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 #include <poll.h>
  20
  21 #include "common.h"
  22 #include "log.h"
  23 #include "appconfig.h"
  24 #include "url.h"
  25 #include "web_buffer.h"
  26 #include "web_server.h"
  27 #include "global_statistics.h"
  28 #include "rrd.h"
  29 #include "rrd2json.h"
  30 #include "registry.h"
  31
  32 #include "web_client.h"
  33 #include "../config.h"
  34
  35 #define INITIAL_WEB_DATA_LENGTH 16384
  36 #define WEB_REQUEST_LENGTH 16384
  37 #define TOO_BIG_REQUEST 16384
  38
  39 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
  40 int web_enable_gzip = 1;
  41
  42 extern int netdata_exit;
  43
  44 struct web_client *web_clients = NULL;
  45 unsigned long long web_clients_count = 0;
  46
  47 struct web_client *web_client_create(int listener)
  48 {
  49         struct web_client *w;
  50
  51         w = calloc(1, sizeof(struct web_client));
  52         if(!w) {
  53                 error("Cannot allocate new web_client memory.");
  54                 return NULL;
  55         }
  56
  57         w->id = ++web_clients_count;
  58         w->mode = WEB_CLIENT_MODE_NORMAL;
  59
  60         {
  61                 struct sockaddr *sadr;
  62                 socklen_t addrlen;
  63
  64                 sadr = (struct sockaddr*) &w->clientaddr;
  65                 addrlen = sizeof(w->clientaddr);
  66
  67                 w->ifd = accept(listener, sadr, &addrlen);
  68                 if (w->ifd == -1) {
  69                         error("%llu: Cannot accept new incoming connection.", w->id);
  70                         free(w);
  71                         return NULL;
  72                 }
  73                 w->ofd = w->ifd;
  74
  75                 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
  76                         error("Cannot getnameinfo() on received client connection.");
  77                         strncpyz(w->client_ip,   "UNKNOWN", NI_MAXHOST);
  78                         strncpyz(w->client_port, "UNKNOWN", NI_MAXSERV);
  79                 }
  80                 w->client_ip[NI_MAXHOST]   = '\0';
  81                 w->client_port[NI_MAXSERV] = '\0';
  82
  83                 switch(sadr->sa_family) {
  84
  85                 case AF_INET:
  86                         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);
  87                         break;
  88
  89                 case AF_INET6:
  90                         if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
  91                                 strcpy(w->client_ip, &w->client_ip[7]);
  92                                 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);
  93                         }
  94                         else
  95                                 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);
  96                         break;
  97
  98                 default:
  99                         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);
 100                         break;
 101                 }
 102
 103                 int flag = 1;
 104                 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0) error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
 105         }
 106
 107         w->response.data = buffer_create(INITIAL_WEB_DATA_LENGTH);
 108         if(unlikely(!w->response.data)) {
 109                 // no need for error log - web_buffer_create already logged the error
 110                 close(w->ifd);
 111                 free(w);
 112                 return NULL;
 113         }
 114
 115         w->response.header = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 116         if(unlikely(!w->response.header)) {
 117                 // no need for error log - web_buffer_create already logged the error
 118                 buffer_free(w->response.data);
 119                 close(w->ifd);
 120                 free(w);
 121                 return NULL;
 122         }
 123
 124         w->response.header_output = buffer_create(HTTP_RESPONSE_HEADER_SIZE);
 125         if(unlikely(!w->response.header_output)) {
 126                 // no need for error log - web_buffer_create already logged the error
 127                 buffer_free(w->response.header);
 128                 buffer_free(w->response.data);
 129                 close(w->ifd);
 130                 free(w);
 131                 return NULL;
 132         }
 133
 134         w->origin[0] = '*';
 135         w->wait_receive = 1;
 136
 137         if(web_clients) web_clients->prev = w;
 138         w->next = web_clients;
 139         web_clients = w;
 140
 141         global_statistics.connected_clients++;
 142
 143         return(w);
 144 }
 145
 146 void web_client_reset(struct web_client *w)
 147 {
 148         struct timeval tv;
 149         gettimeofday(&tv, NULL);
 150
 151         debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 152
 153         if(w->stats_received_bytes || w->stats_sent_bytes) {
 154                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 155                         global_statistics_lock();
 156
 157                 global_statistics.web_requests++;
 158                 global_statistics.web_usec += usecdiff(&tv, &w->tv_in);
 159                 global_statistics.bytes_received += w->stats_received_bytes;
 160                 global_statistics.bytes_sent += w->stats_sent_bytes;
 161
 162                 if(web_server_mode == WEB_SERVER_MODE_MULTI_THREADED)
 163                         global_statistics_unlock();
 164         }
 165         w->stats_received_bytes = 0;
 166         w->stats_sent_bytes = 0;
 167
 168         size_t sent = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 169
 170 #ifdef NETDATA_WITH_ZLIB
 171         if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
 172 #endif
 173
 174         size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
 175
 176         if(likely(w->last_url[0]))
 177                 log_access("%llu: (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: %d '%s'",
 178                         w->id,
 179                         sent, size, -((size>0)?((float)(size-sent)/(float)size * 100.0):0.0),
 180                         (float)usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
 181                         (float)usecdiff(&tv, &w->tv_ready) / 1000.0,
 182                         (float)usecdiff(&tv, &w->tv_in) / 1000.0,
 183                         (w->mode == WEB_CLIENT_MODE_FILECOPY)?"filecopy":((w->mode == WEB_CLIENT_MODE_OPTIONS)?"options":"data"),
 184                         w->response.code,
 185                         w->last_url
 186                 );
 187
 188         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
 189                 if(w->ifd != w->ofd) {
 190                         debug(D_WEB_CLIENT, "%llu: Closing filecopy input file descriptor %d.", w->id, w->ifd);
 191                         close(w->ifd);
 192                         w->ifd = w->ofd;
 193                 }
 194         }
 195
 196         w->last_url[0] = '\0';
 197         w->cookie1[0] = '\0';
 198         w->cookie2[0] = '\0';
 199         w->origin[0] = '*';
 200         w->origin[1] = '\0';
 201
 202         w->mode = WEB_CLIENT_MODE_NORMAL;
 203
 204         w->keepalive = 0;
 205         w->decoded_url[0] = '\0';
 206
 207         buffer_reset(w->response.header_output);
 208         buffer_reset(w->response.header);
 209         buffer_reset(w->response.data);
 210         w->response.rlen = 0;
 211         w->response.sent = 0;
 212         w->response.code = 0;
 213
 214         w->wait_receive = 1;
 215         w->wait_send = 0;
 216
 217         w->response.zoutput = 0;
 218
 219         // if we had enabled compression, release it
 220 #ifdef NETDATA_WITH_ZLIB
 221         if(w->response.zinitialized) {
 222                 debug(D_DEFLATE, "%llu: Reseting compression.", w->id);
 223                 deflateEnd(&w->response.zstream);
 224                 w->response.zsent = 0;
 225                 w->response.zhave = 0;
 226                 w->response.zstream.avail_in = 0;
 227                 w->response.zstream.avail_out = 0;
 228                 w->response.zstream.total_in = 0;
 229                 w->response.zstream.total_out = 0;
 230                 w->response.zinitialized = 0;
 231         }
 232 #endif // NETDATA_WITH_ZLIB
 233 }
 234
 235 struct web_client *web_client_free(struct web_client *w)
 236 {
 237         struct web_client *n = w->next;
 238         if(w == web_clients) web_clients = n;
 239
 240         debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 241
 242         if(w->prev)     w->prev->next = w->next;
 243         if(w->next) w->next->prev = w->prev;
 244         if(w->response.header_output) buffer_free(w->response.header_output);
 245         if(w->response.header) buffer_free(w->response.header);
 246         if(w->response.data) buffer_free(w->response.data);
 247         if(w->ifd != -1) close(w->ifd);
 248         if(w->ofd != -1 && w->ofd != w->ifd) close(w->ofd);
 249         free(w);
 250
 251         global_statistics.connected_clients--;
 252
 253         return(n);
 254 }
 255
 256 uid_t web_files_uid(void)
 257 {
 258         static char *web_owner = NULL;
 259         static uid_t owner_uid = 0;
 260
 261         if(unlikely(!web_owner)) {
 262                 web_owner = config_get("global", "web files owner", config_get("global", "run as user", ""));
 263                 if(!web_owner || !*web_owner)
 264                         owner_uid = geteuid();
 265                 else {
 266                         // getpwnam() is not thread safe,
 267                         // but we have called this function once
 268                         // while single threaded
 269                         struct passwd *pw = getpwnam(web_owner);
 270                         if(!pw) {
 271                                 error("User %s is not present. Ignoring option.", web_owner);
 272                                 owner_uid = geteuid();
 273                         }
 274                         else {
 275                                 debug(D_WEB_CLIENT, "Web files owner set to %s.\n", web_owner);
 276                                 owner_uid = pw->pw_uid;
 277                         }
 278                 }
 279         }
 280
 281         return(owner_uid);
 282 }
 283
 284 gid_t web_files_gid(void)
 285 {
 286         static char *web_group = NULL;
 287         static gid_t owner_gid = 0;
 288
 289         if(unlikely(!web_group)) {
 290                 web_group = config_get("global", "web files group", config_get("global", "web files owner", ""));
 291                 if(!web_group || !*web_group)
 292                         owner_gid = getegid();
 293                 else {
 294                         // getgrnam() is not thread safe,
 295                         // but we have called this function once
 296                         // while single threaded
 297                         struct group *gr = getgrnam(web_group);
 298                         if(!gr) {
 299                                 error("Group %s is not present. Ignoring option.", web_group);
 300                                 owner_gid = getegid();
 301                         }
