2 * Copyright (C) 2012 Julien Desfossez <jdesfossez@efficios.com>
3 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
4 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * SPDX-License-Identifier: GPL-2.0-only
21 #include <sys/mount.h>
22 #include <sys/resource.h>
23 #include <sys/socket.h>
25 #include <sys/types.h>
27 #include <sys/resource.h>
29 #include <urcu/futex.h>
30 #include <urcu/uatomic.h>
31 #include <urcu/rculist.h>
37 #include <lttng/lttng.h>
38 #include <common/common.h>
39 #include <common/compat/poll.h>
40 #include <common/compat/socket.h>
41 #include <common/compat/endian.h>
42 #include <common/compat/getenv.h>
43 #include <common/defaults.h>
44 #include <common/daemonize.h>
45 #include <common/futex.h>
46 #include <common/sessiond-comm/sessiond-comm.h>
47 #include <common/sessiond-comm/inet.h>
48 #include <common/sessiond-comm/relayd.h>
49 #include <common/uri.h>
50 #include <common/utils.h>
51 #include <common/align.h>
52 #include <common/config/session-config.h>
53 #include <common/dynamic-buffer.h>
54 #include <common/buffer-view.h>
55 #include <common/string-utils/format.h>
56 #include <common/fd-tracker/fd-tracker.h>
57 #include <common/fd-tracker/utils.h>
59 #include "backward-compatibility-group-by.h"
61 #include "connection.h"
62 #include "ctf-trace.h"
63 #include "health-relayd.h"
66 #include "lttng-relayd.h"
68 #include "sessiond-trace-chunks.h"
70 #include "tcp_keep_alive.h"
71 #include "testpoint.h"
72 #include "tracefile-array.h"
75 #include "viewer-stream.h"
77 static const char *help_msg
=
78 #ifdef LTTNG_EMBED_HELP
79 #include <lttng-relayd.8.h>
85 enum relay_connection_status
{
86 RELAY_CONNECTION_STATUS_OK
,
87 /* An error occurred while processing an event on the connection. */
88 RELAY_CONNECTION_STATUS_ERROR
,
89 /* Connection closed/shutdown cleanly. */
90 RELAY_CONNECTION_STATUS_CLOSED
,
93 /* command line options */
94 char *opt_output_path
, *opt_working_directory
;
95 static int opt_daemon
, opt_background
, opt_print_version
, opt_allow_clear
= 1;
96 enum relay_group_output_by opt_group_output_by
= RELAYD_GROUP_OUTPUT_BY_UNKNOWN
;
99 * We need to wait for listener and live listener threads, as well as
100 * health check thread, before being ready to signal readiness.
102 #define NR_LTTNG_RELAY_READY 3
103 static int lttng_relay_ready
= NR_LTTNG_RELAY_READY
;
105 /* Size of receive buffer. */
106 #define RECV_DATA_BUFFER_SIZE 65536
108 static int recv_child_signal
; /* Set to 1 when a SIGUSR1 signal is received. */
109 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
111 static struct lttng_uri
*control_uri
;
112 static struct lttng_uri
*data_uri
;
113 static struct lttng_uri
*live_uri
;
115 const char *progname
;
117 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
118 static int tracing_group_name_override
;
120 const char * const config_section_name
= "relayd";
123 * Quit pipe for all threads. This permits a single cancellation point
124 * for all threads when receiving an event on the pipe.
126 int thread_quit_pipe
[2] = { -1, -1 };
129 * This pipe is used to inform the worker thread that a command is queued and
130 * ready to be processed.
132 static int relay_conn_pipe
[2] = { -1, -1 };
134 /* Shared between threads */
135 static int dispatch_thread_exit
;
137 static pthread_t listener_thread
;
138 static pthread_t dispatcher_thread
;
139 static pthread_t worker_thread
;
140 static pthread_t health_thread
;
143 * last_relay_stream_id_lock protects last_relay_stream_id increment
144 * atomicity on 32-bit architectures.
146 static pthread_mutex_t last_relay_stream_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
147 static uint64_t last_relay_stream_id
;
150 * Relay command queue.
152 * The relay_thread_listener and relay_thread_dispatcher communicate with this
155 static struct relay_conn_queue relay_conn_queue
;
157 /* Cap of file desriptors to be in simultaneous use by the relay daemon. */
158 static unsigned int lttng_opt_fd_pool_size
= -1;
160 /* Global relay stream hash table. */
161 struct lttng_ht
*relay_streams_ht
;
163 /* Global relay viewer stream hash table. */
164 struct lttng_ht
*viewer_streams_ht
;
166 /* Global relay sessions hash table. */
167 struct lttng_ht
*sessions_ht
;
169 /* Relayd health monitoring */
170 struct health_app
*health_relayd
;
172 struct sessiond_trace_chunk_registry
*sessiond_trace_chunk_registry
;
174 /* Global fd tracker. */
175 struct fd_tracker
*the_fd_tracker
;
177 static struct option long_options
[] = {
178 { "control-port", 1, 0, 'C', },
179 { "data-port", 1, 0, 'D', },
180 { "live-port", 1, 0, 'L', },
181 { "daemonize", 0, 0, 'd', },
182 { "background", 0, 0, 'b', },
183 { "group", 1, 0, 'g', },
184 { "fd-pool-size", 1, 0, '\0', },
185 { "help", 0, 0, 'h', },
186 { "output", 1, 0, 'o', },
187 { "verbose", 0, 0, 'v', },
188 { "config", 1, 0, 'f' },
189 { "version", 0, 0, 'V' },
190 { "working-directory", 1, 0, 'w', },
191 { "group-output-by-session", 0, 0, 's', },
192 { "group-output-by-host", 0, 0, 'p', },
193 { "disallow-clear", 0, 0, 'x' },
197 static const char *config_ignore_options
[] = { "help", "config", "version" };
199 static void print_version(void) {
200 fprintf(stdout
, "%s\n", VERSION
);
203 static void relayd_config_log(void)
205 DBG("LTTng-relayd " VERSION
" - " VERSION_NAME
"%s%s",
206 GIT_VERSION
[0] == '\0' ? "" : " - " GIT_VERSION
,
207 EXTRA_VERSION_NAME
[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME
);
208 if (EXTRA_VERSION_DESCRIPTION
[0] != '\0') {
209 DBG("LTTng-relayd extra version description:\n\t" EXTRA_VERSION_DESCRIPTION
"\n");
211 if (EXTRA_VERSION_PATCHES
[0] != '\0') {
212 DBG("LTTng-relayd extra patches:\n\t" EXTRA_VERSION_PATCHES
"\n");
217 * Take an option from the getopt output and set it in the right variable to be
220 * Return 0 on success else a negative value.
222 static int set_option(int opt
, const char *arg
, const char *optname
)
228 if (!strcmp(optname
, "fd-pool-size")) {
232 v
= strtoul(arg
, NULL
, 0);
233 if (errno
!= 0 || !isdigit((unsigned char) arg
[0])) {
234 ERR("Wrong value in --fd-pool-size parameter: %s", arg
);
239 ERR("File descriptor cap overflow in --fd-pool-size parameter: %s", arg
);
243 lttng_opt_fd_pool_size
= (unsigned int) v
;
245 fprintf(stderr
, "unknown option %s", optname
);
247 fprintf(stderr
, " with arg %s\n", arg
);
252 if (lttng_is_setuid_setgid()) {
253 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
254 "-C, --control-port");
256 ret
= uri_parse(arg
, &control_uri
);
258 ERR("Invalid control URI specified");
261 if (control_uri
->port
== 0) {
262 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
267 if (lttng_is_setuid_setgid()) {
268 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
271 ret
= uri_parse(arg
, &data_uri
);
273 ERR("Invalid data URI specified");
276 if (data_uri
->port
== 0) {
277 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
282 if (lttng_is_setuid_setgid()) {
283 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
286 ret
= uri_parse(arg
, &live_uri
);
288 ERR("Invalid live URI specified");
291 if (live_uri
->port
== 0) {
292 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
303 if (lttng_is_setuid_setgid()) {
304 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
307 tracing_group_name
= strdup(arg
);
308 if (tracing_group_name
== NULL
) {
313 tracing_group_name_override
= 1;
317 ret
= utils_show_help(8, "lttng-relayd", help_msg
);
319 ERR("Cannot show --help for `lttng-relayd`");
324 opt_print_version
= 1;
327 if (lttng_is_setuid_setgid()) {
328 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
331 ret
= asprintf(&opt_output_path
, "%s", arg
);
334 PERROR("asprintf opt_output_path");
340 if (lttng_is_setuid_setgid()) {
341 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
342 "-w, --working-directory");
344 ret
= asprintf(&opt_working_directory
, "%s", arg
);
347 PERROR("asprintf opt_working_directory");
354 /* Verbose level can increase using multiple -v */
356 lttng_opt_verbose
= config_parse_value(arg
);
358 /* Only 3 level of verbosity (-vvv). */
359 if (lttng_opt_verbose
< 3) {
360 lttng_opt_verbose
+= 1;
365 if (opt_group_output_by
!= RELAYD_GROUP_OUTPUT_BY_UNKNOWN
) {
366 ERR("Cannot set --group-output-by-session, another --group-output-by argument is present");
369 opt_group_output_by
= RELAYD_GROUP_OUTPUT_BY_SESSION
;
372 if (opt_group_output_by
!= RELAYD_GROUP_OUTPUT_BY_UNKNOWN
) {
373 ERR("Cannot set --group-output-by-host, another --group-output-by argument is present");
376 opt_group_output_by
= RELAYD_GROUP_OUTPUT_BY_HOST
;
383 /* Unknown option or other error.
384 * Error is printed by getopt, just return */
397 * config_entry_handler_cb used to handle options read from a config file.
398 * See config_entry_handler_cb comment in common/config/session-config.h for the
399 * return value conventions.
401 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
405 if (!entry
|| !entry
->name
|| !entry
->value
) {
410 /* Check if the option is to be ignored */
411 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
412 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
417 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1; i
++) {
418 /* Ignore if entry name is not fully matched. */
419 if (strcmp(entry
->name
, long_options
[i
].name
)) {
424 * If the option takes no argument on the command line,
425 * we have to check if the value is "true". We support
426 * non-zero numeric values, true, on and yes.
428 if (!long_options
[i
].has_arg
) {
429 ret
= config_parse_value(entry
->value
);
432 WARN("Invalid configuration value \"%s\" for option %s",
433 entry
->value
, entry
->name
);
435 /* False, skip boolean config option. */
440 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
444 WARN("Unrecognized option \"%s\" in daemon configuration file.",
451 static int parse_env_options(void)
456 value
= lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_WORKING_DIRECTORY_ENV
);
458 opt_working_directory
= strdup(value
);
459 if (!opt_working_directory
) {
460 ERR("Failed to allocate working directory string (\"%s\")",
468 static int set_fd_pool_size(void)
471 struct rlimit rlimit
;
473 ret
= getrlimit(RLIMIT_NOFILE
, &rlimit
);
475 PERROR("Failed to get file descriptor limit");
480 DBG("File descriptor count limits are %" PRIu64
" (soft) and %" PRIu64
" (hard)",
481 (uint64_t) rlimit
.rlim_cur
,
482 (uint64_t) rlimit
.rlim_max
);
483 if (lttng_opt_fd_pool_size
== -1) {
484 /* Use default value (soft limit - reserve). */
485 if (rlimit
.rlim_cur
< DEFAULT_RELAYD_MIN_FD_POOL_SIZE
) {
486 ERR("The process' file number limit is too low (%" PRIu64
"). The process' file number limit must be set to at least %i.",
487 (uint64_t) rlimit
.rlim_cur
, DEFAULT_RELAYD_MIN_FD_POOL_SIZE
);
491 lttng_opt_fd_pool_size
= rlimit
.rlim_cur
-
492 DEFAULT_RELAYD_FD_POOL_SIZE_RESERVE
;
496 if (lttng_opt_fd_pool_size
< DEFAULT_RELAYD_MIN_FD_POOL_SIZE
) {
497 ERR("File descriptor pool size must be set to at least %d",
498 DEFAULT_RELAYD_MIN_FD_POOL_SIZE
);
503 if (lttng_opt_fd_pool_size
> rlimit
.rlim_cur
) {
504 ERR("File descriptor pool size argument (%u) exceeds the process' soft limit (%" PRIu64
").",
505 lttng_opt_fd_pool_size
, (uint64_t) rlimit
.rlim_cur
);
510 DBG("File descriptor pool size argument (%u) adjusted to %u to accommodates transient fd uses",
511 lttng_opt_fd_pool_size
,
512 lttng_opt_fd_pool_size
- DEFAULT_RELAYD_FD_POOL_SIZE_RESERVE
);
513 lttng_opt_fd_pool_size
-= DEFAULT_RELAYD_FD_POOL_SIZE_RESERVE
;
518 static int set_options(int argc
, char **argv
)
520 int c
, ret
= 0, option_index
= 0, retval
= 0;
521 int orig_optopt
= optopt
, orig_optind
= optind
;
522 char *default_address
, *optstring
;
523 char *config_path
= NULL
;
525 optstring
= utils_generate_optstring(long_options
,
526 sizeof(long_options
) / sizeof(struct option
));
532 /* Check for the --config option */
534 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
535 &option_index
)) != -1) {
539 } else if (c
!= 'f') {
543 if (lttng_is_setuid_setgid()) {
544 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
548 config_path
= utils_expand_path(optarg
);
550 ERR("Failed to resolve path: %s", optarg
);
555 ret
= config_get_section_entries(config_path
, config_section_name
,
556 config_entry_handler
, NULL
);
559 ERR("Invalid configuration option at line %i", ret
);
565 /* Reset getopt's global state */
566 optopt
= orig_optopt
;
567 optind
= orig_optind
;
569 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
574 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
581 /* assign default values */
582 if (control_uri
== NULL
) {
583 ret
= asprintf(&default_address
,
584 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS
":%d",
585 DEFAULT_NETWORK_CONTROL_PORT
);
587 PERROR("asprintf default data address");
592 ret
= uri_parse(default_address
, &control_uri
);
593 free(default_address
);
595 ERR("Invalid control URI specified");
600 if (data_uri
== NULL
) {
601 ret
= asprintf(&default_address
,
602 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS
":%d",
603 DEFAULT_NETWORK_DATA_PORT
);
605 PERROR("asprintf default data address");
610 ret
= uri_parse(default_address
, &data_uri
);
611 free(default_address
);
613 ERR("Invalid data URI specified");
618 if (live_uri
== NULL
) {
619 ret
= asprintf(&default_address
,
620 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS
":%d",
621 DEFAULT_NETWORK_VIEWER_PORT
);
623 PERROR("asprintf default viewer control address");
628 ret
= uri_parse(default_address
, &live_uri
);
629 free(default_address
);
631 ERR("Invalid viewer control URI specified");
636 ret
= set_fd_pool_size();
642 if (opt_group_output_by
== RELAYD_GROUP_OUTPUT_BY_UNKNOWN
) {
643 opt_group_output_by
= RELAYD_GROUP_OUTPUT_BY_HOST
;
645 if (opt_allow_clear
) {
646 /* Check if env variable exists. */
647 const char *value
= lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV
);
649 ret
= config_parse_value(value
);
651 ERR("Invalid value for %s specified", DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV
);
655 opt_allow_clear
= !ret
;
665 static void print_global_objects(void)
667 print_viewer_streams();
668 print_relay_streams();
672 static int noop_close(void *data
, int *fds
)
677 static void untrack_stdio(void)
679 int fds
[] = { fileno(stdout
), fileno(stderr
) };
682 * noop_close is used since we don't really want to close
683 * the stdio output fds; we merely want to stop tracking them.
