PH66109: Z/VM 7.4 TCP/IP: FIX PACK - FEATURE 00 FIX 01

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• This is the APAR for z/VM 7.4 TCP/IP Fix Pack 1.
  
  It contains fixes for the following two problems:
  
  Problem 1:
  z/VM FTP CLIENT HANGS WHEN TRANSFERRING OPEN FILE
  
  When the z/VM FTP client transfers an already open
  file to a z/OS FTP server, the transfer hangs.
  The z/OS FTP server sends two 125 responses
  followed by a 450 that is never seen by the FTP
  client, but is visible to the SSL server. The fix
  updates TcpStatus to check the relevant TCB for
  bytes that are in the SSL server but have not yet
  reached the TCP/IP stack.
  
  -----
  
  Problem 2:
  z/VM FTP CLIENT FAILS ON MKDIR WITH SPACES
  
  There is an issue with the FTP client where the
  mkdir command fails when attempting to create a
  directory name that contains spaces. When issuing
  a mkdir new directory, the client does not
  create the directory and returns an error message:
  Usage: MKDIR directory.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/VM TCP/IP and the z/VM FTP    *
  *                 client.                                      *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  ****************************************************************
  * RECOMMENDATION: APPLY PTF                                    *
  ****************************************************************
  Problem 1:
  z/VM FTP CLIENT HANGS WHEN TRANSFERRING OPEN FILE
  
  Currently when the FTP client connects to a z/OS server
  and a file being transferred is using PUT, if that    ,
  file is opened on z/OS, 2 125 responses are returned
  followed by a 450. That 450 isn't seen by the FTP
  client and the client hangs, but it is seen in the
  SSL server. The fix updates TcpStatus/Tcp6Status to
  check the relevant TCB for bytes that are in the SSL
  server but not yet in the stack.
  
  -----
  
  Problem 2:
  z/VM FTP CLIENT FAILS ON MKDIR WITH SPACES
  
  'MKDIR' and 'RMDIR' FTP client commands do not
  accept quoted arguments embedding spaces
  between words. When a directory entry must be
  created or deleted, on an FTP server where
  spaces in a directory name is supported, an
  error would be returned.
  

Problem conclusion

• Problem 1:
  z/VM FTP CLIENT HANGS WHEN TRANSFERRING OPEN FILE
  
  A reference to the TCB that contains the bytes that have
  not yet reached a client was added. A check was added
  to TcpStatus/Tcp6Status that checks if this TCB contains
  any bytes, and if so adds this byte count to the
  BytesToRead field. Another check was added to the FTP
  client if the 125 is received from an FTP server, a
  Tcp6Status call is made to check if there are currently
  outstanding BytesToRead.
  
  Problem 2:
  z/VM FTP CLIENT FAILS ON MKDIR WITH SPACES
  
  Fix made in FTP client parser code, so that commands
  "MKDIR" and "RMDIR" interpret arguments containing spaces
  correctly.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UO02862

Modules/Macros

• CMNETST  FTMAIN   FTPARSE  FTPROCS  FTSYPRO  FTUSER   FTUTIL
  TCBASTY  TCMIB    TCMON    TCPIP    TCPREQU  TCPSSL   TCPUP
  TCQUEUE  TCTCB    TCUTIL   TCVMVER  T6PSSL   7VMTCP40
  

Fix information

• Fixed component name

  TCP/IP FOR Z/VM

• Fixed component ID

  5735FAL00

Applicable component levels

• R740 PSY UO02862

     UP25/04/21 P 2502

Fix is available

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