Fix: Warn if session is running with lttng view
[lttng-tools.git] / src / bin / lttng / commands / view.c
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1/*
2 * Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
3 *
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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.
0c95f5b2 7 *
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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.
0c95f5b2 12 *
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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.
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16 */
17
18#define _GNU_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#include <config.h>
29
30static char *opt_session_name;
31static char *opt_viewer;
f1f887c0 32static char *opt_trace_path;
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33static const char *babeltrace_bin = CONFIG_BABELTRACE_BIN;
34//static const char *lttv_gui_bin = CONFIG_LTTV_GUI_BIN;
35
36enum {
37 OPT_HELP = 1,
38 OPT_LIST_OPTIONS,
39};
40
41static struct poptOption long_options[] = {
42 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
43 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
44 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
45 {"viewer", 'e', POPT_ARG_STRING, &opt_viewer, 0, 0, 0},
f1f887c0 46 {"trace-path", 't', POPT_ARG_STRING, &opt_trace_path, 0, 0, 0},
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47 {0, 0, 0, 0, 0, 0, 0}
48};
49
50/*
51 * This is needed for each viewer since we are using execvp().
52 */
36ef520f 53static const char *babeltrace_opts[] = { "babeltrace" };
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54//static const char *lttv_gui_opts[] = { "lttv-gui", "-t", };
55
56/*
57 * Type is also use as the index in the viewers array. So please, make sure
58 * your enum value is in the right order in the array below.
59 */
60enum viewer_type {
61 VIEWER_BABELTRACE = 0,
62 VIEWER_LTTV_GUI = 1,
63 VIEWER_USER_DEFINED = 2,
64};
65
66/*
67 * NOTE: "lttv" is a shell command and it's not working for exec() family
68 * functions so we might think of removing this wrapper or using bash.
69 */
70static struct viewers {
71 const char *exec_name;
72 enum viewer_type type;
73} viewers[] = {
74 { "babeltrace", VIEWER_BABELTRACE },
75 { "lttv-gui", VIEWER_LTTV_GUI },
76 { NULL, VIEWER_USER_DEFINED },
77};
78
79/*
80 * usage
81 */
82static void usage(FILE *ofp)
83{
84 fprintf(ofp, "usage: lttng view [SESSION_NAME] [OPTIONS]\n");
85 fprintf(ofp, "\n");
86 fprintf(ofp, "By default, the babeltrace viewer will be used for text viewing\n");
87 fprintf(ofp, "\n");
88 fprintf(ofp, "Where SESSION_NAME is an optional session name. If not specified, lttng will\n");
89 fprintf(ofp, "get it from the configuration file (.lttngrc).\n");
90 fprintf(ofp, "\n");
32a6298d 91 fprintf(ofp, "Options:\n");
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92 fprintf(ofp, " -h, --help Show this help\n");
93 fprintf(ofp, " --list-options Simple listing of options\n");
f1f887c0 94 fprintf(ofp, " -t, --trace-path PATH Trace directory path for the viewer\n");
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95 fprintf(ofp, " -e, --viewer CMD Specify viewer and/or options to use\n");
96 fprintf(ofp, " This will completely override the default viewers so\n");
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97 fprintf(ofp, " please make sure to specify the full command. The trace\n");
98 fprintf(ofp, " directory path of the session will be appended at the end\n");
99 fprintf(ofp, " to the arguments\n");
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100 fprintf(ofp, "\n");
101}
102
103static struct viewers *parse_options(void)
104{
105 if (opt_viewer == NULL) {
106 /* Default is babeltrace */
107 return &(viewers[VIEWER_BABELTRACE]);
108 }
109
110#if 0
111 if (strstr(opt_viewer, viewers[VIEWER_LTTV_GUI].exec_name) == 0) {
112 return &(viewers[VIEWER_LTTV_GUI]);
113 }
114#endif
115
116 /*
117 * This means that if -e, --viewers is used, we just override everything
118 * with it. For supported viewers like lttv, we could simply detect if "-t"
119 * is passed and if not, add the trace directory to it.
