X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fevent-rule%2Flog4j-logging.cpp;fp=src%2Fcommon%2Fevent-rule%2Flog4j-logging.cpp;h=25f2c4c0e7ee5d5344bc228a018262365f0af3e6;hp=0000000000000000000000000000000000000000;hb=a6bc4ca9d659caf016ef932fcd944029737ac57c;hpb=97535efaa975ca52bf02c2d5e76351bfd2e3defa diff --git a/src/common/event-rule/log4j-logging.cpp b/src/common/event-rule/log4j-logging.cpp new file mode 100644 index 000000000..25f2c4c0e --- /dev/null +++ b/src/common/event-rule/log4j-logging.cpp @@ -0,0 +1,921 @@ +/* + * Copyright (C) 2019 Jonathan Rajotte + * + * SPDX-License-Identifier: LGPL-2.1-only + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define IS_LOG4J_LOGGING_EVENT_RULE(rule) \ + (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING) + +static void lttng_event_rule_log4j_logging_destroy(struct lttng_event_rule *rule) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + + if (rule == NULL) { + return; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + + lttng_log_level_rule_destroy(log4j_logging->log_level_rule); + free(log4j_logging->pattern); + free(log4j_logging->filter_expression); + free(log4j_logging->internal_filter.filter); + free(log4j_logging->internal_filter.bytecode); + free(log4j_logging); +} + +static bool lttng_event_rule_log4j_logging_validate( + const struct lttng_event_rule *rule) +{ + bool valid = false; + struct lttng_event_rule_log4j_logging *log4j_logging; + + if (!rule) { + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + + /* Required field. */ + if (!log4j_logging->pattern) { + ERR("Invalid log4j_logging event rule: a pattern must be set."); + goto end; + } + + valid = true; +end: + return valid; +} + +static int lttng_event_rule_log4j_logging_serialize( + const struct lttng_event_rule *rule, + struct lttng_payload *payload) +{ + int ret; + size_t pattern_len, filter_expression_len, header_offset; + size_t size_before_log_level_rule; + struct lttng_event_rule_log4j_logging *log4j_logging; + struct lttng_event_rule_log4j_logging_comm log4j_logging_comm; + struct lttng_event_rule_log4j_logging_comm *header; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule)) { + ret = -1; + goto end; + } + + header_offset = payload->buffer.size; + + DBG("Serializing log4j_logging event rule."); + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + + pattern_len = strlen(log4j_logging->pattern) + 1; + + if (log4j_logging->filter_expression != NULL) { + filter_expression_len = + strlen(log4j_logging->filter_expression) + 1; + } else { + filter_expression_len = 0; + } + + log4j_logging_comm.pattern_len = pattern_len; + log4j_logging_comm.filter_expression_len = filter_expression_len; + + ret = lttng_dynamic_buffer_append(&payload->buffer, &log4j_logging_comm, + sizeof(log4j_logging_comm)); + if (ret) { + goto end; + } + + ret = lttng_dynamic_buffer_append( + &payload->buffer, log4j_logging->pattern, pattern_len); + if (ret) { + goto end; + } + + ret = lttng_dynamic_buffer_append(&payload->buffer, log4j_logging->filter_expression, + filter_expression_len); + if (ret) { + goto end; + } + + size_before_log_level_rule = payload->buffer.size; + + ret = lttng_log_level_rule_serialize(log4j_logging->log_level_rule, payload); + if (ret < 0) { + goto end; + } + + header = (typeof(header)) ((char *) payload->buffer.data + header_offset); + header->log_level_rule_len = + payload->buffer.size - size_before_log_level_rule; + +end: + return ret; +} + +static bool lttng_event_rule_log4j_logging_is_equal( + const struct lttng_event_rule *_a, + const struct lttng_event_rule *_b) +{ + bool is_equal = false; + struct lttng_event_rule_log4j_logging *a, *b; + + a = container_of(_a, struct lttng_event_rule_log4j_logging, parent); + b = container_of(_b, struct lttng_event_rule_log4j_logging, parent); + + /* Quick checks. */ + + if (!!a->filter_expression != !!b->filter_expression) { + goto end; + } + + /* Long check. */ + LTTNG_ASSERT(a->pattern); + LTTNG_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; + } + + if (!lttng_log_level_rule_is_equal( + a->log_level_rule, b->log_level_rule)) { + goto end; + } + + is_equal = true; +end: + return is_equal; +} + +/* + * On success ret is 0; + * + * On error ret is negative. + * + * An event with NO loglevel and the name is * will return