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                 else if(!strcmp(tok, "unaligned"))
 563                         ret |= RRDR_OPTION_NOT_ALIGNED;
 564         }
 565
 566         return ret;
 567 }
 568
 569 uint32_t web_client_api_request_v1_data_format(char *name)
 570 {
 571         if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
 572                 return DATASOURCE_DATATABLE_JSON;
 573
 574         else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
 575                 return DATASOURCE_DATATABLE_JSONP;
 576
 577         else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
 578                 return DATASOURCE_JSON;
 579
 580         else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
 581                 return DATASOURCE_JSONP;
 582
 583         else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
 584                 return DATASOURCE_SSV;
 585
 586         else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
 587                 return DATASOURCE_CSV;
 588
 589         else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
 590                 return DATASOURCE_TSV;
 591
 592         else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
 593                 return DATASOURCE_HTML;
 594
 595         else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
 596                 return DATASOURCE_JS_ARRAY;
 597
 598         else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
 599                 return DATASOURCE_SSV_COMMA;
 600
 601         else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
 602                 return DATASOURCE_CSV_JSON_ARRAY;
 603
 604         return DATASOURCE_JSON;
 605 }
 606
 607 uint32_t web_client_api_request_v1_data_google_format(char *name)
 608 {
 609         if(!strcmp(name, "json"))
 610                 return DATASOURCE_DATATABLE_JSONP;
 611
 612         else if(!strcmp(name, "html"))
 613                 return DATASOURCE_HTML;
 614
 615         else if(!strcmp(name, "csv"))
 616                 return DATASOURCE_CSV;
 617
 618         else if(!strcmp(name, "tsv-excel"))
 619                 return DATASOURCE_TSV;
 620
 621         return DATASOURCE_JSON;
 622 }
 623
 624 int web_client_api_request_v1_data_group(char *name)
 625 {
 626         if(!strcmp(name, "max"))
 627                 return GROUP_MAX;
 628
 629         else if(!strcmp(name, "average"))
 630                 return GROUP_AVERAGE;
 631
 632         else if(!strcmp(name, "sum"))
 633                 return GROUP_SUM;
 634
 635         else if(!strcmp(name, "incremental-sum"))
 636                 return GROUP_INCREMENTAL_SUM;
 637
 638         return GROUP_AVERAGE;
 639 }
 640
 641 int web_client_api_request_v1_charts(struct web_client *w, char *url)
 642 {
 643         if(url) { ; }
 644
 645         buffer_flush(w->response.data);
 646         w->response.data->contenttype = CT_APPLICATION_JSON;
 647         rrd_stats_api_v1_charts(w->response.data);
 648         return 200;
 649 }
 650
 651 int web_client_api_request_v1_chart(struct web_client *w, char *url)
 652 {
 653         int ret = 400;
 654         char *chart = NULL;
 655
 656         buffer_flush(w->response.data);
 657
 658         while(url) {
 659                 char *value = mystrsep(&url, "?&[]");
 660                 if(!value || !*value) continue;
 661
 662                 char *name = mystrsep(&value, "=");
 663                 if(!name || !*name) continue;
 664                 if(!value || !*value) continue;
 665
 666                 // name and value are now the parameters
 667                 // they are not null and not empty
 668
 669                 if(!strcmp(name, "chart")) chart = value;
 670                 //else {
 671                 ///     buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
 672                 //      goto cleanup;
 673                 //}
 674         }
 675
 676         if(!chart || !*chart) {
 677                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 678                 goto cleanup;
 679         }
 680
 681         RRDSET *st = rrdset_find(chart);
 682         if(!st) st = rrdset_find_byname(chart);
 683         if(!st) {
 684                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 685                 ret = 404;
 686                 goto cleanup;
 687         }
 688
 689         w->response.data->contenttype = CT_APPLICATION_JSON;
 690         rrd_stats_api_v1_chart(st, w->response.data);
 691         return 200;
 692
 693 cleanup:
 694         return ret;
 695 }
 696
 697 int web_client_api_v1_badge(struct web_client *w, char *url) {
 698         // chart
 699         // dimensions
 700         // before
 701         // after
 702         // points
 703
 704         int ret = 400;
 705         buffer_flush(w->response.data);
 706
 707         BUFFER *dimensions = NULL;
 708
 709         const char *chart = NULL
 710                         , *before_str = NULL
 711                         , *after_str = NULL
 712                         , *points_str = NULL
 713                         , *multiply_str = NULL
 714                         , *divide_str = NULL
 715                         , *label = NULL
 716                         , *units = NULL
 717                         , *label_color = NULL
 718                         , *value_color = NULL;
 719
 720         int group = GROUP_AVERAGE;
 721         uint32_t options = 0x00000000;
 722
 723         while(url) {
 724                 char *value = mystrsep(&url, "/?&[]");
 725                 if(!value || !*value) continue;
 726
 727                 char *name = mystrsep(&value, "=");
 728                 if(!name || !*name) continue;
 729                 if(!value || !*value) continue;
 730
 731                 debug(D_WEB_CLIENT, "%llu: API v1 badge.svg query param '%s' with value '%s'", w->id, name, value);
 732
 733                 // name and value are now the parameters
 734                 // they are not null and not empty
 735
 736                 if(!strcmp(name, "chart")) chart = value;
 737                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 738                         if(!dimensions) dimensions = buffer_create(strlen(value));
 739                         if(dimensions) {
 740                                 buffer_strcat(dimensions, "|");
 741                                 buffer_strcat(dimensions, value);
 742                         }
 743                 }
 744                 else if(!strcmp(name, "after")) after_str = value;
 745                 else if(!strcmp(name, "before")) before_str = value;
 746                 else if(!strcmp(name, "points")) points_str = value;
 747                 else if(!strcmp(name, "group")) {
 748                         group = web_client_api_request_v1_data_group(value);
 749                 }
 750                 else if(!strcmp(name, "options")) {
 751                         options |= web_client_api_request_v1_data_options(value);
 752                 }
 753                 else if(!strcmp(name, "label")) label = value;
 754                 else if(!strcmp(name, "units")) units = value;
 755                 else if(!strcmp(name, "label_color")) label_color = value;
 756                 else if(!strcmp(name, "value_color")) value_color = value;
 757                 else if(!strcmp(name, "multiply")) multiply_str = value;
 758                 else if(!strcmp(name, "divide")) divide_str = value;
 759         }
 760
 761         if(!chart || !*chart) {
 762                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 763                 goto cleanup;
 764         }
 765
 766         RRDSET *st = rrdset_find(chart);
 767         if(!st) st = rrdset_find_byname(chart);
 768         if(!st) {
 769                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 770                 ret = 404;
 771                 goto cleanup;
 772         }
 773
 774         long long multiply = (multiply_str && *multiply_str)?atol(multiply_str):1;
 775         long long divide   = (divide_str   && *divide_str  )?atol(divide_str):1;
 776         long long before   = (before_str   && *before_str  )?atol(before_str):0;
 777         long long after    = (after_str    && *after_str   )?atol(after_str):-st->update_every;
 778         int       points   = (points_str   && *points_str  )?atoi(points_str):1;
 779
 780         if(!label) {
 781                 if(dimensions) {
 782                         const char *dim = buffer_tostring(dimensions);
 783                         if(*dim == '|') dim++;
 784                         label = dim;
 785                 }
 786                 else
 787                         label = st->name;
 788         }
 789         if(!units) {
 790                 if(options & RRDR_OPTION_PERCENTAGE)
 791                         units="%";
 792                 else
 793                         units = st->units;
 794         }
 795
 796         debug(D_WEB_CLIENT, "%llu: API command 'badge.svg' for chart '%s', dimensions '%s', after '%lld', before '%lld', points '%d', group '%u', options '0x%08x'"
 797                         , w->id
 798                         , chart
 799                         , (dimensions)?buffer_tostring(dimensions):""
 800                         , after
 801                         , before
 802                         , points
 803                         , group
 804                         , options
 805                         );
 806
 807         time_t latest_timestamp = 0;
 808         int value_is_null = 1;
 809         calculated_number n = 0;
 810         ret = 500;
 811
 812         // if the collected value is too old, don't calculate its value
 813         if(rrdset_last_entry_t(st) >= (time(NULL) - (st->update_every * st->gap_when_lost_iterations_above)))
 814                 ret = rrd2value(st, w->response.data, &n, dimensions, points, after, before, group, options, &latest_timestamp, &value_is_null);
 815
 816         // if the value cannot be calculated, show empty badge
 817         if(ret != 200) {
 818                 value_is_null = 1;
 819                 n = 0;
 820                 ret = 200;
 821         }
 822
 823         // render the badge
 824         buffer_svg(w->response.data, label, n * multiply / divide, units, label_color, value_color, value_is_null);
 825         return ret;
 826
 827 cleanup:
 828         if(dimensions) buffer_free(dimensions);
 829         return ret;
 830 }
 831
 832 // returns the HTTP code
 833 int web_client_api_request_v1_data(struct web_client *w, char *url)
 834 {
 835         debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
 836
 837         int ret = 400;
 838         BUFFER *dimensions = NULL;
 839
 840         buffer_flush(w->response.data);
 841
 842         char    *google_version = "0.6",
