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Permit sending on DLT_NULL devices on Windows

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This commit is contained in:
dmiller
2016-08-14 12:29:50 +00:00
parent b0fb9b5cdb
commit d5f7d5c45b
1 changed files with 47 additions and 2 deletions
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49
libdnet-stripped/src/eth-win32.c
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@@ -25,9 +25,31 @@
#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 *
@@ -60,6 +82,10 @@ eth_open(const char *device)
eth_close(eth);
return NULL;
}
if (!PacketGetNetType(eth->lpa, &eth->type)) {
eth_close(eth);
return NULL;
}
return (eth);
}
@@ -67,8 +93,27 @@ eth_open(const char *device)
ssize_t
eth_send(eth_t *eth, const void *buf, size_t len)
{
PacketInitPacket(eth->pkt, (void *)buf, (UINT) len);
PacketSendPacket(eth->lpa, eth->pkt, TRUE);
/* 14-byte Ethernet header, but DLT_NULL is a 4-byte header. Skip over the difference */
DLT_NULL_HEADER *hdr = (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);
}