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 "main.h"
  26 #include "appconfig.h"
  27 #include "url.h"
  28 #include "web_buffer.h"
  29 #include "web_server.h"
  30 #include "global_statistics.h"
  31 #include "rrd.h"
  32 #include "rrd2json.h"
  33 #include "registry.h"
  34 #include "web_buffer_svg.h"
  35 #include "web_client.h"
  36
  37 #define INITIAL_WEB_DATA_LENGTH 16384
  38 #define WEB_REQUEST_LENGTH 16384
  39 #define TOO_BIG_REQUEST 16384
  40
  41 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
  42 int web_donotrack_comply = 0;
  43
  44 #ifdef NETDATA_WITH_ZLIB
  45 int web_enable_gzip = 1, web_gzip_level = 3, web_gzip_strategy = Z_DEFAULT_STRATEGY;
  46 #endif /* NETDATA_WITH_ZLIB */
  47
  48 struct web_client *web_clients = NULL;
  49 unsigned long long web_clients_count = 0;
  50
  51 inline int web_client_crock_socket(struct web_client *w) {
  52 #ifdef TCP_CORK
  53         if(likely(!w->tcp_cork && w->ofd != -1)) {
  54                 w->tcp_cork = 1;
  55                 if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
  56                         error("%llu: failed to enable TCP_CORK on socket.", w->id);
  57                         w->tcp_cork = 0;
  58                         return -1;
  59                 }
  60         }
  61 #endif /* TCP_CORK */
  62
  63         return 0;
  64 }
  65
  66 inline int web_client_uncrock_socket(struct web_client *w) {
  67 #ifdef TCP_CORK
  68         if(likely(w->tcp_cork && w->ofd != -1)) {
  69                 w->tcp_cork = 0;
  70                 if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
  71                         error("%llu: failed to disable TCP_CORK on socket.", w->id);
  72                         w->tcp_cork = 1;
  73                         return -1;
  74                 }
  75         }
  76 #endif /* TCP_CORK */
  77
  78         return 0;
  79 }
  80
  81 struct web_client *web_client_create(int listener)
  82 {
  83         struct web_client *w;
  84
  85         w = calloc(1, sizeof(struct web_client));
  86         if(!w) {
  87                 error("Cannot allocate new web_client memory.");
  88                 return NULL;
  89         }
  90
  91         w->id = ++web_clients_count;
  92         w->mode = WEB_CLIENT_MODE_NORMAL;
  93
  94         {
  95                 struct sockaddr *sadr;
  96                 socklen_t addrlen;
  97
  98                 sadr = (struct sockaddr*) &w->clientaddr;
  99                 addrlen = sizeof(w->clientaddr);
 100
 101                 w->ifd = accept4(listener, sadr, &addrlen, SOCK_NONBLOCK);
 102                 if (w->ifd == -1) {
 103                         error("%llu: Cannot accept new incoming connection.", w->id);
 104                         free(w);
 105                         return NULL;
 106                 }
 107                 w->ofd = w->ifd;
 108
 109                 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 110                         error("Cannot getnameinfo() on received client connection.");
 111                         strncpyz(w->client_ip,   "UNKNOWN", NI_MAXHOST);
 112                         strncpyz(w->client_port, "UNKNOWN", NI_MAXSERV);
 113                 }
 114                 w->client_ip[NI_MAXHOST]   = '\0';
 115                 w->client_port[NI_MAXSERV] = '\0';
 116
 117                 switch(sadr->sa_family) {
 118                 case AF_INET:
 119                         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);
 120                         break;
 121
 122                 case AF_INET6:
 123                         if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
 124                                 strcpy(w->client_ip, &w->client_ip[7]);
 125                                 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);
 126                         }
 127                         else
 128                                 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);
 129                         break;
 130
 131                 default:
 132                         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);
 133                         break;
 134                 }
 135
 136                 int flag = 1;
 137                 if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
 138                         error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
 139
 140                 flag = 1;
 141                 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0)
 142                         error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
 143         }
 144
 145         w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
 146         if(unlikely(!w->response.data)) {
 147                 // no need for error log - web_buffer_create already logged the error
 148                 close(w->ifd);
 149                 free(w);
 150                 return NULL;
 151         }
 152
 153         w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 154         if(unlikely(!w->response.header)) {
 155                 // no need for error log - web_buffer_create already logged the error
 156                 buffer_free(w->response.data);
 157                 close(w->ifd);
 158                 free(w);
 159                 return NULL;
 160         }
 161
 162         w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 163         if(unlikely(!w->response.header_output)) {
 164                 // no need for error log - web_buffer_create already logged the error
 165                 buffer_free(w->response.header);
 166                 buffer_free(w->response.data);
 167                 close(w->ifd);
 168                 free(w);
 169                 return NULL;
 170         }
 171
 172         w->origin[0] = '*';
 173         w->wait_receive = 1;
 174
 175         if(web_clients) web_clients->prev = w;
 176         w->next = web_clients;
 177         web_clients = w;
 178
 179         global_statistics.connected_clients++;
 180
 181         return(w);
 182 }
 183
 184 void web_client_reset(struct web_client *w) {
 185         web_client_uncrock_socket(w);
 186
 187         debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 188
 189         if(likely(w->last_url[0])) {
 190                 struct timeval tv;
 191                 gettimeofday(&tv, NULL);
 192
 193                 size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 194                 size_t sent = size;
 195 #ifdef NETDATA_WITH_ZLIB
 196                 if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
 197 #endif
 198
 199                 // --------------------------------------------------------------------
 200                 // global statistics
 201
 202                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 203                         global_statistics_lock();
 204
 205                 global_statistics.web_requests++;
 206                 global_statistics.web_usec += usecdiff(&tv, &w->tv_in);
 207                 global_statistics.bytes_received += w->stats_received_bytes;
 208                 global_statistics.bytes_sent += w->stats_sent_bytes;
 209                 global_statistics.content_size += size;
 210                 global_statistics.compressed_content_size += sent;
 211
 212                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 213                         global_statistics_unlock();
 214
 215                 w->stats_received_bytes = 0;
 216                 w->stats_sent_bytes = 0;
 217
 218
 219                 // --------------------------------------------------------------------
 220                 // access log
 221
 222                 log_access("%llu: (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
 223                                    w->id,
 224                                    sent, size, -((size > 0) ? ((size - sent) / (double) size * 100.0) : 0.0),
 225                                    usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
 226                                    usecdiff(&tv, &w->tv_ready) / 1000.0,
 227                                    usecdiff(&tv, &w->tv_in) / 1000.0,
 228                                    (w->mode == WEB_CLIENT_MODE_FILECOPY) ? "filecopy" : ((w->mode == WEB_CLIENT_MODE_OPTIONS)
 229                                                                                                                                                  ? "options" : "data"),
 230                                    w->response.code,
 231                                    w->last_url
 232                 );
 233         }
 234
 235         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
 236                 if(w->ifd != w->ofd) {
 237                         debug(D_WEB_CLIENT, "%llu: Closing filecopy input file descriptor %d.", w->id, w->ifd);
 238                         if(w->ifd != -1) close(w->ifd);
 239                         w->ifd = w->ofd;
 240                 }
 241         }
 242
 243         w->last_url[0] = '\0';
 244         w->cookie1[0] = '\0';
 245         w->cookie2[0] = '\0';
 246         w->origin[0] = '*';
 247         w->origin[1] = '\0';
 248
 249         w->mode = WEB_CLIENT_MODE_NORMAL;
 250
 251         w->tcp_cork = 0;
 252         w->donottrack = 0;
 253         w->tracking_required = 0;
 254         w->keepalive = 0;
 255         w->decoded_url[0] = '\0';
 256
 257         buffer_reset(w->response.header_output);
 258         buffer_reset(w->response.header);
 259         buffer_reset(w->response.data);
 260         w->response.rlen = 0;
 261         w->response.sent = 0;
 262         w->response.code = 0;
 263
 264         w->wait_receive = 1;
 265         w->wait_send = 0;
 266
 267         w->response.zoutput = 0;
 268
 269         // if we had enabled compression, release it
 270 #ifdef NETDATA_WITH_ZLIB
 271         if(w->response.zinitialized) {
 272                 debug(D_DEFLATE, "%llu: Freeing compression resources.", w->id);
 273                 deflateEnd(&w->response.zstream);
 274                 w->response.zsent = 0;
 275                 w->response.zhave = 0;
 276                 w->response.zstream.avail_in = 0;
 277                 w->response.zstream.avail_out = 0;
 278                 w->response.zstream.total_in = 0;
 279                 w->response.zstream.total_out = 0;
 280                 w->response.zinitialized = 0;
 281         }
 282 #endif // NETDATA_WITH_ZLIB
 283 }
 284
 285 struct web_client *web_client_free(struct web_client *w) {
 286         web_client_reset(w);
 287
 288         struct web_client *n = w->next;
 289         if(w == web_clients) web_clients = n;
 290
 291         debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 292
 293         if(w->prev)     w->prev->next = w->next;
 294         if(w->next) w->next->prev = w->prev;
 295         if(w->response.header_output) buffer_free(w->response.header_output);
 296         if(w->response.header) buffer_free(w->response.header);
 297         if(w->response.data) buffer_free(w->response.data);
 298         if(w->ifd != -1) close(w->ifd);
 299         if(w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
 300         free(w);
 301
 302         global_statistics.connected_clients--;
 303
 304         return(n);
 305 }
 306
 307 uid_t web_files_uid(void) {
 308         static char *web_owner = NULL;
 309         static uid_t owner_uid = 0;
 310
 311         if(unlikely(!web_owner)) {
 312                 web_owner = config_get("global", "web files owner", config_get("global", "run as user", ""));
 313                 if(!web_owner || !*web_owner)
