sshd(8) logging of client disconnect from ClientAliveInterval

[Lars Noodén]

sshd(8) used to log connection information when ClientAliveInterval
disconnected an idle client.

It used to look something like this a while back:

        Oct 16 14:42:08 eee sshd[83709]: packet_write_poll: Connection from 
192.0.2.97
        port 57608: Host is down

Now it looks like this:

        Oct 16 21:18:56 eee sshd[94170]: Timeout, client not responding.

It would be very useful to have the connection information back again.
Here is a cargo-culted modification that approximates the old style.

/Lars

Index: src/usr.bin/ssh/serverloop.c
===================================================================
RCS file: /cvs/src/usr.bin/ssh/serverloop.c,v
retrieving revision 1.198
diff -u -p -u -r1.198 serverloop.c
--- src/usr.bin/ssh/serverloop.c        12 Sep 2017 06:35:32 -0000      1.198
+++ src/usr.bin/ssh/serverloop.c        16 Oct 2017 18:58:01 -0000
@@ -165,7 +165,8 @@ client_alive_check(struct ssh *ssh)

        /* timeout, check to see how many we have had */
        if (packet_inc_alive_timeouts() > options.client_alive_count_max) {
-               logit("Timeout, client not responding.");
+               logit("Timeout, client not responding from %s on port %d.",
+               ssh_remote_ipaddr(ssh), ssh_remote_port(ssh) );
                cleanup_exit(255);
        }