bf81b42e1e
(COPYING will be updated in next commit) svn path=/trunk/; revision=43536
466 lines
15 KiB
C
466 lines
15 KiB
C
/* capture_ifinfo.c
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* Routines for getting interface information from dumpcap
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifdef HAVE_LIBPCAP
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#include <stdlib.h>
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#include <string.h>
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h> /* needed to define AF_ values on UNIX */
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#endif
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#ifdef HAVE_WINSOCK2_H
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#include <winsock2.h> /* needed to define AF_ values on Windows */
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#endif
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#ifdef NEED_INET_V6DEFS_H
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# include "wsutil/inet_v6defs.h"
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#endif
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#include <glib.h>
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#include "capture_opts.h"
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#include "capture_sync.h"
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#include "log.h"
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#include "wsutil/file_util.h"
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#include "capture_ifinfo.h"
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#ifdef HAVE_PCAP_REMOTE
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static GList *remote_interface_list = NULL;
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static void append_remote_list(GList *iflist)
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{
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GSList *list;
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GList *rlist;
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if_addr_t *if_addr, *temp_addr;
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if_info_t *if_info, *temp;
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for (rlist = g_list_nth(remote_interface_list, 0); rlist != NULL; rlist = g_list_next(rlist)) {
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if_info = (if_info_t *)rlist->data;
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temp = g_malloc0(sizeof(if_info_t));
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temp->name = g_strdup(if_info->name);
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temp->description = g_strdup(if_info->description);
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for (list = g_slist_nth(if_info->addrs, 0); list != NULL; list = g_slist_next(list)) {
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temp_addr = g_malloc0(sizeof(if_addr_t));
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if_addr = (if_addr_t *)list->data;
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if (if_addr) {
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temp_addr->ifat_type = if_addr->ifat_type;
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if (temp_addr->ifat_type == IF_AT_IPv4) {
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temp_addr->addr.ip4_addr = if_addr->addr.ip4_addr;
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} else {
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memcpy(temp_addr->addr.ip6_addr, if_addr->addr.ip6_addr, sizeof(if_addr->addr));
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}
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} else {
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g_free(temp_addr);
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temp_addr = NULL;
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}
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if (temp_addr) {
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temp->addrs = g_slist_append(temp->addrs, temp_addr);
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}
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}
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temp->loopback = if_info->loopback;
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iflist = g_list_append(iflist, temp);
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}
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}
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#endif
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/**
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* Fetch the interface list from a child process (dumpcap).
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*
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* @return A GList containing if_info_t structs if successful, NULL (with err and possibly err_str set) otherwise.
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*
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*/
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/* XXX - We parse simple text output to get our interface list. Should
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* we use "real" data serialization instead, e.g. via XML? */
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GList *
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capture_interface_list(int *err, char **err_str)
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{
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int ret;
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GList *if_list = NULL;
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int i, j;
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gchar *data, *primary_msg, *secondary_msg;
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gchar **raw_list, **if_parts, **addr_parts;
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gchar *name;
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if_info_t *if_info;
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if_addr_t *if_addr;
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List ...");
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/* Try to get our interface list */
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ret = sync_interface_list_open(&data, &primary_msg, &secondary_msg);
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if (ret != 0) {
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface List failed!");
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if (err_str) {
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*err_str = primary_msg;
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} else {
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g_free(primary_msg);
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}
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g_free(secondary_msg);
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*err = CANT_GET_INTERFACE_LIST;
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return NULL;
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}
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/* Split our lines */
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#ifdef _WIN32
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raw_list = g_strsplit(data, "\r\n", 0);
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#else
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raw_list = g_strsplit(data, "\n", 0);
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#endif
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g_free(data);
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for (i = 0; raw_list[i] != NULL; i++) {
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if_parts = g_strsplit(raw_list[i], "\t", 4);
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if (if_parts[0] == NULL || if_parts[1] == NULL || if_parts[2] == NULL ||
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if_parts[3] == NULL) {
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g_strfreev(if_parts);
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continue;
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}
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/* Number followed by the name, e.g "1. eth0" */
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name = strchr(if_parts[0], ' ');
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if (name) {
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name++;
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} else {
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g_strfreev(if_parts);
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continue;
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}
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if_info = g_malloc0(sizeof(if_info_t));
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if_info->name = g_strdup(name);
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if (strlen(if_parts[1]) > 0)
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if_info->description = g_strdup(if_parts[1]);
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addr_parts = g_strsplit(if_parts[2], ",", 0);
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for (j = 0; addr_parts[j] != NULL; j++) {
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if_addr = g_malloc0(sizeof(if_addr_t));
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if (inet_pton(AF_INET, addr_parts[j], &if_addr->addr.ip4_addr)) {
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if_addr->ifat_type = IF_AT_IPv4;
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} else if (inet_pton(AF_INET6, addr_parts[j],
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&if_addr->addr.ip6_addr)) {
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if_addr->ifat_type = IF_AT_IPv6;
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} else {
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g_free(if_addr);
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if_addr = NULL;
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}
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if (if_addr) {
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if_info->addrs = g_slist_append(if_info->addrs, if_addr);
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}
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}
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if (strcmp(if_parts[3], "loopback") == 0)
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if_info->loopback = TRUE;
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g_strfreev(if_parts);
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g_strfreev(addr_parts);
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if_list = g_list_append(if_list, if_info);
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}
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g_strfreev(raw_list);
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/* Check to see if we built a list */
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if (if_list == NULL) {
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*err = NO_INTERFACES_FOUND;
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if (err_str)
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*err_str = g_strdup("No interfaces found");
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}
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#ifdef HAVE_PCAP_REMOTE