 302                         else {
 303                                 debug(D_WEB_CLIENT, "Web files group set to %s.\n", web_group);
 304                                 owner_gid = gr->gr_gid;
 305                         }
 306                 }
 307         }
 308
 309         return(owner_gid);
 310 }
 311
 312 int mysendfile(struct web_client *w, char *filename)
 313 {
 314         static char *web_dir = NULL;
 315
 316         // initialize our static data
 317         if(unlikely(!web_dir)) web_dir = config_get("global", "web files directory", WEB_DIR);
 318
 319         debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, web_dir, filename);
 320
 321         // skip leading slashes
 322         while (*filename == '/') filename++;
 323
 324         // if the filename contain known paths, skip them
 325         if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE) + 1];
 326
 327         char *s;
 328         for(s = filename; *s ;s++) {
 329                 if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
 330                         debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 331                         buffer_sprintf(w->response.data, "File '%s' cannot be served. Filename contains invalid character '%c'", filename, *s);
 332                         return 400;
 333                 }
 334         }
 335
 336         // if the filename contains a .. refuse to serve it
 337         if(strstr(filename, "..") != 0) {
 338                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 339                 buffer_sprintf(w->response.data, "File '%s' cannot be served. Relative filenames with '..' in them are not supported.", filename);
 340                 return 400;
 341         }
 342
 343         // access the file
 344         char webfilename[FILENAME_MAX + 1];
 345         snprintfz(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
 346
 347         // check if the file exists
 348         struct stat stat;
 349         if(lstat(webfilename, &stat) != 0) {
 350                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
 351                 buffer_sprintf(w->response.data, "File '%s' does not exist, or is not accessible.", webfilename);
 352                 return 404;
 353         }
 354
 355         // check if the file is owned by expected user
 356         if(stat.st_uid != web_files_uid()) {
 357                 error("%llu: File '%s' is owned by user %d (expected user %d). Access Denied.", w->id, webfilename, stat.st_uid, web_files_uid());
 358                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 359                 return 403;
 360         }
 361
 362         // check if the file is owned by expected group
 363         if(stat.st_gid != web_files_gid()) {
 364                 error("%llu: File '%s' is owned by group %d (expected group %d). Access Denied.", w->id, webfilename, stat.st_gid, web_files_gid());
 365                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 366                 return 403;
 367         }
 368
 369         if((stat.st_mode & S_IFMT) == S_IFDIR) {
 370                 snprintfz(webfilename, FILENAME_MAX, "%s/index.html", filename);
 371                 return mysendfile(w, webfilename);
 372         }
 373
 374         if((stat.st_mode & S_IFMT) != S_IFREG) {
 375                 error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
 376                 buffer_sprintf(w->response.data, "Access to file '%s' is not permitted.", webfilename);
 377                 return 403;
 378         }
 379
 380         // open the file
 381         w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
 382         if(w->ifd == -1) {
 383                 w->ifd = w->ofd;
 384
 385                 if(errno == EBUSY || errno == EAGAIN) {
 386                         error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
 387                         buffer_sprintf(w->response.header, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
 388                         buffer_sprintf(w->response.data, "The file '%s' is currently busy. Please try again later.", webfilename);
 389                         return 307;
 390                 }
 391                 else {
 392                         error("%llu: Cannot open file '%s'.", w->id, webfilename);
 393                         buffer_sprintf(w->response.data, "Cannot open file '%s'.", webfilename);
 394                         return 404;
 395                 }
 396         }
 397
 398         // pick a Content-Type for the file
 399                  if(strstr(filename, ".html") != NULL)  w->response.data->contenttype = CT_TEXT_HTML;
 400         else if(strstr(filename, ".js")   != NULL)      w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 401         else if(strstr(filename, ".css")  != NULL)      w->response.data->contenttype = CT_TEXT_CSS;
 402         else if(strstr(filename, ".xml")  != NULL)      w->response.data->contenttype = CT_TEXT_XML;
 403         else if(strstr(filename, ".xsl")  != NULL)      w->response.data->contenttype = CT_TEXT_XSL;
 404         else if(strstr(filename, ".txt")  != NULL)  w->response.data->contenttype = CT_TEXT_PLAIN;
 405         else if(strstr(filename, ".svg")  != NULL)  w->response.data->contenttype = CT_IMAGE_SVG_XML;
 406         else if(strstr(filename, ".ttf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
 407         else if(strstr(filename, ".otf")  != NULL)  w->response.data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
 408         else if(strstr(filename, ".woff2")!= NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF2;
 409         else if(strstr(filename, ".woff") != NULL)  w->response.data->contenttype = CT_APPLICATION_FONT_WOFF;
 410         else if(strstr(filename, ".eot")  != NULL)  w->response.data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
 411         else if(strstr(filename, ".png")  != NULL)  w->response.data->contenttype = CT_IMAGE_PNG;
 412         else if(strstr(filename, ".jpg")  != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 413         else if(strstr(filename, ".jpeg") != NULL)  w->response.data->contenttype = CT_IMAGE_JPG;
 414         else if(strstr(filename, ".gif")  != NULL)  w->response.data->contenttype = CT_IMAGE_GIF;
 415         else if(strstr(filename, ".bmp")  != NULL)  w->response.data->contenttype = CT_IMAGE_BMP;
 416         else if(strstr(filename, ".ico")  != NULL)  w->response.data->contenttype = CT_IMAGE_XICON;
 417         else if(strstr(filename, ".icns") != NULL)  w->response.data->contenttype = CT_IMAGE_ICNS;
 418         else w->response.data->contenttype = CT_APPLICATION_OCTET_STREAM;
 419
 420         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);
 421
 422         w->mode = WEB_CLIENT_MODE_FILECOPY;
 423         w->wait_receive = 1;
 424         w->wait_send = 0;
 425         buffer_flush(w->response.data);
 426         w->response.rlen = stat.st_size;
 427         w->response.data->date = stat.st_mtim.tv_sec;
 428
 429         return 200;
 430 }
 431
 432
 433 #ifdef NETDATA_WITH_ZLIB
 434 void web_client_enable_deflate(struct web_client *w, int gzip) {
 435         if(w->response.zinitialized) {
 436                 error("%llu: Compression has already be initialized for this client.", w->id);
 437                 return;
 438         }
 439
 440         if(w->response.sent) {
 441                 error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
 442                 return;
 443         }
 444
 445         w->response.zstream.zalloc = Z_NULL;
 446         w->response.zstream.zfree = Z_NULL;
 447         w->response.zstream.opaque = Z_NULL;
 448
 449         w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
 450         w->response.zstream.avail_in = 0;
 451         w->response.zstream.total_in = 0;
 452
 453         w->response.zstream.next_out = w->response.zbuffer;
 454         w->response.zstream.avail_out = 0;
 455         w->response.zstream.total_out = 0;
 456
 457         w->response.zstream.zalloc = Z_NULL;
 458         w->response.zstream.zfree = Z_NULL;
 459         w->response.zstream.opaque = Z_NULL;
 460
 461 //      if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 462 //              error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 463 //              return;
 464 //      }
 465
 466         // Select GZIP compression: windowbits = 15 + 16 = 31
 467         if(deflateInit2(&w->response.zstream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 15 + ((gzip)?16:0), 8, Z_DEFAULT_STRATEGY) != Z_OK) {
 468                 error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 469                 return;
 470         }
 471
 472         w->response.zsent = 0;
 473         w->response.zoutput = 1;
 474         w->response.zinitialized = 1;
 475
 476         debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
 477 }
 478 #endif // NETDATA_WITH_ZLIB
 479
 480 uint32_t web_client_api_request_v1_data_options(char *o)
 481 {
 482         uint32_t ret = 0x00000000;
 483         char *tok;
 484
 485         while(o && *o && (tok = mystrsep(&o, ", |"))) {
 486                 if(!*tok) continue;
 487
 488                 if(!strcmp(tok, "nonzero"))
 489                         ret |= RRDR_OPTION_NONZERO;
 490                 else if(!strcmp(tok, "flip") || !strcmp(tok, "reversed") || !strcmp(tok, "reverse"))
 491                         ret |= RRDR_OPTION_REVERSED;
 492                 else if(!strcmp(tok, "jsonwrap"))
 493                         ret |= RRDR_OPTION_JSON_WRAP;
 494                 else if(!strcmp(tok, "min2max"))
 495                         ret |= RRDR_OPTION_MIN2MAX;
 496                 else if(!strcmp(tok, "ms") || !strcmp(tok, "milliseconds"))
 497                         ret |= RRDR_OPTION_MILLISECONDS;
 498                 else if(!strcmp(tok, "abs") || !strcmp(tok, "absolute") || !strcmp(tok, "absolute_sum") || !strcmp(tok, "absolute-sum"))
 499                         ret |= RRDR_OPTION_ABSOLUTE;
 500                 else if(!strcmp(tok, "seconds"))
 501                         ret |= RRDR_OPTION_SECONDS;
 502                 else if(!strcmp(tok, "null2zero"))
 503                         ret |= RRDR_OPTION_NULL2ZERO;
 504                 else if(!strcmp(tok, "objectrows"))
 505                         ret |= RRDR_OPTION_OBJECTSROWS;
 506                 else if(!strcmp(tok, "google_json"))
 507                         ret |= RRDR_OPTION_GOOGLE_JSON;
 508                 else if(!strcmp(tok, "percentage"))
 509                         ret |= RRDR_OPTION_PERCENTAGE;
 510         }
 511
 512         return ret;
 513 }
 514
 515 uint32_t web_client_api_request_v1_data_format(char *name)
 516 {
 517         if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSON)) // datatable
 518                 return DATASOURCE_DATATABLE_JSON;
 519
 520         else if(!strcmp(name, DATASOURCE_FORMAT_DATATABLE_JSONP)) // datasource
 521                 return DATASOURCE_DATATABLE_JSONP;
 522
 523         else if(!strcmp(name, DATASOURCE_FORMAT_JSON)) // json
 524                 return DATASOURCE_JSON;
 525
 526         else if(!strcmp(name, DATASOURCE_FORMAT_JSONP)) // jsonp
 527                 return DATASOURCE_JSONP;
 528
