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File Formats                                    ftpconversions(4)

     ftpconversions - FTP Server conversions database


     When the FTP  Server,  in.ftpd(1M),  receives  the  retrieve
     (RETR)  command,  if  the  specified file does not exist, it
     looks for a conversion to change an existing file or  direc-
     tory  of  the same base name into the format requested, sub-
     ject to the ftpaccess(4) compress and tar capabilities.

     The conversions  and their attributes known  by  in.ftpd(1M)
     are  stored  in  an ASCII file of the following format. Each
     line in the file provides a description for a single conver-
     sion. The fields in this file are separated by colons (:).

      1  2  3  4  5  6  7  8

     The fields are described as follows:

     1     Strip prefix.

     2     Strip postfix.

     3     Addon prefix.

     4     Addon postfix.

     5     External command.

     6     Types.

     7     Options.

     8     Description.

     The Strip prefix and Addon prefix fields are  not  currently

     The Strip postfix and addon postfix fields are extensions to
     be  added  to  or  removed  from  the  requested filename in
     attempting to produce the name of an existing file or direc-
     tory.  When  the  attempt  succeeds, the FTP Server runs the
     external command associated with the conversion.  The  magic
     cookie %s in the argument is passed to the command, replaced
     with the name of the existing file or directory.

     External command is the absolute pathname of  a  command  to
     run  followed  by  the  appropriate options to carry out the

SunOS 5.9           Last change: 16 Oct 2001                    1

File Formats                                    ftpconversions(4)

     conversion. The standard output of the command is sent  back
     in  response  to  the RETR (retrieve) command. For anonymous
     and guest users to be able to execute the command,  it  must
     be present in their chroot'd hierarchy along with any neces-
     sary dynamic libraries.

     Types specifies the conversion type.  The  following  values
     are recognized:

           ASCII transfers are allowed of a file produced by  the

     T_DIR Directories can be converted.

     T_REG Regular files can be converted.

     Options are checked against the  ftpaccess(4)  compress  and
     tar capabilities and are recorded in the special-action-flag
     field that is written to the FTP Server logfile.  See  xfer-
     log(4). The following options are supported:

           conversion compresses

     O_TAR conversion archives

           conversion uncompresses

     You can specify  more  than  one  option  by  using  "|"  to
     separate  options.  For  example, O_TAR|O_COMPRESS specifies
     that the conversion archives and compresses.

      Description is a one word  description  of  the  conversion
     that is used in error messages returned to the FTP client.

     Lines that begin with a # sign are treated as comment  lines
     and are ignored.

     Example 1: Compressing a Regular File for Transfer

     The following example specifies a conversion which generates
     filename.Z  by  compressing  an  existing file filename. The
     conversion can only be applied to regular files, not  direc-
     tories,  and  the  absence of T_ASCII prevents the resulting
     file from being transferred in ASCII mode.

     : : :.Z:/usr/bin/compress -c %s:T_REG:O_COMPRESS:COMPRESS

SunOS 5.9           Last change: 16 Oct 2001                    2

File Formats                                    ftpconversions(4)

     Example 2:  Uncompressing and Transferring in ASCII Mode

     The following example  specifies  a  conversion  that  takes
     filename.Z  and  uncompresses  it to produce filename, which
     then can be transferred in ASCII mode.

     :.Z: : :/usr/bin/compress -cd %s:T_REG|T_ASCII:O_UNCOMPRESS:UNCOMPRESS


     See attributes(5)  for descriptions of the following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Availability                | SUNWftpr                    |

     ldd(1), in.ftpd(1M), ftpaccess(4), xferlog(4), attributes(5)

SunOS 5.9           Last change: 16 Oct 2001                    3