+++ /dev/null
-/*
- * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
- * David Goulet <dgoulet@efficios.com>
- * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _GNU_SOURCE
-#define _LGPL_SOURCE
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/mount.h>
-#include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <inttypes.h>
-#include <urcu/futex.h>
-#include <urcu/uatomic.h>
-#include <urcu/rculist.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <config.h>
-
-#include <lttng/lttng.h>
-#include <common/common.h>
-#include <common/compat/poll.h>
-#include <common/compat/socket.h>
-#include <common/compat/endian.h>
-#include <common/defaults.h>
-#include <common/futex.h>
-#include <common/index/index.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/sessiond-comm/inet.h>
-#include <common/sessiond-comm/relayd.h>
-#include <common/uri.h>
-#include <common/utils.h>
-
-#include "cmd.h"
-#include "live.h"
-#include "lttng-relayd.h"
-#include "utils.h"
-#include "health-relayd.h"
-#include "testpoint.h"
-#include "viewer-stream.h"
-#include "stream.h"
-#include "session.h"
-#include "ctf-trace.h"
-#include "connection.h"
-#include "viewer-session.h"
-
-#define SESSION_BUF_DEFAULT_COUNT 16
-
-static struct lttng_uri *live_uri;
-
-/*
- * This pipe is used to inform the worker thread that a command is queued and
- * ready to be processed.
- */
-static int live_conn_pipe[2] = { -1, -1 };
-
-/* Shared between threads */
-static int live_dispatch_thread_exit;
-
-static pthread_t live_listener_thread;
-static pthread_t live_dispatcher_thread;
-static pthread_t live_worker_thread;
-
-/*
- * Relay command queue.
- *
- * The live_thread_listener and live_thread_dispatcher communicate with this
- * queue.
- */
-static struct relay_conn_queue viewer_conn_queue;
-
-static uint64_t last_relay_viewer_session_id;
-static pthread_mutex_t last_relay_viewer_session_id_lock =
- PTHREAD_MUTEX_INITIALIZER;
-
-/*
- * Cleanup the daemon
- */
-static
-void cleanup_relayd_live(void)
-{
- DBG("Cleaning up");
-
- free(live_uri);
-}
-
-/*
- * Receive a request buffer using a given socket, destination allocated buffer
- * of length size.
- *
- * Return the size of the received message or else a negative value on error
- * with errno being set by recvmsg() syscall.
- */
-static
-ssize_t recv_request(struct lttcomm_sock *sock, void *buf, size_t size)
-{
- ssize_t ret;
-
- ret = sock->ops->recvmsg(sock, buf, size, 0);
- if (ret < 0 || ret != size) {
- if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d did an orderly shutdown", sock->fd);
- } else {
- ERR("Relay failed to receive request.");
- }
- ret = -1;
- }
-
- return ret;
-}
-
-/*
- * Send a response buffer using a given socket, source allocated buffer of
- * length size.
- *
- * Return the size of the sent message or else a negative value on error with
- * errno being set by sendmsg() syscall.
- */
-static
-ssize_t send_response(struct lttcomm_sock *sock, void *buf, size_t size)
-{
- ssize_t ret;
-
- ret = sock->ops->sendmsg(sock, buf, size, 0);
- if (ret < 0) {
- ERR("Relayd failed to send response.");
- }
-
- return ret;
-}
-
-/*
- * Atomically check if new streams got added in one of the sessions attached
- * and reset the flag to 0.
- *
- * Returns 1 if new streams got added, 0 if nothing changed, a negative value
- * on error.
- */
-static
-int check_new_streams(struct relay_connection *conn)
-{
- struct relay_session *session;
- unsigned long current_val;
- int ret = 0;
-
- if (!conn->viewer_session) {
- goto end;
- }
- rcu_read_lock();
- cds_list_for_each_entry_rcu(session,
- &conn->viewer_session->session_list,
- viewer_session_node) {
- if (!session_get(session)) {
- continue;
- }
- current_val = uatomic_cmpxchg(&session->new_streams, 1, 0);
- ret = current_val;
- session_put(session);
- if (ret == 1) {
- goto end;
- }
- }
-end:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Send viewer streams to the given socket. The ignore_sent_flag indicates if
- * this function should ignore the sent flag or not.
- *
- * Return 0 on success or else a negative value.
- */
-static
-ssize_t send_viewer_streams(struct lttcomm_sock *sock,
- struct relay_session *session, unsigned int ignore_sent_flag)
-{
- ssize_t ret;
- struct lttng_viewer_stream send_stream;
- struct lttng_ht_iter iter;
- struct relay_viewer_stream *vstream;
-
- rcu_read_lock();
-
- cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, vstream,
- stream_n.node) {
- struct ctf_trace *ctf_trace;
-
- health_code_update();
-
- if (!viewer_stream_get(vstream)) {
- continue;
- }
-
- pthread_mutex_lock(&vstream->stream->lock);
- /* Ignore if not the same session. */
- if (vstream->stream->trace->session->id != session->id ||
- (!ignore_sent_flag && vstream->sent_flag)) {
- pthread_mutex_unlock(&vstream->stream->lock);
- viewer_stream_put(vstream);
- continue;
- }
-
- ctf_trace = vstream->stream->trace;
- send_stream.id = htobe64(vstream->stream->stream_handle);
- send_stream.ctf_trace_id = htobe64(ctf_trace->id);
- send_stream.metadata_flag = htobe32(
- vstream->stream->is_metadata);
- strncpy(send_stream.path_name, vstream->path_name,
- sizeof(send_stream.path_name));
- strncpy(send_stream.channel_name, vstream->channel_name,
- sizeof(send_stream.channel_name));
-
- DBG("Sending stream %" PRIu64 " to viewer",
- vstream->stream->stream_handle);
- vstream->sent_flag = 1;
- pthread_mutex_unlock(&vstream->stream->lock);
-
- ret = send_response(sock, &send_stream, sizeof(send_stream));
- viewer_stream_put(vstream);
- if (ret < 0) {
- goto end_unlock;
- }
- }
-
- ret = 0;
-
-end_unlock:
- rcu_read_unlock();
- return ret;
-}
-
-/*
- * Create every viewer stream possible for the given session with the seek
- * type. Three counters *can* be return which are in order the total amount of
- * viewer stream of the session, the number of unsent stream and the number of
- * stream created. Those counters can be NULL and thus will be ignored.
- *
- * Return 0 on success or else a negative value.
- */
-static
-int make_viewer_streams(struct relay_session *session,
- enum lttng_viewer_seek seek_t, uint32_t *nb_total, uint32_t *nb_unsent,
- uint32_t *nb_created, bool *closed)
-{
- int ret;
- struct lttng_ht_iter iter;
- struct ctf_trace *ctf_trace;
-
- assert(session);
-
- /*
- * Hold the session lock to ensure that we see either none or
- * all initial streams for a session, but no intermediate state.