 314                         owner_uid = geteuid();
 315                 else {
 316                         // getpwnam() is not thread safe,
 317                         // but we have called this function once
 318                         // while single threaded
 319                         struct passwd *pw = getpwnam(web_owner);
 320                         if(!pw) {
 321                                 error("User '%s' is not present. Ignoring option.", web_owner);
 322                                 owner_uid = geteuid();
 323                         }
 324                         else {
 325                                 debug(D_WEB_CLIENT, "Web files owner set to %s.", web_owner);
 326                                 owner_uid = pw->pw_uid;
 327                         }
 328                 }
 329         }
 330
 331         return(owner_uid);
 332 }
 333
 334 gid_t web_files_gid(void) {
 335         static char *web_group = NULL;
 336         static gid_t owner_gid = 0;
 337
 338         if(unlikely(!web_group)) {
 339                 web_group = config_get("global", "web files group", config_get("global", "web files owner", ""));
 340                 if(!web_group || !*web_group)
 341                         owner_gid = getegid();
 342                 else {
 343                         // getgrnam() is not thread safe,
 344                         // but we have called this function once
 345                         // while single threaded
 346                         struct group *gr = getgrnam(web_group);
 347                         if(!gr) {
 348                                 error("Group '%s' is not present. Ignoring option.", web_group);
 349                                 owner_gid = getegid();
 350                         }
 351                         else {
 352                                 debug(D_WEB_CLIENT, "Web files group set to %s.", web_group);
 353                                 owner_gid = gr->gr_gid;
 354                         }
 355                 }
 356         }
 357
 358         return(owner_gid);
 359 }
 360
 361 int mysendfile(struct web_client *w, char *filename)
 362 {
 363         static char *web_dir = NULL;
 364
 365         // initialize our static data
 366         if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
 367
 368         debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
 369
 370         // skip leading slashes
 371         while (*filename == '/') filename++;
 372
 373         // if the filename contain known paths, skip them
 374         if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0)
 375                 filename = &filename[strlen(WEB_PATH_FILE) + 1];
 376
 377         char *s;
 378         for(s = filename; *s ;s++) {
 379                 if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
 380                         debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 381                         buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
 382                         return 400;
 383                 }
 384         }
 385
 386         // if the filename contains a .. refuse to serve it
 387         if(strstr(filename, "..") != 0) {
 388                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 389                 buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
 390                 return 400;
 391         }
 392
 393         // access the file
 394         char webfilename[FILENAME_MAX + 1];
 395         snprintfz(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
 396
 397         // check if the file exists
 398         struct stat stat;
 399         if(lstat(webfilename, &stat) != 0) {
 400                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
 401                 buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
 402                 return 404;
 403         }
 404
 405         // check if the file is owned by expected user
 406         if(stat.st_uid != web_files_uid()) {
 407                 error("%llu: File '%s' is owned by user %d (expected user %d). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
 408                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 409                 return 403;
 410         }
 411
 412         // check if the file is owned by expected group
 413         if(stat.st_gid != web_files_gid()) {
 414                 error("%llu: File '%s' is owned by group %d (expected group %d). Access Denied.", w->id, webfilename, stat.st_gid, web_files_gid());
 415                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 416                 return 403;
 417         }
 418
 419         if((stat.st_mode & S_IFMT) == S_IFDIR) {
 420                 snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
 421                 return mysendfile(w, webfilename);
 422         }
 423
 424         if((stat.st_mode & S_IFMT) != S_IFREG) {
 425                 error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
 426                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 427                 return 403;
 428         }
 429
 430         // open the file
 431         w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
 432         if(w->ifd == -1) {
 433                 w->ifd = w->ofd;
 434
 435                 if(errno == EBUSY || errno == EAGAIN) {
 436                         error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
 437                         buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
 438                         buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
 439                         return 307;
 440                 }
 441                 else {
 442                         error("%llu: Cannot open file '%s'.", w->id, webfilename);
 443                         buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
 444                         return 404;
 445                 }
 446         }
 447         if(fcntl(w->ifd, F_SETFL, O_NONBLOCK) < 0)
 448                 error("%llu: Cannot set O_NONBLOCK on file '%s'.", w->id, webfilename);
 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                         , *refresh_str = NULL
 720                         , *precision_str = NULL;
 721
 722         int group = GROUP_AVERAGE;
 723         uint32_t options = 0x00000000;
 724
 725         while(url) {
 726                 char *value = mystrsep(&url, "/?&[]");
 727                 if(!value || !*value) continue;
 728
 729                 char *name = mystrsep(&value, "=");
 730                 if(!name || !*name) continue;
 731                 if(!value || !*value) continue;
 732
 733                 debug(D_WEB_CLIENT, "%llu: API v1 badge.svg query param '%s' with value '%s'", w->id, name, value);
 734
 735                 // name and value are now the parameters
 736                 // they are not null and not empty
 737
 738                 if(!strcmp(name, "chart")) chart = value;
 739                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 740                         if(!dimensions)
 741                                 dimensions = buffer_create(strlen(value));
 742
 743                         if(dimensions) {
 744                                 buffer_strcat(dimensions, "|");
 745                                 buffer_strcat(dimensions, value);
 746                         }
 747                 }
 748                 else if(!strcmp(name, "after")) after_str = value;
 749                 else if(!strcmp(name, "before")) before_str = value;
 750                 else if(!strcmp(name, "points")) points_str = value;
 751                 else if(!strcmp(name, "group")) {
 752                         group = web_client_api_request_v1_data_group(value);
 753                 }
 754                 else if(!strcmp(name, "options")) {
 755                         options |= web_client_api_request_v1_data_options(value);
 756                 }
 757                 else if(!strcmp(name, "label")) label = value;
 758                 else if(!strcmp(name, "units")) units = value;
 759                 else if(!strcmp(name, "label_color")) label_color = value;
 760                 else if(!strcmp(name, "value_color")) value_color = value;
 761                 else if(!strcmp(name, "multiply")) multiply_str = value;
 762                 else if(!strcmp(name, "divide")) divide_str = value;
 763                 else if(!strcmp(name, "refresh")) refresh_str = value;
 764                 else if(!strcmp(name, "precision")) precision_str = value;
 765         }
 766
 767         if(!chart || !*chart) {
 768                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 769                 goto cleanup;
 770         }
 771
 772         RRDSET *st = rrdset_find(chart);
 773         if(!st) st = rrdset_find_byname(chart);
 774         if(!st) {
 775                 buffer_svg(w->response.data, "chart not found", 0, "", NULL, NULL, 1, -1);
 776                 ret = 200;
 777                 goto cleanup;
 778         }
 779
 780         long long multiply  = (multiply_str  && *multiply_str )?atol(multiply_str):1;
 781         long long divide    = (divide_str    && *divide_str   )?atol(divide_str):1;
 782         long long before    = (before_str    && *before_str   )?atol(before_str):0;
 783         long long after     = (after_str     && *after_str    )?atol(after_str):-st->update_every;
 784         int       points    = (points_str    && *points_str   )?atoi(points_str):1;
 785         int       precision = (precision_str && *precision_str)?atoi(precision_str):-1;
 786
 787         int refresh = 0;
 788         if(refresh_str && *refresh_str) {
 789                 if(!strcmp(refresh_str, "auto")) {
 790                         if(options & RRDR_OPTION_NOT_ALIGNED)
 791                                 refresh = st->update_every;
 792                         else {
 793                                 refresh = (before - after);
 794                                 if(refresh < 0) refresh = -refresh;
 795                         }
 796                 }
 797                 else {
 798                         refresh = atoi(refresh_str);
 799                         if(refresh < 0) refresh = -refresh;
 800                 }
 801         }
 802
 803         if(!label) {
 804                 if(dimensions) {
 805                         const char *dim = buffer_tostring(dimensions);
 806                         if(*dim == '|') dim++;
 807                         label = dim;
 808                 }
 809                 else
 810                         label = st->name;
 811         }
 812         if(!units) {
 813                 if(options & RRDR_OPTION_PERCENTAGE)
 814                         units="%";
 815                 else
 816                         units = st->units;
 817         }
 818
 819         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'"
 820                         , w->id
 821                         , chart
 822                         , (dimensions)?buffer_tostring(dimensions):""
 823                         , after
 824                         , before
 825                         , points
 826                         , group
 827                         , options
 828                         );
 829
 830         time_t latest_timestamp = 0;
 831         int value_is_null = 1;
 832         calculated_number n = 0;
 833         ret = 500;
 834
 835         // if the collected value is too old, don't calculate its value
 836         if(rrdset_last_entry_t(st) >= (time(NULL) - (st->update_every * st->gap_when_lost_iterations_above)))
