forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
Return an error string if that happens. If it doesn't fail, it will return a value >= 1; it will never return 0, so don't check for that. Change-Id: I6d7ee2683c1ceae73e9d9d61c0a6e6d30b2c4400 Reviewed-on: https://code.wireshark.org/review/13100 Reviewed-by: Guy Harris <guy@alum.mit.edu>
1375 lines
39 KiB
C
1375 lines
39 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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/*
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* Linux bonding devices mishandle unknown ioctls; they fail
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* with ENODEV rather than ENOTSUP, EOPNOTSUPP, or ENOTTY,
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* so pcap_can_set_rfmon() returns a "no such device" indication
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* if we try to do SIOCGIWMODE on them.
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*
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* So, on Linux, we check for bonding devices, if we can, before
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* trying pcap_can_set_rfmon(), as pcap_can_set_rfmon() will
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* end up trying SIOCGIWMODE on the device if that ioctl exists.
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*/
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#if defined(HAVE_PCAP_CREATE) && defined(__linux__)
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#include <sys/ioctl.h>
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/*
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* If we're building for a Linux version that supports bonding,
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* HAVE_BONDING will be defined.
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*/
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#ifdef HAVE_LINUX_SOCKIOS_H
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#include <linux/sockios.h>
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#endif
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#ifdef HAVE_LINUX_IF_BONDING_H
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#include <linux/if_bonding.h>
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#endif
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#if defined(BOND_INFO_QUERY_OLD) || defined(SIOCBONDINFOQUERY)
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#define HAVE_BONDING
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#endif
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#endif /* defined(HAVE_PCAP_CREATE) && defined(__linux__) */
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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 "log.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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* Standard secondary message for unexpected errors.
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*/
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static const char please_report[] =
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"Please report this to the Wireshark developers.\n"
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"https://bugs.wireshark.org/\n"
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"(This is not a crash; please do not report it as such.)";
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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 HAVE_EXTCAP
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if_info->extcap = g_strdup("");
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#endif
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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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struct sockaddr_in6 *ai6;
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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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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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}
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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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/*
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* WinPcap can overflow PCAP_ERRBUF_SIZE if the host is unreachable.
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* Fudge a larger size.
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*/
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char errbuf[PCAP_ERRBUF_SIZE*4];
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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 = 0;
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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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|
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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);
|
|
|
|
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 = 0;
|
|
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,
|
|
(dev->flags & PCAP_IF_LOOPBACK) ? TRUE : FALSE);
|
|
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->friendly_name);
|
|
g_free(if_info->vendor_description);
|
|
#ifdef HAVE_EXTCAP
|
|
g_free(if_info->extcap);
|
|
#endif
|
|
|
|
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) */
|
|
|
|
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);
|
|
g_free(linktype_info);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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_datalink(pcap_t *pch, const char *devicename
|
|
#ifndef _AIX
|
|
_U_)
|
|
#else
|
|
)
|
|
#endif
|
|
{
|
|
int datalink;
|
|
#ifdef _AIX
|
|
const char *ifacename;
|
|
#endif
|
|
|
|
datalink = 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 "datalink" 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(devicename, '/');
|
|
if (ifacename == NULL)
|
|
ifacename = devicename;
|
|
|
|
/* See if it matches any of the LAN device names. */
|
|
if (strncmp(ifacename, "en", 2) == 0) {
|
|
if (datalink == 6) {
|
|
/*
|
|
* That's the RFC 1573 value for Ethernet;
|
|
* map it to DLT_EN10MB.
|
|
*/
|
|
datalink = 1;
|
|
}
|
|
} else if (strncmp(ifacename, "et", 2) == 0) {
|
|
if (datalink == 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.)
|
|
*/
|
|
datalink = 1;
|
|
}
|
|
} else if (strncmp(ifacename, "tr", 2) == 0) {
|
|
if (datalink == 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.
|
|
*/
|
|
datalink = 6;
|
|
}
|
|
} else if (strncmp(ifacename, "fi", 2) == 0) {
|
|
if (datalink == 15) {
|
|
/*
|
|
* That's the RFC 1573 value for FDDI;
|
|
* map it to DLT_FDDI.
