LWS_VISIBLE void
lws_plat_insert_socket_into_fds(struct lws_context *context,
struct lws *wsi)
{
lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
context->fds[context->fds_count++].revents = 0;
}
int
remove_wsi_socket_from_fds(struct libwebsocket_context *context,
struct libwebsocket *wsi)
{
int m;
struct libwebsocket_pollargs pa = { wsi->sock, 0, 0 };
lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
if (!--context->fds_count) {
context->protocols[0].callback(context, wsi,
LWS_CALLBACK_LOCK_POLL,
wsi->user_space, (void *) &pa, 0);
goto do_ext;
}
if (wsi->sock > context->max_fds) {
lwsl_err("Socket fd %d too high (%d)\n",
wsi->sock, context->max_fds);
return 1;
}
lwsl_info("%s: wsi=%p, sock=%d, fds pos=%d\n", __func__,
wsi, wsi->sock, wsi->position_in_fds_table);
context->protocols[0].callback(context, wsi,
LWS_CALLBACK_LOCK_POLL,
wsi->user_space, (void *)&pa, 0);
m = wsi->position_in_fds_table; /* replace the contents for this */
/* have the last guy take up the vacant slot */
context->fds[m] = context->fds[context->fds_count];
lws_plat_delete_socket_from_fds(context, wsi, m);
/*
* end guy's fds_lookup entry remains unchanged
* (still same fd pointing to same wsi)
*/
/* end guy's "position in fds table" changed */
context->lws_lookup[context->fds[context->fds_count].fd]->
position_in_fds_table = m;
/* deletion guy's lws_lookup entry needs nuking */
context->lws_lookup[wsi->sock] = NULL;
/* removed wsi has no position any more */
wsi->position_in_fds_table = -1;
do_ext:
/* remove also from external POLL support via protocol 0 */
if (wsi->sock) {
context->protocols[0].callback(context, wsi,
LWS_CALLBACK_DEL_POLL_FD, wsi->user_space,
(void *) &pa, 0);
}
context->protocols[0].callback(context, wsi,
LWS_CALLBACK_UNLOCK_POLL,
wsi->user_space, (void *) &pa, 0);
return 0;
}
int
remove_wsi_socket_from_fds(struct lws *wsi)
{
int m;
struct lws *end_wsi;
struct lws_pollargs pa = { wsi->sock, 0, 0 };
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
--pt->fds_count;
#if !defined(_WIN32) && !defined(MBED_OPERATORS)
if (wsi->sock > context->max_fds) {
lwsl_err("Socket fd %d too high (%d)\n",
wsi->sock, context->max_fds);
return 1;
}
#endif
lwsl_info("%s: wsi=%p, sock=%d, fds pos=%d\n", __func__,
wsi, wsi->sock, wsi->position_in_fds_table);
if (context->protocols[0].callback(wsi, LWS_CALLBACK_LOCK_POLL,
wsi->user_space, (void *)&pa, 1))
return -1;
m = wsi->position_in_fds_table; /* replace the contents for this */
/* have the last guy take up the vacant slot */
pt->fds[m] = pt->fds[pt->fds_count];
lws_plat_delete_socket_from_fds(context, wsi, m);
/*
* end guy's fds_lookup entry remains unchanged
* (still same fd pointing to same wsi)
*/
/* end guy's "position in fds table" changed */
end_wsi = wsi_from_fd(context, pt->fds[pt->fds_count].fd);
end_wsi->position_in_fds_table = m;
/* deletion guy's lws_lookup entry needs nuking */
delete_from_fd(context, wsi->sock);
/* removed wsi has no position any more */
wsi->position_in_fds_table = -1;
/* remove also from external POLL support via protocol 0 */
if (lws_socket_is_valid(wsi->sock)) {
if (context->protocols[0].callback(wsi, LWS_CALLBACK_DEL_POLL_FD,
wsi->user_space, (void *) &pa, 0))
return -1;
}
if (context->protocols[0].callback(wsi, LWS_CALLBACK_UNLOCK_POLL,
wsi->user_space, (void *) &pa, 1))
return -1;
return 0;
}
extern "C" LWS_VISIBLE void
lws_plat_insert_socket_into_fds(struct libwebsocket_context *context,
struct libwebsocket *wsi)
{
(void)wsi;
lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
context->fds[context->fds_count++].revents = 0;
}
LWS_VISIBLE void
lws_plat_insert_socket_into_fds(struct lws_context *context, struct lws *wsi)
{
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
lws_libuv_io(wsi, LWS_EV_START | LWS_EV_READ);
pt->fds[pt->fds_count++].revents = 0;
}
LWS_VISIBLE void
lws_plat_delete_socket_from_fds(struct lws_context *context,
struct lws *wsi, int m)
{
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
lws_libuv_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
pt->fds_count--;
}
int
lws_client_socket_service(struct lws_context *context, struct lws *wsi,
struct lws_pollfd *pollfd)
{
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
char *p = (char *)&pt->serv_buf[0];
char *sb = p;
unsigned char c;
int n, len;
switch (wsi->mode) {
case LWSCM_WSCL_WAITING_CONNECT:
/*
* we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE
* timeout protection set in client-handshake.c
*/
if (!lws_client_connect_2(wsi)) {
/* closed */
lwsl_client("closed\n");
return -1;
}
/* either still pending connection, or changed mode */
return 0;
case LWSCM_WSCL_WAITING_PROXY_REPLY:
/* handle proxy hung up on us */
if (pollfd->revents & LWS_POLLHUP) {
lwsl_warn("Proxy connection %p (fd=%d) dead\n",
(void *)wsi, pollfd->fd);
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
n = recv(wsi->sock, sb, LWS_MAX_SOCKET_IO_BUF, 0);
if (n < 0) {
if (LWS_ERRNO == LWS_EAGAIN) {
lwsl_debug("Proxy read returned EAGAIN... retrying\n");
return 0;
}
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
lwsl_err("ERROR reading from proxy socket\n");
return 0;
}
pt->serv_buf[13] = '\0';
if (strcmp(sb, "HTTP/1.0 200 ") &&
strcmp(sb, "HTTP/1.1 200 ")) {
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
lwsl_err("ERROR proxy: %s\n", sb);
return 0;
}
/* clear his proxy connection timeout */
lws_set_timeout(wsi, NO_PENDING_TIMEOUT, 0);
/* fallthru */
case LWSCM_WSCL_ISSUE_HANDSHAKE:
/*
* we are under PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE
* timeout protection set in client-handshake.c
*
* take care of our lws_callback_on_writable
* happening at a time when there's no real connection yet
*/
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
return -1;
lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
#ifdef LWS_OPENSSL_SUPPORT
/* we can retry this... just cook the SSL BIO the first time */
if (wsi->use_ssl && !wsi->ssl) {
#if defined(CYASSL_SNI_HOST_NAME) || defined(WOLFSSL_SNI_HOST_NAME) || defined(SSL_CTRL_SET_TLSEXT_HOSTNAME)
const char *hostname = lws_hdr_simple_ptr(wsi,
_WSI_TOKEN_CLIENT_HOST);
#endif
wsi->ssl = SSL_new(context->ssl_client_ctx);
#ifndef USE_WOLFSSL
SSL_set_mode(wsi->ssl,
SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
#endif
/*
* use server name indication (SNI), if supported,
* when establishing connection
*/
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
#ifdef CYASSL_SNI_HOST_NAME
CyaSSL_UseSNI(wsi->ssl, CYASSL_SNI_HOST_NAME,
hostname, strlen(hostname));
#endif
#else
#ifdef WOLFSSL_SNI_HOST_NAME
wolfSSL_UseSNI(wsi->ssl, WOLFSSL_SNI_HOST_NAME,
hostname, strlen(hostname));
#endif
#endif
#else
#ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
SSL_set_tlsext_host_name(wsi->ssl, hostname);
#endif
#endif
#ifdef USE_WOLFSSL
/*
* wolfSSL/CyaSSL does certificate verification differently
* from OpenSSL.