685 (void) fd_tracker_close_unsuspendable_fd(the_fd_tracker
,
686 fds
, 2, noop_close
, NULL
);
692 static void relayd_cleanup(void)
694 print_global_objects();
698 if (viewer_streams_ht
)
699 lttng_ht_destroy(viewer_streams_ht
);
700 if (relay_streams_ht
)
701 lttng_ht_destroy(relay_streams_ht
);
703 lttng_ht_destroy(sessions_ht
);
705 free(opt_output_path
);
706 free(opt_working_directory
);
709 health_app_destroy(health_relayd
);
711 /* Close thread quit pipes */
712 if (health_quit_pipe
[0] != -1) {
713 (void) fd_tracker_util_pipe_close(
714 the_fd_tracker
, health_quit_pipe
);
716 if (thread_quit_pipe
[0] != -1) {
717 (void) fd_tracker_util_pipe_close(
718 the_fd_tracker
, thread_quit_pipe
);
720 if (sessiond_trace_chunk_registry
) {
721 sessiond_trace_chunk_registry_destroy(
722 sessiond_trace_chunk_registry
);
724 if (the_fd_tracker
) {
727 * fd_tracker_destroy() will log the contents of the fd-tracker
728 * if a leak is detected.
730 fd_tracker_destroy(the_fd_tracker
);
733 uri_free(control_uri
);
735 /* Live URI is freed in the live thread. */
737 if (tracing_group_name_override
) {
738 free((void *) tracing_group_name
);
743 * Write to writable pipe used to notify a thread.
745 static int notify_thread_pipe(int wpipe
)
749 ret
= lttng_write(wpipe
, "!", 1);
751 PERROR("write poll pipe");
759 static int notify_health_quit_pipe(int *pipe
)
763 ret
= lttng_write(pipe
[1], "4", 1);
765 PERROR("write relay health quit");
774 * Stop all relayd and relayd-live threads.
776 int lttng_relay_stop_threads(void)
780 /* Stopping all threads */
781 DBG("Terminating all threads");
782 if (notify_thread_pipe(thread_quit_pipe
[1])) {
783 ERR("write error on thread quit pipe");
787 if (notify_health_quit_pipe(health_quit_pipe
)) {
788 ERR("write error on health quit pipe");
791 /* Dispatch thread */
792 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
793 futex_nto1_wake(&relay_conn_queue
.futex
);
795 if (relayd_live_stop()) {
796 ERR("Error stopping live threads");
803 * Signal handler for the daemon
805 * Simply stop all worker threads, leaving main() return gracefully after
806 * joining all threads and calling cleanup().
808 static void sighandler(int sig
)
812 DBG("SIGINT caught");
813 if (lttng_relay_stop_threads()) {
814 ERR("Error stopping threads");
818 DBG("SIGTERM caught");
819 if (lttng_relay_stop_threads()) {
820 ERR("Error stopping threads");
824 CMM_STORE_SHARED(recv_child_signal
, 1);
832 * Setup signal handler for :
833 * SIGINT, SIGTERM, SIGPIPE
835 static int set_signal_handler(void)
841 if ((ret
= sigemptyset(&sigset
)) < 0) {
842 PERROR("sigemptyset");
849 sa
.sa_handler
= sighandler
;
850 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
855 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
860 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
865 sa
.sa_handler
= SIG_IGN
;
866 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
871 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
876 void lttng_relay_notify_ready(void)
878 /* Notify the parent of the fork() process that we are ready. */
879 if (opt_daemon
|| opt_background
) {
880 if (uatomic_sub_return(<tng_relay_ready
, 1) == 0) {
881 kill(child_ppid
, SIGUSR1
);
887 * Init thread quit pipe.
889 * Return -1 on error or 0 if all pipes are created.
891 static int init_thread_quit_pipe(void)
893 return fd_tracker_util_pipe_open_cloexec(
894 the_fd_tracker
, "Quit pipe", thread_quit_pipe
);
898 * Init health quit pipe.
900 * Return -1 on error or 0 if all pipes are created.
902 static int init_health_quit_pipe(void)
904 return fd_tracker_util_pipe_open_cloexec(the_fd_tracker
,
905 "Health quit pipe", health_quit_pipe
);
909 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
911 static int create_named_thread_poll_set(struct lttng_poll_event
*events
,
912 int size
, const char *name
)
916 if (events
== NULL
|| size
== 0) {
921 ret
= fd_tracker_util_poll_create(the_fd_tracker
,
922 name
, events
, 1, LTTNG_CLOEXEC
);
924 PERROR("Failed to create \"%s\" poll file descriptor", name
);
929 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
941 * Check if the thread quit pipe was triggered.
943 * Return 1 if it was triggered else 0;
945 static int check_thread_quit_pipe(int fd
, uint32_t events
)
947 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
954 static int create_sock(void *data
, int *out_fd
)
957 struct lttcomm_sock
*sock
= data
;
959 ret
= lttcomm_create_sock(sock
);
969 static int close_sock(void *data
, int *in_fd
)
971 struct lttcomm_sock
*sock
= data
;
973 return sock
->ops
->close(sock
);
976 static int accept_sock(void *data
, int *out_fd
)
979 /* Socks is an array of in_sock, out_sock. */
980 struct lttcomm_sock
**socks
= data
;
981 struct lttcomm_sock
*in_sock
= socks
[0];
983 socks
[1] = in_sock
->ops
->accept(in_sock
);
988 *out_fd
= socks
[1]->fd
;
994 * Create and init socket from uri.
996 static struct lttcomm_sock
*relay_socket_create(struct lttng_uri
*uri
,
1000 struct lttcomm_sock
*sock
= NULL
;
1001 char uri_str
[PATH_MAX
];
1002 char *formated_name
= NULL
;
1004 sock
= lttcomm_alloc_sock_from_uri(uri
);
1006 ERR("Allocating socket");
1011 * Don't fail to create the socket if the name can't be built as it is
1012 * only used for debugging purposes.
1014 ret
= uri_to_str_url(uri
, uri_str
, sizeof(uri_str
));
1015 uri_str
[sizeof(uri_str
) - 1] = '\0';
1017 ret
= asprintf(&formated_name
, "%s socket @ %s", name
,
1020 formated_name
= NULL
;
1024 ret
= fd_tracker_open_unsuspendable_fd(the_fd_tracker
, &sock_fd
,
1025 (const char **) (formated_name
? &formated_name
: NULL
),
1026 1, create_sock
, sock
);
1028 PERROR("Failed to open \"%s\" relay socket",
1029 formated_name
?: "Unknown");
1032 DBG("Listening on %s socket %d", name
, sock
->fd
);
1034 ret
= sock
->ops
->bind(sock
);
1036 PERROR("Failed to bind socket");
1040 ret
= sock
->ops
->listen(sock
, -1);
1046 free(formated_name
);
1051 lttcomm_destroy_sock(sock
);
1053 free(formated_name
);
1058 struct lttcomm_sock
*accept_relayd_sock(struct lttcomm_sock
*listening_sock
,
1062 struct lttcomm_sock
*socks
[2] = { listening_sock
, NULL
};
1063 struct lttcomm_sock
*new_sock
= NULL
;
1065 ret
= fd_tracker_open_unsuspendable_fd(
1066 the_fd_tracker
, &out_fd
,
1067 (const char **) &name
,
1068 1, accept_sock
, &socks
);
1072 new_sock
= socks
[1];
1073 DBG("%s accepted, socket %d", name
, new_sock
->fd
);
1079 * This thread manages the listening for new connections on the network
1081 static void *relay_thread_listener(void *data
)
1083 int i
, ret
, pollfd
, err
= -1;
1084 uint32_t revents
, nb_fd
;
1085 struct lttng_poll_event events
;
1086 struct lttcomm_sock
*control_sock
, *data_sock
;
1088 DBG("[thread] Relay listener started");
1090 rcu_register_thread();
1091 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
1093 health_code_update();
1095 control_sock
= relay_socket_create(control_uri
, "Control listener");
1096 if (!control_sock
) {
1097 goto error_sock_control
;
1100 data_sock
= relay_socket_create(data_uri
, "Data listener");
1102 goto error_sock_relay
;
1106 * Pass 3 as size here for the thread quit pipe, control and
1109 ret
= create_named_thread_poll_set(&events
, 3, "Listener thread epoll");
1111 goto error_create_poll
;
1114 /* Add the control socket */
1115 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
1117 goto error_poll_add
;
1120 /* Add the data socket */
1121 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
1123 goto error_poll_add
;
1126 lttng_relay_notify_ready();
1128 if (testpoint(relayd_thread_listener
)) {
1129 goto error_testpoint
;
1133 health_code_update();
1135 DBG("Listener accepting connections");
1138 health_poll_entry();
1139 ret
= lttng_poll_wait(&events
, -1);
1143 * Restart interrupted system call.
1145 if (errno
== EINTR
) {
1153 DBG("Relay new connection received");
1154 for (i
= 0; i
< nb_fd
; i
++) {
1155 health_code_update();
1157 /* Fetch once the poll data */
1158 revents
= LTTNG_POLL_GETEV(&events
, i
);
1159 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1161 /* Thread quit pipe has been closed. Killing thread. */
1162 ret
= check_thread_quit_pipe(pollfd
, revents
);
1168 if (revents
& LPOLLIN
) {
1170 * A new connection is requested, therefore a
1171 * sessiond/consumerd connection is allocated in
1172 * this thread, enqueued to a global queue and
1173 * dequeued (and freed) in the worker thread.
1176 struct relay_connection
*new_conn
;
1177 struct lttcomm_sock
*newsock
= NULL
;
1178 enum connection_type type
;
1180 if (pollfd
== data_sock
->fd
) {
1182 newsock
= accept_relayd_sock(data_sock
,
1183 "Data socket to relayd");
1185 assert(pollfd
== control_sock
->fd
);
1186 type
= RELAY_CONTROL
;
1187 newsock
= accept_relayd_sock(control_sock
,
1188 "Control socket to relayd");
1191 PERROR("accepting sock");
1195 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
1198 PERROR("setsockopt inet");
1199 lttcomm_destroy_sock(newsock
);
1203 ret
= socket_apply_keep_alive_config(newsock
->fd
);
1205 ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
1207 lttcomm_destroy_sock(newsock
);
1211 new_conn
= connection_create(newsock
, type
);
1213 lttcomm_destroy_sock(newsock
);
1217 /* Enqueue request for the dispatcher thread. */
1218 cds_wfcq_enqueue(&relay_conn_queue
.head
, &relay_conn_queue
.tail
,
1222 * Wake the dispatch queue futex.
1223 * Implicit memory barrier with the
1224 * exchange in cds_wfcq_enqueue.
1226 futex_nto1_wake(&relay_conn_queue
.futex
);
1227 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1228 ERR("socket poll error");
1231 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1241 (void) fd_tracker_util_poll_clean(the_fd_tracker
, &events
);
1243 if (data_sock
->fd
>= 0) {
1244 int data_sock_fd
= data_sock
->fd
;
1246 ret
= fd_tracker_close_unsuspendable_fd(the_fd_tracker
,
1247 &data_sock_fd
, 1, close_sock
,
1250 PERROR("Failed to close the data listener socket file descriptor");
1254 lttcomm_destroy_sock(data_sock
);
1256 if (control_sock
->fd
>= 0) {
1257 int control_sock_fd
= control_sock
->fd
;
1259 ret
= fd_tracker_close_unsuspendable_fd(the_fd_tracker
,
1260 &control_sock_fd
, 1, close_sock
,
1263 PERROR("Failed to close the control listener socket file descriptor");
1265 control_sock
->fd
= -1;
1267 lttcomm_destroy_sock(control_sock
);
1271 ERR("Health error occurred in %s", __func__
);
1273 health_unregister(health_relayd
);
1274 rcu_unregister_thread();
1275 DBG("Relay listener thread cleanup complete");
1276 lttng_relay_stop_threads();
1281 * This thread manages the dispatching of the requests to worker threads
1283 static void *relay_thread_dispatcher(void *data
)
1287 struct cds_wfcq_node
*node
;
1288 struct relay_connection
*new_conn
= NULL
;
1290 DBG("[thread] Relay dispatcher started");
1292 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
1294 if (testpoint(relayd_thread_dispatcher
)) {
1295 goto error_testpoint
;
1298 health_code_update();
1301 health_code_update();
1303 /* Atomically prepare the queue futex */
1304 futex_nto1_prepare(&relay_conn_queue
.futex
);
1306 if (CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1311 health_code_update();
1313 /* Dequeue commands */
1314 node
= cds_wfcq_dequeue_blocking(&relay_conn_queue
.head
,
1315 &relay_conn_queue
.tail
);
1317 DBG("Woken up but nothing in the relay command queue");
1318 /* Continue thread execution */
1321 new_conn
= caa_container_of(node
, struct relay_connection
, qnode
);
1323 DBG("Dispatching request waiting on sock %d", new_conn
->sock
->fd
);
1326 * Inform worker thread of the new request. This
1327 * call is blocking so we can be assured that
1328 * the data will be read at some point in time
1329 * or wait to the end of the world :)
1331 ret
= lttng_write(relay_conn_pipe
[1], &new_conn
, sizeof(new_conn
));
1333 PERROR("write connection pipe");
1334 connection_put(new_conn
);
1337 } while (node
!= NULL
);
1339 /* Futex wait on queue. Blocking call on futex() */
1340 health_poll_entry();
1341 futex_nto1_wait(&relay_conn_queue
.futex
);
1345 /* Normal exit, no error */
1352 ERR("Health error occurred in %s", __func__
);
1354 health_unregister(health_relayd
);
1355 DBG("Dispatch thread dying");
1356 lttng_relay_stop_threads();
1360 static bool session_streams_have_index(const struct relay_session
*session
)
1362 return session
->minor
>= 4 && !session
->snapshot
;
1366 * Handle the RELAYD_CREATE_SESSION command.
1368 * On success, send back the session id or else return a negative value.