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if (remote_interface_list && g_list_length(remote_interface_list) > 0) {
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append_remote_list(if_list);
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}
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#endif
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return if_list;
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}
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/* XXX - We parse simple text output to get our interface list. Should
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* we use "real" data serialization instead, e.g. via XML? */
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if_capabilities_t *
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capture_get_if_capabilities(const gchar *ifname, gboolean monitor_mode,
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char **err_str)
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{
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if_capabilities_t *caps;
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GList *linktype_list = NULL;
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int err, i;
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gchar *data, *primary_msg, *secondary_msg;
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gchar **raw_list, **lt_parts;
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data_link_info_t *data_link_info;
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities ...");
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/* Try to get our interface list */
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err = sync_if_capabilities_open(ifname, monitor_mode, &data,
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&primary_msg, &secondary_msg);
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if (err != 0) {
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities failed!");
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if (err_str) {
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*err_str = primary_msg;
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} else {
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g_free(primary_msg);
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}
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g_free(secondary_msg);
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return NULL;
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}
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/* Split our lines */
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#ifdef _WIN32
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raw_list = g_strsplit(data, "\r\n", 0);
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#else
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raw_list = g_strsplit(data, "\n", 0);
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#endif
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g_free(data);
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/*
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* First line is 0 if monitor mode isn't supported, 1 if it is.
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*/
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if (raw_list[0] == NULL || *raw_list[0] == '\0') {
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities returned no information!");
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if (err_str) {
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*err_str = g_strdup("Dumpcap returned no interface capability information");
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}
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return NULL;
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}
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/*
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* Allocate the interface capabilities structure.
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*/
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caps = g_malloc(sizeof *caps);
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switch (*raw_list[0]) {
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case '0':
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caps->can_set_rfmon = FALSE;
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break;
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case '1':
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caps->can_set_rfmon = TRUE;
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break;
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default:
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g_log(LOG_DOMAIN_CAPTURE, G_LOG_LEVEL_MESSAGE, "Capture Interface Capabilities returned bad information!");
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if (err_str) {
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*err_str = g_strdup_printf("Dumpcap returned \"%s\" for monitor-mode capability",
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raw_list[0]);
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}
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g_free(caps);
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return NULL;
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}
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/*
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* The rest are link-layer types.
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*/
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for (i = 1; raw_list[i] != NULL; i++) {
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/* ...and what if the interface name has a tab in it, Mr. Clever Programmer? */
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lt_parts = g_strsplit(raw_list[i], "\t", 3);
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if (lt_parts[0] == NULL || lt_parts[1] == NULL || lt_parts[2] == NULL) {
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g_strfreev(lt_parts);
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continue;
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}
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data_link_info = g_malloc(sizeof (data_link_info_t));
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data_link_info->dlt = (int) strtol(lt_parts[0], NULL, 10);
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data_link_info->name = g_strdup(lt_parts[1]);
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if (strcmp(lt_parts[2], "(not supported)") != 0)
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data_link_info->description = g_strdup(lt_parts[2]);
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else
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data_link_info->description = NULL;
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linktype_list = g_list_append(linktype_list, data_link_info);
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}
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g_strfreev(raw_list);
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/* Check to see if we built a list */
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if (linktype_list == NULL) {
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/* No. */
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if (err_str)
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*err_str = g_strdup("Dumpcap returned no link-layer types");
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g_free(caps);
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return NULL;
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}
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caps->data_link_types = linktype_list;
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return caps;
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}
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#ifdef HAVE_PCAP_REMOTE
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void add_interface_to_remote_list(if_info_t *if_info)
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{
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GSList *list;
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if_addr_t *if_addr, *temp_addr;
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if_info_t *temp = g_malloc0(sizeof(if_info_t));
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temp->name = g_strdup(if_info->name);
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temp->description = g_strdup(if_info->description);
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for (list = g_slist_nth(if_info->addrs, 0); list != NULL; list = g_slist_next(list)) {
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temp_addr = g_malloc0(sizeof(if_addr_t));
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if_addr = (if_addr_t *)list->data;
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if (if_addr) {
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temp_addr->ifat_type = if_addr->ifat_type;
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if (temp_addr->ifat_type == IF_AT_IPv4) {
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temp_addr->addr.ip4_addr = if_addr->addr.ip4_addr;
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} else {
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memcpy(temp_addr->addr.ip6_addr, if_addr->addr.ip6_addr, sizeof(if_addr->addr));
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}
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} else {
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g_free(temp_addr);
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temp_addr = NULL;
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}
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if (temp_addr) {
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temp->addrs = g_slist_append(temp->addrs, temp_addr);
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}
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}
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temp->loopback = if_info->loopback;
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remote_interface_list = g_list_append(remote_interface_list, temp);
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}
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#endif
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guint
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get_interface_type(gchar *name, gchar *description)
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{
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#if defined(__linux__)
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ws_statb64 statb;
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char *wireless_path;
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#endif
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#if defined(_WIN32)
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/*
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* Much digging failed to reveal any obvious way to get something such
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* as the SNMP MIB-II ifType value for an interface:
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*
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* http://www.iana.org/assignments/ianaiftype-mib
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*
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* by making some NDIS request.
