| 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/rotate-session-internal.h> |
| 13 | #include <lttng/action/rotate-session.h> |
| 14 | |
| 15 | #define IS_ROTATE_SESSION_ACTION(action) \ |
| 16 | (lttng_action_get_type(action) == LTTNG_ACTION_TYPE_ROTATE_SESSION) |
| 17 | |
| 18 | struct lttng_action_rotate_session { |
| 19 | struct lttng_action parent; |
| 20 | |
| 21 | /* Owned by this. */ |
| 22 | char *session_name; |
| 23 | }; |
| 24 | |
| 25 | struct lttng_action_rotate_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_rotate_session *action_rotate_session_from_action( |
| 38 | struct lttng_action *action) |
| 39 | { |
| 40 | assert(action); |
| 41 | |
| 42 | return container_of(action, struct lttng_action_rotate_session, parent); |
| 43 | } |
| 44 | |
| 45 | static const struct lttng_action_rotate_session * |
| 46 | action_rotate_session_from_action_const(const struct lttng_action *action) |
| 47 | { |
| 48 | assert(action); |
| 49 | |
| 50 | return container_of(action, struct lttng_action_rotate_session, parent); |
| 51 | } |
| 52 | |
| 53 | static bool lttng_action_rotate_session_validate(struct lttng_action *action) |
| 54 | { |
| 55 | bool valid; |
| 56 | struct lttng_action_rotate_session *action_rotate_session; |
| 57 | |
| 58 | if (!action) { |
| 59 | valid = false; |
| 60 | goto end; |
| 61 | } |
| 62 | |
| 63 | action_rotate_session = action_rotate_session_from_action(action); |
| 64 | |
| 65 | /* A non-empty session name is mandatory. */ |
| 66 | if (!action_rotate_session->session_name || |
| 67 | strlen(action_rotate_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_rotate_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_rotate_session *a, *b; |
| 82 | |
| 83 | a = action_rotate_session_from_action_const(_a); |
| 84 | b = action_rotate_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 | static int lttng_action_rotate_session_serialize( |
| 98 | struct lttng_action *action, struct lttng_payload *payload) |
| 99 | { |
| 100 | struct lttng_action_rotate_session *action_rotate_session; |
| 101 | struct lttng_action_rotate_session_comm comm; |
| 102 | size_t session_name_len; |
| 103 | int ret; |
| 104 | |
| 105 | assert(action); |
| 106 | assert(payload); |
| 107 | |
| 108 | action_rotate_session = action_rotate_session_from_action(action); |
| 109 | |
| 110 | assert(action_rotate_session->session_name); |
| 111 | |
| 112 | DBG("Serializing rotate session action: session-name: %s", |
| 113 | action_rotate_session->session_name); |
| 114 | |
| 115 | session_name_len = strlen(action_rotate_session->session_name) + 1; |
| 116 | comm.session_name_len = session_name_len; |
| 117 | |
| 118 | ret = lttng_dynamic_buffer_append( |
| 119 | &payload->buffer, &comm, sizeof(comm)); |
| 120 | if (ret) { |
| 121 | ret = -1; |
| 122 | goto end; |
| 123 | } |
| 124 | |
| 125 | ret = lttng_dynamic_buffer_append(&payload->buffer, |
| 126 | action_rotate_session->session_name, session_name_len); |
| 127 | if (ret) { |
| 128 | ret = -1; |
| 129 | goto end; |
| 130 | } |
| 131 | |
| 132 | ret = 0; |
| 133 | end: |
| 134 | return ret; |
| 135 | } |
| 136 | |
| 137 | static void lttng_action_rotate_session_destroy(struct lttng_action *action) |
| 138 | { |
| 139 | struct lttng_action_rotate_session *action_rotate_session; |
| 140 | |
| 141 | if (!action) { |
| 142 | goto end; |
| 143 | } |
| 144 | |
| 145 | action_rotate_session = action_rotate_session_from_action(action); |
| 146 | |
| 147 | free(action_rotate_session->session_name); |
| 148 | free(action_rotate_session); |
| 149 | |
