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/*
* Copyright (c) 1999 - 2005 NetGroup, Politecnico di Torino (Italy)
* Copyright (c) 2005 - 2010 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.
*
*/
#define PCAP_DONT_INCLUDE_PCAP_BPF_H
#include <Packet32.h>
#include <pcap-int.h>
#include <pcap/dlt.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
};
BOOL WINAPI DllMain(
HANDLE hinstDLL,
DWORD dwReason,
LPVOID lpvReserved
)
{
return (TRUE);
}
/* Start winsock */
int
wsockinit(void)
{
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);
done = 1;
if ( err != 0 )
err = -1;
return (err);
}
int
pcap_wsockinit(void)
{
return (wsockinit());
}
static int
pcap_stats_win32(pcap_t *p, struct pcap_stat *ps)
{
struct bpf_stat bstats;
char errbuf[PCAP_ERRBUF_SIZE+1];
/*
* Try to get statistics.
*
* (Please note - "struct pcap_stat" is *not* the same as
* WinPcap's "struct bpf_stat". It might currently have the
* same layout, but let's not cheat.
*
* Note also that we don't fill in ps_capt, as we might have
* been called by code compiled against an earlier version of
* WinPcap that didn't have ps_capt, in which case filling it
* in would stomp on whatever comes after the structure passed
* to us.
*/
if (!PacketGetStats(p->adapter, &bstats)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"PacketGetStats error: %s", errbuf);
return (-1);
}
ps->ps_recv = bstats.bs_recv;
ps->ps_drop = bstats.bs_drop;
/*
* XXX - PacketGetStats() doesn't fill this in, so we just
* return 0.
*/
#if 0
ps->ps_ifdrop = bstats.ps_ifdrop;
#else
ps->ps_ifdrop = 0;
#endif
return (0);
}
/*
* Win32-only routine for getting statistics.
*
* This way is definitely safer than passing the pcap_stat * from the userland.
* In fact, there could happen than the user allocates a variable which is not
* big enough for the new structure, and the library will write in a zone
* which is not allocated to this variable.
*
* In this way, we're pretty sure we are writing on memory allocated to this
* variable.
*
* XXX - but this is the wrong way to handle statistics. Instead, we should
* have an API that returns data in a form like the Options section of a
* pcapng Interface Statistics Block:
*
* http://xml2rfc.tools.ietf.org/cgi-bin/xml2rfc.cgi?url=https://raw.githubusercontent.com/pcapng/pcapng/master/draft-tuexen-opsawg-pcapng.xml&modeAsFormat=html/ascii&type=ascii#rfc.section.4.6
*
* which would let us add new statistics straightforwardly and indicate which
* statistics we are and are *not* providing, rather than having to provide
* possibly-bogus values for statistics we can't provide.
*/
struct pcap_stat *
pcap_stats_ex_win32(pcap_t *p, int *pcap_stat_size)
{
struct bpf_stat bstats;
char errbuf[PCAP_ERRBUF_SIZE+1];
*pcap_stat_size = sizeof (p->stat);
/*
* Try to get statistics.
*
* (Please note - "struct pcap_stat" is *not* the same as
* WinPcap's "struct bpf_stat". It might currently have the
* same layout, but let's not cheat.)
*/
if (!PacketGetStatsEx(p->adapter, &bstats)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"PacketGetStatsEx error: %s", errbuf);
return (NULL);
}
p->stat.ps_recv = bstats.bs_recv;
p->stat.ps_drop = bstats.bs_drop;
p->stat.ps_ifdrop = bstats.ps_ifdrop;
#ifdef HAVE_REMOTE
p->stat.ps_capt = bstats.bs_capt;
#endif
return (&p->stat);
}
/* 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)
{
pcap_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)
{
pcap_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)
{
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: unable to set the requested mintocopy size");
return (-1);
}
return (0);
}
static HANDLE
pcap_getevent_win32(pcap_t *p)
{
return (PacketGetReadEvent(p->adapter));
}
static int
pcap_oid_get_request_win32(pcap_t *p, bpf_u_int32 oid, void *data, size_t *lenp)
{
PACKET_OID_DATA *oid_data_arg;
char errbuf[PCAP_ERRBUF_SIZE+1];
/*
* Allocate a PACKET_OID_DATA structure to hand to PacketRequest().
* It should be big enough to hold "*lenp" bytes of data; it
* will actually be slightly larger, as PACKET_OID_DATA has a
* 1-byte data array at the end, standing in for the variable-length
* data that's actually there.
*/
oid_data_arg = malloc(sizeof (PACKET_OID_DATA) + *lenp);
if (oid_data_arg == NULL) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Couldn't allocate argument buffer for PacketRequest");
return (PCAP_ERROR);
}
/*
* No need to copy the data - we're doing a fetch.
