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web_client.c
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// 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;
#ifdef NETDATA_WITH_ZLIB
int web_enable_gzip = 1, web_gzip_level = 3, web_gzip_strategy = Z_DEFAULT_STRATEGY;
#endif /* NETDATA_WITH_ZLIB */
inline int web_client_permission_denied(struct web_client *w) {
w->response.data->contenttype = 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;
}
static inline int web_client_crock_socket(struct web_client *w) {
#ifdef TCP_CORK
if(likely(web_client_is_corkable(w) && !w->tcp_cork && w->ofd != -1)) {
w->tcp_cork = 1;
if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
error("%llu: failed to enable TCP_CORK on socket.", w->id);
w->tcp_cork = 0;
return -1;
}
}
#else
(void)w;
#endif /* TCP_CORK */
return 0;
}
static inline int web_client_uncrock_socket(struct web_client *w) {
#ifdef TCP_CORK
if(likely(w->tcp_cork && w->ofd != -1)) {
w->tcp_cork = 0;
if(unlikely(setsockopt(w->ofd, IPPROTO_TCP, TCP_CORK, (char *) &w->tcp_cork, sizeof(int)) != 0)) {
error("%llu: failed to disable TCP_CORK on socket.", w->id);
w->tcp_cork = 1;
return -1;
}
}
#else
(void)w;
#endif /* TCP_CORK */
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;
}
void web_client_request_done(struct web_client *w) {
web_client_uncrock_socket(w);
debug(D_WEB_CLIENT, "%llu: Resetting client.", w->id);
if(likely(w->last_url[0])) {
struct timeval tv;
now_realtime_timeval(&tv);
size_t size = (w->mode == WEB_CLIENT_MODE_FILECOPY)?w->response.rlen:w->response.data->len;
size_t sent = size;
#ifdef NETDATA_WITH_ZLIB
if(likely(w->response.zoutput)) sent = (size_t)w->response.zstream.total_out;
#endif
// --------------------------------------------------------------------
// global statistics
finished_web_request_statistics(dt_usec(&tv, &w->tv_in),
w->stats_received_bytes,
w->stats_sent_bytes,
size,
sent);
w->stats_received_bytes = 0;
w->stats_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_NORMAL:
mode = "DATA";
break;
default:
mode = "UNKNOWN";
break;
}
// access log
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) ? ((size - sent) / (double) size * 100.0) : 0.0)
, dt_usec(&w->tv_ready, &w->tv_in) / 1000.0
, dt_usec(&tv, &w->tv_ready) / 1000.0
, dt_usec(&tv, &w->tv_in) / 1000.0
, w->response.code
, strip_control_characters(w->last_url)
);
}
if(unlikely(w->mode == WEB_CLIENT_MODE_FILECOPY)) {
if(w->ifd != w->ofd) {
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;
}
}
w->last_url[0] = '\0';
w->cookie1[0] = '\0';
w->cookie2[0] = '\0';
w->origin[0] = '*';
w->origin[1] = '\0';
freez(w->user_agent); w->user_agent = NULL;
if (w->auth_bearer_token) {
freez(w->auth_bearer_token);
w->auth_bearer_token = NULL;
}
w->mode = WEB_CLIENT_MODE_NORMAL;
w->tcp_cork = 0;
web_client_disable_donottrack(w);
web_client_disable_tracking_required(w);
web_client_disable_keepalive(w);
w->decoded_url[0] = '\0';
buffer_reset(w->response.header_output);
buffer_reset(w->response.header);
buffer_reset(w->response.data);
w->response.rlen = 0;
w->response.sent = 0;
w->response.code = 0;
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.zoutput = 0;
// if we had enabled compression, release it
#ifdef NETDATA_WITH_ZLIB
if(w->response.zinitialized) {
debug(D_DEFLATE, "%llu: Freeing compression resources.", w->id);
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 = 0;
w->flags &= ~WEB_CLIENT_CHUNKED_TRANSFER;
}
#endif // NETDATA_WITH_ZLIB
}
uid_t web_files_uid(void) {
static char *web_owner = NULL;
static uid_t owner_uid = 0;
if(unlikely(!web_owner)) {
// getpwuid() is not thread safe,
// but we have called this function once
// while single threaded
struct passwd *pw = getpwuid(geteuid());
web_owner = config_get(CONFIG_SECTION_WEB, "web files owner", (pw)?(pw->pw_name?pw->pw_name:""):"");
if(!web_owner || !*web_owner)
owner_uid = geteuid();
else {
// getpwnam() is not thread safe,
// but we have called this function once
// while single threaded
pw = getpwnam(web_owner);
if(!pw) {
error("User '%s' is not present. Ignoring option.", web_owner);
owner_uid = geteuid();
}
else {
debug(D_WEB_CLIENT, "Web files owner set to %s.", web_owner);
owner_uid = pw->pw_uid;
}
}
}
return(owner_uid);
}
gid_t web_files_gid(void) {
static char *web_group = NULL;
static gid_t owner_gid = 0;
if(unlikely(!web_group)) {
// getgrgid() is not thread safe,
// but we have called this function once
// while single threaded
struct group *gr = getgrgid(getegid());
web_group = config_get(CONFIG_SECTION_WEB, "web files group", (gr)?(gr->gr_name?gr->gr_name:""):"");
if(!web_group || !*web_group)
owner_gid = getegid();
else {
// getgrnam() is not thread safe,
// but we have called this function once
