#include <common/futex.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/sessiond-comm/inet.h>
-#include <common/hashtable/hashtable.h>
#include <common/sessiond-comm/relayd.h>
#include <common/uri.h>
#include <common/utils.h>
+#include "cmd.h"
+#include "index.h"
+#include "utils.h"
#include "lttng-relayd.h"
/* command line options */
+char *opt_output_path;
static int opt_daemon;
-static char *opt_output_path;
static struct lttng_uri *control_uri;
static struct lttng_uri *data_uri;
const char *progname;
-static int is_root; /* Set to 1 if the daemon is running as root */
/*
* Quit pipe for all threads. This permits a single cancellation point
static char *data_buffer;
static unsigned int data_buffer_size;
+/* Global hash table that stores relay index object. */
+static struct lttng_ht *indexes_ht;
+
+/* We need those values for the file/dir creation. */
+static uid_t relayd_uid;
+static gid_t relayd_gid;
+
/*
* usage function on stderr
*/
void usage(void)
{
fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
- fprintf(stderr, " -h, --help Display this usage.\n");
- fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
- fprintf(stderr, " -C, --control-port Control port listening (URI)\n");
- fprintf(stderr, " -D, --data-port Data port listening (URI)\n");
- fprintf(stderr, " -o, --output Output path for traces (PATH)\n");
- fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
+ fprintf(stderr, " -h, --help Display this usage.\n");
+ fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
+ fprintf(stderr, " -C, --control-port URL Control port listening.\n");
+ fprintf(stderr, " -D, --data-port URL Data port listening.\n");
+ fprintf(stderr, " -o, --output PATH Output path for traces. Must use an absolute path.\n");
+ fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
}
static
return NULL;
}
-/*
- * config_get_default_path
- *
- * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer.
- */
-static
-char *config_get_default_path(void)
-{
- return getenv("HOME");
-}
-
-static
-char *create_output_path_auto(char *path_name)
-{
- int ret;
- char *traces_path = NULL;
- char *alloc_path = NULL;
- char *default_path;
-
- default_path = config_get_default_path();
- if (default_path == NULL) {
- ERR("Home path not found.\n \
- Please specify an output path using -o, --output PATH");
- goto exit;
- }
- alloc_path = strdup(default_path);
- if (alloc_path == NULL) {
- PERROR("Path allocation");
- goto exit;
- }
- ret = asprintf(&traces_path, "%s/" DEFAULT_TRACE_DIR_NAME
- "/%s", alloc_path, path_name);
- if (ret < 0) {
- PERROR("asprintf trace dir name");
- goto exit;
- }
-exit:
- free(alloc_path);
- return traces_path;
-}
-
-static
-char *create_output_path_noauto(char *path_name)
-{
- int ret;
- char *traces_path = NULL;
- char *full_path;
-
- full_path = utils_expand_path(opt_output_path);
- if (!full_path) {
- goto exit;
- }
-
- ret = asprintf(&traces_path, "%s/%s", full_path, path_name);
- if (ret < 0) {
- PERROR("asprintf trace dir name");
- goto exit;
- }
-exit:
- free(full_path);
- return traces_path;
-}
-
-/*
- * create_output_path: create the output trace directory
- */
-static
-char *create_output_path(char *path_name)
-{
- if (opt_output_path == NULL) {
- return create_output_path_auto(path_name);
- } else {
- return create_output_path_noauto(path_name);
- }
-}
-
/*
* Get stream from stream id.
* Need to be called with RCU read-side lock held.
{
struct relay_stream *stream =
caa_container_of(head, struct relay_stream, rcu_node);
+ free(stream->path_name);
+ free(stream->channel_name);
free(stream);
}
call_rcu(&stream->rcu_node,
deferred_free_stream);
}
+ /* Cleanup index of that stream. */
+ relay_index_destroy_by_stream_id(stream->stream_handle,
+ indexes_ht);
}
}
rcu_read_unlock();
free(cmd->session);
}
+/*
+ * Copy index data from the control port to a given index object.
+ */
+static void copy_index_control_data(struct relay_index *index,
+ struct lttcomm_relayd_index *data)
+{
+ assert(index);
+ assert(data);
+
+ /*
+ * The index on disk is encoded in big endian, so we don't need to convert
+ * the data received on the network. The data_offset value is NEVER
+ * modified here and is updated by the data thread.
+ */
+ index->index_data.packet_size = data->packet_size;
+ index->index_data.content_size = data->content_size;
+ index->index_data.timestamp_begin = data->timestamp_begin;
+ index->index_data.timestamp_end = data->timestamp_end;
+ index->index_data.events_discarded = data->events_discarded;
+ index->index_data.stream_id = data->stream_id;
+}
+
/*
* Handle the RELAYD_CREATE_SESSION command.