* If we should ignore the certificate, we need to set
* this before SSL_new and SSL_connect is called.
* Otherwise the connect will simply fail with error
* code -155
*/
#ifdef USE_OLD_CYASSL
if (wsi->use_ssl == 2)
CyaSSL_set_verify(wsi->ssl,
SSL_VERIFY_NONE, NULL);
#else
if (wsi->use_ssl == 2)
wolfSSL_set_verify(wsi->ssl,
SSL_VERIFY_NONE, NULL);
#endif
#endif /* USE_WOLFSSL */
wsi->client_bio =
BIO_new_socket(wsi->sock, BIO_NOCLOSE);
SSL_set_bio(wsi->ssl, wsi->client_bio, wsi->client_bio);
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
CyaSSL_set_using_nonblock(wsi->ssl, 1);
#else
wolfSSL_set_using_nonblock(wsi->ssl, 1);
#endif
#else
BIO_set_nbio(wsi->client_bio, 1); /* nonblocking */
#endif
SSL_set_ex_data(wsi->ssl,
openssl_websocket_private_data_index,
context);
}
if (wsi->use_ssl) {
lws_latency_pre(context, wsi);
n = SSL_connect(wsi->ssl);
lws_latency(context, wsi,
"SSL_connect LWSCM_WSCL_ISSUE_HANDSHAKE", n, n > 0);
if (n < 0) {
n = SSL_get_error(wsi->ssl, n);
if (n == SSL_ERROR_WANT_READ)
goto some_wait;
if (n == SSL_ERROR_WANT_WRITE) {
/*
* wants us to retry connect due to
* state of the underlying ssl layer...
* but since it may be stalled on
* blocked write, no incoming data may
* arrive to trigger the retry.
* Force (possibly many times if the SSL
* state persists in returning the
* condition code, but other sockets
* are getting serviced inbetweentimes)
* us to get called back when writable.
*/
lwsl_info("%s: WANT_WRITE... retrying\n", __func__);
lws_callback_on_writable(wsi);
some_wait:
wsi->mode = LWSCM_WSCL_WAITING_SSL;
return 0; /* no error */
}
n = -1;
}
if (n <= 0) {
/*
* retry if new data comes until we
* run into the connection timeout or win
*/
n = ERR_get_error();
if (n != SSL_ERROR_NONE) {
lwsl_err("SSL connect error %lu: %s\n",
n, ERR_error_string(n, sb));
return 0;
}
}
} else
wsi->ssl = NULL;
/* fallthru */
case LWSCM_WSCL_WAITING_SSL:
if (wsi->use_ssl) {
if (wsi->mode == LWSCM_WSCL_WAITING_SSL) {
lws_latency_pre(context, wsi);
n = SSL_connect(wsi->ssl);
lws_latency(context, wsi,
"SSL_connect LWSCM_WSCL_WAITING_SSL",
n, n > 0);
if (n < 0) {
n = SSL_get_error(wsi->ssl, n);
if (n == SSL_ERROR_WANT_READ)
goto some_wait;
if (n == SSL_ERROR_WANT_WRITE) {
/*
* wants us to retry connect due to
* state of the underlying ssl layer...
* but since it may be stalled on
* blocked write, no incoming data may
* arrive to trigger the retry.
* Force (possibly many times if the SSL
* state persists in returning the
* condition code, but other sockets
* are getting serviced inbetweentimes)
* us to get called back when writable.
*/
lwsl_info("SSL_connect WANT_WRITE... retrying\n");
lws_callback_on_writable(wsi);
goto some_wait;
}
n = -1;
}
if (n <= 0) {
/*
* retry if new data comes until we
* run into the connection timeout or win
*/
n = ERR_get_error();
if (n != SSL_ERROR_NONE) {
lwsl_err("SSL connect error %lu: %s\n",
n, ERR_error_string(n, sb));
return 0;
}
}
}
#ifndef USE_WOLFSSL
/*
* See comment above about wolfSSL certificate
* verification
*/
lws_latency_pre(context, wsi);
n = SSL_get_verify_result(wsi->ssl);
lws_latency(context, wsi,
"SSL_get_verify_result LWS_CONNMODE..HANDSHAKE",
n, n > 0);
if (n != X509_V_OK) {
if ((n == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT ||
n == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN) && wsi->use_ssl == 2) {
lwsl_notice("accepting self-signed certificate\n");
} else {
lwsl_err("server's cert didn't look good, X509_V_ERR = %d: %s\n",
n, ERR_error_string(n, sb));
lws_close_free_wsi(wsi,
LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
}
#endif /* USE_WOLFSSL */
} else
wsi->ssl = NULL;
#endif
wsi->mode = LWSCM_WSCL_ISSUE_HANDSHAKE2;
lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_CLIENT_HS_SEND,
AWAITING_TIMEOUT);
/* fallthru */
case LWSCM_WSCL_ISSUE_HANDSHAKE2:
p = lws_generate_client_handshake(wsi, p);
if (p == NULL) {
lwsl_err("Failed to generate handshake for client\n");
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 0;
}
/* send our request to the server */
lws_latency_pre(context, wsi);
n = lws_ssl_capable_write(wsi, (unsigned char *)sb, p - sb);
lws_latency(context, wsi, "send lws_issue_raw", n,
n == p - sb);
switch (n) {
case LWS_SSL_CAPABLE_ERROR:
lwsl_debug("ERROR writing to client socket\n");
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 0;
case LWS_SSL_CAPABLE_MORE_SERVICE:
lws_callback_on_writable(wsi);
break;
}
wsi->u.hdr.parser_state = WSI_TOKEN_NAME_PART;
wsi->u.hdr.lextable_pos = 0;
wsi->mode = LWSCM_WSCL_WAITING_SERVER_REPLY;
lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_SERVER_RESPONSE,
AWAITING_TIMEOUT);
break;
case LWSCM_WSCL_WAITING_SERVER_REPLY:
/* handle server hung up on us */
if (pollfd->revents & LWS_POLLHUP) {
lwsl_debug("Server connection %p (fd=%d) dead\n",
(void *)wsi, pollfd->fd);
goto bail3;
}
if (!(pollfd->revents & LWS_POLLIN))
break;
/* interpret the server response */
/*
* HTTP/1.1 101 Switching Protocols
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Accept: me89jWimTRKTWwrS3aRrL53YZSo=
* Sec-WebSocket-Nonce: AQIDBAUGBwgJCgsMDQ4PEC==
* Sec-WebSocket-Protocol: chat
*/
/*
* we have to take some care here to only take from the
* socket bytewise. The browser may (and has been seen to
* in the case that onopen() performs websocket traffic)
* coalesce both handshake response and websocket traffic
* in one packet, since at that point the connection is
* definitively ready from browser pov.