// while single threaded
gr = getgrnam(web_group);
if(!gr) {
error("Group '%s' is not present. Ignoring option.", web_group);
owner_gid = getegid();
}
else {
debug(D_WEB_CLIENT, "Web files group set to %s.", web_group);
owner_gid = gr->gr_gid;
}
}
}
return(owner_gid);
}
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) {
// 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])) {
// info("no extension for filename '%s'", filename);
return CT_APPLICATION_OCTET_STREAM;
}
last_dot++;
// 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))) {
// info("matched extension for filename '%s': '%s'", filename, last_dot);
return mime_types[i].contenttype;
}
}
// info("not matched extension for filename '%s': '%s'", filename, last_dot);
return CT_APPLICATION_OCTET_STREAM;
}
static inline int access_to_file_is_not_permitted(struct web_client *w, const char *filename) {
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Access to file is not permitted: ");
buffer_strcat_htmlescape(w->response.data, filename);
return HTTP_RESP_FORBIDDEN;
}
// Work around a bug in the CMocka library by removing this function during testing.
#ifndef REMOVE_MYSENDFILE
int mysendfile(struct web_client *w, char *filename) {
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 != '_') {
debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
w->response.data->contenttype = 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 .. refuse to serve it
if(strstr(filename, "..") != 0) {
debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not acceptable.", w->id, filename);
w->response.data->contenttype = 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
char webfilename[FILENAME_MAX + 1];
snprintfz(webfilename, FILENAME_MAX, "%s/%s", netdata_configured_web_dir, filename);
struct stat statbuf;
int done = 0;
while(!done) {
// check if the file exists
if (lstat(webfilename, &statbuf) != 0) {
debug(D_WEB_CLIENT_ACCESS, "%llu: File '%s' is not found.", w->id, webfilename);
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "File does not exist, or is not accessible: ");
buffer_strcat_htmlescape(w->response.data, webfilename);
return HTTP_RESP_NOT_FOUND;
}
if ((statbuf.st_mode & S_IFMT) == S_IFDIR) {
snprintfz(webfilename, FILENAME_MAX, "%s/%s/index.html", netdata_configured_web_dir, filename);
continue;
}
if ((statbuf.st_mode & S_IFMT) != S_IFREG) {
error("%llu: File '%s' is not a regular file. Access Denied.", w->id, webfilename);
return access_to_file_is_not_permitted(w, webfilename);
}
// check if the file is owned by expected user
if (statbuf.st_uid != web_files_uid()) {
error("%llu: File '%s' is owned by user %u (expected user %u). Access Denied.", w->id, webfilename, statbuf.st_uid, web_files_uid());
return access_to_file_is_not_permitted(w, webfilename);
}
// check if the file is owned by expected group
if (statbuf.st_gid != web_files_gid()) {
error("%llu: File '%s' is owned by group %u (expected group %u). Access Denied.", w->id, webfilename, statbuf.st_gid, web_files_gid());
return access_to_file_is_not_permitted(w, webfilename);
}
done = 1;
}
// open the file
w->ifd = open(webfilename, O_NONBLOCK, O_RDONLY);
if(w->ifd == -1) {
w->ifd = w->ofd;
if(errno == EBUSY || errno == EAGAIN) {
error("%llu: File '%s' is busy, sending 307 Moved Temporarily to force retry.", w->id, webfilename);
w->response.data->contenttype = 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, webfilename);
return HTTP_RESP_REDIR_TEMP;
}
else {
error("%llu: Cannot open file '%s'.", w->id, webfilename);
w->response.data->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Cannot open file: ");
buffer_strcat_htmlescape(w->response.data, webfilename);
return HTTP_RESP_NOT_FOUND;
}
}
sock_setnonblock(w->ifd);
w->response.data->contenttype = contenttype_for_filename(webfilename);
debug(D_WEB_CLIENT_ACCESS, "%llu: Sending file '%s' (%ld bytes, ifd %d, ofd %d).", w->id, webfilename, 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
#ifdef NETDATA_WITH_ZLIB
void web_client_enable_deflate(struct web_client *w, int gzip) {
if(unlikely(w->response.zinitialized)) {
debug(D_DEFLATE, "%llu: Compression has already be initialized for this client.", w->id);
return;
}
if(unlikely(w->response.sent)) {
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) {
// 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) {
error("%llu: Failed to initialize zlib. Proceeding without compression.", w->id);
return;
}
w->response.zsent = 0;
w->response.zoutput = 1;
w->response.zinitialized = 1;
w->flags |= WEB_CLIENT_CHUNKED_TRANSFER;
debug(D_DEFLATE, "%llu: Initialized compression.", w->id);
}
#endif // NETDATA_WITH_ZLIB
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");
}
}
