-/*
- * Copyright (C) 2012 Julien Desfossez <jdesfossez@efficios.com>
- * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
- * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/mman.h>
-#include <sys/mount.h>
-#include <sys/resource.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/resource.h>
-#include <inttypes.h>
-#include <urcu/futex.h>
-#include <urcu/uatomic.h>
-#include <urcu/rculist.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <strings.h>
-#include <ctype.h>
-
-#include <lttng/lttng.h>
-#include <common/common.h>
-#include <common/compat/poll.h>
-#include <common/compat/socket.h>
-#include <common/compat/endian.h>
-#include <common/compat/getenv.h>
-#include <common/defaults.h>
-#include <common/daemonize.h>
-#include <common/futex.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/sessiond-comm/inet.h>
-#include <common/sessiond-comm/relayd.h>
-#include <common/uri.h>
-#include <common/utils.h>
-#include <common/align.h>
-#include <common/config/session-config.h>
-#include <common/dynamic-buffer.h>
-#include <common/buffer-view.h>
-#include <common/string-utils/format.h>
-#include <common/fd-tracker/fd-tracker.h>
-#include <common/fd-tracker/utils.h>
-
-#include "backward-compatibility-group-by.h"
-#include "cmd.h"
-#include "connection.h"
-#include "ctf-trace.h"
-#include "health-relayd.h"
-#include "index.h"
-#include "live.h"
-#include "lttng-relayd.h"
-#include "session.h"
-#include "sessiond-trace-chunks.h"
-#include "stream.h"
-#include "tcp_keep_alive.h"
-#include "testpoint.h"
-#include "tracefile-array.h"
-#include "utils.h"
-#include "version.h"
-#include "viewer-stream.h"
-
-static const char *help_msg =
-#ifdef LTTNG_EMBED_HELP
-#include <lttng-relayd.8.h>
-#else
-NULL
-#endif
-;
-
-enum relay_connection_status {
- RELAY_CONNECTION_STATUS_OK,
- /* An error occurred while processing an event on the connection. */
- RELAY_CONNECTION_STATUS_ERROR,
- /* Connection closed/shutdown cleanly. */
- RELAY_CONNECTION_STATUS_CLOSED,
-};
-
-/* command line options */
-char *opt_output_path, *opt_working_directory;
-static int opt_daemon, opt_background, opt_print_version, opt_allow_clear = 1;
-enum relay_group_output_by opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_UNKNOWN;
-
-/*
- * We need to wait for listener and live listener threads, as well as
- * health check thread, before being ready to signal readiness.
- */
-#define NR_LTTNG_RELAY_READY 3
-static int lttng_relay_ready = NR_LTTNG_RELAY_READY;
-
-/* Size of receive buffer. */
-#define RECV_DATA_BUFFER_SIZE 65536
-
-static int recv_child_signal; /* Set to 1 when a SIGUSR1 signal is received. */
-static pid_t child_ppid; /* Internal parent PID use with daemonize. */
-
-static struct lttng_uri *control_uri;
-static struct lttng_uri *data_uri;
-static struct lttng_uri *live_uri;
-
-const char *progname;
-
-const char *tracing_group_name = DEFAULT_TRACING_GROUP;
-static int tracing_group_name_override;
-
-const char * const config_section_name = "relayd";
-
-/*
- * Quit pipe for all threads. This permits a single cancellation point
- * for all threads when receiving an event on the pipe.
- */
-int thread_quit_pipe[2] = { -1, -1 };
-
-/*
- * This pipe is used to inform the worker thread that a command is queued and
- * ready to be processed.
- */
-static int relay_conn_pipe[2] = { -1, -1 };
-
-/* Shared between threads */
-static int dispatch_thread_exit;
-
-static pthread_t listener_thread;
-static pthread_t dispatcher_thread;
-static pthread_t worker_thread;
-static pthread_t health_thread;
-
-/*
- * last_relay_stream_id_lock protects last_relay_stream_id increment
- * atomicity on 32-bit architectures.
- */
-static pthread_mutex_t last_relay_stream_id_lock = PTHREAD_MUTEX_INITIALIZER;
-static uint64_t last_relay_stream_id;
-
-/*
- * Relay command queue.
- *
- * The relay_thread_listener and relay_thread_dispatcher communicate with this
- * queue.
- */
-static struct relay_conn_queue relay_conn_queue;
-
-/* Cap of file desriptors to be in simultaneous use by the relay daemon. */
-static unsigned int lttng_opt_fd_pool_size = -1;
-
-/* Global relay stream hash table. */
-struct lttng_ht *relay_streams_ht;
-
-/* Global relay viewer stream hash table. */
-struct lttng_ht *viewer_streams_ht;
-
-/* Global relay sessions hash table. */
-struct lttng_ht *sessions_ht;
-
-/* Relayd health monitoring */
-struct health_app *health_relayd;
-
-struct sessiond_trace_chunk_registry *sessiond_trace_chunk_registry;
-
-/* Global fd tracker. */
-struct fd_tracker *the_fd_tracker;
-
-static struct option long_options[] = {
- { "control-port", 1, 0, 'C', },
- { "data-port", 1, 0, 'D', },
- { "live-port", 1, 0, 'L', },
- { "daemonize", 0, 0, 'd', },
- { "background", 0, 0, 'b', },
- { "group", 1, 0, 'g', },
- { "fd-pool-size", 1, 0, '\0', },
- { "help", 0, 0, 'h', },
- { "output", 1, 0, 'o', },
- { "verbose", 0, 0, 'v', },
- { "config", 1, 0, 'f' },
- { "version", 0, 0, 'V' },
- { "working-directory", 1, 0, 'w', },
- { "group-output-by-session", 0, 0, 's', },
- { "group-output-by-host", 0, 0, 'p', },
- { "disallow-clear", 0, 0, 'x' },
- { NULL, 0, 0, 0, },
-};
-
-static const char *config_ignore_options[] = { "help", "config", "version" };
-
-static void print_version(void) {
- fprintf(stdout, "%s\n", VERSION);
-}
-
-static void relayd_config_log(void)
-{
- DBG("LTTng-relayd " VERSION " - " VERSION_NAME "%s%s",
- GIT_VERSION[0] == '\0' ? "" : " - " GIT_VERSION,
- EXTRA_VERSION_NAME[0] == '\0' ? "" : " - " EXTRA_VERSION_NAME);
- if (EXTRA_VERSION_DESCRIPTION[0] != '\0') {
- DBG("LTTng-relayd extra version description:\n\t" EXTRA_VERSION_DESCRIPTION "\n");
- }
- if (EXTRA_VERSION_PATCHES[0] != '\0') {
- DBG("LTTng-relayd extra patches:\n\t" EXTRA_VERSION_PATCHES "\n");
- }
-}
-
-/*
- * Take an option from the getopt output and set it in the right variable to be
- * used later.
- *
- * Return 0 on success else a negative value.
- */
-static int set_option(int opt, const char *arg, const char *optname)
-{
- int ret;
-
- switch (opt) {
- case 0:
- if (!strcmp(optname, "fd-pool-size")) {
- unsigned long v;
-
- errno = 0;
- v = strtoul(arg, NULL, 0);
- if (errno != 0 || !isdigit((unsigned char) arg[0])) {
- ERR("Wrong value in --fd-pool-size parameter: %s", arg);
- ret = -1;
- goto end;
- }
- if (v >= UINT_MAX) {
- ERR("File descriptor cap overflow in --fd-pool-size parameter: %s", arg);
- ret = -1;
- goto end;
- }
- lttng_opt_fd_pool_size = (unsigned int) v;
- } else {
- fprintf(stderr, "unknown option %s", optname);
- if (arg) {
- fprintf(stderr, " with arg %s\n", arg);
- }
- }
- break;
- case 'C':
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-C, --control-port");
- } else {
- ret = uri_parse(arg, &control_uri);
- if (ret < 0) {
- ERR("Invalid control URI specified");
- goto end;
- }
- if (control_uri->port == 0) {
- control_uri->port = DEFAULT_NETWORK_CONTROL_PORT;
- }
- }
- break;
- case 'D':
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-D, -data-port");
- } else {
- ret = uri_parse(arg, &data_uri);
- if (ret < 0) {
- ERR("Invalid data URI specified");
- goto end;
- }
- if (data_uri->port == 0) {
- data_uri->port = DEFAULT_NETWORK_DATA_PORT;
- }
- }
- break;
- case 'L':
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-L, -live-port");
- } else {
- ret = uri_parse(arg, &live_uri);
- if (ret < 0) {
- ERR("Invalid live URI specified");
- goto end;
- }
- if (live_uri->port == 0) {
- live_uri->port = DEFAULT_NETWORK_VIEWER_PORT;
- }
- }
- break;
- case 'd':
- opt_daemon = 1;
- break;
- case 'b':
- opt_background = 1;
- break;
- case 'g':
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-g, --group");
- } else {
- tracing_group_name = strdup(arg);
- if (tracing_group_name == NULL) {
- ret = -errno;
- PERROR("strdup");
- goto end;
- }
- tracing_group_name_override = 1;
- }
- break;
- case 'h':
- ret = utils_show_help(8, "lttng-relayd", help_msg);
- if (ret) {
- ERR("Cannot show --help for `lttng-relayd`");
- perror("exec");
- }
- exit(EXIT_FAILURE);
- case 'V':
- opt_print_version = 1;
- break;
- case 'o':
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-o, --output");
- } else {
- ret = asprintf(&opt_output_path, "%s", arg);
- if (ret < 0) {
- ret = -errno;
- PERROR("asprintf opt_output_path");
- goto end;
- }
- }
- break;
- case 'w':
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-w, --working-directory");
- } else {
- ret = asprintf(&opt_working_directory, "%s", arg);
- if (ret < 0) {
- ret = -errno;
- PERROR("asprintf opt_working_directory");
- goto end;
- }
- }
- break;
-
- case 'v':
- /* Verbose level can increase using multiple -v */
- if (arg) {
- lttng_opt_verbose = config_parse_value(arg);
- } else {
- /* Only 3 level of verbosity (-vvv). */
- if (lttng_opt_verbose < 3) {
- lttng_opt_verbose += 1;
- }
- }
- break;
- case 's':
- if (opt_group_output_by != RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
- ERR("Cannot set --group-output-by-session, another --group-output-by argument is present");
- exit(EXIT_FAILURE);
- }
- opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_SESSION;
- break;
- case 'p':
- if (opt_group_output_by != RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
- ERR("Cannot set --group-output-by-host, another --group-output-by argument is present");
- exit(EXIT_FAILURE);
- }
- opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
- break;
- case 'x':
- /* Disallow clear */
- opt_allow_clear = 0;
- break;
- default:
- /* Unknown option or other error.
- * Error is printed by getopt, just return */
- ret = -1;
- goto end;
- }
-
- /* All good. */
- ret = 0;
-
-end:
- return ret;
-}
-
-/*
- * config_entry_handler_cb used to handle options read from a config file.
- * See config_entry_handler_cb comment in common/config/session-config.h for the
- * return value conventions.
- */
-static int config_entry_handler(const struct config_entry *entry, void *unused)
-{
- int ret = 0, i;
-
- if (!entry || !entry->name || !entry->value) {
- ret = -EINVAL;
- goto end;
- }
-
- /* Check if the option is to be ignored */
- for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
- if (!strcmp(entry->name, config_ignore_options[i])) {
- goto end;
- }
- }
-
- for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
- /* Ignore if entry name is not fully matched. */
- if (strcmp(entry->name, long_options[i].name)) {
- continue;
- }
-
- /*
- * If the option takes no argument on the command line,
- * we have to check if the value is "true". We support
- * non-zero numeric values, true, on and yes.
- */
- if (!long_options[i].has_arg) {
- ret = config_parse_value(entry->value);
- if (ret <= 0) {
- if (ret) {
- WARN("Invalid configuration value \"%s\" for option %s",
- entry->value, entry->name);
- }
- /* False, skip boolean config option. */
- goto end;
- }
- }
-
- ret = set_option(long_options[i].val, entry->value, entry->name);
- goto end;
- }
-
- WARN("Unrecognized option \"%s\" in daemon configuration file.",
- entry->name);
-
-end:
- return ret;
-}
-
-static int parse_env_options(void)
-{
- int ret = 0;
- char *value = NULL;
-
- value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_WORKING_DIRECTORY_ENV);
- if (value) {
- opt_working_directory = strdup(value);
- if (!opt_working_directory) {
- ERR("Failed to allocate working directory string (\"%s\")",
- value);
- ret = -1;
- }
- }
- return ret;
-}
-
-static int set_fd_pool_size(void)
-{
- int ret = 0;
- struct rlimit rlimit;
-
- ret = getrlimit(RLIMIT_NOFILE, &rlimit);
- if (ret) {
- PERROR("Failed to get file descriptor limit");
- ret = -1;
- goto end;
- }
-
- DBG("File descriptor count limits are %" PRIu64 " (soft) and %" PRIu64 " (hard)",
- (uint64_t) rlimit.rlim_cur,
- (uint64_t) rlimit.rlim_max);
- if (lttng_opt_fd_pool_size == -1) {
- /* Use default value (soft limit - reserve). */
- if (rlimit.rlim_cur < DEFAULT_RELAYD_MIN_FD_POOL_SIZE) {
- ERR("The process' file number limit is too low (%" PRIu64 "). The process' file number limit must be set to at least %i.",
- (uint64_t) rlimit.rlim_cur, DEFAULT_RELAYD_MIN_FD_POOL_SIZE);
- ret = -1;
- goto end;
- }
- lttng_opt_fd_pool_size = rlimit.rlim_cur -
- DEFAULT_RELAYD_FD_POOL_SIZE_RESERVE;
- goto end;
- }
-
- if (lttng_opt_fd_pool_size < DEFAULT_RELAYD_MIN_FD_POOL_SIZE) {
- ERR("File descriptor pool size must be set to at least %d",
- DEFAULT_RELAYD_MIN_FD_POOL_SIZE);
- ret = -1;
- goto end;
- }
-
- if (lttng_opt_fd_pool_size > rlimit.rlim_cur) {
- ERR("File descriptor pool size argument (%u) exceeds the process' soft limit (%" PRIu64 ").",
- lttng_opt_fd_pool_size, (uint64_t) rlimit.rlim_cur);
- ret = -1;
- goto end;
- }
-
- DBG("File descriptor pool size argument (%u) adjusted to %u to accommodates transient fd uses",
- lttng_opt_fd_pool_size,
- lttng_opt_fd_pool_size - DEFAULT_RELAYD_FD_POOL_SIZE_RESERVE);
- lttng_opt_fd_pool_size -= DEFAULT_RELAYD_FD_POOL_SIZE_RESERVE;
-end:
- return ret;
-}
-
-static int set_options(int argc, char **argv)
-{
- int c, ret = 0, option_index = 0, retval = 0;
- int orig_optopt = optopt, orig_optind = optind;
- char *default_address, *optstring;
- char *config_path = NULL;
-
- optstring = utils_generate_optstring(long_options,
- sizeof(long_options) / sizeof(struct option));
- if (!optstring) {
- retval = -ENOMEM;
- goto exit;
- }
-
- /* Check for the --config option */
-
- while ((c = getopt_long(argc, argv, optstring, long_options,
- &option_index)) != -1) {
- if (c == '?') {
- retval = -EINVAL;
- goto exit;
- } else if (c != 'f') {
- continue;
- }
-
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-f, --config");
- } else {
- free(config_path);
- config_path = utils_expand_path(optarg);
- if (!config_path) {
- ERR("Failed to resolve path: %s", optarg);
- }
- }
- }
-
- ret = config_get_section_entries(config_path, config_section_name,
- config_entry_handler, NULL);
- if (ret) {
- if (ret > 0) {
- ERR("Invalid configuration option at line %i", ret);
- }
- retval = -1;
- goto exit;
- }
-
- /* Reset getopt's global state */
- optopt = orig_optopt;
- optind = orig_optind;
- while (1) {
- c = getopt_long(argc, argv, optstring, long_options, &option_index);
- if (c == -1) {
- break;
- }
-
- ret = set_option(c, optarg, long_options[option_index].name);
- if (ret < 0) {
- retval = -1;
- goto exit;
- }
- }
-
- /* assign default values */
- if (control_uri == NULL) {
- ret = asprintf(&default_address,
- "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS ":%d",
- DEFAULT_NETWORK_CONTROL_PORT);
- if (ret < 0) {
- PERROR("asprintf default data address");
- retval = -1;
- goto exit;
- }
-
- ret = uri_parse(default_address, &control_uri);
- free(default_address);
- if (ret < 0) {
- ERR("Invalid control URI specified");
- retval = -1;
- goto exit;
- }
- }
- if (data_uri == NULL) {
- ret = asprintf(&default_address,
- "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS ":%d",
- DEFAULT_NETWORK_DATA_PORT);
- if (ret < 0) {
- PERROR("asprintf default data address");
- retval = -1;
- goto exit;
- }
-
- ret = uri_parse(default_address, &data_uri);
- free(default_address);
- if (ret < 0) {
- ERR("Invalid data URI specified");
- retval = -1;
- goto exit;
- }
- }
- if (live_uri == NULL) {
- ret = asprintf(&default_address,
- "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS ":%d",
- DEFAULT_NETWORK_VIEWER_PORT);
- if (ret < 0) {
- PERROR("asprintf default viewer control address");
- retval = -1;
- goto exit;
- }
-
- ret = uri_parse(default_address, &live_uri);
- free(default_address);
- if (ret < 0) {
- ERR("Invalid viewer control URI specified");
- retval = -1;
- goto exit;
- }
- }
- ret = set_fd_pool_size();
- if (ret) {
- retval = -1;
- goto exit;
- }
-
- if (opt_group_output_by == RELAYD_GROUP_OUTPUT_BY_UNKNOWN) {
- opt_group_output_by = RELAYD_GROUP_OUTPUT_BY_HOST;
- }
- if (opt_allow_clear) {
- /* Check if env variable exists. */
- const char *value = lttng_secure_getenv(DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
- if (value) {
- ret = config_parse_value(value);
- if (ret < 0) {
- ERR("Invalid value for %s specified", DEFAULT_LTTNG_RELAYD_DISALLOW_CLEAR_ENV);
- retval = -1;
- goto exit;
- }
- opt_allow_clear = !ret;
- }
- }
-
-exit:
- free(config_path);
- free(optstring);
- return retval;
-}
-
-static void print_global_objects(void)
-{
- print_viewer_streams();
- print_relay_streams();
- print_sessions();
-}
-
-static int noop_close(void *data, int *fds)
-{
- return 0;
-}
-
-static void untrack_stdio(void)
-{
- int fds[] = { fileno(stdout), fileno(stderr) };
-
- /*
- * noop_close is used since we don't really want to close
- * the stdio output fds; we merely want to stop tracking them.
