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/*
* $Id: libnet_link_snoop.c,v 1.5 2004/01/03 20:31:02 mike Exp $
*
* libnet
* libnet_snoop.c - snoop routines
*
* Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com>
* All rights reserved.
*
* Copyright (c) 1993, 1994, 1995, 1996, 1997
* 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.
*/
#include <sys/param.h>
#include <sys/file.h>
#if (HAVE_CONFIG_H)
#include "../include/config.h"
#endif
#include "../include/libnet.h"
#include <net/raw.h>
#include <net/if.h>
#include <netinet/ip_var.h>
#include <netinet/if_ether.h>
#include <netinet/udp_var.h>
#include <netinet/tcpip.h>
#include "../include/gnuc.h"
#include "../include/bpf.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)
{
int fd;
struct sockaddr_raw sr;
u_int v;
struct libnet_link_int *l;
l = (struct libnet_link_int *)malloc(sizeof(*l));
if (l == NULL)
{
sprintf(ebuf, "malloc: %s", strerror(errno));
return (NULL);
}
memset(l, 0, sizeof(*l));
l->fd = socket(PF_RAW, SOCK_RAW, RAWPROTO_DRAIN);
if (l->fd < 0)
{
sprintf(ebuf, "drain socket: %s", strerror(errno));
goto bad;
}
memset(&sr, 0, sizeof(sr));
sr.sr_family = AF_RAW;
strncpy(sr.sr_ifname, device, sizeof(sr.sr_ifname) - 1);
sr.sr_name[sizeof(sr.sr_name) - 1] = '\0';
if (bind(l->fd, (struct sockaddr *)&sr, sizeof(sr)))
{
sprintf(ebuf, "drain bind: %s", strerror(errno));
goto bad;
}
/*
* XXX hack - map device name to link layer type
*/
if (strncmp("et", device, 2) == 0 || /* Challenge 10 Mbit */
strncmp("ec", device, 2) == 0 || /* Indigo/Indy 10 Mbit, O2 10/100 */
strncmp("ef", device, 2) == 0 || /* O200/2000 10/100 Mbit */
strncmp("gfe", device, 3) == 0 || /* GIO 100 Mbit */
strncmp("fxp", device, 3) == 0 || /* Challenge VME Enet */
strncmp("ep", device, 2) == 0 || /* Challenge 8x10 Mbit EPLEX */
strncmp("vfe", device, 3) == 0 || /* Challenge VME 100Mbit */
strncmp("fa", device, 2) == 0 ||
strncmp("qaa", device, 3) == 0)
{
l->linktype = DLT_EN10MB;
}
else if (strncmp("ipg", device, 3) == 0 ||
strncmp("rns", device, 3) == 0 || /* O2/200/2000 FDDI */
strncmp("xpi", device, 3) == 0)
{
l->linktype = DLT_FDDI;
}
else if (strncmp("ppp", device, 3) == 0) {
l->linktype = DLT_RAW;
} else if (strncmp("lo", device, 2) == 0) {
l->linktype = DLT_NULL;
} else {
sprintf(ebuf, "drain: unknown physical layer type");
goto bad;
}
return (l);
bad:
close(fd);
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,
u_int8_t *buf, int len)
{
int c;
struct ifreq ifr;
struct ether_header *eh = (struct ether_header *)buf;
memset(&ifr, 0, sizeof(ifr));
strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(l->fd, SIOCGIFADDR, &ifr) == -1)
{
perror("ioctl SIOCGIFADDR");
return (-1);
}
memcpy(eh->ether_shost, ifr.ifr_addr.sa_data, sizeof(eh->ether_shost));
if (write(l->fd, buf, len) == -1)
{
/* err */
return (-1);
}
return (len);
}
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