*/
oid_data_arg->Oid = oid;
oid_data_arg->Length = (ULONG)(*lenp); /* XXX - check for ridiculously large value? */
if (!PacketRequest(p->adapter, FALSE, oid_data_arg)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error calling PacketRequest: %s", errbuf);
free(oid_data_arg);
return (PCAP_ERROR);
}
/*
* Get the length actually supplied.
*/
*lenp = oid_data_arg->Length;
/*
* Copy back the data we fetched.
*/
memcpy(data, oid_data_arg->Data, *lenp);
free(oid_data_arg);
return (0);
}
static int
pcap_oid_set_request_win32(pcap_t *p, bpf_u_int32 oid, const void *data,
size_t *lenp)
{
PACKET_OID_DATA *oid_data_arg;
char errbuf[PCAP_ERRBUF_SIZE+1];
/*
* Allocate a PACKET_OID_DATA structure to hand to PacketRequest().
* It should be big enough to hold "*lenp" bytes of data; it
* will actually be slightly larger, as PACKET_OID_DATA has a
* 1-byte data array at the end, standing in for the variable-length
* data that's actually there.
*/
oid_data_arg = malloc(sizeof (PACKET_OID_DATA) + *lenp);
if (oid_data_arg == NULL) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Couldn't allocate argument buffer for PacketRequest");
return (PCAP_ERROR);
}
oid_data_arg->Oid = oid;
oid_data_arg->Length = (ULONG)(*lenp); /* XXX - check for ridiculously large value? */
memcpy(oid_data_arg->Data, data, *lenp);
if (!PacketRequest(p->adapter, TRUE, oid_data_arg)) {
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error calling PacketRequest: %s", errbuf);
free(oid_data_arg);
return (PCAP_ERROR);
}
/*
* Get the length actually copied.
*/
*lenp = oid_data_arg->Length;
/*
* No need to copy the data - we're doing a set.
*/
free(oid_data_arg);
return (0);
}
static u_int
pcap_sendqueue_transmit_win32(pcap_t *p, pcap_send_queue *queue, int sync)
{
u_int res;
char errbuf[PCAP_ERRBUF_SIZE+1];
if (p->adapter==NULL) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Cannot transmit a queue to an offline capture or to a TurboCap port");
return (0);
}
res = PacketSendPackets(p->adapter,
queue->buffer,
queue->len,
(BOOLEAN)sync);
if(res != queue->len){
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error opening adapter: %s", errbuf);
}
return (res);
}
static int
pcap_setuserbuffer_win32(pcap_t *p, int size)
{
unsigned char *new_buff;
if (size<=0) {
/* Bogus parameter */
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error: invalid size %d",size);
return (-1);
}
/* Allocate the buffer */
new_buff=(unsigned char*)malloc(sizeof(char)*size);
if (!new_buff) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error: not enough memory");
return (-1);
}
free(p->buffer);
p->buffer=new_buff;
p->bufsize=size;
return (0);
}
static int
pcap_live_dump_win32(pcap_t *p, char *filename, int maxsize, int maxpacks)
{
BOOLEAN res;
/* Set the packet driver in dump mode */
res = PacketSetMode(p->adapter, PACKET_MODE_DUMP);
if(res == FALSE){
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error setting dump mode");
return (-1);
}
/* Set the name of the dump file */
res = PacketSetDumpName(p->adapter, filename, (int)strlen(filename));
if(res == FALSE){
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error setting kernel dump file name");
return (-1);
}
/* Set the limits of the dump file */
res = PacketSetDumpLimits(p->adapter, maxsize, maxpacks);
return (0);
}
static int
pcap_live_dump_ended_win32(pcap_t *p, int sync)
{
return (PacketIsDumpEnded(p->adapter, (BOOLEAN)sync));
}
static PAirpcapHandle
pcap_get_airpcap_handle_win32(pcap_t *p)
{
#ifdef HAVE_AIRPCAP_API
return (PacketGetAirPcapHandle(p->adapter));
#else
return (NULL);
#endif /* HAVE_AIRPCAP_API */
}
static int
pcap_read_win32_npf(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
PACKET Packet;
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.
*
* The PACKET structure had a bunch of extra stuff for
* Windows 9x/Me, but the only interesting data in it
* in the versions of Windows that we support is just
* a copy of p->buffer, a copy of p->buflen, and the
* actual number of bytes read returned from
* PacketReceivePacket(), none of which has to be
* retained from call to call, so we just keep one on
* the stack.
*/
PacketInitPacket(&Packet, (BYTE *)p->buffer, p->bufsize);
if (!PacketReceivePacket(p->adapter, &Packet, TRUE)) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
return (PCAP_ERROR);
}
cc = Packet.ulBytesReceived;
bp = p->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;
PACKET Packet;
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.
