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annotate etc/tftp.lua @ 0:4b915342e2a8

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LuaSocket 2.0.2 + CMake build description.
author Eric Wing <ewing . public |-at-| gmail . com>
date Tue, 26 Aug 2008 18:40:01 -0700
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4b915342e2a8 LuaSocket 2.0.2 + CMake build description.
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1 -----------------------------------------------------------------------------
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2 -- TFTP support for the Lua language
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3 -- LuaSocket toolkit.
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4 -- Author: Diego Nehab
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5 -- RCS ID: $Id: tftp.lua,v 1.16 2005/11/22 08:33:29 diego Exp $
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6 -----------------------------------------------------------------------------
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7
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8 -----------------------------------------------------------------------------
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9 -- Load required files
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10 -----------------------------------------------------------------------------
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11 local base = _G
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12 local table = require("table")
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13 local math = require("math")
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14 local string = require("string")
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15 local socket = require("socket")
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16 local ltn12 = require("ltn12")
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17 local url = require("socket.url")
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18 module("socket.tftp")
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19
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20 -----------------------------------------------------------------------------
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21 -- Program constants
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22 -----------------------------------------------------------------------------
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23 local char = string.char
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24 local byte = string.byte
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25
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26 PORT = 69
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27 local OP_RRQ = 1
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28 local OP_WRQ = 2
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29 local OP_DATA = 3
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30 local OP_ACK = 4
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31 local OP_ERROR = 5
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32 local OP_INV = {"RRQ", "WRQ", "DATA", "ACK", "ERROR"}
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33
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34 -----------------------------------------------------------------------------
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35 -- Packet creation functions
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36 -----------------------------------------------------------------------------
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37 local function RRQ(source, mode)
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38 return char(0, OP_RRQ) .. source .. char(0) .. mode .. char(0)
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39 end
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40
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41 local function WRQ(source, mode)
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42 return char(0, OP_RRQ) .. source .. char(0) .. mode .. char(0)
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43 end
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44
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45 local function ACK(block)
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46 local low, high
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47 low = math.mod(block, 256)
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48 high = (block - low)/256
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49 return char(0, OP_ACK, high, low)
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50 end
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51
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52 local function get_OP(dgram)
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53 local op = byte(dgram, 1)*256 + byte(dgram, 2)
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54 return op
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55 end
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56
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57 -----------------------------------------------------------------------------
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58 -- Packet analysis functions
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59 -----------------------------------------------------------------------------
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60 local function split_DATA(dgram)
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61 local block = byte(dgram, 3)*256 + byte(dgram, 4)
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62 local data = string.sub(dgram, 5)
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63 return block, data
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64 end
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65
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66 local function get_ERROR(dgram)
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67 local code = byte(dgram, 3)*256 + byte(dgram, 4)
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68 local msg
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69 _,_, msg = string.find(dgram, "(.*)\000", 5)
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70 return string.format("error code %d: %s", code, msg)
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71 end
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72
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73 -----------------------------------------------------------------------------
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74 -- The real work
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75 -----------------------------------------------------------------------------
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76 local function tget(gett)
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77 local retries, dgram, sent, datahost, dataport, code
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78 local last = 0
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79 socket.try(gett.host, "missing host")
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80 local con = socket.try(socket.udp())
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81 local try = socket.newtry(function() con:close() end)
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82 -- convert from name to ip if needed
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83 gett.host = try(socket.dns.toip(gett.host))
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84 con:settimeout(1)
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85 -- first packet gives data host/port to be used for data transfers
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86 local path = string.gsub(gett.path or "", "^/", "")
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87 path = url.unescape(path)
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88 retries = 0
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89 repeat
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90 sent = try(con:sendto(RRQ(path, "octet"), gett.host, gett.port))
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91 dgram, datahost, dataport = con:receivefrom()
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92 retries = retries + 1
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93 until dgram or datahost ~= "timeout" or retries > 5
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94 try(dgram, datahost)
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95 -- associate socket with data host/port
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96 try(con:setpeername(datahost, dataport))
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97 -- default sink
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98 local sink = gett.sink or ltn12.sink.null()
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99 -- process all data packets
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100 while 1 do
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101 -- decode packet
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102 code = get_OP(dgram)
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103 try(code ~= OP_ERROR, get_ERROR(dgram))
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104 try(code == OP_DATA, "unhandled opcode " .. code)
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105 -- get data packet parts
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106 local block, data = split_DATA(dgram)
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107 -- if not repeated, write
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108 if block == last+1 then
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109 try(sink(data))
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110 last = block
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111 end
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112 -- last packet brings less than 512 bytes of data
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113 if string.len(data) < 512 then
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114 try(con:send(ACK(block)))
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115 try(con:close())
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116 try(sink(nil))
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117 return 1
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118 end
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119 -- get the next packet
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120 retries = 0
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121 repeat
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122 sent = try(con:send(ACK(last)))
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123 dgram, err = con:receive()
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124 retries = retries + 1
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125 until dgram or err ~= "timeout" or retries > 5
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126 try(dgram, err)
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127 end
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128 end
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129
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130 local default = {
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131 port = PORT,
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132 path ="/",
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133 scheme = "tftp"
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134 }
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135
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136 local function parse(u)
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137 local t = socket.try(url.parse(u, default))
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138 socket.try(t.scheme == "tftp", "invalid scheme '" .. t.scheme .. "'")
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139 socket.try(t.host, "invalid host")
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140 return t
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141 end
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142
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143 local function sget(u)
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144 local gett = parse(u)
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145 local t = {}
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146 gett.sink = ltn12.sink.table(t)
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147 tget(gett)
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148 return table.concat(t)
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149 end
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150
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151 get = socket.protect(function(gett)
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152 if base.type(gett) == "string" then return sget(gett)
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153 else return tget(gett) end
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154 end)
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155