src/bin/lttng/commands/disable_events.cpp

   1 /*
   2  * Copyright (C) 2011 EfficiOS Inc.
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #define _LGPL_SOURCE
   9 #include "../command.hpp"
  10
  11 #include <common/mi-lttng.hpp>
  12
  13 #include <lttng/domain-internal.hpp>
  14
  15 #include <popt.h>
  16 #include <stdio.h>
  17 #include <stdlib.h>
  18 #include <string.h>
  19 #include <sys/stat.h>
  20 #include <sys/types.h>
  21 #include <unistd.h>
  22
  23 static int opt_kernel;
  24 static char *opt_channel_name;
  25 static char *opt_session_name;
  26 static int opt_userspace;
  27 static int opt_disable_all;
  28 static int opt_jul;
  29 static int opt_log4j;
  30 static int opt_python;
  31 static int opt_event_type;
  32
  33 #ifdef LTTNG_EMBED_HELP
  34 static const char help_msg[] =
  35 #include <lttng-disable-event.1.h>
  36         ;
  37 #endif
  38
  39 enum {
  40         OPT_HELP = 1,
  41         OPT_TYPE_SYSCALL,
  42         OPT_TYPE_TRACEPOINT,
  43         OPT_TYPE_PROBE,
  44         OPT_TYPE_FUNCTION,
  45         OPT_TYPE_ALL,
  46         OPT_LIST_OPTIONS,
  47 };
  48
  49 static struct lttng_handle *handle;
  50 static struct mi_writer *writer;
  51
  52 static struct poptOption long_options[] = {
  53         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  54         { "help", 'h', POPT_ARG_NONE, nullptr, OPT_HELP, nullptr, nullptr },
  55         { "session", 's', POPT_ARG_STRING, &opt_session_name, 0, nullptr, nullptr },
  56         { "all-events", 'a', POPT_ARG_VAL, &opt_disable_all, 1, nullptr, nullptr },
  57         { "channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, nullptr, nullptr },
  58         { "jul", 'j', POPT_ARG_VAL, &opt_jul, 1, nullptr, nullptr },
  59         { "log4j", 'l', POPT_ARG_VAL, &opt_log4j, 1, nullptr, nullptr },
  60         { "python", 'p', POPT_ARG_VAL, &opt_python, 1, nullptr, nullptr },
  61         { "kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, nullptr, nullptr },
  62         { "userspace", 'u', POPT_ARG_VAL, &opt_userspace, 1, nullptr, nullptr },
  63         { "syscall", 0, POPT_ARG_NONE, nullptr, OPT_TYPE_SYSCALL, nullptr, nullptr },
  64         { "probe", 0, POPT_ARG_NONE, nullptr, OPT_TYPE_PROBE, nullptr, nullptr },
  65         { "tracepoint", 0, POPT_ARG_NONE, nullptr, OPT_TYPE_TRACEPOINT, nullptr, nullptr },
  66         { "function", 0, POPT_ARG_NONE, nullptr, OPT_TYPE_FUNCTION, nullptr, nullptr },
  67         { "all", 0, POPT_ARG_NONE, nullptr, OPT_TYPE_ALL, nullptr, nullptr },
  68         { "list-options", 0, POPT_ARG_NONE, nullptr, OPT_LIST_OPTIONS, nullptr, nullptr },
  69         { nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
  70 };
  71
  72 static const char *print_channel_name(const char *name)
  73 {
  74         return name ?: DEFAULT_CHANNEL_NAME;
  75 }
  76
  77 static const char *print_raw_channel_name(const char *name)
  78 {
  79         return name ?: "<default>";
  80 }
  81
  82 static const char *print_event_type(const enum lttng_event_type ev_type)
  83 {
  84         switch (ev_type) {
  85         case LTTNG_EVENT_ALL:
  86                 return "any";
  87         case LTTNG_EVENT_TRACEPOINT:
  88                 return "tracepoint";
  89         case LTTNG_EVENT_PROBE:
  90                 return "probe";
  91         case LTTNG_EVENT_FUNCTION:
  92                 return "function";
  93         case LTTNG_EVENT_FUNCTION_ENTRY:
  94                 return "function entry";
  95         case LTTNG_EVENT_SYSCALL:
  96                 return "syscall";
  97         default:
  98                 return "";
  99         }
 100 }
 101
 102 /* Mi print a partial event.