 843                         *google_reqId = "0",
 844                         *google_sig = "0",
 845                         *google_out = "json",
 846                         *responseHandler = NULL,
 847                         *outFileName = NULL;
 848
 849         time_t last_timestamp_in_data = 0, google_timestamp = 0;
 850
 851         char *chart = NULL
 852                         , *before_str = NULL
 853                         , *after_str = NULL
 854                         , *points_str = NULL;
 855
 856         int group = GROUP_AVERAGE;
 857         uint32_t format = DATASOURCE_JSON;
 858         uint32_t options = 0x00000000;
 859
 860         while(url) {
 861                 char *value = mystrsep(&url, "?&[]");
 862                 if(!value || !*value) continue;
 863
 864                 char *name = mystrsep(&value, "=");
 865                 if(!name || !*name) continue;
 866                 if(!value || !*value) continue;
 867
 868                 debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
 869
 870                 // name and value are now the parameters
 871                 // they are not null and not empty
 872
 873                 if(!strcmp(name, "chart")) chart = value;
 874                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 875                         if(!dimensions) dimensions = buffer_create(strlen(value));
 876                         if(dimensions) {
 877                                 buffer_strcat(dimensions, "|");
 878                                 buffer_strcat(dimensions, value);
 879                         }
 880                 }
 881                 else if(!strcmp(name, "after")) after_str = value;
 882                 else if(!strcmp(name, "before")) before_str = value;
 883                 else if(!strcmp(name, "points")) points_str = value;
 884                 else if(!strcmp(name, "group")) {
 885                         group = web_client_api_request_v1_data_group(value);
 886                 }
 887                 else if(!strcmp(name, "format")) {
 888                         format = web_client_api_request_v1_data_format(value);
 889                 }
 890                 else if(!strcmp(name, "options")) {
 891                         options |= web_client_api_request_v1_data_options(value);
 892                 }
 893                 else if(!strcmp(name, "callback")) {
 894                         responseHandler = value;
 895                 }
 896                 else if(!strcmp(name, "filename")) {
 897                         outFileName = value;
 898                 }
 899                 else if(!strcmp(name, "tqx")) {
 900                         // parse Google Visualization API options
 901                         // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
 902                         char *tqx_name, *tqx_value;
 903
 904                         while(value) {
 905                                 tqx_value = mystrsep(&value, ";");
 906                                 if(!tqx_value || !*tqx_value) continue;
 907
 908                                 tqx_name = mystrsep(&tqx_value, ":");
 909                                 if(!tqx_name || !*tqx_name) continue;
 910                                 if(!tqx_value || !*tqx_value) continue;
 911
 912                                 if(!strcmp(tqx_name, "version"))
 913                                         google_version = tqx_value;
 914                                 else if(!strcmp(tqx_name, "reqId"))
 915                                         google_reqId = tqx_value;
 916                                 else if(!strcmp(tqx_name, "sig")) {
 917                                         google_sig = tqx_value;
 918                                         google_timestamp = strtoul(google_sig, NULL, 0);
 919                                 }
 920                                 else if(!strcmp(tqx_name, "out")) {
 921                                         google_out = tqx_value;
 922                                         format = web_client_api_request_v1_data_google_format(google_out);
 923                                 }
 924                                 else if(!strcmp(tqx_name, "responseHandler"))
 925                                         responseHandler = tqx_value;
 926                                 else if(!strcmp(tqx_name, "outFileName"))
 927                                         outFileName = tqx_value;
 928                         }
 929                 }
 930         }
 931
 932         if(!chart || !*chart) {
 933                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 934                 goto cleanup;
 935         }
 936
 937         RRDSET *st = rrdset_find(chart);
 938         if(!st) st = rrdset_find_byname(chart);
 939         if(!st) {
 940                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 941                 ret = 404;
 942                 goto cleanup;
 943         }
 944
 945         long long before = (before_str && *before_str)?atol(before_str):0;
 946         long long after  = (after_str  && *after_str) ?atol(after_str):0;
 947         int       points = (points_str && *points_str)?atoi(points_str):0;
 948
 949         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'"
 950                         , w->id
 951                         , chart
 952                         , (dimensions)?buffer_tostring(dimensions):""
 953                         , after
 954                         , before
 955                         , points
 956                         , group
 957                         , format
 958                         , options
 959                         );
 960
 961         if(outFileName && *outFileName) {
 962                 buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
 963                 debug(D_WEB_CLIENT, "%llu: generating outfilename header: '%s'", w->id, outFileName);
 964         }
 965
 966         if(format == DATASOURCE_DATATABLE_JSONP) {
 967                 if(responseHandler == NULL)
 968                         responseHandler = "google.visualization.Query.setResponse";
 969
 970                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 971                                 w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
 972                         );
 973
 974                 buffer_sprintf(w->response.data,
 975                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 976                         responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
 977         }
 978         else if(format == DATASOURCE_JSONP) {
 979                 if(responseHandler == NULL)
 980                         responseHandler = "callback";
 981
 982                 buffer_strcat(w->response.data, responseHandler);
 983                 buffer_strcat(w->response.data, "(");
 984         }
 985
 986         ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
 987
 988         if(format == DATASOURCE_DATATABLE_JSONP) {
 989                 if(google_timestamp < last_timestamp_in_data)
 990                         buffer_strcat(w->response.data, "});");
 991
 992                 else {
 993                         // the client already has the latest data
 994                         buffer_flush(w->response.data);
 995                         buffer_sprintf(w->response.data,
 996                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
 997                                 responseHandler, google_version, google_reqId);
 998                 }
 999         }
1000         else if(format == DATASOURCE_JSONP)
1001                 buffer_strcat(w->response.data, ");");
1002
1003 cleanup:
1004         if(dimensions) buffer_free(dimensions);
1005         return ret;
1006 }
1007
1008 int web_client_api_request_v1_registry(struct web_client *w, char *url)
1009 {
1010         static uint32_t hash_action = 0, hash_access = 0, hash_hello = 0, hash_delete = 0, hash_search = 0,
1011                         hash_switch = 0, hash_machine = 0, hash_url = 0, hash_name = 0, hash_delete_url = 0, hash_for = 0,
1012                         hash_to = 0 /*, hash_redirects = 0 */;
1013
1014         if(unlikely(!hash_action)) {
1015                 hash_action = simple_hash("action");
1016                 hash_access = simple_hash("access");
1017                 hash_hello = simple_hash("hello");
1018                 hash_delete = simple_hash("delete");
1019                 hash_search = simple_hash("search");
1020                 hash_switch = simple_hash("switch");
1021                 hash_machine = simple_hash("machine");
1022                 hash_url = simple_hash("url");
1023                 hash_name = simple_hash("name");
1024                 hash_delete_url = simple_hash("delete_url");
1025                 hash_for = simple_hash("for");
1026                 hash_to = simple_hash("to");
1027 /*
1028                 hash_redirects = simple_hash("redirects");
1029 */
1030         }
1031
1032         char person_guid[36 + 1] = "";
1033
1034         debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
1035
1036         // FIXME
1037         // The browser may send multiple cookies with our id
1038
1039         char *cookie = strstr(w->response.data->buffer, NETDATA_REGISTRY_COOKIE_NAME "=");
1040         if(cookie)
1041                 strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME)], 36);
1042
1043         char action = '\0';
1044         char *machine_guid = NULL,
1045                         *machine_url = NULL,
1046                         *url_name = NULL,
1047                         *search_machine_guid = NULL,
1048                         *delete_url = NULL,
1049                         *to_person_guid = NULL;
1050 /*
1051         int redirects = 0;
1052 */
1053
1054         while(url) {
1055                 char *value = mystrsep(&url, "?&[]");
1056                 if (!value || !*value) continue;
1057
1058                 char *name = mystrsep(&value, "=");
1059                 if (!name || !*name) continue;
1060                 if (!value || !*value) continue;
1061
1062                 debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
1063
1064                 uint32_t hash = simple_hash(name);
1065
1066                 if(hash == hash_action && !strcmp(name, "action")) {
1067                         uint32_t vhash = simple_hash(value);
1068
1069                         if(vhash == hash_access && !strcmp(value, "access")) action = 'A';
1070                         else if(vhash == hash_hello && !strcmp(value, "hello")) action = 'H';
1071                         else if(vhash == hash_delete && !strcmp(value, "delete")) action = 'D';
1072                         else if(vhash == hash_search && !strcmp(value, "search")) action = 'S';