- */
- pthread_mutex_lock(&session->lock);
-
- if (session->connection_closed) {
- *closed = true;
- }
-
- /*
- * Create viewer streams for relay streams that are ready to be
- * used for a the given session id only.
- */
- rcu_read_lock();
- cds_lfht_for_each_entry(session->ctf_traces_ht->ht, &iter.iter, ctf_trace,
- node.node) {
- struct relay_stream *stream;
-
- health_code_update();
-
- if (!ctf_trace_get(ctf_trace)) {
- continue;
- }
-
- cds_list_for_each_entry_rcu(stream, &ctf_trace->stream_list, stream_node) {
- struct relay_viewer_stream *vstream;
-
- if (!stream_get(stream)) {
- continue;
- }
- /*
- * stream published is protected by the session lock.
- */
- if (!stream->published) {
- goto next;
- }
- vstream = viewer_stream_get_by_id(stream->stream_handle);
- if (!vstream) {
- vstream = viewer_stream_create(stream, seek_t);
- if (!vstream) {
- ret = -1;
- ctf_trace_put(ctf_trace);
- stream_put(stream);
- goto error_unlock;
- }
-
- if (nb_created) {
- /* Update number of created stream counter. */
- (*nb_created)++;
- }
- /*
- * Ensure a self-reference is preserved even
- * after we have put our local reference.
- */
- viewer_stream_get(vstream);
- } else {
- if (!vstream->sent_flag && nb_unsent) {
- /* Update number of unsent stream counter. */
- (*nb_unsent)++;
- }
- }
- /* Update number of total stream counter. */
- if (nb_total) {
- if (stream->is_metadata) {
- if (!stream->closed ||
- stream->metadata_received > vstream->metadata_sent) {
- (*nb_total)++;
- }
- } else {
- if (!stream->closed ||
- !(((int64_t) (stream->prev_seq - stream->last_net_seq_num)) >= 0)) {
-
- (*nb_total)++;
- }
- }
- }
- /* Put local reference. */
- viewer_stream_put(vstream);
- next:
- stream_put(stream);
- }
- ctf_trace_put(ctf_trace);
- }
-
- ret = 0;
-
-error_unlock:
- rcu_read_unlock();
- pthread_mutex_unlock(&session->lock);
- return ret;
-}
-
-int relayd_live_stop(void)
-{
- /* Stop dispatch thread */
- CMM_STORE_SHARED(live_dispatch_thread_exit, 1);
- futex_nto1_wake(&viewer_conn_queue.futex);
- return 0;
-}
-
-/*
- * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
- */
-static
-int create_thread_poll_set(struct lttng_poll_event *events, int size)
-{
- int ret;
-
- if (events == NULL || size == 0) {
- ret = -1;
- goto error;
- }
-
- ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
- if (ret < 0) {
- goto error;
- }
-
- /* Add quit pipe */
- ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
- if (ret < 0) {
- goto error;
- }
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Check if the thread quit pipe was triggered.
- *
- * Return 1 if it was triggered else 0;
- */
-static
-int check_thread_quit_pipe(int fd, uint32_t events)
-{
- if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Create and init socket from uri.
- */
-static
-struct lttcomm_sock *init_socket(struct lttng_uri *uri)
-{
- int ret;
- struct lttcomm_sock *sock = NULL;
-
- sock = lttcomm_alloc_sock_from_uri(uri);
- if (sock == NULL) {
- ERR("Allocating socket");
- goto error;
- }
-
- ret = lttcomm_create_sock(sock);
- if (ret < 0) {
- goto error;
- }
- DBG("Listening on sock %d for live", sock->fd);
-
- ret = sock->ops->bind(sock);
- if (ret < 0) {
- goto error;
- }
-
- ret = sock->ops->listen(sock, -1);
- if (ret < 0) {
- goto error;
-
- }
-
- return sock;
-
-error:
- if (sock) {
- lttcomm_destroy_sock(sock);
- }
- return NULL;
-}
-
-/*
- * This thread manages the listening for new connections on the network
- */
-static
-void *thread_listener(void *data)
-{
- int i, ret, pollfd, err = -1;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- struct lttcomm_sock *live_control_sock;
-
- DBG("[thread] Relay live listener started");
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_LISTENER);
-
- health_code_update();
-
- live_control_sock = init_socket(live_uri);
- if (!live_control_sock) {
- goto error_sock_control;
- }
-
- /* Pass 2 as size here for the thread quit pipe and control sockets. */
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error_create_poll;
- }
-
- /* Add the control socket */
- ret = lttng_poll_add(&events, live_control_sock->fd, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error_poll_add;
- }
-
- lttng_relay_notify_ready();
-
- if (testpoint(relayd_thread_live_listener)) {
- goto error_testpoint;
- }
-
- while (1) {
- health_code_update();
-
- DBG("Listener accepting live viewers connections");
-
-restart:
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
- nb_fd = ret;
-
- DBG("Relay new viewer connection received");
- for (i = 0; i < nb_fd; i++) {
- health_code_update();
-
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- if (revents & LPOLLIN) {
- /*
- * A new connection is requested, therefore a
- * viewer connection is allocated in this
- * thread, enqueued to a global queue and
- * dequeued (and freed) in the worker thread.
- */
- int val = 1;
- struct relay_connection *new_conn;
- struct lttcomm_sock *newsock;
-
- newsock = live_control_sock->ops->accept(live_control_sock);
- if (!newsock) {
- PERROR("accepting control sock");
- goto error;
- }
- DBG("Relay viewer connection accepted socket %d", newsock->fd);
-
- ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
- sizeof(val));
- if (ret < 0) {
- PERROR("setsockopt inet");
- lttcomm_destroy_sock(newsock);
- goto error;
- }
- new_conn = connection_create(newsock, RELAY_CONNECTION_UNKNOWN);
- if (!new_conn) {
- lttcomm_destroy_sock(newsock);
- goto error;
- }
- /* Ownership assumed by the connection. */
- newsock = NULL;
-
- /* Enqueue request for the dispatcher thread. */
- cds_wfcq_enqueue(&viewer_conn_queue.head, &viewer_conn_queue.tail,
- &new_conn->qnode);
-
- /*
- * Wake the dispatch queue futex.
- * Implicit memory barrier with the
- * exchange in cds_wfcq_enqueue.
