src/web_client.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <unistd.h>
   5 #include <stdlib.h>
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <netinet/in.h>
   9 #include <arpa/inet.h>
  10 #include <errno.h>
  11 #include <pthread.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14 #include <malloc.h>
  15 #include <pwd.h>
  16 #include <grp.h>
  17 #include <ctype.h>
  18 #include <poll.h>
  19
  20 // TCP_CORK
  21 #include <netinet/tcp.h>
  22
  23 #include "common.h"
  24 #include "log.h"
  25 #include "appconfig.h"
  26 #include "url.h"
  27 #include "web_buffer.h"
  28 #include "web_server.h"
  29 #include "global_statistics.h"
  30 #include "rrd.h"
  31 #include "rrd2json.h"
  32 #include "registry.h"
  33 #include "web_buffer_svg.h"
  34 #include "web_client.h"
  35
  36 #define INITIAL_WEB_DATA_LENGTH 16384
  37 #define WEB_REQUEST_LENGTH 16384
  38 #define TOO_BIG_REQUEST 16384
  39
  40 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
  41 int web_donotrack_comply = 0;
  42
  43 #ifdef NETDATA_WITH_ZLIB
  44 int web_enable_gzip = 1, web_gzip_level = 3, web_gzip_strategy = Z_DEFAULT_STRATEGY;
  45 #endif /* NETDATA_WITH_ZLIB */
  46
  47 extern int netdata_exit;
  48
  49 struct web_client *web_clients = NULL;
  50 unsigned long long web_clients_count = 0;
  51
  52 inline int web_client_crock_socket(struct web_client *w) {
  53 #ifdef TCP_CORK
  54         if(likely(!w->tcp_cork && w->ofd != -1)) {
  55                 w->tcp_cork = 1;
  56                 if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
  57                         error("%llu: failed to enable TCP_CORK on socket.", w->id);
  58                         w->tcp_cork = 0;
  59                         return -1;
  60                 }
  61         }
  62 #endif /* TCP_CORK */
  63
  64         return 0;
  65 }
  66
  67 inline int web_client_uncrock_socket(struct web_client *w) {
  68 #ifdef TCP_CORK
  69         if(likely(w->tcp_cork && w->ofd != -1)) {
  70                 w->tcp_cork = 0;
  71                 if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
  72                         error("%llu: failed to disable TCP_CORK on socket.", w->id);
  73                         w->tcp_cork = 1;
  74                         return -1;
  75                 }
  76         }
  77 #endif /* TCP_CORK */
  78
  79         return 0;
  80 }
  81
  82 struct web_client *web_client_create(int listener)
  83 {
  84         struct web_client *w;
  85
  86         w = calloc(1, sizeof(struct web_client));
  87         if(!w) {
  88                 error("Cannot allocate new web_client memory.");
  89                 return NULL;
  90         }
  91
  92         w->id = ++web_clients_count;
  93         w->mode = WEB_CLIENT_MODE_NORMAL;
  94
  95         {
  96                 struct sockaddr *sadr;
  97                 socklen_t addrlen;
  98
  99                 sadr = (struct sockaddr*) &w->clientaddr;
 100                 addrlen = sizeof(w->clientaddr);
 101
 102                 w->ifd = accept(listener, sadr, &addrlen);
 103                 if (w->ifd == -1) {
 104                         error("%llu: Cannot accept new incoming connection.", w->id);
 105                         free(w);
 106                         return NULL;
 107                 }
 108                 w->ofd = w->ifd;
 109
 110                 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 111                         error("Cannot getnameinfo() on received client connection.");
 112                         strncpyz(w->client_ip,   "UNKNOWN", NI_MAXHOST);
 113                         strncpyz(w->client_port, "UNKNOWN", NI_MAXSERV);
 114                 }
 115                 w->client_ip[NI_MAXHOST]   = '\0';
 116                 w->client_port[NI_MAXSERV] = '\0';
 117
 118                 switch(sadr->sa_family) {
 119                 case AF_INET:
 120                         debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 121                         break;
 122
 123                 case AF_INET6:
 124                         if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
 125                                 strcpy(w->client_ip, &w->client_ip[7]);
 126                                 debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 127                         }
 128                         else
 129                                 debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv6 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 130                         break;
 131
 132                 default:
 133                         debug(D_WEB_CLIENT_ACCESS, "%llu: New UNKNOWN web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 134                         break;
 135                 }
 136
 137                 int flag = 1;
 138                 if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
 139                         error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
 140
 141                 flag = 1;
 142                 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0)
 143                         error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
 144
 145
 146         }
 147
 148         w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
 149         if(unlikely(!w->response.data)) {
 150                 // no need for error log - web_buffer_create already logged the error
 151                 close(w->ifd);
 152                 free(w);
 153                 return NULL;
 154         }
 155
 156         w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 157         if(unlikely(!w->response.header)) {
 158                 // no need for error log - web_buffer_create already logged the error
 159                 buffer_free(w->response.data);
 160                 close(w->ifd);
 161                 free(w);
 162                 return NULL;
 163         }
 164
 165         w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 166         if(unlikely(!w->response.header_output)) {
 167                 // no need for error log - web_buffer_create already logged the error
 168                 buffer_free(w->response.header);
 169                 buffer_free(w->response.data);
 170                 close(w->ifd);
 171                 free(w);
 172                 return NULL;
 173         }
 174
 175         w->origin[0] = '*';
 176         w->wait_receive = 1;
 177
 178         if(web_clients) web_clients->prev = w;
 179         w->next = web_clients;
 180         web_clients = w;
 181
 182         global_statistics.connected_clients++;
 183
 184         return(w);
 185 }
 186
 187 void web_client_reset(struct web_client *w) {
 188         web_client_uncrock_socket(w);
 189
 190         debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 191
 192         if(likely(w->last_url[0])) {
 193                 struct timeval tv;
 194                 gettimeofday(&tv, NULL);
 195
 196                 size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 197                 size_t sent = size;
 198 #ifdef NETDATA_WITH_ZLIB
 199                 if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
 200 #endif
 201
 202                 // --------------------------------------------------------------------
 203                 // global statistics
 204
 205                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 206                         global_statistics_lock();
 207
 208                 global_statistics.web_requests++;
 209                 global_statistics.web_usec += usecdiff(&tv, &w->tv_in);
 210                 global_statistics.bytes_received += w->stats_received_bytes;
 211                 global_statistics.bytes_sent += w->stats_sent_bytes;
 212                 global_statistics.content_size += size;
 213                 global_statistics.compressed_content_size += sent;
 214
 215                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 216                         global_statistics_unlock();
 217
 218                 w->stats_received_bytes = 0;
 219                 w->stats_sent_bytes = 0;
 220
 221
 222                 // --------------------------------------------------------------------
 223                 // access log
 224
 225                 log_access("%llu: (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
 226                                    w->id,
 227                                    sent, size, -((size > 0) ? ((float) (size - sent) / (float) size * 100.0) : 0.0),
 228                                    (float) usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
 229                                    (float) usecdiff(&tv, &w->tv_ready) / 1000.0,
 230                                    (float) usecdiff(&tv, &w->tv_in) / 1000.0,
 231                                    (w->mode == WEB_CLIENT_MODE_FILECOPY) ? "filecopy" : ((w->mode == WEB_CLIENT_MODE_OPTIONS)
 232                                                                                                                                                  ? "options" : "data"),
 233                                    w->response.code,
 234                                    w->last_url
 235                 );
 236         }
 237
 238         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
 239                 if(w->ifd != w->ofd) {
 240                         debug(D_WEB_CLIENT, "%llu: Closing filecopy input file descriptor %d.", w->id, w->ifd);
 241                         if(w->ifd != -1) close(w->ifd);
 242                         w->ifd = w->ofd;
 243                 }
 244         }
 245
 246         w->last_url[0] = '\0';
 247         w->cookie1[0] = '\0';
 248         w->cookie2[0] = '\0';
 249         w->origin[0] = '*';
 250         w->origin[1] = '\0';
 251
 252         w->mode = WEB_CLIENT_MODE_NORMAL;
 253
 254         w->tcp_cork = 0;
 255         w->donottrack = 0;
 256         w->tracking_required = 0;
 257         w->keepalive = 0;
 258         w->decoded_url[0] = '\0';
 259
 260         buffer_reset(w->response.header_output);
 261         buffer_reset(w->response.header);
 262         buffer_reset(w->response.data);
 263         w->response.rlen = 0;
 264         w->response.sent = 0;
 265         w->response.code = 0;
 266
 267         w->wait_receive = 1;
 268         w->wait_send = 0;
 269
 270         w->response.zoutput = 0;
 271
 272         // if we had enabled compression, release it
 273 #ifdef NETDATA_WITH_ZLIB
 274         if(w->response.zinitialized) {
 275                 debug(D_DEFLATE, "%llu: Freeing compression resources.", w->id);
 276                 deflateEnd(&w->response.zstream);
 277                 w->response.zsent = 0;
 278                 w->response.zhave = 0;
 279                 w->response.zstream.avail_in = 0;
 280                 w->response.zstream.avail_out = 0;
 281                 w->response.zstream.total_in = 0;
 282                 w->response.zstream.total_out = 0;
 283                 w->response.zinitialized = 0;
 284         }
 285 #endif // NETDATA_WITH_ZLIB
 286 }
 287
 288 struct web_client *web_client_free(struct web_client *w) {
 289         web_client_reset(w);
 290
 291         struct web_client *n = w->next;
 292         if(w == web_clients) web_clients = n;
 293
 294         debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 295
 296         if(w->prev)     w->prev->next = w->next;
 297         if(w->next) w->next->prev = w->prev;
 298         if(w->response.header_output) buffer_free(w->response.header_output);
 299         if(w->response.header) buffer_free(w->response.header);
 300         if(w->response.data) buffer_free(w->response.data);
 301         if(w->ifd != -1) close(w->ifd);
 302         if(w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
 303         free(w);
 304
 305         global_statistics.connected_clients--;
 306
 307         return(n);
 308 }
 309
 310 uid_t web_files_uid(void) {
 311         static char *web_owner = NULL;
 312         static uid_t owner_uid = 0;
 313
 314         if(unlikely(!web_owner)) {
 315                 web_owner = config_get("global", "web files owner", config_get("global", "run as user", ""));
 316                 if(!web_owner || !*web_owner)
 317                         owner_uid = geteuid();
 318                 else {
 319                         // getpwnam() is not thread safe,
 320                         // but we have called this function once
 321                         // while single threaded
 322                         struct passwd *pw = getpwnam(web_owner);
 323                         if(!pw) {
 324                                 error("User '%s' is not present. Ignoring option.", web_owner);
 325                                 owner_uid = geteuid();
 326                         }
 327                         else {
 328                                 debug(D_WEB_CLIENT, "Web files owner set to %s.", web_owner);
 329                                 owner_uid = pw->pw_uid;
 330                         }
 331                 }
 332         }
 333
 334         return(owner_uid);
 335 }
 336
 337 gid_t web_files_gid(void) {
 338         static char *web_group = NULL;
 339         static gid_t owner_gid = 0;
 340
 341         if(unlikely(!web_group)) {
 342                 web_group = config_get("global", "web files group", config_get("global", "web files owner", ""));
 343                 if(!web_group || !*web_group)
 344                         owner_gid = getegid();
 345                 else {
 346                         // getgrnam() is not thread safe,
 347                         // but we have called this function once
