| 1 | /* |
| 2 | * Copyright (C) 2020 Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * SPDX-License-Identifier: LGPL-2.1-only |
| 5 | * |
| 6 | */ |
| 7 | |
| 8 | #include "lttng-ctl-helper.h" |
| 9 | #include "lttng/domain.h" |
| 10 | #include "lttng/lttng-error.h" |
| 11 | #include <common/sessiond-comm/sessiond-comm.h> |
| 12 | #include <common/tracker.h> |
| 13 | #include <lttng/tracker.h> |
| 14 | |
| 15 | struct lttng_process_attr_tracker_handle { |
| 16 | char *session_name; |
| 17 | enum lttng_domain_type domain; |
| 18 | enum lttng_process_attr process_attr; |
| 19 | struct lttng_process_attr_values *inclusion_set; |
| 20 | }; |
| 21 | |
| 22 | void lttng_process_attr_tracker_handle_destroy( |
| 23 | struct lttng_process_attr_tracker_handle *tracker) |
| 24 | { |
| 25 | if (!tracker) { |
| 26 | return; |
| 27 | } |
| 28 | |
| 29 | lttng_process_attr_values_destroy(tracker->inclusion_set); |
| 30 | free(tracker->session_name); |
| 31 | free(tracker); |
| 32 | } |
| 33 | |
| 34 | enum lttng_error_code lttng_session_get_tracker_handle(const char *session_name, |
| 35 | enum lttng_domain_type domain, |
| 36 | enum lttng_process_attr process_attr, |
| 37 | struct lttng_process_attr_tracker_handle **out_tracker_handle) |
| 38 | { |
| 39 | enum lttng_error_code ret_code = LTTNG_OK; |
| 40 | struct lttng_process_attr_tracker_handle *handle = NULL; |
| 41 | enum lttng_process_attr_tracker_handle_status status; |
| 42 | enum lttng_tracking_policy policy; |
| 43 | |
| 44 | if (!session_name || !out_tracker_handle) { |
| 45 | ret_code = LTTNG_ERR_INVALID; |
| 46 | goto error; |
| 47 | } |
| 48 | |
| 49 | if (domain != LTTNG_DOMAIN_KERNEL && domain != LTTNG_DOMAIN_UST) { |
| 50 | ret_code = LTTNG_ERR_UNSUPPORTED_DOMAIN; |
| 51 | goto error; |
| 52 | } |
| 53 | |
| 54 | handle = (lttng_process_attr_tracker_handle *) zmalloc(sizeof(*handle)); |
| 55 | if (!handle) { |
| 56 | ret_code = LTTNG_ERR_NOMEM; |
| 57 | goto error; |
| 58 | } |
| 59 | |
| 60 | handle->session_name = strdup(session_name); |
| 61 | if (!handle->session_name) { |
| 62 | ret_code = LTTNG_ERR_NOMEM; |
| 63 | goto error; |
| 64 | } |
| 65 | |
| 66 | handle->domain = domain; |
| 67 | handle->process_attr = process_attr; |
| 68 | |
| 69 | /* |
| 70 | * Use the `get_tracking_policy` command to validate the tracker's |
| 71 | * existence. |
| 72 | */ |
| 73 | status = lttng_process_attr_tracker_handle_get_tracking_policy( |
| 74 | handle, &policy); |
| 75 | switch (status) { |
| 76 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK: |
| 77 | break; |
| 78 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_SESSION_DOES_NOT_EXIST: |
| 79 | ret_code = LTTNG_ERR_SESSION_NOT_EXIST; |
| 80 | goto error; |
| 81 | default: |
| 82 | ret_code = LTTNG_ERR_UNK; |
| 83 | goto error; |
| 84 | } |
| 85 | |
| 86 | *out_tracker_handle = handle; |
| 87 | return ret_code; |
| 88 | error: |
| 89 | lttng_process_attr_tracker_handle_destroy(handle); |
| 90 | return ret_code; |
| 91 | } |
| 92 | |
| 93 | enum lttng_process_attr_tracker_handle_status |
| 94 | lttng_process_attr_tracker_handle_get_tracking_policy( |
| 95 | const struct lttng_process_attr_tracker_handle *tracker, |
| 96 | enum lttng_tracking_policy *policy) |
| 97 | { |
| 98 | void *reply = NULL; |
| 99 | int reply_ret, copy_ret; |
| 100 | enum lttng_process_attr_tracker_handle_status status = |
| 101 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK; |
| 102 | struct lttcomm_session_msg lsm = { |
| 103 | .cmd_type = LTTNG_PROCESS_ATTR_TRACKER_GET_POLICY, |
| 104 | }; |
| 105 | |
| 106 | if (!tracker || !policy) { |
| 107 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; |
| 108 | goto end; |
| 109 | } |
| 110 | |
| 111 | copy_ret = lttng_strncpy(lsm.session.name, tracker->session_name, |
| 112 | sizeof(lsm.session.name)); |