*
* The PACKET structure had a bunch of extra stuff for
* Windows 9x/Me, but the only interesting data in it
* in the versions of Windows that we support is just
* a copy of p->buffer, a copy of p->buflen, and the
* actual number of bytes read returned from
* PacketReceivePacket(), none of which has to be
* retained from call to call, so we just keep one on
* the stack.
*/
PacketInitPacket(&Packet, (BYTE *)p->buffer, p->bufsize);
if (!PacketReceivePacket(p->adapter, &Packet, TRUE)) {
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
return (-1);
}
cc = 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 */
p->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)
{
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "send error: PacketAllocatePacket failed");
return (-1);
}
PacketInitPacket(PacketToSend, (PVOID)buf, (UINT)size);
if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
pcap_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 ((int)size);
}
static void
pcap_cleanup_win32(pcap_t *p)
{
if (p->adapter != NULL) {
PacketCloseAdapter(p->adapter);
p->adapter = NULL;
}
pcap_cleanup_live_common(p);
}
static int
pcap_activate_win32(pcap_t *p)
{
#ifdef HAVE_DAG_API
struct pcap_win *pw = p->priv;
#endif
NetType type;
char errbuf[PCAP_ERRBUF_SIZE+1];
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.device);
if (p->adapter == NULL)
{
/* Adapter detected but we are not able to open it. Return failure. */
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error opening adapter: %s", errbuf);
return (PCAP_ERROR);
}
/*get network type*/
if(PacketGetNetType (p->adapter,&type) == FALSE)
{
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Cannot determine the network type: %s", errbuf);
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)
{
pcap_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)
{
pcap_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;
if(!(p->adapter->Flags & INFO_FLAG_DAG_CARD))
{
/*
* Traditional Adapter
*/
/*
* If the buffer size wasn't explicitly set, default to
* WIN32_DEFAULT_KERNEL_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)
{
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: not enough memory to allocate the kernel buffer");
goto bad;
}
p->buffer = malloc(p->bufsize);
if (p->buffer == NULL)
{
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
goto bad;
}
if (p->opt.immediate)
{
/* tell the driver to copy the buffer as soon as data arrives */
if(PacketSetMinToCopy(p->adapter,0)==FALSE)
{
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error calling PacketSetMinToCopy: %s",
errbuf);
goto bad;
}
}
else
{
/* tell the driver to copy the buffer only if it contains at least 16K */
if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
{
pcap_win32_err_to_str(GetLastError(), errbuf);
pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"Error calling PacketSetMinToCopy: %s",
errbuf);
goto bad;
}
}
}
else
#ifdef HAVE_DAG_API
{
/*
* Dag Card
*/
LONG status;
HKEY dagkey;
DWORD lptype;
DWORD lpcbdata;
int postype = 0;
char keyname[512];
pcap_snprintf(keyname, sizeof(keyname), "%s\\CardParams\\%s",
"SYSTEM\\CurrentControlSet\\Services\\DAG",
strstr(_strlwr(p->opt.device), "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->stats_ex_op = pcap_stats_ex_win32;
p->setbuff_op = pcap_setbuff_win32;
p->setmode_op = pcap_setmode_win32;
p->setmintocopy_op = pcap_setmintocopy_win32;
p->getevent_op = pcap_getevent_win32;
p->oid_get_request_op = pcap_oid_get_request_win32;
p->oid_set_request_op = pcap_oid_set_request_win32;
p->sendqueue_transmit_op = pcap_sendqueue_transmit_win32;
p->setuserbuffer_op = pcap_setuserbuffer_win32;
p->live_dump_op = pcap_live_dump_win32;
p->live_dump_ended_op = pcap_live_dump_ended_win32;
p->get_airpcap_handle_op = pcap_get_airpcap_handle_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 _U_, char *ebuf)
{
pcap_t *p;
p = pcap_create_common(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)
{
pcap_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;
char win_errbuf[PCAP_ERRBUF_SIZE+1];
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. However, although
* the timeout argument to pcap_set_timeout() and
* pcap_open_live() is an int, you're not supposed to
* supply a negative value, so that "shouldn't happen".)
*/
newtimeout = p->opt.timeout;
}
if (!PacketSetReadTimeout(p->adapter, newtimeout)) {
pcap_win32_err_to_str(GetLastError(), win_errbuf);
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"PacketSetReadTimeout: %s", win_errbuf);
return (-1);
}
pw->nonblock = (newtimeout == -1);
return (0);
}
static int
pcap_add_if_win32(pcap_if_t **devlist, char *name, bpf_u_int32 flags,
const char *description, char *errbuf)
{
pcap_if_t *curdev;
npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
LONG if_addr_size;
int res = 0;
if_addr_size = MAX_NETWORK_ADDRESSES;
/*
* Add an entry for this interface, with no addresses.
