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godot/thirdparty/lws/server/server.c
Fabio Alessandrelli fa33e0f62d Add libwebsockets as thirdparty library. 
License is LGPLv2.1 + static linking exception, version is 2.4.1
2018-02-05 16:11:41 +01:00

3026 lines
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/*
* libwebsockets - small server side websockets and web server implementation
*
* Copyright (C) 2010-2017 Andy Green <andy@warmcat.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation:
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "private-libwebsockets.h"
const char * const method_names[] = {
"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE", "CONNECT", "HEAD",
#ifdef LWS_WITH_HTTP2
":path",
#endif
};
#if defined (LWS_WITH_ESP8266)
#undef memcpy
void *memcpy(void *dest, const void *src, size_t n)
{
return ets_memcpy(dest, src, n);
}
#endif
int
lws_context_init_server(struct lws_context_creation_info *info,
struct lws_vhost *vhost)
{
#if LWS_POSIX
int n, opt = 1, limit = 1;
#endif
lws_sockfd_type sockfd;
struct lws_vhost *vh;
struct lws *wsi;
int m = 0;
(void)method_names;
(void)opt;
/* set up our external listening socket we serve on */
if (info->port == CONTEXT_PORT_NO_LISTEN ||
info->port == CONTEXT_PORT_NO_LISTEN_SERVER)
return 0;
vh = vhost->context->vhost_list;
while (vh) {
if (vh->listen_port == info->port) {
if ((!info->iface && !vh->iface) ||
(info->iface && vh->iface &&
!strcmp(info->iface, vh->iface))) {
vhost->listen_port = info->port;
vhost->iface = info->iface;
lwsl_notice(" using listen skt from vhost %s\n",
vh->name);
return 0;
}
}
vh = vh->vhost_next;
}
#if LWS_POSIX
(void)n;
#if defined(__linux__)
limit = vhost->context->count_threads;
#endif
for (m = 0; m < limit; m++) {
#ifdef LWS_WITH_UNIX_SOCK
if (LWS_UNIX_SOCK_ENABLED(vhost))
sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
else
#endif
#ifdef LWS_WITH_IPV6
if (LWS_IPV6_ENABLED(vhost))
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
else
#endif
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
#else
#if defined(LWS_WITH_ESP8266)
sockfd = esp8266_create_tcp_listen_socket(vhost);
if (!lws_sockfd_valid(sockfd)) {
#endif
#endif
lwsl_err("ERROR opening socket\n");
return 1;
}
#if LWS_POSIX && !defined(LWS_WITH_ESP32)
#if (defined(WIN32) || defined(_WIN32)) && defined(SO_EXCLUSIVEADDRUSE)
/*
* only accept that we are the only listener on the port
* https://msdn.microsoft.com/zh-tw/library/
* windows/desktop/ms740621(v=vs.85).aspx
*
* for lws, to match Linux, we default to exclusive listen
*/
if (!lws_check_opt(vhost->options,
LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE)) {
if (setsockopt(sockfd, SOL_SOCKET, SO_EXCLUSIVEADDRUSE,
(const void *)&opt, sizeof(opt)) < 0) {
lwsl_err("reuseaddr failed\n");
compatible_close(sockfd);
return 1;
}
} else
#endif
/*
* allow us to restart even if old sockets in TIME_WAIT
*/
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(const void *)&opt, sizeof(opt)) < 0) {
lwsl_err("reuseaddr failed\n");
compatible_close(sockfd);
return 1;
}
#if defined(LWS_WITH_IPV6) && defined(IPV6_V6ONLY)
if (LWS_IPV6_ENABLED(vhost)) {
if (vhost->options & LWS_SERVER_OPTION_IPV6_V6ONLY_MODIFY) {
int value = (vhost->options &
LWS_SERVER_OPTION_IPV6_V6ONLY_VALUE) ? 1 : 0;
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY,
(const void*)&value, sizeof(value)) < 0) {
compatible_close(sockfd);
return 1;
}
}
}
#endif
#if defined(__linux__) && defined(SO_REUSEPORT)
n = lws_check_opt(vhost->options, LWS_SERVER_OPTION_ALLOW_LISTEN_SHARE);
#if LWS_MAX_SMP > 1
n = 1;
#endif
if (n)
if (vhost->context->count_threads > 1)
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT,
(const void *)&opt, sizeof(opt)) < 0) {
compatible_close(sockfd);
return 1;
}
#endif
#endif
lws_plat_set_socket_options(vhost, sockfd);
#if LWS_POSIX
n = lws_socket_bind(vhost, sockfd, info->port, info->iface);
if (n < 0)
goto bail;
info->port = n;
#endif
vhost->listen_port = info->port;
vhost->iface = info->iface;
wsi = lws_zalloc(sizeof(struct lws), "listen wsi");
if (wsi == NULL) {
lwsl_err("Out of mem\n");
goto bail;
}
wsi->context = vhost->context;
wsi->desc.sockfd = sockfd;
wsi->mode = LWSCM_SERVER_LISTENER;
wsi->protocol = vhost->protocols;
wsi->tsi = m;
wsi->vhost = vhost;
wsi->listener = 1;
#ifdef LWS_WITH_LIBUV
if (LWS_LIBUV_ENABLED(vhost->context))
lws_uv_initvhost(vhost, wsi);
#endif
if (insert_wsi_socket_into_fds(vhost->context, wsi))
goto bail;
vhost->context->count_wsi_allocated++;
vhost->lserv_wsi = wsi;
#if LWS_POSIX
n = listen(wsi->desc.sockfd, LWS_SOMAXCONN);
if (n < 0) {
lwsl_err("listen failed with error %d\n", LWS_ERRNO);
vhost->lserv_wsi = NULL;
vhost->context->count_wsi_allocated--;
remove_wsi_socket_from_fds(wsi);
goto bail;
}
} /* for each thread able to independently listen */
#else
#if defined(LWS_WITH_ESP8266)
esp8266_tcp_stream_bind(wsi->desc.sockfd, info->port, wsi);
#endif
#endif
if (!lws_check_opt(info->options, LWS_SERVER_OPTION_EXPLICIT_VHOSTS)) {
#ifdef LWS_WITH_UNIX_SOCK
if (LWS_UNIX_SOCK_ENABLED(vhost))
lwsl_info(" Listening on \"%s\"\n", info->iface);
else
#endif
lwsl_info(" Listening on port %d\n", info->port);
}
return 0;
bail:
compatible_close(sockfd);
return 1;
}
#if defined(LWS_WITH_ESP8266)
#undef strchr
#define strchr ets_strchr
#endif
struct lws_vhost *
lws_select_vhost(struct lws_context *context, int port, const char *servername)
{
struct lws_vhost *vhost = context->vhost_list;
const char *p;
int n, m, colon;
n = strlen(servername);
colon = n;
p = strchr(servername, ':');
if (p)
colon = p - servername;
/* Priotity 1: first try exact matches */
while (vhost) {
if (port == vhost->listen_port &&
!strncmp(vhost->name, servername, colon)) {
lwsl_info("SNI: Found: %s\n", servername);
return vhost;
}
vhost = vhost->vhost_next;
}
/*
* Priority 2: if no exact matches, try matching *.vhost-name
* unintentional matches are possible but resolve to x.com for *.x.com
* which is reasonable. If exact match exists we already chose it and
* never reach here. SSL will still fail it if the cert doesn't allow
* *.x.com.
*/
vhost = context->vhost_list;
while (vhost) {
m = strlen(vhost->name);
if (port == vhost->listen_port &&
m <= (colon - 2) &&
servername[colon - m - 1] == '.' &&
!strncmp(vhost->name, servername + colon - m, m)) {
lwsl_info("SNI: Found %s on wildcard: %s\n",
servername, vhost->name);
return vhost;
}
vhost = vhost->vhost_next;
}
/* Priority 3: match the first vhost on our port */
vhost = context->vhost_list;
while (vhost) {
if (port == vhost->listen_port) {
lwsl_info("vhost match to %s based on port %d\n",
vhost->name, port);
return vhost;
}
vhost = vhost->vhost_next;
}
/* no match */
return NULL;
}
LWS_VISIBLE LWS_EXTERN const char *
lws_get_mimetype(const char *file, const struct lws_http_mount *m)
{
int n = strlen(file);
const struct lws_protocol_vhost_options *pvo = NULL;
if (m)
pvo = m->extra_mimetypes;
if (n < 5)
return NULL;
if (!strcmp(&file[n - 4], ".ico"))
return "image/x-icon";
if (!strcmp(&file[n - 4], ".gif"))
return "image/gif";
if (!strcmp(&file[n - 3], ".js"))
return "text/javascript";
if (!strcmp(&file[n - 4], ".png"))
return "image/png";
if (!strcmp(&file[n - 4], ".jpg"))
return "image/jpeg";
if (!strcmp(&file[n - 3], ".gz"))
return "application/gzip";
if (!strcmp(&file[n - 4], ".JPG"))
return "image/jpeg";
if (!strcmp(&file[n - 5], ".html"))
return "text/html";
if (!strcmp(&file[n - 4], ".css"))
return "text/css";
if (!strcmp(&file[n - 4], ".txt"))
return "text/plain";
if (!strcmp(&file[n - 4], ".svg"))
return "image/svg+xml";
if (!strcmp(&file[n - 4], ".ttf"))
return "application/x-font-ttf";
if (!strcmp(&file[n - 4], ".otf"))
return "application/font-woff";
if (!strcmp(&file[n - 5], ".woff"))
return "application/font-woff";
if (!strcmp(&file[n - 4], ".xml"))
return "application/xml";
while (pvo) {
if (pvo->name[0] == '*') /* ie, match anything */
return pvo->value;
if (!strcmp(&file[n - strlen(pvo->name)], pvo->name))
return pvo->value;
pvo = pvo->next;
}
return NULL;
}
static lws_fop_flags_t
lws_vfs_prepare_flags(struct lws *wsi)
{
lws_fop_flags_t f = 0;
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING))
return f;
if (strstr(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_ACCEPT_ENCODING),
"gzip")) {
lwsl_info("client indicates GZIP is acceptable\n");
f |= LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP;
}
return f;
}
static int
