-/*
- * lttng-ctl.c
- *
- * Linux Trace Toolkit Control Library
- *
- * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
- * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#define _LGPL_SOURCE
-#include <grp.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <common/bytecode/bytecode.h>
-#include <common/align.h>
-#include <common/common.h>
-#include <common/compat/errno.h>
-#include <common/compat/string.h>
-#include <common/defaults.h>
-#include <common/dynamic-array.h>
-#include <common/dynamic-buffer.h>
-#include <common/payload-view.h>
-#include <common/payload.h>
-#include <common/sessiond-comm/sessiond-comm.h>
-#include <common/tracker.h>
-#include <common/unix.h>
-#include <common/uri.h>
-#include <common/utils.h>
-#include <lttng/channel-internal.h>
-#include <lttng/destruction-handle.h>
-#include <lttng/endpoint.h>
-#include <lttng/error-query-internal.h>
-#include <lttng/event-internal.h>
-#include <lttng/health-internal.h>
-#include <lttng/lttng-error.h>
-#include <lttng/lttng.h>
-#include <lttng/session-descriptor-internal.h>
-#include <lttng/session-internal.h>
-#include <lttng/trigger/trigger-internal.h>
-#include <lttng/userspace-probe-internal.h>
-
-#include "lttng-ctl-helper.h"
-#include <common/filter/filter-ast.h>
-#include <common/filter/filter-parser.h>
-#include <common/filter/memstream.h>
-
-#define COPY_DOMAIN_PACKED(dst, src) \
-do { \
- struct lttng_domain _tmp_domain; \
- \
- lttng_ctl_copy_lttng_domain(&_tmp_domain, &src); \
- dst = _tmp_domain; \
-} while (0)
-
-/* Socket to session daemon for communication */
-static int sessiond_socket = -1;
-static char sessiond_sock_path[PATH_MAX];
-
-/* Variables */
-static char *tracing_group;
-static int connected;
-
-/* Global */
-
-/*
- * Those two variables are used by error.h to silent or control the verbosity of
- * error message. They are global to the library so application linking with it
- * are able to compile correctly and also control verbosity of the library.
- */
-int lttng_opt_quiet;
-int lttng_opt_verbose;
-int lttng_opt_mi;
-
-/*
- * Copy domain to lttcomm_session_msg domain.
- *
- * If domain is unknown, default domain will be the kernel.
- */
-void lttng_ctl_copy_lttng_domain(struct lttng_domain *dst,
- struct lttng_domain *src)
-{
- if (src && dst) {
- switch (src->type) {
- case LTTNG_DOMAIN_KERNEL:
- case LTTNG_DOMAIN_UST:
- case LTTNG_DOMAIN_JUL:
- case LTTNG_DOMAIN_LOG4J:
- case LTTNG_DOMAIN_PYTHON:
- memcpy(dst, src, sizeof(struct lttng_domain));
- break;
- default:
- memset(dst, 0, sizeof(struct lttng_domain));
- break;
- }
- }
-}
-
-/*
- * Send lttcomm_session_msg to the session daemon.
- *
- * On success, returns the number of bytes sent (>=0)
- * On error, returns -1
- */
-static int send_session_msg(struct lttcomm_session_msg *lsm)
-{
- int ret;
-
- if (!connected) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto end;
- }
-
- DBG("LSM cmd type: '%s' (%d)", lttcomm_sessiond_command_str(lsm->cmd_type),
- lsm->cmd_type);
-
- ret = lttcomm_send_creds_unix_sock(sessiond_socket, lsm,
- sizeof(struct lttcomm_session_msg));
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- }
-
-end:
- return ret;
-}
-
-/*
- * Send var len data to the session daemon.
- *
- * On success, returns the number of bytes sent (>=0)
- * On error, returns -1
- */
-static int send_session_varlen(const void *data, size_t len)
-{
- int ret;
-
- if (!connected) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto end;
- }
-
- if (!data || !len) {
- ret = 0;
- goto end;
- }
-
- ret = lttcomm_send_unix_sock(sessiond_socket, data, len);
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- }
-
-end:
- return ret;
-}
-
-/*
- * Send file descriptors to the session daemon.
- *
- * On success, returns the number of bytes sent (>=0)
- * On error, returns -1
- */
-static int send_session_fds(const int *fds, size_t nb_fd)
-{
- int ret;
-
- if (!connected) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto end;
- }
-
- if (!fds || !nb_fd) {
- ret = 0;
- goto end;
- }
-
- ret = lttcomm_send_fds_unix_sock(sessiond_socket, fds, nb_fd);
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- }
-
-end:
- return ret;
-}
-
-/*
- * Receive data from the sessiond socket.
- *
- * On success, returns the number of bytes received (>=0)
- * On error, returns a negative lttng_error_code.
- */
-static int recv_data_sessiond(void *buf, size_t len)
-{
- int ret;
-
- LTTNG_ASSERT(len > 0);
-
- if (!connected) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto end;
- }
-
- ret = lttcomm_recv_unix_sock(sessiond_socket, buf, len);
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- } else if (ret == 0) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- }
-
-end:
- return ret;
-}
-
-/*
- * Receive a payload from the session daemon by appending to an existing
- * payload.
- * On success, returns the number of bytes received (>=0)
- * On error, returns a negative lttng_error_code.
- */
-static int recv_payload_sessiond(struct lttng_payload *payload, size_t len)
-{
- int ret;
- const size_t original_payload_size = payload->buffer.size;
-
- ret = lttng_dynamic_buffer_set_size(
- &payload->buffer, payload->buffer.size + len);
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
-
- ret = recv_data_sessiond(
- payload->buffer.data + original_payload_size, len);
-end:
- return ret;
-}
-
-/*
- * Check if we are in the specified group.
- *
- * If yes return 1, else return -1.
- */
-int lttng_check_tracing_group(void)
-{
- gid_t *grp_list, tracing_gid;
- int grp_list_size, grp_id, i;
- int ret = -1;
- const char *grp_name = tracing_group;
-
- /* Get GID of group 'tracing' */
- if (utils_get_group_id(grp_name, false, &tracing_gid)) {
- /* If grp_tracing is NULL, the group does not exist. */
- goto end;
- }
-
- /* Get number of supplementary group IDs */
- grp_list_size = getgroups(0, NULL);
- if (grp_list_size < 0) {
- PERROR("getgroups");
- goto end;
- }
-
- /* Alloc group list of the right size */
- grp_list = zmalloc(grp_list_size * sizeof(gid_t));
- if (!grp_list) {
- PERROR("malloc");
- goto end;
- }
- grp_id = getgroups(grp_list_size, grp_list);
- if (grp_id < 0) {
- PERROR("getgroups");
- goto free_list;
- }
-
- for (i = 0; i < grp_list_size; i++) {
- if (grp_list[i] == tracing_gid) {
- ret = 1;
- break;
- }
- }
-
-free_list:
- free(grp_list);
-
-end:
- return ret;
-}
-
-static int check_enough_available_memory(size_t num_bytes_requested_per_cpu)
-{
- int ret;
- long num_cpu;
- size_t best_mem_info;
- size_t num_bytes_requested_total;
-
- /*
- * Get the number of CPU currently online to compute the amount of
- * memory needed to create a buffer for every CPU.
- */
- num_cpu = sysconf(_SC_NPROCESSORS_ONLN);
- if (num_cpu == -1) {
- goto error;
- }
-
- num_bytes_requested_total = num_bytes_requested_per_cpu * num_cpu;
-
- /*
- * Try to get the `MemAvail` field of `/proc/meminfo`. This is the most
- * reliable estimate we can get but it is only exposed by the kernel
- * since 3.14. (See Linux kernel commit:
- * 34e431b0ae398fc54ea69ff85ec700722c9da773)
- */
- ret = utils_get_memory_available(&best_mem_info);
- if (ret >= 0) {
- goto success;
- }
-
- /*
- * As a backup plan, use `MemTotal` field of `/proc/meminfo`. This
- * is a sanity check for obvious user error.
- */
- ret = utils_get_memory_total(&best_mem_info);
- if (ret >= 0) {
- goto success;
- }
-
-error:
- return -1;
-success:
- return best_mem_info >= num_bytes_requested_total;
-}
-
-/*
- * Try connect to session daemon with sock_path.
- *
- * Return 0 on success, else -1
- */
-static int try_connect_sessiond(const char *sock_path)
-{
- int ret;
-
- /* If socket exist, we check if the daemon listens for connect. */
- ret = access(sock_path, F_OK);
- if (ret < 0) {
- /* Not alive */
- goto error;
- }
-
- ret = lttcomm_connect_unix_sock(sock_path);
- if (ret < 0) {
- /* Not alive. */
- goto error;
- }
-
- ret = lttcomm_close_unix_sock(ret);
- if (ret < 0) {
- PERROR("lttcomm_close_unix_sock");
- }
-
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Set sessiond socket path by putting it in the global sessiond_sock_path
- * variable.
- *
- * Returns 0 on success, negative value on failure (the sessiond socket path
- * is somehow too long or ENOMEM).
- */
-static int set_session_daemon_path(void)
-{
- int in_tgroup = 0; /* In tracing group. */
- uid_t uid;
-
- uid = getuid();
-
- if (uid != 0) {
- /* Are we in the tracing group ? */
- in_tgroup = lttng_check_tracing_group();
- }
-
- if ((uid == 0) || in_tgroup == 1) {
- const int ret = lttng_strncpy(sessiond_sock_path,
- DEFAULT_GLOBAL_CLIENT_UNIX_SOCK,
- sizeof(sessiond_sock_path));
-
- if (ret) {
- goto error;
- }
- }
-
- if (uid != 0) {
- int ret;
-
- if (in_tgroup) {
- /* Tracing group. */
- ret = try_connect_sessiond(sessiond_sock_path);
- if (ret >= 0) {
- goto end;
- }
- /* Global session daemon not available... */
- }
- /* ...or not in tracing group (and not root), default */
-
- /*
- * With GNU C < 2.1, snprintf returns -1 if the target buffer
- * is too small;
- * With GNU C >= 2.1, snprintf returns the required size
- * (excluding closing null)
- */
- ret = snprintf(sessiond_sock_path, sizeof(sessiond_sock_path),
- DEFAULT_HOME_CLIENT_UNIX_SOCK, utils_get_home_dir());
- if ((ret < 0) || (ret >= sizeof(sessiond_sock_path))) {
- goto error;
- }
- }
-end:
- return 0;
-
-error:
- return -1;
-}
-
-/*
- * Connect to the LTTng session daemon.
- *
- * On success, return the socket's file descriptor. On error, return -1.