- */
- futex_nto1_wake(&viewer_conn_queue.futex);
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("socket poll error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
-exit:
-error:
-error_poll_add:
-error_testpoint:
- lttng_poll_clean(&events);
-error_create_poll:
- if (live_control_sock->fd >= 0) {
- ret = live_control_sock->ops->close(live_control_sock);
- if (ret) {
- PERROR("close");
- }
- }
- lttcomm_destroy_sock(live_control_sock);
-error_sock_control:
- if (err) {
- health_error();
- DBG("Live viewer listener thread exited with error");
- }
- health_unregister(health_relayd);
- DBG("Live viewer listener thread cleanup complete");
- if (lttng_relay_stop_threads()) {
- ERR("Error stopping threads");
- }
- return NULL;
-}
-
-/*
- * This thread manages the dispatching of the requests to worker threads
- */
-static
-void *thread_dispatcher(void *data)
-{
- int err = -1;
- ssize_t ret;
- struct cds_wfcq_node *node;
- struct relay_connection *conn = NULL;
-
- DBG("[thread] Live viewer relay dispatcher started");
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER);
-
- if (testpoint(relayd_thread_live_dispatcher)) {
- goto error_testpoint;
- }
-
- health_code_update();
-
- while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) {
- health_code_update();
-
- /* Atomically prepare the queue futex */
- futex_nto1_prepare(&viewer_conn_queue.futex);
-
- do {
- health_code_update();
-
- /* Dequeue commands */
- node = cds_wfcq_dequeue_blocking(&viewer_conn_queue.head,
- &viewer_conn_queue.tail);
- if (node == NULL) {
- DBG("Woken up but nothing in the live-viewer "
- "relay command queue");
- /* Continue thread execution */
- break;
- }
- conn = caa_container_of(node, struct relay_connection, qnode);
- DBG("Dispatching viewer request waiting on sock %d",
- conn->sock->fd);
-
- /*
- * Inform worker thread of the new request. This
- * call is blocking so we can be assured that
- * the data will be read at some point in time
- * or wait to the end of the world :)
- */
- ret = lttng_write(live_conn_pipe[1], &conn, sizeof(conn));
- if (ret < 0) {
- PERROR("write conn pipe");
- connection_put(conn);
- goto error;
- }
- } while (node != NULL);
-
- /* Futex wait on queue. Blocking call on futex() */
- health_poll_entry();
- futex_nto1_wait(&viewer_conn_queue.futex);
- health_poll_exit();
- }
-
- /* Normal exit, no error */
- err = 0;
-
-error:
-error_testpoint:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- DBG("Live viewer dispatch thread dying");
- if (lttng_relay_stop_threads()) {
- ERR("Error stopping threads");
- }
- return NULL;
-}
-
-/*
- * Establish connection with the viewer and check the versions.
- *
- * Return 0 on success or else negative value.
- */
-static
-int viewer_connect(struct relay_connection *conn)
-{
- int ret;
- struct lttng_viewer_connect reply, msg;
-
- conn->version_check_done = 1;
-
- health_code_update();
-
- DBG("Viewer is establishing a connection to the relayd.");
-
- ret = recv_request(conn->sock, &msg, sizeof(msg));
- if (ret < 0) {
- goto end;
- }
-
- health_code_update();
-
- memset(&reply, 0, sizeof(reply));
- reply.major = RELAYD_VERSION_COMM_MAJOR;
- reply.minor = RELAYD_VERSION_COMM_MINOR;
-
- /* Major versions must be the same */
- if (reply.major != be32toh(msg.major)) {
- DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
- reply.major, be32toh(msg.major));
- ret = -1;
- goto end;
- }
-
- conn->major = reply.major;
- /* We adapt to the lowest compatible version */
- if (reply.minor <= be32toh(msg.minor)) {
- conn->minor = reply.minor;
- } else {
- conn->minor = be32toh(msg.minor);
- }
-
- if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_COMMAND) {
- conn->type = RELAY_VIEWER_COMMAND;
- } else if (be32toh(msg.type) == LTTNG_VIEWER_CLIENT_NOTIFICATION) {
- conn->type = RELAY_VIEWER_NOTIFICATION;
- } else {
- ERR("Unknown connection type : %u", be32toh(msg.type));
- ret = -1;
- goto end;
- }
-
- reply.major = htobe32(reply.major);
- reply.minor = htobe32(reply.minor);
- if (conn->type == RELAY_VIEWER_COMMAND) {
- /*
- * Increment outside of htobe64 macro, because the argument can
- * be used more than once within the macro, and thus the
- * operation may be undefined.
- */
- pthread_mutex_lock(&last_relay_viewer_session_id_lock);
- last_relay_viewer_session_id++;
- pthread_mutex_unlock(&last_relay_viewer_session_id_lock);
- reply.viewer_session_id = htobe64(last_relay_viewer_session_id);
- }
-
- health_code_update();
-
- ret = send_response(conn->sock, &reply, sizeof(reply));
- if (ret < 0) {
- goto end;
- }
-
- health_code_update();
-
- DBG("Version check done using protocol %u.%u", conn->major, conn->minor);
- ret = 0;
-
-end:
- return ret;
-}
-
-/*
- * Send the viewer the list of current sessions.
- * We need to create a copy of the hash table content because otherwise
- * we cannot assume the number of entries stays the same between getting
- * the number of HT elements and iteration over the HT.
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_list_sessions(struct relay_connection *conn)
-{
- int ret;
- struct lttng_viewer_list_sessions session_list;
- struct lttng_ht_iter iter;
- struct relay_session *session;
- struct lttng_viewer_session *send_session_buf = NULL;
- uint32_t buf_count = SESSION_BUF_DEFAULT_COUNT;
- uint32_t count = 0;
-
- DBG("List sessions received");
-
- send_session_buf = zmalloc(SESSION_BUF_DEFAULT_COUNT * sizeof(*send_session_buf));
- if (!send_session_buf) {
- return -1;
- }
-
- rcu_read_lock();
- cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, session,
- session_n.node) {
- struct lttng_viewer_session *send_session;
-
- health_code_update();
-
- if (count >= buf_count) {
- struct lttng_viewer_session *newbuf;
- uint32_t new_buf_count = buf_count << 1;
-
- newbuf = realloc(send_session_buf,
- new_buf_count * sizeof(*send_session_buf));
- if (!newbuf) {
- ret = -1;
- rcu_read_unlock();
- goto end_free;
- }
- send_session_buf = newbuf;
- buf_count = new_buf_count;
- }
- send_session = &send_session_buf[count];
- strncpy(send_session->session_name, session->session_name,
- sizeof(send_session->session_name));
- strncpy(send_session->hostname, session->hostname,
- sizeof(send_session->hostname));
- send_session->id = htobe64(session->id);
- send_session->live_timer = htobe32(session->live_timer);
- if (session->viewer_attached) {
- send_session->clients = htobe32(1);
- } else {
- send_session->clients = htobe32(0);
- }
- send_session->streams = htobe32(session->stream_count);
- count++;
- }
- rcu_read_unlock();
-
- session_list.sessions_count = htobe32(count);
-
- health_code_update();
-
- ret = send_response(conn->sock, &session_list, sizeof(session_list));
- if (ret < 0) {
- goto end_free;
- }
-
- health_code_update();
-
- ret = send_response(conn->sock, send_session_buf,
- count * sizeof(*send_session_buf));
- if (ret < 0) {
- goto end_free;
- }
- health_code_update();
-
- ret = 0;
-end_free:
- free(send_session_buf);
- return ret;
-}
-
-/*
- * Send the viewer the list of current streams.
