Hi Daniel,

The implementation of FTP third party transfer was finished.
I worked on curl-7.12.0-20040519.
The changed files in the attached tar file:
lib/urldata.h
lib/url.c
lib/transfer.c
lib/ftp.c
lib/sendf.h
lib/sendf.c
lib/http.c
include/curl/curl.h

An example: ftpproxy.c

To operate the example, both FTP daemons (ftpd) on remote hosts should
support third party transfer. For example, on HP ftpd should be started
with option "-P" (refer to the manual).

New supported options:
CURLOPT_FTP_SOURCE_HOST
CURLOPT_FTP_SOURCE_PORT
CURLOPT_FTP_SOURCE_USERPWD
CURLOPT_FTP_SOURCE_PATH
CURLOPT_SOURCE_PREQUOTE
CURLOPT_SOURCE_POSTQUOTE

The definition of source host indicates third party transfer. The
appropriate regular options used for a target host. All the changes
remarked with my name to simplify differences searching. The new code is
backward compatible - there is no influence on the regular flow.

Thanks,
Alexander

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