1 files changed, 8 insertions, 0 deletions

diff --git a/contrib/check_dhcp.c b/contrib/check_dhcp.c
index 24b82f9..2aea579 100644
--- a/contrib/check_dhcp.c
+++ b/contrib/check_dhcp.c
@@ -515,6 +515,7 @@ int receive_dhcp_packet(void *buffer, int buffer_size, int sock, int timeout, st
 /* creates a socket for DHCP communication */
 int create_dhcp_socket(void){
         struct sockaddr_in myname;
+        struct ifreq interface;
         int sock;
         int flag=1;
 
@@ -549,6 +550,13 @@ int create_dhcp_socket(void){
                 exit(STATE_UNKNOWN);
                 }
 
+        /* bind socket to interface */
+        strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
+        if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
+                printf("Error: Could not bind socket to interface %s.  Check your privileges...\n",network_interface_name);
+                exit(STATE_UNKNOWN);
+                }
+
         /* bind the socket */
         if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
                 printf("Error: Could not bind to DHCP socket (port %d)!  Check your privileges...\n",DHCP_CLIENT_PORT);