+ assert(conn);
+
+ DBG("Relay receiving index");
+
+ if (!session || !conn->version_check_done) {
+ ERR("Trying to close a stream before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ msg_len = lttcomm_relayd_index_len(
+ lttng_to_index_major(conn->major, conn->minor),
+ lttng_to_index_minor(conn->major, conn->minor));
+ if (payload->size < msg_len) {
+ ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
+ msg_len, payload->size);
+ ret = -1;
+ goto end_no_session;
+ }
+ memcpy(&index_info, payload->data, msg_len);
+ index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
+ index_info.net_seq_num = be64toh(index_info.net_seq_num);
+ index_info.packet_size = be64toh(index_info.packet_size);
+ index_info.content_size = be64toh(index_info.content_size);
+ index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
+ index_info.timestamp_end = be64toh(index_info.timestamp_end);
+ index_info.events_discarded = be64toh(index_info.events_discarded);
+ index_info.stream_id = be64toh(index_info.stream_id);
+
+ if (conn->minor >= 8) {
+ index_info.stream_instance_id =
+ be64toh(index_info.stream_instance_id);
+ index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
+ }
+
+ stream = stream_get_by_id(index_info.relay_stream_id);
+ if (!stream) {
+ ERR("stream_get_by_id not found");
+ ret = -1;
+ goto end;
+ }
+ pthread_mutex_lock(&stream->lock);
+
+ /* Live beacon handling */
+ if (index_info.packet_size == 0) {
+ DBG("Received live beacon for stream %" PRIu64,
+ stream->stream_handle);
+
+ /*
+ * Only flag a stream inactive when it has already
+ * received data and no indexes are in flight.
+ */
+ if (stream->index_received_seqcount > 0
+ && stream->indexes_in_flight == 0) {
+ stream->beacon_ts_end = index_info.timestamp_end;
+ }
+ ret = 0;
+ goto end_stream_put;
+ } else {
+ stream->beacon_ts_end = -1ULL;
+ }
+
+ if (stream->ctf_stream_id == -1ULL) {
+ stream->ctf_stream_id = index_info.stream_id;
+ }
+ index = relay_index_get_by_id_or_create(stream, index_info.net_seq_num);
+ if (!index) {
+ ret = -1;
+ ERR("relay_index_get_by_id_or_create index NULL");
+ goto end_stream_put;
+ }
+ if (set_index_control_data(index, &index_info, conn)) {
+ ERR("set_index_control_data error");
+ relay_index_put(index);
+ ret = -1;
+ goto end_stream_put;
+ }
+ ret = relay_index_try_flush(index);
+ if (ret == 0) {
+ tracefile_array_commit_seq(stream->tfa);
+ stream->index_received_seqcount++;
+ stream->pos_after_last_complete_data_index += index->total_size;
+ stream->prev_index_seq = index_info.net_seq_num;
+
+ ret = try_rotate_stream_index(stream);
+ if (ret < 0) {
+ goto end_stream_put;
+ }
+ } else if (ret > 0) {
+ /* no flush. */
+ ret = 0;
+ } else {
+ /*
+ * ret < 0
+ *
+ * relay_index_try_flush is responsible for the self-reference
+ * put of the index object on error.
+ */
+ ERR("relay_index_try_flush error %d", ret);
+ ret = -1;
+ }
+
+end_stream_put:
+ pthread_mutex_unlock(&stream->lock);
+ stream_put(stream);
+
+end:
+
+ memset(&reply, 0, sizeof(reply));
+ if (ret < 0) {
+ reply.ret_code = htobe32(LTTNG_ERR_UNK);
+ } else {
+ reply.ret_code = htobe32(LTTNG_OK);
+ }
+ send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
+ if (send_ret < (ssize_t) sizeof(reply)) {
+ ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
+ ret = -1;
+ }
+
+end_no_session:
+ return ret;
+}
+
+/*
+ * Receive the streams_sent message.
+ *
+ * Return 0 on success else a negative value.
+ */
+static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_connection *conn,
+ const struct lttng_buffer_view *payload)
+{
+ int ret;
+ ssize_t send_ret;
+ struct lttcomm_relayd_generic_reply reply;
+
+ assert(conn);
+
+ DBG("Relay receiving streams_sent");
+
+ if (!conn->session || !conn->version_check_done) {
+ ERR("Trying to close a stream before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ /*
+ * Publish every pending stream in the connection recv list which are
+ * now ready to be used by the viewer.
