7 #include <sys/socket.h>
8 #include <netinet/in.h>
14 #include <netinet/tcp.h>
21 #include "web_buffer.h"
22 #include "web_server.h"
23 #include "global_statistics.h"
27 #include "web_client.h"
29 #define INITIAL_WEB_DATA_LENGTH 65536
31 int web_client_timeout = DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS;
32 int web_enable_gzip = 1;
34 struct web_client *web_clients = NULL;
35 unsigned long long web_clients_count = 0;
37 struct web_client *web_client_create(int listener)
41 w = calloc(1, sizeof(struct web_client));
43 error("Cannot allocate new web_client memory.");
47 w->id = ++web_clients_count;
48 w->mode = WEB_CLIENT_MODE_NORMAL;
51 struct sockaddr *sadr;
54 sadr = (struct sockaddr*) &w->clientaddr;
55 addrlen = sizeof(w->clientaddr);
57 w->ifd = accept(listener, sadr, &addrlen);
59 error("%llu: Cannot accept new incoming connection.", w->id);
65 if(getnameinfo(sadr, addrlen, w->client_ip, NI_MAXHOST, w->client_port, NI_MAXSERV, NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
66 error("Cannot getnameinfo() on received client connection.");
67 strncpy(w->client_ip, "UNKNOWN", NI_MAXHOST);
68 strncpy(w->client_port, "UNKNOWN", NI_MAXSERV);
70 w->client_ip[NI_MAXHOST] = '\0';
71 w->client_port[NI_MAXSERV] = '\0';
73 switch(sadr->sa_family) {
76 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 if(strncmp(w->client_ip, "::ffff:", 7) == 0) {
81 strcpy(w->client_ip, &w->client_ip[7]);
82 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);
84 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);
88 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);
93 if(setsockopt(w->ifd, SOL_SOCKET, SO_KEEPALIVE, (char *) &flag, sizeof(int)) != 0) error("%llu: Cannot set SO_KEEPALIVE on socket.", w->id);
96 w->data = web_buffer_create(INITIAL_WEB_DATA_LENGTH);
97 if(unlikely(!w->data)) {
98 // no need for error log - web_buffer_create already logged the error
106 if(web_clients) web_clients->prev = w;
107 w->next = web_clients;
110 global_statistics.connected_clients++;
115 struct web_client *web_client_free(struct web_client *w)
117 struct web_client *n = w->next;
119 debug(D_WEB_CLIENT_ACCESS, "%llu: Closing web client from %s port %s.", w->id, w->client_ip, w->client_port);
121 if(w->prev) w->prev->next = w->next;
122 if(w->next) w->next->prev = w->prev;
124 if(w == web_clients) web_clients = w->next;
126 if(w->data) web_buffer_free(w->data);
128 if(w->ofd != w->ifd) close(w->ofd);
131 global_statistics.connected_clients--;
136 int mysendfile(struct web_client *w, char *filename)
138 static char *web_dir = NULL;
139 if(!web_dir) web_dir = config_get("global", "web files directory", "web");
141 debug(D_WEB_CLIENT, "%llu: Looking for file '%s'...", w->id, filename);
143 // skip leading slashes
144 while (*filename == '/') filename++;
146 // if the filename contain known paths, skip them
147 if(strncmp(filename, WEB_PATH_DATA "/", strlen(WEB_PATH_DATA) + 1) == 0) filename = &filename[strlen(WEB_PATH_DATA) + 1];
148 else if(strncmp(filename, WEB_PATH_DATASOURCE "/", strlen(WEB_PATH_DATASOURCE) + 1) == 0) filename = &filename[strlen(WEB_PATH_DATASOURCE) + 1];
149 else if(strncmp(filename, WEB_PATH_GRAPH "/", strlen(WEB_PATH_GRAPH) + 1) == 0) filename = &filename[strlen(WEB_PATH_GRAPH) + 1];
150 else if(strncmp(filename, WEB_PATH_FILE "/", strlen(WEB_PATH_FILE) + 1) == 0) filename = &filename[strlen(WEB_PATH_FILE) + 1];
152 // if the filename contains a / or a .., refuse to serve it
153 if(strchr(filename, '/') != 0 || strstr(filename, "..") != 0) {
154 debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
155 web_buffer_printf(w->data, "File '%s' cannot be served. Filenames cannot contain / or ..", filename);
160 char webfilename[FILENAME_MAX + 1];
161 snprintf(webfilename, FILENAME_MAX, "%s/%s", web_dir, filename);
163 // check if the file exists
165 if(lstat(webfilename, &stat) != 0) {
166 error("%llu: File '%s' is not found.", w->id, webfilename);
167 web_buffer_printf(w->data, "File '%s' does not exist, or is not accessible.", filename);
171 // check if the file is owned by us
172 if(stat.st_uid != getuid() && stat.st_uid != geteuid()) {
173 error("%llu: File '%s' is owned by user %d (I run as user %d). Access Denied.", w->id, webfilename, stat.st_uid, getuid());
174 web_buffer_printf(w->data, "Access to file '%s' is not permitted.", filename);
179 w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
183 if(errno == EBUSY || errno == EAGAIN) {
184 error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
