2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
35 #include <urcu/futex.h>
36 #include <urcu/uatomic.h>
41 #include <lttng/lttng.h>
42 #include <common/common.h>
43 #include <common/compat/poll.h>
44 #include <common/compat/socket.h>
45 #include <common/defaults.h>
46 #include <common/futex.h>
47 #include <common/sessiond-comm/sessiond-comm.h>
48 #include <common/sessiond-comm/inet.h>
49 #include <common/hashtable/hashtable.h>
50 #include <common/sessiond-comm/relayd.h>
51 #include <common/uri.h>
52 #include <common/utils.h>
54 #include "lttng-relayd.h"
56 /* command line options */
57 static int opt_daemon
;
58 static char *opt_output_path
;
59 static struct lttng_uri
*control_uri
= NULL
;
60 static struct lttng_uri
*data_uri
= NULL
;
63 static int is_root
; /* Set to 1 if the daemon is running as root */
66 * Quit pipe for all threads. This permits a single cancellation point
67 * for all threads when receiving an event on the pipe.
69 static int thread_quit_pipe
[2] = { -1, -1 };
72 * This pipe is used to inform the worker thread that a command is queued and
73 * ready to be processed.
75 static int relay_cmd_pipe
[2] = { -1, -1 };
77 /* Shared between threads */
78 static int dispatch_thread_exit
;
80 static pthread_t listener_thread
;
81 static pthread_t dispatcher_thread
;
82 static pthread_t worker_thread
;
84 static uint64_t last_relay_stream_id
= 0;
85 static uint64_t last_relay_session_id
= 0;
88 * Relay command queue.
90 * The relay_thread_listener and relay_thread_dispatcher communicate with this
93 static struct relay_cmd_queue relay_cmd_queue
;
95 /* buffer allocated at startup, used to store the trace data */
96 static char *data_buffer
= NULL
;
97 static unsigned int data_buffer_size
= 0;
100 * usage function on stderr
105 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
106 fprintf(stderr
, " -h, --help Display this usage.\n");
107 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
108 fprintf(stderr
, " -C, --control-port Control port listening (URI)\n");
109 fprintf(stderr
, " -D, --data-port Data port listening (URI)\n");
110 fprintf(stderr
, " -o, --output Output path for traces (PATH)\n");
111 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
115 int parse_args(int argc
, char **argv
)
119 char *default_address
;
121 static struct option long_options
[] = {
122 { "control-port", 1, 0, 'C', },
123 { "data-port", 1, 0, 'D', },
124 { "daemonize", 0, 0, 'd', },
125 { "help", 0, 0, 'h', },
126 { "output", 1, 0, 'o', },
127 { "verbose", 0, 0, 'v', },
132 int option_index
= 0;
133 c
= getopt_long(argc
, argv
, "dhv" "C:D:o:",
134 long_options
, &option_index
);
141 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
143 fprintf(stderr
, " with arg %s\n", optarg
);
147 ret
= uri_parse(optarg
, &control_uri
);
149 ERR("Invalid control URI specified");
152 if (control_uri
->port
== 0) {
153 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
157 ret
= uri_parse(optarg
, &data_uri
);
159 ERR("Invalid data URI specified");
162 if (data_uri
->port
== 0) {
163 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
173 ret
= asprintf(&opt_output_path
, "%s", optarg
);
175 PERROR("asprintf opt_output_path");
180 /* Verbose level can increase using multiple -v */
181 lttng_opt_verbose
+= 1;
184 /* Unknown option or other error.
185 * Error is printed by getopt, just return */
191 /* assign default values */
192 if (control_uri
== NULL
) {
193 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
194 DEFAULT_NETWORK_CONTROL_PORT
);
196 PERROR("asprintf default data address");
200 ret
= uri_parse(default_address
, &control_uri
);
201 free(default_address
);
203 ERR("Invalid control URI specified");
207 if (data_uri
== NULL
) {
208 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
209 DEFAULT_NETWORK_DATA_PORT
);
211 PERROR("asprintf default data address");
215 ret
= uri_parse(default_address
, &data_uri
);
216 free(default_address
);
218 ERR("Invalid data URI specified");
235 /* Close thread quit pipes */
236 utils_close_pipe(thread_quit_pipe
);
238 /* Close relay cmd pipes */
239 utils_close_pipe(relay_cmd_pipe
);
243 * Write to writable pipe used to notify a thread.
