| 1 | /* |
| 2 | * lttng-ctl-health.c |
| 3 | * |
| 4 | * Linux Trace Toolkit Health Control Library |
| 5 | * |
| 6 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
| 7 | * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 8 | * |
| 9 | * SPDX-License-Identifier: LGPL-2.1-only |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #define _LGPL_SOURCE |
| 14 | #include <unistd.h> |
| 15 | #include <sys/types.h> |
| 16 | #include <stdint.h> |
| 17 | #include <limits.h> |
| 18 | #include <errno.h> |
| 19 | #include <string.h> |
| 20 | #include <lttng/health-internal.h> |
| 21 | |
| 22 | #include <bin/lttng-sessiond/health-sessiond.h> |
| 23 | #include <bin/lttng-consumerd/health-consumerd.h> |
| 24 | #include <bin/lttng-relayd/health-relayd.h> |
| 25 | #include <common/defaults.h> |
| 26 | #include <common/utils.h> |
| 27 | |
| 28 | #include "lttng-ctl-helper.h" |
| 29 | |
| 30 | enum health_component { |
| 31 | HEALTH_COMPONENT_SESSIOND, |
| 32 | HEALTH_COMPONENT_CONSUMERD, |
| 33 | HEALTH_COMPONENT_RELAYD, |
| 34 | |
| 35 | NR_HEALTH_COMPONENT, |
| 36 | }; |
| 37 | |
| 38 | struct lttng_health_thread { |
| 39 | struct lttng_health *p; |
| 40 | int state; |
| 41 | }; |
| 42 | |
| 43 | struct lttng_health { |
| 44 | enum health_component component; |
| 45 | uint64_t state; |
| 46 | unsigned int nr_threads; |
| 47 | char health_sock_path[PATH_MAX]; |
| 48 | /* For consumer health only */ |
| 49 | enum lttng_health_consumerd consumerd_type; |
| 50 | struct lttng_health_thread thread[]; |
| 51 | }; |
| 52 | |
| 53 | static |
| 54 | const char *sessiond_thread_name[NR_HEALTH_SESSIOND_TYPES] = { |
| 55 | [ HEALTH_SESSIOND_TYPE_CMD ] = "Session daemon command", |
| 56 | [ HEALTH_SESSIOND_TYPE_APP_MANAGE ] = "Session daemon application manager", |
| 57 | [ HEALTH_SESSIOND_TYPE_APP_REG ] = "Session daemon application registration", |
| 58 | [ HEALTH_SESSIOND_TYPE_KERNEL ] = "Session daemon kernel", |
| 59 | [ HEALTH_SESSIOND_TYPE_CONSUMER ] = "Session daemon consumer manager", |
| 60 | [ HEALTH_SESSIOND_TYPE_HT_CLEANUP ] = "Session daemon hash table cleanup", |
| 61 | [ HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY ] = "Session daemon application notification manager", |
| 62 | [ HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH ] = "Session daemon application registration dispatcher", |
| 63 | [ HEALTH_SESSIOND_TYPE_ROTATION ] = "Session daemon rotation manager", |
| 64 | [ HEALTH_SESSIOND_TYPE_TIMER ] = "Session daemon timer manager", |
| 65 | }; |
| 66 | |
| 67 | static |
| 68 | const char *consumerd_thread_name[NR_HEALTH_CONSUMERD_TYPES] = { |
| 69 | [ HEALTH_CONSUMERD_TYPE_CHANNEL ] = "Consumer daemon channel", |
| 70 | [ HEALTH_CONSUMERD_TYPE_METADATA ] = "Consumer daemon metadata", |
| 71 | [ HEALTH_CONSUMERD_TYPE_DATA ] = "Consumer daemon data", |
| 72 | [ HEALTH_CONSUMERD_TYPE_SESSIOND ] = "Consumer daemon session daemon command manager", |
| 73 | [ HEALTH_CONSUMERD_TYPE_METADATA_TIMER ] = "Consumer daemon metadata timer", |
| 74 | }; |
| 75 | |
| 76 | static |
| 77 | const char *relayd_thread_name[NR_HEALTH_RELAYD_TYPES] = { |
| 78 | [ HEALTH_RELAYD_TYPE_DISPATCHER ] = "Relay daemon dispatcher", |
| 79 | [ HEALTH_RELAYD_TYPE_WORKER ] = "Relay daemon worker", |
| 80 | [ HEALTH_RELAYD_TYPE_LISTENER ] = "Relay daemon listener", |
| 81 | [ HEALTH_RELAYD_TYPE_LIVE_DISPATCHER ] = "Relay daemon live dispatcher", |
| 82 | [ HEALTH_RELAYD_TYPE_LIVE_WORKER ] = "Relay daemon live worker", |
| 83 | [ HEALTH_RELAYD_TYPE_LIVE_LISTENER ] = "Relay daemon live listener", |
| 84 | }; |
| 85 | |
| 86 | static |
| 87 | const char **thread_name[NR_HEALTH_COMPONENT] = { |
| 88 | [ HEALTH_COMPONENT_SESSIOND ] = sessiond_thread_name, |
| 89 | [ HEALTH_COMPONENT_CONSUMERD] = consumerd_thread_name, |
| 90 | [ HEALTH_COMPONENT_RELAYD ] = relayd_thread_name, |
