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Fix dnet raw packet sending on Npcap Loopback on Windows in NSE

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dmiller
2017-03-05 04:10:46 +00:00
parent 0b93e8da2e
commit 36301d6ddd
1 changed files with 15 additions and 5 deletions
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20
nse_dnet.cc
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@@ -277,16 +277,26 @@ static int ip_send (lua_State *L)
else
nexthop = &route.nexthop;
if (!getNextHopMAC(route.ii.devfullname, route.ii.mac, &hdr.src, nexthop, dstmac))
return luaL_error(L, "failed to determine next hop MAC address");
/* Use cached ethernet device, and use udata's eth and interface to keep
* track of if we're reusing the same device from the previous packet, and
* close the cached device if not.
*/
memset(&eth, 0, sizeof(eth));
memcpy(eth.srcmac, route.ii.mac, sizeof(eth.srcmac));
memcpy(eth.dstmac, dstmac, sizeof(eth.dstmac));
#ifdef WIN32
// Only determine mac addr info if it's not the Npcap Loopback Adapter.
// Npcap loopback doesn't have a MAC address and isn't an ethernet device,
// so getNextHopMAC crashes.
if (!(g_has_npcap_loopback && route.ii.device_type == devt_loopback)) {
#endif
if (!getNextHopMAC(route.ii.devfullname, route.ii.mac, &hdr.src, nexthop, dstmac))
return luaL_error(L, "failed to determine next hop MAC address");
memcpy(eth.srcmac, route.ii.mac, sizeof(eth.srcmac));
memcpy(eth.dstmac, dstmac, sizeof(eth.dstmac));
#ifdef WIN32
} // end if not Npcap loopback
#endif
/* close any current ethernet associated with this userdata */
lua_getfield(L, 1, "ethernet_close");