1073                         else if(vhash == hash_switch && !strcmp(value, "switch")) action = 'W';
1074 #ifdef NETDATA_INTERNAL_CHECKS
1075             else error("unknown registry action '%s'", value);
1076 #endif /* NETDATA_INTERNAL_CHECKS */
1077                 }
1078 /*
1079                 else if(hash == hash_redirects && !strcmp(name, "redirects"))
1080                         redirects = atoi(value);
1081 */
1082                 else if(hash == hash_machine && !strcmp(name, "machine"))
1083                         machine_guid = value;
1084
1085                 else if(hash == hash_url && !strcmp(name, "url"))
1086                         machine_url = value;
1087
1088                 else if(action == 'A') {
1089                         if(hash == hash_name && !strcmp(name, "name"))
1090                                 url_name = value;
1091                 }
1092                 else if(action == 'D') {
1093                         if(hash == hash_delete_url && !strcmp(name, "delete_url"))
1094                                 delete_url = value;
1095                 }
1096                 else if(action == 'S') {
1097                         if(hash == hash_for && !strcmp(name, "for"))
1098                                 search_machine_guid = value;
1099                 }
1100                 else if(action == 'W') {
1101                         if(hash == hash_to && !strcmp(name, "to"))
1102                                 to_person_guid = value;
1103                 }
1104 #ifdef NETDATA_INTERNAL_CHECKS
1105                 else error("unused registry URL parameter '%s' with value '%s'", name, value);
1106 #endif /* NETDATA_INTERNAL_CHECKS */
1107         }
1108
1109         if(web_donotrack_comply && w->donottrack) {
1110                 buffer_flush(w->response.data);
1111                 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.");
1112                 return 400;
1113         }
1114
1115         if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
1116                 buffer_flush(w->response.data);
1117                 buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
1118                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
1119                 return 400;
1120         }
1121         else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
1122                 buffer_flush(w->response.data);
1123                 buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
1124                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
1125                 return 400;
1126         }
1127         else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
1128                 buffer_flush(w->response.data);
1129                 buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
1130                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
1131                 return 400;
1132         }
1133         else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
1134                 buffer_flush(w->response.data);
1135                 buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
1136                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
1137                 return 400;
1138         }
1139
1140         switch(action) {
1141                 case 'A':
1142                         w->tracking_required = 1;
1143                         if(registry_verify_cookies_redirects() > 0 && (!cookie || !person_guid[0])) {
1144                                 buffer_flush(w->response.data);
1145
1146                                 registry_set_cookie(w, "give-me-back-this-cookie-please");
1147                                 w->response.data->contenttype = CT_APPLICATION_JSON;
1148                                 buffer_sprintf(w->response.data, "{ \"status\": \"redirect\", \"registry\": \"%s\" }", registry_to_announce());
1149                                 return 200;
1150
1151 /*
1152  * it seems that web browsers are ignoring 307 (Moved Temporarily)
1153  * under certain conditions, when using CORS
1154  * so this is commented and we use application level redirects instead
1155  *
1156                                 redirects++;
1157
1158                                 if(redirects > registry_verify_cookies_redirects()) {
1159                                         buffer_flush(w->response.data);
1160                                         buffer_sprintf(w->response.data, "Your browser does not support cookies");
1161                                         return 400;
1162                                 }
1163
1164                                 char *encoded_url = url_encode(machine_url);
1165                                 if(!encoded_url) {
1166                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_url);
1167                                         return 500;
1168                                 }
1169
1170                                 char *encoded_name = url_encode(url_name);
1171                                 if(!encoded_name) {
1172                                         free(encoded_url);
1173                                         error("%llu: Cannot URL encode string '%s'", w->id, url_name);
1174                                         return 500;
1175                                 }
1176
1177                                 char *encoded_guid = url_encode(machine_guid);
1178                                 if(!encoded_guid) {
1179                                         free(encoded_url);
1180                                         free(encoded_name);
1181                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_guid);
1182                                         return 500;
1183                                 }
1184
1185                                 buffer_sprintf(w->response.header, "Location: %s/api/v1/registry?action=access&machine=%s&name=%s&url=%s&redirects=%d\r\n",
1186                                                            registry_to_announce(), encoded_guid, encoded_name, encoded_url, redirects);
1187
1188                                 free(encoded_guid);
1189                                 free(encoded_name);
1190                                 free(encoded_url);
1191                                 return 307
1192 */
1193                         }
1194                         return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
1195
1196                 case 'D':
1197                         w->tracking_required = 1;
1198                         return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
1199
1200                 case 'S':
1201                         w->tracking_required = 1;
1202                         return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
1203
1204                 case 'W':
1205                         w->tracking_required = 1;
1206                         return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
1207
1208                 case 'H':
1209                         return registry_request_hello_json(w);
1210
1211                 default:
1212                         buffer_flush(w->response.data);
1213                         buffer_sprintf(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
1214                         return 400;
1215         }
1216
1217         buffer_flush(w->response.data);
1218         buffer_sprintf(w->response.data, "Invalid or no registry action.");
1219         return 400;
1220 }
1221
1222 int web_client_api_request_v1(struct web_client *w, char *url) {
1223         static uint32_t hash_data = 0, hash_chart = 0, hash_charts = 0, hash_registry = 0, hash_badge = 0;
1224
1225         if(unlikely(hash_data == 0)) {
1226                 hash_data = simple_hash("data");
1227                 hash_chart = simple_hash("chart");
1228                 hash_charts = simple_hash("charts");
1229                 hash_registry = simple_hash("registry");
1230                 hash_badge = simple_hash("badge.svg");
1231         }
1232
1233         // get the command
1234         char *tok = mystrsep(&url, "/?&");
1235         if(tok && *tok) {
1236                 debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
1237                 uint32_t hash = simple_hash(tok);
1238
1239                 if(hash == hash_data && !strcmp(tok, "data"))
1240                         return web_client_api_request_v1_data(w, url);
1241
1242                 else if(hash == hash_chart && !strcmp(tok, "chart"))
1243                         return web_client_api_request_v1_chart(w, url);
1244
1245                 else if(hash == hash_charts && !strcmp(tok, "charts"))
1246                         return web_client_api_request_v1_charts(w, url);
1247
1248                 else if(hash == hash_registry && !strcmp(tok, "registry"))
1249                         return web_client_api_request_v1_registry(w, url);
1250
1251                 else if(hash == hash_badge && !strcmp(tok, "badge.svg"))
1252                         return web_client_api_v1_badge(w, url);
1253
1254                 else {
1255                         buffer_flush(w->response.data);
1256                         buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
1257                         return 404;
1258                 }
1259         }
1260         else {
1261                 buffer_flush(w->response.data);
1262                 buffer_sprintf(w->response.data, "API v1 command?");
1263                 return 400;
1264         }
1265 }
1266
1267 int web_client_api_request(struct web_client *w, char *url)
1268 {
1269         // get the api version
1270         char *tok = mystrsep(&url, "/?&");
1271         if(tok && *tok) {
1272                 debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
1273                 if(strcmp(tok, "v1") == 0)
1274                         return web_client_api_request_v1(w, url);
1275                 else {
1276                         buffer_flush(w->response.data);
1277                         buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
1278                         return 404;
1279                 }
1280         }
1281         else {
1282                 buffer_flush(w->response.data);
1283                 buffer_sprintf(w->response.data, "Which API version?");
1284                 return 400;
1285         }
1286 }
1287
1288 int web_client_api_old_data_request(struct web_client *w, char *url, int datasource_type)
1289 {
1290         RRDSET *st = NULL;
1291
1292         char *args = strchr(url, '?');
1293         if(args) {
1294                 *args='\0';
1295                 args = &args[1];
1296         }
1297
1298         // get the name of the data to show
1299         char *tok = mystrsep(&url, "/");
1300
1301         // do we have such a data set?
