src/web_client.c

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