src/web_client.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <unistd.h>
   5 #include <stdlib.h>
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <netinet/in.h>
   9 #include <arpa/inet.h>
  10 #include <errno.h>
  11 #include <pthread.h>
  12 #include <sys/stat.h>
  13 #include <fcntl.h>
  14 #include <malloc.h>
  15 #include <pwd.h>
  16 #include <grp.h>
  17 #include <ctype.h>
  18 #include <poll.h>
  19
  20 // TCP_CORK
  21 #include <netinet/tcp.h>
  22
  23 #include "common.h"
  24 #include "log.h"
  25 #include "appconfig.h"
  26 #include "url.h"
  27 #include "web_buffer.h"
  28 #include "web_server.h"
  29 #include "global_statistics.h"
  30 #include "rrd.h"
  31 #include "rrd2json.h"
  32 #include "registry.h"
  33 #include "web_buffer_svg.h"
  34 #include "web_client.h"
  35
  36 #define INITIAL_WEB_DATA_LENGTH 16384
  37 #define WEB_REQUEST_LENGTH 16384
  38 #define TOO_BIG_REQUEST 16384
  39
  40 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
  41 int web_donotrack_comply = 0;
  42
  43 #ifdef NETDATA_WITH_ZLIB
  44 int web_enable_gzip = 1, web_gzip_level = 3, web_gzip_strategy = Z_DEFAULT_STRATEGY;
  45 #endif /* NETDATA_WITH_ZLIB */
  46
  47 extern int netdata_exit;
  48
  49 struct web_client *web_clients = NULL;
  50 unsigned long long web_clients_count = 0;
  51
  52 inline int web_client_crock_socket(struct web_client *w) {
  53 #ifdef TCP_CORK
  54         if(likely(!w->tcp_cork && w->ofd != -1)) {
  55                 w->tcp_cork = 1;
  56                 if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
  57                         error("%llu: failed to enable TCP_CORK on socket.", w->id);
  58                         w->tcp_cork = 0;
  59                         return -1;
  60                 }
  61         }
  62 #endif /* TCP_CORK */
  63
  64         return 0;
  65 }
  66
  67 inline int web_client_uncrock_socket(struct web_client *w) {
  68 #ifdef TCP_CORK
  69         if(likely(w->tcp_cork && w->ofd != -1)) {
  70                 w->tcp_cork = 0;
  71                 if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
  72                         error("%llu: failed to disable TCP_CORK on socket.", w->id);
  73                         w->tcp_cork = 1;
  74                         return -1;
  75                 }
  76         }
  77 #endif /* TCP_CORK */
  78
  79         return 0;
  80 }
  81
  82 struct web_client *web_client_create(int listener)
  83 {
  84         struct web_client *w;
  85
  86         w = calloc(1, sizeof(struct web_client));
  87         if(!w) {
  88                 error("Cannot allocate new web_client memory.");
  89                 return NULL;
  90         }
  91
  92         w->id = ++web_clients_count;
  93         w->mode = WEB_CLIENT_MODE_NORMAL;
  94
  95         {
  96                 struct sockaddr *sadr;
  97                 socklen_t addrlen;
  98
  99                 sadr = (struct sockaddr*) &w->clientaddr;
 100                 addrlen = sizeof(w->clientaddr);
 101
 102                 w->ifd = accept(listener, sadr, &addrlen);
 103                 if (w->ifd == -1) {
 104                         error("%llu: Cannot accept new incoming connection.", w->id);
 105                         free(w);
 106                         return NULL;
 107                 }
 108                 w->ofd = w->ifd;
 109
 110                 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
 111                         error("Cannot getnameinfo() on received client connection.");
 112                         strncpyz(w->client_ip,   "UNKNOWN", NI_MAXHOST);
 113                         strncpyz(w->client_port, "UNKNOWN", NI_MAXSERV);
 114                 }
 115                 w->client_ip[NI_MAXHOST]   = '\0';
 116                 w->client_port[NI_MAXSERV] = '\0';
 117
 118                 switch(sadr->sa_family) {
 119                 case AF_INET:
 120                         debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 121                         break;
 122
 123                 case AF_INET6:
 124                         if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
 125                                 strcpy(w->client_ip, &w->client_ip[7]);
 126                                 debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv4 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 127                         }
 128                         else
 129                                 debug(D_WEB_CLIENT_ACCESS, "%llu: New IPv6 web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 130                         break;
 131
 132                 default:
 133                         debug(D_WEB_CLIENT_ACCESS, "%llu: New UNKNOWN web client from %s port %s on socket %d.", w->id, w->client_ip, w->client_port, w->ifd);
 134                         break;
 135                 }
 136
 137                 int flag = 1;
 138                 if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
 139                         error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
 140
 141                 flag = 1;
 142                 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0)
 143                         error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
 144
 145
 146         }
 147
 148         w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
 149         if(unlikely(!w->response.data)) {
 150                 // no need for error log - web_buffer_create already logged the error
 151                 close(w->ifd);
 152                 free(w);
 153                 return NULL;
 154         }
 155
 156         w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 157         if(unlikely(!w->response.header)) {
 158                 // no need for error log - web_buffer_create already logged the error
 159                 buffer_free(w->response.data);
 160                 close(w->ifd);
 161                 free(w);
 162                 return NULL;
 163         }
 164
 165         w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 166         if(unlikely(!w->response.header_output)) {
 167                 // no need for error log - web_buffer_create already logged the error
 168                 buffer_free(w->response.header);
 169                 buffer_free(w->response.data);
 170                 close(w->ifd);
 171                 free(w);
 172                 return NULL;
 173         }
 174
 175         w->origin[0] = '*';
 176         w->wait_receive = 1;
 177
 178         if(web_clients) web_clients->prev = w;
 179         w->next = web_clients;
 180         web_clients = w;
 181
 182         global_statistics.connected_clients++;
 183
 184         return(w);
 185 }
 186
 187 void web_client_reset(struct web_client *w) {
 188         web_client_uncrock_socket(w);
 189
 190         debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 191
 192         if(likely(w->last_url[0])) {
 193                 struct timeval tv;
 194                 gettimeofday(&tv, NULL);
 195
 196                 size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 197                 size_t sent = size;
 198 #ifdef NETDATA_WITH_ZLIB
 199                 if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
 200 #endif
 201
 202                 // --------------------------------------------------------------------
 203                 // global statistics
 204
 205                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 206                         global_statistics_lock();
 207
 208                 global_statistics.web_requests++;
 209                 global_statistics.web_usec += usecdiff(&tv, &w->tv_in);
 210                 global_statistics.bytes_received += w->stats_received_bytes;
 211                 global_statistics.bytes_sent += w->stats_sent_bytes;
 212                 global_statistics.content_size += size;
 213                 global_statistics.compressed_content_size += sent;
 214
 215                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 216                         global_statistics_unlock();
 217
 218                 w->stats_received_bytes = 0;
 219                 w->stats_sent_bytes = 0;
 220
 221
 222                 // --------------------------------------------------------------------
 223                 // access log
 224
 225                 log_access("%llu: (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
 226                                    w->id,
 227                                    sent, size, -((size > 0) ? ((float) (size - sent) / (float) size * 100.0) : 0.0),
 228                                    (float) usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
 229                                    (float) usecdiff(&tv, &w->tv_ready) / 1000.0,
 230                                    (float) usecdiff(&tv, &w->tv_in) / 1000.0,
 231                                    (w->mode == WEB_CLIENT_MODE_FILECOPY) ? "filecopy" : ((w->mode == WEB_CLIENT_MODE_OPTIONS)
 232                                                                                                                                                  ? "options" : "data"),
 233                                    w->response.code,
 234                                    w->last_url
 235                 );
 236         }
 237
 238         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
 239                 if(w->ifd != w->ofd) {
 240                         debug(D_WEB_CLIENT, "%llu: Closing filecopy input file descriptor %d.", w->id, w->ifd);
 241                         if(w->ifd != -1) close(w->ifd);
 242                         w->ifd = w->ofd;
 243                 }
 244         }
 245
 246         w->last_url[0] = '\0';
 247         w->cookie1[0] = '\0';
 248         w->cookie2[0] = '\0';
 249         w->origin[0] = '*';
 250         w->origin[1] = '\0';
 251
 252         w->mode = WEB_CLIENT_MODE_NORMAL;
 253
 254         w->tcp_cork = 0;
 255         w->donottrack = 0;
 256         w->tracking_required = 0;
 257         w->keepalive = 0;
 258         w->decoded_url[0] = '\0';
 259
 260         buffer_reset(w->response.header_output);
 261         buffer_reset(w->response.header);
 262         buffer_reset(w->response.data);
 263         w->response.rlen = 0;
 264         w->response.sent = 0;
 265         w->response.code = 0;
 266
 267         w->wait_receive = 1;
 268         w->wait_send = 0;
 269
 270         w->response.zoutput = 0;
 271
 272         // if we had enabled compression, release it
 273 #ifdef NETDATA_WITH_ZLIB
 274         if(w->response.zinitialized) {
 275                 debug(D_DEFLATE, "%llu: Freeing compression resources.", w->id);
 276                 deflateEnd(&w->response.zstream);
 277                 w->response.zsent = 0;
 278                 w->response.zhave = 0;
 279                 w->response.zstream.avail_in = 0;
 280                 w->response.zstream.avail_out = 0;
 281                 w->response.zstream.total_in = 0;
 282                 w->response.zstream.total_out = 0;
 283                 w->response.zinitialized = 0;
 284         }
 285 #endif // NETDATA_WITH_ZLIB
 286 }
 287
 288 struct web_client *web_client_free(struct web_client *w) {
 289         web_client_reset(w);
 290
 291         struct web_client *n = w->next;
 292         if(w == web_clients) web_clients = n;
 293
 294         debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 295
 296         if(w->prev)     w->prev->next = w->next;
 297         if(w->next) w->next->prev = w->prev;
 298         if(w->response.header_output) buffer_free(w->response.header_output);
 299         if(w->response.header) buffer_free(w->response.header);
 300         if(w->response.data) buffer_free(w->response.data);
 301         if(w->ifd != -1) close(w->ifd);
 302         if(w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
 303         free(w);
 304
 305         global_statistics.connected_clients--;
 306
 307         return(n);
 308 }
 309
 310 uid_t web_files_uid(void) {
 311         static char *web_owner = NULL;
 312         static uid_t owner_uid = 0;
 313
 314         if(unlikely(!web_owner)) {
 315                 web_owner = config_get("global", "web files owner", config_get("global", "run as user", ""));
 316                 if(!web_owner || !*web_owner)
 317                         owner_uid = geteuid();
 318                 else {
 319                         // getpwnam() is not thread safe,
 320                         // but we have called this function once
 321                         // while single threaded
 322                         struct passwd *pw = getpwnam(web_owner);
 323                         if(!pw) {
 324                                 error("User '%s' is not present. Ignoring option.", web_owner);
 325                                 owner_uid = geteuid();
 326                         }
 327                         else {
 328                                 debug(D_WEB_CLIENT, "Web files owner set to %s.", web_owner);