- */
-static
-int viewer_get_new_streams(struct relay_connection *conn)
-{
- int ret, send_streams = 0;
- uint32_t nb_created = 0, nb_unsent = 0, nb_streams = 0, nb_total = 0;
- struct lttng_viewer_new_streams_request request;
- struct lttng_viewer_new_streams_response response;
- struct relay_session *session;
- uint64_t session_id;
- bool closed = false;
-
- assert(conn);
-
- DBG("Get new streams received");
-
- health_code_update();
-
- /* Receive the request from the connected client. */
- ret = recv_request(conn->sock, &request, sizeof(request));
- if (ret < 0) {
- goto error;
- }
- session_id = be64toh(request.session_id);
-
- health_code_update();
-
- memset(&response, 0, sizeof(response));
-
- session = session_get_by_id(session_id);
- if (!session) {
- DBG("Relay session %" PRIu64 " not found", session_id);
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
- goto send_reply;
- }
-
- if (!viewer_session_is_attached(conn->viewer_session, session)) {
- send_streams = 0;
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR);
- goto send_reply;
- }
-
- send_streams = 1;
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_OK);
-
- ret = make_viewer_streams(session, LTTNG_VIEWER_SEEK_LAST, &nb_total, &nb_unsent,
- &nb_created, &closed);
- if (ret < 0) {
- goto end_put_session;
- }
- /* Only send back the newly created streams with the unsent ones. */
- nb_streams = nb_created + nb_unsent;
- response.streams_count = htobe32(nb_streams);
-
- /*
- * If the session is closed, HUP when there are no more streams
- * with data.
- */
- if (closed && nb_total == 0) {
- send_streams = 0;
- response.streams_count = 0;
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
- goto send_reply;
- }
-
-send_reply:
- health_code_update();
- ret = send_response(conn->sock, &response, sizeof(response));
- if (ret < 0) {
- goto end_put_session;
- }
- health_code_update();
-
- /*
- * Unknown or empty session, just return gracefully, the viewer
- * knows what is happening.
- */
- if (!send_streams || !nb_streams) {
- ret = 0;
- goto end_put_session;
- }
-
- /*
- * Send stream and *DON'T* ignore the sent flag so every viewer
- * streams that were not sent from that point will be sent to
- * the viewer.
- */
- ret = send_viewer_streams(conn->sock, session, 0);
- if (ret < 0) {
- goto end_put_session;
- }
-
-end_put_session:
- if (session) {
- session_put(session);
- }
-error:
- return ret;
-}
-
-/*
- * Send the viewer the list of current sessions.
- */
-static
-int viewer_attach_session(struct relay_connection *conn)
-{
- int send_streams = 0;
- ssize_t ret;
- uint32_t nb_streams = 0;
- enum lttng_viewer_seek seek_type;
- struct lttng_viewer_attach_session_request request;
- struct lttng_viewer_attach_session_response response;
- struct relay_session *session = NULL;
- bool closed = false;
-
- assert(conn);
-
- health_code_update();
-
- /* Receive the request from the connected client. */
- ret = recv_request(conn->sock, &request, sizeof(request));
- if (ret < 0) {
- goto error;
- }
-
- health_code_update();
-
- memset(&response, 0, sizeof(response));
-
- if (!conn->viewer_session) {
- DBG("Client trying to attach before creating a live viewer session");
- response.status = htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION);
- goto send_reply;
- }
-
- session = session_get_by_id(be64toh(request.session_id));
- if (!session) {
- DBG("Relay session %" PRIu64 " not found",
- be64toh(request.session_id));
- response.status = htobe32(LTTNG_VIEWER_ATTACH_UNK);
- goto send_reply;
- }
- DBG("Attach session ID %" PRIu64 " received",
- be64toh(request.session_id));
-
- if (session->live_timer == 0) {
- DBG("Not live session");
- response.status = htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE);
- goto send_reply;
- }
-
- send_streams = 1;
- ret = viewer_session_attach(conn->viewer_session, session);
- if (ret) {
- DBG("Already a viewer attached");
- response.status = htobe32(LTTNG_VIEWER_ATTACH_ALREADY);
- goto send_reply;
- }
-
- switch (be32toh(request.seek)) {
- case LTTNG_VIEWER_SEEK_BEGINNING:
- case LTTNG_VIEWER_SEEK_LAST:
- response.status = htobe32(LTTNG_VIEWER_ATTACH_OK);
- seek_type = be32toh(request.seek);
- break;
- default:
- ERR("Wrong seek parameter");
- response.status = htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR);
- send_streams = 0;
- goto send_reply;
- }
-
- ret = make_viewer_streams(session, seek_type, &nb_streams, NULL,
- NULL, &closed);
- if (ret < 0) {
- goto end_put_session;
- }
- response.streams_count = htobe32(nb_streams);
-
- /*
- * If the session is closed when the viewer is attaching, it
- * means some of the streams may have been concurrently removed,
- * so we don't allow the viewer to attach, even if there are
- * streams available.
- */
- if (closed) {
- send_streams = 0;
- response.streams_count = 0;
- response.status = htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP);
- goto send_reply;
- }
-
-send_reply:
- health_code_update();
- ret = send_response(conn->sock, &response, sizeof(response));
- if (ret < 0) {
- goto end_put_session;
- }
- health_code_update();
-
- /*
- * Unknown or empty session, just return gracefully, the viewer
- * knows what is happening.
- */
- if (!send_streams || !nb_streams) {
- ret = 0;
- goto end_put_session;
- }
-
- /* Send stream and ignore the sent flag. */
- ret = send_viewer_streams(conn->sock, session, 1);
- if (ret < 0) {
- goto end_put_session;
- }
-
-end_put_session:
- if (session) {
- session_put(session);
- }
-error:
- return ret;
-}
-
-/*
- * Open the index file if needed for the given vstream.
- *
- * If an index file is successfully opened, the vstream index_fd set with
- * it.
- *
- * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
- *
- * Called with rstream lock held.