- */
- (void) fd_tracker_close_unsuspendable_fd(the_fd_tracker,
- fds, 2, noop_close, NULL);
-}
-
-/*
- * Cleanup the daemon
- */
-static void relayd_cleanup(void)
-{
- print_global_objects();
-
- DBG("Cleaning up");
-
- if (viewer_streams_ht)
- lttng_ht_destroy(viewer_streams_ht);
- if (relay_streams_ht)
- lttng_ht_destroy(relay_streams_ht);
- if (sessions_ht)
- lttng_ht_destroy(sessions_ht);
-
- free(opt_output_path);
- free(opt_working_directory);
-
- if (health_relayd) {
- health_app_destroy(health_relayd);
- }
- /* Close thread quit pipes */
- if (health_quit_pipe[0] != -1) {
- (void) fd_tracker_util_pipe_close(
- the_fd_tracker, health_quit_pipe);
- }
- if (thread_quit_pipe[0] != -1) {
- (void) fd_tracker_util_pipe_close(
- the_fd_tracker, thread_quit_pipe);
- }
- if (sessiond_trace_chunk_registry) {
- sessiond_trace_chunk_registry_destroy(
- sessiond_trace_chunk_registry);
- }
- if (the_fd_tracker) {
- untrack_stdio();
- /*
- * fd_tracker_destroy() will log the contents of the fd-tracker
- * if a leak is detected.
- */
- fd_tracker_destroy(the_fd_tracker);
- }
-
- uri_free(control_uri);
- uri_free(data_uri);
- /* Live URI is freed in the live thread. */
-
- if (tracing_group_name_override) {
- free((void *) tracing_group_name);
- }
-}
-
-/*
- * Write to writable pipe used to notify a thread.
- */
-static int notify_thread_pipe(int wpipe)
-{
- ssize_t ret;
-
- ret = lttng_write(wpipe, "!", 1);
- if (ret < 1) {
- PERROR("write poll pipe");
- goto end;
- }
- ret = 0;
-end:
- return ret;
-}
-
-static int notify_health_quit_pipe(int *pipe)
-{
- ssize_t ret;
-
- ret = lttng_write(pipe[1], "4", 1);
- if (ret < 1) {
- PERROR("write relay health quit");
- goto end;
- }
- ret = 0;
-end:
- return ret;
-}
-
-/*
- * Stop all relayd and relayd-live threads.
- */
-int lttng_relay_stop_threads(void)
-{
- int retval = 0;
-
- /* Stopping all threads */
- DBG("Terminating all threads");
- if (notify_thread_pipe(thread_quit_pipe[1])) {
- ERR("write error on thread quit pipe");
- retval = -1;
- }
-
- if (notify_health_quit_pipe(health_quit_pipe)) {
- ERR("write error on health quit pipe");
- }
-
- /* Dispatch thread */
- CMM_STORE_SHARED(dispatch_thread_exit, 1);
- futex_nto1_wake(&relay_conn_queue.futex);
-
- if (relayd_live_stop()) {
- ERR("Error stopping live threads");
- retval = -1;
- }
- return retval;
-}
-
-/*
- * Signal handler for the daemon
- *
- * Simply stop all worker threads, leaving main() return gracefully after
- * joining all threads and calling cleanup().
- */
-static void sighandler(int sig)
-{
- switch (sig) {
- case SIGINT:
- DBG("SIGINT caught");
- if (lttng_relay_stop_threads()) {
- ERR("Error stopping threads");
- }
- break;
- case SIGTERM:
- DBG("SIGTERM caught");
- if (lttng_relay_stop_threads()) {
- ERR("Error stopping threads");
- }
- break;
- case SIGUSR1:
- CMM_STORE_SHARED(recv_child_signal, 1);
- break;
- default:
- break;
- }
-}
-
-/*
- * Setup signal handler for :
- * SIGINT, SIGTERM, SIGPIPE
- */
-static int set_signal_handler(void)
-{
- int ret = 0;
- struct sigaction sa;
- sigset_t sigset;
-
- if ((ret = sigemptyset(&sigset)) < 0) {
- PERROR("sigemptyset");
- return ret;
- }
-
- sa.sa_mask = sigset;
- sa.sa_flags = 0;
-
- sa.sa_handler = sighandler;
- if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- sa.sa_handler = SIG_IGN;
- if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
-
- return ret;
-}
-
-void lttng_relay_notify_ready(void)
-{
- /* Notify the parent of the fork() process that we are ready. */
- if (opt_daemon || opt_background) {
- if (uatomic_sub_return(<tng_relay_ready, 1) == 0) {
- kill(child_ppid, SIGUSR1);
- }
- }
-}
-
-/*
- * Init thread quit pipe.
- *
- * Return -1 on error or 0 if all pipes are created.
- */
-static int init_thread_quit_pipe(void)
-{
- return fd_tracker_util_pipe_open_cloexec(
- the_fd_tracker, "Quit pipe", thread_quit_pipe);
-}
-
-/*
- * Init health quit pipe.
- *
- * Return -1 on error or 0 if all pipes are created.
- */
-static int init_health_quit_pipe(void)
-{
- return fd_tracker_util_pipe_open_cloexec(the_fd_tracker,
- "Health quit pipe", health_quit_pipe);
-}
-
-/*
- * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
- */
-static int create_named_thread_poll_set(struct lttng_poll_event *events,
- int size, const char *name)
-{
- int ret;
-
- if (events == NULL || size == 0) {
- ret = -1;
- goto error;
- }
-
- ret = fd_tracker_util_poll_create(the_fd_tracker,
- name, events, 1, LTTNG_CLOEXEC);
- if (ret) {
- PERROR("Failed to create \"%s\" poll file descriptor", name);
- goto error;
- }
-
- /* Add quit pipe */
- ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
- if (ret < 0) {
- goto error;
- }
-
- return 0;
-
-error:
- return ret;
-}
-
-/*
- * Check if the thread quit pipe was triggered.
- *
- * Return 1 if it was triggered else 0;
- */
-static int check_thread_quit_pipe(int fd, uint32_t events)
-{
- if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
- return 1;
- }
-
- return 0;
-}
-
-static int create_sock(void *data, int *out_fd)
-{
- int ret;
- struct lttcomm_sock *sock = data;
-
- ret = lttcomm_create_sock(sock);
- if (ret < 0) {
- goto end;
- }
-
- *out_fd = sock->fd;
-end:
- return ret;
-}
-
-static int close_sock(void *data, int *in_fd)
-{
- struct lttcomm_sock *sock = data;
-
- return sock->ops->close(sock);
-}
-
-static int accept_sock(void *data, int *out_fd)
-{
- int ret = 0;
- /* Socks is an array of in_sock, out_sock. */
- struct lttcomm_sock **socks = data;
- struct lttcomm_sock *in_sock = socks[0];
-
- socks[1] = in_sock->ops->accept(in_sock);
- if (!socks[1]) {
- ret = -1;
- goto end;
- }
- *out_fd = socks[1]->fd;
-end:
- return ret;
-}
-
-/*
- * Create and init socket from uri.
- */
-static struct lttcomm_sock *relay_socket_create(struct lttng_uri *uri,
- const char *name)
-{
- int ret, sock_fd;
- struct lttcomm_sock *sock = NULL;
- char uri_str[PATH_MAX];
- char *formated_name = NULL;
-
- sock = lttcomm_alloc_sock_from_uri(uri);
- if (sock == NULL) {
- ERR("Allocating socket");
- goto error;
- }
-
- /*
- * Don't fail to create the socket if the name can't be built as it is
- * only used for debugging purposes.
- */
- ret = uri_to_str_url(uri, uri_str, sizeof(uri_str));
- uri_str[sizeof(uri_str) - 1] = '\0';
- if (ret >= 0) {
- ret = asprintf(&formated_name, "%s socket @ %s", name,
- uri_str);
- if (ret < 0) {
- formated_name = NULL;
- }
- }
-
- ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &sock_fd,
- (const char **) (formated_name ? &formated_name : NULL),
- 1, create_sock, sock);
- if (ret) {
- PERROR("Failed to open \"%s\" relay socket",
- formated_name ?: "Unknown");
- goto error;
- }
- DBG("Listening on %s socket %d", name, sock->fd);
-
- ret = sock->ops->bind(sock);
- if (ret < 0) {
- PERROR("Failed to bind socket");
- goto error;
- }
-
- ret = sock->ops->listen(sock, -1);
- if (ret < 0) {
- goto error;
-
- }
-
- free(formated_name);
- return sock;
-
-error:
- if (sock) {
- lttcomm_destroy_sock(sock);
- }
- free(formated_name);
- return NULL;
-}
-
-static
-struct lttcomm_sock *accept_relayd_sock(struct lttcomm_sock *listening_sock,
- const char *name)
-{
- int out_fd, ret;
- struct lttcomm_sock *socks[2] = { listening_sock, NULL };
- struct lttcomm_sock *new_sock = NULL;
-
- ret = fd_tracker_open_unsuspendable_fd(
- the_fd_tracker, &out_fd,
- (const char **) &name,
- 1, accept_sock, &socks);
- if (ret) {
- goto end;
- }
- new_sock = socks[1];
- DBG("%s accepted, socket %d", name, new_sock->fd);
-end:
- return new_sock;
-}
-
-/*
- * This thread manages the listening for new connections on the network
- */
-static void *relay_thread_listener(void *data)
-{
- int i, ret, pollfd, err = -1;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- struct lttcomm_sock *control_sock, *data_sock;
-
- DBG("[thread] Relay listener started");
-
- rcu_register_thread();
- health_register(health_relayd, HEALTH_RELAYD_TYPE_LISTENER);
-
- health_code_update();
-
- control_sock = relay_socket_create(control_uri, "Control listener");
- if (!control_sock) {
- goto error_sock_control;
- }
-
- data_sock = relay_socket_create(data_uri, "Data listener");
- if (!data_sock) {
- goto error_sock_relay;
- }
-
- /*
- * Pass 3 as size here for the thread quit pipe, control and
- * data socket.
- */
- ret = create_named_thread_poll_set(&events, 3, "Listener thread epoll");
- if (ret < 0) {
- goto error_create_poll;
- }
-
- /* Add the control socket */
- ret = lttng_poll_add(&events, control_sock->fd, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error_poll_add;
- }
-
- /* Add the data socket */
- ret = lttng_poll_add(&events, data_sock->fd, LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error_poll_add;
- }
-
- lttng_relay_notify_ready();
-
- if (testpoint(relayd_thread_listener)) {
- goto error_testpoint;
- }
-
- while (1) {
- health_code_update();
-
- DBG("Listener accepting connections");
-
-restart:
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- DBG("Relay new connection received");
- for (i = 0; i < nb_fd; i++) {
- health_code_update();
-
- /* Fetch once the poll data */
- revents = LTTNG_POLL_GETEV(&events, i);
- pollfd = LTTNG_POLL_GETFD(&events, i);
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- if (revents & LPOLLIN) {
- /*
- * A new connection is requested, therefore a
- * sessiond/consumerd connection is allocated in
- * this thread, enqueued to a global queue and
- * dequeued (and freed) in the worker thread.
