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annotate mod_firewall/actions.lib.lua @ 1242:4d1226220e58

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mod_pubsub_eventsource: Publish only the content of known payload types (JSON, 'data' [from MQTT])
author Matthew Wild <mwild1@gmail.com>
date Mon, 02 Dec 2013 03:07:48 +0000
parents f0108ec2b016
children 8a3f3f485675
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1 local action_handlers = {};
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2
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3
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4 -- Run code through this to allow strings to contain code. e.g.: LOG=Received: $(stanza:top_tag())
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5 local function meta(s, extra)
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6 return (s:gsub("$(%b())", [["..%1.."]])
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7 :gsub("$(%b<>)", [["..stanza:find("%1").."]])
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8 :gsub("$$(%a+)", extra or {}));
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9 end
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10
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11 -- Takes an XML string and returns a code string that builds that stanza
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12 -- using st.stanza()
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13 local function compile_xml(data)
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14 local code = {};
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15 local first, short_close = true, nil;
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16 for tagline, text in data:gmatch("<([^>]+)>([^<]*)") do
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17 if tagline:sub(-1,-1) == "/" then
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18 tagline = tagline:sub(1, -2);
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19 short_close = true;
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20 end
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21 if tagline:sub(1,1) == "/" then
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22 code[#code+1] = (":up()");
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23 else
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24 local name, attr = tagline:match("^(%S*)%s*(.*)$");
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25 local attr_str = {};
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26 for k, _, v in attr:gmatch("(%S+)=([\"'])([^%2]-)%2") do
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27 if #attr_str == 0 then
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28 table.insert(attr_str, ", { ");
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29 else
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30 table.insert(attr_str, ", ");
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31 end
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32 if k:match("^%a%w*$") then
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33 table.insert(attr_str, string.format("%s = %q", k, v));
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34 else
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35 table.insert(attr_str, string.format("[%q] = %q", k, v));
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36 end
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37 end
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38 if #attr_str > 0 then
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39 table.insert(attr_str, " }");
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40 end
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41 if first then
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42 code[#code+1] = (string.format("st.stanza(%q %s)", name, #attr_str>0 and table.concat(attr_str) or ", nil"));
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43 first = nil;
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44 else
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45 code[#code+1] = (string.format(":tag(%q%s)", name, table.concat(attr_str)));
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46 end
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47 end
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48 if text and text:match("%S") then
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49 code[#code+1] = (string.format(":text(%q)", text));
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50 elseif short_close then
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51 short_close = nil;
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52 code[#code+1] = (":up()");
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53 end
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54 end
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55 return table.concat(code, "");
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56 end
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57
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58 function action_handlers.PASS()
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59 return "do return end"
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60 end
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62 function action_handlers.DROP()
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63 return "do return true end";
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64 end
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65
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66 function action_handlers.STRIP(tag_desc)
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67 local code = {};
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68 local name, xmlns = tag_desc:match("^(%S+) (.+)$");
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69 if not name then
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70 name, xmlns = tag_desc, nil;
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71 end
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72 if name == "*" then
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73 name = nil;
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74 end
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75 code[#code+1] = ("local stanza_xmlns = stanza.attr.xmlns; ");
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76 code[#code+1] = "stanza:maptags(function (tag) if ";
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77 if name then
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78 code[#code+1] = ("tag.name == %q and "):format(name);
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79 end
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80 if xmlns then
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81 code[#code+1] = ("(tag.attr.xmlns or stanza_xmlns) == %q "):format(xmlns);
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82 else
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83 code[#code+1] = ("tag.attr.xmlns == stanza_xmlns ");
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84 end
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85 code[#code+1] = "then return nil; end return tag; end );";
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86 return table.concat(code);
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87 end
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88
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89 function action_handlers.INJECT(tag)
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90 return "stanza:add_child("..compile_xml(tag)..")", { "st" };
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91 end
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92
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93 local error_types = {
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94 ["bad-request"] = "modify";
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95 ["conflict"] = "cancel";
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96 ["feature-not-implemented"] = "cancel";
