X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Fmain.c;h=07e7a012245d5fa0d36fd919f40d00c380070be1;hp=6e5b612f21ae0cc72619a4b2c8ebbeb1d9367467;hb=794e2e5f064718252b249e17914c9b2b089d8d0c;hpb=c04077180977834684b367f97afa22a79fcbd471

diff --git a/src/bin/lttng-relayd/main.c b/src/bin/lttng-relayd/main.c
index 6e5b612f2..07e7a0122 100644
--- a/src/bin/lttng-relayd/main.c
+++ b/src/bin/lttng-relayd/main.c
@@ -34,6 +34,7 @@
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
+#include <sys/resource.h>
 #include <inttypes.h>
 #include <urcu/futex.h>
 #include <urcu/uatomic.h>
@@ -41,6 +42,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <strings.h>
+#include <ctype.h>
 
 #include <lttng/lttng.h>
 #include <common/common.h>
@@ -98,7 +100,7 @@ enum relay_connection_status {
 
 /* command line options */
 char *opt_output_path, *opt_working_directory;
-static int opt_daemon, opt_background, opt_print_version;
+static int opt_daemon, opt_background, opt_print_version, opt_allow_clear = 1;
 enum relay_group_output_by opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_UNKNOWN;
 
 /*
@@ -160,6 +162,9 @@ static uint64_t last_relay_stream_id;
  */
 static struct relay_conn_queue relay_conn_queue;
 
+/* Cap of file desriptors to be in simultaneous use by the relay daemon. */
+static unsigned int lttng_opt_fd_cap;
+
 /* Global relay stream hash table. */
 struct lttng_ht *relay_streams_ht;
 
@@ -181,6 +186,7 @@ static struct option long_options[] = {
 	{ "daemonize", 0, 0, 'd', },
 	{ "background", 0, 0, 'b', },
 	{ "group", 1, 0, 'g', },
+	{ "fd-cap", 1, 0, '\0', },
 	{ "help", 0, 0, 'h', },
 	{ "output", 1, 0, 'o', },
 	{ "verbose", 0, 0, 'v', },
@@ -189,6 +195,7 @@ static struct option long_options[] = {
 	{ "working-directory", 1, 0, 'w', },
 	{ "group-output-by-session", 0, 0, 's', },
 	{ "group-output-by-host", 0, 0, 'p', },
+	{ "disallow-clear", 0, 0, 'x' },
 	{ NULL, 0, 0, 0, },
 };
 
@@ -223,9 +230,34 @@ static int set_option(int opt, const char *arg, const char *optname)
 
 	switch (opt) {
 	case 0:
-		fprintf(stderr, "option %s", optname);
-		if (arg) {
-			fprintf(stderr, " with arg %s\n", arg);
+		if (!strcmp(optname, "fd-cap")) {
+			unsigned long v;
+
+			errno = 0;
+			v = strtoul(arg, NULL, 0);
+			if (errno != 0 || !isdigit(arg[0])) {
+				ERR("Wrong value in --fd-cap parameter: %s",
+						arg);
+				ret = -1;
+				goto end;
+			}
+			if (v < DEFAULT_RELAYD_MINIMAL_FD_CAP) {
+				ERR("File descriptor cap must be set to at least %d",
+						DEFAULT_RELAYD_MINIMAL_FD_CAP);
+			}
+			if (v >= UINT_MAX) {
+				ERR("File descriptor cap overflow in --fd-cap parameter: %s",
+						arg);
+				ret = -1;
+				goto end;
+			}
+			lttng_opt_fd_cap = (unsigned int) v;
+			DBG3("File descriptor cap set to %u", lttng_opt_fd_cap);
+		} else {
+			fprintf(stderr, "unknown option %s", optname);
+			if (arg) {
+				fprintf(stderr, " with arg %s\n", arg);
+			}
 		}
 		break;
 	case 'C':
@@ -355,6 +387,10 @@ static int set_option(int opt, const char *arg, const char *optname)
 		}
 		opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
 		break;
+	case 'x':
+		/* Disallow clear */
+		opt_allow_clear = 0;
+		break;
 	default:
 		/* Unknown option or other error.
 		 * Error is printed by getopt, just return */
@@ -558,10 +594,35 @@ static int set_options(int argc, char **argv)
 			goto exit;
 		}
 	}
+	if (lttng_opt_fd_cap == 0) {
+		int ret;
+		struct rlimit rlimit;
+
+		ret = getrlimit(RLIMIT_NOFILE, &rlimit);
+		if (ret) {
+			PERROR("Failed to get file descriptor limit");
+			retval = -1;
+		}
+
+		lttng_opt_fd_cap = rlimit.rlim_cur;
+	}
 
