From 1476c281d2a310831b5bf1cf130f170891104a51 Mon Sep 17 00:00:00 2001 From: Christian Mehlis Date: Mon, 18 Aug 2014 13:36:18 +0200 Subject: [PATCH] dhcpv4: send NAK to broacast address --- src/dhcpv4.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/dhcpv4.c b/src/dhcpv4.c index 5883847..ebddb22 100644 --- a/src/dhcpv4.c +++ b/src/dhcpv4.c @@ -458,6 +458,13 @@ static void handle_dhcpv4(void *addr, void *data, size_t len, */ dest.sin_addr.s_addr = INADDR_BROADCAST; dest.sin_port = htons(DHCPV4_CLIENT_PORT); + } else if (!req->ciaddr.s_addr && msg == DHCPV4_MSG_NAK) { + /* + * client has no previous configuration -> no IP, so we need to reply + * with a broadcast packet + */ + dest.sin_addr.s_addr = INADDR_BROADCAST; + dest.sin_port = htons(DHCPV4_CLIENT_PORT); } else { /* * send reply to the newly (in this proccess) allocated IP -- 2.30.2