 329                                 owner_uid = pw->pw_uid;
 330                         }
 331                 }
 332         }
 333
 334         return(owner_uid);
 335 }
 336
 337 gid_t web_files_gid(void) {
 338         static char *web_group = NULL;
 339         static gid_t owner_gid = 0;
 340
 341         if(unlikely(!web_group)) {
 342                 web_group = config_get("global", "web files group", config_get("global", "web files owner", ""));
 343                 if(!web_group || !*web_group)
 344                         owner_gid = getegid();
 345                 else {
 346                         // getgrnam() is not thread safe,
 347                         // but we have called this function once
 348                         // while single threaded
 349                         struct group *gr = getgrnam(web_group);
 350                         if(!gr) {
 351                                 error("Group '%s' is not present. Ignoring option.", web_group);
 352                                 owner_gid = getegid();
 353                         }
 354                         else {
 355                                 debug(D_WEB_CLIENT, "Web files group set to %s.", web_group);
 356                                 owner_gid = gr->gr_gid;
 357                         }
 358                 }
 359         }
 360
 361         return(owner_gid);
 362 }
 363
 364 int mysendfile(struct web_client *w, char *filename)
 365 {
 366         static char *web_dir = NULL;
 367
 368         // initialize our static data
 369         if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
 370
 371         debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
 372
 373         // skip leading slashes
 374         while (*filename == '/') filename++;
 375
 376         // if the filename contain known paths, skip them
 377         if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE) + 1];
 378
 379         char *s;
 380         for(s = filename; *s ;s++) {
 381                 if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
 382                         debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 383                         buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
 384                         return 400;
 385                 }
 386         }
 387
 388         // if the filename contains a .. refuse to serve it
 389         if(strstr(filename, "..") != 0) {
 390                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 391                 buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
 392                 return 400;
 393         }
 394
 395         // access the file
 396         char webfilename[FILENAME_MAX + 1];
 397         snprintfz(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
 398
 399         // check if the file exists
 400         struct stat stat;
 401         if(lstat(webfilename, &stat) != 0) {
 402                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
 403                 buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
 404                 return 404;
 405         }
 406
 407         // check if the file is owned by expected user
 408         if(stat.st_uid != web_files_uid()) {
 409                 error("%llu: File '%s' is owned by user %d (expected user %d). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
 410                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 411                 return 403;
 412         }
 413
 414         // check if the file is owned by expected group
 415         if(stat.st_gid != web_files_gid()) {
 416                 error("%llu: File '%s' is owned by group %d (expected group %d). Access Denied.", w->id, webfilename, stat.st_gid, web_files_gid());
 417                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 418                 return 403;
 419         }
 420
 421         if((stat.st_mode & S_IFMT) == S_IFDIR) {
 422                 snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
 423                 return mysendfile(w, webfilename);
 424         }
 425
 426         if((stat.st_mode & S_IFMT) != S_IFREG) {
 427                 error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
 428                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 429                 return 403;
 430         }
 431
 432         // open the file
 433         w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
 434         if(w->ifd == -1) {
 435                 w->ifd = w->ofd;
 436
 437                 if(errno == EBUSY || errno == EAGAIN) {
 438                         error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
 439                         buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
 440                         buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
 441                         return 307;
 442                 }
 443                 else {
 444                         error("%llu: Cannot open file '%s'.", w->id, webfilename);
 445                         buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
 446                         return 404;
 447                 }
 448         }
 449
 450         // pick a Content-Type for the file
 451                  if(strstr(filename, ".html") != NULL)  w->response.data->contenttype = CT_TEXT_HTML;
 452         else if(strstr(filename, ".js")   != NULL)      w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 453         else if(strstr(filename, ".css")  != NULL)      w->response.data->contenttype = CT_TEXT_CSS;
 454         else if(strstr(filename, ".xml")  != NULL)      w->response.data->contenttype = CT_TEXT_XML;
 455         else if(strstr(filename, ".xsl")  != NULL)      w->response.data->contenttype = CT_TEXT_XSL;
 456         else if(strstr(filename, ".txt")  != NULL)  w->response.data->contenttype = CT_TEXT_PLAIN;
 457         else if(strstr(filename, ".svg")  != NULL)  w->response.data->contenttype = CT_IMAGE_SVG_XML;
 458         else if(strstr(filename, ".ttf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
 459         else if(strstr(filename, ".otf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
 460         else if(strstr(filename, ".woff2")!= NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF2;
 461         else if(strstr(filename, ".woff") != NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF;
 462         else if(strstr(filename, ".eot")  != NULL)  w->response.data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
 463         else if(strstr(filename, ".png")  != NULL)  w->response.data->contenttype = CT_IMAGE_PNG;
 464         else if(strstr(filename, ".jpg")  != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 465         else if(strstr(filename, ".jpeg") != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 466         else if(strstr(filename, ".gif")  != NULL)  w->response.data->contenttype = CT_IMAGE_GIF;
 467         else if(strstr(filename, ".bmp")  != NULL)  w->response.data->contenttype = CT_IMAGE_BMP;
 468         else if(strstr(filename, ".ico")  != NULL)  w->response.data->contenttype = CT_IMAGE_XICON;
 469         else if(strstr(filename, ".icns") != NULL)  w->response.data->contenttype = CT_IMAGE_ICNS;
 470         else w->response.data->contenttype = CT_APPLICATION_OCTET_STREAM;
 471
 472         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending file '%s' (%ld bytes, ifd %d, ofd %d).", w->id, webfilename, stat.st_size, w->ifd, w->ofd);
 473
 474         w->mode = WEB_CLIENT_MODE_FILECOPY;
 475         w->wait_receive = 1;
 476         w->wait_send = 0;
 477         buffer_flush(w->response.data);
 478         w->response.rlen = stat.st_size;
 479         w->response.data->date = stat.st_mtim.tv_sec;
 480
 481         return 200;
 482 }
 483
 484
 485 #ifdef NETDATA_WITH_ZLIB
 486 void web_client_enable_deflate(struct web_client *w, int gzip) {
 487         if(unlikely(w->response.zinitialized)) {
 488                 error("%llu: Compression has already be initialized for this client.", w->id);
 489                 return;
 490         }
 491
 492         if(unlikely(w->response.sent)) {
 493                 error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
 494                 return;
 495         }
 496
 497         w->response.zstream.zalloc = Z_NULL;
 498         w->response.zstream.zfree = Z_NULL;
 499         w->response.zstream.opaque = Z_NULL;
 500
 501         w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
 502         w->response.zstream.avail_in = 0;
 503         w->response.zstream.total_in = 0;
 504
 505         w->response.zstream.next_out = w->response.zbuffer;
 506         w->response.zstream.avail_out = 0;
 507         w->response.zstream.total_out = 0;
 508
 509         w->response.zstream.zalloc = Z_NULL;
 510         w->response.zstream.zfree = Z_NULL;
 511         w->response.zstream.opaque = Z_NULL;
 512
 513 //      if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 514 //              error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 515 //              return;
 516 //      }
 517
 518         // Select GZIP compression: windowbits = 15 + 16 = 31
 519         if(deflateInit2(&w->response.zstream, web_gzip_level, Z_DEFLATED, 15 + ((gzip)?16:0), 8, web_gzip_strategy) != Z_OK) {
 520                 error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 521                 return;
 522         }
 523
 524         w->response.zsent = 0;
 525         w->response.zoutput = 1;
 526         w->response.zinitialized = 1;
 527
 528         debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
 529 }
 530 #endif // NETDATA_WITH_ZLIB
 531
 532 uint32_t web_client_api_request_v1_data_options(char *o)
 533 {
 534         uint32_t ret = 0x00000000;
 535         char *tok;
 536
 537         while(o && *o && (tok = mystrsep(&o, ", |"))) {
 538                 if(!*tok) continue;
 539
 540                 if(!strcmp(tok, "nonzero"))
 541                         ret |= RRDR_OPTION_NONZERO;
 542                 else if(!strcmp(tok, "flip") || !strcmp(tok, "reversed") || !strcmp(tok, "reverse"))
 543                         ret |= RRDR_OPTION_REVERSED;
 544                 else if(!strcmp(tok, "jsonwrap"))
 545                         ret |= RRDR_OPTION_JSON_WRAP;
 546                 else if(!strcmp(tok, "min2max"))
 547                         ret |= RRDR_OPTION_MIN2MAX;
 548                 else if(!strcmp(tok, "ms") || !strcmp(tok, "milliseconds"))
 549                         ret |= RRDR_OPTION_MILLISECONDS;
 550                 else if(!strcmp(tok, "abs") || !strcmp(tok, "absolute") || !strcmp(tok, "absolute_sum") || !strcmp(tok, "absolute-sum"))
 551                         ret |= RRDR_OPTION_ABSOLUTE;
 552                 else if(!strcmp(tok, "seconds"))
 553                         ret |= RRDR_OPTION_SECONDS;
 554                 else if(!strcmp(tok, "null2zero"))
 555                         ret |= RRDR_OPTION_NULL2ZERO;
 556                 else if(!strcmp(tok, "objectrows"))
 557                         ret |= RRDR_OPTION_OBJECTSROWS;
 558                 else if(!strcmp(tok, "google_json"))
 559                         ret |= RRDR_OPTION_GOOGLE_JSON;
 560                 else if(!strcmp(tok, "percentage"))
 561                         ret |= RRDR_OPTION_PERCENTAGE;
 562                 else if(!strcmp(tok, "unaligned"))
 563                         ret |= RRDR_OPTION_NOT_ALIGNED;
 564         }
 565
 566         return ret;
 567 }
 568
 569 uint32_t web_client_api_request_v1_data_format(char *name)
 570 {
 571         if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
 572                 return DATASOURCE_DATATABLE_JSON;
 573
 574         else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
 575                 return DATASOURCE_DATATABLE_JSONP;
 576
 577         else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
 578                 return DATASOURCE_JSON;
 579
 580         else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
 581                 return DATASOURCE_JSONP;
 582
 583         else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
 584                 return DATASOURCE_SSV;
 585
 586         else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
 587                 return DATASOURCE_CSV;
 588
 589         else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
 590                 return DATASOURCE_TSV;
 591
 592         else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
 593                 return DATASOURCE_HTML;
 594
 595         else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
 596                 return DATASOURCE_JS_ARRAY;
 597
 598         else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
 599                 return DATASOURCE_SSV_COMMA;
 600
 601         else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
 602                 return DATASOURCE_CSV_JSON_ARRAY;
 603
 604         return DATASOURCE_JSON;
 605 }
 606
 607 uint32_t web_client_api_request_v1_data_google_format(char *name)
 608 {