 	if (opt_group_output_by == RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
 		opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
 	}
+	if (opt_allow_clear) {
+		/* Check if env variable exists. */
+		const char *value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
+		if (value) {
+			ret = config_parse_value(value);
+			if (ret < 0) {
+				ERR("Invalid value for %s specified", DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
+				retval = -1;
+				goto exit;
+			}
+			opt_allow_clear = !ret;
+		}
+	}
 
 exit:
 	free(optstring);
@@ -598,9 +659,18 @@ static void relayd_cleanup(void)
 	free(opt_output_path);
 	free(opt_working_directory);
 
+	if (health_relayd) {
+		health_app_destroy(health_relayd);
+	}
 	/* Close thread quit pipes */
+	utils_close_pipe(health_quit_pipe);
 	utils_close_pipe(thread_quit_pipe);
 
+	if (sessiond_trace_chunk_registry) {
+		sessiond_trace_chunk_registry_destroy(
+				sessiond_trace_chunk_registry);
+	}
+
 	uri_free(control_uri);
 	uri_free(data_uri);
 	/* Live URI is freed in the live thread. */
@@ -1521,7 +1591,7 @@ static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
 
 		vstream = viewer_stream_get_by_id(stream->stream_handle);
 		if (vstream) {
-			if (vstream->metadata_sent == stream->metadata_received) {
+			if (stream->no_new_metadata_notified) {
 				/*
 				 * Since all the metadata has been sent to the
 				 * viewer and that we have a request to close
@@ -2188,6 +2258,9 @@ static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
 		index_info.stream_instance_id =
 				be64toh(index_info.stream_instance_id);
 		index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
+	} else {
+		index_info.stream_instance_id = -1ULL;
+		index_info.packet_seq_num = -1ULL;
 	}
 
 	stream = stream_get_by_id(index_info.relay_stream_id);
@@ -2332,7 +2405,7 @@ static int relay_rotate_session_streams(
 				session->sessiond_uuid, session->id,
 				rotate_streams.new_chunk_id.value);
 		if (!next_trace_chunk) {
-			char uuid_str[UUID_STR_LEN];
+			char uuid_str[LTTNG_UUID_STR_LEN];
 
 			lttng_uuid_to_str(session->sessiond_uuid, uuid_str);
 			ERR("Unknown next trace chunk in ROTATE_STREAMS command: sessiond_uuid = {%s}, session_id = %" PRIu64
@@ -2351,7 +2424,6 @@ static int relay_rotate_session_streams(
 		} else {
 			chunk_id_str = chunk_id_buf;
 		}
-		session->has_rotated = true;
 	}
 
 	DBG("Rotate %" PRIu32 " streams of session \"%s\" to chunk \"%s\"",
@@ -2437,7 +2509,8 @@ static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 	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;
+	struct lttng_directory_handle *session_output = NULL;
+	const char *new_path;
 
 	if (!session || !conn->version_check_done) {
 		ERR("Trying to create a trace chunk before version check");
@@ -2464,8 +2537,29 @@ static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 	msg->creation_timestamp = be64toh(msg->creation_timestamp);
 	msg->override_name_length = be32toh(msg->override_name_length);
 
