PN84688: LOGIN TO OE TELNET FAILS FROM A WORK STATION (EG: SUN RUNNING SUNOS 5.5) THAT SENDS NEW-ENVIRONMENT SUBOPTIONS

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• When attempting to login to OE Telnet from a Sun work station
  running at the SunOS 5.5 level the following messages are
  displayed at the work station:
    TELNET HOST(MAINT1) 923
    Trying 'their ip address'
    Connected to MAINT1
    Escape char is 'right bracket'
    PLn   (and it stops here)
   The error occurs when Telnet is processing the NEW-ENVIRONMENT
  suboption.  Telnet sends an invalid character string,
  x'7f504c7f6e' (or ascii 'PLn', the 7f is a DEL character) which
  the Sun work station displays.  There is no further communica-
  tion.
   The sniffer trace shows the following negotiation sequences:
  To the work station:
  IAC DO TTYPE IAC DO TSPEED IAC DO XDISPLAY IAC DO NEW_ENVIRON
  IAC DO OLD-ENVIRON IAC WILL ECHO
  x'fffd18fffd20fffd23fffd27fffd24fffb01'
  From the work station:
  IAC WILL TTYPE IAC WILL TSPEED IAC WILL XDISPLAY IAC WILL
  NEW_ENVIRON IAC WONT OLD_ENVIRON IAC DO ECHO
  x'fffb18fffb20fffb23fffb27fffc24fffd01'
  To the work station:
  IAC SB TSPEED SEND IAC SE
  IAC SB XDISPLAY SEND IAC SE
  IAC SB NEW-ENVIRON SEND IAC SE
  IAC SB TTYPE SEND IAC SE
  x'fffa2001fff0fffa2301fff0fffa2701fff0fffa1801fff0'
  From the work station:
  IAC SB TSPEED IS 9600,9600 IAC SE
  IAC SB XDISPLAY IS sun098:0.0 IAC SE
  IAC NEW-ENVIRON IS VAR DISPLAY VALUE sun098:0.0 IAC SE
  IAC SB TTYPE IS XTERM
  To the work station:
  x'7f504c7f6e'
   The telnet trace reflects the contents of the sniffer trace
  until the processing of the NEW-ENVIRON suboption.  The display
  of the contents of NEW-ENVIRON suboption is:
  EZYTU17I UTILITY: receive suboption
   NEW-ENVIRON
   IS
  VAR
  104
  111
  123
  " 101
  131
  VALUE
  163
  165
  " 060
  071
  070
  072
  060
  056
  060
  whereas it should be:
  EZYTU17I UTILITY: receive suboption
   NEW-ENVIRON
   IS
  VAR
  DISPLAY
  VALUE
  sun098:0.0
  Subsequent to the above messages the telnet trace shows the
  sending of the invalid character string:
  EZYTS17I Defer suboption negotiation
  EZYTU14I UTILITY: netwrite 5  chars.
  EZYTU21I Ont: 7f504c7f6e "&<">
   RFC1572 describes the requirements for processing the
  NEW-ENVIRONMENT suboption.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All OE telnet users whose client sends       *
  *                 in WILL ENVIRONMENT and/or WILL TSPEED       *
  *                 suboptions.                                  *
  ****************************************************************
  * PROBLEM DESCRIPTION: When attempting to login to OE Telnet   *
  *                      from a Sun work station running at the  *
  *                      SunOS 5.5 level (or any client sending  *
  *                      ENVIRONMENT or TSPEED suboptions),      *
  *                      the following messages are displayed    *
  *                      at the work station:                    *
  *                                                              *
  *                        TELNET HOST(MAINT1) 923               *
  *                        Trying 'their ip address'             *
  *                        Connected to MAINT1                   *
  *                        Escape char is 'right bracket'        *
  *                        PLn   (and it stops here)             *
  *                                                              *
  *                      The first error occurs when Telnet is   *
  *                      processing the NEW-ENVIRONMENT          *
  *                      suboption.  Telnet sends an invalid     *
  *                      character string, x'7f504c7f6e'(or      *
  *                      ascii 'PLn', the 7f is a DEL character) *
  *                      which the Sun work station displays.    *
  *                      Then there is no further communication  *
  *                      and the SUN client hangs.               *
  *                                                              *
  *                      NOTE: Most clients send WILL            *
  *                      ENVIRONMENT (NEW / OLD) suboptions if   *
  *                      certain environment variables (e.g.     *
  *                      DISPLAY) are set.  SUN/OS 5.5           *
  *                      (SOLARIS 2.5) clients send WILL TSPEED. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The first error, dealing with environment processing was
  module EZATNUTI was not converting all the ENVIRONMENT suboption
  data to EBCDIC prior to trying to determine if it was a
  printable character.  Also, the converted data was being placed
  in *nfrontp which is the terminal output buffer, causing the
  EBCDIC data to be written to the client.  These errors are
  in the printsub() routine.  Also, store_log was not clearing
  out or inserting a null ('\0') in the output buffer that is
  sent to syslog.
  
  The second error was caused by EZATNSTA (suboption()) deferring
  the TSPEED processing but not resetting the tspeedsubopt switch
  to indicate that the client had sent in his tspeed information.
  Even though we are deferring the processing until the second
  pass, the switch must be set so we don't wait for the client
  causing a hang.
  

Problem conclusion

• Module EZATNUTI has been changed to correctly handle ENVIRONMENT
  (NEW or OLD) suboption processing correctly.  Module EZATNSTA
  (suboption()) has been changed to set the switch indicating we
  have received the clients tspeed information.
  

Temporary fix

Comments

• ×**** PE96/09/25 FIX IN ERROR. SEE APAR PN85607  FOR DESCRIPTION
  

APAR Information

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

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

  118PC4Ÿ UN94774 118PC4Ÿ 116AC4Ÿ PN88995

Modules/Macros

• EZATNSTA EZATNTEL EZATNUTI
  

Fix information

• Fixed component name

  TCP/IP V3 MVS

• Fixed component ID

  5655HAL00

Applicable component levels

• R317 PSY UN94774

     UP96/09/11 P F609

Fix is available

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