+++ /dev/null
-/*
- * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#include <common/credentials.h>
-#include <common/error.h>
-#include <common/hashtable/hashtable.h>
-#include <common/hashtable/utils.h>
-#include <common/macros.h>
-#include <common/mi-lttng.h>
-#include <common/payload-view.h>
-#include <common/payload.h>
-#include <common/runas.h>
-#include <lttng/event-rule/event-rule-internal.h>
-#include <lttng/event-rule/kernel-uprobe-internal.h>
-#include <lttng/userspace-probe-internal.h>
-
-#define IS_UPROBE_EVENT_RULE(rule) \
- (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE)
-
-static void lttng_event_rule_kernel_uprobe_destroy(struct lttng_event_rule *rule)
-{
- struct lttng_event_rule_kernel_uprobe *uprobe;
-
- uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent);
-
- lttng_userspace_probe_location_destroy(uprobe->location);
- free(uprobe->name);
- free(uprobe);
-}
-
-static bool lttng_event_rule_kernel_uprobe_validate(
- const struct lttng_event_rule *rule)
-{
- bool valid = false;
- struct lttng_event_rule_kernel_uprobe *uprobe;
-
- if (!rule) {
- goto end;
- }
-
- uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent);
-
- /* Required field. */
- if (!uprobe->name) {
- ERR("Invalid uprobe event rule: a pattern must be set.");
- goto end;
- }
-
- if (!uprobe->location) {
- ERR("Invalid uprobe event rule: a location must be set.");
- goto end;
- }
-
- valid = true;
-end:
- return valid;
-}
-
-static int lttng_event_rule_kernel_uprobe_serialize(
- const struct lttng_event_rule *rule,
- struct lttng_payload *payload)
-{
- int ret;
- size_t name_len, header_offset, size_before_probe;
- struct lttng_event_rule_kernel_uprobe *uprobe;
- struct lttng_event_rule_kernel_uprobe_comm uprobe_comm = {};
- struct lttng_event_rule_kernel_uprobe_comm *header;
-
- if (!rule || !IS_UPROBE_EVENT_RULE(rule)) {
- ret = -1;
- goto end;
- }
-
- header_offset = payload->buffer.size;
-
- DBG("Serializing uprobe event rule.");
- uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent);
-
- name_len = strlen(uprobe->name) + 1;
-
- uprobe_comm.name_len = name_len;
-
- ret = lttng_dynamic_buffer_append(
- &payload->buffer, &uprobe_comm, sizeof(uprobe_comm));
- if (ret) {
- goto end;
- }
- ret = lttng_dynamic_buffer_append(
- &payload->buffer, uprobe->name, name_len);
- if (ret) {
- goto end;
- }
-
- size_before_probe = payload->buffer.size;
-
- /* This serialize return the size taken in the buffer. */
- ret = lttng_userspace_probe_location_serialize(
- uprobe->location, payload);
- if (ret < 0) {
- goto end;
- }
-
- /* Update the header regarding the probe size. */
- header = (struct lttng_event_rule_kernel_uprobe_comm
- *) ((char *) payload->buffer.data +
- header_offset);
- header->location_len = payload->buffer.size - size_before_probe;
-
- ret = 0;
-
-end:
- return ret;
-}
-
-static bool lttng_event_rule_kernel_uprobe_is_equal(const struct lttng_event_rule *_a,
- const struct lttng_event_rule *_b)
-{
- bool is_equal = false;
- struct lttng_event_rule_kernel_uprobe *a, *b;
-
- a = container_of(_a, struct lttng_event_rule_kernel_uprobe, parent);
- b = container_of(_b, struct lttng_event_rule_kernel_uprobe, parent);
-
- /* uprobe is invalid if this is not true. */
- LTTNG_ASSERT(a->name);
- LTTNG_ASSERT(b->name);
- if (strcmp(a->name, b->name)) {
- goto end;
- }
-
- LTTNG_ASSERT(a->location);
- LTTNG_ASSERT(b->location);
- is_equal = lttng_userspace_probe_location_is_equal(
- a->location, b->location);
-end:
- return is_equal;
-}
-
-static enum lttng_error_code lttng_event_rule_kernel_uprobe_generate_filter_bytecode(
- struct lttng_event_rule *rule,
- const struct lttng_credentials *creds)
-{
- /* Nothing to do. */
- return LTTNG_OK;
-}
-
-static const char *lttng_event_rule_kernel_uprobe_get_filter(
- const struct lttng_event_rule *rule)
-{
- /* Unsupported. */
- return NULL;
-}
-
-static const struct lttng_bytecode *
-lttng_event_rule_kernel_uprobe_get_filter_bytecode(const struct lttng_event_rule *rule)
-{
- /* Unsupported. */
- return NULL;
-}
-
-static enum lttng_event_rule_generate_exclusions_status
-lttng_event_rule_kernel_uprobe_generate_exclusions(const struct lttng_event_rule *rule,
- struct lttng_event_exclusion **exclusions)
