src/registry.c

   1 #include "common.h"
   2
   3 // ----------------------------------------------------------------------------
   4 // TODO
   5 //
   6 // 1. the default tracking cookie expires in 1 year, but the persons are not
   7 //    removed from the db - this means the database only grows - ideally the
   8 //    database should be cleaned in registry_save() for both on-disk and
   9 //    on-memory entries.
  10 //
  11 //    Cleanup:
  12 //    i. Find all the PERSONs that have expired cookie
  13 //    ii. For each of their PERSON_URLs:
  14 //     - decrement the linked MACHINE links
  15 //     - if the linked MACHINE has no other links, remove the linked MACHINE too
  16 //     - remove the PERSON_URL
  17 //
  18 // 2. add protection to prevent abusing the registry by flooding it with
  19 //    requests to fill the memory and crash it.
  20 //
  21 //    Possible protections:
  22 //    - limit the number of URLs per person
  23 //    - limit the number of URLs per machine
  24 //    - limit the number of persons
  25 //    - limit the number of machines
  26 //    - [DONE] limit the size of URLs
  27 //    - [DONE] limit the size of PERSON_URL names
  28 //    - limit the number of requests that add data to the registry,
  29 //      per client IP per hour
  30
  31
  32
  33 #define REGISTRY_URL_FLAGS_DEFAULT 0x00
  34 #define REGISTRY_URL_FLAGS_EXPIRED 0x01
  35
  36 #define DICTIONARY_FLAGS DICTIONARY_FLAG_VALUE_LINK_DONT_CLONE | DICTIONARY_FLAG_NAME_LINK_DONT_CLONE
  37
  38 // ----------------------------------------------------------------------------
  39 // COMMON structures
  40
  41 struct registry {
  42         int enabled;
  43
  44         char machine_guid[36 + 1];
  45
  46         // entries counters / statistics
  47         unsigned long long persons_count;
  48         unsigned long long machines_count;
  49         unsigned long long usages_count;
  50         unsigned long long urls_count;
  51         unsigned long long persons_urls_count;
  52         unsigned long long machines_urls_count;
  53         unsigned long long log_count;
  54
  55         // memory counters / statistics
  56         unsigned long long persons_memory;
  57         unsigned long long machines_memory;
  58         unsigned long long urls_memory;
  59         unsigned long long persons_urls_memory;
  60         unsigned long long machines_urls_memory;
  61
  62         // configuration
  63         unsigned long long save_registry_every_entries;
  64         char *registry_domain;
  65         char *hostname;
  66         char *registry_to_announce;
  67         time_t persons_expiration; // seconds to expire idle persons
  68         int verify_cookies_redirects;
  69
  70         size_t max_url_length;
  71         size_t max_name_length;
  72
  73         // file/path names
  74         char *pathname;
  75         char *db_filename;
  76         char *log_filename;
  77         char *machine_guid_filename;
  78
  79         // open files
  80         FILE *log_fp;
  81
  82         // the database
  83         DICTIONARY *persons;    // dictionary of PERSON *, with key the PERSON.guid
  84         DICTIONARY *machines;   // dictionary of MACHINE *, with key the MACHINE.guid
  85         DICTIONARY *urls;               // dictionary of URL *, with key the URL.url
  86
  87         // concurrency locking
  88         // we keep different locks for different things
  89         // so that many tasks can be completed in parallel
  90         pthread_mutex_t persons_lock;
  91         pthread_mutex_t machines_lock;
  92         pthread_mutex_t urls_lock;
  93         pthread_mutex_t person_urls_lock;
  94         pthread_mutex_t machine_urls_lock;
  95         pthread_mutex_t log_lock;
  96 } registry;
  97
  98
  99 // ----------------------------------------------------------------------------
 100 // URL structures
 101 // Save memory by de-duplicating URLs
 102 // so instead of storing URLs all over the place
 103 // we store them here and we keep pointers elsewhere
 104
 105 struct url {
 106         uint32_t links; // the number of links to this URL - when none is left, we free it
 107         uint16_t len;   // the length of the URL in bytes
 108         char url[1];    // the URL - dynamically allocated to more size
 109 };
 110 typedef struct url URL;
 111
 112
 113 // ----------------------------------------------------------------------------
 114 // MACHINE structures
 115
 116 // For each MACHINE-URL pair we keep this
 117 struct machine_url {
 118         URL *url;                                       // de-duplicated URL
 119 //      DICTIONARY *persons;            // dictionary of PERSON *
 120
 121         uint8_t flags;
 122         uint32_t first_t;                       // the first time we saw this
 123         uint32_t last_t;                        // the last time we saw this
 124         uint32_t usages;                        // how many times this has been accessed
 125 };
 126 typedef struct machine_url MACHINE_URL;
 127
 128 // A machine
 129 struct machine {
 130         char guid[36 + 1];                      // the GUID
 131
 132         uint32_t links;                         // the number of PERSON_URLs linked to this machine
 133
 134         DICTIONARY *urls;                       // MACHINE_URL *
 135
 136         uint32_t first_t;                       // the first time we saw this
 137         uint32_t last_t;                        // the last time we saw this
 138         uint32_t usages;                        // how many times this has been accessed
 139 };
 140 typedef struct machine MACHINE;
 141
 142
 143 // ----------------------------------------------------------------------------
 144 // PERSON structures
 145
 146 // for each PERSON-URL pair we keep this
 147 struct person_url {
 148         URL *url;                                       // de-duplicated URL
 149         MACHINE *machine;                       // link the MACHINE of this URL
 150
 151         uint8_t flags;
 152         uint32_t first_t;                       // the first time we saw this
 153         uint32_t last_t;                        // the last time we saw this
 154         uint32_t usages;                        // how many times this has been accessed
 155
 156         char name[1];                           // the name of the URL, as known by the user
 157                                                                 // dynamically allocated to fit properly
 158 };
 159 typedef struct person_url PERSON_URL;
 160
 161 // A person
 162 struct person {
 163         char guid[36 + 1];                      // the person GUID
 164
 165         DICTIONARY *urls;                       // dictionary of PERSON_URL *
 166
 167         uint32_t first_t;                       // the first time we saw this
 168         uint32_t last_t;                        // the last time we saw this
 169         uint32_t usages;                        // how many times this has been accessed
 170 };
 171 typedef struct person PERSON;
 172
 173
 174 // ----------------------------------------------------------------------------
 175 // REGISTRY concurrency locking
 176
 177 static inline void registry_persons_lock(void) {
 178         pthread_mutex_lock(&registry.persons_lock);
 179 }
 180
 181 static inline void registry_persons_unlock(void) {
 182         pthread_mutex_unlock(&registry.persons_lock);
 183 }
 184
 185 static inline void registry_machines_lock(void) {
 186         pthread_mutex_lock(&registry.machines_lock);
 187 }
 188
 189 static inline void registry_machines_unlock(void) {
 190         pthread_mutex_unlock(&registry.machines_lock);
 191 }
 192
 193 static inline void registry_urls_lock(void) {
 194         pthread_mutex_lock(&registry.urls_lock);
 195 }
 196
 197 static inline void registry_urls_unlock(void) {
 198         pthread_mutex_unlock(&registry.urls_lock);
 199 }
 200
 201 // ideally, we should not lock the whole registry for
 202 // updating a person's urls.
 203 // however, to save the memory required for keeping a
 204 // mutex (40 bytes) per person, we do...
 205 static inline void registry_person_urls_lock(PERSON *p) {
 206         (void)p;
 207         pthread_mutex_lock(&registry.person_urls_lock);
 208 }
 209
 210 static inline void registry_person_urls_unlock(PERSON *p) {
 211         (void)p;
 212         pthread_mutex_unlock(&registry.person_urls_lock);
 213 }
 214
 215 // ideally, we should not lock the whole registry for
 216 // updating a machine's urls.
 217 // however, to save the memory required for keeping a
 218 // mutex (40 bytes) per machine, we do...
