+ reply = (typeof(reply)){
+ .generic.ret_code = htobe32((uint32_t)
+ (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
+ .trace_chunk_exists = ret == 0 ? chunk_exists : 0,
+ };
+ send_ret = conn->sock->ops->sendmsg(
+ conn->sock, &reply, sizeof(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:
+ return ret;
+}
+
+/*
+ * relay_get_configuration: query whether feature is available
+ */
+static int relay_get_configuration(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 lttcomm_relayd_get_configuration *msg;
+ struct lttcomm_relayd_get_configuration_reply reply = {};
+ struct lttng_buffer_view header_view;
+ uint64_t query_flags = 0;
+ uint64_t result_flags = 0;
+
+ header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
+ if (!header_view.data) {
+ ERR("Failed to receive payload of chunk close command");
+ ret = -1;
+ goto end_no_reply;
+ }
+
+ /* Convert to host endianness. */
+ msg = (typeof(msg)) header_view.data;
+ query_flags = be64toh(msg->query_flags);
+
+ if (query_flags) {
+ ret = LTTNG_ERR_INVALID_PROTOCOL;
+ goto reply;
+ }
+ if (opt_allow_clear) {
+ result_flags |= LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED;
+ }
+ ret = 0;
+reply:
+ reply = (typeof(reply)){
+ .generic.ret_code = htobe32((uint32_t)
+ (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
+ .relayd_configuration_flags = htobe64(result_flags),
+ };
+ send_ret = conn->sock->ops->sendmsg(
+ conn->sock, &reply, sizeof(reply), 0);
+ if (send_ret < (ssize_t) sizeof(reply)) {
+ ERR("Failed to send \"get configuration\" command reply (ret = %zd)",
+ send_ret);
+ ret = -1;
+ }
+end_no_reply:
+ 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);
+ break;
+ case RELAYD_END_DATA_PENDING:
+ DBG_CMD("RELAYD_END_DATA_PENDING", conn);
+ ret = relay_end_data_pending(header, conn, payload);
+ break;
+ case RELAYD_SEND_INDEX:
+ DBG_CMD("RELAYD_SEND_INDEX", conn);
+ ret = relay_recv_index(header, conn, payload);
+ break;
+ case RELAYD_STREAMS_SENT:
+ DBG_CMD("RELAYD_STREAMS_SENT", conn);
+ ret = relay_streams_sent(header, conn, payload);
+ break;
+ case RELAYD_RESET_METADATA:
+ DBG_CMD("RELAYD_RESET_METADATA", conn);
+ ret = relay_reset_metadata(header, conn, payload);
+ break;
+ case RELAYD_ROTATE_STREAMS:
+ DBG_CMD("RELAYD_ROTATE_STREAMS", conn);
+ ret = relay_rotate_session_streams(header, conn, payload);
+ break;
+ case RELAYD_CREATE_TRACE_CHUNK:
+ DBG_CMD("RELAYD_CREATE_TRACE_CHUNK", conn);
+ ret = relay_create_trace_chunk(header, conn, payload);
+ break;
+ case RELAYD_CLOSE_TRACE_CHUNK:
+ DBG_CMD("RELAYD_CLOSE_TRACE_CHUNK", conn);
+ ret = relay_close_trace_chunk(header, conn, payload);
+ break;
+ case RELAYD_TRACE_CHUNK_EXISTS:
+ DBG_CMD("RELAYD_TRACE_CHUNK_EXISTS", conn);
+ ret = relay_trace_chunk_exists(header, conn, payload);
+ break;
+ case RELAYD_GET_CONFIGURATION:
+ DBG_CMD("RELAYD_GET_CONFIGURATION", conn);
+ ret = relay_get_configuration(header, conn, payload);
+ break;
+ case RELAYD_UPDATE_SYNC_INFO:
+ default:
+ ERR("Received unknown command (%u)", header->cmd);
+ relay_unknown_command(conn);
+ ret = -1;
+ goto end;
+ }
+
+end:
+ return ret;
+}
+
+static enum relay_connection_status relay_process_control_receive_payload(
+ struct relay_connection *conn)
+{
+ int ret = 0;
+ enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
+ struct lttng_dynamic_buffer *reception_buffer =
+ &conn->protocol.ctrl.reception_buffer;
+ struct ctrl_connection_state_receive_payload *state =
+ &conn->protocol.ctrl.state.receive_payload;
+ struct lttng_buffer_view payload_view;
+
+ if (state->left_to_receive == 0) {
+ /* Short-circuit for payload-less commands. */
+ goto reception_complete;
+ }
+
+ ret = conn->sock->ops->recvmsg(conn->sock,
+ reception_buffer->data + state->received,
+ state->left_to_receive, MSG_DONTWAIT);
+ if (ret < 0) {
+ if (errno != EAGAIN && errno != EWOULDBLOCK) {
+ PERROR("Unable to receive command payload on sock %d",
+ conn->sock->fd);
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ }
+ goto end;
+ } else if (ret == 0) {
+ DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
+ status = RELAY_CONNECTION_STATUS_CLOSED;
+ goto end;
+ }
+
+ assert(ret > 0);
+ assert(ret <= state->left_to_receive);
+
+ state->left_to_receive -= ret;
+ state->received += ret;
+
+ if (state->left_to_receive > 0) {
+ /*
+ * Can't transition to the protocol's next state, wait to
+ * receive the rest of the header.