|
|
*/
|
|
datalink = 10;
|
|
}
|
|
} else if (strncmp(ifacename, "lo", 2) == 0) {
|
|
if (datalink == 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.
|
|
*/
|
|
datalink = 0;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
return datalink;
|
|
}
|
|
|
|
/* Set the data link type on a pcap. */
|
|
gboolean
|
|
set_pcap_datalink(pcap_t *pcap_h, int datalink, char *name,
|
|
char *errmsg, size_t errmsg_len,
|
|
char *secondary_errmsg, size_t secondary_errmsg_len)
|
|
{
|
|
char *set_datalink_err_str;
|
|
|
|
if (datalink == -1)
|
|
return TRUE; /* just use the default */
|
|
#ifdef HAVE_PCAP_SET_DATALINK
|
|
if (pcap_set_datalink(pcap_h, datalink) == 0)
|
|
return TRUE; /* no error */
|
|
set_datalink_err_str = pcap_geterr(pcap_h);
|
|
#else
|
|
/* Let them set it to the type it is; reject any other request. */
|
|
if (get_pcap_datalink(pcap_h, name) == datalink)
|
|
return TRUE; /* no error */
|
|
set_datalink_err_str =
|
|
"That DLT isn't one of the DLTs supported by this device";
|
|
#endif
|
|
g_snprintf(errmsg, (gulong) errmsg_len, "Unable to set data link type on interface '%s' (%s).",
|
|
name, set_datalink_err_str);
|
|
/*
|
|
* If the error isn't "XXX is not one of the DLTs supported by this device",
|
|
* tell the user to tell the Wireshark developers about it.
|
|
*/
|
|
if (strstr(set_datalink_err_str, "is not one of the DLTs supported by this device") == NULL)
|
|
g_snprintf(secondary_errmsg, (gulong) secondary_errmsg_len, please_report);
|
|
else
|
|
secondary_errmsg[0] = '\0';
|
|
return FALSE;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static GList *
|
|
get_data_link_types(pcap_t *pch, interface_options *interface_opts,
|
|
char **err_str)
|
|
{
|
|
GList *data_link_types;
|
|
int deflt;
|
|
#ifdef HAVE_PCAP_LIST_DATALINKS
|
|
int *linktypes;
|
|
int i, nlt;
|
|
#endif
|
|
data_link_info_t *data_link_info;
|
|
|
|
deflt = get_pcap_datalink(pch, interface_opts->name);
|
|
#ifdef HAVE_PCAP_LIST_DATALINKS
|
|
nlt = pcap_list_datalinks(pch, &linktypes);
|
|
if (nlt < 0) {
|
|
/*
|
|
* This either returns a negative number for an error
|
|
* or returns a number > 0 and sets linktypes.
