Remove "parasitic" mode.

This is the functionality described in Appendix C of RFC 6126.  Its
main purpose is to avoid keeping a full source table, which makes it
possible to implement a subset of Babel in just a few hundred lines of
code.  However, the code for maintaining the source table is already
there, and a parasitic implementation can be simulated using filtering
-- so it makes little sense to keep the functionality.

babeld.c

@@ -167,9 +167,6 @@ main(int argc, char **argv)
             if(allow_duplicates < 0 || allow_duplicates > 0xFFFF)
                 goto usage;
             break;
-        case 'P':
-            parasitic = 1;
-            break;
         case 's':
             split_horizon = 0;
             break;
@@ -273,12 +270,6 @@ main(int argc, char **argv)
     resend_delay = MIN(resend_delay, default_wired_hello_interval / 2);
     resend_delay = MAX(resend_delay, 20);
 
-    if(parasitic && allow_duplicates >= 0) {
-        /* Too difficult to get right. */
-        fprintf(stderr, "Sorry, -P and -A are incompatible.\n");
-        exit(1);
-    }
-
     if(do_daemonise) {
         if(logfile == NULL)
             logfile = "/var/log/babeld.log";
@@ -780,7 +771,7 @@ main(int argc, char **argv)
             "                "
             "[-h hello] [-H wired_hello] [-z kind[,factor]]\n"
             "                "
-            "[-k metric] [-A metric] [-s] [-P] [-l] [-w] [-u] [-g port]\n"
+            "[-k metric] [-A metric] [-s] [-l] [-w] [-u] [-g port]\n"
             "                "
             "[-t table] [-T table] [-c file] [-C statement]\n"
             "                "

babeld.man

@@ -88,10 +88,6 @@ Do not flush unfeasible (useless) routes.  This is useful in order to
 announce more information to a front-end (see
 .BR \-g ).
 .TP
-.B \-P
-Run in parasitic (passive) mode.  The daemon will only announce
-redistributed routes.
-.TP
 .BI \-d " level"
 Debug level.  A value of 1 requests a routing table dump at every
 iteration through the daemon's main loop.  A value of 2 additionally

message.c

@@ -43,7 +43,6 @@ THE SOFTWARE.
 
 unsigned char packet_header[4] = {42, 2};
 
-int parasitic = 0;
 int split_horizon = 1;
 
 unsigned short myseqno = 0;
@@ -1120,17 +1119,13 @@ send_update(struct interface *ifp, int urgent,
         return;
 
     if(prefix) {
-        if(!parasitic || find_xroute(prefix, plen)) {
         debugf("Sending update to %s for %s.\n",
                ifp->name, format_prefix(prefix, plen));
         buffer_update(ifp, prefix, plen);
-        }
     } else {
         send_self_update(ifp);
-        if(!parasitic) {
         debugf("Sending update to %s for any.\n", ifp->name);
         for_all_installed_routes(buffer_update_callback, ifp);
-        }
         set_timeout(&ifp->update_timeout, ifp->update_interval);
         ifp->last_update_time = now.tv_sec;
     }

message.h

@@ -41,7 +41,6 @@ THE SOFTWARE.
 extern unsigned short myseqno;
 extern struct timeval seqno_time;
 
-extern int parasitic;
 extern int broadcast_ihu;
 extern int split_horizon;