lws_http_serve(struct lws *wsi, char *uri, const char *origin,
const struct lws_http_mount *m)
{
const struct lws_protocol_vhost_options *pvo = m->interpret;
struct lws_process_html_args args;
const char *mimetype;
#if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266)
const struct lws_plat_file_ops *fops;
const char *vpath;
lws_fop_flags_t fflags = LWS_O_RDONLY;
#if defined(WIN32) && defined(LWS_HAVE__STAT32I64)
struct _stat32i64 st;
#else
struct stat st;
#endif
int spin = 0;
#endif
char path[256], sym[512];
unsigned char *p = (unsigned char *)sym + 32 + LWS_PRE, *start = p;
unsigned char *end = p + sizeof(sym) - 32 - LWS_PRE;
#if !defined(WIN32) && LWS_POSIX && !defined(LWS_WITH_ESP32)
size_t len;
#endif
int n;
lws_snprintf(path, sizeof(path) - 1, "%s/%s", origin, uri);
#if !defined(_WIN32_WCE) && !defined(LWS_WITH_ESP8266)
fflags |= lws_vfs_prepare_flags(wsi);
do {
spin++;
fops = lws_vfs_select_fops(wsi->context->fops, path, &vpath);
if (wsi->u.http.fop_fd)
lws_vfs_file_close(&wsi->u.http.fop_fd);
wsi->u.http.fop_fd = fops->LWS_FOP_OPEN(wsi->context->fops,
path, vpath, &fflags);
if (!wsi->u.http.fop_fd) {
lwsl_err("Unable to open '%s'\n", path);
return -1;
}
/* if it can't be statted, don't try */
if (fflags & LWS_FOP_FLAG_VIRTUAL)
break;
#if defined(LWS_WITH_ESP32)
break;
#endif
#if !defined(WIN32)
if (fstat(wsi->u.http.fop_fd->fd, &st)) {
lwsl_info("unable to stat %s\n", path);
goto bail;
}
#else
#if defined(LWS_HAVE__STAT32I64)
if (_stat32i64(path, &st)) {
lwsl_info("unable to stat %s\n", path);
goto bail;
}
#else
if (stat(path, &st)) {
lwsl_info("unable to stat %s\n", path);
goto bail;
}
#endif
#endif
wsi->u.http.fop_fd->mod_time = (uint32_t)st.st_mtime;
fflags |= LWS_FOP_FLAG_MOD_TIME_VALID;
#if !defined(WIN32) && LWS_POSIX && !defined(LWS_WITH_ESP32)
if ((S_IFMT & st.st_mode) == S_IFLNK) {
len = readlink(path, sym, sizeof(sym) - 1);
if (len) {
lwsl_err("Failed to read link %s\n", path);
goto bail;
}
sym[len] = '\0';
lwsl_debug("symlink %s -> %s\n", path, sym);
lws_snprintf(path, sizeof(path) - 1, "%s", sym);
}
#endif
if ((S_IFMT & st.st_mode) == S_IFDIR) {
lwsl_debug("default filename append to dir\n");
lws_snprintf(path, sizeof(path) - 1, "%s/%s/index.html",
origin, uri);
}
} while ((S_IFMT & st.st_mode) != S_IFREG && spin < 5);
if (spin == 5)
lwsl_err("symlink loop %s \n", path);
n = sprintf(sym, "%08llX%08lX",
(unsigned long long)lws_vfs_get_length(wsi->u.http.fop_fd),
(unsigned long)lws_vfs_get_mod_time(wsi->u.http.fop_fd));
/* disable ranges if IF_RANGE token invalid */
if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_RANGE))
if (strcmp(sym, lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_IF_RANGE)))
/* differs - defeat Range: */
wsi->u.http.ah->frag_index[WSI_TOKEN_HTTP_RANGE] = 0;
if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_IF_NONE_MATCH)) {
/*
* he thinks he has some version of it already,
* check if the tag matches
*/
if (!strcmp(sym, lws_hdr_simple_ptr(wsi,
WSI_TOKEN_HTTP_IF_NONE_MATCH))) {
lwsl_debug("%s: ETAG match %s %s\n", __func__,
uri, origin);
/* we don't need to send the payload */
if (lws_add_http_header_status(wsi,
HTTP_STATUS_NOT_MODIFIED, &p, end))
return -1;
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_ETAG,
(unsigned char *)sym, n, &p, end))
return -1;
if (lws_finalize_http_header(wsi, &p, end))
return -1;
n = lws_write(wsi, start, p - start,
LWS_WRITE_HTTP_HEADERS |
LWS_WRITE_H2_STREAM_END);
if (n != (p - start)) {
lwsl_err("_write returned %d from %ld\n", n,
(long)(p - start));
return -1;
}
lws_vfs_file_close(&wsi->u.http.fop_fd);
return lws_http_transaction_completed(wsi);
}
}
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ETAG,
(unsigned char *)sym, n, &p, end))
return -1;
#endif
mimetype = lws_get_mimetype(path, m);
if (!mimetype) {
lwsl_err("unknown mimetype for %s\n", path);
goto bail;
}
if (!mimetype[0])
lwsl_debug("sending no mimetype for %s\n", path);
wsi->sending_chunked = 0;
/*
* check if this is in the list of file suffixes to be interpreted by
* a protocol
*/
while (pvo) {
n = strlen(path);
if (n > (int)strlen(pvo->name) &&
!strcmp(&path[n - strlen(pvo->name)], pvo->name)) {
wsi->sending_chunked = 1;
wsi->protocol_interpret_idx =
(char)(lws_intptr_t)pvo->value;
lwsl_info("want %s interpreted by %s\n", path,
wsi->vhost->protocols[
(int)(lws_intptr_t)(pvo->value)].name);
wsi->protocol = &wsi->vhost->protocols[
(int)(lws_intptr_t)(pvo->value)];
if (lws_ensure_user_space(wsi))
return -1;
break;
}
pvo = pvo->next;
}
if (m->protocol) {
const struct lws_protocols *pp = lws_vhost_name_to_protocol(
wsi->vhost, m->protocol);
if (lws_bind_protocol(wsi, pp))
return 1;
args.p = (char *)p;
args.max_len = end - p;
if (pp->callback(wsi, LWS_CALLBACK_ADD_HEADERS,
wsi->user_space, &args, 0))
return -1;
p = (unsigned char *)args.p;
}
n = lws_serve_http_file(wsi, path, mimetype, (char *)start, p - start);
if (n < 0 || ((n > 0) && lws_http_transaction_completed(wsi)))
return -1; /* error or can't reuse connection: close the socket */
return 0;
bail:
return -1;
}
const struct lws_http_mount *
lws_find_mount(struct lws *wsi, const char *uri_ptr, int uri_len)
{
const struct lws_http_mount *hm, *hit = NULL;
int best = 0;
hm = wsi->vhost->mount_list;
while (hm) {
if (uri_len >= hm->mountpoint_len &&
!strncmp(uri_ptr, hm->mountpoint, hm->mountpoint_len) &&
(uri_ptr[hm->mountpoint_len] == '\0' ||
uri_ptr[hm->mountpoint_len] == '/' ||
hm->mountpoint_len == 1)
) {
if (hm->origin_protocol == LWSMPRO_CALLBACK ||
((hm->origin_protocol == LWSMPRO_CGI ||
lws_hdr_total_length(wsi, WSI_TOKEN_GET_URI) ||
(wsi->http2_substream &&
lws_hdr_total_length(wsi,
WSI_TOKEN_HTTP_COLON_PATH)) ||
hm->protocol) &&
hm->mountpoint_len > best)) {
best = hm->mountpoint_len;
hit = hm;
}
}
hm = hm->mount_next;
}
return hit;
}
#if LWS_POSIX
static int
lws_find_string_in_file(const char *filename, const char *string, int stringlen)
{
char buf[128];
int fd, match = 0, pos = 0, n = 0, hit = 0;
fd = open(filename, O_RDONLY);
if (fd < 0) {
lwsl_err("can't open auth file: %s\n", filename);
return 1;
}
while (1) {
if (pos == n) {
n = read(fd, buf, sizeof(buf));
if (n <= 0) {
if (match == stringlen)
hit = 1;
break;
}
pos = 0;
}
if (match == stringlen) {
if (buf[pos] == '\r' || buf[pos] == '\n') {
hit = 1;
break;
}
match = 0;
}
if (buf[pos] == string[match])
match++;
else
match = 0;
pos++;
}
close(fd);
return hit;
}
static int
lws_unauthorised_basic_auth(struct lws *wsi)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
unsigned char *start = pt->serv_buf + LWS_PRE,
*p = start, *end = p + 512;
char buf[64];
int n;
/* no auth... tell him it is required */
if (lws_add_http_header_status(wsi, HTTP_STATUS_UNAUTHORIZED, &p, end))
return -1;
n = lws_snprintf(buf, sizeof(buf), "Basic realm=\"lwsws\"");
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_WWW_AUTHENTICATE,
(unsigned char *)buf, n, &p, end))
return -1;
if (lws_finalize_http_header(wsi, &p, end))
return -1;
n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS |
LWS_WRITE_H2_STREAM_END);
if (n < 0)
return -1;
return lws_http_transaction_completed(wsi);
}
#endif
int lws_clean_url(char *p)
{
if (p[0] == 'h' && p[1] == 't' && p[2] == 't' && p[3] == 'p') {
p += 4;
if (*p == 's')
p++;
if (*p == ':') {
p++;
if (*p == '/')
p++;
}
}
while (*p) {
if (p[0] == '/' && p[1] == '/') {
char *p1 = p;
while (*p1) {
*p1 = p1[1];
p1++;
}
continue;
}
p++;
}
return 0;
}
static const unsigned char methods[] = {
WSI_TOKEN_GET_URI,
WSI_TOKEN_POST_URI,
WSI_TOKEN_OPTIONS_URI,
WSI_TOKEN_PUT_URI,
WSI_TOKEN_PATCH_URI,
WSI_TOKEN_DELETE_URI,
WSI_TOKEN_CONNECT,
WSI_TOKEN_HEAD_URI,
#ifdef LWS_WITH_HTTP2
WSI_TOKEN_HTTP_COLON_PATH,
#endif
};
static int
lws_http_get_uri_and_method(struct lws *wsi, char **puri_ptr, int *puri_len)
{
int n, count = 0;
for (n = 0; n < ARRAY_SIZE(methods); n++)
if (lws_hdr_total_length(wsi, methods[n]))
count++;
if (!count) {
lwsl_warn("Missing URI in HTTP request\n");
return -1;
}
if (count != 1 &&
!(wsi->http2_substream &&
lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_COLON_PATH))) {
lwsl_warn("multiple methods?\n");
return -1;
}
for (n = 0; n < ARRAY_SIZE(methods); n++)
if (lws_hdr_total_length(wsi, methods[n])) {
*puri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
*puri_len = lws_hdr_total_length(wsi, methods[n]);
return n;
}
return -1;
}
int
lws_http_action(struct lws *wsi)
{
struct lws_context_per_thread *pt = &wsi->context->pt[(int)wsi->tsi];
