+++ /dev/null
-/*
- * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
- *
- * SPDX-License-Identifier: LGPL-2.1-only
- *
- */
-
-#include <assert.h>
-#include <common/credentials.h>
-#include <common/error.h>
-#include <common/macros.h>
-#include <common/optional.h>
-#include <common/payload.h>
-#include <common/payload-view.h>
-#include <common/runas.h>
-#include <common/hashtable/hashtable.h>
-#include <common/hashtable/utils.h>
-#include <common/string-utils/string-utils.h>
-#include <lttng/event-rule/event-rule-internal.h>
-#include <lttng/event-rule/kernel-tracepoint-internal.h>
-#include <lttng/event.h>
-
-#define IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) \
- (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT)
-
-static void lttng_event_rule_kernel_tracepoint_destroy(struct lttng_event_rule *rule)
-{
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
-
- if (rule == NULL) {
- return;
- }
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
-
- free(tracepoint->pattern);
- free(tracepoint->filter_expression);
- free(tracepoint->internal_filter.filter);
- free(tracepoint->internal_filter.bytecode);
- free(tracepoint);
-}
-
-static bool lttng_event_rule_kernel_tracepoint_validate(
- const struct lttng_event_rule *rule)
-{
- bool valid = false;
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
-
- if (!rule) {
- goto end;
- }
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
-
- /* Required field. */
- if (!tracepoint->pattern) {
- ERR("Invalid kernel tracepoint event rule: a pattern must be set.");
- goto end;
- }
-
- valid = true;
-end:
- return valid;
-}
-
-static int lttng_event_rule_kernel_tracepoint_serialize(
- const struct lttng_event_rule *rule,
- struct lttng_payload *payload)
-{
- int ret;
- size_t pattern_len, filter_expression_len;
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
- struct lttng_event_rule_kernel_tracepoint_comm tracepoint_comm;
-
- if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule)) {
- ret = -1;
- goto end;
- }
-
- DBG("Serializing kernel tracepoint event rule.");
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
-
- pattern_len = strlen(tracepoint->pattern) + 1;
-
- if (tracepoint->filter_expression != NULL) {
- filter_expression_len =
- strlen(tracepoint->filter_expression) + 1;
- } else {
- filter_expression_len = 0;
- }
-
- tracepoint_comm.pattern_len = pattern_len;
- tracepoint_comm.filter_expression_len = filter_expression_len;
-
- ret = lttng_dynamic_buffer_append(&payload->buffer, &tracepoint_comm,
- sizeof(tracepoint_comm));
- if (ret) {
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(
- &payload->buffer, tracepoint->pattern, pattern_len);
- if (ret) {
- goto end;
- }
-
- ret = lttng_dynamic_buffer_append(&payload->buffer, tracepoint->filter_expression,
- filter_expression_len);
- if (ret) {
- goto end;
- }
-
-end:
- return ret;
-}
-
-static bool lttng_event_rule_kernel_tracepoint_is_equal(
- const struct lttng_event_rule *_a,
- const struct lttng_event_rule *_b)
-{
- bool is_equal = false;
- struct lttng_event_rule_kernel_tracepoint *a, *b;
-
- a = container_of(_a, struct lttng_event_rule_kernel_tracepoint, parent);
- b = container_of(_b, struct lttng_event_rule_kernel_tracepoint, parent);
-
- if (!!a->filter_expression != !!b->filter_expression) {
- goto end;
- }
-
- /* Long check. */
- assert(a->pattern);
- assert(b->pattern);
- if (strcmp(a->pattern, b->pattern)) {
- goto end;
- }
-
- if (a->filter_expression && b->filter_expression) {
- if (strcmp(a->filter_expression, b->filter_expression)) {
- goto end;
- }
- } else if (!!a->filter_expression != !!b->filter_expression) {
- /* One is set; not the other. */
- goto end;
- }
-
- is_equal = true;
-end:
- return is_equal;
-}
-
-static enum lttng_error_code
-lttng_event_rule_kernel_tracepoint_generate_filter_bytecode(
- struct lttng_event_rule *rule,
- const struct lttng_credentials *creds)
-{
- int ret;
- enum lttng_error_code ret_code;
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
- enum lttng_event_rule_status status;
- const char *filter;
- struct lttng_bytecode *bytecode = NULL;
-
- assert(rule);
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
-
- status = lttng_event_rule_kernel_tracepoint_get_filter(rule, &filter);
- if (status == LTTNG_EVENT_RULE_STATUS_UNSET) {
- filter = NULL;
