path: root/lib/ssh/doc/src/notes.xml

<?xml version="1.0" encoding="latin1" ?>
<!DOCTYPE chapter SYSTEM "chapter.dtd">

<chapter>
  <header>
    <copyright>
      <year>2004</year><year>2011</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.

      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.

    </legalnotice>

    <title>SSH Release Notes</title>
    <prepared></prepared>
    <docno></docno>
    <date></date>
    <rev>%VSN%</rev>
    <file>notes.xml</file>
  </header>

<section><title>Ssh 2.0.7</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            An unexpected message would crash the ssh_connection_handler and close
            the connection. Now an error message is generated instead.</p>
          <p>
            Own Id: OTP-9273</p>
        </item>
      </list>
    </section>
</section>

<section><title>Ssh 2.0.6</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            A memory leak has been fixed. I.e. per terminated connection the size of
            a pid and the length of a user name string was not cleared.</p>
          <p>
            Own Id: OTP-9232</p>
        </item>
      </list>
    </section>
</section>

<section><title>Ssh 2.0.5</title>
    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            Strengthened random number generation. (Thanks to Geoff Cant)</p>
          <p>
            Own Id: OTP-9225</p>
        </item>
      </list>
    </section>
</section>

<section><title>Ssh 2.0.4</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>In some cases SSH returned {error, normal} when a channel was terminated
             unexpectedly. This has now been changed to {error, channel_closed}.</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
            Own Id: OTP-8987 Aux Id: seq11748</p>
        </item>
        <item>
          <p>
            SSH did not handle the error reason enetunreach
            when trying to open a IPv6 connection.</p>
          <p>
            Own Id: OTP-9031</p>
        </item>
      </list>
    </section>
    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            It is now possible to use SSH to sign and verify binary data.</p>
          <p>
            Own Id: OTP-8986</p>
        </item>
        <item>
          <p>
            SSH now ensures that the .ssh directory exists before trying
            to access files located in that directory.</p>
          <p>
            Own Id: OTP-9010</p>
        </item>
      </list>
    </section>
</section>

<section><title>Ssh 2.0.3</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            The fix regarding OTP-8849 was not included in the
            previous version as stated.</p>
          <p>
            Own Id: OTP-8918</p>
        </item>
      </list>
    </section>
</section>

<section><title>Ssh 2.0.2</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            The ssh_system_sup did not catch noproc and shutdown
            messages.</p>
          <p>
            Own Id: OTP-8863</p>
        </item>
        <item>
          <p>
            In some cases a crash report was generated when a
            connection was closing down. This was caused by a race
            condition between two processes.</p>
          <p>
            Own Id: OTP-8881 Aux Id: seq11656, seq11648 </p>
        </item>
      </list>
    </section>
    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            SSH no longer use deprecated public_key functions.</p>
          <p>
            Own Id: OTP-8849</p>
        </item>
      </list>
    </section>
 </section>
 <section><title>Ssh 2.0.1</title>
    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
	    SSH in some cases terminated channels with reason normal
	    when it should have been shutdown.</p>
          <p>
	    Own Id: OTP-8714</p>
        </item>
        <item>
          <p>
	    SSH in some cases generated a crash report when a channel
	    was closed in a normal way.</p>
          <p>
	    Own Id: OTP-8735 Aux Id: seq11615 </p>
        </item>
        <item>
          <p>
	    The processes ssh_subsystem_sup and one ssh_channel_sup
	    was not terminated when a connection was closed.</p>
          <p>
	    Own Id: OTP-8807</p>
        </item>
      </list>
    </section>

