author | Kim Alvefur <zash@zash.se> |
Sat, 29 Jul 2023 01:42:19 +0200 | |
changeset 13254 | cfd062d025b0 |
parent 12978 | ba409c67353b |
permissions | -rw-r--r-- |
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-- Prosody IM |
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-- Copyright (C) 2012 Florian Zeitz |
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-- Copyright (C) 2014 Daurnimator |
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-- |
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-- This project is MIT/X11 licensed. Please see the |
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-- COPYING file in the source package for more information. |
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-- |
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local random_bytes = require "prosody.util.random".bytes; |
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local bit = require "prosody.util.bitcompat"; |
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local band = bit.band; |
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local bor = bit.bor; |
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local sbit = require "prosody.util.strbitop"; |
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local sxor = sbit.sxor; |
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local s_char = string.char; |
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local s_pack = require"prosody.util.struct".pack; |
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local s_unpack = require"prosody.util.struct".unpack; |
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|
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local function pack_uint16be(x) |
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return s_pack(">I2", x); |
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end |
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local function pack_uint64be(x) |
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return s_pack(">I8", x); |
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end |
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local function read_uint16be(str, pos) |
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if type(str) ~= "string" then |
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str, pos = str:sub(pos, pos+1), 1; |
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end |
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return s_unpack(">I2", str, pos); |
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end |
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local function read_uint64be(str, pos) |
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if type(str) ~= "string" then |
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str, pos = str:sub(pos, pos+7), 1; |
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end |
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return s_unpack(">I8", str, pos); |
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end |
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local function parse_frame_header(frame) |
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if frame:len() < 2 then return; end |
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local byte1, byte2 = frame:byte(1, 2); |
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local result = { |
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FIN = band(byte1, 0x80) > 0; |
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RSV1 = band(byte1, 0x40) > 0; |
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RSV2 = band(byte1, 0x20) > 0; |
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RSV3 = band(byte1, 0x10) > 0; |
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opcode = band(byte1, 0x0F); |
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|
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MASK = band(byte2, 0x80) > 0; |
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length = band(byte2, 0x7F); |
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}; |
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local length_bytes = 0; |
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if result.length == 126 then |
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length_bytes = 2; |
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elseif result.length == 127 then |
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length_bytes = 8; |
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end |
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local header_length = 2 + length_bytes + (result.MASK and 4 or 0); |
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if frame:len() < header_length then return; end |
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|
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if length_bytes == 2 then |
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result.length = read_uint16be(frame, 3); |
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elseif length_bytes == 8 then |
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result.length = read_uint64be(frame, 3); |
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end |
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|
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if result.MASK then |
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result.key = frame:sub(length_bytes+3, length_bytes+6); |
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end |
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return result, header_length; |
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end |
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-- XORs the string `str` with the array of bytes `key` |
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local function apply_mask(str, key, from, to) |
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return sxor(str:sub(from or 1, to or -1), key); |
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end |
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local function parse_frame_body(frame, header, pos) |
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if header.MASK then |
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return apply_mask(frame, header.key, pos, pos + header.length - 1); |
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else |
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return frame:sub(pos, pos + header.length - 1); |
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end |
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end |
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local function parse_frame(frame) |
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local result, pos = parse_frame_header(frame); |
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if result == nil or frame:len() < (pos + result.length) then return nil, nil, result; end |
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result.data = parse_frame_body(frame, result, pos+1); |
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return result, pos + result.length; |
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end |
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local function build_frame(desc) |
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local data = desc.data or ""; |
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|
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assert(desc.opcode and desc.opcode >= 0 and desc.opcode <= 0xF, "Invalid WebSocket opcode"); |
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if desc.opcode >= 0x8 then |
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-- RFC 6455 5.5 |
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assert(#data <= 125, "WebSocket control frames MUST have a payload length of 125 bytes or less."); |
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end |
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local b1 = bor(desc.opcode, |
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desc.FIN and 0x80 or 0, |
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desc.RSV1 and 0x40 or 0, |
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111 |
desc.RSV2 and 0x20 or 0, |
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net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
112 |
desc.RSV3 and 0x10 or 0); |
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net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
113 |
|
6395
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
114 |
local b2 = #data; |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
115 |
local length_extra; |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
116 |
if b2 <= 125 then -- 7-bit length |
6389
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
117 |
length_extra = ""; |
6395
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
118 |
elseif b2 <= 0xFFFF then -- 2-byte length |
6389
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net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
119 |
b2 = 126; |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
120 |
length_extra = pack_uint16be(#data); |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
121 |
else -- 8-byte length |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
122 |
b2 = 127; |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
123 |
length_extra = pack_uint64be(#data); |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
124 |
end |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
125 |
|
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
126 |
local key = "" |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
127 |
if desc.MASK then |
11168
4e5a2af9dd19
net.websocket.frames: Use C string XOR implementation
Kim Alvefur <zash@zash.se>
parents:
11161
diff
changeset
|
128 |
key = desc.key |
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Kim Alvefur <zash@zash.se>
parents:
11161
diff
changeset
|
129 |
if not key then |
6389
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
130 |
key = random_bytes(4); |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
131 |
end |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
132 |
b2 = bor(b2, 0x80); |
11168
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Kim Alvefur <zash@zash.se>
parents:
11161
diff
changeset
|
133 |
data = apply_mask(data, key); |
6389
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
134 |
end |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
135 |
|
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
136 |
return s_char(b1, b2) .. length_extra .. key .. data |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
137 |
end |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
138 |
|
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
139 |
local function parse_close(data) |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
140 |
local code, message |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
141 |
if #data >= 2 then |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
142 |
code = read_uint16be(data, 1); |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
143 |
if #data > 2 then |
11110
76f46c2579a2
net.websocket.frames: Allow all methods to work on non-string objects
Matthew Wild <mwild1@gmail.com>
parents:
8731
diff
changeset
|
144 |
message = data:sub(3); |
6389
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
145 |
end |
8eccd07b619c
net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
146 |
end |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
147 |
return code, message |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
148 |
end |
8eccd07b619c
net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
149 |
|
6458
b6514e691a70
net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents:
6398
diff
changeset
|
150 |
local function build_close(code, message, mask) |
6389
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
151 |
local data = pack_uint16be(code); |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
152 |
if message then |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
153 |
assert(#message<=123, "Close reason must be <=123 bytes"); |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
154 |
data = data .. message; |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
155 |
end |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
156 |
return build_frame({ |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
157 |
opcode = 0x8; |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
158 |
FIN = true; |
6458
b6514e691a70
net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents:
6398
diff
changeset
|
159 |
MASK = mask; |
6389
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
160 |
data = data; |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
161 |
}); |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
162 |
end |
8eccd07b619c
net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
163 |
|
8eccd07b619c
net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
164 |
return { |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
165 |
parse_header = parse_frame_header; |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
166 |
parse_body = parse_frame_body; |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
167 |
parse = parse_frame; |
8eccd07b619c
net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
168 |
build = build_frame; |
8eccd07b619c
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
169 |
parse_close = parse_close; |
8eccd07b619c
net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
170 |
build_close = build_close; |
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daurnimator <quae@daurnimator.com>
parents:
diff
changeset
|
171 |
}; |