246 int notify_thread_pipe(int wpipe
)
251 ret
= write(wpipe
, "!", 1);
252 } while (ret
< 0 && errno
== EINTR
);
254 PERROR("write poll pipe");
261 * Stop all threads by closing the thread quit pipe.
264 void stop_threads(void)
268 /* Stopping all threads */
269 DBG("Terminating all threads");
270 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
272 ERR("write error on thread quit pipe");
275 /* Dispatch thread */
276 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
277 futex_nto1_wake(&relay_cmd_queue
.futex
);
281 * Signal handler for the daemon
283 * Simply stop all worker threads, leaving main() return gracefully after
284 * joining all threads and calling cleanup().
287 void sighandler(int sig
)
291 DBG("SIGPIPE caught");
294 DBG("SIGINT caught");
298 DBG("SIGTERM caught");
307 * Setup signal handler for :
308 * SIGINT, SIGTERM, SIGPIPE
311 int set_signal_handler(void)
317 if ((ret
= sigemptyset(&sigset
)) < 0) {
318 PERROR("sigemptyset");
322 sa
.sa_handler
= sighandler
;
325 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
330 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
335 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
340 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
346 * Init thread quit pipe.
348 * Return -1 on error or 0 if all pipes are created.
351 int init_thread_quit_pipe(void)
355 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
361 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
364 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
368 if (events
== NULL
|| size
== 0) {
373 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
379 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
391 * Check if the thread quit pipe was triggered.
393 * Return 1 if it was triggered else 0;
396 int check_thread_quit_pipe(int fd
, uint32_t events
)
398 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
406 * Create and init socket from uri.
409 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
412 struct lttcomm_sock
*sock
= NULL
;
414 sock
= lttcomm_alloc_sock_from_uri(uri
);
416 ERR("Allocating socket");
420 ret
= lttcomm_create_sock(sock
);
424 DBG("Listening on sock %d", sock
->fd
);
426 ret
= sock
->ops
->bind(sock
);
431 ret
= sock
->ops
->listen(sock
, -1);
441 lttcomm_destroy_sock(sock
);
447 * This thread manages the listening for new connections on the network
450 void *relay_thread_listener(void *data
)
454 uint32_t revents
, nb_fd
;
455 struct lttng_poll_event events
;
456 struct lttcomm_sock
*control_sock
, *data_sock
;
459 * Get allocated in this thread, enqueued to a global queue, dequeued and
460 * freed in the worker thread.
462 struct relay_command
*relay_cmd
= NULL
;
464 DBG("[thread] Relay listener started");
466 control_sock
= relay_init_sock(control_uri
);
471 data_sock
= relay_init_sock(data_uri
);
477 * Pass 3 as size here for the thread quit pipe, control and data socket.
479 ret
= create_thread_poll_set(&events
, 3);
481 goto error_create_poll
;
484 /* Add the control socket */
485 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
490 /* Add the data socket */
491 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
497 DBG("Listener accepting connections");
499 nb_fd
= LTTNG_POLL_GETNB(&events
);
502 ret
= lttng_poll_wait(&events
, -1);
505 * Restart interrupted system call.
