text: /* $OpenBSD: ssh.h,v 1.78 2006/08/03 03:34:42 deraadt Exp $ */
  
  /*
   * Author: Tatu Ylonen <ylo@cs.hut.fi>
   * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
   *                    All rights reserved
   *
   * As far as I am concerned, the code I have written for this software
   * can be used freely for any purpose.  Any derived versions of this
   * software must be clearly marked as such, and if the derived work is
   * incompatible with the protocol description in the RFC file, it must be
   * called by a name other than "ssh" or "Secure Shell".
   */
  
  /* Cipher used for encrypting authentication files. */
  #define SSH_AUTHFILE_CIPHER	SSH_CIPHER_3DES
  
  /* Default port number. */
  #define SSH_DEFAULT_PORT	22
  
  /* Maximum number of TCP/IP ports forwarded per direction. */
  #define SSH_MAX_FORWARDS_PER_DIRECTION	100
  
  /*
   * Maximum number of RSA authentication identity files that can be specified
   * in configuration files or on the command line.
   */
  #define SSH_MAX_IDENTITY_FILES		100
  
  /*
   * Maximum length of lines in authorized_keys file.
   * Current value permits 16kbit RSA and RSA1 keys and 8kbit DSA keys, with
   * some room for options and comments.
   */
  #define SSH_MAX_PUBKEY_BYTES		8192
  
  /*
   * Major protocol version.  Different version indicates major incompatibility
   * that prevents communication.
   *
   * Minor protocol version.  Different version indicates minor incompatibility
   * that does not prevent interoperation.
   */
  #define PROTOCOL_MAJOR_1	1
  #define PROTOCOL_MINOR_1	5
  
  /* We support both SSH1 and SSH2 */
  #define PROTOCOL_MAJOR_2	2
  #define PROTOCOL_MINOR_2	0
  
  /*
   * Name for the service.  The port named by this service overrides the
   * default port if present.
   */
  #define SSH_SERVICE_NAME	"ssh"
  
  /*
   * Name of the environment variable containing the process ID of the
   * authentication agent.
   */
  #define SSH_AGENTPID_ENV_NAME	"SSH_AGENT_PID"
  
  /*
   * Name of the environment variable containing the pathname of the
   * authentication socket.
   */
  #define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
  
  /*
   * Environment variable for overwriting the default location of askpass
   */
  #define SSH_ASKPASS_ENV		"SSH_ASKPASS"
  
  /*
   * Force host key length and server key length to differ by at least this
   * many bits.  This is to make double encryption with rsaref work.
   */
  #define SSH_KEY_BITS_RESERVED		128
  
  /*
   * Length of the session key in bytes.  (Specified as 256 bits in the
   * protocol.)
   */
  #define SSH_SESSION_KEY_LENGTH		32
  
  /* Used to identify ``EscapeChar none'' */
  #define SSH_ESCAPECHAR_NONE		-2
  
  /*
   * unprivileged user when UsePrivilegeSeparation=yes;
   * sshd will change its privileges to this user and its
   * primary group.
   */
  #ifndef SSH_PRIVSEP_USER
  #define SSH_PRIVSEP_USER		"sshd"
  #endif
  
  /* Minimum modulus size (n) for RSA keys. */
  #define SSH_RSA_MINIMUM_MODULUS_SIZE	768
  
  /* Listen backlog for sshd, ssh-agent and forwarding sockets */
  #define SSH_LISTEN_BACKLOG		128
  