enum http_connection_type connection_type;
enum http_version request_version;
char content_length_str[32];
struct lws_process_html_args args;
const struct lws_http_mount *hit = NULL;
unsigned int n;
char http_version_str[10];
char http_conn_str[20];
int http_version_len;
char *uri_ptr = NULL, *s;
int uri_len = 0, meth;
static const char * const oprot[] = {
"http://", "https://"
};
meth = lws_http_get_uri_and_method(wsi, &uri_ptr, &uri_len);
if (meth < 0 || meth >= ARRAY_SIZE(method_names))
goto bail_nuke_ah;
/* we insist on absolute paths */
if (!uri_ptr || uri_ptr[0] != '/') {
lws_return_http_status(wsi, HTTP_STATUS_FORBIDDEN, NULL);
goto bail_nuke_ah;
}
lwsl_info("Method: '%s' (%d), request for '%s'\n", method_names[meth],
meth, uri_ptr);
if (lws_ensure_user_space(wsi))
goto bail_nuke_ah;
/* HTTP header had a content length? */
wsi->u.http.rx_content_length = 0;
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI) ||
lws_hdr_total_length(wsi, WSI_TOKEN_PATCH_URI) ||
lws_hdr_total_length(wsi, WSI_TOKEN_PUT_URI))
wsi->u.http.rx_content_length = 100 * 1024 * 1024;
if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) {
lws_hdr_copy(wsi, content_length_str,
sizeof(content_length_str) - 1,
WSI_TOKEN_HTTP_CONTENT_LENGTH);
wsi->u.http.rx_content_length = atoll(content_length_str);
}
if (wsi->http2_substream) {
wsi->u.http.request_version = HTTP_VERSION_2;
} else {
/* http_version? Default to 1.0, override with token: */
request_version = HTTP_VERSION_1_0;
/* Works for single digit HTTP versions. : */
http_version_len = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP);
if (http_version_len > 7) {
lws_hdr_copy(wsi, http_version_str,
sizeof(http_version_str) - 1,
WSI_TOKEN_HTTP);
if (http_version_str[5] == '1' &&
http_version_str[7] == '1')
request_version = HTTP_VERSION_1_1;
}
wsi->u.http.request_version = request_version;
/* HTTP/1.1 defaults to "keep-alive", 1.0 to "close" */
if (request_version == HTTP_VERSION_1_1)
connection_type = HTTP_CONNECTION_KEEP_ALIVE;
else
connection_type = HTTP_CONNECTION_CLOSE;
/* Override default if http "Connection:" header: */
if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
lws_hdr_copy(wsi, http_conn_str,
sizeof(http_conn_str) - 1,
WSI_TOKEN_CONNECTION);
http_conn_str[sizeof(http_conn_str) - 1] = '\0';
if (!strcasecmp(http_conn_str, "keep-alive"))
connection_type = HTTP_CONNECTION_KEEP_ALIVE;
else
if (!strcasecmp(http_conn_str, "close"))
connection_type = HTTP_CONNECTION_CLOSE;
}
wsi->u.http.connection_type = connection_type;
}
n = wsi->protocol->callback(wsi, LWS_CALLBACK_FILTER_HTTP_CONNECTION,
wsi->user_space, uri_ptr, uri_len);
if (n) {
lwsl_info("LWS_CALLBACK_HTTP closing\n");
return 1;
}
/*
* if there is content supposed to be coming,
* put a timeout on it having arrived
*/
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
wsi->context->timeout_secs);
#ifdef LWS_OPENSSL_SUPPORT
if (wsi->redirect_to_https) {
/*
* we accepted http:// only so we could redirect to
* https://, so issue the redirect. Create the redirection
* URI from the host: header and ignore the path part
*/
unsigned char *start = pt->serv_buf + LWS_PRE, *p = start,
*end = p + 512;
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST))
goto bail_nuke_ah;
n = sprintf((char *)end, "https://%s/",
lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
end, n, &p, end);
if ((int)n < 0)
goto bail_nuke_ah;
return lws_http_transaction_completed(wsi);
}
#endif
#ifdef LWS_WITH_ACCESS_LOG
lws_prepare_access_log_info(wsi, uri_ptr, meth);
#endif
/* can we serve it from the mount list? */
hit = lws_find_mount(wsi, uri_ptr, uri_len);
if (!hit) {
/* deferred cleanup and reset to protocols[0] */
lwsl_info("no hit\n");
if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0]))
return 1;
n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
wsi->user_space, uri_ptr, uri_len);
goto after;
}
s = uri_ptr + hit->mountpoint_len;
/*
* if we have a mountpoint like https://xxx.com/yyy
* there is an implied / at the end for our purposes since
* we can only mount on a "directory".
*
* But if we just go with that, the browser cannot understand
* that he is actually looking down one "directory level", so
* even though we give him /yyy/abc.html he acts like the
* current directory level is /. So relative urls like "x.png"
* wrongly look outside the mountpoint.
*
* Therefore if we didn't come in on a url with an explicit
* / at the end, we must redirect to add it so the browser
* understands he is one "directory level" down.
*/
if ((hit->mountpoint_len > 1 ||
(hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) &&
(*s != '/' ||
(hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
hit->origin_protocol == LWSMPRO_REDIR_HTTPS)) &&
(hit->origin_protocol != LWSMPRO_CGI &&
hit->origin_protocol != LWSMPRO_CALLBACK)) {
unsigned char *start = pt->serv_buf + LWS_PRE,
*p = start, *end = p + 512;
lwsl_debug("Doing 301 '%s' org %s\n", s, hit->origin);
/* > at start indicates deal with by redirect */
if (hit->origin_protocol == LWSMPRO_REDIR_HTTP ||
hit->origin_protocol == LWSMPRO_REDIR_HTTPS)
n = lws_snprintf((char *)end, 256, "%s%s",
oprot[hit->origin_protocol & 1],
hit->origin);
else {
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) {
if (!lws_hdr_total_length(wsi,
WSI_TOKEN_HTTP_COLON_AUTHORITY))
goto bail_nuke_ah;
n = lws_snprintf((char *)end, 256,
"%s%s%s/", oprot[!!lws_is_ssl(wsi)],
lws_hdr_simple_ptr(wsi,
WSI_TOKEN_HTTP_COLON_AUTHORITY),
uri_ptr);
} else
n = lws_snprintf((char *)end, 256,
"%s%s%s/", oprot[!!lws_is_ssl(wsi)],
lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST),
uri_ptr);
}
lws_clean_url((char *)end);
n = lws_http_redirect(wsi, HTTP_STATUS_MOVED_PERMANENTLY,
end, n, &p, end);
if ((int)n < 0)
goto bail_nuke_ah;
return lws_http_transaction_completed(wsi);
}
#if LWS_POSIX
/* basic auth? */
if (hit->basic_auth_login_file) {
char b64[160], plain[(sizeof(b64) * 3) / 4];
int m;
/* Did he send auth? */
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_AUTHORIZATION))
return lws_unauthorised_basic_auth(wsi);
n = HTTP_STATUS_FORBIDDEN;
m = lws_hdr_copy(wsi, b64, sizeof(b64),
WSI_TOKEN_HTTP_AUTHORIZATION);
if (m < 7) {
lwsl_err("b64 auth too long\n");
goto transaction_result_n;
}
b64[5] = '\0';
if (strcasecmp(b64, "Basic")) {
lwsl_err("auth missing basic: %s\n", b64);
goto transaction_result_n;
}
/* It'll be like Authorization: Basic QWxhZGRpbjpPcGVuU2VzYW1l */
m = lws_b64_decode_string(b64 + 6, plain, sizeof(plain));
if (m < 0) {
lwsl_err("plain auth too long\n");
goto transaction_result_n;
}
if (!lws_find_string_in_file(hit->basic_auth_login_file,
plain, m)) {
lwsl_err("basic auth lookup failed\n");
return lws_unauthorised_basic_auth(wsi);
}
lwsl_notice("basic auth accepted\n");
/* accept the auth */
}
#endif
#if defined(LWS_WITH_HTTP_PROXY)
/*
* The mount is a reverse proxy?
*/
if (hit->origin_protocol == LWSMPRO_HTTPS ||
hit->origin_protocol == LWSMPRO_HTTP) {
struct lws_client_connect_info i;
char ads[96], rpath[256], *pcolon, *pslash, *p;
int n, na;
memset(&i, 0, sizeof(i));
i.context = lws_get_context(wsi);
pcolon = strchr(hit->origin, ':');
pslash = strchr(hit->origin, '/');
if (!pslash) {
lwsl_err("Proxy mount origin '%s' must have /\n",
hit->origin);
return -1;
}
if (pcolon > pslash)
pcolon = NULL;
if (pcolon)
n = pcolon - hit->origin;
else
n = pslash - hit->origin;
if (n >= sizeof(ads) - 2)
n = sizeof(ads) - 2;
memcpy(ads, hit->origin, n);
ads[n] = '\0';
i.address = ads;
i.port = 80;
if (hit->origin_protocol == LWSMPRO_HTTPS) {
i.port = 443;
i.ssl_connection = 1;
}
if (pcolon)
i.port = atoi(pcolon + 1);
lws_snprintf(rpath, sizeof(rpath) - 1, "/%s/%s", pslash + 1,
uri_ptr + hit->mountpoint_len);
lws_clean_url(rpath);
na = lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_URI_ARGS);
if (na) {
p = rpath + strlen(rpath);
*p++ = '?';
lws_hdr_copy(wsi, p, &rpath[sizeof(rpath) - 1] - p,
WSI_TOKEN_HTTP_URI_ARGS);
while (--na) {
if (*p == '\0')
*p = '&';
p++;
}
}
i.path = rpath;
i.host = i.address;
i.origin = NULL;
i.method = "GET";
i.parent_wsi = wsi;
i.uri_replace_from = hit->origin;
i.uri_replace_to = hit->mountpoint;
lwsl_notice("proxying to %s port %d url %s, ssl %d, from %s, to %s\n",
i.address, i.port, i.path, i.ssl_connection,
i.uri_replace_from, i.uri_replace_to);
if (!lws_client_connect_via_info(&i)) {
lwsl_err("proxy connect fail\n");
return 1;
}
return 0;
}
#endif
/*
* A particular protocol callback is mounted here?
