+++ /dev/null
-/*
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <getopt.h>
-#include <grp.h>
-#include <limits.h>
-#include <paths.h>
-#include <pthread.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <inttypes.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 <urcu/uatomic.h>
-#include <unistd.h>
-#include <ctype.h>
-
-#include <common/common.h>
-#include <common/compat/socket.h>
-#include <common/compat/getenv.h>
-#include <common/defaults.h>
-#include <common/kernel-consumer/kernel-consumer.h>
-#include <common/futex.h>
-#include <common/relayd/relayd.h>
-#include <common/utils.h>
-#include <common/daemonize.h>
-#include <common/config/session-config.h>
-#include <common/dynamic-buffer.h>
-#include <lttng/event-internal.h>
-
-#include "lttng-sessiond.h"
-#include "buffer-registry.h"
-#include "channel.h"
-#include "cmd.h"
-#include "consumer.h"
-#include "context.h"
-#include "event.h"
-#include "event-notifier-error-accounting.h"
-#include "kernel.h"
-#include "kernel-consumer.h"
-#include "lttng-ust-ctl.h"
-#include "ust-consumer.h"
-#include "utils.h"
-#include "fd-limit.h"
-#include "health-sessiond.h"
-#include "testpoint.h"
-#include "notify-apps.h"
-#include "agent-thread.h"
-#include "save.h"
-#include "notification-thread.h"
-#include "notification-thread-commands.h"
-#include "rotation-thread.h"
-#include "agent.h"
-#include "ht-cleanup.h"
-#include "sessiond-config.h"
-#include "timer.h"
-#include "thread.h"
-#include "client.h"
-#include "dispatch.h"
-#include "register.h"
-#include "manage-apps.h"
-#include "manage-kernel.h"
-#include "modprobe.h"
-#include "ust-sigbus.h"
-
-static const char *help_msg =
-#ifdef LTTNG_EMBED_HELP
-#include <lttng-sessiond.8.h>
-#else
-NULL
-#endif
-;
-
-#define EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX 65535
-#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR \
- "event-notifier-error-buffer-size"
-#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR \
- EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-kernel"
-#define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR \
- EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-userspace"
-
-
-const char *progname;
-static int lockfile_fd = -1;
-static int opt_print_version;
-
-/* Set to 1 when a SIGUSR1 signal is received. */
-static int recv_child_signal;
-
-/* Command line options */
-static const struct option long_options[] = {
- { "client-sock", required_argument, 0, 'c' },
- { "apps-sock", required_argument, 0, 'a' },
- { "kconsumerd-cmd-sock", required_argument, 0, '\0' },
- { "kconsumerd-err-sock", required_argument, 0, '\0' },
- { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' },
- { "ustconsumerd32-err-sock", required_argument, 0, '\0' },
- { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' },
- { "ustconsumerd64-err-sock", required_argument, 0, '\0' },
- { "consumerd32-path", required_argument, 0, '\0' },
- { "consumerd32-libdir", required_argument, 0, '\0' },
- { "consumerd64-path", required_argument, 0, '\0' },
- { "consumerd64-libdir", required_argument, 0, '\0' },
- { "daemonize", no_argument, 0, 'd' },
- { "background", no_argument, 0, 'b' },
- { "sig-parent", no_argument, 0, 'S' },
- { "help", no_argument, 0, 'h' },
- { "group", required_argument, 0, 'g' },
- { "version", no_argument, 0, 'V' },
- { "quiet", no_argument, 0, 'q' },
- { "verbose", no_argument, 0, 'v' },
- { "verbose-consumer", no_argument, 0, '\0' },
- { "no-kernel", no_argument, 0, '\0' },
- { "pidfile", required_argument, 0, 'p' },
- { "agent-tcp-port", required_argument, 0, '\0' },
- { "config", required_argument, 0, 'f' },
- { "load", required_argument, 0, 'l' },
- { "kmod-probes", required_argument, 0, '\0' },
- { "extra-kmod-probes", required_argument, 0, '\0' },
- { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, required_argument, 0, '\0' },
- { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, required_argument, 0, '\0' },
- { NULL, 0, 0, 0 }
-};
-
-/* Command line options to ignore from configuration file */
-static const char *config_ignore_options[] = { "help", "version", "config" };
-
-/*
- * This pipe is used to inform the thread managing application communication
- * that a command is queued and ready to be processed.
- */
-static int apps_cmd_pipe[2] = { -1, -1 };
-static int apps_cmd_notify_pipe[2] = { -1, -1 };
-
-/*
- * UST registration command queue. This queue is tied with a futex and uses a N
- * wakers / 1 waiter implemented and detailed in futex.c/.h
- *
- * The thread_registration_apps and thread_dispatch_ust_registration uses this
- * queue along with the wait/wake scheme. The thread_manage_apps receives down
- * the line new application socket and monitors it for any I/O error or clean
- * close that triggers an unregistration of the application.
- */
-static struct ust_cmd_queue ust_cmd_queue;
-
-/*
- * Section name to look for in the daemon configuration file.
- */
-static const char * const config_section_name = "sessiond";
-
-/* Am I root or not. Set to 1 if the daemon is running as root */
-static int is_root;
-
-/*
- * Stop all threads by closing the thread quit pipe.
- */
-static void stop_threads(void)
-{
- int ret;
-
- /* Stopping all threads */
- DBG("Terminating all threads");
- ret = sessiond_notify_quit_pipe();
- if (ret < 0) {
- ERR("write error on thread quit pipe");
- }
-}
-
-/*
- * Close every consumer sockets.
