// SPDX-License-Identifier: GPL-3.0-or-later
#include "web_client.h"
// this is an async I/O implementation of the web server request parser
// it is used by all netdata web servers
int respect_web_browser_do_not_track_policy = 0;
char *web_x_frame_options = NULL;
int web_enable_gzip = 1, web_gzip_level = 3, web_gzip_strategy = Z_DEFAULT_STRATEGY;
inline int web_client_permission_denied(struct web_client *w) {
w->response.data->content_type = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "You are not allowed to access this resource.");
w->response.code = HTTP_RESP_FORBIDDEN;
return HTTP_RESP_FORBIDDEN;
}
inline int web_client_bearer_required(struct web_client *w) {
w->response.data->content_type = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "An authorization bearer is required to access the resource.");
w->response.code = HTTP_RESP_UNAUTHORIZED;
return HTTP_RESP_UNAUTHORIZED;
}
static inline int bad_request_multiple_dashboard_versions(struct web_client *w) {
w->response.data->content_type = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Multiple dashboard versions given at the URL.");
w->response.code = HTTP_RESP_BAD_REQUEST;
return HTTP_RESP_BAD_REQUEST;
}
static inline int web_client_cork_socket(struct web_client *w __maybe_unused) {
#ifdef TCP_CORK
if(likely(web_client_is_corkable(w) && !w->tcp_cork && w->ofd != -1)) {
w->tcp_cork = true;
if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
netdata_log_error("%llu: failed to enable TCP_CORK on socket.", w->id);
w->tcp_cork = false;
return -1;
}
}
#endif /* TCP_CORK */
return 0;
}
static inline void web_client_enable_wait_from_ssl(struct web_client *w) {
if (w->ssl.ssl_errno == SSL_ERROR_WANT_READ)
web_client_enable_ssl_wait_receive(w);
else if (w->ssl.ssl_errno == SSL_ERROR_WANT_WRITE)
web_client_enable_ssl_wait_send(w);
else {
web_client_disable_ssl_wait_receive(w);
web_client_disable_ssl_wait_send(w);
}
}
static inline int web_client_uncork_socket(struct web_client *w __maybe_unused) {
#ifdef TCP_CORK
if(likely(w->tcp_cork && w->ofd != -1)) {
w->tcp_cork = false;
if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
netdata_log_error("%llu: failed to disable TCP_CORK on socket.", w->id);
w->tcp_cork = true;
return -1;
}
}
#endif /* TCP_CORK */
w->tcp_cork = false;
return 0;
}
char *strip_control_characters(char *url) {
char *s = url;
if(!s) return "";
if(iscntrl(*s)) *s = ' ';
while(*++s) {
if(iscntrl(*s)) *s = ' ';
}
return url;
}
static void web_client_reset_allocations(struct web_client *w, bool free_all) {
if(free_all) {
// the web client is to be destroyed
buffer_free(w->url_as_received);
w->url_as_received = NULL;
buffer_free(w->url_path_decoded);
w->url_path_decoded = NULL;
buffer_free(w->url_query_string_decoded);
w->url_query_string_decoded = NULL;
buffer_free(w->response.header_output);
w->response.header_output = NULL;
buffer_free(w->response.header);
w->response.header = NULL;
buffer_free(w->response.data);
w->response.data = NULL;
freez(w->post_payload);
w->post_payload = NULL;
w->post_payload_size = 0;
}
else {
// the web client is to be re-used
buffer_reset(w->url_as_received);
buffer_reset(w->url_path_decoded);
buffer_reset(w->url_query_string_decoded);
buffer_reset(w->response.header_output);
buffer_reset(w->response.header);
buffer_reset(w->response.data);
// leave w->post_payload
}
freez(w->server_host);
w->server_host = NULL;
freez(w->forwarded_host);
w->forwarded_host = NULL;
freez(w->origin);
w->origin = NULL;
freez(w->user_agent);
w->user_agent = NULL;
freez(w->auth_bearer_token);
w->auth_bearer_token = NULL;
// if we had enabled compression, release it
if(w->response.zinitialized) {
deflateEnd(&w->response.zstream);
w->response.zsent = 0;
w->response.zhave = 0;
w->response.zstream.avail_in = 0;
w->response.zstream.avail_out = 0;
w->response.zstream.total_in = 0;
w->response.zstream.total_out = 0;
w->response.zinitialized = false;
w->flags &= ~WEB_CLIENT_CHUNKED_TRANSFER;
}
web_client_reset_path_flags(w);
}
void web_client_request_done(struct web_client *w) {
web_client_uncork_socket(w);
netdata_log_debug(D_WEB_CLIENT, "%llu: Resetting client.", w->id);
if(likely(buffer_strlen(w->url_as_received))) {
struct timeval tv;
now_monotonic_high_precision_timeval(&tv);
size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
size_t sent = size;
if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
// --------------------------------------------------------------------
// global statistics
global_statistics_web_request_completed(dt_usec(&tv, &w->timings.tv_in),
w->statistics.received_bytes,
w->statistics.sent_bytes,
size,
sent);
w->statistics.received_bytes = 0;
w->statistics.sent_bytes = 0;
// --------------------------------------------------------------------
const char *mode;
switch(w->mode) {
case WEB_CLIENT_MODE_FILECOPY:
mode = "FILECOPY";
break;
case WEB_CLIENT_MODE_OPTIONS:
mode = "OPTIONS";
break;
case WEB_CLIENT_MODE_STREAM:
mode = "STREAM";
break;
case WEB_CLIENT_MODE_POST:
case WEB_CLIENT_MODE_GET:
mode = "DATA";
break;
default:
mode = "UNKNOWN";
break;
}
// access log
netdata_log_access("%llu: %d '[%s]:%s' '%s' (sent/all = %zu/%zu bytes %0.0f%%, prep/sent/total = %0.2f/%0.2f/%0.2f ms) %d '%s'",
w->id
, gettid()
, w->client_ip
, w->client_port
, mode
, sent
, size
, -((size > 0) ? ((double)(size - sent) / (double) size * 100.0) : 0.0)
, (double)dt_usec(&w->timings.tv_ready, &w->timings.tv_in) / 1000.0
, (double)dt_usec(&tv, &w->timings.tv_ready) / 1000.0
, (double)dt_usec(&tv, &w->timings.tv_in) / 1000.0
, w->response.code
, strip_control_characters((char *)buffer_tostring(w->url_as_received))
);
}
if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
if(w->ifd != w->ofd) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Closing filecopy input file descriptor %d.", w->id, w->ifd);
if(web_server_mode != WEB_SERVER_MODE_STATIC_THREADED) {
if (w->ifd != -1){
close(w->ifd);
}
}
w->ifd = w->ofd;
}
}
web_client_reset_allocations(w, false);
w->mode = WEB_CLIENT_MODE_GET;
web_client_disable_donottrack(w);
web_client_disable_tracking_required(w);
web_client_disable_keepalive(w);
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_enable_wait_receive(w);
web_client_disable_wait_send(w);
w->response.has_cookies = false;
w->response.rlen = 0;
w->response.sent = 0;
w->response.code = 0;
w->response.zoutput = false;
}
static struct {
const char *extension;
uint32_t hash;
uint8_t contenttype;
} mime_types[] = {
{ "html" , 0 , CT_TEXT_HTML}
, {"js" , 0 , CT_APPLICATION_X_JAVASCRIPT}
, {"css" , 0 , CT_TEXT_CSS}
, {"xml" , 0 , CT_TEXT_XML}
, {"xsl" , 0 , CT_TEXT_XSL}
, {"txt" , 0 , CT_TEXT_PLAIN}
, {"svg" , 0 , CT_IMAGE_SVG_XML}
, {"ttf" , 0 , CT_APPLICATION_X_FONT_TRUETYPE}
, {"otf" , 0 , CT_APPLICATION_X_FONT_OPENTYPE}
, {"woff2", 0 , CT_APPLICATION_FONT_WOFF2}
, {"woff" , 0 , CT_APPLICATION_FONT_WOFF}
, {"eot" , 0 , CT_APPLICATION_VND_MS_FONTOBJ}
, {"png" , 0 , CT_IMAGE_PNG}
, {"jpg" , 0 , CT_IMAGE_JPG}
, {"jpeg" , 0 , CT_IMAGE_JPG}
, {"gif" , 0 , CT_IMAGE_GIF}
, {"bmp" , 0 , CT_IMAGE_BMP}
, {"ico" , 0 , CT_IMAGE_XICON}
, {"icns" , 0 , CT_IMAGE_ICNS}
, { NULL, 0, 0}
};
static inline uint8_t contenttype_for_filename(const char *filename) {
// netdata_log_info("checking filename '%s'", filename);
static int initialized = 0;
int i;
if(unlikely(!initialized)) {
for (i = 0; mime_types[i].extension; i++)
mime_types[i].hash = simple_hash(mime_types[i].extension);
initialized = 1;
}
const char *s = filename, *last_dot = NULL;
// find the last dot
while(*s) {
if(unlikely(*s == '.')) last_dot = s;
s++;
}
if(unlikely(!last_dot || !*last_dot || !last_dot[1])) {
// netdata_log_info("no extension for filename '%s'", filename);
return CT_APPLICATION_OCTET_STREAM;
}
last_dot++;
// netdata_log_info("extension for filename '%s' is '%s'", filename, last_dot);
uint32_t hash = simple_hash(last_dot);
for(i = 0; mime_types[i].extension ; i++) {
if(unlikely(hash == mime_types[i].hash && !strcmp(last_dot, mime_types[i].extension))) {
// netdata_log_info("matched extension for filename '%s': '%s'", filename, last_dot);
return mime_types[i].contenttype;
}
}
// netdata_log_info("not matched extension for filename '%s': '%s'", filename, last_dot);
return CT_APPLICATION_OCTET_STREAM;
}
static int append_slash_to_url_and_redirect(struct web_client *w) {
// this function returns a relative redirect
// it finds the last path component on the URL and just appends / to it
//
// So, if the URL is:
//
// /path/to/file?query_string
//
// It adds a Location header like this:
//
// Location: file/?query_string\r\n
//
// The web browser already knows that it is inside /path/to/
// so it converts the path to /path/to/file/ and executes the
// request again.