 609         if(!strcmp(name, "json"))
 610                 return DATASOURCE_DATATABLE_JSONP;
 611
 612         else if(!strcmp(name, "html"))
 613                 return DATASOURCE_HTML;
 614
 615         else if(!strcmp(name, "csv"))
 616                 return DATASOURCE_CSV;
 617
 618         else if(!strcmp(name, "tsv-excel"))
 619                 return DATASOURCE_TSV;
 620
 621         return DATASOURCE_JSON;
 622 }
 623
 624 int web_client_api_request_v1_data_group(char *name)
 625 {
 626         if(!strcmp(name, "max"))
 627                 return GROUP_MAX;
 628
 629         else if(!strcmp(name, "average"))
 630                 return GROUP_AVERAGE;
 631
 632         else if(!strcmp(name, "sum"))
 633                 return GROUP_SUM;
 634
 635         else if(!strcmp(name, "incremental-sum"))
 636                 return GROUP_INCREMENTAL_SUM;
 637
 638         return GROUP_AVERAGE;
 639 }
 640
 641 int web_client_api_request_v1_charts(struct web_client *w, char *url)
 642 {
 643         if(url) { ; }
 644
 645         buffer_flush(w->response.data);
 646         w->response.data->contenttype = CT_APPLICATION_JSON;
 647         rrd_stats_api_v1_charts(w->response.data);
 648         return 200;
 649 }
 650
 651 int web_client_api_request_v1_chart(struct web_client *w, char *url)
 652 {
 653         int ret = 400;
 654         char *chart = NULL;
 655
 656         buffer_flush(w->response.data);
 657
 658         while(url) {
 659                 char *value = mystrsep(&url, "?&[]");
 660                 if(!value || !*value) continue;
 661
 662                 char *name = mystrsep(&value, "=");
 663                 if(!name || !*name) continue;
 664                 if(!value || !*value) continue;
 665
 666                 // name and value are now the parameters
 667                 // they are not null and not empty
 668
 669                 if(!strcmp(name, "chart")) chart = value;
 670                 //else {
 671                 ///     buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
 672                 //      goto cleanup;
 673                 //}
 674         }
 675
 676         if(!chart || !*chart) {
 677                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 678                 goto cleanup;
 679         }
 680
 681         RRDSET *st = rrdset_find(chart);
 682         if(!st) st = rrdset_find_byname(chart);
 683         if(!st) {
 684                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 685                 ret = 404;
 686                 goto cleanup;
 687         }
 688
 689         w->response.data->contenttype = CT_APPLICATION_JSON;
 690         rrd_stats_api_v1_chart(st, w->response.data);
 691         return 200;
 692
 693 cleanup:
 694         return ret;
 695 }
 696
 697 int web_client_api_v1_badge(struct web_client *w, char *url) {
 698         // chart
 699         // dimensions
 700         // before
 701         // after
 702         // points
 703
 704         int ret = 400;
 705         buffer_flush(w->response.data);
 706
 707         BUFFER *dimensions = NULL;
 708
 709         const char *chart = NULL
 710                         , *before_str = NULL
 711                         , *after_str = NULL
 712                         , *points_str = NULL
 713                         , *multiply_str = NULL
 714                         , *divide_str = NULL
 715                         , *label = NULL
 716                         , *units = NULL
 717                         , *label_color = NULL
 718                         , *value_color = NULL
 719                         , *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) dimensions = buffer_create(strlen(value));
 741                         if(dimensions) {
 742                                 buffer_strcat(dimensions, "|");
 743                                 buffer_strcat(dimensions, value);
 744                         }
 745                 }
 746                 else if(!strcmp(name, "after")) after_str = value;
 747                 else if(!strcmp(name, "before")) before_str = value;
 748                 else if(!strcmp(name, "points")) points_str = value;
 749                 else if(!strcmp(name, "group")) {
 750                         group = web_client_api_request_v1_data_group(value);
 751                 }
 752                 else if(!strcmp(name, "options")) {
 753                         options |= web_client_api_request_v1_data_options(value);
 754                 }
 755                 else if(!strcmp(name, "label")) label = value;
 756                 else if(!strcmp(name, "units")) units = value;
 757                 else if(!strcmp(name, "label_color")) label_color = value;
 758                 else if(!strcmp(name, "value_color")) value_color = value;
 759                 else if(!strcmp(name, "multiply")) multiply_str = value;
 760                 else if(!strcmp(name, "divide")) divide_str = value;
 761                 else if(!strcmp(name, "refresh")) refresh_str = value;
 762                 else if(!strcmp(name, "precision")) precision_str = value;
 763         }
 764
 765         if(!chart || !*chart) {
 766                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 767                 goto cleanup;
 768         }
 769
 770         RRDSET *st = rrdset_find(chart);
 771         if(!st) st = rrdset_find_byname(chart);
 772         if(!st) {
 773                 buffer_svg(w->response.data, "chart not found", 0, "", NULL, NULL, 1, -1);
 774                 ret = 200;
 775                 goto cleanup;
 776         }
 777
 778         long long multiply  = (multiply_str  && *multiply_str )?atol(multiply_str):1;
 779         long long divide    = (divide_str    && *divide_str   )?atol(divide_str):1;
 780         long long before    = (before_str    && *before_str   )?atol(before_str):0;
 781         long long after     = (after_str     && *after_str    )?atol(after_str):-st->update_every;
 782         int       points    = (points_str    && *points_str   )?atoi(points_str):1;
 783         int       precision = (precision_str && *precision_str)?atoi(precision_str):-1;
 784
 785         int refresh = 0;
 786         if(refresh_str && *refresh_str) {
 787                 if(!strcmp(refresh_str, "auto")) {
 788                         if(options & RRDR_OPTION_NOT_ALIGNED)
 789                                 refresh = st->update_every;
 790                         else {
 791                                 refresh = (before - after);
 792                                 if(refresh < 0) refresh = -refresh;
 793                         }
 794                 }
 795                 else {
 796                         refresh = atoi(refresh_str);
 797                         if(refresh < 0) refresh = -refresh;
 798                 }
 799         }
 800
 801         if(!label) {
 802                 if(dimensions) {
 803                         const char *dim = buffer_tostring(dimensions);
 804                         if(*dim == '|') dim++;
 805                         label = dim;
 806                 }
 807                 else
 808                         label = st->name;
 809         }
 810         if(!units) {
 811                 if(options & RRDR_OPTION_PERCENTAGE)
 812                         units="%";
 813                 else
 814                         units = st->units;
 815         }
 816
 817         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'"
 818                         , w->id
 819                         , chart
 820                         , (dimensions)?buffer_tostring(dimensions):""
 821                         , after
 822                         , before
 823                         , points
 824                         , group
 825                         , options
 826                         );
 827
 828         time_t latest_timestamp = 0;
 829         int value_is_null = 1;
 830         calculated_number n = 0;
 831         ret = 500;
 832
 833         // if the collected value is too old, don't calculate its value
 834         if(rrdset_last_entry_t(st) >= (time(NULL) - (st->update_every * st->gap_when_lost_iterations_above)))
 835                 ret = rrd2value(st, w->response.data, &n, dimensions, points, after, before, group, options, &latest_timestamp, &value_is_null);
 836
 837         // if the value cannot be calculated, show empty badge
 838         if(ret != 200) {
 839                 value_is_null = 1;
 840                 n = 0;
 841                 ret = 200;
 842         }
 843         else if(refresh > 0)
 844                 buffer_sprintf(w->response.header, "Refresh: %d\r\n", refresh);
 845
 846         // render the badge
 847         buffer_svg(w->response.data, label, n * multiply / divide, units, label_color, value_color, value_is_null, precision);
 848         return ret;
 849
 850 cleanup:
 851         if(dimensions) buffer_free(dimensions);
 852         return ret;
 853 }
 854
 855 // returns the HTTP code
 856 int web_client_api_request_v1_data(struct web_client *w, char *url)
 857 {
 858         debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
 859
 860         int ret = 400;
 861         BUFFER *dimensions = NULL;
 862
 863         buffer_flush(w->response.data);
 864
 865         char    *google_version = "0.6",
 866                         *google_reqId = "0",
 867                         *google_sig = "0",
 868                         *google_out = "json",
 869                         *responseHandler = NULL,
 870                         *outFileName = NULL;
 871
 872         time_t last_timestamp_in_data = 0, google_timestamp = 0;
 873
 874         char *chart = NULL
 875                         , *before_str = NULL
 876                         , *after_str = NULL
 877                         , *points_str = NULL;
 878
 879         int group = GROUP_AVERAGE;
 880         uint32_t format = DATASOURCE_JSON;
 881         uint32_t options = 0x00000000;
 882
 883         while(url) {
 884                 char *value = mystrsep(&url, "?&[]");
 885                 if(!value || !*value) continue;
 886
 887                 char *name = mystrsep(&value, "=");
 888                 if(!name || !*name) continue;
 889                 if(!value || !*value) continue;
 890
 891                 debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
 892
 893                 // name and value are now the parameters
 894                 // they are not null and not empty
 895
 896                 if(!strcmp(name, "chart")) chart = value;
 897                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 898                         if(!dimensions) dimensions = buffer_create(strlen(value));
 899                         if(dimensions) {
 900                                 buffer_strcat(dimensions, "|");
 901                                 buffer_strcat(dimensions, value);
 902                         }
 903                 }
 904                 else if(!strcmp(name, "after")) after_str = value;
 905                 else if(!strcmp(name, "before")) before_str = value;
 906                 else if(!strcmp(name, "points")) points_str = value;
 907                 else if(!strcmp(name, "group")) {
 908                         group = web_client_api_request_v1_data_group(value);
 909                 }
 910                 else if(!strcmp(name, "format")) {
 911                         format = web_client_api_request_v1_data_format(value);
 912                 }
 913                 else if(!strcmp(name, "options")) {
 914                         options |= web_client_api_request_v1_data_options(value);
 915                 }
 916                 else if(!strcmp(name, "callback")) {
 917                         responseHandler = value;
 918                 }
 919                 else if(!strcmp(name, "filename")) {
 920                         outFileName = value;
 921                 }
 922                 else if(!strcmp(name, "tqx")) {
 923                         // parse Google Visualization API options
 924                         // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
 925                         char *tqx_name, *tqx_value;
 926
 927                         while(value) {
 928                                 tqx_value = mystrsep(&value, ";");
 929                                 if(!tqx_value || !*tqx_value) continue;
 930
 931                                 tqx_name = mystrsep(&tqx_value, ":");
 932                                 if(!tqx_name || !*tqx_name) continue;
 933                                 if(!tqx_value || !*tqx_value) continue;
 934
 935                                 if(!strcmp(tqx_name, "version"))
 936                                         google_version = tqx_value;
 937                                 else if(!strcmp(tqx_name, "reqId"))
 938                                         google_reqId = tqx_value;
 939                                 else if(!strcmp(tqx_name, "sig")) {
 940                                         google_sig = tqx_value;