- */
-static void close_consumer_sockets(void)
-{
- int ret;
-
- if (the_kconsumer_data.err_sock >= 0) {
- ret = close(the_kconsumer_data.err_sock);
- if (ret < 0) {
- PERROR("kernel consumer err_sock close");
- }
- }
- if (the_ustconsumer32_data.err_sock >= 0) {
- ret = close(the_ustconsumer32_data.err_sock);
- if (ret < 0) {
- PERROR("UST consumerd32 err_sock close");
- }
- }
- if (the_ustconsumer64_data.err_sock >= 0) {
- ret = close(the_ustconsumer64_data.err_sock);
- if (ret < 0) {
- PERROR("UST consumerd64 err_sock close");
- }
- }
- if (the_kconsumer_data.cmd_sock >= 0) {
- ret = close(the_kconsumer_data.cmd_sock);
- if (ret < 0) {
- PERROR("kernel consumer cmd_sock close");
- }
- }
- if (the_ustconsumer32_data.cmd_sock >= 0) {
- ret = close(the_ustconsumer32_data.cmd_sock);
- if (ret < 0) {
- PERROR("UST consumerd32 cmd_sock close");
- }
- }
- if (the_ustconsumer64_data.cmd_sock >= 0) {
- ret = close(the_ustconsumer64_data.cmd_sock);
- if (ret < 0) {
- PERROR("UST consumerd64 cmd_sock close");
- }
- }
- if (the_kconsumer_data.channel_monitor_pipe >= 0) {
- ret = close(the_kconsumer_data.channel_monitor_pipe);
- if (ret < 0) {
- PERROR("kernel consumer channel monitor pipe close");
- }
- }
- if (the_ustconsumer32_data.channel_monitor_pipe >= 0) {
- ret = close(the_ustconsumer32_data.channel_monitor_pipe);
- if (ret < 0) {
- PERROR("UST consumerd32 channel monitor pipe close");
- }
- }
- if (the_ustconsumer64_data.channel_monitor_pipe >= 0) {
- ret = close(the_ustconsumer64_data.channel_monitor_pipe);
- if (ret < 0) {
- PERROR("UST consumerd64 channel monitor pipe close");
- }
- }
-}
-
-/*
- * Wait on consumer process termination.
- *
- * Need to be called with the consumer data lock held or from a context
- * ensuring no concurrent access to data (e.g: cleanup).
- */
-static void wait_consumer(struct consumer_data *consumer_data)
-{
- pid_t ret;
- int status;
-
- if (consumer_data->pid <= 0) {
- return;
- }
-
- DBG("Waiting for complete teardown of consumerd (PID: %d)",
- consumer_data->pid);
- ret = waitpid(consumer_data->pid, &status, 0);
- if (ret == -1) {
- PERROR("consumerd waitpid pid: %d", consumer_data->pid)
- } else if (!WIFEXITED(status)) {
- ERR("consumerd termination with error: %d",
- WEXITSTATUS(ret));
- }
- consumer_data->pid = 0;
-}
-
-/*
- * Cleanup the session daemon's data structures.
- */
-static void sessiond_cleanup(void)
-{
- int ret;
- struct ltt_session_list *session_list = session_get_list();
-
- DBG("Cleanup sessiond");
-
- /*
- * Close the thread quit pipe. It has already done its job,
- * since we are now called.
- */
- sessiond_close_quit_pipe();
- utils_close_pipe(apps_cmd_pipe);
- utils_close_pipe(apps_cmd_notify_pipe);
- utils_close_pipe(the_kernel_poll_pipe);
-
- ret = remove(the_config.pid_file_path.value);
- if (ret < 0) {
- PERROR("remove pidfile %s", the_config.pid_file_path.value);
- }
-
- DBG("Removing sessiond and consumerd content of directory %s",
- the_config.rundir.value);
-
- /* sessiond */
- DBG("Removing %s", the_config.pid_file_path.value);
- (void) unlink(the_config.pid_file_path.value);
-
- DBG("Removing %s", the_config.agent_port_file_path.value);
- (void) unlink(the_config.agent_port_file_path.value);
-
- /* kconsumerd */
- DBG("Removing %s", the_kconsumer_data.err_unix_sock_path);
- (void) unlink(the_kconsumer_data.err_unix_sock_path);
-
- DBG("Removing directory %s", the_config.kconsumerd_path.value);
- (void) rmdir(the_config.kconsumerd_path.value);
-
- /* ust consumerd 32 */
- DBG("Removing %s", the_config.consumerd32_err_unix_sock_path.value);
- (void) unlink(the_config.consumerd32_err_unix_sock_path.value);
-
- DBG("Removing directory %s", the_config.consumerd32_path.value);
- (void) rmdir(the_config.consumerd32_path.value);
-
- /* ust consumerd 64 */
- DBG("Removing %s", the_config.consumerd64_err_unix_sock_path.value);
- (void) unlink(the_config.consumerd64_err_unix_sock_path.value);
-
- DBG("Removing directory %s", the_config.consumerd64_path.value);
- (void) rmdir(the_config.consumerd64_path.value);
-
- pthread_mutex_destroy(&session_list->lock);
-
- DBG("Cleaning up all per-event notifier domain agents");
- agent_by_event_notifier_domain_ht_destroy();
-
- DBG("Cleaning up all agent apps");
- agent_app_ht_clean();
- DBG("Closing all UST sockets");
- ust_app_clean_list();
- buffer_reg_destroy_registries();
-
- close_consumer_sockets();
-
- wait_consumer(&the_kconsumer_data);
- wait_consumer(&the_ustconsumer64_data);
- wait_consumer(&the_ustconsumer32_data);
-
- if (is_root && !the_config.no_kernel) {
- cleanup_kernel_tracer();
- }
-
- /*
- * We do NOT rmdir rundir because there are other processes
- * using it, for instance lttng-relayd, which can start in
- * parallel with this teardown.
- */
-}
-
-/*
- * Cleanup the daemon's option data structures.