 348                         // while single threaded
 349                         struct group *gr = getgrnam(web_group);
 350                         if(!gr) {
 351                                 error("Group '%s' is not present. Ignoring option.", web_group);
 352                                 owner_gid = getegid();
 353                         }
 354                         else {
 355                                 debug(D_WEB_CLIENT, "Web files group set to %s.", web_group);
 356                                 owner_gid = gr->gr_gid;
 357                         }
 358                 }
 359         }
 360
 361         return(owner_gid);
 362 }
 363
 364 int mysendfile(struct web_client *w, char *filename)
 365 {
 366         static char *web_dir = NULL;
 367
 368         // initialize our static data
 369         if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
 370
 371         debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
 372
 373         // skip leading slashes
 374         while (*filename == '/') filename++;
 375
 376         // if the filename contain known paths, skip them
 377         if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE) + 1];
 378
 379         char *s;
 380         for(s = filename; *s ;s++) {
 381                 if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
 382                         debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 383                         buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
 384                         return 400;
 385                 }
 386         }
 387
 388         // if the filename contains a .. refuse to serve it
 389         if(strstr(filename, "..") != 0) {
 390                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 391                 buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
 392                 return 400;
 393         }
 394
 395         // access the file
 396         char webfilename[FILENAME_MAX + 1];
 397         snprintfz(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
 398
 399         // check if the file exists
 400         struct stat stat;
 401         if(lstat(webfilename, &stat) != 0) {
 402                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
 403                 buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
 404                 return 404;
 405         }
 406
 407         // check if the file is owned by expected user
 408         if(stat.st_uid != web_files_uid()) {
 409                 error("%llu: File '%s' is owned by user %d (expected user %d). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
 410                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 411                 return 403;
 412         }
 413
 414         // check if the file is owned by expected group
 415         if(stat.st_gid != web_files_gid()) {
 416                 error("%llu: File '%s' is owned by group %d (expected group %d). Access Denied.", w->id, webfilename, stat.st_gid, web_files_gid());
 417                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 418                 return 403;
 419         }
 420
 421         if((stat.st_mode & S_IFMT) == S_IFDIR) {
 422                 snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
 423                 return mysendfile(w, webfilename);
 424         }
 425
 426         if((stat.st_mode & S_IFMT) != S_IFREG) {
 427                 error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
 428                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 429                 return 403;
 430         }
 431
 432         // open the file
 433         w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
 434         if(w->ifd == -1) {
 435                 w->ifd = w->ofd;
 436
 437                 if(errno == EBUSY || errno == EAGAIN) {
 438                         error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
 439                         buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
 440                         buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
 441                         return 307;
 442                 }
 443                 else {
 444                         error("%llu: Cannot open file '%s'.", w->id, webfilename);
 445                         buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
 446                         return 404;
 447                 }
 448         }
 449
 450         // pick a Content-Type for the file
 451                  if(strstr(filename, ".html") != NULL)  w->response.data->contenttype = CT_TEXT_HTML;
 452         else if(strstr(filename, ".js")   != NULL)      w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 453         else if(strstr(filename, ".css")  != NULL)      w->response.data->contenttype = CT_TEXT_CSS;
 454         else if(strstr(filename, ".xml")  != NULL)      w->response.data->contenttype = CT_TEXT_XML;
 455         else if(strstr(filename, ".xsl")  != NULL)      w->response.data->contenttype = CT_TEXT_XSL;
 456         else if(strstr(filename, ".txt")  != NULL)  w->response.data->contenttype = CT_TEXT_PLAIN;
 457         else if(strstr(filename, ".svg")  != NULL)  w->response.data->contenttype = CT_IMAGE_SVG_XML;
 458         else if(strstr(filename, ".ttf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
 459         else if(strstr(filename, ".otf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
 460         else if(strstr(filename, ".woff2")!= NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF2;
 461         else if(strstr(filename, ".woff") != NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF;
 462         else if(strstr(filename, ".eot")  != NULL)  w->response.data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
 463         else if(strstr(filename, ".png")  != NULL)  w->response.data->contenttype = CT_IMAGE_PNG;
 464         else if(strstr(filename, ".jpg")  != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 465         else if(strstr(filename, ".jpeg") != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 466         else if(strstr(filename, ".gif")  != NULL)  w->response.data->contenttype = CT_IMAGE_GIF;
 467         else if(strstr(filename, ".bmp")  != NULL)  w->response.data->contenttype = CT_IMAGE_BMP;
 468         else if(strstr(filename, ".ico")  != NULL)  w->response.data->contenttype = CT_IMAGE_XICON;
 469         else if(strstr(filename, ".icns") != NULL)  w->response.data->contenttype = CT_IMAGE_ICNS;
 470         else w->response.data->contenttype = CT_APPLICATION_OCTET_STREAM;
 471
 472         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending file '%s' (%ld bytes, ifd %d, ofd %d).", w->id, webfilename, stat.st_size, w->ifd, w->ofd);
 473
 474         w->mode = WEB_CLIENT_MODE_FILECOPY;
 475         w->wait_receive = 1;
 476         w->wait_send = 0;
 477         buffer_flush(w->response.data);
 478         w->response.rlen = stat.st_size;
 479         w->response.data->date = stat.st_mtim.tv_sec;
 480
 481         return 200;
 482 }
 483
 484
 485 #ifdef NETDATA_WITH_ZLIB
 486 void web_client_enable_deflate(struct web_client *w, int gzip) {
 487         if(unlikely(w->response.zinitialized)) {
 488                 error("%llu: Compression has already be initialized for this client.", w->id);
 489                 return;
 490         }
 491
 492         if(unlikely(w->response.sent)) {
 493                 error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
 494                 return;
 495         }
 496
 497         w->response.zstream.zalloc = Z_NULL;
 498         w->response.zstream.zfree = Z_NULL;
 499         w->response.zstream.opaque = Z_NULL;
 500
 501         w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
 502         w->response.zstream.avail_in = 0;
 503         w->response.zstream.total_in = 0;
 504
 505         w->response.zstream.next_out = w->response.zbuffer;
 506         w->response.zstream.avail_out = 0;
 507         w->response.zstream.total_out = 0;
 508
 509         w->response.zstream.zalloc = Z_NULL;
 510         w->response.zstream.zfree = Z_NULL;
 511         w->response.zstream.opaque = Z_NULL;
 512
 513 //      if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 514 //              error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 515 //              return;
 516 //      }
 517
 518         // Select GZIP compression: windowbits = 15 + 16 = 31
 519         if(deflateInit2(&w->response.zstream, web_gzip_level, Z_DEFLATED, 15 + ((gzip)?16:0), 8, web_gzip_strategy) != Z_OK) {
 520                 error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 521                 return;
 522         }
 523
 524         w->response.zsent = 0;
 525         w->response.zoutput = 1;
 526         w->response.zinitialized = 1;
 527
 528         debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
 529 }
 530 #endif // NETDATA_WITH_ZLIB
 531
 532 uint32_t web_client_api_request_v1_data_options(char *o)
 533 {
 534         uint32_t ret = 0x00000000;
 535         char *tok;
 536
 537         while(o && *o && (tok = mystrsep(&o, ", |"))) {
 538                 if(!*tok) continue;
 539
 540                 if(!strcmp(tok, "nonzero"))
 541                         ret |= RRDR_OPTION_NONZERO;
 542                 else if(!strcmp(tok, "flip") || !strcmp(tok, "reversed") || !strcmp(tok, "reverse"))
 543                         ret |= RRDR_OPTION_REVERSED;
 544                 else if(!strcmp(tok, "jsonwrap"))
 545                         ret |= RRDR_OPTION_JSON_WRAP;
 546                 else if(!strcmp(tok, "min2max"))
 547                         ret |= RRDR_OPTION_MIN2MAX;
 548                 else if(!strcmp(tok, "ms") || !strcmp(tok, "milliseconds"))
 549                         ret |= RRDR_OPTION_MILLISECONDS;
 550                 else if(!strcmp(tok, "abs") || !strcmp(tok, "absolute") || !strcmp(tok, "absolute_sum") || !strcmp(tok, "absolute-sum"))
 551                         ret |= RRDR_OPTION_ABSOLUTE;
 552                 else if(!strcmp(tok, "seconds"))
 553                         ret |= RRDR_OPTION_SECONDS;
 554                 else if(!strcmp(tok, "null2zero"))
 555                         ret |= RRDR_OPTION_NULL2ZERO;
 556                 else if(!strcmp(tok, "objectrows"))
 557                         ret |= RRDR_OPTION_OBJECTSROWS;
 558                 else if(!strcmp(tok, "google_json"))
 559                         ret |= RRDR_OPTION_GOOGLE_JSON;
 560                 else if(!strcmp(tok, "percentage"))
 561                         ret |= RRDR_OPTION_PERCENTAGE;
 562         }
 563
 564         return ret;
 565 }
 566
 567 uint32_t web_client_api_request_v1_data_format(char *name)
 568 {
 569         if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
 570                 return DATASOURCE_DATATABLE_JSON;
 571
 572         else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
 573                 return DATASOURCE_DATATABLE_JSONP;
 574
 575         else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
 576                 return DATASOURCE_JSON;
 577
 578         else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
 579                 return DATASOURCE_JSONP;
 580
 581         else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
 582                 return DATASOURCE_SSV;
 583
 584         else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
 585                 return DATASOURCE_CSV;
 586
 587         else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
 588                 return DATASOURCE_TSV;
 589
 590         else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
 591                 return DATASOURCE_HTML;
 592
 593         else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
 594                 return DATASOURCE_JS_ARRAY;
 595
 596         else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
 597                 return DATASOURCE_SSV_COMMA;
 598
 599         else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
 600                 return DATASOURCE_CSV_JSON_ARRAY;
 601
 602         return DATASOURCE_JSON;
 603 }
 604
 605 uint32_t web_client_api_request_v1_data_google_format(char *name)
 606 {
 607         if(!strcmp(name, "json"))
 608                 return DATASOURCE_DATATABLE_JSONP;
 609
 610         else if(!strcmp(name, "html"))
 611                 return DATASOURCE_HTML;
 612
 613         else if(!strcmp(name, "csv"))
 614                 return DATASOURCE_CSV;
 615
 616         else if(!strcmp(name, "tsv-excel"))
 617                 return DATASOURCE_TSV;
 618
 619         return DATASOURCE_JSON;
 620 }
 621
 622 int web_client_api_request_v1_data_group(char *name)
 623 {
 624         if(!strcmp(name, "max"))
 625                 return GROUP_MAX;
 626
 627         else if(!strcmp(name, "average"))
 628                 return GROUP_AVERAGE;
 629
 630         return GROUP_MAX;
 631 }
 632
 633 int web_client_api_request_v1_charts(struct web_client *w, char *url)
 634 {
 635         if(url) { ; }
 636
 637         buffer_flush(w->response.data);
 638         w->response.data->contenttype = CT_APPLICATION_JSON;
 639         rrd_stats_api_v1_charts(w->response.data);
 640         return 200;
 641 }
 642
 643 int web_client_api_request_v1_chart(struct web_client *w, char *url)
 644 {
 645         int ret = 400;
 646         char *chart = NULL;
 647
 648         buffer_flush(w->response.data);
 649
 650         while(url) {
 651                 char *value = mystrsep(&url, "?&[]");
 652                 if(!value || !*value) continue;
 653
