void lws_http2_configure_if_upgraded(struct lws *wsi)
{
#if OPENSSL_VERSION_NUMBER >= 0x10002000L
struct allocated_headers *ah;
const char *method = "alpn";
const unsigned char *name;
unsigned len;
SSL_get0_alpn_selected(wsi->ssl, &name, &len);
if (!len) {
SSL_get0_next_proto_negotiated(wsi->ssl, &name, &len);
method = "npn";
}
if (!len) {
lwsl_info("no npn/alpn upgrade\n");
return;
}
lwsl_info("negotiated %s using %s\n", name, method);
wsi->use_ssl = 1;
if (strncmp((char *)name, "http/1.1", 8) == 0)
return;
/* http2 */
/* adopt the header info */
ah = wsi->u.hdr.ah;
lws_union_transition(wsi, LWSCM_HTTP2_SERVING);
wsi->state = LWSS_HTTP2_AWAIT_CLIENT_PREFACE;
/* http2 union member has http union struct at start */
wsi->u.http.ah = ah;
lws_http2_init(&wsi->u.http2.peer_settings);
lws_http2_init(&wsi->u.http2.my_settings);
/* HTTP2 union */
#endif
}
int
lws_client_interpret_server_handshake(struct lws *wsi)
{
int n, len, okay = 0, isErrorCodeReceived = 0, port = 0, ssl = 0;
struct lws_context *context = wsi->context;
int close_reason = LWS_CLOSE_STATUS_PROTOCOL_ERR;
const char *pc, *prot, *ads = NULL, *path;
char *p;
#ifndef LWS_NO_EXTENSIONS
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
char *sb = (char *)&pt->serv_buf[0];
const struct lws_ext_options *opts;
const struct lws_extension *ext;
char ext_name[128];
const char *c, *a;
char ignore;
int more = 1;
void *v;
#endif
/*
* well, what the server sent looked reasonable for syntax.
* Now let's confirm it sent all the necessary headers
*/
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP);
if (!p) {
lwsl_info("no URI\n");
goto bail3;
}
n = atoi(p);
if (n == 301 || n == 302 || n == 303 || n == 307 || n == 308) {
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_LOCATION);
if (!p)
goto bail3;
if (lws_parse_uri(p, &prot, &ads, &port, &path))
goto bail3;
if (!strcmp(prot, "wss://") || !strcmp(prot, "https://"))
ssl = 1;
if (lws_client_reset(wsi, ssl, ads, port, path, ads)) {
lwsl_err("Redirect failed\n");
goto bail3;
}
return 0;
}
if (lws_hdr_total_length(wsi, WSI_TOKEN_ACCEPT) == 0) {
lwsl_info("no ACCEPT\n");
isErrorCodeReceived = 1;
goto bail3;
}
if (p && strncmp(p, "101", 3)) {
lwsl_warn(
"lws_client_handshake: got bad HTTP response '%s'\n", p);
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE);
if (!p) {
lwsl_info("no UPGRADE\n");
goto bail3;
}
strtolower(p);
if (strcmp(p, "websocket")) {
lwsl_warn(
"lws_client_handshake: got bad Upgrade header '%s'\n", p);
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_CONNECTION);
if (!p) {
lwsl_info("no Connection hdr\n");
goto bail3;
}
strtolower(p);
if (strcmp(p, "upgrade")) {
lwsl_warn("lws_client_int_s_hs: bad header %s\n", p);
goto bail3;
}
pc = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_SENT_PROTOCOLS);
if (!pc) {
lwsl_parser("lws_client_int_s_hs: no protocol list\n");
} else
lwsl_parser("lws_client_int_s_hs: protocol list '%s'\n", pc);
/*
* confirm the protocol the server wants to talk was in the list
* of protocols we offered
*/
len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
if (!len) {
lwsl_info("lws_client_int_s_hs: WSI_TOKEN_PROTOCOL is null\n");
/*
* no protocol name to work from,
* default to first protocol
*/
wsi->protocol = &context->protocols[0];
goto check_extensions;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL);
len = strlen(p);
while (pc && *pc && !okay) {
if (!strncmp(pc, p, len) &&
(pc[len] == ',' || pc[len] == '\0')) {
okay = 1;
continue;
}
while (*pc && *pc++ != ',')
;
while (*pc && *pc == ' ')
pc++;
}
if (!okay) {
lwsl_err("lws_client_int_s_hs: got bad protocol %s\n", p);
goto bail2;
}
/*
* identify the selected protocol struct and set it
*/
n = 0;
wsi->protocol = NULL;
while (context->protocols[n].callback && !wsi->protocol) {
if (strcmp(p, context->protocols[n].name) == 0) {
wsi->protocol = &context->protocols[n];
break;
}
n++;
}
if (wsi->protocol == NULL) {
lwsl_err("lws_client_int_s_hs: fail protocol %s\n", p);
goto bail2;
}
check_extensions:
#ifndef LWS_NO_EXTENSIONS
/* instantiate the accepted extensions */
if (!lws_hdr_total_length(wsi, WSI_TOKEN_EXTENSIONS)) {
lwsl_ext("no client extenstions allowed by server\n");
goto check_accept;
}
/*
* break down the list of server accepted extensions
* and go through matching them or identifying bogons
*/
if (lws_hdr_copy(wsi, sb, LWS_MAX_SOCKET_IO_BUF, WSI_TOKEN_EXTENSIONS) < 0) {
lwsl_warn("ext list from server failed to copy\n");
goto bail2;
}
c = sb;
n = 0;
ignore = 0;
a = NULL;
while (more) {
if (*c && (*c != ',' && *c != '\t')) {
if (*c == ';') {
ignore = 1;
if (!a)
a = c + 1;
}
if (ignore || *c == ' ') {
c++;
continue;
}
ext_name[n] = *c++;
if (n < sizeof(ext_name) - 1)
n++;
continue;
}
ext_name[n] = '\0';
ignore = 0;
if (!*c)
more = 0;
else {
c++;
if (!n)
continue;
}
/* check we actually support it */
lwsl_notice("checking client ext %s\n", ext_name);
n = 0;
ext = lws_get_context(wsi)->extensions;
while (ext && ext->callback) {
if (strcmp(ext_name, ext->name)) {
ext++;
continue;
}
n = 1;
lwsl_notice("instantiating client ext %s\n", ext_name);
/* instantiate the extension on this conn */
wsi->active_extensions[wsi->count_act_ext] = ext;
/* allow him to construct his ext instance */
ext->callback(lws_get_context(wsi), ext, wsi,
LWS_EXT_CB_CLIENT_CONSTRUCT,
(void *)&wsi->act_ext_user[wsi->count_act_ext],
(void *)&opts, 0);
/*
* allow the user code to override ext defaults if it
* wants to
*/
ext_name[0] = '\0';
if (user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_WS_EXT_DEFAULTS,
(char *)ext->name, ext_name,
sizeof(ext_name)))
goto bail2;
if (ext_name[0] &&
lws_ext_parse_options(ext, wsi, wsi->act_ext_user[
wsi->count_act_ext], opts, ext_name,
strlen(ext_name))) {
lwsl_err("%s: unable to parse user defaults '%s'",
__func__, ext_name);
goto bail2;
}
/*
* give the extension the server options
*/
if (a && lws_ext_parse_options(ext, wsi,
wsi->act_ext_user[wsi->count_act_ext],
opts, a, c - a)) {
lwsl_err("%s: unable to parse remote def '%s'",
__func__, a);
goto bail2;
}
if (ext->callback(lws_get_context(wsi), ext, wsi,
LWS_EXT_CB_OPTION_CONFIRM,
wsi->act_ext_user[wsi->count_act_ext],
NULL, 0)) {
lwsl_err("%s: ext %s rejects server options %s",
ext->name, a);
goto bail2;
}
wsi->count_act_ext++;
ext++;
}
if (n == 0) {
lwsl_warn("Unknown ext '%s'!\n", ext_name);
goto bail2;
}
a = NULL;
n = 0;
}
check_accept:
#endif
/*
* Confirm his accept token is the one we precomputed
*/
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_ACCEPT);
if (strcmp(p, wsi->u.hdr.ah->initial_handshake_hash_base64)) {
lwsl_warn("lws_client_int_s_hs: accept '%s' wrong vs '%s'\n", p,
wsi->u.hdr.ah->initial_handshake_hash_base64);
goto bail2;
}
/* allocate the per-connection user memory (if any) */
if (lws_ensure_user_space(wsi)) {
lwsl_err("Problem allocating wsi user mem\n");
goto bail2;
}
/*
* we seem to be good to go, give client last chance to check
* headers and OK it
*/
if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH,
wsi->user_space, NULL, 0))
goto bail2;
/* clear his proxy connection timeout */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
/* free up his parsing allocations */
lws_free_header_table(wsi);
lws_union_transition(wsi, LWSCM_WS_CLIENT);
wsi->state = LWSS_ESTABLISHED;
wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/*
* create the frame buffer for this connection according to the
* size mentioned in the protocol definition. If 0 there, then
* use a big default for compatibility
*/
n = wsi->protocol->rx_buffer_size;
if (!n)
n = LWS_MAX_SOCKET_IO_BUF;
n += LWS_PRE;
wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
if (!wsi->u.ws.rx_ubuf) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
goto bail2;
}
wsi->u.ws.rx_ubuf_alloc = n;
lwsl_info("Allocating client RX buffer %d\n", n);
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF, (const char *)&n,
sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
goto bail3;
}
lwsl_debug("handshake OK for protocol %s\n", wsi->protocol->name);
/* call him back to inform him he is up */
if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_ESTABLISHED,
wsi->user_space, NULL, 0))
goto bail3;
#ifndef LWS_NO_EXTENSIONS
/*
* inform all extensions, not just active ones since they
* already know
*/
ext = context->extensions;
while (ext && ext->callback) {
v = NULL;
for (n = 0; n < wsi->count_act_ext; n++)
if (wsi->active_extensions[n] == ext)
v = wsi->act_ext_user[n];
ext->callback(context, ext, wsi,
LWS_EXT_CB_ANY_WSI_ESTABLISHED, v, NULL, 0);
ext++;
}
#endif
return 0;
bail3:
close_reason = LWS_CLOSE_STATUS_NOSTATUS;
bail2:
if (wsi->protocol && wsi->state == LWSS_ESTABLISHED) {
if (isErrorCodeReceived && p) {
wsi->protocol->callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space, p,
(unsigned int)strlen(p));
} else {
wsi->protocol->callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space, NULL, 0);
}
}
lwsl_info("closing connection due to bail2 connection error\n");
/* closing will free up his parsing allocations */
lws_close_free_wsi(wsi, close_reason);
return 1;
}
int
lws_client_interpret_server_handshake(struct lws *wsi)
{
struct lws_context *context = wsi->context;
int close_reason = LWS_CLOSE_STATUS_PROTOCOL_ERR;
int n, len, okay = 0, isErrorCodeReceived = 0;
const char *pc;
char *p;
#ifndef LWS_NO_EXTENSIONS
const struct lws_extension *ext;
char ext_name[128];
const char *c;
int more = 1;
void *v;
#endif
/*
* well, what the server sent looked reasonable for syntax.