- */
- int val = 1;
- struct relay_connection *new_conn;
- struct lttcomm_sock *newsock = NULL;
- enum connection_type type;
-
- if (pollfd == data_sock->fd) {
- type = RELAY_DATA;
- newsock = accept_relayd_sock(data_sock,
- "Data socket to relayd");
- } else {
- LTTNG_ASSERT(pollfd == control_sock->fd);
- type = RELAY_CONTROL;
- newsock = accept_relayd_sock(control_sock,
- "Control socket to relayd");
- }
- if (!newsock) {
- PERROR("accepting sock");
- goto error;
- }
-
- ret = setsockopt(newsock->fd, SOL_SOCKET, SO_REUSEADDR, &val,
- sizeof(val));
- if (ret < 0) {
- PERROR("setsockopt inet");
- lttcomm_destroy_sock(newsock);
- goto error;
- }
-
- ret = socket_apply_keep_alive_config(newsock->fd);
- if (ret < 0) {
- ERR("Failed to apply TCP keep-alive configuration on socket (%i)",
- newsock->fd);
- lttcomm_destroy_sock(newsock);
- goto error;
- }
-
- new_conn = connection_create(newsock, type);
- if (!new_conn) {
- lttcomm_destroy_sock(newsock);
- goto error;
- }
-
- /* Enqueue request for the dispatcher thread. */
- cds_wfcq_enqueue(&relay_conn_queue.head, &relay_conn_queue.tail,
- &new_conn->qnode);
-
- /*
- * Wake the dispatch queue futex.
- * Implicit memory barrier with the
- * exchange in cds_wfcq_enqueue.
- */
- futex_nto1_wake(&relay_conn_queue.futex);
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("socket poll error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
-exit:
-error:
-error_poll_add:
-error_testpoint:
- (void) fd_tracker_util_poll_clean(the_fd_tracker, &events);
-error_create_poll:
- if (data_sock->fd >= 0) {
- int data_sock_fd = data_sock->fd;
-
- ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker,
- &data_sock_fd, 1, close_sock,
- data_sock);
- if (ret) {
- PERROR("Failed to close the data listener socket file descriptor");
- }
- data_sock->fd = -1;
- }
- lttcomm_destroy_sock(data_sock);
-error_sock_relay:
- if (control_sock->fd >= 0) {
- int control_sock_fd = control_sock->fd;
-
- ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker,
- &control_sock_fd, 1, close_sock,
- control_sock);
- if (ret) {
- PERROR("Failed to close the control listener socket file descriptor");
- }
- control_sock->fd = -1;
- }
- lttcomm_destroy_sock(control_sock);
-error_sock_control:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- rcu_unregister_thread();
- DBG("Relay listener thread cleanup complete");
- lttng_relay_stop_threads();
- return NULL;
-}
-
-/*
- * This thread manages the dispatching of the requests to worker threads
- */
-static void *relay_thread_dispatcher(void *data)
-{
- int err = -1;
- ssize_t ret;
- struct cds_wfcq_node *node;
- struct relay_connection *new_conn = NULL;
-
- DBG("[thread] Relay dispatcher started");
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_DISPATCHER);
-
- if (testpoint(relayd_thread_dispatcher)) {
- goto error_testpoint;
- }
-
- health_code_update();
-
- for (;;) {
- health_code_update();
-
- /* Atomically prepare the queue futex */
- futex_nto1_prepare(&relay_conn_queue.futex);
-
- if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
- break;
- }
-
- do {
- health_code_update();
-
- /* Dequeue commands */
- node = cds_wfcq_dequeue_blocking(&relay_conn_queue.head,
- &relay_conn_queue.tail);
- if (node == NULL) {
- DBG("Woken up but nothing in the relay command queue");
- /* Continue thread execution */
- break;
- }
- new_conn = caa_container_of(node, struct relay_connection, qnode);
-
- DBG("Dispatching request waiting on sock %d", new_conn->sock->fd);
-
- /*
- * Inform worker thread of the new request. This
- * call is blocking so we can be assured that
- * the data will be read at some point in time
- * or wait to the end of the world :)
- */
- ret = lttng_write(relay_conn_pipe[1], &new_conn, sizeof(new_conn));
- if (ret < 0) {
- PERROR("write connection pipe");
- connection_put(new_conn);
- goto error;
- }
- } while (node != NULL);
-
- /* Futex wait on queue. Blocking call on futex() */
- health_poll_entry();
- futex_nto1_wait(&relay_conn_queue.futex);
- health_poll_exit();
- }
-
- /* Normal exit, no error */
- err = 0;
-
-error:
-error_testpoint:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- DBG("Dispatch thread dying");
- lttng_relay_stop_threads();
- return NULL;
-}
-
-static bool session_streams_have_index(const struct relay_session *session)
-{
- return session->minor >= 4 && !session->snapshot;
-}
-
-/*
- * Handle the RELAYD_CREATE_SESSION command.
- *
- * On success, send back the session id or else return a negative value.
- */
-static int relay_create_session(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- ssize_t send_ret;
- struct relay_session *session = NULL;
- struct lttcomm_relayd_create_session_reply_2_11 reply = {};
- char session_name[LTTNG_NAME_MAX] = {};
- char hostname[LTTNG_HOST_NAME_MAX] = {};
- uint32_t live_timer = 0;
- bool snapshot = false;
- bool session_name_contains_creation_timestamp = false;
- /* Left nil for peers < 2.11. */
- char base_path[LTTNG_PATH_MAX] = {};
- lttng_uuid sessiond_uuid = {};
- LTTNG_OPTIONAL(uint64_t) id_sessiond = {};
- LTTNG_OPTIONAL(uint64_t) current_chunk_id = {};
- LTTNG_OPTIONAL(time_t) creation_time = {};
- struct lttng_dynamic_buffer reply_payload;
-
- lttng_dynamic_buffer_init(&reply_payload);
-
- if (conn->minor < 4) {
- /* From 2.1 to 2.3 */
- ret = 0;
- } else if (conn->minor >= 4 && conn->minor < 11) {
- /* From 2.4 to 2.10 */
- ret = cmd_create_session_2_4(payload, session_name,
- hostname, &live_timer, &snapshot);
- } else {
- bool has_current_chunk;
- uint64_t current_chunk_id_value;
- time_t creation_time_value;
- uint64_t id_sessiond_value;
-
- /* From 2.11 to ... */
- ret = cmd_create_session_2_11(payload, session_name, hostname,
- base_path, &live_timer, &snapshot, &id_sessiond_value,
- sessiond_uuid, &has_current_chunk,
- ¤t_chunk_id_value, &creation_time_value,
- &session_name_contains_creation_timestamp);
- if (lttng_uuid_is_nil(sessiond_uuid)) {
- /* The nil UUID is reserved for pre-2.11 clients. */
- ERR("Illegal nil UUID announced by peer in create session command");
- ret = -1;
- goto send_reply;
- }
- LTTNG_OPTIONAL_SET(&id_sessiond, id_sessiond_value);
- LTTNG_OPTIONAL_SET(&creation_time, creation_time_value);
- if (has_current_chunk) {
- LTTNG_OPTIONAL_SET(¤t_chunk_id,
- current_chunk_id_value);
- }
- }
-
- if (ret < 0) {
- goto send_reply;
- }
-
- session = session_create(session_name, hostname, base_path, live_timer,
- snapshot, sessiond_uuid,
- id_sessiond.is_set ? &id_sessiond.value : NULL,
- current_chunk_id.is_set ? ¤t_chunk_id.value : NULL,
- creation_time.is_set ? &creation_time.value : NULL,
- conn->major, conn->minor,
- session_name_contains_creation_timestamp);
- if (!session) {
- ret = -1;
- goto send_reply;
- }
- LTTNG_ASSERT(!conn->session);
- conn->session = session;
- DBG("Created session %" PRIu64, session->id);
-
- reply.generic.session_id = htobe64(session->id);
-
-send_reply:
- if (ret < 0) {
- reply.generic.ret_code = htobe32(LTTNG_ERR_FATAL);
- } else {
- reply.generic.ret_code = htobe32(LTTNG_OK);
- }
-
- if (conn->minor < 11) {
- /* From 2.1 to 2.10 */
- ret = lttng_dynamic_buffer_append(&reply_payload,
- &reply.generic, sizeof(reply.generic));
- if (ret) {
- ERR("Failed to append \"create session\" command reply header to payload buffer");
- ret = -1;
- goto end;
- }
- } else {
- const uint32_t output_path_length =
- session ? strlen(session->output_path) + 1 : 0;
-
- reply.output_path_length = htobe32(output_path_length);
- ret = lttng_dynamic_buffer_append(
- &reply_payload, &reply, sizeof(reply));
- if (ret) {
- ERR("Failed to append \"create session\" command reply header to payload buffer");
- goto end;
- }
-
- if (output_path_length) {
- ret = lttng_dynamic_buffer_append(&reply_payload,
- session->output_path,
- output_path_length);
- if (ret) {
- ERR("Failed to append \"create session\" command reply path to payload buffer");
- goto end;
- }
- }
- }
-
- send_ret = conn->sock->ops->sendmsg(conn->sock, reply_payload.data,
- reply_payload.size, 0);
- if (send_ret < (ssize_t) reply_payload.size) {
- ERR("Failed to send \"create session\" command reply of %zu bytes (ret = %zd)",
- reply_payload.size, send_ret);
- ret = -1;
- }
-end:
- if (ret < 0 && session) {
- session_put(session);
- }
- lttng_dynamic_buffer_reset(&reply_payload);
- return ret;
-}
-
-/*
- * When we have received all the streams and the metadata for a channel,
- * we make them visible to the viewer threads.
- */
-static void publish_connection_local_streams(struct relay_connection *conn)
-{
- struct relay_stream *stream;
- struct relay_session *session = conn->session;
-
- /*
- * We publish all streams belonging to a session atomically wrt
- * session lock.
- */
- pthread_mutex_lock(&session->lock);
- rcu_read_lock();
- cds_list_for_each_entry_rcu(stream, &session->recv_list,
- recv_node) {
- stream_publish(stream);
- }
- rcu_read_unlock();
-
- /*
- * Inform the viewer that there are new streams in the session.
- */
- if (session->viewer_attached) {
- uatomic_set(&session->new_streams, 1);
- }
- pthread_mutex_unlock(&session->lock);
-}
-
-static int conform_channel_path(char *channel_path)
-{
- int ret = 0;
-
- if (strstr("../", channel_path)) {
- ERR("Refusing channel path as it walks up the path hierarchy: \"%s\"",
- channel_path);
- ret = -1;
- goto end;
- }
-
- if (*channel_path == '/') {
- const size_t len = strlen(channel_path);
-
- /*
- * Channel paths from peers prior to 2.11 are expressed as an
- * absolute path that is, in reality, relative to the relay
- * daemon's output directory. Remove the leading slash so it
- * is correctly interpreted as a relative path later on.
- *
- * len (and not len - 1) is used to copy the trailing NULL.
- */
- bcopy(channel_path + 1, channel_path, len);
- }
-end:
- return ret;
-}
-
-/*
- * relay_add_stream: allocate a new stream for a session
- */
-static int relay_add_stream(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct relay_stream *stream = NULL;
- struct lttcomm_relayd_status_stream reply;
- struct ctf_trace *trace = NULL;
- uint64_t stream_handle = -1ULL;
- char *path_name = NULL, *channel_name = NULL;
- uint64_t tracefile_size = 0, tracefile_count = 0;
- LTTNG_OPTIONAL(uint64_t) stream_chunk_id = {};
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to add a stream before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (session->minor == 1) {
- /* For 2.1 */
- ret = cmd_recv_stream_2_1(payload, &path_name,
- &channel_name);
- } else if (session->minor > 1 && session->minor < 11) {
- /* From 2.2 to 2.10 */
- ret = cmd_recv_stream_2_2(payload, &path_name,
- &channel_name, &tracefile_size, &tracefile_count);
- } else {
- /* From 2.11 to ... */
- ret = cmd_recv_stream_2_11(payload, &path_name,
- &channel_name, &tracefile_size, &tracefile_count,
- &stream_chunk_id.value);
- stream_chunk_id.is_set = true;
- }
-
- if (ret < 0) {
- goto send_reply;
- }
-
- if (conform_channel_path(path_name)) {
- goto send_reply;
- }
-
- /*
- * Backward compatibility for --group-output-by-session.
- * Prior to lttng 2.11, the complete path is passed by the stream.
- * Starting at 2.11, lttng-relayd uses chunk. When dealing with producer
- * >=2.11 the chunk is responsible for the output path. When dealing
- * with producer < 2.11 the chunk output_path is the root output path
- * and the stream carries the complete path (path_name).
- * To support --group-output-by-session with older producer (<2.11), we
- * need to craft the path based on the stream path.
- */
- if (opt_group_output_by == RELAYD_GROUP_OUTPUT_BY_SESSION) {
- if (conn->minor < 4) {
- /*
- * From 2.1 to 2.3, the session_name is not passed on
- * the RELAYD_CREATE_SESSION command. The session name
- * is necessary to detect the presence of a base_path
- * inside the stream path. Without it we cannot perform
- * a valid group-output-by-session transformation.
- */
- WARN("Unable to perform a --group-by-session transformation for session %" PRIu64
- " for stream with path \"%s\" as it is produced by a peer using a protocol older than v2.4",
- session->id, path_name);
- } else if (conn->minor >= 4 && conn->minor < 11) {
- char *group_by_session_path_name;
-
- LTTNG_ASSERT(session->session_name[0] != '\0');
-
- group_by_session_path_name =
- backward_compat_group_by_session(
- path_name,
- session->session_name,
- session->creation_time.value);
- if (!group_by_session_path_name) {
- ERR("Failed to apply group by session to stream of session %" PRIu64,
- session->id);
- goto send_reply;
- }
-
- DBG("Transformed session path from \"%s\" to \"%s\" to honor per-session name grouping",
- path_name, group_by_session_path_name);
-
- free(path_name);
- path_name = group_by_session_path_name;
- }
- }
-
- trace = ctf_trace_get_by_path_or_create(session, path_name);
- if (!trace) {
- goto send_reply;
- }
-
- /* This stream here has one reference on the trace. */
- pthread_mutex_lock(&last_relay_stream_id_lock);
- stream_handle = ++last_relay_stream_id;
- pthread_mutex_unlock(&last_relay_stream_id_lock);
-
- /* We pass ownership of path_name and channel_name. */
- stream = stream_create(trace, stream_handle, path_name,
- channel_name, tracefile_size, tracefile_count);
- path_name = NULL;
- channel_name = NULL;
-
- /*
- * Streams are the owners of their trace. Reference to trace is
- * kept within stream_create().
- */
- ctf_trace_put(trace);
-
-send_reply:
- memset(&reply, 0, sizeof(reply));
- reply.handle = htobe64(stream_handle);
- if (!stream) {
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- } else {
- reply.ret_code = htobe32(LTTNG_OK);
- }
-
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
- sizeof(struct lttcomm_relayd_status_stream), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"add stream\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-
-end_no_session:
- free(path_name);
- free(channel_name);
- return ret;
-}
-
-/*
- * relay_close_stream: close a specific stream
- */
-static int relay_close_stream(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_close_stream stream_info;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_stream *stream;
-
- DBG("Close stream received");
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to close a stream before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (payload->size < sizeof(stream_info)) {
- ERR("Unexpected payload size in \"relay_close_stream\": expected >= %zu bytes, got %zu bytes",
- sizeof(stream_info), payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&stream_info, payload->data, sizeof(stream_info));
- stream_info.stream_id = be64toh(stream_info.stream_id);
- stream_info.last_net_seq_num = be64toh(stream_info.last_net_seq_num);
-
- stream = stream_get_by_id(stream_info.stream_id);
- if (!stream) {
- ret = -1;
- goto end;
- }
-
- /*
- * Set last_net_seq_num before the close flag. Required by data
- * pending check.
