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libpcap/pcap-win32.c

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/*
* Copyright (c) 1999, 2000
* Politecnico di Torino. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that: (1) source code distributions
* retain the above copyright notice and this paragraph in its entirety, (2)
* distributions including binary code include the above copyright notice and
* this paragraph in its entirety in the documentation or other materials
* provided with the distribution, and (3) all advertising materials mentioning
* features or use of this software display the following acknowledgement:
* ``This product includes software developed by the Politecnico
* di Torino, and its contributors.'' Neither the name of
* the University 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <pcap-int.h>
#include <packet32.h>
#include <Ntddndis.h>
#ifdef __MINGW32__
int* _errno();
#define errno (*_errno())
#endif /* __MINGW32__ */
#define PcapBufSize 256000 /*dimension of the buffer in the pcap_t structure*/
#define SIZE_BUF 1000000
/*start winsock*/
int
wsockinit()
{
WORD wVersionRequested;
WSADATA wsaData;
int err;
wVersionRequested = MAKEWORD( 1, 1);
err = WSAStartup( wVersionRequested, &wsaData );
if ( err != 0 )
{
return -1;
}
return 0;
}
int
pcap_stats(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;
}
int
pcap_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user)
{
int cc;
int n = 0;
register u_char *bp, *ep;
cc = p->cc;
if (p->cc == 0) {
/* capture the packets */
if(PacketReceivePacket(p->adapter,p->Packet,TRUE)==FALSE){
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "read error: PacketReceivePacket failed");
return (-1);
}
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 (bp < ep) {
register int caplen, hdrlen;
caplen = bhp->bh_caplen;
hdrlen = bhp->bh_hdrlen;
/*
* XXX A bpf_hdr matches a pcap_pkthdr.
*/
(*callback)(user, (struct pcap_pkthdr*)bp, bp + hdrlen);
bp += BPF_WORDALIGN(caplen + hdrlen);
if (++n >= cnt && cnt > 0) {
p->bp = bp;
p->cc = ep - bp;
return (n);
}
}
#undef bhp
p->cc = 0;
return (n);
}
pcap_t *
pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf)
{
register pcap_t *p;
NetType type;
/* Init WinSock */
wsockinit();
p = (pcap_t *)malloc(sizeof(*p));
if (p == NULL) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
return (NULL);
}
memset(p, 0, sizeof(*p));
p->adapter=NULL;
p->adapter=PacketOpenAdapter(device);
if (p->adapter==NULL) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "Error opening adapter: %s", pcap_win32strerror());
return NULL;
}
/*get network type*/
if(PacketGetNetType (p->adapter,&type)==FALSE)
{
snprintf(ebuf, 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;
break;
case NdisMediumFddi:
p->linktype = DLT_FDDI;
break;
case NdisMedium802_5:
p->linktype = DLT_IEEE802;
break;
case NdisMediumArcnet878_2:
p->linktype = DLT_ARCNET;
break;
case NdisMediumAtm:
p->linktype = DLT_ATM_RFC1483;
break;
default:
p->linktype = DLT_EN10MB; /*an unknown adapter is assumed to be ethernet*/
}
/* Set promisquous mode */
if (promisc) PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_PROMISCUOUS);
else PacketSetHwFilter(p->adapter,NDIS_PACKET_TYPE_ALL_LOCAL);
/* Set the buffer size */
p->bufsize = PcapBufSize;
p->buffer = (u_char *)malloc(PcapBufSize);
if (p->buffer == NULL) {
snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno));
goto bad;
}
p->snapshot = snaplen;
/* allocate Packet structure used during the capture */
if((p->Packet = PacketAllocatePacket())==NULL){
snprintf(ebuf, PCAP_ERRBUF_SIZE, "failed to allocate the PACKET structure");
goto bad;
}
PacketInitPacket(p->Packet,(BYTE*)p->buffer,p->bufsize);
/* allocate the standard buffer in the driver */
if(PacketSetBuff( p->adapter, SIZE_BUF)==FALSE)
{
snprintf(ebuf, PCAP_ERRBUF_SIZE,"driver error: not enough memory to allocate the kernel buffer\n");
goto bad;
}
/* tell the driver to copy the buffer only if it contains at least 16K */
if(PacketSetMinToCopy(p->adapter,16000)==FALSE)
{
snprintf(ebuf, PCAP_ERRBUF_SIZE,"Error calling PacketSetMinToCopy: %s\n", pcap_win32strerror());
goto bad;
}
PacketSetReadTimeout(p->adapter, to_ms);
return (p);
bad:
if (p->adapter)
PacketCloseAdapter(p->adapter);
if (p->buffer != NULL)
free(p->buffer);
free(p);
return (NULL);
}
int
pcap_setfilter(pcap_t *p, struct bpf_program *fp)
{
if(p->adapter==NULL){
/* Offline capture: make our own copy of the filter */
if (install_bpf_program(p, fp) < 0)
return (-1);
}
else if(PacketSetBpf(p->adapter,fp)==FALSE){
/* kernel filter not installed. */
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Driver error: cannot set bpf filter: %s", pcap_win32strerror());
return (-1);
}
return (0);
}
/* Set the driver working mode */
int
pcap_setmode(pcap_t *p, int mode){
if (p->adapter==NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "impossible to set mode while reading from a file");
return -1;
}
if(PacketSetMode(p->adapter,mode)==FALSE)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "driver error: working mode not recognized");
return -1;
}
return 0;
}
/* Send a packet to the network */
int
pcap_sendpacket(pcap_t *p, u_char *buf, int size){
LPPACKET PacketToSend;
if (p->adapter==NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Writing a packet is allowed only on a physical adapter");
return -1;
}
PacketToSend=PacketAllocatePacket();
PacketInitPacket(PacketToSend,buf,size);
if(PacketSendPacket(p->adapter,PacketToSend,TRUE) == FALSE){
PacketFreePacket(PacketToSend);
return -1;
}
PacketFreePacket(PacketToSend);
return 0;
}
/* Set the dimension of the kernel-level capture buffer */
int
pcap_setbuff(pcap_t *p, int dim)
{
if (p->adapter==NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "The kernel buffer size cannot be set while reading from a file");
return -1;
}
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 minimum amount of data that will release a read call*/
int
pcap_setmintocopy(pcap_t *p, int size)
{
if (p->adapter==NULL)
{
snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "Impossible to set the mintocopy parameter on an offline capture");
return -1;
}
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;
}