1370 static int relay_create_session(const struct lttcomm_relayd_hdr
*recv_hdr
,
1371 struct relay_connection
*conn
,
1372 const struct lttng_buffer_view
*payload
)
1376 struct relay_session
*session
= NULL
;
1377 struct lttcomm_relayd_create_session_reply_2_11 reply
= {};
1378 char session_name
[LTTNG_NAME_MAX
] = {};
1379 char hostname
[LTTNG_HOST_NAME_MAX
] = {};
1380 uint32_t live_timer
= 0;
1381 bool snapshot
= false;
1382 bool session_name_contains_creation_timestamp
= false;
1383 /* Left nil for peers < 2.11. */
1384 char base_path
[LTTNG_PATH_MAX
] = {};
1385 lttng_uuid sessiond_uuid
= {};
1386 LTTNG_OPTIONAL(uint64_t) id_sessiond
= {};
1387 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
1388 LTTNG_OPTIONAL(time_t) creation_time
= {};
1389 struct lttng_dynamic_buffer reply_payload
;
1391 lttng_dynamic_buffer_init(&reply_payload
);
1393 if (conn
->minor
< 4) {
1394 /* From 2.1 to 2.3 */
1396 } else if (conn
->minor
>= 4 && conn
->minor
< 11) {
1397 /* From 2.4 to 2.10 */
1398 ret
= cmd_create_session_2_4(payload
, session_name
,
1399 hostname
, &live_timer
, &snapshot
);
1401 bool has_current_chunk
;
1402 uint64_t current_chunk_id_value
;
1403 time_t creation_time_value
;
1404 uint64_t id_sessiond_value
;
1406 /* From 2.11 to ... */
1407 ret
= cmd_create_session_2_11(payload
, session_name
, hostname
,
1408 base_path
, &live_timer
, &snapshot
, &id_sessiond_value
,
1409 sessiond_uuid
, &has_current_chunk
,
1410 ¤t_chunk_id_value
, &creation_time_value
,
1411 &session_name_contains_creation_timestamp
);
1412 if (lttng_uuid_is_nil(sessiond_uuid
)) {
1413 /* The nil UUID is reserved for pre-2.11 clients. */
1414 ERR("Illegal nil UUID announced by peer in create session command");
1418 LTTNG_OPTIONAL_SET(&id_sessiond
, id_sessiond_value
);
1419 LTTNG_OPTIONAL_SET(&creation_time
, creation_time_value
);
1420 if (has_current_chunk
) {
1421 LTTNG_OPTIONAL_SET(¤t_chunk_id
,
1422 current_chunk_id_value
);
1430 session
= session_create(session_name
, hostname
, base_path
, live_timer
,
1431 snapshot
, sessiond_uuid
,
1432 id_sessiond
.is_set
? &id_sessiond
.value
: NULL
,
1433 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1434 creation_time
.is_set
? &creation_time
.value
: NULL
,
1435 conn
->major
, conn
->minor
,
1436 session_name_contains_creation_timestamp
);
1441 assert(!conn
->session
);
1442 conn
->session
= session
;
1443 DBG("Created session %" PRIu64
, session
->id
);
1445 reply
.generic
.session_id
= htobe64(session
->id
);
1449 reply
.generic
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1451 reply
.generic
.ret_code
= htobe32(LTTNG_OK
);
1454 if (conn
->minor
< 11) {
1455 /* From 2.1 to 2.10 */
1456 ret
= lttng_dynamic_buffer_append(&reply_payload
,
1457 &reply
.generic
, sizeof(reply
.generic
));
1459 ERR("Failed to append \"create session\" command reply header to payload buffer");
1464 const uint32_t output_path_length
=
1465 session
? strlen(session
->output_path
) + 1 : 0;
1467 reply
.output_path_length
= htobe32(output_path_length
);
1468 ret
= lttng_dynamic_buffer_append(
1469 &reply_payload
, &reply
, sizeof(reply
));
1471 ERR("Failed to append \"create session\" command reply header to payload buffer");
1475 if (output_path_length
) {
1476 ret
= lttng_dynamic_buffer_append(&reply_payload
,
1477 session
->output_path
,
1478 output_path_length
);
1480 ERR("Failed to append \"create session\" command reply path to payload buffer");
1486 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, reply_payload
.data
,
1487 reply_payload
.size
, 0);
1488 if (send_ret
< (ssize_t
) reply_payload
.size
) {
1489 ERR("Failed to send \"create session\" command reply of %zu bytes (ret = %zd)",
1490 reply_payload
.size
, send_ret
);
1494 if (ret
< 0 && session
) {
1495 session_put(session
);
1497 lttng_dynamic_buffer_reset(&reply_payload
);
1502 * When we have received all the streams and the metadata for a channel,
1503 * we make them visible to the viewer threads.
1505 static void publish_connection_local_streams(struct relay_connection
*conn
)
1507 struct relay_stream
*stream
;
1508 struct relay_session
*session
= conn
->session
;
1511 * We publish all streams belonging to a session atomically wrt
1514 pthread_mutex_lock(&session
->lock
);
1516 cds_list_for_each_entry_rcu(stream
, &session
->recv_list
,
1518 stream_publish(stream
);
1523 * Inform the viewer that there are new streams in the session.
1525 if (session
->viewer_attached
) {
1526 uatomic_set(&session
->new_streams
, 1);
1528 pthread_mutex_unlock(&session
->lock
);
1531 static int conform_channel_path(char *channel_path
)
1535 if (strstr("../", channel_path
)) {
1536 ERR("Refusing channel path as it walks up the path hierarchy: \"%s\"",
1542 if (*channel_path
== '/') {
1543 const size_t len
= strlen(channel_path
);
1546 * Channel paths from peers prior to 2.11 are expressed as an
1547 * absolute path that is, in reality, relative to the relay
1548 * daemon's output directory. Remove the leading slash so it
1549 * is correctly interpreted as a relative path later on.
1551 * len (and not len - 1) is used to copy the trailing NULL.
1553 bcopy(channel_path
+ 1, channel_path
, len
);
1560 * relay_add_stream: allocate a new stream for a session
1562 static int relay_add_stream(const struct lttcomm_relayd_hdr
*recv_hdr
,
1563 struct relay_connection
*conn
,
1564 const struct lttng_buffer_view
*payload
)
1568 struct relay_session
*session
= conn
->session
;
1569 struct relay_stream
*stream
= NULL
;
1570 struct lttcomm_relayd_status_stream reply
;
1571 struct ctf_trace
*trace
= NULL
;
1572 uint64_t stream_handle
= -1ULL;
1573 char *path_name
= NULL
, *channel_name
= NULL
;
1574 uint64_t tracefile_size
= 0, tracefile_count
= 0;
1575 LTTNG_OPTIONAL(uint64_t) stream_chunk_id
= {};
1577 if (!session
|| !conn
->version_check_done
) {
1578 ERR("Trying to add a stream before version check");
1580 goto end_no_session
;
1583 if (session
->minor
== 1) {
1585 ret
= cmd_recv_stream_2_1(payload
, &path_name
,
1587 } else if (session
->minor
> 1 && session
->minor
< 11) {
1588 /* From 2.2 to 2.10 */
1589 ret
= cmd_recv_stream_2_2(payload
, &path_name
,
1590 &channel_name
, &tracefile_size
, &tracefile_count
);
1592 /* From 2.11 to ... */
1593 ret
= cmd_recv_stream_2_11(payload
, &path_name
,
1594 &channel_name
, &tracefile_size
, &tracefile_count
,
1595 &stream_chunk_id
.value
);
1596 stream_chunk_id
.is_set
= true;
1603 if (conform_channel_path(path_name
)) {
1608 * Backward compatibility for --group-output-by-session.
1609 * Prior to lttng 2.11, the complete path is passed by the stream.
1610 * Starting at 2.11, lttng-relayd uses chunk. When dealing with producer
1611 * >=2.11 the chunk is responsible for the output path. When dealing
1612 * with producer < 2.11 the chunk output_path is the root output path
1613 * and the stream carries the complete path (path_name).
1614 * To support --group-output-by-session with older producer (<2.11), we
1615 * need to craft the path based on the stream path.
1617 if (opt_group_output_by
== RELAYD_GROUP_OUTPUT_BY_SESSION
) {
1618 if (conn
->minor
< 4) {
1620 * From 2.1 to 2.3, the session_name is not passed on
1621 * the RELAYD_CREATE_SESSION command. The session name
1622 * is necessary to detect the presence of a base_path
1623 * inside the stream path. Without it we cannot perform
1624 * a valid group-output-by-session transformation.
1626 WARN("Unable to perform a --group-by-session transformation for session %" PRIu64
1627 " for stream with path \"%s\" as it is produced by a peer using a protocol older than v2.4",
1628 session
->id
, path_name
);
1629 } else if (conn
->minor
>= 4 && conn
->minor
< 11) {
1630 char *group_by_session_path_name
;
1632 assert(session
->session_name
[0] != '\0');
1634 group_by_session_path_name
=
1635 backward_compat_group_by_session(
1637 session
->session_name
,
1638 session
->creation_time
.value
);
1639 if (!group_by_session_path_name
) {
1640 ERR("Failed to apply group by session to stream of session %" PRIu64
,
1645 DBG("Transformed session path from \"%s\" to \"%s\" to honor per-session name grouping",
1646 path_name
, group_by_session_path_name
);
1649 path_name
= group_by_session_path_name
;
1653 trace
= ctf_trace_get_by_path_or_create(session
, path_name
);
1658 /* This stream here has one reference on the trace. */
1659 pthread_mutex_lock(&last_relay_stream_id_lock
);
1660 stream_handle
= ++last_relay_stream_id
;
1661 pthread_mutex_unlock(&last_relay_stream_id_lock
);
1663 /* We pass ownership of path_name and channel_name. */
1664 stream
= stream_create(trace
, stream_handle
, path_name
,
1665 channel_name
, tracefile_size
, tracefile_count
);
1667 channel_name
= NULL
;
1670 * Streams are the owners of their trace. Reference to trace is
1671 * kept within stream_create().
1673 ctf_trace_put(trace
);
1676 memset(&reply
, 0, sizeof(reply
));
1677 reply
.handle
= htobe64(stream_handle
);
1679 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1681 reply
.ret_code
= htobe32(LTTNG_OK
);
1684 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1685 sizeof(struct lttcomm_relayd_status_stream
), 0);
1686 if (send_ret
< (ssize_t
) sizeof(reply
)) {
1687 ERR("Failed to send \"add stream\" command reply (ret = %zd)",
1699 * relay_close_stream: close a specific stream
1701 static int relay_close_stream(const struct lttcomm_relayd_hdr
*recv_hdr
,
1702 struct relay_connection
*conn
,
1703 const struct lttng_buffer_view
*payload
)
1707 struct relay_session
*session
= conn
->session
;
1708 struct lttcomm_relayd_close_stream stream_info
;
1709 struct lttcomm_relayd_generic_reply reply
;
1710 struct relay_stream
*stream
;
1712 DBG("Close stream received");
1714 if (!session
|| !conn
->version_check_done
) {
1715 ERR("Trying to close a stream before version check");
1717 goto end_no_session
;
1720 if (payload
->size
< sizeof(stream_info
)) {
1721 ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
1722 sizeof(stream_info
), payload
->size
);
1724 goto end_no_session
;
1726 memcpy(&stream_info
, payload
->data
, sizeof(stream_info
));
1727 stream_info
.stream_id
= be64toh(stream_info
.stream_id
);
1728 stream_info
.last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1730 stream
= stream_get_by_id(stream_info
.stream_id
);
1737 * Set last_net_seq_num before the close flag. Required by data
1740 pthread_mutex_lock(&stream
->lock
);
1741 stream
->last_net_seq_num
= stream_info
.last_net_seq_num
;
1742 pthread_mutex_unlock(&stream
->lock
);
1745 * This is one of the conditions which may trigger a stream close
1746 * with the others being:
1747 * 1) A close command is received for a stream
1748 * 2) The control connection owning the stream is closed
1749 * 3) We have received all of the stream's data _after_ a close
1752 try_stream_close(stream
);
1757 memset(&reply
, 0, sizeof(reply
));
1759 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1761 reply
.ret_code
= htobe32(LTTNG_OK
);
1763 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1764 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1765 if (send_ret
< (ssize_t
) sizeof(reply
)) {
1766 ERR("Failed to send \"close stream\" command reply (ret = %zd)",
1776 * relay_reset_metadata: reset a metadata stream
1779 int relay_reset_metadata(const struct lttcomm_relayd_hdr
*recv_hdr
,
1780 struct relay_connection
*conn
,
1781 const struct lttng_buffer_view
*payload
)
1785 struct relay_session
*session
= conn
->session
;
1786 struct lttcomm_relayd_reset_metadata stream_info
;
1787 struct lttcomm_relayd_generic_reply reply
;
1788 struct relay_stream
*stream
;
1790 DBG("Reset metadata received");
1792 if (!session
|| !conn
->version_check_done
) {
1793 ERR("Trying to reset a metadata stream before version check");
1795 goto end_no_session
;
1798 if (payload
->size
< sizeof(stream_info
)) {
1799 ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
1800 sizeof(stream_info
), payload
->size
);
1802 goto end_no_session
;
1804 memcpy(&stream_info
, payload
->data
, sizeof(stream_info
));
1805 stream_info
.stream_id
= be64toh(stream_info
.stream_id
);
1806 stream_info
.version
= be64toh(stream_info
.version
);
1808 DBG("Update metadata to version %" PRIu64
, stream_info
.version
);
1810 /* Unsupported for live sessions for now. */
1811 if (session
->live_timer
!= 0) {
1816 stream
= stream_get_by_id(stream_info
.stream_id
);
1821 pthread_mutex_lock(&stream
->lock
);
1822 if (!stream
->is_metadata
) {
1827 ret
= stream_reset_file(stream
);
1829 ERR("Failed to reset metadata stream %" PRIu64
1830 ": stream_path = %s, channel = %s",
1831 stream
->stream_handle
, stream
->path_name
,
1832 stream
->channel_name
);
1836 pthread_mutex_unlock(&stream
->lock
);
1840 memset(&reply
, 0, sizeof(reply
));
1842 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1844 reply
.ret_code
= htobe32(LTTNG_OK
);
1846 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1847 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1848 if (send_ret
< (ssize_t
) sizeof(reply
)) {
1849 ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
1859 * relay_unknown_command: send -1 if received unknown command
1861 static void relay_unknown_command(struct relay_connection
*conn
)
1863 struct lttcomm_relayd_generic_reply reply
;
1866 memset(&reply
, 0, sizeof(reply
));
1867 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1868 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1869 if (send_ret
< sizeof(reply
)) {
1870 ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret
);
1875 * relay_start: send an acknowledgment to the client to tell if we are
1876 * ready to receive data. We are ready if a session is established.
1878 static int relay_start(const struct lttcomm_relayd_hdr
*recv_hdr
,
1879 struct relay_connection
*conn
,
1880 const struct lttng_buffer_view
*payload
)
1884 struct lttcomm_relayd_generic_reply reply
;
1885 struct relay_session
*session
= conn
->session
;
1888 DBG("Trying to start the streaming without a session established");
1889 ret
= htobe32(LTTNG_ERR_UNK
);
1892 memset(&reply
, 0, sizeof(reply
));
1893 reply
.ret_code
= htobe32(LTTNG_OK
);
1894 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1896 if (send_ret
< (ssize_t
) sizeof(reply
)) {
1897 ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
1906 * relay_recv_metadata: receive the metadata for the session.