- */
-int connect_sessiond(void)
-{
- int ret;
-
- ret = set_session_daemon_path();
- if (ret < 0) {
- goto error;
- }
-
- /* Connect to the sesssion daemon. */
- ret = lttcomm_connect_unix_sock(sessiond_sock_path);
- if (ret < 0) {
- goto error;
- }
-
- return ret;
-
-error:
- return -1;
-}
-
-static void reset_global_sessiond_connection_state(void)
-{
- sessiond_socket = -1;
- connected = 0;
-}
-
-/*
- * Clean disconnect from the session daemon.
- *
- * On success, return 0. On error, return -1.
- */
-static int disconnect_sessiond(void)
-{
- int ret = 0;
-
- if (connected) {
- ret = lttcomm_close_unix_sock(sessiond_socket);
- reset_global_sessiond_connection_state();
- }
-
- return ret;
-}
-
-static int recv_sessiond_optional_data(size_t len, void **user_buf,
- size_t *user_len)
-{
- int ret = 0;
- void *buf = NULL;
-
- if (len) {
- if (!user_len) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- buf = zmalloc(len);
- if (!buf) {
- ret = -ENOMEM;
- goto end;
- }
-
- ret = recv_data_sessiond(buf, len);
- if (ret < 0) {
- goto end;
- }
-
- if (!user_buf) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- /* Move ownership of command header buffer to user. */
- *user_buf = buf;
- buf = NULL;
- *user_len = len;
- } else {
- /* No command header. */
- if (user_len) {
- *user_len = 0;
- }
-
- if (user_buf) {
- *user_buf = NULL;
- }
- }
-
-end:
- free(buf);
- return ret;
-}
-
-/*
- * Ask the session daemon a specific command and put the data into buf.
- * Takes extra var. len. data and file descriptors as input to send to the
- * session daemon.
- *
- * Return size of data (only payload, not header) or a negative error code.
- */
-int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
- const int *fds, size_t nb_fd, const void *vardata,
- size_t vardata_len, void **user_payload_buf,
- void **user_cmd_header_buf, size_t *user_cmd_header_len)
-{
- int ret;
- size_t payload_len;
- struct lttcomm_lttng_msg llm;
-
- ret = connect_sessiond();
- if (ret < 0) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto end;
- } else {
- sessiond_socket = ret;
- connected = 1;
- }
-
- ret = send_session_msg(lsm);
- if (ret < 0) {
- /* Ret value is a valid lttng error code. */
- goto end;
- }
- /* Send var len data */
- ret = send_session_varlen(vardata, vardata_len);
- if (ret < 0) {
- /* Ret value is a valid lttng error code. */
- goto end;
- }
-
- /* Send fds */
- ret = send_session_fds(fds, nb_fd);
- if (ret < 0) {
- /* Ret value is a valid lttng error code. */
- goto end;
- }
-
- /* Get header from data transmission */
- ret = recv_data_sessiond(&llm, sizeof(llm));
- if (ret < 0) {
- /* Ret value is a valid lttng error code. */
- goto end;
- }
-
- /* Check error code if OK */
- if (llm.ret_code != LTTNG_OK) {
- ret = -llm.ret_code;
- goto end;
- }
-
- /* Get command header from data transmission */
- ret = recv_sessiond_optional_data(llm.cmd_header_size,
- user_cmd_header_buf, user_cmd_header_len);
- if (ret < 0) {
- goto end;
- }
-
- /* Get payload from data transmission */
- ret = recv_sessiond_optional_data(llm.data_size, user_payload_buf,
- &payload_len);
- if (ret < 0) {
- goto end;
- }
-
- ret = llm.data_size;
-
-end:
- disconnect_sessiond();
- return ret;
-}
-
-int lttng_ctl_ask_sessiond_payload(struct lttng_payload_view *message,
- struct lttng_payload *reply)
-{
- int ret;
- struct lttcomm_lttng_msg llm;
- const int fd_count = lttng_payload_view_get_fd_handle_count(message);
-
- LTTNG_ASSERT(reply->buffer.size == 0);
- LTTNG_ASSERT(lttng_dynamic_pointer_array_get_count(&reply->_fd_handles) == 0);
-
- ret = connect_sessiond();
- if (ret < 0) {
- ret = -LTTNG_ERR_NO_SESSIOND;
- goto end;
- } else {
- sessiond_socket = ret;
- connected = 1;
- }
-
- /* Send command to session daemon */
- ret = lttcomm_send_creds_unix_sock(sessiond_socket, message->buffer.data,
- message->buffer.size);
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- goto end;
- }
-
- if (fd_count > 0) {
- ret = lttcomm_send_payload_view_fds_unix_sock(sessiond_socket,
- message);
- if (ret < 0) {
- ret = -LTTNG_ERR_FATAL;
- goto end;
- }
- }
-
- /* Get header from data transmission */
- ret = recv_payload_sessiond(reply, sizeof(llm));
- if (ret < 0) {
- /* Ret value is a valid lttng error code. */
- goto end;
- }
-
- llm = *((typeof(llm) *) reply->buffer.data);
-
- /* Check error code if OK */
- if (llm.ret_code != LTTNG_OK) {
- if (llm.ret_code < LTTNG_OK || llm.ret_code >= LTTNG_ERR_NR) {
- /* Invalid error code received. */
- ret = -LTTNG_ERR_UNK;
- } else {
- ret = -llm.ret_code;
- }
- goto end;
- }
-
- if (llm.cmd_header_size > 0) {
- ret = recv_payload_sessiond(reply, llm.cmd_header_size);
- if (ret < 0) {
- goto end;
- }
- }
-
- /* Get command header from data transmission */
- if (llm.data_size > 0) {
- ret = recv_payload_sessiond(reply, llm.data_size);
- if (ret < 0) {
- goto end;
- }
- }
-
- if (llm.fd_count > 0) {
- ret = lttcomm_recv_payload_fds_unix_sock(
- sessiond_socket, llm.fd_count, reply);
- if (ret < 0) {
- goto end;
- }
- }
-
- /* Don't return the llm header to the caller. */
- memmove(reply->buffer.data, reply->buffer.data + sizeof(llm),
- reply->buffer.size - sizeof(llm));
- ret = lttng_dynamic_buffer_set_size(
- &reply->buffer, reply->buffer.size - sizeof(llm));
- if (ret) {
- /* Can't happen as size is reduced. */
- abort();
- }
-
- ret = reply->buffer.size;
-
-end:
- disconnect_sessiond();
- return ret;
-}
-
-/*
- * Create lttng handle and return pointer.
- *
- * The returned pointer will be NULL in case of malloc() error.
- */
-struct lttng_handle *lttng_create_handle(const char *session_name,
- struct lttng_domain *domain)
-{
- int ret;
- struct lttng_handle *handle = NULL;
-
- handle = zmalloc(sizeof(struct lttng_handle));
- if (handle == NULL) {
- PERROR("malloc handle");
- goto end;
- }
-
- /* Copy session name */
- ret = lttng_strncpy(handle->session_name, session_name ? : "",
- sizeof(handle->session_name));
- if (ret) {
- goto error;
- }
-
- /* Copy lttng domain or leave initialized to 0. */
- if (domain) {
- lttng_ctl_copy_lttng_domain(&handle->domain, domain);
- }
-
-end:
- return handle;
-error:
- free(handle);
- return NULL;
-}
-
-/*
- * Destroy handle by free(3) the pointer.
- */
-void lttng_destroy_handle(struct lttng_handle *handle)
-{
- free(handle);
-}
-
-/*
- * Register an outside consumer.
- *
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_register_consumer(struct lttng_handle *handle,
- const char *socket_path)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (handle == NULL || socket_path == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_REGISTER_CONSUMER;
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_strncpy(lsm.u.reg.path, socket_path,
- sizeof(lsm.u.reg.path));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-end:
- return ret;
-}
-
-/*
- * Start tracing for all traces of the session.
- *
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_start_tracing(const char *session_name)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (session_name == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_START_TRACE;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-end:
- return ret;
-}
-
-/*
- * Stop tracing for all traces of the session.
- */
-static int _lttng_stop_tracing(const char *session_name, int wait)
-{
- int ret, data_ret;
- struct lttcomm_session_msg lsm;
-
- if (session_name == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_STOP_TRACE;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
- if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
- goto error;
- }
-
- if (!wait) {
- goto end;
- }
-
- /* Check for data availability */
- do {
- data_ret = lttng_data_pending(session_name);
- if (data_ret < 0) {
- /* Return the data available call error. */
- ret = data_ret;
- goto error;
- }
-
- /*
- * Data sleep time before retrying (in usec). Don't sleep if the
- * call returned value indicates availability.
- */
- if (data_ret) {
- usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
- }
- } while (data_ret != 0);
-
-end:
-error:
- return ret;
-}
-
-/*
- * Stop tracing and wait for data availability.
- */
-int lttng_stop_tracing(const char *session_name)
-{
- return _lttng_stop_tracing(session_name, 1);
-}
-
-/*
- * Stop tracing but _don't_ wait for data availability.
- */
-int lttng_stop_tracing_no_wait(const char *session_name)
-{
- return _lttng_stop_tracing(session_name, 0);
-}
-
-/*
- * Add context to a channel.
- *
- * If the given channel is NULL, add the contexts to all channels.
- * The event_name param is ignored.
- *
- * Returns the size of the returned payload data or a negative error code.
- */
-int lttng_add_context(struct lttng_handle *handle,
- struct lttng_event_context *ctx, const char *event_name,
- const char *channel_name)
-{
- int ret;
- size_t len = 0;
- char *buf = NULL;
- struct lttcomm_session_msg lsm;
-
- /* Safety check. Both are mandatory. */
- if (handle == NULL || ctx == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_ADD_CONTEXT;
-
- /* If no channel name, send empty string. */
- ret = lttng_strncpy(lsm.u.context.channel_name, channel_name ?: "",
- sizeof(lsm.u.context.channel_name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
- size_t provider_len, ctx_len;
- const char *provider_name = ctx->u.app_ctx.provider_name;
- const char *ctx_name = ctx->u.app_ctx.ctx_name;
-
- if (!provider_name || !ctx_name) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- provider_len = strlen(provider_name);
- if (provider_len == 0) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- lsm.u.context.provider_name_len = provider_len;
-
- ctx_len = strlen(ctx_name);
- if (ctx_len == 0) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- lsm.u.context.context_name_len = ctx_len;
-
- len = provider_len + ctx_len;
- buf = zmalloc(len);
- if (!buf) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
-
- memcpy(buf, provider_name, provider_len);
- memcpy(buf + provider_len, ctx_name, ctx_len);
- }
- memcpy(&lsm.u.context.ctx, ctx, sizeof(struct lttng_event_context));
-
- if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
- /*
- * Don't leak application addresses to the sessiond.
- * This is only necessary when ctx is for an app ctx otherwise
- * the values inside the union (type & config) are overwritten.
- */
- lsm.u.context.ctx.u.app_ctx.provider_name = NULL;
- lsm.u.context.ctx.u.app_ctx.ctx_name = NULL;
- }
-
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, buf, len, NULL);
-end:
- free(buf);
- return ret;
-}
-
-/*
- * Enable event(s) for a channel.