 219 static inline void registry_machine_urls_lock(MACHINE *m) {
 220         (void)m;
 221         pthread_mutex_lock(&registry.machine_urls_lock);
 222 }
 223
 224 static inline void registry_machine_urls_unlock(MACHINE *m) {
 225         (void)m;
 226         pthread_mutex_unlock(&registry.machine_urls_lock);
 227 }
 228
 229 static inline void registry_log_lock(void) {
 230         pthread_mutex_lock(&registry.log_lock);
 231 }
 232
 233 static inline void registry_log_unlock(void) {
 234         pthread_mutex_unlock(&registry.log_lock);
 235 }
 236
 237
 238 // ----------------------------------------------------------------------------
 239 // common functions
 240
 241 // parse a GUID and re-generated to be always lower case
 242 // this is used as a protection against the variations of GUIDs
 243 static inline int registry_regenerate_guid(const char *guid, char *result) {
 244         uuid_t uuid;
 245         if(unlikely(uuid_parse(guid, uuid) == -1)) {
 246                 info("Registry: GUID '%s' is not a valid GUID.", guid);
 247                 return -1;
 248         }
 249         else {
 250                 uuid_unparse_lower(uuid, result);
 251
 252 #ifdef NETDATA_INTERNAL_CHECKS
 253                 if(strcmp(guid, result))
 254                         info("Registry: source GUID '%s' and re-generated GUID '%s' differ!", guid, result);
 255 #endif /* NETDATA_INTERNAL_CHECKS */
 256         }
 257
 258         return 0;
 259 }
 260
 261 // make sure the names of the machines / URLs do not contain any tabs
 262 // (which are used as our separator in the database files)
 263 // and are properly trimmed (before and after)
 264 static inline char *registry_fix_machine_name(char *name, size_t *len) {
 265         char *s = name?name:"";
 266
 267         // skip leading spaces
 268         while(*s && isspace(*s)) s++;
 269
 270         // make sure all spaces are a SPACE
 271         char *t = s;
 272         while(*t) {
 273                 if(unlikely(isspace(*t)))
 274                         *t = ' ';
 275
 276                 t++;
 277         }
 278
 279         // remove trailing spaces
 280         while(--t >= s) {
 281                 if(*t == ' ')
 282                         *t = '\0';
 283                 else
 284                         break;
 285         }
 286         t++;
 287
 288         if(likely(len))
 289                 *len = (t - s);
 290
 291         return s;
 292 }
 293
 294 static inline char *registry_fix_url(char *url, size_t *len) {
 295         return registry_fix_machine_name(url, len);
 296 }
 297
 298
 299 // ----------------------------------------------------------------------------
 300 // forward definition of functions
 301
 302 extern PERSON *registry_request_access(char *person_guid, char *machine_guid, char *url, char *name, time_t when);
 303 extern PERSON *registry_request_delete(char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when);
 304
 305
 306 // ----------------------------------------------------------------------------
 307 // URL
 308
 309 static inline URL *registry_url_allocate_nolock(const char *url, size_t urllen) {
 310         // protection from too big URLs
 311         if(urllen > registry.max_url_length)
 312                 urllen = registry.max_url_length;
 313
 314         debug(D_REGISTRY, "Registry: registry_url_allocate_nolock('%s'): allocating %zu bytes", url, sizeof(URL) + urllen);
 315         URL *u = mallocz(sizeof(URL) + urllen);
 316
 317         // a simple strcpy() should do the job
 318         // but I prefer to be safe, since the caller specified urllen
 319         u->len = (uint16_t)urllen;
 320         strncpyz(u->url, url, u->len);
 321         u->links = 0;
 322
 323         registry.urls_memory += sizeof(URL) + urllen;
 324
 325         debug(D_REGISTRY, "Registry: registry_url_allocate_nolock('%s'): indexing it", url);
 326         dictionary_set(registry.urls, u->url, u, sizeof(URL));
 327
 328         return u;
 329 }
 330
 331 static inline URL *registry_url_get(const char *url, size_t urllen) {
 332         debug(D_REGISTRY, "Registry: registry_url_get('%s')", url);
 333
 334         registry_urls_lock();
 335
 336         URL *u = dictionary_get(registry.urls, url);
 337         if(!u) {
 338                 u = registry_url_allocate_nolock(url, urllen);
 339                 registry.urls_count++;
 340         }
 341
 342         registry_urls_unlock();
 343
 344         return u;
 345 }
 346
 347 static inline void registry_url_link_nolock(URL *u) {
 348         u->links++;
 349         debug(D_REGISTRY, "Registry: registry_url_link_nolock('%s'): URL has now %u links", u->url, u->links);
 350 }
 351
 352 static inline void registry_url_unlink_nolock(URL *u) {
 353         u->links--;
 354         if(!u->links) {
 355                 debug(D_REGISTRY, "Registry: registry_url_unlink_nolock('%s'): No more links for this URL", u->url);
 356                 dictionary_del(registry.urls, u->url);
 357                 freez(u);
 358         }
 359         else
 360                 debug(D_REGISTRY, "Registry: registry_url_unlink_nolock('%s'): URL has %u links left", u->url, u->links);
 361 }
 362
 363
 364 // ----------------------------------------------------------------------------
 365 // MACHINE
 366
 367 static inline MACHINE *registry_machine_find(const char *machine_guid) {
 368         debug(D_REGISTRY, "Registry: registry_machine_find('%s')", machine_guid);
 369         return dictionary_get(registry.machines, machine_guid);
 370 }
 371
 372 static inline MACHINE_URL *registry_machine_url_allocate(MACHINE *m, URL *u, time_t when) {
 373         debug(D_REGISTRY, "registry_machine_link_to_url('%s', '%s'): allocating %zu bytes", m->guid, u->url, sizeof(MACHINE_URL));
 374
 375         MACHINE_URL *mu = mallocz(sizeof(MACHINE_URL));
 376
 377         // mu->persons = dictionary_create(DICTIONARY_FLAGS);
 378         // dictionary_set(mu->persons, p->guid, p, sizeof(PERSON));
 379
 380         mu->first_t = mu->last_t = (uint32_t)when;
 381         mu->usages = 1;
 382         mu->url = u;
 383         mu->flags = REGISTRY_URL_FLAGS_DEFAULT;
 384
 385         registry.machines_urls_memory += sizeof(MACHINE_URL);
 386
 387         debug(D_REGISTRY, "registry_machine_link_to_url('%s', '%s'): indexing URL in machine", m->guid, u->url);
 388         dictionary_set(m->urls, u->url, mu, sizeof(MACHINE_URL));
 389         registry_url_link_nolock(u);
 390
 391         return mu;
 392 }
 393
 394 static inline MACHINE *registry_machine_allocate(const char *machine_guid, time_t when) {
 395         debug(D_REGISTRY, "Registry: registry_machine_allocate('%s'): creating new machine, sizeof(MACHINE)=%zu", machine_guid, sizeof(MACHINE));
 396
 397         MACHINE *m = mallocz(sizeof(MACHINE));
 398
 399         strncpyz(m->guid, machine_guid, 36);
 400
 401         debug(D_REGISTRY, "Registry: registry_machine_allocate('%s'): creating dictionary of urls", machine_guid);
 402         m->urls = dictionary_create(DICTIONARY_FLAGS);
 403
 404         m->first_t = m->last_t = (uint32_t)when;
 405         m->usages = 0;
 406
 407         registry.machines_memory += sizeof(MACHINE);
 408
 409         registry.machines_count++;
 410         dictionary_set(registry.machines, m->guid, m, sizeof(MACHINE));
 411
 412         return m;
 413 }
 414
 415 // 1. validate machine GUID
 416 // 2. if it is valid, find it or create it and return it
 417 // 3. if it is not valid, return NULL
 418 static inline MACHINE *registry_machine_get(const char *machine_guid, time_t when) {
 419         MACHINE *m = NULL;
 420
 421         registry_machines_lock();
 422
 423         if(likely(machine_guid && *machine_guid)) {
 424                 // validate it is a GUID
 425                 char buf[36 + 1];
 426                 if(unlikely(registry_regenerate_guid(machine_guid, buf) == -1))
 427                         info("Registry: machine guid '%s' is not a valid guid. Ignoring it.", machine_guid);
 428                 else {
 429                         machine_guid = buf;
 430                         m = registry_machine_find(machine_guid);
 431                         if(!m) m = registry_machine_allocate(machine_guid, when);
 432                 }
 433         }
 434
 435         registry_machines_unlock();
 436
 437         return m;
 438 }
 439
 440
 441 // ----------------------------------------------------------------------------
 442 // PERSON
 443
 444 static inline PERSON *registry_person_find(const char *person_guid) {
 445         debug(D_REGISTRY, "Registry: registry_person_find('%s')", person_guid);
 446         return dictionary_get(registry.persons, person_guid);
 447 }
 448
 449 static inline PERSON_URL *registry_person_url_allocate(PERSON *p, MACHINE *m, URL *u, char *name, size_t namelen, time_t when) {
 450         // protection from too big names
 451         if(namelen > registry.max_name_length)
 452                 namelen = registry.max_name_length;
 453
 454         debug(D_REGISTRY, "registry_person_url_allocate('%s', '%s', '%s'): allocating %zu bytes", p->guid, m->guid, u->url,
 455                   sizeof(PERSON_URL) + namelen);
 456
 457         PERSON_URL *pu = mallocz(sizeof(PERSON_URL) + namelen);
 458
 459         // a simple strcpy() should do the job
 460         // but I prefer to be safe, since the caller specified urllen
 461         strncpyz(pu->name, name, namelen);
 462
 463         pu->machine = m;
 464         pu->first_t = pu->last_t = when;
 465         pu->usages = 1;
 466         pu->url = u;
 467         pu->flags = REGISTRY_URL_FLAGS_DEFAULT;
 468         m->links++;
 469
 470         registry.persons_urls_memory += sizeof(PERSON_URL) + namelen;
 471
 472         debug(D_REGISTRY, "registry_person_url_allocate('%s', '%s', '%s'): indexing URL in person", p->guid, m->guid, u->url);