185 snprintf(w->response_header, MAX_HTTP_HEADER_SIZE, "Location: /" WEB_PATH_FILE "/%s\r\n", filename);
186 web_buffer_printf(w->data, "The file '%s' is currently busy. Please try again later.", filename);
190 error("%llu: Cannot open file '%s'.", w->id, webfilename);
191 web_buffer_printf(w->data, "Cannot open file '%s'.", filename);
196 // pick a Content-Type for the file
197 if(strstr(filename, ".html") != NULL) w->data->contenttype = CT_TEXT_HTML;
198 else if(strstr(filename, ".js") != NULL) w->data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
199 else if(strstr(filename, ".css") != NULL) w->data->contenttype = CT_TEXT_CSS;
200 else if(strstr(filename, ".xml") != NULL) w->data->contenttype = CT_TEXT_XML;
201 else if(strstr(filename, ".xsl") != NULL) w->data->contenttype = CT_TEXT_XSL;
202 else if(strstr(filename, ".txt") != NULL) w->data->contenttype = CT_TEXT_PLAIN;
203 else if(strstr(filename, ".svg") != NULL) w->data->contenttype = CT_IMAGE_SVG_XML;
204 else if(strstr(filename, ".ttf") != NULL) w->data->contenttype = CT_APPLICATION_X_FONT_TRUETYPE;
205 else if(strstr(filename, ".otf") != NULL) w->data->contenttype = CT_APPLICATION_X_FONT_OPENTYPE;
206 else if(strstr(filename, ".woff") != NULL) w->data->contenttype = CT_APPLICATION_FONT_WOFF;
207 else if(strstr(filename, ".eot") != NULL) w->data->contenttype = CT_APPLICATION_VND_MS_FONTOBJ;
208 else w->data->contenttype = CT_APPLICATION_OCTET_STREAM;
210 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);
212 w->mode = WEB_CLIENT_MODE_FILECOPY;
216 w->data->buffer[0] = '\0';
217 w->data->rbytes = stat.st_size;
218 w->data->date = stat.st_mtim.tv_sec;
223 void web_client_reset(struct web_client *w)
226 gettimeofday(&tv, NULL);
228 long sent = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->data->rbytes:w->data->bytes;
230 #ifndef NETDATA_WITHOUT_ZLIB
231 if(likely(w->zoutput)) sent = (long)w->zstream.total_out;
234 long size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->data->rbytes:w->data->bytes;
236 if(likely(w->last_url[0]))
237 log_access("%llu: (sent/all = %ld/%ld bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %s: '%s'",
239 sent, size, -((size>0)?((float)(size-sent)/(float)size * 100.0):0.0),
240 (float)usecdiff(&w->tv_ready, &w->tv_in) / 1000.0,
241 (float)usecdiff(&tv, &w->tv_ready) / 1000.0,
242 (float)usecdiff(&tv, &w->tv_in) / 1000.0,
243 (w->mode == WEB_CLIENT_MODE_FILECOPY)?"filecopy":"data",
247 debug(D_WEB_CLIENT, "%llu: Reseting client.", w->id);
249 if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
250 debug(D_WEB_CLIENT, "%llu: Closing filecopy input file.", w->id);
255 w->last_url[0] = '\0';
257 w->data->contenttype = CT_TEXT_PLAIN;
258 w->mode = WEB_CLIENT_MODE_NORMAL;
264 w->response_header[0] = '\0';
265 w->data->buffer[0] = '\0';
272 // if we had enabled compression, release it
273 #ifndef NETDATA_WITHOUT_ZLIB
274 if(w->zinitialized) {
275 debug(D_DEFLATE, "%llu: Reseting compression.", w->id);
276 deflateEnd(&w->zstream);
279 w->zstream.avail_in = 0;
280 w->zstream.avail_out = 0;
281 w->zstream.total_in = 0;
282 w->zstream.total_out = 0;
285 #endif // NETDATA_WITHOUT_ZLIB
288 #ifndef NETDATA_WITHOUT_ZLIB
289 void web_client_enable_deflate(struct web_client *w) {
290 if(w->zinitialized == 1) {
291 error("%llu: Compression has already be initialized for this client.", w->id);
296 error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
300 w->zstream.zalloc = Z_NULL;
301 w->zstream.zfree = Z_NULL;
302 w->zstream.opaque = Z_NULL;
304 w->zstream.next_in = (Bytef *)w->data->buffer;
305 w->zstream.avail_in = 0;
306 w->zstream.total_in = 0;
308 w->zstream.next_out = w->zbuffer;
309 w->zstream.avail_out = 0;
310 w->zstream.total_out = 0;
312 w->zstream.zalloc = Z_NULL;
313 w->zstream.zfree = Z_NULL;
314 w->zstream.opaque = Z_NULL;
316 // if(deflateInit(&w->zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
317 // error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
321 // Select GZIP compression: windowbits = 15 + 16 = 31
322 if(deflateInit2(&w->zstream, Z_DEFAULT_COMPRESSION, Z_DEFLATED, 31, 8, Z_DEFAULT_STRATEGY) != Z_OK) {
323 error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
331 debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
333 #endif // NETDATA_WITHOUT_ZLIB
335 int web_client_data_request(struct web_client *w, char *url, int datasource_type)
337 char *args = strchr(url, '?');
343 // get the name of the data to show
344 char *tok = mystrsep(&url, "/");
345 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
347 // do we have such a data set?
