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; }