120 */
121 return &(viewers[VIEWER_USER_DEFINED]);
122}
123
124/*
125 * Alloc an array of string pointer from a simple string having all options
126 * seperated by spaces. Also adds the trace path to the arguments.
127 *
128 * The returning pointer is ready to be passed to execvp().
129 */
130static char **alloc_argv_from_user_opts(char *opts, const char *trace_path)
131{
132 int i = 0, ignore_space = 0;
133 unsigned int num_opts = 1;
134 char **argv, *token = opts;
135
136 /* Count number of arguments. */
137 do {
138 if (*token == ' ') {
139 /* Use to ignore consecutive spaces */
140 if (!ignore_space) {
141 num_opts++;
142 }
143 ignore_space = 1;
144 } else {
145 ignore_space = 0;
146 }
147 token++;
148 } while (*token != '\0');
149
150 /* Add two here for the NULL terminating element and trace path */
151 argv = malloc(sizeof(char *) * (num_opts + 2));
152 if (argv == NULL) {
153 goto error;
154 }
155
156 token = strtok(opts, " ");
157 while (token != NULL) {
158 argv[i] = strdup(token);
159 token = strtok(NULL, " ");
160 i++;
161 }
162
163 argv[num_opts] = (char *) trace_path;
164 argv[num_opts + 1] = NULL;
165
166 return argv;
167
168error:
169 return NULL;
170}
171
172/*
173 * Alloc an array of string pointer from an array of strings. It also adds
174 * the trace path to the argv.
175 *
176 * The returning pointer is ready to be passed to execvp().
177 */
178static char **alloc_argv_from_local_opts(const char **opts, size_t opts_len,
179 const char *trace_path)
180{
181 char **argv;
182 size_t size;
183
184 size = sizeof(char *) * opts_len;
185
186 /* Add two here for the trace_path and the NULL terminating element. */
187 argv = malloc(size + 2);
188 if (argv == NULL) {
189 goto error;
190 }
191
192 memcpy(argv, opts, size);
193
194 argv[opts_len] = (char *)trace_path;
195 argv[opts_len + 1] = NULL;
196
197error:
198 return argv;
199}
200
201/*
202 * Spawn viewer with the trace directory path.
203 */
204static int spawn_viewer(const char *trace_path)
205{
206 int ret = 0;
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207 struct stat status;
208 const char *viewer_bin = NULL;
209 struct viewers *viewer;
210 char **argv = NULL;
211
212 /* Check for --viewer options */
213 viewer = parse_options();
214 if (viewer == NULL) {
215 ret = CMD_ERROR;
216 goto error;
217 }
218
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219 switch (viewer->type) {
220 case VIEWER_BABELTRACE:
221 if (stat(babeltrace_bin, &status) == 0) {
222 viewer_bin = babeltrace_bin;
223 } else {
224 viewer_bin = viewer->exec_name;
225 }
226 argv = alloc_argv_from_local_opts(babeltrace_opts,
227 ARRAY_SIZE(babeltrace_opts), trace_path);
228 break;
0c95f5b2 229#if 0
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230 case VIEWER_LTTV_GUI:
231 if (stat(lttv_gui_bin, &status) == 0) {
232 viewer_bin = lttv_gui_bin;
233 } else {
234 viewer_bin = viewer->exec_name;
235 }
236 argv = alloc_argv_from_local_opts(lttv_gui_opts,
237 ARRAY_SIZE(lttv_gui_opts), trace_path);
238 break;
0c95f5b2 239#endif
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240 case VIEWER_USER_DEFINED:
241 argv = alloc_argv_from_user_opts(opt_viewer, trace_path);
242 if (argv) {
243 viewer_bin = argv[0];
0c95f5b2 244 }
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245 break;
246 default:
247 viewer_bin = viewers[VIEWER_BABELTRACE].exec_name;
248 argv = alloc_argv_from_local_opts(babeltrace_opts,
249 ARRAY_SIZE(babeltrace_opts), trace_path);
250 break;
251 }
0c95f5b2 252
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253 if (argv == NULL) {
254 ret = CMD_FATAL;
255 goto error;
256 }
0c95f5b2 257
85a68078 258 DBG("Using %s viewer", viewer_bin);
0c95f5b2 259
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260 ret = execvp(viewer_bin, argv);
261 if (ret) {
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262 if (errno == ENOENT) {
263 ERR("%s not found on the system", viewer_bin);
264 } else {
265 PERROR("exec: %s", viewer_bin);
266 }
85a68078 267 free(argv);
0c95f5b2 268 ret = CMD_FATAL;
85a68078 269 goto error;
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270 }
271
272error:
273 return ret;
274}
275
276/*
277 * Exec viewer if found and use session name path.