507 if (errno
== EINTR
) {
513 DBG("Relay new connection received");
514 for (i
= 0; i
< nb_fd
; i
++) {
515 /* Fetch once the poll data */
516 revents
= LTTNG_POLL_GETEV(&events
, i
);
517 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
519 /* Thread quit pipe has been closed. Killing thread. */
520 ret
= check_thread_quit_pipe(pollfd
, revents
);
525 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
526 ERR("socket poll error");
528 } else if (revents
& LPOLLIN
) {
529 struct lttcomm_sock
*newsock
= NULL
;
531 relay_cmd
= zmalloc(sizeof(struct relay_command
));
532 if (relay_cmd
== NULL
) {
533 PERROR("relay command zmalloc");
537 if (pollfd
== data_sock
->fd
) {
538 newsock
= data_sock
->ops
->accept(data_sock
);
540 PERROR("accepting data sock");
543 relay_cmd
->type
= RELAY_DATA
;
544 DBG("Relay data connection accepted, socket %d", newsock
->fd
);
545 } else if (pollfd
== control_sock
->fd
) {
546 newsock
= control_sock
->ops
->accept(control_sock
);
548 PERROR("accepting control sock");
551 relay_cmd
->type
= RELAY_CONTROL
;
552 DBG("Relay control connection accepted, socket %d", newsock
->fd
);
554 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
,
557 PERROR("setsockopt inet");
560 relay_cmd
->sock
= newsock
;
562 * Lock free enqueue the request.
564 cds_wfq_enqueue(&relay_cmd_queue
.queue
, &relay_cmd
->node
);
567 * Wake the dispatch queue futex. Implicit memory
568 * barrier with the exchange in cds_wfq_enqueue.
570 futex_nto1_wake(&relay_cmd_queue
.futex
);
577 lttng_poll_clean(&events
);
579 if (control_sock
->fd
>= 0) {
580 ret
= control_sock
->ops
->close(control_sock
);
584 lttcomm_destroy_sock(control_sock
);
586 if (data_sock
->fd
>= 0) {
587 ret
= data_sock
->ops
->close(data_sock
);
591 lttcomm_destroy_sock(data_sock
);
594 DBG("Relay listener thread cleanup complete");
601 * This thread manages the dispatching of the requests to worker threads
604 void *relay_thread_dispatcher(void *data
)
607 struct cds_wfq_node
*node
;
608 struct relay_command
*relay_cmd
= NULL
;
610 DBG("[thread] Relay dispatcher started");
612 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
613 /* Atomically prepare the queue futex */
614 futex_nto1_prepare(&relay_cmd_queue
.futex
);
617 /* Dequeue commands */
618 node
= cds_wfq_dequeue_blocking(&relay_cmd_queue
.queue
);
620 DBG("Woken up but nothing in the relay command queue");
621 /* Continue thread execution */
625 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
626 DBG("Dispatching request waiting on sock %d", relay_cmd
->sock
->fd
);
629 * Inform worker thread of the new request. This
630 * call is blocking so we can be assured that the data will be read
631 * at some point in time or wait to the end of the world :)
634 ret
= write(relay_cmd_pipe
[1], relay_cmd
,
635 sizeof(struct relay_command
));
636 } while (ret
< 0 && errno
== EINTR
);
639 PERROR("write cmd pipe");
642 } while (node
!= NULL
);
644 /* Futex wait on queue. Blocking call on futex() */
645 futex_nto1_wait(&relay_cmd_queue
.futex
);
649 DBG("Dispatch thread dying");
655 * Return the realpath(3) of the path even if the last directory token does not
656 * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the
657 * /tmp/test1 does, the real path is returned. In normal time, realpath(3)
658 * fails if the end point directory does not exist.
661 char *expand_full_path(const char *path
)
663 const char *end_path
= path
;
664 char *next
, *cut_path
, *expanded_path
;
666 /* Find last token delimited by '/' */
667 while ((next
= strpbrk(end_path
+ 1, "/"))) {
671 /* Cut last token from original path */
672 cut_path
= strndup(path
, end_path
- path
);
674 expanded_path
= malloc(PATH_MAX
);
675 if (expanded_path
== NULL
) {
679 expanded_path
= realpath((char *)cut_path
, expanded_path
);
680 if (expanded_path
== NULL
) {
683 ERR("%s: No such file or directory", cut_path
);
692 /* Add end part to expanded path */
693 strcat(expanded_path
, end_path
);
696 return expanded_path
;
705 * config_get_default_path
707 * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer.
