Stop further socket() or connect() calls.

Daan Vreeken [PA4DAN] Danovitsch at
Wed Jul 5 09:39:49 UTC 2006

On Wednesday 05 July 2006 03:15, mal content wrote:
> On 03/07/06, Peter Jeremy <peterjeremy at> wrote:
> > For dynamic executables, you could LD_PRELOAD a .so that replaces
> > all the socket-related syscalls.
> Excellent suggestion! Ok, I've created a basic .so file with the following
> code, but I've basically got stuck because I don't know how the original
> syscalls are defined and can't find the definitions in the source:
> ---
> #include <sys/syscall.h>
> #include <sys/types.h>
> #include <sys/socket.h>
> int socket(int d, int t, int prot)
> {
>   return __syscall(SYS_socket, d, t, prot);
> }
> [ ... ]

Wouldn't this still allow a program to open sockets when the program does the 
__syscall() dance for itself instead of relying on socket() to work?
I have never tried MAC myself, so correct me if I'm wrong, but I think 
something like this could be done using a modified version of mac_portacl(4).


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