prosody
e11e076f0eb8
net/websocket/frames.lua

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net/websocket/frames.lua @ 9691:e11e076f0eb8

various: Don't rely on _G.unpack existing
author Kim Alvefur <zash@zash.se>
date Sat, 08 Dec 2018 17:09:55 +0100
parent 9659:86c431650dfd
child 9692:affcbccc1dff
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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86c431650dfd net.websocket.frames: Prefer Lua 5.2 built-in bit module over LuaJIT version
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12 local bit = assert(softreq"bit32" or softreq"bit",
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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 bxor = bit.bxor;
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17 local lshift = bit.lshift;
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18 local rshift = bit.rshift;
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19 local unpack = table.unpack or unpack; -- luacheck: ignore 113
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20
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21 local t_concat = table.concat;
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22 local s_byte = string.byte;
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23 local s_char= string.char;
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24 local s_sub = string.sub;
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25 local s_pack = string.pack; -- luacheck: ignore 143
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26 local s_unpack = string.unpack; -- luacheck: ignore 143
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27
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28 if not s_pack and softreq"struct" then
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29 s_pack = softreq"struct".pack;
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30 s_unpack = softreq"struct".unpack;
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31 end
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32
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33 local function read_uint16be(str, pos)
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34 local l1, l2 = s_byte(str, pos, pos+1);
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35 return l1*256 + l2;
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36 end
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37 -- FIXME: this may lose precision
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38 local function read_uint64be(str, pos)
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39 local l1, l2, l3, l4, l5, l6, l7, l8 = s_byte(str, pos, pos+7);
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40 local h = lshift(l1, 24) + lshift(l2, 16) + lshift(l3, 8) + l4;
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41 local l = lshift(l5, 24) + lshift(l6, 16) + lshift(l7, 8) + l8;
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42 return h * 2^32 + l;
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43 end
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44 local function pack_uint16be(x)
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45 return s_char(rshift(x, 8), band(x, 0xFF));
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46 end
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47 local function get_byte(x, n)
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48 return band(rshift(x, n), 0xFF);
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49 end
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50 local function pack_uint64be(x)
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51 local h = band(x / 2^32, 2^32-1);
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52 return s_char(get_byte(h, 24), get_byte(h, 16), get_byte(h, 8), band(h, 0xFF),
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53 get_byte(x, 24), get_byte(x, 16), get_byte(x, 8), band(x, 0xFF));
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54 end
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55
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56 if s_pack then
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57 function pack_uint16be(x)
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58 return s_pack(">I2", x);
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59 end
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60 function pack_uint64be(x)
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61 return s_pack(">I8", x);
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62 end
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63 end
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64
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65 if s_unpack then
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66 function read_uint16be(str, pos)
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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 return s_unpack(">I8", str, pos);
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71 end
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72 end
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73
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74 local function parse_frame_header(frame)
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75 if #frame < 2 then return; end
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76
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77 local byte1, byte2 = s_byte(frame, 1, 2);
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78 local result = {
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79 FIN = band(byte1, 0x80) > 0;
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80 RSV1 = band(byte1, 0x40) > 0;
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81 RSV2 = band(byte1, 0x20) > 0;
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82 RSV3 = band(byte1, 0x10) > 0;
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83 opcode = band(byte1, 0x0F);
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84
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85 MASK = band(byte2, 0x80) > 0;
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86 length = band(byte2, 0x7F);
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87 };
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88
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89 local length_bytes = 0;
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90 if result.length == 126 then
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91 length_bytes = 2;
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92 elseif result.length == 127 then
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93 length_bytes = 8;
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94 end
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95
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96 local header_length = 2 + length_bytes + (result.MASK and 4 or 0);
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97 if #frame < header_length then return; end
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98
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99 if length_bytes == 2 then
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100 result.length = read_uint16be(frame, 3);
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101 elseif length_bytes == 8 then
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102 result.length = read_uint64be(frame, 3);
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103 end
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104
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105 if result.MASK then
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106 result.key = { s_byte(frame, length_bytes+3, length_bytes+6) };
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107 end
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108
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109 return result, header_length;
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110 end
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111
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112 -- XORs the string `str` with the array of bytes `key`