710 char *config_get_default_path(void)
712 return getenv("HOME");
716 * Create recursively directory using the FULL path.
719 int mkdir_recursive(char *path
, mode_t mode
)
721 char *p
, tmp
[PATH_MAX
];
726 ret
= snprintf(tmp
, sizeof(tmp
), "%s", path
);
728 PERROR("snprintf mkdir");
733 if (tmp
[len
- 1] == '/') {
737 for (p
= tmp
+ 1; *p
; p
++) {
740 if (tmp
[strlen(tmp
) - 1] == '.' &&
741 tmp
[strlen(tmp
) - 2] == '.' &&
742 tmp
[strlen(tmp
) - 3] == '/') {
743 ERR("Using '/../' is not permitted in the trace path (%s)",
748 ret
= stat(tmp
, &statbuf
);
750 ret
= mkdir(tmp
, mode
);
752 if (!(errno
== EEXIST
)) {
753 PERROR("mkdir recursive");
763 ret
= mkdir(tmp
, mode
);
765 if (!(errno
== EEXIST
)) {
766 PERROR("mkdir recursive last piece");
778 * create_output_path: create the output trace directory
781 char *create_output_path(char *path_name
)
784 char *alloc_path
= NULL
;
785 char *traces_path
= NULL
;
786 char *full_path
= NULL
;
788 /* Auto output path */
789 if (opt_output_path
== NULL
) {
790 alloc_path
= strdup(config_get_default_path());
791 if (alloc_path
== NULL
) {
792 ERR("Home path not found.\n \
793 Please specify an output path using -o, --output PATH");
798 ret
= asprintf(&traces_path
, "%s/" DEFAULT_TRACE_DIR_NAME
799 "/%s", alloc_path
, path_name
);
801 PERROR("asprintf trace dir name");
805 full_path
= expand_full_path(opt_output_path
);
806 ret
= asprintf(&traces_path
, "%s/%s", full_path
, path_name
);
808 PERROR("asprintf trace dir name");
820 * relay_delete_session: Free all memory associated with a session and
824 void relay_delete_session(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
826 struct lttng_ht_iter iter
;
827 struct lttng_ht_node_ulong
*node
;
828 struct relay_stream
*stream
;
834 DBG("Relay deleting session %lu", cmd
->session
->id
);
835 free(cmd
->session
->sock
);
837 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, node
, node
) {
838 node
= lttng_ht_iter_get_node_ulong(&iter
);
840 stream
= caa_container_of(node
,
841 struct relay_stream
, stream_n
);
842 if (stream
->session
== cmd
->session
) {
844 ret
= lttng_ht_del(streams_ht
, &iter
);
853 * relay_add_stream: allocate a new stream for a session
856 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
857 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
859 struct relay_session
*session
= cmd
->session
;
860 struct lttcomm_relayd_add_stream stream_info
;
861 struct relay_stream
*stream
= NULL
;
862 struct lttcomm_relayd_status_stream reply
;
863 char *path
= NULL
, *root_path
= NULL
;
866 if (!session
|| session
->version_check_done
== 0) {
867 ERR("Trying to add a stream before version check");
872 /* FIXME : use data_size for something ? */
873 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
874 sizeof(struct lttcomm_relayd_add_stream
), MSG_WAITALL
);
875 if (ret
< sizeof(struct lttcomm_relayd_add_stream
)) {
876 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
880 stream
= zmalloc(sizeof(struct relay_stream
));
881 if (stream
== NULL
) {
882 PERROR("relay stream zmalloc");
887 stream
->stream_handle
= ++last_relay_stream_id
;
889 stream
->session
= session
;
891 root_path
= create_output_path(stream_info
.pathname
);
896 ret
= mkdir_recursive(root_path
, S_IRWXU
| S_IRWXG
);
899 ERR("relay creating output directory");
903 ret
= asprintf(&path
, "%s/%s", root_path
, stream_info
.channel_name
);
905 PERROR("asprintf stream path");
909 ret
= open(path
