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--[[
Copyright (c) 2022, Vsevolod Stakhov <vsevolod@rspamd.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
]]--
if confighelp then
return
end
-- Trie is rspamd module designed to define and operate with suffix trie
local N = 'trie'
local rspamd_logger = require "rspamd_logger"
local rspamd_trie = require "rspamd_trie"
local fun = require "fun"
local lua_util = require "lua_util"
local mime_trie
local raw_trie
local body_trie
-- here we store all patterns as text
local mime_patterns = {}
local raw_patterns = {}
local body_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 body_params = {}
local function tries_callback(task)
local matched = {}
local function gen_trie_cb(type)
local patterns = mime_patterns
local params = mime_params
if type == 'rawmessage' then
patterns = raw_patterns
params = raw_params
elseif type == 'rawbody' then
patterns = body_patterns
params = body_params
end
return function(idx, pos)
local param = params[idx]
local pattern = patterns[idx]
local pattern_idx = pattern .. tostring(idx) .. type
if param['multi'] or not matched[pattern_idx] then
lua_util.debugm(N, task, "<%1> matched pattern %2 at pos %3",
task:get_message_id(), pattern, pos)
task:insert_result(param['symbol'], 1.0, type)
if not param['multi'] then
matched[pattern_idx] = true
end
end
end
end
if mime_trie then
mime_trie:search_mime(task, gen_trie_cb('mime'))
end
if raw_trie then
raw_trie:search_rawmsg(task, gen_trie_cb('rawmessage'))
end
if body_trie then
body_trie:search_rawbody(task, gen_trie_cb('rawbody'))
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 })
elseif cf['body'] then
table.insert(body_patterns, pat)
table.insert(body_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)
local file = io.open(cf['file'])
if not file then
rspamd_logger.errx(rspamd_config, 'Cannot open trie file %1', cf['file'])
else
if cf['binary'] then
rspamd_logger.errx(rspamd_config, '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)
if type(cf) ~= 'table' then
rspamd_logger.errx(rspamd_config, 'invalid value for symbol %1: "%2", expected table',
symbol, cf)
return
end
if cf['file'] then
process_trie_file(symbol, cf)
elseif cf['patterns'] then
fun.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(rspamd_config, '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(rspamd_config, 'registered mime search trie from %1 patterns', #mime_patterns)
end
if #body_patterns > 0 then
body_trie = rspamd_trie.create(body_patterns)
rspamd_logger.infox(rspamd_config, 'registered body search trie from %1 patterns', #body_patterns)
end
local id = -1
if mime_trie or raw_trie or body_trie then
id = rspamd_config:register_symbol({
name = 'TRIE_CALLBACK',
type = 'callback',
callback = tries_callback
})
else
rspamd_logger.infox(rspamd_config, 'no tries defined')
end
if id ~= -1 then
for sym in pairs(opts) do
rspamd_config:register_symbol({
name = sym,
type = 'virtual',
parent = id
})
end
end
else
rspamd_logger.infox(rspamd_config, "Module is unconfigured")
lua_util.disable_module(N, "config")
end
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