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*/
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if (description && (strstr(description,"generic dialup") != NULL ||
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strstr(description,"PPP/SLIP") != NULL )) {
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return IF_DIALUP;
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} else if (description && (strstr(description,"Wireless") != NULL ||
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strstr(description,"802.11") != NULL)) {
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return IF_WIRELESS;
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} else if (description && strstr(description,"AirPcap") != NULL ||
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strstr(name,"airpcap")) {
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return IF_AIRPCAP;
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} else if (description && strstr(description, "Bluetooth") != NULL ) {
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return IF_BLUETOOTH;
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}
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#elif defined(__APPLE__)
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/*
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* XXX - yes, fetching all the network addresses for an interface
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* gets you an AF_LINK address, of type "struct sockaddr_dl", and,
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* yes, that includes an SNMP MIB-II ifType value.
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*
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* However, it's IFT_ETHER, i.e. Ethernet, for AirPort interfaces,
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* not IFT_IEEE80211 (which isn't defined in OS X in any case).
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*
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* Perhaps some other BSD-flavored OSes won't make this mistake;
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* however, FreeBSD 7.0 and OpenBSD 4.2, at least, appear to have
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* made the same mistake, at least for my Belkin ZyDAS stick.
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*
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* XXX - this is wrong on a MacBook Air, as en0 is the AirPort
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* interface, and it's also wrong on a Mac that has no AirPort
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* interfaces and has multiple Ethernet interfaces.
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*
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* The SystemConfiguration framework is your friend here.
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* SCNetworkInterfaceGetInterfaceType() will get the interface
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* type. SCNetworkInterfaceCopyAll() gets all network-capable
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* interfaces on the system; SCNetworkInterfaceGetBSDName()
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* gets the "BSD name" of the interface, so we look for
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* an interface with the specified "BSD name" and get its
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* interface type. The interface type is a CFString, and:
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*
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* kSCNetworkInterfaceTypeIEEE80211 means IF_WIRELESS;
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* kSCNetworkInterfaceTypeBluetooth means IF_BLUETOOTH;
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* kSCNetworkInterfaceTypeModem or
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* kSCNetworkInterfaceTypePPP or
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* maybe kSCNetworkInterfaceTypeWWAN means IF_DIALUP
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*/
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if (strcmp(name, "en1") == 0) {
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return IF_WIRELESS;
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}
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/*
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* XXX - PPP devices have names beginning with "ppp" and an IFT_ of
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* IFT_PPP, but they could be dial-up, or PPPoE, or mobile phone modem,
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* or VPN, or... devices. One might have to dive into the bowels of
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* IOKit to find out.
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*/
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/*
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* XXX - there's currently no support for raw Bluetooth capture,
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* and IP-over-Bluetooth devices just look like fake Ethernet
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* devices. There's also Bluetooth modem support, but that'll
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* probably just give you a device that looks like a PPP device.
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*/
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#elif defined(__linux__)
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/*
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* Look for /sys/class/net/{device}/wireless.
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*/
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wireless_path = g_strdup_printf("/sys/class/net/%s/wireless", name);
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if (wireless_path != NULL) {
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if (ws_stat64(wireless_path, &statb) == 0) {
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g_free(wireless_path);
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return IF_WIRELESS;
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}
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}
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/*
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* Bluetooth devices.
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*
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* XXX - this is for raw Bluetooth capture; what about IP-over-Bluetooth
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* devices?
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*/
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if ( strstr(name,"bluetooth") != NULL) {
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return IF_BLUETOOTH;
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}
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/*
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* USB devices.
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*/
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if ( strstr(name,"usbmon") != NULL ) {
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return IF_USB;
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}
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#endif
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/*
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* Bridge, NAT, or host-only interfaces on VMWare hosts have the name
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* vmnet[0-9]+ or VMnet[0-9+ on Windows. Guests might use a native
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* (LANCE or E1000) driver or the vmxnet driver. These devices have an
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* IFT_ of IFT_ETHER, so we have to check the name.
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*/
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if ( g_ascii_strncasecmp(name, "vmnet", 5) == 0) {
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return IF_VIRTUAL;
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}
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if ( g_ascii_strncasecmp(name, "vmxnet", 6) == 0) {
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return IF_VIRTUAL;
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}
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if (description && strstr(description, "VMware") != NULL ) {
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return IF_VIRTUAL;
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}
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return IF_WIRED;
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}
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#endif /* HAVE_LIBPCAP */
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