| 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 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License, version 2.1 only, |
| 11 | * as published by the Free Software Foundation. |
| 12 | * |
| 13 | * This library is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 16 | * Lesser General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU Lesser General Public License |
| 19 | * along with this library; if not, write to the Free Software Foundation, |
| 20 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 21 | */ |
| 22 | |
| 23 | #include <unistd.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <stdint.h> |
| 26 | #include <limits.h> |
| 27 | #include <errno.h> |
| 28 | #include <lttng/health-internal.h> |
| 29 | |
| 30 | #include <bin/lttng-sessiond/health-sessiond.h> |
| 31 | #include <bin/lttng-consumerd/health-consumerd.h> |
| 32 | #include <bin/lttng-relayd/health-relayd.h> |
| 33 | #include <common/defaults.h> |
| 34 | #include <common/utils.h> |
| 35 | |
| 36 | #include "lttng-ctl-helper.h" |
| 37 | |
| 38 | enum health_component { |
| 39 | HEALTH_COMPONENT_SESSIOND, |
| 40 | HEALTH_COMPONENT_CONSUMERD, |
| 41 | HEALTH_COMPONENT_RELAYD, |
| 42 | |
| 43 | NR_HEALTH_COMPONENT, |
| 44 | }; |
| 45 | |
| 46 | struct lttng_health_thread { |
| 47 | struct lttng_health *p; |
| 48 | int state; |
| 49 | }; |
| 50 | |
| 51 | struct lttng_health { |
| 52 | enum health_component component; |
| 53 | uint64_t state; |
| 54 | unsigned int nr_threads; |
| 55 | char health_sock_path[PATH_MAX]; |
| 56 | /* For consumer health only */ |
| 57 | enum lttng_health_consumerd consumerd_type; |
| 58 | struct lttng_health_thread thread[]; |
| 59 | }; |
| 60 | |
| 61 | static |
| 62 | const char *sessiond_thread_name[NR_HEALTH_SESSIOND_TYPES] = { |
| 63 | [ HEALTH_SESSIOND_TYPE_CMD ] = "Session daemon command", |
| 64 | [ HEALTH_SESSIOND_TYPE_APP_MANAGE ] = "Session daemon application manager", |
| 65 | [ HEALTH_SESSIOND_TYPE_APP_REG ] = "Session daemon application registration", |
| 66 | [ HEALTH_SESSIOND_TYPE_KERNEL ] = "Session daemon kernel", |
| 67 | [ HEALTH_SESSIOND_TYPE_CONSUMER ] = "Session daemon consumer manager", |
| 68 | [ HEALTH_SESSIOND_TYPE_HT_CLEANUP ] = "Session daemon hash table cleanup", |
| 69 | [ HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY ] = "Session daemon application notification manager", |
| 70 | [ HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH ] = "Session daemon application registration dispatcher", |
| 71 | }; |
| 72 | |
| 73 | static |
| 74 | const char *consumerd_thread_name[NR_HEALTH_CONSUMERD_TYPES] = { |
| 75 | [ HEALTH_CONSUMERD_TYPE_CHANNEL ] = "Consumer daemon channel", |
| 76 | [ HEALTH_CONSUMERD_TYPE_METADATA ] = "Consumer daemon metadata", |
| 77 | [ HEALTH_CONSUMERD_TYPE_DATA ] = "Consumer daemon data", |
| 78 | [ HEALTH_CONSUMERD_TYPE_SESSIOND ] = "Consumer daemon session daemon command manager", |
| 79 | [ HEALTH_CONSUMERD_TYPE_METADATA_TIMER ] = "Consumer daemon metadata timer", |
| 80 | }; |
| 81 | |
| 82 | static |
| 83 | const char *relayd_thread_name[NR_HEALTH_RELAYD_TYPES] = { |
| 84 | [ HEALTH_RELAYD_TYPE_DISPATCHER ] = "Relay daemon dispatcher", |
| 85 | [ HEALTH_RELAYD_TYPE_WORKER ] = "Relay daemon worker", |
| 86 | [ HEALTH_RELAYD_TYPE_LISTENER ] = "Relay daemon listener", |
| 87 | [ HEALTH_RELAYD_TYPE_LIVE_DISPATCHER ] = "Relay daemon live dispatcher", |
| 88 | [ HEALTH_RELAYD_TYPE_LIVE_WORKER ] = "Relay daemon live worker", |
| 89 | [ HEALTH_RELAYD_TYPE_LIVE_LISTENER ] = "Relay daemon live listener", |
| 90 | }; |
| 91 | |
| 92 | static |
| 93 | const char **thread_name[NR_HEALTH_COMPONENT] = { |
| 94 | [ HEALTH_COMPONENT_SESSIOND ] = sessiond_thread_name, |
| 95 | [ HEALTH_COMPONENT_CONSUMERD] = consumerd_thread_name, |
| 96 | [ HEALTH_COMPONENT_RELAYD ] = relayd_thread_name, |
