src/common/tracker.c

   1 /*
   2  * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #include <assert.h>
   9 #include <common/defaults.h>
  10 #include <common/error.h>
  11 #include <common/macros.h>
  12 #include <common/sessiond-comm/sessiond-comm.h>
  13 #include <common/uri.h>
  14 #include <lttng/tracker-internal.h>
  15 #include <stdio.h>
  16 #include <time.h>
  17
  18 struct lttng_tracker_id *lttng_tracker_id_create(void)
  19 {
  20         struct lttng_tracker_id *id;
  21
  22         id = zmalloc(sizeof(*id));
  23         if (!id) {
  24                 goto error;
  25         }
  26
  27         id->type = LTTNG_ID_UNKNOWN;
  28         id->string = NULL;
  29         id->value = -1;
  30         return id;
  31 error:
  32         lttng_tracker_id_destroy(id);
  33         return NULL;
  34 }
  35
  36 enum lttng_tracker_id_status lttng_tracker_id_set_value(
  37                 struct lttng_tracker_id *id, int value)
  38 {
  39         assert(id);
  40
  41         if (value < 0) {
  42                 return LTTNG_TRACKER_ID_STATUS_INVALID;
  43         }
  44
  45         id->type = LTTNG_ID_VALUE;
  46         id->value = value;
  47         return LTTNG_TRACKER_ID_STATUS_OK;
  48 }
  49
  50 enum lttng_tracker_id_status lttng_tracker_id_set_string(
  51                 struct lttng_tracker_id *id, const char *value)
  52 {
  53         assert(id);
  54         assert(value);
  55
  56         id->type = LTTNG_ID_STRING;
  57         id->string = strdup(value);
  58         if (id->string == NULL) {
  59                 /* No memory left */
  60                 goto error;
  61         }
  62
  63         return LTTNG_TRACKER_ID_STATUS_OK;
  64 error:
  65         return LTTNG_TRACKER_ID_STATUS_INVALID;
  66 }
  67
  68 enum lttng_tracker_id_status lttng_tracker_id_set_all(
  69                 struct lttng_tracker_id *id)
  70 {
  71         assert(id);
  72
  73         id->type = LTTNG_ID_ALL;
  74
  75         return LTTNG_TRACKER_ID_STATUS_OK;
  76 }
  77
  78 static void lttng_tracker_id_reset(struct lttng_tracker_id *id)
  79 {
  80         if (id == NULL) {
  81                 return;
  82         }
  83
  84         if (id->string != NULL) {
  85                 free(id->string);
  86                 id->string = NULL;
  87         }
  88
  89         id->type = LTTNG_ID_UNKNOWN;
  90         id->value = -1;
  91 }
  92
  93 void lttng_tracker_id_destroy(struct lttng_tracker_id *id)
  94 {
  95         if (id == NULL) {
  96                 return;
  97         }
  98
  99         lttng_tracker_id_reset(id);
 100
 101         free(id);
 102 }
 103
 104 enum lttng_tracker_id_type lttng_tracker_id_get_type(
 105                 const struct lttng_tracker_id *id)
 106 {
 107         assert(id);
 108         return id->type;
 109 }
 110
 111 enum lttng_tracker_id_status lttng_tracker_id_get_value(
 112                 const struct lttng_tracker_id *id, int *value)
 113 {
 114         assert(id);
 115         if (id->type == LTTNG_ID_UNKNOWN) {
 116                 return LTTNG_TRACKER_ID_STATUS_UNSET;
 117         }
 118
 119         if (id->type != LTTNG_ID_VALUE) {
 120                 return LTTNG_TRACKER_ID_STATUS_INVALID;
 121         }
 122
 123         *value = id->value;
 124         return LTTNG_TRACKER_ID_STATUS_OK;
 125 }
 126
 127 bool lttng_tracker_id_is_equal(const struct lttng_tracker_id *left,
 128                 const struct lttng_tracker_id *right)
 129 {
 130         if (left->type != right->type) {
 131                 return 0;
 132         }
 133
 134         switch (left->type) {
 135         case LTTNG_ID_ALL:
 136                 return 1;
 137         case LTTNG_ID_VALUE:
 138                 if (left->value != right->value) {
 139                         return 0;
 140                 }
 141                 break;
 142         case LTTNG_ID_STRING:
 143                 if (strcmp(left->string, right->string) != 0) {
 144                         return 0;
 145                 }
 146                 break;
 147         default:
 148                 /*
 149                  * Normally this should return true, but comparing unset tracker
 150                  * id is "invalid".