- */
-static void sessiond_cleanup_options(void)
-{
- DBG("Cleaning up options");
-
- sessiond_config_fini(&the_config);
-
- run_as_destroy_worker();
-}
-
-static int string_match(const char *str1, const char *str2)
-{
- return (str1 && str2) && !strcmp(str1, str2);
-}
-
-/*
- * 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 = 0;
-
- if (string_match(optname, "client-sock") || opt == 'c') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-c, --client-sock");
- } else {
- config_string_set(&the_config.client_unix_sock_path,
- strdup(arg));
- if (!the_config.client_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "apps-sock") || opt == 'a') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-a, --apps-sock");
- } else {
- config_string_set(&the_config.apps_unix_sock_path,
- strdup(arg));
- if (!the_config.apps_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "daemonize") || opt == 'd') {
- the_config.daemonize = true;
- } else if (string_match(optname, "background") || opt == 'b') {
- the_config.background = true;
- } else if (string_match(optname, "group") || opt == 'g') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-g, --group");
- } else {
- config_string_set(&the_config.tracing_group_name,
- strdup(arg));
- if (!the_config.tracing_group_name.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "help") || opt == 'h') {
- ret = utils_show_help(8, "lttng-sessiond", help_msg);
- if (ret) {
- ERR("Cannot show --help for `lttng-sessiond`");
- perror("exec");
- }
- exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
- } else if (string_match(optname, "version") || opt == 'V') {
- opt_print_version = 1;
- } else if (string_match(optname, "sig-parent") || opt == 'S') {
- the_config.sig_parent = true;
- } else if (string_match(optname, "kconsumerd-err-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--kconsumerd-err-sock");
- } else {
- config_string_set(
- &the_config.kconsumerd_err_unix_sock_path,
- strdup(arg));
- if (!the_config.kconsumerd_err_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "kconsumerd-cmd-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--kconsumerd-cmd-sock");
- } else {
- config_string_set(
- &the_config.kconsumerd_cmd_unix_sock_path,
- strdup(arg));
- if (!the_config.kconsumerd_cmd_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd64-err-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd64-err-sock");
- } else {
- config_string_set(
- &the_config.consumerd64_err_unix_sock_path,
- strdup(arg));
- if (!the_config.consumerd64_err_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd64-cmd-sock");
- } else {
- config_string_set(
- &the_config.consumerd64_cmd_unix_sock_path,
- strdup(arg));
- if (!the_config.consumerd64_cmd_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd32-err-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd32-err-sock");
- } else {
- config_string_set(
- &the_config.consumerd32_err_unix_sock_path,
- strdup(arg));
- if (!the_config.consumerd32_err_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--ustconsumerd32-cmd-sock");
- } else {
- config_string_set(
- &the_config.consumerd32_cmd_unix_sock_path,
- strdup(arg));
- if (!the_config.consumerd32_cmd_unix_sock_path.value) {
- ret = -ENOMEM;
- PERROR("strdup");
- }
- }
- } else if (string_match(optname, "no-kernel")) {
- the_config.no_kernel = true;
- } else if (string_match(optname, "quiet") || opt == 'q') {
- the_config.quiet = true;
- } else if (string_match(optname, "verbose") || opt == 'v') {
- /* Verbose level can increase using multiple -v */
- if (arg) {
- /* Value obtained from config file */
- the_config.verbose = config_parse_value(arg);
- } else {
- /* -v used on command line */
- the_config.verbose++;
- }
- /* Clamp value to [0, 3] */
- the_config.verbose = the_config.verbose < 0 ?
- 0 :
- (the_config.verbose <= 3 ? the_config.verbose :
- 3);
- } else if (string_match(optname, "verbose-consumer")) {
- if (arg) {
- the_config.verbose_consumer = config_parse_value(arg);
- } else {
- the_config.verbose_consumer++;
- }
- } else if (string_match(optname, "consumerd32-path")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd32-path");
- } else {
- config_string_set(&the_config.consumerd32_bin_path,
- strdup(arg));
- if (!the_config.consumerd32_bin_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "consumerd32-libdir")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd32-libdir");
- } else {
- config_string_set(&the_config.consumerd32_lib_dir,
- strdup(arg));
- if (!the_config.consumerd32_lib_dir.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "consumerd64-path")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd64-path");
- } else {
- config_string_set(&the_config.consumerd64_bin_path,
- strdup(arg));
- if (!the_config.consumerd64_bin_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "consumerd64-libdir")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--consumerd64-libdir");
- } else {
- config_string_set(&the_config.consumerd64_lib_dir,
- strdup(arg));
- if (!the_config.consumerd64_lib_dir.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "pidfile") || opt == 'p') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-p, --pidfile");
- } else {
- config_string_set(
- &the_config.pid_file_path, strdup(arg));
- if (!the_config.pid_file_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "agent-tcp-port")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--agent-tcp-port");
- } else {
- unsigned long v;
-
- errno = 0;
- v = strtoul(arg, NULL, 0);
- if (errno != 0 || !isdigit(arg[0])) {
- ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
- return -1;
- }
- if (v == 0 || v >= 65535) {
- ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
- return -1;
- }
- the_config.agent_tcp_port.begin =
- the_config.agent_tcp_port.end = (int) v;
- DBG3("Agent TCP port set to non default: %i", (int) v);
- }
- } else if (string_match(optname, "load") || opt == 'l') {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "-l, --load");
- } else {
- config_string_set(&the_config.load_session_path,
- strdup(arg));
- if (!the_config.load_session_path.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "kmod-probes")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--kmod-probes");
- } else {
- config_string_set(&the_config.kmod_probes_list,
- strdup(arg));
- if (!the_config.kmod_probes_list.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, "extra-kmod-probes")) {
- if (!arg || *arg == '\0') {
- ret = -EINVAL;
- goto end;
- }
- if (lttng_is_setuid_setgid()) {
- WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
- "--extra-kmod-probes");
- } else {
- config_string_set(&the_config.kmod_extra_probes_list,
- strdup(arg));
- if (!the_config.kmod_extra_probes_list.value) {
- PERROR("strdup");
- ret = -ENOMEM;
- }
- }
- } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR)) {
- unsigned long v;
-
- errno = 0;
- v = strtoul(arg, NULL, 0);
- if (errno != 0 || !isdigit(arg[0])) {
- ERR("Wrong value in --%s parameter: %s",
- EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, arg);
- return -1;
- }
- if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
- ERR("Value out of range for --%s parameter: %s",
- EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, arg);
- return -1;
- }
- the_config.event_notifier_buffer_size_kernel = (int) v;
- DBG3("Number of event notifier error buffer kernel size to non default: %i",
- the_config.event_notifier_buffer_size_kernel);
- goto end;
- } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR)) {
- unsigned long v;
-
- errno = 0;
- v = strtoul(arg, NULL, 0);
- if (errno != 0 || !isdigit(arg[0])) {
- ERR("Wrong value in --%s parameter: %s",
- EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, arg);
- return -1;
- }
- if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
- ERR("Value out of range for --%s parameter: %s",
- EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, arg);
- return -1;
- }
- the_config.event_notifier_buffer_size_userspace = (int) v;
- DBG3("Number of event notifier error buffer userspace size to non default: %i",
- the_config.event_notifier_buffer_size_userspace);
- goto end;
- } else if (string_match(optname, "config") || opt == 'f') {
- /* This is handled in set_options() thus silent skip. */
- goto end;
- } else {
- /* Unknown option or other error.