- */
- pthread_mutex_lock(&stream->lock);
- stream->last_net_seq_num = stream_info.last_net_seq_num;
- pthread_mutex_unlock(&stream->lock);
-
- /*
- * This is one of the conditions which may trigger a stream close
- * with the others being:
- * 1) A close command is received for a stream
- * 2) The control connection owning the stream is closed
- * 3) We have received all of the stream's data _after_ a close
- * request.
- */
- try_stream_close(stream);
- if (stream->is_metadata) {
- struct relay_viewer_stream *vstream;
-
- vstream = viewer_stream_get_by_id(stream->stream_handle);
- if (vstream) {
- if (stream->no_new_metadata_notified) {
- /*
- * Since all the metadata has been sent to the
- * viewer and that we have a request to close
- * its stream, we can safely teardown the
- * corresponding metadata viewer stream.
- */
- viewer_stream_put(vstream);
- }
- /* Put local reference. */
- viewer_stream_put(vstream);
- }
- }
- stream_put(stream);
- ret = 0;
-
-end:
- memset(&reply, 0, sizeof(reply));
- if (ret < 0) {
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- } else {
- reply.ret_code = htobe32(LTTNG_OK);
- }
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
- sizeof(struct lttcomm_relayd_generic_reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"close stream\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * relay_reset_metadata: reset a metadata stream
- */
-static
-int relay_reset_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_reset_metadata stream_info;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_stream *stream;
-
- DBG("Reset metadata received");
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to reset a metadata stream before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (payload->size < sizeof(stream_info)) {
- ERR("Unexpected payload size in \"relay_reset_metadata\": expected >= %zu bytes, got %zu bytes",
- sizeof(stream_info), payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&stream_info, payload->data, sizeof(stream_info));
- stream_info.stream_id = be64toh(stream_info.stream_id);
- stream_info.version = be64toh(stream_info.version);
-
- DBG("Update metadata to version %" PRIu64, stream_info.version);
-
- /* Unsupported for live sessions for now. */
- if (session->live_timer != 0) {
- ret = -1;
- goto end;
- }
-
- stream = stream_get_by_id(stream_info.stream_id);
- if (!stream) {
- ret = -1;
- goto end;
- }
- pthread_mutex_lock(&stream->lock);
- if (!stream->is_metadata) {
- ret = -1;
- goto end_unlock;
- }
-
- ret = stream_reset_file(stream);
- if (ret < 0) {
- ERR("Failed to reset metadata stream %" PRIu64
- ": stream_path = %s, channel = %s",
- stream->stream_handle, stream->path_name,
- stream->channel_name);
- goto end_unlock;
- }
-end_unlock:
- pthread_mutex_unlock(&stream->lock);
- stream_put(stream);
-
-end:
- memset(&reply, 0, sizeof(reply));
- if (ret < 0) {
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- } else {
- reply.ret_code = htobe32(LTTNG_OK);
- }
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
- sizeof(struct lttcomm_relayd_generic_reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"reset metadata\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * relay_unknown_command: send -1 if received unknown command
- */
-static void relay_unknown_command(struct relay_connection *conn)
-{
- struct lttcomm_relayd_generic_reply reply;
- ssize_t send_ret;
-
- memset(&reply, 0, sizeof(reply));
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < sizeof(reply)) {
- ERR("Failed to send \"unknown command\" command reply (ret = %zd)", send_ret);
- }
-}
-
-/*
- * relay_start: send an acknowledgment to the client to tell if we are
- * ready to receive data. We are ready if a session is established.
- */
-static int relay_start(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- ssize_t send_ret;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_session *session = conn->session;
-
- if (!session) {
- DBG("Trying to start the streaming without a session established");
- ret = htobe32(LTTNG_ERR_UNK);
- }
-
- memset(&reply, 0, sizeof(reply));
- reply.ret_code = htobe32(LTTNG_OK);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
- sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"relay_start\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-
- return ret;
-}
-
-/*
- * relay_recv_metadata: receive the metadata for the session.
- */
-static int relay_recv_metadata(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_metadata_payload metadata_payload_header;
- struct relay_stream *metadata_stream;
- uint64_t metadata_payload_size;
- struct lttng_buffer_view packet_view;
-
- if (!session) {
- ERR("Metadata sent before version check");
- ret = -1;
- goto end;
- }
-
- if (recv_hdr->data_size < sizeof(struct lttcomm_relayd_metadata_payload)) {
- ERR("Incorrect data size");
- ret = -1;
- goto end;
- }
- metadata_payload_size = recv_hdr->data_size -
- sizeof(struct lttcomm_relayd_metadata_payload);
-
- memcpy(&metadata_payload_header, payload->data,
- sizeof(metadata_payload_header));
- metadata_payload_header.stream_id = be64toh(
- metadata_payload_header.stream_id);
- metadata_payload_header.padding_size = be32toh(
- metadata_payload_header.padding_size);
-
- metadata_stream = stream_get_by_id(metadata_payload_header.stream_id);
- if (!metadata_stream) {
- ret = -1;
- goto end;
- }
-
- packet_view = lttng_buffer_view_from_view(payload,
- sizeof(metadata_payload_header), metadata_payload_size);
- if (!lttng_buffer_view_is_valid(&packet_view)) {
- ERR("Invalid metadata packet length announced by header");
- ret = -1;
- goto end_put;
- }
-
- pthread_mutex_lock(&metadata_stream->lock);
- ret = stream_write(metadata_stream, &packet_view,
- metadata_payload_header.padding_size);
- pthread_mutex_unlock(&metadata_stream->lock);
- if (ret){
- ret = -1;
- goto end_put;
- }
-end_put:
- stream_put(metadata_stream);
-end:
- return ret;
-}
-
-/*
- * relay_send_version: send relayd version number
- */
-static int relay_send_version(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct lttcomm_relayd_version reply, msg;
- bool compatible = true;
-
- conn->version_check_done = true;
-
- /* Get version from the other side. */
- if (payload->size < sizeof(msg)) {
- ERR("Unexpected payload size in \"relay_send_version\": expected >= %zu bytes, got %zu bytes",
- sizeof(msg), payload->size);
- ret = -1;
- goto end;
- }
-
- memcpy(&msg, payload->data, sizeof(msg));
- msg.major = be32toh(msg.major);
- msg.minor = be32toh(msg.minor);
-
- memset(&reply, 0, sizeof(reply));
- reply.major = RELAYD_VERSION_COMM_MAJOR;
- reply.minor = RELAYD_VERSION_COMM_MINOR;
-
- /* Major versions must be the same */
- if (reply.major != msg.major) {
- DBG("Incompatible major versions (%u vs %u), deleting session",
- reply.major, msg.major);
- compatible = false;
- }
-
- conn->major = reply.major;
- /* We adapt to the lowest compatible version */
- if (reply.minor <= msg.minor) {
- conn->minor = reply.minor;
- } else {
- conn->minor = msg.minor;
- }
-
- reply.major = htobe32(reply.major);
- reply.minor = htobe32(reply.minor);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
- sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"send version\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- goto end;
- } else {
- ret = 0;
- }
-
- if (!compatible) {
- ret = -1;
- goto end;
- }
-
- DBG("Version check done using protocol %u.%u", conn->major,
- conn->minor);
-
-end:
- return ret;
-}
-
-/*
- * Check for data pending for a given stream id from the session daemon.
- */
-static int relay_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_data_pending msg;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_stream *stream;
- ssize_t send_ret;
- int ret;
- uint64_t stream_seq;
-
- DBG("Data pending command received");
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to check for data before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (payload->size < sizeof(msg)) {
- ERR("Unexpected payload size in \"relay_data_pending\": expected >= %zu bytes, got %zu bytes",
- sizeof(msg), payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&msg, payload->data, sizeof(msg));
- msg.stream_id = be64toh(msg.stream_id);
- msg.last_net_seq_num = be64toh(msg.last_net_seq_num);
-
- stream = stream_get_by_id(msg.stream_id);
- if (stream == NULL) {
- ret = -1;
- goto end;
- }
-
- pthread_mutex_lock(&stream->lock);
-
- if (session_streams_have_index(session)) {
- /*
- * Ensure that both the index and stream data have been
- * flushed up to the requested point.
- */
- stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
- } else {
- stream_seq = stream->prev_data_seq;
- }
- DBG("Data pending for stream id %" PRIu64 ": prev_data_seq %" PRIu64
- ", prev_index_seq %" PRIu64
- ", and last_seq %" PRIu64, msg.stream_id,
- stream->prev_data_seq, stream->prev_index_seq,
- msg.last_net_seq_num);
-
- /* Avoid wrapping issue */
- if (((int64_t) (stream_seq - msg.last_net_seq_num)) >= 0) {
- /* Data has in fact been written and is NOT pending */
- ret = 0;
- } else {
- /* Data still being streamed thus pending */
- ret = 1;
- }
-
- stream->data_pending_check_done = true;
- pthread_mutex_unlock(&stream->lock);
-
- stream_put(stream);
-end:
-
- memset(&reply, 0, sizeof(reply));
- reply.ret_code = htobe32(ret);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"data pending\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * Wait for the control socket to reach a quiescent state.
- *
- * Note that for now, when receiving this command from the session
- * daemon, this means that every subsequent commands or data received on
- * the control socket has been handled. So, this is why we simply return
- * OK here.
- */
-static int relay_quiescent_control(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct relay_stream *stream;
- struct lttcomm_relayd_quiescent_control msg;
- struct lttcomm_relayd_generic_reply reply;
-
- DBG("Checking quiescent state on control socket");
-
- if (!conn->session || !conn->version_check_done) {
- ERR("Trying to check for data before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (payload->size < sizeof(msg)) {
- ERR("Unexpected payload size in \"relay_quiescent_control\": expected >= %zu bytes, got %zu bytes",
- sizeof(msg), payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&msg, payload->data, sizeof(msg));
- msg.stream_id = be64toh(msg.stream_id);
-
- stream = stream_get_by_id(msg.stream_id);
- if (!stream) {
- goto reply;
- }
- pthread_mutex_lock(&stream->lock);
- stream->data_pending_check_done = true;
- pthread_mutex_unlock(&stream->lock);
-
- DBG("Relay quiescent control pending flag set to %" PRIu64, msg.stream_id);
- stream_put(stream);
-reply:
- memset(&reply, 0, sizeof(reply));
- reply.ret_code = htobe32(LTTNG_OK);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"quiescent control\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- } else {
- ret = 0;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * Initialize a data pending command. This means that a consumer is about
- * to ask for data pending for each stream it holds. Simply iterate over
- * all streams of a session and set the data_pending_check_done flag.
- *
- * This command returns to the client a LTTNG_OK code.
- */
-static int relay_begin_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct lttng_ht_iter iter;
- struct lttcomm_relayd_begin_data_pending msg;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_stream *stream;
-
- LTTNG_ASSERT(recv_hdr);
- LTTNG_ASSERT(conn);
-
- DBG("Init streams for data pending");
-
- if (!conn->session || !conn->version_check_done) {
- ERR("Trying to check for data before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (payload->size < sizeof(msg)) {
- ERR("Unexpected payload size in \"relay_begin_data_pending\": expected >= %zu bytes, got %zu bytes",
- sizeof(msg), payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&msg, payload->data, sizeof(msg));
- msg.session_id = be64toh(msg.session_id);
-
- /*
- * Iterate over all streams to set the begin data pending flag.
- * For now, the streams are indexed by stream handle so we have
- * to iterate over all streams to find the one associated with
- * the right session_id.
- */
- rcu_read_lock();
- cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
- node.node) {
- if (!stream_get(stream)) {
- continue;
- }
- if (stream->trace->session->id == msg.session_id) {
- pthread_mutex_lock(&stream->lock);
- stream->data_pending_check_done = false;
- pthread_mutex_unlock(&stream->lock);
- DBG("Set begin data pending flag to stream %" PRIu64,
- stream->stream_handle);
- }
- stream_put(stream);
- }
- rcu_read_unlock();
-
- memset(&reply, 0, sizeof(reply));
- /* All good, send back reply. */
- reply.ret_code = htobe32(LTTNG_OK);
-
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"begin data pending\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- } else {
- ret = 0;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * End data pending command. This will check, for a given session id, if
- * each stream associated with it has its data_pending_check_done flag
- * set. If not, this means that the client lost track of the stream but
- * the data is still being streamed on our side. In this case, we inform
- * the client that data is in flight.
- *
- * Return to the client if there is data in flight or not with a ret_code.
- */
-static int relay_end_data_pending(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct lttng_ht_iter iter;
- struct lttcomm_relayd_end_data_pending msg;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_stream *stream;
- uint32_t is_data_inflight = 0;
-
- DBG("End data pending command");
-
- if (!conn->session || !conn->version_check_done) {
- ERR("Trying to check for data before version check");
- ret = -1;
- goto end_no_session;
- }
-
- if (payload->size < sizeof(msg)) {
- ERR("Unexpected payload size in \"relay_end_data_pending\": expected >= %zu bytes, got %zu bytes",
- sizeof(msg), payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&msg, payload->data, sizeof(msg));
- msg.session_id = be64toh(msg.session_id);
-
- /*
- * Iterate over all streams to see if the begin data pending
- * flag is set.
- */
- rcu_read_lock();
- cds_lfht_for_each_entry(relay_streams_ht->ht, &iter.iter, stream,
- node.node) {
- if (!stream_get(stream)) {
- continue;
- }
- if (stream->trace->session->id != msg.session_id) {
- stream_put(stream);
- continue;
- }
- pthread_mutex_lock(&stream->lock);
- if (!stream->data_pending_check_done) {
- uint64_t stream_seq;
-
- if (session_streams_have_index(conn->session)) {
- /*
- * Ensure that both the index and stream data have been
- * flushed up to the requested point.
- */
- stream_seq = min(stream->prev_data_seq, stream->prev_index_seq);
- } else {
- stream_seq = stream->prev_data_seq;
- }
- if (!stream->closed || !(((int64_t) (stream_seq - stream->last_net_seq_num)) >= 0)) {
- is_data_inflight = 1;
- DBG("Data is still in flight for stream %" PRIu64,
- stream->stream_handle);
- pthread_mutex_unlock(&stream->lock);
- stream_put(stream);
- break;
- }
- }
- pthread_mutex_unlock(&stream->lock);
- stream_put(stream);
- }
- rcu_read_unlock();
-
- memset(&reply, 0, sizeof(reply));
- /* All good, send back reply. */
- reply.ret_code = htobe32(is_data_inflight);
-
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"end data pending\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- } else {
- ret = 0;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * Receive an index for a specific stream.
- *
- * Return 0 on success else a negative value.