 837                 ret = rrd2value(st, w->response.data, &n, dimensions, points, after, before, group, options, &latest_timestamp, &value_is_null);
 838
 839         // if the value cannot be calculated, show empty badge
 840         if(ret != 200) {
 841                 value_is_null = 1;
 842                 n = 0;
 843                 ret = 200;
 844         }
 845         else if(refresh > 0)
 846                 buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
 847
 848         // render the badge
 849         buffer_svg(w->response.data, label, n * multiply / divide, units, label_color, value_color, value_is_null, precision);
 850
 851 cleanup:
 852         if(dimensions)
 853                 buffer_free(dimensions);
 854         return ret;
 855 }
 856
 857 // returns the HTTP code
 858 int web_client_api_request_v1_data(struct web_client *w, char *url)
 859 {
 860         debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
 861
 862         int ret = 400;
 863         BUFFER *dimensions = NULL;
 864
 865         buffer_flush(w->response.data);
 866
 867         char    *google_version = "0.6",
 868                         *google_reqId = "0",
 869                         *google_sig = "0",
 870                         *google_out = "json",
 871                         *responseHandler = NULL,
 872                         *outFileName = NULL;
 873
 874         time_t last_timestamp_in_data = 0, google_timestamp = 0;
 875
 876         char *chart = NULL
 877                         , *before_str = NULL
 878                         , *after_str = NULL
 879                         , *points_str = NULL;
 880
 881         int group = GROUP_AVERAGE;
 882         uint32_t format = DATASOURCE_JSON;
 883         uint32_t options = 0x00000000;
 884
 885         while(url) {
 886                 char *value = mystrsep(&url, "?&[]");
 887                 if(!value || !*value) continue;
 888
 889                 char *name = mystrsep(&value, "=");
 890                 if(!name || !*name) continue;
 891                 if(!value || !*value) continue;
 892
 893                 debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
 894
 895                 // name and value are now the parameters
 896                 // they are not null and not empty
 897
 898                 if(!strcmp(name, "chart")) chart = value;
 899                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 900                         if(!dimensions) dimensions = buffer_create(strlen(value));
 901                         if(dimensions) {
 902                                 buffer_strcat(dimensions, "|");
 903                                 buffer_strcat(dimensions, value);
 904                         }
 905                 }
 906                 else if(!strcmp(name, "after")) after_str = value;
 907                 else if(!strcmp(name, "before")) before_str = value;
 908                 else if(!strcmp(name, "points")) points_str = value;
 909                 else if(!strcmp(name, "group")) {
 910                         group = web_client_api_request_v1_data_group(value);
 911                 }
 912                 else if(!strcmp(name, "format")) {
 913                         format = web_client_api_request_v1_data_format(value);
 914                 }
 915                 else if(!strcmp(name, "options")) {
 916                         options |= web_client_api_request_v1_data_options(value);
 917                 }
 918                 else if(!strcmp(name, "callback")) {
 919                         responseHandler = value;
 920                 }
 921                 else if(!strcmp(name, "filename")) {
 922                         outFileName = value;
 923                 }
 924                 else if(!strcmp(name, "tqx")) {
 925                         // parse Google Visualization API options
 926                         // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
 927                         char *tqx_name, *tqx_value;
 928
 929                         while(value) {
 930                                 tqx_value = mystrsep(&value, ";");
 931                                 if(!tqx_value || !*tqx_value) continue;
 932
 933                                 tqx_name = mystrsep(&tqx_value, ":");
 934                                 if(!tqx_name || !*tqx_name) continue;
 935                                 if(!tqx_value || !*tqx_value) continue;
 936
 937                                 if(!strcmp(tqx_name, "version"))
 938                                         google_version = tqx_value;
 939                                 else if(!strcmp(tqx_name, "reqId"))
 940                                         google_reqId = tqx_value;
 941                                 else if(!strcmp(tqx_name, "sig")) {
 942                                         google_sig = tqx_value;
 943                                         google_timestamp = strtoul(google_sig, NULL, 0);
 944                                 }
 945                                 else if(!strcmp(tqx_name, "out")) {
 946                                         google_out = tqx_value;
 947                                         format = web_client_api_request_v1_data_google_format(google_out);
 948                                 }
 949                                 else if(!strcmp(tqx_name, "responseHandler"))
 950                                         responseHandler = tqx_value;
 951                                 else if(!strcmp(tqx_name, "outFileName"))
 952                                         outFileName = tqx_value;
 953                         }
 954                 }
 955         }
 956
 957         if(!chart || !*chart) {
 958                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 959                 goto cleanup;
 960         }
 961
 962         RRDSET *st = rrdset_find(chart);
 963         if(!st) st = rrdset_find_byname(chart);
 964         if(!st) {
 965                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 966                 ret = 404;
 967                 goto cleanup;
 968         }
 969
 970         long long before = (before_str && *before_str)?atol(before_str):0;
 971         long long after  = (after_str  && *after_str) ?atol(after_str):0;
 972         int       points = (points_str && *points_str)?atoi(points_str):0;
 973
 974         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'"
 975                         , w->id
 976                         , chart
 977                         , (dimensions)?buffer_tostring(dimensions):""
 978                         , after
 979                         , before
 980                         , points
 981                         , group
 982                         , format
 983                         , options
 984                         );
 985
 986         if(outFileName && *outFileName) {
 987                 buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
 988                 debug(D_WEB_CLIENT, "%llu: generating outfilename header: '%s'", w->id, outFileName);
 989         }
 990
 991         if(format == DATASOURCE_DATATABLE_JSONP) {
 992                 if(responseHandler == NULL)
 993                         responseHandler = "google.visualization.Query.setResponse";
 994
 995                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 996                                 w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
 997                         );
 998
 999                 buffer_sprintf(w->response.data,
1000                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
1001                         responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1002         }
1003         else if(format == DATASOURCE_JSONP) {
1004                 if(responseHandler == NULL)
1005                         responseHandler = "callback";
1006
1007                 buffer_strcat(w->response.data, responseHandler);
1008                 buffer_strcat(w->response.data, "(");
1009         }
1010
1011         ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
1012
1013         if(format == DATASOURCE_DATATABLE_JSONP) {
1014                 if(google_timestamp < last_timestamp_in_data)
1015                         buffer_strcat(w->response.data, "});");
1016
1017                 else {
1018                         // the client already has the latest data
1019                         buffer_flush(w->response.data);
1020                         buffer_sprintf(w->response.data,
1021                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1022                                 responseHandler, google_version, google_reqId);
1023                 }
1024         }
1025         else if(format == DATASOURCE_JSONP)
1026                 buffer_strcat(w->response.data, ");");
1027
1028 cleanup:
1029         if(dimensions) buffer_free(dimensions);
1030         return ret;
1031 }
1032
1033 int web_client_api_request_v1_registry(struct web_client *w, char *url)
1034 {
1035         static uint32_t hash_action = 0, hash_access = 0, hash_hello = 0, hash_delete = 0, hash_search = 0,
1036                         hash_switch = 0, hash_machine = 0, hash_url = 0, hash_name = 0, hash_delete_url = 0, hash_for = 0,
1037                         hash_to = 0 /*, hash_redirects = 0 */;
1038
1039         if(unlikely(!hash_action)) {
1040                 hash_action = simple_hash("action");
1041                 hash_access = simple_hash("access");
1042                 hash_hello = simple_hash("hello");
1043                 hash_delete = simple_hash("delete");
1044                 hash_search = simple_hash("search");
1045                 hash_switch = simple_hash("switch");
1046                 hash_machine = simple_hash("machine");
1047                 hash_url = simple_hash("url");
1048                 hash_name = simple_hash("name");
1049                 hash_delete_url = simple_hash("delete_url");
1050                 hash_for = simple_hash("for");
1051                 hash_to = simple_hash("to");
1052 /*
1053                 hash_redirects = simple_hash("redirects");
1054 */
1055         }
1056
1057         char person_guid[36 + 1] = "";
1058
1059         debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
1060
1061         // FIXME
1062         // The browser may send multiple cookies with our id
1063
1064         char *cookie = strstr(w->response.data->buffer, NETDATA_REGISTRY_COOKIE_NAME "=");
1065         if(cookie)
1066                 strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME)], 36);
1067
1068         char action = '\0';
1069         char *machine_guid = NULL,
1070                         *machine_url = NULL,
1071                         *url_name = NULL,
1072                         *search_machine_guid = NULL,
1073                         *delete_url = NULL,
1074                         *to_person_guid = NULL;
1075 /*
1076         int redirects = 0;
1077 */
1078
1079         while(url) {
1080                 char *value = mystrsep(&url, "?&[]");
1081                 if (!value || !*value) continue;
1082
1083                 char *name = mystrsep(&value, "=");
1084                 if (!name || !*name) continue;
1085                 if (!value || !*value) continue;
1086
1087                 debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
1088
1089                 uint32_t hash = simple_hash(name);
1090
1091                 if(hash == hash_action && !strcmp(name, "action")) {
1092                         uint32_t vhash = simple_hash(value);
1093
1094                         if(vhash == hash_access && !strcmp(value, "access")) action = 'A';