- */
-static int try_open_index(struct relay_viewer_stream *vstream,
- struct relay_stream *rstream)
-{
- int ret = 0;
-
- if (vstream->index_fd) {
- goto end;
- }
-
- /*
- * First time, we open the index file and at least one index is ready.
- */
- if (rstream->index_received_seqcount == 0) {
- ret = -ENOENT;
- goto end;
- }
- ret = index_open(vstream->path_name, vstream->channel_name,
- vstream->stream->tracefile_count,
- vstream->current_tracefile_id);
- if (ret >= 0) {
- vstream->index_fd = stream_fd_create(ret);
- if (!vstream->index_fd) {
- if (close(ret)) {
- PERROR("close");
- }
- ret = -1;
- } else {
- ret = 0;
- }
- goto end;
- }
-
-end:
- return ret;
-}
-
-/*
- * Check the status of the index for the given stream. This function
- * updates the index structure if needed and can put (close) the vstream
- * in the HUP situation.
- *
- * Return 0 means that we can proceed with the index. A value of 1 means
- * that the index has been updated and is ready to be sent to the
- * client. A negative value indicates an error that can't be handled.
- *
- * Called with rstream lock held.
- */
-static int check_index_status(struct relay_viewer_stream *vstream,
- struct relay_stream *rstream, struct ctf_trace *trace,
- struct lttng_viewer_index *index)
-{
- int ret;
-
- if (trace->session->connection_closed
- && rstream->index_received_seqcount
- == vstream->index_sent_seqcount) {
- /* Last index sent and session connection is closed. */
- index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
- goto hup;
- } else if (rstream->beacon_ts_end != -1ULL &&
- rstream->index_received_seqcount
- == vstream->index_sent_seqcount) {
- /*
- * We've received a synchronization beacon and the last index
- * available has been sent, the index for now is inactive.
- *
- * In this case, we have received a beacon which allows us to
- * inform the client of a time interval during which we can
- * guarantee that there are no events to read (and never will
- * be).
- */
- index->status = htobe32(LTTNG_VIEWER_INDEX_INACTIVE);
- index->timestamp_end = htobe64(rstream->beacon_ts_end);
- index->stream_id = htobe64(rstream->ctf_stream_id);
- goto index_ready;
- } else if (rstream->index_received_seqcount
- == vstream->index_sent_seqcount) {
- /*
- * This checks whether received == sent seqcount. In
- * this case, we have not received a beacon. Therefore,
- * we can only ask the client to retry later.
- */
- index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
- goto index_ready;
- } else if (!tracefile_array_seq_in_file(rstream->tfa,
- vstream->current_tracefile_id,
- vstream->index_sent_seqcount)) {
- /*
- * The next index we want to send cannot be read either
- * because we need to perform a rotation, or due to
- * the producer having overwritten its trace file.
- */
- DBG("Viewer stream %" PRIu64 " rotation",
- vstream->stream->stream_handle);
- ret = viewer_stream_rotate(vstream);
- if (ret < 0) {
- goto end;
- } else if (ret == 1) {
- /* EOF across entire stream. */
- index->status = htobe32(LTTNG_VIEWER_INDEX_HUP);
- goto hup;
- }
- /*
- * If we have been pushed due to overwrite, it
- * necessarily means there is data that can be read in
- * the stream. If we rotated because we reached the end
- * of a tracefile, it means the following tracefile
- * needs to contain at least one index, else we would
- * have already returned LTTNG_VIEWER_INDEX_RETRY to the
- * viewer. The updated index_sent_seqcount needs to
- * point to a readable index entry now.
- *
- * In the case where we "rotate" on a single file, we
- * can end up in a case where the requested index is
- * still unavailable.
- */
- if (rstream->tracefile_count == 1 &&
- !tracefile_array_seq_in_file(
- rstream->tfa,
- vstream->current_tracefile_id,
- vstream->index_sent_seqcount)) {
- index->status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
- goto index_ready;
- }
- assert(tracefile_array_seq_in_file(rstream->tfa,
- vstream->current_tracefile_id,
- vstream->index_sent_seqcount));
- }
- /* ret == 0 means successful so we continue. */
- ret = 0;
-end:
- return ret;
-
-hup:
- viewer_stream_put(vstream);
-index_ready:
- return 1;
-}
-
-/*
- * Send the next index for a stream.
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_get_next_index(struct relay_connection *conn)
-{
- int ret;
- ssize_t read_ret;
- struct lttng_viewer_get_next_index request_index;
- struct lttng_viewer_index viewer_index;
- struct ctf_packet_index packet_index;
- struct relay_viewer_stream *vstream = NULL;
- struct relay_stream *rstream = NULL;
- struct ctf_trace *ctf_trace = NULL;
- struct relay_viewer_stream *metadata_viewer_stream = NULL;
-
- assert(conn);
-
- DBG("Viewer get next index");
-
- memset(&viewer_index, 0, sizeof(viewer_index));
- health_code_update();
-
- ret = recv_request(conn->sock, &request_index, sizeof(request_index));
- if (ret < 0) {
- goto end;
- }
- health_code_update();
-
- vstream = viewer_stream_get_by_id(be64toh(request_index.stream_id));
- if (!vstream) {
- DBG("Client requested index of unknown stream id %" PRIu64,
- be64toh(request_index.stream_id));
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
- goto send_reply;
- }
-
- /* Use back. ref. Protected by refcounts. */
- rstream = vstream->stream;
- ctf_trace = rstream->trace;
-
- /* metadata_viewer_stream may be NULL. */
- metadata_viewer_stream =
- ctf_trace_get_viewer_metadata_stream(ctf_trace);
-
- pthread_mutex_lock(&rstream->lock);
-
- /*
- * The viewer should not ask for index on metadata stream.
- */
- if (rstream->is_metadata) {
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_HUP);
- goto send_reply;
- }
-
- /* Try to open an index if one is needed for that stream. */
- ret = try_open_index(vstream, rstream);
- if (ret < 0) {
- if (ret == -ENOENT) {
- /*
- * The index is created only when the first data
- * packet arrives, it might not be ready at the
- * beginning of the session
- */
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_RETRY);
- } else {
- /* Unhandled error. */
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
- }
- goto send_reply;
- }
-
- ret = check_index_status(vstream, rstream, ctf_trace, &viewer_index);
- if (ret < 0) {
- goto error_put;
- } else if (ret == 1) {
- /*
- * We have no index to send and check_index_status has populated
- * viewer_index's status.
- */
- goto send_reply;
- }
- /* At this point, ret is 0 thus we will be able to read the index. */
- assert(!ret);
-
- /*
- * vstream->stream_fd may be NULL if it has been closed by
- * tracefile rotation, or if we are at the beginning of the
- * stream. We open the data stream file here to protect against
- * overwrite caused by tracefile rotation (in association with
- * unlink performed before overwrite).