 941                                         google_timestamp = strtoul(google_sig, NULL, 0);
 942                                 }
 943                                 else if(!strcmp(tqx_name, "out")) {
 944                                         google_out = tqx_value;
 945                                         format = web_client_api_request_v1_data_google_format(google_out);
 946                                 }
 947                                 else if(!strcmp(tqx_name, "responseHandler"))
 948                                         responseHandler = tqx_value;
 949                                 else if(!strcmp(tqx_name, "outFileName"))
 950                                         outFileName = tqx_value;
 951                         }
 952                 }
 953         }
 954
 955         if(!chart || !*chart) {
 956                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 957                 goto cleanup;
 958         }
 959
 960         RRDSET *st = rrdset_find(chart);
 961         if(!st) st = rrdset_find_byname(chart);
 962         if(!st) {
 963                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 964                 ret = 404;
 965                 goto cleanup;
 966         }
 967
 968         long long before = (before_str && *before_str)?atol(before_str):0;
 969         long long after  = (after_str  && *after_str) ?atol(after_str):0;
 970         int       points = (points_str && *points_str)?atoi(points_str):0;
 971
 972         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'"
 973                         , w->id
 974                         , chart
 975                         , (dimensions)?buffer_tostring(dimensions):""
 976                         , after
 977                         , before
 978                         , points
 979                         , group
 980                         , format
 981                         , options
 982                         );
 983
 984         if(outFileName && *outFileName) {
 985                 buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
 986                 debug(D_WEB_CLIENT, "%llu: generating outfilename header: '%s'", w->id, outFileName);
 987         }
 988
 989         if(format == DATASOURCE_DATATABLE_JSONP) {
 990                 if(responseHandler == NULL)
 991                         responseHandler = "google.visualization.Query.setResponse";
 992
 993                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 994                                 w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
 995                         );
 996
 997                 buffer_sprintf(w->response.data,
 998                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 999                         responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1000         }
1001         else if(format == DATASOURCE_JSONP) {
1002                 if(responseHandler == NULL)
1003                         responseHandler = "callback";
1004
1005                 buffer_strcat(w->response.data, responseHandler);
1006                 buffer_strcat(w->response.data, "(");
1007         }
1008
1009         ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
1010
1011         if(format == DATASOURCE_DATATABLE_JSONP) {
1012                 if(google_timestamp < last_timestamp_in_data)
1013                         buffer_strcat(w->response.data, "});");
1014
1015                 else {
1016                         // the client already has the latest data
1017                         buffer_flush(w->response.data);
1018                         buffer_sprintf(w->response.data,
1019                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1020                                 responseHandler, google_version, google_reqId);
1021                 }
1022         }
1023         else if(format == DATASOURCE_JSONP)
1024                 buffer_strcat(w->response.data, ");");
1025
1026 cleanup:
1027         if(dimensions) buffer_free(dimensions);
1028         return ret;
1029 }
1030
1031 int web_client_api_request_v1_registry(struct web_client *w, char *url)
1032 {
1033         static uint32_t hash_action = 0, hash_access = 0, hash_hello = 0, hash_delete = 0, hash_search = 0,
1034                         hash_switch = 0, hash_machine = 0, hash_url = 0, hash_name = 0, hash_delete_url = 0, hash_for = 0,
1035                         hash_to = 0 /*, hash_redirects = 0 */;
1036
1037         if(unlikely(!hash_action)) {
1038                 hash_action = simple_hash("action");
1039                 hash_access = simple_hash("access");
1040                 hash_hello = simple_hash("hello");
1041                 hash_delete = simple_hash("delete");
1042                 hash_search = simple_hash("search");
1043                 hash_switch = simple_hash("switch");
1044                 hash_machine = simple_hash("machine");
1045                 hash_url = simple_hash("url");
1046                 hash_name = simple_hash("name");
1047                 hash_delete_url = simple_hash("delete_url");
1048                 hash_for = simple_hash("for");
1049                 hash_to = simple_hash("to");
1050 /*
1051                 hash_redirects = simple_hash("redirects");
1052 */
1053         }
1054
1055         char person_guid[36 + 1] = "";
1056
1057         debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
1058
1059         // FIXME
1060         // The browser may send multiple cookies with our id
1061
1062         char *cookie = strstr(w->response.data->buffer, NETDATA_REGISTRY_COOKIE_NAME "=");
1063         if(cookie)
1064                 strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME)], 36);
1065
1066         char action = '\0';
1067         char *machine_guid = NULL,
1068                         *machine_url = NULL,
1069                         *url_name = NULL,
1070                         *search_machine_guid = NULL,
1071                         *delete_url = NULL,
1072                         *to_person_guid = NULL;
1073 /*
1074         int redirects = 0;
1075 */
1076
1077         while(url) {
1078                 char *value = mystrsep(&url, "?&[]");
1079                 if (!value || !*value) continue;
1080
1081                 char *name = mystrsep(&value, "=");
1082                 if (!name || !*name) continue;
1083                 if (!value || !*value) continue;
1084
1085                 debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
1086
1087                 uint32_t hash = simple_hash(name);
1088
1089                 if(hash == hash_action && !strcmp(name, "action")) {
1090                         uint32_t vhash = simple_hash(value);
1091
1092                         if(vhash == hash_access && !strcmp(value, "access")) action = 'A';
1093                         else if(vhash == hash_hello && !strcmp(value, "hello")) action = 'H';
1094                         else if(vhash == hash_delete && !strcmp(value, "delete")) action = 'D';
1095                         else if(vhash == hash_search && !strcmp(value, "search")) action = 'S';
1096                         else if(vhash == hash_switch && !strcmp(value, "switch")) action = 'W';
1097 #ifdef NETDATA_INTERNAL_CHECKS
1098             else error("unknown registry action '%s'", value);
1099 #endif /* NETDATA_INTERNAL_CHECKS */
1100                 }
1101 /*
1102                 else if(hash == hash_redirects && !strcmp(name, "redirects"))
1103                         redirects = atoi(value);
1104 */
1105                 else if(hash == hash_machine && !strcmp(name, "machine"))
1106                         machine_guid = value;
1107
1108                 else if(hash == hash_url && !strcmp(name, "url"))
1109                         machine_url = value;
1110
1111                 else if(action == 'A') {
1112                         if(hash == hash_name && !strcmp(name, "name"))
1113                                 url_name = value;
1114                 }
1115                 else if(action == 'D') {
1116                         if(hash == hash_delete_url && !strcmp(name, "delete_url"))
1117                                 delete_url = value;
1118                 }
1119                 else if(action == 'S') {
1120                         if(hash == hash_for && !strcmp(name, "for"))
1121                                 search_machine_guid = value;
1122                 }
1123                 else if(action == 'W') {
1124                         if(hash == hash_to && !strcmp(name, "to"))
1125                                 to_person_guid = value;
1126                 }
1127 #ifdef NETDATA_INTERNAL_CHECKS
1128                 else error("unused registry URL parameter '%s' with value '%s'", name, value);
1129 #endif /* NETDATA_INTERNAL_CHECKS */
1130         }
1131
1132         if(web_donotrack_comply && w->donottrack) {
1133                 buffer_flush(w->response.data);
1134                 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.");
1135                 return 400;
1136         }
1137
1138         if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
1139                 buffer_flush(w->response.data);
1140                 buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
1141                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
1142                 return 400;
1143         }
1144         else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
1145                 buffer_flush(w->response.data);
1146                 buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
1147                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
1148                 return 400;
1149         }
1150         else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
1151                 buffer_flush(w->response.data);
1152                 buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
1153                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
1154                 return 400;
1155         }
1156         else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
1157                 buffer_flush(w->response.data);
1158                 buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
1159                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
1160                 return 400;
1161         }
1162
1163         switch(action) {
1164                 case 'A':
1165                         w->tracking_required = 1;
1166                         if(registry_verify_cookies_redirects() > 0 && (!cookie || !person_guid[0])) {
1167                                 buffer_flush(w->response.data);
1168
1169                                 registry_set_cookie(w, "give-me-back-this-cookie-please");
1170                                 w->response.data->contenttype = CT_APPLICATION_JSON;
1171                                 buffer_sprintf(w->response.data, "{ \"status\": \"redirect\", \"registry\": \"%s\" }", registry_to_announce());
1172                                 return 200;
1173
1174 /*
1175  * it seems that web browsers are ignoring 307 (Moved Temporarily)
1176  * under certain conditions, when using CORS
1177  * so this is commented and we use application level redirects instead
1178  *
1179                                 redirects++;
1180
1181                                 if(redirects > registry_verify_cookies_redirects()) {
1182                                         buffer_flush(w->response.data);
1183                                         buffer_sprintf(w->response.data, "Your browser does not support cookies");
1184                                         return 400;
1185                                 }
1186
1187                                 char *encoded_url = url_encode(machine_url);
1188                                 if(!encoded_url) {
1189                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_url);
1190                                         return 500;
1191                                 }
1192
1193                                 char *encoded_name = url_encode(url_name);
1194                                 if(!encoded_name) {
1195                                         free(encoded_url);
1196                                         error("%llu: Cannot URL encode string '%s'", w->id, url_name);
1197                                         return 500;
1198                                 }
1199
1200                                 char *encoded_guid = url_encode(machine_guid);
1201                                 if(!encoded_guid) {
1202                                         free(encoded_url);
1203                                         free(encoded_name);
1204                                         error("%llu: Cannot URL encode string '%s'", w->id, machine_guid);
1205                                         return 500;
1206                                 }
1207
1208                                 buffer_sprintf(w->response.header, "Location: %s/api/v1/registry?action=access&machine=%s&name=%s&url=%s&redirects=%d\r\n",
