Implement SSH1 support for ServerAliveInterval using SSH_MSG_IGNORE. As

documented in ssh_config(5), it's not as good as the SSH2 version.

1 files changed, 12 insertions, 7 deletions

diff --git a/clientloop.c b/clientloop.c
index 626b29a5a..a13d06ddf 100644
--- a/clientloop.c
+++ b/clientloop.c
@@ -324,12 +324,17 @@ client_global_request_reply(int type, u_int32_t seq, void *ctxt)
 static void
 server_alive_check(void)
 {
-        if (++server_alive_timeouts > options.server_alive_count_max)
-                packet_disconnect("Timeout, server not responding.");
-        packet_start(SSH2_MSG_GLOBAL_REQUEST);
-        packet_put_cstring("keepalive@openssh.com");
-        packet_put_char(1);     /* boolean: want reply */
-        packet_send();
+        if (compat20) {
+                if (++server_alive_timeouts > options.server_alive_count_max)
+                        packet_disconnect("Timeout, server not responding.");
+                packet_start(SSH2_MSG_GLOBAL_REQUEST);
+                packet_put_cstring("keepalive@openssh.com");
+                packet_put_char(1);     /* boolean: want reply */
+                packet_send();
+        } else {
+                packet_send_ignore(0);
+                packet_send();
+        }
 }
 
 /*
@@ -388,7 +393,7 @@ client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
          * event pending.
          */
 
-        if (options.server_alive_interval == 0 || !compat20)
+        if (options.server_alive_interval == 0)
                 tvp = NULL;
         else {  
                 tv.tv_sec = options.server_alive_interval;