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 <netinet/tcp.h>
  15 #include <malloc.h>
  16 #include <pwd.h>
  17 #include <ctype.h>
  18
  19 #include "common.h"
  20 #include "log.h"
  21 #include "appconfig.h"
  22 #include "url.h"
  23 #include "web_buffer.h"
  24 #include "web_server.h"
  25 #include "global_statistics.h"
  26 #include "rrd.h"
  27 #include "rrd2json.h"
  28
  29 #include "web_client.h"
  30
  31 #define INITIAL_WEB_DATA_LENGTH 16384
  32 #define WEB_REQUEST_LENGTH 16384
  33 #define TOO_BIG_REQUEST 16384
  34
  35 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
  36 int web_enable_gzip = 1;
  37
  38 extern int netdata_exit;
  39
  40 struct web_client *web_clients = NULL;
  41 unsigned long long web_clients_count = 0;
  42
  43 struct web_client *web_client_create(int listener)
  44 {
  45         struct web_client *w;
  46
  47         w = calloc(1, sizeof(struct web_client));
  48         if(!w) {
  49                 error("Cannot allocate new web_client memory.");
  50                 return NULL;
  51         }
  52
  53         w->id = ++web_clients_count;
  54         w->mode = WEB_CLIENT_MODE_NORMAL;
  55
  56         {
  57                 struct sockaddr *sadr;
  58                 socklen_t addrlen;
  59
  60                 sadr = (struct sockaddr*) &w->clientaddr;
  61                 addrlen = sizeof(w->clientaddr);
  62
  63                 w->ifd = accept(listener, sadr, &addrlen);
  64                 if (w->ifd == -1) {
  65                         error("%llu: Cannot accept new incoming connection.", w->id);
  66                         free(w);
  67                         return NULL;
  68                 }
  69                 w->ofd = w->ifd;
  70
  71                 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
  72                         error("Cannot getnameinfo() on received client connection.");
  73                         strncpy(w->client_ip,   "UNKNOWN", NI_MAXHOST);
  74                         strncpy(w->client_port, "UNKNOWN", NI_MAXSERV);
  75                 }
  76                 w->client_ip[NI_MAXHOST]   = '\0';
  77                 w->client_port[NI_MAXSERV] = '\0';
  78
  79                 switch(sadr->sa_family) {
  80
  81                 case AF_INET:
  82                         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);
  83                         break;
  84
  85                 case AF_INET6:
  86                         if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
  87                                 strcpy(w->client_ip, &w->client_ip[7]);
  88                                 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);
  89                         }
  90                         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);
  91                         break;
  92
  93                 default:
  94                         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);
  95                         break;
  96                 }
  97
  98                 int flag = 1;
  99                 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0) error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
 100         }
 101
 102         w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
 103         if(unlikely(!w->response.data)) {
 104                 // no need for error log - web_buffer_create already logged the error
 105                 close(w->ifd);
 106                 free(w);
 107                 return NULL;
 108         }
 109
 110         w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 111         if(unlikely(!w->response.header)) {
 112                 // no need for error log - web_buffer_create already logged the error
 113                 buffer_free(w->response.data);
 114                 close(w->ifd);
 115                 free(w);
 116                 return NULL;
 117         }
 118
 119         w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 120         if(unlikely(!w->response.header_output)) {
 121                 // no need for error log - web_buffer_create already logged the error
 122                 buffer_free(w->response.header);
 123                 buffer_free(w->response.data);
 124                 close(w->ifd);
 125                 free(w);
 126                 return NULL;
 127         }
 128
 129         w->wait_receive = 1;
 130
 131         if(web_clients) web_clients->prev = w;
 132         w->next = web_clients;
 133         web_clients = w;
 134
 135         global_statistics.connected_clients++;
 136
 137         return(w);
 138 }
 139
 140 void web_client_reset(struct web_client *w)
 141 {
 142         struct timeval tv;
 143         gettimeofday(&tv, NULL);
 144
 145         long sent = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 146
 147 #ifdef NETDATA_WITH_ZLIB
 148         if(likely(w->response.zoutput)) sent = (long)w->response.zstream.total_out;
 149 #endif
 150
 151         long size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 152
 153         if(likely(w->last_url[0]))
 154                 log_access("%llu: (sent/all = %ld/%ld bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
 155                         w->id,
 156                         sent, size, -((size>0)?((float)(size-sent)/(float)size * 100.0):0.0),
 157                         (float)usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
 158                         (float)usecdiff(&tv, &w->tv_ready) / 1000.0,
 159                         (float)usecdiff(&tv, &w->tv_in) / 1000.0,
 160                         (w->mode == WEB_CLIENT_MODE_FILECOPY)?"filecopy":((w->mode == WEB_CLIENT_MODE_OPTIONS)?"options":"data"),
 161                         w->response.code,
 162                         w->last_url
 163                 );
 164
 165         debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 166
 167         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
 168                 debug(D_WEB_CLIENT, "%llu: Closing filecopy input file.", w->id);
 169                 close(w->ifd);
 170                 w->ifd = w->ofd;
 171         }
 172
 173         w->last_url[0] = '\0';
 174
 175         w->mode = WEB_CLIENT_MODE_NORMAL;
 176
 177         buffer_reset(w->response.header_output);
 178         buffer_reset(w->response.header);
 179         buffer_reset(w->response.data);
 180         w->response.rlen = 0;
 181         w->response.sent = 0;
 182         w->response.code = 0;
 183
 184         w->wait_receive = 1;
 185         w->wait_send = 0;
 186
 187         w->response.zoutput = 0;
 188
 189         // if we had enabled compression, release it
 190 #ifdef NETDATA_WITH_ZLIB
 191         if(w->response.zinitialized) {
 192                 debug(D_DEFLATE, "%llu: Reseting compression.", w->id);
 193                 deflateEnd(&w->response.zstream);
 194                 w->response.zsent = 0;
 195                 w->response.zhave = 0;
 196                 w->response.zstream.avail_in = 0;
 197                 w->response.zstream.avail_out = 0;
 198                 w->response.zstream.total_in = 0;
 199                 w->response.zstream.total_out = 0;
 200                 w->response.zinitialized = 0;
 201         }
 202 #endif // NETDATA_WITH_ZLIB
 203 }
 204
 205 struct web_client *web_client_free(struct web_client *w)
 206 {
 207         struct web_client *n = w->next;
 208
 209         debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 210
 211         if(w->prev)     w->prev->next = w->next;
 212         if(w->next) w->next->prev = w->prev;
 213
 214         if(w == web_clients) web_clients = w->next;
 215
 216         if(w->response.header_output) buffer_free(w->response.header_output);
 217         if(w->response.header) buffer_free(w->response.header);
 218         if(w->response.data) buffer_free(w->response.data);
 219         close(w->ifd);
 220         if(w->ofd != w->ifd) close(w->ofd);
 221         free(w);
 222
 223         global_statistics.connected_clients--;
 224
 225         return(n);
 226 }
 227
 228 uid_t web_files_uid(void)
 229 {
 230         static char *web_owner = NULL;
 231         static uid_t owner_uid = 0;
 232
 233         if(unlikely(!web_owner)) {
 234                 web_owner = config_get("global", "web files owner", NETDATA_USER);
 235                 if(!web_owner || !*web_owner)
 236                         owner_uid = geteuid();
 237                 else {
 238                         struct passwd *pw = getpwnam(web_owner);
 239                         if(!pw) {
 240                                 error("User %s is not present. Ignoring option.", web_owner);
 241                                 owner_uid = geteuid();
 242                         }
 243                         else {
 244                                 debug(D_WEB_CLIENT, "Web files owner set to %s.\n", web_owner);
 245                                 owner_uid = pw->pw_uid;
 246                         }
 247                 }
 248         }
 249
 250         return(owner_uid);
 251 }
 252
 253 int mysendfile(struct web_client *w, char *filename)
 254 {
 255         static char *web_dir = NULL;
 256
 257         // initialize our static data
 258         if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
 259
