How to hook socket or connect

[d6638219]

Use fishhook in the simulator hook to connect and socket, but not in the iphone hook.

`static int (*orig_socket)(int, int, int);
static int (*orig_connect)(int, const struct sockaddr *, socklen_t);
int my_socket(int domain, int type, int protocol)
{
printf("this is my socket!");
return orig_socket(domain,type,protocol);;
}
int my_connect(int socket, const struct sockaddr * addr, socklen_t len)
{
printf("this is my connect");
return orig_connect(socket,addr,len);
}
int main(int argc, char * argv[])
{
@autoreleasepool {
rebind_symbols((struct rebinding[2]){{"connect", my_connect, (void *)&orig_connect},{"socket", my_socket, (void *)&orig_socket}}, 2);
return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
}
}

`

[kastiglione]

People have had issues with socket and/or connect in the past. One problem is that fishhook can only hook external calls, which means function calls within the same library generally cannot be hooked. In this case, calls to socket and connect from within the same library (libSystem) cannot be hooked. With the simulator, the system libraries are broken out into many sub-libraries, including libsystem_networking. With many sub-libraries, this means function calls from one sub-library to another can be hooked on the simulator, but on device where there's just a single libSystem, those same calls are within the same library and cannot be hooked.

[waitianlou]

Is there any inspiration how to hook connect in libSystem? inline hook can not work on un jailbreaking system. may be there is another way?

[luckyCity]

@kastiglione @waitianlou Looking forward to yours, thinks

[BackWorld]

+1