config: add option to indicate dns service presence

[project/odhcpd.git] / src / dhcpv4.c

diff --git a/src/dhcpv4.c b/src/dhcpv4.c
index 25a4c773b09cd981fcd0b296463eb9c76bb0cb66..c3d16f56bb6262022c9f4984a4481bbb0e9e5af2 100644 (file)
--- a/src/dhcpv4.c
+++ b/src/dhcpv4.c
@@ -842,9 +842,10 @@ void dhcpv4_handle_msg(void *addr, void *data, size_t len,
                                4 * iface->dhcpv4_router_cnt, iface->dhcpv4_router);
 
 
-       if (iface->dhcpv4_dns_cnt == 0)
-               dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER, 4, &iface->dhcpv4_local);
-       else
+       if (iface->dhcpv4_dns_cnt == 0) {
+               if (iface->dns_service)
+                       dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER, 4, &iface->dhcpv4_local);
+       } else
                dhcpv4_put(&reply, &cookie, DHCPV4_OPT_DNSSERVER,
                                4 * iface->dhcpv4_dns_cnt, iface->dhcpv4_dns);