*/
len = 1;
while (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE &&
len > 0) {
n = lws_ssl_capable_read(wsi, &c, 1);
lws_latency(context, wsi, "send lws_issue_raw", n,
n == 1);
switch (n) {
case 0:
case LWS_SSL_CAPABLE_ERROR:
goto bail3;
case LWS_SSL_CAPABLE_MORE_SERVICE:
return 0;
}
if (lws_parse(wsi, c)) {
lwsl_warn("problems parsing header\n");
goto bail3;
}
}
/*
* hs may also be coming in multiple packets, there is a 5-sec
* libwebsocket timeout still active here too, so if parsing did
* not complete just wait for next packet coming in this state
*/
if (wsi->u.hdr.parser_state != WSI_PARSING_COMPLETE)
break;
/*
* otherwise deal with the handshake. If there's any
* packet traffic already arrived we'll trigger poll() again
* right away and deal with it that way
*/
return lws_client_interpret_server_handshake(wsi);
bail3:
lwsl_info("closing conn at LWS_CONNMODE...SERVER_REPLY\n");
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return -1;
case LWSCM_WSCL_WAITING_EXTENSION_CONNECT:
lwsl_ext("LWSCM_WSCL_WAITING_EXTENSION_CONNECT\n");
break;
case LWSCM_WSCL_PENDING_CANDIDATE_CHILD:
lwsl_ext("LWSCM_WSCL_PENDING_CANDIDATE_CHILD\n");
break;
default:
break;
}
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 LWSCM_HTTP_SERVING:
case LWSCM_HTTP_SERVING_ACCEPTED:
case LWSCM_HTTP2_SERVING:
/* handle http headers coming in */
/* pending truncated sends have uber priority */
if (wsi->trunc_len) {
if (!(pollfd->revents & LWS_POLLOUT))
break;
if (lws_issue_raw(wsi, wsi->trunc_alloc + wsi->trunc_offset,
wsi->trunc_len) < 0)
goto fail;
/*
* we can't afford to allow input processing send
* something new, so spin around he event loop until
* he doesn't have any partials
*/
break;
}
/* any incoming data ready? */
if (!(pollfd->revents & pollfd->events && LWS_POLLIN))
goto try_pollout;
len = lws_ssl_capable_read(wsi, context->serv_buf,
sizeof(context->serv_buf));
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 != LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
/*
* hm this may want to send
* (via HTTP callback for example)
*/
n = lws_read(wsi, context->serv_buf, 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(wsi, LWS_EV_STOP | LWS_EV_WRITE);
if (wsi->state != LWSS_HTTP_ISSUING_FILE) {
n = user_callback_handle_rxflow(
wsi->protocol->callback,
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(wsi);
if (n < 0 || (n > 0 && lws_http_transaction_completed(wsi)))
goto fail;
break;
case LWSCM_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 LWSCM_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)(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)(new_wsi,
LWS_CALLBACK_SERVER_NEW_CLIENT_INSTANTIATED,
NULL, NULL, 0);
lws_libev_accept(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(&wsi, new_wsi, accept_fd, pollfd))
return 0;
fail:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return 1;
}
int
lws_handle_POLLOUT_event(struct lws *wsi, struct lws_pollfd *pollfd)
{
int write_type = LWS_WRITE_PONG;
struct lws_tokens eff_buf;
#ifdef LWS_USE_HTTP2
struct lws *wsi2;
#endif
int ret, m, n;
/*
* user callback is lowest priority to get these notifications
* actually, since other pending things cannot be disordered
*/
/* Priority 1: pending truncated sends are incomplete ws fragments
* If anything else sent first the protocol would be
* corrupted.
*/
if (wsi->trunc_len) {
if (lws_issue_raw(wsi, wsi->trunc_alloc + wsi->trunc_offset,
wsi->trunc_len) < 0) {
lwsl_info("%s signalling to close\n", __func__);
return -1;
}
/* leave POLLOUT active either way */
return 0;
} else
if (wsi->state == LWSS_FLUSHING_STORED_SEND_BEFORE_CLOSE)
return -1; /* retry closing now */
#ifdef LWS_USE_HTTP2
/* Priority 2: protocol packets
*/
if (wsi->pps) {
lwsl_info("servicing pps %d\n", wsi->pps);
switch (wsi->pps) {
case LWS_PPS_HTTP2_MY_SETTINGS:
case LWS_PPS_HTTP2_ACK_SETTINGS:
lws_http2_do_pps_send(lws_get_context(wsi), wsi);
break;
default:
break;
}
wsi->pps = LWS_PPS_NONE;
lws_rx_flow_control(wsi, 1);
return 0; /* leave POLLOUT active */
}
#endif
/* Priority 3: pending control packets (pong or close)
*/
if ((wsi->state == LWSS_ESTABLISHED &&
wsi->u.ws.ping_pending_flag) ||
(wsi->state == LWSS_RETURNED_CLOSE_ALREADY &&
wsi->u.ws.payload_is_close)) {
if (wsi->u.ws.payload_is_close)
write_type = LWS_WRITE_CLOSE;
n = lws_write(wsi, &wsi->u.ws.ping_payload_buf[LWS_PRE],
wsi->u.ws.ping_payload_len, write_type);
if (n < 0)
return -1;
/* well he is sent, mark him done */
wsi->u.ws.ping_pending_flag = 0;
if (wsi->u.ws.payload_is_close)
/* oh... a close frame was it... then we are done */
return -1;
/* otherwise for PING, leave POLLOUT active either way */
return 0;
}
/* Priority 4: if we are closing, not allowed to send more data frags
* which means user callback or tx ext flush banned now
*/
if (wsi->state == LWSS_RETURNED_CLOSE_ALREADY)
goto user_service;
/* Priority 5: Tx path extension with more to send
*
* These are handled as new fragments each time around
* So while we must block new writeable callback to enforce
* payload ordering, but since they are always complete
* fragments control packets can interleave OK.