- */
-static int relay_recv_index(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_index index_info;
- struct lttcomm_relayd_generic_reply reply;
- struct relay_stream *stream;
- size_t msg_len;
-
- LTTNG_ASSERT(conn);
-
- DBG("Relay receiving index");
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to close a stream before version check");
- ret = -1;
- goto end_no_session;
- }
-
- msg_len = lttcomm_relayd_index_len(
- lttng_to_index_major(conn->major, conn->minor),
- lttng_to_index_minor(conn->major, conn->minor));
- if (payload->size < msg_len) {
- ERR("Unexpected payload size in \"relay_recv_index\": expected >= %zu bytes, got %zu bytes",
- msg_len, payload->size);
- ret = -1;
- goto end_no_session;
- }
- memcpy(&index_info, payload->data, msg_len);
- index_info.relay_stream_id = be64toh(index_info.relay_stream_id);
- index_info.net_seq_num = be64toh(index_info.net_seq_num);
- index_info.packet_size = be64toh(index_info.packet_size);
- index_info.content_size = be64toh(index_info.content_size);
- index_info.timestamp_begin = be64toh(index_info.timestamp_begin);
- index_info.timestamp_end = be64toh(index_info.timestamp_end);
- index_info.events_discarded = be64toh(index_info.events_discarded);
- index_info.stream_id = be64toh(index_info.stream_id);
-
- if (conn->minor >= 8) {
- index_info.stream_instance_id =
- be64toh(index_info.stream_instance_id);
- index_info.packet_seq_num = be64toh(index_info.packet_seq_num);
- } else {
- index_info.stream_instance_id = -1ULL;
- index_info.packet_seq_num = -1ULL;
- }
-
- stream = stream_get_by_id(index_info.relay_stream_id);
- if (!stream) {
- ERR("stream_get_by_id not found");
- ret = -1;
- goto end;
- }
-
- pthread_mutex_lock(&stream->lock);
- ret = stream_add_index(stream, &index_info);
- pthread_mutex_unlock(&stream->lock);
- if (ret) {
- goto end_stream_put;
- }
-
-end_stream_put:
- stream_put(stream);
-end:
- memset(&reply, 0, sizeof(reply));
- if (ret < 0) {
- reply.ret_code = htobe32(LTTNG_ERR_UNK);
- } else {
- reply.ret_code = htobe32(LTTNG_OK);
- }
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"recv index\" command reply (ret = %zd)", send_ret);
- ret = -1;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * Receive the streams_sent message.
- *
- * Return 0 on success else a negative value.
- */
-static int relay_streams_sent(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret;
- ssize_t send_ret;
- struct lttcomm_relayd_generic_reply reply;
-
- LTTNG_ASSERT(conn);
-
- DBG("Relay receiving streams_sent");
-
- if (!conn->session || !conn->version_check_done) {
- ERR("Trying to close a stream before version check");
- ret = -1;
- goto end_no_session;
- }
-
- /*
- * Publish every pending stream in the connection recv list which are
- * now ready to be used by the viewer.
- */
- publish_connection_local_streams(conn);
-
- memset(&reply, 0, sizeof(reply));
- reply.ret_code = htobe32(LTTNG_OK);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"streams sent\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- } else {
- /* Success. */
- ret = 0;
- }
-
-end_no_session:
- return ret;
-}
-
-/*
- * relay_rotate_session_stream: rotate a stream to a new tracefile for the
- * session rotation feature (not the tracefile rotation feature).
- */
-static int relay_rotate_session_streams(
- const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- uint32_t i;
- ssize_t send_ret;
- enum lttng_error_code reply_code = LTTNG_ERR_UNK;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_rotate_streams rotate_streams;
- struct lttcomm_relayd_generic_reply reply = {};
- struct relay_stream *stream = NULL;
- const size_t header_len = sizeof(struct lttcomm_relayd_rotate_streams);
- struct lttng_trace_chunk *next_trace_chunk = NULL;
- struct lttng_buffer_view stream_positions;
- char chunk_id_buf[MAX_INT_DEC_LEN(uint64_t)];
- const char *chunk_id_str = "none";
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to rotate a stream before version check");
- ret = -1;
- goto end_no_reply;
- }
-
- if (session->major == 2 && session->minor < 11) {
- ERR("Unsupported feature before 2.11");
- ret = -1;
- goto end_no_reply;
- }
-
- if (payload->size < header_len) {
- ERR("Unexpected payload size in \"relay_rotate_session_stream\": expected >= %zu bytes, got %zu bytes",
- header_len, payload->size);
- ret = -1;
- goto end_no_reply;
- }
-
- memcpy(&rotate_streams, payload->data, header_len);
-
- /* Convert header to host endianness. */
- rotate_streams = (typeof(rotate_streams)) {
- .stream_count = be32toh(rotate_streams.stream_count),
- .new_chunk_id = (typeof(rotate_streams.new_chunk_id)) {
- .is_set = !!rotate_streams.new_chunk_id.is_set,
- .value = be64toh(rotate_streams.new_chunk_id.value),
- }
- };
-
- if (rotate_streams.new_chunk_id.is_set) {
- /*
- * Retrieve the trace chunk the stream must transition to. As
- * per the protocol, this chunk should have been created
- * before this command is received.
- */
- next_trace_chunk = sessiond_trace_chunk_registry_get_chunk(
- sessiond_trace_chunk_registry,
- session->sessiond_uuid, session->id,
- rotate_streams.new_chunk_id.value);
- if (!next_trace_chunk) {
- char uuid_str[LTTNG_UUID_STR_LEN];
-
- lttng_uuid_to_str(session->sessiond_uuid, uuid_str);
- ERR("Unknown next trace chunk in ROTATE_STREAMS command: sessiond_uuid = {%s}, session_id = %" PRIu64
- ", trace_chunk_id = %" PRIu64,
- uuid_str, session->id,
- rotate_streams.new_chunk_id.value);
- reply_code = LTTNG_ERR_INVALID_PROTOCOL;
- ret = -1;
- goto end;
- }
-
- ret = snprintf(chunk_id_buf, sizeof(chunk_id_buf), "%" PRIu64,
- rotate_streams.new_chunk_id.value);
- if (ret < 0 || ret >= sizeof(chunk_id_buf)) {
- chunk_id_str = "formatting error";
- } else {
- chunk_id_str = chunk_id_buf;
- }
- }
-
- DBG("Rotate %" PRIu32 " streams of session \"%s\" to chunk \"%s\"",
- rotate_streams.stream_count, session->session_name,
- chunk_id_str);
-
- stream_positions = lttng_buffer_view_from_view(payload,
- sizeof(rotate_streams), -1);
- if (!stream_positions.data ||
- stream_positions.size <
- (rotate_streams.stream_count *
- sizeof(struct lttcomm_relayd_stream_rotation_position))) {
- reply_code = LTTNG_ERR_INVALID_PROTOCOL;
- ret = -1;
- goto end;
- }
-
- for (i = 0; i < rotate_streams.stream_count; i++) {
- struct lttcomm_relayd_stream_rotation_position *position_comm =
- &((typeof(position_comm)) stream_positions.data)[i];
- const struct lttcomm_relayd_stream_rotation_position pos = {
- .stream_id = be64toh(position_comm->stream_id),
- .rotate_at_seq_num = be64toh(
- position_comm->rotate_at_seq_num),
- };
-
- stream = stream_get_by_id(pos.stream_id);
- if (!stream) {
- reply_code = LTTNG_ERR_INVALID;
- ret = -1;
- goto end;
- }
-
- pthread_mutex_lock(&stream->lock);
- ret = stream_set_pending_rotation(stream, next_trace_chunk,
- pos.rotate_at_seq_num);
- pthread_mutex_unlock(&stream->lock);
- if (ret) {
- reply_code = LTTNG_ERR_FILE_CREATION_ERROR;
- goto end;
- }
-
- stream_put(stream);
- stream = NULL;
- }
-
- reply_code = LTTNG_OK;
- ret = 0;
-end:
- if (stream) {
- stream_put(stream);
- }
-
- reply.ret_code = htobe32((uint32_t) reply_code);
- send_ret = conn->sock->ops->sendmsg(conn->sock, &reply,
- sizeof(struct lttcomm_relayd_generic_reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"rotate session stream\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-end_no_reply:
- lttng_trace_chunk_put(next_trace_chunk);
- return ret;
-}
-
-
-
-/*
- * relay_create_trace_chunk: create a new trace chunk
- */
-static int relay_create_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_create_trace_chunk *msg;
- struct lttcomm_relayd_generic_reply reply = {};
- struct lttng_buffer_view header_view;
- struct lttng_trace_chunk *chunk = NULL, *published_chunk = NULL;
- enum lttng_error_code reply_code = LTTNG_OK;
- enum lttng_trace_chunk_status chunk_status;
- const char *new_path;
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to create a trace chunk before version check");
- ret = -1;
- goto end_no_reply;
- }
-
- if (session->major == 2 && session->minor < 11) {
- ERR("Chunk creation command is unsupported before 2.11");
- ret = -1;
- goto end_no_reply;
- }
-
- header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
- if (!lttng_buffer_view_is_valid(&header_view)) {
- ERR("Failed to receive payload of chunk creation command");
- ret = -1;
- goto end_no_reply;
- }
-
- /* Convert to host endianness. */
- msg = (typeof(msg)) header_view.data;
- msg->chunk_id = be64toh(msg->chunk_id);
- msg->creation_timestamp = be64toh(msg->creation_timestamp);
- msg->override_name_length = be32toh(msg->override_name_length);
-
- if (session->current_trace_chunk &&
- !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
- chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
- DEFAULT_CHUNK_TMP_OLD_DIRECTORY);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ERR("Failed to rename old chunk");
- ret = -1;
- reply_code = LTTNG_ERR_UNK;
- goto end;
- }
- }
- session->ongoing_rotation = true;
- if (!session->current_trace_chunk) {
- if (!session->has_rotated) {
- new_path = "";
- } else {
- new_path = NULL;
- }
- } else {
- new_path = DEFAULT_CHUNK_TMP_NEW_DIRECTORY;
- }
- chunk = lttng_trace_chunk_create(
- msg->chunk_id, msg->creation_timestamp, new_path);
- if (!chunk) {
- ERR("Failed to create trace chunk in trace chunk creation command");
- ret = -1;
- reply_code = LTTNG_ERR_NOMEM;
- goto end;
- }
- lttng_trace_chunk_set_fd_tracker(chunk, the_fd_tracker);
-
- if (msg->override_name_length) {
- const char *name;
- const struct lttng_buffer_view chunk_name_view =
- lttng_buffer_view_from_view(payload,
- sizeof(*msg),
- msg->override_name_length);
-
- if (!lttng_buffer_view_is_valid(&chunk_name_view)) {
- ERR("Invalid payload of chunk creation command (protocol error): buffer too short for expected name length");
- ret = -1;
- reply_code = LTTNG_ERR_INVALID;
- goto end;
- }
-
- name = chunk_name_view.data;
- if (name[msg->override_name_length - 1]) {
- ERR("Invalid payload of chunk creation command (protocol error): name is not null-terminated");
- ret = -1;
- reply_code = LTTNG_ERR_INVALID;
- goto end;
- }
-
- chunk_status = lttng_trace_chunk_override_name(
- chunk, chunk_name_view.data);
- switch (chunk_status) {
- case LTTNG_TRACE_CHUNK_STATUS_OK:
- break;
- case LTTNG_TRACE_CHUNK_STATUS_INVALID_ARGUMENT:
- ERR("Failed to set the name of new trace chunk in trace chunk creation command (invalid name)");
- reply_code = LTTNG_ERR_INVALID;
- ret = -1;
- goto end;
- default:
- ERR("Failed to set the name of new trace chunk in trace chunk creation command (unknown error)");
- reply_code = LTTNG_ERR_UNK;
- ret = -1;
- goto end;
- }
- }
-
- chunk_status = lttng_trace_chunk_set_credentials_current_user(chunk);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- reply_code = LTTNG_ERR_UNK;
- ret = -1;
- goto end;
- }
-
- LTTNG_ASSERT(conn->session->output_directory);
- chunk_status = lttng_trace_chunk_set_as_owner(chunk,
- conn->session->output_directory);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- reply_code = LTTNG_ERR_UNK;
- ret = -1;
- goto end;
- }
-
- published_chunk = sessiond_trace_chunk_registry_publish_chunk(
- sessiond_trace_chunk_registry,
- conn->session->sessiond_uuid,
- conn->session->id,
- chunk);
- if (!published_chunk) {
- char uuid_str[LTTNG_UUID_STR_LEN];
-
- lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
- ERR("Failed to publish chunk: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
- uuid_str,
- conn->session->id,
- msg->chunk_id);
- ret = -1;
- reply_code = LTTNG_ERR_NOMEM;
- goto end;
- }
-
- pthread_mutex_lock(&conn->session->lock);
- if (conn->session->pending_closure_trace_chunk) {
- /*
- * Invalid; this means a second create_trace_chunk command was
- * received before a close_trace_chunk.
- */
- ERR("Invalid trace chunk close command received; a trace chunk is already waiting for a trace chunk close command");
- reply_code = LTTNG_ERR_INVALID_PROTOCOL;
- ret = -1;
- goto end_unlock_session;
- }
- conn->session->pending_closure_trace_chunk =
- conn->session->current_trace_chunk;
- conn->session->current_trace_chunk = published_chunk;
- published_chunk = NULL;
- if (!conn->session->pending_closure_trace_chunk) {
- session->ongoing_rotation = false;
- }
-end_unlock_session:
- pthread_mutex_unlock(&conn->session->lock);
-end:
- reply.ret_code = htobe32((uint32_t) reply_code);
- send_ret = conn->sock->ops->sendmsg(conn->sock,
- &reply,
- sizeof(struct lttcomm_relayd_generic_reply),
- 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-end_no_reply:
- lttng_trace_chunk_put(chunk);
- lttng_trace_chunk_put(published_chunk);
- return ret;
-}
-
-/*
- * relay_close_trace_chunk: close a trace chunk
- */
-static int relay_close_trace_chunk(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0, buf_ret;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_close_trace_chunk *msg;
- struct lttcomm_relayd_close_trace_chunk_reply reply = {};
- struct lttng_buffer_view header_view;
- struct lttng_trace_chunk *chunk = NULL;
- enum lttng_error_code reply_code = LTTNG_OK;
- enum lttng_trace_chunk_status chunk_status;
- uint64_t chunk_id;
- LTTNG_OPTIONAL(enum lttng_trace_chunk_command_type) close_command = {};
- time_t close_timestamp;
- char closed_trace_chunk_path[LTTNG_PATH_MAX];
- size_t path_length = 0;
- const char *chunk_name = NULL;
- struct lttng_dynamic_buffer reply_payload;
- const char *new_path;
-
- lttng_dynamic_buffer_init(&reply_payload);
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to close a trace chunk before version check");
- ret = -1;
- goto end_no_reply;
- }
-
- if (session->major == 2 && session->minor < 11) {
- ERR("Chunk close command is unsupported before 2.11");
- ret = -1;
- goto end_no_reply;
- }
-
- header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
- if (!lttng_buffer_view_is_valid(&header_view)) {
- ERR("Failed to receive payload of chunk close command");
- ret = -1;
- goto end_no_reply;
- }
-
- /* Convert to host endianness. */
- msg = (typeof(msg)) header_view.data;
- chunk_id = be64toh(msg->chunk_id);
- close_timestamp = (time_t) be64toh(msg->close_timestamp);
- close_command = (typeof(close_command)){
- .value = be32toh(msg->close_command.value),
- .is_set = msg->close_command.is_set,
- };
-
- chunk = sessiond_trace_chunk_registry_get_chunk(
- sessiond_trace_chunk_registry,
- conn->session->sessiond_uuid,
- conn->session->id,
- chunk_id);
- if (!chunk) {
- char uuid_str[LTTNG_UUID_STR_LEN];
-
- lttng_uuid_to_str(conn->session->sessiond_uuid, uuid_str);
- ERR("Failed to find chunk to close: sessiond_uuid = %s, session_id = %" PRIu64 ", chunk_id = %" PRIu64,
- uuid_str,
- conn->session->id,
- msg->chunk_id);
- ret = -1;
- reply_code = LTTNG_ERR_NOMEM;
- goto end;
- }
-
- pthread_mutex_lock(&session->lock);
- if (close_command.is_set &&
- close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE) {
- /*
- * Clear command. It is a protocol error to ask for a
- * clear on a relay which does not allow it. Querying
- * the configuration allows figuring out whether
- * clearing is allowed before doing the clear.