NULL. + */ +static int generate_agent_filter( + const struct lttng_event_rule *rule, char **_agent_filter) +{ + int err; + int ret = 0; + char *agent_filter = NULL; + const char *pattern; + const char *filter; + const struct lttng_log_level_rule *log_level_rule = NULL; + enum lttng_event_rule_status status; + + LTTNG_ASSERT(rule); + LTTNG_ASSERT(_agent_filter); + + status = lttng_event_rule_log4j_logging_get_name_pattern(rule, &pattern); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ret = -1; + goto end; + } + + status = lttng_event_rule_log4j_logging_get_filter(rule, &filter); + if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { + filter = NULL; + } else if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ret = -1; + goto end; + } + + + /* Don't add filter for the '*' event. */ + if (strcmp(pattern, "*") != 0) { + if (filter) { + err = asprintf(&agent_filter, + "(%s) && (logger_name == \"%s\")", + filter, pattern); + } else { + err = asprintf(&agent_filter, "logger_name == \"%s\"", + pattern); + } + + if (err < 0) { + PERROR("Failed to format agent filter string"); + ret = -1; + goto end; + } + } + + status = lttng_event_rule_log4j_logging_get_log_level_rule( + rule, &log_level_rule); + if (status == LTTNG_EVENT_RULE_STATUS_OK) { + enum lttng_log_level_rule_status llr_status; + const char *op; + int level; + + switch (lttng_log_level_rule_get_type(log_level_rule)) + { + case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: + llr_status = lttng_log_level_rule_exactly_get_level( + log_level_rule, &level); + op = "=="; + break; + case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: + llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level( + log_level_rule, &level); + op = ">="; + break; + default: + abort(); + } + + if (llr_status != LTTNG_LOG_LEVEL_RULE_STATUS_OK) { + ret = -1; + goto end; + } + + if (filter || agent_filter) { + char *new_filter; + + err = asprintf(&new_filter, + "(%s) && (int_loglevel %s %d)", + agent_filter ? agent_filter : filter, + op, level); + if (agent_filter) { + free(agent_filter); + } + agent_filter = new_filter; + } else { + err = asprintf(&agent_filter, "int_loglevel %s %d", op, + level); + } + + if (err < 0) { + PERROR("Failed to format agent filter string"); + ret = -1; + goto end; + } + } + + *_agent_filter = agent_filter; + agent_filter = NULL; + +end: + free(agent_filter); + return ret; +} + +static enum lttng_error_code +lttng_event_rule_log4j_logging_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_log4j_logging *log4j_logging; + enum lttng_event_rule_status status; + const char *filter; + struct lttng_bytecode *bytecode = NULL; + char *agent_filter; + + LTTNG_ASSERT(rule); + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + + status = lttng_event_rule_log4j_logging_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; + } + + ret = generate_agent_filter(rule, &agent_filter); + if (ret) { + ret_code = LTTNG_ERR_FILTER_INVAL; + goto error; + } + + log4j_logging->internal_filter.filter = agent_filter; + + if (log4j_logging->internal_filter.filter == NULL) { + ret_code = LTTNG_OK; + goto end; + } + + ret = run_as_generate_filter_bytecode( + log4j_logging->internal_filter.filter, creds, + &bytecode); + if (ret) { + ret_code = LTTNG_ERR_FILTER_INVAL; + goto end; + } + + log4j_logging->internal_filter.bytecode = bytecode; + bytecode = NULL; + ret_code = LTTNG_OK; + +error: +end: + free(bytecode); + return ret_code; +} + +static const char *lttng_event_rule_log4j_logging_get_internal_filter( + const struct lttng_event_rule *rule) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + + LTTNG_ASSERT(rule); + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + return log4j_logging->internal_filter.filter; +} + +static const struct lttng_bytecode * +lttng_event_rule_log4j_logging_get_internal_filter_bytecode( + const struct lttng_event_rule *rule) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + + LTTNG_ASSERT(rule); + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + return log4j_logging->internal_filter.bytecode; +} + +static enum lttng_event_rule_generate_exclusions_status +lttng_event_rule_log4j_logging_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_log4j_logging_hash( + const struct lttng_event_rule *rule) +{ + unsigned long