+	if (session->current_trace_chunk &&
+			!lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
+		chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
+					DEFAULT_CHUNK_TMP_OLD_DIRECTORY);
+		if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+			ERR("Failed to rename old chunk");
+			ret = -1;
+			reply_code = LTTNG_ERR_UNK;
+			goto end;
+		}
+	}
+	session->ongoing_rotation = true;
+	if (!session->current_trace_chunk) {
+		if (!session->has_rotated) {
+			new_path = "";
+		} else {
+			new_path = NULL;
+		}
+	} else {
+		new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY;
+	}
 	chunk = lttng_trace_chunk_create(
-			msg->chunk_id, msg->creation_timestamp);
+			msg->chunk_id, msg->creation_timestamp, new_path);
 	if (!chunk) {
 		ERR("Failed to create trace chunk in trace chunk creation command");
 		ret = -1;
@@ -2512,14 +2606,15 @@ static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 		goto end;
 	}
 
-	ret = session_init_output_directory_handle(
-			conn->session, &session_output);
-	if (ret) {
+	session_output = session_create_output_directory_handle(
+			conn->session);
+	if (!session_output) {
 		reply_code = LTTNG_ERR_CREATE_DIR_FAIL;
 		goto end;
 	}
-	chunk_status = lttng_trace_chunk_set_as_owner(chunk, &session_output);
-	lttng_directory_handle_fini(&session_output);
+	chunk_status = lttng_trace_chunk_set_as_owner(chunk, session_output);
+	lttng_directory_handle_put(session_output);
+	session_output = NULL;
 	if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
 		reply_code = LTTNG_ERR_UNK;
 		ret = -1;
@@ -2532,7 +2627,7 @@ static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 			conn->session->id,
 			chunk);
 	if (!published_chunk) {
-		char uuid_str[UUID_STR_LEN];
+		char uuid_str[LTTNG_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,
@@ -2559,6 +2654,9 @@ static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 			conn->session->current_trace_chunk;
 	conn->session->current_trace_chunk = published_chunk;
 	published_chunk = NULL;
+	if (!conn->session->pending_closure_trace_chunk) {
+		session->ongoing_rotation = false;
+	}
 end_unlock_session:
 	pthread_mutex_unlock(&conn->session->lock);
 end:
@@ -2575,6 +2673,7 @@ end:
 end_no_reply:
 	lttng_trace_chunk_put(chunk);
 	lttng_trace_chunk_put(published_chunk);
+	lttng_directory_handle_put(session_output);
 	return ret;
 }
 
@@ -2601,6 +2700,7 @@ static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 	size_t path_length = 0;
 	const char *chunk_name = NULL;
 	struct lttng_dynamic_buffer reply_payload;
+	const char *new_path;
 
 	lttng_dynamic_buffer_init(&reply_payload);
 
@@ -2638,7 +2738,7 @@ static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 			conn->session->id,
 			chunk_id);
 	if (!chunk) {
-		char uuid_str[UUID_STR_LEN];
+		char uuid_str[LTTNG_UUID_STR_LEN];
 
 		lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
 		ERR("Failed to find chunk to close: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
@@ -2651,6 +2751,20 @@ static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 	}
 
 	pthread_mutex_lock(&session->lock);
+	if (close_command.is_set &&
+			close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE) {
+		/*
+		 * Clear command. It is a protocol error to ask for a
+		 * clear on a relay which does not allow it. Querying
+		 * the configuration allows figuring out whether
+		 * clearing is allowed before doing the clear.
+		 */
+		if (!opt_allow_clear) {
+			ret = -1;
+			reply_code = LTTNG_ERR_INVALID_PROTOCOL;
+			goto end_unlock_session;
+		}
+	}
 	if (session->pending_closure_trace_chunk &&
 			session->pending_closure_trace_chunk != chunk) {
 		ERR("Trace chunk close command for session \"%s\" does not target the trace chunk pending closure",
@@ -2660,6 +2774,43 @@ static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 		goto end_unlock_session;
 	}
 