348 RRDSET *st = rrdset_find_byname(tok);
349 if(!st) st = rrdset_find(tok);
352 // try to send a file with that name
354 return(mysendfile(w, tok));
358 debug(D_WEB_CLIENT, "%llu: Found RRD data with name '%s'.", w->id, tok);
360 // how many entries does the client want?
361 long lines = rrd_default_history_entries;
362 long group_count = 1;
363 time_t after = 0, before = 0;
364 int group_method = GROUP_AVERAGE;
368 // parse the lines required
369 tok = mystrsep(&url, "/");
370 if(tok) lines = atoi(tok);
371 if(lines < 1) lines = 1;
374 // parse the group count required
375 tok = mystrsep(&url, "/");
376 if(tok) group_count = atoi(tok);
377 if(group_count < 1) group_count = 1;
378 //if(group_count > save_history / 20) group_count = save_history / 20;
381 // parse the grouping method required
382 tok = mystrsep(&url, "/");
383 if(strcmp(tok, "max") == 0) group_method = GROUP_MAX;
384 else if(strcmp(tok, "average") == 0) group_method = GROUP_AVERAGE;
385 else if(strcmp(tok, "sum") == 0) group_method = GROUP_SUM;
386 else debug(D_WEB_CLIENT, "%llu: Unknown group method '%s'", w->id, tok);
390 tok = mystrsep(&url, "/");
391 if(tok) after = strtoul(tok, NULL, 10);
392 if(after < 0) after = 0;
396 tok = mystrsep(&url, "/");
397 if(tok) before = strtoul(tok, NULL, 10);
398 if(before < 0) before = 0;
402 tok = mystrsep(&url, "/");
403 if(tok && strcmp(tok, "nonzero") == 0) nonzero = 1;
406 w->data->contenttype = CT_APPLICATION_JSON;
409 char *google_version = "0.6";
410 char *google_reqId = "0";
411 char *google_sig = "0";
412 char *google_out = "json";
413 char *google_responseHandler = "google.visualization.Query.setResponse";
414 char *google_outFileName = NULL;
415 unsigned long last_timestamp_in_data = 0;
416 if(datasource_type == DATASOURCE_GOOGLE_JSON || datasource_type == DATASOURCE_GOOGLE_JSONP) {
418 w->data->contenttype = CT_APPLICATION_X_JAVASCRIPT;
421 tok = mystrsep(&args, "&");
423 char *name = mystrsep(&tok, "=");
424 if(name && strcmp(name, "tqx") == 0) {
425 char *key = mystrsep(&tok, ":");
426 char *value = mystrsep(&tok, ";");
427 if(key && value && *key && *value) {
428 if(strcmp(key, "version") == 0)
429 google_version = value;
431 else if(strcmp(key, "reqId") == 0)
432 google_reqId = value;
434 else if(strcmp(key, "sig") == 0)
437 else if(strcmp(key, "out") == 0)
440 else if(strcmp(key, "responseHandler") == 0)
441 google_responseHandler = value;
443 else if(strcmp(key, "outFileName") == 0)
444 google_outFileName = value;
450 debug(D_WEB_CLIENT_ACCESS, "%llu: GOOGLE JSONP: version = '%s', reqId = '%s', sig = '%s', out = '%s', responseHandler = '%s', outFileName = '%s'",
451 w->id, google_version, google_reqId, google_sig, google_out, google_responseHandler, google_outFileName
454 if(datasource_type == DATASOURCE_GOOGLE_JSONP) {
455 last_timestamp_in_data = strtoul(google_sig, NULL, 0);
457 // check the client wants json
458 if(strcmp(google_out, "json") != 0) {
459 w->data->bytes = snprintf(w->data->buffer, w->data->size,
460 "%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.'}]});",
461 google_responseHandler, google_version, google_reqId, google_out);
467 if(datasource_type == DATASOURCE_GOOGLE_JSONP) {
468 w->data->bytes = snprintf(w->data->buffer, w->data->size,
469 "%s({version:'%s',reqId:'%s',status:'ok',sig:'%lu',table:",
470 google_responseHandler, google_version, google_reqId, st->last_updated.tv_sec);
473 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);
474 unsigned long timestamp_in_data = rrd_stats_json(datasource_type, st, w->data, lines, group_count, group_method, after, before, nonzero);
