check in for Bug 6959

Add the ability to run a user defined script to determine wan load-balancing interface health

includes sample http test (scripts/http_test.pl). Configuration will look as follows:

 wan {
     interface-health eth0 {
         nexthop 10.3.0.1
         test 1 {
             test-script /tmp/http_test.pl
             type user-defined
         }
     }
     interface-health eth1 {
         nexthop 10.3.0.1
         test 1 {
             test-script /tmp/http_test.pl
             type user-defined
         }
     }

With corresponding output:

vyatta@vyatta# run show wan-load-balance
Interface:  eth0
  Status:  active
  Last Status Change:  Wed Mar 30 19:03:59 2011
  +Test:  user  Script: /tmp/http_test.pl
    Last Interface Success:  0s
    Last Interface Failure:  n/a
    # Interface Failure(s):  0

Interface:  eth1
  Status:  failed
  Last Status Change:  Wed Mar 30 19:03:59 2011
  -Test:  user  Script: /tmp/http_test.pl
    Last Interface Success:  n/a
    Last Interface Failure:  0s
    # Interface Failure(s):  52

Scripts returns 0 for success, non-zero for failure.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/lbtest.hh b/src/lbtest.hh
index 208adaa..4463315 100644
--- a/src/lbtest.hh
+++ b/src/lbtest.hh
@@ -59,12 +59,15 @@ public:
   virtual string
   dump() = 0;
 
-  int
+  virtual int
   recv(LBHealth &health);
 
   virtual string
   name() = 0;
 
+  virtual string
+  status() {return _status_line;}
+
 private:
   int
   receive(int recv_sock);
@@ -75,6 +78,8 @@ public:
   string _target;
   int    _resp_time;
   int _state;
+  string _status_line;
+  
 
   static int _recv_icmp_sock;
   static int _send_raw_sock;