| 113 | if (copy_ret) { |
| 114 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; |
| 115 | goto end; |
| 116 | } |
| 117 | |
| 118 | lsm.domain.type = tracker->domain; |
| 119 | lsm.u.process_attr_tracker_get_tracking_policy.process_attr = |
| 120 | (int32_t) tracker->process_attr; |
| 121 | |
| 122 | /* Command returns a session descriptor on success. */ |
| 123 | reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header( |
| 124 | &lsm, NULL, 0, &reply); |
| 125 | if (reply_ret != sizeof(uint32_t)) { |
| 126 | if (reply_ret == -LTTNG_ERR_SESSION_NOT_EXIST || |
| 127 | reply_ret == -LTTNG_ERR_SESS_NOT_FOUND) { |
| 128 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_SESSION_DOES_NOT_EXIST; |
| 129 | } else { |
| 130 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR; |
| 131 | } |
| 132 | goto end; |
| 133 | } |
| 134 | |
| 135 | *policy = (enum lttng_tracking_policy)(*((const uint32_t *) reply)); |
| 136 | end: |
| 137 | free(reply); |
| 138 | return status; |
| 139 | } |
| 140 | |
| 141 | enum lttng_process_attr_tracker_handle_status |
| 142 | lttng_process_attr_tracker_handle_set_tracking_policy( |
| 143 | const struct lttng_process_attr_tracker_handle *tracker, |
| 144 | enum lttng_tracking_policy policy) |
| 145 | { |
| 146 | int reply_ret, copy_ret; |
| 147 | enum lttng_process_attr_tracker_handle_status status = |
| 148 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK; |
| 149 | struct lttcomm_session_msg lsm = { |
| 150 | .cmd_type = LTTNG_PROCESS_ATTR_TRACKER_SET_POLICY, |
| 151 | }; |
| 152 | |
| 153 | if (!tracker) { |
| 154 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; |
| 155 | goto end; |
| 156 | } |
| 157 | |
| 158 | copy_ret = lttng_strncpy(lsm.session.name, tracker->session_name, |
| 159 | sizeof(lsm.session.name)); |
| 160 | if (copy_ret) { |
| 161 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; |
| 162 | goto end; |
| 163 | } |
| 164 | |
| 165 | lsm.domain.type = tracker->domain; |
| 166 | lsm.u.process_attr_tracker_set_tracking_policy.process_attr = |
| 167 | (int32_t) tracker->process_attr; |
| 168 | lsm.u.process_attr_tracker_set_tracking_policy.tracking_policy = |
| 169 | (int32_t) policy; |
| 170 | |
| 171 | /* Command returns a session descriptor on success. */ |
| 172 | reply_ret = lttng_ctl_ask_sessiond(&lsm, NULL); |
| 173 | if (reply_ret < 0) { |
| 174 | if (reply_ret == -LTTNG_ERR_SESSION_NOT_EXIST) { |
| 175 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_SESSION_DOES_NOT_EXIST; |
| 176 | } else { |
| 177 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR; |
| 178 | } |
| 179 | goto end; |
| 180 | } |
| 181 | end: |
| 182 | return status; |
| 183 | } |
| 184 | |
| 185 | #define DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC(command_upper, \ |
| 186 | command_lower, process_attr_name, value_type_name, \ |
| 187 | value_type_c, value_type_enum) \ |
| 188 | enum lttng_process_attr_tracker_handle_status \ |
| 189 | lttng_process_attr_##process_attr_name##_tracker_handle_##command_lower##_##value_type_name( \ |
| 190 | const struct lttng_process_attr_tracker_handle \ |
| 191 | *tracker, \ |
| 192 | value_type_c value) \ |
| 193 | { \ |
| 194 | int ret; \ |
| 195 | enum lttng_process_attr_tracker_handle_status status = \ |
| 196 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK; \ |
| 197 | struct lttcomm_session_msg lsm = { \ |
| 198 | .cmd_type = LTTNG_PROCESS_ATTR_TRACKER_##command_upper##_INCLUDE_VALUE}; \ |
| 199 | \ |
| 200 | if (!tracker) { \ |
| 201 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; \ |
| 202 | goto end; \ |
| 203 | } \ |
| 204 | \ |
| 205 | ret = lttng_strncpy(lsm.session.name, tracker->session_name, \ |
| 206 | sizeof(lsm.session.name)); \ |
| 207 | if (ret) { \ |
| 208 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; \ |