*
struct relay_command *cmd, struct lttng_ht *streams_ht)
{
struct relay_session *session = cmd->session;
- struct lttcomm_relayd_add_stream stream_info;
struct relay_stream *stream = NULL;
struct lttcomm_relayd_status_stream reply;
- char *path = NULL, *root_path = NULL;
int ret, send_ret;
if (!session || cmd->version_check_done == 0) {
goto end_no_session;
}
- ret = cmd->sock->ops->recvmsg(cmd->sock, &stream_info,
- sizeof(struct lttcomm_relayd_add_stream), 0);
- if (ret < sizeof(struct lttcomm_relayd_add_stream)) {
- if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
- } else {
- ERR("Relay didn't receive valid add_stream struct size : %d", ret);
- }
- ret = -1;
- goto end_no_session;
- }
stream = zmalloc(sizeof(struct relay_stream));
if (stream == NULL) {
PERROR("relay stream zmalloc");
goto end_no_session;
}
+ switch (cmd->minor) {
+ case 1: /* LTTng sessiond 2.1 */
+ ret = cmd_recv_stream_2_1(cmd, stream);
+ break;
+ case 2: /* LTTng sessiond 2.2 */
+ default:
+ ret = cmd_recv_stream_2_2(cmd, stream);
+ break;
+ }
+ if (ret < 0) {
+ goto err_free_stream;
+ }
+
rcu_read_lock();
stream->stream_handle = ++last_relay_stream_id;
stream->prev_seq = -1ULL;
stream->session = session;
+ stream->index_fd = -1;
- root_path = create_output_path(stream_info.pathname);
- if (!root_path) {
- ret = -1;
- goto end;
- }
- ret = utils_mkdir_recursive(root_path, S_IRWXU | S_IRWXG);
+ ret = utils_mkdir_recursive(stream->path_name, S_IRWXU | S_IRWXG);
if (ret < 0) {
ERR("relay creating output directory");
goto end;
}
- ret = asprintf(&path, "%s/%s", root_path, stream_info.channel_name);
- if (ret < 0) {
- PERROR("asprintf stream path");
- path = NULL;
- goto end;
- }
-
- ret = open(path, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
+ /*
+ * No need to use run_as API here because whatever we receives, the relayd
+ * uses its own credentials for the stream files.
+ */
+ ret = utils_create_stream_file(stream->path_name, stream->channel_name,
+ stream->tracefile_size, 0, relayd_uid, relayd_gid, NULL);
if (ret < 0) {
- PERROR("Relay creating trace file");
+ ERR("Create output file");
goto end;
}
-
stream->fd = ret;
- DBG("Tracefile %s created", path);
+ if (stream->tracefile_size) {
+ DBG("Tracefile %s/%s_0 created", stream->path_name, stream->channel_name);
+ } else {
+ DBG("Tracefile %s/%s created", stream->path_name, stream->channel_name);
+ }
lttng_ht_node_init_ulong(&stream->stream_n,
(unsigned long) stream->stream_handle);
lttng_ht_add_unique_ulong(streams_ht,
&stream->stream_n);
- DBG("Relay new stream added %s", stream_info.channel_name);
+ DBG("Relay new stream added %s with ID %" PRIu64, stream->channel_name,
+ stream->stream_handle);
end:
- free(path);
- free(root_path);
-
reply.handle = htobe64(stream->stream_handle);
/* send the session id to the client or a negative return code on error */
if (ret < 0) {
end_no_session:
return ret;
+
+err_free_stream:
+ free(stream->path_name);
+ free(stream->channel_name);
+ free(stream);
+ return ret;
}
/*
if (delret < 0) {
PERROR("close stream");
}
+
+ if (stream->index_fd >= 0) {
+ delret = close(stream->index_fd);
+ if (delret < 0) {
+ PERROR("close stream index_fd");
+ }
+ }
iter.iter.node = &stream->stream_n.node;
delret = lttng_ht_del(streams_ht, &iter);
assert(!delret);
*/
static
int relay_send_version(struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_command *cmd)
+ struct relay_command *cmd, struct lttng_ht *streams_ht)
{
int ret;
struct lttcomm_relayd_version reply, msg;
goto end;
}
- /*
- * For now, we just ignore the received version but after 2.1 stable
- * release, a check must be done to see if we either adapt to the other
- * side version (which MUST be lower than us) or keep the latest data
- * structure considering that the other side will adapt.
