| 1 | /* |
| 2 | * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include <lttng/trigger/trigger-internal.h> |
| 9 | #include <lttng/condition/condition-internal.h> |
| 10 | #include <lttng/action/action-internal.h> |
| 11 | #include <common/error.h> |
| 12 | #include <assert.h> |
| 13 | |
| 14 | LTTNG_HIDDEN |
| 15 | bool lttng_trigger_validate(struct lttng_trigger *trigger) |
| 16 | { |
| 17 | bool valid; |
| 18 | |
| 19 | if (!trigger) { |
| 20 | valid = false; |
| 21 | goto end; |
| 22 | } |
| 23 | |
| 24 | valid = lttng_condition_validate(trigger->condition) && |
| 25 | lttng_action_validate(trigger->action); |
| 26 | end: |
| 27 | return valid; |
| 28 | } |
| 29 | |
| 30 | struct lttng_trigger *lttng_trigger_create( |
| 31 | struct lttng_condition *condition, |
| 32 | struct lttng_action *action) |
| 33 | { |
| 34 | struct lttng_trigger *trigger = NULL; |
| 35 | |
| 36 | if (!condition || !action) { |
| 37 | goto end; |
| 38 | } |
| 39 | |
| 40 | trigger = zmalloc(sizeof(struct lttng_trigger)); |
| 41 | if (!trigger) { |
| 42 | goto end; |
| 43 | } |
| 44 | |
| 45 | trigger->condition = condition; |
| 46 | trigger->action = action; |
| 47 | end: |
| 48 | return trigger; |
| 49 | } |
| 50 | |
| 51 | struct lttng_condition *lttng_trigger_get_condition( |
| 52 | struct lttng_trigger *trigger) |
| 53 | { |
| 54 | return trigger ? trigger->condition : NULL; |
| 55 | } |
| 56 | |
| 57 | LTTNG_HIDDEN |
| 58 | const struct lttng_condition *lttng_trigger_get_const_condition( |
| 59 | const struct lttng_trigger *trigger) |
| 60 | { |
| 61 | return trigger->condition; |
| 62 | } |
| 63 | |
| 64 | struct lttng_action *lttng_trigger_get_action( |
| 65 | struct lttng_trigger *trigger) |
| 66 | { |
| 67 | return trigger ? trigger->action : NULL; |
| 68 | } |
| 69 | |
| 70 | LTTNG_HIDDEN |
| 71 | const struct lttng_action *lttng_trigger_get_const_action( |
| 72 | const struct lttng_trigger *trigger) |
| 73 | { |
| 74 | return trigger->action; |
| 75 | } |
| 76 | |
| 77 | void lttng_trigger_destroy(struct lttng_trigger *trigger) |
| 78 | { |
| 79 | if (!trigger) { |
| 80 | return; |
| 81 | } |
| 82 | |
| 83 | free(trigger); |
| 84 | } |
| 85 | |
| 86 | LTTNG_HIDDEN |
| 87 | ssize_t lttng_trigger_create_from_buffer( |
| 88 | const struct lttng_buffer_view *src_view, |
| 89 | struct lttng_trigger **trigger) |
| 90 | { |
| 91 | ssize_t ret, offset = 0, condition_size, action_size; |
| 92 | struct lttng_condition *condition = NULL; |
| 93 | struct lttng_action *action = NULL; |
| 94 | const struct lttng_trigger_comm *trigger_comm; |
| 95 | struct lttng_buffer_view condition_view; |
| 96 | struct lttng_buffer_view action_view; |
| 97 | |
| 98 | if (!src_view || !trigger) { |
| 99 | ret = -1; |
| 100 | goto end; |
| 101 | } |
| 102 | |
| 103 | /* lttng_trigger_comm header */ |
| 104 | trigger_comm = (const struct lttng_trigger_comm *) src_view->data; |
| 105 | offset += sizeof(*trigger_comm); |
| 106 | |
| 107 | condition_view = lttng_buffer_view_from_view(src_view, offset, -1); |
| 108 | |
| 109 | /* struct lttng_condition */ |
| 110 | condition_size = lttng_condition_create_from_buffer(&condition_view, |
| 111 | &condition); |
| 112 | if (condition_size < 0) { |
| 113 | ret = condition_size; |
| 114 | goto end; |
| 115 | } |
| 116 | offset += condition_size; |
| 117 | |
| 118 | /* struct lttng_action */ |
| 119 | action_view = lttng_buffer_view_from_view(src_view, offset, -1); |
| 120 | action_size = lttng_action_create_from_buffer(&action_view, &action); |
| 121 | if (action_size < 0) { |
| 122 | ret = action_size; |
| 123 | goto end; |
| 124 | } |
| 125 | offset += action_size; |
| 126 | |
| 127 | /* Unexpected size of inner-elements; the buffer is corrupted. */ |
| 128 | if ((ssize_t) trigger_comm->length != condition_size + action_size) { |
| 129 | ret = -1; |
| 130 | goto error; |
| 131 | } |
| 132 | |
| 133 | *trigger = lttng_trigger_create(condition, action); |
| 134 | if (!*trigger) { |
| 135 | ret = -1; |
| 136 | goto error; |
| 137 | } |
| 138 | ret = offset; |
| 139 | end: |
| 140 | return ret; |
| 141 | error: |
| 142 | lttng_condition_destroy(condition); |
| 143 | lttng_action_destroy(action); |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Both elements are stored contiguously, see their "*_comm" structure |
| 149 | * for the detailed format. |
| 150 | */ |
| 151 | LTTNG_HIDDEN |
| 152 | int lttng_trigger_serialize(struct lttng_trigger *trigger, |
| 153 | struct lttng_dynamic_buffer *buf) |
| 154 | { |
| 155 | int ret; |
| 156 | size_t header_offset, size_before_payload; |
| 157 | struct lttng_trigger_comm trigger_comm = { 0 }; |
| 158 | struct lttng_trigger_comm *header; |
| 159 | |
| 160 | header_offset = buf->size; |
| 161 | ret = lttng_dynamic_buffer_append(buf, &trigger_comm, |
| 162 | sizeof(trigger_comm)); |
| 163 | if (ret) { |
| 164 | goto end; |
| 165 | } |
| 166 | |
| 167 | size_before_payload = buf->size; |
| 168 | ret = lttng_condition_serialize(trigger->condition, buf); |
| 169 | if (ret) { |
| 170 | goto end; |
| 171 | } |
| 172 | |
| 173 | ret = lttng_action_serialize(trigger->action, buf); |
| 174 | if (ret) { |
| 175 | goto end; |
| 176 | } |
| 177 | |
| 178 | /* Update payload size. */ |
| 179 | header = (struct lttng_trigger_comm *) ((char *) buf->data + header_offset); |
| 180 | header->length = buf->size - size_before_payload; |
| 181 | end: |
| 182 | return ret; |
| 183 | } |