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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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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
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2 "http://www.w3.org/TR/html4/strict.dtd">
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3 <html>
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4
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5 <head>
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6 <meta name="description" content="LuaSocket: FTP support">
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7 <meta name="keywords" content="Lua, LuaSocket, FTP, Network, Library, Support">
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8 <title>LuaSocket: FTP support</title>
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9 <link rel="stylesheet" href="reference.css" type="text/css">
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10 </head>
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11
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12 <body>
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13
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14 <!-- header ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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15
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16 <div class=header>
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17 <hr>
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18 <center>
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19 <table summary="LuaSocket logo">
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20 <tr><td align=center><a href="http://www.lua.org">
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21 <img width=128 height=128 border=0 alt="LuaSocket" src="luasocket.png">
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22 </a></td></tr>
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23 <tr><td align=center valign=top>Network support for the Lua language
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24 </td></tr>
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25 </table>
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26 <p class=bar>
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27 <a href="home.html">home</a> &middot;
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28 <a href="home.html#download">download</a> &middot;
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29 <a href="installation.html">installation</a> &middot;
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30 <a href="introduction.html">introduction</a> &middot;
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31 <a href="reference.html">reference</a>
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32 </p>
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33 </center>
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34 <hr>
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35 </div>
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36
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37 <!-- ftp ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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38
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39 <h2 id=ftp>FTP</h2>
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40
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41 <p>
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42 FTP (File Transfer Protocol) is a protocol used to transfer files
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43 between hosts. The <tt>ftp</tt> namespace offers thorough support
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44 to FTP, under a simple interface. The implementation conforms to
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45 <a href="http://www.cs.princeton.edu/~diego/rfc/rfc0959.txt">RFC 959</a>.
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46 </p>
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47
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48 <p>
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49 High level functions are provided supporting the most common operations.
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50 These high level functions are implemented on top of a lower level
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51 interface. Using the low-level interface, users can easily create their
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52 own functions to access <em>any</em> operation supported by the FTP
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53 protocol. For that, check the implementation.
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54 </p>
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55
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56 <p>
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57 To really benefit from this module, a good understanding of
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58 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">
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59 LTN012, Filters sources and sinks</a> is necessary.
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60 </p>
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61
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62 <p>
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63 To obtain the <tt>ftp</tt> namespace, run:
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64 </p>
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65
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66 <pre class=example>
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67 -- loads the FTP module and any libraries it requires
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68 local ftp = require("socket.ftp")
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69 </pre>
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70
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71 <p>
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72 URLs MUST conform to
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73 <a href="http://www.cs.princeton.edu/~diego/rfc/rfc1738.txt">RFC
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74 1738</a>, that is, an URL is a string in the form:
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75 </p>
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76
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77 <blockquote>
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78 <tt>
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79 [ftp://][&lt;user&gt;[:&lt;password&gt;]@]&lt;host&gt;[:&lt;port&gt;][/&lt;path&gt;][<i>type</i>=a|i]</tt>
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80 </blockquote>
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81
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82 <p>
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83 The following constants in the namespace can be set to control the default behavior of
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84 the FTP module:
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85 </p>
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86
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87 <ul>
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88 <li> <tt>PASSWORD</tt>: default anonymous password.
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89 <li> <tt>PORT</tt>: default port used for the control connection;
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90 <li> <tt>TIMEOUT</tt>: sets the timeout for all I/O operations;
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91 <li> <tt>USER</tt>: default anonymous user;
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92 </ul>
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93
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94
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95 <!-- ftp.get ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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96
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97 <p class=name id=get>
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98 ftp.<b>get(</b>url<b>)</b><br>
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99 ftp.<b>get{</b><br>
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100 &nbsp;&nbsp;host = <i>string</i>,<br>
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101 &nbsp;&nbsp;sink = <i>LTN12 sink</i>,<br>
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102 &nbsp;&nbsp;argument <i>or</i> path = <i>string</i>,<br>
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103 &nbsp;&nbsp;[user = <i>string</i>,]<br>
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104 &nbsp;&nbsp;[password = <i>string</i>]<br>
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105 &nbsp;&nbsp;[command = <i>string</i>,]<br>
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106 &nbsp;&nbsp;[port = <i>number</i>,]<br>
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107 &nbsp;&nbsp;[type = <i>string</i>,]<br>
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108 &nbsp;&nbsp;[step = <i>LTN12 pump step</i>,]<br>
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109 &nbsp;&nbsp;[create = <i>function</i>]<br>
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110 <b>}</b>
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111 </p>
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112
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113 <p class=description>
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114 The <tt>get</tt> function has two forms. The simple form has fixed
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115 functionality: it downloads the contents of a URL and returns it as a
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116 string. The generic form allows a <em>lot</em> more control, as explained
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117 below.