 473         dictionary_set(p->urls, u->url, pu, sizeof(PERSON_URL));
 474         registry_url_link_nolock(u);
 475
 476         return pu;
 477 }
 478
 479 static inline PERSON_URL *registry_person_url_reallocate(PERSON *p, MACHINE *m, URL *u, char *name, size_t namelen, time_t when, PERSON_URL *pu) {
 480         // this function is needed to change the name of a PERSON_URL
 481
 482         debug(D_REGISTRY, "registry_person_url_reallocate('%s', '%s', '%s'): allocating %zu bytes", p->guid, m->guid, u->url,
 483                   sizeof(PERSON_URL) + namelen);
 484
 485         PERSON_URL *tpu = registry_person_url_allocate(p, m, u, name, namelen, when);
 486         tpu->first_t = pu->first_t;
 487         tpu->last_t = pu->last_t;
 488         tpu->usages = pu->usages;
 489
 490         // ok, these are a hack - since the registry_person_url_allocate() is
 491         // adding these, we have to subtract them
 492         tpu->machine->links--;
 493         registry.persons_urls_memory -= sizeof(PERSON_URL) + strlen(pu->name);
 494         registry_url_unlink_nolock(u);
 495
 496         freez(pu);
 497
 498         return tpu;
 499 }
 500
 501 static inline PERSON *registry_person_allocate(const char *person_guid, time_t when) {
 502         PERSON *p = NULL;
 503
 504         debug(D_REGISTRY, "Registry: registry_person_allocate('%s'): allocating new person, sizeof(PERSON)=%zu", (person_guid)?person_guid:"", sizeof(PERSON));
 505
 506         p = mallocz(sizeof(PERSON));
 507
 508         if(!person_guid) {
 509                 for (; ;) {
 510                         uuid_t uuid;
 511                         uuid_generate(uuid);
 512                         uuid_unparse_lower(uuid, p->guid);
 513
 514                         debug(D_REGISTRY, "Registry: Checking if the generated person guid '%s' is unique", p->guid);
 515                         if (!dictionary_get(registry.persons, p->guid)) {
 516                                 debug(D_REGISTRY, "Registry: generated person guid '%s' is unique", p->guid);
 517                                 break;
 518                         }
 519                         else
 520                                 info("Registry: generated person guid '%s' found in the registry. Retrying...", p->guid);
 521                 }
 522         }
 523         else
 524                 strncpyz(p->guid, person_guid, 36);
 525
 526         debug(D_REGISTRY, "Registry: registry_person_allocate('%s'): creating dictionary of urls", p->guid);
 527         p->urls = dictionary_create(DICTIONARY_FLAGS);
 528
 529         p->first_t = p->last_t = when;
 530         p->usages = 0;
 531
 532         registry.persons_memory += sizeof(PERSON);
 533
 534         registry.persons_count++;
 535         dictionary_set(registry.persons, p->guid, p, sizeof(PERSON));
 536
 537         return p;
 538 }
 539
 540
 541 // 1. validate person GUID
 542 // 2. if it is valid, find it
 543 // 3. if it is not valid, create a new one
 544 // 4. return it
 545 static inline PERSON *registry_person_get(const char *person_guid, time_t when) {
 546         PERSON *p = NULL;
 547
 548         registry_persons_lock();
 549
 550         if(person_guid && *person_guid) {
 551                 char buf[36 + 1];
 552                 // validate it is a GUID
 553                 if(unlikely(registry_regenerate_guid(person_guid, buf) == -1))
 554                         info("Registry: person guid '%s' is not a valid guid. Ignoring it.", person_guid);
 555                 else {
 556                         person_guid = buf;
 557                         p = registry_person_find(person_guid);
 558                         if(!p) person_guid = NULL;
 559                 }
 560         }
 561
 562         if(!p) p = registry_person_allocate(NULL, when);
 563
 564         registry_persons_unlock();
 565
 566         return p;
 567 }
 568
 569 // ----------------------------------------------------------------------------
 570 // LINKING OF OBJECTS
 571
 572 static inline PERSON_URL *registry_person_link_to_url(PERSON *p, MACHINE *m, URL *u, char *name, size_t namelen, time_t when) {
 573         debug(D_REGISTRY, "registry_person_link_to_url('%s', '%s', '%s'): searching for URL in person", p->guid, m->guid, u->url);
 574
 575         registry_person_urls_lock(p);
 576
 577         PERSON_URL *pu = dictionary_get(p->urls, u->url);
 578         if(!pu) {
 579                 debug(D_REGISTRY, "registry_person_link_to_url('%s', '%s', '%s'): not found", p->guid, m->guid, u->url);
 580                 pu = registry_person_url_allocate(p, m, u, name, namelen, when);
 581                 registry.persons_urls_count++;
 582         }
 583         else {
 584                 debug(D_REGISTRY, "registry_person_link_to_url('%s', '%s', '%s'): found", p->guid, m->guid, u->url);
 585                 pu->usages++;
 586                 if(likely(pu->last_t < (uint32_t)when)) pu->last_t = when;
 587
 588                 if(pu->machine != m) {
 589                         MACHINE_URL *mu = dictionary_get(pu->machine->urls, u->url);
 590                         if(mu) {
 591                                 info("registry_person_link_to_url('%s', '%s', '%s'): URL switched machines (old was '%s') - expiring it from previous machine.",
 592                                          p->guid, m->guid, u->url, pu->machine->guid);
 593                                 mu->flags |= REGISTRY_URL_FLAGS_EXPIRED;
 594                         }
 595                         else {
 596                                 info("registry_person_link_to_url('%s', '%s', '%s'): URL switched machines (old was '%s') - but the URL is not linked to the old machine.",
 597                                          p->guid, m->guid, u->url, pu->machine->guid);
 598                         }
 599
 600                         pu->machine->links--;
 601                         pu->machine = m;
 602                 }
 603
 604                 if(strcmp(pu->name, name)) {
 605                         // the name of the PERSON_URL has changed !
 606                         pu = registry_person_url_reallocate(p, m, u, name, namelen, when, pu);
 607                 }
 608         }
 609
 610         p->usages++;
 611         if(likely(p->last_t < (uint32_t)when)) p->last_t = when;
 612
 613         if(pu->flags & REGISTRY_URL_FLAGS_EXPIRED) {
 614                 info("registry_person_link_to_url('%s', '%s', '%s'): accessing an expired URL. Re-enabling URL.", p->guid, m->guid, u->url);
 615                 pu->flags &= ~REGISTRY_URL_FLAGS_EXPIRED;
 616         }
 617
 618         registry_person_urls_unlock(p);
 619
 620         return pu;
 621 }
 622
 623 static inline MACHINE_URL *registry_machine_link_to_url(PERSON *p, MACHINE *m, URL *u, time_t when) {
 624         debug(D_REGISTRY, "registry_machine_link_to_url('%s', '%s', '%s'): searching for URL in machine", p->guid, m->guid, u->url);
 625
 626         registry_machine_urls_lock(m);
 627
 628         MACHINE_URL *mu = dictionary_get(m->urls, u->url);
 629         if(!mu) {
 630                 debug(D_REGISTRY, "registry_machine_link_to_url('%s', '%s', '%s'): not found", p->guid, m->guid, u->url);
 631                 mu = registry_machine_url_allocate(m, u, when);
 632                 registry.machines_urls_count++;
 633         }
 634         else {
 635                 debug(D_REGISTRY, "registry_machine_link_to_url('%s', '%s', '%s'): found", p->guid, m->guid, u->url);
 636                 mu->usages++;
 637                 if(likely(mu->last_t < (uint32_t)when)) mu->last_t = when;
 638         }
 639
 640         //debug(D_REGISTRY, "registry_machine_link_to_url('%s', '%s', '%s'): indexing person in machine", p->guid, m->guid, u->url);
 641         //dictionary_set(mu->persons, p->guid, p, sizeof(PERSON));
 642
 643         m->usages++;
 644         if(likely(m->last_t < (uint32_t)when)) m->last_t = when;
 645
 646         if(mu->flags & REGISTRY_URL_FLAGS_EXPIRED) {
 647                 info("registry_machine_link_to_url('%s', '%s', '%s'): accessing an expired URL.", p->guid, m->guid, u->url);
 648                 mu->flags &= ~REGISTRY_URL_FLAGS_EXPIRED;
 649         }
 650
 651         registry_machine_urls_unlock(m);
 652
 653         return mu;
 654 }
 655
 656 // ----------------------------------------------------------------------------
 657 // REGISTRY LOG LOAD/SAVE
 658
 659 static inline int registry_should_save_db(void) {
 660         debug(D_REGISTRY, "log entries %llu, max %llu", registry.log_count, registry.save_registry_every_entries);
 661         return registry.log_count > registry.save_registry_every_entries;
 662 }
 663
 664 static inline void registry_log(const char action, PERSON *p, MACHINE *m, URL *u, char *name) {
 665         if(likely(registry.log_fp)) {
 666                 // we lock only if the file is open
 667                 // to allow replaying the log at registry_log_load()
 668                 registry_log_lock();
 669
 670                 if(unlikely(fprintf(registry.log_fp, "%c\t%08x\t%s\t%s\t%s\t%s\n",
 671                                 action,
 672                                 p->last_t,
 673                                 p->guid,
 674                                 m->guid,
 675                                 name,
 676                                 u->url) < 0))
 677                         error("Registry: failed to save log. Registry data may be lost in case of abnormal restart.");
 678
 679                 // we increase the counter even on failures
 680                 // so that the registry will be saved periodically
 681                 registry.log_count++;
 682
 683                 registry_log_unlock();
 684
 685                 // this must be outside the log_lock(), or a deadlock will happen.
