+++ /dev/null
-/*
- * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * SPDX-License-Identifier: GPL-2.0-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <fcntl.h>
-#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/ipc.h>
-#include <sys/resource.h>
-#include <sys/shm.h>
-#include <sys/socket.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <urcu/list.h>
-#include <poll.h>
-#include <unistd.h>
-#include <sys/mman.h>
-#include <urcu/compiler.h>
-#include <inttypes.h>
-
-#include <common/defaults.h>
-#include <common/common.h>
-#include <common/consumer/consumer.h>
-#include <common/consumer/consumer-timer.h>
-#include <common/compat/poll.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/utils.h>
-#include <common/compat/getenv.h>
-#include <common/fd-tracker/utils.h>
-
-#include "lttng-relayd.h"
-#include "health-relayd.h"
-
-/* Global health check unix path */
-static
-char health_unix_sock_path[PATH_MAX];
-
-int health_quit_pipe[2] = { -1, -1 };
-
-/*
- * Check if the thread quit pipe was triggered.
- *
- * Return 1 if it was triggered else 0;
- */
-static
-int check_health_quit_pipe(int fd, uint32_t events)
-{
- if (fd == health_quit_pipe[0] && (events & LPOLLIN)) {
- return 1;
- }
-
- return 0;
-}
-
-/*
- * Send data on a unix socket using the liblttsessiondcomm API.
- *
- * Return lttcomm error code.
- */
-static int send_unix_sock(int sock, void *buf, size_t len)
-{
- /* Check valid length */
- if (len == 0) {
- return -1;
- }
-
- return lttcomm_send_unix_sock(sock, buf, len);
-}
-
-static int create_lttng_rundir_with_perm(const char *rundir)
-{
- int ret;
-
- DBG3("Creating LTTng run directory: %s", rundir);
-
- ret = mkdir(rundir, S_IRWXU);
- if (ret < 0) {
- if (errno != EEXIST) {
- ERR("Unable to create %s", rundir);
- goto error;
- } else {
- ret = 0;
- }
- } else if (ret == 0) {
- int is_root = !getuid();
-
- if (is_root) {
- gid_t gid;
-
- ret = utils_get_group_id(tracing_group_name, true, &gid);
- if (ret) {
- /* Default to root group. */
- gid = 0;
- }
-
- ret = chown(rundir, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", rundir);
- PERROR("chown");
- ret = -1;
- goto error;
- }
-
- ret = chmod(rundir,
- S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
- if (ret < 0) {
- ERR("Unable to set permissions on %s", health_unix_sock_path);
- PERROR("chmod");
- ret = -1;
- goto error;
- }
- }
- }
-
-error:
- return ret;
-}
-
-static
-int parse_health_env(void)
-{
- const char *health_path;
-
- health_path = lttng_secure_getenv(LTTNG_RELAYD_HEALTH_ENV);
- if (health_path) {
- strncpy(health_unix_sock_path, health_path,
- PATH_MAX);
- health_unix_sock_path[PATH_MAX - 1] = '\0';
- }
-
- return 0;
-}
-
-static
-int setup_health_path(void)
-{
- int is_root, ret = 0;
- const char *home_path = NULL;
- char *rundir = NULL, *relayd_path = NULL;
-
- ret = parse_health_env();
- if (ret) {
- return ret;
- }
-
- is_root = !getuid();
-
- if (is_root) {
- rundir = strdup(DEFAULT_LTTNG_RUNDIR);
- if (!rundir) {
- ret = -ENOMEM;
- goto end;
- }
- } else {
- /*
- * Create rundir from home path. This will create something like
- * $HOME/.lttng
- */
- home_path = utils_get_home_dir();
-
- if (home_path == NULL) {
- /* TODO: Add --socket PATH option */
- ERR("Can't get HOME directory for sockets creation.");
- ret = -EPERM;
- goto end;
- }
-
- ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
- if (ret < 0) {
- ret = -ENOMEM;
- goto end;
- }
- }
-
- ret = asprintf(&relayd_path, DEFAULT_RELAYD_PATH, rundir);
- if (ret < 0) {
- ret = -ENOMEM;
- goto end;
- }
-
- ret = create_lttng_rundir_with_perm(rundir);
- if (ret < 0) {
- goto end;
- }
-
- ret = create_lttng_rundir_with_perm(relayd_path);
- if (ret < 0) {
- goto end;
- }
-
- if (is_root) {
- if (strlen(health_unix_sock_path) != 0) {
- goto end;
- }
- snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
- DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK,
- (int) getpid());
- } else {
- /* Set health check Unix path */
- if (strlen(health_unix_sock_path) != 0) {
- goto end;
- }
-
- snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
- DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK,
- home_path, (int) getpid());
- }
-
-end:
- free(rundir);
- free(relayd_path);
- return ret;
-}
-
-static
-int accept_unix_socket(void *data, int *out_fd)
-{
- int ret;
- int accepting_sock = *((int *) data);
-
- ret = lttcomm_accept_unix_sock(accepting_sock);
- if (ret < 0) {
- goto end;
- }
-
- *out_fd = ret;
- ret = 0;
-end:
- return ret;
-}
-
-static
-int open_unix_socket(void *data, int *out_fd)
-{
- int ret;
- const char *path = data;
-
- ret = lttcomm_create_unix_sock(path);
- if (ret < 0) {
- goto end;
- }
-
- *out_fd = ret;
- ret = 0;
-end:
- return ret;
-}
-
-/*
- * Thread managing health check socket.