- */
+ reply.major = RELAYD_VERSION_COMM_MAJOR;
+ reply.minor = RELAYD_VERSION_COMM_MINOR;
- ret = sscanf(VERSION, "%10u.%10u", &reply.major, &reply.minor);
- if (ret < 2) {
- ERR("Error in scanning version");
- ret = -1;
+ /* Major versions must be the same */
+ if (reply.major != be32toh(msg.major)) {
+ DBG("Incompatible major versions (%u vs %u), deleting session",
+ reply.major, be32toh(msg.major));
+ relay_delete_session(cmd, streams_ht);
+ 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);
+ }
+
reply.major = htobe32(reply.major);
reply.minor = htobe32(reply.minor);
ret = cmd->sock->ops->sendmsg(cmd->sock, &reply,
if (ret < 0) {
ERR("Relay sending version");
}
- DBG("Version check done (%u.%u)", be32toh(reply.major),
- be32toh(reply.minor));
+
+ DBG("Version check done using protocol %u.%u", cmd->major,
+ cmd->minor);
end:
return ret;
return ret;
}
+/*
+ * Receive an index for a specific stream.
+ *
+ * Return 0 on success else a negative value.
+ */
+static
+int relay_recv_index(struct lttcomm_relayd_hdr *recv_hdr,
+ struct relay_command *cmd, struct lttng_ht *streams_ht,
+ struct lttng_ht *indexes_ht)
+{
+ int ret, send_ret, index_created = 0;
+ struct relay_session *session = cmd->session;
+ struct lttcomm_relayd_index index_info;
+ struct relay_index *index, *wr_index = NULL;
+ struct lttcomm_relayd_generic_reply reply;
+ struct relay_stream *stream;
+ uint64_t net_seq_num;
+
+ assert(cmd);
+ assert(streams_ht);
+ assert(indexes_ht);
+
+ DBG("Relay receiving index");
+
+ if (!session || cmd->version_check_done == 0) {
+ ERR("Trying to close a stream before version check");
+ ret = -1;
+ goto end_no_session;
+ }
+
+ ret = cmd->sock->ops->recvmsg(cmd->sock, &index_info,
+ sizeof(index_info), 0);
+ if (ret < sizeof(index_info)) {
+ if (ret == 0) {
+ /* Orderly shutdown. Not necessary to print an error. */
+ DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
+ } else {
+ ERR("Relay didn't receive valid index struct size : %d", ret);
+ }
+ ret = -1;
+ goto end_no_session;
+ }
+
+ net_seq_num = be64toh(index_info.net_seq_num);
+
+ rcu_read_lock();
+ stream = relay_stream_from_stream_id(be64toh(index_info.relay_stream_id),
+ streams_ht);
+ if (!stream) {
+ ret = -1;
+ goto end_rcu_unlock;
+ }
+
+ index = relay_index_find(stream->stream_handle, net_seq_num, indexes_ht);
+ if (!index) {
+ /* A successful creation will add the object to the HT. */
+ index = relay_index_create(stream->stream_handle, net_seq_num);
+ if (!index) {
+ goto end_rcu_unlock;
+ }
+ index_created = 1;
+ }
+
+ copy_index_control_data(index, &index_info);
+
+ if (index_created) {
+ /*
+ * Try to add the relay index object to the hash table. If an object
+ * already exist, destroy back the index created, set the data in this
+ * object and write it on disk.