- } else if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- ret_code = LTTNG_ERR_FILTER_INVAL;
- goto end;
- }
-
- if (filter && filter[0] == '\0') {
- ret_code = LTTNG_ERR_FILTER_INVAL;
- goto error;
- }
-
- if (filter) {
- tracepoint->internal_filter.filter = strdup(filter);
- if (tracepoint->internal_filter.filter == NULL) {
- ret_code = LTTNG_ERR_NOMEM;
- goto error;
- }
- } else {
- tracepoint->internal_filter.filter = NULL;
- }
-
- if (tracepoint->internal_filter.filter == NULL) {
- ret_code = LTTNG_OK;
- goto end;
- }
-
- ret = run_as_generate_filter_bytecode(
- tracepoint->internal_filter.filter, creds,
- &bytecode);
- if (ret) {
- ret_code = LTTNG_ERR_FILTER_INVAL;
- goto end;
- }
-
- tracepoint->internal_filter.bytecode = bytecode;
- bytecode = NULL;
- ret_code = LTTNG_OK;
-
-error:
-end:
- free(bytecode);
- return ret_code;
-}
-
-static const char *lttng_event_rule_kernel_tracepoint_get_internal_filter(
- const struct lttng_event_rule *rule)
-{
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
-
- assert(rule);
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
- return tracepoint->internal_filter.filter;
-}
-
-static const struct lttng_bytecode *
-lttng_event_rule_kernel_tracepoint_get_internal_filter_bytecode(
- const struct lttng_event_rule *rule)
-{
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
-
- assert(rule);
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
- return tracepoint->internal_filter.bytecode;
-}
-
-static enum lttng_event_rule_generate_exclusions_status
-lttng_event_rule_kernel_tracepoint_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_tracepoint_hash(
- const struct lttng_event_rule *rule)
-{
- unsigned long hash;
- struct lttng_event_rule_kernel_tracepoint *tp_rule =
- container_of(rule, typeof(*tp_rule), parent);
-
- hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT,
- lttng_ht_seed);
- hash ^= hash_key_str(tp_rule->pattern, lttng_ht_seed);
-
- if (tp_rule->filter_expression) {
- hash ^= hash_key_str(tp_rule->filter_expression, lttng_ht_seed);
- }
-
- return hash;
-}
-
-struct lttng_event_rule *lttng_event_rule_kernel_tracepoint_create(void)
-{
- struct lttng_event_rule *rule = NULL;
- struct lttng_event_rule_kernel_tracepoint *tp_rule;
- enum lttng_event_rule_status status;
-
- tp_rule = zmalloc(sizeof(struct lttng_event_rule_kernel_tracepoint));
- if (!tp_rule) {
- goto end;
- }
-
- rule = &tp_rule->parent;
- lttng_event_rule_init(&tp_rule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_TRACEPOINT);
- tp_rule->parent.validate = lttng_event_rule_kernel_tracepoint_validate;
- tp_rule->parent.serialize = lttng_event_rule_kernel_tracepoint_serialize;
- tp_rule->parent.equal = lttng_event_rule_kernel_tracepoint_is_equal;
- tp_rule->parent.destroy = lttng_event_rule_kernel_tracepoint_destroy;
- tp_rule->parent.generate_filter_bytecode =
- lttng_event_rule_kernel_tracepoint_generate_filter_bytecode;
- tp_rule->parent.get_filter =
- lttng_event_rule_kernel_tracepoint_get_internal_filter;
- tp_rule->parent.get_filter_bytecode =
- lttng_event_rule_kernel_tracepoint_get_internal_filter_bytecode;
- tp_rule->parent.generate_exclusions =
- lttng_event_rule_kernel_tracepoint_generate_exclusions;
- tp_rule->parent.hash = lttng_event_rule_kernel_tracepoint_hash;
-
- /* Not necessary for now. */
- tp_rule->parent.generate_lttng_event = NULL;
-
- /* Default pattern is '*'. */
- status = lttng_event_rule_kernel_tracepoint_set_name_pattern(rule, "*");
- if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- lttng_event_rule_destroy(rule);
- rule = NULL;
- }
-
-end:
- return rule;
-}
-
-LTTNG_HIDDEN
-ssize_t lttng_event_rule_kernel_tracepoint_create_from_payload(
- struct lttng_payload_view *view,
- struct lttng_event_rule **_event_rule)
-{
- ssize_t ret, offset = 0;
- enum lttng_event_rule_status status;
- const struct lttng_event_rule_kernel_tracepoint_comm *tracepoint_comm;
- const char *pattern;
- const char *filter_expression = NULL;
- struct lttng_buffer_view current_buffer_view;
- struct lttng_event_rule *rule = NULL;
-
- if (!_event_rule) {
- ret = -1;
- goto end;
- }
-
- current_buffer_view = lttng_buffer_view_from_view(
- &view->buffer, offset, sizeof(*tracepoint_comm));
- if (!lttng_buffer_view_is_valid(¤t_buffer_view)) {
- ERR("Failed to initialize from malformed event rule kernel tracepoint: buffer too short to contain header.");
- ret = -1;
- goto end;
- }
-