+ */
+ DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
+ state->received, state->left_to_receive,
+ conn->sock->fd);
+ goto end;
+ }
+
+reception_complete:
+ DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
+ conn->sock->fd, state->received);
+ /*
+ * The payload required to process the command has been received.
+ * A view to the reception buffer is forwarded to the various
+ * commands and the state of the control is reset on success.
+ *
+ * Commands are responsible for sending their reply to the peer.
+ */
+ payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
+ 0, -1);
+ ret = relay_process_control_command(conn,
+ &state->header, &payload_view);
+ if (ret < 0) {
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ goto end;
+ }
+
+ ret = connection_reset_protocol_state(conn);
+ if (ret) {
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ }
+end:
+ return status;
+}
+
+static enum relay_connection_status relay_process_control_receive_header(
+ struct relay_connection *conn)
+{
+ int ret = 0;
+ enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
+ struct lttcomm_relayd_hdr header;
+ struct lttng_dynamic_buffer *reception_buffer =
+ &conn->protocol.ctrl.reception_buffer;
+ struct ctrl_connection_state_receive_header *state =
+ &conn->protocol.ctrl.state.receive_header;
+
+ assert(state->left_to_receive != 0);
+
+ ret = conn->sock->ops->recvmsg(conn->sock,
+ reception_buffer->data + state->received,
+ state->left_to_receive, MSG_DONTWAIT);
+ if (ret < 0) {
+ if (errno != EAGAIN && errno != EWOULDBLOCK) {
+ PERROR("Unable to receive control command header on sock %d",
+ conn->sock->fd);
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ }
+ goto end;
+ } else if (ret == 0) {
+ DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
+ status = RELAY_CONNECTION_STATUS_CLOSED;
+ goto end;
+ }
+
+ assert(ret > 0);
+ assert(ret <= state->left_to_receive);
+
+ state->left_to_receive -= ret;
+ state->received += ret;
+
+ if (state->left_to_receive > 0) {
+ /*
+ * Can't transition to the protocol's next state, wait to
+ * receive the rest of the header.
+ */
+ DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
+ state->received, state->left_to_receive,
+ conn->sock->fd);
+ goto end;
+ }
+
+ /* Transition to next state: receiving the command's payload. */
+ conn->protocol.ctrl.state_id =
+ CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
+ memcpy(&header, reception_buffer->data, sizeof(header));
+ header.circuit_id = be64toh(header.circuit_id);
+ header.data_size = be64toh(header.data_size);
+ header.cmd = be32toh(header.cmd);
+ header.cmd_version = be32toh(header.cmd_version);
+ memcpy(&conn->protocol.ctrl.state.receive_payload.header,
+ &header, sizeof(header));
+
+ DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
+ conn->sock->fd, header.cmd, header.cmd_version,
+ header.data_size);
+
+ if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
+ ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
+ header.data_size);
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ goto end;
+ }
+
+ conn->protocol.ctrl.state.receive_payload.left_to_receive =
+ header.data_size;
+ conn->protocol.ctrl.state.receive_payload.received = 0;
+ ret = lttng_dynamic_buffer_set_size(reception_buffer,
+ header.data_size);
+ if (ret) {
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ goto end;
+ }
+
+ if (header.data_size == 0) {
+ /*
+ * Manually invoke the next state as the poll loop
+ * will not wake-up to allow us to proceed further.