+ */
+ publish_connection_local_streams(conn);
+
+ memset(&reply, 0, sizeof(reply));
+ reply.ret_code = htobe32(LTTNG_OK);
+ send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
+ if (send_ret < (ssize_t) sizeof(reply)) {
+ ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
+ send_ret);
+ ret = -1;
+ } else {
+ /* Success. */
+ ret = 0;
+ }
+
+end_no_session:
+ return ret;
+}
+
+/*
+ * relay_rotate_session_stream: rotate a stream to a new tracefile for the session
+ * rotation feature (not the tracefile rotation feature).
+ */
+static int relay_rotate_session_stream(const struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_connection *conn,
+ const struct lttng_buffer_view *payload)
+{
+ int ret;
+ ssize_t send_ret;
+ struct relay_session *session = conn->session;
+ struct lttcomm_relayd_rotate_stream stream_info;
+ struct lttcomm_relayd_generic_reply reply;
+ struct relay_stream *stream;
+ size_t header_len;
+ size_t path_len;
+ struct lttng_buffer_view new_path_view;
+
+ if (!session || !conn->version_check_done) {
+ ERR("Trying to rotate a stream before version check");
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ if (session->major == 2 && session->minor < 11) {
+ ERR("Unsupported feature before 2.11");
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ header_len = sizeof(struct lttcomm_relayd_rotate_stream);
+
+ if (payload->size < header_len) {
+ ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
+ header_len, payload->size);
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ memcpy(&stream_info, payload->data, header_len);
+
+ /* Convert to host */
+ stream_info.pathname_length = be32toh(stream_info.pathname_length);
+ stream_info.stream_id = be64toh(stream_info.stream_id);
+ stream_info.new_chunk_id = be64toh(stream_info.new_chunk_id);
+ stream_info.rotate_at_seq_num = be64toh(stream_info.rotate_at_seq_num);
+
+ path_len = stream_info.pathname_length;
+ if (payload->size < header_len + path_len) {
+ ERR("Unexpected payload size in \"relay_rotate_session_stream\" including path: expected >= %zu bytes, got %zu bytes",
+ header_len + path_len, payload->size);
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ /* Ensure it fits in local filename length. */
+ if (path_len >= LTTNG_PATH_MAX) {
+ ret = -ENAMETOOLONG;
+ ERR("Length of relay_rotate_session_stream command's path name (%zu bytes) exceeds the maximal allowed length of %i bytes",
+ path_len, LTTNG_PATH_MAX);
+ goto end;
+ }
+
+ new_path_view = lttng_buffer_view_from_view(payload, header_len,
+ stream_info.pathname_length);
+
+ stream = stream_get_by_id(stream_info.stream_id);
+ if (!stream) {
+ ret = -1;
+ goto end;
+ }
+
+ pthread_mutex_lock(&stream->lock);
+
+ /*
+ * Update the trace path (just the folder, the stream name does not
+ * change).
+ */
+ free(stream->prev_path_name);
+ stream->prev_path_name = stream->path_name;
+ stream->path_name = create_output_path(new_path_view.data);
+ if (!stream->path_name) {
+ ERR("Failed to create a new output path");
+ ret = -1;
+ goto end_stream_unlock;
+ }
+ ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG,
+ -1, -1);
+ if (ret < 0) {
+ ERR("relay creating output directory");
+ ret = -1;
+ goto end_stream_unlock;
+ }
+
+ assert(stream->current_chunk_id.is_set);
+ stream->current_chunk_id.value = stream_info.new_chunk_id;
+
+ if (stream->is_metadata) {
+ /*
+ * Metadata streams have no index; consider its rotation
+ * complete.
+ */
+ stream->index_rotated = true;
+ /*
+ * The metadata stream is sent only over the control connection
+ * so we know we have all the data to perform the stream
+ * rotation.
