forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Some of those routines are used only in dumpcap; others are used in TShark and Wireshark as well. Change-Id: I9d92483f2fcff57a7d8b6bf6bdf2870505d19fb7 Reviewed-on: https://code.wireshark.org/review/2841 Reviewed-by: Guy Harris <guy@alum.mit.edu>
640 lines
17 KiB
C
640 lines
17 KiB
C
/* capture-pcap-util.c
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* Utility routines for packet capture
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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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#include "config.h"
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#ifdef HAVE_LIBPCAP
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#include <glib.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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#include <string.h>
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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <wtap.h>
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#include <libpcap.h>
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#include "caputils/capture_ifinfo.h"
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#include "caputils/capture-pcap-util.h"
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#include "caputils/capture-pcap-util-int.h"
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#include "wsutil/file_util.h"
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#ifndef _WIN32
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#include <netinet/in.h>
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#endif
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#ifdef _WIN32
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#include "caputils/capture_win_ifnames.h" /* windows friendly interface names */
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#endif
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/*
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* Given an interface name, find the "friendly name" and interface
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* type for the interface.
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*/
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#if defined(__APPLE__)
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#include <CoreFoundation/CoreFoundation.h>
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#include <SystemConfiguration/SystemConfiguration.h>
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#include <wsutil/cfutils.h>
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/*
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* On OS X, we get the "friendly name" and interface type for the interface
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* from the System Configuration framework.
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*
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* To find the System Configuration framework information for the
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* interface, we get all the interfaces that the System Configuration
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* framework knows about and look for the one with a "BSD name" matching
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* the interface name.
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*
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* If we find it, we use its "localized display name", if it has one, as
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* the "friendly name".
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*
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* As for the interface type:
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*
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* Yes, fetching all the network addresses for an interface gets you an
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* AF_LINK address, of type "struct sockaddr_dl", and, yes, that includes
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* 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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* SCNetworkInterfaceGetInterfaceType() will get the interface
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* 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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static void
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add_unix_interface_ifinfo(if_info_t *if_info, const char *name,
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const char *description _U_)
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{
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CFStringRef name_CFString;
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CFArrayRef interfaces;
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CFIndex num_interfaces;
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CFIndex i;
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SCNetworkInterfaceRef interface;
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CFStringRef bsdname_CFString;
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CFStringRef friendly_name_CFString;
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CFStringRef interface_type_CFString;
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interfaces = SCNetworkInterfaceCopyAll();
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if (interfaces == NULL) {
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/*
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* Couldn't get a list of interfaces.
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*/
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return;
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}
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name_CFString = CFStringCreateWithCString(kCFAllocatorDefault,
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name, kCFStringEncodingUTF8);
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if (name_CFString == NULL) {
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/*
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* Couldn't convert the interface name to a CFString.
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*/
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CFRelease(interfaces);
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return;
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}
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num_interfaces = CFArrayGetCount(interfaces);
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for (i = 0; i < num_interfaces; i++) {
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interface = (SCNetworkInterfaceRef)CFArrayGetValueAtIndex(interfaces, i);
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bsdname_CFString = SCNetworkInterfaceGetBSDName(interface);
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if (bsdname_CFString == NULL) {
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/*
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* This interface has no BSD name, so it's not
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* a regular network interface.
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*/
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continue;
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}
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if (CFStringCompare(name_CFString, bsdname_CFString, 0) == 0) {
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/*
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* This is the interface.
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* First, get the friendly name.
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*/
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friendly_name_CFString = SCNetworkInterfaceGetLocalizedDisplayName(interface);
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if (friendly_name_CFString != NULL)
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if_info->friendly_name = CFString_to_C_string(friendly_name_CFString);
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/*
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* Now get the interface type.