buffer_strcat(w->response.header, "Location: ");
const char *b = buffer_tostring(w->url_as_received);
const char *q = strchr(b, '?');
if(q && q > b) {
const char *e = q - 1;
while(e > b && *e != '/') e--;
if(*e == '/') e++;
size_t len = q - e;
buffer_strncat(w->response.header, e, len);
buffer_strncat(w->response.header, "/", 1);
buffer_strcat(w->response.header, q);
}
else {
const char *e = &b[buffer_strlen(w->url_as_received) - 1];
while(e > b && *e != '/') e--;
if(*e == '/') e++;
buffer_strcat(w->response.header, e);
buffer_strncat(w->response.header, "/", 1);
}
buffer_strncat(w->response.header, "\r\n", 2);
w->response.data->content_type = CT_TEXT_HTML;
buffer_flush(w->response.data);
buffer_strcat(w->response.data,
""
""
"Redirecting. In case your browser does not support redirection, please click "
"here."
"");
return HTTP_RESP_MOVED_PERM;
}
// Work around a bug in the CMocka library by removing this function during testing.
#ifndef REMOVE_MYSENDFILE
static inline int dashboard_version(struct web_client *w) {
if(!web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_WITH_VERSION))
return -1;
if(web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_IS_V0))
return 0;
if(web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_IS_V1))
return 1;
if(web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_IS_V2))
return 2;
return -1;
}
static bool find_filename_to_serve(const char *filename, char *dst, size_t dst_len, struct stat *statbuf, struct web_client *w, bool *is_dir) {
int d_version = dashboard_version(w);
bool has_extension = web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_HAS_FILE_EXTENSION);
int fallback = 0;
if(has_extension) {
if(d_version == -1)
snprintfz(dst, dst_len, "%s/%s", netdata_configured_web_dir, filename);
else {
// check if the filename or directory exists
// fallback to the same path without the dashboard version otherwise
snprintfz(dst, dst_len, "%s/v%d/%s", netdata_configured_web_dir, d_version, filename);
fallback = 1;
}
}
else if(d_version != -1) {
if(filename && *filename) {
// check if the filename exists
// fallback to /vN/index.html otherwise
snprintfz(dst, dst_len, "%s/%s", netdata_configured_web_dir, filename);
fallback = 2;
}
else {
if(filename && *filename)
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_HAS_TRAILING_SLASH);
snprintfz(dst, dst_len, "%s/v%d", netdata_configured_web_dir, d_version);
}
}
else {
// check if filename exists
// this is needed to serve {filename}/index.html, in case a user puts a html file into a directory
// fallback to /index.html otherwise
snprintfz(dst, dst_len, "%s/%s", netdata_configured_web_dir, filename);
fallback = 3;
}
if (stat(dst, statbuf) != 0) {
if(fallback == 1) {
snprintfz(dst, dst_len, "%s/%s", netdata_configured_web_dir, filename);
if (stat(dst, statbuf) != 0)
return false;
}
else if(fallback == 2) {
if(filename && *filename)
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_HAS_TRAILING_SLASH);
snprintfz(dst, dst_len, "%s/v%d", netdata_configured_web_dir, d_version);
if (stat(dst, statbuf) != 0)
return false;
}
else if(fallback == 3) {
if(filename && *filename)
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_HAS_TRAILING_SLASH);
snprintfz(dst, dst_len, "%s", netdata_configured_web_dir);
if (stat(dst, statbuf) != 0)
return false;
}
else
return false;
}
if((statbuf->st_mode & S_IFMT) == S_IFDIR) {
size_t len = strlen(dst);
if(len > dst_len - 11)
return false;
strncpyz(&dst[len], "/index.html", dst_len - len);
if (stat(dst, statbuf) != 0)
return false;
*is_dir = true;
}
return true;
}
static int mysendfile(struct web_client *w, char *filename) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Looking for file '%s/%s'", w->id, netdata_configured_web_dir, filename);
if(!web_client_can_access_dashboard(w))
return web_client_permission_denied(w);
// skip leading slashes
while (*filename == '/') filename++;
// if the filename contains "strange" characters, refuse to serve it
char *s;
for(s = filename; *s ;s++) {
if( !isalnum(*s) && *s != '/' && *s != '.' && *s != '-' && *s != '_') {
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
w->response.data->content_type = CT_TEXT_HTML;
buffer_sprintf(w->response.data, "Filename contains invalid characters: ");
buffer_strcat_htmlescape(w->response.data, filename);
return HTTP_RESP_BAD_REQUEST;
}
}
// if the filename contains a double dot refuse to serve it
if(strstr(filename, "..") != 0) {
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Relative filenames are not supported: ");
buffer_strcat_htmlescape(w->response.data, filename);
return HTTP_RESP_BAD_REQUEST;
}
// find the physical file on disk
bool is_dir = false;
char web_filename[FILENAME_MAX + 1];
struct stat statbuf;
if(!find_filename_to_serve(filename, web_filename, FILENAME_MAX, &statbuf, w, &is_dir)) {
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data, "File does not exist, or is not accessible: ");
buffer_strcat_htmlescape(w->response.data, web_filename);
return HTTP_RESP_NOT_FOUND;
}
if(is_dir && !web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_HAS_TRAILING_SLASH))
return append_slash_to_url_and_redirect(w);
// open the file
w->ifd = open(web_filename, O_NONBLOCK, O_RDONLY);
if(w->ifd == -1) {
w->ifd = w->ofd;
if(errno == EBUSY || errno == EAGAIN) {
netdata_log_error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, web_filename);
w->response.data->content_type = CT_TEXT_HTML;
buffer_sprintf(w->response.header, "Location: /%s\r\n", filename);
buffer_strcat(w->response.data, "File is currently busy, please try again later: ");
buffer_strcat_htmlescape(w->response.data, web_filename);
return HTTP_RESP_REDIR_TEMP;
}
else {
netdata_log_error("%llu: Cannot open file '%s'.", w->id, web_filename);
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Cannot open file: ");
buffer_strcat_htmlescape(w->response.data, web_filename);
return HTTP_RESP_NOT_FOUND;
}
}
sock_setnonblock(w->ifd);
w->response.data->content_type = contenttype_for_filename(web_filename);
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: Sending file '%s' (%"PRId64" bytes, ifd %d, ofd %d).", w->id, web_filename, (int64_t)statbuf.st_size, w->ifd, w->ofd);
w->mode = WEB_CLIENT_MODE_FILECOPY;
web_client_enable_wait_receive(w);
web_client_disable_wait_send(w);
buffer_flush(w->response.data);
buffer_need_bytes(w->response.data, (size_t)statbuf.st_size);
w->response.rlen = (size_t)statbuf.st_size;
#ifdef __APPLE__
w->response.data->date = statbuf.st_mtimespec.tv_sec;
#else
w->response.data->date = statbuf.st_mtim.tv_sec;
#endif
buffer_cacheable(w->response.data);
return HTTP_RESP_OK;
}
#endif
void web_client_enable_deflate(struct web_client *w, int gzip) {
if(unlikely(w->response.zinitialized)) {
netdata_log_debug(D_DEFLATE, "%llu: Compression has already be initialized for this client.", w->id);
return;
}
if(unlikely(w->response.sent)) {
netdata_log_error("%llu: Cannot enable compression in the middle of a conversation.", w->id);
return;
}
w->response.zstream.zalloc = Z_NULL;
w->response.zstream.zfree = Z_NULL;
w->response.zstream.opaque = Z_NULL;
w->response.zstream.next_in = (Bytef *)w->response.data->buffer;
w->response.zstream.avail_in = 0;
w->response.zstream.total_in = 0;
w->response.zstream.next_out = w->response.zbuffer;
w->response.zstream.avail_out = 0;
w->response.zstream.total_out = 0;
w->response.zstream.zalloc = Z_NULL;
w->response.zstream.zfree = Z_NULL;
w->response.zstream.opaque = Z_NULL;
// if(deflateInit(&w->response.zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
// netdata_log_error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
// return;
// }
// Select GZIP compression: windowbits = 15 + 16 = 31
if(deflateInit2(&w->response.zstream, web_gzip_level, Z_DEFLATED, 15 + ((gzip)?16:0), 8, web_gzip_strategy) != Z_OK) {
netdata_log_error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
return;
}
w->response.zsent = 0;
w->response.zoutput = true;
w->response.zinitialized = true;
w->flags |= WEB_CLIENT_CHUNKED_TRANSFER;
netdata_log_debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
}
void buffer_data_options2string(BUFFER *wb, uint32_t options) {
int count = 0;
if(options & RRDR_OPTION_NONZERO) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "nonzero");
}
if(options & RRDR_OPTION_REVERSED) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "flip");
}
if(options & RRDR_OPTION_JSON_WRAP) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "jsonwrap");
}
if(options & RRDR_OPTION_MIN2MAX) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "min2max");
}
if(options & RRDR_OPTION_MILLISECONDS) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "ms");
}
if(options & RRDR_OPTION_ABSOLUTE) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "absolute");
}
if(options & RRDR_OPTION_SECONDS) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "seconds");
}
if(options & RRDR_OPTION_NULL2ZERO) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "null2zero");
}
if(options & RRDR_OPTION_OBJECTSROWS) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "objectrows");
