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-rw-r--r--contrib/check_dhcp.c8
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
515/* creates a socket for DHCP communication */ 515/* creates a socket for DHCP communication */
516int create_dhcp_socket(void){ 516int create_dhcp_socket(void){
517 struct sockaddr_in myname; 517 struct sockaddr_in myname;
518 struct ifreq interface;
518 int sock; 519 int sock;
519 int flag=1; 520 int flag=1;
520 521
@@ -549,6 +550,13 @@ int create_dhcp_socket(void){
549 exit(STATE_UNKNOWN); 550 exit(STATE_UNKNOWN);
550 } 551 }
551 552
553 /* bind socket to interface */
554 strncpy(interface.ifr_ifrn.ifrn_name,network_interface_name,IFNAMSIZ);
555 if(setsockopt(sock,SOL_SOCKET,SO_BINDTODEVICE,(char *)&interface,sizeof(interface))<0){
556 printf("Error: Could not bind socket to interface %s. Check your privileges...\n",network_interface_name);
557 exit(STATE_UNKNOWN);
558 }
559
552 /* bind the socket */ 560 /* bind the socket */
553 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){ 561 if(bind(sock,(struct sockaddr *)&myname,sizeof(myname))<0){
554 printf("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n",DHCP_CLIENT_PORT); 562 printf("Error: Could not bind to DHCP socket (port %d)! Check your privileges...\n",DHCP_CLIENT_PORT);