1302         if(tok && *tok) {
1303                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1304                 st = rrdset_find_byname(tok);
1305                 if(!st) st = rrdset_find(tok);
1306         }
1307
1308         if(!st) {
1309                 // we don't have it
1310                 // try to send a file with that name
1311                 buffer_flush(w->response.data);
1312                 return(mysendfile(w, tok));
1313         }
1314
1315         // we have it
1316         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
1317
1318         // how many entries does the client want?
1319         long lines = rrd_default_history_entries;
1320         long group_count = 1;
1321         time_t after = 0, before = 0;
1322         int group_method = GROUP_AVERAGE;
1323         int nonzero = 0;
1324
1325         if(url) {
1326                 // parse the lines required
1327                 tok = mystrsep(&url, "/");
1328                 if(tok) lines = atoi(tok);
1329                 if(lines < 1) lines = 1;
1330         }
1331         if(url) {
1332                 // parse the group count required
1333                 tok = mystrsep(&url, "/");
1334                 if(tok && *tok) group_count = atoi(tok);
1335                 if(group_count < 1) group_count = 1;
1336                 //if(group_count > save_history / 20) group_count = save_history / 20;
1337         }
1338         if(url) {
1339                 // parse the grouping method required
1340                 tok = mystrsep(&url, "/");
1341                 if(tok && *tok) {
1342                         if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
1343                         else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
1344                         else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
1345                         else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
1346                 }
1347         }
1348         if(url) {
1349                 // parse after time
1350                 tok = mystrsep(&url, "/");
1351                 if(tok && *tok) after = strtoul(tok, NULL, 10);
1352                 if(after < 0) after = 0;
1353         }
1354         if(url) {
1355                 // parse before time
1356                 tok = mystrsep(&url, "/");
1357                 if(tok && *tok) before = strtoul(tok, NULL, 10);
1358                 if(before < 0) before = 0;
1359         }
1360         if(url) {
1361                 // parse nonzero
1362                 tok = mystrsep(&url, "/");
1363                 if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
1364         }
1365
1366         w->response.data->contenttype = CT_APPLICATION_JSON;
1367         buffer_flush(w->response.data);
1368
1369         char *google_version = "0.6";
1370         char *google_reqId = "0";
1371         char *google_sig = "0";
1372         char *google_out = "json";
1373         char *google_responseHandler = "google.visualization.Query.setResponse";
1374         char *google_outFileName = NULL;
1375         time_t last_timestamp_in_data = 0;
1376         if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
1377
1378                 w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1379
1380                 while(args) {
1381                         tok = mystrsep(&args, "&");
1382                         if(tok && *tok) {
1383                                 char *name = mystrsep(&tok, "=");
1384                                 if(name && *name && strcmp(name, "tqx") == 0) {
1385                                         char *key = mystrsep(&tok, ":");
1386                                         char *value = mystrsep(&tok, ";");
1387                                         if(key && value && *key && *value) {
1388                                                 if(strcmp(key, "version") == 0)
1389                                                         google_version = value;
1390
1391                                                 else if(strcmp(key, "reqId") == 0)
1392                                                         google_reqId = value;
1393
1394                                                 else if(strcmp(key, "sig") == 0)
1395                                                         google_sig = value;
1396
1397                                                 else if(strcmp(key, "out") == 0)
1398                                                         google_out = value;
1399
1400                                                 else if(strcmp(key, "responseHandler") == 0)
1401                                                         google_responseHandler = value;
1402
1403                                                 else if(strcmp(key, "outFileName") == 0)
1404                                                         google_outFileName = value;
1405                                         }
1406                                 }
1407                         }
1408                 }
1409
1410                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
1411                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
1412                         );
1413
1414                 if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1415                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
1416
1417                         // check the client wants json
1418                         if(strcmp(google_out, "json") != 0) {
1419                                 buffer_sprintf(w->response.data,
1420                                         "%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.'}]});",
1421                                         google_responseHandler, google_version, google_reqId, google_out);
1422                                         return 200;
1423                         }
1424                 }
1425         }
1426
1427         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1428                 buffer_sprintf(w->response.data,
1429                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
1430                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1431         }
1432
1433         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);
1434         time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, after, before, nonzero);
1435
1436         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1437                 if(timestamp_in_data > last_timestamp_in_data)
1438                         buffer_strcat(w->response.data, "});");
1439
1440                 else {
1441                         // the client already has the latest data
1442                         buffer_flush(w->response.data);
1443                         buffer_sprintf(w->response.data,
1444                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1445                                 google_responseHandler, google_version, google_reqId);
1446                 }
1447         }
1448
1449         return 200;
1450 }
1451
1452 const char *web_content_type_to_string(uint8_t contenttype) {
1453         switch(contenttype) {
1454                 case CT_TEXT_HTML:
1455                         return "text/html; charset=utf-8";
1456
1457                 case CT_APPLICATION_XML:
1458                         return "application/xml; charset=utf-8";
1459
1460                 case CT_APPLICATION_JSON:
1461                         return "application/json; charset=utf-8";
1462
1463                 case CT_APPLICATION_X_JAVASCRIPT:
1464                         return "application/x-javascript; charset=utf-8";
1465
1466                 case CT_TEXT_CSS:
1467                         return "text/css; charset=utf-8";
1468
1469                 case CT_TEXT_XML:
1470                         return "text/xml; charset=utf-8";
1471
1472                 case CT_TEXT_XSL:
1473                         return "text/xsl; charset=utf-8";
1474
1475                 case CT_APPLICATION_OCTET_STREAM:
1476                         return "application/octet-stream";
1477
1478                 case CT_IMAGE_SVG_XML:
1479                         return "image/svg+xml";
1480
1481                 case CT_APPLICATION_X_FONT_TRUETYPE:
1482                         return "application/x-font-truetype";
1483
1484                 case CT_APPLICATION_X_FONT_OPENTYPE:
1485                         return "application/x-font-opentype";
1486
1487                 case CT_APPLICATION_FONT_WOFF:
1488                         return "application/font-woff";
1489
1490                 case CT_APPLICATION_FONT_WOFF2:
1491                         return "application/font-woff2";
1492
1493                 case CT_APPLICATION_VND_MS_FONTOBJ:
1494                         return "application/vnd.ms-fontobject";
1495
1496                 case CT_IMAGE_PNG:
1497                         return "image/png";
1498
1499                 case CT_IMAGE_JPG:
1500                         return "image/jpeg";
1501
1502                 case CT_IMAGE_GIF:
1503                         return "image/gif";
1504
1505                 case CT_IMAGE_XICON:
1506                         return "image/x-icon";
1507
1508                 case CT_IMAGE_BMP:
1509                         return "image/bmp";
1510
1511                 case CT_IMAGE_ICNS:
1512                         return "image/icns";
1513
1514                 default:
1515                 case CT_TEXT_PLAIN:
1516                         return "text/plain; charset=utf-8";
1517         }
1518 }
1519
1520
1521 const char *web_response_code_to_string(int code) {
1522         switch(code) {
1523                 case 200:
1524                         return "OK";
1525
1526                 case 307:
1527                         return "Temporary Redirect";
1528
1529                 case 400:
1530                         return "Bad Request";
1531
1532                 case 403:
1533                         return "Forbidden";
1534
1535                 case 404:
1536                         return "Not Found";
1537
1538                 case 412:
1539                         return "Preconditions Failed";
1540
1541                 default:
1542                         if(code >= 100 && code < 200)
1543                                 return "Informational";
1544
1545                         if(code >= 200 && code < 300)
1546                                 return "Successful";
1547
1548                         if(code >= 300 && code < 400)
1549                                 return "Redirection";
1550
1551                         if(code >= 400 && code < 500)
1552                                 return "Bad Request";
1553
1554                         if(code >= 500 && code < 600)
1555                                 return "Server Error";
1556
1557                         return "Undefined Error";
1558         }
1559 }
1560
1561 static inline char *http_header_parse(struct web_client *w, char *s) {
1562         static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0;
1563
1564         if(unlikely(!hash_origin)) {
1565                 hash_origin = simple_uhash("Origin");
1566                 hash_connection = simple_uhash("Connection");
1567                 hash_accept_encoding = simple_uhash("Accept-Encoding");
1568                 hash_donottrack = simple_uhash("DNT");
1569         }
1570
1571         char *e = s;
1572
1573         // find the :
1574         while(*e && *e != ':') e++;
1575         if(!*e) return e;
1576
1577         // get the name
1578         *e = '\0';
1579
1580         // find the value
1581         char *v = e + 1, *ve;
1582
1583         // skip leading spaces from value
1584         while(*v == ' ') v++;
1585         ve = v;
1586
1587         // find the \r
1588         while(*ve && *ve != '\r') ve++;
1589         if(!*ve || ve[1] != '\n') {
1590                 *e = ':';
1591                 return ve;
1592         }
1593
1594         // terminate the value
1595         *ve = '\0';
1596
1597         // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
1598         uint32_t hash = simple_uhash(s);
1599
1600         if(hash == hash_origin && !strcasecmp(s, "Origin"))
1601                 strncpyz(w->origin, v, ORIGIN_MAX);
1602
1603         else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
1604                 if(strcasestr(v, "keep-alive"))
1605                         w->keepalive = 1;
1606         }
1607         else if(web_donotrack_comply && hash == hash_donottrack && !strcasecmp(s, "DNT")) {
1608                 if(*v == '0') w->donottrack = 0;
1609                 else if(*v == '1') w->donottrack = 1;
1610         }
1611 #ifdef NETDATA_WITH_ZLIB
1612         else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
1613                 if(web_enable_gzip) {
1614                         if(strcasestr(v, "gzip"))
1615                                 web_client_enable_deflate(w, 1);
1616                         //
1617                         // does not seem to work
1618                         // else if(strcasestr(v, "deflate"))
1619                         //      web_client_enable_deflate(w, 0);
1620                 }
1621         }
1622 #endif /* NETDATA_WITH_ZLIB */
1623
1624         *e = ':';
1625         *ve = '\r';
1626         return ve;
1627 }
1628
1629 // http_request_validate()
1630 // returns:
1631 // = 0 : all good, process the request
1632 // > 0 : request is not supported
1633 // < 0 : request is incomplete - wait for more data
1634
1635 static inline int http_request_validate(struct web_client *w) {
1636         char *s = w->response.data->buffer, *encoded_url = NULL;
1637
1638         // is is a valid request?
1639         if(!strncmp(s, "GET ", 4)) {
1640                 encoded_url = s = &s[4];
1641                 w->mode = WEB_CLIENT_MODE_NORMAL;
1642         }
1643         else if(!strncmp(s, "OPTIONS ", 8)) {
1644                 encoded_url = s = &s[8];
1645                 w->mode = WEB_CLIENT_MODE_OPTIONS;
1646         }
1647         else {
1648                 w->wait_receive = 0;
1649                 return 1;
1650         }
1651
1652         // find the SPACE + "HTTP/"
1653         while(*s) {
1654                 // find the next space
1655                 while (*s && *s != ' ') s++;
1656
1657                 // is it SPACE + "HTTP/" ?
1658                 if(*s && !strncmp(s, " HTTP/", 6)) break;
1659                 else s++;
1660         }
1661
1662         // incomplete requests
1663         if(unlikely(!*s)) {
1664                 w->wait_receive = 1;
1665                 return -2;
1666         }
1667
1668         // we have the end of encoded_url - remember it
1669         char *ue = s;
1670
1671         // make sure we have complete request
1672         // complete requests contain: \r\n\r\n
1673         while(*s) {
1674                 // find a line feed
1675                 while(*s && *s++ != '\r');
1676
1677                 // did we reach the end?
1678                 if(unlikely(!*s)) break;
1679
1680                 // is it \r\n ?