*/
if (wsi->state == LWSS_ESTABLISHED && wsi->u.ws.tx_draining_ext) {
lwsl_ext("SERVICING TX EXT DRAINING\n");
if (lws_write(wsi, NULL, 0, LWS_WRITE_CONTINUATION) < 0)
return -1;
/* leave POLLOUT active */
return 0;
}
/* Priority 6: user can get the callback
*/
m = lws_ext_cb_active(wsi, LWS_EXT_CB_IS_WRITEABLE, NULL, 0);
#ifndef LWS_NO_EXTENSIONS
if (!wsi->extension_data_pending)
goto user_service;
#endif
/*
* check in on the active extensions, see if they
* had pending stuff to spill... they need to get the
* first look-in otherwise sequence will be disordered
*
* NULL, zero-length eff_buf means just spill pending
*/
ret = 1;
while (ret == 1) {
/* default to nobody has more to spill */
ret = 0;
eff_buf.token = NULL;
eff_buf.token_len = 0;
/* give every extension a chance to spill */
m = lws_ext_cb_active(wsi,
LWS_EXT_CB_PACKET_TX_PRESEND,
&eff_buf, 0);
if (m < 0) {
lwsl_err("ext reports fatal error\n");
return -1;
}
if (m)
/*
* at least one extension told us he has more
* to spill, so we will go around again after
*/
ret = 1;
/* assuming they gave us something to send, send it */
if (eff_buf.token_len) {
n = lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len);
if (n < 0) {
lwsl_info("closing from POLLOUT spill\n");
return -1;
}
/*
* Keep amount spilled small to minimize chance of this
*/
if (n != eff_buf.token_len) {
lwsl_err("Unable to spill ext %d vs %s\n",
eff_buf.token_len, n);
return -1;
}
} else
continue;
/* no extension has more to spill */
if (!ret)
continue;
/*
* There's more to spill from an extension, but we just sent
* something... did that leave the pipe choked?
*/
if (!lws_send_pipe_choked(wsi))
/* no we could add more */
continue;
lwsl_info("choked in POLLOUT service\n");
/*
* Yes, he's choked. Leave the POLLOUT masked on so we will
* come back here when he is unchoked. Don't call the user
* callback to enforce ordering of spilling, he'll get called
* when we come back here and there's nothing more to spill.
*/
return 0;
}
#ifndef LWS_NO_EXTENSIONS
wsi->extension_data_pending = 0;
#endif
user_service:
/* one shot */
if (pollfd) {
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failed at set pollfd\n");
return 1;
}
lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
}
#ifdef LWS_USE_HTTP2
/*
* we are the 'network wsi' for potentially many muxed child wsi with
* no network connection of their own, who have to use us for all their
* network actions. So we use a round-robin scheme to share out the
* POLLOUT notifications to our children.
*
* But because any child could exhaust the socket's ability to take
* writes, we can only let one child get notified each time.
*
* In addition children may be closed / deleted / added between POLLOUT
* notifications, so we can't hold pointers
*/
if (wsi->mode != LWSCM_HTTP2_SERVING) {
lwsl_info("%s: non http2\n", __func__);
goto notify;
}
wsi->u.http2.requested_POLLOUT = 0;
if (!wsi->u.http2.initialized) {
lwsl_info("pollout on uninitialized http2 conn\n");
return 0;
}
lwsl_info("%s: doing children\n", __func__);
wsi2 = wsi;
do {
wsi2 = wsi2->u.http2.next_child_wsi;
lwsl_info("%s: child %p\n", __func__, wsi2);
if (!wsi2)
continue;
if (!wsi2->u.http2.requested_POLLOUT)
continue;
wsi2->u.http2.requested_POLLOUT = 0;
if (lws_calllback_as_writeable(wsi2)) {
lwsl_debug("Closing POLLOUT child\n");
lws_close_free_wsi(wsi2, LWS_CLOSE_STATUS_NOSTATUS);
}
wsi2 = wsi;
} while (wsi2 != NULL && !lws_send_pipe_choked(wsi));
lwsl_info("%s: completed\n", __func__);
return 0;
notify:
#endif
return lws_calllback_as_writeable(wsi);
}
struct lws *
lws_client_connect_2(struct lws *wsi)
{
#ifdef LWS_USE_IPV6
struct sockaddr_in6 server_addr6;
struct sockaddr_in6 client_addr6;
struct addrinfo hints, *result;
#endif
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
struct sockaddr_in server_addr4;
struct sockaddr_in client_addr4;
struct lws_pollfd pfd;
struct sockaddr *v;
int n, plen = 0;
const char *ads;
lwsl_client("%s\n", __func__);
/* proxy? */
if (context->http_proxy_port) {
plen = sprintf((char *)pt->serv_buf,
"CONNECT %s:%u HTTP/1.0\x0d\x0a"
"User-agent: libwebsockets\x0d\x0a",
lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS),
wsi->u.hdr.ah->c_port);
if (context->proxy_basic_auth_token[0])
plen += sprintf((char *)pt->serv_buf + plen,
"Proxy-authorization: basic %s\x0d\x0a",
context->proxy_basic_auth_token);
plen += sprintf((char *)pt->serv_buf + plen, "\x0d\x0a");
ads = context->http_proxy_address;
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
memset(&server_addr6, 0, sizeof(struct sockaddr_in6));
server_addr6.sin6_port = htons(context->http_proxy_port);
} else
#endif
server_addr4.sin_port = htons(context->http_proxy_port);
} else {
ads = lws_hdr_simple_ptr(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS);
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
memset(&server_addr6, 0, sizeof(struct sockaddr_in6));
server_addr6.sin6_port = htons(wsi->u.hdr.ah->c_port);
} else
#endif
server_addr4.sin_port = htons(wsi->u.hdr.ah->c_port);
}
/*
* prepare the actual connection (to the proxy, if any)
*/
lwsl_client("%s: address %s\n", __func__, ads);
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
memset(&hints, 0, sizeof(struct addrinfo));
#if !defined(__ANDROID__)
hints.ai_family = AF_INET6;
hints.ai_flags = AI_V4MAPPED;
#endif
n = getaddrinfo(ads, NULL, &hints, &result);
if (n) {
#ifdef _WIN32
lwsl_err("getaddrinfo: %ls\n", gai_strerrorW(n));
#else
lwsl_err("getaddrinfo: %s\n", gai_strerror(n));
#endif
goto oom4;
}