1908 static int relay_recv_metadata(const struct lttcomm_relayd_hdr
*recv_hdr
,
1909 struct relay_connection
*conn
,
1910 const struct lttng_buffer_view
*payload
)
1913 struct relay_session
*session
= conn
->session
;
1914 struct lttcomm_relayd_metadata_payload metadata_payload_header
;
1915 struct relay_stream
*metadata_stream
;
1916 uint64_t metadata_payload_size
;
1917 struct lttng_buffer_view packet_view
;
1920 ERR("Metadata sent before version check");
1925 if (recv_hdr
->data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1926 ERR("Incorrect data size");
1930 metadata_payload_size
= recv_hdr
->data_size
-
1931 sizeof(struct lttcomm_relayd_metadata_payload
);
1933 memcpy(&metadata_payload_header
, payload
->data
,
1934 sizeof(metadata_payload_header
));
1935 metadata_payload_header
.stream_id
= be64toh(
1936 metadata_payload_header
.stream_id
);
1937 metadata_payload_header
.padding_size
= be32toh(
1938 metadata_payload_header
.padding_size
);
1940 metadata_stream
= stream_get_by_id(metadata_payload_header
.stream_id
);
1941 if (!metadata_stream
) {
1946 packet_view
= lttng_buffer_view_from_view(payload
,
1947 sizeof(metadata_payload_header
), metadata_payload_size
);
1948 if (!lttng_buffer_view_is_valid(&packet_view
)) {
1949 ERR("Invalid metadata packet length announced by header");
1954 pthread_mutex_lock(&metadata_stream
->lock
);
1955 ret
= stream_write(metadata_stream
, &packet_view
,
1956 metadata_payload_header
.padding_size
);
1957 pthread_mutex_unlock(&metadata_stream
->lock
);
1963 stream_put(metadata_stream
);
1969 * relay_send_version: send relayd version number
1971 static int relay_send_version(const struct lttcomm_relayd_hdr
*recv_hdr
,
1972 struct relay_connection
*conn
,
1973 const struct lttng_buffer_view
*payload
)
1977 struct lttcomm_relayd_version reply
, msg
;
1978 bool compatible
= true;
1980 conn
->version_check_done
= true;
1982 /* Get version from the other side. */
1983 if (payload
->size
< sizeof(msg
)) {
1984 ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
1985 sizeof(msg
), payload
->size
);
1990 memcpy(&msg
, payload
->data
, sizeof(msg
));
1991 msg
.major
= be32toh(msg
.major
);
1992 msg
.minor
= be32toh(msg
.minor
);
1994 memset(&reply
, 0, sizeof(reply
));
1995 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1996 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1998 /* Major versions must be the same */
1999 if (reply
.major
!= msg
.major
) {
2000 DBG("Incompatible major versions (%u vs %u), deleting session",
2001 reply
.major
, msg
.major
);
2005 conn
->major
= reply
.major
;
2006 /* We adapt to the lowest compatible version */
2007 if (reply
.minor
<= msg
.minor
) {
2008 conn
->minor
= reply
.minor
;
2010 conn
->minor
= msg
.minor
;
2013 reply
.major
= htobe32(reply
.major
);
2014 reply
.minor
= htobe32(reply
.minor
);
2015 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
2017 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2018 ERR("Failed to send \"send version\" command reply (ret = %zd)",
2031 DBG("Version check done using protocol %u.%u", conn
->major
,
2039 * Check for data pending for a given stream id from the session daemon.
2041 static int relay_data_pending(const struct lttcomm_relayd_hdr
*recv_hdr
,
2042 struct relay_connection
*conn
,
2043 const struct lttng_buffer_view
*payload
)
2045 struct relay_session
*session
= conn
->session
;
2046 struct lttcomm_relayd_data_pending msg
;
2047 struct lttcomm_relayd_generic_reply reply
;
2048 struct relay_stream
*stream
;
2051 uint64_t stream_seq
;
2053 DBG("Data pending command received");
2055 if (!session
|| !conn
->version_check_done
) {
2056 ERR("Trying to check for data before version check");
2058 goto end_no_session
;
2061 if (payload
->size
< sizeof(msg
)) {
2062 ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
2063 sizeof(msg
), payload
->size
);
2065 goto end_no_session
;
2067 memcpy(&msg
, payload
->data
, sizeof(msg
));
2068 msg
.stream_id
= be64toh(msg
.stream_id
);
2069 msg
.last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
2071 stream
= stream_get_by_id(msg
.stream_id
);
2072 if (stream
== NULL
) {
2077 pthread_mutex_lock(&stream
->lock
);
2079 if (session_streams_have_index(session
)) {
2081 * Ensure that both the index and stream data have been
2082 * flushed up to the requested point.
2084 stream_seq
= min(stream
->prev_data_seq
, stream
->prev_index_seq
);
2086 stream_seq
= stream
->prev_data_seq
;
2088 DBG("Data pending for stream id %" PRIu64
": prev_data_seq %" PRIu64
2089 ", prev_index_seq %" PRIu64
2090 ", and last_seq %" PRIu64
, msg
.stream_id
,
2091 stream
->prev_data_seq
, stream
->prev_index_seq
,
2092 msg
.last_net_seq_num
);
2094 /* Avoid wrapping issue */
2095 if (((int64_t) (stream_seq
- msg
.last_net_seq_num
)) >= 0) {
2096 /* Data has in fact been written and is NOT pending */
2099 /* Data still being streamed thus pending */
2103 stream
->data_pending_check_done
= true;
2104 pthread_mutex_unlock(&stream
->lock
);
2109 memset(&reply
, 0, sizeof(reply
));
2110 reply
.ret_code
= htobe32(ret
);
2111 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2112 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2113 ERR("Failed to send \"data pending\" command reply (ret = %zd)",
2123 * Wait for the control socket to reach a quiescent state.
2125 * Note that for now, when receiving this command from the session
2126 * daemon, this means that every subsequent commands or data received on
2127 * the control socket has been handled. So, this is why we simply return
2130 static int relay_quiescent_control(const struct lttcomm_relayd_hdr
*recv_hdr
,
2131 struct relay_connection
*conn
,
2132 const struct lttng_buffer_view
*payload
)
2136 struct relay_stream
*stream
;
2137 struct lttcomm_relayd_quiescent_control msg
;
2138 struct lttcomm_relayd_generic_reply reply
;
2140 DBG("Checking quiescent state on control socket");
2142 if (!conn
->session
|| !conn
->version_check_done
) {
2143 ERR("Trying to check for data before version check");
2145 goto end_no_session
;
2148 if (payload
->size
< sizeof(msg
)) {
2149 ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
2150 sizeof(msg
), payload
->size
);
2152 goto end_no_session
;
2154 memcpy(&msg
, payload
->data
, sizeof(msg
));
2155 msg
.stream_id
= be64toh(msg
.stream_id
);
2157 stream
= stream_get_by_id(msg
.stream_id
);
2161 pthread_mutex_lock(&stream
->lock
);
2162 stream
->data_pending_check_done
= true;
2163 pthread_mutex_unlock(&stream
->lock
);
2165 DBG("Relay quiescent control pending flag set to %" PRIu64
, msg
.stream_id
);
2168 memset(&reply
, 0, sizeof(reply
));
2169 reply
.ret_code
= htobe32(LTTNG_OK
);
2170 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2171 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2172 ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
2184 * Initialize a data pending command. This means that a consumer is about
2185 * to ask for data pending for each stream it holds. Simply iterate over
2186 * all streams of a session and set the data_pending_check_done flag.
2188 * This command returns to the client a LTTNG_OK code.
2190 static int relay_begin_data_pending(const struct lttcomm_relayd_hdr
*recv_hdr
,
2191 struct relay_connection
*conn
,
2192 const struct lttng_buffer_view
*payload
)
2196 struct lttng_ht_iter iter
;
2197 struct lttcomm_relayd_begin_data_pending msg
;
2198 struct lttcomm_relayd_generic_reply reply
;
2199 struct relay_stream
*stream
;
2204 DBG("Init streams for data pending");
2206 if (!conn
->session
|| !conn
->version_check_done
) {
2207 ERR("Trying to check for data before version check");
2209 goto end_no_session
;
2212 if (payload
->size
< sizeof(msg
)) {
2213 ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
2214 sizeof(msg
), payload
->size
);
2216 goto end_no_session
;
2218 memcpy(&msg
, payload
->data
, sizeof(msg
));
2219 msg
.session_id
= be64toh(msg
.session_id
);
2222 * Iterate over all streams to set the begin data pending flag.
2223 * For now, the streams are indexed by stream handle so we have
2224 * to iterate over all streams to find the one associated with
2225 * the right session_id.
2228 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
2230 if (!stream_get(stream
)) {
2233 if (stream
->trace
->session
->id
== msg
.session_id
) {
2234 pthread_mutex_lock(&stream
->lock
);
2235 stream
->data_pending_check_done
= false;
2236 pthread_mutex_unlock(&stream
->lock
);
2237 DBG("Set begin data pending flag to stream %" PRIu64
,
2238 stream
->stream_handle
);
2244 memset(&reply
, 0, sizeof(reply
));
2245 /* All good, send back reply. */
2246 reply
.ret_code
= htobe32(LTTNG_OK
);
2248 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2249 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2250 ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
2262 * End data pending command. This will check, for a given session id, if
2263 * each stream associated with it has its data_pending_check_done flag
2264 * set. If not, this means that the client lost track of the stream but
2265 * the data is still being streamed on our side. In this case, we inform
2266 * the client that data is in flight.
2268 * Return to the client if there is data in flight or not with a ret_code.
2270 static int relay_end_data_pending(const struct lttcomm_relayd_hdr
*recv_hdr
,
2271 struct relay_connection
*conn
,
2272 const struct lttng_buffer_view
*payload
)
2276 struct lttng_ht_iter iter
;
2277 struct lttcomm_relayd_end_data_pending msg
;
2278 struct lttcomm_relayd_generic_reply reply
;
2279 struct relay_stream
*stream
;
2280 uint32_t is_data_inflight
= 0;
2282 DBG("End data pending command");
2284 if (!conn
->session
|| !conn
->version_check_done
) {
2285 ERR("Trying to check for data before version check");
2287 goto end_no_session
;
2290 if (payload
->size
< sizeof(msg
)) {
2291 ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
2292 sizeof(msg
), payload
->size
);
2294 goto end_no_session
;
2296 memcpy(&msg
, payload
->data
, sizeof(msg
));
2297 msg
.session_id
= be64toh(msg
.session_id
);
2300 * Iterate over all streams to see if the begin data pending
2304 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
2306 if (!stream_get(stream
)) {
2309 if (stream
->trace
->session
->id
!= msg
.session_id
) {
2313 pthread_mutex_lock(&stream
->lock
);
2314 if (!stream
->data_pending_check_done
) {
2315 uint64_t stream_seq
;
2317 if (session_streams_have_index(conn
->session
)) {
2319 * Ensure that both the index and stream data have been
2320 * flushed up to the requested point.
2322 stream_seq
= min(stream
->prev_data_seq
, stream
->prev_index_seq
);
2324 stream_seq
= stream
->prev_data_seq
;
2326 if (!stream
->closed
|| !(((int64_t) (stream_seq
- stream
->last_net_seq_num
)) >= 0)) {
2327 is_data_inflight
= 1;
2328 DBG("Data is still in flight for stream %" PRIu64
,
2329 stream
->stream_handle
);
2330 pthread_mutex_unlock(&stream
->lock
);
2335 pthread_mutex_unlock(&stream
->lock
);
2340 memset(&reply
, 0, sizeof(reply
));
2341 /* All good, send back reply. */
2342 reply
.ret_code
= htobe32(is_data_inflight
);
2344 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2345 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2346 ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
2358 * Receive an index for a specific stream.
2360 * Return 0 on success else a negative value.
2362 static int relay_recv_index(const struct lttcomm_relayd_hdr
*recv_hdr
,
2363 struct relay_connection
*conn
,
2364 const struct lttng_buffer_view
*payload
)
2368 struct relay_session
*session
= conn
->session
;
2369 struct lttcomm_relayd_index index_info
;
2370 struct lttcomm_relayd_generic_reply reply
;
2371 struct relay_stream
*stream
;
2376 DBG("Relay receiving index");
2378 if (!session
|| !conn
->version_check_done
) {
2379 ERR("Trying to close a stream before version check");
2381 goto end_no_session
;
2384 msg_len
= lttcomm_relayd_index_len(
2385 lttng_to_index_major(conn
->major
, conn
->minor
),
2386 lttng_to_index_minor(conn
->major
, conn
->minor
));
2387 if (payload
->size
< msg_len
) {
2388 ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
2389 msg_len
, payload
->size
);
2391 goto end_no_session
;
2393 memcpy(&index_info
, payload
->data
, msg_len
);
2394 index_info
.relay_stream_id
= be64toh(index_info
.relay_stream_id
);
2395 index_info
.net_seq_num
= be64toh(index_info
.net_seq_num
);
2396 index_info
.packet_size
= be64toh(index_info
.packet_size
);
2397 index_info
.content_size
= be64toh(index_info
.content_size
);
2398 index_info
.timestamp_begin
= be64toh(index_info
.timestamp_begin
);
2399 index_info
.timestamp_end
= be64toh(index_info
.timestamp_end
);
2400 index_info
.events_discarded
= be64toh(index_info
.events_discarded
);
2401 index_info
.stream_id
= be64toh(index_info
.stream_id
);
2403 if (conn
->minor
>= 8) {
2404 index_info
.stream_instance_id
=
2405 be64toh(index_info
.stream_instance_id
);
2406 index_info
.packet_seq_num
= be64toh(index_info
.packet_seq_num
);
2408 index_info
.stream_instance_id
= -1ULL;
2409 index_info
.packet_seq_num
= -1ULL;
2412 stream
= stream_get_by_id(index_info
.relay_stream_id
);
2414 ERR("stream_get_by_id not found");
2419 pthread_mutex_lock(&stream
->lock
);
2420 ret
= stream_add_index(stream
, &index_info
);
2421 pthread_mutex_unlock(&stream
->lock
);
2423 goto end_stream_put
;
2429 memset(&reply
, 0, sizeof(reply
));
2431 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2433 reply
.ret_code
= htobe32(LTTNG_OK
);
2435 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2436 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2437 ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret
);
2446 * Receive the streams_sent message.
2448 * Return 0 on success else a negative value.
2450 static int relay_streams_sent(const struct lttcomm_relayd_hdr
*recv_hdr
,
2451 struct relay_connection
*conn
,
2452 const struct lttng_buffer_view
*payload
)
2456 struct lttcomm_relayd_generic_reply reply
;
2460 DBG("Relay receiving streams_sent");
2462 if (!conn
->session
|| !conn
->version_check_done
) {
2463 ERR("Trying to close a stream before version check");
2465 goto end_no_session
;
2469 * Publish every pending stream in the connection recv list which are
2470 * now ready to be used by the viewer.
2472 publish_connection_local_streams(conn
);
2474 memset(&reply
, 0, sizeof(reply
));
2475 reply
.ret_code
= htobe32(LTTNG_OK
);
2476 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2477 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2478 ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
2490 static ssize_t
relay_unpack_rotate_streams_header(
2491 const struct lttng_buffer_view
*payload
,
2492 struct lttcomm_relayd_rotate_streams
*_rotate_streams
)
2494 struct lttcomm_relayd_rotate_streams rotate_streams
;
2496 * Set to the smallest version (packed) of `lttcomm_relayd_rotate_streams`.
2497 * This is the smallest version of this structure, but it can be larger;
2498 * this variable is updated once the proper size of the structure is known.
2500 * See comment at the declaration of this structure for more information.
2502 ssize_t header_len
= sizeof(struct lttcomm_relayd_rotate_streams_packed
);
2503 size_t expected_payload_size_no_padding
,
2504 expected_payload_size_3_bytes_padding
,
2505 expected_payload_size_7_bytes_padding
;
2507 if (payload
->size
< header_len
) {
2508 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
2509 header_len
, payload
->size
);
2514 * Some versions incorrectly omitted the LTTNG_PACKED annotation on the
2515 * `new_chunk_id` optional field of struct lttcomm_relayd_rotate_streams.
