From owner-freebsd-hackers@FreeBSD.ORG  Wed Jul  5 01:15:49 2006
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Message-ID: <8e96a0b90607041815s7888cf7areb5244247b9bdb53@mail.gmail.com>
Date: Wed, 5 Jul 2006 02:15:44 +0100
From: "mal content" <artifact.one@googlemail.com>
To: "Peter Jeremy" <peterjeremy@optushome.com.au>
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	<20060703190448.GD727@turion.vk2pj.dyndns.org>
Cc: freebsd-hackers@freebsd.org
Subject: Re: Stop further socket() or connect() calls.
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On 03/07/06, Peter Jeremy <peterjeremy@optushome.com.au> 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);
}
int connect(int s, const struct sockaddr *sa, socklen_t len)
{
  return __syscall(SYS_connect, s, sa, len);
}
int bind(int s, const struct sockaddr *sa, socklen_t len)
{
  return __syscall(SYS_bind, s, sa, len);
}
int listen(int s, int bl)
{
  return __syscall(SYS_listen, s, bl);
}
---

This doesn't work, it causes various runtime errors.

Where are the system calls defined in the source? I could just
copy the definitions.

cheers
MC