- * Error is printed by getopt, just return */
- ret = -1;
- }
-
-end:
- if (ret == -EINVAL) {
- const char *opt_name = "unknown";
- int i;
-
- for (i = 0; i < sizeof(long_options) / sizeof(struct option);
- i++) {
- if (opt == long_options[i].val) {
- opt_name = long_options[i].name;
- break;
- }
- }
-
- WARN("Invalid argument provided for option \"%s\", using default value.",
- opt_name);
- }
-
- 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 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 void print_version(void) {
- fprintf(stdout, "%s\n", VERSION);
-}
-
-/*
- * daemon configuration loading and argument parsing
- */
-static int set_options(int argc, char **argv)
-{
- int ret = 0, c = 0, option_index = 0;
- int orig_optopt = optopt, orig_optind = optind;
- char *optstring;
- char *config_path = NULL;
-
- optstring = utils_generate_optstring(long_options,
- sizeof(long_options) / sizeof(struct option));
- if (!optstring) {
- ret = -ENOMEM;
- goto end;
- }
-
- /* Check for the --config option */
- while ((c = getopt_long(argc, argv, optstring, long_options,
- &option_index)) != -1) {
- if (c == '?') {
- ret = -EINVAL;
- goto end;
- } else if (c != 'f') {
- /* if not equal to --config option. */
- 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);
- ret = -1;
- }
- goto end;
- }
-
- /* Reset getopt's global state */
- optopt = orig_optopt;
- optind = orig_optind;
- while (1) {
- option_index = -1;
- /*
- * getopt_long() will not set option_index if it encounters a
- * short option.
- */
- c = getopt_long(argc, argv, optstring, long_options,
- &option_index);
- if (c == -1) {
- break;
- }
-
- /*
- * Pass NULL as the long option name if popt left the index
- * unset.
- */
- ret = set_option(c, optarg,
- option_index < 0 ? NULL :
- long_options[option_index].name);
- if (ret < 0) {
- break;
- }
- }
-
-end:
- free(config_path);
- free(optstring);
- return ret;
-}
-
-/*
- * Create lockfile using the rundir and return its fd.
- */
-static int create_lockfile(void)
-{
- return utils_create_lock_file(the_config.lock_file_path.value);
-}
-
-/*
- * Check if the global socket is available, and if a daemon is answering at the
- * other side. If yes, error is returned.
- *
- * Also attempts to create and hold the lock file.
- */
-static int check_existing_daemon(void)
-{
- int ret = 0;
-
- /* Is there anybody out there ? */
- if (lttng_session_daemon_alive()) {
- ret = -EEXIST;
- goto end;
- }
-
- lockfile_fd = create_lockfile();
- if (lockfile_fd < 0) {
- ret = -EEXIST;
- goto end;
- }
-end:
- return ret;
-}
-
-static void sessiond_cleanup_lock_file(void)
-{
- int ret;
-
- /*
- * Cleanup lock file by deleting it and finaly closing it which will
- * release the file system lock.
- */
- if (lockfile_fd >= 0) {
- ret = remove(the_config.lock_file_path.value);
- if (ret < 0) {
- PERROR("remove lock file");
- }
- ret = close(lockfile_fd);
- if (ret < 0) {
- PERROR("close lock file");
- }
- }
-}
-
-/*
- * Set the tracing group gid onto the client socket.
- *
- * Race window between mkdir and chown is OK because we are going from more
- * permissive (root.root) to less permissive (root.tracing).
- */
-static int set_permissions(char *rundir)
-{
- int ret;
- gid_t gid;
-
- ret = utils_get_group_id(
- the_config.tracing_group_name.value, true, &gid);
- if (ret) {
- /* Default to root group. */
- gid = 0;
- }
-
- /* Set lttng run dir */
- ret = chown(rundir, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", rundir);
- PERROR("chown");
- }
-
- /*
- * Ensure all applications and tracing group can search the run
- * dir. Allow everyone to read the directory, since it does not
- * buy us anything to hide its content.
- */
- ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
- if (ret < 0) {
- ERR("Unable to set permissions on %s", rundir);
- PERROR("chmod");
- }
-
- /* lttng client socket path */
- ret = chown(the_config.client_unix_sock_path.value, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s",
- the_config.client_unix_sock_path.value);
- PERROR("chown");
- }
-
- /* kconsumer error socket path */
- ret = chown(the_kconsumer_data.err_unix_sock_path, 0, 0);
- if (ret < 0) {
- ERR("Unable to set group on %s",
- the_kconsumer_data.err_unix_sock_path);
- PERROR("chown");
- }
-
- /* 64-bit ustconsumer error socket path */
- ret = chown(the_ustconsumer64_data.err_unix_sock_path, 0, 0);
- if (ret < 0) {
- ERR("Unable to set group on %s",
- the_ustconsumer64_data.err_unix_sock_path);
- PERROR("chown");
- }
-
- /* 32-bit ustconsumer compat32 error socket path */
- ret = chown(the_ustconsumer32_data.err_unix_sock_path, 0, 0);
- if (ret < 0) {
- ERR("Unable to set group on %s",
- the_ustconsumer32_data.err_unix_sock_path);
- PERROR("chown");
- }
-
- DBG("All permissions are set");
-
- return ret;
-}
-
-/*
- * Create the lttng run directory needed for all global sockets and pipe.
- */
-static int create_lttng_rundir(void)
-{
- int ret;
-
- DBG3("Creating LTTng run directory: %s", the_config.rundir.value);
-
- ret = mkdir(the_config.rundir.value, S_IRWXU);
- if (ret < 0) {
- if (errno != EEXIST) {
- ERR("Unable to create %s", the_config.rundir.value);
- goto error;
- } else {
- ret = 0;
- }
- }
-
-error:
- return ret;
-}
-
-/*
- * Setup sockets and directory needed by the consumerds' communication with the
- * session daemon.