 654                 char *name = mystrsep(&value, "=");
 655                 if(!name || !*name) continue;
 656                 if(!value || !*value) continue;
 657
 658                 // name and value are now the parameters
 659                 // they are not null and not empty
 660
 661                 if(!strcmp(name, "chart")) chart = value;
 662                 //else {
 663                 ///     buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
 664                 //      goto cleanup;
 665                 //}
 666         }
 667
 668         if(!chart || !*chart) {
 669                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 670                 goto cleanup;
 671         }
 672
 673         RRDSET *st = rrdset_find(chart);
 674         if(!st) st = rrdset_find_byname(chart);
 675         if(!st) {
 676                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 677                 ret = 404;
 678                 goto cleanup;
 679         }
 680
 681         w->response.data->contenttype = CT_APPLICATION_JSON;
 682         rrd_stats_api_v1_chart(st, w->response.data);
 683         return 200;
 684
 685 cleanup:
 686         return ret;
 687 }
 688
 689 int web_client_api_v1_badge(struct web_client *w, char *url) {
 690         // chart
 691         // dimensions
 692         // before
 693         // after
 694         // points
 695
 696         int ret = 400;
 697         buffer_flush(w->response.data);
 698
 699         BUFFER *dimensions = NULL;
 700
 701         const char *chart = NULL
 702                         , *before_str = NULL
 703                         , *after_str = NULL
 704                         , *points_str = NULL
 705                         , *multiply_str = NULL
 706                         , *divide_str = NULL
 707                         , *label = NULL
 708                         , *units = NULL
 709                         , *label_color = NULL
 710                         , *value_color = NULL;
 711
 712         int group = GROUP_MAX;
 713         uint32_t format = DATASOURCE_JSON;
 714         uint32_t options = 0x00000000;
 715
 716         while(url) {
 717                 char *value = mystrsep(&url, "/?&[]");
 718                 if(!value || !*value) continue;
 719
 720                 char *name = mystrsep(&value, "=");
 721                 if(!name || !*name) continue;
 722                 if(!value || !*value) continue;
 723
 724                 debug(D_WEB_CLIENT, "%llu: API v1 badge.svg query param '%s' with value '%s'", w->id, name, value);
 725
 726                 // name and value are now the parameters
 727                 // they are not null and not empty
 728
 729                 if(!strcmp(name, "chart")) chart = value;
 730                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 731                         if(!dimensions) dimensions = buffer_create(strlen(value));
 732                         if(dimensions) {
 733                                 buffer_strcat(dimensions, "|");
 734                                 buffer_strcat(dimensions, value);
 735                         }
 736                 }
 737                 else if(!strcmp(name, "after")) after_str = value;
 738                 else if(!strcmp(name, "before")) before_str = value;
 739                 else if(!strcmp(name, "points")) points_str = value;
 740                 else if(!strcmp(name, "group")) {
 741                         group = web_client_api_request_v1_data_group(value);
 742                 }
 743                 else if(!strcmp(name, "format")) {
 744                         format = web_client_api_request_v1_data_format(value);
 745                 }
 746                 else if(!strcmp(name, "options")) {
 747                         options |= web_client_api_request_v1_data_options(value);
 748                 }
 749                 else if(!strcmp(name, "label")) label = value;
 750                 else if(!strcmp(name, "units")) units = value;
 751                 else if(!strcmp(name, "label_color")) label_color = value;
 752                 else if(!strcmp(name, "value_color")) value_color = value;
 753                 else if(!strcmp(name, "multiply")) multiply_str = value;
 754                 else if(!strcmp(name, "divide")) divide_str = value;
 755         }
 756
 757         if(!chart || !*chart) {
 758                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 759                 goto cleanup;
 760         }
 761
 762         RRDSET *st = rrdset_find(chart);
 763         if(!st) st = rrdset_find_byname(chart);
 764         if(!st) {
 765                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 766                 ret = 404;
 767                 goto cleanup;
 768         }
 769
 770         long long multiply = (multiply_str && *multiply_str)?atol(multiply_str):1;
 771         long long divide   = (divide_str   && *divide_str  )?atol(divide_str):1;
 772         long long before   = (before_str   && *before_str  )?atol(before_str):0;
 773         long long after    = (after_str    && *after_str   )?atol(after_str):0;
 774         int       points   = (points_str   && *points_str  )?atoi(points_str):0;
 775
 776         if(!label) {
 777                 if(dimensions) {
 778                         const char *dim = buffer_tostring(dimensions);
 779                         if(*dim == '|') dim++;
 780                         label = dim;
 781                 }
 782                 else
 783                         label = st->name;
 784         }
 785         if(!units) {
 786                 if(options & RRDR_OPTION_PERCENTAGE)
 787                         units="%";
 788                 else
 789                         units = st->units;
 790         }
 791
 792         debug(D_WEB_CLIENT, "%llu: API command 'badge.svg' for chart '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%u', format '%u', options '0x%08x'"
 793                         , w->id
 794                         , chart
 795                         , (dimensions)?buffer_tostring(dimensions):""
 796                         , after
 797                         , before
 798                         , points
 799                         , group
 800                         , format
 801                         , options
 802                         );
 803
 804         time_t latest_timestamp = 0;
 805         int value_is_null = 1;
 806         calculated_number n = 0;
 807         ret = rrd2value(st, w->response.data, &n, dimensions, points, after, before, group, options, &latest_timestamp, &value_is_null);
 808         buffer_svg(w->response.data, label, n * multiply / divide, units, label_color, value_color, value_is_null);
 809         return ret;
 810
 811 cleanup:
 812         if(dimensions) buffer_free(dimensions);
 813         return ret;
 814 }
 815
 816 // returns the HTTP code
 817 int web_client_api_request_v1_data(struct web_client *w, char *url)
 818 {
 819         debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
 820
 821         int ret = 400;
 822         BUFFER *dimensions = NULL;
 823
 824         buffer_flush(w->response.data);
 825
 826         char    *google_version = "0.6",
 827                         *google_reqId = "0",
 828                         *google_sig = "0",
 829                         *google_out = "json",
 830                         *responseHandler = NULL,
 831                         *outFileName = NULL;
 832
 833         time_t last_timestamp_in_data = 0, google_timestamp = 0;
 834
 835         char *chart = NULL
 836                         , *before_str = NULL
 837                         , *after_str = NULL
 838                         , *points_str = NULL;
 839
 840         int group = GROUP_MAX;
 841         uint32_t format = DATASOURCE_JSON;
 842         uint32_t options = 0x00000000;
 843
 844         while(url) {
 845                 char *value = mystrsep(&url, "?&[]");
 846                 if(!value || !*value) continue;
 847
 848                 char *name = mystrsep(&value, "=");
 849                 if(!name || !*name) continue;
 850                 if(!value || !*value) continue;
 851
 852                 debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
 853
 854                 // name and value are now the parameters
 855                 // they are not null and not empty
 856
 857                 if(!strcmp(name, "chart")) chart = value;
 858                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 859                         if(!dimensions) dimensions = buffer_create(strlen(value));
 860                         if(dimensions) {
 861                                 buffer_strcat(dimensions, "|");
 862                                 buffer_strcat(dimensions, value);
 863                         }
 864                 }
 865                 else if(!strcmp(name, "after")) after_str = value;
 866                 else if(!strcmp(name, "before")) before_str = value;
 867                 else if(!strcmp(name, "points")) points_str = value;
 868                 else if(!strcmp(name, "group")) {
 869                         group = web_client_api_request_v1_data_group(value);
 870                 }
 871                 else if(!strcmp(name, "format")) {
 872                         format = web_client_api_request_v1_data_format(value);
 873                 }
 874                 else if(!strcmp(name, "options")) {
 875                         options |= web_client_api_request_v1_data_options(value);
 876                 }
 877                 else if(!strcmp(name, "callback")) {
 878                         responseHandler = value;
 879                 }
 880                 else if(!strcmp(name, "filename")) {
 881                         outFileName = value;
 882                 }
 883                 else if(!strcmp(name, "tqx")) {
 884                         // parse Google Visualization API options
 885                         // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
 886                         char *tqx_name, *tqx_value;
 887
 888                         while(value) {
 889                                 tqx_value = mystrsep(&value, ";");
 890                                 if(!tqx_value || !*tqx_value) continue;
 891
 892                                 tqx_name = mystrsep(&tqx_value, ":");
 893                                 if(!tqx_name || !*tqx_name) continue;
 894                                 if(!tqx_value || !*tqx_value) continue;
 895
 896                                 if(!strcmp(tqx_name, "version"))
 897                                         google_version = tqx_value;
 898                                 else if(!strcmp(tqx_name, "reqId"))
 899                                         google_reqId = tqx_value;
 900                                 else if(!strcmp(tqx_name, "sig")) {
 901                                         google_sig = tqx_value;
 902                                         google_timestamp = strtoul(google_sig, NULL, 0);
 903                                 }
 904                                 else if(!strcmp(tqx_name, "out")) {
 905                                         google_out = tqx_value;
 906                                         format = web_client_api_request_v1_data_google_format(google_out);
 907                                 }
 908                                 else if(!strcmp(tqx_name, "responseHandler"))
 909                                         responseHandler = tqx_value;
 910                                 else if(!strcmp(tqx_name, "outFileName"))
 911                                         outFileName = tqx_value;
 912                         }
 913                 }
 914         }
 915
 916         if(!chart || !*chart) {
 917                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 918                 goto cleanup;
 919         }
 920
 921         RRDSET *st = rrdset_find(chart);
 922         if(!st) st = rrdset_find_byname(chart);
 923         if(!st) {
 924                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 925                 ret = 404;
 926                 goto cleanup;
 927         }
 928
 929         long long before = (before_str && *before_str)?atol(before_str):0;
 930         long long after  = (after_str  && *after_str) ?atol(after_str):0;
 931         int       points = (points_str && *points_str)?atoi(points_str):0;
 932
 933         debug(D_WEB_CLIENT, "%llu: API command 'data' for chart '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%u', format '%u', options '0x%08x'"
 934                         , w->id
 935                         , chart
 936                         , (dimensions)?buffer_tostring(dimensions):""
 937                         , after
 938                         , before
 939                         , points
 940                         , group
 941                         , format
 942                         , options
 943                         );
 944
 945         if(outFileName && *outFileName) {
 946                 buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
 947                 debug(D_WEB_CLIENT, "%llu: generating outfilename header: '%s'", w->id, outFileName);
 948         }
 949
 950         if(format == DATASOURCE_DATATABLE_JSONP) {
 951                 if(responseHandler == NULL)
 952                         responseHandler = "google.visualization.Query.setResponse";
 953
 954                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 955                                 w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
 956                         );
 957
