nexmon – Rev 1
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/*
* Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
* Copyright (c) 2005 - 2008 CACE Technologies, Davis (California)
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Politecnico di Torino, CACE Technologies
* nor the names of its contributors may be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <pcap-int.h>
#include <Packet32.h>
#ifdef __MINGW32__
#ifdef __MINGW64__
#include <ntddndis.h>
#else /*__MINGW64__*/
#include <ddk/ntddndis.h>
#include <ddk/ndis.h>
#endif /*__MINGW64__*/
#else /*__MINGW32__*/
#include <ntddndis.h>
#endif /*__MINGW32__*/
#ifdef HAVE_DAG_API
#include <dagnew.h>
#include <dagapi.h>
#endif /* HAVE_DAG_API */
#ifdef __MINGW32__
int* _errno();
#define errno (*_errno())
#endif /* __MINGW32__ */
static int pcap_setfilter_win32_npf(pcap_t *, struct bpf_program *);
static int pcap_setfilter_win32_dag(pcap_t *, struct bpf_program *);
static int pcap_getnonblock_win32(pcap_t *, char *);
static int pcap_setnonblock_win32(pcap_t *, int, char *);
/*dimension of the buffer in the pcap_t structure*/
#define WIN32_DEFAULT_USER_BUFFER_SIZE 256000
/*dimension of the buffer in the kernel driver NPF */
#define WIN32_DEFAULT_KERNEL_BUFFER_SIZE 1000000
/* Equivalent to ntohs(), but a lot faster under Windows */
#define SWAPS(_X) ((_X & 0xff) << 8) | (_X >> 8)
/*
* Private data for capturing on WinPcap devices.
*/
struct pcap_win {
int nonblock;
int filtering_in_kernel; /* using kernel filter */
#ifdef HAVE_DAG_API
int dag_fcs_bits; /* Number of checksum bits from link layer */
#endif
};
/*
* Header that the WinPcap driver associates to the packets.
* Once was in bpf.h
*/
struct bpf_hdr {
struct timeval bh_tstamp; /* time stamp */
bpf_u_int32 bh_caplen; /* length of captured portion */
bpf_u_int32 bh_datalen; /* original length of packet */
u_short bh_hdrlen; /* length of bpf header (this struct
plus alignment padding) */
};
CRITICAL_SECTION g_PcapCompileCriticalSection;
BOOL WINAPI DllMain(
HANDLE hinstDLL,
DWORD dwReason,
LPVOID lpvReserved
)
{
if (dwReason == DLL_PROCESS_ATTACH)
{
InitializeCriticalSection(&g_PcapCompileCriticalSection);
}
return TRUE;
}
/* Start winsock */
int
wsockinit()
{
WORD wVersionRequested;
WSADATA wsaData;
static int err = -1;
static int done = 0;
if (done)
return err;
wVersionRequested = MAKEWORD( 1, 1);
err = WSAStartup( wVersionRequested, &wsaData );
atexit ((void(*)(void))WSACleanup);
InitializeCriticalSection(&g_PcapCompileCriticalSection);
done = 1;
if ( err != 0 )
err = -1;
return err;
}
int pcap_wsockinit()
{
return wsockinit();
}
static int
pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
{
if(PacketGetStats(p->adapter, (struct bpf_stat*)ps) != TRUE){
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "PacketGetStats error: %s", pcap_win32strerror());
return -1;
}
return 0;
}
/* Set the dimension of the kernel-level capture buffer */
static int
pcap_setbuff_win32(pcap_t *p, int dim)
{
if(PacketSetBuff(p->adapter,dim)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
return -1;
}
return 0;
}
/* Set the driver working mode */
static int
pcap_setmode_win32(pcap_t *p, int mode)
{
if(PacketSetMode(p->adapter,mode)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
return -1;
}
return 0;
}
/*set the minimum amount of data that will release a read call*/
static int
pcap_setmintocopy_win32(pcap_t *p, int size)
{
if(PacketSetMinToCopy(p->adapter, size)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
return -1;
}
return 0;
}
/*return the Adapter for a pcap_t*/
static Adapter *
pcap_getadapter_win32(pcap_t *p)
{
return p->adapter;
}
static int
pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
int cc;
int n = 0;
register u_char *bp, *ep;
u_char *datap;
struct pcap_win *pw = p->priv;
cc = p->cc;
if (p->cc == 0) {
/*
* Has "pcap_breakloop()" been called?
