Commit | Line | Data |
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5024c2ac JR |
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/start-session-internal.h> | |
13 | #include <lttng/action/start-session.h> | |
14 | ||
15 | struct lttng_action_start_session { | |
16 | struct lttng_action parent; | |
17 | ||
18 | /* Owned by this. */ | |
19 | char *session_name; | |
20 | }; | |
21 | ||
22 | struct lttng_action_start_session_comm { | |
23 | /* Includes the trailing \0. */ | |
24 | uint32_t session_name_len; | |
25 | ||
26 | /* | |
27 | * Variable data: | |
28 | * | |
29 | * - session name (null terminated) | |
30 | */ | |
31 | char data[]; | |
32 | } LTTNG_PACKED; | |
33 | ||
34 | static struct lttng_action_start_session *action_start_session_from_action( | |
35 | struct lttng_action *action) | |
36 | { | |
37 | assert(action); | |
38 | ||
39 | return container_of(action, struct lttng_action_start_session, parent); | |
40 | } | |
41 | ||
42 | static const struct lttng_action_start_session *action_start_session_from_action_const( | |
43 | const struct lttng_action *action) | |
44 | { | |
45 | assert(action); | |
46 | ||
47 | return container_of(action, struct lttng_action_start_session, parent); | |
48 | } | |
49 | ||
50 | static bool lttng_action_start_session_validate(struct lttng_action *action) | |
51 | { | |
52 | bool valid; | |
53 | struct lttng_action_start_session *action_start_session; | |
54 | ||
55 | if (!action) { | |
56 | valid = false; | |
57 | goto end; | |
58 | } | |
59 | ||
60 | action_start_session = action_start_session_from_action(action); | |
61 | ||
62 | /* A non-empty session name is mandatory. */ | |
63 | if (!action_start_session->session_name || | |
64 | strlen(action_start_session->session_name) == 0) { | |
65 | valid = false; | |
66 | goto end; | |
67 | } | |
68 | ||
69 | valid = true; | |
70 | end: | |
71 | return valid; | |
72 | } | |
73 | ||
74 | static bool lttng_action_start_session_is_equal(const struct lttng_action *_a, const struct lttng_action *_b) | |
75 | { | |
76 | bool is_equal = false; | |
77 | struct lttng_action_start_session *a, *b; | |
78 | ||
79 | a = container_of(_a, struct lttng_action_start_session, parent); | |
80 | b = container_of(_b, struct lttng_action_start_session, parent); | |
81 | ||
82 | /* Action is not valid if this is not true. */ | |
83 | assert(a->session_name); | |
84 | assert(b->session_name); | |
85 | if (strcmp(a->session_name, b->session_name)) { | |
86 | goto end; | |
87 | } | |
88 | ||
89 | is_equal = true; | |
90 | end: | |
91 | return is_equal; | |
92 | } | |
93 | ||
94 | static int lttng_action_start_session_serialize( | |
95 | struct lttng_action *action, struct lttng_dynamic_buffer *buf) | |
96 | { | |
97 | struct lttng_action_start_session *action_start_session; | |
98 | struct lttng_action_start_session_comm comm; | |
99 | size_t session_name_len; | |
100 | int ret; | |
101 | ||
102 | assert(action); | |
103 | assert(buf); | |
104 | ||
105 | action_start_session = action_start_session_from_action(action); | |
106 | ||
107 | assert(action_start_session->session_name); | |
108 | ||
109 | DBG("Serializing start session action: session-name: %s", | |
110 | action_start_session->session_name); | |
111 | ||
112 | session_name_len = strlen(action_start_session->session_name) + 1; | |
113 | comm.session_name_len = session_name_len; | |
114 | ||
115 | ret = lttng_dynamic_buffer_append(buf, &comm, sizeof(comm)); | |
116 | if (ret) { | |
117 | ret = -1; | |
118 | goto end; | |
119 | } | |
120 | ||
121 | ret = lttng_dynamic_buffer_append(buf, | |
122 | action_start_session->session_name, session_name_len); | |
123 | if (ret) { | |
124 | ret = -1; | |
125 | goto end; | |
126 | } | |
127 | ||
128 | ret = 0; | |
129 | end: | |
130 | return ret; | |
131 | } | |
132 | ||
133 | static void lttng_action_start_session_destroy(struct lttng_action *action) | |
134 | { | |