 529         else if(!strcmp(name, DATASOURCE_FORMAT_SSV)) // ssv
 530                 return DATASOURCE_SSV;
 531
 532         else if(!strcmp(name, DATASOURCE_FORMAT_CSV)) // csv
 533                 return DATASOURCE_CSV;
 534
 535         else if(!strcmp(name, DATASOURCE_FORMAT_TSV) || !strcmp(name, "tsv-excel")) // tsv
 536                 return DATASOURCE_TSV;
 537
 538         else if(!strcmp(name, DATASOURCE_FORMAT_HTML)) // html
 539                 return DATASOURCE_HTML;
 540
 541         else if(!strcmp(name, DATASOURCE_FORMAT_JS_ARRAY)) // array
 542                 return DATASOURCE_JS_ARRAY;
 543
 544         else if(!strcmp(name, DATASOURCE_FORMAT_SSV_COMMA)) // ssvcomma
 545                 return DATASOURCE_SSV_COMMA;
 546
 547         else if(!strcmp(name, DATASOURCE_FORMAT_CSV_JSON_ARRAY)) // csvjsonarray
 548                 return DATASOURCE_CSV_JSON_ARRAY;
 549
 550         return DATASOURCE_JSON;
 551 }
 552
 553 uint32_t web_client_api_request_v1_data_google_format(char *name)
 554 {
 555         if(!strcmp(name, "json"))
 556                 return DATASOURCE_DATATABLE_JSONP;
 557
 558         else if(!strcmp(name, "html"))
 559                 return DATASOURCE_HTML;
 560
 561         else if(!strcmp(name, "csv"))
 562                 return DATASOURCE_CSV;
 563
 564         else if(!strcmp(name, "tsv-excel"))
 565                 return DATASOURCE_TSV;
 566
 567         return DATASOURCE_JSON;
 568 }
 569
 570 int web_client_api_request_v1_data_group(char *name)
 571 {
 572         if(!strcmp(name, "max"))
 573                 return GROUP_MAX;
 574
 575         else if(!strcmp(name, "average"))
 576                 return GROUP_AVERAGE;
 577
 578         return GROUP_MAX;
 579 }
 580
 581 int web_client_api_request_v1_charts(struct web_client *w, char *url)
 582 {
 583         if(url) { ; }
 584
 585         buffer_flush(w->response.data);
 586         w->response.data->contenttype = CT_APPLICATION_JSON;
 587         rrd_stats_api_v1_charts(w->response.data);
 588         return 200;
 589 }
 590
 591 int web_client_api_request_v1_chart(struct web_client *w, char *url)
 592 {
 593         int ret = 400;
 594         char *chart = NULL;
 595
 596         buffer_flush(w->response.data);
 597
 598         while(url) {
 599                 char *value = mystrsep(&url, "?&[]");
 600                 if(!value || !*value) continue;
 601
 602                 char *name = mystrsep(&value, "=");
 603                 if(!name || !*name) continue;
 604                 if(!value || !*value) continue;
 605
 606                 // name and value are now the parameters
 607                 // they are not null and not empty
 608
 609                 if(!strcmp(name, "chart")) chart = value;
 610                 //else {
 611                 ///     buffer_sprintf(w->response.data, "Unknown parameter '%s' in request.", name);
 612                 //      goto cleanup;
 613                 //}
 614         }
 615
 616         if(!chart || !*chart) {
 617                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 618                 goto cleanup;
 619         }
 620
 621         RRDSET *st = rrdset_find(chart);
 622         if(!st) st = rrdset_find_byname(chart);
 623         if(!st) {
 624                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 625                 ret = 404;
 626                 goto cleanup;
 627         }
 628
 629         w->response.data->contenttype = CT_APPLICATION_JSON;
 630         rrd_stats_api_v1_chart(st, w->response.data);
 631         return 200;
 632
 633 cleanup:
 634         return ret;
 635 }
 636
 637 // returns the HTTP code
 638 int web_client_api_request_v1_data(struct web_client *w, char *url)
 639 {
 640         debug(D_WEB_CLIENT, "%llu: API v1 data with URL '%s'", w->id, url);
 641
 642         int ret = 400;
 643         BUFFER *dimensions = NULL;
 644
 645         buffer_flush(w->response.data);
 646
 647         char    *google_version = "0.6",
 648                         *google_reqId = "0",
 649                         *google_sig = "0",
 650                         *google_out = "json",
 651                         *responseHandler = NULL,
 652                         *outFileName = NULL;
 653
 654         time_t last_timestamp_in_data = 0, google_timestamp = 0;
 655
 656         char *chart = NULL
 657                         , *before_str = NULL
 658                         , *after_str = NULL
 659                         , *points_str = NULL;
 660
 661         int group = GROUP_MAX;
 662         uint32_t format = DATASOURCE_JSON;
 663         uint32_t options = 0x00000000;
 664
 665         while(url) {
 666                 char *value = mystrsep(&url, "?&[]");
 667                 if(!value || !*value) continue;
 668
 669                 char *name = mystrsep(&value, "=");
 670                 if(!name || !*name) continue;
 671                 if(!value || !*value) continue;
 672
 673                 debug(D_WEB_CLIENT, "%llu: API v1 data query param '%s' with value '%s'", w->id, name, value);
 674
 675                 // name and value are now the parameters
 676                 // they are not null and not empty
 677
 678                 if(!strcmp(name, "chart")) chart = value;
 679                 else if(!strcmp(name, "dimension") || !strcmp(name, "dim") || !strcmp(name, "dimensions") || !strcmp(name, "dims")) {
 680                         if(!dimensions) dimensions = buffer_create(strlen(value));
 681                         if(dimensions) {
 682                                 buffer_strcat(dimensions, "|");
 683                                 buffer_strcat(dimensions, value);
 684                         }
 685                 }
 686                 else if(!strcmp(name, "after")) after_str = value;
 687                 else if(!strcmp(name, "before")) before_str = value;
 688                 else if(!strcmp(name, "points")) points_str = value;
 689                 else if(!strcmp(name, "group")) {
 690                         group = web_client_api_request_v1_data_group(value);
 691                 }
 692                 else if(!strcmp(name, "format")) {
 693                         format = web_client_api_request_v1_data_format(value);
 694                 }
 695                 else if(!strcmp(name, "options")) {
 696                         options |= web_client_api_request_v1_data_options(value);
 697                 }
 698                 else if(!strcmp(name, "callback")) {
 699                         responseHandler = value;
 700                 }
 701                 else if(!strcmp(name, "filename")) {
 702                         outFileName = value;
 703                 }
 704                 else if(!strcmp(name, "tqx")) {
 705                         // parse Google Visualization API options
 706                         // https://developers.google.com/chart/interactive/docs/dev/implementing_data_source
 707                         char *tqx_name, *tqx_value;
 708
 709                         while(value) {
 710                                 tqx_value = mystrsep(&value, ";");
 711                                 if(!tqx_value || !*tqx_value) continue;
 712
 713                                 tqx_name = mystrsep(&tqx_value, ":");
 714                                 if(!tqx_name || !*tqx_name) continue;
 715                                 if(!tqx_value || !*tqx_value) continue;
 716
 717                                 if(!strcmp(tqx_name, "version"))
 718                                         google_version = tqx_value;
 719                                 else if(!strcmp(tqx_name, "reqId"))
 720                                         google_reqId = tqx_value;
 721                                 else if(!strcmp(tqx_name, "sig")) {
 722                                         google_sig = tqx_value;
 723                                         google_timestamp = strtoul(google_sig, NULL, 0);
 724                                 }
 725                                 else if(!strcmp(tqx_name, "out")) {
 726                                         google_out = tqx_value;
 727                                         format = web_client_api_request_v1_data_google_format(google_out);
 728                                 }
 729                                 else if(!strcmp(tqx_name, "responseHandler"))
 730                                         responseHandler = tqx_value;
 731                                 else if(!strcmp(tqx_name, "outFileName"))
 732                                         outFileName = tqx_value;
 733                         }
 734                 }
 735         }
 736
 737         if(!chart || !*chart) {
 738                 buffer_sprintf(w->response.data, "No chart id is given at the request.");
 739                 goto cleanup;
 740         }
 741
 742         RRDSET *st = rrdset_find(chart);
 743         if(!st) st = rrdset_find_byname(chart);
 744         if(!st) {
 745                 buffer_sprintf(w->response.data, "Chart '%s' is not found.", chart);
 746                 ret = 404;
 747                 goto cleanup;
 748         }
 749
 750         long long before = (before_str && *before_str)?atol(before_str):0;
 751         long long after  = (after_str  && *after_str) ?atol(after_str):0;
 752         int       points = (points_str && *points_str)?atoi(points_str):0;
 753
 754         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'"
 755                         , w->id
 756                         , chart
 757                         , (dimensions)?buffer_tostring(dimensions):""
 758                         , after
 759                         , before
 760                         , points
 761                         , group
 762                         , format
 763                         , options
 764                         );
 765
 766         if(outFileName && *outFileName) {
 767                 buffer_sprintf(w->response.header, "Content-Disposition: attachment; filename=\"%s\"\r\n", outFileName);
 768                 error("generating outfilename header: '%s'", outFileName);
 769         }
 770
 771         if(format == DATASOURCE_DATATABLE_JSONP) {
 772                 if(responseHandler == NULL)
 773                         responseHandler = "google.visualization.Query.setResponse";
 774
 775                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSON/JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 776                                 w->id, google_version, google_reqId, google_sig, google_out, responseHandler, outFileName
 777                         );
 778
 779                 buffer_sprintf(w->response.data,
 780                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 781                         responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
 782         }
 783         else if(format == DATASOURCE_JSONP) {
 784                 if(responseHandler == NULL)
 785                         responseHandler = "callback";
 786
 787                 buffer_strcat(w->response.data, responseHandler);
 788                 buffer_strcat(w->response.data, "(");
 789         }
 790
 791         ret = rrd2format(st, w->response.data, dimensions, format, points, after, before, group, options, &last_timestamp_in_data);
 792