*/
if (p->break_loop) {
/*
* Yes - clear the flag that indicates that it
* has, and return PCAP_ERROR_BREAK to indicate
* that we were told to break out of the loop.
*/
p->break_loop = 0;
return (PCAP_ERROR_BREAK);
}
/* capture the packets */
if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
return (PCAP_ERROR);
}
cc = p->Packet->ulBytesReceived;
bp = p->Packet->Buffer;
}
else
bp = p->bp;
/*
* Loop through each packet.
*/
#define bhp ((struct bpf_hdr *)bp)
ep = bp + cc;
while (1) {
register int caplen, hdrlen;
/*
* Has "pcap_breakloop()" been called?
* If so, return immediately - if we haven't read any
* packets, clear the flag and return PCAP_ERROR_BREAK
* to indicate that we were told to break out of the loop,
* otherwise leave the flag set, so that the *next* call
* will break out of the loop without having read any
* packets, and return the number of packets we've
* processed so far.
*/
if (p->break_loop) {
if (n == 0) {
p->break_loop = 0;
return (PCAP_ERROR_BREAK);
} else {
p->bp = bp;
p->cc = ep - bp;
return (n);
}
}
if (bp >= ep)
break;
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
datap = bp + hdrlen;
/*
* Short-circuit evaluation: if using BPF filter
* in kernel, no need to do it now - we already know
* the packet passed the filter.
*
* XXX - bpf_filter() should always return TRUE if
* handed a null pointer for the program, but it might
* just try to "run" the filter, so we check here.
*/
if (pw->filtering_in_kernel ||
p->fcode.bf_insns == NULL ||
bpf_filter(p->fcode.bf_insns, datap, bhp->bh_datalen, caplen)) {
/*
* XXX A bpf_hdr matches a pcap_pkthdr.
*/
(*callback)(user, (struct pcap_pkthdr*)bp, datap);
bp += Packet_WORDALIGN(caplen + hdrlen);
if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) {
p->bp = bp;
p->cc = ep - bp;
return (n);
}
} else {
/*
* Skip this packet.
*/
bp += Packet_WORDALIGN(caplen + hdrlen);
}
}
#undef bhp
p->cc = 0;
return (n);
}
#ifdef HAVE_DAG_API
static int
pcap_read_win32_dag(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
struct pcap_win *pw = p->priv;
u_char *dp = NULL;
int packet_len = 0, caplen = 0;
struct pcap_pkthdr pcap_header;
u_char *endofbuf;
int n = 0;
dag_record_t *header;
unsigned erf_record_len;
ULONGLONG ts;
int cc;
unsigned swt;
unsigned dfp = p->adapter->DagFastProcess;
cc = p->cc;
if (cc == 0) /* Get new packets only if we have processed all the ones of the previous read */
{
/* Get new packets from the network */
if(PacketReceivePacket(p->adapter, p->Packet, TRUE)==FALSE){
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
return (-1);
}
cc = p->Packet->ulBytesReceived;
if(cc == 0)
/* The timeout has expired but we no packets arrived */
return 0;
header = (dag_record_t*)p->adapter->DagBuffer;
}
else
header = (dag_record_t*)p->bp;
endofbuf = (char*)header + cc;
/*
* Cycle through the packets
*/
do
{
erf_record_len = SWAPS(header->rlen);
if((char*)header + erf_record_len > endofbuf)
break;
/* Increase the number of captured packets */
pw->stat.ps_recv++;
/* Find the beginning of the packet */
dp = ((u_char *)header) + dag_record_size;
/* Determine actual packet len */
switch(header->type)
{
case TYPE_ATM:
packet_len = ATM_SNAPLEN;
caplen = ATM_SNAPLEN;
dp += 4;
break;
case TYPE_ETH:
swt = SWAPS(header->wlen);
packet_len = swt - (pw->dag_fcs_bits);
caplen = erf_record_len - dag_record_size - 2;
if (caplen > packet_len)
{
caplen = packet_len;
}
dp += 2;
break;
case TYPE_HDLC_POS:
swt = SWAPS(header->wlen);
packet_len = swt - (pw->dag_fcs_bits);
caplen = erf_record_len - dag_record_size;
if (caplen > packet_len)
{
caplen = packet_len;
}
break;
}
if(caplen > p->snapshot)
caplen = p->snapshot;
/*
* Has "pcap_breakloop()" been called?