| 209 | goto end; \ |
| 210 | } \ |
| 211 | \ |
| 212 | lsm.domain.type = tracker->domain; \ |
| 213 | lsm.u.process_attr_tracker_add_remove_include_value \ |
| 214 | .process_attr = \ |
| 215 | (int32_t) tracker->process_attr; \ |
| 216 | lsm.u.process_attr_tracker_add_remove_include_value \ |
| 217 | .value_type = (uint32_t) \ |
| 218 | LTTNG_PROCESS_ATTR_VALUE_TYPE_##value_type_enum; \ |
| 219 | \ |
| 220 | if (is_signed(value_type_c)) { \ |
| 221 | lsm.u.process_attr_tracker_add_remove_include_value \ |
| 222 | .integral_value.u._signed = value; \ |
| 223 | } else { \ |
| 224 | lsm.u.process_attr_tracker_add_remove_include_value \ |
| 225 | .integral_value.u._unsigned = value; \ |
| 226 | } \ |
| 227 | \ |
| 228 | ret = lttng_ctl_ask_sessiond(&lsm, NULL); \ |
| 229 | if (ret < 0) { \ |
| 230 | switch (-ret) { \ |
| 231 | case LTTNG_ERR_PROCESS_ATTR_EXISTS: \ |
| 232 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS; \ |
| 233 | break; \ |
| 234 | case LTTNG_ERR_PROCESS_ATTR_MISSING: \ |
| 235 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING; \ |
| 236 | break; \ |
| 237 | case LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY: \ |
| 238 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID_TRACKING_POLICY; \ |
| 239 | break; \ |
| 240 | default: \ |
| 241 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR; \ |
| 242 | } \ |
| 243 | } \ |
| 244 | end: \ |
| 245 | return status; \ |
| 246 | } |
| 247 | |
| 248 | #define DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC(command_upper, \ |
| 249 | command_lower, process_attr_name, value_type_name, \ |
| 250 | value_type_enum) \ |
| 251 | enum lttng_process_attr_tracker_handle_status \ |
| 252 | lttng_process_attr_##process_attr_name##_tracker_handle_##command_lower##_##value_type_name( \ |
| 253 | const struct lttng_process_attr_tracker_handle \ |
| 254 | *tracker, \ |
| 255 | const char *value) \ |
| 256 | { \ |
| 257 | int ret; \ |
| 258 | enum lttng_process_attr_tracker_handle_status status = \ |
| 259 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK; \ |
| 260 | struct lttcomm_session_msg lsm = { \ |
| 261 | .cmd_type = LTTNG_PROCESS_ATTR_TRACKER_##command_upper##_INCLUDE_VALUE}; \ |
| 262 | const size_t len = value ? strlen(value) + 1 : 0; \ |
| 263 | \ |
| 264 | if (!tracker || !value) { \ |
| 265 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; \ |
| 266 | goto end; \ |
| 267 | } \ |
| 268 | \ |
| 269 | ret = lttng_strncpy(lsm.session.name, tracker->session_name, \ |
| 270 | sizeof(lsm.session.name)); \ |
| 271 | if (ret) { \ |
| 272 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; \ |
| 273 | goto end; \ |
| 274 | } \ |
| 275 | \ |
| 276 | lsm.domain.type = tracker->domain; \ |
| 277 | lsm.u.process_attr_tracker_add_remove_include_value \ |
| 278 | .process_attr = \ |
| 279 | (int32_t) tracker->process_attr; \ |
| 280 | lsm.u.process_attr_tracker_add_remove_include_value.name_len = \ |
| 281 | (uint32_t) len; \ |
| 282 | lsm.u.process_attr_tracker_add_remove_include_value \ |
| 283 | .value_type = (uint32_t) \ |
| 284 | LTTNG_PROCESS_ATTR_VALUE_TYPE_##value_type_enum; \ |
| 285 | \ |
| 286 | ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header( \ |
| 287 | &lsm, value, len, NULL); \ |
| 288 | if (ret < 0) { \ |
| 289 | switch (-ret) { \ |
| 290 | case LTTNG_ERR_PROCESS_ATTR_EXISTS: \ |
| 291 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS; \ |
| 292 | break; \ |
| 293 | case LTTNG_ERR_PROCESS_ATTR_MISSING: \ |
| 294 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING; \ |
| 295 | break; \ |
| 296 | case LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY: \ |
| 297 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID_TRACKING_POLICY; \ |
| 298 | break; \ |
| 299 | case LTTNG_ERR_USER_NOT_FOUND: \ |