 260         debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
 261
 262         // skip leading slashes
 263         while (*filename == '/') filename++;
 264
 265         // if the filename contain known paths, skip them
 266         if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE) + 1];
 267
 268         char *s;
 269         for(s = filename; *s ;s++) {
 270                 if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
 271                         debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 272                         buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
 273                         return 400;
 274                 }
 275         }
 276
 277         // if the filename contains a .. refuse to serve it
 278         if(strstr(filename, "..") != 0) {
 279                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 280                 buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
 281                 return 400;
 282         }
 283
 284         // access the file
 285         char webfilename[FILENAME_MAX + 1];
 286         snprintf(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
 287
 288         // check if the file exists
 289         struct stat stat;
 290         if(lstat(webfilename, &stat) != 0) {
 291                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
 292                 buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
 293                 return 404;
 294         }
 295
 296         // check if the file is owned by expected user
 297         if(stat.st_uid != web_files_uid()) {
 298                 error("%llu: File '%s' is owned by user %d (expected user %d). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
 299                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 300                 return 403;
 301         }
 302
 303         if((stat.st_mode & S_IFMT) == S_IFDIR) {
 304                 snprintf(webfilename, FILENAME_MAX+1, "%s/index.html", filename);
 305                 return mysendfile(w, webfilename);
 306         }
 307
 308         if((stat.st_mode & S_IFMT) != S_IFREG) {
 309                 error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
 310                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 311                 return 403;
 312         }
 313
 314         // open the file
 315         w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
 316         if(w->ifd == -1) {
 317                 w->ifd = w->ofd;
 318
 319                 if(errno == EBUSY || errno == EAGAIN) {
 320                         error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
 321                         buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
 322                         buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
 323                         return 307;
 324                 }
 325                 else {
 326                         error("%llu: Cannot open file '%s'.", w->id, webfilename);
 327                         buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
 328                         return 404;
 329                 }
 330         }
 331
 332         // pick a Content-Type for the file
 333                  if(strstr(filename, ".html") != NULL)  w->response.data->contenttype = CT_TEXT_HTML;
 334         else if(strstr(filename, ".js")   != NULL)      w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 335         else if(strstr(filename, ".css")  != NULL)      w->response.data->contenttype = CT_TEXT_CSS;
 336         else if(strstr(filename, ".xml")  != NULL)      w->response.data->contenttype = CT_TEXT_XML;
 337         else if(strstr(filename, ".xsl")  != NULL)      w->response.data->contenttype = CT_TEXT_XSL;
 338         else if(strstr(filename, ".txt")  != NULL)  w->response.data->contenttype = CT_TEXT_PLAIN;
 339         else if(strstr(filename, ".svg")  != NULL)  w->response.data->contenttype = CT_IMAGE_SVG_XML;
 340         else if(strstr(filename, ".ttf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
 341         else if(strstr(filename, ".otf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
 342         else if(strstr(filename, ".woff2")!= NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF2;
 343         else if(strstr(filename, ".woff") != NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF;
 344         else if(strstr(filename, ".eot")  != NULL)  w->response.data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
 345         else if(strstr(filename, ".png")  != NULL)  w->response.data->contenttype = CT_IMAGE_PNG;
 346         else if(strstr(filename, ".jpg")  != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 347         else if(strstr(filename, ".jpeg") != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 348         else if(strstr(filename, ".gif")  != NULL)  w->response.data->contenttype = CT_IMAGE_GIF;
 349         else if(strstr(filename, ".bmp")  != NULL)  w->response.data->contenttype = CT_IMAGE_BMP;
 350         else if(strstr(filename, ".ico")  != NULL)  w->response.data->contenttype = CT_IMAGE_XICON;
 351         else if(strstr(filename, ".icns") != NULL)  w->response.data->contenttype = CT_IMAGE_ICNS;
 352         else w->response.data->contenttype = CT_APPLICATION_OCTET_STREAM;
 353
 354         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);
 355
 356         w->mode = WEB_CLIENT_MODE_FILECOPY;
 357         w->wait_receive = 1;
 358         w->wait_send = 0;
 359         buffer_flush(w->response.data);
 360         w->response.rlen = stat.st_size;
 361         w->response.data->date = stat.st_mtim.tv_sec;
 362
 363         return 200;
 364 }
 365
 366
 367 #ifdef NETDATA_WITH_ZLIB
 368 void web_client_enable_deflate(struct web_client *w) {
 369         if(w->response.zinitialized == 1) {
 370                 error("%llu: Compression has already be initialized for this client.", w->id);
 371                 return;
 372         }
 373
 374         if(w->response.sent) {
 375                 error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
 376                 return;
 377         }
 378
 379         w->response.zstream.zalloc = Z_NULL;
 380         w->response.zstream.zfree = Z_NULL;
 381         w->response.zstream.opaque = Z_NULL;
 382
 383         w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
 384         w->response.zstream.avail_in = 0;
 385         w->response.zstream.total_in = 0;
 386
 387         w->response.zstream.next_out = w->response.zbuffer;
 388         w->response.zstream.avail_out = 0;
 389         w->response.zstream.total_out = 0;
 390
 391         w->response.zstream.zalloc = Z_NULL;
 392         w->response.zstream.zfree = Z_NULL;
 393         w->response.zstream.opaque = Z_NULL;
 394
 395 //      if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 396 //              error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 397 //              return;
 398 //      }
 399
 400         // Select GZIP compression: windowbits = 15 + 16 = 31
 401         if(deflateInit2(&w->response.zstream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
 402                 error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 403                 return;
 404         }
 405
 406         w->response.zsent = 0;
 407         w->response.zoutput = 1;
 408         w->response.zinitialized = 1;
 409
 410         debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
 411 }
 412 #endif // NETDATA_WITH_ZLIB
 413
 414 uint32_t web_client_api_request_v1_data_options(char *o)
 415 {
 416         uint32_t ret = 0x00000000;
 417         char *tok;
 418
 419         while(o && *o && (tok = mystrsep(&o, ", |"))) {
 420                 if(!*tok) continue;
 421
 422                 if(!strcmp(tok, "nonzero"))
 423                         ret |= RRDR_OPTION_NONZERO;
 424                 else if(!strcmp(tok, "flip") || !strcmp(tok, "reversed") || !strcmp(tok, "reverse"))
 425                         ret |= RRDR_OPTION_REVERSED;
 426                 else if(!strcmp(tok, "jsonwrap"))
 427                         ret |= RRDR_OPTION_JSON_WRAP;
 428                 else if(!strcmp(tok, "min2max"))
 429                         ret |= RRDR_OPTION_MIN2MAX;
 430                 else if(!strcmp(tok, "ms") || !strcmp(tok, "milliseconds"))
 431                         ret |= RRDR_OPTION_MILLISECONDS;
 432                 else if(!strcmp(tok, "abs") || !strcmp(tok, "absolute") || !strcmp(tok, "absolute_sum") || !strcmp(tok, "absolute-sum"))
 433                         ret |= RRDR_OPTION_ABSOLUTE;
 434                 else if(!strcmp(tok, "seconds"))
 435                         ret |= RRDR_OPTION_SECONDS;
 436                 else if(!strcmp(tok, "null2zero"))
 437                         ret |= RRDR_OPTION_NULL2ZERO;
 438                 else if(!strcmp(tok, "objectrows"))
 439                         ret |= RRDR_OPTION_OBJECTSROWS;
 440                 else if(!strcmp(tok, "google_json"))
 441                         ret |= RRDR_OPTION_GOOGLE_JSON;
 442                 else if(!strcmp(tok, "percentage"))
 443                         ret |= RRDR_OPTION_PERCENTAGE;
 444         }
 445
 446         return ret;
 447 }
 448
 449 uint32_t web_client_api_request_v1_data_format(char *name)