+ */
+ relay_index_add(index, indexes_ht, &wr_index);
+ if (wr_index) {
+ copy_index_control_data(wr_index, &index_info);
+ free(index);
+ }
+ } else {
+ /* The index already exists so write it on disk. */
+ wr_index = index;
+ }
+
+ /* Do we have a writable ready index to write on disk. */
+ if (wr_index) {
+ /* Starting at 2.4, create the index file if none available. */
+ if (cmd->minor >= 4 && stream->index_fd < 0) {
+ ret = index_create_file(stream->path_name, stream->channel_name,
+ relayd_uid, relayd_gid, stream->tracefile_size,
+ stream->tracefile_count_current);
+ if (ret < 0) {
+ goto end_rcu_unlock;
+ }
+ stream->index_fd = ret;
+ }
+
+ ret = relay_index_write(wr_index->fd, wr_index, indexes_ht);
+ if (ret < 0) {
+ goto end_rcu_unlock;
+ }
+ }
+
+end_rcu_unlock:
+ rcu_read_unlock();
+
+ if (ret < 0) {
+ reply.ret_code = htobe32(LTTNG_ERR_UNK);
+ } else {
+ reply.ret_code = htobe32(LTTNG_OK);
+ }
+ send_ret = cmd->sock->ops->sendmsg(cmd->sock, &reply, sizeof(reply), 0);
+ if (send_ret < 0) {
+ ERR("Relay sending close index id reply");
+ ret = send_ret;
+ }
+
+end_no_session:
+ return ret;
+}
+
/*
* relay_process_control: Process the commands received on the control socket
*/
static
int relay_process_control(struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_command *cmd, struct lttng_ht *streams_ht)
+ struct relay_command *cmd, struct lttng_ht *streams_ht,
+ struct lttng_ht *index_streams_ht,
+ struct lttng_ht *indexes_ht)
{
int ret = 0;
ret = relay_recv_metadata(recv_hdr, cmd, streams_ht);
break;
case RELAYD_VERSION:
- ret = relay_send_version(recv_hdr, cmd);
+ ret = relay_send_version(recv_hdr, cmd, streams_ht);
break;
case RELAYD_CLOSE_STREAM:
ret = relay_close_stream(recv_hdr, cmd, streams_ht);
case RELAYD_END_DATA_PENDING:
ret = relay_end_data_pending(recv_hdr, cmd, streams_ht);
break;
+ case RELAYD_SEND_INDEX:
+ ret = relay_recv_index(recv_hdr, cmd, streams_ht, indexes_ht);
+ break;
case RELAYD_UPDATE_SYNC_INFO:
default:
ERR("Received unknown command (%u)", be32toh(recv_hdr->cmd));
* relay_process_data: Process the data received on the data socket
*/
static
-int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht)
+int relay_process_data(struct relay_command *cmd, struct lttng_ht *streams_ht,
+ struct lttng_ht *indexes_ht)
{
- int ret = 0;
+ int ret = 0, rotate_index = 0, index_created = 0;
struct relay_stream *stream;
+ struct relay_index *index, *wr_index = NULL;
struct lttcomm_relayd_data_hdr data_hdr;
- uint64_t stream_id;
+ uint64_t stream_id, data_offset;
uint64_t net_seq_num;
uint32_t data_size;
stream = relay_stream_from_stream_id(stream_id, streams_ht);
if (!stream) {
ret = -1;
- goto end_unlock;
+ goto end_rcu_unlock;
}
data_size = be32toh(data_hdr.data_size);
ERR("Allocating data buffer");
free(data_buffer);
ret = -1;
- goto end_unlock;
+ goto end_rcu_unlock;
}
data_buffer = tmp_data_ptr;
data_buffer_size = data_size;
DBG("Socket %d did an orderly shutdown", cmd->sock->fd);
}
ret = -1;
- goto end_unlock;
+ goto end_rcu_unlock;
+ }
+
+ /* Check if a rotation is needed. */
+ if (stream->tracefile_size > 0 &&
+ (stream->tracefile_size_current + data_size) >
+ stream->tracefile_size) {
+ ret = utils_rotate_stream_file(stream->path_name, stream->channel_name,
+ stream->tracefile_size, stream->tracefile_count,
+ relayd_uid, relayd_gid, stream->fd,
+ &(stream->tracefile_count_current), &stream->fd);
+ if (ret < 0) {
+ ERR("Rotating stream output file");
+ goto end_rcu_unlock;
+ }
+ /* Reset current size because we just perform a stream rotation. */
+ stream->tracefile_size_current = 0;
+ rotate_index = 1;
+ }
+
+ /* Get data offset because we are about to update the index. */
+ data_offset = htobe64(stream->tracefile_size_current);
+
+ /*
+ * Lookup for an existing index for that stream id/sequence number. If on
+ * exists, the control thread already received the data for it thus we need
+ * to write it on disk.
+ */
+ index = relay_index_find(stream_id, net_seq_num, indexes_ht);
+ if (!index) {
+ /* A successful creation will add the object to the HT. */
+ index = relay_index_create(stream->stream_handle, net_seq_num);
+ if (!index) {
+ goto end_rcu_unlock;
+ }
+ index_created = 1;
+ }
+
+ if (rotate_index || stream->index_fd < 0) {
+ index->to_close_fd = stream->index_fd;
+ ret = index_create_file(stream->path_name, stream->channel_name,
+ relayd_uid, relayd_gid, stream->tracefile_size,
+ stream->tracefile_count_current);
+ if (ret < 0) {
+ /* This will close the stream's index fd if one. */
+ relay_index_free_safe(index);
+ goto end_rcu_unlock;
+ }
+ stream->index_fd = ret;
+ }
+ index->fd = stream->index_fd;
+ index->index_data.offset = data_offset;
+
+ if (index_created) {
+ /*
+ * Try to add the relay index object to the hash table. If an object
+ * already exist, destroy back the index created and set the data.