- */
-void *thread_manage_health(void *data)
-{
- int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
- uint32_t revents, nb_fd;
- struct lttng_poll_event events;
- struct health_comm_msg msg;
- struct health_comm_reply reply;
- int is_root;
- char *sock_name;
-
- DBG("[thread] Manage health check started");
-
- setup_health_path();
-
- rcu_register_thread();
-
- /* We might hit an error path before this is created. */
- lttng_poll_init(&events);
-
- /* Create unix socket */
- ret = asprintf(&sock_name, "Unix socket @ %s", health_unix_sock_path);
- if (ret == -1) {
- PERROR("Failed to allocate unix socket name");
- err = -1;
- goto error;
- }
- ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &sock,
- (const char **) &sock_name, 1, open_unix_socket,
- health_unix_sock_path);
- free(sock_name);
- if (ret < 0) {
- ERR("Unable to create health check Unix socket");
- err = -1;
- goto error;
- }
-
- is_root = !getuid();
- if (is_root) {
- /* lttng health client socket path permissions */
- gid_t gid;
-
- ret = utils_get_group_id(tracing_group_name, true, &gid);
- if (ret) {
- /* Default to root group. */
- gid = 0;
- }
-
- ret = chown(health_unix_sock_path, 0, gid);
- if (ret < 0) {
- ERR("Unable to set group on %s", health_unix_sock_path);
- PERROR("chown");
- err = -1;
- goto error;
- }
-
- ret = chmod(health_unix_sock_path,
- S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
- if (ret < 0) {
- ERR("Unable to set permissions on %s", health_unix_sock_path);
- PERROR("chmod");
- err = -1;
- goto error;
- }
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- (void) utils_set_fd_cloexec(sock);
-
- ret = lttcomm_listen_unix_sock(sock);
- if (ret < 0) {
- goto error;
- }
-
- /* Size is set to 2 for the unix socket and quit pipe. */
- ret = fd_tracker_util_poll_create(the_fd_tracker,
- "Health management thread epoll", &events, 2,
- LTTNG_CLOEXEC);
- if (ret < 0) {
- ERR("Poll set creation failed");
- goto error;
- }
-
- ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN);
- if (ret < 0) {
- goto error;
- }
-
- /* Add the application registration socket */
- ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
- if (ret < 0) {
- goto error;
- }
-
- lttng_relay_notify_ready();
-
- while (1) {
- char *accepted_socket_name;
-
- DBG("Health check ready");
-
- /* Inifinite blocking call, waiting for transmission */
-restart:
- ret = lttng_poll_wait(&events, -1);
- if (ret < 0) {
- /*
- * Restart interrupted system call.
- */
- if (errno == EINTR) {
- goto restart;
- }
- goto error;
- }
-
- nb_fd = ret;
-
- for (i = 0; i < nb_fd; i++) {
- /* 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_health_quit_pipe(pollfd, revents);
- if (ret) {
- err = 0;
- goto exit;
- }
-
- /* Event on the registration socket */
- if (pollfd == sock) {
- if (revents & LPOLLIN) {
- continue;
- } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
- ERR("Health socket poll error");
- goto error;
- } else {
- ERR("Unexpected poll events %u for sock %d", revents, pollfd);
- goto error;
- }
- }
- }
-
- ret = asprintf(&accepted_socket_name, "Socket accepted from unix socket @ %s",
- health_unix_sock_path);
- if (ret == -1) {
- PERROR("Failed to allocate name of accepted socket from unix socket @ %s",
- health_unix_sock_path);
- goto error;
- }
- ret = fd_tracker_open_unsuspendable_fd(the_fd_tracker, &new_sock,
- (const char **) &accepted_socket_name, 1,
- accept_unix_socket, &sock);
- free(accepted_socket_name);
- if (ret < 0) {
- goto error;
- }
-
- /*
- * Set the CLOEXEC flag. Return code is useless because either way, the
- * show must go on.
- */
- (void) utils_set_fd_cloexec(new_sock);
-
- DBG("Receiving data from client for health...");
- ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
- if (ret <= 0) {
- DBG("Nothing recv() from client... continuing");
- ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker,
- &new_sock, 1, fd_tracker_util_close_fd,
- NULL);
- if (ret) {
- PERROR("close");
- }
- new_sock = -1;
- continue;
- }
-
- rcu_thread_online();
-
- LTTNG_ASSERT(msg.cmd == HEALTH_CMD_CHECK);
-
- memset(&reply, 0, sizeof(reply));
- for (i = 0; i < NR_HEALTH_RELAYD_TYPES; i++) {
- /*
- * health_check_state return 0 if thread is in
- * error.
- */
- if (!health_check_state(health_relayd, i)) {
- reply.ret_code |= 1ULL << i;
- }
- }
-
- DBG2("Health check return value %" PRIx64, reply.ret_code);
-
- ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
- if (ret < 0) {
- ERR("Failed to send health data back to client");
- }
-
- /* End of transmission */
- ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker,
- &new_sock, 1, fd_tracker_util_close_fd,
- NULL);
- if (ret) {
- PERROR("close");
- }
- new_sock = -1;
- }
-
-error:
- lttng_relay_stop_threads();
-exit:
- if (err) {
- ERR("Health error occurred in %s", __func__);
- }
- DBG("Health check thread dying");
- unlink(health_unix_sock_path);
- if (sock >= 0) {
- ret = fd_tracker_close_unsuspendable_fd(the_fd_tracker, &sock,
- 1, fd_tracker_util_close_fd, NULL);
- if (ret) {
- PERROR("close");
- }
- }
-
- /*
- * We do NOT rmdir rundir nor the relayd path because there are
- * other processes using them.
- */
-
- (void) fd_tracker_util_poll_clean(the_fd_tracker, &events);
-
- rcu_unregister_thread();
- return NULL;
-}
projects / lttng-tools.git / blobdiff