</section>

<section><title>Ssh 2.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>The function ssh:connect/4 was not exported.</p>
          <p>Own Id: OTP-8550 Aux Id:</p>
        </item>
        <item>
          <p>Aligned error message with used version (SSH_FX_FAILURE vs
             SSH_FX_NOT_A_DIRECTORY, the latter introduced in version 6).</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-8644 Aux Id: seq11574</p>
        </item>
        <item>
          <p>Resolved race condition when another connection is started
             before a channel is opened in the first connection.</p>
          <p>Own Id: OTP-8645 Aux Id: seq11577</p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>The configuration parameter ip_v6_disabled is now available,
             which makes it possible for the user to alter the IP version
             SSH shall use.</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-8535 Aux Id:</p>
        </item>
        <item>
          <p>The ssh_connection:send operation now accepts infinity as timeout.</p>
          <p>Own Id: OTP-8534 Aux Id:</p>
        </item>
        <item>
          <p>The connection handler now include stack traces when a channel 
             message is not handled correctly.</p>
          <p>Own Id: OTP-8524 Aux Id:</p>
        </item>
        <item>
          <p>Removed deprecated modules (ssh_ssh, ssh_sshd and ssh_cm) and
             functions (ssh_sftp:connect and ssh_sftp:stop).</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>Own Id: OTP-8596 Aux Id:</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.8</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            In some cases SSH ceased to collect more data from the transport layer.</p>
          <p>
            Own Id: OTP-8401 Aux Id: seq11479</p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>Old release notes removed.</p>
          <p>Own Id: OTP-8356 Aux Id:</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.7</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            Now clear all processes when a connnection is terminated.</p>
          <p>
            Own Id: OTP-8121 Aux Id:</p>
        </item>
        <item>
          <p>
            In some rare cases the connection handler could enter an infinite loop.</p>
          <p>
            Own Id: OTP-8277 Aux Id: seq11428</p>
        </item>
        <item>
          <p>
            If an SFTP server did not respond with EOF, the function 
            ssh_sftp:list_dir/2/3 would enter an infinite loop.</p>
          <p>
            Own Id: OTP-8278 Aux Id: seq11450</p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            The documentation is now built with open source tools (xsltproc and fop) 
            that exists on most platforms. One visible change is that the frames are removed.</p>
          <p>
            Own Id: OTP-8201 Aux Id:</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.6</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            ssh_sftp:start_channel did not handle all possible return 
            values from ssh_channel:start correctly.
          </p>
          <p>
            Own Id: OTP-8176 Aux Id: </p>
        </item>
        <item>
          <p>
            SFTPD did not handle rename command (version 4) correctly.
          </p>
          <p>
            Own Id: OTP-8175 Aux Id: seq11373</p>
        </item>
        <item>
          <p>
            If a connection manager already had been terminated it could cause a channel
            to generate a crash report when it was about to stop.
          </p>
          <p>
            Own Id: OTP-8174 Aux Id: seq11377</p>
        </item>
        <item>
          <p>
            Requests could result in badarg or badmatch EXIT messages in the connection 
            manager if the channel no longer existed.</p>
          <p>
            Own Id: OTP-8173 Aux Id: seq11379</p>
        </item>
        <item>
          <p>
            ssh_transport:unpack/3 could cause a badarg error.</p>
          <p>
            Own Id: OTP-8162 Aux Id:</p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            The encryption algorithm aes128-cbc is now supported.
            Requires that crypto-1.6.1 is available.</p>
          <p>
            Own Id: OTP-8110 Aux Id:</p>
        </item>
      </list>
    </section>

 </section>


 <section><title>Ssh 1.1.5</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            ssh_sftp:start_channel/3 did not handle timout correctly.</p>
          <p>
            Own Id: OTP-8159 Aux Id: seq11386</p>
        </item>
        <item>
          <p>
            If a progress message was not recieved after invoking ssh:connect/3
            the call could hang for ever. A timeout option has also been added.</p>
          <p>
            Own Id: OTP-8160 Aux Id: seq11386</p>
        </item>
        <item>
          <p>
            A comma has been missing in the ssh.appup file since SSH-1.0.2.</p>
          <p>
            Own Id: OTP-8161 Aux Id:</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.4</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            SSH sometimes caused a crash report at disconnect.</p>
          <p>
            Own Id: OTP-8071 Aux Id: seq11319</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.3</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            The operation ssh_sftp:stop_channel/1 returned an 
            exception if the connection already had been closed.</p>
          <p>
            Own Id: OTP-7996 Aux Id: seq11281</p>
        </item>
        <item>
          <p>
            SSH did not handle if supervisor:start_child/2 returned 
            {error, already_present}.</p>
          <p>
            Own Id: OTP-8034 Aux Id: seq11307</p>
        </item>
        <item>
          <p>
            SSH no longer cause supervisor reports when a connection is 
            terminated in a controlled manner.</p>
          <p>
            Own Id: OTP-8035 Aux Id: seq11308</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.2</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            Ssh confused local and remote channel id's, which in some
            cases resulted in that messages were discarded.</p>
          <p>
            Own Id: OTP-7914 Aux Id: seq11234</p>
        </item>
        <item>
          <p>
            Ssh could not handle echo values other than 0 and 1.</p>
          <p>
            Own Id: OTP-7917 Aux Id: seq11238</p>
        </item>
        <item>
          <p>
            A crash occurred if a non-valid channel reference was received.</p>
          <p>
            Own Id: OTP-7918 Aux Id: seq11238</p>
        </item>
        <item>
          <p>
            Sftpd connections was not closed after receiving eof from a client.</p>
          <p>
            Own Id: OTP-7921 Aux Id: seq11222</p>
        </item>
        <item>
          <p>
            It was not possible to start a SFTP subsystem on certain platforms, 
            i.e. those who do not support symbolic links.</p>
          <p>
            Own Id: OTP-7930 Aux Id: </p>
        </item>
        <item>
          <p>
            In some cases the message {ssh_cm, ssh_connection_ref(), {closed, ssh_channel_id()}}
            was not passed to the registered callback module.</p>
          <p>
            Own Id: OTP-7957 Aux Id: </p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            By using the sftpd option {max_files, Integer}, the message
            size for READDIR commands can be reduced.</p>
          <p>
            Own Id: OTP-7919 Aux Id: seq11230</p>
        </item>
      </list>
    </section>