 450 {
 451         if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
 452                 return DATASOURCE_DATATABLE_JSON;
 453
 454         else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
 455                 return DATASOURCE_DATATABLE_JSONP;
 456
 457         else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
 458                 return DATASOURCE_JSON;
 459
 460         else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
 461                 return DATASOURCE_JSONP;
 462
 463         else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
 464                 return DATASOURCE_SSV;
 465
 466         else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
 467                 return DATASOURCE_CSV;
 468
 469         else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
 470                 return DATASOURCE_TSV;
 471
 472         else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
 473                 return DATASOURCE_HTML;
 474
 475         else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
 476                 return DATASOURCE_JS_ARRAY;
 477
 478         else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
 479                 return DATASOURCE_SSV_COMMA;
 480
 481         else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
 482                 return DATASOURCE_CSV_JSON_ARRAY;
 483
 484         return DATASOURCE_JSON;
 485 }
 486
 487 uint32_t web_client_api_request_v1_data_google_format(char *name)
 488 {
 489         if(!strcmp(name, "json"))
 490                 return DATASOURCE_DATATABLE_JSONP;
 491
 492         else if(!strcmp(name, "html"))
 493                 return DATASOURCE_HTML;
 494
 495         else if(!strcmp(name, "csv"))
 496                 return DATASOURCE_CSV;
 497
 498         else if(!strcmp(name, "tsv-excel"))
 499                 return DATASOURCE_TSV;
 500
 501         return DATASOURCE_JSON;
 502 }
 503
 504 int web_client_api_request_v1_data_group(char *name)
 505 {
 506         if(!strcmp(name, "max"))
 507                 return GROUP_MAX;
 508
 509         else if(!strcmp(name, "average"))
 510                 return GROUP_AVERAGE;
 511
 512         return GROUP_MAX;
 513 }
 514
 515 int web_client_api_request_v1_charts(struct web_client *w, char *url)
 516 {
 517         if(url) { ; }
 518
 519         buffer_flush(w->response.data);
 520         w->response.data->contenttype = CT_APPLICATION_JSON;
 521         rrd_stats_api_v1_charts(w->response.data);
 522         return 200;
 523 }
 524
 525 int web_client_api_request_v1_chart(struct web_client *w, char *url)
 526 {
 527         int ret = 400;
 528         char *chart = NULL;
 529
 530         buffer_flush(w->response.data);
 531
 532         while(url) {
 533                 char *value = mystrsep(&url, "?&[]");
 534                 if(!value || !*value) continue;
 535
 536                 char *name = mystrsep(&value, "=");
 537                 if(!name || !*name) continue;
 538                 if(!value || !*value) continue;
 539
 540                 // name and value are now the parameters
 541                 // they are not null and not empty
 542
 543                 if(!strcmp(name, "chart")) chart = value;
 544                 //else {
 545                 ///     buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
 546                 //      goto cleanup;
 547                 //}
 548         }
 549
 550         if(!chart || !*chart) {
 551                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 552                 goto cleanup;
 553         }
 554
 555         RRDSET *st = rrdset_find(chart);
 556         if(!st) st = rrdset_find_byname(chart);
 557         if(!st) {
 558                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 559                 ret = 404;
 560                 goto cleanup;
 561         }
 562
 563         w->response.data->contenttype = CT_APPLICATION_JSON;
 564         rrd_stats_api_v1_chart(st, w->response.data);
 565         return 200;
 566
 567 cleanup:
 568         return ret;
 569 }
 570
 571 // returns the HTTP code
 572 int web_client_api_request_v1_data(struct web_client *w, char *url)
 573 {
 574         debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
 575
 576         int ret = 400;
 577         BUFFER *dimensions = NULL;
 578
 579         buffer_flush(w->response.data);
 580
 581         char    *google_version = "0.6",
 582                         *google_reqId = "0",
 583                         *google_sig = "0",
 584                         *google_out = "json",
 585                         *responseHandler = NULL,
 586                         *outFileName = NULL;
 587
 588         time_t last_timestamp_in_data = 0, google_timestamp = 0;
 589
 590         char *chart = NULL
 591                         , *before_str = NULL
 592                         , *after_str = NULL
 593                         , *points_str = NULL;
 594
 595         int group = GROUP_MAX;
 596         uint32_t format = DATASOURCE_JSON;
 597         uint32_t options = 0x00000000;
 598
 599         while(url) {
 600                 char *value = mystrsep(&url, "?&[]");
 601                 if(!value || !*value) continue;
 602
 603                 char *name = mystrsep(&value, "=");
 604                 if(!name || !*name) continue;
 605                 if(!value || !*value) continue;
 606
 607                 debug(D_WEB_CLIENT, "%llu: API v1 query param '%s' with value '%s'", w->id, name, value);
 608
 609                 // name and value are now the parameters
 610                 // they are not null and not empty
 611
 612                 if(!strcmp(name, "chart")) chart = value;
 613                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 614                         if(!dimensions) dimensions = buffer_create(strlen(value));
 615                         if(dimensions) {
 616                                 buffer_strcat(dimensions, "|");
 617                                 buffer_strcat(dimensions, value);
 618                         }
 619                 }
 620                 else if(!strcmp(name, "after")) after_str = value;
 621                 else if(!strcmp(name, "before")) before_str = value;
 622                 else if(!strcmp(name, "points")) points_str = value;
 623                 else if(!strcmp(name, "group")) {
 624                         group = web_client_api_request_v1_data_group(value);
 625                 }
 626                 else if(!strcmp(name, "format")) {
 627                         format = web_client_api_request_v1_data_format(value);
 628                 }
 629                 else if(!strcmp(name, "options")) {
 630                         options |= web_client_api_request_v1_data_options(value);
 631                 }
 632                 else if(!strcmp(name, "callback")) {
 633                         responseHandler = value;
 634                 }
 635                 else if(!strcmp(name, "filename")) {
 636                         outFileName = value;
 637                 }
 638                 else if(!strcmp(name, "tqx")) {
 639                         // parse Google Visualization API options
 640                         // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
 641                         char *tqx_name, *tqx_value;
 642
 643                         while(value) {
 644                                 tqx_value = mystrsep(&value, ";");
 645                                 if(!tqx_value || !*tqx_value) continue;
 646
 647                                 tqx_name = mystrsep(&tqx_value, ":");
 648                                 if(!tqx_name || !*tqx_name) continue;
 649                                 if(!tqx_value || !*tqx_value) continue;
 650
 651                                 if(!strcmp(tqx_name, "version"))
 652                                         google_version = tqx_value;
 653                                 else if(!strcmp(tqx_name, "reqId"))
 654                                         google_reqId = tqx_value;
 655                                 else if(!strcmp(tqx_name, "sig")) {
 656                                         google_sig = tqx_value;
 657                                         google_timestamp = strtoul(google_sig, NULL, 0);
 658                                 }
 659                                 else if(!strcmp(tqx_name, "out")) {
 660                                         google_out = tqx_value;
 661                                         format = web_client_api_request_v1_data_google_format(google_out);
 662                                 }
 663                                 else if(!strcmp(tqx_name, "responseHandler"))
 664                                         responseHandler = tqx_value;
 665                                 else if(!strcmp(tqx_name, "outFileName"))
 666                                         outFileName = tqx_value;
 667                         }
 668                 }
 669         }
 670
 671         if(!chart || !*chart) {
 672                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 673                 goto cleanup;
 674         }
 675
 676         RRDSET *st = rrdset_find(chart);
 677         if(!st) st = rrdset_find_byname(chart);
 678         if(!st) {