server_addr6.sin6_family = AF_INET6;
switch (result->ai_family) {
#if defined(__ANDROID__)
case AF_INET:
/* map IPv4 to IPv6 */
bzero((char *)&server_addr6.sin6_addr,
sizeof(struct in6_addr));
server_addr6.sin6_addr.s6_addr[10] = 0xff;
server_addr6.sin6_addr.s6_addr[11] = 0xff;
memcpy(&server_addr6.sin6_addr.s6_addr[12],
&((struct sockaddr_in *)result->ai_addr)->sin_addr,
sizeof(struct in_addr));
break;
#endif
case AF_INET6:
memcpy(&server_addr6.sin6_addr,
&((struct sockaddr_in6 *)result->ai_addr)->sin6_addr,
sizeof(struct in6_addr));
break;
default:
lwsl_err("Unknown address family\n");
freeaddrinfo(result);
goto oom4;
}
freeaddrinfo(result);
} else
#endif
{
struct addrinfo ai, *res, *result;
void *p = NULL;
memset (&ai, 0, sizeof ai);
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
ai.ai_flags = AI_CANONNAME;
if (getaddrinfo(ads, NULL, &ai, &result))
goto oom4;
res = result;
while (!p && res) {
switch (res->ai_family) {
case AF_INET:
p = &((struct sockaddr_in *)res->ai_addr)->sin_addr;
break;
}
res = res->ai_next;
}
if (!p) {
freeaddrinfo(result);
goto oom4;
}
server_addr4.sin_family = AF_INET;
server_addr4.sin_addr = *((struct in_addr *)p);
bzero(&server_addr4.sin_zero, 8);
freeaddrinfo(result);
}
if (!lws_socket_is_valid(wsi->sock)) {
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context))
wsi->sock = socket(AF_INET6, SOCK_STREAM, 0);
else
#endif
wsi->sock = socket(AF_INET, SOCK_STREAM, 0);
if (!lws_socket_is_valid(wsi->sock)) {
lwsl_warn("Unable to open socket\n");
goto oom4;
}
if (lws_plat_set_socket_options(context, wsi->sock)) {
lwsl_err("Failed to set wsi socket options\n");
compatible_close(wsi->sock);
goto oom4;
}
wsi->mode = LWSCM_WSCL_WAITING_CONNECT;
lws_libev_accept(wsi, wsi->sock);
if (insert_wsi_socket_into_fds(context, wsi)) {
compatible_close(wsi->sock);
goto oom4;
}
/*
* past here, we can't simply free the structs as error
* handling as oom4 does. We have to run the whole close flow.
*/
lws_set_timeout(wsi,
PENDING_TIMEOUT_AWAITING_CONNECT_RESPONSE,
AWAITING_TIMEOUT);
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
v = (struct sockaddr *)&client_addr6;
n = sizeof(client_addr6);
bzero((char *)v, n);
client_addr6.sin6_family = AF_INET6;
} else
#endif
{
v = (struct sockaddr *)&client_addr4;
n = sizeof(client_addr4);
bzero((char *)v, n);
client_addr4.sin_family = AF_INET;
}
if (context->iface) {
if (interface_to_sa(context, context->iface,
(struct sockaddr_in *)v, n) < 0) {
lwsl_err("Unable to find interface %s\n",
context->iface);
goto failed;
}
if (bind(wsi->sock, v, n) < 0) {
lwsl_err("Error binding to interface %s",
context->iface);
goto failed;
}
}
}
#ifdef LWS_USE_IPV6
if (LWS_IPV6_ENABLED(context)) {
v = (struct sockaddr *)&server_addr6;
n = sizeof(struct sockaddr_in6);
} else
#endif
{
v = (struct sockaddr *)&server_addr4;
n = sizeof(struct sockaddr);
}
if (connect(wsi->sock, v, n) == -1 || LWS_ERRNO == LWS_EISCONN) {
if (LWS_ERRNO == LWS_EALREADY ||
LWS_ERRNO == LWS_EINPROGRESS ||
LWS_ERRNO == LWS_EWOULDBLOCK
#ifdef _WIN32
|| LWS_ERRNO == WSAEINVAL
#endif
) {
lwsl_client("nonblocking connect retry\n");
/*
* must do specifically a POLLOUT poll to hear
* about the connect completion
*/
if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
goto failed;
lws_libev_io(wsi, LWS_EV_START | LWS_EV_WRITE);
return wsi;
}
if (LWS_ERRNO != LWS_EISCONN) {
lwsl_debug("Connect failed errno=%d\n", LWS_ERRNO);
goto failed;
}
}
lwsl_client("connected\n");
/* we are connected to server, or proxy */
if (context->http_proxy_port) {
/*
* OK from now on we talk via the proxy, so connect to that
*
* (will overwrite existing pointer,
* leaving old string/frag there but unreferenced)
*/
if (lws_hdr_simple_create(wsi, _WSI_TOKEN_CLIENT_PEER_ADDRESS,
context->http_proxy_address))
goto failed;
wsi->u.hdr.ah->c_port = context->http_proxy_port;
n = send(wsi->sock, (char *)pt->serv_buf, plen,
MSG_NOSIGNAL);
if (n < 0) {
lwsl_debug("ERROR writing to proxy socket\n");
goto failed;
}
lws_set_timeout(wsi, PENDING_TIMEOUT_AWAITING_PROXY_RESPONSE,
AWAITING_TIMEOUT);
wsi->mode = LWSCM_WSCL_WAITING_PROXY_REPLY;
return wsi;
}
/*
* provoke service to issue the handshake directly
* we need to do it this way because in the proxy case, this is the
* next state and executed only if and when we get a good proxy
* response inside the state machine... but notice in SSL case this
* may not have sent anything yet with 0 return, and won't until some
* many retries from main loop. To stop that becoming endless,
* cover with a timeout.
*/
lws_set_timeout(wsi, PENDING_TIMEOUT_SENT_CLIENT_HANDSHAKE,
AWAITING_TIMEOUT);
wsi->mode = LWSCM_WSCL_ISSUE_HANDSHAKE;
pfd.fd = wsi->sock;
pfd.revents = LWS_POLLIN;
n = lws_service_fd(context, &pfd);
if (n < 0)
goto failed;
if (n) /* returns 1 on failure after closing wsi */
return NULL;
return wsi;
oom4:
lws_free_header_table(wsi);
lws_free(wsi);
return NULL;
failed:
lws_close_free_wsi(wsi, LWS_CLOSE_STATUS_NOSTATUS);
return NULL;
}
LWS_VISIBLE int
libwebsocket_callback_on_writable(struct libwebsocket_context *context,
struct libwebsocket *wsi)
{
#ifdef LWS_USE_HTTP2
struct libwebsocket *network_wsi, *wsi2;
int already;
lwsl_info("%s: %p\n", __func__, wsi);
if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING)
goto network_sock;
if (wsi->u.http2.requested_POLLOUT) {
lwsl_info("already pending writable\n");
return 1;
}
if (wsi->u.http2.tx_credit <= 0) {
/*
* other side is not able to cope with us sending
* anything so no matter if we have POLLOUT on our side.