1681                 if(likely(*s++ == '\n')) {
1682
1683                         // is it again \r\n ? (header end)
1684                         if(unlikely(*s == '\r' && s[1] == '\n')) {
1685                                 // a valid complete HTTP request found
1686
1687                                 *ue = '\0';
1688                                 url_decode_r(w->decoded_url, encoded_url, URL_MAX + 1);
1689                                 *ue = ' ';
1690
1691                                 // copy the URL - we are going to overwrite parts of it
1692                                 // FIXME -- we should avoid it
1693                                 strncpyz(w->last_url, w->decoded_url, URL_MAX);
1694
1695                                 w->wait_receive = 0;
1696                                 return 0;
1697                         }
1698
1699                         // another header line
1700                         s = http_header_parse(w, s);
1701                 }
1702         }
1703
1704         // incomplete request
1705         w->wait_receive = 1;
1706         return -3;
1707 }
1708
1709 void web_client_process(struct web_client *w) {
1710         static uint32_t hash_api = 0, hash_netdata_conf = 0, hash_data = 0, hash_datasource = 0, hash_graph = 0,
1711                         hash_list = 0, hash_all_json = 0, hash_exit = 0, hash_debug = 0, hash_mirror = 0;
1712
1713         if(unlikely(!hash_api)) {
1714                 hash_api = simple_hash("api");
1715                 hash_netdata_conf = simple_hash("netdata.conf");
1716                 hash_data = simple_hash(WEB_PATH_DATA);
1717                 hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
1718                 hash_graph = simple_hash(WEB_PATH_GRAPH);
1719                 hash_list = simple_hash("list");
1720                 hash_all_json = simple_hash("all.json");
1721                 hash_exit = simple_hash("exit");
1722                 hash_debug = simple_hash("debug");
1723                 hash_mirror = simple_hash("mirror");
1724         }
1725
1726         int code = 500;
1727         ssize_t bytes;
1728
1729         int what_to_do = http_request_validate(w);
1730
1731         // wait for more data
1732         if(what_to_do < 0) {
1733                 if(w->response.data->len > TOO_BIG_REQUEST) {
1734                         strcpy(w->last_url, "too big request");
1735
1736                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
1737
1738                         code = 400;
1739                         buffer_flush(w->response.data);
1740                         buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
1741                 }
1742                 else {
1743                         // wait for more data
1744                         return;
1745                 }
1746         }
1747         else if(what_to_do > 0) {
1748                 strcpy(w->last_url, "not a valid request");
1749
1750                 debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
1751
1752                 code = 500;
1753                 buffer_flush(w->response.data);
1754                 buffer_strcat(w->response.data, "I don't understand you...\r\n");
1755         }
1756         else { // what_to_do == 0
1757                 gettimeofday(&w->tv_in, NULL);
1758
1759                 if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1760                         code = 200;
1761                         w->response.data->contenttype = CT_TEXT_PLAIN;
1762                         buffer_flush(w->response.data);
1763                         buffer_strcat(w->response.data, "OK");
1764                 }
1765                 else {
1766                         char *url = w->decoded_url;
1767                         char *tok = mystrsep(&url, "/?");
1768                         if(tok && *tok) {
1769                                 uint32_t hash = simple_hash(tok);
1770                                 debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
1771
1772                                 if(hash == hash_api && strcmp(tok, "api") == 0) {
1773                                         // the client is requesting api access
1774                                         code = web_client_api_request(w, url);
1775                                 }
1776                                 else if(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0) {
1777                                         code = 200;
1778                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
1779
1780                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1781                                         buffer_flush(w->response.data);
1782                                         generate_config(w->response.data, 0);
1783                                 }
1784                                 else if(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
1785                                         // the client is requesting rrd data -- OLD API
1786                                         code = web_client_api_old_data_request(w, url, DATASOURCE_JSON);
1787                                 }
1788                                 else if(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
1789                                         // the client is requesting google datasource -- OLD API
1790                                         code = web_client_api_old_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
1791                                 }
1792                                 else if(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
1793                                         // the client is requesting an rrd graph -- OLD API
1794
1795                                         // get the name of the data to show
1796                                         tok = mystrsep(&url, "/?&");
1797                                         if(tok && *tok) {
1798                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1799
1800                                                 // do we have such a data set?
1801                                                 RRDSET *st = rrdset_find_byname(tok);
1802                                                 if(!st) st = rrdset_find(tok);
1803                                                 if(!st) {
1804                                                         // we don't have it
1805                                                         // try to send a file with that name
1806                                                         buffer_flush(w->response.data);
1807                                                         code = mysendfile(w, tok);
1808                                                 }
1809                                                 else {
1810                                                         code = 200;
1811                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
1812                                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1813                                                         buffer_flush(w->response.data);
1814                                                         rrd_stats_graph_json(st, url, w->response.data);
1815                                                 }
1816                                         }
1817                                         else {
1818                                                 code = 400;
1819                                                 buffer_flush(w->response.data);
1820                                                 buffer_strcat(w->response.data, "Graph name?\r\n");
1821                                         }
1822                                 }
1823                                 else if(hash == hash_list && strcmp(tok, "list") == 0) {
1824                                         // OLD API
1825                                         code = 200;
1826
1827                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
1828
1829                                         buffer_flush(w->response.data);
1830                                         RRDSET *st = rrdset_root;
1831
1832                                         for ( ; st ; st = st->next )
1833                                                 buffer_sprintf(w->response.data, "%s\n", st->name);
1834                                 }
1835                                 else if(hash == hash_all_json && strcmp(tok, "all.json") == 0) {
1836                                         // OLD API
1837                                         code = 200;
1838                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
1839
1840                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1841                                         buffer_flush(w->response.data);
1842                                         rrd_stats_all_json(w->response.data);
1843                                 }
1844 #ifdef NETDATA_INTERNAL_CHECKS
1845                                 else if(hash == hash_exit && strcmp(tok, "exit") == 0) {
1846                                         code = 200;
1847                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1848                                         buffer_flush(w->response.data);
1849
1850                                         if(!netdata_exit)
1851                                                 buffer_strcat(w->response.data, "ok, will do...");
1852                                         else
1853                                                 buffer_strcat(w->response.data, "I am doing it already");
1854
1855                                         netdata_exit = 1;
1856                                 }
1857                                 else if(hash == hash_debug && strcmp(tok, "debug") == 0) {
1858                                         buffer_flush(w->response.data);
1859
1860                                         // get the name of the data to show
1861                                         tok = mystrsep(&url, "/?&");
1862                                         if(tok && *tok) {
1863                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1864