, O_WRONLY
|O_CREAT
|O_TRUNC
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
911 PERROR("Relay creating trace file");
916 DBG("Tracefile %s created", path
);
918 lttng_ht_node_init_ulong(&stream
->stream_n
,
919 (unsigned long) stream
->stream_handle
);
920 lttng_ht_add_unique_ulong(streams_ht
,
923 DBG("Relay new stream added %s", stream_info
.channel_name
);
928 /* send the session id to the client or a negative return code on error */
930 reply
.ret_code
= htobe32(LTTCOMM_ERR
);
932 reply
.ret_code
= htobe32(LTTCOMM_OK
);
934 reply
.handle
= htobe64(stream
->stream_handle
);
935 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
936 sizeof(struct lttcomm_relayd_status_stream
), 0);
938 ERR("Relay sending stream id");
946 * relay_unknown_command: send -1 if received unknown command
949 void relay_unknown_command(struct relay_command
*cmd
)
951 struct lttcomm_relayd_generic_reply reply
;
954 reply
.ret_code
= htobe32(LTTCOMM_ERR
);
955 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
956 sizeof(struct lttcomm_relayd_generic_reply
), 0);
958 ERR("Relay sending unknown command");
963 * relay_start: send an acknowledgment to the client to tell if we are
964 * ready to receive data. We are ready if a session is established.
967 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
968 struct relay_command
*cmd
)
970 int ret
= htobe32(LTTCOMM_OK
);
971 struct lttcomm_relayd_generic_reply reply
;
972 struct relay_session
*session
= cmd
->session
;
975 DBG("Trying to start the streaming without a session established");
976 ret
= htobe32(LTTCOMM_ERR
);
979 reply
.ret_code
= ret
;
980 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
981 sizeof(struct lttcomm_relayd_generic_reply
), 0);
983 ERR("Relay sending start ack");
990 * Get stream from stream id.
993 struct relay_stream
*relay_stream_from_stream_id(uint64_t stream_id
,
994 struct lttng_ht
*streams_ht
)
996 struct lttng_ht_node_ulong
*node
;
997 struct lttng_ht_iter iter
;
998 struct relay_stream
*ret
;
1000 lttng_ht_lookup(streams_ht
,
1001 (void *)((unsigned long) stream_id
),
1003 node
= lttng_ht_iter_get_node_ulong(&iter
);
1005 DBG("Relay stream %lu not found", stream_id
);
1010 ret
= caa_container_of(node
, struct relay_stream
, stream_n
);
1017 * relay_recv_metadata: receive the metada for the session.
1020 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1021 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1023 int ret
= htobe32(LTTCOMM_OK
);
1024 struct relay_session
*session
= cmd
->session
;
1025 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1026 struct relay_stream
*metadata_stream
;
1027 uint64_t data_size
, payload_size
;
1030 ERR("Metadata sent before version check");
1035 data_size
= be64toh(recv_hdr
->data_size
);
1036 payload_size
= data_size
- sizeof(uint64_t);
1037 if (data_buffer_size
< data_size
) {
1038 data_buffer
= realloc(data_buffer
, data_size
);
1040 ERR("Allocating data buffer");
1044 data_buffer_size
= data_size
;
1046 memset(data_buffer
, 0, data_size
);
1047 DBG2("Relay receiving metadata, waiting for %lu bytes", data_size
);
1048 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, MSG_WAITALL
);
1049 if (ret
< 0 || ret
!= data_size
) {
1051 ERR("Relay didn't receive the whole metadata");
1054 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1055 metadata_stream
= relay_stream_from_stream_id(
1056 be64toh(metadata_struct
->stream_id
), streams_ht
);
1057 if (!metadata_stream