- */
- if (!opt_allow_clear) {
- ret = -1;
- reply_code = LTTNG_ERR_INVALID_PROTOCOL;
- goto end_unlock_session;
- }
- }
- if (session->pending_closure_trace_chunk &&
- session->pending_closure_trace_chunk != chunk) {
- ERR("Trace chunk close command for session \"%s\" does not target the trace chunk pending closure",
- session->session_name);
- reply_code = LTTNG_ERR_INVALID_PROTOCOL;
- ret = -1;
- goto end_unlock_session;
- }
-
- if (session->current_trace_chunk && session->current_trace_chunk != chunk &&
- !lttng_trace_chunk_get_name_overridden(session->current_trace_chunk)) {
- if (close_command.is_set &&
- close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_DELETE &&
- !session->has_rotated) {
- /* New chunk stays in session output directory. */
- new_path = "";
- } else {
- /* Use chunk name for new chunk. */
- new_path = NULL;
- }
- /* Rename new chunk path. */
- chunk_status = lttng_trace_chunk_rename_path(session->current_trace_chunk,
- new_path);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret = -1;
- goto end_unlock_session;
- }
- session->ongoing_rotation = false;
- }
- if ((!close_command.is_set ||
- close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION) &&
- !lttng_trace_chunk_get_name_overridden(chunk)) {
- const char *old_path;
-
- if (!session->has_rotated) {
- old_path = "";
- } else {
- old_path = NULL;
- }
- /* We need to move back the .tmp_old_chunk to its rightful place. */
- chunk_status = lttng_trace_chunk_rename_path(chunk, old_path);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret = -1;
- goto end_unlock_session;
- }
- }
- chunk_status = lttng_trace_chunk_set_close_timestamp(
- chunk, close_timestamp);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ERR("Failed to set trace chunk close timestamp");
- ret = -1;
- reply_code = LTTNG_ERR_UNK;
- goto end_unlock_session;
- }
-
- if (close_command.is_set) {
- chunk_status = lttng_trace_chunk_set_close_command(
- chunk, close_command.value);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ret = -1;
- reply_code = LTTNG_ERR_INVALID;
- goto end_unlock_session;
- }
- }
- chunk_status = lttng_trace_chunk_get_name(chunk, &chunk_name, NULL);
- if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) {
- ERR("Failed to get chunk name");
- ret = -1;
- reply_code = LTTNG_ERR_UNK;
- goto end_unlock_session;
- }
- if (!session->has_rotated && !session->snapshot) {
- ret = lttng_strncpy(closed_trace_chunk_path,
- session->output_path,
- sizeof(closed_trace_chunk_path));
- if (ret) {
- ERR("Failed to send trace chunk path: path length of %zu bytes exceeds the maximal allowed length of %zu bytes",
- strlen(session->output_path),
- sizeof(closed_trace_chunk_path));
- reply_code = LTTNG_ERR_NOMEM;
- ret = -1;
- goto end_unlock_session;
- }
- } else {
- if (session->snapshot) {
- ret = snprintf(closed_trace_chunk_path,
- sizeof(closed_trace_chunk_path),
- "%s/%s", session->output_path,
- chunk_name);
- } else {
- ret = snprintf(closed_trace_chunk_path,
- sizeof(closed_trace_chunk_path),
- "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
- "/%s",
- session->output_path, chunk_name);
- }
- if (ret < 0 || ret == sizeof(closed_trace_chunk_path)) {
- ERR("Failed to format closed trace chunk resulting path");
- reply_code = ret < 0 ? LTTNG_ERR_UNK : LTTNG_ERR_NOMEM;
- ret = -1;
- goto end_unlock_session;
- }
- }
- if (close_command.is_set &&
- close_command.value == LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED) {
- session->has_rotated = true;
- }
- DBG("Reply chunk path on close: %s", closed_trace_chunk_path);
- path_length = strlen(closed_trace_chunk_path) + 1;
- if (path_length > UINT32_MAX) {
- ERR("Closed trace chunk path exceeds the maximal length allowed by the protocol");
- ret = -1;
- reply_code = LTTNG_ERR_INVALID_PROTOCOL;
- goto end_unlock_session;
- }
-
- if (session->current_trace_chunk == chunk) {
- /*
- * After a trace chunk close command, no new streams
- * referencing the chunk may be created. Hence, on the
- * event that no new trace chunk have been created for
- * the session, the reference to the current trace chunk
- * is released in order to allow it to be reclaimed when
- * the last stream releases its reference to it.
- */
- lttng_trace_chunk_put(session->current_trace_chunk);
- session->current_trace_chunk = NULL;
- }
- lttng_trace_chunk_put(session->pending_closure_trace_chunk);
- session->pending_closure_trace_chunk = NULL;
-end_unlock_session:
- pthread_mutex_unlock(&session->lock);
-
-end:
- reply.generic.ret_code = htobe32((uint32_t) reply_code);
- reply.path_length = htobe32((uint32_t) path_length);
- buf_ret = lttng_dynamic_buffer_append(
- &reply_payload, &reply, sizeof(reply));
- if (buf_ret) {
- ERR("Failed to append \"close trace chunk\" command reply header to payload buffer");
- goto end_no_reply;
- }
-
- if (reply_code == LTTNG_OK) {
- buf_ret = lttng_dynamic_buffer_append(&reply_payload,
- closed_trace_chunk_path, path_length);
- if (buf_ret) {
- ERR("Failed to append \"close trace chunk\" command reply path to payload buffer");
- goto end_no_reply;
- }
- }
-
- send_ret = conn->sock->ops->sendmsg(conn->sock,
- reply_payload.data,
- reply_payload.size,
- 0);
- if (send_ret < reply_payload.size) {
- ERR("Failed to send \"close trace chunk\" command reply of %zu bytes (ret = %zd)",
- reply_payload.size, send_ret);
- ret = -1;
- goto end_no_reply;
- }
-end_no_reply:
- lttng_trace_chunk_put(chunk);
- lttng_dynamic_buffer_reset(&reply_payload);
- return ret;
-}
-
-/*
- * relay_trace_chunk_exists: check if a trace chunk exists
- */
-static int relay_trace_chunk_exists(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- ssize_t send_ret;
- struct relay_session *session = conn->session;
- struct lttcomm_relayd_trace_chunk_exists *msg;
- struct lttcomm_relayd_trace_chunk_exists_reply reply = {};
- struct lttng_buffer_view header_view;
- uint64_t chunk_id;
- bool chunk_exists;
-
- if (!session || !conn->version_check_done) {
- ERR("Trying to check for the existance of a trace chunk before version check");
- ret = -1;
- goto end_no_reply;
- }
-
- if (session->major == 2 && session->minor < 11) {
- ERR("Chunk exists command is unsupported before 2.11");
- ret = -1;
- goto end_no_reply;
- }
-
- header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
- if (!lttng_buffer_view_is_valid(&header_view)) {
- ERR("Failed to receive payload of chunk exists command");
- ret = -1;
- goto end_no_reply;
- }
-
- /* Convert to host endianness. */
- msg = (typeof(msg)) header_view.data;
- chunk_id = be64toh(msg->chunk_id);
-
- ret = sessiond_trace_chunk_registry_chunk_exists(
- sessiond_trace_chunk_registry,
- conn->session->sessiond_uuid,
- conn->session->id,
- chunk_id, &chunk_exists);
- /*
- * If ret is not 0, send the reply and report the error to the caller.
- * It is a protocol (or internal) error and the session/connection
- * should be torn down.
- */
- reply = (typeof(reply)){
- .generic.ret_code = htobe32((uint32_t)
- (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
- .trace_chunk_exists = ret == 0 ? chunk_exists : 0,
- };
- send_ret = conn->sock->ops->sendmsg(
- conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"create trace chunk\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-end_no_reply:
- return ret;
-}
-
-/*
- * relay_get_configuration: query whether feature is available
- */
-static int relay_get_configuration(const struct lttcomm_relayd_hdr *recv_hdr,
- struct relay_connection *conn,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
- ssize_t send_ret;
- struct lttcomm_relayd_get_configuration *msg;
- struct lttcomm_relayd_get_configuration_reply reply = {};
- struct lttng_buffer_view header_view;
- uint64_t query_flags = 0;
- uint64_t result_flags = 0;
-
- header_view = lttng_buffer_view_from_view(payload, 0, sizeof(*msg));
- if (!lttng_buffer_view_is_valid(&header_view)) {
- ERR("Failed to receive payload of chunk close command");
- ret = -1;
- goto end_no_reply;
- }
-
- /* Convert to host endianness. */
- msg = (typeof(msg)) header_view.data;
- query_flags = be64toh(msg->query_flags);
-
- if (query_flags) {
- ret = LTTNG_ERR_INVALID_PROTOCOL;
- goto reply;
- }
- if (opt_allow_clear) {
- result_flags |= LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED;
- }
- ret = 0;
-reply:
- reply = (typeof(reply)){
- .generic.ret_code = htobe32((uint32_t)
- (ret == 0 ? LTTNG_OK : LTTNG_ERR_INVALID_PROTOCOL)),
- .relayd_configuration_flags = htobe64(result_flags),
- };
- send_ret = conn->sock->ops->sendmsg(
- conn->sock, &reply, sizeof(reply), 0);
- if (send_ret < (ssize_t) sizeof(reply)) {
- ERR("Failed to send \"get configuration\" command reply (ret = %zd)",
- send_ret);
- ret = -1;
- }
-end_no_reply:
- return ret;
-}
-
-#define DBG_CMD(cmd_name, conn) \
- DBG3("Processing \"%s\" command for socket %i", cmd_name, conn->sock->fd);
-
-static int relay_process_control_command(struct relay_connection *conn,
- const struct lttcomm_relayd_hdr *header,
- const struct lttng_buffer_view *payload)
-{
- int ret = 0;
-
- switch (header->cmd) {
- case RELAYD_CREATE_SESSION:
- DBG_CMD("RELAYD_CREATE_SESSION", conn);
- ret = relay_create_session(header, conn, payload);
- break;
- case RELAYD_ADD_STREAM:
- DBG_CMD("RELAYD_ADD_STREAM", conn);
- ret = relay_add_stream(header, conn, payload);
- break;
- case RELAYD_START_DATA:
- DBG_CMD("RELAYD_START_DATA", conn);
- ret = relay_start(header, conn, payload);
- break;
- case RELAYD_SEND_METADATA:
- DBG_CMD("RELAYD_SEND_METADATA", conn);
- ret = relay_recv_metadata(header, conn, payload);
- break;
- case RELAYD_VERSION:
- DBG_CMD("RELAYD_VERSION", conn);
- ret = relay_send_version(header, conn, payload);
- break;
- case RELAYD_CLOSE_STREAM:
- DBG_CMD("RELAYD_CLOSE_STREAM", conn);
- ret = relay_close_stream(header, conn, payload);
- break;
- case RELAYD_DATA_PENDING:
- DBG_CMD("RELAYD_DATA_PENDING", conn);
- ret = relay_data_pending(header, conn, payload);
- break;
- case RELAYD_QUIESCENT_CONTROL:
- DBG_CMD("RELAYD_QUIESCENT_CONTROL", conn);
- ret = relay_quiescent_control(header, conn, payload);
- break;
- case RELAYD_BEGIN_DATA_PENDING:
- DBG_CMD("RELAYD_BEGIN_DATA_PENDING", conn);
- ret = relay_begin_data_pending(header, conn, payload);
- break;
- case RELAYD_END_DATA_PENDING:
- DBG_CMD("RELAYD_END_DATA_PENDING", conn);
- ret = relay_end_data_pending(header, conn, payload);
- break;
- case RELAYD_SEND_INDEX:
- DBG_CMD("RELAYD_SEND_INDEX", conn);
- ret = relay_recv_index(header, conn, payload);
- break;
- case RELAYD_STREAMS_SENT:
- DBG_CMD("RELAYD_STREAMS_SENT", conn);
- ret = relay_streams_sent(header, conn, payload);
- break;
- case RELAYD_RESET_METADATA:
- DBG_CMD("RELAYD_RESET_METADATA", conn);
- ret = relay_reset_metadata(header, conn, payload);
- break;
- case RELAYD_ROTATE_STREAMS:
- DBG_CMD("RELAYD_ROTATE_STREAMS", conn);
- ret = relay_rotate_session_streams(header, conn, payload);
- break;
- case RELAYD_CREATE_TRACE_CHUNK:
- DBG_CMD("RELAYD_CREATE_TRACE_CHUNK", conn);
- ret = relay_create_trace_chunk(header, conn, payload);
- break;
- case RELAYD_CLOSE_TRACE_CHUNK:
- DBG_CMD("RELAYD_CLOSE_TRACE_CHUNK", conn);
- ret = relay_close_trace_chunk(header, conn, payload);
- break;
- case RELAYD_TRACE_CHUNK_EXISTS:
- DBG_CMD("RELAYD_TRACE_CHUNK_EXISTS", conn);
- ret = relay_trace_chunk_exists(header, conn, payload);
- break;
- case RELAYD_GET_CONFIGURATION:
- DBG_CMD("RELAYD_GET_CONFIGURATION", conn);
- ret = relay_get_configuration(header, conn, payload);
- break;
- case RELAYD_UPDATE_SYNC_INFO:
- default:
- ERR("Received unknown command (%u)", header->cmd);
- relay_unknown_command(conn);
- ret = -1;
- goto end;
- }
-
-end:
- return ret;
-}
-
-static enum relay_connection_status relay_process_control_receive_payload(
- struct relay_connection *conn)
-{
- int ret = 0;
- enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
- struct lttng_dynamic_buffer *reception_buffer =
- &conn->protocol.ctrl.reception_buffer;
- struct ctrl_connection_state_receive_payload *state =
- &conn->protocol.ctrl.state.receive_payload;
- struct lttng_buffer_view payload_view;
-
- if (state->left_to_receive == 0) {
- /* Short-circuit for payload-less commands. */
- goto reception_complete;
- }
-
- ret = conn->sock->ops->recvmsg(conn->sock,
- reception_buffer->data + state->received,
- state->left_to_receive, MSG_DONTWAIT);
- if (ret < 0) {
- if (errno != EAGAIN && errno != EWOULDBLOCK) {
- PERROR("Unable to receive command payload on sock %d",
- conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_ERROR;
- }
- goto end;
- } else if (ret == 0) {
- DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_CLOSED;
- goto end;
- }
-
- LTTNG_ASSERT(ret > 0);
- LTTNG_ASSERT(ret <= state->left_to_receive);
-
- state->left_to_receive -= ret;
- state->received += ret;
-
- if (state->left_to_receive > 0) {
- /*
- * Can't transition to the protocol's next state, wait to
- * receive the rest of the header.