1865                                                 // do we have such a data set?
1866                                                 RRDSET *st = rrdset_find_byname(tok);
1867                                                 if(!st) st = rrdset_find(tok);
1868                                                 if(!st) {
1869                                                         code = 404;
1870                                                         buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
1871                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
1872                                                 }
1873                                                 else {
1874                                                         code = 200;
1875                                                         debug_flags |= D_RRD_STATS;
1876                                                         st->debug = !st->debug;
1877                                                         buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
1878                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
1879                                                 }
1880                                         }
1881                                         else {
1882                                                 code = 500;
1883                                                 buffer_flush(w->response.data);
1884                                                 buffer_strcat(w->response.data, "debug which chart?\r\n");
1885                                         }
1886                                 }
1887                                 else if(hash == hash_mirror && strcmp(tok, "mirror") == 0) {
1888                                         code = 200;
1889
1890                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
1891
1892                                         // replace the zero bytes with spaces
1893                                         buffer_char_replace(w->response.data, '\0', ' ');
1894
1895                                         // just leave the buffer as is
1896                                         // it will be copied back to the client
1897                                 }
1898 #endif  /* NETDATA_INTERNAL_CHECKS */
1899                                 else {
1900                                         char filename[FILENAME_MAX+1];
1901                                         url = filename;
1902                                         strncpyz(filename, w->last_url, FILENAME_MAX);
1903                                         tok = mystrsep(&url, "?");
1904                                         buffer_flush(w->response.data);
1905                                         code = mysendfile(w, (tok && *tok)?tok:"/");
1906                                 }
1907                         }
1908                         else {
1909                                 char filename[FILENAME_MAX+1];
1910                                 url = filename;
1911                                 strncpyz(filename, w->last_url, FILENAME_MAX);
1912                                 tok = mystrsep(&url, "?");
1913                                 buffer_flush(w->response.data);
1914                                 code = mysendfile(w, (tok && *tok)?tok:"/");
1915                         }
1916                 }
1917         }
1918
1919         gettimeofday(&w->tv_ready, NULL);
1920         w->response.data->date = time(NULL);
1921         w->response.sent = 0;
1922         w->response.code = code;
1923
1924         // prepare the HTTP response header
1925         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
1926
1927         const char *content_type_string = web_content_type_to_string(w->response.data->contenttype);
1928         const char *code_msg = web_response_code_to_string(code);
1929
1930         char date[100];
1931         struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
1932         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
1933
1934         buffer_sprintf(w->response.header_output,
1935                 "HTTP/1.1 %d %s\r\n"
1936                 "Connection: %s\r\n"
1937                 "Server: NetData Embedded HTTP Server\r\n"
1938                 "Access-Control-Allow-Origin: %s\r\n"
1939                 "Access-Control-Allow-Credentials: true\r\n"
1940                 "Content-Type: %s\r\n"
1941                 "Date: %s\r\n"
1942                 , code, code_msg
1943                 , w->keepalive?"keep-alive":"close"
1944                 , w->origin
1945                 , content_type_string
1946                 , date
1947                 );
1948
1949         if(w->cookie1[0] || w->cookie2[0]) {
1950                 if(w->cookie1[0]) {
1951                         buffer_sprintf(w->response.header_output,
1952                            "Set-Cookie: %s\r\n",
1953                            w->cookie1);
1954                 }
1955
1956                 if(w->cookie2[0]) {
1957                         buffer_sprintf(w->response.header_output,
1958                            "Set-Cookie: %s\r\n",
1959                            w->cookie2);
1960                 }
1961
1962                 if(web_donotrack_comply)
1963                         buffer_sprintf(w->response.header_output,
1964                            "Tk: T;cookies\r\n");
1965         }
1966         else {
1967                 if(web_donotrack_comply) {
1968                         if(w->tracking_required)
1969                                 buffer_sprintf(w->response.header_output,
1970                                    "Tk: T;cookies\r\n");
1971                         else
1972                                 buffer_sprintf(w->response.header_output,
1973                                    "Tk: N\r\n");
1974                 }
1975         }
1976
1977         if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1978                 buffer_strcat(w->response.header_output,
1979                         "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
1980                         "Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
1981                         "Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
1982                         );
1983         }
1984
1985         if(buffer_strlen(w->response.header))
1986                 buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
1987
1988         if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
1989                 buffer_sprintf(w->response.header_output,
1990                         "Expires: %s\r\n"
1991                         "Cache-Control: no-cache\r\n"
1992                         , date);
1993         }
1994         else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
1995                 char edate[100];
1996                 time_t et = w->response.data->date + (86400 * 14);
1997                 struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
1998                 strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
1999
2000                 buffer_sprintf(w->response.header_output,
2001                         "Expires: %s\r\n"
2002                         "Cache-Control: public\r\n"
2003                         , edate);
2004         }
2005
2006         // if we know the content length, put it
2007         if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
2008                 buffer_sprintf(w->response.header_output,
2009                         "Content-Length: %ld\r\n"
2010                         , w->response.data->len? w->response.data->len: w->response.rlen
2011                         );
2012         else if(!w->response.zoutput)
2013                 w->keepalive = 0;       // content-length is required for keep-alive
2014
2015         if(w->response.zoutput) {
2016                 buffer_strcat(w->response.header_output,
2017                         "Content-Encoding: gzip\r\n"
2018                         "Transfer-Encoding: chunked\r\n"
2019                         );
2020         }
2021
2022         buffer_strcat(w->response.header_output, "\r\n");
2023
2024         // sent the HTTP header
2025         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
2026                         , w->id
2027                         , buffer_strlen(w->response.header_output)
2028                         , buffer_tostring(w->response.header_output)
2029                         );
2030
2031         web_client_crock_socket(w);
2032
2033         bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
2034         if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
2035                 if(bytes > 0)
2036                         w->stats_sent_bytes += bytes;
2037
2038                 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,
2039                           buffer_strlen(w->response.header_output), bytes);
2040
2041                 WEB_CLIENT_IS_DEAD(w);
2042                 return;
2043         }
2044         else
2045                 w->stats_sent_bytes += bytes;
2046
2047         // enable sending immediately if we have data
2048         if(w->response.data->len) w->wait_send = 1;
2049         else w->wait_send = 0;
2050
2051         // pretty logging
2052         switch(w->mode) {
2053                 case WEB_CLIENT_MODE_OPTIONS:
2054                         debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2055                         break;
2056
2057                 case WEB_CLIENT_MODE_NORMAL:
2058                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2059                         break;
2060
2061                 case WEB_CLIENT_MODE_FILECOPY:
2062                         if(w->response.rlen) {
2063                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
2064                                 w->wait_receive = 1;
2065
2066                                 /*
2067                                 // utilize the kernel sendfile() for copying the file to the socket.
2068                                 // this block of code can be commented, without anything missing.