hash; + struct lttng_event_rule_log4j_logging *tp_rule = + container_of(rule, typeof(*tp_rule), parent); + + hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING, + 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); + } + + if (tp_rule->log_level_rule) { + hash ^= lttng_log_level_rule_hash(tp_rule->log_level_rule); + } + + return hash; +} + +static struct lttng_event *lttng_event_rule_log4j_logging_generate_lttng_event( + const struct lttng_event_rule *rule) +{ + int ret; + const struct lttng_event_rule_log4j_logging *log4j_logging; + struct lttng_event *local_event = NULL; + struct lttng_event *event = NULL; + enum lttng_loglevel_type loglevel_type; + int loglevel_value = 0; + enum lttng_event_rule_status status; + const struct lttng_log_level_rule *log_level_rule; + + log4j_logging = container_of( + rule, const struct lttng_event_rule_log4j_logging, parent); + + local_event = (lttng_event *) zmalloc(sizeof(*local_event)); + if (!local_event) { + goto error; + } + + local_event->type = LTTNG_EVENT_TRACEPOINT; + ret = lttng_strncpy(local_event->name, log4j_logging->pattern, + sizeof(local_event->name)); + if (ret) { + ERR("Truncation occurred when copying event rule pattern to `lttng_event` structure: pattern = '%s'", + log4j_logging->pattern); + goto error; + } + + + /* Map the log level rule to an equivalent lttng_loglevel. */ + status = lttng_event_rule_log4j_logging_get_log_level_rule( + rule, &log_level_rule); + if (status == LTTNG_EVENT_RULE_STATUS_UNSET) { + loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL; + loglevel_value = 0; + } else if (status == LTTNG_EVENT_RULE_STATUS_OK) { + enum lttng_log_level_rule_status llr_status; + + switch (lttng_log_level_rule_get_type(log_level_rule)) { + case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY: + llr_status = lttng_log_level_rule_exactly_get_level( + log_level_rule, &loglevel_value); + loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE; + break; + case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS: + llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level( + log_level_rule, &loglevel_value); + loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE; + break; + default: + abort(); + break; + } + + if (llr_status != LTTNG_LOG_LEVEL_RULE_STATUS_OK) { + goto error; + } + } else { + goto error; + } + + local_event->loglevel_type = loglevel_type; + local_event->loglevel = loglevel_value; + + event = local_event; + local_event = NULL; +error: + free(local_event); + return event; +} + +static enum lttng_error_code lttng_event_rule_log4j_logging_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 *filter = NULL; + const char *name_pattern = NULL; + const struct lttng_log_level_rule *log_level_rule = NULL; + + LTTNG_ASSERT(rule); + LTTNG_ASSERT(writer); + LTTNG_ASSERT(IS_LOG4J_LOGGING_EVENT_RULE(rule)); + + status = lttng_event_rule_log4j_logging_get_name_pattern( + rule, &name_pattern); + LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK); + LTTNG_ASSERT(name_pattern); + + status = lttng_event_rule_log4j_logging_get_filter(rule, &filter); + LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK || + status == LTTNG_EVENT_RULE_STATUS_UNSET); + + status = lttng_event_rule_log4j_logging_get_log_level_rule( + rule, &log_level_rule); + LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK || + status == LTTNG_EVENT_RULE_STATUS_UNSET); + + /* Open event rule log4j logging element. */ + ret = mi_lttng_writer_open_element( + writer, mi_lttng_element_event_rule_log4j_logging); + if (ret) { + goto mi_error; + } + + /* Name pattern. */ + ret = mi_lttng_writer_write_element_string(writer, + mi_lttng_element_event_rule_name_pattern, name_pattern); + if (ret) { + goto mi_error; + } + + /* Filter expression. */ + if (filter != NULL) { + ret = mi_lttng_writer_write_element_string(writer, + mi_lttng_element_event_rule_filter_expression, + filter); + if (ret) { + goto mi_error; + } + } + + /* Log level rule. */ + if (log_level_rule) { + ret_code = lttng_log_level_rule_mi_serialize( + log_level_rule, writer); + if (ret_code != LTTNG_OK) { + goto end; + } + } + + /* Close event rule log4j logging 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_log4j_logging_create(void) +{ + struct lttng_event_rule *rule = NULL; + struct