prosody
34ac05f6bd10
net/websocket/frames.lua

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net/websocket/frames.lua @ 13744:34ac05f6bd10 13.0

core.configmanager: Fix reporting delayed warnings from global section A Credential in the global section would be stored at delayed_warnings["*/secret"], but get("example.com","secret") would look for delayed_warnings["example.com/secret"] Storing the warnings in the config itself has the unfortunate side-effect that the config now contains util.error objects, which may be awkward if something bypasses get(). Should rawget() also do this filtering? getconfig() too? Currently this only affects prosodyctl, so maybe it won't be much of a problem.
author Kim Alvefur <zash@zash.se>
date Sat, 22 Feb 2025 00:08:18 +0100
parent 13250:cfd062d025b0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 -- Prosody IM
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2 -- Copyright (C) 2012 Florian Zeitz
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3 -- Copyright (C) 2014 Daurnimator
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4 --
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5 -- This project is MIT/X11 licensed. Please see the
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6 -- COPYING file in the source package for more information.
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7 --
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8
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9 local random_bytes = require "prosody.util.random".bytes;
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10
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11 local bit = require "prosody.util.bitcompat";
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12 local band = bit.band;
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13 local bor = bit.bor;
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14 local sbit = require "prosody.util.strbitop";
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15 local sxor = sbit.sxor;
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16
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17 local s_char = string.char;
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18 local s_pack = require"prosody.util.struct".pack;
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19 local s_unpack = require"prosody.util.struct".unpack;
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20
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21 local function pack_uint16be(x)
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22 return s_pack(">I2", x);
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23 end
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24 local function pack_uint64be(x)
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25 return s_pack(">I8", x);
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26 end
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27
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28 local function read_uint16be(str, pos)
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29 if type(str) ~= "string" then
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30 str, pos = str:sub(pos, pos+1), 1;
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31 end
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32 return s_unpack(">I2", str, pos);
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33 end
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34 local function read_uint64be(str, pos)
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35 if type(str) ~= "string" then
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36 str, pos = str:sub(pos, pos+7), 1;
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37 end
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38 return s_unpack(">I8", str, pos);
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39 end
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40
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41 local function parse_frame_header(frame)
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42 if frame:len() < 2 then return; end
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43
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44 local byte1, byte2 = frame:byte(1, 2);
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45 local result = {
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46 FIN = band(byte1, 0x80) > 0;
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47 RSV1 = band(byte1, 0x40) > 0;
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48 RSV2 = band(byte1, 0x20) > 0;
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49 RSV3 = band(byte1, 0x10) > 0;
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50 opcode = band(byte1, 0x0F);
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51
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52 MASK = band(byte2, 0x80) > 0;
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53 length = band(byte2, 0x7F);
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54 };
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55
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56 local length_bytes = 0;
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57 if result.length == 126 then
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58 length_bytes = 2;
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59 elseif result.length == 127 then
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60 length_bytes = 8;
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61 end
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62
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63 local header_length = 2 + length_bytes + (result.MASK and 4 or 0);
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64 if frame:len() < header_length then return; end
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65
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66 if length_bytes == 2 then
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67 result.length = read_uint16be(frame, 3);
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68 elseif length_bytes == 8 then
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69 result.length = read_uint64be(frame, 3);
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70 end
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71
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72 if result.MASK then
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73 result.key = frame:sub(length_bytes+3, length_bytes+6);
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74 end
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75
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76 return result, header_length;
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77 end
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78
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79 -- XORs the string `str` with the array of bytes `key`
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80 local function apply_mask(str, key, from, to)
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81 return sxor(str:sub(from or 1, to or -1), key);
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82 end
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83
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84 local function parse_frame_body(frame, header, pos)
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85 if header.MASK then
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86 return apply_mask(frame, header.key, pos, pos + header.length - 1);
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87 else
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88 return frame:sub(pos, pos + header.length - 1);
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89 end
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90 end
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91
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92 local function parse_frame(frame)
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93 local result, pos = parse_frame_header(frame);
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94 if result == nil or frame:len() < (pos + result.length) then return nil, nil, result; end
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95 result.data = parse_frame_body(frame, result, pos+1);
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96 return result, pos + result.length;
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97 end
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98
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99 local function build_frame(desc)
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100 local data = desc.data or "";
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101
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102 assert(desc.opcode and desc.opcode >= 0 and desc.opcode <= 0xF, "Invalid WebSocket opcode");
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103 if desc.opcode >= 0x8 then
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104 -- RFC 6455 5.5
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105 assert(#data <= 125, "WebSocket control frames MUST have a payload length of 125 bytes or less.");
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106 end
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107
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108 local b1 = bor(desc.opcode,
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109 desc.FIN and 0x80 or 0,
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110 desc.RSV1 and 0x40 or 0,
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111 desc.RSV2 and 0x20 or 0,
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112 desc.RSV3 and 0x10 or 0);
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113
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114 local b2 = #data;
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115 local length_extra;
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116 if b2 <= 125 then -- 7-bit length
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117 length_extra = "";
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118 elseif b2 <= 0xFFFF then -- 2-byte length
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119 b2 = 126;
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120 length_extra = pack_uint16be(#data);
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121 else -- 8-byte length
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122 b2 = 127;
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123 length_extra = pack_uint64be(#data);
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124 end
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125
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126 local key = ""
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127 if desc.MASK then
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128 key = desc.key
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129 if not key then
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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
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
132 b2 = bor(b2, 0x80);
11164
4e5a2af9dd19 net.websocket.frames: Use C string XOR implementation
Kim Alvefur <zash@zash.se>
parents: 11157
diff changeset
133 data = apply_mask(data, key);
6389
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daurnimator <quae@daurnimator.com>
parents:
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134 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
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135
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
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136 return s_char(b1, b2) .. length_extra .. key .. data
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
137 end
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
138
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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
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
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142 code = read_uint16be(data, 1);
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
143 if #data > 2 then
11106
76f46c2579a2 net.websocket.frames: Allow all methods to work on non-string objects
Matthew Wild <mwild1@gmail.com>
parents: 8728
diff changeset
144 message = data:sub(3);
6389
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daurnimator <quae@daurnimator.com>
parents:
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145 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
146 end
8eccd07b619c net/websocket: Add new websocket client code
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
6455
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:
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151 local data = pack_uint16be(code);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
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152 if message then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
153 assert(#message<=123, "Close reason must be <=123 bytes");
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daurnimator <quae@daurnimator.com>
parents:
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154 data = data .. message;
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daurnimator <quae@daurnimator.com>
parents:
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155 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
156 return build_frame({
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
157 opcode = 0x8;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
158 FIN = true;
6455
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 net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
161 });
8eccd07b619c net/websocket: Add new websocket client code
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 net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
165 parse_header = parse_frame_header;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
166 parse_body = parse_frame_body;
8eccd07b619c net/websocket: Add new websocket client code
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 net/websocket: Add new websocket client code
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;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
171 };