| 1 | /* |
| 2 | * Copyright (C) 2019 Jonathan Rajotte |
| 3 | * <jonathan.rajotte-julien@efficios.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: LGPL-2.1-only |
| 6 | * |
| 7 | */ |
| 8 | |
| 9 | #include <assert.h> |
| 10 | #include <common/error.h> |
| 11 | #include <common/macros.h> |
| 12 | #include <common/payload.h> |
| 13 | #include <common/payload-view.h> |
| 14 | #include <common/hashtable/hashtable.h> |
| 15 | #include <common/hashtable/utils.h> |
| 16 | #include <lttng/event-rule/event-rule-internal.h> |
| 17 | #include <lttng/event-rule/kprobe-internal.h> |
| 18 | #include <lttng/event-rule/syscall-internal.h> |
| 19 | #include <lttng/event-rule/tracepoint-internal.h> |
| 20 | #include <lttng/event-rule/uprobe-internal.h> |
| 21 | #include <stdbool.h> |
| 22 | |
| 23 | enum lttng_event_rule_type lttng_event_rule_get_type( |
| 24 | const struct lttng_event_rule *event_rule) |
| 25 | { |
| 26 | return event_rule ? event_rule->type : LTTNG_EVENT_RULE_TYPE_UNKNOWN; |
| 27 | } |
| 28 | |
| 29 | LTTNG_HIDDEN |
| 30 | enum lttng_domain_type lttng_event_rule_get_domain_type( |
| 31 | const struct lttng_event_rule *event_rule) |
| 32 | { |
| 33 | enum lttng_domain_type domain_type = LTTNG_DOMAIN_NONE; |
| 34 | |
| 35 | switch (lttng_event_rule_get_type(event_rule)) { |
| 36 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 37 | { |
| 38 | enum lttng_event_rule_status status; |
| 39 | status = lttng_event_rule_tracepoint_get_domain_type(event_rule, &domain_type); |
| 40 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); |
| 41 | break; |
| 42 | } |
| 43 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 44 | case LTTNG_EVENT_RULE_TYPE_KPROBE: |
| 45 | case LTTNG_EVENT_RULE_TYPE_KRETPROBE: |
| 46 | case LTTNG_EVENT_RULE_TYPE_UPROBE: |
| 47 | domain_type = LTTNG_DOMAIN_KERNEL; |
| 48 | break; |
| 49 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: |
| 50 | domain_type = LTTNG_DOMAIN_NONE; |
| 51 | break; |
| 52 | } |
| 53 | |
| 54 | return domain_type; |
| 55 | } |
| 56 | |
| 57 | static void lttng_event_rule_release(struct urcu_ref *ref) |
| 58 | { |
| 59 | struct lttng_event_rule *event_rule = |
| 60 | container_of(ref, typeof(*event_rule), ref); |
| 61 | |
| 62 | assert(event_rule->destroy); |
| 63 | event_rule->destroy(event_rule); |
| 64 | } |
| 65 | |
| 66 | void lttng_event_rule_destroy(struct lttng_event_rule *event_rule) |
| 67 | { |
| 68 | lttng_event_rule_put(event_rule); |
| 69 | } |
| 70 | |
| 71 | LTTNG_HIDDEN |
| 72 | bool lttng_event_rule_validate(const struct lttng_event_rule *event_rule) |
| 73 | { |
| 74 | bool valid; |
| 75 | |
| 76 | if (!event_rule) { |
| 77 | valid = false; |
| 78 | goto end; |
| 79 | } |
| 80 | |
| 81 | if (!event_rule->validate) { |
| 82 | /* Sub-class guarantees that it can never be invalid. */ |
| 83 | valid = true; |
| 84 | goto end; |
| 85 | } |
| 86 | |
| 87 | valid = event_rule->validate(event_rule); |
| 88 | end: |
| 89 | return valid; |
| 90 | } |
| 91 | |
| 92 | LTTNG_HIDDEN |
| 93 | int lttng_event_rule_serialize(const struct lttng_event_rule *event_rule, |
| 94 | struct lttng_payload *payload) |
| 95 | { |
| 96 | int ret; |
| 97 | struct lttng_event_rule_comm event_rule_comm = {}; |
| 98 | |
| 99 | if (!event_rule) { |
| 100 | ret = -1; |
| 101 | goto end; |
| 102 | } |
| 103 | |
| 104 | event_rule_comm.event_rule_type = (int8_t) event_rule->type; |
| 105 | |
| 106 | ret = lttng_dynamic_buffer_append( |
| 107 | &payload->buffer, &event_rule_comm, sizeof(event_rule_comm)); |
| 108 | if (ret) { |
