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net/websocket/frames.lua @ 10241:48f7cda4174d
util.bitops: Library to find appropriate bitwise library (closes #1395)
author | Kim Alvefur <zash@zash.se> |
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date | Mon, 22 Jul 2019 01:58:57 +0200 |
parent | 9692:affcbccc1dff |
child | 11114:6a608ecb3471 |
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 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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util.bitops: Library to find appropriate bitwise library (closes #1395)
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12 local bit = require "util.bitcompat"; |
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13 local band = bit.band; |
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14 local bor = bit.bor; |
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15 local bxor = bit.bxor; |
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16 local lshift = bit.lshift; |
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17 local rshift = bit.rshift; |
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18 local unpack = table.unpack or unpack; -- luacheck: ignore 113 |
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19 |
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20 local t_concat = table.concat; |
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21 local s_byte = string.byte; |
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22 local s_char= string.char; |
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23 local s_sub = string.sub; |
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24 local s_pack = string.pack; |
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25 local s_unpack = string.unpack; |
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26 |
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27 if not s_pack and softreq"struct" then |
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28 s_pack = softreq"struct".pack; |
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29 s_unpack = softreq"struct".unpack; |
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30 end |
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31 |
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32 local function read_uint16be(str, pos) |
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33 local l1, l2 = s_byte(str, pos, pos+1); |
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34 return l1*256 + l2; |
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35 end |
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36 -- FIXME: this may lose precision |
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37 local function read_uint64be(str, pos) |
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38 local l1, l2, l3, l4, l5, l6, l7, l8 = s_byte(str, pos, pos+7); |
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39 local h = lshift(l1, 24) + lshift(l2, 16) + lshift(l3, 8) + l4; |
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40 local l = lshift(l5, 24) + lshift(l6, 16) + lshift(l7, 8) + l8; |
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41 return h * 2^32 + l; |
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42 end |
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43 local function pack_uint16be(x) |
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44 return s_char(rshift(x, 8), band(x, 0xFF)); |
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45 end |
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46 local function get_byte(x, n) |
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47 return band(rshift(x, n), 0xFF); |
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48 end |
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49 local function pack_uint64be(x) |
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50 local h = band(x / 2^32, 2^32-1); |
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51 return s_char(get_byte(h, 24), get_byte(h, 16), get_byte(h, 8), band(h, 0xFF), |
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52 get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF)); |
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53 end |
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54 |
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55 if s_pack then |
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56 function pack_uint16be(x) |
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57 return s_pack(">I2", x); |
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58 end |
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59 function pack_uint64be(x) |
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60 return s_pack(">I8", x); |
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61 end |
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62 end |
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63 |
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64 if s_unpack then |
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65 function read_uint16be(str, pos) |
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66 return s_unpack(">I2", str, pos); |
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67 end |
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68 function read_uint64be(str, pos) |
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69 return s_unpack(">I8", str, pos); |
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70 end |
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71 end |
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72 |
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73 local function parse_frame_header(frame) |
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74 if #frame < 2 then return; end |
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75 |
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76 local byte1, byte2 = s_byte(frame, 1, 2); |
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77 local result = { |
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78 FIN = band(byte1, 0x80) > 0; |
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79 RSV1 = band(byte1, 0x40) > 0; |
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80 RSV2 = band(byte1, 0x20) > 0; |
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81 RSV3 = band(byte1, 0x10) > 0; |
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82 opcode = band(byte1, 0x0F); |
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83 |
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84 MASK = band(byte2, 0x80) > 0; |
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85 length = band(byte2, 0x7F); |
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86 }; |
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87 |
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88 local length_bytes = 0; |
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89 if result.length == 126 then |
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90 length_bytes = 2; |
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91 elseif result.length == 127 then |
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92 length_bytes = 8; |
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93 end |
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94 |
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95 local header_length = 2 + length_bytes + (result.MASK and 4 or 0); |
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96 if #frame < header_length then return; end |
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97 |
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98 if length_bytes == 2 then |
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99 result.length = read_uint16be(frame, 3); |
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100 elseif length_bytes == 8 then |
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101 result.length = read_uint64be(frame, 3); |
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102 end |
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103 |
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104 if result.MASK then |
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105 result.key = { s_byte(frame, length_bytes+3, length_bytes+6) }; |
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106 end |
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107 |
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108 return result, header_length; |
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109 end |
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110 |
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111 -- XORs the string `str` with the array of bytes `key` |