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118 </p>
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119
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120 <p class=parameters>
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121 If the argument of the <tt>get</tt> function is a table, the function
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122 expects at least the fields <tt>host</tt>, <tt>sink</tt>, and one of
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123 <tt>argument</tt> or <tt>path</tt> (<tt>argument</tt> takes
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124 precedence). <tt>Host</tt> is the server to connect to. <tt>Sink</tt> is
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125 the <em>simple</em>
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126 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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127 sink that will receive the downloaded data. <tt>Argument</tt> or
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128 <tt>path</tt> give the target path to the resource in the server. The
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129 optional arguments are the following:
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130 </p>
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131 <ul>
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132 <li><tt>user</tt>, <tt>password</tt>: User name and password used for
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133 authentication. Defaults to "<tt>ftp:anonymous@anonymous.org</tt>";
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134 <li><tt>command</tt>: The FTP command used to obtain data. Defaults to
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135 "<tt>retr</tt>", but see example below;
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136 <li><tt>port</tt>: The port to used for the control connection. Defaults to 21;
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137 <li><tt>type</tt>: The transfer mode. Can take values "<tt>i</tt>" or
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138 "<tt>a</tt>". Defaults to whatever is the server default;
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139 <li><tt>step</tt>:
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140 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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141 pump step function used to pass data from the
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142 server to the sink. Defaults to the LTN12 <tt>pump.step</tt> function;
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143 <li><tt>create</tt>: An optional function to be used instead of
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144 <a href=tcp.html#socket.tcp><tt>socket.tcp</tt></a> when the communications socket is created.
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145 </ul>
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146
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147 <p class=return>
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148 If successful, the simple version returns the URL contents as a
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149 string, and the generic function returns 1. In case of error, both
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150 functions return <b><tt>nil</tt></b> and an error message describing the
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151 error.
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152 </p>
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153
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154 <pre class=example>
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155 -- load the ftp support
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156 local ftp = require("socket.ftp")
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157
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158 -- Log as user "anonymous" on server "ftp.tecgraf.puc-rio.br",
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159 -- and get file "lua.tar.gz" from directory "pub/lua" as binary.
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160 f, e = ftp.get("ftp://ftp.tecgraf.puc-rio.br/pub/lua/lua.tar.gz;type=i")
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161 </pre>
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162
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163 <pre class=example>
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164 -- load needed modules
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165 local ftp = require("socket.ftp")
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166 local ltn12 = require("ltn12")
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167 local url = require("socket.url")
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168
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169 -- a function that returns a directory listing
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170 function nlst(u)
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171 local t = {}
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172 local p = url.parse(u)
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173 p.command = "nlst"
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174 p.sink = ltn12.sink.table(t)
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175 local r, e = ftp.get(p)
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176 return r and table.concat(t), e
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177 end
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178 </pre>
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179
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180 <!-- put ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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181
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182 <p class=name id=put>
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183 ftp.<b>put(</b>url, content<b>)</b><br>
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184 ftp.<b>put{</b><br>
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185 &nbsp;&nbsp;host = <i>string</i>,<br>
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186 &nbsp;&nbsp;source = <i>LTN12 sink</i>,<br>
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187 &nbsp;&nbsp;argument <i>or</i> path = <i>string</i>,<br>
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188 &nbsp;&nbsp;[user = <i>string</i>,]<br>
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189 &nbsp;&nbsp;[password = <i>string</i>]<br>
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190 &nbsp;&nbsp;[command = <i>string</i>,]<br>
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191 &nbsp;&nbsp;[port = <i>number</i>,]<br>
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192 &nbsp;&nbsp;[type = <i>string</i>,]<br>
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193 &nbsp;&nbsp;[step = <i>LTN12 pump step</i>,]<br>
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194 &nbsp;&nbsp;[create = <i>function</i>]<br>
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195 <b>}</b>
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196 </p>
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197
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198 <p class=description>
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199 The <tt>put</tt> function has two forms. The simple form has fixed
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200 functionality: it uploads a string of content into a URL. The generic form
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201 allows a <em>lot</em> more control, as explained below.