|
|
*/
|
|
pcap_close(pch);
|
|
if (err_str != NULL) {
|
|
if (nlt == PCAP_ERROR)
|
|
*err_str = g_strdup_printf("pcap_list_datalinks() failed: %s",
|
|
pcap_geterr(pch));
|
|
else
|
|
*err_str = g_strdup(pcap_statustostr(nlt));
|
|
}
|
|
return NULL;
|
|
}
|
|
data_link_types = 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)
|
|
data_link_types = g_list_prepend(data_link_types,
|
|
data_link_info);
|
|
else
|
|
data_link_types = g_list_append(data_link_types,
|
|
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
|
|
*
|
|
* https://www.winpcap.org/pipermail/winpcap-users/2006-September/001421.html
|
|
*
|
|
* and
|
|
*
|
|
* https://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);
|
|
data_link_types = g_list_append(data_link_types, data_link_info);
|
|
#endif /* HAVE_PCAP_LIST_DATALINKS */
|
|
|
|
if (err_str != NULL)
|
|
*err_str = NULL;
|
|
return data_link_types;
|
|
}
|
|
|
|
#ifdef HAVE_PCAP_CREATE
|
|
#ifdef HAVE_BONDING
|
|
static gboolean
|
|
is_linux_bonding_device(const char *ifname)
|
|
{
|
|
int fd;
|
|
struct ifreq ifr;
|
|
ifbond ifb;
|
|
|
|
fd = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (fd == -1)
|
|
return FALSE;
|
|
|
|
memset(&ifr, 0, sizeof ifr);
|
|
g_strlcpy(ifr.ifr_name, ifname, sizeof ifr.ifr_name);
|
|
memset(&ifb, 0, sizeof ifb);
|
|
ifr.ifr_data = (caddr_t)&ifb;
|
|
#if defined(SIOCBONDINFOQUERY)
|
|
if (ioctl(fd, SIOCBONDINFOQUERY, &ifr) == 0) {
|
|
close(fd);
|
|
return TRUE;
|
|
}
|
|
#else
|
|
if (ioctl(fd, BOND_INFO_QUERY_OLD, &ifr) == 0) {
|
|
close(fd);
|
|
return TRUE;
|
|
}
|
|
#endif
|
|
|
|
close(fd);
|
|
return FALSE;
|
|
}
|
|
#else
|
|
static gboolean
|
|
is_linux_bonding_device(const char *ifname _U_)
|
|
{
|
|
return FALSE;
|
|
}
|
|
#endif
|
|
|
|
if_capabilities_t *
|
|
get_if_capabilities_pcap_create(interface_options *interface_opts,
|
|
char **err_str)
|
|
{
|
|
if_capabilities_t *caps;
|
|
char errbuf[PCAP_ERRBUF_SIZE];
|
|
pcap_t *pch;
|
|
int status;
|
|
|
|
/*
|
|
* Allocate the interface capabilities structure.
|
|
*/
|
|
caps = (if_capabilities_t *)g_malloc(sizeof *caps);
|
|
|
|
pch = pcap_create(interface_opts->name, errbuf);
|
|
if (pch == NULL) {
|
|
if (err_str != NULL)
|
|
*err_str = g_strdup(errbuf);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
if (is_linux_bonding_device(interface_opts->name)) {
|
|
/*
|
|
* Linux bonding device; not Wi-Fi, so no monitor mode, and
|
|
* calling pcap_can_set_rfmon() might get a "no such device"
|
|
* error.
|
|
*/
|
|
status = 0;
|
|
} else {
|
|
/*
|
|
* Not a Linux bonding device, so go ahead.
|
|
*/
|
|
status = pcap_can_set_rfmon(pch);
|
|
}
|
|
if (status < 0) {
|
|
/* Error. */
|
|
if (status == PCAP_ERROR)
|
|
*err_str = g_strdup_printf("pcap_can_set_rfmon() failed: %s",
|
|
pcap_geterr(pch));
|
|
else
|
|
*err_str = g_strdup(pcap_statustostr(status));
|
|
pcap_close(pch);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
if (status == 0)
|
|
caps->can_set_rfmon = FALSE;
|
|
else if (status == 1) {
|
|
caps->can_set_rfmon = TRUE;
|
|
if (interface_opts->monitor_mode)
|
|
pcap_set_rfmon(pch, 1);
|
|
} else {
|
|
if (err_str != NULL) {
|
|
*err_str = g_strdup_printf("pcap_can_set_rfmon() returned %d",
|
|
status);
|
|
}
|
|
pcap_close(pch);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
|
|
status = pcap_activate(pch);
|
|
if (status < 0) {
|
|
/* Error. We ignore warnings (status > 0). */
|
|
if (err_str != NULL) {
|
|
if (status == PCAP_ERROR)
|
|
*err_str = g_strdup_printf("pcap_activate() failed: %s",
|
|
pcap_geterr(pch));
|
|
else
|
|
*err_str = g_strdup(pcap_statustostr(status));
