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/*
* $Id: libnet_link_pf.c,v 1.3 2004/01/03 20:31:02 mike Exp $
*
* libnet
* libnet_pf.c - pf routines
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* All rights reserved.
*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the University of California,
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
* the University nor the names of its contributors may be used to endorse
* or promote products derived from this software without specific prior
* written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* packet filter subroutines for tcpdump
* Extraction/creation by Jeffrey Mogul, DECWRL
*/
#include "common.h"
#include "../include/gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "../include/os-proto.h"
#endif
struct libnet_link_int *
libnet_open_link_interface(int8_t *device, int8_t *ebuf)
{
register struct libnet_link_int *l;
int16_t enmode;
int backlog = -1; /* request the most */
struct enfilter Filter;
struct endevp devparams;
l = (struct libnet_link_int *)malloc(sizeof(*l));
if (l == NULL)
{
sprintf(ebuf, "libnet_open_link_int: %s", strerror(errno));
return (0);
}
memset(l, 0, sizeof(*l));
l->fd = pfopen(device, O_RDWR);
if (l->fd < 0)
{
sprintf(ebuf, "pf open: %s: %s\n\your system may not be properly configured; see \"man packetfilter(4)\"",
device, strerror(errno));
goto bad;
}
enmode = ENTSTAMP|ENBATCH|ENNONEXCL;
if (ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode) < 0)
{
sprintf(ebuf, "EIOCMBIS: %s", strerror(errno));
goto bad;
}
#ifdef ENCOPYALL
/* Try to set COPYALL mode so that we see packets to ourself */
enmode = ENCOPYALL;
ioctl(l->fd, EIOCMBIS, (caddr_t)&enmode); /* OK if this fails */
#endif
/* set the backlog */
if (ioctl(l->fd, EIOCSETW, (caddr_t)&backlog) < 0)
{
sprintf(ebuf, "EIOCSETW: %s", strerror(errno));
goto bad;
}
/*
* discover interface type
*/
if (ioctl(l->fd, EIOCDEVP, (caddr_t)&devparams) < 0)
{
sprintf(ebuf, "EIOCDEVP: %s", strerror(errno));
goto bad;
}
/* HACK: to compile prior to Ultrix 4.2 */
#ifndef ENDT_FDDI
#define ENDT_FDDI 4
#endif
switch (devparams.end_dev_type)
{
case ENDT_10MB:
l->linktype = DLT_EN10MB;
break;
case ENDT_FDDI:
l->linktype = DLT_FDDI;
break;
default:
/*
* XXX
* Currently, the Ultrix packet filter supports only
* Ethernet and FDDI. Eventually, support for SLIP and PPP
* (and possibly others: T1?) should be added.
*/
l->linktype = DLT_EN10MB;
break;
}
/*
* acceptag all packets
*/
bzero((int8_t *)&Filter, sizeof(Filter));
Filter.enf_Priority = 37; /* anything > 2 */
Filter.enf_FilterLen = 0; /* means "always true" */
if (ioctl(l->fd, EIOCSETF, (caddr_t)&Filter) < 0)
{
sprintf(ebuf, "EIOCSETF: %s", strerror(errno));
goto bad;
}
return (l);
bad:
free(l);
return (NULL);
}
int
libnet_close_link_interface(struct libnet_link_int *l)
{
if (close(l->fd) == 0)
{
free(l);
return (1);
}
else
{
free(l);
return (-1);
}
}
int
libnet_write_link_layer(struct libnet_link_int *l, const int8_t *device,
const uint8_t *buf, int len)
{
int c;
c = write(l->fd, buf, len);
if (c != len)
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"libnet_write_link: %d bytes written (%s)", c,
strerror(errno));
}
return (c);
}
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