 793         if(format == DATASOURCE_DATATABLE_JSONP) {
 794                 if(google_timestamp < last_timestamp_in_data)
 795                         buffer_strcat(w->response.data, "});");
 796
 797                 else {
 798                         // the client already has the latest data
 799                         buffer_flush(w->response.data);
 800                         buffer_sprintf(w->response.data,
 801                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
 802                                 responseHandler, google_version, google_reqId);
 803                 }
 804         }
 805         else if(format == DATASOURCE_JSONP)
 806                 buffer_strcat(w->response.data, ");");
 807
 808 cleanup:
 809         if(dimensions) buffer_free(dimensions);
 810         return ret;
 811 }
 812
 813 int web_client_api_request_v1_registry(struct web_client *w, char *url)
 814 {
 815         static uint32_t hash_action = 0, hash_access = 0, hash_hello = 0, hash_delete = 0, hash_search = 0,
 816                         hash_switch = 0, hash_machine = 0, hash_url = 0, hash_name = 0, hash_delete_url = 0, hash_for = 0,
 817                         hash_to = 0;
 818
 819         if(unlikely(!hash_action)) {
 820                 hash_action = simple_hash("action");
 821                 hash_access = simple_hash("access");
 822                 hash_hello = simple_hash("hello");
 823                 hash_delete = simple_hash("delete");
 824                 hash_search = simple_hash("search");
 825                 hash_switch = simple_hash("switch");
 826                 hash_machine = simple_hash("machine");
 827                 hash_url = simple_hash("url");
 828                 hash_name = simple_hash("name");
 829                 hash_delete_url = simple_hash("delete_url");
 830                 hash_for = simple_hash("for");
 831                 hash_to = simple_hash("to");
 832         }
 833
 834         char person_guid[36 + 1] = "";
 835
 836         debug(D_WEB_CLIENT, "%llu: API v1 registry with URL '%s'", w->id, url);
 837
 838         // FIXME
 839         // The browser may send multiple cookies with our id
 840
 841         char *cookie = strstr(w->response.data->buffer, " " NETDATA_REGISTRY_COOKIE_NAME "=");
 842         if(cookie)
 843                 strncpyz(person_guid, &cookie[sizeof(NETDATA_REGISTRY_COOKIE_NAME) + 1], 36);
 844
 845         char action = '\0';
 846         char *machine_guid = NULL,
 847                         *machine_url = NULL,
 848                         *url_name = NULL,
 849                         *search_machine_guid = NULL,
 850                         *delete_url = NULL,
 851                         *to_person_guid = NULL;
 852
 853         while(url) {
 854                 char *value = mystrsep(&url, "?&[]");
 855                 if (!value || !*value) continue;
 856
 857                 char *name = mystrsep(&value, "=");
 858                 if (!name || !*name) continue;
 859                 if (!value || !*value) continue;
 860
 861                 debug(D_WEB_CLIENT, "%llu: API v1 registry query param '%s' with value '%s'", w->id, name, value);
 862
 863                 uint32_t hash = simple_hash(name);
 864
 865                 if(hash == hash_action && !strcmp(name, "action")) {
 866                         uint32_t vhash = simple_hash(value);
 867
 868                         if(vhash == hash_access && !strcmp(value, "access")) action = 'A';
 869                         else if(vhash == hash_hello && !strcmp(value, "hello")) action = 'H';
 870                         else if(vhash == hash_delete && !strcmp(value, "delete")) action = 'D';
 871                         else if(vhash == hash_search && !strcmp(value, "search")) action = 'S';
 872                         else if(vhash == hash_switch && !strcmp(value, "switch")) action = 'W';
 873                 }
 874                 else if(hash == hash_machine && !strcmp(name, "machine"))
 875                         machine_guid = value;
 876
 877                 else if(hash == hash_url && !strcmp(name, "url"))
 878                         machine_url = value;
 879
 880                 else if(action == 'A') {
 881                         if(hash == hash_name && !strcmp(name, "name"))
 882                                 url_name = value;
 883                 }
 884                 else if(action == 'D') {
 885                         if(hash == hash_delete_url && !strcmp(name, "delete_url"))
 886                                 delete_url = value;
 887                 }
 888                 else if(action == 'S') {
 889                         if(hash == hash_for && !strcmp(name, "for"))
 890                                 search_machine_guid = value;
 891                 }
 892                 else if(action == 'W') {
 893                         if(hash == hash_to && !strcmp(name, "to"))
 894                                 to_person_guid = value;
 895                 }
 896         }
 897
 898         if(action == 'A' && (!machine_guid || !machine_url || !url_name)) {
 899                 buffer_flush(w->response.data);
 900                 buffer_sprintf(w->response.data, "Invalid registry request - access requires these parameters: machine ('%s'), url ('%s'), name ('%s')",
 901                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", url_name?url_name:"UNSET");
 902                 return 400;
 903         }
 904         else if(action == 'D' && (!machine_guid || !machine_url || !delete_url)) {
 905                 buffer_flush(w->response.data);
 906                 buffer_sprintf(w->response.data, "Invalid registry request - delete requires these parameters: machine ('%s'), url ('%s'), delete_url ('%s')",
 907                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", delete_url?delete_url:"UNSET");
 908                 return 400;
 909         }
 910         else if(action == 'S' && (!machine_guid || !machine_url || !search_machine_guid)) {
 911                 buffer_flush(w->response.data);
 912                 buffer_sprintf(w->response.data, "Invalid registry request - search requires these parameters: machine ('%s'), url ('%s'), for ('%s')",
 913                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", search_machine_guid?search_machine_guid:"UNSET");
 914                 return 400;
 915         }
 916         else if(action == 'W' && (!machine_guid || !machine_url || !to_person_guid)) {
 917                 buffer_flush(w->response.data);
 918                 buffer_sprintf(w->response.data, "Invalid registry request - switching identity requires these parameters: machine ('%s'), url ('%s'), to ('%s')",
 919                                            machine_guid?machine_guid:"UNSET", machine_url?machine_url:"UNSET", to_person_guid?to_person_guid:"UNSET");
 920                 return 400;
 921         }
 922
 923         switch(action) {
 924                 case 'A':
 925                         return registry_request_access_json(w, person_guid, machine_guid, machine_url, url_name, time(NULL));
 926
 927                 case 'D':
 928                         return registry_request_delete_json(w, person_guid, machine_guid, machine_url, delete_url, time(NULL));
 929
 930                 case 'S':
 931                         return registry_request_search_json(w, person_guid, machine_guid, machine_url, search_machine_guid, time(NULL));
 932
 933                 case 'W':
 934                         return registry_request_switch_json(w, person_guid, machine_guid, machine_url, to_person_guid, time(NULL));
 935
 936                 case 'H':
 937                         return registry_request_hello_json(w);
 938
 939                 default:
 940                         buffer_flush(w->response.data);
 941                         buffer_sprintf(w->response.data, "Invalid registry request - you need to set an action: hello, access, delete, search");
 942                         return 400;
 943         }
 944
 945         buffer_flush(w->response.data);
 946         buffer_sprintf(w->response.data, "Invalid or no registry action.");
 947         return 400;
 948 }
 949
 950 int web_client_api_request_v1(struct web_client *w, char *url)
 951 {
 952         static uint32_t hash_data = 0, hash_chart = 0, hash_charts = 0, hash_registry = 0;
 953
 954         if(unlikely(hash_data == 0)) {
 955                 hash_data = simple_hash("data");
 956                 hash_chart = simple_hash("chart");
 957                 hash_charts = simple_hash("charts");
 958                 hash_registry = simple_hash("registry");
 959         }
 960
 961         // get the command
 962         char *tok = mystrsep(&url, "/?&");
 963         if(tok && *tok) {
 964                 debug(D_WEB_CLIENT, "%llu: Searching for API v1 command '%s'.", w->id, tok);
 965                 uint32_t hash = simple_hash(tok);
 966
 967                 if(hash == hash_data && !strcmp(tok, "data"))
 968                         return web_client_api_request_v1_data(w, url);
 969
 970                 else if(hash == hash_chart && !strcmp(tok, "chart"))
 971                         return web_client_api_request_v1_chart(w, url);
 972
 973                 else if(hash == hash_charts && !strcmp(tok, "charts"))
 974                         return web_client_api_request_v1_charts(w, url);
 975
 976                 else if(hash == hash_registry && !strcmp(tok, "registry"))
 977                         return web_client_api_request_v1_registry(w, url);
 978
 979                 else {
 980                         buffer_flush(w->response.data);
 981                         buffer_sprintf(w->response.data, "Unsupported v1 API command: %s", tok);
 982                         return 404;
 983                 }
 984         }
 985         else {
 986                 buffer_flush(w->response.data);
 987                 buffer_sprintf(w->response.data, "API v1 command?");
 988                 return 400;
 989         }
 990 }
 991
 992 int web_client_api_request(struct web_client *w, char *url)
 993 {
 994         // get the api version
 995         char *tok = mystrsep(&url, "/?&");
 996         if(tok && *tok) {
 997                 debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
 998                 if(strcmp(tok, "v1") == 0)
 999                         return web_client_api_request_v1(w, url);
1000                 else {
1001                         buffer_flush(w->response.data);
1002                         buffer_sprintf(w->response.data, "Unsupported API version: %s", tok);
1003                         return 404;
1004                 }
1005         }
1006         else {
1007                 buffer_flush(w->response.data);
1008                 buffer_sprintf(w->response.data, "Which API version?");
1009                 return 400;
1010         }
1011 }
1012
1013 int web_client_api_old_data_request(struct web_client *w, char *url, int datasource_type)
1014 {
1015         RRDSET *st = NULL;
1016
1017         char *args = strchr(url, '?');
1018         if(args) {
1019                 *args='\0';
1020                 args = &args[1];
1021         }
1022
1023         // get the name of the data to show
1024         char *tok = mystrsep(&url, "/");
1025
1026         // do we have such a data set?
