src/web_client.c

   1 // enable strcasestr()
   2 #define _GNU_SOURCE
   3
   4 #include <stdlib.h>
   5 #include <sys/types.h>
   6 #include <sys/socket.h>
   7 #include <netinet/in.h>
   8 #include <arpa/inet.h>
   9 #include <errno.h>
  10 #include <pthread.h>
  11 #include <sys/stat.h>
  12 #include <fcntl.h>
  13 #include <netinet/tcp.h>
  14 #include <malloc.h>
  15
  16 #include "common.h"
  17 #include "log.h"
  18 #include "config.h"
  19 #include "url.h"
  20 #include "web_buffer.h"
  21 #include "web_server.h"
  22 #include "global_statistics.h"
  23 #include "rrd.h"
  24 #include "rrd2json.h"
  25
  26 #include "web_client.h"
  27
  28 #define INITIAL_WEB_DATA_LENGTH 65536
  29
  30 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
  31
  32
  33 struct web_client *web_clients = NULL;
  34 unsigned long long web_clients_count = 0;
  35
  36 struct web_client *web_client_create(int listener)
  37 {
  38         struct web_client *w;
  39
  40         w = calloc(1, sizeof(struct web_client));
  41         if(!w) {
  42                 error("Cannot allocate new web_client memory.");
  43                 return NULL;
  44         }
  45
  46         w->id = ++web_clients_count;
  47         w->mode = WEB_CLIENT_MODE_NORMAL;
  48
  49         {
  50                 struct sockaddr *sadr;
  51                 socklen_t addrlen;
  52
  53                 sadr = (struct sockaddr*) &w->clientaddr;
  54                 addrlen = sizeof(w->clientaddr);
  55
  56                 w->ifd = accept(listener, sadr, &addrlen);
  57                 if (w->ifd == -1) {
  58                         error("%llu: Cannot accept new incoming connection.", w->id);
  59                         free(w);
  60                         return NULL;
  61                 }
  62                 w->ofd = w->ifd;
  63
  64                 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
  65                         error("Cannot getnameinfo() on received client connection.");
  66                         strncpy(w->client_ip,   "UNKNOWN", NI_MAXHOST);
  67                         strncpy(w->client_port, "UNKNOWN", NI_MAXSERV);
  68                 }
  69                 w->client_ip[NI_MAXHOST]   = '\0';
  70                 w->client_port[NI_MAXSERV] = '\0';
  71
  72                 switch(sadr->sa_family) {
  73                 case AF_INET:
  74                         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);
  75                         break;
  76                 case AF_INET6:
  77                         if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
  78                                 strcpy(w->client_ip, &w->client_ip[7]);
  79                                 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);
  80                         }
  81                         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);
  82                         break;
  83                 default:
  84                         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);
  85                         break;
  86                 }
  87
  88                 int flag = 1;
  89                 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0) error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
  90         }
  91
  92         w->data = web_buffer_create(INITIAL_WEB_DATA_LENGTH);
  93         if(!w->data) {
  94                 close(w->ifd);
  95                 free(w);
  96                 return NULL;
  97         }
  98
  99         w->wait_receive = 1;
 100
 101         if(web_clients) web_clients->prev = w;
 102         w->next = web_clients;
 103         web_clients = w;
 104
 105         global_statistics.connected_clients++;
 106
 107         return(w);
 108 }
 109
 110 struct web_client *web_client_free(struct web_client *w)
 111 {
 112         struct web_client *n = w->next;
 113
 114         debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
 115
 116         if(w->prev)     w->prev->next = w->next;
 117         if(w->next) w->next->prev = w->prev;
 118
 119         if(w == web_clients) web_clients = w->next;
 120
 121         if(w->data) web_buffer_free(w->data);
 122         close(w->ifd);
 123         if(w->ofd != w->ifd) close(w->ofd);
 124         free(w);
 125
 126         global_statistics.connected_clients--;
 127
 128         return(n);
 129 }
 130
 131 int mysendfile(struct web_client *w, char *filename)
 132 {
 133         static char *web_dir = NULL;
 134         if(!web_dir) web_dir = config_get("global", "web files directory", "web");
 135
 136         debug(D_WEB_CLIENT, "%llu: Looking for file '%s'...", w->id, filename);
 137
 138         // skip leading slashes
 139         while (*filename == '/') filename++;
 140
 141         // if the filename contain known paths, skip them
 142                  if(strncmp(filename, WEB_PATH_DATA       "/", strlen(WEB_PATH_DATA)       + 1) == 0) filename = &filename[strlen(WEB_PATH_DATA)       + 1];
 143         else if(strncmp(filename, WEB_PATH_DATASOURCE "/", strlen(WEB_PATH_DATASOURCE) + 1) == 0) filename = &filename[strlen(WEB_PATH_DATASOURCE) + 1];
 144         else if(strncmp(filename, WEB_PATH_GRAPH      "/", strlen(WEB_PATH_GRAPH)      + 1) == 0) filename = &filename[strlen(WEB_PATH_GRAPH)      + 1];
 145         else if(strncmp(filename, WEB_PATH_FILE       "/", strlen(WEB_PATH_FILE)       + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE)       + 1];
 146
 147         // if the filename contains a / or a .., refuse to serve it
 148         if(strchr(filename, '/') != 0 || strstr(filename, "..") != 0) {
 149                 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
 150                 web_buffer_printf(w->data, "File '%s' cannot be served. Filenames cannot contain / or ..", filename);
 151                 return 400;
 152         }
 153
 154         // access the file
 155         char webfilename[FILENAME_MAX + 1];
 156         snprintf(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
 157
 158         // check if the file exists
 159         struct stat stat;
 160         if(lstat(webfilename, &stat) != 0) {
 161                 error("%llu: File '%s' is not found.", w->id, webfilename);
 162                 web_buffer_printf(w->data, "File '%s' does not exist, or is not accessible.", filename);
 163                 return 404;
 164         }
 165
 166         // check if the file is owned by us
 167         if(stat.st_uid != getuid() && stat.st_uid != geteuid()) {
 168                 error("%llu: File '%s' is owned by user %d (I run as user %d). Access Denied.", w->id, webfilename, stat.st_uid, getuid());
 169                 web_buffer_printf(w->data, "Access to file '%s' is not permitted.", filename);
 170                 return 403;
 171         }
 172
 173         // open the file
 174         w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