 958                 buffer_sprintf(w->response.data,
 959                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 960                         responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
 961         }
 962         else if(format == DATASOURCE_JSONP) {
 963                 if(responseHandler == NULL)
 964                         responseHandler = "callback";
 965
 966                 buffer_strcat(w->response.data, responseHandler);
 967                 buffer_strcat(w->response.data, "(");
 968         }
 969
 970         ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
 971
 972         if(format == DATASOURCE_DATATABLE_JSONP) {
 973                 if(google_timestamp < last_timestamp_in_data)
 974                         buffer_strcat(w->response.data, "});");
 975
 976                 else {
 977                         // the client already has the latest data
 978                         buffer_flush(w->response.data);
 979                         buffer_sprintf(w->response.data,
 980                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
 981                                 responseHandler, google_version, google_reqId);
 982                 }
 983         }
 984         else if(format == DATASOURCE_JSONP)
 985                 buffer_strcat(w->response.data, ");");
 986
 987 cleanup:
 988         if(dimensions) buffer_free(dimensions);
 989         return ret;
 990 }
 991
 992 int web_client_api_request_v1_registry(struct web_client *w, char *url)
 993 {
 994         static uint32_t hash_action = 0, hash_access = 0, hash_hello = 0, hash_delete = 0, hash_search = 0,
 995                         hash_switch = 0, hash_machine = 0, hash_url = 0, hash_name = 0, hash_delete_url = 0, hash_for = 0,
 996                         hash_to = 0 /*, hash_redirects = 0 */;
 997
 998         if(unlikely(!hash_action)) {
 999                 hash_action = simple_hash("action");
1000                 hash_access = simple_hash("access");
1001                 hash_hello = simple_hash("hello");
1002                 hash_delete = simple_hash("delete");
1003                 hash_search = simple_hash("search");
1004                 hash_switch = simple_hash("switch");
1005                 hash_machine = simple_hash("machine");
1006                 hash_url = simple_hash("url");
1007                 hash_name = simple_hash("name");
1008                 hash_delete_url = simple_hash("delete_url");
1009                 hash_for = simple_hash("for");
1010                 hash_to = simple_hash("to");
1011 /*
1012                 hash_redirects = simple_hash("redirects");
1013 */
1014         }
1015
1016         char person_guid[36 + 1] = "";
1017
1018         debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
1019
1020         // FIXME
1021         // The browser may send multiple cookies with our id
1022
1023         char *cookie = strstr(w->response.data->buffer, NETDATA_REGISTRY_COOKIE_NAME "=");
1024         if(cookie)
1025                 strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME)], 36);
1026
1027         char action = '\0';
1028         char *machine_guid = NULL,
1029                         *machine_url = NULL,
1030                         *url_name = NULL,
1031                         *search_machine_guid = NULL,
1032                         *delete_url = NULL,
1033                         *to_person_guid = NULL;
1034 /*
1035         int redirects = 0;
1036 */
1037
1038         while(url) {
1039                 char *value = mystrsep(&url, "?&[]");
1040                 if (!value || !*value) continue;
1041
1042                 char *name = mystrsep(&value, "=");
1043                 if (!name || !*name) continue;
1044                 if (!value || !*value) continue;
1045
1046                 debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
1047
1048                 uint32_t hash = simple_hash(name);
1049
1050                 if(hash == hash_action && !strcmp(name, "action")) {
1051                         uint32_t vhash = simple_hash(value);
1052
1053                         if(vhash == hash_access && !strcmp(value, "access")) action = 'A';
1054                         else if(vhash == hash_hello && !strcmp(value, "hello")) action = 'H';
1055                         else if(vhash == hash_delete && !strcmp(value, "delete")) action = 'D';
1056                         else if(vhash == hash_search && !strcmp(value, "search")) action = 'S';
1057                         else if(vhash == hash_switch && !strcmp(value, "switch")) action = 'W';
1058 #ifdef NETDATA_INTERNAL_CHECKS
1059             else error("unknown registry action '%s'", value);
1060 #endif /* NETDATA_INTERNAL_CHECKS */
1061                 }
1062 /*
1063                 else if(hash == hash_redirects && !strcmp(name, "redirects"))
1064                         redirects = atoi(value);
1065 */
1066                 else if(hash == hash_machine && !strcmp(name, "machine"))
1067                         machine_guid = value;
1068
1069                 else if(hash == hash_url && !strcmp(name, "url"))
1070                         machine_url = value;
1071
1072                 else if(action == 'A') {
1073                         if(hash == hash_name && !strcmp(name, "name"))
1074                                 url_name = value;
1075                 }
1076                 else if(action == 'D') {
1077                         if(hash == hash_delete_url && !strcmp(name, "delete_url"))
1078                                 delete_url = value;
1079                 }
1080                 else if(action == 'S') {
1081                         if(hash == hash_for && !strcmp(name, "for"))
1082                                 search_machine_guid = value;
1083                 }
1084                 else if(action == 'W') {
1085                         if(hash == hash_to && !strcmp(name, "to"))
1086                                 to_person_guid = value;
1087                 }
1088 #ifdef NETDATA_INTERNAL_CHECKS
1089                 else error("unused registry URL parameter '%s' with value '%s'", name, value);
1090 #endif /* NETDATA_INTERNAL_CHECKS */
1091         }
1092
1093         if(web_donotrack_comply && w->donottrack) {
1094                 buffer_flush(w->response.data);
1095                 buffer_sprintf(w->response.data, "Your web browser is sending 'DNT: 1' (Do Not Track). The registry requires persistent cookies on your browser to work.");
1096                 return 400;
1097         }
1098
1099         if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
1100                 buffer_flush(w->response.data);
1101                 buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
1102                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
1103                 return 400;
1104         }
1105         else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
1106                 buffer_flush(w->response.data);
1107                 buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
1108                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
1109                 return 400;
1110         }
1111         else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
1112                 buffer_flush(w->response.data);
1113                 buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
1114                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
1115                 return 400;
1116         }
1117         else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
1118                 buffer_flush(w->response.data);
1119                 buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
1120                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
1121                 return 400;
1122         }
1123
1124         switch(action) {
1125                 case 'A':
1126                         w->tracking_required = 1;
1127                         if(registry_verify_cookies_redirects() > 0 && (!cookie || !person_guid[0])) {
1128                                 buffer_flush(w->response.data);
1129
1130                                 registry_set_cookie(w, "give-me-back-this-cookie-please");
1131                                 w->response.data->contenttype = CT_APPLICATION_JSON;
1132                                 buffer_sprintf(w->response.data, "{ \"status\": \"redirect\", \"registry\": \"%s\" }", registry_to_announce());
1133                                 return 200;
1134
1135 /*
1136  * it seems that web browsers are ignoring 307 (Moved Temporarily)
1137  * under certain conditions, when using CORS
1138  * so this is commented and we use application level redirects instead
1139  *
1140                                 redirects++;
1141
1142                                 if(redirects > registry_verify_cookies_redirects()) {
1143                                         buffer_flush(w->response.data);
1144                                         buffer_sprintf(w->response.data, "Your browser does not support cookies");
1145                                         return 400;
1146                                 }
1147
1148                                 char *encoded_url = url_encode(machine_url);
1149                                 if(!encoded_url) {
1150                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_url);
1151                                         return 500;
1152                                 }
1153
1154                                 char *encoded_name = url_encode(url_name);
1155                                 if(!encoded_name) {
1156                                         free(encoded_url);
1157                                         error("%llu: Cannot URL encode string '%s'", w->id, url_name);
1158                                         return 500;
1159                                 }
1160
1161                                 char *encoded_guid = url_encode(machine_guid);
1162                                 if(!encoded_guid) {
1163                                         free(encoded_url);
1164                                         free(encoded_name);
1165                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_guid);
1166                                         return 500;
1167                                 }
1168
1169                                 buffer_sprintf(w->response.header, "Location: %s/api/v1/registry?action=access&machine=%s&name=%s&url=%s&redirects=%d\r\n",
1170                                                            registry_to_announce(), encoded_guid, encoded_name, encoded_url, redirects);
1171
1172                                 free(encoded_guid);
1173                                 free(encoded_name);
1174                                 free(encoded_url);
1175                                 return 307
1176 */
1177                         }
1178                         return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
1179
1180                 case 'D':
1181                         w->tracking_required = 1;
1182                         return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
1183
1184                 case 'S':
1185                         w->tracking_required = 1;
1186                         return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
1187
1188                 case 'W':
1189                         w->tracking_required = 1;
1190                         return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
1191
1192                 case 'H':
1193                         return registry_request_hello_json(w);
1194
1195                 default:
1196                         buffer_flush(w->response.data);
1197                         buffer_sprintf(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
1198                         return 400;
1199         }
1200
1201         buffer_flush(w->response.data);
1202         buffer_sprintf(w->response.data, "Invalid or no registry action.");
1203         return 400;
1204 }
1205
1206 int web_client_api_request_v1(struct web_client *w, char *url) {
1207         static uint32_t hash_data = 0, hash_chart = 0, hash_charts = 0, hash_registry = 0, hash_badge = 0;
1208
1209         if(unlikely(hash_data == 0)) {
1210                 hash_data = simple_hash("data");
1211                 hash_chart = simple_hash("chart");
1212                 hash_charts = simple_hash("charts");
1213                 hash_registry = simple_hash("registry");
1214                 hash_badge = simple_hash("badge.svg");
1215         }
1216
1217         // get the command
1218         char *tok = mystrsep(&url, "/?&");
1219         if(tok && *tok) {
1220                 debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
1221                 uint32_t hash = simple_hash(tok);
1222
1223                 if(hash == hash_data && !strcmp(tok, "data"))
1224                         return web_client_api_request_v1_data(w, url);
1225
1226                 else if(hash == hash_chart && !strcmp(tok, "chart"))
1227                         return web_client_api_request_v1_chart(w, url);
1228
1229                 else if(hash == hash_charts && !strcmp(tok, "charts"))
1230                         return web_client_api_request_v1_charts(w, url);
1231
1232                 else if(hash == hash_registry && !strcmp(tok, "registry"))
1233                         return web_client_api_request_v1_registry(w, url);
1234
1235                 else if(hash == hash_badge && !strcmp(tok, "badge.svg"))
1236                         return web_client_api_v1_badge(w, url);
1237
1238                 else {
1239                         buffer_flush(w->response.data);