 679                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 680                 ret = 404;
 681                 goto cleanup;
 682         }
 683
 684         long long before = (before_str && *before_str)?atol(before_str):0;
 685         long long after  = (after_str  && *after_str) ?atol(after_str):0;
 686         int       points = (points_str && *points_str)?atoi(points_str):0;
 687
 688         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'"
 689                         , w->id
 690                         , chart
 691                         , (dimensions)?buffer_tostring(dimensions):""
 692                         , after
 693                         , before
 694                         , points
 695                         , group
 696                         , format
 697                         , options
 698                         );
 699
 700         if(outFileName && *outFileName) {
 701                 buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
 702                 error("generating outfilename header: '%s'", outFileName);
 703         }
 704
 705         if(format == DATASOURCE_DATATABLE_JSONP) {
 706                 if(responseHandler == NULL)
 707                         responseHandler = "google.visualization.Query.setResponse";
 708
 709                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 710                                 w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
 711                         );
 712
 713                 buffer_sprintf(w->response.data,
 714                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 715                         responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
 716         }
 717         else if(format == DATASOURCE_JSONP) {
 718                 if(responseHandler == NULL)
 719                         responseHandler = "callback";
 720
 721                 buffer_strcat(w->response.data, responseHandler);
 722                 buffer_strcat(w->response.data, "(");
 723         }
 724
 725         ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
 726
 727         if(format == DATASOURCE_DATATABLE_JSONP) {
 728                 if(google_timestamp < last_timestamp_in_data)
 729                         buffer_strcat(w->response.data, "});");
 730
 731                 else {
 732                         // the client already has the latest data
 733                         buffer_flush(w->response.data);
 734                         buffer_sprintf(w->response.data,
 735                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
 736                                 responseHandler, google_version, google_reqId);
 737                 }
 738         }
 739         else if(format == DATASOURCE_JSONP)
 740                 buffer_strcat(w->response.data, ");");
 741
 742 cleanup:
 743         if(dimensions) buffer_free(dimensions);
 744         return ret;
 745 }
 746
 747 int web_client_api_request_v1(struct web_client *w, char *url)
 748 {
 749         // get the command
 750         char *tok = mystrsep(&url, "/?&");
 751         debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
 752
 753         if(strcmp(tok, "data") == 0)
 754                 return web_client_api_request_v1_data(w, url);
 755         else if(strcmp(tok, "chart") == 0)
 756                 return web_client_api_request_v1_chart(w, url);
 757         else if(strcmp(tok, "charts") == 0)
 758                 return web_client_api_request_v1_charts(w, url);
 759
 760         buffer_flush(w->response.data);
 761         buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
 762         return 404;
 763 }
 764
 765 int web_client_api_request(struct web_client *w, char *url)
 766 {
 767         // get the api version
 768         char *tok = mystrsep(&url, "/?&");
 769         debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
 770
 771         if(strcmp(tok, "v1") == 0)
 772                 return web_client_api_request_v1(w, url);
 773
 774         buffer_flush(w->response.data);
 775         buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
 776         return 404;
 777 }
 778
 779 int web_client_data_request(struct web_client *w, char *url, int datasource_type)
 780 {
 781         char *args = strchr(url, '?');
 782         if(args) {
 783                 *args='\0';
 784                 args = &args[1];
 785         }
 786
 787         // get the name of the data to show
 788         char *tok = mystrsep(&url, "/");
 789         debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
 790
 791         // do we have such a data set?
 792         RRDSET *st = rrdset_find_byname(tok);
 793         if(!st) st = rrdset_find(tok);
 794         if(!st) {
 795                 // we don't have it
 796                 // try to send a file with that name
 797                 buffer_flush(w->response.data);
 798                 return(mysendfile(w, tok));
 799         }
 800
 801         // we have it
 802         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
 803
 804         // how many entries does the client want?
 805         long lines = rrd_default_history_entries;
 806         long group_count = 1;
 807         time_t after = 0, before = 0;
 808         int group_method = GROUP_AVERAGE;
 809         int nonzero = 0;
 810
 811         if(url) {
 812                 // parse the lines required
 813                 tok = mystrsep(&url, "/");
 814                 if(tok) lines = atoi(tok);
 815                 if(lines < 1) lines = 1;
 816         }
 817         if(url) {
 818                 // parse the group count required
 819                 tok = mystrsep(&url, "/");
 820                 if(tok) group_count = atoi(tok);
 821                 if(group_count < 1) group_count = 1;
 822                 //if(group_count > save_history / 20) group_count = save_history / 20;
 823         }
 824         if(url) {
 825                 // parse the grouping method required
 826                 tok = mystrsep(&url, "/");
 827                 if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
 828                 else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
 829                 else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
 830                 else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
 831         }
 832         if(url) {
 833                 // parse after time
 834                 tok = mystrsep(&url, "/");
 835                 if(tok) after = strtoul(tok, NULL, 10);
 836                 if(after < 0) after = 0;
 837         }
 838         if(url) {
 839                 // parse before time
 840                 tok = mystrsep(&url, "/");
 841                 if(tok) before = strtoul(tok, NULL, 10);
 842                 if(before < 0) before = 0;
 843         }
 844         if(url) {
 845                 // parse nonzero
 846                 tok = mystrsep(&url, "/");
 847                 if(tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
 848         }
 849
 850         w->response.data->contenttype = CT_APPLICATION_JSON;
 851         buffer_flush(w->response.data);
 852
 853         char *google_version = "0.6";
 854         char *google_reqId = "0";
 855         char *google_sig = "0";
 856         char *google_out = "json";
 857         char *google_responseHandler = "google.visualization.Query.setResponse";
 858         char *google_outFileName = NULL;
 859         time_t last_timestamp_in_data = 0;
 860         if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
 861
 862                 w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 863
 864                 while(args) {
 865                         tok = mystrsep(&args, "&");
 866                         if(tok) {
 867                                 char *name = mystrsep(&tok, "=");
 868                                 if(name && strcmp(name, "tqx") == 0) {
 869                                         char *key = mystrsep(&tok, ":");
 870                                         char *value = mystrsep(&tok, ";");
 871                                         if(key && value && *key && *value) {
 872                                                 if(strcmp(key, "version") == 0)
 873                                                         google_version = value;
 874
 875                                                 else if(strcmp(key, "reqId") == 0)
 876                                                         google_reqId = value;
 877
 878                                                 else if(strcmp(key, "sig") == 0)
 879                                                         google_sig = value;
 880
 881                                                 else if(strcmp(key, "out") == 0)
 882                                                         google_out = value;
 883
 884                                                 else if(strcmp(key, "responseHandler") == 0)
 885                                                         google_responseHandler = value;
 886
 887                                                 else if(strcmp(key, "outFileName") == 0)
 888                                                         google_outFileName = value;
 889                                         }
