From 89ee0bfdcdc7c119bc08f5b434d3d99556b56bcd Mon Sep 17 00:00:00 2001
From: Matthew Dillon <dillon@dragonflybsd.org>
Date: Sat, 16 Jun 2007 19:59:30 +0000
Subject: [PATCH] Implement an opaque function, if_getanyethermac(), which
 retrieves MAC information from the first real hardware interface for use by
 the uuidgen code.

---
 sys/net/if.c     | 27 ++++++++++++++++++++++++++-
 sys/net/if_var.h |  3 ++-
 2 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/sys/net/if.c b/sys/net/if.c
index 874896271b..a5d04fb4ad 100644
--- a/sys/net/if.c
+++ b/sys/net/if.c
@@ -32,7 +32,7 @@
  *
  *	@(#)if.c	8.3 (Berkeley) 1/4/94
  * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
- * $DragonFly: src/sys/net/if.c,v 1.51 2007/05/13 18:33:58 swildner Exp $
+ * $DragonFly: src/sys/net/if.c,v 1.52 2007/06/16 19:59:30 dillon Exp $
  */
 
 #include "opt_compat.h"
@@ -1854,6 +1854,31 @@ ifmaof_ifpforaddr(struct sockaddr *sa, struct ifnet *ifp)
 }
 
 /*
+ * This function locates the first real ethernet MAC from a network
+ * card and loads it into node, returning 0 on success or ENOENT if
+ * no suitable interfaces were found.  It is used by the uuid code to
+ * generate a unique 6-byte number.
+ */
+int
+if_getanyethermac(uint16_t *node, int minlen)
+{
+	struct ifnet *ifp;
+	struct sockaddr_dl *sdl;
+
+	TAILQ_FOREACH(ifp, &ifnet, if_link) {
+		if (ifp->if_type != IFT_ETHER)
+			continue;
+		sdl = IF_LLSOCKADDR(ifp);
+		if (sdl->sdl_alen < minlen)
+			continue;
+		bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr, node,
+		      minlen);
+		return(0);
+	}
+	return (ENOENT);
+}
+
+/*
  * The name argument must be a pointer to storage which will last as
  * long as the interface does.  For physical devices, the result of
  * device_get_name(dev) is a good choice and for pseudo-devices a
diff --git a/sys/net/if_var.h b/sys/net/if_var.h
index 8dc1e40d5d..821c5b1071 100644
--- a/sys/net/if_var.h
+++ b/sys/net/if_var.h
@@ -32,7 +32,7 @@
  *
  *	From: @(#)if.h	8.1 (Berkeley) 6/10/93
  * $FreeBSD: src/sys/net/if_var.h,v 1.18.2.16 2003/04/15 18:11:19 fjoe Exp $
- * $DragonFly: src/sys/net/if_var.h,v 1.37 2007/03/24 05:57:49 sephe Exp $
+ * $DragonFly: src/sys/net/if_var.h,v 1.38 2007/06/16 19:59:30 dillon Exp $
  */
 
 #ifndef	_NET_IF_VAR_H_
@@ -465,6 +465,7 @@ void	if_detach(struct ifnet *);
 void	if_down(struct ifnet *);
 void	if_link_state_change(struct ifnet *);
 void	if_initname(struct ifnet *, const char *, int);
+int	if_getanyethermac(uint16_t *, int);
 int	if_printf(struct ifnet *, const char *, ...) __printflike(2, 3);
 void	if_route(struct ifnet *, int flag, int fam);
 int	if_setlladdr(struct ifnet *, const u_char *, int);
-- 
2.11.4.GIT