 175         if(w->ifd == -1) {
 176                 w->ifd = w->ofd;
 177
 178                 if(errno == EBUSY || errno == EAGAIN) {
 179                         error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
 180                         snprintf(w->response_header, MAX_HTTP_HEADER_SIZE, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
 181                         web_buffer_printf(w->data, "The file '%s' is currently busy. Please try again later.", filename);
 182                         return 307;
 183                 }
 184                 else {
 185                         error("%llu: Cannot open file '%s'.", w->id, webfilename);
 186                         web_buffer_printf(w->data, "Cannot open file '%s'.", filename);
 187                         return 404;
 188                 }
 189         }
 190
 191         // pick a Content-Type for the file
 192                  if(strstr(filename, ".html") != NULL)  w->data->contenttype = CT_TEXT_HTML;
 193         else if(strstr(filename, ".js")   != NULL)      w->data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 194         else if(strstr(filename, ".css")  != NULL)      w->data->contenttype = CT_TEXT_CSS;
 195         else if(strstr(filename, ".xml")  != NULL)      w->data->contenttype = CT_TEXT_XML;
 196         else if(strstr(filename, ".xsl")  != NULL)      w->data->contenttype = CT_TEXT_XSL;
 197         else if(strstr(filename, ".txt")  != NULL)  w->data->contenttype = CT_TEXT_PLAIN;
 198         else if(strstr(filename, ".svg")  != NULL)  w->data->contenttype = CT_IMAGE_SVG_XML;
 199         else if(strstr(filename, ".ttf")  != NULL)  w->data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
 200         else if(strstr(filename, ".otf")  != NULL)  w->data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
 201         else if(strstr(filename, ".woff") != NULL)  w->data->contenttype = CT_APPLICATION_FONT_WOFF;
 202         else if(strstr(filename, ".eot")  != NULL)  w->data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
 203         else w->data->contenttype = CT_APPLICATION_OCTET_STREAM;
 204
 205         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);
 206
 207         w->mode = WEB_CLIENT_MODE_FILECOPY;
 208         w->wait_receive = 1;
 209         w->wait_send = 0;
 210         w->data->bytes = 0;
 211         w->data->buffer[0] = '\0';
 212         w->data->rbytes = stat.st_size;
 213         w->data->date = stat.st_mtim.tv_sec;
 214
 215         return 200;
 216 }
 217
 218 void web_client_reset(struct web_client *w)
 219 {
 220         struct timeval tv;
 221         gettimeofday(&tv, NULL);
 222
 223         long sent = w->zoutput?(long)w->zstream.total_out:((w->mode == WEB_CLIENT_MODE_FILECOPY)?w->data->rbytes:w->data->bytes);
 224         long size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->data->rbytes:w->data->bytes;
 225
 226         if(w->last_url[0]) log_access("%llu: (sent/all = %ld/%ld bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: '%s'",
 227                 w->id,
 228                 sent, size, -((size>0)?((float)(size-sent)/(float)size * 100.0):0.0),
 229                 (float)usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
 230                 (float)usecdiff(&tv, &w->tv_ready) / 1000.0,
 231                 (float)usecdiff(&tv, &w->tv_in) / 1000.0,
 232                 (w->mode == WEB_CLIENT_MODE_FILECOPY)?"filecopy":"data",
 233                 w->last_url
 234                 );
 235
 236         debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
 237
 238         if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
 239                 debug(D_WEB_CLIENT, "%llu: Closing filecopy input file.", w->id);
 240                 close(w->ifd);
 241                 w->ifd = w->ofd;
 242         }
 243
 244         w->last_url[0] = '\0';
 245
 246         w->data->contenttype = CT_TEXT_PLAIN;
 247         w->mode = WEB_CLIENT_MODE_NORMAL;
 248
 249         w->data->rbytes = 0;
 250         w->data->bytes = 0;
 251         w->data->sent = 0;
 252
 253         w->response_header[0] = '\0';
 254         w->data->buffer[0] = '\0';
 255
 256         w->wait_receive = 1;
 257         w->wait_send = 0;
 258
 259         // if we had enabled compression, release it
 260         if(w->zinitialized) {
 261                 debug(D_DEFLATE, "%llu: Reseting compression.", w->id);
 262                 deflateEnd(&w->zstream);
 263                 w->zoutput = 0;
 264                 w->zsent = 0;
 265                 w->zhave = 0;
 266                 w->zstream.avail_in = 0;
 267                 w->zstream.avail_out = 0;
 268                 w->zstream.total_in = 0;
 269                 w->zstream.total_out = 0;
 270                 w->zinitialized = 0;
 271         }
 272 }
 273
 274 void web_client_enable_deflate(struct web_client *w) {
 275         if(w->zinitialized == 1) {
 276                 error("%llu: Compression has already be initialized for this client.", w->id);
 277                 return;
 278         }
 279
 280         if(w->data->sent) {
 281                 error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
 282                 return;
 283         }
 284
 285         w->zstream.zalloc = Z_NULL;
 286         w->zstream.zfree = Z_NULL;
 287         w->zstream.opaque = Z_NULL;
 288
 289         w->zstream.next_in = (Bytef *)w->data->buffer;
 290         w->zstream.avail_in = 0;
 291         w->zstream.total_in = 0;
 292
 293         w->zstream.next_out = w->zbuffer;
 294         w->zstream.avail_out = 0;
 295         w->zstream.total_out = 0;
 296
 297         w->zstream.zalloc = Z_NULL;
 298         w->zstream.zfree = Z_NULL;
 299         w->zstream.opaque = Z_NULL;
 300
 301 //      if(deflateInit(&w->zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 302 //              error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 303 //              return;
 304 //      }
 305
 306         // Select GZIP compression: windowbits = 15 + 16 = 31
 307         if(deflateInit2(&w->zstream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
 308                 error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
 309                 return;
 310         }
 311
 312         w->zsent = 0;
 313         w->zoutput = 1;
 314         w->zinitialized = 1;
 315
 316         debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
 317 }
 318
 319 int web_client_data_request(struct web_client *w, char *url, int datasource_type)
 320 {
 321         char *args = strchr(url, '?');
 322         if(args) {
 323                 *args='\0';
 324                 args = &args[1];
 325         }
 326
 327         // get the name of the data to show
 328         char *tok = mystrsep(&url, "/");
 329         debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
 330
 331         // do we have such a data set?
