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wireshark/capture_wpcap_packet.c

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/* capture_wpcap_packet.c
* WinPcap-specific interfaces for low-level information (packet.dll).
* We load WinPcap at run
* time, so that we only need one Wireshark binary and one TShark binary
* for Windows, regardless of whether WinPcap is installed or not.
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 2001 Gerald Combs
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if defined HAVE_LIBPCAP && defined _WIN32
#include <glib.h>
#include <gmodule.h>
#include <pcap.h>
/* XXX - yes, I know, I should move cppmagic.h to a generic location. */
#include "tools/lemon/cppmagic.h"
#include <epan/value_string.h>
#include <winsock2.h> /* Needed here to force a definition of WINVER */
/* for some (all ?) Microsoft compilers newer than vc6. */
/* (If windows.h were used instead, there might be */
/* issues re winsock.h included before winsock2.h ) */
#include <windowsx.h>
#include <Ntddndis.h>
#include "capture_wpcap_packet.h"
/* packet32.h requires sockaddr_storage
* whether sockaddr_storage is defined or not depends on the Platform SDK
* version installed. The only one not defining it is the SDK that comes
* with MSVC 6.0 (WINVER 0x0400).
*
* copied from RFC2553 (and slightly modified because of datatypes) ...
* XXX - defined more than once, move this to a header file */
#ifndef WINVER
#error WINVER not defined ....
#endif
#if (WINVER <= 0x0400) && defined(_MSC_VER)
typedef unsigned short eth_sa_family_t;
/*
* Desired design of maximum size and alignment
*/
#define ETH_SS_MAXSIZE 128 /* Implementation specific max size */
#define ETH_SS_ALIGNSIZE (sizeof (gint64 /*int64_t*/))
/* Implementation specific desired alignment */
/*
* Definitions used for sockaddr_storage structure paddings design.
*/
#define ETH_SS_PAD1SIZE (ETH_SS_ALIGNSIZE - sizeof (eth_sa_family_t))
#define ETH_SS_PAD2SIZE (ETH_SS_MAXSIZE - (sizeof (eth_sa_family_t) + \
ETH_SS_PAD1SIZE + ETH_SS_ALIGNSIZE))
struct sockaddr_storage {
eth_sa_family_t __ss_family; /* address family */
/* Following fields are implementation specific */
char __ss_pad1[ETH_SS_PAD1SIZE];
/* 6 byte pad, this is to make implementation */
/* specific pad up to alignment field that */
/* follows explicit in the data structure */
gint64 /*int64_t*/ __ss_align; /* field to force desired structure */
/* storage alignment */
char __ss_pad2[ETH_SS_PAD2SIZE];
/* 112 byte pad to achieve desired size, */
/* _SS_MAXSIZE value minus size of ss_family */
/* __ss_pad1, __ss_align fields is 112 */
};
/* ... copied from RFC2553 */
#endif /* WINVER */
#include <Packet32.h>
gboolean has_wpacket = FALSE;
/* This module will use the PacketRequest function in packet.dll (coming with WinPcap) to "directly" access
* the Win32 NDIS network driver(s) and ask for various values (status, statistics, ...).
*
* Unfortunately, the definitions required for this are not available through the usual windows header files,
* but require the Windows "Device Driver Kit" which is not available for free :-(
*
* Fortunately, the definitions needed to access the various NDIS values are available from various OSS projects:
* - WinPcap in Ntddndis.h
* - Ndiswrapper in driver/ndis.h and driver/iw_ndis.h
* - cygwin (MingW?) in usr/include/w32api/ddk/ndis.h and ntddndis.h
* - FreeBSD (netperf)
*/
/* The MSDN description of the NDIS driver API is available at:
/* MSDN Home > MSDN Library > Win32 and COM Development > Driver Development Kit > Network Devices and Protocols > Reference */
/* "NDIS Objects" */
/* http://msdn.microsoft.com/library/default.asp?url=/library/en-us/network/hh/network/21oidovw_d55042e5-0b8a-4439-8ef2-be7331e98464.xml.asp */
/* Some more interesting links:
* http://sourceforge.net/projects/ndiswrapper/
* http://www.osronline.com/lists_archive/windbg/thread521.html
* http://cvs.sourceforge.net/viewcvs.py/mingw/w32api/include/ddk/ndis.h?view=markup
* http://cvs.sourceforge.net/viewcvs.py/mingw/w32api/include/ddk/ntddndis.h?view=markup
*/
/******************************************************************************************************************************/
/* stuff to load WinPcap's packet.dll and the functions required from it */
static PCHAR (*p_PacketGetVersion) (void);
static LPADAPTER (*p_PacketOpenAdapter) (char *adaptername);
static void (*p_PacketCloseAdapter) (LPADAPTER);
static int (*p_PacketRequest) (LPADAPTER, int, void *);
typedef struct {
const char *name;
gpointer *ptr;
gboolean optional;
} symbol_table_t;
#define SYM(x, y) { STRINGIFY(x) , (gpointer) &CONCAT(p_,x), y }
void
wpcap_packet_load(void)
{
/* These are the symbols I need or want from packet.dll */
static const symbol_table_t symbols[] = {
SYM(PacketGetVersion, FALSE),
SYM(PacketOpenAdapter, FALSE),
SYM(PacketCloseAdapter, FALSE),
SYM(PacketRequest, FALSE),
{ NULL, NULL, FALSE }
};
GModule *wh; /* wpcap handle */
const symbol_table_t *sym;
wh = g_module_open("packet", 0);
if (!wh) {
return;
}
sym = symbols;
while (sym->name) {
if (!g_module_symbol(wh, sym->name, sym->ptr)) {
if (sym->optional) {
/*
* We don't care if it's missing; we just
* don't use it.