* Now let's confirm it sent all the necessary headers
*/
if (lws_hdr_total_length(wsi, WSI_TOKEN_ACCEPT) == 0) {
lwsl_info("no ACCEPT\n");
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP);
isErrorCodeReceived = 1;
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP);
if (!p) {
lwsl_info("no URI\n");
goto bail3;
}
if (p && strncmp(p, "101", 3)) {
lwsl_warn(
"lws_client_handshake: got bad HTTP response '%s'\n", p);
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE);
if (!p) {
lwsl_info("no UPGRADE\n");
goto bail3;
}
strtolower(p);
if (strcmp(p, "websocket")) {
lwsl_warn(
"lws_client_handshake: got bad Upgrade header '%s'\n", p);
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_CONNECTION);
if (!p) {
lwsl_info("no Connection hdr\n");
goto bail3;
}
strtolower(p);
if (strcmp(p, "upgrade")) {
lwsl_warn("lws_client_int_s_hs: bad header %s\n", p);
goto bail3;
}
pc = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_SENT_PROTOCOLS);
if (!pc) {
lwsl_parser("lws_client_int_s_hs: no protocol list\n");
} else
lwsl_parser("lws_client_int_s_hs: protocol list '%s'\n", pc);
/*
* confirm the protocol the server wants to talk was in the list
* of protocols we offered
*/
len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
if (!len) {
lwsl_info("lws_client_int_s_hs: WSI_TOKEN_PROTOCOL is null\n");
/*
* no protocol name to work from,
* default to first protocol
*/
wsi->protocol = &context->protocols[0];
goto check_extensions;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL);
len = strlen(p);
while (pc && *pc && !okay) {
if (!strncmp(pc, p, len) &&
(pc[len] == ',' || pc[len] == '\0')) {
okay = 1;
continue;
}
while (*pc && *pc++ != ',')
;
while (*pc && *pc == ' ')
pc++;
}
if (!okay) {
lwsl_err("lws_client_int_s_hs: got bad protocol %s\n", p);
goto bail2;
}
/*
* identify the selected protocol struct and set it
*/
n = 0;
wsi->protocol = NULL;
while (context->protocols[n].callback && !wsi->protocol) {
if (strcmp(p, context->protocols[n].name) == 0) {
wsi->protocol = &context->protocols[n];
break;
}
n++;
}
if (wsi->protocol == NULL) {
lwsl_err("lws_client_int_s_hs: fail protocol %s\n", p);
goto bail2;
}
check_extensions:
#ifndef LWS_NO_EXTENSIONS
/* instantiate the accepted extensions */
if (!lws_hdr_total_length(wsi, WSI_TOKEN_EXTENSIONS)) {
lwsl_ext("no client extenstions allowed by server\n");
goto check_accept;
}
/*
* break down the list of server accepted extensions
* and go through matching them or identifying bogons
*/
if (lws_hdr_copy(wsi, (char *)context->serv_buf,
sizeof(context->serv_buf), WSI_TOKEN_EXTENSIONS) < 0) {
lwsl_warn("ext list from server failed to copy\n");
goto bail2;
}
c = (char *)context->serv_buf;
n = 0;
while (more) {
if (*c && (*c != ',' && *c != ' ' && *c != '\t')) {
ext_name[n] = *c++;
if (n < sizeof(ext_name) - 1)
n++;
continue;
}
ext_name[n] = '\0';
if (!*c)
more = 0;
else {
c++;
if (!n)
continue;
}
/* check we actually support it */
lwsl_ext("checking client ext %s\n", ext_name);
n = 0;
ext = lws_get_context(wsi)->extensions;
while (ext && ext->callback) {
if (strcmp(ext_name, ext->name)) {
ext++;
continue;
}
n = 1;
lwsl_ext("instantiating client ext %s\n", ext_name);
/* instantiate the extension on this conn */
wsi->active_extensions_user[
wsi->count_active_extensions] =
lws_zalloc(ext->per_session_data_size);
if (wsi->active_extensions_user[
wsi->count_active_extensions] == NULL) {
lwsl_err("Out of mem\n");
goto bail2;
}
wsi->active_extensions[
wsi->count_active_extensions] = ext;
/* allow him to construct his context */
ext->callback(lws_get_context(wsi), ext, wsi,
LWS_EXT_CALLBACK_CLIENT_CONSTRUCT,
wsi->active_extensions_user[
wsi->count_active_extensions],
NULL, 0);
wsi->count_active_extensions++;
ext++;
}
if (n == 0) {
lwsl_warn("Unknown ext '%s'!\n", ext_name);
goto bail2;
}
n = 0;
}
check_accept:
#endif
/*
* Confirm his accept token is the one we precomputed
*/
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_ACCEPT);
if (strcmp(p, wsi->u.hdr.ah->initial_handshake_hash_base64)) {
lwsl_warn("lws_client_int_s_hs: accept %s wrong vs %s\n", p,
wsi->u.hdr.ah->initial_handshake_hash_base64);
goto bail2;
}
/* allocate the per-connection user memory (if any) */
if (lws_ensure_user_space(wsi)) {
lwsl_err("Problem allocating wsi user mem\n");
goto bail2;
}
/*
* we seem to be good to go, give client last chance to check
* headers and OK it
*/
if (wsi->protocol->callback(wsi,
LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH,
wsi->user_space, NULL, 0))
goto bail2;
/* clear his proxy connection timeout */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
/* free up his parsing allocations */
lws_free(wsi->u.hdr.ah);
lws_union_transition(wsi, LWSCM_WS_CLIENT);
wsi->state = LWSS_ESTABLISHED;
wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/*
* create the frame buffer for this connection according to the
* size mentioned in the protocol definition. If 0 there, then
* use a big default for compatibility
*/
n = wsi->protocol->rx_buffer_size;
if (!n)
n = LWS_MAX_SOCKET_IO_BUF;
n += LWS_SEND_BUFFER_PRE_PADDING + LWS_SEND_BUFFER_POST_PADDING;
wsi->u.ws.rx_user_buffer = lws_malloc(n);
if (!wsi->u.ws.rx_user_buffer) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
goto bail2;
}
lwsl_info("Allocating client RX buffer %d\n", n);
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF, (const char *)&n,
sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
goto bail3;
}
lwsl_debug("handshake OK for protocol %s\n", wsi->protocol->name);
/* call him back to inform him he is up */
if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_ESTABLISHED,
wsi->user_space, NULL, 0))
goto bail3;
#ifndef LWS_NO_EXTENSIONS
/*
* inform all extensions, not just active ones since they
* already know
*/
ext = context->extensions;
while (ext && ext->callback) {
v = NULL;
for (n = 0; n < wsi->count_active_extensions; n++)
if (wsi->active_extensions[n] == ext)
v = wsi->active_extensions_user[n];
ext->callback(context, ext, wsi,
LWS_EXT_CALLBACK_ANY_WSI_ESTABLISHED, v, NULL, 0);
ext++;
}
#endif
return 0;
bail3:
lws_free_set_NULL(wsi->u.ws.rx_user_buffer);
close_reason = LWS_CLOSE_STATUS_NOSTATUS;
bail2:
if (wsi->protocol) {
if (isErrorCodeReceived && p) {
wsi->protocol->callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space, p,
(unsigned int)strlen(p));
} else {
wsi->protocol->callback(wsi,
LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space, NULL, 0);
}
}
lwsl_info("closing connection due to bail2 connection error\n");
/* free up his parsing allocations */
lws_free_set_NULL(wsi->u.hdr.ah);
lws_close_free_wsi(wsi, close_reason);
return 1;
}
int lws_context_init_server(struct lws_context_creation_info *info,
struct lws_context *context)
{
#ifdef LWS_USE_IPV6
struct sockaddr_in6 serv_addr6;
#endif
#if LWS_POSIX
struct sockaddr_in serv_addr4;
socklen_t len = sizeof(struct sockaddr);
struct sockaddr_in sin;
struct sockaddr *v;
int n, opt = 1;
#endif
lws_sockfd_type sockfd;
struct lws *wsi;
/* set up our external listening socket we serve on */
if (info->port == CONTEXT_PORT_NO_LISTEN)
return 0;
#if LWS_POSIX
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context))
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
else
#endif
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
#else
sockfd = mbed3_create_tcp_stream_socket();
if (!lws_sockfd_valid(sockfd)) {
#endif
lwsl_err("ERROR opening socket\n");
return 1;
}
#if LWS_POSIX
/*
* allow us to restart even if old sockets in TIME_WAIT
*/
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(const void *)&opt, sizeof(opt)) < 0) {
compatible_close(sockfd);
return 1;
}
#endif
lws_plat_set_socket_options(context, sockfd);
#if LWS_POSIX
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
v = (struct sockaddr *)&serv_addr6;
n = sizeof(struct sockaddr_in6);
bzero((char *) &serv_addr6, sizeof(serv_addr6));
serv_addr6.sin6_addr = in6addr_any;
serv_addr6.sin6_family = AF_INET6;
serv_addr6.sin6_port = htons(info->port);
} else
#endif
{
v = (struct sockaddr *)&serv_addr4;
n = sizeof(serv_addr4);
bzero((char *) &serv_addr4, sizeof(serv_addr4));
serv_addr4.sin_addr.s_addr = INADDR_ANY;
serv_addr4.sin_family = AF_INET;
if (info->iface && interface_to_sa(context, info->iface,
(struct sockaddr_in *)v, n) < 0) {
lwsl_err("Unable to find interface %s\n", info->iface);
goto bail;
}
serv_addr4.sin_port = htons(info->port);
} /* ipv4 */
n = bind(sockfd, v, n);
if (n < 0) {
lwsl_err("ERROR on binding to port %d (%d %d)\n",
info->port, n, LWS_ERRNO);
goto bail;
}
if (getsockname(sockfd, (struct sockaddr *)&sin, &len) == -1)
lwsl_warn("getsockname: %s\n", strerror(LWS_ERRNO));
else
info->port = ntohs(sin.sin_port);
#endif
context->listen_port = info->port;
wsi = lws_zalloc(sizeof(struct lws));
if (wsi == NULL) {
lwsl_err("Out of mem\n");
goto bail;
}
wsi->context = context;
wsi->sock = sockfd;
wsi->mode = LWSCM_SERVER_LISTENER;
wsi->protocol = context->protocols;
context->wsi_listening = wsi;
if (insert_wsi_socket_into_fds(context, wsi))
goto bail;
context->lserv_mod = LWS_lserv_mod;
context->lserv_count = 0;
context->lserv_fd = sockfd;
#if LWS_POSIX
listen(sockfd, LWS_SOMAXCONN);
#else
mbed3_tcp_stream_bind(sockfd, info->port, wsi);
#endif
lwsl_notice(" Listening on port %d\n", info->port);
return 0;
bail:
compatible_close(sockfd);
return 1;
}
int
_lws_server_listen_accept_flow_control(struct lws_context *context, int on)
{
struct lws *wsi = context->wsi_listening;
int n;
if (!wsi)
return 0;
lwsl_debug("%s: wsi %p: state %d\n", __func__, (void *)wsi, on);
if (on)
n = lws_change_pollfd(wsi, 0, LWS_POLLIN);
else
n = lws_change_pollfd(wsi, LWS_POLLIN, 0);
return n;
}
int lws_http_action(struct lws *wsi)
{
enum http_connection_type connection_type;
enum http_version request_version;
char content_length_str[32];
unsigned int n, count = 0;
char http_version_str[10];
char http_conn_str[20];
int http_version_len;
char *uri_ptr = NULL;
int uri_len = 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,
#ifdef LWS_USE_HTTP2
WSI_TOKEN_HTTP_COLON_PATH,
#endif
};
#ifdef _DEBUG
static const char * const method_names[] = {
"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE",
#ifdef LWS_USE_HTTP2
":path",
#endif
};
#endif