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113 -- TODO: optimize
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114 local function apply_mask(str, key, from, to)
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115 from = from or 1
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116 if from < 0 then from = #str + from + 1 end -- negative indices
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117 to = to or #str
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118 if to < 0 then to = #str + to + 1 end -- negative indices
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119 local key_len = #key
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120 local counter = 0;
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121 local data = {};
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122 for i = from, to do
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123 local key_index = counter%key_len + 1;
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124 counter = counter + 1;
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125 data[counter] = s_char(bxor(key[key_index], s_byte(str, i)));
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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 return t_concat(data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
128 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
129
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
130 local function parse_frame_body(frame, header, pos)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
131 if header.MASK then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
132 return apply_mask(frame, header.key, pos, pos + header.length - 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
133 else
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
134 return frame:sub(pos, pos + header.length - 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
135 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
136 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
137
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
138 local function parse_frame(frame)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
139 local result, pos = parse_frame_header(frame);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
140 if result == nil or #frame < (pos + result.length) then return; end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
141 result.data = parse_frame_body(frame, result, pos+1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
142 return result, pos + result.length;
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 function build_frame(desc)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
146 local data = desc.data or "";
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
147
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
148 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
149 if desc.opcode >= 0x8 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
150 -- RFC 6455 5.5
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
151 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
152 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
153
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
154 local b1 = bor(desc.opcode,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
155 desc.FIN and 0x80 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
156 desc.RSV1 and 0x40 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
157 desc.RSV2 and 0x20 or 0,
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
158 desc.RSV3 and 0x10 or 0);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
159
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
160 local b2 = #data;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
161 local length_extra;
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
162 if b2 <= 125 then -- 7-bit length
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
163 length_extra = "";
6395
e0164b0fcafd net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
164 elseif b2 <= 0xFFFF then -- 2-byte length
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
165 b2 = 126;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
166 length_extra = pack_uint16be(#data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
167 else -- 8-byte length
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
168 b2 = 127;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
169 length_extra = pack_uint64be(#data);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
170 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
171
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
172 local key = ""
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
173 if desc.MASK then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
174 local key_a = desc.key
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
175 if key_a then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
176 key = s_char(unpack(key_a, 1, 4));
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
177 else
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
178 key = random_bytes(4);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
179 key_a = {key:byte(1,4)};
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
180 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
181 b2 = bor(b2, 0x80);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
182 data = apply_mask(data, key_a);
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
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
185 return s_char(b1, b2) .. length_extra .. key .. data
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
186 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
187
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
188 local function parse_close(data)
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
189 local code, message
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
190 if #data >= 2 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
191 code = read_uint16be(data, 1);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
192 if #data > 2 then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
193 message = s_sub(data, 3);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
194 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
195 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
196 return code, message
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
197 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
198
6455
b6514e691a70 net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
199 local function build_close(code, message, mask)
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
200 local data = pack_uint16be(code);
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
201 if message then
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
202 assert(#message<=123, "Close reason must be <=123 bytes");
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
203 data = data .. message;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
204 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
205 return build_frame({
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
206 opcode = 0x8;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
207 FIN = true;
6455
b6514e691a70 net.websocket: Make data masking configurable
Florian Zeitz <florob@babelmonkeys.de>
parents: 6398
diff changeset
208 MASK = mask;
6389
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
209 data = data;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
210 });
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
211 end
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
212
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
213 return {
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
214 parse_header = parse_frame_header;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
215 parse_body = parse_frame_body;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
216 parse = parse_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
217 build = build_frame;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
218 parse_close = parse_close;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
219 build_close = build_close;
8eccd07b619c net/websocket: Add new websocket client code
daurnimator <quae@daurnimator.com>
parents:
diff changeset
220 };