Workaround TTSSH client crash with hostkeys-00@openssh.com messages in
OpenSSH 6.8p1.

  http://en.sourceforge.jp/ticket/browse.php?group_id=1412&tid=35010
  http://en.sourceforge.jp/projects/ttssh2/scm/svn/commits/5829

--- compat.c.orig	2015-03-17 00:49:20.000000000 -0500
+++ compat.c	2015-04-09 15:13:35.061239000 -0500
@@ -167,6 +167,17 @@ compat_datafellows(const char *version)
 					SSH_BUG_SCANNER },
 		{ "Probe-*",
 					SSH_BUG_PROBE },
+		{ "TTSSH/1.5.*,"
+		  "TeraTerm SSH*,"
+		  "TTSSH/2.1*,"
+		  "TTSSH/2.2*,"
+		  "TTSSH/2.3*,"
+		  "TTSSH/2.4*,"
+		  "TTSSH/2.5*,"
+		  "TTSSH/2.6*,"
+		  "TTSSH/2.70*,"
+		  "TTSSH/2.71*,"
+		  "TTSSH/2.72*",	SSH_BUG_HOSTKEYS },
 		{ NULL,			0 }
 	};
 
--- compat.h.orig	2015-04-08 21:02:42.865971000 -0500
+++ compat.h	2015-04-08 21:04:06.865029000 -0500
@@ -60,6 +60,7 @@
 #define SSH_NEW_OPENSSH		0x04000000
 #define SSH_BUG_DYNAMIC_RPORT	0x08000000
 #define SSH_BUG_CURVE25519PAD	0x10000000
+#define SSH_BUG_HOSTKEYS	0x20000000
 
 void     enable_compat13(void);
 void     enable_compat20(void);
--- sshd.c.orig	2015-04-08 21:01:02.944936000 -0500
+++ sshd.c	2015-04-08 21:03:55.086137000 -0500
@@ -2321,7 +2321,7 @@
 	    options.client_alive_count_max);
 
 	/* Try to send all our hostkeys to the client */
-	if (compat20)
+	if (compat20 && (datafellows & SSH_BUG_HOSTKEYS) == 0)
 		notify_hostkeys(active_state);
 
 	/* Start session. */