1027         if(tok && *tok) {
1028                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1029                 st = rrdset_find_byname(tok);
1030                 if(!st) st = rrdset_find(tok);
1031         }
1032
1033         if(!st) {
1034                 // we don't have it
1035                 // try to send a file with that name
1036                 buffer_flush(w->response.data);
1037                 return(mysendfile(w, tok));
1038         }
1039
1040         // we have it
1041         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
1042
1043         // how many entries does the client want?
1044         long lines = rrd_default_history_entries;
1045         long group_count = 1;
1046         time_t after = 0, before = 0;
1047         int group_method = GROUP_AVERAGE;
1048         int nonzero = 0;
1049
1050         if(url) {
1051                 // parse the lines required
1052                 tok = mystrsep(&url, "/");
1053                 if(tok) lines = atoi(tok);
1054                 if(lines < 1) lines = 1;
1055         }
1056         if(url) {
1057                 // parse the group count required
1058                 tok = mystrsep(&url, "/");
1059                 if(tok && *tok) group_count = atoi(tok);
1060                 if(group_count < 1) group_count = 1;
1061                 //if(group_count > save_history / 20) group_count = save_history / 20;
1062         }
1063         if(url) {
1064                 // parse the grouping method required
1065                 tok = mystrsep(&url, "/");
1066                 if(tok && *tok) {
1067                         if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
1068                         else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
1069                         else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
1070                         else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
1071                 }
1072         }
1073         if(url) {
1074                 // parse after time
1075                 tok = mystrsep(&url, "/");
1076                 if(tok && *tok) after = strtoul(tok, NULL, 10);
1077                 if(after < 0) after = 0;
1078         }
1079         if(url) {
1080                 // parse before time
1081                 tok = mystrsep(&url, "/");
1082                 if(tok && *tok) before = strtoul(tok, NULL, 10);
1083                 if(before < 0) before = 0;
1084         }
1085         if(url) {
1086                 // parse nonzero
1087                 tok = mystrsep(&url, "/");
1088                 if(tok && *tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
1089         }
1090
1091         w->response.data->contenttype = CT_APPLICATION_JSON;
1092         buffer_flush(w->response.data);
1093
1094         char *google_version = "0.6";
1095         char *google_reqId = "0";
1096         char *google_sig = "0";
1097         char *google_out = "json";
1098         char *google_responseHandler = "google.visualization.Query.setResponse";
1099         char *google_outFileName = NULL;
1100         time_t last_timestamp_in_data = 0;
1101         if(datasource_type == DATASOURCE_DATATABLE_JSON || datasource_type == DATASOURCE_DATATABLE_JSONP) {
1102
1103                 w->response.data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
1104
1105                 while(args) {
1106                         tok = mystrsep(&args, "&");
1107                         if(tok && *tok) {
1108                                 char *name = mystrsep(&tok, "=");
1109                                 if(name && *name && strcmp(name, "tqx") == 0) {
1110                                         char *key = mystrsep(&tok, ":");
1111                                         char *value = mystrsep(&tok, ";");
1112                                         if(key && value && *key && *value) {
1113                                                 if(strcmp(key, "version") == 0)
1114                                                         google_version = value;
1115
1116                                                 else if(strcmp(key, "reqId") == 0)
1117                                                         google_reqId = value;
1118
1119                                                 else if(strcmp(key, "sig") == 0)
1120                                                         google_sig = value;
1121
1122                                                 else if(strcmp(key, "out") == 0)
1123                                                         google_out = value;
1124
1125                                                 else if(strcmp(key, "responseHandler") == 0)
1126                                                         google_responseHandler = value;
1127
1128                                                 else if(strcmp(key, "outFileName") == 0)
1129                                                         google_outFileName = value;
1130                                         }
1131                                 }
1132                         }
1133                 }
1134
1135                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
1136                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
1137                         );
1138
1139                 if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1140                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
1141
1142                         // check the client wants json
1143                         if(strcmp(google_out, "json") != 0) {
1144                                 buffer_sprintf(w->response.data,
1145                                         "%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.'}]});",
1146                                         google_responseHandler, google_version, google_reqId, google_out);
1147                                         return 200;
1148                         }
1149                 }
1150         }
1151
1152         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1153                 buffer_sprintf(w->response.data,
1154                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
1155                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
1156         }
1157
1158         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);
1159         time_t timestamp_in_data = rrd_stats_json(datasource_type, st, w->response.data, lines, group_count, group_method, after, before, nonzero);
1160
1161         if(datasource_type == DATASOURCE_DATATABLE_JSONP) {
1162                 if(timestamp_in_data > last_timestamp_in_data)
1163                         buffer_strcat(w->response.data, "});");
1164
1165                 else {
1166                         // the client already has the latest data
1167                         buffer_flush(w->response.data);
1168                         buffer_sprintf(w->response.data,
1169                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
1170                                 google_responseHandler, google_version, google_reqId);
1171                 }
1172         }
1173
1174         return 200;
1175 }
1176
1177 const char *web_content_type_to_string(uint8_t contenttype) {
1178         switch(contenttype) {
1179                 case CT_TEXT_HTML:
1180                         return "text/html; charset=utf-8";
1181
1182                 case CT_APPLICATION_XML:
1183                         return "application/xml; charset=utf-8";
1184
1185                 case CT_APPLICATION_JSON:
1186                         return "application/json; charset=utf-8";
1187
1188                 case CT_APPLICATION_X_JAVASCRIPT:
1189                         return "application/x-javascript; charset=utf-8";
1190
1191                 case CT_TEXT_CSS:
1192                         return "text/css; charset=utf-8";
1193
1194                 case CT_TEXT_XML:
1195                         return "text/xml; charset=utf-8";
1196
1197                 case CT_TEXT_XSL:
1198                         return "text/xsl; charset=utf-8";
1199
1200                 case CT_APPLICATION_OCTET_STREAM:
1201                         return "application/octet-stream";
1202
1203                 case CT_IMAGE_SVG_XML:
1204                         return "image/svg+xml";
1205
1206                 case CT_APPLICATION_X_FONT_TRUETYPE:
1207                         return "application/x-font-truetype";
1208
1209                 case CT_APPLICATION_X_FONT_OPENTYPE:
1210                         return "application/x-font-opentype";
1211
1212                 case CT_APPLICATION_FONT_WOFF:
1213                         return "application/font-woff";
1214
1215                 case CT_APPLICATION_FONT_WOFF2:
1216                         return "application/font-woff2";
1217
1218                 case CT_APPLICATION_VND_MS_FONTOBJ:
1219                         return "application/vnd.ms-fontobject";
1220
1221                 case CT_IMAGE_PNG:
1222                         return "image/png";
1223
1224                 case CT_IMAGE_JPG:
1225                         return "image/jpeg";
1226
1227                 case CT_IMAGE_GIF:
1228                         return "image/gif";
1229
1230                 case CT_IMAGE_XICON:
1231                         return "image/x-icon";
1232
1233                 case CT_IMAGE_BMP:
1234                         return "image/bmp";
1235
1236                 case CT_IMAGE_ICNS:
1237                         return "image/icns";
1238
1239                 default:
1240                 case CT_TEXT_PLAIN:
1241                         return "text/plain; charset=utf-8";
1242         }
1243 }
1244
1245
1246 const char *web_response_code_to_string(int code) {
1247         switch(code) {
1248                 case 200:
1249                         return "OK";
1250
1251                 case 307:
1252                         return "Temporary Redirect";
1253
1254                 case 400:
1255                         return "Bad Request";
1256
1257                 case 403:
1258                         return "Forbidden";
1259
1260                 case 404:
1261                         return "Not Found";
1262
1263                 case 412:
1264                         return "Preconditions Failed";
1265
1266                 default:
1267                         if(code >= 100 && code < 200)
1268                                 return "Informational";
1269
1270                         if(code >= 200 && code < 300)
1271                                 return "Successful";
1272
1273                         if(code >= 300 && code < 400)
1274                                 return "Redirection";
1275
1276                         if(code >= 400 && code < 500)
1277                                 return "Bad Request";
1278
1279                         if(code >= 500 && code < 600)
1280                                 return "Server Error";
1281
1282                         return "Undefined Error";
1283         }
1284 }
1285
1286 static inline char *http_header_parse(struct web_client *w, char *s) {
1287         static uint32_t hash_origin = 0, hash_connection = 0, hash_accept_encoding = 0;
1288
1289         if(unlikely(!hash_origin)) {
1290                 hash_origin = simple_uhash("Origin");
1291                 hash_connection = simple_uhash("Connection");
1292                 hash_accept_encoding = simple_uhash("Accept-Encoding");
1293         }
1294
1295         char *e = s;
1296
1297         // find the :
1298         while(*e && *e != ':') e++;
1299         if(!*e || e[1] != ' ') return e;
1300
1301         // get the name
1302         *e = '\0';
1303
1304         // find the value
1305         char *v, *ve;
1306         v = ve = e + 2;
1307
1308         // find the \r
1309         while(*ve && *ve != '\r') ve++;
1310         if(!*ve || ve[1] != '\n') {
1311                 *e = ':';
1312                 return ve;
1313         }
1314
1315         // terminate the value
1316         *ve = '\0';
1317
1318         // fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
1319         uint32_t hash = simple_uhash(s);
1320
1321         if(hash == hash_origin && !strcasecmp(s, "Origin"))
1322                 strncpyz(w->origin, v, ORIGIN_MAX);
1323
1324         else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
1325                 if(strcasestr(v, "keep-alive"))
1326                         w->keepalive = 1;
1327         }
1328 #ifdef NETDATA_WITH_ZLIB
1329         else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
1330                 if(web_enable_gzip) {
1331                         if(strcasestr(v, "gzip"))
1332                                 web_client_enable_deflate(w, 1);
1333                         //
1334                         // does not seem to work
1335                         // else if(strcasestr(v, "deflate"))
1336                         //      web_client_enable_deflate(w, 0);
1337                 }
1338         }
1339 #endif /* NETDATA_WITH_ZLIB */
1340
1341         *e = ':';
1342         *ve = '\r';
1343         return ve;
1344 }
1345
1346 // http_request_validate()
1347 // returns:
1348 // = 0 : all good, process the request
1349 // > 0 : request is not supported
1350 // < 0 : request is incomplete - wait for more data
1351
1352 static inline int http_request_validate(struct web_client *w) {
1353         char *s = w->response.data->buffer, *encoded_url = NULL;
1354
1355         // is is a valid request?