2069                                 // when it is commented, the program will copy the data using async I/O.
2070                                 {
2071                                         long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
2072                                         if(len != w->response.data->rbytes)
2073                                                 error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
2074                                         else
2075                                                 web_client_reset(w);
2076                                 }
2077                                 */
2078                         }
2079                         else
2080                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
2081                         break;
2082
2083                 default:
2084                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
2085                         break;
2086         }
2087 }
2088
2089 ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
2090 {
2091         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
2092         char buf[1024];
2093         sprintf(buf, "%zX\r\n", len);
2094
2095         ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
2096         if(bytes > 0) {
2097                 debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
2098                 w->stats_sent_bytes += bytes;
2099         }
2100
2101         else if(bytes == 0) {
2102                 debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
2103                 WEB_CLIENT_IS_DEAD(w);
2104         }
2105         else {
2106                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk header to client.", w->id);
2107                 WEB_CLIENT_IS_DEAD(w);
2108         }
2109
2110         return bytes;
2111 }
2112
2113 ssize_t web_client_send_chunk_close(struct web_client *w)
2114 {
2115         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
2116
2117         ssize_t bytes = send(w->ofd, "\r\n", 2, 0);
2118         if(bytes > 0) {
2119                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2120                 w->stats_sent_bytes += bytes;
2121         }
2122
2123         else if(bytes == 0) {
2124                 debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
2125                 WEB_CLIENT_IS_DEAD(w);
2126         }
2127         else {
2128                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk suffix to client.", w->id);
2129                 WEB_CLIENT_IS_DEAD(w);
2130         }
2131
2132         return bytes;
2133 }
2134
2135 ssize_t web_client_send_chunk_finalize(struct web_client *w)
2136 {
2137         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
2138
2139         ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
2140         if(bytes > 0) {
2141                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2142                 w->stats_sent_bytes += bytes;
2143         }
2144
2145         else if(bytes == 0) {
2146                 debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
2147                 WEB_CLIENT_IS_DEAD(w);
2148         }
2149         else {
2150                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
2151                 WEB_CLIENT_IS_DEAD(w);
2152         }
2153
2154         return bytes;
2155 }
2156
2157 #ifdef NETDATA_WITH_ZLIB
2158 ssize_t web_client_send_deflate(struct web_client *w)
2159 {
2160         ssize_t len = 0, t = 0;
2161
2162         // when using compression,
2163         // w->response.sent is the amount of bytes passed through compression
2164
2165         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);
2166
2167         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) {
2168                 // there is nothing to send
2169
2170                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2171
2172                 // finalize the chunk
2173                 if(w->response.sent != 0) {
2174                         t = web_client_send_chunk_finalize(w);
2175                         if(t < 0) return t;
2176                 }
2177
2178                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2179                         // we have to wait, more data will come
2180                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2181                         w->wait_send = 0;
2182                         return t;
2183                 }
2184
2185                 if(unlikely(!w->keepalive)) {
2186                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2187                         WEB_CLIENT_IS_DEAD(w);
2188                         return t;
2189                 }
2190
2191                 // reset the client
2192                 web_client_reset(w);
2193                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
2194                 return t;
2195         }
2196
2197         if(w->response.zhave == w->response.zsent) {
2198                 // compress more input data
2199
2200                 // close the previous open chunk
2201                 if(w->response.sent != 0) {
2202                         t = web_client_send_chunk_close(w);
2203                         if(t < 0) return t;
2204                 }
2205
2206                 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);
2207
2208                 // give the compressor all the data not passed through the compressor yet
2209                 if(w->response.data->len > w->response.sent) {
2210                         w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
2211                         w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
2212                 }
2213
2214                 // reset the compressor output buffer
2215                 w->response.zstream.next_out = w->response.zbuffer;
2216                 w->response.zstream.avail_out = ZLIB_CHUNK;
2217
2218                 // ask for FINISH if we have all the input
2219                 int flush = Z_SYNC_FLUSH;
2220                 if(w->mode == WEB_CLIENT_MODE_NORMAL
2221                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
2222                         flush = Z_FINISH;
2223                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
2224                 }
2225                 else {
2226                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
2227                 }
2228
2229                 // compress
2230                 if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
2231                         error("%llu: Compression failed. Closing down client.", w->id);
2232                         web_client_reset(w);
2233                         return(-1);
2234                 }
2235
2236                 w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
2237                 w->response.zsent = 0;
2238
2239                 // keep track of the bytes passed through the compressor
2240                 w->response.sent = w->response.data->len;
2241
2242                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
2243
2244                 // open a new chunk
2245                 ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
2246                 if(t2 < 0) return t2;
2247                 t += t2;
2248         }
2249
2250         debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
2251
2252         len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
2253         if(len > 0) {
2254                 w->stats_sent_bytes += len;
2255                 w->response.zsent += len;
2256                 len += t;
2257                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
2258         }
2259         else if(len == 0) {
2260                 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);
2261                 WEB_CLIENT_IS_DEAD(w);
2262         }
2263         else {
2264                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2265                 WEB_CLIENT_IS_DEAD(w);
2266         }
2267
2268         return(len);
2269 }
2270 #endif // NETDATA_WITH_ZLIB
2271
2272 ssize_t web_client_send(struct web_client *w) {
2273 #ifdef NETDATA_WITH_ZLIB
2274         if(likely(w->response.zoutput)) return web_client_send_deflate(w);
2275 #endif // NETDATA_WITH_ZLIB
2276
2277         ssize_t bytes;
2278
2279         if(unlikely(w->response.data->len - w->response.sent == 0)) {
2280                 // there is nothing to send
2281
2282                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2283
2284                 // there can be two cases for this
2285                 // A. we have done everything
2286                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
2287
2288                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2289                         // we have to wait, more data will come
2290                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2291                         w->wait_send = 0;
2292                         return 0;
2293                 }
2294
2295                 if(unlikely(!w->keepalive)) {
2296                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2297                         WEB_CLIENT_IS_DEAD(w);
2298                         return 0;
2299                 }
2300
2301                 web_client_reset(w);
2302                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
2303                 return 0;
2304         }
2305
2306         bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
2307         if(likely(bytes > 0)) {
2308                 w->stats_sent_bytes += bytes;
2309                 w->response.sent += bytes;
2310                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
2311         }
2312         else if(likely(bytes == 0)) {
2313                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
2314                 WEB_CLIENT_IS_DEAD(w);
2315         }
2316         else {
2317                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2318                 WEB_CLIENT_IS_DEAD(w);
2319         }
2320
2321         return(bytes);
2322 }
2323
2324 ssize_t web_client_receive(struct web_client *w)
2325 {
2326         // do we have any space for more data?
