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--[[
Copyright (c) 2018, Vsevolod Stakhov <vsevolod@highsecure.ru>
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 exports = {}
local logger = require 'rspamd_logger'
-- Squeezed rules part
local squeezed_rules = {{}} -- plain vector of all rules squeezed
local squeezed_symbols = {} -- indexed by name of symbol
local squeezed_deps = {} -- squeezed deps
local squeezed_rdeps = {} -- squeezed reverse deps
local SN = 'lua_squeeze'
local squeeze_sym = 'LUA_SQUEEZE'
local squeeze_function_ids = {}
local function gen_lua_squeeze_function(order)
return function(task)
for _,data in ipairs(squeezed_rules[order]) do
local ret = {data[1](task)}
if #ret ~= 0 then
local first = ret[1]
local sym = data[2]
-- Function has returned something, so it is rule, not a plugin
if type(first) == 'boolean' then
if first then
table.remove(ret, 1)
if type(ret[1]) == 'table' then
task:insert_result(sym, 1.0, ret[1])
else
task:insert_result(sym, 1.0, ret)
end
end
elseif type(first) == 'number' then
table.remove(ret, 1)
if first ~= 0 then
task:insert_result(sym, first, ret)
end
else
task:insert_result(sym, 1.0, ret)
end
end
end
end
end
exports.squeeze_rule = function(s, func)
if s then
if not squeezed_symbols[s] then
squeezed_symbols[s] = {
cb = func,
order = 0,
sym = s,
}
logger.debugm(SN, rspamd_config, 'squeezed rule: %s', s)
else
logger.warnx(rspamd_config, 'duplicate symbol registered: %s, skip', s)
end
else
-- Unconditionally add function to the squeezed rules
local id = tostring(#squeezed_rules)
logger.debugm(SN, rspamd_config, 'squeezed unnamed rule: %s', id)
table.insert(squeezed_rules[1], {func, 'unnamed: ' .. id})
end
if not squeeze_function_ids[1] then
squeeze_function_ids[1] = rspamd_config:register_symbol{
type = 'callback',
callback = gen_lua_squeeze_function(1),
name = squeeze_sym,
description = 'Meta rule for Lua rules that can be squeezed',
no_squeeze = true, -- to avoid infinite recursion
}
end
return squeeze_function_ids[1]
end
exports.squeeze_dependency = function(child, parent)
logger.debugm(SN, rspamd_config, 'squeeze dep %s->%s', child, parent)
if not squeezed_deps[parent] then
squeezed_deps[parent] = {}
end
if not squeezed_deps[parent][child] then
squeezed_deps[parent][child] = true
else
logger.warnx(rspamd_config, 'duplicate dependency %s->%s', child, parent)
end
if not squeezed_rdeps[child] then
squeezed_rdeps[child] = {}
end
if not squeezed_rdeps[child][parent] then
squeezed_rdeps[child][parent] = true
end
return true
end
local function get_ordered_symbol_name(order)
if order == 1 then
return squeeze_sym
end
return squeeze_sym .. tostring(order)
end
local function register_topology_symbol(order)
local ord_sym = get_ordered_symbol_name(order)
squeeze_function_ids[order] = rspamd_config:register_symbol{
type = 'callback',
callback = gen_lua_squeeze_function(order),
name = ord_sym,
description = 'Meta rule for Lua rules that can be squeezed, order ' .. tostring(order),
no_squeeze = true, -- to avoid infinite recursion
}
local parent = get_ordered_symbol_name(order - 1)
logger.debugm(SN, rspamd_config, 'registered new order of deps: %s->%s',
ord_sym, parent)
rspamd_config:register_dependency(ord_sym, parent, true)
end
exports.squeeze_init = function()
-- Do topological sorting
for _,v in pairs(squeezed_symbols) do
local function visit(node, order)
if order > node.order then
node.order = order
logger.debugm(SN, rspamd_config, "symbol: %s, order: %s", node.sym, order)
else
return
end
if squeezed_deps[node.sym] then
for dep,_ in pairs(squeezed_deps[node.sym]) do
if squeezed_symbols[dep] then
visit(squeezed_symbols[dep], order + 1)
end
end
end
end
if v.order == 0 then
visit(v, 1)
end
end
for parent,children in pairs(squeezed_deps) do
if not squeezed_symbols[parent] then
-- Trivial case, external dependnency
logger.debugm(SN, rspamd_config, 'register external squeezed dependency on %s',
parent)
rspamd_config:register_dependency(squeeze_sym, parent, true)
else
-- Not so trivial case
local ps = squeezed_symbols[parent]
for cld,_ in pairs(children) do
if squeezed_symbols[cld] then
-- Cross dependency
logger.debugm(SN, rspamd_config, 'cross dependency in squeezed symbols %s->%s',
cld, parent)
local order = squeezed_symbols[cld].order
if not squeeze_function_ids[order] then
-- Need to register new callback symbol to handle deps
for i = 1, order do
if not squeeze_function_ids[i] then
register_topology_symbol(i)
end
end
end
else
-- External symbol depends on a squeezed one
local parent_symbol = get_ordered_symbol_name(ps.order)
rspamd_config:register_dependency(cld, parent_symbol, true)
logger.debugm(SN, rspamd_config, 'register squeezed dependency for external symbol %s->%s',
cld, parent_symbol)
end
end
end
end
-- We have now all deps being registered, so we can register virtual symbols
-- and create squeezed rules
for k,v in pairs(squeezed_symbols) do
local parent_symbol = get_ordered_symbol_name(v.order)
logger.debugm(SN, rspamd_config, 'added squeezed rule: %s (%s)', k, parent_symbol)
rspamd_config:register_symbol{
type = 'virtual',
name = k,
parent = squeeze_function_ids[v.order],
no_squeeze = true, -- to avoid infinite recursion
}
if not squeezed_rules[v.order] then
squeezed_rules[v.order] = {}
end
table.insert(squeezed_rules[v.order], {v.cb,k})
end
end
return exports
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