 151                  */
 152                 return 0;
 153         }
 154         return 1;
 155 }
 156
 157 int lttng_tracker_id_copy(struct lttng_tracker_id *dest,
 158                 const struct lttng_tracker_id *orig)
 159 {
 160         int ret = 0;
 161         enum lttng_tracker_id_status status;
 162
 163         assert(dest);
 164         assert(orig);
 165
 166         switch (orig->type) {
 167         case LTTNG_ID_ALL:
 168                 status = lttng_tracker_id_set_all(dest);
 169                 break;
 170         case LTTNG_ID_VALUE:
 171                 status = lttng_tracker_id_set_value(dest, orig->value);
 172                 break;
 173         case LTTNG_ID_STRING:
 174                 status = lttng_tracker_id_set_string(dest, orig->string);
 175                 break;
 176         default:
 177                 status = LTTNG_TRACKER_ID_STATUS_OK;
 178                 break;
 179         }
 180
 181         if (status != LTTNG_TRACKER_ID_STATUS_OK) {
 182                 ret = -1;
 183                 goto error;
 184         }
 185 error:
 186         return ret;
 187 }
 188
 189 struct lttng_tracker_id *lttng_tracker_id_duplicate(
 190                 const struct lttng_tracker_id *orig)
 191 {
 192         int ret;
 193         struct lttng_tracker_id *copy = NULL;
 194
 195         copy = lttng_tracker_id_create();
 196         if (copy == NULL) {
 197                 goto error;
 198         }
 199
 200         ret = lttng_tracker_id_copy(copy, orig);
 201         if (ret) {
 202                 goto error;
 203         }
 204
 205         return copy;
 206 error:
 207         lttng_tracker_id_destroy(copy);
 208         return NULL;
 209 }
 210
 211 enum lttng_tracker_id_status lttng_tracker_id_get_string(
 212                 const struct lttng_tracker_id *id, const char **value)
 213 {
 214         assert(id);
 215         if (id->type == LTTNG_ID_UNKNOWN) {
 216                 *value = NULL;
 217                 return LTTNG_TRACKER_ID_STATUS_UNSET;
 218         }
 219
 220         if (id->type != LTTNG_ID_STRING) {
 221                 *value = NULL;
 222                 return LTTNG_TRACKER_ID_STATUS_INVALID;
 223         }
 224
 225         *value = id->string;
 226         return LTTNG_TRACKER_ID_STATUS_OK;
 227 }
 228
 229 struct lttng_tracker_ids *lttng_tracker_ids_create(unsigned int count)
 230 {
 231         struct lttng_tracker_ids *ids = NULL;
 232
 233         ids = zmalloc(sizeof(*ids));
 234         if (!ids) {
 235                 goto error;
 236         }
 237
 238         ids->id_array = zmalloc(sizeof(struct lttng_tracker_id) * count);
 239         if (!ids->id_array) {
 240                 goto error;
 241         }
 242
 243         ids->count = count;
 244
 245         return ids;
 246 error:
 247         free(ids);
 248         return NULL;
 249 }
 250
 251 LTTNG_HIDDEN
 252 struct lttng_tracker_id *lttng_tracker_ids_get_pointer_of_index(
 253                 const struct lttng_tracker_ids *ids, unsigned int index)
 254 {
 255         assert(ids);
 256         if (index >= ids->count) {
 257                 return NULL;
 258         }
 259
 260         return &ids->id_array[index];
 261 }
 262
 263 const struct lttng_tracker_id *lttng_tracker_ids_get_at_index(
 264                 const struct lttng_tracker_ids *ids, unsigned int index)
 265 {
 266         assert(ids);
 267         return lttng_tracker_ids_get_pointer_of_index(ids, index);
 268 }
 269
 270 enum lttng_tracker_id_status lttng_tracker_ids_get_count(const struct lttng_tracker_ids *ids, unsigned int *count)
 271 {
 272
