Implement RFC-4388 DHCPv4 leasequery.

src/option.c

@@ -195,6 +195,7 @@ struct myoption {
 #define LOPT_PXE_OPT       386
 #define LOPT_NO_ENCODE     387
 #define LOPT_DO_ENCODE     388
+#define LOPT_LEASEQUERY    389
 
 #ifdef HAVE_GETOPT_LONG
 static const struct option opts[] =  
@@ -394,6 +395,7 @@ static const struct myoption opts[] =
     { "use-stale-cache", 2, 0 , LOPT_STALE_CACHE },
     { "no-ident", 0, 0, LOPT_NO_IDENT },
     { "max-tcp-connections", 1, 0, LOPT_MAX_PROCS },
+    { "leasequery", 0, 0, LOPT_LEASEQUERY },
     { NULL, 0, 0, 0 }
   };
 
@@ -499,6 +501,7 @@ static struct {
   { '4', ARG_DUP, "set:<tag>,<mac address>", gettext_noop("Map MAC address (with wildcards) to option set."), NULL },
   { LOPT_BRIDGE, ARG_DUP, "<iface>,<alias>..", gettext_noop("Treat DHCP requests on aliases as arriving from interface."), NULL },
   { LOPT_SHARED_NET, ARG_DUP, "<iface>|<addr>,<addr>", gettext_noop("Specify extra networks sharing a broadcast domain for DHCP"), NULL},
+  { LOPT_LEASEQUERY, OPT_LEASEQUERY, NULL, gettext_noop("Enable RFC 4388 leasequery functions for DHCPv4"), NULL},
   { '5', OPT_NO_PING, NULL, gettext_noop("Disable ICMP echo address checking in the DHCP server."), NULL },
   { '6', ARG_ONE, "<path>", gettext_noop("Shell script to run on DHCP lease creation and destruction."), NULL },
   { LOPT_LUASCRIPT, ARG_DUP, "path", gettext_noop("Lua script to run on DHCP lease creation and destruction."), NULL },