3 files changed, 68 insertions, 5 deletions

diff --git a/sbin/dhclient/dhclient.c b/sbin/dhclient/dhclient.c
index fcd364d5794..e640643c415 100644
--- a/sbin/dhclient/dhclient.c
+++ b/sbin/dhclient/dhclient.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dhclient.c,v 1.86 2006/06/16 16:17:16 reyk Exp $	*/
+/*	$OpenBSD: dhclient.c,v 1.87 2006/08/29 03:55:08 deraadt Exp $	*/
 
 /*
  * Copyright 2004 Henning Brauer <henning@openbsd.org>
@@ -243,7 +243,7 @@ die:
 int
 main(int argc, char *argv[])
 {
-	int	 ch, fd, quiet = 0, i = 0, pipe_fd[2];
+	int	 ch, fd, quiet = 0, i = 0, pipe_fd[2], linkstat;
 	extern char *__progname;
 	struct passwd *pw;
 
@@ -309,10 +309,14 @@ main(int argc, char *argv[])
 
 	read_client_conf();
 
+	linkstat = interface_link_forceup(ifi->name);
+
 	if (!interface_link_status(ifi->name)) {
 		fprintf(stderr, "%s: no link ...", ifi->name);
 		if (ifi->client->config->link_timeout == 0) {
 			fprintf(stderr, " giving up\n");
+			if (linkstat == 0)
+				interface_link_forcedown(ifi->name);
 			exit(1);
 		}
 		fflush(stderr);
@@ -322,6 +326,8 @@ main(int argc, char *argv[])
 			fflush(stderr);
 			if (++i > ifi->client->config->link_timeout) {
 				fprintf(stderr, " giving up\n");
+				if (linkstat == 0)
+					interface_link_forcedown(ifi->name);
 				exit(1);
 			}
 			sleep(1);
diff --git a/sbin/dhclient/dhcpd.h b/sbin/dhclient/dhcpd.h
index b0e07aa4f93..a5e18f1250c 100644
--- a/sbin/dhclient/dhcpd.h
+++ b/sbin/dhclient/dhcpd.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dhcpd.h,v 1.48 2006/05/08 17:25:59 deraadt Exp $	*/
+/*	$OpenBSD: dhcpd.h,v 1.49 2006/08/29 03:55:09 deraadt Exp $	*/
 
 /*
  * Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
@@ -286,6 +286,8 @@ void cancel_timeout(void (*)(void *), void *);
 void add_protocol(char *, int, void (*)(struct protocol *), void *);
 void remove_protocol(struct protocol *);
 int interface_link_status(char *);
+int interface_link_forceup(char *);
+void interface_link_forcedown(char *);
 
 /* tables.c */
 extern const struct option dhcp_options[256];
diff --git a/sbin/dhclient/dispatch.c b/sbin/dhclient/dispatch.c
index 5b4f350eb45..5ce380f61cb 100644
--- a/sbin/dhclient/dispatch.c
+++ b/sbin/dhclient/dispatch.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dispatch.c,v 1.32 2005/05/24 03:11:12 todd Exp $	*/
+/*	$OpenBSD: dispatch.c,v 1.33 2006/08/29 03:55:09 deraadt Exp $	*/
 
 /*
  * Copyright 2004 Henning Brauer <henning@openbsd.org>
@@ -220,7 +220,6 @@ another:
 	} while (1);
 }
 
-
 void
 got_one(struct protocol *l)
 {
@@ -269,6 +268,62 @@ got_one(struct protocol *l)
 }
 
 int
+interface_link_forceup(char *ifname)
+{
+	struct ifreq ifr;
+	int sock, ret = 0;
+
+	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
+		error("Can't create socket");
+
+	memset(&ifr, 0, sizeof(ifr));
+	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(sock, SIOCGIFFLAGS, (caddr_t)&ifr) == -1) {
+		close(sock);
+		return (-1);
+	}
+
+	if ((ifr.ifr_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) {
+		ifr.ifr_flags |= IFF_UP;
+		if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
+			close(sock);
+			return (-1);
+		}
+		close(sock);
+		return (0);
+	}
+	close(sock);
+	return (1);
+}
+
+void
+interface_link_forcedown(char *ifname)
+{
+	struct ifreq ifr;
+	int sock;
+
+	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
+		error("Can't create socket");
+
+	memset(&ifr, 0, sizeof(ifr));
+	strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+	if (ioctl(sock, SIOCGIFFLAGS, (caddr_t)&ifr) == -1) {
+		close(sock);
+		return;
+	}
+
+	if ((ifr.ifr_flags & IFF_UP) == IFF_UP) {
+		ifr.ifr_flags &= ~IFF_UP;
+		if (ioctl(sock, SIOCSIFFLAGS, (caddr_t)&ifr) == -1) {
+			close(sock);
+			return;
+		}
+	}
+
+	close(sock);
+}
+
+int
 interface_status(struct interface_info *ifinfo)
 {
 	char *ifname = ifinfo->name;