*
* Delay waiting for our POLLOUT until peer indicates he has
* space for more using tx window command in http2 layer
*/
lwsl_info("%s: %p: waiting_tx_credit (%d)\n", __func__, wsi, wsi->u.http2.tx_credit);
wsi->u.http2.waiting_tx_credit = 1;
return 0;
}
network_wsi = lws_http2_get_network_wsi(wsi);
already = network_wsi->u.http2.requested_POLLOUT;
/* mark everybody above him as requesting pollout */
wsi2 = wsi;
while (wsi2) {
wsi2->u.http2.requested_POLLOUT = 1;
lwsl_info("mark %p pending writable\n", wsi2);
wsi2 = wsi2->u.http2.parent_wsi;
}
/* for network action, act only on the network wsi */
wsi = network_wsi;
if (already)
return 1;
network_sock:
#endif
(void)context;
if (lws_ext_callback_for_each_active(wsi,
LWS_EXT_CALLBACK_REQUEST_ON_WRITEABLE, NULL, 0))
return 1;
if (wsi->position_in_fds_table < 0) {
lwsl_err("%s: failed to find socket %d\n", __func__, wsi->sock);
return -1;
}
if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
return -1;
lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_WRITE);
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) {
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
remove_wsi_socket_from_fds(struct lws *wsi)
{
struct lws_pollargs pa = { wsi->sock, 0, 0 };
#ifndef LWS_NO_SERVER
struct lws_pollargs pa1;
#endif
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
struct lws *end_wsi;
int m, ret = 0;
#if !defined(_WIN32) && !defined(MBED_OPERATORS)
if (wsi->sock > context->max_fds) {
lwsl_err("fd %d too high (%d)\n", wsi->sock, context->max_fds);
return 1;
}
#endif
if (context->protocols[0].callback(wsi, LWS_CALLBACK_LOCK_POLL,
wsi->user_space, (void *)&pa, 1))
return -1;
lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_READ | LWS_EV_WRITE);
lws_pt_lock(pt);
lwsl_info("%s: wsi=%p, sock=%d, fds pos=%d, end guy pos=%d, endfd=%d\n",
__func__, wsi, wsi->sock, wsi->position_in_fds_table,
pt->fds_count, pt->fds[pt->fds_count].fd);
/* the guy who is to be deleted's slot index in pt->fds */
m = wsi->position_in_fds_table;
/* have the last guy take up the now vacant slot */
pt->fds[m] = pt->fds[pt->fds_count - 1];
lws_plat_delete_socket_from_fds(context, wsi, m);
/* end guy's "position in fds table" is now the deletion guy's old one */
end_wsi = wsi_from_fd(context, pt->fds[pt->fds_count].fd);
assert(end_wsi);
end_wsi->position_in_fds_table = m;
/* deletion guy's lws_lookup entry needs nuking */
delete_from_fd(context, wsi->sock);
/* removed wsi has no position any more */
wsi->position_in_fds_table = -1;
/* remove also from external POLL support via protocol 0 */
if (lws_socket_is_valid(wsi->sock))
if (context->protocols[0].callback(wsi, LWS_CALLBACK_DEL_POLL_FD,
wsi->user_space, (void *) &pa, 0))
ret = -1;
#ifndef LWS_NO_SERVER
/* if this made some room, accept connects on this thread */
if ((unsigned int)pt->fds_count < context->fd_limit_per_thread - 1)
_lws_change_pollfd(pt->wsi_listening, 0, LWS_POLLIN, &pa1);
#endif
lws_pt_unlock(pt);
if (context->protocols[0].callback(wsi, LWS_CALLBACK_UNLOCK_POLL,
wsi->user_space, (void *) &pa, 1))
ret = -1;
return ret;
}
int
lws_handle_POLLOUT_event(struct libwebsocket_context *context,
struct libwebsocket *wsi, struct libwebsocket_pollfd *pollfd)
{
int n;
struct lws_tokens eff_buf;
#ifdef LWS_USE_HTTP2
struct libwebsocket *wsi2;
#endif
int ret;
int m;
int handled = 0;
/* pending truncated sends have uber priority */
if (wsi->truncated_send_len) {
if (lws_issue_raw(wsi, wsi->truncated_send_malloc +
wsi->truncated_send_offset,
wsi->truncated_send_len) < 0) {
lwsl_info("lws_handle_POLLOUT_event signalling to close\n");
return -1;
}
/* leave POLLOUT active either way */
return 0;
} else
if (wsi->state == WSI_STATE_FLUSHING_STORED_SEND_BEFORE_CLOSE) {
lwsl_info("***** %x signalling to close in POLLOUT handler\n", wsi);
return -1; /* retry closing now */
}
#ifdef LWS_USE_HTTP2
/* protocol packets are next */
if (wsi->pps) {
lwsl_info("servicing pps %d\n", wsi->pps);
switch (wsi->pps) {
case LWS_PPS_HTTP2_MY_SETTINGS:
case LWS_PPS_HTTP2_ACK_SETTINGS:
lws_http2_do_pps_send(context, wsi);
break;
default:
break;
}
wsi->pps = LWS_PPS_NONE;
libwebsocket_rx_flow_control(wsi, 1);
return 0; /* leave POLLOUT active */
}
#endif
/* pending control packets have next priority */
if (wsi->state == WSI_STATE_ESTABLISHED && wsi->u.ws.ping_payload_len) {
n = libwebsocket_write(wsi,
&wsi->u.ws.ping_payload_buf[
LWS_SEND_BUFFER_PRE_PADDING],
wsi->u.ws.ping_payload_len,
LWS_WRITE_PONG);
if (n < 0)
return -1;
/* well he is sent, mark him done */
wsi->u.ws.ping_payload_len = 0;
/* leave POLLOUT active either way */
return 0;
}
/* if nothing critical, user can get the callback */
m = lws_ext_callback_for_each_active(wsi, LWS_EXT_CALLBACK_IS_WRITEABLE,
NULL, 0);
#ifndef LWS_NO_EXTENSIONS
if (!wsi->extension_data_pending || handled == 2)
goto user_service;
#endif
/*
* check in on the active extensions, see if they
* had pending stuff to spill... they need to get the
* first look-in otherwise sequence will be disordered
*
* NULL, zero-length eff_buf means just spill pending
*/
ret = 1;
while (ret == 1) {
/* default to nobody has more to spill */
ret = 0;
eff_buf.token = NULL;
eff_buf.token_len = 0;
/* give every extension a chance to spill */
m = lws_ext_callback_for_each_active(wsi,
LWS_EXT_CALLBACK_PACKET_TX_PRESEND,
&eff_buf, 0);
if (m < 0) {
lwsl_err("ext reports fatal error\n");
return -1;
}
if (m)
/*
* at least one extension told us he has more
* to spill, so we will go around again after
*/
ret = 1;
/* assuming they gave us something to send, send it */
if (eff_buf.token_len) {
n = lws_issue_raw(wsi, (unsigned char *)eff_buf.token,
eff_buf.token_len);
if (n < 0) {
lwsl_info("closing from POLLOUT spill\n");
return -1;
}
/*
* Keep amount spilled small to minimize chance of this
*/
if (n != eff_buf.token_len) {
lwsl_err("Unable to spill ext %d vs %s\n",
eff_buf.token_len, n);
return -1;
}
} else
continue;
/* no extension has more to spill */
if (!ret)
continue;
/*
* There's more to spill from an extension, but we just sent
* something... did that leave the pipe choked?