- *
- * If no event name is specified, all events are enabled.
- * If no channel name is specified, the default 'channel0' is used.
- *
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_enable_event(struct lttng_handle *handle,
- struct lttng_event *ev, const char *channel_name)
-{
- return lttng_enable_event_with_exclusions(handle, ev, channel_name,
- NULL, 0, NULL);
-}
-
-/*
- * Create or enable an event with a filter expression.
- *
- * Return negative error value on error.
- * Return size of returned session payload data if OK.
- */
-int lttng_enable_event_with_filter(struct lttng_handle *handle,
- struct lttng_event *event, const char *channel_name,
- const char *filter_expression)
-{
- return lttng_enable_event_with_exclusions(handle, event, channel_name,
- filter_expression, 0, NULL);
-}
-
-/*
- * Depending on the event, return a newly allocated agent filter expression or
- * NULL if not applicable.
- *
- * An event with NO loglevel and the name is * will return NULL.
- */
-static char *set_agent_filter(const char *filter, struct lttng_event *ev)
-{
- int err;
- char *agent_filter = NULL;
-
- LTTNG_ASSERT(ev);
-
- /* Don't add filter for the '*' event. */
- if (strcmp(ev->name, "*") != 0) {
- if (filter) {
- err = asprintf(&agent_filter, "(%s) && (logger_name == \"%s\")", filter,
- ev->name);
- } else {
- err = asprintf(&agent_filter, "logger_name == \"%s\"", ev->name);
- }
- if (err < 0) {
- PERROR("asprintf");
- goto error;
- }
- }
-
- /* Add loglevel filtering if any for the JUL domain. */
- if (ev->loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) {
- const char *op;
-
- if (ev->loglevel_type == LTTNG_EVENT_LOGLEVEL_RANGE) {
- op = ">=";
- } else {
- op = "==";
- }
-
- if (filter || agent_filter) {
- char *new_filter;
-
- err = asprintf(&new_filter, "(%s) && (int_loglevel %s %d)",
- agent_filter ? agent_filter : filter, op,
- ev->loglevel);
- if (agent_filter) {
- free(agent_filter);
- }
- agent_filter = new_filter;
- } else {
- err = asprintf(&agent_filter, "int_loglevel %s %d", op,
- ev->loglevel);
- }
- if (err < 0) {
- PERROR("asprintf");
- goto error;
- }
- }
-
- return agent_filter;
-error:
- free(agent_filter);
- return NULL;
-}
-
-/*
- * Enable event(s) for a channel, possibly with exclusions and a filter.
- * If no event name is specified, all events are enabled.
- * If no channel name is specified, the default name is used.
- * If filter expression is not NULL, the filter is set for the event.
- * If exclusion count is not zero, the exclusions are set for the event.
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
- struct lttng_event *ev, const char *channel_name,
- const char *original_filter_expression,
- int exclusion_count, char **exclusion_list)
-{
- struct lttcomm_session_msg lsm;
- struct lttng_payload payload;
- int ret = 0, i;
- unsigned int free_filter_expression = 0;
- struct filter_parser_ctx *ctx = NULL;
-
- /*
- * We have either a filter or some exclusions, so we need to set up
- * a variable-length payload from where to send the data.
- */
- lttng_payload_init(&payload);
-
- /*
- * Cast as non-const since we may replace the filter expression
- * by a dynamically allocated string. Otherwise, the original
- * string is not modified.
- */
- char *filter_expression = (char *) original_filter_expression;
-
- if (handle == NULL || ev == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- /*
- * Empty filter string will always be rejected by the parser
- * anyway, so treat this corner-case early to eliminate
- * lttng_fmemopen error for 0-byte allocation.
- */
- if (filter_expression && filter_expression[0] == '\0') {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- memset(&lsm, 0, sizeof(lsm));
-
- /* If no channel name, send empty string. */
- ret = lttng_strncpy(lsm.u.enable.channel_name, channel_name ?: "",
- sizeof(lsm.u.enable.channel_name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- lsm.cmd_type = LTTNG_ENABLE_EVENT;
- if (ev->name[0] == '\0') {
- /* Enable all events. */
- ret = lttng_strncpy(ev->name, "*", sizeof(ev->name));
- LTTNG_ASSERT(ret == 0);
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- memcpy(&lsm.u.enable.event, ev, sizeof(lsm.u.enable.event));
-
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- lsm.u.enable.exclusion_count = exclusion_count;
- lsm.u.enable.bytecode_len = 0;
-
- /* Parse filter expression. */
- if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
- || handle->domain.type == LTTNG_DOMAIN_LOG4J
- || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
- if (handle->domain.type == LTTNG_DOMAIN_JUL ||
- handle->domain.type == LTTNG_DOMAIN_LOG4J ||
- handle->domain.type == LTTNG_DOMAIN_PYTHON) {
- char *agent_filter;
-
- /* Setup JUL filter if needed. */
- agent_filter = set_agent_filter(filter_expression, ev);
- if (!agent_filter) {
- if (!filter_expression) {
- /*
- * No JUL and no filter, just skip
- * everything below.
- */
- goto ask_sessiond;
- }
- } else {
- /*
- * With an agent filter, the original filter has
- * been added to it thus replace the filter
- * expression.
- */
- filter_expression = agent_filter;
- free_filter_expression = 1;
- }
- }
-
- ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx);
- if (ret) {
- goto filter_error;
- }
-
- lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
- + bytecode_get_len(&ctx->bytecode->b);
- lsm.u.enable.expression_len = strlen(filter_expression) + 1;
- }
-
- ret = lttng_dynamic_buffer_set_capacity(&payload.buffer,
- lsm.u.enable.bytecode_len +
- lsm.u.enable.expression_len +
- LTTNG_SYMBOL_NAME_LEN *
- exclusion_count);
- if (ret) {
- ret = -LTTNG_ERR_EXCLUSION_NOMEM;
- goto mem_error;
- }
-
- /* Put exclusion names first in the data. */
- for (i = 0; i < exclusion_count; i++) {
- size_t exclusion_len;
-
- exclusion_len = lttng_strnlen(exclusion_list[i],
- LTTNG_SYMBOL_NAME_LEN);
- if (exclusion_len == LTTNG_SYMBOL_NAME_LEN) {
- /* Exclusion is not NULL-terminated. */
- ret = -LTTNG_ERR_INVALID;
- goto mem_error;
- }
-
- ret = lttng_dynamic_buffer_append(&payload.buffer,
- exclusion_list[i], exclusion_len);
- if (ret) {
- goto mem_error;
- }
-
- /*
- * Padding the rest of the entry with zeros. Every exclusion
- * entries take LTTNG_SYMBOL_NAME_LEN bytes in the buffer.
- */
- ret = lttng_dynamic_buffer_set_size(&payload.buffer,
- LTTNG_SYMBOL_NAME_LEN * (i + 1));
- if (ret) {
- goto mem_error;
- }
- }
-
- /* Add filter expression next. */
- if (filter_expression) {
- ret = lttng_dynamic_buffer_append(&payload.buffer,
- filter_expression, lsm.u.enable.expression_len);
- if (ret) {
- goto mem_error;
- }
- }
- /* Add filter bytecode next. */
- if (ctx && lsm.u.enable.bytecode_len != 0) {
- ret = lttng_dynamic_buffer_append(&payload.buffer,
- &ctx->bytecode->b, lsm.u.enable.bytecode_len);
- if (ret) {
- goto mem_error;
- }
- }
- if (ev->extended.ptr) {
- struct lttng_event_extended *ev_ext =
- (struct lttng_event_extended *) ev->extended.ptr;
-
- if (ev_ext->probe_location) {
- /*
- * lttng_userspace_probe_location_serialize returns the
- * number of bytes that was appended to the buffer.
- */
- ret = lttng_userspace_probe_location_serialize(
- ev_ext->probe_location, &payload);
- if (ret < 0) {
- goto mem_error;
- }
-
- /*
- * Set the size of the userspace probe location element
- * of the buffer so that the receiving side knows where
- * to split it.
- */
- lsm.u.enable.userspace_probe_location_len = ret;
- }
- }
-
- {
- struct lttng_payload_view view = lttng_payload_view_from_payload(
- &payload, 0, -1);
- int fd_count = lttng_payload_view_get_fd_handle_count(&view);
- int fd_to_send;
-
- if (fd_count < 0) {
- goto mem_error;
- }
-
- LTTNG_ASSERT(fd_count == 0 || fd_count == 1);
- if (fd_count == 1) {
- struct fd_handle *h =
- lttng_payload_view_pop_fd_handle(&view);
-
- if (!h) {
- goto mem_error;
- }
-
- fd_to_send = fd_handle_get_fd(h);
- fd_handle_put(h);
- }
-
- ret = lttng_ctl_ask_sessiond_fds_varlen(&lsm,
- fd_count ? &fd_to_send : NULL, fd_count,
- view.buffer.size ? view.buffer.data : NULL,
- view.buffer.size, NULL, NULL, 0);
- }
-
-mem_error:
- if (filter_expression && ctx) {
- filter_bytecode_free(ctx);
- filter_ir_free(ctx);
- filter_parser_ctx_free(ctx);
- }
-filter_error:
- if (free_filter_expression) {
- /*
- * The filter expression has been replaced and must be freed as
- * it is not the original filter expression received as a
- * parameter.
- */
- free(filter_expression);
- }
-error:
- /*
- * Return directly to the caller and don't ask the sessiond since
- * something went wrong in the parsing of data above.
- */
- lttng_payload_reset(&payload);
- return ret;
-
-ask_sessiond:
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
- return ret;
-}
-
-int lttng_disable_event_ext(struct lttng_handle *handle,
- struct lttng_event *ev, const char *channel_name,
- const char *original_filter_expression)
-{
- struct lttcomm_session_msg lsm;
- char *varlen_data;
- int ret = 0;
- unsigned int free_filter_expression = 0;
- struct filter_parser_ctx *ctx = NULL;
- /*
- * Cast as non-const since we may replace the filter expression
- * by a dynamically allocated string. Otherwise, the original
- * string is not modified.
- */
- char *filter_expression = (char *) original_filter_expression;
-
- if (handle == NULL || ev == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- /*
- * Empty filter string will always be rejected by the parser
- * anyway, so treat this corner-case early to eliminate
- * lttng_fmemopen error for 0-byte allocation.
- */
- if (filter_expression && filter_expression[0] == '\0') {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- memset(&lsm, 0, sizeof(lsm));
-
- /* If no channel name, send empty string. */
- ret = lttng_strncpy(lsm.u.disable.channel_name, channel_name ?: "",
- sizeof(lsm.u.disable.channel_name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- lsm.cmd_type = LTTNG_DISABLE_EVENT;
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
- memcpy(&lsm.u.disable.event, ev, sizeof(lsm.u.disable.event));
-
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- lsm.u.disable.bytecode_len = 0;
-
- /*
- * For the JUL domain, a filter is enforced except for the
- * disable all event. This is done to avoid having the event in
- * all sessions thus filtering by logger name.