*
* For the duration of this http transaction, bind us to the
* associated protocol
*/
if (hit->origin_protocol == LWSMPRO_CALLBACK || hit->protocol) {
const struct lws_protocols *pp;
const char *name = hit->origin;
if (hit->protocol)
name = hit->protocol;
pp = lws_vhost_name_to_protocol(wsi->vhost, name);
if (!pp) {
n = -1;
lwsl_err("Unable to find plugin '%s'\n",
hit->origin);
return 1;
}
if (lws_bind_protocol(wsi, pp))
return 1;
args.p = uri_ptr;
args.len = uri_len;
args.max_len = hit->auth_mask;
args.final = 0; /* used to signal callback dealt with it */
n = wsi->protocol->callback(wsi, LWS_CALLBACK_CHECK_ACCESS_RIGHTS,
wsi->user_space, &args, 0);
if (n) {
lws_return_http_status(wsi, HTTP_STATUS_UNAUTHORIZED,
NULL);
goto bail_nuke_ah;
}
if (args.final) /* callback completely handled it well */
return 0;
if (hit->cgienv && wsi->protocol->callback(wsi,
LWS_CALLBACK_HTTP_PMO,
wsi->user_space, (void *)hit->cgienv, 0))
return 1;
if (lws_hdr_total_length(wsi, WSI_TOKEN_POST_URI)) {
n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
wsi->user_space,
uri_ptr + hit->mountpoint_len,
uri_len - hit->mountpoint_len);
goto after;
}
}
#ifdef LWS_WITH_CGI
/* did we hit something with a cgi:// origin? */
if (hit->origin_protocol == LWSMPRO_CGI) {
const char *cmd[] = {
NULL, /* replace with cgi path */
NULL
};
lwsl_debug("%s: cgi\n", __func__);
cmd[0] = hit->origin;
n = 5;
if (hit->cgi_timeout)
n = hit->cgi_timeout;
n = lws_cgi(wsi, cmd, hit->mountpoint_len, n,
hit->cgienv);
if (n) {
lwsl_err("%s: cgi failed\n", __func__);
return -1;
}
goto deal_body;
}
#endif
n = strlen(s);
if (s[0] == '\0' || (n == 1 && s[n - 1] == '/'))
s = (char *)hit->def;
if (!s)
s = "index.html";
wsi->cache_secs = hit->cache_max_age;
wsi->cache_reuse = hit->cache_reusable;
wsi->cache_revalidate = hit->cache_revalidate;
wsi->cache_intermediaries = hit->cache_intermediaries;
n = lws_http_serve(wsi, s, hit->origin, hit);
if (n) {
/*
* lws_return_http_status(wsi, HTTP_STATUS_NOT_FOUND, NULL);
*/
if (hit->protocol) {
const struct lws_protocols *pp = lws_vhost_name_to_protocol(
wsi->vhost, hit->protocol);
if (lws_bind_protocol(wsi, pp))
return 1;
n = pp->callback(wsi, LWS_CALLBACK_HTTP,
wsi->user_space,
uri_ptr + hit->mountpoint_len,
uri_len - hit->mountpoint_len);
} else
n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
wsi->user_space, uri_ptr, uri_len);
}
after:
if (n) {
lwsl_info("LWS_CALLBACK_HTTP closing\n");
return 1;
}
#ifdef LWS_WITH_CGI
deal_body:
#endif
/*
* If we're not issuing a file, check for content_length or
* HTTP keep-alive. No keep-alive header allocation for
* ISSUING_FILE, as this uses HTTP/1.0.
*
* In any case, return 0 and let lws_read decide how to
* proceed based on state
*/
if (wsi->state != LWSS_HTTP_ISSUING_FILE) {
/* Prepare to read body if we have a content length: */
lwsl_debug("wsi->u.http.rx_content_length %lld %d %d\n",
(long long)wsi->u.http.rx_content_length,
wsi->upgraded_to_http2, wsi->http2_substream);
if (wsi->u.http.rx_content_length > 0) {
lwsl_notice("%s: %p: LWSS_HTTP_BODY state set\n",
__func__, wsi);
wsi->state = LWSS_HTTP_BODY;
wsi->u.http.rx_content_remain =
wsi->u.http.rx_content_length;
}
}
return 0;
bail_nuke_ah:
/* we're closing, losing some rx is OK */
lws_header_table_force_to_detachable_state(wsi);
lws_header_table_detach(wsi, 1);
return 1;
#if LWS_POSIX
transaction_result_n:
lws_return_http_status(wsi, n, NULL);
return lws_http_transaction_completed(wsi);
#endif
}
static int
lws_server_init_wsi_for_ws(struct lws *wsi)
{
int n;
wsi->state = LWSS_ESTABLISHED;
lws_restart_ws_ping_pong_timer(wsi);
/*
* create the frame buffer for this connection according to the
* size mentioned in the protocol definition. If 0 there, use
* a big default for compatibility
*/
n = wsi->protocol->rx_buffer_size;
if (!n)
n = wsi->context->pt_serv_buf_size;
n += LWS_PRE;
wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */, "rx_ubuf");
if (!wsi->u.ws.rx_ubuf) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
return 1;
}
wsi->u.ws.rx_ubuf_alloc = n;
lwsl_debug("Allocating RX buffer %d\n", n);
#if LWS_POSIX && !defined(LWS_WITH_ESP32)
if (!wsi->parent_carries_io)
if (setsockopt(wsi->desc.sockfd, SOL_SOCKET, SO_SNDBUF,
(const char *)&n, sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
return 1;
}
#endif
/* notify user code that we're ready to roll */
if (wsi->protocol->callback)
if (wsi->protocol->callback(wsi, LWS_CALLBACK_ESTABLISHED,
wsi->user_space,
#ifdef LWS_OPENSSL_SUPPORT
wsi->ssl,
#else
NULL,
#endif
0))
return 1;
return 0;
}
int
lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
{
int protocol_len, n = 0, hit, non_space_char_found = 0, m;
struct lws_context *context = lws_get_context(wsi);
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
struct _lws_header_related hdr;
struct allocated_headers *ah;
unsigned char *obuf = *buf;
char protocol_list[128];
char protocol_name[64];
size_t olen = len;
char *p;
if (len >= 10000000) {
lwsl_err("%s: assert: len %ld\n", __func__, (long)len);
assert(0);
}
if (!wsi->u.hdr.ah) {
lwsl_err("%s: assert: NULL ah\n", __func__);
assert(0);
}
lwsl_hexdump(*buf, len);
while (len--) {
wsi->more_rx_waiting = !!len;
if (wsi->mode != LWSCM_HTTP_SERVING &&
wsi->mode != LWSCM_HTTP2_SERVING &&
wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED) {
lwsl_err("%s: bad wsi mode %d\n", __func__, wsi->mode);
goto bail_nuke_ah;
}
m = lws_parse(wsi, *(*buf)++);
if (m) {
if (m == 2) {
/*
* we are transitioning from http with
* an AH, to raw. Drop the ah and set
* the mode.
*/
raw_transition:
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
lws_bind_protocol(wsi, &wsi->vhost->protocols[
wsi->vhost->
raw_protocol_index]);
lwsl_info("transition to raw vh %s prot %d\n",
wsi->vhost->name,
wsi->vhost->raw_protocol_index);
if ((wsi->protocol->callback)(wsi,
LWS_CALLBACK_RAW_ADOPT,
wsi->user_space, NULL, 0))
goto bail_nuke_ah;
lws_header_table_force_to_detachable_state(wsi);
lws_union_transition(wsi, LWSCM_RAW);
lws_header_table_detach(wsi, 1);
if (m == 2 && (wsi->protocol->callback)(wsi,
LWS_CALLBACK_RAW_RX,
wsi->user_space, obuf, olen))
return 1;
return 0;
}
lwsl_info("lws_parse failed\n");
goto bail_nuke_ah;
}
if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
continue;
lwsl_parser("%s: lws_parse sees parsing complete\n", __func__);
lwsl_debug("%s: wsi->more_rx_waiting=%d\n", __func__,
wsi->more_rx_waiting);
/* select vhost */
if (lws_hdr_total_length(wsi, WSI_TOKEN_HOST)) {
struct lws_vhost *vhost = lws_select_vhost(
context, wsi->vhost->listen_port,
lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
if (vhost)
wsi->vhost = vhost;
} else
lwsl_info("no host\n");
if (wsi->mode != LWSCM_HTTP2_SERVING) {
wsi->vhost->conn_stats.h1_trans++;
if (!wsi->conn_stat_done) {
wsi->vhost->conn_stats.h1_conn++;
wsi->conn_stat_done = 1;
}
}
/* check for unwelcome guests */
if (wsi->context->reject_service_keywords) {
const struct lws_protocol_vhost_options *rej =
wsi->context->reject_service_keywords;
char ua[384], *msg = NULL;
if (lws_hdr_copy(wsi, ua, sizeof(ua) - 1,
WSI_TOKEN_HTTP_USER_AGENT) > 0) {
ua[sizeof(ua) - 1] = '\0';
while (rej) {
if (strstr(ua, rej->name)) {
#ifdef LWS_WITH_ACCESS_LOG
char *uri_ptr = NULL;
int meth, uri_len;
#endif
msg = strchr(rej->value, ' ');
if (msg)
msg++;
lws_return_http_status(wsi,
atoi(rej->value), msg);
#ifdef LWS_WITH_ACCESS_LOG
meth = lws_http_get_uri_and_method(wsi,
&uri_ptr, &uri_len);
if (meth >= 0)
lws_prepare_access_log_info(wsi,
uri_ptr, meth);
/* wsi close will do the log */
#endif
wsi->vhost->conn_stats.rejected++;
/*
* We don't want anything from
* this rejected guy. Follow
* the close flow, not the
* transaction complete flow.
*/
goto bail_nuke_ah;
}
rej = rej->next;
}
}
}
if (lws_hdr_total_length(wsi, WSI_TOKEN_CONNECT)) {
lwsl_info("Changing to RAW mode\n");
m = 0;
goto raw_transition;
}
wsi->mode = LWSCM_PRE_WS_SERVING_ACCEPT;
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
/* is this websocket protocol or normal http 1.0? */
if (lws_hdr_total_length(wsi, WSI_TOKEN_UPGRADE)) {
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"websocket")) {
wsi->vhost->conn_stats.ws_upg++;
lwsl_info("Upgrade to ws\n");
goto upgrade_ws;
}
#ifdef LWS_WITH_HTTP2
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"h2c")) {
wsi->vhost->conn_stats.h2_upg++;
lwsl_info("Upgrade to h2c\n");
goto upgrade_h2c;
}
#endif
lwsl_info("Unknown upgrade\n");
/* dunno what he wanted to upgrade to */
goto bail_nuke_ah;
}
/* no upgrade ack... he remained as HTTP */
lwsl_info("No upgrade\n");
ah = wsi->u.hdr.ah;
lws_union_transition(wsi, LWSCM_HTTP_SERVING_ACCEPTED);
wsi->state = LWSS_HTTP;
wsi->u.http.fop_fd = NULL;
/* expose it at the same offset as u.hdr */
wsi->u.http.ah = ah;
lwsl_debug("%s: wsi %p: ah %p\n", __func__, (void *)wsi,
(void *)wsi->u.hdr.ah);
n = lws_http_action(wsi);
return n;
#ifdef LWS_WITH_HTTP2
upgrade_h2c:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
lwsl_info("missing http2_settings\n");
goto bail_nuke_ah;
}
lwsl_info("h2c upgrade...\n");
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP2_SETTINGS);
/* convert the peer's HTTP-Settings */
n = lws_b64_decode_string(p, protocol_list,
sizeof(protocol_list));
if (n < 0) {
lwsl_parser("HTTP2_SETTINGS too long\n");
return 1;
}
/* adopt the header info */
ah = wsi->u.hdr.ah;
lws_union_transition(wsi, LWSCM_HTTP2_SERVING);
/* http2 union member has http union struct at start */
wsi->u.http.ah = ah;
if (!wsi->u.h2.h2n) {
wsi->u.h2.h2n = lws_zalloc(sizeof(*wsi->u.h2.h2n), "h2n");
if (!wsi->u.h2.h2n)
return 1;
}
lws_h2_init(wsi);
/* HTTP2 union */
lws_h2_settings(wsi, &wsi->u.h2.h2n->set,
(unsigned char *)protocol_list, n);
lws_hpack_dynamic_size(wsi, wsi->u.h2.h2n->set.s[
H2SET_HEADER_TABLE_SIZE]);
strcpy(protocol_list, "HTTP/1.1 101 Switching Protocols\x0d\x0a"
"Connection: Upgrade\x0d\x0a"
"Upgrade: h2c\x0d\x0a\x0d\x0a");
n = lws_issue_raw(wsi, (unsigned char *)protocol_list,
strlen(protocol_list));
if (n != strlen(protocol_list)) {
lwsl_debug("http2 switch: ERROR writing to socket\n");
return 1;
}
wsi->state = LWSS_HTTP2_AWAIT_CLIENT_PREFACE;
return 0;
#endif
upgrade_ws:
if (!wsi->protocol)
lwsl_err("NULL protocol at lws_read\n");
/*
* It's websocket
*
* Select the first protocol we support from the list
* the client sent us.