1209                                                            registry_to_announce(), encoded_guid, encoded_name, encoded_url, redirects);
1210
1211                                 free(encoded_guid);
1212                                 free(encoded_name);
1213                                 free(encoded_url);
1214                                 return 307
1215 */
1216                         }
1217                         return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
1218
1219                 case 'D':
1220                         w->tracking_required = 1;
1221                         return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
1222
1223                 case 'S':
1224                         w->tracking_required = 1;
1225                         return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
1226
1227                 case 'W':
1228                         w->tracking_required = 1;
1229                         return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
1230
1231                 case 'H':
1232                         return registry_request_hello_json(w);
1233
1234                 default:
1235                         buffer_flush(w->response.data);
1236                         buffer_sprintf(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
1237                         return 400;
1238         }
1239
1240         buffer_flush(w->response.data);
1241         buffer_sprintf(w->response.data, "Invalid or no registry action.");
1242         return 400;
1243 }
1244
1245 int web_client_api_request_v1(struct web_client *w, char *url) {
1246         static uint32_t hash_data = 0, hash_chart = 0, hash_charts = 0, hash_registry = 0, hash_badge = 0;
1247
1248         if(unlikely(hash_data == 0)) {
1249                 hash_data = simple_hash("data");
1250                 hash_chart = simple_hash("chart");
1251                 hash_charts = simple_hash("charts");
1252                 hash_registry = simple_hash("registry");
1253                 hash_badge = simple_hash("badge.svg");
1254         }
1255
1256         // get the command
1257         char *tok = mystrsep(&url, "/?&");
1258         if(tok && *tok) {
1259                 debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
1260                 uint32_t hash = simple_hash(tok);
1261
1262                 if(hash == hash_data && !strcmp(tok, "data"))
1263                         return web_client_api_request_v1_data(w, url);
1264
1265                 else if(hash == hash_chart && !strcmp(tok, "chart"))
1266                         return web_client_api_request_v1_chart(w, url);
1267
1268                 else if(hash == hash_charts && !strcmp(tok, "charts"))
1269                         return web_client_api_request_v1_charts(w, url);
1270
1271                 else if(hash == hash_registry && !strcmp(tok, "registry"))
1272                         return web_client_api_request_v1_registry(w, url);
1273
1274                 else if(hash == hash_badge && !strcmp(tok, "badge.svg"))
1275                         return web_client_api_v1_badge(w, url);
1276
1277                 else {
1278                         buffer_flush(w->response.data);
1279                         buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
1280                         return 404;
1281                 }
1282         }
1283         else {
1284                 buffer_flush(w->response.data);
1285                 buffer_sprintf(w->response.data, "API v1 command?");
1286                 return 400;
1287         }
1288 }
1289
1290 int web_client_api_request(struct web_client *w, char *url)
1291 {
1292         // get the api version
1293         char *tok = mystrsep(&url, "/?&");
1294         if(tok && *tok) {
1295                 debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
1296                 if(strcmp(tok, "v1") == 0)
1297                         return web_client_api_request_v1(w, url);
1298                 else {
1299                         buffer_flush(w->response.data);
1300                         buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
1301                         return 404;
1302                 }
1303         }
1304         else {
1305                 buffer_flush(w->response.data);
1306                 buffer_sprintf(w->response.data, "Which API version?");
1307                 return 400;
1308         }
1309 }
1310
1311 int web_client_api_old_data_request(struct web_client *w, char *url, int datasource_type)
1312 {
1313         RRDSET *st = NULL;
1314
1315         char *args = strchr(url, '?');
1316         if(args) {
1317                 *args='\0';
1318                 args = &args[1];
1319         }
1320
1321         // get the name of the data to show
1322         char *tok = mystrsep(&url, "/");
1323
1324         // do we have such a data set?
1325         if(tok && *tok) {
1326                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1327                 st = rrdset_find_byname(tok);
1328                 if(!st) st = rrdset_find(tok);
1329         }
1330
1331         if(!st) {
1332                 // we don't have it
1333                 // try to send a file with that name
1334                 buffer_flush(w->response.data);
1335                 return(mysendfile(w, tok));
1336         }
1337
1338         // we have it
1339         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
1340
1341         // how many entries does the client want?
1342         long lines = rrd_default_history_entries;
1343         long group_count = 1;
1344         time_t after = 0, before = 0;
1345         int group_method = GROUP_AVERAGE;
1346         int nonzero = 0;
1347
1348         if(url) {
1349                 // parse the lines required
1350                 tok = mystrsep(&url, "/");
1351                 if(tok) lines = atoi(tok);
1352                 if(lines < 1) lines = 1;
1353         }
1354         if(url) {
1355                 // parse the group count required
1356                 tok = mystrsep(&url, "/");
1357                 if(tok && *tok) group_count = atoi(tok);
1358                 if(group_count < 1) group_count = 1;
1359                 //if(group_count > save_history / 20) group_count = save_history / 20;
1360         }
1361         if(url) {
1362                 // parse the grouping method required
1363                 tok = mystrsep(&url, "/");
1364                 if(tok && *tok) {
1365                         if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
1366                         else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
1367                         else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
1368                         else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
1369                 }
1370         }
1371         if(url) {
1372                 // parse after time
1373                 tok = mystrsep(&url, "/");
1374                 if(tok && *tok) after = strtoul(tok, NULL, 10);
1375                 if(after < 0) after = 0;
1376         }
1377         if(url) {
1378                 // parse before time
1379                 tok = mystrsep(&url, "/");
1380                 if(tok && *tok) before = strtoul(tok, NULL, 10);
1381                 if(before < 0) before = 0;
1382         }
1383         if(url) {
1384                 // parse nonzero
1385                 tok = mystrsep(&url, "/");
1386                 if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
1387         }
1388
1389         w->response.data->contenttype = CT_APPLICATION_JSON;
1390         buffer_flush(w->response.data);
1391
1392         char *google_version = "0.6";
1393         char *google_reqId = "0";
1394         char *google_sig = "0";
1395         char *google_out = "json";
1396         char *google_responseHandler = "google.visualization.Query.setResponse";
1397         char *google_outFileName = NULL;
1398         time_t last_timestamp_in_data = 0;
1399         if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
1400
1401                 w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1402
1403                 while(args) {
1404                         tok = mystrsep(&args, "&");
1405                         if(tok && *tok) {
1406                                 char *name = mystrsep(&tok, "=");
1407                                 if(name && *name && strcmp(name, "tqx") == 0) {
1408                                         char *key = mystrsep(&tok, ":");
1409                                         char *value = mystrsep(&tok, ";");
1410                                         if(key && value && *key && *value) {
1411                                                 if(strcmp(key, "version") == 0)
1412                                                         google_version = value;
1413
1414                                                 else if(strcmp(key, "reqId") == 0)
1415                                                         google_reqId = value;
1416
1417                                                 else if(strcmp(key, "sig") == 0)
1418                                                         google_sig = value;
1419
1420                                                 else if(strcmp(key, "out") == 0)
1421                                                         google_out = value;
1422
1423                                                 else if(strcmp(key, "responseHandler") == 0)
1424                                                         google_responseHandler = value;
1425
1426                                                 else if(strcmp(key, "outFileName") == 0)
1427                                                         google_outFileName = value;
1428                                         }
1429                                 }
1430                         }
1431                 }
1432
1433                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
1434                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
1435                         );
1436
1437                 if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1438                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
1439
1440                         // check the client wants json
1441                         if(strcmp(google_out, "json") != 0) {
1442                                 buffer_sprintf(w->response.data,
1443                                         "%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.'}]});",
1444                                         google_responseHandler, google_version, google_reqId, google_out);
1445                                         return 200;
1446                         }
1447                 }
1448         }
1449
1450         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1451                 buffer_sprintf(w->response.data,
1452                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
1453                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1454         }
1455
1456         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending RRD data '%s' (id %s, %d lines, %d group, %d group_method, %lu after, %lu before).", w->id, st->name, st->id, lines, group_count, group_method, after, before);
1457         time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, after, before, nonzero);
1458
1459         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1460                 if(timestamp_in_data > last_timestamp_in_data)
1461                         buffer_strcat(w->response.data, "});");
1462
1463                 else {
1464                         // the client already has the latest data
1465                         buffer_flush(w->response.data);
1466                         buffer_sprintf(w->response.data,
1467                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1468                                 google_responseHandler, google_version, google_reqId);
1469                 }
1470         }
1471
1472         return 200;
1473 }
1474
1475 const char *web_content_type_to_string(uint8_t contenttype) {
1476         switch(contenttype) {
1477                 case CT_TEXT_HTML:
1478                         return "text/html; charset=utf-8";
1479
1480                 case CT_APPLICATION_XML:
1481                         return "application/xml; charset=utf-8";
1482
1483                 case CT_APPLICATION_JSON:
1484                         return "application/json; charset=utf-8";
1485
1486                 case CT_APPLICATION_X_JAVASCRIPT:
1487                         return "application/x-javascript; charset=utf-8";
1488
1489                 case CT_TEXT_CSS:
1490                         return "text/css; charset=utf-8";
1491
1492                 case CT_TEXT_XML:
1493                         return "text/xml; charset=utf-8";
1494
1495                 case CT_TEXT_XSL:
1496                         return "text/xsl; charset=utf-8";
1497
1498                 case CT_APPLICATION_OCTET_STREAM:
1499                         return "application/octet-stream";
1500
1501                 case CT_IMAGE_SVG_XML:
1502                         return "image/svg+xml";
1503
1504                 case CT_APPLICATION_X_FONT_TRUETYPE:
1505                         return "application/x-font-truetype";
1506
1507                 case CT_APPLICATION_X_FONT_OPENTYPE:
1508                         return "application/x-font-opentype";
1509
1510                 case CT_APPLICATION_FONT_WOFF:
1511                         return "application/font-woff";
1512
1513                 case CT_APPLICATION_FONT_WOFF2:
1514                         return "application/font-woff2";
1515
1516                 case CT_APPLICATION_VND_MS_FONTOBJ:
1517                         return "application/vnd.ms-fontobject";
1518
1519                 case CT_IMAGE_PNG:
1520                         return "image/png";
1521
1522                 case CT_IMAGE_JPG:
1523                         return "image/jpeg";
1524
1525                 case CT_IMAGE_GIF:
1526                         return "image/gif";
1527
1528                 case CT_IMAGE_XICON:
1529                         return "image/x-icon";
1530
1531                 case CT_IMAGE_BMP:
1532                         return "image/bmp";
1533
1534                 case CT_IMAGE_ICNS:
1535                         return "image/icns";
1536
1537                 default:
1538                 case CT_TEXT_PLAIN:
1539                         return "text/plain; charset=utf-8";
1540         }
1541 }
1542
1543
1544 const char *web_response_code_to_string(int code) {
1545         switch(code) {
1546                 case 200:
1547                         return "OK";
1548
1549                 case 307:
1550                         return "Temporary Redirect";
1551
1552                 case 400:
1553                         return "Bad Request";
1554
1555                 case 403:
1556                         return "Forbidden";
1557
1558                 case 404:
1559                         return "Not Found";
1560
1561                 case 412:
1562                         return "Preconditions Failed";
1563
1564                 default:
1565                         if(code >= 100 && code < 200)
1566                                 return "Informational";
1567
1568                         if(code >= 200 && code < 300)
1569                                 return "Successful";
1570
1571                         if(code >= 300 && code < 400)
1572                                 return "Redirection";
1573
1574                         if(code >= 400 && code < 500)
1575                                 return "Bad Request";
1576
1577                         if(code >= 500 && code < 600)
1578                                 return "Server Error";
1579
1580                         return "Undefined Error";
1581         }
1582 }
1583
1584 static inline char *http_header_parse(struct web_client *w, char *s) {
1585         static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0, hash_donottrack = 0;
1586
1587         if(unlikely(!hash_origin)) {
1588                 hash_origin = simple_uhash("Origin");
1589                 hash_connection = simple_uhash("Connection");
1590                 hash_accept_encoding = simple_uhash("Accept-Encoding");
1591                 hash_donottrack = simple_uhash("DNT");
1592         }
1593
1594         char *e = s;
1595
1596         // find the :
1597         while(*e && *e != ':') e++;
1598         if(!*e) return e;
1599
1600         // get the name
1601         *e = '\0';
1602
1603         // find the value
1604         char *v = e + 1, *ve;
1605
1606         // skip leading spaces from value
1607         while(*v == ' ') v++;
1608         ve = v;
1609
1610         // find the \r
1611         while(*ve && *ve != '\r') ve++;
1612         if(!*ve || ve[1] != '\n') {
1613                 *e = ':';
1614                 return ve;
1615         }
1616
1617         // terminate the value
1618         *ve = '\0';
1619
1620         // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
1621         uint32_t hash = simple_uhash(s);
1622
1623         if(hash == hash_origin && !strcasecmp(s, "Origin"))
1624                 strncpyz(w->origin, v, ORIGIN_MAX);
1625
1626         else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
1627                 if(strcasestr(v, "keep-alive"))
1628                         w->keepalive = 1;
1629         }
1630         else if(web_donotrack_comply && hash == hash_donottrack && !strcasecmp(s, "DNT")) {
1631                 if(*v == '0') w->donottrack = 0;
1632                 else if(*v == '1') w->donottrack = 1;
1633         }
1634 #ifdef NETDATA_WITH_ZLIB
1635         else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
1636                 if(web_enable_gzip) {
1637                         if(strcasestr(v, "gzip"))
1638                                 web_client_enable_deflate(w, 1);
1639                         //
1640                         // does not seem to work
1641                         // else if(strcasestr(v, "deflate"))
1642                         //      web_client_enable_deflate(w, 0);
1643                 }
1644         }
1645 #endif /* NETDATA_WITH_ZLIB */
1646
1647         *e = ':';
1648         *ve = '\r';
1649         return ve;
1650 }
1651
1652 // http_request_validate()
1653 // returns:
1654 // = 0 : all good, process the request
1655 // > 0 : request is not supported
1656 // < 0 : request is incomplete - wait for more data
1657
1658 static inline int http_request_validate(struct web_client *w) {
1659         char *s = w->response.data->buffer, *encoded_url = NULL;
1660
1661         // is is a valid request?
1662         if(!strncmp(s, "GET ", 4)) {
1663                 encoded_url = s = &s[4];
1664                 w->mode = WEB_CLIENT_MODE_NORMAL;
1665         }
1666         else if(!strncmp(s, "OPTIONS ", 8)) {
1667                 encoded_url = s = &s[8];
1668                 w->mode = WEB_CLIENT_MODE_OPTIONS;
1669         }
1670         else {
1671                 w->wait_receive = 0;
1672                 return 1;
1673         }
1674
1675         // find the SPACE + "HTTP/"
1676         while(*s) {
1677                 // find the next space
1678                 while (*s && *s != ' ') s++;
1679
1680                 // is it SPACE + "HTTP/" ?
1681                 if(*s && !strncmp(s, " HTTP/", 6)) break;
1682                 else s++;
1683         }
1684
1685         // incomplete requests
1686         if(unlikely(!*s)) {
1687                 w->wait_receive = 1;
1688                 return -2;
1689         }
1690
1691         // we have the end of encoded_url - remember it
1692         char *ue = s;
1693
1694         // make sure we have complete request
1695         // complete requests contain: \r\n\r\n
1696         while(*s) {
1697                 // find a line feed
1698                 while(*s && *s++ != '\r');
1699
1700                 // did we reach the end?
1701                 if(unlikely(!*s)) break;
1702
1703                 // is it \r\n ?
1704                 if(likely(*s++ == '\n')) {
1705
1706                         // is it again \r\n ? (header end)
1707                         if(unlikely(*s == '\r' && s[1] == '\n')) {
1708                                 // a valid complete HTTP request found
1709
1710                                 *ue = '\0';
1711                                 url_decode_r(w->decoded_url, encoded_url, URL_MAX + 1);
1712                                 *ue = ' ';
1713
1714                                 // copy the URL - we are going to overwrite parts of it
1715                                 // FIXME -- we should avoid it
1716                                 strncpyz(w->last_url, w->decoded_url, URL_MAX);
1717
1718                                 w->wait_receive = 0;
1719                                 return 0;
1720                         }
1721
1722                         // another header line
1723                         s = http_header_parse(w, s);
1724                 }
1725         }
1726
1727         // incomplete request
1728         w->wait_receive = 1;
1729         return -3;
1730 }
1731
1732 void web_client_process(struct web_client *w) {
1733         static uint32_t hash_api = 0, hash_netdata_conf = 0, hash_data = 0, hash_datasource = 0, hash_graph = 0,
1734                         hash_list = 0, hash_all_json = 0, hash_exit = 0, hash_debug = 0, hash_mirror = 0;
1735
1736         if(unlikely(!hash_api)) {
1737                 hash_api = simple_hash("api");
1738                 hash_netdata_conf = simple_hash("netdata.conf");
1739                 hash_data = simple_hash(WEB_PATH_DATA);
1740                 hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
1741                 hash_graph = simple_hash(WEB_PATH_GRAPH);
1742                 hash_list = simple_hash("list");
1743                 hash_all_json = simple_hash("all.json");
1744                 hash_exit = simple_hash("exit");
1745                 hash_debug = simple_hash("debug");
1746                 hash_mirror = simple_hash("mirror");
1747         }
1748
1749         int code = 500;
1750         ssize_t bytes;
1751
1752         int what_to_do = http_request_validate(w);
1753
1754         // wait for more data
1755         if(what_to_do < 0) {
1756                 if(w->response.data->len > TOO_BIG_REQUEST) {
1757                         strcpy(w->last_url, "too big request");
1758
1759                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
1760
1761                         code = 400;
1762                         buffer_flush(w->response.data);
1763                         buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
1764                 }
1765                 else {
1766                         // wait for more data
1767                         return;
1768                 }
1769         }
1770         else if(what_to_do > 0) {
1771                 strcpy(w->last_url, "not a valid request");
1772
1773                 debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
1774
1775                 code = 500;
1776                 buffer_flush(w->response.data);
1777                 buffer_strcat(w->response.data, "I don't understand you...\r\n");
1778         }
1779         else { // what_to_do == 0
1780                 gettimeofday(&w->tv_in, NULL);
1781
1782                 if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1783                         code = 200;
1784                         w->response.data->contenttype = CT_TEXT_PLAIN;
1785                         buffer_flush(w->response.data);
1786                         buffer_strcat(w->response.data, "OK");
1787                 }
1788                 else {
1789                         char *url = w->decoded_url;
1790                         char *tok = mystrsep(&url, "/?");
1791                         if(tok && *tok) {
1792                                 uint32_t hash = simple_hash(tok);
1793                                 debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
1794
1795                                 if(hash == hash_api && strcmp(tok, "api") == 0) {
1796                                         // the client is requesting api access
1797                                         code = web_client_api_request(w, url);
1798                                 }
1799                                 else if(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0) {
1800                                         code = 200;
1801                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
1802
1803                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1804                                         buffer_flush(w->response.data);
1805                                         generate_config(w->response.data, 0);
1806                                 }
1807                                 else if(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
1808                                         // the client is requesting rrd data -- OLD API
1809                                         code = web_client_api_old_data_request(w, url, DATASOURCE_JSON);
1810                                 }
1811                                 else if(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
1812                                         // the client is requesting google datasource -- OLD API
1813                                         code = web_client_api_old_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
1814                                 }
1815                                 else if(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
1816                                         // the client is requesting an rrd graph -- OLD API
1817
1818                                         // get the name of the data to show
1819                                         tok = mystrsep(&url, "/?&");
1820                                         if(tok && *tok) {
1821                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1822
1823                                                 // do we have such a data set?