1356         if(!strncmp(s, "GET ", 4)) {
1357                 encoded_url = s = &s[4];
1358                 w->mode = WEB_CLIENT_MODE_NORMAL;
1359         }
1360         else if(!strncmp(s, "OPTIONS ", 8)) {
1361                 encoded_url = s = &s[8];
1362                 w->mode = WEB_CLIENT_MODE_OPTIONS;
1363         }
1364         else {
1365                 w->wait_receive = 0;
1366                 return 1;
1367         }
1368
1369         // find the SPACE + "HTTP/"
1370         while(*s) {
1371                 // find the next space
1372                 while (*s && *s != ' ') s++;
1373
1374                 // is it SPACE + "HTTP/" ?
1375                 if(*s && !strncmp(s, " HTTP/", 6)) break;
1376                 else s++;
1377         }
1378
1379         // incomplete requests
1380         if(unlikely(!*s)) {
1381                 w->wait_receive = 1;
1382                 return -2;
1383         }
1384
1385         // we have the end of encoded_url - remember it
1386         char *ue = s;
1387
1388         // make sure we have complete request
1389         // complete requests contain: \r\n\r\n
1390         while(*s) {
1391                 // find a line feed
1392                 while(*s && *s++ != '\r');
1393
1394                 // did we reach the end?
1395                 if(unlikely(!*s)) break;
1396
1397                 // is it \r\n ?
1398                 if(likely(*s++ == '\n')) {
1399
1400                         // is it again \r\n ? (header end)
1401                         if(unlikely(*s == '\r' && s[1] == '\n')) {
1402                                 // a valid complete HTTP request found
1403
1404                                 *ue = '\0';
1405                                 url_decode_r(w->decoded_url, encoded_url, URL_MAX + 1);
1406                                 *ue = ' ';
1407
1408                                 // copy the URL - we are going to overwrite parts of it
1409                                 // FIXME -- we should avoid it
1410                                 strncpyz(w->last_url, w->decoded_url, URL_MAX);
1411
1412                                 w->wait_receive = 0;
1413                                 return 0;
1414                         }
1415
1416                         // another header line
1417                         s = http_header_parse(w, s);
1418                 }
1419         }
1420
1421         // incomplete request
1422         w->wait_receive = 1;
1423         return -3;
1424 }
1425
1426 void web_client_process(struct web_client *w) {
1427         static uint32_t hash_api = 0, hash_netdata_conf = 0, hash_data = 0, hash_datasource = 0, hash_graph = 0,
1428                         hash_list = 0, hash_all_json = 0, hash_exit = 0, hash_debug = 0, hash_mirror = 0;
1429
1430         if(unlikely(!hash_api)) {
1431                 hash_api = simple_hash("api");
1432                 hash_netdata_conf = simple_hash("netdata.conf");
1433                 hash_data = simple_hash(WEB_PATH_DATA);
1434                 hash_datasource = simple_hash(WEB_PATH_DATASOURCE);
1435                 hash_graph = simple_hash(WEB_PATH_GRAPH);
1436                 hash_list = simple_hash("list");
1437                 hash_all_json = simple_hash("all.json");
1438                 hash_exit = simple_hash("exit");
1439                 hash_debug = simple_hash("debug");
1440                 hash_mirror = simple_hash("mirror");
1441         }
1442
1443         int code = 500;
1444         ssize_t bytes;
1445
1446         int what_to_do = http_request_validate(w);
1447
1448         // wait for more data
1449         if(what_to_do < 0) {
1450                 if(w->response.data->len > TOO_BIG_REQUEST) {
1451                         strcpy(w->last_url, "too big request");
1452
1453                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zd bytes).", w->id, w->response.data->len);
1454
1455                         code = 400;
1456                         buffer_flush(w->response.data);
1457                         buffer_sprintf(w->response.data, "Received request is too big  (%zd bytes).\r\n", w->response.data->len);
1458                 }
1459                 else {
1460                         // wait for more data
1461                         return;
1462                 }
1463         }
1464         else if(what_to_do > 0) {
1465                 strcpy(w->last_url, "not a valid request");
1466
1467                 debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
1468
1469                 code = 500;
1470                 buffer_flush(w->response.data);
1471                 buffer_strcat(w->response.data, "I don't understand you...\r\n");
1472         }
1473         else { // what_to_do == 0
1474                 gettimeofday(&w->tv_in, NULL);
1475
1476                 if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1477                         code = 200;
1478                         w->response.data->contenttype = CT_TEXT_PLAIN;
1479                         buffer_flush(w->response.data);
1480                         buffer_strcat(w->response.data, "OK");
1481                 }
1482                 else {
1483                         char *url = w->decoded_url;
1484                         char *tok = mystrsep(&url, "/?");
1485                         if(tok && *tok) {
1486                                 uint32_t hash = simple_hash(tok);
1487                                 debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
1488
1489                                 if(hash == hash_api && strcmp(tok, "api") == 0) {
1490                                         // the client is requesting api access
1491                                         code = web_client_api_request(w, url);
1492                                 }
1493                                 else if(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0) {
1494                                         code = 200;
1495                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
1496
1497                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1498                                         buffer_flush(w->response.data);
1499                                         generate_config(w->response.data, 0);
1500                                 }
1501                                 else if(hash == hash_data && strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
1502                                         // the client is requesting rrd data -- OLD API
1503                                         code = web_client_api_old_data_request(w, url, DATASOURCE_JSON);
1504                                 }
1505                                 else if(hash == hash_datasource && strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
1506                                         // the client is requesting google datasource -- OLD API
1507                                         code = web_client_api_old_data_request(w, url, DATASOURCE_DATATABLE_JSONP);
1508                                 }
1509                                 else if(hash == hash_graph && strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
1510                                         // the client is requesting an rrd graph -- OLD API
1511
1512                                         // get the name of the data to show
1513                                         tok = mystrsep(&url, "/?&");
1514                                         if(tok && *tok) {
1515                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1516
1517                                                 // do we have such a data set?
1518                                                 RRDSET *st = rrdset_find_byname(tok);
1519                                                 if(!st) st = rrdset_find(tok);
1520                                                 if(!st) {
1521                                                         // we don't have it
1522                                                         // try to send a file with that name
1523                                                         buffer_flush(w->response.data);
1524                                                         code = mysendfile(w, tok);
1525                                                 }
1526                                                 else {
1527                                                         code = 200;
1528                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
1529                                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1530                                                         buffer_flush(w->response.data);
1531                                                         rrd_stats_graph_json(st, url, w->response.data);
1532                                                 }
1533                                         }
1534                                         else {
1535                                                 code = 400;
1536                                                 buffer_flush(w->response.data);
1537                                                 buffer_strcat(w->response.data, "Graph name?\r\n");
1538                                         }
1539                                 }
1540                                 else if(hash == hash_list && strcmp(tok, "list") == 0) {
1541                                         // OLD API
1542                                         code = 200;
1543
1544                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
1545
1546                                         buffer_flush(w->response.data);
1547                                         RRDSET *st = rrdset_root;
1548
1549                                         for ( ; st ; st = st->next )
1550                                                 buffer_sprintf(w->response.data, "%s\n", st->name);
1551                                 }
1552                                 else if(hash == hash_all_json && strcmp(tok, "all.json") == 0) {
1553                                         // OLD API
1554                                         code = 200;
1555                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
1556
1557                                         w->response.data->contenttype = CT_APPLICATION_JSON;
1558                                         buffer_flush(w->response.data);
1559                                         rrd_stats_all_json(w->response.data);
1560                                 }
1561 #ifdef NETDATA_INTERNAL_CHECKS
1562                                 else if(hash == hash_exit && strcmp(tok, "exit") == 0) {
1563                                         code = 200;
1564                                         w->response.data->contenttype = CT_TEXT_PLAIN;
1565                                         buffer_flush(w->response.data);
1566
1567                                         if(!netdata_exit)
1568                                                 buffer_strcat(w->response.data, "ok, will do...");
1569                                         else
1570                                                 buffer_strcat(w->response.data, "I am doing it already");
1571
1572                                         netdata_exit = 1;
1573                                 }
1574                                 else if(hash == hash_debug && strcmp(tok, "debug") == 0) {
1575                                         buffer_flush(w->response.data);
1576
1577                                         // get the name of the data to show
1578                                         tok = mystrsep(&url, "/?&");
1579                                         if(tok && *tok) {
1580                                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
1581
1582                                                 // do we have such a data set?