2517 * We start by "unpacking" `stream_count` to figure out the padding length
2518 * emited by our peer.
2520 memcpy(&rotate_streams
.stream_count
, payload
->data
,
2521 sizeof(rotate_streams
.stream_count
));
2522 rotate_streams
= (typeof(rotate_streams
)) {
2523 .stream_count
= be32toh(rotate_streams
.stream_count
),
2527 * Payload size expected given the possible padding lengths in
2528 * `struct lttcomm_relayd_rotate_streams`.
2530 expected_payload_size_no_padding
= (rotate_streams
.stream_count
*
2531 sizeof(*rotate_streams
.rotation_positions
)) +
2532 sizeof(struct lttcomm_relayd_rotate_streams_packed
);
2533 expected_payload_size_3_bytes_padding
= (rotate_streams
.stream_count
*
2534 sizeof(*rotate_streams
.rotation_positions
)) +
2535 sizeof(struct lttcomm_relayd_rotate_streams_3_bytes_padding
);
2536 expected_payload_size_7_bytes_padding
= (rotate_streams
.stream_count
*
2537 sizeof(*rotate_streams
.rotation_positions
)) +
2538 sizeof(struct lttcomm_relayd_rotate_streams_7_bytes_padding
);
2540 if (payload
->size
== expected_payload_size_no_padding
) {
2541 struct lttcomm_relayd_rotate_streams_packed packed_rotate_streams
;
2544 * This handles cases where someone might build with
2545 * -fpack-struct or any other toolchain that wouldn't produce
2546 * padding to align `value`.
2548 DBG("Received `struct lttcomm_relayd_rotate_streams` with no padding");
2550 header_len
= sizeof(packed_rotate_streams
);
2551 memcpy(&packed_rotate_streams
, payload
->data
, header_len
);
2553 /* Unpack the packed structure to the natively-packed version. */
2554 *_rotate_streams
= (typeof(*_rotate_streams
)) {
2555 .stream_count
= be32toh(packed_rotate_streams
.stream_count
),
2556 .new_chunk_id
= (typeof(_rotate_streams
->new_chunk_id
)) {
2557 .is_set
= !!packed_rotate_streams
.new_chunk_id
.is_set
,
2558 .value
= be64toh(packed_rotate_streams
.new_chunk_id
.value
),
2561 } else if (payload
->size
== expected_payload_size_3_bytes_padding
) {
2562 struct lttcomm_relayd_rotate_streams_3_bytes_padding padded_rotate_streams
;
2564 DBG("Received `struct lttcomm_relayd_rotate_streams` with 3 bytes of padding (4-byte aligned peer)");
2566 header_len
= sizeof(padded_rotate_streams
);
2567 memcpy(&padded_rotate_streams
, payload
->data
, header_len
);
2569 /* Unpack the 3-byte padded structure to the natively-packed version. */
2570 *_rotate_streams
= (typeof(*_rotate_streams
)) {
2571 .stream_count
= be32toh(padded_rotate_streams
.stream_count
),
2572 .new_chunk_id
= (typeof(_rotate_streams
->new_chunk_id
)) {
2573 .is_set
= !!padded_rotate_streams
.new_chunk_id
.is_set
,
2574 .value
= be64toh(padded_rotate_streams
.new_chunk_id
.value
),
2577 } else if (payload
->size
== expected_payload_size_7_bytes_padding
) {
2578 struct lttcomm_relayd_rotate_streams_7_bytes_padding padded_rotate_streams
;
2580 DBG("Received `struct lttcomm_relayd_rotate_streams` with 7 bytes of padding (8-byte aligned peer)");
2582 header_len
= sizeof(padded_rotate_streams
);
2583 memcpy(&padded_rotate_streams
, payload
->data
, header_len
);
2585 /* Unpack the 7-byte padded structure to the natively-packed version. */
2586 *_rotate_streams
= (typeof(*_rotate_streams
)) {
2587 .stream_count
= be32toh(padded_rotate_streams
.stream_count
),
2588 .new_chunk_id
= (typeof(_rotate_streams
->new_chunk_id
)) {
2589 .is_set
= !!padded_rotate_streams
.new_chunk_id
.is_set
,
2590 .value
= be64toh(padded_rotate_streams
.new_chunk_id
.value
),
2594 header_len
= sizeof(padded_rotate_streams
);
2596 ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected %zu, %zu or %zu bytes, got %zu bytes",
2597 expected_payload_size_no_padding
,
2598 expected_payload_size_3_bytes_padding
,
2599 expected_payload_size_7_bytes_padding
,
2610 * relay_rotate_session_stream: rotate a stream to a new tracefile for the
2611 * session rotation feature (not the tracefile rotation feature).
2613 static int relay_rotate_session_streams(
2614 const struct lttcomm_relayd_hdr
*recv_hdr
,
2615 struct relay_connection
*conn
,
2616 const struct lttng_buffer_view
*payload
)
2621 enum lttng_error_code reply_code
= LTTNG_ERR_UNK
;
2622 struct relay_session
*session
= conn
->session
;
2623 struct lttcomm_relayd_rotate_streams rotate_streams
;
2624 struct lttcomm_relayd_generic_reply reply
= {};
2625 struct relay_stream
*stream
= NULL
;
2626 struct lttng_trace_chunk
*next_trace_chunk
= NULL
;
2627 struct lttng_buffer_view stream_positions
;
2628 char chunk_id_buf
[MAX_INT_DEC_LEN(uint64_t)];
2629 const char *chunk_id_str
= "none";
2632 if (!session
|| !conn
->version_check_done
) {
2633 ERR("Trying to rotate a stream before version check");
2638 if (session
->major
== 2 && session
->minor
< 11) {
2639 ERR("Unsupported feature before 2.11");
2644 header_len
= relay_unpack_rotate_streams_header(payload
, &rotate_streams
);
2645 if (header_len
< 0) {
2650 if (rotate_streams
.new_chunk_id
.is_set
) {
2652 * Retrieve the trace chunk the stream must transition to. As
2653 * per the protocol, this chunk should have been created
2654 * before this command is received.
2656 next_trace_chunk
= sessiond_trace_chunk_registry_get_chunk(
2657 sessiond_trace_chunk_registry
,
2658 session
->sessiond_uuid
, session
->id
,
2659 rotate_streams
.new_chunk_id
.value
);
2660 if (!next_trace_chunk
) {
2661 char uuid_str
[LTTNG_UUID_STR_LEN
];
2663 lttng_uuid_to_str(session
->sessiond_uuid
, uuid_str
);
2664 ERR("Unknown next trace chunk in ROTATE_STREAMS command: sessiond_uuid = {%s}, session_id = %" PRIu64
2665 ", trace_chunk_id = %" PRIu64
,
2666 uuid_str
, session
->id
,
2667 rotate_streams
.new_chunk_id
.value
);
2668 reply_code
= LTTNG_ERR_INVALID_PROTOCOL
;
2673 ret
= snprintf(chunk_id_buf
, sizeof(chunk_id_buf
), "%" PRIu64
,
2674 rotate_streams
.new_chunk_id
.value
);
2675 if (ret
< 0 || ret
>= sizeof(chunk_id_buf
)) {
2676 chunk_id_str
= "formatting error";
2678 chunk_id_str
= chunk_id_buf
;
2682 DBG("Rotate %" PRIu32
" streams of session \"%s\" to chunk \"%s\"",
2683 rotate_streams
.stream_count
, session
->session_name
,
2686 stream_positions
= lttng_buffer_view_from_view(payload
,
2688 if (!stream_positions
.data
||
2689 stream_positions
.size
<
2690 (rotate_streams
.stream_count
*
2691 sizeof(struct lttcomm_relayd_stream_rotation_position
))) {
2692 reply_code
= LTTNG_ERR_INVALID_PROTOCOL
;
2697 for (i
= 0; i
< rotate_streams
.stream_count
; i
++) {
2698 struct lttcomm_relayd_stream_rotation_position
*position_comm
=
2699 &((typeof(position_comm
)) stream_positions
.data
)[i
];
2700 const struct lttcomm_relayd_stream_rotation_position pos
= {
2701 .stream_id
= be64toh(position_comm
->stream_id
),
2702 .rotate_at_seq_num
= be64toh(
2703 position_comm
->rotate_at_seq_num
),
2706 stream
= stream_get_by_id(pos
.stream_id
);
2708 reply_code
= LTTNG_ERR_INVALID
;
2713 pthread_mutex_lock(&stream
->lock
);
2714 ret
= stream_set_pending_rotation(stream
, next_trace_chunk
,
2715 pos
.rotate_at_seq_num
);
2716 pthread_mutex_unlock(&stream
->lock
);
2718 reply_code
= LTTNG_ERR_FILE_CREATION_ERROR
;
2726 reply_code
= LTTNG_OK
;
2733 reply
.ret_code
= htobe32((uint32_t) reply_code
);
2734 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
2735 sizeof(struct lttcomm_relayd_generic_reply
), 0);
2736 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2737 ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
2742 lttng_trace_chunk_put(next_trace_chunk
);
2747 * relay_create_trace_chunk: create a new trace chunk
2749 static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr
*recv_hdr
,
2750 struct relay_connection
*conn
,
2751 const struct lttng_buffer_view
*payload
)
2755 struct relay_session
*session
= conn
->session
;
2756 struct lttcomm_relayd_create_trace_chunk
*msg
;
2757 struct lttcomm_relayd_generic_reply reply
= {};
2758 struct lttng_buffer_view header_view
;
2759 struct lttng_trace_chunk
*chunk
= NULL
, *published_chunk
= NULL
;
2760 enum lttng_error_code reply_code
= LTTNG_OK
;
2761 enum lttng_trace_chunk_status chunk_status
;
2762 const char *new_path
;
2764 if (!session
|| !conn
->version_check_done
) {
2765 ERR("Trying to create a trace chunk before version check");
2770 if (session
->major
== 2 && session
->minor
< 11) {
2771 ERR("Chunk creation command is unsupported before 2.11");
2776 header_view
= lttng_buffer_view_from_view(payload
, 0, sizeof(*msg
));
2777 if (!lttng_buffer_view_is_valid(&header_view
)) {
2778 ERR("Failed to receive payload of chunk creation command");
2783 /* Convert to host endianness. */
2784 msg
= (typeof(msg
)) header_view
.data
;
2785 msg
->chunk_id
= be64toh(msg
->chunk_id
);
2786 msg
->creation_timestamp
= be64toh(msg
->creation_timestamp
);
2787 msg
->override_name_length
= be32toh(msg
->override_name_length
);
2789 if (session
->current_trace_chunk
&&
2790 !lttng_trace_chunk_get_name_overridden(session
->current_trace_chunk
)) {
2791 chunk_status
= lttng_trace_chunk_rename_path(session
->current_trace_chunk
,
2792 DEFAULT_CHUNK_TMP_OLD_DIRECTORY
);
2793 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
2794 ERR("Failed to rename old chunk");
2796 reply_code
= LTTNG_ERR_UNK
;
2800 session
->ongoing_rotation
= true;
2801 if (!session
->current_trace_chunk
) {
2802 if (!session
->has_rotated
) {
2808 new_path
= DEFAULT_CHUNK_TMP_NEW_DIRECTORY
;
2810 chunk
= lttng_trace_chunk_create(
2811 msg
->chunk_id
, msg
->creation_timestamp
, new_path
);
2813 ERR("Failed to create trace chunk in trace chunk creation command");
2815 reply_code
= LTTNG_ERR_NOMEM
;
2818 lttng_trace_chunk_set_fd_tracker(chunk
, the_fd_tracker
);
2820 if (msg
->override_name_length
) {
2822 const struct lttng_buffer_view chunk_name_view
=
2823 lttng_buffer_view_from_view(payload
,
2825 msg
->override_name_length
);
2827 if (!lttng_buffer_view_is_valid(&chunk_name_view
)) {
2828 ERR("Invalid payload of chunk creation command (protocol error): buffer too short for expected name length");
2830 reply_code
= LTTNG_ERR_INVALID
;
2834 name
= chunk_name_view
.data
;
2835 if (name
[msg
->override_name_length
- 1]) {
2836 ERR("Invalid payload of chunk creation command (protocol error): name is not null-terminated");
2838 reply_code
= LTTNG_ERR_INVALID
;
2842 chunk_status
= lttng_trace_chunk_override_name(
2843 chunk
, chunk_name_view
.data
);
2844 switch (chunk_status
) {
2845 case LTTNG_TRACE_CHUNK_STATUS_OK
:
2847 case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT
:
2848 ERR("Failed to set the name of new trace chunk in trace chunk creation command (invalid name)");
2849 reply_code
= LTTNG_ERR_INVALID
;
2853 ERR("Failed to set the name of new trace chunk in trace chunk creation command (unknown error)");
2854 reply_code
= LTTNG_ERR_UNK
;
2860 chunk_status
= lttng_trace_chunk_set_credentials_current_user(chunk
);
2861 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
2862 reply_code
= LTTNG_ERR_UNK
;
2867 assert(conn
->session
->output_directory
);
2868 chunk_status
= lttng_trace_chunk_set_as_owner(chunk
,
2869 conn
->session
->output_directory
);
2870 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
2871 reply_code
= LTTNG_ERR_UNK
;
2876 published_chunk
= sessiond_trace_chunk_registry_publish_chunk(
2877 sessiond_trace_chunk_registry
,
2878 conn
->session
->sessiond_uuid
,
2881 if (!published_chunk
) {
2882 char uuid_str
[LTTNG_UUID_STR_LEN
];
2884 lttng_uuid_to_str(conn
->session
->sessiond_uuid
, uuid_str
);
2885 ERR("Failed to publish chunk: sessiond_uuid = %s, session_id = %" PRIu64
", chunk_id = %" PRIu64
,
2890 reply_code
= LTTNG_ERR_NOMEM
;
2894 pthread_mutex_lock(&conn
->session
->lock
);
2895 if (conn
->session
->pending_closure_trace_chunk
) {
2897 * Invalid; this means a second create_trace_chunk command was
2898 * received before a close_trace_chunk.