1824                                                 RRDSET *st = rrdset_find_byname(tok);
1825                                                 if(!st) st = rrdset_find(tok);
1826                                                 if(!st) {
1827                                                         // we don't have it
1828                                                         // try to send a file with that name
1829                                                         buffer_flush(w->response.data);
1830                                                         code = mysendfile(w, tok);
1831                                                 }
1832                                                 else {
1833                                                         code = 200;
1834                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
1835                                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1836                                                         buffer_flush(w->response.data);
1837                                                         rrd_stats_graph_json(st, url, w->response.data);
1838                                                 }
1839                                         }
1840                                         else {
1841                                                 code = 400;
1842                                                 buffer_flush(w->response.data);
1843                                                 buffer_strcat(w->response.data, "Graph name?\r\n");
1844                                         }
1845                                 }
1846                                 else if(hash == hash_list && strcmp(tok, "list") == 0) {
1847                                         // OLD API
1848                                         code = 200;
1849
1850                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
1851
1852                                         buffer_flush(w->response.data);
1853                                         RRDSET *st = rrdset_root;
1854
1855                                         for ( ; st ; st = st->next )
1856                                                 buffer_sprintf(w->response.data, "%s\n", st->name);
1857                                 }
1858                                 else if(hash == hash_all_json && strcmp(tok, "all.json") == 0) {
1859                                         // OLD API
1860                                         code = 200;
1861                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
1862
1863                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1864                                         buffer_flush(w->response.data);
1865                                         rrd_stats_all_json(w->response.data);
1866                                 }
1867 #ifdef NETDATA_INTERNAL_CHECKS
1868                                 else if(hash == hash_exit && strcmp(tok, "exit") == 0) {
1869                                         code = 200;
1870                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1871                                         buffer_flush(w->response.data);
1872
1873                                         if(!netdata_exit)
1874                                                 buffer_strcat(w->response.data, "ok, will do...");
1875                                         else
1876                                                 buffer_strcat(w->response.data, "I am doing it already");
1877
1878                                         netdata_exit = 1;
1879                                 }
1880                                 else if(hash == hash_debug && strcmp(tok, "debug") == 0) {
1881                                         buffer_flush(w->response.data);
1882
1883                                         // get the name of the data to show
1884                                         tok = mystrsep(&url, "/?&");
1885                                         if(tok && *tok) {
1886                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1887
1888                                                 // do we have such a data set?
1889                                                 RRDSET *st = rrdset_find_byname(tok);
1890                                                 if(!st) st = rrdset_find(tok);
1891                                                 if(!st) {
1892                                                         code = 404;
1893                                                         buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
1894                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
1895                                                 }
1896                                                 else {
1897                                                         code = 200;
1898                                                         debug_flags |= D_RRD_STATS;
1899                                                         st->debug = !st->debug;
1900                                                         buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
1901                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
1902                                                 }
1903                                         }
1904                                         else {
1905                                                 code = 500;
1906                                                 buffer_flush(w->response.data);
1907                                                 buffer_strcat(w->response.data, "debug which chart?\r\n");
1908                                         }
1909                                 }
1910                                 else if(hash == hash_mirror && strcmp(tok, "mirror") == 0) {
1911                                         code = 200;
1912
1913                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
1914
1915                                         // replace the zero bytes with spaces
1916                                         buffer_char_replace(w->response.data, '\0', ' ');
1917
1918                                         // just leave the buffer as is
1919                                         // it will be copied back to the client
1920                                 }
1921 #endif  /* NETDATA_INTERNAL_CHECKS */
1922                                 else {
1923                                         char filename[FILENAME_MAX+1];
1924                                         url = filename;
1925                                         strncpyz(filename, w->last_url, FILENAME_MAX);
1926                                         tok = mystrsep(&url, "?");
1927                                         buffer_flush(w->response.data);
1928                                         code = mysendfile(w, (tok && *tok)?tok:"/");
1929                                 }
1930                         }
1931                         else {
1932                                 char filename[FILENAME_MAX+1];
1933                                 url = filename;
1934                                 strncpyz(filename, w->last_url, FILENAME_MAX);
1935                                 tok = mystrsep(&url, "?");
1936                                 buffer_flush(w->response.data);
1937                                 code = mysendfile(w, (tok && *tok)?tok:"/");
1938                         }
1939                 }
1940         }
1941
1942         gettimeofday(&w->tv_ready, NULL);
1943         w->response.data->date = time(NULL);
1944         w->response.sent = 0;
1945         w->response.code = code;
1946
1947         // prepare the HTTP response header
1948         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
1949
1950         const char *content_type_string = web_content_type_to_string(w->response.data->contenttype);
1951         const char *code_msg = web_response_code_to_string(code);
1952
1953         char date[100];
1954         struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
1955         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
1956
1957         buffer_sprintf(w->response.header_output,
1958                 "HTTP/1.1 %d %s\r\n"
1959                 "Connection: %s\r\n"
1960                 "Server: NetData Embedded HTTP Server\r\n"
1961                 "Access-Control-Allow-Origin: %s\r\n"
1962                 "Access-Control-Allow-Credentials: true\r\n"
1963                 "Content-Type: %s\r\n"
1964                 "Date: %s\r\n"
1965                 , code, code_msg
1966                 , w->keepalive?"keep-alive":"close"
1967                 , w->origin
1968                 , content_type_string
1969                 , date
1970                 );
1971
1972         if(w->cookie1[0] || w->cookie2[0]) {
1973                 if(w->cookie1[0]) {
1974                         buffer_sprintf(w->response.header_output,
1975                            "Set-Cookie: %s\r\n",
1976                            w->cookie1);
1977                 }
1978
1979                 if(w->cookie2[0]) {
1980                         buffer_sprintf(w->response.header_output,
1981                            "Set-Cookie: %s\r\n",
1982                            w->cookie2);
1983                 }
1984
1985                 if(web_donotrack_comply)
1986                         buffer_sprintf(w->response.header_output,
1987                            "Tk: T;cookies\r\n");
1988         }
1989         else {
1990                 if(web_donotrack_comply) {
1991                         if(w->tracking_required)
1992                                 buffer_sprintf(w->response.header_output,
1993                                    "Tk: T;cookies\r\n");
1994                         else
1995                                 buffer_sprintf(w->response.header_output,
1996                                    "Tk: N\r\n");
1997                 }
1998         }
1999
2000         if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
2001                 buffer_strcat(w->response.header_output,
2002                         "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
2003                         "Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
2004                         "Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
2005                         );
2006         }
2007
2008         if(buffer_strlen(w->response.header))
2009                 buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
2010
2011         if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
2012                 buffer_sprintf(w->response.header_output,
2013                         "Expires: %s\r\n"
2014                         "Cache-Control: no-cache\r\n"
2015                         , date);
2016         }
2017         else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
2018                 char edate[100];
2019                 time_t et = w->response.data->date + (86400 * 14);
2020                 struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
2021                 strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
2022
2023                 buffer_sprintf(w->response.header_output,
2024                         "Expires: %s\r\n"
2025                         "Cache-Control: public\r\n"
2026                         , edate);
2027         }
2028
2029         // if we know the content length, put it
2030         if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
2031                 buffer_sprintf(w->response.header_output,
2032                         "Content-Length: %ld\r\n"
2033                         , w->response.data->len? w->response.data->len: w->response.rlen
2034                         );
2035         else if(!w->response.zoutput)
2036                 w->keepalive = 0;       // content-length is required for keep-alive
2037
2038         if(w->response.zoutput) {
2039                 buffer_strcat(w->response.header_output,
2040                         "Content-Encoding: gzip\r\n"
2041                         "Transfer-Encoding: chunked\r\n"
2042                         );
2043         }
2044
2045         buffer_strcat(w->response.header_output, "\r\n");
2046
2047         // sent the HTTP header
2048         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
2049                         , w->id
2050                         , buffer_strlen(w->response.header_output)
2051                         , buffer_tostring(w->response.header_output)
2052                         );
2053
2054         web_client_crock_socket(w);
2055
2056         bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
2057         if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
2058                 if(bytes > 0)
2059                         w->stats_sent_bytes += bytes;
2060
2061                 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,
2062                           buffer_strlen(w->response.header_output), bytes);
2063
2064                 WEB_CLIENT_IS_DEAD(w);
2065                 return;
2066         }
2067         else
2068                 w->stats_sent_bytes += bytes;
2069
2070         // enable sending immediately if we have data
2071         if(w->response.data->len) w->wait_send = 1;
2072         else w->wait_send = 0;
2073
2074         // pretty logging
2075         switch(w->mode) {
2076                 case WEB_CLIENT_MODE_OPTIONS:
2077                         debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2078                         break;
2079
2080                 case WEB_CLIENT_MODE_NORMAL:
2081                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
2082                         break;
2083
2084                 case WEB_CLIENT_MODE_FILECOPY:
2085                         if(w->response.rlen) {
2086                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
2087                                 w->wait_receive = 1;
2088
2089                                 /*
2090                                 // utilize the kernel sendfile() for copying the file to the socket.
2091                                 // this block of code can be commented, without anything missing.
2092                                 // when it is commented, the program will copy the data using async I/O.