 890                                 }
 891                         }
 892                 }
 893
 894                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 895                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
 896                         );
 897
 898                 if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
 899                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
 900
 901                         // check the client wants json
 902                         if(strcmp(google_out, "json") != 0) {
 903                                 buffer_sprintf(w->response.data,
 904                                         "%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.'}]});",
 905                                         google_responseHandler, google_version, google_reqId, google_out);
 906                                         return 200;
 907                         }
 908                 }
 909         }
 910
 911         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
 912                 buffer_sprintf(w->response.data,
 913                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 914                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
 915         }
 916
 917         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);
 918         time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, after, before, nonzero);
 919
 920         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
 921                 if(timestamp_in_data > last_timestamp_in_data)
 922                         buffer_strcat(w->response.data, "});");
 923
 924                 else {
 925                         // the client already has the latest data
 926                         buffer_flush(w->response.data);
 927                         buffer_sprintf(w->response.data,
 928                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
 929                                 google_responseHandler, google_version, google_reqId);
 930                 }
 931         }
 932
 933         return 200;
 934 }
 935
 936 /*
 937 int web_client_parse_request(struct web_client *w) {
 938         // protocol
 939         // hostname
 940         // path
 941         // query string name-value
 942         // http version
 943         // method
 944         // http request headers name-value
 945
 946         web_client_clean_request(w);
 947
 948         debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->response.data->bytes, w->response.data->buffer);
 949
 950         char *buf = w->response.data->buffer;
 951         char *line, *tok;
 952
 953         // ------------------------------------------------------------------------
 954         // the first line
 955
 956         if(buf && (line = strsep(&buf, "\r\n"))) {
 957                 // method
 958                 if(line && (tok = strsep(&line, " "))) {
 959                         w->request.protocol = strdup(tok);
 960                 }
 961                 else goto cleanup;
 962
 963                 // url
 964         }
 965         else goto cleanup;
 966
 967         // ------------------------------------------------------------------------
 968         // the rest of the lines
 969
 970         while(buf && (line = strsep(&buf, "\r\n"))) {
 971                 while(line && (tok = strsep(&line, ": "))) {
 972                 }
 973         }
 974
 975         char *url = NULL;
 976
 977
 978 cleanup:
 979         web_client_clean_request(w);
 980         return 0;
 981 }
 982 */
 983
 984 void web_client_process(struct web_client *w) {
 985         int code = 500;
 986         ssize_t bytes;
 987         int enable_gzip = 0;
 988
 989         w->wait_receive = 0;
 990
 991         // check if we have an empty line (end of HTTP header)
 992         if(strstr(w->response.data->buffer, "\r\n\r\n")) {
 993                 global_statistics_lock();
 994                 global_statistics.web_requests++;
 995                 global_statistics_unlock();
 996
 997                 gettimeofday(&w->tv_in, NULL);
 998                 debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->response.data->len, w->response.data->buffer);
 999
1000                 // check if the client requested keep-alive HTTP
1001                 if(strcasestr(w->response.data->buffer, "Connection: keep-alive")) w->keepalive = 1;
1002                 else w->keepalive = 0;
1003
1004 #ifdef NETDATA_WITH_ZLIB
1005                 // check if the client accepts deflate
1006                 if(web_enable_gzip && strstr(w->response.data->buffer, "gzip"))
1007                         enable_gzip = 1;
1008 #endif // NETDATA_WITH_ZLIB
1009
1010                 int datasource_type = DATASOURCE_DATATABLE_JSONP;
1011                 //if(strstr(w->response.data->buffer, "X-DataSource-Auth"))
1012                 //      datasource_type = DATASOURCE_GOOGLE_JSON;
1013
1014                 char *buf = (char *)buffer_tostring(w->response.data);
1015                 char *tok = strsep(&buf, " \r\n");
1016                 char *url = NULL;
1017                 char *pointer_to_free = NULL; // keep url_decode() allocated buffer
1018
1019                 w->mode = WEB_CLIENT_MODE_NORMAL;
1020
1021                 if(buf && strcmp(tok, "GET") == 0) {
1022                         tok = strsep(&buf, " \r\n");
1023                         pointer_to_free = url = url_decode(tok);
1024                         debug(D_WEB_CLIENT, "%llu: Processing HTTP GET on url '%s'.", w->id, url);
1025                 }
1026                 else if(buf && strcmp(tok, "OPTIONS") == 0) {
1027                         tok = strsep(&buf, " \r\n");
1028                         pointer_to_free = url = url_decode(tok);
1029                         debug(D_WEB_CLIENT, "%llu: Processing HTTP OPTIONS on url '%s'.", w->id, url);
1030                         w->mode = WEB_CLIENT_MODE_OPTIONS;
1031                 }
1032                 else if (buf && strcmp(tok, "POST") == 0) {
1033                         w->keepalive = 0;
1034                         tok = strsep(&buf, " \r\n");
1035                         pointer_to_free = url = url_decode(tok);
1036                         debug(D_WEB_CLIENT, "%llu: I don't know how to handle POST with form data. Assuming it is a GET on url '%s'.", w->id, url);
1037                 }
1038
1039                 w->last_url[0] = '\0';
1040
1041                 if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1042                         strncpy(w->last_url, url, URL_MAX);
1043                         w->last_url[URL_MAX] = '\0';
1044
1045                         code = 200;
1046                         w->response.data->contenttype = CT_TEXT_PLAIN;
1047                         buffer_flush(w->response.data);
1048                         buffer_strcat(w->response.data, "OK");
1049                 }
1050                 else if(url) {
1051 #ifdef NETDATA_WITH_ZLIB
1052                         if(enable_gzip)
1053                                 web_client_enable_deflate(w);
1054 #endif
1055
1056                         strncpy(w->last_url, url, URL_MAX);
1057                         w->last_url[URL_MAX] = '\0';
1058
1059                         tok = mystrsep(&url, "/?");
1060
1061                         debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
1062
1063                         if(strcmp(tok, "api") == 0) {
1064                                 // the client is requesting api access
1065                                 datasource_type = DATASOURCE_JSON;
1066                                 code = web_client_api_request(w, url);
1067                         }
1068 #ifdef NETDATA_INTERNAL_CHECKS
1069                         else if(strcmp(tok, "exit") == 0) {
1070                                 netdata_exit = 1;
1071                                 code = 200;
1072                                 w->response.data->contenttype = CT_TEXT_PLAIN;
1073                                 buffer_flush(w->response.data);
1074                                 buffer_strcat(w->response.data, "will do");
1075                         }
1076 #endif
1077                         else if(strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
1078                                 // the client is requesting rrd data
1079                                 datasource_type = DATASOURCE_JSON;
1080                                 code = web_client_data_request(w, url, datasource_type);
1081                         }
1082                         else if(strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
1083                                 // the client is requesting google datasource
1084                                 code = web_client_data_request(w, url, datasource_type);
1085                         }
1086                         else if(strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
1087                                 // the client is requesting an rrd graph
1088
1089                                 // get the name of the data to show
1090                                 tok = mystrsep(&url, "/?&");
1091                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1092
1093                                 // do we have such a data set?