2900 ERR("Invalid trace chunk close command received; a trace chunk is already waiting for a trace chunk close command");
2901 reply_code
= LTTNG_ERR_INVALID_PROTOCOL
;
2903 goto end_unlock_session
;
2905 conn
->session
->pending_closure_trace_chunk
=
2906 conn
->session
->current_trace_chunk
;
2907 conn
->session
->current_trace_chunk
= published_chunk
;
2908 published_chunk
= NULL
;
2909 if (!conn
->session
->pending_closure_trace_chunk
) {
2910 session
->ongoing_rotation
= false;
2913 pthread_mutex_unlock(&conn
->session
->lock
);
2915 reply
.ret_code
= htobe32((uint32_t) reply_code
);
2916 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
,
2918 sizeof(struct lttcomm_relayd_generic_reply
),
2920 if (send_ret
< (ssize_t
) sizeof(reply
)) {
2921 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
2926 lttng_trace_chunk_put(chunk
);
2927 lttng_trace_chunk_put(published_chunk
);
2932 * relay_close_trace_chunk: close a trace chunk
2934 static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr
*recv_hdr
,
2935 struct relay_connection
*conn
,
2936 const struct lttng_buffer_view
*payload
)
2938 int ret
= 0, buf_ret
;
2940 struct relay_session
*session
= conn
->session
;
2941 struct lttcomm_relayd_close_trace_chunk
*msg
;
2942 struct lttcomm_relayd_close_trace_chunk_reply reply
= {};
2943 struct lttng_buffer_view header_view
;
2944 struct lttng_trace_chunk
*chunk
= NULL
;
2945 enum lttng_error_code reply_code
= LTTNG_OK
;
2946 enum lttng_trace_chunk_status chunk_status
;
2948 LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type
) close_command
= {};
2949 time_t close_timestamp
;
2950 char closed_trace_chunk_path
[LTTNG_PATH_MAX
];
2951 size_t path_length
= 0;
2952 const char *chunk_name
= NULL
;
2953 struct lttng_dynamic_buffer reply_payload
;
2954 const char *new_path
;
2956 lttng_dynamic_buffer_init(&reply_payload
);
2958 if (!session
|| !conn
->version_check_done
) {
2959 ERR("Trying to close a trace chunk before version check");
2964 if (session
->major
== 2 && session
->minor
< 11) {
2965 ERR("Chunk close command is unsupported before 2.11");
2970 header_view
= lttng_buffer_view_from_view(payload
, 0, sizeof(*msg
));
2971 if (!lttng_buffer_view_is_valid(&header_view
)) {
2972 ERR("Failed to receive payload of chunk close command");
2977 /* Convert to host endianness. */
2978 msg
= (typeof(msg
)) header_view
.data
;
2979 chunk_id
= be64toh(msg
->chunk_id
);
2980 close_timestamp
= (time_t) be64toh(msg
->close_timestamp
);
2981 close_command
= (typeof(close_command
)){
2982 .value
= be32toh(msg
->close_command
.value
),
2983 .is_set
= msg
->close_command
.is_set
,
2986 chunk
= sessiond_trace_chunk_registry_get_chunk(
2987 sessiond_trace_chunk_registry
,
2988 conn
->session
->sessiond_uuid
,
2992 char uuid_str
[LTTNG_UUID_STR_LEN
];
2994 lttng_uuid_to_str(conn
->session
->sessiond_uuid
, uuid_str
);
2995 ERR("Failed to find chunk to close: sessiond_uuid = %s, session_id = %" PRIu64
", chunk_id = %" PRIu64
,
3000 reply_code
= LTTNG_ERR_NOMEM
;
3004 pthread_mutex_lock(&session
->lock
);
3005 if (close_command
.is_set
&&
3006 close_command
.value
== LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE
) {
3008 * Clear command. It is a protocol error to ask for a
3009 * clear on a relay which does not allow it. Querying
3010 * the configuration allows figuring out whether
3011 * clearing is allowed before doing the clear.
3013 if (!opt_allow_clear
) {
3015 reply_code
= LTTNG_ERR_INVALID_PROTOCOL
;
3016 goto end_unlock_session
;
3019 if (session
->pending_closure_trace_chunk
&&
3020 session
->pending_closure_trace_chunk
!= chunk
) {
3021 ERR("Trace chunk close command for session \"%s\" does not target the trace chunk pending closure",
3022 session
->session_name
);
3023 reply_code
= LTTNG_ERR_INVALID_PROTOCOL
;
3025 goto end_unlock_session
;
3028 if (session
->current_trace_chunk
&& session
->current_trace_chunk
!= chunk
&&
3029 !lttng_trace_chunk_get_name_overridden(session
->current_trace_chunk
)) {
3030 if (close_command
.is_set
&&
3031 close_command
.value
== LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE
&&
3032 !session
->has_rotated
) {
3033 /* New chunk stays in session output directory. */
3036 /* Use chunk name for new chunk. */
3039 /* Rename new chunk path. */
3040 chunk_status
= lttng_trace_chunk_rename_path(session
->current_trace_chunk
,
3042 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
3044 goto end_unlock_session
;
3046 session
->ongoing_rotation
= false;
3048 if ((!close_command
.is_set
||
3049 close_command
.value
== LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
) &&
3050 !lttng_trace_chunk_get_name_overridden(chunk
)) {
3051 const char *old_path
;
3053 if (!session
->has_rotated
) {
3058 /* We need to move back the .tmp_old_chunk to its rightful place. */
3059 chunk_status
= lttng_trace_chunk_rename_path(chunk
, old_path
);
3060 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
3062 goto end_unlock_session
;
3065 chunk_status
= lttng_trace_chunk_set_close_timestamp(
3066 chunk
, close_timestamp
);
3067 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
3068 ERR("Failed to set trace chunk close timestamp");
3070 reply_code
= LTTNG_ERR_UNK
;
3071 goto end_unlock_session
;
3074 if (close_command
.is_set
) {
3075 chunk_status
= lttng_trace_chunk_set_close_command(
3076 chunk
, close_command
.value
);
3077 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
3079 reply_code
= LTTNG_ERR_INVALID
;
3080 goto end_unlock_session
;
3083 chunk_status
= lttng_trace_chunk_get_name(chunk
, &chunk_name
, NULL
);
3084 if (chunk_status
!= LTTNG_TRACE_CHUNK_STATUS_OK
) {
3085 ERR("Failed to get chunk name");
3087 reply_code
= LTTNG_ERR_UNK
;
3088 goto end_unlock_session
;
3090 if (!session
->has_rotated
&& !session
->snapshot
) {
3091 ret
= lttng_strncpy(closed_trace_chunk_path
,
3092 session
->output_path
,
3093 sizeof(closed_trace_chunk_path
));
3095 ERR("Failed to send trace chunk path: path length of %zu bytes exceeds the maximal allowed length of %zu bytes",
3096 strlen(session
->output_path
),
3097 sizeof(closed_trace_chunk_path
));
3098 reply_code
= LTTNG_ERR_NOMEM
;
3100 goto end_unlock_session
;
3103 if (session
->snapshot
) {
3104 ret
= snprintf(closed_trace_chunk_path
,
3105 sizeof(closed_trace_chunk_path
),
3106 "%s/%s", session
->output_path
,
3109 ret
= snprintf(closed_trace_chunk_path
,
3110 sizeof(closed_trace_chunk_path
),
3111 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
3113 session
->output_path
, chunk_name
);
3115 if (ret
< 0 || ret
== sizeof(closed_trace_chunk_path
)) {
3116 ERR("Failed to format closed trace chunk resulting path");
3117 reply_code
= ret
< 0 ? LTTNG_ERR_UNK
: LTTNG_ERR_NOMEM
;
3119 goto end_unlock_session
;
3122 if (close_command
.is_set
&&
3123 close_command
.value
== LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
) {
3124 session
->has_rotated
= true;
3126 DBG("Reply chunk path on close: %s", closed_trace_chunk_path
);
3127 path_length
= strlen(closed_trace_chunk_path
) + 1;
3128 if (path_length
> UINT32_MAX
) {
3129 ERR("Closed trace chunk path exceeds the maximal length allowed by the protocol");
3131 reply_code
= LTTNG_ERR_INVALID_PROTOCOL
;
3132 goto end_unlock_session
;
3135 if (session
->current_trace_chunk
== chunk
) {
3137 * After a trace chunk close command, no new streams
3138 * referencing the chunk may be created. Hence, on the
3139 * event that no new trace chunk have been created for
3140 * the session, the reference to the current trace chunk
3141 * is released in order to allow it to be reclaimed when
3142 * the last stream releases its reference to it.
3144 lttng_trace_chunk_put(session
->current_trace_chunk
);
3145 session
->current_trace_chunk
= NULL
;
3147 lttng_trace_chunk_put(session
->pending_closure_trace_chunk
);
3148 session
->pending_closure_trace_chunk
= NULL
;
3150 pthread_mutex_unlock(&session
->lock
);
3153 reply
.generic
.ret_code
= htobe32((uint32_t) reply_code
);
3154 reply
.path_length
= htobe32((uint32_t) path_length
);
3155 buf_ret
= lttng_dynamic_buffer_append(
3156 &reply_payload
, &reply
, sizeof(reply
));
3158 ERR("Failed to append \"close trace chunk\" command reply header to payload buffer");
3162 if (reply_code
== LTTNG_OK
) {
3163 buf_ret
= lttng_dynamic_buffer_append(&reply_payload
,
3164 closed_trace_chunk_path
, path_length
);
3166 ERR("Failed to append \"close trace chunk\" command reply path to payload buffer");
3171 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
,
3175 if (send_ret
< reply_payload
.size
) {
3176 ERR("Failed to send \"close trace chunk\" command reply of %zu bytes (ret = %zd)",
3177 reply_payload
.size
, send_ret
);
3182 lttng_trace_chunk_put(chunk
);
3183 lttng_dynamic_buffer_reset(&reply_payload
);
3188 * relay_trace_chunk_exists: check if a trace chunk exists
3190 static int relay_trace_chunk_exists(const struct lttcomm_relayd_hdr
*recv_hdr
,
3191 struct relay_connection
*conn
,
3192 const struct lttng_buffer_view
*payload
)
3196 struct relay_session
*session
= conn
->session
;
3197 struct lttcomm_relayd_trace_chunk_exists
*msg
;
3198 struct lttcomm_relayd_trace_chunk_exists_reply reply
= {};
3199 struct lttng_buffer_view header_view
;
3203 if (!session
|| !conn
->version_check_done
) {
3204 ERR("Trying to check for the existance of a trace chunk before version check");
3209 if (session
->major
== 2 && session
->minor
< 11) {
3210 ERR("Chunk exists command is unsupported before 2.11");
3215 header_view
= lttng_buffer_view_from_view(payload
, 0, sizeof(*msg
));
3216 if (!lttng_buffer_view_is_valid(&header_view
)) {
3217 ERR("Failed to receive payload of chunk exists command");
3222 /* Convert to host endianness. */
3223 msg
= (typeof(msg
)) header_view
.data
;
3224 chunk_id
= be64toh(msg
->chunk_id
);
3226 ret
= sessiond_trace_chunk_registry_chunk_exists(
3227 sessiond_trace_chunk_registry
,
3228 conn
->session
->sessiond_uuid
,
3230 chunk_id
, &chunk_exists
);
3232 * If ret is not 0, send the reply and report the error to the caller.
3233 * It is a protocol (or internal) error and the session/connection
3234 * should be torn down.
3236 reply
= (typeof(reply
)){
3237 .generic
.ret_code
= htobe32((uint32_t)
3238 (ret
== 0 ? LTTNG_OK
: LTTNG_ERR_INVALID_PROTOCOL
)),
3239 .trace_chunk_exists
= ret
== 0 ? chunk_exists
: 0,
3241 send_ret
= conn
->sock
->ops
->sendmsg(
3242 conn
->sock
, &reply
, sizeof(reply
), 0);
3243 if (send_ret
< (ssize_t
) sizeof(reply
)) {
3244 ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
3253 * relay_get_configuration: query whether feature is available
3255 static int relay_get_configuration(const struct lttcomm_relayd_hdr
*recv_hdr
,
3256 struct relay_connection
*conn
,
3257 const struct lttng_buffer_view
*payload
)
3261 struct lttcomm_relayd_get_configuration
*msg
;
3262 struct lttcomm_relayd_get_configuration_reply reply
= {};
3263 struct lttng_buffer_view header_view
;
3264 uint64_t query_flags
= 0;
3265 uint64_t result_flags
= 0;
3267 header_view
= lttng_buffer_view_from_view(payload
, 0, sizeof(*msg
));
3268 if (!lttng_buffer_view_is_valid(&header_view
)) {
3269 ERR("Failed to receive payload of chunk close command");
3274 /* Convert to host endianness. */
3275 msg
= (typeof(msg
)) header_view
.data
;
3276 query_flags
= be64toh(msg
->query_flags
);
3279 ret
= LTTNG_ERR_INVALID_PROTOCOL
;
3282 if (opt_allow_clear
) {
3283 result_flags
|= LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED
;
3287 reply
= (typeof(reply
)){
3288 .generic
.ret_code
= htobe32((uint32_t)
3289 (ret
== 0 ? LTTNG_OK
: LTTNG_ERR_INVALID_PROTOCOL
)),
3290 .relayd_configuration_flags
= htobe64(result_flags
),
3292 send_ret
= conn
->sock
->ops
->sendmsg(
3293 conn
->sock
, &reply
, sizeof(reply
), 0);
3294 if (send_ret
< (ssize_t
) sizeof(reply
)) {
3295 ERR("Failed to send \"get configuration\" command reply (ret = %zd)",
3303 #define DBG_CMD(cmd_name, conn) \
3304 DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
3306 static int relay_process_control_command(struct relay_connection
*conn
,
3307 const struct lttcomm_relayd_hdr
*header
,
3308 const struct lttng_buffer_view
*payload
)
3312 switch (header
->cmd
) {
3313 case RELAYD_CREATE_SESSION
:
3314 DBG_CMD("RELAYD_CREATE_SESSION", conn
);
3315 ret
= relay_create_session(header
, conn
, payload
);
3317 case RELAYD_ADD_STREAM
:
3318 DBG_CMD("RELAYD_ADD_STREAM", conn
);
3319 ret
= relay_add_stream(header
, conn
, payload
);
3321 case RELAYD_START_DATA
:
3322 DBG_CMD("RELAYD_START_DATA", conn
);
3323 ret
= relay_start(header
, conn
, payload
);
3325 case RELAYD_SEND_METADATA
:
3326 DBG_CMD("RELAYD_SEND_METADATA", conn
);
3327 ret
= relay_recv_metadata(header
, conn
, payload
);
3329 case RELAYD_VERSION
:
3330 DBG_CMD("RELAYD_VERSION", conn
);
3331 ret
= relay_send_version(header
, conn
, payload
);
3333 case RELAYD_CLOSE_STREAM
:
3334 DBG_CMD("RELAYD_CLOSE_STREAM", conn
);
3335 ret
= relay_close_stream(header
, conn
, payload
);
3337 case RELAYD_DATA_PENDING
:
3338 DBG_CMD("RELAYD_DATA_PENDING", conn
);
3339 ret
= relay_data_pending(header
, conn
, payload
);
3341 case RELAYD_QUIESCENT_CONTROL
:
3342 DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn
);
3343 ret
= relay_quiescent_control(header
, conn
, payload
);
3345 case RELAYD_BEGIN_DATA_PENDING
:
3346 DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn
);
3347 ret
= relay_begin_data_pending(header
, conn
, payload
);
3349 case RELAYD_END_DATA_PENDING
:
3350 DBG_CMD("RELAYD_END_DATA_PENDING", conn
);
3351 ret
= relay_end_data_pending(header
, conn
, payload
);
3353 case RELAYD_SEND_INDEX
:
3354 DBG_CMD("RELAYD_SEND_INDEX", conn
);
3355 ret
= relay_recv_index(header
, conn
, payload
);
3357 case RELAYD_STREAMS_SENT
:
3358 DBG_CMD("RELAYD_STREAMS_SENT", conn
);
3359 ret
= relay_streams_sent(header
, conn
, payload
);
3361 case RELAYD_RESET_METADATA
:
3362 DBG_CMD("RELAYD_RESET_METADATA", conn
);
3363 ret
= relay_reset_metadata(header
, conn
, payload
);
3365 case RELAYD_ROTATE_STREAMS
:
3366 DBG_CMD("RELAYD_ROTATE_STREAMS", conn
);
3367 ret
= relay_rotate_session_streams(header
, conn
, payload
);
3369 case RELAYD_CREATE_TRACE_CHUNK
:
3370 DBG_CMD("RELAYD_CREATE_TRACE_CHUNK", conn
);
3371 ret
= relay_create_trace_chunk(header
, conn
, payload
);
3373 case RELAYD_CLOSE_TRACE_CHUNK
:
3374 DBG_CMD("RELAYD_CLOSE_TRACE_CHUNK", conn
);
3375 ret
= relay_close_trace_chunk(header
, conn
, payload
);
3377 case RELAYD_TRACE_CHUNK_EXISTS
:
3378 DBG_CMD("RELAYD_TRACE_CHUNK_EXISTS", conn
);
3379 ret
= relay_trace_chunk_exists(header
, conn
, payload
);
3381 case RELAYD_GET_CONFIGURATION
:
3382 DBG_CMD("RELAYD_GET_CONFIGURATION", conn
);
3383 ret
= relay_get_configuration(header
, conn
, payload
);
3385 case RELAYD_UPDATE_SYNC_INFO
:
3387 ERR("Received unknown command (%u)", header
->cmd
);
3388 relay_unknown_command(conn
);
3397 static enum relay_connection_status
relay_process_control_receive_payload(
3398 struct relay_connection
*conn
)
3401 enum relay_connection_status status
= RELAY_CONNECTION_STATUS_OK
;
3402 struct lttng_dynamic_buffer
*reception_buffer
=
3403 &conn
->protocol
.ctrl
.reception_buffer
;
3404 struct ctrl_connection_state_receive_payload
*state
=
3405 &conn
->protocol
.ctrl
.state
.receive_payload
;
3406 struct lttng_buffer_view payload_view
;
3408 if (state
->left_to_receive
== 0) {
3409 /* Short-circuit for payload-less commands. */
3410 goto reception_complete
;
3413 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
,
3414 reception_buffer
->data
+ state
->received
,
3415 state
->left_to_receive
, MSG_DONTWAIT
);
3417 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
3418 PERROR("Unable to receive command payload on sock %d",
3420 status
= RELAY_CONNECTION_STATUS_ERROR
;
3423 } else if (ret
== 0) {
3424 DBG("Socket %d performed an orderly shutdown (received EOF)", conn
->sock
->fd
);
3425 status
= RELAY_CONNECTION_STATUS_CLOSED
;
3430 assert(ret
<= state
->left_to_receive
);
3432 state
->left_to_receive
-= ret
;
3433 state
->received
+= ret
;
3435 if (state
->left_to_receive
> 0) {
3437 * Can't transition to the protocol's next state, wait to
3438 * receive the rest of the header.