- */
- DBG3("Partial reception of control connection protocol payload (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
- state->received, state->left_to_receive,
- conn->sock->fd);
- goto end;
- }
-
-reception_complete:
- DBG("Done receiving control command payload: fd = %i, payload size = %" PRIu64 " bytes",
- conn->sock->fd, state->received);
- /*
- * The payload required to process the command has been received.
- * A view to the reception buffer is forwarded to the various
- * commands and the state of the control is reset on success.
- *
- * Commands are responsible for sending their reply to the peer.
- */
- payload_view = lttng_buffer_view_from_dynamic_buffer(reception_buffer,
- 0, -1);
- ret = relay_process_control_command(conn,
- &state->header, &payload_view);
- if (ret < 0) {
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end;
- }
-
- ret = connection_reset_protocol_state(conn);
- if (ret) {
- status = RELAY_CONNECTION_STATUS_ERROR;
- }
-end:
- return status;
-}
-
-static enum relay_connection_status relay_process_control_receive_header(
- struct relay_connection *conn)
-{
- int ret = 0;
- enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
- struct lttcomm_relayd_hdr header;
- struct lttng_dynamic_buffer *reception_buffer =
- &conn->protocol.ctrl.reception_buffer;
- struct ctrl_connection_state_receive_header *state =
- &conn->protocol.ctrl.state.receive_header;
-
- LTTNG_ASSERT(state->left_to_receive != 0);
-
- ret = conn->sock->ops->recvmsg(conn->sock,
- reception_buffer->data + state->received,
- state->left_to_receive, MSG_DONTWAIT);
- if (ret < 0) {
- if (errno != EAGAIN && errno != EWOULDBLOCK) {
- PERROR("Unable to receive control command header on sock %d",
- conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_ERROR;
- }
- goto end;
- } else if (ret == 0) {
- DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_CLOSED;
- goto end;
- }
-
- LTTNG_ASSERT(ret > 0);
- LTTNG_ASSERT(ret <= state->left_to_receive);
-
- state->left_to_receive -= ret;
- state->received += ret;
-
- if (state->left_to_receive > 0) {
- /*
- * Can't transition to the protocol's next state, wait to
- * receive the rest of the header.
- */
- DBG3("Partial reception of control connection protocol header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
- state->received, state->left_to_receive,
- conn->sock->fd);
- goto end;
- }
-
- /* Transition to next state: receiving the command's payload. */
- conn->protocol.ctrl.state_id =
- CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD;
- memcpy(&header, reception_buffer->data, sizeof(header));
- header.circuit_id = be64toh(header.circuit_id);
- header.data_size = be64toh(header.data_size);
- header.cmd = be32toh(header.cmd);
- header.cmd_version = be32toh(header.cmd_version);
- memcpy(&conn->protocol.ctrl.state.receive_payload.header,
- &header, sizeof(header));
-
- DBG("Done receiving control command header: fd = %i, cmd = %" PRIu32 ", cmd_version = %" PRIu32 ", payload size = %" PRIu64 " bytes",
- conn->sock->fd, header.cmd, header.cmd_version,
- header.data_size);
-
- if (header.data_size > DEFAULT_NETWORK_RELAYD_CTRL_MAX_PAYLOAD_SIZE) {
- ERR("Command header indicates a payload (%" PRIu64 " bytes) that exceeds the maximal payload size allowed on a control connection.",
- header.data_size);
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end;
- }
-
- conn->protocol.ctrl.state.receive_payload.left_to_receive =
- header.data_size;
- conn->protocol.ctrl.state.receive_payload.received = 0;
- ret = lttng_dynamic_buffer_set_size(reception_buffer,
- header.data_size);
- if (ret) {
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end;
- }
-
- if (header.data_size == 0) {
- /*
- * Manually invoke the next state as the poll loop
- * will not wake-up to allow us to proceed further.
- */
- status = relay_process_control_receive_payload(conn);
- }
-end:
- return status;
-}
-
-/*
- * Process the commands received on the control socket
- */
-static enum relay_connection_status relay_process_control(
- struct relay_connection *conn)
-{
- enum relay_connection_status status;
-
- switch (conn->protocol.ctrl.state_id) {
- case CTRL_CONNECTION_STATE_RECEIVE_HEADER:
- status = relay_process_control_receive_header(conn);
- break;
- case CTRL_CONNECTION_STATE_RECEIVE_PAYLOAD:
- status = relay_process_control_receive_payload(conn);
- break;
- default:
- ERR("Unknown control connection protocol state encountered.");
- abort();
- }
-
- return status;
-}
-
-static enum relay_connection_status relay_process_data_receive_header(
- struct relay_connection *conn)
-{
- int ret;
- enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
- struct data_connection_state_receive_header *state =
- &conn->protocol.data.state.receive_header;
- struct lttcomm_relayd_data_hdr header;
- struct relay_stream *stream;
-
- LTTNG_ASSERT(state->left_to_receive != 0);
-
- ret = conn->sock->ops->recvmsg(conn->sock,
- state->header_reception_buffer + state->received,
- state->left_to_receive, MSG_DONTWAIT);
- if (ret < 0) {
- if (errno != EAGAIN && errno != EWOULDBLOCK) {
- PERROR("Unable to receive data header on sock %d", conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_ERROR;
- }
- goto end;
- } else if (ret == 0) {
- /* Orderly shutdown. Not necessary to print an error. */
- DBG("Socket %d performed an orderly shutdown (received EOF)", conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_CLOSED;
- goto end;
- }
-
- LTTNG_ASSERT(ret > 0);
- LTTNG_ASSERT(ret <= state->left_to_receive);
-
- state->left_to_receive -= ret;
- state->received += ret;
-
- if (state->left_to_receive > 0) {
- /*
- * Can't transition to the protocol's next state, wait to
- * receive the rest of the header.
- */
- DBG3("Partial reception of data connection header (received %" PRIu64 " bytes, %" PRIu64 " bytes left to receive, fd = %i)",
- state->received, state->left_to_receive,
- conn->sock->fd);
- goto end;
- }
-
- /* Transition to next state: receiving the payload. */
- conn->protocol.data.state_id = DATA_CONNECTION_STATE_RECEIVE_PAYLOAD;
-
- memcpy(&header, state->header_reception_buffer, sizeof(header));
- header.circuit_id = be64toh(header.circuit_id);
- header.stream_id = be64toh(header.stream_id);
- header.data_size = be32toh(header.data_size);
- header.net_seq_num = be64toh(header.net_seq_num);
- header.padding_size = be32toh(header.padding_size);
- memcpy(&conn->protocol.data.state.receive_payload.header, &header, sizeof(header));
-
- conn->protocol.data.state.receive_payload.left_to_receive =
- header.data_size;
- conn->protocol.data.state.receive_payload.received = 0;
- conn->protocol.data.state.receive_payload.rotate_index = false;
-
- DBG("Received data connection header on fd %i: circuit_id = %" PRIu64 ", stream_id = %" PRIu64 ", data_size = %" PRIu32 ", net_seq_num = %" PRIu64 ", padding_size = %" PRIu32,
- conn->sock->fd, header.circuit_id,
- header.stream_id, header.data_size,
- header.net_seq_num, header.padding_size);
-
- stream = stream_get_by_id(header.stream_id);
- if (!stream) {
- DBG("relay_process_data_receive_payload: Cannot find stream %" PRIu64,
- header.stream_id);
- /* Protocol error. */
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end;
- }
-
- pthread_mutex_lock(&stream->lock);
- /* Prepare stream for the reception of a new packet. */
- ret = stream_init_packet(stream, header.data_size,
- &conn->protocol.data.state.receive_payload.rotate_index);
- pthread_mutex_unlock(&stream->lock);
- if (ret) {
- ERR("Failed to rotate stream output file");
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end_stream_unlock;
- }
-
-end_stream_unlock:
- stream_put(stream);
-end:
- return status;
-}
-
-static enum relay_connection_status relay_process_data_receive_payload(
- struct relay_connection *conn)
-{
- int ret;
- enum relay_connection_status status = RELAY_CONNECTION_STATUS_OK;
- struct relay_stream *stream;
- struct data_connection_state_receive_payload *state =
- &conn->protocol.data.state.receive_payload;
- const size_t chunk_size = RECV_DATA_BUFFER_SIZE;
- char data_buffer[chunk_size];
- bool partial_recv = false;
- bool new_stream = false, close_requested = false, index_flushed = false;
- uint64_t left_to_receive = state->left_to_receive;
- struct relay_session *session;
-
- DBG3("Receiving data for stream id %" PRIu64 " seqnum %" PRIu64 ", %" PRIu64" bytes received, %" PRIu64 " bytes left to receive",
- state->header.stream_id, state->header.net_seq_num,
- state->received, left_to_receive);
-
- stream = stream_get_by_id(state->header.stream_id);
- if (!stream) {
- /* Protocol error. */
- ERR("relay_process_data_receive_payload: cannot find stream %" PRIu64,
- state->header.stream_id);
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end;
- }
-
- pthread_mutex_lock(&stream->lock);
- session = stream->trace->session;
- if (!conn->session) {
- ret = connection_set_session(conn, session);
- if (ret) {
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end_stream_unlock;
- }
- }
-
- /*
- * The size of the "chunk" received on any iteration is bounded by:
- * - the data left to receive,
- * - the data immediately available on the socket,
- * - the on-stack data buffer
- */
- while (left_to_receive > 0 && !partial_recv) {
- size_t recv_size = min(left_to_receive, chunk_size);
- struct lttng_buffer_view packet_chunk;
-
- ret = conn->sock->ops->recvmsg(conn->sock, data_buffer,
- recv_size, MSG_DONTWAIT);
- if (ret < 0) {
- if (errno != EAGAIN && errno != EWOULDBLOCK) {
- PERROR("Socket %d error", conn->sock->fd);
- status = RELAY_CONNECTION_STATUS_ERROR;
- }
- goto end_stream_unlock;
- } else if (ret == 0) {
- /* No more data ready to be consumed on socket. */
- DBG3("No more data ready for consumption on data socket of stream id %" PRIu64,
- state->header.stream_id);
- status = RELAY_CONNECTION_STATUS_CLOSED;
- break;
- } else if (ret < (int) recv_size) {
- /*
- * All the data available on the socket has been
- * consumed.
- */
- partial_recv = true;
- recv_size = ret;
- }
-
- packet_chunk = lttng_buffer_view_init(data_buffer,
- 0, recv_size);
- LTTNG_ASSERT(packet_chunk.data);
-
- ret = stream_write(stream, &packet_chunk, 0);
- if (ret) {
- ERR("Relay error writing data to file");
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end_stream_unlock;
- }
-
- left_to_receive -= recv_size;
- state->received += recv_size;
- state->left_to_receive = left_to_receive;
- }
-
- if (state->left_to_receive > 0) {
- /*
- * Did not receive all the data expected, wait for more data to
- * become available on the socket.
- */
- DBG3("Partial receive on data connection of stream id %" PRIu64 ", %" PRIu64 " bytes received, %" PRIu64 " bytes left to receive",
- state->header.stream_id, state->received,
- state->left_to_receive);
- goto end_stream_unlock;
- }
-
- ret = stream_write(stream, NULL, state->header.padding_size);
- if (ret) {
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end_stream_unlock;
- }
-
- if (session_streams_have_index(session)) {
- ret = stream_update_index(stream, state->header.net_seq_num,
- state->rotate_index, &index_flushed,
- state->header.data_size + state->header.padding_size);
- if (ret < 0) {
- ERR("Failed to update index: stream %" PRIu64 " net_seq_num %" PRIu64 " ret %d",
- stream->stream_handle,
- state->header.net_seq_num, ret);
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end_stream_unlock;
- }
- }
-
- if (stream->prev_data_seq == -1ULL) {
- new_stream = true;
- }
-
- ret = stream_complete_packet(stream, state->header.data_size +
- state->header.padding_size, state->header.net_seq_num,
- index_flushed);
- if (ret) {
- status = RELAY_CONNECTION_STATUS_ERROR;
- goto end_stream_unlock;
- }
-
- /*
- * Resetting the protocol state (to RECEIVE_HEADER) will trash the
- * contents of *state which are aliased (union) to the same location as
- * the new state. Don't use it beyond this point.
- */
- connection_reset_protocol_state(conn);
- state = NULL;
-
-end_stream_unlock:
- close_requested = stream->close_requested;
- pthread_mutex_unlock(&stream->lock);
- if (close_requested && left_to_receive == 0) {
- try_stream_close(stream);
- }
-
- if (new_stream) {
- pthread_mutex_lock(&session->lock);
- uatomic_set(&session->new_streams, 1);
- pthread_mutex_unlock(&session->lock);
- }
-
- stream_put(stream);
-end:
- return status;
-}
-
-/*
- * relay_process_data: Process the data received on the data socket
- */
-static enum relay_connection_status relay_process_data(
- struct relay_connection *conn)
-{
- enum relay_connection_status status;
-
- switch (conn->protocol.data.state_id) {
- case DATA_CONNECTION_STATE_RECEIVE_HEADER:
- status = relay_process_data_receive_header(conn);
- break;
- case DATA_CONNECTION_STATE_RECEIVE_PAYLOAD:
- status = relay_process_data_receive_payload(conn);
- break;
- default:
- ERR("Unexpected data connection communication state.");
- abort();
- }
-
- return status;
-}
-
-static void cleanup_connection_pollfd(struct lttng_poll_event *events, int pollfd)
-{
- int ret;
-
- (void) lttng_poll_del(events, pollfd);
-
- ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, &pollfd, 1,
- fd_tracker_util_close_fd, NULL);
- if (ret < 0) {
- ERR("Closing pollfd %d", pollfd);
- }
-}
-
-static void relay_thread_close_connection(struct lttng_poll_event *events,
- int pollfd, struct relay_connection *conn)
-{
- const char *type_str;
-
- switch (conn->type) {
- case RELAY_DATA:
- type_str = "Data";
- break;
- case RELAY_CONTROL:
- type_str = "Control";
- break;
- case RELAY_VIEWER_COMMAND:
- type_str = "Viewer Command";
- break;
- case RELAY_VIEWER_NOTIFICATION:
- type_str = "Viewer Notification";
- break;
- default:
- type_str = "Unknown";
- }
- cleanup_connection_pollfd(events, pollfd);
- connection_put(conn);
- DBG("%s connection closed with %d", type_str, pollfd);
-}
-
-/*
- * This thread does the actual work
- */
-static void *relay_thread_worker(void *data)
-{
- int ret, err = -1, last_seen_data_fd = -1;
- uint32_t nb_fd;
- struct lttng_poll_event events;
- struct lttng_ht *relay_connections_ht;
- struct lttng_ht_iter iter;
- struct relay_connection *destroy_conn = NULL;
-
- DBG("[thread] Relay worker started");
-
- rcu_register_thread();
-
- health_register(health_relayd, HEALTH_RELAYD_TYPE_WORKER);
-
- if (testpoint(relayd_thread_worker)) {
- goto error_testpoint;
- }
-
- health_code_update();
-
- /* table of connections indexed on socket */
- relay_connections_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
- if (!relay_connections_ht) {
- goto relay_connections_ht_error;
- }
-
- ret = create_named_thread_poll_set(&events, 2, "Worker thread epoll");
- if (ret < 0) {
- goto error_poll_create;
- }
-
- ret = lttng_poll_add(&events, relay_conn_pipe[0], LPOLLIN | LPOLLRDHUP);
- if (ret < 0) {
- goto error;
- }
-
-restart:
- while (1) {
- int idx = -1, i, seen_control = 0, last_notdel_data_fd = -1;
-
- health_code_update();
-
- /* Infinite blocking call, waiting for transmission */
- DBG3("Relayd worker thread polling...");
- health_poll_entry();
- ret = lttng_poll_wait(&events, -1);
- health_poll_exit();
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- /*
- * Process control. The control connection is
- * prioritized so we don't starve it with high
- * throughput tracing data on the data connection.