*
* Copy it to remove header fragmentation
*/
if (lws_hdr_copy(wsi, protocol_list, sizeof(protocol_list) - 1,
WSI_TOKEN_PROTOCOL) < 0) {
lwsl_err("protocol list too long");
goto bail_nuke_ah;
}
protocol_len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
protocol_list[protocol_len] = '\0';
p = protocol_list;
hit = 0;
while (*p && !hit) {
n = 0;
non_space_char_found = 0;
while (n < sizeof(protocol_name) - 1 &&
*p && *p != ',') {
/* ignore leading spaces */
if (!non_space_char_found && *p == ' ') {
n++;
continue;
}
non_space_char_found = 1;
protocol_name[n++] = *p++;
}
protocol_name[n] = '\0';
if (*p)
p++;
lwsl_info("checking %s\n", protocol_name);
n = 0;
while (wsi->vhost->protocols[n].callback) {
lwsl_info("try %s\n",
wsi->vhost->protocols[n].name);
if (wsi->vhost->protocols[n].name &&
!strcmp(wsi->vhost->protocols[n].name,
protocol_name)) {
wsi->protocol = &wsi->vhost->protocols[n];
hit = 1;
break;
}
n++;
}
}
/* we didn't find a protocol he wanted? */
if (!hit) {
if (lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL)) {
lwsl_info("No protocol from \"%s\" supported\n",
protocol_list);
goto bail_nuke_ah;
}
/*
* some clients only have one protocol and
* do not send the protocol list header...
* allow it and match to the vhost's default
* protocol (which itself defaults to zero)
*/
lwsl_info("defaulting to prot handler %d\n",
wsi->vhost->default_protocol_index);
n = wsi->vhost->default_protocol_index;
wsi->protocol = &wsi->vhost->protocols[
(int)wsi->vhost->default_protocol_index];
}
/* allocate wsi->user storage */
if (lws_ensure_user_space(wsi))
goto bail_nuke_ah;
/*
* Give the user code a chance to study the request and
* have the opportunity to deny it
*/
if ((wsi->protocol->callback)(wsi,
LWS_CALLBACK_FILTER_PROTOCOL_CONNECTION,
wsi->user_space,
lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL), 0)) {
lwsl_warn("User code denied connection\n");
goto bail_nuke_ah;
}
/*
* Perform the handshake according to the protocol version the
* client announced
*/
switch (wsi->ietf_spec_revision) {
case 13:
lwsl_parser("lws_parse calling handshake_04\n");
if (handshake_0405(context, wsi)) {
lwsl_info("hs0405 has failed the connection\n");
goto bail_nuke_ah;
}
break;
default:
lwsl_info("Unknown client spec version %d\n",
wsi->ietf_spec_revision);
goto bail_nuke_ah;
}
lws_same_vh_protocol_insert(wsi, n);
/* we are upgrading to ws, so http/1.1 and keepalive +
* pipelined header considerations about keeping the ah around
* no longer apply. However it's common for the first ws
* protocol data to have been coalesced with the browser
* upgrade request and to already be in the ah rx buffer.
*/
lwsl_info("%s: %p: inheriting ws ah (rxpos:%d, rxlen:%d)\n",
__func__, wsi, wsi->u.hdr.ah->rxpos,
wsi->u.hdr.ah->rxlen);
lws_pt_lock(pt);
hdr = wsi->u.hdr;
lws_union_transition(wsi, LWSCM_WS_SERVING);
/*
* first service is WS mode will notice this, use the RX and
* then detach the ah (caution: we are not in u.hdr union
* mode any more then... ah_temp member is at start the same
* though)
*
* Because rxpos/rxlen shows something in the ah, we will get
* service guaranteed next time around the event loop
*
* All union members begin with hdr, so we can use it even
* though we transitioned to ws union mode (the ah detach
* code uses it anyway).
*/
wsi->u.hdr = hdr;
lws_pt_unlock(pt);
lws_server_init_wsi_for_ws(wsi);
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
/* !!! drop ah unreservedly after ESTABLISHED */
if (!wsi->more_rx_waiting) {
lws_header_table_force_to_detachable_state(wsi);
lws_header_table_detach(wsi, 1);
}
return 0;
} /* while all chars are handled */
return 0;
bail_nuke_ah:
/* drop the header info */
/* we're closing, losing some rx is OK */
lws_header_table_force_to_detachable_state(wsi);
lws_header_table_detach(wsi, 1);
return 1;
}
static int
lws_get_idlest_tsi(struct lws_context *context)
{
unsigned int lowest = ~0;
int n = 0, hit = -1;
for (; n < context->count_threads; n++) {
if ((unsigned int)context->pt[n].fds_count !=
context->fd_limit_per_thread - 1 &&
(unsigned int)context->pt[n].fds_count < lowest) {
lowest = context->pt[n].fds_count;
hit = n;
}
}
return hit;
}
struct lws *
lws_create_new_server_wsi(struct lws_vhost *vhost)
{
struct lws *new_wsi;
int n = lws_get_idlest_tsi(vhost->context);
if (n < 0) {
lwsl_err("no space for new conn\n");
return NULL;
}
new_wsi = lws_zalloc(sizeof(struct lws), "new server wsi");
if (new_wsi == NULL) {
lwsl_err("Out of memory for new connection\n");
return NULL;
}
new_wsi->tsi = n;
lwsl_debug("new wsi %p joining vhost %s, tsi %d\n", new_wsi,
vhost->name, new_wsi->tsi);
new_wsi->vhost = vhost;
new_wsi->context = vhost->context;
new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/* initialize the instance struct */
new_wsi->state = LWSS_HTTP;
new_wsi->mode = LWSCM_HTTP_SERVING;
new_wsi->hdr_parsing_completed = 0;
#ifdef LWS_OPENSSL_SUPPORT
new_wsi->use_ssl = LWS_SSL_ENABLED(vhost);
#endif
/*
* these can only be set once the protocol is known
* we set an un-established connection's protocol pointer
* to the start of the supported list, so it can look
* for matching ones during the handshake
*/
new_wsi->protocol = vhost->protocols;
new_wsi->user_space = NULL;
new_wsi->ietf_spec_revision = 0;
new_wsi->desc.sockfd = LWS_SOCK_INVALID;
new_wsi->position_in_fds_table = -1;
vhost->context->count_wsi_allocated++;
/*
* outermost create notification for wsi
* no user_space because no protocol selection
*/
vhost->protocols[0].callback(new_wsi, LWS_CALLBACK_WSI_CREATE,
NULL, NULL, 0);
return new_wsi;
}
LWS_VISIBLE int LWS_WARN_UNUSED_RESULT
lws_http_transaction_completed(struct lws *wsi)
{
int n = NO_PENDING_TIMEOUT;
lwsl_info("%s: wsi %p\n", __func__, wsi);
lws_access_log(wsi);
if (!wsi->hdr_parsing_completed) {
lwsl_notice("%s: ignoring, ah parsing incomplete\n", __func__);
return 0;
}
lwsl_debug("%s: wsi %p\n", __func__, wsi);
/* if we can't go back to accept new headers, drop the connection */
if (wsi->http2_substream)
return 0;
if (wsi->seen_zero_length_recv)
return 1;
if (wsi->u.http.connection_type != HTTP_CONNECTION_KEEP_ALIVE) {
lwsl_info("%s: %p: close connection\n", __func__, wsi);
return 1;
}
if (lws_bind_protocol(wsi, &wsi->vhost->protocols[0]))
return 1;
/* otherwise set ourselves up ready to go again */
wsi->state = LWSS_HTTP;
wsi->mode = LWSCM_HTTP_SERVING;
wsi->u.http.tx_content_length = 0;
wsi->u.http.tx_content_remain = 0;
wsi->hdr_parsing_completed = 0;
#ifdef LWS_WITH_ACCESS_LOG
wsi->access_log.sent = 0;
#endif
if (wsi->vhost->keepalive_timeout)
n = PENDING_TIMEOUT_HTTP_KEEPALIVE_IDLE;
lws_set_timeout(wsi, n, wsi->vhost->keepalive_timeout);
/*
* We already know we are on http1.1 / keepalive and the next thing
* coming will be another header set.
*
* If there is no pending rx and we still have the ah, drop it and
* reacquire a new ah when the new headers start to arrive. (Otherwise
* we needlessly hog an ah indefinitely.)
*
* However if there is pending rx and we know from the keepalive state
* that is already at least the start of another header set, simply
* reset the existing header table and keep it.
*/
if (wsi->u.hdr.ah) {
lwsl_debug("%s: wsi->more_rx_waiting=%d\n", __func__,
wsi->more_rx_waiting);
if (!wsi->more_rx_waiting) {
lws_header_table_force_to_detachable_state(wsi);
lws_header_table_detach(wsi, 1);
#ifdef LWS_OPENSSL_SUPPORT
/*
* additionally... if we are hogging an SSL instance
* with no pending pipelined headers (or ah now), and
* SSL is scarce, drop this connection without waiting
*/
if (wsi->vhost->use_ssl &&
wsi->context->simultaneous_ssl_restriction &&
wsi->context->simultaneous_ssl ==
wsi->context->simultaneous_ssl_restriction) {
lwsl_info("%s: simultaneous_ssl_restriction\n",
__func__);
return 1;
}
#endif
} else {
lws_header_table_reset(wsi, 1);
/*
* If we kept the ah, we should restrict the amount
* of time we are willing to keep it. Otherwise it
* will be bound the whole time the connection remains
* open.
