Fix bugs in vty error handlingex25b

Advance version to 0.99.20ex25b.

Bug fixes:

  * when closing a vty, if close() returned an error, the vtys would
    fall into a loop trying to recover.

    This was found on FreeBSD, which will return ECONNRESET on close(),
    which is not standard POSIX behaviour.

  * when closing a vty in response to EPIPE or ECONNRESET, managed to
    leave the vty mutex locked.

    This stopped the Routing Engine *dead* on the next CLI command
    that required the Routing Engine.  SIGTERM/SIGINT would not
    stop bgpd -- a SIGKILL would be required.

Other changes:

  * toned down the error reporting of EPIPE in the vty -- so no
    longer looks like an error...

      ...closing a vty by "exit" command is logged as "closed"

      ...closing a vty in response to the client closing their end of
         the connection is logged as "terminated: terminal closed",
         and no longer logs an EPIPE error.

  * changed error reporting on close() and shutdown() for vty, so
    that nothing is logged if an i/o error has already logged...

    ...so that redundant error messages are suppressed.

  * applied slightly finer jittering to bgpd timers.

  * work in progress on new vtysh.

1 files changed, 3 insertions, 5 deletions

diff --git a/lib/vty_io_term.c b/lib/vty_io_term.c
index 7ef7e0df..fc0fd8f0 100644
--- a/lib/vty_io_term.c
+++ b/lib/vty_io_term.c
@@ -431,17 +431,15 @@ uty_term_write_close(vio_vf vf)
    */
   if (vio->state & vst_final)
     {
-      const char* reason, * sep ;
+      const char* reason ;
 
       vf->cli = uty_cli_free(vf->cli) ;
 
       reason = qs_string(vf->vio->close_reason) ;
-      sep    = ": " ;
       if ((reason == NULL) || (*reason == '\0'))
-        reason = sep = "" ;
+        reason = "closed" ;
 
-      zlog_info("VTY connection (fd %d) closed%s%s",
-                                             vio_vfd_fd(vf->vfd), sep, reason) ;
+      zlog_info("VTY connection (fd %d) %s", vio_vfd_fd(vf->vfd), reason) ;
     }
   else if (vf_active(vf->vout_state))
     {