) {
1063 ret
= write(metadata_stream
->fd
, metadata_struct
->payload
,
1065 } while (ret
< 0 && errno
== EINTR
);
1066 if (ret
< (payload_size
)) {
1067 ERR("Relay error writing metadata on file");
1071 DBG2("Relay metadata written");
1078 * relay_send_version: send relayd version number
1081 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1082 struct relay_command
*cmd
)
1084 int ret
= htobe32(LTTCOMM_OK
);
1085 struct lttcomm_relayd_version reply
;
1086 struct relay_session
*session
= NULL
;
1088 if (cmd
->session
== NULL
) {
1089 session
= zmalloc(sizeof(struct relay_session
));
1090 if (session
== NULL
) {
1091 PERROR("relay session zmalloc");
1095 session
->id
= ++last_relay_session_id
;
1096 DBG("Created session %lu", session
->id
);
1097 cmd
->session
= session
;
1099 session
->version_check_done
= 1;
1101 sscanf(VERSION
, "%u.%u", &reply
.major
, &reply
.minor
);
1102 reply
.major
= htobe32(reply
.major
);
1103 reply
.minor
= htobe32(reply
.minor
);
1104 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1105 sizeof(struct lttcomm_relayd_version
), 0);
1107 ERR("Relay sending version");
1109 DBG("Version check done");
1116 * relay_process_control: Process the commands received on the control socket
1119 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1120 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1124 switch (be32toh(recv_hdr
->cmd
)) {
1126 case RELAYD_CREATE_SESSION:
1127 ret = relay_create_session(recv_hdr, cmd);
1130 case RELAYD_ADD_STREAM
:
1131 ret
= relay_add_stream(recv_hdr
, cmd
, streams_ht
);
1133 case RELAYD_START_DATA
:
1134 ret
= relay_start(recv_hdr
, cmd
);
1136 case RELAYD_SEND_METADATA
:
1137 ret
= relay_recv_metadata(recv_hdr
, cmd
, streams_ht
);
1139 case RELAYD_VERSION
:
1140 ret
= relay_send_version(recv_hdr
, cmd
);
1142 case RELAYD_UPDATE_SYNC_INFO
:
1144 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
1145 relay_unknown_command(cmd
);
1155 * relay_process_data: Process the data received on the data socket
1158 int relay_process_data(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1161 struct relay_stream
*stream
;
1162 struct lttcomm_relayd_data_hdr data_hdr
;
1166 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &data_hdr
,
1167 sizeof(struct lttcomm_relayd_data_hdr
), MSG_WAITALL
);
1169 ERR("Connections seems to be closed");
1174 stream_id
= be64toh(data_hdr
.stream_id
);
1175 stream
= relay_stream_from_stream_id(stream_id
, streams_ht
);
1181 data_size
= be32toh(data_hdr
.data_size
);
1182 if (data_buffer_size
< data_size
) {
1183 data_buffer
= realloc(data_buffer
, data_size
);
1185 ERR("Allocating data buffer");
1189 data_buffer_size
= data_size
;
1191 memset(data_buffer
, 0, data_size
);
1193 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, MSG_WAITALL
);
1200 ret
= write(stream
->fd
, data_buffer
, data_size
);
1201 } while (ret
< 0 && errno
== EINTR
);
1202 if (ret
< data_size
) {
1203 ERR("Relay error writing data to file");
1207 DBG2("Relay wrote %d bytes to tracefile for stream id %lu", ret
, stream
->stream_handle
);
1214 void relay_cleanup_connection(struct lttng_ht
*relay_connections_ht
, struct lttng_poll_event
*events
,
1215 struct lttng_ht
*streams_ht
, int pollfd
, struct lttng_ht_iter
*iter
)
1219 ret
= lttng_ht_del(relay_connections_ht
, iter
);
1221 lttng_poll_del(events
, pollfd
);
1223 ret
= close(pollfd
);
1225 ERR("Closing pollfd %d", pollfd
);
1230 int relay_add_connection(int fd
