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/* pcap-util.c
* Utility routines for packet capture
*
* $Id: pcap-util.c,v 1.18 2003/10/10 03:00:10 guy Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@ethereal.com>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_LIBPCAP
#include <glib.h>
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <pcap.h>
#include "pcap-util.h"
#include "pcap-util-int.h"
/*
* Get the data-link type for a libpcap device.
* This works around AIX 5.x's non-standard and incompatible-with-the-
* rest-of-the-universe libpcap.
*/
int
get_pcap_linktype(pcap_t *pch, char *devname
#ifndef AIX
_U_
#endif
)
{
int linktype;
#ifdef AIX
char *ifacename;
#endif
linktype = pcap_datalink(pch);
#ifdef AIX
/*
* The libpcap that comes with AIX 5.x uses RFC 1573 ifType values
* rather than DLT_ values for link-layer types; the ifType values
* for LAN devices are:
*
* Ethernet 6
* 802.3 7
* Token Ring 9
* FDDI 15
*
* and the ifType value for a loopback device is 24.
*
* The AIX names for LAN devices begin with:
*
* Ethernet en
* 802.3 et
* Token Ring tr
* FDDI fi
*
* and the AIX names for loopback devices begin with "lo".
*
* (The difference between "Ethernet" and "802.3" is presumably
* whether packets have an Ethernet header, with a packet type,
* or an 802.3 header, with a packet length, followed by an 802.2
* header and possibly a SNAP header.)
*
* If the device name matches "linktype" interpreted as an ifType
* value, rather than as a DLT_ value, we will assume this is AIX's
* non-standard, incompatible libpcap, rather than a standard libpcap,
* and will map the link-layer type to the standard DLT_ value for
* that link-layer type, as that's what the rest of Ethereal expects.
*
* (This means the capture files won't be readable by a tcpdump
* linked with AIX's non-standard libpcap, but so it goes. They
* *will* be readable by standard versions of tcpdump, Ethereal,
* and so on.)
*
* XXX - if we conclude we're using AIX libpcap, should we also
* set a flag to cause us to assume the time stamps are in
* seconds-and-nanoseconds form, and to convert them to
* seconds-and-microseconds form before processing them and
* writing them out?
*/
/*
* Find the last component of the device name, which is the
* interface name.
*/
ifacename = strchr(devname, '/');
if (ifacename == NULL)
ifacename = devnames;
/* See if it matches any of the LAN device names. */
if (strncmp(ifacename, "en", 2) == 0) {
if (linktype == 6) {
/*
* That's the RFC 1573 value for Ethernet; map it
* to DLT_EN10MB.
*/
linktype = 1;
}
} else if (strncmp(ifacename, "et", 2) == 0) {
if (linktype == 7) {
/*
* That's the RFC 1573 value for 802.3; map it to
* DLT_EN10MB.
* (libpcap, tcpdump, Ethereal, etc. don't care if
* it's Ethernet or 802.3.)
*/
linktype = 1;
}
} else if (strncmp(ifacename, "tr") == 0) {
if (linktype == 9) {
/*
* That's the RFC 1573 value for 802.5 (Token Ring);
* map it to DLT_IEEE802, which is what's used for
* Token Ring.
*/
linktype = 6;
}
} else if (strncmp(ifacename, "fi") == 0) {
if (linktype == 15) {
/*
* That's the RFC 1573 value for FDDI; map it to
* DLT_FDDI.
*/
linktype = 10;
}
} else if (strncmp(ifacename, "lo") == 0) {
if (linktype == 24) {
/*
* That's the RFC 1573 value for "software loopback"
* devices; map it to DLT_NULL, which is what's used
* for loopback devices on BSD.
*/
linktype = 0;
}
}
#endif
return linktype;
}
if_info_t *
if_info_new(char *name, char *description)
{
if_info_t *if_info;
if_info = g_malloc(sizeof (if_info_t));
if_info->name = g_strdup(name);
if (description == NULL)
if_info->description = NULL;
else
if_info->description = g_strdup(description);
return if_info;
}
#ifdef HAVE_PCAP_FINDALLDEVS
GList *
get_interface_list_findalldevs(int *err, char *err_str)
{
GList *il = NULL;
pcap_if_t *alldevs, *dev;
if_info_t *if_info;
if (pcap_findalldevs(&alldevs, err_str) == -1) {
*err = CANT_GET_INTERFACE_LIST;
return NULL;
}
if (alldevs == NULL) {
/*
* No interfaces found.
*/
*err = NO_INTERFACES_FOUND;
return NULL;
}
for (dev = alldevs; dev != NULL; dev = dev->next) {
if_info = if_info_new(dev->name, dev->description);
il = g_list_append(il, if_info);
}
pcap_freealldevs(alldevs);
return il;
}
#endif /* HAVE_PCAP_FINDALLDEVS */
static void
free_if_cb(gpointer data, gpointer user_data _U_)
{
if_info_t *if_info = data;
g_free(if_info->name);
if (if_info->description != NULL)
g_free(if_info->description);
}
void
free_interface_list(GList *if_list)
{
g_list_foreach(if_list, free_if_cb, NULL);
g_list_free(if_list);
}
#endif /* HAVE_LIBPCAP */
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