ftpconversions(4)
NAME
ftpconversions - FTP Server conversions database
SYNOPSIS
/etc/ftpd/ftpconversions
DESCRIPTION
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 (:).
%s:%s:%s:%s:%s:%s:%s:%s
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
supported.
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
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:
T_ASCII
ASCII transfers are allowed of a file produced by the
conversion.
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:
O_COMPRESS
conversion compresses
O_TAR conversion archives
O_UNCOMPRESS
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.
EXAMPLES
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
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
FILES
/etc/ftpd/ftpconversions
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | SUNWftpr |
|_____________________________|_____________________________|
SEE ALSO
ldd(1), in.ftpd(1M), ftpaccess(4), xferlog(4), attributes(5)
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