3440 DBG3("Partial reception of control connection protocol payload (received %" PRIu64
" bytes, %" PRIu64
" bytes left to receive, fd = %i)",
3441 state
->received
, state
->left_to_receive
,
3447 DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64
" bytes",
3448 conn
->sock
->fd
, state
->received
);
3450 * The payload required to process the command has been received.
3451 * A view to the reception buffer is forwarded to the various
3452 * commands and the state of the control is reset on success.
3454 * Commands are responsible for sending their reply to the peer.
3456 payload_view
= lttng_buffer_view_from_dynamic_buffer(reception_buffer
,
3458 ret
= relay_process_control_command(conn
,
3459 &state
->header
, &payload_view
);
3461 status
= RELAY_CONNECTION_STATUS_ERROR
;
3465 ret
= connection_reset_protocol_state(conn
);
3467 status
= RELAY_CONNECTION_STATUS_ERROR
;
3473 static enum relay_connection_status
relay_process_control_receive_header(
3474 struct relay_connection
*conn
)
3477 enum relay_connection_status status
= RELAY_CONNECTION_STATUS_OK
;
3478 struct lttcomm_relayd_hdr header
;
3479 struct lttng_dynamic_buffer
*reception_buffer
=
3480 &conn
->protocol
.ctrl
.reception_buffer
;
3481 struct ctrl_connection_state_receive_header
*state
=
3482 &conn
->protocol
.ctrl
.state
.receive_header
;
3484 assert(state
->left_to_receive
!= 0);
3486 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
,
3487 reception_buffer
->data
+ state
->received
,
3488 state
->left_to_receive
, MSG_DONTWAIT
);
3490 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
3491 PERROR("Unable to receive control command header on sock %d",
3493 status
= RELAY_CONNECTION_STATUS_ERROR
;
3496 } else if (ret
== 0) {
3497 DBG("Socket %d performed an orderly shutdown (received EOF)", conn
->sock
->fd
);
3498 status
= RELAY_CONNECTION_STATUS_CLOSED
;
3503 assert(ret
<= state
->left_to_receive
);
3505 state
->left_to_receive
-= ret
;
3506 state
->received
+= ret
;
3508 if (state
->left_to_receive
> 0) {
3510 * Can't transition to the protocol's next state, wait to
3511 * receive the rest of the header.
3513 DBG3("Partial reception of control connection protocol header (received %" PRIu64
" bytes, %" PRIu64
" bytes left to receive, fd = %i)",
3514 state
->received
, state
->left_to_receive
,
3519 /* Transition to next state: receiving the command's payload. */
3520 conn
->protocol
.ctrl
.state_id
=
3521 CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD
;
3522 memcpy(&header
, reception_buffer
->data
, sizeof(header
));
3523 header
.circuit_id
= be64toh(header
.circuit_id
);
3524 header
.data_size
= be64toh(header
.data_size
);
3525 header
.cmd
= be32toh(header
.cmd
);
3526 header
.cmd_version
= be32toh(header
.cmd_version
);
3527 memcpy(&conn
->protocol
.ctrl
.state
.receive_payload
.header
,
3528 &header
, sizeof(header
));
3530 DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32
", cmd_version = %" PRIu32
", payload size = %" PRIu64
" bytes",
3531 conn
->sock
->fd
, header
.cmd
, header
.cmd_version
,
3534 if (header
.data_size
> DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE
) {
3535 ERR("Command header indicates a payload (%" PRIu64
" bytes) that exceeds the maximal payload size allowed on a control connection.",
3537 status
= RELAY_CONNECTION_STATUS_ERROR
;
3541 conn
->protocol
.ctrl
.state
.receive_payload
.left_to_receive
=
3543 conn
->protocol
.ctrl
.state
.receive_payload
.received
= 0;
3544 ret
= lttng_dynamic_buffer_set_size(reception_buffer
,
3547 status
= RELAY_CONNECTION_STATUS_ERROR
;
3551 if (header
.data_size
== 0) {
3553 * Manually invoke the next state as the poll loop
3554 * will not wake-up to allow us to proceed further.
3556 status
= relay_process_control_receive_payload(conn
);
3563 * Process the commands received on the control socket
3565 static enum relay_connection_status
relay_process_control(
3566 struct relay_connection
*conn
)
3568 enum relay_connection_status status
;
3570 switch (conn
->protocol
.ctrl
.state_id
) {
3571 case CTRL_CONNECTION_STATE_RECEIVE_HEADER
:
3572 status
= relay_process_control_receive_header(conn
);
3574 case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD
:
3575 status
= relay_process_control_receive_payload(conn
);
3578 ERR("Unknown control connection protocol state encountered.");
3585 static enum relay_connection_status
relay_process_data_receive_header(
3586 struct relay_connection
*conn
)
3589 enum relay_connection_status status
= RELAY_CONNECTION_STATUS_OK
;
3590 struct data_connection_state_receive_header
*state
=
3591 &conn
->protocol
.data
.state
.receive_header
;
3592 struct lttcomm_relayd_data_hdr header
;
3593 struct relay_stream
*stream
;
3595 assert(state
->left_to_receive
!= 0);
3597 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
,
3598 state
->header_reception_buffer
+ state
->received
,
3599 state
->left_to_receive
, MSG_DONTWAIT
);
3601 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
3602 PERROR("Unable to receive data header on sock %d", conn
->sock
->fd
);
3603 status
= RELAY_CONNECTION_STATUS_ERROR
;
3606 } else if (ret
== 0) {
3607 /* Orderly shutdown. Not necessary to print an error. */
3608 DBG("Socket %d performed an orderly shutdown (received EOF)", conn
->sock
->fd
);
3609 status
= RELAY_CONNECTION_STATUS_CLOSED
;
3614 assert(ret
<= state
->left_to_receive
);
3616 state
->left_to_receive
-= ret
;
3617 state
->received
+= ret
;
3619 if (state
->left_to_receive
> 0) {
3621 * Can't transition to the protocol's next state, wait to
3622 * receive the rest of the header.
3624 DBG3("Partial reception of data connection header (received %" PRIu64
" bytes, %" PRIu64
" bytes left to receive, fd = %i)",
3625 state
->received
, state
->left_to_receive
,
3630 /* Transition to next state: receiving the payload. */
3631 conn
->protocol
.data
.state_id
= DATA_CONNECTION_STATE_RECEIVE_PAYLOAD
;
3633 memcpy(&header
, state
->header_reception_buffer
, sizeof(header
));
3634 header
.circuit_id
= be64toh(header
.circuit_id
);
3635 header
.stream_id
= be64toh(header
.stream_id
);
3636 header
.data_size
= be32toh(header
.data_size
);
3637 header
.net_seq_num
= be64toh(header
.net_seq_num
);
3638 header
.padding_size
= be32toh(header
.padding_size
);
3639 memcpy(&conn
->protocol
.data
.state
.receive_payload
.header
, &header
, sizeof(header
));
3641 conn
->protocol
.data
.state
.receive_payload
.left_to_receive
=
3643 conn
->protocol
.data
.state
.receive_payload
.received
= 0;
3644 conn
->protocol
.data
.state
.receive_payload
.rotate_index
= false;
3646 DBG("Received data connection header on fd %i: circuit_id = %" PRIu64
", stream_id = %" PRIu64
", data_size = %" PRIu32
", net_seq_num = %" PRIu64
", padding_size = %" PRIu32
,
3647 conn
->sock
->fd
, header
.circuit_id
,
3648 header
.stream_id
, header
.data_size
,
3649 header
.net_seq_num
, header
.padding_size
);
3651 stream
= stream_get_by_id(header
.stream_id
);
3653 DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64
,
3655 /* Protocol error. */
3656 status
= RELAY_CONNECTION_STATUS_ERROR
;
3660 pthread_mutex_lock(&stream
->lock
);
3661 /* Prepare stream for the reception of a new packet. */
3662 ret
= stream_init_packet(stream
, header
.data_size
,
3663 &conn
->protocol
.data
.state
.receive_payload
.rotate_index
);
3664 pthread_mutex_unlock(&stream
->lock
);
3666 ERR("Failed to rotate stream output file");
3667 status
= RELAY_CONNECTION_STATUS_ERROR
;
3668 goto end_stream_unlock
;
3677 static enum relay_connection_status
relay_process_data_receive_payload(
3678 struct relay_connection
*conn
)
3681 enum relay_connection_status status
= RELAY_CONNECTION_STATUS_OK
;
3682 struct relay_stream
*stream
;
3683 struct data_connection_state_receive_payload
*state
=
3684 &conn
->protocol
.data
.state
.receive_payload
;
3685 const size_t chunk_size
= RECV_DATA_BUFFER_SIZE
;
3686 char data_buffer
[chunk_size
];
3687 bool partial_recv
= false;
3688 bool new_stream
= false, close_requested
= false, index_flushed
= false;
3689 uint64_t left_to_receive
= state
->left_to_receive
;
3690 struct relay_session
*session
;
3692 DBG3("Receiving data for stream id %" PRIu64
" seqnum %" PRIu64
", %" PRIu64
" bytes received, %" PRIu64
" bytes left to receive",
3693 state
->header
.stream_id
, state
->header
.net_seq_num
,
3694 state
->received
, left_to_receive
);
3696 stream
= stream_get_by_id(state
->header
.stream_id
);
3698 /* Protocol error. */
3699 ERR("relay_process_data_receive_payload: cannot find stream %" PRIu64
,
3700 state
->header
.stream_id
);
3701 status
= RELAY_CONNECTION_STATUS_ERROR
;
3705 pthread_mutex_lock(&stream
->lock
);
3706 session
= stream
->trace
->session
;
3707 if (!conn
->session
) {
3708 ret
= connection_set_session(conn
, session
);
3710 status
= RELAY_CONNECTION_STATUS_ERROR
;
3711 goto end_stream_unlock
;
3716 * The size of the "chunk" received on any iteration is bounded by:
3717 * - the data left to receive,
3718 * - the data immediately available on the socket,
3719 * - the on-stack data buffer
3721 while (left_to_receive
> 0 && !partial_recv
) {
3722 size_t recv_size
= min(left_to_receive
, chunk_size
);
3723 struct lttng_buffer_view packet_chunk
;
3725 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
,
3726 recv_size
, MSG_DONTWAIT
);
3728 if (errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
3729 PERROR("Socket %d error", conn
->sock
->fd
);
3730 status
= RELAY_CONNECTION_STATUS_ERROR
;
3732 goto end_stream_unlock
;
3733 } else if (ret
== 0) {
3734 /* No more data ready to be consumed on socket. */
3735 DBG3("No more data ready for consumption on data socket of stream id %" PRIu64
,
3736 state
->header
.stream_id
);
3737 status
= RELAY_CONNECTION_STATUS_CLOSED
;
3739 } else if (ret
< (int) recv_size
) {
3741 * All the data available on the socket has been
3744 partial_recv
= true;
3748 packet_chunk
= lttng_buffer_view_init(data_buffer
,
3750 assert(packet_chunk
.data
);
3752 ret
= stream_write(stream
, &packet_chunk
, 0);
3754 ERR("Relay error writing data to file");
3755 status
= RELAY_CONNECTION_STATUS_ERROR
;
3756 goto end_stream_unlock
;
3759 left_to_receive
-= recv_size
;
3760 state
->received
+= recv_size
;
3761 state
->left_to_receive
= left_to_receive
;
3764 if (state
->left_to_receive
> 0) {
3766 * Did not receive all the data expected, wait for more data to
3767 * become available on the socket.
3769 DBG3("Partial receive on data connection of stream id %" PRIu64
", %" PRIu64
" bytes received, %" PRIu64
" bytes left to receive",
3770 state
->header
.stream_id
, state
->received
,
3771 state
->left_to_receive
);
3772 goto end_stream_unlock
;
3775 ret
= stream_write(stream
, NULL
, state
->header
.padding_size
);
3777 status
= RELAY_CONNECTION_STATUS_ERROR
;
3778 goto end_stream_unlock
;
3781 if (session_streams_have_index(session
)) {
3782 ret
= stream_update_index(stream
, state
->header
.net_seq_num
,
3783 state
->rotate_index
, &index_flushed
,
3784 state
->header
.data_size
+ state
->header
.padding_size
);
3786 ERR("Failed to update index: stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
3787 stream
->stream_handle
,
3788 state
->header
.net_seq_num
, ret
);
3789 status
= RELAY_CONNECTION_STATUS_ERROR
;
3790 goto end_stream_unlock
;
3794 if (stream
->prev_data_seq
== -1ULL) {
3798 ret
= stream_complete_packet(stream
, state
->header
.data_size
+
3799 state
->header
.padding_size
, state
->header
.net_seq_num
,
3802 status
= RELAY_CONNECTION_STATUS_ERROR
;
3803 goto end_stream_unlock
;
3807 * Resetting the protocol state (to RECEIVE_HEADER) will trash the
3808 * contents of *state which are aliased (union) to the same location as
3809 * the new state. Don't use it beyond this point.