*/
if (!lws_send_pipe_choked(wsi))
/* no we could add more */
continue;
lwsl_info("choked in POLLOUT service\n");
/*
* Yes, he's choked. Leave the POLLOUT masked on so we will
* come back here when he is unchoked. Don't call the user
* callback to enforce ordering of spilling, he'll get called
* when we come back here and there's nothing more to spill.
*/
return 0;
}
#ifndef LWS_NO_EXTENSIONS
wsi->extension_data_pending = 0;
user_service:
#endif
/* one shot */
if (pollfd) {
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0)) {
lwsl_info("failled at set pollfd\n");
return 1;
}
lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_WRITE);
}
#ifdef LWS_USE_HTTP2
/*
* we are the 'network wsi' for potentially many muxed child wsi with
* no network connection of their own, who have to use us for all their
* network actions. So we use a round-robin scheme to share out the
* POLLOUT notifications to our children.
*
* But because any child could exhaust the socket's ability to take
* writes, we can only let one child get notified each time.
*
* In addition children may be closed / deleted / added between POLLOUT
* notifications, so we can't hold pointers
*/
if (wsi->mode != LWS_CONNMODE_HTTP2_SERVING) {
lwsl_info("%s: non http2\n", __func__);
goto notify;
}
wsi->u.http2.requested_POLLOUT = 0;
if (!wsi->u.http2.initialized) {
lwsl_info("pollout on uninitialized http2 conn\n");
return 0;
}
lwsl_info("%s: doing children\n", __func__);
wsi2 = wsi;
do {
wsi2 = wsi2->u.http2.next_child_wsi;
lwsl_info("%s: child %p\n", __func__, wsi2);
if (!wsi2)
continue;
if (!wsi2->u.http2.requested_POLLOUT)
continue;
wsi2->u.http2.requested_POLLOUT = 0;
if (lws_calllback_as_writeable(context, wsi2)) {
lwsl_debug("Closing POLLOUT child\n");
libwebsocket_close_and_free_session(context, wsi2,
LWS_CLOSE_STATUS_NOSTATUS);
}
wsi2 = wsi;
} while (wsi2 != NULL && !lws_send_pipe_choked(wsi));
lwsl_info("%s: completed\n", __func__);
return 0;
notify:
#endif
return lws_calllback_as_writeable(context, wsi);
}
LWS_VISIBLE int
lws_server_socket_service_ssl(struct libwebsocket_context *context,
struct libwebsocket **pwsi, struct libwebsocket *new_wsi,
int accept_fd, struct libwebsocket_pollfd *pollfd)
{
int n, m;
struct libwebsocket *wsi = *pwsi;
#ifndef USE_CYASSL
BIO *bio;
#endif
if (!LWS_SSL_ENABLED(context))
return 0;
switch (wsi->mode) {
case LWS_CONNMODE_SERVER_LISTENER:
if (!new_wsi) {
lwsl_err("no new_wsi\n");
return 0;
}
new_wsi->ssl = SSL_new(context->ssl_ctx);
if (new_wsi->ssl == NULL) {
lwsl_err("SSL_new failed: %s\n",
ERR_error_string(SSL_get_error(
new_wsi->ssl, 0), NULL));
libwebsockets_decode_ssl_error();
lws_free(new_wsi);
compatible_close(accept_fd);
break;
}
SSL_set_ex_data(new_wsi->ssl,
openssl_websocket_private_data_index, context);
SSL_set_fd(new_wsi->ssl, accept_fd);
#ifdef USE_CYASSL
CyaSSL_set_using_nonblock(new_wsi->ssl, 1);
#else
SSL_set_mode(new_wsi->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
bio = SSL_get_rbio(new_wsi->ssl);
if (bio)
BIO_set_nbio(bio, 1); /* nonblocking */
else
lwsl_notice("NULL rbio\n");
bio = SSL_get_wbio(new_wsi->ssl);
if (bio)
BIO_set_nbio(bio, 1); /* nonblocking */
else
lwsl_notice("NULL rbio\n");
#endif
/*
* we are not accepted yet, but we need to enter ourselves
* as a live connection. That way we can retry when more
* pieces come if we're not sorted yet
*/
*pwsi = new_wsi;
wsi = *pwsi;
wsi->mode = LWS_CONNMODE_SSL_ACK_PENDING;
insert_wsi_socket_into_fds(context, wsi);
libwebsocket_set_timeout(wsi, PENDING_TIMEOUT_SSL_ACCEPT,
AWAITING_TIMEOUT);
lwsl_info("inserted SSL accept into fds, trying SSL_accept\n");
/* fallthru */
case LWS_CONNMODE_SSL_ACK_PENDING:
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
goto fail;
lws_libev_io(context, wsi, LWS_EV_STOP | LWS_EV_WRITE);
lws_latency_pre(context, wsi);
n = recv(wsi->sock, context->service_buffer,
sizeof(context->service_buffer), MSG_PEEK);
/*
* optionally allow non-SSL connect on SSL listening socket
* This is disabled by default, if enabled it goes around any
* SSL-level access control (eg, client-side certs) so leave
* it disabled unless you know it's not a problem for you
*/
if (context->allow_non_ssl_on_ssl_port && n >= 1 &&
context->service_buffer[0] >= ' ') {
/*
* TLS content-type for Handshake is 0x16
* TLS content-type for ChangeCipherSpec Record is 0x14
*
* A non-ssl session will start with the HTTP method in
* ASCII. If we see it's not a legit SSL handshake
* kill the SSL for this connection and try to handle
* as a HTTP connection upgrade directly.