/* it's not websocket.... shall we accept it as http? */
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");
goto bail_nuke_ah;
}
if (count != 1) {
lwsl_warn("multiple methods?\n");
goto bail_nuke_ah;
}
if (lws_ensure_user_space(wsi))
goto bail_nuke_ah;
for (n = 0; n < ARRAY_SIZE(methods); n++)
if (lws_hdr_total_length(wsi, methods[n])) {
uri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
uri_len = lws_hdr_total_length(wsi, methods[n]);
lwsl_info("Method: %s request for '%s'\n",
method_names[n], uri_ptr);
break;
}
/* HTTP header had a content length? */
wsi->u.http.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.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.content_length = atoi(content_length_str);
}
/* 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) {
/*
* if there is content supposed to be coming,
* put a timeout on it having arrived
*/
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
AWAITING_TIMEOUT);
n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
wsi->user_space, uri_ptr, uri_len);
}
/* now drop the header info we kept a pointer to */
lws_free_header_table(wsi);
if (n) {
lwsl_info("LWS_CALLBACK_HTTP closing\n");
return 1; /* struct ah ptr already nuked */ }
/*
* 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: */
if (wsi->u.http.content_length > 0)
wsi->state = LWSS_HTTP_BODY;
return 0;
bail_nuke_ah:
lws_free_header_table(wsi);
return 1;
}
int lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
{
struct lws_context *context = lws_get_context(wsi);
struct allocated_headers *ah;
int protocol_len, n, hit;
char protocol_list[128];
char protocol_name[32];
char *p;
/* LWSCM_WS_SERVING */
while (len--) {
if (lws_parse(wsi, *(*buf)++)) {
lwsl_info("lws_parse failed\n");
goto bail_nuke_ah;
}
if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
continue;
lwsl_parser("lws_parse sees parsing complete\n");
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) ||
!lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
ah = wsi->u.hdr.ah;
lws_union_transition(wsi, LWSCM_HTTP_SERVING_ACCEPTED);
wsi->state = LWSS_HTTP;
wsi->u.http.fd = LWS_INVALID_FILE;
/* 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;
}
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"websocket"))
goto upgrade_ws;
#ifdef LWS_USE_HTTP2
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"h2c-14"))
goto upgrade_h2c;
#endif
/* dunno what he wanted to upgrade to */
goto bail_nuke_ah;
#ifdef LWS_USE_HTTP2
upgrade_h2c:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
lwsl_err("missing http2_settings\n");
goto bail_nuke_ah;
}
lwsl_err("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;
lws_http2_init(&wsi->u.http2.peer_settings);
lws_http2_init(&wsi->u.http2.my_settings);
/* HTTP2 union */
lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
(unsigned char *)protocol_list, n);
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) {
unsigned int n = 0;
while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
protocol_name[n++] = *p++;
protocol_name[n] = '\0';
if (*p)
p++;
lwsl_info("checking %s\n", protocol_name);
n = 0;
while (context->protocols[n].callback) {
if (context->protocols[n].name &&
!strcmp(context->protocols[n].name,
protocol_name)) {
lwsl_info("prot match %d\n", n);
wsi->protocol = &context->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_err("No protocol from \"%s\" supported\n",
protocol_list);
goto bail_nuke_ah;
}
/*
* some clients only have one protocol and
* do not sent the protocol list header...
* allow it and match to protocol 0
*/
lwsl_info("defaulting to prot 0 handler\n");
wsi->protocol = &context->protocols[0];
}
/* 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_warn("Unknown client spec version %d\n",
wsi->ietf_spec_revision);
goto bail_nuke_ah;
}
/* drop the header info -- no bail_nuke_ah after this */
lws_free_header_table(wsi);
lws_union_transition(wsi, LWSCM_WS_SERVING);
/*
* 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 = LWS_MAX_SOCKET_IO_BUF;
n += LWS_PRE;
wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
if (!wsi->u.ws.rx_ubuf) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
return 1;
}
lwsl_info("Allocating RX buffer %d\n", n);
#if LWS_POSIX
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF,
(const char *)&n, sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
return 1;
}
#endif
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
} /* while all chars are handled */
return 0;
bail_nuke_ah:
/* drop the header info */
lws_free_header_table(wsi);
return 1;
}
struct lws *
lws_create_new_server_wsi(struct lws_context *context)
{
struct lws *new_wsi;
new_wsi = lws_zalloc(sizeof(struct lws));
if (new_wsi == NULL) {
lwsl_err("Out of memory for new connection\n");
return NULL;
}
new_wsi->context = context;
new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/* intialize 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(context);
#endif
if (lws_allocate_header_table(new_wsi)) {
lws_free(new_wsi);
return NULL;
}
/*
* these can only be set once the protocol is known
* we set an unestablished connection's protocol pointer
* to the start of the supported list, so it can look
* for matching ones during the handshake
*/
new_wsi->protocol = context->protocols;
new_wsi->user_space = NULL;
new_wsi->ietf_spec_revision = 0;
new_wsi->sock = LWS_SOCK_INVALID;
/*
* outermost create notification for wsi
* no user_space because no protocol selection
*/
context->protocols[0].callback(new_wsi, LWS_CALLBACK_WSI_CREATE, NULL,
NULL, 0);
return new_wsi;
}
/**
* lws_http_transaction_completed() - wait for new http transaction or close
* @wsi: websocket connection
*
* Returns 1 if the HTTP connection must close now
* Returns 0 and resets connection to wait for new HTTP header /
* transaction if possible
*/
LWS_VISIBLE
int lws_http_transaction_completed(struct lws *wsi)
{
lwsl_debug("%s: wsi %p\n", __func__, wsi);
/* if we can't go back to accept new headers, drop the connection */
if (wsi->u.http.connection_type != HTTP_CONNECTION_KEEP_ALIVE) {
lwsl_info("%s: close connection\n", __func__);
return 1;
}
/* otherwise set ourselves up ready to go again */
wsi->state = LWSS_HTTP;
wsi->mode = LWSCM_HTTP_SERVING;
wsi->u.http.content_length = 0;
/* He asked for it to stay alive indefinitely */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
if (lws_allocate_header_table(wsi))
return 1;
/* If we're (re)starting on headers, need other implied init */
wsi->u.hdr.ues = URIES_IDLE;
lwsl_info("%s: keep-alive await new transaction\n", __func__);
return 0;
}
LWS_VISIBLE struct lws *
lws_client_connect_via_info(struct lws_client_connect_info *i)
{
struct lws *wsi;
int v = SPEC_LATEST_SUPPORTED;
const struct lws_protocols *p;
if (i->context->requested_kill)
return NULL;
if (!i->context->protocol_init_done)
lws_protocol_init(i->context);
wsi = lws_zalloc(sizeof(struct lws));
if (wsi == NULL)
goto bail;
wsi->context = i->context;
/* assert the mode and union status (hdr) clearly */
lws_union_transition(wsi, LWSCM_HTTP_CLIENT);
wsi->desc.sockfd = LWS_SOCK_INVALID;
/* 1) fill up the wsi with stuff from the connect_info as far as it
* can go. It's because not only is our connection async, we might
* not even be able to get ahold of an ah at this point.
*/
/* -1 means just use latest supported */
if (i->ietf_version_or_minus_one != -1 && i->ietf_version_or_minus_one)
v = i->ietf_version_or_minus_one;
wsi->ietf_spec_revision = v;
wsi->user_space = NULL;
wsi->state = LWSS_CLIENT_UNCONNECTED;
wsi->pending_timeout = NO_PENDING_TIMEOUT;
wsi->position_in_fds_table = -1;
wsi->c_port = i->port;
wsi->vhost = i->vhost;
if (!wsi->vhost)
wsi->vhost = i->context->vhost_list;
wsi->protocol = &wsi->vhost->protocols[0];
/* for http[s] connection, allow protocol selection by name */
if (i->method && i->vhost && i->protocol) {
p = lws_vhost_name_to_protocol(i->vhost, i->protocol);
if (p)
wsi->protocol = p;
}
if (wsi && !wsi->user_space && i->userdata) {
wsi->user_space_externally_allocated = 1;
wsi->user_space = i->userdata;
} else
/* if we stay in http, we can assign the user space now,
* otherwise do it after the protocol negotiated
*/
if (i->method)
if (lws_ensure_user_space(wsi))
goto bail;
#ifdef LWS_OPENSSL_SUPPORT
wsi->use_ssl = i->ssl_connection;
#else
if (i->ssl_connection) {
lwsl_err("libwebsockets not configured for ssl\n");
goto bail;
}
#endif
/* 2) stash the things from connect_info that we can't process without
* an ah. Because if no ah, we will go on the ah waiting list and
* process those things later (after the connect_info and maybe the
* things pointed to have gone out of scope.
*/
wsi->u.hdr.stash = lws_malloc(sizeof(*wsi->u.hdr.stash));
if (!wsi->u.hdr.stash) {
lwsl_err("%s: OOM\n", __func__);
goto bail;
}
wsi->u.hdr.stash->origin[0] = '\0';
wsi->u.hdr.stash->protocol[0] = '\0';
wsi->u.hdr.stash->method[0] = '\0';
wsi->u.hdr.stash->iface[0] = '\0';
strncpy(wsi->u.hdr.stash->address, i->address,
sizeof(wsi->u.hdr.stash->address) - 1);
strncpy(wsi->u.hdr.stash->path, i->path,
sizeof(wsi->u.hdr.stash->path) - 1);
strncpy(wsi->u.hdr.stash->host, i->host,
sizeof(wsi->u.hdr.stash->host) - 1);
if (i->origin)
strncpy(wsi->u.hdr.stash->origin, i->origin,
sizeof(wsi->u.hdr.stash->origin) - 1);
if (i->protocol)
strncpy(wsi->u.hdr.stash->protocol, i->protocol,
sizeof(wsi->u.hdr.stash->protocol) - 1);
if (i->method)
strncpy(wsi->u.hdr.stash->method, i->method,
sizeof(wsi->u.hdr.stash->method) - 1);
if (i->iface)
strncpy(wsi->u.hdr.stash->iface, i->iface,
sizeof(wsi->u.hdr.stash->iface) - 1);
wsi->u.hdr.stash->address[sizeof(wsi->u.hdr.stash->address) - 1] = '\0';
wsi->u.hdr.stash->path[sizeof(wsi->u.hdr.stash->path) - 1] = '\0';
wsi->u.hdr.stash->host[sizeof(wsi->u.hdr.stash->host) - 1] = '\0';
wsi->u.hdr.stash->origin[sizeof(wsi->u.hdr.stash->origin) - 1] = '\0';
wsi->u.hdr.stash->protocol[sizeof(wsi->u.hdr.stash->protocol) - 1] = '\0';
wsi->u.hdr.stash->method[sizeof(wsi->u.hdr.stash->method) - 1] = '\0';
wsi->u.hdr.stash->iface[sizeof(wsi->u.hdr.stash->iface) - 1] = '\0';
if (i->pwsi)
*i->pwsi = wsi;
/* if we went on the waiting list, no probs just return the wsi
* when we get the ah, now or later, he will call
* lws_client_connect_via_info2() below.
