电话监听私有api

gistfile1.m

#include <dlfcn.h>
typedef  CFNotificationCenterRef (*fpCFNotificationCenterRef)(void);
typedef  void (*fpCTTelephonyCenterAddObserver)(CFNotificationCenterRef center, const void *observer, CFNotificationCallback callBack, CFStringRef name, const void *object, CFNotificationSuspensionBehavior suspensionBehavior);
void callback(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo);

int install_callback()
{
    void *framework = dlopen("/System/Library/Frameworks/CoreTelephony.framework/CoreTelephony", RTLD_LAZY);
    fpCFNotificationCenterRef CTTelephonyCenterGetDefault = (fpCFNotificationCenterRef)dlsym(framework, "CTTelephonyCenterGetDefault");
    if (CTTelephonyCenterGetDefault == NULL) {
        return 1;
    }
    CFNotificationCenterRef ct = CTTelephonyCenterGetDefault();
    fpCTTelephonyCenterAddObserver CTTelephonyCenterAddObserver = (fpCTTelephonyCenterAddObserver)dlsym(framework, "CTTelephonyCenterAddObserver");
    if (CTTelephonyCenterAddObserver == NULL) {
        return 1;
    }
    CTTelephonyCenterAddObserver(ct, NULL, callback, NULL, NULL, CFNotificationSuspensionBehaviorHold);
    dlclose(framework);
    return 0;
}

void callback(CFNotificationCenterRef center, void *observer, CFStringRef name_, const void *object, CFDictionaryRef userInfo_)
{
    NSString *name = (NSString *)name_;
    NSDictionary *info = (NSDictionary *)userInfo_;
    
    NSLog(@"Notification intercepted: %s %@\n", [name UTF8String], info);
    if([name isEqualToString:@"kCTCallStatusChangeNotification"] && info)
    {
        NSString *state=[[info objectForKey:@"kCTCallStatus"] stringValue];
        // 拨出电话时为３，有呼入电话时为４，挂断电话时为５
        int callState = [state intValue];
    }
}