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204 lines
7.0 KiB
204 lines
7.0 KiB
/*
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Copyright (c) 2013 250bpm s.r.o. All rights reserved.
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Copyright (c) 2014 Wirebird Labs LLC. All rights reserved.
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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"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom
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the Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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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
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THE 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
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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#ifndef NN_SWS_INCLUDED
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#define NN_SWS_INCLUDED
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#include "../../transport.h"
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#include "../../aio/fsm.h"
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#include "../../aio/usock.h"
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#include "ws_handshake.h"
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#include "../../utils/msg.h"
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#include "../../utils/list.h"
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/* This state machine handles WebSocket connection from the point where it is
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established to the point when it is broken. */
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/* Return codes of this state machine. */
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#define NN_SWS_RETURN_ERROR 1
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#define NN_SWS_RETURN_CLOSE_HANDSHAKE 2
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#define NN_SWS_RETURN_STOPPED 3
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/* WebSocket protocol header frame sizes. */
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#define NN_SWS_FRAME_SIZE_INITIAL 2
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#define NN_SWS_FRAME_SIZE_PAYLOAD_0 0
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#define NN_SWS_FRAME_SIZE_PAYLOAD_16 2
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#define NN_SWS_FRAME_SIZE_PAYLOAD_63 8
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#define NN_SWS_FRAME_SIZE_MASK 4
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/* WebSocket control bitmasks as per RFC 6455 5.2. */
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#define NN_SWS_FRAME_BITMASK_FIN 0x80
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#define NN_SWS_FRAME_BITMASK_RSV1 0x40
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#define NN_SWS_FRAME_BITMASK_RSV2 0x20
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#define NN_SWS_FRAME_BITMASK_RSV3 0x10
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#define NN_SWS_FRAME_BITMASK_OPCODE 0x0F
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/* UTF-8 validation. */
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#define NN_SWS_UTF8_MAX_CODEPOINT_LEN 4
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/* The longest possible header frame length. As per RFC 6455 5.2:
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first 2 bytes of initial framing + up to 8 bytes of additional
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extended payload length header + 4 byte mask = 14bytes
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Not all messages will use the maximum amount allocated, but
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statically allocating this buffer for convenience. */
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#define NN_SWS_FRAME_MAX_HDR_LEN 14
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/* WebSocket protocol payload length framing RFC 6455 section 5.2. */
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#define NN_SWS_PAYLOAD_MAX_LENGTH 125
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#define NN_SWS_PAYLOAD_MAX_LENGTH_16 65535
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#define NN_SWS_PAYLOAD_MAX_LENGTH_63 9223372036854775807
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#define NN_SWS_PAYLOAD_FRAME_16 0x7E
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#define NN_SWS_PAYLOAD_FRAME_63 0x7F
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/* WebSocket Close Status Code length. */
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#define NN_SWS_CLOSE_CODE_LEN 2
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struct nn_sws {
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/* The state machine. */
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struct nn_fsm fsm;
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int state;
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/* Controls Tx/Rx framing based on whether this peer is acting as
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a Client or a Server. */
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int mode;
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/* The underlying socket. */
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struct nn_usock *usock;
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/* Child state machine to do protocol header exchange. */
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struct nn_ws_handshake handshaker;
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/* The original owner of the underlying socket. */
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struct nn_fsm_owner usock_owner;
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/* Pipe connecting this WebSocket connection to the nanomsg core. */
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struct nn_pipebase pipebase;
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/* Requested resource when acting as client. */
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const char* resource;
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/* Remote Host in header request when acting as client. */
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const char* remote_host;
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/* State of inbound state machine. */
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int instate;
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/* Buffer used to store the framing of incoming message. */
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uint8_t inhdr [NN_SWS_FRAME_MAX_HDR_LEN];
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/* Parsed header frames. */
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uint8_t opcode;
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uint8_t payload_ctl;
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uint8_t masked;
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uint8_t *mask;
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size_t ext_hdr_len;
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int is_final_frame;
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int is_control_frame;
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/* As valid fragments are being received, this flag stays true until
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the FIN bit is received. This state is also used to determine
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peer sequencing anamolies that trigger this endpoint to fail the
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connection. */
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int continuing;
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/* When validating continuation frames of UTF-8, it may be necessary
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to buffer tail-end of the previous frame in order to continue
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validation in the case that frames are chopped on intra-code point
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boundaries. */
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uint8_t utf8_code_pt_fragment [NN_SWS_UTF8_MAX_CODEPOINT_LEN];
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size_t utf8_code_pt_fragment_len;
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/* Statistics on control frames. */
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int pings_sent;
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int pongs_sent;
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int pings_received;
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int pongs_received;
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/* Fragments of message being received at the moment. */
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struct nn_list inmsg_array;
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uint8_t *inmsg_current_chunk_buf;
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size_t inmsg_current_chunk_len;
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size_t inmsg_total_size;
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int inmsg_chunks;
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uint8_t inmsg_hdr;
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/* Control message being received at the moment. Because these can be
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interspersed between fragmented TEXT and BINARY messages, they are
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stored in this buffer so as not to interrupt the message array. */
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uint8_t inmsg_control [NN_SWS_PAYLOAD_MAX_LENGTH];
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/* Reason this connection is closing to send as closing handshake. */
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uint8_t fail_msg [NN_SWS_PAYLOAD_MAX_LENGTH];
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size_t fail_msg_len;
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/* State of the outbound state machine. */
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int outstate;
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/* Buffer used to store the header of outgoing message. */
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uint8_t outhdr [NN_SWS_FRAME_MAX_HDR_LEN];
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/* Message being sent at the moment. */
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struct nn_msg outmsg;
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/* Event raised when the state machine ends. */
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struct nn_fsm_event done;
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};
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/* Scatter/gather array element type forincoming message chunks. Fragmented
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message frames are reassembled prior to notifying the user. */
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struct msg_chunk {
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struct nn_list_item item;
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struct nn_chunkref chunk;
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};
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/* Allocate a new message chunk, append it to message array, and return
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pointer to its buffer. */
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void *nn_msg_chunk_new (size_t size, struct nn_list *msg_array);
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/* Deallocate a message chunk and remove it from array. */
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void nn_msg_chunk_term (struct msg_chunk *it, struct nn_list *msg_array);
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/* Deallocate an entire message array. */
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void nn_msg_array_term (struct nn_list *msg_array);
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/* Returns the length in octets of a single UTF-8 codepoint,
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NN_SWS_UTF8_FRAGMENT if a codepoint began correctly but the length
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of the buffer ran out before validating a full code point, or
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NN_SWS_UTF8_INVALID if an invalid code point is detected. */
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int nn_utf8_code_point (const uint8_t *buffer, size_t len);
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void nn_sws_init (struct nn_sws *self, int src,
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struct nn_epbase *epbase, struct nn_fsm *owner);
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void nn_sws_term (struct nn_sws *self);
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int nn_sws_isidle (struct nn_sws *self);
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void nn_sws_start (struct nn_sws *self, struct nn_usock *usock, int mode,
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const char *resource, const char *host);
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void nn_sws_stop (struct nn_sws *self);
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#endif
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