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112 -- TODO: optimize |
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113 local function apply_mask(str, key, from, to) |
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114 from = from or 1 |
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115 if from < 0 then from = #str + from + 1 end -- negative indices |
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116 to = to or #str |
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117 if to < 0 then to = #str + to + 1 end -- negative indices |
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118 local key_len = #key |
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119 local counter = 0; |
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120 local data = {}; |
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121 for i = from, to do |
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122 local key_index = counter%key_len + 1; |
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123 counter = counter + 1; |
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124 data[counter] = s_char(bxor(key[key_index], s_byte(str, i))); |
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125 end |
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126 return t_concat(data); |
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127 end |
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128 |
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129 local function parse_frame_body(frame, header, pos) |
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130 if header.MASK then |
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131 return apply_mask(frame, header.key, pos, pos + header.length - 1); |
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132 else |
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133 return frame:sub(pos, pos + header.length - 1); |
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134 end |
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135 end |
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136 |
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137 local function parse_frame(frame) |
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138 local result, pos = parse_frame_header(frame); |
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139 if result == nil or #frame < (pos + result.length) then return; end |
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140 result.data = parse_frame_body(frame, result, pos+1); |
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141 return result, pos + result.length; |
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142 end |
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143 |
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144 local function build_frame(desc) |
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145 local data = desc.data or ""; |
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146 |
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147 assert(desc.opcode and desc.opcode >= 0 and desc.opcode <= 0xF, "Invalid WebSocket opcode"); |
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148 if desc.opcode >= 0x8 then |
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149 -- RFC 6455 5.5 |
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150 assert(#data <= 125, "WebSocket control frames MUST have a payload length of 125 bytes or less."); |
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151 end |
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152 |
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153 local b1 = bor(desc.opcode, |
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154 desc.FIN and 0x80 or 0, |
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155 desc.RSV1 and 0x40 or 0, |
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156 desc.RSV2 and 0x20 or 0, |
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157 desc.RSV3 and 0x10 or 0); |
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158 |
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159 local b2 = #data; |
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160 local length_extra; |
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161 if b2 <= 125 then -- 7-bit length |
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162 length_extra = ""; |
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163 elseif b2 <= 0xFFFF then -- 2-byte length |
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164 b2 = 126; |
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165 length_extra = pack_uint16be(#data); |
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166 else -- 8-byte length |
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167 b2 = 127; |
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168 length_extra = pack_uint64be(#data); |
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169 end |
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170 |
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171 local key = "" |
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172 if desc.MASK then |
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173 local key_a = desc.key |
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174 if key_a then |
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175 key = s_char(unpack(key_a, 1, 4)); |
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176 else |
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177 key = random_bytes(4); |
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178 key_a = {key:byte(1,4)}; |
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179 end |
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180 b2 = bor(b2, 0x80); |
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181 data = apply_mask(data, key_a); |
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182 end |
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183 |
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184 return s_char(b1, b2) .. length_extra .. key .. data |
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185 end |
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186 |
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187 local function parse_close(data) |
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188 local code, message |
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189 if #data >= 2 then |
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190 code = read_uint16be(data, 1); |
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191 if #data > 2 then |
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192 message = s_sub(data, 3); |
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193 end |
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194 end |
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195 return code, message |
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196 end |
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197 |
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198 local function build_close(code, message, mask) |
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199 local data = pack_uint16be(code); |
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200 if message then |
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201 assert(#message<=123, "Close reason must be <=123 bytes"); |
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202 data = data .. message; |
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203 end |
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204 return build_frame({ |
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205 opcode = 0x8; |
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206 FIN = true; |
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207 MASK = mask; |
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208 data = data; |
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209 }); |
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210 end |
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211 |
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212 return { |
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213 parse_header = parse_frame_header; |
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214 parse_body = parse_frame_body; |
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215 parse = parse_frame; |
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216 build = build_frame; |
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217 parse_close = parse_close; |
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218 build_close = build_close; |
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219 }; |