| 300 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_USER_NOT_FOUND; \ |
| 301 | break; \ |
| 302 | case LTTNG_ERR_GROUP_NOT_FOUND: \ |
| 303 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_GROUP_NOT_FOUND; \ |
| 304 | break; \ |
| 305 | default: \ |
| 306 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR; \ |
| 307 | } \ |
| 308 | } \ |
| 309 | end: \ |
| 310 | return status; \ |
| 311 | } |
| 312 | |
| 313 | /* PID */ |
| 314 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 315 | ADD, add, process_id, pid, pid_t, PID); |
| 316 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 317 | REMOVE, remove, process_id, pid, pid_t, PID); |
| 318 | |
| 319 | /* VPID */ |
| 320 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 321 | ADD, add, virtual_process_id, pid, pid_t, PID); |
| 322 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 323 | REMOVE, remove, virtual_process_id, pid, pid_t, PID); |
| 324 | |
| 325 | /* UID */ |
| 326 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 327 | ADD, add, user_id, uid, uid_t, UID); |
| 328 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 329 | REMOVE, remove, user_id, uid, uid_t, UID); |
| 330 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 331 | ADD, add, user_id, user_name, USER_NAME); |
| 332 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 333 | REMOVE, remove, user_id, user_name, USER_NAME); |
| 334 | |
| 335 | /* VUID */ |
| 336 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 337 | ADD, add, virtual_user_id, uid, uid_t, UID); |
| 338 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 339 | REMOVE, remove, virtual_user_id, uid, uid_t, UID); |
| 340 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 341 | ADD, add, virtual_user_id, user_name, USER_NAME); |
| 342 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 343 | REMOVE, remove, virtual_user_id, user_name, USER_NAME); |
| 344 | |
| 345 | /* GID */ |
| 346 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 347 | ADD, add, group_id, gid, gid_t, GID); |
| 348 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 349 | REMOVE, remove, group_id, gid, gid_t, GID); |
| 350 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 351 | ADD, add, group_id, group_name, GROUP_NAME); |
| 352 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 353 | REMOVE, remove, group_id, group_name, GROUP_NAME); |
| 354 | |
| 355 | /* VGID */ |
| 356 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 357 | ADD, add, virtual_group_id, gid, gid_t, GID); |
| 358 | DEFINE_TRACKER_ADD_REMOVE_INTEGRAL_VALUE_FUNC( |
| 359 | REMOVE, remove, virtual_group_id, gid, gid_t, GID); |
| 360 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 361 | ADD, add, virtual_group_id, group_name, GROUP_NAME); |
| 362 | DEFINE_TRACKER_ADD_REMOVE_STRING_VALUE_FUNC( |
| 363 | REMOVE, remove, virtual_group_id, group_name, GROUP_NAME); |
| 364 | |
| 365 | enum lttng_process_attr_tracker_handle_status |
| 366 | lttng_process_attr_tracker_handle_get_inclusion_set( |
| 367 | struct lttng_process_attr_tracker_handle *tracker, |
| 368 | const struct lttng_process_attr_values **values) |
| 369 | { |
| 370 | char *reply = NULL; |
| 371 | int reply_ret, copy_ret; |
| 372 | enum lttng_process_attr_tracker_handle_status status = |
| 373 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK; |
| 374 | struct lttcomm_session_msg lsm = { |
| 375 | .cmd_type = LTTNG_PROCESS_ATTR_TRACKER_GET_INCLUSION_SET, |
| 376 | }; |
| 377 | struct lttng_buffer_view inclusion_set_view; |
| 378 | ssize_t inclusion_set_ret; |
| 379 | |
| 380 | if (!tracker || !values) { |
| 381 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; |
| 382 | goto end; |
| 383 | } |
| 384 | |
| 385 | lttng_process_attr_values_destroy(tracker->inclusion_set); |
| 386 | tracker->inclusion_set = NULL; |
