| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <popt.h> |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/stat.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <unistd.h> |
| 26 | |
| 27 | #include "../command.h" |
| 28 | |
| 29 | static char *opt_session_name; |
| 30 | static char *opt_viewer; |
| 31 | static char *opt_trace_path; |
| 32 | static const char *babeltrace_bin = CONFIG_BABELTRACE_BIN; |
| 33 | //static const char *lttv_gui_bin = CONFIG_LTTV_GUI_BIN; |
| 34 | |
| 35 | #ifdef LTTNG_EMBED_HELP |
| 36 | static const char help_msg[] = |
| 37 | #include <lttng-view.1.h> |
| 38 | ; |
| 39 | #endif |
| 40 | |
| 41 | enum { |
| 42 | OPT_HELP = 1, |
| 43 | OPT_LIST_OPTIONS, |
| 44 | }; |
| 45 | |
| 46 | static struct poptOption long_options[] = { |
| 47 | /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */ |
| 48 | {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0}, |
| 49 | {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL}, |
| 50 | {"viewer", 'e', POPT_ARG_STRING, &opt_viewer, 0, 0, 0}, |
| 51 | {"trace-path", 't', POPT_ARG_STRING, &opt_trace_path, 0, 0, 0}, |
| 52 | {0, 0, 0, 0, 0, 0, 0} |
| 53 | }; |
| 54 | |
| 55 | /* |
| 56 | * This is needed for each viewer since we are using execvp(). |
| 57 | */ |
| 58 | static const char *babeltrace_opts[] = { "babeltrace" }; |
| 59 | //static const char *lttv_gui_opts[] = { "lttv-gui", "-t", }; |
| 60 | |
| 61 | /* |
| 62 | * Type is also use as the index in the viewers array. So please, make sure |
| 63 | * your enum value is in the right order in the array below. |
| 64 | */ |
| 65 | enum viewer_type { |
| 66 | VIEWER_BABELTRACE = 0, |
| 67 | VIEWER_LTTV_GUI = 1, |
| 68 | VIEWER_USER_DEFINED = 2, |
| 69 | }; |
| 70 | |
| 71 | /* |
| 72 | * NOTE: "lttv" is a shell command and it's not working for exec() family |
| 73 | * functions so we might think of removing this wrapper or using bash. |
| 74 | */ |
| 75 | static struct viewers { |
| 76 | const char *exec_name; |
| 77 | enum viewer_type type; |
| 78 | } viewers[] = { |
| 79 | { "babeltrace", VIEWER_BABELTRACE }, |
| 80 | { "lttv-gui", VIEWER_LTTV_GUI }, |
| 81 | { NULL, VIEWER_USER_DEFINED }, |
| 82 | }; |
| 83 | |
| 84 | /* Is the session we are trying to view is in live mode. */ |
| 85 | static int session_live_mode; |
| 86 | |
| 87 | static struct viewers *parse_options(void) |
| 88 | { |
| 89 | if (opt_viewer == NULL) { |
| 90 | /* Default is babeltrace */ |
| 91 | return &(viewers[VIEWER_BABELTRACE]); |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * This means that if -e, --viewers is used, we just override everything |
| 96 | * with it. For supported viewers like lttv, we could simply detect if "-t" |
| 97 | * is passed and if not, add the trace directory to it. |
| 98 | */ |
| 99 | return &(viewers[VIEWER_USER_DEFINED]); |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Alloc an array of string pointer from a simple string having all options |
| 104 | * seperated by spaces. Also adds the trace path to the arguments. |
| 105 | * |
| 106 | * The returning pointer is ready to be passed to execvp(). |
| 107 | */ |
| 108 | static char **alloc_argv_from_user_opts(char *opts, const char *trace_path) |
| 109 | { |
| 110 | int i = 0, ignore_space = 0; |
| 111 | unsigned int num_opts = 1; |
| 112 | char **argv, *token = opts; |