135 | struct lttng_action_start_session *action_start_session; | |
136 | ||
137 | if (!action) { | |
138 | goto end; | |
139 | } | |
140 | ||
141 | action_start_session = action_start_session_from_action(action); | |
142 | ||
143 | free(action_start_session->session_name); | |
144 | free(action_start_session); | |
145 | ||
146 | end: | |
147 | return; | |
148 | } | |
149 | ||
150 | ssize_t lttng_action_start_session_create_from_buffer( | |
151 | const struct lttng_buffer_view *view, | |
152 | struct lttng_action **p_action) | |
153 | { | |
154 | ssize_t consumed_len; | |
155 | struct lttng_action_start_session_comm *comm; | |
156 | const char *session_name; | |
157 | struct lttng_action *action; | |
158 | enum lttng_action_status status; | |
159 | ||
160 | action = lttng_action_start_session_create(); | |
161 | if (!action) { | |
162 | consumed_len = -1; | |
163 | goto end; | |
164 | } | |
165 | ||
166 | comm = (struct lttng_action_start_session_comm *) view->data; | |
167 | session_name = (const char *) &comm->data; | |
168 | ||
169 | if (!lttng_buffer_view_contains_string( | |
170 | view, session_name, comm->session_name_len)) { | |
171 | consumed_len = -1; | |
172 | goto end; | |
173 | } | |
174 | ||
175 | status = lttng_action_start_session_set_session_name( | |
176 | action, session_name); | |
177 | if (status != LTTNG_ACTION_STATUS_OK) { | |
178 | consumed_len = -1; | |
179 | goto end; | |
180 | } | |
181 | ||
182 | consumed_len = sizeof(struct lttng_action_start_session_comm) + | |
183 | comm->session_name_len; | |
184 | *p_action = action; | |
185 | action = NULL; | |
186 | ||
187 | end: | |
188 | lttng_action_start_session_destroy(action); | |
189 | ||
190 | return consumed_len; | |
191 | } | |
192 | ||
193 | struct lttng_action *lttng_action_start_session_create(void) | |
194 | { | |
195 | struct lttng_action *action; | |
196 | ||
197 | action = zmalloc(sizeof(struct lttng_action_start_session)); | |
198 | if (!action) { | |
199 | goto end; | |
200 | } | |
201 | ||
202 | lttng_action_init(action, LTTNG_ACTION_TYPE_START_SESSION, | |
203 | lttng_action_start_session_validate, | |
204 | lttng_action_start_session_serialize, | |
205 | lttng_action_start_session_is_equal, | |
206 | lttng_action_start_session_destroy); | |
207 | ||
208 | end: | |
209 | return action; | |
210 | } | |
211 | ||
212 | enum lttng_action_status lttng_action_start_session_set_session_name( | |
213 | struct lttng_action *action, const char *session_name) | |
214 | { | |
215 | struct lttng_action_start_session *action_start_session; | |
216 | enum lttng_action_status status; | |
217 | ||
218 | if (!action || !session_name || strlen(session_name) == 0) { | |
219 | status = LTTNG_ACTION_STATUS_INVALID; | |
220 | goto end; | |
221 | } | |
222 | ||
223 | action_start_session = action_start_session_from_action(action); | |
224 | ||
225 | free(action_start_session->session_name); | |
226 | ||
227 | action_start_session->session_name = strdup(session_name); | |
228 | if (!action_start_session->session_name) { | |
229 | status = LTTNG_ACTION_STATUS_ERROR; | |
230 | goto end; | |
231 | } | |
232 | ||
233 | status = LTTNG_ACTION_STATUS_OK; | |
234 | end: | |
235 | return status; | |
236 | } | |
237 | ||
238 | enum lttng_action_status lttng_action_start_session_get_session_name( | |
239 | const struct lttng_action *action, const char **session_name) | |
240 | { | |
241 | const struct lttng_action_start_session *action_start_session; | |
242 | enum lttng_action_status status; | |
243 | ||
244 | if (!action || !session_name) { | |
245 | status = LTTNG_ACTION_STATUS_INVALID; | |
246 | goto end; | |
247 | } | |
248 | ||
249 | action_start_session = action_start_session_from_action_const(action); | |
250 | ||
251 | *session_name = action_start_session->session_name; | |
252 | ||
253 | status = LTTNG_ACTION_STATUS_OK; | |
254 | end: | |
255 | return status; | |
256 | } |