2093                                 {
2094                                         long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
2095                                         if(len != w->response.data->rbytes)
2096                                                 error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
2097                                         else
2098                                                 web_client_reset(w);
2099                                 }
2100                                 */
2101                         }
2102                         else
2103                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
2104                         break;
2105
2106                 default:
2107                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
2108                         break;
2109         }
2110 }
2111
2112 ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
2113 {
2114         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
2115         char buf[1024];
2116         sprintf(buf, "%zX\r\n", len);
2117
2118         ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
2119         if(bytes > 0) {
2120                 debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
2121                 w->stats_sent_bytes += bytes;
2122         }
2123
2124         else if(bytes == 0) {
2125                 debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
2126                 WEB_CLIENT_IS_DEAD(w);
2127         }
2128         else {
2129                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk header to client.", w->id);
2130                 WEB_CLIENT_IS_DEAD(w);
2131         }
2132
2133         return bytes;
2134 }
2135
2136 ssize_t web_client_send_chunk_close(struct web_client *w)
2137 {
2138         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
2139
2140         ssize_t bytes = send(w->ofd, "\r\n", 2, 0);
2141         if(bytes > 0) {
2142                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2143                 w->stats_sent_bytes += bytes;
2144         }
2145
2146         else if(bytes == 0) {
2147                 debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
2148                 WEB_CLIENT_IS_DEAD(w);
2149         }
2150         else {
2151                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk suffix to client.", w->id);
2152                 WEB_CLIENT_IS_DEAD(w);
2153         }
2154
2155         return bytes;
2156 }
2157
2158 ssize_t web_client_send_chunk_finalize(struct web_client *w)
2159 {
2160         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
2161
2162         ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
2163         if(bytes > 0) {
2164                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
2165                 w->stats_sent_bytes += bytes;
2166         }
2167
2168         else if(bytes == 0) {
2169                 debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
2170                 WEB_CLIENT_IS_DEAD(w);
2171         }
2172         else {
2173                 debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
2174                 WEB_CLIENT_IS_DEAD(w);
2175         }
2176
2177         return bytes;
2178 }
2179
2180 #ifdef NETDATA_WITH_ZLIB
2181 ssize_t web_client_send_deflate(struct web_client *w)
2182 {
2183         ssize_t len = 0, t = 0;
2184
2185         // when using compression,
2186         // w->response.sent is the amount of bytes passed through compression
2187
2188         debug(D_DEFLATE, "%llu: web_client_send_deflate(): w->response.data->len = %d, w->response.sent = %d, w->response.zhave = %d, w->response.zsent = %d, w->response.zstream.avail_in = %d, w->response.zstream.avail_out = %d, w->response.zstream.total_in = %d, w->response.zstream.total_out = %d.", w->id, w->response.data->len, w->response.sent, w->response.zhave, w->response.zsent, w->response.zstream.avail_in, w->response.zstream.avail_out, w->response.zstream.total_in, w->response.zstream.total_out);
2189
2190         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) {
2191                 // there is nothing to send
2192
2193                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2194
2195                 // finalize the chunk
2196                 if(w->response.sent != 0) {
2197                         t = web_client_send_chunk_finalize(w);
2198                         if(t < 0) return t;
2199                 }
2200
2201                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2202                         // we have to wait, more data will come
2203                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2204                         w->wait_send = 0;
2205                         return t;
2206                 }
2207
2208                 if(unlikely(!w->keepalive)) {
2209                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2210                         WEB_CLIENT_IS_DEAD(w);
2211                         return t;
2212                 }
2213
2214                 // reset the client
2215                 web_client_reset(w);
2216                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
2217                 return t;
2218         }
2219
2220         if(w->response.zhave == w->response.zsent) {
2221                 // compress more input data
2222
2223                 // close the previous open chunk
2224                 if(w->response.sent != 0) {
2225                         t = web_client_send_chunk_close(w);
2226                         if(t < 0) return t;
2227                 }
2228
2229                 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);
2230
2231                 // give the compressor all the data not passed through the compressor yet
2232                 if(w->response.data->len > w->response.sent) {
2233                         w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
2234                         w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
2235                 }
2236
2237                 // reset the compressor output buffer
2238                 w->response.zstream.next_out = w->response.zbuffer;
2239                 w->response.zstream.avail_out = ZLIB_CHUNK;
2240
2241                 // ask for FINISH if we have all the input
2242                 int flush = Z_SYNC_FLUSH;
2243                 if(w->mode == WEB_CLIENT_MODE_NORMAL
2244                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
2245                         flush = Z_FINISH;
2246                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
2247                 }
2248                 else {
2249                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
2250                 }
2251
2252                 // compress
2253                 if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
2254                         error("%llu: Compression failed. Closing down client.", w->id);
2255                         web_client_reset(w);
2256                         return(-1);
2257                 }
2258
2259                 w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
2260                 w->response.zsent = 0;
2261
2262                 // keep track of the bytes passed through the compressor
2263                 w->response.sent = w->response.data->len;
2264
2265                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
2266
2267                 // open a new chunk
2268                 ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
2269                 if(t2 < 0) return t2;
2270                 t += t2;
2271         }
2272
2273         debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
2274
2275         len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
2276         if(len > 0) {
2277                 w->stats_sent_bytes += len;
2278                 w->response.zsent += len;
2279                 len += t;
2280                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
2281         }
2282         else if(len == 0) {
2283                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client (zhave = %ld, zsent = %ld, need to send = %ld).", w->id, w->response.zhave, w->response.zsent, w->response.zhave - w->response.zsent);
2284                 WEB_CLIENT_IS_DEAD(w);
2285         }
2286         else {
2287                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2288                 WEB_CLIENT_IS_DEAD(w);
2289         }
2290
2291         return(len);
2292 }
2293 #endif // NETDATA_WITH_ZLIB
2294
2295 ssize_t web_client_send(struct web_client *w) {
2296 #ifdef NETDATA_WITH_ZLIB
2297         if(likely(w->response.zoutput)) return web_client_send_deflate(w);
2298 #endif // NETDATA_WITH_ZLIB
2299
2300         ssize_t bytes;
2301
2302         if(unlikely(w->response.data->len - w->response.sent == 0)) {
2303                 // there is nothing to send
2304
2305                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
2306
2307                 // there can be two cases for this
2308                 // A. we have done everything
2309                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
2310
2311                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
2312                         // we have to wait, more data will come
2313                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
2314                         w->wait_send = 0;
2315                         return 0;
2316                 }
2317
2318                 if(unlikely(!w->keepalive)) {
2319                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2320                         WEB_CLIENT_IS_DEAD(w);
2321                         return 0;
2322                 }
2323
2324                 web_client_reset(w);
2325                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
2326                 return 0;
2327         }
2328
2329         bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
2330         if(likely(bytes > 0)) {
2331                 w->stats_sent_bytes += bytes;
2332                 w->response.sent += bytes;
2333                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
2334         }
2335         else if(likely(bytes == 0)) {
2336                 debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
2337                 WEB_CLIENT_IS_DEAD(w);
2338         }
2339         else {
2340                 debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
2341                 WEB_CLIENT_IS_DEAD(w);
2342         }
2343
2344         return(bytes);
2345 }
2346
2347 ssize_t web_client_receive(struct web_client *w)
2348 {
2349         // do we have any space for more data?
2350         buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
2351
2352         ssize_t left = w->response.data->size - w->response.data->len;
2353         ssize_t bytes;
2354
2355         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
2356                 bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
2357         else
2358                 bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
2359
2360         if(likely(bytes > 0)) {
2361                 if(w->mode != WEB_CLIENT_MODE_FILECOPY)
2362                         w->stats_received_bytes += bytes;
2363
2364                 size_t old = w->response.data->len;
2365                 w->response.data->len += bytes;
2366                 w->response.data->buffer[w->response.data->len] = '\0';
2367
2368                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
2369                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
2370
2371                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2372                         w->wait_send = 1;
2373
2374                         if(w->response.rlen && w->response.data->len >= w->response.rlen)
2375                                 w->wait_receive = 0;
2376                 }
2377         }
2378         else if(likely(bytes == 0)) {
2379                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
2380
2381                 // if we cannot read, it means we have an error on input.
2382                 // if however, we are copying a file from ifd to ofd, we should not return an error.
2383                 // in this case, the error should be generated when the file has been sent to the client.
2384
2385                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2386                         // we are copying data from ifd to ofd
2387                         // let it finish copying...
2388                         w->wait_receive = 0;
2389
2390                         debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
2391                         if(w->ifd != w->ofd) close(w->ifd);
2392                         w->ifd = w->ofd;
2393                 }
2394                 else {
2395                         debug(D_WEB_CLIENT, "%llu: failed to receive data.", w->id);
2396                         WEB_CLIENT_IS_DEAD(w);
2397                 }
2398         }
2399         else {
2400                 debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
2401                 WEB_CLIENT_IS_DEAD(w);
2402         }
2403
2404         return(bytes);
2405 }
2406
2407
2408 // --------------------------------------------------------------------------------------
2409 // the thread of a single client
2410
2411 // 1. waits for input and output, using async I/O
2412 // 2. it processes HTTP requests
2413 // 3. it generates HTTP responses
2414 // 4. it copies data from input to output if mode is FILECOPY
2415
2416 void *web_client_main(void *ptr)
2417 {
2418         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
2419                 error("Cannot set pthread cancel type to DEFERRED.");
2420
2421         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
2422                 error("Cannot set pthread cancel state to ENABLE.");
2423
2424         struct web_client *w = ptr;
2425         struct pollfd fds[2], *ifd, *ofd;
2426         int retval, fdmax = 0, timeout;
2427
2428         log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2429
2430         for(;;) {
2431                 if(unlikely(w->dead)) {
2432                         debug(D_WEB_CLIENT, "%llu: client is dead.", w->id);
2433                         break;
2434                 }
2435                 else if(unlikely(!w->wait_receive && !w->wait_send)) {
2436                         debug(D_WEB_CLIENT, "%llu: client is not set for neither receiving nor sending data.");
2437                         break;
2438                 }
2439
2440                 if(unlikely(w->ifd < 0 || w->ofd < 0)) {
2441                         error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
2442                         break;
2443                 }
2444
2445                 if(w->ifd == w->ofd) {
2446                         fds[0].fd = w->ifd;
2447                         fds[0].events = 0;
2448                         fds[0].revents = 0;
2449
2450                         if(w->wait_receive) fds[0].events |= POLLIN;
2451                         if(w->wait_send)    fds[0].events |= POLLOUT;
2452
2453                         fds[1].fd = -1;
2454                         fds[1].events = 0;
2455                         fds[1].revents = 0;
2456
2457                         ifd = ofd = &fds[0];
2458
2459                         fdmax = 1;
2460                 }
2461                 else {
2462                         fds[0].fd = w->ifd;
2463                         fds[0].events = 0;
2464                         fds[0].revents = 0;
2465                         if(w->wait_receive) fds[0].events |= POLLIN;
2466                         ifd = &fds[0];
2467
2468                         fds[1].fd = w->ofd;
2469                         fds[1].events = 0;
2470                         fds[1].revents = 0;
2471                         if(w->wait_send)    fds[1].events |= POLLOUT;
2472                         ofd = &fds[1];
2473
2474                         fdmax = 2;
2475                 }
2476
2477                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2478                 errno = 0;
2479                 timeout = web_client_timeout * 1000;
2480                 retval = poll(fds, fdmax, timeout);
2481
2482                 if(unlikely(retval == -1)) {
2483                         if(errno == EAGAIN || errno == EINTR) {
2484                                 debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
2485                                 continue;
2486                         }
2487
2488                         debug(D_WEB_CLIENT, "%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
2489                         break;
2490                 }
2491                 else if(unlikely(!retval)) {
2492                         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":"");
2493                         break;
2494                 }
2495
2496                 int used = 0;
2497                 if(w->wait_send && ofd->revents & POLLOUT) {
2498                         used++;
2499                         if(web_client_send(w) < 0) {
2500                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
2501                                 break;
2502                         }
2503                 }
2504
2505                 if(w->wait_receive && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
2506                         used++;
2507                         if(web_client_receive(w) < 0) {
2508                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
2509                                 break;
2510                         }
2511
2512                         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
2513                                 debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
2514                                 web_client_process(w);
2515                         }
2516                 }
2517
2518                 if(unlikely(!used)) {
2519                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
2520                         break;
2521                 }
2522         }
2523
2524         web_client_reset(w);
2525
2526         log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2527         debug(D_WEB_CLIENT, "%llu: done...", w->id);
2528
2529         // close the sockets/files now
2530         // to free file descriptors
2531         if(w->ifd == w->ofd) {
2532                 if(w->ifd != -1) close(w->ifd);
2533         }
2534         else {
2535                 if(w->ifd != -1) close(w->ifd);
2536                 if(w->ofd != -1) close(w->ofd);
2537         }
2538         w->ifd = -1;
2539         w->ofd = -1;
2540
2541         w->obsolete = 1;
2542
2543         pthread_exit(NULL);
2544         return NULL;
2545 }