- */
- if (filter_expression == NULL &&
- (handle->domain.type != LTTNG_DOMAIN_JUL &&
- handle->domain.type != LTTNG_DOMAIN_LOG4J &&
- handle->domain.type != LTTNG_DOMAIN_PYTHON)) {
- goto ask_sessiond;
- }
-
- /*
- * We have a filter, so we need to set up a variable-length
- * memory block from where to send the data.
- */
-
- /* Parse filter expression */
- if (filter_expression != NULL || handle->domain.type == LTTNG_DOMAIN_JUL
- || handle->domain.type == LTTNG_DOMAIN_LOG4J
- || handle->domain.type == LTTNG_DOMAIN_PYTHON) {
- if (handle->domain.type == LTTNG_DOMAIN_JUL ||
- handle->domain.type == LTTNG_DOMAIN_LOG4J ||
- handle->domain.type == LTTNG_DOMAIN_PYTHON) {
- char *agent_filter;
-
- /* Setup JUL filter if needed. */
- agent_filter = set_agent_filter(filter_expression, ev);
- if (!agent_filter) {
- if (!filter_expression) {
- /*
- * No JUL and no filter, just skip
- * everything below.
- */
- goto ask_sessiond;
- }
- } else {
- /*
- * With a JUL filter, the original filter has
- * been added to it thus replace the filter
- * expression.
- */
- filter_expression = agent_filter;
- free_filter_expression = 1;
- }
- }
-
- ret = filter_parser_ctx_create_from_filter_expression(filter_expression, &ctx);
- if (ret) {
- goto filter_error;
- }
-
- lsm.u.enable.bytecode_len = sizeof(ctx->bytecode->b)
- + bytecode_get_len(&ctx->bytecode->b);
- lsm.u.enable.expression_len = strlen(filter_expression) + 1;
- }
-
- varlen_data = zmalloc(lsm.u.disable.bytecode_len
- + lsm.u.disable.expression_len);
- if (!varlen_data) {
- ret = -LTTNG_ERR_EXCLUSION_NOMEM;
- goto mem_error;
- }
-
- /* Add filter expression. */
- if (lsm.u.disable.expression_len != 0) {
- memcpy(varlen_data,
- filter_expression,
- lsm.u.disable.expression_len);
- }
- /* Add filter bytecode next. */
- if (ctx && lsm.u.disable.bytecode_len != 0) {
- memcpy(varlen_data
- + lsm.u.disable.expression_len,
- &ctx->bytecode->b,
- lsm.u.disable.bytecode_len);
- }
-
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, varlen_data,
- lsm.u.disable.bytecode_len + lsm.u.disable.expression_len, NULL);
- free(varlen_data);
-
-mem_error:
- if (filter_expression && ctx) {
- filter_bytecode_free(ctx);
- filter_ir_free(ctx);
- filter_parser_ctx_free(ctx);
- }
-filter_error:
- if (free_filter_expression) {
- /*
- * The filter expression has been replaced and must be freed as
- * it is not the original filter expression received as a
- * parameter.
- */
- free(filter_expression);
- }
-error:
- /*
- * Return directly to the caller and don't ask the sessiond since
- * something went wrong in the parsing of data above.
- */
- return ret;
-
-ask_sessiond:
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
- return ret;
-}
-
-/*
- * Disable event(s) of a channel and domain.
- * If no event name is specified, all events are disabled.
- * If no channel name is specified, the default 'channel0' is used.
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_disable_event(struct lttng_handle *handle, const char *name,
- const char *channel_name)
-{
- int ret;
- struct lttng_event ev;
-
- memset(&ev, 0, sizeof(ev));
- ev.loglevel = -1;
- ev.type = LTTNG_EVENT_ALL;
- ret = lttng_strncpy(ev.name, name ?: "", sizeof(ev.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_disable_event_ext(handle, &ev, channel_name, NULL);
-end:
- return ret;
-}
-
-struct lttng_channel *lttng_channel_create(struct lttng_domain *domain)
-{
- struct lttng_channel *channel = NULL;
- struct lttng_channel_extended *extended = NULL;
-
- if (!domain) {
- goto error;
- }
-
- /* Validate domain. */
- switch (domain->type) {
- case LTTNG_DOMAIN_UST:
- switch (domain->buf_type) {
- case LTTNG_BUFFER_PER_UID:
- case LTTNG_BUFFER_PER_PID:
- break;
- default:
- goto error;
- }
- break;
- case LTTNG_DOMAIN_KERNEL:
- if (domain->buf_type != LTTNG_BUFFER_GLOBAL) {
- goto error;
- }
- break;
- default:
- goto error;
- }
-
- channel = zmalloc(sizeof(*channel));
- if (!channel) {
- goto error;
- }
-
- extended = zmalloc(sizeof(*extended));
- if (!extended) {
- goto error;
- }
-
- channel->attr.extended.ptr = extended;
-
- lttng_channel_set_default_attr(domain, &channel->attr);
- return channel;
-error:
- free(channel);
- free(extended);
- return NULL;
-}
-
-void lttng_channel_destroy(struct lttng_channel *channel)
-{
- if (!channel) {
- return;
- }
-
- if (channel->attr.extended.ptr) {
- free(channel->attr.extended.ptr);
- }
- free(channel);
-}
-
-/*
- * Enable channel per domain
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_enable_channel(struct lttng_handle *handle,
- struct lttng_channel *in_chan)
-{
- int ret;
- struct lttcomm_session_msg lsm;
- size_t total_buffer_size_needed_per_cpu = 0;
-
- /* NULL arguments are forbidden. No default values. */
- if (handle == NULL || in_chan == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- memcpy(&lsm.u.channel.chan, in_chan, sizeof(lsm.u.channel.chan));
- lsm.u.channel.chan.attr.extended.ptr = NULL;
-
- if (!in_chan->attr.extended.ptr) {
- struct lttng_channel *channel;
- struct lttng_channel_extended *extended;
-
- channel = lttng_channel_create(&handle->domain);
- if (!channel) {
- return -LTTNG_ERR_NOMEM;
- }
-
- /*
- * Create a new channel in order to use default extended
- * attribute values.
- */
- extended = (struct lttng_channel_extended *)
- channel->attr.extended.ptr;
- memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
- lttng_channel_destroy(channel);
- } else {
- struct lttng_channel_extended *extended;
-
- extended = (struct lttng_channel_extended *)
- in_chan->attr.extended.ptr;
- memcpy(&lsm.u.channel.extended, extended, sizeof(*extended));
- }
-
- /*
- * Verify that the amount of memory required to create the requested
- * buffer is available on the system at the moment.
- */
- total_buffer_size_needed_per_cpu = lsm.u.channel.chan.attr.num_subbuf *
- lsm.u.channel.chan.attr.subbuf_size;
- if (!check_enough_available_memory(total_buffer_size_needed_per_cpu)) {
- return -LTTNG_ERR_NOMEM;
- }
-
- lsm.cmd_type = LTTNG_ENABLE_CHANNEL;
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-end:
- return ret;
-}
-
-/*
- * All tracing will be stopped for registered events of the channel.
- * Returns size of returned session payload data or a negative error code.
- */
-int lttng_disable_channel(struct lttng_handle *handle, const char *name)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- /* Safety check. Both are mandatory. */
- if (handle == NULL || name == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
-
- lsm.cmd_type = LTTNG_DISABLE_CHANNEL;
-
- ret = lttng_strncpy(lsm.u.disable.channel_name, name,
- sizeof(lsm.u.disable.channel_name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-end:
- return ret;
-}
-
-/*
- * Lists all available tracepoints of domain.
- * Sets the contents of the events array.
- * Returns the number of lttng_event entries in events;
- * on error, returns a negative value.
- */
-int lttng_list_tracepoints(struct lttng_handle *handle,
- struct lttng_event **events)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_LIST_TRACEPOINTS;
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
- if (ret < 0) {
- return ret;
- }
-
- return ret / sizeof(struct lttng_event);
-}
-
-/*
- * Lists all available tracepoint fields of domain.
- * Sets the contents of the event field array.
- * Returns the number of lttng_event_field entries in events;
- * on error, returns a negative value.
- */
-int lttng_list_tracepoint_fields(struct lttng_handle *handle,
- struct lttng_event_field **fields)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (handle == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_LIST_TRACEPOINT_FIELDS;
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_ctl_ask_sessiond(&lsm, (void **) fields);
- if (ret < 0) {
- return ret;
- }
-
- return ret / sizeof(struct lttng_event_field);
-}
-
-/*
- * Lists all available kernel system calls. Allocates and sets the contents of
- * the events array.
- *
- * Returns the number of lttng_event entries in events; on error, returns a
- * negative value.
- */
-int lttng_list_syscalls(struct lttng_event **events)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (!events) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_LIST_SYSCALLS;
- /* Force kernel domain for system calls. */
- lsm.domain.type = LTTNG_DOMAIN_KERNEL;
-
- ret = lttng_ctl_ask_sessiond(&lsm, (void **) events);
- if (ret < 0) {
- return ret;
- }
-
- return ret / sizeof(struct lttng_event);
-}
-
-/*
- * Returns a human readable string describing
- * the error code (a negative value).