|
|
}
|
|
pcap_close(pch);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
|
|
caps->data_link_types = get_data_link_types(pch, interface_opts,
|
|
err_str);
|
|
if (caps->data_link_types == NULL) {
|
|
pcap_close(pch);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
|
|
pcap_close(pch);
|
|
|
|
if (err_str != NULL)
|
|
*err_str = NULL;
|
|
return caps;
|
|
}
|
|
|
|
pcap_t *
|
|
open_capture_device_pcap_create(capture_options *capture_opts
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
,
|
|
#else
|
|
_U_,
|
|
#endif
|
|
interface_options *interface_opts, int timeout,
|
|
char (*open_err_str)[PCAP_ERRBUF_SIZE])
|
|
{
|
|
pcap_t *pcap_h;
|
|
int err;
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Calling pcap_create() using %s.", interface_opts->name);
|
|
pcap_h = pcap_create(interface_opts->name, *open_err_str);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"pcap_create() returned %p.", (void *)pcap_h);
|
|
if (pcap_h != NULL) {
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Calling pcap_set_snaplen() with snaplen %d.",
|
|
interface_opts->snaplen);
|
|
pcap_set_snaplen(pcap_h, interface_opts->snaplen);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Calling pcap_set_promisc() with promisc_mode %d.",
|
|
interface_opts->promisc_mode);
|
|
pcap_set_promisc(pcap_h, interface_opts->promisc_mode);
|
|
pcap_set_timeout(pcap_h, timeout);
|
|
|
|
#ifdef HAVE_PCAP_SET_TSTAMP_PRECISION
|
|
/*
|
|
* If we're writing pcap-ng files, try to enable
|
|
* nanosecond-resolution capture; any code that
|
|
* can read pcap-ng files must be able to handle
|
|
* nanosecond-resolution time stamps. We don't
|
|
* care whether it succeeds or fails - if it fails,
|
|
* we just use the microsecond-precision time stamps
|
|
* we get.
|
|
*
|
|
* If we're writing pcap files, don't try to enable
|
|
* nanosecond-resolution capture, as not all code
|
|
* that reads pcap files recognizes the nanosecond-
|
|
* resolution pcap file magic number.
|
|
* We don't care whether this succeeds or fails; if it
|
|
* fails (because we don't have pcap_set_tstamp_precision(),
|
|
* or because we do but the OS or device doesn't support
|
|
* nanosecond resolution timing), we just use microsecond-
|
|
* resolution time stamps.
|
|
*/
|
|
if (capture_opts->use_pcapng)
|
|
request_high_resolution_timestamp(pcap_h);
|
|
#endif /* HAVE_PCAP_SET_TSTAMP_PRECISION */
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"buffersize %d.", interface_opts->buffer_size);
|
|
if (interface_opts->buffer_size != 0)
|
|
pcap_set_buffer_size(pcap_h,
|
|
interface_opts->buffer_size * 1024 * 1024);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"monitor_mode %d.", interface_opts->monitor_mode);
|
|
if (interface_opts->monitor_mode)
|
|
pcap_set_rfmon(pcap_h, 1);
|
|
err = pcap_activate(pcap_h);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"pcap_activate() returned %d.", err);
|
|
if (err < 0) {
|
|
/* Failed to activate, set to NULL */
|
|
if (err == PCAP_ERROR)
|
|
g_strlcpy(*open_err_str, pcap_geterr(pcap_h),
|
|
sizeof *open_err_str);
|
|
else
|
|
g_strlcpy(*open_err_str, pcap_statustostr(err),
|
|
sizeof *open_err_str);
|
|
pcap_close(pcap_h);
|
|
pcap_h = NULL;
|
|
}
|
|
}
|
|
return pcap_h;
|
|
}
|
|
#endif /* HAVE_PCAP_CREATE */
|
|
|
|
if_capabilities_t *
|
|
get_if_capabilities_pcap_open_live(interface_options *interface_opts,
|
|
char **err_str)
|
|
{
|
|
if_capabilities_t *caps;
|
|
char errbuf[PCAP_ERRBUF_SIZE];
|
|
pcap_t *pch;
|
|
|
|
/*
|
|
* Allocate the interface capabilities structure.