1583                                                 RRDSET *st = rrdset_find_byname(tok);
1584                                                 if(!st) st = rrdset_find(tok);
1585                                                 if(!st) {
1586                                                         code = 404;
1587                                                         buffer_sprintf(w->response.data, "Chart %s is not found.\r\n", tok);
1588                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
1589                                                 }
1590                                                 else {
1591                                                         code = 200;
1592                                                         debug_flags |= D_RRD_STATS;
1593                                                         st->debug = !st->debug;
1594                                                         buffer_sprintf(w->response.data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
1595                                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
1596                                                 }
1597                                         }
1598                                         else {
1599                                                 code = 500;
1600                                                 buffer_flush(w->response.data);
1601                                                 buffer_strcat(w->response.data, "debug which chart?\r\n");
1602                                         }
1603                                 }
1604                                 else if(hash == hash_mirror && strcmp(tok, "mirror") == 0) {
1605                                         code = 200;
1606
1607                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
1608
1609                                         // replace the zero bytes with spaces
1610                                         buffer_char_replace(w->response.data, '\0', ' ');
1611
1612                                         // just leave the buffer as is
1613                                         // it will be copied back to the client
1614                                 }
1615 #endif  /* NETDATA_INTERNAL_CHECKS */
1616                                 else {
1617                                         char filename[FILENAME_MAX+1];
1618                                         url = filename;
1619                                         strncpyz(filename, w->last_url, FILENAME_MAX);
1620                                         tok = mystrsep(&url, "?");
1621                                         buffer_flush(w->response.data);
1622                                         code = mysendfile(w, (tok && *tok)?tok:"/");
1623                                 }
1624                         }
1625                         else {
1626                                 char filename[FILENAME_MAX+1];
1627                                 url = filename;
1628                                 strncpyz(filename, w->last_url, FILENAME_MAX);
1629                                 tok = mystrsep(&url, "?");
1630                                 buffer_flush(w->response.data);
1631                                 code = mysendfile(w, (tok && *tok)?tok:"/");
1632                         }
1633                 }
1634         }
1635
1636         gettimeofday(&w->tv_ready, NULL);
1637         w->response.data->date = time(NULL);
1638         w->response.sent = 0;
1639         w->response.code = code;
1640
1641         // prepare the HTTP response header
1642         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
1643
1644         const char *content_type_string = web_content_type_to_string(w->response.data->contenttype);
1645         const char *code_msg = web_response_code_to_string(code);
1646
1647         char date[100];
1648         struct tm tmbuf, *tm = gmtime_r(&w->response.data->date, &tmbuf);
1649         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
1650
1651         buffer_sprintf(w->response.header_output,
1652                 "HTTP/1.1 %d %s\r\n"
1653                 "Connection: %s\r\n"
1654                 "Server: NetData Embedded HTTP Server\r\n"
1655                 "Access-Control-Allow-Origin: %s\r\n"
1656                 "Access-Control-Allow-Credentials: true\r\n"
1657                 "Content-Type: %s\r\n"
1658                 "Date: %s\r\n"
1659                 , code, code_msg
1660                 , w->keepalive?"keep-alive":"close"
1661                 , w->origin
1662                 , content_type_string
1663                 , date
1664                 );
1665
1666         if(w->cookie1[0]) {
1667                 buffer_sprintf(w->response.header_output,
1668                    "Set-Cookie: %s\r\n",
1669                    w->cookie1);
1670         }
1671
1672         if(w->cookie2[0]) {
1673                 buffer_sprintf(w->response.header_output,
1674                    "Set-Cookie: %s\r\n",
1675                    w->cookie2);
1676         }
1677
1678         if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
1679                 buffer_strcat(w->response.header_output,
1680                         "Access-Control-Allow-Methods: GET, OPTIONS\r\n"
1681                         "Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie\r\n"
1682                         "Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
1683                         );
1684         }
1685
1686         if(buffer_strlen(w->response.header))
1687                 buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
1688
1689         if(w->mode == WEB_CLIENT_MODE_NORMAL && (w->response.data->options & WB_CONTENT_NO_CACHEABLE)) {
1690                 buffer_sprintf(w->response.header_output,
1691                         "Expires: %s\r\n"
1692                         "Cache-Control: no-cache\r\n"
1693                         , date);
1694         }
1695         else if(w->mode != WEB_CLIENT_MODE_OPTIONS) {
1696                 char edate[100];
1697                 time_t et = w->response.data->date + (86400 * 14);
1698                 struct tm etmbuf, *etm = gmtime_r(&et, &etmbuf);
1699                 strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", etm);
1700
1701                 buffer_sprintf(w->response.header_output,
1702                         "Expires: %s\r\n"
1703                         "Cache-Control: public\r\n"
1704                         , edate);
1705         }
1706
1707         // if we know the content length, put it
1708         if(!w->response.zoutput && (w->response.data->len || w->response.rlen))
1709                 buffer_sprintf(w->response.header_output,
1710                         "Content-Length: %ld\r\n"
1711                         , w->response.data->len? w->response.data->len: w->response.rlen
1712                         );
1713         else if(!w->response.zoutput)
1714                 w->keepalive = 0;       // content-length is required for keep-alive
1715
1716         if(w->response.zoutput) {
1717                 buffer_strcat(w->response.header_output,
1718                         "Content-Encoding: gzip\r\n"
1719                         "Transfer-Encoding: chunked\r\n"
1720                         );
1721         }
1722
1723         buffer_strcat(w->response.header_output, "\r\n");
1724
1725 /*      // disable TCP_NODELAY, to buffer the header
1726         int flag = 0;
1727         if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0)
1728                 error("%llu: failed to disable TCP_NODELAY on socket.", w->id);
1729 */
1730         // sent the HTTP header
1731         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'"
1732                         , w->id
1733                         , buffer_strlen(w->response.header_output)
1734                         , buffer_tostring(w->response.header_output)
1735                         );
1736
1737         bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0);
1738         if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
1739                 if(bytes > 0)
1740                         w->stats_sent_bytes += bytes;
1741
1742                 error("%llu: HTTP Header failed to be sent (I sent %d bytes but the system sent %d bytes). Closing web client.", w->id,
1743                           buffer_strlen(w->response.header_output), bytes);
1744
1745                 WEB_CLIENT_IS_DEAD(w);
1746                 return;
1747         }
1748         else
1749                 w->stats_sent_bytes += bytes;
1750
1751 /*      // enable TCP_NODELAY, to send all data immediately at the next send()
1752         flag = 1;
1753         if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
1754 */
1755         // enable sending immediately if we have data
1756         if(w->response.data->len) w->wait_send = 1;
1757         else w->wait_send = 0;
1758
1759         // pretty logging
1760         switch(w->mode) {
1761                 case WEB_CLIENT_MODE_OPTIONS:
1762                         debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
1763                         break;
1764
1765                 case WEB_CLIENT_MODE_NORMAL:
1766                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->response.data->len);
1767                         break;
1768
1769                 case WEB_CLIENT_MODE_FILECOPY:
1770                         if(w->response.rlen) {
1771                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->response.rlen);
1772                                 w->wait_receive = 1;
1773
1774                                 /*
1775                                 // utilize the kernel sendfile() for copying the file to the socket.
1776                                 // this block of code can be commented, without anything missing.
1777                                 // when it is commented, the program will copy the data using async I/O.
1778                                 {
1779                                         long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
1780                                         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);
1781                                         else web_client_reset(w);
1782                                 }
1783                                 */
1784                         }
1785                         else
1786                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
1787                         break;
1788
1789                 default:
1790                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
1791                         break;
1792         }
1793 }
1794
1795 ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
1796 {
1797         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
1798         char buf[1024];
1799         sprintf(buf, "%lX\r\n", len);
1800
1801         ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
1802         if(bytes > 0) {
1803                 debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
1804                 w->stats_sent_bytes += bytes;
1805         }
1806
1807         else if(bytes == 0) {
1808                 error("%llu: Did not send chunk header to the client.", w->id);
1809                 WEB_CLIENT_IS_DEAD(w);
1810         }
1811         else {
1812                 error("%llu: Failed to send chunk header to client.", w->id);
1813                 WEB_CLIENT_IS_DEAD(w);
1814         }
1815
1816         return bytes;
1817 }
1818
1819 ssize_t web_client_send_chunk_close(struct web_client *w)
1820 {
1821         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
1822
1823         ssize_t bytes = send(w->ofd, "\r\n", 2, 0);
1824         if(bytes > 0) {
1825                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
1826                 w->stats_sent_bytes += bytes;
1827         }
1828
1829         else if(bytes == 0) {
1830                 error("%llu: Did not send chunk suffix to the client.", w->id);
1831                 WEB_CLIENT_IS_DEAD(w);
1832         }
1833         else {
1834                 error("%llu: Failed to send chunk suffix to client.", w->id);
1835                 WEB_CLIENT_IS_DEAD(w);
1836         }
1837
1838         return bytes;
1839 }
1840
1841 ssize_t web_client_send_chunk_finalize(struct web_client *w)
1842 {
1843         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
1844
1845         ssize_t bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
1846         if(bytes > 0) {
1847                 debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
1848                 w->stats_sent_bytes += bytes;
1849         }
1850
1851         else if(bytes == 0) {
1852                 error("%llu: Did not send chunk suffix to the client.", w->id);
1853                 WEB_CLIENT_IS_DEAD(w);
1854         }
1855         else {
1856                 error("%llu: Failed to send chunk suffix to client.", w->id);
1857                 WEB_CLIENT_IS_DEAD(w);
1858         }
1859
1860         return bytes;
1861 }
1862
1863 #ifdef NETDATA_WITH_ZLIB
1864 ssize_t web_client_send_deflate(struct web_client *w)
1865 {
1866         ssize_t len = 0, t = 0;
1867
1868         // when using compression,
1869         // w->response.sent is the amount of bytes passed through compression
1870
1871         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);
1872
1873         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) {
1874                 // there is nothing to send
1875
1876                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1877
1878                 // finalize the chunk
1879                 if(w->response.sent != 0) {
1880                         t = web_client_send_chunk_finalize(w);
1881                         if(t < 0) return t;
1882                 }
1883
1884                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
1885                         // we have to wait, more data will come
1886                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1887                         w->wait_send = 0;
1888                         return t;
1889                 }
1890