 332         RRDSET *st = rrdset_find_byname(tok);
 333         if(!st) st = rrdset_find(tok);
 334         if(!st) {
 335                 // we don't have it
 336                 // try to send a file with that name
 337                 w->data->bytes = 0;
 338                 return(mysendfile(w, tok));
 339         }
 340
 341         // we have it
 342         debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
 343
 344         // how many entries does the client want?
 345         long lines = rrd_default_history_entries;
 346         long group_count = 1;
 347         time_t after = 0, before = 0;
 348         int group_method = GROUP_AVERAGE;
 349         int nonzero = 0;
 350
 351         if(url) {
 352                 // parse the lines required
 353                 tok = mystrsep(&url, "/");
 354                 if(tok) lines = atoi(tok);
 355                 if(lines < 1) lines = 1;
 356         }
 357         if(url) {
 358                 // parse the group count required
 359                 tok = mystrsep(&url, "/");
 360                 if(tok) group_count = atoi(tok);
 361                 if(group_count < 1) group_count = 1;
 362                 //if(group_count > save_history / 20) group_count = save_history / 20;
 363         }
 364         if(url) {
 365                 // parse the grouping method required
 366                 tok = mystrsep(&url, "/");
 367                 if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
 368                 else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
 369                 else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
 370                 else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
 371         }
 372         if(url) {
 373                 // parse after time
 374                 tok = mystrsep(&url, "/");
 375                 if(tok) after = strtoul(tok, NULL, 10);
 376                 if(after < 0) after = 0;
 377         }
 378         if(url) {
 379                 // parse before time
 380                 tok = mystrsep(&url, "/");
 381                 if(tok) before = strtoul(tok, NULL, 10);
 382                 if(before < 0) before = 0;
 383         }
 384         if(url) {
 385                 // parse nonzero
 386                 tok = mystrsep(&url, "/");
 387                 if(tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
 388         }
 389
 390         w->data->contenttype = CT_APPLICATION_JSON;
 391         w->data->bytes = 0;
 392
 393         char *google_version = "0.6";
 394         char *google_reqId = "0";
 395         char *google_sig = "0";
 396         char *google_out = "json";
 397         char *google_responseHandler = "google.visualization.Query.setResponse";
 398         char *google_outFileName = NULL;
 399         unsigned long last_timestamp_in_data = 0;
 400         if(datasource_type == DATASOURCE_GOOGLE_JSON || datasource_type == DATASOURCE_GOOGLE_JSONP) {
 401
 402                 w->data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
 403
 404                 while(args) {
 405                         tok = mystrsep(&args, "&");
 406                         if(tok) {
 407                                 char *name = mystrsep(&tok, "=");
 408                                 if(name && strcmp(name, "tqx") == 0) {
 409                                         char *key = mystrsep(&tok, ":");
 410                                         char *value = mystrsep(&tok, ";");
 411                                         if(key && value && *key && *value) {
 412                                                 if(strcmp(key, "version") == 0)
 413                                                         google_version = value;
 414
 415                                                 else if(strcmp(key, "reqId") == 0)
 416                                                         google_reqId = value;
 417
 418                                                 else if(strcmp(key, "sig") == 0)
 419                                                         google_sig = value;
 420
 421                                                 else if(strcmp(key, "out") == 0)
 422                                                         google_out = value;
 423
 424                                                 else if(strcmp(key, "responseHandler") == 0)
 425                                                         google_responseHandler = value;
 426
 427                                                 else if(strcmp(key, "outFileName") == 0)
 428                                                         google_outFileName = value;
 429                                         }
 430                                 }
 431                         }
 432                 }
 433
 434                 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
 435                         w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
 436                         );
 437
 438                 if(datasource_type == DATASOURCE_GOOGLE_JSONP) {
 439                         last_timestamp_in_data = strtoul(google_sig, NULL, 0);
 440
 441                         // check the client wants json
 442                         if(strcmp(google_out, "json") != 0) {
 443                                 w->data->bytes = snprintf(w->data->buffer, w->data->size,
 444                                         "%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.'}]});",
 445                                         google_responseHandler, google_version, google_reqId, google_out);
 446                                         return 200;
 447                         }
 448                 }
 449         }
 450
 451         if(datasource_type == DATASOURCE_GOOGLE_JSONP) {
 452                 w->data->bytes = snprintf(w->data->buffer, w->data->size,
 453                         "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
 454                         google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
 455         }
 456
 457         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);
 458         unsigned long timestamp_in_data = rrd_stats_json(datasource_type, st, w->data, lines, group_count, group_method, after, before, nonzero);
 459
 460         if(datasource_type == DATASOURCE_GOOGLE_JSONP) {
 461                 if(timestamp_in_data > last_timestamp_in_data)
 462                         w->data->bytes += snprintf(&w->data->buffer[w->data->bytes], w->data->size - w->data->bytes, "});");
 463
 464                 else {
 465                         // the client already has the latest data
 466                         w->data->bytes = snprintf(w->data->buffer, w->data->size,
 467                                 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