+ */
+ relay_index_add(index, indexes_ht, &wr_index);
+ if (wr_index) {
+ /* Copy back data from the created index. */
+ wr_index->fd = index->fd;
+ wr_index->to_close_fd = index->to_close_fd;
+ wr_index->index_data.offset = data_offset;
+ free(index);
+ }
+ } else {
+ /* The index already exists so write it on disk. */
+ wr_index = index;
+ }
+
+ /* Do we have a writable ready index to write on disk. */
+ if (wr_index) {
+ /* Starting at 2.4, create the index file if none available. */
+ if (cmd->minor >= 4 && stream->index_fd < 0) {
+ ret = index_create_file(stream->path_name, stream->channel_name,
+ relayd_uid, relayd_gid, stream->tracefile_size,
+ stream->tracefile_count_current);
+ if (ret < 0) {
+ goto end_rcu_unlock;
+ }
+ stream->index_fd = ret;
+ }
+
+ ret = relay_index_write(wr_index->fd, wr_index, indexes_ht);
+ if (ret < 0) {
+ goto end_rcu_unlock;
+ }
}
do {
if (ret < 0 || ret != data_size) {
ERR("Relay error writing data to file");
ret = -1;
- goto end_unlock;
+ goto end_rcu_unlock;
}
DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64,
ret = write_padding_to_file(stream->fd, be32toh(data_hdr.padding_size));
if (ret < 0) {
- goto end_unlock;
+ goto end_rcu_unlock;
}
+ stream->tracefile_size_current += data_size + be32toh(data_hdr.padding_size);
stream->prev_seq = net_seq_num;
if (cret < 0) {
PERROR("close stream process data");
}
+
+ cret = close(stream->index_fd);
+ if (cret < 0) {
+ PERROR("close stream index_fd");
+ }
iter.iter.node = &stream->stream_n.node;
ret = lttng_ht_del(streams_ht, &iter);
assert(!ret);
DBG("Closed tracefile %d after recv data", stream->fd);
}
-end_unlock:
+end_rcu_unlock:
rcu_read_unlock();
end:
return ret;
struct lttng_ht_node_ulong *node;
struct lttng_ht_iter iter;
struct lttng_ht *streams_ht;
+ struct lttng_ht *index_streams_ht;
struct lttcomm_relayd_hdr recv_hdr;
DBG("[thread] Relay worker started");
goto streams_ht_error;
}
+ /* Tables of received indexes indexed by index handle and net_seq_num. */
+ indexes_ht = lttng_ht_new(0, LTTNG_HT_TYPE_TWO_U64);
+ if (!indexes_ht) {
+ goto indexes_ht_error;
+ }
+
ret = create_thread_poll_set(&events, 2);
if (ret < 0) {
goto error_poll_create;
}
ret = relay_process_control(&recv_hdr,
relay_connection,
- streams_ht);
+ streams_ht,
+ index_streams_ht,
+ indexes_ht);
if (ret < 0) {
/* Clear the session on error. */
relay_cleanup_poll_connection(&events, pollfd);
continue;
}
- ret = relay_process_data(relay_connection, streams_ht);
+ ret = relay_process_data(relay_connection, streams_ht,
+ indexes_ht);
/* connection closed */
if (ret < 0) {
relay_cleanup_poll_connection(&events, pollfd);
}
rcu_read_unlock();
error_poll_create:
+ lttng_ht_destroy(indexes_ht);
+indexes_ht_error:
lttng_ht_destroy(streams_ht);
streams_ht_error:
lttng_ht_destroy(relay_connections_ht);
/* Try to create directory if -o, --output is specified. */
if (opt_output_path) {
+ if (*opt_output_path != '/') {
+ ERR("Please specify an absolute path for -o, --output PATH");
+ goto exit;
+ }
+
ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG);
if (ret < 0) {
ERR("Unable to create %s", opt_output_path);
}
}
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
+ /* We need those values for the file/dir creation. */
+ relayd_uid = getuid();
+ relayd_gid = getgid();
- if (!is_root) {
+ /* Check if daemon is UID = 0 */
+ if (relayd_uid == 0) {
if (control_uri->port < 1024 || data_uri->port < 1024) {
ERR("Need to be root to use ports < 1024");
ret = -1;
/* Set up max poll set size */
lttng_poll_set_max_size();
+ /* Initialize communication library */
+ lttcomm_init();
+
/* Setup the dispatcher thread */
ret = pthread_create(&dispatcher_thread, NULL,
relay_thread_dispatcher, (void *) NULL);