--- /dev/null
+/*
+ * Copyright (C) 2019 - Jonathan Rajotte-Julien <jonathan.rajotte-julien@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License, version 2.1 only,
+ * as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <lttng/event-rule/event-rule-internal.h>
+#include <lttng/event-rule/uprobe-internal.h>
+#include <lttng/userspace-probe-internal.h>
+#include <common/macros.h>
+#include <common/error.h>
+#include <common/runas.h>
+#include <assert.h>
+
+#define IS_UPROBE_EVENT_RULE(rule) ( \
+ lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_UPROBE \
+ )
+
+static
+void lttng_event_rule_uprobe_destroy(struct lttng_event_rule *rule)
+{
+ struct lttng_event_rule_uprobe *uprobe;
+
+ uprobe = container_of(rule, struct lttng_event_rule_uprobe,
+ parent);
+
+ lttng_userspace_probe_location_destroy(uprobe->location);
+ free(uprobe->name);
+ free(uprobe);
+}
+
+static
+bool lttng_event_rule_uprobe_validate(
+ const struct lttng_event_rule *rule)
+{
+ bool valid = false;
+ struct lttng_event_rule_uprobe *uprobe;
+
+ if (!rule) {
+ goto end;
+ }
+
+ uprobe = container_of(rule, struct lttng_event_rule_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;
+ }
+
+ /* TODO should we validate the probe location? */
+
+ valid = true;
+end:
+ return valid;
+}
+
+static
+int lttng_event_rule_uprobe_serialize(
+ const struct lttng_event_rule *rule,
+ struct lttng_dynamic_buffer *buf,
+ int *fd_to_send)
+{
+ int ret;
+ size_t name_len, header_offset, size_before_probe;
+ struct lttng_event_rule_uprobe *uprobe;
+ struct lttng_event_rule_uprobe_comm uprobe_comm = { 0 };
+ struct lttng_event_rule_uprobe_comm *header;
+
+ if (!rule || !IS_UPROBE_EVENT_RULE(rule)) {
+ ret = -1;
+ goto end;
+ }
+
+ header_offset = buf->size;
+
+ DBG("Serializing uprobe event rule");
+ uprobe = container_of(
+ rule, struct lttng_event_rule_uprobe, parent);
+
+ name_len = strlen(uprobe->name) + 1;
+
+ uprobe_comm.name_len = name_len;
+
+ ret = lttng_dynamic_buffer_append(
+ buf, &uprobe_comm, sizeof(uprobe_comm));
+ if (ret) {
+ goto end;
+ }
+ ret = lttng_dynamic_buffer_append(buf, uprobe->name,
+ name_len);
+ if (ret) {
+ goto end;
+ }
+
+ size_before_probe = buf->size;
+
+ /* This serialize return the size taken in the buffer */
+ /* TODO: should all serialize standardise on this? */
+ ret = lttng_userspace_probe_location_serialize(
+ uprobe->location, buf, fd_to_send);
+ if (ret < 0) {
+ goto end;
+ }
+
+ /* Update the header regarding the probe size */
+ header = (struct lttng_event_rule_uprobe_comm *) ((char *) buf->data + header_offset);
+ header->location_len = buf->size - size_before_probe;
+
+ ret = 0;
+
+end:
+ return ret;
+}
+
+static
+bool lttng_event_rule_uprobe_is_equal(const struct lttng_event_rule *_a,
+ const struct lttng_event_rule *_b)
+{
+ bool is_equal = false;
+ struct lttng_event_rule_uprobe *a, *b;
+
+ a = container_of(_a, struct lttng_event_rule_uprobe, parent);
+ b = container_of(_b, struct lttng_event_rule_uprobe, parent);
+
+ /* uprobe is invalid if this is not true */
+ assert(a->name);
+ assert(b->name);
+ if (strcmp(a->name, b->name)) {
+ goto end;
+ }
+
+ assert(a->location);
+ 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_uprobe_populate(struct lttng_event_rule *rule, uid_t uid, gid_t gid)
+{
+ /* Nothing to do */
+ return LTTNG_OK;
+}
+
+static const char *lttng_event_rule_uprobe_get_filter(
+ const struct lttng_event_rule *rule)
+{
+ /* Unsupported */
+ return NULL;
+}
+
+static const struct lttng_filter_bytecode *
+lttng_event_rule_uprobe_get_filter_bytecode(const struct lttng_event_rule *rule)
+{
+ /* Unsupported */
+ return NULL;
+}
+
+static
+struct lttng_event_exclusion *lttng_event_rule_uprobe_generate_exclusions(struct lttng_event_rule *rule)
+{
+ /* Unsupported */
+ return NULL;
+}
+
+struct lttng_event_rule *lttng_event_rule_uprobe_create()
+{
+ struct lttng_event_rule_uprobe *rule;
+
+ rule = zmalloc(sizeof(struct lttng_event_rule_uprobe));
+ if (!rule) {
+ return NULL;
+ }
+
+ lttng_event_rule_init(&rule->parent, LTTNG_EVENT_RULE_TYPE_UPROBE);
+ rule->parent.validate = lttng_event_rule_uprobe_validate;
+ rule->parent.serialize = lttng_event_rule_uprobe_serialize;
+ rule->parent.equal = lttng_event_rule_uprobe_is_equal;
+ rule->parent.destroy = lttng_event_rule_uprobe_destroy;
+ rule->parent.populate = lttng_event_rule_uprobe_populate;
