (strcmp(method, "subscribe") == 0) {
json_t *paths = json_object_get(req, "paths");
json_t *rid = json_object_get(req, "rid");
return dslink_response_sub(link, paths, rid);
} else if (strcmp(method, "unsubscribe") == 0) {
json_t *sids = json_object_get(req, "sids");
json_t *rid = json_object_get(req, "rid");
return dslink_response_unsub(link, sids, rid);
} else if (strcmp(method, "invoke") == 0) {
const char *path = json_string_value(json_object_get(req, "path"));
DSNode *node = dslink_node_get_path(link->responder->super_root, path);
if (node && node->on_invocation) {
Stream *stream = dslink_malloc(sizeof(Stream));
if (!stream) {
return 1;
}
stream->type = INVOCATION_STREAM;
stream->path = dslink_strdup(node->path);
ref_t *stream_ref = dslink_ref(stream, free_stream);
json_t *jsonRid = json_object_get(req, "rid");
json_t *params = json_object_get(req, "params");
node->on_invocation(link, node, jsonRid, params, stream_ref);
if (stream->unused != 1) {
dslink_decref(stream_ref);
} else {
ref_t *rid = dslink_ref(dslink_malloc(sizeof(uint32_t)), dslink_free);
{
uint32_t r = (uint32_t) json_integer_value(jsonRid);
*((uint32_t *) rid->data) = r;
}
if (dslink_map_set(link->responder->open_streams,
rid,
stream_ref) != 0) {
dslink_free(rid);
dslink_free(stream_ref);
free_stream(stream);
return 1;
}
}
}
} else if (strcmp(method, "set") == 0) {
const char *path = json_string_value(json_object_get(req, "path"));
json_t *value = json_object_get(req, "value");
DSNode *node = dslink_node_get_path(link->responder->super_root, path);
if (node) {
ref_t *writable_ref = dslink_map_get(node->meta_data, "$writable");
if (writable_ref && json_is_string((json_t*) writable_ref->data)) {
if (node->on_value_set) {
node->on_value_set(link, node, value);
} else {
dslink_node_update_value(link, node, value);
}
}
}
} else if (strcmp(method, "close") == 0) {
json_t *rid = json_object_get(req, "rid");
uint32_t ridi = (uint32_t) json_integer_value(rid);
ref_t *stream_ref = dslink_map_remove_get(link->responder->open_streams, &ridi);
if (stream_ref) {
Stream *stream = stream_ref->data;
DSNode *node = NULL;
if (stream->path) {
node = dslink_node_get_path(link->responder->super_root, stream->path);
}
if (stream->on_close != NULL) {
stream->on_close(link, node, stream);
}
if (stream->type == LIST_STREAM) {
dslink_map_remove(link->responder->list_subs, (void *) stream->path);
}
dslink_decref(stream_ref);
}
} else {
log_warn("Unrecognized method: %s\n", method);
}
return 0;
}
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;
}
int broker_handshake_handle_ws(Broker *broker,
Client *client,
const char *dsId,
const char *auth,
const char *wsAccept) {
ref_t *oldDsId = NULL;
ref_t *ref = dslink_map_remove_get(&broker->client_connecting,
(char *) dsId);
if (!ref) {
return 1;
}
RemoteDSLink *link = ref->data;
dslink_decref(ref);
if (link->name) {
dslink_map_remove(&broker->client_connecting,
(char *) link->name);
}
if (!(auth && link->auth->pubKey)) {
return 1;
}
uv_timer_t *ping_timer = NULL;
int ret = 0;
{ // Perform auth check
char expectedAuth[90];
if (dslink_handshake_gen_auth_key(&link->auth->tempKey,
link->auth->pubKey,
link->auth->salt,
(unsigned char *) expectedAuth,
sizeof(expectedAuth)) != 0) {
ret = 1;
goto exit;
}
if (strcmp(expectedAuth, auth) != 0) {
ret = 1;
goto exit;
}
}
DownstreamNode *node = NULL;
int pendingUpdateList = 0;
{ // Handle retrieval of the downstream node
ref = dslink_map_get(broker->downstream->children,
(char *) link->name);
if (!ref) {
node = broker_init_downstream_node(broker->downstream, link->name);
if (!node) {
ret = 1;
goto exit;
}
oldDsId = dslink_ref(dslink_strdup(dsId), dslink_free);
if (broker->downstream->list_stream) {
pendingUpdateList = 1;
}
broker_downstream_nodes_changed(broker);
} else {
node = ref->data;
oldDsId = node->dsId;
}
}
if (node->link) {
Client *c = node->link->client;
broker_close_link(node->link);
uv_poll_t *poll = c->poll;
dslink_socket_free(c->sock);
dslink_free(c);
uv_close((uv_handle_t *) poll, broker_free_handle);
}
// add permission group to link
json_t *group = json_object_get(node->meta, "$$group");
permission_groups_load(&link->permission_groups, dsId, json_string_value(group));
link->client = client;
link->dsId = oldDsId;
link->node = node;
node->dsId = oldDsId;
client->sock_data = link;
json_object_set_new(node->meta, "$$dsId", json_string_nocheck(dsId));
wslay_event_context_ptr ws;
if (wslay_event_context_server_init(&ws,
broker_ws_callbacks(),
link) != 0) {
ret = 1;
goto exit;
}
link->ws = ws;
broker_ws_send_init(client->sock, wsAccept);
ping_timer = dslink_malloc(sizeof(uv_timer_t));
ping_timer->data = link;
uv_timer_init(link->client->poll->loop, ping_timer);
uv_timer_start(ping_timer, dslink_handle_ping, 1000, 30000);
link->pingTimerHandle = ping_timer;
// set the ->link and update all existing stream
broker_dslink_connect(node, link);
if (pendingUpdateList) {
update_list_child(broker->downstream,
broker->downstream->list_stream,
link->name);
}
log_info("DSLink `%s` has connected\n", dsId);
exit:
mbedtls_ecdh_free(&link->auth->tempKey);
dslink_free((void *) link->auth->pubKey);
dslink_free(link->auth);
link->auth = NULL;
if (ret != 0) {
dslink_map_free(&link->requester_streams);
dslink_map_free(&link->responder_streams);
dslink_free((char *)link->path);
dslink_free(link);
if (ping_timer) {
uv_timer_stop(ping_timer);
uv_close((uv_handle_t *) ping_timer, broker_free_handle);
}
}
return ret;
}
