how to log dropped sessions

There is currently no command that returns the amount of idle time a connection has experienced. I will look into adding this to the IP::stats command.

The IP::stats command currently has the following options:

IP::stats pkts in - returns number of packets received

IP::stats pkts out - returns number of packets sent

IP::stats pkts - returns a Tcl list of packets in and packets out

IP::stats bytes in - returns number of bytes received

IP::stats bytes out - returns number of bytes sent

IP::stats bytes - returns a Tcl lost of bytes in and bytes out

IP::stats age - returns the age of the connection in seconds

(number of seconds since 3-way handshake completed).

The CLIENT_CLOSED event can be used to check the above stats when the connection is closed.

You could therefore attempt to synthesize the idle time like so:

 
 when CLIENT_ACCEPTED { 
    set prev_age 0 
 } 
 when HTTP_REQUEST { 
    set prev_age [IP::stats age] 
 } 
 when HTTP_RESPONSE { 
    set prev_age [IP::stats age] 
 } 
 when CLIENT_CLOSED { 
    if { [expr [IP::stats age] - $prev_age] > [IP::idle_timeout] } { 
       log "Client: [IP::remote_addr]:[TCP::remote_port] timed out" 
    } 
 } 
 

I have created a CR to add the following additional option to the IP::stat command:

IP::stats idle - return the number of seconds the connection has been idle.