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wireshark/capture-pcap-util.c

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/* capture-pcap-util.c
* Utility routines for packet capture
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* 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 <stdio.h>
#include <limits.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 <wtap.h>
#include <libpcap.h>
#include "capture_ifinfo.h"
#include "capture-pcap-util.h"
#include "capture-pcap-util-int.h"
#ifndef _WIN32
#include <netinet/in.h>
#endif
/*
* 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, const char *devname
#ifndef _AIX
_U_
#endif
)
{
int linktype;
#ifdef _AIX
const 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 Wireshark 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, Wireshark,
* 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 = devname;
/* 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, Wireshark, etc. don't care if
* it's Ethernet or 802.3.)
*/
linktype = 1;
}
} else if (strncmp(ifacename, "tr", 2) == 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", 2) == 0) {
if (linktype == 15) {
/*
* That's the RFC 1573 value for FDDI; map it to
* DLT_FDDI.
*/
linktype = 10;
}
} else if (strncmp(ifacename, "lo", 2) == 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 = (if_info_t *)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);
if_info->addrs = NULL;
if_info->loopback = FALSE;
return if_info;
}
void
if_info_add_address(if_info_t *if_info, struct sockaddr *addr)
{
if_addr_t *if_addr;
struct sockaddr_in *ai;
#ifdef INET6
struct sockaddr_in6 *ai6;
#endif
switch (addr->sa_family) {
case AF_INET:
ai = (struct sockaddr_in *)addr;
if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
if_addr->ifat_type = IF_AT_IPv4;
if_addr->addr.ip4_addr =
*((guint32 *)&(ai->sin_addr.s_addr));
if_info->addrs = g_slist_append(if_info->addrs, if_addr);
break;
#ifdef INET6
case AF_INET6:
ai6 = (struct sockaddr_in6 *)addr;
if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
if_addr->ifat_type = IF_AT_IPv6;
memcpy((void *)&if_addr->addr.ip6_addr,
(void *)&ai6->sin6_addr.s6_addr,
sizeof if_addr->addr.ip6_addr);
if_info->addrs = g_slist_append(if_info->addrs, if_addr);
break;
#endif
}
}
#ifdef HAVE_PCAP_FINDALLDEVS
/*
* Get all IP address information, and the loopback flag, for the given
* interface.
*/
static void
if_info_ip(if_info_t *if_info, pcap_if_t *d)
{
pcap_addr_t *a;
/* Loopback flag */
if_info->loopback = (d->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE;
/* All addresses */
for (a = d->addresses; a != NULL; a = a->next) {
if (a->addr != NULL)
if_info_add_address(if_info, a->addr);
}
}
#ifdef HAVE_PCAP_REMOTE
GList *
get_interface_list_findalldevs_ex(const char *source,
struct pcap_rmtauth *auth,
int *err, char **err_str)
{
GList *il = NULL;
pcap_if_t *alldevs, *dev;
if_info_t *if_info;
char errbuf[PCAP_ERRBUF_SIZE];
if (pcap_findalldevs_ex((char *)source, auth, &alldevs, errbuf) == -1) {
*err = CANT_GET_INTERFACE_LIST;
if (err_str != NULL)
*err_str = cant_get_if_list_error_message(errbuf);
return NULL;
}
if (alldevs == NULL) {
/*
* No interfaces found.
*/
*err = NO_INTERFACES_FOUND;
if (err_str != NULL)
*err_str = NULL;
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);
if_info_ip(if_info, dev);
}
pcap_freealldevs(alldevs);
return il;
}
#endif
GList *
get_interface_list_findalldevs(int *err, char **err_str)
{
GList *il = NULL;
pcap_if_t *alldevs, *dev;
if_info_t *if_info;
char errbuf[PCAP_ERRBUF_SIZE];
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
*err = CANT_GET_INTERFACE_LIST;
if (err_str != NULL)
*err_str = cant_get_if_list_error_message(errbuf);
return NULL;
}
if (alldevs == NULL) {
/*
* No interfaces found.