*/
if (lws_header_table_attach(wsi, 0) < 0) {
/*
* if we failed here, the connection is already closed
* and freed.
*/
goto bail1;
}
if (i->parent_wsi) {
lwsl_info("%s: created child %p of parent %p\n", __func__,
wsi, i->parent_wsi);
wsi->parent = i->parent_wsi;
wsi->sibling_list = i->parent_wsi->child_list;
i->parent_wsi->child_list = wsi;
}
#ifdef LWS_WITH_HTTP_PROXY
if (i->uri_replace_to)
wsi->rw = lws_rewrite_create(wsi, html_parser_cb,
i->uri_replace_from,
i->uri_replace_to);
#endif
return wsi;
bail:
lws_free(wsi);
bail1:
if (i->pwsi)
*i->pwsi = NULL;
return NULL;
}
int lws_context_init_server(struct lws_context_creation_info *info,
struct lws_context *context)
{
#ifdef LWS_USE_IPV6
struct sockaddr_in6 serv_addr6;
#endif
#if LWS_POSIX
struct sockaddr_in serv_addr4;
socklen_t len = sizeof(struct sockaddr);
struct sockaddr_in sin;
struct sockaddr *v;
int n, opt = 1;
#endif
lws_sockfd_type sockfd;
struct lws *wsi;
/* set up our external listening socket we serve on */
if (info->port == CONTEXT_PORT_NO_LISTEN)
return 0;
#if LWS_POSIX
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context))
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
else
#endif
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
#else
sockfd = mbed3_create_tcp_stream_socket();
if (!lws_sockfd_valid(sockfd)) {
#endif
lwsl_err("ERROR opening socket\n");
return 1;
}
#if LWS_POSIX
/*
* allow us to restart even if old sockets in TIME_WAIT
*/
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(const void *)&opt, sizeof(opt)) < 0) {
compatible_close(sockfd);
return 1;
}
#endif
lws_plat_set_socket_options(context, sockfd);
#if LWS_POSIX
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
v = (struct sockaddr *)&serv_addr6;
n = sizeof(struct sockaddr_in6);
bzero((char *) &serv_addr6, sizeof(serv_addr6));
serv_addr6.sin6_addr = in6addr_any;
serv_addr6.sin6_family = AF_INET6;
serv_addr6.sin6_port = htons(info->port);
} else
#endif
{
v = (struct sockaddr *)&serv_addr4;
n = sizeof(serv_addr4);
bzero((char *) &serv_addr4, sizeof(serv_addr4));
serv_addr4.sin_addr.s_addr = INADDR_ANY;
serv_addr4.sin_family = AF_INET;
if (info->iface) {
if (interface_to_sa(context, info->iface,
(struct sockaddr_in *)v, n) < 0) {
lwsl_err("Unable to find interface %s\n",
info->iface);
compatible_close(sockfd);
return 1;
}
}
serv_addr4.sin_port = htons(info->port);
} /* ipv4 */
n = bind(sockfd, v, n);
if (n < 0) {
lwsl_err("ERROR on binding to port %d (%d %d)\n",
info->port, n, LWS_ERRNO);
compatible_close(sockfd);
return 1;
}
if (getsockname(sockfd, (struct sockaddr *)&sin, &len) == -1)
lwsl_warn("getsockname: %s\n", strerror(LWS_ERRNO));
else
info->port = ntohs(sin.sin_port);
#endif
context->listen_port = info->port;
wsi = lws_zalloc(sizeof(struct lws));
if (wsi == NULL) {
lwsl_err("Out of mem\n");
compatible_close(sockfd);
return 1;
}
wsi->sock = sockfd;
wsi->mode = LWS_CONNMODE_SERVER_LISTENER;
wsi->protocol = context->protocols;
if (insert_wsi_socket_into_fds(context, wsi)) {
compatible_close(sockfd);
return 1;
}
context->listen_service_modulo = LWS_LISTEN_SERVICE_MODULO;
context->listen_service_count = 0;
context->listen_service_fd = sockfd;
#if LWS_POSIX
listen(sockfd, LWS_SOMAXCONN);
#else
mbed3_tcp_stream_bind(sockfd, info->port, wsi);
#endif
lwsl_notice(" Listening on port %d\n", info->port);
return 0;
}
int
_lws_rx_flow_control(struct lws *wsi)
{
struct lws_context *context = wsi->protocol->owning_server;
/* there is no pending change */
if (!(wsi->rxflow_change_to & LWS_RXFLOW_PENDING_CHANGE))
return 0;
/* stuff is still buffered, not ready to really accept new input */
if (wsi->rxflow_buffer) {
/* get ourselves called back to deal with stashed buffer */
lws_callback_on_writable(context, wsi);
return 0;
}
/* pending is cleared, we can change rxflow state */
wsi->rxflow_change_to &= ~LWS_RXFLOW_PENDING_CHANGE;
lwsl_info("rxflow: wsi %p change_to %d\n", wsi,
wsi->rxflow_change_to & LWS_RXFLOW_ALLOW);
/* adjust the pollfd for this wsi */
if (wsi->rxflow_change_to & LWS_RXFLOW_ALLOW) {
if (lws_change_pollfd(wsi, 0, LWS_POLLIN)) {
lwsl_info("%s: fail\n", __func__);
return -1;
}
} else
if (lws_change_pollfd(wsi, LWS_POLLIN, 0))
return -1;
return 0;
}
int lws_http_action(struct lws_context *context, struct lws *wsi)
{
enum http_connection_type connection_type = HTTP_CONNECTION_KEEP_ALIVE;
enum http_version request_version;
char content_length_str[32];
unsigned int n, count = 0;
char http_version_str[10];
char http_conn_str[20];
int http_version_len;
char *uri_ptr = NULL;
int uri_len = 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,
#ifdef LWS_USE_HTTP2
WSI_TOKEN_HTTP_COLON_PATH,
#endif
};
#ifdef _DEBUG
static const char * const method_names[] = {
"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE",
#ifdef LWS_USE_HTTP2
":path",
#endif
};
#endif
/* it's not websocket.... shall we accept it as http? */
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");
goto bail_nuke_ah;
}
if (count != 1) {
lwsl_warn("multiple methods?\n");
goto bail_nuke_ah;
}
if (lws_ensure_user_space(wsi))
goto bail_nuke_ah;
for (n = 0; n < ARRAY_SIZE(methods); n++)
if (lws_hdr_total_length(wsi, methods[n])) {
uri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
uri_len = lws_hdr_total_length(wsi, methods[n]);
lwsl_info("Method: %s request for '%s'\n",
method_names[n], uri_ptr);
break;
}
/* HTTP header had a content length? */
wsi->u.http.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.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.content_length = atoi(content_length_str);
}
/* 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(context, wsi,
LWS_CALLBACK_FILTER_HTTP_CONNECTION,
wsi->user_space, uri_ptr, uri_len);
if (!n) {
/*
* if there is content supposed to be coming,
* put a timeout on it having arrived
*/
lws_set_timeout(wsi, PENDING_TIMEOUT_HTTP_CONTENT,
AWAITING_TIMEOUT);
n = wsi->protocol->callback(context, wsi, LWS_CALLBACK_HTTP,
wsi->user_space, uri_ptr, uri_len);
}
/* now drop the header info we kept a pointer to */
lws_free2(wsi->u.http.ah);
if (n) {
lwsl_info("LWS_CALLBACK_HTTP closing\n");
return 1; /* struct ah ptr already nuked */ }
/*
* 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 != WSI_STATE_HTTP_ISSUING_FILE)
/* Prepare to read body if we have a content length: */
if (wsi->u.http.content_length > 0)
wsi->state = WSI_STATE_HTTP_BODY;
return 0;
bail_nuke_ah:
/* drop the header info */
lws_free2(wsi->u.hdr.ah);
return 1;
}
int lws_handshake_server(struct lws_context *context, struct lws *wsi,
unsigned char **buf, size_t len)
{
struct allocated_headers *ah;
int protocol_len, n, hit;
char protocol_list[128];
char protocol_name[32];
char *p;
/* LWS_CONNMODE_WS_SERVING */
while (len--) {
if (lws_parse(context, wsi, *(*buf)++)) {
lwsl_info("lws_parse failed\n");
goto bail_nuke_ah;
}
if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
continue;
lwsl_parser("lws_parse sees parsing complete\n");
wsi->mode = LWS_CONNMODE_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) ||
!lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
ah = wsi->u.hdr.ah;
lws_union_transition(wsi, LWS_CONNMODE_HTTP_SERVING_ACCEPTED);
wsi->state = WSI_STATE_HTTP;
wsi->u.http.fd = LWS_INVALID_FILE;
/* expose it at the same offset as u.hdr */
wsi->u.http.ah = ah;
n = lws_http_action(context, wsi);
return n;
}
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"websocket"))
goto upgrade_ws;
#ifdef LWS_USE_HTTP2
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"h2c-14"))
goto upgrade_h2c;
#endif
/* dunno what he wanted to upgrade to */
goto bail_nuke_ah;
#ifdef LWS_USE_HTTP2
upgrade_h2c:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
lwsl_err("missing http2_settings\n");
goto bail_nuke_ah;
}
lwsl_err("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, LWS_CONNMODE_HTTP2_SERVING);
/* http2 union member has http union struct at start */
wsi->u.http.ah = ah;
lws_http2_init(&wsi->u.http2.peer_settings);
lws_http2_init(&wsi->u.http2.my_settings);
/* HTTP2 union */
lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
(unsigned char *)protocol_list, n);
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 = WSI_STATE_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) {
unsigned int n = 0;
while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
protocol_name[n++] = *p++;
protocol_name[n] = '\0';
if (*p)
p++;
lwsl_info("checking %s\n", protocol_name);
n = 0;
while (wsi->protocol && context->protocols[n].callback) {
if (!wsi->protocol->name) {
n++;
continue;
}
if (!strcmp(context->protocols[n].name,
protocol_name)) {
lwsl_info("prot match %d\n", n);
wsi->protocol = &context->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) ==
NULL) {
/*
* some clients only have one protocol and
* do not sent the protocol list header...
