prosody
4e5a2af9dd19
net/websocket/frames.lua

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net/websocket/frames.lua @ 11164:4e5a2af9dd19 0.11

net.websocket.frames: Use C string XOR implementation
author Kim Alvefur <zash@zash.se>
date Wed, 14 Oct 2020 19:41:42 +0200
parent 11157:413bd21ba449
child 11166:51e5149ed0ad
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
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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 softreq = require "util.dependencies".softreq;
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10 local random_bytes = require "util.random".bytes;
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11
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12 local bit = assert(softreq"bit" or softreq"bit32",
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13 "No bit module found. See https://prosody.im/doc/depends#bitop");
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14 local band = bit.band;
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15 local bor = bit.bor;
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16 local lshift = bit.lshift;
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17 local rshift = bit.rshift;
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18 local sbit = require "util.strbitop";
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19 local sxor = sbit.sxor;
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20
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21 local s_char= string.char;
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22 local s_pack = string.pack; -- luacheck: ignore 143
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23 local s_unpack = string.unpack; -- luacheck: ignore 143
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24
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25 if not s_pack and softreq"struct" then
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26 s_pack = softreq"struct".pack;
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27 s_unpack = softreq"struct".unpack;
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28 end
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29
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30 local function read_uint16be(str, pos)
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31 local l1, l2 = str:byte(pos, pos+1);
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32 return l1*256 + l2;
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33 end
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34 -- FIXME: this may lose precision
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35 local function read_uint64be(str, pos)
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36 local l1, l2, l3, l4, l5, l6, l7, l8 = str:byte(pos, pos+7);
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37 local h = lshift(l1, 24) + lshift(l2, 16) + lshift(l3, 8) + l4;
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38 local l = lshift(l5, 24) + lshift(l6, 16) + lshift(l7, 8) + l8;
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39 return h * 2^32 + l;
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40 end
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41 local function pack_uint16be(x)
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42 return s_char(rshift(x, 8), band(x, 0xFF));
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43 end
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44 local function get_byte(x, n)
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45 return band(rshift(x, n), 0xFF);
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46 end
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47 local function pack_uint64be(x)
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48 local h = band(x / 2^32, 2^32-1);
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49 return s_char(get_byte(h, 24), get_byte(h, 16), get_byte(h, 8), band(h, 0xFF),
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50 get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF));
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51 end
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52
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53 if s_pack then
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54 function pack_uint16be(x)
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55 return s_pack(">I2", x);
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56 end
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57 function pack_uint64be(x)
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58 return s_pack(">I8", x);
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59 end
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60 end
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61
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62 if s_unpack then
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63 function read_uint16be(str, pos)
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64 if type(str) ~= "string" then
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65 str, pos = str:sub(pos, pos+1), 1;
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66 end
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67 return s_unpack(">I2", str, pos);
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68 end
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69 function read_uint64be(str, pos)
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70 if type(str) ~= "string" then
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71 str, pos = str:sub(pos, pos+7), 1;
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72 end
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73 return s_unpack(">I8", str, pos);
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74 end
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75 end
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76
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77 local function parse_frame_header(frame)
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78 if frame:len() < 2 then return; end
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79
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80 local byte1, byte2 = frame:byte(1, 2);
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81 local result = {
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82 FIN = band(byte1, 0x80) > 0;
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83 RSV1 = band(byte1, 0x40) > 0;
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84 RSV2 = band(byte1, 0x20) > 0;
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85 RSV3 = band(byte1, 0x10) > 0;
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86 opcode = band(byte1, 0x0F);
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87
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88 MASK = band(byte2, 0x80) > 0;
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89 length = band(byte2, 0x7F);
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90 };
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91
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92 local length_bytes = 0;
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93 if result.length == 126 then
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94 length_bytes = 2;
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95 elseif result.length == 127 then
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96 length_bytes = 8;
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97 end
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98
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99 local header_length = 2 + length_bytes + (result.MASK and 4 or 0);
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100 if frame:len() < header_length then return; end
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101
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102 if length_bytes == 2 then
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103 result.length = read_uint16be(frame, 3);
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104 elseif length_bytes == 8 then
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105 result.length = read_uint64be(frame, 3);
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106 end
