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--[[
Copyright (c) 2011-2015, Vsevolod Stakhov <vsevolod@highsecure.ru>
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
]]--
-- Trie is rspamd module designed to define and operate with suffix trie
local tries = {}
local rspamd_logger = require "rspamd_logger"
local rspamd_trie = require "rspamd_trie"
local function split(str, delim, maxNb)
-- Eliminate bad cases...
if string.find(str, delim) == nil then
return { str }
end
if maxNb == nil or maxNb < 1 then
maxNb = 0 -- No limit
end
local result = {}
local pat = "(.-)" .. delim .. "()"
local nb = 0
local lastPos
for part, pos in string.gmatch(str, pat) do
nb = nb + 1
result[nb] = part
lastPos = pos
if nb == maxNb then break end
end
-- Handle the last field
if nb ~= maxNb then
result[nb + 1] = string.sub(str, lastPos)
end
return result
end
local function add_trie(params)
local symbol = params[1]
file = io.open(params[2])
if file then
local trie = {}
trie['trie'] = rspamd_trie.create(true)
num = 0
for line in file:lines() do
trie['trie']:add_pattern(line, num)
num = num + 1
end
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(symbol, 1.0)
end
file:close()
trie['symbol'] = symbol
table.insert(tries, trie)
else
local patterns = split(params[2], ',')
local trie = {}
trie['trie'] = rspamd_trie.create(true)
for num,pattern in ipairs(patterns) do
trie['trie']:add_pattern(pattern, num)
end
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(symbol, 1.0)
end
trie['symbol'] = symbol
table.insert(tries, trie)
end
end
function check_trie(task)
for _,trie in ipairs(tries) do
if trie['trie']:search_task(task) then
task:insert_result(trie['symbol'], 1)
return
end
-- Search inside urls
urls = task:get_urls()
if urls then
for _,url in ipairs(urls) do
if trie['trie']:search_text(url:get_text()) then
task:insert_result(trie['symbol'], 1)
return
end
end
end
end
end
-- Registration
if type(rspamd_config.get_api_version) ~= 'nil' then
if rspamd_config:get_api_version() >= 1 then
rspamd_config:register_module_option('trie', 'rule', 'string')
end
end
local opts = rspamd_config:get_all_opt('trie')
if opts then
local strrules = opts['rule']
if strrules then
if type(strrules) == 'table' then
for _,value in ipairs(strrules) do
local params = split(value, ':')
add_trie(params)
end
elseif type(strrules) == 'string' then
local params = split(strrules, ':')
add_trie (params)
end
end
if table.maxn(tries) then
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_callback_symbol('TRIE', 1.0, 'check_trie')
else
rspamd_config:register_symbol('TRIE', 1.0, 'check_trie')
end
end
end
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