+ */
+ status = relay_process_control_receive_payload(conn);
+ }
+end:
+ return status;
+}
+
+/*
+ * Process the commands received on the control socket
+ */
+static enum relay_connection_status relay_process_control(
+ struct relay_connection *conn)
+{
+ enum relay_connection_status status;
+
+ switch (conn->protocol.ctrl.state_id) {
+ case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
+ status = relay_process_control_receive_header(conn);
+ break;
+ case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
+ status = relay_process_control_receive_payload(conn);
+ break;
+ default:
+ ERR("Unknown control connection protocol state encountered.");
+ abort();
+ }
+
+ return status;
+}
+
+static enum relay_connection_status relay_process_data_receive_header(
+ struct relay_connection *conn)
+{
+ int ret;
+ enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
+ struct data_connection_state_receive_header *state =
+ &conn->protocol.data.state.receive_header;
+ struct lttcomm_relayd_data_hdr header;
+ struct relay_stream *stream;
+
+ assert(state->left_to_receive != 0);
+
+ ret = conn->sock->ops->recvmsg(conn->sock,
+ state->header_reception_buffer + state->received,
+ state->left_to_receive, MSG_DONTWAIT);
+ if (ret < 0) {
+ if (errno != EAGAIN && errno != EWOULDBLOCK) {
+ PERROR("Unable to receive data header on sock %d", conn->sock->fd);
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ }
+ goto end;
+ } else if (ret == 0) {
+ /* Orderly shutdown. Not necessary to print an error. */
+ DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
+ status = RELAY_CONNECTION_STATUS_CLOSED;
+ goto end;
+ }
+
+ assert(ret > 0);
+ assert(ret <= state->left_to_receive);
+
+ state->left_to_receive -= ret;
+ state->received += ret;
+
+ if (state->left_to_receive > 0) {
+ /*
+ * Can't transition to the protocol's next state, wait to
+ * receive the rest of the header.
+ */
+ DBG3("Partial reception of data connection header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
+ state->received, state->left_to_receive,
+ conn->sock->fd);
+ goto end;
+ }
+
+ /* Transition to next state: receiving the payload. */
+ conn->protocol.data.state_id = DATA_CONNECTION_STATE_RECEIVE_PAYLOAD;
+
+ memcpy(&header, state->header_reception_buffer, sizeof(header));
+ header.circuit_id = be64toh(header.circuit_id);
+ header.stream_id = be64toh(header.stream_id);
+ header.data_size = be32toh(header.data_size);
+ header.net_seq_num = be64toh(header.net_seq_num);
+ header.padding_size = be32toh(header.padding_size);
+ memcpy(&conn->protocol.data.state.receive_payload.header, &header, sizeof(header));
+
+ conn->protocol.data.state.receive_payload.left_to_receive =
+ header.data_size;
+ conn->protocol.data.state.receive_payload.received = 0;
+ conn->protocol.data.state.receive_payload.rotate_index = false;
+
+ DBG("Received data connection header on fd %i: circuit_id = %" PRIu64 ", stream_id = %" PRIu64 ", data_size = %" PRIu32 ", net_seq_num = %" PRIu64 ", padding_size = %" PRIu32,
+ conn->sock->fd, header.circuit_id,
+ header.stream_id, header.data_size,
+ header.net_seq_num, header.padding_size);
+
+ stream = stream_get_by_id(header.stream_id);
+ if (!stream) {
+ DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64,
+ header.stream_id);
+ /* Protocol error. */
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ goto end;
+ }
+
+ pthread_mutex_lock(&stream->lock);
+ /* Prepare stream for the reception of a new packet. */
+ ret = stream_init_packet(stream, header.data_size,
+ &conn->protocol.data.state.receive_payload.rotate_index);
+ pthread_mutex_unlock(&stream->lock);
+ if (ret) {
+ ERR("Failed to rotate stream output file");
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ goto end_stream_unlock;
+ }
+
+end_stream_unlock:
+ stream_put(stream);
+end:
+ return status;
+}
+
+static enum relay_connection_status relay_process_data_receive_payload(
+ struct relay_connection *conn)
+{
+ int ret;
+ enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
+ struct relay_stream *stream;
+ struct data_connection_state_receive_payload *state =
+ &conn->protocol.data.state.receive_payload;
+ const size_t chunk_size = RECV_DATA_BUFFER_SIZE;
+ char data_buffer[chunk_size];
+ bool partial_recv = false;
+ bool new_stream = false, close_requested = false, index_flushed = false;
+ uint64_t left_to_receive = state->left_to_receive;
+ struct relay_session *session;
+
+ DBG3("Receiving data for stream id %" PRIu64 " seqnum %" PRIu64 ", %" PRIu64" bytes received, %" PRIu64 " bytes left to receive",
+ state->header.stream_id, state->header.net_seq_num,
+ state->received, left_to_receive);
+
+ stream = stream_get_by_id(state->header.stream_id);
+ if (!stream) {
+ /* Protocol error. */
+ ERR("relay_process_data_receive_payload: cannot find stream %" PRIu64,
+ state->header.stream_id);
+ status = RELAY_CONNECTION_STATUS_ERROR;
+ goto end;
+ }
+
+ pthread_mutex_lock(&stream->lock);
+ session = stream->trace->session;
+ if (!conn->session) {
+ ret = connection_set_session(conn, session);
+ if (ret) {
+ status = RELAY_CONNECTION_STATUS_ERROR;