1240                         buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
1241                         return 404;
1242                 }
1243         }
1244         else {
1245                 buffer_flush(w->response.data);
1246                 buffer_sprintf(w->response.data, "API v1 command?");
1247                 return 400;
1248         }
1249 }
1250
1251 int web_client_api_request(struct web_client *w, char *url)
1252 {
1253         // get the api version
1254         char *tok = mystrsep(&url, "/?&");
1255         if(tok && *tok) {
1256                 debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
1257                 if(strcmp(tok, "v1") == 0)
1258                         return web_client_api_request_v1(w, url);
1259                 else {
1260                         buffer_flush(w->response.data);
1261                         buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
1262                         return 404;
1263                 }
1264         }
1265         else {
1266                 buffer_flush(w->response.data);
1267                 buffer_sprintf(w->response.data, "Which API version?");
1268                 return 400;
1269         }
1270 }
1271
1272 int web_client_api_old_data_request(struct web_client *w, char *url, int datasource_type)
1273 {
1274         RRDSET *st = NULL;
1275
1276         char *args = strchr(url, '?');
1277         if(args) {
1278                 *args='\0';
1279                 args = &args[1];
1280         }
1281
1282         // get the name of the data to show
1283         char *tok = mystrsep(&url, "/");
1284
1285         // do we have such a data set?
1286         if(tok && *tok) {
1287                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1288                 st = rrdset_find_byname(tok);
1289                 if(!st) st = rrdset_find(tok);
1290         }
1291
1292         if(!st) {
1293                 // we don't have it
1294                 // try to send a file with that name
1295                 buffer_flush(w->response.data);
1296                 return(mysendfile(w, tok));
1297         }
1298
1299         // we have it
1300         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
1301
1302         // how many entries does the client want?
1303         long lines = rrd_default_history_entries;
1304         long group_count = 1;
1305         time_t after = 0, before = 0;
1306         int group_method = GROUP_AVERAGE;
1307         int nonzero = 0;
1308
1309         if(url) {
1310                 // parse the lines required
1311                 tok = mystrsep(&url, "/");
1312                 if(tok) lines = atoi(tok);
1313                 if(lines < 1) lines = 1;
1314         }
1315         if(url) {
1316                 // parse the group count required
1317                 tok = mystrsep(&url, "/");
1318                 if(tok && *tok) group_count = atoi(tok);
1319                 if(group_count < 1) group_count = 1;
1320                 //if(group_count > save_history / 20) group_count = save_history / 20;
1321         }
1322         if(url) {
1323                 // parse the grouping method required
1324                 tok = mystrsep(&url, "/");
1325                 if(tok && *tok) {
1326                         if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
1327                         else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
1328                         else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
1329                         else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
1330                 }
1331         }
1332         if(url) {
1333                 // parse after time
1334                 tok = mystrsep(&url, "/");
1335                 if(tok && *tok) after = strtoul(tok, NULL, 10);
1336                 if(after < 0) after = 0;
1337         }
1338         if(url) {
1339                 // parse before time
1340                 tok = mystrsep(&url, "/");
1341                 if(tok && *tok) before = strtoul(tok, NULL, 10);
1342                 if(before < 0) before = 0;
1343         }
1344         if(url) {
1345                 // parse nonzero
1346                 tok = mystrsep(&url, "/");
1347                 if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
1348         }
1349
1350         w->response.data->contenttype = CT_APPLICATION_JSON;
1351         buffer_flush(w->response.data);
1352
1353         char *google_version = "0.6";
1354         char *google_reqId = "0";
1355         char *google_sig = "0";
1356         char *google_out = "json";
1357         char *google_responseHandler = "google.visualization.Query.setResponse";
1358         char *google_outFileName = NULL;
1359         time_t last_timestamp_in_data = 0;
1360         if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
1361
1362                 w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1363
1364                 while(args) {
1365                         tok = mystrsep(&args, "&");
1366                         if(tok && *tok) {
1367                                 char *name = mystrsep(&tok, "=");
1368                                 if(name && *name && strcmp(name, "tqx") == 0) {
1369                                         char *key = mystrsep(&tok, ":");
1370                                         char *value = mystrsep(&tok, ";");
1371                                         if(key && value && *key && *value) {
1372                                                 if(strcmp(key, "version") == 0)
1373                                                         google_version = value;
1374
1375                                                 else if(strcmp(key, "reqId") == 0)
1376                                                         google_reqId = value;
1377
1378                                                 else if(strcmp(key, "sig") == 0)
1379                                                         google_sig = value;
1380
1381                                                 else if(strcmp(key, "out") == 0)
1382                                                         google_out = value;
1383
1384                                                 else if(strcmp(key, "responseHandler") == 0)
1385                                                         google_responseHandler = value;
1386
1387                                                 else if(strcmp(key, "outFileName") == 0)
1388                                                         google_outFileName = value;
1389                                         }
1390                                 }
1391                         }
1392                 }
1393
1394                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
1395                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
1396                         );
1397
1398                 if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1399                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
1400
1401                         // check the client wants json
1402                         if(strcmp(google_out, "json") != 0) {
1403                                 buffer_sprintf(w->response.data,
1404                                         "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'invalid_query',message:'output format is not supported',detailed_message:'the format %s requested is not supported by netdata.'}]});",
1405                                         google_responseHandler, google_version, google_reqId, google_out);
1406                                         return 200;
1407                         }
1408                 }
1409         }
1410
1411         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1412                 buffer_sprintf(w->response.data,
1413                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
1414                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1415         }
1416
1417         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending RRD data '%s' (id %s, %d lines, %d group, %d group_method, %lu after, %lu before).", w->id, st->name, st->id, lines, group_count, group_method, after, before);
1418         time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, after, before, nonzero);
1419
1420         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1421                 if(timestamp_in_data > last_timestamp_in_data)
1422                         buffer_strcat(w->response.data, "});");
1423
1424                 else {
1425                         // the client already has the latest data
1426                         buffer_flush(w->response.data);
1427                         buffer_sprintf(w->response.data,
1428                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1429                                 google_responseHandler, google_version, google_reqId);
1430                 }
1431         }
1432
1433         return 200;
1434 }
1435
1436 const char *web_content_type_to_string(uint8_t contenttype) {
1437         switch(contenttype) {
1438                 case CT_TEXT_HTML:
1439                         return "text/html; charset=utf-8";
1440
1441                 case CT_APPLICATION_XML:
1442                         return "application/xml; charset=utf-8";
1443
1444                 case CT_APPLICATION_JSON:
1445                         return "application/json; charset=utf-8";
1446
1447                 case CT_APPLICATION_X_JAVASCRIPT:
1448                         return "application/x-javascript; charset=utf-8";
1449
1450                 case CT_TEXT_CSS:
1451                         return "text/css; charset=utf-8";
1452
1453                 case CT_TEXT_XML:
1454                         return "text/xml; charset=utf-8";
1455
1456                 case CT_TEXT_XSL:
1457                         return "text/xsl; charset=utf-8";
1458
1459                 case CT_APPLICATION_OCTET_STREAM:
1460                         return "application/octet-stream";
1461
1462                 case CT_IMAGE_SVG_XML:
1463                         return "image/svg+xml";
1464
1465                 case CT_APPLICATION_X_FONT_TRUETYPE:
1466                         return "application/x-font-truetype";
1467
1468                 case CT_APPLICATION_X_FONT_OPENTYPE:
1469                         return "application/x-font-opentype";
1470
1471                 case CT_APPLICATION_FONT_WOFF:
1472                         return "application/font-woff";
1473
1474                 case CT_APPLICATION_FONT_WOFF2:
1475                         return "application/font-woff2";
1476
1477                 case CT_APPLICATION_VND_MS_FONTOBJ:
1478                         return "application/vnd.ms-fontobject";
1479
1480                 case CT_IMAGE_PNG:
1481                         return "image/png";
1482
1483                 case CT_IMAGE_JPG:
1484                         return "image/jpeg";
1485
1486                 case CT_IMAGE_GIF:
1487                         return "image/gif";
1488
1489                 case CT_IMAGE_XICON:
1490                         return "image/x-icon";
1491
1492                 case CT_IMAGE_BMP:
1493                         return "image/bmp";
1494
1495                 case CT_IMAGE_ICNS:
1496                         return "image/icns";
1497
1498                 default:
1499                 case CT_TEXT_PLAIN:
1500                         return "text/plain; charset=utf-8";
1501         }
1502 }
1503
1504
1505 const char *web_response_code_to_string(int code) {
1506         switch(code) {
1507                 case 200:
1508                         return "OK";
1509
1510                 case 307:
1511                         return "Temporary Redirect";
1512
1513                 case 400:
1514                         return "Bad Request";
1515
1516                 case 403:
1517                         return "Forbidden";
1518
1519                 case 404:
1520                         return "Not Found";
1521
1522                 case 412:
1523                         return "Preconditions Failed";
1524
1525                 default:
1526                         if(code >= 100 && code < 200)
1527                                 return "Informational";
1528
1529                         if(code >= 200 && code < 300)
1530                                 return "Successful";
1531
1532                         if(code >= 300 && code < 400)
1533                                 return "Redirection";
1534
1535                         if(code >= 400 && code < 500)
1536                                 return "Bad Request";
1537
1538                         if(code >= 500 && code < 600)
1539                                 return "Server Error";
1540
1541                         return "Undefined Error";
1542         }
1543 }
1544
1545 static inline char *http_header_parse(struct web_client *w, char *s) {
1546         static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0;
1547
1548         if(unlikely(!hash_origin)) {
1549                 hash_origin = simple_uhash("Origin");
1550                 hash_connection = simple_uhash("Connection");
1551                 hash_accept_encoding = simple_uhash("Accept-Encoding");
1552                 hash_donottrack = simple_uhash("DNT");
1553         }
1554
1555         char *e = s;
1556
1557         // find the :
1558         while(*e && *e != ':') e++;
1559         if(!*e) return e;
1560
1561         // get the name
1562         *e = '\0';
1563
1564         // find the value
1565         char *v = e + 1, *ve;
1566
1567         // skip leading spaces from value
1568         while(*v == ' ') v++;