1094                                 RRDSET *st = rrdset_find_byname(tok);
1095                                 if(!st) st = rrdset_find(tok);
1096                                 if(!st) {
1097                                         // we don't have it
1098                                         // try to send a file with that name
1099                                         buffer_flush(w->response.data);
1100                                         code = mysendfile(w, tok);
1101                                 }
1102                                 else {
1103                                         code = 200;
1104                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
1105                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1106                                         buffer_flush(w->response.data);
1107                                         rrd_stats_graph_json(st, url, w->response.data);
1108                                 }
1109                         }
1110 #ifdef NETDATA_INTERNAL_CHECKS
1111                         else if(strcmp(tok, "debug") == 0) {
1112                                 buffer_flush(w->response.data);
1113
1114                                 // get the name of the data to show
1115                                 tok = mystrsep(&url, "/?&");
1116                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1117
1118                                 // do we have such a data set?
1119                                 RRDSET *st = rrdset_find_byname(tok);
1120                                 if(!st) st = rrdset_find(tok);
1121                                 if(!st) {
1122                                         code = 404;
1123                                         buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
1124                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
1125                                 }
1126                                 else {
1127                                         code = 200;
1128                                         debug_flags |= D_RRD_STATS;
1129                                         st->debug = st->debug?0:1;
1130                                         buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
1131                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
1132                                 }
1133                         }
1134                         else if(strcmp(tok, "mirror") == 0) {
1135                                 code = 200;
1136
1137                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
1138
1139                                 // replace the zero bytes with spaces
1140                                 buffer_char_replace(w->response.data, '\0', ' ');
1141
1142                                 // just leave the buffer as is
1143                                 // it will be copied back to the client
1144                         }
1145 #endif
1146                         else if(strcmp(tok, "list") == 0) {
1147                                 code = 200;
1148
1149                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
1150
1151                                 buffer_flush(w->response.data);
1152                                 RRDSET *st = rrdset_root;
1153
1154                                 for ( ; st ; st = st->next )
1155                                         buffer_sprintf(w->response.data, "%s\n", st->name);
1156                         }
1157                         else if(strcmp(tok, "all.json") == 0) {
1158                                 code = 200;
1159                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
1160
1161                                 w->response.data->contenttype = CT_APPLICATION_JSON;
1162                                 buffer_flush(w->response.data);
1163                                 rrd_stats_all_json(w->response.data);
1164                         }
1165                         else if(strcmp(tok, "netdata.conf") == 0) {
1166                                 code = 200;
1167                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
1168
1169                                 w->response.data->contenttype = CT_TEXT_PLAIN;
1170                                 buffer_flush(w->response.data);
1171                                 generate_config(w->response.data, 0);
1172                         }
1173                         else {
1174                                 char filename[FILENAME_MAX+1];
1175                                 url = filename;
1176                                 strncpy(filename, w->last_url, FILENAME_MAX);
1177                                 filename[FILENAME_MAX] = '\0';
1178                                 tok = mystrsep(&url, "?");
1179                                 buffer_flush(w->response.data);
1180                                 code = mysendfile(w, (tok && *tok)?tok:"/");
1181                         }
1182                 }
1183                 else {
1184                         strcpy(w->last_url, "not a valid response");
1185
1186                         if(buf) debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, buf);
1187
1188                         code = 500;
1189                         buffer_flush(w->response.data);
1190                         buffer_strcat(w->response.data, "I don't understand you...\r\n");
1191                 }
1192
1193                 // free url_decode() buffer
1194                 if(pointer_to_free) free(pointer_to_free);
1195         }
1196         else if(w->response.data->len > TOO_BIG_REQUEST) {
1197                 strcpy(w->last_url, "too big request");
1198
1199                 debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
1200
1201                 code = 400;
1202                 buffer_flush(w->response.data);
1203                 buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
1204         }
1205         else {
1206                 // wait for more data
1207                 w->wait_receive = 1;
1208                 return;
1209         }
1210
1211         gettimeofday(&w->tv_ready, NULL);
1212         w->response.data->date = time(NULL);
1213         w->response.sent = 0;
1214         w->response.code = code;
1215
1216         // prepare the HTTP response header
1217         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
1218
1219         char *content_type_string;
1220         switch(w->response.data->contenttype) {
1221                 case CT_TEXT_HTML:
1222                         content_type_string = "text/html; charset=utf-8";
1223                         break;
1224
1225                 case CT_APPLICATION_XML:
1226                         content_type_string = "application/xml; charset=utf-8";
1227                         break;
1228
1229                 case CT_APPLICATION_JSON:
1230                         content_type_string = "application/json; charset=utf-8";
1231                         break;
1232
1233                 case CT_APPLICATION_X_JAVASCRIPT:
1234                         content_type_string = "application/x-javascript; charset=utf-8";
1235                         break;
1236
1237                 case CT_TEXT_CSS:
1238                         content_type_string = "text/css; charset=utf-8";
1239                         break;
1240
1241                 case CT_TEXT_XML:
1242                         content_type_string = "text/xml; charset=utf-8";
1243                         break;
1244
1245                 case CT_TEXT_XSL:
1246                         content_type_string = "text/xsl; charset=utf-8";
1247                         break;
1248
1249                 case CT_APPLICATION_OCTET_STREAM:
1250                         content_type_string = "application/octet-stream";
1251                         break;
1252
1253                 case CT_IMAGE_SVG_XML:
1254                         content_type_string = "image/svg+xml";
1255                         break;
1256
1257                 case CT_APPLICATION_X_FONT_TRUETYPE:
1258                         content_type_string = "application/x-font-truetype";
1259                         break;
1260
1261                 case CT_APPLICATION_X_FONT_OPENTYPE:
1262                         content_type_string = "application/x-font-opentype";
1263                         break;
1264
1265                 case CT_APPLICATION_FONT_WOFF:
1266                         content_type_string = "application/font-woff";
1267                         break;
1268
1269                 case CT_APPLICATION_FONT_WOFF2:
1270                         content_type_string = "application/font-woff2";
1271                         break;
1272
1273                 case CT_APPLICATION_VND_MS_FONTOBJ:
1274                         content_type_string = "application/vnd.ms-fontobject";
1275                         break;
1276
1277                 case CT_IMAGE_PNG:
1278                         content_type_string = "image/png";
1279                         break;
1280
1281                 case CT_IMAGE_JPG:
1282                         content_type_string = "image/jpeg";
1283                         break;
1284
1285                 case CT_IMAGE_GIF:
1286                         content_type_string = "image/gif";
1287                         break;
1288
1289                 case CT_IMAGE_XICON:
1290                         content_type_string = "image/x-icon";
1291                         break;
1292
1293                 case CT_IMAGE_BMP:
1294                         content_type_string = "image/bmp";
1295                         break;
1296
1297                 case CT_IMAGE_ICNS:
1298                         content_type_string = "image/icns";
1299                         break;
1300
1301                 default:
1302                 case CT_TEXT_PLAIN:
1303                         content_type_string = "text/plain; charset=utf-8";
1304                         break;
1305         }
1306
1307         char *code_msg;
1308         switch(code) {
1309                 case 200:
1310                         code_msg = "OK";
1311                         break;
1312
1313                 case 307:
1314                         code_msg = "Temporary Redirect";
1315                         break;
1316
1317                 case 400:
1318                         code_msg = "Bad Request";
1319                         break;
1320
1321                 case 403:
1322                         code_msg = "Forbidden";
1323                         break;
1324
1325                 case 404:
1326                         code_msg = "Not Found";