- */
-const char *lttng_strerror(int code)
-{
- return error_get_str(code);
-}
-
-enum lttng_error_code lttng_create_session_ext(
- struct lttng_session_descriptor *session_descriptor)
-{
- enum lttng_error_code ret_code;
- struct lttcomm_session_msg lsm = {
- .cmd_type = LTTNG_CREATE_SESSION_EXT,
- };
- void *reply = NULL;
- struct lttng_buffer_view reply_view;
- int reply_ret;
- bool sessiond_must_generate_ouput;
- struct lttng_dynamic_buffer payload;
- int ret;
- size_t descriptor_size;
- struct lttng_session_descriptor *descriptor_reply = NULL;
-
- lttng_dynamic_buffer_init(&payload);
- if (!session_descriptor) {
- ret_code = LTTNG_ERR_INVALID;
- goto end;
- }
-
- sessiond_must_generate_ouput =
- !lttng_session_descriptor_is_output_destination_initialized(
- session_descriptor);
- if (sessiond_must_generate_ouput) {
- const char *home_dir = utils_get_home_dir();
- size_t home_dir_len = home_dir ? strlen(home_dir) + 1 : 0;
-
- if (!home_dir || home_dir_len > LTTNG_PATH_MAX) {
- ret_code = LTTNG_ERR_FATAL;
- goto end;
- }
-
- lsm.u.create_session.home_dir_size = (uint16_t) home_dir_len;
- ret = lttng_dynamic_buffer_append(&payload, home_dir,
- home_dir_len);
- if (ret) {
- ret_code = LTTNG_ERR_NOMEM;
- goto end;
- }
- }
-
- descriptor_size = payload.size;
- ret = lttng_session_descriptor_serialize(session_descriptor,
- &payload);
- if (ret) {
- ret_code = LTTNG_ERR_INVALID;
- goto end;
- }
- descriptor_size = payload.size - descriptor_size;
- lsm.u.create_session.session_descriptor_size = descriptor_size;
-
- /* Command returns a session descriptor on success. */
- reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, payload.data,
- payload.size, &reply);
- if (reply_ret < 0) {
- ret_code = -reply_ret;
- goto end;
- } else if (reply_ret == 0) {
- /* Socket unexpectedly closed by the session daemon. */
- ret_code = LTTNG_ERR_FATAL;
- goto end;
- }
-
- reply_view = lttng_buffer_view_init(reply, 0, reply_ret);
- ret = lttng_session_descriptor_create_from_buffer(&reply_view,
- &descriptor_reply);
- if (ret < 0) {
- ret_code = LTTNG_ERR_FATAL;
- goto end;
- }
- ret_code = LTTNG_OK;
- lttng_session_descriptor_assign(session_descriptor, descriptor_reply);
-end:
- free(reply);
- lttng_dynamic_buffer_reset(&payload);
- lttng_session_descriptor_destroy(descriptor_reply);
- return ret_code;
-}
-
-/*
- * Create a new session using name and url for destination.
- *
- * Return 0 on success else a negative LTTng error code.
- */
-int lttng_create_session(const char *name, const char *url)
-{
- int ret;
- ssize_t size;
- struct lttng_uri *uris = NULL;
- struct lttng_session_descriptor *descriptor = NULL;
- enum lttng_error_code ret_code;
-
- if (!name) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- size = uri_parse_str_urls(url, NULL, &uris);
- if (size < 0) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- switch (size) {
- case 0:
- descriptor = lttng_session_descriptor_create(name);
- break;
- case 1:
- if (uris[0].dtype != LTTNG_DST_PATH) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- descriptor = lttng_session_descriptor_local_create(name,
- uris[0].dst.path);
- break;
- case 2:
- descriptor = lttng_session_descriptor_network_create(name, url,
- NULL);
- break;
- default:
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- if (!descriptor) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- ret_code = lttng_create_session_ext(descriptor);
- ret = ret_code == LTTNG_OK ? 0 : -ret_code;
-end:
- lttng_session_descriptor_destroy(descriptor);
- free(uris);
- return ret;
-}
-
-/*
- * Create a session exclusively used for snapshot.
- *
- * Return 0 on success else a negative LTTng error code.
- */
-int lttng_create_session_snapshot(const char *name, const char *snapshot_url)
-{
- int ret;
- enum lttng_error_code ret_code;
- ssize_t size;
- struct lttng_uri *uris = NULL;
- struct lttng_session_descriptor *descriptor = NULL;
-
- if (!name) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- size = uri_parse_str_urls(snapshot_url, NULL, &uris);
- if (size < 0) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- /*
- * If the user does not specify a custom subdir, use the session name.
- */
- if (size > 0 && uris[0].dtype != LTTNG_DST_PATH &&
- strlen(uris[0].subdir) == 0) {
- ret = snprintf(uris[0].subdir, sizeof(uris[0].subdir), "%s",
- name);
- if (ret < 0) {
- PERROR("Failed to set session name as network destination sub-directory");
- ret = -LTTNG_ERR_FATAL;
- goto end;
- } else if (ret >= sizeof(uris[0].subdir)) {
- /* Truncated output. */
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- }
-
- switch (size) {
- case 0:
- descriptor = lttng_session_descriptor_snapshot_create(name);
- break;
- case 1:
- if (uris[0].dtype != LTTNG_DST_PATH) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- descriptor = lttng_session_descriptor_snapshot_local_create(
- name,
- uris[0].dst.path);
- break;
- case 2:
- descriptor = lttng_session_descriptor_snapshot_network_create(
- name,
- snapshot_url,
- NULL);
- break;
- default:
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- if (!descriptor) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- ret_code = lttng_create_session_ext(descriptor);
- ret = ret_code == LTTNG_OK ? 0 : -ret_code;
-end:
- lttng_session_descriptor_destroy(descriptor);
- free(uris);
- return ret;
-}
-
-/*
- * Create a session exclusively used for live.
- *
- * Return 0 on success else a negative LTTng error code.
- */
-int lttng_create_session_live(const char *name, const char *url,
- unsigned int timer_interval)
-{
- int ret;
- enum lttng_error_code ret_code;
- struct lttng_session_descriptor *descriptor = NULL;
-
- if (!name) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (url) {
- descriptor = lttng_session_descriptor_live_network_create(
- name, url, NULL, timer_interval);
- } else {
- descriptor = lttng_session_descriptor_live_create(
- name, timer_interval);
- }
- if (!descriptor) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
- ret_code = lttng_create_session_ext(descriptor);
- ret = ret_code == LTTNG_OK ? 0 : -ret_code;
-end:
- lttng_session_descriptor_destroy(descriptor);
- return ret;
-}
-
-/*
- * Stop the session and wait for the data before destroying it
- *
- * Return 0 on success else a negative LTTng error code.
- */
-int lttng_destroy_session(const char *session_name)
-{
- int ret;
- enum lttng_error_code ret_code;
- enum lttng_destruction_handle_status status;
- struct lttng_destruction_handle *handle = NULL;
-
- /*
- * Stop the tracing and wait for the data to be
- * consumed.
- */
- ret = _lttng_stop_tracing(session_name, 1);
- if (ret && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
- goto end;
- }
-
- ret_code = lttng_destroy_session_ext(session_name, &handle);
- if (ret_code != LTTNG_OK) {
- ret = (int) -ret_code;
- goto end;
- }
- LTTNG_ASSERT(handle);
-
- /* Block until the completion of the destruction of the session. */
- status = lttng_destruction_handle_wait_for_completion(handle, -1);
- if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED) {
- ret = -LTTNG_ERR_UNK;
- goto end;
- }
-
- status = lttng_destruction_handle_get_result(handle, &ret_code);
- if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
- ret = -LTTNG_ERR_UNK;
- goto end;
- }
- ret = ret_code == LTTNG_OK ? 0 : -ret_code;
-end:
- lttng_destruction_handle_destroy(handle);
- return ret;
-}
-
-/*
- * Destroy the session without waiting for the data.
- */
-int lttng_destroy_session_no_wait(const char *session_name)
-{
- enum lttng_error_code ret_code;
-
- ret_code = lttng_destroy_session_ext(session_name, NULL);
- return ret_code == LTTNG_OK ? 0 : -ret_code;
-}
-
-/*
- * Ask the session daemon for all available sessions.
- * Sets the contents of the sessions array.
- * Returns the number of lttng_session entries in sessions;
- * on error, returns a negative value.
- */
-int lttng_list_sessions(struct lttng_session **out_sessions)
-{
- int ret;
- struct lttcomm_session_msg lsm;
- const size_t session_size = sizeof(struct lttng_session) +
- sizeof(struct lttng_session_extended);
- size_t session_count, i;
- struct lttng_session_extended *sessions_extended_begin;
- struct lttng_session *sessions = NULL;
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_LIST_SESSIONS;
- ret = lttng_ctl_ask_sessiond(&lsm, (void**) &sessions);
- if (ret <= 0) {
- goto end;
- }
- if (!sessions) {
- ret = -LTTNG_ERR_FATAL;
- goto end;
- }
-
- if (ret % session_size) {
- ret = -LTTNG_ERR_UNK;
- free(sessions);
- *out_sessions = NULL;
- goto end;
- }
- session_count = (size_t) ret / session_size;
- sessions_extended_begin = (struct lttng_session_extended *)
- (&sessions[session_count]);
-
- /* Set extended session info pointers. */
- for (i = 0; i < session_count; i++) {
- struct lttng_session *session = &sessions[i];
- struct lttng_session_extended *extended =
- &(sessions_extended_begin[i]);
-
- session->extended.ptr = extended;
- }
-
- ret = (int) session_count;
- *out_sessions = sessions;
-end:
- return ret;
-}
-
-enum lttng_error_code lttng_session_get_creation_time(
- const struct lttng_session *session, uint64_t *creation_time)
-{
- enum lttng_error_code ret = LTTNG_OK;
- struct lttng_session_extended *extended;
-
- if (!session || !creation_time || !session->extended.ptr) {
- ret = LTTNG_ERR_INVALID;
- goto end;
- }
-
- extended = session->extended.ptr;
- if (!extended->creation_time.is_set) {
- /* Not created on the session daemon yet. */
- ret = LTTNG_ERR_SESSION_NOT_EXIST;
- goto end;
- }
- *creation_time = extended->creation_time.value;
-end:
- return ret;
-}
-
-int lttng_set_session_shm_path(const char *session_name,
- const char *shm_path)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_SET_SESSION_SHM_PATH;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_strncpy(lsm.u.set_shm_path.shm_path, shm_path ?: "",
- sizeof(lsm.u.set_shm_path.shm_path));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
-end:
- return ret;
-}
-
-/*
- * Ask the session daemon for all available domains of a session.
- * Sets the contents of the domains array.
- * Returns the number of lttng_domain entries in domains;
- * on error, returns a negative value.
- */
-int lttng_list_domains(const char *session_name,
- struct lttng_domain **domains)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (session_name == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_LIST_DOMAINS;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, (void**) domains);
- if (ret < 0) {
- goto error;
- }
-
- return ret / sizeof(struct lttng_domain);
-error:
- return ret;
-}
-
-/*
- * Ask the session daemon for all available channels of a session.
- * Sets the contents of the channels array.
- * Returns the number of lttng_channel entries in channels;
- * on error, returns a negative value.
- */
-int lttng_list_channels(struct lttng_handle *handle,
- struct lttng_channel **channels)
-{
- int ret;
- size_t channel_count, i;
- const size_t channel_size = sizeof(struct lttng_channel) +
- sizeof(struct lttng_channel_extended);
- struct lttcomm_session_msg lsm;
- void *extended_at;
-
- if (handle == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_LIST_CHANNELS;
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_ctl_ask_sessiond(&lsm, (void**) channels);
- if (ret < 0) {
- goto end;
- }
-
- if (ret % channel_size) {
- ret = -LTTNG_ERR_UNK;
- free(*channels);
- *channels = NULL;
- goto end;
- }
- channel_count = (size_t) ret / channel_size;
-
- /* Set extended info pointers */
- extended_at = ((void *) *channels) +
- channel_count * sizeof(struct lttng_channel);
- for (i = 0; i < channel_count; i++) {
- struct lttng_channel *chan = &(*channels)[i];
-
- chan->attr.extended.ptr = extended_at;
- extended_at += sizeof(struct lttng_channel_extended);
- }
-
- ret = (int) channel_count;
-end:
- return ret;
-}
-
-/*
- * Ask the session daemon for all available events of a session channel.