- */
-static int set_consumer_sockets(struct consumer_data *consumer_data)
-{
- int ret;
- char *path = NULL;
-
- switch (consumer_data->type) {
- case LTTNG_CONSUMER_KERNEL:
- path = the_config.kconsumerd_path.value;
- break;
- case LTTNG_CONSUMER64_UST:
- path = the_config.consumerd64_path.value;
- break;
- case LTTNG_CONSUMER32_UST:
- path = the_config.consumerd32_path.value;
- break;
- default:
- ERR("Consumer type unknown");
- ret = -EINVAL;
- goto error;
- }
- LTTNG_ASSERT(path);
-
- DBG2("Creating consumer directory: %s", path);
-
- ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
- if (ret < 0 && errno != EEXIST) {
- PERROR("mkdir");
- ERR("Failed to create %s", path);
- goto error;
- }
- if (is_root) {
- gid_t gid;
-
- ret = utils_get_group_id(the_config.tracing_group_name.value,
- true, &gid);
- if (ret) {
- /* Default to root group. */
- gid = 0;
- }
-
- ret = chown(path, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", path);
- PERROR("chown");
- goto error;
- }
- }
-
- /* Create the consumerd error unix socket */
- consumer_data->err_sock =
- lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
- if (consumer_data->err_sock < 0) {
- ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
- ret = -1;
- goto error;
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- ret = utils_set_fd_cloexec(consumer_data->err_sock);
- if (ret < 0) {
- PERROR("utils_set_fd_cloexec");
- /* continue anyway */
- }
-
- /* File permission MUST be 660 */
- ret = chmod(consumer_data->err_unix_sock_path,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
- PERROR("chmod");
- goto error;
- }
-
-error:
- return ret;
-}
-
-/*
- * 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, siginfo_t *siginfo, void *arg)
-{
- switch (sig) {
- case SIGINT:
- DBG("SIGINT caught");
- stop_threads();
- break;
- case SIGTERM:
- DBG("SIGTERM caught");
- stop_threads();
- break;
- case SIGUSR1:
- CMM_STORE_SHARED(recv_child_signal, 1);
- break;
- case SIGBUS:
- {
- int write_ret;
- const char msg[] = "Received SIGBUS, aborting program.\n";
-
- lttng_ust_handle_sigbus(siginfo->si_addr);
- /*
- * If ustctl did not catch this signal (triggering a
- * siglongjmp), abort the program. Otherwise, the execution
- * will resume from the ust-ctl call which caused this error.
- *
- * The return value is ignored since the program aborts anyhow.
- */
- write_ret = write(STDERR_FILENO, msg, sizeof(msg));
- (void) write_ret;
- abort();
- }
- 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 = SA_SIGINFO;
-
- sa.sa_sigaction = 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;
- }
-
- if ((ret = sigaction(SIGBUS, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- sa.sa_flags = 0;
- sa.sa_handler = SIG_IGN;
- if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
- PERROR("sigaction");
- return ret;
- }
-
- DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE, SIGINT, and SIGBUS");
-
- return ret;
-}
-
-/*
- * Set open files limit to unlimited. This daemon can open a large number of
- * file descriptors in order to consume multiple kernel traces.
- */
-static void set_ulimit(void)
-{
- int ret;
- struct rlimit lim;
-
- /* The kernel does not allow an infinite limit for open files */
- lim.rlim_cur = 65535;
- lim.rlim_max = 65535;
-
- ret = setrlimit(RLIMIT_NOFILE, &lim);
- if (ret < 0) {
- PERROR("failed to set open files limit");
- }
-}
-
-static int write_pidfile(void)
-{
- return utils_create_pid_file(getpid(), the_config.pid_file_path.value);
-}
-
-static int set_clock_plugin_env(void)
-{
- int ret = 0;
- char *env_value = NULL;
-
- if (!the_config.lttng_ust_clock_plugin.value) {
- goto end;
- }
-
- ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
- the_config.lttng_ust_clock_plugin.value);
- if (ret < 0) {
- PERROR("asprintf");
- goto end;
- }
-
- ret = putenv(env_value);
- if (ret) {
- free(env_value);
- PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
- goto end;
- }
-
- DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
- the_config.lttng_ust_clock_plugin.value);
-end:
- return ret;
-}
-
-static void destroy_all_sessions_and_wait(void)
-{
- struct ltt_session *session, *tmp;
- struct ltt_session_list *session_list;
-
- session_list = session_get_list();
- DBG("Initiating destruction of all sessions");
-
- if (!session_list) {
- return;
- }
-
- session_lock_list();
- /* Initiate the destruction of all sessions. */
- cds_list_for_each_entry_safe(session, tmp,
- &session_list->head, list) {
- if (!session_get(session)) {
- continue;
- }
-
- session_lock(session);
- if (session->destroyed) {
- goto unlock_session;
- }
- (void) cmd_stop_trace(session);
- (void) cmd_destroy_session(
- session, the_notification_thread_handle, NULL);
- unlock_session:
- session_unlock(session);
- session_put(session);
- }
- session_unlock_list();
-
- /* Wait for the destruction of all sessions to complete. */
- DBG("Waiting for the destruction of all sessions to complete");
- session_list_wait_empty();
- DBG("Destruction of all sessions completed");
-}
-
-static void unregister_all_triggers(void)
-{
- enum lttng_error_code ret_code;
- enum lttng_trigger_status trigger_status;
- struct lttng_triggers *triggers = NULL;
- unsigned int trigger_count, i;
- const struct lttng_credentials creds = {
- .uid = LTTNG_OPTIONAL_INIT_VALUE(0),
- };
-
- DBG("Unregistering all triggers");
-
- /*
- * List all triggers as "root" since we wish to unregister all triggers.
- */
- ret_code = notification_thread_command_list_triggers(
- the_notification_thread_handle, creds.uid.value,
- &triggers);
- if (ret_code != LTTNG_OK) {
- ERR("Failed to list triggers while unregistering all triggers");
- goto end;
- }
-
- trigger_status = lttng_triggers_get_count(triggers, &trigger_count);
- LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK);
-
- for (i = 0; i < trigger_count; i++) {
- uid_t trigger_owner;
- const char *trigger_name;
- const struct lttng_trigger *trigger =
- lttng_triggers_get_at_index(triggers, i);
-
- LTTNG_ASSERT(trigger);
-
- trigger_status = lttng_trigger_get_owner_uid(
- trigger, &trigger_owner);
- LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK);
-
- trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
- trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ?
