#include <linux/module.h>
#include <linux/init.h>
#include <linux/in.h>
#include <linux/inet.h>
#include <net/sock.h>

#define SERVERPORT 5555
static struct socket *clientsocket=NULL;

static int __init client_init( void )
{
  int len;
  char buf[64];
  struct msghdr msg;
  struct iovec iov;
  mm_segment_t oldfs;
  struct sockaddr_in to;

  if( sock_create( PF_INET,SOCK_DGRAM,IPPROTO_UDP,&clientsocket)<0 ) {
    printk( KERN_ERR "server: Error creating clientsocket.\n" );
    return -EIO;
  }
  to.sin_family = AF_INET;
  to.sin_addr.s_addr = in_aton( "127.0.0.1" ); /* destination address */
  to.sin_port = htons( (unsigned short)SERVERPORT );

  msg.msg_name = &to;
  msg.msg_namelen = sizeof(to);
  memcpy( buf, "hallo", 6 );
  iov.iov_base = buf;
  iov.iov_len  = 6;
  msg.msg_control = NULL;
  msg.msg_controllen = 0;
  msg.msg_iov	 = &iov;
  msg.msg_iovlen = 1;

  oldfs = get_fs(); 
  set_fs( KERNEL_DS );
  len = sock_sendmsg( clientsocket, &msg, 6 );
  set_fs( oldfs );
  if( len < 0 )
    printk( KERN_ERR "sock_sendmsg returned: %d\n", len);
  return 0;
}

static void __exit client_exit( void )
{
  if( clientsocket )
    sock_release( clientsocket );
}

module_init( client_init );
module_exit( client_exit );
MODULE_LICENSE("GPL");