From a34b09349e809a6d8f696fb0897c0bfdc3b66159 Mon Sep 17 00:00:00 2001
From: Ondrej Zajicek <santiago@crfreenet.org>
Date: Mon, 31 May 2010 11:35:29 +0200
Subject: Disable BGP protocol when cannot open listening socket.

---
 proto/bgp/bgp.c | 17 +++++++++++++----
 proto/bgp/bgp.h |  1 +
 2 files changed, 14 insertions(+), 4 deletions(-)

(limited to 'proto/bgp')

diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c
index 253322c..932c8aa 100644
--- a/proto/bgp/bgp.c
+++ b/proto/bgp/bgp.c
@@ -97,6 +97,15 @@ bgp_open(struct bgp_proto *p)
   if (!bgp_listen_sk)
     bgp_listen_sk = bgp_setup_listen_sk(cfg->listen_bgp_addr, cfg->listen_bgp_port, cfg->listen_bgp_flags);
 
+  if (!bgp_listen_sk)
+    {
+      bgp_counter--;
+      p->p.disabled = 1;
+      bgp_store_error(p, NULL, BE_MISC, BEM_NO_SOCKET);
+      proto_notify_state(&p->p, PS_DOWN);
+      return -1;
+    }
+
   if (!bgp_linpool)
     bgp_linpool = lp_new(&root_pool, 4080);
 
@@ -630,14 +639,14 @@ bgp_listen_sock_err(sock *sk UNUSED, int err)
   if (err == ECONNABORTED)
     log(L_WARN "BGP: Incoming connection aborted");
   else
-    log(L_ERR "BGP: Error on incoming socket: %M", err);
+    log(L_ERR "BGP: Error on listening socket: %M", err);
 }
 
 static sock *
 bgp_setup_listen_sk(ip_addr addr, unsigned port, u32 flags)
 {
   sock *s = sk_new(&root_pool);
-  DBG("BGP: Creating incoming socket\n");
+  DBG("BGP: Creating listening socket\n");
   s->type = SK_TCP_PASSIVE;
   s->saddr = addr;
   s->sport = port ? port : BGP_PORT;
@@ -649,7 +658,7 @@ bgp_setup_listen_sk(ip_addr addr, unsigned port, u32 flags)
   s->err_hook = bgp_listen_sock_err;
   if (sk_open(s))
     {
-      log(L_ERR "BGP: Unable to open incoming socket");
+      log(L_ERR "BGP: Unable to open listening socket");
       rfree(s);
       return NULL;
     }
@@ -937,7 +946,7 @@ bgp_check(struct bgp_config *c)
 
 static char *bgp_state_names[] = { "Idle", "Connect", "Active", "OpenSent", "OpenConfirm", "Established", "Close" };
 static char *bgp_err_classes[] = { "", "Error: ", "Socket: ", "Received: ", "BGP Error: ", "Automatic shutdown: ", ""};
-static char *bgp_misc_errors[] = { "", "Neighbor lost", "Invalid next hop", "Kernel MD5 auth failed" };
+static char *bgp_misc_errors[] = { "", "Neighbor lost", "Invalid next hop", "Kernel MD5 auth failed", "No listening socket" };
 static char *bgp_auto_errors[] = { "", "Route limit exceeded"};
 
 static const char *
diff --git a/proto/bgp/bgp.h b/proto/bgp/bgp.h
index 39a87a6..c81fe62 100644
--- a/proto/bgp/bgp.h
+++ b/proto/bgp/bgp.h
@@ -275,6 +275,7 @@ void bgp_log_error(struct bgp_proto *p, u8 class, char *msg, unsigned code, unsi
 #define BEM_NEIGHBOR_LOST	1
 #define BEM_INVALID_NEXT_HOP	2
 #define BEM_INVALID_MD5		3	/* MD5 authentication kernel request failed (possibly not supported) */
+#define BEM_NO_SOCKET		4
 
 /* Automatic shutdown error codes */
 
-- 
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