X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=src%2Fbin%2Flttng-relayd%2Flive.c;h=13078026b220b7e3f9e6c3e1c8a0e3009e3e7766;hb=HEAD;hp=d09c2f13ea39af1f0971dcf5aed37273c6503e55;hpb=424150266e9afc978cca8d00f1d70c31f534e656;p=lttng-tools.git diff --git a/src/bin/lttng-relayd/live.c b/src/bin/lttng-relayd/live.c deleted file mode 100644 index d09c2f13e..000000000 --- a/src/bin/lttng-relayd/live.c +++ /dev/null @@ -1,1793 +0,0 @@ -/* - * Copyright (C) 2013 - Julien Desfossez - * David Goulet - * - * 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 -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include "cmd.h" -#include "live.h" -#include "lttng-relayd.h" -#include "lttng-viewer.h" -#include "utils.h" - -static struct lttng_uri *live_uri; - -/* - * Quit pipe for all threads. This permits a single cancellation point - * for all threads when receiving an event on the pipe. - */ -static int live_thread_quit_pipe[2] = { -1, -1 }; - -/* - * This pipe is used to inform the worker thread that a command is queued and - * ready to be processed. - */ -static int live_relay_cmd_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_cmd_queue viewer_cmd_queue; - -static uint64_t last_relay_viewer_session_id; - -/* - * Cleanup the daemon - */ -static -void cleanup(void) -{ - DBG("Cleaning up"); - - free(live_uri); -} - -/* - * Write to writable pipe used to notify a thread. - */ -static -int notify_thread_pipe(int wpipe) -{ - int ret; - - do { - ret = write(wpipe, "!", 1); - } while (ret < 0 && errno == EINTR); - if (ret < 0 || ret != 1) { - PERROR("write poll pipe"); - } - - return ret; -} - -/* - * Stop all threads by closing the thread quit pipe. - */ -static -void stop_threads(void) -{ - int ret; - - /* Stopping all threads */ - DBG("Terminating all live threads"); - ret = notify_thread_pipe(live_thread_quit_pipe[1]); - if (ret < 0) { - ERR("write error on thread quit pipe"); - } - - /* Dispatch thread */ - CMM_STORE_SHARED(live_dispatch_thread_exit, 1); - futex_nto1_wake(&viewer_cmd_queue.futex); -} - -/* - * 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, live_thread_quit_pipe[0], LPOLLIN); - 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 == live_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; - int val = 1; - uint32_t revents, nb_fd; - struct lttng_poll_event events; - struct lttcomm_sock *live_control_sock; - - DBG("[thread] Relay live listener started"); - - live_control_sock = init_socket(live_uri); - if (!live_control_sock) { - goto error_sock_control; - } - - /* - * Pass 3 as size here for the thread quit pipe, control and data socket. - */ - 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; - } - - while (1) { - DBG("Listener accepting live viewers connections"); - -restart: - ret = lttng_poll_wait(&events, -1); - 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++) { - /* Fetch once the poll data */ - revents = LTTNG_POLL_GETEV(&events, i); - pollfd = LTTNG_POLL_GETFD(&events, i); - - /* Thread quit pipe has been closed. Killing thread. */ - ret = check_thread_quit_pipe(pollfd, revents); - if (ret) { - err = 0; - goto exit; - } - - if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { - ERR("socket poll error"); - goto error; - } else if (revents & LPOLLIN) { - /* - * Get allocated in this thread, enqueued to a global queue, - * dequeued and freed in the worker thread. - */ - struct relay_command *relay_cmd; - struct lttcomm_sock *newsock; - - relay_cmd = zmalloc(sizeof(*relay_cmd)); - if (!relay_cmd) { - PERROR("relay command zmalloc"); - goto error; - } - - assert(pollfd == live_control_sock->fd); - newsock = live_control_sock->ops->accept(live_control_sock); - if (!newsock) { - PERROR("accepting control sock"); - free(relay_cmd); - goto error; - } - DBG("Relay viewer connection accepted socket %d", newsock->fd); - ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val, - sizeof(int)); - if (ret < 0) { - PERROR("setsockopt inet"); - lttcomm_destroy_sock(newsock); - free(relay_cmd); - goto error; - } - relay_cmd->sock = newsock; - - /* - * Lock free enqueue the request. - */ - cds_wfq_enqueue(&viewer_cmd_queue.queue, &relay_cmd->node); - - /* - * Wake the dispatch queue futex. Implicit memory - * barrier with the exchange in cds_wfq_enqueue. - */ - futex_nto1_wake(&viewer_cmd_queue.futex); - } - } - } - -exit: -error: -error_poll_add: - 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) { - DBG("Live viewer listener thread exited with error"); - } - DBG("Live viewer listener thread cleanup complete"); - stop_threads(); - return NULL; -} - -/* - * This thread manages the dispatching of the requests to worker threads - */ -static -void *thread_dispatcher(void *data) -{ - int ret; - struct cds_wfq_node *node; - struct