1569         ve = v;
1570
1571         // find the \r
1572         while(*ve && *ve != '\r') ve++;
1573         if(!*ve || ve[1] != '\n') {
1574                 *e = ':';
1575                 return ve;
1576         }
1577
1578         // terminate the value
1579         *ve = '\0';
1580
1581         // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
1582         uint32_t hash = simple_uhash(s);
1583
1584         if(hash == hash_origin && !strcasecmp(s, "Origin"))
1585                 strncpyz(w->origin, v, ORIGIN_MAX);
1586
1587         else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
1588                 if(strcasestr(v, "keep-alive"))
1589                         w->keepalive = 1;
1590         }
1591         else if(web_donotrack_comply && hash == hash_donottrack && !strcasecmp(s, "DNT")) {
1592                 if(*v == '0') w->donottrack = 0;
1593                 else if(*v == '1') w->donottrack = 1;
1594         }
1595 #ifdef NETDATA_WITH_ZLIB
1596         else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
1597                 if(web_enable_gzip) {
1598                         if(strcasestr(v, "gzip"))
1599                                 web_client_enable_deflate(w, 1);
1600                         //
1601                         // does not seem to work
1602                         // else if(strcasestr(v, "deflate"))
1603                         //      web_client_enable_deflate(w, 0);
1604                 }
1605         }
1606 #endif /* NETDATA_WITH_ZLIB */
1607
1608         *e = ':';
1609         *ve = '\r';
1610         return ve;
1611 }
1612
1613 // http_request_validate()
1614 // returns:
1615 // = 0 : all good, process the request
1616 // > 0 : request is not supported
1617 // < 0 : request is incomplete - wait for more data
1618
1619 static inline int http_request_validate(struct web_client *w) {
1620         char *s = w->response.data->buffer, *encoded_url = NULL;
1621
1622         // is is a valid request?
1623         if(!strncmp(s, "GET ", 4)) {
1624                 encoded_url = s = &s[4];
1625                 w->mode = WEB_CLIENT_MODE_NORMAL;
1626         }
1627         else if(!strncmp(s, "OPTIONS ", 8)) {
1628                 encoded_url = s = &s[8];
1629                 w->mode = WEB_CLIENT_MODE_OPTIONS;
1630         }
1631         else {
1632                 w->wait_receive = 0;
1633                 return 1;
1634         }
1635
1636         // find the SPACE + "HTTP/"
1637         while(*s) {
1638                 // find the next space
1639                 while (*s && *s != ' ') s++;
1640
1641                 // is it SPACE + "HTTP/" ?
1642                 if(*s && !strncmp(s, " HTTP/", 6)) break;
1643                 else s++;
1644         }
1645
1646         // incomplete requests
1647         if(unlikely(!*s)) {
1648                 w->wait_receive = 1;
1649                 return -2;
1650         }
1651
1652         // we have the end of encoded_url - remember it
1653         char *ue = s;
1654
1655         // make sure we have complete request
1656         // complete requests contain: \r\n\r\n
1657         while(*s) {
1658                 // find a line feed
1659                 while(*s && *s++ != '\r');
1660
1661                 // did we reach the end?
1662                 if(unlikely(!*s)) break;
1663
1664                 // is it \r\n ?
1665                 if(likely(*s++ == '\n')) {
1666
1667                         // is it again \r\n ? (header end)
1668                         if(unlikely(*s == '\r' && s[1] == '\n')) {
1669                                 // a valid complete HTTP request found
1670
1671                                 *ue = '\0';
1672                                 url_decode_r(w->decoded_url, encoded_url, URL_MAX + 1);
1673                                 *ue = ' ';
1674
1675                                 // copy the URL - we are going to overwrite parts of it
1676                                 // FIXME -- we should avoid it
1677                                 strncpyz(w->last_url, w->decoded_url, URL_MAX);
1678
1679                                 w->wait_receive = 0;
1680                                 return 0;
1681                         }
1682
1683                         // another header line
1684                         s = http_header_parse(w, s);
1685                 }
1686         }
1687
1688         // incomplete request
1689         w->wait_receive = 1;
1690         return -3;
1691 }
1692
1693 void web_client_process(struct web_client *w) {
1694         static uint32_t hash_api = 0, hash_netdata_conf = 0, hash_data = 0, hash_datasource = 0, hash_graph = 0,
1695                         hash_list = 0, hash_all_json = 0, hash_exit = 0, hash_debug = 0, hash_mirror = 0;
1696
1697         if(unlikely(!hash_api)) {
1698                 hash_api = simple_hash("api");
1699                 hash_netdata_conf = simple_hash("netdata.conf");
1700                 hash_data = simple_hash(WEB_PATH_DATA);
1701                 hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
1702                 hash_graph = simple_hash(WEB_PATH_GRAPH);
1703                 hash_list = simple_hash("list");
1704                 hash_all_json = simple_hash("all.json");
1705                 hash_exit = simple_hash("exit");
1706                 hash_debug = simple_hash("debug");
1707                 hash_mirror = simple_hash("mirror");
1708         }
1709
1710         int code = 500;
1711         ssize_t bytes;
1712
1713         int what_to_do = http_request_validate(w);
1714
1715         // wait for more data
1716         if(what_to_do < 0) {
1717                 if(w->response.data->len > TOO_BIG_REQUEST) {
1718                         strcpy(w->last_url, "too big request");
1719
1720                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
1721
1722                         code = 400;
1723                         buffer_flush(w->response.data);
1724                         buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
1725                 }
1726                 else {
1727                         // wait for more data
1728                         return;
1729                 }
1730         }
1731         else if(what_to_do > 0) {
1732                 strcpy(w->last_url, "not a valid request");
1733
1734                 debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
1735
1736                 code = 500;
1737                 buffer_flush(w->response.data);
1738                 buffer_strcat(w->response.data, "I don't understand you...\r\n");
1739         }
1740         else { // what_to_do == 0
1741                 gettimeofday(&w->tv_in, NULL);
1742
1743                 if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1744                         code = 200;
1745                         w->response.data->contenttype = CT_TEXT_PLAIN;
1746                         buffer_flush(w->response.data);
1747                         buffer_strcat(w->response.data, "OK");
1748                 }
1749                 else {
1750                         char *url = w->decoded_url;
1751                         char *tok = mystrsep(&url, "/?");
1752                         if(tok && *tok) {
1753                                 uint32_t hash = simple_hash(tok);
1754                                 debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
1755
1756                                 if(hash == hash_api && strcmp(tok, "api") == 0) {
1757                                         // the client is requesting api access
1758                                         code = web_client_api_request(w, url);
1759                                 }
1760                                 else if(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0) {
1761                                         code = 200;
1762                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
1763
1764                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1765                                         buffer_flush(w->response.data);
1766                                         generate_config(w->response.data, 0);
1767                                 }
1768                                 else if(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
1769                                         // the client is requesting rrd data -- OLD API
1770                                         code = web_client_api_old_data_request(w, url, DATASOURCE_JSON);
1771                                 }
1772                                 else if(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
1773                                         // the client is requesting google datasource -- OLD API
1774                                         code = web_client_api_old_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
1775                                 }
1776                                 else if(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
1777                                         // the client is requesting an rrd graph -- OLD API
1778
1779                                         // get the name of the data to show
1780                                         tok = mystrsep(&url, "/?&");
1781                                         if(tok && *tok) {
1782                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1783
1784                                                 // do we have such a data set?
1785                                                 RRDSET *st = rrdset_find_byname(tok);
1786                                                 if(!st) st = rrdset_find(tok);
1787                                                 if(!st) {
1788                                                         // we don't have it
1789                                                         // try to send a file with that name
1790                                                         buffer_flush(w->response.data);
1791                                                         code = mysendfile(w, tok);
1792                                                 }
1793                                                 else {
1794                                                         code = 200;
1795                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
1796                                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1797                                                         buffer_flush(w->response.data);
1798                                                         rrd_stats_graph_json(st, url, w->response.data);
1799                                                 }
1800                                         }
1801                                         else {
1802                                                 code = 400;
1803                                                 buffer_flush(w->response.data);
1804                                                 buffer_strcat(w->response.data, "Graph name?\r\n");
1805                                         }
1806                                 }
1807                                 else if(hash == hash_list && strcmp(tok, "list") == 0) {
1808                                         // OLD API
1809                                         code = 200;
1810
1811                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
1812
1813                                         buffer_flush(w->response.data);
1814                                         RRDSET *st = rrdset_root;
1815
1816                                         for ( ; st ; st = st->next )
1817                                                 buffer_sprintf(w->response.data, "%s\n", st->name);
1818                                 }
1819                                 else if(hash == hash_all_json && strcmp(tok, "all.json") == 0) {
1820                                         // OLD API
1821                                         code = 200;
1822                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
1823
1824                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1825                                         buffer_flush(w->response.data);
1826                                         rrd_stats_all_json(w->response.data);
1827                                 }
1828 #ifdef NETDATA_INTERNAL_CHECKS
1829                                 else if(hash == hash_exit && strcmp(tok, "exit") == 0) {
1830                                         code = 200;
1831                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1832                                         buffer_flush(w->response.data);
1833
1834                                         if(!netdata_exit)
1835                                                 buffer_strcat(w->response.data, "ok, will do...");
1836                                         else
1837                                                 buffer_strcat(w->response.data, "I am doing it already");
1838
1839                                         netdata_exit = 1;
1840                                 }
1841                                 else if(hash == hash_debug && strcmp(tok, "debug") == 0) {
1842                                         buffer_flush(w->response.data);
1843
1844                                         // get the name of the data to show
1845                                         tok = mystrsep(&url, "/?&");
1846                                         if(tok && *tok) {
1847                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1848
1849                                                 // do we have such a data set?
