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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 rspamd_logger = require "rspamd_logger"
local rspamd_trie = require "rspamd_trie"
local _ = require "fun"
local mime_trie
local raw_trie
-- here we store all patterns as text
local mime_patterns = {}
local raw_patterns = {}
-- here we store params for each pattern, so for each i = 1..n patterns[i]
-- should have corresponding params[i]
local mime_params = {}
local raw_params = {}
local function tries_callback(task)
local matched = {}
local function gen_trie_cb(raw)
local patterns = mime_patterns
local params = mime_params
if raw then
patterns = raw_patterns
params = raw_params
end
return function (idx, pos)
local param = params[idx]
local pattern = patterns[idx]
if param['multi'] or not matched[pattern] then
rspamd_logger.debugx("<%1> matched pattern %2 at pos %3",
task:get_message_id(), pattern, pos)
task:insert_result(param['symbol'], 1.0)
if not param['multi'] then
matched[pattern] = true
end
end
end
end
if mime_trie then
mime_trie:search_mime(task, gen_trie_cb(false))
end
if raw_trie then
raw_trie:search_rawmsg(task, gen_trie_cb(true))
end
end
local function process_single_pattern(pat, symbol, cf)
if pat then
local multi = false
if cf['multi'] then multi = true end
if cf['raw'] then
table.insert(raw_patterns, pat)
table.insert(raw_params, {symbol=symbol, multi=multi})
else
table.insert(mime_patterns, pat)
table.insert(mime_params, {symbol=symbol, multi=multi})
end
end
end
local function process_trie_file(symbol, cf)
file = io.open(cf['file'])
if not file then
rspamd_logger.errx('Cannot open trie file %1', cf['file'])
else
if cf['binary'] then
rspamd_logger.errx('binary trie patterns are not implemented yet: %1',
cf['file'])
else
for line in file:lines() do
local pat = string.match(line, '^([^#].*[^%s])%s*$')
process_single_pattern(pat, symbol, cf)
end
end
end
end
local function process_trie_conf(symbol, cf)
local raw = false
if type(cf) ~= 'table' then
rspamd_logger.errx('invalid value for symbol %1: "%2", expected table',
symbol, cf)
return
end
if cf['raw'] then raw = true end
if cf['file'] then
process_trie_file(symbol, cf)
elseif cf['patterns'] then
_.each(function(pat)
process_single_pattern(pat, symbol, cf)
end, cf['patterns'])
end
end
local opts = rspamd_config:get_all_opt("trie")
if opts then
for sym, opt in pairs(opts) do
process_trie_conf(sym, opt)
end
if #raw_patterns > 0 then
raw_trie = rspamd_trie.create(raw_patterns)
rspamd_logger.infox('registered raw search trie from %1 patterns', #raw_patterns)
end
if #mime_patterns > 0 then
mime_trie = rspamd_trie.create(mime_patterns)
rspamd_logger.infox('registered mime search trie from %1 patterns', #mime_patterns)
end
local id = -1
if mime_trie or raw_trie then
id = rspamd_config:register_callback_symbol('TRIE', 1.0, tries_callback)
else
rspamd_logger.err('no tries defined')
end
if id ~= -1 then
for sym, opt in pairs(opts) do
rspamd_config:register_virtual_symbol(sym, 1.0, id)
end
end
end
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