}
if(options & RRDR_OPTION_GOOGLE_JSON) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "google_json");
}
if(options & RRDR_OPTION_PERCENTAGE) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "percentage");
}
if(options & RRDR_OPTION_NOT_ALIGNED) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "unaligned");
}
if(options & RRDR_OPTION_ANOMALY_BIT) {
if(count++) buffer_strcat(wb, " ");
buffer_strcat(wb, "anomaly-bit");
}
}
static inline int check_host_and_call(RRDHOST *host, struct web_client *w, char *url, int (*func)(RRDHOST *, struct web_client *, char *)) {
//if(unlikely(host->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
// buffer_flush(w->response.data);
// buffer_strcat(w->response.data, "This host does not maintain a database");
// return HTTP_RESP_BAD_REQUEST;
//}
return func(host, w, url);
}
static inline int UNUSED_FUNCTION(check_host_and_dashboard_acl_and_call)(RRDHOST *host, struct web_client *w, char *url, int (*func)(RRDHOST *, struct web_client *, char *)) {
if(!web_client_can_access_dashboard(w))
return web_client_permission_denied(w);
return check_host_and_call(host, w, url, func);
}
static inline int UNUSED_FUNCTION(check_host_and_mgmt_acl_and_call)(RRDHOST *host, struct web_client *w, char *url, int (*func)(RRDHOST *, struct web_client *, char *)) {
if(!web_client_can_access_mgmt(w))
return web_client_permission_denied(w);
return check_host_and_call(host, w, url, func);
}
int web_client_api_request(RRDHOST *host, struct web_client *w, char *url_path_fragment)
{
// get the api version
char *tok = strsep_skip_consecutive_separators(&url_path_fragment, "/");
if(tok && *tok) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
if(strcmp(tok, "v2") == 0)
return web_client_api_request_v2(host, w, url_path_fragment);
else if(strcmp(tok, "v1") == 0)
return web_client_api_request_v1(host, w, url_path_fragment);
else {
buffer_flush(w->response.data);
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Unsupported API version: ");
buffer_strcat_htmlescape(w->response.data, tok);
return HTTP_RESP_NOT_FOUND;
}
}
else {
buffer_flush(w->response.data);
buffer_sprintf(w->response.data, "Which API version?");
return HTTP_RESP_BAD_REQUEST;
}
}
const char *web_content_type_to_string(HTTP_CONTENT_TYPE content_type) {
switch(content_type) {
case CT_TEXT_HTML:
return "text/html; charset=utf-8";
case CT_APPLICATION_XML:
return "application/xml; charset=utf-8";
case CT_APPLICATION_JSON:
return "application/json; charset=utf-8";
case CT_APPLICATION_X_JAVASCRIPT:
return "application/javascript; charset=utf-8";
case CT_TEXT_CSS:
return "text/css; charset=utf-8";
case CT_TEXT_XML:
return "text/xml; charset=utf-8";
case CT_TEXT_XSL:
return "text/xsl; charset=utf-8";
case CT_APPLICATION_OCTET_STREAM:
return "application/octet-stream";
case CT_IMAGE_SVG_XML:
return "image/svg+xml";
case CT_APPLICATION_X_FONT_TRUETYPE:
return "application/x-font-truetype";
case CT_APPLICATION_X_FONT_OPENTYPE:
return "application/x-font-opentype";
case CT_APPLICATION_FONT_WOFF:
return "application/font-woff";
case CT_APPLICATION_FONT_WOFF2:
return "application/font-woff2";
case CT_APPLICATION_VND_MS_FONTOBJ:
return "application/vnd.ms-fontobject";
case CT_IMAGE_PNG:
return "image/png";
case CT_IMAGE_JPG:
return "image/jpeg";
case CT_IMAGE_GIF:
return "image/gif";
case CT_IMAGE_XICON:
return "image/x-icon";
case CT_IMAGE_BMP:
return "image/bmp";
case CT_IMAGE_ICNS:
return "image/icns";
case CT_PROMETHEUS:
return "text/plain; version=0.0.4";
case CT_AUDIO_MPEG:
return "audio/mpeg";
case CT_AUDIO_OGG:
return "audio/ogg";
case CT_VIDEO_MP4:
return "video/mp4";
case CT_APPLICATION_PDF:
return "application/pdf";
case CT_APPLICATION_ZIP:
return "application/zip";
default:
case CT_TEXT_PLAIN:
return "text/plain; charset=utf-8";
}
}
const char *web_response_code_to_string(int code) {
switch(code) {
case 100:
return "Continue";
case 101:
return "Switching Protocols";
case 102:
return "Processing";
case 103:
return "Early Hints";
case 200:
return "OK";
case 201:
return "Created";
case 202:
return "Accepted";
case 203:
return "Non-Authoritative Information";
case 204:
return "No Content";
case 205:
return "Reset Content";
case 206:
return "Partial Content";
case 207:
return "Multi-Status";
case 208:
return "Already Reported";
case 226:
return "IM Used";
case 300:
return "Multiple Choices";
case 301:
return "Moved Permanently";
case 302:
return "Found";
case 303:
return "See Other";
case 304:
return "Not Modified";
case 305:
return "Use Proxy";
case 306:
return "Switch Proxy";
case 307:
return "Temporary Redirect";
case 308:
return "Permanent Redirect";
case 400:
return "Bad Request";
case 401:
return "Unauthorized";
case 402:
return "Payment Required";
case 403:
return "Forbidden";
case 404:
return "Not Found";
case 405:
return "Method Not Allowed";
case 406:
return "Not Acceptable";
case 407:
return "Proxy Authentication Required";
case 408:
return "Request Timeout";
case 409:
return "Conflict";
case 410:
return "Gone";
case 411:
return "Length Required";
case 412:
return "Precondition Failed";
case 413:
return "Payload Too Large";
case 414:
return "URI Too Long";
case 415:
return "Unsupported Media Type";
case 416:
return "Range Not Satisfiable";
case 417:
return "Expectation Failed";
case 418:
return "I'm a teapot";
case 421:
return "Misdirected Request";
case 422:
return "Unprocessable Entity";
case 423:
return "Locked";
case 424:
return "Failed Dependency";
case 425:
return "Too Early";
case 426:
return "Upgrade Required";
case 428:
return "Precondition Required";
case 429:
return "Too Many Requests";
case 431:
return "Request Header Fields Too Large";
case 451:
return "Unavailable For Legal Reasons";
case 500:
return "Internal Server Error";
case 501:
return "Not Implemented";
case 502:
return "Bad Gateway";
case 503:
return "Service Unavailable";
case 504:
return "Gateway Timeout";
case 505:
return "HTTP Version Not Supported";
case 506:
return "Variant Also Negotiates";
case 507:
return "Insufficient Storage";
case 508:
return "Loop Detected";
case 510:
return "Not Extended";
case 511:
return "Network Authentication Required";
default:
if(code >= 100 && code < 200)
return "Informational";
if(code >= 200 && code < 300)
return "Successful";
if(code >= 300 && code < 400)
return "Redirection";
if(code >= 400 && code < 500)
return "Client Error";
if(code >= 500 && code < 600)
return "Server Error";
return "Undefined Error";
}
}
static inline char *http_header_parse(struct web_client *w, char *s, int parse_useragent) {
static uint32_t hash_origin = 0, hash_connection = 0, hash_donottrack = 0, hash_useragent = 0,
hash_authorization = 0, hash_host = 0, hash_forwarded_host = 0;
static uint32_t hash_accept_encoding = 0;
if(unlikely(!hash_origin)) {
hash_origin = simple_uhash("Origin");
hash_connection = simple_uhash("Connection");
hash_accept_encoding = simple_uhash("Accept-Encoding");
hash_donottrack = simple_uhash("DNT");
hash_useragent = simple_uhash("User-Agent");
hash_authorization = simple_uhash("X-Auth-Token");
hash_host = simple_uhash("Host");
hash_forwarded_host = simple_uhash("X-Forwarded-Host");
}
char *e = s;
// find the :
while(*e && *e != ':') e++;
if(!*e) return e;
// get the name
*e = '\0';
// find the value
char *v = e + 1, *ve;
// skip leading spaces from value
while(*v == ' ') v++;
ve = v;
// find the \r
while(*ve && *ve != '\r') ve++;
if(!*ve || ve[1] != '\n') {
*e = ':';
return ve;
}
// terminate the value
*ve = '\0';
uint32_t hash = simple_uhash(s);
if(hash == hash_origin && !strcasecmp(s, "Origin"))
w->origin = strdupz(v);
else if(hash == hash_connection && !strcasecmp(s, "Connection")) {
if(strcasestr(v, "keep-alive"))
web_client_enable_keepalive(w);
}
else if(respect_web_browser_do_not_track_policy && hash == hash_donottrack && !strcasecmp(s, "DNT")) {
if(*v == '0') web_client_disable_donottrack(w);
else if(*v == '1') web_client_enable_donottrack(w);
}
else if(parse_useragent && hash == hash_useragent && !strcasecmp(s, "User-Agent")) {
w->user_agent = strdupz(v);
}
else if(hash == hash_authorization&& !strcasecmp(s, "X-Auth-Token")) {
w->auth_bearer_token = strdupz(v);
}
else if(hash == hash_host && !strcasecmp(s, "Host")) {
char buffer[NI_MAXHOST];
strncpyz(buffer, v, ((size_t)(ve - v) < sizeof(buffer) - 1 ? (size_t)(ve - v) : sizeof(buffer) - 1));
w->server_host = strdupz(buffer);
}
else if(hash == hash_accept_encoding && !strcasecmp(s, "Accept-Encoding")) {
if(web_enable_gzip) {
if(strcasestr(v, "gzip"))
web_client_enable_deflate(w, 1);
//
// does not seem to work
// else if(strcasestr(v, "deflate"))
// web_client_enable_deflate(w, 0);
}
}
else if(hash == hash_forwarded_host && !strcasecmp(s, "X-Forwarded-Host")) {
char buffer[NI_MAXHOST];
strncpyz(buffer, v, ((size_t)(ve - v) < sizeof(buffer) - 1 ? (size_t)(ve - v) : sizeof(buffer) - 1));
w->forwarded_host = strdupz(buffer);
}
*e = ':';
*ve = '\r';
return ve;
}
/**
* Valid Method
*
* Netdata accepts only three methods, including one of these three(STREAM) is an internal method.