- * Sets the contents of the events array.
- * Returns the number of lttng_event entries in events;
- * on error, returns a negative value.
- */
-int lttng_list_events(struct lttng_handle *handle,
- const char *channel_name, struct lttng_event **events)
-{
- int ret;
- struct lttcomm_session_msg lsm = {};
- const struct lttcomm_event_command_header *cmd_header = NULL;
- uint32_t nb_events, i;
- const void *comm_ext_at;
- struct lttng_dynamic_buffer listing;
- size_t storage_req;
- struct lttng_payload payload;
- struct lttng_payload payload_copy;
- struct lttng_payload_view lsm_view =
- lttng_payload_view_init_from_buffer(
- (const char *) &lsm, 0, sizeof(lsm));
- struct lttng_buffer_view cmd_header_view;
- struct lttng_buffer_view cmd_payload_view;
- struct lttng_buffer_view flat_events_view;
- struct lttng_buffer_view ext_view;
-
- /* Safety check. An handle and channel name are mandatory */
- if (handle == NULL || channel_name == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- lttng_payload_init(&payload);
- lttng_payload_init(&payload_copy);
-
- lsm.cmd_type = LTTNG_LIST_EVENTS;
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_strncpy(lsm.u.list.channel_name, channel_name,
- sizeof(lsm.u.list.channel_name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &payload);
- if (ret < 0) {
- goto end;
- }
-
- /*
- * A copy of the payload is performed since it will be
- * consumed twice. Consuming the same payload twice is invalid since
- * it will cause any received file descriptor to become "shared"
- * between different instances of the resulting objects.
- */
- ret = lttng_payload_copy(&payload, &payload_copy);
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
-
- cmd_header_view = lttng_buffer_view_from_dynamic_buffer(
- &payload.buffer, 0, sizeof(*cmd_header));
- if (!lttng_buffer_view_is_valid(&cmd_header_view)) {
- ret = -LTTNG_ERR_INVALID_PROTOCOL;
- goto end;
- }
-
- cmd_header = (typeof(cmd_header)) cmd_header_view.data;
-
- /* Set number of events and free command header */
- nb_events = cmd_header->nb_events;
- if (nb_events > INT_MAX) {
- ret = -LTTNG_ERR_OVERFLOW;
- goto end;
- }
-
- cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
- &payload.buffer, sizeof(*cmd_header), -1);
-
- /*
- * The buffer that is returned must contain a "flat" version of
- * the events that are returned. In other words, all pointers
- * within an lttng_event must point to a location within the returned
- * buffer so that the user may free everything by simply calling free()
- * on the returned buffer. This is needed in order to maintain API
- * compatibility.
- *
- * A first pass is performed to compute the size of the buffer that
- * must be allocated. A second pass is then performed to setup
- * the returned events so that their members always point within the
- * buffer.
- *
- * The layout of the returned buffer is as follows:
- * - struct lttng_event[nb_events],
- * - nb_events times the following:
- * - struct lttng_event_extended,
- * - flattened version of userspace_probe_location
- * - filter_expression
- * - exclusions
- * - padding to align to 64-bits
- */
- ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
- nb_events * sizeof(struct lttng_event), -1);
- comm_ext_at = ext_view.data;
- storage_req = nb_events * sizeof(struct lttng_event);
- {
- struct lttng_payload_view payload_view =
- lttng_payload_view_from_payload(&payload, 0, -1);
-
- for (i = 0; i < nb_events; i++) {
- const struct lttcomm_event_extended_header *ext_comm =
- (struct lttcomm_event_extended_header *)
- comm_ext_at;
- int probe_storage_req = 0;
-
- comm_ext_at += sizeof(*ext_comm);
- comm_ext_at += ext_comm->filter_len;
- comm_ext_at += ext_comm->nb_exclusions *
- LTTNG_SYMBOL_NAME_LEN;
-
- if (ext_comm->userspace_probe_location_len) {
- struct lttng_userspace_probe_location
- *probe_location = NULL;
- struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
- &payload_view,
- (const char *) comm_ext_at -
- payload_view.buffer.data,
- ext_comm->userspace_probe_location_len);
-
- if (!lttng_payload_view_is_valid(&probe_location_view)) {
- ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto end;
- }
-
- /*
- * Create a temporary userspace probe location
- * to determine the size needed by a "flattened"
- * version of that same probe location.
- */
- ret = lttng_userspace_probe_location_create_from_payload(
- &probe_location_view,
- &probe_location);
- if (ret < 0) {
- ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto end;
- }
-
- ret = lttng_userspace_probe_location_flatten(
- probe_location, NULL);
- lttng_userspace_probe_location_destroy(
- probe_location);
- if (ret < 0) {
- ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto end;
- }
-
- probe_storage_req = ret;
- comm_ext_at += ext_comm->userspace_probe_location_len;
- }
-
- storage_req += sizeof(struct lttng_event_extended);
- storage_req += ext_comm->filter_len;
- storage_req += ext_comm->nb_exclusions *
- LTTNG_SYMBOL_NAME_LEN;
- /* Padding to ensure the flat probe is aligned. */
- storage_req = lttng_align_ceil(storage_req, sizeof(uint64_t));
- storage_req += probe_storage_req;
- }
- }
-
- lttng_dynamic_buffer_init(&listing);
- /*
- * We must ensure that "listing" is never resized so as to preserve
- * the validity of the flattened objects.
- */
- ret = lttng_dynamic_buffer_set_capacity(&listing, storage_req);
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
-
- cmd_payload_view = lttng_buffer_view_from_dynamic_buffer(
- &payload_copy.buffer, sizeof(*cmd_header), -1);
- flat_events_view = lttng_buffer_view_from_view(&cmd_payload_view, 0,
- nb_events * sizeof(struct lttng_event));
- ret = lttng_dynamic_buffer_append_view(&listing, &flat_events_view);
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto free_dynamic_buffer;
- }
-
- ext_view = lttng_buffer_view_from_view(&cmd_payload_view,
- nb_events * sizeof(struct lttng_event), -1);
- comm_ext_at = ext_view.data;
-
- {
- struct lttng_payload_view payload_copy_view =
- lttng_payload_view_from_payload(
- &payload_copy, 0, -1);
-
- for (i = 0; i < nb_events; i++) {
- struct lttng_event *event = (typeof(event))(
- listing.data +
- (sizeof(struct lttng_event) * i));
- const struct lttcomm_event_extended_header *ext_comm =
- (typeof(ext_comm)) comm_ext_at;
- struct lttng_event_extended *event_extended =
- (typeof(event_extended))(listing.data +
- listing.size);
-
- /* Insert struct lttng_event_extended. */
- ret = lttng_dynamic_buffer_set_size(&listing,
- listing.size + sizeof(*event_extended));
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto free_dynamic_buffer;
- }
- event->extended.ptr = event_extended;
-
- comm_ext_at += sizeof(*ext_comm);
-
- /* Insert filter expression. */
- if (ext_comm->filter_len) {
- event_extended->filter_expression =
- listing.data + listing.size;
- ret = lttng_dynamic_buffer_append(&listing,
- comm_ext_at,
- ext_comm->filter_len);
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto free_dynamic_buffer;
- }
- comm_ext_at += ext_comm->filter_len;
- }
-
- /* Insert exclusions. */
- if (ext_comm->nb_exclusions) {
- event_extended->exclusions.count =
- ext_comm->nb_exclusions;
- event_extended->exclusions.strings =
- listing.data + listing.size;
-
- ret = lttng_dynamic_buffer_append(&listing,
- comm_ext_at,
- ext_comm->nb_exclusions *
- LTTNG_SYMBOL_NAME_LEN);
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto free_dynamic_buffer;
- }
- comm_ext_at += ext_comm->nb_exclusions *
- LTTNG_SYMBOL_NAME_LEN;
- }
-
- /* Insert padding to align to 64-bits. */
- ret = lttng_dynamic_buffer_set_size(&listing,
- lttng_align_ceil(listing.size,
- sizeof(uint64_t)));
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto free_dynamic_buffer;
- }
-
- /* Insert flattened userspace probe location. */
- if (ext_comm->userspace_probe_location_len) {
- struct lttng_userspace_probe_location
- *probe_location = NULL;
- struct lttng_payload_view probe_location_view = lttng_payload_view_from_view(
- &payload_copy_view,
- (const char *) comm_ext_at -
- payload_copy_view.buffer.data,
- ext_comm->userspace_probe_location_len);
-
- if (!lttng_payload_view_is_valid(&probe_location_view)) {
- ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto free_dynamic_buffer;
- }
-
- ret = lttng_userspace_probe_location_create_from_payload(
- &probe_location_view,
- &probe_location);
- if (ret < 0) {
- ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto free_dynamic_buffer;
- }
-
- event_extended->probe_location = (struct lttng_userspace_probe_location
- *) (listing.data +
- listing.size);
- ret = lttng_userspace_probe_location_flatten(
- probe_location, &listing);
- lttng_userspace_probe_location_destroy(
- probe_location);
- if (ret < 0) {
- ret = -LTTNG_ERR_PROBE_LOCATION_INVAL;
- goto free_dynamic_buffer;
- }
-
- comm_ext_at += ext_comm->userspace_probe_location_len;
- }
- }
- }
-
- /* Don't reset listing buffer as we return its content. */
- *events = (struct lttng_event *) listing.data;
- lttng_dynamic_buffer_init(&listing);
- ret = (int) nb_events;
-free_dynamic_buffer:
- lttng_dynamic_buffer_reset(&listing);
-end:
- lttng_payload_reset(&payload);
- lttng_payload_reset(&payload_copy);
- return ret;
-}
-
-/*
- * Sets the tracing_group variable with name.
- * This function allocates memory pointed to by tracing_group.
- * On success, returns 0, on error, returns -1 (null name) or -ENOMEM.
- */
-int lttng_set_tracing_group(const char *name)
-{
- int ret = 0;
- char *new_group;
-
- if (name == NULL) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- new_group = strdup(name);
- if (!new_group) {
- ret = -LTTNG_ERR_FATAL;
- goto end;
- }
-
- free(tracing_group);
- tracing_group = new_group;
- new_group = NULL;
-
-end:
- return ret;
-}
-
-int lttng_calibrate(struct lttng_handle *handle,
- struct lttng_calibrate *calibrate)
-{
- /*
- * This command was removed in LTTng 2.9.
- */
- return -LTTNG_ERR_UND;
-}
-
-/*
- * Set default channel attributes.
- * If either or both of the arguments are null, attr content is zeroe'd.