1850                                                 RRDSET *st = rrdset_find_byname(tok);
1851                                                 if(!st) st = rrdset_find(tok);
1852                                                 if(!st) {
1853                                                         code = 404;
1854                                                         buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
1855                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
1856                                                 }
1857                                                 else {
1858                                                         code = 200;
1859                                                         debug_flags |= D_RRD_STATS;
1860                                                         st->debug = !st->debug;
1861                                                         buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
1862                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
1863                                                 }
1864                                         }
1865                                         else {
1866                                                 code = 500;
1867                                                 buffer_flush(w->response.data);
1868                                                 buffer_strcat(w->response.data, "debug which chart?\r\n");
1869                                         }
1870                                 }
1871                                 else if(hash == hash_mirror && strcmp(tok, "mirror") == 0) {
1872                                         code = 200;
1873
1874                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
1875
1876                                         // replace the zero bytes with spaces
1877                                         buffer_char_replace(w->response.data, '\0', ' ');
1878
1879                                         // just leave the buffer as is
1880                                         // it will be copied back to the client
1881                                 }
1882 #endif  /* NETDATA_INTERNAL_CHECKS */
1883                                 else {
1884                                         char filename[FILENAME_MAX+1];
1885                                         url = filename;
1886                                         strncpyz(filename, w->last_url, FILENAME_MAX);
1887                                         tok = mystrsep(&url, "?");
1888                                         buffer_flush(w->response.data);
1889                                         code = mysendfile(w, (tok && *tok)?tok:"/");
1890                                 }
1891                         }
1892                         else {
1893                                 char filename[FILENAME_MAX+1];
1894                                 url = filename;
1895                                 strncpyz(filename, w->last_url, FILENAME_MAX);
1896                                 tok = mystrsep(&url, "?");
1897                                 buffer_flush(w->response.data);
1898                                 code = mysendfile(w, (tok && *tok)?tok:"/");
1899                         }
1900                 }
1901         }
1902
1903         gettimeofday(&w->tv_ready, NULL);
1904         w->response.data->date = time(NULL);
1905         w->response.sent = 0;
1906         w->response.code = code;
1907
1908         // prepare the HTTP response header
1909         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
1910
1911         const char *content_type_string = web_content_type_to_string(w->response.data->contenttype);
1912         const char *code_msg = web_response_code_to_string(code);
1913
1914         char date[100];
1915         struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
1916         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
1917
1918         buffer_sprintf(w->response.header_output,
1919                 "HTTP/1.1 %d %s\r\n"
1920                 "Connection: %s\r\n"
1921                 "Server: NetData Embedded HTTP Server\r\n"
1922                 "Access-Control-Allow-Origin: %s\r\n"
1923                 "Access-Control-Allow-Credentials: true\r\n"
1924                 "Content-Type: %s\r\n"
1925                 "Date: %s\r\n"
1926                 , code, code_msg
1927                 , w->keepalive?"keep-alive":"close"
1928                 , w->origin
1929                 , content_type_string
1930                 , date
1931                 );
1932
1933         if(w->cookie1[0] || w->cookie2[0]) {
1934                 if(w->cookie1[0]) {
1935                         buffer_sprintf(w->response.header_output,
1936                            "Set-Cookie: %s\r\n",
1937                            w->cookie1);
1938                 }
1939
1940                 if(w->cookie2[0]) {
1941                         buffer_sprintf(w->response.header_output,
1942                            "Set-Cookie: %s\r\n",
1943                            w->cookie2);
1944                 }
1945
1946                 if(web_donotrack_comply)
1947                         buffer_sprintf(w->response.header_output,
1948                            "Tk: T;cookies\r\n");
1949         }
1950         else {
1951                 if(web_donotrack_comply) {
1952                         if(w->tracking_required)
1953                                 buffer_sprintf(w->response.header_output,
1954                                    "Tk: T;cookies\r\n");
1955                         else
1956                                 buffer_sprintf(w->response.header_output,
1957                                    "Tk: N\r\n");
1958                 }
1959         }
1960
1961         if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1962                 buffer_strcat(w->response.header_output,
1963                         "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
1964                         "Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
1965                         "Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
1966                         );
1967         }
1968
1969         if(buffer_strlen(w->response.header))
1970                 buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
1971
1972         if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
1973                 buffer_sprintf(w->response.header_output,
1974                         "Expires: %s\r\n"
1975                         "Cache-Control: no-cache\r\n"
1976                         , date);
1977         }
1978         else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
1979                 char edate[100];
1980                 time_t et = w->response.data->date + (86400 * 14);
1981                 struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
1982                 strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
1983
1984                 buffer_sprintf(w->response.header_output,
1985                         "Expires: %s\r\n"
1986                         "Cache-Control: public\r\n"
1987                         , edate);
1988         }
1989
1990         // if we know the content length, put it
1991         if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
1992                 buffer_sprintf(w->response.header_output,
1993                         "Content-Length: %ld\r\n"
1994                         , w->response.data->len? w->response.data->len: w->response.rlen
1995                         );
1996         else if(!w->response.zoutput)
1997                 w->keepalive = 0;       // content-length is required for keep-alive
1998
1999         if(w->response.zoutput) {
2000                 buffer_strcat(w->response.header_output,
2001                         "Content-Encoding: gzip\r\n"
2002                         "Transfer-Encoding: chunked\r\n"
2003                         );
2004         }
2005
2006         buffer_strcat(w->response.header_output, "\r\n");
2007
2008         // sent the HTTP header
2009         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
2010                         , w->id
2011                         , buffer_strlen(w->response.header_output)
2012                         , buffer_tostring(w->response.header_output)
2013                         );
2014
2015         web_client_crock_socket(w);
2016
2017         bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
2018         if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
2019                 if(bytes > 0)
2020                         w->stats_sent_bytes += bytes;
2021
2022                 debug(D_WEB_CLIENT, "%llu: HTTP Header failed to be sent (I sent %d bytes but the system sent %d bytes). Closing web client.", w->id,
2023                           buffer_strlen(w->response.header_output), bytes);
2024
2025                 WEB_CLIENT_IS_DEAD(w);
2026                 return;
2027         }
2028         else
2029                 w->stats_sent_bytes += bytes;
2030
2031         // enable sending immediately if we have data
2032         if(w->response.data->len) w->wait_send = 1;
2033         else w->wait_send = 0;
2034
2035         // pretty logging
2036         switch(w->mode) {
2037                 case WEB_CLIENT_MODE_OPTIONS:
2038                         debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2039                         break;
2040
2041                 case WEB_CLIENT_MODE_NORMAL:
2042                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2043                         break;
2044
2045                 case WEB_CLIENT_MODE_FILECOPY:
2046                         if(w->response.rlen) {
2047                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
2048                                 w->wait_receive = 1;
2049
2050                                 /*
2051                                 // utilize the kernel sendfile() for copying the file to the socket.
2052                                 // this block of code can be commented, without anything missing.
2053                                 // when it is commented, the program will copy the data using async I/O.