| 113 | |
| 114 | /* Count number of arguments. */ |
| 115 | do { |
| 116 | if (*token == ' ') { |
| 117 | /* Use to ignore consecutive spaces */ |
| 118 | if (!ignore_space) { |
| 119 | num_opts++; |
| 120 | } |
| 121 | ignore_space = 1; |
| 122 | } else { |
| 123 | ignore_space = 0; |
| 124 | } |
| 125 | token++; |
| 126 | } while (*token != '\0'); |
| 127 | |
| 128 | /* Add two here for the NULL terminating element and trace path */ |
| 129 | argv = zmalloc(sizeof(char *) * (num_opts + 2)); |
| 130 | if (argv == NULL) { |
| 131 | goto error; |
| 132 | } |
| 133 | |
| 134 | token = strtok(opts, " "); |
| 135 | while (token != NULL) { |
| 136 | argv[i] = strdup(token); |
| 137 | if (argv[i] == NULL) { |
| 138 | goto error; |
| 139 | } |
| 140 | token = strtok(NULL, " "); |
| 141 | i++; |
| 142 | } |
| 143 | |
| 144 | argv[num_opts] = (char *) trace_path; |
| 145 | argv[num_opts + 1] = NULL; |
| 146 | |
| 147 | return argv; |
| 148 | |
| 149 | error: |
| 150 | if (argv) { |
| 151 | for (i = 0; i < num_opts + 2; i++) { |
| 152 | free(argv[i]); |
| 153 | } |
| 154 | free(argv); |
| 155 | } |
| 156 | |
| 157 | return NULL; |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * Alloc an array of string pointer from an array of strings. It also adds |
| 162 | * the trace path to the argv. |
| 163 | * |
| 164 | * The returning pointer is ready to be passed to execvp(). |
| 165 | */ |
| 166 | static char **alloc_argv_from_local_opts(const char **opts, size_t opts_len, |
| 167 | const char *trace_path) |
| 168 | { |
| 169 | char **argv; |
| 170 | size_t size, mem_len; |
| 171 | |
| 172 | |
| 173 | /* Add one for the NULL terminating element. */ |
| 174 | mem_len = opts_len + 1; |
| 175 | if (session_live_mode) { |
| 176 | /* Add 3 option for the live mode being "-i lttng-live URL". */ |
| 177 | mem_len += 3; |
| 178 | } else { |
| 179 | /* Add option for the trace path. */ |
| 180 | mem_len += 1; |
| 181 | } |
| 182 | |
| 183 | size = sizeof(char *) * mem_len; |
| 184 | |
| 185 | /* Add two here for the trace_path and the NULL terminating element. */ |
| 186 | argv = zmalloc(size); |
| 187 | if (argv == NULL) { |
| 188 | goto error; |
| 189 | } |
| 190 | |
| 191 | memcpy(argv, opts, sizeof(char *) * opts_len); |
| 192 | |
| 193 | if (session_live_mode) { |
| 194 | argv[opts_len] = "-i"; |
| 195 | argv[opts_len + 1] = "lttng-live"; |
| 196 | argv[opts_len + 2] = (char *) trace_path; |
| 197 | argv[opts_len + 3] = NULL; |
| 198 | } else { |
| 199 | argv[opts_len] = (char *) trace_path; |
| 200 | argv[opts_len + 1] = NULL; |
| 201 | } |
| 202 | |
| 203 | error: |
| 204 | return argv; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Spawn viewer with the trace directory path. |
| 209 | */ |
| 210 | static int spawn_viewer(const char *trace_path) |
| 211 | { |
| 212 | int ret = 0; |
| 213 | struct stat status; |
| 214 | const char *viewer_bin = NULL; |
| 215 | struct viewers *viewer; |
| 216 | char **argv = NULL; |
| 217 | |
| 218 | /* Check for --viewer options */ |
| 219 | viewer = parse_options(); |
| 220 | if (viewer == NULL) { |
| 221 | ret = CMD_ERROR; |
| 222 | goto error; |
| 223 | } |
| 224 | |
| 225 | switch (viewer->type) { |
| 226 | case VIEWER_BABELTRACE: |
| 227 | if (stat(babeltrace_bin, &status) == 0) { |
| 228 | viewer_bin = babeltrace_bin; |
