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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/rotate-session-internal.h> | |
23 | #include <lttng/action/rotate-session.h> | |
24 | ||
25 | struct lttng_action_rotate_session { | |
26 | struct lttng_action parent; | |
27 | ||
28 | /* Owned by this. */ | |
29 | char *session_name; | |
30 | }; | |
31 | ||
32 | struct lttng_action_rotate_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_rotate_session *action_rotate_session_from_action( | |
45 | struct lttng_action *action) | |
46 | { | |
47 | assert(action); | |
48 | ||
49 | return container_of(action, struct lttng_action_rotate_session, parent); | |
50 | } | |
51 | ||
52 | static const struct lttng_action_rotate_session *action_rotate_session_from_action_const( | |
53 | const struct lttng_action *action) | |
54 | { | |
55 | assert(action); | |
56 | ||
57 | return container_of(action, struct lttng_action_rotate_session, parent); | |
58 | } | |
59 | ||
60 | static bool lttng_action_rotate_session_validate(struct lttng_action *action) | |
61 | { | |
62 | bool valid; | |
63 | struct lttng_action_rotate_session *action_rotate_session; | |
64 | ||
65 | if (!action) { | |
66 | valid = false; | |
67 | goto end; | |
68 | } | |
69 | ||
70 | action_rotate_session = action_rotate_session_from_action(action); | |
71 | ||
72 | /* A non-empty session name is mandatory. */ | |
73 | if (!action_rotate_session->session_name || | |
74 | strlen(action_rotate_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_rotate_session_is_equal(const struct lttng_action *_a, const struct lttng_action *_b) | |
85 | { | |
86 | bool is_equal = false; | |
87 | const struct lttng_action_rotate_session *a, *b; | |
88 | ||
89 | a = action_rotate_session_from_action_const(_a); | |
90 | b = action_rotate_session_from_action_const(_b); | |
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 | static int lttng_action_rotate_session_serialize( | |
104 | struct lttng_action *action, struct lttng_dynamic_buffer *buf) | |
105 | { | |
106 | struct lttng_action_rotate_session *action_rotate_session; | |
107 | struct lttng_action_rotate_session_comm comm; | |
108 | size_t session_name_len; | |
109 | int ret; | |
110 | ||
111 | assert(action); | |
112 | assert(buf); | |
113 | ||
114 | action_rotate_session = action_rotate_session_from_action(action); | |
115 | ||
116 | assert(action_rotate_session->session_name); | |
117 | ||
118 | DBG("Serializing rotate session action: session-name: %s", | |
119 | action_rotate_session->session_name); | |
120 | ||
121 | session_name_len = strlen(action_rotate_session->session_name) + 1; | |
122 | comm.session_name_len = session_name_len; | |
123 | ||
124 | ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm)); | |
125 | if (ret) { | |
126 | ret = -1; | |
127 | goto end; | |
128 | } | |
129 | ||
130 | ret = lttng_dynamic_buffer_append(buf, | |
131 | action_rotate_session->session_name, session_name_len); | |
132 | if (ret) { | |
133 | ret = -1; | |
134 | goto end; | |
135 | } | |
136 | ||
137 | ret = 0; | |
138 | end: | |
139 | return ret; | |
140 | } | |
141 | ||
142 | static void lttng_action_rotate_session_destroy(struct lttng_action *action) | |
143 | { | |
144 | struct lttng_action_rotate_session *action_rotate_session; | |
145 | ||
146 | if (!action) { | |
147 | goto end; | |
148 | } | |
149 | ||
150 | action_rotate_session = action_rotate_session_from_action(action); | |
151 | ||
152 | free(action_rotate_session->session_name); | |
153 | free(action_rotate_session); | |
154 | ||
155 | end: | |
156 | return; | |