2054                                 {
2055                                         long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
2056                                         if(len != w->response.data->rbytes)
2057                                                 error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
2058                                         else
2059                                                 web_client_reset(w);
2060                                 }
2061                                 */
2062                         }
2063                         else
2064                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
2065                         break;
2066
2067                 default:
2068                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
2069                         break;
2070         }
2071 }
2072
2073 ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
2074 {
2075         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
2076         char buf[1024];
2077         sprintf(buf, "%zX\r\n", len);
2078
2079         ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
2080         if(bytes > 0) {
2081                 debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
2082                 w->stats_sent_bytes += bytes;
2083         }
2084
2085         else if(bytes == 0) {
2086                 debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
2087                 WEB_CLIENT_IS_DEAD(w);
2088         }
2089         else {
2090                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk header to client.", w->id);
2091                 WEB_CLIENT_IS_DEAD(w);
2092         }
2093
2094         return bytes;
2095 }
2096
2097 ssize_t web_client_send_chunk_close(struct web_client *w)
2098 {
2099         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
2100
2101         ssize_t bytes = send(w->ofd, "\r\n", 2, 0);
2102         if(bytes > 0) {
2103                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2104                 w->stats_sent_bytes += bytes;
2105         }
2106
2107         else if(bytes == 0) {
2108                 debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
2109                 WEB_CLIENT_IS_DEAD(w);
2110         }
2111         else {
2112                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk suffix to client.", w->id);
2113                 WEB_CLIENT_IS_DEAD(w);
2114         }
2115
2116         return bytes;
2117 }
2118
2119 ssize_t web_client_send_chunk_finalize(struct web_client *w)
2120 {
2121         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
2122
2123         ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
2124         if(bytes > 0) {
2125                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2126                 w->stats_sent_bytes += bytes;
2127         }
2128
2129         else if(bytes == 0) {
2130                 debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
2131                 WEB_CLIENT_IS_DEAD(w);
2132         }
2133         else {
2134                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
2135                 WEB_CLIENT_IS_DEAD(w);
2136         }
2137
2138         return bytes;
2139 }
2140
2141 #ifdef NETDATA_WITH_ZLIB
2142 ssize_t web_client_send_deflate(struct web_client *w)
2143 {
2144         ssize_t len = 0, t = 0;
2145
2146         // when using compression,
2147         // w->response.sent is the amount of bytes passed through compression
2148
2149         debug(D_DEFLATE, "%llu: web_client_send_deflate(): w->response.data->len = %d, w->response.sent = %d, w->response.zhave = %d, w->response.zsent = %d, w->response.zstream.avail_in = %d, w->response.zstream.avail_out = %d, w->response.zstream.total_in = %d, w->response.zstream.total_out = %d.", w->id, w->response.data->len, w->response.sent, w->response.zhave, w->response.zsent, w->response.zstream.avail_in, w->response.zstream.avail_out, w->response.zstream.total_in, w->response.zstream.total_out);
2150
2151         if(w->response.data->len - w->response.sent == 0 && w->response.zstream.avail_in == 0 && w->response.zhave == w->response.zsent && w->response.zstream.avail_out != 0) {
2152                 // there is nothing to send
2153
2154                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2155
2156                 // finalize the chunk
2157                 if(w->response.sent != 0) {
2158                         t = web_client_send_chunk_finalize(w);
2159                         if(t < 0) return t;
2160                 }
2161
2162                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2163                         // we have to wait, more data will come
2164                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2165                         w->wait_send = 0;
2166                         return t;
2167                 }
2168
2169                 if(unlikely(!w->keepalive)) {
2170                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2171                         WEB_CLIENT_IS_DEAD(w);
2172                         return t;
2173                 }
2174
2175                 // reset the client
2176                 web_client_reset(w);
2177                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
2178                 return t;
2179         }
2180
2181         if(w->response.zhave == w->response.zsent) {
2182                 // compress more input data
2183
2184                 // close the previous open chunk
2185                 if(w->response.sent != 0) {
2186                         t = web_client_send_chunk_close(w);
2187                         if(t < 0) return t;
2188                 }
2189
2190                 debug(D_DEFLATE, "%llu: Compressing %d new bytes starting from %d (and %d left behind).", w->id, (w->response.data->len - w->response.sent), w->response.sent, w->response.zstream.avail_in);
2191
2192                 // give the compressor all the data not passed through the compressor yet
2193                 if(w->response.data->len > w->response.sent) {
2194                         w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
2195                         w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
2196                 }
2197
2198                 // reset the compressor output buffer
2199                 w->response.zstream.next_out = w->response.zbuffer;
2200                 w->response.zstream.avail_out = ZLIB_CHUNK;
2201
2202                 // ask for FINISH if we have all the input
2203                 int flush = Z_SYNC_FLUSH;
2204                 if(w->mode == WEB_CLIENT_MODE_NORMAL
2205                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
2206                         flush = Z_FINISH;
2207                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
2208                 }
2209                 else {
2210                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
2211                 }
2212
2213                 // compress
2214                 if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
2215                         error("%llu: Compression failed. Closing down client.", w->id);
2216                         web_client_reset(w);
2217                         return(-1);
2218                 }
2219
2220                 w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
2221                 w->response.zsent = 0;
2222
2223                 // keep track of the bytes passed through the compressor
2224                 w->response.sent = w->response.data->len;
2225
2226                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
2227
2228                 // open a new chunk
2229                 ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
2230                 if(t2 < 0) return t2;
2231                 t += t2;
2232         }
2233
2234         debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
2235
2236         len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
2237         if(len > 0) {
2238                 w->stats_sent_bytes += len;
2239                 w->response.zsent += len;
2240                 len += t;
2241                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
2242         }
2243         else if(len == 0) {
2244                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client (zhave = %ld, zsent = %ld, need to send = %ld).", w->id, w->response.zhave, w->response.zsent, w->response.zhave - w->response.zsent);
2245                 WEB_CLIENT_IS_DEAD(w);
2246         }
2247         else {
2248                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2249                 WEB_CLIENT_IS_DEAD(w);
2250         }
2251
2252         return(len);
2253 }
2254 #endif // NETDATA_WITH_ZLIB
2255
2256 ssize_t web_client_send(struct web_client *w) {
2257 #ifdef NETDATA_WITH_ZLIB
2258         if(likely(w->response.zoutput)) return web_client_send_deflate(w);
2259 #endif // NETDATA_WITH_ZLIB
2260
2261         ssize_t bytes;
2262
2263         if(unlikely(w->response.data->len - w->response.sent == 0)) {
2264                 // there is nothing to send
2265
2266                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2267
2268                 // there can be two cases for this
2269                 // A. we have done everything
2270                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
2271
2272                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2273                         // we have to wait, more data will come
2274                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2275                         w->wait_send = 0;
2276                         return 0;
2277                 }
2278
2279                 if(unlikely(!w->keepalive)) {
2280                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2281                         WEB_CLIENT_IS_DEAD(w);
2282                         return 0;
2283                 }
2284
2285                 web_client_reset(w);
2286                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
2287                 return 0;
2288         }
2289
2290         bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
2291         if(likely(bytes > 0)) {
2292                 w->stats_sent_bytes += bytes;
2293                 w->response.sent += bytes;
2294                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
2295         }
2296         else if(likely(bytes == 0)) {
2297                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
2298                 WEB_CLIENT_IS_DEAD(w);
2299         }
2300         else {
2301                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2302                 WEB_CLIENT_IS_DEAD(w);
2303         }
2304
2305         return(bytes);
2306 }
2307
2308 ssize_t web_client_receive(struct web_client *w)
2309 {
2310         // do we have any space for more data?
2311         buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
2312
2313         ssize_t left = w->response.data->size - w->response.data->len;
2314         ssize_t bytes;
2315
2316         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
2317                 bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
2318         else
2319                 bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
2320
2321         if(likely(bytes > 0)) {
2322                 if(w->mode != WEB_CLIENT_MODE_FILECOPY)
2323                         w->stats_received_bytes += bytes;
2324
2325                 size_t old = w->response.data->len;
2326                 w->response.data->len += bytes;
2327                 w->response.data->buffer[w->response.data->len] = '\0';
2328
2329                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
2330                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
2331
2332                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2333                         w->wait_send = 1;
2334
2335                         if(w->response.rlen && w->response.data->len >= w->response.rlen)
2336                                 w->wait_receive = 0;
2337                 }
2338         }
2339         else if(likely(bytes == 0)) {
2340                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
2341
2342                 // if we cannot read, it means we have an error on input.
2343                 // if however, we are copying a file from ifd to ofd, we should not return an error.
2344                 // in this case, the error should be generated when the file has been sent to the client.
2345
2346                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2347                         // we are copying data from ifd to ofd
2348                         // let it finish copying...
2349                         w->wait_receive = 0;
2350
2351                         debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
2352                         if(w->ifd != w->ofd) close(w->ifd);
2353                         w->ifd = w->ofd;
2354                 }
2355                 else {
2356                         debug(D_WEB_CLIENT, "%llu: failed to receive data.", w->id);
2357                         WEB_CLIENT_IS_DEAD(w);
2358                 }
2359         }
2360         else {
2361                 debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
2362                 WEB_CLIENT_IS_DEAD(w);
2363         }
2364
2365         return(bytes);
2366 }
2367
2368
2369 // --------------------------------------------------------------------------------------
2370 // the thread of a single client
2371
2372 // 1. waits for input and output, using async I/O
2373 // 2. it processes HTTP requests
2374 // 3. it generates HTTP responses
2375 // 4. it copies data from input to output if mode is FILECOPY
2376
2377 void *web_client_main(void *ptr)
2378 {
2379         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
2380                 error("Cannot set pthread cancel type to DEFERRED.");
2381
2382         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
2383                 error("Cannot set pthread cancel state to ENABLE.");
2384
2385         struct web_client *w = ptr;
2386         struct pollfd fds[2], *ifd, *ofd;
2387         int retval, fdmax = 0, timeout;
2388
2389         log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2390
2391         for(;;) {
2392                 if(unlikely(w->dead)) {
2393                         debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
2394                         break;
2395                 }
2396                 else if(unlikely(!w->wait_receive && !w->wait_send)) {
2397                         debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.");
2398                         break;
2399                 }
2400
2401                 if(unlikely(w->ifd < 0 || w->ofd < 0)) {
2402                         error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
2403                         break;
2404                 }
2405
2406                 if(w->ifd == w->ofd) {
2407                         fds[0].fd = w->ifd;
2408                         fds[0].events = 0;
2409                         fds[0].revents = 0;
2410
2411                         if(w->wait_receive) fds[0].events |= POLLIN;
2412                         if(w->wait_send)    fds[0].events |= POLLOUT;
2413
2414                         fds[1].fd = -1;
2415                         fds[1].events = 0;
2416                         fds[1].revents = 0;
2417
2418                         ifd = ofd = &fds[0];
2419
2420                         fdmax = 1;
2421                 }
2422                 else {
2423                         fds[0].fd = w->ifd;
2424                         fds[0].events = 0;
2425                         fds[0].revents = 0;
2426                         if(w->wait_receive) fds[0].events |= POLLIN;
2427                         ifd = &fds[0];
2428
2429                         fds[1].fd = w->ofd;
2430                         fds[1].events = 0;
2431                         fds[1].revents = 0;
2432                         if(w->wait_send)    fds[1].events |= POLLOUT;
2433                         ofd = &fds[1];
2434
2435                         fdmax = 2;
2436                 }
2437
2438                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2439                 errno = 0;
2440                 timeout = web_client_timeout * 1000;
2441                 retval = poll(fds, fdmax, timeout);
2442
2443                 if(unlikely(retval == -1)) {
2444                         if(errno == EAGAIN || errno == EINTR) {
2445                                 debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
2446                                 continue;
2447                         }
2448
2449                         debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
2450                         break;
2451                 }
2452                 else if(unlikely(!retval)) {
2453                         debug(D_WEB_CLIENT, "%llu: Timeout while waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2454                         break;
2455                 }
2456
2457                 int used = 0;
2458                 if(w->wait_send && ofd->revents & POLLOUT) {
2459                         used++;
2460                         if(web_client_send(w) < 0) {
2461                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
2462                                 break;
2463                         }
2464                 }
2465
2466                 if(w->wait_receive && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
2467                         used++;
2468                         if(web_client_receive(w) < 0) {
2469                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
2470                                 break;
2471                         }
2472
2473                         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
2474                                 debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
2475                                 web_client_process(w);
2476                         }
2477                 }
2478
2479                 if(unlikely(!used)) {
2480                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
2481                         break;
2482                 }
2483         }
2484
2485         web_client_reset(w);
2486
2487         log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2488         debug(D_WEB_CLIENT, "%llu: done...", w->id);
2489
2490         // close the sockets/files now
2491         // to free file descriptors
2492         if(w->ifd == w->ofd) {
2493                 if(w->ifd != -1) close(w->ifd);
2494         }
2495         else {
2496                 if(w->ifd != -1) close(w->ifd);
2497                 if(w->ofd != -1) close(w->ofd);
2498         }
2499         w->ifd = -1;
2500         w->ofd = -1;
2501
2502         w->obsolete = 1;
2503
2504         pthread_exit(NULL);
2505         return NULL;
2506 }