| 387 | |
| 388 | copy_ret = lttng_strncpy(lsm.session.name, tracker->session_name, |
| 389 | sizeof(lsm.session.name)); |
| 390 | if (copy_ret) { |
| 391 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID; |
| 392 | goto end; |
| 393 | } |
| 394 | |
| 395 | lsm.domain.type = tracker->domain; |
| 396 | lsm.u.process_attr_tracker_get_tracking_policy.process_attr = |
| 397 | (int32_t) tracker->process_attr; |
| 398 | |
| 399 | /* Command returns a session descriptor on success. */ |
| 400 | reply_ret = lttng_ctl_ask_sessiond_varlen_no_cmd_header( |
| 401 | &lsm, NULL, 0, (void **) &reply); |
| 402 | if (reply_ret < 0) { |
| 403 | if (reply_ret == -LTTNG_ERR_SESSION_NOT_EXIST) { |
| 404 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_SESSION_DOES_NOT_EXIST; |
| 405 | } else if (reply_ret == |
| 406 | -LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY) { |
| 407 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID_TRACKING_POLICY; |
| 408 | } else { |
| 409 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR; |
| 410 | } |
| 411 | goto end; |
| 412 | } else if (reply_ret == 0) { |
| 413 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR; |
| 414 | goto end; |
| 415 | } |
| 416 | |
| 417 | inclusion_set_view = lttng_buffer_view_init(reply, 0, reply_ret); |
| 418 | if (!inclusion_set_view.data) { |
| 419 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR; |
| 420 | goto end; |
| 421 | } |
| 422 | |
| 423 | inclusion_set_ret = lttng_process_attr_values_create_from_buffer( |
| 424 | tracker->domain, tracker->process_attr, |
| 425 | &inclusion_set_view, &tracker->inclusion_set); |
| 426 | if (inclusion_set_ret < 0) { |
| 427 | status = LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR; |
| 428 | goto end; |
| 429 | } |
| 430 | *values = tracker->inclusion_set; |
| 431 | end: |
| 432 | free(reply); |
| 433 | return status; |
| 434 | } |
| 435 | |
| 436 | enum lttng_process_attr_values_status lttng_process_attr_values_get_count( |
| 437 | const struct lttng_process_attr_values *values, |
| 438 | unsigned int *count) |
| 439 | { |
| 440 | enum lttng_process_attr_values_status status = |
| 441 | LTTNG_PROCESS_ATTR_VALUES_STATUS_OK; |
| 442 | |
| 443 | if (!values || !count) { |
| 444 | status = LTTNG_PROCESS_ATTR_VALUES_STATUS_INVALID; |
| 445 | goto end; |
| 446 | } |
| 447 | |
| 448 | *count = _lttng_process_attr_values_get_count(values); |
| 449 | end: |
| 450 | return status; |
| 451 | } |
| 452 | |
| 453 | enum lttng_process_attr_value_type lttng_process_attr_values_get_type_at_index( |
| 454 | const struct lttng_process_attr_values *values, |
| 455 | unsigned int index) |
| 456 | { |
| 457 | enum lttng_process_attr_value_type type; |
| 458 | const struct process_attr_value *value; |
| 459 | |
| 460 | if (!values) { |
| 461 | type = LTTNG_PROCESS_ATTR_VALUE_TYPE_INVALID; |
| 462 | goto end; |
| 463 | } |
| 464 | |
| 465 | if (_lttng_process_attr_values_get_count(values) <= index) { |
| 466 | type = LTTNG_PROCESS_ATTR_VALUE_TYPE_INVALID; |
| 467 | goto end; |
| 468 | } |
| 469 | |
| 470 | value = lttng_process_attr_tracker_values_get_at_index(values, index); |
| 471 | type = value->type; |
| 472 | end: |
| 473 | return type; |
| 474 | } |
| 475 | |
| 476 | #define DEFINE_LTTNG_PROCESS_ATTR_VALUES_GETTER( \ |
| 477 | value_type_name, value_type, expected_value_type) \ |
| 478 | enum lttng_process_attr_values_status \ |
| 479 | lttng_process_attr_values_get_##value_type_name##_at_index( \ |
| 480 | const struct lttng_process_attr_values \ |
| 481 | *values, \ |
| 482 | unsigned int index, \ |
| 483 | value_type *out_value) \ |
| 484 | { \ |
| 485 | enum lttng_process_attr_values_status status = \ |
| 486 | LTTNG_PROCESS_ATTR_VALUES_STATUS_OK; \ |
| 487 | const struct process_attr_value *value; \ |
| 488 | \ |