1095                         else if(vhash == hash_hello && !strcmp(value, "hello")) action = 'H';
1096                         else if(vhash == hash_delete && !strcmp(value, "delete")) action = 'D';
1097                         else if(vhash == hash_search && !strcmp(value, "search")) action = 'S';
1098                         else if(vhash == hash_switch && !strcmp(value, "switch")) action = 'W';
1099 #ifdef NETDATA_INTERNAL_CHECKS
1100             else error("unknown registry action '%s'", value);
1101 #endif /* NETDATA_INTERNAL_CHECKS */
1102                 }
1103 /*
1104                 else if(hash == hash_redirects && !strcmp(name, "redirects"))
1105                         redirects = atoi(value);
1106 */
1107                 else if(hash == hash_machine && !strcmp(name, "machine"))
1108                         machine_guid = value;
1109
1110                 else if(hash == hash_url && !strcmp(name, "url"))
1111                         machine_url = value;
1112
1113                 else if(action == 'A') {
1114                         if(hash == hash_name && !strcmp(name, "name"))
1115                                 url_name = value;
1116                 }
1117                 else if(action == 'D') {
1118                         if(hash == hash_delete_url && !strcmp(name, "delete_url"))
1119                                 delete_url = value;
1120                 }
1121                 else if(action == 'S') {
1122                         if(hash == hash_for && !strcmp(name, "for"))
1123                                 search_machine_guid = value;
1124                 }
1125                 else if(action == 'W') {
1126                         if(hash == hash_to && !strcmp(name, "to"))
1127                                 to_person_guid = value;
1128                 }
1129 #ifdef NETDATA_INTERNAL_CHECKS
1130                 else error("unused registry URL parameter '%s' with value '%s'", name, value);
1131 #endif /* NETDATA_INTERNAL_CHECKS */
1132         }
1133
1134         if(web_donotrack_comply && w->donottrack) {
1135                 buffer_flush(w->response.data);
1136                 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.");
1137                 return 400;
1138         }
1139
1140         if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
1141                 buffer_flush(w->response.data);
1142                 buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
1143                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
1144                 return 400;
1145         }
1146         else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
1147                 buffer_flush(w->response.data);
1148                 buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
1149                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
1150                 return 400;
1151         }
1152         else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
1153                 buffer_flush(w->response.data);
1154                 buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
1155                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
1156                 return 400;
1157         }
1158         else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
1159                 buffer_flush(w->response.data);
1160                 buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
1161                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
1162                 return 400;
1163         }
1164
1165         switch(action) {
1166                 case 'A':
1167                         w->tracking_required = 1;
1168                         if(registry_verify_cookies_redirects() > 0 && (!cookie || !person_guid[0])) {
1169                                 buffer_flush(w->response.data);
1170
1171                                 registry_set_cookie(w, "give-me-back-this-cookie-please");
1172                                 w->response.data->contenttype = CT_APPLICATION_JSON;
1173                                 buffer_sprintf(w->response.data, "{ \"status\": \"redirect\", \"registry\": \"%s\" }", registry_to_announce());
1174                                 return 200;
1175
1176 /*
1177  * it seems that web browsers are ignoring 307 (Moved Temporarily)
1178  * under certain conditions, when using CORS
1179  * so this is commented and we use application level redirects instead
1180  *
1181                                 redirects++;
1182
1183                                 if(redirects > registry_verify_cookies_redirects()) {
1184                                         buffer_flush(w->response.data);
1185                                         buffer_sprintf(w->response.data, "Your browser does not support cookies");
1186                                         return 400;
1187                                 }
1188
1189                                 char *encoded_url = url_encode(machine_url);
1190                                 if(!encoded_url) {
1191                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_url);
1192                                         return 500;
1193                                 }
1194
1195                                 char *encoded_name = url_encode(url_name);
1196                                 if(!encoded_name) {
1197                                         free(encoded_url);
1198                                         error("%llu: Cannot URL encode string '%s'", w->id, url_name);
1199                                         return 500;
1200                                 }
1201
1202                                 char *encoded_guid = url_encode(machine_guid);
1203                                 if(!encoded_guid) {
1204                                         free(encoded_url);
1205                                         free(encoded_name);
1206                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_guid);
1207                                         return 500;
1208                                 }
1209
1210                                 buffer_sprintf(w->response.header, "Location: %s/api/v1/registry?action=access&machine=%s&name=%s&url=%s&redirects=%d\r\n",
1211                                                            registry_to_announce(), encoded_guid, encoded_name, encoded_url, redirects);
1212
1213                                 free(encoded_guid);
1214                                 free(encoded_name);
1215                                 free(encoded_url);
1216                                 return 307
1217 */
1218                         }
1219                         return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
1220
1221                 case 'D':
1222                         w->tracking_required = 1;
1223                         return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
1224
1225                 case 'S':
1226                         w->tracking_required = 1;
1227                         return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
1228
1229                 case 'W':
1230                         w->tracking_required = 1;
1231                         return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
1232
1233                 case 'H':
1234                         return registry_request_hello_json(w);
1235
1236                 default:
1237                         buffer_flush(w->response.data);
1238                         buffer_sprintf(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
1239                         return 400;
1240         }
1241
1242         buffer_flush(w->response.data);
1243         buffer_sprintf(w->response.data, "Invalid or no registry action.");
1244         return 400;
1245 }
1246
1247 int web_client_api_request_v1(struct web_client *w, char *url) {
1248         static uint32_t hash_data = 0, hash_chart = 0, hash_charts = 0, hash_registry = 0, hash_badge = 0;
1249
1250         if(unlikely(hash_data == 0)) {
1251                 hash_data = simple_hash("data");
1252                 hash_chart = simple_hash("chart");
1253                 hash_charts = simple_hash("charts");
1254                 hash_registry = simple_hash("registry");
1255                 hash_badge = simple_hash("badge.svg");
1256         }
1257
1258         // get the command
1259         char *tok = mystrsep(&url, "/?&");
1260         if(tok && *tok) {
1261                 debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
1262                 uint32_t hash = simple_hash(tok);
1263
1264                 if(hash == hash_data && !strcmp(tok, "data"))
1265                         return web_client_api_request_v1_data(w, url);
1266
1267                 else if(hash == hash_chart && !strcmp(tok, "chart"))
1268                         return web_client_api_request_v1_chart(w, url);
1269
1270                 else if(hash == hash_charts && !strcmp(tok, "charts"))
1271                         return web_client_api_request_v1_charts(w, url);
1272
1273                 else if(hash == hash_registry && !strcmp(tok, "registry"))
1274                         return web_client_api_request_v1_registry(w, url);
1275
1276                 else if(hash == hash_badge && !strcmp(tok, "badge.svg"))
1277                         return web_client_api_v1_badge(w, url);
1278
1279                 else {
1280                         buffer_flush(w->response.data);
1281                         buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
1282                         return 404;
1283                 }
1284         }
1285         else {
1286                 buffer_flush(w->response.data);
1287                 buffer_sprintf(w->response.data, "API v1 command?");
1288                 return 400;
1289         }
1290 }
1291
1292 int web_client_api_request(struct web_client *w, char *url)
1293 {
1294         // get the api version
1295         char *tok = mystrsep(&url, "/?&");
1296         if(tok && *tok) {
1297                 debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
1298                 if(strcmp(tok, "v1") == 0)
1299                         return web_client_api_request_v1(w, url);
1300                 else {
1301                         buffer_flush(w->response.data);
1302                         buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
1303                         return 404;
1304                 }
1305         }
1306         else {
1307                 buffer_flush(w->response.data);
1308                 buffer_sprintf(w->response.data, "Which API version?");
1309                 return 400;
1310         }
1311 }
1312
1313 int web_client_api_old_data_request(struct web_client *w, char *url, int datasource_type)
1314 {
1315         RRDSET *st = NULL;
1316
1317         char *args = strchr(url, '?');
1318         if(args) {
1319                 *args='\0';
1320                 args = &args[1];
1321         }
1322
1323         // get the name of the data to show
1324         char *tok = mystrsep(&url, "/");
1325
1326         // do we have such a data set?
1327         if(tok && *tok) {
1328                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1329                 st = rrdset_find_byname(tok);
1330                 if(!st) st = rrdset_find(tok);
1331         }
1332
1333         if(!st) {
1334                 // we don't have it
1335                 // try to send a file with that name
1336                 buffer_flush(w->response.data);
1337                 return(mysendfile(w, tok));
1338         }
1339
1340         // we have it
1341         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
1342
1343         // how many entries does the client want?