476 if(datasource_type == DATASOURCE_GOOGLE_JSONP) {
477 if(timestamp_in_data > last_timestamp_in_data)
478 w->data->bytes += snprintf(&w->data->buffer[w->data->bytes], w->data->size - w->data->bytes, "});");
481 // the client already has the latest data
482 w->data->bytes = snprintf(w->data->buffer, w->data->size,
483 "%s({version:'%s',reqId:'%s',status:'error',errors:[{reason:'not_modified',message:'Data not modified'}]});",
484 google_responseHandler, google_version, google_reqId);
492 int web_client_parse_request(struct web_client *w) {
496 // query string name-value
499 // http request headers name-value
501 web_client_clean_request(w);
503 debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->data->bytes, w->data->buffer);
505 char *buf = w->data->buffer;
508 // ------------------------------------------------------------------------
511 if(buf && (line = strsep(&buf, "\r\n"))) {
513 if(line && (tok = strsep(&line, " "))) {
514 w->request.protocol = strdup(tok);
522 // ------------------------------------------------------------------------
523 // the rest of the lines
525 while(buf && (line = strsep(&buf, "\r\n"))) {
526 while(line && (tok = strsep(&line, ": "))) {
534 web_client_clean_request(w);
539 void web_client_process(struct web_client *w) {
545 // check if we have an empty line (end of HTTP header)
546 if(strstr(w->data->buffer, "\r\n\r\n")) {
547 global_statistics_lock();
548 global_statistics.web_requests++;
549 global_statistics_unlock();
551 gettimeofday(&w->tv_in, NULL);
552 debug(D_WEB_DATA, "%llu: Processing data buffer of %d bytes: '%s'.", w->id, w->data->bytes, w->data->buffer);
554 // check if the client requested keep-alive HTTP
555 if(strcasestr(w->data->buffer, "Connection: keep-alive")) w->keepalive = 1;
556 else w->keepalive = 0;
558 #ifndef NETDATA_WITHOUT_ZLIB
559 // check if the client accepts deflate
560 if(web_enable_gzip && strstr(w->data->buffer, "gzip"))
561 web_client_enable_deflate(w);
562 #endif // NETDATA_WITHOUT_ZLIB
564 int datasource_type = DATASOURCE_GOOGLE_JSONP;
565 //if(strstr(w->data->buffer, "X-DataSource-Auth"))
566 // datasource_type = DATASOURCE_GOOGLE_JSON;
568 char *buf = w->data->buffer;
569 char *tok = strsep(&buf, " \r\n");
571 char *pointer_to_free = NULL; // keep url_decode() allocated buffer
573 if(buf && strcmp(tok, "GET") == 0) {
574 tok = strsep(&buf, " \r\n");
575 pointer_to_free = url = url_decode(tok);
576 debug(D_WEB_CLIENT, "%llu: Processing HTTP GET on url '%s'.", w->id, url);
578 else if (buf && strcmp(tok, "POST") == 0) {
580 tok = strsep(&buf, " \r\n");
581 pointer_to_free = url = url_decode(tok);
583 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);
586 w->last_url[0] = '\0';
588 strncpy(w->last_url, url, URL_MAX);
589 w->last_url[URL_MAX] = '\0';
591 tok = mystrsep(&url, "/?&");
593 debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
595 if(strcmp(tok, WEB_PATH_DATA) == 0) { // "data"
596 // the client is requesting rrd data
597 datasource_type = DATASOURCE_JSON;
598 code = web_client_data_request(w, url, datasource_type);
600 else if(strcmp(tok, WEB_PATH_DATASOURCE) == 0) { // "datasource"
601 // the client is requesting google datasource
602 code = web_client_data_request(w, url, datasource_type);
604 else if(strcmp(tok, WEB_PATH_GRAPH) == 0) { // "graph"
605 // the client is requesting an rrd graph
607 // get the name of the data to show
608 tok = mystrsep(&url, "/?&");
609 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
611 // do we have such a data set?