| 91 | }; |
| 92 | |
| 93 | /* |
| 94 | * Set health socket path. |
| 95 | * |
| 96 | * Returns 0 on success or -ENOMEM. |
| 97 | */ |
| 98 | static |
| 99 | int set_health_socket_path(struct lttng_health *lh, |
| 100 | int tracing_group) |
| 101 | { |
| 102 | uid_t uid; |
| 103 | const char *home; |
| 104 | int ret; |
| 105 | /* Global and home format strings */ |
| 106 | const char *global_str, *home_str; |
| 107 | |
| 108 | switch (lh->component) { |
| 109 | case HEALTH_COMPONENT_SESSIOND: |
| 110 | global_str = DEFAULT_GLOBAL_HEALTH_UNIX_SOCK; |
| 111 | home_str = DEFAULT_HOME_HEALTH_UNIX_SOCK; |
| 112 | break; |
| 113 | case HEALTH_COMPONENT_CONSUMERD: |
| 114 | switch (lh->consumerd_type) { |
| 115 | case LTTNG_HEALTH_CONSUMERD_UST_32: |
| 116 | global_str = DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK; |
| 117 | home_str = DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK; |
| 118 | break; |
| 119 | case LTTNG_HEALTH_CONSUMERD_UST_64: |
| 120 | global_str = DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK; |
| 121 | home_str = DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK; |
| 122 | break; |
| 123 | case LTTNG_HEALTH_CONSUMERD_KERNEL: |
| 124 | global_str = DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK; |
| 125 | home_str = DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK; |
| 126 | break; |
| 127 | default: |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | break; |
| 131 | case HEALTH_COMPONENT_RELAYD: |
| 132 | if (lh->health_sock_path[0] == '\0') { |
| 133 | return -EINVAL; |
| 134 | } else { |
| 135 | return 0; |
| 136 | } |
| 137 | break; /* Unreached */ |
| 138 | default: |
| 139 | return -EINVAL; |
| 140 | } |
| 141 | |
| 142 | uid = getuid(); |
| 143 | |
| 144 | if (uid == 0 || tracing_group) { |
| 145 | lttng_ctl_copy_string(lh->health_sock_path, |
| 146 | global_str, |
| 147 | sizeof(lh->health_sock_path)); |
| 148 | return 0; |
| 149 | } |
| 150 | |
| 151 | /* |
| 152 | * With GNU C < 2.1, snprintf returns -1 if the target buffer |
| 153 | * is too small; With GNU C >= 2.1, snprintf returns the |
| 154 | * required size (excluding closing null). |
| 155 | */ |
| 156 | home = utils_get_home_dir(); |
| 157 | if (home == NULL) { |
| 158 | /* Fallback in /tmp */ |
| 159 | home = "/tmp"; |
| 160 | } |
| 161 | |
| 162 | ret = snprintf(lh->health_sock_path, sizeof(lh->health_sock_path), |
| 163 | home_str, home); |
| 164 | if ((ret < 0) || (ret >= sizeof(lh->health_sock_path))) { |
| 165 | return -ENOMEM; |
| 166 | } |
| 167 | |
| 168 | return 0; |
| 169 | } |
| 170 | |
| 171 | static |
| 172 | struct lttng_health *lttng_health_create(enum health_component hc, |
| 173 | unsigned int nr_threads) |
| 174 | { |
| 175 | struct lttng_health *lh; |
| 176 | int i; |
| 177 | |
| 178 | lh = zmalloc(sizeof(*lh) + sizeof(lh->thread[0]) * nr_threads); |
| 179 | if (!lh) { |
| 180 | return NULL; |
| 181 | } |
| 182 | |
| 183 | lh->component = hc; |
| 184 | lh->state = UINT64_MAX; /* All bits in error initially */ |
| 185 | lh->nr_threads = nr_threads; |
| 186 | for (i = 0; i < nr_threads; i++) { |
| 187 | lh->thread[i].p = lh; |
| 188 | } |
| 189 | return lh; |
| 190 | } |
| 191 | |
| 192 | struct lttng_health *lttng_health_create_sessiond(void) |
| 193 | { |
| 194 | struct lttng_health *lh; |
| 195 | |
| 196 | lh = lttng_health_create(HEALTH_COMPONENT_SESSIOND, |
| 197 | NR_HEALTH_SESSIOND_TYPES); |
| 198 | if (!lh) { |
| 199 | return NULL; |
| 200 | } |
| 201 | return lh; |
| 202 | } |
| 203 | |
| 204 | struct lttng_health * |
| 205 | lttng_health_create_consumerd(enum lttng_health_consumerd consumerd) |
| 206 | { |
| 207 | struct lttng_health *lh; |
| 208 | |
| 209 | lh = lttng_health_create(HEALTH_COMPONENT_CONSUMERD, |
| 210 | NR_HEALTH_CONSUMERD_TYPES); |
| 211 | if (!lh) { |
| 212 | return NULL; |