1327                         break;
1328
1329                 default:
1330                         code_msg = "Internal Server Error";
1331                         break;
1332         }
1333
1334         char date[100];
1335         struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
1336         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
1337
1338         buffer_sprintf(w->response.header_output,
1339                 "HTTP/1.1 %d %s\r\n"
1340                 "Connection: %s\r\n"
1341                 "Server: NetData Embedded HTTP Server\r\n"
1342                 "Content-Type: %s\r\n"
1343                 "Access-Control-Allow-Origin: *\r\n"
1344                 "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
1345                 "Access-Control-Allow-Headers: accept, x-requested-with\r\n"
1346                 "Access-Control-Max-Age: 86400\r\n"
1347                 "Date: %s\r\n"
1348                 , code, code_msg
1349                 , w->keepalive?"keep-alive":"close"
1350                 , content_type_string
1351                 , date
1352                 );
1353
1354         if(buffer_strlen(w->response.header))
1355                 buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
1356
1357         if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
1358                 buffer_sprintf(w->response.header_output,
1359                         "Expires: %s\r\n"
1360                         "Cache-Control: no-cache\r\n"
1361                         , date);
1362         }
1363         else {
1364                 char edate[100];
1365                 time_t et = w->response.data->date + (86400 * 14);
1366                 struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
1367                 strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
1368
1369                 buffer_sprintf(w->response.header_output,
1370                         "Expires: %s\r\n"
1371                         "Cache-Control: public\r\n"
1372                         , edate);
1373         }
1374
1375         // if we know the content length, put it
1376         if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
1377                 buffer_sprintf(w->response.header_output,
1378                         "Content-Length: %ld\r\n"
1379                         , w->response.data->len? w->response.data->len: w->response.rlen
1380                         );
1381         else if(!w->response.zoutput)
1382                 w->keepalive = 0;       // content-length is required for keep-alive
1383
1384         if(w->response.zoutput) {
1385                 buffer_strcat(w->response.header_output,
1386                         "Content-Encoding: gzip\r\n"
1387                         "Transfer-Encoding: chunked\r\n"
1388                         );
1389         }
1390
1391         buffer_strcat(w->response.header_output, "\r\n");
1392
1393         // disable TCP_NODELAY, to buffer the header
1394         int flag = 0;
1395         if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
1396                 error("%llu: failed to disable TCP_NODELAY on socket.", w->id);
1397
1398         // sent the HTTP header
1399         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
1400                         , w->id
1401                         , buffer_strlen(w->response.header_output)
1402                         , buffer_tostring(w->response.header_output)
1403                         );
1404
1405         bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
1406         if(bytes != (ssize_t) buffer_strlen(w->response.header_output))
1407                 error("%llu: HTTP Header failed to be sent (I sent %d bytes but the system sent %d bytes)."
1408                                 , w->id
1409                                 , buffer_strlen(w->response.header_output)
1410                                 , bytes);
1411         else {
1412                 global_statistics_lock();
1413                 global_statistics.bytes_sent += bytes;
1414                 global_statistics_unlock();
1415         }
1416
1417         // enable TCP_NODELAY, to send all data immediately at the next send()
1418         flag = 1;
1419         if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
1420
1421         // enable sending immediately if we have data
1422         if(w->response.data->len) w->wait_send = 1;
1423         else w->wait_send = 0;
1424
1425         // pretty logging
1426         switch(w->mode) {
1427                 case WEB_CLIENT_MODE_OPTIONS:
1428                         debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
1429                         break;
1430
1431                 case WEB_CLIENT_MODE_NORMAL:
1432                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
1433                         break;
1434
1435                 case WEB_CLIENT_MODE_FILECOPY:
1436                         if(w->response.rlen) {
1437                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
1438                                 w->wait_receive = 1;
1439
1440                                 /*
1441                                 // utilize the kernel sendfile() for copying the file to the socket.
1442                                 // this block of code can be commented, without anything missing.
1443                                 // when it is commented, the program will copy the data using async I/O.
1444                                 {
1445                                         long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
1446                                         if(len != w->response.data->rbytes) error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
1447                                         else web_client_reset(w);
1448                                 }
1449                                 */
1450                         }
1451                         else
1452                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
1453                         break;
1454
1455                 default:
1456                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
1457                         break;
1458         }
1459 }
1460
1461 long web_client_send_chunk_header(struct web_client *w, long len)
1462 {
1463         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
1464         char buf[1024];
1465         sprintf(buf, "%lX\r\n", len);
1466         ssize_t bytes = send(w->ofd, buf, strlen(buf), MSG_DONTWAIT);
1467
1468         if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
1469         else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk header to the client.", w->id);
1470         else debug(D_DEFLATE, "%llu: Failed to send chunk header to client.", w->id);
1471
1472         return bytes;
1473 }
1474
1475 long web_client_send_chunk_close(struct web_client *w)
1476 {
1477         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
1478
1479         ssize_t bytes = send(w->ofd, "\r\n", 2, MSG_DONTWAIT);
1480
1481         if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
1482         else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
1483         else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client.", w->id);
1484
1485         return bytes;
1486 }
1487
1488 long web_client_send_chunk_finalize(struct web_client *w)
1489 {
1490         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
1491
1492         ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, MSG_DONTWAIT);
1493
1494         if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
1495         else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
1496         else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client.", w->id);
1497
1498         return bytes;
1499 }
1500
1501 #ifdef NETDATA_WITH_ZLIB
1502 long web_client_send_deflate(struct web_client *w)
1503 {
1504         long len = 0, t = 0;
1505
1506         // when using compression,
1507         // w->response.sent is the amount of bytes passed through compression
1508
1509         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);
1510
1511         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) {
1512                 // there is nothing to send
1513
1514                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1515
1516                 // finalize the chunk
1517                 if(w->response.sent != 0)
1518                         t += web_client_send_chunk_finalize(w);
1519
1520                 // there can be two cases for this
1521                 // A. we have done everything
1522                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
1523
1524                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->response.rlen && w->response.rlen > w->response.data->len) {
1525                         // we have to wait, more data will come
1526                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1527                         w->wait_send = 0;
1528                         return(0);
1529                 }
1530
1531                 if(w->keepalive == 0) {
1532                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
1533                         errno = 0;
1534                         return(-1);
1535                 }
1536
1537                 // reset the client
1538                 web_client_reset(w);
1539                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
1540                 return(0);
1541         }
1542
1543         if(w->response.zhave == w->response.zsent) {
1544                 // compress more input data
1545
1546                 // close the previous open chunk
1547                 if(w->response.sent != 0) t += web_client_send_chunk_close(w);
1548
1549                 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);
1550
1551                 // give the compressor all the data not passed through the compressor yet
1552                 if(w->response.data->len > w->response.sent) {
1553 #ifdef NETDATA_INTERNAL_CHECKS
1554                         if((long)w->response.sent - (long)w->response.zstream.avail_in < 0)
1555                                 error("internal error: avail_in is corrupted.");
1556 #endif
1557                         w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
1558                         w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
1559                 }
1560
1561                 // reset the compressor output buffer
1562                 w->response.zstream.next_out = w->response.zbuffer;
1563                 w->response.zstream.avail_out = ZLIB_CHUNK;