1344         int lines = rrd_default_history_entries;
1345         int group_count = 1;
1346         time_t after = 0, before = 0;
1347         int group_method = GROUP_AVERAGE;
1348         int nonzero = 0;
1349
1350         if(url) {
1351                 // parse the lines required
1352                 tok = mystrsep(&url, "/");
1353                 if(tok) lines = atoi(tok);
1354                 if(lines < 1) lines = 1;
1355         }
1356         if(url) {
1357                 // parse the group count required
1358                 tok = mystrsep(&url, "/");
1359                 if(tok && *tok) group_count = atoi(tok);
1360                 if(group_count < 1) group_count = 1;
1361                 //if(group_count > save_history / 20) group_count = save_history / 20;
1362         }
1363         if(url) {
1364                 // parse the grouping method required
1365                 tok = mystrsep(&url, "/");
1366                 if(tok && *tok) {
1367                         if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
1368                         else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
1369                         else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
1370                         else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
1371                 }
1372         }
1373         if(url) {
1374                 // parse after time
1375                 tok = mystrsep(&url, "/");
1376                 if(tok && *tok) after = strtoul(tok, NULL, 10);
1377                 if(after < 0) after = 0;
1378         }
1379         if(url) {
1380                 // parse before time
1381                 tok = mystrsep(&url, "/");
1382                 if(tok && *tok) before = strtoul(tok, NULL, 10);
1383                 if(before < 0) before = 0;
1384         }
1385         if(url) {
1386                 // parse nonzero
1387                 tok = mystrsep(&url, "/");
1388                 if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
1389         }
1390
1391         w->response.data->contenttype = CT_APPLICATION_JSON;
1392         buffer_flush(w->response.data);
1393
1394         char *google_version = "0.6";
1395         char *google_reqId = "0";
1396         char *google_sig = "0";
1397         char *google_out = "json";
1398         char *google_responseHandler = "google.visualization.Query.setResponse";
1399         char *google_outFileName = NULL;
1400         time_t last_timestamp_in_data = 0;
1401         if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
1402
1403                 w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1404
1405                 while(args) {
1406                         tok = mystrsep(&args, "&");
1407                         if(tok && *tok) {
1408                                 char *name = mystrsep(&tok, "=");
1409                                 if(name && *name && strcmp(name, "tqx") == 0) {
1410                                         char *key = mystrsep(&tok, ":");
1411                                         char *value = mystrsep(&tok, ";");
1412                                         if(key && value && *key && *value) {
1413                                                 if(strcmp(key, "version") == 0)
1414                                                         google_version = value;
1415
1416                                                 else if(strcmp(key, "reqId") == 0)
1417                                                         google_reqId = value;
1418
1419                                                 else if(strcmp(key, "sig") == 0)
1420                                                         google_sig = value;
1421
1422                                                 else if(strcmp(key, "out") == 0)
1423                                                         google_out = value;
1424
1425                                                 else if(strcmp(key, "responseHandler") == 0)
1426                                                         google_responseHandler = value;
1427
1428                                                 else if(strcmp(key, "outFileName") == 0)
1429                                                         google_outFileName = value;
1430                                         }
1431                                 }
1432                         }
1433                 }
1434
1435                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
1436                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
1437                         );
1438
1439                 if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1440                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
1441
1442                         // check the client wants json
1443                         if(strcmp(google_out, "json") != 0) {
1444                                 buffer_sprintf(w->response.data,
1445                                         "%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.'}]});",
1446                                         google_responseHandler, google_version, google_reqId, google_out);
1447                                         return 200;
1448                         }
1449                 }
1450         }
1451
1452         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1453                 buffer_sprintf(w->response.data,
1454                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
1455                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1456         }
1457
1458         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending RRD data '%s' (id %s, %d lines, %d group, %d group_method, %lu after, %lu before).",
1459                 w->id, st->name, st->id, lines, group_count, group_method, after, before);
1460
1461         time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, (unsigned long)after, (unsigned long)before, nonzero);
1462
1463         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1464                 if(timestamp_in_data > last_timestamp_in_data)
1465                         buffer_strcat(w->response.data, "});");
1466
1467                 else {
1468                         // the client already has the latest data
1469                         buffer_flush(w->response.data);
1470                         buffer_sprintf(w->response.data,
1471                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1472                                 google_responseHandler, google_version, google_reqId);
1473                 }
1474         }
1475
1476         return 200;
1477 }
1478
1479 const char *web_content_type_to_string(uint8_t contenttype) {
1480         switch(contenttype) {
1481                 case CT_TEXT_HTML:
1482                         return "text/html; charset=utf-8";
1483
1484                 case CT_APPLICATION_XML:
1485                         return "application/xml; charset=utf-8";
1486
1487                 case CT_APPLICATION_JSON:
1488                         return "application/json; charset=utf-8";
1489
1490                 case CT_APPLICATION_X_JAVASCRIPT:
1491                         return "application/x-javascript; charset=utf-8";
1492
1493                 case CT_TEXT_CSS:
1494                         return "text/css; charset=utf-8";
1495
1496                 case CT_TEXT_XML:
1497                         return "text/xml; charset=utf-8";
1498
1499                 case CT_TEXT_XSL:
1500                         return "text/xsl; charset=utf-8";
1501
1502                 case CT_APPLICATION_OCTET_STREAM:
1503                         return "application/octet-stream";
1504
1505                 case CT_IMAGE_SVG_XML:
1506                         return "image/svg+xml";
1507
1508                 case CT_APPLICATION_X_FONT_TRUETYPE:
1509                         return "application/x-font-truetype";
1510
1511                 case CT_APPLICATION_X_FONT_OPENTYPE:
1512                         return "application/x-font-opentype";
1513
1514                 case CT_APPLICATION_FONT_WOFF:
1515                         return "application/font-woff";
1516
1517                 case CT_APPLICATION_FONT_WOFF2:
1518                         return "application/font-woff2";
1519
1520                 case CT_APPLICATION_VND_MS_FONTOBJ:
1521                         return "application/vnd.ms-fontobject";
1522
1523                 case CT_IMAGE_PNG:
1524                         return "image/png";
1525
1526                 case CT_IMAGE_JPG:
1527                         return "image/jpeg";
1528
1529                 case CT_IMAGE_GIF:
1530                         return "image/gif";
1531
1532                 case CT_IMAGE_XICON:
1533                         return "image/x-icon";
1534
1535                 case CT_IMAGE_BMP:
1536                         return "image/bmp";
1537
1538                 case CT_IMAGE_ICNS:
1539                         return "image/icns";
1540
1541                 default:
1542                 case CT_TEXT_PLAIN:
1543                         return "text/plain; charset=utf-8";
1544         }
1545 }
1546
1547
1548 const char *web_response_code_to_string(int code) {
1549         switch(code) {
1550                 case 200:
1551                         return "OK";
1552
1553                 case 307:
1554                         return "Temporary Redirect";
1555
1556                 case 400:
1557                         return "Bad Request";
1558
1559                 case 403:
1560                         return "Forbidden";
1561
1562                 case 404:
1563                         return "Not Found";
1564
1565                 case 412:
1566                         return "Preconditions Failed";
1567
1568                 default:
1569                         if(code >= 100 && code < 200)
1570                                 return "Informational";
1571
1572                         if(code >= 200 && code < 300)
1573                                 return "Successful";
1574
1575                         if(code >= 300 && code < 400)
1576                                 return "Redirection";
1577
1578                         if(code >= 400 && code < 500)
1579                                 return "Bad Request";
1580
1581                         if(code >= 500 && code < 600)
1582                                 return "Server Error";
1583
1584                         return "Undefined Error";
1585         }
1586 }
1587
1588 static inline char *http_header_parse(struct web_client *w, char *s) {
1589         static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0;
1590
1591         if(unlikely(!hash_origin)) {
1592                 hash_origin = simple_uhash("Origin");
1593                 hash_connection = simple_uhash("Connection");
1594                 hash_accept_encoding = simple_uhash("Accept-Encoding");
1595                 hash_donottrack = simple_uhash("DNT");
1596         }
1597
1598         char *e = s;
1599
1600         // find the :
1601         while(*e && *e != ':') e++;
1602         if(!*e) return e;
1603
1604         // get the name
1605         *e = '\0';
1606
1607         // find the value
1608         char *v = e + 1, *ve;
1609
1610         // skip leading spaces from value
1611         while(*v == ' ') v++;
1612         ve = v;
1613
1614         // find the \r
1615         while(*ve && *ve != '\r') ve++;
1616         if(!*ve || ve[1] != '\n') {
1617                 *e = ':';
1618                 return ve;
1619         }
1620
1621         // terminate the value
1622         *ve = '\0';
1623
1624         // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
1625         uint32_t hash = simple_uhash(s);
1626
1627         if(hash == hash_origin && !strcasecmp(s, "Origin"))
1628                 strncpyz(w->origin, v, ORIGIN_MAX);
1629
1630         else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
1631                 if(strcasestr(v, "keep-alive"))
1632                         w->keepalive = 1;
1633         }
1634         else if(web_donotrack_comply && hash == hash_donottrack && !strcasecmp(s, "DNT")) {
1635                 if(*v == '0') w->donottrack = 0;
1636                 else if(*v == '1') w->donottrack = 1;
1637         }
1638 #ifdef NETDATA_WITH_ZLIB
1639         else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
1640                 if(web_enable_gzip) {
1641                         if(strcasestr(v, "gzip"))
1642                                 web_client_enable_deflate(w, 1);
1643                         //
1644                         // does not seem to work
1645                         // else if(strcasestr(v, "deflate"))
1646                         //      web_client_enable_deflate(w, 0);
1647                 }
1648         }
1649 #endif /* NETDATA_WITH_ZLIB */
1650
1651         *e = ':';
1652         *ve = '\r';
1653         return ve;
1654 }
1655
1656 // http_request_validate()
1657 // returns:
1658 // = 0 : all good, process the request
1659 // > 0 : request is not supported
1660 // < 0 : request is incomplete - wait for more data
1661
1662 static inline int http_request_validate(struct web_client *w) {
1663         char *s = w->response.data->buffer, *encoded_url = NULL;
1664
1665         // is is a valid request?