- */
- if (!vstream->stream_fd) {
- char fullpath[PATH_MAX];
-
- if (vstream->stream->tracefile_count > 0) {
- ret = snprintf(fullpath, PATH_MAX, "%s/%s_%" PRIu64,
- vstream->path_name,
- vstream->channel_name,
- vstream->current_tracefile_id);
- } else {
- ret = snprintf(fullpath, PATH_MAX, "%s/%s",
- vstream->path_name,
- vstream->channel_name);
- }
- if (ret < 0) {
- goto error_put;
- }
- ret = open(fullpath, O_RDONLY);
- if (ret < 0) {
- PERROR("Relay opening trace file");
- goto error_put;
- }
- vstream->stream_fd = stream_fd_create(ret);
- if (!vstream->stream_fd) {
- if (close(ret)) {
- PERROR("close");
- }
- goto error_put;
- }
- }
-
- ret = check_new_streams(conn);
- if (ret < 0) {
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
- goto send_reply;
- } else if (ret == 1) {
- viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_STREAM;
- }
-
- read_ret = lttng_read(vstream->index_fd->fd, &packet_index,
- sizeof(packet_index));
- if (read_ret < sizeof(packet_index)) {
- ERR("Relay reading index file %d returned %zd",
- vstream->index_fd->fd, read_ret);
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_ERR);
- goto send_reply;
- } else {
- viewer_index.status = htobe32(LTTNG_VIEWER_INDEX_OK);
- vstream->index_sent_seqcount++;
- }
-
- /*
- * Indexes are stored in big endian, no need to switch before sending.
- */
- DBG("Sending viewer index for stream %" PRIu64 " offset %" PRIu64,
- rstream->stream_handle,
- be64toh(packet_index.offset));
- viewer_index.offset = packet_index.offset;
- viewer_index.packet_size = packet_index.packet_size;
- viewer_index.content_size = packet_index.content_size;
- viewer_index.timestamp_begin = packet_index.timestamp_begin;
- viewer_index.timestamp_end = packet_index.timestamp_end;
- viewer_index.events_discarded = packet_index.events_discarded;
- viewer_index.stream_id = packet_index.stream_id;
-
-send_reply:
- if (rstream) {
- pthread_mutex_unlock(&rstream->lock);
- }
-
- if (metadata_viewer_stream) {
- pthread_mutex_lock(&metadata_viewer_stream->stream->lock);
- DBG("get next index metadata check: recv %" PRIu64
- " sent %" PRIu64,
- metadata_viewer_stream->stream->metadata_received,
- metadata_viewer_stream->metadata_sent);
- if (!metadata_viewer_stream->stream->metadata_received ||
- metadata_viewer_stream->stream->metadata_received >
- metadata_viewer_stream->metadata_sent) {
- viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA;
- }
- pthread_mutex_unlock(&metadata_viewer_stream->stream->lock);
- }
-
- viewer_index.flags = htobe32(viewer_index.flags);
- health_code_update();
-
- ret = send_response(conn->sock, &viewer_index, sizeof(viewer_index));
- if (ret < 0) {
- goto end;
- }
- health_code_update();
-
- if (vstream) {
- DBG("Index %" PRIu64 " for stream %" PRIu64 " sent",
- vstream->index_sent_seqcount,
- vstream->stream->stream_handle);
- }
-end:
- if (metadata_viewer_stream) {
- viewer_stream_put(metadata_viewer_stream);
- }
- if (vstream) {
- viewer_stream_put(vstream);
- }
- return ret;
-
-error_put:
- pthread_mutex_unlock(&rstream->lock);
- if (metadata_viewer_stream) {
- viewer_stream_put(metadata_viewer_stream);
- }
- viewer_stream_put(vstream);
- return ret;
-}
-
-/*
- * Send the next index for a stream
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_get_packet(struct relay_connection *conn)
-{
- int ret, send_data = 0;
- char *data = NULL;
- uint32_t len = 0;
- ssize_t read_len;
- struct lttng_viewer_get_packet get_packet_info;
- struct lttng_viewer_trace_packet reply;
- struct relay_viewer_stream *vstream = NULL;
-
- DBG2("Relay get data packet");
-
- health_code_update();
-
- ret = recv_request(conn->sock, &get_packet_info,
- sizeof(get_packet_info));
- if (ret < 0) {
- goto end;
- }
- health_code_update();
-
- /* From this point on, the error label can be reached. */
- memset(&reply, 0, sizeof(reply));
-
- vstream = viewer_stream_get_by_id(be64toh(get_packet_info.stream_id));
- if (!vstream) {
- DBG("Client requested packet of unknown stream id %" PRIu64,
- be64toh(get_packet_info.stream_id));
- reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
- goto send_reply_nolock;
- }
-
- pthread_mutex_lock(&vstream->stream->lock);
-
- len = be32toh(get_packet_info.len);
- data = zmalloc(len);
- if (!data) {
- PERROR("relay data zmalloc");
- goto error;
- }
-
- ret = lseek(vstream->stream_fd->fd, be64toh(get_packet_info.offset),
- SEEK_SET);
- if (ret < 0) {
- PERROR("lseek fd %d to offset %" PRIu64, vstream->stream_fd->fd,
- be64toh(get_packet_info.offset));
- goto error;
- }
- read_len = lttng_read(vstream->stream_fd->fd, data, len);
- if (read_len < len) {
- PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64,
- vstream->stream_fd->fd,
- be64toh(get_packet_info.offset));
- goto error;
- }
- reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_OK);
- reply.len = htobe32(len);
- send_data = 1;
- goto send_reply;
-
-error:
- reply.status = htobe32(LTTNG_VIEWER_GET_PACKET_ERR);
-
-send_reply:
- if (vstream) {
- pthread_mutex_unlock(&vstream->stream->lock);
- }
-send_reply_nolock:
- reply.flags = htobe32(reply.flags);
-
- health_code_update();
-
- ret = send_response(conn->sock, &reply, sizeof(reply));
- if (ret < 0) {
- goto end_free;
- }
- health_code_update();
-
- if (send_data) {
- health_code_update();
- ret = send_response(conn->sock, data, len);
- if (ret < 0) {
- goto end_free;
- }
- health_code_update();
- }
-
- DBG("Sent %u bytes for stream %" PRIu64, len,
- be64toh(get_packet_info.stream_id));
-
-end_free:
- free(data);
-end:
- if (vstream) {
- viewer_stream_put(vstream);
- }
- return ret;
-}
-
-/*
- * Send the session's metadata
- *
- * Return 0 on success else a negative value.