| 229 | } else { |
| 230 | viewer_bin = viewer->exec_name; |
| 231 | } |
| 232 | argv = alloc_argv_from_local_opts(babeltrace_opts, |
| 233 | ARRAY_SIZE(babeltrace_opts), trace_path); |
| 234 | break; |
| 235 | case VIEWER_USER_DEFINED: |
| 236 | argv = alloc_argv_from_user_opts(opt_viewer, trace_path); |
| 237 | if (argv) { |
| 238 | viewer_bin = argv[0]; |
| 239 | } |
| 240 | break; |
| 241 | default: |
| 242 | viewer_bin = viewers[VIEWER_BABELTRACE].exec_name; |
| 243 | argv = alloc_argv_from_local_opts(babeltrace_opts, |
| 244 | ARRAY_SIZE(babeltrace_opts), trace_path); |
| 245 | break; |
| 246 | } |
| 247 | |
| 248 | if (argv == NULL || !viewer_bin) { |
| 249 | ret = CMD_FATAL; |
| 250 | goto error; |
| 251 | } |
| 252 | |
| 253 | DBG("Using %s viewer", viewer_bin); |
| 254 | |
| 255 | ret = execvp(viewer_bin, argv); |
| 256 | if (ret) { |
| 257 | if (errno == ENOENT) { |
| 258 | ERR("%s not found on the system", viewer_bin); |
| 259 | } else { |
| 260 | PERROR("exec: %s", viewer_bin); |
| 261 | } |
| 262 | ret = CMD_FATAL; |
| 263 | goto error; |
| 264 | } |
| 265 | |
| 266 | error: |
| 267 | free(argv); |
| 268 | return ret; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * Build the live path we need for the lttng live view. |
| 273 | */ |
| 274 | static char *build_live_path(char *session_name) |
| 275 | { |
| 276 | int ret; |
| 277 | char *path = NULL; |
| 278 | char hostname[HOST_NAME_MAX]; |
| 279 | |
| 280 | ret = gethostname(hostname, sizeof(hostname)); |
| 281 | if (ret < 0) { |
| 282 | PERROR("gethostname"); |
| 283 | goto error; |
| 284 | } |
| 285 | |
| 286 | ret = asprintf(&path, "net://localhost/host/%s/%s", hostname, |
| 287 | session_name); |
| 288 | if (ret < 0) { |
| 289 | PERROR("asprintf live path"); |
| 290 | goto error; |
| 291 | } |
| 292 | |
| 293 | error: |
| 294 | return path; |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * Exec viewer if found and use session name path. |
| 299 | */ |
| 300 | static int view_trace(void) |
| 301 | { |
| 302 | int ret; |
| 303 | char *session_name, *trace_path = NULL; |
| 304 | struct lttng_session *sessions = NULL; |
| 305 | bool free_trace_path = false; |
| 306 | |
| 307 | /* |
| 308 | * Safety net. If lttng is suid at some point for *any* useless reasons, |
| 309 | * this prevent any bad execution of binaries. |
| 310 | */ |
| 311 | if (getuid() != 0) { |
| 312 | if (getuid() != geteuid()) { |
| 313 | ERR("UID does not match effective UID."); |
| 314 | ret = CMD_ERROR; |
| 315 | goto error; |
| 316 | } else if (getgid() != getegid()) { |
| 317 | ERR("GID does not match effective GID."); |
| 318 | ret = CMD_ERROR; |
| 319 | goto error; |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | /* User define trace path override the session name */ |
| 324 | if (opt_trace_path) { |
| 325 | session_name = NULL; |
| 326 | } else if(opt_session_name == NULL) { |
| 327 | session_name = get_session_name(); |
| 328 | if (session_name == NULL) { |
| 329 | ret = CMD_ERROR; |
| 330 | goto error; |
| 331 | } |
| 332 | } else { |
| 333 | session_name = opt_session_name; |
| 334 | } |
| 335 | |
| 336 | DBG("Viewing trace for session %s", session_name); |
| 337 | |
| 338 | if (session_name) { |
| 339 | int i, count, found = 0; |
| 340 | |
| 341 | /* Getting all sessions */ |
| 342 | count = lttng_list_sessions(&sessions); |
