add pty support to ssh client

pty and tty support was not enabled or working in the code. Without pty
support, ssh client was very non functional - e.g. openssh linux server
prompt would not come through. Now ssh client works much better in
interactive mode ( uses pty).

clientloop.c

@@ -2563,6 +2563,7 @@ client_session2_setup(int id, int want_tty, int want_subsystem,
 		tty_make_modes(-1, tiop);
 		
 #else
+		packet_put_cstring(term != NULL ? term : "");
 		packet_put_int((u_int) 80 /*ws.ws_col*/);
 		packet_put_int((u_int) 25 /*ws.ws_row*/);
 		packet_put_int((u_int) 640 /*ws.ws_xpixel*/);

contrib/win32/win32compat/sfds.c

@@ -264,6 +264,12 @@ int sfd_to_fd(int sfd)
   return sfd_map[sfd].fd;
 }
 
+// set the sfd type to console. GetFileType() in Windows seem to return wrong type for a console returning PIPE (3) in place of CHARTYPE (2)
+void sfd_set_to_console(int sfd)
+{
+	sfd_map[sfd].type = SFD_TYPE_CONSOLE;
+}
+
 /*
  * For an sfd, get the real handle behind it 
  */

contrib/win32/win32compat/socket.c

@@ -227,11 +227,11 @@ int WSHELPisatty(int sfd)
    * We can only do this for console fds.
    */
   
-  if (sfd_is_console(sfd) && sfd > 0)
+  if (sfd_is_console(sfd) && sfd >= 0)
   {
-    ret = _isatty(sfd_to_fd(sfd));
+    //ret = _isatty(sfd_to_fd(sfd));
 
-    return ret;
+    return 1 ; //ret;
   }
 
   /*
@@ -2825,7 +2825,11 @@ void allocate_standard_descriptor(int fd)
 {
   DBG_MSG("-> allocate_standard_descriptor(fd = %d)...\n", fd);
   
-  allocate_sfd(fd);
+  int asfd = allocate_sfd(fd);
+
+  void sfd_set_to_console(int sfd);
+  if (asfd >= 0)
+	  sfd_set_to_console(asfd);
   
   DBG_MSG("<- allocate_standard_descriptor()...");
 }

session.c

@@ -1205,7 +1205,8 @@ do_exec_pty(Session *s, const char *command)
    * Win32 code.
    */
    
-  return 0;
+  //return 0;
+  return do_exec_pty(s, command);
 
 #endif 
 }