- */
-static
-int viewer_get_metadata(struct relay_connection *conn)
-{
- int ret = 0;
- ssize_t read_len;
- uint64_t len = 0;
- char *data = NULL;
- struct lttng_viewer_get_metadata request;
- struct lttng_viewer_metadata_packet reply;
- struct relay_viewer_stream *vstream = NULL;
-
- assert(conn);
-
- DBG("Relay get metadata");
-
- health_code_update();
-
- ret = recv_request(conn->sock, &request, sizeof(request));
- if (ret < 0) {
- goto end;
- }
- health_code_update();
-
- memset(&reply, 0, sizeof(reply));
-
- vstream = viewer_stream_get_by_id(be64toh(request.stream_id));
- if (!vstream) {
- /*
- * The metadata stream can be closed by a CLOSE command
- * just before we attach. It can also be closed by
- * per-pid tracing during tracing. Therefore, it is
- * possible that we cannot find this viewer stream.
- * Reply back to the client with an error if we cannot
- * find it.
- */
- DBG("Client requested metadata of unknown stream id %" PRIu64,
- be64toh(request.stream_id));
- reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
- goto send_reply;
- }
- pthread_mutex_lock(&vstream->stream->lock);
- if (!vstream->stream->is_metadata) {
- ERR("Invalid metadata stream");
- goto error;
- }
-
- assert(vstream->metadata_sent <= vstream->stream->metadata_received);
-
- len = vstream->stream->metadata_received - vstream->metadata_sent;
- if (len == 0) {
- reply.status = htobe32(LTTNG_VIEWER_NO_NEW_METADATA);
- goto send_reply;
- }
-
- /* first time, we open the metadata file */
- if (!vstream->stream_fd) {
- char fullpath[PATH_MAX];
-
- ret = snprintf(fullpath, PATH_MAX, "%s/%s", vstream->path_name,
- vstream->channel_name);
- if (ret < 0) {
- goto error;
- }
- ret = open(fullpath, O_RDONLY);
- if (ret < 0) {
- PERROR("Relay opening metadata file");
- goto error;
- }
- vstream->stream_fd = stream_fd_create(ret);
- if (!vstream->stream_fd) {
- if (close(ret)) {
- PERROR("close");
- }
- goto error;
- }
- }
-
- reply.len = htobe64(len);
- data = zmalloc(len);
- if (!data) {
- PERROR("viewer metadata zmalloc");
- goto error;
- }
-
- read_len = lttng_read(vstream->stream_fd->fd, data, len);
- if (read_len < len) {
- PERROR("Relay reading metadata file");
- goto error;
- }
- vstream->metadata_sent += read_len;
- if (vstream->metadata_sent == vstream->stream->metadata_received
- && vstream->stream->closed) {
- /* Release ownership for the viewer metadata stream. */
- viewer_stream_put(vstream);
- }
-
- reply.status = htobe32(LTTNG_VIEWER_METADATA_OK);
-
- goto send_reply;
-
-error:
- reply.status = htobe32(LTTNG_VIEWER_METADATA_ERR);
-
-send_reply:
- health_code_update();
- if (vstream) {
- pthread_mutex_unlock(&vstream->stream->lock);
- }
- ret = send_response(conn->sock, &reply, sizeof(reply));
- if (ret < 0) {
- goto end_free;
- }
- health_code_update();
-
- if (len > 0) {
- ret = send_response(conn->sock, data, len);
- if (ret < 0) {
- goto end_free;
- }
- }
-
- DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len,
- be64toh(request.stream_id));
-
- DBG("Metadata sent");
-
-end_free:
- free(data);
-end:
- if (vstream) {
- viewer_stream_put(vstream);
- }
- return ret;
-}
-
-/*
- * Create a viewer session.
- *
- * Return 0 on success or else a negative value.
- */
-static
-int viewer_create_session(struct relay_connection *conn)
-{
- int ret;
- struct lttng_viewer_create_session_response resp;
-
- DBG("Viewer create session received");
-
- memset(&resp, 0, sizeof(resp));
- resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_OK);
- conn->viewer_session = viewer_session_create();
- if (!conn->viewer_session) {
- ERR("Allocation viewer session");
- resp.status = htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR);
- goto send_reply;
- }
-
-send_reply:
- health_code_update();
- ret = send_response(conn->sock, &resp, sizeof(resp));
- if (ret < 0) {
- goto end;
- }
- health_code_update();
- ret = 0;
-
-end:
- return ret;
-}
-
-
-/*
- * live_relay_unknown_command: send -1 if received unknown command
- */
-static
-void live_relay_unknown_command(struct relay_connection *conn)
-{
- struct lttcomm_relayd_generic_reply reply;
-
- memset(&reply, 0, sizeof(reply));
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- (void) send_response(conn->sock, &reply, sizeof(reply));
-}
-
-/*
- * Process the commands received on the control socket
- */
-static
-int process_control(struct lttng_viewer_cmd *recv_hdr,
- struct relay_connection *conn)
-{
- int ret = 0;
- uint32_t msg_value;
-
- msg_value = be32toh(recv_hdr->cmd);
-
- /*
- * Make sure we've done the version check before any command other then a
- * new client connection.
- */
- if (msg_value != LTTNG_VIEWER_CONNECT && !conn->version_check_done) {
- ERR("Viewer conn value %" PRIu32 " before version check", msg_value);
- ret = -1;
- goto end;
- }
-
- switch (msg_value) {
- case LTTNG_VIEWER_CONNECT:
- ret = viewer_connect(conn);
- break;
- case LTTNG_VIEWER_LIST_SESSIONS:
- ret = viewer_list_sessions(conn);
- break;
- case LTTNG_VIEWER_ATTACH_SESSION:
- ret = viewer_attach_session(conn);
- break;
- case LTTNG_VIEWER_GET_NEXT_INDEX:
- ret = viewer_get_next_index(conn);
- break;
- case LTTNG_VIEWER_GET_PACKET:
- ret = viewer_get_packet(conn);
- break;
- case LTTNG_VIEWER_GET_METADATA:
- ret = viewer_get_metadata(conn);
- break;
- case LTTNG_VIEWER_GET_NEW_STREAMS:
- ret = viewer_get_new_streams(conn);
- break;
- case LTTNG_VIEWER_CREATE_SESSION:
- ret = viewer_create_session(conn);
- break;
- default:
- ERR("Received unknown viewer command (%u)",
- be32toh(recv_hdr->cmd));
- live_relay_unknown_command(conn);
- ret = -1;
- goto end;
- }
-
-end:
- return ret;
-}
-
-static
-void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
-{
- int ret;
-
- (void) lttng_poll_del(events, pollfd);
-
- ret = close(pollfd);
- if (ret < 0) {
- ERR("Closing pollfd %d", pollfd);
- }
-}
-
-/*
- * This thread does the actual work
- */
-static
-void *thread_worker(void *data)
-{
- int ret, err = -1;
- uint32_t nb_fd;
- struct lttng_poll_event events;
- struct lttng_ht *viewer_connections_ht;
- struct lttng_ht_iter iter;
- struct lttng_viewer_cmd recv_hdr;
- struct relay_connection *destroy_conn;
-
- DBG("[thread] Live viewer relay worker started");
-
- rcu_register_thread();
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LIVE_WORKER);
-
- if (testpoint(relayd_thread_live_worker)) {
- goto error_testpoint;
- }
-
- /* table of connections indexed on socket */
- viewer_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- if (!viewer_connections_ht) {
- goto viewer_connections_ht_error;
- }
-
- ret = create_thread_poll_set(&events, 2);
- if (ret < 0) {
- goto error_poll_create;
- }
-
- ret = lttng_poll_add(&events, live_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
-restart:
- while (1) {
- int i;
-
- health_code_update();
-
- /* Infinite blocking call, waiting for transmission */
- DBG3("Relayd live viewer worker thread polling...");
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- /*
- * Process control. The control connection is prioritised so we don't
- * starve it with high throughput tracing data on the data
- * connection.