| 150 | end: |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | ssize_t lttng_action_rotate_session_create_from_payload( |
| 155 | struct lttng_payload_view *view, |
| 156 | struct lttng_action **p_action) |
| 157 | { |
| 158 | ssize_t consumed_len; |
| 159 | const struct lttng_action_rotate_session_comm *comm; |
| 160 | const char *session_name; |
| 161 | struct lttng_action *action; |
| 162 | enum lttng_action_status status; |
| 163 | |
| 164 | action = lttng_action_rotate_session_create(); |
| 165 | if (!action) { |
| 166 | consumed_len = -1; |
| 167 | goto end; |
| 168 | } |
| 169 | |
| 170 | comm = (typeof(comm)) view->buffer.data; |
| 171 | session_name = (const char *) &comm->data; |
| 172 | |
| 173 | if (!lttng_buffer_view_contains_string( |
| 174 | &view->buffer, session_name, comm->session_name_len)) { |
| 175 | consumed_len = -1; |
| 176 | goto end; |
| 177 | } |
| 178 | |
| 179 | status = lttng_action_rotate_session_set_session_name( |
| 180 | action, session_name); |
| 181 | if (status != LTTNG_ACTION_STATUS_OK) { |
| 182 | consumed_len = -1; |
| 183 | goto end; |
| 184 | } |
| 185 | |
| 186 | consumed_len = sizeof(*comm) + comm->session_name_len; |
| 187 | *p_action = action; |
| 188 | action = NULL; |
| 189 | |
| 190 | end: |
| 191 | lttng_action_rotate_session_destroy(action); |
| 192 | |
| 193 | return consumed_len; |
| 194 | } |
| 195 | |
| 196 | struct lttng_action *lttng_action_rotate_session_create(void) |
| 197 | { |
| 198 | struct lttng_action *action; |
| 199 | |
| 200 | action = zmalloc(sizeof(struct lttng_action_rotate_session)); |
| 201 | if (!action) { |
| 202 | goto end; |
| 203 | } |
| 204 | |
| 205 | lttng_action_init(action, LTTNG_ACTION_TYPE_ROTATE_SESSION, |
| 206 | lttng_action_rotate_session_validate, |
| 207 | lttng_action_rotate_session_serialize, |
| 208 | lttng_action_rotate_session_is_equal, |
| 209 | lttng_action_rotate_session_destroy); |
| 210 | |
| 211 | end: |
| 212 | return action; |
| 213 | } |
| 214 | |
| 215 | enum lttng_action_status lttng_action_rotate_session_set_session_name( |
| 216 | struct lttng_action *action, const char *session_name) |
| 217 | { |
| 218 | struct lttng_action_rotate_session *action_rotate_session; |
| 219 | enum lttng_action_status status; |
| 220 | |
| 221 | if (!action || !IS_ROTATE_SESSION_ACTION(action) || !session_name || |
| 222 | strlen(session_name) == 0) { |
| 223 | status = LTTNG_ACTION_STATUS_INVALID; |
| 224 | goto end; |
| 225 | } |
| 226 | |
| 227 | action_rotate_session = action_rotate_session_from_action(action); |
| 228 | |
| 229 | free(action_rotate_session->session_name); |
| 230 | |
| 231 | action_rotate_session->session_name = strdup(session_name); |
| 232 | if (!action_rotate_session->session_name) { |
| 233 | status = LTTNG_ACTION_STATUS_ERROR; |
| 234 | goto end; |
| 235 | } |
| 236 | |
| 237 | status = LTTNG_ACTION_STATUS_OK; |
| 238 | end: |
| 239 | return status; |
| 240 | } |
| 241 | |
| 242 | enum lttng_action_status lttng_action_rotate_session_get_session_name( |
| 243 | const struct lttng_action *action, const char **session_name) |
| 244 | { |
| 245 | const struct lttng_action_rotate_session *action_rotate_session; |
| 246 | enum lttng_action_status status; |
| 247 | |
| 248 | if (!action || !IS_ROTATE_SESSION_ACTION(action) || !session_name) { |
| 249 | status = LTTNG_ACTION_STATUS_INVALID; |
| 250 | goto end; |
| 251 | } |
| 252 | |
| 253 | action_rotate_session = action_rotate_session_from_action_const(action); |
| 254 | |
| 255 | *session_name = action_rotate_session->session_name; |
| 256 | |
| 257 | status = LTTNG_ACTION_STATUS_OK; |
| 258 | end: |
| 259 | return status; |
| 260 | } |