- tracepoint_comm = (typeof(tracepoint_comm)) current_buffer_view.data;
-
- /* Skip to payload. */
- offset += current_buffer_view.size;
-
- /* Map the pattern. */
- current_buffer_view = lttng_buffer_view_from_view(
- &view->buffer, offset, tracepoint_comm->pattern_len);
-
- if (!lttng_buffer_view_is_valid(¤t_buffer_view)) {
- ret = -1;
- goto end;
- }
-
- pattern = current_buffer_view.data;
- if (!lttng_buffer_view_contains_string(¤t_buffer_view, pattern,
- tracepoint_comm->pattern_len)) {
- ret = -1;
- goto end;
- }
-
- /* Skip after the pattern. */
- offset += tracepoint_comm->pattern_len;
-
- if (!tracepoint_comm->filter_expression_len) {
- goto skip_filter_expression;
- }
-
- /* Map the filter_expression. */
- current_buffer_view = lttng_buffer_view_from_view(&view->buffer, offset,
- tracepoint_comm->filter_expression_len);
- if (!lttng_buffer_view_is_valid(¤t_buffer_view)) {
- ret = -1;
- goto end;
- }
-
- filter_expression = current_buffer_view.data;
- if (!lttng_buffer_view_contains_string(¤t_buffer_view,
- filter_expression,
- tracepoint_comm->filter_expression_len)) {
- ret = -1;
- goto end;
- }
-
- /* Skip after the pattern. */
- offset += tracepoint_comm->filter_expression_len;
-
-skip_filter_expression:
-
- rule = lttng_event_rule_kernel_tracepoint_create();
- if (!rule) {
- ERR("Failed to create event rule kernel tracepoint.");
- ret = -1;
- goto end;
- }
-
- status = lttng_event_rule_kernel_tracepoint_set_name_pattern(rule, pattern);
- if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- ERR("Failed to set event rule kernel tracepoint pattern.");
- ret = -1;
- goto end;
- }
-
- if (filter_expression) {
- status = lttng_event_rule_kernel_tracepoint_set_filter(
- rule, filter_expression);
- if (status != LTTNG_EVENT_RULE_STATUS_OK) {
- ERR("Failed to set event rule kernel tracepoint pattern.");
- ret = -1;
- goto end;
- }
- }
-
- *_event_rule = rule;
- rule = NULL;
- ret = offset;
-end:
- lttng_event_rule_destroy(rule);
- return ret;
-}
-
-enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_set_name_pattern(
- struct lttng_event_rule *rule, const char *pattern)
-{
- char *pattern_copy = NULL;
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !pattern ||
- strlen(pattern) == 0) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
- pattern_copy = strdup(pattern);
- if (!pattern_copy) {
- status = LTTNG_EVENT_RULE_STATUS_ERROR;
- goto end;
- }
-
- /* Normalize the pattern. */
- strutils_normalize_star_glob_pattern(pattern_copy);
-
- free(tracepoint->pattern);
-
- tracepoint->pattern = pattern_copy;
- pattern_copy = NULL;
-end:
- return status;
-}
-
-enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_get_name_pattern(
- const struct lttng_event_rule *rule, const char **pattern)
-{
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !pattern) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
- if (!tracepoint->pattern) {
- status = LTTNG_EVENT_RULE_STATUS_UNSET;
- goto end;
- }
-
- *pattern = tracepoint->pattern;
-end:
- return status;
-}
-
-enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_set_filter(
- struct lttng_event_rule *rule, const char *expression)
-{
- char *expression_copy = NULL;
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !expression ||
- strlen(expression) == 0) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
- expression_copy = strdup(expression);
- if (!expression_copy) {
- PERROR("Failed to copy filter expression");
- status = LTTNG_EVENT_RULE_STATUS_ERROR;
- goto end;
- }
-
- if (tracepoint->filter_expression) {
- free(tracepoint->filter_expression);
- }
-
- tracepoint->filter_expression = expression_copy;
- expression_copy = NULL;
-end:
- return status;
-}
-
-enum lttng_event_rule_status lttng_event_rule_kernel_tracepoint_get_filter(
- const struct lttng_event_rule *rule, const char **expression)
-{
- struct lttng_event_rule_kernel_tracepoint *tracepoint;
- enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
-
- if (!rule || !IS_KERNEL_TRACEPOINT_EVENT_RULE(rule) || !expression) {
- status = LTTNG_EVENT_RULE_STATUS_INVALID;
- goto end;
- }
-
- tracepoint = container_of(
- rule, struct lttng_event_rule_kernel_tracepoint, parent);
- if (!tracepoint->filter_expression) {
- status = LTTNG_EVENT_RULE_STATUS_UNSET;
- goto end;
- }
-
- *expression = tracepoint->filter_expression;
-end:
- return status;
-}
projects / lttng-tools.git / blobdiff