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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.
]]--
local rspamd_tcp = require "rspamd_tcp"
local lua_util = require "lua_util"
local exports = {}
local CRLF = '\r\n'
local default_timeout = 10.0
--[[[
-- @function lua_smtp.sendmail(task, message, opts, callback)
--]]
local function sendmail(opts, message, callback)
local stage = 'connect'
local function mail_cb(err, data, conn)
local function no_error_write(merr)
if merr then
callback(false, string.format('error on stage %s: %s',
stage, merr))
if conn then
conn:close()
end
return false
end
return true
end
local function no_error_read(merr, mdata, wantcode)
wantcode = wantcode or '2'
if merr then
callback(false, string.format('error on stage %s: %s',
stage, merr))
if conn then
conn:close()
end
return false
end
if mdata then
if type(mdata) ~= 'string' then
mdata = tostring(mdata)
end
if string.sub(mdata, 1, 1) ~= wantcode then
callback(false, string.format('bad smtp response on stage %s: "%s" when "%s" expected',
stage, mdata, wantcode))
if conn then
conn:close()
end
return false
end
else
callback(false, string.format('no data on stage %s',
stage))
if conn then
conn:close()
end
return false
end
return true
end
-- After quit
local function all_done_cb(merr, mdata)
if conn then
conn:close()
end
callback(true, nil)
return true
end
-- QUIT stage
local function quit_done_cb(_, _)
conn:add_read(all_done_cb, CRLF)
end
local function quit_cb(merr, mdata)
if no_error_read(merr, mdata) then
conn:add_write(quit_done_cb, 'QUIT' .. CRLF)
end
end
local function pre_quit_cb(merr, _)
if no_error_write(merr) then
stage = 'quit'
conn:add_read(quit_cb, CRLF)
end
end
-- DATA stage
local function data_done_cb(merr, mdata)
if no_error_read(merr, mdata, '3') then
if type(message) == 'string' or type(message) == 'userdata' then
conn:add_write(pre_quit_cb, { message, CRLF .. '.' .. CRLF })
else
table.insert(message, CRLF .. '.' .. CRLF)
conn:add_write(pre_quit_cb, message)
end
end
end
local function data_cb(merr, _)
if no_error_write(merr) then
conn:add_read(data_done_cb, CRLF)
end
end
-- RCPT phase
local next_recipient
local function rcpt_done_cb_gen(i)
return function(merr, mdata)
if no_error_read(merr, mdata) then
if i == #opts.recipients then
conn:add_write(data_cb, 'DATA' .. CRLF)
else
next_recipient(i + 1)
end
end
end
end
local function rcpt_cb_gen(i)
return function(merr, _)
if no_error_write(merr, '2') then
conn:add_read(rcpt_done_cb_gen(i), CRLF)
end
end
end
next_recipient = function(i)
conn:add_write(rcpt_cb_gen(i),
string.format('RCPT TO: <%s>%s', opts.recipients[i], CRLF))
end
-- FROM stage
local function from_done_cb(merr, mdata)
-- We need to iterate over recipients sequentially
if no_error_read(merr, mdata, '2') then
stage = 'rcpt'
next_recipient(1)
end
end
local function from_cb(merr, _)
if no_error_write(merr) then
conn:add_read(from_done_cb, CRLF)
end
end
local function hello_done_cb(merr, mdata)
if no_error_read(merr, mdata) then
stage = 'from'
conn:add_write(from_cb, string.format(
'MAIL FROM: <%s>%s', opts.from, CRLF))
end
end
-- HELO stage
local function hello_cb(merr)
if no_error_write(merr) then
conn:add_read(hello_done_cb, CRLF)
end
end
if no_error_read(err, data) then
stage = 'helo'
conn:add_write(hello_cb, string.format('HELO %s%s',
opts.helo, CRLF))
end
end
if type(opts.recipients) == 'string' then
opts.recipients = { opts.recipients }
end
local tcp_opts = lua_util.shallowcopy(opts)
tcp_opts.stop_pattern = CRLF
tcp_opts.timeout = opts.timeout or default_timeout
tcp_opts.callback = mail_cb
if not rspamd_tcp.request(tcp_opts) then
callback(false, 'cannot make a TCP connection')
end
end
exports.sendmail = sendmail
return exports
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