Fix dhclient to properly exit and teardown the configured lease when

link is lost.  devd will start a new dhclient instance when link is
restored.

PR:		bin/166656
Submitted by:	Peter Jeremy (mostly)
Reviewed by:	brooks (earlier version from Peter)
MFC after:	1 month

1 files changed, 7 insertions, 0 deletions

diff --git a/sbin/dhclient/dhclient.c b/sbin/dhclient/dhclient.c
index 4f2405a..7260d3f 100644
--- a/sbin/dhclient/dhclient.c
+++ b/sbin/dhclient/dhclient.c
@@ -278,6 +278,11 @@ routehandler(struct protocol *p)
 			    ifi->name);
 			goto die;
 		}
+		if (!interface_link_status(ifi->name)) {
+			warning("Interface %s is down, dhclient exiting",
+			    ifi->name);
+			goto die;
+		}
 		break;
 	case RTM_IFANNOUNCE:
 		ifan = (struct if_announcemsghdr *)rtm;
@@ -316,6 +321,8 @@ routehandler(struct protocol *p)
 
 die:
 	script_init("FAIL", NULL);
+	if (ifi->client->active)
+		script_write_params("old_", ifi->client->active);
 	if (ifi->client->alias)
 		script_write_params("alias_", ifi->client->alias);
 	script_go();