relay_command *relay_cmd = NULL; - - DBG("[thread] Live viewer relay dispatcher started"); - - while (!CMM_LOAD_SHARED(live_dispatch_thread_exit)) { - /* Atomically prepare the queue futex */ - futex_nto1_prepare(&viewer_cmd_queue.futex); - - do { - /* Dequeue commands */ - node = cds_wfq_dequeue_blocking(&viewer_cmd_queue.queue); - if (node == NULL) { - DBG("Woken up but nothing in the live-viewer " - "relay command queue"); - /* Continue thread execution */ - break; - } - - relay_cmd = caa_container_of(node, struct relay_command, node); - DBG("Dispatching viewer request waiting on sock %d", - relay_cmd->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 :) - */ - do { - ret = write(live_relay_cmd_pipe[1], relay_cmd, - sizeof(*relay_cmd)); - } while (ret < 0 && errno == EINTR); - free(relay_cmd); - if (ret < 0 || ret != sizeof(struct relay_command)) { - PERROR("write cmd pipe"); - goto error; - } - } while (node != NULL); - - /* Futex wait on queue. Blocking call on futex() */ - futex_nto1_wait(&viewer_cmd_queue.futex); - } - -error: - DBG("Live viewer dispatch thread dying"); - stop_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_command *cmd) -{ - int ret; - struct lttng_viewer_connect reply, msg; - - assert(cmd); - - cmd->version_check_done = 1; - - /* Get version from the other side. */ - ret = cmd->sock->ops->recvmsg(cmd->sock, &msg, sizeof(msg), 0); - if (ret < 0 || ret != sizeof(msg)) { - if (ret == 0) { - /* Orderly shutdown. Not necessary to print an error. */ - DBG("Socket %d did an orderly shutdown", cmd->sock->fd); - } else { - ERR("Relay failed to receive the version values."); - } - ret = -1; - goto end; - } - - 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 (%u vs %u)", reply.major, - be32toh(msg.major)); - ret = 0; - goto end; - } - - cmd->major = reply.major; - /* We adapt to the lowest compatible version */ - if (reply.minor <= be32toh(msg.minor)) { - cmd->minor = reply.minor; - } else { - cmd->minor = be32toh(msg.minor); - } - - if (be32toh(msg.type) == VIEWER_CLIENT_COMMAND) { - cmd->type = RELAY_VIEWER_COMMAND; - } else if (be32toh(msg.type) == VIEWER_CLIENT_NOTIFICATION) { - cmd->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 (cmd->type == RELAY_VIEWER_COMMAND) { - reply.viewer_session_id = htobe64(++last_relay_viewer_session_id); - } - ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, - sizeof(struct lttng_viewer_connect), 0); - if (ret < 0) { - ERR("Relay sending version"); - } - - DBG("Version check done using protocol %u.%u", cmd->major, cmd->minor); - ret = 0; - -end: - return ret; -} - -/* - * Send the viewer the list of current sessions. - * - * Return 0 on success or else a negative value. - */ -static -int viewer_list_sessions(struct relay_command *cmd, - struct lttng_ht *sessions_ht) -{ - int ret; - struct lttng_viewer_list_sessions session_list; - unsigned long count; - long approx_before, approx_after; - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - struct lttng_viewer_session send_session; - struct relay_session *session; - - DBG("List sessions received"); - - if (cmd->version_check_done == 0) { - ERR("Trying to list sessions before version check"); - ret = -1; - goto end_no_session; - } - - rcu_read_lock(); - cds_lfht_count_nodes(sessions_ht->ht, &approx_before, &count, &approx_after); - session_list.sessions_count = htobe32(count); - - ret = cmd->sock->ops->sendmsg(cmd->sock, &session_list, - sizeof(session_list), 0); - if (ret < 0) { - ERR("Relay sending sessions list"); - goto end_unlock; - } - - cds_lfht_for_each_entry(sessions_ht->ht, &iter.iter, node, node) { - node = lttng_ht_iter_get_node_ulong(&iter); - if (!node) { - goto end_unlock; - } - session = caa_container_of(node, struct relay_session, session_n); - - 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); - send_session.clients = htobe32(session->viewer_attached); - - ret = cmd->sock->ops->sendmsg(cmd->sock, &send_session, - sizeof(send_session), 0); - if (ret < 0) { - ERR("Relay sending session info"); - goto end_unlock; - } - } - rcu_read_unlock(); - ret = 0; - goto end; - -end_unlock: - rcu_read_unlock(); - -end: -end_no_session: - return ret; -} - -/* - * Allocate and init a new viewer_stream. - * - * Copies the values from the stream passed in parameter and insert the new - * stream in the viewer_streams_ht. - * - * MUST be called with rcu_read_lock held. - * - * Returns 0 on success or a negative value on error. - */ -static -int init_viewer_stream(struct relay_stream *stream) -{ - int ret; - struct relay_viewer_stream *viewer_stream; - - assert(stream); - - viewer_stream = zmalloc(sizeof(*viewer_stream)); - if (!viewer_stream) { - PERROR("relay viewer stream zmalloc"); - ret = -1; - goto error; - } - - viewer_stream->read_fd = -1; - viewer_stream->index_read_fd = -1; - viewer_stream->session_id = stream->session->id; - viewer_stream->stream_handle = stream->stream_handle; - viewer_stream->path_name = strndup(stream->path_name, - LTTNG_VIEWER_PATH_MAX); - viewer_stream->channel_name = strndup(stream->channel_name, - LTTNG_VIEWER_NAME_MAX); - viewer_stream->total_index_received = stream->total_index_received; - viewer_stream->tracefile_size = stream->tracefile_size; - viewer_stream->tracefile_count = stream->tracefile_count; - viewer_stream->metadata_flag = stream->metadata_flag; - - /* - * This is to avoid a race between the initialization of this object and - * the close of the given stream. If the stream is unable to find this - * viewer stream when closing, this copy will at least take the latest - * value. - */ - viewer_stream->total_index_received = stream->total_index_received; - - /* - * The deletion of this ctf_trace object is only done in a call RCU of the - * relay stream making it valid as long as we have the read side lock. - */ - viewer_stream->ctf_trace = stream->ctf_trace; - uatomic_inc(&viewer_stream->ctf_trace->refcount); - - lttng_ht_node_init_u64(&viewer_stream->stream_n, stream->stream_handle); - lttng_ht_add_unique_u64(viewer_streams_ht, &viewer_stream->stream_n); - - ret = 0; - -error: - return ret; -} - -/* - * Send the viewer the list of current sessions. - */ -static -int viewer_attach_session(struct relay_command *cmd, - struct lttng_ht *sessions_ht) -{ - int ret, send_streams = 0, nb_streams = 0; - struct lttng_viewer_attach_session_request request; - struct lttng_viewer_attach_session_response response; - struct lttng_viewer_stream send_stream; - struct relay_stream *stream; - struct relay_viewer_stream *viewer_stream; - struct lttng_ht_node_ulong *node; - struct lttng_ht_node_u64 *node64; - struct lttng_ht_iter iter; - struct relay_session *session; - - assert(cmd); - assert(sessions_ht); - - DBG("Attach session received"); - - if (cmd->version_check_done == 0) { - ERR("Trying to attach session before version check"); - ret = -1; - goto end_no_session; - } - - ret = cmd->sock->ops->recvmsg(cmd->sock, &request, sizeof(request), 0); - if (ret < 0 || ret != sizeof(request)) { - if (ret == 0) { - /* Orderly shutdown. Not necessary to print an error. */ - DBG("Socket %d did an orderly shutdown", cmd->sock->fd); - } else { - ERR("Relay failed to receive the attach parameters."); - } - ret = -1; - goto error; - } - - rcu_read_lock(); - lttng_ht_lookup(sessions_ht, - (void *)((unsigned long) be64toh(request.session_id)), &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG("Relay session %" PRIu64 " not found", - be64toh(request.session_id)); - response.status = htobe32(VIEWER_ATTACH_UNK); - goto send_reply; - } - - session = caa_container_of(node, struct relay_session, session_n); - if (cmd->session_id == session->id) { - /* Same viewer already attached, just send the stream list. */ - send_streams = 1; - response.status = htobe32(VIEWER_ATTACH_OK); - } else if (session->viewer_attached != 0) { - DBG("Already a viewer attached"); - response.status = htobe32(VIEWER_ATTACH_ALREADY); - goto send_reply; - } else if (session->live_timer == 0) { - DBG("Not live session"); - response.status = htobe32(VIEWER_ATTACH_NOT_LIVE); - goto send_reply; - } else { - session->viewer_attached++; - send_streams = 1; - response.status = htobe32(VIEWER_ATTACH_OK); - cmd->session_id = session->id; - cmd->session = session; - } - - switch (be32toh(request.seek)) { - case VIEWER_SEEK_BEGINNING: - /* Default behaviour. */ - break; - case VIEWER_SEEK_LAST: - /* TODO */ - break; - default: - ERR("Wrong seek parameter"); - response.status = htobe32(VIEWER_ATTACH_SEEK_ERR); - send_streams = 0; - goto send_reply; - } - - if (send_streams) { - /* We should only be there if we have a session to attach to. */ - assert(session); - - /* - * Fill the viewer_streams_ht to count the number of streams - * ready to be sent and avoid concurrency issues on the - * relay_streams_ht and don't rely on a total session stream count. - */ - cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, node, node) { - struct relay_viewer_stream *vstream; - - node = lttng_ht_iter_get_node_ulong(&iter); - if (!node) { - continue; - } - stream = caa_container_of(node, struct relay_stream, stream_n); - if (stream->session != cmd->session) { - continue; - } - - /* - * Don't send streams with no ctf_trace, they are not ready to be - * read. - */ - if (!stream->ctf_trace) { - continue; - } - - vstream = live_find_viewer_stream_by_id(stream->stream_handle); - if (!vstream) { - ret = init_viewer_stream(stream); - if (ret < 0) { - goto end_unlock; - } - } - nb_streams++; - } - response.streams_count = htobe32(nb_streams); - } - -send_reply: - ret = cmd->sock->ops->sendmsg(cmd->sock, &response, sizeof(response), 0); - if (ret < 0) { - ERR("Relay sending viewer attach response"); - goto end_unlock; - } - - /* - * Unknown or busy session, just return gracefully, the viewer knows what - * is happening. - */ - if (!send_streams) { - ret = 0; - goto end_unlock; - } - - /* We should only be there if we have a session to attach to. */ - assert(session); - cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { - node64 = lttng_ht_iter_get_node_u64(&iter); - if (!node64) { - continue; - } - viewer_stream = caa_container_of(node64, struct relay_viewer_stream, - stream_n); - if (viewer_stream->session_id != cmd->session->id) { - continue; - } - - send_stream.id = htobe64(viewer_stream->stream_handle); - send_stream.ctf_trace_id = htobe64(viewer_stream->ctf_trace->id); - send_stream.metadata_flag = htobe32(viewer_stream->metadata_flag); - strncpy(send_stream.path_name, viewer_stream->path_name, - sizeof(send_stream.path_name)); - strncpy(send_stream.channel_name, viewer_stream->channel_name, - sizeof(send_stream.channel_name)); - - ret = cmd->sock->ops->sendmsg(cmd->sock, &send_stream, - sizeof(send_stream), 0); - if (ret < 0) { - ERR("Relay sending stream %" PRIu64, viewer_stream->stream_handle); - goto end_unlock; - } - DBG("Sent stream %" PRIu64 " to viewer", viewer_stream->stream_handle); - } - ret = 0; - -end_unlock: - rcu_read_unlock(); -end_no_session: -error: - return ret; -} - -/* - * Open index file using a given viewer stream. - * - * Return 0 on success or else a negative value. - */ -static int open_index(struct relay_viewer_stream *stream) -{ - int ret; - char fullpath[PATH_MAX]; - struct lttng_packet_index_file_hdr hdr; - - if (stream->tracefile_size > 0) { - /* For now we don't support on-disk ring buffer. */ - ret = -1; - goto end; - } else { - ret = snprintf(fullpath, sizeof(fullpath), "%s/" DEFAULT_INDEX_DIR - "/%s" DEFAULT_INDEX_FILE_SUFFIX, - stream->path_name, stream->channel_name); - if (ret < 0) { - PERROR("snprintf index path"); - goto error; - } - } - - DBG("Opening index file %s in read only", fullpath); - ret = open(fullpath, O_RDONLY); - if (ret < 0) { - if (errno == ENOENT) { - ret = ENOENT; - goto error; - } else { - PERROR("opening index in read-only"); - } - goto error; - } - stream->index_read_fd = ret; - DBG("Opening index file %s in read only, (fd: %d)", fullpath, ret); - - do { - ret = read(stream->index_read_fd, &hdr, sizeof(hdr)); - } while (ret < 0 && errno == EINTR); - if (ret < 0) { - PERROR("Reading index header"); - goto error; - } - if (strncmp(hdr.magic, INDEX_MAGIC, sizeof(hdr.magic)) != 0) { - ERR("Invalid header magic"); - ret = -1; - goto error; - } - if (be32toh(hdr.index_major) != INDEX_MAJOR || - be32toh(hdr.index_minor) != INDEX_MINOR) { - ERR("Invalid header version"); - ret = -1; - goto error; - } - ret = 0; - -error: -end: - return ret; -} - -/* - * Get viewer stream from stream id. - * - * RCU read side lock MUST be acquired. - */ -struct relay_viewer_stream *live_find_viewer_stream_by_id(uint64_t stream_id) -{ - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - struct relay_viewer_stream *stream = NULL; - - lttng_ht_lookup(viewer_streams_ht, &stream_id, &iter); - node = lttng_ht_iter_get_node_u64(&iter); - if (node == NULL) { - DBG("Relay viewer stream %" PRIu64 " not found", stream_id); - goto end; - } - stream = caa_container_of(node, struct relay_viewer_stream, stream_n); - -end: - return stream; -} - -/* - * Send the next index for a stream. - * - * Return 0 on success or else a negative value. - */ -static -int viewer_get_next_index(struct relay_command *cmd, - struct lttng_ht *sessions_ht) -{ - int ret; - struct lttng_viewer_get_next_index request_index; - struct lttng_viewer_index viewer_index; - struct lttng_packet_index packet_index; - struct relay_viewer_stream *vstream; - struct relay_stream *rstream; - - assert(cmd); - assert(sessions_ht); - - DBG("Viewer get next index"); - - if (cmd->version_check_done == 0) { - ERR("Trying to request index before version check"); - ret = -1; - goto end_no_session; - } - - ret = cmd->sock->ops->recvmsg(cmd->sock, &request_index, - sizeof(request_index), 0); - if (ret < 0 || ret != sizeof(request_index)) { - ret = -1; - ERR("Relay didn't receive the whole packet"); - goto end; - } - - rcu_read_lock(); - vstream = live_find_viewer_stream_by_id(be64toh(request_index.stream_id)); - if (!vstream) { - ret = -1; - goto end_unlock; - } - - memset(&viewer_index, 0, sizeof(viewer_index)); - - /* - * The viewer should not ask for index on metadata stream. - */ - if (vstream->metadata_flag) { - viewer_index.status = htobe32(VIEWER_INDEX_HUP); - goto send_reply; - } - - /* First time, we open the