- */
-void lttng_channel_set_default_attr(struct lttng_domain *domain,
- struct lttng_channel_attr *attr)
-{
- struct lttng_channel_extended *extended;
-
- /* Safety check */
- if (attr == NULL || domain == NULL) {
- return;
- }
-
- extended = (struct lttng_channel_extended *) attr->extended.ptr;
- memset(attr, 0, sizeof(struct lttng_channel_attr));
-
- /* Same for all domains. */
- attr->overwrite = DEFAULT_CHANNEL_OVERWRITE;
- attr->tracefile_size = DEFAULT_CHANNEL_TRACEFILE_SIZE;
- attr->tracefile_count = DEFAULT_CHANNEL_TRACEFILE_COUNT;
-
- switch (domain->type) {
- case LTTNG_DOMAIN_KERNEL:
- attr->switch_timer_interval =
- DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval = DEFAULT_KERNEL_CHANNEL_READ_TIMER;
- attr->subbuf_size = default_get_kernel_channel_subbuf_size();
- attr->num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
- attr->output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
- if (extended) {
- extended->monitor_timer_interval =
- DEFAULT_KERNEL_CHANNEL_MONITOR_TIMER;
- extended->blocking_timeout =
- DEFAULT_KERNEL_CHANNEL_BLOCKING_TIMEOUT;
- }
- break;
- case LTTNG_DOMAIN_UST:
- switch (domain->buf_type) {
- case LTTNG_BUFFER_PER_UID:
- attr->subbuf_size = default_get_ust_uid_channel_subbuf_size();
- attr->num_subbuf = DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM;
- attr->output = DEFAULT_UST_UID_CHANNEL_OUTPUT;
- attr->switch_timer_interval =
- DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval =
- DEFAULT_UST_UID_CHANNEL_READ_TIMER;
- if (extended) {
- extended->monitor_timer_interval =
- DEFAULT_UST_UID_CHANNEL_MONITOR_TIMER;
- extended->blocking_timeout =
- DEFAULT_UST_UID_CHANNEL_BLOCKING_TIMEOUT;
- }
- break;
- case LTTNG_BUFFER_PER_PID:
- default:
- attr->subbuf_size = default_get_ust_pid_channel_subbuf_size();
- attr->num_subbuf = DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM;
- attr->output = DEFAULT_UST_PID_CHANNEL_OUTPUT;
- attr->switch_timer_interval =
- DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER;
- attr->read_timer_interval =
- DEFAULT_UST_PID_CHANNEL_READ_TIMER;
- if (extended) {
- extended->monitor_timer_interval =
- DEFAULT_UST_PID_CHANNEL_MONITOR_TIMER;
- extended->blocking_timeout =
- DEFAULT_UST_PID_CHANNEL_BLOCKING_TIMEOUT;
- }
- break;
- }
- default:
- /* Default behavior: leave set to 0. */
- break;
- }
-
- attr->extended.ptr = extended;
-}
-
-int lttng_channel_get_discarded_event_count(struct lttng_channel *channel,
- uint64_t *discarded_events)
-{
- int ret = 0;
- struct lttng_channel_extended *chan_ext;
-
- if (!channel || !discarded_events) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- chan_ext = channel->attr.extended.ptr;
- if (!chan_ext) {
- /*
- * This can happen since the lttng_channel structure is
- * used for other tasks where this pointer is never set.
- */
- *discarded_events = 0;
- goto end;
- }
-
- *discarded_events = chan_ext->discarded_events;
-end:
- return ret;
-}
-
-int lttng_channel_get_lost_packet_count(struct lttng_channel *channel,
- uint64_t *lost_packets)
-{
- int ret = 0;
- struct lttng_channel_extended *chan_ext;
-
- if (!channel || !lost_packets) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- chan_ext = channel->attr.extended.ptr;
- if (!chan_ext) {
- /*
- * This can happen since the lttng_channel structure is
- * used for other tasks where this pointer is never set.
- */
- *lost_packets = 0;
- goto end;
- }
-
- *lost_packets = chan_ext->lost_packets;
-end:
- return ret;
-}
-
-int lttng_channel_get_monitor_timer_interval(struct lttng_channel *chan,
- uint64_t *monitor_timer_interval)
-{
- int ret = 0;
-
- if (!chan || !monitor_timer_interval) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (!chan->attr.extended.ptr) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- *monitor_timer_interval = ((struct lttng_channel_extended *)
- chan->attr.extended.ptr)->monitor_timer_interval;
-end:
- return ret;
-}
-
-int lttng_channel_set_monitor_timer_interval(struct lttng_channel *chan,
- uint64_t monitor_timer_interval)
-{
- int ret = 0;
-
- if (!chan || !chan->attr.extended.ptr) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ((struct lttng_channel_extended *)
- chan->attr.extended.ptr)->monitor_timer_interval =
- monitor_timer_interval;
-end:
- return ret;
-}
-
-int lttng_channel_get_blocking_timeout(struct lttng_channel *chan,
- int64_t *blocking_timeout)
-{
- int ret = 0;
-
- if (!chan || !blocking_timeout) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (!chan->attr.extended.ptr) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- *blocking_timeout = ((struct lttng_channel_extended *)
- chan->attr.extended.ptr)->blocking_timeout;
-end:
- return ret;
-}
-
-int lttng_channel_set_blocking_timeout(struct lttng_channel *chan,
- int64_t blocking_timeout)
-{
- int ret = 0;
- int64_t msec_timeout;
-
- if (!chan || !chan->attr.extended.ptr) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (blocking_timeout < 0 && blocking_timeout != -1) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- /*
- * LTTng-ust's use of poll() to implement this timeout mechanism forces
- * us to accept a narrower range of values (msecs expressed as a signed
- * 32-bit integer).
- */
- msec_timeout = blocking_timeout / 1000;
- if (msec_timeout != (int32_t) msec_timeout) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ((struct lttng_channel_extended *)
- chan->attr.extended.ptr)->blocking_timeout =
- blocking_timeout;
-end:
- return ret;
-}
-
-/*
- * Check if session daemon is alive.
- *
- * Return 1 if alive or 0 if not.
- * On error returns a negative value.
- */
-int lttng_session_daemon_alive(void)
-{
- int ret;
-
- ret = set_session_daemon_path();
- if (ret < 0) {
- /* Error. */
- return ret;
- }
-
- if (*sessiond_sock_path == '\0') {
- /*
- * No socket path set. Weird error which means the constructor
- * was not called.
- */
- abort();
- }
-
- ret = try_connect_sessiond(sessiond_sock_path);
- if (ret < 0) {
- /* Not alive. */
- return 0;
- }
-
- /* Is alive. */
- return 1;
-}
-
-/*
- * Set URL for a consumer for a session and domain.
- *
- * Return 0 on success, else a negative value.
- */
-int lttng_set_consumer_url(struct lttng_handle *handle,
- const char *control_url, const char *data_url)
-{
- int ret;
- ssize_t size;
- struct lttcomm_session_msg lsm;
- struct lttng_uri *uris = NULL;
-
- if (handle == NULL || (control_url == NULL && data_url == NULL)) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- memset(&lsm, 0, sizeof(lsm));
-
- lsm.cmd_type = LTTNG_SET_CONSUMER_URI;
-
- ret = lttng_strncpy(lsm.session.name, handle->session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- COPY_DOMAIN_PACKED(lsm.domain, handle->domain);
-
- size = uri_parse_str_urls(control_url, data_url, &uris);
- if (size < 0) {
- ret = -LTTNG_ERR_INVALID;
- goto error;
- }
-
- lsm.u.uri.size = size;
-
- ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header(&lsm, uris,
- sizeof(struct lttng_uri) * size, NULL);
-
- free(uris);
-error:
- return ret;
-}
-
-/*
- * [OBSOLETE]
- */
-int lttng_enable_consumer(struct lttng_handle *handle);
-int lttng_enable_consumer(struct lttng_handle *handle)
-{
- return -ENOSYS;
-}
-
-/*
- * [OBSOLETE]
- */
-int lttng_disable_consumer(struct lttng_handle *handle);
-int lttng_disable_consumer(struct lttng_handle *handle)
-{
- return -ENOSYS;
-}
-
-/*
- * [OBSOLETE]
- */
-int _lttng_create_session_ext(const char *name, const char *url,
- const char *datetime);
-int _lttng_create_session_ext(const char *name, const char *url,
- const char *datetime)
-{
- return -ENOSYS;
-}
-
-/*
- * For a given session name, this call checks if the data is ready to be read
- * or is still being extracted by the consumer(s) hence not ready to be used by
- * any readers.
- */
-int lttng_data_pending(const char *session_name)
-{
- int ret;
- struct lttcomm_session_msg lsm;
- uint8_t *pending = NULL;
-
- if (session_name == NULL) {
- return -LTTNG_ERR_INVALID;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_DATA_PENDING;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, (void **) &pending);
- if (ret < 0) {
- goto end;
- } else if (ret != 1) {
- /* Unexpected payload size */
- ret = -LTTNG_ERR_INVALID;
- goto end;
- } else if (!pending) {
- /* Internal error. */
- ret = -LTTNG_ERR_UNK;
- goto end;
- }
-
- ret = (int) *pending;
-end:
- free(pending);
- return ret;
-}
-
-/*
- * Regenerate the metadata for a session.
- * Return 0 on success, a negative error code on error.
- */
-int lttng_regenerate_metadata(const char *session_name)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (!session_name) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_REGENERATE_METADATA;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
- if (ret < 0) {
- goto end;
- }
-
- ret = 0;
-end:
- return ret;
-}
-
-/*
- * Deprecated, replaced by lttng_regenerate_metadata.
- */
-int lttng_metadata_regenerate(const char *session_name)
-{
- return lttng_regenerate_metadata(session_name);
-}
-
-/*
- * Regenerate the statedump of a session.
- * Return 0 on success, a negative error code on error.
- */
-int lttng_regenerate_statedump(const char *session_name)
-{
- int ret;
- struct lttcomm_session_msg lsm;
-
- if (!session_name) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_REGENERATE_STATEDUMP;
-
- ret = lttng_strncpy(lsm.session.name, session_name,
- sizeof(lsm.session.name));
- if (ret) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- ret = lttng_ctl_ask_sessiond(&lsm, NULL);
- if (ret < 0) {
- goto end;
- }
-
- ret = 0;
-end:
- return ret;
-}
-
-static
-int _lttng_register_trigger(struct lttng_trigger *trigger, const char *name,
- bool generate_name)
-{
- int ret;
- struct lttcomm_session_msg lsm = {
- .cmd_type = LTTNG_REGISTER_TRIGGER,
- .u.trigger.is_trigger_anonymous = !name && !generate_name,
- };
- struct lttcomm_session_msg *message_lsm;
- struct lttng_payload message;
- struct lttng_payload reply;
- struct lttng_trigger *reply_trigger = NULL;
- enum lttng_domain_type domain_type;
- const struct lttng_credentials user_creds = {
- .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
- .gid = LTTNG_OPTIONAL_INIT_UNSET,
- };
- const char *unused_trigger_name = NULL;
- enum lttng_trigger_status trigger_status;
-
- lttng_payload_init(&message);
- lttng_payload_init(&reply);
-
- if (!trigger) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- trigger_status = lttng_trigger_get_name(trigger, &unused_trigger_name);
- if (trigger_status != LTTNG_TRIGGER_STATUS_UNSET) {
- /* Re-using already registered trigger. */
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (name) {
- trigger_status = lttng_trigger_set_name(trigger, name);
- if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
- }
-
- if (!trigger->creds.uid.is_set) {
- /* Use the client's credentials as the trigger credentials. */
- lttng_trigger_set_credentials(trigger, &user_creds);
- } else {
- /*
- * Validate that either the current trigger credentials and the
- * client credentials are identical or that the current user is
- * root. The root user can register, unregister triggers for
- * himself and other users.
