IOS Jailbreak How do intercept SMS / Text Messages -

i'm trying write application intercepts text messages , reacts depending on content of message. tried hook _receivedmessage:(struct __cksmsrecord *)message replace:(bool)replace method in cksmsservice class seems not called @ all.

could please tell me function/class have hook in? need intercept text message before gets displayed , stored database. i'm on ios 5.0.1.

any appreciated.

this code snippet should intercept sms messages- can extend other kinds of notifications. work on ios 5.0.1 well. not work imessages though. link coretelephony framework (there bunch of private headers there you'd can class-dump)

#include <dlfcn.h>  #define coretelpath "/system/library/privateframeworks/coretelephony.framework/coretelephony" id(*cttelephonycentergetdefault)();  void (*cttelephonycenteraddobserver) (id,id,cfnotificationcallback,nsstring*,void*,int);   static void telephonyeventcallback(cfnotificationcenterref center, void *observer, cfstringref name, const void *object, cfdictionaryref userinfo) {     nsstring *notifyname=(nsstring *)name;     if ([notifyname isequaltostring:@"kctmessagereceivednotification"])//received sms     {         nslog(@" sms notification received :kctmessagereceivednotification");         // blocking here.      } }  -(void) registercallback {   void *handle = dlopen(coretelpath, rtld_lazy);     cttelephonycentergetdefault = dlsym(handle, "cttelephonycentergetdefault");     cttelephonycenteraddobserver = dlsym(handle,"cttelephonycenteraddobserver");     dlclose(handle);     id ct = cttelephonycentergetdefault();      cttelephonycenteraddobserver(                                  ct,                                   null,                                   telephonyeventcallback,                                  null,                                  null,                                  cfnotificationsuspensionbehaviordeliverimmediately); }