+ */
+ ret = do_rotate_stream_data(stream);
+ } else {
+ stream->rotate_at_seq_num = stream_info.rotate_at_seq_num;
+ ret = try_rotate_stream_data(stream);
+ if (ret < 0) {
+ goto end_stream_unlock;
+ }
+
+ ret = try_rotate_stream_index(stream);
+ if (ret < 0) {
+ goto end_stream_unlock;
+ }
+ }
+
+end_stream_unlock:
+ pthread_mutex_unlock(&stream->lock);
+ stream_put(stream);
+end:
+ memset(&reply, 0, sizeof(reply));
+ if (ret < 0) {
+ reply.ret_code = htobe32(LTTNG_ERR_UNK);
+ } else {
+ reply.ret_code = htobe32(LTTNG_OK);
+ }
+ send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
+ sizeof(struct lttcomm_relayd_generic_reply), 0);
+ if (send_ret < (ssize_t) sizeof(reply)) {
+ ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
+ send_ret);
+ ret = -1;
+ }
+
+end_no_reply:
+ return ret;
+}
+
+static int init_session_output_directory_handle(struct relay_session *session,
+ struct lttng_directory_handle *handle)
+{
+ int ret;
+ /* hostname/session_name */
+ char *session_directory = NULL;
+ /*
+ * base path + session_directory
+ * e.g. /home/user/lttng-traces/hostname/session_name
+ */
+ char *full_session_path = NULL;
+
+ pthread_mutex_lock(&session->lock);
+ ret = asprintf(&session_directory, "%s/%s", session->hostname,
+ session->session_name);
+ pthread_mutex_unlock(&session->lock);
+ if (ret < 0) {
+ PERROR("Failed to format session directory name");
+ goto end;
+ }
+
+ full_session_path = create_output_path(session_directory);
+ if (!full_session_path) {
+ ret = -1;
+ goto end;
+ }
+
+ ret = utils_mkdir_recursive(
+ full_session_path, S_IRWXU | S_IRWXG, -1, -1);
+ if (ret) {
+ ERR("Failed to create session output path \"%s\"",
+ full_session_path);
+ goto end;
+ }
+
+ ret = lttng_directory_handle_init(handle, full_session_path);
+ if (ret) {
+ goto end;
+ }
+end:
+ free(session_directory);
+ free(full_session_path);
+ return ret;
+}
+
+/*
+ * relay_create_trace_chunk: create a new trace chunk
+ */
+static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_connection *conn,
+ const struct lttng_buffer_view *payload)
+{
+ int ret = 0;
+ ssize_t send_ret;
+ struct relay_session *session = conn->session;
+ struct lttcomm_relayd_create_trace_chunk *msg;
+ struct lttcomm_relayd_generic_reply reply = {};
+ struct lttng_buffer_view header_view;
+ struct lttng_buffer_view chunk_name_view;
+ struct lttng_trace_chunk *chunk = NULL, *published_chunk = NULL;
+ enum lttng_error_code reply_code = LTTNG_OK;
+ enum lttng_trace_chunk_status chunk_status;
+ struct lttng_directory_handle session_output;
+
+ if (!session || !conn->version_check_done) {
+ ERR("Trying to create a trace chunk before version check");
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ if (session->major == 2 && session->minor < 11) {
+ ERR("Chunk creation command is unsupported before 2.11");
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
+ if (!header_view.data) {
+ ERR("Failed to receive payload of chunk creation command");
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ /* Convert to host endianness. */
+ msg = (typeof(msg)) header_view.data;
+ msg->chunk_id = be64toh(msg->chunk_id);
+ msg->creation_timestamp = be64toh(msg->creation_timestamp);
+ msg->override_name_length = be32toh(msg->override_name_length);
+
+ chunk = lttng_trace_chunk_create(
+ msg->chunk_id, msg->creation_timestamp);
+ if (!chunk) {
+ ERR("Failed to create trace chunk in trace chunk creation command");
+ ret = -1;
+ reply_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ if (msg->override_name_length) {
+ const char *name;
+
+ chunk_name_view = lttng_buffer_view_from_view(payload,
+ sizeof(*msg),
+ msg->override_name_length);
+ name = chunk_name_view.data;
+ if (!name || name[msg->override_name_length - 1]) {
+ ERR("Failed to receive payload of chunk creation command");