| 213 | } |
| 214 | lh->consumerd_type = consumerd; |
| 215 | return lh; |
| 216 | } |
| 217 | |
| 218 | struct lttng_health *lttng_health_create_relayd(const char *path) |
| 219 | { |
| 220 | struct lttng_health *lh; |
| 221 | |
| 222 | if (!path) { |
| 223 | return NULL; |
| 224 | } |
| 225 | |
| 226 | lh = lttng_health_create(HEALTH_COMPONENT_RELAYD, |
| 227 | NR_HEALTH_RELAYD_TYPES); |
| 228 | if (!lh) { |
| 229 | return NULL; |
| 230 | } |
| 231 | lttng_ctl_copy_string(lh->health_sock_path, path, |
| 232 | sizeof(lh->health_sock_path)); |
| 233 | return lh; |
| 234 | } |
| 235 | |
| 236 | void lttng_health_destroy(struct lttng_health *lh) |
| 237 | { |
| 238 | free(lh); |
| 239 | } |
| 240 | |
| 241 | int lttng_health_query(struct lttng_health *health) |
| 242 | { |
| 243 | int sock, ret, i, tracing_group; |
| 244 | struct health_comm_msg msg; |
| 245 | struct health_comm_reply reply; |
| 246 | |
| 247 | if (!health) { |
| 248 | return -EINVAL; |
| 249 | } |
| 250 | |
| 251 | tracing_group = lttng_check_tracing_group(); |
| 252 | retry: |
| 253 | ret = set_health_socket_path(health, tracing_group); |
| 254 | if (ret) { |
| 255 | goto error; |
| 256 | } |
| 257 | /* Connect to component */ |
| 258 | sock = lttcomm_connect_unix_sock(health->health_sock_path); |
| 259 | if (sock < 0) { |
| 260 | if (tracing_group) { |
| 261 | /* For tracing group, fallback to per-user */ |
| 262 | tracing_group = 0; |
| 263 | goto retry; |
| 264 | } |
| 265 | ret = -1; |
| 266 | goto error; |
| 267 | } |
| 268 | |
| 269 | memset(&msg, 0, sizeof(msg)); |
| 270 | msg.cmd = HEALTH_CMD_CHECK; |
| 271 | |
| 272 | ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg)); |
| 273 | if (ret < 0) { |
| 274 | ret = -1; |
| 275 | goto close_error; |
| 276 | } |
| 277 | |
| 278 | ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply)); |
| 279 | if (ret < 0) { |
| 280 | ret = -1; |
| 281 | goto close_error; |
| 282 | } |
| 283 | |
| 284 | health->state = reply.ret_code; |
| 285 | for (i = 0; i < health->nr_threads; i++) { |
| 286 | if (health->state & (1ULL << i)) { |
| 287 | health->thread[i].state = -1; |
| 288 | } else { |
| 289 | health->thread[i].state = 0; |
| 290 | } |
| 291 | } |
| 292 | |
| 293 | close_error: |
| 294 | { |
| 295 | int closeret; |
| 296 | |
| 297 | closeret = close(sock); |
| 298 | assert(!closeret); |
| 299 | } |
| 300 | |
| 301 | error: |
| 302 | if (ret >= 0) |
| 303 | ret = 0; |
| 304 | return ret; |
| 305 | } |
| 306 | |
| 307 | int lttng_health_state(const struct lttng_health *health) |
| 308 | { |
| 309 | if (!health) { |
| 310 | return -EINVAL; |
| 311 | } |
| 312 | |
| 313 | if (health->state == 0) { |
| 314 | return 0; |
| 315 | } else { |
| 316 | return -1; |
| 317 | } |
| 318 | } |
| 319 | |
| 320 | int lttng_health_get_nr_threads(const struct lttng_health *health) |
| 321 | { |
| 322 | if (!health) { |
| 323 | return -EINVAL; |
| 324 | } |
| 325 | return health->nr_threads; |
| 326 | } |
| 327 | |
| 328 | const struct lttng_health_thread * |
| 329 | lttng_health_get_thread(const struct lttng_health *health, |
| 330 | unsigned int nth_thread) |
| 331 | { |
| 332 | if (!health || nth_thread >= health->nr_threads) { |
| 333 | return NULL; |
| 334 | } |
| 335 | return &health->thread[nth_thread]; |
| 336 | } |
| 337 | |
| 338 | int lttng_health_thread_state(const struct lttng_health_thread *thread) |
| 339 | { |
| 340 | if (!thread) { |
| 341 | return -EINVAL; |
| 342 | } |
| 343 | return thread->state; |
| 344 | } |
| 345 | |
| 346 | const char *lttng_health_thread_name(const struct lttng_health_thread *thread) |
| 347 | { |
| 348 | unsigned int nr; |
| 349 | |
| 350 | if (!thread) { |
| 351 | return NULL; |
| 352 | } |
| 353 | nr = thread - &thread->p->thread[0]; |
| 354 | return thread_name[thread->p->component][nr]; |
| 355 | } |