 273         enum lttng_tracker_id_status status = LTTNG_TRACKER_ID_STATUS_OK;
 274
 275         if (!ids || !count) {
 276                 status = LTTNG_TRACKER_ID_STATUS_INVALID;
 277                 goto end;
 278         }
 279
 280         *count = ids->count;
 281 end:
 282         return status;
 283 }
 284
 285 void lttng_tracker_ids_destroy(struct lttng_tracker_ids *ids)
 286 {
 287         int i;
 288
 289         if (!ids) {
 290                 return;
 291         }
 292
 293         for (i = 0; i < ids->count; i++) {
 294                 lttng_tracker_id_reset(&ids->id_array[i]);
 295         }
 296         free(ids->id_array);
 297         free(ids);
 298 }
 299
 300 int lttng_tracker_ids_serialize(const struct lttng_tracker_ids *ids,
 301                 struct lttng_dynamic_buffer *buffer)
 302 {
 303         int ret = 0;
 304         int value;
 305         const char *string = NULL;
 306         unsigned int count;
 307         enum lttng_tracker_id_status status;
 308         const struct lttng_tracker_id *id;
 309         unsigned int i;
 310
 311         status = lttng_tracker_ids_get_count(ids, &count);
 312         if (status != LTTNG_TRACKER_ID_STATUS_OK) {
 313                 ret = LTTNG_ERR_INVALID;
 314                 goto error;
 315         }
 316
 317         for (i = 0; i < count; i++) {
 318                 struct lttcomm_tracker_id_header id_hdr;
 319                 size_t var_data_len = 0;
 320
 321                 id = lttng_tracker_ids_get_at_index(ids, i);
 322                 if (!id) {
 323                         ret = -LTTNG_ERR_INVALID;
 324                         goto error;
 325                 }
 326
 327                 memset(&id_hdr, 0, sizeof(id_hdr));
 328                 id_hdr.type = lttng_tracker_id_get_type(id);
 329                 switch (id_hdr.type) {
 330                 case LTTNG_ID_ALL:
 331                         break;
 332                 case LTTNG_ID_VALUE:
 333                         status = lttng_tracker_id_get_value(id, &value);
 334                         id_hdr.u.value = value;
 335                         if (status != LTTNG_TRACKER_ID_STATUS_OK) {
 336                                 ret = -LTTNG_ERR_INVALID;
 337                                 goto error;
 338                         }
 339                         break;
 340                 case LTTNG_ID_STRING:
 341                         status = lttng_tracker_id_get_string(
 342                                         id, &string);
 343                         if (status != LTTNG_TRACKER_ID_STATUS_OK) {
 344                                 ret = -LTTNG_ERR_INVALID;
 345                                 goto error;
 346                         }
 347
 348                         id_hdr.u.var_data_len = var_data_len =
 349                                         strlen(string) + 1;
 350                         break;
 351                 default:
 352                         ret = -LTTNG_ERR_INVALID;
 353                         goto error;
 354                 }
 355                 ret = lttng_dynamic_buffer_append(
 356                                 buffer, &id_hdr, sizeof(id_hdr));
 357                 if (ret) {
 358                         ret = -LTTNG_ERR_NOMEM;
 359                         goto error;
 360                 }
 361                 ret = lttng_dynamic_buffer_append(
 362                                 buffer, string, var_data_len);
 363                 if (ret) {
 364                         ret = -LTTNG_ERR_NOMEM;
 365                         goto error;
 366                 }
 367         }
 368 error:
 369         return ret;
 370 }