curl/docs/TODO

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TODO
Things to do in project cURL. Please tell us what you think, contribute and
send us patches that improve things! Also check the http://curl.haxx.se/dev
web section for various technical development notes.
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All bugs documented in the KNOWN_BUGS document are subject for fixing!
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LIBCURL
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* Introduce an interface to libcurl that allows applications to easier get to
know what cookies that are received. Pushing interface that calls a
callback on each received cookie? Querying interface that asks about
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existing cookies? We probably need both. Enable applications to modify
existing cookies as well. http://curl.haxx.se/dev/COOKIES
* Introduce another callback interface for upload/download that makes one
less copy of data and thus a faster operation.
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[http://curl.haxx.se/dev/no_copy_callbacks.txt]
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* More data sharing. curl_share_* functions already exist and work, and they
can be extended to share more.
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* Set the SO_KEEPALIVE socket option to make libcurl notice and disconnect
very long time idle connections.
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* Go through the code and verify that libcurl deals with big files >2GB and
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>4GB all over. Bug reports (and source reviews) show that it doesn't
currently work.
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* CURLOPT_MAXFILESIZE. Prevent downloads that are larger than the specified
size. CURLE_FILESIZE_EXCEEDED would then be returned. Gautam Mani
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requested. That is, the download should not even begin but be aborted
immediately.
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LIBCURL - multi interface
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* Add curl_multi_timeout() to make libcurl's ares-functionality better.
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* Make sure we don't ever loop because of non-blocking sockets return
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EWOULDBLOCK or similar. This FTP command sending, the SSL connection etc.
* Make transfers treated more carefully. We need a way to tell libcurl we
have data to write, as the current system expects us to upload data each
time the socket is writable and there is no way to say that we want to
upload data soon just not right now, without that aborting the upload. The
opposite situation should be possible as well, that we tell libcurl we're
ready to accept read data. Today libcurl feeds the data as soon as it is
available for reading, no matter what.
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DOCUMENTATION
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* More and better
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FTP
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* Support the most common FTP proxies, Philip Newton provided a list
allegedly from ncftp:
http://curl.haxx.se/mail/archive-2003-04/0126.html
* Make CURLOPT_FTPPORT support an additional port number on the IP/if/name,
like "blabla:[port]" or possibly even "blabla:[portfirst]-[portsecond]".
* FTP ASCII transfers do not follow RFC959. They don't convert the data
accordingly.
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* Since USERPWD always override the user and password specified in URLs, we
might need another way to specify user+password for anonymous ftp logins.
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* Add FTPS support with SSL for the data connection too. This should be made
according to the specs written in draft-murray-auth-ftp-ssl-11.txt,
"Securing FTP with TLS", valid until September 27th 2003.
http://curl.haxx.se/rfc/draft-murray-auth-ftp-ssl-11.txt
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HTTP
* Digest, NTLM and GSS-Negotiate support for HTTP proxies. They all work
on direct-connections to the server.
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* Pipelining. Sending multiple requests before the previous one(s) are done.
This could possibly be implemented using the multi interface to queue
requests and the response data.
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TELNET
* Make TELNET work on windows98!
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* Reading input (to send to the remote server) on stdin is a crappy solution
for library purposes. We need to invent a good way for the application to
be able to provide the data to send.
* Move the telnet support's network select() loop go away and merge the code
into the main transfer loop. Until this is done, the multi interface won't
work for telnet.
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SSL
* If you really want to improve the SSL situation, you should probably have a
look at SSL cafile loading as well - quick traces look to me like these are
done on every request as well, when they should only be necessary once per
ssl context (or once per handle). Even better would be to support the SSL
CAdir option - instead of loading all of the root CA certs for every
request, this option allows you to only read the CA chain that is actually
required (into the cache)...
* Add an interface to libcurl that enables "session IDs" to get
exported/imported. Cris Bailiff said: "OpenSSL has functions which can
serialise the current SSL state to a buffer of your choice, and
recover/reset the state from such a buffer at a later date - this is used
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by mod_ssl for apache to implement and SSL session ID cache". This whole
idea might become moot if we enable the 'data sharing' as mentioned in the
LIBCURL label above.
* OpenSSL supports a callback for customised verification of the peer
certificate, but this doesn't seem to be exposed in the libcurl APIs. Could
it be? There's so much that could be done if it were! (brought by Chris
Clark)
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* Make curl's SSL layer option capable of using other free SSL libraries.
Such as the Mozilla Security Services
(http://www.mozilla.org/projects/security/pki/nss/) and GNUTLS
(http://gnutls.hellug.gr/)
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LDAP
* Look over the implementation. The looping will have to "go away" from the
lib/ldap.c source file and get moved to the main network code so that the
multi interface and friends will work for LDAP as well.
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CLIENT
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* Add an option that prevents cURL from overwiting existing local files. When
used, and there already is an existing file with the target file name
(either -O or -o), a number should be appended (and increased if already
existing). So that index.html becomes first index.html.1 and then
index.html.2 etc. Jeff Pohlmeyer suggested.
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* "curl ftp://site.com/*.txt"
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* Several URLs can be specified to get downloaded. We should be able to use
the same syntax to specify several files to get uploaded (using the same
persistant connection), using -T.
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* When the multi interface has been implemented and proved to work, the
client could be told to use maximum N simultaneous transfers and then just
make sure that happens. It should of course not make more than one
connection to the same remote host.
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* Extending the capabilities of the multipart formposting. How about leaving
the ';type=foo' syntax as it is and adding an extra tag (headers) which
works like this: curl -F "coolfiles=@fil1.txt;headers=@fil1.hdr" where
fil1.hdr contains extra headers like
Content-Type: text/plain; charset=KOI8-R"
Content-Transfer-Encoding: base64
X-User-Comment: Please don't use browser specific HTML code
which should overwrite the program reasonable defaults (plain/text,
8bit...) (Idea brough to us by kromJx)
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TEST SUITE
* If perl wasn't found by the configure script, don't attempt to run the
tests but explain something nice why it doesn't.
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* Extend the test suite to include more protocols. The telnet could just do
ftp or http operations (for which we have test servers).
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* Make the test suite work on more platforms. OpenBSD and Mac OS. Remove
fork()s and it should become even more portable.
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* Introduce a test suite that tests libcurl better and more explicitly.
NEXT MAJOR RELEASE
* curl_easy_cleanup() returns void, but curl_multi_cleanup() returns a
CURLMcode. These should be changed to be the same.
* curl_formparse() should be removed