*/
wsi->use_ssl = 0;
SSL_shutdown(wsi->ssl);
SSL_free(wsi->ssl);
wsi->ssl = NULL;
goto accepted;
}
/* normal SSL connection processing path */
n = SSL_accept(wsi->ssl);
lws_latency(context, wsi,
"SSL_accept LWS_CONNMODE_SSL_ACK_PENDING\n", n, n == 1);
if (n == 1)
goto accepted;
m = SSL_get_error(wsi->ssl, n);
lwsl_debug("SSL_accept failed %d / %s\n",
m, ERR_error_string(m, NULL));
if (m == SSL_ERROR_WANT_READ) {
if (lws_change_pollfd(wsi, 0, LWS_POLLIN))
goto fail;
lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_READ);
lwsl_info("SSL_ERROR_WANT_READ\n");
break;
}
if (m == SSL_ERROR_WANT_WRITE) {
if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
goto fail;
lws_libev_io(context, wsi, LWS_EV_START | LWS_EV_WRITE);
break;
}
lwsl_debug("SSL_accept failed skt %u: %s\n",
pollfd->fd, ERR_error_string(m, NULL));
goto fail;
accepted:
/* OK, we are accepted... give him some time to negotiate */
libwebsocket_set_timeout(wsi,
PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
AWAITING_TIMEOUT);
wsi->mode = LWS_CONNMODE_HTTP_SERVING;
lws_http2_configure_if_upgraded(wsi);
lwsl_debug("accepted new SSL conn\n");
break;
}
return 0;
fail:
return 1;
}
LWS_VISIBLE int
lws_server_socket_service_ssl(struct lws *wsi, lws_sockfd_type accept_fd)
{
struct lws_context *context = wsi->context;
struct lws_context_per_thread *pt = &context->pt[(int)wsi->tsi];
int n, m;
#ifndef USE_WOLFSSL
BIO *bio;
#endif
if (!LWS_SSL_ENABLED(context))
return 0;
lwsl_err("%s: mode %d, state %d\n", __func__, wsi->mode, wsi->state);
switch (wsi->mode) {
case LWSCM_SSL_INIT:
if (!wsi)
return 0;
wsi->ssl = SSL_new(context->ssl_ctx);
if (wsi->ssl == NULL) {
lwsl_err("SSL_new failed: %s\n",
ERR_error_string(SSL_get_error(wsi->ssl, 0), NULL));
lws_decode_ssl_error();
compatible_close(accept_fd);
goto fail;
}
SSL_set_ex_data(wsi->ssl,
openssl_websocket_private_data_index, context);
SSL_set_fd(wsi->ssl, accept_fd);
#ifdef USE_WOLFSSL
#ifdef USE_OLD_CYASSL
CyaSSL_set_using_nonblock(wsi->ssl, 1);
#else
wolfSSL_set_using_nonblock(wsi->ssl, 1);
#endif
#else
SSL_set_mode(wsi->ssl, SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
bio = SSL_get_rbio(wsi->ssl);
if (bio)
BIO_set_nbio(bio, 1); /* nonblocking */
else
lwsl_notice("NULL rbio\n");
bio = SSL_get_wbio(wsi->ssl);
if (bio)
BIO_set_nbio(bio, 1); /* nonblocking */
else
lwsl_notice("NULL rbio\n");
#endif
/*
* we are not accepted yet, but we need to enter ourselves
* as a live connection. That way we can retry when more
* pieces come if we're not sorted yet
*/
wsi->mode = LWSCM_SSL_ACK_PENDING;
if (insert_wsi_socket_into_fds(context, wsi))
goto fail;
lws_set_timeout(wsi, PENDING_TIMEOUT_SSL_ACCEPT,
AWAITING_TIMEOUT);
lwsl_info("inserted SSL accept into fds, trying SSL_accept\n");
/* fallthru */
case LWSCM_SSL_ACK_PENDING:
if (lws_change_pollfd(wsi, LWS_POLLOUT, 0))
goto fail;
lws_libev_io(wsi, LWS_EV_STOP | LWS_EV_WRITE);
lws_latency_pre(context, wsi);
n = recv(wsi->sock, (char *)pt->serv_buf, LWS_MAX_SOCKET_IO_BUF,
MSG_PEEK);
/*
* optionally allow non-SSL connect on SSL listening socket
* This is disabled by default, if enabled it goes around any
* SSL-level access control (eg, client-side certs) so leave
* it disabled unless you know it's not a problem for you
*/
if (context->allow_non_ssl_on_ssl_port) {
if (n >= 1 && pt->serv_buf[0] >= ' ') {
/*
* TLS content-type for Handshake is 0x16, and
* for ChangeCipherSpec Record, it's 0x14
*
* A non-ssl session will start with the HTTP
* method in ASCII. If we see it's not a legit
* SSL handshake kill the SSL for this
* connection and try to handle as a HTTP
* connection upgrade directly.
*/
wsi->use_ssl = 0;
SSL_shutdown(wsi->ssl);
SSL_free(wsi->ssl);
wsi->ssl = NULL;
goto accepted;
}
if (!n) /*
* connection is gone, or nothing to read
* if it's gone, we will timeout on
* PENDING_TIMEOUT_SSL_ACCEPT
*/
break;
if (n < 0 && (LWS_ERRNO == LWS_EAGAIN ||
LWS_ERRNO == LWS_EWOULDBLOCK)) {
/*
* well, we get no way to know ssl or not
* so go around again waiting for something
* to come and give us a hint, or timeout the
* connection.
*/
m = SSL_ERROR_WANT_READ;
goto go_again;
}
}
/* normal SSL connection processing path */
n = SSL_accept(wsi->ssl);
lws_latency(context, wsi,
"SSL_accept LWSCM_SSL_ACK_PENDING\n", n, n == 1);
if (n == 1)
goto accepted;
m = SSL_get_error(wsi->ssl, n);
lwsl_debug("SSL_accept failed %d / %s\n",
m, ERR_error_string(m, NULL));
go_again:
if (m == SSL_ERROR_WANT_READ) {
if (lws_change_pollfd(wsi, 0, LWS_POLLIN))
goto fail;
lws_libev_io(wsi, LWS_EV_START | LWS_EV_READ);
lwsl_info("SSL_ERROR_WANT_READ\n");
break;
}
if (m == SSL_ERROR_WANT_WRITE) {
if (lws_change_pollfd(wsi, 0, LWS_POLLOUT))
goto fail;
lws_libev_io(wsi, LWS_EV_START | LWS_EV_WRITE);
break;
}
lwsl_debug("SSL_accept failed skt %u: %s\n",
wsi->sock, ERR_error_string(m, NULL));
goto fail;
accepted:
/* OK, we are accepted... give him some time to negotiate */
lws_set_timeout(wsi, PENDING_TIMEOUT_ESTABLISH_WITH_SERVER,
AWAITING_TIMEOUT);
wsi->mode = LWSCM_HTTP_SERVING;
lws_http2_configure_if_upgraded(wsi);
lwsl_debug("accepted new SSL conn\n");
break;
}
return 0;
fail:
return 1;
}