 686                 // registry_save() checks the same inside the log_lock, so only
 687                 // one thread will save the db
 688                 if(unlikely(registry_should_save_db()))
 689                         registry_save();
 690         }
 691 }
 692
 693 static inline int registry_log_open_nolock(void) {
 694         if(registry.log_fp)
 695                 fclose(registry.log_fp);
 696
 697         registry.log_fp = fopen(registry.log_filename, "a");
 698
 699         if(registry.log_fp) {
 700                 if (setvbuf(registry.log_fp, NULL, _IOLBF, 0) != 0)
 701                         error("Cannot set line buffering on registry log file.");
 702                 return 0;
 703         }
 704
 705         error("Cannot open registry log file '%s'. Registry data will be lost in case of netdata or server crash.", registry.log_filename);
 706         return -1;
 707 }
 708
 709 static inline void registry_log_close_nolock(void) {
 710         if(registry.log_fp) {
 711                 fclose(registry.log_fp);
 712                 registry.log_fp = NULL;
 713         }
 714 }
 715
 716 static inline void registry_log_recreate_nolock(void) {
 717         if(registry.log_fp != NULL) {
 718                 registry_log_close_nolock();
 719
 720                 // open it with truncate
 721                 registry.log_fp = fopen(registry.log_filename, "w");
 722                 if(registry.log_fp) fclose(registry.log_fp);
 723                 else error("Cannot truncate registry log '%s'", registry.log_filename);
 724
 725                 registry.log_fp = NULL;
 726
 727                 registry_log_open_nolock();
 728         }
 729 }
 730
 731 int registry_log_load(void) {
 732         char *s, buf[4096 + 1];
 733         size_t line = -1;
 734
 735         // closing the log is required here
 736         // otherwise we will append to it the values we read
 737         registry_log_close_nolock();
 738
 739         debug(D_REGISTRY, "Registry: loading active db from: %s", registry.log_filename);
 740         FILE *fp = fopen(registry.log_filename, "r");
 741         if(!fp)
 742                 error("Registry: cannot open registry file: %s", registry.log_filename);
 743         else {
 744                 line = 0;
 745                 size_t len = 0;
 746                 while ((s = fgets_trim_len(buf, 4096, fp, &len))) {
 747                         line++;
 748
 749                         switch (s[0]) {
 750                                 case 'A': // accesses
 751                                 case 'D': // deletes
 752
 753                                         // verify it is valid
 754                                         if (unlikely(len < 85 || s[1] != '\t' || s[10] != '\t' || s[47] != '\t' || s[84] != '\t')) {
 755                                                 error("Registry: log line %zu is wrong (len = %zu).", line, len);
 756                                                 continue;
 757                                         }
 758                                         s[1] = s[10] = s[47] = s[84] = '\0';
 759
 760                                         // get the variables
 761                                         time_t when = strtoul(&s[2], NULL, 16);
 762                                         char *person_guid = &s[11];
 763                                         char *machine_guid = &s[48];
 764                                         char *name = &s[85];
 765
 766                                         // skip the name to find the url
 767                                         char *url = name;
 768                                         while(*url && *url != '\t') url++;
 769                                         if(!*url) {
 770                                                 error("Registry: log line %zu does not have a url.", line);
 771                                                 continue;
 772                                         }
 773                                         *url++ = '\0';
 774
 775                                         // make sure the person exists
 776                                         // without this, a new person guid will be created
 777                                         PERSON *p = registry_person_find(person_guid);
 778                                         if(!p) p = registry_person_allocate(person_guid, when);
 779
 780                                         if(s[0] == 'A')
 781                                                 registry_request_access(p->guid, machine_guid, url, name, when);
 782                                         else
 783                                                 registry_request_delete(p->guid, machine_guid, url, name, when);
 784
 785                                         break;
 786
 787                                 default:
 788                                         error("Registry: ignoring line %zu of filename '%s': %s.", line, registry.log_filename, s);
 789                                         break;
 790                         }
 791                 }
 792
 793                 fclose(fp);
 794         }
 795
 796         // open the log again
 797         registry_log_open_nolock();
 798
 799         return line;
 800 }
 801
 802
 803 // ----------------------------------------------------------------------------
 804 // REGISTRY REQUESTS
 805
 806 PERSON *registry_request_access(char *person_guid, char *machine_guid, char *url, char *name, time_t when) {
 807         debug(D_REGISTRY, "registry_request_access('%s', '%s', '%s'): NEW REQUEST", (person_guid)?person_guid:"", machine_guid, url);
 808
 809         MACHINE *m = registry_machine_get(machine_guid, when);
 810         if(!m) return NULL;
 811
 812         // make sure the name is valid
 813         size_t namelen;
 814         name = registry_fix_machine_name(name, &namelen);
 815
 816         size_t urllen;
 817         url = registry_fix_url(url, &urllen);
 818
 819         URL *u = registry_url_get(url, urllen);
 820         PERSON *p = registry_person_get(person_guid, when);
 821
 822         registry_person_link_to_url(p, m, u, name, namelen, when);
 823         registry_machine_link_to_url(p, m, u, when);
 824
 825         registry_log('A', p, m, u, name);
 826
 827         registry.usages_count++;
 828         return p;
 829 }
 830
 831 // verify the person, the machine and the URL exist in our DB
 832 PERSON_URL *registry_verify_request(char *person_guid, char *machine_guid, char *url, PERSON **pp, MACHINE **mm) {
 833         char pbuf[36 + 1], mbuf[36 + 1];
 834
 835         if(!person_guid || !*person_guid || !machine_guid || !*machine_guid || !url || !*url) {
 836                 info("Registry Request Verification: invalid request! person: '%s', machine '%s', url '%s'", person_guid?person_guid:"UNSET", machine_guid?machine_guid:"UNSET", url?url:"UNSET");
 837                 return NULL;
 838         }
 839
 840         // normalize the url
 841         url = registry_fix_url(url, NULL);
 842
 843         // make sure the person GUID is valid
 844         if(registry_regenerate_guid(person_guid, pbuf) == -1) {
 845                 info("Registry Request Verification: invalid person GUID, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
 846                 return NULL;
 847         }
 848         person_guid = pbuf;
 849
 850         // make sure the machine GUID is valid
 851         if(registry_regenerate_guid(machine_guid, mbuf) == -1) {
 852                 info("Registry Request Verification: invalid machine GUID, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
 853                 return NULL;
 854         }
 855         machine_guid = mbuf;
 856
 857         // make sure the machine exists
 858         MACHINE *m = registry_machine_find(machine_guid);
 859         if(!m) {
 860                 info("Registry Request Verification: machine not found, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
 861                 return NULL;
 862         }
 863         if(mm) *mm = m;
 864
 865         // make sure the person exist
 866         PERSON *p = registry_person_find(person_guid);
 867         if(!p) {
 868                 info("Registry Request Verification: person not found, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
 869                 return NULL;
 870         }
 871         if(pp) *pp = p;
 872
 873         PERSON_URL *pu = dictionary_get(p->urls, url);
 874         if(!pu) {
 875                 info("Registry Request Verification: URL not found for person, person: '%s', machine '%s', url '%s'", person_guid, machine_guid, url);
 876                 return NULL;
 877         }
 878         return pu;
 879 }
 880
 881 PERSON *registry_request_delete(char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when) {
 882         (void)when;
 883
 884         PERSON *p = NULL;
 885         MACHINE *m = NULL;
 886         PERSON_URL *pu = registry_verify_request(person_guid, machine_guid, url, &p, &m);
 887         if(!pu || !p || !m) return NULL;
 888
 889         // normalize the url
 890         delete_url = registry_fix_url(delete_url, NULL);
 891
 892         // make sure the user is not deleting the url it uses
 893         if(!strcmp(delete_url, pu->url->url)) {
 894                 info("Registry Delete Request: delete URL is the one currently accessed, person: '%s', machine '%s', url '%s', delete url '%s'", p->guid, m->guid, pu->url->url, delete_url);
 895                 return NULL;
 896         }
 897
 898         registry_person_urls_lock(p);
 899
 900         PERSON_URL *dpu = dictionary_get(p->urls, delete_url);
 901         if(!dpu) {
 902                 info("Registry Delete Request: URL not found for person: '%s', machine '%s', url '%s', delete url '%s'", p->guid, m->guid, pu->url->url, delete_url);
 903                 registry_person_urls_unlock(p);
 904                 return NULL;
 905         }
 906
 907         registry_log('D', p, m, pu->url, dpu->url->url);
 908
 909         dictionary_del(p->urls, dpu->url->url);
 910         registry_url_unlink_nolock(dpu->url);
 911         freez(dpu);
 912
 913         registry_person_urls_unlock(p);
 914         return p;
 915 }
 916
 917
 918 // a structure to pass to the dictionary_get_all() callback handler
 919 struct machine_request_callback_data {
 920         MACHINE *find_this_machine;
 921         PERSON_URL *result;
 922 };
 923
 924 // the callback function
 925 // this will be run for every PERSON_URL of this PERSON
 926 int machine_request_callback(void *entry, void *data) {
 927         PERSON_URL *mypu = (PERSON_URL *)entry;
 928         struct machine_request_callback_data *myrdata = (struct machine_request_callback_data *)data;
 929
 930         if(mypu->machine == myrdata->find_this_machine) {
 931                 myrdata->result = mypu;
 932                 return -1; // this will also stop the walk through
 933         }
 934
 935         return 0; // continue
 936 }
 937
 938 MACHINE *registry_request_machine(char *person_guid, char *machine_guid, char *url, char *request_machine, time_t when) {
 939         (void)when;
 940
 941         char mbuf[36 + 1];
 942
 943         PERSON *p = NULL;
 944         MACHINE *m = NULL;
 945         PERSON_URL *pu = registry_verify_request(person_guid, machine_guid, url, &p, &m);
 946         if(!pu || !p || !m) return NULL;
 947
 948         // make sure the machine GUID is valid
 949         if(registry_regenerate_guid(request_machine, mbuf) == -1) {
 950                 info("Registry Machine URLs request: invalid machine GUID, person: '%s', machine '%s', url '%s', request machine '%s'", p->guid, m->guid, pu->url->url, request_machine);
 951                 return NULL;
 952         }
 953         request_machine = mbuf;
 954
 955         // make sure the machine exists
 956         m = registry_machine_find(request_machine);
 957         if(!m) {
 958                 info("Registry Machine URLs request: machine not found, person: '%s', machine '%s', url '%s', request machine '%s'", p->guid, m->guid, pu->url->url, request_machine);
 959                 return NULL;
 960         }
 961