lttng_event_rule_log4j_logging *tp_rule; + enum lttng_event_rule_status status; + + tp_rule = (lttng_event_rule_log4j_logging *) zmalloc(sizeof(struct lttng_event_rule_log4j_logging)); + if (!tp_rule) { + goto end; + } + + rule = &tp_rule->parent; + lttng_event_rule_init(&tp_rule->parent, LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING); + tp_rule->parent.validate = lttng_event_rule_log4j_logging_validate; + tp_rule->parent.serialize = lttng_event_rule_log4j_logging_serialize; + tp_rule->parent.equal = lttng_event_rule_log4j_logging_is_equal; + tp_rule->parent.destroy = lttng_event_rule_log4j_logging_destroy; + tp_rule->parent.generate_filter_bytecode = + lttng_event_rule_log4j_logging_generate_filter_bytecode; + tp_rule->parent.get_filter = + lttng_event_rule_log4j_logging_get_internal_filter; + tp_rule->parent.get_filter_bytecode = + lttng_event_rule_log4j_logging_get_internal_filter_bytecode; + tp_rule->parent.generate_exclusions = + lttng_event_rule_log4j_logging_generate_exclusions; + tp_rule->parent.hash = lttng_event_rule_log4j_logging_hash; + tp_rule->parent.generate_lttng_event = + lttng_event_rule_log4j_logging_generate_lttng_event; + tp_rule->parent.mi_serialize = lttng_event_rule_log4j_logging_mi_serialize; + + tp_rule->log_level_rule = NULL; + + /* Default pattern is '*'. */ + status = lttng_event_rule_log4j_logging_set_name_pattern(rule, "*"); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + lttng_event_rule_destroy(rule); + rule = NULL; + } + +end: + return rule; +} + +ssize_t lttng_event_rule_log4j_logging_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_log4j_logging_comm *log4j_logging_comm; + const char *pattern; + const char *filter_expression = NULL; + struct lttng_buffer_view current_buffer_view; + struct lttng_event_rule *rule = NULL; + struct lttng_log_level_rule *log_level_rule = NULL; + + if (!_event_rule) { + ret = -1; + goto end; + } + + current_buffer_view = lttng_buffer_view_from_view( + &view->buffer, offset, sizeof(*log4j_logging_comm)); + if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { + ERR("Failed to initialize from malformed event rule log4j_logging: buffer too short to contain header."); + ret = -1; + goto end; + } + + log4j_logging_comm = (typeof(log4j_logging_comm)) current_buffer_view.data; + + rule = lttng_event_rule_log4j_logging_create(); + if (!rule) { + ERR("Failed to create event rule log4j_logging."); + ret = -1; + goto end; + } + + /* Skip to payload. */ + offset += current_buffer_view.size; + + /* Map the pattern. */ + current_buffer_view = lttng_buffer_view_from_view( + &view->buffer, offset, log4j_logging_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, + log4j_logging_comm->pattern_len)) { + ret = -1; + goto end; + } + + /* Skip after the pattern. */ + offset += log4j_logging_comm->pattern_len; + + if (!log4j_logging_comm->filter_expression_len) { + goto skip_filter_expression; + } + + /* Map the filter_expression. */ + current_buffer_view = lttng_buffer_view_from_view(&view->buffer, offset, + log4j_logging_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, + log4j_logging_comm->filter_expression_len)) { + ret = -1; + goto end; + } + + /* Skip after the pattern. */ + offset += log4j_logging_comm->filter_expression_len; + +skip_filter_expression: + if (!log4j_logging_comm->log_level_rule_len) { + goto skip_log_level_rule; + } + + { + /* Map the log level rule. */ + struct lttng_payload_view current_payload_view = + lttng_payload_view_from_view(view, offset, + log4j_logging_comm->log_level_rule_len); + + ret = lttng_log_level_rule_create_from_payload( + ¤t_payload_view, &log_level_rule); + if (ret < 0) { + ret = -1; + goto end; + } + + LTTNG_ASSERT(ret == log4j_logging_comm->log_level_rule_len); + } + + /* Skip after the log level rule. */ + offset += log4j_logging_comm->log_level_rule_len; + +skip_log_level_rule: + + status = lttng_event_rule_log4j_logging_set_name_pattern(rule, pattern); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ERR("Failed to set event rule log4j_logging pattern."); + ret = -1; + goto end; + } + + if (filter_expression) { + status = lttng_event_rule_log4j_logging_set_filter( + rule, filter_expression); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ERR("Failed to set event rule log4j_logging pattern."); + ret = -1; + goto end; + } + } + + if (log_level_rule) { + status = lttng_event_rule_log4j_logging_set_log_level_rule( + rule, log_level_rule); + if (status != LTTNG_EVENT_RULE_STATUS_OK) { + ERR("Failed to set event rule log4j_logging log level rule."); + ret = -1; + goto end; + } + } + + *_event_rule = rule; + rule = NULL; + ret = offset; +end: + lttng_log_level_rule_destroy(log_level_rule); + lttng_event_rule_destroy(rule); + return ret; +} + +enum lttng_event_rule_status lttng_event_rule_log4j_logging_set_name_pattern( + struct lttng_event_rule *rule, const char *pattern) +{ + char *pattern_copy = NULL; + struct lttng_event_rule_log4j_logging *log4j_logging; + enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule) || !pattern || + strlen(pattern) == 0) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, 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(log4j_logging->pattern); + + log4j_logging->pattern = pattern_copy; + pattern_copy = NULL; +end: + return status; +} + +enum lttng_event_rule_status lttng_event_rule_log4j_logging_get_name_pattern( + const struct lttng_event_rule *rule, const char **pattern) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule) || !pattern) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + if (!log4j_logging->pattern) { + status = LTTNG_EVENT_RULE_STATUS_UNSET; + goto end; + } + + *pattern = log4j_logging->pattern; +end: + return status; +} + +enum lttng_event_rule_status lttng_event_rule_log4j_logging_set_filter( + struct lttng_event_rule *rule, const char *expression) +{ + char *expression_copy = NULL; + struct lttng_event_rule_log4j_logging *log4j_logging; + enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule) || !expression || + strlen(expression) == 0) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + expression_copy = strdup(expression); + if (!expression_copy) { + PERROR("Failed to copy filter expression"); + status = LTTNG_EVENT_RULE_STATUS_ERROR; + goto end; + } + + if (log4j_logging->filter_expression) { + free(log4j_logging->filter_expression); + } + + log4j_logging->filter_expression = expression_copy; + expression_copy = NULL; +end: + return status; +} + +enum lttng_event_rule_status lttng_event_rule_log4j_logging_get_filter( + const struct lttng_event_rule *rule, const char **expression) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule) || !expression) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + if (!log4j_logging->filter_expression) { + status = LTTNG_EVENT_RULE_STATUS_UNSET; + goto end; + } + + *expression = log4j_logging->filter_expression; +end: + return status; +} + +static bool log_level_rule_valid(const struct lttng_log_level_rule *rule) +{ + /* + * For both LOG4J custom log level are possible and can + * span the entire int32 range. + */ + return true; +} + +enum lttng_event_rule_status lttng_event_rule_log4j_logging_set_log_level_rule( + struct lttng_event_rule *rule, + const struct lttng_log_level_rule *log_level_rule) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; + struct lttng_log_level_rule *copy = NULL; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule)) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + + if (!log_level_rule_valid(log_level_rule)) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + copy = lttng_log_level_rule_copy(log_level_rule); + if (copy == NULL) { + status = LTTNG_EVENT_RULE_STATUS_ERROR; + goto end; + } + + if (log4j_logging->log_level_rule) { + lttng_log_level_rule_destroy(log4j_logging->log_level_rule); + } + + log4j_logging->log_level_rule = copy; + +end: + return status; +} + +enum lttng_event_rule_status lttng_event_rule_log4j_logging_get_log_level_rule( + const struct lttng_event_rule *rule, + const struct lttng_log_level_rule **log_level_rule + ) +{ + struct lttng_event_rule_log4j_logging *log4j_logging; + enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; + + if (!rule || !IS_LOG4J_LOGGING_EVENT_RULE(rule) || !log_level_rule) { + status = LTTNG_EVENT_RULE_STATUS_INVALID; + goto end; + } + + log4j_logging = container_of( + rule, struct lttng_event_rule_log4j_logging, parent); + if (log4j_logging->log_level_rule == NULL) { + status = LTTNG_EVENT_RULE_STATUS_UNSET; + goto end; + } + + *log_level_rule = log4j_logging->log_level_rule; +end: + return status; +}