diff options
Diffstat (limited to 'src/dhcpv4.c')
| -rw-r--r-- | src/dhcpv4.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/dhcpv4.c b/src/dhcpv4.c index 9b9b528..5883847 100644 --- a/src/dhcpv4.c +++ b/src/dhcpv4.c @@ -439,16 +439,29 @@ static void handle_dhcpv4(void *addr, void *data, size_t len, struct sockaddr_in dest = *((struct sockaddr_in*)addr); if (req->giaddr.s_addr) { + /* + * relay agent is configured, send reply to the agent + */ dest.sin_addr = req->giaddr; dest.sin_port = htons(DHCPV4_SERVER_PORT); } else if (req->ciaddr.s_addr && req->ciaddr.s_addr != dest.sin_addr.s_addr) { + /* + * client has existing configuration (ciaddr is set) AND this address is + * not the address it used for the dhcp message + */ dest.sin_addr = req->ciaddr; dest.sin_port = htons(DHCPV4_CLIENT_PORT); } else if ((ntohs(req->flags) & DHCPV4_FLAG_BROADCAST) || req->hlen != reply.hlen || !reply.yiaddr.s_addr) { + /* + * client requests a broadcast reply OR we can't offer an IP + */ 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 + */ dest.sin_addr = reply.yiaddr; dest.sin_port = htons(DHCPV4_CLIENT_PORT); |