+ ret = -1;
+ reply_code = LTTNG_ERR_INVALID;
+ goto end;
+ }
+
+ chunk_status = lttng_trace_chunk_override_name(
+ chunk, chunk_name_view.data);
+ switch (chunk_status) {
+ case LTTNG_TRACE_CHUNK_STATUS_OK:
+ break;
+ case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT:
+ ERR("Failed to set the name of new trace chunk in trace chunk creation command (invalid name)");
+ reply_code = LTTNG_ERR_INVALID;
+ ret = -1;
+ goto end;
+ default:
+ ERR("Failed to set the name of new trace chunk in trace chunk creation command (unknown error)");
+ reply_code = LTTNG_ERR_UNK;
+ ret = -1;
+ goto end;
+ }
+ }
+
+ ret = init_session_output_directory_handle(
+ conn->session, &session_output);
+ if (ret) {
+ reply_code = LTTNG_ERR_CREATE_DIR_FAIL;
+ goto end;
+ }
+
+ chunk_status = lttng_trace_chunk_set_credentials_current_user(chunk);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ reply_code = LTTNG_ERR_UNK;
+ ret = -1;
+ goto end;
+ }
+
+ chunk_status = lttng_trace_chunk_set_as_owner(chunk, &session_output);
+ if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+ reply_code = LTTNG_ERR_UNK;
+ ret = -1;
+ goto end;
+ }
+
+ published_chunk = sessiond_trace_chunk_registry_publish_chunk(
+ sessiond_trace_chunk_registry,
+ conn->session->sessiond_uuid,
+ conn->session->id,
+ chunk);
+ if (!published_chunk) {
+ char uuid_str[UUID_STR_LEN];
+
+ lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
+ ERR("Failed to publish chunk: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
+ uuid_str,
+ conn->session->id,
+ msg->chunk_id);
+ ret = -1;
+ reply_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ pthread_mutex_lock(&conn->session->lock);
+ lttng_trace_chunk_put(conn->session->current_trace_chunk);
+ conn->session->current_trace_chunk = published_chunk;
+ pthread_mutex_unlock(&conn->session->lock);
+ published_chunk = NULL;
+
+end:
+ reply.ret_code = htobe32((uint32_t) reply_code);
+ send_ret = conn->sock->ops->sendmsg(conn->sock,
+ &reply,
+ sizeof(struct lttcomm_relayd_generic_reply),
+ 0);
+ if (send_ret < (ssize_t) sizeof(reply)) {
+ ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
+ send_ret);
+ ret = -1;
+ }
+end_no_reply:
+ lttng_trace_chunk_put(chunk);
+ lttng_trace_chunk_put(published_chunk);
+ lttng_directory_handle_fini(&session_output);
+ return ret;
+}
+
+#define DBG_CMD(cmd_name, conn) \
+ DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
+
+static int relay_process_control_command(struct relay_connection *conn,
+ const struct lttcomm_relayd_hdr *header,
+ const struct lttng_buffer_view *payload)
+{
+ int ret = 0;
+
+ switch (header->cmd) {
+ case RELAYD_CREATE_SESSION:
+ DBG_CMD("RELAYD_CREATE_SESSION", conn);
+ ret = relay_create_session(header, conn, payload);
+ break;
+ case RELAYD_ADD_STREAM:
+ DBG_CMD("RELAYD_ADD_STREAM", conn);
+ ret = relay_add_stream(header, conn, payload);
+ break;
+ case RELAYD_START_DATA:
+ DBG_CMD("RELAYD_START_DATA", conn);
+ ret = relay_start(header, conn, payload);
+ break;
+ case RELAYD_SEND_METADATA:
+ DBG_CMD("RELAYD_SEND_METADATA", conn);
+ ret = relay_recv_metadata(header, conn, payload);
+ break;
+ case RELAYD_VERSION:
+ DBG_CMD("RELAYD_VERSION", conn);
+ ret = relay_send_version(header, conn, payload);
+ break;
+ case RELAYD_CLOSE_STREAM:
+ DBG_CMD("RELAYD_CLOSE_STREAM", conn);
+ ret = relay_close_stream(header, conn, payload);
+ break;
+ case RELAYD_DATA_PENDING:
+ DBG_CMD("RELAYD_DATA_PENDING", conn);
+ ret = relay_data_pending(header, conn, payload);
+ break;
+ case RELAYD_QUIESCENT_CONTROL:
+ DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
+ ret = relay_quiescent_control(header, conn, payload);
+ break;
+ case RELAYD_BEGIN_DATA_PENDING:
+ DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
+ ret = relay_begin_data_pending(header, conn, payload);