* allow it and match to protocol 0
*/
lwsl_info("defaulting to prot 0 handler\n");
wsi->protocol = &context->protocols[0];
} else {
lwsl_err("No protocol from list \"%s\" supported\n",
protocol_list);
goto bail_nuke_ah;
}
}
/* 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->protocol->owning_server, 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_warn("Unknown client spec version %d\n",
wsi->ietf_spec_revision);
goto bail_nuke_ah;
}
/* drop the header info -- no bail_nuke_ah after this */
lws_free_header_table(wsi);
lws_union_transition(wsi, LWS_CONNMODE_WS_SERVING);
/*
* 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 = LWS_MAX_SOCKET_IO_BUF;
n += LWS_SEND_BUFFER_PRE_PADDING + LWS_SEND_BUFFER_POST_PADDING;
wsi->u.ws.rx_user_buffer = lws_malloc(n);
if (!wsi->u.ws.rx_user_buffer) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
return 1;
}
lwsl_info("Allocating RX buffer %d\n", n);
#if LWS_POSIX
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF,
(const char *)&n, sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
return 1;
}
#endif
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
} /* while all chars are handled */
return 0;
bail_nuke_ah:
/* drop the header info */
lws_free_header_table(wsi);
return 1;
}
struct lws *
lws_create_new_server_wsi(struct lws_context *context)
{
struct lws *new_wsi;
new_wsi = lws_zalloc(sizeof(struct lws));
if (new_wsi == NULL) {
lwsl_err("Out of memory for new connection\n");
return NULL;
}
new_wsi->pending_timeout = NO_PENDING_TIMEOUT;
new_wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/* intialize the instance struct */
new_wsi->state = WSI_STATE_HTTP;
new_wsi->mode = LWS_CONNMODE_HTTP_SERVING;
new_wsi->hdr_parsing_completed = 0;
#ifdef LWS_OPENSSL_SUPPORT
new_wsi->use_ssl = LWS_SSL_ENABLED(context);
#endif
if (lws_allocate_header_table(new_wsi)) {
lws_free(new_wsi);
return NULL;
}
/*
* these can only be set once the protocol is known
* we set an unestablished connection's protocol pointer
* to the start of the supported list, so it can look
* for matching ones during the handshake
*/
new_wsi->protocol = context->protocols;
new_wsi->user_space = NULL;
new_wsi->ietf_spec_revision = 0;
new_wsi->sock = LWS_SOCK_INVALID;
/*
* outermost create notification for wsi
* no user_space because no protocol selection
*/
context->protocols[0].callback(context, new_wsi,
LWS_CALLBACK_WSI_CREATE, NULL, NULL, 0);
return new_wsi;
}
/**
* lws_http_transaction_completed() - wait for new http transaction or close
* @wsi: websocket connection
*
* Returns 1 if the HTTP connection must close now
* Returns 0 and resets connection to wait for new HTTP header /
* transaction if possible
*/
LWS_VISIBLE
int lws_http_transaction_completed(struct lws *wsi)
{
/* if we can't go back to accept new headers, drop the connection */
if (wsi->u.http.connection_type == HTTP_CONNECTION_CLOSE) {
lwsl_info("%s: close connection\n", __func__);
return 1;
}
/* otherwise set ourselves up ready to go again */
wsi->state = WSI_STATE_HTTP;
wsi->mode = LWS_CONNMODE_HTTP_SERVING;
wsi->u.http.content_length = 0;
/* He asked for it to stay alive indefinitely */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
if (lws_allocate_header_table(wsi))
return 1;
/* If we're (re)starting on headers, need other implied init */
wsi->u.hdr.ues = URIES_IDLE;
lwsl_info("%s: keep-alive await new transaction\n", __func__);
return 0;
}
LWS_VISIBLE
int lws_server_socket_service(struct lws_context *context,
struct lws *wsi, struct lws_pollfd *pollfd)
{
lws_sockfd_type accept_fd = LWS_SOCK_INVALID;
#if LWS_POSIX
struct sockaddr_in cli_addr;
socklen_t clilen;
#endif
struct lws *new_wsi = NULL;
int n, len;
switch (wsi->mode) {
case LWS_CONNMODE_HTTP_SERVING:
case LWS_CONNMODE_HTTP_SERVING_ACCEPTED:
case LWS_CONNMODE_HTTP2_SERVING:
/* handle http headers coming in */
/* pending truncated sends have uber priority */
if (wsi->truncated_send_len) {
if (pollfd->revents & LWS_POLLOUT)
if (lws_issue_raw(wsi, wsi->truncated_send_malloc +
wsi->truncated_send_offset,
wsi->truncated_send_len) < 0) {
goto fail;
}
/*
* we can't afford to allow input processing send
* something new, so spin around he event loop until
* he doesn't have any partials
*/
break;
}
/* any incoming data ready? */
if (pollfd->revents & LWS_POLLIN) {
len = lws_ssl_capable_read(context, wsi,
context->service_buffer,
sizeof(context->service_buffer));
lwsl_debug("%s: read %d\r\n", __func__, len);
switch (len) {
case 0:
lwsl_info("lws_server_skt_srv: read 0 len\n");
/* lwsl_info(" state=%d\n", wsi->state); */
if (!wsi->hdr_parsing_completed)
lws_free_header_table(wsi);
/* fallthru */
case LWS_SSL_CAPABLE_ERROR:
goto fail;
case LWS_SSL_CAPABLE_MORE_SERVICE:
goto try_pollout;
}
/* just ignore incoming if waiting for close */
if (wsi->state != WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
/*
* hm this may want to send
* (via HTTP callback for example)
*/
n = lws_read(context, wsi,
context->service_buffer, len);
if (n < 0) /* we closed wsi */
return 1;
/* hum he may have used up the
* writability above */
break;
}
}
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))
goto fail;
lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_WRITE);
if (wsi->state != WSI_STATE_HTTP_ISSUING_FILE) {
n = user_callback_handle_rxflow(
wsi->protocol->callback,
wsi->protocol->owning_server,
wsi, LWS_CALLBACK_HTTP_WRITEABLE,
wsi->user_space,
NULL,
0);
if (n < 0)
goto fail;
break;
}
/* >0 == completion, <0 == error */
n = lws_serve_http_file_fragment(context, wsi);
if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi)))
goto fail;
break;
case LWS_CONNMODE_SERVER_LISTENER:
#if LWS_POSIX
/* pollin means a client has connected to us then */
if (!(pollfd->revents & LWS_POLLIN))
break;
/* listen socket got an unencrypted connection... */
clilen = sizeof(cli_addr);
lws_latency_pre(context, wsi);
accept_fd = accept(pollfd->fd, (struct sockaddr *)&cli_addr,
&clilen);
lws_latency(context, wsi,
"unencrypted accept LWS_CONNMODE_SERVER_LISTENER",
accept_fd, accept_fd >= 0);
if (accept_fd < 0) {
if (LWS_ERRNO == LWS_EAGAIN ||
LWS_ERRNO == LWS_EWOULDBLOCK) {
lwsl_debug("accept asks to try again\n");
break;
}
lwsl_warn("ERROR on accept: %s\n", strerror(LWS_ERRNO));
break;
}
lws_plat_set_socket_options(context, accept_fd);
#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 ((context->protocols[0].callback)(context, wsi,
LWS_CALLBACK_FILTER_NETWORK_CONNECTION,
NULL, (void *)(long)accept_fd, 0)) {
lwsl_debug("Callback denied network connection\n");
compatible_close(accept_fd);
break;
}
new_wsi = lws_create_new_server_wsi(context);
if (new_wsi == NULL) {
compatible_close(accept_fd);
break;
}
new_wsi->sock = accept_fd;
/* the transport is accepted... give him time to negotiate */
lws_set_timeout(new_wsi, PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
AWAITING_TIMEOUT);
#if LWS_POSIX == 0
mbed3_tcp_stream_accept(accept_fd, new_wsi);
#endif
/*
* 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 protocols[0]
*/
(context->protocols[0].callback)(context, new_wsi,
LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED,
NULL, NULL, 0);
lws_libev_accept(context, new_wsi, accept_fd);
if (!LWS_SSL_ENABLED(context)) {
#if LWS_POSIX
lwsl_debug("accepted new conn port %u on fd=%d\n",
ntohs(cli_addr.sin_port), accept_fd);
#endif
if (insert_wsi_socket_into_fds(context, new_wsi))
goto fail;
}
break;
default:
break;
}
if (!lws_server_socket_service_ssl(context, &wsi, new_wsi, accept_fd,
pollfd))
return 0;
fail:
lws_close_and_free_session(context, wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 1;
}
int
lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
{
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;
int protocol_len, n, hit;
char protocol_list[128];
char protocol_name[32];
char *p;
assert(len < 10000000);
assert(wsi->u.hdr.ah);
while (len--) {
wsi->more_rx_waiting = !!len;
if (wsi->mode != LWSCM_HTTP_SERVING &&
wsi->mode != LWSCM_HTTP_SERVING_ACCEPTED) {
lwsl_err("%s: bad wsi mode %d\n", __func__, wsi->mode);
goto bail_nuke_ah;
}
if (lws_parse(wsi, *(*buf)++)) {
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;
}
wsi->vhost->trans++;
if (!wsi->conn_stat_done) {
wsi->vhost->conn++;
wsi->conn_stat_done = 1;
}
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->ws_upgrades++;
lwsl_info("Upgrade to ws\n");
goto upgrade_ws;
}
#ifdef LWS_USE_HTTP2
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"h2c")) {
wsi->vhost->http2_upgrades++;
lwsl_info("Upgrade to h2c\n");
goto upgrade_h2c;
}
#endif
lwsl_err("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.fd = LWS_INVALID_FILE;
/* 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_USE_HTTP2
upgrade_h2c:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
lwsl_err("missing http2_settings\n");
goto bail_nuke_ah;
}
lwsl_err("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;
lws_http2_init(&wsi->u.http2.peer_settings);
lws_http2_init(&wsi->u.http2.my_settings);
/* HTTP2 union */
lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
(unsigned char *)protocol_list, n);
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;
while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
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) {
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_err("No protocol from \"%s\" supported\n",
protocol_list);
goto bail_nuke_ah;
}
/*
* some clients only have one protocol and
* do not sent the protocol list header...