- trigger_name : "(anonymous)";
-
- DBG("Unregistering trigger: trigger owner uid = %d, trigger name = '%s'",
- (int) trigger_owner, trigger_name);
-
- ret_code = cmd_unregister_trigger(&creds, trigger,
- the_notification_thread_handle);
- if (ret_code != LTTNG_OK) {
- ERR("Failed to unregister trigger: trigger owner uid = %d, trigger name = '%s', error: '%s'",
- (int) trigger_owner, trigger_name,
- lttng_strerror(-ret_code));
- /* Continue to unregister the remaining triggers. */
- }
- }
-end:
- lttng_triggers_destroy(triggers);
-}
-
-static int run_as_worker_post_fork_cleanup(void *data)
-{
- struct sessiond_config *sessiond_config = data;
-
- sessiond_config_fini(sessiond_config);
- return 0;
-}
-
-static int launch_run_as_worker(const char *procname)
-{
- /*
- * Clean-up before forking the run-as worker. Any dynamically
- * allocated memory of which the worker is not aware will
- * be leaked as the process forks a run-as worker (and performs
- * no exec*()). The same would apply to any opened fd.
- */
- return run_as_create_worker(
- procname, run_as_worker_post_fork_cleanup, &the_config);
-}
-
-static void sessiond_uuid_log(void)
-{
- char uuid_str[LTTNG_UUID_STR_LEN];
-
- lttng_uuid_to_str(the_sessiond_uuid, uuid_str);
- DBG("Starting lttng-sessiond {%s}", uuid_str);
-}
-
-/*
- * main
- */
-int main(int argc, char **argv)
-{
- int ret = 0, retval = 0;
- const char *env_app_timeout;
- struct lttng_pipe *ust32_channel_monitor_pipe = NULL,
- *ust64_channel_monitor_pipe = NULL,
- *kernel_channel_monitor_pipe = NULL;
- struct lttng_thread *ht_cleanup_thread = NULL;
- struct timer_thread_parameters timer_thread_parameters;
- /* Rotation thread handle. */
- struct rotation_thread_handle *rotation_thread_handle = NULL;
- /* Queue of rotation jobs populated by the sessiond-timer. */
- struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
- struct lttng_thread *client_thread = NULL;
- struct lttng_thread *notification_thread = NULL;
- struct lttng_thread *register_apps_thread = NULL;
- enum event_notifier_error_accounting_status event_notifier_error_accounting_status;
-
- logger_set_thread_name("Main", false);
- init_kernel_workarounds();
-
- rcu_register_thread();
-
- if (set_signal_handler()) {
- retval = -1;
- goto exit_set_signal_handler;
- }
-
- if (timer_signal_init()) {
- retval = -1;
- goto exit_set_signal_handler;
- }
-
- the_page_size = sysconf(_SC_PAGE_SIZE);
- if (the_page_size < 0) {
- PERROR("sysconf _SC_PAGE_SIZE");
- the_page_size = LONG_MAX;
- WARN("Fallback page size to %ld", the_page_size);
- }
-
- ret = sessiond_config_init(&the_config);
- if (ret) {
- retval = -1;
- goto exit_set_signal_handler;
- }
-
- /*
- * Init config from environment variables.
- * Command line option override env configuration per-doc. Do env first.
- */
- sessiond_config_apply_env_config(&the_config);
-
- /*
- * Parse arguments and load the daemon configuration file.
- *
- * We have an exit_options exit path to free memory reserved by
- * set_options. This is needed because the rest of sessiond_cleanup()
- * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
- * depends on set_options.
- */
- progname = argv[0];
- if (set_options(argc, argv)) {
- retval = -1;
- goto exit_options;
- }
-
- /*
- * Resolve all paths received as arguments, configuration option, or
- * through environment variable as absolute paths. This is necessary
- * since daemonizing causes the sessiond's current working directory
- * to '/'.
- */
- ret = sessiond_config_resolve_paths(&the_config);
- if (ret) {
- goto exit_options;
- }
-
- /* Apply config. */
- lttng_opt_verbose = the_config.verbose;
- lttng_opt_quiet = the_config.quiet;
- the_kconsumer_data.err_unix_sock_path =
- the_config.kconsumerd_err_unix_sock_path.value;
- the_kconsumer_data.cmd_unix_sock_path =
- the_config.kconsumerd_cmd_unix_sock_path.value;
- the_ustconsumer32_data.err_unix_sock_path =
- the_config.consumerd32_err_unix_sock_path.value;
- the_ustconsumer32_data.cmd_unix_sock_path =
- the_config.consumerd32_cmd_unix_sock_path.value;
- the_ustconsumer64_data.err_unix_sock_path =
- the_config.consumerd64_err_unix_sock_path.value;
- the_ustconsumer64_data.cmd_unix_sock_path =
- the_config.consumerd64_cmd_unix_sock_path.value;
- set_clock_plugin_env();
-
- sessiond_config_log(&the_config);
- sessiond_uuid_log();
-
- if (opt_print_version) {
- print_version();
- retval = 0;
- goto exit_options;
- }
-
- if (create_lttng_rundir()) {
- retval = -1;
- goto exit_options;
- }
-
- /* Abort launch if a session daemon is already running. */
- if (check_existing_daemon()) {
- ERR("A session daemon is already running.");
- retval = -1;
- goto exit_options;
- }
-
- /* Daemonize */
- if (the_config.daemonize || the_config.background) {
- int i;
-
- ret = lttng_daemonize(&the_child_ppid, &recv_child_signal,
- !the_config.background);
- if (ret < 0) {
- retval = -1;
- goto exit_options;
- }
-
- /*
- * We are in the child. Make sure all other file descriptors are
- * closed, in case we are called with more opened file
- * descriptors than the standard ones and the lock file.
- */
- for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
- if (i == lockfile_fd) {
- continue;
- }
- (void) close(i);
- }
- }
-
- if (launch_run_as_worker(argv[0]) < 0) {
- goto exit_create_run_as_worker_cleanup;
- }
-
- /*
- * Starting from here, we can create threads. This needs to be after
- * lttng_daemonize due to RCU.
- */
-
- /*
- * Initialize the health check subsystem. This call should set the
- * appropriate time values.
