misc: examples kemi, don't fail if optional modules are not loaded

kamailio-basic-kemi.cfg has some define instructions that can be
removed ( WITH_MYSQL, WITH_AUTH, ...)

So lets make sure that modules are there in the lua script before
using the defined routes.

diff --git a/misc/examples/kemi/kamailio-basic-kemi-lua.lua b/misc/examples/kemi/kamailio-basic-kemi-lua.lua
index 44a0918..b28eea0 100644 (file)
--- a/misc/examples/kemi/kamailio-basic-kemi-lua.lua
+++ b/misc/examples/kemi/kamailio-basic-kemi-lua.lua
@@ -240,8 +240,11 @@ end
 
 -- IP authorization and user uthentication
 function ksr_route_auth()
+       if not KSR.auth then
+               return 1;
+       end
 
-       if not KSR.is_REGISTER() then
+       if KSR.permissions and not KSR.is_REGISTER() then
                if KSR.permissions.allow_source_address(1)>0 then
                        -- source IP allowed
                        return 1;
@@ -273,6 +276,9 @@ end
 
 -- Caller NAT detection
 function ksr_route_natdetect()
+       if not KSR.nathelper then
+               return 1;
+       end
        KSR.force_rport();
        if KSR.nathelper.nat_uac_test(19)>0 then
                if KSR.is_REGISTER() then
@@ -287,6 +293,9 @@ end
 
 -- RTPProxy control
 function ksr_route_natmanage()
+       if not KSR.rtpproxy then
+               return 1;
+       end
        if KSR.siputils.is_request()>0 then
                if KSR.siputils.has_totag()>0 then
                        if KSR.rr.check_route_param("nat=yes")>0 then
@@ -317,6 +326,9 @@ end
 
 -- URI update for dialog requests
 function ksr_route_dlguri()
+       if not KSR.nathelper then
+               return 1;
+       end
        if not KSR.isdsturiset() then
                KSR.nathelper.handle_ruri_alias();
        end