Mon, 04 Jan 2010 17:32:26 +0000
s2smanager: Allow new_outgoing() to create sessions without automatically connecting them (set 3rd parameters to false)
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1 | -- Prosody IM |
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2 | -- Copyright (C) 2009 Tobias Markmann |
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3 | -- |
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4 | -- This project is MIT/X11 licensed. Please see the |
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5 | -- COPYING file in the source package for more information. |
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6 | -- |
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7 | |
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8 | local st = require "util.stanza"; |
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9 | local zlib = require "zlib"; |
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10 | local pcall = pcall; |
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11 | local xmlns_compression_feature = "http://jabber.org/features/compress" |
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12 | local xmlns_compression_protocol = "http://jabber.org/protocol/compress" |
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13 | local xmlns_stream = "http://etherx.jabber.org/streams"; |
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14 | local compression_stream_feature = st.stanza("compression", {xmlns=xmlns_compression_feature}):tag("method"):text("zlib"):up(); |
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15 | |
1676 | 16 | local compression_level = module:get_option("compression_level"); |
17 | -- if not defined assume admin wants best compression | |
18 | if compression_level == nil then compression_level = 9 end; | |
19 | ||
2277 | 20 | |
1676 | 21 | compression_level = tonumber(compression_level); |
22 | if not compression_level or compression_level < 1 or compression_level > 9 then | |
23 | module:log("warn", "Invalid compression level in config: %s", tostring(compression_level)); | |
24 | module:log("warn", "Module loading aborted. Compression won't be available."); | |
25 | return; | |
26 | end | |
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27 | |
1670 | 28 | module:add_event_hook("stream-features", |
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29 | function (session, features) |
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30 | if not session.compressed then |
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31 | -- FIXME only advertise compression support when TLS layer has no compression enabled |
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32 | features:add_child(compression_stream_feature); |
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33 | end |
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34 | end |
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35 | ); |
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36 | |
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37 | module:hook("s2s-stream-features", |
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38 | function (data) |
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39 | local session, features = data.session, data.features; |
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40 | -- FIXME only advertise compression support when TLS layer has no compression enabled |
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41 | if not session.compressed then |
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42 | features:add_child(compression_stream_feature); |
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43 | end |
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44 | end |
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45 | ); |
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46 | |
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47 | -- Hook to activate compression if remote server supports it. |
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48 | module:hook_stanza(xmlns_stream, "features", |
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49 | function (session, stanza) |
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50 | if not session.compressed then |
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51 | -- does remote server support compression? |
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52 | local comp_st = stanza:child_with_name("compression"); |
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53 | if comp_st then |
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54 | -- do we support the mechanism |
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55 | for a in comp_st:children() do |
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56 | local algorithm = a[1] |
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57 | if algorithm == "zlib" then |
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58 | session.sends2s(st.stanza("compress", {xmlns=xmlns_compression_protocol}):tag("method"):text("zlib")) |
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59 | session.log("info", "Enabled compression using zlib.") |
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60 | return true; |
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61 | end |
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62 | end |
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63 | session.log("debug", "Remote server supports no compression algorithm we support.") |
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64 | end |
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65 | end |
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66 | end |
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67 | , 250); |
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68 | |
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69 | |
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70 | -- returns either nil or a fully functional ready to use inflate stream |
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71 | local function get_deflate_stream(session) |
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72 | local status, deflate_stream = pcall(zlib.deflate, compression_level); |
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73 | if status == false then |
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74 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"); |
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75 | (session.sends2s or session.send)(error_st); |
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76 | session.log("error", "Failed to create zlib.deflate filter."); |
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77 | module:log("error", deflate_stream); |
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78 | return |
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79 | end |
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80 | return deflate_stream |
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81 | end |
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82 | |
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83 | -- returns either nil or a fully functional ready to use inflate stream |
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84 | local function get_inflate_stream(session) |
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85 | local status, inflate_stream = pcall(zlib.inflate); |
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86 | if status == false then |
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87 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("setup-failed"); |
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88 | (session.sends2s or session.send)(error_st); |
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89 | session.log("error", "Failed to create zlib.deflate filter."); |
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90 | module:log("error", inflate_stream); |
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91 | return |
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92 | end |
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93 | return inflate_stream |
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94 | end |
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95 | |
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96 | -- setup compression for a stream |
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97 | local function setup_compression(session, deflate_stream) |
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98 | local old_send = (session.sends2s or session.send); |
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99 | |
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100 | local new_send = function(t) |
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101 | --TODO: Better code injection in the sending process |
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102 | session.log(t) |
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103 | local status, compressed, eof = pcall(deflate_stream, tostring(t), 'sync'); |
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104 | if status == false then |
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105 | session:close({ |
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106 | condition = "undefined-condition"; |
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107 | text = compressed; |
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108 | extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed"); |