 </section>

 <section><title>Ssh 1.1.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            The erlang ssh server has presented itself incorrectly,
            using the special version ssh-1.99, although it never has
            supported versions below 2.0. Since ssh-1.1 client
            versions below 2.0 are correctly rejected instead of
            letting the server crash later on. Alas the problem with
            the presentation string was not discovered until after
            ssh.1.1 was released. Now the server will present itself
            as ssh-2.0.</p>
          <p>
            Own Id: OTP-7795</p>
        </item>
        <item>
          <p>
            An internal function call used an incorrect parameter, which
            caused problem when the old listen API was used. This was
            introduced in Ssh-1.1.</p>
          <p>
            Own Id: OTP-7920 Aux Id: seq11211</p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            Ssh timeouts will now behave as expected e.i. defaults to
            infinity only the user of the ssh application can know of
            a reasonable timeout value for their application.</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
            Own Id: OTP-7807</p>
        </item>
        <item>
          <p>
            The implementation of timeouts added as a patch in
            ssh-1.0.1 was slightly changed and is now documented.</p>
          <p>
            Own Id: OTP-7808</p>
        </item>
        <item>
          <p>
            To honor the multiplexing of channels over one ssh
            connection concept ssh_sftp:connect/ [1,2,3] is
            deprecated and replaced by ssh_sftp:start_channel/[1,2,3]
            and ssh_sftp:stop/1 is deprecated and replaced by
            ssh_sftp:stop_channel/1 and to stop the ssh connection
            ssh:close/ 1 should be called.</p>
          <p>
            Own Id: OTP-7809</p>
        </item>
        <item>
          <p>
            Added the message {ssh_channel_up, ChannelId,
            ConnectionManager} that shall be handled by the channel
            callback handle_msg/2. This makes the function
            handle_msg/2 a mandatory function for ssh channels
            implementations which it was not in ssh-1.1.</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
            Own Id: OTP-7828</p>
        </item>
      </list>
    </section>

 </section>

  <section><title>Ssh 1.1</title>
  
  <section><title>Fixed Bugs and Malfunctions</title>
  <list>
    <item>
      <p>
	A flaw in the implementation of the supervision tree
	caused the ssh daemon to close the connections to all
	currently logged in users if one user logged out. Another
	problem related to the supervision tree caused the closing
	down of clients to leak processes e.i. all processes was
      not shutdown correctly.</p>
      <p>
      Own Id: OTP-7676</p>
    </item>
    <item>
      <p>
	Tabs could cause ssh_cli to print things in a surprising
      way.</p>
      <p>
      Own Id: OTP-7683 Aux Id: seq11102 </p>
    </item>
    <item>
      <p>
	[sftp, sftpd] - Added patch to make sftp timestamps more
	correct, in the long run it would be nice to have better
	support in file to be able to make it always behave
	correctly now it will be correct 99 % of time instead of
      almost never correct, at least on unix-based platforms.</p>
      <p>
      Own Id: OTP-7685 Aux Id: seq11082 </p>
    </item>
    <item>
      <p>
	[sftpd] - Added patch to further improve handling of
      symbolic links in the sftp-server.</p>
      <p>
      Own Id: OTP-7766 Aux Id: seq11101 </p>
    </item>
    <item>
      <p>
	Ssh incorrectly sent the local id instead of the remote
	id of a channel to the peer. For simpler cases these ids
	often happen to have the same value. One case when they
	do not is when the client sends an exec command two times
	in a raw on the same ssh connection (different channels
	of course as the channel will be closed when the exec
      command has been evaluated) .</p>
      <p>
      Own Id: OTP-7767</p>
    </item>
    <item>
      <p>
	Packet data could be lost under high load due to the fact
	that buffered data was sometimes wrongly discarded before
      it had been sent.</p>
      <p>
      Own Id: OTP-7768</p>
    </item>
    <item>
      <p>
	Improved ipv6-handling as some assumptions about inet
      functions where incorrect.</p>
      <p>
      Own Id: OTP-7770</p>
    </item>
  </list>
  </section>

