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1 | /* |
2 | * Copyright (C) 2019 EfficiOS, Inc. | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this library; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | #include <assert.h> | |
19 | #include <common/error.h> | |
20 | #include <common/macros.h> | |
21 | #include <lttng/action/action-internal.h> | |
22 | #include <lttng/action/start-session-internal.h> | |
23 | #include <lttng/action/start-session.h> | |
24 | ||
25 | struct lttng_action_start_session { | |
26 | struct lttng_action parent; | |
27 | ||
28 | /* Owned by this. */ | |
29 | char *session_name; | |
30 | }; | |
31 | ||
32 | struct lttng_action_start_session_comm { | |
33 | /* Includes the trailing \0. */ | |
34 | uint32_t session_name_len; | |
35 | ||
36 | /* | |
37 | * Variable data: | |
38 | * | |
39 | * - session name (null terminated) | |
40 | */ | |
41 | char data[]; | |
42 | } LTTNG_PACKED; | |
43 | ||
44 | static struct lttng_action_start_session *action_start_session_from_action( | |
45 | struct lttng_action *action) | |
46 | { | |
47 | assert(action); | |
48 | ||
49 | return container_of(action, struct lttng_action_start_session, parent); | |
50 | } | |
51 | ||
52 | static const struct lttng_action_start_session *action_start_session_from_action_const( | |
53 | const struct lttng_action *action) | |
54 | { | |
55 | assert(action); | |
56 | ||
57 | return container_of(action, struct lttng_action_start_session, parent); | |
58 | } | |
59 | ||
60 | static bool lttng_action_start_session_validate(struct lttng_action *action) | |
61 | { | |
62 | bool valid; | |
63 | struct lttng_action_start_session *action_start_session; | |
64 | ||
65 | if (!action) { | |
66 | valid = false; | |
67 | goto end; | |
68 | } | |
69 | ||
70 | action_start_session = action_start_session_from_action(action); | |
71 | ||
72 | /* A non-empty session name is mandatory. */ | |
73 | if (!action_start_session->session_name || | |
74 | strlen(action_start_session->session_name) == 0) { | |
75 | valid = false; | |
76 | goto end; | |
77 | } | |
78 | ||
79 | valid = true; | |
80 | end: | |
81 | return valid; | |
82 | } | |
83 | ||
84 | static bool lttng_action_start_session_is_equal(const struct lttng_action *_a, const struct lttng_action *_b) | |
85 | { | |
86 | bool is_equal = false; | |
87 | struct lttng_action_start_session *a, *b; | |
88 | ||
89 | a = container_of(_a, struct lttng_action_start_session, parent); | |
90 | b = container_of(_b, struct lttng_action_start_session, parent); | |
91 | ||
92 | /* Action is not valid if this is not true. */ | |
93 | assert(a->session_name); | |
94 | assert(b->session_name); | |
95 | if (strcmp(a->session_name, b->session_name)) { | |
96 | goto end; | |
97 | } | |
98 | ||
99 | is_equal = true; | |
100 | end: | |
101 | return is_equal; | |
102 | } | |
103 | ||
104 | static int lttng_action_start_session_serialize( | |
105 | struct lttng_action *action, struct lttng_dynamic_buffer *buf) | |
106 | { | |
107 | struct lttng_action_start_session *action_start_session; | |
108 | struct lttng_action_start_session_comm comm; | |
109 | size_t session_name_len; | |
110 | int ret; | |
111 | ||
112 | assert(action); | |
113 | assert(buf); | |
114 | ||
115 | action_start_session = action_start_session_from_action(action); | |
116 | ||
117 | assert(action_start_session->session_name); | |
118 | ||
119 | DBG("Serializing start session action: session-name: %s", | |
120 | action_start_session->session_name); | |
121 | ||
122 | session_name_len = strlen(action_start_session->session_name) + 1; | |
123 | comm.session_name_len = session_name_len; | |
124 | ||
125 | ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm)); | |
126 | if (ret) { | |
127 | ret = -1; | |
128 | goto end; | |
129 | } | |
130 | ||
131 | ret = lttng_dynamic_buffer_append(buf, | |
132 | action_start_session->session_name, session_name_len); | |
133 | if (ret) { | |
134 | ret = -1; | |
135 | goto end; | |
136 | } | |
137 | ||
138 | ret = 0; | |
139 | end: | |
