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-- 0 or 1 received: = spam
local symbol = 'ONCE_RECEIVED'
-- Symbol for strict checks
local symbol_strict = nil
local bad_hosts = {}
local good_hosts = {}
local function check_quantity_received (task)
local function recv_dns_cb(resolver, to_resolve, results, err)
task:inc_dns_req()
if not results then
task:insert_result(symbol_strict, 1)
else
rspamd_logger.info(string.format('SMTP resolver failed to resolve: %s is %s', to_resolve, results[1]))
local i = true
for _,h in ipairs(bad_hosts) do
if string.find(results[1], h) then
-- Check for good hostname
if good_hosts then
for _,gh in ipairs(good_hosts) do
if string.find(results[1], gh) then
i = false
break
end
end
end
if i then
task:insert_result(symbol_strict, 1, h)
return
end
end
end
end
end
local recvh = task:get_received_headers()
if table.maxn(recvh) <= 1 then
task:insert_result(symbol, 1)
-- Strict checks
if symbol_strict then
local r = recvh[1]
if not r then
return
end
-- Unresolved host
if not r['real_hostname'] or string.lower(r['real_hostname']) == 'unknown' or
string.match(r['real_hostname'], '^%d+%.%d+%.%d+%.%d+$') then
if r['real_ip'] then
-- Try to resolve it again
task:get_resolver():resolve_ptr(task:get_session(), task:get_mempool(),
tostring(r['real_ip']), recv_dns_cb)
else
task:insert_result(symbol_strict, 1)
end
return
end
local i = true
local hn = string.lower(r['real_hostname'])
for _,h in ipairs(bad_hosts) do
if string.find(hn, h) then
-- Check for good hostname
if good_hosts then
for _,gh in ipairs(good_hosts) do
if string.find(hn, gh) then
i = false
break
end
end
end
if i then
task:insert_result(symbol_strict, 1, h)
return
end
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('once_received', 'symbol', 'string')
rspamd_config:register_module_option('once_received', 'symbol_strict', 'string')
rspamd_config:register_module_option('once_received', 'bad_host', 'string')
rspamd_config:register_module_option('once_received', 'good_host', 'string')
end
end
-- Configuration
local opts = rspamd_config:get_all_opt('once_received')
if opts then
if opts['symbol'] then
local symbol = opts['symbol']
for n,v in pairs(opts) do
if n == 'symbol_strict' then
symbol_strict = v
if type(rspamd_config.get_api_version) ~= 'nil' then
rspamd_config:register_virtual_symbol(symbol_strict, 1.0)
end
elseif n == 'bad_host' then
if type(v) == 'string' then
bad_hosts[1] = v
else
bad_hosts = v
end
elseif n == 'good_host' then
if type(v) == 'string' then
good_hosts[1] = v
else
good_hosts = v
end
end
end
-- Register symbol's callback
rspamd_config:register_symbol(symbol, 1.0, check_quantity_received)
end
end
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