1666         if(!strncmp(s, "GET ", 4)) {
1667                 encoded_url = s = &s[4];
1668                 w->mode = WEB_CLIENT_MODE_NORMAL;
1669         }
1670         else if(!strncmp(s, "OPTIONS ", 8)) {
1671                 encoded_url = s = &s[8];
1672                 w->mode = WEB_CLIENT_MODE_OPTIONS;
1673         }
1674         else {
1675                 w->wait_receive = 0;
1676                 return 1;
1677         }
1678
1679         // find the SPACE + "HTTP/"
1680         while(*s) {
1681                 // find the next space
1682                 while (*s && *s != ' ') s++;
1683
1684                 // is it SPACE + "HTTP/" ?
1685                 if(*s && !strncmp(s, " HTTP/", 6)) break;
1686                 else s++;
1687         }
1688
1689         // incomplete requests
1690         if(unlikely(!*s)) {
1691                 w->wait_receive = 1;
1692                 return -2;
1693         }
1694
1695         // we have the end of encoded_url - remember it
1696         char *ue = s;
1697
1698         // make sure we have complete request
1699         // complete requests contain: \r\n\r\n
1700         while(*s) {
1701                 // find a line feed
1702                 while(*s && *s++ != '\r');
1703
1704                 // did we reach the end?
1705                 if(unlikely(!*s)) break;
1706
1707                 // is it \r\n ?
1708                 if(likely(*s++ == '\n')) {
1709
1710                         // is it again \r\n ? (header end)
1711                         if(unlikely(*s == '\r' && s[1] == '\n')) {
1712                                 // a valid complete HTTP request found
1713
1714                                 *ue = '\0';
1715                                 url_decode_r(w->decoded_url, encoded_url, URL_MAX + 1);
1716                                 *ue = ' ';
1717
1718                                 // copy the URL - we are going to overwrite parts of it
1719                                 // FIXME -- we should avoid it
1720                                 strncpyz(w->last_url, w->decoded_url, URL_MAX);
1721
1722                                 w->wait_receive = 0;
1723                                 return 0;
1724                         }
1725
1726                         // another header line
1727                         s = http_header_parse(w, s);
1728                 }
1729         }
1730
1731         // incomplete request
1732         w->wait_receive = 1;
1733         return -3;
1734 }
1735
1736 void web_client_process(struct web_client *w) {
1737         static uint32_t hash_api = 0, hash_netdata_conf = 0, hash_data = 0, hash_datasource = 0, hash_graph = 0,
1738                         hash_list = 0, hash_all_json = 0, hash_exit = 0, hash_debug = 0, hash_mirror = 0;
1739
1740         if(unlikely(!hash_api)) {
1741                 hash_api = simple_hash("api");
1742                 hash_netdata_conf = simple_hash("netdata.conf");
1743                 hash_data = simple_hash(WEB_PATH_DATA);
1744                 hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
1745                 hash_graph = simple_hash(WEB_PATH_GRAPH);
1746                 hash_list = simple_hash("list");
1747                 hash_all_json = simple_hash("all.json");
1748                 hash_exit = simple_hash("exit");
1749                 hash_debug = simple_hash("debug");
1750                 hash_mirror = simple_hash("mirror");
1751         }
1752
1753         int code = 500;
1754         ssize_t bytes;
1755
1756         int what_to_do = http_request_validate(w);
1757
1758         // wait for more data
1759         if(what_to_do < 0) {
1760                 if(w->response.data->len > TOO_BIG_REQUEST) {
1761                         strcpy(w->last_url, "too big request");
1762
1763                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
1764
1765                         code = 400;
1766                         buffer_flush(w->response.data);
1767                         buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
1768                 }
1769                 else {
1770                         // wait for more data
1771                         return;
1772                 }
1773         }
1774         else if(what_to_do > 0) {
1775                 strcpy(w->last_url, "not a valid request");
1776
1777                 debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
1778
1779                 code = 500;
1780                 buffer_flush(w->response.data);
1781                 buffer_strcat(w->response.data, "I don't understand you...\r\n");
1782         }
1783         else { // what_to_do == 0
1784                 gettimeofday(&w->tv_in, NULL);
1785
1786                 if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1787                         code = 200;
1788                         w->response.data->contenttype = CT_TEXT_PLAIN;
1789                         buffer_flush(w->response.data);
1790                         buffer_strcat(w->response.data, "OK");
1791                 }
1792                 else {
1793                         char *url = w->decoded_url;
1794                         char *tok = mystrsep(&url, "/?");
1795                         if(tok && *tok) {
1796                                 uint32_t hash = simple_hash(tok);
1797                                 debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
1798
1799                                 if(hash == hash_api && strcmp(tok, "api") == 0) {
1800                                         // the client is requesting api access
1801                                         code = web_client_api_request(w, url);
1802                                 }
1803                                 else if(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0) {
1804                                         code = 200;
1805                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
1806
1807                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1808                                         buffer_flush(w->response.data);
1809                                         generate_config(w->response.data, 0);
1810                                 }
1811                                 else if(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
1812                                         // the client is requesting rrd data -- OLD API
1813                                         code = web_client_api_old_data_request(w, url, DATASOURCE_JSON);
1814                                 }
1815                                 else if(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
1816                                         // the client is requesting google datasource -- OLD API
1817                                         code = web_client_api_old_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
1818                                 }
1819                                 else if(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
1820                                         // the client is requesting an rrd graph -- OLD API
1821
1822                                         // get the name of the data to show
1823                                         tok = mystrsep(&url, "/?&");
1824                                         if(tok && *tok) {
1825                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1826
1827                                                 // do we have such a data set?
1828                                                 RRDSET *st = rrdset_find_byname(tok);
1829                                                 if(!st) st = rrdset_find(tok);
1830                                                 if(!st) {
1831                                                         // we don't have it
1832                                                         // try to send a file with that name
1833                                                         buffer_flush(w->response.data);
1834                                                         code = mysendfile(w, tok);
1835                                                 }
1836                                                 else {
1837                                                         code = 200;
1838                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
1839                                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1840                                                         buffer_flush(w->response.data);
1841                                                         rrd_stats_graph_json(st, url, w->response.data);
1842                                                 }
1843                                         }
1844                                         else {
1845                                                 code = 400;
1846                                                 buffer_flush(w->response.data);
1847                                                 buffer_strcat(w->response.data, "Graph name?\r\n");
1848                                         }
1849                                 }
1850                                 else if(hash == hash_list && strcmp(tok, "list") == 0) {
1851                                         // OLD API
1852                                         code = 200;
1853
1854                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
1855
1856                                         buffer_flush(w->response.data);
1857                                         RRDSET *st = rrdset_root;
1858
1859                                         for ( ; st ; st = st->next )
1860                                                 buffer_sprintf(w->response.data, "%s\n", st->name);
1861                                 }
1862                                 else if(hash == hash_all_json && strcmp(tok, "all.json") == 0) {
1863                                         // OLD API
1864                                         code = 200;
1865                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
1866
1867                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1868                                         buffer_flush(w->response.data);
1869                                         rrd_stats_all_json(w->response.data);
1870                                 }
1871 #ifdef NETDATA_INTERNAL_CHECKS
1872                                 else if(hash == hash_exit && strcmp(tok, "exit") == 0) {
1873                                         code = 200;
1874                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1875                                         buffer_flush(w->response.data);
1876
1877                                         if(!netdata_exit)
1878                                                 buffer_strcat(w->response.data, "ok, will do...");
1879                                         else
1880                                                 buffer_strcat(w->response.data, "I am doing it already");
1881
1882                                         error("web request to exit received.");
1883                                         netdata_exit = 1;
1884                                 }
1885                                 else if(hash == hash_debug && strcmp(tok, "debug") == 0) {
1886                                         buffer_flush(w->response.data);
1887
1888                                         // get the name of the data to show
1889                                         tok = mystrsep(&url, "/?&");
1890                                         if(tok && *tok) {
1891                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1892
1893                                                 // do we have such a data set?