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*/
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interface_type_CFString = SCNetworkInterfaceGetInterfaceType(interface);
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if (CFStringCompare(interface_type_CFString,
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kSCNetworkInterfaceTypeIEEE80211, 0) == kCFCompareEqualTo)
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if_info->type = IF_WIRELESS;
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else if (CFStringCompare(interface_type_CFString,
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kSCNetworkInterfaceTypeBluetooth, 0) == kCFCompareEqualTo)
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if_info->type = IF_BLUETOOTH;
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else if (CFStringCompare(interface_type_CFString,
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kSCNetworkInterfaceTypeModem, 0) == kCFCompareEqualTo)
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if_info->type = IF_DIALUP;
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else if (CFStringCompare(interface_type_CFString,
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kSCNetworkInterfaceTypePPP, 0) == kCFCompareEqualTo)
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if_info->type = IF_DIALUP;
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else if (CFStringCompare(interface_type_CFString,
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kSCNetworkInterfaceTypeWWAN, 0) == kCFCompareEqualTo)
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if_info->type = IF_DIALUP;
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else
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if_info->type = IF_WIRED;
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break;
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}
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}
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CFRelease(interfaces);
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CFRelease(name_CFString);
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}
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#elif defined(__linux__)
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/*
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* Linux doesn't offer any form of "friendly name", but you can
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* determine an interface type to some degree.
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*/
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static void
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add_unix_interface_ifinfo(if_info_t *if_info, const char *name,
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const char *description _U_)
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{
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char *wireless_path;
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ws_statb64 statb;
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/*
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* Look for /sys/class/net/{device}/wireless. If it exists,
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* it's a wireless interface.
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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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if_info->type = IF_WIRELESS;
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g_free(wireless_path);
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}
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if (if_info->type == IF_WIRED) {
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/*
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* We still don't know what it is. Check for
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* Bluetooth and USB devices.
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*/
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if (strstr(name, "bluetooth") != NULL) {
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/*
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* XXX - this is for raw Bluetooth capture; what
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* about IP-over-Bluetooth devices?
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*/
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if_info->type = IF_BLUETOOTH;
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} else if (strstr(name, "usbmon") != NULL)
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if_info->type = IF_USB;
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}
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}
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#else
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/*
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* On other UN*Xes, if there is a description, it's a friendly
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* name, and there is no vendor description. ("Other UN*Xes"
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* currently means "FreeBSD and OpenBSD".)
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*/
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void
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add_unix_interface_ifinfo(if_info_t *if_info, const char *name _U_,
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const char *description)
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{
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if_info->friendly_name = g_strdup(description);
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}
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#endif
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if_info_t *
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if_info_new(const char *name, const char *description, gboolean loopback)
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{
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if_info_t *if_info;
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#ifdef _WIN32
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const char *guid_text;
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GUID guid;
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#endif
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if_info = (if_info_t *)g_malloc(sizeof (if_info_t));
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if_info->name = g_strdup(name);
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if_info->friendly_name = NULL; /* default - unknown */
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if_info->vendor_description = NULL;
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if_info->type = IF_WIRED; /* default */
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#ifdef _WIN32
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/*
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* Get the interface type.
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*
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* Much digging failed to reveal any obvious way to get something
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* such 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. And even if there were such
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* a way, there's no guarantee that the ifType reflects an
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* interface type that a user would view as correct (for
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* example, some systems report Wi-Fi interfaces as
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* Ethernet interfaces).
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*
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* So we look for keywords in the vendor's interface
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* description.
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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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if_info->type = 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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if_info->type = IF_WIRELESS;
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} else if (description && strstr(description, "AirPcap") != NULL ||
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strstr(name, "airpcap") != NULL) {
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if_info->type = IF_AIRPCAP;
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} else if (description && strstr(description, "Bluetooth") != NULL ) {
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if_info->type = IF_BLUETOOTH;
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} else if (description && strstr(description, "VMware") != NULL) {
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/*
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* Bridge, NAT, or host-only interface on a VMware host.
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*
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* XXX - what about guest interfaces?
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*/
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if_info->type = IF_VIRTUAL;
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}
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/*
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* On Windows, the "description" is a vendor description,
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* and the friendly name isn't returned by WinPcap.
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* Fetch it ourselves.
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*/
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/*
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* Skip over the "\Device\NPF_" prefix in the device name,
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* if present.
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*/
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if (strncmp("\\Device\\NPF_", name, 12) == 0)
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guid_text = name + 12;
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else
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guid_text = name;
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/* Now try to parse what remains as a GUID. */
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if (parse_as_guid(guid_text, &guid)) {
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/*
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* Success. Try to get a friendly name using the GUID.