 103  * enabled is 0 or 1
 104  * success is 0 or 1
 105  */
 106 static int mi_print_event(const char *event_name, int enabled, int success)
 107 {
 108         int ret;
 109
 110         LTTNG_ASSERT(writer);
 111         LTTNG_ASSERT(event_name);
 112
 113         /* Open event element */
 114         ret = mi_lttng_writer_open_element(writer, config_element_event);
 115         if (ret) {
 116                 goto end;
 117         }
 118
 119         /* Print the name of event */
 120         ret = mi_lttng_writer_write_element_string(writer, config_element_name, event_name);
 121         if (ret) {
 122                 goto end;
 123         }
 124
 125         /* Print enabled ? */
 126         ret = mi_lttng_writer_write_element_bool(writer, config_element_enabled, enabled);
 127         if (ret) {
 128                 goto end;
 129         }
 130
 131         /* Success ? */
 132         ret = mi_lttng_writer_write_element_bool(writer, mi_lttng_element_command_success, success);
 133         if (ret) {
 134                 goto end;
 135         }
 136
 137         /* Close event element */
 138         ret = mi_lttng_writer_close_element(writer);
 139 end:
 140         return ret;
 141 }
 142
 143 /*
 144  *  disable_events
 145  *
 146  *  Disabling event using the lttng API.
 147  */
 148 static int disable_events(char *session_name, char *event_list)
 149 {
 150         enum cmd_error_code ret = CMD_SUCCESS, command_ret = CMD_SUCCESS;
 151         bool enabled = true, success = true, warn = false;
 152         char *event_name, *channel_name = nullptr;
 153         struct lttng_domain dom;
 154         struct lttng_event event;
 155
 156         memset(&dom, 0, sizeof(dom));
 157
 158         /* Create lttng domain */
 159         if (opt_kernel) {
 160                 dom.type = LTTNG_DOMAIN_KERNEL;
 161         } else if (opt_userspace) {
 162                 dom.type = LTTNG_DOMAIN_UST;
 163         } else if (opt_jul) {
 164                 dom.type = LTTNG_DOMAIN_JUL;
 165         } else if (opt_log4j) {
 166                 dom.type = LTTNG_DOMAIN_LOG4J;
 167         } else if (opt_python) {
 168                 dom.type = LTTNG_DOMAIN_PYTHON;
 169         } else {
 170                 /* Checked by the caller. */
 171                 abort();
 172         }
 173
 174         channel_name = opt_channel_name;
 175
 176         handle = lttng_create_handle(session_name, &dom);
 177         if (handle == nullptr) {
 178                 ret = CMD_ERROR;
 179                 goto error;
 180         }
 181
 182         /* Mi print the channel and open the events element */
 183         if (lttng_opt_mi) {
 184                 int mi_ret = mi_lttng_writer_open_element(writer, config_element_channel);
 185                 if (mi_ret) {
 186                         ret = CMD_ERROR;
 187                         goto end;
 188                 }
 189
 190                 mi_ret = mi_lttng_writer_write_element_string(
 191                         writer, config_element_name, print_channel_name(channel_name));
 192                 if (mi_ret) {
 193                         ret = CMD_ERROR;
 194                         goto end;
 195                 }
 196
 197                 /* Open events element */
 198                 mi_ret = mi_lttng_writer_open_element(writer, config_element_events);
 199                 if (mi_ret) {
 200                         ret = CMD_ERROR;
 201                         goto end;
 202                 }
 203         }
 204
 205         memset(&event, 0, sizeof(event));
 206         /* Set default loglevel to any/unknown */
 207         event.loglevel = -1;
 208
 209         /* opt_event_type contain the event type to disable at this point */
 210         event.type = (lttng_event_type) opt_event_type;
 211
 212         if (opt_disable_all) {
 213                 const int disable_ret = lttng_disable_event_ext(handle, &event, channel_name, nullptr);
 214
 215                 if (disable_ret < 0) {
 216                         ERR("%s", lttng_strerror(command_ret));
 217                         command_ret = CMD_ERROR;
 218                         enabled = true;
 219                         success = false;
 220                 } else {
 221                         enabled = false;
 222                         success = true;
 223                         MSG("All %s events of type %s are disabled in channel %s",
 224                             lttng_domain_type_str(dom.type),
 225                             print_event_type((lttng_event_type) opt_event_type),
 226                             print_channel_name(channel_name));
 227                 }
 228
 229                 if (lttng_opt_mi) {
 230                         const int mi_ret = mi_print_event("*", enabled, success);
 231
 232                         if (mi_ret) {
 233                                 ret = CMD_ERROR;
 234                                 goto error;
 235                         }
 236                 }
 237         } else {
 238                 /* Strip event list */
 239                 event_name = strtok(event_list, ",");
 240                 while (event_name != nullptr) {
 241                         DBG("Disabling event %s", event_name);
 242
 243                         strncpy(event.name, event_name, sizeof(event.name));
 244                         event.name[sizeof(event.name) - 1] = '\0';
 245                         const int disable_ret =
 246                                 lttng_disable_event_ext(handle, &event, channel_name, nullptr);
 247                         if (disable_ret < 0) {
 248                                 ERR("%s of type %s : %s (channel %s, session %s)",
 249                                     event_name,
 250                                     print_event_type((lttng_event_type) opt_event_type),
 251                                     lttng_strerror(command_ret),
 252                                     command_ret == -LTTNG_ERR_NEED_CHANNEL_NAME ?