| 97 | }; |
| 98 | |
| 99 | /* |
| 100 | * Set health socket path. |
| 101 | * |
| 102 | * Returns 0 on success or -ENOMEM. |
| 103 | */ |
| 104 | static |
| 105 | int set_health_socket_path(struct lttng_health *lh, |
| 106 | int tracing_group) |
| 107 | { |
| 108 | uid_t uid; |
| 109 | const char *home; |
| 110 | int ret; |
| 111 | /* Global and home format strings */ |
| 112 | const char *global_str, *home_str; |
| 113 | |
| 114 | switch (lh->component) { |
| 115 | case HEALTH_COMPONENT_SESSIOND: |
| 116 | global_str = DEFAULT_GLOBAL_HEALTH_UNIX_SOCK; |
| 117 | home_str = DEFAULT_HOME_HEALTH_UNIX_SOCK; |
| 118 | break; |
| 119 | case HEALTH_COMPONENT_CONSUMERD: |
| 120 | switch (lh->consumerd_type) { |
| 121 | case LTTNG_HEALTH_CONSUMERD_UST_32: |
| 122 | global_str = DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK; |
| 123 | home_str = DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK; |
| 124 | break; |
| 125 | case LTTNG_HEALTH_CONSUMERD_UST_64: |
| 126 | global_str = DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK; |
| 127 | home_str = DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK; |
| 128 | break; |
| 129 | case LTTNG_HEALTH_CONSUMERD_KERNEL: |
| 130 | global_str = DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK; |
| 131 | home_str = DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK; |
| 132 | break; |
| 133 | default: |
| 134 | return -EINVAL; |
| 135 | } |
| 136 | break; |
| 137 | case HEALTH_COMPONENT_RELAYD: |
| 138 | if (lh->health_sock_path[0] == '\0') { |
| 139 | return -EINVAL; |
| 140 | } else { |
| 141 | return 0; |
| 142 | } |
| 143 | break; /* Unreached */ |
| 144 | default: |
| 145 | return -EINVAL; |
| 146 | } |
| 147 | |
| 148 | uid = getuid(); |
| 149 | |
| 150 | if (uid == 0 || tracing_group) { |
| 151 | lttng_ctl_copy_string(lh->health_sock_path, |
| 152 | global_str, |
| 153 | sizeof(lh->health_sock_path)); |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * With GNU C < 2.1, snprintf returns -1 if the target buffer |
| 159 | * is too small; With GNU C >= 2.1, snprintf returns the |
| 160 | * required size (excluding closing null). |
| 161 | */ |
| 162 | home = utils_get_home_dir(); |
| 163 | if (home == NULL) { |
| 164 | /* Fallback in /tmp */ |
| 165 | home = "/tmp"; |
| 166 | } |
| 167 | |
| 168 | ret = snprintf(lh->health_sock_path, sizeof(lh->health_sock_path), |
| 169 | home_str, home); |
| 170 | if ((ret < 0) || (ret >= sizeof(lh->health_sock_path))) { |
| 171 | return -ENOMEM; |
| 172 | } |
| 173 | |
| 174 | return 0; |
| 175 | } |
| 176 | |
| 177 | static |
| 178 | struct lttng_health *lttng_health_create(enum health_component hc, |
| 179 | unsigned int nr_threads) |
| 180 | { |
| 181 | struct lttng_health *lh; |
| 182 | int i; |
| 183 | |
| 184 | lh = zmalloc(sizeof(*lh) + sizeof(lh->thread[0]) * nr_threads); |
| 185 | if (!lh) { |
| 186 | return NULL; |
| 187 | } |
| 188 | |
| 189 | lh->component = hc; |
| 190 | lh->state = UINT64_MAX; /* All bits in error initially */ |
| 191 | lh->nr_threads = nr_threads; |
| 192 | for (i = 0; i < nr_threads; i++) { |
| 193 | lh->thread[i].p = lh; |
| 194 | } |
| 195 | return lh; |
| 196 | } |
| 197 | |
| 198 | struct lttng_health *lttng_health_create_sessiond(void) |
| 199 | { |
| 200 | struct lttng_health *lh; |
| 201 | |
| 202 | lh = lttng_health_create(HEALTH_COMPONENT_SESSIOND, |
| 203 | NR_HEALTH_SESSIOND_TYPES); |
| 204 | if (!lh) { |
| 205 | return NULL; |
| 206 | } |
| 207 | return lh; |
| 208 | } |
| 209 | |
| 210 | struct lttng_health * |
| 211 | lttng_health_create_consumerd(enum lttng_health_consumerd consumerd) |
| 212 | { |
| 213 | struct lttng_health *lh; |
| 214 | |
| 215 | lh = lttng_health_create(HEALTH_COMPONENT_CONSUMERD, |
| 216 | NR_HEALTH_CONSUMERD_TYPES); |
| 217 | if (!lh) { |
| 218 | return NULL; |
