| 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 <lttng/event-rule/event-rule-internal.h> |
| 15 | #include <lttng/event-rule/kprobe-internal.h> |
| 16 | #include <lttng/event-rule/syscall-internal.h> |
| 17 | #include <stdbool.h> |
| 18 | |
| 19 | enum lttng_event_rule_type lttng_event_rule_get_type( |
| 20 | const struct lttng_event_rule *event_rule) |
| 21 | { |
| 22 | return event_rule ? event_rule->type : LTTNG_EVENT_RULE_TYPE_UNKNOWN; |
| 23 | } |
| 24 | |
| 25 | LTTNG_HIDDEN |
| 26 | enum lttng_domain_type lttng_event_rule_get_domain_type( |
| 27 | const struct lttng_event_rule *event_rule) |
| 28 | { |
| 29 | enum lttng_domain_type domain_type = LTTNG_DOMAIN_NONE; |
| 30 | |
| 31 | switch (lttng_event_rule_get_type(event_rule)) { |
| 32 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 33 | /* TODO */ |
| 34 | domain_type = LTTNG_DOMAIN_NONE; |
| 35 | break; |
| 36 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 37 | case LTTNG_EVENT_RULE_TYPE_KPROBE: |
| 38 | case LTTNG_EVENT_RULE_TYPE_KRETPROBE: |
| 39 | case LTTNG_EVENT_RULE_TYPE_UPROBE: |
| 40 | domain_type = LTTNG_DOMAIN_KERNEL; |
| 41 | break; |
| 42 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: |
| 43 | domain_type = LTTNG_DOMAIN_NONE; |
| 44 | break; |
| 45 | } |
| 46 | |
| 47 | return domain_type; |
| 48 | } |
| 49 | |
| 50 | static void lttng_event_rule_release(struct urcu_ref *ref) |
| 51 | { |
| 52 | struct lttng_event_rule *event_rule = |
| 53 | container_of(ref, typeof(*event_rule), ref); |
| 54 | |
| 55 | assert(event_rule->destroy); |
| 56 | event_rule->destroy(event_rule); |
| 57 | } |
| 58 | |
| 59 | void lttng_event_rule_destroy(struct lttng_event_rule *event_rule) |
| 60 | { |
| 61 | lttng_event_rule_put(event_rule); |
| 62 | } |
| 63 | |
| 64 | LTTNG_HIDDEN |
| 65 | bool lttng_event_rule_validate(const struct lttng_event_rule *event_rule) |
| 66 | { |
| 67 | bool valid; |
| 68 | |
| 69 | if (!event_rule) { |
| 70 | valid = false; |
| 71 | goto end; |
| 72 | } |
| 73 | |
| 74 | if (!event_rule->validate) { |
| 75 | /* Sub-class guarantees that it can never be invalid. */ |
| 76 | valid = true; |
| 77 | goto end; |
| 78 | } |
| 79 | |
| 80 | valid = event_rule->validate(event_rule); |
| 81 | end: |
| 82 | return valid; |
| 83 | } |
| 84 | |
| 85 | LTTNG_HIDDEN |
| 86 | int lttng_event_rule_serialize(const struct lttng_event_rule *event_rule, |
| 87 | struct lttng_payload *payload) |
| 88 | { |
| 89 | int ret; |
| 90 | struct lttng_event_rule_comm event_rule_comm = {}; |
| 91 | |
| 92 | if (!event_rule) { |
| 93 | ret = -1; |
| 94 | goto end; |
| 95 | } |
| 96 | |
| 97 | event_rule_comm.event_rule_type = (int8_t) event_rule->type; |
| 98 | |
| 99 | ret = lttng_dynamic_buffer_append( |
| 100 | &payload->buffer, &event_rule_comm, sizeof(event_rule_comm)); |
| 101 | if (ret) { |
| 102 | goto end; |
| 103 | } |
| 104 | |
| 105 | ret = event_rule->serialize(event_rule, payload); |
| 106 | if (ret) { |
| 107 | goto end; |
| 108 | } |
| 109 | end: |
| 110 | return ret; |
| 111 | } |
| 112 | |
| 113 | LTTNG_HIDDEN |
| 114 | bool lttng_event_rule_is_equal(const struct lttng_event_rule *a, |
| 115 | const struct lttng_event_rule *b) |
| 116 | { |
| 117 | bool is_equal = false; |
| 118 | |
| 119 | if (!a || !b) { |
| 120 | goto end; |
| 121 | } |
| 122 | |
| 123 | if (a->type != b->type) { |
| 124 | goto end; |
| 125 | } |
| 126 | |
| 127 | if (a == b) { |
| 128 | is_equal = true; |
| 129 | goto end; |
| 130 | } |
| 131 | |
| 132 | is_equal = a->equal ? a->equal(a, b) : true; |
| 133 | end: |
| 134 | return is_equal; |
| 135 | } |
| 136 | |
| 137 | LTTNG_HIDDEN |
| 138 | ssize_t lttng_event_rule_create_from_payload( |
| 139 | struct lttng_payload_view *view, |
| 140 | struct lttng_event_rule **event_rule) |
| 141 | { |
| 142 | ssize_t ret, consumed = 0; |
| 143 | const struct lttng_event_rule_comm *event_rule_comm; |
| 144 | event_rule_create_from_payload_cb create_from_payload = NULL; |
| 145 | |
| 146 | if (!view || !event_rule) { |
| 147 | ret = -1; |
| 148 | goto end; |
| 149 | } |
| 150 | |
| 151 | DBG("Deserializing event_rule from payload."); |