- */
- the_health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
- if (!the_health_sessiond) {
- PERROR("health_app_create error");
- retval = -1;
- goto stop_threads;
- }
-
- /* Create thread to clean up RCU hash tables */
- ht_cleanup_thread = launch_ht_cleanup_thread();
- if (!ht_cleanup_thread) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create thread quit pipe */
- if (sessiond_init_thread_quit_pipe()) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Check if daemon is UID = 0 */
- is_root = !getuid();
- if (is_root) {
- /* Create global run dir with root access */
-
- kernel_channel_monitor_pipe = lttng_pipe_open(0);
- if (!kernel_channel_monitor_pipe) {
- ERR("Failed to create kernel consumer channel monitor pipe");
- retval = -1;
- goto stop_threads;
- }
- the_kconsumer_data.channel_monitor_pipe =
- lttng_pipe_release_writefd(
- kernel_channel_monitor_pipe);
- if (the_kconsumer_data.channel_monitor_pipe < 0) {
- retval = -1;
- goto stop_threads;
- }
- }
-
- /* Set consumer initial state */
- the_kernel_consumerd_state = CONSUMER_STOPPED;
- the_ust_consumerd_state = CONSUMER_STOPPED;
-
- ust32_channel_monitor_pipe = lttng_pipe_open(0);
- if (!ust32_channel_monitor_pipe) {
- ERR("Failed to create 32-bit user space consumer channel monitor pipe");
- retval = -1;
- goto stop_threads;
- }
- the_ustconsumer32_data.channel_monitor_pipe =
- lttng_pipe_release_writefd(ust32_channel_monitor_pipe);
- if (the_ustconsumer32_data.channel_monitor_pipe < 0) {
- retval = -1;
- goto stop_threads;
- }
-
- /*
- * The rotation_thread_timer_queue structure is shared between the
- * sessiond timer thread and the rotation thread. The main thread keeps
- * its ownership and destroys it when both threads have been joined.
- */
- rotation_timer_queue = rotation_thread_timer_queue_create();
- if (!rotation_timer_queue) {
- retval = -1;
- goto stop_threads;
- }
- timer_thread_parameters.rotation_thread_job_queue =
- rotation_timer_queue;
-
- ust64_channel_monitor_pipe = lttng_pipe_open(0);
- if (!ust64_channel_monitor_pipe) {
- ERR("Failed to create 64-bit user space consumer channel monitor pipe");
- retval = -1;
- goto stop_threads;
- }
- the_ustconsumer64_data.channel_monitor_pipe =
- lttng_pipe_release_writefd(ust64_channel_monitor_pipe);
- if (the_ustconsumer64_data.channel_monitor_pipe < 0) {
- retval = -1;
- goto stop_threads;
- }
-
- /*
- * Init UST app hash table. Alloc hash table before this point since
- * cleanup() can get called after that point.
- */
- if (ust_app_ht_alloc()) {
- ERR("Failed to allocate UST app hash table");
- retval = -1;
- goto stop_threads;
- }
-
- event_notifier_error_accounting_status = event_notifier_error_accounting_init(
- the_config.event_notifier_buffer_size_kernel,
- the_config.event_notifier_buffer_size_userspace);
- if (event_notifier_error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
- ERR("Failed to initialize event notifier error accounting system");
- retval = -1;
- goto stop_threads;
- }
-
- /*
- * Initialize agent app hash table. We allocate the hash table here
- * since cleanup() can get called after this point.
- */
- if (agent_app_ht_alloc()) {
- ERR("Failed to allocate Agent app hash table");
- retval = -1;
- goto stop_threads;
- }
-
- if (agent_by_event_notifier_domain_ht_create()) {
- ERR("Failed to allocate per-event notifier domain agent hash table");
- retval = -1;
- goto stop_threads;
- }
- /*
- * These actions must be executed as root. We do that *after* setting up
- * the sockets path because we MUST make the check for another daemon using
- * those paths *before* trying to set the kernel consumer sockets and init
- * kernel tracer.
- */
- if (is_root) {
- if (set_consumer_sockets(&the_kconsumer_data)) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Setup kernel tracer */
- if (!the_config.no_kernel) {
- init_kernel_tracer();
- }
-
- /* Set ulimit for open files */
- set_ulimit();
- }
- /* init lttng_fd tracking must be done after set_ulimit. */
- lttng_fd_init();
-
- if (set_consumer_sockets(&the_ustconsumer64_data)) {
- retval = -1;
- goto stop_threads;
- }
-
- if (set_consumer_sockets(&the_ustconsumer32_data)) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Get parent pid if -S, --sig-parent is specified. */
- if (the_config.sig_parent) {
- the_ppid = getppid();
- }
-
- /* Setup the kernel pipe for waking up the kernel thread */
- if (is_root && !the_config.no_kernel) {
- if (utils_create_pipe_cloexec(the_kernel_poll_pipe)) {
- retval = -1;
- goto stop_threads;
- }
- }
-
- /* Setup the thread apps communication pipe. */
- if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Setup the thread apps notify communication pipe. */
- if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Initialize global buffer per UID and PID registry. */
- buffer_reg_init_uid_registry();
- buffer_reg_init_pid_registry();
-
- /* Init UST command queue. */
- cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
-
- cmd_init();
-
- /* Check for the application socket timeout env variable. */
- env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
- if (env_app_timeout) {
- the_config.app_socket_timeout = atoi(env_app_timeout);
- } else {
- the_config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
- }
-
- ret = write_pidfile();
- if (ret) {
- ERR("Error in write_pidfile");
- retval = -1;
- goto stop_threads;
- }
-
- /* Initialize communication library */
- lttcomm_init();
- /* Initialize TCP timeout values */
- lttcomm_inet_init();
-
- /* Create health-check thread. */
- if (!launch_health_management_thread()) {
- retval = -1;
- goto stop_threads;
- }
-
- /* notification_thread_data acquires the pipes' read side. */
- the_notification_thread_handle = notification_thread_handle_create(
- ust32_channel_monitor_pipe, ust64_channel_monitor_pipe,
- kernel_channel_monitor_pipe);
- if (!the_notification_thread_handle) {
- retval = -1;
- ERR("Failed to create notification thread shared data");
- goto stop_threads;
- }
-
- /* Create notification thread. */
- notification_thread = launch_notification_thread(
- the_notification_thread_handle);
- if (!notification_thread) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create timer thread. */
- if (!launch_timer_thread(&timer_thread_parameters)) {