, struct lttng_poll_event
*events
,
1231 struct lttng_ht
*relay_connections_ht
)
1234 struct relay_command
*relay_connection
;
1236 relay_connection
= zmalloc(sizeof(struct relay_command
));
1237 if (relay_connection
== NULL
) {
1238 PERROR("Relay command zmalloc");
1242 ret
= read(fd
, relay_connection
, sizeof(struct relay_command
));
1243 if (ret
< 0 || ret
< sizeof(relay_connection
)) {
1244 PERROR("read relay cmd pipe");
1249 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
1250 (unsigned long) relay_connection
->sock
->fd
);
1251 lttng_ht_add_unique_ulong(relay_connections_ht
,
1252 &relay_connection
->sock_n
);
1253 ret
= lttng_poll_add(events
,
1254 relay_connection
->sock
->fd
,
1255 LPOLLIN
| LPOLLRDHUP
);
1262 * This thread does the actual work
1265 void *relay_thread_worker(void *data
)
1268 uint32_t revents
, nb_fd
;
1269 struct relay_command
*relay_connection
;
1270 struct lttng_poll_event events
;
1271 struct lttng_ht
*relay_connections_ht
;
1272 struct lttng_ht_node_ulong
*node
;
1273 struct lttng_ht_iter iter
;
1274 struct lttng_ht
*streams_ht
;
1275 struct lttcomm_relayd_hdr recv_hdr
;
1277 DBG("[thread] Relay worker started");
1279 /* table of connections indexed on socket */
1280 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1282 /* tables of streams indexed by stream ID */
1283 streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1285 ret
= create_thread_poll_set(&events
, 2);
1287 goto error_poll_create
;
1290 ret
= lttng_poll_add(&events
, relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1296 /* Zeroed the events structure */
1297 lttng_poll_reset(&events
);
1299 nb_fd
= LTTNG_POLL_GETNB(&events
);
1301 /* Infinite blocking call, waiting for transmission */
1303 ret
= lttng_poll_wait(&events
, -1);
1306 * Restart interrupted system call.
1308 if (errno
== EINTR
) {
1314 for (i
= 0; i
< nb_fd
; i
++) {
1315 /* Fetch once the poll data */
1316 revents
= LTTNG_POLL_GETEV(&events
, i
);
1317 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1319 /* Thread quit pipe has been closed. Killing thread. */
1320 ret
= check_thread_quit_pipe(pollfd
, revents
);
1325 /* Inspect the relay cmd pipe for new connection */
1326 if (pollfd
== relay_cmd_pipe
[0]) {
1327 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1328 ERR("Relay pipe error");
1330 } else if (revents
& LPOLLIN
) {
1331 DBG("Relay command received");
1332 ret
= relay_add_connection(relay_cmd_pipe
[0],
1333 &events
, relay_connections_ht
);
1338 } else if (revents
> 0) {
1339 lttng_ht_lookup(relay_connections_ht
,
1340 (void *)((unsigned long) pollfd
),
1342 node
= lttng_ht_iter_get_node_ulong(&iter
);
1344 DBG2("Relay sock %d not found", pollfd
);
1347 relay_connection
= caa_container_of(node
,
1348 struct relay_command
, sock_n
);
1350 if (revents
& (LPOLLERR
)) {
1352 relay_cleanup_connection(relay_connections_ht
,
1353 &events
, streams_ht
, pollfd
, &iter
);
1354 free(relay_connection
);
1355 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
1356 DBG("Socket %d hung up", pollfd
);
1357 relay_cleanup_connection(relay_connections_ht
,
1358 &events
, streams_ht
, pollfd
, &iter
);
1359 if (relay_connection
->type
== RELAY_CONTROL
) {
1360 relay_delete_session(relay_connection
, streams_ht
);
1362 free(relay_connection
);
1363 } else if (revents
& LPOLLIN
) {
1364 /* control socket */
1365 if (relay_connection
->type
== RELAY_CONTROL
) {
1366 ret
= relay_connection
->sock
->ops
->recvmsg(