| 152 | event_rule_comm = (const struct lttng_event_rule_comm *) view->buffer.data; |
| 153 | consumed += sizeof(*event_rule_comm); |
| 154 | |
| 155 | switch ((enum lttng_event_rule_type) event_rule_comm->event_rule_type) { |
| 156 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 157 | /* TODO */ |
| 158 | break; |
| 159 | case LTTNG_EVENT_RULE_TYPE_KPROBE: |
| 160 | create_from_payload = lttng_event_rule_kprobe_create_from_payload; |
| 161 | break; |
| 162 | case LTTNG_EVENT_RULE_TYPE_KRETPROBE: |
| 163 | /* TODO */ |
| 164 | break; |
| 165 | case LTTNG_EVENT_RULE_TYPE_UPROBE: |
| 166 | /* TODO */ |
| 167 | break; |
| 168 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 169 | create_from_payload = |
| 170 | lttng_event_rule_syscall_create_from_payload; |
| 171 | break; |
| 172 | default: |
| 173 | ERR("Attempted to create event rule of unknown type (%i)", |
| 174 | (int) event_rule_comm->event_rule_type); |
| 175 | ret = -1; |
| 176 | goto end; |
| 177 | } |
| 178 | |
| 179 | assert(create_from_payload); |
| 180 | |
| 181 | { |
| 182 | struct lttng_payload_view child_view = |
| 183 | lttng_payload_view_from_view( |
| 184 | view, consumed, -1); |
| 185 | |
| 186 | ret = create_from_payload(&child_view, event_rule); |
| 187 | if (ret < 0) { |
| 188 | goto end; |
| 189 | } |
| 190 | |
| 191 | consumed += ret; |
| 192 | } |
| 193 | |
| 194 | if (!lttng_event_rule_validate(*event_rule)) { |
| 195 | ret = -1; |
| 196 | goto end; |
| 197 | } |
| 198 | |
| 199 | ret = consumed; |
| 200 | end: |
| 201 | return ret; |
| 202 | } |
| 203 | |
| 204 | LTTNG_HIDDEN |
| 205 | void lttng_event_rule_init(struct lttng_event_rule *event_rule, |
| 206 | enum lttng_event_rule_type type) |
| 207 | { |
| 208 | urcu_ref_init(&event_rule->ref); |
| 209 | event_rule->type = type; |
| 210 | } |
| 211 | |
| 212 | LTTNG_HIDDEN |
| 213 | bool lttng_event_rule_get(struct lttng_event_rule *event_rule) |
| 214 | { |
| 215 | return urcu_ref_get_unless_zero(&event_rule->ref); |
| 216 | } |
| 217 | |
| 218 | LTTNG_HIDDEN |
| 219 | void lttng_event_rule_put(struct lttng_event_rule *event_rule) |
| 220 | { |
| 221 | if (!event_rule) { |
| 222 | return; |
| 223 | } |
| 224 | |
| 225 | assert(event_rule->ref.refcount); |
| 226 | urcu_ref_put(&event_rule->ref, lttng_event_rule_release); |
| 227 | } |
| 228 | |
| 229 | LTTNG_HIDDEN |
| 230 | enum lttng_error_code lttng_event_rule_generate_filter_bytecode( |
| 231 | struct lttng_event_rule *rule, uid_t uid, gid_t gid) |
| 232 | { |
| 233 | assert(rule->generate_filter_bytecode); |
| 234 | return rule->generate_filter_bytecode(rule, uid, gid); |
| 235 | } |
| 236 | |
| 237 | LTTNG_HIDDEN |
| 238 | const char *lttng_event_rule_get_filter(const struct lttng_event_rule *rule) |
| 239 | { |
| 240 | assert(rule->get_filter); |
| 241 | return rule->get_filter(rule); |
| 242 | } |
| 243 | |
| 244 | LTTNG_HIDDEN |
| 245 | const struct lttng_filter_bytecode *lttng_event_rule_get_filter_bytecode( |
| 246 | const struct lttng_event_rule *rule) |
| 247 | { |
| 248 | assert(rule->get_filter_bytecode); |
| 249 | return rule->get_filter_bytecode(rule); |
| 250 | } |
| 251 | |
| 252 | LTTNG_HIDDEN |
| 253 | struct lttng_event_exclusion *lttng_event_rule_generate_exclusions( |
| 254 | const struct lttng_event_rule *rule) |
| 255 | { |
| 256 | assert(rule->generate_exclusions); |
| 257 | return rule->generate_exclusions(rule); |
| 258 | } |
| 259 | |
| 260 | LTTNG_HIDDEN |
| 261 | const char *lttng_event_rule_type_str(enum lttng_event_rule_type type) |
| 262 | { |
| 263 | switch (type) { |
| 264 | case LTTNG_EVENT_RULE_TYPE_UNKNOWN: |
| 265 | return "unknown"; |
| 266 | case LTTNG_EVENT_RULE_TYPE_TRACEPOINT: |
| 267 | return "tracepoint"; |
| 268 | case LTTNG_EVENT_RULE_TYPE_SYSCALL: |
| 269 | return "syscall"; |
| 270 | case LTTNG_EVENT_RULE_TYPE_KPROBE: |
| 271 | return "probe"; |
| 272 | case LTTNG_EVENT_RULE_TYPE_KRETPROBE: |
| 273 | return "function"; |
| 274 | case LTTNG_EVENT_RULE_TYPE_UPROBE: |
| 275 | return "userspace-probe"; |
| 276 | default: |
| 277 | abort(); |
| 278 | } |
| 279 | } |