*/
if (add_or_find_if(&curdev, devlist, name, flags, description,
errbuf) == -1) {
/*
* Failure.
*/
return (-1);
}
/*
* Get the list of addresses for the interface.
*/
if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) {
/*
* Failure.
*
* We don't return an error, because this can happen with
* NdisWan interfaces, and we want to supply them even
* if we can't supply their addresses.
*
* We return an entry with an empty address list.
*/
return (0);
}
/*
* Now add the addresses.
*/
while (if_addr_size-- > 0) {
/*
* "curdev" is an entry for this interface; add an entry for
* this address to its list of addresses.
*/
if(curdev == NULL)
break;
res = add_addr_to_dev(curdev,
(struct sockaddr *)&if_addrs[if_addr_size].IPAddress,
sizeof (struct sockaddr_storage),
(struct sockaddr *)&if_addrs[if_addr_size].SubnetMask,
sizeof (struct sockaddr_storage),
(struct sockaddr *)&if_addrs[if_addr_size].Broadcast,
sizeof (struct sockaddr_storage),
NULL,
0,
errbuf);
if (res == -1) {
/*
* Failure.
*/
break;
}
}
return (res);
}
int
pcap_platform_finddevs(pcap_if_t **alldevsp, char *errbuf)
{
pcap_if_t *devlist = NULL;
int ret = 0;
const char *desc;
char *AdaptersName;
ULONG NameLength;
char *name;
char our_errbuf[PCAP_ERRBUF_SIZE+1];
/*
* Find out how big a buffer we need.
*
* This call should always return FALSE; if the error is
* ERROR_INSUFFICIENT_BUFFER, NameLength will be set to
* the size of the buffer we need, otherwise there's a
* problem, and NameLength should be set to 0.
*
* It shouldn't require NameLength to be set, but,
* at least as of WinPcap 4.1.3, it checks whether
* NameLength is big enough before it checks for a
* NULL buffer argument, so, while it'll still do
* the right thing if NameLength is uninitialized and
* whatever junk happens to be there is big enough
* (because the pointer argument will be null), it's
* still reading an uninitialized variable.
*/
NameLength = 0;
if (!PacketGetAdapterNames(NULL, &NameLength))
{
DWORD last_error = GetLastError();
if (last_error != ERROR_INSUFFICIENT_BUFFER)
{
pcap_win32_err_to_str(last_error, our_errbuf);
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"PacketGetAdapterNames: %s", our_errbuf);
return (-1);
}
}
if (NameLength > 0)
AdaptersName = (char*) malloc(NameLength);
else
{
*alldevsp = NULL;
return 0;
}
if (AdaptersName == NULL)
{
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters.");
return (-1);
}
if (!PacketGetAdapterNames(AdaptersName, &NameLength)) {
pcap_win32_err_to_str(GetLastError(), our_errbuf);
pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "PacketGetAdapterNames: %s",
our_errbuf);
free(AdaptersName);
return (-1);
}
/*
* "PacketGetAdapterNames()" returned a list of
* null-terminated ASCII interface name strings,
* terminated by a null string, followed by a list
* of null-terminated ASCII interface description
* strings, terminated by a null string.
* This means there are two ASCII nulls at the end
* of the first list.
*
* Find the end of the first list; that's the
* beginning of the second list.
*/
desc = &AdaptersName[0];
while (*desc != '\0' || *(desc + 1) != '\0')
desc++;
/*
* Found it - "desc" points to the first of the two
* nulls at the end of the list of names, so the
* first byte of the list of descriptions is two bytes
* after it.
*/
desc += 2;
/*
* Loop over the elements in the first list.
*/
name = &AdaptersName[0];
while (*name != '\0') {
bpf_u_int32 flags = 0;
#ifdef HAVE_PACKET_IS_LOOPBACK_ADAPTER
pcap_t p;
/*
* Is this a loopback interface?
* XXX - it'd be best if there were a way to get a list
* of interfaces *and* flags, including "Up" and "Running"
* as well as "loopback", without having to open the
* interfaces.
*/
p = pcap_open_live(name, 68, 0, 0, errbuf);
if (p != NULL) {
if (PacketIsLoopbackAdapter(p->adapter)) {
/* Yes */
flags |= PCAP_IF_LOOPBACK;
}
pcap_close(p);
}
#endif
/*
* Add an entry for this interface.
*/
if (pcap_add_if_win32(&devlist, name, flags, desc,
errbuf) == -1) {
/*
* Failure.
*/
ret = -1;
break;
}
name += strlen(name) + 1;
desc += strlen(desc) + 1;
}
if (ret == -1) {
/*
* We had an error; free the list we've been constructing.
*/
if (devlist != NULL) {
pcap_freealldevs(devlist);
devlist = NULL;
}
}
*alldevsp = devlist;
free(AdaptersName);
return (ret);
}