X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Fevent-rule%2Fkernel-kprobe.c;fp=src%2Fcommon%2Fevent-rule%2Fkernel-kprobe.c;h=0000000000000000000000000000000000000000;hp=872d03a7e40543df30b8bb35c59e4411aef763f1;hb=a6bc4ca9d659caf016ef932fcd944029737ac57c;hpb=97535efaa975ca52bf02c2d5e76351bfd2e3defa diff --git a/src/common/event-rule/kernel-kprobe.c b/src/common/event-rule/kernel-kprobe.c deleted file mode 100644 index 872d03a7e..000000000 --- a/src/common/event-rule/kernel-kprobe.c +++ /dev/null @@ -1,495 +0,0 @@ -/* - * 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 -#include -#include - -#define IS_KPROBE_EVENT_RULE(rule) \ - (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE) - -#if (LTTNG_SYMBOL_NAME_LEN == 256) -#define LTTNG_SYMBOL_NAME_LEN_SCANF_IS_A_BROKEN_API "255" -#endif - -static void lttng_event_rule_kernel_kprobe_destroy(struct lttng_event_rule *rule) -{ - struct lttng_event_rule_kernel_kprobe *kprobe; - - kprobe = container_of(rule, struct lttng_event_rule_kernel_kprobe, parent); - - lttng_kernel_probe_location_destroy(kprobe->location); - free(kprobe->name); - free(kprobe); -} - -static bool lttng_event_rule_kernel_kprobe_validate( - const struct lttng_event_rule *rule) -{ - bool valid = false; - struct lttng_event_rule_kernel_kprobe *kprobe; - - if (!rule) { - goto end; - } - - kprobe = container_of(rule, struct lttng_event_rule_kernel_kprobe, parent); - - /* Required field. */ - if (!kprobe->name) { - ERR("Invalid name event rule: a name must be set."); - goto end; - } - - /* Required field. */ - if(!kprobe->location) { - ERR("Invalid name event rule: a location must be set."); - goto end; - } - - valid = true; -end: - return valid; -} - -static int lttng_event_rule_kernel_kprobe_serialize( - const struct lttng_event_rule *rule, - struct lttng_payload *payload) -{ - int ret; - size_t name_len, header_offset, size_before_location; - struct lttng_event_rule_kernel_kprobe *kprobe; - struct lttng_event_rule_kernel_kprobe_comm kprobe_comm; - struct lttng_event_rule_kernel_kprobe_comm *header; - - if (!rule || !IS_KPROBE_EVENT_RULE(rule)) { - ret = -1; - goto end; - } - - header_offset = payload->buffer.size; - - DBG("Serializing kprobe event rule."); - kprobe = container_of(rule, struct lttng_event_rule_kernel_kprobe, parent); - - name_len = strlen(kprobe->name) + 1; - kprobe_comm.name_len = name_len; - - ret = lttng_dynamic_buffer_append( - &payload->buffer, &kprobe_comm, sizeof(kprobe_comm)); - if (ret) { - goto end; - } - - ret = lttng_dynamic_buffer_append(&payload->buffer, kprobe->name, name_len); - if (ret) { - goto end; - } - - size_before_location = payload->buffer.size; - - ret = lttng_kernel_probe_location_serialize(kprobe->location, payload); - if (ret < 0) { - goto end; - } - - /* Update the header regarding the probe size. */ - header = (struct lttng_event_rule_kernel_kprobe_comm*) ( - (char *) payload->buffer.data + header_offset); - header->location_len = payload->buffer.size - size_before_location; - - ret = 0; - -end: - return ret; -} - -static bool lttng_event_rule_kernel_kprobe_is_equal(const struct lttng_event_rule *_a, - const struct lttng_event_rule *_b) -{ - bool is_equal = false; - struct lttng_event_rule_kernel_kprobe *a, *b; - - a = container_of(_a, struct lttng_event_rule_kernel_kprobe, parent); - b = container_of(_b, struct lttng_event_rule_kernel_kprobe, parent); - - /* Quick checks */ - if (!!a->name != !!b->name) { - goto end; - } - - /* Long check */ - LTTNG_ASSERT(a->name); - LTTNG_ASSERT(b->name); - if (strcmp(a->name, b->name)) { - goto end; - } - - is_equal = lttng_kernel_probe_location_is_equal( - a->location, b->location); -end: - return is_equal; -} - -static enum lttng_error_code lttng_event_rule_kernel_kprobe_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_kprobe_get_filter( - const struct lttng_event_rule *rule) -{ - /* Not supported. */ - return NULL; -} - -static const struct lttng_bytecode * -lttng_event_rule_kernel_kprobe_get_filter_bytecode(const struct lttng_event_rule *rule) -{ - /* Not supported. */ - return NULL; -} - -static enum lttng_event_rule_generate_exclusions_status -lttng_event_rule_kernel_kprobe_generate_exclusions(const struct lttng_event_rule *rule, - struct lttng_event_exclusion **exclusions) -{ - /* Not supported. */ - *exclusions = NULL; - return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE; -} - -static unsigned long -lttng_event_rule_kernel_kprobe_hash( - const struct lttng_event_rule *rule) -{ - unsigned long hash; - struct lttng_event_rule_kernel_kprobe *krule = - container_of(rule, typeof(*krule), parent); - - hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE, - lttng_ht_seed); - hash ^= hash_key_str(krule->name, lttng_ht_seed); - hash ^= lttng_kernel_probe_location_hash(krule->location); - - return hash; -} - -static -int kernel_probe_set_location( - struct lttng_event_rule_kernel_kprobe *kprobe, - const struct lttng_kernel_probe_location *location) -{ - int ret; - struct lttng_kernel_probe_location *location_copy = NULL; - - if (!kprobe || !location || kprobe->location) { - ret = -1; - goto end; - } - - location_copy = lttng_kernel_probe_location_copy(location); - if (!location_copy) { - ret = -1; - goto end; - } - - kprobe->location = location_copy; - location_copy = NULL; - ret = 0; -end: - lttng_kernel_probe_location_destroy(location_copy); - return ret; -} - -static -enum lttng_error_code lttng_event_rule_kernel_kprobe_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_kernel_probe_location *location = NULL; - - LTTNG_ASSERT(rule); - LTTNG_ASSERT(writer); - LTTNG_ASSERT(IS_KPROBE_EVENT_RULE(rule)); - - status = lttng_event_rule_kernel_kprobe_get_event_name( - rule, &event_name); - LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK); - LTTNG_ASSERT(event_name); - - status = lttng_event_rule_kernel_kprobe_get_location(rule, &location); - LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK); - LTTNG_ASSERT(location); - - /* Open event rule kernel kprobe element. */ - ret = mi_lttng_writer_open_element( - writer, mi_lttng_element_event_rule_kernel_kprobe); - if (ret) { - goto mi_error; - } - - /* 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_kernel_probe_location_mi_serialize(location, writer); - if (ret_code != LTTNG_OK) { - goto end; - } - - /* Close event rule kernel kprobe 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_kprobe_create( - const struct lttng_kernel_probe_location *location) -{ - struct lttng_event_rule *rule = NULL; - struct lttng_event_rule_kernel_kprobe *krule; - - krule = zmalloc(sizeof(struct lttng_event_rule_kernel_kprobe)); - if (!krule) { - goto end; - } - - rule = &krule->parent; - lttng_event_rule_init(&krule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_KPROBE); - krule->parent.validate = lttng_event_rule_kernel_kprobe_validate; - krule->parent.serialize = lttng_event_rule_kernel_kprobe_serialize; - krule->parent.equal = lttng_event_rule_kernel_kprobe_is_equal; - krule->parent.destroy = lttng_event_rule_kernel_kprobe_destroy; - krule->parent.generate_filter_bytecode = - lttng_event_rule_kernel_kprobe_generate_filter_bytecode; - krule->parent.get_filter = lttng_event_rule_kernel_kprobe_get_filter; - krule->parent.get_filter_bytecode = - lttng_event_rule_kernel_kprobe_get_filter_bytecode; - krule->parent.generate_exclusions = - lttng_event_rule_kernel_kprobe_generate_exclusions; - krule->parent.hash = lttng_event_rule_kernel_kprobe_hash; - krule->parent.mi_serialize = lttng_event_rule_kernel_kprobe_mi_serialize; - - if (kernel_probe_set_location(krule, location)) { - lttng_event_rule_destroy(rule); - rule = NULL; - } - -end: - return rule; -} - -ssize_t lttng_event_rule_kernel_kprobe_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_kprobe_comm *kprobe_comm; - const char *name; - struct lttng_buffer_view current_buffer_view; - struct lttng_event_rule *rule = NULL; - struct lttng_kernel_probe_location *location = NULL; - - if (!