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netdata/web/server/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 = 403;
return 403;
}
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;
}
static inline 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;
}
#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 403;
}
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 400;
}
}
// 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 400;
}
// 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 404;
}
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 307;
}
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 404;
}
}
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 /* __APPLE__ */
buffer_cacheable(w->response.data);
return 200;
}
#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;
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 400;
}
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 404;
}
}
else {
buffer_flush(w->response.data);
buffer_sprintf(w->response.data, "Which API version?");
return 400;
}
}
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 200:
return "OK";
case 307:
return "Temporary Redirect";
case 400:
return "Bad Request";
case 403:
return "Forbidden";
case 404:
return "Not Found";
case 412:
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_accept_encoding = 0, hash_donottrack = 0, hash_useragent = 0, hash_authorization = 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("Authorization");
}
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';
// fprintf(stderr, "HEADER: '%s' = '%s'\n", s, v);
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, "Authorization")) {
if (strlen(v) > 8) { // Must contain at least "Bearer "
char *auth_key=v+6;
*auth_key='\0';
if (!strcasecmp(v,"Bearer")) {
auth_key++;
w->auth_bearer_token=strdupz(auth_key);
}
}
}
#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 */
*e = ':';
*ve = '\r';
return ve;
}
// http_request_validate()
// returns:
// = 0 : all good, process the request
// > 0 : request is not supported
// < 0 : request is incomplete - wait for more data
typedef enum {
HTTP_VALIDATION_OK,
HTTP_VALIDATION_NOT_SUPPORTED,
HTTP_VALIDATION_INCOMPLETE
} HTTP_VALIDATION;
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;
if(last_pos > 4) last_pos -= 4; // allow searching for \r\n\r\n
else last_pos = 0;
w->header_parse_tries++;
w->header_parse_last_size = buffer_strlen(w->response.data);
if(w->header_parse_tries > 1) {
if(w->header_parse_last_size < last_pos)
last_pos = 0;
if(strstr(&s[last_pos], "\r\n\r\n") == NULL) {
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 is a valid request?
if(!strncmp(s, "GET ", 4)) {
encoded_url = s = &s[4];
w->mode = WEB_CLIENT_MODE_NORMAL;
}
else if(!strncmp(s, "OPTIONS ", 8)) {
encoded_url = s = &s[8];
w->mode = WEB_CLIENT_MODE_OPTIONS;
}
else if(!strncmp(s, "STREAM ", 7)) {
encoded_url = s = &s[7];
w->mode = WEB_CLIENT_MODE_STREAM;
}
else {
w->header_parse_tries = 0;
w->header_parse_last_size = 0;
web_client_disable_wait_receive(w);
return HTTP_VALIDATION_NOT_SUPPORTED;
}
// find the SPACE + "HTTP/"
while(*s) {
// find the next space
while (*s && *s != ' ') s++;
// is it SPACE + "HTTP/" ?
if(*s && !strncmp(s, " HTTP/", 6)) break;
else 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
*ue = '\0';
url_decode_r(w->decoded_url, encoded_url, NETDATA_WEB_REQUEST_URL_SIZE + 1);
*ue = ' ';
// copy the URL - we are going to overwrite parts of it
// TODO -- ideally we we should avoid copying buffers around
strncpyz(w->last_url, w->decoded_url, NETDATA_WEB_REQUEST_URL_SIZE);
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 void web_client_send_http_header(struct web_client *w) {
if(unlikely(w->response.code != 200))
buffer_no_cacheable(w->response.data);
// 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->tv_ready.tv_sec + localhost->rrd_update_every;
else
w->response.data->expires = w->tv_ready.tv_sec + 86400;
}
// prepare the HTTP response header
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->contenttype);
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);
}
buffer_sprintf(w->response.header_output,
"HTTP/1.1 %d %s\r\n"
"Connection: %s\r\n"
"Server: NetData Embedded HTTP Server v%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
, 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->cookie1[0] || w->cookie2[0]) {
if(w->cookie1[0]) {
buffer_sprintf(w->response.header_output,
"Set-Cookie: %s\r\n",
w->cookie1);
}
if(w->cookie2[0]) {
buffer_sprintf(w->response.header_output,
"Set-Cookie: %s\r\n",
w->cookie2);
}
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\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":"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"
"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");
// sent the HTTP header
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_crock_socket(w);
size_t count = 0;
ssize_t bytes;
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)) {
error("Cannot send HTTP headers to web client.");
break;
}
}
if(bytes != (ssize_t) buffer_strlen(w->response.header_output)) {
if(bytes > 0)
w->stats_sent_bytes += bytes;