*
* @param w is the structure with the client request
* @param s is the start string to parse
*
* @return it returns the next address to parse case the method is valid and NULL otherwise.
*/
static inline char *web_client_valid_method(struct web_client *w, char *s) {
// is is a valid request?
if(!strncmp(s, "GET ", 4)) {
s = &s[4];
w->mode = WEB_CLIENT_MODE_GET;
}
else if(!strncmp(s, "OPTIONS ", 8)) {
s = &s[8];
w->mode = WEB_CLIENT_MODE_OPTIONS;
}
else if(!strncmp(s, "POST ", 5)) {
s = &s[5];
w->mode = WEB_CLIENT_MODE_POST;
}
else if(!strncmp(s, "STREAM ", 7)) {
s = &s[7];
#ifdef ENABLE_HTTPS
if (!SSL_connection(&w->ssl) && web_client_is_using_ssl_force(w)) {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
char hostname[256];
char *copyme = strstr(s,"hostname=");
if ( copyme ){
copyme += 9;
char *end = strchr(copyme,'&');
if(end){
size_t length = MIN(255, end - copyme);
memcpy(hostname,copyme,length);
hostname[length] = 0X00;
}
else{
memcpy(hostname,"not available",13);
hostname[13] = 0x00;
}
}
else{
memcpy(hostname,"not available",13);
hostname[13] = 0x00;
}
netdata_log_error("The server is configured to always use encrypted connections, please enable the SSL on child with hostname '%s'.",hostname);
s = NULL;
}
#endif
w->mode = WEB_CLIENT_MODE_STREAM;
}
else {
s = NULL;
}
return s;
}
/**
* Request validate
*
* @param w is the structure with the client request
*
* @return It returns HTTP_VALIDATION_OK on success and another code present
* in the enum HTTP_VALIDATION otherwise.
*/
static inline HTTP_VALIDATION http_request_validate(struct web_client *w) {
char *s = (char *)buffer_tostring(w->response.data), *encoded_url = NULL;
size_t last_pos = w->header_parse_last_size;
w->header_parse_tries++;
w->header_parse_last_size = buffer_strlen(w->response.data);
int is_it_valid;
if(w->header_parse_tries > 1) {
if(last_pos > 4) last_pos -= 4; // allow searching for \r\n\r\n
else last_pos = 0;
if(w->header_parse_last_size < last_pos)
last_pos = 0;
is_it_valid = url_is_request_complete(s, &s[last_pos], w->header_parse_last_size, &w->post_payload, &w->post_payload_size);
if(!is_it_valid) {
if(w->header_parse_tries > HTTP_REQ_MAX_HEADER_FETCH_TRIES) {
netdata_log_info("Disabling slow client after %zu attempts to read the request (%zu bytes received)", w->header_parse_tries, buffer_strlen(w->response.data));
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
return HTTP_VALIDATION_TOO_MANY_READ_RETRIES;
}
return HTTP_VALIDATION_INCOMPLETE;
}
is_it_valid = 1;
} else {
last_pos = w->header_parse_last_size;
is_it_valid = url_is_request_complete(s, &s[last_pos], w->header_parse_last_size, &w->post_payload, &w->post_payload_size);
}
s = web_client_valid_method(w, s);
if (!s) {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
return HTTP_VALIDATION_NOT_SUPPORTED;
} else if (!is_it_valid) {
//Invalid request, we have more data after the end of message
char *check = strstr((char *)buffer_tostring(w->response.data), "\r\n\r\n");
if(check) {
check += 4;
if (*check) {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
return HTTP_VALIDATION_EXCESS_REQUEST_DATA;
}
}
web_client_enable_wait_receive(w);
return HTTP_VALIDATION_INCOMPLETE;
}
//After the method we have the path and query string together
encoded_url = s;
//we search for the position where we have " HTTP/", because it finishes the user request
s = url_find_protocol(s);
// incomplete requests
if(unlikely(!*s)) {
web_client_enable_wait_receive(w);
return HTTP_VALIDATION_INCOMPLETE;
}
// we have the end of encoded_url - remember it
char *ue = s;
// make sure we have complete request
// complete requests contain: \r\n\r\n
while(*s) {
// find a line feed
while(*s && *s++ != '\r');
// did we reach the end?
if(unlikely(!*s)) break;
// is it \r\n ?
if(likely(*s++ == '\n')) {
// is it again \r\n ? (header end)
if(unlikely(*s == '\r' && s[1] == '\n')) {
// a valid complete HTTP request found
char c = *ue;
*ue = '\0';
web_client_decode_path_and_query_string(w, encoded_url);
*ue = c;
#ifdef ENABLE_HTTPS
if ( (!web_client_check_unix(w)) && (netdata_ssl_web_server_ctx) ) {
if (!w->ssl.conn && (web_client_is_using_ssl_force(w) || web_client_is_using_ssl_default(w)) && (w->mode != WEB_CLIENT_MODE_STREAM)) {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
return HTTP_VALIDATION_REDIRECT;
}
}
#endif
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
return HTTP_VALIDATION_OK;
}
// another header line
s = http_header_parse(w, s, (w->mode == WEB_CLIENT_MODE_STREAM)); // parse user agent
}
}
// incomplete request
web_client_enable_wait_receive(w);
return HTTP_VALIDATION_INCOMPLETE;
}
static inline ssize_t web_client_send_data(struct web_client *w,const void *buf,size_t len, int flags)
{
ssize_t bytes;
#ifdef ENABLE_HTTPS
if ((!web_client_check_unix(w)) && (netdata_ssl_web_server_ctx)) {
if (SSL_connection(&w->ssl)) {
bytes = netdata_ssl_write(&w->ssl, buf, len) ;
web_client_enable_wait_from_ssl(w);
}
else
bytes = send(w->ofd,buf, len , flags);
} else
bytes = send(w->ofd,buf, len , flags);
#else
bytes = send(w->ofd, buf, len, flags);
#endif
return bytes;
}
void web_client_build_http_header(struct web_client *w) {
if(unlikely(w->response.code != HTTP_RESP_OK))
buffer_no_cacheable(w->response.data);
if(unlikely(!w->response.data->date))
w->response.data->date = now_realtime_sec();
// set a proper expiration date, if not already set
if(unlikely(!w->response.data->expires)) {
if(w->response.data->options & WB_CONTENT_NO_CACHEABLE)
w->response.data->expires = w->response.data->date + localhost->rrd_update_every;
else
w->response.data->expires = w->response.data->date + 86400;
}
// prepare the HTTP response header
netdata_log_debug(D_WEB_CLIENT, "%llu: Generating HTTP header with response %d.", w->id, w->response.code);
const char *content_type_string = web_content_type_to_string(w->response.data->content_type);
const char *code_msg = web_response_code_to_string(w->response.code);
// prepare the last modified and expiration dates
char date[32], edate[32];
{
struct tm tmbuf, *tm;
tm = gmtime_r(&w->response.data->date, &tmbuf);
strftime(date, sizeof(date), "%a, %d %b %Y %H:%M:%S %Z", tm);
tm = gmtime_r(&w->response.data->expires, &tmbuf);
strftime(edate, sizeof(edate), "%a, %d %b %Y %H:%M:%S %Z", tm);
}
if (w->response.code == HTTP_RESP_HTTPS_UPGRADE) {
buffer_sprintf(w->response.header_output,
"HTTP/1.1 %d %s\r\n"
"Location: https://%s%s\r\n",
w->response.code, code_msg,
w->server_host ? w->server_host : "",
buffer_tostring(w->url_as_received));
w->response.code = HTTP_RESP_MOVED_PERM;
}
else {
buffer_sprintf(w->response.header_output,
"HTTP/1.1 %d %s\r\n"
"Connection: %s\r\n"
"Server: Netdata Embedded HTTP Server %s\r\n"
"Access-Control-Allow-Origin: %s\r\n"
"Access-Control-Allow-Credentials: true\r\n"
"Content-Type: %s\r\n"
"Date: %s\r\n",
w->response.code,
code_msg,
web_client_has_keepalive(w)?"keep-alive":"close",
VERSION,
w->origin ? w->origin : "*",
content_type_string,
date);
}
if(unlikely(web_x_frame_options))
buffer_sprintf(w->response.header_output, "X-Frame-Options: %s\r\n", web_x_frame_options);
if(w->response.has_cookies) {
if(respect_web_browser_do_not_track_policy)
buffer_sprintf(w->response.header_output,
"Tk: T;cookies\r\n");
}
else {
if(respect_web_browser_do_not_track_policy) {
if(web_client_has_tracking_required(w))
buffer_sprintf(w->response.header_output,
"Tk: T;cookies\r\n");
else
buffer_sprintf(w->response.header_output,
"Tk: N\r\n");
}
}
if(w->mode == WEB_CLIENT_MODE_OPTIONS) {
buffer_strcat(w->response.header_output,
"Access-Control-Allow-Methods: GET, OPTIONS\r\n"
"Access-Control-Allow-Headers: accept, x-requested-with, origin, content-type, cookie, pragma, cache-control, x-auth-token\r\n"
"Access-Control-Max-Age: 1209600\r\n" // 86400 * 14
);
}
else {
buffer_sprintf(w->response.header_output,
"Cache-Control: %s\r\n"
"Expires: %s\r\n",
(w->response.data->options & WB_CONTENT_NO_CACHEABLE)?"no-cache, no-store, must-revalidate\r\nPragma: no-cache":"public",
edate);
}
// copy a possibly available custom header
if(unlikely(buffer_strlen(w->response.header)))
buffer_strcat(w->response.header_output, buffer_tostring(w->response.header));
// headers related to the transfer method
if(likely(w->response.zoutput))
buffer_strcat(w->response.header_output, "Content-Encoding: gzip\r\n");
if(likely(w->flags & WEB_CLIENT_CHUNKED_TRANSFER))
buffer_strcat(w->response.header_output, "Transfer-Encoding: chunked\r\n");
else {
if(likely((w->response.data->len || w->response.rlen))) {
// we know the content length, put it
buffer_sprintf(w->response.header_output, "Content-Length: %zu\r\n", w->response.data->len? w->response.data->len: w->response.rlen);
}
else {
// we don't know the content length, disable keep-alive
web_client_disable_keepalive(w);
}
}