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107
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108 if result.MASK then
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109 result.key = frame:sub(length_bytes+3, length_bytes+6);
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110 end
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111
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112 return result, header_length;
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113 end
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114
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115 -- XORs the string `str` with the array of bytes `key`
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116 -- TODO: optimize
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117 local function apply_mask(str, key, from, to)
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118 return sxor(str:sub(from or 1, to or -1), key);
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119 end
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120
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121 local function parse_frame_body(frame, header, pos)
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122 if header.MASK then
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123 return apply_mask(frame, header.key, pos, pos + header.length - 1);
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124 else
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daurnimator <quae@daurnimator.com>
parents:
diff changeset
125 return frame:sub(pos, pos + header.length - 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
126 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
127 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
128
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
129 local function parse_frame(frame)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
130 local result, pos = parse_frame_header(frame);
11157
413bd21ba449 net.websocket.frames: Read buffer length correctly in Lua 5.1 (fix #1598)
Kim Alvefur <zash@zash.se>
parents: 11112
diff changeset
131 if result == nil or frame:len() < (pos + result.length) then return nil, nil, result; end
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
132 result.data = parse_frame_body(frame, result, pos+1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
133 return result, pos + result.length;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
134 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
135
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
136 local function build_frame(desc)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
137 local data = desc.data or "";
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
138
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
139 assert(desc.opcode and desc.opcode >= 0 and desc.opcode <= 0xF, "Invalid WebSocket opcode");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
140 if desc.opcode >= 0x8 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
141 -- RFC 6455 5.5
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
142 assert(#data <= 125, "WebSocket control frames MUST have a payload length of 125 bytes or less.");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
143 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
144
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
145 local b1 = bor(desc.opcode,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
146 desc.FIN and 0x80 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
147 desc.RSV1 and 0x40 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
148 desc.RSV2 and 0x20 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
149 desc.RSV3 and 0x10 or 0);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
150
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
151 local b2 = #data;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
152 local length_extra;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
153 if b2 <= 125 then -- 7-bit length
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
154 length_extra = "";
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
155 elseif b2 <= 0xFFFF then -- 2-byte length
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
156 b2 = 126;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
157 length_extra = pack_uint16be(#data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
158 else -- 8-byte length
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
159 b2 = 127;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
160 length_extra = pack_uint64be(#data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
161 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
162
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
163 local key = ""
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
164 if desc.MASK then
11164
4e5a2af9dd19 net.websocket.frames: Use C string XOR implementation
Kim Alvefur <zash@zash.se>
parents: 11157
diff changeset
165 key = desc.key
4e5a2af9dd19 net.websocket.frames: Use C string XOR implementation
Kim Alvefur <zash@zash.se>
parents: 11157
diff changeset
166 if not key then
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
167 key = random_bytes(4);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
168 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
169 b2 = bor(b2, 0x80);
11164
4e5a2af9dd19 net.websocket.frames: Use C string XOR implementation
Kim Alvefur <zash@zash.se>
parents: 11157
diff changeset
170 data = apply_mask(data, key);
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
171 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
172
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
173 return s_char(b1, b2) .. length_extra .. key .. data
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
174 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
175
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
176 local function parse_close(data)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
177 local code, message
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
178 if #data >= 2 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
179 code = read_uint16be(data, 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
180 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
181 message = data:sub(3);
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
182 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
183 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
184 return code, message
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
185 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
186
6455
b6514e691a70 net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
187 local function build_close(code, message, mask)
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
188 local data = pack_uint16be(code);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
189 if message then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
190 assert(#message<=123, "Close reason must be <=123 bytes");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
191 data = data .. message;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
192 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
193 return build_frame({
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
194 opcode = 0x8;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
195 FIN = true;
6455
b6514e691a70 net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
196 MASK = mask;
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
197 data = data;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
198 });
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
199 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
200
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
201 return {
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
202 parse_header = parse_frame_header;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
203 parse_body = parse_frame_body;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
204 parse = parse_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
205 build = build_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
206 parse_close = parse_close;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
207 build_close = build_close;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
208 };