* If so, return immediately - if we haven't read any
* packets, clear the flag and return -2 to indicate
* that we were told to break out of the loop, otherwise
* leave the flag set, so that the *next* call will break
* out of the loop without having read any packets, and
* return the number of packets we've processed so far.
*/
if (p->break_loop)
{
if (n == 0)
{
p->break_loop = 0;
return (-2);
}
else
{
p->bp = (char*)header;
p->cc = endofbuf - (char*)header;
return (n);
}
}
if(!dfp)
{
/* convert between timestamp formats */
ts = header->ts;
pcap_header.ts.tv_sec = (int)(ts >> 32);
ts = (ts & 0xffffffffi64) * 1000000;
ts += 0x80000000; /* rounding */
pcap_header.ts.tv_usec = (int)(ts >> 32);
if (pcap_header.ts.tv_usec >= 1000000) {
pcap_header.ts.tv_usec -= 1000000;
pcap_header.ts.tv_sec++;
}
}
/* No underlaying filtering system. We need to filter on our own */
if (p->fcode.bf_insns)
{
if (bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen) == 0)
{
/* Move to next packet */
header = (dag_record_t*)((char*)header + erf_record_len);
continue;
}
}
/* Fill the header for the user suppplied callback function */
pcap_header.caplen = caplen;
pcap_header.len = packet_len;
/* Call the callback function */
(*callback)(user, &pcap_header, dp);
/* Move to next packet */
header = (dag_record_t*)((char*)header + erf_record_len);
/* Stop if the number of packets requested by user has been reached*/
if (++n >= cnt && !PACKET_COUNT_IS_UNLIMITED(cnt))
{
p->bp = (char*)header;
p->cc = endofbuf - (char*)header;
return (n);
}
}
while((u_char*)header < endofbuf);
return 1;
}
#endif /* HAVE_DAG_API */
/* Send a packet to the network */
static int
pcap_inject_win32(pcap_t *p, const void *buf, size_t size){
LPPACKET PacketToSend;
PacketToSend=PacketAllocatePacket();
if (PacketToSend == NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
return -1;
}
PacketInitPacket(PacketToSend,(PVOID)buf,size);
if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketSendPacket failed");
PacketFreePacket(PacketToSend);
return -1;
}
PacketFreePacket(PacketToSend);
/*
* We assume it all got sent if "PacketSendPacket()" succeeded.
* "pcap_inject()" is expected to return the number of bytes
* sent.
*/
return size;
}
static void
pcap_cleanup_win32(pcap_t *p)
{
if (p->adapter != NULL) {
PacketCloseAdapter(p->adapter);
p->adapter = NULL;
}
if (p->Packet) {
PacketFreePacket(p->Packet);
p->Packet = NULL;
}
pcap_cleanup_live_common(p);
}
static int
pcap_activate_win32(pcap_t *p)
{
struct pcap_win *pw = p->priv;
NetType type;
if (p->opt.rfmon) {
/*
* No monitor mode on Windows. It could be done on
* Vista with drivers that support the native 802.11
* mechanism and monitor mode.
*/
return (PCAP_ERROR_RFMON_NOTSUP);
}
/* Init WinSock */
wsockinit();
p->adapter = PacketOpenAdapter(p->opt.source);
if (p->adapter == NULL)
{
/* Adapter detected but we are not able to open it. Return failure. */
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
return PCAP_ERROR;
}
/*get network type*/
if(PacketGetNetType (p->adapter,&type) == FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Cannot determine the network type: %s", pcap_win32strerror());
goto bad;
}
/*Set the linktype*/
switch (type.LinkType)
{
case NdisMediumWan:
p->linktype = DLT_EN10MB;
break;
case NdisMedium802_3:
p->linktype = DLT_EN10MB;
/*
* This is (presumably) a real Ethernet capture; give it a
* link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so
* that an application can let you choose it, in case you're
* capturing DOCSIS traffic that a Cisco Cable Modem
* Termination System is putting out onto an Ethernet (it
* doesn't put an Ethernet header onto the wire, it puts raw
* DOCSIS frames out on the wire inside the low-level
* Ethernet framing).
*/
p->dlt_list = (u_int *) malloc(sizeof(u_int) * 2);
/*
* If that fails, just leave the list empty.
