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78 lines
2.6 KiB
C
78 lines
2.6 KiB
C
/*
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* Copyright (c) 2016 Lammert Bies
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* Copyright (c) 2013-2016 the Civetweb developers
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* Copyright (c) 2004-2013 Sergey Lyubka
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* ============
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* Release: 1.8
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*/
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#include "httplib_main.h"
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#include "httplib_string.h"
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/*
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* int XX_httplib_is_websocket_protocol( const struct httplib_connection *conn );
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*
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* The function XX_httplib_is_websocket_protocol() checks the request headers
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* to see if the connection is a valid websocket protocol.
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*/
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bool XX_httplib_is_websocket_protocol( const struct httplib_connection *conn ) {
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#if defined(USE_WEBSOCKET)
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const char *upgrade;
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const char *connection;
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/* A websocket protocoll has the following HTTP headers:
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*
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* Connection: Upgrade
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* Upgrade: Websocket
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*/
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upgrade = httplib_get_header(conn, "Upgrade");
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if (upgrade == NULL) return false; /* fail early, don't waste time checking other header * fields */
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if ( httplib_strcasestr(upgrade, "websocket") == NULL ) return false;
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connection = httplib_get_header(conn, "Connection");
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if (connection == NULL) return false;
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if ( httplib_strcasestr(connection, "upgrade") == NULL ) return false;
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/* The headers "Host", "Sec-WebSocket-Key", "Sec-WebSocket-Protocol" and
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* "Sec-WebSocket-Version" are also required.
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* Don't check them here, since even an unsupported websocket protocol
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* request still IS a websocket request (in contrast to a standard HTTP
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* request). It will fail later in handle_websocket_request.
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*/
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return true;
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#else /* defined(USE_WEBSOCKET) */
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UNUSED_PARAMETER(conn);
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return false;
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#endif /* defined(USE_WEBSOCKET) */
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} /* XX_httplib_is_websocket_protocol */
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