Fix: Invalid free on session_name when destroying session
[lttng-tools.git] / src / bin / lttng / commands / destroy.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
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 _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
29 #include <common/sessiond-comm/sessiond-comm.h>
30
31 static char *opt_session_name;
32 static int opt_destroy_all;
33
34 enum {
35 OPT_HELP = 1,
36 OPT_LIST_OPTIONS,
37 };
38
39 static struct poptOption long_options[] = {
40 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
41 {"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
42 {"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
43 {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
44 {0, 0, 0, 0, 0, 0, 0}
45 };
46
47 /*
48 * usage
49 */
50 static void usage(FILE *ofp)
51 {
52 fprintf(ofp, "usage: lttng destroy [options] [NAME]\n");
53 fprintf(ofp, "\n");
54 fprintf(ofp, "Where NAME is an optional session name. If not specified, lttng will\n");
55 fprintf(ofp, "get it from the configuration directory (.lttng).\n");
56 fprintf(ofp, "\n");
57 fprintf(ofp, " -h, --help Show this help\n");
58 fprintf(ofp, " -a, --all Destroy all sessions\n");
59 fprintf(ofp, " --list-options Simple listing of options\n");
60 fprintf(ofp, "\n");
61 }
62
63 /*
64 * destroy_session
65 *
66 * Unregister the provided session to the session daemon. On success, removes
67 * the default configuration.
68 */
69 static int destroy_session(const char *session_name)
70 {
71 int ret;
72
73 ret = lttng_destroy_session(session_name);
74 if (ret < 0) {
75 switch (-ret) {
76 case LTTCOMM_SESS_NOT_FOUND:
77 WARN("Session name %s not found", session_name);
78 break;
79 default:
80 break;
81 }
82 goto error;
83 }
84
85 MSG("Session %s destroyed", session_name);
86 config_destroy_default();
87 ret = CMD_SUCCESS;
88 error:
89 return ret;
90 }
91
92 /*
93 * destroy_all_sessions
94 *
95 * Call destroy_sessions for each registered sessions
96 */
97 static int destroy_all_sessions()
98 {
99 int count, i, ret = CMD_SUCCESS;
100 struct lttng_session *sessions;
101
102 count = lttng_list_sessions(&sessions);
103 if (count == 0) {
104 MSG("No session found, nothing to do.");
105 }
106 for (i = 0; i < count; i++) {
107 ret = destroy_session(sessions[i].name);
108 if (ret < 0) {
109 goto error;
110 }
111 }
112 error:
113 return ret;
114 }
115
116 /*
117 * get_default_session_name
118 *
119 * Returns the default sessions name, if any
120 */
121 static int get_default_session_name(char **name)
122 {
123 char *session_name = get_session_name();
124 if (session_name == NULL) {
125 return CMD_ERROR;
126 }
127 *name = session_name;
128 return CMD_SUCCESS;
129 }
130
131 /*
132 * The 'destroy <options>' first level command
133 */
134 int cmd_destroy(int argc, const char **argv)
135 {
136 int opt;
137 int ret = CMD_SUCCESS;
138 static poptContext pc;
139 char *session_name = NULL;
140
141 pc = poptGetContext(NULL, argc, argv, long_options, 0);
142 poptReadDefaultConfig(pc, 0);
143
144 while ((opt = poptGetNextOpt(pc)) != -1) {
145 switch (opt) {
146 case OPT_HELP:
147 usage(stdout);
148 break;
149 case OPT_LIST_OPTIONS:
150 list_cmd_options(stdout, long_options);
151 break;
152 default:
153 usage(stderr);
154 ret = CMD_UNDEFINED;
155 break;
156 }
157 goto end;
158 }
159
160 /* Ignore session name in case all sessions are to be destroyed */
161 if (opt_destroy_all) {
162 ret = destroy_all_sessions();
163 goto end;
164 }
165
166 opt_session_name = (char *) poptGetArg(pc);
167
168 if (opt_session_name == NULL) {
169 /* No session name specified, lookup default */
170 session_name = get_session_name();
171 if (session_name == NULL) {
172 ret = CMD_ERROR;
173 goto end;
174 }
175 } else {
176 session_name = opt_session_name;
177 }
178
179 ret = destroy_session(session_name);
180
181 end:
182 if (opt_session_name == NULL) {
183 free(session_name);
184 }
185
186 poptFreeContext(pc);
187 return ret;
188 }
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