-{
- /* Unsupported. */
- *exclusions = NULL;
- return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE;
-}
-
-static unsigned long
-lttng_event_rule_kernel_uprobe_hash(
- const struct lttng_event_rule *rule)
-{
- unsigned long hash;
- struct lttng_event_rule_kernel_uprobe *urule =
- container_of(rule, typeof(*urule), parent);
-
- hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE,
- lttng_ht_seed);
- hash ^= hash_key_str(urule->name, lttng_ht_seed);
- hash ^= lttng_userspace_probe_location_hash(urule->location);
-
- return hash;
-}
-
-static
-int userspace_probe_set_location(
- struct lttng_event_rule_kernel_uprobe *uprobe,
- const struct lttng_userspace_probe_location *location)
-{
- int ret;
- struct lttng_userspace_probe_location *location_copy = NULL;
-
- if (!uprobe || !location || uprobe->location) {
- ret = -1;
- goto end;
- }
-
- location_copy = lttng_userspace_probe_location_copy(location);
- if (!location_copy) {
- ret = -1;
- goto end;
- }
-
- uprobe->location = location_copy;
- location_copy = NULL;
- ret = 0;
-end:
- lttng_userspace_probe_location_destroy(location_copy);
- return ret;
-}
-
-static enum lttng_error_code lttng_event_rule_kernel_uprobe_mi_serialize(
- const struct lttng_event_rule *rule, struct mi_writer *writer)
-{
- int ret;
- enum lttng_error_code ret_code;
- enum lttng_event_rule_status status;
- const char *event_name = NULL;
- const struct lttng_userspace_probe_location *location = NULL;
-
- LTTNG_ASSERT(rule);
- LTTNG_ASSERT(writer);
- LTTNG_ASSERT(IS_UPROBE_EVENT_RULE(rule));
-
- status = lttng_event_rule_kernel_uprobe_get_event_name(
- rule, &event_name);
- LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
- LTTNG_ASSERT(event_name);
-
- status = lttng_event_rule_kernel_uprobe_get_location(rule, &location);
- LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
- LTTNG_ASSERT(location);
-
- /* Open event rule kernel uprobe element. */
- ret = mi_lttng_writer_open_element(
- writer, mi_lttng_element_event_rule_kernel_uprobe);
- if (ret) {
- goto mi_error;
- }
-
- /* Event name. */
- ret = mi_lttng_writer_write_element_string(writer,
- mi_lttng_element_event_rule_event_name, event_name);
- if (ret) {
- goto mi_error;
- }
-
- /* Probe location. */
- ret_code = lttng_userspace_probe_location_mi_serialize(location, writer);
- if (ret_code != LTTNG_OK) {
- goto end;
- }
-
- /* Close event rule kernel uprobe element. */
- ret = mi_lttng_writer_close_element(writer);
- if (ret) {
- goto mi_error;
- }
-
- ret_code = LTTNG_OK;
- goto end;
-
-mi_error:
- ret_code = LTTNG_ERR_MI_IO_FAIL;
-end:
- return ret_code;
-}
-
-struct lttng_event_rule *lttng_event_rule_kernel_uprobe_create(
- const struct lttng_userspace_probe_location *location)
-{
- struct lttng_event_rule *rule = NULL;
- struct lttng_event_rule_kernel_uprobe *urule;
-
- urule = zmalloc(sizeof(struct lttng_event_rule_kernel_uprobe));
- if (!urule) {
- goto end;
- }
-
- rule = &urule->parent;
- lttng_event_rule_init(&urule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_UPROBE);
- urule->parent.validate = lttng_event_rule_kernel_uprobe_validate;
- urule->parent.serialize = lttng_event_rule_kernel_uprobe_serialize;
- urule->parent.equal = lttng_event_rule_kernel_uprobe_is_equal;
- urule->parent.destroy = lttng_event_rule_kernel_uprobe_destroy;
- urule->parent.generate_filter_bytecode =
- lttng_event_rule_kernel_uprobe_generate_filter_bytecode;
- urule->parent.get_filter = lttng_event_rule_kernel_uprobe_get_filter;
- urule->parent.get_filter_bytecode =
- lttng_event_rule_kernel_uprobe_get_filter_bytecode;
- urule->parent.generate_exclusions =
- lttng_event_rule_kernel_uprobe_generate_exclusions;
- urule->parent.hash = lttng_event_rule_kernel_uprobe_hash;
- urule->parent.mi_serialize = lttng_event_rule_kernel_uprobe_mi_serialize;
-
- if (userspace_probe_set_location(urule, location)) {
- lttng_event_rule_destroy(rule);
- rule = NULL;
- }
-
-end:
- return rule;
-}
-
-ssize_t lttng_event_rule_kernel_uprobe_create_from_payload(
- struct lttng_payload_view *view,
- struct lttng_event_rule **_event_rule)
-{
- ssize_t ret, offset = 0;
- const struct lttng_event_rule_kernel_uprobe_comm *uprobe_comm;
- const char *name;