3811 connection_reset_protocol_state(conn
);
3815 close_requested
= stream
->close_requested
;
3816 pthread_mutex_unlock(&stream
->lock
);
3817 if (close_requested
&& left_to_receive
== 0) {
3818 try_stream_close(stream
);
3822 pthread_mutex_lock(&session
->lock
);
3823 uatomic_set(&session
->new_streams
, 1);
3824 pthread_mutex_unlock(&session
->lock
);
3833 * relay_process_data: Process the data received on the data socket
3835 static enum relay_connection_status
relay_process_data(
3836 struct relay_connection
*conn
)
3838 enum relay_connection_status status
;
3840 switch (conn
->protocol
.data
.state_id
) {
3841 case DATA_CONNECTION_STATE_RECEIVE_HEADER
:
3842 status
= relay_process_data_receive_header(conn
);
3844 case DATA_CONNECTION_STATE_RECEIVE_PAYLOAD
:
3845 status
= relay_process_data_receive_payload(conn
);
3848 ERR("Unexpected data connection communication state.");
3855 static void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
3859 (void) lttng_poll_del(events
, pollfd
);
3861 ret
= fd_tracker_close_unsuspendable_fd(the_fd_tracker
, &pollfd
, 1,
3862 fd_tracker_util_close_fd
, NULL
);
3864 ERR("Closing pollfd %d", pollfd
);
3868 static void relay_thread_close_connection(struct lttng_poll_event
*events
,
3869 int pollfd
, struct relay_connection
*conn
)
3871 const char *type_str
;
3873 switch (conn
->type
) {
3878 type_str
= "Control";
3880 case RELAY_VIEWER_COMMAND
:
3881 type_str
= "Viewer Command";
3883 case RELAY_VIEWER_NOTIFICATION
:
3884 type_str
= "Viewer Notification";
3887 type_str
= "Unknown";
3889 cleanup_connection_pollfd(events
, pollfd
);
3890 connection_put(conn
);
3891 DBG("%s connection closed with %d", type_str
, pollfd
);
3895 * This thread does the actual work
3897 static void *relay_thread_worker(void *data
)
3899 int ret
, err
= -1, last_seen_data_fd
= -1;
3901 struct lttng_poll_event events
;
3902 struct lttng_ht
*relay_connections_ht
;
3903 struct lttng_ht_iter iter
;
3904 struct relay_connection
*destroy_conn
= NULL
;
3906 DBG("[thread] Relay worker started");
3908 rcu_register_thread();
3910 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
3912 if (testpoint(relayd_thread_worker
)) {
3913 goto error_testpoint
;
3916 health_code_update();
3918 /* table of connections indexed on socket */
3919 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
3920 if (!relay_connections_ht
) {
3921 goto relay_connections_ht_error
;
3924 ret
= create_named_thread_poll_set(&events
, 2, "Worker thread epoll");
3926 goto error_poll_create
;
3929 ret
= lttng_poll_add(&events
, relay_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
3936 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
3938 health_code_update();
3940 /* Infinite blocking call, waiting for transmission */
3941 DBG3("Relayd worker thread polling...");
3942 health_poll_entry();
3943 ret
= lttng_poll_wait(&events
, -1);
3947 * Restart interrupted system call.
3949 if (errno
== EINTR
) {
3958 * Process control. The control connection is
3959 * prioritized so we don't starve it with high
3960 * throughput tracing data on the data connection.
3962 for (i
= 0; i
< nb_fd
; i
++) {
3963 /* Fetch once the poll data */
3964 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
3965 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3967 health_code_update();
3969 /* Thread quit pipe has been closed. Killing thread. */
3970 ret
= check_thread_quit_pipe(pollfd
, revents
);
3976 /* Inspect the relay conn pipe for new connection */
3977 if (pollfd
== relay_conn_pipe
[0]) {
3978 if (revents
& LPOLLIN
) {
3979 struct relay_connection
*conn
;
3981 ret
= lttng_read(relay_conn_pipe
[0], &conn
, sizeof(conn
));
3985 ret
= lttng_poll_add(&events
,
3987 LPOLLIN
| LPOLLRDHUP
);
3989 ERR("Failed to add new connection file descriptor to poll set");
3992 connection_ht_add(relay_connections_ht
, conn
);
3993 DBG("Connection socket %d added", conn
->sock
->fd
);
3994 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3995 ERR("Relay connection pipe error");
3998 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4002 struct relay_connection
*ctrl_conn
;
4004 ctrl_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
4005 /* If not found, there is a synchronization issue. */
4008 if (ctrl_conn
->type
== RELAY_DATA
) {
4009 if (revents
& LPOLLIN
) {
4011 * Flag the last seen data fd not deleted. It will be
4012 * used as the last seen fd if any fd gets deleted in
4015 last_notdel_data_fd
= pollfd
;
4017 goto put_ctrl_connection
;
4019 assert(ctrl_conn
->type
== RELAY_CONTROL
);
4021 if (revents
& LPOLLIN
) {
4022 enum relay_connection_status status
;
4024 status
= relay_process_control(ctrl_conn
);
4025 if (status
!= RELAY_CONNECTION_STATUS_OK
) {
4027 * On socket error flag the session as aborted to force
4028 * the cleanup of its stream otherwise it can leak
4029 * during the lifetime of the relayd.
4031 * This prevents situations in which streams can be
4032 * left opened because an index was received, the
4033 * control connection is closed, and the data
4034 * connection is closed (uncleanly) before the packet's
4037 * Since the control connection encountered an error,
4038 * it is okay to be conservative and close the
4039 * session right now as we can't rely on the protocol
4040 * being respected anymore.
4042 if (status
== RELAY_CONNECTION_STATUS_ERROR
) {
4043 session_abort(ctrl_conn
->session
);
4046 /* Clear the connection on error or close. */
4047 relay_thread_close_connection(&events
,
4052 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4053 relay_thread_close_connection(&events
,
4055 if (last_seen_data_fd
== pollfd
) {
4056 last_seen_data_fd
= last_notdel_data_fd
;
4059 ERR("Unexpected poll events %u for control sock %d",
4061 connection_put(ctrl_conn
);
4064 put_ctrl_connection
:
4065 connection_put(ctrl_conn
);
4070 * The last loop handled a control request, go back to poll to make
4071 * sure we prioritise the control socket.
4077 if (last_seen_data_fd
>= 0) {
4078 for (i
= 0; i
< nb_fd
; i
++) {
4079 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4081 health_code_update();
4083 if (last_seen_data_fd
== pollfd
) {
4090 /* Process data connection. */
4091 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
4092 /* Fetch the poll data. */
4093 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
4094 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4095 struct relay_connection
*data_conn
;
4097 health_code_update();
4100 /* No activity for this FD (poll implementation). */
4104 /* Skip the command pipe. It's handled in the first loop. */
4105 if (pollfd
== relay_conn_pipe
[0]) {
4109 data_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
4111 /* Skip it. Might be removed before. */
4114 if (data_conn
->type
== RELAY_CONTROL
) {
4115 goto put_data_connection
;
4117 assert(data_conn
->type
== RELAY_DATA
);
4119 if (revents
& LPOLLIN
) {
4120 enum relay_connection_status status
;
4122 status
= relay_process_data(data_conn
);
4123 /* Connection closed or error. */
4124 if (status
!= RELAY_CONNECTION_STATUS_OK
) {
4126 * On socket error flag the session as aborted to force
4127 * the cleanup of its stream otherwise it can leak
4128 * during the lifetime of the relayd.
4130 * This prevents situations in which streams can be
4131 * left opened because an index was received, the
4132 * control connection is closed, and the data
4133 * connection is closed (uncleanly) before the packet's
4136 * Since the data connection encountered an error,
4137 * it is okay to be conservative and close the
4138 * session right now as we can't rely on the protocol
4139 * being respected anymore.
4141 if (status
== RELAY_CONNECTION_STATUS_ERROR
) {
4142 session_abort(data_conn
->session
);
4144 relay_thread_close_connection(&events
, pollfd
,
4147 * Every goto restart call sets the last seen fd where
4148 * here we don't really care since we gracefully
4149 * continue the loop after the connection is deleted.
4152 /* Keep last seen port. */
4153 last_seen_data_fd
= pollfd
;
4154 connection_put(data_conn
);
4157 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4158 relay_thread_close_connection(&events
, pollfd
,
4161 ERR("Unknown poll events %u for data sock %d",
4164 put_data_connection
:
4165 connection_put(data_conn
);
4167 last_seen_data_fd
= -1;
4170 /* Normal exit, no error */
4175 /* Cleanup remaining connection object. */
4177 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
,
4180 health_code_update();
4182 session_abort(destroy_conn
->session
);
4185 * No need to grab another ref, because we own
4188 relay_thread_close_connection(&events
, destroy_conn
->sock
->fd
,
4193 (void) fd_tracker_util_poll_clean(the_fd_tracker
, &events
);
4195 lttng_ht_destroy(relay_connections_ht
);
4196 relay_connections_ht_error
:
4197 /* Close relay conn pipes */
4198 (void) fd_tracker_util_pipe_close(the_fd_tracker
,
4201 DBG("Thread exited with error");
4203 DBG("Worker thread cleanup complete");
4207 ERR("Health error occurred in %s", __func__
);
4209 health_unregister(health_relayd
);
4210 rcu_unregister_thread();
4211 lttng_relay_stop_threads();
4216 * Create the relay command pipe to wake thread_manage_apps.
4217 * Closed in cleanup().
4219 static int create_relay_conn_pipe(void)
4221 return fd_tracker_util_pipe_open_cloexec(the_fd_tracker
,
4222 "Relayd connection pipe", relay_conn_pipe
);
4225 static int stdio_open(void *data
, int *fds
)
4227 fds
[0] = fileno(stdout
);
4228 fds
[1] = fileno(stderr
);
4232 static int track_stdio(void)
4235 const char *names
[] = { "stdout", "stderr" };
4237 return fd_tracker_open_unsuspendable_fd(the_fd_tracker
, fds
,
4238 names
, 2, stdio_open
, NULL
);
4244 int main(int argc
, char **argv
)
4246 bool thread_is_rcu_registered
= false;
4247 int ret
= 0, retval
= 0;
4249 char *unlinked_file_directory_path
= NULL
, *output_path
= NULL
;
4251 /* Parse environment variables */
4252 ret
= parse_env_options();
4260 * Command line arguments overwrite environment.
4263 if (set_options(argc
, argv
)) {
4268 if (set_signal_handler()) {
4273 relayd_config_log();
4275 if (opt_print_version
) {
4281 ret
= fclose(stdin
);
4283 PERROR("Failed to close stdin");
4287 DBG("Clear command %s", opt_allow_clear
? "allowed" : "disallowed");
4289 /* Try to create directory if -o, --output is specified. */
4290 if (opt_output_path
) {
4291 if (*opt_output_path
!= '/') {
4292 ERR("Please specify an absolute path for -o, --output PATH");
4297 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
,
4300 ERR("Unable to create %s", opt_output_path
);
4307 if (opt_daemon
|| opt_background
) {
4308 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
4316 if (opt_working_directory
) {
4317 ret
= utils_change_working_directory(opt_working_directory
);
4319 /* All errors are already logged. */
4324 sessiond_trace_chunk_registry
= sessiond_trace_chunk_registry_create();
4325 if (!sessiond_trace_chunk_registry
) {
4326 ERR("Failed to initialize session daemon trace chunk registry");
4332 * The RCU thread registration (and use, through the fd-tracker's
4333 * creation) is done after the daemonization to allow us to not
4334 * deal with liburcu's fork() management as the call RCU needs to
4337 rcu_register_thread();
4338 thread_is_rcu_registered
= true;
4340 output_path
= create_output_path("");
4342 ERR("Failed to get output path");
4346 ret
= asprintf(&unlinked_file_directory_path
, "%s/%s", output_path
,
4347 DEFAULT_UNLINKED_FILES_DIRECTORY
);
4350 ERR("Failed to format unlinked file directory path");
4354 the_fd_tracker
= fd_tracker_create(
4355 unlinked_file_directory_path
, lttng_opt_fd_pool_size
);
4356 free(unlinked_file_directory_path
);
4357 if (!the_fd_tracker
) {
4362 ret
= track_stdio();
4368 /* Initialize thread health monitoring */
4369 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
4370 if (!health_relayd
) {
4371 PERROR("health_app_create error");
4376 /* Create thread quit pipe */
4377 if (init_thread_quit_pipe()) {
4382 /* Setup the thread apps communication pipe. */
4383 if (create_relay_conn_pipe()) {
4388 /* Init relay command queue. */
4389 cds_wfcq_init(&relay_conn_queue
.head
, &relay_conn_queue
.tail
);
4391 /* Initialize communication library */
4393 lttcomm_inet_init();
4395 /* tables of sessions indexed by session ID */
4396 sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
4402 /* tables of streams indexed by stream ID */
4403 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
4404 if (!relay_streams_ht
) {
4409 /* tables of streams indexed by stream ID */
4410 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
4411 if (!viewer_streams_ht
) {
4416 ret
= init_health_quit_pipe();
4422 /* Create thread to manage the client socket */
4423 ret
= pthread_create(&health_thread
, default_pthread_attr(),
4424 thread_manage_health
, (void *) NULL
);
4427 PERROR("pthread_create health");
4432 /* Setup the dispatcher thread */
4433 ret
= pthread_create(&dispatcher_thread
, default_pthread_attr(),
4434 relay_thread_dispatcher
, (void *) NULL
);
4437 PERROR("pthread_create dispatcher");
4439 goto exit_dispatcher_thread
;
4442 /* Setup the worker thread */
4443 ret
= pthread_create(&worker_thread
, default_pthread_attr(),
4444 relay_thread_worker
, NULL
);
4447 PERROR("pthread_create worker");
4449 goto exit_worker_thread
;
4452 /* Setup the listener thread */
4453 ret
= pthread_create(&listener_thread
, default_pthread_attr(),
4454 relay_thread_listener
, (void *) NULL
);
4457 PERROR("pthread_create listener");
4459 goto exit_listener_thread
;
4462 ret
= relayd_live_create(live_uri
);
4464 ERR("Starting live viewer threads");
4470 * This is where we start awaiting program completion (e.g. through
4471 * signal that asks threads to teardown).
4474 ret
= relayd_live_join();
4480 ret
= pthread_join(listener_thread
, &status
);
4483 PERROR("pthread_join listener_thread");
4487 exit_listener_thread
:
4488 ret
= pthread_join(worker_thread
, &status
);
4491 PERROR("pthread_join worker_thread");
4496 ret
= pthread_join(dispatcher_thread
, &status
);
4499 PERROR("pthread_join dispatcher_thread");
4502 exit_dispatcher_thread
:
4504 ret
= pthread_join(health_thread
, &status
);
4507 PERROR("pthread_join health_thread");
4512 * Wait for all pending call_rcu work to complete before tearing
4513 * down data structures. call_rcu worker may be trying to
4514 * perform lookups in those structures.
4519 /* Ensure all prior call_rcu are done. */
4522 if (thread_is_rcu_registered
) {
4523 rcu_unregister_thread();