- */
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- uint32_t revents = LTTNG_POLL_GETEV(&events, i);
- int pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Inspect the relay conn pipe for new connection. */
- if (pollfd == live_conn_pipe[0]) {
- if (revents & LPOLLIN) {
- struct relay_connection *conn;
-
- ret = lttng_read(live_conn_pipe[0],
- &conn, sizeof(conn));
- if (ret < 0) {
- goto error;
- }
- lttng_poll_add(&events, conn->sock->fd,
- LPOLLIN | LPOLLRDHUP);
- connection_ht_add(viewer_connections_ht, conn);
- DBG("Connection socket %d added to poll", conn->sock->fd);
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Relay live pipe error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- } else {
- /* Connection activity. */
- struct relay_connection *conn;
-
- conn = connection_get_by_sock(viewer_connections_ht, pollfd);
- if (!conn) {
- continue;
- }
-
- if (revents & LPOLLIN) {
- ret = conn->sock->ops->recvmsg(conn->sock, &recv_hdr,
- sizeof(recv_hdr), 0);
- if (ret <= 0) {
- /* Connection closed. */
- cleanup_connection_pollfd(&events, pollfd);
- /* Put "create" ownership reference. */
- connection_put(conn);
- DBG("Viewer control conn closed with %d", pollfd);
- } else {
- ret = process_control(&recv_hdr, conn);
- if (ret < 0) {
- /* Clear the session on error. */
- cleanup_connection_pollfd(&events, pollfd);
- /* Put "create" ownership reference. */
- connection_put(conn);
- DBG("Viewer connection closed with %d", pollfd);
- }
- }
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- cleanup_connection_pollfd(&events, pollfd);
- /* Put "create" ownership reference. */
- connection_put(conn);
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- connection_put(conn);
- goto error;
- }
- /* Put local "get_by_sock" reference. */
- connection_put(conn);
- }
- }
- }
-
-exit:
-error:
- lttng_poll_clean(&events);
-
- /* Cleanup reamaining connection object. */
- rcu_read_lock();
- cds_lfht_for_each_entry(viewer_connections_ht->ht, &iter.iter,
- destroy_conn,
- sock_n.node) {
- health_code_update();
- connection_put(destroy_conn);
- }
- rcu_read_unlock();
-error_poll_create:
- lttng_ht_destroy(viewer_connections_ht);
-viewer_connections_ht_error:
- /* Close relay conn pipes */
- utils_close_pipe(live_conn_pipe);
- if (err) {
- DBG("Viewer worker thread exited with error");
- }
- DBG("Viewer worker thread cleanup complete");
-error_testpoint:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- if (lttng_relay_stop_threads()) {
- ERR("Error stopping threads");
- }
- rcu_unregister_thread();
- return NULL;
-}
-
-/*
- * Create the relay command pipe to wake thread_manage_apps.
- * Closed in cleanup().
- */
-static int create_conn_pipe(void)
-{
- return utils_create_pipe_cloexec(live_conn_pipe);
-}
-
-int relayd_live_join(void)
-{
- int ret, retval = 0;
- void *status;
-
- ret = pthread_join(live_listener_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join live listener");
- retval = -1;
- }
-
- ret = pthread_join(live_worker_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join live worker");
- retval = -1;
- }
-
- ret = pthread_join(live_dispatcher_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join live dispatcher");
- retval = -1;
- }
-
- cleanup_relayd_live();
-
- return retval;
-}
-
-/*
- * main
- */
-int relayd_live_create(struct lttng_uri *uri)
-{
- int ret = 0, retval = 0;
- void *status;
- int is_root;
-
- if (!uri) {
- retval = -1;
- goto exit_init_data;
- }
- live_uri = uri;
-
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
-
- if (!is_root) {
- if (live_uri->port < 1024) {
- ERR("Need to be root to use ports < 1024");
- retval = -1;
- goto exit_init_data;
- }
- }
-
- /* Setup the thread apps communication pipe. */
- if (create_conn_pipe()) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Init relay command queue. */
- cds_wfcq_init(&viewer_conn_queue.head, &viewer_conn_queue.tail);
-
- /* Set up max poll set size */
- if (lttng_poll_set_max_size()) {
- retval = -1;
- goto exit_init_data;
- }
-
- /* Setup the dispatcher thread */
- ret = pthread_create(&live_dispatcher_thread, NULL,
- thread_dispatcher, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create viewer dispatcher");
- retval = -1;
- goto exit_dispatcher_thread;
- }
-
- /* Setup the worker thread */
- ret = pthread_create(&live_worker_thread, NULL,
- thread_worker, NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create viewer worker");
- retval = -1;
- goto exit_worker_thread;
- }
-
- /* Setup the listener thread */
- ret = pthread_create(&live_listener_thread, NULL,
- thread_listener, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create viewer listener");
- retval = -1;
- goto exit_listener_thread;
- }
-
- /*
- * All OK, started all threads.
- */
- return retval;
-
- /*
- * Join on the live_listener_thread should anything be added after
- * the live_listener thread's creation.
- */
-
-exit_listener_thread:
-
- ret = pthread_join(live_worker_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join live worker");
- retval = -1;
- }
-exit_worker_thread:
-
- ret = pthread_join(live_dispatcher_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join live dispatcher");
- retval = -1;
- }
-exit_dispatcher_thread:
-
-exit_init_data:
- cleanup_relayd_live();
-
- return retval;
-}
projects / lttng-tools.git / blobdiff