 962         // Verify the user has in the past accessed this machine
 963         // We will walk through the PERSON_URLs to find the machine
 964         // linking to our machine
 965
 966         // a structure to pass to the dictionary_get_all() callback handler
 967         struct machine_request_callback_data rdata = { m, NULL };
 968
 969         // request a walk through on the dictionary
 970         // no need for locking here, the underlying dictionary has its own
 971         dictionary_get_all(p->urls, machine_request_callback, &rdata);
 972
 973         if(rdata.result)
 974                 return m;
 975
 976         return NULL;
 977 }
 978
 979
 980 // ----------------------------------------------------------------------------
 981 // REGISTRY JSON generation
 982
 983 #define REGISTRY_STATUS_OK "ok"
 984 #define REGISTRY_STATUS_FAILED "failed"
 985 #define REGISTRY_STATUS_DISABLED "disabled"
 986
 987 int registry_verify_cookies_redirects(void) {
 988         return registry.verify_cookies_redirects;
 989 }
 990
 991 const char *registry_to_announce(void) {
 992         return registry.registry_to_announce;
 993 }
 994
 995 void registry_set_cookie(struct web_client *w, const char *guid) {
 996         char edate[100];
 997         time_t et = time(NULL) + registry.persons_expiration;
 998         struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
 999         strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
1000
1001         snprintfz(w->cookie1, COOKIE_MAX, NETDATA_REGISTRY_COOKIE_NAME "=%s; Expires=%s", guid, edate);
1002
1003         if(registry.registry_domain && registry.registry_domain[0])
1004                 snprintfz(w->cookie2, COOKIE_MAX, NETDATA_REGISTRY_COOKIE_NAME "=%s; Domain=%s; Expires=%s", guid, registry.registry_domain, edate);
1005 }
1006
1007 static inline void registry_set_person_cookie(struct web_client *w, PERSON *p) {
1008         registry_set_cookie(w, p->guid);
1009 }
1010
1011 static inline void registry_json_header(struct web_client *w, const char *action, const char *status) {
1012         buffer_flush(w->response.data);
1013         w->response.data->contenttype = CT_APPLICATION_JSON;
1014         buffer_sprintf(w->response.data, "{\n\t\"action\": \"%s\",\n\t\"status\": \"%s\",\n\t\"hostname\": \"%s\",\n\t\"machine_guid\": \"%s\"",
1015                                    action, status, registry.hostname, registry.machine_guid);
1016 }
1017
1018 static inline void registry_json_footer(struct web_client *w) {
1019         buffer_strcat(w->response.data, "\n}\n");
1020 }
1021
1022 int registry_request_hello_json(struct web_client *w) {
1023         registry_json_header(w, "hello", REGISTRY_STATUS_OK);
1024
1025         buffer_sprintf(w->response.data, ",\n\t\"registry\": \"%s\"",
1026                                    registry.registry_to_announce);
1027
1028         registry_json_footer(w);
1029         return 200;
1030 }
1031
1032 static inline int registry_json_disabled(struct web_client *w, const char *action) {
1033         registry_json_header(w, action, REGISTRY_STATUS_DISABLED);
1034
1035         buffer_sprintf(w->response.data, ",\n\t\"registry\": \"%s\"",
1036                                    registry.registry_to_announce);
1037
1038         registry_json_footer(w);
1039         return 200;
1040 }
1041
1042 // structure used be the callbacks below
1043 struct registry_json_walk_person_urls_callback {
1044         PERSON *p;
1045         MACHINE *m;
1046         struct web_client *w;
1047         int count;
1048 };
1049
1050 // callback for rendering PERSON_URLs
1051 static inline int registry_json_person_url_callback(void *entry, void *data) {
1052         PERSON_URL *pu = (PERSON_URL *)entry;
1053         struct registry_json_walk_person_urls_callback *c = (struct registry_json_walk_person_urls_callback *)data;
1054         struct web_client *w = c->w;
1055
1056         if(unlikely(c->count++))
1057                 buffer_strcat(w->response.data, ",");
1058
1059         buffer_sprintf(w->response.data, "\n\t\t[ \"%s\", \"%s\", %u000, %u, \"%s\" ]",
1060                                    pu->machine->guid, pu->url->url, pu->last_t, pu->usages, pu->name);
1061
1062         return 1;
1063 }
1064
1065 // callback for rendering MACHINE_URLs
1066 static inline int registry_json_machine_url_callback(void *entry, void *data) {
1067         MACHINE_URL *mu = (MACHINE_URL *)entry;
1068         struct registry_json_walk_person_urls_callback *c = (struct registry_json_walk_person_urls_callback *)data;
1069         struct web_client *w = c->w;
1070         MACHINE *m = c->m;
1071
1072         if(unlikely(c->count++))
1073                 buffer_strcat(w->response.data, ",");
1074
1075         buffer_sprintf(w->response.data, "\n\t\t[ \"%s\", \"%s\", %u000, %u ]",
1076                                    m->guid, mu->url->url, mu->last_t, mu->usages);
1077
1078         return 1;
1079 }
1080
1081
1082 // the main method for registering an access
1083 int registry_request_access_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *name, time_t when) {
1084         if(!registry.enabled)
1085                 return registry_json_disabled(w, "access");
1086
1087         PERSON *p = registry_request_access(person_guid, machine_guid, url, name, when);
1088         if(!p) {
1089                 registry_json_header(w, "access", REGISTRY_STATUS_FAILED);
1090                 registry_json_footer(w);
1091                 return 412;
1092         }
1093
1094         // set the cookie
1095         registry_set_person_cookie(w, p);
1096
1097         // generate the response
1098         registry_json_header(w, "access", REGISTRY_STATUS_OK);
1099
1100         buffer_sprintf(w->response.data, ",\n\t\"person_guid\": \"%s\",\n\t\"urls\": [", p->guid);
1101         struct registry_json_walk_person_urls_callback c = { p, NULL, w, 0 };
1102         dictionary_get_all(p->urls, registry_json_person_url_callback, &c);
1103         buffer_strcat(w->response.data, "\n\t]\n");
1104
1105         registry_json_footer(w);
1106         return 200;
1107 }
1108
1109 // the main method for deleting a URL from a person
1110 int registry_request_delete_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *delete_url, time_t when) {
1111         if(!registry.enabled)
1112                 return registry_json_disabled(w, "delete");
1113
1114         PERSON *p = registry_request_delete(person_guid, machine_guid, url, delete_url, when);
1115         if(!p) {
1116                 registry_json_header(w, "delete", REGISTRY_STATUS_FAILED);
1117                 registry_json_footer(w);
1118                 return 412;
1119         }
1120
1121         // generate the response
1122         registry_json_header(w, "delete", REGISTRY_STATUS_OK);
1123         registry_json_footer(w);
1124         return 200;
1125 }
1126
1127 // the main method for searching the URLs of a netdata
1128 int registry_request_search_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *request_machine, time_t when) {
1129         if(!registry.enabled)
1130                 return registry_json_disabled(w, "search");
1131
1132         MACHINE *m = registry_request_machine(person_guid, machine_guid, url, request_machine, when);
1133         if(!m) {
1134                 registry_json_header(w, "search", REGISTRY_STATUS_FAILED);
1135                 registry_json_footer(w);
1136                 return 404;
1137         }
1138
1139         registry_json_header(w, "search", REGISTRY_STATUS_OK);
1140
1141         buffer_strcat(w->response.data, ",\n\t\"urls\": [");
1142         struct registry_json_walk_person_urls_callback c = { NULL, m, w, 0 };
1143         dictionary_get_all(m->urls, registry_json_machine_url_callback, &c);
1144         buffer_strcat(w->response.data, "\n\t]\n");
1145
1146         registry_json_footer(w);
1147         return 200;
1148 }
1149
1150 // structure used be the callbacks below
1151 struct registry_person_url_callback_verify_machine_exists_data {
1152         MACHINE *m;
1153         int count;
1154 };
1155
1156 int registry_person_url_callback_verify_machine_exists(void *entry, void *data) {
1157         struct registry_person_url_callback_verify_machine_exists_data *d = (struct registry_person_url_callback_verify_machine_exists_data *)data;
1158         PERSON_URL *pu = (PERSON_URL *)entry;
1159         MACHINE *m = d->m;
1160
1161         if(pu->machine == m)
1162                 d->count++;
1163
1164         return 0;
1165 }
1166
1167 // the main method for switching user identity
1168 int registry_request_switch_json(struct web_client *w, char *person_guid, char *machine_guid, char *url, char *new_person_guid, time_t when) {
1169         (void)url;
1170         (void)when;
1171
1172         if(!registry.enabled)
1173                 return registry_json_disabled(w, "switch");
1174
1175         PERSON *op = registry_person_find(person_guid);
1176         if(!op) {
1177                 registry_json_header(w, "switch", REGISTRY_STATUS_FAILED);
1178                 registry_json_footer(w);
1179                 return 430;
1180         }
1181
1182         PERSON *np = registry_person_find(new_person_guid);
1183         if(!np) {
1184                 registry_json_header(w, "switch", REGISTRY_STATUS_FAILED);
1185                 registry_json_footer(w);
1186                 return 431;
1187         }
1188
1189         MACHINE *m = registry_machine_find(machine_guid);
1190         if(!m) {
1191                 registry_json_header(w, "switch", REGISTRY_STATUS_FAILED);
1192                 registry_json_footer(w);
1193                 return 432;
1194         }
1195
1196         struct registry_person_url_callback_verify_machine_exists_data data = { m, 0 };
1197
1198         // verify the old person has access to this machine
1199         dictionary_get_all(op->urls, registry_person_url_callback_verify_machine_exists, &data);
1200         if(!data.count) {
1201                 registry_json_header(w, "switch", REGISTRY_STATUS_FAILED);
1202                 registry_json_footer(w);
1203                 return 433;
1204         }
1205
1206         // verify the new person has access to this machine
1207         data.count = 0;
1208         dictionary_get_all(np->urls, registry_person_url_callback_verify_machine_exists, &data);
1209         if(!data.count) {
1210                 registry_json_header(w, "switch", REGISTRY_STATUS_FAILED);
1211                 registry_json_footer(w);
1212                 return 434;
1213         }
1214
1215         // set the cookie of the new person
1216         // the user just switched identity
1217         registry_set_person_cookie(w, np);
1218
1219         // generate the response
1220         registry_json_header(w, "switch", REGISTRY_STATUS_OK);
1221         buffer_sprintf(w->response.data, ",\n\t\"person_guid\": \"%s\"", np->guid);
1222         registry_json_footer(w);
1223         return 200;
1224 }
1225
1226
1227 // ----------------------------------------------------------------------------
1228 // REGISTRY THIS MACHINE UNIQUE ID
1229
1230 char *registry_get_this_machine_guid(void) {
1231         if(likely(registry.machine_guid[0]))
1232                 return registry.machine_guid;
1233
1234         // read it from disk
1235         int fd = open(registry.machine_guid_filename, O_RDONLY);
1236         if(fd != -1) {
1237                 char buf[36 + 1];
1238                 if(read(fd, buf, 36) != 36)
1239                         error("Failed to read machine GUID from '%s'", registry.machine_guid_filename);
1240                 else {
1241                         buf[36] = '\0';
1242                         if(registry_regenerate_guid(buf, registry.machine_guid) == -1) {
1243                                 error("Failed to validate machine GUID '%s' from '%s'. Ignoring it - this might mean this netdata will appear as duplicate in the registry.",
1244                                           buf, registry.machine_guid_filename);
1245
1246                                 registry.machine_guid[0] = '\0';
1247                         }
1248                 }
1249                 close(fd);
1250         }
1251
1252         // generate a new one?