140 | return ret; | |
141 | } | |
142 | ||
143 | static void lttng_action_start_session_destroy(struct lttng_action *action) | |
144 | { | |
145 | struct lttng_action_start_session *action_start_session; | |
146 | ||
147 | if (!action) { | |
148 | goto end; | |
149 | } | |
150 | ||
151 | action_start_session = action_start_session_from_action(action); | |
152 | ||
153 | free(action_start_session->session_name); | |
154 | free(action_start_session); | |
155 | ||
156 | end: | |
157 | return; | |
158 | } | |
159 | ||
160 | ssize_t lttng_action_start_session_create_from_buffer( | |
161 | const struct lttng_buffer_view *view, | |
162 | struct lttng_action **p_action) | |
163 | { | |
164 | ssize_t consumed_len; | |
165 | struct lttng_action_start_session_comm *comm; | |
166 | const char *session_name; | |
167 | struct lttng_action *action; | |
168 | enum lttng_action_status status; | |
169 | ||
170 | action = lttng_action_start_session_create(); | |
171 | if (!action) { | |
172 | consumed_len = -1; | |
173 | goto end; | |
174 | } | |
175 | ||
176 | comm = (struct lttng_action_start_session_comm *) view->data; | |
177 | session_name = (const char *) &comm->data; | |
178 | ||
179 | if (!lttng_buffer_view_validate_string( | |
180 | view, session_name, comm->session_name_len)) { | |
181 | consumed_len = -1; | |
182 | goto end; | |
183 | } | |
184 | ||
185 | status = lttng_action_start_session_set_session_name( | |
186 | action, session_name); | |
187 | if (status != LTTNG_ACTION_STATUS_OK) { | |
188 | consumed_len = -1; | |
189 | goto end; | |
190 | } | |
191 | ||
192 | consumed_len = sizeof(struct lttng_action_start_session_comm) + | |
193 | comm->session_name_len; | |
194 | *p_action = action; | |
195 | action = NULL; | |
196 | ||
197 | end: | |
198 | lttng_action_start_session_destroy(action); | |
199 | ||
200 | return consumed_len; | |
201 | } | |
202 | ||
203 | struct lttng_action *lttng_action_start_session_create(void) | |
204 | { | |
205 | struct lttng_action *action; | |
206 | ||
207 | action = zmalloc(sizeof(struct lttng_action_start_session)); | |
208 | if (!action) { | |
209 | goto end; | |
210 | } | |
211 | ||
212 | lttng_action_init(action, LTTNG_ACTION_TYPE_START_SESSION, | |
213 | lttng_action_start_session_validate, | |
214 | lttng_action_start_session_serialize, | |
215 | lttng_action_start_session_is_equal, | |
216 | lttng_action_start_session_destroy); | |
217 | ||
218 | end: | |
219 | return action; | |
220 | } | |
221 | ||
222 | enum lttng_action_status lttng_action_start_session_set_session_name( | |
223 | struct lttng_action *action, const char *session_name) | |
224 | { | |
225 | struct lttng_action_start_session *action_start_session; | |
226 | enum lttng_action_status status; | |
227 | ||
228 | if (!action || !session_name || strlen(session_name) == 0) { | |
229 | status = LTTNG_ACTION_STATUS_INVALID; | |
230 | goto end; | |
231 | } | |
232 | ||
233 | action_start_session = action_start_session_from_action(action); | |
234 | ||
235 | free(action_start_session->session_name); | |
236 | ||
237 | action_start_session->session_name = strdup(session_name); | |
238 | if (!action_start_session->session_name) { | |
239 | status = LTTNG_ACTION_STATUS_ERROR; | |
240 | goto end; | |
241 | } | |
242 | ||
243 | status = LTTNG_ACTION_STATUS_OK; | |
244 | end: | |
245 | return status; | |
246 | } | |
247 | ||
248 | enum lttng_action_status lttng_action_start_session_get_session_name( | |
249 | const struct lttng_action *action, const char **session_name) | |
250 | { | |
251 | const struct lttng_action_start_session *action_start_session; | |
252 | enum lttng_action_status status; | |
253 | ||
254 | if (!action || !session_name) { | |
255 | status = LTTNG_ACTION_STATUS_INVALID; | |
256 | goto end; | |
257 | } | |
258 | ||
259 | action_start_session = action_start_session_from_action_const(action); | |
260 | ||
261 | *session_name = action_start_session->session_name; | |
262 | ||
263 | status = LTTNG_ACTION_STATUS_OK; | |
264 | end: | |
265 | return status; | |
266 | } |