+ rule->parent.get_filter = lttng_event_rule_uprobe_get_filter;
+ rule->parent.get_filter_bytecode = lttng_event_rule_uprobe_get_filter_bytecode;
+ rule->parent.generate_exclusions = lttng_event_rule_uprobe_generate_exclusions;
+ return &rule->parent;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_event_rule_uprobe_create_from_buffer(
+ const struct lttng_buffer_view *view,
+ struct lttng_event_rule **_event_rule)
+{
+ ssize_t ret, offset = 0;
+ const struct lttng_event_rule_uprobe_comm *uprobe_comm;
+ const char *name;
+ struct lttng_buffer_view current_view;
+ struct lttng_event_rule *rule = NULL;
+ struct lttng_userspace_probe_location *location;
+ struct lttng_event_rule_uprobe *uprobe;
+
+ if (!_event_rule) {
+ ret = -1;
+ goto end;
+ }
+
+ if (view->size < sizeof(*uprobe_comm)) {
+ ERR("Failed to initialize from malformed event rule uprobe: buffer too short to contain header");
+ ret = -1;
+ goto end;
+ }
+
+ current_view = lttng_buffer_view_from_view(view, offset, sizeof(*uprobe_comm));
+ uprobe_comm = (typeof(uprobe_comm)) current_view.data;
+
+ if(!uprobe_comm) {
+ ret = -1;
+ goto end;
+ }
+
+ rule = lttng_event_rule_uprobe_create();
+ if (!rule) {
+ ERR("Failed to create event rule uprobe");
+ ret = -1;
+ goto end;
+ }
+
+ /* Skip to payload */
+ offset += current_view.size;
+
+ /* Map the name */
+ current_view = lttng_buffer_view_from_view(view, offset, uprobe_comm->name_len);
+ name = current_view.data;
+ if (!name) {
+ ret = -1;
+ goto end;
+ }
+
+ if (uprobe_comm->name_len == 1 ||
+ name[uprobe_comm->name_len - 1] != '\0' ||
+ strlen(name) != uprobe_comm->name_len - 1) {
+ /*
+ * Check that the name is not NULL, is NULL-terminated, and
+ * does not contain a NULL before the last byte.
+ */
+ ret = -1;
+ goto end;
+ }
+
+ /* Skip after the name */
+ offset += uprobe_comm->name_len;
+
+ /* Map the location */
+ current_view = lttng_buffer_view_from_view(view, offset, uprobe_comm->location_len);
+ ret = lttng_userspace_probe_location_create_from_buffer(¤t_view, &location);
+ if (ret < 0) {
+ ret = -1;
+ goto end;
+ }
+
+ assert(ret == uprobe_comm->location_len);
+
+ /* Skip after the location */
+ offset += uprobe_comm->location_len;
+
+ uprobe = container_of(rule, struct lttng_event_rule_uprobe, parent);
+ uprobe->location = location;
+
+ (void) lttng_event_rule_uprobe_set_name(rule, name);
+
+ if (!lttng_event_rule_uprobe_validate(rule)) {
+ 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_uprobe_set_location(
+ struct lttng_event_rule *rule,
+ const struct lttng_userspace_probe_location *location)
+{
+ struct lttng_userspace_probe_location *location_copy = NULL;
+ struct lttng_event_rule_uprobe *uprobe;
+ 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;
+ }
+
+ uprobe = container_of(rule, struct lttng_event_rule_uprobe,
+ parent);
+ location_copy = lttng_userspace_probe_location_copy(location);
+ if (!location_copy) {
+ status = LTTNG_EVENT_RULE_STATUS_ERROR;
+ goto end;
+ }
+
+ if (uprobe->location) {
+ lttng_userspace_probe_location_destroy(uprobe->location);
+ }
+
+ uprobe->location = location_copy;
+ location_copy = NULL;
+end:
+ lttng_userspace_probe_location_destroy(location_copy);
+ return status;
+}
+
+enum lttng_event_rule_status lttng_event_rule_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_uprobe_get_location_no_const(rule);
+ if (!*location) {
+ status = LTTNG_EVENT_RULE_STATUS_UNSET;
+ goto end;
+ }
+
+end:
+ return status;
+
+}
+
+LTTNG_HIDDEN
+struct lttng_userspace_probe_location *
+lttng_event_rule_uprobe_get_location_no_const(
+ const struct lttng_event_rule *rule)
+{
+ struct lttng_event_rule_uprobe *uprobe;
+ assert(rule);
+ uprobe = container_of(rule, struct lttng_event_rule_uprobe,
+ parent);
+
+ return uprobe->location;
+}
+
+enum lttng_event_rule_status lttng_event_rule_uprobe_set_name(
+ struct lttng_event_rule *rule, const char *name)
+{
+ char *name_copy = NULL;
+ struct lttng_event_rule_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_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_uprobe_get_name(
+ const struct lttng_event_rule *rule, const char **name)
+{
+ struct lttng_event_rule_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_uprobe,
+ parent);
+ if (!uprobe->name) {
+ status = LTTNG_EVENT_RULE_STATUS_UNSET;
+ goto end;
+ }
+
+ *name = uprobe->name;
+end:
+ return status;
+}
projects / lttng-tools.git / blobdiff