| 219 | } |
| 220 | lh->consumerd_type = consumerd; |
| 221 | return lh; |
| 222 | } |
| 223 | |
| 224 | struct lttng_health *lttng_health_create_relayd(const char *path) |
| 225 | { |
| 226 | struct lttng_health *lh; |
| 227 | |
| 228 | if (!path) { |
| 229 | return NULL; |
| 230 | } |
| 231 | |
| 232 | lh = lttng_health_create(HEALTH_COMPONENT_RELAYD, |
| 233 | NR_HEALTH_RELAYD_TYPES); |
| 234 | if (!lh) { |
| 235 | return NULL; |
| 236 | } |
| 237 | lttng_ctl_copy_string(lh->health_sock_path, path, |
| 238 | sizeof(lh->health_sock_path)); |
| 239 | return lh; |
| 240 | } |
| 241 | |
| 242 | void lttng_health_destroy(struct lttng_health *lh) |
| 243 | { |
| 244 | free(lh); |
| 245 | } |
| 246 | |
| 247 | int lttng_health_query(struct lttng_health *health) |
| 248 | { |
| 249 | int sock, ret, i, tracing_group; |
| 250 | struct health_comm_msg msg; |
| 251 | struct health_comm_reply reply; |
| 252 | |
| 253 | if (!health) { |
| 254 | return -EINVAL; |
| 255 | } |
| 256 | |
| 257 | tracing_group = lttng_check_tracing_group(); |
| 258 | retry: |
| 259 | ret = set_health_socket_path(health, tracing_group); |
| 260 | if (ret) { |
| 261 | goto error; |
| 262 | } |
| 263 | /* Connect to component */ |
| 264 | sock = lttcomm_connect_unix_sock(health->health_sock_path); |
| 265 | if (sock < 0) { |
| 266 | if (tracing_group) { |
| 267 | /* For tracing group, fallback to per-user */ |
| 268 | tracing_group = 0; |
| 269 | goto retry; |
| 270 | } |
| 271 | ret = -1; |
| 272 | goto error; |
| 273 | } |
| 274 | |
| 275 | memset(&msg, 0, sizeof(msg)); |
| 276 | msg.cmd = HEALTH_CMD_CHECK; |
| 277 | |
| 278 | ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg)); |
| 279 | if (ret < 0) { |
| 280 | ret = -1; |
| 281 | goto close_error; |
| 282 | } |
| 283 | |
| 284 | ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply)); |
| 285 | if (ret < 0) { |
| 286 | ret = -1; |
| 287 | goto close_error; |
| 288 | } |
| 289 | |
| 290 | health->state = reply.ret_code; |
| 291 | for (i = 0; i < health->nr_threads; i++) { |
| 292 | if (health->state & (1ULL << i)) { |
| 293 | health->thread[i].state = -1; |
| 294 | } else { |
| 295 | health->thread[i].state = 0; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | close_error: |
| 300 | { |
| 301 | int closeret; |
| 302 | |
| 303 | closeret = close(sock); |
| 304 | assert(!closeret); |
| 305 | } |
| 306 | |
| 307 | error: |
| 308 | if (ret >= 0) |
| 309 | ret = 0; |
| 310 | return ret; |
| 311 | } |
| 312 | |
| 313 | int lttng_health_state(const struct lttng_health *health) |
| 314 | { |
| 315 | if (!health) { |
| 316 | return -EINVAL; |
| 317 | } |
| 318 | |
| 319 | if (health->state == 0) { |
| 320 | return 0; |
| 321 | } else { |
| 322 | return -1; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | int lttng_health_get_nr_threads(const struct lttng_health *health) |
| 327 | { |
| 328 | if (!health) { |
| 329 | return -EINVAL; |
| 330 | } |
| 331 | return health->nr_threads; |
| 332 | } |
| 333 | |
| 334 | const struct lttng_health_thread * |
| 335 | lttng_health_get_thread(const struct lttng_health *health, |
| 336 | unsigned int nth_thread) |
| 337 | { |
| 338 | if (!health || nth_thread >= health->nr_threads) { |
| 339 | return NULL; |
| 340 | } |
| 341 | return &health->thread[nth_thread]; |
| 342 | } |
| 343 | |
| 344 | int lttng_health_thread_state(const struct lttng_health_thread *thread) |
| 345 | { |
| 346 | if (!thread) { |
| 347 | return -EINVAL; |
| 348 | } |
| 349 | return thread->state; |
| 350 | } |
| 351 | |
| 352 | const char *lttng_health_thread_name(const struct lttng_health_thread *thread) |
| 353 | { |
| 354 | unsigned int nr; |
| 355 | |
| 356 | if (!thread) { |
| 357 | return NULL; |
| 358 | } |
| 359 | nr = thread - &thread->p->thread[0]; |
| 360 | return thread_name[thread->p->component][nr]; |
| 361 | } |