1894                                                 RRDSET *st = rrdset_find_byname(tok);
1895                                                 if(!st) st = rrdset_find(tok);
1896                                                 if(!st) {
1897                                                         code = 404;
1898                                                         buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
1899                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
1900                                                 }
1901                                                 else {
1902                                                         code = 200;
1903                                                         debug_flags |= D_RRD_STATS;
1904                                                         st->debug = !st->debug;
1905                                                         buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
1906                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
1907                                                 }
1908                                         }
1909                                         else {
1910                                                 code = 500;
1911                                                 buffer_flush(w->response.data);
1912                                                 buffer_strcat(w->response.data, "debug which chart?\r\n");
1913                                         }
1914                                 }
1915                                 else if(hash == hash_mirror && strcmp(tok, "mirror") == 0) {
1916                                         code = 200;
1917
1918                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
1919
1920                                         // replace the zero bytes with spaces
1921                                         buffer_char_replace(w->response.data, '\0', ' ');
1922
1923                                         // just leave the buffer as is
1924                                         // it will be copied back to the client
1925                                 }
1926 #endif  /* NETDATA_INTERNAL_CHECKS */
1927                                 else {
1928                                         char filename[FILENAME_MAX+1];
1929                                         url = filename;
1930                                         strncpyz(filename, w->last_url, FILENAME_MAX);
1931                                         tok = mystrsep(&url, "?");
1932                                         buffer_flush(w->response.data);
1933                                         code = mysendfile(w, (tok && *tok)?tok:"/");
1934                                 }
1935                         }
1936                         else {
1937                                 char filename[FILENAME_MAX+1];
1938                                 url = filename;
1939                                 strncpyz(filename, w->last_url, FILENAME_MAX);
1940                                 tok = mystrsep(&url, "?");
1941                                 buffer_flush(w->response.data);
1942                                 code = mysendfile(w, (tok && *tok)?tok:"/");
1943                         }
1944                 }
1945         }
1946
1947         gettimeofday(&w->tv_ready, NULL);
1948         w->response.data->date = time(NULL);
1949         w->response.sent = 0;
1950         w->response.code = code;
1951
1952         // prepare the HTTP response header
1953         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
1954
1955         const char *content_type_string = web_content_type_to_string(w->response.data->contenttype);
1956         const char *code_msg = web_response_code_to_string(code);
1957
1958         char date[32];
1959         struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
1960         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
1961
1962         buffer_sprintf(w->response.header_output,
1963                 "HTTP/1.1 %d %s\r\n"
1964                 "Connection: %s\r\n"
1965                 "Server: NetData Embedded HTTP Server\r\n"
1966                 "Access-Control-Allow-Origin: %s\r\n"
1967                 "Access-Control-Allow-Credentials: true\r\n"
1968                 "Content-Type: %s\r\n"
1969                 "Date: %s\r\n"
1970                 , code, code_msg
1971                 , w->keepalive?"keep-alive":"close"
1972                 , w->origin
1973                 , content_type_string
1974                 , date
1975                 );
1976
1977         if(w->cookie1[0] || w->cookie2[0]) {
1978                 if(w->cookie1[0]) {
1979                         buffer_sprintf(w->response.header_output,
1980                            "Set-Cookie: %s\r\n",
1981                            w->cookie1);
1982                 }
1983
1984                 if(w->cookie2[0]) {
1985                         buffer_sprintf(w->response.header_output,
1986                            "Set-Cookie: %s\r\n",
1987                            w->cookie2);
1988                 }
1989
1990                 if(web_donotrack_comply)
1991                         buffer_sprintf(w->response.header_output,
1992                            "Tk: T;cookies\r\n");
1993         }
1994         else {
1995                 if(web_donotrack_comply) {
1996                         if(w->tracking_required)
1997                                 buffer_sprintf(w->response.header_output,
1998                                    "Tk: T;cookies\r\n");
1999                         else
2000                                 buffer_sprintf(w->response.header_output,
2001                                    "Tk: N\r\n");
2002                 }
2003         }
2004
2005         if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
2006                 buffer_strcat(w->response.header_output,
2007                         "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
2008                         "Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
2009                         "Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
2010                         );
2011         }
2012
2013         if(buffer_strlen(w->response.header))
2014                 buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
2015
2016         if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
2017                 buffer_sprintf(w->response.header_output,
2018                         "Expires: %s\r\n"
2019                         "Cache-Control: no-cache\r\n"
2020                         , date);
2021         }
2022         else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
2023                 char edate[32];
2024                 time_t et = w->response.data->date + (86400 * 14);
2025                 struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
2026                 strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
2027
2028                 buffer_sprintf(w->response.header_output,
2029                         "Expires: %s\r\n"
2030                         "Cache-Control: public\r\n"
2031                         , edate);
2032         }
2033
2034         // if we know the content length, put it
2035         if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
2036                 buffer_sprintf(w->response.header_output,
2037                         "Content-Length: %ld\r\n"
2038                         , w->response.data->len? w->response.data->len: w->response.rlen
2039                         );
2040         else if(!w->response.zoutput)
2041                 w->keepalive = 0;       // content-length is required for keep-alive
2042
2043         if(w->response.zoutput) {
2044                 buffer_strcat(w->response.header_output,
2045                         "Content-Encoding: gzip\r\n"
2046                         "Transfer-Encoding: chunked\r\n"
2047                         );
2048         }
2049
2050         buffer_strcat(w->response.header_output, "\r\n");
2051
2052         // sent the HTTP header
2053         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
2054                         , w->id
2055                         , buffer_strlen(w->response.header_output)
2056                         , buffer_tostring(w->response.header_output)
2057                         );
2058
2059         web_client_crock_socket(w);
2060
2061         bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
2062         if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
2063                 if(bytes > 0)
2064                         w->stats_sent_bytes += bytes;
2065
2066                 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,
2067                           buffer_strlen(w->response.header_output), bytes);
2068
2069                 WEB_CLIENT_IS_DEAD(w);
2070                 return;
2071         }
2072         else
2073                 w->stats_sent_bytes += bytes;
2074
2075         // enable sending immediately if we have data
2076         if(w->response.data->len) w->wait_send = 1;
2077         else w->wait_send = 0;
2078
2079         // pretty logging
2080         switch(w->mode) {
2081                 case WEB_CLIENT_MODE_OPTIONS:
2082                         debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2083                         break;
2084
2085                 case WEB_CLIENT_MODE_NORMAL:
2086                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2087                         break;
2088
2089                 case WEB_CLIENT_MODE_FILECOPY:
2090                         if(w->response.rlen) {
2091                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
2092                                 w->wait_receive = 1;
2093
2094                                 /*
2095                                 // utilize the kernel sendfile() for copying the file to the socket.
2096                                 // this block of code can be commented, without anything missing.
2097                                 // when it is commented, the program will copy the data using async I/O.
2098                                 {
2099                                         long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
2100                                         if(len != w->response.data->rbytes)
2101                                                 error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
2102                                         else
2103                                                 web_client_reset(w);
2104                                 }
2105                                 */
2106                         }
2107                         else
2108                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
2109                         break;
2110
2111                 default:
2112                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
2113                         break;
2114         }
2115 }
2116
2117 ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
2118 {
2119         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
2120         char buf[24];
2121         sprintf(buf, "%zX\r\n", len);
2122
2123         ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
2124         if(bytes > 0) {
2125                 debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
2126                 w->stats_sent_bytes += bytes;
2127         }
2128
2129         else if(bytes == 0) {
2130                 debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
2131                 WEB_CLIENT_IS_DEAD(w);
2132         }
2133         else {
2134                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk header to client.", w->id);
2135                 WEB_CLIENT_IS_DEAD(w);
2136         }
2137
2138         return bytes;
2139 }
2140
2141 ssize_t web_client_send_chunk_close(struct web_client *w)
2142 {
2143         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
2144
2145         ssize_t bytes = send(w->ofd, "\r\n", 2, 0);
2146         if(bytes > 0) {
2147                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2148                 w->stats_sent_bytes += bytes;
2149         }
2150
2151         else if(bytes == 0) {
2152                 debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
2153                 WEB_CLIENT_IS_DEAD(w);
2154         }
2155         else {
2156                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk suffix to client.", w->id);
2157                 WEB_CLIENT_IS_DEAD(w);
2158         }
2159
2160         return bytes;
2161 }
2162
2163 ssize_t web_client_send_chunk_finalize(struct web_client *w)
2164 {
2165         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
2166
2167         ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
2168         if(bytes > 0) {
2169                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2170                 w->stats_sent_bytes += bytes;
2171         }
2172
2173         else if(bytes == 0) {
2174                 debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
2175                 WEB_CLIENT_IS_DEAD(w);
2176         }
2177         else {
2178                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
2179                 WEB_CLIENT_IS_DEAD(w);
2180         }
2181
2182         return bytes;
2183 }
2184
2185 #ifdef NETDATA_WITH_ZLIB
2186 ssize_t web_client_send_deflate(struct web_client *w)
2187 {
2188         ssize_t len = 0, t = 0;
2189
2190         // when using compression,
2191         // w->response.sent is the amount of bytes passed through compression
2192
2193         debug(D_DEFLATE, "%llu: web_client_send_deflate(): w->response.data->len = %d, w->response.sent = %d, w->response.zhave = %zu, w->response.zsent = %zu, w->response.zstream.avail_in = %d, w->response.zstream.avail_out = %d, w->response.zstream.total_in = %d, w->response.zstream.total_out = %d.",
2194                 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);
2195
2196         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) {
2197                 // there is nothing to send
2198
2199                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2200
2201                 // finalize the chunk
2202                 if(w->response.sent != 0) {
2203                         t = web_client_send_chunk_finalize(w);