612 RRDSET *st = rrdset_find_byname(tok);
613 if(!st) st = rrdset_find(tok);
616 // try to send a file with that name
618 code = mysendfile(w, tok);
622 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending %s.json of RRD_STATS...", w->id, st->name);
623 w->data->contenttype = CT_APPLICATION_JSON;
625 rrd_stats_graph_json(st, url, w->data);
628 else if(strcmp(tok, "debug") == 0) {
631 // get the name of the data to show
632 tok = mystrsep(&url, "/?&");
633 debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
635 // do we have such a data set?
636 RRDSET *st = rrdset_find_byname(tok);
637 if(!st) st = rrdset_find(tok);
640 web_buffer_printf(w->data, "Chart %s is not found.\r\n", tok);
641 debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
645 debug_flags |= D_RRD_STATS;
646 st->debug = st->debug?0:1;
647 web_buffer_printf(w->data, "Chart %s has now debug %s.\r\n", tok, st->debug?"enabled":"disabled");
648 debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, st->debug?"enabled":"disabled");
651 else if(strcmp(tok, "mirror") == 0) {
654 debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
656 // replace the zero bytes with spaces
658 for(i = 0; i < w->data->size; i++)
659 if(w->data->buffer[i] == '\0') w->data->buffer[i] = ' ';
661 // just leave the buffer as is
662 // it will be copied back to the client
664 else if(strcmp(tok, "list") == 0) {
667 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending list of RRD_STATS...", w->id);
670 RRDSET *st = rrdset_root;
672 for ( ; st ; st = st->next )
673 web_buffer_printf(w->data, "%s\n", st->name);
675 else if(strcmp(tok, "all.json") == 0) {
677 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending JSON list of all monitors of RRD_STATS...", w->id);
679 w->data->contenttype = CT_APPLICATION_JSON;
681 rrd_stats_all_json(w->data);
683 else if(strcmp(tok, "netdata.conf") == 0) {
685 debug(D_WEB_CLIENT_ACCESS, "%llu: Sending netdata.conf ...", w->id);
687 w->data->contenttype = CT_TEXT_PLAIN;
689 generate_config(w->data, 0);
691 else if(strcmp(tok, WEB_PATH_FILE) == 0) { // "file"
692 tok = mystrsep(&url, "/?&");
693 if(tok && *tok) code = mysendfile(w, tok);
697 strcpy(w->data->buffer, "You have to give a filename to get.\r\n");
698 w->data->bytes = strlen(w->data->buffer);
703 code = mysendfile(w, "index.html");
707 code = mysendfile(w, tok);
712 strcpy(w->last_url, "not a valid response");
714 if(buf) debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, buf);
718 strcpy(w->data->buffer, "I don't understand you...\r\n");
719 w->data->bytes = strlen(w->data->buffer);
722 // free url_decode() buffer
723 if(pointer_to_free) free(pointer_to_free);
725 else if(w->data->bytes > 8192) {
726 strcpy(w->last_url, "too big request");
728 debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big.", w->id);
732 strcpy(w->data->buffer, "Received request is too big.\r\n");
733 w->data->bytes = strlen(w->data->buffer);
736 // wait for more data
741 if(w->data->bytes > w->data->size) {
742 error("%llu: memory overflow encountered (size is %ld, written %ld).", w->data->size, w->data->bytes);
745 gettimeofday(&w->tv_ready, NULL);
746 w->data->date = time(NULL);
749 // prepare the HTTP response header
750 debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, code);
752 char *content_type_string = "";
753 switch(w->data->contenttype) {
755 content_type_string = "text/html; charset=utf-8";
758 case CT_APPLICATION_XML:
759 content_type_string = "application/xml; charset=utf-8";
762 case CT_APPLICATION_JSON:
763 content_type_string = "application/json; charset=utf-8";
766 case CT_APPLICATION_X_JAVASCRIPT:
767 content_type_string = "application/x-javascript; charset=utf-8";
771 content_type_string = "text/css; charset=utf-8";
775 content_type_string = "text/xml; charset=utf-8";
779 content_type_string = "text/xsl; charset=utf-8";
782 case CT_APPLICATION_OCTET_STREAM:
783 content_type_string = "application/octet-stream";
786 case CT_IMAGE_SVG_XML:
787 content_type_string = "image/svg+xml";
790 case CT_APPLICATION_X_FONT_TRUETYPE:
791 content_type_string = "application/x-font-truetype";
794 case CT_APPLICATION_X_FONT_OPENTYPE:
795 content_type_string = "application/x-font-opentype";
798 case CT_APPLICATION_FONT_WOFF:
799 content_type_string = "application/font-woff";
802 case CT_APPLICATION_VND_MS_FONTOBJ:
803 content_type_string = "application/vnd.ms-fontobject";
808 content_type_string = "text/plain; charset=utf-8";
819 code_msg = "Temporary Redirect";
823 code_msg = "Bad Request";