// end of HTTP header
buffer_strcat(w->response.header_output, "\r\n");
}
static inline void web_client_send_http_header(struct web_client *w) {
web_client_build_http_header(w);
// sent the HTTP header
netdata_log_debug(D_WEB_DATA, "%llu: Sending response HTTP header of size %zu: '%s'"
, w->id
, buffer_strlen(w->response.header_output)
, buffer_tostring(w->response.header_output)
);
web_client_cork_socket(w);
size_t count = 0;
ssize_t bytes;
#ifdef ENABLE_HTTPS
if ( (!web_client_check_unix(w)) && (netdata_ssl_web_server_ctx) ) {
if (SSL_connection(&w->ssl)) {
bytes = netdata_ssl_write(&w->ssl, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output));
web_client_enable_wait_from_ssl(w);
}
else {
while((bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0)) == -1) {
count++;
if(count > 100 || (errno != EAGAIN && errno != EWOULDBLOCK)) {
netdata_log_error("Cannot send HTTP headers to web client.");
break;
}
}
}
}
else {
while((bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0)) == -1) {
count++;
if(count > 100 || (errno != EAGAIN && errno != EWOULDBLOCK)) {
netdata_log_error("Cannot send HTTP headers to web client.");
break;
}
}
}
#else
while((bytes = send(w->ofd, buffer_tostring(w->response.header_output), buffer_strlen(w->response.header_output), 0)) == -1) {
count++;
if(count > 100 || (errno != EAGAIN && errno != EWOULDBLOCK)) {
netdata_log_error("Cannot send HTTP headers to web client.");
break;
}
}
#endif
if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
if(bytes > 0)
w->statistics.sent_bytes += bytes;
if (bytes < 0) {
netdata_log_error("HTTP headers failed to be sent (I sent %zu bytes but the system sent %zd bytes). Closing web client."
, buffer_strlen(w->response.header_output)
, bytes);
WEB_CLIENT_IS_DEAD(w);
return;
}
}
else
w->statistics.sent_bytes += bytes;
}
static inline int web_client_switch_host(RRDHOST *host, struct web_client *w, char *url, bool nodeid, int (*func)(RRDHOST *, struct web_client *, char *)) {
static uint32_t hash_localhost = 0;
if(unlikely(!hash_localhost)) {
hash_localhost = simple_hash("localhost");
}
if(host != localhost) {
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Nesting of hosts is not allowed.");
return HTTP_RESP_BAD_REQUEST;
}
char *tok = strsep_skip_consecutive_separators(&url, "/");
if(tok && *tok) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Searching for host with name '%s'.", w->id, tok);
if(nodeid) {
host = find_host_by_node_id(tok);
if(!host) {
host = rrdhost_find_by_hostname(tok);
if (!host)
host = rrdhost_find_by_guid(tok);
}
}
else {
host = rrdhost_find_by_hostname(tok);
if(!host) {
host = rrdhost_find_by_guid(tok);
if (!host)
host = find_host_by_node_id(tok);
}
}
if(!host) {
// we didn't find it, but it may be a uuid case mismatch for MACHINE_GUID
// so, recreate the machine guid in lower-case.
uuid_t uuid;
char txt[UUID_STR_LEN];
if (uuid_parse(tok, uuid) == 0) {
uuid_unparse_lower(uuid, txt);
host = rrdhost_find_by_guid(txt);
}
}
if (host) {
if(!url)
//no delim found
return append_slash_to_url_and_redirect(w);
size_t len = strlen(url) + 2;
char buf[len];
buf[0] = '/';
strcpy(&buf[1], url);
buf[len - 1] = '\0';
buffer_flush(w->url_path_decoded);
buffer_strcat(w->url_path_decoded, buf);
return func(host, w, buf);
}
}
buffer_flush(w->response.data);
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data, "This netdata does not maintain a database for host: ");
buffer_strcat_htmlescape(w->response.data, tok?tok:"");
return HTTP_RESP_NOT_FOUND;
}
int web_client_api_request_with_node_selection(RRDHOST *host, struct web_client *w, char *decoded_url_path) {
static uint32_t
hash_api = 0,
hash_host = 0,
hash_node = 0;
if(unlikely(!hash_api)) {
hash_api = simple_hash("api");
hash_host = simple_hash("host");
hash_node = simple_hash("node");
}
char *tok = strsep_skip_consecutive_separators(&decoded_url_path, "/?");
if(likely(tok && *tok)) {
uint32_t hash = simple_hash(tok);
if(unlikely(hash == hash_api && strcmp(tok, "api") == 0)) {
// current API
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: API request ...", w->id);
return check_host_and_call(host, w, decoded_url_path, web_client_api_request);
}
else if(unlikely((hash == hash_host && strcmp(tok, "host") == 0) || (hash == hash_node && strcmp(tok, "node") == 0))) {
// host switching
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: host switch request ...", w->id);
return web_client_switch_host(host, w, decoded_url_path, hash == hash_node, web_client_api_request_with_node_selection);
}
}
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Unknown API endpoint.");
w->response.data->content_type = CT_TEXT_HTML;
return HTTP_RESP_NOT_FOUND;
}
static inline int web_client_process_url(RRDHOST *host, struct web_client *w, char *decoded_url_path) {
if(unlikely(!service_running(ABILITY_WEB_REQUESTS)))
return web_client_permission_denied(w);
static uint32_t
hash_api = 0,
hash_netdata_conf = 0,
hash_host = 0,
hash_node = 0,
hash_v0 = 0,
hash_v1 = 0,
hash_v2 = 0;
#ifdef NETDATA_INTERNAL_CHECKS
static uint32_t hash_exit = 0, hash_debug = 0, hash_mirror = 0;
#endif
if(unlikely(!hash_api)) {
hash_api = simple_hash("api");
hash_netdata_conf = simple_hash("netdata.conf");
hash_host = simple_hash("host");
hash_node = simple_hash("node");
hash_v0 = simple_hash("v0");
hash_v1 = simple_hash("v1");
hash_v2 = simple_hash("v2");
#ifdef NETDATA_INTERNAL_CHECKS
hash_exit = simple_hash("exit");
hash_debug = simple_hash("debug");
hash_mirror = simple_hash("mirror");
#endif
}
// keep a copy of the decoded path, in case we need to serve it as a filename
char filename[FILENAME_MAX + 1];
strncpyz(filename, decoded_url_path ? decoded_url_path : "", FILENAME_MAX);
char *tok = strsep_skip_consecutive_separators(&decoded_url_path, "/?");
if(likely(tok && *tok)) {
uint32_t hash = simple_hash(tok);
netdata_log_debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
if(likely(hash == hash_api && strcmp(tok, "api") == 0)) { // current API
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: API request ...", w->id);
return check_host_and_call(host, w, decoded_url_path, web_client_api_request);
}
else if(unlikely((hash == hash_host && strcmp(tok, "host") == 0) || (hash == hash_node && strcmp(tok, "node") == 0))) { // host switching
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: host switch request ...", w->id);
return web_client_switch_host(host, w, decoded_url_path, hash == hash_node, web_client_process_url);
}
else if(unlikely(hash == hash_v2 && strcmp(tok, "v2") == 0)) {
if(web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_WITH_VERSION))
return bad_request_multiple_dashboard_versions(w);
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_IS_V2);
return web_client_process_url(host, w, decoded_url_path);
}
else if(unlikely(hash == hash_v1 && strcmp(tok, "v1") == 0)) {
if(web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_WITH_VERSION))
return bad_request_multiple_dashboard_versions(w);
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_IS_V1);
return web_client_process_url(host, w, decoded_url_path);
}
else if(unlikely(hash == hash_v0 && strcmp(tok, "v0") == 0)) {
if(web_client_flag_check(w, WEB_CLIENT_FLAG_PATH_WITH_VERSION))
return bad_request_multiple_dashboard_versions(w);
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_IS_V0);
return web_client_process_url(host, w, decoded_url_path);
}
else if(unlikely(hash == hash_netdata_conf && strcmp(tok, "netdata.conf") == 0)) { // netdata.conf
if(unlikely(!web_client_can_access_netdataconf(w)))
return web_client_permission_denied(w);
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: generating netdata.conf ...", w->id);
w->response.data->content_type = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
config_generate(w->response.data, 0);
return HTTP_RESP_OK;
}
#ifdef NETDATA_INTERNAL_CHECKS
else if(unlikely(hash == hash_exit && strcmp(tok, "exit") == 0)) {
if(unlikely(!web_client_can_access_netdataconf(w)))
return web_client_permission_denied(w);
w->response.data->content_type = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
if(!netdata_exit)
buffer_strcat(w->response.data, "ok, will do...");
else
buffer_strcat(w->response.data, "I am doing it already");
netdata_log_error("web request to exit received.");
netdata_cleanup_and_exit(0);
return HTTP_RESP_OK;
}
else if(unlikely(hash == hash_debug && strcmp(tok, "debug") == 0)) {
if(unlikely(!web_client_can_access_netdataconf(w)))
return web_client_permission_denied(w);
buffer_flush(w->response.data);
// get the name of the data to show
tok = strsep_skip_consecutive_separators(&decoded_url_path, "&");
if(tok && *tok) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Searching for RRD data with name '%s'.", w->id, tok);
// do we have such a data set?