2204                         if(t < 0) return t;
2205                 }
2206
2207                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2208                         // we have to wait, more data will come
2209                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2210                         w->wait_send = 0;
2211                         return t;
2212                 }
2213
2214                 if(unlikely(!w->keepalive)) {
2215                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2216                         WEB_CLIENT_IS_DEAD(w);
2217                         return t;
2218                 }
2219
2220                 // reset the client
2221                 web_client_reset(w);
2222                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
2223                 return t;
2224         }
2225
2226         if(w->response.zhave == w->response.zsent) {
2227                 // compress more input data
2228
2229                 // close the previous open chunk
2230                 if(w->response.sent != 0) {
2231                         t = web_client_send_chunk_close(w);
2232                         if(t < 0) return t;
2233                 }
2234
2235                 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);
2236
2237                 // give the compressor all the data not passed through the compressor yet
2238                 if(w->response.data->len > w->response.sent) {
2239                         w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
2240                         w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
2241                 }
2242
2243                 // reset the compressor output buffer
2244                 w->response.zstream.next_out = w->response.zbuffer;
2245                 w->response.zstream.avail_out = ZLIB_CHUNK;
2246
2247                 // ask for FINISH if we have all the input
2248                 int flush = Z_SYNC_FLUSH;
2249                 if(w->mode == WEB_CLIENT_MODE_NORMAL
2250                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
2251                         flush = Z_FINISH;
2252                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
2253                 }
2254                 else {
2255                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
2256                 }
2257
2258                 // compress
2259                 if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
2260                         error("%llu: Compression failed. Closing down client.", w->id);
2261                         web_client_reset(w);
2262                         return(-1);
2263                 }
2264
2265                 w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
2266                 w->response.zsent = 0;
2267
2268                 // keep track of the bytes passed through the compressor
2269                 w->response.sent = w->response.data->len;
2270
2271                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
2272
2273                 // open a new chunk
2274                 ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
2275                 if(t2 < 0) return t2;
2276                 t += t2;
2277         }
2278
2279         debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
2280
2281         len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
2282         if(len > 0) {
2283                 w->stats_sent_bytes += len;
2284                 w->response.zsent += len;
2285                 len += t;
2286                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
2287         }
2288         else if(len == 0) {
2289                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client (zhave = %zu, zsent = %zu, need to send = %zu).",
2290                         w->id, w->response.zhave, w->response.zsent, w->response.zhave - w->response.zsent);
2291
2292                 WEB_CLIENT_IS_DEAD(w);
2293         }
2294         else {
2295                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2296                 WEB_CLIENT_IS_DEAD(w);
2297         }
2298
2299         return(len);
2300 }
2301 #endif // NETDATA_WITH_ZLIB
2302
2303 ssize_t web_client_send(struct web_client *w) {
2304 #ifdef NETDATA_WITH_ZLIB
2305         if(likely(w->response.zoutput)) return web_client_send_deflate(w);
2306 #endif // NETDATA_WITH_ZLIB
2307
2308         ssize_t bytes;
2309
2310         if(unlikely(w->response.data->len - w->response.sent == 0)) {
2311                 // there is nothing to send
2312
2313                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2314
2315                 // there can be two cases for this
2316                 // A. we have done everything
2317                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
2318
2319                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2320                         // we have to wait, more data will come
2321                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2322                         w->wait_send = 0;
2323                         return 0;
2324                 }
2325
2326                 if(unlikely(!w->keepalive)) {
2327                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2328                         WEB_CLIENT_IS_DEAD(w);
2329                         return 0;
2330                 }
2331
2332                 web_client_reset(w);
2333                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
2334                 return 0;
2335         }
2336
2337         bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
2338         if(likely(bytes > 0)) {
2339                 w->stats_sent_bytes += bytes;
2340                 w->response.sent += bytes;
2341                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
2342         }
2343         else if(likely(bytes == 0)) {
2344                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
2345                 WEB_CLIENT_IS_DEAD(w);
2346         }
2347         else {
2348                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2349                 WEB_CLIENT_IS_DEAD(w);
2350         }
2351
2352         return(bytes);
2353 }
2354
2355 ssize_t web_client_receive(struct web_client *w)
2356 {
2357         // do we have any space for more data?
2358         buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
2359
2360         ssize_t left = w->response.data->size - w->response.data->len;
2361         ssize_t bytes;
2362
2363         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
2364                 bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
2365         else
2366                 bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
2367
2368         if(likely(bytes > 0)) {
2369                 if(w->mode != WEB_CLIENT_MODE_FILECOPY)
2370                         w->stats_received_bytes += bytes;
2371
2372                 size_t old = w->response.data->len;
2373                 w->response.data->len += bytes;
2374                 w->response.data->buffer[w->response.data->len] = '\0';
2375
2376                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
2377                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
2378
2379                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2380                         w->wait_send = 1;
2381
2382                         if(w->response.rlen && w->response.data->len >= w->response.rlen)
2383                                 w->wait_receive = 0;
2384                 }
2385         }
2386         else if(likely(bytes == 0)) {
2387                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
2388
2389                 // if we cannot read, it means we have an error on input.
2390                 // if however, we are copying a file from ifd to ofd, we should not return an error.
2391                 // in this case, the error should be generated when the file has been sent to the client.
2392
2393                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2394                         // we are copying data from ifd to ofd
2395                         // let it finish copying...
2396                         w->wait_receive = 0;
2397
2398                         debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
2399                         if(w->ifd != w->ofd) close(w->ifd);
2400                         w->ifd = w->ofd;
2401                 }
2402                 else {
2403                         debug(D_WEB_CLIENT, "%llu: failed to receive data.", w->id);
2404                         WEB_CLIENT_IS_DEAD(w);
2405                 }
2406         }
2407         else {
2408                 debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
2409                 WEB_CLIENT_IS_DEAD(w);
2410         }
2411
2412         return(bytes);
2413 }
2414
2415
2416 // --------------------------------------------------------------------------------------
2417 // the thread of a single client
2418
2419 // 1. waits for input and output, using async I/O
2420 // 2. it processes HTTP requests
2421 // 3. it generates HTTP responses
2422 // 4. it copies data from input to output if mode is FILECOPY
2423
2424 void *web_client_main(void *ptr)
2425 {
2426         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
2427                 error("Cannot set pthread cancel type to DEFERRED.");
2428
2429         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
2430                 error("Cannot set pthread cancel state to ENABLE.");
2431
2432         struct web_client *w = ptr;
2433         struct pollfd fds[2], *ifd, *ofd;
2434         int retval, fdmax = 0, timeout;
2435
2436         log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2437
2438         for(;;) {
2439                 if(unlikely(w->dead)) {
2440                         debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
2441                         break;
2442                 }
2443                 else if(unlikely(!w->wait_receive && !w->wait_send)) {
2444                         debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.");
2445                         break;
2446                 }
2447
2448                 if(unlikely(w->ifd < 0 || w->ofd < 0)) {
2449                         error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
2450                         break;
2451                 }
2452
2453                 if(w->ifd == w->ofd) {
2454                         fds[0].fd = w->ifd;
2455                         fds[0].events = 0;
2456                         fds[0].revents = 0;
2457
2458                         if(w->wait_receive) fds[0].events |= POLLIN;
2459                         if(w->wait_send)    fds[0].events |= POLLOUT;
2460
2461                         fds[1].fd = -1;
2462                         fds[1].events = 0;
2463                         fds[1].revents = 0;
2464
2465                         ifd = ofd = &fds[0];
2466
2467                         fdmax = 1;
2468                 }
2469                 else {
2470                         fds[0].fd = w->ifd;
2471                         fds[0].events = 0;
2472                         fds[0].revents = 0;
2473                         if(w->wait_receive) fds[0].events |= POLLIN;
2474                         ifd = &fds[0];
2475
2476                         fds[1].fd = w->ofd;
2477                         fds[1].events = 0;
2478                         fds[1].revents = 0;
2479                         if(w->wait_send)    fds[1].events |= POLLOUT;
2480                         ofd = &fds[1];
2481
2482                         fdmax = 2;
2483                 }
2484
2485                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2486                 errno = 0;
2487                 timeout = web_client_timeout * 1000;
2488                 retval = poll(fds, fdmax, timeout);
2489
2490                 if(unlikely(retval == -1)) {
2491                         if(errno == EAGAIN || errno == EINTR) {
2492                                 debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
2493                                 continue;
2494                         }
2495
2496                         debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
2497                         break;
2498                 }
2499                 else if(unlikely(!retval)) {
2500                         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":"");
2501                         break;
2502                 }
2503
2504                 int used = 0;
2505                 if(w->wait_send && ofd->revents & POLLOUT) {
2506                         used++;
2507                         if(web_client_send(w) < 0) {
2508                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
2509                                 break;
2510                         }
2511                 }
2512
2513                 if(w->wait_receive && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
2514                         used++;
2515                         if(web_client_receive(w) < 0) {
2516                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
2517                                 break;
2518                         }
2519
2520                         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
2521                                 debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
2522                                 web_client_process(w);
2523                         }
2524                 }
2525
2526                 if(unlikely(!used)) {
2527                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
2528                         break;
2529                 }
2530         }
2531
2532         web_client_reset(w);
2533
2534         log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2535         debug(D_WEB_CLIENT, "%llu: done...", w->id);
2536
2537         // close the sockets/files now
2538         // to free file descriptors
2539         if(w->ifd == w->ofd) {
2540                 if(w->ifd != -1) close(w->ifd);
2541         }
2542         else {
2543                 if(w->ifd != -1) close(w->ifd);
2544                 if(w->ofd != -1) close(w->ofd);
2545         }
2546         w->ifd = -1;
2547         w->ofd = -1;
2548
2549         w->obsolete = 1;
2550
2551         pthread_exit(NULL);
2552         return NULL;
2553 }