1253         if(!registry.machine_guid[0]) {
1254                 uuid_t uuid;
1255
1256                 uuid_generate_time(uuid);
1257                 uuid_unparse_lower(uuid, registry.machine_guid);
1258                 registry.machine_guid[36] = '\0';
1259
1260                 // save it
1261                 fd = open(registry.machine_guid_filename, O_WRONLY|O_CREAT|O_TRUNC, 444);
1262                 if(fd == -1)
1263                         fatal("Cannot create unique machine id file '%s'. Please fix this.", registry.machine_guid_filename);
1264
1265                 if(write(fd, registry.machine_guid, 36) != 36)
1266                         fatal("Cannot write the unique machine id file '%s'. Please fix this.", registry.machine_guid_filename);
1267
1268                 close(fd);
1269         }
1270
1271         return registry.machine_guid;
1272 }
1273
1274
1275 // ----------------------------------------------------------------------------
1276 // REGISTRY LOAD/SAVE
1277
1278 int registry_machine_save_url(void *entry, void *file) {
1279         MACHINE_URL *mu = entry;
1280         FILE *fp = file;
1281
1282         debug(D_REGISTRY, "Registry: registry_machine_save_url('%s')", mu->url->url);
1283
1284         int ret = fprintf(fp, "V\t%08x\t%08x\t%08x\t%02x\t%s\n",
1285                         mu->first_t,
1286                         mu->last_t,
1287                         mu->usages,
1288                         mu->flags,
1289                         mu->url->url
1290         );
1291
1292         // error handling is done at registry_save()
1293
1294         return ret;
1295 }
1296
1297 int registry_machine_save(void *entry, void *file) {
1298         MACHINE *m = entry;
1299         FILE *fp = file;
1300
1301         debug(D_REGISTRY, "Registry: registry_machine_save('%s')", m->guid);
1302
1303         int ret = fprintf(fp, "M\t%08x\t%08x\t%08x\t%s\n",
1304                         m->first_t,
1305                         m->last_t,
1306                         m->usages,
1307                         m->guid
1308         );
1309
1310         if(ret >= 0) {
1311                 int ret2 = dictionary_get_all(m->urls, registry_machine_save_url, fp);
1312                 if(ret2 < 0) return ret2;
1313                 ret += ret2;
1314         }
1315
1316         // error handling is done at registry_save()
1317
1318         return ret;
1319 }
1320
1321 static inline int registry_person_save_url(void *entry, void *file) {
1322         PERSON_URL *pu = entry;
1323         FILE *fp = file;
1324
1325         debug(D_REGISTRY, "Registry: registry_person_save_url('%s')", pu->url->url);
1326
1327         int ret = fprintf(fp, "U\t%08x\t%08x\t%08x\t%02x\t%s\t%s\t%s\n",
1328                         pu->first_t,
1329                         pu->last_t,
1330                         pu->usages,
1331                         pu->flags,
1332                         pu->machine->guid,
1333                         pu->name,
1334                         pu->url->url
1335         );
1336
1337         // error handling is done at registry_save()
1338
1339         return ret;
1340 }
1341
1342 static inline int registry_person_save(void *entry, void *file) {
1343         PERSON *p = entry;
1344         FILE *fp = file;
1345
1346         debug(D_REGISTRY, "Registry: registry_person_save('%s')", p->guid);
1347
1348         int ret = fprintf(fp, "P\t%08x\t%08x\t%08x\t%s\n",
1349                         p->first_t,
1350                         p->last_t,
1351                         p->usages,
1352                         p->guid
1353         );
1354
1355         if(ret >= 0) {
1356                 int ret2 = dictionary_get_all(p->urls, registry_person_save_url, fp);
1357                 if (ret2 < 0) return ret2;
1358                 ret += ret2;
1359         }
1360
1361         // error handling is done at registry_save()
1362
1363         return ret;
1364 }
1365
1366 int registry_save(void) {
1367         if(!registry.enabled) return -1;
1368
1369         // make sure the log is not updated
1370         registry_log_lock();
1371
1372         if(unlikely(!registry_should_save_db())) {
1373                 registry_log_unlock();
1374                 return -2;
1375         }
1376
1377         char tmp_filename[FILENAME_MAX + 1];
1378         char old_filename[FILENAME_MAX + 1];
1379
1380         snprintfz(old_filename, FILENAME_MAX, "%s.old", registry.db_filename);
1381         snprintfz(tmp_filename, FILENAME_MAX, "%s.tmp", registry.db_filename);
1382
1383         debug(D_REGISTRY, "Registry: Creating file '%s'", tmp_filename);
1384         FILE *fp = fopen(tmp_filename, "w");
1385         if(!fp) {
1386                 error("Registry: Cannot create file: %s", tmp_filename);
1387                 registry_log_unlock();
1388                 return -1;
1389         }
1390
1391         // dictionary_get_all() has its own locking, so this is safe to do
1392
1393         debug(D_REGISTRY, "Saving all machines");
1394         int bytes1 = dictionary_get_all(registry.machines, registry_machine_save, fp);
1395         if(bytes1 < 0) {
1396                 error("Registry: Cannot save registry machines - return value %d", bytes1);
1397                 fclose(fp);
1398                 registry_log_unlock();
1399                 return bytes1;
1400         }
1401         debug(D_REGISTRY, "Registry: saving machines took %d bytes", bytes1);
1402
1403         debug(D_REGISTRY, "Saving all persons");
1404         int bytes2 = dictionary_get_all(registry.persons, registry_person_save, fp);
1405         if(bytes2 < 0) {
1406                 error("Registry: Cannot save registry persons - return value %d", bytes2);
1407                 fclose(fp);
1408                 registry_log_unlock();
1409                 return bytes2;
1410         }
1411         debug(D_REGISTRY, "Registry: saving persons took %d bytes", bytes2);
1412
1413         // save the totals
1414         fprintf(fp, "T\t%016llx\t%016llx\t%016llx\t%016llx\t%016llx\t%016llx\n",
1415                         registry.persons_count,
1416                         registry.machines_count,
1417                         registry.usages_count + 1, // this is required - it is lost on db rotation
1418                         registry.urls_count,
1419                         registry.persons_urls_count,
1420                         registry.machines_urls_count
1421         );
1422
1423         fclose(fp);
1424
1425         errno = 0;
1426
1427         // remove the .old db
1428         debug(D_REGISTRY, "Registry: Removing old db '%s'", old_filename);
1429         if(unlink(old_filename) == -1 && errno != ENOENT)
1430                 error("Registry: cannot remove old registry file '%s'", old_filename);
1431
1432         // rename the db to .old
1433         debug(D_REGISTRY, "Registry: Link current db '%s' to .old: '%s'", registry.db_filename, old_filename);
1434         if(link(registry.db_filename, old_filename) == -1 && errno != ENOENT)
1435                 error("Registry: cannot move file '%s' to '%s'. Saving registry DB failed!", tmp_filename, registry.db_filename);
1436
1437         else {
1438                 // remove the database (it is saved in .old)
1439                 debug(D_REGISTRY, "Registry: removing db '%s'", registry.db_filename);
1440                 if (unlink(registry.db_filename) == -1 && errno != ENOENT)
1441                         error("Registry: cannot remove old registry file '%s'", registry.db_filename);
1442
1443                 // move the .tmp to make it active
1444                 debug(D_REGISTRY, "Registry: linking tmp db '%s' to active db '%s'", tmp_filename, registry.db_filename);
1445                 if (link(tmp_filename, registry.db_filename) == -1) {
1446                         error("Registry: cannot move file '%s' to '%s'. Saving registry DB failed!", tmp_filename,
1447                                   registry.db_filename);
1448
1449                         // move the .old back
1450                         debug(D_REGISTRY, "Registry: linking old db '%s' to active db '%s'", old_filename, registry.db_filename);
1451                         if(link(old_filename, registry.db_filename) == -1)
1452                                 error("Registry: cannot move file '%s' to '%s'. Recovering the old registry DB failed!", old_filename, registry.db_filename);
1453                 }
1454                 else {
1455                         debug(D_REGISTRY, "Registry: removing tmp db '%s'", tmp_filename);
1456                         if(unlink(tmp_filename) == -1)
1457                                 error("Registry: cannot remove tmp registry file '%s'", tmp_filename);
1458
