policy TLS_FORWARD: improve error reporting for invalid parameters

modules/policy/policy.lua

@@ -128,20 +128,25 @@ local function forward(target)
 	end
 end
 
--- Forward request and all subrequests to upstream over TCP; validate answers
+-- Forward request and all subrequests to upstream over TLS; validate answers
 local function tls_forward(target)
 	local sockaddr_list = {}
 	local addr_list = {}
 	local ca_files = {}
 	local hostnames = {}
 	local pins = {}
-	if type(target) ~= 'table' then
-		assert(false, 'wrong TLS_FORWARD target')
+	if type(target) ~= 'table' or #target < 1 then
+		error('TLS_FORWARD argument must be a non-empty table')
 	end
-	for _, upstream_list_entry in pairs(target) do
+	for idx, upstream_list_entry in pairs(target) do
+		if type(upstream_list_entry) ~= 'table' then
+			error('TLS_FORWARD target must be a non-empty table (found '
+			      .. type(upstream_list_entry) .. ' at position ' .. idx .. ')')
+		end
 		local upstream_addr = upstream_list_entry[1]
 		if type(upstream_addr) ~= 'string' then
-			assert(false, 'bad IP address in TLS_FORWARD target')
+			error('TLS_FORWARD target must start with an IP address (found '
+			      .. type(upstream_addr) .. ' at the beginning of target position ' .. idx .. ')')
 		end
 		table.insert(sockaddr_list, addr2sock(upstream_addr, 853))
 		table.insert(addr_list, upstream_addr)

modules/policy/policy_test.lua

@@ -7,7 +7,8 @@ modules = { 'policy' }
 local function test_tls_forward()
 	boom(policy.TLS_FORWARD, {}, 'TLS_FORWARD without arguments')
 	boom(policy.TLS_FORWARD, {'1'}, 'TLS_FORWARD with non-table argument')
-	-- boom(policy.TLS_FORWARD, {{}}, 'TLS_FORWARD with empty table')
+	boom(policy.TLS_FORWARD, {{}}, 'TLS_FORWARD with empty table')
+	boom(policy.TLS_FORWARD, {{{}}}, 'TLS_FORWARD with empty target table')
 	boom(policy.TLS_FORWARD, {{{bleble=''}}}, 'TLS_FORWARD with invalid parameters in table')
 
 	boom(policy.TLS_FORWARD, {{'1'}}, 'TLS_FORWARD with invalid IP address')
@@ -16,13 +17,13 @@ local function test_tls_forward()
 
 	-- boom(policy.TLS_FORWARD, {{{'::1', pin=''}}}, 'TLS_FORWARD with empty pin')
 	-- boom(policy.TLS_FORWARD, {{{'::1', pin='č'}}}, 'TLS_FORWARD with bad pin')
-	ok(policy.TLS_FORWARD, {{{'::1', pin='ZTNiMGM0NDI5OGZjMWMxNDlhZmJmNGM4OTk2ZmI5MjQyN2FlNDFlNDY0OWI5MzRjYTQ5NTk5MWI3ODUyYjg1NQ=='}}}, 'TLS_FORWARD with base64 pin')
-	ok(policy.TLS_FORWARD, {{{'::1', pin={
+	ok(policy.TLS_FORWARD({{'::1', pin='ZTNiMGM0NDI5OGZjMWMxNDlhZmJmNGM4OTk2ZmI5MjQyN2FlNDFlNDY0OWI5MzRjYTQ5NTk5MWI3ODUyYjg1NQ=='}}), 'TLS_FORWARD with base64 pin')
+	ok(policy.TLS_FORWARD({{'::1', pin={
 					'ZTNiMGM0NDI5OGZjMWMxNDlhZmJmNGM4OTk2ZmI5MjQyN2FlNDFlNDY0OWI5MzRjYTQ5NTk5MWI3ODUyYjg1NQ==',
 					'MTcwYWUzMGNjZDlmYmE2MzBhZjhjZGE2ODQxZTAwYzZiNjU3OWNlYzc3NmQ0MTllNzAyZTIwYzY5YzQ4OGZmOA=='
-				}}}}, 'TLS_FORWARD with table of pins')
+				}}}), 'TLS_FORWARD with table of pins')
 
-	ok(policy.TLS_FORWARD, {{{'::1', hostname='test.', ca='/tmp/ca.crt'}}}, 'TLS_FORWARD with hostname + CA cert')
+	ok(policy.TLS_FORWARD({{'::1', hostname='test.', ca='/tmp/ca.crt'}}), 'TLS_FORWARD with hostname + CA cert')
 	-- boom(policy.TLS_FORWARD, {{{'::1', hostname='test.'}}}, 'TLS_FORWARD with just hostname')
 	-- boom(policy.TLS_FORWARD, {{{'::1', ca='/tmp/ca.crt'}}}, 'TLS_FORWARD with just CA cert')
 	-- boom(policy.TLS_FORWARD, {{{'::1', hostname='', ca='/tmp/ca.crt'}}}, 'TLS_FORWARD with invalid hostname + CA cert')