*/
*sym->ptr = NULL;
} else {
/*
* We require this symbol.
*/
return;
}
}
sym++;
}
has_wpacket = TRUE;
}
/******************************************************************************************************************************/
/* functions to access the NDIS driver values */
/* get dll version */
char *
wpcap_packet_get_version(void)
{
if(!has_wpacket) {
return NULL;
}
return p_PacketGetVersion();
}
/* open the interface */
void *
wpcap_packet_open(char *if_name)
{
LPADAPTER adapter;
g_assert(has_wpacket);
adapter = p_PacketOpenAdapter(if_name);
return adapter;
}
/* close the interface */
void
wpcap_packet_close(void *adapter)
{
g_assert(has_wpacket);
p_PacketCloseAdapter(adapter);
}
/* do a packet request call */
int
wpcap_packet_request(void *adapter, ULONG Oid, int set, char *value, unsigned int *length)
{
BOOLEAN Status;
ULONG IoCtlBufferLength=(sizeof(PACKET_OID_DATA) + (*length) - 1);
PPACKET_OID_DATA OidData;
g_assert(has_wpacket);
if(p_PacketRequest == NULL) {
g_warning("packet_request not available\n");
return 0;
}
/* get a buffer suitable for PacketRequest() */
OidData=GlobalAllocPtr(GMEM_MOVEABLE | GMEM_ZEROINIT,IoCtlBufferLength);
if (OidData == NULL) {
g_warning("GlobalAllocPtr failed for %u\n", IoCtlBufferLength);
return 0;
}
OidData->Oid = Oid;
OidData->Length = *length;
memcpy(OidData->Data, value, *length);
Status = p_PacketRequest(adapter, set, OidData);
if(Status) {
if(OidData->Length <= *length) {
/* copy value from driver */
memcpy(value, OidData->Data, OidData->Length);
*length = OidData->Length;
} else {
/* the driver returned a value that is longer than expected (and longer than the given buffer) */
g_warning("returned oid too long, Oid: 0x%x OidLen:%u MaxLen:%u", Oid, OidData->Length, *length);
Status = FALSE;
}
}
GlobalFreePtr (OidData);
if(Status) {
return 1;
} else {
return 0;
}
}
/* get an UINT value using the packet request call */
int
wpcap_packet_request_uint(void *adapter, ULONG Oid, UINT *value)
{
BOOLEAN Status;
int length = sizeof(UINT);
Status = wpcap_packet_request(adapter, Oid, FALSE /* !set */, (char *) value, &length);
if(Status && length == sizeof(UINT)) {
return 1;
} else {
return 0;
}
}
/* get an ULONG value using the NDIS packet request call */
int
wpcap_packet_request_ulong(void *adapter, ULONG Oid, ULONG *value)
{
BOOLEAN Status;
int length = sizeof(ULONG);
Status = wpcap_packet_request(adapter, Oid, FALSE /* !set */, (char *) value, &length);
if(Status && length == sizeof(ULONG)) {
return 1;
} else {
return 0;
}
}
#else /* HAVE_LIBPCAP && _WIN32 */
void
wpcap_packet_load(void)
{
return;
}
#endif /* HAVE_LIBPCAP */
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* ex: set shiftwidth=4 tabstop=8 expandtab
* :indentSize=4:tabSize=8:noTabs=true:
*/
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