 468                                 google_responseHandler, google_version, google_reqId);
 469                 }
 470         }
 471
 472         return 200;
 473 }
 474
 475 /*
 476 int web_client_parse_request(struct web_client *w) {
 477         // protocol
 478         // hostname
 479         // path
 480         // query string name-value
 481         // http version
 482         // method
 483         // http request headers name-value
 484
 485         web_client_clean_request(w);
 486
 487         debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->data->bytes, w->data->buffer);
 488
 489         char *buf = w->data->buffer;
 490         char *line, *tok;
 491
 492         // ------------------------------------------------------------------------
 493         // the first line
 494
 495         if(buf && (line = strsep(&buf, "\r\n"))) {
 496                 // method
 497                 if(line && (tok = strsep(&line, " "))) {
 498                         w->request.protocol = strdup(tok);
 499                 }
 500                 else goto cleanup;
 501
 502                 // url
 503         }
 504         else goto cleanup;
 505
 506         // ------------------------------------------------------------------------
 507         // the rest of the lines
 508
 509         while(buf && (line = strsep(&buf, "\r\n"))) {
 510                 while(line && (tok = strsep(&line, ": "))) {
 511                 }
 512         }
 513
 514         char *url = NULL;
 515
 516
 517 cleanup:
 518         web_client_clean_request(w);
 519         return 0;
 520 }
 521 */
 522
 523 void web_client_process(struct web_client *w) {
 524         int code = 500;
 525         int bytes;
 526
 527         w->wait_receive = 0;
 528
 529         // check if we have an empty line (end of HTTP header)
 530         if(strstr(w->data->buffer, "\r\n\r\n")) {
 531                 global_statistics_lock();
 532                 global_statistics.web_requests++;
 533                 global_statistics_unlock();
 534
 535                 gettimeofday(&w->tv_in, NULL);
 536                 debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->data->bytes, w->data->buffer);
 537
 538                 // check if the client requested keep-alive HTTP
 539                 if(strcasestr(w->data->buffer, "Connection: keep-alive")) w->keepalive = 1;
 540                 else w->keepalive = 0;
 541
 542                 // check if the client accepts deflate
 543                 if(strstr(w->data->buffer, "gzip"))
 544                         web_client_enable_deflate(w);
 545
 546                 int datasource_type = DATASOURCE_GOOGLE_JSONP;
 547                 //if(strstr(w->data->buffer, "X-DataSource-Auth"))
 548                 //      datasource_type = DATASOURCE_GOOGLE_JSON;
 549
 550                 char *buf = w->data->buffer;
 551                 char *tok = strsep(&buf, " \r\n");
 552                 char *url = NULL;
 553                 char *pointer_to_free = NULL; // keep url_decode() allocated buffer
 554
 555                 if(buf && strcmp(tok, "GET") == 0) {
 556                         tok = strsep(&buf, " \r\n");
 557                         pointer_to_free = url = url_decode(tok);
 558                         debug(D_WEB_CLIENT, "%llu: Processing HTTP GET on url '%s'.", w->id, url);
 559                 }
 560                 else if (buf && strcmp(tok, "POST") == 0) {
 561                         w->keepalive = 0;
 562                         tok = strsep(&buf, " \r\n");
 563                         pointer_to_free = url = url_decode(tok);
 564
 565                         debug(D_WEB_CLIENT, "%llu: I don't know how to handle POST with form data. Assuming it is a GET on url '%s'.", w->id, url);
 566                 }
 567
 568                 w->last_url[0] = '\0';
 569                 if(url) {
 570                         strncpy(w->last_url, url, URL_MAX);
 571                         w->last_url[URL_MAX] = '\0';
 572
 573                         tok = mystrsep(&url, "/?&");
 574
 575                         debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
 576
 577                         if(strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
 578                                 // the client is requesting rrd data
 579                                 datasource_type = DATASOURCE_JSON;
 580                                 code = web_client_data_request(w, url, datasource_type);
 581                         }
 582                         else if(strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
 583                                 // the client is requesting google datasource
 584                                 code = web_client_data_request(w, url, datasource_type);
 585                         }
 586                         else if(strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
 587                                 // the client is requesting an rrd graph
 588
 589                                 // get the name of the data to show
 590                                 tok = mystrsep(&url, "/?&");
 591                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
 592
 593                                 // do we have such a data set?
 594                                 RRDSET *st = rrdset_find_byname(tok);
 595                                 if(!st) st = rrdset_find(tok);
 596                                 if(!st) {
 597                                         // we don't have it
 598                                         // try to send a file with that name
 599                                         w->data->bytes = 0;
 600                                         code = mysendfile(w, tok);
 601                                 }
 602                                 else {
 603                                         code = 200;
 604                                         debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
 605                                         w->data->contenttype = CT_APPLICATION_JSON;
 606                                         w->data->bytes = 0;
 607                                         rrd_stats_graph_json(st, url, w->data);
 608                                 }
 609                         }
 610                         else if(strcmp(tok, "debug") == 0) {
 611                                 w->data->bytes = 0;
 612
 613                                 // get the name of the data to show
 614                                 tok = mystrsep(&url, "/?&");
 615                                 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
 616
 617                                 // do we have such a data set?