827 code_msg = "Forbidden";
831 code_msg = "Not Found";
835 code_msg = "Internal Server Error";
840 struct tm tm = *gmtime(&w->data->date);
841 strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", &tm);
843 char custom_header[MAX_HTTP_HEADER_SIZE + 1] = "";
844 if(w->response_header[0])
845 strcpy(custom_header, w->response_header);
848 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
851 "Server: NetData Embedded HTTP Server\r\n"
852 "Content-Type: %s\r\n"
853 "Access-Control-Allow-Origin: *\r\n"
856 , w->keepalive?"keep-alive":"close"
857 , content_type_string
862 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen, "%s", custom_header);
864 if(w->mode == WEB_CLIENT_MODE_NORMAL) {
865 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
867 "Cache-Control: no-cache\r\n"
872 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
873 "Cache-Control: public\r\n"
877 // if we know the content length, put it
878 if(!w->zoutput && (w->data->bytes || w->data->rbytes))
879 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
880 "Content-Length: %ld\r\n"
881 , w->data->bytes?w->data->bytes:w->data->rbytes
884 w->keepalive = 0; // content-length is required for keep-alive
887 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen,
888 "Content-Encoding: gzip\r\n"
889 "Transfer-Encoding: chunked\r\n"
893 headerlen += snprintf(&w->response_header[headerlen], MAX_HTTP_HEADER_SIZE - headerlen, "\r\n");
895 // disable TCP_NODELAY, to buffer the header
897 if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to disable TCP_NODELAY on socket.", w->id);
899 // sent the HTTP header
900 debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %d: '%s'", w->id, headerlen, w->response_header);
902 bytes = send(w->ofd, w->response_header, headerlen, 0);
903 if(bytes != headerlen)
904 error("%llu: HTTP Header failed to be sent (I sent %d bytes but the system sent %d bytes).", w->id, headerlen, bytes);
906 global_statistics_lock();
907 global_statistics.bytes_sent += bytes;
908 global_statistics_unlock();
911 // enable TCP_NODELAY, to send all data immediately at the next send()
913 if(setsockopt(w->ofd, IPPROTO_TCP, TCP_NODELAY, (char *) &flag, sizeof(int)) != 0) error("%llu: failed to enable TCP_NODELAY on socket.", w->id);
915 // enable sending immediately if we have data
916 if(w->data->bytes) w->wait_send = 1;
917 else w->wait_send = 0;
921 case WEB_CLIENT_MODE_NORMAL:
922 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%d bytes) to client.", w->id, w->data->bytes);
925 case WEB_CLIENT_MODE_FILECOPY:
926 if(w->data->rbytes) {
927 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %d bytes to client.", w->id, w->data->rbytes);
931 // utilize the kernel sendfile() for copying the file to the socket.
932 // this block of code can be commented, without anything missing.
933 // when it is commented, the program will copy the data using async I/O.
935 long len = sendfile(w->ofd, w->ifd, NULL, w->data->rbytes);
936 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);
937 else web_client_reset(w);
942 debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
946 fatal("%llu: Unknown client mode %d.", w->id, w->mode);
951 long web_client_send_chunk_header(struct web_client *w, int len)
953 debug(D_DEFLATE, "%llu: OPEN CHUNK of %d bytes (hex: %x).", w->id, len, len);
955 sprintf(buf, "%X\r\n", len);
956 int bytes = send(w->ofd, buf, strlen(buf), MSG_DONTWAIT);
958 if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk header %d bytes.", w->id, bytes);
959 else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk header to the client.", w->id);
960 else debug(D_DEFLATE, "%llu: Failed to send chunk header to client. Reason: %s", w->id, strerror(errno));
965 long web_client_send_chunk_close(struct web_client *w)
967 //debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
969 int bytes = send(w->ofd, "\r\n", 2, MSG_DONTWAIT);
971 if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
972 else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
973 else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client. Reason: %s", w->id, strerror(errno));
978 long web_client_send_chunk_finalize(struct web_client *w)
980 //debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
982 int bytes = send(w->ofd, "\r\n0\r\n\r\n", 7, MSG_DONTWAIT);
984 if(bytes > 0) debug(D_DEFLATE, "%llu: Sent chunk suffix %d bytes.", w->id, bytes);
985 else if(bytes == 0) debug(D_DEFLATE, "%llu: Did not send chunk suffix to the client.", w->id);