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202 </p>
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203
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204 <p class=parameters>
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205 If the argument of the <tt>put</tt> function is a table, the function
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206 expects at least the fields <tt>host</tt>, <tt>source</tt>, and one of
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207 <tt>argument</tt> or <tt>path</tt> (<tt>argument</tt> takes
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208 precedence). <tt>Host</tt> is the server to connect to. <tt>Source</tt> is
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209 the <em>simple</em>
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210 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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211 source that will provide the contents to be uploaded.
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212 <tt>Argument</tt> or
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213 <tt>path</tt> give the target path to the resource in the server. The
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214 optional arguments are the following:
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215 </p>
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216 <ul>
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217 <li><tt>user</tt>, <tt>password</tt>: User name and password used for
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218 authentication. Defaults to "<tt>ftp:anonymous@anonymous.org</tt>";
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219 <li><tt>command</tt>: The FTP command used to send data. Defaults to
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220 "<tt>stor</tt>", but see example below;
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221 <li><tt>port</tt>: The port to used for the control connection. Defaults to 21;
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222 <li><tt>type</tt>: The transfer mode. Can take values "<tt>i</tt>" or
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223 "<tt>a</tt>". Defaults to whatever is the server default;
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224 <li><tt>step</tt>:
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225 <a href="http://lua-users.org/wiki/FiltersSourcesAndSinks">LTN12</a>
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226 pump step function used to pass data from the
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227 server to the sink. Defaults to the LTN12 <tt>pump.step</tt> function;
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228 <li><tt>create</tt>: An optional function to be used instead of
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229 <a href=tcp.html#socket.tcp><tt>socket.tcp</tt></a> when the communications socket is created.
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230 </ul>
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231
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232 <p class=return>
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233 Both functions return 1 if successful, or <b><tt>nil</tt></b> and an error
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234 message describing the reason for failure.
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235 </p>
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236
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237 <pre class=example>
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238 -- load the ftp support
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239 local ftp = require("socket.ftp")
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240
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241 -- Log as user "fulano" on server "ftp.example.com",
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242 -- using password "silva", and store a file "README" with contents
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243 -- "wrong password, of course"
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244 f, e = ftp.put("ftp://fulano:silva@ftp.example.com/README",
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245 "wrong password, of course")
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246 </pre>
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247
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248 <pre class=example>
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249 -- load the ftp support
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250 local ftp = require("socket.ftp")
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251 local ltn12 = require("ltn12")
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252
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253 -- Log as user "fulano" on server "ftp.example.com",
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254 -- using password "silva", and append to the remote file "LOG", sending the
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255 -- contents of the local file "LOCAL-LOG"
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256 f, e = ftp.put{
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257 host = "ftp.example.com",
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258 user = "fulano",
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259 password = "silva",
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260 command = "appe",
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261 argument = "LOG",
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262 source = ltn12.source.file(io.open("LOCAL-LOG", "r"))
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263 }
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264 </pre>
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265
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266
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267 <!-- footer +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ -->
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268
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269 <div class=footer>
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270 <hr>
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271 <center>
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272 <p class=bar>
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273 <a href="home.html">home</a> &middot;
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274 <a href="home.html#download">download</a> &middot;
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275 <a href="installation.html">installation</a> &middot;
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276 <a href="introduction.html">introduction</a> &middot;
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277 <a href="reference.html">reference</a>
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278 </p>
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279 <p>
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280 <small>
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281 Last modified by Diego Nehab on <br>
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282 Thu Apr 20 00:25:18 EDT 2006
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283 </small>
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284 </p>
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285 </center>
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286 </div>
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287
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288 </body>
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289 </html>