* allow it and match to protocol 0
*/
lwsl_info("defaulting to prot 0 handler\n");
n = 0;
wsi->protocol = &wsi->vhost->protocols[0];
}
/* 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;
}
/*
* stitch protocol choice into the vh protocol linked list
*/
wsi->same_vh_protocol_prev = /* guy who points to us */
&wsi->vhost->same_vh_protocol_list[n];
wsi->same_vh_protocol_next = /* old first guy is our next */
wsi->vhost->same_vh_protocol_list[n];
/* we become the new first guy */
wsi->vhost->same_vh_protocol_list[n] = wsi;
/*
* 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_warn("Unknown client spec version %d\n",
wsi->ietf_spec_revision);
goto bail_nuke_ah;
}
/* 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 ah in ws mode (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);
/*
* 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 = LWS_MAX_SOCKET_IO_BUF;
n += LWS_PRE;
wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
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_info("Allocating RX buffer %d\n", n);
#if LWS_POSIX
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF,
(const char *)&n, sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
return 1;
}
#endif
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
return 0;
} /* while all chars are handled */
return 0;
bail_nuke_ah:
/* drop the header info */
/* we're closing, losing some rx is OK */
wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
lws_header_table_detach(wsi, 1);
return 1;
}
int
lws_context_init_server(struct lws_context_creation_info *info,
struct lws_context *context)
{
#ifdef LWS_POSIX
int n, opt = 1, limit = 1;
#endif
lws_sockfd_type sockfd;
struct lws *wsi;
int m = 0;
/* set up our external listening socket we serve on */
if (info->port == CONTEXT_PORT_NO_LISTEN)
return 0;
#if LWS_POSIX
#if defined(__linux__)
limit = context->count_threads;
#endif
for (m = 0; m < limit; m++) {
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context))
sockfd = socket(AF_INET6, SOCK_STREAM, 0);
else
#endif
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd == -1) {
#else
sockfd = mbed3_create_tcp_stream_socket();
if (!lws_sockfd_valid(sockfd)) {
#endif
lwsl_err("ERROR opening socket\n");
return 1;
}
#if LWS_POSIX
/*
* allow us to restart even if old sockets in TIME_WAIT
*/
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR,
(const void *)&opt, sizeof(opt)) < 0) {
compatible_close(sockfd);
return 1;
}
#if defined(__linux__) && defined(SO_REUSEPORT) && LWS_MAX_SMP > 1
if (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(context, sockfd);
#if LWS_POSIX
n = lws_socket_bind(context, sockfd, info->port, info->iface);
if (n < 0)
goto bail;
info->port = n;
#endif
context->listen_port = info->port;
wsi = lws_zalloc(sizeof(struct lws));
if (wsi == NULL) {
lwsl_err("Out of mem\n");
goto bail;
}
wsi->context = context;
wsi->sock = sockfd;
wsi->mode = LWSCM_SERVER_LISTENER;
wsi->protocol = context->protocols;
wsi->tsi = m;
context->pt[m].wsi_listening = wsi;
if (insert_wsi_socket_into_fds(context, wsi))
goto bail;
context->count_wsi_allocated++;
context->pt[m].lserv_fd = sockfd;
#if LWS_POSIX
listen(wsi->sock, LWS_SOMAXCONN);
} /* for each thread able to independently lister */
#else
mbed3_tcp_stream_bind(wsi->sock, info->port, wsi);
#endif
lwsl_notice(" Listening on port %d\n", info->port);
return 0;
bail:
compatible_close(sockfd);
return 1;
}
int
_lws_server_listen_accept_flow_control(struct lws *twsi, int on)
{
struct lws_context_per_thread *pt = &twsi->context->pt[(int)twsi->tsi];
struct lws *wsi = pt->wsi_listening;
int n;
if (!wsi || twsi->context->being_destroyed)
return 0;
lwsl_debug("%s: Thr %d: LISTEN wsi %p: state %d\n",
__func__, twsi->tsi, (void *)wsi, on);
if (on)
n = lws_change_pollfd(wsi, 0, LWS_POLLIN);
else
n = lws_change_pollfd(wsi, LWS_POLLIN, 0);
return n;
}
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];
unsigned int n, count = 0;
char http_version_str[10];
char http_conn_str[20];
int http_version_len;
char *uri_ptr = NULL;
int uri_len = 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,
#ifdef LWS_USE_HTTP2
WSI_TOKEN_HTTP_COLON_PATH,
#endif
};
#ifdef _DEBUG
static const char * const method_names[] = {
"GET", "POST", "OPTIONS", "PUT", "PATCH", "DELETE",
#ifdef LWS_USE_HTTP2
":path",
#endif
};
#endif
/* it's not websocket.... shall we accept it as http? */
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");
goto bail_nuke_ah;
}
if (count != 1) {
lwsl_warn("multiple methods?\n");
goto bail_nuke_ah;
}
if (lws_ensure_user_space(wsi))
goto bail_nuke_ah;
for (n = 0; n < ARRAY_SIZE(methods); n++)
if (lws_hdr_total_length(wsi, methods[n])) {
uri_ptr = lws_hdr_simple_ptr(wsi, methods[n]);
uri_len = lws_hdr_total_length(wsi, methods[n]);
lwsl_info("Method: %s request for '%s'\n",
method_names[n], uri_ptr);
break;
}
/* HTTP header had a content length? */
wsi->u.http.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.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.content_length = atoi(content_length_str);
}
/* 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);
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;
if (lws_add_http_header_status(wsi, 301, &p, end))
goto bail_nuke_ah;
n = sprintf((char *)end, "https://%s/",
lws_hdr_simple_ptr(wsi, WSI_TOKEN_HOST));
if (lws_add_http_header_by_token(wsi, WSI_TOKEN_HTTP_LOCATION,
end, n, &p, end))
goto bail_nuke_ah;
if (lws_finalize_http_header(wsi, &p, end))
goto bail_nuke_ah;
n = lws_write(wsi, start, p - start, LWS_WRITE_HTTP_HEADERS);
if (n < 0)
goto bail_nuke_ah;
return lws_http_transaction_completed(wsi);
}
n = wsi->protocol->callback(wsi, LWS_CALLBACK_HTTP,
wsi->user_space, uri_ptr, uri_len);
if (n) {
lwsl_info("LWS_CALLBACK_HTTP closing\n");
return 1;
}
/*
* 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: */
if (wsi->u.http.content_length > 0)
wsi->state = LWSS_HTTP_BODY;
return 0;
bail_nuke_ah:
/* we're closing, losing some rx is OK */
wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
lws_header_table_detach(wsi, 1);
return 1;
}
int
lws_handshake_server(struct lws *wsi, unsigned char **buf, size_t len)
{
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;
int protocol_len, n, hit;
char protocol_list[128];
char protocol_name[32];
char *p;
assert(len < 10000000);
assert(wsi->u.hdr.ah);
while (len--) {
wsi->more_rx_waiting = !!len;
assert(wsi->mode == LWSCM_HTTP_SERVING);
if (lws_parse(wsi, *(*buf)++)) {
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);
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")) {
lwsl_info("Upgrade to ws\n");
goto upgrade_ws;
}
#ifdef LWS_USE_HTTP2
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"h2c-14")) {
lwsl_info("Upgrade to h2c-14\n");
goto upgrade_h2c;
}
#endif
lwsl_err("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.fd = LWS_INVALID_FILE;
/* 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_USE_HTTP2
upgrade_h2c:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
lwsl_err("missing http2_settings\n");
goto bail_nuke_ah;
}
lwsl_err("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;
lws_http2_init(&wsi->u.http2.peer_settings);
lws_http2_init(&wsi->u.http2.my_settings);
/* HTTP2 union */
lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings,
(unsigned char *)protocol_list, n);
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) {
unsigned int n = 0;
while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
protocol_name[n++] = *p++;
protocol_name[n] = '\0';
if (*p)
p++;
lwsl_info("checking %s\n", protocol_name);
n = 0;
while (context->protocols[n].callback) {
if (context->protocols[n].name &&
!strcmp(context->protocols[n].name,
protocol_name)) {
lwsl_info("prot match %d\n", n);
wsi->protocol = &context->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_err("No protocol from \"%s\" supported\n",
protocol_list);
goto bail_nuke_ah;
}
/*
* some clients only have one protocol and
* do not sent the protocol list header...
* allow it and match to protocol 0
*/
lwsl_info("defaulting to prot 0 handler\n");
wsi->protocol = &context->protocols[0];
}
/* 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_warn("Unknown client spec version %d\n",
wsi->ietf_spec_revision);
goto bail_nuke_ah;
}
/* 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 ah in ws mode (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);
/*
* 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 = LWS_MAX_SOCKET_IO_BUF;
n += LWS_PRE;
wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
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_info("Allocating RX buffer %d\n", n);
#if LWS_POSIX
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF,
(const char *)&n, sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
return 1;
}
#endif
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
return 0;
} /* while all chars are handled */
return 0;
bail_nuke_ah:
/* drop the header info */
/* we're closing, losing some rx is OK */
wsi->u.hdr.ah->rxpos = wsi->u.hdr.ah->rxlen;
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;
}
int
lws_client_interpret_server_handshake(struct lws *wsi)
{
int n, len, okay = 0, port = 0, ssl = 0;
int close_reason = LWS_CLOSE_STATUS_PROTOCOL_ERR;
struct lws_context *context = wsi->context;
const char *pc, *prot, *ads = NULL, *path, *cce = NULL;
struct allocated_headers *ah = NULL;
char *p, *q;
char new_path[300];
#ifndef LWS_NO_EXTENSIONS
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
char *sb = (char *)&pt->serv_buf[0];
const struct lws_ext_options *opts;
const struct lws_extension *ext;
char ext_name[128];
const char *c, *a;
char ignore;
int more = 1;
void *v;
#endif
ah = wsi->u.hdr.ah;
if (!wsi->do_ws) {
/* we are being an http client...
*/
lws_union_transition(wsi, LWSCM_HTTP_CLIENT_ACCEPTED);
wsi->state = LWSS_CLIENT_HTTP_ESTABLISHED;
wsi->u.http.ah = ah;
ah->http_response = 0;
}
/*
* well, what the server sent looked reasonable for syntax.
* Now let's confirm it sent all the necessary headers
*
* http (non-ws) client will expect something like this
*
* HTTP/1.0.200
* server:.libwebsockets
* content-type:.text/html
* content-length:.17703
* set-cookie:.test=LWS_1456736240_336776_COOKIE;Max-Age=360000
*
*
*
*/
wsi->u.http.connection_type = HTTP_CONNECTION_KEEP_ALIVE;
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP);
if (wsi->do_ws && !p) {
lwsl_info("no URI\n");
cce = "HS: URI missing";
goto bail3;
}
if (!p) {
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP1_0);
wsi->u.http.connection_type = HTTP_CONNECTION_CLOSE;
}
if (!p) {
cce = "HS: URI missing";
lwsl_info("no URI\n");
goto bail3;
}
n = atoi(p);
if (ah)
ah->http_response = n;
if (n == 301 || n == 302 || n == 303 || n == 307 || n == 308) {
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_LOCATION);
if (!p) {
cce = "HS: Redirect code but no Location";
goto bail3;
}
/* Relative reference absolute path */
if (p[0] == '/')
{
#ifdef LWS_OPENSSL_SUPPORT
ssl = wsi->use_ssl;
#endif
ads = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS);
port = wsi->c_port;
path = p + 1; /* +1 as lws_client_reset expects leading / to be omitted */
}
/* Absolute (Full) URI */
else if (strchr(p, ':'))
{
if (lws_parse_uri(p, &prot, &ads, &port, &path)) {
cce = "HS: URI did not parse";
goto bail3;
}
if (!strcmp(prot, "wss") || !strcmp(prot, "https"))
ssl = 1;
}
/* Relative reference relative path */
else
{
/* This doesn't try to calculate an absolute path, that will be left to the server */
#ifdef LWS_OPENSSL_SUPPORT
ssl = wsi->use_ssl;
#endif
ads = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS);
port = wsi->c_port;
path = new_path + 1; /* +1 as lws_client_reset expects leading / to be omitted */
strncpy(new_path, lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_URI), sizeof(new_path));
new_path[sizeof(new_path) - 1] = '\0';
q = strrchr(new_path, '/');
if (q)
{
strncpy(q + 1, p, sizeof(new_path) - (q - new_path) - 1);
new_path[sizeof(new_path) - 1] = '\0';
}
else
{
path = p;
}
}
#ifdef LWS_OPENSSL_SUPPORT
if (wsi->use_ssl && !ssl) {
cce = "HS: Redirect attempted SSL downgrade";
goto bail3;
}
#endif
if (!lws_client_reset(&wsi, ssl, ads, port, path, ads)) {
/* there are two ways to fail out with NULL return...
* simple, early problem where the wsi is intact, or
* we went through with the reconnect attempt and the
* wsi is already closed. In the latter case, the wsi
* has beet set to NULL additionally.