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 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 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)
{
// get the api version
char *tok = mystrsep(&url, "/");
if(tok && *tok) {
debug(D_WEB_CLIENT, "%llu: Searching for API version '%s'.", w->id, tok);
if(strcmp(tok, "v1") == 0)
return web_client_api_request_v1(host, w, url);
else {
buffer_flush(w->response.data);
w->response.data->contenttype = 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(uint8_t contenttype) {
switch(contenttype) {
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/x-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";
default:
case CT_TEXT_PLAIN:
return "text/plain; charset=utf-8";
}
}
const char *web_response_code_to_string(int code) {
switch(code) {
case HTTP_RESP_OK:
return "OK";
case HTTP_RESP_MOVED_PERM:
return "Moved Permanently";
case HTTP_RESP_REDIR_TEMP:
return "Temporary Redirect";
case HTTP_RESP_BAD_REQUEST:
return "Bad Request";
case HTTP_RESP_FORBIDDEN:
return "Forbidden";
case HTTP_RESP_NOT_FOUND:
return "Not Found";
case HTTP_RESP_PRECOND_FAIL:
return "Preconditions Failed";
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 "Bad Request";
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_proto = 0, hash_forwarded_host = 0;
#ifdef NETDATA_WITH_ZLIB
static uint32_t hash_accept_encoding = 0;
#endif
if(unlikely(!hash_origin)) {
hash_origin = simple_uhash("Origin");
hash_connection = simple_uhash("Connection");
#ifdef NETDATA_WITH_ZLIB
hash_accept_encoding = simple_uhash("Accept-Encoding");
#endif
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_proto = simple_uhash("X-Forwarded-Proto");
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"))
strncpyz(w->origin, v, NETDATA_WEB_REQUEST_ORIGIN_HEADER_SIZE);
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")){
strncpyz(w->server_host, v, ((size_t)(ve - v) < sizeof(w->server_host)-1 ? (size_t)(ve - v) : sizeof(w->server_host)-1));
}
#ifdef NETDATA_WITH_ZLIB
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);
}
}
#endif /* NETDATA_WITH_ZLIB */
#ifdef ENABLE_HTTPS
else if(hash == hash_forwarded_proto && !strcasecmp(s, "X-Forwarded-Proto")) {
if(strcasestr(v, "https"))
w->ssl.flags |= NETDATA_SSL_PROXY_HTTPS;
}
#endif
else if(hash == hash_forwarded_host && !strcasecmp(s, "X-Forwarded-Host")){
strncpyz(w->forwarded_host, v, ((size_t)(ve - v) < sizeof(w->server_host)-1 ? (size_t)(ve - v) : sizeof(w->server_host)-1));
}
*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_NORMAL;
}
else if(!strncmp(s, "OPTIONS ", 8)) {
s = &s[8];
w->mode = WEB_CLIENT_MODE_OPTIONS;
}
else if(!strncmp(s, "STREAM ", 7)) {
s = &s[7];
#ifdef ENABLE_HTTPS
if (w->ssl.flags && 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;
}
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;
}
/**
* Set Path Query
*
* Set the pointers to the path and query string according to the input.
*
* @param w is the structure with the client request
* @param s is the first address of the string.
* @param ptr is the address of the separator.
*/
static void web_client_set_path_query(struct web_client *w, char *s, char *ptr) {
w->url_path_length = (size_t)(ptr -s);
w->url_search_path = ptr;
}
/**
* Split path query
*
* Do the separation between path and query string
*
* @param w is the structure with the client request
* @param s is the string to parse
*/
void web_client_split_path_query(struct web_client *w, char *s) {
//I am assuming here that the separator character(?) is not encoded
char *ptr = strchr(s, '?');
if(ptr) {
w->separator = '?';
web_client_set_path_query(w, s, ptr);
return;
}
//Here I test the second possibility, the URL is completely encoded by the user.
//I am not using the strcasestr, because it is fastest to check %3f and compare
//the next character.
//We executed some tests with "encodeURI(uri);" described in https://www.w3schools.com/jsref/jsref_encodeuri.asp
//on July 1st, 2019, that show us that URLs won't have '?','=' and '&' encoded, but we decided to move in front
//with the next part, because users can develop their own encoded that won't follow this rule.
char *moveme = s;
while (moveme) {
ptr = strchr(moveme, '%');
if(ptr) {
char *test = (ptr+1);
if (!strncmp(test, "3f", 2) || !strncmp(test, "3F", 2)) {
w->separator = *ptr;
web_client_set_path_query(w, s, ptr);
return;
}
ptr++;
}
moveme = ptr;
}
w->separator = 0x00;
w->url_path_length = strlen(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);
if(!is_it_valid) {
if(w->header_parse_tries > 10) {
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_NOT_SUPPORTED;
}
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);
}
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);