- retval = -1;
- goto stop_threads;
- }
-
- /* rotation_thread_data acquires the pipes' read side. */
- rotation_thread_handle = rotation_thread_handle_create(
- rotation_timer_queue, the_notification_thread_handle);
- if (!rotation_thread_handle) {
- retval = -1;
- ERR("Failed to create rotation thread shared data");
- stop_threads();
- goto stop_threads;
- }
-
- /* Create rotation thread. */
- if (!launch_rotation_thread(rotation_thread_handle)) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create thread to manage the client socket */
- client_thread = launch_client_thread();
- if (!client_thread) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Set credentials of the client socket and rundir */
- if (is_root && set_permissions(the_config.rundir.value)) {
- retval = -1;
- goto stop_threads;
- }
-
- if (!launch_ust_dispatch_thread(&ust_cmd_queue, apps_cmd_pipe[1],
- apps_cmd_notify_pipe[1])) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create thread to manage application registration. */
- register_apps_thread = launch_application_registration_thread(
- &ust_cmd_queue);
- if (!register_apps_thread) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create thread to manage application socket */
- if (!launch_application_management_thread(apps_cmd_pipe[0])) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create thread to manage application notify socket */
- if (!launch_application_notification_thread(apps_cmd_notify_pipe[0])) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Create agent management thread. */
- if (!launch_agent_management_thread()) {
- retval = -1;
- goto stop_threads;
- }
-
- /* Don't start this thread if kernel tracing is not requested nor root */
- if (is_root && !the_config.no_kernel) {
- /* Create kernel thread to manage kernel event */
- if (!launch_kernel_management_thread(the_kernel_poll_pipe[0])) {
- retval = -1;
- goto stop_threads;
- }
-
- if (kernel_get_notification_fd() >= 0) {
- ret = notification_thread_command_add_tracer_event_source(
- the_notification_thread_handle,
- kernel_get_notification_fd(),
- LTTNG_DOMAIN_KERNEL);
- if (ret != LTTNG_OK) {
- ERR("Failed to add kernel trigger event source to notification thread");
- retval = -1;
- goto stop_threads;
- }
- }
- }
-
- /* Load sessions. */
- ret = config_load_session(
- the_config.load_session_path.value, NULL, 1, 1, NULL);
- if (ret) {
- ERR("Session load failed: %s", error_get_str(ret));
- retval = -1;
- goto stop_threads;
- }
-
- /* Initialization completed. */
- sessiond_signal_parents();
-
- /*
- * This is where we start awaiting program completion (e.g. through
- * signal that asks threads to teardown).
- */
-
- /* Initiate teardown once activity occurs on the quit pipe. */
- sessiond_wait_for_quit_pipe(-1);
-
-stop_threads:
-
- /*
- * Ensure that the client thread is no longer accepting new commands,
- * which could cause new sessions to be created.
- */
- if (client_thread) {
- lttng_thread_shutdown(client_thread);
- lttng_thread_put(client_thread);
- }
-
- destroy_all_sessions_and_wait();
-
- /*
- * At this point no new trigger can be registered (no sessions are
- * running/rotating) and clients can't connect to the session daemon
- * anymore. Unregister all triggers.
- */
- unregister_all_triggers();
-
- if (register_apps_thread) {
- lttng_thread_shutdown(register_apps_thread);
- lttng_thread_put(register_apps_thread);
- }
- lttng_thread_list_shutdown_orphans();
-
- /*
- * 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();
- /*
- * sessiond_cleanup() is called when no other thread is running, except
- * the ht_cleanup thread, which is needed to destroy the hash tables.
- */
- rcu_thread_online();
- sessiond_cleanup();
-
- /*
- * Wait for all pending call_rcu work to complete before shutting down
- * the notification thread. This call_rcu work includes shutting down
- * UST apps and event notifier pipes.
- */
- rcu_barrier();
-
- if (notification_thread) {
- lttng_thread_shutdown(notification_thread);
- lttng_thread_put(notification_thread);
- }
-
- /*
- * Error accounting teardown has to be done after the teardown of all
- * event notifier pipes to ensure that no tracer may try to use the
- * error accounting facilities.
- */
- event_notifier_error_accounting_fini();
-
- /*
- * Unloading the kernel modules needs to be done after all kernel
- * ressources have been released. In our case, this includes the
- * notification fd, the event notifier group fd, error accounting fd,
- * all event and event notifier fds, etc.
- *
- * In short, at this point, we need to have called close() on all fds
- * received from the kernel tracer.
- */
- if (is_root && !the_config.no_kernel) {
- DBG("Unloading kernel modules");
- modprobe_remove_lttng_all();
- }
-
- /*
- * Ensure all prior call_rcu are done. call_rcu callbacks may push
- * hash tables to the ht_cleanup thread. Therefore, we ensure that
- * the queue is empty before shutting down the clean-up thread.
- */
- rcu_barrier();
-
- if (ht_cleanup_thread) {
- lttng_thread_shutdown(ht_cleanup_thread);
- lttng_thread_put(ht_cleanup_thread);
- }
-
- rcu_thread_offline();
- rcu_unregister_thread();
-
- if (rotation_thread_handle) {
- rotation_thread_handle_destroy(rotation_thread_handle);
- }
-
- /*
- * After the rotation and timer thread have quit, we can safely destroy
- * the rotation_timer_queue.
- */
- rotation_thread_timer_queue_destroy(rotation_timer_queue);
- /*
- * The teardown of the notification system is performed after the
- * session daemon's teardown in order to allow it to be notified
- * of the active session and channels at the moment of the teardown.
- */
- if (the_notification_thread_handle) {
- notification_thread_handle_destroy(
- the_notification_thread_handle);
- }
- lttng_pipe_destroy(ust32_channel_monitor_pipe);
- lttng_pipe_destroy(ust64_channel_monitor_pipe);
- lttng_pipe_destroy(kernel_channel_monitor_pipe);
-
- if (the_health_sessiond) {
- health_app_destroy(the_health_sessiond);
- }
-exit_create_run_as_worker_cleanup:
-exit_options:
- sessiond_cleanup_lock_file();
- sessiond_cleanup_options();
-
-exit_set_signal_handler:
- if (!retval) {
- exit(EXIT_SUCCESS);
- } else {
- exit(EXIT_FAILURE);
- }
-}
projects / lttng-tools.git / blobdiff