RRDSET *st = rrdset_find_byname(host, tok);
if(!st) st = rrdset_find(host, tok);
if(!st) {
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Chart is not found: ");
buffer_strcat_htmlescape(w->response.data, tok);
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
return HTTP_RESP_NOT_FOUND;
}
debug_flags |= D_RRD_STATS;
if(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))
rrdset_flag_clear(st, RRDSET_FLAG_DEBUG);
else
rrdset_flag_set(st, RRDSET_FLAG_DEBUG);
w->response.data->content_type = CT_TEXT_HTML;
buffer_sprintf(w->response.data, "Chart has now debug %s: ", rrdset_flag_check(st, RRDSET_FLAG_DEBUG)?"enabled":"disabled");
buffer_strcat_htmlescape(w->response.data, tok);
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, rrdset_flag_check(st, RRDSET_FLAG_DEBUG)?"enabled":"disabled");
return HTTP_RESP_OK;
}
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "debug which chart?\r\n");
return HTTP_RESP_BAD_REQUEST;
}
else if(unlikely(hash == hash_mirror && strcmp(tok, "mirror") == 0)) {
if(unlikely(!web_client_can_access_netdataconf(w)))
return web_client_permission_denied(w);
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: Mirroring...", w->id);
// replace the zero bytes with spaces
buffer_char_replace(w->response.data, '\0', ' ');
// just leave the buffer as-is
// it will be copied back to the client
return HTTP_RESP_OK;
}
#endif /* NETDATA_INTERNAL_CHECKS */
}
buffer_flush(w->response.data);
return mysendfile(w, filename);
}
void web_client_process_request(struct web_client *w) {
// start timing us
web_client_timeout_checkpoint_init(w);
switch(http_request_validate(w)) {
case HTTP_VALIDATION_OK:
switch(w->mode) {
case WEB_CLIENT_MODE_STREAM:
if(unlikely(!web_client_can_access_stream(w))) {
web_client_permission_denied(w);
return;
}
w->response.code = rrdpush_receiver_thread_spawn(w, (char *)buffer_tostring(w->url_query_string_decoded));
return;
case WEB_CLIENT_MODE_OPTIONS:
if(unlikely(
!web_client_can_access_dashboard(w) &&
!web_client_can_access_registry(w) &&
!web_client_can_access_badges(w) &&
!web_client_can_access_mgmt(w) &&
!web_client_can_access_netdataconf(w)
)) {
web_client_permission_denied(w);
break;
}
w->response.data->content_type = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "OK");
w->response.code = HTTP_RESP_OK;
break;
case WEB_CLIENT_MODE_FILECOPY:
case WEB_CLIENT_MODE_POST:
case WEB_CLIENT_MODE_GET:
if(unlikely(
!web_client_can_access_dashboard(w) &&
!web_client_can_access_registry(w) &&
!web_client_can_access_badges(w) &&
!web_client_can_access_mgmt(w) &&
!web_client_can_access_netdataconf(w)
)) {
web_client_permission_denied(w);
break;
}
web_client_reset_path_flags(w);
// find if the URL path has a filename extension
char path[FILENAME_MAX + 1];
strncpyz(path, buffer_tostring(w->url_path_decoded), FILENAME_MAX);
char *s = path, *e = path;
// remove the query string and find the last char
for (; *e ; e++) {
if (*e == '?')
break;
}
if(e == s || (*(e - 1) == '/'))
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_HAS_TRAILING_SLASH);
// check if there is a filename extension
while (--e > s) {
if (*e == '/')
break;
if(*e == '.') {
web_client_flag_set(w, WEB_CLIENT_FLAG_PATH_HAS_FILE_EXTENSION);
break;
}
}
w->response.code = (short)web_client_process_url(localhost, w, path);
break;
}
break;
case HTTP_VALIDATION_INCOMPLETE:
if(w->response.data->len > NETDATA_WEB_REQUEST_MAX_SIZE) {
buffer_flush(w->url_as_received);
buffer_strcat(w->url_as_received, "too big request");
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zu bytes).", w->id, w->response.data->len);
size_t len = w->response.data->len;
buffer_flush(w->response.data);
buffer_sprintf(w->response.data, "Received request is too big (received %zu bytes, max is %zu bytes).\r\n", len, (size_t)NETDATA_WEB_REQUEST_MAX_SIZE);
w->response.code = HTTP_RESP_BAD_REQUEST;
}
else {
// wait for more data
// set to normal to prevent web_server_rcv_callback
// from going into stream mode
if (w->mode == WEB_CLIENT_MODE_STREAM)
w->mode = WEB_CLIENT_MODE_GET;
return;
}
break;
#ifdef ENABLE_HTTPS
case HTTP_VALIDATION_REDIRECT:
{
buffer_flush(w->response.data);
w->response.data->content_type = CT_TEXT_HTML;
buffer_strcat(w->response.data,
""
""
"Redirecting to safety connection, case your browser does not support redirection, please"
" click here."
"");
w->response.code = HTTP_RESP_HTTPS_UPGRADE;
break;
}
#endif
case HTTP_VALIDATION_MALFORMED_URL:
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: Malformed URL '%s'.", w->id, w->response.data->buffer);
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Malformed URL...\r\n");
w->response.code = HTTP_RESP_BAD_REQUEST;
break;
case HTTP_VALIDATION_EXCESS_REQUEST_DATA:
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: Excess data in request '%s'.", w->id, w->response.data->buffer);
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Excess data in request.\r\n");
w->response.code = HTTP_RESP_BAD_REQUEST;
break;
case HTTP_VALIDATION_TOO_MANY_READ_RETRIES:
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: Too many retries to read request '%s'.", w->id, w->response.data->buffer);
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Too many retries to read request.\r\n");
w->response.code = HTTP_RESP_BAD_REQUEST;
break;
case HTTP_VALIDATION_NOT_SUPPORTED:
netdata_log_debug(D_WEB_CLIENT_ACCESS, "%llu: HTTP method requested is not supported '%s'.", w->id, w->response.data->buffer);
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "HTTP method requested is not supported...\r\n");
w->response.code = HTTP_RESP_BAD_REQUEST;
break;
}
// keep track of the processing time
web_client_timeout_checkpoint_response_ready(w, NULL);
w->response.sent = 0;
web_client_send_http_header(w);
// enable sending immediately if we have data
if(w->response.data->len) web_client_enable_wait_send(w);
else web_client_disable_wait_send(w);
switch(w->mode) {
case WEB_CLIENT_MODE_STREAM:
netdata_log_debug(D_WEB_CLIENT, "%llu: STREAM done.", w->id);
break;
case WEB_CLIENT_MODE_OPTIONS:
netdata_log_debug(D_WEB_CLIENT, "%llu: Done preparing the OPTIONS response. Sending data (%zu bytes) to client.", w->id, w->response.data->len);
break;
case WEB_CLIENT_MODE_POST:
case WEB_CLIENT_MODE_GET:
netdata_log_debug(D_WEB_CLIENT, "%llu: Done preparing the response. Sending data (%zu bytes) to client.", w->id, w->response.data->len);
break;
case WEB_CLIENT_MODE_FILECOPY:
if(w->response.rlen) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending data file of %zu bytes to client.", w->id, w->response.rlen);
web_client_enable_wait_receive(w);
/*
// utilize the kernel sendfile() for copying the file to the socket.
