Make it possible to compile-out the local interface.

Run make EXTRA_DEFINES=-DNO_LOCAL_INTERFACE.

babel.c

@@ -200,9 +200,11 @@ main(int argc, char **argv)
         } else if(strcmp(*arg, "-d") == 0) {
             SHIFTE();
             debug = atoi(*arg);
+#ifndef NO_LOCAL_INTERFACE
         } else if(strcmp(*arg, "-g") == 0) {
             SHIFTE();
             local_server_port = atoi(*arg);
+#endif
         } else if(strcmp(*arg, "-l") == 0) {
             link_detect = 1;
         } else if(strcmp(*arg, "-w") == 0) {
@@ -509,6 +511,7 @@ main(int argc, char **argv)
         SHIFT();
     }
 
+#ifndef NO_LOCAL_INTERFACE
     if(local_server_port >= 0) {
         local_server_socket = tcp_server_socket(local_server_port, 1);
         if(local_server_socket < 0) {
@@ -516,6 +519,7 @@ main(int argc, char **argv)
             goto fail;
         }
     }
+#endif
 
     init_signals();
     resize_receive_buffer(1500);
@@ -584,6 +588,7 @@ main(int argc, char **argv)
                 FD_SET(kernel_socket, &readfds);
                 maxfd = MAX(maxfd, kernel_socket);
             }
+#ifndef NO_LOCAL_INTERFACE
             if(local_socket >= 0) {
                 FD_SET(local_socket, &readfds);
                 maxfd = MAX(maxfd, local_socket);
@@ -591,6 +596,7 @@ main(int argc, char **argv)
                 FD_SET(local_server_socket, &readfds);
                 maxfd = MAX(maxfd, local_server_socket);
             }
+#endif
             rc = select(maxfd + 1, &readfds, NULL, NULL, &tv);
             if(rc < 0) {
                 if(errno != EINTR) {
@@ -634,6 +640,7 @@ main(int argc, char **argv)
             }
         }
 
+#ifndef NO_LOCAL_INTERFACE
         if(local_server_socket >= 0 &&
            FD_ISSET(local_server_socket, &readfds)) {
             if(local_socket >= 0) {
@@ -658,6 +665,7 @@ main(int argc, char **argv)
                 local_socket = -1;
             }
         }
+#endif
 
         if(changed) {
             kernel_dump_time = now.tv_sec;

local.c

@@ -35,6 +35,12 @@ THE SOFTWARE.
 #include "util.h"
 #include "local.h"
 
+#ifdef NO_LOCAL_INTERFACE
+
+int dummy;
+
+#else
+
 int
 local_read(int s)
 {
@@ -247,3 +253,5 @@ local_dump()
     shutdown(local_socket, 1);
     return;
 }
+
+#endif

local.h

@@ -28,9 +28,20 @@ struct xroute;
 #define LOCAL_ADD 1
 #define LOCAL_CHANGE 2
 
+#ifndef NO_LOCAL_INTERFACE
+
 int local_read(int s);
 void local_notify_self(void);
 void local_notify_neighbour(struct neighbour *neigh, int kind);
 void local_notify_xroute(struct xroute *xroute, int kind);
 void local_notify_route(struct route *route, int kind);
 void local_dump(void);
+
+#else
+
+#define local_notify_self() do {} while(0)
+#define local_notify_neighbour(n, k) do {} while(0)
+#define local_notify_xroute(x, k) do {} while(0)
+#define local_notify_route(r, k) do {} while(0)
+#define local_dump() do {} while 0
+#endif