[pxe] Fall back to broadcast if no boot server multicast address exists

fetch_ipv4_setting() will zero its IPv4 address argument if no such
setting exists, rather than leaving it untouched.

diff --git a/src/usr/pxemenu.c b/src/usr/pxemenu.c
index 3f5bfc8..ae97108 100644 (file)
--- a/src/usr/pxemenu.c
+++ b/src/usr/pxemenu.c
@@ -95,8 +95,9 @@ static int pxe_menu_parse ( struct pxe_menu **menu ) {
 
        /* Fetch relevant settings */
        tmp_setting.tag = DHCP_PXE_BOOT_SERVER_MCAST;
-       server.s_addr = INADDR_BROADCAST;
        fetch_ipv4_setting ( NULL, &tmp_setting, &server );
+       if ( ! server.s_addr )
+               server.s_addr = INADDR_BROADCAST;
        tmp_setting.tag = DHCP_PXE_BOOT_MENU_PROMPT;
        fetch_setting ( NULL, &tmp_setting, &prompt, sizeof ( prompt ) );
        tmp_setting.tag = DHCP_PXE_BOOT_MENU;