*/
lws_set_timeout(wsi, PENDING_TIMEOUT_HOLDING_AH,
wsi->vhost->keepalive_timeout);
}
}
/* If we're (re)starting on headers, need other implied init */
wsi->u.hdr.ues = URIES_IDLE;
lwsl_info("%s: %p: keep-alive await new transaction\n", __func__, wsi);
return 0;
}
/* if not a socket, it's a raw, non-ssl file descriptor */
LWS_VISIBLE struct lws *
lws_adopt_descriptor_vhost(struct lws_vhost *vh, lws_adoption_type type,
lws_sock_file_fd_type fd, const char *vh_prot_name,
struct lws *parent)
{
struct lws_context *context = vh->context;
struct lws *new_wsi;
struct lws_context_per_thread *pt;
int n, ssl = 0;
#if defined(LWS_WITH_PEER_LIMITS)
struct lws_peer *peer = NULL;
if (type & LWS_ADOPT_SOCKET && !(type & LWS_ADOPT_WS_PARENTIO)) {
peer = lws_get_or_create_peer(vh, fd.sockfd);
if (!peer) {
lwsl_err("OOM creating peer\n");
return NULL;
}
if (context->ip_limit_wsi &&
peer->count_wsi >= context->ip_limit_wsi) {
lwsl_notice("Peer reached wsi limit %d\n",
context->ip_limit_wsi);
lws_stats_atomic_bump(context, &context->pt[0],
LWSSTATS_C_PEER_LIMIT_WSI_DENIED, 1);
return NULL;
}
}
#endif
new_wsi = lws_create_new_server_wsi(vh);
if (!new_wsi) {
if (type & LWS_ADOPT_SOCKET && !(type & LWS_ADOPT_WS_PARENTIO))
compatible_close(fd.sockfd);
return NULL;
}
#if defined(LWS_WITH_PEER_LIMITS)
if (peer)
lws_peer_add_wsi(context, peer, new_wsi);
#endif
pt = &context->pt[(int)new_wsi->tsi];
lws_stats_atomic_bump(context, pt, LWSSTATS_C_CONNECTIONS, 1);
if (parent) {
new_wsi->parent = parent;
new_wsi->sibling_list = parent->child_list;
parent->child_list = new_wsi;
if (type & LWS_ADOPT_WS_PARENTIO)
new_wsi->parent_carries_io = 1;
}
new_wsi->desc = fd;
if (vh_prot_name) {
new_wsi->protocol = lws_vhost_name_to_protocol(new_wsi->vhost,
vh_prot_name);
if (!new_wsi->protocol) {
lwsl_err("Protocol %s not enabled on vhost %s\n",
vh_prot_name, new_wsi->vhost->name);
goto bail;
}
if (lws_ensure_user_space(new_wsi)) {
lwsl_notice("OOM trying to get user_space\n");
goto bail;
}
if (type & LWS_ADOPT_WS_PARENTIO) {
new_wsi->desc.sockfd = LWS_SOCK_INVALID;
lwsl_debug("binding to %s\n", new_wsi->protocol->name);
lws_bind_protocol(new_wsi, new_wsi->protocol);
lws_union_transition(new_wsi, LWSCM_WS_SERVING);
lws_server_init_wsi_for_ws(new_wsi);
return new_wsi;
}
} else
if (type & LWS_ADOPT_HTTP) /* he will transition later */
new_wsi->protocol =
&vh->protocols[vh->default_protocol_index];
else { /* this is the only time he will transition */
lws_bind_protocol(new_wsi,
&vh->protocols[vh->raw_protocol_index]);
lws_union_transition(new_wsi, LWSCM_RAW);
}
if (type & LWS_ADOPT_SOCKET) { /* socket desc */
lwsl_debug("%s: new wsi %p, sockfd %d\n", __func__, new_wsi,
(int)(lws_intptr_t)fd.sockfd);
if (type & LWS_ADOPT_HTTP)
/* the transport is accepted...
* give him time to negotiate */
lws_set_timeout(new_wsi,
PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
context->timeout_secs);
#if LWS_POSIX == 0
#if defined(LWS_WITH_ESP8266)
esp8266_tcp_stream_accept(accept_fd, new_wsi);
#endif
#endif
} else /* file desc */
lwsl_debug("%s: new wsi %p, filefd %d\n", __func__, new_wsi,
(int)(lws_intptr_t)fd.filefd);
/*
* A new connection was accepted. Give the user a chance to
* set properties of the newly created wsi. There's no protocol
* selected yet so we issue this to the vhosts's default protocol,
* itself by default protocols[0]
*/
n = LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED;
if (!(type & LWS_ADOPT_HTTP)) {
if (!(type & LWS_ADOPT_SOCKET))
n = LWS_CALLBACK_RAW_ADOPT_FILE;
else
n = LWS_CALLBACK_RAW_ADOPT;
}
if (!LWS_SSL_ENABLED(new_wsi->vhost) || !(type & LWS_ADOPT_ALLOW_SSL) ||
!(type & LWS_ADOPT_SOCKET)) {
/* non-SSL */
if (!(type & LWS_ADOPT_HTTP)) {
if (!(type & LWS_ADOPT_SOCKET))
new_wsi->mode = LWSCM_RAW_FILEDESC;
else
new_wsi->mode = LWSCM_RAW;
}
} else {
/* SSL */
if (!(type & LWS_ADOPT_HTTP))
new_wsi->mode = LWSCM_SSL_INIT_RAW;
else
new_wsi->mode = LWSCM_SSL_INIT;
ssl = 1;
}
lws_libev_accept(new_wsi, new_wsi->desc);
lws_libuv_accept(new_wsi, new_wsi->desc);
lws_libevent_accept(new_wsi, new_wsi->desc);
if (!ssl) {
if (insert_wsi_socket_into_fds(context, new_wsi)) {
lwsl_err("%s: fail inserting socket\n", __func__);
goto fail;
}
} else
if (lws_server_socket_service_ssl(new_wsi, fd.sockfd)) {
lwsl_info("%s: fail ssl negotiation\n", __func__);
goto fail;
}
/*
* by deferring callback to this point, after insertion to fds,
* lws_callback_on_writable() can work from the callback
*/
if ((new_wsi->protocol->callback)(
new_wsi, n, new_wsi->user_space, NULL, 0))
goto fail;
if (type & LWS_ADOPT_HTTP) {
if (!lws_header_table_attach(new_wsi, 0))
lwsl_debug("Attached ah immediately\n");
else
lwsl_info("%s: waiting for ah\n", __func__);
}
return new_wsi;
fail:
if (type & LWS_ADOPT_SOCKET)
lws_close_free_wsi(new_wsi, LWS_CLOSE_STATUS_NOSTATUS);
return NULL;
bail:
lwsl_notice("%s: exiting on bail\n", __func__);
if (parent)
parent->child_list = new_wsi->sibling_list;
if (new_wsi->user_space)
lws_free(new_wsi->user_space);
lws_free(new_wsi);
compatible_close(fd.sockfd);
return NULL;
}
LWS_VISIBLE struct lws *
lws_adopt_socket_vhost(struct lws_vhost *vh, lws_sockfd_type accept_fd)
{
lws_sock_file_fd_type fd;
fd.sockfd = accept_fd;
return lws_adopt_descriptor_vhost(vh, LWS_ADOPT_SOCKET |
LWS_ADOPT_HTTP | LWS_ADOPT_ALLOW_SSL, fd, NULL, NULL);
}
LWS_VISIBLE struct lws *
lws_adopt_socket(struct lws_context *context, lws_sockfd_type accept_fd)
{
return lws_adopt_socket_vhost(context->vhost_list, accept_fd);
}
/* Common read-buffer adoption for lws_adopt_*_readbuf */
static struct lws*
adopt_socket_readbuf(struct lws *wsi, const char *readbuf, size_t len)
{
struct lws_context_per_thread *pt;
struct allocated_headers *ah;
struct lws_pollfd *pfd;
if (!wsi)
return NULL;
if (!readbuf || len == 0)
return wsi;
if (len > sizeof(ah->rx)) {
lwsl_err("%s: rx in too big\n", __func__);
goto bail;
}
/*
* we can't process the initial read data until we can attach an ah.
*
* if one is available, get it and place the data in his ah rxbuf...
* wsi with ah that have pending rxbuf get auto-POLLIN service.
*
* no autoservice because we didn't get a chance to attach the
* readbuf data to wsi or ah yet, and we will do it next if we get
* the ah.
*/
if (wsi->u.hdr.ah || !lws_header_table_attach(wsi, 0)) {
ah = wsi->u.hdr.ah;
memcpy(ah->rx, readbuf, len);
ah->rxpos = 0;
ah->rxlen = (int16_t)len;
lwsl_notice("%s: calling service on readbuf ah\n", __func__);
pt = &wsi->context->pt[(int)wsi->tsi];
/* unlike a normal connect, we have the headers already
* (or the first part of them anyway).
* libuv won't come back and service us without a network
* event, so we need to do the header service right here.
*/
pfd = &pt->fds[wsi->position_in_fds_table];
pfd->revents |= LWS_POLLIN;
lwsl_err("%s: calling service\n", __func__);
if (lws_service_fd_tsi(wsi->context, pfd, wsi->tsi))
/* service closed us */
return NULL;
return wsi;
}
lwsl_err("%s: deferring handling ah\n", __func__);
/*
* hum if no ah came, we are on the wait list and must defer
* dealing with this until the ah arrives.
*
* later successful lws_header_table_attach() will apply the
* below to the rx buffer (via lws_header_table_reset()).
*/
wsi->u.hdr.preamble_rx = lws_malloc(len, "preamble_rx");
if (!wsi->u.hdr.preamble_rx) {
lwsl_err("OOM\n");
goto bail;
}
memcpy(wsi->u.hdr.preamble_rx, readbuf, len);
wsi->u.hdr.preamble_rx_len = len;
return wsi;
bail:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return NULL;
}
LWS_VISIBLE struct lws *
lws_adopt_socket_readbuf(struct lws_context *context, lws_sockfd_type accept_fd,
const char *readbuf, size_t len)
{
return adopt_socket_readbuf(lws_adopt_socket(context, accept_fd),
readbuf, len);
}
LWS_VISIBLE struct lws *
lws_adopt_socket_vhost_readbuf(struct lws_vhost *vhost,
lws_sockfd_type accept_fd,
const char *readbuf, size_t len)
{
return adopt_socket_readbuf(lws_adopt_socket_vhost(vhost, accept_fd),
readbuf, len);
}
LWS_VISIBLE int
lws_server_socket_service(struct lws_context *context, struct lws *wsi,
struct lws_pollfd *pollfd)
{
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
lws_sockfd_type accept_fd = LWS_SOCK_INVALID;
struct allocated_headers *ah;
lws_sock_file_fd_type fd;
int opts = LWS_ADOPT_SOCKET | LWS_ADOPT_ALLOW_SSL;
#if LWS_POSIX
struct sockaddr_storage cli_addr;
socklen_t clilen;
#endif
int n, len;
switch (wsi->mode) {
case LWSCM_HTTP_SERVING:
case LWSCM_HTTP_SERVING_ACCEPTED:
case LWSCM_HTTP2_SERVING:
case LWSCM_RAW:
/* handle http headers coming in */
/* pending truncated sends have uber priority */
if (wsi->trunc_len) {
if (!(pollfd->revents & LWS_POLLOUT))
break;
if (lws_issue_raw(wsi, wsi->trunc_alloc +
wsi->trunc_offset,
wsi->trunc_len) < 0)
goto fail;
/*
* we can't afford to allow input processing to send
* something new, so spin around he event loop until
* he doesn't have any partials
*/
break;
}
/* any incoming data ready? */
if (!(pollfd->revents & pollfd->events & LWS_POLLIN))
goto try_pollout;
/*
* If we previously just did POLLIN when IN and OUT were
* signalled (because POLLIN processing may have used up
* the POLLOUT), don't let that happen twice in a row...
