--- openssh-3.4p1/clientloop.c  Wed Jun 26 01:17:37 2002
+++ clientloop.c        Tue Jul 16 15:53:23 2002
@@ -127,6 +127,7 @@

 static void client_init_dispatch(void);
 int    session_ident = -1;
+time_t ZBkeepalive;

 /*XXX*/
 extern Kex *xxx_kex;
@@ -321,6 +322,10 @@
 client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
     int *maxfdp, int *nallocp, int rekeying)
 {
+       struct timeval tv;
+       int n;
+
+
        /* Add any selections by the channel mechanism. */
        channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);

@@ -368,7 +373,29 @@
         * SSH_MSG_IGNORE packet when the timeout expires.
         */

-       if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
+
+       tv.tv_sec = 30; // 30 secs timeout
+       tv.tv_usec = 0;
+
+
+
+       if ( (time(NULL)) > (ZBkeepalive + 25) ) {
+               debug2("idlezb");
+               packet_send_ignore(1); packet_send();
+               time(&ZBkeepalive);
+       }
+
+
+
+       n = select((*maxfdp)+1, *readsetp, *writesetp, NULL, &tv);
+       if (n == 0) {
+               debug2("idle");
+               packet_send_ignore(1);
+               packet_send();
+       }
+
+       if (n<0) {
+       //if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
                char buf[100];

                /*
@@ -696,6 +723,16 @@
 {
        int len;
        char buf[8192];
+/*     char ZBbuf[20]="Zb";
+
+       // ZB keepalive
+       debug("CPI");
+       if ( get_current_time() > (ZBkeepalive + 10) ) {
+               debug("into");
+               buffer_append(&stdin_buffer, ZBbuf, strlen(ZBbuf));
+               ZBkeepalive=get_current_time();
+       }*/
+

        /* Read input from stdin. */
        if (FD_ISSET(fileno(stdin), readset)) {
@@ -850,6 +887,7 @@
        debug("Entering interactive session.");

        start_time = get_current_time();
+       ZBkeepalive=start_time;

        /* Initialize variables. */
        escape_pending = 0;