1891                 if(unlikely(!w->keepalive)) {
1892                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
1893                         WEB_CLIENT_IS_DEAD(w);
1894                         return t;
1895                 }
1896
1897                 // reset the client
1898                 web_client_reset(w);
1899                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
1900                 return t;
1901         }
1902
1903         if(w->response.zhave == w->response.zsent) {
1904                 // compress more input data
1905
1906                 // close the previous open chunk
1907                 if(w->response.sent != 0) {
1908                         t = web_client_send_chunk_close(w);
1909                         if(t < 0) return t;
1910                 }
1911
1912                 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);
1913
1914                 // give the compressor all the data not passed through the compressor yet
1915                 if(w->response.data->len > w->response.sent) {
1916                         w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
1917                         w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
1918                 }
1919
1920                 // reset the compressor output buffer
1921                 w->response.zstream.next_out = w->response.zbuffer;
1922                 w->response.zstream.avail_out = ZLIB_CHUNK;
1923
1924                 // ask for FINISH if we have all the input
1925                 int flush = Z_SYNC_FLUSH;
1926                 if(w->mode == WEB_CLIENT_MODE_NORMAL
1927                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && !w->wait_receive && w->response.data->len == w->response.rlen)) {
1928                         flush = Z_FINISH;
1929                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
1930                 }
1931                 else {
1932                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
1933                 }
1934
1935                 // compress
1936                 if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
1937                         error("%llu: Compression failed. Closing down client.", w->id);
1938                         web_client_reset(w);
1939                         return(-1);
1940                 }
1941
1942                 w->response.zhave = ZLIB_CHUNK - w->response.zstream.avail_out;
1943                 w->response.zsent = 0;
1944
1945                 // keep track of the bytes passed through the compressor
1946                 w->response.sent = w->response.data->len;
1947
1948                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->response.zhave);
1949
1950                 // open a new chunk
1951                 ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
1952                 if(t2 < 0) return t2;
1953                 t += t2;
1954         }
1955
1956         debug(D_WEB_CLIENT, "%llu: Sending %d bytes of data (+%d of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
1957
1958         len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
1959         if(len > 0) {
1960                 w->stats_sent_bytes += len;
1961                 w->response.zsent += len;
1962                 len += t;
1963                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, len);
1964         }
1965         else if(len == 0) {
1966                 error("%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);
1967                 WEB_CLIENT_IS_DEAD(w);
1968         }
1969         else {
1970                 error("%llu: Failed to send data to client.", w->id);
1971                 WEB_CLIENT_IS_DEAD(w);
1972         }
1973
1974         return(len);
1975 }
1976 #endif // NETDATA_WITH_ZLIB
1977
1978 ssize_t web_client_send(struct web_client *w) {
1979 #ifdef NETDATA_WITH_ZLIB
1980         if(likely(w->response.zoutput)) return web_client_send_deflate(w);
1981 #endif // NETDATA_WITH_ZLIB
1982
1983         ssize_t bytes;
1984
1985         if(unlikely(w->response.data->len - w->response.sent == 0)) {
1986                 // there is nothing to send
1987
1988                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1989
1990                 // there can be two cases for this
1991                 // A. we have done everything
1992                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
1993
1994                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->response.rlen && w->response.rlen > w->response.data->len) {
1995                         // we have to wait, more data will come
1996                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1997                         w->wait_send = 0;
1998                         return 0;
1999                 }
2000
2001                 if(unlikely(!w->keepalive)) {
2002                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->response.sent);
2003                         WEB_CLIENT_IS_DEAD(w);
2004                         return 0;
2005                 }
2006
2007                 web_client_reset(w);
2008                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
2009                 return 0;
2010         }
2011
2012         bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
2013         if(likely(bytes > 0)) {
2014                 w->stats_sent_bytes += bytes;
2015                 w->response.sent += bytes;
2016                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
2017         }
2018         else if(likely(bytes == 0)) {
2019                 error("%llu: Did not send any bytes to the client.", w->id);
2020                 WEB_CLIENT_IS_DEAD(w);
2021         }
2022         else {
2023                 error("%llu: Failed to send data to client.", w->id);
2024                 WEB_CLIENT_IS_DEAD(w);
2025         }
2026
2027         return(bytes);
2028 }
2029
2030 ssize_t web_client_receive(struct web_client *w)
2031 {
2032         // do we have any space for more data?
2033         buffer_need_bytes(w->response.data, WEB_REQUEST_LENGTH);
2034
2035         ssize_t left = w->response.data->size - w->response.data->len;
2036         ssize_t bytes;
2037
2038         if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
2039                 bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
2040         else
2041                 bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
2042
2043         if(likely(bytes > 0)) {
2044                 if(w->mode != WEB_CLIENT_MODE_FILECOPY)
2045                         w->stats_received_bytes += bytes;
2046
2047                 size_t old = w->response.data->len;
2048                 w->response.data->len += bytes;
2049                 w->response.data->buffer[w->response.data->len] = '\0';
2050
2051                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
2052                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
2053
2054                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2055                         w->wait_send = 1;
2056
2057                         if(w->response.rlen && w->response.data->len >= w->response.rlen)
2058                                 w->wait_receive = 0;
2059                 }
2060         }
2061         else if(likely(bytes == 0)) {
2062                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
2063
2064                 // if we cannot read, it means we have an error on input.
2065                 // if however, we are copying a file from ifd to ofd, we should not return an error.
2066                 // in this case, the error should be generated when the file has been sent to the client.
2067
2068                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
2069                         // we are copying data from ifd to ofd
2070                         // let it finish copying...
2071                         w->wait_receive = 0;
2072
2073                         debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
2074                         if(w->ifd != w->ofd) close(w->ifd);
2075                         w->ifd = w->ofd;
2076                 }
2077                 else {
2078                         error("%llu: failed to receive data.", w->id);
2079                         WEB_CLIENT_IS_DEAD(w);
2080                 }
2081         }
2082         else {
2083                 error("%llu: receive data failed.", w->id);
2084                 WEB_CLIENT_IS_DEAD(w);
2085         }
2086
2087         return(bytes);
2088 }
2089
2090
2091 // --------------------------------------------------------------------------------------
2092 // the thread of a single client
2093
2094 // 1. waits for input and output, using async I/O
2095 // 2. it processes HTTP requests
2096 // 3. it generates HTTP responses
2097 // 4. it copies data from input to output if mode is FILECOPY
2098
2099 void *web_client_main(void *ptr)
2100 {
2101         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
2102                 error("Cannot set pthread cancel type to DEFERRED.");
2103
2104         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
2105                 error("Cannot set pthread cancel state to ENABLE.");
2106
2107         struct web_client *w = ptr;
2108         struct pollfd fds[2], *ifd, *ofd;
2109         int retval, fdmax = 0, timeout;
2110
2111         log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2112
2113         for(;;) {
2114                 if(unlikely(w->dead)) {
2115                         error("%llu: client is dead.", w->id);
2116                         break;
2117                 }
2118                 else if(unlikely(!w->wait_receive && !w->wait_send)) {
2119                         error("%llu: client is not set for neither receiving nor sending data.");
2120                         break;
2121                 }
2122
2123                 if(unlikely(w->ifd < 0 || w->ofd < 0)) {
2124                         error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd", w->id, w->ifd, w->ofd);
2125                         break;
2126                 }
2127
2128                 if(w->ifd == w->ofd) {
2129                         fds[0].fd = w->ifd;
2130                         fds[0].events = 0;
2131                         fds[0].revents = 0;
2132
2133                         if(w->wait_receive) fds[0].events += POLLIN;
2134                         if(w->wait_send)    fds[0].events += POLLOUT;
2135
2136                         fds[1].fd = -1;
2137                         fds[1].events = 0;
2138                         fds[1].revents = 0;
2139
2140                         ifd = ofd = &fds[0];
2141
2142                         fdmax = 1;
2143                 }
2144                 else {
2145                         fds[0].fd = w->ifd;
2146                         fds[0].events = 0;
2147                         fds[0].revents = 0;
2148                         if(w->wait_receive) fds[0].events += POLLIN;
2149                         ifd = &fds[0];
2150
2151                         fds[1].fd = w->ofd;
2152                         fds[1].events = 0;
2153                         fds[1].revents = 0;
2154                         if(w->wait_send)    fds[1].events += POLLOUT;
2155                         ofd = &fds[1];
2156
2157                         fdmax = 2;
2158                 }
2159
2160                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2161                 errno = 0;
2162                 timeout = web_client_timeout * 1000;
2163                 retval = poll(fds, fdmax, timeout);
2164
2165                 if(unlikely(retval == -1)) {
2166                         if(errno == EAGAIN || errno == EINTR) {
2167                                 debug(D_WEB_CLIENT, "%llu: EAGAIN received.", w->id);
2168                                 continue;
2169                         }
2170
2171                         error("%llu: LISTENER: poll() failed (input fd = %d, output fd = %d). Closing client.", w->id, w->ifd, w->ofd);
2172                         break;
2173                 }
2174                 else if(unlikely(!retval)) {
2175                         debug(D_WEB_CLIENT, "%llu: Timeout while waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
2176                         break;
2177                 }
2178
2179                 int used = 0;
2180                 if(w->wait_send && ofd->revents & POLLOUT) {
2181                         used++;
2182                         if(web_client_send(w) < 0) {
2183                                 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);
2184                                 break;
2185                         }
2186                 }
2187
2188                 if(w->wait_receive && (ifd->revents & POLLIN || ifd->revents & POLLPRI)) {
2189                         used++;
2190                         if(web_client_receive(w) < 0) {
2191                                 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client.", w->id);
2192                                 break;
2193                         }
2194
2195                         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
2196                                 debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
2197                                 web_client_process(w);
2198                         }
2199                 }
2200
2201                 if(unlikely(!used)) {
2202                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on socket.", w->id);
2203                         break;
2204                 }
2205         }
2206
2207         log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
2208         debug(D_WEB_CLIENT, "%llu: done...", w->id);
2209
2210         // close the sockets/files now
2211         // to free file descriptors
2212         if(w->ifd == w->ofd) {
2213                 if(w->ifd != -1) close(w->ifd);
2214         }
2215         else {
2216                 if(w->ifd != -1) close(w->ifd);
2217                 if(w->ofd != -1) close(w->ofd);
2218         }
2219         w->ifd = -1;
2220         w->ofd = -1;
2221
2222         w->obsolete = 1;
2223
2224         pthread_exit(NULL);
2225         return NULL;
2226 }