1459                         // it has been moved successfully
1460                         // discard the current registry log
1461                         registry_log_recreate_nolock();
1462
1463                         registry.log_count = 0;
1464                 }
1465         }
1466
1467         // continue operations
1468         registry_log_unlock();
1469
1470         return -1;
1471 }
1472
1473 static inline size_t registry_load(void) {
1474         char *s, buf[4096 + 1];
1475         PERSON *p = NULL;
1476         MACHINE *m = NULL;
1477         URL *u = NULL;
1478         size_t line = 0;
1479
1480         debug(D_REGISTRY, "Registry: loading active db from: '%s'", registry.db_filename);
1481         FILE *fp = fopen(registry.db_filename, "r");
1482         if(!fp) {
1483                 error("Registry: cannot open registry file: '%s'", registry.db_filename);
1484                 return 0;
1485         }
1486
1487         size_t len = 0;
1488         buf[4096] = '\0';
1489         while((s = fgets_trim_len(buf, 4096, fp, &len))) {
1490                 line++;
1491
1492                 debug(D_REGISTRY, "Registry: read line %zu to length %zu: %s", line, len, s);
1493                 switch(*s) {
1494                         case 'T': // totals
1495                                 if(unlikely(len != 103 || s[1] != '\t' || s[18] != '\t' || s[35] != '\t' || s[52] != '\t' || s[69] != '\t' || s[86] != '\t' || s[103] != '\0')) {
1496                                         error("Registry totals line %zu is wrong (len = %zu).", line, len);
1497                                         continue;
1498                                 }
1499                                 registry.persons_count = strtoull(&s[2], NULL, 16);
1500                                 registry.machines_count = strtoull(&s[19], NULL, 16);
1501                                 registry.usages_count = strtoull(&s[36], NULL, 16);
1502                                 registry.urls_count = strtoull(&s[53], NULL, 16);
1503                                 registry.persons_urls_count = strtoull(&s[70], NULL, 16);
1504                                 registry.machines_urls_count = strtoull(&s[87], NULL, 16);
1505                                 break;
1506
1507                         case 'P': // person
1508                                 m = NULL;
1509                                 // verify it is valid
1510                                 if(unlikely(len != 65 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[65] != '\0')) {
1511                                         error("Registry person line %zu is wrong (len = %zu).", line, len);
1512                                         continue;
1513                                 }
1514
1515                                 s[1] = s[10] = s[19] = s[28] = '\0';
1516                                 p = registry_person_allocate(&s[29], strtoul(&s[2], NULL, 16));
1517                                 p->last_t = strtoul(&s[11], NULL, 16);
1518                                 p->usages = strtoul(&s[20], NULL, 16);
1519                                 debug(D_REGISTRY, "Registry loaded person '%s', first: %u, last: %u, usages: %u", p->guid, p->first_t, p->last_t, p->usages);
1520                                 break;
1521
1522                         case 'M': // machine
1523                                 p = NULL;
1524                                 // verify it is valid
1525                                 if(unlikely(len != 65 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[65] != '\0')) {
1526                                         error("Registry person line %zu is wrong (len = %zu).", line, len);
1527                                         continue;
1528                                 }
1529
1530                                 s[1] = s[10] = s[19] = s[28] = '\0';
1531                                 m = registry_machine_allocate(&s[29], strtoul(&s[2], NULL, 16));
1532                                 m->last_t = strtoul(&s[11], NULL, 16);
1533                                 m->usages = strtoul(&s[20], NULL, 16);
1534                                 debug(D_REGISTRY, "Registry loaded machine '%s', first: %u, last: %u, usages: %u", m->guid, m->first_t, m->last_t, m->usages);
1535                                 break;
1536
1537                         case 'U': // person URL
1538                                 if(unlikely(!p)) {
1539                                         error("Registry: ignoring line %zu, no person loaded: %s", line, s);
1540                                         continue;
1541                                 }
1542
1543                                 // verify it is valid
1544                                 if(len < 69 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[31] != '\t' || s[68] != '\t') {
1545                                         error("Registry person URL line %zu is wrong (len = %zu).", line, len);
1546                                         continue;
1547                                 }
1548
1549                                 s[1] = s[10] = s[19] = s[28] = s[31] = s[68] = '\0';
1550
1551                                 // skip the name to find the url
1552                                 char *url = &s[69];
1553                                 while(*url && *url != '\t') url++;
1554                                 if(!*url) {
1555                                         error("Registry person URL line %zu does not have a url.", line);
1556                                         continue;
1557                                 }
1558                                 *url++ = '\0';
1559
1560                                 u = registry_url_allocate_nolock(url, strlen(url));
1561
1562                                 time_t first_t = strtoul(&s[2], NULL, 16);
1563
1564                                 m = registry_machine_find(&s[32]);
1565                                 if(!m) m = registry_machine_allocate(&s[32], first_t);
1566
1567                                 PERSON_URL *pu = registry_person_url_allocate(p, m, u, &s[69], strlen(&s[69]), first_t);
1568                                 pu->last_t = strtoul(&s[11], NULL, 16);
1569                                 pu->usages = strtoul(&s[20], NULL, 16);
1570                                 pu->flags = strtoul(&s[29], NULL, 16);
1571                                 debug(D_REGISTRY, "Registry loaded person URL '%s' with name '%s' of machine '%s', first: %u, last: %u, usages: %u, flags: %02x", u->url, pu->name, m->guid, pu->first_t, pu->last_t, pu->usages, pu->flags);
1572                                 break;
1573
1574                         case 'V': // machine URL
1575                                 if(unlikely(!m)) {
1576                                         error("Registry: ignoring line %zu, no machine loaded: %s", line, s);
1577                                         continue;
1578                                 }
1579
1580                                 // verify it is valid
1581                                 if(len < 32 || s[1] != '\t' || s[10] != '\t' || s[19] != '\t' || s[28] != '\t' || s[31] != '\t') {
1582                                         error("Registry person URL line %zu is wrong (len = %zu).", line, len);
1583                                         continue;
1584                                 }
1585
1586                                 s[1] = s[10] = s[19] = s[28] = s[31] = '\0';
1587                                 u = registry_url_allocate_nolock(&s[32], strlen(&s[32]));
1588
1589                                 MACHINE_URL *mu = registry_machine_url_allocate(m, u, strtoul(&s[2], NULL, 16));
1590                                 mu->last_t = strtoul(&s[11], NULL, 16);
1591                                 mu->usages = strtoul(&s[20], NULL, 16);
1592                                 mu->flags = strtoul(&s[29], NULL, 16);
1593                                 debug(D_REGISTRY, "Registry loaded machine URL '%s', machine '%s', first: %u, last: %u, usages: %u, flags: %02x", u->url, m->guid, mu->first_t, mu->last_t, mu->usages, mu->flags);
1594                                 break;
1595
1596                         default:
1597                                 error("Registry: ignoring line %zu of filename '%s': %s.", line, registry.db_filename, s);
1598                                 break;
1599                 }
1600         }
1601         fclose(fp);
1602
1603         return line;
1604 }
1605
1606 // ----------------------------------------------------------------------------
1607 // REGISTRY
1608
1609 int registry_init(void) {
1610         char filename[FILENAME_MAX + 1];
1611
1612         // registry enabled?