 253                                             print_raw_channel_name(channel_name) :
 254                                             print_channel_name(channel_name),
 255                                     session_name);
 256                                 warn = true;
 257                                 success = false;
 258                                 /*
 259                                  * If an error occurred we assume that the event is still
 260                                  * enabled.
 261                                  */
 262                                 enabled = true;
 263                                 command_ret = CMD_ERROR;
 264                         } else {
 265                                 MSG("%s %s of type %s disabled in channel %s for session %s",
 266                                     lttng_domain_type_str(dom.type),
 267                                     event_name,
 268                                     print_event_type((lttng_event_type) opt_event_type),
 269                                     print_channel_name(channel_name),
 270                                     session_name);
 271                                 success = true;
 272                                 enabled = false;
 273                         }
 274
 275                         if (lttng_opt_mi) {
 276                                 const int mi_ret = mi_print_event(event_name, enabled, success);
 277
 278                                 if (mi_ret) {
 279                                         ret = CMD_ERROR;
 280                                         goto error;
 281                                 }
 282                         }
 283
 284                         /* Next event */
 285                         event_name = strtok(nullptr, ",");
 286                 }
 287         }
 288
 289 end:
 290         if (lttng_opt_mi) {
 291                 /* Close events element and channel element */
 292                 const int mi_ret = mi_lttng_close_multi_element(writer, 2);
 293
 294                 if (mi_ret) {
 295                         ret = CMD_ERROR;
 296                 }
 297         }
 298 error:
 299         /* if there is already an error preserve it */
 300         if (warn && !ret) {
 301                 ret = CMD_WARNING;
 302         }
 303
 304         /* Overwrite ret if an error occurred */
 305         ret = command_ret ? command_ret : ret;
 306
 307         lttng_destroy_handle(handle);
 308         return ret;
 309 }
 310
 311 /*
 312  *  cmd_disable_events
 313  *
 314  *  Disable event to trace session
 315  */
 316 int cmd_disable_events(int argc, const char **argv)
 317 {
 318         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
 319         static poptContext pc;
 320         char *session_name = nullptr;
 321         char *event_list = nullptr;
 322         const char *arg_event_list = nullptr;
 323         const char *leftover = nullptr;
 324         int event_type = -1;
 325
 326         pc = poptGetContext(nullptr, argc, argv, long_options, 0);
 327         poptReadDefaultConfig(pc, 0);
 328
 329         /* Default event type */
 330         opt_event_type = LTTNG_EVENT_ALL;
 331
 332         while ((opt = poptGetNextOpt(pc)) != -1) {
 333                 switch (opt) {
 334                 case OPT_HELP:
 335                         SHOW_HELP();
 336                         goto end;
 337                 case OPT_TYPE_SYSCALL:
 338                         opt_event_type = LTTNG_EVENT_SYSCALL;
 339                         break;
 340                 case OPT_TYPE_TRACEPOINT:
 341                         opt_event_type = LTTNG_EVENT_TRACEPOINT;
 342                         break;
 343                 case OPT_TYPE_PROBE:
 344                         opt_event_type = LTTNG_EVENT_PROBE;
 345                         break;
 346                 case OPT_TYPE_FUNCTION:
 347                         opt_event_type = LTTNG_EVENT_FUNCTION;
 348                         break;
 349                 case OPT_TYPE_ALL:
 350                         opt_event_type = LTTNG_EVENT_ALL;
 351                         break;
 352                 case OPT_LIST_OPTIONS:
 353                         list_cmd_options(stdout, long_options);
 354                         goto end;
 355                 default:
 356                         ret = CMD_UNDEFINED;
 357                         goto end;
 358                 }
 359
 360                 /* Validate event type. Multiple event type are not supported. */
 361                 if (event_type == -1) {
 362                         event_type = opt_event_type;
 363                 } else {
