[bgpd] Fix triggerable crash when compiled with --disable-bgp-announce

2008-07-22 Paul Jakma <paul.jakma@sun.com>

	* HACKING: Document preference for compiler conditional code, over
	  cpp conditional.
	* configure.ac: DISABLE_BGP_ANNOUNCE always should be defined.
	* bgp_{packet,route,advertise}.c: change to compiler testing of
	  DISABLE_BGP_ANNOUNCE, rather than cpp.

2008-07-22 MIYAJIMA Mitsuharu <miyajima.mitsuharu@anchor.jp>

	* bgp_packet.c: (bgp_update_packet_eor) Fix crash triggerable
	  if a bgpd was compiled with --disable-bgp-announce and if GR is
	  advertised by peer.
diff --git a/bgpd/bgp_packet.c b/bgpd/bgp_packet.c
index 623fd9e..4d7f32d 100644
--- a/bgpd/bgp_packet.c
+++ b/bgpd/bgp_packet.c
@@ -235,9 +235,8 @@
   struct stream *s;
   struct stream *packet;
 
-#ifdef DISABLE_BGP_ANNOUNCE
-  return;
-#endif /* DISABLE_BGP_ANNOUNCE */
+  if (DISABLE_BGP_ANNOUNCE)
+    return NULL;
 
   if (BGP_DEBUG (normal, NORMAL))
     zlog_debug ("send End-of-RIB for %s to %s", afi_safi_print (afi, safi), peer->host);
@@ -369,9 +368,8 @@
   char attrstr[BUFSIZ];
   char buf[BUFSIZ];
 
-#ifdef DISABLE_BGP_ANNOUNCE
-  return;
-#endif /* DISABLE_BGP_ANNOUNCE */
+  if (DISABLE_BGP_ANNOUNCE)
+    return;
 
   if (afi == AFI_IP)
     str2prefix ("0.0.0.0/0", &p);
@@ -438,9 +436,8 @@
   bgp_size_t total_attr_len;
   char buf[BUFSIZ];
 
-#ifdef DISABLE_BGP_ANNOUNCE
-  return;
-#endif /* DISABLE_BGP_ANNOUNCE */
+  if (DISABLE_BGP_ANNOUNCE)
+    return;
 
   if (afi == AFI_IP)
     str2prefix ("0.0.0.0/0", &p);
@@ -958,9 +955,8 @@
   struct bgp_filter *filter;
   int orf_refresh = 0;
 
-#ifdef DISABLE_BGP_ANNOUNCE
-  return;
-#endif /* DISABLE_BGP_ANNOUNCE */
+  if (DISABLE_BGP_ANNOUNCE)
+    return;
 
   filter = &peer->filter[afi][safi];