- struct lttng_buffer_view current_buffer_view;
- struct lttng_event_rule *rule = NULL;
- struct lttng_userspace_probe_location *location = NULL;
- enum lttng_event_rule_status status;
-
- if (!_event_rule) {
- ret = -1;
- goto end;
- }
-
- current_buffer_view = lttng_buffer_view_from_view(
- &view->buffer, offset, sizeof(*uprobe_comm));
- if (!lttng_buffer_view_is_valid(¤t_buffer_view)) {
- ERR("Failed to initialize from malformed event rule uprobe: buffer too short to contain header");
- ret = -1;
- goto end;
- }
-
- uprobe_comm = (typeof(uprobe_comm)) current_buffer_view.data;
-
- /* Skip to payload. */
- offset += current_buffer_view.size;
-
- /* Map the name. */
- current_buffer_view = lttng_buffer_view_from_view(
- &view->buffer, offset, uprobe_comm->name_len);
- if (!lttng_buffer_view_is_valid(¤t_buffer_view)) {
- ret = -1;
- goto end;
- }
-
- name = current_buffer_view.data;
- if (!lttng_buffer_view_contains_string(¤t_buffer_view, name,
- uprobe_comm->name_len)) {
- ret = -1;
- goto end;
- }
-
- /* Skip after the name. */
- offset += uprobe_comm->name_len;
-
- /* Map the location. */
- {
- struct lttng_payload_view current_payload_view =
- lttng_payload_view_from_view(view, offset,
- uprobe_comm->location_len);
-
- if (!lttng_payload_view_is_valid(¤t_payload_view)) {
- ERR("Failed to initialize from malformed event rule uprobe: buffer too short to contain location");
- ret = -1;
- goto end;
- }
-
- ret = lttng_userspace_probe_location_create_from_payload(
- ¤t_payload_view, &location);
- if (ret < 0) {
- ret = -1;
- goto end;
- }
- }
-
- LTTNG_ASSERT(ret == uprobe_comm->location_len);
-
- /* Skip after the location. */
- offset += uprobe_comm->location_len;
-
- rule = lttng_event_rule_kernel_uprobe_create(location);
- if (!rule) {
- ERR("Failed to create event rule uprobe.");
- ret = -1;
- goto end;
- }
-
- status = lttng_event_rule_kernel_uprobe_set_event_name(rule, name);
- if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- ret = -1;
- goto end;
- }
-
- if (!lttng_event_rule_kernel_uprobe_validate(rule)) {
- ret = -1;
- goto end;
- }
-
- *_event_rule = rule;
- rule = NULL;
- ret = offset;
-end:
- lttng_userspace_probe_location_destroy(location);
- lttng_event_rule_destroy(rule);
- return ret;
-}
-
-
-enum lttng_event_rule_status lttng_event_rule_kernel_uprobe_get_location(
- const struct lttng_event_rule *rule,
- const struct lttng_userspace_probe_location **location)
-{
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_UPROBE_EVENT_RULE(rule) || !location) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- *location = lttng_event_rule_kernel_uprobe_get_location_mutable(rule);
- if (!*location) {
- status = LTTNG_EVENT_RULE_STATUS_UNSET;
- goto end;
- }
-
-end:
- return status;
-}
-
-struct lttng_userspace_probe_location *
-lttng_event_rule_kernel_uprobe_get_location_mutable(
- const struct lttng_event_rule *rule)
-{
- struct lttng_event_rule_kernel_uprobe *uprobe;
-
- LTTNG_ASSERT(rule);
- uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent);
-
- return uprobe->location;
-}
-
-enum lttng_event_rule_status lttng_event_rule_kernel_uprobe_set_event_name(
- struct lttng_event_rule *rule, const char *name)
-{
- char *name_copy = NULL;
- struct lttng_event_rule_kernel_uprobe *uprobe;
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_UPROBE_EVENT_RULE(rule) || !name ||
- strlen(name) == 0) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent);
- name_copy = strdup(name);
- if (!name_copy) {
- status = LTTNG_EVENT_RULE_STATUS_ERROR;
- goto end;
- }
-
- if (uprobe->name) {
- free(uprobe->name);
- }
-
- uprobe->name = name_copy;
- name_copy = NULL;
-end:
- return status;
-}
-
-enum lttng_event_rule_status lttng_event_rule_kernel_uprobe_get_event_name(
- const struct lttng_event_rule *rule, const char **name)
-{
- struct lttng_event_rule_kernel_uprobe *uprobe;
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_UPROBE_EVENT_RULE(rule) || !name) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- uprobe = container_of(rule, struct lttng_event_rule_kernel_uprobe, parent);
- if (!uprobe->name) {
- status = LTTNG_EVENT_RULE_STATUS_UNSET;
- goto end;
- }
-
- *name = uprobe->name;
-end:
- return status;
-}
projects / lttng-tools.git / blobdiff