986 else debug(D_DEFLATE, "%llu: Failed to send chunk suffix to client. Reason: %s", w->id, strerror(errno));
991 #ifndef NETDATA_WITHOUT_ZLIB
992 long web_client_send_deflate(struct web_client *w)
994 long bytes = 0, t = 0;
996 // when using compression,
997 // w->data->sent is the amount of bytes passed through compression
999 // 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);
1001 if(w->data->bytes - w->data->sent == 0 && w->zstream.avail_in == 0 && w->zhave == w->zsent && w->zstream.avail_out != 0) {
1002 // there is nothing to send
1004 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1006 // finalize the chunk
1007 if(w->data->sent != 0)
1008 t += web_client_send_chunk_finalize(w);
1010 // there can be two cases for this
1011 // A. we have done everything
1012 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
1014 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->data->rbytes && w->data->rbytes > w->data->bytes) {
1015 // we have to wait, more data will come
1016 debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1021 if(w->keepalive == 0) {
1022 debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->data->sent);
1028 web_client_reset(w);
1029 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
1033 if(w->zstream.avail_out == 0 && w->zhave == w->zsent) {
1034 // compress more input data
1036 // close the previous open chunk
1037 if(w->data->sent != 0) t += web_client_send_chunk_close(w);
1039 debug(D_DEFLATE, "%llu: Compressing %d bytes starting from %d.", w->id, (w->data->bytes - w->data->sent), w->data->sent);
1041 // give the compressor all the data not passed through the compressor yet
1042 if(w->data->bytes > w->data->sent) {
1043 w->zstream.next_in = (Bytef *)&w->data->buffer[w->data->sent];
1044 w->zstream.avail_in = (w->data->bytes - w->data->sent);
1047 // reset the compressor output buffer
1048 w->zstream.next_out = w->zbuffer;
1049 w->zstream.avail_out = ZLIB_CHUNK;
1051 // ask for FINISH if we have all the input
1052 int flush = Z_SYNC_FLUSH;
1053 if(w->mode == WEB_CLIENT_MODE_NORMAL
1054 || (w->mode == WEB_CLIENT_MODE_FILECOPY && w->data->bytes == w->data->rbytes)) {
1056 debug(D_DEFLATE, "%llu: Requesting Z_FINISH.", w->id);
1059 debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
1063 if(deflate(&w->zstream, flush) == Z_STREAM_ERROR) {
1064 error("%llu: Compression failed. Closing down client.", w->id);
1065 web_client_reset(w);
1069 w->zhave = ZLIB_CHUNK - w->zstream.avail_out;
1072 // keep track of the bytes passed through the compressor
1073 w->data->sent = w->data->bytes;
1075 debug(D_DEFLATE, "%llu: Compression produced %d bytes.", w->id, w->zhave);
1078 t += web_client_send_chunk_header(w, w->zhave);
1081 bytes = send(w->ofd, &w->zbuffer[w->zsent], w->zhave - w->zsent, MSG_DONTWAIT);
1084 if(t > 0) bytes += t;
1085 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
1087 else if(bytes == 0) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
1088 else debug(D_WEB_CLIENT, "%llu: Failed to send data to client. Reason: %s", w->id, strerror(errno));
1092 #endif // NETDATA_WITHOUT_ZLIB
1094 long web_client_send(struct web_client *w)
1096 #ifndef NETDATA_WITHOUT_ZLIB
1097 if(likely(w->zoutput)) return web_client_send_deflate(w);
1098 #endif // NETDATA_WITHOUT_ZLIB
1102 if(unlikely(w->data->bytes - w->data->sent == 0)) {
1103 // there is nothing to send
1105 debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
1107 // there can be two cases for this
1108 // A. we have done everything
1109 // B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
1111 if(w->mode == WEB_CLIENT_MODE_FILECOPY && w->wait_receive && w->ifd != w->ofd && w->data->rbytes && w->data->rbytes > w->data->bytes) {
1112 // we have to wait, more data will come
1113 debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
1118 if(unlikely(w->keepalive == 0)) {
1119 debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %ld bytes sent.", w->id, w->data->sent);
1124 web_client_reset(w);
1125 debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
1129 bytes = send(w->ofd, &w->data->buffer[w->data->sent], w->data->bytes - w->data->sent, MSG_DONTWAIT);
1130 if(likely(bytes > 0)) {
1131 w->data->sent += bytes;
1132 debug(D_WEB_CLIENT, "%llu: Sent %d bytes.", w->id, bytes);
1134 else if(likely(bytes == 0)) debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
1135 else debug(D_WEB_CLIENT, "%llu: Failed to send data to client. Reason: %s", w->id, strerror(errno));
1140 long web_client_receive(struct web_client *w)
1142 // do we have any space for more data?