  
  <section><title>Improvements and New Features</title>
  <list>
    <item>
      <p>
      Added new API function ssh:connection_info/2.</p>
      <p>
      Own Id: OTP-7456</p>
    </item>
    <item>
      <p>
	Now starts ssh channel processes later avoiding
      synchronization problems between processes.</p>
      <p>
      Own Id: OTP-7516</p>
    </item>
    <item>
      <p>
	Ssh now rejects old versions of the ssh protocol for
	security reasons. (Even if they where not correctly
	rejected before the connection would probably have failed
      anyway due to other reasons.)</p>
      <p>
      Own Id: OTP-7645 Aux Id: seq11094 </p>
    </item>
    <item>
      <p>
	New API module ssh_channel has been added. This is a
	behaviour to facilitate the implementation of ssh clients
	and plug in subsystems to the ssh daemon. Note that this
	slightly changes the options to the API function
	ssh:daemon/[1,2,3] deprecating all no longer documented
	options. Note that the new API enforces the "logical way"
	of using the old API e.i. making the subsystem process
	part of the ssh applications supervisor tree, so missuses
      of the old API are not compatible with the new API.</p>
      <p>
      *** POTENTIAL INCOMPATIBILITY ***</p>
      <p>
      Own Id: OTP-7769</p>
    </item>
  </list>
  </section>

  <section><title>Known Bugs and Problems</title>
  <list>
    <item>
      <p>
	Public keys protected by a password are currently not
      handled by the erlang ssh application.</p>
      <p>
      Own Id: OTP-6400 Aux Id: 10595 </p>
    </item>
  </list>
  </section>
  
  </section>
    
    <section><title>Ssh 1.0.2</title>
    
    <section><title>Fixed Bugs and Malfunctions</title>
    <list>
      <item>
	<p>
	  [sftpd] - Listing of symbolic link directories should now
	  work as expected.</p>
	  <p>
	  Own Id: OTP-7141 Aux Id: seq10856 </p>
        </item>
    </list>
    </section>
    
    </section>
    
   <section><title>Ssh 1.0.1</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            [sftp] - When listing a directory with more than 100
            files only the first 100 where listed. This has now been
            fixed.</p>
          <p>
            Own Id: OTP-7318 Aux Id: seq10953 </p>
        </item>
        <item>
          <p>
            When restarting an ssh-system the expected return value
            from ssh_system_sup:restart_acceptor/2 was incorrect,
            this is no longer the case.</p>
          <p>
            Own Id: OTP-7564 Aux Id: seq11055 </p>
        </item>
        <item>
          <p>
            A few minor bugs where fixed in ssh_userreg.erl and
            ssh_connection_manager and a a ssh_cli option was added
            to restore backwards compatibility with the old ssh_cm -
            API.</p>
          <p>
            Own Id: OTP-7565</p>
        </item>
        <item>
          <p>
            Fixed bug in ipv6 support and added option to disable
            ipv6 as a workaround for badly configured computers.</p>
          <p>
            Own Id: OTP-7566</p>
        </item>
      </list>
    </section>

    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            [sftp] - Option added to set timeout value in sftp.</p>
          <p>
            Own Id: OTP-7305 Aux Id: seq10945 </p>
        </item>
      </list>
    </section>

   </section>

  <section><title>Ssh 1.0</title>

    <section><title>Fixed Bugs and Malfunctions</title>
      <list>
        <item>
          <p>
            Removed some special handling of prompts that made ssh
            behave differently than openssh.</p>
          <p>
            Own Id: OTP-7485 Aux Id: seq11025 </p>
        </item>
        <item>
          <p>
            Bug in encoding of pty opts has been fixed.</p>
          <p>
            Own Id: OTP-7504</p>
        </item>
      </list>
    </section>


    <section><title>Improvements and New Features</title>
      <list>
        <item>
          <p>
            The architecture of the ssh processes has been
            reconstructed to fit in a supervision tree as to become a
            real OTP application and benefit from this when starting
            and stopping.</p>
          <p>
            Own Id: OTP-7356 Aux Id: seq10899 </p>
        </item>
        <item>
          <p>
            Support for pty option echo off added. Requires kernel
            from R12B-4.</p>
          <p>
            *** POTENTIAL INCOMPATIBILITY ***</p>
          <p>
            Own Id: OTP-7502 Aux Id: seq10959 </p>
        </item>
        <item>
          <p>
            The ssh API has been enhanced a lot of old API functions
            has become deprecated.</p>
          <p>
            Own Id: OTP-7503</p>
        </item>
      </list>
    </section>

  </section>
</chapter>