+	if (session->current_trace_chunk && session->current_trace_chunk != chunk &&
+			!lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
+		if (close_command.is_set &&
+				close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE &&
+				!session->has_rotated) {
+			/* New chunk stays in session output directory. */
+			new_path = "";
+		} else {
+			/* Use chunk name for new chunk. */
+			new_path = NULL;
+		}
+		/* Rename new chunk path. */
+		chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
+				new_path);
+		if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+			ret = -1;
+			goto end;
+		}
+		session->ongoing_rotation = false;
+	}
+	if ((!close_command.is_set ||
+			close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) &&
+			!lttng_trace_chunk_get_name_overridden(chunk)) {
+		const char *old_path;
+
+		if (!session->has_rotated) {
+			old_path = "";
+		} else {
+			old_path = NULL;
+		}
+		/* We need to move back the .tmp_old_chunk to its rightful place. */
+		chunk_status = lttng_trace_chunk_rename_path(chunk, old_path);
+		if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
+			ret = -1;
+			goto end;
+		}
+	}
 	chunk_status = lttng_trace_chunk_set_close_timestamp(
 			chunk, close_timestamp);
 	if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
@@ -2717,6 +2868,10 @@ static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
 			goto end_unlock_session;
 		}
 	}
+	if (close_command.is_set &&
+			close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) {
+		session->has_rotated = true;
+	}
 	DBG("Reply chunk path on close: %s", closed_trace_chunk_path);
 	path_length = strlen(closed_trace_chunk_path) + 1;
 	if (path_length > UINT32_MAX) {
@@ -2843,6 +2998,57 @@ 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);
 
@@ -2921,6 +3127,10 @@ static int relay_process_control_command(struct relay_connection *conn,
 		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);
@@ -3806,6 +4016,8 @@ int main(int argc, char **argv)
 		goto exit_options;
 	}
 
+	DBG("Clear command %s", opt_allow_clear ? "allowed" : "disallowed");
+
 	/* Try to create directory if -o, --output is specified. */
 	if (opt_output_path) {
 		if (*opt_output_path != '/') {
@@ -3856,7 +4068,7 @@ int main(int argc, char **argv)
 	if (!sessiond_trace_chunk_registry) {
 		ERR("Failed to initialize session daemon trace chunk registry");
 		retval = -1;
-		goto exit_sessiond_trace_chunk_registry;
+		goto exit_options;
 	}
 
 	/* Initialize thread health monitoring */
@@ -3864,19 +4076,19 @@ int main(int argc, char **argv)
 	if (!health_relayd) {
 		PERROR("health_app_create error");
 		retval = -1;
-		goto exit_health_app_create;
+		goto exit_options;
 	}
 
 	/* Create thread quit pipe */
 	if (init_thread_quit_pipe()) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* Setup the thread apps communication pipe. */
 	if (create_relay_conn_pipe()) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* Init relay command queue. */
@@ -3890,27 +4102,27 @@ int main(int argc, char **argv)
 	sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
 	if (!sessions_ht) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* tables of streams indexed by stream ID */
 	relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
 	if (!relay_streams_ht) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	/* tables of streams indexed by stream ID */
 	viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
 	if (!viewer_streams_ht) {
 		retval = -1;
-		goto exit_init_data;
+		goto exit_options;
 	}
 
 	ret = utils_create_pipe(health_quit_pipe);
 	if (ret) {
 		retval = -1;
-		goto exit_health_quit_pipe;
+		goto exit_options;
 	}
 
 	/* Create thread to manage the client socket */
@@ -3920,7 +4132,7 @@ int main(int argc, char **argv)
 		errno = ret;
 		PERROR("pthread_create health");
 		retval = -1;
-		goto exit_health_thread;
+		goto exit_options;
 	}
 
 	/* Setup the dispatcher thread */
@@ -4001,16 +4213,6 @@ exit_dispatcher_thread:
 		PERROR("pthread_join health_thread");
 		retval = -1;
 	}
-exit_health_thread:
-
-	utils_close_pipe(health_quit_pipe);
-exit_health_quit_pipe:
-
-exit_init_data:
-	health_app_destroy(health_relayd);
-	sessiond_trace_chunk_registry_destroy(sessiond_trace_chunk_registry);
-exit_health_app_create:
-exit_sessiond_trace_chunk_registry:
 exit_options:
 	/*
 	 * Wait for all pending call_rcu work to complete before tearing