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931bdbaa SM |
1 | /* |
2 | * Copyright (C) 2019 Simon Marchi <simon.marchi@efficios.com> | |
3 | * | |
4 | * SPDX-License-Identifier: LGPL-2.1-only | |
5 | * | |
6 | */ | |
7 | ||
8 | #include <assert.h> | |
9 | #include <common/error.h> | |
10 | #include <common/macros.h> | |
11 | #include <lttng/action/action-internal.h> | |
12 | #include <lttng/action/stop-session-internal.h> | |
13 | #include <lttng/action/stop-session.h> | |
14 | ||
15 | #define IS_STOP_SESSION_ACTION(action) \ | |
16 | (lttng_action_get_type_const(action) == LTTNG_ACTION_TYPE_STOP_SESSION) | |
17 | ||
18 | struct lttng_action_stop_session { | |
19 | struct lttng_action parent; | |
20 | ||
21 | /* Owned by this. */ | |
22 | char *session_name; | |
23 | }; | |
24 | ||
25 | struct lttng_action_stop_session_comm { | |
26 | /* Includes the trailing \0. */ | |
27 | uint32_t session_name_len; | |
28 | ||
29 | /* | |
30 | * Variable data: | |
31 | * | |
32 | * - session name (null terminated) | |
33 | */ | |
34 | char data[]; | |
35 | } LTTNG_PACKED; | |
36 | ||
37 | static struct lttng_action_stop_session *action_stop_session_from_action( | |
38 | struct lttng_action *action) | |
39 | { | |
40 | assert(action); | |
41 | ||
42 | return container_of(action, struct lttng_action_stop_session, parent); | |
43 | } | |
44 | ||
45 | static const struct lttng_action_stop_session * | |
46 | action_stop_session_from_action_const(const struct lttng_action *action) | |
47 | { | |
48 | assert(action); | |
49 | ||
50 | return container_of(action, struct lttng_action_stop_session, parent); | |
51 | } | |
52 | ||
53 | static bool lttng_action_stop_session_validate(struct lttng_action *action) | |
54 | { | |
55 | bool valid; | |
56 | struct lttng_action_stop_session *action_stop_session; | |
57 | ||
58 | if (!action) { | |
59 | valid = false; | |
60 | goto end; | |
61 | } | |
62 | ||
63 | action_stop_session = action_stop_session_from_action(action); | |
64 | ||
65 | /* A non-empty session name is mandatory. */ | |
66 | if (!action_stop_session->session_name || | |
67 | strlen(action_stop_session->session_name) == 0) { | |
68 | valid = false; | |
69 | goto end; | |
70 | } | |
71 | ||
72 | valid = true; | |
73 | end: | |
74 | return valid; | |
75 | } | |
76 | ||
77 | static bool lttng_action_stop_session_is_equal( | |
78 | const struct lttng_action *_a, const struct lttng_action *_b) | |
79 | { | |
80 | bool is_equal = false; | |
81 | const struct lttng_action_stop_session *a, *b; | |
82 | ||
83 | a = action_stop_session_from_action_const(_a); | |
84 | b = action_stop_session_from_action_const(_b); | |
85 | ||
86 | /* Action is not valid if this is not true. */ | |
87 | assert(a->session_name); | |
88 | assert(b->session_name); | |
89 | if (strcmp(a->session_name, b->session_name)) { | |
90 | goto end; | |
91 | } | |
92 | ||
93 | is_equal = true; | |
94 | end: | |
95 | return is_equal; | |
96 | } | |
97 | ||
98 | static int lttng_action_stop_session_serialize( | |
c0a66c84 | 99 | struct lttng_action *action, struct lttng_payload *payload) |
931bdbaa SM |
100 | { |
101 | struct lttng_action_stop_session *action_stop_session; | |
102 | struct lttng_action_stop_session_comm comm; | |
103 | size_t session_name_len; | |
104 | int ret; | |
105 | ||
106 | assert(action); | |
c0a66c84 | 107 | assert(payload); |
931bdbaa SM |
108 | |
109 | action_stop_session = action_stop_session_from_action(action); | |
110 | ||
111 | assert(action_stop_session->session_name); | |
112 | ||
113 | DBG("Serializing stop session action: session-name: %s", | |
114 | action_stop_session->session_name); | |
115 | ||
116 | session_name_len = strlen(action_stop_session->session_name) + 1; | |
117 | comm.session_name_len = session_name_len; | |
118 | ||
c0a66c84 JG |
119 | ret = lttng_dynamic_buffer_append( |
120 | &payload->buffer, &comm, sizeof(comm)); | |
931bdbaa SM |
121 | if (ret) { |
122 | ret = -1; | |
123 | goto end; | |
124 | } | |
125 | ||
c0a66c84 | 126 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
931bdbaa SM |
127 | action_stop_session->session_name, session_name_len); |
128 | if (ret) { | |
129 | ret = -1; | |
130 | goto end; | |