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109 | }); |
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110 | module:log("warn", compressed); |
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111 | return; |
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112 | end |
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113 | session.conn:write(compressed); |
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114 | end; |
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115 | |
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116 | if session.sends2s then session.sends2s = new_send |
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117 | elseif session.send then session.send = new_send end |
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118 | end |
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119 | |
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120 | -- setup decompression for a stream |
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121 | local function setup_decompression(session, inflate_stream) |
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122 | local old_data = session.data |
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123 | session.data = function(conn, data) |
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124 | local status, decompressed, eof = pcall(inflate_stream, data); |
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125 | if status == false then |
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126 | session:close({ |
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127 | condition = "undefined-condition"; |
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128 | text = decompressed; |
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129 | extra = st.stanza("failure", {xmlns="http://jabber.org/protocol/compress"}):tag("processing-failed"); |
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130 | }); |
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131 | module:log("warn", decompressed); |
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132 | return; |
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133 | end |
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134 | old_data(conn, decompressed); |
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135 | end; |
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136 | end |
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137 | |
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138 | module:add_handler({"s2sout_unauthed", "s2sout"}, "compressed", xmlns_compression_protocol, |
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139 | function(session ,stanza) |
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140 | session.log("debug", "Activating compression...") |
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141 | -- create deflate and inflate streams |
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142 | local deflate_stream = get_deflate_stream(session); |
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143 | if not deflate_stream then return end |
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144 | |
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145 | local inflate_stream = get_inflate_stream(session); |
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146 | if not inflate_stream then return end |
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147 | |
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148 | -- setup compression for session.w |
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149 | setup_compression(session, deflate_stream); |
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150 | |
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151 | -- setup decompression for session.data |
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152 | setup_decompression(session, inflate_stream); |
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153 | local session_reset_stream = session.reset_stream; |
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154 | session.reset_stream = function(session) |
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155 | session_reset_stream(session); |
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156 | setup_decompression(session, inflate_stream); |
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157 | return true; |
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158 | end; |
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159 | session:reset_stream(); |
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160 | local default_stream_attr = {xmlns = "jabber:server", ["xmlns:stream"] = "http://etherx.jabber.org/streams", |
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161 | ["xmlns:db"] = 'jabber:server:dialback', version = "1.0", to = session.to_host, from = session.from_host}; |
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162 | session.sends2s("<?xml version='1.0'?>"); |
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163 | session.sends2s(st.stanza("stream:stream", default_stream_attr):top_tag()); |
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164 | session.compressed = true; |
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165 | end |
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166 | ); |
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167 | |
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168 | module:add_handler({"c2s_unauthed", "c2s", "s2sin_unauthed", "s2sin"}, "compress", xmlns_compression_protocol, |
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169 | function(session, stanza) |
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170 | -- fail if we are already compressed |
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171 | if session.compressed then |
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172 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); |
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173 | (session.sends2s or session.send)(error_st); |
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175 | end |
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176 | |
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177 | -- checking if the compression method is supported |
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178 | local method = stanza:child_with_name("method")[1]; |
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179 | if method == "zlib" then |
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180 | session.log("debug", method.." compression selected."); |
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181 | |
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182 | -- create deflate and inflate streams |
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183 | local deflate_stream = get_deflate_stream(session); |
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184 | if not deflate_stream then return end |
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185 | |
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186 | local inflate_stream = get_inflate_stream(session); |
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187 | if not inflate_stream then return end |
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188 | |
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189 | (session.sends2s or session.send)(st.stanza("compressed", {xmlns=xmlns_compression_protocol})); |
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190 | session:reset_stream(); |
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191 | |
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192 | -- setup compression for session.w |
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193 | setup_compression(session, deflate_stream); |
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194 | |
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195 | -- setup decompression for session.data |
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196 | setup_decompression(session, inflate_stream); |
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197 | |
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198 | local session_reset_stream = session.reset_stream; |
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199 | session.reset_stream = function(session) |
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200 | session_reset_stream(session); |
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201 | setup_decompression(session, inflate_stream); |
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202 | return true; |
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203 | end; |
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204 | session.compressed = true; |
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205 | else |
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206 | session.log("warn", method.." compression selected. But we don't support it."); |
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207 | local error_st = st.stanza("failure", {xmlns=xmlns_compression_protocol}):tag("unsupported-method"); |
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208 | (session.sends2s or session.send)(error_st); |
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209 | end |
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210 | end |
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211 | ); |
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212 |