 618                                 RRDSET *st = rrdset_find_byname(tok);
 619                                 if(!st) st = rrdset_find(tok);
 620                                 if(!st) {
 621                                         code = 404;
 622                                         web_buffer_printf(w->data, "Chart %s is not found.\r\n", tok);
 623                                         debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
 624                                 }
 625                                 else {
 626                                         code = 200;
 627                                         debug_flags |= D_RRD_STATS;
 628                                         st->debug = st->debug?0:1;
 629                                         web_buffer_printf(w->data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
 630                                         debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
 631                                 }
 632                         }
 633                         else if(strcmp(tok, "mirror") == 0) {
 634                                 code = 200;
 635
 636                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
 637
 638                                 // replace the zero bytes with spaces
 639                                 int i;
 640                                 for(i = 0; i < w->data->size; i++)
 641                                         if(w->data->buffer[i] == '\0') w->data->buffer[i] = ' ';
 642
 643                                 // just leave the buffer as is
 644                                 // it will be copied back to the client
 645                         }
 646                         else if(strcmp(tok, "list") == 0) {
 647                                 code = 200;
 648
 649                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
 650
 651                                 w->data->bytes = 0;
 652                                 RRDSET *st = rrdset_root;
 653
 654                                 for ( ; st ; st = st->next )
 655                                         web_buffer_printf(w->data, "%s\n", st->name);
 656                         }
 657                         else if(strcmp(tok, "all.json") == 0) {
 658                                 code = 200;
 659                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
 660
 661                                 w->data->contenttype = CT_APPLICATION_JSON;
 662                                 w->data->bytes = 0;
 663                                 rrd_stats_all_json(w->data);
 664                         }
 665                         else if(strcmp(tok, "netdata.conf") == 0) {
 666                                 code = 200;
 667                                 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
 668
 669                                 w->data->contenttype = CT_TEXT_PLAIN;
 670                                 w->data->bytes = 0;
 671                                 generate_config(w->data, 0);
 672                         }
 673                         else if(strcmp(tok, WEB_PATH_FILE) == 0) { // "file"
 674                                 tok = mystrsep(&url, "/?&");
 675                                 if(tok && *tok) code = mysendfile(w, tok);
 676                                 else {
 677                                         code = 400;
 678                                         w->data->bytes = 0;
 679                                         strcpy(w->data->buffer, "You have to give a filename to get.\r\n");
 680                                         w->data->bytes = strlen(w->data->buffer);
 681                                 }
 682                         }
 683                         else if(!tok[0]) {
 684                                 w->data->bytes = 0;
 685                                 code = mysendfile(w, "index.html");
 686                         }
 687                         else {
 688                                 w->data->bytes = 0;
 689                                 code = mysendfile(w, tok);
 690                         }
 691
 692                 }
 693                 else {
 694                         strcpy(w->last_url, "not a valid response");
 695
 696                         if(buf) debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, buf);
 697
 698                         code = 500;
 699                         w->data->bytes = 0;
 700                         strcpy(w->data->buffer, "I don't understand you...\r\n");
 701                         w->data->bytes = strlen(w->data->buffer);
 702                 }
 703
 704                 // free url_decode() buffer
 705                 if(pointer_to_free) free(pointer_to_free);
 706         }
 707         else if(w->data->bytes > 8192) {
 708                 strcpy(w->last_url, "too big request");
 709
 710                 debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big.", w->id);
 711
 712                 code = 400;
 713                 w->data->bytes = 0;
 714                 strcpy(w->data->buffer, "Received request is too big.\r\n");
 715                 w->data->bytes = strlen(w->data->buffer);
 716         }
 717         else {
 718                 // wait for more data
 719                 w->wait_receive = 1;
 720                 return;
 721         }
 722
 723         if(w->data->bytes > w->data->size) {
 724                 error("%llu: memory overflow encountered (size is %ld, written %ld).", w->data->size, w->data->bytes);
 725         }
 726
 727         gettimeofday(&w->tv_ready, NULL);
 728         w->data->date = time(NULL);
 729         w->data->sent = 0;
 730
 731         // prepare the HTTP response header
 732         debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
 733
 734         char *content_type_string = "";
 735         switch(w->data->contenttype) {
 736                 case CT_TEXT_HTML:
 737                         content_type_string = "text/html";
 738                         break;
 739
 740                 case CT_APPLICATION_XML:
 741                         content_type_string = "application/xml";
 742                         break;
 743
 744                 case CT_APPLICATION_JSON:
 745                         content_type_string = "application/json";
 746                         break;
 747
 748                 case CT_APPLICATION_X_JAVASCRIPT:
 749                         content_type_string = "application/x-javascript";
 750                         break;
 751
 752                 case CT_TEXT_CSS:
 753                         content_type_string = "text/css";
 754                         break;
 755
 756                 case CT_TEXT_XML:
 757                         content_type_string = "text/xml";
 758                         break;
 759
 760                 case CT_TEXT_XSL:
 761                         content_type_string = "text/xsl";
 762                         break;
 763
 764                 case CT_APPLICATION_OCTET_STREAM:
 765                         content_type_string = "application/octet-stream";
 766                         break;
 767
 768                 case CT_IMAGE_SVG_XML:
 769                         content_type_string = "image/svg+xml";
 770                         break;
 771
 772                 case CT_APPLICATION_X_FONT_TRUETYPE:
 773                         content_type_string = "application/x-font-truetype";
 774                         break;
 775
 776                 case CT_APPLICATION_X_FONT_OPENTYPE:
 777                         content_type_string = "application/x-font-opentype";
 778                         break;
 779
 780                 case CT_APPLICATION_FONT_WOFF:
 781                         content_type_string = "application/font-woff";
 782                         break;
 783
 784                 case CT_APPLICATION_VND_MS_FONTOBJ:
 785                         content_type_string = "application/vnd.ms-fontobject";
 786                         break;
 787
 788                 default:
 789                 case CT_TEXT_PLAIN:
 790                         content_type_string = "text/plain";
 791                         break;
 792         }
 793
 794         char *code_msg = "";
 795         switch(code) {
 796                 case 200:
 797                         code_msg = "OK";
 798                         break;
 799
 800                 case 307:
 801                         code_msg = "Temporary Redirect";
 802                         break;
 803
 804                 case 400:
 805                         code_msg = "Bad Request";
 806                         break;
 807
 808                 case 403:
 809                         code_msg = "Forbidden";
 810                         break;
 811
 812                 case 404:
 813                         code_msg = "Not Found";
 814                         break;
 815
 816                 default:
 817                         code_msg = "Internal Server Error";
 818                         break;
 819         }
 820
 821         char date[100];
 822         struct tm tm = *gmtime(&w->data->date);
 823         strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", &tm);
 824
 825         char custom_header[MAX_HTTP_HEADER_SIZE + 1] = "";
 826         if(w->response_header[0])
 827                 strcpy(custom_header, w->response_header);
 828
 829         int headerlen = 0;
 830         headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
 831                 "HTTP/1.1 %d %s\r\n"
 832                 "Connection: %s\r\n"
 833                 "Server: NetData Embedded HTTP Server\r\n"
 834                 "Content-Type: %s\r\n"
 835                 "Access-Control-Allow-Origin: *\r\n"
 836                 "Date: %s\r\n"
 837                 , code, code_msg
 838                 , w->keepalive?"keep-alive":"close"
 839                 , content_type_string
 840                 , date
 841                 );
 842
 843         if(custom_header[0])
 844                 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen, "%s", custom_header);
 845
 846         if(w->mode == WEB_CLIENT_MODE_NORMAL) {
 847                 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
 848                         "Expires: %s\r\n"
 849                         "Cache-Control: no-cache\r\n"
 850                         , date
 851                         );
 852         }
 853         else {
 854                 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
 855                         "Cache-Control: public\r\n"
 856                         );
 857         }
 858
 859         // if we know the content length, put it
 860         if(!w->zoutput && (w->data->bytes || w->data->rbytes))
 861                 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
 862                         "Content-Length: %ld\r\n"
 863                         , w->data->bytes?w->data->bytes:w->data->rbytes
 864                         );
 865         else if(!w->zoutput)
 866                 w->keepalive = 0;       // content-length is required for keep-alive
 867
 868         if(w->zoutput) {
 869                 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
 870                         "Content-Encoding: gzip\r\n"
 871                         "Transfer-Encoding: chunked\r\n"
 872                         );
 873         }
 874
 875         headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen, "\r\n");
 876
 877         // disable TCP_NODELAY, to buffer the header
 878         int flag = 0;
 879         if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to disable TCP_NODELAY on socket.", w->id);
 880
 881         // sent the HTTP header
 882         debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'", w->id, headerlen, w->response_header);
 883
 884         bytes = send(w->ofd, w->response_header, headerlen, 0);
 885         if(bytes != headerlen)
 886                 error("%llu: HTTP Header failed to be sent (I sent %d bytes but the system sent %d bytes).", w->id, headerlen, bytes);
 887         else {
 888                 global_statistics_lock();
 889                 global_statistics.bytes_sent += bytes;
 890                 global_statistics_unlock();
 891         }
 892
 893         // enable TCP_NODELAY, to send all data immediately at the next send()
 894         flag = 1;
 895         if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
 896
 897         // enable sending immediately if we have data
 898         if(w->data->bytes) w->wait_send = 1;
 899         else w->wait_send = 0;
 900
 901         // pretty logging
 902         switch(w->mode) {
 903                 case WEB_CLIENT_MODE_NORMAL:
 904                         debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->data->bytes);
 905                         break;
 906
 907                 case WEB_CLIENT_MODE_FILECOPY:
 908                         if(w->data->rbytes) {
 909                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->data->rbytes);
 910                                 w->wait_receive = 1;
 911
 912                                 /*
 913                                 // utilize the kernel sendfile() for copying the file to the socket.
 914                                 // this block of code can be commented, without anything missing.
 915                                 // when it is commented, the program will copy the data using async I/O.