| 109 | goto end; |
| 110 | } |
| 111 | |
| 112 | ret = event_rule->serialize(event_rule, payload); |
| 113 | if (ret) { |
| 114 | goto end; |
| 115 | } |
| 116 | end: |
| 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | LTTNG_HIDDEN |
| 121 | bool lttng_event_rule_is_equal(const struct lttng_event_rule *a, |
| 122 | const struct lttng_event_rule *b) |
| 123 | { |
| 124 | bool is_equal = false; |
| 125 | |
| 126 | if (!a || !b) { |
| 127 | goto end; |
| 128 | } |
| 129 | |
| 130 | if (a->type != b->type) { |
| 131 | goto end; |
| 132 | } |
| 133 | |
| 134 | if (a == b) { |
| 135 | is_equal = true; |
| 136 | goto end; |
| 137 | } |
| 138 | |
| 139 | is_equal = a->equal ? a->equal(a, b) : true; |
| 140 | end: |
| 141 | return is_equal; |
| 142 | } |
| 143 | |
| 144 | LTTNG_HIDDEN |
| 145 | ssize_t lttng_event_rule_create_from_payload( |
| 146 | struct lttng_payload_view *view, |
| 147 | struct lttng_event_rule **event_rule) |
| 148 | { |
| 149 | ssize_t ret, consumed = 0; |
| 150 | event_rule_create_from_payload_cb create_from_payload = NULL; |
| 151 | const struct lttng_event_rule_comm *event_rule_comm; |
| 152 | const struct lttng_payload_view event_rule_comm_view = |
| 153 | lttng_payload_view_from_view( |
| 154 | view, 0, sizeof(*event_rule_comm)); |
| 155 | |
| 156 | if (!view || !event_rule) { |
| 157 | ret = -1; |
| 158 | goto end; |
| 159 | } |
| 160 | |
| 161 | if (!lttng_payload_view_is_valid(&event_rule_comm_view)) { |
| 162 | ret = -1; |
| 163 | goto end; |
| 164 | } |
| 165 | |
| 166 | DBG("Deserializing event_rule from payload"); |
| 167 | event_rule_comm = (const struct lttng_event_rule_comm *) event_rule_comm_view.buffer.data; |
| 168 | consumed += sizeof(*event_rule_comm); |
| 169 | |
| 170 | switch ((enum lttng_event_rule_type) event_rule_comm->event_rule_type) { |
| 171 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 172 | create_from_payload = |
| 173 | lttng_event_rule_tracepoint_create_from_payload; |
| 174 | break; |
| 175 | case LTTNG_EVENT_RULE_TYPE_KPROBE: |
| 176 | create_from_payload = lttng_event_rule_kprobe_create_from_payload; |
| 177 | break; |
| 178 | case LTTNG_EVENT_RULE_TYPE_KRETPROBE: |
| 179 | /* TODO */ |
| 180 | break; |
| 181 | case LTTNG_EVENT_RULE_TYPE_UPROBE: |
| 182 | create_from_payload = lttng_event_rule_uprobe_create_from_payload; |
| 183 | break; |
| 184 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 185 | create_from_payload = |
| 186 | lttng_event_rule_syscall_create_from_payload; |
| 187 | break; |
| 188 | default: |
| 189 | ERR("Attempted to create event rule of unknown type (%i)", |
| 190 | (int) event_rule_comm->event_rule_type); |
| 191 | ret = -1; |
| 192 | goto end; |
| 193 | } |
| 194 | |
| 195 | assert(create_from_payload); |
| 196 | |
| 197 | { |
| 198 | struct lttng_payload_view child_view = |
| 199 | lttng_payload_view_from_view( |
| 200 | view, consumed, -1); |
| 201 | |
| 202 | ret = create_from_payload(&child_view, event_rule); |
| 203 | if (ret < 0) { |
| 204 | goto end; |
| 205 | } |
| 206 | |
| 207 | consumed += ret; |
| 208 | } |
| 209 | |
| 210 | if (!lttng_event_rule_validate(*event_rule)) { |
| 211 | ret = -1; |
| 212 | goto end; |
| 213 | } |
| 214 | |
| 215 | ret = consumed; |
| 216 | end: |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | LTTNG_HIDDEN |
| 221 | void lttng_event_rule_init(struct lttng_event_rule *event_rule, |
| 222 | enum lttng_event_rule_type type) |
| 223 | { |
| 224 | urcu_ref_init(&event_rule->ref); |
| 225 | event_rule->type = type; |
| 226 | } |
| 227 | |
