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/*
* eth-win32.c
*
* Copyright (c) 2000 Dug Song <dugsong@monkey.org>
*
* $Id: eth-win32.c 613 2005-09-26 02:46:57Z dugsong $
*/
#ifdef _WIN32
#include "dnet_winconfig.h"
#else
#include "config.h"
#endif
/* XXX - VC++ 6.0 bogosity */
#define sockaddr_storage sockaddr
#undef sockaddr_storage
#include <errno.h>
#include <stdlib.h>
#include "dnet.h"
#include <winsock2.h>
#include "pcap.h"
#include <Packet32.h>
#include <Ntddndis.h>
/* From Npcap's Loopback.h */
/*
* * Structure of a DLT_NULL header.
* */
typedef struct _DLT_NULL_HEADER
{
UINT null_type;
} DLT_NULL_HEADER, *PDLT_NULL_HEADER;
/*
* * The length of the combined header.
* */
#define DLT_NULL_HDR_LEN sizeof(DLT_NULL_HEADER)
/*
* * Types in a DLT_NULL (Loopback) header.
* */
#define DLTNULLTYPE_IP 0x00000002 /* IP protocol */
#define DLTNULLTYPE_IPV6 0x00000018 /* IPv6 */
/* END Loopback.h */
struct eth_handle {
LPADAPTER lpa;
LPPACKET pkt;
NetType type;
};
eth_t *
eth_open(const char *device)
{
eth_t *eth;
char pcapdev[128];
if (eth_get_pcap_devname(device, pcapdev, sizeof(pcapdev)) != 0)
return (NULL);
if ((eth = calloc(1, sizeof(*eth))) == NULL)
return (NULL);
eth->lpa = PacketOpenAdapter(pcapdev);
if (eth->lpa == NULL) {
eth_close(eth);
return (NULL);
}
PacketSetBuff(eth->lpa, 512000);
eth->pkt = PacketAllocatePacket();
if (eth->pkt == NULL) {
eth_close(eth);
return NULL;
}
if (!PacketGetNetType(eth->lpa, ð->type)) {
eth_close(eth);
return NULL;
}
return (eth);
}
ssize_t
eth_send(eth_t *eth, const void *buf, size_t len)
{
/* 14-byte Ethernet header, but DLT_NULL is a 4-byte header. Skip over the difference */
DLT_NULL_HEADER *hdr = (DLT_NULL_HEADER *)((uint8_t *)buf + ETH_HDR_LEN - DLT_NULL_HDR_LEN);
if (eth->type.LinkType == NdisMediumNull) {
switch (ntohs(((struct eth_hdr *)buf)->eth_type)) {
case ETH_TYPE_IP:
hdr->null_type = DLTNULLTYPE_IP;
break;
case ETH_TYPE_IPV6:
hdr->null_type = DLTNULLTYPE_IPV6;
break;
default:
hdr->null_type = 0;
break;
}
PacketInitPacket(eth->pkt, (void *)((uint8_t *)buf + ETH_HDR_LEN - DLT_NULL_HDR_LEN), (UINT) (len - ETH_HDR_LEN + DLT_NULL_HDR_LEN));
PacketSendPacket(eth->lpa, eth->pkt, TRUE);
}
else {
PacketInitPacket(eth->pkt, (void *)buf, (UINT) len);
PacketSendPacket(eth->lpa, eth->pkt, TRUE);
}
return (ssize_t)(len);
}
eth_t *
eth_close(eth_t *eth)
{
if (eth != NULL) {
if (eth->pkt != NULL)
PacketFreePacket(eth->pkt);
if (eth->lpa != NULL)
PacketCloseAdapter(eth->lpa);
free(eth);
}
return (NULL);
}
int
eth_get(eth_t *eth, eth_addr_t *ea)
{
PACKET_OID_DATA *data;
u_char buf[512];
data = (PACKET_OID_DATA *)buf;
data->Oid = OID_802_3_CURRENT_ADDRESS;
data->Length = ETH_ADDR_LEN;
if (PacketRequest(eth->lpa, FALSE, data) == TRUE) {
memcpy(ea, data->Data, ETH_ADDR_LEN);
return (0);
}
return (-1);
}
int
eth_set(eth_t *eth, const eth_addr_t *ea)
{
PACKET_OID_DATA *data;
u_char buf[512];
data = (PACKET_OID_DATA *)buf;
data->Oid = OID_802_3_CURRENT_ADDRESS;
memcpy(data->Data, ea, ETH_ADDR_LEN);
data->Length = ETH_ADDR_LEN;
if (PacketRequest(eth->lpa, TRUE, data) == TRUE)
return (0);
return (-1);
}
int
eth_get_pcap_devname(const char *intf_name, char *pcapdev, int pcapdevlen)
{
return intf_get_pcap_devname(intf_name, pcapdev, pcapdevlen);
}
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