2327         buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
2328
2329         ssize_t left = w->response.data->size - w->response.data->len;
2330         ssize_t bytes;
2331
2332         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
2333                 bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
2334         else
2335                 bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
2336
2337         if(likely(bytes > 0)) {
2338                 if(w->mode != WEB_CLIENT_MODE_FILECOPY)
2339                         w->stats_received_bytes += bytes;
2340
2341                 size_t old = w->response.data->len;
2342                 w->response.data->len += bytes;
2343                 w->response.data->buffer[w->response.data->len] = '\0';
2344
2345                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
2346                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
2347
2348                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2349                         w->wait_send = 1;
2350
2351                         if(w->response.rlen && w->response.data->len >= w->response.rlen)
2352                                 w->wait_receive = 0;
2353                 }
2354         }
2355         else if(likely(bytes == 0)) {
2356                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
2357
2358                 // if we cannot read, it means we have an error on input.
2359                 // if however, we are copying a file from ifd to ofd, we should not return an error.
2360                 // in this case, the error should be generated when the file has been sent to the client.
2361
2362                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2363                         // we are copying data from ifd to ofd
2364                         // let it finish copying...
2365                         w->wait_receive = 0;
2366
2367                         debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
2368                         if(w->ifd != w->ofd) close(w->ifd);
2369                         w->ifd = w->ofd;
2370                 }
2371                 else {
2372                         debug(D_WEB_CLIENT, "%llu: failed to receive data.", w->id);
2373                         WEB_CLIENT_IS_DEAD(w);
2374                 }
2375         }
2376         else {
2377                 debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
2378                 WEB_CLIENT_IS_DEAD(w);
2379         }
2380
2381         return(bytes);
2382 }
2383
2384
2385 // --------------------------------------------------------------------------------------
2386 // the thread of a single client
2387
2388 // 1. waits for input and output, using async I/O
2389 // 2. it processes HTTP requests
2390 // 3. it generates HTTP responses
2391 // 4. it copies data from input to output if mode is FILECOPY
2392
2393 void *web_client_main(void *ptr)
2394 {
2395         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
2396                 error("Cannot set pthread cancel type to DEFERRED.");
2397
2398         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
2399                 error("Cannot set pthread cancel state to ENABLE.");
2400
2401         struct web_client *w = ptr;
2402         struct pollfd fds[2], *ifd, *ofd;
2403         int retval, fdmax = 0, timeout;
2404
2405         log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2406
2407         for(;;) {
2408                 if(unlikely(w->dead)) {
2409                         debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
2410                         break;
2411                 }
2412                 else if(unlikely(!w->wait_receive && !w->wait_send)) {
2413                         debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.");
2414                         break;
2415                 }
2416
2417                 if(unlikely(w->ifd < 0 || w->ofd < 0)) {
2418                         error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
2419                         break;
2420                 }
2421
2422                 if(w->ifd == w->ofd) {
2423                         fds[0].fd = w->ifd;
2424                         fds[0].events = 0;
2425                         fds[0].revents = 0;
2426
2427                         if(w->wait_receive) fds[0].events |= POLLIN;
2428                         if(w->wait_send)    fds[0].events |= POLLOUT;
2429
2430                         fds[1].fd = -1;
2431                         fds[1].events = 0;
2432                         fds[1].revents = 0;
2433
2434                         ifd = ofd = &fds[0];
2435
2436                         fdmax = 1;
2437                 }
2438                 else {
2439                         fds[0].fd = w->ifd;
2440                         fds[0].events = 0;
2441                         fds[0].revents = 0;
2442                         if(w->wait_receive) fds[0].events |= POLLIN;
2443                         ifd = &fds[0];
2444
2445                         fds[1].fd = w->ofd;
2446                         fds[1].events = 0;
2447                         fds[1].revents = 0;
2448                         if(w->wait_send)    fds[1].events |= POLLOUT;
2449                         ofd = &fds[1];
2450
2451                         fdmax = 2;
2452                 }
2453
2454                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2455                 errno = 0;
2456                 timeout = web_client_timeout * 1000;
2457                 retval = poll(fds, fdmax, timeout);
2458
2459                 if(unlikely(retval == -1)) {
2460                         if(errno == EAGAIN || errno == EINTR) {
2461                                 debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
2462                                 continue;
2463                         }
2464
2465                         debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
2466                         break;
2467                 }
2468                 else if(unlikely(!retval)) {
2469                         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":"");
2470                         break;
2471                 }
2472
2473                 int used = 0;
2474                 if(w->wait_send && ofd->revents & POLLOUT) {
2475                         used++;
2476                         if(web_client_send(w) < 0) {
2477                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
2478                                 break;
2479                         }
2480                 }
2481
2482                 if(w->wait_receive && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
2483                         used++;
2484                         if(web_client_receive(w) < 0) {
2485                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
2486                                 break;
2487                         }
2488
2489                         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
2490                                 debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
2491                                 web_client_process(w);
2492                         }
2493                 }
2494
2495                 if(unlikely(!used)) {
2496                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
2497                         break;
2498                 }
2499         }
2500
2501         web_client_reset(w);
2502
2503         log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2504         debug(D_WEB_CLIENT, "%llu: done...", w->id);
2505
2506         // close the sockets/files now
2507         // to free file descriptors
2508         if(w->ifd == w->ofd) {
2509                 if(w->ifd != -1) close(w->ifd);
2510         }
2511         else {
2512                 if(w->ifd != -1) close(w->ifd);
2513                 if(w->ofd != -1) close(w->ofd);
2514         }
2515         w->ifd = -1;
2516         w->ofd = -1;
2517
2518         w->obsolete = 1;
2519
2520         pthread_exit(NULL);
2521         return NULL;
2522 }