* next time we see the situation favour POLLOUT
*/
#if !defined(LWS_WITH_ESP8266)
if (wsi->favoured_pollin &&
(pollfd->revents & pollfd->events & LWS_POLLOUT)) {
lwsl_notice("favouring pollout\n");
wsi->favoured_pollin = 0;
goto try_pollout;
}
#endif
/* these states imply we MUST have an ah attached */
if (wsi->mode != LWSCM_RAW && (wsi->state == LWSS_HTTP ||
wsi->state == LWSS_HTTP_ISSUING_FILE ||
wsi->state == LWSS_HTTP_HEADERS)) {
if (!wsi->u.hdr.ah) {
/* no autoservice beacuse we will do it next */
if (lws_header_table_attach(wsi, 0)) {
lwsl_info("wsi %p: ah get fail\n", wsi);
goto try_pollout;
}
}
ah = wsi->u.hdr.ah;
/* if nothing in ah rx buffer, get some fresh rx */
if (ah->rxpos == ah->rxlen) {
ah->rxlen = lws_ssl_capable_read(wsi, ah->rx,
sizeof(ah->rx));
ah->rxpos = 0;
switch (ah->rxlen) {
case 0:
lwsl_info("%s: read 0 len a\n", __func__);
wsi->seen_zero_length_recv = 1;
lws_change_pollfd(wsi, LWS_POLLIN, 0);
goto try_pollout;
/* fallthru */
case LWS_SSL_CAPABLE_ERROR:
goto fail;
case LWS_SSL_CAPABLE_MORE_SERVICE:
ah->rxlen = ah->rxpos = 0;
goto try_pollout;
}
/*
* make sure ah does not get detached if we
* have live data in the rx
*/
if (ah->rxlen)
wsi->more_rx_waiting = 1;
}
if (!(ah->rxpos != ah->rxlen && ah->rxlen)) {
lwsl_err("%s: assert: rxpos %d, rxlen %d\n",
__func__, ah->rxpos, ah->rxlen);
assert(0);
}
/* just ignore incoming if waiting for close */
if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
wsi->state != LWSS_HTTP_ISSUING_FILE) {
/*
* otherwise give it to whoever wants it
* according to the connection state
*/
n = lws_read(wsi, ah->rx + ah->rxpos,
ah->rxlen - ah->rxpos);
if (n < 0) /* we closed wsi */
return 1;
if (!wsi->u.hdr.ah)
break;
if ( wsi->u.hdr.ah->rxlen)
wsi->u.hdr.ah->rxpos += n;
lwsl_debug("%s: wsi %p: ah read rxpos %d, rxlen %d\n",
__func__, wsi, wsi->u.hdr.ah->rxpos,
wsi->u.hdr.ah->rxlen);
if (lws_header_table_is_in_detachable_state(wsi) &&
(wsi->mode != LWSCM_HTTP_SERVING &&
wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED &&
wsi->mode != LWSCM_HTTP2_SERVING))
lws_header_table_detach(wsi, 1);
break;
}
goto try_pollout;
}
len = lws_ssl_capable_read(wsi, pt->serv_buf,
context->pt_serv_buf_size);
lwsl_debug("%s: wsi %p read %d\r\n", __func__, wsi, len);
switch (len) {
case 0:
lwsl_info("%s: read 0 len b\n", __func__);
/* fallthru */
case LWS_SSL_CAPABLE_ERROR:
goto fail;
case LWS_SSL_CAPABLE_MORE_SERVICE:
goto try_pollout;
}
if (len < 0) /* coverity */
goto fail;
if (wsi->mode == LWSCM_RAW) {
n = user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_RAW_RX,
wsi->user_space, pt->serv_buf, len);
if (n < 0) {
lwsl_info("LWS_CALLBACK_RAW_RX_fail\n");
goto fail;
}
goto try_pollout;
}
/* just ignore incoming if waiting for close */
if (wsi->state != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE &&
wsi->state != LWSS_HTTP_ISSUING_FILE) {
/*
* this may want to send
* (via HTTP callback for example)
*/
n = lws_read(wsi, pt->serv_buf, len);
if (n < 0) /* we closed wsi */
return 1;
/*
* he may have used up the
* writability above, if we will defer POLLOUT
* processing in favour of POLLIN, note it
*/
if (pollfd->revents & LWS_POLLOUT)
wsi->favoured_pollin = 1;
break;
}
/*
* he may have used up the
* writability above, if we will defer POLLOUT
* processing in favour of POLLIN, note it
*/
if (pollfd->revents & LWS_POLLOUT)
wsi->favoured_pollin = 1;
try_pollout:
/* this handles POLLOUT for http serving fragments */
if (!(pollfd->revents & LWS_POLLOUT))
break;
/* one shot */
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_notice("%s a\n", __func__);
goto fail;
}
if (wsi->mode == LWSCM_RAW) {
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_C_WRITEABLE_CB, 1);
#if defined(LWS_WITH_STATS)
if (wsi->active_writable_req_us) {
uint64_t ul = time_in_microseconds() -
wsi->active_writable_req_us;
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_MS_WRITABLE_DELAY, ul);
lws_stats_atomic_max(wsi->context, pt,
LWSSTATS_MS_WORST_WRITABLE_DELAY, ul);
wsi->active_writable_req_us = 0;
}
#endif
n = user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_RAW_WRITEABLE,
wsi->user_space, NULL, 0);
if (n < 0) {
lwsl_info("writeable_fail\n");
goto fail;
}
break;
}
if (!wsi->hdr_parsing_completed)
break;
if (wsi->state != LWSS_HTTP_ISSUING_FILE) {
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_C_WRITEABLE_CB, 1);
#if defined(LWS_WITH_STATS)
if (wsi->active_writable_req_us) {
uint64_t ul = time_in_microseconds() -
wsi->active_writable_req_us;
lws_stats_atomic_bump(wsi->context, pt,
LWSSTATS_MS_WRITABLE_DELAY, ul);
lws_stats_atomic_max(wsi->context, pt,
LWSSTATS_MS_WORST_WRITABLE_DELAY, ul);
wsi->active_writable_req_us = 0;
}
#endif
n = user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_HTTP_WRITEABLE,
wsi->user_space, NULL, 0);
if (n < 0) {
lwsl_info("writeable_fail\n");
goto fail;
}
break;
}
/* >0 == completion, <0 == error
*
* We'll get a LWS_CALLBACK_HTTP_FILE_COMPLETION callback when
* it's done. That's the case even if we just completed the
* send, so wait for that.
*/
n = lws_serve_http_file_fragment(wsi);
if (n < 0)
goto fail;
break;
case LWSCM_SERVER_LISTENER:
#if LWS_POSIX
/* pollin means a client has connected to us then */
do {
if (!(pollfd->revents & LWS_POLLIN) ||
!(pollfd->events & LWS_POLLIN))
break;
#ifdef LWS_OPENSSL_SUPPORT
/*
* can we really accept it, with regards to SSL limit?
* another vhost may also have had POLLIN on his listener this
* round and used it up already
*/
if (wsi->vhost->use_ssl &&
context->simultaneous_ssl_restriction &&
context->simultaneous_ssl ==
context->simultaneous_ssl_restriction)
/* no... ignore it, he won't come again until we are
* below the simultaneous_ssl_restriction limit and
* POLLIN is enabled on him again
*/
break;
#endif
/* listen socket got an unencrypted connection... */
clilen = sizeof(cli_addr);
lws_latency_pre(context, wsi);
/*
* We cannot identify the peer who is in the listen
* socket connect queue before we accept it; even if
* we could, not accepting it due to PEER_LIMITS would
* block the connect queue for other legit peers.
*/
accept_fd = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
&clilen);
lws_latency(context, wsi, "listener accept", accept_fd,
accept_fd >= 0);
if (accept_fd < 0) {
if (LWS_ERRNO == LWS_EAGAIN ||
LWS_ERRNO == LWS_EWOULDBLOCK) {
break;
}
lwsl_err("ERROR on accept: %s\n", strerror(LWS_ERRNO));
break;
}
lws_plat_set_socket_options(wsi->vhost, accept_fd);
#if defined(LWS_WITH_IPV6)
lwsl_debug("accepted new conn port %u on fd=%d\n",
((cli_addr.ss_family == AF_INET6) ?
ntohs(((struct sockaddr_in6 *) &cli_addr)->sin6_port) :
ntohs(((struct sockaddr_in *) &cli_addr)->sin_port)),
accept_fd);
#else
lwsl_debug("accepted new conn port %u on fd=%d\n",
ntohs(((struct sockaddr_in *) &cli_addr)->sin_port),
accept_fd);
#endif
#else
/* not very beautiful... */
accept_fd = (lws_sockfd_type)pollfd;
#endif
/*
* look at who we connected to and give user code a chance
* to reject based on client IP. There's no protocol selected
* yet so we issue this to protocols[0]
*/
if ((wsi->vhost->protocols[0].callback)(wsi,
LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
NULL, (void *)(lws_intptr_t)accept_fd, 0)) {
lwsl_debug("Callback denied network connection\n");
compatible_close(accept_fd);
break;
}
if (!(wsi->vhost->options & LWS_SERVER_OPTION_ONLY_RAW))
opts |= LWS_ADOPT_HTTP;
else
opts = LWS_ADOPT_SOCKET;
fd.sockfd = accept_fd;
if (!lws_adopt_descriptor_vhost(wsi->vhost, opts, fd,
NULL, NULL))
/* already closed cleanly as necessary */
return 1;
#if LWS_POSIX
} while (pt->fds_count < context->fd_limit_per_thread - 1 &&
lws_poll_listen_fd(&pt->fds[wsi->position_in_fds_table]) > 0);
#endif
return 0;
default:
break;
}
if (!lws_server_socket_service_ssl(wsi, accept_fd))
return 0;
fail:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 1;
}
LWS_VISIBLE int
lws_serve_http_file(struct lws *wsi, const char *file, const char *content_type,
const char *other_headers, int other_headers_len)
{
static const char * const intermediates[] = { "private", "public" };
struct lws_context *context = lws_get_context(wsi);
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
#if defined(LWS_WITH_RANGES)
struct lws_range_parsing *rp = &wsi->u.http.range;
#endif
char cache_control[50], *cc = "no-store";
unsigned char *response = pt->serv_buf + LWS_PRE;
unsigned char *p = response;
unsigned char *end = p + context->pt_serv_buf_size - LWS_PRE;
lws_filepos_t computed_total_content_length;
int ret = 0, cclen = 8, n = HTTP_STATUS_OK;
lws_fop_flags_t fflags = LWS_O_RDONLY;
#if defined(LWS_WITH_RANGES)
int ranges;
#endif
const struct lws_plat_file_ops *fops;
const char *vpath;
/*
* We either call the platform fops .open with first arg platform fops,
* or we call fops_zip .open with first arg platform fops, and fops_zip
* open will decide whether to switch to fops_zip or stay with fops_def.