// this block of code can be commented, without anything missing.
// when it is commented, the program will copy the data using async I/O.
{
long len = sendfile(w->ofd, w->ifd, NULL, w->response.data->rbytes);
if(len != w->response.data->rbytes)
netdata_log_error("%llu: sendfile() should copy %ld bytes, but copied %ld. Falling back to manual copy.", w->id, w->response.data->rbytes, len);
else
web_client_request_done(w);
}
*/
}
else
netdata_log_debug(D_WEB_CLIENT, "%llu: Done preparing the response. Will be sending an unknown amount of bytes to client.", w->id);
break;
default:
fatal("%llu: Unknown client mode %u.", w->id, w->mode);
break;
}
}
ssize_t web_client_send_chunk_header(struct web_client *w, size_t len)
{
netdata_log_debug(D_DEFLATE, "%llu: OPEN CHUNK of %zu bytes (hex: %zx).", w->id, len, len);
char buf[24];
ssize_t bytes;
bytes = (ssize_t)sprintf(buf, "%zX\r\n", len);
buf[bytes] = 0x00;
bytes = web_client_send_data(w,buf,strlen(buf),0);
if(bytes > 0) {
netdata_log_debug(D_DEFLATE, "%llu: Sent chunk header %zd bytes.", w->id, bytes);
w->statistics.sent_bytes += bytes;
}
else if(bytes == 0) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
}
else {
netdata_log_debug(D_WEB_CLIENT, "%llu: Failed to send chunk header to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return bytes;
}
ssize_t web_client_send_chunk_close(struct web_client *w)
{
//debug(D_DEFLATE, "%llu: CLOSE CHUNK.", w->id);
ssize_t bytes;
bytes = web_client_send_data(w,"\r\n",2,0);
if(bytes > 0) {
netdata_log_debug(D_DEFLATE, "%llu: Sent chunk suffix %zd bytes.", w->id, bytes);
w->statistics.sent_bytes += bytes;
}
else if(bytes == 0) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
}
else {
netdata_log_debug(D_WEB_CLIENT, "%llu: Failed to send chunk suffix to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return bytes;
}
ssize_t web_client_send_chunk_finalize(struct web_client *w)
{
//debug(D_DEFLATE, "%llu: FINALIZE CHUNK.", w->id);
ssize_t bytes;
bytes = web_client_send_data(w,"\r\n0\r\n\r\n",7,0);
if(bytes > 0) {
netdata_log_debug(D_DEFLATE, "%llu: Sent chunk suffix %zd bytes.", w->id, bytes);
w->statistics.sent_bytes += bytes;
}
else if(bytes == 0) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
}
else {
netdata_log_debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return bytes;
}
ssize_t web_client_send_deflate(struct web_client *w)
{
ssize_t len = 0, t = 0;
// when using compression,
// w->response.sent is the amount of bytes passed through compression
netdata_log_debug(D_DEFLATE, "%llu: web_client_send_deflate(): w->response.data->len = %zu, w->response.sent = %zu, w->response.zhave = %zu, w->response.zsent = %zu, w->response.zstream.avail_in = %u, w->response.zstream.avail_out = %u, w->response.zstream.total_in = %lu, w->response.zstream.total_out = %lu.",
w->id, w->response.data->len, w->response.sent, w->response.zhave, w->response.zsent, w->response.zstream.avail_in, w->response.zstream.avail_out, w->response.zstream.total_in, w->response.zstream.total_out);
if(w->response.data->len - w->response.sent == 0 && w->response.zstream.avail_in == 0 && w->response.zhave == w->response.zsent && w->response.zstream.avail_out != 0) {
// there is nothing to send
netdata_log_debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
// finalize the chunk
if(w->response.sent != 0) {
t = web_client_send_chunk_finalize(w);
if(t < 0) return t;
}
if(w->mode == WEB_CLIENT_MODE_FILECOPY && web_client_has_wait_receive(w) && w->response.rlen && w->response.rlen > w->response.data->len) {
// we have to wait, more data will come
netdata_log_debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
web_client_disable_wait_send(w);
return t;
}
if(unlikely(!web_client_has_keepalive(w))) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %zu bytes sent.", w->id, w->response.sent);
WEB_CLIENT_IS_DEAD(w);
return t;
}
// reset the client
web_client_request_done(w);
netdata_log_debug(D_WEB_CLIENT, "%llu: Done sending all data on socket.", w->id);
return t;
}
if(w->response.zhave == w->response.zsent) {
// compress more input data
// close the previous open chunk
if(w->response.sent != 0) {
t = web_client_send_chunk_close(w);
if(t < 0) return t;
}
netdata_log_debug(D_DEFLATE, "%llu: Compressing %zu new bytes starting from %zu (and %u left behind).", w->id, (w->response.data->len - w->response.sent), w->response.sent, w->response.zstream.avail_in);
// give the compressor all the data not passed through the compressor yet
if(w->response.data->len > w->response.sent) {
w->response.zstream.next_in = (Bytef *)&w->response.data->buffer[w->response.sent - w->response.zstream.avail_in];
w->response.zstream.avail_in += (uInt) (w->response.data->len - w->response.sent);
}
// reset the compressor output buffer
w->response.zstream.next_out = w->response.zbuffer;
w->response.zstream.avail_out = NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE;
// ask for FINISH if we have all the input
int flush = Z_SYNC_FLUSH;
if((w->mode == WEB_CLIENT_MODE_GET || w->mode == WEB_CLIENT_MODE_POST)
|| (w->mode == WEB_CLIENT_MODE_FILECOPY && !web_client_has_wait_receive(w) && w->response.data->len == w->response.rlen)) {
flush = Z_FINISH;
netdata_log_debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
}
else {
netdata_log_debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
}
// compress
if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
netdata_log_error("%llu: Compression failed. Closing down client.", w->id);
web_client_request_done(w);
return(-1);
}
w->response.zhave = NETDATA_WEB_RESPONSE_ZLIB_CHUNK_SIZE - w->response.zstream.avail_out;
w->response.zsent = 0;
// keep track of the bytes passed through the compressor
w->response.sent = w->response.data->len;
netdata_log_debug(D_DEFLATE, "%llu: Compression produced %zu bytes.", w->id, w->response.zhave);
// open a new chunk
ssize_t t2 = web_client_send_chunk_header(w, w->response.zhave);
if(t2 < 0) return t2;
t += t2;
}
netdata_log_debug(D_WEB_CLIENT, "%llu: Sending %zu bytes of data (+%zd of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
len = web_client_send_data(w,&w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
if(len > 0) {
w->statistics.sent_bytes += len;
w->response.zsent += len;
len += t;
netdata_log_debug(D_WEB_CLIENT, "%llu: Sent %zd bytes.", w->id, len);
}
else if(len == 0) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client (zhave = %zu, zsent = %zu, need to send = %zu).",
w->id, w->response.zhave, w->response.zsent, w->response.zhave - w->response.zsent);
}
else {
netdata_log_debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return(len);
}
ssize_t web_client_send(struct web_client *w) {
if(likely(w->response.zoutput)) return web_client_send_deflate(w);
ssize_t bytes;
if(unlikely(w->response.data->len - w->response.sent == 0)) {
// there is nothing to send
netdata_log_debug(D_WEB_CLIENT, "%llu: Out of output data.", w->id);
// there can be two cases for this
// A. we have done everything
// B. we temporarily have nothing to send, waiting for the buffer to be filled by ifd
if(w->mode == WEB_CLIENT_MODE_FILECOPY && web_client_has_wait_receive(w) && w->response.rlen && w->response.rlen > w->response.data->len) {
// we have to wait, more data will come
netdata_log_debug(D_WEB_CLIENT, "%llu: Waiting for more data to become available.", w->id);
web_client_disable_wait_send(w);
return 0;
}
if(unlikely(!web_client_has_keepalive(w))) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Closing (keep-alive is not enabled). %zu bytes sent.", w->id, w->response.sent);
WEB_CLIENT_IS_DEAD(w);
return 0;
}
web_client_request_done(w);
netdata_log_debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
return 0;
}
bytes = web_client_send_data(w,&w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
if(likely(bytes > 0)) {
w->statistics.sent_bytes += bytes;
w->response.sent += bytes;
netdata_log_debug(D_WEB_CLIENT, "%llu: Sent %zd bytes.", w->id, bytes);
}
else if(likely(bytes == 0)) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
}
else {
netdata_log_debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return(bytes);
}
ssize_t web_client_read_file(struct web_client *w)
{
if(unlikely(w->response.rlen > w->response.data->size))
buffer_need_bytes(w->response.data, w->response.rlen - w->response.data->size);
if(unlikely(w->response.rlen <= w->response.data->len))
return 0;
ssize_t left = (ssize_t)(w->response.rlen - w->response.data->len);
ssize_t bytes = read(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t)left);
if(likely(bytes > 0)) {
size_t old = w->response.data->len;
(void)old;
w->response.data->len += bytes;
w->response.data->buffer[w->response.data->len] = '\0';
netdata_log_debug(D_WEB_CLIENT, "%llu: Read %zd bytes.", w->id, bytes);
netdata_log_debug(D_WEB_DATA, "%llu: Read data: '%s'.", w->id, &w->response.data->buffer[old]);
web_client_enable_wait_send(w);
if(w->response.rlen && w->response.data->len >= w->response.rlen)
web_client_disable_wait_receive(w);
}
else if(likely(bytes == 0)) {
netdata_log_debug(D_WEB_CLIENT, "%llu: Out of input file data.", w->id);
// if we cannot read, it means we have an error on input.