*/
lwsl_err("Redirect failed\n");
cce = "HS: Redirect failed";
if (wsi)
goto bail3;
return 1;
}
return 0;
}
if (!wsi->do_ws) {
if (n != 200 && n != 201 && n != 304 && n != 401) {
lwsl_notice("Connection failed with code %d\n", n);
cce = "HS: Server unrecognized response code";
goto bail2;
}
#ifdef LWS_WITH_HTTP_PROXY
wsi->perform_rewrite = 0;
if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE)) {
if (!strncmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_HTTP_CONTENT_TYPE),
"text/html", 9))
wsi->perform_rewrite = 1;
}
#endif
/* allocate the per-connection user memory (if any) */
if (lws_ensure_user_space(wsi)) {
lwsl_err("Problem allocating wsi user mem\n");
cce = "HS: OOM";
goto bail2;
}
/* he may choose to send us stuff in chunked transfer-coding */
wsi->chunked = 0;
wsi->chunk_remaining = 0; /* ie, next thing is chunk size */
if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_TRANSFER_ENCODING)) {
wsi->chunked = !strcmp(lws_hdr_simple_ptr(wsi,
WSI_TOKEN_HTTP_TRANSFER_ENCODING),
"chunked");
/* first thing is hex, after payload there is crlf */
wsi->chunk_parser = ELCP_HEX;
}
if (lws_hdr_total_length(wsi, WSI_TOKEN_HTTP_CONTENT_LENGTH)) {
wsi->u.http.content_length =
atoll(lws_hdr_simple_ptr(wsi,
WSI_TOKEN_HTTP_CONTENT_LENGTH));
lwsl_notice("%s: incoming content length %llu\n", __func__,
(unsigned long long)wsi->u.http.content_length);
wsi->u.http.content_remain = wsi->u.http.content_length;
} else /* can't do 1.1 without a content length or chunked */
if (!wsi->chunked)
wsi->u.http.connection_type = HTTP_CONNECTION_CLOSE;
/*
* we seem to be good to go, give client last chance to check
* headers and OK it
*/
if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH,
wsi->user_space, NULL, 0)) {
cce = "HS: disallowed by client filter";
goto bail2;
}
/* clear his proxy connection timeout */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/* call him back to inform him he is up */
if (wsi->protocol->callback(wsi,
LWS_CALLBACK_ESTABLISHED_CLIENT_HTTP,
wsi->user_space, NULL, 0)) {
cce = "HS: disallowed at ESTABLISHED";
goto bail3;
}
/* free up his parsing allocations */
lws_header_table_detach(wsi, 0);
lwsl_notice("%s: client connection up\n", __func__);
return 0;
}
if (lws_hdr_total_length(wsi, WSI_TOKEN_ACCEPT) == 0) {
lwsl_info("no ACCEPT\n");
cce = "HS: ACCEPT missing";
goto bail3;
}
if (p && strncmp(p, "101", 3)) {
lwsl_warn(
"lws_client_handshake: got bad HTTP response '%s'\n", p);
cce = "HS: ws upgrade response not 101";
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE);
if (!p) {
lwsl_info("no UPGRADE\n");
cce = "HS: UPGRADE missing";
goto bail3;
}
strtolower(p);
if (strcmp(p, "websocket")) {
lwsl_warn(
"lws_client_handshake: got bad Upgrade header '%s'\n", p);
cce = "HS: Upgrade to something other than websocket";
goto bail3;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_CONNECTION);
if (!p) {
lwsl_info("no Connection hdr\n");
cce = "HS: CONNECTION missing";
goto bail3;
}
strtolower(p);
if (strcmp(p, "upgrade")) {
lwsl_warn("lws_client_int_s_hs: bad header %s\n", p);
cce = "HS: UPGRADE malformed";
goto bail3;
}
pc = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_SENT_PROTOCOLS);
if (!pc) {
lwsl_parser("lws_client_int_s_hs: no protocol list\n");
} else
lwsl_parser("lws_client_int_s_hs: protocol list '%s'\n", pc);
/*
* confirm the protocol the server wants to talk was in the list
* of protocols we offered
*/
len = lws_hdr_total_length(wsi, WSI_TOKEN_PROTOCOL);
if (!len) {
lwsl_info("lws_client_int_s_hs: WSI_TOKEN_PROTOCOL is null\n");
/*
* no protocol name to work from,
* default to first protocol
*/
n = 0;
wsi->protocol = &wsi->vhost->protocols[0];
goto check_extensions;
}
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_PROTOCOL);
len = strlen(p);
while (pc && *pc && !okay) {
if (!strncmp(pc, p, len) &&
(pc[len] == ',' || pc[len] == '\0')) {
okay = 1;
continue;
}
while (*pc && *pc++ != ',')
;
while (*pc && *pc == ' ')
pc++;
}
if (!okay) {
lwsl_err("lws_client_int_s_hs: got bad protocol %s\n", p);
cce = "HS: PROTOCOL malformed";
goto bail2;
}
/*
* identify the selected protocol struct and set it
*/
n = 0;
wsi->protocol = NULL;
while (wsi->vhost->protocols[n].callback && !wsi->protocol) {
if (strcmp(p, wsi->vhost->protocols[n].name) == 0) {
wsi->protocol = &wsi->vhost->protocols[n];
break;
}
n++;
}
if (wsi->protocol == NULL) {
lwsl_err("lws_client_int_s_hs: fail protocol %s\n", p);
cce = "HS: Cannot match protocol";
goto bail2;
}
check_extensions:
/*
* stitch protocol choice into the vh protocol linked list
* We always insert ourselves at the start of the list
*
* X <-> B
* X <-> pAn <-> pB
*/
//lwsl_err("%s: pre insert vhost start wsi %p, that wsi prev == %p\n",
// __func__,
// wsi->vhost->same_vh_protocol_list[n],
// wsi->same_vh_protocol_prev);
wsi->same_vh_protocol_prev = /* guy who points to us */
&wsi->vhost->same_vh_protocol_list[n];
wsi->same_vh_protocol_next = /* old first guy is our next */
wsi->vhost->same_vh_protocol_list[n];
/* we become the new first guy */
wsi->vhost->same_vh_protocol_list[n] = wsi;
if (wsi->same_vh_protocol_next)
/* old first guy points back to us now */
wsi->same_vh_protocol_next->same_vh_protocol_prev =
&wsi->same_vh_protocol_next;
#ifndef LWS_NO_EXTENSIONS
/* instantiate the accepted extensions */
if (!lws_hdr_total_length(wsi, WSI_TOKEN_EXTENSIONS)) {
lwsl_ext("no client extensions allowed by server\n");
goto check_accept;
}
/*
* break down the list of server accepted extensions
* and go through matching them or identifying bogons
*/
if (lws_hdr_copy(wsi, sb, context->pt_serv_buf_size, WSI_TOKEN_EXTENSIONS) < 0) {
lwsl_warn("ext list from server failed to copy\n");
cce = "HS: EXT: list too big";
goto bail2;
}
c = sb;
n = 0;
ignore = 0;
a = NULL;
while (more) {
if (*c && (*c != ',' && *c != '\t')) {
if (*c == ';') {
ignore = 1;
if (!a)
a = c + 1;
}
if (ignore || *c == ' ') {
c++;
continue;
}
ext_name[n] = *c++;
if (n < sizeof(ext_name) - 1)
n++;
continue;
}
ext_name[n] = '\0';
ignore = 0;
if (!*c)
more = 0;
else {
c++;
if (!n)
continue;
}
/* check we actually support it */
lwsl_notice("checking client ext %s\n", ext_name);
n = 0;
ext = wsi->vhost->extensions;
while (ext && ext->callback) {
if (strcmp(ext_name, ext->name)) {
ext++;
continue;
}
n = 1;
lwsl_notice("instantiating client ext %s\n", ext_name);
/* instantiate the extension on this conn */
wsi->active_extensions[wsi->count_act_ext] = ext;
/* allow him to construct his ext instance */
if (ext->callback(lws_get_context(wsi), ext, wsi,
LWS_EXT_CB_CLIENT_CONSTRUCT,
(void *)&wsi->act_ext_user[wsi->count_act_ext],
(void *)&opts, 0)) {
lwsl_notice(" ext %s failed construction\n", ext_name);
ext++;
continue;
}
/*
* allow the user code to override ext defaults if it
* wants to
*/
ext_name[0] = '\0';
if (user_callback_handle_rxflow(wsi->protocol->callback,
wsi, LWS_CALLBACK_WS_EXT_DEFAULTS,
(char *)ext->name, ext_name,
sizeof(ext_name))) {
cce = "HS: EXT: failed setting defaults";
goto bail2;
}
if (ext_name[0] &&
lws_ext_parse_options(ext, wsi, wsi->act_ext_user[
wsi->count_act_ext], opts, ext_name,
strlen(ext_name))) {
lwsl_err("%s: unable to parse user defaults '%s'",
__func__, ext_name);
cce = "HS: EXT: failed parsing defaults";
goto bail2;
}
/*
* give the extension the server options
*/
if (a && lws_ext_parse_options(ext, wsi,
wsi->act_ext_user[wsi->count_act_ext],
opts, a, c - a)) {
lwsl_err("%s: unable to parse remote def '%s'",
__func__, a);
cce = "HS: EXT: failed parsing options";
goto bail2;
}
if (ext->callback(lws_get_context(wsi), ext, wsi,
LWS_EXT_CB_OPTION_CONFIRM,
wsi->act_ext_user[wsi->count_act_ext],
NULL, 0)) {
lwsl_err("%s: ext %s rejects server options %s",
__func__, ext->name, a);
cce = "HS: EXT: Rejects server options";
goto bail2;
}
wsi->count_act_ext++;
ext++;
}
if (n == 0) {
lwsl_warn("Unknown ext '%s'!\n", ext_name);
cce = "HS: EXT: unknown ext";
goto bail2;
}
a = NULL;
n = 0;
}
check_accept:
#endif
/*
* Confirm his accept token is the one we precomputed
*/
p = lws_hdr_simple_ptr(wsi, WSI_TOKEN_ACCEPT);
if (strcmp(p, wsi->u.hdr.ah->initial_handshake_hash_base64)) {
lwsl_warn("lws_client_int_s_hs: accept '%s' wrong vs '%s'\n", p,
wsi->u.hdr.ah->initial_handshake_hash_base64);
cce = "HS: Accept hash wrong";
goto bail2;
}
/* allocate the per-connection user memory (if any) */
if (lws_ensure_user_space(wsi)) {
lwsl_err("Problem allocating wsi user mem\n");
cce = "HS: OOM";
goto bail2;
}
/*
* we seem to be good to go, give client last chance to check
* headers and OK it
*/
if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_FILTER_PRE_ESTABLISH,
wsi->user_space, NULL, 0)) {
cce = "HS: Rejected by filter cb";
goto bail2;
}
/* clear his proxy connection timeout */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
/* free up his parsing allocations */
lws_header_table_detach(wsi, 0);
lws_union_transition(wsi, LWSCM_WS_CLIENT);
wsi->state = LWSS_ESTABLISHED;
lws_restart_ws_ping_pong_timer(wsi);
wsi->rxflow_change_to = LWS_RXFLOW_ALLOW;
/*
* create the frame buffer for this connection according to the
* size mentioned in the protocol definition. If 0 there, then
* use a big default for compatibility
*/
n = wsi->protocol->rx_buffer_size;
if (!n)
n = context->pt_serv_buf_size;
n += LWS_PRE;
wsi->u.ws.rx_ubuf = lws_malloc(n + 4 /* 0x0000ffff zlib */);
if (!wsi->u.ws.rx_ubuf) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
cce = "HS: OOM";
goto bail2;
}
wsi->u.ws.rx_ubuf_alloc = n;