| 343 | if (count < 0) { |
| 344 | ERR("Unable to list sessions. Session name %s not found.", |
| 345 | session_name); |
| 346 | MSG("Is there a session daemon running?"); |
| 347 | ret = CMD_ERROR; |
| 348 | goto free_error; |
| 349 | } |
| 350 | |
| 351 | /* Find our session listed by the session daemon */ |
| 352 | for (i = 0; i < count; i++) { |
| 353 | if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) { |
| 354 | found = 1; |
| 355 | break; |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | if (!found) { |
| 360 | MSG("Session name %s not found", session_name); |
| 361 | ret = CMD_ERROR; |
| 362 | goto free_sessions; |
| 363 | } |
| 364 | |
| 365 | session_live_mode = sessions[i].live_timer_interval; |
| 366 | |
| 367 | DBG("Session live mode set to %d", session_live_mode); |
| 368 | |
| 369 | if (sessions[i].enabled && !session_live_mode) { |
| 370 | WARN("Session %s is running. Please stop it before reading it.", |
| 371 | session_name); |
| 372 | ret = CMD_ERROR; |
| 373 | goto free_sessions; |
| 374 | } |
| 375 | |
| 376 | /* If the timer interval is set we are in live mode. */ |
| 377 | if (session_live_mode) { |
| 378 | trace_path = build_live_path(session_name); |
| 379 | if (!trace_path) { |
| 380 | ret = CMD_ERROR; |
| 381 | goto free_sessions; |
| 382 | } |
| 383 | free_trace_path = true; |
| 384 | } else { |
| 385 | /* Get file system session path. */ |
| 386 | trace_path = sessions[i].path; |
| 387 | } |
| 388 | } else { |
| 389 | trace_path = opt_trace_path; |
| 390 | } |
| 391 | |
| 392 | MSG("Trace directory: %s\n", trace_path); |
| 393 | |
| 394 | ret = spawn_viewer(trace_path); |
| 395 | if (ret < 0) { |
| 396 | /* Don't set ret so lttng can interpret the sessiond error. */ |
| 397 | goto free_sessions; |
| 398 | } |
| 399 | |
| 400 | free_sessions: |
| 401 | if (session_live_mode && free_trace_path) { |
| 402 | free(trace_path); |
| 403 | } |
| 404 | free(sessions); |
| 405 | free_error: |
| 406 | if (opt_session_name == NULL) { |
| 407 | free(session_name); |
| 408 | } |
| 409 | error: |
| 410 | return ret; |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * The 'view <options>' first level command |
| 415 | */ |
| 416 | int cmd_view(int argc, const char **argv) |
| 417 | { |
| 418 | int opt, ret = CMD_SUCCESS; |
| 419 | static poptContext pc; |
| 420 | const char *leftover = NULL; |
| 421 | |
| 422 | pc = poptGetContext(NULL, argc, argv, long_options, 0); |
| 423 | poptReadDefaultConfig(pc, 0); |
| 424 | |
| 425 | if (lttng_opt_mi) { |
| 426 | WARN("mi does not apply to view command"); |
| 427 | } |
| 428 | |
| 429 | while ((opt = poptGetNextOpt(pc)) != -1) { |
| 430 | switch (opt) { |
| 431 | case OPT_HELP: |
| 432 | SHOW_HELP(); |
| 433 | goto end; |
| 434 | case OPT_LIST_OPTIONS: |
| 435 | list_cmd_options(stdout, long_options); |
| 436 | goto end; |
| 437 | default: |
| 438 | ret = CMD_UNDEFINED; |
| 439 | goto end; |
| 440 | } |
| 441 | } |
| 442 | |
| 443 | opt_session_name = (char*) poptGetArg(pc); |
| 444 | |
| 445 | leftover = poptGetArg(pc); |
| 446 | if (leftover) { |
| 447 | ERR("Unknown argument: %s", leftover); |
| 448 | ret = CMD_ERROR; |
| 449 | goto end; |
| 450 | } |
| 451 | |
| 452 | ret = view_trace(); |
| 453 | |
| 454 | end: |
| 455 | poptFreeContext(pc); |
| 456 | return ret; |
| 457 | } |