278 */
279static int view_trace(void)
280{
281 int ret, count, i, found = 0;
f1f887c0 282 char *session_name, *trace_path;
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283 struct lttng_session *sessions = NULL;
284
285 /*
286 * Safety net. If lttng is suid at some point for *any* useless reasons,
f1f887c0 287 * this prevent any bad execution of binaries.
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288 */
289 if (getuid() != 0) {
290 if (getuid() != geteuid()) {
291 ERR("UID does not match effective UID.");
6e9261f4 292 ret = CMD_ERROR;
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293 goto error;
294 } else if (getgid() != getegid()) {
295 ERR("GID does not match effective GID.");
6e9261f4 296 ret = CMD_ERROR;
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297 goto error;
298 }
299 }
300
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301 /* User define trace path override the session name */
302 if (opt_trace_path) {
303 session_name = NULL;
304 } else if(opt_session_name == NULL) {
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305 session_name = get_session_name();
306 if (session_name == NULL) {
307 ret = CMD_ERROR;
308 goto error;
309 }
310 } else {
311 session_name = opt_session_name;
312 }
313
314 DBG("Viewing trace for session %s", session_name);
315
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316 if (session_name) {
317 /* Getting all sessions */
318 count = lttng_list_sessions(&sessions);
319 if (count < 0) {
320 ERR("Unable to list sessions. Session name %s not found.",
321 session_name);
322 MSG("Is there a session daemon running?");
323 ret = CMD_ERROR;
324 goto free_error;
325 }
0c95f5b2 326
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327 /* Find our session listed by the session daemon */
328 for (i = 0; i < count; i++) {
329 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
330 found = 1;
331 break;
332 }
0c95f5b2 333 }
0c95f5b2 334
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335 if (!found) {
336 MSG("Session name %s not found", session_name);
337 ret = CMD_ERROR;
338 goto free_sessions;
339 }
340
341 trace_path = sessions[i].path;
342 } else {
343 trace_path = opt_trace_path;
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344 }
345
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346 if (sessions[i].enabled) {
347 WARN("Session %s is running. Please stop it before reading it.",
348 session_name);
349 ret = CMD_ERROR;
350 goto free_sessions;
351 }
352
f1f887c0 353 MSG("Trace directory: %s\n", trace_path);
0c95f5b2 354
f1f887c0 355 ret = spawn_viewer(trace_path);
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356 if (ret < 0) {
357 /* Don't set ret so lttng can interpret the sessiond error. */
358 goto free_sessions;
359 }
360
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361free_sessions:
362 if (sessions) {
363 free(sessions);
364 }
365free_error:
366 if (opt_session_name == NULL) {
367 free(session_name);
368 }
369error:
370 return ret;
371}
372
373/*
374 * The 'view <options>' first level command
375 */
376int cmd_view(int argc, const char **argv)
377{
378 int opt, ret = CMD_SUCCESS;
379 static poptContext pc;
380
381 pc = poptGetContext(NULL, argc, argv, long_options, 0);
382 poptReadDefaultConfig(pc, 0);
383
384 while ((opt = poptGetNextOpt(pc)) != -1) {
385 switch (opt) {
386 case OPT_HELP:
387 usage(stdout);
388 goto end;
389 case OPT_LIST_OPTIONS:
390 list_cmd_options(stdout, long_options);
391 goto end;
392 default:
393 usage(stderr);
394 ret = CMD_UNDEFINED;
395 goto end;
396 }
397 }
398
399 opt_session_name = (char*) poptGetArg(pc);
400
401 ret = view_trace();
402
403end:
404 poptFreeContext(pc);
405 return ret;
406}
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