| 489 | if (!values) { \ |
| 490 | status = LTTNG_PROCESS_ATTR_VALUES_STATUS_INVALID; \ |
| 491 | goto end; \ |
| 492 | } \ |
| 493 | \ |
| 494 | if (_lttng_process_attr_values_get_count(values) <= index) { \ |
| 495 | status = LTTNG_PROCESS_ATTR_VALUES_STATUS_INVALID; \ |
| 496 | goto end; \ |
| 497 | } \ |
| 498 | \ |
| 499 | value = lttng_process_attr_tracker_values_get_at_index( \ |
| 500 | values, index); \ |
| 501 | if (value->type != \ |
| 502 | LTTNG_PROCESS_ATTR_VALUE_TYPE_##expected_value_type) { \ |
| 503 | status = LTTNG_PROCESS_ATTR_VALUES_STATUS_INVALID_TYPE; \ |
| 504 | goto end; \ |
| 505 | } \ |
| 506 | *out_value = value->value.value_type_name; \ |
| 507 | end: \ |
| 508 | return status; \ |
| 509 | } |
| 510 | |
| 511 | DEFINE_LTTNG_PROCESS_ATTR_VALUES_GETTER(pid, pid_t, PID); |
| 512 | DEFINE_LTTNG_PROCESS_ATTR_VALUES_GETTER(uid, uid_t, UID); |
| 513 | DEFINE_LTTNG_PROCESS_ATTR_VALUES_GETTER(gid, gid_t, GID); |
| 514 | DEFINE_LTTNG_PROCESS_ATTR_VALUES_GETTER(user_name, const char *, USER_NAME); |
| 515 | DEFINE_LTTNG_PROCESS_ATTR_VALUES_GETTER(group_name, const char *, GROUP_NAME); |
| 516 | |
| 517 | static enum lttng_error_code handle_status_to_error_code( |
| 518 | enum lttng_process_attr_tracker_handle_status handle_status) |
| 519 | { |
| 520 | switch (handle_status) { |
| 521 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID_TRACKING_POLICY: |
| 522 | return LTTNG_ERR_INVALID; |
| 523 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_SESSION_DOES_NOT_EXIST: |
| 524 | return LTTNG_ERR_SESSION_NOT_EXIST; |
| 525 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_COMMUNICATION_ERROR: |
| 526 | return LTTNG_ERR_INVALID_PROTOCOL; |
| 527 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_EXISTS: |
| 528 | return LTTNG_ERR_PID_TRACKED; |
| 529 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_MISSING: |
| 530 | return LTTNG_ERR_PID_NOT_TRACKED; |
| 531 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK: |
| 532 | return LTTNG_OK; |
| 533 | case LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_ERROR: |
| 534 | default: |
| 535 | /* fall-through. */ |
| 536 | return LTTNG_ERR_UNK; |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | /* |
| 541 | * Add PID to session tracker. |
| 542 | * Return 0 on success else a negative LTTng error code. |
| 543 | */ |
| 544 | int lttng_track_pid(struct lttng_handle *handle, int pid) |
| 545 | { |
| 546 | enum lttng_error_code ret_code; |
| 547 | struct lttng_process_attr_tracker_handle *tracker_handle = NULL; |
| 548 | enum lttng_process_attr_tracker_handle_status handle_status; |
| 549 | enum lttng_tracking_policy policy; |
| 550 | enum lttng_process_attr process_attr; |
| 551 | |
| 552 | if (!handle) { |
| 553 | ret_code = LTTNG_ERR_INVALID; |
| 554 | goto end; |
| 555 | } |
| 556 | |
| 557 | process_attr = handle->domain.type == LTTNG_DOMAIN_KERNEL ? |
| 558 | LTTNG_PROCESS_ATTR_PROCESS_ID : |
| 559 | LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID; |
| 560 | |
| 561 | ret_code = lttng_session_get_tracker_handle(handle->session_name, |
| 562 | handle->domain.type, |
| 563 | process_attr, &tracker_handle); |
| 564 | if (ret_code != LTTNG_OK) { |
| 565 | goto end; |
| 566 | } |
| 567 | |
| 568 | if (pid == -1) { |
| 569 | handle_status = lttng_process_attr_tracker_handle_set_tracking_policy( |
| 570 | tracker_handle, |
| 571 | LTTNG_TRACKING_POLICY_INCLUDE_ALL); |
| 572 | ret_code = handle_status_to_error_code(handle_status); |
| 573 | goto end; |
| 574 | } |
| 575 | |
| 576 | handle_status = lttng_process_attr_tracker_handle_get_tracking_policy( |
| 577 | tracker_handle, &policy); |
| 578 | if (handle_status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { |
| 579 | ret_code = handle_status_to_error_code(handle_status); |
| 580 | goto end; |