*/
if (p->dlt_list != NULL) {
p->dlt_list[0] = DLT_EN10MB;
p->dlt_list[1] = DLT_DOCSIS;
p->dlt_count = 2;
}
break;
case NdisMediumFddi:
p->linktype = DLT_FDDI;
break;
case NdisMedium802_5:
p->linktype = DLT_IEEE802;
break;
case NdisMediumArcnetRaw:
p->linktype = DLT_ARCNET;
break;
case NdisMediumArcnet878_2:
p->linktype = DLT_ARCNET;
break;
case NdisMediumAtm:
p->linktype = DLT_ATM_RFC1483;
break;
case NdisMediumCHDLC:
p->linktype = DLT_CHDLC;
break;
case NdisMediumPPPSerial:
p->linktype = DLT_PPP_SERIAL;
break;
case NdisMediumNull:
p->linktype = DLT_NULL;
break;
case NdisMediumBare80211:
p->linktype = DLT_IEEE802_11;
break;
case NdisMediumRadio80211:
p->linktype = DLT_IEEE802_11_RADIO;
break;
case NdisMediumPpi:
p->linktype = DLT_PPI;
break;
default:
p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/
break;
}
/* Set promiscuous mode */
if (p->opt.promisc)
{
if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS) == FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to promiscuous mode");
goto bad;
}
}
else
{
if (PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL) == FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to set hardware filter to non-promiscuous mode");
goto bad;
}
}
/* Set the buffer size */
p->bufsize = WIN32_DEFAULT_USER_BUFFER_SIZE;
/* allocate Packet structure used during the capture */
if((p->Packet = PacketAllocatePacket())==NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
goto bad;
}
if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
{
/*
* Traditional Adapter
*/
/*
* If the buffer size wasn't explicitly set, default to
* WIN32_DEFAULT_USER_BUFFER_SIZE.
*/
if (p->opt.buffer_size == 0)
p->opt.buffer_size = WIN32_DEFAULT_KERNEL_BUFFER_SIZE;
if(PacketSetBuff(p->adapter,p->opt.buffer_size)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
goto bad;
}
p->buffer = (u_char *)malloc(p->bufsize);
if (p->buffer == NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
goto bad;
}
PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
if (p->opt.immediate)
{
/* tell the driver to copy the buffer as soon as data arrives */
if(PacketSetMinToCopy(p->adapter,0)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
goto bad;
}
}
else
{
/* tell the driver to copy the buffer only if it contains at least 16K */
if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s", pcap_win32strerror());
goto bad;
}
}
}
else
#ifdef HAVE_DAG_API
{
/*
* Dag Card
*/
LONG status;
HKEY dagkey;
DWORD lptype;
DWORD lpcbdata;
int postype = 0;
char keyname[512];
snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
"SYSTEM\\CurrentControlSet\\Services\\DAG",
strstr(_strlwr(p->opt.source), "dag"));
do
{
status = RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyname, 0, KEY_READ, &dagkey);
if(status != ERROR_SUCCESS)
break;
status = RegQueryValueEx(dagkey,
"PosType",
NULL,
&lptype,
(char*)&postype,
&lpcbdata);
if(status != ERROR_SUCCESS)
{
postype = 0;
}
RegCloseKey(dagkey);
}
while(FALSE);
p->snapshot = PacketSetSnapLen(p->adapter, snaplen);
/* Set the length of the FCS associated to any packet. This value
* will be subtracted to the packet length */
pw->dag_fcs_bits = p->adapter->DagFcsLen;
}
#else
goto bad;
#endif /* HAVE_DAG_API */
PacketSetReadTimeout(p->adapter, p->opt.timeout);
#ifdef HAVE_DAG_API
if(p->adapter->Flags & INFO_FLAG_DAG_CARD)
{
/* install dag specific handlers for read and setfilter */
p->read_op = pcap_read_win32_dag;
p->setfilter_op = pcap_setfilter_win32_dag;
}
else
{
#endif /* HAVE_DAG_API */
/* install traditional npf handlers for read and setfilter */
p->read_op = pcap_read_win32_npf;
p->setfilter_op = pcap_setfilter_win32_npf;
#ifdef HAVE_DAG_API
}
#endif /* HAVE_DAG_API */
p->setdirection_op = NULL; /* Not implemented. */
/* XXX - can this be implemented on some versions of Windows? */
p->inject_op = pcap_inject_win32;
p->set_datalink_op = NULL; /* can't change data link type */
p->getnonblock_op = pcap_getnonblock_win32;
p->setnonblock_op = pcap_setnonblock_win32;
p->stats_op = pcap_stats_win32;