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* As this is a regular interface, the description is a
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* vendor description.
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*/
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if_info->friendly_name = get_interface_friendly_name_from_device_guid(&guid);
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if_info->vendor_description = g_strdup(description);
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} else {
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/*
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* This is probably not a regular interface; we only
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* support NT 5 (W2K) and later, so all regular interfaces
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* should have GUIDs at the end of the name. Therefore,
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* the description, if supplied, is a friendly name
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* provided by WinPcap, and there is no vendor
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* description.
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*/
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if_info->friendly_name = g_strdup(description);
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if_info->vendor_description = NULL;
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}
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#else
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/*
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* On UN*X, if there is a description, it's a friendly
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* name, and there is no vendor description.
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*
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* Try the platform's way of getting a friendly name and
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* interface type first.
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*
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* If that fails, then, for a loopback interface, give it the
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* friendly name "Loopback" and, for VMware interfaces,
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* give them the type IF_VIRTUAL.
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*/
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add_unix_interface_ifinfo(if_info, name, description);
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if (if_info->type == IF_WIRED) {
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/*
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* This is the default interface type.
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*
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* Bridge, NAT, or host-only interfaces on VMWare hosts
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* have the name vmnet[0-9]+. Guests might use a native
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* (LANCE or E1000) driver or the vmxnet driver. Check
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* the name.
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*/
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if (g_ascii_strncasecmp(name, "vmnet", 5) == 0)
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if_info->type = IF_VIRTUAL;
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else if (g_ascii_strncasecmp(name, "vmxnet", 6) == 0)
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if_info->type = IF_VIRTUAL;
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}
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if (if_info->friendly_name == NULL) {
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/*
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* We couldn't get interface information using platform-
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* dependent calls.
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*
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* If this is a loopback interface, give it a
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* "friendly name" of "Loopback".
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*/
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if (loopback)
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if_info->friendly_name = g_strdup("Loopback");
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}
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if_info->vendor_description = NULL;
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#endif
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if_info->loopback = loopback;
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if_info->addrs = NULL;
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return if_info;
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}
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void
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if_info_add_address(if_info_t *if_info, struct sockaddr *addr)
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{
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if_addr_t *if_addr;
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struct sockaddr_in *ai;
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#ifdef INET6
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struct sockaddr_in6 *ai6;
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#endif
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switch (addr->sa_family) {
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case AF_INET:
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ai = (struct sockaddr_in *)(void *)addr;
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if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
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if_addr->ifat_type = IF_AT_IPv4;
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if_addr->addr.ip4_addr =
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*((guint32 *)&(ai->sin_addr.s_addr));
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if_info->addrs = g_slist_append(if_info->addrs, if_addr);
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break;
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#ifdef INET6
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case AF_INET6:
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ai6 = (struct sockaddr_in6 *)(void *)addr;
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if_addr = (if_addr_t *)g_malloc(sizeof(*if_addr));
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if_addr->ifat_type = IF_AT_IPv6;
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memcpy((void *)&if_addr->addr.ip6_addr,
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(void *)&ai6->sin6_addr.s6_addr,
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sizeof if_addr->addr.ip6_addr);
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if_info->addrs = g_slist_append(if_info->addrs, if_addr);
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break;
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#endif
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}
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}
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#ifdef HAVE_PCAP_FINDALLDEVS
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/*
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* Get all IP address information for the given interface.
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*/
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static void
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if_info_ip(if_info_t *if_info, pcap_if_t *d)
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{
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pcap_addr_t *a;
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/* All addresses */
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for (a = d->addresses; a != NULL; a = a->next) {
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if (a->addr != NULL)
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if_info_add_address(if_info, a->addr);
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}
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}
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#ifdef HAVE_PCAP_REMOTE
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GList *
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get_interface_list_findalldevs_ex(const char *source,
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struct pcap_rmtauth *auth,
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int *err, char **err_str)
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{
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GList *il = NULL;
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pcap_if_t *alldevs, *dev;
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if_info_t *if_info;
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char errbuf[PCAP_ERRBUF_SIZE];
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if (pcap_findalldevs_ex((char *)source, auth, &alldevs, errbuf) == -1) {
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*err = CANT_GET_INTERFACE_LIST;
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if (err_str != NULL)
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*err_str = cant_get_if_list_error_message(errbuf);
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return NULL;
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}
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if (alldevs == NULL) {
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/*
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* No interfaces found.