|
|
*/
|
|
caps = (if_capabilities_t *)g_malloc(sizeof *caps);
|
|
|
|
pch = pcap_open_live(interface_opts->name, MIN_PACKET_SIZE, 0, 0,
|
|
errbuf);
|
|
caps->can_set_rfmon = FALSE;
|
|
if (pch == NULL) {
|
|
if (err_str != NULL)
|
|
*err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
caps->data_link_types = get_data_link_types(pch, interface_opts,
|
|
err_str);
|
|
if (caps->data_link_types == NULL) {
|
|
pcap_close(pch);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
|
|
pcap_close(pch);
|
|
|
|
if (err_str != NULL)
|
|
*err_str = NULL;
|
|
return caps;
|
|
}
|
|
|
|
pcap_t *
|
|
open_capture_device_pcap_open_live(interface_options *interface_opts,
|
|
int timeout, char (*open_err_str)[PCAP_ERRBUF_SIZE])
|
|
{
|
|
pcap_t *pcap_h;
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"pcap_open_live() calling using name %s, snaplen %d, promisc_mode %d.",
|
|
interface_opts->name, interface_opts->snaplen,
|
|
interface_opts->promisc_mode);
|
|
pcap_h = pcap_open_live(interface_opts->name, interface_opts->snaplen,
|
|
interface_opts->promisc_mode, timeout, *open_err_str);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"pcap_open_live() returned %p.", (void *)pcap_h);
|
|
|
|
#ifdef _WIN32
|
|
/* If the open succeeded, try to set the capture buffer size. */
|
|
if (pcap_h && interface_opts->buffer_size > 1) {
|
|
/*
|
|
* We have no mechanism to report a warning if this
|
|
* fails; we just keep capturing with the smaller buffer,
|
|
* as is the case on systems with BPF and pcap_create()
|
|
* and pcap_set_buffer_size(), where pcap_activate() just
|
|
* silently clamps the buffer size to the maximum.
|
|
*/
|
|
pcap_setbuff(pcap_h, interface_opts->buffer_size * 1024 * 1024);
|
|
}
|
|
#endif
|
|
|
|
return pcap_h;
|
|
}
|
|
|
|
/*
|
|
* Get the capabilities of a network device.
|
|
*/
|
|
if_capabilities_t *
|
|
get_if_capabilities(interface_options *interface_opts, char **err_str)
|
|
{
|
|
#if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
|
|
if_capabilities_t *caps;
|
|
char errbuf[PCAP_ERRBUF_SIZE];
|
|
pcap_t *pch;
|
|
int deflt;
|
|
data_link_info_t *data_link_info;
|
|
|
|
if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
|
|
struct pcap_rmtauth auth;
|
|
|
|
/*
|
|
* Allocate the interface capabilities structure.
|
|
*/
|
|
caps = (if_capabilities_t *)g_malloc(sizeof *caps);
|
|
|
|
auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
|
|
RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
|
|
auth.username = interface_opts->auth_username;
|
|
auth.password = interface_opts->auth_password;
|
|
|
|
/*
|
|
* WinPcap 4.1.2, and possibly earlier versions, have a bug
|
|
* wherein, when an open with an rpcap: URL fails, the error
|
|
* message for the error is not copied to errbuf and whatever
|
|
* on-the-stack junk is in errbuf is treated as the error
|
|
* message.
|
|
*
|
|
* To work around that (and any other bugs of that sort), we
|
|
* initialize errbuf to an empty string. If we get an error
|
|
* and the string is empty, we report it as an unknown error.
|
|
* (If we *don't* get an error, and the string is *non*-empty,
|
|
* that could be a warning returned, such as "can't turn
|
|
* promiscuous mode on"; we currently don't do so.)
