 /*
 * libwebsockets - small server side websockets and web server implementation
 *
 * Copyright (C) 2010 - 2019 Andy Green <andy@warmcat.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *
 *  This is included from private-lib-core.h if LWS_ROLE_WS
 */

extern const struct lws_role_ops role_ops_ws;

#define lwsi_role_ws(wsi) (wsi->role_ops == &role_ops_ws)

enum lws_rx_parse_state {
	LWS_RXPS_NEW,

	LWS_RXPS_04_mask_1,
	LWS_RXPS_04_mask_2,
	LWS_RXPS_04_mask_3,

	LWS_RXPS_04_FRAME_HDR_1,
	LWS_RXPS_04_FRAME_HDR_LEN,
	LWS_RXPS_04_FRAME_HDR_LEN16_2,
	LWS_RXPS_04_FRAME_HDR_LEN16_1,
	LWS_RXPS_04_FRAME_HDR_LEN64_8,
	LWS_RXPS_04_FRAME_HDR_LEN64_7,
	LWS_RXPS_04_FRAME_HDR_LEN64_6,
	LWS_RXPS_04_FRAME_HDR_LEN64_5,
	LWS_RXPS_04_FRAME_HDR_LEN64_4,
	LWS_RXPS_04_FRAME_HDR_LEN64_3,
	LWS_RXPS_04_FRAME_HDR_LEN64_2,
	LWS_RXPS_04_FRAME_HDR_LEN64_1,

	LWS_RXPS_07_COLLECT_FRAME_KEY_1,
	LWS_RXPS_07_COLLECT_FRAME_KEY_2,
	LWS_RXPS_07_COLLECT_FRAME_KEY_3,
	LWS_RXPS_07_COLLECT_FRAME_KEY_4,

	LWS_RXPS_WS_FRAME_PAYLOAD
};

enum lws_websocket_opcodes_07 {
	LWSWSOPC_CONTINUATION = 0,
	LWSWSOPC_TEXT_FRAME = 1,
	LWSWSOPC_BINARY_FRAME = 2,

	LWSWSOPC_NOSPEC__MUX = 7,

	/* control extensions 8+ */

	LWSWSOPC_CLOSE = 8,
	LWSWSOPC_PING = 9,
	LWSWSOPC_PONG = 0xa,
};

/* this is not usable directly by user code any more, lws_close_reason() */
#define LWS_WRITE_CLOSE 4

#define ALREADY_PROCESSED_IGNORE_CHAR 1
#define ALREADY_PROCESSED_NO_CB 2

#if !defined(LWS_WITHOUT_EXTENSIONS)
struct lws_vhost_role_ws {
	const struct lws_extension *extensions;
};

struct lws_pt_role_ws {
	struct lws *rx_draining_ext_list;
	struct lws *tx_draining_ext_list;
};
#endif

#define PAYLOAD_BUF_SIZE 128 - 3 + LWS_PRE

struct _lws_websocket_related {
	unsigned char *rx_ubuf;
#if !defined(LWS_WITHOUT_EXTENSIONS)
	const struct lws_extension *active_extensions[LWS_MAX_EXTENSIONS_ACTIVE];
	void *act_ext_user[LWS_MAX_EXTENSIONS_ACTIVE];
	struct lws *rx_draining_ext_list;
	struct lws *tx_draining_ext_list;
#endif

#if defined(LWS_WITH_HTTP_PROXY)
	struct lws_dll2_owner proxy_owner;
	char actual_protocol[16];
	size_t proxy_buffered;
#endif

	/* Also used for close content... control opcode == < 128 */
	uint8_t ping_payload_buf[PAYLOAD_BUF_SIZE];
	uint8_t pong_payload_buf[PAYLOAD_BUF_SIZE];

	unsigned int final:1;
	unsigned int frame_is_binary:1;
	unsigned int all_zero_nonce:1;
	unsigned int this_frame_masked:1;
	unsigned int inside_frame:1; /* next write will be more of frame */
	unsigned int clean_buffer:1; /* buffer not rewritten by extension */
	unsigned int payload_is_close:1; /* process as PONG, but it is close */
	unsigned int pong_pending_flag:1;
	unsigned int continuation_possible:1;
	unsigned int owed_a_fin:1;
	unsigned int check_utf8:1;
	unsigned int defeat_check_utf8:1;
	unsigned int stashed_write_pending:1;
	unsigned int send_check_ping:1;
	unsigned int first_fragment:1;
	unsigned int peer_has_sent_close:1;
#if !defined(LWS_WITHOUT_EXTENSIONS)
	unsigned int extension_data_pending:1;
	unsigned int rx_draining_ext:1;
	unsigned int tx_draining_ext:1;
	unsigned int pmd_trailer_application:1;
#endif

	uint8_t mask[4];

	size_t rx_packet_length;
	uint32_t rx_ubuf_head;
	uint32_t rx_ubuf_alloc;

	uint8_t		last_valid;
	uint8_t		last_opcode;	/* for outgoing state validation */
	uint8_t		last_fin;	/* for outgoing state validation */

	uint8_t pong_payload_len;
	uint8_t mask_idx;
	uint8_t opcode;
	uint8_t rsv;
	uint8_t rsv_first_msg;
	/* zero if no info, or length including 2-byte close code */
	uint8_t close_in_ping_buffer_len;
	uint8_t utf8;
	uint8_t stashed_write_type;
	uint8_t tx_draining_stashed_wp;
	uint8_t ietf_spec_revision;
	uint8_t allow_reserved_bits;
	uint8_t allow_unknown_opcode;
#if !defined(LWS_WITHOUT_EXTENSIONS)
	uint8_t count_act_ext;
#endif
};

/*
 * we need to separately track what's happening with both compressed rx in
 * and with inflated rx out that will be passed to the user code
 */

struct lws_ext_pm_deflate_rx_ebufs {
	struct lws_tokens eb_in;
	struct lws_tokens eb_out;
};

lws_handling_result_t
lws_ws_handshake_client(struct lws *wsi, unsigned char **buf, size_t len);

lws_handling_result_t
lws_ws_client_rx_parser_block(struct lws *wsi, const uint8_t **buf, size_t *len);

#if !defined(LWS_WITHOUT_EXTENSIONS)
LWS_VISIBLE void
lws_context_init_extensions(const struct lws_context_creation_info *info,
			    struct lws_context *context);
LWS_EXTERN int
lws_any_extension_handled(struct lws *wsi, enum lws_extension_callback_reasons r,
			  void *v, size_t len);

LWS_EXTERN int
lws_ext_cb_active(struct lws *wsi, int reason, void *buf, int len);
LWS_EXTERN int
lws_ext_cb_all_exts(struct lws_context *context, struct lws *wsi, int reason,
		    void *arg, int len);
LWS_EXTERN int
lws_extension_server_handshake(struct lws *wsi, char **p, int budget);
#endif

int
handshake_0405(struct lws_context *context, struct lws *wsi);
int
lws_process_ws_upgrade(struct lws *wsi);

int
lws_process_ws_upgrade2(struct lws *wsi);

extern const struct lws_protocols lws_ws_proxy;

int
lws_server_init_wsi_for_ws(struct lws *wsi);

void
lws_sul_wsping_cb(lws_sorted_usec_list_t *sul);