1143 web_buffer_increase(w->data, WEB_DATA_LENGTH_INCREASE_STEP);
1145 long left = w->data->size - w->data->bytes;
1148 if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
1149 bytes = read(w->ifd, &w->data->buffer[w->data->bytes], (left-1));
1151 bytes = recv(w->ifd, &w->data->buffer[w->data->bytes], left-1, MSG_DONTWAIT);
1153 if(likely(bytes > 0)) {
1154 int old = w->data->bytes;
1155 w->data->bytes += bytes;
1156 w->data->buffer[w->data->bytes] = '\0';
1158 debug(D_WEB_CLIENT, "%llu: Received %d bytes.", w->id, bytes);
1159 debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->data->buffer[old]);
1161 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
1163 if(w->data->rbytes && w->data->bytes >= w->data->rbytes) w->wait_receive = 0;
1166 else if(likely(bytes == 0)) {
1167 debug(D_WEB_CLIENT, "%llu: Out of input data.", w->id);
1169 // if we cannot read, it means we have an error on input.
1170 // if however, we are copying a file from ifd to ofd, we should not return an error.
1171 // in this case, the error should be generated when the file has been sent to the client.
1173 if(w->mode == WEB_CLIENT_MODE_FILECOPY) {
1174 // we are copying data from ifd to ofd
1175 // let it finish copying...
1176 w->wait_receive = 0;
1177 debug(D_WEB_CLIENT, "%llu: Disabling input.", w->id);
1189 // --------------------------------------------------------------------------------------
1190 // the thread of a single client
1192 // 1. waits for input and output, using async I/O
1193 // 2. it processes HTTP requests
1194 // 3. it generates HTTP responses
1195 // 4. it copies data from input to output if mode is FILECOPY
1197 void *web_client_main(void *ptr)
1199 if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)
1200 error("Cannot set pthread cancel type to DEFERRED.");
1202 if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)
1203 error("Cannot set pthread cancel state to ENABLE.");
1206 struct web_client *w = ptr;
1208 fd_set ifds, ofds, efds;
1211 log_access("%llu: %s port %s connected on thread task id %d", w->id, w->client_ip, w->client_port, gettid());
1218 FD_SET(w->ifd, &efds);
1220 if(w->ifd != w->ofd)
1221 FD_SET(w->ofd, &efds);
1223 if (w->wait_receive) {
1224 FD_SET(w->ifd, &ifds);
1225 if(w->ifd > fdmax) fdmax = w->ifd;
1229 FD_SET(w->ofd, &ofds);
1230 if(w->ofd > fdmax) fdmax = w->ofd;
1233 tv.tv_sec = web_client_timeout;
1236 debug(D_WEB_CLIENT, "%llu: Waiting socket async I/O for %s %s", w->id, w->wait_receive?"INPUT":"", w->wait_send?"OUTPUT":"");
1237 retval = select(fdmax+1, &ifds, &ofds, &efds, &tv);
1240 debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: select() failed.", w->id);
1245 debug(D_WEB_CLIENT_ACCESS, "%llu: LISTENER: timeout.", w->id);
1249 if(FD_ISSET(w->ifd, &efds)) {
1250 debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on input socket (%s).", w->id, strerror(errno));
1254 if(FD_ISSET(w->ofd, &efds)) {
1255 debug(D_WEB_CLIENT_ACCESS, "%llu: Received error on output socket (%s).", w->id, strerror(errno));
1259 if(w->wait_send && FD_ISSET(w->ofd, &ofds)) {
1261 if((bytes = web_client_send(w)) < 0) {
1262 debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client (ouput: %s).", w->id, strerror(errno));
1267 global_statistics_lock();
1268 global_statistics.bytes_sent += bytes;
1269 global_statistics_unlock();
1272 if(w->wait_receive && FD_ISSET(w->ifd, &ifds)) {
1274 if((bytes = web_client_receive(w)) < 0) {
1275 debug(D_WEB_CLIENT, "%llu: Cannot receive data from client. Closing client (input: %s).", w->id, strerror(errno));
1280 global_statistics_lock();
1281 global_statistics.bytes_received += bytes;
1282 global_statistics_unlock();
1284 if(w->mode == WEB_CLIENT_MODE_NORMAL) {
1285 debug(D_WEB_CLIENT, "%llu: Attempting to process received data.", w->id);
1286 web_client_process(w);
1291 log_access("%llu: %s port %s disconnected from thread task id %d", w->id, w->client_ip, w->client_port, gettid());
1292 debug(D_WEB_CLIENT, "%llu: done...", w->id);
1294 web_client_reset(w);