- *
- * This check is also present on the sessiond side, using the
- * credentials passed on the socket. These check are all
- * "safety" checks.
- */
- const struct lttng_credentials *trigger_creds =
- lttng_trigger_get_credentials(trigger);
-
- if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
- if (lttng_credentials_get_uid(&user_creds) != 0) {
- ret = -LTTNG_ERR_EPERM;
- goto end_unset_name;
- }
- }
- }
-
- if (!lttng_trigger_validate(trigger)) {
- ret = -LTTNG_ERR_INVALID_TRIGGER;
- goto end_unset_name;
- }
-
- domain_type = lttng_trigger_get_underlying_domain_type_restriction(
- trigger);
-
- lsm.domain.type = domain_type;
-
- ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto end_unset_name;
- }
-
- ret = lttng_trigger_serialize(trigger, &message);
- if (ret < 0) {
- ret = -LTTNG_ERR_UNK;
- goto end_unset_name;
- }
-
- /*
- * This is needed to populate the trigger object size for the command
- * header.
- */
- message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
-
- message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
-
- {
- struct lttng_payload_view message_view =
- lttng_payload_view_from_payload(
- &message, 0, -1);
-
- message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
- &message_view);
- ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
- if (ret < 0) {
- goto end_unset_name;
- }
- }
-
- {
- struct lttng_payload_view reply_view =
- lttng_payload_view_from_payload(
- &reply, 0, reply.buffer.size);
-
- ret = lttng_trigger_create_from_payload(
- &reply_view, &reply_trigger);
- if (ret < 0) {
- ret = -LTTNG_ERR_INVALID_PROTOCOL;
- goto end_unset_name;
- }
- }
-
- if (name || generate_name) {
- ret = lttng_trigger_assign_name(trigger, reply_trigger);
- if (ret < 0) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
- }
-
- ret = 0;
- goto end;
-
-end_unset_name:
- trigger_status = lttng_trigger_set_name(trigger, NULL);
- if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
- ret = -LTTNG_ERR_UNK;
- }
-end:
- lttng_payload_reset(&message);
- lttng_payload_reset(&reply);
- lttng_trigger_destroy(reply_trigger);
- return ret;
-}
-
-int lttng_register_trigger(struct lttng_trigger *trigger)
-{
- /* Register an anonymous trigger. */
- return _lttng_register_trigger(trigger, NULL, false);
-}
-
-enum lttng_error_code lttng_register_trigger_with_name(
- struct lttng_trigger *trigger, const char *name)
-{
- const int ret = _lttng_register_trigger(trigger, name, false);
-
- return ret == 0 ? LTTNG_OK : (enum lttng_error_code) -ret;
-}
-
-enum lttng_error_code lttng_register_trigger_with_automatic_name(
- struct lttng_trigger *trigger)
-{
- const int ret = _lttng_register_trigger(trigger, false, true);
-
- return ret == 0 ? LTTNG_OK : (enum lttng_error_code) -ret;
-}
-
-enum lttng_error_code lttng_error_query_execute(
- const struct lttng_error_query *query,
- const struct lttng_endpoint *endpoint,
- struct lttng_error_query_results **results)
-{
- int ret;
- enum lttng_error_code ret_code;
- struct lttcomm_session_msg lsm = {
- .cmd_type = LTTNG_EXECUTE_ERROR_QUERY,
- };
- struct lttng_payload message;
- struct lttng_payload reply;
- struct lttcomm_session_msg *message_lsm;
-
- lttng_payload_init(&message);
- lttng_payload_init(&reply);
-
- if (!query || !results) {
- ret_code = LTTNG_ERR_INVALID;
- goto end;
- }
-
- if (endpoint != lttng_session_daemon_command_endpoint) {
- ret_code = LTTNG_ERR_INVALID_ERROR_QUERY_TARGET;
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
- if (ret) {
- ret_code = LTTNG_ERR_NOMEM;
- goto end;
- }
-
- ret = lttng_error_query_serialize(query, &message);
- if (ret) {
- ret_code = LTTNG_ERR_UNK;
- goto end;
- }
-
- message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
- message_lsm->u.error_query.length =
- (uint32_t) message.buffer.size - sizeof(lsm);
-
- {
- struct lttng_payload_view message_view =
- lttng_payload_view_from_payload(
- &message, 0, -1);
-
- message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
- &message_view);
- ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
- if (ret < 0) {
- ret_code = -ret;
- goto end;
- }
- }
-
- {
- ssize_t reply_create_ret;
- struct lttng_payload_view reply_view =
- lttng_payload_view_from_payload(
- &reply, 0, reply.buffer.size);
-
- reply_create_ret = lttng_error_query_results_create_from_payload(
- &reply_view, results);
- if (reply_create_ret < 0) {
- ret_code = LTTNG_ERR_INVALID_PROTOCOL;
- goto end;
- }
- }
-
- ret_code = LTTNG_OK;
-end:
- lttng_payload_reset(&message);
- lttng_payload_reset(&reply);
- return ret_code;
-}
-
-int lttng_unregister_trigger(const struct lttng_trigger *trigger)
-{
- int ret;
- struct lttcomm_session_msg lsm;
- struct lttcomm_session_msg *message_lsm;
- struct lttng_payload message;
- struct lttng_payload reply;
- struct lttng_trigger *copy = NULL;
- const struct lttng_credentials user_creds = {
- .uid = LTTNG_OPTIONAL_INIT_VALUE(geteuid()),
- .gid = LTTNG_OPTIONAL_INIT_UNSET,
- };
-
- lttng_payload_init(&message);
- lttng_payload_init(&reply);
-
- if (!trigger) {
- ret = -LTTNG_ERR_INVALID;
- goto end;
- }
-
- copy = lttng_trigger_copy(trigger);
- if (!copy) {
- ret = -LTTNG_ERR_UNK;
- goto end;
- }
-
- if (!copy->creds.uid.is_set) {
- /* Use the client credentials as the trigger credentials */
- lttng_trigger_set_credentials(copy, &user_creds);
- } else {
- /*
- * Validate that either the current trigger credentials and the
- * client credentials are identical or that the current user is
- * root. The root user can register, unregister triggers for
- * himself and other users.
- *
- * This check is also present on the sessiond side, using the
- * credentials passed on the socket. These check are all
- * "safety" checks.
- */
- const struct lttng_credentials *trigger_creds =
- lttng_trigger_get_credentials(copy);
- if (!lttng_credentials_is_equal_uid(trigger_creds, &user_creds)) {
- if (lttng_credentials_get_uid(&user_creds) != 0) {
- ret = -LTTNG_ERR_EPERM;
- goto end;
- }
- }
- }
-
- if (!lttng_trigger_validate(copy)) {
- ret = -LTTNG_ERR_INVALID_TRIGGER;
- goto end;
- }
-
- memset(&lsm, 0, sizeof(lsm));
- lsm.cmd_type = LTTNG_UNREGISTER_TRIGGER;
-
- ret = lttng_dynamic_buffer_append(&message.buffer, &lsm, sizeof(lsm));
- if (ret) {
- ret = -LTTNG_ERR_NOMEM;
- goto end;
- }
-
- ret = lttng_trigger_serialize(copy, &message);
- if (ret < 0) {
- ret = -LTTNG_ERR_UNK;
- goto end;
- }
-
- /*
- * This is needed to populate the trigger object size for the command
- * header and number of fds sent.
- */
- message_lsm = (struct lttcomm_session_msg *) message.buffer.data;
-
- message_lsm->u.trigger.length = (uint32_t) message.buffer.size - sizeof(lsm);
-
- {
- struct lttng_payload_view message_view =
- lttng_payload_view_from_payload(
- &message, 0, -1);
-
- /*
- * Update the message header with the number of fd that will be
- * sent.
- */
- message_lsm->fd_count = lttng_payload_view_get_fd_handle_count(
- &message_view);
-
- ret = lttng_ctl_ask_sessiond_payload(&message_view, &reply);
- if (ret < 0) {
- goto end;
- }
- }
-
- ret = 0;
-end:
- lttng_trigger_destroy(copy);
- lttng_payload_reset(&message);
- lttng_payload_reset(&reply);
- return ret;
-}
-
-/*
- * Ask the session daemon for all registered triggers for the current user.
- *
- * Allocates and return an lttng_triggers set.
- * On error, returns a suitable lttng_error_code.
- */
-enum lttng_error_code lttng_list_triggers(struct lttng_triggers **triggers)
-{
- int ret;
- enum lttng_error_code ret_code = LTTNG_OK;
- struct lttcomm_session_msg lsm = { .cmd_type = LTTNG_LIST_TRIGGERS };
- struct lttng_triggers *local_triggers = NULL;
- struct lttng_payload reply;
- struct lttng_payload_view lsm_view =
- lttng_payload_view_init_from_buffer(
- (const char *) &lsm, 0, sizeof(lsm));
-
- lttng_payload_init(&reply);
-
- ret = lttng_ctl_ask_sessiond_payload(&lsm_view, &reply);
- if (ret < 0) {
- ret_code = (enum lttng_error_code) -ret;
- goto end;
- }
-
- {
- struct lttng_payload_view reply_view =
- lttng_payload_view_from_payload(
- &reply, 0, reply.buffer.size);
-
- ret = lttng_triggers_create_from_payload(
- &reply_view, &local_triggers);
- if (ret < 0) {
- ret_code = LTTNG_ERR_FATAL;
- goto end;
- }
- }
-
- *triggers = local_triggers;
- local_triggers = NULL;
-end:
- lttng_payload_reset(&reply);
- lttng_triggers_destroy(local_triggers);
- return ret_code;
-}
-
-/*
- * lib constructor.
- */
-static void __attribute__((constructor)) init(void)
-{
- /* Set default session group */
- lttng_set_tracing_group(DEFAULT_TRACING_GROUP);
-}
-
-/*
- * lib destructor.
- */
-static void __attribute__((destructor)) lttng_ctl_exit(void)
-{
- free(tracing_group);
-}
projects / lttng-tools.git / blobdiff