- */
- for (i = 0; i < nb_fd; i++) {
- /* Fetch once the poll data */
- uint32_t revents = LTTNG_POLL_GETEV(&events, i);
- int pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- /* Thread quit pipe has been closed. Killing thread. */
- ret = check_thread_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Inspect the relay conn pipe for new connection */
- if (pollfd == relay_conn_pipe[0]) {
- if (revents & LPOLLIN) {
- struct relay_connection *conn;
-
- ret = lttng_read(relay_conn_pipe[0], &conn, sizeof(conn));
- if (ret < 0) {
- goto error;
- }
- ret = lttng_poll_add(&events,
- conn->sock->fd,
- LPOLLIN | LPOLLRDHUP);
- if (ret) {
- ERR("Failed to add new connection file descriptor to poll set");
- goto error;
- }
- connection_ht_add(relay_connections_ht, conn);
- DBG("Connection socket %d added", conn->sock->fd);
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Relay connection pipe error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- } else {
- struct relay_connection *ctrl_conn;
-
- ctrl_conn = connection_get_by_sock(relay_connections_ht, pollfd);
- /* If not found, there is a synchronization issue. */
- LTTNG_ASSERT(ctrl_conn);
-
- if (ctrl_conn->type == RELAY_DATA) {
- if (revents & LPOLLIN) {
- /*
- * Flag the last seen data fd not deleted. It will be
- * used as the last seen fd if any fd gets deleted in
- * this first loop.
- */
- last_notdel_data_fd = pollfd;
- }
- goto put_ctrl_connection;
- }
- LTTNG_ASSERT(ctrl_conn->type == RELAY_CONTROL);
-
- if (revents & LPOLLIN) {
- enum relay_connection_status status;
-
- status = relay_process_control(ctrl_conn);
- if (status != RELAY_CONNECTION_STATUS_OK) {
- /*
- * On socket error flag the session as aborted to force
- * the cleanup of its stream otherwise it can leak
- * during the lifetime of the relayd.
- *
- * This prevents situations in which streams can be
- * left opened because an index was received, the
- * control connection is closed, and the data
- * connection is closed (uncleanly) before the packet's
- * data provided.
- *
- * Since the control connection encountered an error,
- * it is okay to be conservative and close the
- * session right now as we can't rely on the protocol
- * being respected anymore.
- */
- if (status == RELAY_CONNECTION_STATUS_ERROR) {
- session_abort(ctrl_conn->session);
- }
-
- /* Clear the connection on error or close. */
- relay_thread_close_connection(&events,
- pollfd,
- ctrl_conn);
- }
- seen_control = 1;
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- relay_thread_close_connection(&events,
- pollfd, ctrl_conn);
- if (last_seen_data_fd == pollfd) {
- last_seen_data_fd = last_notdel_data_fd;
- }
- } else {
- ERR("Unexpected poll events %u for control sock %d",
- revents, pollfd);
- connection_put(ctrl_conn);
- goto error;
- }
- put_ctrl_connection:
- connection_put(ctrl_conn);
- }
- }
-
- /*
- * The last loop handled a control request, go back to poll to make
- * sure we prioritise the control socket.
- */
- if (seen_control) {
- continue;
- }
-
- if (last_seen_data_fd >= 0) {
- for (i = 0; i < nb_fd; i++) {
- int pollfd = LTTNG_POLL_GETFD(&events, i);
-
- health_code_update();
-
- if (last_seen_data_fd == pollfd) {
- idx = i;
- break;
- }
- }
- }
-
- /* Process data connection. */
- for (i = idx + 1; i < nb_fd; i++) {
- /* Fetch the poll data. */
- uint32_t revents = LTTNG_POLL_GETEV(&events, i);
- int pollfd = LTTNG_POLL_GETFD(&events, i);
- struct relay_connection *data_conn;
-
- health_code_update();
-
- if (!revents) {
- /* No activity for this FD (poll implementation). */
- continue;
- }
-
- /* Skip the command pipe. It's handled in the first loop. */
- if (pollfd == relay_conn_pipe[0]) {
- continue;
- }
-
- data_conn = connection_get_by_sock(relay_connections_ht, pollfd);
- if (!data_conn) {
- /* Skip it. Might be removed before. */
- continue;
- }
- if (data_conn->type == RELAY_CONTROL) {
- goto put_data_connection;
- }
- LTTNG_ASSERT(data_conn->type == RELAY_DATA);
-
- if (revents & LPOLLIN) {
- enum relay_connection_status status;
-
- status = relay_process_data(data_conn);
- /* Connection closed or error. */
- if (status != RELAY_CONNECTION_STATUS_OK) {
- /*
- * On socket error flag the session as aborted to force
- * the cleanup of its stream otherwise it can leak
- * during the lifetime of the relayd.
- *
- * This prevents situations in which streams can be
- * left opened because an index was received, the
- * control connection is closed, and the data
- * connection is closed (uncleanly) before the packet's
- * data provided.
- *
- * Since the data connection encountered an error,
- * it is okay to be conservative and close the
- * session right now as we can't rely on the protocol
- * being respected anymore.
- */
- if (status == RELAY_CONNECTION_STATUS_ERROR) {
- session_abort(data_conn->session);
- }
- relay_thread_close_connection(&events, pollfd,
- data_conn);
- /*
- * Every goto restart call sets the last seen fd where
- * here we don't really care since we gracefully
- * continue the loop after the connection is deleted.
- */
- } else {
- /* Keep last seen port. */
- last_seen_data_fd = pollfd;
- connection_put(data_conn);
- goto restart;
- }
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- relay_thread_close_connection(&events, pollfd,
- data_conn);
- } else {
- ERR("Unknown poll events %u for data sock %d",
- revents, pollfd);
- }
- put_data_connection:
- connection_put(data_conn);
- }
- last_seen_data_fd = -1;
- }
-
- /* Normal exit, no error */
- ret = 0;
-
-exit:
-error:
- /* Cleanup remaining connection object. */
- rcu_read_lock();
- cds_lfht_for_each_entry(relay_connections_ht->ht, &iter.iter,
- destroy_conn,
- sock_n.node) {
- health_code_update();
-
- session_abort(destroy_conn->session);
-
- /*
- * No need to grab another ref, because we own
- * destroy_conn.
- */
- relay_thread_close_connection(&events, destroy_conn->sock->fd,
- destroy_conn);
- }
- rcu_read_unlock();
-
- (void) fd_tracker_util_poll_clean(the_fd_tracker, &events);
-error_poll_create:
- lttng_ht_destroy(relay_connections_ht);
-relay_connections_ht_error:
- /* Close relay conn pipes */
- (void) fd_tracker_util_pipe_close(the_fd_tracker,
- relay_conn_pipe);
- if (err) {
- DBG("Thread exited with error");
- }
- DBG("Worker thread cleanup complete");
-error_testpoint:
- if (err) {
- health_error();
- ERR("Health error occurred in %s", __func__);
- }
- health_unregister(health_relayd);
- rcu_unregister_thread();
- lttng_relay_stop_threads();
- return NULL;
-}
-
-/*
- * Create the relay command pipe to wake thread_manage_apps.
- * Closed in cleanup().
- */
-static int create_relay_conn_pipe(void)
-{
- return fd_tracker_util_pipe_open_cloexec(the_fd_tracker,
- "Relayd connection pipe", relay_conn_pipe);
-}
-
-static int stdio_open(void *data, int *fds)
-{
- fds[0] = fileno(stdout);
- fds[1] = fileno(stderr);
- return 0;
-}
-
-static int track_stdio(void)
-{
- int fds[2];
- const char *names[] = { "stdout", "stderr" };
-
- return fd_tracker_open_unsuspendable_fd(the_fd_tracker, fds,
- names, 2, stdio_open, NULL);
-}
-
-/*
- * main
- */
-int main(int argc, char **argv)
-{
- bool thread_is_rcu_registered = false;
- int ret = 0, retval = 0;
- void *status;
- char *unlinked_file_directory_path = NULL, *output_path = NULL;
-
- /* Parse environment variables */
- ret = parse_env_options();
- if (ret) {
- retval = -1;
- goto exit_options;
- }
-
- /*
- * Parse arguments.
- * Command line arguments overwrite environment.
- */
- progname = argv[0];
- if (set_options(argc, argv)) {
- retval = -1;
- goto exit_options;
- }
-
- if (set_signal_handler()) {
- retval = -1;
- goto exit_options;
- }
-
- relayd_config_log();
-
- if (opt_print_version) {
- print_version();
- retval = 0;
- goto exit_options;
- }
-
- ret = fclose(stdin);
- if (ret) {
- PERROR("Failed to close stdin");
- goto exit_options;
- }
-
- DBG("Clear command %s", opt_allow_clear ? "allowed" : "disallowed");
-
- /* Try to create directory if -o, --output is specified. */
- if (opt_output_path) {
- if (*opt_output_path != '/') {
- ERR("Please specify an absolute path for -o, --output PATH");
- retval = -1;
- goto exit_options;
- }
-
- ret = utils_mkdir_recursive(opt_output_path, S_IRWXU | S_IRWXG,
- -1, -1);
- if (ret < 0) {
- ERR("Unable to create %s", opt_output_path);
- retval = -1;
- goto exit_options;
- }
- }
-
- /* Daemonize */
- if (opt_daemon || opt_background) {
- ret = lttng_daemonize(&child_ppid, &recv_child_signal,
- !opt_background);
- if (ret < 0) {
- retval = -1;
- goto exit_options;
- }
- }
-
- if (opt_working_directory) {
- ret = utils_change_working_directory(opt_working_directory);
- if (ret) {
- /* All errors are already logged. */
- goto exit_options;
- }
- }
-
- sessiond_trace_chunk_registry = sessiond_trace_chunk_registry_create();
- if (!sessiond_trace_chunk_registry) {
- ERR("Failed to initialize session daemon trace chunk registry");
- retval = -1;
- goto exit_options;
- }
-
- /*
- * The RCU thread registration (and use, through the fd-tracker's
- * creation) is done after the daemonization to allow us to not
- * deal with liburcu's fork() management as the call RCU needs to
- * be restored.
- */
- rcu_register_thread();
- thread_is_rcu_registered = true;
-
- output_path = create_output_path("");
- if (!output_path) {
- ERR("Failed to get output path");
- retval = -1;
- goto exit_options;
- }
- ret = asprintf(&unlinked_file_directory_path, "%s/%s", output_path,
- DEFAULT_UNLINKED_FILES_DIRECTORY);
- free(output_path);
- if (ret < 0) {
- ERR("Failed to format unlinked file directory path");
- retval = -1;
- goto exit_options;
- }
- the_fd_tracker = fd_tracker_create(
- unlinked_file_directory_path, lttng_opt_fd_pool_size);
- free(unlinked_file_directory_path);
- if (!the_fd_tracker) {
- retval = -1;
- goto exit_options;
- }
-
- ret = track_stdio();
- if (ret) {
- retval = -1;
- goto exit_options;
- }
-
- /* Initialize thread health monitoring */
- health_relayd = health_app_create(NR_HEALTH_RELAYD_TYPES);
- if (!health_relayd) {
- PERROR("health_app_create error");
- retval = -1;
- goto exit_options;
- }
-
- /* Create thread quit pipe */
- if (init_thread_quit_pipe()) {
- retval = -1;
- goto exit_options;
- }
-
- /* Setup the thread apps communication pipe. */
- if (create_relay_conn_pipe()) {
- retval = -1;
- goto exit_options;
- }
-
- /* Init relay command queue. */
- cds_wfcq_init(&relay_conn_queue.head, &relay_conn_queue.tail);
-
- /* Initialize communication library */
- lttcomm_init();
- lttcomm_inet_init();
-
- /* tables of sessions indexed by session ID */
- sessions_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!sessions_ht) {
- retval = -1;
- goto exit_options;
- }
-
- /* tables of streams indexed by stream ID */
- relay_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!relay_streams_ht) {
- retval = -1;
- goto exit_options;
- }
-
- /* tables of streams indexed by stream ID */
- viewer_streams_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64);
- if (!viewer_streams_ht) {
- retval = -1;
- goto exit_options;
- }
-
- ret = init_health_quit_pipe();
- if (ret) {
- retval = -1;
- goto exit_options;
- }
-
- /* Create thread to manage the client socket */
- ret = pthread_create(&health_thread, default_pthread_attr(),
- thread_manage_health, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create health");
- retval = -1;
- goto exit_options;
- }
-
- /* Setup the dispatcher thread */
- ret = pthread_create(&dispatcher_thread, default_pthread_attr(),
- relay_thread_dispatcher, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create dispatcher");
- retval = -1;
- goto exit_dispatcher_thread;
- }
-
- /* Setup the worker thread */
- ret = pthread_create(&worker_thread, default_pthread_attr(),
- relay_thread_worker, NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create worker");
- retval = -1;
- goto exit_worker_thread;
- }
-
- /* Setup the listener thread */
- ret = pthread_create(&listener_thread, default_pthread_attr(),
- relay_thread_listener, (void *) NULL);
- if (ret) {
- errno = ret;
- PERROR("pthread_create listener");
- retval = -1;
- goto exit_listener_thread;
- }
-
- ret = relayd_live_create(live_uri);
- if (ret) {
- ERR("Starting live viewer threads");
- retval = -1;
- goto exit_live;
- }
-
- /*
- * This is where we start awaiting program completion (e.g. through
- * signal that asks threads to teardown).
- */
-
- ret = relayd_live_join();
- if (ret) {
- retval = -1;
- }
-exit_live:
-
- ret = pthread_join(listener_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join listener_thread");
- retval = -1;
- }
-
-exit_listener_thread:
- ret = pthread_join(worker_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join worker_thread");
- retval = -1;
- }
-
-exit_worker_thread:
- ret = pthread_join(dispatcher_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join dispatcher_thread");
- retval = -1;
- }
-exit_dispatcher_thread:
-
- ret = pthread_join(health_thread, &status);
- if (ret) {
- errno = ret;
- PERROR("pthread_join health_thread");
- retval = -1;
- }
-exit_options:
- /*
- * Wait for all pending call_rcu work to complete before tearing
- * down data structures. call_rcu worker may be trying to
- * perform lookups in those structures.
- */
- rcu_barrier();
- relayd_cleanup();
-
- /* Ensure all prior call_rcu are done. */
- rcu_barrier();
-
- if (thread_is_rcu_registered) {
- rcu_unregister_thread();
- }
-
- if (!retval) {
- exit(EXIT_SUCCESS);
- } else {
- exit(EXIT_FAILURE);
- }
-}
projects / lttng-tools.git / blobdiff