1367 relay_connection
->sock
, &recv_hdr
,
1368 sizeof(struct lttcomm_relayd_hdr
), MSG_WAITALL
);
1369 /* connection closed */
1371 relay_cleanup_connection(relay_connections_ht
,
1372 &events
, streams_ht
, pollfd
, &iter
);
1373 relay_delete_session(relay_connection
, streams_ht
);
1374 free(relay_connection
);
1375 DBG("Control connection closed with %d", pollfd
);
1377 if (relay_connection
->session
) {
1378 DBG2("Relay worker receiving data for session : %lu",
1379 relay_connection
->session
->id
);
1381 ret
= relay_process_control(&recv_hdr
,
1385 * there was an error in processing a control
1386 * command: clear the session
1389 relay_cleanup_connection(relay_connections_ht
,
1390 &events
, streams_ht
, pollfd
, &iter
);
1391 free(relay_connection
);
1392 DBG("Connection closed with %d", pollfd
);
1396 } else if (relay_connection
->type
== RELAY_DATA
) {
1397 ret
= relay_process_data(relay_connection
, streams_ht
);
1398 /* connection closed */
1400 relay_cleanup_connection(relay_connections_ht
,
1401 &events
, streams_ht
, pollfd
, &iter
);
1402 relay_delete_session(relay_connection
, streams_ht
);
1403 DBG("Data connection closed with %d", pollfd
);
1412 lttng_poll_clean(&events
);
1414 /* empty the hash table and free the memory */
1415 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
1416 node
= lttng_ht_iter_get_node_ulong(&iter
);
1418 relay_connection
= caa_container_of(node
,
1419 struct relay_command
, sock_n
);
1420 free(relay_connection
);
1422 ret
= lttng_ht_del(relay_connections_ht
, &iter
);
1427 lttng_ht_destroy(relay_connections_ht
);
1428 DBG("Worker thread cleanup complete");
1434 * Create the relay command pipe to wake thread_manage_apps.
1435 * Closed in cleanup().
1437 static int create_relay_cmd_pipe(void)
1441 ret
= utils_create_pipe_cloexec(relay_cmd_pipe
);
1449 int main(int argc
, char **argv
)
1454 /* Create thread quit pipe */
1455 if ((ret
= init_thread_quit_pipe()) < 0) {
1459 /* Parse arguments */
1461 if ((ret
= parse_args(argc
, argv
) < 0)) {
1465 if ((ret
= set_signal_handler()) < 0) {
1478 /* Check if daemon is UID = 0 */
1479 is_root
= !getuid();
1482 if (control_uri
->port
< 1024 || data_uri
->port
< 1024) {
1483 ERR("Need to be root to use ports < 1024");
1489 /* Setup the thread apps communication pipe. */
1490 if ((ret
= create_relay_cmd_pipe()) < 0) {
1494 /* Init relay command queue. */
1495 cds_wfq_init(&relay_cmd_queue
.queue
);
1497 /* Set up max poll set size */
1498 lttng_poll_set_max_size();
1500 /* Setup the dispatcher thread */
1501 ret
= pthread_create(&dispatcher_thread
, NULL
,
1502 relay_thread_dispatcher
, (void *) NULL
);
1504 PERROR("pthread_create dispatcher");
1505 goto exit_dispatcher
;
1508 /* Setup the worker thread */
1509 ret
= pthread_create(&worker_thread
, NULL
,
1510 relay_thread_worker
, (void *) NULL
);
1512 PERROR("pthread_create worker");
1516 /* Setup the listener thread */
1517 ret
= pthread_create(&listener_thread
, NULL
,
1518 relay_thread_listener
, (void *) NULL
);
1520 PERROR("pthread_create listener");
1525 ret
= pthread_join(listener_thread
, &status
);
1527 PERROR("pthread_join");
1528 goto error
; /* join error, exit without cleanup */
1532 ret
= pthread_join(worker_thread
, &status
);
1534 PERROR("pthread_join");
1535 goto error
; /* join error, exit without cleanup */
1539 ret
= pthread_join(dispatcher_thread
, &status
);
1541 PERROR("pthread_join");
1542 goto error
; /* join error, exit without cleanup */