index file */ - if (vstream->index_read_fd < 0) { - ret = open_index(vstream); - 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(VIEWER_INDEX_RETRY); - goto send_reply; - } else if (ret < 0) { - viewer_index.status = htobe32(VIEWER_INDEX_ERR); - goto send_reply; - } - } - - rstream = relay_stream_find_by_id(vstream->stream_handle); - if (rstream) { - if (rstream->beacon_ts_end != -1ULL && - vstream->last_sent_index == rstream->total_index_received) { - viewer_index.status = htobe32(VIEWER_INDEX_INACTIVE); - viewer_index.timestamp_end = htobe64(rstream->beacon_ts_end); - goto send_reply; - } - - if (rstream->total_index_received <= vstream->last_sent_index) { - /* No new index to send, retry later. */ - viewer_index.status = htobe32(VIEWER_INDEX_RETRY); - goto send_reply; - } - } else if (!rstream && - vstream->total_index_received == vstream->last_sent_index) { - /* Last index sent and stream closed */ - viewer_index.status = htobe32(VIEWER_INDEX_HUP); - goto send_reply; - } - - if (!vstream->ctf_trace->metadata_received || - vstream->ctf_trace->metadata_received > - vstream->ctf_trace->metadata_sent) { - viewer_index.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; - } - - do { - ret = read(vstream->index_read_fd, &packet_index, - sizeof(packet_index)); - } while (ret < 0 && errno == EINTR); - if (ret < sizeof(packet_index)) { - PERROR("Relay reading index file"); - viewer_index.status = htobe32(VIEWER_INDEX_ERR); - } else { - viewer_index.status = htobe32(VIEWER_INDEX_OK); - vstream->last_sent_index++; - } - - /* - * Indexes are stored in big endian, no need to switch before sending. - */ - 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: - viewer_index.flags = htobe32(viewer_index.flags); - ret = cmd->sock->ops->sendmsg(cmd->sock, &viewer_index, - sizeof(viewer_index), 0); - if (ret < 0) { - ERR("Relay index to viewer"); - goto end_unlock; - } - - DBG("Index %" PRIu64 "for stream %" PRIu64 "sent", - vstream->last_sent_index, vstream->stream_handle); - -end_unlock: - rcu_read_unlock(); - -end_no_session: -end: - 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_command *cmd) -{ - 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 *stream; - - assert(cmd); - - DBG2("Relay get data packet"); - - if (cmd->version_check_done == 0) { - ERR("Trying to get packet before version check"); - ret = -1; - goto end; - } - - ret = cmd->sock->ops->recvmsg(cmd->sock, &get_packet_info, - sizeof(get_packet_info), 0); - if (ret < 0 || ret != sizeof(get_packet_info)) { - ret = -1; - ERR("Relay didn't receive the whole packet"); - goto end; - } - - rcu_read_lock(); - stream = live_find_viewer_stream_by_id(be64toh(get_packet_info.stream_id)); - if (!stream) { - goto error; - } - assert(stream->ctf_trace); - - /* - * First time we read this stream, we need open the tracefile, we should - * only arrive here if an index has already been sent to the viewer, so the - * tracefile must exist, if it does not it is a fatal error. - */ - if (stream->read_fd < 0) { - char fullpath[PATH_MAX]; - - ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, - stream->channel_name); - if (ret < 0) { - goto error; - } - ret = open(fullpath, O_RDONLY); - if (ret < 0) { - PERROR("Relay opening trace file"); - goto error; - } - stream->read_fd = ret; - } - - memset(&reply, 0, sizeof(reply)); - - if (!stream->ctf_trace->metadata_received || - stream->ctf_trace->metadata_received > - stream->ctf_trace->metadata_sent) { - reply.status = htobe32(VIEWER_GET_PACKET_ERR); - reply.flags |= LTTNG_VIEWER_FLAG_NEW_METADATA; - - goto send_reply; - } - - len = be32toh(get_packet_info.len); - data = zmalloc(len); - if (!data) { - PERROR("relay data zmalloc"); - goto error; - } - - ret = lseek(stream->read_fd, be64toh(get_packet_info.offset), SEEK_SET); - if (ret < 0) { - PERROR("lseek"); - goto error; - } - read_len = read(stream->read_fd, data, len); - if (read_len < (ssize_t) len) { - PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64, - stream->read_fd, be64toh(get_packet_info.offset)); - goto error; - } - reply.status = htobe32(VIEWER_GET_PACKET_OK); - reply.len = htobe32(len); - send_data = 1; - goto send_reply; - -error: - reply.status = htobe32(VIEWER_GET_PACKET_ERR); - -send_reply: - reply.flags = htobe32(reply.flags); - ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); - if (ret < 0) { - ERR("Relay data header to viewer"); - goto end_unlock; - } - - if (send_data) { - ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); - if (ret < 0) { - ERR("Relay send data to viewer"); - goto end_unlock; - } - } - - DBG("Sent %u bytes for stream %" PRIu64, len, - be64toh(get_packet_info.stream_id)); - -end_unlock: - free(data); - rcu_read_unlock(); - -end: - return ret; -} - -/* - * Send