p->setbuff_op = pcap_setbuff_win32;
p->setmode_op = pcap_setmode_win32;
p->setmintocopy_op = pcap_setmintocopy_win32;
p->getadapter_op = pcap_getadapter_win32;
p->cleanup_op = pcap_cleanup_win32;
return (0);
bad:
pcap_cleanup_win32(p);
return (PCAP_ERROR);
}
pcap_t *
pcap_create_interface(const char *device, char *ebuf)
{
pcap_t *p;
if (strlen(device) == 1)
{
/*
* It's probably a unicode string
* Convert to ascii and pass it to pcap_create_common
*
* This wonderful hack is needed because pcap_lookupdev still returns
* unicode strings, and it's used by windump when no device is specified
* in the command line
*/
size_t length;
char* deviceAscii;
length = wcslen((wchar_t*)device);
deviceAscii = (char*)malloc(length + 1);
if (deviceAscii == NULL)
{
snprintf(ebuf, PCAP_ERRBUF_SIZE, "Malloc failed");
return NULL;
}
snprintf(deviceAscii, length + 1, "%ws", (wchar_t*)device);
p = pcap_create_common(deviceAscii, ebuf, sizeof (struct pcap_win));
free(deviceAscii);
}
else
{
p = pcap_create_common(device, ebuf, sizeof (struct pcap_win));
}
if (p == NULL)
return (NULL);
p->activate_op = pcap_activate_win32;
return (p);
}
static int
pcap_setfilter_win32_npf(pcap_t *p, struct bpf_program *fp)
{
struct pcap_win *pw = p->priv;
if(PacketSetBpf(p->adapter,fp)==FALSE){
/*
* Kernel filter not installed.
*
* XXX - we don't know whether this failed because:
*
* the kernel rejected the filter program as invalid,
* in which case we should fall back on userland
* filtering;
*
* the kernel rejected the filter program as too big,
* in which case we should again fall back on
* userland filtering;
*
* there was some other problem, in which case we
* should probably report an error.
*
* For NPF devices, the Win32 status will be
* STATUS_INVALID_DEVICE_REQUEST for invalid
* filters, but I don't know what it'd be for
* other problems, and for some other devices
* it might not be set at all.
*
* So we just fall back on userland filtering in
* all cases.
*/
/*
* install_bpf_program() validates the program.
*
* XXX - what if we already have a filter in the kernel?
*/
if (install_bpf_program(p, fp) < 0)
return (-1);
pw->filtering_in_kernel = 0; /* filtering in userland */
return (0);
}
/*
* It worked.
*/
pw->filtering_in_kernel = 1; /* filtering in the kernel */
/*
* Discard any previously-received packets, as they might have
* passed whatever filter was formerly in effect, but might
* not pass this filter (BIOCSETF discards packets buffered
* in the kernel, so you can lose packets in any case).
*/
p->cc = 0;
return (0);
}
/*
* We filter at user level, since the kernel driver does't process the packets
*/
static int
pcap_setfilter_win32_dag(pcap_t *p, struct bpf_program *fp) {
if(!fp)
{
strncpy(p->errbuf, "setfilter: No filter specified", sizeof(p->errbuf));
return -1;
}
/* Install a user level filter */
if (install_bpf_program(p, fp) < 0)
{
snprintf(p->errbuf, sizeof(p->errbuf),
"setfilter, unable to install the filter: %s", pcap_strerror(errno));
return -1;
}
return (0);
}
static int
pcap_getnonblock_win32(pcap_t *p, char *errbuf)
{
struct pcap_win *pw = p->priv;
/*
* XXX - if there were a PacketGetReadTimeout() call, we
* would use it, and return 1 if the timeout is -1
* and 0 otherwise.
*/
return (pw->nonblock);
}
static int
pcap_setnonblock_win32(pcap_t *p, int nonblock, char *errbuf)
{
struct pcap_win *pw = p->priv;
int newtimeout;
if (nonblock) {
/*
* Set the read timeout to -1 for non-blocking mode.
*/
newtimeout = -1;
} else {
/*
* Restore the timeout set when the device was opened.
* (Note that this may be -1, in which case we're not
* really leaving non-blocking mode.)
*/
newtimeout = p->opt.timeout;
}
if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
snprintf(errbuf, PCAP_ERRBUF_SIZE,
"PacketSetReadTimeout: %s", pcap_win32strerror());
return (-1);
}
pw->nonblock = (newtimeout == -1);
return (0);
}
/*platform-dependent routine to add devices other than NDIS interfaces*/
int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
return (0);
}