| 581 | } |
| 582 | |
| 583 | if (policy != LTTNG_TRACKING_POLICY_INCLUDE_SET) { |
| 584 | handle_status = lttng_process_attr_tracker_handle_set_tracking_policy( |
| 585 | tracker_handle, |
| 586 | LTTNG_TRACKING_POLICY_INCLUDE_SET); |
| 587 | if (handle_status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { |
| 588 | ret_code = handle_status_to_error_code(handle_status); |
| 589 | goto end; |
| 590 | } |
| 591 | } |
| 592 | |
| 593 | handle_status = process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID ? |
| 594 | lttng_process_attr_process_id_tracker_handle_add_pid( |
| 595 | tracker_handle, |
| 596 | (pid_t) pid) : |
| 597 | lttng_process_attr_virtual_process_id_tracker_handle_add_pid( |
| 598 | tracker_handle, |
| 599 | (pid_t) pid); |
| 600 | ret_code = handle_status_to_error_code(handle_status); |
| 601 | end: |
| 602 | lttng_process_attr_tracker_handle_destroy(tracker_handle); |
| 603 | return ret_code == LTTNG_OK ? 0 : -ret_code; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * Remove PID from session tracker. |
| 608 | * Return 0 on success else a negative LTTng error code. |
| 609 | */ |
| 610 | int lttng_untrack_pid(struct lttng_handle *handle, int pid) |
| 611 | { |
| 612 | enum lttng_error_code ret_code; |
| 613 | struct lttng_process_attr_tracker_handle *tracker_handle = NULL; |
| 614 | enum lttng_process_attr_tracker_handle_status handle_status; |
| 615 | enum lttng_tracking_policy policy; |
| 616 | enum lttng_process_attr process_attr; |
| 617 | |
| 618 | if (!handle) { |
| 619 | ret_code = LTTNG_ERR_INVALID; |
| 620 | goto end; |
| 621 | } |
| 622 | |
| 623 | process_attr = handle->domain.type == LTTNG_DOMAIN_KERNEL ? |
| 624 | LTTNG_PROCESS_ATTR_PROCESS_ID : |
| 625 | LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID; |
| 626 | ret_code = lttng_session_get_tracker_handle(handle->session_name, |
| 627 | handle->domain.type, process_attr, &tracker_handle); |
| 628 | if (ret_code != LTTNG_OK) { |
| 629 | goto end; |
| 630 | } |
| 631 | |
| 632 | if (pid == -1) { |
| 633 | handle_status = lttng_process_attr_tracker_handle_set_tracking_policy( |
| 634 | tracker_handle, |
| 635 | LTTNG_TRACKING_POLICY_EXCLUDE_ALL); |
| 636 | ret_code = handle_status_to_error_code(handle_status); |
| 637 | goto end; |
| 638 | } |
| 639 | |
| 640 | handle_status = lttng_process_attr_tracker_handle_get_tracking_policy( |
| 641 | tracker_handle, &policy); |
| 642 | if (handle_status != LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { |
| 643 | ret_code = handle_status_to_error_code(handle_status); |
| 644 | goto end; |
| 645 | } |
| 646 | |
| 647 | if (policy == LTTNG_TRACKING_POLICY_EXCLUDE_ALL) { |
| 648 | ret_code = LTTNG_ERR_PID_NOT_TRACKED; |
| 649 | goto end; |
| 650 | } else if (policy == LTTNG_TRACKING_POLICY_INCLUDE_ALL) { |
| 651 | ret_code = LTTNG_ERR_INVALID; |
| 652 | goto end; |
| 653 | } |
| 654 | |
| 655 | handle_status = process_attr == LTTNG_PROCESS_ATTR_PROCESS_ID ? |
| 656 | lttng_process_attr_process_id_tracker_handle_remove_pid( |
| 657 | tracker_handle, |
| 658 | (pid_t) pid) : |
| 659 | lttng_process_attr_virtual_process_id_tracker_handle_remove_pid( |
| 660 | tracker_handle, |
| 661 | (pid_t) pid); |
| 662 | if (handle_status == LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID_TRACKING_POLICY) { |
| 663 | ret_code = LTTNG_ERR_PID_NOT_TRACKED; |
| 664 | } |
| 665 | end: |
| 666 | lttng_process_attr_tracker_handle_destroy(tracker_handle); |
| 667 | return ret_code == LTTNG_OK ? 0 : -ret_code; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * List PIDs in the tracker. |
| 672 | * |
| 673 | * enabled is set to whether the PID tracker is enabled. |
| 674 | * pids is set to an allocated array of PIDs currently tracked. On |
| 675 | * success, pids must be freed by the caller. |