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->stats_sent_bytes += bytes;
}
static inline int web_client_process_url(RRDHOST *host, struct web_client *w, char *url);
static inline int web_client_switch_host(RRDHOST *host, struct web_client *w, char *url) {
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 400;
}
char *tok = mystrsep(&url, "/");
if(tok && *tok) {
debug(D_WEB_CLIENT, "%llu: Searching for host with name '%s'.", w->id, tok);
// copy the URL, we need it to serve files
w->last_url[0] = '/';
if(url && *url) strncpyz(&w->last_url[1], url, NETDATA_WEB_REQUEST_URL_SIZE - 1);
else w->last_url[1] = '\0';
uint32_t hash = simple_hash(tok);
host = rrdhost_find_by_hostname(tok, hash);
if(!host) host = rrdhost_find_by_guid(tok, hash);
if(host) return web_client_process_url(host, w, url);
}
buffer_flush(w->response.data);
w->response.data->contenttype = 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 404;
}
static inline int web_client_process_url(RRDHOST *host, struct web_client *w, char *url) {
static uint32_t
hash_api = 0,
hash_netdata_conf = 0,
hash_host = 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");
#ifdef NETDATA_INTERNAL_CHECKS
hash_exit = simple_hash("exit");
hash_debug = simple_hash("debug");
hash_mirror = simple_hash("mirror");
#endif
}
char *tok = mystrsep(&url, "/?");
if(likely(tok && *tok)) {
uint32_t hash = simple_hash(tok);
debug(D_WEB_CLIENT, "%llu: Processing command '%s'.", w->id, tok);
if(unlikely(hash == hash_api && strcmp(tok, "api") == 0)) { // current API
debug(D_WEB_CLIENT_ACCESS, "%llu: API request ...", w->id);
return check_host_and_call(host, w, url, web_client_api_request);
}
else if(unlikely(hash == hash_host && strcmp(tok, "host") == 0)) { // host switching
debug(D_WEB_CLIENT_ACCESS, "%llu: host switch request ...", w->id);
return web_client_switch_host(host, w, url);
}
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);
debug(D_WEB_CLIENT_ACCESS, "%llu: generating netdata.conf ...", w->id);
w->response.data->contenttype = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
config_generate(w->response.data, 0);
return 200;
}
#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->contenttype = 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");
error("web request to exit received.");
netdata_cleanup_and_exit(0);
return 200;
}
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 = mystrsep(&url, "&");
if(tok && *tok) {
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->contenttype = CT_TEXT_HTML;
buffer_strcat(w->response.data, "Chart is not found: ");
buffer_strcat_htmlescape(w->response.data, tok);
debug(D_WEB_CLIENT_ACCESS, "%llu: %s is not found.", w->id, tok);
return 404;
}
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->contenttype = 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);
debug(D_WEB_CLIENT_ACCESS, "%llu: debug for %s is %s.", w->id, tok, rrdset_flag_check(st, RRDSET_FLAG_DEBUG)?"enabled":"disabled");
return 200;
}
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "debug which chart?\r\n");
return 400;
}
else if(unlikely(hash == hash_mirror && strcmp(tok, "mirror") == 0)) {
if(unlikely(!web_client_can_access_netdataconf(w)))
return web_client_permission_denied(w);
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 200;
}
#endif /* NETDATA_INTERNAL_CHECKS */
}
char filename[FILENAME_MAX+1];
url = filename;
strncpyz(filename, w->last_url, FILENAME_MAX);
tok = mystrsep(&url, "?");
buffer_flush(w->response.data);
return mysendfile(w, (tok && *tok)?tok:"/");
}
void web_client_process_request(struct web_client *w) {
// start timing us
now_realtime_timeval(&w->tv_in);
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(localhost, w, w->decoded_url);
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->contenttype = CT_TEXT_PLAIN;
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "OK");
w->response.code = 200;
break;
case WEB_CLIENT_MODE_FILECOPY:
case WEB_CLIENT_MODE_NORMAL:
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.code = web_client_process_url(localhost, w, w->decoded_url);
break;
}
break;
case HTTP_VALIDATION_INCOMPLETE:
if(w->response.data->len > NETDATA_WEB_REQUEST_MAX_SIZE) {
strcpy(w->last_url, "too big request");
debug(D_WEB_CLIENT_ACCESS, "%llu: Received request is too big (%zu bytes).", w->id, w->response.data->len);
buffer_flush(w->response.data);
buffer_sprintf(w->response.data, "Received request is too big (%zu bytes).\r\n", w->response.data->len);
w->response.code = 400;
}
else {
// wait for more data
return;
}
break;
case HTTP_VALIDATION_NOT_SUPPORTED:
debug(D_WEB_CLIENT_ACCESS, "%llu: Cannot understand '%s'.", w->id, w->response.data->buffer);
buffer_flush(w->response.data);
buffer_strcat(w->response.data, "I don't understand you...\r\n");
w->response.code = 400;
break;
}
// keep track of the time we done processing
now_realtime_timeval(&w->tv_ready);
w->response.sent = 0;
// set a proper last modified date
if(unlikely(!w->response.data->date))
w->response.data->date = w->tv_ready.tv_sec;
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:
debug(D_WEB_CLIENT, "%llu: STREAM done.", w->id);
break;
case WEB_CLIENT_MODE_OPTIONS:
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_NORMAL:
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) {
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)
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
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)
{
debug(D_DEFLATE, "%llu: OPEN CHUNK of %zu bytes (hex: %zx).", w->id, len, len);
char buf[24];
sprintf(buf, "%zX\r\n", len);
ssize_t bytes = send(w->ofd, buf, strlen(buf), 0);
if(bytes > 0) {
debug(D_DEFLATE, "%llu: Sent chunk header %zd bytes.", w->id, bytes);
w->stats_sent_bytes += bytes;
}
else if(bytes == 0) {
debug(D_WEB_CLIENT, "%llu: Did not send chunk header to the client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
else {
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 = send(w->ofd, "\r\n", 2, 0);
if(bytes > 0) {
debug(D_DEFLATE, "%llu: Sent chunk suffix %zd bytes.", w->id, bytes);
w->stats_sent_bytes += bytes;
}
else if(bytes == 0) {
debug(D_WEB_CLIENT, "%llu: Did not send chunk suffix to the client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
else {
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 = send(w->ofd, "\r\n0\r\n\r\n", 7, 0);
if(bytes > 0) {
debug(D_DEFLATE, "%llu: Sent chunk suffix %zd bytes.", w->id, bytes);
w->stats_sent_bytes += bytes;
}
else if(bytes == 0) {
debug(D_WEB_CLIENT, "%llu: Did not send chunk finalize suffix to the client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
else {
debug(D_WEB_CLIENT, "%llu: Failed to send chunk finalize suffix to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return bytes;
}
#ifdef NETDATA_WITH_ZLIB
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
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
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
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))) {
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);
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;
}
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_NORMAL
|| (w->mode == WEB_CLIENT_MODE_FILECOPY && !web_client_has_wait_receive(w) && w->response.data->len == w->response.rlen)) {
flush = Z_FINISH;
debug(D_DEFLATE, "%llu: Requesting Z_FINISH, if possible.", w->id);
}
else {
debug(D_DEFLATE, "%llu: Requesting Z_SYNC_FLUSH.", w->id);
}
// compress
if(deflate(&w->response.zstream, flush) == Z_STREAM_ERROR) {
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;
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;
}
debug(D_WEB_CLIENT, "%llu: Sending %zu bytes of data (+%zd of chunk header).", w->id, w->response.zhave - w->response.zsent, t);
len = send(w->ofd, &w->response.zbuffer[w->response.zsent], (size_t) (w->response.zhave - w->response.zsent), MSG_DONTWAIT);
if(len > 0) {
w->stats_sent_bytes += len;
w->response.zsent += len;
len += t;
debug(D_WEB_CLIENT, "%llu: Sent %zd bytes.", w->id, len);
}
else if(len == 0) {
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);
WEB_CLIENT_IS_DEAD(w);
}
else {
debug(D_WEB_CLIENT, "%llu: Failed to send data to client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return(len);
}
#endif // NETDATA_WITH_ZLIB
ssize_t web_client_send(struct web_client *w) {
#ifdef NETDATA_WITH_ZLIB
if(likely(w->response.zoutput)) return web_client_send_deflate(w);
#endif // NETDATA_WITH_ZLIB
ssize_t bytes;
if(unlikely(w->response.data->len - w->response.sent == 0)) {
// there is nothing to send
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
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))) {
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);
debug(D_WEB_CLIENT, "%llu: Done sending all data on socket. Waiting for next request on the same socket.", w->id);
return 0;
}
bytes = send(w->ofd, &w->response.data->buffer[w->response.sent], w->response.data->len - w->response.sent, MSG_DONTWAIT);
if(likely(bytes > 0)) {
w->stats_sent_bytes += bytes;
w->response.sent += bytes;
debug(D_WEB_CLIENT, "%llu: Sent %zd bytes.", w->id, bytes);
}
else if(likely(bytes == 0)) {
debug(D_WEB_CLIENT, "%llu: Did not send any bytes to the client.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
else {
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 = 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';
debug(D_WEB_CLIENT, "%llu: Read %zd bytes.", w->id, bytes);
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)) {
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);
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 {
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);
// do we have any space for more data?
buffer_need_bytes(w->response.data, NETDATA_WEB_REQUEST_RECEIVE_SIZE);
ssize_t left = w->response.data->size - w->response.data->len;
ssize_t bytes = recv(w->ifd, &w->response.data->buffer[w->response.data->len], (size_t) (left - 1), MSG_DONTWAIT);
if(likely(bytes > 0)) {
w->stats_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';
debug(D_WEB_CLIENT, "%llu: Received %zd bytes.", w->id, bytes);
debug(D_WEB_DATA, "%llu: Received data: '%s'.", w->id, &w->response.data->buffer[old]);
}
else {
debug(D_WEB_CLIENT, "%llu: receive data failed.", w->id);
WEB_CLIENT_IS_DEAD(w);
}
return(bytes);
}
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