157 | } | |
158 | ||
159 | ssize_t lttng_action_rotate_session_create_from_buffer( | |
160 | const struct lttng_buffer_view *view, | |
161 | struct lttng_action **p_action) | |
162 | { | |
163 | ssize_t consumed_len; | |
164 | struct lttng_action_rotate_session_comm *comm; | |
165 | const char *session_name; | |
166 | struct lttng_action *action; | |
167 | enum lttng_action_status status; | |
168 | ||
169 | action = lttng_action_rotate_session_create(); | |
170 | if (!action) { | |
171 | consumed_len = -1; | |
172 | goto end; | |
173 | } | |
174 | ||
175 | comm = (struct lttng_action_rotate_session_comm *) view->data; | |
176 | session_name = (const char *) &comm->data; | |
177 | ||
178 | if (!lttng_buffer_view_validate_string( | |
179 | view, session_name, comm->session_name_len)) { | |
180 | consumed_len = -1; | |
181 | goto end; | |
182 | } | |
183 | ||
184 | status = lttng_action_rotate_session_set_session_name( | |
185 | action, session_name); | |
186 | if (status != LTTNG_ACTION_STATUS_OK) { | |
187 | consumed_len = -1; | |
188 | goto end; | |
189 | } | |
190 | ||
191 | consumed_len = sizeof(struct lttng_action_rotate_session_comm) + | |
192 | comm->session_name_len; | |
193 | *p_action = action; | |
194 | action = NULL; | |
195 | ||
196 | end: | |
197 | lttng_action_rotate_session_destroy(action); | |
198 | ||
199 | return consumed_len; | |
200 | } | |
201 | ||
202 | struct lttng_action *lttng_action_rotate_session_create(void) | |
203 | { | |
204 | struct lttng_action *action; | |
205 | ||
206 | action = zmalloc(sizeof(struct lttng_action_rotate_session)); | |
207 | if (!action) { | |
208 | goto end; | |
209 | } | |
210 | ||
211 | lttng_action_init(action, LTTNG_ACTION_TYPE_ROTATE_SESSION, | |
212 | lttng_action_rotate_session_validate, | |
213 | lttng_action_rotate_session_serialize, | |
214 | lttng_action_rotate_session_is_equal, | |
215 | lttng_action_rotate_session_destroy); | |
216 | ||
217 | end: | |
218 | return action; | |
219 | } | |
220 | ||
221 | enum lttng_action_status lttng_action_rotate_session_set_session_name( | |
222 | struct lttng_action *action, const char *session_name) | |
223 | { | |
224 | struct lttng_action_rotate_session *action_rotate_session; | |
225 | enum lttng_action_status status; | |
226 | ||
227 | if (!action || !session_name || strlen(session_name) == 0) { | |
228 | status = LTTNG_ACTION_STATUS_INVALID; | |
229 | goto end; | |
230 | } | |
231 | ||
232 | action_rotate_session = action_rotate_session_from_action(action); | |
233 | ||
234 | free(action_rotate_session->session_name); | |
235 | ||
236 | action_rotate_session->session_name = strdup(session_name); | |
237 | if (!action_rotate_session->session_name) { | |
238 | status = LTTNG_ACTION_STATUS_ERROR; | |
239 | goto end; | |
240 | } | |
241 | ||
242 | status = LTTNG_ACTION_STATUS_OK; | |
243 | end: | |
244 | return status; | |
245 | } | |
246 | ||
247 | enum lttng_action_status lttng_action_rotate_session_get_session_name( | |
248 | const struct lttng_action *action, const char **session_name) | |
249 | { | |
250 | const struct lttng_action_rotate_session *action_rotate_session; | |
251 | enum lttng_action_status status; | |
252 | ||
253 | if (!action || !session_name) { | |
254 | status = LTTNG_ACTION_STATUS_INVALID; | |
255 | goto end; | |
256 | } | |
257 | ||
258 | action_rotate_session = action_rotate_session_from_action_const(action); | |
259 | ||
260 | *session_name = action_rotate_session->session_name; | |
261 | ||
262 | status = LTTNG_ACTION_STATUS_OK; | |
263 | end: | |
264 | return status; | |
265 | } |