1613         registry.enabled = config_get_boolean("registry", "enabled", 0);
1614
1615         if(mkdir(VARLIB_DIR, 0755) == -1 && errno != EEXIST)
1616                 error("Cannot create directory '" VARLIB_DIR "'");
1617
1618         // pathnames
1619         registry.pathname = config_get("registry", "registry db directory", VARLIB_DIR "/registry");
1620         if(mkdir(registry.pathname, 0755) == -1 && errno != EEXIST) {
1621                 error("Cannot create directory '%s'. Registry disabled.", registry.pathname);
1622                 registry.enabled = 0;
1623                 return -1;
1624         }
1625
1626         // filenames
1627         snprintfz(filename, FILENAME_MAX, "%s/netdata.public.unique.id", registry.pathname);
1628         registry.machine_guid_filename = config_get("registry", "netdata unique id file", filename);
1629         registry_get_this_machine_guid();
1630
1631         snprintfz(filename, FILENAME_MAX, "%s/registry.db", registry.pathname);
1632         registry.db_filename = config_get("registry", "registry db file", filename);
1633
1634         snprintfz(filename, FILENAME_MAX, "%s/registry-log.db", registry.pathname);
1635         registry.log_filename = config_get("registry", "registry log file", filename);
1636
1637         // configuration options
1638         registry.save_registry_every_entries = config_get_number("registry", "registry save db every new entries", 1000000);
1639         registry.persons_expiration = config_get_number("registry", "registry expire idle persons days", 365) * 86400;
1640         registry.registry_domain = config_get("registry", "registry domain", "");
1641         registry.registry_to_announce = config_get("registry", "registry to announce", "https://registry.my-netdata.io");
1642         registry.hostname = config_get("registry", "registry hostname", config_get("global", "hostname", hostname));
1643         registry.verify_cookies_redirects = config_get_boolean("registry", "verify browser cookies support", 1);
1644
1645         registry.max_url_length = config_get_number("registry", "max URL length", 1024);
1646         if(registry.max_url_length < 10) {
1647                 registry.max_url_length = 10;
1648                 config_set_number("registry", "max URL length", registry.max_url_length);
1649         }
1650
1651         registry.max_name_length = config_get_number("registry", "max URL name length", 50);
1652         if(registry.max_name_length < 10) {
1653                 registry.max_name_length = 10;
1654                 config_set_number("registry", "max URL name length", registry.max_name_length);
1655         }
1656
1657         // initialize entries counters
1658         registry.persons_count = 0;
1659         registry.machines_count = 0;
1660         registry.usages_count = 0;
1661         registry.urls_count = 0;
1662         registry.persons_urls_count = 0;
1663         registry.machines_urls_count = 0;
1664
1665         // initialize memory counters
1666         registry.persons_memory = 0;
1667         registry.machines_memory = 0;
1668         registry.urls_memory = 0;
1669         registry.persons_urls_memory = 0;
1670         registry.machines_urls_memory = 0;
1671
1672         // initialize locks
1673         pthread_mutex_init(&registry.persons_lock, NULL);
1674         pthread_mutex_init(&registry.machines_lock, NULL);
1675         pthread_mutex_init(&registry.urls_lock, NULL);
1676         pthread_mutex_init(&registry.person_urls_lock, NULL);
1677         pthread_mutex_init(&registry.machine_urls_lock, NULL);
1678
1679         // create dictionaries
1680         registry.persons = dictionary_create(DICTIONARY_FLAGS);
1681         registry.machines = dictionary_create(DICTIONARY_FLAGS);
1682         registry.urls = dictionary_create(DICTIONARY_FLAGS);
1683
1684         // load the registry database
1685         if(registry.enabled) {
1686                 registry_log_open_nolock();
1687                 registry_load();
1688                 registry_log_load();
1689         }
1690
1691         return 0;
1692 }
1693
1694 void registry_free(void) {
1695         if(!registry.enabled) return;
1696
1697         // we need to destroy the dictionaries ourselves
1698         // since the dictionaries use memory we allocated
1699
1700         while(registry.persons->values_index.root) {
1701                 PERSON *p = ((NAME_VALUE *)registry.persons->values_index.root)->value;
1702
1703                 // fprintf(stderr, "\nPERSON: '%s', first: %u, last: %u, usages: %u\n", p->guid, p->first_t, p->last_t, p->usages);
1704
1705                 while(p->urls->values_index.root) {
1706                         PERSON_URL *pu = ((NAME_VALUE *)p->urls->values_index.root)->value;
1707
1708                         // fprintf(stderr, "\tURL: '%s', first: %u, last: %u, usages: %u, flags: 0x%02x\n", pu->url->url, pu->first_t, pu->last_t, pu->usages, pu->flags);
1709
1710                         debug(D_REGISTRY, "Registry: deleting url '%s' from person '%s'", pu->url->url, p->guid);
1711                         dictionary_del(p->urls, pu->url->url);
1712
1713                         debug(D_REGISTRY, "Registry: unlinking url '%s' from person", pu->url->url);
1714                         registry_url_unlink_nolock(pu->url);
1715
1716                         debug(D_REGISTRY, "Registry: freeing person url");
1717                         freez(pu);
1718                 }
1719
1720                 debug(D_REGISTRY, "Registry: deleting person '%s' from persons registry", p->guid);
1721                 dictionary_del(registry.persons, p->guid);
1722
1723                 debug(D_REGISTRY, "Registry: destroying URL dictionary of person '%s'", p->guid);
1724                 dictionary_destroy(p->urls);
1725
1726                 debug(D_REGISTRY, "Registry: freeing person '%s'", p->guid);
1727                 freez(p);
1728         }
1729
1730         while(registry.machines->values_index.root) {
1731                 MACHINE *m = ((NAME_VALUE *)registry.machines->values_index.root)->value;
1732
1733                 // fprintf(stderr, "\nMACHINE: '%s', first: %u, last: %u, usages: %u\n", m->guid, m->first_t, m->last_t, m->usages);
1734
1735                 while(m->urls->values_index.root) {
1736                         MACHINE_URL *mu = ((NAME_VALUE *)m->urls->values_index.root)->value;
1737
1738                         // fprintf(stderr, "\tURL: '%s', first: %u, last: %u, usages: %u, flags: 0x%02x\n", mu->url->url, mu->first_t, mu->last_t, mu->usages, mu->flags);
1739
1740                         //debug(D_REGISTRY, "Registry: destroying persons dictionary from url '%s'", mu->url->url);
1741                         //dictionary_destroy(mu->persons);
1742
1743                         debug(D_REGISTRY, "Registry: deleting url '%s' from person '%s'", mu->url->url, m->guid);
1744                         dictionary_del(m->urls, mu->url->url);
1745
1746                         debug(D_REGISTRY, "Registry: unlinking url '%s' from machine", mu->url->url);
1747                         registry_url_unlink_nolock(mu->url);
1748
1749                         debug(D_REGISTRY, "Registry: freeing machine url");
1750                         freez(mu);
1751                 }
1752
1753                 debug(D_REGISTRY, "Registry: deleting machine '%s' from machines registry", m->guid);
1754                 dictionary_del(registry.machines, m->guid);
1755
1756                 debug(D_REGISTRY, "Registry: destroying URL dictionary of machine '%s'", m->guid);
1757                 dictionary_destroy(m->urls);
1758
1759                 debug(D_REGISTRY, "Registry: freeing machine '%s'", m->guid);
1760                 freez(m);
1761         }
1762
1763         // and free the memory of remaining dictionary structures
1764
1765         debug(D_REGISTRY, "Registry: destroying persons dictionary");
1766         dictionary_destroy(registry.persons);
1767
1768         debug(D_REGISTRY, "Registry: destroying machines dictionary");
1769         dictionary_destroy(registry.machines);
1770
1771         debug(D_REGISTRY, "Registry: destroying urls dictionary");
1772         dictionary_destroy(registry.urls);
1773 }
1774
1775 // ----------------------------------------------------------------------------
1776 // STATISTICS
1777
1778 void registry_statistics(void) {
1779         if(!registry.enabled) return;
1780
1781         static RRDSET *sts = NULL, *stc = NULL, *stm = NULL;
1782
1783         if(!sts) sts = rrdset_find("netdata.registry_sessions");
1784         if(!sts) {
1785                 sts = rrdset_create("netdata", "registry_sessions", NULL, "registry", NULL, "NetData Registry Sessions", "session", 131000, rrd_update_every, RRDSET_TYPE_LINE);
1786
1787                 rrddim_add(sts, "sessions",  NULL,  1, 1, RRDDIM_ABSOLUTE);
1788         }
1789         else rrdset_next(sts);
1790
1791         rrddim_set(sts, "sessions", registry.usages_count);
1792         rrdset_done(sts);
1793
1794         // ------------------------------------------------------------------------
1795
1796         if(!stc) stc = rrdset_find("netdata.registry_entries");
1797         if(!stc) {
1798                 stc = rrdset_create("netdata", "registry_entries", NULL, "registry", NULL, "NetData Registry Entries", "entries", 131100, rrd_update_every, RRDSET_TYPE_LINE);
1799
1800                 rrddim_add(stc, "persons",        NULL,  1, 1, RRDDIM_ABSOLUTE);
1801                 rrddim_add(stc, "machines",       NULL,  1, 1, RRDDIM_ABSOLUTE);
1802                 rrddim_add(stc, "urls",           NULL,  1, 1, RRDDIM_ABSOLUTE);
1803                 rrddim_add(stc, "persons_urls",   NULL,  1, 1, RRDDIM_ABSOLUTE);
1804                 rrddim_add(stc, "machines_urls",  NULL,  1, 1, RRDDIM_ABSOLUTE);
1805         }
1806         else rrdset_next(stc);
1807
1808         rrddim_set(stc, "persons",       registry.persons_count);
1809         rrddim_set(stc, "machines",      registry.machines_count);
1810         rrddim_set(stc, "urls",          registry.urls_count);
1811         rrddim_set(stc, "persons_urls",  registry.persons_urls_count);
1812         rrddim_set(stc, "machines_urls", registry.machines_urls_count);
1813         rrdset_done(stc);
1814
1815         // ------------------------------------------------------------------------
1816
1817         if(!stm) stm = rrdset_find("netdata.registry_mem");
1818         if(!stm) {
1819                 stm = rrdset_create("netdata", "registry_mem", NULL, "registry", NULL, "NetData Registry Memory", "KB", 131300, rrd_update_every, RRDSET_TYPE_STACKED);
1820
1821                 rrddim_add(stm, "persons",        NULL,  1, 1024, RRDDIM_ABSOLUTE);
1822                 rrddim_add(stm, "machines",       NULL,  1, 1024, RRDDIM_ABSOLUTE);
1823                 rrddim_add(stm, "urls",           NULL,  1, 1024, RRDDIM_ABSOLUTE);
1824                 rrddim_add(stm, "persons_urls",   NULL,  1, 1024, RRDDIM_ABSOLUTE);
1825                 rrddim_add(stm, "machines_urls",  NULL,  1, 1024, RRDDIM_ABSOLUTE);
1826         }
1827         else rrdset_next(stm);
1828
1829         rrddim_set(stm, "persons",       registry.persons_memory + registry.persons_count * sizeof(NAME_VALUE) + sizeof(DICTIONARY));
1830         rrddim_set(stm, "machines",      registry.machines_memory + registry.machines_count * sizeof(NAME_VALUE) + sizeof(DICTIONARY));
1831         rrddim_set(stm, "urls",          registry.urls_memory + registry.urls_count * sizeof(NAME_VALUE) + sizeof(DICTIONARY));
1832         rrddim_set(stm, "persons_urls",  registry.persons_urls_memory + registry.persons_count * sizeof(DICTIONARY) + registry.persons_urls_count * sizeof(NAME_VALUE));
1833         rrddim_set(stm, "machines_urls", registry.machines_urls_memory + registry.machines_count * sizeof(DICTIONARY) + registry.machines_urls_count * sizeof(NAME_VALUE));
1834         rrdset_done(stm);
1835 }