*
* If wsi->u.http.fop_fd is already set, the caller already opened it
*/
if (!wsi->u.http.fop_fd) {
fops = lws_vfs_select_fops(wsi->context->fops, file, &vpath);
fflags |= lws_vfs_prepare_flags(wsi);
wsi->u.http.fop_fd = fops->LWS_FOP_OPEN(wsi->context->fops,
file, vpath, &fflags);
if (!wsi->u.http.fop_fd) {
lwsl_err("Unable to open '%s'\n", file);
return -1;
}
}
wsi->u.http.filelen = lws_vfs_get_length(wsi->u.http.fop_fd);
computed_total_content_length = wsi->u.http.filelen;
#if defined(LWS_WITH_RANGES)
ranges = lws_ranges_init(wsi, rp, wsi->u.http.filelen);
lwsl_debug("Range count %d\n", ranges);
/*
* no ranges -> 200;
* 1 range -> 206 + Content-Type: normal; Content-Range;
* more -> 206 + Content-Type: multipart/byteranges
* Repeat the true Content-Type in each multipart header
* along with Content-Range
*/
if (ranges < 0) {
/* it means he expressed a range in Range:, but it was illegal */
lws_return_http_status(wsi, HTTP_STATUS_REQ_RANGE_NOT_SATISFIABLE,
NULL);
if (lws_http_transaction_completed(wsi))
return -1; /* <0 means just hang up */
lws_vfs_file_close(&wsi->u.http.fop_fd);
return 0; /* == 0 means we dealt with the transaction complete */
}
if (ranges)
n = HTTP_STATUS_PARTIAL_CONTENT;
#endif
if (lws_add_http_header_status(wsi, n, &p, end))
return -1;
if ((wsi->u.http.fop_fd->flags & (LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP |
LWS_FOP_FLAG_COMPR_IS_GZIP)) ==
(LWS_FOP_FLAG_COMPR_ACCEPTABLE_GZIP | LWS_FOP_FLAG_COMPR_IS_GZIP)) {
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_CONTENT_ENCODING,
(unsigned char *)"gzip", 4, &p, end))
return -1;
lwsl_info("file is being provided in gzip\n");
}
if (
#if defined(LWS_WITH_RANGES)
ranges < 2 &&
#endif
content_type && content_type[0])
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)content_type,
strlen(content_type), &p, end))
return -1;
#if defined(LWS_WITH_RANGES)
if (ranges >= 2) { /* multipart byteranges */
strncpy(wsi->u.http.multipart_content_type, content_type,
sizeof(wsi->u.http.multipart_content_type) - 1);
wsi->u.http.multipart_content_type[
sizeof(wsi->u.http.multipart_content_type) - 1] = '\0';
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE,
(unsigned char *)"multipart/byteranges; boundary=_lws",
20, &p, end))
return -1;
/*
* our overall content length has to include
*
* - (n + 1) x "_lws\r\n"
* - n x Content-Type: xxx/xxx\r\n
* - n x Content-Range: bytes xxx-yyy/zzz\r\n
* - n x /r/n
* - the actual payloads (aggregated in rp->agg)
*
* Precompute it for the main response header
*/
computed_total_content_length = (lws_filepos_t)rp->agg +
6 /* final _lws\r\n */;
lws_ranges_reset(rp);
while (lws_ranges_next(rp)) {
n = lws_snprintf(cache_control, sizeof(cache_control),
"bytes %llu-%llu/%llu",
rp->start, rp->end, rp->extent);
computed_total_content_length +=
6 /* header _lws\r\n */ +
/* Content-Type: xxx/xxx\r\n */
14 + strlen(content_type) + 2 +
/* Content-Range: xxxx\r\n */
15 + n + 2 +
2; /* /r/n */
}
lws_ranges_reset(rp);
lws_ranges_next(rp);
}
if (ranges == 1) {
computed_total_content_length = (lws_filepos_t)rp->agg;
n = lws_snprintf(cache_control, sizeof(cache_control),
"bytes %llu-%llu/%llu",
rp->start, rp->end, rp->extent);
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CONTENT_RANGE,
(unsigned char *)cache_control,
n, &p, end))
return -1;
}
wsi->u.http.range.inside = 0;
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_ACCEPT_RANGES,
(unsigned char *)"bytes", 5, &p, end))
return -1;
#endif
if (!wsi->sending_chunked) {
if (lws_add_http_header_content_length(wsi,
computed_total_content_length,
&p, end))
return -1;
} else {
if (lws_add_http_header_by_token(wsi,
WSI_TOKEN_HTTP_TRANSFER_ENCODING,
(unsigned char *)"chunked",
7, &p, end))
return -1;
}
if (wsi->cache_secs && wsi->cache_reuse) {
if (wsi->cache_revalidate) {
cc = cache_control;
cclen = sprintf(cache_control, "%s max-age: %u",
intermediates[wsi->cache_intermediaries],
wsi->cache_secs);
} else {
cc = "no-cache";
cclen = 8;
}
}
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_CACHE_CONTROL,
(unsigned char *)cc, cclen, &p, end))
return -1;
if (wsi->u.http.connection_type == HTTP_CONNECTION_KEEP_ALIVE)
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_CONNECTION,
(unsigned char *)"keep-alive", 10, &p, end))
return -1;
if (other_headers) {
if ((end - p) < other_headers_len)
return -1;
memcpy(p, other_headers, other_headers_len);
p += other_headers_len;
}
if (lws_finalize_http_header(wsi, &p, end))
return -1;
ret = lws_write(wsi, response, p - response, LWS_WRITE_HTTP_HEADERS);
if (ret != (p - response)) {
lwsl_err("_write returned %d from %ld\n", ret,
(long)(p - response));
return -1;
}
wsi->u.http.filepos = 0;
wsi->state = LWSS_HTTP_ISSUING_FILE;
lws_callback_on_writable(wsi);
return 0;
}
int
lws_interpret_incoming_packet(struct lws *wsi, unsigned char **buf, size_t len)
{
int m;
lwsl_parser("%s: received %d byte packet\n", __func__, (int)len);
#if 0
lwsl_hexdump(*buf, len);
#endif
/* let the rx protocol state machine have as much as it needs */
while (len) {
/*
* we were accepting input but now we stopped doing so
*/
if (wsi->rxflow_bitmap) {
lws_rxflow_cache(wsi, *buf, 0, len);
lwsl_parser("%s: cached %ld\n", __func__, (long)len);
return 1;
}
if (wsi->u.ws.rx_draining_ext) {
m = lws_rx_sm(wsi, 0);
if (m < 0)
return -1;
continue;
}
/* account for what we're using in rxflow buffer */
if (wsi->rxflow_buffer) {
wsi->rxflow_pos++;
if (wsi->rxflow_pos > wsi->rxflow_len) {
lwsl_err("bumped rxflow buffer too far (%d / %d)", wsi->rxflow_pos, wsi->rxflow_len);
assert(0);
}
}
/* consume payload bytes efficiently */
if (wsi->lws_rx_parse_state ==
LWS_RXPS_PAYLOAD_UNTIL_LENGTH_EXHAUSTED) {
m = lws_payload_until_length_exhausted(wsi, buf, &len);
if (wsi->rxflow_buffer)
wsi->rxflow_pos += m;
}
if (wsi->rxflow_buffer && wsi->rxflow_pos == wsi->rxflow_len) {
lwsl_debug("%s: %p flow buf: drained\n", __func__, wsi);
lws_free_set_NULL(wsi->rxflow_buffer);
/* having drained the rxflow buffer, can rearm POLLIN */
#ifdef LWS_NO_SERVER
m =
#endif
_lws_rx_flow_control(wsi);
/* m ignored, needed for NO_SERVER case */
}
/* process the byte */
m = lws_rx_sm(wsi, *(*buf)++);
if (m < 0)
return -1;
len--;
}
lwsl_parser("%s: exit with %d unused\n", __func__, (int)len);
return 0;
}
LWS_VISIBLE void
lws_server_get_canonical_hostname(struct lws_context *context,
struct lws_context_creation_info *info)
{
if (lws_check_opt(info->options,
LWS_SERVER_OPTION_SKIP_SERVER_CANONICAL_NAME))
return;
#if LWS_POSIX && !defined(LWS_WITH_ESP32)
/* find canonical hostname */
gethostname((char *)context->canonical_hostname,
sizeof(context->canonical_hostname) - 1);
lwsl_info(" canonical_hostname = %s\n", context->canonical_hostname);
#else
(void)context;
#endif
}
LWS_VISIBLE LWS_EXTERN int
lws_chunked_html_process(struct lws_process_html_args *args,
struct lws_process_html_state *s)
{
char *sp, buffer[32];
const char *pc;
int old_len, n;
/* do replacements */
sp = args->p;
old_len = args->len;
args->len = 0;
s->start = sp;
while (sp < args->p + old_len) {
if (args->len + 7 >= args->max_len) {
lwsl_err("Used up interpret padding\n");
return -1;
}
if ((!s->pos && *sp == '$') || s->pos) {
int hits = 0, hit = 0;
if (!s->pos)
s->start = sp;
s->swallow[s->pos++] = *sp;
if (s->pos == sizeof(s->swallow) - 1)
goto skip;
for (n = 0; n < s->count_vars; n++)
if (!strncmp(s->swallow, s->vars[n], s->pos)) {
hits++;
hit = n;
}
if (!hits) {
skip:
s->swallow[s->pos] = '\0';
memcpy(s->start, s->swallow, s->pos);
args->len++;
s->pos = 0;
sp = s->start + 1;
continue;
}
if (hits == 1 && s->pos == strlen(s->vars[hit])) {
pc = s->replace(s->data, hit);
if (!pc)
pc = "NULL";
n = strlen(pc);
s->swallow[s->pos] = '\0';
if (n != s->pos) {
memmove(s->start + n,
s->start + s->pos,
old_len - (sp - args->p));
old_len += (n - s->pos) + 1;
}
memcpy(s->start, pc, n);
args->len++;
sp = s->start + 1;
s->pos = 0;
}
sp++;
continue;
}
args->len++;
sp++;
}
/* no space left for final chunk trailer */
if (args->final && args->len + 7 >= args->max_len)
return -1;
n = sprintf(buffer, "%X\x0d\x0a", args->len);
args->p -= n;
memcpy(args->p, buffer, n);
args->len += n;
if (args->final) {
sp = args->p + args->len;
*sp++ = '\x0d';
*sp++ = '\x0a';
*sp++ = '0';
*sp++ = '\x0d';
*sp++ = '\x0a';
*sp++ = '\x0d';
*sp++ = '\x0a';
args->len += 7;
} else {
sp = args->p + args->len;
*sp++ = '\x0d';
*sp++ = '\x0a';
args->len += 2;
}
return 0;
}
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