| 676 | * nr_pids is set to the number of entries contained by the pids array. |
| 677 | * |
| 678 | * Returns 0 on success, else a negative LTTng error code. |
| 679 | */ |
| 680 | int lttng_list_tracker_pids(struct lttng_handle *handle, |
| 681 | int *_enabled, |
| 682 | int32_t **_pids, |
| 683 | size_t *_nr_pids) |
| 684 | { |
| 685 | enum lttng_error_code ret_code; |
| 686 | struct lttng_process_attr_tracker_handle *tracker_handle = NULL; |
| 687 | enum lttng_process_attr_tracker_handle_status handle_status; |
| 688 | const struct lttng_process_attr_values *values; |
| 689 | enum lttng_tracking_policy policy; |
| 690 | unsigned int pid_count, i; |
| 691 | int32_t *pid_array = NULL; |
| 692 | |
| 693 | if (!handle || !_enabled || !_pids || !_nr_pids) { |
| 694 | ret_code = LTTNG_ERR_INVALID; |
| 695 | goto end; |
| 696 | } |
| 697 | |
| 698 | ret_code = lttng_session_get_tracker_handle(handle->session_name, |
| 699 | handle->domain.type, |
| 700 | LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, &tracker_handle); |
| 701 | if (ret_code != LTTNG_OK) { |
| 702 | goto end; |
| 703 | } |
| 704 | |
| 705 | while (true) { |
| 706 | handle_status = lttng_process_attr_tracker_handle_get_inclusion_set( |
| 707 | tracker_handle, &values); |
| 708 | if (handle_status == |
| 709 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { |
| 710 | policy = LTTNG_TRACKING_POLICY_INCLUDE_SET; |
| 711 | break; |
| 712 | } else if (handle_status != |
| 713 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_INVALID_TRACKING_POLICY) { |
| 714 | ret_code = handle_status_to_error_code(handle_status); |
| 715 | goto end; |
| 716 | } |
| 717 | |
| 718 | handle_status = lttng_process_attr_tracker_handle_get_tracking_policy( |
| 719 | tracker_handle, &policy); |
| 720 | if (handle_status != |
| 721 | LTTNG_PROCESS_ATTR_TRACKER_HANDLE_STATUS_OK) { |
| 722 | ret_code = handle_status_to_error_code(handle_status); |
| 723 | goto end; |
| 724 | } |
| 725 | |
| 726 | /* Tracking policy changed in the meantime, retry. */ |
| 727 | if (policy == LTTNG_TRACKING_POLICY_INCLUDE_SET) { |
| 728 | continue; |
| 729 | } |
| 730 | break; |
| 731 | } |
| 732 | |
| 733 | switch (policy) { |
| 734 | case LTTNG_TRACKING_POLICY_INCLUDE_ALL: |
| 735 | *_enabled = 0; |
| 736 | goto end; |
| 737 | case LTTNG_TRACKING_POLICY_EXCLUDE_ALL: |
| 738 | *_enabled = 1; |
| 739 | pid_count = 0; |
| 740 | break; |
| 741 | case LTTNG_TRACKING_POLICY_INCLUDE_SET: |
| 742 | { |
| 743 | const enum lttng_process_attr_values_status values_status = |
| 744 | lttng_process_attr_values_get_count( |
| 745 | values, &pid_count); |
| 746 | |
| 747 | if (values_status != LTTNG_PROCESS_ATTR_VALUES_STATUS_OK) { |
| 748 | ret_code = LTTNG_ERR_UNK; |
| 749 | goto end; |
| 750 | } |
| 751 | break; |
| 752 | } |
| 753 | default: |
| 754 | ret_code = LTTNG_ERR_INVALID_PROTOCOL; |
| 755 | goto end; |
| 756 | } |
| 757 | |
| 758 | pid_array = (int32_t *) zmalloc(pid_count * sizeof(int32_t)); |
| 759 | if (!pid_array) { |
| 760 | ret_code = LTTNG_ERR_NOMEM; |
| 761 | goto end; |
| 762 | } |
| 763 | |
| 764 | /* Extract values to a raw array. */ |
| 765 | for (i = 0; i < pid_count; i++) { |
| 766 | pid_t pid; |
| 767 | const enum lttng_process_attr_values_status values_status = |
| 768 | lttng_process_attr_values_get_pid_at_index( |
| 769 | values, i, &pid); |
| 770 | |
| 771 | if (values_status != LTTNG_PROCESS_ATTR_VALUES_STATUS_OK) { |
| 772 | ret_code = LTTNG_ERR_UNK; |
| 773 | goto end; |
| 774 | } |
| 775 | pid_array[i] = (int32_t) pid; |
| 776 | } |
| 777 | *_nr_pids = (size_t) pid_count; |
| 778 | *_pids = pid_array; |
| 779 | pid_array = NULL; |
| 780 | end: |
| 781 | lttng_process_attr_tracker_handle_destroy(tracker_handle); |
| 782 | free(pid_array); |
| 783 | return ret_code == LTTNG_OK ? 0 : -ret_code; |
| 784 | } |