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97 ["forbidden"] = "auth";
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98 ["gone"] = "cancel";
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99 ["internal-server-error"] = "cancel";
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100 ["item-not-found"] = "cancel";
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101 ["jid-malformed"] = "modify";
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102 ["not-acceptable"] = "modify";
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103 ["not-allowed"] = "cancel";
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104 ["not-authorized"] = "auth";
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105 ["payment-required"] = "auth";
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106 ["policy-violation"] = "modify";
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107 ["recipient-unavailable"] = "wait";
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108 ["redirect"] = "modify";
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109 ["registration-required"] = "auth";
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110 ["remote-server-not-found"] = "cancel";
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111 ["remote-server-timeout"] = "wait";
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112 ["resource-constraint"] = "wait";
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113 ["service-unavailable"] = "cancel";
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114 ["subscription-required"] = "auth";
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115 ["undefined-condition"] = "cancel";
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116 ["unexpected-request"] = "wait";
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117 };
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118
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119
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120 local function route_modify(make_new, to, drop)
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121 local reroute, deps = "session.send(newstanza)", { "st" };
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122 if to then
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123 reroute = ("newstanza.attr.to = %q; core_post_stanza(session, newstanza)"):format(to);
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124 deps[#deps+1] = "core_post_stanza";
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125 end
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b729414b4bf1 mod_firewall/actions: Move semicolon as to not produce two in a row. (Not legal in Lua)
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126 return ([[local newstanza = st.%s; %s; %s ]])
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127 :format(make_new, reroute, drop and "return true;" or ""), deps;
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128 end
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129
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130 function action_handlers.BOUNCE(with)
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131 local error = with and with:match("^%S+") or "service-unavailable";
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132 local error_type = error:match(":(%S+)");
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133 if not error_type then
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134 error_type = error_types[error] or "cancel";
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135 else
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136 error = error:match("^[^:]+");
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137 end
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138 error, error_type = string.format("%q", error), string.format("%q", error_type);
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139 local text = with and with:match(" %((.+)%)$");
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140 if text then
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141 text = string.format("%q", text);
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142 else
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143 text = "nil";
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144 end
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145 return route_modify(("error_reply(stanza, %s, %s, %s)"):format(error_type, error, text), nil, true);
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146 end
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147
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148 function action_handlers.REDIRECT(where)
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149 return route_modify("clone(stanza)", where, true);
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150 end
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151
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152 function action_handlers.COPY(where)
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153 return route_modify("clone(stanza)", where, false);
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154 end
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155
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156 function action_handlers.REPLY(with)
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157 return route_modify(("reply(stanza):body(%q)"):format(with));
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158 end
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159
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160 function action_handlers.LOG(string)
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161 local level = string:match("^%[(%a+)%]") or "info";
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162 string = string:gsub("^%[%a+%] ?", "");
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f0108ec2b016 mod_firewall/actions: Break out logic into a separate reusable function
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parents: 960
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163 return meta(("log(%q, %q)"):format(level, string));
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164 end
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165
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166 function action_handlers.RULEDEP(dep)
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167 return "", { dep };
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168 end
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169
960
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
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170 function action_handlers.EVENT(name)
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171 return ("fire_event(%q, event)"):format(name);
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parents: 959
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172 end
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173
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174 function action_handlers.JUMP_EVENT(name)
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175 return ("do return fire_event(%q, event); end"):format(name);
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
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176 end
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177
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178 function action_handlers.JUMP_CHAIN(name)
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parents: 959
diff changeset
179 return ("do return fire_event(%q, event); end"):format("firewall/chains/"..name);
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
diff changeset
180 end
d773a51af9b1 mod_firewall: Add actions EVENT (fire an event), JUMP EVENT (transfer control to the handlers of an event), JUMP CHAIN (transfer control to another mod_firewall chain)
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parents: 959
diff changeset
181
947
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182 return action_handlers;