the session's metadata - * - * Return 0 on success else a negative value. - */ -static -int viewer_get_metadata(struct relay_command *cmd) -{ - 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 *stream; - - assert(cmd); - - DBG("Relay get metadata"); - - if (cmd->version_check_done == 0) { - ERR("Trying to get metadata before version check"); - ret = -1; - goto end; - } - - ret = cmd->sock->ops->recvmsg(cmd->sock, &request, - sizeof(request), 0); - if (ret < 0 || ret != sizeof(request)) { - ret = -1; - ERR("Relay didn't receive the whole packet"); - goto end; - } - - rcu_read_lock(); - stream = live_find_viewer_stream_by_id(be64toh(request.stream_id)); - if (!stream || !stream->metadata_flag) { - ERR("Invalid metadata stream"); - goto error; - } - assert(stream->ctf_trace); - assert(stream->ctf_trace->metadata_sent <= - stream->ctf_trace->metadata_received); - - len = stream->ctf_trace->metadata_received - - stream->ctf_trace->metadata_sent; - if (len == 0) { - reply.status = htobe32(VIEWER_NO_NEW_METADATA); - goto send_reply; - } - - /* first time, we open the metadata file */ - if (stream->read_fd < 0) { - char fullpath[PATH_MAX]; - - ret = snprintf(fullpath, PATH_MAX, "%s/%s", stream->path_name, - stream->channel_name); - if (ret < 0) { - goto error; - } - ret = open(fullpath, O_RDONLY); - if (ret < 0) { - PERROR("Relay opening metadata file"); - goto error; - } - stream->read_fd = ret; - } - - reply.len = htobe64(len); - data = zmalloc(len); - if (!data) { - PERROR("viewer metadata zmalloc"); - goto error; - } - - read_len = read(stream->read_fd, data, len); - if (read_len < (ssize_t) len) { - PERROR("Relay reading metadata file"); - goto error; - } - stream->ctf_trace->metadata_sent += read_len; - reply.status = htobe32(VIEWER_METADATA_OK); - goto send_reply; - -error: - reply.status = htobe32(VIEWER_METADATA_ERR); - -send_reply: - ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0); - if (ret < 0) { - ERR("Relay data header to viewer"); - goto end_unlock; - } - - if (len > 0) { - ret = cmd->sock->ops->sendmsg(cmd->sock, data, len, 0); - if (ret < 0) { - ERR("Relay send data to viewer"); - goto end_unlock; - } - } - - DBG("Sent %" PRIu64 " bytes of metadata for stream %" PRIu64, len, - be64toh(request.stream_id)); - - DBG("Metadata sent"); - -end_unlock: - free(data); - rcu_read_unlock(); -end: - return ret; -} - -/* - * live_relay_unknown_command: send -1 if received unknown command - */ -static -void live_relay_unknown_command(struct relay_command *cmd) -{ - struct lttcomm_relayd_generic_reply reply; - int ret; - - reply.ret_code = htobe32(LTTNG_ERR_UNK); - ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, - sizeof(struct lttcomm_relayd_generic_reply), 0); - if (ret < 0) { - ERR("Relay sending unknown command"); - } -} - -/* - * Process the commands received on the control socket - */ -static -int process_control(struct lttng_viewer_cmd *recv_hdr, - struct relay_command *cmd, struct lttng_ht *sessions_ht) -{ - int ret = 0; - - switch (be32toh(recv_hdr->cmd)) { - case VIEWER_CONNECT: - ret = viewer_connect(cmd); - break; - case VIEWER_LIST_SESSIONS: - ret = viewer_list_sessions(cmd, sessions_ht); - break; - case VIEWER_ATTACH_SESSION: - ret = viewer_attach_session(cmd, sessions_ht); - break; - case VIEWER_GET_NEXT_INDEX: - ret = viewer_get_next_index(cmd, sessions_ht); - break; - case VIEWER_GET_PACKET: - ret = viewer_get_packet(cmd); - break; - case VIEWER_GET_METADATA: - ret = viewer_get_metadata(cmd); - break; - default: - ERR("Received unknown viewer command (%u)", be32toh(recv_hdr->cmd)); - live_relay_unknown_command(cmd); - ret = -1; - goto end; - } - -end: - return ret; -} - -static -void cleanup_poll_connection(struct lttng_poll_event *events, int pollfd) -{ - int ret; - - assert(events); - - lttng_poll_del(events, pollfd); - - ret = close(pollfd); - if (ret < 0) { - ERR("Closing pollfd %d", pollfd); - } -} - -/* - * Create and add connection to the given hash table. - * - * Return poll add value or else -1 on error. - */ -static -int add_connection(int fd, struct lttng_poll_event *events, - struct lttng_ht *relay_connections_ht) -{ - int ret; - struct relay_command *relay_connection; - - assert(events); - assert(relay_connections_ht); - - relay_connection = zmalloc(sizeof(struct relay_command)); - if (relay_connection == NULL) { - PERROR("Relay command zmalloc"); - goto error; - } - - do { - ret = read(fd, relay_connection, sizeof(*relay_connection)); - } while (ret < 0 && errno == EINTR); - if (ret < 0 || ret < sizeof(*relay_connection)) { - PERROR("read relay cmd pipe"); - goto error_read; - } - - lttng_ht_node_init_ulong(&relay_connection->sock_n, - (unsigned