*/
*err = NO_INTERFACES_FOUND;
if (err_str != NULL)
*err_str = NULL;
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);
if_info_ip(if_info, dev);
}
pcap_freealldevs(alldevs);
return il;
}
#endif /* HAVE_PCAP_FINDALLDEVS */
static void
free_if_info_addr_cb(gpointer addr, gpointer user_data _U_)
{
g_free(addr);
}
static void
free_if_cb(gpointer data, gpointer user_data _U_)
{
if_info_t *if_info = (if_info_t *)data;
g_free(if_info->name);
g_free(if_info->description);
g_slist_foreach(if_info->addrs, free_if_info_addr_cb, NULL);
g_slist_free(if_info->addrs);
g_free(if_info);
}
void
free_interface_list(GList *if_list)
{
g_list_foreach(if_list, free_if_cb, NULL);
g_list_free(if_list);
}
#if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
struct dlt_choice {
const char *name;
const char *description;
int dlt;
};
#define DLT_CHOICE(code, description) { #code, description, code }
#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
static struct dlt_choice dlt_choices[] = {
DLT_CHOICE(DLT_NULL, "BSD loopback"),
DLT_CHOICE(DLT_EN10MB, "Ethernet"),
DLT_CHOICE(DLT_IEEE802, "Token ring"),
DLT_CHOICE(DLT_ARCNET, "ARCNET"),
DLT_CHOICE(DLT_SLIP, "SLIP"),
DLT_CHOICE(DLT_PPP, "PPP"),
DLT_CHOICE(DLT_FDDI, "FDDI"),
DLT_CHOICE(DLT_ATM_RFC1483, "RFC 1483 IP-over-ATM"),
DLT_CHOICE(DLT_RAW, "Raw IP"),
DLT_CHOICE(DLT_SLIP_BSDOS, "BSD/OS SLIP"),
DLT_CHOICE(DLT_PPP_BSDOS, "BSD/OS PPP"),
DLT_CHOICE(DLT_ATM_CLIP, "Linux Classical IP-over-ATM"),
DLT_CHOICE(DLT_PPP_SERIAL, "PPP over serial"),
DLT_CHOICE(DLT_PPP_ETHER, "PPPoE"),
DLT_CHOICE(DLT_C_HDLC, "Cisco HDLC"),
DLT_CHOICE(DLT_IEEE802_11, "802.11"),
DLT_CHOICE(DLT_FRELAY, "Frame Relay"),
DLT_CHOICE(DLT_LOOP, "OpenBSD loopback"),
DLT_CHOICE(DLT_ENC, "OpenBSD encapsulated IP"),
DLT_CHOICE(DLT_LINUX_SLL, "Linux cooked"),
DLT_CHOICE(DLT_LTALK, "Localtalk"),
DLT_CHOICE(DLT_PFLOG, "OpenBSD pflog file"),
DLT_CHOICE(DLT_PRISM_HEADER, "802.11 plus Prism header"),
DLT_CHOICE(DLT_IP_OVER_FC, "RFC 2625 IP-over-Fibre Channel"),
DLT_CHOICE(DLT_SUNATM, "Sun raw ATM"),
DLT_CHOICE(DLT_IEEE802_11_RADIO, "802.11 plus BSD radio information header"),
DLT_CHOICE(DLT_APPLE_IP_OVER_IEEE1394, "Apple IP-over-IEEE 1394"),
DLT_CHOICE(DLT_ARCNET_LINUX, "Linux ARCNET"),
DLT_CHOICE(DLT_LINUX_IRDA, "Linux IrDA"),
DLT_CHOICE(DLT_IEEE802_11_RADIO_AVS, "802.11 plus AVS radio information header"),
DLT_CHOICE_SENTINEL
};
#if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL)
static int
pcap_datalink_name_to_val(const char *name)
{
int i;
for (i = 0; dlt_choices[i].name != NULL; i++) {
if (g_ascii_strcasecmp(dlt_choices[i].name + sizeof("DLT_") - 1,
name) == 0)
return (dlt_choices[i].dlt);
}
return (-1);
}
#endif /* defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) */
#if !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME)
static const char *
pcap_datalink_val_to_name(int dlt)
{
int i;
for (i = 0; dlt_choices[i].name != NULL; i++) {
if (dlt_choices[i].dlt == dlt)
return (dlt_choices[i].name + sizeof("DLT_") - 1);
}
return (NULL);
}
#endif /* defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) */
#if !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
const char *
pcap_datalink_val_to_description(int dlt)
{
int i;
for (i = 0; dlt_choices[i].name != NULL; i++) {
if (dlt_choices[i].dlt == dlt)
return (dlt_choices[i].description);
}
return (NULL);
}
#endif /* defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) */
#endif /* !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION) */
/*
* Get the data-link types available for a libpcap device.
