debug.c 3.03 KB
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/* debug.c
 *
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 */
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/* lsh, an implementation of the ssh protocol
 *
 * Copyright (C) 1998 Niels Mller
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */

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#if HAVE_CONFIG_H
#include "config.h"
#endif

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#include "connection.h"
#include "format.h"
#include "parse.h"
#include "ssh.h"
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#include "xalloc.h"
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#include "werror.h"
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#include "debug.c.x"

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/* GABA:
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   (class
     (name packet_debug)
     (super abstract_write_pipe)
     (vars
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       (prefix string)))
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*/

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static void
do_debug(struct abstract_write *w,
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	 struct lsh_string *packet)
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{
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  CAST(packet_debug, closure, w);
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  if (!packet->length)
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    debug("DEBUG: %S empty packet\n", closure->prefix);
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  else
    {
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      uint8_t type = packet->data[0];
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      if (type == SSH_MSG_USERAUTH_REQUEST)
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	debug("DEBUG: %S %z *****\n",
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	      closure->prefix, packet_types[type]);
      else
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	debug("DEBUG: %S %z %xS\n",
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	      closure->prefix, packet_types[type],
	      packet);
    }
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  A_WRITE(closure->super.next, packet);
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}

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struct abstract_write *
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make_packet_debug(struct abstract_write *next,
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		  struct lsh_string *prefix)
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{
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  NEW(packet_debug, closure);
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  closure->super.super.write = do_debug;
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  closure->super.next = next;
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  closure->prefix = prefix;
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  return &closure->super.super;
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}

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static struct lsh_string *
make_debug_packet(const char *msg, int always_display)
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{
  return ssh_format("%c%c%z%z",
		    SSH_MSG_DEBUG,
		    always_display,
		    msg,
		    /* Empty language tag */ 
		    "");
}

/* Send a debug message to the other end. */
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void
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send_debug_message(struct ssh_connection *connection,
		   const char *msg, int always_display)
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{
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  /* Can be sent even during key exchange. */
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  connection_send_kex(connection, make_debug_packet(msg, always_display));
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}

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DEFINE_PACKET_HANDLER(, connection_debug_handler, connection UNUSED, packet)
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{
  struct simple_buffer buffer;
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  unsigned msg_number;
  unsigned always_display;
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  uint32_t length;
  const uint8_t *msg;
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  int language;
  
  simple_buffer_init(&buffer, packet->length, packet->data);

  if (!(parse_uint8(&buffer, &msg_number)
	&& parse_uint8(&buffer, &always_display)
	&& parse_string(&buffer, &length, &msg)
	&& parse_atom(&buffer, &language)
	&& parse_eod(&buffer)))
    {
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      PROTOCOL_ERROR(connection->e, "Invalid DEBUG message.");
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    }
  else
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    {
      if (always_display)
	werror("Received debug: %ups\n", length, msg);
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      else
	verbose("Received debug: %ups\n", length, msg);
    }
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}