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*/
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*err = NO_INTERFACES_FOUND;
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if (err_str != NULL)
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*err_str = NULL;
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return NULL;
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}
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for (dev = alldevs; dev != NULL; dev = dev->next) {
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if_info = if_info_new(dev->name, dev->description,
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(dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
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il = g_list_append(il, if_info);
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if_info_ip(if_info, dev);
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}
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pcap_freealldevs(alldevs);
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return il;
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}
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#endif
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GList *
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get_interface_list_findalldevs(int *err, char **err_str)
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{
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GList *il = NULL;
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pcap_if_t *alldevs, *dev;
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if_info_t *if_info;
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char errbuf[PCAP_ERRBUF_SIZE];
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if (pcap_findalldevs(&alldevs, errbuf) == -1) {
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*err = CANT_GET_INTERFACE_LIST;
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if (err_str != NULL)
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*err_str = cant_get_if_list_error_message(errbuf);
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return NULL;
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}
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if (alldevs == NULL) {
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/*
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* No interfaces found.
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*/
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*err = NO_INTERFACES_FOUND;
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if (err_str != NULL)
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*err_str = NULL;
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return NULL;
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}
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for (dev = alldevs; dev != NULL; dev = dev->next) {
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if_info = if_info_new(dev->name, dev->description,
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(dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
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il = g_list_append(il, if_info);
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if_info_ip(if_info, dev);
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}
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pcap_freealldevs(alldevs);
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return il;
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}
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#endif /* HAVE_PCAP_FINDALLDEVS */
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static void
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free_if_info_addr_cb(gpointer addr, gpointer user_data _U_)
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{
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g_free(addr);
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}
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static void
|
|
free_if_cb(gpointer data, gpointer user_data _U_)
|
|
{
|
|
if_info_t *if_info = (if_info_t *)data;
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|
|
|
g_free(if_info->name);
|
|
g_free(if_info->friendly_name);
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|
g_free(if_info->vendor_description);
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|
|
|
g_slist_foreach(if_info->addrs, free_if_info_addr_cb, NULL);
|
|
g_slist_free(if_info->addrs);
|
|
g_free(if_info);
|
|
}
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|
|
|
void
|
|
free_interface_list(GList *if_list)
|
|
{
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|
g_list_foreach(if_list, free_if_cb, NULL);
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|
g_list_free(if_list);
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|
}
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#if !defined(HAVE_PCAP_DATALINK_NAME_TO_VAL) || !defined(HAVE_PCAP_DATALINK_VAL_TO_NAME) || !defined(HAVE_PCAP_DATALINK_VAL_TO_DESCRIPTION)
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|
struct dlt_choice {
|
|
const char *name;
|
|
const char *description;
|
|
int dlt;
|
|
};
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|
|
|
#define DLT_CHOICE(code, description) { #code, description, code }
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|
#define DLT_CHOICE_SENTINEL { NULL, NULL, 0 }
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|
|
|
static struct dlt_choice dlt_choices[] = {
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|
DLT_CHOICE(DLT_NULL, "BSD loopback"),
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|
DLT_CHOICE(DLT_EN10MB, "Ethernet"),
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|
DLT_CHOICE(DLT_IEEE802, "Token ring"),
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|
DLT_CHOICE(DLT_ARCNET, "ARCNET"),
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|
DLT_CHOICE(DLT_SLIP, "SLIP"),
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|
DLT_CHOICE(DLT_PPP, "PPP"),
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|
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) */
|
|
|
|
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_if_capabilities(if_capabilities_t *caps)
|
|
{
|
|
g_list_foreach(caps->data_link_types, free_linktype_cb, NULL);
|
|
g_list_free(caps->data_link_types);
|
|
g_free(caps);
|
|
}
|
|
|
|
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 */
|