From: Tom Gundersen <teg@jklm.no>
Date: Sat, 21 Jun 2014 12:39:36 +0000 (+0200)
Subject: sd-dhcp-server: fix broadcast of DHCP packets
X-Git-Tag: v215~238
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=d6bd972d061af306ede2affd2c9340a1660f7996

sd-dhcp-server: fix broadcast of DHCP packets

The destination IP address should be INADDR_BROADCAST, but was
accidentally left as INADDR_ANY.
---

diff --git a/src/libsystemd-network/dhcp-network.c b/src/libsystemd-network/dhcp-network.c
index d7ba0efa1..0e37bea19 100644
--- a/src/libsystemd-network/dhcp-network.c
+++ b/src/libsystemd-network/dhcp-network.c
@@ -127,6 +127,10 @@ int dhcp_network_bind_udp_socket(be32_t address, uint16_t port) {
                 r = setsockopt(s, IPPROTO_IP, IP_PKTINFO, &on, sizeof(on));
                 if (r < 0)
                         return -errno;
+
+                r = setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on));
+                if (r < 0)
+                        return -errno;
         }
 
         r = bind(s, &src.sa, sizeof(src.in));
diff --git a/src/libsystemd-network/sd-dhcp-server.c b/src/libsystemd-network/sd-dhcp-server.c
index e4236e8f7..55a8fbe00 100644
--- a/src/libsystemd-network/sd-dhcp-server.c
+++ b/src/libsystemd-network/sd-dhcp-server.c
@@ -340,9 +340,12 @@ int dhcp_server_send_packet(sd_dhcp_server *server,
         } else if (req->message->ciaddr && type != DHCP_NAK)
                 destination = req->message->ciaddr;
 
-        if (destination || requested_broadcast(req) || type == DHCP_NAK)
+        if (destination != INADDR_ANY)
                 return dhcp_server_send_udp(server, destination, &packet->dhcp,
                                             sizeof(DHCPMessage) + optoffset);
+        else if (requested_broadcast(req) || type == DHCP_NAK)
+                return dhcp_server_send_udp(server, INADDR_BROADCAST, &packet->dhcp,
+                                            sizeof(DHCPMessage) + optoffset);
         else
                 /* we cannot send UDP packet to specific MAC address when the address is
                    not yet configured, so must fall back to raw packets */