 916                                 {
 917                                         long len = sendfile(w->ofd, w->ifd, NULL, w->data->rbytes);
 918                                         if(len != w->data->rbytes) error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->data->rbytes, len);
 919                                         else web_client_reset(w);
 920                                 }
 921                                 */
 922                         }
 923                         else
 924                                 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
 925                         break;
 926
 927                 default:
 928                         fatal("%llu: Unknown client mode %d.", w->id, w->mode);
 929                         break;
 930         }
 931 }
 932
 933 long web_client_send_chunk_header(struct web_client *w, int len)
 934 {
 935         debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
 936         char buf[1024];
 937         sprintf(buf, "%X\r\n", len);
 938         int bytes = send(w->ofd, buf, strlen(buf), MSG_DONTWAIT);
 939
 940         if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
 941         else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk header to the client.", w->id);
 942         else debug(D_DEFLATE, "%llu: Failed to send chunk header to client. Reason: %s", w->id, strerror(errno));
 943
 944         return bytes;
 945 }
 946
 947 long web_client_send_chunk_close(struct web_client *w)
 948 {
 949         //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
 950
 951         int bytes = send(w->ofd, "\r\n", 2, MSG_DONTWAIT);
 952
 953         if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
 954         else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
 955         else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client. Reason: %s", w->id, strerror(errno));
 956
 957         return bytes;
 958 }
 959
 960 long web_client_send_chunk_finalize(struct web_client *w)
 961 {
 962         //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
 963
 964         int bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, MSG_DONTWAIT);
 965
 966         if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
 967         else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
 968         else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client. Reason: %s", w->id, strerror(errno));
 969
 970         return bytes;
 971 }
 972
 973 long web_client_send_deflate(struct web_client *w)
 974 {
 975         long bytes = 0, t = 0;
 976
 977         // when using compression,
 978         // w->data->sent is the amount of bytes passed through compression
 979
 980         // debug(D_DEFLATE, "%llu: TEST w->data->bytes = %d, w->data->sent = %d, w->zhave = %d, w->zsent = %d, w->zstream.avail_in = %d, w->zstream.avail_out = %d, w->zstream.total_in = %d, w->zstream.total_out = %d.", w->id, w->data->bytes, w->data->sent, w->zhave, w->zsent, w->zstream.avail_in, w->zstream.avail_out, w->zstream.total_in, w->zstream.total_out);
 981
 982         if(w->data->bytes - w->data->sent == 0 && w->zstream.avail_in == 0 && w->zhave == w->zsent && w->zstream.avail_out != 0) {
 983                 // there is nothing to send
 984
 985                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
 986
 987                 // finalize the chunk
 988                 if(w->data->sent != 0)
 989                         t += web_client_send_chunk_finalize(w);
 990
 991                 // there can be two cases for this
 992                 // A. we have done everything
 993                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
 994
 995                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->data->rbytes && w->data->rbytes > w->data->bytes) {
 996                         // we have to wait, more data will come
 997                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
 998                         w->wait_send = 0;
 999                         return(0);
1000                 }
1001
1002                 if(w->keepalive == 0) {
1003                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->data->sent);
1004                         errno = 0;
1005                         return(-1);
1006                 }
1007
1008                 // reset the client
1009                 web_client_reset(w);
1010                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
1011                 return(0);
1012         }
1013
1014         if(w->zstream.avail_out == 0 && w->zhave == w->zsent) {
1015                 // compress more input data
1016
1017                 // close the previous open chunk
1018                 if(w->data->sent != 0) t += web_client_send_chunk_close(w);
1019
1020                 debug(D_DEFLATE, "%llu: Compressing %d bytes starting from %d.", w->id, (w->data->bytes - w->data->sent), w->data->sent);
1021
1022                 // give the compressor all the data not passed through the compressor yet
1023                 if(w->data->bytes > w->data->sent) {
1024                         w->zstream.next_in = (Bytef *)&w->data->buffer[w->data->sent];
1025                         w->zstream.avail_in = (w->data->bytes - w->data->sent);
1026                 }
1027
1028                 // reset the compressor output buffer
1029                 w->zstream.next_out = w->zbuffer;
1030                 w->zstream.avail_out = ZLIB_CHUNK;
1031
1032                 // ask for FINISH if we have all the input
1033                 int flush = Z_SYNC_FLUSH;
1034                 if(w->mode == WEB_CLIENT_MODE_NORMAL
1035                         || (w->mode == WEB_CLIENT_MODE_FILECOPY && w->data->bytes == w->data->rbytes)) {
1036                         flush = Z_FINISH;
1037                         debug(D_DEFLATE, "%llu: Requesting Z_FINISH.", w->id);
1038                 }
1039                 else {
1040                         debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
1041                 }
1042
1043                 // compress
1044                 if(deflate(&w->zstream, flush) == Z_STREAM_ERROR) {
1045                         error("%llu: Compression failed. Closing down client.", w->id);
1046                         web_client_reset(w);
1047                         return(-1);
1048                 }
1049
1050                 w->zhave = ZLIB_CHUNK - w->zstream.avail_out;
1051                 w->zsent = 0;
1052
1053                 // keep track of the bytes passed through the compressor
1054                 w->data->sent = w->data->bytes;
1055
1056                 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->zhave);
1057
1058                 // open a new chunk
1059                 t += web_client_send_chunk_header(w, w->zhave);
1060         }
1061
1062         bytes = send(w->ofd, &w->zbuffer[w->zsent], w->zhave - w->zsent, MSG_DONTWAIT);
1063         if(bytes > 0) {
1064                 w->zsent += bytes;
1065                 if(t > 0) bytes += t;
1066                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
1067         }
1068         else if(bytes == 0) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
1069         else debug(D_WEB_CLIENT, "%llu: Failed to send data to client. Reason: %s", w->id, strerror(errno));
1070
1071         return(bytes);
1072 }
1073
1074 long web_client_send(struct web_client *w)
1075 {
1076         if(w->zoutput) return web_client_send_deflate(w);
1077
1078         long bytes;
1079
1080         if(w->data->bytes - w->data->sent == 0) {
1081                 // there is nothing to send
1082
1083                 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1084
1085                 // there can be two cases for this
1086                 // A. we have done everything
1087                 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
1088
1089                 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->data->rbytes && w->data->rbytes > w->data->bytes) {
1090                         // we have to wait, more data will come
1091                         debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1092                         w->wait_send = 0;
1093                         return(0);
1094                 }
1095
1096                 if(w->keepalive == 0) {
1097                         debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->data->sent);
1098                         errno = 0;
1099                         return(-1);
1100                 }
1101
1102                 web_client_reset(w);
1103                 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
1104                 return(0);
1105         }
1106
1107         bytes = send(w->ofd, &w->data->buffer[w->data->sent], w->data->bytes - w->data->sent, MSG_DONTWAIT);
1108         if(bytes > 0) {
1109                 w->data->sent += bytes;
1110                 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
1111         }
1112         else if(bytes == 0) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
1113         else debug(D_WEB_CLIENT, "%llu: Failed to send data to client. Reason: %s", w->id, strerror(errno));
1114
1115
1116         return(bytes);
1117 }
1118
1119 long web_client_receive(struct web_client *w)
1120 {
1121         // do we have any space for more data?