|
|
*/
|
|
errbuf[0] = '\0';
|
|
pch = pcap_open(interface_opts->name, MIN_PACKET_SIZE, 0, 0, &auth,
|
|
errbuf);
|
|
if (pch == NULL) {
|
|
if (err_str != NULL)
|
|
*err_str = g_strdup(errbuf[0] == '\0' ? "Unknown error (pcap bug; actual error cause not reported)" : errbuf);
|
|
g_free(caps);
|
|
return NULL;
|
|
}
|
|
deflt = get_pcap_datalink(pch, interface_opts->name);
|
|
data_link_info = create_data_link_info(deflt);
|
|
caps->data_link_types = g_list_append(caps->data_link_types,
|
|
data_link_info);
|
|
pcap_close(pch);
|
|
|
|
if (err_str != NULL)
|
|
*err_str = NULL;
|
|
return caps;
|
|
}
|
|
#endif /* defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE) */
|
|
|
|
/*
|
|
* Local interface.
|
|
*/
|
|
return get_if_capabilities_local(interface_opts, err_str);
|
|
}
|
|
|
|
pcap_t *
|
|
open_capture_device(capture_options *capture_opts,
|
|
interface_options *interface_opts, int timeout,
|
|
char (*open_err_str)[PCAP_ERRBUF_SIZE])
|
|
{
|
|
pcap_t *pcap_h;
|
|
#if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
|
|
struct pcap_rmtauth auth;
|
|
#endif
|
|
|
|
/* Open the network interface to capture from it.
|
|
Some versions of libpcap may put warnings into the error buffer
|
|
if they succeed; to tell if that's happened, we have to clear
|
|
the error buffer, and check if it's still a null string. */
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "Entering open_capture_device().");
|
|
(*open_err_str)[0] = '\0';
|
|
#if defined(HAVE_PCAP_OPEN) && defined(HAVE_PCAP_REMOTE)
|
|
/*
|
|
* If we're opening a remote device, use pcap_open(); that's currently
|
|
* the only open routine that supports remote devices.
|
|
*/
|
|
if (strncmp (interface_opts->name, "rpcap://", 8) == 0) {
|
|
auth.type = interface_opts->auth_type == CAPTURE_AUTH_PWD ?
|
|
RPCAP_RMTAUTH_PWD : RPCAP_RMTAUTH_NULL;
|
|
auth.username = interface_opts->auth_username;
|
|
auth.password = interface_opts->auth_password;
|
|
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"Calling pcap_open() using name %s, snaplen %d, promisc_mode %d, datatx_udp %d, nocap_rpcap %d.",
|
|
interface_opts->name, interface_opts->snaplen,
|
|
interface_opts->promisc_mode, interface_opts->datatx_udp,
|
|
interface_opts->nocap_rpcap);
|
|
pcap_h = pcap_open(interface_opts->name, interface_opts->snaplen,
|
|
/* flags */
|
|
(interface_opts->promisc_mode ? PCAP_OPENFLAG_PROMISCUOUS : 0) |
|
|
(interface_opts->datatx_udp ? PCAP_OPENFLAG_DATATX_UDP : 0) |
|
|
(interface_opts->nocap_rpcap ? PCAP_OPENFLAG_NOCAPTURE_RPCAP : 0),
|
|
timeout, &auth, *open_err_str);
|
|
if (pcap_h == NULL) {
|
|
/* Error - did pcap actually supply an error message? */
|
|
if ((*open_err_str)[0] == '\0') {
|
|
/*
|
|
* Work around known WinPcap bug wherein
|
|
* no error message is filled in on a
|
|
* failure to open an rpcap: URL.
|
|
*/
|
|
g_strlcpy(*open_err_str,
|
|
"Unknown error (pcap bug; actual error cause not reported)",
|
|
sizeof *open_err_str);
|
|
}
|
|
}
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG,
|
|
"pcap_open() returned %p.", (void *)pcap_h);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
|
|
return pcap_h;
|
|
}
|
|
#endif
|
|
|
|
pcap_h = open_capture_device_local(capture_opts, interface_opts,
|
|
timeout, open_err_str);
|
|
g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_DEBUG, "open_capture_device %s : %s", pcap_h ? "SUCCESS" : "FAILURE", interface_opts->name);
|
|
return pcap_h;
|
|
}
|
|
|
|
#endif /* HAVE_LIBPCAP */
|
|
|
|
/*
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|