1564
1565                 // ask for FINISH if we have all the input
1566                 int flush = Z_SYNC_FLUSH;
1567                 if(w->mode == WEB_CLIENT_MODE_NORMAL
1568                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
1569                         flush = Z_FINISH;
1570                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
1571                 }
1572                 else {
1573                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
1574                 }
1575
1576                 // compress
1577                 if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
1578                         error("%llu: Compression failed. Closing down client.", w->id);
1579                         web_client_reset(w);
1580                         return(-1);
1581                 }
1582
1583                 w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
1584                 w->response.zsent = 0;
1585
1586                 // keep track of the bytes passed through the compressor
1587                 w->response.sent = w->response.data->len;
1588
1589                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
1590
1591                 // open a new chunk
1592                 t += web_client_send_chunk_header(w, w->response.zhave);
1593         }
1594
1595         debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
1596
1597         len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
1598         if(len > 0) {
1599                 w->response.zsent += len;
1600                 if(t > 0) len += t;
1601                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
1602         }
1603         else if(len == 0) 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);
1604         else debug(D_WEB_CLIENT, "%llu: Failed to send data to client. Reason: %s", w->id, strerror(errno));
1605
1606         return(len);
1607 }
1608 #endif // NETDATA_WITH_ZLIB
1609
1610 long web_client_send(struct web_client *w)
1611 {
1612 #ifdef NETDATA_WITH_ZLIB
1613         if(likely(w->response.zoutput)) return web_client_send_deflate(w);
1614 #endif // NETDATA_WITH_ZLIB
1615
1616         long bytes;
1617
1618         if(unlikely(w->response.data->len - w->response.sent == 0)) {
1619                 // there is nothing to send
1620
1621                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1622
1623                 // there can be two cases for this
1624                 // A. we have done everything
1625                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
1626
1627                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->response.rlen && w->response.rlen > w->response.data->len) {
1628                         // we have to wait, more data will come
1629                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1630                         w->wait_send = 0;
1631                         return(0);
1632                 }
1633
1634                 if(unlikely(w->keepalive == 0)) {
1635                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
1636                         errno = 0;
1637                         return(-1);
1638                 }
1639
1640                 web_client_reset(w);
1641                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
1642                 return(0);
1643         }
1644
1645         bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
1646         if(likely(bytes > 0)) {
1647                 w->response.sent += bytes;
1648                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
1649         }
1650         else if(likely(bytes == 0)) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
1651         else debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
1652
1653         return(bytes);
1654 }
1655
1656 long web_client_receive(struct web_client *w)
1657 {
1658         // do we have any space for more data?
1659         buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
1660
1661         long left = w->response.data->size - w->response.data->len;
1662         long bytes;
1663
1664         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
1665                 bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
1666         else
1667                 bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
1668
1669         if(likely(bytes > 0)) {
1670                 size_t old = w->response.data->len;
1671                 w->response.data->len += bytes;
1672                 w->response.data->buffer[w->response.data->len] = '\0';
1673
1674                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
1675                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
1676
1677                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
1678                         w->wait_send = 1;
1679                         if(w->response.rlen && w->response.data->len >= w->response.rlen) w->wait_receive = 0;
1680                 }
1681         }
1682         else if(likely(bytes == 0)) {
1683                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
1684
1685                 // if we cannot read, it means we have an error on input.
1686                 // if however, we are copying a file from ifd to ofd, we should not return an error.
1687                 // in this case, the error should be generated when the file has been sent to the client.
1688
1689                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
1690                         // we are copying data from ifd to ofd
1691                         // let it finish copying...
1692                         w->wait_receive = 0;
1693                         debug(D_WEB_CLIENT, "%llu: Disabling input.", w->id);
1694                 }
1695                 else {
1696                         bytes = -1;
1697                         errno = 0;
1698                 }
1699         }
1700
1701         return(bytes);
1702 }
1703
1704
1705 // --------------------------------------------------------------------------------------
1706 // the thread of a single client
1707
1708 // 1. waits for input and output, using async I/O
1709 // 2. it processes HTTP requests
1710 // 3. it generates HTTP responses
1711 // 4. it copies data from input to output if mode is FILECOPY
1712
1713 void *web_client_main(void *ptr)
1714 {
1715         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
1716                 error("Cannot set pthread cancel type to DEFERRED.");
1717
1718         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
1719                 error("Cannot set pthread cancel state to ENABLE.");
1720
1721         struct timeval tv;
1722         struct web_client *w = ptr;
1723         int retval;
1724         fd_set ifds, ofds, efds;
1725         int fdmax = 0;
1726
1727         log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
1728
1729         for(;;) {
1730                 FD_ZERO (&ifds);
1731                 FD_ZERO (&ofds);
1732                 FD_ZERO (&efds);
1733
1734                 FD_SET(w->ifd, &efds);
1735
1736                 if(w->ifd != w->ofd)
1737                         FD_SET(w->ofd, &efds);
1738
1739                 if (w->wait_receive) {
1740                         FD_SET(w->ifd, &ifds);
1741                         if(w->ifd > fdmax) fdmax = w->ifd;
1742                 }
1743
1744                 if (w->wait_send) {
1745                         FD_SET(w->ofd, &ofds);
1746                         if(w->ofd > fdmax) fdmax = w->ofd;
1747                 }
1748
1749                 tv.tv_sec = web_client_timeout;
1750                 tv.tv_usec = 0;
1751
1752                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
1753                 retval = select(fdmax+1, &ifds, &ofds, &efds, &tv);
1754
1755                 if(retval == -1) {
1756                         debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: select() failed.", w->id);
1757                         continue;
1758                 }
1759                 else if(!retval) {
1760                         // timeout
1761                         debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: timeout.", w->id);
1762                         break;
1763                 }
1764
1765                 if(FD_ISSET(w->ifd, &efds)) {
1766                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on input socket.", w->id);
1767                         break;
1768                 }
1769
1770                 if(FD_ISSET(w->ofd, &efds)) {
1771                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on output socket.", w->id);
1772                         break;
1773                 }
1774
1775                 if(w->wait_send && FD_ISSET(w->ofd, &ofds)) {
1776                         long bytes;
1777                         if((bytes = web_client_send(w)) < 0) {
1778                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
1779                                 errno = 0;
1780                                 break;
1781                         }
1782
1783                         global_statistics_lock();
1784                         global_statistics.bytes_sent += bytes;
1785                         global_statistics_unlock();
1786                 }
1787
1788                 if(w->wait_receive && FD_ISSET(w->ifd, &ifds)) {
1789                         long bytes;
1790                         if((bytes = web_client_receive(w)) < 0) {
1791                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
1792                                 errno = 0;
1793                                 break;
1794                         }
1795
1796                         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
1797                                 debug(D_WEB_CLIENT, "%llu: Attempting to process received data (%ld bytes).", w->id, bytes);
1798                                 // info("%llu: Attempting to process received data (%ld bytes).", w->id, bytes);
1799                                 web_client_process(w);
1800                         }
1801
1802                         global_statistics_lock();
1803                         global_statistics.bytes_received += bytes;
1804                         global_statistics_unlock();
1805                 }
1806         }
1807
1808         log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
1809         debug(D_WEB_CLIENT, "%llu: done...", w->id);
1810
1811         web_client_reset(w);
1812         w->obsolete = 1;
1813
1814         return NULL;
1815 }