_event_rule) { - ret = -1; - goto end; - } - - current_buffer_view = lttng_buffer_view_from_view( - &view->buffer, offset, sizeof(*kprobe_comm)); - if (!lttng_buffer_view_is_valid(¤t_buffer_view)) { - ERR("Failed to initialize from malformed event rule kprobe: buffer too short to contain header."); - ret = -1; - goto end; - } - - kprobe_comm = (typeof(kprobe_comm)) current_buffer_view.data; - - /* Skip to payload */ - offset += current_buffer_view.size; - - { - /* Map the name. */ - struct lttng_payload_view current_payload_view = - lttng_payload_view_from_view(view, offset, - kprobe_comm->name_len); - - if (!lttng_payload_view_is_valid(¤t_payload_view)) { - ret = -1; - goto end; - } - - name = current_payload_view.buffer.data; - if (!lttng_buffer_view_contains_string( - ¤t_payload_view.buffer, name, - kprobe_comm->name_len)) { - ret = -1; - goto end; - } - } - - /* Skip after the name. */ - offset += kprobe_comm->name_len; - - /* Map the kernel probe location. */ - { - struct lttng_payload_view current_payload_view = - lttng_payload_view_from_view(view, offset, - kprobe_comm->location_len); - - if (!lttng_payload_view_is_valid(¤t_payload_view)) { - ret = -1; - goto end; - } - - ret = lttng_kernel_probe_location_create_from_payload( - ¤t_payload_view, &location); - if (ret < 0) { - ret = -1; - goto end; - } - } - - if (ret != kprobe_comm->location_len) { - ret = -1; - goto end; - } - - /* Skip after the location */ - offset += kprobe_comm->location_len; - - rule = lttng_event_rule_kernel_kprobe_create(location); - if (!rule) { - ERR("Failed to create event rule kprobe."); - ret = -1; - goto end; - } - - status = lttng_event_rule_kernel_kprobe_set_event_name(rule, name); - if (status != LTTNG_EVENT_RULE_STATUS_OK) { - ERR("Failed to set event rule kprobe name."); - ret = -1; - goto end; - } - - *_event_rule = rule; - rule = NULL; - ret = offset; -end: - lttng_kernel_probe_location_destroy(location); - lttng_event_rule_destroy(rule); - return ret; -} - -enum lttng_event_rule_status lttng_event_rule_kernel_kprobe_get_location( - const struct lttng_event_rule *rule, - const struct lttng_kernel_probe_location **location) -{ - enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; - struct lttng_event_rule_kernel_kprobe *kprobe; - - if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !location) { - status = LTTNG_EVENT_RULE_STATUS_INVALID; - goto end; - } - - kprobe = container_of(rule, struct lttng_event_rule_kernel_kprobe, parent); - *location = kprobe->location; - - if (!*location) { - status = LTTNG_EVENT_RULE_STATUS_UNSET; - goto end; - } - -end: - return status; -} - -enum lttng_event_rule_status lttng_event_rule_kernel_kprobe_set_event_name( - struct lttng_event_rule *rule, const char *name) -{ - char *name_copy = NULL; - struct lttng_event_rule_kernel_kprobe *kprobe; - enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; - - if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !name || - strlen(name) == 0) { - status = LTTNG_EVENT_RULE_STATUS_INVALID; - goto end; - } - - kprobe = container_of(rule, struct lttng_event_rule_kernel_kprobe, parent); - name_copy = strdup(name); - if (!name_copy) { - status = LTTNG_EVENT_RULE_STATUS_ERROR; - goto end; - } - - free(kprobe->name); - - kprobe->name = name_copy; - name_copy = NULL; -end: - return status; -} - -enum lttng_event_rule_status lttng_event_rule_kernel_kprobe_get_event_name( - const struct lttng_event_rule *rule, const char **name) -{ - struct lttng_event_rule_kernel_kprobe *kprobe; - enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK; - - if (!rule || !IS_KPROBE_EVENT_RULE(rule) || !name) { - status = LTTNG_EVENT_RULE_STATUS_INVALID; - goto end; - } - - kprobe = container_of(rule, struct lttng_event_rule_kernel_kprobe, parent); - if (!kprobe->name) { - status = LTTNG_EVENT_RULE_STATUS_UNSET; - goto end; - } - - *name = kprobe->name; -end: - return status; -}