lwsl_info("Allocating client RX buffer %d\n", n);
#if !defined(LWS_WITH_ESP32)
if (setsockopt(wsi->desc.sockfd, SOL_SOCKET, SO_SNDBUF, (const char *)&n,
sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
cce = "HS: SO_SNDBUF failed";
goto bail3;
}
#endif
lwsl_debug("handshake OK for protocol %s\n", wsi->protocol->name);
/* call him back to inform him he is up */
if (wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_ESTABLISHED,
wsi->user_space, NULL, 0)) {
cce = "HS: Rejected at CLIENT_ESTABLISHED";
goto bail3;
}
#ifndef LWS_NO_EXTENSIONS
/*
* inform all extensions, not just active ones since they
* already know
*/
ext = wsi->vhost->extensions;
while (ext && ext->callback) {
v = NULL;
for (n = 0; n < wsi->count_act_ext; n++)
if (wsi->active_extensions[n] == ext)
v = wsi->act_ext_user[n];
ext->callback(context, ext, wsi,
LWS_EXT_CB_ANY_WSI_ESTABLISHED, v, NULL, 0);
ext++;
}
#endif
return 0;
bail3:
close_reason = LWS_CLOSE_STATUS_NOSTATUS;
bail2:
if (wsi->protocol)
wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_CONNECTION_ERROR,
wsi->user_space, (void *)cce,
(unsigned int)strlen(cce));
wsi->already_did_cce = 1;
lwsl_info("closing connection due to bail2 connection error\n");
/* closing will free up his parsing allocations */
lws_close_free_wsi(wsi, close_reason);
return 1;
}
char *
lws_generate_client_handshake(struct lws *wsi, char *pkt)
{
char buf[128], hash[20], key_b64[40], *p = pkt;
struct lws_context *context = wsi->context;
const char *meth;
int n;
#ifndef LWS_NO_EXTENSIONS
const struct lws_extension *ext;
int ext_count = 0;
#endif
const char *pp = lws_hdr_simple_ptr(wsi,
_WSI_TOKEN_CLIENT_SENT_PROTOCOLS);
meth = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_METHOD);
if (!meth) {
meth = "GET";
wsi->do_ws = 1;
} else {
wsi->do_ws = 0;
}
if (!strcmp(meth, "RAW")) {
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
lwsl_notice("client transition to raw\n");
if (pp) {
const struct lws_protocols *pr;
pr = lws_vhost_name_to_protocol(wsi->vhost, pp);
if (!pr) {
lwsl_err("protocol %s not enabled on vhost\n",
pp);
return NULL;
}
lws_bind_protocol(wsi, pr);
}
if ((wsi->protocol->callback)(wsi,
LWS_CALLBACK_RAW_ADOPT,
wsi->user_space, NULL, 0))
return NULL;
lws_header_table_force_to_detachable_state(wsi);
lws_union_transition(wsi, LWSCM_RAW);
lws_header_table_detach(wsi, 1);
return NULL;
}
if (wsi->do_ws) {
/*
* create the random key
*/
n = lws_get_random(context, hash, 16);
if (n != 16) {
lwsl_err("Unable to read from random dev %s\n",
SYSTEM_RANDOM_FILEPATH);
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return NULL;
}
lws_b64_encode_string(hash, 16, key_b64, sizeof(key_b64));
}
/*
* 04 example client handshake
*
* GET /chat HTTP/1.1
* Host: server.example.com
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
* Sec-WebSocket-Origin: http://example.com
* Sec-WebSocket-Protocol: chat, superchat
* Sec-WebSocket-Version: 4
*/
p += sprintf(p, "%s %s HTTP/1.1\x0d\x0a", meth,
lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_URI));
p += sprintf(p, "Pragma: no-cache\x0d\x0a"
"Cache-Control: no-cache\x0d\x0a");
p += sprintf(p, "Host: %s\x0d\x0a",
lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_HOST));
if (lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_ORIGIN)) {
if (lws_check_opt(context->options, LWS_SERVER_OPTION_JUST_USE_RAW_ORIGIN))
p += sprintf(p, "Origin: %s\x0d\x0a",
lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_ORIGIN));
else
p += sprintf(p, "Origin: http://%s\x0d\x0a",
lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_ORIGIN));
}
if (wsi->do_ws) {
p += sprintf(p, "Upgrade: websocket\x0d\x0a"
"Connection: Upgrade\x0d\x0a"
"Sec-WebSocket-Key: ");
strcpy(p, key_b64);
p += strlen(key_b64);
p += sprintf(p, "\x0d\x0a");
if (lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_SENT_PROTOCOLS))
p += sprintf(p, "Sec-WebSocket-Protocol: %s\x0d\x0a",
lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_SENT_PROTOCOLS));
/* tell the server what extensions we could support */
#ifndef LWS_NO_EXTENSIONS
ext = wsi->vhost->extensions;
while (ext && ext->callback) {
n = lws_ext_cb_all_exts(context, wsi,
LWS_EXT_CB_CHECK_OK_TO_PROPOSE_EXTENSION,
(char *)ext->name, 0);
if (n) { /* an extension vetos us */
lwsl_ext("ext %s vetoed\n", (char *)ext->name);
ext++;
continue;
}
n = wsi->vhost->protocols[0].callback(wsi,
LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED,
wsi->user_space, (char *)ext->name, 0);
/*
* zero return from callback means
* go ahead and allow the extension,
* it's what we get if the callback is
* unhandled
*/
if (n) {
ext++;
continue;
}
/* apply it */
if (ext_count)
*p++ = ',';
else
p += sprintf(p, "Sec-WebSocket-Extensions: ");
p += sprintf(p, "%s", ext->client_offer);
ext_count++;
ext++;
}
if (ext_count)
p += sprintf(p, "\x0d\x0a");
#endif
if (wsi->ietf_spec_revision)
p += sprintf(p, "Sec-WebSocket-Version: %d\x0d\x0a",
wsi->ietf_spec_revision);
/* prepare the expected server accept response */
key_b64[39] = '\0'; /* enforce composed length below buf sizeof */
n = sprintf(buf, "%s258EAFA5-E914-47DA-95CA-C5AB0DC85B11", key_b64);
lws_SHA1((unsigned char *)buf, n, (unsigned char *)hash);
lws_b64_encode_string(hash, 20,
wsi->u.hdr.ah->initial_handshake_hash_base64,
sizeof(wsi->u.hdr.ah->initial_handshake_hash_base64));
}
/* give userland a chance to append, eg, cookies */
wsi->protocol->callback(wsi, LWS_CALLBACK_CLIENT_APPEND_HANDSHAKE_HEADER,
wsi->user_space, &p, (pkt + context->pt_serv_buf_size) - p - 12);
p += sprintf(p, "\x0d\x0a");
return p;
}
int lws_handshake_server(struct libwebsocket_context *context,
struct libwebsocket *wsi, unsigned char **buf, size_t len)
{
struct allocated_headers *ah;
int protocol_len;
char protocol_list[128];
char protocol_name[32];
char *p;
int n, hit;
/* LWS_CONNMODE_WS_SERVING */
while (len--) {
if (libwebsocket_parse(context, wsi, *(*buf)++)) {
lwsl_info("libwebsocket_parse failed\n");
goto bail_nuke_ah;
}
if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
continue;
lwsl_parser("libwebsocket_parse sees parsing complete\n");
wsi->mode = LWS_CONNMODE_PRE_WS_SERVING_ACCEPT;
libwebsocket_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) ||
!lws_hdr_total_length(wsi, WSI_TOKEN_CONNECTION)) {
ah = wsi->u.hdr.ah;
lws_union_transition(wsi, LWS_CONNMODE_HTTP_SERVING_ACCEPTED);
wsi->state = WSI_STATE_HTTP;
wsi->u.http.fd = LWS_INVALID_FILE;
/* expose it at the same offset as u.hdr */
wsi->u.http.ah = ah;
n = lws_http_action(context, wsi);
return n;
}
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"websocket"))
goto upgrade_ws;
#ifdef LWS_USE_HTTP2
if (!strcasecmp(lws_hdr_simple_ptr(wsi, WSI_TOKEN_UPGRADE),
"h2c-14"))
goto upgrade_h2c;
#endif
/* dunno what he wanted to upgrade to */
goto bail_nuke_ah;
#ifdef LWS_USE_HTTP2
upgrade_h2c:
if (!lws_hdr_total_length(wsi, WSI_TOKEN_HTTP2_SETTINGS)) {
lwsl_err("missing http2_settings\n");
goto bail_nuke_ah;
}
lwsl_err("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, LWS_CONNMODE_HTTP2_SERVING);
/* http2 union member has http union struct at start */
wsi->u.http.ah = ah;
lws_http2_init(&wsi->u.http2.peer_settings);
lws_http2_init(&wsi->u.http2.my_settings);
/* HTTP2 union */
lws_http2_interpret_settings_payload(&wsi->u.http2.peer_settings, (unsigned char *)protocol_list, n);
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 = WSI_STATE_HTTP2_AWAIT_CLIENT_PREFACE;
return 0;
#endif
upgrade_ws:
if (!wsi->protocol)
lwsl_err("NULL protocol at libwebsocket_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) {
unsigned int n = 0;
while (n < sizeof(protocol_name) - 1 && *p && *p !=',')
protocol_name[n++] = *p++;
protocol_name[n] = '\0';
if (*p)
p++;
lwsl_info("checking %s\n", protocol_name);
n = 0;
while (wsi->protocol && context->protocols[n].callback) {
if (!wsi->protocol->name) {
n++;
continue;
}
if (!strcmp(context->protocols[n].name,
protocol_name)) {
lwsl_info("prot match %d\n", n);
wsi->protocol = &context->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) ==
NULL) {
/*
* some clients only have one protocol and
* do not sent the protocol list header...
* allow it and match to protocol 0
*/
lwsl_info("defaulting to prot 0 handler\n");
wsi->protocol = &context->protocols[0];
} else {
lwsl_err("No protocol from list \"%s\" supported\n",
protocol_list);
goto bail_nuke_ah;
}
}
/* allocate wsi->user storage */
if (libwebsocket_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->protocol->owning_server, 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_warn("Unknown client spec version %d\n",
wsi->ietf_spec_revision);
goto bail_nuke_ah;
}
/* drop the header info -- no bail_nuke_ah after this */
lws_free_header_table(wsi);
lws_union_transition(wsi, LWS_CONNMODE_WS_SERVING);
/*
* 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 = LWS_MAX_SOCKET_IO_BUF;
n += LWS_SEND_BUFFER_PRE_PADDING + LWS_SEND_BUFFER_POST_PADDING;
wsi->u.ws.rx_user_buffer = lws_malloc(n);
if (!wsi->u.ws.rx_user_buffer) {
lwsl_err("Out of Mem allocating rx buffer %d\n", n);
return 1;
}
lwsl_info("Allocating RX buffer %d\n", n);
#if LWS_POSIX
if (setsockopt(wsi->sock, SOL_SOCKET, SO_SNDBUF, (const char *)&n, sizeof n)) {
lwsl_warn("Failed to set SNDBUF to %d", n);
return 1;
}
#endif
lwsl_parser("accepted v%02d connection\n",
wsi->ietf_spec_revision);
} /* while all chars are handled */
return 0;
bail_nuke_ah:
/* drop the header info */
lws_free_header_table(wsi);
return 1;
}