 364                         if (event_type != opt_event_type) {
 365                                 ERR("Multiple event type not supported.");
 366                                 ret = CMD_ERROR;
 367                                 goto end;
 368                         }
 369                 }
 370         }
 371
 372         ret = print_missing_or_multiple_domains(
 373                 opt_kernel + opt_userspace + opt_jul + opt_log4j + opt_python, true);
 374         if (ret) {
 375                 ret = CMD_ERROR;
 376                 goto end;
 377         }
 378
 379         /* Ust and agent only support ALL event type */
 380         if ((opt_userspace || opt_jul || opt_log4j || opt_python) &&
 381             opt_event_type != LTTNG_EVENT_ALL) {
 382                 ERR("Disabling userspace and agent (-j | -l | -p) event(s) based on instrumentation type is not supported.\n");
 383                 ret = CMD_ERROR;
 384                 goto end;
 385         }
 386
 387         arg_event_list = poptGetArg(pc);
 388         if (arg_event_list == nullptr && opt_disable_all == 0) {
 389                 ERR("Missing event name(s).\n");
 390                 ret = CMD_ERROR;
 391                 goto end;
 392         }
 393
 394         if (opt_disable_all == 0) {
 395                 event_list = strdup(arg_event_list);
 396                 if (event_list == nullptr) {
 397                         PERROR("Failed to copy event name(s)");
 398                         ret = CMD_ERROR;
 399                         goto end;
 400                 }
 401         }
 402
 403         leftover = poptGetArg(pc);
 404         if (leftover) {
 405                 ERR("Unknown argument: %s", leftover);
 406                 ret = CMD_ERROR;
 407                 goto end;
 408         }
 409
 410         if (!opt_session_name) {
 411                 session_name = get_session_name();
 412                 if (session_name == nullptr) {
 413                         ret = CMD_ERROR;
 414                         goto end;
 415                 }
 416         } else {
 417                 session_name = opt_session_name;
 418         }
 419
 420         /* Mi check */
 421         if (lttng_opt_mi) {
 422                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 423                 if (!writer) {
 424                         ret = -LTTNG_ERR_NOMEM;
 425                         goto end;
 426                 }
 427
 428                 /* Open command element */
 429                 ret = mi_lttng_writer_command_open(writer, mi_lttng_element_command_disable_event);
 430                 if (ret) {
 431                         ret = CMD_ERROR;
 432                         goto end;
 433                 }
 434
 435                 /* Open output element */
 436                 ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command_output);
 437                 if (ret) {
 438                         ret = CMD_ERROR;
 439                         goto end;
 440                 }
 441         }
 442
 443         command_ret = disable_events(session_name, event_list);
 444         if (command_ret) {
 445                 success = 0;
 446         }
 447
 448         /* Mi closing */
 449         if (lttng_opt_mi) {
 450                 /* Close  output element */
 451                 ret = mi_lttng_writer_close_element(writer);
 452                 if (ret) {
 453                         ret = CMD_ERROR;
 454                         goto end;
 455                 }
 456
 457                 ret = mi_lttng_writer_write_element_bool(
 458                         writer, mi_lttng_element_command_success, success);
 459                 if (ret) {
 460                         ret = CMD_ERROR;
 461                         goto end;
 462                 }
 463
 464                 /* Command element close */
 465                 ret = mi_lttng_writer_command_close(writer);
 466                 if (ret) {
 467                         ret = CMD_ERROR;
 468                         goto end;
 469                 }
 470         }
 471
 472 end:
 473         if (!opt_session_name && session_name) {
 474                 free(session_name);
 475         }
 476
 477         free(event_list);
 478
 479         /* Mi clean-up */
 480         if (writer && mi_lttng_writer_destroy(writer)) {
 481                 /* Preserve original error code */
 482                 ret = ret ? ret : LTTNG_ERR_MI_IO_FAIL;
 483         }
 484
 485         /* Overwrite ret if an error occurred in disable_events */
 486         ret = command_ret ? command_ret : ret;
 487
 488         poptFreeContext(pc);
 489         return ret;
 490 }