long) relay_connection->sock->fd); - rcu_read_lock(); - lttng_ht_add_unique_ulong(relay_connections_ht, - &relay_connection->sock_n); - rcu_read_unlock(); - - return lttng_poll_add(events, relay_connection->sock->fd, - LPOLLIN | LPOLLRDHUP); - -error_read: - free(relay_connection); -error: - return -1; -} - -static -void deferred_free_connection(struct rcu_head *head) -{ - struct relay_command *relay_connection = - caa_container_of(head, struct relay_command, rcu_node); - - if (relay_connection->session && - relay_connection->session->viewer_attached > 0) { - relay_connection->session->viewer_attached--; - } - lttcomm_destroy_sock(relay_connection->sock); - free(relay_connection); -} - -static -void deferred_free_viewer_stream(struct rcu_head *head) -{ - struct relay_viewer_stream *stream = - caa_container_of(head, struct relay_viewer_stream, rcu_node); - - if (stream->ctf_trace) { - uatomic_dec(&stream->ctf_trace->refcount); - assert(uatomic_read(&stream->ctf_trace->refcount) >= 0); - if (uatomic_read(&stream->ctf_trace->refcount) == 0) { - DBG("Freeing ctf_trace %" PRIu64, stream->ctf_trace->id); - free(stream->ctf_trace); - } - } - - free(stream->path_name); - free(stream->channel_name); - free(stream); -} - -static -void viewer_del_streams(uint64_t session_id) -{ - int ret; - struct relay_viewer_stream *stream; - struct lttng_ht_node_u64 *node; - struct lttng_ht_iter iter; - - rcu_read_lock(); - cds_lfht_for_each_entry(viewer_streams_ht->ht, &iter.iter, node, node) { - node = lttng_ht_iter_get_node_u64(&iter); - if (!node) { - continue; - } - - stream = caa_container_of(node, struct relay_viewer_stream, stream_n); - if (stream->session_id != session_id) { - continue; - } - - if (stream->read_fd > 0) { - ret = close(stream->read_fd); - if (ret < 0) { - PERROR("close read_fd"); - } - } - if (stream->index_read_fd > 0) { - ret = close(stream->index_read_fd); - if (ret < 0) { - PERROR("close index_read_fd"); - } - } - if (stream->metadata_flag && stream->ctf_trace) { - stream->ctf_trace->metadata_sent = 0; - } - ret = lttng_ht_del(viewer_streams_ht, &iter); - assert(!ret); - call_rcu(&stream->rcu_node, deferred_free_viewer_stream); - } - rcu_read_unlock(); -} - -/* - * Delete and free a connection. - * - * RCU read side lock MUST be acquired. - */ -static -void del_connection(struct lttng_ht *relay_connections_ht, - struct lttng_ht_iter *iter, struct relay_command *relay_connection) -{ - int ret; - - assert(relay_connections_ht); - assert(iter); - assert(relay_connection); - - ret = lttng_ht_del(relay_connections_ht, iter); - assert(!ret); - - viewer_del_streams(relay_connection->session_id); - - call_rcu(&relay_connection->rcu_node, deferred_free_connection); -} - -/* - * This thread does the actual work - */ -static -void *thread_worker(void *data) -{ - int ret, err = -1; - uint32_t nb_fd; - struct relay_command *relay_connection; - struct lttng_poll_event events; - struct lttng_ht *relay_connections_ht; - struct lttng_ht_node_ulong *node; - struct lttng_ht_iter iter; - struct lttng_viewer_cmd recv_hdr; - struct relay_local_data *relay_ctx = (struct relay_local_data *) data; - struct lttng_ht *sessions_ht = relay_ctx->sessions_ht; - - DBG("[thread] Live viewer relay worker started"); - - rcu_register_thread(); - - /* table of connections indexed on socket */ - relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); - if (!relay_connections_ht) { - goto relay_connections_ht_error; - } - - ret = create_thread_poll_set(&events, 2); - if (ret < 0) { - goto error_poll_create; - } - - ret = lttng_poll_add(&events, live_relay_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); - if (ret < 0) { - goto error; - } - -restart: - while (1) { - int i; - - /* Infinite blocking call, waiting for transmission */ - DBG3("Relayd live viewer worker thread polling..."); - ret = lttng_poll_wait(&events, -1); - 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); - - /* Thread quit pipe has been closed. Killing thread. */ - ret = check_thread_quit_pipe(pollfd, revents); - if (ret) { - err = 0; - goto exit; - } - - /* Inspect the relay cmd pipe for new connection */ - if (pollfd == live_relay_cmd_pipe[0]) { - if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { - ERR("Relay live pipe error"); - goto error; - } else if (revents & LPOLLIN) { - DBG("Relay live viewer command received"); - ret = add_connection(live_relay_cmd_pipe[0], - &events, relay_connections_ht); - if (ret < 0) { - goto error; - } - } - } else if (revents) { - rcu_read_lock(); - lttng_ht_lookup(relay_connections_ht, - (void *)((unsigned long) pollfd), &iter); - node = lttng_ht_iter_get_node_ulong(&iter); - if (node == NULL) { - DBG2("Relay viewer sock %d not found", pollfd); - rcu_read_unlock(); - goto error; - } - relay_connection = caa_container_of(node, struct relay_command, - sock_n); - - if (revents & (LPOLLERR)) { - cleanup_poll_connection(&events, pollfd); - del_connection(relay_connections_ht, &iter, - relay_connection); - } else if (revents & (LPOLLHUP | LPOLLRDHUP)) { - DBG("Viewer socket %d hung up", pollfd); - cleanup_poll_connection(&events, pollfd); - del_connection(relay_connections_ht, &iter, - relay_connection); - } else if (revents & LPOLLIN) { - ret = relay_connection->sock->ops->recvmsg( - relay_connection->sock, &recv_hdr, - sizeof(struct lttng_viewer_cmd), - 0); - /* connection closed */ - if (ret <= 0) { - cleanup_poll_connection(&events, pollfd); - del_connection( relay_connections_ht, &iter, - relay_connection); - DBG("Viewer control connection closed with %d", - pollfd); - } else { - if (relay_connection->session) { - DBG2("Relay viewer worker receiving data for " - "session: %" PRIu64, - relay_connection->session->id); - } - ret = process_control(&recv_hdr, relay_connection, - sessions_ht); - if (ret < 0) { - /* Clear the session on error. */ - cleanup_poll_connection(&events, pollfd); - del_connection(relay_connections_ht, &iter, - relay_connection); - DBG("Viewer connection closed with %d", pollfd); - } - } - } - rcu_read_unlock(); - } - } - } - -exit: -error: - lttng_poll_clean(&events); - - /* empty the hash table and free the memory */ - rcu_read_lock(); - cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter, node, node) { - node = lttng_ht_iter_get_node_ulong(&iter); - if (!node) { - continue; - } - - relay_connection = caa_container_of(node, struct relay_command, - sock_n); - del_connection(relay_connections_ht, &iter, relay_connection); - } - rcu_read_unlock(); -error_poll_create: - lttng_ht_destroy(relay_connections_ht); -relay_connections_ht_error: - /* Close relay cmd pipes */ - utils_close_pipe(live_relay_cmd_pipe); - if (err) { - DBG("Viewer worker thread exited with error"); - } - DBG("Viewer worker thread cleanup complete"); - stop_threads(); - rcu_unregister_thread(); - return NULL; -} - -/* - * Create the relay command pipe to wake thread_manage_apps. - * Closed in cleanup(). - */ -static int create_relay_cmd_pipe(void) -{ - int ret; - - ret = utils_create_pipe_cloexec(live_relay_cmd_pipe); - - return ret; -} - -void live_stop_threads() -{ - int ret; - void *status; - - stop_threads(); - - ret = pthread_join(live_listener_thread, &status); - if (ret != 0) { - PERROR("pthread_join live listener"); - goto error; /* join error, exit without cleanup */ - } - - ret = pthread_join(live_worker_thread, &status); - if (ret != 0) { - PERROR("pthread_join live worker"); - goto error; /* join error, exit without cleanup */ - } - - ret = pthread_join(live_dispatcher_thread, &status); - if (ret != 0) { - PERROR("pthread_join live dispatcher"); - goto error; /* join error, exit without cleanup */ - } - - cleanup(); - -error: - return; -} - -/* - * main - */ -int live_start_threads(struct lttng_uri *uri, - struct relay_local_data *relay_ctx, int quit_pipe[2]) -{ - int ret = 0; - void *status; - int is_root; - - assert(uri); - live_uri = uri; - - live_thread_quit_pipe[0] = quit_pipe[0]; - live_thread_quit_pipe[1] = quit_pipe[1]; - - /* 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"); - ret = -1; - goto exit; - } - } - - /* Setup the thread apps communication pipe. */ - if ((ret = create_relay_cmd_pipe()) < 0) { - goto exit; - } - - /* Init relay command queue. */ - cds_wfq_init(&viewer_cmd_queue.queue); - - /* Set up max poll set size */ - lttng_poll_set_max_size(); - - /* Setup the dispatcher thread */ - ret = pthread_create(&live_dispatcher_thread, NULL, - thread_dispatcher, (void *) NULL); - if (ret != 0) { - PERROR("pthread_create viewer dispatcher"); - goto exit_dispatcher; - } - - /* Setup the worker thread */ - ret = pthread_create(&live_worker_thread, NULL, - thread_worker, relay_ctx); - if (ret != 0) { - PERROR("pthread_create viewer worker"); - goto exit_worker; - } - - /* Setup the listener thread */ - ret = pthread_create(&live_listener_thread, NULL, - thread_listener, (void *) NULL); - if (ret != 0) { - PERROR("pthread_create viewer listener"); - goto exit_listener; - } - - ret = 0; - goto end; - -exit_listener: - ret = pthread_join(live_listener_thread, &status); - if (ret != 0) { - PERROR("pthread_join live listener"); - goto error; /* join error, exit without cleanup */ - } - -exit_worker: - ret = pthread_join(live_worker_thread, &status); - if (ret != 0) { - PERROR("pthread_join live worker"); - goto error; /* join error, exit without cleanup */ - } - -exit_dispatcher: - ret = pthread_join(live_dispatcher_thread, &status); - if (ret != 0) { - PERROR("pthread_join live dispatcher"); - goto error; /* join error, exit without cleanup */ - } - -exit: - cleanup(); - -end: -error: - return ret; -}