// if however, we are copying a file from ifd to ofd, we should not return an error.
// in this case, the error should be generated when the file has been sent to the client.
// we are copying data from ifd to ofd
// let it finish copying...
web_client_disable_wait_receive(w);
netdata_log_debug(D_WEB_CLIENT, "%llu: Read the whole file.", w->id);
if(web_server_mode != WEB_SERVER_MODE_STATIC_THREADED) {
if (w->ifd != w->ofd) close(w->ifd);
}
w->ifd = w->ofd;
}
else {
netdata_log_debug(D_WEB_CLIENT, "%llu: read data failed.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return(bytes);
}
ssize_t web_client_receive(struct web_client *w)
{
if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY))
return web_client_read_file(w);
ssize_t bytes;
ssize_t left = (ssize_t)(w->response.data->size - w->response.data->len);
// do we have any space for more data?
buffer_need_bytes(w->response.data, NETDATA_WEB_REQUEST_INITIAL_SIZE);
errno = 0;
#ifdef ENABLE_HTTPS
if ( (!web_client_check_unix(w)) && (netdata_ssl_web_server_ctx) ) {
if (SSL_connection(&w->ssl)) {
bytes = netdata_ssl_read(&w->ssl, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1));
web_client_enable_wait_from_ssl(w);
}
else {
bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
}
}
else{
bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
}
#else
bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
#endif
if(likely(bytes > 0)) {
w->statistics.received_bytes += bytes;
size_t old = w->response.data->len;
(void)old;
w->response.data->len += bytes;
w->response.data->buffer[w->response.data->len] = '\0';
netdata_log_debug(D_WEB_CLIENT, "%llu: Received %zd bytes.", w->id, bytes);
netdata_log_debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
}
else if(unlikely(bytes < 0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR))) {
web_client_enable_wait_receive(w);
return 0;
}
else if (bytes < 0) {
netdata_log_debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
WEB_CLIENT_IS_DEAD(w);
} else
netdata_log_debug(D_WEB_CLIENT, "%llu: Received %zd bytes.", w->id, bytes);
return(bytes);
}
void web_client_decode_path_and_query_string(struct web_client *w, const char *path_and_query_string) {
char buffer[NETDATA_WEB_REQUEST_URL_SIZE + 2];
buffer[0] = '\0';
buffer_flush(w->url_path_decoded);
buffer_flush(w->url_query_string_decoded);
if(buffer_strlen(w->url_as_received) == 0)
// do not overwrite this if it is already filled
buffer_strcat(w->url_as_received, path_and_query_string);
if(w->mode == WEB_CLIENT_MODE_STREAM) {
// in stream mode, there is no path
url_decode_r(buffer, path_and_query_string, NETDATA_WEB_REQUEST_URL_SIZE + 1);
buffer[NETDATA_WEB_REQUEST_URL_SIZE + 1] = '\0';
buffer_strcat(w->url_query_string_decoded, buffer);
}
else {
// in non-stream mode, there is a path
// FIXME - the way this is implemented, query string params never accept the symbol &, not even encoded as %26
// To support the symbol & in query string params, we need to turn the url_query_string_decoded into a
// dictionary and decode each of the parameters individually.
// OR: in url_query_string_decoded use as separator a control character that cannot appear in the URL.
url_decode_r(buffer, path_and_query_string, NETDATA_WEB_REQUEST_URL_SIZE + 1);
char *question_mark_start = strchr(buffer, '?');
if (question_mark_start) {
buffer_strcat(w->url_query_string_decoded, question_mark_start);
char c = *question_mark_start;
*question_mark_start = '\0';
buffer_strcat(w->url_path_decoded, buffer);
*question_mark_start = c;
} else {
buffer_strcat(w->url_query_string_decoded, "");
buffer_strcat(w->url_path_decoded, buffer);
}
}
}
void web_client_reuse_from_cache(struct web_client *w) {
// zero everything about it - but keep the buffers
web_client_reset_allocations(w, false);
// remember the pointers to the buffers
BUFFER *b1 = w->response.data;
BUFFER *b2 = w->response.header;
BUFFER *b3 = w->response.header_output;
BUFFER *b4 = w->url_path_decoded;
BUFFER *b5 = w->url_as_received;
BUFFER *b6 = w->url_query_string_decoded;
#ifdef ENABLE_HTTPS
NETDATA_SSL ssl = w->ssl;
#endif
size_t use_count = w->use_count;
size_t *statistics_memory_accounting = w->statistics.memory_accounting;
// zero everything
memset(w, 0, sizeof(struct web_client));
w->ifd = w->ofd = -1;
w->statistics.memory_accounting = statistics_memory_accounting;
w->use_count = use_count;
#ifdef ENABLE_HTTPS
w->ssl = ssl;
#endif
// restore the pointers of the buffers
w->response.data = b1;
w->response.header = b2;
w->response.header_output = b3;
w->url_path_decoded = b4;
w->url_as_received = b5;
w->url_query_string_decoded = b6;
}
struct web_client *web_client_create(size_t *statistics_memory_accounting) {
struct web_client *w = (struct web_client *)callocz(1, sizeof(struct web_client));
#ifdef ENABLE_HTTPS
w->ssl = NETDATA_SSL_UNSET_CONNECTION;
#endif
w->use_count = 1;
w->statistics.memory_accounting = statistics_memory_accounting;
w->url_as_received = buffer_create(NETDATA_WEB_DECODED_URL_INITIAL_SIZE, w->statistics.memory_accounting);
w->url_path_decoded = buffer_create(NETDATA_WEB_DECODED_URL_INITIAL_SIZE, w->statistics.memory_accounting);
w->url_query_string_decoded = buffer_create(NETDATA_WEB_DECODED_URL_INITIAL_SIZE, w->statistics.memory_accounting);
w->response.data = buffer_create(NETDATA_WEB_RESPONSE_INITIAL_SIZE, w->statistics.memory_accounting);
w->response.header = buffer_create(NETDATA_WEB_RESPONSE_HEADER_INITIAL_SIZE, w->statistics.memory_accounting);
w->response.header_output = buffer_create(NETDATA_WEB_RESPONSE_HEADER_INITIAL_SIZE, w->statistics.memory_accounting);
__atomic_add_fetch(w->statistics.memory_accounting, sizeof(struct web_client), __ATOMIC_RELAXED);
return w;
}
void web_client_free(struct web_client *w) {
#ifdef ENABLE_HTTPS
netdata_ssl_close(&w->ssl);
#endif
web_client_reset_allocations(w, true);
__atomic_sub_fetch(w->statistics.memory_accounting, sizeof(struct web_client), __ATOMIC_RELAXED);
freez(w);
}
inline void web_client_timeout_checkpoint_init(struct web_client *w) {
now_monotonic_high_precision_timeval(&w->timings.tv_in);
}
inline void web_client_timeout_checkpoint_set(struct web_client *w, int timeout_ms) {
w->timings.timeout_ut = timeout_ms * USEC_PER_MS;
if(!w->timings.tv_in.tv_sec)
web_client_timeout_checkpoint_init(w);
if(!w->timings.tv_timeout_last_checkpoint.tv_sec)
w->timings.tv_timeout_last_checkpoint = w->timings.tv_in;
}
inline usec_t web_client_timeout_checkpoint(struct web_client *w) {
struct timeval now;
now_monotonic_high_precision_timeval(&now);
if (!w->timings.tv_timeout_last_checkpoint.tv_sec)
w->timings.tv_timeout_last_checkpoint = w->timings.tv_in;
usec_t since_last_check_ut = dt_usec(&w->timings.tv_timeout_last_checkpoint, &now);
w->timings.tv_timeout_last_checkpoint = now;
return since_last_check_ut;
}
inline usec_t web_client_timeout_checkpoint_response_ready(struct web_client *w, usec_t *usec_since_last_checkpoint) {
usec_t since_last_check_ut = web_client_timeout_checkpoint(w);
if(usec_since_last_checkpoint)
*usec_since_last_checkpoint = since_last_check_ut;
w->timings.tv_ready = w->timings.tv_timeout_last_checkpoint;
// return the total time of the query
return dt_usec(&w->timings.tv_in, &w->timings.tv_ready);
}
inline bool web_client_timeout_checkpoint_and_check(struct web_client *w, usec_t *usec_since_last_checkpoint) {
usec_t since_last_check_ut = web_client_timeout_checkpoint(w);
if(usec_since_last_checkpoint)
*usec_since_last_checkpoint = since_last_check_ut;
if(!w->timings.timeout_ut)
return false;
usec_t since_reception_ut = dt_usec(&w->timings.tv_in, &w->timings.tv_timeout_last_checkpoint);
if (since_reception_ut >= w->timings.timeout_ut) {
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "Query timeout exceeded");
w->response.code = HTTP_RESP_BACKEND_FETCH_FAILED;
return true;
}
return false;
}