*/
static data_link_info_t *
create_data_link_info(int dlt)
{
data_link_info_t *data_link_info;
const char *text;
data_link_info = (data_link_info_t *)g_malloc(sizeof (data_link_info_t));
data_link_info->dlt = dlt;
text = pcap_datalink_val_to_name(dlt);
if (text != NULL)
data_link_info->name = g_strdup(text);
else
data_link_info->name = g_strdup_printf("DLT %d", dlt);
text = pcap_datalink_val_to_description(dlt);
if (text != NULL)
data_link_info->description = g_strdup(text);
else
data_link_info->description = NULL;
return data_link_info;
}
GList *
get_pcap_linktype_list(const char *devname, char **err_str)
{
GList *linktype_list = NULL;
pcap_t *pch;
int deflt;
char errbuf[PCAP_ERRBUF_SIZE];
#ifdef HAVE_PCAP_LIST_DATALINKS
int *linktypes;
int i, nlt;
#endif
data_link_info_t *data_link_info;
#ifdef HAVE_PCAP_OPEN
pch = pcap_open(devname, MIN_PACKET_SIZE, 0, 0, NULL, errbuf);
#else
pch = pcap_open_live(devname, MIN_PACKET_SIZE, 0, 0, errbuf);
#endif
if (pch == NULL) {
if (err_str != NULL)
*err_str = g_strdup(errbuf);
return NULL;
}
deflt = get_pcap_linktype(pch, devname);
#ifdef HAVE_PCAP_LIST_DATALINKS
nlt = pcap_list_datalinks(pch, &linktypes);
if (nlt == 0 || linktypes == NULL) {
pcap_close(pch);
if (err_str != NULL)
*err_str = NULL; /* an empty list doesn't mean an error */
return NULL;
}
for (i = 0; i < nlt; i++) {
data_link_info = create_data_link_info(linktypes[i]);
/*
* XXX - for 802.11, make the most detailed 802.11
* version the default, rather than the one the
* device has as the default?
*/
if (linktypes[i] == deflt)
linktype_list = g_list_prepend(linktype_list,
data_link_info);
else
linktype_list = g_list_append(linktype_list,
data_link_info);
}
#ifdef HAVE_PCAP_FREE_DATALINKS
pcap_free_datalinks(linktypes);
#else
/*
* In Windows, there's no guarantee that if you have a library
* built with one version of the MSVC++ run-time library, and
* it returns a pointer to allocated data, you can free that
* data from a program linked with another version of the
* MSVC++ run-time library.
*
* This is not an issue on UN*X.
*
* See the mail threads starting at
*
* http://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
*
* and
*
* http://www.winpcap.org/pipermail/winpcap-users/2008-May/002498.html
*/
#ifndef _WIN32
#define xx_free free /* hack so checkAPIs doesn't complain */
xx_free(linktypes);
#endif /* _WIN32 */
#endif /* HAVE_PCAP_FREE_DATALINKS */
#else /* HAVE_PCAP_LIST_DATALINKS */
data_link_info = create_data_link_info(deflt);
linktype_list = g_list_append(linktype_list, data_link_info);
#endif /* HAVE_PCAP_LIST_DATALINKS */
pcap_close(pch);
return linktype_list;
}
static void
free_linktype_cb(gpointer data, gpointer user_data _U_)
{
data_link_info_t *linktype_info = (data_link_info_t *)data;
g_free(linktype_info->name);
g_free(linktype_info->description);
}
void
free_pcap_linktype_list(GList *linktype_list)
{
g_list_foreach(linktype_list, free_linktype_cb, NULL);
g_list_free(linktype_list);
}
const char *
linktype_val_to_name(int dlt)
{
return pcap_datalink_val_to_name(dlt);
}
int linktype_name_to_val(const char *linktype)
{
return pcap_datalink_name_to_val(linktype);
}
#endif /* HAVE_LIBPCAP */
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