# etherspoof-2.7.diff -- kernel patch to spoof your source mac address# OpenBSD 2.7 [diff version] by obecian <obecian@subterrain.net>## based on earlier versions by:# Copyright (c) 1999, 2000 Trevor Scheroeder <tschroed@zweknu.org># Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike@infonexus.com># Original code and idea 1997 Thomas Ptacek <tqbf@pobox.com## to patch kernel simply (as root):# cd /usr/src/sys/net# patch -p0 < etherspoof-2.7.diff# recompile kernel#--- if_ethersubr.c.orig	Sun May  7 11:39:34 2000+++ if_ethersubr.c	Sun May  7 11:44:33 2000@@ -242,7 +242,7 @@ ether_output(ifp, m0, dst, rt0) { 	u_int16_t etype; 	int s, error = 0;- 	u_char edst[6];+ 	u_char edst[6], esrc[6]; 	register struct mbuf *m = m0; 	register struct rtentry *rt; 	struct mbuf *mcopy = (struct mbuf *)0;@@ -284,6 +284,7 @@ ether_output(ifp, m0, dst, rt0) 		if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX)) 			mcopy = m_copy(m, 0, (int)M_COPYALL); 		etype = htons(ETHERTYPE_IP);+		bcopy(ac->ac_enaddr, esrc, sizeof (edst)); 		break; #endif #ifdef INET6@@ -453,7 +454,7 @@ ether_output(ifp, m0, dst, rt0) 			if (mcopy) { 				eh = mtod(mcopy, struct ether_header *); 				bcopy(edst, eh->ether_dhost, sizeof (edst));-				bcopy(ac->ac_enaddr, eh->ether_shost,+				bcopy(esrc, eh->ether_shost, 				    sizeof (edst)); 			} 		}@@ -477,6 +478,7 @@ ether_output(ifp, m0, dst, rt0) 	case AF_UNSPEC: 		eh = (struct ether_header *)dst->sa_data;  		bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));+		bcopy((caddr_t)eh->ether_shost, (caddr_t)esrc, sizeof (edst)); 		/* AF_UNSPEC doesn't swap the byte order of the ether_type. */ 		etype = eh->ether_type; 		break;@@ -501,7 +503,7 @@ ether_output(ifp, m0, dst, rt0) 	bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type, 		sizeof(eh->ether_type));  	bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));- 	bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost,+ 	bcopy((caddr_t)esrc, (caddr_t)eh->ether_shost, 	    sizeof(eh->ether_shost));  #if NBRIDGE > 0