131 | } | |
132 | ||
133 | ret = 0; | |
134 | end: | |
135 | return ret; | |
136 | } | |
137 | ||
138 | static void lttng_action_stop_session_destroy(struct lttng_action *action) | |
139 | { | |
140 | struct lttng_action_stop_session *action_stop_session; | |
141 | ||
142 | if (!action) { | |
143 | goto end; | |
144 | } | |
145 | ||
146 | action_stop_session = action_stop_session_from_action(action); | |
147 | ||
148 | free(action_stop_session->session_name); | |
149 | free(action_stop_session); | |
150 | ||
151 | end: | |
152 | return; | |
153 | } | |
154 | ||
c0a66c84 JG |
155 | ssize_t lttng_action_stop_session_create_from_payload( |
156 | struct lttng_payload_view *view, | |
931bdbaa SM |
157 | struct lttng_action **p_action) |
158 | { | |
159 | ssize_t consumed_len; | |
160 | const struct lttng_action_stop_session_comm *comm; | |
161 | const char *session_name; | |
162 | struct lttng_action *action; | |
163 | enum lttng_action_status status; | |
164 | ||
165 | action = lttng_action_stop_session_create(); | |
166 | if (!action) { | |
167 | consumed_len = -1; | |
168 | goto end; | |
169 | } | |
170 | ||
c0a66c84 | 171 | comm = (typeof(comm)) view->buffer.data; |
931bdbaa SM |
172 | session_name = (const char *) &comm->data; |
173 | ||
174 | if (!lttng_buffer_view_contains_string( | |
c0a66c84 | 175 | &view->buffer, session_name, comm->session_name_len)) { |
931bdbaa SM |
176 | consumed_len = -1; |
177 | goto end; | |
178 | } | |
179 | ||
180 | status = lttng_action_stop_session_set_session_name( | |
181 | action, session_name); | |
182 | if (status != LTTNG_ACTION_STATUS_OK) { | |
183 | consumed_len = -1; | |
184 | goto end; | |
185 | } | |
186 | ||
c0a66c84 | 187 | consumed_len = sizeof(*comm) + comm->session_name_len; |
931bdbaa SM |
188 | *p_action = action; |
189 | action = NULL; | |
190 | ||
191 | end: | |
192 | lttng_action_stop_session_destroy(action); | |
193 | ||
194 | return consumed_len; | |
195 | } | |
196 | ||
197 | struct lttng_action *lttng_action_stop_session_create(void) | |
198 | { | |
199 | struct lttng_action *action; | |
200 | ||
201 | action = zmalloc(sizeof(struct lttng_action_stop_session)); | |
202 | if (!action) { | |
203 | goto end; | |
204 | } | |
205 | ||
206 | lttng_action_init(action, LTTNG_ACTION_TYPE_STOP_SESSION, | |
207 | lttng_action_stop_session_validate, | |
208 | lttng_action_stop_session_serialize, | |
209 | lttng_action_stop_session_is_equal, | |
210 | lttng_action_stop_session_destroy); | |
211 | ||
212 | end: | |
213 | return action; | |
214 | } | |
215 | ||
216 | enum lttng_action_status lttng_action_stop_session_set_session_name( | |
217 | struct lttng_action *action, const char *session_name) | |
218 | { | |
219 | struct lttng_action_stop_session *action_stop_session; | |
220 | enum lttng_action_status status; | |
221 | ||
222 | if (!action || !IS_STOP_SESSION_ACTION(action) || !session_name || | |
223 | strlen(session_name) == 0) { | |
224 | status = LTTNG_ACTION_STATUS_INVALID; | |
225 | goto end; | |
226 | } | |
227 | ||
228 | action_stop_session = action_stop_session_from_action(action); | |
229 | ||
230 | free(action_stop_session->session_name); | |
231 | ||
232 | action_stop_session->session_name = strdup(session_name); | |
233 | if (!action_stop_session->session_name) { | |
234 | status = LTTNG_ACTION_STATUS_ERROR; | |
235 | goto end; | |
236 | } | |
237 | ||
238 | status = LTTNG_ACTION_STATUS_OK; | |
239 | end: | |
240 | return status; | |
241 | } | |
242 | ||
243 | enum lttng_action_status lttng_action_stop_session_get_session_name( | |
244 | const struct lttng_action *action, const char **session_name) | |
245 | { | |
246 | const struct lttng_action_stop_session *action_stop_session; | |
247 | enum lttng_action_status status; | |
248 | ||
249 | if (!action || !IS_STOP_SESSION_ACTION(action) || !session_name) { | |
250 | status = LTTNG_ACTION_STATUS_INVALID; | |
251 | goto end; | |
252 | } | |
253 | ||
254 | action_stop_session = action_stop_session_from_action_const(action); | |
255 | ||
256 | *session_name = action_stop_session->session_name; | |
257 | ||
258 | status = LTTNG_ACTION_STATUS_OK; | |
259 | end: | |
260 | return status; | |
261 | } |