| 228 | LTTNG_HIDDEN |
| 229 | bool lttng_event_rule_get(struct lttng_event_rule *event_rule) |
| 230 | { |
| 231 | return urcu_ref_get_unless_zero(&event_rule->ref); |
| 232 | } |
| 233 | |
| 234 | LTTNG_HIDDEN |
| 235 | void lttng_event_rule_put(struct lttng_event_rule *event_rule) |
| 236 | { |
| 237 | if (!event_rule) { |
| 238 | return; |
| 239 | } |
| 240 | |
| 241 | assert(event_rule->ref.refcount); |
| 242 | urcu_ref_put(&event_rule->ref, lttng_event_rule_release); |
| 243 | } |
| 244 | |
| 245 | LTTNG_HIDDEN |
| 246 | enum lttng_error_code lttng_event_rule_generate_filter_bytecode( |
| 247 | struct lttng_event_rule *rule, |
| 248 | const struct lttng_credentials *creds) |
| 249 | { |
| 250 | assert(rule->generate_filter_bytecode); |
| 251 | return rule->generate_filter_bytecode(rule, creds); |
| 252 | } |
| 253 | |
| 254 | LTTNG_HIDDEN |
| 255 | const char *lttng_event_rule_get_filter(const struct lttng_event_rule *rule) |
| 256 | { |
| 257 | assert(rule->get_filter); |
| 258 | return rule->get_filter(rule); |
| 259 | } |
| 260 | |
| 261 | LTTNG_HIDDEN |
| 262 | const struct lttng_bytecode *lttng_event_rule_get_filter_bytecode( |
| 263 | const struct lttng_event_rule *rule) |
| 264 | { |
| 265 | assert(rule->get_filter_bytecode); |
| 266 | return rule->get_filter_bytecode(rule); |
| 267 | } |
| 268 | |
| 269 | LTTNG_HIDDEN |
| 270 | enum lttng_event_rule_generate_exclusions_status |
| 271 | lttng_event_rule_generate_exclusions(const struct lttng_event_rule *rule, |
| 272 | struct lttng_event_exclusion **exclusions) |
| 273 | { |
| 274 | assert(rule->generate_exclusions); |
| 275 | return rule->generate_exclusions(rule, exclusions); |
| 276 | } |
| 277 | |
| 278 | LTTNG_HIDDEN |
| 279 | struct lttng_event *lttng_event_rule_generate_lttng_event( |
| 280 | const struct lttng_event_rule *rule) |
| 281 | { |
| 282 | assert(rule->generate_lttng_event); |
| 283 | return rule->generate_lttng_event(rule); |
| 284 | } |
| 285 | |
| 286 | LTTNG_HIDDEN |
| 287 | bool lttng_event_rule_targets_agent_domain(const struct lttng_event_rule *rule) |
| 288 | { |
| 289 | bool targets_agent_domain = false; |
| 290 | enum lttng_domain_type type = lttng_event_rule_get_domain_type(rule); |
| 291 | |
| 292 | switch (type) { |
| 293 | case LTTNG_DOMAIN_JUL: |
| 294 | case LTTNG_DOMAIN_LOG4J: |
| 295 | case LTTNG_DOMAIN_PYTHON: |
| 296 | targets_agent_domain = true; |
| 297 | break; |
| 298 | case LTTNG_DOMAIN_UST: |
| 299 | case LTTNG_DOMAIN_KERNEL: |
| 300 | targets_agent_domain = false; |
| 301 | break; |
| 302 | default: |
| 303 | abort(); |
| 304 | }; |
| 305 | |
| 306 | return targets_agent_domain; |
| 307 | } |
| 308 | |
| 309 | const char *lttng_event_rule_type_str(enum lttng_event_rule_type type) |
| 310 | { |
| 311 | switch (type) { |
| 312 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: |
| 313 | return "unknown"; |
| 314 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 315 | return "tracepoint"; |
| 316 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 317 | return "syscall"; |
| 318 | case LTTNG_EVENT_RULE_TYPE_KPROBE: |
| 319 | return "probe"; |
| 320 | case LTTNG_EVENT_RULE_TYPE_KRETPROBE: |
| 321 | return "function"; |
| 322 | case LTTNG_EVENT_RULE_TYPE_UPROBE: |
| 323 | return "userspace-probe"; |
| 324 | default: |
| 325 | abort(); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | LTTNG_HIDDEN |
| 330 | unsigned long lttng_event_rule_hash(const struct lttng_event_rule *rule) |
| 331 | { |
| 332 | assert(rule->hash); |
| 333 | return rule->hash(rule); |
| 334 | } |