1122         web_buffer_increase(w->data, WEB_DATA_LENGTH_INCREASE_STEP);
1123
1124         long left = w->data->size - w->data->bytes;
1125         long bytes;
1126
1127         if(w->mode == WEB_CLIENT_MODE_FILECOPY)
1128                 bytes = read(w->ifd, &w->data->buffer[w->data->bytes], (left-1));
1129         else
1130                 bytes = recv(w->ifd, &w->data->buffer[w->data->bytes], left-1, MSG_DONTWAIT);
1131
1132         if(bytes > 0) {
1133                 int old = w->data->bytes;
1134                 w->data->bytes += bytes;
1135                 w->data->buffer[w->data->bytes] = '\0';
1136
1137                 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
1138                 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->data->buffer[old]);
1139
1140                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
1141                         w->wait_send = 1;
1142                         if(w->data->rbytes && w->data->bytes >= w->data->rbytes) w->wait_receive = 0;
1143                 }
1144         }
1145         else if(bytes == 0) {
1146                 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
1147
1148                 // if we cannot read, it means we have an error on input.
1149                 // if however, we are copying a file from ifd to ofd, we should not return an error.
1150                 // in this case, the error should be generated when the file has been sent to the client.
1151
1152                 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
1153                         // we are copying data fron ifd to ofd
1154                         // let it finish copying...
1155                         w->wait_receive = 0;
1156                         debug(D_WEB_CLIENT, "%llu: Disabling input.", w->id);
1157                 }
1158                 else {
1159                         bytes = -1;
1160                         errno = 0;
1161                 }
1162         }
1163
1164         return(bytes);
1165 }
1166
1167
1168 // --------------------------------------------------------------------------------------
1169 // the thread of a single client
1170
1171 // 1. waits for input and output, using async I/O
1172 // 2. it processes HTTP requests
1173 // 3. it generates HTTP responses
1174 // 4. it copies data from input to output if mode is FILECOPY
1175
1176 void *web_client_main(void *ptr)
1177 {
1178         if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
1179                 error("Cannot set pthread cancel type to DEFERRED.");
1180
1181         if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
1182                 error("Cannot set pthread cancel state to ENABLE.");
1183
1184         struct timeval tv;
1185         struct web_client *w = ptr;
1186         int retval;
1187         fd_set ifds, ofds, efds;
1188         int fdmax = 0;
1189
1190         for(;;) {
1191                 FD_ZERO (&ifds);
1192                 FD_ZERO (&ofds);
1193                 FD_ZERO (&efds);
1194
1195                 FD_SET(w->ifd, &efds);
1196
1197                 if(w->ifd != w->ofd)
1198                         FD_SET(w->ofd, &efds);
1199
1200                 if (w->wait_receive) {
1201                         FD_SET(w->ifd, &ifds);
1202                         if(w->ifd > fdmax) fdmax = w->ifd;
1203                 }
1204
1205                 if (w->wait_send) {
1206                         FD_SET(w->ofd, &ofds);
1207                         if(w->ofd > fdmax) fdmax = w->ofd;
1208                 }
1209
1210                 tv.tv_sec = web_client_timeout;
1211                 tv.tv_usec = 0;
1212
1213                 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
1214                 retval = select(fdmax+1, &ifds, &ofds, &efds, &tv);
1215
1216                 if(retval == -1) {
1217                         debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: select() failed.", w->id);
1218                         continue;
1219                 }
1220                 else if(!retval) {
1221                         // timeout
1222                         web_client_reset(w);
1223                         w->obsolete = 1;
1224                         return NULL;
1225                 }
1226
1227                 if(FD_ISSET(w->ifd, &efds)) {
1228                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on input socket (%s).", w->id, strerror(errno));
1229                         web_client_reset(w);
1230                         w->obsolete = 1;
1231                         return NULL;
1232                 }
1233
1234                 if(FD_ISSET(w->ofd, &efds)) {
1235                         debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on output socket (%s).", w->id, strerror(errno));
1236                         web_client_reset(w);
1237                         w->obsolete = 1;
1238                         return NULL;
1239                 }
1240
1241                 if(w->wait_send && FD_ISSET(w->ofd, &ofds)) {
1242                         long bytes;
1243                         if((bytes = web_client_send(w)) < 0) {
1244                                 debug(D_WEB_CLIENT, "%llu: Closing client (input: %s).", w->id, strerror(errno));
1245                                 web_client_reset(w);
1246                                 w->obsolete = 1;
1247                                 errno = 0;
1248                                 return NULL;
1249                         }
1250                         else {
1251                                 global_statistics_lock();
1252                                 global_statistics.bytes_sent += bytes;
1253                                 global_statistics_unlock();
1254                         }
1255                 }
1256
1257                 if(w->wait_receive && FD_ISSET(w->ifd, &ifds)) {
1258                         long bytes;
1259                         if((bytes = web_client_receive(w)) < 0) {
1260                                 debug(D_WEB_CLIENT, "%llu: Closing client (output: %s).", w->id, strerror(errno));
1261                                 web_client_reset(w);
1262                                 w->obsolete = 1;
1263                                 errno = 0;
1264                                 return NULL;
1265                         }
1266                         else {
1267                                 if(w->mode != WEB_CLIENT_MODE_FILECOPY) {
1268                                         global_statistics_lock();
1269                                         global_statistics.bytes_received += bytes;
1270                                         global_statistics_unlock();
1271                                 }
1272                         }
1273
1274                         if(w->mode == WEB_CLIENT_MODE_NORMAL) web_client_process(w);
1275                 }
1276         }
1277         debug(D_WEB_CLIENT, "%llu: done...", w->id);
1278
1279         return NULL;
1280 }